Active lubricating oil passage of oil-cooled electric drive system housing, its oil quantity regulation method and product

Abstract

The active lubricating oil passage of the oil-cooled electric drive system housing includes an oil passage opened on the oil-cooled electric drive system housing. The oil passage is connected to both the motor bearing hole and the gear bearing hole on the oil-cooled electric drive system housing. The inner end of the oil passage is docked with an oil pump inside the oil-cooled electric drive system housing. It is characterized in that: an elastic movable valve group one for controlling the lubricating oil quantity of the motor bearing hole and an elastic movable valve group two for controlling the lubricating oil quantity of the gear bearing hole are installed on the oil passage. Both the elastic movable valve group one and the elastic movable valve group two are opened as the oil pressure in the oil passage increases, connecting the oil passage with the motor bearing hole and the oil passage with the gear bearing hole. The present invention realizes precise control of the lubricating oil quantity flowing to the motor and the bearing, forms active quantitative lubrication, provides more oil for the active cooling of the motor while meeting the lubrication requirement, improves the utilization rate of the lubricating oil, is easy to maintain, and is economical and practical. The present invention also provides an oil-cooled electric drive system housing and a method for adjusting the oil quantity of the active lubricating oil passage of the oil-cooled electric drive system housing.

Description

Technical Field

[0001] The present invention relates to an active lubricating oil passage for an oil-cooled electric drive system housing and a method for regulating the oil quantity thereof, belonging to the technical field of lubrication of electric drive systems. The present invention also relates to an oil-cooled electric drive system housing. Background Art

[0002] Currently, the combination of a motor, a reducer, and a controller used in pure electric vehicles is collectively referred to as an electric drive system or an electric drive assembly. With the development of technology, the current speed requirement of the electric drive system has become higher. In order to ensure its efficiency, service life, NVH performance, etc., the motor oil-cooling method has gradually replaced the previous air-cooling or water-cooling method. In order to improve the overall efficiency, volume, etc. of the electric drive system, the oil for motor oil-cooling and the oil for gear lubrication are shared to form an oil-cooled electric drive system.

[0003] Currently, the oil-cooled electric drive system mainly realizes the active cooling of the motor through an electronic oil pump and the lubrication of the gear and shaft system through gear oil agitation. There are also a few manufacturers that realize the active cooling of the motor and the active lubrication of the gear and shaft system through an active oil pump. Moreover, with the increase in speed and load, it has become increasingly difficult to meet the lubrication requirements of the bearing system through gear oil agitation. Therefore, the active lubrication based on an oil pump has increasingly become the future development trend. For the active lubrication based on an oil pump, in order to ensure the synchronous realization of active cooling and active lubrication, it is necessary to precisely control the lubricating oil flow rate flowing to the motor and the bearing. The electric drive system with active lubrication will arrange oil passages on the housing. After the housing is die-cast, the oil passages are formed by drilling holes to form ports, and then the oil passage ports are sealed with plugs to form a complete oil passage. In order to precisely control the lubricating oil flow rate flowing to the motor and the bearing, it is necessary to respectively control the lubricating oil flow rate flowing to the motor and the bearing through multiple oil pumps, or install a check valve in the housing to control the lubricating oil flow rate flowing to the motor and the bearing, or realize the flow control through a hydraulic control system based on a built-in valve plate. However, the above methods are all complex in structure, expensive in cost and difficult to maintain, and the plug has a single function and is only used to seal the oil passage processing hole. Summary of the Invention

[0004] The active lubricating oil passage for the oil-cooled electric drive system housing and the method for regulating the oil quantity provided by the present invention can precisely control the lubricating oil quantity flowing to the motor and the bearing, form active quantitative lubrication, reduce the oil consumption of active lubrication, provide more oil for the active cooling of the motor while meeting the lubrication requirement, improve the utilization rate of the lubricating oil, and only need to process the oil passage when installing the elastic movable valve group, and only the inner end of the oil passage is butted against the oil pump. The oil hydraulic structure is simple, easy to maintain, economical and practical. The present invention provides an oil-cooled electric drive system housing.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] The active lubricating oil passage of the oil-cooled electric drive system housing includes an oil passage opened on the oil-cooled electric drive system housing. The oil passage is connected to both the motor bearing hole and the gear bearing hole on the oil-cooled electric drive system housing. The inner end of the oil passage is docked with an oil pump inside the oil-cooled electric drive system housing. It is characterized in that: an elastic movable valve group one for controlling the lubricating oil quantity of the motor bearing hole and an elastic movable valve group two for controlling the lubricating oil quantity of the gear bearing hole are installed on the oil passage. Both the elastic movable valve group one and the elastic movable valve group two are opened as the oil pressure in the oil passage increases, connecting the oil passage with the motor bearing hole and the oil passage with the gear bearing hole.

