A powertrain and electric vehicle with integrated oil plugs

Abstract

A power assembly and electric vehicle with integrated oil plug, the housing of the power assembly comprises a through hole and an integrated oil plug, the through hole is communicated inside and outside of the housing, the integrated oil plug passes through the through hole, the hole wall of the through hole comprises a liquid outlet hole, the integrated oil plug comprises a threaded section and a ring-shaped piece, wherein: the threaded section extends into the through hole and engages the through hole, one end of the ring-shaped piece is connected with one end of the threaded section in axial end face, the other end of the ring-shaped piece extends into the shaft hole of the transmission shaft; the side wall of the ring-shaped piece comprises an oil hole, the inner cavity of the ring-shaped piece and the axial end face of the threaded section enclose a groove, the oil hole is communicated with the liquid outlet hole and the groove, the groove slot is located at the other end of the ring-shaped piece, the groove cavity accommodates a valve, the valve adjusts the flow of the coolant. The integrated oil plug changes the opening of the valve to accurately control the flow of the coolant, so that the effective utilization of the coolant under different operating conditions can be realized, and the integrated oil plug meets the dual functions of sealing and plugging the through hole and oil delivery to the transmission shaft under different temperatures.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric vehicles, in particular to a power assembly with an integrated oil plug and an electric vehicle. BACKGROUND

[0002] A valve is arranged in an oil passage of the power assembly, which can accurately control the flow of the coolant to improve the heat dissipation efficiency of the heat generating components in the power assembly. However, the installation of the valve in the main oil passage leads to a complex structure and an increased volume of the power assembly, and there are problems such as a large number of parts and difficult assembly. SUMMARY

[0003] The present application provides a power assembly with an integrated oil plug, the housing of the power assembly includes a through hole for communicating the inside and outside of the housing along the axial direction of the power assembly, and an integrated oil plug for penetrating the through hole, the hole wall of the through hole includes an outlet hole, and the integrated oil plug includes a threaded segment and an annular piece, wherein: the threaded segment is used to extend into the through hole and engage the internal thread of the through hole, one end of the annular piece and one end of the threaded segment are connected by an axial end face, and the other end of the annular piece is used to extend into the shaft hole of a transmission shaft in the power assembly; the side wall of the annular piece includes an oil hole, the inner cavity of the annular piece and the axial end face of the threaded segment enclose a groove, the oil hole is used to communicate the outlet hole and the groove along the radial direction of the annular piece, the groove opening is located at the other end of the annular piece, and the groove cavity is used to accommodate a valve, and the valve is used to adjust the flow of the coolant in the integrated oil plug.

[0004] The present application integrates the threaded segment, the annular piece and the valve into an integrated oil plug with an integrated structure, which only needs to be screwed into the through hole during assembly to realize the sealing of the through hole and the communication between the internal flow passage and the oil passage of the transmission shaft, without the need to assemble multiple components, which is beneficial to reduce the processing cost of the power assembly and improve the assembly efficiency, and is more conducive to maintenance and replacement of components. By changing the opening of the valve, the flow of the coolant into the transmission shaft is accurately controlled to effectively utilize the coolant in the internal flow passage under different operating conditions, so that the integrated oil plug can meet the dual functions of sealing the through hole and supplying oil from the internal flow passage to the transmission shaft at different temperatures.

[0005] In one possible implementation, the length of the cavity of the one groove is greater than the length of the portion of the ring-shaped member inserted into the shaft hole of the transmission shaft along the axial direction of the power assembly, the bottom of the one groove is located on the side of the oil hole along the axial direction of the valve, and the distance between the valve and the bottom of the one groove is less than or equal to the distance between the oil hole and the bottom of the one groove. The valve is installed close to the bottom of the groove, which can minimize the overall length of the integrated oil block, avoid the valve protruding from the groove, prevent the valve from affecting the installation of the input shaft and the motor shaft, and ensure that the coolant in the groove can flow into the shaft hole of the input shaft through the center hole to form a cooling oil passage.

[0006] In one possible implementation, the inner side wall of the one groove includes a ring groove, the ring groove is located on the side of the opening of the one groove along the axial direction of the valve, the ring groove is used to accommodate a snap ring, the radial width of the snap ring is greater than the radial depth of the ring groove, and the inner diameter of the center hole of the snap ring is less than the outer diameter of the valve. After the valve is installed into the groove from the opening, the snap ring partially protruding from the ring groove can limit the valve in the groove, which helps to improve the structural stability of the integrated oil block.

[0007] In one possible implementation, the valve includes a valve sleeve, a valve shaft, a ring-shaped valve core, two springs and a temperature sensing assembly, the center hole of the valve sleeve is used to accommodate one of the springs, one end of the valve shaft and the valve core, the center hole of the valve sleeve includes two inner wall surfaces, one of the inner wall surfaces is located on the side of the opening of the one groove along the axial direction of the other inner wall surface, the outer diameter of the valve core is less than the inner diameter of the one inner wall surface and equal to the inner diameter of the other inner wall surface, the valve core and the other spring are sleeved on the valve shaft, the two ends of the one spring are used to fix the outer peripheral surface of the valve shaft and the one inner wall surface of the valve sleeve respectively, the two ends of the other spring are used to fix the outer peripheral surface of the valve shaft and one end of the valve core along the axial direction respectively, the other spring is located on the two sides of the one spring along the axial direction of the valve core, and the temperature sensing assembly is located on the two ends of the one spring along the axial direction of the valve shaft and is used to push the valve shaft to move towards the one spring. When the temperature of the power assembly is too high, the temperature sensing assembly drives the valve shaft to move towards the opening of the one groove, the other spring sleeved on the valve shaft pushes the valve core to enter the space surrounded by the one inner wall surface from the space surrounded by the other inner wall surface, thereby forming a coolant passage, so that the coolant can enter the shaft hole of the input shaft through the valve to cool the input shaft. When the power assembly is not running or the temperature of the power assembly is low, the temperature sensing assembly has a small volume, the other spring sleeved on the valve shaft pushes the valve core to be clamped in the space surrounded by the other inner wall surface, and the valve throttles to reduce the flow of the coolant into the input shaft, which is beneficial to saving the amount of coolant.

[0008] In one possible implementation, the bottom of the groove comprises another groove, the inner diameter of the other groove is smaller than that of the groove, the other groove is used to accommodate one end of the valve shaft and the temperature sensing assembly, and the one end of the valve shaft and the bottom of the other groove are located on the two axial sides of the temperature sensing assembly. The temperature sensing assembly can be completely accommodated in the other groove, and the gap between the temperature sensing assembly and the other groove is small or completely non-existent. The groove limits the deviation of the valve shaft during axial movement by clamping the temperature sensing assembly, thereby ensuring the accurate control of the valve and effectively improving the stability and reliability of the operation of the power assembly.

[0009] In one possible implementation, the bottom of the groove comprises another ring groove, the other ring groove is used to surround the other groove, and the oil hole is used to penetrate the outer peripheral wall of the other ring groove in the radial direction of the power assembly. The oil hole penetrates the outer peripheral wall of the other ring groove in the radial direction of the power assembly, the other ring groove is in communication with the liquid outlet hole through the oil hole, and a cooling liquid passage is formed. The cooling liquid in the internal flow channel enters the gap through the liquid outlet hole, the cooling liquid in the gap enters the other ring groove through the oil hole, and the temperature sensing assembly accommodated in the other ring groove adjusts the opening of the valve according to the temperature of the cooling liquid, thereby accurately controlling the flow of the cooling liquid into the shaft hole of the input shaft.

[0010] In one possible implementation, the threaded segment comprises another through hole, the other through hole is used to penetrate the threaded segment in the axial direction of the power assembly, and the valve comprises a solenoid valve. The other through hole is used to accommodate and fix at least one of a power line and a signal line of the solenoid valve. When the valve is a solenoid valve, the other through hole can be used to accommodate and fix the power line and the signal line of the solenoid valve to ensure the normal operation of the solenoid valve. The power line is used to connect a power source and provide the solenoid valve with the required power for operation, and the power line ensures that the solenoid valve can obtain sufficient power to drive the opening or closing of the valve. The signal line is used to transmit a control signal to the solenoid valve to control the on-off state of the solenoid valve. Through the change of the current on the signal line, the opening or closing amplitude of the solenoid valve can be controlled, and the flow of the cooling liquid into the input shaft can be accurately controlled.

