DESC:SUSPENSION FRAME STRUCTURE
TECHNICAL FIELD
[0001] The present disclosure, in general, relates to a suspension frame structure for a vehicle, and in particularly, a three box sheet metal suspension frame structure for supporting a suspension lower arm, an engine mount member, stabilizer bar and rack and pinion mount.
BACKGROUND
[0002] Background description includes information that may be useful in understanding the present invention.
[0003] Generally, the suspension frame is made in bow shape structure having an upper plate and a lower plate. The suspension frame is assembled to the vehicle body. The suspension frame receives suspension arms at both side, an engine mount member at middle, and stabilizer bar, and rack and pinion along with other components.
[0004] As shown in figs. 1a and 1b, the existing suspension frame structure 100 is made of two single sheet material, such as upper plate 101 and lower plate 102 that are joined along the peripheral edge to form the suspension frame structure 100. In between the upper plate 101 and the lower plate 102, a plurality of reinforcements 103, 104 are provided to strengthen the suspension frame structure. The suspension frame structure 100 comprises a central portion 100a along width of the vehicle and a pair of side-body members 100b, 100c provided at left and right end side of the central portion 100a.
[0005] The suspension frame suffers various loads in all direction, for example, in longitudinal, in lateral, and in vertical direction of the vehicle. For example, when a brake is applied or when a wheel falls into a pothole or when vehicle is taking a turn or during cornering. During braking or taking a turn, the side-body members’ front joint tends to move in lateral direction and central portion 100a is put into longitudinal deformation mode. Further, the central portion 100a receives an engine mount member which also put load on the central portion 100a in longitudinal direction. Further, uneven bumps also try to twist the suspension frame structure 100.
[0006] To increase rigidity and strength of the suspension frame under load conditions, several reinforcements are provided in between the upper plate and the lower plate. Further, a plurality of embosses and bead structures are provided on the structure.
[0007] Further, the two plates or two-piece suspension frame structure generate high wastage of sheet metals during cutting as single sheet material is to be cut into bow shape or curved shape. Further, the two plate suspension frame structure has poor stamping nesting efficiency due to uni-body structure.
[0008] The existing suspension frame structure has a plurality of reinforcement that increases cost and weight of the suspension frame.
[0009] In the view of the above-cited problems, there is a need for a suspension frame structure with high strength and rigidity during longitudinal, lateral and vertical loads while ensuring low cost and avoiding increase in weight of the structure.
[0010] Accordingly, there is a need for suspension frame structure that can overcome one or more limitations stated above or any other limitation associated with the conventional prior arts.
OBJECTS OF THE DISCLOSURE
[0011] Some of the objects of the present disclosure, which at least one embodiment herein satisfy, are listed hereinbelow.
[0012] It is a general object of the present disclosure to provide a three box shaped suspension frame structure with high rigidity and strength.
[0013] It is another object of the present disclosure to ensure easy stamping of the suspension frame structure.
[0014] It is another object of the present disclosure to provide lateral, longitudinal and vertical rigidity and strength to the suspension frame structure.
[0015] It is another object of the present disclosure to reduce wastage of raw material while manufacturing of the suspension frame structure.
[0016] These and other objects and advantages of the present invention will be apparent to those skilled in the art after a consideration of the following detailed description taken in conjunction with the accompanying drawings in which a preferred form of the present invention is illustrated.
SUMMARY
[0017] This summary is provided to introduce concepts related to a three box shaped suspension frame structure for a vehicle. The concepts are further described below in the detailed description. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter.
[0018] In an embodiment, the present disclosure relates to a suspension frame structure for a vehicle. The suspension frame structure includes a main body having an upper plate and a lower plate joined to each other along the lateral direction (Y1-Y2) to form the main body in a box shape. The suspension frame structure further includes a left side-body member and a right side-body member. Both the left side and the right side-body member include an upper plate and a lower plate joined to each other along longitudinal direction (X1-X2) to form a box shape left side-body member and a box shape right side-body member. The left side-body member and the right side-body member are joined to the main body at left side and right side, respectively, along lateral direction (Y1-Y2) to form the suspension frame.
[0019] In an aspect, a front end portion and a rear end portion of the upper plate are bent and extends in downward direction (Z2). Similarly, a front end portion and rear end portion of the lower plate are bent and extends in upward direction (Z1) and are joined with bent vertical portions of the upper plate to form the box shape main body structure.
