Power assembly and electric vehicle

Abstract

The utility model discloses a power assembly and an electric vehicle, and relates to the technical field of power assemblies, the power assembly comprises a through hole and an integrated plug, the integrated plug comprises a threaded section, an annular piece and a plurality of connecting pieces, one side face, facing the threaded section, of the annular piece is used for being fixedly connected with the threaded section through the connecting pieces, and the through hole is formed in the through hole. The gap between one annular piece and one threaded section is used for communicating the center hole of one annular piece with one liquid outlet hole in the inner wall of one through hole, the center hole of one annular piece is used for communicating with one liquid guide pipe, and the other end of one liquid guide pipe is used for stretching into a shaft hole of one transmission shaft in the power assembly. According to the power assembly, the structural plugging piece used for guiding cooling liquid and the oil guiding piece are integrated into the integrated plug, the machining cost of the power assembly can be reduced, the assembling efficiency can be improved, and parts can be maintained and replaced more easily.

Description

TECHNICAL FIELD

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

[0002] The power assembly is a core component of a new energy vehicle, and is developing towards higher integration, for example, a two-in-one power assembly system of an electric motor and a reducer. When the power assembly is working, the electric motor and the reducer both have a heating phenomenon, and a cooling channel and an oil guide are usually arranged in the power assembly, and the cooling liquid circulates through the cooling channel and the oil guide to timely take away the heat generated by the high-temperature components. At present, a hole position is usually reserved on the power assembly shell to facilitate assembly and maintenance, and after the assembly of the oil guide and other structures is completed, the reserved hole position needs to be assembled with a sealing element for sealing. In the product production process, there are problems such as too many parts, complex structure and difficult assembly. CONTENT OF THE UTILITY MODEL

[0003] The present application provides a power assembly and an electric vehicle.

[0004] In a first aspect, the present application provides a power assembly, comprising a through hole and an integrated plug, the through hole being in communication between the inside and outside of a housing, the integrated plug being used to pass through the through hole, and the integrated plug comprising a threaded segment, a ring-shaped member and a plurality of connecting members.

[0005] The threaded segment is used to extend into the through hole and engage the internal thread of the through hole, the ring-shaped member on one side of the threaded segment is used to fixedly connect the threaded segment through the plurality of connecting members, and the other side of the ring-shaped member away from the threaded segment is used to fix one end of a liquid guide pipe.

[0006] The hole wall of the through hole comprises a liquid outlet hole, the plurality of connecting members are used to separate the ring-shaped member and the threaded segment, the gap between the ring-shaped member and the threaded segment is used to communicate the central hole of the ring-shaped member and the liquid outlet hole, the central hole of the ring-shaped member is used to communicate the liquid guide pipe, and the other end of the liquid guide pipe is used to extend into the shaft hole of a transmission shaft in the power assembly.

[0007] In the embodiment of the present application, the integrated plug is connected by the plurality of connecting pieces between the threaded segment and the ring-shaped piece into an integrated structure, and only needs to be screwed into the through hole during assembly, so that the through hole is sealed and the oil passage between the internal flow passage and the transmission shaft is connected, without the need to assemble a plurality of components, which is beneficial to reduce the machining cost of the power assembly and improve the assembly efficiency, and is more beneficial to maintenance and replacement of components. The gap between the threaded segment and the ring-shaped piece forms part of the oil passage in the integrated plug, and the central hole of the ring-shaped piece forms part of the oil passage of the integrated plug, so that the integrated plug can satisfy the dual functions of sealing the through hole and conveying oil from the internal flow passage to the transmission shaft.

[0008] In an embodiment, the plurality of connecting pieces are arranged around an axis of the ring-shaped piece, one end of each connecting piece faces the axis of the ring-shaped piece, the other end of each connecting piece is away from the axis of the ring-shaped piece, and the interval of the one end of the two adjacent connecting pieces in the circumferential direction of the ring-shaped piece is smaller than the interval of the other end.

[0009] In the embodiment of the present application, the gap between the ring-shaped piece and the threaded segment forms an annular opening on the outer circumferential surface of the integrated plug, or forms a plurality of arc-shaped openings. When the integrated plug is screwed into the through hole, even if there is a deviation in the screwing angle, the gap between the ring-shaped piece and the threaded segment can be connected with the liquid outlet hole on the hole wall of the through hole, ensuring that the cooling liquid in the internal flow passage can enter the shaft hole of the transmission shaft through the oil passage in the integrated plug. The fan-shaped channels formed between the two adjacent connecting pieces have a sufficient length in the circumferential direction of the ring-shaped piece, and when the integrated plug is screwed into the through hole and screwed to different angles, the gap between the ring-shaped piece and the threaded segment can be connected with the liquid outlet hole on the hole wall of the through hole, ensuring that the cooling liquid in the internal flow passage can enter the shaft hole of the transmission shaft through the oil passage in the integrated plug.

[0010] In an embodiment, the length of each connecting piece in the radial direction of the ring-shaped piece is smaller than the radius of the ring-shaped piece.

[0011] In the embodiment of the present application, by limiting the length of each connecting piece in the radial direction of the ring-shaped piece to be smaller than the radius of the ring-shaped piece, the other end of each connecting piece can extend to be coplanar with or have a certain interval distance from the outer circumferential surface of the ring-shaped piece. When the integrated plug is screwed into the through hole, even if there is a deviation in the screwing angle, the connecting piece does not completely block the liquid outlet hole when the connecting piece is completely or partially opposite to the liquid outlet hole on the hole wall of the through hole, and the space on both sides of the connecting piece can be connected with the liquid outlet hole, ensuring that the cooling liquid in the internal flow passage can enter the transmission shaft through the oil passage in the integrated plug.

[0012] In one embodiment, the width of each connecting piece along the circumferential direction of the ring-shaped piece is less than the hole diameter of the liquid outlet hole along the circumferential direction of the through hole.

[0013] In the embodiments of the present application, by limiting the width of each connecting piece along the circumferential direction of the ring-shaped piece to be less than the hole diameter of the liquid outlet hole along the axial direction of the through hole, even if there is a deviation in the screwing angle, when the integrated plug is screwed into the through hole, the connecting piece will not completely block the liquid outlet hole when the connecting piece and the liquid outlet hole on the hole wall of the through hole are completely or partially opposite, the space on both sides of the connecting piece can be connected with the liquid outlet hole, and the cooling liquid in the liquid outlet hole can enter the gap on both sides of the connecting piece.

[0014] In one embodiment, the gap between the ring-shaped piece and the threaded segment along the axial direction of the ring-shaped piece is greater than the hole diameter of the liquid outlet hole along the axial direction of the ring-shaped piece.

[0015] In the embodiments of the present application, by limiting the gap distance between the ring-shaped piece and the threaded segment along the axial direction of the ring-shaped piece to be greater than the hole diameter of the liquid outlet hole along the axial direction of the ring-shaped piece, even if there is a deviation in the screwing depth, whether the screwing depth is too shallow or too deep, the gap between the ring-shaped piece and the threaded segment can be connected with the liquid outlet hole on the hole wall of the through hole, so as to prevent the gap between the ring-shaped piece and the threaded segment from being completely blocked by the ring-shaped piece when the ring-shaped piece is completely located on the side of the liquid outlet hole close to the threaded segment along the axial direction of the ring-shaped piece, and prevent the gap between the ring-shaped piece and the threaded segment from being completely blocked by the threaded segment when the edge of the threaded segment close to the ring-shaped piece is completely located on the side of the liquid outlet hole away from the threaded segment along the axial direction of the ring-shaped piece, so as to ensure that the cooling liquid in the internal flow channel can enter the transmission shaft through the oil channel in the integrated plug.

[0016] By limiting the gap distance between the ring-shaped piece and the threaded segment along the axial direction of the ring-shaped piece to be greater than the hole diameter of the liquid outlet hole along the axial direction of the ring-shaped piece, when designing the integrated plug, the length of the threaded segment along the X direction can be designed to be slightly smaller than the length of the internal thread in the through hole along the X direction, the gap along the axial direction of the ring-shaped piece is greater than the hole diameter of the liquid outlet hole along the axial direction of the ring-shaped piece, so that the gap along the axial direction of the ring-shaped piece maintains a certain width allowance, and when the threaded segment is screwed to the deepest position in the through hole, the threaded segment will not have a relative relationship with the liquid outlet hole along the radial direction of the ring-shaped piece, and the threaded segment will not block and affect the oil supply of the liquid outlet hole into the gap. When the threaded segment is screwed to the through hole close to the deepest position, the ring-shaped piece will not have a relative relationship with the liquid outlet hole along the radial direction of the ring-shaped piece, and the ring-shaped piece will not block and affect the oil supply of the liquid outlet hole into the gap.

[0017] In an embodiment, the outer diameter of the liquid guide is smaller than the outer diameter of the ring member, the inner diameter of the liquid guide is greater than or equal to the inner diameter of the central hole of the ring member, and the length of the liquid guide along the axial direction of the ring member is greater than the gap between the ring member and the threaded segment.

[0018] In the embodiments of the present application, by limiting the size relationship between the outer diameters of the liquid guide and the ring member, the length of the liquid guide along the axial direction of the ring member, and the size relationship between the inner diameter of the liquid guide and the inner diameter of the central hole of the ring member, it is ensured that the liquid guide in the integrated plug can be inserted into the shaft hole of the input shaft of the speed reducer to inject cooling liquid into the shaft hole, so that the cooling liquid entering the liquid guide from the central hole of the ring member is not hindered, and the cooling liquid injected from the liquid outlet hole on the hole wall of the through hole can smoothly pass through the central hole of the ring member and enter the liquid guide, ensuring the speed of the cooling liquid flowing into the input shaft of the speed reducer. The ring member cannot be inserted into the shaft hole of the input shaft of the speed reducer, and the position of the screwed connection between the integrated plug and the through hole in the axial direction of the ring member is limited, which further ensures that different integrated plugs can be inserted into the through hole to the same or similar depth when they are matched with different housings, and the gap between the ring member and the threaded segment and the liquid outlet hole in the through hole can be connected in the axial direction of the ring member.

[0019] In an embodiment, the outer diameter of the ring member and the outer diameter of the threaded segment are greater than the inner diameter of the shaft hole, and the outer diameter of the ring member is smaller than the outer diameter of the threaded segment.