[0007] Preferably, the oil passage includes a main oil passage, an end branch oil passage connecting the outer end of the main oil passage with the motor bearing hole, and an inner branch oil passage connecting the main oil passage with the gear bearing hole. The elastic movable valve group one is installed in the end branch oil passage and seals the outer end of the main oil passage. The elastic movable valve group two is installed in the inner branch oil passage, and the inner end of the main oil passage is docked with the oil pump.

[0008] Preferably, the end branch oil passage is in an L shape and is composed of an installation passage aligned and connected with the main oil passage and a connection passage connected with the motor bearing hole. The elastic movable valve group one is installed in the installation passage to seal the installation passage and disconnect the main oil passage and the connection passage. The elastic movable valve group one is opened as the oil pressure increases to connect the main oil passage and the connection passage.

[0009] Preferably, the elastic movable valve group one includes a valve seat installed in the installation passage, a valve core arranged in the valve seat, a spring pressing the valve core, and an adjustable valve body installed in the valve seat and pressing on the spring. An oil passing hole connected to the main oil passage is opened on the valve seat. The valve core closes the oil passing hole. The valve core moves in the valve seat as the oil pressure increases to compress the spring and open the oil passing hole, connecting the main oil passage and the connection passage.

[0010] Preferably, the inner branch oil passage has the same structure as the end branch oil passage. The inner branch oil passage is composed of an installation passage aligned and connected with the main oil passage and a connection passage connected with the gear bearing hole. The elastic movable valve group two is installed in the installation passage to seal the installation passage and disconnect the main oil passage and the connection passage. The elastic movable valve group two is opened as the oil pressure increases to connect the main oil passage and the connection passage.

[0011] Preferably, the elastic movable valve group two has the same structure as the elastic movable valve group one. The adjustable valve body is in threaded fit with the inner wall of the valve seat, and a sealing ring in sealing contact with the adjustable valve body is arranged in the valve seat. The valve core is in guiding fit with the adjustable valve body. The valve seat is screwed into the installation passage in a threaded fit, and a sealing ring is sleeved on the valve seat. The sealing ring is pressed on the end face of the installation passage to seal the installation passage.

[0012] Preferably, the oil passage includes a bottom oil hole formed at the bottom of the valve seat and coaxially aligned with the valve core, and a middle oil hole penetrating through the middle of the valve seat in the radial direction. The bottom surface of the valve core abuts against the bottom of the valve seat to close the bottom oil hole and the middle oil hole. The bottom surface of the valve core is an outward convex arc surface. As the oil pressure increases, the valve core moves towards the adjustable valve body to open the bottom oil hole and the middle oil hole.

[0013] An oil-cooled electric drive system housing, in which a lubricating oil passage is formed. It is characterized in that: the lubricating oil passage is the active lubricating oil passage of the oil-cooled electric drive system housing described above.

[0014] The oil quantity adjustment method of the active lubricating oil passage of the oil-cooled electric drive system housing described above is characterized in that: according to the lubrication requirements of the motor bearings in the oil-cooled electric drive system housing, the initial elastic force of the first elastic movable valve group is adjusted to control the lubricating oil quantity of the motor bearing holes; according to the lubrication requirements of the gear bearings in the oil-cooled electric drive system housing, the initial elastic force of the second elastic movable valve group is adjusted to control the lubricating oil quantity of the gear bearing holes.

