Dual-electric-motor power assembly and electric vehicle

Abstract

Provided in the present application are a dual-electric-motor power assembly and an electric vehicle. The housing of the dual-electric-motor power assembly comprises a middle partition plate, the middle partition plate divides the housing into two accommodating cavities, each accommodating cavity is used for accommodating an electric motor and a speed reducer, the middle partition plate is used for fixing a conductive member and two bearings, and the middle partition plate comprises two bearing grooves and a through hole. The through hole runs through the groove bottoms of the two bearing grooves in the axial direction of the dual-electric-motor power assembly, the conductive member passes through the through hole in the axial direction of the dual-electric-motor power assembly, two conductive ends of the conductive member are arranged on two sides of the middle partition plate, and each conductive end is used for electrical connection to an electric-motor shaft. By means of providing a through hole in the middle partition plate and configuring the conductive member to pass through the through hole, the two conductive ends are electrically connected to the electric-motor shafts in the two accommodating cavities, thereby conducting an electric current of the bearings and the electric-motor shafts to the middle partition plate, realizing bearing grounding to the housing and reducing electrical corrosion of the bearings. The grounding of two electric motors is realized by the single conductive member passing through the through hole, resulting in fewer parts, simple assembly and fast installation.

Description

Dual-motor power assembly and electric vehicle

[0001] The present application claims priority to the Chinese patent application No. 202411045589.7, filed on July 31, 2024, entitled "Dual-motor power assembly and electric vehicle", the entire content of which is incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of electric vehicles, in particular to a dual-motor power assembly and an electric vehicle. BACKGROUND

[0003] The dual-motor power assembly includes two motors, and the motors generate common-mode voltage and differential-mode voltage during operation. The voltage exists between the motor shaft and the housing of the dual-motor power assembly for a long time, causing the bearing gap fixed to the motor shaft to discharge randomly, resulting in discharge corrosion of the bearing balls and raceways, making the bearing produce abnormal noise and affecting the noise performance of the vehicle. Therefore, the motor shaft needs to be grounded. However, in the current dual-motor power assembly, a grounding assembly is connected to each motor shaft of the two motors, which has more components, complicated assembly, and is prone to make the axial size of the dual-motor power assembly larger, affecting the layout of the dual-motor power assembly in the vehicle. SUMMARY

[0004] The present application provides a dual-motor power assembly and an electric vehicle.

[0005] In a first aspect, the present application provides a dual-motor power assembly. The housing of the dual-motor power assembly includes a middle partition plate. The middle partition plate divides the housing into two accommodating cavities arranged along the axial direction of the dual-motor power assembly. Each accommodating cavity is used to accommodate a motor and a reducer. An electric machine shaft of each motor is used to drivingly connect an input shaft of each reducer. The middle partition plate is used to fix a conductive piece and two bearings. The conductive piece is used to electrically connect the two motor shafts and the middle partition plate. The middle partition plate includes two bearing grooves and a through hole. The grooves of the two bearing grooves are oppositely directed along the axial direction of the dual-motor power assembly. Each bearing groove is used to fix a bearing. Each bearing is used to fixedly connect or drivingly connect a motor shaft through an input shaft. The through hole penetrates the groove bottoms of the two bearing grooves along the axial direction of the dual-motor power assembly. The conductive piece penetrates the through hole along the axial direction of the dual-motor power assembly. The conductive piece includes two conductive ends. The two conductive ends are arranged on the two sides of the middle partition plate along the axial direction of the dual-motor power assembly. Each conductive end is used to electrically connect a motor shaft.

[0006] In the embodiment of the present application, the through hole penetrates the bottom of the two bearing grooves along the axial direction of the double-motor power assembly, so that the conductive part can penetrate the bottom of the two bearing grooves. The conductive part passes through the through hole along the axial direction of the double-motor power assembly, so that the conductive part can be electrically connected with the motor shafts of the two motors in the two accommodating cavities respectively. The conductive part includes two conductive ends arranged on the two sides of the partition plate along the axial direction of the double-motor power assembly, and each conductive end is used for electrically connecting a motor shaft, so that one conductive part can receive the current from the motor shafts of the two motors in the two accommodating cavities and conduct the current to the partition plate, thereby achieving the grounding of the two motor shafts, so that the current generated by the bearing fixed to the motor shaft can be conducted to the partition plate and the shell through the motor shaft and the conductive part, thereby reducing the electric corrosion of the bearing, keeping the surface of the bearing smooth, reducing the wear of the bearing, and protecting the working effect of the two motors.

[0007] In the embodiment of the present application, the through hole of the partition plate enables the conductive part to be fixed to the partition plate and pass through the two accommodating cavities, the installation process of the conductive part is simple, and only two conductive ends of one conductive part are used to electrically connect the motor shafts of the two motors, so that the bearing fixed to the motor shaft can conduct the generated current to the partition plate through the conductive part, the number of parts of the conductive part is small, and the assembly of the conductive grounding structure is simple. The small number of parts of the conductive part can also reduce the assembly cost of the production line and the management cost of the material code.

[0008] In one embodiment, one through hole is coaxial with each bearing groove, and the diameter of one through hole is smaller than the inner diameter of each bearing.

[0009] In the embodiment of the present application, each bearing groove is used for fixing a bearing, and each bearing is used for fixedly connecting or drivingly connecting a motor shaft through an input shaft. The through hole is coaxial with each bearing groove, so that the motor shaft or input shaft fixedly connected with each bearing can be coaxial with the through hole, and the conductive part passes through the through hole along the axial direction of the double-motor power assembly, so that the conductive part is coaxial with the two motor shafts or the two input shafts, and the two conductive ends of the conductive part are electrically connected with the two motor shafts respectively, so that the current generated by the bearing fixed to the motor shaft can be conducted to the partition plate through the motor shaft, the two conductive ends of the conductive part and the conductive part, thereby reducing the electric corrosion of the bearing, keeping the surface of the bearing smooth, reducing the wear of the bearing, and protecting the working effect of the two motors.

[0010] In the embodiment of the present application, each bearing is used for fixedly connecting or drivingly connecting a motor shaft through an input shaft, and the diameter of the through hole is smaller than the inner diameter of each bearing, so that the two conductive ends of the conductive part along the axial direction of the double-motor power assembly can smoothly pass through the through hole and be electrically connected with the motor shafts respectively, and the installation process of the conductive part is simple, and the assembly difficulty can be reduced.

[0011] In an embodiment, the two bearing grooves have the same depth along the axial direction of the dual-motor power assembly, and the length of the through hole is less than the depth of each bearing groove.

[0012] In the embodiment, the through hole penetrates the groove bottoms of the two bearing grooves along the axial direction of the dual-motor power assembly, and the two bearing grooves have the same depth, so that the spacing between the through hole and the groove openings of the two bearing grooves along the axial direction of the dual-motor power assembly is equal, and the partition plate is a symmetric structure, so that the spacing between the two motor shafts and the through hole is the same, which is conducive to the balance of the two motors after the conductive part is installed and positioned.