[0020] In the embodiments of the present application, the outer diameter of the ring member is greater than the inner diameter of the shaft hole, the outer diameter of the threaded segment is also greater than the inner diameter of the shaft hole, the outer diameter of the ring member is smaller than the outer diameter of the threaded segment, and when the liquid guide is inserted into the speed reducer shaft cavity of the input shaft, the outer diameter of the ring member is greater than the inner diameter of the speed reducer shaft cavity. The ring member forms a barrier structure, and the gap between the ring member and the end face of the input shaft forms a first oil blocking structure to prevent oil leakage. In addition, the outer diameter of the ring member is smaller than the outer diameter of the threaded segment, and the threaded segment forms another barrier structure, and the second oil blocking structure is formed between the ring member and the threaded segment to prevent the cooling liquid from leaking out of the threaded segment.

[0021] When the integrated plug is assembled, the ring member cannot extend into the speed reducer shaft cavity, and the end of the input shaft can limit the maximum depth of the ring member inserted into the through hole in the axial direction thereof, so as to prevent the integrated plug from being inserted into the through hole to a large depth, causing the gap between the ring member and the threaded segment and the liquid outlet hole on the hole wall of the through hole to be misaligned in the axial direction of the ring member. It is ensured that the gap between the ring member and the threaded segment and the liquid outlet hole can be kept in a connected state in the axial direction of the ring member after the integrated plug is installed in place in the through hole.

[0022] The outer diameter of the ring-shaped part is smaller than the outer diameter of the threaded segment, the inner thread on the inner wall of the threaded segment and the through hole is engaged, the distance between the liquid outlet hole and the center line of the through hole can be equal to the inner diameter of the inner thread, the distance between the liquid outlet hole and the center line of the through hole can be equal to the outer diameter of the threaded segment, and the distance between the liquid outlet hole and the center line of the through hole is greater than the outer diameter of the ring-shaped part, so that the integrated plug is screwed into the through hole, even if there is an error in the screwing angle, there is always a gap between the ring-shaped part and the threaded segment and the liquid outlet hole, to ensure that the cooling liquid in the liquid outlet hole can flow into the gap between the ring-shaped part and the threaded segment.

[0023] In an embodiment, a through hole penetrates the housing along the axial direction of a ring-shaped part, the through hole comprises a housing inner opening and a housing outer opening, the inner diameter of the housing inner opening is smaller than the inner diameter of the housing outer opening, smaller than the outer diameter of the threaded segment and greater than or equal to the outer diameter of the ring-shaped part.

[0024] In the embodiment of the present application, the design of the inner narrow and outer wide facilitates the insertion of the integrated plug. The outer diameter of the ring-shaped part is smaller than the outer diameter of the threaded segment, and the ring-shaped part with a smaller inner diameter and a smaller outer diameter can be better matched. The inner diameter of the housing inner opening is the same as the inner diameter of the second wall surface, the housing inner opening can be an opening on the side of the second wall surface away from the threaded segment, and the housing outer opening can be an opening on the outer side of the end cover. The housing inner opening with a smaller inner diameter can be better matched with the ring-shaped part with a smaller outer diameter, and the housing outer opening with a larger inner diameter can be better matched with the threaded segment with a larger outer diameter. For the power assembly structure that needs to be sealed, the design of the inner narrow and outer wide can better match the sealing gasket or sealing glue and other sealing materials, form an effective sealing structure, and help prevent the cooling liquid from leaking from the through hole, thereby improving the overall sealing performance of the power assembly.

[0025] In the embodiment of the present application, the inner diameter of the housing inner opening is smaller than the outer diameter of the threaded segment, which can limit the integrated plug and limit the maximum depth of the integrated plug screwed into the through hole, without affecting the cooperation of other parts in the power assembly.

[0026] In the embodiment of the present application, the inner diameter of the housing inner opening is greater than or equal to the outer diameter of the ring-shaped part, which enables the ring-shaped part to be attached to the second wall surface or to form another annular gap between the ring-shaped part and the second wall surface. The ring-shaped part can be screwed into the through hole along with the threaded segment, and the wall surface of the through hole will not generate large friction with the ring-shaped part.

[0027] In an embodiment, along the axial direction of a ring-shaped part, the distance between a liquid outlet hole and a housing outer opening is greater than the length of a threaded segment, and the distance between a liquid outlet hole and a housing inner opening is greater than the thickness of a ring-shaped part.

[0028] In the embodiments of the present application, the distance between the liquid outlet hole and the inner side opening of the shell is greater than the thickness of the annular member along the axial direction of the annular member. The distance between the liquid outlet hole and the inner side opening of the shell refers to the distance from the point closest to the inner side opening of the shell to the inner side opening of the shell. The thickness of the annular member refers to the maximum length along the axial direction of the annular member. In combination with the above-mentioned inner diameter of the inner side opening of the shell being greater than or equal to the outer diameter of the annular member, when the annular member is screwed into the through hole along the threaded segment, at the deepest position or near the deepest position, the annular member will not be opposite to the liquid outlet hole along its radial direction, which ensures that the annular member will not affect the flow speed of the cooling liquid from the liquid outlet hole to the gap, and ensures the reasonable assembly of the integrated plug and the through hole. Since the annular member does not cover the liquid outlet hole, it can ensure the smooth flow of the cooling liquid, which is conducive to the flow of the cooling liquid and prevents the assembly error from affecting the flow of the internal flow channel.

[0029] In an embodiment, the integrated plug further comprises an exposed segment, the exposed segment is used to fixedly connect one end of a threaded segment, the other end of the threaded segment is used to extend into a through hole, the other end of the threaded segment is used to fixedly connect an annular member through a plurality of connecting members, the end surface of the annular member is used to fixedly connect the other end of the threaded segment, the outer diameter of the exposed segment is greater than the outer diameter of the threaded segment, and the inner diameter of the sealing ring is greater than the outer diameter of the threaded segment and less than the outer diameter of the exposed segment.

[0030] In the embodiments of the present application, the cooperation between the sealing ring and the annular groove can form a tight sealing interface, effectively preventing the leakage of cooling liquid. Secondly, the annular groove fixes and positions the sealing ring, avoiding the sliding or rotation of the sealing ring during installation and use. This fixing effect not only ensures the accurate butt joint between the sealing ring and the sealing groove, but also improves the stability and reliability of the sealing ring. At the same time, the annular groove can effectively prevent the sealing ring from falling off or being damaged when subjected to external force, thereby prolonging the service life of the sealing ring. The cooperation design of the sealing ring and the groove also makes the installation and disassembly process more convenient. During installation, the sealing ring can be fixed at the desired position by using the integrated plug. This installation method not only saves time and effort, but also reduces the installation difficulty and cost. When disassembling, the sealing ring can be easily taken out of the annular groove by unscrewing the integrated plug, which is convenient for maintenance and replacement. In addition, since the sealing ring is easy to replace and the installation is simple, this cooperation method can also reduce the maintenance cost and time of the equipment.

[0031] In an embodiment, the inner side opening of the shell comprises an annular protrusion, the protruding direction of the annular protrusion is towards the center line of the through hole, and the inner diameter of the annular protrusion is less than or equal to the outer diameter of the annular member.

[0032] In the embodiments of the present application, the annular protrusion is a second wall surface on one side of the center line of the through hole, the second wall surface and the annular member have another annular space therebetween, the inner diameter of the annular protrusion is greater than or equal to the outer diameter of the annular member, so that the second wall surface can cooperate with the annular member to form another annular space, the other annular space is smaller than the spacing between the annular member and the inner thread along the radial direction of the annular member, preventing a large gap between the annular member and the inner wall of the through hole, and preventing the cooling liquid discharged from the liquid outlet hole from leaking from the periphery of the annular member.

[0033] In an embodiment, the power assembly includes a motor, a reducer, and a plurality of transmission shafts, the plurality of transmission shafts including a motor shaft of the motor and an input shaft of the reducer, the motor shaft of the motor being used for transmission connection with the input shaft of the reducer, a housing of the power assembly being used for accommodating at least one of the motor or the reducer, the housing including a bearing groove, the bearing groove being used for fixing a bearing of the motor shaft of the motor or the input shaft of the reducer, and a through hole penetrating through a groove bottom of the bearing groove along a center line direction of the through hole.

[0034] In an embodiment, the housing includes an internal flow channel, and the groove bottom of the bearing groove further includes another liquid outlet hole, the another liquid outlet hole and the liquid outlet hole receiving the cooling liquid through the internal flow channel.

[0035] In the embodiment, an axis of the liquid outlet hole is perpendicular to an axis of the bearing groove, an axis of the another liquid outlet hole is parallel to the axis of the bearing groove, and a hole diameter of the liquid outlet hole is greater than a hole diameter of the another liquid outlet hole.

[0036] In the embodiment, by arranging the another liquid outlet hole on the groove bottom of the bearing groove, the another liquid outlet hole and the internal flow channel are connected, the cooling liquid in the internal flow channel can partially enter the bearing groove through the another liquid outlet hole to cool the bearing, and another part of the cooling liquid can enter the integrated plug through the liquid outlet hole, enter the shaft hole of the transmission shaft through the integrated plug, and cool the transmission shaft. In addition, the hole diameter of the liquid outlet hole is greater than the hole diameter of the another liquid outlet hole, the axis of the liquid outlet hole is parallel to the flow direction of the internal flow channel, and most of the cooling liquid in the internal flow channel can flow into the shaft hole of the transmission shaft through the liquid outlet hole, so that the volume of the cooling liquid in the transmission shaft and the bearing groove can be effectively controlled, and the amount of the cooling liquid can be reasonably distributed.

[0037] In an embodiment, the power assembly further includes another liquid guide pipe, a shaft hole of one of the motor shaft of the motor or the input shaft of the reducer is used for accommodating the another liquid guide pipe, one end of the another liquid guide pipe is used for extending into the liquid guide pipe, and the other end of the another liquid guide pipe is used for extending into a shaft hole of the other of the motor shaft of the motor or the input shaft of the reducer, and an inner diameter of the liquid guide pipe is greater than an inner diameter of the central hole of the annular member.

[0038] In the embodiment of the present application, the inner diameter of the liquid guide is greater than the inner diameter of the central hole of the annular part, so as to ensure that the cooling liquid discharged by the annular part can flow into another liquid guide through the liquid guide, and there is no flow section area reducing flow section in the flow process, and a good and uniform flow velocity is maintained into another liquid guide, which is beneficial to adjusting the flow velocity of the cooling liquid to meet the cooling of the motor shaft or the input shaft.

[0039] In a second aspect, the present application provides an electric vehicle, comprising a plurality of wheels and a power assembly as in the first aspect, the power assembly being configured to drive one or more wheels.

