Five-link rear subframe and vehicle

Abstract

A five-link rear subframe and vehicle include a front crossbeam (1), a rear crossbeam (2), and two symmetrical side longitudinal beams (3) connecting the front crossbeam (1) and the rear crossbeam (2). The front crossbeam (1), the rear crossbeam (2), and the two side longitudinal beams (3) are all hollow inside and interconnected to form an integral hollow structure. Each side longitudinal beam (3) is a frame structure. The rear crossbeam (2) includes a first rear crossbeam section (21) and a second rear crossbeam section (22). The first rear crossbeam section (21) is arranged substantially horizontally and is arranged substantially vertically with the second rear crossbeam section (22) and connected to the first rear crossbeam section (21), thereby forming an L-shape on the side of the rear crossbeam (2). The structural design of this five-link rear subframe improves the strength, stiffness, torque mode, and bending mode of the mounting points of various components of the suspension system, and has uniform wall thickness and light weight.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, and more particularly to a five-link rear subframe and vehicle. Background Technology

[0002] The rear subframe is an important component of the vehicle chassis, through which the suspension system is fixed to the body. The rear subframe has many advantages, such as providing excellent suspension connection stiffness, reducing vibration, integrating the various components of the suspension system into an assembly, improving the versatility of the suspension system, and reducing the assembly cost of the suspension system. In particular, aluminum subframes can not only achieve the above functional characteristics, but also meet the requirements of lightweight design.

[0003] However, the current aluminum rear subframe still has many shortcomings, such as: 1) Due to the need for multiple welding processes during manufacturing, the manufacturing process is not only more complicated, but deformation can also occur during the welding process, resulting in lower manufacturing precision. As a result, the aluminum frame is not as flexible in design as the steel frame; 2) The space utilization rate of the rear subframe is low; 3) The installation points of various components in the suspension system are not strong enough. Summary of the Invention

[0004] In view of the above problems, the present invention is proposed to provide a five-link rear subframe and vehicle that overcomes or at least partially solves the above problems.

[0005] One objective of this invention is to solve the technical problems of low modal strength of the rear subframe and low strength of the mounting points of various components of the suspension system in the prior art.

[0006] A further objective of this invention is to reduce the difficulty of mold design.

[0007] Another further objective of the present invention is to solve the technical problem of insufficient strength and rigidity of the front lower control arm mounting point component of the rear subframe in the prior art.

[0008] Another objective 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.

[0009] According to one aspect of the present invention, a five-link rear subframe is provided, including a front crossbeam, a rear crossbeam, and two symmetrical side longitudinal beams connected between the front crossbeam and the rear crossbeam, wherein the front crossbeam, the rear crossbeam, and the two side longitudinal beams are all hollow inside and interconnected to form an integral hollow structure.

[0010] All of the aforementioned side longitudinal beams are frame structures;

[0011] The rear crossbeam includes a first rear crossbeam portion and a second rear crossbeam portion, which are connected to each other, thereby forming an L-shape on the side of the rear crossbeam.

[0012] Furthermore, each of the side longitudinal beams has an inwardly recessed platform in the middle, which divides the side longitudinal beam into an upper longitudinal beam and a lower longitudinal beam, and the upper longitudinal beam and the lower longitudinal beam are connected through the platform to form the frame structure.

[0013] Furthermore, the recessed platform is provided with a first through hole and a second through hole along the front-rear direction;

[0014] The first through hole is located on the front side of the side longitudinal beam, and its structure is designed based on the motion envelope of the vehicle's drive shaft.

[0015] The second through hole is located on the rear side of the side longitudinal beam and is used to install the vehicle's suspension, and its size is smaller than that of the first through hole.

[0016] Furthermore, each of the said side longitudinal beams is provided with:

[0017] Upper control arm mounting part, used to mount the upper control arm of the vehicle, is located at the upper front part of the side longitudinal beam;

[0018] The first body mounting part is used to mount the body of the vehicle and is located at the front center of the side longitudinal beam;

[0019] Front lower control arm mounting portion, for mounting the front lower control arm of the vehicle, located at the lower front part of the side longitudinal beam; and

[0020] A stabilizer bar mounting section, used to mount the stabilizer bar of the vehicle, is located at the bottom of the side longitudinal beam near the leading edge.

