Motor driving assembly and vehicle

Abstract

The invention relates to a motor driving assembly and a vehicle. The motor driving assembly comprises a shell, a driving motor, a speed reducer and a lubricating system. The shell is internally provided with a motor cavity and a speed reduction cavity, the driving motor is arranged in the motor cavity, the driving motor comprises a stator winding and a rotor, the rotor penetrates through the stator winding and is rotationally connected with the shell, the speed reducer is arranged in the speed reduction cavity and is connected with the rotor, and the motor is arranged in the speed reduction cavity. The lubricating system comprises a main oil supply way and a first branch way which are arranged in the shell, the main oil supply way is arranged on one radial side of the shell and communicated with the stator winding, the first branch way is arranged between the motor cavity and the speed reduction cavity, one end of the first branch way is communicated with the main oil supply way, and the other end of the first branch way is communicated with the speed reduction cavity. And the other end of the first branch is communicated with the speed reduction cavity. The motor driving assembly is compact in structure, and the axial size of the motor driving assembly can be reduced.

Description

Technical Field

[0001] The present invention relates to the field of vehicle technology, and in particular to a motor drive assembly and a vehicle. Background Art

[0002] With the rapid development of the new energy vehicle market, the demand for motor drive assembly in terms of integration and efficiency is getting higher and higher. In order to improve the integration level of the motor drive assembly, the drive motor and reducer can be integrated in a set of housing.

[0003] In the related art, the motor drive assembly actively lubricates the drive motor separately through the cooling oil circuit, and the reducer adopts the internal gear stirring method to perform passive lubrication. However, the above-mentioned split lubrication scheme occupies a large axial space of the motor drive assembly, which is not conducive to the compact design of the motor drive assembly. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, an embodiment of the present invention provides a motor drive assembly with a small axial size and a compact structure.

[0006] An embodiment of the present invention further provides a vehicle.

[0007] The motor drive assembly of an embodiment of the present invention includes: a shell, in which a motor cavity and a reduction cavity are provided; a drive motor, which is arranged in the motor cavity, and the drive motor includes a stator winding and a rotor, and the rotor is inserted through the stator winding and is rotatably connected to the shell; a reducer, which is arranged in the reduction cavity and is connected to the rotor; a lubrication system, which includes a main oil supply passage and a first branch passage arranged in the shell, the main oil supply passage is arranged on one radial side of the shell and is connected to the stator winding, the first branch passage is arranged between the motor cavity and the reduction cavity, one end of the first branch passage is connected to the main oil supply passage, and the other end of the first branch passage is connected to the reduction cavity.

[0008] According to the motor drive assembly of the embodiment of the present invention, the drive motor and the reducer can be lubricated together through the main oil supply channel and the first branch. Since the main oil supply channel is arranged on one side of the radial direction of the outer casing, the occupation of the axial space of the outer casing can be reduced. Moreover, since the first branch is arranged between the motor cavity and the reduction cavity, the first branch can be arranged in the installation space between the drive motor and the reducer, so that the overall structure of the motor drive assembly is more compact, which is conducive to reducing the axial size of the motor drive assembly.

[0009] In some embodiments, the housing has a partition, and the motor chamber and the deceleration chamber are respectively arranged on both sides of the partition, and in the direction from the radial outer end of the partition to the radial inner end of the partition, the partition gradually extends obliquely away from the deceleration chamber, and the first branch is arranged on the partition and is consistent with the extension direction of the partition.

[0010] In some embodiments, the drive motor also includes a first bearing, one end of the rotor is rotatably connected to the housing through the first bearing, the first branch has a first flow channel and a second flow channel, the first flow channel is connected to the deceleration chamber, and the second flow channel is connected to the first bearing.

[0011] In some embodiments, the drive motor also includes a second bearing, and the other end of the rotor is rotatably connected to the housing through the second bearing. The lubrication system also includes a second branch, and the second branch extends radially along the housing. One end of the second branch is connected to the main oil supply circuit, and the other end of the second branch is connected to the second bearing.

[0012] In some embodiments, the lubrication system further includes a third branch, which is arranged in the rotor along the axial direction of the rotor, one end of the third branch is connected to the second branch, and the other end of the third branch is connected to the deceleration chamber.

[0013] In some embodiments, the reducer includes a sun gear and multiple planetary gear sets, the sun gear is drivingly connected to the rotor and the multiple planetary gear sets, the first branch is connected to the planetary gear sets, and a first oil outlet is provided on the rotor, and the first oil outlet is connected to the third branch and the sun gear.

