Vehicle rear axle and vehicle

Abstract

The utility model relates to the technical field of vehicles, and discloses a vehicle rear axle and a vehicle, the vehicle rear axle comprises a rear floor, a rear suspension, a rear wheel steering gear, a rear electric drive assembly and a motor controller, the rear suspension is assembled below the rear floor and comprises a front cross beam and a rear cross beam which are oppositely arranged, and rear pull rods are arranged at the two ends of the rear suspension respectively; the rear pull rod is positioned between the front cross beam and the rear cross beam; two ends of the rear wheel steering gear are respectively connected with two rear pull rods; the rear electric drive assembly is assembled on the rear suspension and located behind a rear wheel steering gear, the rear electric drive assembly comprises a rear motor and a rear speed reducer, the rear motor and the rear speed reducer are arranged in the left-right direction of the vehicle, and a rotating shaft of the rear motor and an output shaft of the rear speed reducer are coaxially arranged; and the motor controller is fixedly arranged at the top of the rear electric drive assembly. According to the vehicle rear axle and the vehicle, the turning radius of the vehicle can be effectively reduced, the operation performance of the vehicle is improved, and the transverse and longitudinal space in the vehicle is enlarged.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a vehicle rear axle and a vehicle. Background Art

[0002] Existing electric vehicle rear axle architecture layout solutions mostly adopt parallel axis main rear drive + no rear wheel steering + cage body structure with C ring. The parallel axis main rear drive drive form occupies a large space in the longitudinal direction of the vehicle (vehicle length direction), and has a certain intrusion on the passenger space and storage space inside the vehicle;

[0003] Secondly, the existing rear axle chassis has no rear wheel steering assistance, and the rear wheels themselves cannot deflect at a certain angle, resulting in a large turning radius of the vehicle and poor vehicle handling performance. At the same time, in order to improve the rigidity of the vehicle body, the cage-type body structure with a C-ring needs to add a crossbeam near the front and rear crossbeams of the subframe or the shock absorber mounting point, which also occupies a certain amount of the vehicle's lateral (left and right directions) and longitudinal space, encroaching on the vehicle's needs for passenger and storage space.

[0004] In addition, the motor controller of existing electric vehicles is separated from the rear electric drive assembly. This structure will increase the installation space of the entire vehicle, thereby affecting the space inside the vehicle. Utility Model Content

[0005] In order to solve the above technical problems, the present application provides a vehicle rear axle and a vehicle, which reduce the turning radius of the vehicle, improve the vehicle's operating performance, and increase the lateral and longitudinal space inside the vehicle.

[0006] The technical solution adopted by this application to solve its technical problem is:

[0007] A vehicle rear axle, comprising:

[0008] rear floor;

[0009] A rear suspension, which is mounted below the rear floor and comprises a front crossbeam and a rear crossbeam which are arranged opposite to each other, and a rear tie rod is provided at each end of the rear suspension, and the rear tie rod is located between the front crossbeam and the rear crossbeam;

[0010] A rear wheel steering gear, wherein the rear wheel steering gear is disposed between the front cross beam and the rear cross beam, and two ends of the rear wheel steering gear are respectively connected to the two rear tie rods; and

[0011] A rear electric drive assembly, which is mounted on the rear suspension and is located behind the rear wheel steering gear;

[0012] The motor controller is fixedly arranged on the top of the rear electric drive assembly.

[0013] In some embodiments, the rear electric drive assembly includes a rear motor and a rear reducer, the rear motor and the rear reducer are arranged along the left and right directions of the vehicle, and the rotating shaft of the rear motor is coaxially arranged with the output shaft of the rear reducer.

[0014] In some embodiments, the rotating shaft of the rear motor is connected to the output shaft of the rear reducer via a transmission member, and a lubricating oil groove is provided on the outer wall of the rotating shaft of the motor or the output shaft of the rear reducer adjacent to the transmission member.

[0015] In some embodiments, the transmission member includes cooperating external splines and internal splines;

[0016] The external spline is arranged on the rotating shaft of the motor, and the internal spline is arranged on the output shaft of the rear reducer;

[0017] Alternatively, the inner spline is arranged on the rotating shaft of the electric motor, and the outer spline is arranged on the output shaft of the rear reducer.

[0018] In some embodiments, the rear suspension is an H-arm suspension, the front crossbeam and the rear crossbeam are arranged in the front-to-rear direction of the vehicle, and the rear electric drive assembly is disposed between the front crossbeam and the rear crossbeam.

[0019] In some embodiments, rear steering knuckles are respectively provided at both ends of the rear suspension, a middle portion of the rear steering knuckle is used to connect to a wheel, and one end of the rear steering knuckle is connected to the rear tie rod.

