Electric drive assembly and vehicle

Abstract

The electric drive assembly comprises a motor and a speed reducer, the motor comprises a motor shell and a motor shaft, the motor shell comprises a motor shell body and a motor end cover connected with the motor shell body in a sealing mode, the motor shaft is arranged in the motor shell body, and the speed reducer is arranged in the motor shell body. The motor shell is provided with an oil inlet, the motor shaft is provided with an oil duct, and the oil duct is communicated with the oil inlet; the speed reducer comprises an input shaft; wherein one of the motor shaft and the input shaft comprises an inner matching section, the other one of the motor shaft and the input shaft comprises an outer matching section, the outer matching section is arranged on the inner matching section in a sleeving manner and is in clearance fit with the inner matching section, a first buffer cavity is defined between the outer matching section and the inner matching section, and the first buffer cavity is communicated with the oil duct. According to the electric drive assembly, the risk that lubricating oil leaks is low.

Description

Technical Field

[0001] The utility model relates to the technical field of electric drive, in particular to an electric drive assembly and a vehicle. Background Art

[0002] The electric drive assembly includes a motor and a reducer, and has been developing in the direction of high speed, oil cooling, and high efficiency in recent years. At present, the motor shaft of the motor and the input shaft of the reducer are mostly supported by bearings, and the motor shaft and the input shaft are positioned and supported by a spline connection, and the power is transmitted through a spline connection. When the motor is working at a high speed, if the spline, spline and bearing cannot be repeatedly lubricated and cooled by lubricating oil, it is easy to cause rust and wear of the spline and spline, and poor lubrication and damage of the bearing.

[0003] In the related art, an oil inlet is provided on the reducer housing, and an oil pipe is provided in the hollow input shaft. The lubricating oil enters the oil pipe through the oil inlet and is transported along the axial direction of the input shaft. A cavity is formed between the oil pipe and the input shaft, and an oil outlet hole is provided on the oil pipe. The lubricating oil in the oil pipe flows into the cavity through the oil outlet hole. A part of the lubricating oil in the cavity flows in the direction toward the motor shaft, and when the input shaft rotates at high speed, it enters the spline fitting clearance under the action of centrifugal force, and then is thrown out through the stop fitting clearance, and finally enters the bearing seat through the clearance between the input shaft and the output shaft to achieve lubrication of one of the bearings; another part of the lubricating oil in the cavity flows in the direction away from the motor shaft, and then enters the other bearing seat through the clearance between the reducer housing and the input shaft to achieve lubrication of the other bearing.

[0004] The reducer housing includes a reducer end cover and a reducer housing, and the reducer end cover and the reducer housing are usually connected by bolts. Since the reducer is subjected to a large driving load when the electric drive assembly is running, there is a large interaction force between the reducer end cover and the reducer housing. The reducer end cover and the reducer housing are prone to misalignment under this interaction force, resulting in a greater risk of seal failure between the reducer end cover and the reducer housing, which in turn leads to a greater risk of leakage of the lubricating oil entering through the oil inlet of the reducer housing. Utility Model Content

[0005] The utility model aims to solve one of the technical problems in the related art at least to a certain extent.

[0006] To this end, the utility model proposes an electric drive assembly to reduce the risk of lubricating oil leakage.

[0007] The electric drive assembly of the utility model includes a motor and a reducer, wherein the motor includes a motor housing and a motor shaft, wherein the motor housing includes a motor case and a motor end cover sealed with the motor case, wherein the motor shaft is arranged in the motor housing, wherein the motor housing is provided with an oil inlet, wherein the motor shaft is provided with an oil passage, wherein the oil passage is communicated with the oil inlet; wherein the reducer includes an input shaft; wherein one of the motor shaft and the input shaft includes an inner mating section, and the other includes an outer mating section, wherein the outer mating section is sleeved on the inner mating section and has a clearance fit with the inner mating section, wherein a first cache cavity is enclosed between the outer mating section and the inner mating section, and wherein the first cache cavity is communicated with the oil passage.

[0008] Optionally, the inner mating section is provided with an external spline, and the outer mating section is provided with an internal spline, and the external spline is loosely fitted with the internal spline; the inner mating section is provided with a supporting portion, and the outer side surface of the supporting portion is loosely fitted with the inner side surface of the outer mating section; wherein the first cache cavity is arranged between the external spline and the supporting portion in the axial direction of the motor shaft.

[0009] Optionally, the electric drive assembly further includes a first bearing, the first bearing is sleeved on the outer mating section, an axial end surface of the outer mating section is provided with an oil discharge groove, and the oil discharge groove penetrates the outer mating section in the radial direction of the motor shaft.

[0010] Optionally, the support portion is arranged between the external spline and the axial end face in the axial direction of the motor shaft, and the outer side surface of the support portion is provided with an oil groove extending along the axial direction of the motor shaft, and the oil groove is connected to the first cache cavity.

