A cooling and lubrication device, a speed reducer and an electric drive system

Abstract

This utility model relates to the field of new energy vehicle technology, specifically to a cooling and lubrication device, a reducer, and an electric drive system. It includes a filter assembly; an oil pump assembly for circulating cooling oil; and a sealing assembly disposed between the filter assembly and the oil pump assembly. The bottom end of the sealing assembly can fix the filter assembly and forms a first oil chamber with it. The top end of the sealing assembly forms a second oil chamber with the oil pump assembly. Cooling oil placed in the first oil chamber can flow unidirectionally into the second oil chamber through the sealing assembly. This utility model directly connects the sealing assembly to the filter assembly and the oil pump assembly, thereby forming a first oil chamber and a second oil chamber that is unidirectionally connected to the first oil chamber. This reduces the number of parts during assembly, reduces the contamination of the cooling oil in the oil pump assembly by debris from the parts during assembly, thereby improving the service life of the oil pump assembly and ensuring the flow rate of the cooling oil.

Description

Technical Field

[0001] This utility model relates to the field of new energy vehicle technology, specifically to a cooling and lubrication device, a reducer, and an electric drive system. Background Technology

[0002] The new energy electric drive system is the core powertrain that converts electrical energy into mechanical energy. Its performance directly determines key driving indicators such as the vehicle's climbing ability, acceleration, and top speed. It mainly includes a drive motor, motor controller, reducer, and cooling and lubrication system. The cooling and lubrication system includes existing components such as oil pumps, oil filters, and heat exchangers. Figure 1 As shown, the existing oil pump and oil filter are integrated within the electric drive housing. A cooling oil circulation pipe is formed between the electric drive housing and the existing oil pump and oil filter. The existing oil pump is a cycloidal gear pump, which includes a rotor pump and a pump cover. The rotor pump and the pump cover cooperate to form a sealed upper oil chamber, through which cooling oil is circulated. The oil filter includes an existing suction oil filter, which is fixed relative to the inner bottom of the electric drive housing by a fixed bracket at the top and a lower end cover at the bottom. The pump cover is a U-shaped cover with an open end, and the open end of the pump cover is connected to the existing suction oil filter. The fixed bracket of the oil filter forms a sealed lower oil chamber. Cooling oil enters the lower oil chamber through the oil inlet of the suction filter. The pump cover forms a through hole to connect the lower oil chamber and the upper oil chamber, so that the cooling oil flows through the upper oil chamber and enters the cooling oil circulation pipe through the oil outlet of the rotor pump. The cooling oil flows in the cooling oil circulation pipe, so that the flow path of the cooling oil is: cooling oil circulation pipe, oil inlet of the existing suction filter, hollow position of the existing suction filter, lower oil chamber, through hole, upper oil chamber, oil outlet of the rotor pump, cooling oil circulation pipe.

[0003] The inventors of this utility model have discovered that in the existing cooling and lubrication system manufacturing process, existing oil pumps and oil filters need to be produced on different production lines first, and then the two are assembled inside the electric drive housing. During transportation or assembly, the bottom end of the pump cover of the existing oil pump is an open end, which is in direct contact with the external environment and easily adsorbs debris (metal shavings, sealant) or dust and other impurities. During assembly, the open end of the pump cover and the top end of the oil filter are joined to form the lower oil chamber. Impurities from the open end of the pump cover remain in the lower oil chamber. After assembly, as the cooling oil flows through the lower oil chamber into the upper oil chamber, the cooling oil can carry the impurities from the lower oil chamber into the upper oil chamber, which can then get stuck in the gap between the outer and inner rotors of the rotor pump, causing the rotor pump to jam or even seize up, thereby reducing the flow rate of the cooling oil and reducing the cooling and lubrication effect of the cooling and lubrication system. Utility Model Content

[0004] This utility model addresses the problem of foreign objects inside the pump cover affecting the stable operation of the oil pump during the assembly of a cooling and lubrication device into the electric drive housing. It provides a cooling and lubrication device, a reducer, and an electric drive system, with the specific technical solution as follows: A cooling and lubrication device is disposed inside an electric drive housing, comprising: a filter assembly for filtering cooling oil; an oil pump assembly for circulating cooling oil; and a sealing assembly disposed between the filter assembly and the oil pump assembly. The bottom end of the sealing assembly can fix the filter assembly and form a first oil chamber with the filter assembly, and the top end of the sealing assembly forms a second oil chamber with the oil pump assembly. Cooling oil placed in the first oil chamber can flow into the second oil chamber unidirectionally through the sealing assembly. The filter assembly, the oil pump assembly, and the sealing assembly are integrally assembled inside the electric drive housing.

