Rear subframe assembly and vehicle

Abstract

The application provides a rear subframe assembly and a vehicle. The rear subframe assembly comprises a subframe and an electric drive assembly. The subframe comprises a front cross beam, a rear cross beam and two longitudinal beams. The front cross beam and the rear cross beam are longitudinally spaced and connected to the two longitudinal beams respectively to jointly define an electric drive accommodating space. At least part of each longitudinal beam is configured as an arch structure which arches upward and forms an avoiding space below the arch structure. The electric drive assembly is installed in the electric drive accommodating space and is connected to a drive shaft. The drive shaft extends from the avoiding space to outside the electric drive accommodating space. The rear subframe assembly of the application has the advantages that the arch structure of the longitudinal beam can improve the strength, the electric drive assembly is installed in the electric drive accommodating space, and the drive shaft extends to the avoiding space formed by the arch structure, so that the integration degree is high and space is saved.

Description

Rear subframe assembly and vehicle Technical Field

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

[0002] The vehicle subframe is not a complete frame; it is merely a support structure that holds the front and rear axles and suspension, allowing the axles and suspension to connect to the "main frame" through it. It is conventionally called the "subframe".

[0003] However, when other structures are installed at the rear subframe, the strength is poor, and the installation of other structures takes up space. Summary of the Invention

[0004] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a rear subframe assembly in which the arched structure of the longitudinal beams of the rear subframe assembly can improve strength, and the electric drive assembly is installed in the electric drive housing space, with the drive shaft extending to the clearance space formed by the arched structure, resulting in high integration and space saving.

[0005] According to an embodiment of the present invention, a rear subframe assembly includes: a subframe and an electric drive assembly; the subframe includes a front crossbeam, a rear crossbeam, and two frame longitudinal beams, the front crossbeam and the rear crossbeam are spaced apart along the longitudinal direction of the vehicle and are respectively connected between the two frame longitudinal beams to jointly define an electric drive housing space, at least a portion of each frame longitudinal beam is constructed as an arched structure, the arched structure arches upward and forms a clearance space below the arched structure; the electric drive assembly is mounted in the electric drive housing space, and the electric drive assembly is poweredly connected to a drive shaft, the drive shaft extending from the clearance space to outside the electric drive housing space.

[0006] According to an embodiment of the present invention, the rear subframe assembly has an arched longitudinal beam structure. The arched structure design has good stability and good buffering capacity, which can effectively absorb and disperse impact force. The arched structure can evenly transfer the gravity load to different positions, thereby enabling the entire structure to withstand greater force and improving strength. Moreover, the bottom of the arched structure forms a clearance space. When the electric drive assembly is installed in the electric drive housing space, the drive shaft extends to the clearance space, resulting in higher integration of the entire structure and saving space while ensuring strength.

[0007] According to an embodiment of the present invention, the rear subframe assembly is electrically connected to two drive shafts, both of which extend laterally along the vehicle and are respectively disposed in the clearance space of the two frame longitudinal beams.

[0008] According to an embodiment of the present invention, in the rear subframe assembly, the front crossbeam is provided with a front electric drive mounting point, each of the frame longitudinal beams is provided with a rear electric drive mounting point, the arched structure is located between the rear electric drive mounting point and the front crossbeam, and the front electric drive mounting point and the rear electric drive mounting points of the two frame longitudinal beams are all used to mount the electric drive assembly.

[0009] According to an embodiment of the present invention, in the rear subframe assembly, the rear electric drive mount points of the two frame longitudinal beams are directly opposite each other along the vehicle's transverse direction, and the front electric drive mount points and the rear electric drive mount points of the two frame longitudinal beams are distributed in an isosceles triangle.

[0010] According to an embodiment of the present invention, in the rear subframe assembly, the distance between the rear electric drive mount point and the rear crossbeam is less than the distance between the rear electric drive mount point and the front crossbeam.

[0011] According to an embodiment of the present invention, in the rear subframe assembly, the distance between the top of the drive shaft and the inner top wall of the clearance space is L1, and satisfies: 10mm≤L1≤15mm.

[0012] According to an embodiment of the present invention, the rear subframe assembly has a front body mounting portion at the front end of the longitudinal beam and a rear body mounting portion at the rear end of the longitudinal beam; the distance between the center of the drive shaft and the front body mounting portion is L2, and satisfies: 310mm≤L2≤330mm; the distance between the center of the drive shaft and the rear body mounting portion is L3, and satisfies: 460mm≤L3≤480mm.

[0013] According to an embodiment of the present invention, in the rear subframe assembly, the arched structure is located between the front body mounting portion and the middle portion of the frame longitudinal beam, and the bottom surface of both the front body mounting portion and the bottom surface of the middle portion of the frame longitudinal beam are lower than the bottom surface of the rear end of the rear body mounting portion.

[0014] According to an embodiment of the present invention, the height difference L4 between the front body mounting portion and the rear body mounting portion is such that 100mm≤L4≤120mm; and / or the distance between the front body mounting portion and the rear body mounting portion is d1, and satisfies 780mm≤d1≤800mm.

[0015] According to an embodiment of the present invention, in the rear subframe assembly, the inner wall surface of the clearance space includes a front wall surface and a rear wall surface, the front wall surface and the rear wall surface being connected to the inner vertex of the clearance space; wherein, the extension length of the front wall surface is greater than the extension length of the rear wall surface.

[0016] According to an embodiment of the present invention, in the rear subframe assembly, both the front wall surface and the rear wall surface are constructed as curved surfaces, and the radius of curvature of the front wall surface is greater than the radius of curvature of the rear wall surface.

[0017] According to an embodiment of the present invention, in the rear subframe assembly, the distance between the top tangent of the drive shaft connecting the front wall surface and the rear wall surface is L5, and satisfies: 130mm≤L5≤150mm.

