Title of invention: Working machine
Technical field
[0001]
　The present invention relates to a working machine having a main body step and an auxiliary step for getting on and off the main body step.
Background technology
[0002]
　A tractor as an example of a working machine is provided with a steering wheel for steering, a driver's seat, and a driving unit having a main body step laid below the steering wheel (for example, Patent Document 1). The working machine of Patent Document 1 has an auxiliary step for getting on and off the main body step. The auxiliary step is fixed to an extension portion arranged on the side surface of the main body step.
Prior art literature
Patent documents
[0003]
Patent Document 1: Japanese Unexamined Patent Publication No. 2014-24485
Outline of the invention
[0004]
　The auxiliary step is a place where a load is repeatedly applied when getting on and off, and high connection strength is required. In the working machine of Patent Document 1, in order to further increase the connection strength, an auxiliary step is formed by a high-strength member such as a steel pipe material, and the auxiliary step is fixed to each of the driving part including the engine and the main body step. It is conceivable to do. However, when the auxiliary step made of a high-strength member such as a steel pipe material is fixed to the driving part and the main body step, the auxiliary step vibrates due to the vibration of the engine, and the vibration is transmitted to the main body step. Therefore, the ride quality of the driver may deteriorate.
[0005]
　In view of such circumstances, it is an object of the present invention to provide a working machine capable of increasing the connection strength of auxiliary steps while suppressing deterioration of ride quality of the driver.
[0006]
　The working machine according to the present disclosure includes a driving unit having a main body step on which a driver's foot is placed, an auxiliary step for getting on and off the driving unit, and a vehicle body arranged below the driving unit and having a driving unit. A working machine having a main body, the main body step, the auxiliary step, and a connecting member for connecting the vehicle body main body to each other, and the connecting member includes a first connecting portion connected to the vehicle body main body and the said. A plate-shaped support plate that connects the second connection portion connected to the auxiliary step, the third connection portion connected to the main body step, the first connection portion, the second connection portion, and the third connection portion. And an elastic member arranged between the support plate and the main body step.
[0007]
　The body body, body step, and auxiliary step can be connected to each other by a plate-shaped support plate. The connecting strength can be increased by integrally connecting the vehicle body body, the main body step, and the auxiliary step without connecting them by separate members. Therefore, the auxiliary step can be stably supported by the plate-shaped support plate without using a high-strength and expensive member such as a steel pipe material. Further, since the elastic member is arranged between the support plate and the main body step, when the auxiliary step vibrates due to the vibration of the vehicle body, the vibration of the auxiliary step is suppressed from being transmitted to the main body step via the support plate. it can. Therefore, it is possible to increase the connection strength of the auxiliary steps while suppressing the deterioration of the ride quality of the driver.
[0008]
　According to a preferred embodiment, the first connecting portion is connected to the side surface of the vehicle body body.
[0009]
　According to this aspect, the connecting member is connected to the side surface of the vehicle body body via the first connecting portion. Compared to the configuration in which the connecting member is connected to the lower surface of the vehicle body, the connecting member is less likely to come into contact with the ridges and trees on the ground. Therefore, the auxiliary step can be supported more stably.
[0010]
　According to a preferred embodiment, the support plate includes a first plate having the first connection portion, a second plate having the second connection portion, and a third plate having the third connection portion. However, at least the second plate extends in the vertical direction of the working machine.
[0011]
　According to this aspect, in the auxiliary step, a load is applied toward the ground side by getting on and off the driver or the like, and a load is applied downward. By arranging the second plate parallel to the load direction, it is possible to counter the load of the auxiliary step and secure the strength of the auxiliary step.
[0012]
　According to a preferred embodiment, at least two of the first plate, the second plate and the third plate are orthogonal to each other, and the first plate, the second plate and the third plate Are integrated by connecting means.
[0013]
　According to this aspect, the strength of the entire connecting member can be increased by the plates orthogonal to each other, and the connecting strength of the auxiliary step to the vehicle body can be further increased.
[0014]
　According to a preferred embodiment, the second plate has a fourth plate that connects one surface of the second plate and the vehicle body body, and the first plate is connected to an opposite surface of the second plate that is opposite to the one surface. Has been done.
[0015]
　According to this aspect, one surface of the second plate is connected to the vehicle body body by the fourth plate, and the opposite surface of the second plate is connected to the vehicle body body via the first plate. The strength of the second plate connected to the auxiliary step can be increased, and the connection strength of the auxiliary step to the vehicle body can be further increased.