[0015] Preferably, the thread in the threaded fit between the adjustable valve body and the inner wall of the valve seat is designed as a standard thread with both the thread length and the pitch calibrated. The thread advance amount of the adjustable valve body in the inner wall of the valve seat is adjusted to adjust the initial compression amount of the spring, so as to respectively adjust the initial elastic forces of the first elastic movable valve group and the second elastic movable valve group.

[0016] The beneficial effects of the present invention are:

[0017] 1. The active lubricating oil passage of the oil-cooled electric drive system housing of the present invention is provided with an elastic movable valve group I and an elastic movable valve group II. The oil pump inputs lubricating oil into the oil passage. The oil pressure in the oil passage rises to push the elastic movable valve group I and the elastic movable valve group II to open, connecting the oil passage with the motor bearing hole and the oil passage with the gear bearing hole, and guiding the lubricating oil into the motor bearing hole and the gear bearing hole. Only when the oil pressure in the oil passage reaches the opening pressure required by the elastic movable valve group I or the elastic movable valve group II, the elastic movable valve group I or the elastic movable valve group II will be opened. The amount of oil flowing into the motor bearing hole is controlled by the elastic movable valve group I, and the amount of oil flowing into the gear bearing hole is controlled by the elastic movable valve group II. During assembly, according to the lubrication requirements of the motor and the bearing, the initial elastic force of the elastic movable valve group I and the elastic movable valve group II is adjusted. During operation, the oil pressure in the oil passage is controlled by the oil pump to control the opening of the elastic movable valve group I and the elastic movable valve group II, ensuring that the oil flowing into the motor bearing hole and the gear bearing hole can meet the lubrication requirements of the motor and the bearing, realizing precise control of the lubricating oil amount flowing into the motor and the bearing, forming active quantitative lubrication, reducing the amount of lubricating oil used for active lubrication, providing more oil for the active cooling of the motor while meeting the lubrication requirements, improving the utilization rate of the lubricating oil. Installing the elastic movable valve group only requires machining the oil passage, and only the inner end of the oil passage is connected to the oil pump. The oil power structure is simple, easy to maintain, and economical and practical.

[0018] 2. The elastic movable valve group I seals the outer end of the main oil passage and opens the coupling main oil passage and the coupling passage as the oil pressure increases. The elastic movable valve group I serves as both the plug at the outer end of the main oil passage and the valve for controlling the amount of oil flowing into the motor bearing hole, simplifying the structure of the oil passage. The outer end of the main oil passage is arranged at the branch oil passage at the end connected to the motor bearing hole, shortening the length of the oil passage between the outer end of the oil passage and the motor bearing hole, reducing both the amount of lubricating oil used for active lubrication and facilitating the installation and maintenance of the elastic movable valve group I.

[0019] 3. The elastic movable valve group I and the elastic movable valve group II have the same structure. They are positioned by the valve seat. The adjustable valve body is threadedly engaged with the valve seat to compress the spring. The spring compresses the valve core, and the valve core closes the oil passage hole. By adjusting the position of the adjustable valve body in the valve seat, the initial compression amount of the spring can be adjusted, thereby adjusting the initial elastic force, realizing the separate adjustment of the initial elastic forces of the elastic movable valve group I and the elastic movable valve group II, and achieving the separate control of the amount of oil flowing into the motor bearing hole and the gear bearing hole. Description of the Drawings

[0020] Figure 1 It is a schematic diagram of the active lubricating oil passage of the oil-cooled electric drive system housing in the specific embodiment on the oil-cooled electric drive system housing.

[0021] Figure 2 It is a schematic diagram of the installation of the elastic movable valve group I or the elastic movable valve group II on the oil passage.

[0022] Figure 3 It is a distribution schematic diagram of the connection between the main oil passage and the end branch oil passage or the inner branch oil passage.

[0023] Figure 4 It is a schematic diagram of the elastic movable valve group I. Specific embodiments

[0024] The following combines Figures 1 to 4 to make a detailed description of the embodiments of the present invention.