[0018] According to an embodiment of the present invention, the rear subframe assembly includes an electric drive assembly comprising a drive motor and a reducer. The drive motor transmits power to the drive shaft via the reducer. The electric drive housing includes a front housing and a rear housing. The front housing is connected to the front side of the rear housing and is formed between the front sections of the longitudinal beams of the two frame longitudinal beams. The rear housing is formed between the rear sections of the longitudinal beams of the two frame longitudinal beams. The front housing is used to house the reducer and the drive shaft. The clearance space is connected to the front housing and the rear housing is used to house the drive motor.

[0019] According to an embodiment of the present invention, in the rear subframe assembly, the frame longitudinal beam has a front upper arm mounting portion at the upper front end of the arched structure and a front lower arm mounting portion at the lower front end, the front lower arm mounting portion being located in front of the front upper arm mounting portion, the frame longitudinal beam has a rear upper arm mounting portion at the upper rear end and a rear lower arm mounting portion at the lower rear end, the rear lower arm mounting portion being located in front of the rear upper arm mounting portion.

[0020] According to an embodiment of the present invention, the rear subframe assembly further includes a rear lower arm mounting bracket, the rear lower arm mounting bracket being located at the bottom of the frame longitudinal beam, the rear lower arm mounting bracket including front and rear arranged plates and a reinforcing plate located between the two plates, and the rear lower arm mounting portion being disposed on the two plates.

[0021] According to an embodiment of the present invention, the rear subframe assembly further includes a rear suspension toe bar mounting portion at the lower rear end of the frame longitudinal beam. The rear suspension toe bar mounting portion is located on the rear side of the rear lower arm mounting portion. The rear suspension toe bar mounting portion is used to mount one end of the rear suspension toe bar, and the other end of the rear suspension toe bar is adapted to be connected to the steering knuckle.

[0022] According to an embodiment of the present invention, the rear subframe assembly further includes a toe-in adjustment clearance hole extending in the longitudinal direction, the toe-in adjustment clearance hole being used to avoid adjustment tools for adjusting the rear suspension toe-in rod.

[0023] According to an embodiment of the present invention, the rear subframe assembly includes an inner plate portion and an outer plate portion. Both the inner plate portion and the outer plate portion are constructed as grooves. The inner plate portion and the outer plate portion are fastened and press-fitted together. A portion of the inner plate portion and a portion of the outer plate portion together form the arched structure.

[0024] According to an embodiment of the present invention, in the rear subframe assembly, the height difference between the highest point of the clearance space and the lowest point of the front end of the frame longitudinal beam is L6, and satisfies: 125mm≤L6≤145mm; and / or, the height of the arched structure along the vertical direction of the vehicle is H1, and satisfies: 70mm≤H1≤80mm.

[0025] According to an embodiment of the present invention, in the rear subframe assembly, the cross-sectional height of the frame longitudinal beam at the arched structure is less than the cross-sectional height at the rear side of the arched structure.

[0026] According to an embodiment of the present invention, in the rear subframe assembly, one end of the rear crossbeam is further provided with a clearance notch, which is adapted to pass through in the front-rear direction and is used to avoid the exhaust pipe of the engine.

[0027] According to an embodiment of the present invention, the rear crossbeam of the rear subframe assembly is integrally formed.

[0028] The present invention also proposes a vehicle including the aforementioned rear subframe assembly.

[0029] The advantages of the vehicle described above compared to existing technologies are the same as those of the rear subframe assembly described above compared to existing technologies, and will not be elaborated here.

[0030] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0031] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0032] Figure 1 is a top view of the rear subframe assembly according to an embodiment of the present invention;

[0033] Figure 2 is a schematic diagram of the subframe structure according to an embodiment of the present invention;

[0034] Figure 3 is a schematic diagram of the subframe structure according to an embodiment of the present invention;

[0035] Figure 4 is a top view of the subframe according to an embodiment of the present invention;

[0036] Figure 5 is a schematic diagram of the arched structure of the subframe according to an embodiment of the present invention;

[0037] Figure 6 is a schematic diagram of the arched structure of the subframe according to an embodiment of the present invention.

[0038] Figure 7 is a schematic diagram of the arched structure of the subframe according to an embodiment of the present invention.

[0039] Figure label:

[0040] Rear subframe assembly 1000,

[0041] Subframe 100, electric drive assembly 101, drive shaft 102, front crossbeam 1, front electric drive mount point 11, rear crossbeam 2, toe-in adjustment clearance hole 21, clearance notch 22, frame longitudinal beam 3, inner panel 31, outer panel 32, rear electric drive mount point 33, front body mounting part 34, rear body mounting part 35, front upper arm mounting bracket 40, front upper arm mounting part 401, front lower arm mounting bracket 41, front lower arm mounting part 411, rear upper arm mounting bracket 42, rear upper arm mounting part 421, rear lower arm mounting bracket 43, plate 431, reinforcing plate 432, rear lower arm mounting part 433, arch structure 5, clearance space 51, front wall 52, rear wall 53, electric drive housing space 6, front housing space 61, rear housing space 62. Detailed Implementation

[0042] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0043] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0044] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0045] Unless otherwise specified, the front-back direction in this application refers to the longitudinal direction of the vehicle, i.e., the X direction; the left-right direction refers to the lateral direction of the vehicle, i.e., the Y direction; and the up-down direction refers to the vertical direction of the vehicle, i.e., the Z direction.

[0046] The rear subframe assembly 1000 according to an embodiment of the present invention is described below with reference to Figures 1-7. The arched structure 5 of the longitudinal beam 3 of the rear subframe assembly 1000 can improve strength, and the electric drive assembly 101 is installed in the electric drive housing space 6. The drive shaft 102 extends to the clearance space 51 formed by the arched structure 5, which has high integration and saves space.

[0047] As shown in Figures 1-7, a rear subframe assembly 1000 according to an embodiment of the present invention includes: a subframe 100 and an electric drive assembly 101.

