Oil-cooled motor

Abstract

The utility model discloses an oil cooling motor. A first oil way and a fourth oil way which are connected in parallel are arranged at the output end of an oil cooler; the fourth oil way communicates with the inner side of the rotor assembly. The first oil way penetrates through the side portion of the machine shell, a temperature control valve is arranged in the machine shell, the first oil way is divided into a second oil way and a third oil way, the second oil way is communicated to the periphery of the stator assembly, and the third oil way is communicated to the periphery of a bearing at the end of the motor. The temperature control valve is configured in the mode that when the temperature of oil flowing through the first oil way is lower than the preset temperature of the temperature control valve, the temperature control valve is closed, the second oil way is separated, and the third oil way is communicated. When the temperature of oil flowing through the first oil way is higher than the preset temperature of the temperature control valve, the temperature control valve is opened, and the second oil way and the third oil way are both communicated. The oil pump has the advantages of being compact in structure, good in cooling effect, high in stability and the like, the flow direction of an oil way is controlled through opening and closing of the temperature control valve, and therefore the problems that in the low-temperature environment, power consumption of the oil pump is large, and oil reaches a motor end bearing for a long time are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy vehicle driving, and in particular to an oil-cooled motor. Background Art

[0002] At present, most new energy vehicle drive devices use electric drive assemblies as the vehicle's drive device. Oil-cooled electric drives have the advantages of high power density, high integration, lightweight, and high performance, and have been widely used in the electric drive field.

[0003] In oil-cooled electric drive systems, bearing lubrication is active. An electronic or mechanical oil pump pressurizes the lubricating oil, passes it through channels inside the housing, and delivers it to the motor stator, rotor, bearings, and other locations for cooling and lubrication. However, because oil viscosity increases with decreasing temperature, when the oil is at a lower temperature, the viscosity is very high, requiring the oil pump to output a higher output pressure to ensure that the oil can quickly reach the parts where lubrication is required. Oil-cooled electric drive assemblies place higher demands on both the oil flow rate and the efficiency of the oil pump at low temperatures. If the lubricating oil flows too slowly at low temperatures, parts that are far from the oil pump outlet and have complex flow channels will experience dry grinding during the initial cold start of the electric drive at low temperatures (when the oil viscosity is high) due to the lack of timely delivery of lubricating oil. As damage accumulates, the abnormal wear caused by poor lubrication will later lead to risks such as poor NVH performance and bearing ablation. Utility Model Content

[0004] The technical problem to be solved by the present invention is to provide an oil-cooled motor with a compact structure, high stability and high cooling efficiency in response to the above-mentioned problems in the prior art.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] An oil-cooled motor comprises: an oil cooler, a stator assembly, a rotor assembly and a casing; the stator assembly and the rotor assembly are both arranged inside the casing, and the oil cooler is arranged outside the casing;

[0007] The output end of the oil cooler is provided with a first oil circuit and a fourth oil circuit connected in parallel; the fourth oil circuit is connected to the inner side of the rotor assembly to achieve lubrication and cooling of the inner side of the rotor assembly;

[0008] The first oil circuit runs through the side of the casing, and a temperature control valve is provided in the casing to split the first oil circuit into a second oil circuit and a third oil circuit. The second oil circuit is connected to the outer periphery of the stator assembly to achieve lubrication and cooling of the stator assembly, and the third oil circuit is connected to the outer periphery of the bearing at the end of the motor to achieve lubrication and cooling of the bearing.

[0009] In which, the temperature control valve is configured as follows: when the temperature of the oil flowing through the first oil circuit is lower than the preset temperature of the temperature control valve, the temperature control valve is in a closed state, the second oil circuit is in a blocked state, and the third oil circuit is in a connected state; when the temperature of the oil flowing through the first oil circuit is higher than the preset temperature of the temperature control valve, the temperature control valve is in an open state, and both the second oil circuit and the third oil circuit are in a connected state.