[0040] In the embodiment of the present application, the threaded section and the annular part in the power assembly are connected by a plurality of connecting pieces to form an integrated plug, which is assembled by screwing into the through hole, thereby realizing the sealing of the through hole and the connection between the internal flow channel and the oil passage of the transmission shaft, without the need to assemble a plurality of components, which is beneficial to reducing the processing cost of the electric vehicle and improving the assembly efficiency, and is more conducive to the maintenance and component replacement of the electric vehicle. The gap between the threaded section and the annular part forms part of the oil passage in the integrated plug, and the central hole of the annular part forms part of the oil passage of the integrated plug, so that the integrated plug can meet the dual functions of sealing the through hole and supplying oil from the internal flow channel to the transmission shaft. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 A schematic diagram of an electric vehicle provided in the embodiment of the present application;

[0042] Figure 2 A schematic diagram of a power assembly provided in the embodiment of the present application;

[0043] Figure 3 Another schematic diagram of a power assembly provided in the embodiment of the present application;

[0044] Figure 4 An axial view of a power assembly provided in the embodiment of the present application;

[0045] Figure 5 A sectional view of a power assembly provided in the embodiment of the present application;

[0046] Figure 6 An assembly schematic diagram of an integrated plug and a through hole provided in the embodiment of the present application;

[0047] Figure 7 An exploded schematic diagram of a reducer end cover, a sealing ring and an integrated plug provided in the embodiment of the present application;

[0048] Figure 8 A structural schematic diagram of an integrated plug provided in the embodiment of the present application;

[0049] Figure 9 A schematic diagram of the integrated plug provided by the embodiment of the present application along a direction;

[0050] Figure 10 A schematic diagram of the B-B cross section in Figure 9

[0051] Figure 11 A schematic diagram of the C-C cross section in Figure 9

[0052] A schematic diagram of another structure of the integrated plug provided by the embodiment of the present application; Figure 12

[0053] A schematic diagram of a connecting piece and a ring provided by the embodiment of the present application; Figure 13

[0054] A schematic diagram of the D-D cross section in Figure 14 Figure 5 A schematic diagram of the II enlarged view in

[0055] Figure 15 Figure 14 A schematic diagram of the III enlarged view in

[0056] Figure 16 A schematic diagram of the cooperation of a liquid outlet hole and the integrated plug provided by the embodiment of the present application;

[0057] Figure 17 A schematic diagram of a power assembly part cross section provided by the embodiment of the present application;

[0058] Figure 18 A schematic diagram of the inner side of a end cover provided by the embodiment of the present application;

[0059] Figure 19 An exploded schematic diagram of a through hole, a sealing ring and the integrated plug provided by the embodiment of the present application;

[0060] Figure 20 A schematic diagram of an end face contact sealing ring provided by the embodiment of the present application;

[0061] Figure 21 A schematic diagram of an angle contact sealing ring provided by the embodiment of the present application. DETAILED DESCRIPTION

[0062] The embodiments of the present application will be described below in conjunction with the drawings of the embodiments of the present application.

[0063] ​​​When the electric vehicle is running, the power assembly 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 power assembly. Therefore, in order to ensure the continuous and efficient and safe operation of the power assembly, a cooling liquid circulation system is often introduced into the power assembly. The system effectively absorbs and removes the excess heat generated inside by using the flowability and heat conductivity of the cooling liquid, thereby maintaining the power assembly within a suitable working temperature range. However, designing too many components inside the power assembly 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, and increase 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.

[0064] The embodiment of the present application provides a power assembly with an oil guide plug. The housing of the power assembly comprises a through hole and an integrated plug. The through hole communicates the inside and outside of the housing. The integrated plug is used to pass through the through hole. The integrated plug comprises a threaded segment, a ring-shaped piece and a plurality of connecting pieces. The threaded segment is used to extend into the through hole and engage the internal thread of the through hole. The ring-shaped piece is used to be fixedly connected to the threaded segment through the plurality of connecting pieces. The ring-shaped piece is used to fix one end of a liquid guide pipe. The hole wall of the through hole comprises a liquid outlet hole. The plurality of connecting pieces are used to separate the ring-shaped piece and the threaded segment. The gap between the ring-shaped piece and the threaded segment is used to communicate the central hole of the ring-shaped piece and the liquid outlet hole. The central hole of the ring-shaped piece is used to communicate the liquid guide pipe. The other end of the liquid guide pipe is used to extend into the shaft hole of a transmission shaft in the power assembly. The power assembly provided by the embodiment of the present application integrates the structure blocking piece and the oil guide piece for guiding the cooling liquid into the integrated plug, which is beneficial to reduce the processing cost of the power assembly and improve the assembly efficiency, and is more beneficial to the maintenance and replacement of components.

[0065] The embodiment of the present application provides a power assembly. The power assembly is applied to an electric vehicle, and improves the overall performance of the electric vehicle.

[0066] Please refer to Figure 1 , Figure 1A schematic diagram of an electric vehicle is provided in the embodiments of the present application. In the embodiments of the present application, the electric vehicle 1 comprises a power assembly 10, a vehicle frame 20, a power battery 30 and wheels 40. The vehicle frame 20 is used to fix and mount the power assembly 10, the power battery 30 and the wheels 40. The power assembly 10 is used to receive power supply from the power battery 30 and to drive the wheels 40 to rotate so as to make the electric vehicle 1 move forward.

[0067] 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).

[0068] Please refer to Figure 2 , Figure 2 A schematic diagram of a power assembly is provided in the embodiments of the present application. In the embodiments of the present application, the power assembly 10 comprises a motor 100, a reducer 200 and a motor controller 300. The motor controller 300 is used to receive direct current from the power battery 30 and to output alternating current to the motor 100. The motor 100 is used to receive the alternating current outputted by the motor controller 300 and to generate mechanical energy, and then the mechanical energy is transmitted to the wheels 40 through the reducer 200 so as to drive the wheels 40 to make the electric vehicle 1 move.

[0069] In an embodiment, the power assembly 10 comprises the motor 100 and the reducer 200. In an embodiment, the reducer 200 in the power assembly 10 is also referred to as a transmission 200.

[0070] Please refer to Figure 3 , Figure 3 Another schematic diagram of a power assembly is provided in the embodiments of the present application. In the embodiments of the present application, the motor 100 comprises a motor shaft 110, a motor rotor and a motor stator. The motor stator is used to receive the alternating current outputted by the motor controller 300 to generate a magnetic field to drive the motor rotor to rotate the motor shaft 110.

[0071] In the embodiment of the present application, the speed reducer 200 comprises an input shaft 210, an intermediate shaft 220 and an output shaft 230. In the speed reducer 200, the input shaft 210 is used to drivingly connect the input shaft 210 and the motor shaft 110 of the motor 100, the intermediate shaft 220 is used to drivingly connect the input shaft 210 and the output shaft 230, and the output shaft 230 is used to drivingly connect the wheels 40 of the electric vehicle 1. The motor shaft 110 of the motor 100, the input shaft 210, the intermediate shaft 220 and the output shaft 230 of the speed reducer 200 are referred to as transmission shafts (110, 210, 220, 230) of the power assembly 10, and at least one transmission shaft in the power assembly 10 comprises a shaft hole for transmitting the cooling liquid.

[0072] In an embodiment, the motor shaft 110 comprises a shaft hole 111, and the input shaft 210 comprises a shaft hole 211. The input shaft 210 and the motor shaft 110 are insertedly fitted, and the shaft hole 111 of the motor shaft 110 and the shaft hole 211 of the input shaft 210 are in communication.

[0073] In an embodiment, the transmission shaft (110, 210, 220, 230) is at least one of the motor shaft 110, the input shaft 210, the intermediate shaft 220 and the output shaft 230. In an embodiment, the transmission shaft in the power assembly 10 is taken as the input shaft 210, the shaft hole 211 of the input shaft 210 accommodates a flow guide pipe 212, the motor shaft 110 of the motor 100 extends into the shaft hole 211 of the input shaft 210 of the speed reducer 200, and the flow guide pipe 212 accommodated in the shaft hole 211 of the input shaft 210 of the speed reducer 200 transmits the cooling liquid to the shaft hole 111 of the motor shaft 110.

[0074] Figure 4 A front view of the power assembly provided in the embodiment of the present application along the axial direction, Figure 5 A sectional view of the power assembly provided in the embodiment of the present application. Figure 5 The sectional plane shown in FIG. 4 is formed along the A-A sectional line in FIG. 3, please refer to FIG. 3. Figure 4 The sectional plane shown in FIG. 4 is formed along the A-A sectional line in FIG. 3, please refer to FIG. 3. Figure 5 The power assembly 10 further comprises a housing 400. The housing 400 is used to accommodate at least one of the motor 100 or the speed reducer 200.

[0075] Please refer to FIG. 4. Figure 5 The housing 400 comprises a through hole 411 penetrating through the housing 400, and one through hole 411 is used to communicate the inside and outside of the housing 400.

[0076] In an embodiment, the housing 400 comprises a speed reducer end cover 410, the speed reducer end cover 410 comprises a through hole 411 penetrating through the speed reducer end cover 410 along the X direction shown in the drawing, the through hole 411 communicates the inside and outside of the speed reducer end cover 410, and an opening is respectively formed on the inner surface and the outer surface of the speed reducer end cover 410.

[0077] In an embodiment, the through hole 411 can be a fitting hole of the housing 400, a motor mounting tool can pass through the through hole 411 from outside of the housing 400 and extend into the cavity enclosed by the housing 400, and the part of the motor mounting tool extending into the cavity enclosed by the housing 400 can be matched with the motor shaft 110 of the motor 100, so as to align and connect the motor shaft 110 of the motor 100 and the input shaft 210 of the speed reducer 200.

[0078] In an embodiment, the hole wall of the through hole 411 comprises a liquid outlet hole 4111, the liquid outlet hole 4111 is communicated with the internal flow channel 430 in the housing 400, and the liquid outlet hole 4111 can be an opening of the internal flow channel 430 formed on the hole wall of the through hole 411.

[0079] In an embodiment, the housing comprises a bearing groove for fixing a bearing of a motor shaft of a motor or an input shaft of a speed reducer, and a through hole penetrates the bottom of the bearing groove along the center line of the through hole. For example, the inner side of the housing 400 is provided with a speed reducer bearing groove 420 surrounding the periphery of the through hole 411, the speed reducer bearing groove 420 is used for accommodating the speed reducer bearing 500 which can be sleeved outside the input shaft 210 of the speed reducer 200, the through hole 411 penetrates the bottom of the speed reducer bearing groove 420 along the center line of the through hole 411, the center line of the through hole 411 and the axis of the input shaft 210 of the speed reducer 200 coincide and both extend along the X direction shown in the figure.

[0080] In an embodiment, the housing 400 of the power assembly 10 is usually provided with a plug, after the motor shaft 110 of the motor 100 and the input shaft 210 of the speed reducer 200 are installed and the motor mounting tool is withdrawn, the through hole 411 is sealed by the plug, which can prevent the cooling liquid in the housing 400 from leaking out through the through hole 411, and can also prevent impurities from entering the inside of the housing 400 through the through hole 411 to pollute the power assembly 10, and the housing 400 is provided with the 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.