[0021] Furthermore, the front lower control arm mounting portion extends outward from the side longitudinal beam in the front-lower direction to form a U-shaped structure, and the U-shaped structure has two opposing arm surfaces;

[0022] One of the arm faces has a third through hole, and the other arm face has a threaded through hole, and the threaded through hole is integrated with the side longitudinal beam.

[0023] Furthermore, the rear crossbeam is provided with:

[0024] Two rear wheel steering mounting parts are arranged at intervals on both sides of the rear center of the rear crossbeam for mounting the vehicle's rear wheel steering.

[0025] Two spring arm mounting portions are arranged at intervals on both sides of the lower rear portion of the rear crossbeam for mounting the spring arms of the vehicle; and

[0026] Two second body mounting parts are arranged at intervals on both sides of the upper rear part of the rear crossbeam for mounting the body of the vehicle.

[0027] Furthermore, each of the rear wheel steering mounting portions has a support rib, the support rib connecting the first rear crossbeam portion and the second rear crossbeam portion, and the support rib has the mounting surface for the rear wheel steering, the mounting surface forming a preset angle with the YZ plane of the vehicle coordinate system.

[0028] Furthermore, at least one opening is provided in the non-stress area of ​​the front part of the second rear crossbeam.

[0029] Furthermore, the five-link rear subframe is cast using an integral hollow casting method.

[0030] According to another aspect of the invention, a vehicle is provided, including the aforementioned five-link rear subframe.

[0031] According to the embodiment of the present invention, by connecting the front crossbeam, rear crossbeam and two side longitudinal beams of the five-link rear subframe to form an integral hollow structure, and constructing the side longitudinal beams as a frame structure, and the rear crossbeam being hollow with an L-shaped side, the strength, stiffness, torque mode and bending mode of the mounting points of each component of the suspension system are greatly improved, the effect is very obvious, and the wall thickness is uniform and the weight is light.

[0032] Furthermore, by forming an inwardly recessed platform in the middle of the side longitudinal beam, and opening a first through hole and a second through hole in the platform, the first through hole is distributed on the front side of the side longitudinal beam and is designed based on the motion envelope of the drive shaft. At the same time, the second through hole is distributed on the rear side of the side longitudinal beam and is used for mounting and suspension. This design facilitates the design of mold movement, is beneficial for product demolding, and reduces the difficulty of mold design.

[0033] Furthermore, an upper control arm mounting part, a first body mounting part, a front lower control arm mounting part, and a stabilizer bar mounting part are provided on the side longitudinal beam. The design of each of these mounting parts is attached to the side longitudinal beam structure, so as to meet the strength and rigidity requirements of these mounting parts, as well as the requirements of the surrounding parts layout.

[0034] Furthermore, by designing the structure of the front lower control arm mounting part as a U-shaped structure extending outward from the front and lower direction of the side longitudinal beam, the U-shaped structure has two opposing arm faces, one arm face having a third through hole and the other arm face having a threaded through hole, and the threaded through hole is connected to the side longitudinal beam as a whole, thereby ensuring that the strength of the front lower control arm is sufficient.

[0035] Furthermore, by tilting the rear wheel steering at an angle, the rear wheel steering mounting surface is designed to be at a certain angle to the YZ plane of the vehicle coordinate system. This design not only improves the Y-direction stiffness and strength of the inner mounting point of the rear subframe spring arm, but also further improves the X-direction stiffness and strength of the inner mounting point of the spring arm.

[0036] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below.

