Transmission assembly, drive axle and vehicle

Abstract

The invention relates to the technical field of drive axles, and discloses a transmission assembly, a drive axle and a vehicle, the transmission assembly comprises a transmission shell, the transmission shell is provided with a first bearing seat and a second bearing seat which are spaced in the first direction, and the axis of the first bearing seat and the axis of the second bearing seat coincide; the first bearing is arranged on the first bearing seat; the second bearing is arranged on the second bearing seat; the planetary reducer assembly is arranged in the transmission shell, the planetary reducer assembly comprises a gear ring, and the gear ring is rotatably supported on the first bearing; and the input transmission part is arranged in the transmission shell, the input transmission part is rotatably supported on the second bearing, and the planetary reducer assembly is in transmission connection with the input transmission part. According to the transmission assembly, the coaxiality of the axes between the rotary bodies is improved, the structural rigidity of the transmission shell is improved, the supporting reliability of the rotary bodies is also improved, and therefore the NVH performance is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of drive axles, and in particular, to a transmission assembly, a drive axle, and a vehicle. Background Art

[0002] In the prior art, the two bearings on both sides in the transmission assembly are respectively designed inside the motor housing and the axle housing. The two housings are connected into one body by bolts. The two housings are respectively machined with bearing positions of the transmission assembly, machined twice, and integrated into one body through assembly, resulting in poor coaxiality of the rotation centers of the two bearings of the transmission assembly. At the same time, the two bearings are respectively located in two housings, and the stiffness of the motor housing and the axle tube housing is inconsistent. Both housings participate in bearing. Under the action of load, the two bearings strain with the housings, and the rotation positions deviate from the designed positions. Due to the large difference in the stiffness of the two housings, the offset amounts are asynchronous, resulting in problems such as poor coaxiality, poor support effect, and poor NVH performance. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. For this purpose, the present invention provides a transmission assembly, which improves the coaxiality of the axes between rotating bodies such as a first bearing, a second bearing, a planetary reducer assembly, and an input transmission member, and improves the structural stiffness of the transmission housing and the NVH performance.

[0004] The present invention also provides a drive axle including the above-mentioned transmission assembly.

[0005] The present invention also provides a vehicle including the above-mentioned drive axle.

[0006] The transmission assembly according to an embodiment of the present invention includes: a transmission housing having a first bearing seat and a second bearing seat spaced apart in a first direction, and the axes of the first bearing seat and the second bearing seat coincide; a first bearing provided in the first bearing seat; a second bearing provided in the second bearing seat; a planetary reducer assembly provided in the transmission housing, the planetary reducer assembly including a ring gear rotatably supported by the first bearing; an input transmission member provided in the transmission housing, the input transmission member rotatably supported by the second bearing, and the planetary reducer assembly is in transmission connection with the input transmission member.

[0007] According to the transmission assembly of an embodiment of the present invention, the axes of the first bearing seat and the second bearing seat coincide; the first bearing is arranged on the first bearing seat, the second bearing is arranged on the second bearing seat, and the planetary reducer assembly is arranged inside the transmission housing. The planetary reducer assembly includes a ring gear, and the ring gear is rotatably supported by the first bearing; the input transmission member is arranged inside the transmission housing, and the input transmission member is rotatably supported by the second bearing, so that the first bearing seat, the second bearing seat and the transmission housing are designed with a common housing, thereby improving the coaxiality of the axes between the rotating bodies such as the first bearing, the second bearing, the planetary reducer assembly and the input transmission member, and improving the structural stiffness of the transmission housing, and also improving the support reliability for the rotating bodies such as the first bearing, the second bearing, the planetary reducer assembly and the input transmission member, thereby improving the NVH performance.

[0008] In some embodiments of the present invention, the number of the second bearing seats is two, the two second bearing seats are spaced apart in the first direction, the number of the second bearings is two, and they correspond to the two second bearing seats one by one, and both ends of the input transmission member in the first direction are respectively supported by the two second bearings.

[0009] In some embodiments of the present invention, the transmission housing further has an annular planetary mounting seat, the planetary mounting seat is coaxially arranged with the first bearing seat and the second bearing seat, and the planetary reducer assembly further includes a planetary fixing frame, and the planetary fixing frame is connected to the planetary mounting seat.

[0010] In some embodiments of the present invention, along the first direction, the planetary mounting seat is arranged between the first bearing seat and the second bearing seat.

[0011] In some embodiments of the present invention, the planetary reducer assembly further includes: a sun gear, the sun gear is connected to the input transmission member; a planetary fixing frame, the planetary fixing frame is relatively fixed to the transmission housing; a planetary carrier, the planetary carrier is rotatably arranged on the planetary fixing frame; a plurality of planetary gears, the planetary gears are all rotatably arranged on the planetary carrier, the plurality of planetary gears are all arranged radially outside the sun gear and mesh with the sun gear, and the ring gear is sleeved outside the plurality of planetary gears and meshes internally with the plurality of planetary gears.

[0012] In some embodiments of the present invention, the planetary reducer assembly further includes: a shifting component, the shifting component is fixed to the planetary carrier, the shifting component has a first state and a second state, in the first state, the shifting component is relatively fixed to the planetary fixing frame, and in the second state, the shifting component is separated from the planetary fixing frame.

[0013] In some embodiments of the present invention, the planetary carrier has a first limiting member, and the shifting assembly includes a fixing member and a gear position member. The fixing member is fixed to the planetary carrier, and the gear position member is movable relative to the fixing member between a first position and a second position. In the first position, the gear position member is connected to the first limiting member, and the shifting assembly is switched to the first state; in the second position, the gear position member is separated from the first limiting member, and the shifting assembly is switched to the second state.

[0014] In some embodiments of the present invention, the planetary carrier includes a bracket portion and a first shaft portion. The planetary gear is provided on the bracket portion. The first shaft portion is connected to the bracket portion and extends along the first direction. The fixing member is annularly extended along the circumferential direction of the first shaft portion and is sleeved and fixed on the outer side of the first shaft portion.

