Driving system and vehicle

Abstract

The utility model discloses a driving system and a vehicle. The driving system comprises a first oil pool, an oil feeding main path, a shell, a motor and a second oil pool. And the shell is provided with an oil return path which is communicated with the first oil pool. The motor is arranged in the shell. The motor comprises a stator and a rotor. And the second oil pool is communicated with the first oil pool through an oil feeding main path. The second oil pool is provided with a first oil discharge hole and a second oil discharge hole. In the gravity direction, the second oil pool is located above the motor, and the first oil discharge hole is located below the second oil discharge hole. And the first oil discharge hole is communicated with the stator. And the second oil discharge hole is communicated with the rotor. According to the oil quantity of the second oil pool, oil flows out of the first oil discharge hole and the second oil discharge hole at different heights, the heat dissipation requirements of the motor under different working conditions can be met, oil way back pressure cannot be formed, oil way pressure is reduced, and then the efficiency of a driving system is improved.

Description

Technical Field

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

[0002] With the rapid development of new energy vehicles, electric drive as the power core of new energy vehicles has also made rapid progress. Current electric drive technologies all use oil to cool the motor. However, the existing oil cooling system distributes the same amount of cooling oil to the stator and rotor at the same time under the low-speed and high-torque working conditions of the motor, resulting in the stator not being able to be fully cooled by oil. The rotor has no heat dissipation demand, but cooling oil still enters the rotor, resulting in unnecessary efficiency loss due to rotor oil throwing. This method cannot distribute oil according to the heat dissipation requirements of different working conditions of the motor, resulting in oil waste. Utility Model Content

[0003] The present application provides a drive system and a vehicle to solve the technical problem of being unable to distribute oil according to the heat dissipation requirements of different working conditions of the motor.

[0004] To solve the above technical problems, the present application proposes a drive system, comprising: a first oil pool and an oil supply main path; a shell, provided with an oil return path, the oil return path is connected to the first oil pool; a motor, arranged in the shell, the motor comprising a stator and a rotor; a second oil pool, the second oil pool is connected to the first oil pool through the oil supply main path, the second oil pool is provided with a first oil drain hole and a second oil drain hole, along the direction of gravity, the second oil pool is located above the motor, and the first oil drain hole is located below the second oil drain hole; wherein the first oil drain hole is connected to the stator, and the second oil drain hole is connected to the rotor.

[0005] In some embodiments of the present application, the second oil pool is further provided with a third oil drain hole, and along the direction of gravity, the third oil drain hole is located above the second oil drain hole; the third oil drain hole is connected to the oil return circuit or the first oil pool.

[0006] In some embodiments of the present application, the motor also includes a rotating shaft, which is provided with an oil passage and an oil outlet hole connected to the oil passage along the axis; the rotor is mounted on the rotating shaft, and the oil outlet hole passes through the rotating shaft to be connected to the rotor; the oil passage is connected to the second row of oil holes.

[0007] In some embodiments of the present application, a connecting oil circuit is also included, which connects the oil channel and the second oil drain hole, and at least one of the connecting oil circuit and the main oil supply circuit is provided with a control valve.

[0008] In some embodiments of the present application, an oil pump is also included, which is arranged on the main oil delivery line; the motor also includes a rotating shaft, and the rotor is mounted on the rotating shaft; the drive system also includes a transmission system, which is connected to the rotating shaft, and the transmission system includes an output shaft, which is connected to the oil pump.

[0009] In some embodiments of the present application, the main oil supply circuit includes a main oil circuit and a first branch; the main oil circuit is connected to the first oil pool and the first branch, and the first branch is also connected to the second oil pool; the drive system also includes a second branch, which connects the main oil circuit and the rotor, wherein a control valve is provided on at least any one of the first branch and the second branch.

[0010] In some embodiments of the present application, an oil pump is also included, which is arranged in the main oil circuit; the motor also includes a rotating shaft, and the rotor is mounted on the rotating shaft. The rotating shaft is provided with an oil passage and an oil outlet hole connected to the oil passage along the axis line, and the oil outlet hole passes through the rotating shaft to be connected to the rotor; the driving system also includes a transmission system, which is connected to the rotating shaft, and the transmission system includes an output shaft, which is connected to the oil pump; the oil passage is connected to the second branch and the second oil discharge hole.

[0011] In some embodiments of the present application, an anti-oil overflow circuit is also included, which is connected to the main oil circuit and a control valve is also provided on the anti-oil overflow circuit.

[0012] In some embodiments of the present application, the drive system includes an oil filter assembly, which is disposed on the main oil delivery line; the drive system also includes a heat exchanger, which is disposed on the main oil delivery line.

[0013] In order to solve the above technical problems, the present application proposes a vehicle, comprising a drive system in any one of the above embodiments.