[0011] Optionally, the electric drive assembly also includes a second bearing, which is sleeved on the end of the input shaft away from the motor shaft; the motor shaft includes the inner mating section, the input shaft includes the outer mating section, the input shaft is provided with a channel extending axially through the motor shaft, and the outer mating section is sleeved on the inner mating section through the channel.

[0012] Optionally, the motor shaft includes the inner mating section, the input shaft includes the outer mating section, and the end of the oil channel away from the input shaft is connected to the oil inlet; the oil channel includes a first section and a second section, the first section is arranged on the inner mating section, and the second section is arranged on a side of the first section away from the input shaft, and the motor shaft is provided with a through hole extending along its radial direction, and the through hole is connected to the second section.

[0013] Optionally, the diameter of the first section is smaller than the diameter of the second section, and the electric drive assembly further comprises an oil pipe, which is arranged in the second section, and a second cache cavity is formed between the oil pipe and the oil channel, and one end of the oil pipe away from the input shaft is connected to the oil inlet, and the oil pipe is provided with a connecting hole connected to the second cache cavity; the number of the perforations is multiple, and a part of the perforations is arranged on one side of another part of the perforations in the axial direction of the motor shaft, and a plurality of the perforations are all connected to the second cache cavity, and the connecting hole is arranged between two adjacent perforations in the axial direction of the motor shaft.

[0014] Optionally, the inner diameter of the oil pipe is less than or equal to the diameter of the first section.

[0015] Optionally, the motor shaft includes the inner mating section, the input shaft includes the outer mating section, the oil channel penetrates the motor shaft along the axial direction of the motor shaft, and the port of the oil channel away from the input shaft is connected to the oil inlet; a sealing plug is provided in the oil channel, the sealing plug is sealingly connected to the motor shaft, and the sealing plug blocks the port of the oil channel close to the input shaft; and / or, the motor end cover is arranged on a side of the motor housing away from the reducer, and the oil inlet is arranged on the motor end cover.

[0016] The utility model also provides a vehicle.

[0017] The vehicle of the present invention includes the electric drive assembly described in any one of the above embodiments.

[0018] The electric drive assembly of the utility model is provided with an oil inlet on the motor housing, and an oil passage connected to the oil inlet is provided on the motor shaft, so that the lubricating oil can enter the oil passage through the oil inlet. By setting one of the motor shaft and the input shaft to include an inner fitting section, and the other to include an outer fitting section, the outer fitting section is sleeved on the inner fitting section, and the outer fitting section and the inner fitting section are surrounded by a first cache cavity connected to the oil passage, so that the lubricating oil in the oil passage can enter the first cache cavity. By matching the outer fitting section with the inner fitting section in a clearance, the lubricating oil in the first cache cavity can flow to the clearance between the outer fitting section and the inner fitting section, so as to achieve lubrication and cooling at the clearance matching of the outer fitting section and the inner fitting section, for example, lubrication and cooling at the spline. Since the driving load borne by the motor during the operation of the electric drive assembly is small, the interaction force between the motor housing and the motor end cover is small, the risk of misalignment between the motor housing and the motor end cover is low, and the risk of sealing failure between the motor housing and the motor end cover is low, so that the risk of leakage of the lubricating oil entering through the oil inlet of the motor housing is low, that is, the risk of leakage of the lubricating oil is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1It is a partial cross-sectional view of an electric drive assembly according to an embodiment of the utility model.

[0020] Figure 2 It is a partial half-section view of an electric drive assembly according to an embodiment of the utility model.

[0021] Figure 3 It is a half-section view of the connection between the motor shaft and the input shaft of the electric drive assembly of one embodiment of the utility model.

[0022] Figure 4 It is a schematic diagram of the partial structure of the motor shaft of the electric drive assembly of one embodiment of the utility model.

[0023] Figure 5 It is a schematic structural diagram of the connection between the first bearing and the input shaft of an electric drive assembly of an embodiment of the utility model.

[0024] Figure 6 It is a half-section view of the connection between the oil pipe, the bushing and the motor shaft of one embodiment of the utility model.

[0025] Figure 7 It is a half-section view of the connection between the oil pipe, the retaining spring and the motor shaft of one embodiment of the utility model.

