Electric drive assembly for vehicle and vehicle

Abstract

The utility model discloses a kind of electric drive assembly and vehicle for vehicle.The electric drive assembly according to the utility model includes: shell, speed reducer shaft, first bearing and limit plate, shell inside is formed with the installation cavity for installing bearing, installation cavity is opened in first direction to be set as open mouth;One end of speed reducer shaft is housed in installation cavity;First bearing is sleeved in one end of speed reducer shaft, one of first bearing and speed reducer shaft is provided with limit cooperation part, limit cooperation part respectively with first bearing and speed reducer shaft is stopped in axial direction;Limit plate is set on shell and at least part extends to the open mouth of installation cavity and is opposite with first bearing in first direction;Wherein, limit cooperation part and limit plate are respectively located on the two sides of first bearing in axial direction to limit first bearing movement in first direction and second direction respectively.The electric drive assembly according to the utility model is low in weight, simple in structure, and speed reducer shaft and motor shaft are good in stability, high in reliability.

Description

Technical Field

[0001] This utility model relates to the field of vehicles, and in particular to an electric drive assembly for vehicles and a vehicle. Background Technology

[0002] Currently, most electric vehicles employ a three-bearing structure in their electric drive systems to reduce size, weight, and cost. This means one bearing is removed from the connection between the motor shaft and the reducer input shaft. While mass-produced three-bearing structures typically omit one bearing on the motor shaft, the lack of support on one side makes the motor shaft prone to misalignment, posing a risk of bearing damage. In related technologies, a scheme using two bearings on the motor shaft and one on the reducer shaft avoids the motor shaft misalignment problem, but the reducer shaft bearing lacks a fixing structure, making it susceptible to displacement and potentially damaging the oil seals and other components of the electric drive assembly. Utility Model Content

[0003] This invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one objective of this invention is to provide an electric drive assembly for vehicles. The electric drive assembly according to this invention reduces the number of bearings on the reducer shaft, thereby reducing the complexity, weight, and cost of the electric drive assembly. Simultaneously, the limiting fit and limiting plate can axially limit the first bearing, ensuring the stability of the reducer shaft, avoiding oil seal damage caused by reducer shaft displacement, and improving the reliability and safety of the electric drive assembly.

[0004] This utility model also proposes a vehicle including the above-mentioned electric drive assembly.

[0005] The electric drive assembly according to this utility model includes: a housing, a reducer shaft, a first bearing, and a limiting plate. The housing has an internal mounting cavity for mounting the bearing, and the mounting cavity is open along a first direction to serve as an open opening. One end of the reducer shaft is received within the mounting cavity. The first bearing is sleeved on one end of the reducer shaft. A limiting fitting portion is provided on one of the first bearing and the reducer shaft, and the limiting fitting portion abuts against the first bearing and the reducer shaft axially, respectively. The limiting plate is disposed on the housing and extends at least partially to the open opening of the mounting cavity and is directly opposite the first bearing in the first direction. The limiting fitting portion and the limiting plate are respectively located on both sides of the first bearing axially to restrict the movement of the first bearing in the first and second directions, respectively.

[0006] The electric drive assembly of this invention features a first bearing on the reducer shaft. Compared to the traditional design with two bearings on the reducer shaft, this invention reduces the number of bearings, thereby reducing the complexity, weight, and cost of the electric drive assembly. The first bearing, mating with the inner wall of the mounting cavity, provides radial support to the reducer shaft. Simultaneously, the electric drive assembly uses a limiting fit and a limiting plate to limit the first bearing on both sides of the axial direction, restricting its movement and improving the stability of both the first bearing and the reducer shaft. This reduces friction, wear, and noise caused by bearing displacement, thus improving the overall performance and efficiency of the electric drive assembly. Furthermore, it prevents oil seal damage due to reducer shaft displacement, enhancing the reliability and safety of the electric drive assembly.