[0010] As a further improvement of the present invention, the stator assembly consists of a stator core and a winding embedded in the stator core. The stator core is composed of multiple sections of stator punchings stacked together. A plurality of oil holes are circumferentially distributed on the outer circle of the stator punching, and winding wire grooves are distributed on the inner circle of the stator punching. The winding wire grooves of adjacent stacked sections overlap and are aligned, and the oil holes of the stacked sections are connected to each other to form an internal oil channel.

[0011] As a further improvement of the present invention, the stator assembly is fixed in the casing, and a cooling cavity is formed between the stator assembly, the rotor assembly and the casing. The rotor assembly passes through the inner side of the stator assembly, and both ends are rotatably connected to the end covers of the casing. A shaft oil passage communicating with the cooling cavity is provided on the inner side of the rotor assembly, and the fourth oil passage is communicated with the shaft oil passage; an internal oil passage formed on the outer circle of the stator core is communicated with the cooling cavity;

[0012] When the temperature control valve is in the closed state, the cooling oil input from the first oil circuit flows through the third oil circuit to the outer periphery of the bearing at the end of the motor to achieve bearing lubrication and cooling; when the temperature control valve is in the open state, part of the cooling oil input from the first oil circuit flows through the third oil circuit to the outer periphery of the bearing at the end of the motor to achieve bearing lubrication and cooling, and the other part enters the cooling cavity through the second oil circuit and flows through the internal oil channel of the outer circle of the stator core to disturb and cool the stator core, and then cool the winding;

[0013] The cooling oil input from the fourth oil circuit first cools the inside of the rotor assembly through the shaft oil channel, and then sprays onto the inner annular surface of the winding. The cooling oil is discharged through the oil outlet at the bottom of the casing.

[0014] As a further improvement of the present invention, an oil ring is provided at the end of the stator core, and a plurality of oil spray holes are distributed circumferentially on the outer circle side of the oil ring to connect the internal oil channel formed by the outer circle of the stator core, the oil rings at both ends of the stator core, and the cooling cavity; when the temperature control valve is in the open state, part of the cooling oil input by the first oil circuit flows to the outer periphery of the bearing at the end of the motor through the third oil circuit to achieve bearing lubrication and cooling, and the other part enters the cooling cavity through the second oil circuit, flows through the internal oil channel of the outer circle of the stator core to disturb and cool the stator core, and then flows through the oil ring and is sprayed onto the winding surface through the oil spray holes to achieve winding cooling.

[0015] As a further improvement of the present invention, the oil spray holes are arranged obliquely on the oil ring to achieve oblique spraying of the cooling oil onto the winding surface.

[0016] As a further improvement of the present invention, the rotor assembly includes a rotor core and a hollow rotating shaft. The two ends of the hollow rotating shaft are respectively rotatably connected to the end covers at both ends of the casing. The rotor core is fixed on the hollow rotating shaft, and the hollow rotating shaft drives the rotor core to rotate inside the stator assembly.

[0017] As a further improvement of the present invention, a shaft oil channel is provided on the inner side of the hollow shaft, and an oil-swinging hole is provided on the shaft oil channel, and multiple oil-swinging holes are respectively located on both sides of the rotor core; the cooling oil input by the fourth oil circuit first cools the hollow shaft through the shaft oil channel, and then is sprayed to the inner annular surface of the winding through the oil-swinging hole to achieve cooling of the end winding and the inner annular surface of the winding.

[0018] As a further improvement of the present invention, the temperature control valve adopts a valve with temperature-sensitive paraffin as the valve core.

[0019] As a further improvement of the present invention, the temperature control valve is an electronic temperature control valve.

[0020] As a further improvement of the present invention, an oil filter is provided between the output end of the oil cooler and the first oil circuit and the fourth oil circuit.