[0014] In some embodiments, a side wall of the rotor is provided with a second oil outlet hole, the second oil outlet hole penetrates the rotor in a radial direction of the rotor, and the second oil outlet hole is communicated with the motor cavity.

[0015] In some embodiments, the motor drive assembly also includes an oil pipe, which is arranged at the end of the rotor away from the reducer, the oil pipe is connected to the rotor and the casing, and a first hole section, a second hole section and a third hole section are provided on the oil pipe, the first hole section extends along the axial direction of the oil pipe and is connected to the third branch, the second hole section and the third hole section both extend along the radial direction of the oil pipe and are connected to the first hole section, the second branch is connected to the second hole section, and the third hole section is connected to the second bearing.

[0016] In some embodiments, the oil pipe includes a tube body and a flange, the first hole section, the second hole section and the third hole section are all arranged on the tube body, the flange is arranged on the outer peripheral wall of the tube body and is in contact with the side wall of the outer shell, a positioning block is provided on the end face of the flange, and a positioning groove cooperating with the positioning block is provided on the outer shell.

[0017] In some embodiments, oil rings are provided at both ends of the stator winding, two connecting holes are provided on the outer casing, the two connecting holes correspond one-to-one to the two oil rings, a first oil inlet hole is provided on the oil ring, and the main oil supply path is connected to the first oil inlet hole through the connecting hole.

[0018] In some embodiments, the lubrication system also includes a main oil return circuit, a first oil return channel and a second oil return channel. The main oil return circuit, the first oil return channel and the second oil return channel are all arranged in the outer casing. The main oil return circuit is arranged adjacent to the lower end of the stator winding, and the main oil supply circuit is arranged adjacent to the upper end of the stator winding. The first oil return channel is connected to the motor cavity and the main oil return circuit, and the second oil return channel is connected to the deceleration cavity and the main oil return circuit.

[0019] In some embodiments, an upwardly extending baffle is provided at the bottom of the deceleration chamber, and the baffle divides the deceleration chamber into a deceleration zone and an overflow zone. The reducer is installed in the deceleration zone, and the oil in the deceleration zone can overflow upward into the overflow zone. The second oil return channel is connected to the overflow zone.

[0020] In some embodiments, an oil return branch hole is provided on the baffle plate, and the oil return branch hole is arranged adjacent to the lower end of the baffle plate and is connected to the reducer and the overflow area.

[0021] In some embodiments, the housing includes two symmetrically arranged shell units, each of the shell units is provided with the deceleration chamber and the motor chamber, the drive motor, the reducer and the lubrication system are each two groups, and the two groups of the drive motor, the reducer and the lubrication system are respectively arranged in the two shell units.

[0022] In some embodiments, a third branch extending along the axial direction is provided in the rotor, and the third branch is connected to the deceleration chamber. The motor drive assembly also includes an oil pipe, and the oil pipe is provided between the two housing units. The oil pipe has two unconnected tube bodies, and the two tube bodies are connected to the two rotors one by one. The main oil supply circuit is connected to the third branch through the tube body.

[0023] A vehicle according to another embodiment of the present invention includes the motor drive assembly according to the embodiment of the present invention.

[0024] According to the vehicle of the embodiment of the present invention, the drive motor and the reducer can be lubricated together through the main oil supply channel and the first branch. Since the main oil supply channel is arranged on one side of the radial direction of the outer casing, the occupation of the axial space of the outer casing can be reduced. Moreover, since the first branch is arranged between the motor cavity and the reduction cavity, the first branch can be arranged by utilizing the installation space between the drive motor and the reducer, so that the overall structure of the motor drive assembly is more compact, which is beneficial to reducing the axial size of the motor drive assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of a motor drive assembly according to an embodiment of the present invention.

[0026] Figure 2 is a cross-sectional view of a motor drive assembly according to an embodiment of the present invention.

[0027] Figure 3 It is a partial cross-sectional view of the motor drive assembly according to an embodiment of the present invention.

[0028] Figure 4 2 is another partial schematic diagram of the motor drive assembly according to an embodiment of the present invention.

[0029] Figure 5 yes Figure 4 A is an enlarged view of the middle image.

[0030] Figure 6 Schematic diagram of an oil pipe of a motor drive assembly according to an embodiment of the present invention.

[0031] Figure 7 It is a simplified diagram of the oil circuit flow of a single lubrication system of the motor drive assembly according to an embodiment of the present invention.