[0081] In an embodiment, the housing 400 comprises an internal flow channel 430, the hole wall of the through hole 411 comprises a liquid outlet hole 4111, the cooling liquid flows out through the liquid outlet hole 4111 from the internal flow channel 430 of the speed reducer end cover, and then enters the transmission shaft (110, 320, 330, 340) through the shaft hole to lubricate the transmission shaft. Taking the motor shaft 110 as an example, the cooling liquid in the internal flow channel 430 flows out through the liquid outlet hole 4111 and enters the flow guide pipe 212 through the speed reducer input shaft shaft hole 211, so as to enter the motor shaft shaft hole 111 to cool the motor shaft.

[0082] Please refer to Figure 5 , the shell further comprises an integrated plug 450, an integrated plug 450 is used to pass through a through hole 411.

[0083] Please refer to Figure 6 and Figure 7 , Figure 6 is the assembly schematic diagram of the integrated plug and the through hole provided by the embodiment of the application, Figure 6 is the enlarged view of I in Figure 5 ; Figure 7 is the explosion schematic diagram of the reducer end cover 410, the sealing ring 440 and the integrated plug 450 provided by the embodiment of the application. The integrated plug 450 is used to connect through the through hole 411 and the internal thread 4112 of the inner wall of the through hole 411. The through hole 411 is used to accommodate and fix the integrated plug 450. The sealing ring 440 is arranged between the through hole 411 and the integrated plug 450. The through hole 411 and the integrated plug 450 are sealed and connected through the sealing ring 440.

[0084] Please refer to Figure 6 , Figure 8 , Figure 9 and Figure 10 , Figure 8 is the structural schematic diagram of the integrated plug 450 provided by the embodiment of the application, Figure 9 is the schematic diagram of the integrated plug 450 in a direction provided by the embodiment of the application, Figure 10 is the B-B cross-sectional schematic diagram in Figure 9 . The integrated plug 450 comprises a threaded segment 451, an annular piece 453 and a plurality of connecting pieces 452. Wherein: the threaded segment 451, the plurality of connecting pieces 452 and the annular piece 453 can be arranged in sequence along the X direction shown in the figure, the integrated plug 450 is installed into the through hole 411 and seals the through hole 411, the axial direction of the annular piece 453 is parallel or coincides with the axial direction of the output shaft 230 of the motor 100 in the power assembly 10.

[0085] The threaded segment 451 is used to extend into the through hole 411. The inner wall of the through hole 411 is provided with an internal thread 4112. The outer wall of the threaded segment 451 is provided with an external thread 4511. The threaded segment 451 is used to engage the internal thread 4112 of the through hole 411. The external thread 4511 of the threaded segment 451 and the internal thread 4112 of the through hole 411 are engaged and connected. By screwing the integrated plug 450 into the through hole 411, the external thread 4511 of the threaded segment 451 and the internal thread 4112 of the through hole 411 are engaged and connected to realize the fixed connection between the integrated plug 450 and the inner wall of the through hole 411.

[0086] The annular member 453 is connected to the threaded segment 451 by a plurality of connecting members 452, which are used to separate the annular member 453 and the threaded segment 451, and are connected between the annular member 453 and the threaded segment 451 to form the integrated plug 450. When the threaded segment 451 is screwed to connect with the internal thread of the through hole 411, the connecting members 452 and the annular member 453 can rotate with the threaded segment 451 and enter into the through hole 411. In one embodiment, the annular member 453, the connecting members 452 and the threaded segment 451 can be made of the same material, such as metal material, and can be connected as an integrated structure by welding or can be integrally injection molded.

[0087] The threaded segment 451 can be in a cylindrical shape, and an external thread 4511 can be arranged on the outer circumferential surface of the cylinder. The threaded segment 451 in the cylindrical shape can be in a solid structure or a hollow structure in the form of a sleeve.

[0088] The gap 454 between the annular member 453 and the threaded segment 451 is used to communicate the central hole 4531 of the annular member 453 and the liquid outlet hole 4111. The gap 454 between the annular member 453 and the threaded segment 451 is in communication with the central hole 4531 of the annular member 453 on the side of the annular member 453 along the radial direction towards the center line of the annular member 453. When the annular member 453 is screwed into the through hole 411 following the threaded segment 451, the gap 454 between the annular member 453 and the threaded segment 451 is in communication with the liquid outlet hole 4111 on the side of the annular member 453 along the radial direction away from the center line of the annular member 453.

[0089] The central hole 4531 of the annular member 453 is used to communicate a liquid guide pipe 455, which is connected to the central hole 4531 of the annular member 453 on one end along the X direction, or is connected to the side of the annular member 453 away from the threaded segment 451 on one end along the X direction. Figure 6 The internal passage 4551 of the liquid guide pipe 455 is in communication with the central hole 4531 of the annular member 453. Figure 6 The internal passage 4551 of the liquid guide pipe 455 is in communication with the central hole 4531 of the annular member 453. Figure 6 The other end of the liquid guide pipe 455 along the opposite direction of the X direction is used to extend into the shaft hole of the transmission shaft in the power assembly 10, such as the shaft hole 211 of the input shaft 210.

[0090] The cooling liquid in the internal flow channel 430 is used to flow along the liquid outlet hole 4111, the gap 454 between the annular member 453 and the threaded segment 451, the central hole 4531 of the annular member 453 and the internal passage 4551 of the liquid guide pipe 455 in sequence, and then flows into the shaft hole of the transmission shaft from the other end of the liquid guide pipe 455, such as the shaft hole 211 of the input shaft 210.

[0091] Please refer toFigure 8 The integrated plug 450 has a combined structure of multiple cylindrical segments along the axial direction, and the circumferential side wall is the circumferential surface of the multiple cylindrical segments. In one embodiment, the integrated plug 450 has a threaded segment 451 and a ring member 453, which are connected by multiple connecting members 452 to form an integrated structure.

[0092] The threaded segment 451 can engage with the internal thread 4112 on the hole wall of the through hole 411, and can be fixed in the through hole 411 and connected with the inner wall of the through hole 411 to seal the through hole 411. The ring member 453 has a central hole 4531 extending along the axial direction of the ring member 453 to form a passage extending in the X direction shown in the figure. The gap 454 between the ring member 453 and the threaded segment 451 is open on the circumferential side wall of the integrated plug 450 along the radial outer side of the ring member 453, and the opening on the circumferential side wall can be connected with the liquid outlet hole 4111 on the inner wall of the through hole 411. The gap 454 between the ring member 453 and the threaded segment 451 is connected with the central hole 4531 of the ring member 453 at one end along the radial inner side of the ring member 453. The cooling liquid transported by the internal flow channel 430 can enter the gap 454 between the ring member 453 and the threaded segment 451 through the liquid outlet hole 4111, and then enter the central hole 4531 of the ring member 453, and then enter the internal passage 4551 of the liquid guide pipe 455 through the central hole 4531 of the ring member 453, and then enter the shaft hole of the transmission shaft in the power assembly 10, such as the shaft hole of the input shaft 210 of the reducer 200, to cool the rotating shaft of the reducer 200.

[0093] In the embodiments of the present application, the integrated plug 450 is connected by multiple connecting members 452 to form an integrated structure between the threaded segment 451 and the ring member 453. When assembling, only the integrated plug 450 needs to be screwed into the through hole 411 to seal the through hole 411 and connect the oil path between the internal flow channel 430 and the transmission shaft, 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 gap between the threaded segment 451 and the ring member 453 forms part of the oil path in the integrated plug 450, and the central hole 4531 of the ring member 453 forms part of the oil path of the integrated plug 450, so that the integrated plug 450 can meet the dual functions of sealing the through hole 411 and transporting oil from the internal flow channel to the transmission shaft.

[0094] Please refer to Figure 6 , Figure 8 , Figure 9 , Figure 10 andFigure 11 , Figure 11 For Figure 9 is a C-C cross-sectional view.

[0095] In the embodiments of the present application, the plurality of connecting pieces 452 are used to connect the threaded segment 451 and the annular piece 453, and the gap 454 between the threaded segment 451 and the annular piece 453, which communicates with the liquid outlet hole 4111 and the central hole 4531. The cooling oil transported by the internal flow channel 430 can enter the internal passage 4551 of the liquid guide pipe 455 in sequence through the liquid outlet hole 4111, the gap 454 and the central hole 4531, and then enter the shaft hole 211 through the internal passage 4551 of the liquid guide pipe 455 to cool the input shaft 210.

[0096] In an embodiment, the threaded segment 451 is in a cylindrical shape, engages with the through hole 411 which is also a cylindrical hole through the internal thread 4112, and seals the through hole 411. The plurality of connecting pieces 452 can make the connection between the threaded segment 451 and the annular piece 453 more stable.

[0097] In an embodiment, the plurality of connecting pieces 452 are arranged around the axis of the annular piece 453, and the plurality of connecting pieces 452 are arranged around and spaced apart from the axis of the annular piece 453. The plurality of connecting pieces 452 divide the gap 454 between the annular piece 453 and the threaded segment 451 into a plurality of parts. Figure 8 and Figure 11 For example, the four connecting pieces 452 divide the gap 454 between the annular piece 453 and the threaded segment 451 into four fan-shaped parts.

[0098] Referring to Figure 11 , one end of each connecting piece 452 faces the axis of the annular piece 453, and the other end of each connecting piece 452 is away from the axis of the annular piece 453. Each connecting piece 452 extends along the radial direction of the annular piece 453. It should be noted that the connecting piece 452 is in a strip shape, and the connecting piece 452 has two ends, i.e. an inner end and an outer end along the radial direction of the annular piece 453. Even if the connecting piece 452 is offset from the radial direction of the annular piece 453 by a certain angle, or the connecting piece 452 is not straight, it still belongs to the extension along the radial direction of the annular piece 453. In an embodiment, the connecting piece 452 can be straight, arc-shaped, broken line-shaped or other irregular shapes, as long as the connecting piece 452 can fixedly connect the annular piece 453 and the threaded segment 451, and there is a gap between adjacent connecting pieces 452 to ensure that the cooling liquid output by the liquid outlet hole 4111 can pass through the gap 454 between the annular piece 453 and the threaded segment 451 and enter the central hole 4531 of the annular piece 453.

