An electric drive transmission, an electric drive system and a vehicle

Abstract

The utility model provides a kind of electric drive transmission device, electric drive system and vehicle, it is related to vehicle technical field, electric drive transmission device includes the shell with via hole, the transmission shaft being located in shell and being inserted in via hole, the first support bearing of being sleeved in transmission shaft and being located in via hole and the elastic member being located in via hole;Via hole is equipped with the first limit boss and the second limit boss being arranged along axial direction, elastic member is located between first support bearing and first limit boss along axial direction, to buffer the movement of first support bearing relative to via hole along axial direction, the second limit boss is between first support bearing and first limit boss, to be used for the movement of first support bearing to the end close to elastic member is positioned. Thus, not only can reduce the extrusion force of first support bearing to elastic member, prolong the service life of elastic member, electric drive system can also improve the comfort performance under abnormal impact working condition.

Description

Technical Field

[0001] This utility model relates to the field of vehicle technology, and more specifically, to an electric drive transmission device, an electric drive system, and a vehicle. Background Technology

[0002] In electric drive systems, a motor bearing is typically installed at each end of the motor shaft to support the motor shaft and rotor, and a support bearing is also installed at each end of the input shaft of the reducer to support the input shaft. In related technologies, considering cost, the motor bearing near the input shaft is eliminated, and the motor shaft is inserted into the inner hole of the input shaft to utilize the input shaft for support. Simultaneously, a wave spring is installed at the end of the motor shaft furthest from the input shaft to axially limit the motor bearing, and the stepped surface of the motor shaft at the end closest to the input shaft abuts against the stepped surface of the input shaft for axial limitation.

[0003] However, under complex abnormal impact conditions, such as rapidly pressing the accelerator pedal (i.e., tip in) or rapidly releasing the accelerator pedal (i.e., tip out), the motor shaft will be subjected to abnormal axial impact, resulting in a large axial displacement space of the wave spring, or even severe compression, which leads to a reduction in the life of the wave spring and also reduces the comfort performance of the electric drive system under abnormal impact conditions. Utility Model Content

[0004] The problem this invention addresses is: how to improve the service life of wave springs and the comfort of electric drive systems under abnormal impact conditions.

[0005] To address the aforementioned problems, this utility model provides an electric drive transmission device, an electric drive system, and a vehicle.

[0006] In a first aspect, the present invention provides an electric drive transmission device, including a housing, a drive shaft, a first support bearing, and an elastic element. The drive shaft is disposed inside the housing, the first support bearing is sleeved on the drive shaft, the housing is provided with a through hole for the drive shaft to pass through, and the first support bearing and the elastic element are arranged in the through hole along the axial direction of the drive shaft. The through hole is provided with a first limiting boss and a second limiting boss arranged axially. The elastic element is arranged axially between the first support bearing and the first limiting boss to buffer the axial movement of the first support bearing relative to the through hole. The second limiting boss is located between the first support bearing and the first limiting boss to limit the movement of the first support bearing toward the end closer to the elastic element.

[0007] Optionally, the two axial ends of the elastic member are respectively axially abutted with the first support bearing and the first limiting boss, and the second limiting boss is used to abut with the end face of the first support bearing near the end of the elastic member.

[0008] Optionally, the electric drive transmission device further includes a steel sleeve, which is fixed in the through hole and sleeved on the outside of the first support bearing. The first limiting boss is provided on the hole wall of the through hole, and the second limiting boss is provided on the circumferential inner wall of the steel sleeve.

[0009] Optionally, the steel sleeve is provided with a third limiting boss, which is located between the first limiting boss and the second limiting boss, and the end face of the elastic member away from the first support bearing abuts against the third limiting boss.

[0010] Optionally, the electric drive transmission device further includes a steel sleeve located within the through hole. The first support bearing is fixed in the inner hole of the steel sleeve. The first limiting boss and the second limiting boss are respectively disposed on the hole wall of the through hole, and the second limiting boss is used to abut against the end face of the steel sleeve near the elastic member.

[0011] Optionally, the steel sleeve is provided with a fourth limiting boss, which is located between the second limiting boss and the first support bearing, and the two axial ends of the elastic member respectively form axial abutments with the first limiting boss and the fourth limiting boss.