[0014] The beneficial effect of the present application is as follows: Different from the prior art, the present application provides a drive system and a vehicle. The drive system includes a first oil pool, an oil supply main path, a housing, a motor and a second oil pool. The housing is provided with an oil return path, which is connected to the first oil pool. The motor is arranged in the housing. The motor includes a stator and a rotor. The second oil pool is connected to the first oil pool through the oil supply main path. The second oil pool is provided with a first oil drain hole and a second oil drain hole. Along the direction of gravity, the second oil pool is located above the motor, and the first oil drain hole is located below the second oil drain hole. Among them, the first oil drain hole is connected to the stator. The second oil drain hole is connected to the rotor. According to the amount of oil in the second oil pool, the oil flows out from the first oil drain hole and the second oil drain hole at different heights. Because in actual applications of the motor, when the rotor is at a low speed, the iron loss is small, the heat generation is small, and there is no need for heat dissipation, so only the stator needs to be cooled. If at this time, the same amount of cooling oil is distributed to the stator and the rotor at the same time, the stator cannot be fully cooled by the oil under the low-speed and high-torque working condition of the motor, and the rotor has no heat dissipation demand, but oil still enters the rotor, thereby causing unnecessary efficiency loss to the rotor oil throwing. In this application, since the first row of oil holes is located below the second oil pool, the oil first flows out from the first row of oil holes to cool the stator first, and the second row of oil holes must wait until the rotor generates a large amount of heat before discharging the oil to cool the rotor. In other words, it is necessary to ensure that the oil always cools the stator, which is consistent with the heating situation of the motor in actual use. On the one hand, the oil always enters the stator to ensure the cooling of the stator; on the other hand, when the rotor does not need to be cooled, no oil enters the rotor, avoiding unnecessary efficiency loss caused by the rotor oil throwing, thereby meeting the heat dissipation requirements of the motor under different working conditions, and will not form oil circuit back pressure, reduce oil circuit pressure, and thus improve the efficiency of the drive system. At the same time, the return oil circuit collects the remaining oil of the motor, realizes oil circulation, and improves the utilization efficiency of the oil. In addition, the first oil drain hole and the second oil drain hole are integrated in the second oil pool to improve system integration, reduce size, weight and cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0016] Figure 1 It is a first structural schematic diagram of an embodiment of the drive system of the present application;

[0017] Figure 2 It is a second structural schematic diagram of an embodiment of the drive system of the present application.

[0018] Figure numbers: 10, first oil pool; 11, main oil supply path; 20, second oil pool; 21, first oil drain hole; 22, second oil drain hole; 221, connecting oil path; 23, third oil drain hole; 30, housing; 40, motor; 41, stator; 42, rotor; 43, rotating shaft; 431, oil passage; 50, oil pump; 60, transmission system; 61, output shaft; 70, control valve; 71, overflow valve; 80, oil filter assembly; 81, coarse oil filter; 82, fine oil filter; 90, heat exchanger; 110 main oil path; 111, first branch; 112, second branch; 113, anti-overflow oil path. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0020] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0021] The drive system and vehicle provided by the utility model are described in detail below in conjunction with the embodiments.

[0022] See also Figure 1 , Figure 1 1 is a first structural schematic diagram of an embodiment of a drive system of the present application. In one aspect of the present application, a drive system is provided. In one embodiment, the drive system includes: a first oil pool 10, an oil supply main path 11, a housing 30, a motor 40 and a second oil pool 20.

[0023] The first oil pool 10 is used to store oil. The oil has the function of cooling or lubricating. The main oil supply path 11 is a path for the oil to circulate. The main oil supply path 11 is used to transport the oil in the first oil pool 10.

[0024] The housing 30 is provided with an oil return circuit (not shown). The oil return circuit is a path for oil to flow. The oil return circuit is connected to the first oil pool 10. The remaining oil after cooling the motor 40 flows into the first oil pool 10 through the oil return circuit, thereby realizing oil circulation and improving the utilization efficiency of the oil.

[0025] The motor 40 is disposed in the housing 30. Oil flows into the motor 40 to cool or lubricate the motor 40. The motor 40 includes a stator 41 and a rotor 42. The stator 41 is located at the outer ring of the motor 40, and the rotor 42 is located at the inner ring of the motor 40.

[0026] The second oil pool 20 is used to store oil. The second oil pool 20 is connected to the first oil pool 10 through the main oil supply path 11. The oil in the first oil pool 10 enters the second oil pool 20 through the main oil supply path 11 to ensure that the amount of oil in the second oil pool 20 is sufficient. The second oil pool 20 is provided with a first oil drain hole 21 and a second oil drain hole 22. Along the gravity direction, the second oil pool 20 is located above the motor 40, and the first oil drain hole 21 is located below the second oil drain hole 22. The first oil drain hole 21 is close to the bottom of the second oil pool 20. When the oil level in the second oil pool 20 rises to the first oil drain hole 21, the oil flows out from the first oil drain hole 21. When the oil level in the second oil pool 20 rises to the second oil drain hole 22, the oil flows out from the second oil drain hole 22, and the oil also flows out from the first oil drain hole 21. The oil in the second oil pool 20 flows into the motor 40 through the first oil drain hole 21 and the second oil drain hole 22, and the oil cools different parts of the motor 40. The first oil drain hole 21 and the second oil drain hole 22 having different heights form a time difference between the time when the oil flows out of the first oil drain hole 21 and the time when the oil flows out of the second oil drain hole 22, so that the oil can flow out from the first oil drain hole 21 and the second oil drain hole 22 of the second oil pool 20 in different time periods.