[0048] The subframe 100 includes a front crossbeam 1, a rear crossbeam 2, and two frame longitudinal beams 3. The front crossbeam 1 and the rear crossbeam 2 are distributed longitudinally along the vehicle and are respectively connected between the two frame longitudinal beams 3 to jointly define the electric drive housing space 6. At least part of each frame longitudinal beam 3 is constructed as an arch structure 5, which arches upward and forms a clearance space 51 below the arch structure 5. The electric drive assembly 101 is installed in the electric drive housing space 6 and is poweredly connected to a drive shaft 102. The drive shaft 102 passes through the clearance space 51 to the outside of the electric drive housing space 6.

[0049] In practice, the subframe 100 is a frame structure formed by the front crossbeam 1, the rear crossbeam 2, and two frame longitudinal beams 3. The subframe 100 is installed as a whole under the rear of the vehicle. At least part of the two frame longitudinal beams 3 of the subframe 100 are arched structures 5. For example, in the embodiment of the present invention, the arched structure 5 can be partially set at the front of the frame longitudinal beam 3. The frame longitudinal beam 3 with the arched structure 5 has good stability and good buffering capacity, and can effectively absorb and disperse impact force. The arched structure 5 can evenly transfer the gravity load to different positions, so that the entire structure can withstand greater force and improve strength.

[0050] The electric drive housing space 6 is defined between the two frame longitudinal beams 3 and the front crossbeam 1 and the rear crossbeam 2. The electric drive housing space 6 can be equipped with an electric drive assembly 101. The electric drive assembly 101 is connected to the wheels via the drive shaft 102, that is, it outputs power to the wheels.

[0051] Furthermore, the bottom of the arched structure 5 forms a clearance space 51. When the electric drive assembly 101 is installed in the electric drive housing space 6, the electric drive assembly 101 shares a portion of the height space with the front crossbeam 1 and the rear crossbeam 2 along the vehicle's height direction. This ensures the installation of the electric drive assembly 101 while saving space in the vehicle's height direction. In addition, the drive shaft 102 extends to the clearance space 51, resulting in a higher degree of integration of the entire structure, saving space while ensuring strength.

[0052] Furthermore, the clearance space 51 formed below the arched structure 5 can provide a certain enveloping space when the drive shaft 102 floats up and down or left and right, which not only reserves room for the drive shaft 102 to move, but also improves the strength of the frame longitudinal beam 3.

[0053] In some embodiments, the electric drive assembly 101 is powered by two drive shafts 102, both of which extend laterally along the vehicle and are respectively inserted through the clearance space 51 of the two frame longitudinal beams 3.

[0054] In practice, the electric drive assembly 101 outputs power to two drive shafts 102 connected at both ends. The two drive shafts 102 are connected to the two wheels on the lateral side of the vehicle. Each drive shaft 102 extends to the clearance space 51 at the bottom of the arched structure 5 of the corresponding frame longitudinal beam 3. The two drive shafts 102 can be driven simultaneously by one electric drive assembly 101, which has a higher degree of integration, saves space, and saves costs.

[0055] In some embodiments, the front crossbeam 1 is provided with a front electric drive mounting point 11, and each frame longitudinal beam 3 is provided with a rear electric drive mounting point 33. The arch structure 5 is located between the rear electric drive mounting point 33 and the front crossbeam 1. The front electric drive mounting point 11 and the rear electric drive mounting points 33 of the two frame longitudinal beams 3 are all used to install the electric drive assembly 101.

[0056] In other words, the rear sides of the electric drive assembly 101 along the vehicle's longitudinal direction are suitable for connection with the two rear electric drive mounting points 33. The connection on the side of the electric drive assembly 101 closer to the rear crossbeam 2 has better stability, while the side of the electric drive assembly 101 facing the front crossbeam 1 is suitable for connection with the front crossbeam 1 via the front electric drive mounting point 11, thereby reducing the connection complexity of the electric drive assembly 101. At the same time, the drive shaft 102, which is powered by the electric drive assembly 101, is located within the clearance space 51 formed at the bottom of the arched structure 5. This is equivalent to the drive shaft 102 being located between the line connecting the two rear electric drive mounting points 33 and the front crossbeam 1. At this time, the drive shaft 102 is basically in the middle position of the electric drive assembly 101 along the vehicle's longitudinal direction, thus ensuring force balance. Furthermore, the drive shaft 102 is powered by the wheels, and when the vehicle travels on different road sections, the drive shaft 102 can move within the clearance space 51 formed by the arched structure 5, leaving a buffer space.

[0057] In some embodiments, the rear electric drive mounting points 33 of the two frame longitudinal beams 3 are directly opposite each other along the vehicle's transverse direction, and the front electric drive mounting points 11 and the rear electric drive mounting points 33 of the two frame longitudinal beams 3 are distributed in an isosceles triangle.

[0058] In practice, the front electric drive mount point 11 is located at the middle of the front crossbeam 1 along the vehicle's transverse direction. At the same time, the rear electric drive mount points 33 of the two frame longitudinal beams 3 are directly opposite each other along the vehicle's transverse direction. Therefore, the distance between the front electric drive mount point 11 and the rear electric drive mount point 33 of one frame longitudinal beam 3 is equal to the distance between the front electric drive mount point 11 and the rear electric drive mount point 33 of the other frame longitudinal beam 3. Meanwhile, the center of mass of the electric drive assembly 101 is coplanar with the plane formed by the front electric drive mount point 11 and the rear electric drive mount points 33 of the two frame longitudinal beams 3. This avoids excessive swaying of the electric drive assembly 101 during operation and allows for more even force distribution when the electric drive assembly 101 is connected between the two frame longitudinal beams 3 and the front crossbeam 1.

[0059] In some embodiments, the distance between the rear electric drive mounting point 33 and the rear crossbeam 2 is less than the distance between the rear electric drive mounting point 33 and the front crossbeam 1.

[0060] That is, when the electric drive assembly 101 is installed between the front crossbeam 1, the rear crossbeam 2 and the frame longitudinal beam 3, there is a gap between the electric drive assembly 101 and the rear crossbeam 2. The center of gravity of the electric drive assembly 101 is biased towards the front side of the center of the subframe 100. The electric drive assembly 101 transmits power to the drive shaft 102. The front side of the subframe 100 is set with an arched structure 5, which means that the front structure is more stable and has a clearance space 51 to cooperate with the drive shaft 102. The arched structure 5 enhances the stability of the electric drive assembly 101. In addition, a motor controller and other components can be installed in the area between the rear electric drive mounting point 33 and the rear crossbeam 2 to achieve a reasonable spatial layout.