[0032] Reference numerals:

[0033] 1. Shell; 11. Motor cavity; 12. Speed ​​reduction cavity; 121. Speed ​​reduction area; 122. Overflow area; 13. Baffle; 131. Oil return branch hole; 14. Communication hole; 15. Shell unit; 16. Main oil inlet hole; 17. Partition plate;

[0034] 2. drive motor; 21. stator winding; 211. oil ring; 2111. first oil inlet hole; 212. stator core; 213. winding coil; 22. rotor; 221. first oil outlet hole; 222. second oil outlet hole; 23. first bearing; 24. second bearing; 25. sealing plug;

[0035] 3. Speed ​​reducer; 31. Sun gear; 32. Planetary gear set; 33. Planet carrier bearing; 34. Planetary gear bearing; 35. Big gear ring;

[0036] 41, main oil supply circuit; 421, first branch circuit; 4211, first flow channel; 4212, second flow channel; 422, second branch circuit; 423, third branch circuit; 43, main oil return circuit; 441, first oil return channel; 442, second oil return channel;

[0037] 5. oil pipe; 51. pipe body; 511. first hole section; 512. second hole section; 513. third hole section; 52. flange; 521. positioning block;

[0038] 61. Heat exchanger; 62. Oil filter; 63. Oil pump; 64. Filter. DETAILED DESCRIPTION

[0039] 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 should not be understood as limiting the present invention.

[0040] Please refer to the following Figures 1 to 7 A motor drive assembly and a vehicle according to an embodiment of the present invention are described.

[0041] like Figures 2 to 4 and Figure 7 As shown, the motor drive assembly of the embodiment of the present invention includes: a housing 1, a drive motor 2, a reducer 3 and a lubrication system.

[0042] A motor cavity 11 and a reduction cavity 12 are provided in the outer shell 1, and the drive motor 2 is provided in the motor cavity 11. The drive motor 2 includes a stator winding 21 and a rotor 22. The rotor 22 is inserted into the stator winding 21, and the rotor 22 is rotatably connected to the outer shell 1. The reducer 3 is provided in the reduction cavity 12 and is transmission-connected to one end of the rotor 22. The lubrication system includes a main oil supply path 41 and a first branch 421. The main oil supply path 41 and the first branch 421 are both provided in the outer shell 1. The main oil supply path is arranged on one radial side of the outer shell 1 and is connected to the stator winding 21. The first branch 421 is provided between the motor cavity 11 and the reduction cavity 12. One end of the first branch 421 is connected to the main oil supply path 41, and the other end of the first branch 421 is connected to the reduction cavity 12.

[0043] According to the motor drive assembly of the embodiment of the present invention, the drive motor 2 and the reducer 3 can be lubricated together through the main oil supply channel 41 and the first branch 421. Since the main oil supply channel is arranged on one side of the radial direction of the outer casing 1, the occupation of the axial space of the outer casing 1 can be reduced. Moreover, since the first branch 421 is arranged between the motor cavity 11 and the reduction cavity 12, the first branch 421 can be arranged in the installation space between the drive motor 2 and the reducer 3, so that the overall structure of the motor drive assembly is more compact, which is beneficial to reducing the axial size of the motor drive assembly.

[0044] In addition, compared with the solution of "independent lubrication of reducer", the motor drive assembly of the embodiment of the present invention can reduce the number of parts and components and the design size. It can be understood that in the solution of "independent lubrication of reducer", the wall thickness of the outer shell in the axial direction will be increased, and a separate oil circuit needs to be designed for the reducer, resulting in redundant design of the entire oil circuit system of the motor drive assembly and a low degree of integration. The motor drive assembly of the embodiment of the present invention integrates the lubrication system to lubricate the drive motor 2 and the reducer 3 together through the main oil supply circuit 41 and the first branch 421, and reduces the occupation of the oil circuit in the axial space of the motor drive assembly, which is conducive to shortening the axial size of the motor drive assembly.

[0045] For example, Figure 4 As shown, the housing 1 has a partition 17, and the motor chamber 11 and the reduction chamber 12 are respectively arranged on both sides of the partition 17. In the direction from the radial outer end of the partition 17 to the radial inner end of the partition 17, the partition 17 gradually extends obliquely away from the reduction chamber 12, and the first branch 421 is provided on the partition 17 and is consistent with the extension direction of the partition 17.

[0046] It is understandable that if Figure 3 and Figure 4 As shown, the partition 17 divides the space of the housing 1 into a reduction chamber 12 and a motor chamber 11. The partition 17 is provided with a mounting hole for penetrating the rotor 22. The partition 17 has a certain inclination angle. In the direction from the radial outer end of the partition 17 to the radial inner end of the partition 17, the partition 17 gradually extends toward the motor chamber 11 to avoid the installation of the reducer 3 and the drive motor 2, thereby making the parts arrangement in the housing 1 more compact. The inclination angle of the first branch 421 is substantially consistent with the inclination angle of the partition 17 to save the layout space of the oil circuit.