[0007] According to one embodiment of the present invention, the reducer shaft includes: a first shaft segment and a second shaft segment, the first shaft segment being used to connect a power unit; the second shaft segment being axially connected to the first shaft segment and having a smaller diameter than the first shaft segment, the first bearing being sleeved on the outer periphery of the second shaft segment, a first stepped surface being formed between the second shaft segment and the first shaft segment, the first stepped surface abutting against the first bearing in a first direction; and a limiting fitting portion being disposed on the second shaft segment, the limiting fitting portion being located on one side of the first bearing in a second direction and abutting against the first bearing in the second direction.

[0008] According to one embodiment of the present invention, the limiting fitting part is constructed as an elastic retaining ring sleeved on the second shaft segment.

[0009] According to one embodiment of the present invention, a limiting ring for abutting against the elastic retaining ring is formed on the outer periphery of one end of the second shaft segment.

[0010] According to one embodiment of the present invention, an annular limiting groove for receiving the elastic retaining ring is formed on the outer periphery of one end of the second shaft segment.

[0011] According to one embodiment of the present invention, the electric drive assembly further includes: a motor shaft and a second bearing, wherein the motor shaft is axially connected to the reducer shaft; the second bearing is disposed on the housing and sleeved on the outer periphery of the motor shaft to support the motor shaft to rotate on the housing.

[0012] According to one embodiment of the present invention, a socket is formed in the first shaft segment, the socket being open toward the other end of the first shaft segment, and at least a portion of the motor shaft is received in the socket; wherein, at least a portion of the inner wall of the socket is formed with an internal spline, and the outer periphery of the motor shaft is formed with an external spline that mates with the internal spline.

[0013] According to one embodiment of the present invention, the reducer shaft further includes a support shaft section, which is disposed at the other end of the first shaft section and sleeved on the outer periphery of the motor shaft, and the inner wall surface of the support shaft section is constructed with a smooth wall surface.

[0014] According to one embodiment of the present invention, the electric drive assembly further includes: a limiting plate fastener, the limiting plate fastener passing through the limiting plate and the housing respectively in the thickness direction of the limiting plate to fix the limiting plate to the housing.

[0015] The vehicle according to this utility model is briefly described below.

[0016] The vehicle according to this utility model includes the electric drive assembly in the above embodiments. Since the vehicle according to this utility model includes the electric drive assembly in the above embodiments, the number of bearings on the reducer shaft is reduced, the weight of the electric drive assembly is reduced, the structure is simpler, which is conducive to the lightweighting of the vehicle. Moreover, the limiting plate and the limiting mating part improve the stability of the first bearing and the reducer shaft, ensuring that the reducer shaft will not be displaced due to the vibration of the vehicle driving, thereby improving the reliability and safety of the vehicle.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0019] Figure 1 This is a schematic diagram of an electric drive assembly according to an embodiment of the present invention.

[0020] Figure label:

[0021] Electric drive assembly 1;

[0022] Housing 11, mounting cavity 111;

[0023] Reducer shaft 12, first shaft section 121, sleeve hole 1211, second shaft section 122, support shaft section 123;

[0024] First bearing 13;

[0025] Limiting mating part 14, elastic retaining ring 141, limiting ring 142;

[0026] Motor shaft 15, second bearing 16;

[0027] Limit plate 171, limit plate fastener 172. Detailed Implementation

[0028] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0029] Currently, most electric vehicles employ a three-bearing structure in their electric drive systems to reduce size, weight, and cost. This means one bearing is removed from the connection between the motor shaft and the reducer input shaft. While mass-produced three-bearing structures typically omit one bearing on the motor shaft, the lack of support on one side makes the motor shaft prone to misalignment, posing a risk of bearing damage. In related technologies, a scheme using two bearings on the motor shaft and one on the reducer shaft avoids the motor shaft misalignment problem, but the reducer shaft bearing lacks a fixing structure, making it susceptible to displacement and potentially damaging the oil seals and other components of the electric drive assembly.

[0030] The following is for reference. Figure 1 Describes an electric drive assembly according to an embodiment of the present invention.