[0016]
　According to a preferred embodiment, the auxiliary step comprises a horizontally long step on which the driver rests a foot, a first extension extending from one lateral end of the step, and a lateral step of the step. It has a second extending portion extending from the other end, the first extending portion is connected to the second plate, and the second extending portion is connected to the vehicle body body. ..
[0017]
　According to this aspect, one end of the auxiliary step in the lateral direction is connected to the vehicle body body via the second plate, and the other end of the auxiliary step in the lateral direction is connected to the vehicle body body via the second extension portion. To. Both ends of the step portion to which the load is applied can be supported by the vehicle body body, and the connection strength of the auxiliary step can be further increased.
[0018]
　According to a preferred embodiment, the main body step has a base member to which the connecting member is connected and an elastic cover member that covers the upper surface of the base member, and the elastic cover member is the upper surface of the base member. It has a cover portion that comes into contact with the cover portion, a protrusion portion that protrudes from the cover portion and engages with the hole portion of the base member, and the protrusion portion has a large diameter portion that is larger than the diameter of the hole portion. The base member has a small diameter portion having a diameter smaller than that of the large diameter portion, and the large diameter portion is arranged on the tip end side of the protruding portion with respect to the small diameter portion and penetrates the hole portion. Engage with the underside of.
[0019]
　According to this aspect, the base member and the elastic cover member are fitted by passing the large diameter portion of the protruding portion of the elastic cover member through the hole portion of the base member. Since the protruding portion of the elastic cover member and the hole portion of the base member engage with each other, a separate connecting member is not required. Therefore, it is possible to reduce the number of parts and the work man-hours.
[0020]
　According to a preferred embodiment, the hole portion of the base member is a burring hole in which the edge of the hole portion protrudes toward the elastic cover member.
[0021]
　According to this aspect, since the hole portion of the base member is a burring hole portion, the elastic cover member and the base member are easily fitted by the edge, and the fitted state is more difficult to come off.
A brief description of the drawing
[0022]
FIG. 1 is an overall perspective view of a working machine according to an embodiment.
FIG. 2 is a plan view of a main body step, an auxiliary step, and a connecting member.
FIG. 3 is a perspective view of the main body step, the auxiliary step, and the connecting member as viewed from below.
FIG. 4 is an exploded perspective view of a main body step and an auxiliary step when viewed from above.
FIG. 5 is an exploded perspective view of a main body step and an auxiliary step when viewed from below.
FIG. 6 is a perspective view of a main body step, an auxiliary step, and a connecting member in a state of being visually recognized from the lower left.
FIG. 7 is a diagram schematically showing a cross section of a main body step along the vertical direction.
FIG. 8 is a perspective view showing the rear surface of the working machine.
FIG. 9 is a perspective view of the protective frame.
FIG. 10 is a perspective view of a three-point link mechanism.
FIG. 11 is a diagram for explaining a support mode of the top link.
Mode for carrying out the invention
[0023]
　Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the description of the drawings below, the same or similar parts are designated by the same or similar reference numerals. However, it should be noted that the drawings are schematic and the ratio of each dimension is different from the actual one. Therefore, the specific dimensions, etc. should be determined in consideration of the following explanation. In addition, there may be parts in which the relationship and ratio of dimensions of the drawings are different from each other. In the present specification and drawings, elements having substantially the same function and configuration are designated by the same reference numerals to omit duplicate description, and elements not directly related to the present invention are not shown.
[0024]
　(1) Overall Outline Structure of Working Machine The working machine according to the
　present invention will be described with reference to the drawings as an embodiment adapted to a tractor as an example of the working machine. FIG. 1 is a perspective view of a working machine according to the present embodiment. The direction indicated by the arrow of reference numeral F in the drawing is the front side of the tractor, the direction indicated by the arrow of reference numeral L is the left side of the tractor, and the direction indicated by the arrow of reference numeral U is the upper side of the tractor.
[0025]
　As shown in FIG. 1, the tractor illustrated in the present embodiment includes a driving unit 1 located in the front half of the vehicle body, a front frame 2 supporting the driving unit 1, a housing unit 3 also serving as a rear frame, and a rear portion of the vehicle body. The boarding-type driving unit 4 located in, the left and right front wheels 5 located on the left and right of the driving unit 1, the left and right rear wheels 6 located on the left and right of the driving unit 4, and the left and right rear fenders 7 covering the left and right rear wheels 6. Etc. are provided.