[0020] In an aspect, the left side-body member and the right side-body member define a box type structure with a front end and a rear end in the longitudinal direction (X1-X2). The rear end is open curved shape end in lateral direction (Y1-Y2) and joined with the main body.
[0021] In an aspect, a flange of the upper plate and a flange of the lower plate of side-body members, at rear end, extend away from each other in longitudinal direction (X2) to receive the main body.
[0022] In an aspect, a flange portion of the upper plate of the left and right side-body members extend towards center of the main body in lateral direction (Y1-Y2) and configure to join with bent vertical wall portion of the upper plate of the main body at both ends-left and right.
[0023] In an aspect, a crescent type cut is provided at end of joining of the upper plate and the lower plate of the side-body members in between the flange portion and a bent vertical wall portion of the upper plate.
[0024] In an aspect, the flange portion of the upper plate of the left and right side-body members extend in downward direction (Z2) and joined with the bent vertical wall portion of the upper plate of the main body below joining line of the upper plate and the lower plate.
[0025] In an aspect, a flange portion of the lower plate of the left and right side-body members extend from rear end of the lower plate toward center of the main body in lateral direction (Y1-Y2) and configure to join with bottom surface of the lower plate of the main body at both ends.
[0026] In an aspect, a protrusion is provided on the lower plate of the main body below the crescent type cut of the upper plate and above the joining of the flange portion of the lower plate. The protrusion extends in longitudinal direction (X2).
[0027] In an aspect, the lower plate of the main body defines a bottom surface in between front and rear bent vertical wall portions. The bottom surface defines a jack receiving portion immediately below an engine mounting receiving pocket at center of the main body in between rack and pinion mounting holes, the jack receiving portion is defined by combination of a circular emboss at center and two irregular shape embosses.
[0028] In an aspect, a flange extends in longitudinal direction (X2) from the lower plate of the engine mount receiving pocket.
[0029] Various objects, features, aspects, and advantages of the inventive subject matter will become more apparent from the following detailed description of preferred embodiments, along with the accompanying drawing figures in which like numerals represent like components.
[0030] It is to be understood that the aspects and embodiments of the disclosure described above may be used in any combination with each other. Several of the aspects and embodiments may be combined to form a further embodiment of the disclosure.
[0031] The foregoing summary is illustrative only and is not intended to be in any way limiting. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features will become apparent by reference to the drawings and the following detailed description.

BRIEF DESCRIPTION OF THE DRAWINGS
[0032] The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate exemplary embodiments and, together with the description, serve to explain the disclosed principles. In the figures, the left-most digit(s) of a reference number identifies the figure in which the reference number first appears. The same numbers are used throughout the figures to reference like features and components. Some embodiments of system and/or methods in accordance with embodiments of the present subject matter are now described, by way of example only, and with reference to the accompanying figures, in which:
[0033] FIG. 1a and 1b illustrate suspension frame structure with upper plate and lower plate as known in the art;
[0034] FIG. 2 illustrates a top view of suspension frame structure with three-box body, such as main body, left side-body member, and right side-body member, in accordance with an embodiment of the present disclosure;
[0035] FIG. 3a illustrates the main body of the suspension frame structure of fig. 2, in accordance with an embodiment of the present disclosure;
[0036] FIG. 3b and 3c illustrate a left side-body member and a right side-body member, vice-versa of the suspension frame structure of fig. 2, in accordance with an embodiment of the present disclosure;
[0037] FIG. 4 illustrates a top view of lower plate of the main body with the left side-body member and the right side-body member, in accordance with an embodiment of the present disclosure;
[0038] FIG. 5a illustrates a perspective view of the suspension frame structure of the fig. 2, in accordance with an embodiment of the present disclosure;
[0039] FIG. 5b illustrates a cross section view of the suspension frame structure along line AA of fig. 5a, in accordance with an embodiment of the present disclosure;
[0040] Fig. 6a illustrates enlarged view of mounting of right side-body member with the main body, in accordance with an embodiment of the present disclosure;
[0041] Fig. 6b illustrates mounting of the right side-body member with the main body, as seen from front end of the fig. 2, in accordance with an embodiment of the present disclosure;
[0042] Fig. 6c illustrates mounting of the right side-body member with the main body, as seen from bottom of the fig. 2, in accordance with an embodiment of the present disclosure;
[0043] Fig. 7a illustrates bottom view of the suspension frame structure of fig. 2, in accordance with an embodiment of the present disclosure;
[0044] Fig. 7b illustrates positioning of jack plate on the main body of the suspension frame structure at bottom end, as seen from front end of the suspension frame of fig. 2, in accordance with an embodiment of the present disclosure;
[0045] Fig. 7c illustrates positioning of jack plate on the main body of the suspension frame structure at bottom end, as seen from rear end of the suspension frame of fig. 2, in accordance with an embodiment of the present disclosure;
[0046] Fig. 7d illustrates shape of an engine mounting member receiving pocket of the suspension frame structure, as seen from front end of the suspension frame structure of fig. 2, in accordance with an embodiment of the present disclosure; and
[0047] Fig. 7e illustrates shape of the engine mounting member receiving pocket of the suspension frame structure, as seen from front end bottom of the suspension frame structure of fig. 2, in accordance with an embodiment of the present disclosure.
