CN112141213A - Rear auxiliary frame and automobile - Google Patents

Abstract

The invention belongs to the technical field of automobile chassis, and particularly relates to a rear auxiliary frame and an automobile. The left front beam bracket of the rear auxiliary frame is connected with the lower part of the left end of the front cross beam and the lower part of the front end of the left longitudinal beam; the right front beam support is connected with the lower part of the right end of the front cross beam and the lower part of the front end of the right longitudinal beam; the left lower swing arm support is connected with the lower part of the left end of the rear cross beam and the lower part of the rear end of the left longitudinal beam, and the right lower swing arm support is connected with the lower part of the right end of the rear cross beam and the lower part of the rear end of the right longitudinal beam; 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. The invention improves the structural mode and performance of the rear auxiliary frame while meeting the requirements of the durability and comfort of the whole automobile, realizes the aim of light weight, reduces the production cost and improves the production efficiency.

Description

Rear subframe and car

technical field

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

Background technique

The rear subframe of the car is a very important component in the chassis system of the car. The rear subframe connects the body and the suspension and other parts, which can reduce the transmission of vibration and noise from the road to the body. At the same time, the rear subframe can also improve the The stiffness of the suspension, so that the vehicle has better durability and comfort.

Since the toe-in bracket and the swing arm bracket have a great influence on the NVH (Noise, Vibration and Harshness: Noise, Vibration, Harshness) performance and life of the vehicle, the toe-in bracket and the swing arm bracket are the vehicle chassis system. Therefore, when designing the rear subframe, there are relatively high design requirements for the structural mode of the rear subframe, as well as the dynamic stiffness and fatigue strength of the toe-in bracket and the lower swing arm bracket. In the existing rear subframe, the toe-in bracket and the swing arm bracket are usually cantilever structures, and the toe-in bracket and the swing arm bracket of the cantilever structure cannot well take into account the performance and lightweight requirements of the rear subframe. Specifically, the modalities of the existing rear subframe, the dynamic stiffness and fatigue strength of the mounting points of the toe-in bracket and the lower swing arm bracket are improved, mainly by increasing the cross-section of the front and rear cross-members of the rear subframe, as well as the toe-in bracket and the lower swing arm bracket. The thickness of the arm bracket is used to achieve this, which will lead to an increase in the weight of the rear subframe and complex cross-sectional characteristics, which is not conducive to meeting the lightweight requirements, and will also lead to an increase in production costs and a reduction in production efficiency. The improvement of the structural mode of the subframe, stiffness, NVH and other properties is not ideal (the stiffness is increased by about 50%, and the structural mode is increased by about 30HZ).

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a rear subframe and an automobile in view of the problem in the prior art that the performance and light weight requirements of the rear subframe of an automobile cannot be well balanced.

In order to solve the above technical problems, on the one hand, an embodiment of the present invention provides a rear subframe, which includes a front beam, a rear beam, a left longitudinal beam, a right longitudinal beam, a left toe-in bracket, a right toe-in bracket, a left lower swing arm bracket, a right a lower swing arm bracket, a left connecting bracket and a right connecting bracket; 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 is connected to the left end of the front cross member, and the front end of the right longitudinal beam is connected to the right end of the front cross member;

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 beam; 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 beam; the left hem The 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 swing arm bracket is connected to the lower right end of the rear cross beam and the lower rear end of the right longitudinal beam;

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

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, and the front end of the left connecting bracket and the left end of the front beam are both connected to the left toe-in front plate. , the front end of the left connecting bracket, the left end of the front cross member 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, and the right connection bracket is connected to the right toe-in front plate and the right toe-in rear plate. The front end of the bracket and the right end of the front cross member are connected to the right toe-in front plate, and the front end of the right connecting bracket, the right end of the front cross member and the front end of the right longitudinal beam are all connected to the right toe-in rear plate.

Optionally, the left lower arm bracket includes a left lower arm front plate and a left lower arm rear plate connected to the left lower arm front plate, and the rear end of the left connection bracket and the left end of the rear beam are connected to the the left lower swing arm front plate, 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, and the rear end of the right connecting bracket and the right end of the rear 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.