[0015] In some embodiments of the present invention, the planetary carrier and the shifting assembly are arranged in the first direction, and the gear position member is movably arranged on the fixing member between the first position and the second position along the first direction.

[0016] In some embodiments of the present invention, both the fixing member and the gear position member are annular, and the gear position member is sleeved on the outer side of the fixing member. A first limiting protrusion is provided on the inner peripheral wall of the gear position member, and a first limiting groove extending along the first direction is provided on the outer peripheral wall of the fixing member. The first limiting protrusion is fitted in the first limiting groove and is slidable relative to the first limiting groove along the first direction.

[0017] In some embodiments of the present invention, a second limiting groove extending along the first direction is provided on the outer peripheral wall of the first limiting member. In the first position of the gear position member, a part of the first limiting protrusion is fitted in the second limiting groove, and another part is fitted in the first limiting groove.

[0018] In some embodiments of the present invention, the transmission assembly further includes an output transmission assembly. One end of the output transmission assembly is in transmission connection with the input transmission member, and the other end is adapted to be in transmission connection with the motor.

[0019] In some embodiments of the present invention, the output transmission assembly is a gear transmission assembly, the input transmission member is a gear member, and the output transmission assembly includes a first gear, a second gear, and a third gear. The first gear is adapted to be in transmission connection with the motor shaft of the motor. The second gear and the third gear are coaxially fixed. The second gear meshes with the first gear, and the third gear meshes with the input transmission member.

[0020] In some embodiments of the present invention, a partition is provided in the transmission housing to divide the space in the transmission housing into a first cavity and a second cavity, the planetary reducer assembly, the first bearing seat, the second bearing seat, and the input transmission component are all located in the first cavity, and the output transmission assembly is arranged in the second cavity.

[0021] In some embodiments of the present invention, a first oil injection hole and a second oil injection hole connected to the oil pump are formed in the transmission housing, the first oil injection hole is connected to the first cavity, the second oil injection hole is connected to the second cavity, the partition is provided with an oil return hole, and the transmission housing is configured to allow the oil in the first cavity to flow to the second cavity through the oil return hole under the action of gravity.

[0022] In some embodiments of the present invention, the highest height of the oil at the bottom of the second cavity is lower than the lowest position of the output transmission assembly.

[0023] In some embodiments of the present invention, the oil return hole is located at the bottom of the first cavity, and a one-way valve is provided in the oil return hole for controlling the one-way flow of oil from the first cavity to the second cavity.

[0024] In some embodiments of the present invention, the oil return hole is located at the bottom of the first cavity, and the lowest point of the first cavity is higher than the highest height of the oil at the bottom of the second cavity.

[0025] In some embodiments of the present invention, the transmission assembly further includes: a filter, wherein an inlet of the filter is connected to an outlet of the oil pump.

[0026] In some embodiments of the present invention, the filter includes a coarse filter and a fine filter connected in series in sequence, and the coarse filter is connected to a side of the fine filter facing the oil pump inlet.

[0027] In some embodiments of the present invention, the transmission assembly further includes: an oil cooler, which is communicated with the filter and is located on a side of the filter away from the oil pump along the oil flow direction.

[0028] In some embodiments of the present invention, the inner wall surface of the first cavity is an arc surface; and / or the inner wall surface of the second cavity is an arc surface.

[0029] The drive axle according to an embodiment of the present invention comprises: the above-mentioned transmission assembly; two half-shafts, the two half-shafts extending along the first direction and arranged at intervals along the first direction, the facing ends of the two half-shafts both extending into the transmission housing and respectively connected to the planetary reducer assembly in driving connection; a motor assembly, the motor assembly comprising a motor, and the motor is connected to the input transmission member in driving connection.

[0030] According to the drive axle of an embodiment of the present invention, by providing the above-mentioned transmission assembly, the axes of the first bearing seat and the second bearing seat coincide; the first bearing is provided in the first bearing seat, the second bearing is provided in the second bearing seat, the planetary reducer assembly is provided in the transmission housing, the planetary reducer assembly includes a ring gear, and the ring gear is rotatably supported by the first bearing; the input transmission member is provided in the transmission housing and is rotatably supported by the second bearing, so that the first bearing seat, the second bearing seat and the transmission housing are designed with a common housing, thereby improving the coaxiality of the axes between the rotating bodies such as the first bearing, the second bearing, the planetary reducer assembly and the input transmission member, and improving the structural stiffness of the transmission housing, and also improving the support reliability for the rotating bodies such as the first bearing, the second bearing, the planetary reducer assembly and the input transmission member, thereby improving the NVH performance.

[0031] In some embodiments of the present invention, the motor assembly further includes a motor housing, and the motor housing and the transmission housing are an integral part.

[0032] A vehicle according to an embodiment of the present invention includes the above-mentioned drive axle.

[0033] According to the vehicle of an embodiment of the present invention, by providing the above-mentioned drive axle and the above-mentioned transmission assembly, the axes of the first bearing seat and the second bearing seat coincide; the first bearing is provided in the first bearing seat, the second bearing is provided in the second bearing seat, the planetary reducer assembly is provided in the transmission housing, the planetary reducer assembly includes a ring gear, and the ring gear is rotatably supported by the first bearing; the input transmission member is provided in the transmission housing and is rotatably supported by the second bearing, so that the first bearing seat, the second bearing seat and the transmission housing are designed with a common housing, thereby improving the coaxiality of the axes between the rotating bodies such as the first bearing, the second bearing, the planetary reducer assembly and the input transmission member, and improving the structural stiffness of the transmission housing, and also improving the support reliability for the rotating bodies such as the first bearing, the second bearing, the planetary reducer assembly and the input transmission member, thereby improving the NVH performance.