[0013] In the embodiment, the length of the through hole is less than the depth of each bearing groove, and the length of the through hole is relatively small, which means that the thickness of the partition plate along the axial direction of the dual-motor power assembly is relatively small, and this is conducive to the smooth passage of the conductive part through the through hole and the electrical connection of the conductive part to the two motor shafts. The length of the through hole is less than the depth of each bearing groove, so that when the conductive part is fixed to the partition plate through the through hole, the conductive part can be electrically connected to the two motor shafts by using the space along the axial direction of the dual-motor power assembly between the two bearing grooves, thereby facilitating the reduction of the axial size of the dual-motor power assembly as a whole, the miniaturization of the dual-motor power assembly, and the arrangement of the dual-motor power assembly in the vehicle.

[0014] In an embodiment, the groove bottom of one bearing groove includes a recess, and the recess is recessed away from the groove opening of one bearing groove along the axial direction of the dual-motor power assembly. Along the radial direction of the dual-motor power assembly, the groove width of one bearing groove is greater than the groove width of one recess. Along the axial direction of the dual-motor power assembly, one through hole penetrates the groove bottom of one recess, and the groove bottom of one recess is used to fix one conductive part. The spacing between the groove opening of one bearing groove and one through hole is greater than the spacing between the groove opening of the other bearing groove and one through hole.

[0015] In the embodiment, the groove bottom of one bearing groove includes a recess, and the conductive part penetrates the groove bottom of one bearing groove, so that the conductive part also penetrates the groove bottom of the recess. The groove bottom of the recess is used to fix the conductive part. For example, the recess is used to accommodate a structural part for fixing the conductive part. The spacing between the structural part for fixing the conductive part and the two motor shafts is the same, thereby facilitating the balance of the connection of the two ends of the conductive part to the two motors, and making the overall structure of the dual-motor power assembly more stable. Also, the design of the conductive part as a symmetric structure along the axial direction of the dual-motor power assembly can also balance the electrical connection of the conductive part to the two motor shafts. The design of the conductive part as a symmetric structure is conducive to the regularity of the structure of the conductive part and the convenience of processing.

[0016] In the embodiment of the present application, the width of the one bearing groove is greater than the width of the groove, so that the conductive part can be directly fixed in the one bearing groove when passing through the bottom of the groove, and the space of the middle plate along the radial direction of the double-motor power assembly is not occupied too much. The thickness of the part of the middle plate along the axial direction of the double-motor power assembly is relatively thin, which may weaken the structural strength of the middle plate. The width of the one bearing groove being greater than the width of the groove is also conducive to making the structural range of the part of the middle plate where the groove is provided smaller, and conducive to guaranteeing the structural reliability of the middle plate.

[0017] In the embodiment of the present application, the distance between the one bearing groove and the through hole is greater than the distance between the other bearing groove and the through hole along the axial direction of the double-motor power assembly, so that the length of the conductive part passing through the two sides of the bottom of the groove along the axial direction of the double-motor power assembly can be equal, which is conducive to the balance of the conductive part and the two motor shaft connecting structures, thereby ensuring the balance stability of the double-motor power assembly.

[0018] In one embodiment, one middle plate includes two surfaces opposite along the axial direction of the double-motor power assembly, one surface includes a plurality of mounting holes, and the opening of each mounting hole along the axial direction of the double-motor power assembly faces the opening of the one bearing groove. The plurality of mounting holes are used to fix one conductive part. Wherein, the plurality of mounting holes surround the one through hole along the circumferential direction of the double-motor power assembly. The plurality of mounting holes are arranged between the one through hole and the groove wall of the one bearing groove along the radial direction of the double-motor power assembly.

[0019] In the embodiment of the present application, one surface includes a plurality of mounting holes, and the opening of each mounting hole along the axial direction of the double-motor power assembly faces the opening of the one bearing groove, so that the conductive part can be fixed by the plurality of mounting holes and the surface of the middle plate, and the assembly process of the conductive part is simple.

[0020] In the embodiment of the present application, the conductive part passes through the through hole along the axial direction of the double-motor power assembly, and the plurality of mounting holes surround the through hole along the circumferential direction of the double-motor power assembly, which is conducive to the stable installation of the conductive part on the surface of the middle plate.

[0021] In the embodiment of the present application, the plurality of mounting holes arranged along the radial direction of the double-motor power assembly are arranged between the through hole and the circumferential wall of the bearing groove, so that the installation and fixation of the conductive part does not occupy the space outside the radial direction of the double-motor power assembly, so that the installation and fixation position of the conductive part is closer to the through hole, which is conducive to the stability of the fixation structure of the conductive part and the middle partition plate, thereby facilitating the stable electrical connection between the conductive part and the two motor shafts, so that the bearing can conduct current to the middle partition plate through the motor shaft and the conductive part, thereby reducing the electrical corrosion of the bearing. It is also conducive to providing sufficient space for the arrangement of other components of the middle partition plate except the bearing accommodated in the bearing groove. It is also conducive to reducing the fixation range of the conductive part along the radial direction of the double-motor power assembly, and facilitating the lightweight of the conductive part and the middle partition plate.

[0022] In an embodiment, along the radial direction of the double-motor power assembly, the distance between each mounting hole and a through hole is equal, and the distance between each mounting hole and a through hole is less than the hole diameter of a through hole.

[0023] In the embodiment of the present application, along the radial direction of the double-motor power assembly, the distance between each mounting hole and a through hole is equal, so that the arrangement of the plurality of mounting holes on the middle partition plate is regular, and it is also conducive to the uniform stress of the plurality of mounting holes for fixing the conductive part along the circumferential direction of the double-motor power assembly, and it is also conducive to the more stable fixation of the conductive part to the middle partition plate.

[0024] In the embodiment of the present application, along the radial direction of the double-motor power assembly, the distance between each mounting hole and a through hole is less than the hole diameter of a through hole, and the distance between each mounting hole and a through hole is smaller, which is conducive to arranging the plurality of mounting holes along the radial direction of the double-motor power assembly between the through hole and the circumferential wall of the bearing groove, so that the installation and fixation of the conductive part does not occupy the space outside the radial direction of the double-motor power assembly, so that the installation and fixation position of the conductive part is closer to the through hole, which is conducive to the stability of the fixation structure of the conductive part and the middle partition plate, thereby facilitating the stable electrical connection between the conductive part and the two motor shafts, so that the bearing can conduct current to the middle partition plate through the motor shaft and the conductive part, thereby reducing the electrical corrosion of the bearing. It is also conducive to providing sufficient space for the arrangement of other components of the middle partition plate except the bearing accommodated in the bearing groove. It is also conducive to reducing the fixation range of the conductive part along the radial direction of the double-motor power assembly, and facilitating the lightweight of the conductive part and the middle partition plate. The hole diameter of the through hole is larger, which is conducive to the smooth penetration of the conductive part through the through hole and the fixation of the conductive part to the middle partition plate and the electrical connection with the two motor shafts, so that the assembly process of the conductive part is simplified.

[0025] In an embodiment, the plurality of mounting holes are formed in the groove bottom of the groove. The structure for fixing the conductive part accommodated in the groove can be fixedly connected with the mounting hole, thereby realizing the fixed connection between the conductive part and the partition plate.