[0047] Alternatively, if Figure 4 As shown, the drive motor 2 also includes a first bearing 23, one end of the rotor 22 is rotatably connected to the housing 1 through the first bearing 23, and the first branch 421 has a first flow channel 4211 and a second flow channel 4212, the first flow channel 4211 is connected to the reduction chamber 12, and the second flow channel 4212 is connected to the first bearing 23. It can be understood that the first branch 421 can not only introduce lubricating oil into the reduction chamber 12 to lubricate the reducer 3, but also introduce lubricating oil into the position of the first bearing 23 to lubricate the first bearing 23. In other words, the motor drive assembly of the embodiment of the present invention can use the first branch 421 to lubricate the reducer 3 and the first bearing 23 at the same time, further reducing the number of oil circuits arranged and improving the compactness of the lubrication system arrangement.

[0048] Specifically, Figure 4As shown, the first flow channel 4211 and the second flow channel 4212 are arranged at the radial inner end of the first branch 421, the first flow channel 4211 generally extends along the axial direction of the housing 1, and is communicated with the reduction chamber 12, and the oil flowing out of the first flow channel 4211 can lubricate the gears and bearings of the reducer 3. The second flow channel 4212 generally extends along the radial direction of the housing 1 and is communicated with the installation space of the first bearing 23, thereby lubricating the first bearing 23.

[0049] Alternatively, if Figure 3 As shown, the drive motor 2 further includes a second bearing 24, and the other end of the rotor 22 is rotatably connected to the housing 1 through the second bearing 24. The lubrication system further includes a second branch 422, and the second branch 422 extends radially along the housing 1. One end (radial outer end) of the second branch 422 is connected to the main oil supply circuit 41, and the other end (radial inner end) of the second branch 422 is connected to the second bearing 24. It can be understood that the second branch 422 can divert the oil of the main oil supply circuit 41, and the diverted oil can enter the second bearing 24 to lubricate the second bearing 24.

[0050] like Figure 3 and Figure 4 As shown, the lubrication system also includes a third branch 423, which is arranged in the rotor 22 along the axial direction of the rotor 22, and one end of the third branch 423 is connected to the second branch 422. It can be understood that a part of the oil in the second branch 422 will be diverted to the second bearing 24, and the other part will be diverted to the rotor 22 to cool the rotor 22 of the drive motor 2. Since the main oil supply circuit 41 can cool the stator winding 21, the third branch 423 can cool the rotor 22, so that the overall cooling effect of the drive motor 2 is better. In addition, since the second branch 422 and the third branch 423 are arranged in series, the complexity of the oil circuit design can be reduced.

[0051] like Figure 4 As shown, the other end of the third branch 423 is connected to the speed reduction chamber 12. In other words, the third branch 423 can not only lubricate and cool the rotor 22, but also introduce the oil into the speed reduction chamber 12, thereby further lubricating and cooling the speed reducer 3. The motor drive assembly of the embodiment of the present invention cooperates with the third branch 423 to lubricate and cool the rotor 22 and the speed reducer 3, thereby reducing the number of oil circuits, making the structure of the lubrication system compact, and helping to reduce the space occupied by the lubrication system for the motor drive assembly.

[0052] Alternatively, if Figure 2 and Figure 4As shown, the reducer 3 includes a sun gear 31 and a plurality of planetary gear sets 32, the sun gear 31 is drivingly connected with the rotor 22 and the plurality of planetary gear sets 32, the first branch 421 is in communication with the planetary gear set 32, the rotor 22 is provided with a first oil outlet 221, the first oil outlet 221 is in communication with the third branch 423 and the sun gear 31. It can be understood that the reducer 3 of the embodiment of the present invention is a planetary reducer 3, the first branch 421 can lubricate the planetary carrier bearing 33 and the planetary wheel bearing 34 of the planetary wheel set 32. The third branch 423 can lubricate the tooth surface of the sun gear 31 through the first oil outlet 221. The motor drive assembly of the embodiment of the present invention utilizes the first branch 421 and the third branch 423 to cooperate with each other, and can lubricate and cool different positions of the reducer 3, which is conducive to improving the uniformity of lubrication and cooling of the reducer 3.

[0053] Specifically, Figure 2 and Figure 7 As shown, the reducer 3 also includes a large ring gear 35, which is installed in the reduction chamber 12 and is transmission-connected to the plurality of planetary gear sets 32. The oil entering the reduction chamber 12 can not only lubricate the sun gear 31 and the planetary gear shafts, but also lubricate the tooth surface of the large ring gear 35.

