Power assembly and vehicle with same

Abstract

The invention discloses a power assembly and a vehicle with the power assembly, and the power assembly comprises a supporting plate which is arranged in a shell and divides the interior of the shell into a first cavity and a second cavity; the motor is rotatably arranged in the first cavity; the input shaft is rotatably arranged in the second cavity, the input shaft and the motor shaft are coaxially arranged, and a containing hole is formed in the input shaft; the matching section is arranged at one end of the motor shaft and accommodated in the accommodating hole, and the matching section is in key connection with the accommodating hole; and a first oil guide groove for communicating the accommodating hole with the second cavity is formed in the outer surface of the matching section. According to the power assembly, the matching section is in key connection with the containing hole, the first oil guide groove is formed in the outer surface of the matching section, lubricating oil in the second cavity can enter the containing hole through the first oil guide groove and is guided to the connecting key position of the matching section and the containing hole, and therefore lubrication of the connecting position of the input shaft and the motor shaft is achieved; and the service life and the transmission capability of the power assembly are improved.

Description

Technical Field

[0001] The present invention relates to the field of vehicles, and in particular to a power assembly and a vehicle having the same. Background Art

[0002] In the related art, in the powertrain of traditional new energy vehicles, the output end of the motor shaft and the input end of the reducer shaft generally transmit power through splines. During the power transmission process, if there is a lack of lubrication between the motor output shaft and the reducer input shaft, it will cause large operating friction torque, increase temperature, and reduce the bearing life; the lack of lubrication at the spline fitting of the motor shaft and the reducer shaft is prone to wear and failure, thereby affecting the service life and transmission capacity of the powertrain.

[0003] Therefore, how to ensure the lubrication condition between the motor output shaft and the reducer input shaft, as well as the lubrication condition between the motor shaft spline and the reducer spline, and improve the service life and transmission capacity of the powertrain has become a technical problem that needs to be solved urgently by technical personnel in this field. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a powertrain. The powertrain according to the present invention is keyed to a receiving hole via a mating segment. A first oil guide groove is formed on the outer surface of the mating segment. Lubricating oil in the second cavity can enter the receiving hole through the first oil guide groove and be directed to the key connecting the mating segment and the receiving hole, thereby achieving lubrication of the connection between the input shaft and the motor shaft, thereby improving the service life and transmission capacity of the powertrain.

[0005] The present invention also provides a vehicle having the power assembly.

[0006] According to the present invention, the powertrain includes: a housing; a support plate, which is arranged in the housing and divides the housing into a first cavity and a second cavity; a motor shaft, which is rotatably arranged in the first cavity; an input shaft, which is rotatably arranged in the second cavity and is coaxially arranged with the motor shaft, and a receiving hole is formed in the input shaft; a mating section, which is arranged at one end of the motor shaft and received in the receiving hole, and the mating section is key-connected to the receiving hole; and a first oil guide groove is formed on the outer surface of the mating section, which connects the receiving hole with the second cavity.

[0007] According to the present invention, a receiving hole is formed at one end of the input shaft facing the motor shaft of the powertrain. A mating section is provided at one end of the motor shaft facing the input shaft. The mating section is received in the receiving hole, and the axis of the mating section coincides with the axis of the receiving hole. A first spline is formed on the outer wall of the mating section, and a second spline is formed on the inner wall of the receiving hole opposite to the first spline. The first spline and the second spline are cooperatively connected to achieve power transmission between the motor and the reducer. A first oil guiding groove is formed on the outer surface of the mating section. The first oil guiding groove communicates the second cavity with the receiving hole. The lubricating oil in the second cavity can enter the receiving hole through the first oil guiding groove and be guided to the spline connection between the mating section and the receiving hole, thereby realizing lubrication at the connection between the input shaft and the motor shaft, reducing frictional damage between the input shaft and the motor shaft, and improving the service life and transmission capacity of the powertrain.

