WO2022151028A1

WO2022151028A1 - Five-link rear subframe and vehicle

Info

Publication number: WO2022151028A1
Application number: PCT/CN2021/071437
Authority: WO
Inventors: 侯杰; 雒蕾
Original assignee: 武汉路特斯汽车有限公司
Priority date: 2021-01-13
Filing date: 2021-01-13
Publication date: 2022-07-21
Also published as: CN116745197A

Abstract

A five-link rear subframe and a vehicle, the five-link rear subframe comprising a front transverse beam (1), a rear transverse beam (2), and two longitudinal side beams (3), which are connected between the front transverse beam (1) and the rear transverse beam (2) and are bilaterally symmetrical. The front transverse beam (1), the rear transverse beam (2) and the two longitudinal side beams (3) are all hollow and are connected to each other to form an integral hollow structure. Each longitudinal side beam (3) is a frame structure. The rear transverse beam (2) comprises a first rear transverse beam part (21) and a second rear transverse beam part (22), wherein the first rear transverse beam part (21) is substantially arranged in a horizontal direction, and the second rear transverse beam part (22) is substantially arranged in a vertical direction and is connected to the first rear transverse beam part (21), such that a side surface of the rear transverse beam (2) is formed in an L shape. The structural design of the five-link rear subframe improves the strength, stiffness, torque mode, and bending mode at an installation point of each component of a suspension system, and allows for uniform wall thickness and a light weight.

Description

A five-link rear subframe and vehicle

technical field

The invention relates to the technical field of vehicles, in particular to a five-link rear subframe and a vehicle.

Background technique

The rear subframe is an important part of the vehicle chassis, and the suspension system is fixed to the body through the rear subframe. The rear subframe has many advantages, such as it can bring good suspension connection stiffness, can reduce vibration, turn various parts in the suspension system into assemblies, improve the versatility of the suspension system, and reduce the suspension. The assembly cost of the frame system, especially the aluminum subframe, can not only achieve the above functional characteristics, but also meet the requirements of lightweight design.

However, there are still many deficiencies in the current aluminum rear subframe, for example: 1) Due to the need for multiple welding processes during manufacturing, not only the manufacturing process is complicated, but also deformation is caused during the welding process, resulting in manufacturing accuracy. 2) The space utilization of the rear subframe is low; 3) The mounting points of the various parts in the suspension system are not strong enough.

SUMMARY OF THE INVENTION

In view of the above-mentioned problems, the present invention is proposed to provide a five-link rear subframe and a vehicle that overcome the above-mentioned problems or at least partially solve the above-mentioned problems.

One object of the present invention is to solve the technical problems of the low modality of the rear subframe and the low strength of the mounting points of the various parts of the suspension system in the prior art.

A further object of the present invention is to reduce the difficulty of mold design.

Another further object of the present invention is to solve the technical problem of insufficient strength and rigidity of the front lower control arm installation site components of the rear subframe in the prior art.

Another further object of the present invention is to solve the technical problem of insufficient Y-direction stiffness and strength of the mounting point on the inner side of the spring arm of the rear subframe in the prior art.

According to one aspect of the present invention, a five-link rear subframe is provided, comprising a front beam, a rear beam, and two left-right symmetrical side longitudinal beams connected between the front beam and the rear beam, so The interiors of the front cross beam, the rear cross beam and the two side longitudinal beams are all hollow and communicate with each other to form an integral hollow structure;

Each of the side longitudinal beams is a frame structure;

The rear cross member includes a first rear cross member portion and a second rear cross member portion, and the first rear cross member portion and the second rear cross member portion are intersected and connected so that the side surface of the rear cross member is formed into an L shape.

Further, the middle part of each side longitudinal beam forms an inwardly recessed platform portion, and the sunken platform portion divides the side longitudinal beam into an upper longitudinal beam and a lower longitudinal beam, so that the upper longitudinal beam and the lower longitudinal beam are formed. The lower longitudinal beam is connected to form the frame structure through the sinking platform portion.

Further, a first through hole and a second through hole are formed in the sinking platform along the front-rear direction;

The first through hole is located on the front side of the side rail, and its structure is designed based on the motion envelope of the transmission shaft of the vehicle;

The second through hole is located at the rear side of the side rail and is used for installing the vehicle suspension, and the size of the second through hole is smaller than that of the first through hole.