[0048] It should be appreciated by those skilled in the art that any block diagrams herein represent conceptual views of illustrative systems embodying the principles of the present subject matter.
DETAILED DESCRIPTION
[0049] The detailed description of various exemplary embodiments of the disclosure is described herein with reference to the accompanying drawings. It should be noted that the embodiments are described herein in such details as to clearly communicate the disclosure. However, the amount of details provided herein is not intended to limit the anticipated variations of embodiments; on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the present disclosure as defined by the appended claims.
[0050] It is also to be understood that various arrangements may be devised that, although not explicitly described or shown herein, embody the principles of the present disclosure. Moreover, all statements herein reciting principles, aspects, and embodiments of the present disclosure, as well as specific examples, are intended to encompass equivalents thereof.
[0051] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments. As used herein, the singular forms “a",” “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises,” “comprising,” “includes” and/or “including,” when used herein, specify the presence of stated features, integers, steps, operations, elements and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and/or groups thereof.
[0052] It should also be noted that in some alternative implementations, the functions/acts noted may occur out of the order noted in the figures. For example, two figures shown in succession may, in fact, be executed concurrently or may sometimes be executed in the reverse order, depending upon the functionality/acts involved.
[0053] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which example embodiments belong. It will be further understood that terms, e.g., those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
[0054] As shown in the fig. 2, considering directions from center of the suspension frame structure 500, arrow X1-X2 indicates longitudinal (along vehicle length) direction where X1 indicates forward direction and X2 indicates rearward direction, arrow Y1-Y2 indicates lateral (along vehicle width) direction where Y1 indicates left side and Y2 indicates right side, arrow Z1-Z2 indicates vertical (along vehicle height) direction where Z1 indicates upward direction and Z2 indicates downward direction.
[0055] FIG. 2 illustrates top view of three-box shaped suspension frame structure 500. As shown in FIG. 2, the three-box shaped suspension frame structure 500 comprises a main body 200, a left side-body member 400, and a right side-body member 300 where the left side-body member 400 and the right side-body member 300 are attached with the main body 200 at left side and at right side, respectively, along lateral direction or along vehicle width direction to form the suspension frame structure 500.
[0056] The left side-body member 400 and the right side-body member 300 are joined with the main body 200 by various joining methods, such as arc welding. The main body 200 with the left side-body member 400 and the right side-body member 300 forms a substantially closed curved surface.
[0057] Referring to fig. 3a, an upper plate 201 of the main body 200, front end portion 201a at front end 205, and rear end portion 201b at rear end 206 of the upper plate 201 are bent and extend in downward direction ‘Z2’. On the other hand, for the lower plate 202 of the main body 200, front end portion 202a at front end 205 and rear end portion 202b at rear end 206 are bent and extend in upward direction ‘Z1’. The front end portion 201a of the upper plate 201 and the front end portion 202a of the lower plate 202 overlaps with each other and joined by joining means, such as arc welding. Similarly, the rear end portion 201b of the upper plate 201 and the rear end portion 202b of the lower plate 202 overlaps with each other and joined by joining means, such as arc welding.