[0037] The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0038] The following sections will describe some specific embodiments of the invention in a detailed manner by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or portions. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0039] Figure 1 A schematic perspective view of a five-link rear subframe according to Embodiment 1 of the present invention is shown;

[0040] Figure 2 A schematic structural diagram of a five-link rear subframe according to Embodiment 1 of the present invention is shown;

[0041] Figure 3 A schematic partial view of the side longitudinal beam of the five-link rear subframe according to Embodiment 1 of the present invention is shown;

[0042] Figure 4 A schematic partial view of the rear crossbeam of the five-link rear subframe according to Embodiment 1 of the present invention is shown;

[0043] Figure 5 Another schematic partial view of the rear crossbeam of the five-link rear subframe according to Embodiment 1 of the present invention is shown;

[0044] Figure 6 Another schematic partial view of the rear crossbeam of the five-link rear subframe according to Embodiment 1 of the present invention is shown;

[0045] Figure 7 Another schematic partial view of the rear crossbeam of the five-link rear subframe according to Embodiment 1 of the present invention is shown. Detailed Implementation

[0046] Exemplary embodiments of the present disclosure will now be described in more detail 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 implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0047] Example 1:

[0048] See Figure 1 and Figure 2 This invention provides a five-link rear subframe, which is cast using an integral hollow casting method and is made of aluminum. It includes a front crossbeam 1, a rear crossbeam 2, and two symmetrical side longitudinal beams 3 connecting the front crossbeam 1 and the rear crossbeam 2. The front crossbeam 1, the rear crossbeam 2, and the two side longitudinal beams 3 are all hollow and interconnected to form an integral hollow structure. Each side longitudinal beam 3 is a frame structure. The rear crossbeam 2 includes a first rear crossbeam portion 21 and a second rear crossbeam portion 22. The first rear crossbeam portion 21 is substantially horizontal, and the second rear crossbeam portion 22 is substantially vertical and connected to the first rear crossbeam portion 21, thus forming an L-shape on the side of the rear crossbeam 2.

[0049] By connecting the front crossbeam 1, rear crossbeam 2, and two side longitudinal beams 3 of the five-link rear subframe to form an integral hollow structure, and constructing the side longitudinal beams 3 as a frame structure, and making the rear crossbeam 2 hollow with an L-shaped side, the strength, stiffness, torque mode, and bending mode of the mounting points of each component of the suspension system are greatly improved. The effect is very obvious, and the wall thickness is uniform and the weight is light.

[0050] See Figure 1 and Figure 3 The positions and structures of the two side longitudinal beams 3 are symmetrical. Each side longitudinal beam 3 has an inwardly recessed platform 31 in its center, which divides the side longitudinal beam 3 into an upper longitudinal beam 32 and a lower longitudinal beam 33, connecting them to form a frame structure. The platform 31 is a large, elliptical-shaped recess, but it can also be other regular or continuous irregular shapes. A first through hole 311 and a second through hole 312 are formed in the platform 31 along the front-rear direction. The first through hole 311 is located on the front side of the side longitudinal beam 3 and is designed based on the motion envelope of the drive shaft. The second through hole 312 is located on the rear side of the side longitudinal beam 3 and is used to mount the vehicle's suspension. 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 hole 311 and the second through hole 312 can both be regular or continuous irregular shapes.

[0051] By forming an inwardly recessed platform 31 in the middle of the side longitudinal beam 3, and opening a first through hole 311 and a second through hole 312 in the platform 31, the first through hole 311 is distributed on the front side of the side longitudinal beam 3 and is designed based on the motion envelope of the drive shaft. At the same time, the second through hole 312 is distributed on the rear side of the side longitudinal beam 3 and is used for mounting and suspension. This design facilitates the design of mold movement, is beneficial for product demolding, and reduces the difficulty of mold design.