[0011] In one possible implementation, the shell includes a bearing groove, the through hole is used to penetrate the bottom of the bearing groove in the axial direction of the power assembly, the bearing groove is used to accommodate a bearing, the bearing is used to surround one end of the transmission shaft, and the length of the part of the ring-shaped member accommodated in the transmission shaft in the axial direction of the power assembly is greater than the length of the bearing. The length of the part of the ring-shaped member accommodated in the input shaft in the axial direction of the power assembly is greater than the length of the input shaft bearing, so as to ensure that, after the valve is integrated in the integrated oil plug, the part of the integrated oil plug accommodated on one side of the input shaft is increased, instead of extending to the side close to the through hole, so as to prevent the axial length of the power assembly from being increased and to avoid the integrated oil plug from occupying too much space of the power assembly and affecting the arrangement of other components and the structure of the vehicle.

[0012] In one possible implementation, the side wall of the ring-shaped member includes a plurality of oil holes, the plurality of oil holes are arranged at intervals in the circumferential direction of the ring-shaped member, the inner diameter of the wall surface on which the liquid outlet hole is located is greater than the outer diameter of the wall surface on which the oil hole is located, and the annular gap between the wall surface on which the liquid outlet hole is located and the wall surface on which the oil hole is located is used to connect the liquid outlet hole and the plurality of oil holes. The ring-shaped member is screwed into the through hole along the threaded section, and after being screwed into place, the annular gap exists between the plurality of oil holes of the ring-shaped member and the liquid outlet hole. The cooling liquid in the internal flow channel enters the annular gap through the liquid outlet hole, the cooling liquid in the annular gap enters the recess through the plurality of oil holes, and then flows to the shaft hole of the input shaft through the recess, so as to cool the input shaft. Even if the integrated oil plug is not screwed into place, the cooling liquid can enter the oil hole through the liquid outlet hole due to the existence of the annular gap. The plurality of oil holes can improve the efficiency of the cooling liquid entering the recess, ensure that the cooling liquid can be uniformly and continuously supplied to the recess, help to reduce the friction and wear between the ring-shaped member and the through hole, and improve the operation efficiency and service life of the power assembly. In addition, the plurality of oil holes can guide the cooling liquid to flow along a specific path, so as to realize the optimized distribution and circulation of the cooling liquid and help to reduce the waste and leakage of the cooling liquid.

[0013] In a possible implementation, the outer diameter of the ring-shaped member is smaller than the outer diameter of the threaded segment, the through hole includes two openings, and the two openings are located at the axial ends of the through hole, wherein the inner diameter of one of the openings is equal to the inner diameter of the internal thread, greater than the inner diameter of the other opening, and greater than the outer diameter of the portion of the ring-shaped member inserted into the shaft hole of the transmission shaft. The inner diameters of the two openings of the through hole are inconsistent, which can provide an accurate positioning reference for installing the integrated oil plug, one opening is used to accommodate the threaded segment, and the other opening is used to accommodate the ring-shaped member, so as to limit the depth of the integrated oil plug screwed into the through hole, and make the installation process smoother and more accurate. When the through hole is matched with the integrated oil plug, the two openings and the threaded segment and the ring-shaped member can form a more tightly sealed structure, which helps to prevent the cooling liquid from leaking and external contaminants from entering the inside of the speed reducer through the through hole, thereby maintaining the good working state of the speed reducer. The reducer end cover has different wall thicknesses at the two openings, which is beneficial to optimizing the structural strength of the reducer end cover, helping to resist the vibration and impact generated by the power assembly during operation, and improving the durability and reliability of the reducer end cover.

[0014] In a possible implementation, the inner diameter of the other opening is greater than the outer diameter of the portion of the ring-shaped member accommodated in the transmission shaft. The inner diameter of the other opening is greater than the outer diameter of the portion of the ring-shaped member accommodated in the input shaft, and the portion of the ring-shaped member accommodated in the input shaft can be in and out of the other opening in the axial direction. When the integrated oil plug is assembled or disassembled, the integrated oil plug can be directly screwed from the through hole, which helps to improve the assembly and disassembly convenience of the integrated oil plug.

[0015] In a possible implementation, the inner diameter of the other opening is smaller than the inner diameter of the shaft hole of the transmission shaft. The inner diameter of the other opening is smaller than the inner diameter of the shaft hole of the input shaft, and during the installation of the integrated oil plug, the larger inner diameter of the shaft hole is beneficial to provide a more relaxed insertion space for the integrated oil plug, and the larger inner diameter of the shaft hole can allow a certain degree of deviation, so that the integrated oil plug can be more smoothly inserted into the appropriate position. The solid wall of the portion of the inner diameter of the other opening blocks the flow of the cooling liquid, effectively prevents the reverse leakage of the cooling liquid from the integrated oil plug, and ensures that the cooling liquid can flow along the designed path, better lubricating and cooling the components of the power assembly.

[0016] In a possible implementation, the integrated oil plug comprises a leakage section, the leakage section is arranged at the axial two ends of the threaded section and the ring-shaped part, the outer diameter of the leakage section is greater than the inner diameter of the one opening, and the leakage section is arranged at the axial two sides of the transmission shaft and the housing. When the integrated oil plug is screwed into the through hole, the leakage section is arranged at the axial side of the through hole away from the input shaft. When the integrated oil plug is assembled into the through hole, the outer diameter of the leakage section is relatively large, and the leakage section is in contact with the outer side of the housing, so that the depth of the integrated oil plug screwed into the through hole is limited, and damage or sealing failure caused by excessive screwing is avoided.

[0017] In a possible implementation, the transmission shaft comprises a reducer input shaft, the ring-shaped part is inserted into one end of the reducer input shaft, and one end of a motor shaft of a drive motor of the power assembly is inserted into the other end of the reducer input shaft. The input shaft and the motor shaft are key parts for transmitting and converting power in the power assembly, and the ring-shaped part is inserted into the input shaft to input the cooling liquid into the shaft hole of the input shaft. The valve in the integrated oil plug can adjust the flow of the cooling liquid into the shaft hole at different temperatures. At low temperature, the flow of the cooling liquid into the shaft hole is reduced, and the amount of the cooling liquid is saved; at high temperature, the flow of the cooling liquid into the shaft hole is increased, and the input shaft is rapidly cooled. One end of the motor shaft of the drive motor extends into the shaft hole of the input shaft of the reducer, and the shaft hole of the input shaft of the reducer can transmit the cooling liquid to the shaft hole of the motor shaft, so that the motor shaft is cooled.

[0018] The application further provides an electric vehicle, comprising a plurality of wheels and a power assembly configured to drive one or more of the wheels. The power assembly generates power and transmits the power to the wheels, and the wheels drive the electric vehicle to move forward by using the power. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 FIG. 1 is a schematic diagram of an electric vehicle provided by an embodiment of the application;

[0020] Figure 2 FIG. 2 is a schematic diagram of a power assembly provided by an embodiment of the application;

[0021] Figure 3 FIG. 3 is a schematic diagram of a power assembly provided by an embodiment of the application;

[0022] Figure 4 FIG. 4 is a schematic diagram of a power assembly provided by an embodiment of the application;

[0023] Figure 5 FIG. 5 is an exploded schematic diagram of a power assembly provided by an embodiment of the application;

[0024] Figure 6 FIG. 6 is a schematic diagram of a power assembly provided by an embodiment of the application; Figure 4 FIG. 7 is a sectional view of A-A in FIG. 6;

[0025] Figure 7 is a schematic view of a power assembly provided by an embodiment of the present application;

[0026] Figure 8 is Figure 7 is an enlarged view of I in FIG. 1;

[0027] Figure 9 is a schematic view of an integrated oil block provided by an embodiment of the present application;

[0028] Figure 10 is Figure 9 is a sectional view of B-B in FIG. 1;

[0029] Figure 11 is a schematic view of a power assembly provided by an embodiment of the present application;

[0030] Figure 12 is a schematic view of an integrated oil block provided by an embodiment of the present application;

[0031] Figure 13 is a schematic view of an integrated oil block provided by an embodiment of the present application;

[0032] Figure 14 is a schematic view of a power assembly provided by an embodiment of the present application;

[0033] Figure 15 is a schematic view of a power assembly provided by an embodiment of the present application;

[0034] Figure 16 is a schematic view of a housing provided by an embodiment of the present application. DETAILED DESCRIPTION

[0035] The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0036] When the electric vehicle is running, the powertrain operates efficiently, and the mutual friction and energy conversion of the internal mechanical components generate a large amount of heat energy. If the heat is not effectively dissipated in time, it will adversely affect the performance stability, durability and overall efficiency of the powertrain. Therefore, in order to ensure the continuous and efficient and safe operation of the powertrain, a cooling liquid circulation system is often introduced into the powertrain. The system uses the flowability and thermal conductivity of the cooling liquid to effectively absorb and carry away the excess heat generated inside, thereby maintaining the powertrain within the appropriate working temperature range. However, designing too many components inside the powertrain to guide the flow of cooling liquid will bring a series of complexity and cost problems. Too many components mean a more complex internal structure, which not only increases the difficulty and precision requirements of processing and manufacturing, increases the manufacturing cost, but also may cause cumbersome and time-consuming in the assembly process, increasing the risk of assembly errors. At the same time, the complex internal structure may also affect the smoothness of the cooling liquid flow, reduce the cooling efficiency, and even cause local overheating or uneven cooling problems in some cases.