[0020] In some embodiments, the distance between the front end surface of the front cross beam and the rear end surface of the rear cross beam is d, 500mm≤d≤600mm.

[0021] In some embodiments, the rear floor is an integral die-cast structure.

[0022] In some embodiments, the dimension of the rear electric drive assembly along the front-to-rear direction of the vehicle is Y1, and the dimension along the height direction of the vehicle is Z1, 300mm≤Z1≤400mm, 250mm≤Y1≤310mm.

[0023] In some embodiments, the motor controller comprises:

[0024] A housing, fixedly mounted on the rear electric drive assembly;

[0025] A cooling water channel is arranged inside the shell and divides the shell into an upper cavity and a lower cavity that are connected;

[0026] A capacitor assembly is assembled in the upper cavity;

[0027] An IGBT module is assembled in the lower cavity and fits in with the cooling water channel;

[0028] A drive board, assembled in the lower cavity and electrically connected to the IGBT module;

[0029] A control board, mounted in the lower cavity and electrically connected to the drive board;

[0030] The shielding plate is arranged between the driving plate and the control plate.

[0031] A vehicle comprises the above-mentioned vehicle rear axle and rear wheels, wherein the rear wheels are mounted on the vehicle rear axle.

[0032] Compared with the prior art, the vehicle rear axle and vehicle of the embodiment of the present application have the following beneficial effects: by providing a rear wheel steering device, the rear wheels themselves can be deflected at a certain angle during driving, which can compensate for the defects of the vehicle steering mechanism caused by the tires, thereby reducing the turning radius of the vehicle and improving the vehicle's operating performance. By respectively arranging rear tie rods at both ends of the rear suspension and arranging the rear tie rods between the front crossbeam and the rear crossbeam of the rear suspension, and connecting the two ends of the rear wheel steering gear to the two rear tie rods respectively, and locating them in front of the rear electric drive assembly, that is, the rear wheel steering gear is front-mounted. Compared with the rear-mounted solution, the rear wheel steering gear utilizes the space of the rear tie rod structure at the front end of the rear electric drive assembly and does not need to occupy additional space outside the rear suspension, thereby reducing the longitudinal layout space of the vehicle; by adopting a coaxial rear electric drive assembly, compared with a non-coaxial rear electric drive, the rear motor and the rear reducer have a certain spacing in the front-to-rear direction of the vehicle, and the rear motor and the rear reducer of the coaxial rear electric drive assembly have no spacing in the front-to-rear direction of the vehicle, which can reduce the spatial position occupied by the rear electric drive assembly along the front-to-rear direction and height direction of the vehicle.

[0033] In addition, by fixing the motor controller on the top of the rear electric drive assembly, the motor controller and the rear electric drive assembly are integrated, thereby reducing the installation space of the vehicle and expanding the interior space of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic diagram of the structure of the vehicle of the present application.

[0035] Figure 2 This is a schematic diagram of the layout of the vehicle rear axle of this application.

[0036] Figure 3 This is a schematic structural diagram of the vehicle rear axle of the present application without a rear electric drive assembly.

[0037] Figure 4 This is a schematic structural diagram of the vehicle rear axle of the present application.

[0038] Figure 5 The figure is a schematic diagram of the layout of the existing vehicle rear axle.

[0039] Figure 6 This is a schematic diagram of an exploded view of the electric drive assembly of the vehicle of the present application.

[0040] Figure 7 This is a schematic diagram of the structure of the electric drive assembly of the vehicle of the present application.

[0041] Figure 8 This is a schematic diagram of the structure of the rotating shaft and the output shaft of the present application.

[0042] Fig. 9 This is an exploded diagram of the motor controller of the present application.

[0043] Among them: 1-rear floor, 2-rear suspension, 21-front crossbeam, 22-rear crossbeam, 3-rear wheel steering gear, 4-rear electric drive assembly, 41-rear motor, 411-rotating shaft, 4111-lubricating oil tank, 42-rear reducer, 421-output shaft, 43-spline, 431-external spline, 432-internal spline, 5-rear subframe, 6-rear shock absorber, 7-rear pull rod, 8-rear steering knuckle, 9-rear lower swing arm, 10-rear upper swing arm, 20-rear spring, 30-motor controller, 31-housing body, 32-upper cover, 33-capacitor assembly, 34-IGBT module, 35-drive board, 36-control board, 37-shielding plate, 38-sealing ring, 100-rear wheel; 200-vehicle rear axle. DETAILED DESCRIPTION

[0044] The specific implementation methods of the present application are further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present application but are not intended to limit the scope of the present application.

[0045] In the following description of this application, the terms "front" and "rear" are based on the azimuth relationship that the forward direction of the vehicle is the front and the backward direction of the vehicle is the rear. Figure 1 The Y direction is the front-to-back direction (longitudinal direction), the X direction is the left-to-right direction (lateral direction), and the Z direction is the height direction.

