CN211281198U - Rear auxiliary frame - Google Patents

Abstract

The utility model provides a back sub vehicle frame, including two longerons to and connect front beam and the rear beam between two longerons, still including installing two back xarm installing supports on the rear beam, and locate the connection structure between rear beam and each back xarm installing support, its constitutes being connected of back xarm installing support and rear beam, and because of this connection structure's connection, each back xarm installing support can be located a plurality of different positions of rear beam length direction. Back sub vehicle frame, back sub vehicle frame go up the position of back xarm installing support adjustable to be equipped with connection structure between back crossbeam and back xarm installing support, and because of this connection, back xarm installing support can be located back crossbeam length direction's a plurality of different positions, therefore the development of reducible back xarm, reduce the development cycle and the cost of back xarm, and can improve this back sub vehicle frame's commonality, thereby reduce the development cycle and the cost of back sub vehicle frame, better practicality has.

Description

Rear auxiliary frame

Technical Field

The utility model relates to a frame technical field of vehicle, in particular to back sub vehicle frame.

Background

The rear auxiliary frame is a buffer device for connecting the vehicle body and the suspension, is an important structural member of a vehicle chassis system, and is mainly used for supporting chassis parts such as the suspension, steering and suspension, reducing and buffering vibration from the road surface, and improving the connection rigidity of the suspension and the comfort of the whole vehicle.

With the rapid development of new energy automobiles, the requirement for the lightweight of the automobile chassis is also pressing day by day. The rear auxiliary frame is used as one of the largest parts of the chassis system, and the lightweight means mainly comprises two modes of structural topological optimization and light material adoption.

For the whole vehicle, in order to guarantee the durability and reliability of the whole vehicle, the requirement of the whole vehicle on light weight cannot be met by adopting topological optimization on the basis of the existing steel auxiliary frame, and the only feasible way is to adopt a large amount of light materials, wherein the light material auxiliary frame comprises an aluminum alloy auxiliary frame and a composite material auxiliary frame. The composite material auxiliary frame adopts an injection molding process, the light weight effect is best, the cost is highest, only few sports cars are applied, and the aluminum alloy auxiliary frame simultaneously considers the light weight and the cost of the chassis, so that the development of the new energy automobile chassis is inevitable in the future.

The existing rear auxiliary frame mainly comprises an integrally cast aluminum alloy auxiliary frame and a split type welding auxiliary frame. The integral casting type aluminum alloy auxiliary frame is low in qualified rate, large in casting deformation, high in cost and incapable of achieving both light weight and cost, and the probability of generating sand holes, shrinkage porosity and air holes is increased. The split type welding auxiliary frame is low in cost, but the types of parts are more, a plurality of suppliers need to be developed, and the quality is not easy to control. No matter the whole casting type aluminum alloy auxiliary frame or the split welding type aluminum alloy auxiliary frame, the research and development period is long, the cost is high, and the platform and the assimilation of chassis parts can not be realized.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention provides a rear subframe to improve the versatility and reduce the development cost.

In order to achieve the above purpose, the technical scheme of the utility model is realized like this:

a rear subframe including two longitudinal members extending in a longitudinal direction of a vehicle, the two longitudinal members being opposed to each other in a width direction of the vehicle, and a front cross member and a rear cross member extending in the width direction of the vehicle being connected between the two longitudinal members, and the front cross member and the rear cross member being arranged front and rear in the longitudinal direction of the vehicle, characterized in that the rear subframe further includes:

two rear cross arm mounting brackets, both mounted on the rear cross beam, to be connected with two rear cross arms of a suspension of the vehicle, respectively;

a connection structure provided between the rear cross member and each of the rear cross arm mounting brackets to constitute a connection of the rear cross arm mounting brackets with the rear cross member, and each of the rear cross arm mounting brackets can be positioned at a plurality of different positions in a length direction of the rear cross member due to the connection.

Furthermore, the connecting structure comprises through holes correspondingly formed in the rear cross beam and the rear cross arm mounting supports and bracket connecting pieces penetrating through the corresponding through holes, the through holes in the rear cross beam and/or the rear cross arm mounting supports are strip-shaped holes, and the length direction of each strip-shaped hole extends along the length direction of the rear cross beam.

