A lightweight electric vehicle rear subframe structure

Abstract

The present invention belongs to the technical field of new energy vehicles, and more specifically, relates to a lightweight electric vehicle rear subframe structure. The structure comprises a left front tie rod assembly mounting bracket (1), a left front tie rod assembly reinforcement support plate (2), a left rear upper control arm support (3), a front crossbeam (4), a patch (5), a right rear upper control arm support (6), a right front tie rod assembly mounting bracket (7), a right longitudinal beam (8), a right support tube (9), a lower swing arm connecting bracket (10), a rear crossbeam (11), a left support tube (12), and a left longitudinal beam (13). The lightweight electric vehicle rear subframe structure of the present invention has a simple structure, meets the rigidity and strength performance, effectively reduces the chassis weight, reduces the difficulty of the welding process, releases concentrated stress, and improves fatigue durability. While meeting the rigidity and strength performance of the entire rear subframe, it effectively improves the vehicle NVH performance and the vehicle modal frequency, avoids resonance problems, and improves the overall performance of the electric vehicle.

Description

Technical Field

[0001] The present invention belongs to the technical field of new energy vehicles, and more specifically, relates to a lightweight rear subframe structure of an electric vehicle. Background Art

[0002] In the current pure electric vehicle market, most rear subframe structures follow the layout of traditional fuel-powered vehicles. Traditional rear subframes are primarily constructed of steel, with only a few models utilizing aluminum alloy subframes. As a key structural component of the chassis system, the rear subframe connects to the suspension and secures chassis components such as the drive motor system, swingarm, and upper and lower control arms. It also enhances vehicle rigidity, dampens ground and motor vibration, and improves overall comfort. Currently, lightweighting is a core technology for the development of energy-saving and new energy vehicles. Strengthening the research and development of key chassis technologies for pure electric vehicles, innovative designs for key chassis components, and research into new lightweight materials and processes is particularly important. Pure electric vehicles replace traditional engines with drive motors as their power source. The integrated design of the rear drive motor and reducer results in a large and complex motor system, making it difficult to find an ideal layout within traditional vehicle chassis development platforms. The lack of a fully designed rear subframe structure for rear suspension mounting and motor system attachment has resulted in subpar handling and comfort.

[0003] In the prior art, there is a technology named "pure electric vehicle lightweight body rear subframe" and with publication number "CN202463931U", which includes two mutually parallel and horizontally arranged shock absorber support beams supporting the rear shock absorber of the electric vehicle main frame, one end of each of the two shock absorber support beams is respectively provided with a support beam hinge lug connected to the main frame, and the other end of each of the two shock absorber support beams is respectively provided with a hanging beam vertically upward, and the top of the hanging beam is provided with a hanging beam hinge lug connected to the main frame, the width of the connection point between the two hanging beams and the main frame is greater than the width of the connection point between the two shock absorber support beams and the main frame, and a reinforced fixed beam is respectively provided between the two shock absorber support beams and between the two hanging beams. The utility model has a simple structure and is easy to process and install. Since the subframe is connected to the main frame by a hinge, the subframe has a certain degree of freedom of movement relative to the main frame, which has a good effect on dissipating impact force and shock-absorbing impact relay. The bidirectional dimensional structure of the bent tube beam in the subframe greatly improves the impact resistance.

[0004] However, this technology does not involve the technical problems and technical solutions of the present application. Summary of the Invention

[0005] The technical problem to be solved by the present invention is: in view of the shortcomings of the existing technology, a lightweight electric vehicle rear subframe structure with a simple structure is provided, which not only meets the rigidity and strength performance, but also effectively reduces the chassis weight, reduces the difficulty of the welding process, releases concentrated stress, and improves fatigue durability. While meeting the overall rigidity and strength performance of the rear subframe, it effectively improves the NVH performance and the modal frequency of the whole vehicle, avoids resonance problems, and improves the overall performance of the electric vehicle.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is:

