Rear frame for vehicle

Abstract

A rear frame for a vehicle may include: a pair of longitudinal portions spaced apart in a vehicle width direction; the first transverse part is connected with the front parts of the pair of longitudinal parts; and the second transverse part is connected with the rear parts of the pair of longitudinal parts, and each longitudinal part can be provided with a shock absorber seat for mounting a suspension shock absorber.

Description

Technical Field

[0001] The present invention relates to a rear frame for a vehicle, and more particularly, to a rear frame for a vehicle in which a longitudinal portion and a plurality of transverse portions are formed in an integral structure. Background Art

[0002] In recent years, with the increasing awareness of environmental and ore resource depletion crises, eco-friendly vehicles such as electric vehicles (EVs) and hybrid electric vehicles (HEVs) have gradually gained importance.

[0003] Electric vehicles have relatively heavy batteries and PE modules (Power Electronics modules), etc., thus their weight increases relatively, resulting in a contradictory problem that the collision energy increases while the collision energy absorption space relatively decreases. To overcome this problem, electric vehicles need to increase the firmness of the vehicle body by integrating the connection structure of the load path and save costs and simplify the assembly structure by minimizing the number of components as much as possible.

[0004] Electric vehicles use a rear frame at the rear of the vehicle body to reduce weight and enhance rigidity, etc., and the rear frame is an essential component for the vehicle body's collision performance and NVH (Noise, Vibration, Harshness) performance. The rear frame includes a pair of rear longitudinal beams and a plurality of cross beams connecting the pair of rear longitudinal beams.

[0005] However, in the rear frame of a conventional electric vehicle, the rear longitudinal beam and the cross beam are combined by mechanical fasteners such as SPR (Self-Piercing Rivet) and FDS (Flow Drill Screw), etc., thus there is a disadvantage of rigidity loss in the vehicle rear structure.

[0006] The matters described in this background art section are written to enhance the understanding of the background of the invention and may include matters of the prior art that are not known to those of ordinary skill in the art of this technology. Summary of the Invention

[0007] The present invention is proposed in view of the above problems, and its purpose is to provide a rear frame for a vehicle, in which a pair of longitudinal portions and a plurality of transverse portions are formed in an integral structure (unitary one-piece structure) by a casting process, thereby strengthening the rigidity of the vehicle rear structure.

[0008] To achieve the above object, the rear frame for a vehicle according to the present invention may include: a pair of longitudinal portions spaced apart in the vehicle width direction; a first transverse portion connecting the front portions of the pair of longitudinal portions; and a second transverse portion connecting the rear portions of the pair of longitudinal portions. The pair of longitudinal portions, the first transverse portion, and the second transverse portion form an integral structure, and each longitudinal portion may have a shock absorber seat for mounting a suspension shock absorber.

[0009] The shock absorber seat may be in the shape of a bag with a cavity open at the bottom.

[0010] Each longitudinal portion may include a front interior wall extending forward from the shock absorber seat toward the vehicle front and a rear interior wall extending rearward from the shock absorber seat toward the vehicle rear. The front interior wall and the rear interior wall may extend along the center line between the interior edge and the exterior edge of the longitudinal portion.

[0011] The rear interior wall may include a rear extension member mounting boss formed at its rear portion, and the front end of the rear extension member may be fixed to the rear extension member mounting boss by a fastener.

[0012] Each longitudinal portion may include a front mounting seat disposed on the bottom surface at its front portion and a rear mounting seat disposed on the bottom surface at its rear portion. The front mounting portion of the rear subframe may be mounted on the front mounting seat, and the rear mounting portion of the rear subframe may be mounted on the rear mounting seat.

[0013] The front mounting seat may be substantially circular, and the rear mounting seat may be substantially circular.

[0014] The shock absorber seat may be located between the front mounting seat and the rear mounting seat.

[0015] The front mounting seat may be formed at the lower edge of the front interior wall, and the rear mounting seat may be formed at the lower edge of the rear interior wall.

[0016] Each longitudinal portion may further include a front mounting boss located at the center of the front mounting seat, a front mounting device fixed to the front mounting boss, a rear mounting boss located at the center of the rear mounting seat, and a rear mounting device fixed to the rear mounting boss. Among them, the front mounting boss and the rear mounting boss may be aligned with the center line of each longitudinal portion.

[0017] It may further include a front recessed structure formed above the front mounting seat and a rear recessed structure formed above the rear mounting seat.

[0018] The front recessed structure may be in the shape of a substantially semi-circular bag, and the rear recessed structure may be in the shape of a substantially semi-circular bag.

[0019] The front recessed structure may be defined by the front interior wall and the front mounting seat, and the front recessed structure may have front reinforcing ribs extending from the front interior wall toward the interior of the vehicle.

[0020] The rear recessed structure may be defined by the rear interior wall and the rear mounting seat, and the rear recessed structure may have rear reinforcing ribs extending from the rear interior wall toward the interior of the vehicle.

[0021] The first lateral portion may include a plurality of seat side mounting bosses for mounting a seat mounting portion of a vehicle seat. Each seat side mounting boss may protrude upward from the first lateral portion, and a mounting device may be mounted in a corresponding mounting hole of the seat side mounting boss.

[0022] The plurality of seat side mounting bosses may be symmetrically arranged with respect to the central portion of the first lateral portion.

[0023] The first lateral portion may include a plurality of battery side mounting bosses for mounting a battery. Each battery side mounting boss may protrude downward from the first lateral portion, and a mounting device may be mounted in a corresponding mounting hole of the battery side mounting boss.

[0024] The plurality of battery side mounting bosses may be symmetrically arranged with respect to the central portion of the first lateral portion.

[0025] The first lateral portion may include a plurality of reinforcing ribs cross - connected to the plurality of battery side mounting bosses.

[0026] The second lateral portion may include a plurality of reinforcing ribs formed on its bottom surface.

[0027] Each longitudinal portion may include a plurality of reinforcing ribs formed on its bottom surface. The plurality of reinforcing ribs may include first reinforcing ribs extending along the length direction of each longitudinal portion and a plurality of second reinforcing ribs connecting the shock absorber seat and the first reinforcing ribs.