[0031] The electric drive assembly 1 according to this utility model includes: a housing 11, a reducer shaft 12, a first bearing 13, and a limiting plate 171. The housing 11 has a mounting cavity 111 for mounting the bearing, and the mounting cavity 111 is open in a first direction to be configured as an open opening. One end of the reducer shaft 12 is received in the mounting cavity 111. The first bearing 13 is sleeved on one end of the reducer shaft 12, and a limiting fitting part 14 is provided on one of the first bearing 13 and the reducer shaft 12. The limiting fitting part 14 abuts against the first bearing 13 and the reducer shaft 12 in the axial direction, respectively. The limiting plate 171 is disposed on the housing 11 and extends at least partially to the open opening of the mounting cavity 111 and is directly opposite the first bearing 13 in the first direction. The limiting fitting part 14 and the limiting plate 171 are respectively located on both sides of the first bearing 13 in the axial direction to restrict the movement of the first bearing 13 in the first direction and the second direction, respectively.

[0032] like Figure 1As shown, the electric drive assembly 1 is provided with a housing 11, and a mounting cavity 111 opening in a first direction is formed inside the housing 11. During assembly, one end of the reducer shaft 12 can be accommodated in the mounting cavity 111, and the first bearing 13 is sleeved on one end of the reducer shaft 12. At the same time, the first bearing 13 is also located in the mounting cavity 111 and abuts against the inner wall of the mounting cavity 111, thereby supporting the reducer shaft 12 radially and preventing the reducer shaft 12 from shifting radially, thus improving the assembly stability of the reducer shaft 12. A limiting fit part 14 is also provided on one of the first bearing 13 and the reducer shaft 12. When the first bearing 13 and one end of the reducer shaft 12 are both accommodated in the mounting cavity 111, the limiting fit part 14 can abut against the first bearing 13 and the reducer shaft 12 axially respectively, thereby restricting the movement of the first bearing 13 relative to the reducer shaft 12 in the second direction. Furthermore, the electric drive assembly 1 is also provided with a limiting plate 171. The limiting plate 171 is disposed on the housing 11, and at least a portion of the limiting plate 171 extends to the opening of the mounting cavity 111 and is directly opposite to at least a portion of the first bearing 13 in the first direction. That is, the limiting plate 171 can abut against the end face of the first bearing 13 away from the limiting mating part 14 in the axial direction, thereby restricting the movement of the first bearing 13 in the first direction. The limiting mating part 14 and the limiting plate 171 are respectively located on both sides of the first bearing 13 in the axial direction. Therefore, the limiting plate 171 and the limiting mating part 14 work together to form a double limiting, which can restrict the movement of the first bearing 13 in the circumferential direction and the stable positioning of the first bearing 13 in the axial direction, reducing the risk of displacement of the first bearing 13 due to vibration or external force.

[0033] The electric drive assembly 1 has a first bearing 13 on the reducer shaft 12. Compared with the traditional scheme of setting two bearings on the reducer shaft 12, the reducer shaft 12 of this utility model reduces the number of bearings, which can reduce the complexity of the electric drive assembly 1, and reduce the overall weight and cost of the electric drive assembly 1. The first bearing 13 provides radial support to the reducer shaft 12 by mating with the inner wall of the mounting cavity 111. At the same time, the electric drive assembly 1 uses the limiting mating part 14 and the limiting plate 171 to limit the first bearing 13 on both sides of the axial direction, restricting the axial movement of the first bearing 13, improving the stability of the first bearing 13 and the reducer shaft 12, and reducing problems such as friction, wear and noise caused by the displacement of the first bearing 13. This improves the overall performance and efficiency of the electric drive assembly 1, and also avoids the damage of the oil seal due to the displacement of the reducer shaft 12, thus improving the reliability and safety of the electric drive assembly 1.

[0034] The first and second directions of this utility model can be simply understood as two opposite directions in the axial direction.

[0035] According to one embodiment of the present invention, the reducer shaft 12 includes: a first shaft segment 121 and a second shaft segment 122. The first shaft segment 121 is used to connect a power unit. The second shaft segment 122 is axially connected to the first shaft segment 121 and has a smaller diameter than the first shaft segment 121. A first bearing 13 is sleeved on the outer periphery of the second shaft segment 122. A first stepped surface is formed between the second shaft segment 122 and the first shaft segment 121. The first stepped surface abuts against the first bearing 13 in a first direction. A limiting fitting part 14 is disposed on the second shaft segment 122. The limiting fitting part 14 is located on one side of the first bearing 13 in a second direction and abuts against the first bearing 13 in the second direction.