[0012] Optionally, the circumferential outer wall of the elastic member includes a first outer wall and a second outer wall distributed along the axial direction, the first outer wall being in contact with the second limiting boss, and the second outer wall being spaced apart from the second limiting boss.

[0013] Optionally, the first outer wall is located on the side of the second outer wall away from the first support bearing.

[0014] Secondly, this utility model provides an electric drive system, including the electric drive transmission device as described above.

[0015] Thirdly, this utility model provides a vehicle including the electric drive system described above.

[0016] The beneficial effects of the electric drive transmission device of this utility model are as follows: by providing a through hole on the housing for the transmission shaft to pass through, the transmission shaft can be easily connected to other components through the through hole to transmit torque. Moreover, by providing a first limiting boss in the through hole, and by forming axial abutments between the axial ends of the elastic element provided in the through hole and the first limiting boss and the first support bearing sleeved on one end of the transmission shaft, when the transmission shaft undergoes axial displacement due to uneven road surface during normal vehicle operation, the elastic element can be used to axially buffer and limit the transmission shaft, thereby reducing the vibration excitation source of the electric drive transmission device. Meanwhile, by setting a second limiting boss inside the through hole and positioning the second limiting boss between the first support bearing and the first limiting boss, when the drive shaft is subjected to abnormal impact and violently displaces along with the first support bearing toward the elastic element, the second limiting boss can be used to limit the axial displacement of the first support bearing. This prevents the elastic element from being severely squeezed due to excessive axial displacement of the first support bearing. This not only reduces the squeezing force of the first support bearing on the elastic element and extends the service life of the elastic element, but also improves the comfort performance of the electric drive system under abnormal impact conditions. Attached Figure Description

[0017] Figure 1 This is a cross-sectional schematic diagram of the electric drive transmission device in an embodiment of this utility model; Figure 2 for Figure 1 Enlarged view of a portion of point A in the middle; Figure 3 This is a cross-sectional schematic diagram of another case of the electric drive transmission device in the embodiments of this utility model; Figure 4 for Figure 3 Enlarged view of a section at point B in the middle; Figure 5 for Figure 3 A magnified view of another scenario at point B; Figure 6 This is a cross-sectional schematic diagram of another embodiment of the electric drive transmission device in this utility model. Figure 7 for Figure 6 Enlarged view of a section at point C; Figure 8 for Figure 6 A magnified view of another scenario at point C; Figure 9 This is a partial cross-sectional view of the electric drive transmission device at the elastic member in an embodiment of this utility model.

[0018] Explanation of reference numerals in the attached figures: 1. Housing; 11. Housing body; 12. Cover plate; 13. Through hole; 14. Cavity; 2. Drive shaft; 21. Shaft step surface; 3. First support bearing; 4. Elastic element; 41. First outer wall; 42. Second outer wall; 5. Steel sleeve; 61. First limiting boss; 62. Second limiting boss; 63. Third limiting boss; 64. Fourth limiting boss; 7. Input shaft. Detailed Implementation

[0019] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Although some embodiments of this utility model are shown in the drawings, it should be understood that this utility model can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this utility model. It should be understood that the drawings and embodiments of this utility model are for illustrative purposes only and are not intended to limit the scope of protection of this utility model.

[0020] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; and the term "optionally" means "optional embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first," "second," etc., mentioned in this utility model are only used to distinguish different devices, modules, or units, and are not used to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0021] It should be noted that the terms "one" and "multiple" used in this utility model are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0022] In related technologies, a motor bearing is typically installed at each end of the motor shaft to support the motor shaft and rotor, and a support bearing is also installed at each end of the input shaft of the reducer to support the input shaft. Considering cost, the motor bearing near the input shaft is eliminated, and the motor shaft is inserted into the inner hole of the input shaft to utilize the input shaft for support. Simultaneously, a wave spring is installed at the end of the motor shaft furthest from the input shaft to axially limit the motor bearing, and the stepped surface of the motor shaft near the input shaft abuts against the stepped surface of the input shaft for axial limitation. However, under complex abnormal impact conditions, such as rapidly pressing or releasing the accelerator pedal, the motor shaft will experience abnormal axial impact, resulting in a large axial displacement space for the wave spring, or even severe compression, leading to a reduction in the lifespan of the wave spring and a decrease in the comfort performance of the electric drive system under abnormal impact conditions.

