Oil way cooling system of electric drive system and vehicle comprising oil way cooling system

Abstract

The utility model provides an oil way cooling system of an electric drive system and a vehicle comprising the oil way cooling system. The oil way cooling system of the electric drive system comprises an oil pump, a control valve, a heat exchanger, a one-way valve and a bypass branch. Wherein the oil pump, the control valve, the heat exchanger and the one-way valve are sequentially connected, two ends of the bypass branch are respectively connected to first ends of the control valve and the one-way valve, and the control valve controls the oil pump to communicate with the heat exchanger or the bypass branch; the first end of the one-way valve is connected to a first component of the electric drive system, the second end of the one-way valve is connected to a second component of the electric drive system, the one-way valve is cut off when lubricating oil flows from the first end of the one-way valve to the second end of the one-way valve, and the one-way valve is conducted when the lubricating oil flows from the second end of the one-way valve to the first end of the one-way valve. According to the oil way cooling system, the path of lubricating oil can be reasonably controlled according to the running working condition of the vehicle, so that the energy consumption of the vehicle can be effectively reduced while the cooling effect is guaranteed, and the cruising ability of the vehicle is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the vehicle thermal management technical field, concretely relates to an oil circuit cooling system of electric drive system and vehicle including it. BACKGROUND

[0002] The oil circuit cooling system adopts lubricating oil to cool the motor, bearing, pinion shaft and other components of the electric drive system, in the prior art, the lubricating oil must pass through the heat exchanger in the circulating oil circuit, but when the lubricating oil is at low temperature, the viscosity of the lubricating oil is high, the oil pump is difficult to start, and the energy consumption of the oil pump is large, in addition, when the coolant temperature of the vehicle is not high, the power requirement of the vehicle is not high, the oil temperature in the circulating oil circuit will be lowered by the coolant, and the viscosity of the lubricating oil changes in inverse proportion to the oil temperature, and the oil temperature of the lubricating oil is too low, which will cause the viscosity to be too large, thereby reducing the operating efficiency of the electric drive assembly, furthermore, when the vehicle is in a light load working condition, the motor rotor generates little heat, and at this time, lubricating oil cooling of the rotor will increase the oil throwing loss of the rotor and reduce the endurance of the vehicle. SUMMARY

[0003] The utility model provides an oil circuit cooling system of electric drive system and vehicle including it, make the oil circuit cooling system can according to the operating condition of vehicle reasonable control lubricating oil's path, to guarantee the cooling effect at the same time, can effectively lower the energy consumption of vehicle, improve the endurance of vehicle.

[0004] In order to solve or improve the above technical problems to some extent, according to the utility model provides an oil circuit cooling system of electric drive system, it is characterized by, including: oil pump, control valve, heat exchanger, check valve and bypass branch line;

[0005] Among them, the oil pump, the control valve, the heat exchanger and the check valve are connected in sequence, two ends of the bypass branch line are connected to the control valve and the first end of the check valve respectively, and the control valve controls the oil pump to communicate with the heat exchanger or the bypass branch line;

[0006] The first end of the check valve is connected to the first component of the electric drive system, and the second end of the check valve is connected to the second component of the electric drive system, when the lubricating oil flows from the first end of the check valve to the second end of the check valve, the check valve is cut off, and when the lubricating oil flows from the second end of the check valve to the first end of the check valve, the check valve is conducted.

[0007] In some embodiments, the first component includes the motor stator, pinion shaft and bearing of the electric drive system, and the second component includes the motor rotor of the electric drive system.

[0008] In some embodiments, the check valve includes a valve body, a first valve core and a first elastic member.

[0009] The valve body is provided with a first oil inlet and a first oil outlet in communication, and the cross-sectional area of the first oil inlet is smaller than that of the first oil outlet.

[0010] The first valve core is arranged in the valve body, and the cross-sectional area of the first end of the first valve core towards the first oil inlet is smaller than that of the second end of the first valve core towards the first oil outlet.

[0011] The first elastic member abuts against the second end of the first valve core to apply a pushing force to the first valve core towards the first oil outlet.

[0012] In some embodiments, the control valve is a two-position three-way electromagnetic valve.

[0013] In some embodiments, the control valve comprises a valve sleeve, a second valve core, an iron core, a sliding sleeve, a coil and a second elastic member.