[0034] The additional aspects and advantages of the present invention will be partially given in the following description, partially become apparent from the following description, or be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, wherein: Figure 1 is a partial front view sectional view of the drive axle according to an embodiment of the present invention; Figure 2 is Figure 1 an enlarged view of part A in Figure 3It is an exploded view of a transmission assembly according to an embodiment of the present invention; Figure 4 It is a perspective view of a transmission assembly according to an embodiment of the present invention; Figure 5 It is a front view of a transmission assembly according to an embodiment of the present invention; Figure 6 It is an exploded view of the transmission assembly from another perspective according to an embodiment of the present invention, wherein the oil circuit is shown; Figure 7 is Figure 6 an enlarged view of part B in

[0036] Reference numerals: 100, drive axle; 10, transmission assembly; 1, transmission housing; 11, first bearing seat; 12, second bearing seat; 13, planetary mounting seat; 14, first cavity; 15, second cavity; 16, partition; 17, oil return hole; 18, oil pipeline; 181, first pipeline; 182, second pipeline; 183, third pipeline; 2, planetary reducer assembly; 21, ring gear; 22, planetary fixed frame; 221, first limiting member; 23, planetary carrier; 231, first shaft portion; 232, bracket portion; 24, planetary gear; 25, sun gear; 26, shift assembly; 261, fixing member; 262, gear position member; 27, differential; 3, first bearing; 4, second bearing; 5, input transmission member; 6, output transmission assembly; 61, first gear; 62, second gear; 63, third gear; 7, filter; 71, coarse filter; 72, fine filter; 8, oil cooler; 9, oil pump; 20, half shaft; 30, motor assembly; 40, wheel hub assembly; 50, brake assembly; 60, axle housing. Detailed implementation manners

[0037] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0038] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more. In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] The following refers to Figures 1 - 7 Describe the transmission assembly 10 according to an embodiment of the present invention.

[0040] As Figures 1 - 7 shown, the transmission assembly 10 according to an embodiment of the present invention includes: a transmission housing 1, a first bearing 3, a second bearing 4, a planetary reduction gear assembly 2, and an input transmission member 5.

[0041] Specifically, referring to Figures 1 - 4 , the transmission housing 1 has a first bearing seat 11 and a second bearing seat 12 spaced apart along a first direction (such as the c direction shown in Figure 1 ), and the axes of the first bearing seat 11 and the second bearing seat 12 coincide; the first bearing 3 is provided in the first bearing seat 11, the second bearing 4 is provided in the second bearing seat 12, the planetary reduction gear assembly 2 is provided in the transmission housing 1, and the planetary reduction gear assembly 2 includes a ring gear 21, and the ring gear 21 is rotatably supported by the first bearing 3; the input transmission member 5 is provided in the transmission housing 1, the input transmission member 5 is rotatably supported by the second bearing 4, and the planetary reduction gear assembly 2 is in transmission connection with the input transmission member 5.

[0042] It can be understood that the first bearing seat 11, the second bearing seat 12 and the transmission housing 1 are integral parts. On the one hand, the positions of the first bearing seat 11 and the second bearing seat 12 are relatively fixed and the axis coincidence degree is high. On the other hand, when the transmission housing 1 is subjected to vibration and deformation, the deformation amounts of the first bearing seat 11 and the second bearing seat 12 are quite the same, so that when the transmission housing 1 is subjected to vibration and deformation, the axes of the first bearing seat 11 and the second bearing seat 12 will not shift.

[0043] Therefore, when the first bearing 3 is arranged on the first bearing seat 11 and the second bearing 4 is arranged on the second bearing seat 12, the coaxiality of the axes of the first bearing 3 and the second bearing 4 can be improved. Since the gear ring 21 is rotatably supported by the first bearing 3 and the input transmission member 5 is rotatably supported by the second bearing 4, the coaxiality of the axes among the first bearing 3, the second bearing 4, the planetary reducer assembly 2 and the input transmission member 5 and other rotating bodies is improved, ensuring the consistency of the design reference and the process reference of the transmission assembly 10.

[0044] Moreover, since the first bearing 3, the second bearing 4, the planetary reducer assembly 2 and the input transmission member 5 and other rotating bodies are located in the same transmission housing 1, they can be processed and formed by one clamping, avoiding the machining errors or assembly errors caused by the assembly between different housings when the first bearing 3, the second bearing 4, the planetary reducer assembly 2 and the input transmission member 5 and other rotating bodies are located in different housings, and further ensuring the coaxiality of the axes among the first bearing 3, the second bearing 4, the planetary reducer assembly 2 and the input transmission member 5 and other rotating bodies.

[0045] In addition, since the first bearing seat 11, the second bearing seat 12 and the transmission housing 1 are integral parts, the structural stiffness of the transmission housing 1 is improved, and the support reliability for the first bearing 3, the second bearing 4, the planetary reducer assembly 2 and the input transmission member 5 and other rotating bodies is also improved, thus improving the NVH (Noise, Vibration, and Harshness) performance.

[0046] Furthermore, as Figures 1 - 4 shown, the gear ring 21 is rotatably supported by the first bearing 3, so that the gear ring 21 can rotate relative to the transmission housing 1, avoiding a too rigid connection between the gear ring 21 and the transmission housing 1, reducing the vibration transmission between the transmission housing 1 and the gear ring 21, reducing the damage probability of the gear ring 21 and the internal parts of the planetary reducer assembly 2, and improving the service life of the planetary reducer assembly 2.

[0047] Furthermore, as Figures 1 - 4As shown, the planetary speed reducer assembly 2 is in transmission connection with the input transmission member 5, and the input transmission member 5 is in transmission connection with the motor assembly 30. One side of the transmission housing 1 in the radial direction of the first bearing seat 11 is open, so as to facilitate the assembly of the planetary speed reducer assembly 2 and the input transmission member 5 into the transmission housing 1 through the open port on one side of the transmission housing 1 in the radial direction of the first bearing seat 11. At the same time, one side of the transmission housing 1 in the radial direction of the first bearing seat 11 can be connected to the axle housing 60, so as to close the open port.

[0048] Furthermore, as Figures 1 - 4 shown, along the first direction, the planetary speed reducer assembly 2 is arranged between the first bearing seat 11 and the second bearing seat 12, and the input transmission member 5 is arranged on the side of the planetary speed reducer assembly 2 facing the second bearing seat 12.