[0007] The present invention is a lightweight electric vehicle rear subframe structure, comprising a left front tie rod assembly mounting bracket, a left front tie rod assembly reinforcement support plate, a left rear upper control arm support, a front crossbeam, a patch, a right rear upper control arm support, a right front tie rod assembly mounting bracket, a right longitudinal beam, a right support tube, a lower swing arm connecting bracket, a rear crossbeam, a left support tube, a left longitudinal beam, the left rear upper control arm support is welded to the left longitudinal beam and the front crossbeam through the left rear upper control arm support reinforcement folding edge I and the left rear upper control arm support reinforcement folding edge II, and the left front tie rod assembly is mounted on the left rear upper control arm support bracket. The inner plate reinforcement plate of the mounting support is welded to the left front tie rod assembly mounting support outer plate and the left longitudinal beam on both sides of the left rear upper control arm support; the left front tie rod assembly mounting support is welded to the left longitudinal beam through the left front tie rod assembly mounting support inner plate reinforcement plate, the end of the left front tie rod assembly mounting support outer plate is welded to the front cross beam, a left front tie rod assembly mounting support reinforcement support is provided inside the left front tie rod assembly mounting support outer plate, and the left front tie rod assembly mounting support reinforcement support is welded to the left front tie rod assembly mounting support outer plate and the left longitudinal beam.

[0008] The right rear upper control arm support is welded to the right longitudinal beam and the front cross beam through the right rear upper control arm support reinforcement folding edge I and the right rear upper control arm support reinforcement folding edge II, and the right front tie rod assembly mounting support inner plate reinforcement plate is welded to the right front tie rod assembly mounting support outer plate and the right longitudinal beam on both sides of the right rear upper control arm support; the right front tie rod assembly mounting support is welded to the right longitudinal beam through the right front tie rod assembly mounting support inner plate reinforcement plate, the end of the right front tie rod assembly mounting support outer plate is welded to the front cross beam, a right front tie rod assembly mounting support reinforcement support is provided inside the right front tie rod assembly mounting support outer plate, and the right front tie rod assembly mounting support reinforcement support is welded to the right front tie rod assembly mounting support outer plate and the right longitudinal beam.

[0009] The left rear upper control arm support includes an arc leakage hole, a left rear upper control arm support reinforcement folding edge I welded to the front cross beam, a left rear upper control arm assembly hole, a left rear upper control arm support reinforcement plate, and a left rear upper control arm support reinforcement folding edge II welded to the longitudinal beam; the right rear upper control arm support includes an arc leakage hole, a right rear upper control arm support reinforcement folding edge I welded to the front cross beam, a right rear upper control arm assembly hole, a right rear upper control arm support reinforcement plate, and a right rear upper control arm support reinforcement folding edge II welded to the longitudinal beam.

[0010] The left front tie rod assembly mounting support includes a front tie rod assembly assembly hole, a process groove, a left rear upper control arm support reinforcement plate, an arc leakage hole, a welding edge with the front cross beam, and a welding edge with the longitudinal beam; the right front tie rod assembly mounting support includes a front tie rod assembly assembly hole, a process groove, a right rear upper control arm support reinforcement plate, an arc leakage hole, a welding edge with the front cross beam, and a welding edge with the longitudinal beam.

[0011] The left support tube is welded to the rear cross beam and the left longitudinal beam, and the welding position of the left support tube and the left longitudinal beam is located on the opposite side of the welding position of the left rear upper control arm support reinforcement folding edge I and the left longitudinal beam, so that the left rear upper control arm support reinforcement folding edge II of the left rear upper control arm support is located on the extension line of the left support tube.

[0012] The welding position of the left support tube and the left longitudinal beam is located on the opposite side of the welding position of the left front tie rod assembly mounting support reinforced folded edge I and the left longitudinal beam, so that the left front tie rod assembly mounting support reinforced folded edge II of the left front tie rod assembly mounting support is located on the extension line of the left support tube.

[0013] The right support tube is welded to the rear cross beam and the right longitudinal beam, and the welding position of the right support tube and the right longitudinal beam is located on the opposite side of the welding position of the right rear upper control arm support reinforcement folding edge I and the right longitudinal beam, so that the right rear upper control arm support reinforcement folding edge II of the right rear upper control arm support is located on the extension line of the right support tube.

[0014] The welding position of the right support tube and the right longitudinal beam is located on the opposite side of the welding position of the right front tie rod assembly mounting support reinforcement folding edge I and the right longitudinal beam, so that the right front tie rod assembly mounting support reinforcement folding edge II of the right front tie rod assembly mounting support is located on the extension line of the right support tube.