[0025] The active lubricating oil passage of the oil-cooled electric drive system housing includes an oil passage 1 opened on the oil-cooled electric drive system housing 100. The oil passage 1 is connected to both the motor bearing hole 2 and the gear bearing hole 3 on the oil-cooled electric drive system housing. The inner end of the oil passage 1 is butted against a oil pump 4 inside the oil-cooled electric drive system housing. It is characterized in that: an elastic movable valve group I 5 for controlling the lubricating oil quantity of the motor bearing hole 2 and an elastic movable valve group II 6 for controlling the lubricating oil quantity of the gear bearing hole 3 are installed on the oil passage 1. Both the elastic movable valve group I 5 and the elastic movable valve group II 6 are opened as the oil pressure in the oil passage increases, connecting the oil passage 1 with the motor bearing hole 2 and the oil passage 1 with the gear bearing hole 3.

[0026] For the above-mentioned active lubricating oil passage of the oil-cooled electric drive system housing, the elastic movable valve group I 5 and the elastic movable valve group II 6 are installed on the oil passage 1. The oil pump 4 inputs lubricating oil into the oil passage 1. The rising oil pressure in the oil passage 1 pushes the elastic movable valve group I 5 and the elastic movable valve group II 6 to open, connecting the oil passage 1 with the motor bearing hole 2 and the oil passage 1 with the gear bearing hole 3, and guiding the lubricating oil into the motor bearing hole 2 and the gear bearing hole 3. Only when the oil pressure in the oil passage 1 reaches the opening pressure required by the elastic movable valve group I 5 or the elastic movable valve group II 6 will the elastic movable valve group I 5 or the elastic movable valve group II 6 be opened. The oil quantity flowing to the motor bearing hole 2 is controlled by the elastic movable valve group I 5, and the oil quantity flowing into the gear bearing hole 3 is controlled by the elastic movable valve group II 6. During assembly, the initial elastic forces of the elastic movable valve group I 5 and the elastic movable valve group II 6 are adjusted according to the lubrication requirements of the motor and the bearing. During operation, the oil pressure in the oil passage is controlled by the oil pump 4 to control the opening of the elastic movable valve group I 5 and the elastic movable valve group II 6, ensuring that the oil flowing to the motor bearing hole 2 and the gear bearing hole 3 can meet the lubrication requirements of the motor and the bearing, realizing precise control of the lubricating oil quantity flowing to the motor and the bearing, forming active quantitative lubrication, reducing the oil consumption of active lubrication, providing more oil for the active cooling of the motor while meeting the lubrication, improving the utilization rate of the lubricating oil. Installing the elastic movable valve group only requires processing the oil passage, and only the inner end of the oil passage 1 is butted against the oil pump 4. The oil hydraulic structure is simple, easy to maintain, economical and practical.

[0027] Among them, the oil passage 1 includes a main oil passage 7, an end branch oil passage 8 connecting the outer end of the main oil passage 7 and the motor bearing hole 2, and an inner branch oil passage 9 connecting the main oil passage 1 and the gear bearing hole 3. The elastic movable valve group 5 is installed in the end branch oil passage 8 and seals the outer end of the main oil passage 7. The elastic movable valve group 6 is installed in the inner branch oil passage 9, and the inner end of the main oil passage 7 is docked with the oil pump 4. The inner end of the main oil passage 7 is docked with the oil pump 4 for the input of lubricating oil. The outer end is sealed by the elastic movable valve group 5. The elastic movable valve group 5 serves as both the plug at the outer end of the main oil passage 7 and the valve for controlling the oil volume flowing into the motor bearing hole 2, simplifying the structure of the oil passage. The outer end of the main oil passage 1 is arranged at the end branch oil passage 8 connected to the motor bearing hole 2, shortening the oil passage length between the outer end of the oil passage and the motor bearing hole 2, which not only reduces the amount of lubricating oil for active lubrication but also facilitates the installation and maintenance of the elastic movable valve group 5. Installing the elastic movable valve group 6 in the inner branch oil passage 9 ensures that the elastic movable valve group 6 does not obstruct the oil flow in the main oil passage, making the oil pressure in the main oil passage 7 equal. By adjusting the oil pressure in the main oil passage 7, the initial elastic force of the elastic movable valve group 5, and the initial elastic force of the elastic movable valve group 6, the elastic movable valve group 5 and the elastic movable valve group 6 can be opened respectively according to their respective initial elastic forces to meet the different oil requirements of the motor bearing hole 2 and the gear bearing hole 3.

