Rear subframe and car

Abstract

The present invention belongs to the technical field of automobile chassis, and in particular relates to a rear subframe and automobile. The left toe bracket of the rear subframe connects the left end lower portion of the front crossbeam and the front lower portion of the left longitudinal beam; the right toe bracket connects the right end lower portion of the front crossbeam and the front lower portion of the right longitudinal beam; the left lower arm bracket connects the left end lower portion of the rear crossbeam and the rear lower portion of the left longitudinal beam, and the right lower arm bracket connects the right end lower portion of the rear crossbeam and the rear lower portion of the right longitudinal beam; the left connecting bracket is connected between the left toe bracket and the left lower arm bracket; the right connecting bracket is connected between the right toe bracket and the right lower arm bracket. While meeting the durability and comfort requirements of the entire vehicle, the present invention improves the structural mode and performance of the rear subframe, achieves the goal of lightweighting, reduces production costs, and improves production efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile chassis, and in particular relates to a rear subframe and an automobile. Background Art

[0002] The rear subframe of a car is a very important component in the car chassis system. The rear subframe connects the body and suspension components, which can reduce the transmission of excitations such as road vibration and noise to the body. At the same time, the rear subframe can also increase the stiffness of the suspension, so that the whole vehicle has better durability and comfort.

[0003] Because the toe-in and lower control arm brackets significantly impact the vehicle's NVH (Noise, Vibration, Harshness) performance and lifespan, they are crucial load-transferring structures within the vehicle chassis system. Consequently, the design of the rear subframe places high demands on its structural modal properties, dynamic stiffness, and fatigue strength. In existing rear subframes, the toe-in and lower control arm brackets are typically cantilever structures, which fail to adequately balance the performance and lightweight requirements of the rear subframe. Specifically, improvements to the existing rear subframe modalities, dynamic stiffness, and fatigue strength of the mounting points of the toe bracket and lower control arm bracket are primarily achieved by increasing the cross-sections of the rear subframe's front and rear cross members and the thickness of the toe bracket and lower control arm bracket. This increases the weight of the rear subframe and complicates its cross-sectional features, hindering lightweighting requirements. This also increases production costs and reduces production efficiency. Furthermore, this solution does not ideally improve the rear subframe's structural modalities, stiffness, NVH, and other performance characteristics (stiffness is increased by approximately 50%, and structural modal performance is increased by approximately 30 Hz). Summary of the Invention

[0004] The technical problem to be solved by the present invention is: in view of the problem in the prior art that the performance and lightweight requirements of a rear subframe of an automobile cannot be well taken into account, a rear subframe and an automobile are provided.

[0005] To solve the above technical problems, on the one hand, an embodiment of the present invention provides a rear subframe, comprising a front crossbeam, a rear crossbeam, a left longitudinal beam, a right longitudinal beam, a left toe bracket, a right toe bracket, a left lower swing arm bracket, a right lower swing arm bracket, a left connecting bracket, and a right connecting bracket; the left end of the rear crossbeam is connected to the rear end of the left longitudinal beam, and the right end of the rear crossbeam is connected to the rear end of the right longitudinal beam; the front end of the left longitudinal beam is connected to the left end of the front crossbeam, and the front end of the right longitudinal beam is connected to the right end of the front crossbeam;

[0006] The left toe-in bracket is connected to the lower left end of the front cross member and the lower front end of the left longitudinal member; the right toe-in bracket is connected to the lower right end of the front cross member and the lower front end of the right longitudinal member; the left lower arm bracket is connected to the lower left end of the rear cross member and the lower rear end of the left longitudinal member, and the right lower arm bracket is connected to the lower right end of the rear cross member and the lower rear end of the right longitudinal member;

[0007] The left connecting bracket is connected between the left toe-in bracket and the left lower swing arm bracket; the right connecting bracket is connected between the right toe-in bracket and the right lower swing arm bracket.

[0008] Optionally, the left toe-in bracket includes a left toe-in front plate and a left toe-in rear plate connected to the left toe-in front plate, the front end of the left connecting bracket and the left end of the front cross beam are both connected to the left toe-in front plate, and the front end of the left connecting bracket, the left end of the front cross beam and the front end of the left longitudinal beam are all connected to the left toe-in rear plate;

[0009] The right toe-in bracket includes a right toe-in front plate and a right toe-in rear plate connected to the right toe-in front plate, the front end of the right connecting bracket is connected to the right toe-in front plate and the right toe-in rear plate, the front end of the right connecting bracket and the right end of the front cross beam are both connected to the right toe-in front plate, and the front end of the right connecting bracket, the right end of the front cross beam and the front end of the right longitudinal beam are all connected to the right toe-in rear plate.