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 rear end for connecting to the left connecting bracket. the second flange at the end.

Optionally, the rear end of the left connecting bracket is welded on the first flange; the rear end of the right connecting bracket is welded on the second flange.

Optionally, the front transverse beam, the left longitudinal beam and the right longitudinal beam are all tubular beam structures, and the rear transverse beam is a stamped and formed part.

Optionally, the cross-section of the middle of the front cross member, the left side member and the right side member is circular; the rear end of the left side member, the rear end of the right side member and the front cross member are The cross-sections of the left and right ends are flat.

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 right longitudinal beam The rear end of the front cross member and the left and right ends of the front cross member are connected to the vehicle body through mounting sleeves or bushings passing through the mounting holes.

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

According to the rear subframe of the embodiment of the invention, the left end of the rear cross member is connected to the rear end of the left side member, the right end of the rear cross member is connected to the rear end of the right side member; the front end of the left side member is connected to the left end of the front cross member, and the The front end is connected to the right end of the front beam; the left toe-in bracket is connected to the lower part of the left end of the front beam and the lower part of the front end of the left longitudinal beam; the right toe-in bracket is connected to the lower part of the right end of the front beam and the lower part of the front end of the right longitudinal beam; The lower part of the left end and the lower part of the rear end of the left longitudinal beam, the right lower swing arm bracket is connected to the lower part of the right end of the rear beam and the lower part of the rear end of the right longitudinal beam; The connection between the right toe-in bracket, the left lower swing arm bracket and the right lower swing arm bracket is stable, which can meet the requirements of vehicle durability, comfort, vehicle strength and rigidity characteristics, and improve the performance of the rear subframe.

Meanwhile, the left connecting bracket is connected between the left toe-in bracket and the left lower swing arm bracket; the right connection bracket is connected between the right toe-in bracket and the right lower swing arm bracket. In this way, the rear sub-frame in the present invention makes the toe-in bracket (including the left toe-in bracket and the right toe-in bracket) and the lower swing arm bracket (including the left toe-in bracket and the right lower swing arm bracket) form a support structure at both ends by connecting the brackets, so , connecting the Y-direction span of the bracket, which significantly improves the first-order torsional mode and first-order bending mode of the rear subframe (the structural mode is increased by about 60HZ) and the dynamic stiffness value of the installation point of the toe-in bracket and the lower swing arm bracket (The stiffness is increased by about 200%), which further improves the NVH performance; at the same time, it also significantly improves the support capacity, strength and fatigue life of the rear sub-frame, making the platform-based derivative ability of the rear sub-frame stronger, and it can also be guaranteed. In addition to the requirements of vehicle durability, comfort, vehicle strength and stiffness characteristics, the thickness of the toe-in bracket and the lower swing arm bracket is reduced to achieve the goal of light weight, reduce production costs, and improve production efficiency. At the same time, the invention has simple structure, simple manufacturing process, high production efficiency, less investment in molds and development costs, and short development cycle.

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

Description of drawings

FIG. 1 is a front view of a rear sub-frame provided by an embodiment of the present invention.

FIG. 2 is a left side view of a rear subframe provided by an embodiment of the present invention.

The reference numbers in the description are as follows:

1. Front beam; 2. Rear beam; 3. Left longitudinal beam; 4. Right longitudinal beam; 5. Left toe-in bracket; 51. Left toe-in front plate; 52. Left toe-in rear plate; 6. Right toe-in bracket; 61. Right toe-in front plate; 62. Right toe-in rear plate; 7. Left lower-swing arm bracket; 71. Left lower-swing arm front plate; 72. Left lower-swing arm rear plate; 8. Right lower-swing arm bracket; 81. Right lower-swing arm front plate; 82. Right lower swing arm rear plate; 83. Second flange; 9. Left connecting bracket; 10. Right connecting bracket; 11. Installation sleeve.

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer, the present invention will be 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, but not to limit the present invention.

