Power assembly with integrated oil plug and electric vehicle

Abstract

A power assembly with an integrated oil plug and an electric vehicle are characterized in that a shell of the power assembly comprises a through hole and the integrated oil plug, the through hole is communicated with the interior and the exterior of the shell, the integrated oil plug penetrates 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 an annular piece, and the threaded section extends into the through hole and is meshed with the through hole; one end of the annular piece is connected with the axial end face of one end of the threaded section, and the other end of the annular piece extends into the transmission shaft hole. The side wall of the annular piece comprises an oil hole, an inner cavity of the annular piece and the axial end face of the threaded section enclose a groove, the oil hole communicates with the liquid outlet hole and the groove, a groove opening is located in the other end of the annular piece, a groove cavity of the groove accommodates a valve, and the valve adjusts the flow of cooling liquid. The opening degree of the integrated oil plug is changed through the valve so that the flow of the cooling liquid can be accurately controlled, effective utilization of the cooling liquid under different operation conditions can be achieved, and the integrated oil plug has the dual functions that the through hole is sealed and plugged and an internal flow channel conveys oil into the transmission shaft at different temperatures.

Description

Technical Field

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

[0002] The oil channel of the powertrain is equipped with a valve that can accurately control the flow of coolant to improve the heat dissipation efficiency of the heat-generating components in the powertrain. However, installing a valve in the main oil channel makes the structure of the powertrain complex and increases its volume, and there are problems such as a large number of parts and difficulty in assembly. Summary of the invention

[0003] The present application provides a powertrain with an integrated oil plug, wherein the housing of the powertrain comprises a through hole and an integrated oil plug, wherein the through hole is used to connect the inner and outer sides of the housing along the axial direction of the powertrain, the integrated oil plug is used to pass through the through hole, the hole wall of the through hole comprises a liquid outlet, and the integrated oil plug comprises a threaded segment and an annular member, wherein: the threaded segment is used to extend into the through hole and to engage with the internal thread of the through hole, one end of the annular member is connected to the axial end face of one end of the threaded segment, and the other end of the annular member is used to extend into the axial hole of a transmission shaft in the powertrain; the side wall of the annular member comprises an oil hole, the inner cavity of the annular member and the axial end face of the threaded segment enclose a groove, the oil hole is used to connect the liquid outlet and the one groove along the radial direction of the annular member, the notch of the one groove is located at the other end of the one annular member, the groove cavity of the one groove is used to accommodate a valve, and the valve is used to adjust the flow rate of coolant in the integrated oil plug.

[0004] The present application integrates the threaded section, the annular member and the valve into an integrated oil plug with an integral structure. During assembly, the integrated oil plug only needs to be screwed into the through hole to seal the through hole and connect the oil path between the internal flow channel and the drive shaft. There is no need to assemble multiple parts, which is beneficial to reducing the processing cost of the powertrain and improving assembly efficiency, and is more conducive to the inspection and replacement of parts. By changing the opening of the valve to accurately control the flow of coolant entering the drive shaft, the coolant in the internal flow channel can be effectively used under different operating conditions, so that the integrated oil plug can meet the dual functions of sealing the through hole and transporting oil from the internal flow channel to the drive shaft at different temperatures.

[0005] In a possible implementation, along the axial direction of the power assembly, the length of the groove cavity of the one groove is greater than the length of the portion of the annular member inserted into the shaft hole of the transmission shaft, the groove bottom of the one groove is used to be located on the axial side of the oil hole together with the threaded section, and the distance between the valve and the groove bottom of the one groove is less than or equal to the distance between the oil hole and the groove bottom of the one groove. The valve is installed close to the groove bottom of the groove, which can minimize the overall length of the integrated oil plug, 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 a possible implementation, the inner side wall of the groove includes a ring groove, the ring groove is used to be located on one axial side of the valve together with the notch of the groove, 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 smaller than the outer diameter of the valve. After the valve is installed into the groove from the notch, the snap ring partially protruding from the ring groove can confine the valve in the groove, which helps to improve the structural stability of the integrated oil plug.

[0007] In a possible implementation, the valve includes a valve sleeve, a valve shaft, an annular valve core, two springs and a temperature sensing component, 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 sections of inner wall surfaces, one section of the inner wall surface is used to be located on one axial side of the other section of the inner wall surface with the opening of the one groove, the outer diameter of the valve core is used to be smaller than the inner diameter of the one section of the inner wall surface and equal to the inner diameter of the other section of the inner wall surface; the valve core and the other spring are both annularly sleeved on the valve shaft, the two ends of the one spring are used to respectively fix the outer circumferential surface of the valve shaft and the one inner wall surface of the valve sleeve, the two ends of the other spring are used to respectively fix the outer circumferential surface of the valve shaft and one axial end of the valve core, the other spring is used to be located on both axial sides of the valve core with the one spring, and the temperature sensing component is used to be located on both axial ends of the valve shaft with the one spring and used to push the valve shaft to move toward the one spring. When the operating temperature of the powertrain is too high, the temperature sensing component drives the valve shaft to move toward the notch of a groove, and another spring surrounding the valve shaft pushes the valve core from the space enclosed by another section of the inner wall surface into the space enclosed by one section of the inner wall surface, thereby forming a coolant passage, allowing the coolant to enter the shaft hole of the input shaft through the valve to cool the input shaft. When the powertrain is not running or the operating temperature is low, the temperature sensing component is small in size, and another spring surrounding the valve shaft pushes the valve core to be stuck in the space enclosed by another section of the inner wall surface. The valve throttles to reduce the flow of coolant entering the input shaft, which is conducive to saving coolant consumption.

[0008] In a possible implementation, the groove bottom of the one groove includes another groove, the inner diameter of the other groove is smaller than the inner diameter of the one groove, the other groove is used to accommodate one end of the valve shaft and the temperature sensing component, and the one end of the valve shaft and the groove bottom of the other groove are located on both sides of the axial direction of the temperature sensing component. The temperature sensing component can be completely accommodated in the other groove, and the gap between the temperature sensing component and the other groove is small or does not exist at all. The groove clamps the temperature sensing component, thereby limiting the displacement of the valve shaft during the axial movement, ensuring the precise control of the valve, and effectively improving the stability and reliability of the powertrain operation.

[0009] In a possible implementation, the groove bottom of the one groove includes another annular groove, the another annular groove is used to surround the another groove, and the oil hole is used to penetrate the outer peripheral wall of the another annular groove along the radial direction of the power assembly. The oil hole penetrates the outer peripheral wall of the another annular groove along the radial direction of the power assembly, and the other annular groove is connected with the liquid outlet hole through the oil hole to form a coolant passage. The coolant in the internal flow channel enters the gap through the liquid outlet hole, and the coolant in the gap enters the other annular groove through the oil hole. The temperature sensing component contained in the other annular groove senses the temperature of the coolant and then adjusts the opening of the valve according to demand, thereby accurately controlling the flow of the coolant entering the shaft hole of the input shaft.

[0010] In a possible implementation, the threaded section includes another through hole, and the other through hole is used to penetrate the threaded section along the axial direction of the power assembly, and the valve includes a solenoid valve, and the other through hole is used to accommodate and fix at least one of the power line and the 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. Among them, the power line is used to connect the power supply to provide the solenoid valve with the electrical energy required for operation, and the power line ensures that the solenoid valve can obtain sufficient power to drive the valve to open or close. The signal line is used to transmit a control signal to the solenoid valve to control its switching state. Through the change of current on the signal line, the opening or closing amplitude of the solenoid valve can be controlled, and the flow of coolant entering the input shaft can be accurately controlled.