[0010] Optionally, the left lower swing arm bracket includes a left lower swing arm front plate and a left lower swing arm rear plate connected to the left lower swing arm front plate, the rear end of the left connecting bracket and the left end of the rear cross beam are connected to the left lower swing arm front plate, and the left longitudinal beam is connected to the left lower swing arm rear plate;

[0011] The right lower swing arm bracket includes a right lower swing arm front plate and a right lower swing arm rear plate connected to the right lower swing arm front plate, the rear end of the right connecting bracket and the right end of the rear cross beam are connected to the right lower swing arm front plate, and the right longitudinal beam is connected to the right lower swing arm rear plate.

[0012] Optionally, the front end of the left lower swing arm front plate is provided with a first flange for connecting to the rear end of the left connecting bracket, and the front end of the right lower swing arm front plate is provided with a second flange for connecting to the rear end of the left connecting bracket.

[0013] Optionally, the rear end of the left connecting bracket is welded to the first flange; the rear end of the right connecting bracket is welded to the second flange.

[0014] Optionally, the front cross beam, the left longitudinal beam and the right longitudinal beam are all tubular beam structures, and the rear cross beam is a stamped part.

[0015] Optionally, the middle cross-sections of the front cross-beam, the left longitudinal beam and the right longitudinal beam are circular; the rear end of the left longitudinal beam, the rear end of the right longitudinal beam and the left and right ends of the front cross-beam are flat in cross-section.

[0016] Optionally, the rear end of the left longitudinal beam, the rear end of the right longitudinal beam, and the left and right ends of the front cross beam are all provided with mounting holes; the rear end of the left longitudinal beam, the rear end of the right longitudinal beam, and the left and right ends of the front cross beam are all connected to the vehicle body via mounting sleeves or bushings passing through the mounting holes.

[0017] Optionally, the cross-sections of the left connecting bracket and the right connecting bracket are C-shaped.

[0018] According to the rear subframe of the embodiment of the invention, the left end of the rear cross beam is connected to the rear end of the left longitudinal beam, and the right end of the rear cross beam is connected to the rear end of the right longitudinal beam; the front end of the left longitudinal beam is connected to the left end of the front cross beam, and the front end of the right longitudinal beam is connected to the right end of the front cross beam; the left front toe bracket is connected to the lower left end of the front cross beam and the lower front end of the left longitudinal beam; the right front toe bracket is connected to the lower right end of the front cross beam and the lower front end of the right longitudinal beam; the left lower control arm bracket is connected to the lower left end of the rear cross beam and the lower rear end of the left longitudinal beam, and the right lower control arm bracket is connected to the lower right end of the rear cross beam and the lower rear end of the right longitudinal beam; in this way, the connection between the front cross beam, the rear cross beam, the left longitudinal beam, the right longitudinal beam, the left front toe bracket, the right front toe bracket, the left lower control arm bracket and the right lower control arm bracket is firm, which can meet the requirements of vehicle durability, comfort, vehicle strength and stiffness characteristics, and improve the performance of the rear subframe.

[0019] At the same time, the left connecting bracket is connected between the left toe bracket and the left lower arm bracket; the right connecting bracket is connected between the right toe bracket and the right lower arm bracket. In this way, the rear subframe of the present invention forms a two-end support structure with the toe bracket (including the left toe bracket and the right toe bracket) and the lower arm bracket (including the left lower arm bracket and the right lower arm bracket) through the connecting bracket. In this way, the Y-direction span of the connecting bracket significantly improves the first-order torsional mode and the first-order bending mode of the rear subframe (the structural mode is improved by about 60HZ) and the dynamic stiffness value of the mounting point of the toe bracket and the lower arm bracket (the stiffness is improved by about 200%), and further improves the NVH performance; at the same time, it also significantly improves the supporting capacity, strength and fatigue life of the rear subframe, making the platform derivative capability of the rear subframe stronger, and can also reduce the thickness of the toe bracket and the lower arm bracket while ensuring the requirements of the vehicle's overall durability, comfort, overall strength and stiffness characteristics, thereby achieving the goal of lightweighting, reducing production costs and improving production efficiency. At the same time, the present invention has a simple structure, a simple manufacturing process, high production efficiency, less investment in molds and development costs, and a short development cycle.

