The present invention, at the time of collision of the vehicle and the object, to the end structure of the vehicle to prevent the object slips under the vehicle.
BACKGROUND
[0002]
　For example, if the passenger cars and heavy vehicles such as trucks, such as a head-on collision or a rear-end collision, the difference in installation height of the strength member, such as a cross member provided on another of the vehicle, possibly passenger submerges under large vehicles is there. Therefore, conventionally, the front and rear of large vehicles, passenger cars placed underrun protector in accordance with the installation height of the strength member provided is provided. The underrun protector is an example of the end structure of the vehicle. In addition, the underrun protector, the front underrun protector provided at the front of the vehicle (Front Underrun Protector: FUP), and the vehicle rear underrun protector provided at the rear (Rear Underrun Protector: RUP) are present.
[0003]
　Such underrun protector prevents the slip of the large vehicle passenger, and it is required to exhibit the impact energy absorbing effect by the crushable zone provided on the front or rear of the passenger car. For this reason, the underrun protector, than the effect of absorbing the collision energy generated when the collision with a passenger car, load-bearing performance is required to produce a reaction force to flick a passenger car collided with heavy-duty vehicles.
[0004]
　For example, it discloses a technique relating underrun protector in Patent Documents 1-3. These underrun protector, the beam extending in the vehicle width direction has a fastening structure to the body frame via a bracket or stay (support).
[0005]
　In addition, the underrun protector disclosed in Patent Document 4, in a plan view, and a frame attaching portion attached to the body frame, the beam mounting surface to be attached to the beam so as to bridge between the (main mounting portion) reinforcing member is provided. As a result, the improvement of the load-bearing performance is achieved.
CITATION
Patent Document
[0006]
Patent Document 1: JP 2005-88740 JP
Patent Document 2: JP 2005-225325 Patent Publication
Patent Document 3: JP 2005-225326 Patent Publication
Patent Document 4: JP 2004-243984 JP
Summary of the Invention
Problems that the Invention is to Solve
[0007]
　As a method for evaluating the load carrying capacity at a position in the vehicle width direction outer side from the mounting position or the mounting position of the beam at the stay, when a load is applied to the impact surface of the beam (the surface on which another vehicle collides), up to how much load there is a method to evaluate whether it is possible input. Performance as a product of the underrun protector, depends on the relative merits of the load-bearing performance. Therefore, the maximum input load in the load bearing evaluation test in any of the collision position is desired to develop a further larger such underrun protectors than before.
[0008]
　The present invention has been made in view of the above problems, it is an object of the present invention has been made in view of the above circumstances, which can improve the load carrying capacity for the collision, to provide a new and improved end structure of the vehicle.
Means for Solving the Problems
[0009]
　In order to solve the above problems, according to an aspect of the present invention, it comprises a beam extending in the vehicle width direction, and the connecting structure for connecting the beam to the body frame, and the beam is perpendicular to the vehicle width direction a in a cross-sectional view, a first top portion and a first lower surface portion opposing the first side surface portion connecting one end of said first upper surface portion and the first lower surface portion, said first top in parts and the other end of said first lower surface portion, anda respective first flange portion formed to protrude vertically outwardly, provided in the connection structure, out of the beam projecting the projecting portion disposed inwardly and the first upper surface portion and the first lower surface portion of the beam toward or beam mounting member and the first flange provided on the connecting structure the parts by bonding at least one The beam is fixed to the connection structure, the end structure of the vehicle is provided.
[0010]
　If the protrusion is provided in the connection structure, the above-mentioned protruding portion may be protruded side portion opposite to the first side surface portion can be formed.
[0011]
　Beam mounting member is provided in the connection structure, the case where the beam attachment member is fixed to the first flange portion, the beam attachment member in perpendicular cross section in the vehicle width direction, a second opposing of the upper surface portion and a second lower surface portion, the second side surface portion connecting the second upper surface portion and one end of the second bottom surface portion, of the second upper surface portion and the second lower surface portion at the other end, and a second flange portion formed so as to protrude vertically outwardly, the a first flange portion and the second flange portion may be fixed.
[0012]
　The second side surface portion may be located on the interior side of the vehicle longitudinal direction with respect to the first flange portion.
[0013]
　The beam mounting member is provided in the connection structure, the case where the beam attachment member is fixed to the first flange portion, a region in the vehicle width direction opposed to at least the connecting structure of the opening of the beam first reinforcing member is provided, closed section may be formed by the beam and the first reinforcing member in a perpendicular cross section in the vehicle width direction.
[0014]
　Said first reinforcing member, in the vertical cross section in the vehicle width direction, and a first reinforcing member upper surface portion and the first reinforcing member lower surface portion opposing said first reinforcement member upper surface portion and the first and a first reinforcing member side portions for connecting one end of the reinforcement member lower surface portion, the first reinforcing member is disposed inwardly of the beam, the first top portion and said first reinforcement member and the upper surface portion is fixed, said a first lower surface portion and said first reinforcement member lower surface portion may be fixed.
[0015]
　To the first reinforcement member side portion may be convex portion projecting inside the vehicle in the vehicle longitudinal direction is formed with respect to the first flange portion.
[0016]
　At least a portion of said first reinforcing member side portion may be in contact with the connecting structure.
[0017]
　A second reinforcing member provided in a region facing at least the beam attachment member of the opening of the beam, the second reinforcing member, in the vertical cross section in the vehicle width direction, a second opposing a reinforcing member upper surface portion and the second reinforcing member lower surface portion, and a second reinforcing member side portion for connecting one end of the second reinforcing member upper surface portion and the second reinforcing member lower surface portion, the second reinforcing member upper surface portion and at the other end of said second reinforcing member lower surface portion, and a second reinforcing member flange portion formed so as to protrude vertically outwardly, the second reinforcing member is the beam of disposed inward, the second reinforcing member flange portion is fixed to the first side surface portion above the second reinforcing member side portion may be in contact with the beam mounting member.
[0018]
　The beam mounting member is provided in the connection structure, the case where the beam attachment member is fixed to the first flange portion, the connecting structure is provided to extend in the vertical direction structural body portion further comprising a said beam attachment member, said beam is mounted, and the beam mounting surface having a bent portion which is bent toward the interior side of the vehicle longitudinal direction to the end portion in the vehicle width direction outer side, the beam mounted in a plan view surface to have a perpendicular plane, it has a main body connecting surface attached to the structural body portion in plan view, at least as to bridge between the structural body portion and the beam mounting surface 1 One of the third reinforcing member may be further provided.
[0019]
　The radius of curvature of the bent portion may be 50 ~ 200 mm.
[0020]
　Vehicle longitudinal direction length L of the third reinforcing member 1 and the vehicle front-rear direction length L of the third reinforcing member mounted surface of the structural body portion 2 ratio L of 1 / L 2 is as it will be 0.8 or more, may be the third reinforcing members are provided.
[0021]
　The structural body portion has a U-shaped cross section having an opening provided in the vehicle width direction in a plan view, closed the horizontal cross section a closed section by the structural body portion and the main body connecting surface cross section may be further provided.
[0022]
　In the case where the third reinforcing members are provided more in the vertical direction, the inside of the closed sectional, of the distal end of the third reinforcing member, in accordance with the position of the rear-side tip portion of the vehicle front-rear direction It placed a reinforcing plate is provided, the reinforcing plate, the first located uppermost from the rear side distal end portion of the plurality of the third the third reinforcing member located at the bottom side of the reinforcing member 3 of the reinforcing member may have a shape as to extend to the rear side tip.
[0023]
　In the horizontal cross section of the closed cross-section portion, partition member is provided so as to fill the inner space of the closed cross-section portion, the partition member is combined to at least one of installation height of the third reinforcing member it may be arranged Te.
[0024]
　End structure of the vehicle may be a underrun protector.
[0025]
　In order to solve the above problems, according to another aspect of the present invention, it comprises a beam extending in the vehicle width direction, and a connection structure for connecting the beam and the body frame, the connecting structure, vertical comprising a structural body portion provided so as to extend in a direction, a beam mounting member in which the beam is mounted, and the beam mounting member, said beam is mounted, the vehicle longitudinal direction to the end portion in the vehicle width direction outer side a beam mounting surface having a bent portion which is bent toward the interior side of having a plane perpendicular to the beam mounting surface in a plan view, has a main body connecting surface attached to the structural body portion, a plane in view of at least one reinforcing member so as to bridge between the structural body portion and the beam mounting surface is further provided, the end structure of the vehicle is provided.
The invention's effect
[0026]
　According to the present invention described above, it is possible to improve the load carrying capacity for the collision.
BRIEF DESCRIPTION OF THE DRAWINGS
[0027]
FIG. 1 is a schematic view of the underrun protector according to an embodiment of the present invention.
Is a diagram for explaining the input position of the load applied to the load bearing evaluation method of [2] underrun protector.
3 is a sectional view showing a schematic structure of an example of a conventional underrun protector.
It is a perspective view showing a schematic configuration of underrun protector according to the first embodiment of FIG. 4 the present invention.
[Figure 5] underrun protector according to the embodiment, a sectional view taken along the V-V section line of FIG 4.
6 is a sectional view showing a schematic configuration of a first modification of the underrun protector according to the embodiment.
7 is a sectional view showing a schematic configuration of a second modification of the underrun protector according to the embodiment.
8 is a perspective view showing a schematic configuration of underrun protector according to a second embodiment of the present invention.
[9] underrun protector according to the embodiment, a sectional view taken along IX-IX cut line shown in FIG.
FIG. 10 is a longitudinal sectional view showing the shape of the first reinforcing member underrun protector according to the embodiment.
11 is a sectional view showing a schematic configuration of a first modification of the underrun protector according to the embodiment.
It is a sectional view showing a schematic configuration of a second modification of the underrun protector according to [12] the same embodiment.
13 is a perspective view showing a schematic configuration of a third modification of the underrun protector according to the embodiment.
[Figure 14] underrun protector according to the embodiment, a sectional view taken along XIV-XIV section line shown in FIG. 13.
It is a sectional view showing a schematic configuration of a fourth modification of the underrun protector according to [15] the same embodiment.
16 is a perspective view showing a schematic configuration of a fifth modification of the underrun protector according to the embodiment.
[Figure 17] underrun protector according to the embodiment, a sectional view taken along XVII-XVII cutting line shown in FIG. 16.
18 is a sixth cross-sectional view showing a schematic configuration of a modification of the underrun protector according to the embodiment.
19 is a sectional view showing a schematic structure of an example of a conventional underrun protector comprising a reinforcing member.
FIG. 20 is a seventh perspective view showing a schematic configuration of a modification of the underrun protector according to the embodiment.
[Figure 21] underrun protector according to the embodiment, a sectional view taken along XXI-XXI cutting line shown in FIG. 20.
22 is a sectional view showing a schematic configuration of the eighth modification of the underrun protector according to the embodiment.
It is a diagram showing an example of deformation state of underrun protector [23] When the load to conventional underrun protector is entered.
Is a perspective view showing a schematic configuration of underrun protector according to the third embodiment of FIG. 24 the present invention.
[Figure 25] underrun protector according to the embodiment, a sectional view taken along XXV-XXV section line shown in FIG. 24.
[FIG. 26] is a diagram showing an example of a state of deformation of the underrun protector when the load against underrun protector according to the embodiment is input.
FIG. 27 is a perspective view showing a schematic configuration of a first modification of the underrun protector according to the embodiment.
[FIG. 28] is a diagram showing an example of deformation state of underrun protector when the load against underrun protector according to the modification is entered.
FIG. 29 is a perspective view showing a schematic configuration of a second modification of the underrun protector according to the embodiment.