[0021] Compared with the prior art, the advantages of the present invention are:

[0022] The oil-cooled motor of the present invention is provided with a first oil circuit and a fourth oil circuit in parallel at the output end of the oil cooler; the fourth oil circuit is connected to the inner side of the rotor assembly, so that the cooling oil flows to the inner side of the rotor assembly for cooling; the first oil circuit is passed through the side of the casing, and a temperature control valve is provided in the casing, so that the first oil circuit is divided into a second oil circuit and a third oil circuit, the second oil circuit is connected to the outer periphery of the stator assembly, so that the cooling oil flows to the outer periphery of the stator assembly for cooling, and the third oil circuit is connected to the outer periphery of the bearing at the end of the motor, so that the cooling oil flows to the end of the motor for cooling the bearing; further, the temperature control valve is provided. The valve is configured as follows: when the temperature of the oil flowing through the first oil circuit is lower than the preset temperature of the thermostatic valve, the thermostatic valve closes, isolating the second oil circuit and connecting the third oil circuit, allowing all cooling oil to flow to the motor end for bearing cooling. When the temperature of the oil flowing through the first oil circuit exceeds the preset temperature of the thermostatic valve, the thermostatic valve opens, connecting the second and third oil circuits, and allowing cooling oil to flow to the periphery of the stator assembly and the motor end, respectively, for cooling. This utility model redirects the lubricating oil by opening and closing the thermostatic valve integrated into the motor housing, thereby reducing the resistance of the oil chamber at low temperatures and achieving better lubrication of the motor bearings. Furthermore, the opening and closing of the thermostatic valve effectively reduces the power consumption of the oil pump when the lubricating oil viscosity is high, thereby improving the oil pump's operating efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the structural principle of the oil-cooled motor in a specific embodiment of the present utility model;

[0024] Figure 2 This is a partial schematic diagram of the oil flow direction when the temperature control valve is closed in a specific embodiment of the present invention;

[0025] Figure 3 This is a partial schematic diagram of the oil flow direction when the temperature control valve is open in a specific embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram of the overall flow of oil when the temperature control valve is open in a specific embodiment of the present invention;

[0027] Figure 5 This is a schematic diagram of the structural principle of the stator punching sheet in a specific embodiment of the present utility model;

[0028] Figure 6 This is a schematic diagram of the structural principle of the oil ring in a specific embodiment of the present utility model;

[0029] Legend: 1. Oil cooler; 2. First oil circuit; 3. Second oil circuit; 4. Temperature control valve; 5. Stator core; 51. Stator punching plate; 52. Oil hole; 53. Winding wire groove; 54. Oil guide groove; 6. Casing; 7. Third oil circuit; 8. Front end cover; 9. Bearing; 10. Oil-spinning hole; 11. Rotor core; 12. Oil ring; 121. Oil injection hole; 13. Winding; 14. Hollow shaft; 15. Fourth oil circuit; 16. Shaft oil channel; 17. Cooling cavity. DETAILED DESCRIPTION

[0030] The present invention will be further described below with reference to the accompanying drawings and specific preferred embodiments, but the scope of protection of the present invention is not limited thereby.

[0031] In the description of the present invention, it should be understood that the terms "side", "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or suggesting 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 one or more of the features. In the description of the present utility model, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0033] Example

[0034] like Figures 1 to 6 As shown, the oil-cooled motor of the present invention includes an oil cooler 1, a stator assembly, a rotor assembly, and a housing 6. The stator assembly and the rotor assembly are both arranged inside the housing 6, and the oil cooler 1 is arranged outside the housing 6. The oil cooler 1 is used to supply oil for cooling and lubrication. The output end of the oil cooler 1 is provided with a first oil circuit 2 and a fourth oil circuit 15 connected in parallel, and an oil filter is provided between the output end of the oil cooler 1 and the first oil circuit 2 and the fourth oil circuit 15 to improve the cleanliness of the cooling oil entering the oil-cooled motor. The fourth oil circuit 15 is connected to the inside of the rotor assembly to achieve lubrication and cooling of the inside of the rotor assembly;

[0035] The first oil circuit 2 runs through the side of the casing 6, and a temperature control valve 4 is provided in the casing 6 to split the first oil circuit 2 into a second oil circuit 3 and a third oil circuit 7. The second oil circuit 3 is connected to the outer periphery of the stator assembly to achieve lubrication and cooling of the stator assembly, and the third oil circuit 7 is connected to the outer periphery of the bearing 9 at the end of the motor to achieve lubrication and cooling of the bearing 9.