[0099] Referring to Figure 8and Figure 11 As shown in FIG. 6, the interval 4521 of one end of two adjacent connecting pieces 452 along the circumference of the annular piece 453 is less than the interval 4522 of the other end. Specifically, the interval 4521 of one end of two adjacent connecting pieces 452 along the circumference of the annular piece 453 is the interval of the end along the radial outside of the annular piece 453, the interval 4522 of the other end of two adjacent connecting pieces 452 is the interval of the end along the radial inside of the annular piece 453, the interval 4521 of one end is less than the interval 4522 of the other end, and a channel similar to a sector is formed between the two adjacent connecting pieces 452, and a complete annular opening is formed on the outer circumferential surface of the integrated plug 450.

[0100] Figure 12 Another structure of the integrated plug 450 provided by the embodiments of the present application is shown in FIG. 7, and FIG. 8 is a sectional view of the integrated plug 450 along the line A-A in FIG. 7. Figure 12 As shown in FIG. 8, in one embodiment, when the radial outside end of the connecting piece 452 is located radially inside the outer circumferential surface of the annular piece 453, i.e., the radial outside end of the connecting piece 452 is located in the gap 454 between the annular piece 453 and the threaded segment 451, the connecting piece 452 does not protrude radially outside the gap 454 between the annular piece 453 and the threaded segment 451 along the annular piece 453, and the outer end surface of the connecting piece 452 is not coplanar with the outer circumferential surface of the annular piece 453 along the axial direction of the annular piece 453, the gap 454 between the annular piece 453 and the threaded segment 451 forms a complete annular opening on the outer circumferential surface of the integrated plug 450.

[0101] In one embodiment, as shown in FIG. 9, when the radial outside end of the connecting piece 452 extends radially along the annular piece 453 to be coplanar with the outer circumferential surface of the annular piece 453, the annular opening on the outer circumferential surface of the integrated plug 450 is divided into a plurality of arc-shaped openings by the connecting piece 452, and two adjacent annular openings are separated by the connecting piece 452. Figure 8

[0102] ​The integrated plug 450 and the shell 400 have size machining errors, and different integrated plugs 450 match different shells 400. When the integrated plug 450 is screwed into the through hole 411, the integrated plug 450 is screwed at different angles to be completely matched. The gap 454 between the annular part 453 and the threaded segment 451 forms an annular opening or a plurality of arc-shaped openings on the outer circumferential surface of the integrated plug 450. When the integrated plug 450 is screwed into the through hole 411, even if there is a deviation in the screwing angle, the gap 454 between the annular part 453 and the threaded segment 451 can be connected to the liquid outlet hole 4111 on the hole wall of the through hole 411, so that the cooling liquid in the internal flow passage 430 can enter the shaft hole of the transmission shaft through the oil channel in the integrated plug 450. The fan-shaped channels formed between the two adjacent connecting parts 452 have a sufficient length in the circumferential direction of the annular part 453. When the integrated plug 450 is screwed into the through hole 411 and screwed to different angles, the gap 454 between the annular part 453 and the threaded segment 451 can be connected to the liquid outlet hole 4111 on the hole wall of the through hole 411, so that the cooling liquid in the internal flow passage 430 can enter the shaft hole of the transmission shaft through the oil channel in the integrated plug 450.

[0103] Referring to Figure 11 and Figure 13 , it is shown that Figure 13 a connecting part and an annular part provided in an embodiment of the present application.

[0104] In the embodiment of the present application, the integrated plug 450 is assembled with the through hole 411 by screwing, so as to seal the through hole 411. During the screwing process, the connecting part 452 can be rotated to a plurality of angles, such as the connecting part 452 being completely opposite, partially opposite and completely not opposite to the liquid outlet hole 4111 on the hole wall of the through hole 411. In addition, the integrated plug 450 also participates in the cooling oil flow. The gap 454 in the integrated plug 450 connects the liquid outlet hole 4111 and the central hole 4531, so that the cooling oil in the internal flow passage 430 can enter the internal passage 4551 of the liquid guide pipe 455 through the central hole 4531, thereby cooling each transmission shaft of the power assembly 10.

[0105] In an embodiment, the length L1 of each connecting part 452 in the radial direction of the annular part 453 is less than the radius d1 of the annular part 453. One end of each connecting part 452 is directed to the axis of the annular part 453, and the other end of each connecting part 452 is away from the axis of the annular part 453. Each connecting part 452 is in a strip shape and extends in the radial direction of the annular part 453.

[0106] The length L2 of each connecting part 452 in the radial direction of the annular part 453 is less than the radius d1 of the annular part 453. Please refer toFigure 11 each of the other ends of the connecting pieces 452 can extend to the same plane as the outer circumferential surface of the annular piece 453 along the radial direction of the annular piece 453, or, referring to Figure 13 each of the other ends of the connecting pieces 452 is located radially inward of the outer circumferential surface of the annular piece 453, each of the radially outer ends of the connecting pieces 452 is located in the gap 454 between the annular piece 453 and the threaded section 451, and each of the radially outer ends of the connecting pieces 452 has a certain spacing distance from the outer circumferential surface of the annular piece 453 along the radial direction of the annular piece 453.

[0107] In an embodiment, the connecting pieces 452 can be straight lines, arcs, broken lines, or other irregular shapes, as long as the connecting pieces 452 can fixedly connect the annular piece 453 and the threaded section 451, and there is a gap between adjacent connecting pieces 452 to ensure that the cooling liquid output by the liquid outlet hole 4111 can pass through the gap 454 between the annular piece 453 and the threaded section 451 and enter the central hole of the annular piece 453.

[0108] It should be noted that the connecting pieces 452 are long strips, and the two ends of the connecting pieces 452 are located at the two ends of the connecting pieces 452 along the radial direction of the annular piece 453. Even if the connecting pieces 452 are offset at a certain angle from the radial direction of the annular piece 453, or the connecting pieces 452 are not straight lines, they all belong to the radial direction of the annular piece 453. In this embodiment, in different embodiments in which the connecting pieces 452 can have various shapes, the length of each connecting piece 452 along the radial direction of the annular piece 453 is the difference between the vertical distance of the other end of the connecting piece 452 from the axis of the annular piece 453 and the vertical distance of one end of the connecting piece 452 from the axis of the annular piece 453.

[0109] This embodiment limits the length L2 of each connecting piece 452 along the radial direction of the annular piece 453 to be less than the radius d1 of the annular piece 453, and each other end of the connecting pieces 452 can extend to the same plane as the outer circumferential surface of the annular piece 453 along the radial direction of the annular piece 453 or have a certain spacing distance. When the integrated plug 450 is screwed into the through hole 411, even if there is a deviation in the screwing angle, the connecting piece 452 and the liquid outlet hole 4111 on the hole wall of the through hole 411 are completely or partially opposite, the connecting piece 452 will not completely block the liquid outlet hole 4111, and the space on both sides of the connecting piece 452 can be connected with the liquid outlet hole 4111, ensuring that the cooling liquid in the internal flow passage can enter the transmission shaft through the oil passage in the integrated plug 450.

[0110] Figure 14 For Figure 5 the D-D cross-sectional view, Figure 15 the D-D cross-sectional view,Figure 14 an enlarged view of II in Figure 16 A cooperation schematic view of the liquid outlet hole and the integrated plug provided in the embodiments of the present application.

[0111] In the embodiments of the present application, the liquid outlet hole 4111 is located on the inner wall of the through hole 411, and the gap 454 is open on the circumferential side wall of the integrated plug 450 along the radial direction outside the ring-shaped member 453. The opening on the circumferential side wall can be in communication with the liquid outlet hole 4111. The gap 454 is open at one end along the radial direction inside the ring-shaped member 453 and is in communication with the central hole 4531 of the ring-shaped member 453. The cooling liquid transported by the internal flow channel 430 can enter the gap 454 between the ring-shaped member 453 and the threaded segment 451 through the liquid outlet hole 4111, and then enter the central hole 4531 of the ring-shaped member 453 through the gap 454, and then enter the internal passage 4551 of the liquid guide pipe 455 through the central hole 4531 of the ring-shaped member 453.

[0112] In one embodiment, when the integrated plug 450 is assembled with the through hole 411, the connecting member 452 can be rotated to be completely opposite or partially opposite to the liquid outlet hole 4111 on the hole wall of the through hole 411.

[0113] In one embodiment, refer to Figure 6 , Figure 14 , Figure 15 and Figure 16 . The wall surface on which the liquid outlet hole 4111 on the hole wall of the through hole 411 is located can be coplanar with the internal thread 4112. The wall surface on which the liquid outlet hole 4111 is located is the first wall surface 4113, and the first wall surface 4113 is coplanar with the internal thread 4112. The outer diameter of the ring-shaped member 453 can be smaller than the outer diameter of the threaded segment 451. When the external thread of the threaded segment 451 is connected with the internal thread 4112, along the radial direction of the ring-shaped member 453, there is an annular gap 450a between the outer peripheral surface of the ring-shaped member 453 and the wall surface on which the liquid outlet hole 4111 is located, and the annular gap 450a surrounds the periphery of the gap 454. When the connecting member 452 at the other end is extended to be coplanar with the outer peripheral surface of the ring-shaped member 453 along the radial direction of the ring-shaped member 453, even if the integrated plug 450 is screwed in place and the integrated plug 450 is completely sealed and connected with the through hole 411, the connecting member 452 is just rotated to be opposite to the liquid outlet hole 4111 along the radial direction of the ring-shaped member 453, and there will also be the annular gap 450a between the liquid outlet hole 4111 and the ring-shaped member 453 opposite to it to ensure that the cooling liquid in the liquid outlet hole 4111 can enter the gap 454 on both sides of the connecting member 452, refer to the dotted arrow in Figure 15 .

[0114] Please refer to Figure 15As shown, in an embodiment, the width L2 of each connecting piece 452 along the circumferential direction of the annular piece 453 is less than the hole diameter D2 of the liquid outlet hole 4111 along the circumferential direction of the through hole 411. In the radial direction of the annular piece 453, the width of the connecting piece 452 along the circumferential direction of the annular piece 453 can be uniformly changed or unevenly changed. In the embodiment, the width L2 of the connecting piece 452 along the circumferential direction of the annular piece 453 is the width of the side end surface of the connecting piece 452 away from the center line of the annular piece 453.

[0115] By limiting the width of each connecting piece 452 along the circumferential direction of the annular piece 453 to be less than the hole diameter of the liquid outlet hole 4111 along the axial direction of the through hole 411, even if there is a deviation in the screwing angle when the integrated plug 450 is screwed into the through hole 411, the connecting piece 452 will not completely block the liquid outlet hole 4111 when the liquid outlet hole 4111 on the hole wall of the through hole 411 is completely or partially opposite to one of the connecting pieces 452. The space on both sides of the connecting piece 452 can be connected to the liquid outlet hole 4111, and the cooling liquid in the liquid outlet hole 4111 can enter the gap 454 on both sides of the connecting piece 452, as shown by the dashed arrows in Figure 15 .