It is a diagram showing an example of deformation state of underrun protector when the load against underrun protector according to [30] the modification is entered.
[FIG. 31] is a perspective view showing a schematic configuration of a third modification of the underrun protector according to the embodiment.
[FIG. 32] is a perspective view showing a schematic configuration of underrun protector according to a fourth embodiment of the present invention.
[Figure 33] underrun protector according to the embodiment, a sectional view taken along XXXIII-XXXIII cutting line shown in FIG. 32.
[Figure 34] underrun protector according to the embodiment, a cross-sectional view along XXXIV-XXXIV cutting line shown in FIG. 32.
It is a diagram for explaining a test method for load bearing evaluation test for underrun protector according to [35] Experimental Example 1.
[FIG. 36] is a graph showing the relationship between the input load Indentation amount in Example 1 and Comparative Example 1.
It is a diagram for explaining a test method for load bearing evaluation test for underrun protector according to [37] Experimental Example 2.
[FIG. 38] is a graph showing the relationship between the indentation amount and input load in Example 2 and Comparative Example 1.
[39] is a graph showing the relationship between the indentation amount and input load in Example 7 and Comparative Example 3.
[Figure 40] The length L 1 and the vehicle of the reinforcing member mounting surface longitudinal direction length L 2 is a graph showing the ratio of the relationship between the maximum load ratio of the conventional underrun protector.
DESCRIPTION OF THE INVENTION
[0028]
　Hereinafter, with reference to the accompanying drawings, it will be described in detail preferred embodiments of the present invention. In the specification and the drawings, components having substantially the same function and structure are a repeated explanation thereof by referring to the figures.
[0029]
　In the present specification, the term "vehicle longitudinal direction of the exterior", for example, when the end structure of the vehicle is provided on the front of the vehicle means "front side", end structure of the vehicle If it provided in the rear of the vehicle means a "rear side". For "interior side of the vehicle longitudinal direction" means the opposite of "the vehicle longitudinal direction of the exterior." Further, in the present specification, "horizontal" and "vertical" are not "horizontal" and "vertical" in the strict sense, the vertical substantially horizontal and substantially included in the scope of the "horizontal" and "vertical". In addition, "perpendicular" herein does not mean a strict right angle (90 °), a substantially right angle is also included in the scope of the "right-angle".
[0030]
　<< 1. Load bearing Evaluation >> underrun protector
　Figure 1 is a schematic view of the underrun protector according to an embodiment of the present invention. As shown in FIG. 1, the large vehicle V1, underrun protector 1 is provided constituted by a beam 2 and the connecting structure 3. Underrun protector 1 according to this embodiment is an example of the end structure of the vehicle. Underrun protector 1 shown in Figure 1 is provided in the front lower portion of the large vehicle V1, it is attached to the body frame (not shown) via a connecting structure 3. The underrun protector 1, not only in front of the large vehicles V1, is also provided in the rear.
[0031]
　As shown in FIG. 1, generally the bumper 100 is provided in front or rear of the vehicle for large vehicles V1. However, the bumper 100 may be provided at a position higher than the frame 200 of the passenger car V2. Therefore, when the passenger car V2 large vehicles V1 collides, bumper 100 and the frame 200 without colliding from the front, large vehicle V1 will rides on passenger V2. In this case, it is impossible to absorb the impact energy of the frame 200 receives from large vehicles V1, the passenger V2 cabin may deform. For this reason, it is difficult to ensure the safety of passengers on board a passenger car V2.
[0032]
　On the other hand, underrun protector 1 includes, as shown in FIG. 1, is provided in accordance with the height of the same level as the frame 200 of the passenger car V2. Then, a large vehicle V1 and passenger V2 is upon collision with the vehicle longitudinal direction, underrun protector 1 collide with frame 200. Accordingly, the passenger V2 not sink into the lower portion of the large vehicle V1, it is possible to absorb the collision energy frame 200 receives from the large vehicle V1. Therefore, it is possible to secure the safety of passengers aboard the passenger V2.
[0033]
　Such underrun protector, while preventing slip of the passenger V2, it is required to exhibit a collision energy absorbing mechanism having a passenger V2. That is, underrun protector 1, than the effect of absorbing the impact energy generated upon collision with a passenger car V2, load-bearing performance is required for producing a reactive force to flick the passenger V2 colliding with large vehicle V1 . The load-bearing performance, it is required for the beam 2 underrun protector 1 is a high level regardless of the collision position in the vehicle width direction. However, the input position of the load relative to the beam 2, the deformation mode occurring during the underrun protector 1 collisions differ. Therefore, improvement of the load bearing capability of the plurality of deformation modes are required.
[0034]
　Figure 2 is a diagram for explaining the input position of the load applied to the load bearing rating method underrun protector. Referring to Figure 2, a method of evaluating the load bearing performance of the underrun protector (load bearing evaluation method), the vehicle than the mounting position P1 or mounting position P1 of the beam 2 in the connection structure 3 attached to the body frame 20 it is a method of evaluating the maximum input load obtained in response to an input load F with respect to the outer position P2 in the width direction W.
[0035]
　To obtain a sufficient load carrying capacity of the underrun protector, as described above, it is required to correspond to the deformation mode of the beam 2 generated by the input load to the impact location. For example, when a load F with respect to the attachment position P1 is given, the cross section of the beam 2 collapse may occur in the vicinity of the mounting position P1. In order to suppress the cross-section of the beam 2 collapsed in the mounting position P1, it is required to suppress out-of-plane deformation of the beam 2. Further, when a load F is given to the position P2, Slight beam 2 can occur in the vicinity of position P2. To avoid bending of the beam 2 in the vicinity of the position P2, it is required to suppress the bending of the beam 2.
[0036]
　That is, the performance of the product underrun protector, depends on the relative merits of the load bearing performance in the mounting position P1 and the position P2. Therefore, load good and the underrun protector bearing capability, the maximum input load in the installation position P1 and the position P2 is underrun protector is a high level.
[0037]
　The following describes an example of a configuration of a conventional underrun protector. Figure 3 is a sectional view showing a schematic structure of an example of a conventional underrun protector 50. Conventional underrun protector 50, as shown in FIG. 3, comprises a beam 51 and the bracket 52. Bracket 52 is mounted to the vehicle frame (not shown), beam 51 is attached to the bracket 52 such that the exterior in the longitudinal direction of the vehicle.
[0038]
　For such a beam shape, the load F is input to the beam impingement surface, the beam 51 as shown by the broken line in FIG. 3 deformation occurs. In this case, for example, at the position P1 in FIG. 2, the cross-section of the beam 51 collapse occurs. Further, such the deformation occurs at position P2 in FIG. 2, the fastening portion near the beam 51 and the bracket 52, the anti-collision surface and the bracket 52 of the beam 51 deforms to flex inwardly of the beam 51 put away.
[0039]
　When such deformation occurs, the deformation resulting in proceeds with the input load increases. Therefore, significantly smaller than the intensity should have a beam cross-section is inherently. In other words, it was not able to pull out the load-bearing performance of the underrun protector enough.
[0040]
　Accordingly, the present inventors have studied intensively, it invented the underrun protector shown in the description of the following embodiments. Underrun protector shown in this embodiment, it is possible to improve the load carrying capacity than the traditional in any of the collision position. The following describes underrun protector according to each embodiment.
[0041]
　Incidentally, underrun protector in this embodiment is an example of the end structure of the vehicle, the present invention is not limited to such an example. For example, in the railway vehicle, the obstacle deflector for preventing the entrainment of the object such as a passenger car is also an example of the end structure of the vehicle according to the present invention. Although described underrun protector in the present embodiment, the end structure of the vehicle according to the present invention is also applicable to other vehicles and self-propelled machines. Other vehicles and self-propelled machines, for example, two-wheel vehicles, large vehicles such as buses or tractor, trailer, rail vehicles, construction machinery, include mining equipment, agricultural machinery, general machinery, and ships, and the like. Further, the material forming the respective members constituting the end structures of the vehicle according to the present invention, in addition to steel, aluminum, or may be a metal plate of titanium or stainless steel, or the like. The material of the material forming the respective members, alloy, composite material composed of a metal and a resin or a carbon fiber.
[0042]
　<< 2. First Embodiment >>
　FIG. 4 is a perspective view showing a schematic configuration of an example of the underrun protector 1 according to the first embodiment of the present invention. As shown in FIG. 4, underrun protector 1 according to this embodiment includes a beam 2 extends in the vehicle width direction W, and a connecting structure 3 for connecting the beam 2 to the body frame 20. Connection structure 3 according to the present embodiment is, for example, the stay 4. Note that in other embodiments, connection structure 3 may be a bracket that is attached to the stay. The bracket is also an example of the beam mounting member in other embodiments. Such a connection structure 3, at least one of the front or rear of the vehicle, is provided in left and right. Beam 2 is provided so as to bridge the pair of left and right connection structure 3. The material of the material forming such beam 2 is not limited to steel, as described above, various metals, alloys, composite materials composed of a metal and a resin or a carbon fiber. Since the load-bearing performance is required for a beam 2 is preferably formed by a high strength material.
[0043]
　Pair of stays 4 are formed so as to extend in the vertical direction V, it has a portion formed in a U-shape in plan view, and a protrusion 6 protruding toward the inside of the beam 2. Further, a pair of stays 4, the opening surface 4a is to face each other on the inside in the vehicle width direction W, and are spaced apart. Some opening surface 4a of the pair of stays 4, frame mounting plate 5 is provided so as to cover the opening. The frame mounting plate 5 is welded to the stay 4. The frame mounting plate 5 bolt hole 21 is formed. Frame mounting plate 5, through the bolt hole 21, it is bolted to the vehicle body frame 20. Thus, the stay 4 is fixed to the vehicle body frame 20. The connection structures 3 in the present embodiment, a stay 4, constituted by a frame mounting plate 5.
[0044]
　5, the underrun protector 1 according to this embodiment and is a cross-sectional view taken along V-V section line of FIG 4. In FIG. 5, the image of the deformation of each member due to a load input is indicated by a broken line. As shown in FIG. 5, the beam 2 according to the present embodiment, in vertical cross section in the vehicle width direction W, the first upper surface portion 2a and the first lower surface portion 2b opposite the first upper surface portion 2a and having a first side surface portion 2c for connecting one end of the first lower surface portion 2b, and. In the present embodiment, the first upper surface portion 2a and the first lower surface portion 2b are provided so as to be horizontal. The first side surface portion 2c is formed perpendicular to the first upper surface portion 2a and the first lower surface portion 2b, and has a vertical plane. In the other end (one end of the first side side surface portion 2c is not provided) of the first upper surface portion 2a and the first lower surface portion 2b, a pair of outwardly projecting in the vertical direction V first flange portion 2d is provided for. Specifically, each of the first flange portion 2d, protrudes upwardly in the vertical direction V in the other end of the first upper surface portion 2a, in the first lower surface portion 2b protrudes downward in the vertical direction V It is formed so as to. That is, the beam 2 according to the present embodiment, in vertical cross section in the vehicle width direction W, and has a so-called hat shape.
[0045]
　That is, the beam 2 according to the present embodiment, in vertical cross section in the vehicle width direction W, has a so-called hat shape. Further, as shown in FIG. 5, the central portion of the first top portion 2a and the first lower surface portion 2b of beam 2, bolt holes 8 are formed.