[0046] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0047] like Figure 1-4As shown, a vehicle according to a preferred embodiment of the present application includes a vehicle rear axle 200 and rear wheels 100, wherein the rear wheels 100 are mounted on the vehicle rear axle.

[0048] The vehicle rear axle 200 includes a rear floor 1, a rear suspension 2, a rear wheel steering gear 3, a rear electric drive assembly 4 and a motor controller 30. The rear floor 1 is an integrated die-cast structure. The rear suspension 2 is mounted below the rear floor 1. The rear suspension 2 includes a front cross beam 21 and a rear cross beam 22 that are arranged opposite to each other. Rear tie rods 7 are provided at both ends of the rear suspension 2. The rear tie rods 7 are located between the front cross beam 21 and the rear cross beam 22. The rear wheel steering gear 3 is disposed between the front cross beam 21 and the rear cross beam 22, and two rear tie rods 7 are connected at both ends thereof. The rear electric drive assembly 4 is mounted on the rear suspension 2 and is located behind the rear wheel steering gear 3. The rear electric drive assembly 4 includes a rear motor 41 and a rear reducer 42. The rear motor 41 and the rear reducer 42 are arranged along the left-right direction of the vehicle, and the rotating shaft 411 of the rear motor 41 is coaxially arranged with the output shaft 421 of the rear reducer 42. The rear motor 41 is used to provide power for the vehicle. The motor controller 30 is fixed on the top of the rear electric drive assembly 4 and integrated with the rear electric drive assembly 4, thereby reducing the installation space of the vehicle and expanding the interior space of the vehicle.

[0049] Based on the vehicle rear axle 200 and vehicle with the above characteristics, by setting the rear wheel steering device 3, the rear wheel 100 itself can also deflect to a certain angle during driving, which can compensate for the defects of the vehicle steering mechanism caused by the tire, thereby reducing the turning radius of the vehicle and improving the vehicle's operating performance. By respectively arranging rear tie rods 7 at both ends of the rear suspension 2, and arranging the rear tie rods 7 between the front cross beam 21 and the rear cross beam 22 of the rear suspension 2, and connecting the two ends of the rear wheel steering gear 3 to the two rear tie rods 7 respectively, and locating them in front of the rear electric drive assembly 4, that is, the rear wheel steering gear 3 adopts a front-mounted manner. Compared with the rear-mounted scheme, the rear wheel steering gear 3 utilizes the space of the rear tie rod 7 structure of the rear suspension 2 at the front end of the rear electric drive assembly 4, and does not need to occupy additional space outside the rear suspension 2, thereby reducing the longitudinal layout space of the vehicle; by adopting a coaxial rear electric drive assembly 4, compared with a non-coaxial rear electric drive, the motor and the reducer have a certain spacing in the front-to-back direction of the vehicle, and the rear motor 41 and the rear reducer 42 of the coaxial rear electric drive assembly 4 have no spacing in the front-to-back direction of the vehicle, which can reduce the spatial position occupied by the rear electric drive assembly 4 along the front-to-back direction and height direction of the vehicle. By configuring the rear floor 1 as an integral die-cast structure, there is no need to configure an additional crossbeam to increase the strength of the rear floor 1, thereby reducing the occupancy of the lateral and longitudinal space of the vehicle and increasing the lateral and longitudinal space in the vehicle.

[0050] Specifically, by placing the rear wheel steering gear 3 in front, compared with the rear-mounted solution, the space of the rear tie rod 7 structure of the rear electric drive front rear suspension 2 can be utilized to reduce the longitudinal layout space by about 105 mm. Figure 5 As shown, its length L is the increased longitudinal arrangement distance of the traditional vehicle rear axle compared to the arrangement of the present application.

[0051] With a coaxial electric drive, the motor output shaft is coaxial with the reducer output shaft. Compared with the traditional parallel shaft electric drive (the motor output shaft and the reducer output shaft are not coaxial), the longitudinal dimension can be reduced by about 150mm at the same power and torque. For example, in a specific embodiment, at the same power and torque, the longitudinal distance of the coaxial electric drive is 313mm, and the longitudinal distance of the parallel shaft electric drive is 460mm, a difference of 147mm.

[0052] By setting the rear floor 1 as an integral die-cast structure, compared with a conventional cage-type welded body with a C-ring:

[0053] Compared with the one-piece die-cast body floor, the traditional cage-type welded body structure with C-ring needs to add an extra crossbeam near the front and rear crossbeams of the subframe to improve the dynamic rigidity of the body. This will increase the longitudinal boundary of the body structure by about 50mm.