[0023] To address the problems existing in the aforementioned related technologies, this utility model provides an electric drive transmission device, an electric drive system, and a vehicle.

[0024] Combination Figure 1 and Figure 2 As shown, an electric drive transmission device according to an embodiment of the present invention includes a housing 1, a transmission shaft 2, a first support bearing 3 and an elastic element 4. The transmission shaft 2 is disposed inside the housing 1, the first support bearing 3 is sleeved on the transmission shaft 2, the housing 1 is provided with a through hole 13 for the transmission shaft 2 to pass through, and the first support bearing 3 and the elastic element 4 are arranged in the through hole 13 along the axial direction of the transmission shaft 2. The through hole 13 is provided with a first limiting boss 61 and a second limiting boss 62 arranged axially. The elastic member 4 is arranged axially between the first support bearing 3 and the first limiting boss 61 to buffer the axial movement of the first support bearing 3 relative to the through hole 13. The second limiting boss 62 is located between the first support bearing 3 and the first limiting boss 61 to limit the movement of the first support bearing 3 towards the end closer to the elastic member 4.

[0025] It should be noted that the electric drive transmission device is a device in an electric drive system used to convert electrical energy into mechanical energy and transmit it to the drive wheels of a vehicle. It mainly includes a motor and a reducer, and the drive shaft 2 can be the motor shaft, or it can be the input shaft 7 or the output shaft of the reducer, for example... Figure 1 An example is given where drive shaft 2 is the motor shaft.

[0026] It should also be noted that at least one end of the drive shaft 2 is provided with a support bearing. When both ends of the drive shaft 2 are provided with support bearings, the support bearing at one end of the drive shaft 2 is the first support bearing 3, and the support bearing at the other end of the drive shaft 2 is the second support bearing; when only one end of the drive shaft 2 is provided with a support bearing, such as Figure 1 As shown, the support bearing is the first support bearing 3.

[0027] Specifically, for non-integrated electric drive systems, the motor housing and the reducer housing are not shared; in this case, housing 1 can be either the motor housing or the reducer housing. For integrated electric drive systems, such as two-in-one or three-in-one systems, such as... Figure 1 As shown, the motor and reducer share an integrated housing, in which case housing 1 is the integrated housing. Housing 1 has a through hole 13, through which one end of the drive shaft 2 passes. For example, when housing 1 is an integrated housing, the through hole 13 can be located on the end cap of the integrated housing, or it can be located in the middle section of the integrated housing (i.e., a partition structure that divides the internal space of the integrated housing into a motor cavity and a reducer cavity). Furthermore, an elastic element 4 is provided within the through hole 13. The elastic element 4 can be a ring-shaped component with a certain elasticity, such as a wave spring. In this case, the elastic element 4 can be sleeved on the drive shaft 2, and the elastic element 4 and the first support bearing 3 sleeved on one end of the drive shaft 2 are arranged axially along the drive shaft 2 within the through hole 13.

[0028] More specifically, the through hole 13 is provided with a first limiting boss 61 and a second limiting boss 62 arranged axially. The first limiting boss 61 and the second limiting boss 62 can be a complete annular boss structure, or they can be composed of multiple boss structures spaced apart circumferentially along the drive shaft 2. The first limiting boss 61 is located on the wall of the through hole 13, forming an integral connection between the first limiting boss 61 and the housing 1. The second limiting boss 62 can be located on the wall of the through hole 13, such as... Figure 2 , Figure 7 and Figure 8 As shown, it can also be installed on the circumferential inner wall of the steel sleeve 5 (described later) located within the through hole 13, such as... Figure 4 and Figure 5 As shown. That is, the second limiting boss 62 can be integrally connected to the housing 1 or integrally connected to the steel sleeve 5. The second limiting boss 62 and the elastic member 4 are located between the first limiting boss 61 and the first support bearing 3, and the elastic member 4 is located within the area enclosed by the second limiting boss 62, which is equivalent to the second limiting boss 62 being sleeved outside the elastic member 4. Wherein, when the steel sleeve 5 is not provided in the through hole 13, as... Figure 2 As shown, the two axial ends of the elastic element 4 form axial abutments with the first support bearing 3 and the first limiting boss 61, respectively; when the steel sleeve 5 is fixed in the through hole 13, as Figure 4 As shown, the two axial ends of the elastic element 4 can respectively form axial abutments with the first support bearing 3 and the first limiting boss 61, or they can respectively form axial abutments with the first support bearing 3 and the steel sleeve 5, as shown. Figure 5As shown; when the steel sleeve 5 is fixed on the first support bearing 3 and located within the through hole 13, as Figure 7 As shown, the two axial ends of the elastic element 4 can respectively form axial abutments with the first support bearing 3 and the first limiting boss 61, or they can respectively form axial abutments with the first limiting boss 61 and the steel sleeve 5, as shown. Figure 8 As shown.