[0026] In an embodiment, the conductive member comprises a fixing protrusion protruding radially along the double-motor power assembly, the fixing protrusion protruding away from an axis of the conductive member, and the fixing protrusion is configured to be fixed to the middle plate. In this embodiment, the fixing protrusion has an outer diameter greater than a hole diameter of the through hole along the radial direction of the double-motor power assembly, and the fixing protrusion has an outer diameter less than a slot width of each bearing slot.

[0027] In an embodiment, the conductive member passes through the through hole along the axial direction of the double-motor power assembly, the conductive member is coaxial with the through hole along the axial direction of the double-motor power assembly, the conductive member comprises a fixing protrusion protruding radially along the double-motor power assembly, the fixing protrusion protruding away from an axis of the conductive member, so that the fixing protrusion of the conductive member can be fixed to the middle plate at a position around the through hole along the circumferential direction of the double-motor power assembly.

[0028] In an embodiment, the fixing protrusion has an outer diameter greater than a hole diameter of the through hole along the radial direction of the double-motor power assembly, so that the fixing protrusion can be fixed to the middle plate around the through hole, and the assembly difficulty is reduced.

[0029] In an embodiment, the fixing protrusion has an outer diameter greater than a hole diameter of the through hole along the radial direction of the double-motor power assembly, and the fixing protrusion has an outer diameter less than a slot width of each bearing slot, so that the conductive member is fixed between the slot peripheral wall of each bearing slot and the through hole along the radial direction of the double-motor power assembly, the fixing of the conductive member does not occupy space outside each bearing slot along the radial direction of the double-motor power assembly, the fixing position of the conductive member is closer to the through hole, which is conducive to the stability of the fixing structure of the conductive member and the middle plate, and thus conducive to the stability of the electrical connection between the conductive member and the two motor shafts, so that the bearing can conduct the generated current to the middle plate through the motor shaft and the conductive member, thereby reducing the electric corrosion of the bearing. In addition, the fixing of the conductive member provides more space for the arrangement of other components on the middle plate except the bearings accommodated in each bearing slot. The outer diameter of the fixing protrusion is small, which is conducive to reducing the volume of the conductive member along the radial direction of the double-motor power assembly and the lightweight of the conductive member, thereby facilitating the lightweight of the double-motor power assembly. In addition, the outer diameter of the fixing protrusion is less than the slot width of each bearing slot, so that each bearing provides space for the fixing protrusion to be fixed to the middle plate, avoiding interference between the fixing protrusion and the bearing.

[0030] In an embodiment, the conductive member comprises two sections, each section comprising a first sub-section and a second sub-section, the first sub-section of one section being configured to fix the first sub-section of the other section, and the second sub-section of each section being configured to electrically connect a motor shaft. In this embodiment, the second sub-section of each section is configured to pass through a through hole, and the first sub-section of each section is configured to be fixed to a middle plate. Along the radial direction of the double-motor power assembly, the outer diameter of the second sub-section of each section is less than the outer diameter of the first sub-section of each section, the outer diameter of the second sub-section of each section is less than the hole diameter of the through hole, and the outer diameter of the first sub-section of each section is greater than the hole diameter of the through hole.

[0031] In the embodiments of the present application, the first sub-section in one section is used to fix the first sub-section in another section, so that the two sections of the conductive member can be fixedly connected as a whole, and the structure of the conductive member is simplified. The second sub-section in each section is used to electrically connect one motor shaft, so that the second sub-section in each section can receive the current generated by the bearing transmitted from one motor shaft, the bearing is connected, the electric corrosion of the bearing is reduced, the service life of the bearing is prolonged, and the normal operation of the two motors can be ensured.

[0032] In the embodiments of the present application, the second sub-section in one section is used to pass through the through hole, so that the two sections of the conductive member can respectively extend into the two accommodating cavities of the housing of the double-motor power assembly, and the second sub-section in each section of the conductive member can be electrically connected with the motor shaft, the connection of the two motor shafts is realized by one conductive member, the parts are few, and the assembly is simple. The first sub-section in one section is used to fix the first sub-section in another section, and the first sub-section in one section is also used to be fixed to the partition plate, so that the two sections of the conductive member can be fixed to the partition plate.

[0033] In the embodiments of the present application, along the radial direction of the double-motor power assembly, the outer diameter of the second sub-section in one section is smaller than the outer diameter of the first sub-section in one section, and the outer diameter of the second sub-section in one section is smaller than the hole diameter of the through hole, so that the second sub-section in one section can pass through the through hole of the partition plate. The outer diameter of the first sub-section in one section is greater than the hole diameter of the through hole, so that the first sub-section in one section cannot pass through the through hole of the partition plate, the first sub-section in one section can be fixed to the partition plate, and the conductive member can be fixed to the partition plate. The outer diameter of the second sub-section in one section is smaller than the hole diameter of the through hole, and the outer diameter of the first sub-section in one section is greater than the hole diameter of the through hole, so that the conductive member not only can pass through the through hole and be fixed to the partition plate, but also can be limited by the first sub-section and the second sub-section in one section to be arranged at the position of the through hole, which is beneficial to the stable installation and fixation of the conductive member.

[0034] In one embodiment, along the axial direction of the double-motor power assembly, the length of one conductive member is greater than or equal to the interval of the two motor shafts.

[0035] In the embodiments of the present application, along the axial direction of the double-motor power assembly, the length of the conductive member is greater than or equal to the interval of the two motor shafts, so that the two conductive ends of the conductive member can be in an electrically connected state with the two motor shafts, the conductive effect of the conductive member with the two motor shafts is better, so that the conductive member can receive the current generated by the bearing transmitted from the two motor shafts, the electric corrosion of the bearing is reduced, the surface of the bearing is kept smooth, the wear of the bearing is reduced, the service life of the bearing is prolonged, and the working effect of the two motors is ensured.

[0036] In an embodiment, the conductive member includes an elastic member and two contacts, two ends of the elastic member are fixed to or abut against one end of the two contacts along the axial direction of the dual-motor power assembly, and the other end of the two contacts is two conductive ends.

[0037] In the embodiment, two ends of the elastic member are fixed to or abut against one end of the two contacts along the axial direction of the dual-motor power assembly, so that the elastic member exerts an elastic force on the two contacts along the axial direction of the dual-motor power assembly, the other end of the two contacts is two conductive ends, the two conductive ends are electrically connected to the motor shafts, the elastic member exerts an elastic force on the two contacts along the axial direction of the dual-motor power assembly, and the two contacts are pressed to contact the motor shafts, so that the electrical connection between the two contacts and the two motor shafts is more stable, and the conductive member is beneficial to long-time contact and conduction of the two motor shafts.

[0038] In the embodiment, the length of the two contacts and the free length of the elastic member are greater than the distance between the two motor shafts along the axial direction of the dual-motor power assembly, so that the elastic member of the conductive member exerts an elastic force on the two contacts along the axial direction of the dual-motor power assembly, and the two contacts are pressed to contact the motor shafts, so that even if the two contacts are worn and shortened during long-time use, the electrical connection with the two motor shafts can be maintained, the conductive life of the conductive member is prolonged, and the electrical corrosion of the bearing is reduced.