[0061] In some embodiments, the distance between the top of the drive shaft 102 and the inner top wall of the clearance space 51 is L1, and satisfies: 10mm≤L1≤15mm.

[0062] In practice, the main reason for the movement of the drive shaft 102 of the rear subframe 100 of the vehicle is to transmit power and torque. The main function of the drive shaft 102 is to transmit power to the wheels to propel the vehicle. When the electric drive assembly 101 is running, it drives the drive shaft 102 to move, thereby transmitting torque and power to the wheels. In other words, the drive shaft 102 must withstand the vibration and impact forces of the vehicle on the road surface.

[0063] When the vehicle travels on different road sections, the wheels are always floating. The floating of the wheels causes the drive shaft 102 to float up and down or back and forth with the wheels. For example, when the drive shaft 102 moves to the top of the clearance space 51 at the top of the arch structure 5, the distance between the top of the drive shaft 102 and the clearance space 51 is 12.67mm. In other words, by limiting the distance between the top of the drive shaft 102 and the inner top wall of the clearance space 51, it can be ensured that when the wheel moves to the top, the motion envelope of the drive shaft 102 and the arch structure 5 have sufficient motion clearance, thereby avoiding interference and collision between the drive shaft 102 and the arch structure 5 during movement, which would cause noise or limited movement.

[0064] In some embodiments, the front end of the frame longitudinal beam 3 is provided with a front body mounting part 34, and the rear end of the frame longitudinal beam 3 is provided with a rear body mounting part 35; the distance between the center of the drive shaft 102 and the front body mounting part 34 is L2, and satisfies: 310mm≤L2≤330mm, and the distance between the center of the drive shaft 102 and the rear body mounting part 35 is L3, and satisfies: 460mm≤L3≤480mm.

[0065] In practice, referring to Figure 6, the front ends of the two longitudinal beams 3 include two corresponding front body mounting parts 34, and the rear ends of the two longitudinal beams 3 include two corresponding rear body mounting parts 35. The rear subframe 100 is connected to the vehicle body through the front body mounting parts 34 and the rear body mounting parts 35. The distance between the center of the drive shaft 102 and the front body mounting part 34 can be 319mm, and the distance between the center of the drive shaft 102 and the rear body mounting part 35 can be 471mm. That is, the drive shaft 102 is generally biased towards the front side of the center of the rear subframe 100, and the front side of the electric drive assembly 101 is mounted at the front electric drive mounting point 11. The front side of the electric drive assembly 101 is more stable. By biasing the drive shaft 102 towards the front side of the center of the rear subframe 100, the stability of the drive shaft 102 under stress is improved.

[0066] In addition, the cross-sectional width of the arch structure 5 is designed to be uniform. For example, the width of the arch structure 5 can be set to 100mm along the front and rear direction of the vehicle. Of course, in practice, the width of the entire frame longitudinal beam 3 can also be set to 100mm from front to back to improve the strength and durability of the frame longitudinal beam 3.

[0067] In some embodiments, the arched structure 5 is located between the front body mounting portion 34 and the middle portion of the frame longitudinal beam 3, and the bottom surface of both the front body mounting portion 34 and the bottom surface of the middle portion of the frame longitudinal beam 3 are lower than the bottom surface of the rear end of the rear body mounting portion 35.

[0068] In other words, the rear side of the rear subframe 100 is closer to the horizontal state of the vehicle, while the front side is equipped with an arched structure 5. On the one hand, it can enhance the strength and stability of the front side, and on the other hand, it can avoid the drive shaft 102. The structure on the rear side, which is closer to the horizontal state of the vehicle, can better achieve the fit between the rear subframe 100 and the bottom of the vehicle.

[0069] Furthermore, the bottom surface of the front body mounting section 34 and the bottom surface of the middle part of the vehicle longitudinal beam are both lower than the rear body mounting section 35. In other words, the rear side of the vehicle's rear subframe 100 is generally higher, which is adapted to the structure of the vehicle's bottom rear side. The structure of the bottom rear side is higher than the height of the front side. The lower front side means that the center of gravity of the rear subframe 100 is closer to the ground than the rear side, which is conducive to improving stability. The higher rear side design helps to reduce wind resistance, reduce fuel consumption and noise.

[0070] In some embodiments, the height difference L4 between the front vehicle mounting portion 34 and the rear vehicle mounting portion 35 satisfies: 100mm≤L4≤120mm; and / or, the distance between the front vehicle mounting portion 34 and the rear vehicle mounting portion 35 is d1, which satisfies: 780mm≤d1≤800mm.

[0071] First, referring to Figure 5, by limiting the height difference between the front body mounting portion 34 and the rear body mounting portion 35, the rear subframe 100 avoids occupying too much space in the vehicle's height direction while meeting strength requirements and accommodating the electric drive assembly 101. This also allows for better adaptation to the rear lower structure of the vehicle while installing the electric drive assembly 101. For example, the distance between the front body mounting portion 34 and the rear body mounting portion 35 can be set to 108.5mm, resulting in more stable and rationally positioned cantilever components when installing them on the frame longitudinal beam 3, while the cantilever components connect to the steering knuckles of the wheels.

[0072] The distance between the front body mounting part 34 and the rear body mounting part 35 is d1, and satisfies: 780mm≤d1≤800mm, such as 791.155mm. By setting the distance between the front body mounting part 34 and the rear body mounting part 35, the length of the rear subframe 100 in the longitudinal direction of the vehicle can be limited. After the drive shaft 102 is connected to the wheel, a suitable gap can be left between the rear side of the rear subframe 100 and the exhaust system muffler located at the rear of the vehicle, and it will not be too close. When the gap between the rear side of the rear subframe 100 and the exhaust system muffler located at the rear of the vehicle is too close, the heat generated by the exhaust system muffler can affect the rubber sleeves of the rear body mounting part 35, thereby affecting the life of the rubber sleeves. That is, the rear subframe assembly 1000 of the present invention can improve the life of the rubber sleeves of the rear body mounting part 35 and improve the reliability of the installation between the rear subframe 100 and the vehicle body.