[0029] In this embodiment, a through hole 13 for the transmission shaft 2 to pass through can be provided on the housing 1 to facilitate the transmission shaft 2 to pass through the through hole 13 and connect with other components to transmit torque. Moreover, by providing a first limiting boss 61 in the through hole 13 and placing an elastic member 4 in the through hole 13 between the first limiting boss 61 and the first support bearing 3 sleeved on the transmission shaft 2, when the transmission shaft 2 undergoes axial displacement due to uneven road surface during normal vehicle operation, the elastic member 4 can be used to buffer and limit the transmission shaft 2 axially, thereby reducing the vibration excitation source of the electric drive transmission device. Meanwhile, by providing a second limiting boss 62 within the through hole 13 and positioning the second limiting boss 62 between the first support bearing 3 and the first limiting boss 61, the movement of the first support bearing 3 toward the end closer to the elastic member 4 is limited. Thus, when the drive shaft 2 is subjected to abnormal impact and violently displaces along with the first support bearing 3 toward the direction closer to the elastic member 4, the second limiting boss 62 can be used to limit the axial displacement of the first support bearing 3, preventing the elastic member 4 from being severely squeezed due to excessive axial displacement of the first support bearing 3. This not only reduces the squeezing force of the first support bearing 3 on the elastic member 4 and extends the service life of the elastic member 4, but also improves the comfort performance of the electric drive system under abnormal impact conditions.

[0030] Optionally, combined Figure 1 and Figure 2 As shown, the two ends of the elastic member 4 form axial abutments with the first support bearing 3 and the first limiting boss 61 respectively, and the second limiting boss 62 is used to abut with the end face of the first support bearing 3 near the end of the elastic member 4.

[0031] In this optional embodiment, in the initial state, there is a small axial gap between the second limiting boss 62 and the first support bearing 3. When the drive shaft 2 is subjected to abnormal impact, the drive shaft 2 will move axially with the first support bearing 3 to squeeze the elastic member 4 until the end face of the first support bearing 3 near the elastic member 4 abuts against the second limiting boss 62, thereby preventing the first support bearing 3 from continuing to squeeze the elastic member 4. In this way, the squeezing force on the elastic member 4 is reduced, and the service life of the elastic member 4 is extended.

[0032] Furthermore, combined Figure 1 , Figure 3 and Figure 6As shown, the housing 1 includes a housing body 11 and a cover plate 12. The cover plate 12 is connected to one end of the housing body 11 and forms a cavity 14 with the housing body 11 for accommodating the drive shaft. A through hole 13 is provided in the cover plate 12. The cover plate 12 is an end plate at one end of the housing 1, and its connection to the housing body 11 can be integral or detachable. The through hole 13 is axially penetrating through the cover plate 12. For example, Figure 1 The example given is that the housing 1 is a split structure. In this case, the cover plate 12 and the housing body 11 are detachably connected by fasteners such as bolts, so as to facilitate the disassembly and assembly of the housing 1 and its segmented manufacturing.

[0033] Optionally, combined Figure 3 and Figure 4 As shown, the electric drive transmission device also includes a steel sleeve 5, which is fixed inside the through hole 13 and sleeved outside the first support bearing 3. The first limiting boss 61 is provided on the hole wall of the through hole 13, and the second limiting boss 62 is provided on the circumferential inner wall of the steel sleeve 5.