[0005] Furthermore, the sealing assembly includes a U-shaped sealing cap with an open end, the U-shaped sealing cap being coaxial with the filter assembly and the oil pump assembly, the open end of the U-shaped sealing cap forming a positioning groove, the top end of the filter assembly being able to be embedded into the positioning groove to form a first oil chamber, and the non-open end of the U-shaped sealing cap being able to be sealed to the bottom end of the oil pump assembly to form a second oil chamber.

[0006] Preferably, the non-open ends of the U-shaped sealing cover form an oil inlet passage and an oil outlet passage respectively; the oil inlet passage is parallel to the axis of the filter assembly or oil pump assembly, and it passes through the non-open ends of the U-shaped sealing cover to connect the first oil chamber and the second oil chamber, and the oil inlet of the rotor circulation pump placed inside the second oil chamber is connected to the oil inlet passage; the oil outlet passage is formed on the outside of the non-open ends of the U-shaped sealing cover, and the oil outlet passage can connect the second oil chamber and the cooling oil circulation pipe, and the oil outlet of the rotor circulation pump is connected to the oil outlet passage.

[0007] Preferably, sealing rings are connected to the outer side of the U-shaped sealing cover and the outer side of the oil pump assembly. The U-shaped sealing cover, the oil pump assembly, the inner wall of the electric drive housing, and the sealing rings form a cooling oil circulation pipe. The sealing rings connected to the outer side of the U-shaped sealing cover can separate the oil outlet position of the oil pump assembly and the oil inlet position of the filter assembly.

[0008] Preferably, the oil pump assembly includes a power source that drives the rotor circulation pump to rotate, the power source and the rotor circulation pump are placed inside the pump body, and the outside of the pump body is in contact with the cooling oil circulation pipe.

[0009] Preferably, an enlarged hole is formed at the bottom of the pump body, and the non-open end of the U-shaped sealing cover is embedded in the enlarged hole to form a second oil chamber.

[0010] Preferably, the bottom end of the pump body is bolted to the non-open end of the U-shaped sealing cover.

[0011] Preferably, the filter assembly includes an oil suction filter element for filtering cooling oil. The oil suction filter element has a central cylindrical structure, with a lower end cap embedded at the bottom and a positioning groove embedded at the top. The position where the oil suction filter element does not contact the lower end cap or the positioning groove is the oil inlet position of the first oil chamber.

[0012] A speed reducer includes a cooling and lubrication device.

[0013] An electric drive system including a speed reducer.

[0014] As can be seen from the above technical solution, this utility model has the following beneficial effects: This invention integrates the sealing component directly into the interior of the electric drive housing along with the filter component and the oil pump component, thereby forming a first oil chamber and a second oil chamber that is unidirectionally connected to the first oil chamber. This reduces the assembly process and minimizes the contamination of the cooling oil in the oil pump component by debris from the parts during assembly, thereby improving the service life of the oil pump component and ensuring the flow rate of the cooling oil. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of an existing cooling and lubrication system. Figure 2 This is a schematic diagram of the structure of an embodiment of the cooling and lubrication device of this utility model; Figure 3 This is a schematic diagram of another embodiment of the cooling and lubrication device of this utility model.

[0016] In the diagram: 1. Filter assembly; 11. Suction filter element; 12. Lower end cover; 2. Sealing assembly; 21. U-shaped sealing cover; 22. Positioning groove; 23. Oil inlet passage; 24. Oil outlet passage; 25. Sealing ring; 3. Oil pump assembly; 31. Pump body; 32. Power source; 33. Rotary circulation pump; 4. First oil chamber; 5. Second oil chamber; 7. Existing cooling and lubrication system; 72. Existing suction filter; 73. Fixed bracket; 74. Pump cover; 75. Existing oil pump; 76. Upper oil chamber; 77. Lower oil chamber; 78. Cooling oil circulation pipe; 79. Rotary pump. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] In the description of the embodiments of this utility model, it should be noted that the terms "inner", "outer", "upper", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed when in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0019] Example 1 like Figure 2 As shown, this embodiment is a cooling and lubrication device. The cooling and lubrication device is installed inside the electric drive housing. The cooling and lubrication device also includes: a filter assembly 1 for filtering cooling oil; an oil pump assembly 3 for circulating cooling oil; and a sealing assembly 2 disposed between the filter assembly 1 and the oil pump assembly 3. The bottom end of the sealing assembly 2 can fix the filter assembly 1 and form a first oil chamber 4 with the filter assembly 1. The top end of the sealing assembly 2 forms a second oil chamber 5 with the oil pump assembly 3. The cooling oil placed in the first oil chamber 4 can flow into the second oil chamber 5 in one direction through the sealing assembly 2. The filter assembly 1, the oil pump assembly 3 and the sealing assembly 2 are integrally assembled inside the electric drive housing.