[0020] On the other hand, an embodiment of the present invention further provides an automobile, which includes the above-mentioned rear subframe. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a front view of a rear subframe provided by one embodiment of the present invention.

[0022] Figure 2 It is a left side view of a rear subframe provided by one embodiment of the present invention.

[0023] The reference numerals in the specification are as follows:

[0024] 1. Front cross member; 2. Rear cross member; 3. Left longitudinal member; 4. Right longitudinal member; 5. Left toe bracket; 51. Left toe front plate; 52. Left toe rear plate; 6. Right toe bracket; 61. Right toe front plate; 62. Right toe rear plate; 7. Left lower control arm bracket; 71. Left lower control arm front plate; 72. Left lower control arm rear plate; 8. Right lower control arm bracket; 81. Right lower control arm front plate; 82. Right lower control arm rear plate; 83. Second flange; 9. Left connecting bracket; 10. Right connecting bracket; 11. Install the sleeve. DETAILED DESCRIPTION

[0025] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0026] It should be understood that the terms "upper", "lower", "front", "back", "left", "right", "middle", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0027] like Figure 1 and Figure 2 As shown, Figure 1 This is a front view of a rear subframe provided by one embodiment of the present invention; Figure 2 This is a left side view of the rear subframe provided by one embodiment of the present invention. Figure 1 The structure of the rear subframe, Figure 1 The rear subframe shown in FIG is reversed from the position where it is installed on the vehicle. In this case, the "left" in the present invention is Figure 1 The right side of the rear subframe shown (e.g., the left end of the rear cross member 2, the left end of the front cross member 1, etc.), “right” means Figure 1 The left side of the rear subframe shown (such as the right end of the front crossbeam 1, the right end of the rear crossbeam 2, etc.); "front" means Figure 1The upper part of the rear subframe shown (for example: the front cross member 1, the left toe bracket 5, the right toe bracket 6, the front end of the left longitudinal beam 3, the front end of the right longitudinal beam 4, the lower part of the front end of the left longitudinal beam 3, the lower part of the front end of the right longitudinal beam 4, etc.), "rear" is Figure 1 The lower part of the rear subframe shown (e.g. rear cross member 2); "upper" means Figure 2 The left side of the rear subframe, "down" is Figure 2 The right side of the rear subframe (for example: the left lower control arm bracket 7, the right lower control arm bracket 8, the left end lower part of the front cross beam 1, the front end lower part of the left longitudinal beam 3, the right end lower part of the front cross beam 1, the front end lower part of the right longitudinal beam 4, etc.).

[0028] like Figure 1 and Figure 2 As shown, one embodiment of the present invention provides a rear subframe, comprising a front crossbeam 1, a rear crossbeam 2, a left longitudinal beam 3, a right longitudinal beam 4, a left toe bracket 5, a right toe bracket 6, a left lower control arm bracket 7, a right lower control arm bracket 8, a left connecting bracket 9, and a right connecting bracket 10. The left end of the rear crossbeam 2 is connected to the rear end of the left longitudinal beam 3, and the right end of the rear crossbeam 2 is connected to the rear end of the right longitudinal beam 4. The front end of the left longitudinal beam 3 is connected to the left end of the front crossbeam 1, and the front end of the right longitudinal beam 4 is connected to the right end of the front crossbeam 1. Preferably, the left longitudinal beam 3 and the right longitudinal beam 4 are symmetrically arranged. Furthermore, the connection method between the front crossbeam 1, the rear crossbeam 2, the left longitudinal beam 3, and the right longitudinal beam 4 includes, but is not limited to, welding.

[0029] The left toe bracket 5 connects the lower left end of the front cross member 1 and the lower front end of the left longitudinal member 3; the right toe bracket 6 connects the lower right end of the front cross member 1 and the lower front end of the right longitudinal member 4. This ensures a more stable connection (preferably welded) between the front cross member 1 and the left and right longitudinal members 3 and 4, improving the performance of the rear subframe. Preferably, both the left and right toe brackets 5 and 6 are stamped structural components to meet strength and rigidity requirements.