[0008] According to some embodiments of the present invention, at least a part of the first oil guiding groove is configured to extend spirally in the circumferential direction of the mating section.

[0009] According to some embodiments of the present invention, the first oil guiding grooves are configured to be a plurality of spaced apart on the outer periphery of the mating section.

[0010] According to some embodiments of the present invention, a step surface is formed between one end of the motor shaft and the mating section. A second oil guiding groove communicating with the first oil guiding groove is formed on the step surface. The second oil guiding groove extends in the radial direction of the step surface and / or a third oil guiding groove is formed at the end of the input shaft. The third oil guiding groove communicates with the second oil guiding groove.

[0011] According to some embodiments of the present invention, the powertrain further includes: a first bearing, the first bearing is disposed on the support plate, and the first bearing supports between the support plate and the input shaft.

[0012] According to some embodiments of the present invention, a protruding portion protruding towards the first cavity is formed on the support plate. A third cavity is defined between the protruding portion and the first bearing. The first oil guiding groove conducts the receiving hole and the third cavity through the second oil guiding groove and / or the third oil guiding groove.

[0013] According to some embodiments of the present invention, a through hole adapted for the motor shaft to pass through is provided on the protruding portion. A sealing ring is provided between the inner wall of the through hole and the motor shaft.

[0014] According to some embodiments of the present invention, the mating section and the receiving hole are in clearance fit.

[0015] According to some embodiments of the present invention, the powertrain further includes: a second bearing disposed on the housing and located within the second cavity, the second bearing supporting between the other end of the input shaft and the housing; an oil seal disposed at one end of the motor shaft.

[0016] According to some embodiments of the present invention, a support portion is formed on the housing and located within the first cavity, and a third bearing is disposed on the support portion, the third bearing supporting between the support portion and the other end of the motor shaft.

[0017] According to some embodiments of the present invention, an installation hole for accommodating the third bearing is formed within the support portion, and an elastic member is disposed between the end face of the third bearing and the bottom wall of the installation hole.

[0018] According to some embodiments of the present invention, at least one end of the elastic member is formed with a magnetic adsorption plane.

[0019] The vehicle according to the present invention will be briefly described below.

[0020] The vehicle according to the present invention is provided with the powertrain described in any one of the above embodiments. Since the vehicle according to the present invention is provided with the powertrain described in any one of the above embodiments, the transmission effect of the powertrain assembled within the vehicle according to the present application is better, with high stability and long service life, improving the reliability and safety of the vehicle during operation and enhancing the vehicle's cruising range.

[0021] 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

[0022] 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:

[0023] Figure 1 is a schematic structural diagram of a powertrain according to some embodiments of the present invention;

[0024] Figure 2 is a schematic diagram of the cooperation between a mating section and a receiving hole according to some embodiments of the present invention;

[0025] Figure 3 is a schematic diagram of the position of a third oil guiding groove according to some embodiments of the present invention;

[0026] Figure 4 is a schematic diagram of the position of a first oil guiding groove according to some embodiments of the present invention.

[0027] Reference Numerals:

[0028] Powertrain 100;

[0029] Shell 1, support plate 11, first cavity 101, second cavity 102, third cavity 103;

[0030] Motor shaft 2, mating section 21, first oil guide groove 201, first spline 22;

[0031] Input shaft 3, receiving hole 301, third oil guide groove 302, second oil guide groove 303;

[0032] A first bearing 41, a second bearing 42, a third bearing 43, and a support portion 44;

[0033] Elastic part 5, sealing ring 6. DETAILED DESCRIPTION

[0034] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0035] In the related art, in the powertrain of traditional new energy vehicles, the output end of the motor shaft and the input end of the reducer shaft generally transmit power through splines. During the power transmission process, if there is a lack of lubrication between the motor output shaft and the reducer input shaft, it will cause large operating friction torque, increase temperature, and reduce the bearing life; the lack of lubrication at the spline fitting of the motor shaft and the reducer shaft is prone to wear and failure, thereby affecting the service life and transmission capacity of the powertrain.

