Rear subframe, rear axle assembly and vehicle

Abstract

The present disclosure provides a rear subframe, a rear axle assembly and a vehicle, belonging to the field of vehicle technology. The rear subframe includes a front crossbeam, a rear crossbeam, a left longitudinal beam, a right longitudinal beam and an intermediate crossbeam. The front crossbeam and the rear crossbeam are arranged relative to each other, the two ends of the left longitudinal beam are connected to the front crossbeam and the rear crossbeam respectively, the two ends of the right longitudinal beam are connected to the front crossbeam and the rear crossbeam respectively, and the left longitudinal beam and the right longitudinal beam are arranged relative to each other, and the two ends of the intermediate crossbeam are connected to the left longitudinal beam and the right longitudinal beam respectively. The front crossbeam is provided with a third mounting structure and a fourth mounting structure. When the rear subframe is applied to a vehicle with rear wheel steering, the rear wheel steering motor is mounted on the left longitudinal beam and the right longitudinal beam through the third mounting structure and the fourth mounting structure. When the rear subframe is applied to a vehicle without rear wheel steering, the supporting crossbeam is connected to the left longitudinal beam and the right longitudinal beam through the third mounting structure and the fourth mounting structure. This allows the rear subframe to be applied to both vehicles with rear wheel steering and vehicles without rear wheel steering.

Description

Technical Field

[0001] The present disclosure relates to the technical field of vehicles, and in particular to a rear subframe, a rear axle assembly and a vehicle. Background Art

[0002] The rear subframe is a component of the car's axle. The rear subframe is connected to the car's wheel hub through the control arm and to the car body through the suspension. It can reduce the vibration generated by the car during driving and improve the comfort of the car.

[0003] The rear subframe in the related art includes a front crossbeam, a right longitudinal beam, a left longitudinal beam and a rear crossbeam. When the rear subframe is installed in a vehicle with rear wheel steering, a rear wheel steering motor is installed between the right longitudinal beam and the left longitudinal beam to realize the rear wheel steering function of the vehicle. When the rear subframe is installed in a vehicle without rear wheel steering, the rear wheel steering motor is not installed between the right longitudinal beam and the left longitudinal beam.

[0004] In order to reduce manufacturing costs, it is considered to install the rear subframe in a vehicle with rear-wheel steering in a vehicle without rear-wheel steering. If the rear subframe is directly used in a vehicle without rear-wheel steering after only the rear-wheel steering motor is removed, the overall rigidity of the rear subframe will be affected, making it difficult to use the rear subframe in both a vehicle with rear-wheel steering and a vehicle without rear-wheel steering. Summary of the invention

[0005] The present disclosure provides a rear subframe, a rear axle assembly and a vehicle, which can solve the technical problems existing in the related technologies. The technical solutions of the rear subframe, the rear axle assembly and the vehicle are as follows:

[0006] In a first aspect, the present disclosure provides a rear subframe, the rear subframe comprising a front crossbeam, a rear crossbeam, a left longitudinal beam, a right longitudinal beam and a middle crossbeam;

[0007] The front cross beam and the rear cross beam are arranged opposite to each other, the two ends of the left longitudinal beam are respectively connected to the front cross beam and the rear cross beam, the two ends of the right longitudinal beam are respectively connected to the front cross beam and the rear cross beam, and the left longitudinal beam and the right longitudinal beam are arranged opposite to each other;

[0008] The two ends of the middle cross beam are respectively connected to the left longitudinal beam and the right longitudinal beam;

[0009] The portion of the front cross beam close to the left longitudinal beam and the portion close to the right longitudinal beam respectively have a first mounting structure and a second mounting structure, and the portion of the left longitudinal beam close to the front cross beam and the portion of the right longitudinal beam close to the front cross beam respectively have a third mounting structure and a fourth mounting structure;

[0010] When the rear subframe is applied to a vehicle with rear-wheel steering, the rear-wheel steering motor is connected to the left longitudinal beam and the right longitudinal beam through the third mounting structure and the fourth mounting structure respectively;

[0011] When the rear subframe is applied to a vehicle without rear-wheel steering, the supporting crossbeam is connected to the left longitudinal beam and the right longitudinal beam through the third mounting structure and the fourth mounting structure respectively, and the left bracket of the main control arm is connected to the front crossbeam through the first mounting structure, and the right bracket of the main control arm is connected to the front crossbeam through the second mounting structure, and the left bracket of the main control arm and the right bracket of the main control arm are respectively used for mounting the main control arm.

[0012] In a possible implementation, the third mounting structure and the fourth mounting structure are both boss structures having mounting holes.

[0013] In a possible implementation, the left longitudinal beam and the right longitudinal beam both protrude upward relative to the front cross beam;

[0014] The third mounting structure is located at a portion of the left longitudinal beam that protrudes upward relative to the front cross beam and faces the front side, and the fourth mounting structure is located at a portion of the right longitudinal beam that protrudes upward relative to the front cross beam and faces the front side.