[0058] In an embodiment, length of bent vertical portion of the front end portion 201a and the rear end portion 201b of the upper plate is more than the length of the bent vertical portion of the front end portion 202a and the rear end portion 202b of the lower plate 202. With the joining of the upper plate 201 and the lower plate 202, the main body 200 defines a box type structure having left end 203 and right end 204 that can be open end or close end. The upper plate 201 and the lower plate 202 are bent by pressing process in a press machine. Further, a plurality of embosses and bead structure provided on the upper plate 201 and the lower plate 202 to strengthen the suspension frame structure 500. The box type structure of the main body 200 defines an engine mount receiving structure 207 at center to support engine mounting. In an aspect, thickness of main body 200 is different than the thickness of the right side-body member 300 and the left side-body member 400.
[0059] Referring to fig. 3b illustrating right side-body member 300. The right side-body member 300 has an upper plate 301 and a lower plate 302 that are joined with each other along longitudinal direction ‘X1-X2’ to form a box type structure with a front end 303 and a rear end 304. The upper plate 301 is bent and extended in downward direction along longitudinal direction X1-X2 to define a channel. Similarly, the lower plate 302 is bent and extended in upward direction along longitudinal direction X1-X2 to define a channel. The bent portions 301c at both ends of the upper plate 301 overlaps the bent portions 302c of the lower plate 302 at both sides and are joined by joining means, such as arc welding. In an embodiment, the bent vertical portions 301c of the upper plate 301 has more vertical height as compared to the bent vertical portions 302c of the lower plate 302.
[0060] At rear end 304 of the box type structure of the right side-body member 300, a flange 301a of the upper plate 301 and a flange 302a of the lower plate 302 extend away from each other in vertical direction ‘Z1-Z2’ to receive the main body 200. Referring to fig. 5a and 5b, the flange 301a of the upper plate 301 of side-body member is joined on top surface 201c of the upper plate 201 of the main body 200 and the flange 302a of the lower plate 302 is joined on the bottom surface 202c of the lower plate 202 of the main body 200. The bent vertical wall portion (combination of 201a+202a) defined by the bent vertical portions of the upper plate 201 and the lower plate 202, by virtue of its structure, acts as a reinforcement in between the joining of the upper plate 301 and the lower plate 302 of the right side-body member 300.
[0061] Referring back to fig. 3b, a flange 301b extends outwardly from end of the bent vertical portion 301c of the upper plate 301. In the assembled suspension frame structure 500 as shown in fig. 5a and 6a, the flange 301b extends towards center of the main body 200 in lateral direction Y1. The flange 301b is configured to join with the vertical bent portion of front end portion 201a of the upper plate 201 of the main body 200 by joining means, such as arc welding. On the opposite end in vertical direction of the flange 301b, a flange portion 302b extends outwardly away from the lower plate 302 of side-body member. In the assembled suspension frame structure 500 as shown in fig. 5a and 6a, the flange 302b extends towards center of the main body 200 in lateral direction ‘Y1’. The flange 302b is configured to join with bottom surface 202c of the lower plate 202 of the main body 200 by joining means, such as arc welding.
[0062] Referring to fig. 6b and Fig. 3b together, a crescent type cut 301d is provided at end of the bent vertical portion 301c of the upper plate 301. The crescent type cut 301d is provided at local area to increase load share onto the sheet metal and to reduce load on welding of the left side-body member 300 and the main body 200. Further, the crescent type cut 301d is provided at the end the joining of the upper plate 301 and the lower plate 302. To clearly illustrate, it can be assumed that the crescent type cut 301d is provided in between the flange portion 301b and the bent vertical portion 301c of the upper plate 301. The flange portion 301b extend in downward direction ‘Z2’ after the end of the crescent type cut 301d and joined with the bent vertical portion of front end portion 201a of the upper plate 201 of the main body 200. The lower portion of the flange portion 301b which is towards the joining line ‘L1’ of the upper plate 201 and the lower plate 202 of the main body 200 is joined with the bent vertical portion of front end portion 201a below joining line ‘L2’ of the upper plate 301 and the lower plate 302 of the right side-body member 300. The joining line ‘L2’ of the upper plate 301 and the lower plate 302 of the right side-body member 300 is above at a distance ‘d’ from joining line ‘L3’ of the lower portion of the flange portion 301b and the bent vertical portion of front end portion 201a of the main body 200. The load path level difference ‘d’ is provided to increase load share onto the sheet metal of the upper plate 201 of the main body and reduce load on the welding to avoid breaking of welding.