[0046]
　Further, as shown in FIGS. 4 and 5, the protruding portion 6 of the stay 4, a protruding upper surface portion 6a formed so as to face the first top portion 2a, so as to face the first lower surface portion 2b and a protruding lower surface portion 6b formed. In this embodiment, the tip of the projecting portion 6 is adjacent to the first side surface portion 2c. Further, a state in which the first upper surface portion 2a and the projection upper surface portion 6a is in contact, and a state where the protruding lower surface portion 6b and the first lower surface portion 2b is in contact. In the central portion of the projecting upper surface 6a and the protruding lower surface portion 6b, bolt holes 7 are formed, respectively. Protrusions 6 are fixed with the first upper surface portion 2a and the first lower surface portion 2b, by a bolt 22 through the bolt holes 7 and bolt holes 8. Thus, the beam 2 is to be attached to the body frame 20 via a stay 4.
[0047]
　Underrun protector 1 according to this embodiment is constructed as described above. According to such a configuration, the projecting portion 6 is disposed inwardly of the beam 2 having an open cross section, and is fixed to the first upper surface portion 2a and the first lower surface portion 2b. Thus, the load F applied by the collision, the projecting portion 6 from the first upper surface portion 2a and the first lower surface portion 2b, is transmitted to the in-plane direction as shear. Then, since the load applied to the first side surface portion 2c of the beam 2 is transmitted to the stay 4 via the first top portion 2a and the first lower surface portion 2b, applied to the first side surface portion 2c bear There is reduced. Therefore, it is possible to suppress the progress of deformation of a local cross-section of the beam 2, also, it is possible to suppress the dispersion of the input load. As a result, can be larger than the maximum load value conventional in load bearing evaluation test, it is possible to improve the load carrying capacity of the underrun protector. That is, it is possible to improve the load carrying capacity for the load to be input to the collision surface of the beam 2 at the installation position P1 of the beam 2 shown in FIG. 2 (exterior surface of the first side surface portion 6c).
[0048]
　The beam 2 in the above embodiment has a pair of first flange portion 2d. On the other hand, the anti-load input terminal of the first upper surface portion 2a and the first lower surface portion 2b near the load input point of the beam 2 is substantially a tensile deformation. Therefore, the beam 2 is that no first flange portion 2d, when the intensity is formed in a low tensile steel high ductility, an end portion at least either the first upper surface portion 2a or the first lower surface portion 2b since fracture occurs, the effect of improving the load bearing performance may be lower than expected. Therefore, by which the first flange portion 2d is formed on the beam 2, it is possible to suppress the end breakage of the.
[0049]
　Having described underrun protector 1 according to this embodiment, the present invention is not limited to such an example. For example, the shape of the stay 4 is not limited to the examples described in the above embodiments. For example, the tip of the projecting portion 6 of the stay 4 is preferably in proximity to the first side surface portion 2c of the beam 2 as described above. However, the position or shape of the inner tip of the beam 2 of the protruding portion 6 may be appropriately changed in accordance with the required load carrying capacity and beam shape.
[0050]
　(First Modification)
　FIG 6 is a sectional view showing a schematic configuration of a first modification of the underrun protector 1 according to this embodiment. As shown in FIG. 6, the projecting side portions 6c may be provided for connecting the front end of the projecting upper surface portion 6a and the projection lower surface portion 6b. In this case, the projecting side portions 6c may be provided in a position in which it contacts the inner surface of the first side surface portion 2c. In this case, when the load is applied, together with the suppression of the deformation of the first side surface portion 2c, suppression of out-of-plane deformation of the protrusion 6 (e.g., out-of-plane deformation of the projecting upper surface portion 6a or projections lower surface portion 6b) It can become. Therefore, it is possible to further improve the load carrying capacity.
[0051]
　(Second Modification)
　The beam 2 in the embodiment described above has been to have a pair of first flange portions 2d, the beam 2 may not be formed first flange portion 2d. Figure 7 is a sectional view showing a schematic configuration of a second modification of the underrun protector 1 according to this embodiment. Even in this case, it is possible to some extent the deformation of the beam 2, it is possible to improve the load bearing performance of the underrun protector. However, as described above, when configured by the first flange portion 2d is not formed beam 2 is lower high ductility strength tensile steel, either at least a first upper surface portion 2a or the first lower surface portion 2b since the end breakage occurs in the pressure, the effect of improving the load bearing performance may be lower than expected. Therefore, from the viewpoint of suppressing an end breakage as described above, in the first top portion 2a and the first lower surface portion 2b, that the first flange portion 2d are formed preferably.
[0052]
　Further, in the above embodiment, the first upper surface portion 2a and the protruding top portion 6a and the first lower surface portion 2b and the projecting lower surface portion 6b was to be bolted 22, bolt holes 7 and bolt holes 8 position is not limited to the examples described in the above embodiment. The shape of the beam 2 in the shape or the stay 4, both parts at other positions may be fixed. Also, rather than bolted, for example, it may be fixed to both parts by welding. However, since it is easy to replace only the beam 2 which is damaged by the use of bolts alone, thus improving maintainability.
[0053]
　In the above embodiment, although the projecting portion 6 is formed in contact with the first upper surface portion 2a and the first lower surface portion 2b, projecting portion 6 and the first upper surface portion 2a and the first lower surface portion 2b may not in contact with each other. Protrusions 6 may be fixed to the first upper surface portion 2a and the first lower surface portion 2b. The insertion length of the projecting portion 6 from the opening of the beam 2 inward of the beams 2 is not particularly limited. For example, the tip of the protruding portion 6 may not necessarily abut on the first side surface portion 2c. However, if the short insertion length of the projecting portion 6, at least either the first upper surface portion 2a or the first lower surface portion 2b, out-of-plane deformation is likely to occur during a load input. Therefore, it is preferable as large as possible insertion length of the projecting portion 6.
[0054]
　In the above embodiment, the stay 4 is provided in contact with the first flange portion 2d of the beam 2, the stay 4 first flange portion 2d may not necessarily contact. However, if the stay 4 and the first flange portion 2d is in contact with the load from the first flange portion 2d to the stay 4 is transmitted when the input of the load. Thus, the load transmitted to the stay 4 is increased, it is possible to improve the load carrying capacity.
[0055]
　Further, in the above embodiment, the stay 4 is formed from a single part, or may be an assembly composed of a plurality of parts. If forming a protrusion 6 which can stay 4 is disposed inwardly of the beam 2 is not particularly limited about the structure of the stay 4.
[0056]
　It has been described above underrun protector 1 according to the first embodiment of the present invention.
[0057]
　<< 3. Second Embodiment >>
　Next, a description will be given underrun protector 1 according to the second embodiment of the present invention.
[0058]
　Figure 8 is a perspective view showing a schematic configuration of underrun protector 1 according to the second embodiment of the present invention. A fundamental component of underrun protector 1, beam 2, the stay 4, for the function of the frame mounting plate 5, and the vehicle body frame 20 is the same as the first embodiment of the present invention, not explained to. Incidentally, the stay 4 of the present embodiment is different from the first embodiment of the present invention, the protruding portion 6 has no, is formed so as to extend in the vertical direction V.
[0059]
　As shown in FIG. 8, the surface facing the opening surface 4a of the pair of stays 4, the bracket 10 of L-shaped is provided. Bracket 10 is composed of a plate-shaped beam attachment portion 10b is a vertical plate-like stay mounting portions 10a, and the stay mounting portions 10a. Stay mounting portion 10a is fixed to the side surface of the stay 4. The beam attachment portion 10b is fixed in an orientation such as to be in contact with the rear surface of the beam 2 (anti-collision surface). Incidentally, the bracket 10 in this embodiment is an example of the beam mounting member, which is part of the connection structure 3.
[0060]
　9, the underrun protector 1 according to this embodiment and is a cross-sectional view taken along IX-IX cut line shown in FIG. As shown in FIG. 9, between the beam 2 and the bracket 10, the first reinforcing member 9 covering all or part of the back surface of the beam 2 is provided. In perpendicular cross section in the vehicle width direction W beam 2 with closed cross section by the first reinforcing member 9 is formed. In the example shown in FIG. 9, the first reinforcing member 9 is formed in a rectangular shape so as to extend in the vehicle width direction W.
[0061]
　Further, as shown in FIG. 9, the bolt hole 11 is formed in the beam attachment portion 10b of the bracket 10. Further, the first reinforcing member 9, for fixing the first flange portion 2d and the bracket 10, bolt holes 12 corresponding to the bolt diameter is formed. Figure 10 is a longitudinal sectional view showing the shape of the first reinforcing member underrun protector according to the present embodiment. As shown in FIG. 10, through the bolt holes 12, the beam 2, the bracket 10 and the first reinforcing member 9, is fastened by bolts (not shown).
[0062]
　Underrun protector 1 according to this embodiment is constructed as described above. According to such a configuration, the beam 2 has a hat shape, the beam 2 and the bracket 10 is fixed in the first flange portion 2d projecting outwardly in the vertical direction V. Thus, the input load F, like the distal end of the first flange portion 2d is rotated in the impact surface side, the moment M and the rotation center point C in FIG. 1 occurs. In this case, even at the end of the end portion and the bracket 10 of the first reinforcing member 9 fixed to the first flange portion 2d, it occurs deformation of rotating in the impact surface side.
[0063]
　Such moment M 1 is a moment M acts the first reinforcing member 9 and the bracket 10 to deflect inwardly of the beam 2 2 to be a moment in the opposite direction. Therefore, another moment is canceled, deflection can be suppressed to a beam inside of the first reinforcing member 9 and the bracket 10.
[0064]
　Thus, in the vicinity of the outer position than the mounting position of the beam 2 P2 for input load, the local cross-sectional deformation of the beam 2 can be suppressed more than conventionally. As a result, it is possible to increase the maximum load value in the load-bearing resistance evaluation test in the position P2 than in the past. Therefore, it is possible to improve the underrun protector load carrying capacity.
[0065]
　Having described underrun protector 1 according to this embodiment, the present invention is not limited to such an example. For example, the bracket 10, the stay 4, and the shape of the first reinforcing member 9 is not limited to the examples described in the above embodiment. The shape of these members is appropriately changed by the performance of the underrun protector 1 to be shaped or request of the body frame 20. For example, in the above embodiment, the first reinforcing member 9 tabular is provided in contact with the first flange portion 2d, the first reinforcing member 9, the inner beam 2 (e.g., beam 2 it may be provided between) the upper surface portion 2a and the lower surface portion 2b. That is, the first reinforcing member 9 is the vertical cross section in the vehicle width direction W, as closed section by the beam 2 and the first reinforcing member 9 is formed, if provided in the opening portion of the beam 2 if may. Thus, it is possible to improve the load carrying capacity. It will be described later such modification of the first reinforcing member 9.
[0066]
　Further, in the above embodiment, the beam 2 and the bracket 10 was to be bolted 23, the position of the bolt holes provided in these members is not limited to the examples described in the above embodiment. Also, rather than bolted, it may be fixed to both parts by welding. However, since it is easy to replace only the beam 2 which is damaged by the use of bolts alone, thus improving maintainability.
[0067]
　(First Modification)
　In the above embodiment, a configuration providing a first reinforcing member 9 on the back side of the beam 2 (anti-collision side), the present invention is not limited to such an example. For example, without the first reinforcing member 9 is provided on the underrun protector 1, the beam 2 may be configured to be attached to the bracket 10 directly. Figure 11 is a sectional view showing a schematic configuration of a first modification of the underrun protector 1 according to this embodiment. As shown in FIG. 11, the beam 2 is be configured to be attached to the bracket 10 directly, it is possible to suppress the deflection of the inward beam 2 of the embodiment similarly to each member. Therefore, it is possible to improve the load bearing performance of the underrun protector.