[0052] like Figure 3 As shown, the following structures are symmetrically arranged on the two side longitudinal beams 3: an upper control arm mounting part 34, a first body mounting part 35, a front lower control arm mounting part 36, and a stabilizer bar mounting part 37. The upper control arm mounting part 34 is used to mount the vehicle's upper control arm and is located at the upper front part of the side longitudinal beam 3. The first body mounting part 35 is used to mount the vehicle's body; there are two first body mounting parts 35, one on each side longitudinal beam 3, located at the middle of the front part of the side longitudinal beam 3. The front lower control arm mounting part 36 is used to mount the vehicle's front lower control arm and is located at the lower front part of the side longitudinal beam 3. The stabilizer bar mounting part 37 is used to mount the vehicle's stabilizer bar and is located at the bottom of the side longitudinal beam 3 near the leading edge. The design of these mounting parts is based on the frame-type side longitudinal beam 3 structure, thus meeting the strength and rigidity requirements of the mounting points and satisfying the requirements of the surrounding component arrangement.

[0053] Furthermore, the front lower control arm mounting portion 36 extends outward from the side longitudinal beam 3 in a U-shaped structure. This U-shaped structure has two opposing arm faces, one of which has a third through hole 361, and the other arm face has a threaded through hole, which is integrated with the side longitudinal beam 3. This ensures that the installation strength of the front lower control arm is sufficient.

[0054] like Figure 2 and Figure 4As shown, the rear crossbeam 2 is hollow, and the first rear crossbeam portion 21 and the second rear crossbeam portion 22 intersect and connect. This design shares the same structural design concept as the side longitudinal beam 3, which increases the structural strength. The rear crossbeam 2 is equipped with two rear wheel steering mounting portions 23, two spring arm mounting portions 24, and two second body mounting portions 27. The two rear wheel steering mounting portions 23 are spaced apart on both sides of the rear middle portion of the rear crossbeam 2, used to mount the vehicle's rear wheel steering. The two spring arm mounting portions 24 are spaced apart on both sides of the lower rear portion of the rear crossbeam 2, used to mount the vehicle's spring arms. The two second body mounting portions 27 are spaced apart on both sides of the upper rear portion of the rear crossbeam 2, used to mount the vehicle body. The design of the rear wheel steering mounting portions 23, spring arm mounting portions 24, and second body mounting portions 27 must be dependent on the structure of the rear crossbeam 2 to meet the strength and rigidity requirements of the rear wheel steering, spring arms, and body, improving the torsional mode of the overall subframe and also satisfying the requirements for hard point placement.

[0055] See Figure 5 Each rear wheel steering mounting part 23 has a support rib 241, which connects the first rear crossbeam part 21 and the second rear crossbeam part 22. The support rib 241 has a rear wheel steering mounting surface 2411, which forms a preset angle with the YZ plane of the vehicle coordinate system. This vehicle coordinate system is a special moving coordinate system used to describe vehicle motion. Its origin coincides with the vehicle's center of gravity. When the vehicle is stationary on a level road, the X-axis is parallel to the ground and points forward, the Z-axis passes through the vehicle's center of gravity and points upward, and the Y-axis points to the driver's left. In other words, in this vehicle coordinate system, X represents the vehicle's length, Y represents its width, and Z represents its height. The YZ plane of the vehicle coordinate system is the plane containing the vehicle's Y and Z axes. By forming a preset angle between the rear wheel steering mounting surface 2411 and the YZ plane of the vehicle coordinate system, the rear wheel steering can be tilted relative to the vehicle body. Figure 6 The diagonal line indicates the direction of the rear wheel steering tilt. This design not only improves the Y-axis stiffness and strength of the inner mounting point of the rear subframe spring arm, but also further improves the X-axis stiffness and strength of the same mounting point. Furthermore, bolt holes 242 can be made on this mounting surface to install the rear wheel steering mechanism, ensuring sufficient engagement length for the rear wheel steering. Simultaneously, the support rib 241 connects the first rear crossbeam portion 21 and the second rear crossbeam portion 22, providing reinforcement. With this design, the strength and stiffness of the rear subframe mounting point are significantly improved.

[0056] See Figure 7The non-stress area at the front of the second rear crossbeam 22 has at least one opening 25 for weight reduction of the vehicle. The shape of the opening 25 may be square or rhomboid, or other opening shapes, as long as the opening 25 is made in the non-stress area.