[0027] In a specific implementation, the height difference between the first oil drain hole 21 and the second oil drain hole 22 can be set according to the heating time of the rotor 42 of the motor 40 .

[0028] The first oil drain hole 21 is in communication with the stator 41. The oil in the second oil pool 20 flows into the stator 41 through the first oil drain hole 21, and the oil cools the stator 41.

[0029] The second oil drain hole 22 is in communication with the rotor 42. The oil in the second oil pool 20 flows into the rotor 42 through the second oil drain hole 22, and the oil cools the rotor 42.

[0030] The oil in the first oil pool 10 flows into the second oil pool 20 through the main oil delivery path 11. When the oil level in the second oil pool 20 rises to the first oil drain hole 21, the oil flows into the stator 41 through the first oil drain hole 21 to cool the stator 41. The oil level in the second oil pool 20 continues to rise. When the oil level rises to the second oil drain hole 22, the oil flows into the rotor 42 through the second oil drain hole 22. At the same time, the oil flows into the stator 41 through the first oil drain hole 21, so that the oil cools the stator 41 and the rotor 42 at the same time. After cooling the motor 40, the remaining oil flows into the first oil pool 10 through the oil return path.

[0031] Through the above-mentioned method, according to the amount of oil in the second oil pool 20, the oil flows out from the first oil row hole 21 and the second oil row hole 22 at different heights. Since in actual application of the motor 40, the rotor 42 has a small iron loss and a small heat generation when the motor 40 is at a low speed, and there is no need for heat dissipation, so only the stator 41 needs to be cooled. If at this time, the same amount of cooling oil is allocated to the stator 41 and the rotor 42 at the same time, the stator 41 cannot be fully cooled by the oil under the low-speed and high-torque working condition of the motor 40, and the rotor 42 has no need for heat dissipation, but oil still enters the rotor 42, thereby causing unnecessary efficiency loss to the rotor 42 oil throwing. In the present application, since the first oil row hole 21 is located below the second oil pool 20, the oil first flows out from the first oil row hole 21 to cool the stator 41 first, and the second oil row hole 22 must wait until the rotor 42 generates a large amount of heat before discharging the oil to cool the rotor 42. In other words, it is necessary to ensure that the oil cools the stator 41 all the time, which is consistent with the heating situation of the motor 40 during actual use. On the one hand, the oil always enters the stator 41 to ensure the cooling of the stator 41; on the other hand, when the rotor 42 does not need to be cooled, no oil enters the rotor 42, avoiding unnecessary efficiency loss caused by the rotor 42 throwing oil, thereby meeting the heat dissipation requirements of the motor 40 under different working conditions, and will not form oil circuit back pressure, reduce oil circuit pressure, and thus improve the efficiency of the drive system. At the same time, the return oil circuit collects the remaining oil of the motor 40 to realize oil circulation and improve the utilization efficiency of the oil. In addition, the first oil drain hole 21 and the second oil drain hole 22 are simultaneously integrated in the second oil pool 20 to improve system integration, reduce size, reduce weight, and reduce cost.

[0032] Along the gravity direction, the positions of the first oil drain hole 21 and the second oil drain hole 22 in the second oil pool 20 can be set according to actual conditions, and are not limited here. For example, in one specific embodiment, the first oil drain hole 21 is provided on the bottom wall of the second oil pool 20, and along the gravity direction, the first oil drain hole 21 is located above the stator 41, and the oil in the second oil pool 20 directly drips onto the stator 41 due to gravity, thereby cooling the stator 41. The second oil drain hole 22 is provided on the side wall of the second oil pool 20, and the oil in the second oil pool 20 flows into the rotor 42 through the second oil drain hole 22, thereby cooling the rotor 42. In another specific embodiment, along the gravity direction, the first oil drain hole 21 and the second oil drain hole 22 are both provided on the side wall of the second oil pool 20, and the first oil drain hole 21 is located below the second oil drain hole 22.

[0033] The positional relationship between the first oil pool 10, the second oil pool 20 and the housing 30 can be set according to actual conditions, and is not limited here. In one specific embodiment, the first oil pool 10, the second oil pool 20 and the housing 30 are independent of each other. The first oil pool 10 and the second oil pool 20 are independently arranged outside the housing 30. The first oil pool 10 and the second oil pool 20 are independently arranged inside the housing 30. The first oil pool 10 may be arranged at the bottom of the housing 30, and the second oil pool 20 may be arranged at the top of the housing 30. The first oil pool 10 and the second oil pool 20 are connected to the housing 30 through a pipeline or installation method. In another specific embodiment, the first oil pool 10 and the second oil pool 20 are integrated with the housing 30. In another specific embodiment, the first oil pool 10 is independent of the housing 30, and the second oil pool 20 is integrated with the housing 30. Or the second oil pool 20 is independent of the housing 30, and the first oil pool 10 is integrated with the housing 30.