[0028] Among them, the end branch oil passage 8 is L-shaped and consists of an installation passage 81 aligned and connected with the main oil passage 7 and a connection passage 82 connected to the motor bearing hole 2. The elastic movable valve group 5 is installed in the installation passage 81 to seal the installation passage 81 and disconnect the main oil passage 7 and the connection passage 82. The elastic movable valve group 5 opens and connects the main oil passage 7 and the connection passage 82 as the oil pressure increases. The installation passage 81 is aligned and connected with the main oil passage 7, and the connection passage 82 is perpendicular to the installation passage 81 to form the L-shaped end branch oil passage 8. The elastic movable valve group 5 is installed in the installation passage 81 to seal the outer end of the main oil passage 7 and at the same time disconnect the oil flow between the main oil passage 7 and the connection passage 82. When the elastic movable valve group 5 opens, it connects the main oil passage 7 and the connection passage 82, and the oil flows from the main oil passage 7 through the connection passage 82 to the motor bearing hole 2 to lubricate the motor. The elastic movable valve group 5 not only serves as the plug at the outer end of the main oil passage 7 but also serves as the valve for controlling the on-off of the main oil passage 7 and the connection passage 82, eliminating the need to use a plug to seal the outer end of the main oil passage 7, which not only shortens the path of the active lubricating oil passage but also reduces the structure of the active lubricating oil passage.

[0029] Among them, the elastic movable valve group 5 includes a valve seat 10 installed in the installation passage 81, a valve core 11 arranged in the valve seat 10, a spring 12 pressing the valve core 11, and an adjustable valve body 13 installed in the valve seat 10 and pressing on the spring 12. An oil passage hole 101 communicating with the main oil passage 7 is opened on the valve seat 10. The valve core 11 closes the oil passage hole 101. As the oil pressure increases, the valve core 11 moves in the valve seat 10 to compress the spring 12 and open the oil passage hole 101, connecting the main oil passage 7 and the connection passage 82. The adjustable valve body 13 is installed in the valve seat 10 to press the spring 12, and the spring 12 presses the valve core 11 to keep the valve core from closing the oil passage hole 101. When the oil pressure is less than or equal to the elastic force of the spring 12, the valve core 11 remains stationary, and the elastic movable valve group 5 remains in the closed state. When the oil pressure is greater than the elastic force of the spring 12, the valve core 11 moves towards the adjustable valve body 13 to open the oil passage hole 101, connecting the main oil passage 7 and the connection passage 82, and guiding the oil to the motor bearing hole 2 for lubricating the motor. By adjusting the initial compression amount of the spring 12, the elastic force of the spring 12 is adjusted, that is, the initial elastic force of the elastic movable valve group 5 is adjusted, thereby controlling the amount of lubricating oil flowing to the motor bearing hole 2.

[0030] Among them, the inner branch oil passage 9 has the same structure as the end branch oil passage 8. The inner branch oil passage 9 is composed of an installation passage 81 aligned and communicating with the main oil passage 7 and a connection passage 82 communicating with the gear bearing hole 2. The elastic movable valve group 6 is installed in the installation passage to seal the installation passage 81 and disconnect the main oil passage 7 and the connection passage 82. The elastic movable valve group 6 is opened as the oil pressure increases to connect the main oil passage 7 and the connection passage 82. The elastic movable valve group 6 is installed in the installation passage 81 of the inner branch oil passage 9 to disconnect the flow of the oil in the connection passage 82 of the inner branch oil passage 9 and does not obstruct the flow of the oil in the main oil passage 7. When the oil pressure in the main oil passage 7 increases, it pushes the elastic movable valve group 6 to open, allowing the oil to flow through the connection passage 82 to the gear bearing hole 3 to meet the lubrication requirements of the bearing.