[0015] In a possible implementation, the middle cross beam has a rear lower left bracket at one end close to the left longitudinal beam, and has a rear lower right bracket at one end close to the right longitudinal beam;

[0016] The rear lower left bracket and the rear lower right bracket are both used for installing the rear lower control arm.

[0017] In a possible implementation, the middle portion of the front cross beam has a front suspension fixing hole, and the left and right sides respectively have a front lower left bracket and a front lower right bracket, the front suspension fixing hole is used to fix the motor front suspension, and the front lower left bracket and the front lower right bracket are both used to install the front lower control arm;

[0018] The rear cross beam has a rear suspension left fixing bracket and a rear suspension right fixing bracket, and the rear suspension left fixing bracket and the rear suspension right fixing bracket are used to fix the motor rear suspension;

[0019] The front side and rear side of the left longitudinal beam respectively have a front upper left bracket and a rear upper left bracket, and the front side and rear side of the right longitudinal beam respectively have a front upper right bracket and a rear upper right bracket, the front upper left bracket and the front upper right bracket are both used to install the front upper control arm, and the rear upper left bracket and the rear upper right bracket are both used to install the rear upper control arm.

[0020] In a second aspect, the present disclosure provides a rear axle assembly having the above-mentioned rear subframe.

[0021] In a possible implementation, the rear axle assembly includes two front lower control arms, two main control arms, two front upper control arms, two rear upper control arms, two rear lower control arms, a rear wheel steering motor and the rear subframe;

[0022] The two front lower control arms are respectively connected to the left and right sides of the front cross beam;

[0023] The rear wheel steering motor is connected to the left longitudinal beam and the right longitudinal beam through the third mounting structure and the fourth mounting structure respectively, and the two main control arms are connected to the two ends of the rear wheel steering motor respectively;

[0024] The two front upper control arms are respectively connected to the front side of the left longitudinal beam and the front side of the right longitudinal beam;

[0025] The two rear upper control arms are respectively connected to the rear side of the left longitudinal beam and the rear side of the right longitudinal beam;

[0026] The two rear lower control arms are respectively connected to two ends of the middle cross beam.

[0027] In a possible implementation, the rear axle assembly includes two front lower control arms, two main control arms, two front upper control arms, two rear upper control arms, two rear lower control arms, a supporting crossbeam, a main control arm left bracket, a main control arm right bracket and the rear subframe;

[0028] The two front lower control arms are respectively connected to the left and right sides of the front cross beam;

[0029] The left main control arm bracket and the right main control arm bracket are connected to the front crossbeam through the first mounting structure and the second mounting structure respectively, and the two main control arms are connected to the left main control arm bracket and the right main control arm bracket respectively;

[0030] The two front upper control arms are respectively connected to the front side of the left longitudinal beam and the front side of the right longitudinal beam;

[0031] The two rear upper control arms are respectively connected to the rear side of the left longitudinal beam and the rear side of the right longitudinal beam;

[0032] The two rear lower control arms are respectively connected to two ends of the middle cross beam;

[0033] The supporting cross beam is connected to the left longitudinal beam and the right longitudinal beam through the third mounting structure and the fourth mounting structure respectively.

[0034] In a possible implementation, the supporting crossbeam includes a crossbeam body, a left sleeve and a right sleeve;

[0035] The left sleeve and the right sleeve are respectively connected to two ends of the beam body.

[0036] In a third aspect, the present disclosure provides a vehicle, comprising the above-mentioned rear subframe.

[0037] The technical solution provided by the present disclosure includes at least the following beneficial effects:

[0038] The present disclosure provides a rear subframe, which includes a front crossbeam, a rear crossbeam, a left longitudinal beam, a right longitudinal beam and an intermediate crossbeam, and a third mounting structure and a fourth mounting structure are arranged on the front crossbeam. When the rear subframe is applied to a vehicle with rear-wheel steering, the rear-wheel steering motor is mounted on the left longitudinal beam and the right longitudinal beam through the third mounting structure and the fourth mounting structure, and two main control arms are respectively connected to the two ends of the rear-wheel steering motor, so as to realize the rear-wheel steering function of the vehicle. When the rear subframe is applied to a vehicle without rear-wheel steering, the supporting crossbeam can be connected to the left longitudinal beam and the right longitudinal beam through the third mounting structure and the fourth mounting structure, and the two main control arms are hinged to the front crossbeam through the main control arm left bracket and the main control arm right bracket connected to the first mounting structure and the second mounting structure, so as to strengthen the overall rigidity of the rear subframe. Therefore, the subframe can be applied to both vehicles with rear-wheel steering and vehicles without rear-wheel steering.