[0039] In an embodiment, each motor shaft includes an end face, the end face faces the middle partition plate along the axial direction of the dual-motor power assembly, and the end face is used to contact a conductive end of a conductive member, and the outer diameter of the end face is greater than the outer diameter of the conductive end of the conductive member in contact with the end face along the radial direction of the dual-motor power assembly.

[0040] In the embodiment, the end face faces the middle partition plate along the axial direction of the dual-motor power assembly, and the end face is used to contact the conductive end of the conductive member, so that the current conducted by the bearing to the motor shaft can be conducted to the conductive end of the conductive member through the end face, and then conducted to the middle partition plate through the conductive member, thereby realizing the shell connection of the bearing, which is beneficial to reducing the electrical corrosion of the bearing, prolonging the service life of the bearing, and ensuring the normal operation of the motor.

[0041] In the embodiments of the present application, along the radial direction of the double-motor power assembly, the outer diameter of the end face is greater than the outer diameter of the conductive end of the conductive member in contact with the end face, so that the conductive end of the conductive member can have a larger contact area with the end face of the motor shaft, so that the conductive member can more concentratedly receive current from the motor shaft and conduct to the middle partition plate. The outer diameter of the end face is greater than the outer diameter of the conductive end of the conductive member in contact with the end face, which can also improve the fault tolerance of the contact between the conductive member and the end face of the motor shaft. Even if the conductive member and the motor shaft are deflected at different shafts or small angles during the operation of the motor, the conductive member can still ensure electrical connection with the end face of the motor shaft.

[0042] In an embodiment, the inner ring of each bearing is used to fix to one input shaft. Each input shaft includes an input shaft cavity, the input shaft cavity penetrates the input shaft along the axial direction of the double-motor power assembly, the input shaft cavity is used to accommodate a motor shaft, and a conductive end of a conductive member is used to penetrate the input shaft cavity and electrically connect with the motor shaft accommodated in the input shaft cavity. Along the radial direction of the double-motor power assembly, the inner diameter of the input shaft cavity is greater than the outer diameter of the conductive end of the conductive member accommodated therein.

[0043] In the embodiments of the present application, each input shaft includes an input shaft cavity, the input shaft cavity penetrates the input shaft along the axial direction of the double-motor power assembly, the input shaft cavity is used to accommodate a motor shaft, and the arrangement of the motor shaft along the axial direction of the double-motor power assembly borrows part of the space of the input shaft cavity, so that the arrangement of the motor shaft does not excessively occupy the space of the double-motor power assembly in the axial direction, which is beneficial to reducing the axial dimension of the double-motor power assembly, and further beneficial to the miniaturization of the double-motor power assembly. A conductive end of a conductive member is used to penetrate the input shaft cavity and electrically connect with the motor shaft accommodated in the input shaft cavity, and the conductive end of the conductive member is directly arranged in the input shaft cavity and electrically connected with the motor shaft in the input shaft cavity. The arrangement of the conductive member in the double-motor power assembly utilizes part of the space of the input shaft cavity, so that the conductive member does not excessively occupy the space of the double-motor power assembly in the axial direction, which is beneficial to reducing the axial dimension of the double-motor power assembly, and further beneficial to the miniaturization of the double-motor power assembly.

[0044] In the embodiments of the present application, along the radial direction of the double-motor power assembly, the inner diameter of the input shaft cavity is greater than the outer diameter of the conductive end of the conductive member accommodated therein, so that the conductive end of the conductive member can smoothly penetrate the input shaft cavity and electrically connect with the motor shaft in the input shaft cavity.

[0045] In an embodiment, each speed reducer comprises an input wheel, two intermediate wheels and an intermediate shaft, the input wheel is fixed to an input shaft, the two intermediate wheels are fixed to the intermediate shaft, the input wheel is used to engage one of the intermediate wheels, and the outer diameter of one of the intermediate wheels is greater than that of the other intermediate wheel. In the axial direction of the dual-motor power assembly, the one intermediate wheel, the other intermediate wheel and a partition plate are arranged in sequence. In the axial direction of the dual-motor power assembly, the distance between the input wheel and the through hole is greater than the length of the other intermediate wheel, and the distance between the motor shaft accommodated in the shaft cavity of the input shaft and the through hole is greater than the distance between the input wheel and the through hole.

[0046] In the embodiment, the input wheel is fixed to the input shaft, the two intermediate wheels are fixed to the intermediate shaft, the input wheel is used to engage one of the intermediate wheels, the input wheel receives kinetic energy from the motor shaft through the input shaft, the input wheel transmits the kinetic energy to one of the intermediate wheels, drives the one intermediate wheel and the intermediate shaft to rotate, the intermediate shaft drives the other intermediate wheel to rotate, and the other intermediate wheel transmits the kinetic energy to the output wheel of the speed reducer, thereby driving the wheels.

[0047] In the embodiment, the outer diameter of one of the intermediate wheels is greater than that of the other intermediate wheel, and in the axial direction of the dual-motor power assembly, the one intermediate wheel, the other intermediate wheel and the partition plate are arranged in sequence, so that the space of the part of the input shaft between the one intermediate wheel and the partition plate can be used to accommodate the conductive end of the conductive member, thereby making the installation and arrangement of the conductive member not need additional space in the axial direction of the dual-motor power assembly, and facilitating the reduction of the size of the dual-motor power assembly in the axial direction.

[0048] In the embodiment, in the axial direction of the dual-motor power assembly, the distance between the input wheel and the through hole is greater than the length of the other intermediate wheel, so that the one intermediate wheel, the other intermediate wheel and the partition plate can be arranged in sequence in the axial direction of the dual-motor power assembly. The distance between the input wheel and the through hole is greater than the length of the other intermediate wheel, and the distance between the motor shaft accommodated in the shaft cavity of the input shaft and the through hole is greater than the distance between the input wheel and the through hole, so that part of the motor shaft can be accommodated in the shaft cavity of the input shaft, and the space between the motor shaft accommodated in the shaft cavity of the input shaft and the through hole can be used to accommodate the conductive end of the conductive member, thereby facilitating the electrical connection between the conductive end and the motor shaft. It is also beneficial to make the motor shaft, the input shaft and the conductive member occupy less space in the axial direction of the dual-motor power assembly, thereby facilitating the reduction of the axial size of the dual-motor power assembly and the miniaturization of the dual-motor power assembly.

[0049] In an embodiment, the inner ring of each bearing is configured to be fixed to a motor shaft. Each motor shaft includes a receiving groove, and a conductive end of the conductive member is configured to penetrate into the receiving groove and contact a bottom of the receiving groove. In the axial direction of the dual-motor power assembly, a groove width of the receiving groove is greater than an outer diameter of the conductive end of the conductive member received in the receiving groove.

[0050] In the embodiment, each motor shaft includes a receiving groove, and a conductive end of the conductive member is configured to penetrate into the receiving groove and contact a bottom of the receiving groove. In the axial direction of the dual-motor power assembly, a groove width of the receiving groove is greater than an outer diameter of the conductive end of the conductive member received in the receiving groove.