Furthermore, the rear cross beam is of a tubular structure with a hollow interior, and the cross section of the rear cross beam is in a square ring shape.

Furthermore, each rear cross arm mounting bracket comprises an inverted U-shaped bracket mounting part and a rear cross arm mounting part which is integrally and fixedly connected to the bracket mounting part; the rear cross arm mounting bracket is connected with the rear cross arm through a rear cross arm connecting piece penetrating through the mounting hole.

Furthermore, back xarm installation department including set firmly in two mounting panels on the leg joint portion, and two mounting panels in interval arrangement around on the leg joint portion, in two all seted up on the mounting panel the mounting hole, back xarm connecting piece including wear to locate bolt in the mounting hole, and with the nut that the bolt spiro union links to each other.

Further, a locking portion is formed on the circumferential side of the mounting hole, and the locking portion cooperates with an external member to limit the reverse loosening of the nut.

Furthermore, the front cross beam is of a hollow tubular structure, the cross section of the front cross beam is circular, and two ends of the front cross beam are bent downwards relative to the middle.

Furthermore, the two longitudinal beams are tubular structures with through holes formed inside, a front mounting position sleeve is integrally constructed at the front end of each longitudinal beam, a rear mounting position sleeve is integrally constructed at the rear end of each longitudinal beam, shaft sleeve holes are respectively formed in the front mounting position sleeve and the rear mounting position sleeve, and the two shaft sleeve holes are respectively communicated with the through holes.

Furthermore, a front connecting part connected with the front cross beam and a rear connecting part connected with the rear cross beam are integrally formed on the longitudinal beam, communicating holes communicated with the through holes are formed in the front connecting part and the rear connecting part, a positioning part is formed in at least one of the communicating holes, and the positioning part forms prepositioning before the longitudinal beam and the front cross beam are fixedly connected.

Furthermore, the rear cross beam, the front cross beam and the two rear cross arm mounting brackets are extruded/hydraulically formed by adopting wrought aluminum alloy, and the two longitudinal beams are cast and formed by adopting cast aluminum alloy.

Compared with the prior art, the utility model discloses following advantage has:

(1) back sub vehicle frame, through making the position of back xarm installing support adjustable on the back sub vehicle frame to be equipped with connection structure between back crossbeam and back xarm installing support, and because of this connection, back xarm installing support can be located back crossbeam length direction's a plurality of different positions, therefore the development of reducible back xarm, reduce the development cycle and the cost of back xarm, and can improve this back sub vehicle frame's commonality, thereby reduce the development cycle and the cost of back sub vehicle frame, better practicality has.

(2) The connecting structure is set to be a structure of the through hole and the bracket connecting piece, so that the connection reliability of the rear cross arm mounting bracket and the rear cross beam is guaranteed.

(3) The cross section of the rear cross beam is in a square ring shape, so that the rear cross beam is lighter in weight on the basis of ensuring the strength of the rear cross beam.

(4) The rear cross arm mounting bracket comprises an inverted U-shaped bracket mounting part and a rear cross arm mounting part, so that the mounting reliability of the rear cross arm mounting bracket can be improved, and the rear cross arm mounting bracket is convenient to connect with a rear cross arm.

(5) The rear cross arm mounting part comprises two mounting plates, mounting holes are formed in the mounting plates, the rear cross arm and the rear cross arm mounting support can be connected by utilizing the matching of bolts and nuts, and the connection reliability can be effectively guaranteed.

(6) The anti-loosening part is arranged, so that the nut can be prevented from being loosened reversely, and the connection reliability of the rear cross arm and the rear cross arm mounting bracket is further improved.

(7) The cross section of the front cross beam is annular, and the two ends of the front cross beam are bent downwards relative to the middle part, so that the front cross beam can be lighter in weight under the condition of ensuring the structural strength of the front cross beam.

(8) The front end and the rear end of the longitudinal beam are respectively provided with a front mounting position sleeve and a rear mounting position sleeve which are provided with shaft sleeve holes, and the shaft sleeve holes are communicated with the through holes in the longitudinal beam, so that the longitudinal beam is beneficial to casting and integral forming.