[0037] To solve the above problems, the embodiment of the present application provides a powertrain with an integrated oil plug. The housing of the powertrain includes a through hole and an integrated oil plug. The through hole is used to communicate the inside and outside of the housing along the axial direction of the powertrain, and the integrated oil plug is used to pass through the through hole. The hole wall of the through hole includes an outlet hole, and the integrated oil plug includes a threaded segment and an annular piece. The threaded segment is used to extend into the through hole and engage the internal thread of the through hole. One end of the annular piece is connected to the axial end face of one end of the threaded segment, and the other end of the annular piece is used to extend into the shaft hole of a transmission shaft in the powertrain. The side wall of the annular piece includes an oil hole, and the inner cavity of the annular piece and the axial end face of the threaded segment enclose a groove. The oil hole is used to communicate the outlet hole and a groove along the radial direction of the annular piece. The slot of one groove is located at the other end of one annular piece, and the slot cavity of one groove is used to accommodate a valve. The valve is used to adjust the flow of the cooling liquid in the integrated oil plug.

[0038] The embodiment of the present application provides an electric vehicle 1. Please refer to Figure 1 , Figure 1 is a schematic diagram of the electric vehicle provided by the embodiment of the present application. The electric vehicle 1 includes a powertrain 10 and a plurality of wheels 20. The powertrain 10 generates power and transmits the power to the wheels 20. The wheels 20 drive the electric vehicle 1 to move forward by using the power. In one embodiment, the electric vehicle 1 also includes a power battery 30. The power battery 30 is connected to the powertrain 10. The powertrain 10 receives the electric energy of the power battery 30 and converts it into mechanical energy. The mechanical energy is transmitted to the wheels 20 to drive the wheels to rotate, thereby driving the electric vehicle 1 to move forward.

[0039] In an embodiment, the electric vehicle 1 comprises a front drive vehicle, a rear drive vehicle and an all-wheel drive vehicle. In an embodiment, the powertrain 10 is configured to drive two front wheels of the electric vehicle 1, or to drive two rear wheels of the electric vehicle 1. In an embodiment, the number of powertrains 10 is two, wherein one powertrain 10 is configured to drive two front wheels of the electric vehicle 1, and the other powertrain 10 is configured to drive two rear wheels of the electric vehicle 1.

[0040] In an embodiment, the number of wheels 20 of the electric vehicle 1 is at least two, such as the electric vehicle 1 can be a two-wheeled, three-wheeled or four-wheeled vehicle. In an embodiment, the electric vehicle 1 comprises a battery electric vehicle (BEV), a hybrid electric vehicle (HEV) and a range extended electric vehicle (REEV).

[0041] In an embodiment, please refer to Figure 2 , Figure 2 is a schematic diagram of the powertrain provided by the embodiment of the present application, the powertrain 10 comprises a reducer 100 and a drive motor 200, the drive motor 200 converts the electric energy of the power battery 30 into mechanical energy, the motor shaft 210 of the drive motor 200 generates rotary power, the reducer 100 adjusts the power and enables the power to be effectively transmitted to the wheels 20, and the electric vehicle 1 is driven forward. In an embodiment, the reducer 100 comprises a single-gear reducer, a two-gear reducer or a transmission.

[0042] In an embodiment, please continue to refer to Figure 2 , the reducer 100 comprises an input shaft 110, an intermediate shaft 120 and an output shaft 130. Among them, the motor shaft 210 is in driving connection with the input shaft 110, the gear of the input shaft 110 is in meshing connection with the gear of the intermediate shaft 120, the transmission of the power is realized, the intermediate shaft 120 is connected with the output shaft 130 and transmits the power to the output shaft 130, the output shaft 130 is in driving connection with the wheels 20, and the electric vehicle 1 is driven forward. In an embodiment, the output shaft 130 of the reducer 100 is in driving connection with two wheels 20 through two half shafts 300.

[0043] In an embodiment, the input shaft 110, the intermediate shaft 120, the output shaft 130 of the reducer 100 and the motor shaft 210 of the drive motor 200 are called the transmission shafts (110, 120, 130, 210) of the powertrain 10, and at least one transmission shaft in the powertrain 10 comprises a shaft hole for transmitting the cooling liquid.

[0044] In one embodiment, the input shaft 110 comprises a shaft hole 111, and the motor shaft 210 comprises another shaft hole 211. The input shaft 110 and the motor shaft 210 are inserted and fitted, and the shaft hole 111 of the input shaft 110 and the shaft hole 211 of the motor shaft 210 are communicated. In one embodiment, the transmission shaft (110, 120, 130, 210) is at least one of the input shaft 110, the intermediate shaft 120, the output shaft 130 and the motor shaft 210. In one embodiment, the transmission shaft in the power assembly 10 takes the input shaft 110 as an example, the motor shaft 210 of the driving motor 200 extends into the shaft hole 111 of the input shaft 110 of the speed reducer 100, and the shaft hole 111 of the input shaft 110 of the speed reducer 100 can transmit the cooling liquid to the shaft hole 211 of the motor shaft 210.

[0045] The embodiment of the present application provides a power assembly 10, please refer to Figure 3 and Figure 4 , Figure 3 is a schematic diagram of the power assembly provided by the embodiment of the present application, Figure 4 is a schematic diagram of the power assembly provided by the embodiment of the present application, and the power assembly 10 comprises a housing 400, and the housing 400 is used for accommodating at least one of the speed reducer 100 or the driving motor 200. In one embodiment, the housing 400 of the power assembly 10 takes the speed reducer end cover 140 as an example, and the cavity surrounded by the speed reducer groove arranged on the speed reducer end cover 140 and the housing 400 is used for accommodating the input shaft 110, the intermediate shaft 120 and the output shaft 130.

[0046] In one embodiment, please refer to Figure 5 , Figure 5 is an explosion schematic diagram of the power assembly provided by the embodiment of the present application. The housing 400 comprises a through hole 410, the through hole 410 penetrates the housing 400 along the axial direction of the power assembly 10, the through hole 410 communicates the inside and the outside of the housing 400, and an opening is formed on the inner surface and the outer surface of the housing 400, respectively. In one embodiment, the through hole 410 is the assembly hole of the speed reducer end cover 140, the motor mounting tool can pass through the through hole 410 from the outside of the speed reducer end cover 140, and extend into the cavity surrounded by the speed reducer groove arranged on the speed reducer end cover 140 and the housing 400 through the through hole 410, and the part of the motor mounting tool extending into the cavity surrounded by the speed reducer groove arranged on the speed reducer end cover 140 and the housing 400 can be matched with the motor shaft 210 of the driving motor 200, so as to facilitate the alignment connection between the motor shaft 210 of the driving motor 200 and the input shaft 110 of the speed reducer 100. In one embodiment, the through hole 410 comprises a circular hole, an elliptical hole and a rectangular hole, etc., the circular hole is easy to be formed by mechanical processing modes such as drilling and milling, and is easy to be matched with the screw structure.

[0047] In one embodiment, please refer to Figure 6 and Figure 7, Figure 6 For Figure 4 A-A is a cross-sectional view of the middle part, Figure 7 is a schematic diagram of a power assembly provided by an embodiment of the present application. The shell 400 includes a bearing groove 420 for fixing the bearing of the input shaft 110 of the speed reducer 100 or the bearing of the motor shaft 210 of the driving motor 200, so as to fix the input shaft 110 or the motor shaft 210. The through hole 410 penetrates the groove bottom of the bearing groove 420 along the center line direction of the through hole 410. In an embodiment, the bearing groove 420 is used for fixing the bearing of the input shaft 110. The center line of the through hole 410 coincides with the axis of the input shaft 110. The through hole 410 communicates with the shaft hole 111 of the input shaft 110. The cooling liquid can enter the input shaft 110 from the through hole 410 through the shaft hole 111, so as to cool the input shaft 110.

[0048] In an embodiment, please continue to refer to Figure 6 The inner periphery of the through hole 410 includes a liquid outlet hole 411. The liquid outlet hole 411 communicates the through hole 410 and the internal flow channel 430 in the shell 400. The cooling liquid can flow into the through hole 410 from the internal flow channel 430 through the liquid outlet hole 411, and cool the transmission shaft (110, 120, 130, 210) through the through hole 410. In an embodiment, the liquid outlet hole 411 can be an opening of the internal flow channel 430 on the inner periphery of the through hole 410.