It should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "middle", etc. is based on the orientation or position shown in the drawings The relationship is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

As shown in Figures 1 and 2, Figure 1 is a front view of a rear subframe provided by an embodiment of the present invention; Figure 2 is a left side view of a rear subframe provided by an embodiment of the present invention. In the present invention, in order to better show the structure of the rear sub-frame in FIG. 1 , the rear sub-frame shown in FIG. 1 and the position where it is installed on the vehicle are turned over and placed. "Left" is the right side of the rear subframe shown in Figure 1 (for example: the left end of the rear cross member 2, the left end of the front cross member 1, etc.), and "right" is the left side of the rear subframe shown in Figure 1 (such as the right end of the front beam 1, the right end of the rear beam 2, etc.); "front" is the upper part of the rear subframe shown in Figure 1 (for example: front beam 1, left toe-in bracket 5, right toe-in bracket 6, left The front end of the side member 3, the front end of the right side member 4, the lower part of the front end of the left side member 3, the lower part of the front end of the right side member 4, etc.), "rear" is the lower part of the rear subframe shown in Figure 1 (for example: Rear beam 2); "up" is the left side of the rear subframe in Figure 2, and "down" is the right side of the rear subframe in Figure 2 (for example: left lower swing arm bracket 7, right lower swing arm bracket 8 , the lower left end of the front cross member 1, the lower part of the front end of the left side member 3, the lower part of the right end of the front cross member 1, the lower part of the front end of the right side member 4, etc.).

As shown in FIG. 1 and FIG. 2, an embodiment of the present invention provides a rear subframe, including a front cross member 1, a rear cross member 2, a left longitudinal beam 3, a right longitudinal beam 4, a left toe-in bracket 5, and a right toe-in bracket 6. Left lower swing arm bracket 7, right lower swing arm bracket 8, left connecting bracket 9 and right connecting bracket 10; the left end of the rear cross beam 2 is connected to the rear end of the left longitudinal beam 3, and the right end of the rear cross beam 2 is connected The rear end of the right side member 4; the front end of the left side member 3 is connected to the left end of the front cross member 1, and the front end of the right side member 4 is connected to the right end of the front cross member 1; The left longitudinal beam 3 and the right longitudinal beam 4 are symmetrically arranged. Further, the connection between the front cross member 1 , the rear cross member 2 , the left side member 3 and the right side member 4 includes, but is not limited to, welding.

The left toe-in bracket 5 is connected to the lower left end of the front cross member 1 and the lower front end of the left longitudinal beam 3 ; the right toe-in bracket 6 is connected to the lower right end of the front cross member 1 and the front end of the right longitudinal beam 4 The lower part; to make the connection (preferably welding) between the front cross member 1, the left side member 3 and the right side member 4 more stable, and improve the performance of the rear subframe. Preferably, the left toe-in bracket 5 and the right toe-in bracket 6 are both stamped and formed structural parts to meet their strength and rigidity requirements.

The left lower swing arm bracket 7 is connected to the lower left end of the rear cross beam 2 and the lower rear end of the left longitudinal beam 3 , and the right lower swing arm bracket 8 is connected to the lower right end of the rear cross beam 2 and the right longitudinal beam. 4; in order to make the connection (preferably welding) between the left lower swing arm bracket 7 and the right lower swing arm bracket 8 and the rear cross member 2, the left side member 3 and the right side member 4 more stable, thereby improving the rear auxiliary Frame performance. Preferably, both the left lower swing arm bracket 7 and the right lower swing arm bracket 8 are stamped and formed from steel plates to meet their strength and rigidity requirements.

The left connecting bracket 9 is connected (preferably welded) between the left toe-in bracket 5 and the left lower swing arm bracket 7 ; the right connecting bracket 10 is connected (preferably welded) between the right toe-in bracket 6 and the left lower swing arm bracket 7 . between the right lower swing arm brackets 8 . In one embodiment, as shown in FIGS. 1 and 2 , the front end of the left connecting bracket 9 is connected to the lower part of the left toe-in bracket 5 , and the rear end of the left connecting bracket 9 is connected to 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 toe-in bracket 6; the rear end of the right connecting bracket 10 is connected to the front end of the right hem arm bracket 8; but in the present invention, the left connecting bracket 9 The connection method with the right connecting bracket 10 is not limited to those shown in FIG. 1 and FIG. 2 , for example, the front end of the left connecting bracket 9 (the same is true for the right connecting bracket 10 ) is connected to the side wall of the left toe-in bracket 5 . Yes, as long as it can meet its performance and lightweight requirements. Preferably, the cross-section of the left connecting bracket 9 and the right connecting bracket 10 is C-shaped, and the left connecting bracket 9 and the right connecting bracket 10 are stamped and formed from steel plates to meet their strength and rigidity requirements, Understandably, the left connecting bracket 9 and the right connecting bracket 10, which are stamped and formed into a C-shaped cross-section, can better meet the requirements of light weight compared with the tube-beam structure, and the installation process is simpler than that of the tube-beam structure. .