[0051] In the embodiment, each motor shaft includes a receiving groove, and a conductive end of the conductive member is configured to penetrate into the receiving groove and contact a bottom of the receiving groove. In the axial direction of the dual-motor power assembly, a groove width of the receiving groove is greater than an outer diameter of the conductive end of the conductive member received in the receiving groove.

[0052] In an embodiment, the bottom of the receiving groove is an end surface of the motor shaft, and the conductive end of the conductive member is configured to contact the end surface.

[0053] In a second aspect, the application provides an electric vehicle, which includes a vehicle frame, a power battery, and the dual-motor power assembly as described in the first aspect. The power battery is configured to supply power to the two motors of the dual-motor power assembly, and the two motors drive the wheels through the two reducers.

[0054] In the embodiment, the conductive member penetrates through the bottom of the bearing groove and the through hole of the partition plate, and the two conductive ends of the conductive member are configured to be electrically connected to the two motor shafts in the receiving cavities, so that the current of the bearings fixed to the motor shafts is conducted to the partition plate, the bearings are grounded, and the electrical corrosion of the bearings is reduced. In the embodiment, the conductive member is electrically connected to the two motor shafts by penetrating through the through hole, which has the advantages of fewer parts, simple assembly, fast installation, and simplified installation process of the dual-motor power assembly, and is conducive to the miniaturization of the dual-motor power assembly and the improvement of the overall performance of the electric vehicle. Attached Figure Description

[0055] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the embodiments of this application will be described below.

[0056] Figure 1 is a schematic diagram of the structure of the electric vehicle provided in an embodiment of this application;

[0057] Figure 2 is a schematic diagram of the dual-motor powertrain provided in an embodiment of this application;

[0058] Figure 3 is another structural schematic diagram of the dual-motor powertrain provided in an embodiment of this application;

[0059] Figure 4 is a structural schematic diagram of a dual-motor powertrain provided in another embodiment of this application;

[0060] Figure 5 is a partial cross-sectional view of the dual-motor powertrain provided in an embodiment of this application;

[0061] Figure 6 is a schematic diagram of the structure of the conductive element provided in an embodiment of this application;

[0062] Figure 7 is a partial enlarged view of the M1 part of the dual-motor powertrain in Figure 5;

[0063] Figure 8 is a partial cross-sectional view of a dual-motor powertrain provided in another embodiment of this application;

[0064] Figure 9 is a partial enlarged view of the M2 section of the dual-motor powertrain in Figure 5;

[0065] Figure 10 is a cross-sectional view of the conductive element provided in an embodiment of this application;

[0066] Figure 11 is a partial enlarged view of the M3 section of the dual-motor powertrain in Figure 5;

[0067] Figure 12 is another partial cross-sectional view of the dual-motor powertrain provided in an embodiment of this application;

[0068] Figure 13 is a partial cross-sectional view of a dual-motor powertrain provided in another embodiment of this application. Detailed Implementation

[0069] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0070] In order to realize quick installation of the electrically conductive part of the dual-motor power assembly and reduce the axial size of the dual-motor power assembly, the application provides a dual-motor power assembly. The housing of the dual-motor power assembly comprises a middle partition plate. The middle partition plate divides the housing into two accommodating cavities arranged in the axial direction of the dual-motor power assembly. Each accommodating cavity is used for accommodating an electric motor and a speed reducer. An electric motor shaft of each electric motor is used for driving connection with an input shaft of the speed reducer. The middle partition plate is used for fixing an electrically conductive part and two bearings. The electrically conductive part is used for electrically connecting the two electric motor shafts and the middle partition plate. The middle partition plate comprises two bearing grooves and a through hole. The two bearing grooves are arranged in opposite directions in the axial direction of the dual-motor power assembly. Each bearing groove is used for fixing a bearing. Each bearing is used for fixed connection or driving connection with an electric motor shaft through an input shaft. The through hole penetrates the groove bottom of the two bearing grooves in the axial direction of the dual-motor power assembly. The electrically conductive part penetrates the through hole in the axial direction of the dual-motor power assembly. The electrically conductive part comprises two electrically conductive ends arranged on the two sides of the middle partition plate in the axial direction of the dual-motor power assembly. Each electrically conductive end is used for electrically connecting an electric motor shaft. By arranging the through hole in the middle partition plate, the electrically conductive part can penetrate the groove bottom of the two bearing grooves and the through hole. Therefore, the two electrically conductive ends of the electrically conductive part are more convenient to electrically connect with the electric motor shafts in the two accommodating cavities. Thus, the electric current of the bearings fixed on the electric motor shafts is conducted to the middle partition plate, the bearings are insulated, and the electric corrosion of the bearings is reduced. In the embodiment of the application, the electrically conductive part is electrically connected with the two electric motor shafts through the through hole. Fewer parts are needed, and the assembly and installation are simple and quick.

[0071] The dual-motor power assembly provided by the embodiment of the application is used for an electric vehicle, and improves the overall performance of the electric vehicle.

[0072] FIG. 1 is a structural schematic diagram of an electric vehicle 1 provided by the embodiment of the application.

[0073] In an embodiment, the electric vehicle 1 comprises a dual-motor power assembly 10, a vehicle frame 20, a power battery 30 and a wheel 40. The vehicle frame 20 is used for fixing the dual-motor power assembly 10, the wheel 40 and the power battery 30. The dual-motor power assembly 10 is drivingly connected with the wheel 40. The power battery 30 provides electric energy for the dual-motor power assembly 10.

[0074] In the embodiment of the application, the electric vehicle 1 is a car. The dual-motor power assembly 10 can drive the wheel 40 to rotate.

[0075] FIG. 2 is a structural schematic diagram of the dual-motor power assembly 10 provided by the embodiment of the application.

[0076] In an embodiment, the dual-motor power assembly 10 comprises two electric motors 100, two speed reducers 200 and a power supply device 300.

[0077] In the embodiment of the present application, as shown in FIG. 1 and FIG. 2, the power battery 30 can supply power to the two motors 100 through the power supply device 300, and the two motors 100 are respectively connected with the wheels 40 through the two reducers 200 to provide power to the wheels 40 to drive the wheels 40 to move. In the embodiment of the present application, the dual-motor power assembly 10 is a distributed power assembly.

[0078] FIG. 3 is another structural schematic diagram of the dual-motor power assembly 10 provided by the embodiment of the present application, and FIG. 4 is a structural schematic diagram of the dual-motor power assembly 10 provided by another embodiment of the present application.

[0079] In one embodiment, the housing 400 of the dual-motor power assembly 10 includes a partition plate 410, as shown in FIG. 2 to FIG. 4, the partition plate 410 divides the housing 400 into two accommodating cavities 420 arranged along the axial direction O of the dual-motor power assembly 10, and each accommodating cavity 420 is used to accommodate one motor 100 and one reducer 200, and one motor shaft 110 of the motor 100 in each accommodating cavity 420 is used to drive connect with one input shaft 210 of the reducer 200.