[0015] The lower swing arm connecting support is welded on the rear cross beam, the lower swing arm connecting support reinforcement plate is arranged inside the lower swing arm connecting support, and the lower swing arm connecting support reinforcement plate connects the lower swing arm connecting support and the rear cross beam.

[0016] The lower swing arm connecting support includes a left lower swing arm connecting support and a right lower swing arm connecting support, and each lower swing arm connecting support includes a lower swing arm assembly hole, a welding edge with the rear cross beam, and a process hole.

[0017] The technical solution of the present invention is adopted, and the working principle and beneficial effects are as follows:

[0018] The lightweight electric vehicle rear subframe structure described in the present invention is designed such that the upper control arm connecting support, the front pull rod assembly mounting support, and the lower swing arm connecting support are welded with high-strength aluminum alloy plates during structural setting, which not only meets the rigidity performance but also effectively reduces the chassis weight. The upper control arm connecting supports on both sides of the subframe are welded to the longitudinal beams (left longitudinal beam and right longitudinal beam) on both sides of the subframe and the front crossbeam, which can effectively improve the connection rigidity between the subframe and the suspension; arc-shaped process holes (leakage holes) are provided at the welds between the upper control arm connecting support and the longitudinal beams, which can effectively reduce the difficulty of the welding process, release concentrated stress, and improve fatigue durability. The lower swing arm connecting support is welded in a split manner on both sides of the rear crossbeam and is cast with high-strength aluminum alloy plates. The built-in support plate is lighter in weight than the traditional integrated support. While meeting the overall rigidity performance of the rear subframe, it can effectively improve the NVH performance and the modal frequency of the entire vehicle and avoid resonance problems. Support tubes are installed at both ends of the rear subframe's longitudinal crossmember. These are welded to the rear crossmember and both longitudinal members, forming a triangular structure. The welds between the support tubes and the longitudinal members are located opposite the welds between the upper control arm support and the longitudinal member, and the tie rod assembly support and the longitudinal member. A straight line runs from the weld between the support tubes and the rear crossmember, through the welds between the support tubes and the longitudinal member, to the connection points between the upper control arm support and the upper control arm, and between the tie rod assembly support and the tie rod assembly. Each of these connection points is projected onto the extension of the support tubes, forming a straight line that runs through the longitudinal member. This arrangement of left and right support tubes effectively improves the overall stiffness, torsional rigidity, and crash safety of the rear subframe. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The following is a brief description of the contents and symbols in the drawings of this specification:

[0020] Figure 1 This is a schematic structural diagram of the rear subframe structure of a lightweight electric vehicle according to the present invention;

[0021] Figure 2 This is a structural schematic diagram of a rear upper control arm support of a lightweight electric vehicle rear subframe structure according to the present invention;

[0022] Figure 3 This is a structural schematic diagram of the front tie rod assembly mounting bracket of the rear subframe structure of the lightweight electric vehicle according to the present invention;

[0023] Figure 4 This is a structural schematic diagram of the lower swing arm connecting support of the rear subframe structure of a lightweight electric vehicle according to the present invention;

[0024] Figure 5 This is a structural schematic diagram of the welding of the lower arm support of the rear subframe structure of the lightweight electric vehicle according to the present invention;

[0025] Figure 6This is a schematic diagram of the forward structure of the rear subframe structure of a lightweight electric vehicle according to the present invention;

[0026] Figure 7 This is a structural schematic diagram of the welding of the upper control arm support and the tie rod assembly mounting support of the rear subframe structure of the lightweight electric vehicle according to the present invention;

[0027] Figure 8 This is a structural schematic diagram of the welding of the upper control arm support and the tie rod assembly mounting support of the rear subframe structure of the lightweight electric vehicle according to the present invention;

[0028] Figure 9 This is a schematic structural diagram of the support tube of the rear subframe structure of a lightweight electric vehicle according to the present invention;

[0029] Figure 10 This is a schematic diagram of the installation structure of the support tube of the rear subframe structure of the lightweight electric vehicle according to the present invention;

[0030] The markings in the attached figure are: 1—left front tie rod assembly mounting bracket; 2—left front tie rod assembly reinforcement support plate; 3—left rear upper control arm support; 4—front cross beam; 5—patch; 6—right rear upper control arm support; 7—right front tie rod assembly mounting bracket; 8—right longitudinal beam; 9—right support tube; 10—lower control arm connecting bracket; 11—rear cross beam; 12—left support tube; 13—left longitudinal beam. DETAILED DESCRIPTION

[0031] The following describes the embodiments with reference to the accompanying drawings to further explain in detail the specific embodiments of the present invention, such as the shapes, structures, mutual positions and connection relationships between the various components involved, the functions and working principles of the various components.