[0068]
　(Second Modification)
　In the first modification of the underrun protector according to the embodiment, a configuration in which the beam 2 is attached to the bracket 10, the present invention is not limited to such an example. For example, without the bracket 10 is provided on the underrun protector 1, the beam 2 may be configured to be attached to the stay 4 directly. Figure 12 is a sectional view showing a schematic configuration of a second modification of the underrun protector 1 according to this embodiment. Be configured to beam 2 is attached to the stay 4 directly, it is possible to suppress the deflection of the inward beam 2 of the embodiment similarly to each member. Therefore, it is possible to improve the load bearing performance of the underrun protector.
[0069]
　Further, regardless of the connection structures 3 having the structure shown in the first modification and the second modification (bracket 10 or the stay 4), the beam 2 has a hat shape, a first flange portion 2d it is preferred that the beam 2 and the connection structure 3 is fixed at. Thus, it is possible to improve the load bearing performance of the underrun protector. However, by further providing the first reinforcing member 9, it is possible to further improve the load carrying capacity. Therefore, it is preferable that the first reinforcing member 9 is provided on the underrun protector 1.
[0070]
　(Third Modification)
　In addition, in order to improve more effectively load carrying capacity by using the first reinforcing member 9, it is required to further refine the shape or arrangement of the first reinforcing member 9 . For example, in the underrun protector 1 shown in Figure 9, the deformation of the beam inside can be suppressed more than conventionally. However, the first upper surface portion 2a and the first lower surface portion 2b, in the first flange portion 2d vicinity can readily deform to cross inside. The present inventors have further intensively studied the shape or arrangement of the first reinforcing member 9, it has been developed underrun protector 1 described below.
[0071]
　13 and 14 are cross-sectional views in perspective view, and XIV-XIV section line showing the schematic configuration of a third modification of the underrun protector 1 according to this embodiment. As shown in FIG. 14, the first reinforcing member 9 according to the present modification, in vertical cross section in the vehicle width direction W, the first reinforcing member upper surface portion 9a and the first reinforcement member lower surface 9b facing When, with a U-shaped cross-sectional shape having a first reinforcing member side portions 9c for connecting one end of the first reinforcing member upper surface portion 9a and the first reinforcement member lower surface portion 9b.
[0072]
　In this first reinforcement member 9, the first reinforcing member upper surface portion 9a and the first reinforcement member lower surface portion 9b, respectively a first upper surface portion 2a and the first lower surface portion 2b, for example, by welding or the like It is. Also, closed section is formed by the beam 2 and the first reinforcing member 9. Further, in the example shown in FIGS. 13 and 14, the first reinforcing member side portion 9c is arranged in contact with the beam attachment portion 10b of the bracket 10. By disposing the first reinforcing member 9 thus produces an effect of inhibiting the first top portion 2a and the first lower surface portion 2b, and deformation of the cross section inside of the first flange portion 2d near be able to. The fixing method of the first reinforcing member upper surface portion 9a and the first reinforcement member lower surface portion 9b and the first upper surface portion 2a and the first lower surface portion 2b is not limited to welding.
[0073]
　Further, as shown in FIG. 14, it is preferable that the first reinforcement member side portion 9c is arranged a first reinforcement member 9 so as to be located on the first flange portion 2d side. For example, the first reinforcing member upper surface portion 9a and the first reinforcement member lower surface portion 9b, the ends of the first side of the reinforcing member side portions 9c are not provided is, with respect to the first reinforcement member side portion 9c it is preferably provided so as to be positioned outside of the vehicle in the vehicle longitudinal direction L Te. Thus, the first reinforcing member side portions 9c sectional moment M deforms inward 3 occurs, the first reinforcing member upper surface portion 9a and the first reinforcement member lower surface portion 9b is an action to be deformed in the cross-sectional outer occur. Therefore, it is possible to further suppress the deformation in the cross section inside of the first top portion 2a and the first lower surface portion 2b. As a result, it is possible to further improve the load carrying capacity.
[0074]
　The sectional shape of the first reinforcing member 9 is not limited to the U-shape shown in FIGS. 13 and 14. That is, the first reinforcing member 9, one end of the first reinforcing member upper surface portion 9a and the first and the reinforcement member lower surface portion 9b, the first reinforcing member upper surface portion 9a and the first reinforcement member lower surface 9b facing and a first reinforcing member side portions 9c for connecting, and, the first reinforcing member upper surface portion 9a and the first upper surface portion 2a, and the first reinforcement member lower surface portion 9b and the first lower surface portion if 2b and is only to be fixed respectively, it is possible to improve the load carrying capacity. For example, it has a structure in which a recess (not shown) to the first reinforcement member side portion 9c, it is possible to receive the same effect.
[0075]
　(Fourth Modification)
　The first reinforcement member side portion 9c is preferably in contact with respect to the beam attachment portion 10b of the bracket 10. This can further suppress the out-of-plane deformation of the first reinforcing member 9 and the beam attachment portion 10b. Therefore, it is possible to further improve the load carrying capacity. A part of the first reinforcing member side portion 9c is if abuts against the beam attachment portion 10b, the effect of suppressing out-of-plane deformation as described above can occur. Figure 15 is a sectional view showing a schematic configuration of a fourth modification of the underrun protector 1 according to this embodiment. As shown in FIG. 15, the first reinforcing member 9, the central portion of the first reinforcing member side portion 9c, the first reinforcing member protrusions 9d may be further provided. By the first reinforcing member protrusions 9d abuts against the beam attachment portion 10b, it is possible to obtain the effect of suppressing out-of-plane deformation of the first reinforcing member 9 and the beam attachment portion 10b. Further, the first upper surface portion 2a and the first lower surface portion 2b, from the viewpoint of inhibiting the deformation of the cross section inside of the first flange portion 2d near, the first reinforcing member upper surface portion 9a and the first reinforcing member the lower surface portion 9b is preferably located near the first flange portion 2d.
[0076]
　(Fifth Modification)
　In addition, when the load is input to the beam 2 according to the present embodiment shown in FIG. 9, the beam attachment portion 10b can deform in a wave. Since this out-of-plane deformation is induced by, it may become an impediment to the improvement of the load bearing performance. The present inventors have further intensively studied the shape of the beam attachment portions 10b, have developed underrun protector 1 described below.
[0077]
　16 and 17 are cross-sectional views in perspective view, and XVII-XVII cutting line showing a schematic configuration of a fifth modification of the underrun protector 1 according to this embodiment. As shown in FIG. 17, the bracket 10 of the present modification, the shape of the beam attachment portion 10b has substantially a hat-shaped cross-sectional shape in the perpendicular cross section in the vehicle width direction W. In the example shown in FIGS. 16 and 17, the beam attachment portion 10b is first connected to the second top surface portion 10c and the second lower surface portion 10d, one end of the second upper surface part 10c and the second lower surface portion 10d and second side surface portions 10e, at the other end (one end of the second side of the side surface portion 10e is not provided) of the second upper surface part 10c and the second lower surface portion 10d, which projects outward in the vertical direction V and a pair of second flange portions 6f formed to. The second flange portion 10f and the first flange portion 2d is fastened for example by bolts (not shown). This is the beam 2 and the bracket 10 is fixed. The fixing method between the beam 2 and the bracket 10 is not limited to a bolt fastening. Further, in the example shown in FIGS. 16 and 17, the second upper surface part 10c and the second lower surface portion 10d is formed so as to be inclined with respect to the horizontal plane, the second upper surface part 10c and the second inclination angle relative to the horizontal plane of the lower surface portion 10d is appropriately changed in accordance with the required load carrying capacity and the surrounding margin.
[0078]
　In such bracket 10, the beam attachment portion 10b by having the schematic hat-shaped cross section, as compared with the plate-shaped beam attachment portion, sectional rigidity and strength are increased. Therefore, it is possible to inhibit out-of-plane deformation of the wavy occurring bracket 10. Further, as shown in FIG. 17, the moment M generated in the beam attachment portion 10b 2 and the moment M generated in the first flange portion 2d 1 by are opposite, obtain the effect of inhibiting the deformation of each other be able to. This makes it possible to improve the load carrying capacity.
[0079]
　Further, if the beam attachment portion 10b has a schematic hat-shaped cross-section, as shown in FIG. 17, the vehicle back and forth relative to the second side surface portion 6e is interior side than the opening cross section of the beam 2 (the first flange portion 2d it is preferable that the positioned inner side) of the direction L. By the shape according to the beam attachment portion 10b, it is possible to increase the cross-sectional area of ​​closed section which is formed by the beam 2 and the bracket 10 in a perpendicular cross section in the vehicle width direction W. Thus, since the flexural rigidity and strength of the beam 2 is increased, it becomes possible to improve the load carrying capacity.
[0080]
　Further, if the beam attachment portion 10b has a schematic hat-shaped cross-section, the stay attachment portion 10a and the beam attachment portion 10b may be a separate member. However, in that case, the cost for assembling the stay mount part 10a and the beam attachment portion 10b is increased. Therefore, the stay attachment portion 10a and the beam attachment portion 10b is preferably shaped as brackets 10 of the monolith.
[0081]
　(Sixth Modification)
　In addition, when the beam attachment portion 10b has a schematic hat-shaped cross section, the first reinforcing member 9 may be further provided on the inner side of the beam 2. Figure 18 is a sectional view showing a schematic configuration of a sixth modification of the underrun protector 1 according to this embodiment. As shown in FIG. 18, the first reinforcing member side portions 9c, toward the second side portion 6e of the beam attachment portion 10b (the vehicle interior side of the vehicle longitudinal direction L with respect to the first flange portion 2d) it is preferred that the first reinforcing member protrusions 9d which projects is provided. That is, the first reinforcing member 9 is the vertical cross section in the vehicle width direction W, the first reinforcing member upper surface portion 9a and the first reinforcement member lower surface portion 9b opposite the first reinforcing member upper surface portion 9a When and a first reinforcing member side portions 9c for connecting one end of the first reinforcing member lower surface 9b, a part of the first reinforcement member side portion 9c protrudes second side portion 6e It is preferred. In this embodiment it is possible to increase the closed section of the cross-section is formed by the beam 2 and the first reinforcing member 9 in the perpendicular cross section in the vehicle width direction W. Thus, it is possible to increase the flexural rigidity and strength of the beam 2, it is possible to improve the load carrying capacity. Further, as described above, it is further preferable that a portion of the first reinforcing member side portion 9c abuts against the second side portion 6e. Thus, it is possible to suppress the out-of-plane deformation of the first reinforcing member 9 and the beam attachment portion 10b. Further, the first upper surface portion 2a and the first lower surface portion 2b, from the viewpoint of inhibiting the deformation of the cross section inside of the first flange portion 2d near, the first reinforcing member upper surface portion 9a and the first reinforcing member the lower surface portion 9b is preferably located near the first flange portion 2d.
[0082]
　(Seventh Modification)
　The conventional underrun protector 60, would also be present in which a hat-shaped reinforcing member 63 as shown in FIG. 19. Hat reinforcing member 63 has a top portion 63a and the lower surface portion 63b which faces and is arranged to pass over the impact surface and anti-collision surface of the rectangular cross section of the beam 61. Thereby, it is suppressing reinforcing the deformation of the impact surface and anti-collision surface.
[0083]
　If the beam attachment portion 10b has a schematic hat-shaped cross-section, may be provided inside the closed cross section is a reinforcing member as shown in FIG. 19 is formed by the beam 2 and beam attachment portion 10b.