[0054] Furthermore, if Figure 4 As shown, the side wall of the rotor 22 is provided with a second oil outlet hole 222, the second oil outlet hole 222 penetrates the rotor 22 in the radial direction of the rotor 22, and the second oil outlet hole 222 is connected to the motor cavity 11. It can be understood that when the rotor 22 rotates, the second oil outlet hole 222 can be thrown out in the radial direction of the rotor 22 to fully cool the rotor 22. For example, there are multiple second oil outlet holes 222, and the multiple second oil outlet holes 222 are arranged at intervals along the axial direction and circumferential direction of the rotor 22.

[0055] For example, Figure 4 As shown, a sealing plug 25 is provided at one end of the rotor 22 adjacent to the reduction chamber 12 , and the sealing plug 25 blocks the port of the third branch 423 to avoid the problem of oil channel pressure relief and improve the lubrication and cooling effect of the reducer 3 .

[0056] In some embodiments, Figure 3 and Figure 5 As shown, the lubrication system also includes an oil pipe 5, which is arranged at one end of the rotor 22 away from the reducer 3, and the oil pipe 5 is connected to the rotor 22 and the housing 1. The oil pipe 5 is provided with a first hole section 511, a second hole section 512 and a third hole section 513. The first hole section 511 extends along the axial direction of the oil pipe 5 and is connected to the third branch 423. The second hole section 512 and the third hole section 513 both extend along the radial direction of the oil pipe 5 and are both connected to the first hole section 511. The second branch 422 is connected to the second hole section 512, and the third hole section 513 is connected to the second bearing 24.

[0057] It is understandable that the oil pipe 5 can be used as a transition piece for the second branch 422 and the third branch 423. The oil pipe 5 and the housing 1 can be manufactured separately and then assembled together, thereby reducing the complexity of the oil circuit design and facilitating the manufacturing of the housing 1.

[0058] like Figure 3 and Figure 6 As shown, the first hole section 511 is opposite to and communicates with the third branch 423 on the rotor 22, and the second hole section 512 extends in the radial direction of the oil pipe 5 and communicates with the first hole section 511 and the second branch 422, so that the oil in the second branch 422 can enter the first hole section 511 through the second hole section 512, and then be introduced into the third branch 423 through the first hole section 511. Since the third hole section 513 extends in the radial direction of the oil pipe 5 and communicates with the first hole section 511 and the second bearing 24, the oil in the second branch 422 can enter the first hole section 511 through the second hole section 512, and then be introduced into the installation position of the second bearing 24 through the third hole section 513.

[0059] Specifically, Figure 6 As shown, the oil pipe 5 includes a pipe body 51 and a flange 52, a first hole section 511, a second hole section 512 and a third hole section 513 are all provided on the pipe body 51, the flange 52 is provided on the outer peripheral wall of the pipe body 51 and is fitted with the side wall of the housing 1, a positioning block 521 is provided on the end surface of the flange 52, and a positioning groove matched with the positioning block 521 is provided on the housing 1. When installing the oil pipe 5, the operator can fit the flange 52 with the side wall of the housing 1 and insert the positioning block 521 into the positioning groove, so that the second hole section 512 and the third hole section 513 can be aligned with the preset position on the housing 1, thereby improving the smoothness of oil flow.

[0060] A sealing ring is provided between the flange 52 and the side wall of the housing 1, and a static seal is formed between the flange 52 and the housing 1. The tube body 51 is coaxially arranged with the rotor 22 and penetrates into the housing 1. A sealing ring is also provided between the tube body 51 and the assembly hole of the housing 1, and a static seal is formed between the tube body 51 and the housing 1. A sealing ring is provided between the tube body 51 and the rotor 22, and a dynamic seal is formed between the tube body 51 and the rotor 22.

[0061] In some embodiments, Figure 3 and Figure 7As shown, oil rings 211 are provided at both ends of the stator winding 21, and two connecting holes 14 are provided on the housing 1. The two connecting holes 14 correspond to the two oil rings 211 one by one. The oil ring 211 is provided with a first oil inlet hole 2111, and the main oil supply path 41 is connected to the first oil inlet hole 2111 through the connecting hole 14. It can be understood that the main oil supply path 41 extends along the axial direction of the housing 1, and the two connecting holes 14 are arranged at intervals along the axial direction of the main oil supply path 41. The main oil supply path 41 is connected to the first oil inlet holes 2111 on the two oil rings 211 through the two connecting holes 14. The motor drive assembly of the embodiment of the present invention can fully cool the stator winding 21 by arranging the oil circuit in the above structure to improve the cooling effect of the stator winding 21.