[0028] According to the present invention, a pair of longitudinal portions and a plurality of lateral portions are formed into a unitary one - piece structure by a casting process, thereby being able to strengthen the rigidity of the vehicle rear structure. In particular, a pair of longitudinal portions and a plurality of lateral portions form a unitary one - piece structure, so that there are no seams connected by welding, fasteners, brackets, stiffeners, etc. Therefore, the load can be evenly dispersed or transmitted through a pair of longitudinal portions and a plurality of lateral portions. In a traditional rear frame, fractures, damages, etc. may occur at the seams between the rear longitudinal beam and the cross beam, resulting in a reduction in its rigidity. In contrast, for the rear frame applying the present invention, since there are no seams between each longitudinal portion and the lateral portion, a reduction in the rigidity of the seam portion can be prevented. Not only can the mounting rigidity and input point rigidity of related components connected to the rear frame be fully ensured, but also the rear collision resistance strength can be further improved.

[0029] According to the present invention, as a single integrated structure is formed by a pair of longitudinal portions and a plurality of transverse portions, the number of components and the number of joints can be reduced, thus saving the manufacturing cost thereof.

[0030] According to the present invention, the front interior wall can extend from the shock absorber seat toward the front of the vehicle, and the rear interior wall can extend from the shock absorber seat toward the rear of the vehicle. The front interior wall and the rear interior wall can be integrally connected to the shock absorber seat, thereby strengthening the rigidity of the shock absorber seat. Thus, the load acting through the suspension shock absorber can be dispersed along the front interior wall and the rear interior wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A view showing a rear frame for a vehicle according to an embodiment of the present invention mounted on a rear structure of a vehicle.

[0032] Figure 2 A perspective view showing a rear frame for a vehicle according to an embodiment of the present invention.

[0033] Figure 3 A top view showing a rear frame for a vehicle according to an embodiment of the present invention.

[0034] Figure 4 A bottom view showing a rear frame for a vehicle according to an embodiment of the present invention.

[0035] Figure 5 As viewed from Figure 3 a side view in the direction of arrow A.

[0036] Figure 6 As taken along Figure 3 section line B-B.

[0037] Figure 7 As taken along Figure 5 section line C-C.

[0038] Figure 8 As taken along Figure 5 section line D-D.

[0039] Figure 9 As taken along Figure 5 section line E-E.

[0040] Figure 10 A bottom view showing a rear subframe mounted on a longitudinal portion of a rear frame for a vehicle according to an embodiment of the present invention.

[0041] Figure 11 As taken along Figure 10 section line F-F.

[0042] Figure 12A perspective view showing the front recessed structure of a rear frame for a vehicle according to an embodiment of the present invention.

[0043] Figure 13 A perspective view showing the rear recessed structure of a rear frame for a vehicle according to an embodiment of the present invention.

[0044] Description of reference numerals

[0045] 1: Central floor 2: First rear floor

[0046] 3: Second rear floor 4: Storage groove

[0047] 5: Rear panel 6: Longitudinal member

[0048] 7: Inner wheelhouse panel 8: Wheelhouse reinforcement

[0049] 9: Rear extension member 10: Rear frame

[0050] 11: Longitudinal portion 12: First transverse portion

[0051] 13: Second transverse portion 14: Support member

[0052] 15: Rear subframe 16: Suspension shock absorber

[0053] 21: Front upper wall 21a: Front interior wall

[0054] 22: Rear upper wall 22a: Rear interior wall

[0055] 23: Shock absorber seat 23a: Upper wall

[0056] 23b: Outer wall 23c: Inner wall

[0057] 23d: Bulging wall 23e: Cavity

[0058] 26: Outer flange 27: Channel portion

[0059] 27a: Inner wall 27b: Outer wall

[0060] 27c: Front wall 27d: Rear wall

[0061] 27e: Cavity 27f: Bottom wall

[0062] 28a: Front flange 28b: First inner horizontal wall

[0063] 28c: Second inner horizontal wall 28d: Inner vertical wall

[0064] 31: Front mounting seat 32: Rear mounting seat

[0065] 33: Front mounting device 34: Rear mounting device

[0066] 35: Front mounting boss 35a: Front reinforcing rib

[0067] 36: Rear mounting boss 36a: Rear reinforcing rib

[0068] 37: Front recessed structure 38: Rear recessed structure

[0069] 41: Upper wall 42: Vertical wall

[0070] 43: Lower wall 44: Recessed wall

[0071] 45: Bulging wall 46: Channel

[0072] 47: Front flange of the first transverse part 51: Mounting boss for the rear extension member

[0073] 52: Seat side mounting boss 53: Battery side mounting boss

[0074] 54: First mounting boss 55: Second mounting boss. Detailed Description of the Invention

[0075] Hereinafter, some embodiments of the present invention will be described in detail with reference to the exemplary drawings. It should be noted that when assigning reference numerals to the components in the drawings, for the same components, even if they are shown in different drawings, the same reference numerals are attached as much as possible. In addition, when describing the embodiments of the present invention, if it is determined that the detailed description of the relevant well-known structure or function will impede the understanding of the embodiments of the present invention, the detailed description thereof will be omitted.

[0076] When describing the components of the embodiments of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. Such terms are only used to distinguish the component from other components, and the nature, order, or sequence of the corresponding component is not limited by such terms. In addition, unless otherwise defined, all terms (including technical terms or scientific terms) used herein have the same meaning as generally understood by those skilled in the technical field to which the present invention belongs. Terms that are the same as those defined in the general dictionary should be interpreted as having the meaning consistent with the meaning in the context of the related art, and should not be interpreted as having an idealized or overly formal meaning, unless explicitly defined as having such a meaning in this application.