[0014] The valve sleeve is provided with a second oil inlet, a second oil outlet and a third oil outlet in communication with the inner cavity of the valve sleeve, the second valve core is arranged in the inner cavity of the valve sleeve, the iron core is connected to one end of the second valve core, the sliding sleeve is sleeved outside the iron core, the coil is sleeved outside the sliding sleeve, and the two ends of the second elastic member are respectively connected to the other end of the second valve core and the valve sleeve.

[0015] When the coil is not energized, the second valve core is in a first position under the action of the second elastic member, the second oil inlet and the second oil outlet are in communication, the control valve communicates the oil pump with the heat exchanger, and after the coil is energized, the sliding sleeve drives the iron core to move, so that the second valve core is in a second position, the second oil inlet and the third oil outlet are in communication, and the control valve communicates the oil pump with the bypass branch.

[0016] In some embodiments, a plurality of cooling oil paths are provided, and the plurality of cooling oil paths are respectively connected to the motor rotor, the motor stator, the bearing and the gear shaft, and the cross-sectional areas of at least part of the cooling oil paths are different.

[0017] In some embodiments, a first filtering device is connected to the oil inlet end of the oil pump to filter out particulate matters in the lubricating oil.

[0018] In some embodiments, the first filtering device is arranged on the oil pump to be integrated with the oil pump.

[0019] In some embodiments, a second filtering device is arranged between the oil pump and the control valve to filter out particulate matters in the lubricating oil.

[0020] According to another aspect of the present application, there is provided a vehicle comprising the oil cooling system of the electric drive system according to any one of the above embodiments.

[0021] The oil cooling system of the electric drive system of the present application adds a bypass branch parallel to the heat exchanger, and controls the flow of lubricating oil through the heat exchanger or the bypass branch through the control valve, so that the oil cooling system can select different lubricating oil flow paths according to different working conditions, accurately control the temperature of the lubricating oil under different working conditions, reduce the load of the oil pump, improve the reliability and service life of the oil pump, and effectively improve the operation efficiency of the electric drive system and the endurance of the vehicle. When the lubricating oil flows through the bypass branch, the one-way valve cuts off the path of the lubricating oil flowing through the motor rotor of the electric drive system, avoids the occurrence of oil throwing phenomenon of the motor rotor when the lubricating oil temperature is relatively low, reduces the rotor loss, and further reduces the energy consumption of the vehicle and improves the endurance of the vehicle.

[0022] The above description is only a summary of the technical scheme of the present application, in order to more clearly understand the technical means of the present application, the content of the specification can be implemented, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following preferred embodiments are described in detail, and the accompanying drawings are as follows. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a schematic block diagram of the oil cooling system of the electric drive system of an embodiment of the present application;

[0024] Figure 2 is a cross-sectional structure schematic diagram of the control valve of another embodiment of the present application;

[0025] Figure 3 is a cross-sectional structure schematic diagram of the one-way valve of another embodiment of the present application.

[0026] SYMBOL DESCRIPTION

[0027] 10, oil pump

[0028] 20, control valve

[0029] 200, valve sleeve

[0030] 201, second valve core

[0031] 202, iron core

[0032] 203, sliding sleeve

[0033] 204, coil

[0034] 205, second elastic member

[0035] 206, second oil inlet

[0036] 207、second oil outlet

[0037] 208、third oil outlet

[0038] 30、heat exchanger

[0039] 40、one-way valve

[0040] 400、valve body

[0041] 401、first valve core

[0042] 402、first elastic member

[0043] 403、first oil inlet

[0044] 404、first oil outlet

[0045] 50、bypass branch

[0046] 60、lubricating oil pool

[0047] 70、first filtering device

[0048] 80、second filtering device

[0049] 90、first component

[0050] 91、stator

[0051] 92、bearing

[0052] 93、pinion shaft

[0053] 100、second component (rotor)

[0054] 110、cooling oil circuit DETAILED DESCRIPTION

[0055] To further illustrate the technical means and effects taken by the utility model to achieve the predetermined utility model purposes, the specific embodiments and effects of an oil circuit cooling system of an electric drive system and a vehicle including the same according to the utility model are described in detail as follows in combination with the drawings and preferred embodiments.

[0056] According to the embodiment of the utility model, an oil circuit cooling system of an electric drive system is provided, as shown in Figure 1 which includes an oil pump 10, a control valve 20, a heat exchanger 30, a one-way valve 40 and a bypass branch 50.