[0049] In an embodiment, please continue to refer to Figure 2 , Figure 5 and Figure 6, the housing 400 includes an integrated oil plug 440, after the transmission shaft (110, 120, 130, 210) is installed, for example, the input shaft 110 of the reducer 100 and the motor shaft 210 of the drive motor 200, and the motor installation tool is extracted, the through hole 410 is sealed by the integrated oil plug 440, which can prevent the cooling liquid in the housing 400 from leaking through the through hole 410, and can also prevent impurities from entering the housing 400 through the through hole 410 to pollute the power assembly 10, and the housing 400 is provided with an internal flow channel 430, and the cooling liquid can be delivered to the bearing in the power assembly 10 through the internal flow channel 430. In one embodiment, the cooling liquid enters the through hole 410 from the internal flow channel 430 through the liquid outlet hole 411, and then enters the transmission shaft (110, 120, 130, 210) through the shaft hole to cool the transmission shaft (110, 120, 130, 210). Taking the cooling of the input shaft 110 and the motor shaft 210 as an example, the cooling liquid in the internal flow channel 430 flows out through the liquid outlet hole 411, enters the through hole 410, and then enters the input shaft 110 through the shaft hole 111 of the input shaft 110 to cool the input shaft 110; then, the cooling liquid enters the shaft hole 211 of the motor shaft 210 through the shaft hole 111 of the input shaft 110 to cool the motor shaft 210.

[0050] In one embodiment, please refer to Figure 8 , Figure 8 is Figure 7 is an enlarged view of I in

[0051] In one embodiment, please refer to Figure 8 and Figure 9 , Figure 9A schematic view of an integrated oil plug provided by an embodiment of the present application, the integrated oil plug 440 comprises a threaded segment 441 and a ring member 442, the threaded segment 441 and the ring member 442 are arranged in sequence along the axial direction of the power assembly 10, and one end of the ring member 442 is connected to the axial end face of one end of the threaded segment 441. In an embodiment, the threaded segment 441 and the ring member 442 can be made of a material, for example, both are metal materials, the threaded segment 441 and the ring member 442 can be connected as an integrated structure by welding, or can be integrally injection molded; the integrated structure simplifies the installation process, reduces the installation steps and debugging time. In an embodiment, the threaded segment 441 and the ring member 442 are riveted, riveting is conducive to enhancing the connection strength between the threaded segment 441 and the ring member 442, and is helpful to improve the shock resistance and fatigue resistance of the integrated oil plug 440, and improve the stability of the power assembly 10.

[0052] In an embodiment, please refer to Figure 5 , Figure 8 and Figure 9 When the integrated oil plug 440 is installed into the through hole 410, the external thread 4411 of the threaded segment 441 can be engaged with the internal thread 412 of the through hole 410 by screwing the integrated oil plug 440 to realize the fixed connection between the integrated oil plug 440 and the through hole 410. In an embodiment, when the threaded segment 441 is screwed to connect with the internal thread 412 of the through hole 410, the ring member 442 can rotate with the threaded segment 441 and enter into the through hole 410. In an embodiment, the threaded segment 441 can be in a cylindrical shape, and the external thread 4411 is arranged on the outer circumferential surface of the cylinder. The cylindrical threaded segment 441 can be in a solid structure, or can be a sleeve-shaped hollow structure.

[0053] In an embodiment, the ring member 442 is screwed into the through hole 410 with the threaded segment 441, and the axial direction of the ring member 442 is parallel or coincides with the axial direction of the transmission shaft (110, 120, 130, 210) in the power assembly 10. In an embodiment, the diameter of the other end of the ring member 442 is smaller than the diameter of the shaft hole of the transmission shaft (110, 120, 130, 210), so that the other end of the ring member 442 extends into the shaft hole of the transmission shaft (110, 120, 130, 210).

[0054] In an embodiment, please refer to Figure 7 , Figure 8 and Figure 9The annular member 442 includes an oil hole 4421 on the outer circumferential surface of the annular member 442 and penetrating through the outer circumferential surface of the annular member 442, and the oil hole 4421 is spaced apart from the liquid outlet hole 411 to form a gap 4111, and the gap 4111 communicates the oil hole 4421 and the liquid outlet hole 411. In an embodiment, the inner cavity 4422 of the annular member 442 and the axial end surface of the threaded segment 441 enclose a recess 443, and the slot opening 4431 of the recess 443 is located on the axial side of the annular member 442 away from the threaded segment 441, and the oil hole 4421 communicates the gap 4111 and the recess 443. In an embodiment, the annular member 442 includes a central hole 4423 located on the axial side of the annular member 442 away from the threaded segment 441, and the central hole 4423 communicates the recess 443 and the shaft hole of the transmission shaft (110, 120, 130, 210).

[0055] The cooling liquid in the internal flow channel 430 enters the gap 4111 through the liquid outlet hole 411, and then enters the recess 443 in the annular member 442 through the oil hole 4421, and then flows through the central hole 4423 to enter the shaft hole of the transmission shaft (110, 120, 130, 210) to cool the transmission shaft (110, 120, 130, 210).

[0056] In an embodiment, please refer to Figure 8 and Figure 10 , Figure 10 for the cross-sectional view of B-B in Figure 9 . The integrated oil plug 440 includes a valve 444 accommodated in the slot cavity 4432 of the recess 443, and the valve 444 is fixedly connected with the inner wall of the recess 443. In an embodiment, the inner wall of the recess 443 includes a side wall 4433 and a slot bottom 4434. In an embodiment, the axial length of the valve 444 is less than the axial length of the slot cavity 4432, and the radial width of the valve 444 is less than the radial width of the slot cavity 4432, so that the valve 444 can be completely accommodated in the slot cavity 4432, avoiding that the size of the integrated oil plug 440 is too large to affect the assembly with the through hole 410 and the delivery of the cooling liquid.

[0057] In an embodiment, the valve 444 is used to adjust the flow of the coolant in the integrated oil plug 440. In an embodiment, the valve 444 is a temperature-sensitive valve, which can sense the change of temperature and automatically adjust the opening of the valve 444 accordingly. When the temperature is low, the opening of the valve 444 is reduced, thereby reducing the flow of the coolant to the output of the transmission shaft (110, 120, 130, 210), saving the coolant; when the temperature is high, the opening of the valve 444 is increased, thereby increasing the flow of the coolant to the output of the transmission shaft (110, 120, 130, 210), rapidly cooling the transmission shaft (110, 120, 130, 210) and ensuring the smooth operation of the power assembly 10. In an embodiment, the valve 444 includes a mechanical valve or an electromagnetic valve. The mechanical valve has a relatively simple structure and a relatively tight fit between the mechanical components, thus having high stability and being able to maintain stable control effect for a long time. The electromagnetic valve uses electromagnetic principle to achieve control, has rapid response and can respond to temperature change in a short time.

[0058] In an embodiment, Figure 6 , Figure 7 and Figure 10 The integrated oil plug 440 has a combined structure of multiple cylindrical segments in the axial direction, and the circumferential side wall is the circumferential surface of the multiple cylindrical segments. In an embodiment, the integrated oil plug 440 has a threaded segment 441, a ring-shaped member 442, and a valve 444, forming an integrated structure.

[0059] The threaded segment 441 can engage with the internal thread 412 on the hole wall of the through hole 410, and the threaded segment 441 can be fixed in the through hole 410 and fixedly connected with the inner wall of the through hole 410, thereby sealing the through hole 410. The ring-shaped member 442 has an oil hole 4421 and a central hole 4423. The oil hole 4421 is located on the outer circumferential surface of the ring-shaped member 442 and communicates with the liquid outlet hole 411. The central hole 4423 extends along the axial direction of the ring-shaped member 442 away from the threaded segment 441 to form a cooling oil passage, and the oil hole 4421 communicates with the central hole 4423 through the groove 443.

[0060] When the power assembly 10 is running at a high temperature, the cooling liquid delivered by the internal flow channel 430 can enter the gap 4111 between the annular member 442 and the through hole 410 through the liquid outlet hole 411, and flow through the oil hole 4421 into the groove 443 of the annular member 442 through the gap 4111. At this time, the opening of the valve 444 in the groove 443 is large, and a large amount of cooling liquid can flow through the central hole 4423 of the groove 443 into the shaft hole of the transmission shaft (110, 120, 130, 210) in the power assembly 10, such as the shaft hole 111 of the input shaft 110 of the speed reducer 100, to cool and lower the temperature of the rotating shaft of the speed reducer 100. When the power assembly 10 is running at a low temperature, the opening of the valve 444 in the groove 443 is small or completely closed, and a small amount or no cooling liquid can flow through the central hole 4423 of the groove 443 to cool the transmission shaft (110, 120, 130, 210), thereby saving the consumption of cooling oil at low temperature.