[0034] In this optional embodiment, the steel sleeve 5 is fixedly disposed within the through hole 13. The steel sleeve 5 and the through hole 13 can be fixedly connected by means such as an interference fit, i.e., the steel sleeve 5 is fixed within the through hole 13 and does not move. The first limiting boss 61 is disposed on the hole wall of the through hole 13, and the second limiting boss 62 is disposed on the circumferential inner wall of the steel sleeve 5. Simultaneously, the steel sleeve 5 is sleeved outside the first support bearing 3, such that the first support bearing 3 contacts the circumferential inner wall of the steel sleeve 5 and can move axially relative to the steel sleeve 5. Alternatively, the steel sleeve 5 can be sleeved only outside the first support bearing 3. In this case, the steel sleeve 5 and the first limiting boss 61 are spaced apart axially, and the axial dimension of the steel sleeve 5 can be slightly larger than or approximately the same as the axial dimension of the first support bearing 3. The steel sleeve 5 can also be sleeved outside both the first support bearing 3 and the elastic member 4. In this case, such as... Figure 4 As shown, the steel sleeve 5 and the first limiting boss 61 can form an axial abutment or have a gap, and the axial dimension of the steel sleeve 5 is approximately equal to the sum of the axial dimensions of the first support bearing 3 and the elastic element 4.

[0035] Thus, when the drive shaft 2 experiences high-frequency axial vibration due to the vehicle traveling on complex road conditions, the steel sleeve 5, fixedly installed within the through hole 13, prevents the first support bearing 3 from directly contacting the hole wall of the through hole 13, thereby avoiding friction between the first support bearing 3 and the hole wall of the through hole 13. This prevents wear on the hole wall of the through hole 13 due to friction and extends the service life of the housing 1. Furthermore, the second limiting boss 62 is positioned on the circumferential inner wall of the steel sleeve 5 to limit large axial displacement of the first support bearing 3 when it moves axially relative to the circumferential inner wall of the steel sleeve 5, thereby preventing the first support bearing 3 from severely compressing the elastic element 4.

[0036] Optionally, combined Figure 3 and Figure 5 As shown, the steel sleeve 5 is provided with a third limiting boss 63, which is located between the first limiting boss 61 and the second limiting boss 62. The end face of the elastic member 4 away from the first support bearing 3 abuts against the third limiting boss 63.

[0037] In this optional embodiment, the steel sleeve 5 is fixed within the through hole 13, and the circumferential inner wall of the steel sleeve 5 is provided with a second limiting boss 62 and a third limiting boss 63. The third limiting boss 63 is located on the side of the second limiting boss 62 away from the first supporting bearing 3, and there can be a gap between the third limiting boss 63 and the first limiting boss 61, or they can form an axial abutment. In practical applications, such as... Figure 5 As shown, the third limiting boss 63 is typically chosen to form an axial abutment with the first limiting boss 61. This reduces the wall thickness of the housing 1 at the through hole 13, lowering the production cost of the housing 1. Furthermore, the first limiting boss 61 provides positioning and limiting for the installation of the steel sleeve 5, improving the ease of installation. Simultaneously, the steel sleeve 5 is fitted over the elastic member 4, which can move axially relative to the steel sleeve 5. The end face of the elastic member 4, away from the first support bearing 3, abuts against the third limiting boss 63. This prevents the elastic member 4 from directly contacting the first limiting boss 61 on the hole wall of the through hole 13, preventing friction between the elastic member 4 and the first limiting boss 61. This prevents wear on the first limiting boss 61 due to friction, further extending the service life of the housing 1.

[0038] Optionally, combined Figure 6 and Figure 7 As shown, the electric drive transmission device also includes a steel sleeve 5, which is located inside the through hole 13. The first support bearing 3 is fixed in the inner hole of the steel sleeve 5. The first limiting boss 61 and the second limiting boss 62 are respectively provided on the hole wall of the through hole 13, and the second limiting boss 62 is used to abut against the end face of the steel sleeve 5 near the elastic member 4.

[0039] In this optional embodiment, the steel sleeve 5 is fixed to the first support bearing 3 by fixing the first support bearing 3 in the inner hole of the steel sleeve 5, so that the steel sleeve 5 can move axially relative to the hole wall of the through hole 13 together with the first support bearing 3. The fixed connection between the first support bearing 3 and the steel sleeve 5 can be achieved by press-fitting the outer ring of the steel sleeve 5 and the first support bearing 3 into one piece. Furthermore, both the first limiting boss 61 and the second limiting boss 62 are provided on the hole wall of the through hole 13. The end of the elastic member 4 away from the first limiting boss 61 can abut against the first support bearing 3 or against the steel sleeve 5; no specific limitation is made here. In the initial state, there is a small axial gap between the second limiting boss 62 and the steel sleeve 5. When the drive shaft 2 is subjected to abnormal impact, the drive shaft 2 will move axially together with the first support bearing 3 and the steel sleeve 5 to squeeze the elastic element 4 until the steel sleeve 5 and the second limiting boss 62 form an axial contact, that is, the end face of the steel sleeve 5 near the elastic element 4 abuts against the second limiting boss 62.