[0057] As shown in Figure 1As shown, the oil pump 10, the control valve 20, the heat exchanger 30 and the one-way valve 40 are connected in sequence along the flow path of the lubricating oil. The two ends of the bypass branch 50 are connected to the control valve 20 and the first end of the one-way valve 40 respectively, the control valve 20 controls the oil pump 10 to communicate with the heat exchanger 30 or the bypass branch 50, the first end of the one-way valve 40 is used to communicate with the first component 90 of the electric drive system, the second end of the one-way valve 40 is used to communicate with the second component 100 of the electric drive system, the one-way valve 40 is closed when the lubricating oil flows from the first end of the one-way valve 40 to the second end of the one-way valve 40, and the one-way valve 40 is open when the lubricating oil flows from the second end of the one-way valve 40 to the first end of the one-way valve 40.

[0058] The oil pump 10 provides power for the flow of the lubricating oil in the oil circuit cooling system of the electric drive system, so that the lubricating oil can smoothly flow through the electric drive system to cool and lubricate the electric drive system.

[0059] In an embodiment, as shown in Figure 1 The oil circuit cooling system of the electric drive system further comprises a lubricating oil pool 60 capable of storing a certain amount of lubricating oil. The oil inlet end of the oil pump 10 is communicated with the lubricating oil pool 60 to extract the lubricating oil in the lubricating oil pool 60 to realize the circulation of the lubricating oil.

[0060] In an embodiment, as shown in Figure 1 The first filtering device 70 is connected to the oil inlet end of the oil pump 10, which can filter out larger particles in the lubricating oil to avoid damage to the oil pump 10 when the lubricating oil flows through the inside of the oil pump 10.

[0061] As shown in Figure 1 When the lubricating oil pool 60 is provided in the oil circuit cooling system of the electric drive system, the first filtering device 70 is arranged between the lubricating oil pool 60 and the oil pump 10.

[0062] Alternatively, the first filtering device 70 is arranged on the oil pump 10, integrating the oil pump 10 and the first filtering device 70 as a whole to reduce the number of component interfaces, thereby reducing the cost of parts and assembly cost.

[0063] In an embodiment, as shown in Figure 1 A second filtering device 80 is arranged between the oil pump 10 and the control valve 20 to filter out smaller particles in the lubricating oil to avoid damage to the components in the electric drive system.

[0064] As shown in Figure 1 The heat exchanger 30 and the bypass branch 50 are connected in parallel, and the oil inlets of the heat exchanger 30 and the bypass branch 50 are connected to the control valve 20, the oil outlet of the bypass branch 50 is connected to the first end of the one-way valve 40, and the oil outlet of the heat exchanger 30 is connected to the second end of the one-way valve 40.

[0065] The heat exchanger 30 comprises a lubricating oil cavity for lubricating oil to flow through and a coolant cavity for coolant to flow through, and the coolant flowing through the coolant cavity exchanges heat with the lubricating oil flowing through the lubricating oil cavity, so as to reduce the temperature of the lubricating oil.

[0066] In the oil circuit cooling system of the electric drive system, the control valve 20 is controlled to selectively connect the oil pump 10 with the heat exchanger 30 or connect the oil pump 10 with the bypass branch 50.

[0067] In an embodiment, the control valve 20 is a two-position three-way electromagnetic valve, which has the advantages of sensitive response, low power, reliable operation and low cost.

[0068] Optionally, as shown in Figure 2 the control valve 20 comprises a valve sleeve 200, a second spool 201, an iron core 202, a sliding sleeve 203, a coil 204 and a second elastic member 205.

[0069] The valve sleeve 200 is provided with a second oil inlet 206, a second oil outlet 207 and a third oil outlet 208 which communicate with the inner cavity of the valve sleeve 200, the second spool 201 is arranged in the inner cavity of the valve sleeve 200, the iron core 202 is connected to one end of the second spool 201, the sliding sleeve 203 is sleeved outside the iron core 202, the coil 204 is sleeved outside the sliding sleeve 203, and the two ends of the second elastic member 205 are respectively connected to the other end of the second spool 201 and the valve sleeve 200.