[0116] The length of one connecting piece 452 along the circumferential direction of the annular piece 453 is less than the diameter of the liquid outlet hole 4111. This design detail is intended to prevent extreme situations that the integrated plug 450 may encounter during rotation, especially when one end of the connecting piece 452 is aligned with the liquid outlet hole 4111. By setting the length of the connecting piece 452 along the circumferential direction of the annular piece 453 to be less than the diameter of the liquid outlet hole 4111, even if one end of the connecting piece 452 is opposite to the liquid outlet hole 4111, the liquid outlet hole 4111 will not be completely covered by the connecting piece 452, and the cooling liquid discharged from the liquid outlet hole 4111 can enter the gap 454 from both sides of the connecting piece 452. If the length of the connecting piece 452 along the circumferential direction of the annular piece 453 is greater than or equal to the diameter of the liquid outlet hole 4111, the connecting piece 452 will have the possibility of completely covering the liquid outlet hole 4111. At this time, the cooling liquid has the risk of being blocked, and the flow of the cooling liquid will be hindered, resulting in the cooling liquid being unable to effectively enter the reducer 200, and the heat generated by each part of the power assembly 10 cannot be removed in time, thereby causing the temperature of the power assembly 10 to be too high. The temperature of the power assembly 10 being too high not only reduces its working efficiency and affects the performance of the vehicle, but also can cause serious mechanical failures.

[0117] In an embodiment, the gap 454 between the annular piece 453 and the threaded segment 451 along the X direction in Figure 16 is greater than the hole diameter of the liquid outlet hole 4111 along the axial direction of the annular piece 453. See Figure 16As shown, along the axial direction of the annular member 453, the spacing L3 of the gap 454 is greater than the diameter D3 of the outlet hole 4111 along the axial direction of the annular member 453. In this embodiment, along the axial direction of the annular member 453, the gap 454 between the annular member 453 and the threaded section 451 can be uniform or non-uniform. When the gap 454 between the annular member 453 and the threaded section 451 is non-uniform, the minimum gap of the gap 454 between the annular member 453 and the threaded section 451 opening along the radial outer side of the annular member 453 is greater than the diameter of the outlet hole 4111 along the axial direction of the annular member 453.

[0118] This embodiment limits the axial clearance between the annular member 453 and the threaded section 451 to be greater than the diameter of the outlet hole 4111 along the axial direction of the annular member 453. This ensures that when the integrated plug 450 is screwed into the through hole 411, even along the... Figure 16 There is a deviation in the twisting depth in the X direction. Regardless of whether the twisting depth is too shallow or too deep, the gap 454 between the annular part 453 and the threaded section 451 can still connect with the liquid outlet 4111 of the through hole 411. This prevents the annular part 453 from being completely located on the side of the liquid outlet 4111 closer to the threaded section 451 along the axial direction of the annular part 453 when the twisting is too shallow, i.e., the length of the threaded section 451 is less than the length of the internal thread 4112. This prevents the gap 454 between the annular part 453 and the threaded section 451 and the liquid outlet 4111 from being completely blocked by the annular part 453. Furthermore, it prevents the gap 454 between the annular part 453 and the threaded section 451 and the liquid outlet 4111 from being completely blocked by the annular part 453 when the twisting is too deep, i.e., the threaded section 451 is less than the length of the internal thread 4112. When the length of segment 451 is greater than the length of internal thread 4112, the edge of threaded segment 451 at one end near the annular member 453 is completely located on the side of the outlet hole 4111 away from the threaded segment 451 along the axial direction of the annular member 453. That is, along the axial direction of the annular member 453, the edge of the end face of threaded segment 451 in the opposite X direction is completely located on the side of the outlet hole 4111 in the opposite X direction. This prevents the gap 454 between the annular member 453 and threaded segment 451 and the outlet hole 4111 from being completely blocked by threaded segment 451, so as to ensure that the coolant in the internal flow channel can enter the drive shaft through the oil passage in the integrated plug 450.

[0119] In this embodiment, the gap 454 along the axial direction of the annular member 453 is larger than the hole diameter of the liquid outlet hole 4111 along the axial direction of the annular member 453, so that the gap 454 along the axial direction of the annular member 453 has a certain width allowance. When the threaded segment 451 is screwed to the deepest position in the through hole 411, the threaded segment 451 does not have a relative relationship with the liquid outlet hole 4111 along the radial direction of the annular member 453, and the threaded segment 451 does not block and affect the oil flow from the liquid outlet hole 4111 into the gap 454. When the threaded segment 451 is screwed to the through hole 411 close to the deepest position, the annular member 453 does not have a relative relationship with the liquid outlet hole 4111 along the radial direction of the annular member 453, and the annular member 453 does not block and affect the oil flow from the liquid outlet hole 4111 into the gap 454.

[0120] In this embodiment, the liquid guide pipe 455 is in communication with the central hole 4531 of the annular member 453, the internal passage 4551 of the liquid guide pipe 455 is in communication with the central hole 4531 of the annular member 453, the liquid guide pipe 455 extends along the negative X direction and is used to extend into the shaft hole of a transmission shaft in the power assembly 10, for example, into the shaft hole 211 of the input shaft 210. Figure 6 The cooling liquid in the internal flow channel 430 is used to flow along the liquid outlet hole 4111, the gap 454 between the annular member 453 and the threaded segment 451, the central hole 4531 of the annular member 453, and the internal passage 4551 of the liquid guide pipe 455 in sequence, and then flows from the other end of the liquid guide pipe 455 into the shaft hole of the transmission shaft, for example, into the shaft hole 211 of the input shaft 210.

[0121] Referring to Figure 6 and Figure 10As shown, in one embodiment, the outer diameter D4 of the liquid guide tube 455 is smaller than the outer diameter D5 of the annular member 453. The liquid guide tube 455 is cylindrical, and the annular member 453 can be a disc with a central hole 4531 in the middle. The outer diameter D4 of the liquid guide tube 455 is smaller than the outer diameter D5 of the annular member 453. The outer diameter of the liquid guide tube 455 can be smaller than the inner diameter of the shaft hole of the input shaft 210 of the reducer 200. The liquid guide tube 455 can extend into the input shaft 210 to inject coolant into the shaft hole. The outer diameter D4 of the annular component 453 can be larger than the inner diameter of the shaft hole 211 of the input shaft 210 of the reducer 200. After the integrated plug 450 is screwed into the through hole 411, the fluid guide tube 455 can extend into the reducer shaft cavity 213 of the input shaft 210, while the annular component 453 cannot extend into the reducer shaft cavity 213. The annular component 453 limits the screwing fit position of the integrated plug 450 and the through hole 411 along its axial direction. The length of the fluid guide tube 455 along the axial direction of the annular component 453 is greater than the gap 454 between the annular component 453 and the threaded section 451. See also... Figure 10 As shown, the annular component 453 along Figure 10 The thickness L4 in the X direction is less than the distance L5 of the gap 454 between the annular part 453 and the threaded section 451, while the axial length L6 of the liquid guide tube 455 along the annular part 453 is greater than the distance L5 of the gap 454 between the annular part 453 and the threaded section 451. The outer diameter D4 of the liquid guide tube 455 is less than the outer diameter D5 of the annular part 453. The part that can extend into the reducer shaft cavity 213 of the reducer 200 is the liquid guide tube 455, and the annular structure between the liquid guide tube 455 and the threaded section 451 is the annular part 453.

[0122] The inner diameter D6 of the liquid guide tube 455 is greater than or equal to the inner diameter D7 of the center hole 4531 of the annular component 453. Wherein: the liquid guide tube 455 along... Figure 10 The opposite end of the X-shaped part can be opposite to the center hole 4531 of the annular part 453 along the threaded section 451. Figure 10 The opening on one side in the X direction is connected, and the inner diameter of the liquid guide tube 455 is equal to the inner diameter D7 of the central hole of the annular part 453; or, the liquid guide tube 455 along the... Figure 10 The opposite end of the X-shaped part can be opposite to the threaded section 451 of the annular part 453. Figure 10 The end face connection on one side in the X direction allows the inner diameter D6 of the liquid guide tube 455 to be larger than the inner diameter D7 of the center hole of the annular part 453.

[0123] The embodiment limits the size relationship between the outer diameter of the liquid guide pipe 455 and the ring member 453, the axial length of the liquid guide pipe 455 along the ring member 453, and the size relationship between the inner diameter of the liquid guide pipe 455 and the inner diameter of the central hole 4531 of the ring member 453, to limit the insertion of the liquid guide pipe 455 in the integrated plug 450 into the shaft hole of the input shaft 210 of the speed reducer 200 to inject cooling liquid into the shaft hole, to ensure that the cooling liquid is not hindered when entering the liquid guide pipe 455 from the central hole 4531 of the ring member 453 in the integrated plug 450, and that the cooling liquid injected from the liquid outlet hole 4111 on the hole wall of the through hole 411 can smoothly pass through the central hole 4531 of the ring member 453 and enter the liquid guide pipe 455, to ensure that the speed of the cooling liquid flowing into the input shaft 210 of the speed reducer 200 is moderate. The ring member 453 cannot be inserted into the shaft hole of the input shaft 210 of the speed reducer 200, and the axial position of the screwing fit of the integrated plug 450 and the through hole 411 is limited by the ring member 453, which further ensures that different integrated plugs 450 can be inserted into the through hole 411 to the same or similar depth when fitted with different housings 400, and the gap 454 between the ring member 453 and the threaded segment 451 and the liquid outlet hole 4111 in the through hole 411 can be connected in the axial direction of the ring member 453.

[0124] Referring to Figure 6 and Figure 10 In the embodiment of the present application, the threaded segment 451 of the integrated plug 450 is fitted with the internal thread 4112 during assembly, and when the integrated plug 450 is screwed into the through hole 411, there may be a deviation in the screwing depth in the X direction, which may be too shallow or too deep. Figure 16

[0125] In one embodiment, the outer diameter D5 of the ring member 453 and the outer diameter D8 of the threaded segment 451 are greater than the inner diameter of the annular gap 450a shaft hole. In the embodiment, the shaft hole can be the speed reducer shaft cavity 213 in the input shaft 210, the inner diameter of the annular gap 450a shaft hole is the inner diameter D9 of the speed reducer shaft cavity 213, and the outer diameter D5 of the ring member 453 is smaller than the outer diameter D8 of the threaded segment 451.