[0036] In this embodiment, the temperature control valve 4 is configured as follows: when the temperature of the oil flowing through the first oil circuit 2 is lower than the preset temperature of the temperature control valve 4, the temperature control valve 4 is in a closed state, the second oil circuit 3 is in a blocked state, and the third oil circuit 7 is in a connected state. Figure 2 When the temperature of the oil flowing through the first oil circuit 2 is higher than the preset temperature of the temperature control valve 4, the temperature control valve 4 is in the open state, and the second oil circuit 3 and the third oil circuit 7 are in the connected state, as shown Figure 3 and Figure 4 shown.

[0037] In this embodiment, a first oil circuit 2 and a fourth oil circuit 15 are provided in parallel at the output end of the oil cooler 1; the fourth oil circuit 15 is connected to the inner side of the rotor assembly, so that the cooling oil flows to the inner side of the rotor assembly for cooling; the first oil circuit 2 is passed through the side of the casing 6, and a temperature control valve 4 is provided in the casing 6, and the first oil circuit 2 is split into a second oil circuit 3 and a third oil circuit 7. The second oil circuit 3 is connected to the outer periphery of the stator assembly, so that the cooling oil flows to the outer periphery of the stator assembly for cooling, and the third oil circuit 7 is connected to the outer periphery of the bearing 9 at the end of the motor, so that the cooling oil flows to the end of the motor for bearing cooling. Furthermore, the temperature control valve 4 is configured as follows: when the temperature of the oil flowing through the first oil circuit 2 is lower than the preset temperature of the temperature control valve 4, the temperature control valve 4 closes, the second oil circuit 3 is blocked, and the third oil circuit 7 is connected, and the cooling oil flows entirely to the motor end for bearing cooling; when the temperature of the oil flowing through the first oil circuit 2 is higher than the preset temperature of the temperature control valve 4, the temperature control valve 4 opens, the second oil circuit 3 and the third oil circuit 7 are both connected, and the cooling oil flows to the periphery of the stator assembly and the motor end, respectively, for cooling. This embodiment changes the flow direction of the lubricating oil by opening and closing the temperature control valve 4 integrated in the motor housing, thereby reducing the resistance of the oil chamber under low temperature conditions, thereby achieving the purpose of better lubrication of the motor bearings. At the same time, the opening and closing of the temperature control valve 4 can effectively reduce the power consumption of the oil pump when the viscosity of the lubricating oil is high, thereby improving the operating efficiency of the oil pump.

[0038] like Figure 1 and Figure 5 As shown, the stator assembly consists of a stator core 5 and a winding 13 embedded in the stator core 5. The stator core 5 is composed of multiple sections of stator punchings 51 stacked together. Multiple oil holes 52 are circumferentially distributed on the outer circle of the stator punchings 51. An oil guide groove 54 is provided on the outer edge of the stator punchings 51. Winding wire grooves 53 are distributed on the inner circle of the stator punchings 51. The winding wire grooves 53 of adjacent stacked sections overlap and are aligned, and the oil holes 52 of the stacked sections are connected to each other to form an internal oil channel.

[0039] It is understood that in actual use, the length of the stator lamination stack can be varied, as long as the total axial length of the stator core 5 remains unchanged. The specific type and number of laminations can also be varied. Adjacent lamination stacks can be designed as straight or staggered segments, as long as no dead zones for oil flow are formed. These segments can have oil guide grooves on the edges of the stator laminations. The types of laminations can also be stacked in three, two, or more configurations.