[0030] The left lower arm bracket 7 is connected to the lower left end of the rear cross member 2 and the lower rear end of the left longitudinal member 3, while the right lower arm bracket 8 is connected to the lower right end of the rear cross member 2 and the lower rear end of the right longitudinal member 4. This ensures a more stable connection (preferably welded) between the left lower arm bracket 7 and the right lower arm bracket 8 and the rear cross member 2, the left longitudinal member 3, and the right longitudinal member 4, thereby improving the performance of the rear subframe. Preferably, the left lower arm bracket 7 and the right lower arm bracket 8 are stamped from steel plates to meet their strength and rigidity requirements.

[0031] The left connecting bracket 9 is connected (preferably welded) between the left front toe bracket 5 and the left lower arm bracket 7; the right connecting bracket 10 is connected (preferably welded) between the right front toe bracket 6 and the right lower arm bracket 8. Figure 1 and Figure 2 As shown, the front end of the left connecting bracket 9 is connected to the lower part of the left front toe bracket 5, and the rear end of the left connecting bracket 9 is connected to the front end of the left lower swing arm bracket 7; the front end of the right connecting bracket 10 is connected to the lower part of the right front toe bracket 6; the rear end of the right connecting bracket 10 is connected to the front end of the right lower swing arm bracket 8; However, in the present invention, the connection method of the left connecting bracket 9 and the right connecting bracket 10 is not limited to Figure 1 and Figure 2 As shown in , for example, the front end of the left connecting bracket 9 (the same applies to the right connecting bracket 10) can be connected to the side wall of the left toe-in bracket 5, as long as the performance and lightweight requirements are met. Preferably, the cross-sections of the left connecting bracket 9 and the right connecting bracket 10 are C-shaped, and the left connecting bracket 9 and the right connecting bracket 10 are stamped from steel plates to meet their strength and rigidity requirements. It can be understood that the left connecting bracket 9 and the right connecting bracket 10 stamped with a C-shaped cross-section can better meet the lightweight requirements compared to the tubular beam structure, and the installation process is simpler than that of the tubular beam structure.

[0032] The rear subframe of the embodiment of the invention features a secure connection between the front cross member 1, rear cross member 2, left longitudinal member 3, right longitudinal member 4, left toe bracket 5, right toe bracket 6, left lower control arm bracket 7, and right lower control arm bracket 8, meeting the vehicle's overall durability, comfort, strength, and rigidity requirements, thereby improving rear subframe performance. Furthermore, the front end of the left connecting bracket 9 connects to the lower portion of the left toe bracket 5, while the rear end of the left connecting bracket 9 connects to the front end of the left lower control arm bracket 7. The front end of the right connecting bracket 10 connects to the lower portion of the right toe bracket 6, while the rear end of the right connecting bracket 10 connects to the front end of the right lower control arm bracket 8. In this way, the rear subframe of the present invention forms a two-end support structure by connecting the bracket so that the toe bracket (including the left toe bracket 5 and the right toe bracket 6) and the lower arm bracket (including the left lower arm bracket 7 and the right lower arm bracket 8). In this way, the Y-direction span of the connecting bracket significantly improves the first-order torsional mode and the first-order bending mode of the rear subframe (the structural mode is improved by about 60HZ) and the dynamic stiffness value of the installation point of the toe bracket and the lower arm bracket (the stiffness is improved by about 200%), and further improves the NVH performance; at the same time, it also significantly improves the supporting capacity, strength and fatigue life of the rear subframe, making the platform derivative capability of the rear subframe stronger, and can also reduce the thickness of the toe bracket and the lower arm bracket while ensuring the requirements of the vehicle durability, comfort, vehicle strength and stiffness characteristics of the vehicle, thereby achieving the goal of lightweighting, reducing production costs and improving production efficiency. At the same time, the present invention has a simple structure, a simple manufacturing process, high production efficiency, less investment in molds and development costs, and a short development cycle.