[0054] Compared with the one-piece die-cast body floor, the traditional cage-type welded body structure with C-ring needs to add an extra crossbeam (C-ring) near the shock absorber installation point to improve the body dynamic rigidity. This will increase the space of the lateral boundary of the body structure by about 30mm.

[0055] In some embodiments, the vehicle may be a bridge car, SUV, MPV or other vehicle. The vehicle may be a three-row seat vehicle. A three-row seat vehicle may be understood as a vehicle having six or seven seats, or may be understood as a vehicle having a front row seat, a middle seat and a rear row seat.

[0056] In some embodiments, the number of the front seats may be two, and both front seats may be independent seats.

[0057] In some embodiments, the number of the middle seats can be one to two. When the number of the middle seat is one, the middle seat can be an integrated two-seat seat or an integrated three-seat seat. When the number of the middle seats is two, both middle seats can be independent seats.

[0058] In some embodiments, the number of rear seats can be one to three. When the number of rear seats is one, the rear seat can be an integrated two-seat seat or an integrated three-seat seat. When the number of rear seats is two, both rear seats can be independent seats, or one rear seat is an independent seat and the other rear seat is an integrated two-seat seat. When the number of rear seats is three, all three rear seats can be independent seats.

[0059] In this embodiment, the rear suspension 2 is an H-arm suspension, including a front crossbeam 21 and a rear crossbeam 22 that are arranged opposite to each other, and the front crossbeam 21 and the rear crossbeam 22 are arranged in the front-rear direction of the vehicle, and the front crossbeam 21 is located in front of the rear crossbeam 22, and the rear wheel steering gear 3 and the rear electric drive assembly 4 are both arranged between the front crossbeam 21 and the rear crossbeam 22. The rear suspension 2 is provided with a rear steering knuckle 8 at both ends, the middle part of the rear steering knuckle 8 is used to connect the wheel 100, and one end of the rear steering knuckle 8 is connected to the rear tie rod 7. The rear steering knuckle 8 serves as a connecting piece between the rear wheel 100 and the rear wheel steering gear 3, so that the rear wheel steering gear 3 drives the rear wheel to achieve steering action.

[0060] Please refer to the attached Figure 3 , 4 Specifically, the vehicle rear axle may further include one or more structures such as a rear lower swing arm 9, a rear upper swing arm 10, a rear knuckle link, a rear stabilizer bar, a rear stabilizer bar link, a rear spring 20, and a rear shock absorber 6. Among them, the rear lower swing arm is respectively assembled with the rear suspension 2 and the rear knuckle 8. The rear upper swing arm is respectively assembled with the rear suspension 2 and the rear knuckle 8. The rear knuckle 8 is suitable for being assembled with the rear wheel 100. The rear wheel steering gear 3 is assembled with the rear knuckle 8. The rear knuckle link is respectively assembled with the rear knuckle 8 and the rear lower swing arm. The rear stabilizer bar is assembled with the rear suspension 2.

[0061] The rear lower swing arm 9 and the rear upper swing arm 10 are used to bear the lateral force, longitudinal force and vertical force of the vehicle. The rear lower swing arm 9 can be an H arm, which helps to reduce the number of transverse links, thereby helping to save the layout space of the rear axle of the vehicle, and also helps to provide more space for the front installation of the rear wheel steering gear 3 in the subsequent embodiments. The rear lower swing arm 9 can be a die-casting, for example, the rear lower swing arm can be an aluminum alloy die-casting, which helps to reduce the weight of the rear lower swing arm 9 and improve the strength of the rear lower swing arm. The rear lower swing arm 9 can be hinged to the longitudinal beam of the rear subframe 5 and the rear steering knuckle 8. The rear upper swing arm 10 can also be a die-casting, for example, the rear upper swing arm 10 can be an aluminum alloy die-casting, which helps to reduce the weight of the rear upper swing arm 10 and improve the strength of the rear upper swing arm. The rear upper swing arm 10 can be hinged to the longitudinal beam of the rear subframe 5 and the rear steering knuckle 8.

[0062] The rear spring 20 and the rear shock absorber 6 are used to improve the driving stability of the vehicle. The lower end of the rear spring 20 can be arranged on the rear lower swing arm 9, and the upper end of the rear spring 20 can be arranged on the body of the vehicle. The lower end of the rear shock absorber 6 can be arranged on the rear lower swing arm 9, and the upper end of the rear shock absorber 6 can be arranged on the body of the vehicle. The rear spring 20 can be an air spring or a coil spring. The rear spring 20 and the rear shock absorber 6 can be a split structure, which helps to shorten the stroke of the rear shock absorber 6 compared to the structure in which the rear spring 20 and the rear shock absorber 6 are integrated, thereby helping to reduce the space occupied by the rear shock absorber 6 along the height direction z of the vehicle.

[0063] The above structures can be hinged by means of ball heads, rubber bushings or other structures.