[0026]
　As shown in FIG. 1, the driving unit 1 includes an engine 8 located at the rear of the driving unit 1, a cooling fan located in front of the engine 8 (not shown), and a radiator located in front of the cooling fan (not shown). ), A battery (not shown) located in front of the radiator, a swing-opening / closing bonnet 12 covering them, and the like.
[0027]
　The front frame 2 rotatably supports the left and right front wheel support members 13 that support the left and right front wheels 5. The housing unit 3 has an electro-hydraulic control type elevating unit (not shown) that elevates and drives the working device (not shown) via a link mechanism (not shown) for connecting the working device and a link mechanism at the rear portion. , And a PTO axis (not shown) that enables the extraction of working power to the working device. The driving unit 1, the front frame 2, and the housing unit 3 constitute the vehicle body body 10 of the present invention.
[0028]
　The driving unit 4 includes a steering wheel 23 for steering the front wheels, a speed change lever 24, a driver's seat 28 located between the left and right rear fenders 7, a main body step 50 on which the driver's foot is placed, and getting on and off the driving unit 4. Auxiliary step 60 for use. A protective frame 22 formed in an inverted U shape when viewed in the front-rear direction and a three-point link mechanism 40 (see FIG. 8) connected to the rear portion of the vehicle body so as to be vertically swingable are provided at the rear portion of the driving unit 4. There is. The protection frame 22 and the three-point link mechanism 40 will be described in detail later.
[0029]
　(2) Detailed Structure of Main Body Step, Auxiliary Step, and Connecting Member
　Next, the main body step, auxiliary step, and connecting member will be described in detail with reference to FIGS. 2 to 6. 2 to 5 show only the main body step, the auxiliary step, and the connecting member, and other parts are omitted. FIG. 2 is a plan view of the main body step, the auxiliary step and the connecting member, and FIG. 3 is a perspective view of the main body step, the auxiliary step and the connecting member as viewed from the front lower side.
[0030]
　The left and right ends on the front side of the main body step 50 are located in front of the left and right rear fenders 7. The rear side of the main body step 50 is inserted between the left and right rear fenders 7. The main body step 50 has a left-right central portion 50c located at the center in the left-right direction and a left-right side portion 50d located outside the left-right central portion 50c in the left-right direction. The left and right central portion 50c has a bulging portion that bulges upward with respect to the left and right side portions 50d. The left and right central portions 50c are bent and formed so as to bulge upward at the bulging portion. Due to this shape, the shape retention strength at the left and right central portions 50c is enhanced.
[0031]
　As shown in FIGS. 4 and 5, the main body step 50 has a base member 51 and an elastic cover member 52. 4 and 5 are exploded perspective views of the elastic cover member 52 of the main body step 50 separated. FIG. 4 is a view from above and from the left front side, and FIG. 5 is a view from below and from the left rear side. The base member 51 is made of metal, and the elastic cover member 52 is made of an elastic body such as rubber. The elastic cover member 52 covers the upper surface of the base member 51. Therefore, the upper surface 50a of the main body step 50 is composed of the upper surface 52a of the elastic cover member 52, and the lower surface 50b of the main body step 50 is composed of the lower surface 51b of the base member 51. A connecting member 70 is connected to the lower surface 51b of the base member 51.
[0032]
　An auxiliary step 60 is connected to at least one of the left and right side portions 50d of the main body step 50. The auxiliary step 60 of the present embodiment is connected to the left and right side portions 50d located on the left and right side portions of the working machine. The auxiliary step 60 is connected to the lower surface of the main body step 50. The auxiliary step 60 extends to the left side of the main body step 50 and extends to the front side of the main body step 50 in the plan view shown in FIG. The auxiliary step 60 is from a horizontally long step portion 63 on which the driver rests his / her foot, a first extending portion 61 extending from one end 63a of the step portion 63 in the lateral direction Y, and the other end 63b of the step portion 63 in the lateral direction Y. It has a second extending portion 62 that extends. The tread portion 63 has a rectangular shape having a long lateral Y length in a plan view. A plurality of hole portions 63x penetrating in the thickness direction are formed in the tread portion 63.