[0031] Among them, the structure of the elastic movable valve group two 6 is the same as that of the elastic movable valve group one 5. The adjustable valve body 13 is in threaded fit with the inner wall of the valve seat 10, and a sealing ring 14 in sealing contact with the adjustable valve body 13 is arranged in the valve seat 10. The valve core 11 is in guiding fit with the adjustable valve body 13. The valve seat 10 is screwed into the installation channel 81 by thread, and a sealing ring 14 is sleeved on the valve seat 10. The sealing ring 14 is pressed against the end face of the installation channel 81 to seal the installation channel. The adjustable valve body 13 can rotate in the valve seat 10 to adjust the position, so as to adjust the initial compression amount of the spring 12. The valve core 11 is in guiding fit with the adjustable valve body 13. When the valve core 11 is pushed by the oil fluid, it will move in a guiding manner on the adjustable valve body 13 to ensure the reliability of the opening of the oil passing hole 101. The sealing ring 14 between the valve seat 10 and the adjustable valve body 13 prevents the oil fluid from leaking out between the two, ensuring that the increased oil pressure can push the valve core 11 to move. The valve seat 11 is screwed into the installation channel 81 by thread, and a sealing ring 14 is sleeved on the valve seat 11. The sealing ring 14 is pressed against the end face of the installation channel 81 to seal the installation channel 81. The valve seat 10 is convenient to install, and the installation channel 81 is sealed by screwing the valve seat 10 tightly to press the sealing ring 14, ensuring the sealing feasibility of the elastic adjustable valve group one 5 at the outer end of the main oil channel 7, and the feasibility of the elastic adjustable valve group one 5 and the elastic adjustable valve group two 6 to be opened by the oil fluid. The structure of the elastic movable valve group two 6 is the same as that of the elastic movable valve group one 5, so that the opening and closing movement modes of the two are the same. Since the required lubricating oil amounts for the gear bearing hole 3 and the electric shaft bearing hole 2 are different, the initial compression amount of the spring 12 in the elastic movable valve group two 6 is different from that of the spring 12 in the elastic movable valve group one 5, and the initial elastic force of the elastic movable valve group two 6 is different from that of the elastic movable valve group one 5, so that the two are opened successively to meet the different lubricating oil amount requirements of the motor bearing hole 2 and the gear bearing hole 3.

[0032] Among them, the oil passing hole 101 includes a bottom oil hole 102 opened at the bottom of the valve seat 10 and coaxially aligned with the valve core 11 and a middle oil hole 103 penetrating through the middle of the valve seat 10 in the radial direction. The bottom surface of the valve core 11 abuts against the bottom of the valve seat 10 to close the bottom oil hole 102 and the middle oil hole 103, and the bottom surface of the valve core 11 is an outward convex arc surface. When the oil pressure increases, the valve core 11 moves towards the adjustable valve body 13 to open the bottom oil hole 102 and the middle oil hole 103. As can be seen from the attached drawings, when the oil pressure increases, the oil fluid enters from the bottom oil hole 102, pushes the valve core 11 to move in a guiding manner towards the adjustable valve body 13 and compresses the spring, opens the bottom oil hole 102 and the middle oil hole 103, connects the main oil channel 7 and the connecting channel 82, and guides the oil fluid into the motor bearing hole 2 and the gear bearing hole 3. As Figure 1As shown in the figure, the main oil passage 7 is a bent oil passage with a corner on the oil-cooled electric drive system housing. The end branch oil passage 8 is opened at the outer end of the main oil passage 8. The valve seat in the elastic adjustable valve group 5 is threadedly fitted and installed in the installation passage 81 of the end branch oil passage 8. The inner branch oil passage 9 is opened at the corner position of the main oil passage 7. The valve seat of the elastic adjustable valve group 6 is threadedly fitted and installed in the installation passage 81 of the inner branch oil passage 9. Corresponding counterbores A are opened on the oil-cooled electric drive system housing at the installation passage 81 of the end branch oil passage 8 to facilitate the screwing in of the valve seat 10 and the adjustment of the adjustable valve body 11. Corresponding counterbores A are also opened on the oil-cooled electric drive system housing at the installation passage 81 of the inner branch oil passage 9 to facilitate the screwing in of the valve seat 10 and the adjustment of the adjustable valve body 11.