[0033] In one embodiment, if Figure 1 and Figure 2 As shown, the left toe-in bracket 5 includes a left toe-in front plate 51 and a left toe-in rear plate 52 connected to the left toe-in front plate 51, the front end of the left connecting bracket 9 and the left end of the front cross beam 1 are both connected to the left toe-in front plate 51, the front end of the left connecting bracket 9, the left end of the front cross beam 1 and the front end of the left longitudinal beam 3 are all connected to the left toe-in rear plate 52; the right toe-in bracket 6 includes a right toe-in front plate 61 and a right toe-in rear plate 62 connected to the right toe-in front plate 61, the front end of the right connecting bracket 10 is connected to the right toe-in front plate 61 and the right toe-in rear plate 62, the front end of the right connecting bracket 10 and the right end of the front cross beam 1 are both connected to the right toe-in front plate 61, the front end of the right connecting bracket 10, the right end of the front cross beam 1 and the front end of the right longitudinal beam 4 are all connected to the right toe-in rear plate 62.

[0034] Understandably, since the left toe bracket 5 and the right toe bracket 6 are installation points, the dynamic stiffness and fatigue strength requirements thereat are very high. If the left toe bracket 5 and the right toe bracket 6 are only stamped as one piece, then the stamped left toe bracket 5 and the right toe bracket 6 cannot form a closed cross-section (at most only a C-shaped cross-section can be formed). At this time, the cross-sectional strength of the left toe bracket 5 and the right toe bracket 6 cannot be guaranteed; in the present embodiment, the left toe front plate 51, the left toe rear plate 52, the right toe front plate 61 and the right toe rear plate 62 are all piece-type stamped parts, and the piece-type stamping process is simpler than the one-piece forming process, and the left toe front plate 51 and the left toe rear plate 52 are welded to form the left toe bracket 5, and the right toe front plate 61 and the right toe rear plate 62 are welded to form the right toe bracket 6; in this way, the left toe bracket 5 and the right toe bracket 6 can be formed into a closed cross-section to ensure the cross-sectional strength while making the stamping process simpler. It can be understood that in the present invention, the connection method between the left toe bracket 5 (including the left toe front plate 51 and the left toe rear plate 52) and the right toe bracket 6 (including the right toe front plate 61 and the right toe rear plate 62) and the front cross beam 1, the left longitudinal beam 3 and the right longitudinal beam 4 can be changed according to needs, as long as a closed structure can be formed between the left toe bracket 5 and the left longitudinal beam 3 and the front cross beam 1, and between the right toe bracket 6 and the right longitudinal beam 4 and the front cross beam 1 (in this case, the left toe bracket 5 and the right toe bracket 6 both form a closed cross section) to enhance the stiffness and load-bearing capacity of the left toe bracket 5 and the right toe bracket 6.

[0035] In one embodiment, if Figure 1 and Figure 2 As shown, the left lower swing arm bracket 7 includes a left lower swing arm front plate 71 and a left lower swing arm rear plate 72 connected to the left lower swing arm front plate 71, the rear end of the left connecting bracket 9 and the left end of the rear cross beam 2 are connected to the left lower swing arm front plate 71, and the left longitudinal beam 3 is connected to the left lower swing arm rear plate 72; the right lower swing arm bracket 8 includes a right lower swing arm front plate 81 and a right lower swing arm rear plate 82 connected to the right lower swing arm front plate 81, the rear end of the right connecting bracket 10 and the right end of the rear cross beam 2 are connected to the right lower swing arm front plate 81, and the right longitudinal beam 4 is connected to the right lower swing arm rear plate 82.

[0036] Understandably, since the left lower arm bracket 7 and the right lower arm bracket 8 are installation points, the dynamic stiffness and fatigue strength requirements at this point are very high. If the left lower arm bracket 7 and the right lower arm bracket 8 are only stamped as a whole, then the stamped left lower arm bracket 7 and the right lower arm bracket 8 cannot form a closed cross-section (at most, only a C-shaped cross-section can be formed). At this time, the cross-sectional strength of the left lower arm bracket 7 and the right lower arm bracket 8 cannot be guaranteed. In this embodiment, the left lower arm front plate 71 and the left lower arm rear plate 72. The right lower arm front plate 81 and the right lower arm rear plate 82 are both split-piece stamping parts. The split-piece stamping process is simpler than the one-piece stamping process. The left lower arm front plate 71 and the left lower arm rear plate 72 are welded to form the left lower arm bracket 7, and the right lower arm front plate 81 and the right lower arm rear plate 82 are welded to form the right lower arm bracket 8. In this way, the left lower arm bracket 7 and the right lower arm bracket 8 can be made simpler in the stamping process while ensuring the formation of a closed cross-section to ensure the cross-sectional strength. It can be understood that in the present invention, the connection method between the left lower swing arm bracket 7 (including the left lower swing arm front plate 71 and the left lower swing arm rear plate 72) and the right lower swing arm bracket 8 (including the right lower swing arm front plate 81 and the right lower swing arm rear plate 82) and the rear cross beam 2, the left longitudinal beam 3 and the right longitudinal beam 4 can be changed according to needs. For example, in the present invention, if the installation boundary conditions, the corresponding installation position and weight requirements indicate that there is no need to connect the left lower swing arm bracket 7 with the left longitudinal beam 3, the right lower swing arm bracket 8 and the right longitudinal beam 4, the left lower swing arm bracket 7 and the right lower swing arm bracket 8 may not be connected with the left longitudinal beam 3 and / or the right longitudinal beam 4.