[0049] For the transmission assembly 10 according to the embodiment of the present invention, the axes of the first bearing seat 11 and the second bearing seat 12 coincide; the first bearing 3 is arranged in the first bearing seat 11, the second bearing 4 is arranged in the second bearing seat 12, the planetary speed reducer assembly 2 is arranged in the transmission housing 1, and the planetary speed reducer assembly 2 includes a ring gear 21, and the ring gear 21 is rotatably supported by the first bearing 3; the input transmission member 5 is arranged in the transmission housing 1, and the input transmission member 5 is rotatably supported by the second bearing 4, so that the first bearing seat 11, the second bearing seat 12 and the transmission housing 1 are designed with a common housing, thereby improving the coaxiality of the axes between the rotating bodies such as the first bearing 3, the second bearing 4, the planetary speed reducer assembly 2 and the input transmission member 5, and improving the structural stiffness of the transmission housing 1, and also improving the support reliability for the rotating bodies such as the first bearing 3, the second bearing 4, the planetary speed reducer assembly 2 and the input transmission member 5, thereby improving the NVH performance.

[0050] In some embodiments of the present invention, as Figures 1 - 4 shown, the number of the second bearing seats 12 is two, the two second bearing seats 12 are spaced apart in the first direction, the number of the second bearings 4 is two, and they correspond to the two second bearing seats 12 one by one, and both ends of the input transmission member 5 in the first direction are respectively supported by the two second bearings 4.

[0051] It can be understood that the input transmission member 5 is supported by the two second bearings 4 to rotate, so that the rotation of the input transmission member 5 is more stable. At the same time, the axes of the two second bearing seats 12 coincide, further improving the coaxiality of the axes between the rotating bodies such as the first bearing 3, the second bearing 4, the planetary speed reducer assembly 2 and the input transmission member 5, and improving the structural stiffness of the transmission housing 1, and also improving the support reliability for the rotating bodies such as the first bearing 3, the second bearing 4, the planetary speed reducer assembly 2 and the input transmission member 5, thereby improving the NVH performance.

[0052] In some embodiments of the present invention, asFigures 1 - 4 As shown, the transmission housing 1 further has an annular planetary mount 13. The planetary mount 13 is coaxially arranged with the first bearing housing 11 and the second bearing housing 12. The planetary reducer assembly 2 further includes a planetary carrier 22, and the planetary carrier 22 is connected to the planetary mount 13.

[0053] It can be understood that by coaxially arranging the planetary mount 13 with the first bearing housing 11 and the second bearing housing 12, the coaxiality of the axes between the first bearing 3, the second bearing 4, the planetary reducer assembly 2, the input transmission member 5 and other rotating bodies is further improved, and the structural rigidity of the transmission housing 1 is improved, and the support reliability for the first bearing 3, the second bearing 4, the planetary reducer assembly 2, the input transmission member 5 and other rotating bodies is also improved, thereby improving the NVH performance.

[0054] In some embodiments of the present invention, as Figures 1 - 4 shown, along the first direction, the planetary mount 13 is arranged between the first bearing housing 11 and the second bearing housing 12. Thereby, the planetary mount 13 is reasonably installed and can better support the planetary reducer assembly 2.

[0055] In some embodiments of the present invention, as Figures 1 - 4 shown, the planetary reducer assembly 2 further includes: a sun gear 25, a planetary carrier 22, a planet carrier 23, and a plurality of planet gears 24.

[0056] The sun gear 25 is connected to the input transmission member 5; the planetary carrier 22 is relatively fixed to the transmission housing 1; the planet carrier 23 is rotatably arranged on the planetary carrier 22; the planet gears 24 are all rotatably arranged on the planet carrier 23. The plurality of planet gears 24 are all arranged radially outside the sun gear 25 and mesh with the sun gear 25. The ring gear 21 is sleeved outside the plurality of planet gears 24 and meshes internally with the plurality of planet gears 24.

[0057] It can be understood that the planetary reducer assembly 2 further includes a differential 27. The input transmission member 5 transmits power to the sun gear 25. The sun gear 25 rotates and transmits power to the planet gears 24 (the planet gears 24 can rotate self - axially and also revolve around the sun gear 25). The planet gears 24 transmit power to the ring gear 21. The ring gear 21 is connected to the housing of the differential 27. Thus, power is transmitted to the differential 27 through the rotation of the ring gear 21. The differential 27 is drivingly connected to two half - shafts 20, and the two half - shafts 20 are respectively drivingly connected to two hub assemblies 40, thereby realizing power transmission and vehicle driving.

[0058] In some embodiments of the present invention, as Figures 1 - 4As shown, the planetary speed reducer assembly 2 further includes: a shift component 26, which is fixed to the planet carrier 23. The shift component 26 has a first state and a second state. In the first state, the shift component 26 is relatively fixed to the planet fixed frame 22. In the second state, the shift component 26 is separated from the planet fixed frame 22.

[0059] It can be understood that in the first state, the shift component 26 is relatively fixed to the planet fixed frame 22. Since the shift component 26 is fixed to the planet carrier 23, the planet fixed frame 22 and the planet carrier 23 are relatively fixed. At this time, the planet gear 24 cannot revolve and can only rotate, so that there is a transmission speed ratio between the sun gear 25 and the ring gear 21, realizing speed reduction and gear upshift, and the vehicle can climb slopes, etc.

[0060] In the second state, the shift component 26 is separated from the planet fixed frame 22, and the planet carrier 23 is released. The planet carrier 23 can rotate, so that the planet gear 24 revolves and rotates, and there is no transmission speed ratio between the sun gear 25 and the ring gear 21, realizing normal driving. Thus, in this application, shifting and speed changing are realized through a single planetary speed reducer assembly 2, with a simple structure and good stability.

[0061] In some embodiments of the present invention, as Figures 1 - 4 shown, the planet fixed frame 22 has a first limiting member 221. The shift component 26 includes: a fixing member 261 and a gear position member 262. The fixing member 261 is fixed to the planet carrier 23. The gear position member 262 is movable relative to the fixing member 261 between a first position and a second position. In the first position, the gear position member 262 is connected to the first limiting member 221, and the shift component 26 is switched to the first state; in the second position, the gear position member 262 is separated from the first limiting member 221, and the shift component 26 is switched to the second state.