[0039] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The accompanying drawings herein are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the description, are used to explain the principles of the present disclosure. In the drawings:

[0041] Figure 1 is a schematic diagram of a rear subframe shown in an embodiment of the present disclosure;

[0042] Figure 2 is a schematic diagram of a rear subframe shown in an embodiment of the present disclosure;

[0043] Figure 3 is a front view of a rear subframe shown in an embodiment of the present disclosure;

[0044] Figure 4 is a top view of a rear subframe shown in an embodiment of the present disclosure;

[0045] Figure 5 is a schematic diagram of a rear axle assembly shown in an embodiment of the present disclosure;

[0046] Figure 6 is a schematic diagram of a rear axle assembly shown in an embodiment of the present disclosure;

[0047] Figure 7 It is a schematic diagram of a supporting beam shown in an embodiment of the present disclosure.

[0048] Legend:

[0049] 1. front cross beam, 10a. first mounting structure, 10b. second mounting structure, 11. front lower left bracket, 12. front lower right bracket, 13. main control arm left bracket, 14. main control arm right bracket, 15. front suspension fixing hole, 16. front bushing;

[0050] 2. rear crossbeam, 21. rear suspension left fixed bracket, 22. rear suspension right fixed bracket, 23. rear casing;

[0051] 3. left longitudinal beam, 31. third mounting structure, 32. front upper left bracket, 33. rear upper left bracket, 34. left front sleeve, 35. left rear sleeve;

[0052] 4. right longitudinal beam, 41. fourth mounting structure, 42. front upper right bracket, 43. rear upper right bracket;

[0053] 5. middle cross beam, 51. rear lower left bracket, 52. rear lower right bracket, 5a. connecting plate, 5b. first connecting structure, 5c. second connecting structure;

[0054] 01. Front lower control arm;

[0055] 02. Main control arm;

[0056] 03. Front upper control arm;

[0057] 04. Rear upper control arm;

[0058] 05. Rear lower control arm;

[0059] 06. Rear wheel steering motor;

[0060] 07. Support beam;

[0061] 08. Rear subframe.

[0062] The above drawings show clear embodiments of the present disclosure, which will be described in more detail below. These drawings and text descriptions are not intended to limit the scope of the present disclosure in any way, but to illustrate the concepts of the present disclosure to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0063] In order to make the objectives, technical solutions and advantages of the present disclosure more clear, the embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings.

[0064] The terms used in the embodiments of the present disclosure are only used to explain the embodiments of the present disclosure, and are not intended to limit the present disclosure. Unless otherwise defined, the technical terms or scientific terms used herein should be understood by people with ordinary skills in the field to which the present disclosure belongs. The words "first", "second", "third" and similar words used in the patent application specification and claims of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not indicate a quantity limit, but indicate that there is at least one. Words such as "include" or "include" mean that the elements or objects appearing in front of "include" or "include" include the elements or objects listed after "include" or "include" and their equivalents, and do not exclude other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0065] The embodiment of the present disclosure provides a rear subframe, such as Figure 1-Figure 4 As shown, the rear subframe includes a front crossbeam 1, a rear crossbeam 2, a left longitudinal beam 3, a right longitudinal beam 4 and an intermediate crossbeam 5. The front crossbeam 1 and the rear crossbeam 2 are arranged relative to each other, the two ends of the left longitudinal beam 3 are connected to the front crossbeam 1 and the rear crossbeam 2 respectively, the two ends of the right longitudinal beam 4 are connected to the front crossbeam 1 and the rear crossbeam 2 respectively, and the left longitudinal beam 3 and the right longitudinal beam 4 are arranged relative to each other. The two ends of the intermediate crossbeam 5 are connected to the left longitudinal beam 3 and the right longitudinal beam 4 respectively. The part of the front crossbeam 1 close to the left longitudinal beam 3 and the part close to the right longitudinal beam 4 respectively have a first mounting structure 10a and a second mounting structure 10b, and the part of the left longitudinal beam 3 close to the front crossbeam 1 and the part of the right longitudinal beam 4 close to the front crossbeam 1 respectively have a third mounting structure 31 and a fourth mounting structure 41. When the rear subframe is applied to a vehicle with rear wheel steering, the rear wheel steering motor 06 is connected to the left longitudinal beam 3 and the right longitudinal beam 4 through the third mounting structure 31 and the fourth mounting structure 41 respectively. When the rear subframe is applied to a vehicle without rear-wheel steering, the supporting crossbeam 07 is connected to the left longitudinal beam 3 and the right longitudinal beam 4 through the third mounting structure 31 and the fourth mounting structure 41 respectively, and the main control arm left bracket 13 is connected to the front crossbeam 1 through the first mounting structure 10a, and the main control arm right bracket 14 is connected to the front crossbeam 1 through the second mounting structure 10b. The main control arm left bracket 13 and the main control arm right bracket 14 are respectively used to install the main control arm 02.