[0037] In one embodiment, if Figure 1 and Figure 2 As shown, the front end of the left lower arm front plate 71 is provided with a first flange (not shown) for connecting to the rear end of the left connecting bracket 9, and the front end of the right lower arm front plate 81 is provided with a second flange 83 for connecting to the rear end of the left connecting bracket 9. The shapes of the first flange and the second flange 83 can be set according to requirements. Preferably, the rear end of the left connecting bracket 9 is welded to the first flange; the rear end of the right connecting bracket 10 is welded to the second flange 83. It is understandable that Figure 2 As shown, the second flange 83 (the first flange is the same) is covered on the outer periphery of the rear end of the right connecting bracket 10, and finally the outer periphery of the rear end of the right connecting bracket 10 is welded to the inner side wall of the second flange 83, so that the welding area of the two is larger and the connection is more stable.

[0038] In one embodiment, if Figure 1 and Figure 2As shown, the front crossbeam 1, the left longitudinal beam 3, and the right longitudinal beam 4 are all tubular beam structures, while the rear crossbeam 2 is a stamped part. That is, the front crossbeam 1, the left longitudinal beam 3, and the right longitudinal beam 4 are tubular beam structures formed by bending steel pipes. This simplifies the forming process and facilitates machining. The rear subframe is connected to the vehicle body via the front crossbeam 1, the left longitudinal beam 3, and the right longitudinal beam 4. Therefore, the diameters of the front crossbeam 1, the left longitudinal beam 3, and the right longitudinal beam 4 can be planned in the early stages of the rear subframe design, ensuring that the planned diameters meet design requirements. For example, the diameters of the tubular beams of the front crossbeam 1, left longitudinal beam 3, and right longitudinal beam 4 of the designed rear subframe meet the following design requirements: the designed rear subframe must simultaneously meet the installation requirements of a rigid connection to the vehicle body via a mounting sleeve 11 and a flexible connection via a bushing. This allows the rear subframe to be used in vehicles with different performance requirements by simply switching the connection method between the rear subframe and the vehicle body (via a mounting sleeve 11 or a bushing connection), without requiring a new rear subframe development. This makes platform-based derivation of the rear subframe easier and increases its universalization rate. Furthermore, the left and right lower control arm brackets 7 and 8 are both mounted on the rear crossbeam 2, which is subject to greater support forces. Therefore, the rear crossbeam 2 is designed as a stamped part, which can provide sufficient support while also meeting lightweight requirements (compared to a tubular beam structure, it can be lighter with the same load-bearing capacity).

[0039] In one embodiment, if Figure 1 and Figure 2 As shown, the front cross-member 1, the left longitudinal member 3, and the right longitudinal member 4 have circular cross-sections in the middle; the rear end of the left longitudinal member 3, the rear end of the right longitudinal member 4, and the left and right ends of the front cross-member 1 have flat cross-sections. That is, in this embodiment, the middle section of the tubular beam structure comprising the front cross-member 1, the left longitudinal member 3, and the right longitudinal member 4 is a circular tube with a circular cross-section (i.e., the middle cross-section). Furthermore, in this embodiment, the rear subframe is mounted on the vehicle body via the rear end of the left longitudinal member 3, the rear end of the right longitudinal member 4, and the left and right ends of the front cross-member 1. Therefore, the cross-sections at the rear end of the left longitudinal member 3, the rear end of the right longitudinal member 4, and the left and right ends of the front cross-member 1 are designed to be flat to meet installation requirements.