[0062] It is understandable that if Figure 3 and Figure 7 As shown, the stator winding 21 also includes a stator core 212 and a winding coil 213. Two oil rings 211 are respectively installed at the ends of the stator core 212. The oil rings 211 are connected to the cooling channel in the stator core 212, and the oil rings 211 can spray oil to the ends of the winding coil 213, thereby fully cooling the stator winding 21 to improve the cooling effect of the stator winding 21.

[0063] Alternatively, if Figure 4 and Figure 5 As shown, the lubrication system also includes a main oil return circuit 43, a first oil return channel 441 and a second oil return channel 442. The main oil return circuit 43, the first oil return channel 441 and the second oil return channel 442 are all arranged in the housing 1. The main oil return circuit 43 is arranged adjacent to the lower end of the stator winding 21, and the main oil supply circuit 41 is arranged adjacent to the upper end of the stator winding 21. The first oil return channel 441 is connected to the motor cavity 11 and the main oil return circuit 43, and the second oil return channel 442 is connected to the deceleration cavity 12 and the main oil return circuit 43.

[0064] It is understandable that the motor drive assembly of the embodiment of the present invention adopts gravity oil return to circulate the oil, that is, the main oil supply circuit 41 can disperse the oil to the reducer 3 and the drive motor 2, and then gather to the bottom of the reduction chamber 12 and the motor chamber 11 under the action of gravity. Since the first oil return channel 441 is connected to the motor chamber 11 and the main oil return circuit 43, and the second oil return channel 442 is connected to the reduction chamber 12 and the main oil return circuit 43, the circulated oil can be recovered through the main oil return channel. The motor drive assembly of the embodiment of the present invention can improve the cooling cycle efficiency of the motor drive assembly and reduce the complexity of the oil circuit design by adopting the above-mentioned structural arrangement for the lubrication system.

[0065] Alternatively, if Figure 5As shown, a baffle 13 extending upward is provided at the bottom of the deceleration chamber 12, and the baffle 13 divides the deceleration chamber 12 into a deceleration area 121 and an overflow area 122. The reducer 3 is installed in the deceleration area 121, and the oil in the deceleration area 121 can overflow upward into the overflow area 122. The second oil return channel 442 is connected to the overflow area 122.

[0066] The inventors of the present application discovered through experimental research that when the motor drive assembly in the related technology is working, the gears of the reducer 3 rotate at high speed, causing the oil in the reduction chamber 12 to mix with a large amount of air and flow back into the main oil return path 43, which can easily cause the oil pump 63 to be sucked empty, affecting the cooling and lubrication effect of the motor drive assembly.

[0067] The present application can prevent the air and oil stirred up by the reducer 3 from directly entering the second oil return channel 442 by setting an upwardly extending baffle 13 at the bottom of the speed reduction chamber 12. It can be understood that the air and oil stirred up in the speed reduction area 121 will be thrown upward (overflow) to the overflow area 122, so that the air and oil are automatically separated. In other words, the oil can overflow upward over the baffle 13 into the overflow area 122, and then pass into the main oil return circuit 43 to prevent the return oil from mixing with air, thereby ensuring the heat dissipation and performance output of the system.

[0068] Alternatively, if Figure 5 As shown, the baffle 13 is provided with an oil return branch hole 131, which is arranged adjacent to the lower end of the baffle 13 and is connected to the reducer 3 and the overflow area 122. It can be understood that the oil in the reduction area 121 can be discharged into the main oil return path 43 through the oil return branch hole 131, thereby avoiding the formation of a dead oil cavity in the reduction area 121, so as to avoid the problem that the oil in the reduction area 121 cannot be normally and completely discharged when the oil in the housing 1 is emptied.

[0069] It can be understood that the oil return branch hole 131 is located at the lowest point of the baffle 13, ensuring that all the oil in the reduction chamber 12 can be discharged. The channel cross-section in the oil return branch hole 131 is small, which can ensure that when the reducer 3 is running, only a small amount of oil and air enters the main oil return path 43 through this oil return branch hole 131.

[0070] In some embodiments, Figure 1 and Figure 2As shown, the housing 1 includes two symmetrically arranged housing units 15, each housing unit 15 is provided with a speed reduction chamber 12 and a motor chamber 11, and the drive motor 2, the speed reducer 3 and the lubrication system are two groups, and the two groups of drive motors 2, speed reducers 3 and lubrication systems are arranged in the two housing units 15 respectively. It can be understood that the motor drive assembly of the embodiment of the present invention is a coaxial dual-motor drive assembly, the two drive motors 2 are symmetrically arranged about the center plane P1 of the housing 1, one speed reducer 3 is located on the left side of the drive motor 2, and the other speed reducer 3 is located on the right side of the drive motor 2, and the two speed reducers 3 are symmetrically arranged about the center plane of the housing 1. Correspondingly, a group of lubrication systems are arranged in each housing unit 15, and the two groups of lubrication systems are independent of each other and do not interfere with each other.