[0020] Specifically, a cavity for housing the cooling and lubrication device is formed inside the electric drive housing. A cooling oil circulation pipe 78 is formed between the cooling and lubrication device and the inner wall of the electric drive housing, so that the cooling and lubrication device can drive the cooling oil to flow between the cooling oil circulation pipe 78, thereby exchanging heat with the heat exchanger and circulating to cool the heat-generating parts in the electric drive system.

[0021] Secondly, the cooling oil is filtered through the filter assembly 1 and enters the first oil chamber 4, passes through the sealing assembly 2 and enters the second oil chamber 5. It then flows out of the second oil chamber 5, separates from the oil pump assembly 3, and finally enters the cooling oil circulation pipe 78. During production and assembly, the top end of the filter assembly 1 is fixedly connected to the bottom end of the sealing assembly 2 to form a sealed first oil chamber 4, and the top end of the sealing assembly 2 is fixedly connected to the bottom end of the oil pump assembly 3 to form a sealed second oil chamber 5. The bottom end of the oil pump assembly 3 can draw cooling oil from the first oil chamber 4, which flows through and is drawn out of the second oil chamber 5. The sealing assembly 2 is a single structural component. During production and assembly, it is first fixedly connected to the top end of the filter assembly 1 to determine the relative position between the filter assembly 1 and the electric drive housing. Then, the bottom end of the oil pump assembly 3 (standard part) is fixedly connected to the sealing assembly 2. The top of component 2 is fixedly connected, thereby determining the relative position between the oil pump assembly 3 and the electric drive housing, thus separating the cooling oil between the filter assembly 1 and the electric drive housing from the cooling oil between the oil pump assembly 3 and the electric drive housing, thereby ensuring the circulation effect of the cooling oil; the assembly process of the sealing component 2 reduces the process of transporting products from different production lines to the assembly line for assembly compared to the assembly process of the existing cooling and lubrication system 7, avoiding the contamination of the cooling oil by impurities in the existing pump cover 74, so that even if the bottom end of the oil pump assembly 3 is an open end, it does not need to absorb impurities through the transportation process, and it can be directly assembled with the sealing component and the filter assembly on the same production line to form a whole, thereby reducing the impurities in the cooling oil in the first oil chamber 4 and the second oil chamber 5, thereby ensuring the speed of cooling oil flow in the existing oil pump 75.

[0022] Secondly, the assembly process in this embodiment is as follows: on the same production line, the filter assembly 1 is installed inside the electric drive housing, the sealing assembly 2 is connected to the filter assembly 1 and the electric drive housing to form the first oil chamber 4, and the oil pump assembly 3 is connected to the sealing assembly 2 and the electric drive housing to form the second oil chamber 5, thereby forming an integrated structure.

[0023] Furthermore, the sealing assembly 2 includes a U-shaped sealing cover 21 with an open end. The U-shaped sealing cover 21 is coaxial with the filter assembly 1 and the oil pump assembly 3. The open end of the U-shaped sealing cover 21 forms a positioning groove 22. The top end of the filter assembly 1 can be embedded into the positioning groove 22 to form a first oil chamber 4. The non-open end of the U-shaped sealing cover 21 can be sealed and connected to the bottom end of the oil pump assembly 3 to form a second oil chamber 5.