[0026] Reference numerals:

[0027] 1. motor shaft; 11. oil channel inlet; 12. oil channel; 121. first section; 122. second section; 123. stopper;

[0028] 124, retaining ring; 13, oil outlet hole; 14, external spline; 15, supporting part; 151, oil groove; 16, through hole; 101, inner matching section;

[0029] 2. Input shaft; 21. First cache cavity; 22. Passage; 23. Second cache cavity; 24. Oil discharge groove; 201. External matching section; 2011. Axial end face;

[0030] 3. The first bearing;

[0031] 4. The first bearing seat;

[0032] 5. Second bearing;

[0033] 6. Second bearing seat;

[0034] 7. Oil pipe; 71. Connecting hole;

[0035] 8. Bushing; 81. Sealing ring groove;

[0036] 9. Sealing plug;

[0037] 10. Sealing ring. DETAILED DESCRIPTION

[0038] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but cannot be understood as limiting the present invention.

[0039] like Figures 1 to 3 As shown, the electric drive assembly of the embodiment of the utility model includes a motor and a reducer, and the motor includes a motor housing and a motor shaft 1, and the motor shaft is arranged in the motor housing. The motor housing includes a motor casing and a motor end cover sealed with the motor casing. The motor casing is provided with an oil inlet, and the motor shaft 1 is provided with an oil passage 12, and the oil passage 12 is connected with the oil inlet. The reducer includes an input shaft 2, and one of the motor shaft 1 and the input shaft 2 includes an inner mating section 101, and the other includes an outer mating section 201, and the outer mating section 201 is sleeved on the inner mating section 101 and has a clearance fit with the inner mating section 101, and a first cache cavity 21 is enclosed between the outer mating section 201 and the inner mating section 101, and the first cache cavity 21 is connected with the oil passage 12.

[0040] The outer fitting section 201 is sleeved on the inner fitting section 101 and is clearance-fitted with the inner fitting section 101 , so as to realize the connection between the motor shaft 1 and the input shaft 2 .

[0041] The electric drive assembly of the embodiment of the utility model is provided with an oil inlet on the motor housing and an oil passage 12 connected with the oil inlet on the motor shaft, so that the lubricating oil can enter the oil passage 12 through the oil inlet. By setting one of the motor shaft 1 and the input shaft 2 to include an inner mating section 101 and the other to include an outer mating section 201, the outer mating section 201 is sleeved on the inner mating section 101, and the outer mating section 201 and the inner mating section 101 are surrounded by a first cache cavity 21 connected with the oil passage 12, so that the lubricating oil in the oil passage 12 can enter the first cache cavity 21. By gap fitting the outer mating section 201 and the inner mating section 101, the lubricating oil in the first cache cavity 21 can flow to the gap between the outer mating section 201 and the inner mating section 101, so as to achieve lubrication and cooling at the gap fitting of the outer mating section 201 and the inner mating section 101, for example, lubrication and cooling at the spline.

[0042] Since the driving load borne by the motor is small when the electric drive assembly is running, the interaction force between the motor housing and the motor end cover is small, the risk of misalignment between the motor housing and the motor end cover is low, and the risk of sealing failure between the motor housing and the motor end cover is low, thereby reducing the risk of leakage of the lubricating oil entering through the oil inlet of the motor housing, that is, the risk of leakage of the lubricating oil is low.

[0043] In addition, it is understandable that the oil supply device of the electric drive assembly is usually arranged on a side close to the motor, and lubricating oil is provided to the motor and the reducer through the oil supply device. By arranging the oil inlet on the motor housing, the distance between the oil inlet and the oil supply device is closer, thereby simplifying the oil path between the oil supply device and the oil inlet. In this way, the structure of the electric drive assembly can be simplified, which is convenient for the design and manufacture of the electric drive assembly. Among them, the oil supply device may include an oil tank and an oil pump.

[0044] In some embodiments, Figure 3 and Figure 4 As shown, the outer mating section 201 is provided with an inner spline, and the outer spline 14 is loosely matched with the inner spline. The inner mating section 101 is provided with a support portion 15, and the outer side surface of the support portion 15 is loosely matched with the inner side surface of the outer mating section 201, and the first buffer cavity 21 is provided between the outer spline 14 and the support portion 15 in the axial direction of the motor shaft 1.

[0045] The mating part between the external spline 14 and the internal spline is the spline mating part, and the mating part between the support part 15 and the outer side surface of the external mating section 201 is the support mating part. By arranging the external spline 14 and the support part 15 on both sides of the first buffer cavity 21 in the axial direction of the motor shaft 1, respectively, the lubricating oil in the first buffer cavity 21 can flow to both sides of the axial direction of the motor shaft 1, respectively, to achieve lubrication of the spline mating part and the support mating part. Among them, the lubricating oil flowing toward the external spline 14 can achieve lubrication of the spline mating part, and the lubricating oil flowing toward the support part 15 can achieve flow to the support mating part.

[0046] Compared with the related art, in which the lubricating oil first flows through the spline fitting along the axial direction of the motor shaft to absorb the heat at the spline fitting and then flows through the support fitting, or in which the lubricating oil first flows through the support fitting along the axial direction of the motor shaft to absorb the heat at the support fitting and then flows through the spline fitting, the temperature of the lubricating oil flowing to the spline fitting and the support fitting will not be raised, thereby improving the cooling effect of the support fitting and the spline fitting and improving the reliability of the electric drive assembly.