(9) And the positioning parts are arranged in the front connecting part and/or the rear connecting part, so that the longitudinal beam is conveniently assembled and connected with the front cross beam and the rear cross beam.

(10) The rear cross beam, the front cross beam and the rear cross arm mounting bracket are extruded/hydraulically formed by wrought aluminum alloy, the longitudinal beam is cast and formed by cast aluminum alloy, and different materials and forming modes are selected and matched according to different structures, so that the rear auxiliary frame is low in cost.

Drawings

The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:

fig. 1 is a schematic structural view of a rear subframe according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a longitudinal beam according to an embodiment of the present invention;

fig. 3 is a schematic structural view of a longitudinal beam according to an embodiment of the present invention;

fig. 4 is a schematic view of another structure of a longitudinal beam according to an embodiment of the present invention;

fig. 5 is a schematic structural view of a front cross member according to an embodiment of the present invention;

fig. 6 is a schematic structural view of a rear cross member according to an embodiment of the present invention;

fig. 7 is a schematic structural view of a rear cross arm mounting bracket according to an embodiment of the present invention;

FIG. 8 is a front view of FIG. 7;

FIG. 9 is a left side view of FIG. 7;

description of reference numerals:

1-longitudinal beam, 2-front beam, 3-rear beam and 4-rear cross arm mounting bracket;

101-front mounting position sleeve, 102-rear mounting position sleeve, 103-front connecting part, 104-rear connecting part, 105-positioning part, 106-process hole, 107-upper control arm mounting bracket, 108-lower control arm mounting bracket, 109-machine frame positioning surface and 110-machine frame positioning column;

301-rear beam via hole, 302-bracket connection;

401-bracket mounting part, 4011-bracket through hole, 402-rear cross arm mounting part, 4021-mounting hole and 4022-locking part.

Detailed Description

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it should be noted that the terms "front", "back", "left", "right", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

The present embodiment relates to a rear subframe, as shown in fig. 1, which includes two side members 1 extending in a longitudinal direction of a vehicle, the two side members 1 being opposed to each other in a width direction of the vehicle, and a front cross member 2 and a rear cross member 3 extending in the width direction of the vehicle being connected between the two side members 1, and the front cross member 2 and the rear cross member 3 being arranged front and rear in the longitudinal direction of the vehicle.

The main improvement point of the present embodiment is that two rear cross arm mounting brackets 4 are mounted on the rear cross beam 3, and a connection structure is provided between the rear cross arm mounting brackets 4 and the rear cross beam 3, the connection structure is used for connecting the rear cross arm mounting brackets 4 and the rear cross beam 3, and each rear cross arm mounting bracket 4 can be positioned at a plurality of different positions in the length direction of the rear cross beam 3 due to the connection.

Based on the above overall structural description, in order to better understand the present embodiment, the structure of the longitudinal beam 1 is first described below with reference to fig. 1 and fig. 2 to 4. Since the two side members 1 are arranged symmetrically along the center line in the vehicle width direction, the structure of one side member 1 will be described below as an example. The longitudinal beam 1 is cast and formed by cast aluminum alloy, preferably ZL101 in the prior art, and is formed by low-pressure casting or differential pressure casting.

The longitudinal beam 1 is of a tubular structure with a through hole formed in the inner part, and the middle part of the longitudinal beam 1 protrudes towards one side relative to two ends, so that the longitudinal beam 1 is in an arch bridge shape, and the rigidity and the strength of the longitudinal beam are improved. A front mounting position sleeve 101 is integrally constructed at the front end of the longitudinal beam 1, a bearing hole is formed in the front mounting position sleeve 101, and the axis of the bearing hole extends along the height direction of the vehicle; a rear mounting position sleeve 102 is integrally formed at the rear end of the longitudinal beam 1, a shaft sleeve hole is formed in the rear mounting position sleeve 102, the axis of the shaft sleeve hole also extends along the height direction of the vehicle, and the two shaft sleeve holes are respectively communicated with a through hole in the longitudinal beam 1 so as to be convenient for casting.