[0063] Referring to fig. 6c, a protrusion 202d is provided on lower plate 202 of the main body 200 extending in forward longitudinal direction X1. The protrusion 202d is provided below the crescent type cut 301d of the upper plate 301 and above the joining of the flange portion 302b of the lower plate 302. The protrusion 202d is provided to increase weld length so that loads on welding can be reduced within limited available space, i.e., joining of the right side-body member 300 and the main body 200.
[0064] Similarly, on left hand side also, a protrusion 202d (as shown in figure 7b) is provided below the crescent type cut 401d (as shown in figure 7b) of the upper plate 401 and above the joining of the flange portion 402b of the lower plate 402. The protrusion 202d is provided to increase weld length so that loads can be transferred easily without creating stress at one point, i.e., joining of the left side-body member 400 and the main body 200.
[0065] Referring to fig. 3c that illustrates left side-body member 400 which is similar to the right side-body member 300. Only orientation of the left side-body member 400 differs with the right side-body member 300. The right side-body member 300 is attached/joined with the main body 200 at right side of vehicle, and the left side-body member 400 is joined with the main body 200 at left side of vehicle.
[0066] Referring to fig. 3c, the left side-body member 400 has an upper plate 401 and a lower plate 402 that are joined with each other along longitudinal direction ‘X1-X2’ to form a box type structure with front end 403 and a rear end 404. The upper plate 401 is bent and extended in downward direction along longitudinal direction ‘X1-X2’ to define a channel. Similarly, the lower plate 402 is bent and extended in upward direction along longitudinal direction ‘X1-X2’ to define a channel. The bent portions 401c at both ends (right hand and left hand along longitudinal direction) of the upper plate 401 overlaps the bent portions 402c of the lower plate 402 at both ends (right hand and left hand along longitudinal direction) and joined by joining means, such as arc welding. In an embodiment, the bent vertical portions 401c of the upper plate 401 has more vertical height as compared to the bent vertical portion 402c of the lower plate 402.
[0067] At rear end 404 of the box type structure of the left side-body member 400, a flange 401a of the upper plate 401 and a flange 402a of the lower plate 402 extend away from each other in vertical direction ‘Z1-Z2’ to receive the main body 200. Referring to fig. 5a and 5b, Fig. 4, and 7a, 7b, together with fig. 3c, the flange 401a of the upper plate 401 is joined to top surface 201c of the upper plate 201 of the main body 200 and the flange 402a of the lower plate 402 is joined to the bottom surface 202c of the lower plate of the main body 200. The bent vertical wall portion (combination of 201a+202a) defined by the bent vertical portions of the upper plate 201 and the lower plate 202 by virtue of its structure, acts as a reinforcement in between the joining of the upper plate 401 and the lower plate 402 of the left side body member 400.
[0068] Referring back to fig. 3c, a flange 401b extend outwardly away from end of the bent vertical portion 401c of the upper plate 401 at rear end 404. In the assembled suspension frame structure 500 as shown in fig. 5a and 6a, the flange 401b extend towards center of the main body 200 in lateral direction Y2. The flange 401b is configured to join with the vertical bent portion of front end portion 201a of the upper plate 201 of the main body by joining means, such as arc welding. On the opposite end in vertical direction of the flange 401b, a flange portion 402b extend outwardly away in lateral direction from the lower plate 402. In the assembled suspension frame structure 500 as shown in fig. 5a and 6a, the flange 402b extend towards center of the main body 200 in lateral direction ‘Y2’. The flange 402b is configured to join with bottom surface 202c of the lower plate 202 of the main body 200 by joining means, such as arc welding.