[0047] Alternatively, if Figure 1 As shown, the oil passage 12 extends along the axial direction of the motor shaft 1 , and the motor shaft 1 is further provided with an oil outlet hole 13 extending along its radial direction. The first buffer cavity 21 is connected to the oil passage 12 through the oil outlet hole 13 .

[0048] The center line of the oil passage 12 may coincide with the axis of the motor shaft 1 .

[0049] By setting the oil passage 12 to extend along the axial direction of the motor shaft 1 and providing an oil outlet hole 13 extending along the radial direction of the motor shaft 1, the oil passage 12 is connected with the first cache chamber 21 by utilizing the oil outlet hole 13, which facilitates the processing and manufacturing of the motor shaft 1 and helps to reduce the cost of the electric drive assembly.

[0050] In order to make the technical solution of the present disclosure easier to understand, the following takes the axial direction of the motor shaft 1 as an example to further describe the technical solution of the present disclosure. Figures 1 to 7 shown.

[0051] For example, Figures 1 to 4 As shown, the motor shaft 1 is arranged on the right side of the input shaft 2, the support portion 15 is arranged on the right side of the external spline 14, and the first buffer cavity 21 is arranged between the external spline 14 and the support portion 15 in the left-right direction. A part of the lubricating oil in the first buffer cavity 21 flows leftward to the mating position of the external spline 14 and the internal spline, and another part flows rightward to the mating position of the support portion 15 and the inner side surface of the external mating section 201.

[0052] Optionally, the first cache cavity 21 is annular, and the first cache cavity 21 is arranged around the inner matching segment 101 .

[0053] By setting the first cache cavity 21 to be annular, on the one hand, it is beneficial to increase the volume of the first cache cavity 21, thereby increasing the amount of lubricating oil in the first cache cavity 21, which is beneficial to improve the lubrication and cooling effects of the support fit and spline fit, and further improve the reliability of the electric drive assembly; on the other hand, it is convenient to achieve lubrication and cooling of the support fit and spline fit in the circumferential direction of the motor shaft 1, and further improve the reliability of the electric drive assembly.

[0054] Alternatively, if Figures 1 to 3 As shown, the electric drive assembly further includes a first bearing 3, which is sleeved on the outer matching section 201. Figure 5 As shown, an axial end surface 2011 of the outer fitting segment 201 is provided with an oil discharge groove 24 , and the oil discharge groove 24 penetrates the outer fitting segment 201 in the radial direction of the motor shaft 1 .

[0055] For example, Figure 5 As shown, the right end surface of the outer mating section 201 is provided with an oil discharge groove 24. The lubricating oil flowing through the support portion 15 can flow out through the oil discharge groove 24 under the action of centrifugal force and flow to the first bearing 3 to achieve lubrication and cooling of the first bearing 3. As an example, the first bearing 3 is installed in the cavity of the first bearing seat 4, and the lubricating oil flowing out through the oil discharge groove 24 flows into the cavity of the first bearing seat 4 to lubricate and cool the first bearing 3 installed in the cavity of the first bearing seat 4.

[0056] By providing the oil discharge groove 24 on the axial end face 2011 of the outer mating section 201, the first bearing 3 can be cooled and dissipated when the internal oil circuit of the electric drive assembly is relatively simple, thereby improving the reliability of the electric drive assembly.

[0057] Alternatively, if Figure 5As shown, there are multiple oil unloading grooves 24 , and the multiple oil unloading grooves 24 are arranged at intervals along the circumference of the motor shaft 1 .

[0058] For example, the number of the oil unloading grooves 24 is six, and the six oil unloading grooves 24 are evenly arranged along the circumferential direction of the motor shaft 1 .

[0059] By providing a plurality of oil discharge grooves 24 and arranging the plurality of oil discharge grooves 24 at intervals along the circumference of the motor shaft 1, it is convenient to achieve lubrication and cooling of various locations of the first bearing 3 in the circumference of the motor shaft 1, thereby further improving the reliability of the electric drive assembly.

[0060] Alternatively, if Figure 3 and Figure 4 As shown, the support portion 15 is disposed between the external spline 14 and the axial end face 2011 in the axial direction of the motor shaft 1. The outer side surface of the support portion 15 is provided with an oil groove 151 extending along the axial direction of the motor shaft 1, and the oil groove 151 is communicated with the first buffer cavity 21.

[0061] For example, Figure 4 As shown, the support portion 15 is arranged on the right side of the external spline 14, and the axial end surface 2011 of the external mating section 201 is arranged on the right side of the support portion 15. The outer side surface of the support portion 15 is provided with an oil groove 151 extending in the left-right direction, and the left end of the oil groove 151 is connected to the first buffer cavity 21.