[0061] In the embodiment of the present application, the threaded segment 441, the annular member 442 and the valve 444 are integrated into an integrated oil plug 440 of an integrated structure, which only needs to be screwed into the through hole 410 during assembly to realize the sealing of the through hole 410 and the connection of the oil passage between the internal flow channel 430 and the transmission shaft (110, 120, 130, 210), without the need to assemble multiple components, which is beneficial to reduce the machining cost of the power assembly 10 and improve the assembly efficiency, and is more beneficial to maintenance and replacement of components. The opening of the valve 444 is changed to accurately control the flow of cooling liquid into the transmission shaft (110, 120, 130, 210), so that the cooling liquid in the internal flow channel 430 can be effectively utilized under different motion conditions, and the integrated oil plug 440 can meet the dual functions of sealing the through hole 410 and delivering oil from the internal flow channel 430 to the transmission shaft (110, 120, 130, 210) at different temperatures.

[0062] In the embodiment of the present application, please continue to refer to Figure 7 and Figure 8 , along the axial direction of the power assembly 10, the length of the groove cavity 4432 of one groove 443 is greater than the length of the part of the annular member 442 inserted into the shaft hole of the transmission shaft (110, 120, 130, 210), the groove bottom 4434 of one groove 443 is located on the axial side of the oil hole 4421, and the distance between the valve 444 and the groove bottom 4434 of one groove 443 is less than or equal to the distance between the oil hole 4421 and the groove bottom 4434 of one groove 443.

[0063] In one embodiment, the groove 443 in the ring member 442 has sufficient axial length to ensure that at least part of the groove 443 is located outside the shaft hole 111 of the input shaft 110, and the groove bottom 4434 of the groove 443 is located on the axial side of the shaft hole 111 close to the threaded section 441. In one embodiment, the oil hole 4421 is located on the outer circumferential surface of at least part of the groove 443 outside the shaft hole 111 of the input shaft 110, and the oil hole 4421 and the liquid outlet hole 411 can communicate through the gap 4111 to form a cooling liquid passage.

[0064] In one embodiment, referring to Figure 8 , Figure 9 and Figure 10 , the ring member 442 has a multi-section cylindrical structure along the axial direction of the power assembly 10, wherein: one section 4435 of the ring member 442 has a diameter greater than that of the shaft hole 111 of the input shaft 110, and is located on the axial side of the shaft hole 111 of the input shaft 110 close to the threaded section 441; the oil hole 4421 is located on the outer circumferential surface of the one section 4435 of the ring member 442; the cooling liquid can enter the gap 4111 through the liquid outlet hole 411, and then enter the groove cavity 4432 of the groove 443 through the oil hole 4421; another section 4436 of the ring member 442 has a diameter less than or equal to that of the shaft hole 111 of the input shaft 110, so as to be inserted into the shaft hole of the input shaft 110 to deliver the cooling liquid to the input shaft 110.

[0065] In one embodiment, referring to Figure 8 and Figure 10 , the valve 444 is accommodated in the groove 443, the shortest distance between the valve 444 and the groove bottom 4434 of the groove 443 is less than or equal to the shortest distance between the oil hole 4422 and the groove bottom 4434 of the groove 443, at least part of the valve 444 is opposite to the oil hole 4422, the cooling liquid can enter the groove 443 through the oil hole 4422, and the valve 444 accommodated in the groove 443 can adjust the flow rate of the cooling liquid according to different temperatures. In one embodiment, one end of the valve 444 is fixed to the groove bottom 4434 of the groove 443, and the fixing mode includes welding, gluing, bolting, etc.

[0066] In one embodiment, the valve 444 is installed close to the groove bottom 4434 of the groove 443, which can minimize the overall length of the integrated oil plug 440, avoid the valve 444 protruding from the groove 443, prevent the valve 444 from affecting the installation of the input shaft 110 and the motor shaft 210, and ensure that the cooling liquid in the groove 443 can flow into the shaft hole 111 of the input shaft 110 through the center hole 4423 to form a cooling oil passage.

[0067] In one embodiment, one end of the valve 444 is fixed to the bottom 4434 of the groove 443 by welding, gluing, bolting or other means. Directly fixing one end of the valve 444 to the bottom 4434 of the groove 443 can enhance the overall rigidity of the integrated oil plug 440, preventing loosening or leakage due to vibration of the power assembly 10 or pressure fluctuation. Directly fixing the valve 444 can also make the valve 444 more stable when subjected to coolant pressure, reducing fatigue damage caused by vibration.

[0068] In the embodiments of the present application, please refer to Figure 8 and Figure 10 The inner side wall 4433 of one groove 443 includes a ring groove 4437, which is located on the axial side of the valve 444 relative to the opening 4431 of the groove 443, and is used to accommodate a snap ring 445. The radial width of the snap ring 445 is greater than the radial depth of the ring groove 4437, and the inner diameter of the central hole 4451 of the snap ring 445 is less than the outer diameter of the valve 444.

[0069] In one embodiment, the inner side wall 4433 of the groove 443 includes a ring groove 4437, which extends circumferentially along the inner side wall 4433 and is located on the axial side of the valve 444 relative to the opening 4431 of the groove 443. The opening of the ring groove 4437 faces the central axis of the groove 443.

[0070] In one embodiment, the ring groove 4437 is used to accommodate the snap ring 445. In one embodiment, the snap ring 445 is an elastic C-shaped ring, which can be assembled in the ring groove 4437 by squeezing. The snap ring 445 has a certain elasticity, and the opening part of the snap ring 445 will tightly adhere to the inner wall of the ring groove 4437 due to the elastic force, thereby achieving fixation.

[0071] In one embodiment, the radial width of the snap ring 445 is greater than the radial depth of the ring groove 4437, and the snap ring 445 at least partially protrudes from the ring groove 4437. In one embodiment, the inner diameter of the central hole 4451 of the snap ring 445 is less than the outer diameter of the valve 444. After the valve 444 is assembled into the groove 443 from the opening 4431, the part of the snap ring 445 protruding from the ring groove 4437 can limit the valve 444 in the groove 443, which helps to improve the structural stability of the integrated oil plug 440.

[0072] In the embodiments of the present application, please refer to Figure 10The valve 444 includes a valve sleeve 4441, a valve shaft 4442, an annular valve core 4443, two springs (4444, 4445) and a temperature sensing assembly 4446. The central hole of the valve sleeve 4441 is used to accommodate one of the springs 4444, one end of the valve shaft 4442 and the valve core 4443. The central hole of the valve sleeve 4441 includes two sections of inner wall surface (4448, 4449), one of which (4448) is used to be located on the axial side of the notch 4431 of the groove 443, and the outer diameter of the valve core 4443 is used to be smaller than the inner diameter of the one section of inner wall surface 4448 and equal to the inner diameter of the other section of inner wall surface 4449. The valve core 4443 and the other spring 4445 are both sleeved on the valve shaft 4442. The two ends of one spring 4444 are used to fix the outer peripheral surface of the valve shaft 4442 and one inner wall surface of the valve sleeve 4441 respectively. The two ends of the other spring 4445 are used to fix the outer peripheral surface of the valve shaft 4442 and one axial end of the valve core 4443 respectively. The other spring 4445 is used to be located on the axial two sides of the valve core 4443 with one spring 4444. The temperature sensing assembly 4446 is used to be located on the axial two ends of the valve shaft 4442 with one spring 4444 and is used to push the valve shaft 4442 to move towards one spring 4444.

[0073] In one embodiment, the central hole of the valve sleeve 4441 is used to accommodate one spring 4444, one end of the valve shaft 4442 away from the threaded section 441 and the valve core 4443. The valve core 4443 can move axially in the central hole of the valve sleeve 4441 to adjust the opening of the valve 444 and thus control the flow of the coolant. In one embodiment, the central hole of the valve sleeve 4441 includes one end of the inner wall surface 4448 and the other end of the inner wall surface 4449. One section of the inner wall surface 4448 is located axially close to the notch 4431 of the groove 443, and the other section of the inner wall surface 4449 is located axially close to the through hole 410. In one embodiment, the outer diameter of the valve core 4443 is smaller than the inner diameter of the one section of the inner wall surface 4448, and the outer diameter of the valve core 4443 is equal to the inner diameter of the other section of the inner wall surface 4449. The valve core 4443 can expand and contract in the space enclosed by the one section of the inner wall surface 4448 and the space enclosed by the other section of the inner wall surface 4449. The valve core 4443 can be tightly attached to the other section of the inner wall surface, effectively preventing the flow of the coolant at low temperature, and the valve core 4443 will not be stuck in the one section of the inner wall surface 4448 close to the other section of the inner wall surface 4449, avoiding uneven stress on the valve 444, which leads to unstable structure and shortened life of the integrated oil plug 440.