[0011] In a possible implementation, the housing includes a bearing groove, the through hole is used to penetrate the bottom of the bearing groove along the axial direction of the powertrain, 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 portion of the annular member accommodated in the transmission shaft along the axial direction of the powertrain is greater than the length of the one bearing. The length of the portion of the annular member accommodated in the input shaft along the axial direction of the powertrain is greater than the length of an input shaft bearing, so as to ensure that after the valve is integrated into the integrated oil plug, the increased portion of the integrated oil plug is accommodated on one side of the input shaft, rather than extending to the side close to the through hole, so as to prevent the axial length of the powertrain from increasing, and to prevent the integrated oil plug from occupying too much space of the powertrain and affecting the arrangement of other components and the structure of the vehicle.

[0012] In a possible implementation, the side wall of the annular member includes a plurality of the oil holes, and the plurality of the oil holes are arranged at intervals along the circumference of the annular member. The inner diameter of the wall where the liquid outlet hole is located is greater than the outer diameter of the wall where the oil hole is located. The annular gap between the wall where the liquid outlet hole is located and the wall where the oil hole is located is used to connect the liquid outlet hole and the plurality of the oil holes. The annular member is screwed into the through hole following the threaded section. After being screwed into place, an annular gap exists between the plurality of oil holes of the annular member and the liquid outlet hole. The coolant in the internal flow channel enters the annular gap through the liquid outlet hole. The coolant in the annular gap enters the groove through the plurality of oil holes, and then flows to the shaft hole of the input shaft through the groove, thereby cooling the input shaft. Even if the integrated oil plug is not screwed into place, the coolant 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 coolant entering the groove, ensure that the coolant can be evenly and continuously supplied to the groove, help reduce the friction and wear between the annular member and the through hole, and improve the operating efficiency and life of the powertrain. In addition, multiple oil holes can guide the coolant to flow along a specific path, thereby optimizing the distribution and circulation of the coolant, helping to reduce coolant waste and leakage.

[0013] In a possible implementation, the outer diameter of the annular member is smaller than the outer diameter of the threaded section, the through hole includes two openings, the two openings are located at the axial ends of the through hole, the inner diameter of one opening is equal to the inner diameter of the internal thread, larger than the inner diameter of the other opening, and larger than the outer diameter of the portion of the annular 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 section, and the other opening is used to accommodate the annular member, which limits the depth of the integrated oil plug screwed into the through hole, making the installation process smoother and more accurate. When the through hole and the integrated oil plug are matched, the two openings and the threaded section and the annular member can form a tighter sealing structure, which helps to prevent coolant leakage and external contaminants from entering the reducer through the through hole, thereby maintaining the reducer in good working condition. The reducer end cover has different wall thicknesses at the two openings, which is conducive to optimizing the structural strength of the reducer end cover, helping to resist the vibration and impact generated by the powertrain 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 larger than the outer diameter of the portion of the annular member received in the transmission shaft. The inner diameter of the other opening is larger than the outer diameter of the portion of the annular member received in the input shaft, and the portion of the annular member received in the input shaft can move in and out of the other opening along the axial direction. When assembling or disassembling the integrated oil plug, the integrated oil plug can be screwed directly from the through hole, which helps to improve the convenience of assembling and disassembling 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. During the installation of the integrated oil plug, the larger inner diameter of the shaft hole is conducive to providing a looser 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 inserted into the appropriate position more smoothly. The solid wall of the inner diameter portion of the other opening has a blocking effect on the flow of the coolant, effectively preventing the coolant from leaking back from the integrated oil plug, ensuring that the coolant can flow along the designed path, and better lubricating and cooling the various components of the powertrain.

[0016] In a possible implementation, the integrated oil plug includes a leakage section, the leakage section is used to be located at the axial ends of the threaded section together with the annular member, the outer diameter of the leakage section is larger than the inner diameter of the one opening, and the leakage section is used to be located at the axial sides of the housing together with the transmission shaft. When the integrated oil plug is screwed into the through hole, the leakage section is located on 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 larger, and the leakage section contacts the outer side of the housing, thereby limiting the depth of the integrated oil plug screwed into the through hole, avoiding damage or sealing failure caused by excessive screwing.

[0017] In a possible implementation, the transmission shaft includes a reducer input shaft, the annular member is inserted into one end of the reducer input shaft, and one end of the motor shaft of the drive motor of the powertrain is used to insert 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 powertrain, and the annular member is inserted into the input shaft to input coolant into the shaft hole of the input shaft. The valve in the integrated oil plug can adjust the flow of coolant entering the shaft hole of the input shaft at different temperatures. At low temperatures, the coolant entering the shaft hole is reduced to save the amount of coolant; at high temperatures, the coolant entering the shaft hole is increased to quickly cool the input shaft. One end of the motor shaft of the drive motor extends into the shaft hole of the reducer input shaft, and the shaft hole of the reducer input shaft can transmit coolant to the shaft hole of the motor shaft, thereby cooling the motor shaft.

[0018] The present application also provides an electric vehicle, comprising a plurality of wheels and a powertrain, wherein the powertrain is used to drive one or more of the wheels. The powertrain generates power and transmits the power to the wheels, and the wheels use the power to drive the electric vehicle forward. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of an electric vehicle provided in an embodiment of the present application;

[0020] Figure 2 is a schematic diagram of a powertrain provided in an embodiment of the present application;

[0021] Figure 3 is a schematic diagram of a powertrain provided in an embodiment of the present application;

[0022] Figure 4 is a schematic diagram of a powertrain provided in an embodiment of the present application;

[0023] Figure 5 is an exploded schematic diagram of a powertrain provided in an embodiment of the present application;

[0024] Figure 6 yes Figure 4 Sectional view at AA in the middle;

[0025] Figure 7 is a schematic diagram of a powertrain provided in an embodiment of the present application;

[0026] Figure 8 yes Figure 7 The enlarged view of point Ⅰ in the middle;

[0027] Fig. 9 This is a schematic diagram of an integrated oil plug provided in an embodiment of the present application;

[0028] Fig.10 yes Fig. 9 Cross-section at the middle BB;

[0029] Fig.11 is a schematic diagram of a powertrain provided in an embodiment of the present application;

[0030] Fig.12 It is a schematic diagram of an integrated oil plug provided by the present application;

[0031] Fig.13 This is a schematic diagram of an integrated oil plug provided in an embodiment of the present application;

[0032] Fig.14 It is a schematic diagram of a powertrain provided by the implementation of this application;

[0033] Fig.15 It is a schematic diagram of a powertrain provided by the implementation of this application;

[0034] Fig.16 It is a schematic diagram of a shell provided in an embodiment of the present application. DETAILED DESCRIPTION

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

[0036] When an electric vehicle is running, the powertrain operates efficiently, and the mutual friction and energy conversion of its internal mechanical components will generate a large amount of heat energy. If the heat is not dissipated in a timely and effective manner, it will have an adverse effect on the performance stability, durability and overall efficiency of the powertrain. Therefore, in order to ensure the continued efficient and safe operation of the powertrain, a coolant circulation system is often introduced into the powertrain. The system uses the fluidity and thermal conductivity of the coolant to effectively absorb and take away the excess heat generated inside, thereby maintaining the powertrain within a suitable operating temperature range. However, designing too many parts inside the powertrain to guide the flow of coolant will bring a series of complex and cost issues. Too many parts mean a more complex internal structure, which not only increases the difficulty and precision requirements of processing and manufacturing, increases manufacturing costs, but also may lead to cumbersome and time-consuming assembly processes, and increase the risk of assembly errors. At the same time, the complex internal structure may also affect the smoothness of the coolant flow, reduce the cooling efficiency, and even cause local overheating or uneven cooling in some cases.