[0062] The support portion 15 is arranged closer to the axial end face 2011 of the outer fitting section 201 relative to the outer spline 14, so that the lubricating oil flowing through the support portion 15 can flow to the first bearing 3 through the oil discharge groove 24. It can be understood that the gap between the support portion 15 and the inner side surface of the outer fitting section 201 is small, resulting in a small amount of lubricating oil flowing to the first bearing 3 through the gap, which easily causes the first bearing 3 to have poor lubrication and cooling effects.

[0063] By setting an oil groove 151 connected to the first cache cavity 21 on the outer side of the support portion 15, the lubricating oil in the first cache cavity 21 can flow to the oil discharge groove 24 through the oil groove 151, and then flow to the first bearing 3 through the oil discharge groove 24, thereby improving the lubrication and cooling effect of the first bearing 3 and further improving the reliability of the electric drive assembly.

[0064] Optionally, there are multiple oil passage grooves 151 , and the multiple oil passage grooves 151 are arranged at intervals along the circumferential direction of the motor shaft 1 .

[0065] By providing a plurality of oil passage grooves 151 and arranging the plurality of oil passage grooves 151 at intervals along the circumference of the motor shaft 1, it is helpful to increase the amount of lubricating oil flowing through the support portion 15, thereby helping to improve the lubrication and cooling effect of the first bearing 3 and further improve the reliability of the electric drive assembly.

[0066] Alternatively, if Figure 4 As shown, the oil groove 151 is a spiral groove.

[0067] Optionally, the outer side surface of the support portion 15 is a spherical surface.

[0068] By setting the outer side surface of the support portion 15 as a spherical surface, the support portion 15 is in line contact with the inner side surface of the outer matching segment 201. Compared with setting the outer side surface of the support portion 15 and the inner side surface of the outer matching segment 201 as cylindrical surfaces, it is possible to avoid the problem that the outer side surface of the support portion 15 and the inner side surface of the outer matching segment 201 are stuck due to a large processing error between the outer side surface of the support portion 15 and the inner side surface of the outer matching segment 201, which makes it difficult to assemble the inner matching segment 101 and the outer matching segment 201.

[0069] Alternatively, if Figure 1 As shown, the electric drive assembly further includes a second bearing 5, which is sleeved on the end of the input shaft 2 away from the motor shaft 1. The motor shaft 1 includes an inner mating section 101, and the input shaft 2 includes an outer mating section 201. The input shaft 2 is provided with a channel 22 that passes through the axial direction of the motor shaft 1, and the outer mating section 201 is sleeved on the inner mating section 101 through the channel 22.

[0070] The outer fitting segment 201 is sleeved on the inner fitting segment 101 through the channel 22 , which can be understood as: the inner fitting segment 101 is inserted into a part of the channel 22 .

[0071] For example, Figure 1 As shown, the input shaft 2 is arranged on the left side of the motor shaft 1, and the external spline 14 is arranged on the left side of the support portion 15. After a portion of the lubricating oil in the first buffer chamber 21 flows to the left to the external spline 14, it will continue to flow to the left through the matching gap between the external spline 14 and the internal spline, and then flow to the left along the channel 22. It can be understood that there is a gap between the input shaft 2 and the reducer end cover. The lubricating oil flowing to the left end of the channel 22 can flow to the second bearing 5 through the gap between the input shaft 2 and the reducer end cover under the action of centrifugal force to achieve lubrication and cooling of the second bearing 5.

[0072] By providing the channel 22, when the internal oil circuit of the electric drive assembly is relatively simple, the second bearing 5 can be cooled and the heat dissipated, thereby improving the reliability of the electric drive assembly.

[0073] As an example, the second bearing 5 is installed in the cavity of the second bearing seat 6, and the lubricating oil flowing out through the channel 22 flows into the cavity of the second bearing seat 6 to lubricate and cool the second bearing 5 installed in the cavity of the second bearing seat 6.

[0074] Optionally, the motor end cover is arranged on a side of the motor housing away from the reducer, and the oil inlet is arranged on the motor end cover. As an example, an end of the oil passage 12 close to the motor end cover forms an oil passage inlet 11, and the oil passage inlet 11 is connected to the oil inlet.

[0075] For example, the motor end cover is provided with an oil inlet hole extending in the radial direction of the motor shaft 1, the oil inlet port is connected to the oil inlet hole, and the oil inlet port and the oil passage inlet 11 are arranged adjacent to each other in the axial direction of the motor shaft 1. The lubricating oil enters the motor end cover through the oil inlet hole, then flows out of the motor end cover through the oil inlet port and flows into the oil passage 12 through the oil passage inlet 11.