[0080] In the embodiment of the present application, the kinetic energy of the motor 100 is transmitted to the input shaft 210 of the reducer 200 through the motor shaft 110, is reduced through the gear shaft system of the reducer 200, and then is transmitted to the wheel 40 to drive the wheel 40 to move.

[0081] Among them, the two motors 100 in the dual-motor power assembly 10 shown in FIG. 3 are arranged on the two sides of the two reducers 200, and the two motors 100 in the dual-motor power assembly 10 shown in FIG. 4 are arranged between the two reducers 200, and the two distribution modes of the dual-motor power assembly 10 are used to adapt to different use scenarios of the electric vehicle 1.

[0082] When the motor bearing in the motor works, it is affected by the common-mode voltage and the differential-mode voltage generated in the motor, an electric current is formed in the bearing, an electrochemical reaction is triggered, and bearing electrochemical corrosion phenomenon is generated. Bearing electrochemical corrosion refers to that under the action of the electric current, the ions on the surface of the bearing metal are dissolved and chemical reactions are generated on the electrode surface, thereby causing corrosion and damage to the surface of the bearing metal.

[0083] The dual-motor power assembly includes two motors, and the motor shaft of each motor needs to be connected with one grounding assembly to realize bearing grounding to avoid bearing electrochemical corrosion, but the two grounding assemblies make the dual-motor power assembly have many parts and the assembly is complicated. In the existing single-motor power assembly, the carbon brush is in contact with the motor cover plate, and the carbon brush seat is fixed to the motor shaft, which also makes the installation complicated.

[0084] The two conductive ends of the conductive member are used to realize the electrical connection between the conductive member and the two motor shafts, and the conductive member is positioned and installed through the through hole of the partition plate, so that the number of parts can be reduced and the installation process can be simplified.

[0085] The double-motor power assembly 10 provided by the embodiment of the application will be described in detail below.

[0086] FIG. 5 is a partial cross-sectional view of the double-motor power assembly 10 provided by the embodiment of the application, and FIG. 6 is a structural schematic view of the conductive member 500 provided by the embodiment of the application.

[0087] In one embodiment, one partition plate 410 is used to fix one conductive member 500 and two bearings 600, as shown in FIG. 5. The conductive member 500 is used to electrically connect the two motor shafts 110 and the partition plate 410. The partition plate 410 includes two bearing grooves 411 and 412 and one through hole 413. The two bearing grooves 411 and 412 are oppositely directed along the axial direction O of the double-motor power assembly. Each bearing groove 411 and 412 is used to fix one bearing 600, as shown in FIGS. 3 to 5. Each bearing 600 is used to fixedly connect or drivingly connect one motor shaft 110 through one input shaft 210. The through hole 413 penetrates the groove bottoms of the two bearing grooves 411 and 412 along the axial direction O of the double-motor power assembly. The conductive member 500 passes through the through hole 413 along the axial direction O of the double-motor power assembly, as shown in FIGS. 5 and 6. The conductive member 500 includes two conductive ends 510. The two conductive ends 510 are arranged on the two sides of the partition plate 410 along the axial direction O of the double-motor power assembly. Each conductive end 510 is used to electrically connect one motor shaft 110.

[0088] In the embodiment of the application, the two bearing grooves 411 and 412 are oppositely directed along the axial direction O of the double-motor power assembly. Each bearing groove 411 and 412 is used to fix one bearing 600. Each bearing 600 is used to fixedly connect or drivingly connect one motor shaft 110 through one input shaft 210. Specifically, each bearing groove 411 and 412 is used to fix the outer ring of one bearing 600. The inner ring of the bearing 600 is fixed to the motor shaft 110 or the input shaft 210. The two bearing grooves 411 and 412 are oppositely directed, which facilitates the driving connection of the two bearings 600 accommodated in the two bearing grooves 411 and 412 with the motor shaft 110 of one motor 100 or the input shaft 210 of one speed reducer 200 in the accommodating cavity of the two motors 100, so that the two motors 100 can be arranged on the two sides of the partition plate 410, and the two speed reducers 200 can be arranged on the two sides of the partition plate 410. This makes the structure arrangement regular and is also conducive to ensuring that the motors 100 and the speed reducers 200 in the two accommodating cavities 420 can work independently, so that the two motors 100 can be individually controlled to drive the operation of the single-side wheels 40, thereby realizing the independent control of the rotation speed and the torque of the single-side wheels 40.

[0089] In the embodiment of the present application, as shown in FIG. 5, the through hole 413 penetrates the bottom of the two bearing grooves 411, 412 along the double-motor power assembly axial O, so that the conductive part 500 can penetrate the bottom of the two bearing grooves 411, 412. The conductive part 500 passes through the through hole 413 along the double-motor power assembly axial O, so that the conductive part 500 can be electrically connected with the motor shaft 110 of the two motors 100 in the two accommodating cavities 420 respectively. The conductive part 500 includes two conductive ends 510 arranged on both sides of the partition plate 410 along the double-motor power assembly axial O, and each conductive end 510 is used for electrically connecting one motor shaft 110, so that one conductive part 500 can receive the current from the motor shaft 110 of the two motors 100 in the two accommodating cavities 420 and conduct the current to the partition plate 410, realizing the grounding of the two motor shafts 110, so that the current generated by the bearing fixed to the motor shaft 110 can be conducted to the partition plate 410 and the shell 400 through the motor shaft 110 and the conductive part 500, thereby reducing the electric corrosion of the bearing, keeping the surface of the bearing smooth, reducing the wear of the bearing, and protecting the working effect of the two motors 100. It should be noted that the bearings that can be electrically corroded include the bearing 600, and also include other bearings fixed to the motor shaft 110 or the input shaft 210.

[0090] In the embodiment of the present application, the through hole 413 of the partition plate 410 makes the conductive part 500 fixed to the partition plate 410 and passes through the two accommodating cavities 420, and the installation process of the conductive part 500 is simple, and only two conductive ends 510 of one conductive part 500 are used to electrically connect the motor shaft 110 of the two motors 100, so that the bearing fixed to the motor shaft 110 can conduct the current generated by the bearing to the partition plate 410 through the conductive part 500, the number of parts of the conductive part 500 is small, and the assembly of the conductive grounding structure is simple. The small number of parts of the conductive part 500 can also reduce the assembly cost of the production line and the management cost of the material code.

[0091] FIG. 7 is a partial enlarged view of the M1 part of the double-motor power assembly 10 in FIG. 5.

[0092] In one embodiment, as shown in FIGS. 5 and 7, the through hole 413 is coaxial with each bearing groove 411, 412, and the hole diameter of the through hole 413 is smaller than the inner diameter of each bearing 600.

[0093] In the embodiment of the present application, each bearing groove 411, 412 is used to fix one bearing 600, each bearing 600 is used to fix and connect or drive connect one motor shaft 110 through an input shaft 210, the through hole 413 is coaxial with each bearing groove 411, 412, so that each bearing 600 used to fix and connect the motor shaft 110 or the input shaft 210 can be coaxial with the through hole 413, and the conductive part 500 passes through the through hole 413 along the double-motor power assembly axial O, so that the conductive part 500 is coaxial with the two motor shafts 110 or the two input shafts 210, facilitating the two conductive ends 510 of the conductive part 500 to be electrically connected with the two motor shafts 110 respectively, so that the current generated by the bearing fixed on the motor shaft 110 can be conducted to the partition plate 410 through the motor shaft 110, the two conductive ends 510 of the conductive part 500, and the conductive part 500, thereby reducing the electric corrosion of the bearing, keeping the surface of the bearing smooth, reducing the wear of the bearing, and ensuring the working effect of the two motors 100.