[0084]
　20 and 21 are sectional views of the seventh perspective view showing a schematic configuration of a modification of the embodiment underrun protector 1 according to the embodiment, and XXI-XXI cutting line. As shown in FIG. 21, the second reinforcing member 90, in a perpendicular cross section in the vehicle width direction W, and the second reinforcing member upper surface portion 90a and the second reinforcement member lower surface portion 90b which faces, in the second the other end of the reinforcement member upper surface portion 90a and the second reinforcing member side portion 90c connecting one end of the second reinforcing member lower surface portion 90b, the second reinforcing member upper surface portion 90a and the second reinforcement member lower surface portion 90b ( at one end) of the second reinforcing member side portion 90c is not provided the side, and a pair of second reinforcing member flange portion 90e that is formed so as to protrude outward in the vertical direction V. The second reinforcing member side portion 90c of the second reinforcing member 90 is located inside the vehicle than the opening cross section of the beam 2 (interior side of the vehicle longitudinal direction L with respect to the first flange portion 2d). The second reinforcing member flange portion 90e and the first side surface portion 2c is fixed, for example, by welding or the like. The fixing method of the second reinforcing member flange portion 90e and the first side surface portion 2c is not limited to welding. Further, in the example shown in FIG. 21, the second reinforcing member upper surface portion 90a and the second reinforcement member lower surface portion 90b is formed so as to be inclined with respect to the horizontal plane, the second reinforcing member upper surface portion 90a and inclination angle relative to the horizontal plane of the second reinforcement member lower surface portion 90b is appropriately changed in accordance with the required load carrying capacity and beam shape.
[0085]
　By providing such a second reinforcing member 90, it is possible to reinforce that supports the impact surface (first side surface portion 2c). Furthermore, it is possible to increase the cross-sectional seat in perpendicular cross section in the vehicle width direction W, it is possible to increase the flexural rigidity and strength of the beam 2. This makes it possible to simultaneously improve the weight of the underrun protector 1 and load bearing performance. In the example shown in FIG. 21, the second reinforcing member side portion 90c of the second reinforcing member 90 is disposed so as to be in contact with the second side surface portion 10e of the beam attachment portion 10b, both completely it may not be in contact. That may be provided a gap between the second reinforcing member side portion 90c and a second side portion 6e in a range capable reinforcement for supporting the impact surface. However, as described above, in order to suppress the out-of-plane deformation of the second reinforcing member 90 and the beam mounting section 10b, the second reinforcing member side portion 90c abuts against the second side surface portion 6e It is preferred.
[0086]
　Also, when the first reinforcing member protrusions 9d shown in FIG. 18 is provided, or if the second reinforcing member 90 having a hat-shaped cross section shown in FIG. 21 is provided, the stay 4 and the second reinforcing member 90 there is a need to avoid the interference. To avoid interference, the stay 4, to recesses (not shown) may be provided for avoiding interference with the second reinforcing member 90, or notch may be (not shown) is provided . The recess is formed by a separate member from the stay 4 may be provided on the stay 4. However, if the notch is provided, the strength of the stay 4 may be reduced. Further, if the recesses of the stay 4 is formed by a separate member, since it is necessary to assembly of the stay 4 and the concave portion, the cost increases. Therefore, when providing a recess to the stay 4, it is preferable that the stay 4 and the recesses are formed integrally.
[0087]
　The vehicle protrusion distance D in the longitudinal direction L which starts beam mounting surface 10b of the first side surface portion 2c in the form (referred to as the present embodiment) shown in FIG. 21 2 referred to, the form (the conventional embodiment shown in FIG. 19 protrusion distance D in the vehicle longitudinal direction L which starts beam mounting surface 62 of the rectangular cross section of the beam 61 in) 1 is assumed to be the same. At this time, in the perpendicular cross section in the vehicle width direction W, the cross-sectional area of the closed section formed by being surrounded by the beam 2 and beam mounting surface 10b, toward the embodiment it is larger than that of the conventional embodiment. That is, when the vehicle position in the longitudinal direction L of the first side surface portion 2c is limited, without inhibiting its constraints, increasing the area of the closed section formed by being surrounded by the beam 2 and beam mounting surface 10b be able to.
[0088]
　(Eighth modification)
　FIG. 22 is a sectional view showing a schematic configuration of a modification of the eighth underrun protector 1 according to this embodiment. Referring to FIG. 22, when the cross-sectional area of the closed section formed by the beam 2 and beam mounting surface 10b is the same as the cross-sectional area of the closed section formed by the rectangular cross-section beam 61 of conventional embodiment shown in FIG. 19, protrusion distance D of the embodiment 2 is, protrusion distance D of the conventional embodiment 1 is shorter than the. In other words, while ensuring the load-bearing performance, the size of the underrun protector can be made compact as compared with the conventional. Therefore, it is possible to reduce the weight, and can improve the flexibility of the vehicle design.
[0089]
　It has been described above underrun protector 1 according to the second embodiment of the present invention.
[0090]
　In the first embodiment and the second embodiment described above, the beam 2 has a hat shape, such that the first side surface portion 2c is positioned outside of the vehicle in the vehicle longitudinal direction L, the beam 2 is connected structure It is fixed to the body 3. That is, the first side surface portion 2c is collision surface.
[0091]
　At this time, as for example shown in the first embodiment, by at least one of the first upper surface portion 2a or the first lower surface portion 2b is joined to the protruding portion 6 protruding inwardly of the beam 2, beam 2 may be secured to the connection structure 3. For example, as shown in the second embodiment, by a first flange portion 2d and the connecting structures 3 are joined, or may be fixed beam 2 in the connection structures 3. Also, the beam 2 and the connection structure 3 may be fixed by respective junction in the first or second embodiment.
[0092]
　For example, to improve the load bearing of the mounting position P1 of the beam 2, as in the first embodiment, the connection structure 3 is disposed inwardly of the beam 2. Thus, it is possible to suppress collapse section in the installation position. In order to improve the load-bearing outer position P2 in the vehicle width direction W than the mounting position of the beam 2, the connection structure 3 as in the second embodiment in contact with the first flange portion 2d of the beam 2 It is arranged like. Thus, it is possible to suppress the bending of the beam 2. In this way, it is possible in accordance with the collision type want to improve load-bearing, either the first or second embodiment, or selects both. That is, it is possible to improve the desired load carrying capacity of the underrun protector 1.
[0093]
　The present invention is not limited to the examples described in the above embodiment. For example, in the above embodiment, the first upper surface portion 2a and the first lower surface portion 2b is set to the horizontal, respectively, at least one of the first upper surface portion 2a or the first lower surface portion 2b, rather than horizontal state and it may be. For example, depending on the load bearing performance required, a first side portion 2c, as the angle between the first upper surface portion 2a and the first lower surface portion 2b becomes an obtuse angle, respectively, the first upper surface portion 2a and the first lower surface portion 2b may be provided in an inclined state. In this case, than the underrun protector having a rectangular cross-section beam, it is possible to improve the load carrying capacity.
[0094]
　<< 4. Third Embodiment >> of
　following describes underrun protector 1 according to the third embodiment of the present invention.
[0095]
　Figure 23 is a diagram showing an example of deformation state of underrun protector 71 when the load to conventional underrun protector 71 is input. As shown in FIG. 23, a conventional underrun protector 71 is, for example, the connection structure 72 that is attached to the vehicle frame (e.g., the stay and the bracket), extends in the vehicle width direction W, the beam mounting surface of the connecting structure 72 includes a mounted beam 73, a reinforcing member 74 provided so as to bridge between the connecting structures 72 and the beam 73. By this reinforcing member 74 is provided to improve the load resistance has been achieved.
[0096]
　However, as shown in FIG. 23, when the beam mounting surface of the connection structure 72 is formed in a plate shape, when a load F is inputted to the outside in the vehicle width direction W than the mounting position of the beam 73, the beam mounting surface stress is concentrated on the tip of the edge. Thus, the beam 73 will be bent in the edge. Then, since collapses is the cross section of the beam 73, it is difficult to sufficiently exhibit the load-bearing performance. The present inventors have a result of intensive studies, we have developed the underrun protector 1 according to the present embodiment described below.
[0097]
　Figure 24 is a perspective view showing a schematic configuration of underrun protector 1 according to the third embodiment of the present invention. As shown in FIG. 24, underrun protector 1 according to this embodiment includes a beam 2 of hat-shaped cross-section extends in the vehicle width direction W, the connecting structure 3 for mounting the beam 2 to the body frame 20 . Beam 2 is fixed to the body frame 20 via a connecting structure 3. Connection structure 3 in this embodiment, the stay 4 formed so as to extend in the vertical direction V, the bracket 10 of L-shaped provided between the beam 2 and the stay 4, and the third reinforcing member 15 having. In the example shown in FIG. 24, the beam 2 has the closed cross section alone in perpendicular cross section in the vehicle width direction W, the beam 2 may have a hat-shaped cross-section.
[0098]
　Figure 25 is the underrun protector 1 according to this embodiment and is a cross-sectional view taken along XXV-XXV section line shown in FIG. 24. As shown in FIGS. 24 and 25, the stay 4 is formed into a U-shape in plan view. Opening of the stay 4 is provided so as to face the inside of the vehicle width direction W. The part of the opening of the stay 4 is covered with the surface 10a of the body frame-side bracket 10 (corresponding to the stay mounting surface 10a), the tip surface 10a of the body frame-side bracket 10, the stay 4 outside the side wall portion 4c, for example, it is fixed by welding. Further, at right angles to the plane 10a of the body frame side, which is the surface of the beam 2 is attached to the bracket 10 (hereinafter, referred to as "beam mounting surface 10b") is on the back 4b of the stay 4, for example, it is fixed by welding there. Thus, the bracket 10 is fixed to the stay 4, the surface 10a and the stay 4 of the body frame-side bracket 10, portions (hereinafter, referred to as "closed-section portion 3b") which is a horizontal cross-sectional shape becomes closed section is formed that. Bracket 10 may be fixed to the side wall portions 4c of the stay 4. In this case, closed-section portion 3b is not formed by a bracket 10 and the stay 4. However, it can be suppressed by forming the closed cross-section portion 3b, and deformation of the stay 4 by the torsional moment occurring in the stay 4 in the event of a collision. Accordingly, as shown in FIG. 25, it is preferable to provide a bracket 10 and the stay 4 so as to form a closed cross-section portion 3b.
[0099]
　Referring also to FIG. 24, the upper part of the stay 4, the frame mounting plate 5 vehicle body frame (not shown) is attached is provided. The frame mounting plate 5 is the stay 4 is fixed for example by welding. The frame mounting plate 5 is fastened by a body frame and a bolt. Thus, the connection structure 3 is fixed to the vehicle body frame.
[0100]
　Referring to FIG. 25, on the outside of the distal end portion of the vehicle width direction W of the beam mounting surface 10b of the bracket 10, the bent portion 16 that is bent rearward in the vehicle longitudinal direction L are provided. The radius of curvature in the plane of the bent portion 16 is preferably from 50 ~ 200 mm. If the radius of curvature is below 50 mm, the beam 2 is to deform a small curvature, hardly stress concentration with respect to the beam 2 is reduced, it is difficult to obtain the effect of suppressing the bending of the beam 2. On the other hand, if the radius of curvature greater than 200 mm, due to the large curvature, the effect of the bent portion 16 is difficult to obtain, as in the case of not providing the bent portion 16 parts of the beam 2 has a stress at the tip of the edge of the beam mounting surface 10b become concentrated. The beam mounting surface 10b and the beam 2 is fastened by bolts, for example. Thus, the beam 2 is fixed to the connection structure 3.