[0037] In response to the above problems, an 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 connect the inner and outer sides of the housing along the axial direction of the powertrain, the integrated oil plug is used to pass through the through hole, the hole wall of the through hole includes a liquid outlet, the integrated oil plug includes a threaded section and an annular member, wherein: the threaded section is used to extend into the through hole and to engage with the internal thread of the through hole, one end of the annular member is connected to the axial end face of one end of the threaded section, and the other end of the annular member is used to extend into the axial hole of a transmission shaft in the powertrain; the side wall of the annular member includes an oil hole, the inner cavity of the annular member and the axial end face of the threaded section enclose a groove, the oil hole is used to connect the liquid outlet and a groove along the radial direction of the annular member, the notch of a groove is located at the other end of a ring member, the groove cavity of a groove is used to accommodate a valve, and the valve is used to adjust the flow rate of coolant in the integrated oil plug.

[0038] The present application embodiment provides an electric vehicle 1, see Figure 1 , Figure 1 1 is a schematic diagram of an electric vehicle provided in an 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, and the wheels 20 use the power to drive the electric vehicle 1 forward. In one embodiment, the electric vehicle 1 also includes a power battery 30, which is connected to the powertrain 10. The powertrain 10 receives the electrical energy of the power battery 30 and converts it into mechanical energy, and transmits the mechanical energy to the wheels 20, driving the wheels to rotate so that the electric vehicle 1 moves forward.

[0039] In one embodiment, the electric vehicle 1 includes a front-wheel drive vehicle, a rear-wheel drive vehicle, and a four-wheel drive vehicle. In one embodiment, the powertrain 10 is used to drive the two front wheels of the electric vehicle 1, or to drive the two rear wheels of the electric vehicle 1. In one embodiment, the number of powertrains 10 is two, one of which is used to drive the two front wheels of the electric vehicle 1, and the other is used to drive the two rear wheels of the electric vehicle 1.

[0040] In one 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 one embodiment, the electric vehicle 1 includes a battery electric vehicle (BEV), a hybrid electric vehicle (HEV) and a range extended battery vehicle (REEV).

[0041] In one embodiment, see Figure 2 , Figure 2 1 is a schematic diagram of a powertrain provided in an embodiment of the present application. The powertrain 10 includes a reducer 100 and a drive motor 200. The drive motor 200 converts the electrical energy of the power battery 30 into mechanical energy. The motor shaft 210 of the drive motor 200 generates rotational power. The reducer 100 adjusts the power and enables the power to be effectively transmitted to the wheels 20 to drive the electric vehicle 1 forward. In one embodiment, the reducer 100 includes a single-speed reducer, a two-speed reducer or a transmission.

[0042] In one embodiment, please continue to refer to Figure 2 The reducer 100 includes an input shaft 110, an intermediate shaft 120 and an output shaft 130. The motor shaft 210 is connected to the input shaft 110 by transmission, the gears of the input shaft 110 and the gears of the intermediate shaft 120 are meshed with each other to achieve power transmission, the intermediate shaft 120 is connected to the output shaft 130 and gives power to the output shaft 130, and the output shaft 130 is connected to the wheels 20 by transmission to drive the electric vehicle 1 forward. In one embodiment, the output shaft 130 of the reducer 100 is connected to the two wheels 20 by transmission through two half shafts 300.

[0043] In one 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 referred to as the transmission shafts (110, 120, 130, 210) of the powertrain 10, and at least one transmission shaft in the powertrain 10 includes a shaft hole for transmitting coolant.

[0044] In one embodiment, the input shaft 110 includes a shaft hole 111, and the motor shaft 210 includes another shaft hole 211. The input shaft 110 and the motor shaft 210 are plug-fitted, and the shaft hole 111 of the input shaft 110 is connected to the shaft hole 211 of the motor shaft 210. 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, and the motor shaft 210 of the drive motor 200 extends into the shaft hole 111 of the input shaft 110 of the reducer 100, and the shaft hole 111 of the input shaft 110 of the reducer 100 can transmit coolant to the shaft hole 211 of the motor shaft 210.

[0045] The present application embodiment provides a powertrain 10, see Figure 3 and Figure 4 , Figure 3 A schematic diagram of a powertrain provided in an embodiment of the present application, Figure 4 A schematic diagram of a powertrain provided in an embodiment of the present application, the powertrain 10 includes a housing 400, and the housing 400 is used to accommodate at least one of the reducer 100 or the drive motor 200. In one embodiment, the housing 400 of the powertrain 10 takes the reducer end cover 140 as an example, and the cavity enclosed by the reducer groove provided in the reducer end cover 140 and the housing 400 is used to accommodate the input shaft 110, the intermediate shaft 120 and the output shaft 130.

[0046] In one embodiment, see Figure 5 , Figure 5 An exploded schematic diagram of a power assembly provided in an embodiment of the present application. The housing 400 includes a through hole 410, which penetrates the housing 400 along the axial direction of the power assembly 10, and the through hole 410 connects the inner and outer sides of the housing 400, and forms an opening on the inner surface and the outer surface of the housing 400 respectively. In one embodiment, the through hole 410 is an assembly hole of the reducer end cover 140, and the motor installation tool can pass through the through hole 410 from the outside of the reducer end cover 140, and extend through the through hole 410 into the cavity enclosed by the reducer end cover 140 and the reducer groove provided in the housing 400, and the portion of the motor installation tool extending into the cavity enclosed by the reducer end cover 140 and the reducer groove provided in the housing 400 can cooperate with the motor shaft 210 of the drive motor 200, so as to facilitate the alignment and connection of the motor shaft 210 of the drive motor 200 and the input shaft 110 of the reducer 100. In one embodiment, the through hole 410 includes a circular hole, an elliptical hole, a rectangular hole, etc. The circular hole is easy to be formed by machining methods such as drilling and milling, and is easy to cooperate with the screw structure.

[0047] In one embodiment, see Figure 6 and Figure 7, Figure 6 for Figure 4 The cross-section diagram at AA in the middle. Figure 7 4 is a schematic diagram of a powertrain provided in an embodiment of the present application. The housing 400 includes a bearing groove 420, and the bearing groove 420 is used to fix the bearing of the input shaft 110 of the reducer 100 or the bearing of the motor shaft 210 of the drive motor 200, thereby fixing the input shaft 110 or the motor shaft 210, and the through hole 410 passes through the bottom of the bearing groove 420 along the center line direction thereof. In one embodiment, the bearing groove 420 is used to fix the bearing of the input shaft 110, the center line of the through hole 410 coincides with the axis of the input shaft 110, and the through hole 410 is connected to the shaft hole 111 of the input shaft 110, and the coolant can enter the input shaft 110 from the through hole 410 through the shaft hole 111, thereby cooling the input shaft 110.