[0034] The positional relationship between the main oil supply path 11, the oil return path and the housing 30 can be set according to actual conditions, and is not limited here. In one specific embodiment, the main oil supply path 11, the oil return path and the housing 30 are integrated. In another specific embodiment, the main oil supply path 11, the oil return path and the housing 30 are separately set. The main oil supply path 11 and the oil return path can be independently set inside the housing 30. The main oil supply path 11 and the oil return path can also be independently set outside the housing 30.

[0035] In one embodiment, the second oil pool 20 is further provided with a third oil drain hole 23. When the oil level in the second oil pool 20 rises to the third oil drain hole 23, the oil in the second oil pool 20 flows out through the third oil drain hole 23. Along the gravity direction, the third oil drain hole 23 is located above the second oil drain hole 22. The first oil drain hole 21 is close to the bottom of the second oil pool 20. The third oil drain hole 23 is close to the top of the second oil pool 20. The second oil drain hole 22 is located between the first oil drain hole 21 and the third oil drain hole 23.

[0036] When the oil level of the second oil pool 20 rises to the third oil drain hole 23, the oil flows into the stator 41 through the first oil drain hole 21, and flows into the rotor 42 through the second oil drain hole 22. When the oil level of the second oil pool 20 rises to the third oil drain hole 23, the oil flows out from the first oil drain hole 21, the second oil drain hole 22 and the third oil drain hole 23 simultaneously.

[0037] The third oil drain hole 23 is connected to the oil return oil circuit or the first oil pool 10. In one specific embodiment, the third oil drain hole 23 is connected to the oil return oil circuit. The oil in the second oil pool 20 flows into the oil return oil circuit through the third oil drain hole 23, and the remaining oil of the motor 40 flows into the first oil pool 10 through the oil return oil circuit together with the oil in the second oil pool 20. In another specific embodiment, the third oil drain hole 23 is connected to the first oil pool 10, and the oil in the second oil pool 20 flows directly into the first oil pool 10 through the third oil drain hole 23. The third oil drain hole 23 and the first oil pool 10 can be connected through a pipeline, and the oil at the third oil drain hole 23 flows into the first oil pool 10 through the pipeline.

[0038] When the oil intake of the second oil pool 20 exceeds the oil volume of the cooling motor 40, the oil flows out from the third oil drain hole 23, which can reduce the possibility of oil overflowing the second oil pool 20 and reduce the oil storage pressure of the second oil pool 20. The third oil drain hole 23 is connected with the oil return oil circuit or the first oil pool 10, which can realize oil circulation, improve the utilization rate of the oil, and improve the working efficiency of the drive system. At the same time, along the gravity direction, the first oil drain hole 21, the second oil drain hole 22 and the third oil drain hole 23 of different heights are set on the second oil pool 20, which can improve the system integration, reduce the size, reduce the weight and reduce the cost.

[0039] In one embodiment, the motor 40 further includes a rotating shaft 43. The rotating shaft 43 is provided with an oil passage 431 and an oil outlet hole (not shown) connected to the oil passage 431 along the axis. The oil passage 431 is a cavity along the axis inside the rotating shaft 43. The oil outlet hole is provided on the surface of the rotating shaft 43. The rotor 42 is sleeved on the rotating shaft 43, and the oil outlet hole penetrates the rotating shaft 43 until it is connected to the rotor 42. The oil passage 431 is connected to the second oil discharge hole 22.

[0040] When the rotor 42 is at a medium or high speed and generates a large amount of heat, the oil flows into the oil passage 431 through the second oil row hole 22 to cool the shaft 43. At the same time, as the shaft 43 rotates at a high speed, the oil in the oil passage 431 enters the rotor 42 from the oil outlet hole, and the oil in the rotor 42 enters the stator 41 as the shaft 43 rotates, thereby cooling the rotor 42 and the stator 41.

[0041] By providing an oil passage 431 and an oil outlet hole connected to the oil passage 431 on the rotating shaft 43, the rotor 42 and the stator 41 can be cooled at the same time, thereby improving the efficiency of the driving system.

[0042] In one embodiment, the drive system further includes a connecting oil circuit 221. The connecting oil circuit 221 connects the oil passage 431 and the second oil drain hole 22. When the oil level of the second oil pool 20 rises to the second oil drain hole 22, the oil flows from the second oil drain hole 22 into the connecting oil circuit 221, and then flows into the oil passage 431 through the connecting oil circuit 221, so as to cool down the rotor 42 and the stator 41.

[0043] At least one of the oil passages 221 and the main oil delivery passage is provided with a control valve 70. The types of the control valve 70 include but are not limited to a water valve, a solenoid valve, a manual valve, etc. The control valve 70 can independently control the on-off of a single oil passage or multiple oil passages, reduce the oil passage pressure, and improve the utilization efficiency of the oil.

[0044] In a specific embodiment, the control valve 70 is disposed on the oil communication path 221. The control valve 70 independently controls the oil conduction or blocking of the oil communication path 221.

[0045] In another specific embodiment, the control valve 70 is disposed on the main oil supply path 11. The control valve 70 independently controls the oil flow in the main oil supply path 11 to be connected or blocked.