[0062] It can be understood that in the first position, the gear position member 262 is connected to the first limiting member 221, so as to realize the relative fixation among the gear position member 262, the fixing member 261, the planet carrier 23 and the planet fixed frame 22, thereby realizing speed reduction and gear upshift, and the vehicle can climb slopes, etc. In the second position, the gear position member 262 is separated from the first limiting member 221, and the shift component 26 is switched to the second state, so that the shift component 26 is separated from the planet fixed frame 22, and the planet carrier 23 is released. The planet carrier 23 can rotate, so that the planet gear 24 revolves and rotates.

[0063] In some embodiments of the present invention, as Figures 1 - 4As shown, the planet carrier 23 includes a support portion 232 and a first shaft portion 231. The planet gear 24 is disposed on the support portion 232. The first shaft portion 231 is connected to the support portion 232 and extends along a first direction. The fixing member 261 extends circumferentially along the first shaft portion 231 to form a ring and is sleeved and fixed on the outer side of the first shaft portion 231. Among them, the fixing member 261 and the first shaft portion 231 can be fixedly connected by splines, thereby realizing the above-mentioned gear shift.

[0064] In some embodiments of the present invention, as Figures 1 - 4 shown, the planet fixing frame 22 and the shifting assembly 26 are arranged in the first direction. The gear member 262 is movably disposed on the fixing member 261 between a first position and a second position along the first direction.

[0065] It can be understood that the first limiting member 221 is disposed on the side of the planet fixing frame 22 facing the fixing member 261 (for example, in the present invention, the first limiting member 221 is disposed on the side of the planet fixing frame 22 facing the input transmission member 5). Since the gear member 262 is annular, the axis of the gear member 262 extends along the first direction, and the gear member 262 is movably disposed on the fixing member 261 between the first position and the second position along the first direction, so the movement of the gear member 262 is relatively easy to achieve, reducing the movement interference at the structural level.

[0066] In some embodiments of the present invention, as Figures 1 - 4 shown, both the fixing member 261 and the gear member 262 are annular, and the gear member 262 is sleeved on the outer side of the fixing member 261. A first limiting protrusion is provided on the inner peripheral wall of the gear member 262, and a first limiting groove extending along the first direction is provided on the outer peripheral wall of the fixing member 261. The first limiting protrusion cooperates with the first limiting groove and can slide relative to the first limiting groove along the first direction.

[0067] It can be understood that the first limiting groove penetrates through the fixing member 261 along the first direction, so that the gear member 262 can move onto the first limiting member 221. The mutual cooperation between the first limiting protrusion and the first limiting groove can, on the one hand, prevent relative rotation between the gear member 262 and the fixing member 261, and on the other hand, can realize the movement of the gear member 262 in the first direction to achieve gear shifting.

[0068] Furthermore, the first limiting protrusions and the first limiting grooves are multiple and arranged circumferentially along the gear member 262. Thereby, the limiting reliability between the gear member 262 and the fixing member 261 is improved, and further relative rotation between the gear member 262 and the fixing member 261 is avoided.

[0069] In some embodiments of the present invention, as Figures 1 - 4As shown, a second limiting groove extending in the first direction is provided on the outer peripheral wall of the first limiting member 221. When the shifting member 262 is in the first position, a part of the first limiting protrusion is engaged in the second limiting groove, and the other part is engaged in the first limiting groove.

[0070] It can be understood that the second limiting groove penetrates the fixing member 261 along the first direction, so that the shifting member 262 can move onto the first limiting member 221. The mutual cooperation between the first limiting protrusion and the second limiting groove can, on the one hand, prevent relative rotation between the shifting member 262 and the first limiting member 221, thereby improving the connection reliability between the shifting assembly 26, the planet carrier 23 and the planet fixing frame 22 in the first state. On the other hand, it can enable the shifting member 262 to move in the first direction to achieve shifting.

[0071] Furthermore, there are multiple second limiting grooves corresponding one-to-one to the multiple first limiting protrusions. Thus, it further prevents relative rotation between the shifting member 262 and the first limiting member 221, thereby improving the connection reliability between the shifting assembly 26, the planet carrier 23 and the planet fixing frame 22 in the first state.

[0072] In some embodiments of the present invention, as Figure 3 shown, the transmission assembly 10 further includes: an output transmission assembly 6. One end of the output transmission assembly 6 is in transmission connection with the input transmission member 5, and the other end is adapted to be in transmission connection with the motor. Thus, power is transmitted from the motor to the transmission assembly 10 to achieve vehicle power output.

[0073] In some embodiments of the present invention, as Figure 3 shown, the output transmission assembly 6 is a gear transmission assembly, and the input transmission member 5 is a gear member. Among them, the gear member has a coupling shaft in the first direction, and the second bearing 4 is sleeved outside the coupling shaft.

[0074] The output transmission assembly 6 includes: a first gear 61, a second gear 62 and a third gear 63. The first gear 61 is adapted to be in transmission connection with the motor shaft of the motor. The second gear 62 and the third gear 63 are coaxially fixed. The second gear 62 meshes with the first gear 61, and the third gear 63 meshes with the input transmission member 5.

[0075] It can be understood that the second gear 62 and the third gear 63 are connected by a rotating shaft. The first gear 61 and the second gear 62 are the first set of parallel gears, and the input transmission member 5 and the third gear 63 are the second set of parallel gears. Thus, through the above-mentioned setting method, the power transmission can be achieved by two sets of parallel gears, making the structure simple, the power transmission more stable, and reducing vibration. At the same time, through the above-mentioned setting method, the situation of idler gears is avoided, further making the power transmission more stable and reducing vibration.

[0076] In some embodiments of the present invention, as Figure 4 and Figure 5 shown, a partition plate 16 is provided in the transmission housing 1 to divide the space in the transmission housing 1 into a first cavity 14 and a second cavity 15. The planetary reducer assembly 2, the first bearing seat 11, the second bearing seat 12, and the input transmission member 5 are all located in the first cavity 14, and the output transmission assembly 6 is provided in the second cavity 15.