[0033] The present invention also protects an oil-cooled electric drive system housing. A lubricating oil passage is opened in the oil-cooled electric drive system housing 100. It is characterized in that: the lubricating oil passage is the above-mentioned active lubricating oil passage of the oil-cooled electric drive system housing. The above-mentioned drive housing ensures that the oil flowing to the motor bearing hole 2 and the gear bearing hole 3 can meet the lubrication requirements of the motor and the bearings, realizes precise control of the lubricating oil quantity flowing to the motor and the bearings, forms active quantitative lubrication, reduces the oil consumption of active lubrication, provides more oil for the active cooling of the motor while meeting the lubrication, improves the utilization rate of the lubricating oil. Installing the elastic movable valve group only requires processing the oil passage, and only the inner end of the oil passage 1 is connected to the oil pump 4. The oil hydraulic structure is simple, easy to maintain, economical and practical.

[0034] The present invention also protects an oil quantity adjustment method for the above-mentioned active lubricating oil passage of the oil-cooled electric drive system housing. It is characterized in that: according to the lubrication requirements of the motor bearings in the oil-cooled electric drive system housing, the initial elastic force of the elastic movable valve group 5 is adjusted to control the lubricating oil quantity of the motor bearing hole 2. According to the lubrication requirements of the gear bearings in the oil-cooled electric drive system housing, the initial elastic force of the elastic movable valve group 6 is adjusted to control the lubricating oil quantity of the gear bearing hole 3. Adjust the initial elastic forces of the elastic movable valve group 5 and the elastic movable valve group 6. During operation, the oil pressure in the oil passage is controlled by the oil pump 4 to control the opening of the elastic movable valve group 5 and the elastic movable valve group 6, ensuring that the oil flowing to the motor bearing hole 2 and the gear bearing hole 3 can meet the lubrication requirements of the motor and the bearings, realizing precise control of the lubricating oil quantity flowing to the motor and the bearings, forming active quantitative lubrication. The initial elastic force of the elastic movable valve group 6 and the initial elastic force of the elastic movable valve group 5 are adjusted separately. The different initial elastic forces of the two cause them to open successively, meeting the different lubricating oil quantity requirements of the motor bearing hole 2 and the gear bearing hole 3, and ensuring that the oil flowing to the motor bearing hole and the gear bearing hole can meet the lubrication requirements of the motor and the bearings, realizing precise control of the lubricating oil quantity flowing to the motor and the bearings.

[0035] Among them, the thread in the threaded fit between the adjustable valve body 13 and the inner wall of the valve seat 10 is designed as a standard thread with both the thread length and the pitch calibrated. By adjusting the thread advancement amount of the adjustable valve body 13 in the inner wall of the valve seat 10, the initial compression amount of the spring 12 is adjusted, so as to respectively adjust the initial elastic force of the first elastic movable valve group 5 and the second elastic movable valve group 6. Adjusting the thread advancement amount of the adjustable valve body 13 to adjust the initial compression amount of the spring 12, thereby adjusting the elastic force of the spring 12, that is, adjusting the initial elastic force of the first elastic movable valve group 5 and the second elastic movable valve group 6. Only when the oil pressure is greater than the initial elastic force will the valve core 11 move and the valve group will open, thereby controlling the lubricating oil amount flowing to the motor bearing hole 2 and the gear bearing hole 3. Since the required lubricating oil amounts for the gear bearing hole 3 and the electric shaft bearing hole 2 are different, the initial compression amount of the spring 12 in the second elastic movable valve group 6 is different from that of the spring 12 in the first elastic movable valve group 5, and the initial elastic force of the second elastic movable valve group 6 is different from that of the first elastic movable valve group 5. The two open successively to meet the different lubricating oil amount requirements of the motor bearing hole 2 and the gear bearing hole 3.

[0036] The technical solutions of the embodiments of the present invention are completely described above in conjunction with the accompanying drawings. It should be noted that the described embodiments are only a part of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts fall within the protection scope of the present invention.