[0033]
　The first extending portion 61 and the second extending portion 62 are formed of a metal plate-shaped member. One end 61a of the first extension 61 is connected to one end 63a of the tread 63, and the other end 61b of the first extension 61 is connected to a second plate 752, which will be described later. The second extending portion 62 has a parallel portion 62c extending parallel to the first extending portion 61, and a bent portion 62d bent with respect to the parallel portion 62c. As shown in FIG. 4, one end 62a of the second extending portion 62 is provided in the parallel portion 62c and is connected to the other end 63b of the step portion 63. The other end 62b of the second extending portion 62 is provided at the bent portion 62d and is connected to the vehicle body body 10.
[0034]
　One end 63a of the step portion 63 in the lateral direction Y is connected to the vehicle body body 10 via the second plate 752, and the other end 63b of the step portion 63 in the lateral direction Y is connected to the vehicle body body body via the second extending portion 62. Connected to 10. Both ends of the step portion 63 to which the load is applied can be supported by the vehicle body body 10, and the connection strength of the auxiliary step 60 to the vehicle body body can be further increased.
[0035]
　The connecting member 70 connects the main body step 50, the auxiliary step 60, and the vehicle body main body 10 to each other. FIG. 6 shows a state in which the main body step 50 and the auxiliary step 60 are connected to the vehicle body main body 10 by the connecting member 70. Note that FIG. 6 shows only a part of the members of the vehicle body body 10.
[0036]
　The connecting member 70 has a first connecting portion 71, a second connecting portion 72, a third connecting portion 73, a support plate 75, and an elastic member 77. The first connecting portion 71 is a portion connected to the vehicle body body 10. Specifically, the first connecting portion 71 is fastened so as to engage with the first hole portion formed in the first plate 751 of the support plate 75 and the hole portion formed in the first hole portion and the vehicle body body 10. It is composed of a member 71f.
[0037]
　The second connecting portion 72 is a portion connected to the auxiliary step 60. Specifically, the second connecting portion 72 is fastened to engage with the second hole portion formed in the second plate 752 of the support plate 75, the second hole portion, and the hole portion formed in the auxiliary step 60. It is composed of a member 72f.
[0038]
　The third connection portion 73 is a portion connected to the main body step 50. Specifically, the third connecting portion 73 is fastened so as to engage with the third hole portion formed in the third plate 753 of the support plate 75, the third hole portion, and the hole portion formed in the main body step 50. It is composed of a member 73f.
[0039]
　The support plate 75 connects the first connecting portion 71, the second connecting portion 72, and the third connecting portion 73. The support plate 75 is made of a metal plate-shaped member. The vehicle body body 10, the main body step 50, and the auxiliary step 60 can be connected to each other by a plate-shaped support plate 75. The connecting strength can be increased by connecting the vehicle body body 10, the main body step 50, and the auxiliary step 60 in an integrated manner without connecting them by separate members. The auxiliary step 60 can be stably supported by the plate-shaped support plate 75 without using a high-strength member such as a steel pipe material.
[0040]
　The elastic member 77 is arranged between the main body step 50 and the support plate 75. Specifically, as shown in FIG. 6, the elastic member 77 is arranged between the base member 51 of the main body step 50 and the third plate 753 of the support plate 75. Since the elastic member 77 is arranged between the support plate 75 and the main body step 50, when the auxiliary step 60 vibrates due to the vibration of the vehicle body body 10, particularly the vibration of the engine 8, the vibration of the auxiliary step 60 is the support plate. It is possible to suppress transmission to the main body step 50 via 75. Therefore, deterioration of the ride quality of the driver can be suppressed.
[0041]
　The first connecting portion 71 of the connecting member 70 is connected to the side surface of the vehicle body body 10. That is, the connecting member 70 is connected to the side surface of the vehicle body 10 via the first connecting portion 71. Compared with the configuration in which the connecting member 70 is connected to the lower surface of the vehicle body 10, the connecting member 70 is less likely to come into contact with the ridges and trees on the ground. Therefore, the auxiliary step 60 can be stably supported.
[0042]
　The support plate 75 is configured by connecting the first plate 751, the second plate 752, and the third plate 753 to each other. The first plate 751 to the third plate 753 may be indirectly connected to each other and integrated, and may not be in direct contact with each other.