In addition, a front connecting portion 103 connected with the front cross member 2 and a rear connecting portion 104 connected with the rear cross member 3 are integrally formed on the side member 1, and communication holes are formed in both the front connecting portion 103 and the rear connecting portion 104, so that the front connecting portion 103 and the rear connecting portion 104 are also of a tubular structure, and the communication holes are communicated with through holes in the side member 1 for casting. To facilitate connection with the front cross member 2 and the rear cross member 3, the front connecting portion 103 has a circular cross section, and the rear connecting portion 104 has a square ring cross section.

In order to further facilitate the connection between the longitudinal beam 1 and the rear cross beam 3, a positioning portion 105 is formed in the communication hole of the rear connecting portion 104, and the positioning portion 105 is a limiting ring formed by extending from the hole wall of the communication hole to the center, so that the positioning effect is good, and the casting is not affected. Before the longitudinal beam 1 is connected with the rear cross beam 3, the rear cross beam 3 is abutted with the limiting ring, so that the longitudinal beam 1 and the front cross beam 2 can be quickly adjusted to a proper assembly position, and the limiting ring can form pre-positioning before the longitudinal beam 1 and the front cross beam 2 are fixedly connected. Besides, the positioning portion 105 may be provided in the communication hole of the front connecting portion 103 at the same time, or the positioning portion 105 may be provided only in the communication hole of the front connecting portion 103, but the post-assembly process of providing the positioning portion 105 only in the communication hole of the front connecting portion 103 is complicated and the application effect is poor compared to the method of providing the positioning portion 105 only in the communication hole of the rear connecting portion 104.

For the purpose of facilitating connection to an upper control arm and a lower control arm not shown in the drawings, an upper control arm mounting bracket 107 and a lower control arm mounting bracket 108 are integrally formed on the side member 1. In a preferred embodiment, each of the upper control arm mounting bracket 107 and the lower control arm mounting bracket 108 includes two mounting plates disposed at an interval, and each of the mounting plates has a mounting hole, so that the upper control arm and the lower control arm are connected via a bolt inserted into the mounting hole. In order to ensure the mounting flatness and reduce the bolt torque attenuation caused by overlarge flatness, the two surfaces of each mounting plate are machined.

In addition, a fabrication hole 106 is formed in the longitudinal beam 1 to facilitate casting, and the fabrication hole 106 is specifically communicated with a through hole in the longitudinal beam 1 to facilitate drainage or sand discharge in the casting process. As shown in fig. 2 and fig. 3, two fabrication holes 106 are disposed near the rear installation site sleeve 102 and are respectively disposed on both sides of the longitudinal beam 1; one fabrication hole 106 is arranged on one side of the middle part of the longitudinal beam 1; another tooling hole 106 is located on the side of the stringer 1 where the curvature is larger and is located between the upper control arm mounting bracket 107 and the lower control arm mounting bracket 108.

For the convenience of processing, a machined positioning surface 109 is formed on the upper side of the longitudinal beam 1 and is positioned on the side with the smaller bending radian of the longitudinal beam 1, so that the positioning can be rapidly carried out in the machining process. In addition, two machining positioning columns 110 are formed on the longitudinal beam 1, and the two machining positioning columns 110 are respectively arranged close to the front mounting position sleeve 101 and the rear mounting position sleeve 102 so as to be convenient for quick positioning in the assembling or machining process.

As shown in fig. 1 and fig. 5, both ends of the front cross member 2 are connected with the front connection portions 103 of the longitudinal members 1 by welding, and the ends of the front cross member 2 are inserted into the communication holes of the front connection portions 103 to be connected with the longitudinal members 1 in an overlapping manner, so that the connection strength between the two is effectively ensured.

In order to ensure the self-weight of the vehicle body to be light while ensuring the self-structural strength, the front cross beam 2 is a tubular structure with a hollow inner part, the cross section of the front cross beam 2 is circular, and two ends of the front cross beam 2 are arranged in a downward bending way relative to the middle part, in a preferred embodiment, an included angle α between an axial central line b of the end part of the front cross beam 2 and an axial central line a of the middle part is preferably 145 °.

As shown in fig. 1 and fig. 6, both ends of the rear cross member 3 are welded to the rear connection portions 104 of the side members 1, and the ends of the rear cross member 3 are inserted into the communication holes of the rear connection portions 104 to be connected to the side members 1 in an overlapping manner, thereby ensuring the connection strength therebetween.