[0077] Among them, as Figures 1 - 4 shown, the transmission housing 1 further has an annular planetary mounting seat 13. The planetary mounting seat 13 is coaxially arranged with the first bearing seat 11 and the second bearing seat 12. The planetary reducer assembly 2 further includes a planetary fixing frame 22, and the planetary fixing frame 22 is connected to the planetary mounting seat 13. The planetary mounting seat 13 is also provided in the first cavity 14.

[0078] In some embodiments of the present invention, as Figure 4 and Figure 5 shown, a first oil injection hole and a second oil injection hole communicating with the oil pump 9 are formed in the transmission housing 1. The first oil injection hole communicates with the first cavity 14, and the second oil injection hole communicates with the second cavity 15. The partition plate 16 has an oil return hole 17. The transmission housing 1 is configured to enable the oil in the first cavity 14 to flow to the second cavity 15 through the oil return hole 17 under the action of gravity.

[0079] It can be understood that under the action of the oil pump 9, the oil at the bottom of the second cavity 15 reaches the first oil injection hole and the second oil injection hole through the oil pipeline 18 in the transmission housing 1, so as to realize oil injection for the structures in the first cavity 14 and the second cavity 15. The oil in the first cavity 14 flows from the oil return hole 17 to the bottom of the second cavity 15 through the inner wall of the transmission housing 1, and the oil in the second cavity 15 flows to the bottom of the second cavity 15 through the inner wall of the transmission housing 1.

[0080] Since the oil is located at the bottom of the second cavity 15, it is possible to prevent the structures in the first cavity 14 from contacting a large amount of oil, and it is also possible to reduce the amount of oil contacted by the structures in the second cavity 15, thereby reducing the oil agitation loss during the operation of the transmission assembly 10. At the same time, the oil pipeline 18, the first oil injection hole, and the second oil injection hole are directly formed in the transmission housing 1, thereby reducing the setting of the oil pipeline, making the structure simple. At the same time, when returning oil, the inner wall of the transmission housing 1 also forms a flow channel for the oil, thereby further reducing the setting of the oil pipeline and making the structure simple.

[0081] Furthermore, as Figure 4 and Figure 5As shown, the first direction is the horizontal direction. The first cavity 14 and the second cavity 15 are arranged in a direction perpendicular to the first direction and the up-and-down direction. Through the reasonable arrangement of the transmission assembly 10, the oil can be deposited at the bottom of the second cavity 15 under the action of gravity, and the oil pump 9 is arranged in the second cavity 15, providing a flow power for the oil at the bottom of the second cavity 15, so that the oil can circulate better in the transmission housing 1.

[0082] Further, the first injection holes are multiple and spaced apart along the horizontal direction, and are arranged at the upper part of the first cavity 14, so that the injection can cover more areas of the first cavity 14 and better ensure the operation of the transmission assembly 10.

[0083] Further, the second injection holes are multiple and spaced apart along the horizontal direction, and are arranged at the upper part of the second cavity 15, so that the injection can cover more areas of the second cavity 15 and better ensure the operation of the transmission assembly 10.

[0084] In some embodiments of the present invention, as Figure 4 and Figure 5 shown, the highest height of the oil at the bottom of the second cavity 15 (such as Figure 5 the oil level surface s shown) is less than the lowest position of the output transmission component 6. Thus, it is possible to avoid the output transmission component 6 contacting the oil at the bottom of the second cavity 15, thereby further reducing the oil churning loss during the operation of the transmission assembly 10.

[0085] In some embodiments of the present invention, as Figure 4 and Figure 5 shown, the oil return hole 17 is located at the bottom of the first cavity 14, and a one-way valve is provided in the oil return hole 17 for controlling the one-way flow of oil from the first cavity 14 to the second cavity 15. Thus, it is possible to avoid the oil flowing directly from the second cavity 15 into the first cavity 14, further ensuring the dry-wet separation, and further avoiding the structures in the first cavity 14 contacting a large amount of oil, thereby further reducing the oil churning loss.

[0086] In some embodiments of the present invention, the oil return hole 17 is located at the bottom of the first cavity 14, and the lowest point of the first cavity 14 is higher than the highest height of the oil at the bottom of the second cavity 15. Thus, it is possible to ensure that the oil enters the second cavity 15 and avoid the oil accumulating at the bottom of the first cavity 14. Thus, the dry-wet separation is further ensured, and further, the structures in the first cavity 14 are avoided from contacting a large amount of oil, thereby further reducing the oil churning loss.

[0087] In some embodiments of the present invention, as Figures 5 - 6As shown, the transmission assembly 10 further includes: a filter 7, the inlet of the filter 7 is connected to the outlet of the oil pump 9. The filter 7 is arranged at the bottom of the second cavity 15, so that the distance between the filter 7 and the oil pump 9 is shortened, and the oil circulation efficiency is improved. The setting of the filter 7 can improve the oil quality, remove impurities in the oil, avoid damage to the transmission assembly 10, and increase the service life.

[0088] In some embodiments of the present invention, Figures 5 - 6 As shown, the filter 7 includes a coarse filter 71 and a fine filter 72 connected in series, and the coarse filter 71 is connected to the side of the fine filter 72 facing the inlet of the oil pump 9. Thus, through two filtering steps, the oil quality is further improved, impurities in the oil are removed, damage to the transmission assembly 10 is avoided, and the service life is increased.

[0089] In some embodiments of the present invention, Figures 5 - 6 As shown, the transmission assembly 10 further includes: an oil cooler 8, which is connected to the filter 7 and is located on the side of the filter 7 away from the oil pump 9 along the oil flow direction. It can be understood that the setting of the oil cooler 8 allows the oil to be cooled, thereby achieving cooling of the structure in the transmission assembly 10 to ensure the normal operation of the transmission assembly 10. Among them, the oil cooler 8 can be arranged at the top, so that the oil can quickly reach the top of the first cavity 14 and the second cavity 15, thereby improving the transportation and circulation efficiency of the oil.