[0126] The outer diameter of the ring member 453 is greater than the inner diameter of the annular gap 450a shaft hole, the outer diameter of the threaded segment 451 is also greater than the inner diameter of the annular gap 450a shaft hole, the outer diameter of the ring member 453 is smaller than the outer diameter of the threaded segment 451, and as the liquid guide pipe 455 is inserted into the speed reducer shaft cavity 213 of the input shaft 210, the outer diameter of the ring member 453 is greater than the inner diameter D9 of the speed reducer shaft cavity 213, and the ring member 453 forms a barrier structure, which limits the axial position of the integrated plug 450 and the through hole 411 along the input shaft 210, and further ensures that different integrated plugs 450 can be inserted into the through hole 411 to the same or similar depth when fitted with different housings 400, and the gap 454 between the ring member 453 and the threaded segment 451 and the liquid outlet hole 4111 in the through hole 411 can be connected in the axial direction of the ring member 453. Figure 6 ​The gap between the end faces of the middle X direction end face forms a first oil retaining structure to prevent oil leakage. In addition, the outer diameter of the annular member 453 is smaller than the outer diameter of the threaded section 451, and the threaded section 451 forms another similar retaining wall structure to form a second oil retaining structure between the annular member 453 and the threaded section 451 to prevent the cooling liquid from leaking out of the threaded section 451.

[0127] When the integrated plug 450 is assembled, the annular member 453 does not extend into the reducer shaft cavity 213, and the end of the input shaft 210 can limit the maximum depth of the annular member 453 inserted into the through hole 411 in the axial direction to prevent the integrated plug 450 from being inserted into the through hole 411 to a greater depth, which causes the gap 454 between the annular member 453 and the threaded section 451 and the liquid outlet hole 4111 on the hole wall of the through hole 411 to be misaligned in the axial direction of the annular member 453, and ensures that after the integrated plug 450 is installed in place in the through hole 411, the gap 454 between the annular member 453 and the threaded section 451 and the liquid outlet hole 4111 can be kept in communication in the axial direction of the annular member 453.

[0128] The outer diameter of the annular member 453 is smaller than the outer diameter of the threaded section 451, and the threaded section 451 and the internal thread on the inner wall of the through hole 411 are engaged, the distance of the liquid outlet hole 4111 from the center line of the through hole 411 can be equal to the inner diameter of the internal thread 4112, the distance of the liquid outlet hole 4111 from the center line of the through hole 411 can be equal to the outer diameter of the threaded section 451, and the distance of the liquid outlet hole 4111 from the center line of the through hole 411 is greater than the outer diameter of the annular member 453, so that when the integrated plug 450 is screwed into the through hole 411, even if there is an error in the screwing angle, there is always a spacing between the gap 454 between the annular member 453 and the threaded section 451 and the liquid outlet hole 4111 to ensure that the cooling liquid in the liquid outlet hole 4111 can flow into the gap 454 between the annular member 453 and the threaded section 451.

[0129] In an embodiment, the reducer end cover 410 on the power assembly 10 includes a through hole 411, wherein the through hole 411 axially penetrates the reducer end cover 410 along the integrated plug 450. The through hole 411 is provided on the side of the housing 400 reducer end cover 410, which is more convenient for operators to observe and operate, and is beneficial for operators to overhaul the reducer 200. Operators can clearly observe the key components such as gears and bearings in the reducer 200, and can also observe the condition of the cooling liquid in time and replenish or replace it, to ensure the normal operation of the electric vehicle 1.

[0130] Figure 17 A partial cross-sectional view of the power assembly 10 is provided for the embodiments of the present application, Figure 18 A partial cross-sectional view of the power assembly 10 is provided for the embodiments of the present application,

[0131] Referring toFigure 7 , Figure 17 and Figure 18 As shown in this embodiment, the through hole 411 further includes an inner opening 4114 and an outer opening 4115. The inner diameter of the inner opening 4114 is smaller than the inner diameter of the outer opening 4115. This narrower inner and wider outer design facilitates the insertion of the integrated plug 450. The outer diameter of the mating annular member 453 is smaller than the outer diameter of the threaded section 451. The smaller inner diameter of the inner opening 4114 and the even smaller outer diameter of the annular member 453 allow for a better fit. (See also...) Figure 15 As shown, the inner diameter of the inner opening 4114 on the inner side of the housing and Figure 15 The inner diameter of the second wall surface 4116 is the same. The inner opening 4114 of the housing can be an opening on the side of the second wall surface 4116 away from the threaded section 451. The outer opening 4115 of the housing can be an opening on the outer side of the internal thread 4112 on the reducer end cover 410. The smaller inner diameter of the inner opening 4114 of the housing can better match the annular part 453 with a smaller outer diameter, and the larger inner diameter of the outer opening 4115 of the housing can better match the threaded section 451 with a larger outer diameter. For a structure like the powertrain 10 that requires sealing, the design of being narrow inside and wide outside can better match sealing materials such as sealing gaskets or sealants to form an effective sealing structure, which helps to prevent coolant leakage from the through hole 411 and improves the overall sealing performance of the powertrain 10.

[0132] In this embodiment, the inner diameter of the inner opening 4114 of the housing is smaller than the outer diameter of the threaded section 451. This setting can limit the integrated plug 450 and limit the maximum depth to which the integrated plug 450 is screwed into the through hole 411, without affecting the fit of other parts in the powertrain 10.

[0133] Please see Figure 15 In this embodiment of the application, the inner diameter of the inner opening 4114 of the housing is greater than or equal to the outer diameter of the annular member 453. This setting allows the annular member 453 to fit against the second wall surface 4116, or the annular member 453 to form another annular gap 450b between the second wall surface 4116. The annular member 453 can be screwed into the through hole 411 along with the threaded section 451, and the wall surface of the through hole 411 will not generate a large friction with the annular member 453.

[0134] See Figure 10 and Figure 17As shown, in an embodiment, along the axial direction of the ring-shaped member 453, the distance L7 between the liquid outlet hole 4111 and the outer opening 4115 of the shell is greater than the length L8 of the threaded segment 451. The distance between the liquid outlet hole 4111 and the outer opening 4115 of the shell refers to the distance from the point closest to the outer opening 4115 of the shell to the liquid outlet hole 4111. In this embodiment, when the integrated plug 450 is screwed to the deepest position relative to the through hole 411, the threaded segment 451 is not opposite to the liquid outlet hole 4111 along the radial direction of the threaded segment 451, and does not affect the flow speed of the cooling liquid from the liquid outlet hole 4111 to the gap 454. The threaded segment 451 only plays a sealing and fixing role and does not affect the flow of the cooling liquid.

[0135] In an embodiment of the present application, along the axial direction of the ring-shaped member 453, the distance L9 between the liquid outlet hole 4111 and the inner opening 4114 of the shell is greater than the thickness L10 of the ring-shaped member 453. The distance between the liquid outlet hole 4111 and the inner opening 4114 of the shell refers to the distance from the point closest to the inner opening 4114 of the shell to the liquid outlet hole 4111. The thickness of the ring-shaped member 453 refers to the maximum length along the axial direction of the ring-shaped member 453. In combination with the above-mentioned inner diameter of the inner opening 4114 of the shell being greater than or equal to the outer diameter of the ring-shaped member 453, when the ring-shaped member 453 is screwed into the through hole 411 along with the threaded segment 451, at the deepest position or close to the deepest position, the ring-shaped member 453 will not be opposite to the liquid outlet hole 4111 along the radial direction of the ring-shaped member 453, which ensures that the ring-shaped member 453 will not affect the flow speed of the cooling liquid from the liquid outlet hole 4111 to the gap 454, and ensures the reasonable assembly of the integrated plug 450 and the through hole 411. Since the ring-shaped member 453 does not cover the liquid outlet hole 4111, it can ensure the smooth flow of the cooling liquid, which is conducive to the flow of the cooling liquid and prevents assembly errors and other factors from affecting the flow of the internal flow channel.

[0136] In an embodiment, referring to Figure 7 , Figure 8 , Figure 9 and Figure 10 , the integrated plug 450 further comprises an exposed segment 456 for fixedly connecting one end of the threaded segment 451. The exposed segment 456 is located on the side of the threaded segment 451 away from the ring-shaped member 453. The exposed segment 456 has a hollow through cavity. The threaded segment 451 has a groove, which is in communication with the through cavity to form an outwardly open groove on the integrated plug 450. The groove is provided with a structure suitable for assembly, such as a hexagonal groove, which facilitates the assembly of the integrated plug 450 and the through hole 411 by an operator using a hexagonal wrench or other assembly tool.

[0137] In the embodiment of the present application, the other end of the threaded segment 451 is used to extend into the through hole 411, and the other end of the threaded segment 451 is directed towards the end face of the annular member 453, and is used to be fixedly connected with the annular member 453 through the plurality of connecting members 452. The annular member 453, the plurality of connecting members 452 and the threaded segment 451 are in an integrated structure to constitute the integrated plug 450.

[0138] Figure 19 An exploded schematic view of the through hole 411, the sealing ring 440 and the integrated plug 450 provided in the embodiment of the present application is shown in the drawings of the present application, and in the embodiment of the present application, it is shown in the drawings that Figure 6 and Figure 19 The outer side opening 4115 of the housing includes an annular groove 4117 for accommodating the sealing ring 440, and the inner diameter of the sealing ring 440 is greater than the outer diameter of the threaded segment 451 and is less than the outer diameter of the exposed segment 456. The cooperation between the sealing ring 440 and the annular groove 4117 can form a tight sealing interface, which effectively prevents the leakage of the cooling liquid. Secondly, the annular groove 4117 fixes and positions the sealing ring 440, which avoids the sliding or rotation of the sealing ring 440 during the installation and use process. This fixing effect not only ensures the accurate butt joint between the sealing ring and the sealing groove, but also improves the stability and reliability of the sealing ring 440. At the same time, the annular groove 4117 can effectively prevent the sealing ring 440 from falling off or being damaged when subjected to external force, thereby prolonging the service life of the sealing ring 440. The cooperation design of the sealing ring 440 and the annular groove 4117 also makes the installation and disassembly process more convenient. During installation, the sealing ring 440 can be fixed at the desired position by using the integrated plug 450. This installation method not only saves time and effort, but also reduces the installation difficulty and cost. During disassembly, the sealing ring 440 can be easily taken out of the annular groove 4117 by unscrewing the integrated plug 450, which is convenient for maintenance and replacement. In addition, since the sealing ring 440 is easy to replace and simple to install, this cooperation mode can also reduce the maintenance cost and time of the equipment.

[0139] Figure 20 An end face contact sealing ring 441 schematic view provided in the embodiment of the present application is shown in the drawings of the present application, and in the embodiment of the present application, it is shown in the drawings that Figure 20 In an embodiment, the sealing ring 440 is an end face contact sealing ring 441, and the cross section of the end face contact sealing ring 441 is a pentagon, and the three internal angles of the pentagon are all right angles. The end face contact sealing ring 441 realizes sealing by using two plane contacts, and the sealing effect is very good and is not easy to leak.