[0071] For the dual-motor drive assembly of the embodiment of the present invention, since the lubrication system adopts the above-mentioned structural arrangement, the axial space occupied by the oil circuit of the dual-motor drive assembly can be reduced to improve the compactness of the dual-motor drive assembly, which is beneficial to reducing the design width of the vehicle.

[0072] Alternatively, if Figure 3 and Figure 6 As shown, the rotor 22 is provided with a third branch 423 extending along its axial direction, and the third branch 423 is connected to the speed reduction chamber 12. The motor drive assembly also includes an oil pipe 5, which is provided between the two housing units 15. The oil pipe 5 has two tube bodies 51 that are not connected to each other. The two tube bodies 51 are connected to the two rotors 22 in a one-to-one correspondence, and the main oil supply path 41 is connected to the third branch 423 through the tube bodies 51. In the present application, by providing the oil pipe 5 between the two housings, the respective lubrication systems are connected through the two tube bodies 51, and compared with the independent oil circuits in the two housing units 15, the overall axial size of the housing 1 can be reduced.

[0073] In the example of the application, the two tube bodies 51 are located on the same axis and are symmetrically arranged about the flange 52. The two tube bodies 51 are respectively connected to the corresponding second branch 422 and the third branch 423, and the oil paths of the two tube bodies 51 are not connected to each other. The end faces of the two shell units 15 are fitted to each other, and the flange 52 is clamped between the two shell units 15. The flange 52 is sealed and connected to the two shell units 15, thereby ensuring that the oil pipe 5 is not affected by salt spray and ensuring the reliability of the oil pipe 5 sealing.

[0074] Specifically, Figure 1 and Figure 7As shown, each lubrication system corresponds to a set of heat exchanger 61, oil filter 62, oil pump 63 and filter 64 structures. The heat exchanger 61, oil filter 62, oil pump 63 and filter 64 are connected in sequence, and the oil flowing out of the main return oil circuit 43 can be filtered through the filter 64 and then enter the oil pump 63. The oil pump 63 pressurizes the oil, and the oil passes through the oil filter 62 and the heat exchanger 61 and then enters the main oil supply circuit 41 to realize the circulation of the motor drive assembly. Among them, the heat exchanger 61, oil filter 62 and oil pump 63 are arranged on one side of the radial direction of the housing unit 15 to reduce the occupation of the axial space of the motor drive assembly.

[0075] Among them, Figure 4 As shown, a main oil inlet hole 16 is provided on one radial side of the housing unit 15 , and the main oil inlet hole 16 is connected to the main oil supply path 41 and the heat exchanger 61 , and the oil after heat exchange in the heat exchanger 61 can enter the main oil supply path 41 through the main oil inlet hole 16 .

[0076] A vehicle according to another embodiment of the present invention comprises the motor drive assembly according to the embodiment of the present invention. The technical advantages of the vehicle according to the embodiment of the present invention are the same as the technical advantages of the motor drive assembly according to the above embodiment, which will not be described in detail here.

[0077] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0078] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0079] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0080] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0081] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction 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 described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0082] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are exemplary and are not to 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. A motor drive assembly, characterized in that: include: A housing, wherein a motor cavity and a reduction cavity are arranged in the housing; A drive motor, the drive motor is arranged in the motor cavity, the drive motor comprises a stator winding and a rotor, the rotor is passed through the stator winding and is rotatably connected to the housing; A reducer, the reducer is arranged in the reduction chamber and connected to the rotor; A lubrication system, the lubrication system comprising a main oil supply passage and a first branch passage provided in the outer casing, the main oil supply passage being arranged on one radial side of the outer casing and being connected to the stator winding, the first branch passage being provided between the motor cavity and the reduction cavity, one end of the first branch passage being connected to the main oil supply passage, and the other end of the first branch passage being connected to the reduction cavity.

2. The motor drive assembly according to claim 1, characterized in that: The outer shell has a partition, and the motor cavity and the deceleration cavity are respectively arranged on both sides of the partition. In the direction from the radial outer end of the partition to the radial inner end of the partition, the partition gradually extends obliquely away from the deceleration cavity, and the first branch is arranged on the partition and is consistent with the extension direction of the partition.