[0077] Refer to Figure 1, according to an embodiment of the present invention, the rear frame 10 may include: a pair of longitudinal portions 11 spaced apart in the vehicle width direction; a first transverse portion 12 connecting the front portions of the pair of longitudinal portions 11; and a second transverse portion 13 connecting the rear portions of the pair of longitudinal portions 11. The pair of longitudinal portions 11, the first transverse portion 12, and the second transverse portion 13 may be formed as an integral structure by a casting process. In the prior art, the rear frame is formed by independently manufacturing a pair of rear longitudinal beams, a first cross beam, and a second cross beam, and then the pair of rear longitudinal beams, the first cross beam, and the second cross beam are combined with each other by various fasteners. In contrast, the pair of longitudinal portions 11, the first transverse portion 12, and the second transverse portion 13 of the present invention form an integral structure, so there are no joints connected by welding, fasteners, brackets, stiffeners, etc., and the load can be evenly dispersed or transmitted through the pair of longitudinal portions and the plurality of transverse portions. In the traditional rear frame, fractures, damages, etc. may occur at the joints between the rear longitudinal beam and the cross beam, so its rigidity is reduced. On the contrary, since there are no joints between the longitudinal portions 11 and the transverse portions 12, 13 of the rear frame 10 of the present invention, the reduction of the rigidity of the joint portion can be prevented. Not only can the installation rigidity, input point rigidity, etc. of the related components connected to the rear frame 10 be fully ensured, but also the rear collision resistance strength can be further improved.

[0078] The rear frame 10 may be connected to the rear edge of the center floor 1 of the vehicle, and a pair of side beams 1a may be installed on both side edges of the center floor 1. A plurality of rear floors 2, 3, 4 may be installed on the rear frame 10. The plurality of rear floors 2, 3, 4 may include: a first rear floor 2 connected to the rear edge of the center floor 1; a second rear floor 3 located behind the first rear floor 2; and a storage well 4 located behind the second rear floor 3.

[0079] The front edge of the first rear floor 2 may be fixed to the rear edge of the center floor 1 by fasteners, welding, etc. A plurality of longitudinal members 6 may be fixed to the first rear floor 2 by fasteners, welding, etc., and the rear ends of the longitudinal members 6 may be fixed to the first transverse portion 12 by fasteners, welding, etc. The rear edge of the first rear floor 2 may be fixed to the front edge of the first transverse portion 12 by fasteners, welding, etc.

[0080] The second rear floor 3 may be installed between the pair of longitudinal portions 11, the first transverse portion 12, and the second transverse portion 13. The second rear floor 3 may be configured to be higher than the first rear floor 2. The front edge of the second rear floor 3 may be fixed to the first transverse portion 12 by fasteners, welding, etc., the rear edge of the second rear floor 3 may be fixed to the second transverse portion 13 by fasteners, welding, etc., and each side edge of the second rear floor 3 may be fixed to the corresponding longitudinal portion 11 by fasteners, welding, etc.

[0081] Refer to Figure 1, according to an embodiment of the present invention, the rear frame 10 may further include a support member 14 that extends in the longitudinal direction of the vehicle between the first lateral portion 12 and the second lateral portion 13. The front end of the support member 14 may be fixed to the middle portion of the first lateral portion 12, and the rear end of the support member 14 may be fixed to the middle portion of the second lateral portion 13. Thus, by connecting the first lateral portion 12 and the second lateral portion 13 in the longitudinal direction of the vehicle, the support member 14 can significantly strengthen the longitudinal rigidity of the rear frame 10. In addition, the support member 14 is installed across the first lateral portion 12 and the second lateral portion 13, so that the support member 14 can stably support the second rear floor 3.

[0082] The storage groove 4 may be recessed downward with respect to the second rear floor 3, and the front edge of the storage groove 4 may be fixed to the second lateral portion 13 by fasteners, welding, etc. A pair of rear extension members 9 may be fixed to both edges of the storage groove 4 by fasteners, welding, etc., and the rear panel 5 may be fixed to the rear edge of the storage groove 4 by fasteners, welding, etc.

[0083] A pair of inner wheelhouse panels 7 may be respectively installed on a pair of longitudinal portions 11. Each inner wheelhouse panel 7 may be fixed to the corresponding longitudinal portion 11 by fasteners, welding, etc.

[0084] Refer to Figure 2 , a pair of longitudinal portions 11 may be spaced apart in the vehicle width direction. Each longitudinal portion 11 may extend in the longitudinal direction of the vehicle to define both edges of the rear structure of the vehicle.

[0085] Each longitudinal portion 11 may include: a damper receptacle 23 for installing the suspension damper 16; a front upper wall 21 that extends forward from the damper receptacle 23 toward the vehicle front; and a rear upper wall 22 that extends rearward from the damper receptacle 23 toward the vehicle rear. The front end of each longitudinal portion 11 may be connected to the corresponding side beam 1a, and the rear end of each longitudinal portion 11 may be connected to the corresponding rear extension member 9.

[0086] Refer to Figure 4 , Figure 10 , and Figure 11, the shock absorber seat 23 can be bag-shaped with a cavity 23e that is open at the bottom. The upper part of a suspension shock absorber 16 such as a shock absorber can be received in the cavity 23e of the shock absorber seat 23, and the upper part of the suspension shock absorber 16 can be mounted in the cavity 23e of the shock absorber seat 23. The shock absorber seat 23 can include: an upper wall 23a; an outer wall 23b that extends downward from the outer edge of the upper wall 23a outdoors; an inner wall 23c that extends downward from the inner edge of the upper wall 23a indoors. The cavity 23e can be defined by the upper wall 23a, the outer wall 23b, and the inner wall 23c. The front end of the outer wall 23b can be connected to the front end of the inner wall 23c, and the rear end of the outer wall 23b can be connected to the rear end of the inner wall 23c. The shock absorber seat 23 can further include a raised wall 23d that bulges upward from the upper wall 23a.

[0087] The front end of the front upper wall 21 can be connected to the corresponding side beam 1a, and the rear end of the front upper wall 21 can be integrally connected to the front end of the shock absorber seat 23.

[0088] Refer to Figure 7 , the front inboard wall 21a is a vertical wall that extends vertically downward from the front upper wall 21, and the front inboard wall 21a can face the interior of the vehicle. The front inboard wall 21a can extend along the center line between the outer edge and the inner edge of the longitudinal portion 11. In particular, the front inboard wall 21a can extend along the center line of the shock absorber seat 23.