Further, each of the side longitudinal beams is provided with:

an upper control arm mounting part for mounting the upper control arm of the vehicle, located at the front upper part of the side rail;

a first body mounting portion for mounting the body of the vehicle, located at the front middle portion of the side rail;

a front lower control arm mounting part for mounting the front lower control arm of the vehicle, located at the front lower part of the side rail; and

The stabilizer bar mounting part, used for mounting the stabilizer bar of the vehicle, is located at a position near the front edge of the bottom of the side rail.

Further, the front lower control arm mounting portion is formed into a U-shaped structure by extending outward from the front lower part of the side longitudinal beam, and the U-shaped structure has two opposite arm surfaces;

One of the arm surfaces has a third through hole, and the other arm surface has a threaded through hole, and the threaded through hole is integrally communicated with the side longitudinal beam.

Further, the rear beam is provided with:

Two rear wheel steering mounting parts are arranged on both sides of the rear middle part of the rear cross member at an interval from each other, and are used for installing the rear wheel steering of the vehicle;

two spring arm mounting parts, arranged at a distance from each other on both sides of the rear lower part of the rear cross member, for mounting the spring arms of the vehicle; and

Two second body mounting parts are arranged on both sides of the rear upper part of the rear cross member at a distance from each other, and are used for mounting the body of the vehicle.

Further, each of the rear wheel steering mounting parts has a support rib, the support rib connects the first rear cross beam part and the second rear cross beam part, and the support rib has the rear wheel steering An installation surface, which forms a preset angle with the YZ plane of the vehicle coordinate system.

Further, at least one opening is provided in the stress-free area at the front of the second rear cross member.

Further, the five-link rear subframe is cast by integral hollow casting.

According to another aspect of the present invention, there is provided a vehicle comprising the aforementioned five-link rear subframe.

According to the solution of the embodiment of the present invention, an integral hollow structure is formed by interconnecting the interiors of the front beam, the rear beam and the two side longitudinal beams of the five-link rear subframe, and the side longitudinal beams are constructed as a frame structure, The rear beam is hollow and the side is L-shaped, which greatly improves the installation point strength, stiffness, torque mode and bending mode of each component of the suspension system. The effect is very obvious, and the wall thickness is uniform and the weight light.

Further, by forming an inwardly concave sink portion in the middle of the side rail, and opening a first through hole and a second through hole in the sink portion, the first through holes are distributed on the front side of the side rail, and are Based on the motion envelope design of the transmission shaft, the second through holes are distributed on the rear side of the side longitudinal beam, and are used for installation and suspension. This design is convenient for the design of the mold movement, which is conducive to product demoulding and reduces the Difficulty in mold design.

Further, an upper control arm mounting portion, a first body mounting portion, a front lower control arm mounting portion and a stabilizer bar mounting portion are arranged on the side rails. The above mounting portions are designed to be attached to the side rail structure, so that the The strength and rigidity requirements of these mounting parts are met, and the requirements for the arrangement of peripheral parts are also met.

Further, by designing the structure of the front lower control arm mounting portion to be a U-shaped structure extending outward from the front and bottom of the side longitudinal beam, the U-shaped structure has two opposite arm surfaces, one of which has a third through-hole. The other arm surface has a threaded through hole, and the threaded through hole communicates with the side longitudinal beam as a whole, so as to ensure that the strength of the front lower control arm is sufficient.

Further, by tilting the rear wheel steering, that is, the rear wheel steering mounting surface and the YZ plane of the vehicle coordinate system are designed at a certain angle, which not only improves the Y-direction rigidity of the mounting point on the inner side of the spring arm of the rear subframe. and strength, and further improve the X-direction stiffness and strength of the mounting point on the inside of the spring arm.

The above description is only an overview of the technical solutions of the present invention, in order to be able to understand the technical means of the present invention more clearly, it can be implemented according to the content of the description, and in order to make the above and other objects, features and advantages of the present invention more obvious and easy to understand , the following specific embodiments of the present invention are given.

The above and other objects, advantages and features of the present invention will be more apparent to those skilled in the art from the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings.