[0070] When the coil 204 of the control valve 20 is not energized, the second elastic member 205 applies an upward pushing force to the second spool 201 (the direction is shown in Figure 2 , which is not the direction for limiting the pushing force applied by the second elastic member 205), and the second spool 201 is in the first position under the action of the pushing force of the second elastic member 205, at this time, the second oil inlet 206 and the second oil outlet 207 of the control valve 20 are in communication, and the control valve 20 connects the oil pump 10 with the heat exchanger 30.

[0071] After the coil 204 of the control valve 20 is energized, the coil 204 generates a magnetic field, so that the sliding sleeve 203 is magnetized, and the magnetized sliding sleeve 203 generates a downward pushing force on the iron core 202 (the direction is shown in Figure 2 , which is not the direction for limiting the pushing force applied by the elastic member), and the iron core 202 drives the second spool 201 to move downward, so that the second spool 201 is in the second position, at this time, the second oil inlet 206 and the third oil outlet 208 are in communication, and the control valve 20 connects the oil pump 10 with the bypass branch 50.

[0072] As shown in Figure 1As shown, the first end of the one-way valve 40 is connected to the first component 90 of the electric drive system, the second end of the one-way valve 40 is connected to the second component 100 of the electric drive system, the lubricating oil is blocked by the one-way valve 40 when flowing from the first end to the second end of the one-way valve 40, and the one-way valve 40 is open when the lubricating oil flows from the second end to the first end of the one-way valve 40.

[0073] In an embodiment, as shown in Figure 3 The one-way valve 40 includes a valve body 400, a first valve core 401, and a first elastic member 402.

[0074] The valve body 400 has a first oil inlet 403 and a first oil outlet 404 formed thereon and communicating with each other, and the cross-sectional area of the first oil inlet 403 is smaller than that of the first oil outlet 404. The first valve core 401 is arranged in the valve body 400, and the cross-sectional area of the first end of the first valve core 401 facing the first oil inlet 403 is smaller than that of the second end of the first valve core 401 facing the first oil outlet 404. The first elastic member 402 abuts against the second end of the first valve core 401 to apply a pushing force to the first valve core 401 in the direction of the first oil outlet 404.

[0075] When the lubricating oil does not flow through the one-way valve 40, the first elastic member 402 applies a pushing force to the first valve core 401 in the direction of the first oil inlet 403, and at this time, the end of the first valve core 401 with a smaller cross-sectional area blocks the communication between the first oil inlet 403 and the first oil outlet 404, and the one-way valve 40 is in a closed state.

[0076] When the lubricating oil flows from the first oil inlet 403 to the first oil outlet 404 of the one-way valve 40, the impact force of the lubricating oil flow pushes the first valve core 401 to move in the direction of the first oil outlet 404, at this time, the first oil inlet 403 and the first oil outlet 404 are in communication, and the lubricating oil can flow out from the first oil outlet 404, at this time, the one-way valve 40 is in an open state.

[0077] When the lubricating oil flows from the first oil outlet 404 to the first oil inlet 403 of the one-way valve 40, under the action of the impact force of the lubricating oil flow and the pushing force of the first elastic member 402, the end of the first valve core 401 with a smaller cross-sectional area blocks the communication between the first oil inlet 403 and the first oil outlet 404, at this time, the one-way valve 40 is in a one-way closed state, and the lubricating oil cannot flow out from the first oil inlet 403.

[0078] In an embodiment, as shown in Figure 1As shown, the first part 90 of the electric drive system includes a motor stator 91, a bearing 92 and a pinion shaft 93, and the second part 100 of the electric drive system includes a motor rotor 100. The plurality of cooling oil paths 110 of the oil path cooling system of the electric drive system are connected to the motor stator 91, the bearing 92, the pinion shaft 93 and the motor rotor 100 respectively.

[0079] Specifically, the motor rotor 100 is connected between the heat exchanger 30 and the first inlet port 403 of the one-way valve 40 (i.e. the second end of the one-way valve 40) through the cooling oil path 110, and the motor stator 91, the bearing 92 and the pinion shaft 93 are connected in parallel to the first outlet port 404 of the one-way valve 40 and the bypass branch 50 through the corresponding cooling oil paths 110, so as to realize the distribution of the lubricating oil.