[0089] The front end of the rear upper wall 22 can be integrally connected to the rear end of the shock absorber seat 23. The rear end of the rear upper wall 22 can be integrally connected to the front end of the corresponding rear extension member 9. The rear upper wall 22 can have a rear portion 22b and an inner wall 22c that accommodate the front portion of the rear extension member 9.

[0090] Refer to Figure 8 , the rear inboard wall 22a can be a vertical wall that extends vertically downward from the rear upper wall 22, and the rear inboard wall 22a can face the interior of the vehicle. The rear inboard wall 22a can extend along the center line between the outer edge and the inner edge of the longitudinal portion 11. In particular, the rear inboard wall 22a can extend along the center line of the shock absorber seat 23.

[0091] As described above, the front inboard wall 21a can extend forward from the shock absorber seat 23 toward the vehicle, the rear inboard wall 22a can extend rearward from the shock absorber seat 23 toward the vehicle, and the front inboard wall 21a and the rear inboard wall 22a are integrally connected to the shock absorber seat 23, thereby strengthening the rigidity of the shock absorber seat 23. Thus, the load acting through the suspension shock absorber 16 can be dispersed along the front inboard wall 21a and the rear inboard wall 22a.

[0092] Referring to Figure 2 , each longitudinal portion 11 may further include a front flange 28a formed at the front of the front inner wall 21a of the front chamber, and the front flange 28a may extend horizontally from the front inner wall 21a of the front chamber. Each longitudinal portion 11 may include an outer flange 26, and the outer flange 26 extends along the outer edge of the front upper wall 21, the outer edge of the upper wall 23a of the shock absorber seat 23, and the outer edge of the rear upper wall 22. The inner wheelhouse panel 7 may be fixed to the outer flange 26 of each longitudinal portion 11, and the wheelhouse reinforcement 8 may be fixed to the middle portion of the inner wheelhouse panel 7 by fasteners, welding, etc. The wheelhouse reinforcement 8 may be in a channel shape bent along the upper surface and the inner surface of the inner wheelhouse panel 7. The wheelhouse reinforcement 8 may include a front wall facing the front of the vehicle, a rear wall facing the rear of the vehicle, and an inner wall facing the inside of the vehicle.

[0093] Referring to Figure 1 and Figure 2 , each longitudinal portion 11 may include a channel portion 27, and the channel portion 27 protrudes upward from the front upper wall 21 and the shock absorber seat 23. A part of the inner wheelhouse panel 7 and the lower end of the wheelhouse reinforcement 8 may be fixed to the channel portion 27 by fasteners, welding, etc.

[0094] Referring to Figure 3 and Figure 5 , the channel portion 27 may be in a bag shape including a cavity 27e with an open upper part. The channel portion 27 may include an inner wall 27a facing the inside of the vehicle, an outer wall 27b facing the outside of the vehicle, a front wall 27c facing the front of the vehicle, a rear wall 27d facing the rear of the vehicle, and a bottom wall 27f facing the lower part of the vehicle. The cavity 27e may be defined by the inner wall 27a, the outer wall 27b, the front wall 27c, the rear wall 27d, and the bottom wall 27f. The lower end of the wheelhouse reinforcement 8 may be fixed to the inner wall 27a, the front wall 27c, and the rear wall 27d of the channel portion 27 by fasteners, welding, etc. A part of the inner wheelhouse panel 7 may be fixed to the outer wall 27b of the channel portion 27 by fasteners, welding, etc.

[0095] Since the channel portion 27 is in a bag shape with an open upper part, there is the following problem: during the electrocoating of the rear frame 10, the electrocoating liquid may accumulate in the cavity 27e of the channel portion 27, and during the baking step of the electrocoating process, the electrocoating liquid accumulated in the cavity 27e of the channel portion 27 will be charred. To solve this problem, the channel portion 27 may have a through hole 71 formed in the bottom wall 27f, and the through hole 71 may be open to the outside of the channel portion 27. The electrocoating liquid is discharged through the through hole 71 of the channel portion 27, so as not to accumulate in the cavity 27e of the channel portion 27.

[0096] Each longitudinal portion 11 may further include: a first indoor horizontal wall 28b that horizontally extends toward the vehicle interior from the front indoor wall 21a, the indoor wall 23c of the shock absorber seat 23, and the rear indoor wall 22a; an indoor vertical wall 28d that vertically extends downward from the first indoor horizontal wall 28b; and a second indoor horizontal wall 28c that horizontally extends toward the vehicle interior from the indoor vertical wall 28d.

[0097] The first transverse portion 12 may be configured to connect the front portions of a pair of longitudinal portions 11 in the vehicle width direction. The front edge of the first transverse portion 12 may be fixed to the rear edge of the first rear floor 2, and the rear edge of the first transverse portion 12 may be fixed to the front edge of the second rear floor 3.

[0098] Refer to Figure 2 , the first transverse portion 12 may include: an upper wall 41; a vertical wall 42 that vertically extends downward from the front edge of the upper wall 41; and a lower wall 43 that extends toward the vehicle front from the lower end of the vertical wall 42. The height of the upper wall 41 may be the same as or similar to the height of the second transverse portion 13. The rigidity of the first transverse portion 12 may be enhanced by the upper wall 41, the vertical wall 42, and the lower wall 43.

[0099] Refer to Figure 2 and Figure 6 , the first transverse portion 12 may include: a recessed wall 44 that recesses toward the vehicle lower part from the lower wall 43; a plurality of raised walls 45 that bulge upward from the recessed wall 44; and a first transverse portion front flange 47 that is formed at the front edge of the recessed wall 44.

[0100] Refer to Figure 2 , the plurality of raised walls 45 may be adjacent to the front edge of the recessed wall 44, and the plurality of raised walls 45 are spaced apart in the vehicle width direction (i.e., the length direction of the first transverse portion 12), so that a plurality of channels 46 may be formed between the plurality of raised walls 45, and the upper surface of each channel 46 may be located in the same plane as the upper surface of the recessed wall 44. When the electrophoresis coating liquid flows into the recessed wall 44 during the electrophoresis coating of the rear frame 10, the electrophoresis coating liquid may be discharged to the outside through the plurality of channels 46, so that the electrophoresis coating liquid does not accumulate on the recessed wall 44.