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

[0049] In one embodiment, please continue to refer to Figure 2 , Figure 5 and Figure 6The housing 400 includes an integrated oil plug 440. After the transmission shafts (110, 120, 130, 210) are installed, such as the input shaft 110 of the reducer 100 and the motor shaft 210 of the drive motor 200, and the motor installation tooling is pulled out, the through hole 410 is sealed by the integrated oil plug 440. On the one hand, it can prevent the coolant in the housing 400 from leaking out through the through hole 410, and on the other hand, it can prevent impurities from entering the housing 400 through the through hole 410 and contaminating the power assembly 10. In addition, an internal flow channel 430 is provided in the housing 400, and the coolant can be transported to the bearings in the power assembly 10 through the internal flow channel 430. In one embodiment, the coolant flows from the internal flow channel 430 through the liquid outlet hole 411 into the through hole 410, and then flows through the shaft hole into the transmission shaft (110, 120, 130, 210) to cool the transmission shaft (110, 120, 130, 210). Taking cooling the input shaft 110 and the motor shaft 210 as an example, the coolant in the internal flow channel 430 flows out through the liquid outlet hole 411, enters the through hole 410, and then flows through the shaft hole 111 of the input shaft 110 into the input shaft 110 to cool the input shaft 110; then, the coolant flows through the shaft hole 111 of the input shaft 110 into the shaft hole 211 of the motor shaft 210 to cool the motor shaft 210.

[0050] In one embodiment, see Figure 8 , Figure 8 for Figure 7 In the enlarged view at point Ⅰ, the integrated oil plug 440 is used to pass through the through hole 410 and contact the inner circumferential surface of the through hole 410. The through hole 410 is used to accommodate and fix the integrated oil plug 440. A sealing ring 500 is provided between the through hole 410 and the integrated oil plug 440. The through hole 410 and the integrated oil plug 440 are sealed and connected via the sealing ring 500.

[0051] In one embodiment, see Figure 8 and Fig. 9 , Fig. 9A schematic diagram of an integrated oil plug provided in an embodiment of the present application, the integrated oil plug 440 includes 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 powertrain 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 one embodiment, the threaded segment 441 and the ring member 442 can be made of a material, for example, both are metal materials, and the threaded segment 441 and the ring member 442 can be connected to form 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 one embodiment, the threaded segment 441 and the ring member 442 are riveted, and the riveting is conducive to enhancing the connection strength between the threaded segment 441 and the ring member 442, which helps to improve the shock resistance and fatigue resistance of the integrated oil plug 440, and improve the stability of the powertrain 10.

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

[0053] In one embodiment, the annular member 442 is screwed into the through hole 410 following the threaded section 441, and the axial direction of the annular member 442 is parallel to or coincides with the axial direction of the transmission shaft (110, 120, 130, 210) in the power assembly 10. In one embodiment, the diameter of the other end of the annular 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 annular member 442 can be inserted into the shaft hole of the transmission shaft (110, 120, 130, 210).

[0054] In one embodiment, please continue to refer to Figure 7 , Figure 8 and Fig. 9, the annular member 442 includes an oil hole 4421, the oil hole 4421 is located on the outer circumference of the annular member 442 and penetrates the outer circumference of the annular member 442, there is a gap 4111 between the oil hole 4421 and the liquid outlet hole 411, and the gap 4111 connects the oil hole 4421 and the liquid outlet hole 411. In one embodiment, the inner cavity 4422 of the annular member 442 and the axial end surface of the threaded section 441 enclose a groove 443, the notch 4431 of the groove 443 is located on the axial side of the annular member 442 away from the threaded section 441, and the oil hole 4421 connects the gap 4111 and the groove 443. In one embodiment, the annular member 442 includes a center hole 4423, the center hole 4423 is located on the axial side of the annular member 442 away from the threaded section 441, and the center hole 4423 connects the groove 443 and the shaft hole of the transmission shaft (110, 120, 130, 210).

[0055] The coolant in the internal flow channel 430 enters the gap 4111 through the liquid outlet 411, enters the groove 443 in the ring 442 through the oil hole 4421, and then flows through the center 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 one embodiment, see Figure 8 and Fig.10 , Fig.10 for Fig. 9 The cross-sectional view is taken at BB in the middle. The integrated oil plug 440 includes a valve 444, which is accommodated in the groove cavity 4432 of the groove 443, and the valve 444 is fixedly connected to the inner wall of the groove 443. In one embodiment, the inner wall of the groove 443 includes a side wall 4433 and a groove bottom 4434. In one embodiment, the axial length of the valve 444 is smaller than the axial length of the groove cavity 4432, and the radial width of the valve 444 is smaller than the radial width of the groove cavity 4432. The valve 444 can be completely accommodated in the groove cavity 4432, so as to avoid the integrated oil plug 440 being too large to affect the assembly with the through hole 410 and the delivery of the coolant.

[0057] In one embodiment, valve 444 is used to adjust the flow of coolant in integrated oil plug 440. In one embodiment, valve 444 is a temperature-sensitive valve, which can sense temperature changes and automatically adjust the opening of valve 444 accordingly. At low temperatures, the opening of valve 444 decreases, thereby reducing the flow of coolant output to the transmission shaft (110, 120, 130, 210) and saving coolant; at high temperatures, the opening of valve 444 increases, thereby increasing the flow of coolant output to the transmission shaft (110, 120, 130, 210), rapidly cooling the transmission shaft (110, 120, 130, 210) and ensuring the smooth operation of power assembly 10. In one embodiment, valve 444 includes a mechanical valve or a solenoid valve. The structure of the mechanical valve is relatively simple, and the mechanical parts are closely matched, so it has high stability and can maintain a stable control effect for a long time; the solenoid valve adopts electromagnetic principle to realize control, responds quickly, and can respond to temperature changes in a short time.

[0058] In one embodiment, Figure 6 , Figure 7 and Fig.10 The integrated oil plug 440 is a combination of multiple cylindrical structures along the axial direction, and the circumferential sidewall is the circumferential surface of multiple cylindrical segments. In one embodiment, the integrated oil plug 440 has a threaded segment 441, a ring member 442 and a valve 444, forming an integrated structure.

[0059] The threaded section 441 can mesh with the internal thread 412 on the hole wall of the through hole 410, and the threaded section 441 can be fixed in the through hole 410 and fixedly connected to the inner wall of the through hole 410 to seal the through hole 410. The ring member 442 has an oil hole 4421 and a center hole 4423. The oil hole 4421 is located on the outer peripheral surface of the ring member 442 and communicates with the liquid outlet 411. The center hole 4423 extends along the axial side of the ring member 442 away from the threaded section 441 to form a cooling oil passage, and the oil hole 4421 is communicated with the center hole 4423 through the groove 443.

[0060] When the operating temperature of the power assembly 10 is high, the coolant transported 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 through the gap 4111 to enter the groove 443 of the annular member 442. At this time, the opening of the valve 444 in the groove 443 is relatively large, and a large amount of coolant can flow through the center hole 4423 through the groove 443 and enter 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 reducer 100, to cool the rotating shaft of the reducer 100. When the operating temperature of the power assembly 10 is low, the valve 444 in the groove 443 is opened less or is completely closed, and a small amount or no coolant can flow through the groove 443 through the center hole 4423 to cool the drive shaft (110, 120, 130, 210), saving cooling oil consumption at low temperatures.