[0032] As attached Figure 1 -Attached Figure 10As shown, the present invention is a lightweight electric vehicle rear subframe structure, including a left front tie rod assembly mounting bracket 1, a left front tie rod assembly reinforcement support plate 2, a left rear upper control arm support 3, a front cross beam 4, a patch 5, a right rear upper control arm support 6, a right front tie rod assembly mounting bracket 7, a right longitudinal beam 8, a right support tube 9, a lower swing arm connecting bracket 10, a rear cross beam 11, a left support tube 12, and a left longitudinal beam 13. The left rear upper control arm support 3 is welded to the left longitudinal beam 13 and the front cross beam 4 through the left rear upper control arm support reinforcement folding edge I3-4 and the left rear upper control arm support reinforcement folding edge II3-8. The left front tie rod assembly mounting bracket is The inner plate reinforcement plate 3-3 is welded to the left front tie rod assembly mounting support outer plate 3-1 and the left longitudinal beam 13 on both sides of the left rear upper control arm support 3; the left front tie rod assembly mounting support 1 is welded to the left longitudinal beam 13 through the left front tie rod assembly mounting support inner plate reinforcement plate 3-3, the end of the left front tie rod assembly mounting support outer plate 3-1 is welded to the front crossbeam 4, and the left front tie rod assembly mounting support outer plate 3-1 is provided with a left front tie rod assembly mounting support reinforcement support 3-2, which is welded to the left front tie rod assembly mounting support outer plate 3-1 and the left longitudinal beam 13. The above structure proposes an improved technical solution. When setting up the structure, the upper control arm connecting support, the front tie rod assembly mounting support, and the lower swing arm connecting support are welded with high-strength aluminum alloy plates, which not only meets the rigidity performance but also effectively reduces the chassis weight. The upper control arm mounting brackets on either side of the subframe are welded to the left and right longitudinal beams and the front crossbeam, effectively increasing the rigidity of the subframe-suspension connection. Arc-shaped process holes (leakage holes) are provided at the welds between the upper control arm mounting brackets and the longitudinal beams, effectively simplifying the welding process, relieving concentrated stress, and improving fatigue durability. The lower control arm mounting brackets are welded separately to either side of the rear crossbeam and cast from high-strength aluminum alloy. Compared to traditional integrated mounting brackets, the built-in support plate is lighter in weight, ensuring the overall rigidity of the rear subframe while effectively improving NVH performance and vehicle modal frequency, avoiding resonance issues. Support tubes are installed at both ends of the rear subframe's longitudinal crossmember. These are welded to the rear crossmember and both longitudinal members, forming a triangular structure. The welds between the support tubes and the longitudinal members are located opposite the welds between the upper control arm support and the longitudinal member, and the tie rod assembly support and the longitudinal member. A straight line runs from the weld between the support tubes and the rear crossmember, through the welds between the support tubes and the longitudinal member, to the connection points between the upper control arm support and the upper control arm, and between the tie rod assembly support and the tie rod assembly. Each of these connection points is projected onto the extension of the support tubes, forming a straight line that runs through the longitudinal member. This arrangement of left and right support tubes effectively improves the overall stiffness, torsional rigidity, and crash safety of the rear subframe.The lightweight electric vehicle rear subframe structure described in the present invention has a simple structure, which not only meets the rigidity and strength performance, but also effectively reduces the chassis weight, reduces the difficulty of the welding process, releases concentrated stress, and improves fatigue durability. While meeting the rigidity and strength performance of the entire rear subframe, it effectively improves the vehicle's NVH performance and the vehicle's modal frequency, avoids resonance problems, and enhances the overall performance of the electric vehicle.