[0046] In another specific embodiment, two control valves 70 are respectively arranged on the connecting oil path 221 and the main oil delivery path 11. The two control valves 70 can respectively control the conduction or blocking of the oil in the connecting oil path 221 and the oil in the main oil delivery path 11. The two control valves 70 can also simultaneously control the conduction or blocking of the oil in the connecting oil path 221 and the oil in the main oil delivery path 11.

[0047] In one embodiment, the drive system further includes an oil pump 50. The oil pump 50 is disposed on the main oil delivery path 11. The oil pump 50 is used to suck the oil in the first oil pool 10 into the main oil delivery path 11 and deliver the oil to the second oil pool 20. The oil pump 50 includes but is not limited to an electronic oil pump 50, a mechanical oil pump 50, etc.

[0048] The motor 40 further includes a rotating shaft 43. The rotor 42 is mounted on the rotating shaft 43. The drive system further includes a transmission system 60. The transmission system 60 is in transmission connection with the rotating shaft 43. The rotating shaft 43 rotates to transmit power to the transmission system 60. The transmission system 60 includes an output shaft 61, and the output shaft 61 is connected to the oil pump 50. The rotation of the rotating shaft 43 drives the output shaft 61 to rotate, and the output shaft 61 transmits power to the oil pump 50, and the oil pump 50 sucks the oil in the first oil pool 10 into the main oil supply path 11. In other words, the rotation speed of the motor 40 is directly proportional to the rotation speed of the oil pump 50, and the faster the rotation speed of the motor 40, the faster the rotation speed of the oil pump 50.

[0049] The low-speed rotation of the rotating shaft 43 drives the oil pump 50 to rotate at a low speed, and all the oil in the second oil pool 20 flows into the stator 41 through the first oil drain hole 21 to cool the stator 41. The increase in the speed of the rotating shaft 43 drives the speed of the oil pump 50 to increase, and the oil level in the second oil pool 20 rises. When the oil reaches the second oil drain hole 22, the oil flows into the rotor 42 from the second oil drain hole 22, and at the same time, the oil flows into the stator 41 through the first oil drain hole 21, so that the oil cools the stator 41 and the rotor 42 at the same time. The increase in the speed of the rotating shaft 43 drives the speed of the oil pump 50 to continue to increase, and the oil level in the second oil pool 20 continues to rise. The oil reaches the third oil drain hole 23, and while the oil cools the stator 41 and the rotor 42, the oil flows into the first oil pool 10 from the third oil drain hole 23. This arrangement can reduce the efficiency loss of the rotor 42 throwing oil at low speed when the motor 40 is at low speed, and meet the iron loss heating and cooling requirements of the rotor 42 at medium and high speeds of the motor 40. At the same time, no oil circuit back pressure will be formed at the highest speed of the motor 40, causing additional power loss of the oil pump 50, thereby improving the efficiency of the drive system.

[0050] In this embodiment, the oil pump 50 is a mechanical oil pump 50. The mechanical oil pump 50 is a purely mechanical structure, has few parts, a simple structure, low cost, and a small size, can be completely built into the drive system, has no risk of oil leakage, and takes power from the rotating shaft 43 of the motor 40, does not have a low-temperature starting problem, and has high overall reliability.

[0051] In another embodiment, the oil pump 50 is an electronic pump. The speed of the oil pump 50 is controlled by software, so as to further improve the control capability of the oil flow rate on the main oil delivery path 11 and improve the system efficiency.

[0052] In a specific embodiment, one end of the output shaft 61 is connected to the rotating shaft 43, and the other end of the output shaft 61 is meshed with the power gear of the oil pump 50. The rotation of the rotating shaft 43 drives the output shaft 61 and the power gear of the oil pump 50 to rotate, and transmits power to the oil pump 50, and the oil pump 50 sucks oil from the first oil pool 10.

[0053] In one embodiment, the drive system includes an oil filter assembly 80. The oil filter assembly 80 is disposed on the main oil supply path 11. The oil filter assembly 80 is used to filter impurities in the oil. The oil on the main oil supply path 11 passes through the oil filter assembly 80, and the oil filter assembly 80 filters impurities in the oil. The filtered oil enters the second oil pool 20 through the main oil supply path 11, thereby reducing the possibility that impurities in the oil may damage the motor 40.

[0054] In a specific embodiment, the oil filter assembly 80 includes a coarse oil filter 81 and a fine oil filter 82. The coarse oil filter 81 is disposed on the main oil supply path 11 near the first oil pool 10 to filter large particles of impurities in the oil. The fine oil filter 82 is disposed on the main oil supply path 11 near the second oil pool 20 to filter small particles of impurities in the oil.

[0055] In one embodiment, the drive system includes a heat exchanger 90. The heat exchanger 90 is disposed on the main oil supply path 11 and is used to cool the oil. The heat exchanger 90 is disposed at a position of the main oil supply path 11 close to the second oil pool 20. The oil on the main oil supply path 11 passes through the heat exchanger 90, and the heat exchanger 90 cools the oil, and the cooled oil enters the second oil pool 20 through the main oil supply path 11.