[0074] In one embodiment, please refer to Figure 8, the valve core 4443 and another spring 4445 are sleeved on the valve shaft 4442, and the other spring 4445 is arranged on the axial two sides of the valve core 4443 together with the spring 4444. In an embodiment, one end of the spring 4444 is used for fixing the outer peripheral surface of the valve shaft 4442 close to the axial one end of the slot 4431 of the groove 443, and the other end of the spring 4444 is used for fixing the inner wall surface of the valve sleeve 4441 close to the axial one end of the slot 4431 of the groove 443. The spring 4444 applies a pre-tightening force to the valve shaft 4442 at low temperature, so that the valve core 4443 on the valve shaft 4442 is tightly attached to the other section of the inner wall surface 4449; at high temperature, the spring 4444 applies a pressure to the valve sleeve 4441, so that the valve core 4443 is formed in the space enclosed by the section of the inner wall surface 4448, thereby forming a cooling liquid passage. In an embodiment, one end of the other spring 4445 is used for fixing the outer peripheral surface of the valve shaft 4442, and the other end of the other spring 4445 is used for fixing the valve core 4443 close to the axial one end of the threaded section 441, and the other spring 4445 is used for pushing the valve core 4443 to move back and forth in the axial direction.

[0075] In an embodiment, the temperature sensing assembly 4446 is arranged on the valve shaft 4442 close to the axial one end of the threaded section 441 and is fixedly connected with the valve shaft 4442. Please refer to Figure 8 When the power assembly 10 operates at a high temperature, the temperature sensing assembly 4446 drives the valve shaft 4442 to move towards the slot 4431 of the groove 443, and the other spring 4445 surrounding the valve shaft 4442 pushes the valve core 4443 from the space enclosed by the other section of the inner wall surface 4449 into the space enclosed by the section of the inner wall surface 4448, thereby forming a cooling liquid passage, so that the cooling liquid can pass through the valve 444 into the shaft hole 111 of the input shaft 110 to cool the input shaft 110. Please refer to Figure 11 , Figure 11 is a schematic view of the power assembly provided in the embodiments of the present application, when the power assembly 10 does not operate or operates at a low temperature, the temperature sensing assembly 4446 has a small volume, the other spring 4445 surrounding the valve shaft 4442 pushes the valve core 4443 to be clamped in the space enclosed by the other section of the inner wall surface 4449, and the valve 444 throttles to reduce the flow of the cooling liquid into the input shaft 110, which is beneficial to saving the amount of the cooling liquid.

[0076] In an embodiment, the temperature sensing assembly 4446 can push the valve shaft 4442 to move according to the change of the temperature, thereby adjusting the opening and closing state of the valve 444. The automatic adjusting capability enables the valve 444 to maintain effective flow control under different temperature environments. In an embodiment, the temperature sensing assembly 4446 includes paraffin wax, which expands to push the valve shaft 4442 to move towards the slot 4431 of the groove 443 when heated, and shrinks to push the valve shaft 4442 to move towards the threaded section 441 at low temperature.

[0077] In one embodiment, one spring 4444 is used to keep the valve shaft 4442 in a certain position, and another spring 4445 cooperates with the temperature sensing assembly 4446 to adjust the position of the valve shaft according to the temperature change. The design of the valve 444 with two springs (4444, 4445) helps to enhance the stability and reliability of the valve 444, and ensures that the valve 444 can maintain stable performance under different working conditions.

[0078] In the embodiments of the present application, please continue to refer to Figure 10 The bottom 4434 of the groove 443 includes another groove 4438, and the inner diameter of the other groove 4438 is smaller than that of the groove 443. The other groove 4438 is used to accommodate one end of the valve shaft 4442 and the temperature sensing assembly 4446, and the one end of the valve shaft 4442 and the bottom of the other groove 4438 are located on the axial sides of the temperature sensing assembly 4446.

[0079] In one embodiment, one end of the valve shaft 4442 and the temperature sensing assembly 4446 are fixedly connected. In one embodiment, the temperature sensing assembly 4446 can be completely accommodated in the other groove 4438, and the gap between the temperature sensing assembly 4446 and the other groove 4438 is small or completely non-existent. The groove 4438 limits the deviation of the valve shaft 4442 during axial movement by clamping the temperature sensing assembly 4446, thereby ensuring the accurate control of the valve 444 and effectively improving the stability and reliability of the operation of the power assembly 10.

[0080] In the embodiments of the present application, please continue to refer to Figure 10 The bottom 4434 of the groove 443 includes another ring groove 4439, and the other ring groove 4439 is used to surround the other groove 4438. The oil hole 4421 is used to penetrate the outer peripheral wall of the other ring groove 4439 along the radial direction of the power assembly 10.

[0081] In one embodiment, the bottom 4434 of the groove 443 includes another annular groove 4439 extending along the inner wall of the groove 443 in the circumferential direction, the central axis of the other annular groove 4439 coincides with the central axis of the groove 443, the other annular groove 4439 surrounds the other groove 4438, and the inner diameter of the other annular groove 4439 is greater than or equal to the outer diameter of the other groove 4438. In one embodiment, the oil hole 4421 penetrates the outer peripheral wall of the other annular groove 4439 in the radial direction of the power assembly 10, the other annular groove 4439 communicates with the liquid outlet hole 411 through the oil hole 4421 to form a cooling liquid passage, the cooling liquid in the internal flow channel 430 enters the gap 4111 through the liquid outlet hole 411, the cooling liquid in the gap 4111 enters the other annular groove 4439 through the oil hole 4421, and the temperature sensing assembly 4446 in the other annular groove 4439 senses the temperature of the cooling liquid and adjusts the opening of the valve 444 according to the demand to accurately control the flow of the cooling liquid into the shaft hole 111 of the input shaft 110.

[0082] In the embodiments of the present application, please refer to Figure 12 、 Figure 13 、 Figure 14 and Figure 15 , Figure 12 is a schematic view of an integrated oil block provided by the embodiments of the present application, Figure 13 is a schematic view of an integrated oil block provided by the embodiments of the present application, Figure 14 is a schematic view of a power assembly provided by the embodiments of the present application, Figure 15 is a schematic view of a power assembly provided by the embodiments of the present application, the threaded segment 441 includes another through hole 4412 for penetrating the threaded segment 441 in the axial direction of the power assembly 10, and the valve 444 includes a solenoid valve 4447, and the other through hole 4412 is used to accommodate and fix at least one of the power line and the signal line of the solenoid valve 4447.

[0083] In one embodiment, the threaded segment 441 is penetrated by the other through hole 4412 in the axial direction of the power assembly 10, and the other through hole 4412 can be used to accommodate other components. For example, when the valve 444 is a solenoid valve 4447, the other through hole 4412 can be used to accommodate and fix the power line and the signal line of the solenoid valve 4447 to ensure the normal operation of the solenoid valve 4447. The power line is used to connect the power supply and provide the solenoid valve 4447 with the required power for operation, so that the solenoid valve 4447 can obtain sufficient power to drive the opening or closing of the valve. The signal line is used to transmit control signals to the solenoid valve 4447 to control the switching state thereof. Through the current change on the signal line, the opening or closing amplitude of the solenoid valve 4447 can be controlled to accurately control the flow of the cooling liquid into the input shaft 110.

[0084] In the embodiments of the present application, please continue to refer to Figure 7 and Figure 8 The housing 400 includes a bearing groove 420, the through hole 410 penetrates the bottom of the bearing groove 420 in the axial direction of the power assembly 10, the bearing groove 420 is used for accommodating a bearing 460, the bearing 460 is used for surrounding one end of the transmission shaft (110, 120, 130, 210), and the length of the part of the annular member 442 accommodated in the transmission shaft (110, 120, 130, 210) in the axial direction of the power assembly 10 is greater than the length of one bearing 460. For example, the inner side of the reducer end cover 140 is provided with an input shaft bearing groove 420, the input shaft bearing groove 420 surrounds the periphery of the through hole 410, the input shaft bearing groove 420 is used for accommodating an input shaft bearing 460, the input shaft bearing 460 can be sleeved on the outer side of the input shaft 110 of the reducer 100, and one end of the input shaft 110 is fixed. The through hole 410 penetrates the bottom of the input shaft bearing groove 420 in the central line direction, and the central line of the through hole 410 coincides with the axis of the input shaft 110 of the reducer 100.

[0085] In one embodiment, the length of the part of the annular member 442 accommodated in the input shaft 110 in the axial direction of the power assembly 10 is greater than the length of one input shaft bearing 460, so as to ensure that, after the valve 444 is integrated in the integrated oil plug 440, the part of the integrated oil plug 440 that is increased is accommodated on one side of the input shaft 110, instead of extending to the side close to the through hole 410, thereby preventing the axial length of the power assembly 10 from being increased, and avoiding that the integrated oil plug 440 occupies too much space of the power assembly 10 and affects the arrangement of other components and the structure of the whole vehicle.