[0036] like Figure 1 As shown, the reducer shaft 12 is provided with a first shaft section 121 and a second shaft section 122. The first shaft section 121 is connected to the power unit (which may be the motor shaft 15), and the second shaft section 122 is connected to the first shaft section 121. The diameter of the second shaft section 122 is smaller than that of the first shaft section 121, providing a clear positioning reference for the installation of the first bearing 13. During assembly, the first bearing 13 can be fitted onto the smaller-diameter second shaft section 122 and accommodated in the mounting cavity 111. The electric drive assembly 1, by providing a first shaft section 121 and a second shaft section 122 with different diameters and forming a first stepped surface between the first shaft section 121 and the second shaft section 122, allows the first stepped surface to abut against the first bearing 13 in the first direction after the first bearing 13 is fitted onto the second shaft section 122, effectively restricting the movement of the first bearing 13 in the first direction and ensuring the stable installation of the first bearing 13. The limiting fit part 14 is disposed on the second shaft section 122 and located on one side of the first bearing 13 in the second direction. After the first bearing 13 is sleeved on the second shaft section 122, the limiting fit part 14 can stop with the first bearing 13 in the second direction, restricting the movement of the first bearing 13 in the second direction. The limiting fit part 14 and the first step surface work together to further strengthen the double limiting of the bearing in the axial direction and improve the reliability and stability of the bearing fixation.

[0037] According to one embodiment of the present invention, the limiting fitting part 14 is constructed as an elastic retaining ring 141 sleeved on the second shaft segment 122. As the limiting fitting part 14, the elastic retaining ring 141, through its elastic deformation capability, can be tightly fitted onto the second shaft segment 122 and form a reliable stop with the first bearing 13 in the second direction, effectively restricting the movement of the first bearing 13 in the second direction and ensuring the stable positioning of the bearing. Furthermore, the elastic retaining ring 141 has a certain degree of elasticity, which can absorb some vibration and impact during the operation of the electric drive assembly 1, reducing the risk of displacement or damage to the first bearing 13 due to vibration, and helping to improve the reliability and durability of the powertrain. In addition, using the elastic retaining ring 141 as the limiting fitting part 14, compared to other complex limiting structures, can reduce material and manufacturing costs, and also reduce the difficulty and cost of subsequent maintenance.

[0038] According to one embodiment of the present invention, a limiting ring 142 for abutting against the elastic retaining ring 141 is formed on the outer periphery of one end of the second shaft segment 122. The limiting ring 142 formed on the outer periphery of one end of the second shaft segment 122 provides a clear abutting position for the elastic retaining ring 141. When the elastic retaining ring 141 is sleeved on the second shaft segment 122, the limiting ring 142 can limit the elastic retaining ring 141 on the side of the elastic retaining ring 141 facing the second direction, thereby restricting the movement of the elastic retaining ring 141 in the second direction, enhancing the stability of the elastic retaining ring 141 in the second direction, and enabling the elastic retaining ring 141 to limit the first bearing 13, further preventing the displacement of the first bearing 13.

[0039] According to one embodiment of the present invention, an annular limiting groove for receiving the elastic retaining ring 141 is formed on the outer periphery of one end of the second shaft segment 122. Unlike the scheme in the above embodiment where a limiting ring 142 is used to limit the elastic retaining ring 141, the electric drive assembly 1 can also machine an annular limiting groove on the second shaft segment 122. The annular limiting groove provides a clear installation position for the elastic retaining ring 141, ensuring that the elastic retaining ring 141 can be precisely fitted onto the second shaft segment 122, effectively preventing the elastic retaining ring 141 from sliding or shifting in the axial or radial direction. This allows the elastic retaining ring 141 to form a reliable limiting fit with the first bearing 13, improving the stability of the first bearing 13. Receiving the elastic retaining ring 141 within the annular limiting groove prevents it from falling off or shifting due to external vibration or impact, thereby enhancing the structural reliability of the entire electric drive assembly 1 and reducing the risk of failure or damage due to limiting failure.