[0066] Among them, the front cross beam 1, the rear cross beam 2, the left longitudinal beam 3, the right longitudinal beam 4 and the middle cross beam 5 are an integrated aluminum alloy hollow casting structure. Compared with the rear subframe welded by extrusion parts and casting parts, the rear subframe with an integrated aluminum alloy hollow casting structure has higher dimensional accuracy, and there is no need to reserve overlap to ensure welding performance, and there are no welding defects, so that the rear subframe provided by the embodiment of the present disclosure has better material and mechanical properties, and can also reduce costs. In addition, compared with the steel subframe of the same level, the rear subframe provided by the embodiment of the present disclosure can reduce weight by more than 33%.

[0067] The technical solution provided by the embodiment of the present disclosure is that the front cross beam 1 is provided with a third mounting structure 31 and a fourth mounting structure 41. When the rear subframe is applied to a vehicle with rear wheel steering, the rear wheel steering motor 06 is mounted on the left longitudinal beam 3 and the right longitudinal beam 4 through the third mounting structure 31 and the fourth mounting structure 41, and the two main control arms 02 are respectively connected to the two ends of the rear wheel steering motor 06, so as to realize the rear wheel steering function. When the rear subframe is applied to a vehicle without rear wheel steering, the supporting cross beam 07 can be connected to the left longitudinal beam 3 and the right longitudinal beam 4 through the third mounting structure 31 and the fourth mounting structure 41, and the two main control arms are hinged to the front cross beam 1 through the main control arm left bracket 13 and the main control arm right bracket 14 connected to the first mounting structure 10a and the second mounting structure 10b, so as to strengthen the overall rigidity of the rear subframe. Therefore, the rear subframe can be applied to both vehicles with rear wheel steering and vehicles without rear wheel steering.

[0068] In some examples, such as Figure 1 As shown, the first mounting structure 10a includes two mounting holes, and the second mounting structure 10b includes two mounting holes.

[0069] like Figure 1 and Figure 5 As shown, when the rear subframe is applied to a vehicle with rear-wheel steering, the first mounting structure 10a and the second mounting structure 10b are not used to fix other components.

[0070] like Figure 2 , Figure 4 and Figure 6 As shown, when the rear subframe is applied to a vehicle with rear-wheel steering, the first mounting structure 10 a is used to mount the left main control arm bracket 13 , and the second mounting structure 10 b is used to mount the right main control arm bracket 14 .

[0071] The installation method of the main control arm left bracket 13 and the main control arm right bracket 14 can be described as follows:

[0072] The mounting hole of the left bracket 13 of the main control arm is aligned with the mounting hole of the first mounting structure 10a, and the left bracket 13 of the main control arm is fixed to the first mounting structure 10a by bolts, and then fixed to the left side of the front cross beam 1. The mounting hole of the right bracket 14 of the main control arm is aligned with the mounting hole of the second mounting structure 10b, and the right bracket 14 of the main control arm is fixed to the second mounting structure 10b by bolts, and then fixed to the right side of the front cross beam 1.

[0073] In some examples, such as Figure 1 and Figure 2 As shown, the third mounting structure 31 and the fourth mounting structure 41 are both boss structures with mounting holes.

[0074] In this way, the mounting surface can be processed on the boss structure so that the mounting surface has a high flatness. Therefore, when the rear-wheel steering motor 06 or the supporting beam 07 is connected to the third mounting structure 31 and the fourth mounting structure 41, it can be ensured that the mounting surfaces of the third mounting structure 31 and the fourth mounting structure 41 are well matched with the mounting surfaces of the rear-wheel steering motor 06 or the supporting beam 07, ensuring high installation accuracy and avoiding additional vibration of the rear-wheel steering motor 06 or the supporting beam 07.

[0075] In some examples, such as Figure 1-Figure 3 As shown, the left longitudinal beam 3 and the right longitudinal beam 4 both protrude upward relative to the front cross beam 1. In some examples, such as Figure 1 and Figure 2 As shown, the third mounting structure 31 is located at the portion of the left longitudinal beam 3 that protrudes upward relative to the front cross beam 1 and faces the front side, and the fourth mounting structure 41 is located at the portion of the right longitudinal beam 4 that protrudes upward relative to the front cross beam 1 and faces the front side.

[0076] This makes it easy to install the rear wheel steering motor 06 or the supporting crossbeam 07 at the position of the left longitudinal beam 3 and the right longitudinal beam 4 close to the front crossbeam 1 without interfering with the front crossbeam 1 .

[0077] In some examples, such as Figure 1-Figure 4 As shown, the middle cross beam 5 has a rear lower left bracket 51 at one end close to the left longitudinal beam 3 , and has a rear lower right bracket 52 at one end close to the right longitudinal beam 4 .

[0078] like Figure 3 and Figure 4 As shown, the middle cross beam 5 also includes a cross beam body 50, and the two ends of the cross beam body 50 are respectively connected to the rear lower left bracket 51 and the rear lower right bracket 52. The rear lower left bracket 51 and the rear lower right bracket 52 are both composed of two oppositely arranged connecting plates, and the connecting plates have mounting holes.