[0036] Therefore, how to ensure the lubrication condition between the motor output shaft and the reducer input shaft, as well as the lubrication condition between the motor shaft spline and the reducer spline, and improve the service life and transmission capacity of the powertrain has become a technical problem that needs to be solved urgently by technical personnel in this field.

[0037] Reference below Figures 1-4 A powertrain according to an embodiment of the present invention is described.

[0038] The powertrain 100 according to the present invention includes: a housing 1, a support plate 11, a motor shaft 2, an input shaft 3, and a mating section 21; the support plate 11 is disposed within the housing 1 and divides the interior of the housing 1 into a first cavity 101 and a second cavity 102; the motor is rotatably disposed in the first cavity 101; the input shaft 3 is rotatably disposed in the second cavity 102 and is coaxially arranged with the motor shaft 2, and a receiving hole 301 is formed in the input shaft 3; the mating section 21 is disposed at one end of the motor shaft 2 and is received in the receiving hole 301, and the mating section 21 is key-connected to the receiving hole 301; a first oil guiding groove 201 that communicates the receiving hole 301 with the second cavity 102 is formed on the outer surface of the mating section 21.

[0039] In some specific embodiments, the powertrain 100 is composed of a housing 1, a support plate 11, a motor shaft 2, and an input shaft 3. An accommodation cavity is formed in the housing 1, and the accommodation cavity can be used to accommodate the support plate 11, the motor shaft 2, and the input shaft 3. The housing 1 can protect the components in the accommodation cavity and effectively prevent the external environment from damaging the components in the accommodation cavity. The support plate 11 is disposed in the accommodation cavity and divides the accommodation cavity into a first cavity 101 and a second cavity 102. To a certain extent, the support plate 11 can improve the structural strength and stiffness of the housing 1 and prevent the housing 1 from deforming when subjected to external forces. The input shaft 3 is rotatably disposed in the second cavity 102, and the motor shaft 2 is rotatably disposed in the first cavity 101. A receiving hole 301 is formed at one end of the input shaft 3 facing the motor shaft 2. A mating section 21 is disposed at one end of the motor shaft 2 facing the input shaft 3. The mating section 21 is received in the receiving hole 301, and the axis of the mating section 21 coincides with the axis of the receiving hole 301. A first spline 22 is formed on the outer wall of the mating section 21, and a second spline that is disposed opposite to the first spline 22 is formed on the inner wall of the receiving hole 301. The first spline 22 is in mating connection with the second spline, realizing the transmission of power from the motor shaft 2 to the input shaft 3 and the power transmission between the motor and the reducer. A first oil guiding groove 201 is formed on the outer surface of the mating section 21. The first oil guiding groove 201 communicates the second cavity 102 with the receiving hole 301. The lubricating oil in the second cavity 102 can enter the receiving hole 301 through the first oil guiding groove 201 and be guided to the connecting splines of the mating section 21 and the receiving hole 301, thereby realizing the lubrication of the connection between the input shaft 3 and the motor shaft 2, reducing the frictional damage between the input shaft 3 and the motor shaft 2, and improving the service life and transmission capacity of the powertrain 100.

[0040] According to the present invention, a receiving hole 301 is formed at one end of the input shaft 3 facing the motor shaft 2 of the powertrain 100. A mating section 21 is provided at one end of the motor shaft 2 facing the input shaft 3. The mating section 21 is received in the receiving hole 301, and the axis of the mating section 21 coincides with the axis of the receiving hole 301. A first spline 22 is formed on the outer wall of the mating section 21, and a second spline is formed on the inner wall of the receiving hole 301 opposite to the first spline 22. The first spline 22 and the second spline are in mating connection to achieve power transmission between the motor and the reducer. A first oil guiding groove 201 is formed on the outer surface of the mating section 21. The first oil guiding groove 201 communicates the second cavity 102 with the receiving hole 301. The lubricating oil in the second cavity 102 can enter the receiving hole 301 through the first oil guiding groove 201 and be guided to the spline connection between the mating section 21 and the receiving hole 301, thereby achieving lubrication at the connection between the input shaft 3 and the motor shaft 2, reducing frictional damage between the input shaft 3 and the motor shaft 2, and improving the service life and transmission capacity of the powertrain 100.