[0140] Figure 21 An angle contact sealing ring 442 schematic view provided in the embodiment of the present application is shown in the drawings of the present application, and in the embodiment of the present application, it is shown in the drawings that Figure 21As shown, in one embodiment, the sealing ring 440 is an angular contact sealing ring 442, and the cross-section of the angular contact sealing ring 442 is circular. The angular contact sealing ring 442 can simultaneously withstand radial force and axial force, as well as a certain torque, to ensure a complete seal between the integrated plug 450 and the through hole 411.

[0141] In one embodiment, see [reference] Figure 6 , Figure 15 and Figure 18 As shown, the inner opening 4114 of the housing includes an annular protrusion 4118. The protrusion direction of the annular protrusion 4118 faces the centerline of the through hole 411, and the inner diameter of the annular protrusion 4118 is greater than or equal to the outer diameter of the annular member 453. On the side of the annular protrusion 4118 facing the centerline of the through hole 411, there is a second wall surface 4116. Another annular gap 450b exists between the second wall surface 4116 and the annular member 453. The inner diameter of the annular protrusion 4118 is greater than or equal to the outer diameter of the annular member 453, allowing the second wall surface 4116 to cooperate with the annular member 453 to form another annular gap 450b. This other annular gap 450b is smaller than the radial gap between the annular member 453 and the internal thread 4112, preventing a large gap between the annular member 453 and the inner wall of the through hole 4111, and preventing coolant discharged from the outlet hole 4111 from leaking from the periphery of the annular member 453.

[0142] In one embodiment, the number of annular protrusions 4118 can be one, and the annular protrusions 4118 can be in the form of a complete ring structure. Alternatively, they can be divided into multiple parts, such as two, three, four or more, depending on the situation. Multiple parts are arranged around the axial direction of the annular member 453 and spaced apart to form the annular protrusions 4118.

[0143] In one embodiment, see [reference] Figure 15 and Figure 18 As shown, the annular protrusion 4118 is provided with another groove 4119. The number of grooves 4119 can be one, two or more, and multiple grooves 4119 are arranged at intervals around the central axis of the annular protrusion 4118.

[0144] The groove 4119 connects the two sides of the annular member 453 along the axial direction of the annular member 453, so as to provide a passage for supplying coolant to the shaft hole of the drive shaft by setting another liquid outlet hole 4111 on the periphery of the annular member 453. By setting the size and number of grooves 4119, the flow ratio between this passage and the passage inside the integrated plug 450 can be adjusted to be appropriate.

[0145] See Figure 6As shown, in an embodiment, the housing 400 comprises an internal flow channel 430, the groove bottom of the reducer bearing groove 420 further comprises another liquid outlet hole 421, the liquid outlet hole 421 and the liquid outlet hole 4111 receive the cooling liquid through the internal flow channel 430, wherein:

[0146] The axis of the liquid outlet hole 4111 is perpendicular to the axis of the reducer bearing groove 420, the axis of the liquid outlet hole 421 is parallel to the axis of the reducer bearing groove 420, and the aperture of the liquid outlet hole 4111 is larger than the aperture of the liquid outlet hole 421.

[0147] In this embodiment, by arranging the liquid outlet hole 421 on the groove bottom of the reducer bearing groove 420, the liquid outlet hole 421 and the internal flow channel 430 are connected, the cooling liquid in the internal flow channel 430 can partially enter the reducer bearing groove 420 through the liquid outlet hole 421 to cool the bearing, and another part of the cooling liquid can enter the integrated plug 450 through the liquid outlet hole 4111, and then enter the shaft hole of the transmission shaft to cool the transmission shaft. In addition, the aperture of the liquid outlet hole 4111 is larger than the aperture of the liquid outlet hole 421, the axis of one liquid outlet hole 421 is parallel to the flow direction of the internal flow channel 430, and most of the cooling liquid in the internal flow channel 430 can flow into the shaft hole of the transmission shaft through one liquid outlet hole 421, thereby effectively controlling the volume of the cooling liquid in the transmission shaft and the bearing groove and reasonably distributing the amount of cooling liquid.

[0148] Referring to Figure 6 As shown, in an embodiment, the power assembly 10 further comprises another liquid guide pipe 600, the shaft hole of one of the motor shaft 110 of the motor 100 or the input shaft 210 of the reducer 200 is used to accommodate the liquid guide pipe 600, one end of the liquid guide pipe 600 is used to extend into the liquid guide pipe 455, and the other end of the liquid guide pipe 600 is used to extend into the shaft hole of the other of the motor shaft 110 of the motor 100 or the input shaft 210 of the reducer 200. In this embodiment, the end extending into the shaft hole of the input shaft 210 of the reducer 200 is taken as an example, the inner diameter of one liquid guide pipe 600 is larger than the inner diameter D7 of the central hole 4531 of the annular member 453, so as to ensure that the cooling liquid discharged by the annular member 453 can flow into the other liquid guide pipe 455 through one liquid guide pipe 600, and the flow process does not exist a flow section area reducing flow section, and a better and more uniform flow velocity is maintained to enter the other liquid guide pipe 455, which is beneficial to adjusting the flow velocity of the cooling liquid to meet the cooling of the motor shaft 110 or the input shaft 210.

[0149] The above examples are only used to illustrate the technical solutions of the present application, but not limit the same; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can be modified, or some technical features can be replaced by equivalent ones; 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, characterized by, The housing of the power assembly comprises a through hole and an integrated plug, the through hole is communicated between the inside and outside of the housing, the integrated plug is used to pass through the through hole, the integrated plug comprises a threaded section, a ring member and a plurality of connecting members, wherein: the threaded section is used to extend into the through hole and engage with the internal thread of the through hole, the ring member is used to fixedly connect the threaded section through the connecting members from one side of the threaded section, and the ring member is used to fixedly connect one end of a liquid guide tube from the other side of the threaded section; the hole wall of the through hole comprises a liquid outlet hole, the connecting members are used to separate the ring member and the threaded section, the gap between the ring member and the threaded section is used to communicate the central hole of the ring member and the liquid outlet hole, the central hole of the ring member is used to communicate the liquid guide tube, and the other end of the liquid guide tube is used to extend into the shaft hole of a transmission shaft in the power assembly.

2. The powertrain of claim 1, wherein, The connecting members are arranged around the axis of the ring member, one end of each connecting member is directed to the axis of the ring member, the other end of each connecting member is away from the axis of the ring member, and the interval of the one ends of two adjacent connecting members along the circumferential direction of the ring member is smaller than the interval of the other ends.

3. The powertrain of any of claims 1-2, wherein, The length of each connecting member along the radial direction of the ring member is smaller than the radius of the ring member.

4. The powertrain of any one of claims 1-3, wherein, The width of each connecting member along the circumferential direction of the ring member is smaller than the hole diameter of the liquid outlet hole along the circumferential direction of the through hole.

5. The powertrain of any one of claims 1-4, wherein, The gap between the ring member and the threaded section along the axial direction of the ring member is greater than the hole diameter of the liquid outlet hole along the axial direction of the ring member.

6. The powertrain of any one of claims 1-5, wherein, The outer diameter of the liquid guide tube is smaller than the outer diameter of the ring member, the inner diameter of the liquid guide tube is greater than or equal to the inner diameter of the central hole of the ring member, and the length of the liquid guide tube along the axial direction of the ring member is greater than the gap between the ring member and the threaded section.

7. The powertrain of any one of claims 1-6, wherein, The outer diameter of the ring member and the outer diameter of the threaded section are greater than the inner diameter of the shaft hole, and the outer diameter of the ring member is smaller than the outer diameter of the threaded section.

8. The powertrain of any one of claims 1-7, wherein, The through hole penetrates the housing along the axial direction of the ring member, the through hole comprises a housing inside opening and a housing outside opening, the inner diameter of the housing inside opening is smaller than the inner diameter of the housing outside opening, smaller than the outer diameter of the threaded section and greater than or equal to the outer diameter of the ring member.

9. The powertrain of claim 8, wherein, Along the axial direction of the ring member, the distance between the liquid outlet hole and the housing outside opening is greater than the length of the threaded section, and the distance between the liquid outlet hole and the housing inside opening is greater than the thickness of the ring member.

10. The powertrain of claim 8, wherein, The one integrated plug further comprises an exposed section for fixedly connecting one end of the one threaded section, the other end of the one threaded section for extending into the one through hole, the other end of the one threaded section towards the end face of the one ring-shaped member for fixedly connecting the one ring-shaped member through the plurality of connecting members, the one housing outside opening comprises an annular groove for accommodating a sealing ring, the inner diameter of the sealing ring is greater than the outer diameter of the one threaded section and less than the outer diameter of the one exposed section.

11. The powertrain of claim 8, wherein, The one housing inside opening comprises an annular protrusion, the protrusion direction of the annular protrusion towards the center line of the one through hole, the inner diameter of the one annular protrusion is greater than or equal to the outer diameter of the one ring-shaped member.

12. The power assembly according to any one of claims 1-11, the power assembly comprises one motor, one speed reducer and a plurality of the transmission shafts, the plurality of transmission shafts comprises the motor shaft of the one motor and the input shaft of the one speed reducer, the motor shaft of the one motor for drivingly connecting the input shaft of the one speed reducer, the housing of the power assembly for accommodating at least one of the motor or the speed reducer, the housing comprises one bearing groove for fixing the bearing of the motor shaft of the one motor or the input shaft of the one speed reducer, the one through hole penetrates the groove bottom of the one bearing groove along the center line direction of the one through hole.

13. The power assembly according to any one of claims 1-11, the housing comprises one internal flow channel, the groove bottom of the one bearing groove further comprises another liquid outlet hole, the another liquid outlet hole and the one liquid outlet hole receive the cooling liquid through the one internal flow channel, wherein: the axis of the one liquid outlet hole is perpendicular to the axis of the one bearing groove, the axis of the another liquid outlet hole is parallel to the axis of the one bearing groove, the aperture of the one liquid outlet hole is greater than the aperture of the another liquid outlet hole.

14. The power assembly according to claim 13, the power assembly further comprises another liquid guide pipe, the shaft hole of one of the motor shaft of the one motor or the input shaft of the one speed reducer for accommodating the another liquid guide pipe, one end of the another liquid guide pipe for extending into the one liquid guide pipe, the other end of the another liquid guide pipe for extending into the shaft hole of the other one of the motor shaft of the one motor or the input shaft of the one speed reducer, the inner diameter of the one liquid guide pipe is greater than the inner diameter of the center hole of the one ring-shaped member.

15. An electric vehicle characterized by comprising: A vehicle comprising a plurality of wheels and the power assembly according to any one of claims 1-14, the power assembly for driving one or more of the wheels.

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