[0101] The rear edge of the first rear floor 2 may be fixed to the first transverse portion front flange 47 and the front flange 28a of the longitudinal portion 11 by fasteners, welding, etc.

[0102] Refer to Figure 4 and Figure 5, each longitudinal portion 11 may include a front mounting seat 31 disposed on the bottom surface of its front portion and a rear mounting seat 32 disposed on the bottom surface of its rear portion. The front mounting portion 15a of the rear subframe 15 may be mounted on the front mounting seat 31, and the rear mounting portion 15b of the rear subframe 15 may be mounted on the rear mounting seat 32. The shock absorber seat 23 may be located between the front mounting seat 31 and the rear mounting seat 32.

[0103] The front mounting seat 31 can be integrally formed at a part of the lower edge of the front interior wall 21a. Refer to Figure 3 and Figure 4 , the front mounting seat 31 may be substantially circular, and the front interior wall 21a may cross the center line of the front mounting seat 31 or a line adjacent thereto. The front mounting seat 31 can be integrally connected to the front interior wall 21a.

[0104] Refer to Figure 7 , the front mounting seat 31 may be horizontally and flatly formed on the bottom surface of the lower edge of the front interior wall 21a. Each longitudinal portion 11 may include a front mounting boss 35 located at the center of the front mounting seat 31. The center line of the front mounting seat 31 may be aligned with the center line of the corresponding longitudinal portion 11. Therefore, the front mounting boss 35 may be aligned with the center line of the front seat 31 and the center line of the corresponding longitudinal portion 11. The front mounting boss 35 may be formed at the lower part of the front portion of the front interior wall 21a, and the front mounting boss 35 may vertically extend along the front interior wall 21a. The front mounting device 33 may be fixed to the front mounting boss 35, and the center of the front mounting device 33 may be aligned with the center of the front mounting boss 35. The front mounting device 33 may be in the shape of a nut. Refer to Figure 10 , the front mounting portion 15a of the rear subframe 15 may be mounted on the front mounting seat 31 through the front mounting device 33.

[0105] According to the prior art, the rear longitudinal beam has a front mounting boss formed at its front portion, the front mounting portion of the rear subframe is mounted on the front mounting boss, the front mounting boss is formed at the lower part of the front portion of the interior wall of the rear longitudinal beam, and the interior wall of the rear longitudinal beam may be adjacent to the interior edge of the rear longitudinal beam. Therefore, the thickness of the front mounting boss will be formed relatively thick. As a result, not only the castability of the rear longitudinal beam becomes poor, but also a plurality of air holes are formed inside the interior wall, so its casting quality will be low. In contrast, the front interior wall 21a of the present invention extends along the center line between the outdoor edge and the indoor edge of the longitudinal portion 11, so that the thickness of the front mounting boss 35 formed at the lower part of the front interior wall 21a can be relatively thin, thereby improving its castability, and no air holes are formed inside the front mounting boss 35, so its casting quality can be improved.

[0106] Refer to Figure 7, each longitudinal portion 11 may include a front recessed structure 37 formed above the front mounting seat 31. As the front recessed structure 37 is formed above the front mounting seat 31, the castability of the rear frame 10 can be ensured. The front mounting seat 31 is formed at the lower edge of the front interior wall 21a, so the front recessed structure 37 may be a structure that is recessed downward from a part between the front interior wall 21a and the first lateral portion 12. Therefore, the front recessed structure 37 may be defined by the front interior wall 21a, the lower wall 43 of the first lateral portion 12, and the front mounting seat 31, and the front recessed structure 37 may be a bag-like shape with an open upper part. Refer to Figure 12 , the front recessed structure 37 may be a substantially semicircular bag-like shape facing the front interior wall 21a. The front recessed structure 37 may have a front reinforcing rib 35a extending from the front interior wall 21a toward the interior of the vehicle. The front reinforcing rib 35a extends from the front mounting boss 35 of the front interior wall 21a toward the lower wall 43 of the first lateral portion 12, so that the front reinforcing rib 35a may be formed across the front recessed structure 37. The front reinforcing rib 35a may extend in the vehicle width direction, and the front reinforcing rib 35a may be orthogonal to the front interior wall 21a. Therefore, the rigidity of the front recessed structure 37 can be strengthened by the front reinforcing rib 35a.

[0107] Since the front recessed structure 37 is a bag-like shape with an open upper part, during the electrophoretic coating of the rear frame 10, the electrophoretic coating liquid may accumulate inside the front recessed structure 37, and there is a problem that the electrophoretic coating liquid accumulated inside the front recessed structure 37 burns during the baking step of the electrophoretic coating process. To solve this problem, a through hole 72 may be formed in a part of the front interior wall 21a that defines the front recessed structure 37, and the through hole 72 may open toward the outside of the front recessed structure 37. The through hole 72 may extend obliquely from the front interior wall 21a toward the outside of the vehicle, and the through hole 72 may be directly connected to the front recessed structure 37. Therefore, the electrophoretic coating liquid remaining inside the front recessed structure 37 is discharged through the through hole 72 of the front recessed structure 37, so that it does not accumulate inside the front recessed structure 37.

[0108] The rear mounting seat 32 may be formed at a part of the lower edge of the rear interior wall 22a. Refer to Figure 3 and Figure 4 , the rear mounting seat 32 may be substantially circular, and the rear interior wall 22a may pass across the center line of the rear mounting seat 32 or a line adjacent to it. The rear mounting seat 32 can be integrally connected to the rear interior wall 22a.

[0109] Refer to Figure 8, the rear mounting seat 32 can be horizontally and flatly formed on the bottom surface of the lower edge of the rear inner wall 22a. Each longitudinal portion 11 may include a rear mounting boss 36 located at the center of the rear mounting seat 32. The center line of the rear mounting seat 32 can be aligned with the center line of the corresponding longitudinal portion, and the rear mounting boss 36 can be aligned with the center line of the longitudinal portion 11 and the center line of the corresponding rear mounting seat 32. The rear mounting boss 36 can be formed at the lower part of the rear of the rear inner wall 22a and can extend vertically along the rear inner wall 22a. The rear mounting device 34 can be fixed to the rear mounting boss 36, and the center of the rear mounting device 34 can be aligned with the center of the rear mounting boss 36. The rear mounting device 34 can be in the shape of a bolt. Refer to Figure 10 , the rear mounting portion 15b of the rear subframe 15 can be mounted on the rear mounting seat 32 through the rear mounting device 34.