[0079] The rear lower left bracket 51 and the rear lower right bracket 52 are used to install the rear lower control arm 05, and the rear lower control arm 05 will generate a large lateral pulling force on the rear lower left bracket 51 and the rear lower right bracket 52. The rear lower left bracket 51 and the rear lower right bracket 52 are designed as an integrated structure with the middle cross beam 5, the left longitudinal beam 3, and the right longitudinal beam 4, which can improve the rigidity of the rear lower left bracket 51 and the rear lower right bracket 52 and avoid deformation of the rear lower left bracket 51 and the rear lower right bracket 52 due to large force.

[0080] In some examples, such as Figure 1 and Figure 2 As shown, the middle part of the front cross beam 1 has a front suspension fixing hole 15, and the left and right sides have a front lower left bracket 11 and a front lower right bracket 12 respectively. The front suspension fixing hole 15 is used to fix the motor front suspension, and the front lower left bracket 11 and the front lower right bracket 12 are both used to install the front lower control arm 01. The motor front suspension is press-fitted into the front cross beam 1 through the front suspension fixing hole 15, which can effectively improve the stiffness and mode of the front suspension fixing hole 15.

[0081] The front lower left bracket 11 and the front lower right bracket 12 are cast on the front cross beam 1. The front lower left bracket 11 and the front lower right bracket 12 are two bosses with bolt holes. The bosses have a high flatness, which can ensure the installation accuracy of the front lower control arm 01 and the front lower left bracket 11 and the front lower right bracket 12, and avoid the difficulty in assembling the front lower control arm 01 or insufficient bolt tightening torque due to the uneven installation surface.

[0082] In some examples, such as Figure 1 and Figure 2 As shown, the rear cross beam 2 has a rear suspension left fixed bracket 21 and a rear suspension right fixed bracket 22, and the rear suspension left fixed bracket 21 and the rear suspension right fixed bracket 22 are used to fix the rear suspension of the motor. The rear suspension left fixed bracket 21 consists of two parts, one part is a holed connecting plate located on the rear cross beam near the left end of the rear cross beam 2, and the holed connecting plate is fixed to the rear cross beam by welding. The other part is a part protruding upward from the left end of the rear cross beam 2, which faces the right side and has a bolt hole. The rear suspension right fixed bracket 22 consists of two parts, one part is a holed connecting plate located on the rear cross beam near the right end of the rear cross beam 2, and the holed connecting plate is fixed to the rear cross beam by welding. The other part is a part protruding upward from the right end of the rear cross beam 2, which faces the left side and has a bolt hole.

[0083] The mounting holes of the motor rear suspension are aligned with the mounting holes of the rear suspension left fixing bracket 21 and the mounting holes of the rear suspension right fixing bracket 22, respectively, and the motor rear suspension is connected to the rear cross beam 2 by bolts. The protruding portion on the rear cross beam 2 is used as a part of the structure of the rear suspension left fixing bracket 21 and the rear suspension right fixing bracket 22, which can reduce the use of connecting plates and enhance the connection strength between the motor rear suspension and the rear cross beam 2.

[0084] In some examples, such as Figure 1 , Figure 2 and Figure 4 As shown, the front and rear sides of the left longitudinal beam 3 respectively have a front upper left bracket 32 ​​and a rear upper left bracket 33, and the front and rear sides of the right longitudinal beam 4 respectively have a front upper right bracket 42 and a rear upper right bracket 43. The front upper left bracket 32 ​​and the front upper right bracket 42 are both used to install the front upper control arm 03, and the rear upper left bracket 33 and the rear upper right bracket 43 are both used to install the rear upper control arm 04.

[0085] In some examples, the front upper left bracket 32, the rear upper left bracket 33, the front upper right bracket 42, and the rear upper right bracket 43 are two oppositely arranged perforated connecting plates, and the perforated connecting plates are cast on the left longitudinal beam 3 and the right longitudinal beam 4, respectively.

[0086] In some examples, such as Figure 1-Figure 4 As shown, both ends of the front cross member 1 have front bushings 16 , and both ends of the rear cross member 2 have rear sleeves 23 . The front bushings 16 and the rear sleeves 23 are used to connect the rear subframe 08 to the vehicle body.

[0087] The disclosed embodiment also provides a rear axle assembly, such as Figure 5 and Figure 6 As shown, the rear axle assembly has the above-mentioned rear subframe 08.

[0088] The rear axle assembly provided in the embodiment of the present disclosure may have a rear wheel steering function or may not have a rear wheel steering function. The following are exemplary descriptions respectively:

[0089] (1) The rear axle assembly has rear wheel steering function.

[0090] like Figure 1 and Figure 5 As shown, the first mounting structure 10 a and the second mounting structure 10 b on the front cross beam 1 are not used for mounting other components.