According to the rear subframe of the embodiment of the invention, one of the front cross member 1 , the rear cross member 2 , the left side member 3 , the right side member 4 , the left toe-in bracket 5 , the right toe-in bracket 6 , the left lower swing arm bracket 7 and the right lower swing arm bracket 8 The connection between them is stable, which can meet the requirements of vehicle durability, comfort, strength and stiffness characteristics of the vehicle, and improve the performance of the rear subframe. At the same time, the front end of the left connecting bracket 9 is connected to the lower part of the left toe-in bracket 5, 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 toe-in bracket 6; the right connecting bracket 10 The rear end is connected to the front end of the right lower swing arm bracket 8 . In this way, the rear subframe in the present invention forms two ends of the toe-in bracket (including the left toe-in bracket 5 and the right toe-in bracket 6 ) and the lower toe-in bracket (including the left toe-in bracket 7 and the right toe-in bracket 8 ) by connecting the brackets The support structure, in this way, the Y-span of the connecting bracket, significantly improves the first-order torsional mode and first-order bending mode of the rear subframe (the structural mode is increased by about 60HZ) and the installation points of the toe-in bracket and the lower swing arm bracket The dynamic stiffness value (stiffness is increased by about 200%) further improves the NVH performance; at the same time, it also significantly improves the support capacity, strength and fatigue life of the rear subframe, which makes the platform-based derivative ability of the rear subframe stronger. It can also reduce the thickness of the toe-in bracket and the lower swing arm bracket while ensuring the vehicle's durability, comfort, vehicle strength and stiffness characteristics, achieve the goal of lightweight, and reduce production costs. production efficiency. At the same time, the invention has simple structure, simple manufacturing process, high production efficiency, less investment in molds and development costs, and short development cycle.

In one embodiment, as shown in FIG. 1 and FIG. 2 , 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 and the left end of the front cross member 1 are connected to the left toe-in front plate 51, and the front end of the left connecting bracket 9, the left end of the front cross member 1 and the front end of the left longitudinal beam 3 are all connected to the left toe-in. The 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, and the front end of the right connecting bracket 10 is connected to the right toe-in front plate 61 and all The right toe-in rear plate 62, the front end of the right connecting bracket 10 and the right end of the front cross member 1 are all 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 member 1 and The front ends of the right longitudinal beams 4 are all connected to the right toe-in rear plate 62 .

Understandably, since the left toe-in bracket 5 and the right toe-in bracket 6 are the installation points, the dynamic stiffness and fatigue strength are very high here. At this time, the stamped left toe-in bracket 5 and right toe-in bracket 6 cannot form a closed section (at most, only a C-shaped section can be formed), at this time, the cross-sectional strength of the left toe-in bracket 5 and the right toe-in bracket 6 cannot be guaranteed; In this embodiment, the left toe-in front plate 51 , the left toe-in rear plate 52 , the right toe-in front plate 61 and the right toe-in rear plate 62 are all stamped and formed parts of the split type, and the split stamping process is simpler than the one-piece forming process, and The left toe-in bracket 5 is formed after the left toe-in front plate 51 and the left toe-in rear plate 52 are welded, and the right toe-in bracket 6 is formed after the right toe-in front plate 61 and the right toe-in rear plate 62 are welded; in this way, the left toe-in bracket 5 and the right toe-in bracket can be formed. 6 Under the condition of ensuring the formation of a closed section to ensure the strength of the section, the process of stamping and forming is also simpler. Understandably, in the present invention, the left toe-in bracket 5 (including the left toe-in front plate 51 and the left toe-in rear plate 52 ) and the right toe-in bracket 6 (including the right toe-in front plate 61 and the right toe-in rear plate 62 ) are connected to the front cross member 1 . , The connection method between the left side member 3 and the right side member 4 can be changed according to the needs, as long as the left toe-in bracket 5 and the left side member 3 and the front cross member 1 can be connected, the right toe-in bracket 6 and the right side member 4 and the front A closed structure is formed between the beams 1 (at this time, the left toe-in bracket 5 and the right toe-in bracket 6 both form a closed section), so as to enhance the rigidity and bearing capacity of the left toe-in bracket 5 and the right toe-in bracket 6 .