[0080] In an embodiment, the cross-sectional areas of at least part of the plurality of cooling oil paths 110 are different, i.e. the pipe diameters of at least part of the plurality of cooling oil paths 110 are different. In this embodiment, by setting at least part of the cooling oil paths 110 to different pipe diameters, different distribution of the lubricating oil through the cooling oil paths 110 can be realized to meet the different requirements of the different parts of the electric drive system for the amount of lubricating oil, so as to realize accurate distribution of the lubricating oil, and effectively reduce the flow resistance of the lubricating oil.

[0081] Optionally, the areas of the inlet ports of at least part of the plurality of cooling oil paths 110 are different, wherein the inlet ports are connected to the first outlet port 404 of the one-way valve 40 and the bypass branch 50. By setting the areas of the inlet ports of the plurality of cooling oil paths 110 to be different, different control of the flow of the cooling oil paths 110 can be realized, so as to meet the different requirements of the parts of the electric drive system for the flow of the lubricating oil.

[0082] In an embodiment, based on different vehicle operating conditions, the switching of the path through which the lubricating oil flows is realized by controlling the valve 20 and the one-way valve 40, as follows:

[0083] Condition one

[0084] When the ambient temperature is low and the vehicle is in the starting stage, the control valve 20 is actuated to connect the oil pump 10 and the bypass branch 50, so that the lubricating oil does not flow through the heat exchanger 30 for heat exchange. Since the lower the temperature of the lubricating oil, the higher its viscosity, when the ambient temperature is low, the viscosity of the lubricating oil is high, and if the lubricating oil flows through the heat exchanger 30, the flow resistance of the lubricating oil of the oil path cooling system of the electric drive system will increase. Therefore, by controlling the lubricating oil not to flow through the heat exchanger 30 through the control valve 20 when the ambient temperature is low, the flow resistance of the lubricating oil is greatly reduced, so that the oil pump 10 is easier to start, and the load of the oil pump 10 and the energy consumption of the vehicle are reduced.

[0085] The lubricating oil flowing through the bypass branch 50 flows through the motor stator 91, the bearing 92 and the pinion shaft 93 of the electric drive system through the cooling oil circuit 110, and under the action of the one-way valve 40, the path of the lubricating oil flowing to the motor rotor 100 is cut off, so that the lubricating oil cannot flow through the motor rotor 100, thereby avoiding the occurrence of oil throwing loss of the motor rotor 100, reducing the energy consumption of the whole vehicle and improving the cruising range of the vehicle.

[0086] Case two

[0087] In some characteristic working conditions, for example, at the initial stage of vehicle operation or when the vehicle is in a light load state, the control valve 20 is actuated to connect the oil pump 10 and the bypass branch 50, and the lubricating oil does not flow through the heat exchanger 30 for heat exchange, so that the oil temperature of the lubricating oil is maintained within a reasonable range. The lower the temperature of the lubricating oil, the higher its viscosity. When the oil temperature of the lubricating oil is within a reasonable range, its viscosity is relatively low, which can reduce the oil stirring loss of the pinion shaft 93, thereby improving the operating efficiency of the electric drive system and the cruising range of the vehicle.

[0088] The lubricating oil flowing through the bypass branch 50 flows through the motor stator 91, the bearing 92 and the pinion shaft 93 of the electric drive system through the cooling oil circuit 110, and under the action of the one-way valve 40, the path of the lubricating oil flowing to the motor rotor 100 is cut off, so that the lubricating oil cannot flow through the motor rotor 100, thereby avoiding the occurrence of oil throwing loss of the motor rotor 100, reducing the energy consumption of the whole vehicle and improving the cruising range of the vehicle.

[0089] Case three

[0090] When the temperature of the lubricating oil of the oil circuit cooling system of the electric drive system is relatively high, for example, after the vehicle has been running for a period of time, the heat generated by the operation of the electric drive system causes the temperature of the lubricating oil to rise. The control valve 20 is actuated to connect the oil pump 10 and the heat exchanger 30, so that the lubricating oil flows through the heat exchanger 30 for heat exchange, thereby reducing the temperature of the lubricating oil and cooling the components of the electric drive system, thereby avoiding the occurrence of high-temperature failure of the electric drive system.

[0091] Another embodiment of the utility model provides a kind of vehicle, and the vehicle includes the oil circuit cooling system of electric drive system of any embodiment described above.