[0090] Furthermore, if Figure 6 and Figure 7 As shown, the oil pipeline 18 includes a first pipeline 181 (wherein the first pipeline 181 can be formed as an oil pipe or as a hole on the transmission housing 1), the oil pipeline 18 includes the first pipeline 181, the first pipeline 181 is used to connect the fine filter 72 and the coarse filter 71, and the first pipeline 181 extends in a horizontal direction (the first direction and a direction perpendicular to the first direction and the up and down directions).

[0091] Furthermore, if Figure 6 and Figure 7 As shown, the oil pipeline 18 includes a second pipeline 182 extending in the up-down direction (wherein the second pipeline 182 can be formed as an oil pipe or as a hole on the transmission housing 1 ), and the second pipeline 182 is used to connect the fine filter 72 and the oil cooler 8 .

[0092] Furthermore, if Figure 1 , Figures 6 - 7As shown, the oil pipeline 18 includes three third pipelines 183 (wherein, the third pipeline 183 can be formed as a pipeline or a hole on the transmission housing 1). One end of each of the three third pipelines 183 is connected to the oil cooler 8. The three third pipelines 183 are arranged in a direction perpendicular to the first direction and the up-and-down direction, and are respectively located in the motor assembly 30, the first cavity 14, and the second cavity 15. Each third pipeline 183 extends in the first direction to the end where the oil pump 9 is located. Each third pipeline 183 has a plurality of nozzles spaced apart in the first direction, and is respectively used to spray oil into the motor assembly 30, the first cavity 14, and the second cavity 15.

[0093] In some embodiments of the present invention, the inner wall surface of the first cavity 14 is an arc surface. Thus, it is convenient for the oil to flow on the inner wall surface of the first cavity 14, improving the flow efficiency. In some embodiments of the present invention, the inner wall surface of the second cavity 15 is an arc surface. Thus, it is convenient for the oil to flow on the inner wall surface of the second cavity 15, improving the flow efficiency.

[0094] Next, refer to Figure 1 Describe the drive axle 100 according to an embodiment of the present invention.

[0095] As Figure 1 shown, the drive axle 100 according to an embodiment of the present invention includes: the above-mentioned transmission assembly 10, two half shafts 20, and a motor assembly 30. The two half shafts 20 extend in the first direction and are arranged at intervals in the first direction. The opposite ends of the two half shafts 20 extend into the transmission housing 1 and are respectively connected to the planetary reducer assembly 2 in a transmission manner. The motor assembly 30 includes a motor, and the motor is connected to the input transmission member 5 in a transmission manner.

[0096] It can be understood that the two half shafts 20 are connected to the differential 27 in the planetary reducer assembly 2. The drive axle 100 further includes: two hub assemblies 40 arranged in the first direction, and the two half shafts 20 respectively transmit power to the two hub assemblies 40. The drive axle 100 further includes: two brake assemblies 50, and the brake assemblies 50 are used to input braking power to the hub assemblies 40.

[0097] According to the drive axle 100 of the embodiment of the present invention, by arranging the above-mentioned transmission assembly 10, the axes of the first bearing seat 11 and the second bearing seat 12 coincide; the first bearing 3 is arranged on the first bearing seat 11, the second bearing 4 is arranged on the second bearing seat 12, and the planetary reducer assembly 2 is arranged in the transmission housing 1. The planetary reducer assembly 2 includes a ring gear 21, and the ring gear 21 is rotatably supported by the first bearing 3; the input transmission member 5 is arranged in the transmission housing 1, and the input transmission member 5 is rotatably supported by the second bearing 4, so that the first bearing seat 11, the second bearing seat 12 and the transmission housing 1 are designed as a common housing, thereby improving the coaxiality of the axes between the rotating bodies such as the first bearing 3, the second bearing 4, the planetary reducer assembly 2 and the input transmission member 5, and improving the structural stiffness of the transmission housing 1, and also improving the support reliability for the rotating bodies such as the first bearing 3, the second bearing 4, the planetary reducer assembly 2 and the input transmission member 5, thereby improving the NVH performance.

[0098] In some embodiments of the present invention, as Figures 1 - 7 shown, the motor assembly 30 further includes a motor housing, and the motor housing and the transmission housing 1 are an integral part. Thus, the structural stiffness of the transmission housing 1 is further improved.

[0099] The vehicle according to the embodiment of the present invention will be described below.

[0100] The vehicle according to the embodiment of the present invention includes the above-mentioned drive axle 100.

[0101] A vehicle according to an embodiment of the present invention, by providing the above-described drive axle 100 and the above-described transmission assembly 10, the axes of the first bearing seat 11 and the second bearing seat 12 coincide; the first bearing 3 is provided in the first bearing seat 11, the second bearing 4 is provided in the second bearing seat 12, the planetary reducer assembly 2 is provided in the transmission housing 1, and the planetary reducer assembly 2 includes a ring gear 21 which is rotatably supported by the first bearing 3; the input transmission member 5 is provided in the transmission housing 1 and is rotatably supported by the second bearing 4, so that the first bearing seat 11, the second bearing seat 12 and the transmission housing 1 are designed with a common housing, thereby improving the coaxiality of the axes between the rotating bodies such as the first bearing 3, the second bearing 4, the planetary reducer assembly 2 and the input transmission member 5, and improving the structural stiffness of the transmission housing 1, and also improving the support reliability for the rotating bodies such as the first bearing 3, the second bearing 4, the planetary reducer assembly 2 and the input transmission member 5, thereby improving the NVH performance. In the description of the present specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In the present specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0102] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A transmission assembly, characterized in that, Comprising: A transmission housing having a first bearing seat and a second bearing seat spaced apart in a first direction, the axes of the first bearing seat and the second bearing seat coinciding; A first bearing provided in the first bearing seat; A second bearing provided in the second bearing seat; A planetary reducer assembly provided in the transmission housing, the planetary reducer assembly including a ring gear rotatably supported by the first bearing; An input transmission member provided in the transmission housing, the input transmission member rotatably supported by the second bearing, and the planetary reducer assembly being in driving connection with the input transmission member.

2. The transmission assembly according to claim 1, wherein The number of the second bearing seats is two, the two second bearing seats being spaced apart in the first direction, the number of the second bearings being two and corresponding to the two second bearing seats one by one, and both ends of the input transmission member in the first direction being respectively supported by the two second bearings.