[0076] By arranging the oil inlet on the motor end cover, the distance between the motor end cover and the suspension boss is further, and the driving load borne by the motor is smaller when the electric drive assembly is running. As a result, the risk of misalignment between the motor housing and the motor end cover is lower, the risk of seal failure between the motor housing and the motor end cover is lower, and the risk of lubricating oil leakage is lower.

[0077] Alternatively, if Figure 2 and Figure 3 As shown, the motor shaft 1 includes an inner matching section 101, the input shaft 2 includes an outer matching section 201, and the oil passage 12 includes a first section 121 and a second section 122. The first section 121 is arranged at the inner matching section 101, and the second section 122 is arranged at a side of the first section 121 away from the input shaft 2. The motor shaft 1 is provided with a through hole 16 extending along its radial direction, and the through hole 16 is communicated with the second section 122.

[0078] For example, the motor end cover is arranged on the right side of the oil passage 12, and the first section 121 is arranged on the right side of the second section 122. The first section 121 is arranged in the inner mating section 101, so that the oil outlet hole 13 is connected with the first section 121. The lubricating oil enters from the right end of the oil passage 12, and then flows to the left along the oil passage 12. The lubricating oil flowing to the second section 122 can flow out of the motor shaft 1 through the perforation 16, and the motor rotor can be cooled and dissipated. The lubricating oil flowing to the first section 121 can enter the first cache cavity 21 through the oil outlet hole 13, and then the spline mating part and the support mating part can be cooled and dissipated.

[0079] By setting the oil passage 12 to include the first section 121 and the second section 122, and connecting the oil outlet 13 to the first section 121, and connecting the through hole 16 to the second section 122, the lubricating oil can also realize cooling and heat dissipation of the motor rotor. Thus, the oil passage 12 is used for cooling and heat dissipation of the motor shaft 1 and the input shaft 2, and for cooling and heat dissipation of the motor rotor, realizing the integration of the internal heat dissipation system of the motor, which is conducive to further simplifying the structure of the electric drive assembly and facilitating the design and manufacture of the electric drive assembly.

[0080] It should be noted that in the prior art, the motor rotor usually dissipates heat by oil cooling, that is, the motor itself is provided with a heat dissipation oil circuit for oil cooling the motor rotor. The heat dissipation oil circuit includes an oil channel 12 provided on the motor shaft 1. When actually designing the motor shaft 1 and the input shaft 2, it is only necessary to design and manufacture the first buffer cavity 21 and the oil outlet hole 13 connected to the oil channel 12 on the existing motor. In this way, the design and manufacturing cost of the electric drive assembly can be greatly simplified.

[0081] Alternatively, if Figures 1 to 3 As shown, the diameter of the first section 121 is smaller than the diameter of the second section 122. The electric drive assembly also includes an oil pipe 7, which is arranged in the second section 122, and a second cache chamber 23 is formed between the oil pipe 7 and the oil channel 12. The end of the oil pipe 7 away from the input shaft 2 is connected to the oil inlet. The oil pipe 7 is provided with a connecting hole 71 connected to the second cache chamber 23. There are multiple perforations 16, wherein a part of the perforations 16 is arranged on one side of another part of the perforations 16 in the axial direction of the motor shaft 1, and the multiple perforations 16 are all connected to the second cache chamber 23. The connecting hole 71 is arranged between two adjacent perforations 16 in the axial direction of the motor shaft 1.

[0082] It is understandable that the motor shaft 1 is usually placed horizontally, so that the lubricating oil in the second section 122 flows out from the perforations 16 near the oil inlet first, and the excess lubricating oil can continue to flow along the oil passage 12 and flow out from the perforations 16 far from the oil inlet. This results in different amounts of lubricating oil flowing out of the perforations 16 at different positions, and different cooling effects of the lubricating oil on different parts of the motor rotor.

[0083] By setting the diameter of the first section 121 smaller than the diameter of the second section 122, the oil pipe 7 is arranged in the second section 122 so that the second cache chamber 23 is surrounded by the oil pipe 7 and the oil channel 12. In the second section 122, the lubricating oil first flows through the oil pipe 7, then enters the second cache chamber 23 through the connecting hole 71, and then flows out through the perforation 16. By arranging the connecting hole 71 between two adjacent perforations 16 in the axial direction of the motor shaft 1, the lubricating oil in the second cache chamber 23 can flow along the axial sides of the motor shaft 1 respectively, and flow out through the perforations 16 arranged on the side of the connecting hole 71 respectively. As a result, the amount of lubricating oil flowing out of the perforations 16 at different positions is not much different, which improves the cooling effect of the lubricating oil on various parts of the motor rotor.

[0084] Alternatively, if Figures 1 to 3 As shown, the inner diameter of the oil pipe 7 is less than or equal to the diameter of the first section 121. Preferably, the inner diameter of the oil pipe 7 is equal to the diameter of the first section 121.