[0073] The main functions of the rubber sleeves installed between the rear subframe 100 and the vehicle body include isolating vibration and noise, improving the stiffness of the suspension connection, improving driving and riding comfort, and enhancing the torsional resistance of the vehicle body.

[0074] In some embodiments, the inner wall surface of the clearance space 51 includes a front wall surface 52 and a rear wall surface 53, which are connected to the inner apex of the clearance space 51; wherein the extension length of the front wall surface 52 is greater than the extension length of the rear wall surface 53.

[0075] As shown in Figure 3, the extension length of the front wall 52 of the clearance space 51 is greater than the extension length of the rear wall 53. In this case, the rear end of the arched structure 5 is higher than the front end, which allows the front wall 52 and rear wall 53 to limit the drive shaft 102 while also ensuring that the rear of the frame longitudinal beam 3 is positioned higher than the front, thereby reducing wind resistance at the rear of the vehicle. Furthermore, the greater extension length of the front wall 52 compared to the rear wall 53 makes the transition between the rear wall 53 of the arched structure 5 and the higher rear side of the frame longitudinal beam 3 smoother.

[0076] In some embodiments, both the front wall surface 52 and the rear wall surface 53 are constructed as curved surfaces, and the radius of curvature of the front wall surface 52 is greater than the radius of curvature of the rear wall surface 53.

[0077] First, by setting both the front wall surface 52 and the rear wall surface 53 as curved surfaces, the top of the clearance space 51 formed between the front wall surface 52 and the rear wall surface 53 can be an arc-shaped curved surface. Then, when the vehicle travels to different road sections, the drive shaft 102 can move back and forth or up and down, and the outer periphery of the drive shaft 102 can cooperate more smoothly with the curved front wall surface 52 and the rear wall surface 53, thereby improving the stability of the vehicle.

[0078] In some embodiments, the distance between the top tangent of the drive shaft 102 connecting the front wall surface 52 and the rear wall surface 53 is L5, and satisfies: 130mm≤L5≤150mm.

[0079] Referring to Figure 6, when the drive shaft 102 moves to its highest point, the distance between the tangent at the top of the drive shaft 102 and the distance connecting the front wall surface 52 and the rear wall surface 53 can be 136.903mm or 141mm. This ensures that the motion envelope of the drive shaft 102 and the arched structure 5 have sufficient motion clearance when the wheel moves, thus avoiding motion interference. At the same time, it meets the requirements of the stamping process and the left and right suspension arrangement requirements of the electric drive assembly 101.

[0080] In some embodiments, the electric drive assembly 101 includes a drive motor and a reducer. The drive motor transmits power to the drive shaft through the reducer. The electric drive housing 6 includes a front housing 61 and a rear housing 62. The front housing 61 is connected to the front side of the rear housing 62. The front housing 61 is formed between the front sections of the longitudinal beams of the two frame longitudinal beams 3, and the rear housing 62 is formed between the rear sections of the longitudinal beams of the two frame longitudinal beams 3. The front housing 61 is used to accommodate the reducer and the drive shaft 102. The clearance space 51 is connected to the front housing 61, and the rear housing 62 is used to accommodate the drive motor.

[0081] For example, the motor shaft of the drive motor is connected to the reducer, and the reducer is connected to the drive shaft 102. That is, the drive motor transmits power to the wheels through the reducer and drive shaft 102. Referring to Figures 4 and 1, the front accommodating space 61 is mainly opposite the arched structure 5 along the lateral direction of the vehicle. When the reducer is placed in the front accommodating space 61, the reducer and drive shaft 102 are connected, and the motor shaft of the drive motor is connected to the reducer. The drive motor and its controller are placed in the rear accommodating space 62, achieving a reasonable layout and improving the integration of the reducer and drive motor, etc., and enabling the drive shaft 102 to output power to the left and right wheels of the vehicle along the lateral direction. The drive motor controller can control the speed and torque of the drive motor. According to system requirements, the drive motor controller can control the motor speed by adjusting the input voltage or current, and control the motor torque by adjusting the amplitude, frequency, or phase of the input signal.

[0082] In some embodiments, the frame longitudinal beam 3 has a front upper arm mounting portion 401 at the upper front end of the arch structure 5 and a front lower arm mounting portion 411 at the lower front end, with the front lower arm mounting portion 411 located in front of the front upper arm mounting portion 401. The frame longitudinal beam 3 has a rear upper arm mounting portion 421 at the upper rear end and a rear lower arm mounting portion 433 at the lower rear end, with the rear lower arm mounting portion 433 located in front of the rear upper arm mounting portion 421.

[0083] As shown in Figures 3 and 6, a front upper arm can be movably mounted on the front upper arm mounting part 401, and a steering knuckle is mounted on the front upper arm. That is to say, this front upper arm connects the steering knuckle and the frame longitudinal beam 3 of the rear subframe 100, and plays a supporting and connecting role. The steering knuckle is responsible for connecting the wheel and the suspension system, ensuring that the wheel can steer smoothly, and bearing the force transmission between the wheel and the body.

[0084] The front lower arm mounting part 411 of the rear subframe 100 is movably connected to the front lower arm, and the front lower arm is connected to the steering knuckle. The front lower arm plays the role of connecting the wheel bearing and the suspension body in the automobile suspension system. Although it is small in size, it plays an important role in the vehicle. It works together with shock absorbers, springs and other components to play a key role in the stable support of the vehicle body.