[0024] Specifically, the outer side of the U-shaped sealing cover 21 is fixed relative to the inner wall of the electric drive housing, and its open end faces the filter assembly 1. The side wall at the open end forms an annular positioning groove 22, which is connected to the annular filter assembly 1, so that the filter assembly 1 is fixed relative to the inner wall of the electric drive housing, thereby forming the first oil chamber 4. Secondly, the non-open end is the top of the U-shaped sealing cover 21, and the bottom end of the oil pump assembly 3 forms a cavity for placing the rotor circulation pump 33. This cavity and the top of the U-shaped sealing cover 21 form a detachable fixed connection, and the connection position is kept sealed, so that the cooling oil placed in the second oil chamber 5 will not leak from the connection position, thereby ensuring the sealing effect of the second oil chamber 5. Furthermore, the U-shaped sealing cover 21 is a single structural component, which is directly connected to the filter assembly 1 and the oil pump assembly 3 during the assembly and production process, reducing the assembly process of the U-shaped sealing cover 21 and the assembly process of the filter assembly 1 and the oil pump assembly 3, thereby reducing the contamination of the cooling oil by impurities.

[0025] Furthermore, the non-open end of the U-shaped sealing cover 21 forms an oil inlet passage 23 and an oil outlet passage 24 respectively; the oil inlet passage 23 is parallel to the axis of the filter assembly 1 or the oil pump assembly 3, and the oil inlet passage 23 passes through the non-open end of the U-shaped sealing cover 21 to connect the first oil chamber 4 and the second oil chamber 5. The oil inlet of the rotor circulation pump 33 placed inside the second oil chamber 5 is connected to the oil inlet passage 23; the oil outlet passage 24 is formed on the outside of the non-open end of the U-shaped sealing cover 21, and the oil outlet passage 24 can connect the second oil chamber 5 and the cooling oil circulation pipe 78. The oil outlet of the rotor circulation pump 33 is connected to the oil outlet passage 24.

[0026] Specifically, the axes of the filter assembly 1, the U-shaped sealing cap 21, and the oil pump assembly 3 coincide, and the axis of the main body of the oil inlet passage 23 is parallel to the axis of the U-shaped sealing cap 21, reducing the flow path of the cooling oil in the oil inlet passage 23 and thus improving the flow effect of the cooling oil. Secondly, the bottom end of the oil inlet passage 23 is connected to the internal cavity of the U-shaped sealing cap 21, and its top end is connected to the oil inlet of the rotor circulation pump 33 of the second oil chamber 5. The rotor circulation pump 33 changes its volume at the top end of the oil inlet passage 23 through meshing. A negative pressure is created, and the cooling oil placed in the first oil chamber 4 is drawn into the second oil chamber 5 through the oil inlet passage 23, thereby realizing the unidirectional flow of cooling oil from the first oil chamber 4 to the second oil chamber 5; secondly, the top end of the oil outlet passage 24 is connected to the oil outlet of the rotor circulation pump 33, and the oil outlet of the rotor circulation pump 33 forms high pressure, which forces the cooling oil into the oil outlet passage 24, and its bottom end is connected to the outer cooling oil circulation pipe 78, so that the high-pressure cooling oil flows into the cooling oil circulation pipe 78, providing power for the flow of cooling oil.

[0027] Furthermore, sealing rings 25 are connected to the outer side of the U-shaped sealing cover 21 and the outer side of the oil pump assembly 3. The U-shaped sealing cover 21, the oil pump assembly 3, the inner wall of the electric drive housing and the sealing rings 25 form a cooling oil circulation pipe 78. The sealing rings 25 connected to the outer side of the U-shaped sealing cover 21 can separate the oil outlet position of the oil pump assembly 3 and the oil inlet position of the filter assembly 1.

[0028] Specifically, two parallel sealing rings 25, from bottom to top, are respectively connected to the outer side of the opening end of the U-shaped sealing ring 25 and the outer side of the protruding position of the oil pump assembly 3. The protruding position of the oil pump assembly 3 refers to the connection position between the pump body 31 that houses the rotor circulation pump 33 and the pump body 31 that houses the power source 32 that drives the rotor circulation pump 33. The outer diameter of the pump body 31 that houses the rotor circulation pump 33 is smaller than the outer diameter of the pump body 31 that houses the power source 32 that drives the rotor circulation pump 33. The inner wall of the electric drive housing is connected to the outer side of the opening end of the U-shaped sealing ring 25 and the outer side of the protruding position of the oil pump assembly 3. There is a gap between the two parts, and the upper and lower sealing rings 25 seal the upper and lower parts of the gap, thereby forming a cooling oil circulation pipe 78, which is connected to the oil outlet 24; secondly, the upper part of the sealing ring 25 connected to the outer side of the opening end of the U-shaped sealing ring 25 is the cooling oil circulation pipe 78 connected to the oil outlet 24, and the lower part is the cooling oil circulation pipe 78 connected to the oil inlet 23, so that the sealing ring 25 can separate the circulating cooling oil, thereby ensuring that the cooling oil flowing into the first oil chamber 4 does not flow directly into the second oil chamber 5, and ensuring the circulation speed of the cooling oil.