[0041] According to some embodiments of the present invention, at least a part of the first oil guiding groove 201 is configured to extend spirally in the circumferential direction of the mating section 21.

[0042] In some specific embodiments, at least a part of the outer circumference of the mating section 21 is formed with a first oil guiding groove 201 that extends spirally in the circumferential direction. Configuring the first oil guiding groove 201 as a spiral can form a longer contact line on the mating section 21, increasing the distribution and transfer time of the lubricating oil on the mating section 21 and improving the lubrication effect on the mating section 21. The spiral first oil guiding groove 201 can also generate a vortex effect, causing the lubricating oil to form a strong rotational flow in the groove, making the flow velocity and diffusion velocity of the lubricating oil faster, improving the supply efficiency of the lubricating oil. The spiral oil guiding groove can also guide the lubricating oil, enabling the lubricating oil to flow more to the key connection between the mating section 21 and the receiving hole 301, enhancing the lubrication effect at the key connection between the mating section 21 and the receiving hole 301. In addition, when the lubricating oil flows in the spiral oil groove, it can also carry away dust and particulate impurities in the spiral oil groove, preventing dust and impurities from accumulating in the first oil guiding groove 201.

[0043] The first oil guiding groove 201 designed in a spiral shape can optimize the lubrication effect, improve the fluidity of the lubricating oil, and guide the lubricating oil, enabling the lubricating oil to flow more to the key connection between the mating section 21 and the receiving hole 301, thereby ensuring the lubrication effect between the motor output shaft and the reducer input shaft 3, as well as the lubrication effect at the key connection between the mating section 21 and the receiving hole 301, and improving the service life and transmission capacity of the powertrain 100.

[0044] According to some embodiments of the present invention, the first oil guiding groove 201 is configured as a plurality of grooves spaced apart on the outer circumference of the mating section 21.

[0045] In some specific embodiments, a plurality of first oil guiding grooves 201 are arranged at intervals around at least a part of the outer periphery of the mating section 21. The plurality of first oil guiding grooves 201 can form multiple contact lines on the mating section 21, increasing the flow path of the lubricating oil, so that the lubricating oil can cover all positions of the mating section 21, further improving the lubrication effect on the mating section 21. The arrangement of the plurality of first oil guiding grooves 201 enables more lubricating oil to be guided to the key connection between the mating section 21 and the receiving hole 301 or the severely worn places between the mating section 21 and the receiving hole 301, further enhancing the lubrication effect between the output shaft and the input shaft 3 of the reducer and the lubrication effect at the key connection between the mating section 21 and the receiving hole 301, and improving the service life and transmission capacity of the power assembly 100.

[0046] According to some embodiments of the present invention, a stepped surface is formed between one end of the motor shaft 2 and the mating section 21. A second oil guiding groove 303 communicating with the first oil guiding groove 201 is formed on the stepped surface. The second oil guiding groove 303 extends radially along the stepped surface and / or a third oil guiding groove 302 is formed at the end of the input shaft 3, and the third oil guiding groove 302 communicates with the second oil guiding groove 303.

[0047] In some specific embodiments, a stepped surface is formed at the connection between one end of the motor shaft 2 and the mating section 21. A second oil guiding groove 303 communicating with the first oil guiding groove 201 is formed on the stepped surface. The second oil guiding groove 303 extends radially along the stepped surface. A third oil guiding groove 302 is formed at one end of the input shaft 3 facing the stepped surface. The third oil guiding groove 302 extends axially along the input shaft 3. The second oil guiding groove 303 and the third oil guiding groove 302 are connected. The lubricating oil in the third cavity 103 can enter the first oil guiding groove 201 and the receiving hole 301 through the second oil guiding groove 303 and the third oil guiding groove 302. The design of the second oil guiding groove 303 and the third oil guiding groove 302 can increase the oil inflow between the mating section 21 and the receiving hole 301, enabling the mating section 21 and the receiving hole 301 to be better lubricated, thereby reducing the wear between the input shaft 3 and the motor shaft 2 and improving the service life of the motor shaft 2 and the input shaft 3.