[0110] According to the prior art, the rear longitudinal beam has a rear mounting boss formed at its rear part, the rear mounting portion of the rear subframe is mounted on the rear mounting boss, the rear mounting boss is formed at the lower part of the rear of the inner wall of the rear longitudinal beam, and the inner wall of the rear longitudinal beam is adjacent to the inner edge of the rear longitudinal beam. Therefore, the thickness of the rear mounting boss will be formed relatively thick. As a result, not only the castability of the rear longitudinal beam becomes poor, but also a plurality of air holes are formed inside the inner wall, so its casting quality will be low. In contrast, the rear inner wall 22a of the present invention extends along the center line between the outer edge and the inner edge of the longitudinal portion 11, so that the thickness of the rear mounting boss 36 formed at the lower part of the rear inner wall 22a can be relatively thin, thereby improving its castability, and no air holes are formed inside the rear mounting boss 36, so its casting quality can be improved.

[0111] Refer to Figure 8 , each longitudinal portion 11 may include a rear recessed structure 38 formed above the rear mounting seat 32. With the rear recessed structure 38 formed above the rear mounting seat 32, the castability of the rear frame 10 can be ensured. The rear mounting seat 32 is formed at the lower edge of the rear inner wall 22a, so the rear recessed structure 38 can be a structure that is recessed downward from a part between the rear inner wall 22a and the first inner horizontal wall 28b of the longitudinal portion 11. Therefore, the rear recessed structure 38 can be defined by the rear inner wall 22a, the first inner horizontal wall 28b of the longitudinal portion 11, and the rear mounting seat 32, and the rear recessed structure 38 can be a bag-like shape with an open upper part. Refer to Figure 13, the rear recessed structure 38 may be a generally semi-circular bag shape facing the rear interior wall 22a. The rear recessed structure 38 may have a rear reinforcing rib 36a extending from the rear interior wall 22a toward the vehicle interior. The rear reinforcing rib 36a extends from the rear mounting boss 36 of the rear interior wall 22a toward the first interior horizontal wall 28b of the longitudinal portion 11, so that the rear reinforcing rib 36a may be formed across the rear recessed structure 38. The rear reinforcing rib 36a may extend in the vehicle width direction, and the rear reinforcing rib 36a may be orthogonal to the rear interior wall 22a. Therefore, the rigidity of the rear recessed structure 38 can be strengthened by the rear reinforcing rib 36a.

[0112] The rear recessed structure 38 is a bag shape with an open top. Thus, during the electrocoating of the rear subframe 10, the electrocoating liquid may accumulate inside the rear recessed structure 38, and there is a problem that the electrocoating liquid accumulated in the rear recessed structure 38 burns during the baking step of the electrocoating process. To solve this problem, a through hole 73 may be formed in a part of the rear interior wall 22a that defines the rear recessed structure 38, and the through hole 73 may open toward the outside of the rear recessed structure 38. According to an example, the through hole 73 may extend obliquely from the rear interior wall 22a toward the outside of the vehicle, and the through hole 73 may be directly connected to the rear recessed structure 38. Therefore, the electrocoating liquid remaining in the rear recessed structure 38 is discharged through the through hole 73, so that it does not accumulate in the rear recessed structure 38.

[0113] As described above, the front interior wall 21a is integrally connected to the front mounting seat 31, the rear interior wall 22a is integrally connected to the rear mounting seat 32, the front mounting portion 15a of the rear subframe 15 is mounted on the front mounting seat 31, and the rear mounting portion 15b of the rear subframe 15 is mounted on the rear mounting seat 32. Thus, the rear subframe 15 mounted on the pair of longitudinal portions 11 can be stably supported by the front interior wall 21a and the rear interior wall 22a in the vehicle length direction.

[0114] The rear end of each longitudinal portion 11 may be connected to a corresponding rear extension member 9. The rear interior wall 22a of each longitudinal portion 11 may be fixed to the rear extension member 9. Refer to Figure 5 and Figure 9, the rear interior wall 22a may include a plurality of rear extension member mounting bosses 51 disposed at its rear portion, and each mounting boss 51 may have a mounting hole defined therein. The front portion of the rear extension member 9 may be fixed to the rear extension member mounting bosses 51 of the rear interior wall 22a by bolts 81. Mounting means such as self-tapping nuts 61 may be installed in the mounting holes of the corresponding rear extension member mounting bosses 51. The self-tapping nut 61 may have an internal thread portion 61a formed on its inner side surface and an external thread portion 61b formed on its outer side surface. The rear extension member mounting boss 51 is tapped by the external thread portion 61b of the self-tapping nut 61, so that the self-tapping nut 61 can be installed on the rear extension member mounting boss 51, and the external thread portion 81a of the bolt 81 is screwed into the internal thread portion 61a of the self-tapping nut 61, so that the front portion of the rear extension member 9 can be installed on the rear extension member mounting bosses 51 of the rear interior wall 22a.

[0115] Refer to Figure 3 , the first lateral portion 12 may include a plurality of seat-side mounting bosses 52 adjacent to its front edge. The plurality of seat-side mounting bosses 52 may be spaced apart in the vehicle width direction, and each seat-side mounting boss 52 may have a mounting hole defined therein. Refer to Figure 6 , the seat-side mounting boss 52 may protrude upward from the raised wall 45 of the first lateral portion 12, and the rear seat mounting portion 17 of the rear vehicle seat (e.g., the second row seat of the vehicle) may be mounted to the seat-side mounting boss 52 by bolts. Mounting means such as self-tapping nuts 62 may be installed in the mounting holes of the corresponding seat-side mounting bosses 52. The self-tapping nut 62 may have an internal thread portion 62a formed on its inner side surface and an external thread portion 62b formed on its outer side surface. The seat-side mounting boss 52 is tapped by the external thread portion 62b of the self-tapping nut 62, so that the self-tapping nut 62 can be installed on the seat-side mounting boss 52, and the bolt is screwed into the internal thread portion 62a of the self-tapping nut 62, so that the rear seat mounting portion 17 can be installed on the seat-side mounting bosses 52 of the first lateral portion 12. The plurality of seat-side mounting bosses 52 may be symmetrically arranged with respect to the central portion of the first lateral portion 12.