3. The transmission assembly according to claim 1, characterized in that, The transmission housing further has an annular planetary mounting seat coaxially arranged with the first bearing seat and the second bearing seat, and the planetary reducer assembly further includes a planetary fixing frame connected to the planetary mounting seat.

4. The transmission assembly according to claim 3, characterized in that, In the first direction, the planetary mounting seat is provided between the first bearing seat and the second bearing seat.

5. The transmission assembly according to claim 1, wherein The planetary reducer assembly further includes: A sun gear connected to the input transmission member; A planetary fixing frame fixedly relative to the transmission housing; A planet carrier rotatably provided on the planetary fixing frame; A plurality of planet gears rotatably provided on the planet carrier, the plurality of planet gears being arranged radially outside the sun gear and meshing with the sun gear, and the ring gear being sleeved outside the plurality of planet gears and meshing with the plurality of planet gears internally.

6. The transmission assembly according to claim 5, wherein, The planetary reducer assembly further includes a shifting assembly fixed to the planet carrier, the shifting assembly having a first state and a second state. In the first state, the shifting assembly is fixedly relative to the planetary fixing frame, and in the second state, the shifting assembly is separated from the planetary fixing frame.

7. The transmission assembly according to claim 6, wherein The planetary fixing frame has a first limiting member, and the shifting assembly includes a fixing member and a gear position member. The fixing member is fixed to the planet carrier, and the gear position member is movable relative to the fixing member between a first position and a second position. In the first position, the gear position member is connected to the first limiting member, and the shifting assembly is switched to the first state; in the second position, the gear position member is separated from the first limiting member, and the shifting assembly is switched to the second state.

8. The transmission assembly according to claim 7, wherein, The planet carrier includes a bracket portion and a first shaft portion, the planet gears being provided on the bracket portion, and the first shaft portion being connected to the bracket portion and extending in the first direction. The fixing member extends circumferentially along the first shaft portion to form a ring and is sleeved and fixed outside the first shaft portion.

9. The transmission assembly according to claim 7, wherein, The planetary fixing frame and the shifting assembly are arranged in the first direction, and the shifting member is movably disposed on the fixing member between the first position and the second position along the first direction.

10. The transmission assembly according to claim 9, wherein, The fixing member and the shifting member are both annular in shape, and the shifting member is sleeved on the outer side of the fixing member, a first limiting protrusion is provided on the inner peripheral wall of the shifting member, and a first limiting groove extending along the first direction is provided on the outer peripheral wall of the fixing member, the first limiting protrusion is matched with the first limiting groove, and can slide relative to the first limiting groove along the first direction.

11. The transmission assembly according to claim 10, wherein, A second limiting groove extending along the first direction is provided on the outer peripheral wall of the first limiting member. When the stop member is in the first position, a part of the first limiting protrusion fits in the second limiting groove, and another part fits in the first limiting groove.

12. The transmission assembly according to claim 1, wherein, Also includes: An output transmission assembly, one end of which is transmission-connected to the input transmission member, and the other end of which is suitable for transmission-connection to the motor.

13. The transmission assembly according to claim 12, wherein The output transmission assembly is a gear transmission assembly, the input transmission member is a gear member, and the output transmission assembly includes: A first gear, a second gear and a third gear, wherein the first gear is suitable for being drivingly connected to the motor shaft of the motor, the second gear and the third gear are coaxially fixed, the second gear is meshed with the first gear, and the third gear is meshed with the input transmission member.

14. The transmission assembly according to claim 12, wherein The transmission housing is provided with a partition to divide the space in the transmission housing into a first cavity and a second cavity. The planetary reducer assembly, the first bearing seat, the second bearing seat and the input transmission component are all located in the first cavity, and the output transmission component is arranged in the second cavity.

15. The transmission assembly according to claim 14, characterized in that, The transmission housing is formed with a first oil injection hole and a second oil injection hole connected to the oil pump, the first oil injection hole is connected to the first cavity, and the second oil injection hole is connected to the second cavity. The partition plate is provided with an oil return hole, and the transmission housing is configured to allow the oil in the first cavity to flow to the second cavity through the oil return hole under the action of gravity.

16. The transmission assembly according to claim 15, characterized in that, The highest height of the oil at the bottom of the second cavity is lower than the lowest position of the output transmission assembly.

17. The transmission assembly according to claim 15, wherein, The oil return hole is located at the bottom of the first cavity, and a one-way valve is provided in the oil return hole for controlling the one-way flow of oil from the first cavity to the second cavity.

18. The transmission assembly according to claim 15, characterized in that, The oil return hole is located at the bottom of the first cavity, and the lowest point of the first cavity is higher than the highest height of the oil at the bottom of the second cavity.

19. The transmission assembly according to claim 15, characterized in that, Also includes: A filter, wherein an inlet of the filter is communicated with an outlet of the oil pump.

20. The transmission assembly according to claim 19, characterized in that, The filter comprises a coarse filter and a fine filter which are connected in series in sequence, and the coarse filter is connected to a side of the fine filter facing the oil pump inlet.

21. The transmission assembly according to claim 19, wherein, Also includes: An oil cooler is communicated with the filter and is located on a side of the filter away from the oil pump along the oil flow direction.

22. The transmission assembly according to claim 15, wherein, The inner wall surface of the first cavity is an arc surface; And / or, the inner wall surface of the second cavity is an arc surface.

23. A drive axle, characterized in that, include: The transmission assembly according to any one of claims 1 to 22; Two half shafts, the two half shafts extending along the first direction and arranged at intervals along the first direction, the facing ends of the two half shafts both extending into the transmission housing and respectively connected to the planetary reducer assembly in driving connection; A motor assembly, wherein the motor assembly comprises a motor, and the motor is drivingly connected to the input transmission member.

24. The drive axle according to claim 23, wherein, The motor assembly further includes a motor housing, and the motor housing and the transmission housing are an integrated piece.

25. A vehicle, characterized in that, Comprising a drive axle according to claim 23 or 24.

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