[0040] According to one embodiment of the present invention, the electric drive assembly 1 further includes: a motor shaft 15 and a second bearing 16, wherein the motor shaft 15 is axially connected to the reducer shaft 12; the second bearing 16 is disposed on the housing 11 and sleeved on the outer periphery of the motor shaft 15 to support the rotation of the motor shaft 15 on the housing 11. Figure 1 As shown, the motor shaft 15 is connected to the second shaft segment 122, realizing the linkage between the reducer shaft 12 and the motor shaft 15, thereby realizing the power transmission of the electric drive assembly 1. The second bearing 16 is set on the housing 11 and sleeved on the outer circumference of the motor shaft 15, providing stable support for the motor shaft 15, ensuring the smoothness and accuracy of the motor shaft 15 during rotation, and reducing vibration and noise caused by axial or radial runout. In actual assembly, the second bearing 16 can be designed as two spaced apart in the axial direction of the motor shaft 15. The two second bearings 16 jointly support the motor shaft 15, improving the stability of the motor shaft 15. Combined with the first bearing 13 on the reducer shaft 12, the electric drive assembly 1 uses a total of three bearings. Compared with the traditional four-bearing scheme of electric drives, the number of bearings is reduced, the structural complexity and cost are reduced. Moreover, unlike the three-bearing scheme in related technologies, the electric drive assembly 1 of this utility model has two bearings on the motor shaft 15, which can avoid the problem of motor shaft 15 misalignment and improve the reliability of the electric drive assembly 1.

[0041] According to one embodiment of the present invention, a socket hole 1211 is formed in the first shaft segment 121, and the socket hole 1211 is open to the other end of the first shaft segment 121. At least a portion of the motor shaft 15 is received in the socket hole 1211. An internal spline is formed on the inner wall of at least a portion of the socket hole 1211, and an external spline that mates with the internal spline is formed on the outer periphery of the motor shaft 15. By forming the socket hole 1211 in the first shaft segment 121 and extending at least a portion of the motor shaft 15 into the socket hole 1211, the electric drive assembly 1 achieves a tight connection between the motor shaft 15 and the reducer shaft 12, thus establishing a linkage between the motor shaft 15 and the reducer shaft 12, thereby ensuring the normal operation of the electric drive assembly 1. Simultaneously, the internal spline on the inner wall of the socket hole 1211 mates with the external spline on the outer periphery of the motor shaft 15 to form a spline connection. This connection method can effectively transmit torque, reduce slippage or loosening during power transmission, and thus enhance the reliability of power transmission.

[0042] According to one embodiment of the present invention, the reducer shaft 12 further includes a support shaft section 123, which is disposed at the other end of the first shaft section 121 and sleeved on the outer periphery of the motor shaft 15. The inner wall surface of the support shaft section 123 has a smooth surface. Figure 1 As shown, the support shaft section 123 is sleeved on the outer periphery of the motor shaft 15, so that the motor shaft 15 supports the reducer shaft 12 in the radial direction. This ensures the smoothness of power transmission between the motor shaft 15 and the reducer shaft 12 during the operation of the electric drive assembly 1, and reduces vibration and noise caused by axial or radial instability. The smooth wall surface can increase the mating area between the motor shaft 15 and the support shaft section 123, further improving the stability of the connection between the motor shaft 15 and the reducer shaft 12.

[0043] According to one embodiment of the present invention, the electric drive assembly 1 further includes a limiting plate fastener 172, which penetrates the limiting plate 171 and the housing 11 in the thickness direction to fix the limiting plate 171 to the housing 11. By penetrating the limiting plate 171 and the housing 11, the limiting plate fastener 172 achieves a reliable connection between the limiting plate 171 and the housing 11, ensuring that the limiting plate 171 remains stable during vehicle operation and will not loosen or shift due to vibration or impact, thereby guaranteeing the structural stability and reliability of the electric drive assembly 1.

[0044] The vehicle according to this utility model is briefly described below.