[0116] Refer to Figure 3 , the first lateral portion 12 may include a plurality of battery-side mounting bosses 53 adjacent to the plurality of seat-side mounting bosses 52. The plurality of battery-side mounting bosses 53 may be spaced apart in the vehicle width direction. Each battery-side mounting boss 53 may have a mounting hole defined therein. Refer to Figure 6, the battery-side mounting boss 53 may be located at the rear side of the seat-side mounting boss 52. The battery-side mounting boss 53 may protrude downward from the raised wall 45 of the first lateral portion 12. The battery 18 may be mounted to the battery-side mounting boss 53 by bolts. Mounting devices such as self-tapping nuts 63 may be mounted in the mounting holes of the battery-side mounting boss 53. The self-tapping nut 63 may have an internal thread portion 63a formed on its inner side and an external thread portion 63b formed on its outer side. The battery-side mounting boss 53 is tapped by the external thread portion 63b of the self-tapping nut 63 so that the self-tapping nut 63 can be mounted to the battery-side mounting boss 53, and the bolt is screwed into the internal thread portion 63a of the self-tapping nut 63, so that the battery 18 can be mounted to the battery-side mounting boss 53 of the first lateral portion 12. A plurality of battery-side mounting bosses 53 may be symmetrically arranged with respect to the central portion of the first lateral portion 12.

[0117] Refer to Figure 3 , the first lateral portion 12 may include a plurality of first mounting bosses 54 adjacent to its rear edge. Each first mounting boss 54 may have a mounting hole defined therein. The front seat mounting portion of the seat (e.g., the third-row seat of the vehicle) located at the rearmost position in the passenger compartment of the vehicle may be mounted to the first mounting boss 54 of the first lateral portion 12 by bolts.

[0118] Refer to Figure 3 , the second lateral portion 13 may include a plurality of second mounting bosses 55. Each second mounting boss 55 may have a mounting hole defined therein. The rear seat mounting portion of the seat (e.g., the third-row seat of the vehicle) located at the rearmost position in the passenger compartment of the vehicle may be mounted to the second mounting boss 55 of the second lateral portion 13 by bolts.

[0119] Refer to Figure 4, each longitudinal portion 11 may include a plurality of reinforcing ribs 11a, 11b, 11c integrally formed on its bottom surface. The plurality of reinforcing ribs 11a, 11b, 11c may be composed of a first reinforcing rib 11a extending along the length direction of each longitudinal portion 11, a plurality of second reinforcing ribs 11b extending obliquely, and a plurality of third reinforcing ribs 11c extending along the width direction of each longitudinal portion 11. The first reinforcing rib 11a may be spaced apart from the front interior wall 21a, the shock absorber seat 23, and the rear interior wall 22a toward the vehicle interior. The plurality of reinforcing ribs 11a, 11b, 11c may be arranged in a mutually intersecting manner along the length direction of each longitudinal portion 11, and the plurality of reinforcing ribs 11a, 11b, 11c can be integrally connected to the front interior wall 21a, the interior wall 23c of the shock absorber seat 23, and the rear interior wall 22a. The plurality of second reinforcing ribs 11b may connect the shock absorber seat 23 to the first reinforcing rib 11a, and the plurality of third reinforcing ribs 11c may connect the front interior wall 21a and the rear interior wall 22a to the first reinforcing rib 11a. Thus, the rigidity of each longitudinal portion 11 and the shock absorber seat 23 can be strengthened by the plurality of reinforcing ribs 11a, 11b, 11c.

[0120] Refer to Figure 5 , each longitudinal portion 11 may include a plurality of reinforcing ribs 11f integrally formed on the front interior wall 21a, the interior wall 23c of the shock absorber seat 23, and the rear interior wall 22a. The plurality of reinforcing ribs 11f may be connected in a mutually intersecting manner along the length direction of the longitudinal portion 11. Thus, the lateral stiffness of each longitudinal portion 11 can be strengthened by the plurality of reinforcing ribs 11f.

[0121] Refer to Figure 4 , the first transverse portion 12 may include a plurality of reinforcing ribs 12a, 12b, 12c integrally formed on its bottom surface. The plurality of reinforcing ribs 12a, 12b, 12c may be composed of a plurality of first reinforcing ribs 12a extending along the vehicle width direction, a plurality of second reinforcing ribs 12b extending along the vehicle length direction, and a plurality of third reinforcing ribs 12c extending obliquely. The plurality of reinforcing ribs 12a, 12b, 12c may be arranged in a mutually intersecting manner along the vehicle width direction. Thus, the rigidity of the first transverse portion 12 can be strengthened by the plurality of reinforcing ribs 12a, 12b, 12c. A part of the reinforcing ribs 12a, 12b, 12c may be connected to the plurality of battery side mounting bosses 53. For example, the first reinforcing rib 12a, the second reinforcing rib 12b, and the third reinforcing rib 12c are cross-connected to each battery side mounting boss 53, thereby strengthening the rigidity of the plurality of battery side mounting bosses 53.

[0122] Refer to Figure 4, the first lateral part 12 may include a plurality of reinforcing ribs 54a, 54b, 54c integrally connected to the first mounting boss 54. The plurality of reinforcing ribs 54a, 54b, 54c may be composed of a plurality of first reinforcing ribs 54a extending in the vehicle width direction, a plurality of second reinforcing ribs 54b extending obliquely, and a plurality of third reinforcing ribs 54c extending in the vehicle length direction. For example, the plurality of first reinforcing ribs 54a may be connected to the first mounting boss 54 adjacent to the center line of the rear frame 10. The first reinforcing rib 54a, the second reinforcing rib 54b, and the third reinforcing rib 54c may be cross-connected to the first mounting boss 54 located at each end of the first lateral part 12.