[0064] In some embodiments, the rear wheel steering device 3 is configured to make the maximum steering angle of the rear wheel 100 α. α can be greater than or equal to 3.5 degrees and less than or equal to 7.5 degrees. The maximum steering angle of the rear wheel 100 refers to the maximum angle reached by the rear wheel 100 turning left or right.

[0065] For example, α can be 3.5 degrees, 4 degrees, 4.5 degrees, 5 degrees, 5.5 degrees, 6 degrees, 6.5 degrees, 7 degrees, 7.5 degrees, or any value or range between any two adjacent values ​​mentioned above.

[0066] For example, α may be 5 degrees ± 0.5 degrees.

[0067] For another example, α may be greater than or equal to 3.5 degrees and less than 5 degrees, or α may be greater than 5 degrees and less than or equal to 7.5 degrees.

[0068] For another example, α may be greater than or equal to 5 degrees and less than or equal to 7.5 degrees, α may be greater than or equal to 5.5 degrees and less than or equal to 7.5 degrees, α may be greater than or equal to 6 degrees and less than or equal to 7.5 degrees, α may be greater than or equal to 6.5 degrees and less than or equal to 7.5 degrees, α may be greater than or equal to 7 degrees and less than or equal to 7.5 degrees, α may be greater than or equal to 3.5 degrees and less than or equal to 5 degrees, α may be greater than or equal to 4 degrees and less than or equal to 5 degrees, and α may be greater than or equal to 4.5 degrees and less than or equal to 5 degrees.

[0069] In this way, the maximum steering angle of the rear wheel 100 is within the above-mentioned numerical value and range, which helps to avoid the maximum steering angle of the rear wheel 100 being too large, resulting in a large steering space for the rear wheel 100 and occupying too much space in the vehicle's front-to-back direction x, left-right direction y and height direction z; and also helps to avoid the maximum steering angle of the rear wheel 100 being too small, resulting in difficulty in reducing the turning radius of the vehicle.

[0070] In this embodiment, in order to facilitate the connection between the rear suspension 2 and the rear floor 1, rear subframes 5 are respectively provided at the four corners of the rear suspension 2, and one end of the rear subframe 5 away from the rear suspension 2 is connected to the rear floor 1 by bolts.

[0071] Please refer to the attached Figure 6-8 In this embodiment, the dimension of the rear electric drive assembly 4 along the front-to-back direction of the vehicle is Y1, and the dimension along the height direction of the vehicle is Z1, 300mm≤Z1≤400mm, 250mm≤Y1≤310mm. This helps to make the structure of the rear electric drive assembly 4 more compact, and also helps to reduce the space occupied by the rear electric drive assembly 4 along the front-to-back direction and the height direction of the vehicle, so as to help the vehicle cabin have a larger space.

[0072] For example, when the rear motor has the same power and torque, the rear drive motor 41 and the rear reducer 42 are coaxially arranged, and the dimension of the rear electric drive assembly 4 along the height direction of the vehicle is approximately 310 mm; while other schemes, such as the rear motor and the rear reducer being arranged in parallel axes, the dimension of the rear electric drive assembly in the parallel axis arrangement along the height direction of the vehicle is approximately 480 mm; then the dimension of the rear electric drive assembly in the embodiment of the present application along the height direction of the vehicle is approximately 70 mm smaller than that of the parallel axis arrangement, thereby reducing the spatial position occupied by the rear electric drive assembly 4 along the height direction of the vehicle.

[0073] In some embodiments, the dimension Z1 of the rear electric drive assembly 4 along the height direction of the vehicle can be 300mm, 310mm, 320mm, 330mm, 340mm, 350mm, 360mm, 370mm, 380mm, 390mm, 400mm or any value or any range between any two adjacent values ​​mentioned above.

[0074] For example, the dimension of the rear electric drive assembly 4 along the height direction of the vehicle may be 390 mm±10 mm.

[0075] For another example, the dimension of the rear electric drive assembly 4 along the height direction of the vehicle may be: 390 mm ≤ Z1 ≤ 400 mm, or 390 mm ≤ Z1 ≤ 400 mm.

[0076] For another example, the dimension of the rear electric drive assembly 4 along the height direction of the vehicle may be: 300mm≤Z1≤390mm; 300mm≤Z1≤380mm; 300mm≤Z1≤370mm; 300mm≤Z1≤360mm; 300mm≤Z1≤350mm; 300mm≤Z1≤340mm; 300mm≤Z1≤330mm; 300mm≤Z1≤320mm; or 300mm≤Z1≤310mm.