3. The motor drive assembly according to claim 1, characterized in that: The drive motor also includes a first bearing, one end of the rotor is rotatably connected to the housing through the first bearing, the first branch has a first flow channel and a second flow channel, the first flow channel is connected to the deceleration chamber, and the second flow channel is connected to the first bearing.

4. The motor drive assembly according to claim 1, characterized in that: The drive motor also includes a second bearing, and the other end of the rotor is rotatably connected to the housing through the second bearing. The lubrication system also includes a second branch, which extends radially along the housing, one end of the second branch is connected to the main oil supply circuit, and the other end of the second branch is connected to the second bearing.

5. The motor drive assembly according to claim 4, characterized in that: The lubrication system further includes a third branch, which is arranged in the rotor along the axial direction of the rotor, one end of the third branch is communicated with the second branch, and the other end of the third branch is communicated with the deceleration chamber.

6. The motor drive assembly according to claim 5, characterized in that: The reducer includes a sun gear and a plurality of planetary gear sets, the sun gear is drivingly connected to the rotor and the plurality of planetary gear sets, the first branch is connected to the planetary gear sets, a first oil outlet is provided on the rotor, and the first oil outlet is connected to the third branch and the sun gear.

7. The motor drive assembly according to claim 5, characterized in that: A second oil outlet hole is provided on the side wall of the rotor. The second oil outlet hole penetrates the rotor in the radial direction of the rotor, and the second oil outlet hole is communicated with the motor cavity.

8. The motor drive assembly according to claim 5, characterized in that: The motor drive assembly also includes an oil pipe, which is arranged at one end of the rotor away from the reducer, the oil pipe is connected to the rotor and the housing, and is provided with a first hole section, a second hole section and a third hole section. The first hole section extends along the axial direction of the oil pipe and is connected to the third branch, the second hole section and the third hole section both extend along the radial direction of the oil pipe and are connected to the first hole section, the second branch is connected to the second hole section, and the third hole section is connected to the second bearing.

9. The motor drive assembly according to claim 8, characterized in that: The oil pipe includes a pipe body and a flange, the first hole section, the second hole section and the third hole section are all arranged on the pipe body, the flange is arranged on the outer peripheral wall of the pipe body and is in contact with the side wall of the outer shell, a positioning block is arranged on the end face of the flange, and a positioning groove cooperating with the positioning block is arranged on the outer shell.

10. The motor drive assembly according to claim 1, characterized in that: Oil rings are provided at both ends of the stator winding, two connecting holes are provided on the outer shell, the two connecting holes correspond to the two oil rings one by one, a first oil inlet hole is provided on the oil ring, and the main oil supply path is connected with the first oil inlet hole through the connecting hole.

11. The motor drive assembly according to claim 1, characterized in that: The lubrication system also includes a main oil return circuit, a first oil return channel and a second oil return channel. The main oil return circuit, the first oil return channel and the second oil return channel are all arranged in the outer shell. The main oil return circuit is arranged adjacent to the lower end of the stator winding, and the main oil supply circuit is arranged adjacent to the upper end of the stator winding. The first oil return channel is connected to the motor cavity and the main oil return circuit, and the second oil return channel is connected to the deceleration cavity and the main oil return circuit.

12. The motor drive assembly according to claim 11, characterized in that: A baffle extending upward is provided at the bottom of the deceleration chamber, and the baffle divides the deceleration chamber into a deceleration area and an overflow area. The reducer is installed in the deceleration area, and the oil in the deceleration area can overflow upward into the overflow area. The second oil return channel is connected to the overflow area.

13. The motor drive assembly according to claim 12, characterized in that: The baffle plate is provided with an oil return branch hole, which is arranged adjacent to the lower end of the baffle plate and is communicated with the reducer and the overflow area.

14. The motor drive assembly according to any one of claims 1 to 13, characterized in that: The housing includes two symmetrically arranged shell units, each of which is provided with the deceleration chamber and the motor chamber. The drive motor, the reducer and the lubrication system are each in two groups, and the two groups of the drive motor, the reducer and the lubrication system are respectively arranged in the two shell units.

15. The motor drive assembly according to claim 14, characterized in that: A third branch extending along the axial direction is provided in the rotor, and the third branch is connected to the deceleration chamber. The motor drive assembly also includes an oil pipe, and the oil pipe is provided between the two housing units. The oil pipe has two unconnected tube bodies, and the two tube bodies are connected to the two rotors one by one. The main oil supply path is connected to the third branch through the tube body.

16. A vehicle, characterized in that: Comprising the motor drive assembly as described in any one of claims 1-15.

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