[0048] In some other embodiments, a stepped surface is formed at the connection between one end of the motor shaft 2 and the mating section 21. There is a certain gap between the end surface of one end of the input shaft 3 and the stepped surface. A third oil guiding groove 302 is formed on the end of the input shaft 3 facing the stepped surface. The third oil guiding groove 302 extends along the axial direction of the input shaft 3. The third oil guiding groove 302 is communicated with the first oil guiding groove 201. The lubricating oil in the third cavity 103 can enter the receiving hole 301 through the third oil guiding groove 302 and the first oil guiding groove 201. The design of the third oil guiding groove 302 can increase the oil inflow between the mating section 21 and the receiving hole 301, so that the mating section 21 and the receiving hole 301 can be better lubricated, thereby reducing the wear between the input shaft 3 and the motor shaft 2 and improving the service life of the motor shaft 2 and the input shaft 3.

[0049] According to some embodiments of the present invention, the powertrain 100 further includes: a first bearing 41, the first bearing 41 is disposed on the support plate 11, and the first bearing 41 supports between the support plate 11 and the input shaft 3.

[0050] In some specific embodiments, a first bearing 41 is further disposed in the powertrain 100. The first bearing 41 is disposed between the support plate 11 and the input shaft 3. A second stepped surface is formed on a section of the input shaft 3 facing the support plate 11. The first bearing 41 abuts against the support plate 11 and the second stepped surface respectively. The first bearing 41 can play a role in supporting and fixing the support plate 11 and the input shaft 3, ensuring the stability of the relative positions of the support plate 11 and the input shaft 3 without deviation and shaking; since the input shaft 3 is subject to the load brought by the transmitted power, the first bearing 41 can effectively bear these loads for the input shaft 3 and transfer them to other components, thereby ensuring the reliability and stability of the operation of the input shaft 3; the first bearing 41 can also limit the axial movement of the input shaft 3 in the radial direction, making the operation of the reducer more stable and improving the transmission accuracy; also because the first bearing 41 is disposed at the mating portion of the mating section 21 and the receiving hole 301, the first bearing 41 also plays a role in supporting and fixing the motor shaft 2 to a certain extent, ensuring that the motor shaft 2 will not deviate during operation and ensuring the stability and reliability of the operation of the motor shaft 2; in addition, a lubricating oil channel is provided on the first bearing 41, and the lubricating oil channel is communicated with the second cavity 102, and the lubricating oil in the second cavity 102 can be transferred to the second oil guiding groove 303 or the third oil guiding groove 302, realizing the full lubrication of the first bearing 41, the input shaft 3 and the motor shaft 2, and prolonging the service life of the first shaft, the input shaft 3 and the output shaft.

[0051] According to some embodiments of the present invention, a protruding portion protruding toward the first cavity 101 is formed on the support plate 11. A third cavity 103 is defined between the protruding portion and the first bearing 41. The first oil guiding groove 201 conducts the receiving hole 301 and the third cavity 103 through the second oil guiding groove 303 and / or the third oil guiding groove 302.