[0077] In this way, the size of the rear electric drive assembly 4 along the height direction Z1 of the vehicle is within the above-mentioned values ​​and ranges, which helps to avoid the size of the rear electric drive assembly 4 along the height direction of the vehicle being too large and occupying too much space in the height direction, and also helps to avoid the size of the rear electric drive assembly 4 along the height direction of the vehicle being too small, resulting in the power and torque of the rear electric drive assembly 4 being limited by its small size and unable to be configured larger.

[0078] In some embodiments, the dimension of the rear electric drive assembly 4 along the front-to-rear direction Y1 of the vehicle may be 250mm, 255mm, 260mm, 265mm, 270mm, 275mm, 280mm, 285mm, 290mm, 295mm, 300mm, 305mm, 310mm or any value or any range between any two adjacent values.

[0079] For example, the dimension of the rear electric drive assembly 4 along the front-rear direction of the vehicle may be 310 mm±10 mm.

[0080] For another example, the size of the rear electric drive assembly 4 along the front-to-rear direction of the vehicle can be: 250mm≤Y1≤305mm, or 250mm≤Y1≤300mm; or 250mm≤Y1≤290mm; or 250mm≤Y1≤280mm; or 250mm≤Y1≤270mm; or 250mm≤Y1≤260mm; or 250mm≤Y1≤250mm; or 250mm≤Y1≤255mm.

[0081] In this way, the dimension Y1 of the rear electric drive assembly 4 along the front-to-back direction of the vehicle within the above-mentioned numerical values ​​and ranges can help prevent the rear electric drive assembly 4 from being too large in the front-to-back direction of the vehicle and occupying too much space in the front-to-back direction, and can also help prevent the rear electric drive assembly 4 from being too small in the front-to-back direction of the vehicle and causing the power and torque of the rear electric drive assembly 4 to be limited by its small size and unable to be configured larger.

[0082] Please refer to the attached Figure 8 In this embodiment, the rotating shaft 411 of the rear motor 41 is connected to the output shaft 421 of the rear reducer 42 through a transmission member, and a lubricating oil groove 4111 is provided on the outer wall of the rotating shaft 411 of the rear motor 41 or the output shaft 421 of the rear reducer 42 adjacent to the transmission member. The transmission member may be a spline 43. By providing the lubricating oil groove 4111, the lubricating oil can be screwed into the spline 43 during operation, and a lubricating oil flow is formed to lubricate the spline 43 and take away friction heat, thereby reducing the wear of the shaft and the spline 43 and preventing the shaft and the spline 43 from rusting.

[0083] The spline 43 includes a matching external spline 431 and an internal spline 432; that is, the external spline 431 and the internal spline 432 need to be respectively arranged on the rotating shaft 411 of the rear motor 41 and the output shaft 421 of the reducer 42. When setting, the external spline 431 can be arranged on the rotating shaft 411 of the rear motor 41, and the internal spline 432 can be arranged on the output shaft 421 of the rear reducer 42; or the internal spline 432 can be arranged on the rotating shaft 411 of the rear motor 41, and the external spline 432 can be arranged on the output shaft 421 of the rear reducer 42.

[0084] It should be noted that the external spline 431 and the lubricating oil groove 4111 are located on the same axis.

[0085] In some embodiments, the rated power of the rear motor 41 is P, which may be greater than or equal to 50 kW and less than or equal to 150 kW. For example, P may be 50 kW, 55 kW, 60 kW, 65 kW, 70 kW, 75 kW, 80 kW, 85 kW, 90 kW, 95 kW, 100 kW, 105 kW, 110 kW, 115 kW, 120 kW, 125 kW, 130 kW, 135 kW, 140 kW, 145 kW, 150 kW, or any value or range between any two adjacent values ​​thereof.

[0086] For example, P may be 135 kW ± 5 kW.

[0087] For another example, P may be: 135kW≤P≤150kW, or 50kW≤P≤135kW.

[0088] For another example, P may also be: 145kW≤P≤150kW; 140kW≤P≤150kW, 50kW≤P≤135kW, 50kW≤P≤130kW, 50kW≤P≤120kW, 50kW≤P≤110kW, 50kW≤P≤100kW, 50kW≤P≤90kW, 50kW≤P≤80kW, 50kW≤P≤70kW, or 50kW≤P≤60kW.

[0089] In this way, the rated power of the rear motor 41 is within the above-mentioned numerical value and range, which helps to avoid the rated power of the rear motor 41 being too large, resulting in the size of the rear motor being too large and occupying too much space in the front-to-back direction and height direction of the vehicle, and also helps to avoid the rated power of the rear motor 41 being too small, resulting in the carrying capacity of the rear electric drive assembly 4 being too small.

[0090] In some embodiments, the rated torque of the rear motor 41 is T, and the value range of T can be 130N·m≤T≤210N·m. For example, T can be 130N·m, 135N·m, 140N·m, 145N·m, 150N·m, 155N·m, 160N·m, 165N·m, 170N·m, 175N·m, 180N·m, 185N·m, 190N·m, 195N·m, 200N·m, 205N·m, 210N·m or any value or any range between any two adjacent values ​​of the above.