[0043]
　The first plate 751 has a first connecting portion 71. The first plate 751 is composed of a substantially rectangular plate-shaped member, and its surface extends in the vertical direction and the front-rear direction. One surface of the first plate 751 is in contact with the left surface of the vehicle body 10. The upper surface of the first plate 751 is connected to the reinforcing ribs provided on the lower surface of the main body step 50.
[0044]
　The second plate 752 has a second connecting portion 72. The second plate 752 is composed of a substantially rectangular plate-shaped member, and its surface extends in the vertical direction. The second plate 752 extends in the left-right direction and extends in the front-rear direction. One end of the second plate 752 is connected to the first plate 751, and the other end of the second plate is connected to the other end 61b of the first extending portion 61 of the auxiliary step 60. The first plate 751 and the second plate 752 intersect in a plan view.
[0045]
　As shown in FIG. 6, the second plate 752 extends in the vertical direction of the working machine. More specifically, the second plate 752 constitutes a wall portion extending in the vertical direction. The second plate 752 is connected to the auxiliary step 60, and a load is applied to the auxiliary step 60. In the auxiliary step 60, a load is applied toward the ground side when the driver gets on and off, and a downward load is applied. By arranging the second plate 752 in parallel with the load direction, it is possible to counter the load of the auxiliary step 60 and secure the reinforcing strength of the auxiliary step 60. The first plate 751 and the fourth plate 754 of the present embodiment form a wall portion extending in the vertical direction. Therefore, the first plate 751 and the fourth plate 754 can also withstand the load applied toward the ground side, and the strength of the connecting member can be increased.
[0046]
　The third plate 753 has a third connection portion 73. The third plate 753 is composed of a substantially rectangular plate-shaped member, and its surface extends in the plane direction (front-rear direction and width direction). The third plate 753 is arranged along the lower surface of the base member 51. One end of the third plate 753 is connected to the second plate 752, and the other end of the third plate is connected to the fourth plate 754. The side surface of the third plate 753 and the surface of the second plate 752 are orthogonal to each other, and the side surface of the third plate 753 and the surface of the fourth plate 754 are orthogonal to each other.
[0047]
　As described above, at least two of the first plate 751, the second plate 752 and the third plate 753 are orthogonal to each other, and the first plate 751, the second plate 752 and the third plate 753 are connected to each other. It is integrated by means. The connecting means may be welded or may be a fastening member having bolts and nuts. The strength of the entire connecting member 70 can be increased by the plates orthogonal to each other, and the connecting strength of the auxiliary step 60 can be further increased. Further, in another form, the first plate 751, the second plate 752, and the third plate 753 may be composed of one plate-shaped member.
[0048]
　The support plate 75 may have a fourth plate 754. The fourth plate 754 connects the second plate 752 and the vehicle body body 10. More specifically, the second plate 752 has a pair of surfaces forming a wall portion extending in the vertical direction. The pair of faces has one face and the opposite face. One surface of the second plate 752 is connected to the vehicle body body 10 by the fourth plate 754. The opposite surface of the second plate 752 is the surface opposite to one surface and is connected to the first plate 751. One surface of the second plate 752 is connected to the vehicle body 10 by the fourth plate 754, and the opposite surface of the second plate 752 is connected to the vehicle body 10 via the first plate 751. By connecting the second plate 752 connected to the auxiliary step 60 to the vehicle body body, the strength of the second plate can be increased, and the connecting strength of the auxiliary step 60 can be further increased.
[0049]
　The fourth plate 754, the second plate 752, and the third plate 753 are connected to each other at three points of connection and are arranged in a substantially triangular shape. Specifically, the fourth plate is connected to the second plate and the third plate, the second plate is connected to the third plate and the fourth plate, and the fourth plate is connected to the third plate and the second plate. It is connected. According to such a configuration, the rigidity of the connecting member 70 becomes higher, and the connecting strength of the auxiliary step 60 can be further increased.
[0050]
　Next, the engagement structure between the base member 51 and the cover member constituting the main body step 50 will be described. FIG. 7 is a diagram schematically showing a cross section of the main body step 50 along the vertical direction. As described above, the main body step 50 has a base member 51 to which the connecting member 70 is connected, and an elastic cover member 52 that covers the upper surface of the base member 51. The elastic cover member 52 has a cover portion 521 that abuts on the upper surface of the base member 51, and a protruding portion 522 that protrudes from the cover portion 521 and engages with the hole portion 52x of the base member 51. The cover portion 521 extends in the plane direction (front-rear direction and left-right direction) along the base member 51. A plurality of protrusions 522 are provided at intervals. The protruding portion 522 is provided at a position corresponding to the hole portion 51x of the base member 51.