[0040] In this way, by fixing the first support bearing 3 in the inner hole of the steel sleeve 5, the steel sleeve 5 is fixed on the first support bearing 3, thereby increasing the load on the drive shaft 2 during axial movement, reducing the probability of the drive shaft 2 vibrating violently, and thus reducing the squeezing force of the first support bearing 3 or the steel sleeve 5 on the elastic element 4, extending the service life of the elastic element 4, and further improving the comfort performance of the electric drive system under abnormal impact conditions. In addition, the first limiting boss 61 and the second limiting boss 62 are respectively provided on the hole wall of the through hole 13, so that when the first support bearing 3 and the steel sleeve 5 move axially with the drive shaft 2 relative to the hole wall of the through hole 13, the second limiting boss 62 can be used to limit the large axial displacement of the steel sleeve 5, thereby avoiding the first support bearing 3 or the steel sleeve 5 from severely squeezing the elastic element 4.

[0041] Optionally, combined Figure 6 and Figure 8 As shown, the steel sleeve 5 is provided with a fourth limiting boss 64, which is located between the second limiting boss 62 and the first support bearing 3. The axial ends of the elastic element 4 are respectively axially abutted against the first limiting boss 61 and the fourth limiting boss 64. This avoids direct contact between the elastic element 4, which has a certain stiffness (e.g., a wave spring), and the first support bearing 3. On the one hand, it prevents the elastic element 4 from wearing down the first support bearing 3; on the other hand, it increases the contact area between the elastic element 4 and the steel sleeve 5, facilitating the use of a lower stiffness elastic element 4 to engage with the fourth limiting boss 64 for axial buffering and limiting of the drive shaft 2. This reduces the weight and production cost of the elastic element 4.

[0042] Furthermore, combined Figure 8As shown, a receiving cavity for accommodating rolling elements is formed between the outer and inner rings of the first support bearing 3. The fourth limiting boss 64 does not obstruct or partially obstructs the axial opening of this receiving cavity. This is to prevent the fourth limiting boss 64 from blocking lubricating oil from flowing into the receiving cavity for lubrication.

[0043] Optionally, combined Figure 9 As shown, the circumferential outer wall of the elastic member 4 includes a first outer wall 41 and a second outer wall 42 distributed along the axial direction. The first outer wall 41 is in contact with the second limiting boss 62, and the second outer wall 42 is spaced apart from the second limiting boss 62.

[0044] It should be noted that the elastic element 4 can be, for example, a wave spring or a ring-shaped elastic washer, etc. Figure 9 An example is given where the elastic element 4 is a wave spring.

[0045] In this way, the contact area of ​​the elastic element 4 can be increased by utilizing the contact between the first outer wall 41 and the second limiting boss 62, thereby increasing the friction between the elastic element 4 and the second limiting boss 62, so that the elastic element 4 can better provide axial support force to overcome the impact force, thus playing a better buffering role.

[0046] In practical applications, a transition fit is formed between the first outer wall 41 and the second limiting boss 62. Specifically, the portion corresponding to the first outer wall 41 of the elastic member 4 forms a transition fit with the cavity enclosed by the annular second limiting boss 62. That is, during assembly, a small clearance fit or an interference fit may be formed between the first outer wall 41 of the elastic member 4 and the second limiting boss 62. Conversely, a clearance fit is formed between the second outer wall 42 of the elastic member 4 and the cavity enclosed by the annular second limiting boss 62. During assembly, there is a gap between the second outer wall 42 of the elastic member 4 and the second limiting boss 62.

[0047] Optionally, combined Figure 9 As shown, the first outer wall 41 is located on the side of the second outer wall 42 away from the first support bearing 3. That is, the first outer wall 41 is located at the end of the elastic member 4 away from the first support bearing 3. Compared with setting the first outer wall 41 in the middle of the elastic member 4, this facilitates the manufacturing of the elastic member 4 and improves the structural strength of the end of the elastic member 4 away from the first support bearing 3, so as to better provide axial support force.