[0123] Referring to Figure 4 , the second lateral part 13 may include a plurality of reinforcing ribs 13a, 13b integrally formed on its bottom surface. The plurality of reinforcing ribs 13a, 13b may be composed of a plurality of first reinforcing ribs 13a extending in the vehicle width direction and a plurality of second reinforcing ribs 13b extending obliquely. The plurality of reinforcing ribs 13a, 13b may be arranged to cross each other in the vehicle width direction, and the rigidity of the second lateral part 13 may be strengthened by the plurality of reinforcing ribs 13a, 13b.

[0124] Referring to Figure 4 , the second lateral part 13 may include a plurality of reinforcing ribs 55a, 55b, 55c integrally connected to the second mounting boss 55. The plurality of reinforcing ribs 55a, 55b, 55c may be composed of a plurality of first reinforcing ribs 55a extending in the vehicle length direction, a plurality of second reinforcing ribs 55b extending obliquely, and a plurality of third reinforcing ribs 55c extending in the vehicle width direction. For example, the first reinforcing rib 55a, the second reinforcing rib 55b, and the third reinforcing rib 55c may be cross-connected to the second mounting boss 55.

[0125] The above description only exemplarily describes the technical idea of the present invention. Those of ordinary skill in the art can make various modifications and deformations without departing from the essential characteristics of the present invention.

[0126] Therefore, the embodiments disclosed in the present invention are intended to illustrate the technical idea rather than limit it. Any interpretation based on these embodiments should not limit the scope of the technical idea of the present invention. The protection scope of the present invention should be interpreted according to the claims, and all technical ideas within the equivalent scope thereof should be interpreted as being included in the scope of the claims of the present invention.

Claims

1. A rear frame, comprising: a pair of longitudinal portions spaced apart in a vehicle width direction; a first transverse portion connecting front portions of the pair of longitudinal portions; as well as a second transverse portion connecting rear portions of the pair of longitudinal portions; The pair of longitudinal portions, the first transverse portion, and the second transverse portion form an integrated structure, and each longitudinal portion has a shock absorber seat for mounting a suspension shock absorber.

2. The rear frame according to claim 1, wherein: The shock absorber seat is in a bag shape with a cavity opened at the bottom.

3. The rear frame according to claim 1, wherein: Each longitudinal portion includes a front interior wall extending from the shock absorber seat toward the front of the vehicle and a rear interior wall extending from the shock absorber seat toward the rear of the vehicle. The front interior wall and the rear interior wall extend along a center line between an interior edge and an exterior edge of the longitudinal portion.

4. The rear frame according to claim 3, wherein: The rear chamber inner wall includes a rear extension member mounting boss formed at the rear portion thereof, and the front end of the rear extension member is fixed to the rear extension member mounting boss by a fastener.

5. The rear frame according to claim 3, wherein: Each longitudinal portion includes a front mounting seat arranged on the bottom surface of the front portion thereof and a rear mounting seat arranged on the bottom surface of the rear portion thereof. The front mounting portion of the rear subframe is mounted on the front mounting seat, and the rear mounting portion of the rear subframe is mounted on the rear mounting seat.

6. The rear frame according to claim 5, wherein: The front mounting seat is substantially circular, and the rear mounting seat is substantially circular.

7. The rear frame according to claim 5, wherein: The shock absorber seat is located between the front mounting seat and the rear mounting seat.

8. The rear frame according to claim 5, wherein: The front mounting seat is formed at a lower edge of the front chamber inner wall, and the rear mounting seat is formed at a lower edge of the rear chamber inner wall.

9. The rear frame according to claim 5, wherein: Each longitudinal portion further includes a front mounting boss located at the center of the front mounting seat, a front mounting device fixed to the front mounting boss, a rear mounting boss located at the center of the rear mounting seat, and a rear mounting device fixed to the rear mounting boss. Wherein, the front mounting boss and the rear mounting boss are aligned with the center lines of each longitudinal portion.

10. The rear frame according to claim 5, wherein: Also includes: A front recessed structure is formed above the front mounting seat and a rear recessed structure is formed above the rear mounting seat.

11. The rear frame according to claim 10, wherein: The front recessed structure is in the shape of a roughly semicircular bag, and the rear recessed structure is in the shape of a roughly semicircular bag.

12. The rear frame according to claim 10, wherein: The front recessed structure is defined by the front chamber inner wall and the front mounting seat, and has a front reinforcing rib extending from the front chamber inner wall toward the vehicle interior.

13. The rear frame according to claim 10, wherein: The rear recessed structure is defined by the rear chamber inner wall and the rear mounting seat, and has a rear reinforcing rib extending from the rear chamber inner wall toward the vehicle interior.

14. The rear frame according to claim 1, wherein: The first transverse portion includes a plurality of seat side mounting bosses for mounting the seat mounting portion of the vehicle seat, each seat side mounting boss protrudes upward from the first transverse portion, and the mounting device is mounted in a corresponding mounting hole of the seat side mounting boss.

15. The rear frame according to claim 14, wherein: The plurality of seat-side mounting bosses are symmetrically arranged with respect to a central portion of the first lateral portion.

16. The rear frame according to claim 1, wherein: The first transverse portion includes a plurality of battery-side mounting bosses for mounting batteries, each battery-side mounting boss protrudes downward from the first transverse portion, and the mounting device is mounted in a corresponding mounting hole of the battery-side mounting boss.

17. The rear frame according to claim 16, wherein: The plurality of battery-side mounting bosses are arranged symmetrically with respect to a central portion of the first lateral portion.

18. The rear frame according to claim 16, wherein: The first lateral portion includes a plurality of reinforcing ribs cross-connected to the plurality of battery-side mounting bosses.

19. The rear frame according to claim 1, wherein: The second transverse portion includes a plurality of reinforcing ribs formed on a bottom surface thereof.

20. The rear frame according to claim 1, wherein: Each longitudinal portion includes a plurality of reinforcing ribs formed on its bottom surface, The plurality of reinforcing ribs include a first reinforcing rib extending along a length direction of each longitudinal portion and a plurality of second reinforcing ribs connecting the shock absorber seat and the first reinforcing rib.

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