[0085] By setting the inner diameter of the oil pipe 7 to be less than or equal to the diameter of the first section 121, when the motor shaft 1 is placed horizontally, the lower end of the oil pipe 7 is not lower than the lower end of the first section 121, so that the lubricating oil flowing through the oil pipe 7 can reach the first section 121, so as to ensure lubrication and cooling of the spline mating parts and the support mating parts, thereby improving the reliability of the electric drive assembly.

[0086] Alternatively, if Figures 1 to 3 As shown, the oil passage 12 penetrates the motor shaft 1 in the axial direction of the motor shaft 1, and the port of the oil passage 12 away from the input shaft 2 is connected to the oil inlet. A sealing plug 9 is provided in the oil passage 12, and the sealing plug 9 is sealed with the motor shaft 1, and the sealing plug 9 blocks the port of the oil passage 12 close to the input shaft 2.

[0087] By setting the oil passage 12 to pass through the motor shaft 1 along the axial direction of the motor shaft 1 , the processing and manufacturing of the oil passage 12 is facilitated, thereby facilitating the manufacturing of the electric drive assembly.

[0088] Optionally, the sealing plug 9 is an oil bowl type plug.

[0089] Alternatively, if Figure 6 and Figure 7 As shown, a stopper 123 and a retaining spring 124 are provided in the oil passage 12, and the stopper 123 and the retaining spring 124 are respectively provided on both sides of the second section 122 in the axial direction of the motor shaft 1, and a bushing 8 is sleeved on one end of the oil pipe 7, and the bushing 8 is stopped at the stopper 123 along the axial direction of the motor shaft 1, and the other end of the oil pipe 7 is stopped at the retaining spring 124 along the axial direction of the motor shaft 1. The stopper 123 may be a stopper boss, or a stopper connected to the motor shaft 1 may be provided in the oil passage 12. The bushing 8 is welded to the oil pipe 7 or integrally injection molded.

[0090] For example, Figure 6 As shown, the stopper 123 is arranged on the left side of the clamping spring 124, the bushing is arranged at the left end of the oil pipe 7, the bushing 8 stops at the stopper 123 toward the left, and the right end of the oil pipe 7 stops at the clamping spring 124 toward the right. The oil pipe 7 is positioned in the axial direction of the motor shaft 1. Thus, the installation and removal of the oil pipe 7 are facilitated.

[0091] Alternatively, if Figure 6 As shown, a sealing ring 10 is provided between the bushing 8 and the motor shaft 1. The sealing ring 10 may be a rubber ring.

[0092] For example, a sealing ring groove 81 is provided on the outer side surface of the bushing 8 , and the sealing ring 10 is disposed in the sealing ring groove. The outer side surface of the sealing ring 10 abuts against the inner side surfaces of the motor shaft 1 .

[0093] By providing a sealing ring 10 between the bushing 8 and the motor shaft 1 , the sealing between the oil pipe 7 and the motor shaft 1 can be improved, thereby preventing the lubricating oil from flowing out from the connection between the oil pipe 7 and the motor shaft 1 .

[0094] Reference below Figures 1 to 3 , describing the lubrication method of the electric drive assembly of the embodiment of the utility model, the lubricating oil enters the oil pipe 7 from the right end of the oil pipe 7 through the first oil inlet. Among them, a part of the lubricating oil in the oil pipe 7 enters the second cache chamber 23 through the connecting hole 71, and then flows out to the motor housing through the perforation 16 connected to the second cache chamber 23 to unload the oil and cool the motor rotor; another part of the lubricating oil in the oil pipe 7 continues to flow to the left, and enters the first cache chamber 21 through the oil outlet hole 13 when the motor shaft 1 rotates. A part of the lubricating oil in the first cache chamber 21 first flows to the right to the support part 15 to achieve lubrication and cooling of the support mating part; then it continues to flow to the right to the axial end face 2011 through the gap between the support part 15 and the outer mating section 201 and the oil groove 151; then, under the action of centrifugal force, it flows from the oil unloading groove 24 to the first bearing 3 to achieve lubrication and cooling of the first bearing 3. Another part of the lubricating oil in the first buffer chamber 21 first flows to the left to the external spline 14, thereby lubricating and cooling the mating point between the external spline and the internal spline; then it continues to flow to the left from the gap between the external spline and the internal spline to the channel 22, and continues to flow to the left along the channel 22; then, under the action of centrifugal force, it flows from the gap between the left end of the input shaft 2 and the reducer end cover to the second bearing 5, thereby lubricating and cooling the second bearing 5.