[0056] The rotation of the rotating shaft 43 of the motor 40 drives the output shaft 61 to rotate, thereby the oil pump 50 rotates, the oil pump 50 sucks oil from the first oil pool 10, the oil in the main oil delivery path 11 passes through the coarse oil filter 81, the coarse oil filter 81 filters the large particles of impurities in the oil, the oil is output by the oil pump 50, the oil passes through the fine oil filter 82, the fine oil filter 82 filters the small particles of impurities in the oil, the oil enters the heat exchanger 90 through the main oil delivery path 11, the heat exchanger 90 cools the oil, and the cooled oil enters the second oil pool 20 through the oil delivery pipeline.

[0057] See also Figure 2 , Figure 2 It is a second structural schematic diagram of an embodiment of the drive system of the present application. In one embodiment, the main oil supply circuit 11 includes a main oil circuit 110 and a first branch circuit 111. The main oil circuit 110 and the first branch circuit 111 are paths for oil circulation. The main oil circuit 110 is used to transport the oil in the first oil pool 10. The main oil circuit 110 is connected to the first oil pool 10 and the first branch circuit 111. The oil in the first oil pool 10 enters the first branch circuit 111 through the main oil circuit 110. The first branch circuit 111 is also connected to the second oil pool 20. The oil in the main oil circuit 110 flows into the second oil pool 20 through the first branch circuit 111. The oil in the second oil pool 20 flows into the stator 41 through the first oil drain hole 21, and the oil cools the stator 41. When the oil level of the second oil pool 20 rises to the second oil drain hole 22, the oil flows into the rotor 42 through the second oil drain hole 22, and the oil cools the rotor 42. When the oil level of the second oil pool 20 rises to the third oil drain hole 23 , the oil flows into the first oil pool 10 through the third oil drain hole 23 .

[0058] The drive system further includes a second branch 112. The second branch 112 is a path for oil circulation. The second branch 112 connects the main oil circuit 110 and the rotor 42. The oil in the main oil circuit 110 flows into the rotor 42 through the second branch 112, and the oil cools the rotor 42.

[0059] The end of the main oil circuit 110 close to the first oil pool 10 is used to transport the oil in the first oil pool 10, and the end of the main oil circuit 110 away from the first oil pool 10 is respectively connected to the first branch 111 and the second branch 112. The first branch 111 is used to supply oil to the second oil pool 20, and the second branch 112 is used to supply oil to the rotor 42.

[0060] When the rotor 42 rotates at a low speed and generates less heat, the oil in the main oil circuit 110 flows from the first branch 111 into the second oil pool 20, and then flows out from the first oil drain hole 21 to cool the stator 41 first. When the rotor 42 rotates at a high speed and generates more heat, the oil flows from the second oil drain hole 22 into the rotor 42, and at the same time, the oil in the main oil circuit 110 flows from the second branch 112 into the rotor 42, thereby cooling the rotor 42. By providing the first branch 111 and the second branch 112, the flow direction of the oil can be regulated respectively, the oil circuit pressure can be relieved, and the utilization rate of the oil can be improved.

[0061] A control valve 70 is provided on at least one of the first branch 111 and the second branch 112. The types of the control valve 70 include but are not limited to a water valve, a solenoid valve, a manual valve, etc. The control valve 70 can independently control the on-off of a single oil circuit or multiple oil circuits, reduce the oil circuit pressure, and improve the utilization efficiency of the oil.

[0062] In one specific embodiment, the control valve 70 is disposed on the first branch 111. The control valve 70 independently controls the conduction or blocking of the oil in the first branch 111. In another specific embodiment, the control valve 70 is disposed on the second branch 112. The control valve 70 independently controls the conduction or blocking of the oil in the second branch 112. In another specific embodiment, two control valves 70 are respectively disposed on the first branch 111 and the second branch 112. The two control valves 70 can control the conduction or blocking of the oil in the first branch 111 and the oil in the second branch 112, respectively. The two control valves 70 can also conduct or block the oil in the first branch 111 and the oil in the second branch 112 at the same time.

[0063] In one embodiment, the drive system further includes an oil pump 50. The oil pump 50 is disposed on the main oil circuit 110. The oil pump 50 is used to suck the oil in the first oil pool 10 into the main oil circuit 110. The oil pump 50 includes but is not limited to an electronic oil pump 50, a mechanical oil pump 50, and the like.

[0064] The motor 40 further includes a rotating shaft 43, and the rotor 42 is sleeved on the rotating shaft 43. The rotating shaft 43 is provided with an oil passage 431 and an oil outlet hole (not shown) connected to the oil passage 431 along the axis. The oil passage 431 is a cavity along the axis inside the rotating shaft 43. The oil outlet hole is provided on the surface of the rotating shaft 43. The rotor 42 is sleeved on the rotating shaft 43, and the oil outlet hole penetrates the rotating shaft 43 until it is connected to the rotor 42. The oil passage 431 is connected to both the second branch 112 and the second oil drain hole 22.

[0065] When the rotor 42 is at a medium or high speed and generates a large amount of heat, the oil flows into the oil passage 431 through the second oil discharge hole 22, and the oil in the main oil circuit 110 flows into the oil passage 431 through the second branch 112 to cool the shaft 43. As the shaft 43 rotates at a high speed, the oil in the oil passage 431 enters the rotor 42 from the oil outlet hole, and the oil in the rotor 42 enters the stator 41 as the shaft 43 rotates, thereby cooling the rotor 42 and the stator 41.