[0033] The lightweight electric vehicle rear subframe structure described in the present invention has the following technical advantages: 1. High reliability of high-strength aluminum alloy. The rear subframe is made of high-strength aluminum alloy castings, which effectively reduces the overall mass of the pure electric vehicle chassis. At the same time, it has the advantages of low density, high specific strength, anti-oxidation and corrosion resistance compared to traditional steel. Due to the reduced mass of the rear subframe, its low-order modal frequency is significantly different from the excitation frequency of the drive motor, which avoids the resonance problem, reduces the fatigue risk of the rear subframe, and improves the smoothness and safety of the entire vehicle. 2. High collision safety. The support tube welded on the inner side of the rear subframe is arranged in a straight line with the upper control arm connection support and the tie rod assembly support. When the entire vehicle collides, the concentrated load at the longitudinal and transverse beam welds is dispersed to the rear crossbeam by the left and right support tubes, which can effectively attenuate the impact load generated by the collision, ensure that the chassis structure does not undergo large collapse deformation and squeeze the power battery part, and is safer.

[0034] In the structure of the present invention, the front tie rod assembly mounting bracket includes a left front tie rod assembly mounting bracket and a right front tie rod assembly mounting bracket. The support tube includes a left support tube and a right support tube. The upper control arm support includes a left rear upper control arm support and a right rear upper control arm support. The front tie rod assembly mounting bracket includes a left front tie rod assembly mounting bracket and a right front tie rod assembly mounting bracket.

[0035] The right rear upper control arm support 6 is welded to the right longitudinal beam 8 and the front cross beam 4 through the right rear upper control arm support reinforcement folding edge Ⅰ and the right rear upper control arm support reinforcement folding edge Ⅱ, and the right front tie rod assembly mounting support inner plate reinforcement plate is welded to the right front tie rod assembly mounting support outer plate and the right longitudinal beam 8 on both sides of the right rear upper control arm support 6; the right front tie rod assembly mounting support 7 is welded to the right longitudinal beam 8 through the right front tie rod assembly mounting support inner plate reinforcement plate, and the end of the right front tie rod assembly mounting support outer plate is welded to the front cross beam 6, and a right front tie rod assembly mounting support reinforcement support is provided inside the right front tie rod assembly mounting support outer plate, and the right front tie rod assembly mounting support reinforcement support is welded to the right front tie rod assembly mounting support outer plate and the right longitudinal beam 8.

[0036] The left rear upper control arm support 3 includes an arc leakage hole 3-5, a left rear upper control arm support reinforcement folding edge I 3-4 welded to the front cross beam, a left rear upper control arm assembly hole 3-6, a left rear upper control arm support reinforcement plate 3-7, and a left rear upper control arm support reinforcement folding edge II 3-8 welded to the longitudinal beam; the right rear upper control arm support 6 includes an arc leakage hole, a right rear upper control arm support reinforcement folding edge I welded to the front cross beam, a right rear upper control arm assembly hole, a right rear upper control arm support reinforcement plate, and a right rear upper control arm support reinforcement folding edge II welded to the longitudinal beam.

[0037] The left front tie rod assembly mounting bracket 2 includes a front tie rod assembly assembly hole 2-1, a process groove 2-2, a left rear upper control arm support reinforcement plate 3-7, an arc leakage hole 2-4, a welding edge 2-5 with the front cross beam, and a welding edge 2-6 with the longitudinal beam; the right front tie rod assembly mounting bracket 7 includes a front tie rod assembly assembly hole, a process groove, a right rear upper control arm support reinforcement plate, an arc leakage hole, a welding edge with the front cross beam, and a welding edge with the longitudinal beam.

[0038] The left support tube 12 is welded to the rear cross member 11 and the left longitudinal member 13. The welding position of the left support tube 12 and the left longitudinal member 13 is located opposite the welding position of the left rear upper control arm support reinforcement fold I3-4 of the left rear upper control arm support 3 and the left longitudinal member 13, so that the left rear upper control arm support reinforcement fold II3-8 of the left rear upper control arm support 3 is located on the extension line of the left support tube 12. The welding position of the left support tube 12 and the left longitudinal member 13 is also located opposite the welding position of the left front tie rod assembly mounting support reinforcement fold I1-3 of the left front tie rod assembly mounting support 1 and the left longitudinal member 1, so that the left front tie rod assembly mounting support reinforcement fold II1-4 of the left front tie rod assembly mounting support 1 is located on the extension line of the left support tube 12. In the above structure, the reinforcement plates of the left front tie rod assembly mounting bracket 4 and the left rear upper control arm mounting bracket 3 are both located on the opposite side of the weld between the left support tube 3 and the left longitudinal beam 13. When the rear subframe is involved in a collision, the forward load from the left front tie rod assembly mounting bracket 1 and the left rear upper control arm mounting bracket 3 is distributed through two paths: first, through each mounting bracket via the longitudinal beam to the rear cross member; second, through the left front tie rod assembly mounting bracket 1 and the left rear upper control arm mounting bracket 3 via the support tube to the rear cross member 11. This structure distributes the impact load during a collision across various structural components, effectively improving the overall rigidity of the subframe and preventing excessive localized loads on individual components, which could lead to component failure.