In an embodiment, as shown in FIGS. 1 and 2 , 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 connecting bracket 9 and the left end of the rear cross member 2 are connected to the left lower swing arm front plate 71, 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 swing arm The arm front plate 81 and the 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 member 2 are connected to the right lower swing arm front plate 81, so The right longitudinal beam 4 is connected to the right lower swing arm rear plate 82 .

Understandably, since the left lower swing arm bracket 7 and the right lower swing arm bracket 8 are the installation points, the dynamic rigidity and fatigue strength are very high here. If the left lower swing arm bracket 7 and the right lower swing arm bracket 8 are only composed of One-piece stamping and forming, at this time, the left lower swing arm bracket 7 and the right lower swing arm bracket 8 cannot form a closed section (at most, only a C-shaped section can be formed), at this time, the left lower swing arm bracket 7 and the right lower swing arm bracket 8 The cross-sectional strength cannot be guaranteed; in this embodiment, the left lower swing arm front plate 71, the left lower swing arm rear plate 72, the right lower swing arm front plate 81 and the right lower swing arm rear plate 82 are all stamped and formed parts of the split type. The split stamping process is simpler than the one-piece forming process, and the left hem arm bracket 7 is formed after the left hem arm front plate 71 and the left hem arm rear plate 72 are welded, and the right hem arm front plate 81 and the right hem arm rear plate 82 are formed after welding. The right lower swing arm bracket 8; in this way, the left lower swing arm bracket 7 and the right lower swing arm bracket 8 can be made to form a closed section to ensure the strength of the section, and also make the stamping process simpler. Understandably, in the present invention, 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) The connection mode with the rear cross beam 2, the left longitudinal beam 3 and the right longitudinal beam 4 can be changed according to the needs. For example, in the present invention, if the installation boundary conditions, the corresponding installation position and weight requirements When the left lower swing arm bracket 7 is connected 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 or/and the right longitudinal beam. The stringers 4 are connected together.

In one embodiment, as shown in FIG. 1 and FIG. 2 , the front end of the left lower swing arm front plate 71 is provided with a first flange (not shown) for connecting with the rear end of the left connecting bracket 9 . The front end of the front plate 81 of the right lower swing arm is provided with a second flange 83 for connecting the rear end of the left connecting bracket 9 . The shape 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 on the first flange; the rear end of the right connecting bracket 10 is welded on the second flange 83 . Understandably, as shown in FIG. 2 , the second flange 83 (similar to the first flange) is wrapped around the outer periphery of the rear end of the right connecting bracket 10 , and finally the rear end of the right connecting bracket 10 is covered. The outer periphery is welded on the inner side wall of the second display 83, so that the welding area of the two is larger and the connection is more stable.