[0051]
　The protruding portion 522 has a large diameter portion 522b that is larger than the diameter of the hole portion 51x of the base member 51, and a small diameter portion 522s that is smaller in diameter than the large diameter portion 522b. The large diameter portion 522b is arranged closer to the tip end side of the protruding portion 522 than the small diameter portion 522s. As an operation of engaging the protruding portion 522 of the elastic cover member 52 configured in this way with the hole portion 51x of the base member 51, for example, the protruding portion 522 of the elastic cover member 52 is brought into contact with the upper surface of the base member 51. The elastic cover member 52 is pressed toward the base member 51. As a result, the protruding portion 522 of the elastic cover member 52 is elastically deformed, and the large diameter portion 522b inserts the hole portion 51x. By pressing the elastic cover member 52 until the small diameter portion 522s located closer to the base portion than the large diameter portion 522b is located in the hole portion, the large diameter portion 522b engages with the lower surface of the base member 51.
[0052]
　According to such a configuration, the base member 51 and the elastic cover member 52 are engaged with each other by penetrating the large diameter portion 522b of the protruding portion 522 of the elastic cover member 52 through the hole portion 51x of the base member 51. Since the protruding portion of the elastic cover member 52 and the hole portion of the base member 51 engage with each other, a separate connecting member 70 is not required, and the number of parts can be reduced and the work man-hours can be reduced.
[0053]
　The hole 51x of the base member 51 may be a burring hole in which the edge of the hole 51x projects toward the elastic cover member 52. Since the hole portion 51x of the base member 51 is a burring hole portion, the elastic cover member 52 and the base member 51 are easily fitted by the edge of the hole portion 51x, and the fitted state is more difficult to come off.
[0054]
　(3) Detailed structure of the protective frame
　FIG. 8 is a perspective view showing the rear surface of the working machine. FIG. 8 shows members such as the protective frame 22 and the three-point link mechanism described later, and some members are omitted. A protective frame 22 is provided on the rear surface of the work machine. FIG. 9 is a perspective view of the protective frame 22. The protection frame 22 is a member for protecting the driver when the work machine falls or the like. As shown in FIG. 8, the protective frame 22 is provided inside the pair of rear wheels 6 in the left-right direction and outside the driver's seat 28 in the left-right direction.
[0055]
　As shown in FIG. 9, the protective frame 22 has a pair of pillar portions 221 extending in the vertical direction and a beam portion 222 connecting the pillar portions 221. The pillar portions 221 are arranged at intervals in the left-right direction, and the beam portion 222 extends in the left-right direction to connect the pair of pillar portions 221. The pair of column portions 221 and beam portions 222 form an inverted U shape in front and rear views.
[0056]
　One of the pair of pillars 221, one of the pillars 221a, is provided with a tool box 223 for storing tools. The tool box 223 has a lid 224 that can be opened and closed. The driver can open and close the lid 224 to put in and take out tools. Further, a storage jig 225 for storing a wrench as a tool is provided on the other pillar portion 221b of the pair of pillar portions 221. The storage jigs 225 are arranged at intervals in the vertical direction. Each of the storage jigs is formed with a hole 225x penetrating in the vertical direction. The opening area of ​​the hole 225x is larger than the cross-sectional shape of the wrench grip. The wrench grip is stored in the hole 225x. The length of the hole 225x in the left-right direction is shorter than the length of the head of the wrench. Therefore, when the grip of the wrench is stored in the hole 225x, the head of the wrench is caught by the storage jig 225, and the storage jig 225 can hold the wrench. Unlike the tool box 223, the storage jig 225 does not require opening and closing work of the lid portion. Therefore, the driver can easily store and remove the tool from the outside of the work machine.
[0057]
　More preferably, an elastic member such as rubber is provided on the inner surface of the hole 225x. It is possible to suppress the vibration of the tool in the storage jig due to the vibration of the work machine. Further, by providing the elastic member on the inner surface of the hole portion, it is possible to suppress the collision between the tool and the storage jig, and it is possible to suppress the tool from unintentionally falling from the storage jig and the generation of collision noise.