[0040] In one embodiment, if Figure 1 and Figure 2 As shown, the rear end of the left longitudinal beam 3, the rear end of the right longitudinal beam 4, and the left and right ends of the front cross beam 1 are all provided with mounting holes (not shown); the rear end of the left longitudinal beam 3, the rear end of the right longitudinal beam 4, and the left and right ends of the front cross beam 1 are all connected to the vehicle body through mounting sleeves 11 or bushings passing through the mounting holes.

[0041] That is, in this embodiment, the rear subframe is installed on the vehicle body using a mounting sleeve 11 (the mounting sleeve 11 is a hollow cylindrical structure, the mounting sleeve 11 is welded to the top or inner wall of the mounting hole, and the bolt passes through the interior of the mounting sleeve 11 to connect with the vehicle body) or a bushing (the outer ring of the bushing is welded to the top or inner wall of the mounting hole) through the mounting holes designed at the rear end of the left longitudinal beam 3, the rear end of the right longitudinal beam 4, and the left and right ends of the front cross beam 1.

[0042] Understandably, in the present invention, in the early stage of designing the rear subframe, the diameters of the front crossbeam 1, the left longitudinal beam 3 and the right longitudinal beam 4 can be planned to meet the design requirements: the designed rear subframe must simultaneously meet the requirements of rigid connection with the vehicle body through the mounting sleeve 11 and soft connection through the bushing; at this time, if it is necessary to make the vehicle model with the rear subframe meet the comfort requirements, the rear subframe is installed on the vehicle body through the bushing (soft connection) to improve the comfort; if it is necessary to make the vehicle model with the rear subframe meet the handling stability requirements, the rear subframe is installed on the vehicle body through the mounting sleeve 11 (i.e., rigid connection, hard connection). In this way, when switching between two car models corresponding to different performances (comfort or handling stability), it is only necessary to switch the mounting sleeves 11 and bushings at the car body mounting points (i.e., the rear end of the left longitudinal beam 3, the rear end of the right longitudinal beam 4, and the points with mounting holes at the left and right ends of the front crossbeam 1 in the present invention) (other parts do not need to be replaced at this time), without the need to redevelop different rear subframe molds. This makes it easy to derive platform products, and the rear subframe parts have a high commonality rate, thus shortening the development cycle, reducing mold investment, and saving costs. At the same time, after being able to meet the two connection methods of rigid connection with the car body through the mounting sleeves 11 and soft connection through the bushings, the lateral span between the rear subframe and the car body mounting points can be designed to be a fixed value, making the interface between the rear subframe and the car body platform-based, which is conducive to the platform-based derivation of the car body and the rear subframe, facilitating the development of new products, further improving product development efficiency, shortening the development cycle, and reducing product development investment.

[0043] Specifically, to ensure that the mounting sleeve 11 and the bushing are compatible with the application switching of different vehicle models, the corresponding pipe beam diameters of the front cross member 1, the left longitudinal beam 3, and the right longitudinal beam 4 can be first set. In this case, the flattened cross-sectional perimeters of the rear end of the left longitudinal beam 3, the rear end of the right longitudinal beam 4, and the left and right ends of the front cross member 1 are equal to the cross-sectional perimeters of the middle portions of the front cross member 1, the left longitudinal beam 3, and the right longitudinal beam 4, and can all be calculated based on the aforementioned pipe beam diameters. In addition, the cross-sectional heights of the pipe beams at the rear end of the left longitudinal beam 3, the rear end of the right longitudinal beam 4, and the left and right ends of the front cross member 1 must not only meet the installation height requirements for the mounting sleeve 11 and the bushing, but must also meet the requirement that the spacing between the ends of the mounting sleeve 11 and the upper and lower surfaces of the pipe beam is greater than or equal to 5 mm to meet the weld height requirements. In addition, the width of the tubular beam at the rear end of the left longitudinal beam 3, the rear end of the right longitudinal beam 4, and the left and right ends of the front cross beam 1 must also meet the arrangement requirements of the bushing, so that the bushing has a welding length of at least 1 / 2 of the circumference at the welding position with the rear end of the left longitudinal beam 3, the rear end of the right longitudinal beam 4, and the left and right ends of the front cross beam 1, so that the welding is firm.