In one embodiment, as shown in FIGS. 1 and 2 , the front cross member 1 , the left side member 3 and the right side member 4 are all tubular beam structures, and the rear cross member 2 is a stamped and formed part. That is, the front cross beam 1 , the left longitudinal beam 3 and the right longitudinal beam 4 are pipe beam structures formed by bending steel pipes, so that the three processes are simple to form and easy to process. The rear subframe is connected to the vehicle body through the front cross member 1 , the left longitudinal beam 3 and the right longitudinal beam 4 . Therefore, in the early stage of the design of the rear subframe, the pipe diameters of the front beam 1, the left longitudinal beam 3 and the right longitudinal beam 4 can be planned so that the planned pipe diameters can meet the design requirements. For example, the pipe diameters of the designed front beam 1, left longitudinal beam 3 and right longitudinal beam 4 of the rear subframe meet the following design requirements: The designed rear subframe must also meet the requirements of the vehicle body through the installation sleeve. The installation requirements of the rigid connection of the pipe 11 and the soft connection through the bushing; so that when the rear subframe is used in models focusing on different performances, it is only necessary to switch the connection method between the rear subframe and the car body (by installing the sleeve 11 or bushing connection), without the need to re-develop the rear subframe, which makes the platform derivation of the rear subframe easier and the generalization rate is higher. At the same time, the left lower swing arm bracket 7 and the right lower swing arm bracket 8 are both installed on the rear cross member 2, and the rear cross member 2 needs to bear a larger supporting force. Therefore, the rear cross member 2 is designed as a stamped and formed part, which can provide sufficient At the same time, it also meets the requirements of lightweight (compared to the tube beam structure, it can be lighter in weight with the same bearing capacity).

In one embodiment, as shown in FIG. 1 and FIG. 2 , the middle section of the front cross member 1 , the left side member 3 and the right side member 4 is circular; , The cross-sections of the rear end of the right longitudinal beam 4 and the left and right ends of the front cross beam 1 are flat. That is, in this embodiment, the middle section of the tube beam structure constituting the front cross member 1, the left side member 3 and the right side member 4 is a circular tube, and the cross section (that is, the middle section) is circular; and in this embodiment , the rear subframe is mounted on the vehicle body through the rear end of the left side member 3 , the rear end of the right side member 4 and the left and right ends of the front cross member 1 . The cross-sections of the rear end, the rear end of the right side member 4 and the left and right ends of the front cross member 1 are designed to be flat to meet installation requirements.

In one embodiment, as shown in FIGS. 1 and 2 , 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 provided with mounting holes ( Not shown); the rear end of the left side member 3, the rear end of the right side member 4 and the left and right ends of the front cross member 1 all pass through the installation sleeve 11 or the bushing passing through the installation hole Connect the body.

That is, in this embodiment, the rear subframe is used for the rear subframe through the mounting holes designed at the rear end of the left side member 3, the rear end of the right side member 4, and the left and right ends of the front cross member 1. Mounting sleeve 11 (the mounting sleeve 11 is a hollow cylindrical structure, the mounting sleeve 11 is welded on 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 bushing (the bushing The outer ring is welded on the top or inner wall of the mounting hole) to be mounted on the car body.

Understandably, in the present invention, in the early stage of the design of the rear subframe, the pipe diameters of the front cross member 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 be designed at the same time. Meet the rigid connection with the car body through the installation sleeve 11 and the soft connection through the bushing; at this time, if it is necessary to make the car model with the rear subframe meet the comfort requirements, the rear subframe is installed through the bushing (soft connection) On the vehicle body, in order to improve comfort; if it is necessary to make the vehicle model with the rear subframe meet the requirements of handling stability, the rear subframe is installed on the vehicle body through the mounting sleeve 11 (ie rigid connection, hard connection). In this way, when switching between car models corresponding to two different performances (comfort or handling stability), only the installation point of the body (that is, the rear end of the left side member 3, the right side member 4 in the present invention) only needs to be switched. The rear end and the points with mounting holes at the left and right ends of the front cross member 1) can be installed with the bushing 11 and the bushing (other parts do not need to be replaced at this time), and there is no need to re-develop a different rear auxiliary car The use of frame molds makes it easy to derive platform products, and the generalization rate of parts of the rear subframe is high, which shortens the development cycle, reduces mold investment and saves costs. At the same time, after the rigid connection with the vehicle body through the installation sleeve 11 and the soft connection through the bushing can be satisfied, the lateral span between the rear subframe and the installation point of the body can be designed as a fixed value, so that the rear auxiliary The platform-based interface between the frame and the car body is conducive to the platform-based derivation of the car body and the rear subframe, which facilitates the development of new products, further improves product development efficiency, shortens the development cycle, and reduces product development investment.