[0061] In the embodiment of the present application, the threaded section 441, the annular member 442 and the valve 444 are integrated into an integrated oil plug 440 of an integral structure. When assembling, it is only necessary to screw the integrated oil plug 440 into the through hole 410 to seal the through hole 410 and connect the oil path between the internal flow channel 430 and the transmission shaft (110, 120, 130, 210). There is no need to assemble multiple parts, which is beneficial to reducing the processing cost of the power assembly 10 and improving the assembly efficiency, and is more conducive to the maintenance and replacement of parts. The opening of the valve 444 is changed to accurately control the flow rate of the coolant entering the transmission shaft (110, 120, 130, 210), so as to effectively utilize the coolant in the internal flow channel 430 under different motion conditions, so that the integrated oil plug 440 can meet the dual functions of sealing the through hole 410 and the internal flow channel 430 delivering oil (110, 120, 130, 210) to the transmission shaft at different temperatures.

[0062] In this application example, 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 a groove 443 is greater than the length of the portion of the ring 442 inserted into the axial hole of the transmission shaft (110, 120, 130, 210), the groove bottom 4434 of a groove 443 is used to be located on the axial side of the oil hole 4421 together with the threaded section 441, and the distance between the valve 444 and the groove bottom 4434 of a groove 443 is less than or equal to the distance between the oil hole 4421 and the groove bottom 4434 of a groove 443.

[0063] In one embodiment, the groove 443 in the annular member 442 has a 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 liquid outlet hole 411 and the oil hole 4421 can be connected through the gap 4111 to form a coolant passage.

[0064] In one embodiment, see Figure 8 , Fig. 9 and Fig.10 The annular member 442 is a multi-section cylindrical structure along the axial direction of the power assembly 10, wherein: the diameter of a section 4435 of the annular member 442 is greater than the diameter of the shaft hole 111 of the input shaft 110, and the section 4435 of the annular member 442 is located outside the shaft hole 111 of the input shaft 110 and close to the axial side of the threaded section 441, and the oil hole 4421 is located on the outer peripheral surface of the section 4435 of the annular member 442, and the coolant can enter the gap 4111 through the liquid outlet hole 411, and the coolant in the gap 4111 enters the groove cavity 4432 of the groove 443 through the oil hole 4421; the diameter of another section 4436 of the annular member 442 is less than or equal to the diameter of the shaft hole 111 of the input shaft 110, so as to facilitate insertion into the shaft hole of the input shaft 110 to transport the coolant to the input shaft 110.

[0065] In one embodiment, see Figure 8 and Fig.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 along the axial direction 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 coolant can enter the groove 443 through the oil hole 4422. The valve 444 accommodated in the groove 443 can adjust the coolant flow rate according to different temperatures. In one embodiment, one end of the valve 444 is fixed on the groove bottom 4434 of the groove 443. The fixing method includes welding, gluing and bolts.

[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, and prevent the valve 444 from affecting the installation of the input shaft 110 and the motor shaft 210, thereby ensuring that the coolant 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 groove bottom 4434 of the groove 443, and the fixing method includes welding, gluing, bolts, etc. One end of the valve 444 is directly fixed to the groove bottom 4434 of the groove 443, which can enhance the overall rigidity of the integrated oil plug 440 and prevent loosening or leakage caused by vibration or pressure fluctuation of the power assembly 10. In addition, directly fixing the valve 444 makes the valve 444 more stable when it is subjected to coolant pressure, reducing fatigue damage caused by vibration.

[0068] This application is in progress, please continue to refer to Figure 8 and Fig.10 The inner side wall 4433 of a groove 443 includes a circle of annular groove 4437, and the annular groove 4437 is used to be located on the axial side of the valve 444 with the notch 4431 of a groove 443. The annular groove 4437 is used to accommodate a retaining ring 445, and the radial width of the retaining ring 445 is greater than the radial depth of the annular groove 4437. The inner diameter of the center hole 4451 of the retaining ring 445 is smaller than the outer diameter of a valve 444.

[0069] In one embodiment, the inner side wall 4433 of the groove 443 includes a circle of annular grooves 4437, which extend along the circumference of the inner side wall 4433. The annular groove 4437 is located on the axial side of the valve 444 close to the notch 4431 of the groove 443, and the notch of the annular groove 4437 faces the central axis of the groove 443.

[0070] In one embodiment, the annular groove 4437 is used to accommodate the snap ring 445. In one embodiment, the snap ring 445 is an elastic C-shaped ring, and the snap ring 445 can be assembled in the annular groove 4437 by squeezing the snap ring 445. The snap ring 445 has a certain elasticity, and the opening part of the snap ring 445 will be tightly attached to the annular 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 annular groove 4437, and the snap ring 445 at least partially protrudes from the annular groove 4437. In one embodiment, the inner diameter of the center hole 4451 of the snap ring 445 is smaller than the outer diameter of the valve 444. After the valve 444 is installed into the groove 443 from the notch 4431, the snap ring 445 partially protruding from the annular groove 4437 can confine the valve 444 in the groove 443, which helps to improve the structural stability of the integrated oil plug 440.

[0072] In this application example, please continue to refer to Fig.10The valve 444 comprises a valve sleeve 4441, a valve shaft 4442, an annular valve core 4443, two springs (4444, 4445) and a temperature sensing component 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 comprises two sections of inner wall surfaces (4448, 4449), wherein a notch 4431 of one section of the inner wall surface 4448 is located on one axial side of the other section of the inner wall surface 4449 and is smaller than the inner diameter of one section of the inner wall surface 4448 and equal to the inner diameter of the other section of the inner wall surface 4449. The inner diameter of the inner wall surface 4449 of the segment; the valve core 4443 and another spring 4445 are both annularly sleeved on the valve shaft 4442, the two ends of a spring 4444 are used to respectively fix the outer circumference of the valve shaft 4442 and an inner wall surface of the valve sleeve 4441, the two ends of another spring 4445 are used to respectively fix the outer circumference of the valve shaft 4442 and one axial end of the valve core 4443, the other spring 4445 is used to be located on both axial sides of the valve core 4443 with a spring 4444, the temperature sensing component 4446 is used to be located on both axial sides of the valve shaft 4442 with a spring 4444, and is used to push the valve shaft 4442 to move toward a spring 4444.

[0073] In one embodiment, the center hole of the valve sleeve 4441 is used to accommodate a 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 center hole of the valve sleeve 4441 to adjust the opening of the valve 444 to control the flow of the coolant. In one embodiment, the center hole of the valve sleeve 4441 includes an inner wall surface 4448 at one end and an inner wall surface 4449 at the other end. One section of the inner wall surface 4448 is axially close to a notch 4431 of a groove 443, and the other section of the inner wall surface 4449 is 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 one section of the inner wall surface 4448 and is equal to the inner diameter of another section of the inner wall surface 4449. The valve core 4443 can be expanded and contracted in the space enclosed by one section of the inner wall surface 4448 and the space enclosed by the other end inner wall surface 4449. The valve core 4443 can fit tightly with the other section of the inner wall surface, and can effectively prevent the circulation of coolant at low temperatures. The valve core 4443 will not be stuck at the axial end of one section of the inner wall surface 4448 close to the other section of the inner wall surface 4449, thereby avoiding uneven force on the valve 444, which may lead to structural instability and shortened service life of the integrated oil plug 440.