[0039] The right support tube 9 is welded to the rear cross member 11 and the right longitudinal member 8, and the welding position of the right support tube 9 and the right longitudinal member 8 is located on the opposite side of the welding position of the right rear upper control arm support reinforcement fold I of the right rear upper control arm support 6 and the right longitudinal member 8, so that the right rear upper control arm support reinforcement fold II of the right rear upper control arm support 6 is located on the extension line of the right support tube 9. The welding position of the right support tube 9 and the right longitudinal member 8 is also located on the opposite side of the welding position of the right front tie rod assembly mounting support reinforcement fold I of the right front tie rod assembly mounting support 7 and the right longitudinal member 8, so that the right front tie rod assembly mounting support reinforcement fold II of the right front tie rod assembly mounting support 7 is located on the extension line of the right support tube 9. In the above structure, the reinforcement plates of the right front tie rod assembly mounting bracket 7 and the right rear upper control arm mounting bracket 6 are located on the opposite side of the weld between the right support tube 9 and the right longitudinal beam 8. When the rear subframe is involved in a collision, the forward load from the right front tie rod assembly mounting bracket 7 and the right rear upper control arm mounting bracket 6 is distributed into two paths: first, through the right front tie rod assembly mounting bracket 7 and the right rear upper control arm mounting bracket 6 via the longitudinal beam to the rear cross member; second, through the right front tie rod assembly mounting bracket 7 and the right rear upper control arm mounting bracket 6 via the support tube to the rear cross member. This structure distributes the impact load during a collision across various structural components, effectively improving the overall rigidity of the subframe and preventing excessive localized loads on individual components, which could lead to component failure.

[0040] The lower arm connecting support 10 is welded to the rear cross beam 11 , and the lower arm connecting support reinforcement plate 10 - 4 is arranged inside the lower arm connecting support 10 , and the lower arm connecting support reinforcement plate 10 - 4 connects the lower arm connecting support 10 and the rear cross beam 11 .

[0041] The lower arm connecting support 10 includes a left lower arm connecting support 10-5 and a right lower arm connecting support 10-6. Each lower arm connecting support 10 includes a lower arm assembly hole 10-1, a welding edge 10-2 with the rear cross beam, and a process hole 10-3.

[0042] The lightweight electric vehicle rear subframe structure described in this invention addresses the issues of optimizing the connection layout of existing pure electric vehicle chassis suspension control arms, lower control arms, and other components, lightweighting chassis structural components, and optimizing the fatigue durability of rear subframe components. The structure proposes a high-strength aluminum alloy plate connecting support welded integrally to the rear subframe longitudinal and transverse beams, and a split lower control arm support welded to the rear subframe crossbeams. High-strength aluminum alloy materials offer lightweight, high specific strength, oxidation and corrosion resistance, and a variety of molding processes. They are suitable for rear subframes with complex structural features and variable loads. This effectively reduces vehicle weight and improves handling stability and ride comfort.

[0043] The lightweight electric vehicle rear subframe structure described in this invention consists of an aluminum alloy rear upper control arm support, a split aluminum alloy lower arm connecting support, an aluminum alloy front tie rod assembly mounting support, and aluminum alloy longitudinal and transverse beams. The longitudinal and transverse beams of the rear subframe are welded together in a U-shaped configuration. The left and right rear upper control arm supports are welded to the front transverse beam and the longitudinal beams on either side, respectively. The left and right front tie rod assembly mounting supports are welded to the front transverse beam and the longitudinal beams on either side, respectively. The split lower transverse arm support is welded to both sides of the rear transverse beam. Support tubes are welded between the rear transverse beam and the longitudinal beams on either side, enhancing the overall bending and torsional rigidity of the rear subframe.