[0091] like Figure 5 As shown, the rear axle assembly includes two front lower control arms 01, two main control arms 02, two front upper control arms 03, two rear upper control arms 04, two rear lower control arms 05, a rear wheel steering motor 06 and a rear subframe 08.

[0092] The two front lower control arms 01 are connected to the left and right sides of the front cross member 1 respectively.

[0093] Exemplarily, the mounting holes of the connecting plate on the front lower control arm 01 are opposite to the bolt holes of the front lower left bracket 11 and the front lower right bracket 12 , and the front lower control arm 01 is mounted on the front cross beam 1 by bolts, and the control arm 01 is hinged to the front cross beam 1 .

[0094] The rear wheel steering motor 06 is connected to the left longitudinal beam 3 and the right longitudinal beam 4 through the third mounting structure 31 and the fourth mounting structure 41 respectively, and the two main control arms 02 are connected to the two ends of the rear wheel steering motor 06 respectively.

[0095] Exemplarily, the rear wheel steering motor 06 has a steering gear left mounting structure 061 and a steering gear right mounting structure 062, the mounting hole of the steering gear left mounting structure 061 is aligned with the mounting hole of the third mounting structure 31, and the rear wheel steering motor 06 is fixed to the left longitudinal beam 3 by bolts. The steering gear right mounting structure 062 is aligned with the mounting hole of the fourth mounting structure 41, and the rear wheel steering motor 06 is fixed to the right longitudinal beam 4 by bolts.

[0096] The two front upper control arms 03 are connected to the front side of the left longitudinal beam 3 and the front side of the right longitudinal beam 4 respectively.

[0097] Exemplarily, the mounting hole of one front upper control arm 03 is aligned with the mounting hole of the front upper left bracket 32, and the front upper control arm 03 is mounted on the front side of the left longitudinal beam 3 by bolts and nuts, and the control arm 03 is hinged to the front side of the left longitudinal beam 3. The mounting hole of another front upper control arm 03 is aligned with the mounting hole of the front upper right bracket 42, and the front upper control arm 03 is fixed to the front side of the right longitudinal beam 4 by bolts and nuts.

[0098] The two rear upper control arms 04 are connected to the rear side of the left longitudinal beam 3 and the rear side of the right longitudinal beam 4 respectively.

[0099] Exemplarily, the mounting hole of one rear upper control arm 04 is aligned with the mounting hole of the rear upper left bracket 33, and the rear upper control arm 04 is mounted on the rear side of the left longitudinal beam 3 by bolts and nuts, and the control arm 04 is hinged to the rear side of the left longitudinal beam 3. The mounting hole of another rear upper control arm 04 is aligned with the mounting hole of the rear upper right bracket 43, and the rear upper control arm 04 is fixed to the rear side of the right longitudinal beam 4 by bolts and nuts.

[0100] The two rear lower control arms 05 are connected to the two ends of the middle cross beam 5 respectively.

[0101] Exemplarily, the mounting hole of one rear lower control arm 05 is aligned with the mounting hole of the rear lower left bracket 51, and the mounting hole of the other rear lower control arm 05 is aligned with the mounting hole of the rear lower right bracket 52, and the two rear lower control arms 05 are installed on the two ends of the middle cross beam 5 by bolts and nuts, and the two rear lower control arms 05 are hinged to the two ends of the middle cross beam 5 respectively.

[0102] (2) The rear axle assembly does not have rear wheel steering function

[0103] like Figure 2 , Figure 4 and Figure 6As shown, the first mounting structure 10 a is used to mount the left bracket 13 of the main control arm, and the second mounting structure 10 b is used to mount the right bracket 14 of the main control arm.

[0104] like Figure 6 As shown, the rear axle assembly includes two front lower control arms 01, two main control arms 02, two front upper control arms 03, two rear upper control arms 04, two rear lower control arms 05, a supporting crossbeam 07, a main control arm left bracket 13, a main control arm right bracket 14 and a rear subframe 08.

[0105] The two front lower control arms 01 are connected to the left and right sides of the front cross member 1 respectively.

[0106] Exemplarily, the main control arm left bracket 13 and the main control arm right bracket 14 are connected to the front cross beam 1 through the first mounting structure 10a and the second mounting structure 10b respectively, and the two main control arms 02 are connected to the main control arm left bracket 13 and the main control arm right bracket 14 respectively, the mounting hole of one main control arm 02 is aligned with the mounting hole of the main control arm left bracket 13, and the mounting hole of the other main control arm 02 is aligned with the mounting hole of the main control arm right bracket 14, and the two main control arms 02 are fixed to the left and right sides of the front cross beam 1 by bolts and nuts.

[0107] The two front upper control arms 03 are respectively connected to the front side of the left longitudinal beam 3 and the front side of the right longitudinal beam 4, the two rear upper control arms 04 are respectively connected to the rear side of the left longitudinal beam 3 and the rear side of the right longitudinal beam 4, and the two rear lower control arms 05 are respectively connected to the two ends of the middle cross beam 5.