[0074] In one embodiment, see Figure 8, the valve core 4443 and another spring 4445 are sleeved on the valve shaft 4442, and another spring 4445 is used to be located with a spring 4444 on both sides of the axial direction of the valve core 4443. In one embodiment, one end of a spring 4444 is used to fix the outer peripheral surface of the portion of the valve shaft 4442 close to the axial end of the notch 4431 of a groove 443, and the other end of a spring 4444 is used to fix the inner wall surface of the portion of the valve sleeve 4441 close to the axial end of the notch 4431 of a groove 443. At low temperatures, a spring 4444 applies a pre-tightening force to the valve shaft 4442, so that the valve core 4443 on the valve shaft 4442 is closely attached to another section of the inner wall surface 4449; at high temperatures, a pressure is applied to the valve sleeve 4441, so that the valve core 4443 forms a coolant passage in the space enclosed by a section of the inner wall surface 4448. In one embodiment, one end of another spring 4445 is used to fix the outer circumferential surface of the valve shaft 4442, and the other end of another spring 4445 is used to fix the axial end of the valve core 4443 close to the threaded section 441, and another spring 4445 is used to push the valve core 4443 to move back and forth in the axial direction.

[0075] In one embodiment, the temperature sensing component 4446 is located at one axial end of the valve shaft 4442 close to the threaded section 441 and is fixedly connected to the valve shaft 4442. Figure 8 When the operating temperature of the power assembly 10 is too high, the temperature sensing component 4446 drives the valve shaft 4442 to move toward the notch 4431 of the groove 443, and another spring 4445 surrounding the valve shaft 4442 pushes the valve core 4443 from the space enclosed by the other inner wall surface 4449 to enter the space enclosed by the inner wall surface 4448, thereby forming a coolant passage, so that the coolant can enter the shaft hole 111 of the input shaft 110 through the valve 444 to cool the input shaft 110. Please refer to Fig.11 , Fig.11 It is a schematic diagram of the powertrain provided in an embodiment of the present application. When the powertrain 10 is not in operation or the operating temperature is low, the temperature sensing component 4446 is relatively small in size, and another spring 4445 surrounding the valve shaft 4442 pushes the valve core 4443 to be stuck in the space enclosed by another section of the inner wall surface 4449. The valve 444 throttles to reduce the flow of coolant entering the input shaft 110, which is beneficial to saving the amount of coolant.

[0076] In one embodiment, the temperature sensing component 4446 can push the valve shaft 4442 to move according to the change of temperature, thereby adjusting the opening and closing state of the valve 444. This automatic adjustment capability enables the valve 444 to maintain effective flow control in different temperature environments. In one embodiment, the temperature sensing component 4446 includes paraffin, which expands when heated and pushes the valve shaft 4442 to move toward a notch 4431 of a groove 443, and contracts at low temperatures, pushing the valve shaft 4442 to move toward the threaded section 441.

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

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

[0079] In one embodiment, one end of the valve shaft 4442 is fixedly connected to the temperature sensing component 4446. In one embodiment, the temperature sensing component 4446 can be completely accommodated in another groove 4438, and the gap between the temperature sensing component 4446 and the other groove 4438 is small or does not exist at all. The groove 4438 clamps the temperature sensing component 4446, thereby limiting the displacement of the valve shaft 4442 during the axial movement, ensuring the precise control of the valve 444, and effectively improving the stability and reliability of the operation of the power assembly 10.

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

[0081] In one embodiment, the groove bottom 4434 of a groove 443 includes another annular groove 4439, which extends circumferentially along the inner wall surface of the groove 443, 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 another annular groove 4439 along the radial direction of the power assembly 10, and the other annular groove 4439 is connected with the liquid outlet hole 411 through the oil hole 4421 to form a coolant passage. The coolant in the internal flow channel 430 enters the gap 4111 through the liquid outlet hole 411, and the coolant in the gap 4111 enters the other annular groove 4439 through the oil hole 4421. The temperature sensing component 4446 accommodated in the other annular groove 4439 senses the temperature of the coolant and adjusts the opening of the valve 444 according to demand, thereby accurately controlling the flow of coolant entering the shaft hole 111 of the input shaft 110.

[0082] In the present application, please refer to Fig.12 , Fig.13 , Fig.14 and Fig.15 , Fig.12 This is a schematic diagram of an integrated oil plug provided by the present application. Fig.13 is a schematic diagram of an integrated oil plug provided in an embodiment of the present application. Fig.14 is a schematic diagram of a powertrain provided by the present application. Fig.15 It is a schematic diagram of the power assembly provided by the implementation of the present application, the threaded segment 441 includes another through hole 4412, and the other through hole 4412 is used to penetrate the threaded segment 441 along the axial direction of the power assembly 10, 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 section 441 is penetrated by another through hole 4412 along the axial direction of the power assembly 10, and the other through hole 4412 can be used to accommodate other parts. 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 signal line of the solenoid valve 4447 to ensure the normal operation of the solenoid valve 4447. Among them, the power line is used to connect the power supply to provide the solenoid valve 4447 with the electrical energy required for operation, and the power line ensures that the solenoid valve 4447 can obtain enough power to drive the valve to open or close. The signal line is used to transmit a control signal to the solenoid valve 4447 to control its switching state. Through the change of current on the signal line, the opening or closing amplitude of the solenoid valve 4447 can be controlled, and the flow rate of the coolant entering the input shaft 110 can be accurately controlled.

[0084] In this application example, please continue to refer to Figure 7 and Figure 8 The housing 400 includes a bearing groove 420, and the through hole 410 is used to penetrate the bottom of the bearing groove 420 along the axial direction of the power assembly 10. The bearing groove 420 is used to accommodate a bearing 460. The bearing 460 is used to surround one end of the transmission shaft (110, 120, 130, 210). The length of the portion of the annular member 442 accommodated in the transmission shaft (110, 120, 130, 210) along the axial direction of the power assembly 10 is greater than the length of one bearing 460. For example: an input shaft bearing groove 420 is provided on the inner side of the reducer end cover 140, and the input shaft bearing groove 420 surrounds the periphery of the through hole 410. The input shaft bearing groove 420 is used to accommodate the 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 to fix one end of the input shaft 110. The through hole 410 passes through the bottom of the input shaft bearing groove 420 along its center line direction, and the center 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 portion of the axial annular member 442 along the powertrain 10 accommodated in the input shaft 110 is greater than the length of an input shaft bearing 460, to ensure that after the valve 444 is integrated into the integrated oil plug 440, the increased portion of the integrated oil plug 440 is accommodated on one side of the input shaft 110, rather than extending to the side close to the through hole 410, thereby preventing the axial length of the powertrain 10 from increasing and preventing the integrated oil plug 440 from occupying too much space in the powertrain 10 and affecting the arrangement of other components and the structure of the entire vehicle.

[0086] In this application example, please continue to refer to Figure 6 , Figure 7 and Fig.12 The side wall of the annular member 442 includes a plurality of oil holes 4421, and the plurality of oil holes 4421 are arranged at intervals along the circumference of the annular member 442. The inner diameter of the wall where the liquid outlet hole 411 is located is greater than the outer diameter of the wall where the oil hole 4421 is located. The annular gap 4111 between the wall where the liquid outlet hole 411 is located and the wall where the oil hole 4421 is located is used to connect the liquid outlet hole 411 and the plurality of oil holes 4421.