[0040] In this embodiment, a cooling cavity 17 is formed between the stator assembly, the rotor assembly, and the housing 6. The rotor assembly passes through the interior of the stator assembly, with its ends rotatably connected to the front cover 8 and rear cover 8 of the housing 6, respectively. A shaft oil passage 16 is provided inside the rotor assembly, communicating with the cooling cavity 17. The fourth oil passage 15 is also connected to the shaft oil passage 16. An internal oil passage formed on the outer circumference of the stator core 5 is also connected to the cooling cavity 17.

[0041] When the temperature control valve 4 is closed, the cooling oil input from the first oil circuit 2 flows through the third oil circuit 7 to the outer periphery of the bearing 9 at the end of the motor to achieve lubrication and cooling of the bearing 9. When the temperature control valve 4 is open, part of the cooling oil input from the first oil circuit 2 flows through the third oil circuit 7 to the outer periphery of the bearing 9 at the end of the motor to achieve lubrication and cooling of the bearing 9, while the other part enters the cooling cavity 17 through the second oil circuit 3 and flows through the internal oil channel of the outer circumference of the stator core 5 to disturb the stator core 5 and then cool the winding 13.

[0042] The cooling oil input from the fourth oil passage 15 first cools the inside of the rotor assembly through the shaft oil passage 16 , and then is sprayed onto the inner annular surface of the winding 13 , and the cooling oil is discharged through the oil outlet at the bottom of the housing 6 .

[0043] like Figure 1 and Figure 6 As shown, an oil ring 12 is installed at the end of the stator core 5. Multiple oil spray holes 121 are distributed circumferentially on the outer circumference of the oil ring 12, connecting the internal oil passages formed by the outer circumference of the stator core 5, the oil rings 12 at both ends of the stator core 5, and the cooling cavity 17. When the temperature control valve 4 is open, a portion of the cooling oil input from the first oil passage 2 flows through the third oil passage 7 to the outer circumference of the bearing 9 at the end of the motor to lubricate and cool the bearing 9. The remaining portion enters the cooling cavity 17 through the second oil passage 3, flows through the internal oil passages of the outer circumference of the stator core 5, disturbing the stator core 5 and cooling it. The remaining portion then flows through the oil ring 12 and is sprayed onto the surface of the winding 13 through the oil spray holes 121 to cool the winding 13.

[0044] Furthermore, the oil spray holes 121 are tiltedly arranged on the oil ring 12 so that the cooling oil is tiltedly sprayed onto the surface of the winding 13 at a certain angle, thereby improving the cooling efficiency of the winding 13 .

[0045] In this embodiment, the shape of the oil hole 52 can be rectangular, circular, square, or elliptical, or can also be a fan-shaped or similar shape. The oil injection holes 121 can be circular, square, conical, or elliptical, or can be tapered or gradually expanded. The angle and number of the oil injection holes 121 can be adjusted to improve the spray effect on the winding 13. The oil injection holes 121 can be a single-layer structure or a multi-layer structure in the radial direction; the oil injection holes 121 can be evenly distributed or unevenly distributed in the circumferential direction.

[0046] like Figure 1 As shown, the rotor assembly includes a rotor core 11 and a hollow shaft 14. The two ends of the hollow shaft 14 are rotatably connected to the end covers at both ends of the casing 6. The rotor core 11 is fixed on the hollow shaft 14, and the hollow shaft 14 drives the rotor core 11 to rotate inside the stator assembly.

[0047] Furthermore, a shaft oil passage 16 is provided inside hollow shaft 14, and oil-spinning holes 10 are provided in shaft oil passage 16. Multiple oil-spinning holes 10 are located on both sides of rotor core 11. Cooling oil supplied by fourth oil passage 15 first cools hollow shaft 14 through shaft oil passage 16, and then is sprayed through oil-spinning holes 10 onto the inner annular surface of winding 13, thereby cooling both the end windings and the inner annular surface of winding 13.

[0048] In this embodiment, the temperature control valve 4 uses a valve with temperature-sensitive paraffin as the valve core, which has the characteristics of simple structure, convenient installation and precise control. In other embodiments, the temperature control valve 4 can also be an electronic temperature control valve.