[0108] The specific connection method of the front upper control arm 03, the rear upper control arm 04 and the rear lower control arm 05 is the same as that of the front upper control arm 03, the rear upper control arm 04 and the rear lower control arm 05 of the rear axle assembly with rear-wheel steering function, and will not be repeated here.

[0109] The support crossbeam 07 is connected to the left longitudinal beam 3 and the right longitudinal beam 4 respectively through the third mounting structure 31 and the fourth mounting structure 41. Since the front upper control arm 03 will generate a large lateral force on the front upper left bracket 32 ​​and the front upper right bracket 42, the support crossbeam 07 is installed on the left longitudinal beam 3 and the right longitudinal beam 4 to improve the rigidity of the front upper left bracket 32 ​​and the front upper right bracket 42, and avoid deformation of the front upper left bracket 32 ​​and the front upper right bracket 42 due to the large force.

[0110] In some examples, such as Figure 6 As shown, the supporting crossbeam 07 includes a crossbeam body 071 , a left sleeve 072 and a right sleeve 073 , and the left sleeve 072 and the right sleeve 073 are respectively connected to two ends of the crossbeam body 071 .

[0111] The left sleeve 072 and the right sleeve 073 are respectively connected to the third mounting structure 31 and the fourth mounting structure 41 by bolts. The thickness of the left sleeve 072 and the right sleeve 073 is greater than the thickness of the supporting crossbeam 07, so that when the left sleeve 072 and the right sleeve 073 are connected to the third mounting structure 31 and the fourth mounting structure 41, the crossbeam body 071 will not contact other parts, avoiding deformation of the crossbeam body 071 due to extrusion.

[0112] The crossbeam body 071 is made of aluminum alloy profiles, and the left sleeve 072 and the right sleeve 073 are both aluminum sleeves and welded to both ends of the crossbeam body 071. The longitudinal section of the crossbeam body 071 is trapezoidal, which can reduce the space occupied by the crossbeam body 071 while ensuring the support strength, so as to facilitate the installation of other devices.

[0113] The disclosed embodiment further provides a vehicle having the above-mentioned rear subframe 08 .

[0114] If the vehicle has a rear-wheel steering function, the rear-wheel steering motor 06 is installed on the rear subframe 08, and the main control arm 02 is installed on both sides of the rear-wheel steering motor 06, so as to realize the rear-wheel steering function of the vehicle.

[0115] If the vehicle does not have the rear wheel steering function, the rear axle assembly has a support crossbeam 07, which is installed on the left longitudinal beam 3 and the right longitudinal beam 4 instead of the rear wheel steering motor 06, so as to strengthen the overall rigidity of the rear subframe. The main control arm left bracket 13 and the main control arm right bracket 14 are connected to the left longitudinal beam 3 and the right longitudinal beam 4 through the first mounting structure 10a and the second mounting structure 10b respectively, and the main control arm 02 is installed on the main control arm left bracket 13 and the main control arm right bracket 14.

[0116] The above description is only an optional embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the principles of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A rear subframe, characterized in that: The rear subframe comprises a front crossbeam (1), a rear crossbeam (2), a left longitudinal beam (3), a right longitudinal beam (4) and a middle crossbeam (5); The front cross beam (1) and the rear cross beam (2) are arranged relative to each other, the two ends of the left longitudinal beam (3) are respectively connected to the front cross beam (1) and the rear cross beam (2), the two ends of the right longitudinal beam (4) are respectively connected to the front cross beam (1) and the rear cross beam (2), and the left longitudinal beam (3) and the right longitudinal beam (4) are arranged relative to each other; The two ends of the middle cross beam (5) are respectively connected to the left longitudinal beam (3) and the right longitudinal beam (4); The portion of the front cross beam (1) close to the left longitudinal beam (3) and the portion close to the right longitudinal beam (4) respectively have a first mounting structure (10a) and a second mounting structure (10b); the portion of the left longitudinal beam (3) close to the front cross beam (1) and the portion of the right longitudinal beam (4) close to the front cross beam (1) respectively have a third mounting structure (31) and a fourth mounting structure (41); When the rear subframe is used in a vehicle with rear-wheel steering, the rear-wheel steering motor (06) is connected to the left longitudinal beam (3) and the right longitudinal beam (4) respectively through the third mounting structure (31) and the fourth mounting structure (41); When the rear subframe is used in a vehicle without rear-wheel steering, the supporting crossbeam (07) is connected to the left longitudinal beam (3) and the right longitudinal beam (4) respectively through the third mounting structure (31) and the fourth mounting structure (41), and the main control arm left bracket (13) is connected to the front crossbeam (1) through the first mounting structure (10a), and the main control arm right bracket (14) is connected to the front crossbeam (1) through the second mounting structure (10b), and the main control arm left bracket (13) and the main control arm right bracket (14) are respectively used to mount the main control arm (02).