[0048] Optionally, combined Figure 2 , Figure 4 and Figure 7As shown, the drive shaft 2 is provided with a stepped surface 21, and the end face of the first support bearing 3 away from the elastic element 4 abuts against the stepped surface 21. In this way, when the first support bearing 3 is installed on the drive shaft 2, the stepped surface 21 on the drive shaft 2 can be used to axially limit and position the first support bearing 3, thereby improving the convenience of assembling the first support bearing 3.

[0049] An electric drive system according to an embodiment of the present invention includes the electric drive transmission device as described above.

[0050] The beneficial effects of the electric drive system in this embodiment are the same as those of the electric drive transmission device described above, and will not be repeated here.

[0051] A vehicle according to an embodiment of the present invention includes the electric drive system described above.

[0052] The beneficial effects of the vehicle in this embodiment are the same as those of the electric drive system described above, and will not be repeated here.

[0053] Although the present invention has been disclosed above, its protection scope is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the protection scope of the present invention.

Claims

1. An electric drive transmission device, characterized in that, The device includes a housing (1), a drive shaft (2), a first support bearing (3), and an elastic element (4). The drive shaft (2) is disposed inside the housing (1), and the first support bearing (3) is sleeved on the drive shaft (2). The housing (1) is provided with a through hole (13) for the drive shaft (2) to pass through. The first support bearing (3) and the elastic element (4) are arranged in the through hole (13) along the axial direction of the drive shaft (2). The through hole (13) is provided with a first limiting boss (61) and a second limiting boss (62) arranged axially. The elastic member (4) is arranged axially between the first support bearing (3) and the first limiting boss (61) to buffer the axial movement of the first support bearing (3) relative to the through hole (13). The second limiting boss (62) is located between the first support bearing (3) and the first limiting boss (61) to limit the movement of the first support bearing (3) towards the end closer to the elastic member (4).

2. The electric drive transmission device according to claim 1, characterized in that, The two ends of the elastic member (4) are respectively axially abutted with the first support bearing (3) and the first limiting boss (61), and the second limiting boss (62) is used to abut with the end face of the first support bearing (3) near the end of the elastic member (4).

3. The electric drive transmission device according to claim 1, characterized in that, It also includes a steel sleeve (5), which is fixed in the through hole (13) and sleeved on the outside of the first support bearing (3). The first limiting boss (61) is provided on the hole wall of the through hole (13), and the second limiting boss (62) is provided on the circumferential inner wall of the steel sleeve (5).

4. The electric drive transmission device according to claim 3, characterized in that, The steel sleeve (5) is provided with a third limiting boss (63), which is located between the first limiting boss (61) and the second limiting boss (62). The end face of the elastic member (4) away from the first support bearing (3) abuts against the third limiting boss (63).

5. The electric drive transmission device according to claim 1, characterized in that, It also includes a steel sleeve (5), which is located inside the through hole (13). The first support bearing (3) is fixed in the inner hole of the steel sleeve (5). The first limiting boss (61) and the second limiting boss (62) are respectively provided on the hole wall of the through hole (13), and the second limiting boss (62) is used to abut against the end face of the steel sleeve (5) near the elastic member (4).

6. The electric drive transmission device according to claim 5, characterized in that, The steel sleeve (5) is provided with a fourth limiting boss (64), which is located between the second limiting boss (62) and the support bearing (3), and the two ends of the elastic member (4) are respectively axially abutted against the first limiting boss (61) and the fourth limiting boss (64).

7. The electric drive transmission device according to claim 1, characterized in that, The circumferential outer wall of the elastic element (4) includes a first outer wall (41) and a second outer wall (42) distributed along the axial direction. The first outer wall (41) is in contact with the second limiting boss (62), and the second outer wall (42) is spaced apart from the second limiting boss (62).

8. The electric drive transmission device according to claim 7, characterized in that, The first outer wall (41) is located on the side of the second outer wall (42) away from the first support bearing (3).

9. An electric drive system, characterized in that, Includes the electric drive transmission device as described in any one of claims 1 to 8.

10. A vehicle, characterized in that, Including the electric drive system as described in claim 9.

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