[0086] In the embodiments of the present application, please continue to refer to Figure 6 , Figure 7 and Figure 12 The side wall of the annular member 442 includes a plurality of oil holes 4421, the plurality of oil holes 4421 are arranged at intervals in the circumferential direction of the annular member 442, the inner diameter of the wall surface on which the liquid outlet hole 411 is located is greater than the outer diameter of the wall surface on which the oil hole 4421 is located, and the annular gap 4111 between the wall surface on which the liquid outlet hole 411 is located and the wall surface on which the oil hole 4421 is located is used for connecting the liquid outlet hole 411 and the plurality of oil holes 4421.

[0087] In one embodiment, the plurality of oil holes 4421 are arranged at intervals in the axial direction of the outer peripheral surface of the annular member 442, the outer diameter of the part of the annular member 442 on which the plurality of oil holes 4421 are located is less than the inner diameter of the through hole 410 on which the liquid outlet hole 411 is located, there is an annular gap 4111 between the plurality of oil holes 4421 and the liquid outlet hole 411, and the annular gap is used for connecting the liquid outlet hole 411 and the plurality of oil holes 4421.

[0088] In one embodiment, the ring-shaped member 442 is screwed into the through hole 410 along with the threaded section 441, and after being screwed into place, there is an annular gap 4111 between the plurality of oil holes 4421 of the ring-shaped member 442 and the liquid outlet hole 411. The cooling liquid in the internal flow channel 430 enters the annular gap 4111 through the liquid outlet hole 411, and the cooling liquid in the annular gap 4111 enters the groove 443 through the plurality of oil holes 4421, and then flows to the shaft hole 111 of the input shaft 110 through the groove 443, thereby cooling the input shaft 110. In one embodiment, when the integrated oil plug 440 is screwed into the through hole 410, even if the screwing is not in place, the cooling liquid can still enter the oil hole 4421 through the liquid outlet hole 411 due to the existence of the annular gap 4111. In one embodiment, the plurality of oil holes 4421 can improve the efficiency of the cooling liquid entering the groove 443, ensure that the cooling liquid can be uniformly and continuously supplied into the groove 443, help to reduce the friction and wear between the ring-shaped member 442 and the through hole 410, and improve the operation efficiency and service life of the power assembly 10. Moreover, the plurality of oil holes 4421 can guide the cooling liquid to flow along a specific path, thereby realizing the optimized distribution and circulation of the cooling liquid, and helping to reduce the waste and leakage of the cooling liquid.

[0089] In the embodiments of the present application, please refer to Figure 8 、 Figure 10 and Figure 16 , Figure 16 is a schematic view of the housing provided by the embodiments of the present application. The outer diameter of the ring-shaped member 442 is smaller than the outer diameter of the threaded section 441. The through hole 410 includes two openings (413, 414) located at the axial ends of the through hole 410. The inner diameter of one of the openings 413 is equal to the inner diameter of the internal thread 412, is greater than the inner diameter of the other opening 414, and is greater than the outer diameter of the portion of the ring-shaped member 442 inserted into the shaft hole of the transmission shaft (110, 120, 130, 210).

[0090] In one embodiment, the outer diameter of the ring-shaped member 442 is smaller than the outer diameter of the threaded section 441. When the integrated oil plug 440 is screwed into the through hole 410, the threaded section 441 forms a similar barrier structure, and an oil barrier structure is formed between the ring-shaped member 442 and the threaded section 441, preventing the cooling liquid from leaking out of the threaded section 441.

[0091] In one embodiment, the through hole 410 extends through the reducer end cover 140 and forms an opening 413 on the outer surface of the reducer end cover 140 and another opening 414 on the inner surface of the reducer end cover 140, the opening 413 and the other opening 414 are located at the axial ends of the through hole 410. Among them: the inner diameter of the opening 413 is equal to the inner diameter of the internal thread 412, the external thread 4411 of the threaded section 441 is engaged with the internal thread 412, and the threaded section 441 can extend into the opening 413; the inner diameter of the opening 413 is greater than the inner diameter of the other opening 414, the threaded section 441 can only pass through the opening 413 and cannot pass through the other opening 414, the threaded section 441 is limited outside the other opening 414, and the annular member 442 with an outer diameter smaller than that of the threaded section 441 can pass through the other opening 414; the inner diameter of the opening 413 is greater than the outer diameter of the part of the annular member 442 inserted into the shaft hole 111 of the input shaft 110, and the part of the annular member 442 can be inserted into the shaft hole 111 of the input shaft 110 through the opening 413 and the other opening 414 in turn, and the shaft hole 111 of the input shaft 110 is supplied with cooling liquid.

[0092] The inner diameters of the two openings (413, 414) of the through hole 410 are inconsistent, which can provide accurate positioning reference for installing the integrated oil plug 440, the opening 413 is used to accommodate the threaded section 441, and the other opening 414 is used to accommodate the annular member 442, which limits the depth of the integrated oil plug 440 screwed into the through hole 410, making the installation process smoother and more accurate. When the through hole 410 is matched with the integrated oil plug 440, the two openings (413, 414) and the threaded section 441 and the annular member 442 can form a more tightly sealed structure, which helps to prevent cooling liquid leakage and external contaminants from entering the inside of the reducer 100 through the through hole 410, thereby maintaining the good working condition of the reducer 100. The reducer end cover 140 has different wall thicknesses at the two openings (413, 414), which is beneficial to optimize the structural strength of the reducer end cover 140 and helps to resist the vibration and impact generated by the power assembly 10 during operation, thereby improving the durability and reliability of the reducer end cover 140.

[0093] In the embodiments of the present application, please continue to refer to Figure 8 , Figure 10 and Figure 16 , the inner diameter of the other opening 414 is greater than the outer diameter of the part of the annular member 442 accommodated in the transmission shaft (110, 120, 130, 210).

[0094] In one embodiment, the inner diameter of the other opening 414 is larger than the outer diameter of the portion of the annular member 442 accommodated within the input shaft 110, and the portion of the annular member 442 accommodated within the input shaft 110 can enter and exit axially through the other opening 414. When assembling or disassembling the integrated oil plug 440, it can be directly screwed into the through hole 410, which helps improve the ease of assembly and disassembly of the integrated oil plug 440.

[0095] In the embodiments of this application, please continue to refer to Figure 8 , Figure 10 and Figure 16 The inner diameter of the other opening 414 is smaller than the inner diameter of the shaft hole of the drive shaft (110, 120, 130, 210).

[0096] In one embodiment, the inner diameter of the other opening 414 is smaller than the inner diameter of the shaft hole 111 of the input shaft 110. During the installation of the integrated oil plug 440, the larger inner diameter of the shaft hole 111 provides more ample insertion space for the integrated oil plug 440, while the larger inner diameter of the shaft hole 111 allows for a certain degree of deviation, enabling the integrated oil plug 440 to be inserted into the appropriate position more smoothly. In another embodiment, the solid wall of a portion of the inner diameter of the other opening 414 acts as a barrier to the flow of coolant, effectively preventing coolant backflow from the integrated oil plug 440 and ensuring that the coolant can flow along the designed path, better lubricating and cooling the various components of the powertrain 10.

[0097] In the embodiments of this application, please refer to Figure 8 , Figure 10 , Figure 12 and Figure 16 The integrated oil plug 440 includes a drain section 446, which is located at both ends of the threaded section 441 along with the annular member 442. The outer diameter of the drain section 446 is larger than the inner diameter of an opening 413. The drain section 446 is located on both sides of the housing 400 along with the drive shafts (110, 120, 130, 210).

[0098] In one embodiment, the integrated oil plug 440 further comprises a leakage section 446, which is fixedly connected to one end of the threaded section 441 and located on the side of the threaded section 441 away from the annular member 442. In one embodiment, the outer diameter of the leakage section 446 is greater than the inner diameter of the opening 413, and the leakage section 446 is located on the axial side of the through hole 410 away from the input shaft 110 when the integrated oil plug 440 is screwed into the through hole 410. When the integrated oil plug 440 is assembled into the through hole 410, the outer diameter of the leakage section 446 is larger, and the leakage section 446 is in contact with the outside of the housing 400, thereby limiting the depth of the integrated oil plug 440 screwed into the through hole 410, avoiding damage or seal failure caused by excessive screwing.

[0099] In one embodiment, the leakage section 446 has a hollow through cavity, and the threaded section 441 has a groove that is in communication with the through cavity to form an outwardly open groove on the integrated oil plug 440, and the groove is provided with a structure suitable for assembly, such as a hexagonal groove, to facilitate assembly of the integrated oil plug 440 and the through hole 410 by an operator using a hexagonal wrench or other assembly tool.