[0045] The vehicle according to this utility model includes the electric drive assembly 1 in the above embodiments. Since the vehicle according to this utility model includes the electric drive assembly 1 in the above embodiments, the number of bearings on the reducer shaft 12 is reduced, the weight of the electric drive assembly 1 is reduced, the structure is simpler, and it is conducive to achieving vehicle lightweighting. Moreover, the limiting plate 171 and the limiting mating part 14 improve the stability of the first bearing 13 and the reducer shaft 12, ensuring that the reducer shaft 12 will not be displaced due to the vibration of the vehicle driving, thereby improving the reliability and safety of the vehicle.

[0046] In the description of this utility model, it should be understood that 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., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0047] In the description of this utility model, "first feature" and "second feature" may include one or more of the features.

[0048] In the description of this utility model, "multiple" means two or more.

[0049] In the description of this utility model, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0050] In the description of this utility model, the terms "above", "over" and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0051] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0052] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An electric drive assembly for a vehicle, characterized by, include: The housing (11) has a mounting cavity (111) for mounting a bearing formed inside, and the mounting cavity (111) is open in a first direction to be configured as an open opening; A reducer shaft (12), one end of which is housed within the mounting cavity (111); A first bearing (13) is sleeved on one end of the reducer shaft (12). A limiting fit part (14) is provided on one of the first bearing (13) and the reducer shaft (12). The limiting fit part (14) abuts against the first bearing (13) and the reducer shaft (12) in the axial direction. A limiting plate (171) is disposed on the housing (11) and extends at least partially to the opening of the mounting cavity (111) and is directly opposite the first bearing (13) in a first direction; in The limiting fitting part (14) and the limiting plate (171) are respectively located on both sides of the first bearing (13) in the axial direction to restrict the movement of the first bearing (13) in the first direction and the second direction respectively.

2. The electric drive assembly for a vehicle of claim 1, wherein, The reducer shaft (12) includes: The first shaft segment (121) is used to connect the power unit; The second shaft segment (122) is axially connected to the first shaft segment (121) and has a smaller diameter than the first shaft segment (121). The first bearing (13) is sleeved on the outer periphery of the second shaft segment (122). A first step surface is formed between the second shaft segment (122) and the first shaft segment (121). The first step surface abuts against the first bearing (13) in a first direction. The limiting fitting part (14) is disposed on the second shaft segment (122), and the limiting fitting part (14) is located on one side of the first bearing (13) in the second direction and abuts against the first bearing (13) in the second direction.

3. The electric drive assembly for a vehicle of claim 2, wherein, The limiting fitting part (14) is constructed as an elastic retaining ring (141) sleeved on the second shaft section (122).

4. The electric drive assembly for a vehicle of claim 3, wherein, The outer periphery of one end of the second shaft segment (122) is formed with a limiting ring (142) for abutting against the elastic retaining ring (141).

5. The electric drive assembly for a vehicle of claim 3, wherein, An annular limiting groove for receiving the elastic retaining ring (141) is formed on the outer periphery of one end of the second shaft segment (122).

6. The electric drive assembly for a vehicle of claim 2, wherein, Also includes: Motor shaft (15), which is axially connected to the reducer shaft (12); The second bearing (16) is disposed on the housing (11) and sleeved on the outer periphery of the motor shaft (15) to support the motor shaft (15) to rotate on the housing (11).

7. The electric drive assembly for a vehicle of claim 6, wherein, A socket (1211) is formed in the first shaft segment (121), the socket (1211) being open toward the other end of the first shaft segment (121), and at least a portion of the motor shaft (15) is received within the socket (1211); wherein At least a portion of the inner wall of the socket (1211) is formed with an internal spline, and the outer periphery of the motor shaft (15) is formed with an external spline that mates with the internal spline.

8. The electric drive assembly for a vehicle of claim 7, wherein, The reducer shaft (12) also includes: A support shaft section (123) is provided at the other end of the first shaft section (121) and sleeved on the outer periphery of the motor shaft (15). The inner wall surface of the support shaft section (123) is constructed with a smooth wall surface.

9. The electric drive assembly for a vehicle of claim 1, wherein, Also includes: A limiting plate fastener (172) passes through the limiting plate (171) and the housing (11) respectively in the thickness direction of the limiting plate (171) to fix the limiting plate (171) to the housing (11).

10. A vehicle characterized by comprising: Includes the electric drive assembly as described in any one of claims 1-9.

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