[0066] By providing an oil passage 431 and an oil outlet hole connected to the oil passage 431 on the rotating shaft 43, the rotor 42 and the stator 41 can be cooled at the same time, thereby improving the efficiency of the driving system.

[0067] The drive system further includes a transmission system 60. The transmission system 60 is in transmission connection with the rotating shaft 43. The rotating shaft 43 rotates to transmit power to the transmission system 60. The transmission system 60 includes an output shaft 61, and the output shaft 61 is connected to the oil pump 50. The rotating shaft 43 rotates to drive the output shaft 61 to rotate, and the output shaft 61 transmits power to the oil pump 50, and the oil pump 50 sucks the oil in the first oil pool 10 into the main oil circuit 110.

[0068] When the oil pump 50 rotates at a low speed, the oil flows into the first branch 111 through the main oil circuit 110, and then flows into the second oil pool 20 through the first branch 111. The oil in the second oil pool 20 flows into the stator 41 through the first oil drain hole 21 to cool the stator 41. As the speed of the oil pump 50 increases, the oil level in the second oil pool 20 rises. When the oil reaches the second oil drain hole 22, the oil flows into the rotor 42 from the second oil drain hole 22. At the same time, the oil also flows from the main oil circuit 110 into the second branch 112. The oil in the second branch 112 flows into the rotor 42, so that the oil cools the stator 41 and the rotor 42 at the same time. The speed of the oil pump 50 continues to increase, and the oil level in the second oil pool 20 continues to rise. The oil reaches the third oil drain hole 23. While the oil cools the stator 41 and the rotor 42, the oil flows into the first oil pool 10 from the third oil drain hole 23. This arrangement can reduce the efficiency loss of the rotor 42 throwing oil at low speed when the motor 40 is at low speed, and meet the iron loss heating and cooling requirements of the rotor 42 at medium and high speeds of the motor 40. At the same time, no oil circuit back pressure will be formed at the highest speed of the motor 40, causing additional power loss of the oil pump 50, thereby improving the efficiency of the drive system.

[0069] In this embodiment, the oil pump 50 is a mechanical oil pump 50. The mechanical oil pump 50 is a purely mechanical structure, has few parts, a simple structure, low cost, and a small size, can be completely built into the drive system, has no risk of oil leakage, and takes power from the rotating shaft 43 of the motor 40, does not have a low-temperature starting problem, and has high overall reliability.

[0070] In another embodiment, the oil pump 50 is an electronic pump. The speed of the oil pump 50 is controlled by software, so as to further improve the control capability of the oil flow in the main oil circuit 110 and improve the system efficiency.

[0071] In a specific embodiment, one end of the output shaft 61 is connected to the rotating shaft 43, and the other end of the output shaft 61 is meshed with the power gear of the oil pump 50. The rotation of the rotating shaft 43 drives the output shaft 61 and the power gear of the oil pump 50 to rotate, and transmits power to the oil pump 50, and the oil pump 50 sucks oil from the first oil pool 10.

[0072] In one embodiment, the drive system further includes an anti-overflow oil circuit 113. One end of the anti-overflow oil circuit 113 is connected to the main oil circuit 110. The other end of the anti-overflow oil circuit can be connected to the first oil pool 10 or the return oil circuit. When the pressure of the main oil circuit 110 is too high, the oil in the main oil circuit 110 flows to the first oil pool 10 through the anti-overflow oil circuit 113 to reduce the pressure of the oil circuit.

[0073] In a specific embodiment, the end of the main oil circuit 110 close to the first oil pool 10 is used to transport the oil in the first oil pool 10, and the end of the main oil circuit 110 away from the first oil pool 10 is divided into three, namely the first branch 111, the second branch 112 and the anti-overflow oil circuit 113. The first branch 111 is used to supply oil to the second oil pool 20, the second branch 112 is used to supply oil to the rotor 42, and the anti-overflow oil circuit 113 is used to prevent oil from overflowing. The positional relationship between the first branch 111, the second branch 112 and the anti-overflow oil circuit 113 can be set according to actual conditions and is not limited here.

[0074] The anti-overflow oil circuit 113 is also provided with a control valve 70. When the pressure of the main oil circuit 110 is too high, the control valve 70 opens, and the oil enters the anti-overflow oil circuit 113 from the main oil circuit 110; when the pressure of the main oil circuit 110 is normal, the control valve 70 closes, and the oil enters the first branch 111 or the second branch 112 from the main oil circuit 110. The control valve 70 can independently control the on-off of the anti-overflow oil circuit 113, reduce the oil circuit pressure, and improve the utilization efficiency of the oil. The types of control valves 70 include but are not limited to water valves, solenoid valves, manual valves, etc.

[0075] In another embodiment, the driving system further includes a relief valve 71. The relief valve 71 is disposed at the outlet of the oil pump 50. When the oil circuit load is too large, the relief valve 71 opens to quickly release pressure, thereby reducing the load of the oil pump 50 and improving system efficiency.