[0085] The rear subframe 100 also features a rear upper arm mounting section 421, which movably connects to the rear upper arm. The rear upper arm is connected to the steering knuckle via a ball joint. The primary function of the connection between the rear upper arm and the steering knuckle of the rear subframe 100 is to transmit force and support the vehicle, ensuring stability and handling during driving. The rear lower arm connects to the rear lower arm mounting section 433 of the rear subframe 100. The connection between the rear lower arm and the steering knuckle serves to support the vehicle body and absorb shocks. It not only supports the vehicle's weight but also, through the cooperation of shock absorbers and springs, buffers vibrations during driving, improving ride comfort.

[0086] The front lower arm mounting portion 411 and the front upper arm mounting portion 401 are staggered along the vehicle's longitudinal direction on the frame longitudinal beam 3, thereby preventing stress concentration at the same position on the arched structure 5 and ensuring more even stress distribution. At the same time, the rear lower arm mounting portion 433 and the rear upper arm mounting portion 421 are also staggered along the vehicle's longitudinal direction on the frame longitudinal beam 3 to avoid interference during movement and to maintain a stable positional layout for the front lower arm, front upper arm, rear upper arm, and rear lower arm, thus improving the vehicle's driving stability.

[0087] In some embodiments, the rear subframe assembly 1000 further includes a rear lower arm mounting bracket 43, which is located at the bottom of the frame longitudinal beam 3. The rear lower arm mounting bracket 43 includes a front-to-back plate 431 and a reinforcing plate 432 located between the two plates 431. The rear lower arm mounting portion 433 is disposed on the two plates 431.

[0088] In practice, the rear subframe 100 is provided with a front upper arm mounting bracket 40, and a front upper arm mounting part 401 can be provided on the front upper arm mounting bracket 40. The rear subframe 100 is also provided with a front lower arm mounting bracket 41, and the front lower arm mounting bracket 41 is provided with a front lower arm mounting part 411. The rear subframe 100 is also provided with a rear upper arm mounting bracket 42, and the rear upper arm mounting bracket 42 is provided with a rear upper arm mounting part 421. Furthermore, a rear lower arm mounting bracket 43 is provided, and the rear lower arm mounting bracket 43 is provided with a rear lower arm mounting part 433. By setting the rear lower arm mounting bracket 43 as two oppositely arranged plates 431 and a reinforcing plate 432 connecting the two plates 431, the strength, durability, and stability of the rear lower arm mounting bracket 43 are improved.

[0089] Furthermore, the plate 431 and the reinforcing plate 432 can be welded together with the rear crossbeam 2 and the frame longitudinal beam 3, which improves the integrity of the rear lower arm mounting bracket 43 with the frame longitudinal beam 3 and the rear crossbeam 2, and improves the stability of the rear lower arm. The rear lower arm mounting part 433 can be a mounting hole, that is, the mounting hole is set in the two plates 431, and is connected to the rear lower arm by hinge or pivot through the mounting hole.

[0090] In some embodiments, the lower rear end of the longitudinal beam 3 of the vehicle frame is further provided with a rear suspension toe bar mounting part. The rear suspension toe bar mounting part is located on the rear side of the rear lower arm mounting part 433. The rear suspension toe bar mounting part is used to install one end of the rear suspension toe bar, and the other end of the rear suspension toe bar is adapted to be connected to the steering knuckle.

[0091] In practice, the rear suspension toe bar refers to a component in the rear suspension system used to adjust and control the wheel toe angle, ensuring vehicle stability and handling during driving. The rear suspension toe bar mounting part can be located at the connection between the rear crossbeam 2 and the frame longitudinal beam 3 (not shown in the figure), and it is connected to the steering knuckle. Alternatively, the rear suspension toe bar mounting part can be located at the rear of the rear lower arm mounting bracket 43 to improve the overall structural integration, while also being offset from the rear lower arm mounting part 433 on the rear lower arm mounting bracket 43 to avoid interference with the rear lower arm.

[0092] In some embodiments, the rear crossbeam 2 is further provided with a toe-in adjustment clearance hole 21 that runs through the front-rear direction. The toe-in adjustment clearance hole 21 is used to avoid the adjustment tool for adjusting the rear suspension toe-in rod.

[0093] In practice, the main purpose of adjusting the rear suspension toe-in is to ensure vehicle stability, handling, and uniform tire wear. The adjustment of the rear suspension toe-in has a significant impact on vehicle performance. As shown in Figure 6, the toe-in adjustment clearance hole 21 is positioned on the rear lower arm mounting bracket 43 near the rear crossbeam 2. This clearance hole facilitates easy adjustment of the rear suspension toe-in, offering high flexibility. A toe-in wrench is typically used for adjusting toe-in, usually for manually adjusting the wheel's toe-in value.

[0094] In some embodiments, the frame longitudinal beam 3 includes an inner plate portion 31 and an outer plate portion 32. Both the inner plate portion 31 and the outer plate portion 32 are constructed as grooves. The inner plate portion 31 and the outer plate portion 32 are fastened together and pressed together. A portion of the inner plate portion 31 and a portion of the outer plate portion 32 together form an arched structure 5.

[0095] In practice, the inner plate 31 and the outer plate 32 can be stamped together to improve the overall integrity of the frame longitudinal beam 3, which is suitable for parts with complex shapes. Stamping can manufacture complex parts with thin walls, light weight, high rigidity and high surface quality that are difficult to achieve by other methods, and is suitable for workpieces of various shapes and sizes. Furthermore, both the inner plate 31 and the outer plate 32 are constructed as grooves. After the grooved inner plate 31 and the outer plate 32 are stamped together, the interior of the frame longitudinal beam 3 becomes a hollow structure, which reduces the weight of the frame longitudinal beam 3 and achieves the effect of lightweighting.

[0096] Additionally, it should be noted that rubber sleeves are provided at both the front body mounting section 34 and the rear body mounting section 35. The upper end of the rubber sleeve, which is exposed outside the frame longitudinal beam 3, extends radially and is welded to the inner plate section 31 and the outer plate section 32 of the frame longitudinal beam 3. This improves the connection reliability of the rubber sleeve and ensures the integrity of the rubber sleeve and the frame longitudinal beam 3. The rubber sleeve connects the rear subframe 100 to the body, playing a role in buffering and shock absorption, reducing fatigue damage caused by frequent vibrations. The rubber sleeve can effectively suppress wheel vibration, improve the comfort of passengers inside the vehicle, and reduce the transmission of noise and vibration to the body, thereby improving the vehicle's NVH performance, which includes noise, vibration, and acoustic roughness.