[0052] In some specific embodiments, a protruding portion protruding toward the inside of the first cavity 101 is formed at the center of the support plate 11. A third cavity 103 is formed between the side of the protruding portion facing the second cavity 102 and the side of the first bearing 41 facing the first cavity 101. The third cavity 103 is communicated with the second cavity 102 through a lubricating oil passage formed on the first bearing 41. The third cavity 103 is communicated with the receiving hole 301 through the first oil guiding groove 201 and the third oil guiding groove 302 or the second oil guiding groove 303. Therefore, the lubricating oil in the second cavity 102 can enter the third cavity 103 through the first bearing 41, and lubricate the mating section 21 and the receiving hole 301 through the first oil guiding groove 201 and the second oil guiding groove 303 or the third oil guiding groove 302, realizing the circulation of the lubricating oil among the second cavity 102, the third cavity 103 and the receiving hole 301.

[0053] According to some embodiments of the present invention, a through hole adapted for the motor shaft 2 to pass through is provided on the protruding portion, and a sealing ring 6 is provided between the inner wall of the through hole and the motor shaft 2.

[0054] In some specific embodiments, a through hole coinciding with the axis of the motor shaft 2 is formed on the protruding portion. The motor shaft 2 is arranged in the through hole, and the motor shaft 2 abuts against the inner peripheral wall of the through hole to limit the radial movement of the motor shaft 2, improving the stability and reliability of the motor shaft 2 located in the housing 1. A plurality of sealing rings 6 are provided between the inner wall of the through hole and the motor shaft 2. The plurality of sealing rings 6 can separate the third cavity 103 from the first cavity 101 and play a sealing role for the third cavity 103, effectively preventing the lubricating oil in the third cavity 103 from flowing into the first cavity 101 and protecting other components in the first cavity 101 from being affected by the lubricating oil.

[0055] According to some embodiments of the present invention, the mating section 21 and the receiving hole 301 are in clearance fit.

[0056] In some specific embodiments, a small clearance fit is adopted between the mating section 21 and the receiving hole 301, so that there is a certain small gap between the mating section 21 and the receiving hole 301. The appropriate small gap can reduce the direct contact area between the outer wall of the mating section 21 and the inner wall of the receiving hole 301, thereby reducing the friction between the input shaft 3 and the motor shaft 2 and the wear degree between the input shaft 3 and the motor shaft 2, and prolonging the service life of the power assembly 100; the small gap can also accommodate lubricating oil and form a lubricating oil film on the outer wall of the motor shaft 2 and the inner wall of the receiving hole 301, reducing the friction loss between the motor shaft 2 and the input shaft 3, improving the lubrication effect between the motor shaft 2 and the input shaft 3, and making the power assembly 100 operate more stably and reliably.

[0057] In addition, during the force transmission process between the input shaft 3 and the motor shaft 2, friction between the motor shaft 2 and the input shaft 3 generates heat, and the motor shaft 2 and the input shaft 3 may collide due to the heat. The small gap design can provide room for expansion and contraction of the input shaft 3 and the motor shaft 2, avoiding the mating section 21 and the receiving hole 301 from being too tight due to temperature changes, thereby ensuring the stable operation of the powertrain 100.

[0058] The clearance fit between the fitting section 21 and the receiving hole 301 reduces the difficulty of assembling the motor shaft 2 and the input shaft 3 to a certain extent, and improves the assembly efficiency of the power assembly 100 .

[0059] According to some embodiments of the present invention, the powertrain 100 further includes: a second bearing 42 and an oil seal, wherein the second bearing 42 is disposed on the housing 1 and is located in the second cavity 102, and the second bearing 42 is supported between the other end of the input shaft 3 and the housing 1; and the oil seal is disposed on one end of the motor shaft 2.

[0060] In some specific embodiments, a second bearing 42 is further provided in the powertrain 100. The second bearing 42 is provided in the second cavity 102. The second bearing 42 is respectively abutted against the outer periphery of the other end of the input shaft 3 and the inner wall of the housing 1. The second bearing 42 can support and fix the housing 1 and the other end of the input shaft 3, ensuring that the relative position of the housing 1 and the other end of the input shaft 3 is stable and does not deviate or shake. Since the other end of the input shaft 3 will be subjected to the load brought by the transmitted power, the second bearing 42 can effectively bear these loads on behalf of the other end of the input shaft 3 and transfer them to other components, thereby ensuring the reliability and stability of the input shaft 3. The second bearing 42 can also limit the radial movement of the other end of the input shaft 3, making the operation of the reducer more stable.