Description of drawings

Hereinafter, some specific embodiments of the present invention will be described in detail by way of example and not limitation with reference to the accompanying drawings. The same reference numbers in the figures designate the same or similar parts or parts. It will be understood by those skilled in the art that the drawings are not necessarily to scale. In the attached picture:

1 shows a schematic structural perspective view of a five-link rear subframe according to Embodiment 1 of the present invention;

FIG. 2 shows a schematic structural diagram of a five-link rear subframe according to Embodiment 1 of the present invention;

FIG. 3 shows a schematic partial view of a side rail of a five-link rear subframe according to Embodiment 1 of the present invention;

4 shows a schematic partial view of a rear cross member of a five-link rear subframe according to Embodiment 1 of the present invention;

Fig. 5 shows another schematic partial view of the rear cross member of the five-link rear subframe according to the first embodiment of the present invention;

Fig. 6 shows another schematic partial view of the rear cross member of the five-link rear subframe according to the first embodiment of the present invention;

Fig. 7 is another schematic partial view of the rear cross member of the five-link rear subframe according to the first embodiment of the present invention.

Detailed ways

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure will be more thoroughly understood, and will fully convey the scope of the present disclosure to those skilled in the art.

Example 1:

Referring to Figures 1 and 2, the present invention provides a five-link rear subframe, the five-link rear subframe is cast in an integral hollow casting method, and the five-link rear subframe is made of aluminum The material of the rear subframe, that is, the rear subframe, is chosen to be aluminum. It includes a front cross member 1, a rear cross member 2 and two left-right symmetrical side rails 3 connected between the front cross member 1 and the rear cross member 2. The interior of the front cross member 1, the rear cross member 2 and the two side rails 3 are both. Hollow and interconnected to form a monolithic hollow structure. Each side longitudinal beam 3 is a frame structure. The rear cross member 2 includes a first rear cross member portion 21 and a second rear cross member portion 22. The first rear cross member portion 21 is arranged substantially in a horizontal direction, and the second rear cross member portion 22 is substantially arranged in a vertical direction and is connected with the first rear cross member portion 22. The cross member portions 21 are connected together so that the side surface of the rear cross member 2 is formed into an L shape.

An integral hollow structure is formed by interconnecting the interiors of the front cross member 1 , the rear cross member 2 and the two side rails 3 of the five-link rear subframe, and the side rail 3 is constructed as a frame structure, and the rear cross member 2 is a It is hollow and has an L-shape on the side, which greatly improves the strength, stiffness, torque mode, bending mode, etc. of each component of the suspension system. The effect is very obvious, and the wall thickness is uniform and the weight is light.

Referring to FIGS. 1 and 3 , the positions and structures of the left and right side longitudinal beams 3 are both left-right symmetrical, and a sunken platform portion 31 is formed in the middle of each side longitudinal beam 3 , and the sunken platform portion 31 connects the side longitudinal beams. 3 is divided into an upper longitudinal beam 32 and a lower longitudinal beam 33, and the upper longitudinal beam 32 and the lower longitudinal beam 33 are connected by the sink portion 31 to form a frame structure. The sink portion 31 is a large groove similar to an ellipse, and of course, it can also be other regular shapes or continuous irregular shapes. A first through-hole 311 and a second through-hole 312 are opened in the sink portion 31 in the front-rear direction. The first through hole 311 is located on the front side of the side rail 3 and is a hole designed based on the motion envelope of the transmission shaft. The second through hole 312 is located at the rear side of the side rail 3 and is used for mounting the suspension of the vehicle. The size of the first through hole 311 is larger than the size of the second through hole 312 . The shapes of the first through holes 311 and the second through holes 312 may be, for example, regular shapes or continuous irregular shapes.

By forming a recessed platform portion 31 inwardly recessed in the middle of the side rail 3 , and opening a first through hole 311 and a second through hole 312 in the recessed platform portion 31 , the first through holes 311 are distributed in front of the side rail 3 . It is designed based on the motion envelope of the transmission shaft, and at the same time, the second through holes 312 are distributed on the rear side of the side longitudinal beam 3, and are used for installation and suspension. This design is convenient for the design of the mold movement. It is conducive to product demoulding and reduces the difficulty of mold design.