[0101]
　The third reinforcing member 15 is provided so as to bridge between the rear 4b of beam mounting surface 10b and the stay 4 of the bracket 10. The third reinforcing member 15 in this embodiment is a plate of triangular shape, the back 4b of the stay 4 (hereinafter, referred to as "reinforcing member mounting surface") and are welded to the inner surface of the bracket 10. The third reinforcing member 15 is disposed two along the vertical direction V. The third reinforcing member 15, in the vicinity of the outer tip of the vehicle width direction W of the beam mounting surface 10b, and is formed so as to follow the bent portion 16. That is, the shape of the outer tip of the vehicle width direction W of the third reinforcing member 15 has a radius of curvature R equal to the radius of curvature of the bent portion 16.
[0102]
　Underrun protector 1 according to this embodiment is constructed as described above. According to such a configuration, as shown in FIG. 26, when the load to the beam 2 is entered, the beam 2 along the curved surface portion of the bent portion 16 is bent to deform. Thus, at the tip portion of the beam mounting surface 10b, it is possible to avoid local stress on the beam 2 is concentrated. Therefore, it is possible to prevent the collapse cross beam 2 by bending of the beam 2 as shown in FIG. 23. As a result, it is possible to sufficiently exhibit the load-bearing performance with underrun protector 1 is the original. This makes it possible to improve the load carrying capacity than a conventional underrun protector.
[0103]
　Having described underrun protector 1 according to this embodiment, the present invention is not limited to such an example. For example, the shape of each member of the connection structure 3 for connecting the beam 2 and the body frame (not shown) is not limited to those described in the above embodiment. More specifically, the stay 4 formed in a U-shape in plan view, the opening may be arranged so as to face the outside in the vehicle width direction W. In this case, a flat plate for covering the opening of the stay 4 is further provided, may be the third reinforcing member 15 is provided so as to bridge the beam mounting surface 10b and the flat-plate. Or, the surface 10a of the body frame-side bracket 10 to fit the opening of the stay 4 facing outward in the vehicle width direction W is welded, to pass over the surface 10a and the beam mounting surface 10b of the body frame-side bracket 10 the third reinforcing member 15 may be provided.
[0104]
　In place of the stay 4, may be used a plate-like member extending in the vertical direction V. In this case, by forming the U-shape in plan view the surface 10a of the frame mounting side of the bracket 10, welded to the surface 10a of the frame mounting side to the plate-shaped member, and the plate-like member and the beam mounting surface 10b the third reinforcing member 15 may be provided so as to bridge.
[0105]
　That is, the beam 2 and the body frame connecting structure 3 for connecting (not shown), the structural body portion provided so as to extend in the vertical direction V (for example, the stay 4), the frame attachment portion body frame is attached ( for example the frame mounting plate 5), and a beam attachment member beam is attached (e.g., bracket 10), the beam attachment member includes a beam mounting surface the beam is mounted, a plane perpendicular to the beam mounting surface in a plan view has, and a body connecting surface attached to the structural body portion, a bent portion which is bent toward the end portion of the outside in the vehicle width direction W of the beam mounting surface to the rear of the vehicle longitudinal direction L, in a plan view at least one third reinforcing member so as to bridge between the structural body portion and the beam mounting surface, but if further provided, load described in the above embodiment It is possible to obtain the effects such as improvement in performance. The planar portion of the beam attachment portion and the frame mounting portion may be integrally formed.
[0106]
　(First Modification)
　In addition, as shown in FIG. 26, when a load on the beam 2 is input, the third reinforcing member 15 according to the embodiment may be deformed to bite into the stay 4. In contrast, for example, the inside of the closed-section portion 3b of the connection structure 3 may be provided a reinforcing plate 17. Figure 27 is a perspective view showing a schematic configuration of a first modification of the underrun protector 1 according to this embodiment. As shown in FIG. 27, the reinforcing plate 17, a third of the distal end portion 15a or tip portion 15b of the reinforcing member 15, the vehicle longitudinal direction L of the rear side of the distal end portion 15a (the closed-section portion 3b side of the distal end portion , they are arranged in accordance with the position of hereinafter referred to as "rear side tip 15a"). Then, the reinforcing plate 17 is provided so as to extend from the rear side leading end portion 15a of the third reinforcing member 15 at the relatively lower side to the rear side leading end portion 15a of the third reinforcing member 15 in a relatively upper side It is. Further, as shown in FIG. 26, the reinforcing plate 17, to both end portions in a plan view may be shaped so as to project forward in the vehicle longitudinal direction L, to protrude to the rear of the vehicle longitudinal direction L shape may have such.
[0107]
　By such a reinforcement plate 17 is disposed inwardly of the closed cross-section portion 3b, as shown in FIG. 28, in the case where load to the beam 2 is entered, transmitted through the beam 2 Load it can produce an effect of inhibiting the deformation of the inside of the stay 4 by. Therefore, it is possible to improve the load carrying capacity.
[0108]
　Such effects can be enjoyed in a case where a plurality of third reinforcing member 15 is provided. That is, the reinforcing plate 17 of the vehicle front-rear direction L in accordance with the position of the rear-side tip 15a, the third reinforcing member 15 positioned on the lowermost rear side leading end portion 15a from the third located uppermost only to be provided so as to extend to the rear side distal end portion 15a of the reinforcing member 15. Thus, it is possible to obtain the effect of improving the load carrying capacity.
[0109]
　(Second Modification)
　Moreover, as shown in FIG. 25, it is preferable to increase as much as possible an area in contact with the reinforcing member mounting surface 4b of the third reinforcing member 15. For example, the length of the third vehicle longitudinal direction L of the portion connected to the closed-section portion 3b of the connection structures 3 in the reinforcing member 15 of L 1 and the vehicle longitudinal direction L of the reinforcing member mounting surface 4b of the closed-section portion 3b of the length L 2 when the, it is preferable that the third reinforcing member 15 is provided so as to satisfy the following formula (1).
[0110]
　Ｌ １／Ｌ ２≧０．８　・・・（１）
[0111]
　Incidentally, 0.8 lower limit values ​​shown in the above formula (1), as shown in Examples described later, is a value found by the present inventors from the test results performed in multiple conditions.
[0112]
　Figure 29 is a perspective view showing a schematic configuration of a second modification of the underrun protector 1 according to this embodiment. Further, FIG. 30 is a diagram illustrating an example of a state of deformation of the underrun protector 1 when the load to underrun protector 1 according to this modification is entered. Rear tip 15a of the third vehicle longitudinal direction L of the reinforcing member 15 is, for the shape extending to the sidewall portion 4c of the stay 4, as shown in FIG. 29, closed cross-section portion 3b via the third reinforcing member 15 the load transmitted can be widely distributed in the side wall portions 4c of the stay on. Accordingly, as shown in FIG. 30, it is possible to suppress the out-of-plane deformation of the inward of the closed cross-section portion 3b. Therefore, it is possible to further improve the load carrying capacity of the underrun protector.
[0113]
　(Third Modification)
　FIG. 31 is a perspective view showing a schematic configuration of a third modification of the underrun protector 1 according to this embodiment. As shown in FIG. 31, the horizontal cross section of the closed-section portion 3b of the connection structure 3, so as to fill the inner space of the closed-section portion 3b, partitions member 18 may be provided. The partition member 18, for example, plate-shaped member is used. The material of the partition member 18 is not particularly limited. For example, the material of the partition member 18 is a metal, it may be a plastic or composite component. The partition member 18 is arranged according to the installation height of the third reinforcing member 15. By providing the partition member 18 inwardly of the closed cross-section portion 3b, since partition member 18 inhibits the out-of-plane deformation of the stay 4, the inward deformation to the closed-section portion 3b of the connection structures 3 it can be suppressed. Therefore, it is possible to further improve the load carrying capacity. In order to reduce the weight, partially hollowed in the region inside the peripheral end portion of the partition member 18 may be made.
[0114]
　It has been described above underrun protector 1 according to the third embodiment of the present invention.
[0115]
　<< 5. Fourth Embodiment >> of
　following describes underrun protector 1 according to the fourth embodiment of the present invention. Underrun protector 1 according to this embodiment, the first embodiment to the configuration obtained by combining a third of the salient components of underrun protector 1 according to the embodiment (the projections and the reinforcing member) of the present invention a.
[0116]
　Figure 32 is a perspective view showing a schematic configuration of underrun protector 1 according to the fourth embodiment of the present invention. Figure 33 is the underrun protector 1 according to this embodiment and is a cross-sectional view taken along XXXIII-XXXIII cutting line shown in FIG. 32. Figure 34 is the underrun protector 1 according to this embodiment and is a cross-sectional view taken along XXXIV-XXXIV cutting line shown in FIG. 32. Incidentally, a fundamental component of underrun protector 1, beam 2, stays 4, frame mounting plate 5, the bracket 10, for the function of the third reinforcing member 15 and the body frame 20, a first of the present invention are the same as defined in embodiment to the third embodiment, the description thereof is omitted.
[0117]
　As shown in FIGS. 32 and 33, the stay 4 according to this embodiment has a protrusion 6. The projecting portion 6 projects from the opening of the beam 2 inwardly of the beam 2 is fixed to the first upper surface portion 2a and the first lower surface portion 2b of beam 2. Incidentally, as shown in FIG. 33, the cross-sectional shape in the perpendicular cross section in the vehicle width direction W of the beam 2 according to the present embodiment is different from the first embodiment of the present invention, even T-shaped good. Such shape, the stay 4, it is possible to arrange by abutment against each of the first flange portion 2d of the beam 2. Accordingly, load transmitted from the first flange portion 2d to the stay 4 is increased. Thus, load bearing performance is improved with respect to a load applied to the mounting position P1 of the beam 2 shown in FIG.
[0118]
　Further, as shown in FIGS. 32 and 34, the opening of the beam 2 according to the present embodiment, the first reinforcing member 9 is provided. A first reinforcing member upper surface portion 9a and the first reinforcement member lower surface portion 9b of the first reinforcing member 9, a first upper surface portion 2a and the first lower surface portion 2b is joined by respectively for example welding there. Also, closed section is formed by the beam 2 and the first reinforcing member 9. This can further suppress the deformation of the cross section inside of the first upper surface portion 2a and the first lower surface portion 2b. This improves the load carrying capacity for the load to be applied to the outer position P2 in the vehicle width direction W than the mounting position of the beam 2 shown in FIG.
[0119]
　Further, as shown in FIGS. 32 and 34, between the stay mounting surface 10a and the beam mounting surface 10b of the bracket 10 according to this embodiment, the third reinforcing member 15 is bridged. Further, on the outside of the distal end portion in the vehicle width direction W of the beam mounting surface 10b of the bracket 10, the bent portion 16 that is bent rearward in the vehicle longitudinal direction L are provided. Thus, when a load is applied to the outer position P2 in the vehicle width direction W than the mounting position of the beam 2 shown in FIG. 2, locally stress to the beam 2 at the tip portion of the beam mounting surface 10b is concentrated it is possible to avoid that. This improves the load carrying capacity for the load to be applied to the outer position P2 in the vehicle width direction W than the mounting position of the beam 2 shown in FIG.
[0120]
　Underrun protector 1 according to this embodiment is constructed as described above. Underrun protector 1 according to this embodiment, the protrusion 6 shown in the first embodiment of the present invention, the second and shown in the embodiment of the first reinforcing member 9 of the present invention, the present invention with the bracket 10 and the third reinforcing member 15 shown in the third embodiment, the. Thus, it is possible to improve the load carrying capacity for each of the load applied to the outer position P2 in the vehicle width direction W than the mounting position P1, and mounting position P1 of the beam 2 shown in FIG. In other words, it is possible to improve the overall load-bearing performance of the underrun protector 1.