In order to make the self weight lighter while guaranteeing self structural strength, the rear cross beam 3 is a tubular structure with a hollow interior, and the cross section of the rear cross beam 3 is in a square ring shape. Rear cross member via holes 301 are respectively formed on two opposite sides of the rear cross member 3, in this embodiment, the rear cross member via holes 301 are preferably strip-shaped holes, and the length direction of the rear cross member via holes 301 extends along the width direction of the vehicle.

Two rear cross arm mounting brackets 4 are attached to the rear cross member 3, and both are attached to the rear cross member 3, and since the two rear cross arm mounting brackets 4 have the same structure, one rear cross arm mounting bracket 4 will be described below by way of example with reference to fig. 7 and 9. The rear crossbar mounting bracket 4 includes a bracket mounting portion 401 in the shape of an inverted U, and a rear crossbar mounting portion 402 integrally attached to the bracket mounting portion 401.

Two support through holes 4011 are respectively opened on two oppositely arranged side plates of the support mounting part 401, and the support through holes 4011 on the two side plates are correspondingly arranged, when the support mounting part 401 is buckled on the rear cross beam 3, the rear cross beam 3 and the rear cross arm mounting support 4 can be connected through a support connecting piece 302 penetrating through the rear cross beam through hole 301 and the support through hole 4011. In a preferred embodiment, the bracket connector 302 includes a bolt disposed through a corresponding through hole, and a nut threadedly coupled to the bolt.

Rear crossbar mounting portion 402 includes two mounting panels that set firmly on bracket mounting portion 401, and two mounting panels are arranged on bracket mounting portion 401 at a distance from front to back, has respectively seted up a mounting hole 4021 on two mounting panels, and the mounting hole 4021 on two mounting panels corresponds and arranges, and rear crossbar mounting bracket 4 is connected with the one end of the rear crossbar of vehicle suspension through the rear crossbar connecting piece that wears to locate in mounting hole 4021. In a preferred embodiment, the rear cross arm connector includes a bolt inserted through the corresponding mounting hole 4021, and a nut threadedly coupled to the bolt.

In order to improve the connection reliability, a locking portion 4022 is formed on the circumferential side of the mounting hole 4021, and the locking portion 4022 engages with an external member to limit the loosening of the nut. In a preferred embodiment, the anti-loosening portion 4022 is an inwardly recessed groove formed in the mounting plate of the rear crossbar mounting portion 402, and the groove is preferably a square groove around the circumference of the ring mounting hole 4021, so as to cooperate with an external member, such as an existing four-wheel adjusting washer, to limit the loosening of the nut.

In the above mechanism, the rear cross beam via hole 301, the bracket via hole 4011, and the bracket connecting piece 302 penetrating through the rear cross beam via hole and the bracket via hole are the connecting structures between the rear cross beam 3 and each rear cross arm mounting bracket 4, in addition, the rear cross beam 3 and the rear cross arm mounting bracket 4 can be connected by rivets, but the effect is poor. In addition to the fact that only the rear cross member via hole 301 on the rear cross member 3 may be a strip-shaped hole, only the bracket via hole 4011 on the rear cross member mounting bracket 4 may be a strip-shaped hole, or both the rear cross member 3 and the rear cross member mounting bracket 4 may be provided with a strip-shaped hole, except that the length direction of the strip-shaped hole is extended in the width direction of the vehicle.

Finally, it should be noted that, in the above structure, the rear cross beam 3, the front cross beam 2 and the two rear cross arm mounting brackets 4 are preferably formed by extrusion or hydraulic process of wrought aluminum alloy, and the type of the aluminum alloy is preferably the existing 6061, so that the rear sub-frame is lighter in overall weight and lower in cost.