As shown in FIG. 3 , the two side members 3 are symmetrically provided with the following structures: an upper control arm mounting portion 34 , a first vehicle body mounting portion 35 , a front lower control arm mounting portion 36 and a stabilizer bar mounting portion 37 . The upper control arm mounting portion 34 is used for mounting the upper control arm of the vehicle, and is located at the upper front portion of the side member 3 . The first body mounting portion 35 is used for mounting the body of the vehicle. The number of the first body mounting portion 35 is two, and each side rail 3 has a first body mounting portion 35 respectively, and the first body mounting portion 35 is located on the side. The front middle part of the longitudinal beam 3 . The front lower control arm mounting portion 36 is used for mounting the front lower control arm of the vehicle, and is located at the front lower portion of the side rail 3 . The stabilizer bar mounting portion 37 is used for mounting a stabilizer bar of the vehicle, and is located at a position close to the front edge of the bottom of the side rail 3 . The above installation parts are designed to be attached to the frame-type side longitudinal beam 3 structure, so that the strength and rigidity requirements of the installation points of these installation parts can be met, and the requirements for the arrangement of peripheral parts can be met.

In addition, the front lower control arm mounting portion 36 is formed into a U-shaped structure extending outward from the front and bottom of the side rail 3, and the U-shaped structure has two opposite arm surfaces, one of which has a third through hole 361, and the other arm surface has a third through hole 361. One arm surface has a threaded through hole, and the threaded through hole communicates with the side longitudinal beam 3 as a whole. This can ensure that the installation strength of the front lower control arm is sufficient.

As shown in FIGS. 2 and 4 , the rear cross beam 2 is hollow, and the first rear cross beam portion 21 and the second rear cross beam portion 22 are intersected and connected, so the design is the same as the structural design concept of the side longitudinal beam 3, which can increase the structural strength. The rear cross member 2 is provided with two rear wheel steering mounting portions 23 , two spring arm mounting portions 24 and two second vehicle body mounting portions 27 . Two rear wheel steering mounting portions 23 are arranged on both sides of the rear middle portion of the rear cross member 2 at a distance from each other, and are used for mounting rear wheel steering of the vehicle. Two spring arm mounting portions 24 are arranged at both sides of the rear lower portion of the rear cross member 2 to be spaced apart from each other for mounting the spring arms of the vehicle. Two second body mounting portions 27 are arranged on both sides of the rear upper portion of the rear cross member 2 at a distance from each other, and are used for mounting the body of the vehicle. The design of the rear wheel steering mounting portion 23 , the spring arm mounting portion 24 and the second body mounting portion 27 must be attached to the structure of the rear cross member 2 to meet the strength and rigidity requirements of the rear wheel steering, the spring arm and the body, which improves the overall sub-car The torsional mode of the frame also meets the needs of the hard point arrangement.

Referring to FIG. 5 , each rear wheel steering mounting portion 23 has a support rib 241 that connects the first rear cross beam portion 21 and the second rear cross beam portion 22 , and the support rib 241 has a rear wheel steering mounting surface 2411 . 2411 forms a preset angle with the YZ plane of the vehicle coordinate system. The vehicle coordinate system is a special moving coordinate system used to describe the motion of the vehicle. Its origin coincides with the center of mass of the vehicle. When the vehicle is stationary on a horizontal road, the X-axis points to the front of the vehicle parallel to the ground, and the Z-axis points upward through the center of mass of the vehicle. The Y-axis points to the driver's left. That is, in the vehicle coordinate system, X is the longitudinal direction of the vehicle, Y is the width direction of the vehicle, and Z is the height direction of the vehicle. The YZ plane of the vehicle coordinate system is the plane where the Y and Z axes of the vehicle are located. By forming a preset angle between the mounting surface 2411 of the rear wheel steering and the YZ plane of the vehicle coordinate system, it can be ensured that the rear wheel steering is inclined and hung relative to the vehicle body. The oblique lines in Fig. 6 indicate the direction in which the rear wheels are slanted and slanted. This design not only improves the Y-direction rigidity and strength of the inner mounting point of the spring arm of the rear subframe, but also further improves the X-direction rigidity and strength of the inner mounting point of the spring arm. In addition, a bolt hole 242 can be opened on the installation surface, and the rear wheel steering can be installed through the bolt hole 242, and the engagement length of the rear wheel steering can be ensured enough. The second rear cross member 22 plays a role of reinforcement. After using this design, the strength and stiffness of the rear subframe mounting point have been significantly improved.