[0121]
　In the above embodiment, although each of the components according to the first embodiment to the third embodiment of the present invention is included in the underrun protector 1, the present invention is not limited to such an example. For example, the components shown in the first embodiment and the second embodiment of the present invention may be incorporated in the underrun protector 1. The first embodiment and the third respective components shown in the embodiments of the present invention may be incorporated in the underrun protector 1. The components shown in the second embodiment and the third embodiment of the present invention may be incorporated in the underrun protector 1. Furthermore, for the various modifications shown in the embodiments, it is possible to incorporated underrun protector 1 according to another embodiment. Each of the components shown in the embodiments, unless occur structurally interference, may be incorporated into an appropriate underrun protector 1. By combining these components in a composite manner, it is possible to improve the load carrying capacity with respect to the input position of the plurality of load, also can be further increased rate of improvement in the load bearing performance.
[0122]
　It has been described above underrun protector 1 according to the fourth embodiment of the present invention.
Example
[0123]
　(Experimental Example 1)
　and the underrun protector according to a first embodiment of the present invention, with reference to the underrun protector of the conventional structure were carried out load-bearing resistance evaluation test. Underrun protector having the conventional structure (Comparative Example 1), except for the protruding portion of the stay from the configuration shown in FIG. 4, and has a structure beam cross-sectional shape is rectangular cross-section. Also, the underrun protector according to a second embodiment of the present invention, an underrun protector having the structure shown in FIG. 4 (Example 1). Beam, the tensile strength is formed by 780MPa grade high-tensile steel, stays, tensile strength is formed a thick material 540MPa class.
[0124]
　Load resistance evaluation test, against the indenter beam side portion of the stay mounting position P1 shown in FIG. 2, was done by entering the load. Figure 35 is a diagram for explaining a test method for load bearing evaluation test for underrun protector 1 according to the experimental example 1. Underrun protector 1 shown in FIG. 35 is a underrun protector 1 according to the first embodiment. As shown in FIG. 35, the indenter 101 is provided in the mounting position P1 of the beam 2, the load F is given to the indenter 101. Input position of the load, in the underrun protector according to Example 1 and Comparative Example 1, it is both same. Then, in those resistant load evaluation test, pushing amount and the input load of the indenter was recorded. Based on the record, load bearing performance of the underrun protector according to Example 1 and Comparative Example 1 were evaluated.
[0125]
　Figure 36 illustrates a relationship between input load and indentation amount in Example 1 and Comparative Example 1. Incidentally, FIG. 36 "load ratio" represents the ratio of the maximum input load obtained by the load-bearing evaluation test for Comparative Example 1 and recorded input load.
[0126]
　As shown in FIG. 36, in Comparative Example 1, the input load as the pressing amount of the indenter is increased becomes gradually larger. In Comparative Example 1, when a certain degree indenter is pushed, the input load is substantially constant. On the other hand, in Example 1, the increase in input load at indentation amount is small phase was remarkable. In Example 1, then, the input load decreased gradually.
[0127]
　Maximum load ratio of underrun protector according to Example 1 for the underrun protector according to Comparative Example 1 in the load-bearing resistance evaluation test are shown in Table 1.
[0128]
[Table 1]

[0129]
　As shown in Table 1, according to the underrun protector according to the first embodiment, it is possible to improve relative underrun protector according to Comparative Example 1, the load bearing of 70% or more.
[0130]
　As described above, according to the results of this experimental example, underrun protector according to a first embodiment of the present invention, the conventional underrun protector, when a load is applied to the mounting position of the beam, excellent it was shown to have a load bearing.
[0131]
　(Experimental Example 2)
　Next, by using the underrun protector according to a second embodiment of the present invention, the underrun protector of the conventional structure were carried out load-bearing resistance evaluation test. The underrun protector conventional structure, the underrun protector according to Comparative Example 1 above, with respect to underrun protector 1 according to Comparative Example 1, underrun of the configuration shown in FIG. 19 adds a second reinforcing member a protector (Comparative example 2). Further, under the underrun protector according to a second embodiment of the present invention, except for the first reinforcement member with respect to the configuration shown in underrun protector (Example 2), FIG. 8 of the configuration shown in FIG. 8 run protector (example 3), underrun protector (example 4) of the configuration shown in FIG. 14, underrun protector (example 5) of the configuration shown in FIG. 17, and configuration underrun protector shown in FIG. 22 (embodiment example 6). Beam, the tensile strength is formed by 780MPa grade high-tensile steel, the stay and the bracket has a tensile strength is formed a thick material 540MPa class. The first reinforcing member and the second reinforcing member has a tensile strength is formed a thick material 780MPa class.
[0132]
　Load resistance evaluation test was conducted by applying a indenter, and inputs a load to the beam side surface portion of the outer position P2 in the vehicle width direction W than the stay mounting position shown in FIG. Figure 37 is a diagram for explaining a test method for load bearing evaluation test for underrun protector 1 according to Example 2. Underrun protector 1 shown in FIG. 37 is a underrun protector 1 according to the second embodiment. As shown in FIG. 37, than the mounting position P1 of the beam 2 indenter 102 is provided outside the position P2 in the vehicle width direction W, the load F is given to the indenter 102. Input position of the load, in the underrun protector according to each of Examples and Comparative Examples, are both the same. Then, in those resistant load evaluation test, pushing amount and the input load of the indenter was recorded. Based on the record, load bearing performance of the underrun protector according to each of Examples and Comparative Examples were evaluated.
[0133]
　Figure 38 illustrates a relationship between input load and indentation amount in Example 2 and Comparative Example 1. Incidentally, FIG. 38 "load ratio" represents the ratio of the maximum input load obtained by the load-bearing evaluation test for Comparative Example 1 and recorded input load.
[0134]
　As shown in FIG. 38, Example 2 and Comparative Example 1 both as the indenter is pushed, to a certain extent the pressing amount becomes large input load. In Example 2 and Comparative Example 1 is then gently input load is reduced. Thus, with respect to the relationship between the input load and the indentation amount, in Example 2 and Comparative Example 1, a similar tendency was observed. On the other hand, the maximum load value is input, towards the Example 2 than in Comparative Example 1 is increased dramatically.
[0135]
　Next, Example 2 for underrun protector according to Comparative Example 1, Example 3, the maximum load ratio and the weight ratio of the underrun protector according to Example 4 and Example 5 are shown in Table 2.
[0136]
[Table 2]

[0137]
　As shown in Table 2, according to the underrun protector according to Embodiment 2, it is possible to improve relative underrun protector according to Comparative Example 1, the load bearing of 30% or more. Further, according to the underrun protector according to Example 3, against underrun protector according to Comparative Example 1, it is possible to improve the load-bearing 5%. Furthermore, according to the underrun protector according to Example 3, against underrun protector according to Comparative Example 1, it can be about 10% lighter. That is, according to the underrun protector according to Example 3, the conventional underrun protector while achieving weight reduction, it is possible to improve the load carrying capacity.
[0138]
　On the other hand, according to the underrun protector according to Embodiment 4, with respect to underrun protector according to Comparative Example 1, load resistance to thereby improve more than 100%. That is, underrun protector according to the fourth embodiment, a high load bearing performance than underrun protector according to a second embodiment. Accordingly, by providing the first reinforcing member having a U-shaped cross section inwardly of the beam, it is possible to improve the load carrying capacity.
[0139]
　On the other hand, according to the underrun protector according to Example 5, against underrun protector according to Comparative Example 1, load resistance to thereby improve more than 15%. Furthermore, underrun protector according to Example 5, to the underrun protector according to Comparative Example 1, may be about 10% lighter. Also, the underrun protector according to Example 5, underrun protector and weight according to Example 3 are comparable. However, the load bearing performance of the underrun protector according to Example 5 is higher than the underrun protector according to the third embodiment. Therefore, the shape of the beam attachment portion of the bracket by a hat-shaped cross-section, it can be seen that the load bearing performance is further improved.
[0140]
　Next, Table 3 shows the maximum load ratio and the weight ratio of the underrun protector according to Example 6 for underrun protector according to Comparative Example 2.
[0141]
[table 3]

[0142]
　According to underrun protector according to Example 6, with respect to underrun protector according to Comparative Example 2, it is possible to improve the load bearing 4%. Furthermore, according to the underrun protector according to Example 6, with respect to underrun protector according to Comparative Example 2, it can be about 20% lighter. That is, the second reinforcing member and the bracket has a hat-shaped cross section, and, if provided so as to support the side surface of the beam and the bracket, the conventional underrun protector while achieving weight reduction , it is possible to improve the load-bearing performance.
[0143]
　As described above, according to the results of this experimental example, underrun protector according to a second embodiment of the present invention, the conventional underrun protector on the outside of the position in the vehicle width direction W than the mounting position of the beam If the load applied for, it has been shown to have excellent load carrying capacity.
[0144]
　(Experiment 3)
　Next, by using the underrun protector according to a third embodiment of the present invention, the underrun protector of the conventional structure were carried out load-bearing resistance evaluation test. The third and the underrun protector in accordance with an embodiment of the present invention, a configuration underrun protector shown in FIG. 24 (Example 7), the bent portion on the outside of the distal end portion of the vehicle width direction W of the beam mounting surface It is provided. On the other hand, the underrun protector having the conventional structure, the underrun protector shown in FIG. 24, an under-run no bent portion at the outer tip of the vehicle width direction W of the beam mounting surface protector (Comparative Example 3). Beam, the tensile strength is formed by 780MPa grade high-tensile steel, the stay and the bracket has a tensile strength is formed a thick material 540MPa class. The third reinforcing members disposed in to bridge between the structural body portion and the beam mounting surface in plan view, the tensile strength is formed a thick material 540MPa class. The curvature radius of the bent portion according to Embodiment 9 is 100 mm, L 1 / L 2 is 0.6.
[0145]
　Load resistance evaluation test, in the same manner as in Experimental Example 2 above, row by applying a indenter, and inputs a load that the beam side surface portion of the outer position P2 in the vehicle width direction W than the stay mounting position shown in FIG. 2 We were. Input position of the load, in the underrun protector according to each of Examples and Comparative Examples, are both the same. Then, in those resistant load evaluation test, pushing amount and the input load of the indenter was recorded. Based on the record, load bearing performance of the underrun protector according to each of Examples and Comparative Examples were evaluated.
[0146]
　Figure 39 illustrates a relationship between input load and indentation amount in Example 7 and Comparative Example 3. As shown in FIG. 39, the maximum input load underrun protector according to Example 7 is greater than the maximum input load underrun protector according to Comparative Example 3. That is, by providing the bent portion on the tip portion of the beam mounting surface, it is possible to improve the underrun protector load carrying capacity.
[0147]
　(Experimental Example 4)
　Next, the underrun protector having different structures were evaluated for influence on the load carrying capacity due to a difference in the structure. Type structure of the underrun protector in the present embodiment, the beam mounting surface of the structure is provided outside the distal end bent portion of the vehicle width direction W A, reinforcing plate shown in FIG. 27 to the structure A has been added structure B, and partition member shown in FIG. 31 is a three additional structure C to the structure a. The shape of the third reinforcing members are identical for each configuration. As for the structure A, the third length L in the vehicle longitudinal direction L of the reinforcing member shown in FIG. 25 1 were prepared two types of. As for the structure A ~ C, it was prepared in triplicate curvature radius of the bent portion. These Examples 8 through 19, load resistance evaluation test was performed. For test conditions were identical to Experimental Example 3 above, the description thereof is omitted.
[0148]
　Parameters related to the structure of the underrun protector according to Examples 8 through 19, and the maximum load ratio and the weight ratio of the underrun protector according to Examples 8 through 19 for the underrun protector according to Comparative Example 3 in Table 4 show.