[0094] In the embodiment of the present application, as shown in FIG. 7, the aperture of the through hole 413 is denoted as L1, and the inner diameter of each bearing 600 is denoted as L2, each bearing 600 is used to fix and connect or drive connect one motor shaft 110 through an input shaft 210, L1 < L2, so that the two conductive ends 510 of the conductive part 500 along the double-motor power assembly axial O can smoothly pass through the through hole 413 to be electrically connected with the motor shaft 110 respectively, so that the installation process of the conductive part 500 is simple, and the assembly difficulty can be reduced.

[0095] In one embodiment, along the double-motor power assembly axial O, as shown in FIG. 7, the depths of the two bearing grooves 411, 412 are the same, and the length of the through hole 413 is less than the depth of each bearing groove 411, 412.

[0096] In the embodiment of the present application, along the double-motor power assembly axial O, the depths of the two bearing grooves 411, 412 are the same, so that the structure of the partition plate 410 is regular, and it is also beneficial to the balance and stability of the housing 400 of the double-motor power assembly 10. The through hole 413 penetrates the groove bottoms of the two bearing grooves 411, 412 along the double-motor power assembly axial O, the depths of the two bearing grooves 411, 412 are the same, so that the distance between the through hole 413 and the two bearing groove openings along the double-motor power assembly axial O is equal, the partition plate 410 is a symmetrical structure, the distance between the two motor shafts 110 and the through hole 413 is the same, and it is beneficial to the balance of the two motors 100 after the conductive part 500 is installed and positioned.

[0097] In this embodiment, the length of the through hole 413 along the axial direction O of the dual-motor powertrain is denoted as L3, and the depth of each bearing groove 411, 412 is denoted as L4. L3 < L4, and a smaller L3 indicates that the thickness of the partition plate 410 along the axial direction O of the dual-motor powertrain is smaller. This facilitates the smoother passage of the conductive component 500 through the through hole 413 to be fixed to the partition plate 410 and electrically connected to the two motor shafts 110. L3 < L4 means that when the conductive component 500 passes through the through hole 413 to be fixed to the partition plate 410, it can utilize part of the space of the two bearing grooves 411, 412 along the axial direction O of the dual-motor powertrain to electrically connect to the two motor shafts 110. This helps to reduce the overall axial dimension of the dual-motor powertrain 10, which is beneficial for the miniaturization of the dual-motor powertrain 10 and facilitates its arrangement in the vehicle.

[0098] Figure 8 is a partial cross-sectional view of a dual-motor powertrain 10 provided in another embodiment of this application.

[0099] In one embodiment, the bottom 411a of a bearing groove 411 includes a recess 4111, as shown in FIG8, which is recessed away from the opening 411b of the bearing groove 411 along the axial direction O of the dual-motor powertrain. The width of the bearing groove 411 is greater than the width of the recess 4111 along the radial direction R of the dual-motor powertrain. A through hole 413 penetrates the bottom 4112 of the recess 4111 along the axial direction O of the dual-motor powertrain. The bottom 4112 of the recess 4111 is used to fix the conductive component 500. The distance between the opening 411b of the bearing groove 411 and the through hole 413 is greater than the distance between the opening 412a of the other bearing groove 412 and the through hole 413.

[0100] In this embodiment of the application, as shown in Figures 3 and 8, the bottom 411a of the bearing groove 411 includes a groove 4111. The conductive element 500 passes through the bottom 411a of the bearing groove 411, thereby also passing through the bottom 4112 of the groove 4111. The bottom 4112 of the groove 4111 is used to fix the conductive element 500. The exemplary groove 4111 is used to accommodate the structural component for fixing the conductive element 500. The spacing between the structural component for fixing the conductive element 500 and the two motor shafts 110 is the same, which helps to balance the connection between the two ends of the conductive element 500 and the two motors 100, making the overall structure of the dual-motor powertrain 10 more stable. Designing the conductive element 500 as a symmetrical structure along the axial direction O of the dual-motor powertrain also allows for balanced electrical connection between the conductive element 500 and the two motor shafts 110. Designing the conductive element 500 as a symmetrical structure makes its structure more regular and easier to process. In one embodiment, the structural component for fixing the conductive element 500 is a fixing protrusion 530 or a retaining ring of the conductive element 500.

[0101] In this embodiment, as shown in FIG8, along the radial direction R of the dual-motor powertrain, the width of the bearing groove 411 is denoted as L5, and the width of the recess 4111 is denoted as L6, where L5 > L6. This allows the conductive component 500 to be directly fixed within the bearing groove 411 when passing through the through hole 413 and the bottom 4112 of the recess 4111, without excessively occupying the space of the partition plate 410 along the radial direction R of the dual-motor powertrain. The portion of the partition plate 410 with the recess 4111 has a thinner thickness along the axial direction O of the dual-motor powertrain, which may weaken the structural strength of the partition plate 410. However, L5 > L6 also helps to keep the structural range of the portion of the partition plate 410 with the recess 4111 smaller, which helps to ensure the structural reliability of the partition plate 410.

[0102] In this embodiment of the application, as shown in FIG8, along the axial direction O of the dual-motor powertrain, the distance between the groove opening 411b of the bearing groove 411 and the through hole 413 is denoted as L7, and the distance between the groove opening 412a of the bearing groove 412 and the through hole 413 is denoted as L8. L7 > L8, so that the length of the conductive element 500 passing through the two sides of the groove bottom 4112 of the groove 4111 along the axial direction O of the dual-motor powertrain can be equal. This is beneficial to the balance of the connection structure between the conductive element 500 and the two motor shafts 110, thereby ensuring the balance and stability of the dual-motor powertrain 10.

[0103] In one embodiment, the partition 410 includes two surfaces 430, as shown in Figures 5 and 7, facing each other along the axial direction O of the dual-motor powertrain. One surface 430a includes a plurality of mounting holes 431, with the opening of each mounting hole 431 facing the groove 411b of the bearing groove 411 along the axial direction O of the dual-motor powertrain. The plurality of mounting holes 431 are used to fix the conductive component 500. The plurality of mounting holes 431 surround the through hole 413 along the circumferential direction C of the dual-motor powertrain. The plurality of mounting holes 431 are arranged between the through hole 413 and the peripheral wall of the bearing groove 411 along the radial direction R of the dual-motor powertrain.

[0104] In this embodiment, a surface 430a includes a plurality of mounting holes 431, with the opening of each mounting hole 431 facing the slot 411b of the bearing groove 411 along the axial direction of the dual-motor powertrain. This allows the conductive component 500 to be mounted and fixed to the surface 430a of the partition plate 410 through the plurality of mounting holes 431, thus simplifying the assembly process of the conductive component 500.