Referring to FIG. 7 , at least one opening 25 is opened in the non-stress area at the front of the second rear cross member 22 for reducing the weight of the vehicle. The shape of the opening 25 is, for example, a square or a rhombus, and other opening shapes are also possible, as long as the opening 25 is provided in the non-stressed area.

Correspondingly, the present invention also provides a vehicle comprising the aforementioned five-link rear subframe.

Embodiment 2:

The difference between the second embodiment and the first embodiment is that the five-link rear subframe adopts the method of casting and welding to realize the structure in the first embodiment. Compared with the first embodiment, the embodiment of the present invention increases the welding process, thus increasing the fatigue failure problem of the welding seam, and there is a risk, but at the same time, the requirements for the design of the casting mold are reduced.

By now, those skilled in the art will appreciate that, although exemplary embodiments of the present invention have been illustrated and described in detail herein, it is still possible to directly follow the present disclosure without departing from the spirit and scope of the present invention. Numerous other variations or modifications can be identified or derived consistent with the principles of the present invention. Accordingly, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.

Claims

A five-link rear subframe includes a front beam, a rear beam, and two left-right symmetrical side longitudinal beams connected between the front beam and the rear beam, the front beam, the rear beam and The interiors of the two side longitudinal beams are hollow and communicate with each other to form an integral hollow structure;

Each of the side longitudinal beams is a frame structure;

The rear cross member includes a first rear cross member portion and a second rear cross member portion, and the first rear cross member portion and the second rear cross member portion are intersected and connected, so that the side surface of the rear cross member is formed into an L shape.
The five-link rear subframe according to claim 1, wherein the middle part of each side rail is formed with an inwardly recessed platform portion, and the sink platform portion divides the side rail into upper longitudinal beams. The upper and lower longitudinal beams are connected to form the frame structure through the sinking platform.
The five-link rear sub-frame according to claim 2, wherein a first through hole and a second through hole are formed in the countersunk portion along the front-rear direction;

The first through hole is located on the front side of the side rail, and its structure is designed based on the motion envelope of the transmission shaft of the vehicle;

The second through hole is located at the rear side of the side rail and is used for installing the vehicle suspension, and the size of the second through hole is smaller than that of the first through hole.
The five-link rear subframe according to any one of claims 1-3, wherein each of the side rails is provided with:

an upper control arm mounting part for mounting the upper control arm of the vehicle, located at the front upper part of the side rail;

a first body mounting portion for mounting the body of the vehicle, located at the front middle portion of the side rail;

a front lower control arm mounting part for mounting the front lower control arm of the vehicle, located at the front lower part of the side rail; and

The stabilizer bar mounting part, used for mounting the stabilizer bar of the vehicle, is located at a position near the front edge of the bottom of the side rail.
The five-link rear subframe according to claim 4, wherein the front lower control arm mounting portion is formed into a U-shaped structure extending outward from the front and lower sides of the side rails, and the U-shaped structure has opposite the two arm faces;

One of the arm surfaces has a third through hole, and the other arm surface has a threaded through hole, and the threaded through hole is integrally communicated with the side longitudinal beam.
The five-link rear subframe according to any one of claims 1-3 and 5, wherein the rear cross member is provided with:

Two rear wheel steering mounting parts are arranged on both sides of the rear middle part of the rear cross member at an interval from each other, and are used for installing the rear wheel steering of the vehicle;

two spring arm mounting parts, arranged at a distance from each other on both sides of the rear lower part of the rear cross member, for mounting the spring arms of the vehicle; and

Two second body mounting parts are arranged on both sides of the rear upper part of the rear cross member at a distance from each other, and are used for mounting the body of the vehicle.
The five-link rear subframe according to claim 6, wherein each of the rear wheel steering mounting portions has a support rib, and the support rib connects the first rear cross member portion and the second rear cross member portion, And the support rib has the installation surface for the rear wheel steering, and the installation surface forms a preset angle with the YZ plane of the vehicle coordinate system.
The five-link rear subframe according to claim 7, wherein at least one opening is defined in the non-stressed area of the front portion of the second rear cross member.
The five-link rear subframe according to any one of claims 1-3, 5 and 7-8, wherein the five-link rear subframe is cast by using an integral hollow casting method.
A vehicle comprising a five-link rear subframe as claimed in any one of claims 1-9.