[0091] For example, T can be: 190N·m±5N·m.

[0092] For another example, T may be greater than or equal to 130 N·m and less than 190 N·m, or T may be greater than 190 N·m and less than or equal to 210 N·m.

[0093] For another example, T may be: 190N·m≤T≤210N·m, or 195N·m≤T≤210N·m, T may be 200N·m≤T≤210N·m, T may be 205N·m≤T≤210N·m, T may be 130N·m≤T≤190N·m, T may be 140N·m≤T≤190N·m, T may be 150N·m≤T≤190N·m, T may be 160N·m≤T≤190N·m, T may be 170N·m≤T≤190N·m, and T may be 180N·m≤T≤190N·m.

[0094] In this way, the rated torque of the rear motor 41 is within the above-mentioned numerical value and range, which helps to avoid the rated torque of the rear motor 41 being too large, causing the size of the rear motor 41 to be too large and occupying too much space in the front-to-back direction and height direction of the vehicle, and also helps to avoid the rated torque of the rear motor 41 being too small, causing the load-bearing capacity of the rear electric drive assembly 4 to be too small.

[0095] In this embodiment, the distance between the front end face of the front cross beam and the rear end face of the rear cross beam is 500mm≤d≤600mm, such as d is 500mm, 510mm, 520mm, 530mm, 540mm, 550mm, 560mm, 570mm, 580mm, 590mm, 600mm or any value or any range between any two adjacent values.

[0096] For example, d may be 550 mm ± 10 mm.

[0097] For another example, d may be greater than or equal to 500 mm and less than 550 mm, or greater than 550 mm and less than or equal to 600 mm. For another example, d may be greater than or equal to 590 mm and less than or equal to 600 mm, or greater than or equal to 580 mm and less than or equal to 600 mm, or greater than or equal to 570 mm and less than or equal to 600 mm, or greater than or equal to 560 mm and less than or equal to 600 mm, or greater than or equal to 550 mm and less than or equal to 600 mm, or greater than or equal to 500 mm and less than or equal to 550 mm, or greater than or equal to 500 mm and less than or equal to 540 mm, or greater than or equal to 500 mm and less than or equal to 530 mm, or greater than or equal to 500 mm and less than or equal to 520 mm, or greater than or equal to 500 mm and less than or equal to 510 mm.

[0098] In this way, the distance between the front end face of the front cross beam 21 of the rear suspension 2 and the rear end face of the rear cross beam 22 is within the above-mentioned values ​​and ranges, which helps to avoid the suspension being too large in the front-to-rear direction y of the vehicle and occupying too much space in the front-to-rear direction y, and also helps to avoid the rear suspension 2 being too small in the front-to-rear direction y of the vehicle and limiting the layout of the rear electric drive assembly, rear wheel steering gear or other structures.

[0099] In this embodiment, the rear floor 1 is an integrated die-cast structure. In this way, it is not necessary to form each structure of the rear floor separately and then weld them, which helps to reduce the number of parts of the rear floor and saves the process of assembling parts, which helps to improve production efficiency. The integrated die-cast structure also helps to have better performance consistency of the overall rear floor, and also helps to reduce the weight of the rear floor, which is beneficial to the lightweight of the entire vehicle. In addition, the rear floor of the integrated die-cast structure has greater strength and rigidity than the traditional cage-type welded body structure with 30 rings. It is possible to ensure the rigidity of the rear floor without adding 30 rings near the rear shock absorber and adding a crossbeam to the front and rear crossbeams of the rear suspension, thereby helping to reduce the space occupied by the rear floor assembly along the front-to-rear direction y and the left-to-right direction x of the vehicle.

[0100] In some embodiments, the rear floor panel 1 can be die-casted by vacuum high pressure technology.

[0101] In some embodiments, the rear floor 1 may be a die-casting part of an aluminum alloy (AlSi 10MnMg). The rear floor made of aluminum alloy can effectively reduce the weight of the structure and improve the strength and rigidity of the structure.

[0102] Please refer to the attached Fig. 9In this embodiment, the motor controller 30 includes a shell, a cooling water channel, a capacitor assembly 33, an IGBT module 34, a drive board 35, a control board 36 and a shielding plate 37. The shell is fixed on the shell of the rear motor 41; the cooling water channel is arranged inside the shell, and the shell is divided into an upper cavity and a lower cavity that are connected. Among them, the shell includes an annular shell body 31, and an upper cover 32 is provided at the upper end of the shell body 31, and the upper cavity is formed between the upper cover 32 and the cooling water channel. The lower cavity is formed between the cooling water channel and the outer shell of the rear motor 41. The capacitor assembly 33 is assembled in the upper cavity; the IGBT module 34 is assembled in the lower cavity and fits with the cooling water channel. At the same time, a sealing ring 38 is provided between the IGBT module 34 and the cooling water channel. The driving board 35 is installed in the lower cavity and is electrically connected to the IGBT module 34 ; the control board 36 is installed in the lower cavity and is electrically connected to the driving board 35 ; the shielding board 37 is disposed between the driving board 35 and the control board 36 .