[0097] In some embodiments, the height difference between the highest point of the clearance space 51 and the lowest point of the front end of the frame longitudinal beam 3 is L6, and satisfies: 125mm≤L6≤145mm; and / or, the height of the arch structure 5 along the vertical direction of the vehicle is H1, and satisfies: 70mm≤H1≤80mm.

[0098] Referring to Figure 5, in practice, the height difference between the highest point of the clearance space 51 and the lowest point of the front end of the frame longitudinal beam 3 can be set to 136.4 mm. The smaller the relative height, the simpler the structure, the lighter the weight, and the higher the load transfer efficiency. In other words, the relative height should not be too high, but the height difference design can meet the requirements of designing an arched structure 5. The arched structure 5 meets the motion profile of the drive shaft 102, and the design of the arched structure 5 can increase the strength of the frame longitudinal beam 3. The height of the arched structure 5 along the vertical direction of the vehicle is the cross-sectional height of the arched structure 5. For example, if the cross-sectional height of the arched structure 5 is 74.4 mm, the cross-sectional height affects the entire rear sub-mode, strength, and durability performance. By limiting the cross-sectional height, materials can be saved while ensuring the rear sub-mode, strength, and durability performance, so as to achieve a lightweight design.

[0099] Additionally, it should be noted that the height difference between the highest point of the bottom of the arched structure 5 and the middle section is L7, and L7 can be designed to be 82mm. This height difference is related to the positions of the rear lower arm, the rear suspension toe bar, and the rear upper arm at the mounting points of the frame longitudinal beam 3, as well as the height design of the rear end of the frame longitudinal beam 3 and the overlapping position of the rear crossbeam 2 and the arched structure 5. This allows for the use of a relatively simple frame longitudinal beam 3 structure while installing various structures, making it easier to set the above mounting points and positions, and meeting dynamic performance requirements.

[0100] In some embodiments, the cross-sectional height of the frame longitudinal beam 3 at the arched structure 5 is less than the cross-sectional height of the rear side of the arched structure 5.

[0101] Specifically, the middle section height of arch structure 5 is L9, which is 106.7 mm, and the rear section height is L8, which is 83 mm. Arch structure 5 exhibits relatively small bending moments under vertical loads, resulting in superior performance under such loads. Furthermore, the smooth inner contour of arch structure 5 allows for adjustments to the arch curvature to meet various application requirements, and its layout is more convenient than that of circular structures. Since arch structure 5 primarily bears compressive stress, materials with good compressive strength are suitable. The middle section height of arch structure 5 is smaller than that of its rear section, allowing for enhanced strength through structural design, thus reducing the amount of material used. Additionally, the higher rear section height of arch structure 5 meets strength requirements.

[0102] In some embodiments, one end of the rear crossbeam 2 is also provided with a clearance notch 22, which is adapted to pass through in the front-rear direction and is used to avoid the exhaust pipe of the engine.

[0103] As shown in Figure 2, the cross-sectional height of the rear crossbeam 2 above the clearance notch 22 is 170.2 mm, while the cross-sectional height of the rear crossbeam 2 outside the clearance notch 22 is 233.5 mm. The exhaust pipe of the rear subframe 100 is commonly referred to as the exhaust pipe or tailpipe. The exhaust pipe connects the engine at the front of the vehicle and the muffler at the rear, and is used to exhaust the exhaust gases produced by the engine. This design increases the integration between the exhaust pipe and the rear crossbeam 2, saving space. In addition, the clearance notch 22 can be designed with an arc-shaped structure, which better fits the outer perimeter of the exhaust pipe and reduces wear on the exhaust pipe.

[0104] In some embodiments, the rear crossbeam 2 is integrally formed. The integrally formed rear crossbeam 2 of the rear subframe 100 can improve the body strength and rigidity, reduce weight, improve overall vehicle comfort, and improve lateral and longitudinal rigidity. The width of the rear crossbeam 2 along the front-rear direction of the vehicle is D4, which is 69mm, and the height is 233.5mm.

[0105] Additionally, it should be noted that the rear subframe 100 has the rear luggage compartment floor directly above the longitudinal beam 3, and the lower plate of the rear longitudinal beam on the side above it. Furthermore, there is a gap between the area between the front body mounting part 34 and the rear body mounting part 35 of the longitudinal beam 3 and the lower plate of the rear longitudinal beam. The rear subframe 100 and the body are usually connected by a soft connection, which reduces the impact on the body when the rear subframe 100 vibrates.

[0106] This invention also proposes a vehicle including the aforementioned rear subframe assembly 1000. The arched structure 5 of the longitudinal beam 3 of the rear subframe assembly 1000 can improve strength, and the drive motor is installed in the electric drive housing space 6. The drive shaft 102 extends to the clearance space 51 formed by the arched structure 5. This design has high integration and saves space, saves space at the rear bottom of the vehicle, reduces material costs, and thus facilitates low-cost and lightweight design of the vehicle.

[0107] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0108] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A rear subframe assembly, characterized in that, include: The subframe includes a front crossbeam, a rear crossbeam, and two frame longitudinal beams. The front crossbeam and the rear crossbeam are spaced apart along the longitudinal direction of the vehicle and are respectively connected between the two frame longitudinal beams to jointly define an electric drive housing space. At least a portion of each frame longitudinal beam is constructed as an arched structure, which arches upward and forms a clearance space below the arched structure. An electric drive assembly is installed in the electric drive housing space and is poweredly connected to a drive shaft, which extends from the clearance space to the outside of the electric drive housing space. The front crossbeam has a front electric drive mounting point, and each of the frame longitudinal beams has a rear electric drive mounting point. The arched structure is located between the rear electric drive mounting points and the front crossbeam. The front electric drive mounting points and the rear electric drive mounting points of the two frame longitudinal beams are used to mount the electric drive assembly. The rear electric drive mounting points of the two frame longitudinal beams are directly opposite each other along the vehicle's transverse direction, and the front electric drive mounting points and the rear electric drive mounting points of the two frame longitudinal beams are distributed in an isosceles triangle. The center of mass of the electric drive assembly is coplanar with the plane formed by the front electric drive mounting points and the rear electric drive mounting points of the two frame longitudinal beams.