Specifically, in order to take into account the corresponding application switching of the installation sleeve 11 and the bushing to adapt to different vehicle models, the diameters of the pipe beams corresponding to the front cross member 1, the left longitudinal beam 3 and the right longitudinal beam 4 can be set first, At this time, the flat cross-sectional perimeter after the rear end of the left side member 3, the rear end of the right side member 4, and the left and right ends of the front cross member 1 is flattened, which is the same as the front cross member. 1. The perimeters of the middle section of the left longitudinal beam 3 and the right longitudinal beam 4 are equal and can be calculated according to the diameter of the pipe beam. In addition, the height of the pipe beam section 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 beam 1 must meet the installation height requirements of the installation sleeve 11 and the bushing, It should also meet the requirement that the distance between the two ends of the installation sleeve 11 and the upper and lower sides of the pipe beam is greater than or equal to 5mm, so as to meet the requirements of the height of the weld. And the rear end of the left longitudinal beam 3, the rear end of the right longitudinal beam 4 and the tube beam width of the left and right ends of the front cross beam 1 also need to meet the arrangement requirements of the bushing, so that the bushing and the The welding positions of the rear end of the longitudinal beam 3, the rear end of the right longitudinal beam 4 and the left and right ends of the front cross beam 1 have at least a welding length of 1/2 circumference, so as to make the welding firm.

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

The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the protection of the present invention. within the range.

Claims (10)

1. A rear sub-frame, characterized in that it comprises a front cross member, a rear cross member, a left longitudinal beam, a right longitudinal beam, a left toe-in bracket, a right toe-in 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 cross beam is connected to the rear end of the left longitudinal beam, 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 front end of the front cross beam the left end, the front end of the right longitudinal beam is connected to the right end of the front cross beam; 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 beam; 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 beam; the left hem The 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 swing arm bracket is connected to the lower right end of the rear cross beam and the lower rear end of the right longitudinal beam; The left connecting bracket is connected between the left toe-in bracket and the left lower swing arm bracket; the right connection bracket is connected between the right toe-in bracket and the right lower swing arm bracket. 2 . The rear subframe according to claim 1 , wherein the left toe-in bracket comprises a left toe-in front plate and a left toe-in rear plate connected to the left toe-in front plate, and the front end of the left toe-in bracket and The left end of the front cross member is connected to the left toe-in front plate, and the front end of the left connecting bracket, the left end of the front cross member 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, and the right connection bracket is connected to the right toe-in front plate and the right toe-in rear plate. The front end of the bracket and the right end of the front cross member are connected to the right toe-in front plate, and the front end of the right connecting bracket, the right end of the front cross member and the front end of the right longitudinal beam are all connected to the right toe-in rear plate. 3 . The rear sub-frame according to claim 1 , wherein the left lower swing arm bracket comprises a left lower arm front plate and a left lower arm rear plate connected to the left lower arm front plate, and the left connection The rear end of the 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; 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, and the rear end of the right connecting bracket and the right end of the rear 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 , wherein 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 is provided with a first flange. 5 . The front end of the plate is provided with a second flange for connecting the rear end of the left connecting bracket. 5 . The rear subframe according to claim 4 , wherein the rear end of the left connecting bracket is welded on the first flange; the rear end of the right connecting bracket is welded on the second flange. 6 . Flip on. 6 . The rear subframe according to claim 1 , wherein the front cross member, the left side member and the right side member are all tubular beam structures, and the rear cross member is a stamped and formed part. 7 . 7 . The rear sub-frame according to claim 6 , wherein the middle section of the front cross member, the left side member and the right side member is circular; the rear end of the left side member, The rear end of the right longitudinal beam and the left and right ends of the front cross beam have flat cross sections. 8 . The rear subframe according to claim 1 , wherein the rear end of the left side member, the rear end of the right side member, and the left and right ends of the front cross member are all 8 . Mounting holes are provided; 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 connected to the vehicle body through mounting sleeves or bushings passing through the mounting holes. 9 . The rear subframe according to claim 1 , wherein the cross-sections of the left connecting bracket and the right connecting bracket are C-shaped. 10 . 10. An automobile, characterized by comprising the rear subframe according to any one of claims 1-9.

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