[0069] Referring to fig. 6b and Fig. 3c together, a crescent type cut (not mentioned in figure, however, it can be deduced from the same as 301d of figure 6b) is provided at end of the bent vertical portion 401c of the upper plate 401. The crescent type cut is provided at local area to increase load share onto the sheet metal and to reduce load on welding of the left side-body member 400 and the main body 200. Further, the crescent type cut is provided at the end the joining of the upper plate 401 and the lower plate 402. To clearly illustrate, it can be assumed that the crescent type cut is provided in between the flange portion 401b and the bent vertical portion 401c of the upper plate 401. The flange portion 401b extends in downward direction ‘Z2’ after the end of the crescent type cut 401d and joined with the bent vertical portion of front end portion 201a of the upper plate 201 of the main body 200. The lower portion of the flange portion 401b, which is towards the joining line ‘L1’ of the upper plate 201 and the lower plate 202 of the main body 200, is joined with the bent vertical portion of front end portion 201a below joining line ‘L2’ of the upper plate 401 and the lower plate 402 of the left side-body member 400. The joining line ‘L2’ of the upper plate 401 and the lower plate 402 of the left side-body member 400 is above at a distance ‘d’ from joining line ‘L3’ of the lower portion of the flange portion 401b and the bent vertical portion of front end portion 201a of the main body 200. The load path level difference ‘d’ is provided to increase load share onto the sheet metal of the upper plate 201 of the main body 200 and reduce load on the welding to avoid breaking of welding.
[0070] In an embodiment, a plurality of embosses and bead structures are provided on the upper plate and the lower plate of the right side-body member 300 and the left side-body member 400 to provide strength to the structure. Further, the right side-body member 300 and the left side-body member 400 of the main body 200 has a plurality of mounting points to receive component of the vehicle. For example, the right side-body member 300 and the left side-body member 400 receive the suspension arms at right and left side, respectively.
[0071] Referring Fig. 4, 7a, 7b, 7c, and 7d together, the upper plate 201 and the lower plate 202 of the main body 200 has a plurality of mounting points, such as an engine mounting point 208 and rack and pinion mounting point 209, 210. Each of the mounting point is strengthened by a circular emboss, which is extending in vertical upward direction ‘Z1’ (means inward the box structure of the main body). Further, owing to no reinforcements in main body, an emboss structure 211, 212 of a particular shape has been provided adjacent to the circular embosses to strengthen the structure. At the center of the main body 200 and under the engine mount receiving structure 207, on the bottom surface 202c that is defined in between the front bent portion 202a and the rear bent portion 202b of the lower plate 202 define a jack receiving portion 202d with the embosses 210, 211. Combination of the circular emboss at the engine mounting point 208 and the embosses 210, 211 adjacent to the circular emboss provide surface that extend in downward vertical direction Z2 (as seeing from top of the lower plate 202 in fig. 4) along the front end 205 and the rear end 206 of the lower plate 202 around the circular emboss and in between the embosses 210, 211 and the front end 205 and the rear end 206. Combination of embosses around the jack receiving area provide strength to the lower plate 202 and transfer loads through the bent vertical portions at front end 205 and the rear end 206 on main body and restrict bending of the lower plate during vertical loads.
[0072] Referring to fig. 7d and 7e, the engine mount receiving structure 207 is a cut-out structure provided at the bent vertical portion defined by joining of the upper plate 201 and the lower plate 202 at front end 205 to receive the engine mount. The engine mount receiving structure 207 weakens the center area of the main body 200 and can cause bending of the main body 200 at this point. To strengthen the engine mounting receiving structure 207, a flange 202f is provided on the lower plate 202. The flange 202f extend outward from the engine mounting receiving structure 207 along longitudinal direction X1-X2. The flange 202f reduces stress on trim of the engine mounting receiving structure 207.
[0073] With the present three-box structure of the suspension frame, each plate of each box is cut separately from a raw material, therefore, there is less material wastage during manufacturing. Further, with the small plates, stamping has been simplified. Further, overall strength of the suspension frame to cater all loads applied is equivalent to a single-plate structure. Furthermore, the present suspension frame structure does not require any reinforcement in between the main body. The bent vertical portions of the main body act as reinforcement to increase cross sectional rigidity of the structure to improve static and dynamic stiffness of the structure.
[0074] While the foregoing describes various embodiments of the invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof. The scope of the invention is determined by the claims that follow. The invention is not limited to the described embodiments, versions or examples, which are included to enable a person having ordinary skill in the art to make and use the invention when combined with information and knowledge available to the person having ordinary skill in the art.