[0061] An oil seal is also provided on the motor shaft 2, which can separate the second cavity 102 from the first cavity 101 and seal the second cavity 102 to prevent leakage of lubricating oil in the receiving hole 301 and the first bearing 41. On the one hand, the lubricating oil can fully flow in the second cavity 102 and the receiving hole 301, thereby improving the lubrication effect between the motor shaft 2 and the input shaft 3. On the other hand, it can effectively prevent the lubricating oil from entering the interior of the motor, affecting the normal operation of other components inside the motor, and protecting other components inside the motor.

[0062] According to some embodiments of the present invention, a support portion 44 located in the first cavity 101 is formed on the housing 1 , a third bearing 43 is provided on the support portion 44 , and the third bearing 43 is supported between the support portion 44 and the other end of the motor shaft 2 .

[0063] In some specific embodiments, a support portion 44 extending toward the interior of the first cavity 101 is formed at the end of the shell 1 away from the second cavity 102, and a third bearing 43 is arranged between the support portion 44 and the other end of the motor shaft 2. The second bearing 42 is respectively abutted against the outer periphery of the other end of the motor shaft 2 and the inner wall of the support portion 44. The third bearing 43 can support and fix the support portion 44 and the other end of the motor shaft 2, thereby ensuring that the relative position of the shell 1 and the motor shaft 2 is stable and does not deviate or shake. When the other end of the motor shaft 2 is subjected to load, the third bearing 43 can effectively share the load for the other end of the motor shaft 2 and transfer it to other components, thereby ensuring the reliability and stability of the motor shaft 2. The third bearing 43 can also limit the radial movement of the other end of the motor shaft 2, so that the operation of the motor shaft 2 is more stable and reliable, thereby improving the stability and reliability of the powertrain 100 during operation.

[0064] In the powertrain 100 of the present application, only three bearings are used to support the motor reduction input shaft 3 and the motor shaft 2. Compared with the traditional powertrain 100 that uses four bearings to support the motor shaft 2 and the reducer input shaft 3, the number of bearings used is reduced, the axial length of the powertrain 100 is shortened, the space occupied by the powertrain 100 is smaller, and the manufacturing cost of the powertrain 100 is reduced.

[0065] According to some embodiments of the present invention, a mounting hole for accommodating the third bearing 43 is formed in the support portion 44 , and an elastic member 5 is provided between an end surface of the third bearing 43 and a bottom wall of the mounting hole.

[0066] In some specific embodiments, the support portion 44 is formed with a mounting hole recessed into the support portion 44 at one end facing the input shaft 3, the third bearing 43 is arranged in the mounting hole and an elastic member 5 is arranged between one end of the third bearing 43 and the bottom wall of the mounting hole, and the elastic member 5 is arranged axially along the motor shaft 2. On the one hand, the elastic member 5 can limit the axial movement of the third bearing 43 along the motor shaft 2, and since the third shaft and the other end of the motor shaft 2 are stopped, the elastic member 5 can limit the axial movement of the motor shaft 2, prevent the axial movement of the motor shaft 2, and improve the stability and reliability of the motor shaft 2 during operation. On the other hand, the motor shaft 2 will generate vibration and impact force during operation, and the vibration and impact force are transmitted from the motor shaft 2 to the third bearing 43, and then transmitted to the elastic member 5 by the third bearing 43. The elastic member 5 can absorb vibration and disperse impact force, reduce its damage to the motor shaft 2 and other parts, thereby reducing vibration noise and extending the life of the motor shaft 2.

[0067] According to some embodiments of the present invention, at least one end of the elastic member 5 is formed with a magnetic adsorption plane. When the elastic member 5 is assembled on the production line, the magnetic adsorption plane can increase the contact area with the magnet, enhance the magnet adsorption strength, ensure that the magnet is reliably adsorbed on the elastic member 5, improve the stability and reliability during the transportation between the magnet and the elastic member 5, and effectively prevent the elastic member 5 from shaking and falling during assembly.