[0044] The lightweight electric vehicle rear subframe structure described in the present invention is designed such that the upper control arm connecting support, the front pull rod assembly mounting support, and the lower swing arm connecting support are welded with high-strength aluminum alloy plates during structural setting, which not only meets the rigidity performance but also effectively reduces the chassis weight. The upper control arm connecting supports on both sides of the subframe are welded to the longitudinal beams (left longitudinal beam and right longitudinal beam) on both sides of the subframe and the front crossbeam, which can effectively improve the connection rigidity between the subframe and the suspension; arc-shaped process holes (leakage holes) are provided at the welds between the upper control arm connecting support and the longitudinal beams, which can effectively reduce the difficulty of the welding process, release concentrated stress, and improve fatigue durability. The lower swing arm connecting support is welded in a split manner on both sides of the rear crossbeam and is cast with high-strength aluminum alloy plates. The built-in support plate is lighter in weight than the traditional integrated support. While meeting the overall rigidity performance of the rear subframe, it can effectively improve the NVH performance and the modal frequency of the entire vehicle and avoid resonance problems. Support tubes are installed at both ends of the rear subframe's longitudinal crossmember. These are welded to the rear crossmember and both longitudinal members, forming a triangular structure. The welds between the support tubes and the longitudinal members are located opposite the welds between the upper control arm support and the longitudinal member, and the tie rod assembly support and the longitudinal member. A straight line runs from the weld between the support tubes and the rear crossmember, through the welds between the support tubes and the longitudinal member, to the connection points between the upper control arm support and the upper control arm, and between the tie rod assembly support and the tie rod assembly. Each of these connection points is projected onto the extension of the support tubes, forming a straight line that runs through the longitudinal member. This arrangement of left and right support tubes effectively improves the overall stiffness, torsional rigidity, and crash safety of the rear subframe.

[0045] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the scope of protection of the present invention.

Claims

1. A lightweight electric vehicle rear subframe structure, characterized by: The invention comprises a left front tie rod assembly mounting bracket (1), a left front tie rod assembly reinforcement support plate (2), a left rear upper control arm bracket (3), a front cross beam (4), a patch (5), a right rear upper control arm bracket (6), a right front tie rod assembly mounting bracket (7), a right longitudinal beam (8), a right support tube (9), a lower swing arm connecting bracket (10), a rear cross beam (11), a left support tube (12), a left longitudinal beam (13), the left rear upper control arm bracket (3) is welded with the left longitudinal beam (13) and the front cross beam (4) through the left rear upper control arm bracket reinforcement folding edge I (3-4) and the left rear upper control arm bracket reinforcement folding edge II (3-8), and the left front tie rod assembly mounting bracket inner plate reinforcement plate is welded with the left rear upper control arm bracket reinforcement folding edge I (3-4) and the left rear upper control arm bracket reinforcement folding edge II (3-8). The left front tie rod assembly mounting support body (3-3) is welded to the left front tie rod assembly mounting support outer plate body (3-1) and the left longitudinal beam (13) on both sides of the left rear upper control arm support (3); the left front tie rod assembly mounting support (1) is welded to the left longitudinal beam (13) through the left front tie rod assembly mounting support inner plate body reinforcement plate body (3-3), the end of the left front tie rod assembly mounting support outer plate body (3-1) is welded to the front cross beam (4), the left front tie rod assembly mounting support outer plate body (3-1) is provided with a left front tie rod assembly mounting support reinforcement support (3-2), and the left front tie rod assembly mounting support reinforcement support (3-2) is welded to the left front tie rod assembly mounting support outer plate body (3-1) and the left longitudinal beam (13); The right rear upper control arm support (6) is welded to the right longitudinal beam (8) and the front cross beam (4) through the right rear upper control arm support reinforcement folding edge I and the right rear upper control arm support reinforcement folding edge II, and the right front tie rod assembly mounting support inner plate reinforcement plate is welded to the right front tie rod assembly mounting support outer plate and the right longitudinal beam (8) on both sides of the right rear upper control arm support (6); the right front tie rod assembly mounting support (7) is welded to the right longitudinal beam (8) through the right front tie rod assembly mounting support inner plate reinforcement plate, the end of the right front tie rod assembly mounting support outer plate is welded to the front cross beam (6), a right front tie rod assembly mounting support reinforcement support is provided inside the right front tie rod assembly mounting support outer plate, and the right front tie rod assembly mounting support reinforcement support is welded to the right front tie rod assembly mounting support outer plate and the right longitudinal beam (8); The left rear upper control arm support (3) includes an arc leakage hole (3-5), a left rear upper control arm support reinforcement folding edge I (3-4) welded to the front cross beam, a left rear upper control arm assembly hole (3-6), a left rear upper control arm support reinforcement plate (3-7), and a left rear upper control arm support reinforcement folding edge II (3-8) welded to the longitudinal beam; the right rear upper control arm support (6) includes an arc leakage hole, a right rear upper control arm support reinforcement folding edge I welded to the front cross beam, a right rear upper control arm assembly hole, a right rear upper control arm support reinforcement plate, and a right rear upper control arm support reinforcement folding edge II welded to the longitudinal beam; The left front tie rod assembly mounting bracket (2) comprises a front tie rod assembly assembly hole (2-1), a process groove (2-2), a left rear upper control arm support reinforcement plate (3-7), an arc leakage hole (2-4), a welding edge with the front cross beam (2-5), and a longitudinal beam welding edge (2-6); the right front tie rod assembly mounting bracket (7) comprises a front tie rod assembly assembly hole, a process groove, a right rear upper control arm support reinforcement plate, an arc leakage hole, a welding edge with the front cross beam, and a longitudinal beam welding edge.