[0100] In one embodiment, a sealing ring 500 is provided between the leakage section 446 and the through hole 410, and the leakage section 446 and the through hole 410 are sealingly connected through the sealing ring 500. In one embodiment, the leakage section 446 comprises an annular groove 4461, and the cooperation between the annular groove 4461 and the sealing ring 500 can form a tight sealing interface, effectively preventing leakage of the cooling liquid. The annular groove 4461 fixes and positions the sealing ring 500, avoiding sliding or rotation of the sealing ring 500 during installation and use, ensuring accurate butt joint between the sealing ring and the sealing groove, and improving the stability and reliability of the sealing ring 500. At the same time, the annular groove 4461 can also effectively prevent the sealing ring 500 from falling off or being damaged when subjected to external force, thereby prolonging the service life of the sealing ring 500. The cooperation between the sealing ring 500 and the annular groove 4461 also makes the installation and disassembly process more convenient. During installation, the sealing ring 500 can be fixed at the desired position by using the integrated oil plug 440. This installation method not only saves time and effort, but also reduces the installation difficulty and cost. During disassembly, the sealing ring 500 can be easily removed from the annular groove 4461 by unscrewing the integrated oil plug 440, which is convenient for maintenance and replacement. In addition, since the sealing ring 500 is easy to replace and simple to install, this cooperation method can also reduce the maintenance cost and time of the equipment.

[0101] In one embodiment, the sealing ring 500 comprises an angular contact sealing ring and an end face contact sealing ring. The angular contact sealing ring can bear radial force and axial force at the same time, and a certain torque, to ensure that the integrated oil plug 440 is completely sealed with the through hole 410; the end face contact sealing ring uses two plane contacts to achieve sealing, and has a good sealing effect on the through hole 410, so that the coolant is not easy to leak.

[0102] In the embodiments of the present application, please continue to refer to Figure 3 and Figure 6 The transmission shaft (110, 120, 130, 210) comprises an input shaft 110 of the speed reducer 100, the annular member 442 is inserted into one end of the input shaft 110 of the speed reducer 100, and one end of a motor shaft 210 of a drive motor 200 of the power assembly 10 is used to insert the other end of the input shaft 110 of the speed reducer 100.

[0103] In one embodiment, the input shaft 110 and the motor shaft 210 are key parts for transmitting and converting power in the power assembly 10, and the annular member 442 is inserted into the input shaft 110 to input the coolant into the shaft hole 111 of the input shaft 110. In one embodiment, the valve 444 in the integrated oil plug 440 can adjust the flow of the coolant into the shaft hole 111 of the input shaft 110 at different temperatures. At low temperature, the amount of coolant entering the shaft hole 111 is reduced, saving the amount of coolant; at high temperature, the amount of coolant entering the shaft hole 111 is increased, rapidly cooling the input shaft 110. In one embodiment, one end of the motor shaft 210 of the drive motor 200 extends into the shaft hole 111 of the input shaft 110 of the speed reducer 100, and the shaft hole 111 of the input shaft 110 of the speed reducer 100 can transmit the coolant to the shaft hole 211 of the motor shaft 210, thereby cooling the motor shaft 210.

[0104] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A powertrain having an integrated oil plug, characterized by, The housing of the power assembly comprises a through hole for communicating the inside and outside of the housing along the axial direction of the power assembly and an integrated oil plug for penetrating through the through hole, the hole wall of the through hole comprises a liquid outlet hole, and the integrated oil plug comprises a threaded section and a ring-shaped member, wherein: the threaded section is used for extending into the through hole and engaging with the internal thread of the through hole, one end of the ring-shaped member is connected with one end of the threaded section in axial end face, and the other end of the ring-shaped member is used for extending into the shaft hole of a transmission shaft in the power assembly; the side wall of the ring-shaped member comprises an oil hole, the inner cavity of the ring-shaped member and the axial end face of the threaded section enclose a groove, the oil hole is used for communicating the liquid outlet hole and the groove along the radial direction of the ring-shaped member, the opening of the groove is located at the other end of the ring-shaped member, the groove cavity is used for accommodating a valve, and the valve is used for adjusting the flow of the cooling liquid in the integrated oil plug.

2. The powertrain of claim 1, wherein, Along the axial direction of the power assembly, the length of the groove cavity of the groove is greater than the length of the part of the ring-shaped member inserted into the shaft hole of the transmission shaft, the groove bottom of the groove is located on the axial side of the oil hole with the threaded section, and the distance between the valve and the groove bottom of the groove is less than or equal to the distance between the oil hole and the groove bottom of the groove.

3. The powertrain of claim 1 or 2, characterized in that The inner side wall of the groove comprises a ring groove, the ring groove is used for being located on the axial side of the opening of the groove with the valve, the ring groove is used for accommodating a snap ring, the radial width of the snap ring is greater than the radial depth of the ring groove, and the inner diameter of the center hole of the snap ring is less than the outer diameter of the valve.

4. The powertrain of any one of claims 1-3, wherein, The valve comprises a valve sleeve, a valve shaft, a ring-shaped valve core, two springs and a temperature sensing assembly, the center hole of the valve sleeve is used for accommodating one of the springs, one end of the valve shaft and the valve core, the center hole of the valve sleeve comprises two inner wall surfaces, one of the inner wall surfaces is used for being located on the axial side of the opening of the groove with the other inner wall surface, the outer diameter of the valve core is used for being less than the inner diameter of the one inner wall surface and equal to the inner diameter of the other inner wall surface; the valve core and the other spring are both sleeved on the valve shaft, the two ends of the one spring are used for respectively fixing the outer peripheral surface of the valve shaft and the one inner wall surface of the valve sleeve, the two ends of the other spring are used for respectively fixing the outer peripheral surface of the valve shaft and one axial end of the valve core, the other spring is used for being located on the axial two sides of the valve core with the one spring, and the temperature sensing assembly is used for being located on the axial two ends of the one spring with the one spring and used for pushing the valve shaft to move towards the one spring.

5. The powertrain of claim 4, wherein, The groove bottom of the groove comprises another groove, the inner diameter of the other groove is less than the inner diameter of the groove, the other groove is used for accommodating one end of the valve shaft and the temperature sensing assembly, and one end of the valve shaft and the groove bottom of the other groove are located on the axial two sides of the temperature sensing assembly.

6. The powertrain of claim 5, wherein, The bottom of the one groove comprises another ring groove for surrounding the other groove, and the oil hole is for penetrating the outer peripheral wall of the other ring groove in the radial direction of the power assembly.

7. The powertrain of any one of claims 1-6, wherein, The threaded section comprises another through hole for penetrating the threaded section in the axial direction of the power assembly, and the valve comprises a solenoid valve, and the other through hole is for accommodating and fixing at least one of the power line and the signal line of the solenoid valve.

8. The powertrain of any one of claims 1-7, wherein, The housing comprises a bearing groove, and the through hole is for penetrating the bottom of the bearing groove in the axial direction of the power assembly, and the bearing groove is for accommodating a bearing for surrounding one end of the transmission shaft, and the length of the portion of the ring member accommodated in the transmission shaft in the axial direction of the power assembly is greater than the length of the one bearing.

9. The powertrain of any of claims 1-8, wherein, The side wall of the ring member comprises a plurality of oil holes for being arranged at intervals in the circumferential direction of the ring member, the inner diameter of the wall surface where the liquid outlet hole is located is greater than the outer diameter of the wall surface where the oil hole is located, and the annular gap between the wall surface where the liquid outlet hole is located and the wall surface where the oil hole is located is for connecting the liquid outlet hole and the plurality of oil holes.

10. The powertrain of any one of claims 1-9, wherein, The outer diameter of the ring member is less than the outer diameter of the threaded section, the through hole comprises two openings at the two axial ends of the through hole, and the inner diameter of one of the openings is equal to the inner diameter of the internal thread, greater than the inner diameter of the other opening, and greater than the outer diameter of the portion of the ring member inserted into the shaft hole of the transmission shaft.

11. The powertrain of claim 10, wherein, The inner diameter of the other opening is greater than the outer diameter of the portion of the ring member accommodated in the transmission shaft.

12. The powertrain of claim 11, wherein, The inner diameter of the other opening is less than the inner diameter of the shaft hole of the transmission shaft.

13. The powertrain of any of claims 10-12, wherein, The integrated oil plug comprises an escape section for being located at the two axial ends of the ring member with respect to the threaded section, the outer diameter of the escape section is greater than the inner diameter of the one opening, and the escape section is for being located at the two axial sides of the transmission shaft with respect to the housing.

14. The powertrain of any one of claims 1-13, wherein, The transmission shaft comprises a reducer input shaft, the ring member is inserted into one end of the reducer input shaft, and one end of the motor shaft of the driving motor of the power assembly is for being inserted into the other end of the reducer input shaft.

15. An electric vehicle characterized by comprising: The power assembly comprises a plurality of wheels and a transmission shaft, and the transmission shaft comprises a threaded section, a ring member, a housing, and an integrated oil plug. The power assembly is for driving one or more of the wheels.

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