[0087] In one embodiment, the plurality of oil holes 4421 are arranged axially at intervals along the outer circumferential surface of the annular member 442, the outer diameter of the portion of the annular member 442 where the plurality of oil holes 4421 are located is smaller than the inner diameter of the through hole 410 where the liquid outlet hole 411 is located, and an annular gap 4111 exists between the plurality of oil holes 4421 and the liquid outlet hole 411, and the annular gap is used to connect the liquid outlet hole 411 and the plurality of oil holes 4421.

[0088] In one embodiment, the annular member 442 follows the threaded section 441 and is screwed into the through hole 410. After being screwed into place, an annular gap 4111 exists between the multiple oil holes 4421 of the annular member 442 and the liquid outlet hole 411. The coolant in the internal flow channel 430 enters the annular gap 4111 through the liquid outlet hole 411. The coolant in the annular gap 4111 enters the groove 443 through the multiple 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 it is not screwed into place, due to the existence of the annular gap 4111, the coolant can also enter the oil hole 4421 through the liquid outlet hole 411. In one embodiment, the plurality of oil holes 4421 can improve the efficiency of coolant entering the groove 443, ensure that the coolant can be evenly and continuously supplied to the groove 443, help reduce the friction and wear between the ring 442 and the through hole 410, and improve the operating efficiency and life of the power assembly 10. In addition, the plurality of oil holes 4421 can guide the coolant to flow along a specific path, thereby achieving optimized distribution and circulation of the coolant, and helping to reduce coolant waste and leakage.

[0089] In the present application, please refer to Figure 8 , Fig.10 and Fig.16 , Fig.16 It is a schematic diagram of a shell provided in an embodiment of the present application, wherein the outer diameter of the annular member 442 is smaller than the outer diameter of the threaded segment 441, and the through hole 410 includes two openings (413, 414), and the two openings (413, 414) are located at both axial ends of the through hole 410, wherein the inner diameter of one opening 413 is equal to the inner diameter of the internal thread 412, is larger than the inner diameter of the other opening 414, and is larger than the outer diameter of the portion of the annular member 442 inserted into the shaft hole of the transmission shaft (110, 120, 130, 210).

[0090] In one embodiment, the outer diameter of the annular member 442 is smaller than the outer diameter of the threaded segment 441. When the integrated oil plug 440 is screwed into the through hole 410, the threaded segment 441 forms another retaining wall-like structure, forming an oil retaining structure between the annular member 442 and the threaded segment 441 to prevent the coolant from leaking from the threaded segment 441.

[0091] In one embodiment, the through hole 410 passes 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. The opening 413 and the other opening 414 are located at two axial ends of the through hole 410 . Among them: the inner diameter of one opening 413 is equal to the inner diameter of the internal thread 412, the external thread 4411 of the threaded segment 441 is meshed with the internal thread 412, and the threaded segment 441 can extend into one opening 413; the inner diameter of one opening 413 is greater than the inner diameter of the other opening 414, the threaded segment 441 can only pass through one opening 413 and cannot pass through the other opening 414, the threaded segment 441 is restricted outside the other opening 414, and the ring member 442 with an outer diameter smaller than the outer diameter of the threaded segment 441 can pass through the other opening 414; the inner diameter of one opening 413 is greater than the outer diameter of the portion of the ring member 442 inserted into the shaft hole 111 of the input shaft 110, and the portion of the ring member 442 can be inserted into the shaft hole 111 of the input shaft 110 through one opening 413 and the other opening 414 in sequence, so as to transport the coolant to the shaft hole 111 of the input shaft 110.

[0092] The inner diameters of the two openings (413, 414) of the through hole 410 are inconsistent, which can provide an accurate positioning reference for installing the integrated oil plug 440. One opening 413 is used to accommodate the threaded section 441, and the other opening 414 is used to accommodate the ring 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 and the integrated oil plug 440 are matched, the two openings (413, 414) and the threaded section 441 and the ring 442 can form a tighter sealing structure, which helps to prevent coolant leakage and external contaminants from entering 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 conducive to optimizing the structural strength of the reducer end cover 140, helping to resist the vibration and impact generated by the power assembly 10 during operation, and improving the durability and reliability of the reducer end cover 140.

[0093] In this application example, please continue to refer to Figure 8 , Fig.10 and Fig.16 The inner diameter of the other opening 414 is larger than the outer diameter of the portion of the annular member 442 received 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 in the input shaft 110, and the portion of the annular member 442 accommodated in the input shaft 110 can axially enter and exit from the other opening 414. When assembling or disassembling the integrated oil plug 440, the integrated oil plug 440 can be screwed directly from the through hole 410, which helps to improve the convenience of assembling and disassembling the integrated oil plug 440.

[0095] In the embodiments of this application, please continue to refer to Figure 8 , Fig.10 and Fig.16 The inner diameter of the other opening 414 is smaller than the inner diameter of the shaft hole of the transmission 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 is conducive to providing a looser insertion space for the integrated oil plug 440, and the larger inner diameter of the shaft hole 111 can allow a certain degree of deviation, so that the integrated oil plug 440 can be inserted into the appropriate position more smoothly. In one embodiment, the solid wall surface of the inner diameter of the other opening 414 blocks the flow of the coolant, effectively preventing the coolant from leaking back from the integrated oil plug 440, ensuring that the coolant can flow along the designed path, and better lubricate and cool the various components of the powertrain 10.

[0097] In the present application, please refer to Figure 8 , Fig.10 , Fig.12 and Fig.16 The integrated oil plug 440 includes a leakage section 446, which is used to be located at the axial ends of the threaded section 441 together with the annular member 442. The outer diameter of the leakage section 446 is greater than the inner diameter of an opening 413. The leakage section 446 is used to be located at the axial sides of the housing 400 together with the transmission shaft (110, 120, 130, 210).

[0098] In one embodiment, the integrated oil plug 440 further includes a leakage section 446, which is used to fix one end of the threaded section 441, and the leakage section 446 is 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 an opening 413, and when the integrated oil plug 440 is screwed into the through hole 410, 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 assembled into the through hole 410, the outer diameter of the leakage section 446 is larger, and the leakage section 446 contacts the outer side of the housing 400, thereby limiting the depth of the integrated oil plug 440 screwed into the through hole 410, thereby avoiding damage or sealing 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, and the groove and the through cavity are connected to form a groove opening outward on the integrated oil plug 440, and a structure suitable for assembly is provided in the groove, such as a hexagonal groove, which is convenient for operators to use assembly tools such as hexagonal wrenches to assemble the integrated oil plug 440 and the through hole 410.

[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 sealed and connected by the sealing ring 500. In one embodiment, the leakage section 446 includes 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 the leakage of the coolant. The annular groove 4461 fixes and positions the sealing ring 500, avoids the sliding or rotation of the sealing ring 500 during installation and use, ensures the accurate docking between the sealing ring and the sealing groove, and improves 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 extending the service life of the sealing ring 500. The cooperation design of the sealing ring 500 and the annular groove 4461 also makes the installation and disassembly process more convenient. During installation, it is only necessary to fix the sealing ring 500 at the desired position using the integrated oil plug 440. This installation method not only saves time and effort, but also reduces the difficulty and cost of installation. When disassembling, it is only necessary to unscrew the integrated oil plug 440 to easily remove the sealing ring 500 from the annular groove 4461, which is convenient for maintenance and replacement. In addition, since the sealing ring 500 is easy to replace and install, this matching method can also reduce the maintenance cost and time of the equipment.