[0103] The drive board 35, the control board 36 and the shielding plate 37 are integrated into a drive control assembly and arranged in the lower cavity, which can improve the integration of the motor controller 30 and help reduce the volume of the motor controller 30. At the same time, the shielding plate 37 is arranged between the drive board 35 and the control board 36, which can play a signal isolation effect and improve the electromagnetic compatibility and anti-interference ability of the motor controller 30. In addition, the cooling water channel arranged in the shell is used to achieve heat dissipation and cooling of the integrated capacitor assembly 33 and the IGBT module 34, which can effectively reduce the capacitor capacity 33 and cost under the same power.

[0104] The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present application. These improvements and substitutions should also be regarded as the scope of protection of the present application.

Claims

1. A vehicle rear axle, characterized in that: include: rear floor; A rear suspension, which is mounted below the rear floor and comprises a front crossbeam and a rear crossbeam which are arranged opposite to each other, and a rear tie rod is provided at each end of the rear suspension, and the rear tie rod is located between the front crossbeam and the rear crossbeam; A rear wheel steering gear, the rear wheel steering gear is arranged between the front cross beam and the rear cross beam, and the two ends of the rear wheel steering gear are respectively connected to the two rear tie rods; as well as A rear electric drive assembly, which is mounted on the rear suspension and is located behind the rear wheel steering gear; The motor controller is fixedly arranged on the top of the rear electric drive assembly.

2. The vehicle rear axle according to claim 1, characterized in that: The rear electric drive assembly includes a rear electric motor and a rear reducer. The rear electric motor and the rear reducer are arranged along the left-right direction of the vehicle, and the rotating shaft of the rear electric motor is coaxially arranged with the output shaft of the rear reducer.

3. The vehicle rear axle according to claim 2, characterized in that: The rotating shaft of the rear motor is connected to the output shaft of the rear reducer via a transmission member, and a lubricating oil groove is provided on the outer wall of the rotating shaft of the motor or the output shaft of the rear reducer adjacent to the transmission member.

4. The vehicle rear axle according to claim 3, characterized in that: The transmission member comprises a matching external spline and an internal spline; The external spline is arranged on the rotating shaft of the motor, and the internal spline is arranged on the output shaft of the rear reducer; Alternatively, the inner spline is arranged on the rotating shaft of the electric motor, and the outer spline is arranged on the output shaft of the rear reducer.

5. The vehicle rear axle according to any one of claims 1 to 4, characterized in that: The rear suspension is an H-arm suspension, the front crossbeam and the rear crossbeam are arranged in the front-rear direction of the vehicle, and the rear electric drive assembly is arranged between the front crossbeam and the rear crossbeam.

6. The vehicle rear axle according to claim 5, characterized in that: Rear steering knuckles are respectively arranged at both ends of the rear suspension, the middle part of the rear steering knuckle is used to connect the wheels, and one end of the rear steering knuckle is connected to the rear tie rod.

7. The vehicle rear axle according to claim 5, characterized in that: The distance between the front end surface of the front cross beam and the rear end surface of the rear cross beam is d, 500mm≤d≤600mm.

8. The vehicle rear axle according to any one of claims 1 to 4, characterized in that: The rear floor is an integral die-cast structure.

9. The vehicle rear axle according to any one of claims 1 to 4, characterized in that: The dimension of the rear electric drive assembly along the front-to-rear direction of the vehicle is Y1, and the dimension along the height direction of the vehicle is Z1, 300mm≤Z1≤400mm, 250mm≤Y1≤310mm.

10. The vehicle rear axle according to any one of claims 1 to 4, characterized in that: The motor controller comprises: A housing, fixedly mounted on the rear electric drive assembly; A cooling water channel is arranged inside the shell and divides the shell into an upper cavity and a lower cavity that are connected; A capacitor assembly is assembled in the upper cavity; An IGBT module is assembled in the lower cavity and fits in with the cooling water channel; A drive board, assembled in the lower cavity and electrically connected to the IGBT module; A control board, mounted in the lower cavity and electrically connected to the drive board; The shielding plate is arranged between the driving plate and the control plate.

11. A vehicle, characterized in that: The vehicle comprises a rear axle and a rear wheel as claimed in any one of claims 1 to 10, wherein the rear wheel is mounted on the rear axle.

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