2. The rear subframe assembly according to claim 1, characterized in that, The electric drive assembly is powered by two drive shafts, both of which extend laterally along the vehicle and are respectively inserted into the clearance space of the two frame longitudinal beams.

3. The rear subframe assembly according to claim 1, characterized in that, The distance between the rear electric drive mounting point and the rear crossbeam is less than the distance between the rear electric drive mounting point and the front crossbeam.

4. The rear subframe assembly according to claim 1, characterized in that, The distance between the top of the drive shaft and the inner top wall of the clearance space is L1, and satisfies: 10mm≤L1≤15mm.

5. The rear subframe assembly according to claim 4, characterized in that, The front end of the longitudinal beam of the frame is provided with a front body mounting part, and the rear end of the longitudinal beam of the frame is provided with a rear body mounting part; the distance between the center of the drive shaft and the front body mounting part is L2, and satisfies: 310mm≤L2≤330mm; the distance between the center of the drive shaft and the rear body mounting part is L3, and satisfies: 460mm≤L3≤480mm.

6. The rear subframe assembly according to claim 5, characterized in that, The arched structure is located between the front body mounting part and the middle part of the frame longitudinal beam, and the bottom surface of the front body mounting part and the bottom surface of the middle part of the frame longitudinal beam are both lower than the bottom surface of the rear end of the rear body mounting part.

7. The rear subframe assembly according to claim 5, characterized in that, The height difference L4 between the front body mounting part and the rear body mounting part satisfies: 100mm≤L4≤120mm; and / or the distance between the front body mounting part and the rear body mounting part is d1, which satisfies: 780mm≤d1≤800mm.

8. The rear subframe assembly according to claim 1, characterized in that, The inner wall of the clearance space includes a front wall and a rear wall, which are connected to the inner apex of the clearance space; wherein the extension length of the front wall is greater than the extension length of the rear wall.

9. The rear subframe assembly according to claim 8, characterized in that, Both the front wall and the rear wall are constructed as curved surfaces, and the radius of curvature of the front wall is greater than that of the rear wall.

10. The rear subframe assembly according to claim 8, characterized in that, The distance between the top tangent of the drive shaft connecting the front wall and the rear wall is L5, and satisfies: 130mm≤L5≤150mm.

11. The rear subframe assembly according to claim 1, characterized in that, The electric drive assembly includes a drive motor and a reducer. The drive motor transmits power to the drive shaft through the reducer. The electric drive housing includes a front housing and a rear housing. The front housing is connected to the front side of the rear housing and is formed between the front sections of the two longitudinal beams of the frame. The rear housing is formed between the rear sections of the two longitudinal beams of the frame. The front housing is used to house the reducer and the drive shaft. The clearance space is connected to the front housing and the rear housing is used to house the drive motor.

12. The rear subframe assembly according to claim 1, characterized in that, The frame longitudinal beam has a front upper arm mounting part at the upper front end of the arched structure and a front lower arm mounting part at the lower front end. The front lower arm mounting part is located in front of the front upper arm mounting part. The frame longitudinal beam has a rear upper arm mounting part at the upper rear end and a rear lower arm mounting part at the lower rear end. The rear lower arm mounting part is located in front of the rear upper arm mounting part.

13. The rear subframe assembly according to claim 12, characterized in that, It also includes a rear lower arm mounting bracket, which is located at the bottom of the longitudinal beam of the vehicle frame. The rear lower arm mounting bracket includes plates arranged front and rear and a reinforcing plate located between the two plates. The rear lower arm mounting part is disposed on the two plates.

14. The rear subframe assembly according to claim 12, characterized in that, The lower rear end of the longitudinal beam of the vehicle frame is also provided with a rear suspension toe bar mounting part. The rear suspension toe bar mounting part is located on the rear side of the rear lower arm mounting part. The rear suspension toe bar mounting part is used to install one end of the rear suspension toe bar, and the other end of the rear suspension toe bar is adapted to be connected to the steering knuckle.

15. The rear subframe assembly according to claim 14, characterized in that, The rear crossbeam is also provided with a toe adjustment clearance hole that runs through the front-rear direction. The toe adjustment clearance hole is used to avoid the adjustment tool for adjusting the rear suspension toe rod.

16. The rear subframe assembly according to claim 1, characterized in that, The frame longitudinal beam includes an inner plate portion and an outer plate portion. Both the inner plate portion and the outer plate portion are constructed in a groove shape. The inner plate portion and the outer plate portion are fastened and pressed together. A portion of the inner plate portion and a portion of the outer plate portion together form the arched structure.

17. The rear subframe assembly according to claim 1, characterized in that, The height difference between the highest point of the clearance space and the lowest point of the front end of the longitudinal beam of the frame is L6, and satisfies: 125mm≤L6≤145mm; and / or, the height of the arch structure along the vertical direction of the vehicle is H1, and satisfies: 70mm≤H1≤80mm.

18. The rear subframe assembly according to claim 1, characterized in that, The cross-sectional height of the longitudinal beam of the frame at the arched structure is less than the cross-sectional height at the rear side of the arched structure.

19. The rear subframe assembly according to claim 1, characterized in that, One end of the rear crossbeam is also provided with a clearance notch, which is adapted to pass through in the front-rear direction and is used to avoid the exhaust pipe of the engine.

20. The rear subframe assembly according to claim 1, characterized in that, The rear crossbeam is constructed as a single piece.

21. A vehicle, characterized in that, Includes the rear subframe assembly as described in any one of claims 1-20.

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