[0058]
　(4) Detailed Structure of the
　Three-Point Link Mechanism The three-point link mechanism 40 is arranged on the rear surface side of the working machine, and is configured so that a working device such as a traction type tilling device can be attached. FIG. 10 is an enlarged perspective view of the three-point link mechanism 40. The three-point link mechanism 40 has a top link 41 and a support 43. The support 43 rotatably supports the top link 41 around the shaft portion 41a of the top link 41. The support 43 of the present embodiment is configured to be able to support the top link 41 at different angles. The support 43 has at least a pair of brackets 431, a first engaging piece 433, a second engaging piece 434, and a holding member 435. The pair of brackets 431 are arranged at intervals in the left-right direction. The pair of brackets 431 are formed with bracket hole portions 431x through which the shaft portion 41a of the top link 41 is inserted. A plurality of bracket hole portions 431x are provided at intervals in the vertical direction. Specifically, the bracket hole portion 431x has an upper bracket hole portion 431xa, a middle bracket hole portion 431xb, and a lower bracket hole portion 431xc.
[0059]
　The shaft portion 41a of the top link 41 is inserted through the bracket hole portion 431x of the pair of brackets 431. The first engaging piece 433 is connected to one end edge (left end edge in the present embodiment) of the shaft portion 41a of the top link 41 in the left-right direction. The first engaging piece 433 is not connected to the other end edge of the shaft portion 41a of the top link 41 in the left-right direction, and can be inserted and removed from the bracket hole portion 431x.
[0060]
　The first engaging piece 433 is larger than the bracket hole portion 431x and restricts the movement of the shaft portion 41a inserted through the bracket hole portion 431x along the axial direction (movement to the right in the present embodiment). The first engaging piece 433 is locked to the second engaging piece 434 provided on the side surface (outer surface in the left-right direction) of the bracket 431. As shown in FIG. 9, the first engaging piece 433 has a rectangular parallelepiped shape, and the side surface of the first engaging piece 433 is locked to the second engaging piece 434.
[0061]
　The first engaging piece 433 is connected to a holding member 435 that holds the arm portion 41b of the top link 41. When the working device is connected to the top link 41, the arm portion 41b of the top link 41 is subjected to the force in the X direction shown in FIG. By applying a force in the X direction to the arm portion 41b, a force is also applied to the holding member 435 to move in the X direction around the first engaging piece 433. At this time, since the side surface of the first engaging piece 433 and the second engaging piece 434 are in contact with each other, the first engaging piece 433 does not rotate in the X direction. Therefore, the angle of the arm portion 41b of the top link 41 is maintained in a state where the side surface of the first engaging piece 433 and the side surface of the second engaging piece 434 are engaged.
[0062]
　A plurality of second engaging pieces 434 are provided at intervals in the vertical direction. Specifically, the second engaging piece 434 has an upper second engaging piece 434a, a middle second engaging piece 434b, and a lower second engaging piece 434c. The upper second engaging piece 434a engages with the first engaging piece 433 in a state where the shaft portion 41a of the top link 41 is inserted into the upper bracket hole portion 431xa. The upper second engaging piece 434a is arranged on the front side of the upper bracket hole portion 431xa. FIG. 11 is a diagram for explaining a support mode of the top link. FIG. 11A shows a state in which the first engaging piece 433 and the upper second engaging piece 434a are engaged with the shaft portion 41a of the top link 41 inserted into the upper bracket hole portion 431xa. ..
[0063]
　The middle second engaging piece 434b engages with the first engaging piece 433 in a state where the shaft portion 41a of the top link 41 is inserted into the middle bracket hole portion 431xb. The middle second engaging piece 434b is arranged below the middle bracket hole portion 431xb. FIG. 11B shows a state in which the first engaging piece 433 and the middle second engaging piece 434b are engaged with the shaft portion 41a of the top link 41 inserted into the middle bracket hole portion 431xb. ..
[0064]
　The lower second engaging piece 434c engages with the first engaging piece 433 in a state where the shaft portion 41a of the top link 41 is inserted into the lower bracket hole portion 431xc. FIG. 11C shows a state in which the first engaging piece 433 and the lower second engaging piece 434c are engaged with the shaft portion 41a of the top link 41 inserted into the lower bracket hole portion 431xc. .. The lower second engaging piece 434c is arranged on the lower rear side of the lower bracket hole portion 431xc.