[0029] Furthermore, the oil pump assembly 3 includes a power source 32 that drives the rotor circulation pump 33 to rotate. The power source 32 and the rotor circulation pump 33 are placed inside the pump body 31, and the outer side of the pump body 31 is in contact with the cooling oil circulation pipe 78.

[0030] Specifically, in this embodiment, the power source 32 is an electric motor, and the rotor circulation pump 33 includes an inner rotor and an outer rotor that mesh with each other. The electric motor drives the inner rotor to rotate, which in turn drives the outer rotor to rotate eccentrically, forming a second oil chamber 5 with a changing volume. This draws the cooling oil from the first oil chamber 4 and presses it into the cooling oil circulation pipe 78 through the oil outlet passage 24. The outer diameter of the pump body 31 where the power source 32 is placed is larger than the outer diameter of the pump body 31 where the rotor circulation pump 33 is placed. The outer side of the pump body 31 where the rotor circulation pump 33 is placed is in contact with the cooling oil circulation pipe 78, so that the cooling oil in the second oil chamber 5 is connected to it through the oil outlet passage 24. This ensures that the cooling oil can only flow unidirectionally from the first oil chamber 4 to the second oil chamber 5, and then to the cooling oil circulation pipe 78.

[0031] Furthermore, an enlarged hole is formed at the bottom end of the pump body 31, and the non-open end of the U-shaped sealing cover 21 is embedded in the enlarged hole to form a second oil chamber 5.

[0032] Specifically, the bottom end of the pump body 31 is an open end, and the rotor circulation pump 33 is placed inside it. The bottom end of the pump body 31 forms an enlarged hole, and the inner diameter of the enlarged hole is larger than the inner diameter of the bottom end. The outer side of the bottom end of the U-shaped sealing cover 21 is interference-fitted with the enlarged hole, so that the two are fixedly connected and the sealing effect of the second oil chamber 5 is guaranteed.

[0033] like Figure 3 As shown, the bottom end of the pump body 31 is bolted to the non-open end of the U-shaped sealing cover 21.

[0034] Another embodiment of the pump body 31 and the U-shaped sealing cover 21 is as follows: a threaded hole is formed at the bottom end of the pump body 31, and a mounting lug for the mounting bolt is formed at the top end of the U-shaped sealing cover 21. The U-shaped sealing cover 21 is fixedly connected to the bottom end of the pump body 31 by bolts, and the sealing effect of the second oil chamber 5 is ensured.

[0035] Furthermore, the filter assembly 1 includes an oil suction filter 11 for filtering cooling oil. The oil suction filter 11 has a central cylindrical structure. The bottom of the oil suction filter 11 is embedded with a lower end cap 12, and the top of the oil suction filter 11 is embedded with a positioning groove 22. The position where the oil suction filter 11 does not contact the lower end cap 12 or the positioning groove 22 is the oil inlet position of the first oil chamber 4.

[0036] Specifically, the oil suction filter 11 is a coarse filter component for coarse filtering of cooling oil before it enters the oil pump assembly 3; secondly, the top of the lower end cover 12 forms an annular groove, which can be embedded and fixed to the bottom of the oil suction filter 11, and the top of the oil suction filter 11 is embedded in an annular positioning groove 22. The positioning groove 22 is fixed to the electric drive housing by a U-shaped sealing cover 21, so that the oil suction filter 11 is fixed to the electric drive housing; there is a gap between the middle position of the oil suction filter 11 and the electric drive housing. The gap is part of the cooling oil circulation pipe 78. At the same time, the cooling oil passes through the oil suction filter 11 through the gap for filtration. The position through which it passes is the oil inlet position, and then enters the first oil chamber 4.

[0037] Example 2 This second embodiment is a speed reducer, which includes the cooling and lubrication device of the first embodiment. The cooling and lubrication device cools the internal heat dissipation parts of the speed reducer by circulating cooling oil.