The back sub vehicle frame of this embodiment, through making the position of back xarm installing support 4 adjustable on the back sub vehicle frame, and be equipped with connection structure between back crossbeam 3 and back xarm installing support 4, and because of this connection, back xarm installing support 4 can be fixed a position in a plurality of different positions of 3 length direction of back crossbeam, therefore the development of reducible back xarm, reduce the development cycle and the cost of back xarm, and can improve the commonality of this back sub vehicle frame, thereby reduce the development cycle and the cost of back sub vehicle frame, better practicality has.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A rear sub-frame comprising two longitudinal beams (1) extending in a length direction of a vehicle, the two longitudinal beams (1) being opposed to each other in a width direction of the vehicle, and a front cross member (2) and a rear cross member (3) extending in the width direction of the vehicle being connected between the two longitudinal beams (1), and the front cross member (2) and the rear cross member (3) being arranged front and rear in the length direction of the vehicle, characterized in that the rear sub-frame further comprises:

two rear cross arm mounting brackets (4) which are mounted on the rear cross beam (3) and are respectively connected with two rear cross arms of a suspension of the vehicle;

and a connecting structure provided between the rear cross beam (3) and each rear cross arm mounting bracket (4) to constitute a connection between the rear cross arm mounting bracket (4) and the rear cross beam (3), and each rear cross arm mounting bracket (4) can be positioned at a plurality of different positions in the length direction of the rear cross beam (3) due to the connection.

2. The rear subframe of claim 1 wherein: the connecting structure comprises through holes correspondingly formed in the rear cross beam (3) and the rear cross arm mounting supports (4) and bracket connecting pieces (302) penetrating through the through holes correspondingly, the through holes in the rear cross beam (3) and/or the rear cross arm mounting supports (4) are strip-shaped holes, and the length direction of each strip-shaped hole extends along the length direction of the rear cross beam (3).

3. The rear subframe of claim 2 wherein: the rear cross beam (3) is of a hollow tubular structure, and the cross section of the rear cross beam (3) is in a square ring shape.

4. The rear subframe of claim 3 wherein: each rear cross arm mounting bracket (4) comprises an inverted U-shaped bracket mounting part (401) and a rear cross arm mounting part (402) integrally and fixedly connected to the bracket mounting part (401); the rear cross arm mounting bracket (4) is characterized in that a through hole is formed in the mounting portion, a mounting hole (4021) is formed in the rear cross arm mounting portion (402), and the rear cross arm mounting bracket (4) is connected with the rear cross arm through a rear cross arm connecting piece penetrating through the mounting hole (4021).

5. The rear subframe of claim 4 wherein: back xarm installation department (402) including set firmly in two mounting panels on support installation department (401), and two mounting panels in interval arrangement around on support installation department (401), in two all seted up on the mounting panel mounting hole (4021), back xarm connecting piece is including wearing to locate bolt in mounting hole (4021), and with the nut that the bolt spiro union links to each other.

6. The rear subframe of claim 5 wherein: a locking part (4022) is formed on the periphery of the mounting hole (4021), and the locking part (4022) is matched with an external member to limit the reverse loosening of the nut.

7. The rear subframe of claim 1 wherein: the front cross beam (2) is of a hollow tubular structure, the cross section of the front cross beam (2) is circular, and two ends of the front cross beam (2) are bent downwards relative to the middle.

8. The rear subframe of claim 1 wherein: the two longitudinal beams (1) are tubular structures with through holes formed inside, a front mounting position sleeve (101) is integrally constructed at the front end of each longitudinal beam (1), a rear mounting position sleeve (102) is integrally constructed at the rear end of each longitudinal beam (1), shaft sleeve holes are formed in the front mounting position sleeve (101) and the rear mounting position sleeve (102) respectively, and the shaft sleeve holes are communicated with the through holes respectively.

9. The rear subframe of claim 8 wherein: the front connecting part (103) connected with the front cross beam (2) and the rear connecting part (104) connected with the rear cross beam (3) are integrally formed on the longitudinal beam (1), communicating holes communicated with the through holes are formed in the front connecting part (103) and the rear connecting part (104), a positioning part (105) is formed in at least one of the communicating holes, and the positioning part (105) forms prepositioning before the longitudinal beam (1) and the front cross beam (2) are fixedly connected.

10. The rear subframe of any one of claims 1-9 wherein: the rear cross beam (3), the front cross beam (2) and the two rear cross arm mounting brackets (4) are all formed by adopting wrought aluminum alloy extrusion/hydraulic forming, and the longitudinal beams (1) are formed by adopting cast aluminum alloy casting.

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