[0057] Accordingly, the present invention also provides a vehicle including the aforementioned five-link rear subframe.

[0058] Example 2:

[0059] The difference between Embodiment 2 and Embodiment 1 is that the five-link rear subframe is achieved through casting and welding to realize the structure of Embodiment 1. This embodiment of the invention adds a welding process compared to Embodiment 1, thus increasing the risk of weld fatigue failure, but at the same time reducing the requirements for casting mold design.

[0060] Therefore, those skilled in the art should recognize that although exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications conforming to the principles of the present invention can be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Thus, the scope of the present invention should be understood and recognized as covering all such other variations or modifications.

Claims

1. A five-link rear subframe, comprising a front crossbeam, a rear crossbeam, and two symmetrical side longitudinal beams connected between the front crossbeam and the rear crossbeam, wherein the front crossbeam, the rear crossbeam, and the two side longitudinal beams are all hollow inside and interconnected to form an integral hollow structure. All of the aforementioned side longitudinal beams are frame structures; The rear crossbeam includes a first rear crossbeam portion and a second rear crossbeam portion, the first rear crossbeam portion and the second rear crossbeam portion intersecting and connecting, thereby forming an L-shape on the side of the rear crossbeam; in, Each of the side longitudinal beams has an inwardly recessed platform in the middle, which divides the side longitudinal beam into an upper longitudinal beam and a lower longitudinal beam, and the upper longitudinal beam and the lower longitudinal beam are connected through the platform to form the frame structure. The recessed platform is provided with a first through hole and a second through hole along the front-to-back direction. The first through hole is located on the front side of the side longitudinal beam, and its structure is designed based on the motion envelope of the vehicle's drive shaft. The second through hole is located on the rear side of the side longitudinal beam and is used to install the vehicle's suspension, and its size is smaller than that of the first through hole.

2. The five-link rear subframe according to claim 1, wherein, Each of the aforementioned side longitudinal beams is provided with: Upper control arm mounting part, used to mount the upper control arm of the vehicle, is located at the upper front part of the side longitudinal beam; The first body mounting part is used to mount the body of the vehicle and is located at the front center of the side longitudinal beam; A front lower control arm mounting section is used to mount the front lower control arm of the vehicle and is located at the front lower part of the side longitudinal beam; as well as A stabilizer bar mounting section, used to mount the stabilizer bar of the vehicle, is located at the bottom of the side longitudinal beam near the leading edge.

3. The five-link rear subframe according to claim 2, wherein, The front lower control arm mounting part extends outward from the side longitudinal beam in the front lower direction to form a U-shaped structure, and the U-shaped structure has two opposing arm surfaces; One of the arm faces has a third through hole, and the other arm face has a threaded through hole, and the threaded through hole is integrated with the side longitudinal beam.

4. The five-link rear subframe according to any one of claims 1-3, wherein, The rear crossbeam is equipped with: Two rear wheel steering mounting parts are arranged at intervals on both sides of the rear center of the rear crossbeam for mounting the vehicle's rear wheel steering. Two spring arm mounting portions are arranged at intervals on both sides of the lower rear part of the rear crossbeam for mounting the spring arms of the vehicle. as well as Two second body mounting parts are arranged at intervals on both sides of the upper rear part of the rear crossbeam for mounting the body of the vehicle.

5. The five-link rear subframe according to claim 4, wherein, Each of the rear wheel steering mounting parts has a support rib, the support rib connects the first rear crossbeam part and the second rear crossbeam part, and the support rib has a mounting surface for mounting the rear wheel steering, the mounting surface forming a preset angle with the YZ plane of the vehicle coordinate system.

6. The five-link rear subframe according to claim 5, wherein, The non-stress zone at the front of the second rear crossbeam has at least one opening.

7. The five-link rear subframe according to any one of claims 1-3 and 5-6, wherein, The five-link rear subframe is cast using an integral hollow casting method.

8. A vehicle comprising a five-link rear subframe as claimed in any one of claims 1-7.

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