Claims

1. Oil quantity adjustment method for the active lubricating oil passage of the oil-cooled electric drive system housing The active lubricating oil passage of the oil-cooled electric drive system housing includes an oil passage opened on the oil-cooled electric drive system housing. The oil passage is connected to both the motor bearing hole and the gear bearing hole on the oil-cooled electric drive system housing. The inner end of the oil passage is docked with the oil pump inside the oil-cooled electric drive system housing. An elastic movable valve group one for controlling the lubricating oil quantity of the motor bearing hole and an elastic movable valve group two for controlling the lubricating oil quantity of the gear bearing hole are installed on the oil passage. Both the elastic movable valve group one and the elastic movable valve group two are opened as the oil pressure in the oil passage increases, connecting the oil passage with the motor bearing hole and the oil passage with the gear bearing hole The oil passage includes a main oil passage, an end branch oil passage connecting the outer end of the main oil passage with the motor bearing hole, and an inner branch oil passage connecting the main oil passage with the gear bearing hole. The elastic movable valve group one is installed in the end branch oil passage and seals the outer end of the main oil passage. The elastic movable valve group two is installed in the inner branch oil passage, and the inner end of the main oil passage is docked with the oil pump The end branch oil passage is in an L shape and consists of an installation passage aligned and connected with the main oil passage and a connection passage connected with the motor bearing hole. The elastic movable valve group one is installed in the installation passage to seal the installation passage and disconnect the main oil passage and the connection passage. The elastic movable valve group one is opened as the oil pressure increases to connect the main oil passage and the connection passage The inner branch oil passage has the same structure as the end branch oil passage. The inner branch oil passage consists of an installation passage aligned and connected with the main oil passage and a connection passage connected with the gear bearing hole. The elastic movable valve group two is installed in the installation passage to seal the installation passage and disconnect the main oil passage and the connection passage. The elastic movable valve group two is opened as the oil pressure increases to connect the main oil passage and the connection passage It is characterized in that According to the lubrication requirements of the motor bearing in the oil-cooled electric drive system housing, adjust the initial elastic force of the elastic movable valve group one to control the lubricating oil quantity of the motor bearing hole. According to the lubrication requirements of the gear bearing in the oil-cooled electric drive system housing, adjust the initial elastic force of the elastic movable valve group two to control the lubricating oil quantity of the gear bearing hole 2. The oil quantity adjustment method for the active lubricating oil passage of the oil-cooled electric drive system housing according to claim 1 It is characterized in that The elastic movable valve group one includes a valve seat installed in the installation passage, a valve core arranged in the valve seat, a spring pressing the valve core, and an adjustable valve body installed in the valve seat and pressing on the spring. An oil passing hole connected to the main oil passage is opened on the valve seat. The valve core closes the oil passing hole. The valve core moves in the valve seat as the oil pressure increases, compressing the spring and opening the oil passing hole to connect the main oil passage and the connection passage 3. The oil quantity adjustment method for the active lubricating oil passage of the oil-cooled electric drive system housing according to claim 2 It is characterized in that The elastic movable valve group two has the same structure as the elastic movable valve group one. The adjustable valve body is in threaded cooperation with the inner wall of the valve seat, and a sealing ring in sealing contact with the adjustable valve body is arranged in the valve seat. The valve core is in guiding cooperation with the adjustable valve body. The valve seat is screwed into the installation passage in threaded cooperation, and a sealing ring is sleeved on the valve seat. The sealing ring is pressed on the end face of the installation passage to seal the installation passage 4. The oil quantity adjustment method for the active lubricating oil passage of the oil-cooled electric drive system housing according to claim 3 It is characterized in that The oil passing hole described above includes a bottom oil hole opened at the bottom of the valve seat and coaxially aligned with the valve core, and a middle oil hole penetrating through the middle of the valve seat in the radial direction. The bottom surface of the valve core abuts against the bottom of the valve seat to close the bottom oil hole and the middle oil hole, and the bottom surface of the valve core is a convex arc surface. As the oil pressure increases, the valve core moves towards the adjustable valve body to open the bottom oil hole and the middle oil hole.

5. The method for adjusting the oil quantity of the active lubricating oil passage of the oil-cooled electric drive system housing according to claim 1, characterized in that: The thread in the threaded fit between the adjustable valve body and the inner wall of the valve seat is designed as a standard thread with both the thread length and the pitch calibrated. By adjusting the amount of thread advancement of the adjustable valve body in the inner wall of the valve seat, the initial compression amount of the spring is adjusted, so as to respectively adjust the initial elastic forces of the first elastic movable valve group and the second elastic movable valve group.

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