[0049] In this embodiment, since the bearing 9 at the end of the hollow shaft 14 is far away from the outlet of the oil cooler 1, it takes a long time for the oil to reach the bearing chamber at the end of the motor under low temperature conditions. In order to reach the bearing chamber in time to lubricate the bearing 9, the oil pump needs to output a higher pressure, which will increase the power consumption of the oil pump. In addition, under low temperature conditions, the winding 13 in the stator assembly does not need to be cooled by lubricating oil. Based on this application scenario, the temperature control valve 4 is integrated into the housing 6 of the motor. Under low temperature conditions, the temperature control valve 4 is in a closed state, closing the second oil path 3 for the lubricating oil to enter the oil channel of the stator core 5. Figure 2 As shown, the oil in the first oil circuit 2 is concentratedly used for lubricating the bearing 9. As the oil temperature rises (the heat source may come from the heat exchange process between the lubricating oil and the coolant in the oil cooler and the oil radially thrown out by the hollow shaft 14 cools the inner ring surface of the winding 13 and then heats up), Figure 1 As shown by the dotted arrow on the hollow shaft 14, the temperature control valve 4 gradually opens the second oil path flowing to the outer periphery of the stator core 5, as shown in FIG. Figure 3 and Figure 4 As shown in the figure, the oil passes through the oil holes 52 on the outer ring of the stator core 5, eventually gathering at the sealed connection between the inner side of the housing 6 and the oil ring 12. It is then squeezed out of the evenly distributed oil injection holes 12 on the oil ring 12 to cool the outer ring of the winding 13. At this point, the oil viscosity is significantly lower than at low temperatures. Under the same pipe diameter, the overall flow resistance of the oil circuit is significantly reduced, and the oil flow rate is faster than at low temperatures. This effectively solves the problems of high oil pump power consumption and poor lubrication of parts far from the oil cooler 1 outlet when operating with high-viscosity oil at low temperatures.

[0050] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiment. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, certain improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. An oil-cooled motor, characterized in that: include: An oil cooler (1), a stator assembly, a rotor assembly, and a casing (6); the stator assembly and the rotor assembly are both arranged inside the casing (6), and the oil cooler (1) is arranged outside the casing (6); The output end of the oil cooler (1) is provided with a first oil circuit (2) and a fourth oil circuit (15) connected in parallel; the fourth oil circuit (15) is connected to the inner side of the rotor assembly to achieve lubrication and cooling of the inner side of the rotor assembly; The first oil circuit (2) runs through the side of the housing (6), and a temperature control valve (4) is provided in the housing (6) for splitting the first oil circuit (2) into a second oil circuit (3) and a third oil circuit (7), wherein the second oil circuit (3) is connected to the outer periphery of the stator assembly to achieve lubrication and cooling of the stator assembly, and the third oil circuit (7) is connected to the outer periphery of the bearing (9) at the end of the motor to achieve lubrication and cooling of the bearing (9); The temperature control valve (4) is configured such that: when the temperature of the oil flowing through the first oil circuit (2) is lower than the preset temperature of the temperature control valve (4), the temperature control valve (4) is in a closed state, the second oil circuit (3) is in a blocked state, and the third oil circuit (7) is in a connected state; when the temperature of the oil flowing through the first oil circuit (2) is higher than the preset temperature of the temperature control valve (4), the temperature control valve (4) is in an open state, and both the second oil circuit (3) and the third oil circuit (7) are in a connected state.

2. The oil-cooled motor according to claim 1, characterized in that: The stator assembly is composed of a stator core (5) and a winding (13) embedded in the stator core (5); the stator core (5) is composed of a plurality of stacked stator sheets (51); a plurality of oil holes (52) are distributed circumferentially on the outer circumference of the stator sheet (51); winding wire grooves (53) are distributed on the inner circumference of the stator sheet (51); the winding wire grooves (53) of adjacent stacked sections are aligned and overlapped, and the oil holes (52) of the stacked sections are interconnected to form an internal oil passage.