[0065]
　As described above, the support 43 of the top link 41 of the present embodiment supports the top link 41 at different angles because the position of the second engaging piece 434 in the vertical direction and the position with respect to the bracket hole portion 431x are different. Can be done. In addition, the angle at which the top link 41 is supported can be changed by selecting the side surface that abuts on the second engaging piece 434 from the four side surfaces of the first engaging piece 433.
[0066]
　Although the present invention has been described in detail using the above-described embodiments, it is clear to those skilled in the art that the present invention is not limited to the embodiments described in the present specification. The present invention can be implemented as modifications and modifications without departing from the spirit and scope of the present invention as defined by the claims. Therefore, the description of the present specification is for the purpose of exemplification and does not have any limiting meaning to the present invention.
[0067]
　The entire contents of Japanese Patent Application No. 2018-117262 filed on June 20, 2018 are incorporated herein by reference.
Industrial applicability
[0068]
　It is possible to provide a work machine capable of increasing the connection strength of the auxiliary step while suppressing deterioration of the ride quality of the driver.
Code description
[0069]
1: Driving unit
4: Driving unit
10: Body body
22: Protective frame
28: Driver's seat
40: 3-point link mechanism
41: Top link
43: Support
50: Body step
51: Base member
52: Elastic cover member
521: Cover Part
522: Protruding part
522b: Large diameter part
522s: Small diameter part
60: Auxiliary step
61: First extending part
62: Second extending part
63: Stepping part
70: Connecting member
71: First connecting part
72: Second Connection part
73: Third connection part
75: Support plate
751: First plate
752: Second plate
753: Third plate
754: Fourth plate
77: Elastic member
Y: Lateral direction
The scope of the claims
[Claim 1]
　A work machine having 　a driving unit having a main body step on which a driver's foot is placed, an
　auxiliary step for getting on and off
the driving unit, and a vehicle body main body arranged below the driving unit and having a driving unit. The
　main body step, the auxiliary step, and a connecting member for connecting the vehicle body body to each other are provided, and the
　connecting member is
　connected to a first connecting portion connected to the vehicle body body and a second connecting member connected to the
　auxiliary step. A connecting portion, a
　third connecting portion connected to the main body step,
　a plate-shaped support plate connecting the first connecting portion, the second connecting portion, and the third connecting portion, and the
　supporting plate and the main body. A working machine, which has elastic members arranged between steps.
[Claim 2]
　The working machine according to claim 1, wherein the first connecting portion is connected to a side surface of the vehicle body body.
[Claim 3]
　The support plate includes a first plate having the first connection portion, a second plate having the second connection portion, and a third plate having the third connection portion, and
　at least the second plate. Is the work machine according to claim 1 or 2, which extends in the vertical direction of the work machine.
[Claim 4]
　At least two of the first plate, the second plate, and the third plate are orthogonal to each other, and
　the first plate, the second plate, and the third plate are integrated by a connecting means. The working machine according to claim 3.
[Claim 5]
　3. Claim 3 which has a fourth plate connecting one surface of the second plate and the vehicle body body, and
　the first plate is connected to an opposite surface of the second plate opposite to the one surface. Or the working machine according to 4.
[Claim 6]
　The auxiliary step
　extends from a horizontally long tread on which the driver rests, a first extension extending from one end of the
　tread in the lateral direction, and the other end of the tread in the lateral direction.
　Claimed
　from claim 3 , wherein the first extending portion has a second extending portion , the first extending portion is connected to the second plate, and the second extending portion is connected to the vehicle body body. Item 5. The working machine according to any one of Item 5.
[Claim 7]
　The main body step has
　a base member to which the connecting member is connected
　and an elastic cover member that covers the upper surface of the base member, and the elastic cover member has a
　cover portion that comes into contact with the upper surface of the base member. It has a protruding portion that protrudes from the cover portion and engages with the hole portion of the base member, and the protruding portion has a
　large diameter portion larger than the diameter of the hole portion and a smaller diameter portion than the large diameter portion. The
　large-diameter portion is arranged closer to the tip end side of the protruding portion than the small-diameter portion, and engages with the lower surface of the base member in a state of penetrating the hole portion. The working machine according to any one of claims 1 to 6.
[Claim 8]
　The working machine according to claim 7, wherein the hole portion of the base member is a burring hole in which the edge of the hole portion projects toward the elastic cover member side.