[0076] Another aspect of the present application provides a vehicle. The vehicle includes the drive system in the above embodiment. When the vehicle is in a low-speed operating condition, all the oil in the second oil pool 20 flows into the stator 41 through the first oil drain hole 21, and the oil cools the stator 41. When the vehicle is in a medium-high speed, the oil level of the second oil pool 20 continues to rise. When the oil in the second oil pool 20 rises to the second oil drain hole 22, while the oil cools the stator 41, the oil at the second oil drain hole 22 flows into the rotor 42 through the second oil drain hole 22, and the oil cools the stator 41 and the rotor 42 at the same time. When the vehicle is at a high speed, the oil in the second oil pool 20 rises to the highest point of the second oil pool 20. When the oil in the second oil pool 20 rises to the third oil drain hole 23, while the oil cools the stator 41 and the rotor 42, the oil at the third oil drain hole 23 enters the first oil pool 10 through the third oil drain hole 23. The oil after cooling the motor 40 enters the first oil pool 10 through the oil return oil path. This arrangement can reduce the efficiency loss of the rotor 42 when the vehicle is at low speed and the heat generation and cooling requirements of the rotor 42 when the vehicle is at medium and high speeds. At the same time, no oil circuit back pressure will be formed at the highest speed of the vehicle, causing additional power loss of the oil pump 50, thereby improving the efficiency of the vehicle.

[0077] The terms "first", "second", "third" in this application are only used for descriptive purposes and cannot be understood as indicating the quantity of the indicated technical features. Thus, the features defined as "first", "second", "third" can expressly or implicitly include at least one of these features. In the embodiments of the present application, all directional indications (such as up, down, left, right, front, back ...) are only used to explain the relative positional relationship, motion conditions, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication also changes accordingly. In addition, the terms "include" and "have" and any of their variations are intended to cover non-exclusive inclusions. The process, method, system, product or equipment such as including a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or equipment.

[0078] The above descriptions are merely embodiments of the present application and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A drive system, It is characterized in that include: The first oil tank and the main oil delivery line; The housing is provided with an oil return passage, the oil return passage being in communication with the first oil pool; A motor is disposed in the housing, and the motor includes a stator and a rotor; a second oil pool, the second oil pool is connected to the first oil pool through the main oil delivery path, the second oil pool is provided with a first oil drain hole and a second oil drain hole, along the gravity direction, the second oil pool is located above the motor, and the first oil drain hole is located below the second oil drain hole; wherein, The first oil drain hole is communicated with the stator, and the second oil drain hole is communicated with the rotor.

2. The drive system according to claim 1, It is characterized in that The second oil pool is further provided with a third oil row hole, and along the gravity direction, the third oil row hole is located above the second oil row hole; The third oil drain hole is communicated with the oil return passage or the first oil pool.

3. The drive system according to claim 1, It is characterized in that The motor further comprises a rotating shaft, wherein the rotating shaft is provided with an oil passage and an oil outlet hole connected to the oil passage along an axis thereof; The rotor is sleeved on the rotating shaft, and the oil outlet hole passes through the rotating shaft to communicate with the rotor; The oil passage is communicated with the second oil drain hole.

4. The drive system according to claim 3, It is characterized in that It also includes a connecting oil circuit, which connects the oil passage and the second oil drain hole, and at least any one of the connecting oil circuit and the main oil supply circuit is provided with a control valve.

5. The drive system according to any one of claims 1 to 3, It is characterized in that It also includes an oil pump, which is arranged on the main oil delivery line; The motor further comprises a rotating shaft, and the rotor is sleeved on the rotating shaft; The drive system further comprises a transmission system, which is in driving connection with the rotating shaft. The transmission system comprises an output shaft, which is connected to the oil pump.

6. The drive system according to claim 1 or 2, It is characterized in that The main oil supply path includes a main oil path and a first branch path; the main oil path is connected to the first oil pool and the first branch path, and the first branch path is also connected to the second oil pool; The drive system further includes a second branch, the second branch connecting the main oil circuit and the rotor, wherein: A control valve is provided on at least any one of the first branch and the second branch.

7. The drive system according to claim 6, It is characterized in that It also includes an oil pump, which is arranged on the main oil circuit; The motor further comprises a rotating shaft, the rotor is mounted on the rotating shaft, the rotating shaft is provided with an oil passage and an oil outlet hole connected with the oil passage along the axis, the oil outlet hole penetrates the rotating shaft to be connected with the rotor; The drive system further comprises a transmission system, the transmission system is in transmission connection with the rotating shaft, the transmission system comprises an output shaft, and the output shaft is connected to the oil pump; The oil passage is communicated with both the second branch and the second oil drain hole.

8. The drive system according to claim 6, It is characterized in that It also includes an oil overflow prevention circuit, which is connected to the main oil circuit and is also provided with the control valve.

9. The drive system according to claim 1, It is characterized in that The drive system comprises an oil filter assembly, and the oil filter assembly is arranged on the main oil delivery line; The drive system further includes a heat exchanger, which is disposed on the main oil delivery line.

10. A vehicle, It is characterized in that A drive system comprising any one of claims 1 to 9.

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