[0044] On the other hand, an embodiment of the present invention further provides an automobile, which includes the above-mentioned rear subframe.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A rear subframe, characterized in that: It includes a front crossbeam, a rear crossbeam, a left longitudinal beam, a right longitudinal beam, a left toe bracket, a right toe bracket, a left lower swing arm bracket, a right lower swing arm bracket, a left connecting bracket and a right connecting bracket; the left end of the rear crossbeam is connected to the rear end of the left longitudinal beam, and the right end of the rear crossbeam is connected to the rear end of the right longitudinal beam; the front end of the left longitudinal beam is connected to the left end of the front crossbeam, and the front end of the right longitudinal beam is connected to the right end of the front crossbeam; The left toe-in bracket is connected to the lower left end of the front cross member and the lower front end of the left longitudinal member; the right toe-in bracket is connected to the lower right end of the front cross member and the lower front end of the right longitudinal member; the left lower arm bracket is connected to the lower left end of the rear cross member and the lower rear end of the left longitudinal member, and the right lower arm bracket is connected to the lower right end of the rear cross member and the lower rear end of the right longitudinal member; The left connecting bracket is connected between the left toe bracket and the left lower swing arm bracket; the right connecting bracket is connected between the right toe bracket and the right lower swing arm bracket; the front end of the left connecting bracket is connected to the lower part of the left toe bracket, and the rear end of the left connecting bracket is connected to the front end of the left lower swing arm bracket; the front end of the right connecting bracket is connected to the lower part of the right toe bracket; and the rear end of the right connecting bracket is connected to the front end of the right lower swing arm bracket.

2. The rear subframe according to claim 1, characterized in that: The left toe-in bracket includes a left toe-in front plate and a left toe-in rear plate connected to the left toe-in front plate, the front end of the left connecting bracket and the left end of the front crossbeam are both connected to the left toe-in front plate, and the front end of the left connecting bracket, the left end of the front crossbeam and the front end of the left longitudinal beam are all connected to the left toe-in rear plate; The right toe-in bracket includes a right toe-in front plate and a right toe-in rear plate connected to the right toe-in front plate, the front end of the right connecting bracket is connected to the right toe-in front plate and the right toe-in rear plate, the front end of the right connecting bracket and the right end of the front cross beam are both connected to the right toe-in front plate, and the front end of the right connecting bracket, the right end of the front cross beam and the front end of the right longitudinal beam are all connected to the right toe-in rear plate.

3. The rear subframe according to claim 1, characterized in that: The left lower swing arm bracket includes a left lower swing arm front plate and a left lower swing arm rear plate connected to the left lower swing arm front plate, the rear end of the left connecting bracket and the left end of the rear crossbeam are connected to the left lower swing arm front plate, and the left longitudinal beam is connected to the left lower swing arm rear plate; The right lower swing arm bracket includes a right lower swing arm front plate and a right lower swing arm rear plate connected to the right lower swing arm front plate, the rear end of the right connecting bracket and the right end of the rear cross beam are connected to the right lower swing arm front plate, and the right longitudinal beam is connected to the right lower swing arm rear plate.

4. The rear subframe according to claim 3, characterized in that: The front end of the left lower swing arm front plate is provided with a first flange for connecting to the rear end of the left connecting bracket, and the front end of the right lower swing arm front plate is provided with a second flange for connecting to the rear end of the left connecting bracket.

5. The rear subframe according to claim 4, characterized in that: The rear end of the left connecting bracket is welded to the first flange; the rear end of the right connecting bracket is welded to the second flange.

6. The rear subframe according to claim 1, characterized in that: The front cross beam, the left longitudinal beam and the right longitudinal beam are all tubular beam structures, and the rear cross beam is a stamped part.

7. The rear subframe according to claim 6, characterized in that: The middle sections of the front cross beam, the left longitudinal beam and the right longitudinal beam are circular; the rear end of the left longitudinal beam, the rear end of the right longitudinal beam and the left and right ends of the front cross beam are flat in cross section.

8. The rear subframe according to any one of claims 1 to 7, characterized in that: The rear end of the left longitudinal beam, the rear end of the right longitudinal beam, and the left and right ends of the front cross beam are all provided with mounting holes; the rear end of the left longitudinal beam, the rear end of the right longitudinal beam, and the left and right ends of the front cross beam are all connected to the vehicle body via mounting sleeves or bushings passing through the mounting holes.

9. The rear subframe according to claim 1, characterized in that: The cross-sections of the left connecting bracket and the right connecting bracket are C-shaped.

10. An automobile, characterized in that: The vehicle comprises the rear subframe according to any one of claims 1 to 9.

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