[0149]
[Table 4]

[0150]
　As shown in Table 4, structure B has a higher load carrying capacity than the structure A. The structure C further higher load carrying capacity than the structure B. That is, according to this embodiment, in addition to providing a bent portion at the tip of the beam mounting surface of the connection structure, by providing the reinforcing plate inwardly of closed cross-section portion of the connecting structure, improved load bearing performance it can be seen that. In place of the reinforcing plate, by providing the partition member on the inside of the closed-section portion of the connecting structure, it can be seen that the load bearing performance is further improved. Incidentally, by applying the structure B and Structure C are both underrun protector believed further improved load bearing performance.
[0151]
　Further, as shown in Table 4, in the structure C, as the curvature radius of the bent portion is increased, the load-bearing performance is found to be further improved. In other words, if the out-of-plane deformation of the closed-section portion by a load input is effectively suppressed as the structure C, by increasing the curvature radius of the bent portion, it is possible to further improve the load carrying capacity.
[0152]
　Further, as shown in Examples 8 to Example 10 and Example 17 to Example 19 of Table 4, L 1 / L 2 as if the value of is large, the curvature radius of the bent portion is increased, the load bearing it can be seen that the performance is improved.
[0153]
　The third vehicle length L in the longitudinal direction L of the reinforcing member 1 in order to further verify the effect of, L 1 impact resistance evaluation test was conducted with varying. Figure 40 has a length L 1 length L in the vehicle longitudinal direction L of, and the reinforcing member mounting surface 2 is a graph showing the ratio of the relationship between the maximum load ratio of the conventional underrun protector. Furthermore, the curvature radius of the bent portion is 200 mm.
[0154]
　As shown in FIG. 40, L 1 / L 2 is in the case of 0.8 or more, load-bearing performance is significantly improved. Therefore, the third reinforcing member, L 1 / L 2 is preferably provided so as to satisfy ≧ 0.8. Such a finding was obtained for the first time by the present inventors.
[0155]
　As described above, according to the results of Experimental Example 3 and Experimental Example 4, underrun protector according to a third embodiment of the present invention, the conventional underrun protector in the vehicle width direction W than the mounting position of the beam when a load is given to the outer position, it has been shown to have excellent load carrying capacity.
[0156]
　(Experimental Example 5)
　Next, by using the underrun protector according to a fourth embodiment of the present invention, the underrun protector of the conventional structure were carried out load-bearing resistance evaluation test. The underrun protector of the conventional structure, it is underrun protector according to Comparative Example 1 above. Also, the underrun protector according to a fourth embodiment of the present invention, an underrun protector having the structure shown in FIG. 32 (Example 20). Beam, the tensile strength is formed by 780MPa grade high-tensile steel, the stay and the bracket has a tensile strength is formed a thick material 540MPa class. The first reinforcing member has a tensile strength is formed a thick material 780MPa class. The third reinforcing member has a tensile strength is formed a thick material 540MPa class.
[0157]
　Load resistance evaluation test, in the same manner as Example 2 to Example 4 above, against the indenter beam side portion of the outer position P2 in the vehicle width direction W than the stay mounting position shown in FIG. 2, the input load It was done by. Input position of the load, in the underrun protector according to Example 20 and Comparative Example 1, are both same. Then, in those resistant load evaluation test, pushing amount and the input load of the indenter was recorded. Based on the record, load bearing performance of the underrun protector according to Example 20 and Comparative Example 1 were evaluated. Incidentally, underrun protector according to Example 20 has the same configuration as underrun protector according to the first embodiment. That is, for load-bearing performance with respect to the input of load to the stay mounting position P1 shown in FIG. 2, the above experimental example Findings similar results shown in 1 can be obtained. Therefore, not described here for the load bearing evaluation test for underrun protector according to the present embodiment.
[0158]
　The maximum load ratio of underrun protector according to Example 20 for the underrun protector according to Comparative Example 1 shown in Table 5.
[0159]
[table 5]

[0160]
　According to underrun protector according to Example 20, against underrun protector according to Comparative Example 1, load resistance to thereby improve 130% or more. Thus, a first reinforcing member having a U-shaped cross section and, by applying the third reinforcing members disposed in bridging the beam mounting surface and the reinforcing member mounting surface compositely underrun protector, resistance it can be significantly improved load performance.
[0161]
　As described above, according to the results of this experimental example, underrun protector according to a fourth embodiment of the present invention, the conventional underrun protector on the outside of the position in the vehicle width direction W than the mounting position of the beam If the load applied for, it was shown to have a significantly better load-bearing.
[0162]
　Having described in detail preferred embodiments of the present invention with reference to the accompanying drawings, the present invention is not limited to such an example. It would be appreciated by those skilled in the relevant field of technology of the present invention, within the scope of the technical idea described in the claims, it is intended to cover various changes and modifications , also such modifications are intended to fall within the technical scope of the present invention.

WE claims

A beam extending in the vehicle width direction,
and a connection structure for connecting the beam to the body frame
with a
said beam, in a perpendicular cross section in the vehicle width direction,
the first top surface portion and the first lower surface facing and parts,
a first side portion for connecting one end of said first upper surface portion and the first lower surface portion,
at the other end of said first upper surface portion and the first lower surface portion, a vertical outward anda respective first flange portion formed so as to protrude,
is provided on the connection structure, the the protruding inwardly projecting portion disposed inwardly of the beam of the beam the first upper surface portion and the first lower surface portion, or with the connecting structure beam mounting member and the first flange portion provided on, by joining in at least one, the beam is the connection structure It is fixed to the body of the vehicle Part structure.
[Requested item 2]
　If the projecting portion to the connecting structure is provided, wherein the projecting portion, the projecting side portion opposite the first side surface portion is formed, the end structure of the vehicle according to claim 1 .
[Requested item 3]
　Beam mounting member is provided in the connecting structure, when said beam attachment member is fixed to the first flange portion,
　said beam attachment member, in a cross section perpendicular viewed in the vehicle width direction,
　a second opposing an upper surface portion and a second lower surface portion of
　the second side portion for connecting one end of the second upper surface portion and the second bottom surface portion,
　of the second upper surface portion and the second lower surface portion at the other end, the vertical direction outwardly and a second flange portion formed so as to protrude,
　with said first flange portion and the second flange portion is fixed, in claim 1 end structure of the vehicle according.
[Requested item 4]
　It said second side portion, the first is located inside the vehicle in the vehicle longitudinal direction relative to the flange portion, the end portion structure according to claim 3.
[Requested item 5]
　Said beam attachment member is provided in the connecting structure, when said beam attachment member is fixed to the first flange portion,
　a region facing at least the connecting structure of the opening of the beam in the vehicle width direction the provided first reinforcing member,
　by said beam and said first reinforcing member in a perpendicular cross section in the vehicle width direction closed section is formed, according to any one of claims 1 to 4, end structure of the vehicle.
[Requested item 6]
　Said first reinforcing member, in the vertical cross section in the vehicle width direction,
　and a first reinforcing member upper surface portion and the first reinforcing member lower surface portion opposing,
　the first reinforcing member upper surface portion and the first and a first reinforcing member side portions for connecting one end of the reinforcement member lower surface portion,
　the first reinforcing member is disposed inwardly of said beam, said first upper surface portion and the first reinforcing member and the upper surface portion is fixed, the first lower surface portion and said first reinforcement member lower surface portion is fixed, the end structure of the vehicle according to claim 5.
[Requested item 7]
　Wherein the first reinforcing member side portion, said first protrusion protruding with respect to the flange portion on the interior side of the vehicle longitudinal direction is formed, the end structure of the vehicle according to claim 6.
[Requested item 8]
　Wherein at least a portion of said first reinforcing member side portion comes into contact with the connecting structure, the end structure of the vehicle according to claim 7.
[Requested item 9]
　A second reinforcing member provided in a region facing at least the beam attachment member of the opening of the beam,
　the second reinforcing member, in the vertical cross section in the vehicle width direction,
　a second opposing a reinforcing member upper surface portion and the second reinforcing member lower surface portion,
　and a second reinforcing member side portions for connecting one end of said second reinforcing member upper surface portion and the second reinforcing member lower surface portion,
　the second reinforcing at the other end of the member upper surface portion and the second reinforcing member lower surface portion, and a second reinforcing member flange portion formed so as to protrude vertically outwardly
　said second reinforcing member is a beam disposed inwardly of,
　the second reinforcing member flange portion is fixed to the first side surface portion,
　the second reinforcing member side portion comes into contact with said beam attachment member, to claim 3 or 4 end structure of the vehicle according.
[Requested item 10]
　Said beam attachment member is provided in the connecting structure, said beam when the attachment member is fixed to the first flange portion,
　the connecting structure is provided to extend in the vertical direction structural body portion further comprising a,
　the beam attachment member,
　wherein the beam is mounted, and the beam mounting surface having a bent portion which is bent toward the interior side of the vehicle longitudinal direction to the end portion in the vehicle width direction outer side,
　the beam attachment in a plan view has a plane perpendicular to the plane, a body connecting surface attached to the structural body portion
　has,
　in plan view, at least as to bridge between said structural body portion beam mounting surface 1 one of the third reinforcing member is further provided, the end structure of the vehicle according to any one of claims 1-9.
[Requested item 11]
　The curvature of the bent portion radius of 50 ~ 200 mm, end structure of the vehicle according to claim 10.
[Requested item 12]
　The third vehicle longitudinal direction length L of the reinforcing member 1 and the vehicle front-rear direction length L of the surface which the third reinforcement members mounted in said structure body section 2 ratio L of 1 / L 2 is as it will be 0.8 or more, said third reinforcing member is provided, the end structure of the vehicle according to claim 10 or 11.
[Requested item 13]
　It said structure body portion has a U-shaped cross section having an opening provided in the vehicle width direction in a plan view,
　closed the horizontal cross section a closed section by the apparatus connection surface and the structure body portion cross section is further provided, the end structure of the vehicle according to any one of claims 10-12.
[Requested item 14]
　In the case where the third reinforcing members are provided more in the vertical direction,
　the inward of the closed cross-section portion, of the distal end portion of said third reinforcing member, in accordance with the position of the rear-side tip portion of the vehicle front-rear direction placed a reinforcing plate is provided,
　the reinforcing plate, the second is located in the most upward from the rear side end portion of the third reinforcing member located at the lowest side among the plurality of the third reinforcing member having 3 shaped to extend to the rear side distal end portion of the reinforcing member, the end structure of the vehicle according to claim 13.
[Requested item 15]
　In the horizontal cross section of the closed-section portion, the partition member so as to fill the inner space is provided in the closed-section portion,
　the partition member is combined to at least one of installation height of the third reinforcing member It is arranged Te, end structure of the vehicle according to claim 13 or 14.
[Requested item 16]
　End structure of the vehicle is underrun protector, end structure of the vehicle according to any one of claims 1 to 15.
[Requested item 17]
　A beam extending in the vehicle width direction, the beam and a connection structure for connecting the body frame,
　the connecting structure,
　and provided to extend in the vertical direction structural body portion,
　the beam the beam is attached a mounting member,
　comprising a
　said beam attachment member,
　wherein the beam is mounted, and the beam mounting surface having a bent portion which is bent toward the interior side of the vehicle longitudinal direction to the end portion in the vehicle width direction outer side,
　in a plan view the beam mounting surface to have a perpendicular surface, a body connecting surface attached to the structural body portion
　has,
　in a plan view, as to bridge between the beam mounting surface and the structure body portion At least one reinforcing member is further provided, the end structure of the vehicle.