[0068] The vehicle according to the present invention will be briefly described below.

[0069] The vehicle according to the present invention is provided with the power assembly 100 described in any one of the above embodiments. Since the vehicle according to the present invention is provided with the power assembly 100 described in any one of the above embodiments, the transmission effect of the power assembly 100 assembled in the vehicle according to the present application is better, the stability is high, the service life is long, the reliability and safety of the vehicle during operation are improved, and the cruising range of the vehicle is increased. In the description of the present invention, 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. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are 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 thus should not be construed as a limitation to the present invention.

[0070] In the description of the present invention, the "first feature" and "second feature" may include one or more of such features.

[0071] In the description of the present invention, the meaning of "a plurality" is two or more.

[0072] In the description of the present invention, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween.

[0073] In the description of the present invention, "above", "over" and "on" a second feature for a first feature include the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher level of height than the second feature. In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples", etc. 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 this 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.

[0074] 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 powertrain, characterized in that, Comprising: A housing; A support plate, which is arranged inside the housing and divides the inside of the housing into a first cavity and a second cavity; A motor shaft, which is rotatably arranged in the first cavity; An input shaft, which is rotatably arranged in the second cavity and coaxially arranged with the motor shaft, and a receiving hole is formed inside the input shaft; A mating section, which is arranged at one end of the motor shaft and received in the receiving hole, and the mating section is key-connected with the receiving hole; A first oil guiding groove is formed on the outer surface of the mating section to communicate the receiving hole with the second cavity.

2. The powertrain according to claim 1, wherein, At least part of the first oil guiding groove is configured to spirally extend in the circumferential direction of the mating section.

3. The powertrain according to claim 2, characterized in that, The first oil guiding groove is configured to be a plurality of spaced apart on the outer periphery of the mating section.

4. The powertrain according to claim 1, characterized in that, A step surface is formed between one end of the motor shaft and the mating section, and a second oil guiding groove communicating with the first oil guiding groove is formed on the step surface, and the second oil guiding groove extends radially along the step surface and / or A third oil guiding groove is formed at the end of the input shaft, and the third oil guiding groove communicates with the second oil guiding groove.

5. The powertrain according to claim 4, characterized in that, Further comprising: A first bearing, which is arranged on the support plate and supports between the support plate and the input shaft.

6. The powertrain according to claim 5, characterized in that, A protruding portion protruding towards the first cavity is formed on the support plate, and a third cavity is defined between the protruding portion and the first bearing, and the first oil guiding groove conducts the receiving hole and the third cavity through the second oil guiding groove and / or the third oil guiding groove.

7. The powertrain according to claim 6, characterized in that, A through hole suitable for the motor shaft to pass through is formed on the protruding portion, and a sealing ring is arranged between the inner wall of the through hole and the motor shaft.

8. The powertrain according to claim 1, characterized in that, The mating section is in clearance fit with the receiving hole.

9. The powertrain according to claim 1, characterized in that, Further comprising: A second bearing, which is arranged on the housing and located in the second cavity, and the second bearing supports between the other end of the input shaft and the housing; An oil seal, which is arranged at one end of the motor shaft.

10. The powertrain according to claim 1, characterized in that, A support portion located in the first cavity is formed on the housing, and a third bearing is arranged on the support portion and supports between the support portion and the other end of the motor shaft.

11. The powertrain according to claim 10, wherein, An installation hole for accommodating the third bearing is formed inside the support portion, and an elastic member is arranged between the end face of the third bearing and the bottom wall of the installation hole.

12. The powertrain according to claim 11, characterized in that, At least one end of the elastic member is formed with a magnetic adsorption plane.

13. A vehicle, characterized in that, Comprising the power assembly according to any one of claims 1-12.

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