3. The oil-cooled motor according to claim 2, characterized in that: A cooling cavity (17) is formed between the stator assembly, the rotor assembly and the housing (6); the rotor assembly passes through the inner side of the stator assembly, and both ends are rotatably connected to the end covers of the housing (6); a shaft oil passage (16) communicating with the cooling cavity (17) is provided on the inner side of the rotor assembly, and the fourth oil passage (15) is communicated with the shaft oil passage (16); an internal oil passage formed on the outer circle of the stator core (5) is communicated with the cooling cavity (17); When the temperature control valve (4) is in a closed state, the cooling oil inputted from the first oil circuit (2) flows to the outer periphery of the bearing (9) at the end of the motor via the third oil circuit (7) to achieve lubrication and cooling of the bearing (9); when the temperature control valve (4) is in an open state, a portion of the cooling oil inputted from the first oil circuit (2) flows to the outer periphery of the bearing (9) at the end of the motor via the third oil circuit (7) to achieve lubrication and cooling of the bearing (9), and the other portion enters the cooling cavity (17) via the second oil circuit (3) and flows through the internal oil channel of the outer circle of the stator core (5) to disturb the stator core (5) and then cool the winding (13); The cooling oil inputted from the fourth oil circuit (15) first cools the inside of the rotor assembly through the shaft oil passage (16), and then is sprayed onto the inner annular surface of the winding (13). The cooling oil is discharged through the oil outlet at the bottom of the housing (6).

4. The oil-cooled motor according to claim 3, characterized in that: An oil ring (12) is provided at the end of the stator core (5), and a plurality of oil spray holes (121) are distributed circumferentially on the outer circumference of the oil ring (12), so as to realize the connection between the internal oil passage formed on the outer circumference of the stator core (5), the oil rings (12) at both ends of the stator core (5), and the cooling cavity (17); when the temperature control valve (4) is in an open state, a portion of the cooling oil inputted from the first oil passage (2) flows to the outer circumference of the bearing (9) at the end of the motor via the third oil passage (7), so as to realize lubrication and cooling of the bearing (9); the other portion enters the cooling cavity (17) via the second oil passage (3), flows through the internal oil passage on the outer circumference of the stator core (5), disturbs the stator core (5), and then flows through the oil ring (12) and is sprayed onto the surface of the winding (13) via the oil spray holes (121), so as to realize cooling of the winding (13).

5. The oil-cooled motor according to claim 4, characterized in that: The oil spray holes (121) are arranged obliquely on the oil ring (12) to achieve oblique spraying of cooling oil onto the surface of the winding (13).

6. The oil-cooled motor according to claim 3, characterized in that: The rotor assembly comprises a rotor core (11) and a hollow rotating shaft (14). The two ends of the hollow rotating shaft (14) are rotatably connected to the end covers at the two ends of the casing (6). The rotor core (11) is fixed on the hollow rotating shaft (14). The hollow rotating shaft (14) drives the rotor core (11) to rotate inside the stator assembly.

7. The oil-cooled motor according to claim 6, characterized in that: A shaft oil passage (16) is provided on the inner side of the hollow shaft (14), and an oil-swinging hole (10) is provided on the shaft oil passage (16). A plurality of the oil-swinging holes (10) are respectively located on both sides of the rotor core (11). The cooling oil inputted from the fourth oil passage (15) first cools the hollow shaft (14) through the shaft oil passage (16), and then is sprayed onto the inner annular surface of the winding (13) through the oil-swinging hole (10), so as to achieve cooling of the end winding and the inner annular surface of the winding (13).

8. The oil-cooled motor according to any one of claims 1 to 7, characterized in that: The temperature control valve (4) adopts a valve with temperature-sensitive paraffin as the valve core.

9. The oil-cooled motor according to any one of claims 1 to 7, characterized in that: The temperature control valve (4) is an electronic temperature control valve.

10. The oil-cooled motor according to any one of claims 1 to 7, characterized in that: An oil filter is provided between the output end of the oil cooler (1) and the first oil circuit (2) and the fourth oil circuit (15).

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