2. The lightweight electric vehicle rear subframe structure according to claim 1, characterized in that: The left support tube (12) is welded to the rear cross beam (11) and the left longitudinal beam (13), and the welding position of the left support tube (12) and the left longitudinal beam (13) is located on the opposite side of the welding position of the left rear upper control arm support reinforcement folding edge I (3-4) of the left rear upper control arm support (3) and the left longitudinal beam (13), so that the left rear upper control arm support reinforcement folding edge II (3-8) of the left rear upper control arm support (3) is located on the extension line of the left support tube (12).

3. The lightweight electric vehicle rear subframe structure according to claim 2, characterized in that: The welding position of the left support tube (12) and the left longitudinal beam (13) is simultaneously located on the opposite side of the welding position of the left front tie rod assembly mounting support reinforcement folding edge I (1-3) of the left front tie rod assembly mounting support (1) and the left longitudinal beam (1), so that the left front tie rod assembly mounting support reinforcement folding edge II (1-4) of the left front tie rod assembly mounting support (1) is located on the extension line of the left support tube (12).

4. The lightweight electric vehicle rear subframe structure according to claim 2 or 3, characterized in that: The right support tube (9) is welded to the rear cross beam (11) and the right longitudinal beam (8), and the welding position of the right support tube (9) and the right longitudinal beam (8) is located on the opposite side of the welding position of the right rear upper control arm support reinforcement folding edge I of the right rear upper control arm support (6) and the right longitudinal beam (8), so that the right rear upper control arm support reinforcement folding edge II of the right rear upper control arm support (6) is located on the extension line of the right support tube (9).

5. The lightweight electric vehicle rear subframe structure according to claim 1 or 2, characterized in that: The welding position of the right support tube (9) and the right longitudinal beam (8) is simultaneously located on the opposite side of the welding position of the right front tie rod assembly mounting support reinforcement folding edge I of the right front tie rod assembly mounting support (7) and the right longitudinal beam (8), so that the right front tie rod assembly mounting support reinforcement folding edge II of the right front tie rod assembly mounting support (7) is located on the extension line of the right support tube (9).

6. The lightweight electric vehicle rear subframe structure according to claim 2 or 3, characterized in that: The lower swing arm connection support (10) is welded to the rear cross beam (11), the lower swing arm connection support reinforcement plate (10-4) is arranged inside the lower swing arm connection support (10), and the lower swing arm connection support reinforcement plate (10-4) connects the lower swing arm connection support (10) and the rear cross beam (11).

7. The lightweight electric vehicle rear subframe structure according to claim 2 or 3, characterized in that: The lower swing arm connecting support (10) comprises a left lower swing arm connecting support (10-5) and a right lower swing arm connecting support (10-6), and each lower swing arm connecting support (10) comprises a lower swing arm assembly hole (10-1), a welding edge with the rear cross beam (10-2), and a process hole (10-3).

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