2. The rear subframe according to claim 1, characterized in that: The third mounting structure (31) and the fourth mounting structure (41) are both boss structures having mounting holes.

3. The rear subframe according to claim 1, characterized in that: The left longitudinal beam (3) and the right longitudinal beam (4) both protrude upward relative to the front cross beam (1); The third mounting structure (31) is located at a portion of the left longitudinal beam (3) that protrudes upward relative to the front cross beam (1) and faces the front side, and the fourth mounting structure (41) is located at a portion of the right longitudinal beam (4) that protrudes upward relative to the front cross beam (1) and faces the front side.

4. The rear subframe according to claim 1, characterized in that: The middle cross beam (5) has a rear lower left bracket (51) at one end close to the left longitudinal beam (3), and has a rear lower right bracket (52) at one end close to the right longitudinal beam (4); The rear lower left bracket (51) and the rear lower right bracket (52) are both used for installing the rear lower control arm (05).

5. The rear subframe according to any one of claims 1 to 4, characterized in that: The middle part of the front cross beam (1) has a front suspension fixing hole (15), and the left side and the right side respectively have a front lower left bracket (11) and a front lower right bracket (12), the front suspension fixing hole (15) is used to fix the front suspension of the motor, and the front lower left bracket (11) and the front lower right bracket (12) are both used to install the front lower control arm (01); The rear cross beam (2) comprises a rear suspension left fixing bracket (21) and a rear suspension right fixing bracket (22), wherein the rear suspension left fixing bracket (21) and the rear suspension right fixing bracket (22) are used to fix the rear suspension of the motor; The front side and rear side of the left longitudinal beam (3) are respectively provided with a front upper left bracket (32) and a rear upper left bracket (33); the front side and rear side of the right longitudinal beam (4) are respectively provided with a front upper right bracket (42) and a rear upper right bracket (43); the front upper left bracket (32) and the front upper right bracket (42) are both used for installing a front upper control arm (03); the rear upper left bracket (33) and the rear upper right bracket (43) are both used for installing a rear upper control arm (04).

6. A rear axle assembly, characterized in that: The rear axle assembly has a rear subframe (08) as claimed in any one of claims 1 to 5.

7. The rear axle assembly according to claim 6, characterized in that: The rear axle assembly comprises two front lower control arms (01), two main control arms (02), two front upper control arms (03), two rear upper control arms (04), two rear lower control arms (05), a rear wheel steering motor (06) and the rear subframe (08); The two front lower control arms (01) are respectively connected to the left and right sides of the front cross beam (1); The rear wheel steering motor (06) is connected to the left longitudinal beam (3) and the right longitudinal beam (4) respectively through the third mounting structure (31) and the fourth mounting structure (41), and the two main control arms (02) are connected to both ends of the rear wheel steering motor (06) respectively; The two front upper control arms (03) are respectively connected to the front side of the left longitudinal beam (3) and the front side of the right longitudinal beam (4); The two rear upper control arms (04) are respectively connected to the rear side of the left longitudinal beam (3) and the rear side of the right longitudinal beam (4); The two rear lower control arms (05) are respectively connected to the two ends of the middle cross beam (5).

8. The rear axle assembly according to claim 6, characterized in that: The rear axle assembly comprises two front lower control arms (01), two main control arms (02), two front upper control arms (03), two rear upper control arms (04), two rear lower control arms (05), a supporting crossbeam (07), a main control arm left bracket (13), a main control arm right bracket (14) and the rear subframe (08); The two front lower control arms (01) are respectively connected to the left and right sides of the front cross beam (1); The main control arm left bracket (13) and the main control arm right bracket (14) are respectively connected to the front cross beam (1) through the first mounting structure (10a) and the second mounting structure (10b), and the two main control arms (02) are respectively connected to the main control arm left bracket (13) and the main control arm right bracket (14); The two front upper control arms (03) are respectively connected to the front side of the left longitudinal beam (3) and the front side of the right longitudinal beam (4); The two rear upper control arms (04) are respectively connected to the rear side of the left longitudinal beam (3) and the rear side of the right longitudinal beam (4); The two rear lower control arms (05) are respectively connected to the two ends of the middle cross beam (5); The supporting cross beam (07) is connected to the left longitudinal beam (3) and the right longitudinal beam (4) respectively through the third mounting structure (31) and the fourth mounting structure (41).

9. The rear axle assembly according to claim 8, characterized in that: The supporting crossbeam (07) comprises a crossbeam body (071), a left sleeve (072) and a right sleeve (073); The left sleeve (072) and the right sleeve (073) are respectively connected to two ends of the crossbeam body (071).

10. A vehicle, characterized in that: The vehicle has the rear subframe according to any one of claims 1-5.

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