[0101] In one embodiment, the sealing ring 500 includes an angular contact sealing ring and an end face contact sealing ring. The angular contact sealing ring can simultaneously withstand radial force and axial force, as well as a certain torque, to ensure that the integrated oil plug 440 and the through hole 410 are completely sealed; the end face contact sealing ring uses the contact of two planes to achieve sealing, has a good sealing effect on the through hole 410, and prevents the coolant from leaking.

[0102] In this application example, please continue to refer to Figure 3 and Figure 6 The transmission shaft (110, 120, 130, 210) includes the input shaft 110 of the reducer 100, the annular member 442 is inserted into one end of the input shaft 110 of the reducer 100, and one end of the motor shaft 210 of the driving motor 200 of the power assembly 10 is used to be inserted into the other end of the input shaft 110 of the 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 powertrain 10, and a ring 442 is inserted into the input shaft 110 to input 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 coolant entering the shaft hole 111 of the input shaft 110 at different temperatures. At low temperatures, the coolant entering the shaft hole 111 is reduced to save the amount of coolant; at high temperatures, the coolant entering the shaft hole 111 is increased to quickly cool 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 reducer 100, and the shaft hole 111 of the input shaft 110 of the reducer 100 can transmit 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, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A powertrain with an integrated oil plug, characterized in that: The housing of the power assembly includes a through hole and an integrated oil plug, wherein the through hole is used to connect the inner and outer sides of the housing along the axial direction of the power assembly, and the integrated oil plug is used to pass through the through hole, and the hole wall of the through hole includes a liquid outlet hole, and the integrated oil plug includes a threaded section and a ring member, wherein: The threaded section is used to extend into the through hole and to engage with the internal thread of the through hole, one end of the annular member is connected to the axial end surface of one end of the threaded section, and the other end of the annular member is used to extend into the shaft hole of a transmission shaft in the power assembly; The side wall of the annular member includes an oil hole, and the inner cavity of the annular member and the axial end surface of the threaded section enclose a groove. The oil hole is used to connect the liquid outlet and the groove along the radial direction of the annular member. The notch of the groove is located at the other end of the annular member. The groove cavity of the groove is used to accommodate a valve, and the valve is used to adjust the flow rate of the coolant in the integrated oil plug.

2. The powertrain according to claim 1, characterized in that: Along the axial direction of the power assembly, the length of the groove cavity of the one groove is greater than the length of the portion of the annular member inserted into the axial hole of the transmission shaft, the groove bottom of the one groove is used to be located on the axial side of the oil hole together with the threaded section, and the distance between the valve and the groove bottom of the one groove is less than or equal to the distance between the oil hole and the groove bottom of the one groove.

3. The powertrain according to claim 1 or 2, characterized in that The inner side wall of the groove includes a ring groove, and the ring groove is used to be located on the axial side of the valve together with the notch of the groove. The ring groove is used to accommodate a retaining ring, and the radial width of the retaining ring is greater than the radial depth of the ring groove. The inner diameter of the center hole of the retaining ring is smaller than the outer diameter of the valve.

4. The powertrain according to any one of claims 1 to 3, characterized in that: The valve comprises a valve sleeve, a valve shaft, an annular valve core, two springs and a temperature sensing component, the central hole of the valve sleeve is used to accommodate one of the springs, one end of the valve shaft and the valve core, the central hole of the valve sleeve comprises two sections of inner wall surfaces, one section of the inner wall surface is used to be located at one axial side of the other section of the inner wall surface with the opening of the one groove, and the outer diameter of the valve core is used to be smaller than the inner diameter of the one section of the inner wall surface and equal to the inner diameter of the other section of the 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 to respectively fix the outer circumference of the valve shaft and the one inner wall of the valve sleeve, the two ends of the other spring are used to respectively fix the outer circumference of the valve shaft and one axial end of the valve core, the other spring is used to be located on both axial sides of the valve core together with the one spring, and the temperature sensing component is used to be located on both axial sides of the valve shaft together with the one spring, and is used to push the valve shaft to move toward the one spring.

5. The powertrain according to claim 4, characterized in that: The bottom of the one groove includes another groove, the inner diameter of the other groove is smaller than the inner diameter of the one groove, the other groove is used to accommodate one end of the valve shaft and the temperature sensing component, and the one end of the valve shaft and the bottom of the other groove are located on both axial sides of the temperature sensing component.

6. The powertrain according to claim 5, characterized in that: The groove bottom of the one groove comprises another annular groove, the another annular groove is used to surround the other groove, and the oil hole is used to penetrate the outer peripheral wall of the another annular groove along the radial direction of the power assembly.

7. The power assembly according to any one of claims 1 to 6, characterized in that: The threaded section includes another through hole, which is used to penetrate the threaded section along the axial direction of the power assembly. The valve includes a solenoid valve, and the other through hole is used to accommodate and fix at least one of the power line and the signal line of the solenoid valve.

8. The powertrain according to any one of claims 1 to 7, characterized in that: The housing includes a bearing groove, the through hole is used to penetrate the bottom of the bearing groove along the axial direction of the powertrain, the bearing groove is used to accommodate a bearing, and the bearing is used to surround one end of the transmission shaft. The length of the part of the annular member accommodated in the transmission shaft along the axial direction of the powertrain is greater than the length of the bearing.

9. The power assembly according to any one of claims 1 to 8, characterized in that: The side wall of the annular member includes a plurality of oil holes, and the plurality of oil holes are arranged at intervals along the circumference of the annular member. The inner diameter of the wall where the liquid outlet hole is located is greater than the outer diameter of the wall where the oil hole is located. The annular gap between the wall where the liquid outlet hole is located and the wall where the oil hole is located is used to connect the liquid outlet hole and the plurality of oil holes.

10. The power assembly according to any one of claims 1 to 9, characterized in that: The outer diameter of the annular member is smaller than the outer diameter of the threaded section, and the through hole includes two openings, which are located at the axial ends of the through hole, wherein the inner diameter of one opening is equal to the inner diameter of the internal thread, larger than the inner diameter of the other opening, and larger than the outer diameter of the portion of the annular member inserted into the axial hole of the transmission shaft.

11. The powertrain according to claim 10, characterized in that: The inner diameter of the other opening is larger than the outer diameter of the portion of the annular member received in the transmission shaft.

12. The powertrain according to claim 11, characterized in that: The inner diameter of the other opening is smaller than the inner diameter of the shaft hole of the transmission shaft.

13. The power assembly according to any one of claims 10 to 12, characterized in that: The integrated oil plug includes a leakage section, which is used to be located at the axial ends of the threaded section together with the annular member, the outer diameter of the leakage section is larger than the inner diameter of the one opening, and the leakage section is used to be located at the axial sides of the housing together with the transmission shaft.

14. The power assembly according to any one of claims 1 to 13, characterized in that: The transmission shaft includes a reducer input shaft, the annular 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 used to be inserted into the other end of the reducer input shaft.

15. An electric vehicle, characterized in that: It comprises a plurality of wheels and a powertrain as claimed in any one of claims 1 to 14, wherein the powertrain is used to drive one or more of the wheels.

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