[0038] Example 3 This third embodiment is an electric drive system, which includes the reducer of the second embodiment. The cooling and lubrication device ensures the flow speed in the reducer, thereby stabilizing the working temperature of the reducer and the working temperature of the electric drive system to ensure working efficiency.

[0039] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

[0040] The technologies, shapes, and structures not described in detail in this utility model are all known technologies.

Claims

1. A cooling and lubrication device, wherein the cooling and lubrication device is disposed inside an electric drive housing, characterized in that, The cooling and lubrication device also includes: Filter assembly (1) for filtering cooling oil; Oil pump assembly (3) for circulating cooling oil; and A sealing assembly (2) is disposed between the filter assembly (1) and the oil pump assembly (3). The bottom end of the sealing assembly (2) can fix the filter assembly (1) and form a first oil chamber (4) with the filter assembly (1). The top end of the sealing assembly (2) forms a second oil chamber (5) with the oil pump assembly (3). Cooling oil placed in the first oil chamber (4) can flow into the second oil chamber (5) in one direction through the sealing assembly (2). The filter assembly (1), the oil pump assembly (3) and the sealing assembly (2) are integrally assembled inside the electric drive housing.

2. The cooling and lubrication device according to claim 1, characterized in that: The sealing assembly (2) includes a U-shaped sealing cap (21) with an open end. The U-shaped sealing cap (21) is coaxial with the filter assembly (1) and the oil pump assembly (3). The open end of the U-shaped sealing cap (21) forms a positioning groove (22). The top end of the filter assembly (1) can be inserted into the positioning groove (22) to form the first oil chamber (4). The non-open end of the U-shaped sealing cap (21) can be sealed to the bottom end of the oil pump assembly (3) to form the second oil chamber (5).

3. The cooling and lubrication device according to claim 2, characterized in that: The non-opening ends of the U-shaped sealing cap (21) form an oil inlet passage (23) and an oil outlet passage (24), respectively; The oil inlet passage (23) is parallel to the axis of the filter assembly (1) or the oil pump assembly (3). The oil inlet passage (23) passes through the non-open end of the U-shaped sealing cover (21) to connect the first oil chamber (4) and the second oil chamber (5). The oil inlet of the rotor circulation pump (33) placed inside the second oil chamber (5) is connected to the oil inlet passage (23). The oil outlet passage (24) is formed on the outside of the non-open end of the U-shaped sealing cover (21). The oil outlet passage (24) can connect the second oil chamber (5) and the cooling oil circulation pipe (78). The oil outlet of the rotor circulation pump (33) is connected to the oil outlet passage (24).

4. The cooling and lubrication device according to claim 3, characterized in that: The outer side of the U-shaped sealing cover (21) and the outer side of the oil pump assembly (3) are both connected to sealing rings (25). The U-shaped sealing cover (21), the oil pump assembly (3), the inner wall of the electric drive housing and the sealing rings (25) form the cooling oil circulation pipe (78). The sealing ring (25) connected to the outside of the U-shaped sealing cap (21) can separate the oil outlet position of the oil pump assembly (3) and the oil inlet position of the filter assembly (1).

5. The cooling and lubrication device according to claim 3, characterized in that: The oil pump assembly (3) includes a power source (32) that drives the rotor circulation pump (33) to rotate. The power source (32) and the rotor circulation pump (33) are placed inside the pump body (31), and the outside of the pump body (31) is in contact with the cooling oil circulation pipe (78).

6. The cooling and lubrication device according to claim 5, characterized in that: The bottom end of the pump body (31) forms an enlarged hole, and the non-open end of the U-shaped sealing cover (21) is embedded in the enlarged hole to form the second oil chamber (5).

7. The cooling and lubrication device according to claim 5, characterized in that: The bottom end of the pump body (31) is bolted to the non-open end of the U-shaped sealing cover (21).

8. The cooling and lubrication device according to claim 2, characterized in that: The filter assembly (1) includes an oil suction filter (11) for filtering cooling oil. The oil suction filter (11) has a central cylindrical structure. The bottom of the oil suction filter (11) is embedded with a lower end cap (12), and the top of the oil suction filter (11) is embedded with the positioning groove (22). The position where the oil suction filter (11) does not contact the lower end cap (12) or the positioning groove (22) is the oil inlet position of the first oil chamber (4).

9. A speed reducer, characterized in that, Includes the cooling and lubrication device as described in any one of claims 1 to 8.

10. An electric drive system, characterized in that, Includes the speed reducer as described in claim 9.

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