[0075] Finally, the language used in the specification has been principally selected for readability and instructional purposes, and it may not have been selected to delineate or circumscribe the inventive subject matter. It is therefore intended that the scope of the invention be limited not by this description, but rather by any claims that issue on an application based here on. Accordingly, the embodiments of the present invention are intended to be illustrative, but not limiting, of the scope of the invention, which is set forth in the following claims.

,CLAIMS:We claim:
1. A suspension frame structure (500) comprising:
a main body (200) having an upper plate (201) and a lower plate (202) joined to each other along the lateral direction (Y1-Y2) to form the main body (200); and
a right side-body member (300) having an upper plate (301) and a lower plate (302) joined to each other along longitudinal direction (X1-X2) to form the right side-body member (300); and
a left side-body member (400) having an upper plate (401) and a lower plate (402) joined to each other along longitudinal direction (X1-X2) to form the left side-body member (400),
the right side-body member (300) and the left side-body member (400) joined to the main body (200) at right side and left side, respectively, along lateral direction (Y1-Y2) to form the suspension frame (500).

2. The suspension frame structure (500) as claimed in claim 1, wherein the main body (200) defines a box type structure with left end (203) and right end (204) in the lateral direction (Y1-Y2).
3. The suspension frame structure (500) as claimed in claim 1, wherein front end portion (201a) and rear end portion (201b) of the upper plate (201) are bent and extends in downward direction (Z2).
4. The suspension frame structure (500) as claimed in claim 1, wherein front end portion (202a) and rear end portion (202b) of the lower plate (202) are bent and extends in upward direction (Z1) and are joined with bent vertical portions of the upper plate (201).
5. The suspension frame structure (500) as claimed in claim 1, wherein the right side-body member (300) and the left side-body member (400) define a box type structure with a front end (303, 403) and a rear end (304, 404) in the longitudinal direction (X1-X2), the rear end (304, 404) is open curved end and joined with the main body (200).
6. The suspension frame structure (500) as claimed in claim 5, wherein flange (301a, 401a) of the upper plate (301, 401) and flange (302a, 402a) of the lower plate (302, 402) at the rear end (304, 404) extend away from each other in vertical direction to receive the main body (200).
7. The suspension frame structure (500) as claimed in claim 5, wherein a flange portion (301b, 401b) of the upper plate (301, 401) of the right and left side-body member (300, 400) extend toward center of the main body (200) in lateral direction (Y1-Y2) and configured to join with a bent vertical wall portion of front end portion (201a) of the upper plate (201) of the main body (200).
8. The suspension frame structure (500) as claimed in claim 5, wherein a crescent type cut (301d, 401d) is provided at end of joining of the upper plate (301, 401) and the lower plate (302, 402) in between the flange portion (301b, 401b) and a bent vertical wall portion (301c, 401c) of the upper plate (301, 401).
9. The suspension frame structure (500) as claimed in claim 7, wherein the flange portion (301b, 401b) of the upper plate (301, 401) of the right and left side-body member (300, 400) extend in downward direction (Z2) and joined with the bent vertical wall portion of front end portion (201a) of the upper plate (201) of the main body (200) below joining line ‘L2’ of the upper plate (301, 401) and the lower plate (302, 402).
10. The suspension frame structure (500) as claimed in claim 7, wherein a flange portion (302b, 402b) of the lower plate (302, 402) of the right and left side-body member (300, 400) extend from rear end (304, 404) of the lower plate (302, 402) toward center of the main body (200) in lateral direction (Y1-Y2) and configure to join with bottom surface (202c) of the lower plate (202) of the main body (200).
11. The suspension frame structure (500) as claimed in claim 8, wherein a protrusion (202d) is provided on the lower plate (202) of the main body (200) below a crescent type cut (301d, 401d) of the upper plate (301, 401) and above the joining of the flange portion (302b, 402b) of the lower plate (302, 402), the protrusion (202d) extend in forward longitudinal direction (X1).
12. The suspension frame structure (500) as claimed in claim 1, wherein the lower plate (202) of the main body (200) defines a bottom surface (202c) in between front and rear bent portions (202a, 202b), the bottom surface (202c) defines a jack receiving portion (202d) immediately below an engine mount receiving pocket (207) at center of the main body (200) in between rack and pinion mounting holes (208, 209), the jack receiving portion (202d) is defined by combination of a circular emboss (208) at center and two embosses (209, 210).