[0095] The electric drive assembly of the embodiment of the utility model supplies oil from the motor end cover of the motor shaft 1 away from the input shaft 2. The motor end cover is less affected by the driving force and the suspension force, and there is no need to separately add an oil-guiding reducer end cover and a sealing structure on the reducer side, thereby improving the sealing reliability of the electric drive assembly and effectively avoiding the problem of lubricating oil leakage in the electric drive assembly.

[0096] The vehicle of the embodiment of the utility model comprises the electric drive assembly described in any of the above embodiments, wherein the vehicle can be a pure electric vehicle or a hybrid electric vehicle.

[0097] Since the electric drive assembly has a lower risk of lubricating oil leakage, the vehicle of the embodiment of the utility model has a lower risk of lubricating oil leakage and a better user experience.

[0098] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are illustrative and cannot be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. An electric drive assembly, characterized in that: include: A motor, wherein the motor comprises a motor housing and a motor shaft, wherein the motor housing comprises a motor case and a motor end cover sealedly connected to the motor case, wherein the motor shaft is disposed in the motor housing, wherein the motor housing is provided with an oil inlet, and wherein the motor shaft is provided with an oil passage, wherein the oil passage is communicated with the oil inlet; A speed reducer, the speed reducer comprising an input shaft; Among them, one of the motor shaft and the input shaft includes an inner mating section, and the other includes an outer mating section, the outer mating section is sleeved on the inner mating section and has a clearance fit with the inner mating section, a first cache cavity is formed between the outer mating section and the inner mating section, and the first cache cavity is connected to the oil channel.

2. The electric drive assembly according to claim 1, characterized in that: The inner mating section is provided with an external spline, the outer mating section is provided with an internal spline, and the external spline and the internal spline are clearance-matched; The inner matching section is provided with a supporting portion, and the outer side surface of the supporting portion and the inner side surface of the outer matching section are clearance-matched; Wherein, the first buffer cavity is arranged between the external spline and the support portion in the axial direction of the motor shaft.

3. The electric drive assembly according to claim 2, characterized in that: The electric drive assembly also includes a first bearing, which is sleeved on the outer mating section. The axial end surface of the outer mating section is provided with an oil discharge groove, and the oil discharge groove penetrates the outer mating section in the radial direction of the motor shaft.

4. The electric drive assembly according to claim 3, characterized in that: The support portion is arranged between the external spline and the axial end face in the axial direction of the motor shaft, and the outer side surface of the support portion is provided with an oil groove extending along the axial direction of the motor shaft, and the oil groove is connected to the first cache cavity.

5. The electric drive assembly according to any one of claims 1 to 4, characterized in that: The electric drive assembly further includes a second bearing, wherein the second bearing is sleeved on an end of the input shaft away from the motor shaft; The motor shaft includes the inner fitting section, the input shaft includes the outer fitting section, the input shaft is provided with a channel penetrating along the axial direction of the motor shaft, and the outer fitting section is sleeved on the inner fitting section through the channel.

6. The electric drive assembly according to any one of claims 1 to 4, characterized in that: The motor shaft includes the inner matching section, the input shaft includes the outer matching section, and one end of the oil passage away from the input shaft is connected to the oil inlet; The oil passage includes a first section and a second section, wherein the first section is arranged at the inner fitting section, and the second section is arranged at a side of the first section away from the input shaft, and the motor shaft is provided with a through hole extending along its radial direction, and the through hole is communicated with the second section.

7. The electric drive assembly according to claim 6, characterized in that: The diameter of the first section is smaller than the diameter of the second section. The electric drive assembly further comprises an oil pipe, which is arranged in the second section. A second buffer cavity is formed between the oil pipe and the oil passage. One end of the oil pipe away from the input shaft is connected to the oil inlet. The oil pipe is provided with a communication hole connected to the second buffer cavity. The number of the perforations is multiple, wherein a portion of the perforations are arranged on one side of another portion of the perforations in the axial direction of the motor shaft, a plurality of the perforations are connected to the second cache cavity, and the connecting hole is arranged between two adjacent perforations in the axial direction of the motor shaft.

8. The electric drive assembly according to claim 7, characterized in that: The inner diameter of the oil pipe is smaller than or equal to the diameter of the first section.

9. The electric drive assembly according to any one of claims 1 to 4, characterized in that: The motor shaft includes the inner matching section, the input shaft includes the outer matching section, the oil passage penetrates the motor shaft along the axial direction of the motor shaft, a port of the oil passage away from the input shaft is communicated with the oil inlet, a sealing plug is provided in the oil passage, the sealing plug is sealingly connected to the motor shaft, and the sealing plug blocks the port of the oil passage close to the input shaft; and / or The motor end cover is arranged on a side of the motor housing away from the reducer, and the oil inlet is arranged on the motor end cover.

10. A vehicle, characterized in that: Comprising the electric drive assembly according to any one of claims 1-9.

Images