[0092] The oil circuit cooling system of the electric drive system is provided with a bypass branch connected in parallel with the heat exchanger, and the lubricating oil flows through the heat exchanger or the bypass branch through the control valve, so that the oil circuit cooling system can select different lubricating oil flow paths according to different working conditions, the temperature of the lubricating oil under different working conditions is accurately controlled, the load of the oil pump is reduced, the reliability and service life of the oil pump are improved, the operation efficiency of the electric drive system is effectively improved, and the cruising range of the vehicle is improved.

[0093] The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Although the utility model has been disclosed as above with a preferred embodiment, it is not intended to limit the utility model. Any skilled person in the art can make some changes or modifications to the disclosed technical content within the scope of the technical scheme of the utility model to obtain equivalent embodiments with equivalent changes, as long as the changes or modifications do not deviate from the technical scheme of the utility model. Any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the utility model still belong to the scope of the technical scheme of the utility model.

Claims

1. An oil circuit cooling system of an electric drive system, characterized by, include: Oil pump, control valve, heat exchanger, check valve and bypass branch; The oil pump, the control valve, the heat exchanger, and the check valve are connected in sequence. The two ends of the bypass branch are respectively connected to the first ends of the control valve and the check valve. The control valve controls the oil pump to connect to the heat exchanger or the bypass branch. The first end of the one-way valve is connected to the first component of the electric drive system, and the second end of the one-way valve is connected to the second component of the electric drive system. When the lubricating oil flows from the first end of the one-way valve to the second end of the one-way valve, the one-way valve is closed; when the lubricating oil flows from the second end of the one-way valve to the first end of the one-way valve, the one-way valve is open.

2. The oil circuit cooling system of an electric drive system according to claim 1, characterized in that, The first component includes the motor stator, gear shaft, and bearings of the electric drive system, and the second component includes the motor rotor of the electric drive system.

3. The oil circuit cooling system of an electric drive system according to claim 1 or 2, characterized in that, The one-way valve includes a valve body, a first valve core, and a first elastic element; The valve body has a first oil inlet and a first oil outlet that are connected, and the cross-sectional area of ​​the first oil inlet is smaller than the cross-sectional area of ​​the first oil outlet. The first valve core is disposed in the valve body, and the cross-sectional area of ​​the first end of the first valve core facing the first oil inlet is smaller than the cross-sectional area of ​​the second end of the first valve core facing the first oil outlet. The first elastic element abuts against the second end of the first valve core to apply a thrust to the first valve core toward the first oil outlet.

4. The oil circuit cooling system of an electric drive system according to claim 1, characterized in that, The control valve is a two-position three-way solenoid valve.

5. The oil circuit cooling system of an electric drive system according to claim 4, characterized in that, The control valve includes: a valve sleeve, a second valve core, an iron core, a sliding sleeve, a coil, and a second elastic element; The valve sleeve is provided with a second oil inlet, a second oil outlet and a third oil outlet communicating with the inner cavity of the valve sleeve. The second valve core is disposed in the inner cavity of the valve sleeve. The iron core is connected to one end of the second valve core. The sliding sleeve is sleeved on the outside of the iron core. The coil is sleeved on the outside of the sliding sleeve. The two ends of the second elastic element are respectively connected to the other end of the second valve core and the valve sleeve. When the coil is not energized, the second valve core is in the first position under the action of the second elastic element, the second oil inlet and the second oil outlet are connected, and the control valve connects the oil pump and the heat exchanger. After the coil is energized, the sliding sleeve drives the iron core to move, so that the second valve core is in the second position, the second oil inlet and the third oil outlet are connected, and the control valve connects the oil pump and the bypass branch.

6. The oil circuit cooling system of an electric drive system according to claim 2, wherein, The device includes multiple cooling oil circuits, each of which is connected to the motor rotor, the motor stator, the bearing, and the gear shaft, and at least some of the cooling oil circuits have different cross-sectional areas.

7. The oil circuit cooling system of an electric drive system according to claim 1, wherein, The oil pump is connected to a first filter device at its inlet end to filter out particulate matter in the lubricating oil.

8. The oil circuit cooling system of an electric drive system according to claim 7, characterized in that, The first filter device is mounted on the oil pump and integrated with it.

9. The oil circuit cooling system of an electric drive system according to claim 1, wherein, A second filter device is provided between the oil pump and the control valve to filter out particulate matter in the lubricating oil.

10. A vehicle characterized by comprising: The oil cooling system of the electric drive system as described in any one of claims 1-9.

Images