[0105] In this embodiment, the conductive element 500 passes through the through hole 413 along the axial direction O of the dual-motor powertrain, and multiple mounting holes 431 surround the through hole 413 along the circumferential direction C of the dual-motor powertrain, which makes the installation and fixation of the conductive element 500 on the surface 430a of the partition plate 410 more stable.

[0106] In this embodiment, multiple mounting holes 431 are arranged along the radial direction R of the dual-motor powertrain between the through hole 413 and the peripheral wall of the bearing groove 411. This ensures that the installation and fixing of the conductive component 500 does not occupy space outside the bearing groove 411 along the radial direction R of the dual-motor powertrain, and brings the installation and fixing position of the conductive component 500 closer to the through hole 413. This is beneficial to the stability of the fixing structure between the conductive component 500 and the partition plate 410, thereby facilitating the stable electrical connection between the conductive component 500 and the two motor shafts 110. This allows the bearing to conduct current to the partition plate 410 through the motor shaft 110 and the conductive component 500, thus reducing bearing electro-corrosion. It also provides sufficient space for the installation of other components in the partition plate 410 besides the bearing 600 accommodated in the bearing groove 411. Furthermore, it helps to reduce the fixing range of the conductive component 500 along the radial direction R of the dual-motor powertrain, contributing to the weight reduction of the conductive component 500 and the partition plate 410.

[0107] Figure 9 is a partial enlarged view of the M2 part of the dual-motor powertrain 10 in Figure 5.

[0108] In one embodiment, along the radial direction R of the dual-motor powertrain, as shown in Figures 5 and 7, the spacing between each mounting hole 431 and the through hole 413 is equal, and the spacing between each mounting hole 431 and the through hole 413 is less than the diameter of the through hole 413.

[0109] In this embodiment, along the radial direction R of the dual-motor powertrain, the spacing between each mounting hole 431 and the through hole 413 is equal, which makes the arrangement of multiple mounting holes 431 on the partition plate 410 regular. It also helps the multiple mounting holes 431 to fix the conductive component 500 to be subjected to uniform force along the circumferential direction C of the dual-motor powertrain, which helps the conductive component 500 to be more firmly fixed to the partition plate 410.

[0110] In this embodiment, referring to Figures 7 and 9, the distance between each mounting hole 431 and the through hole 413 along the radial direction R of the dual-motor powertrain is denoted as L9, and the diameter of the through hole 413 is L1. Since L9 < L1, a smaller L9 facilitates the arrangement of multiple mounting holes 431 along the radial direction R of the dual-motor powertrain between the through hole 413 and the peripheral wall of the bearing groove 411. This ensures that the installation and fixing of the conductive component 500 does not occupy space outside the bearing groove 411 along the radial direction R of the dual-motor powertrain, and brings the installation and fixing position of the conductive component 500 closer to the through hole 413. This improves the stability of the fixing structure between the conductive component 500 and the partition plate 410, thereby facilitating a stable electrical connection between the conductive component 500 and the two motor shafts 110. This allows the bearing to conduct current to the partition plate 410 through the motor shaft 110 and the conductive component 500, reducing bearing electro-corrosion. It also provides sufficient space for the partition plate 410 to accommodate other components besides the bearing housed in the bearing groove 411. It also helps to reduce the fixing range of the conductive component 500 along the radial R of the dual-motor powertrain, which is beneficial to the weight reduction of the conductive component 500 and the partition plate 410. The larger L1 facilitates the smooth fixing of the conductive component 500 to the partition plate 410 through the through hole 413 and its electrical connection with the two motor shafts 110, thus simplifying the assembly process of the conductive component 500.

[0111] In one embodiment, a plurality of mounting holes 431 are formed at the bottom 4112 of the groove 4111, so that the structural component for fixing the conductive component 500 accommodated in the groove 4111 can be fixedly connected with the mounting holes 431, thereby realizing the fixed connection between the conductive component 500 and the partition plate 410.

[0112] In one embodiment, the conductive element 500 includes a fixed protrusion 530, as shown in Figures 6 and 7. Along the radial direction R of the dual-motor powertrain, the fixed protrusion 530 protrudes away from the axis of the conductive element 500 and is used to fix it to the partition plate 410. Along the radial direction R of the dual-motor powertrain, the outer diameter of the fixed protrusion 530 is larger than the diameter of the through hole 413, smaller than the groove width of each bearing groove 411, 412, and smaller than the inner diameter of each bearing 600.

[0113] In this embodiment, the conductive element 500 passes through the through hole 413 along the axial direction O of the dual-motor powertrain. The conductive element 500 and the through hole 413 are coaxial along the axial direction O of the dual-motor powertrain. The conductive element 500 includes a fixing protrusion 530 along the radial direction R of the dual-motor powertrain. The fixing protrusion 530 protrudes away from the axis of the conductive element 500, so that the fixing protrusion 530 of the conductive element 500 can be installed and fixed with the partition plate 410 around the through hole 413 along the circumferential direction C of the dual-motor powertrain.

[0114] In this embodiment of the application, as shown in FIG7, along the radial direction R of the dual motor powertrain, the outer diameter of the fixed protrusion 530 is denoted as L10, and the diameter of the through hole 413 is L1, where L10 > L1, so that the fixed protrusion 530 can be installed and fixed with the partition plate 410 around the through hole 413, reducing the assembly difficulty.

[0115] In this embodiment of the application, as shown in FIG7, the outer diameter of the fixed protrusion 530 along the radial direction R of the dual-motor power assembly is L10, the groove width of each bearing groove 411, 412 is denoted as L11, and the inner diameter of each bearing 600 is denoted as L2, where L10 < L11 and L10 < L2. This allows the conductive component 500 to be fixed along the radial direction R of the dual-motor power assembly between the groove peripheral wall of each bearing groove 411, 412 and the through hole 413. This ensures that the installation and fixing of the conductive component 500 does not occupy the space outside the radial direction R of each bearing groove 411, 412 of the dual-motor power assembly, and makes the installation and fixing position of the conductive component 500 closer to the through hole 413. This is beneficial to the stability of the fixing structure between the conductive component 500 and the middle partition plate 410, thereby facilitating the stable electrical connection between the conductive component 500 and the two motor shafts 110. This allows the bearing to conduct the generated current to the middle partition plate 410 through the motor shaft 110 and the conductive component 500, thereby reducing bearing electro-corrosion. This also allows for more space on the partition 410 for other components besides the bearings 600 housed in each bearing slot 411, 412. A smaller L10 also helps reduce the radial volume R of the conductive element 500 along the dual-motor powertrain, contributing to the weight reduction of the conductive element 500 and thus the overall weight reduction of the dual-motor powertrain 10. Furthermore, L10 < L2 provides space for the mounting protrusion 530 on the partition 410, preventing interference between the mounting protrusion 530 and the bearing 600.

[0116] In one embodiment, exemplary as shown in FIG7, the fixing protrusion 530 is fixed to the partition plate 410 by bolts 501, clips, welding or adhesive bonding.

[0117] In one embodiment, the fixing protrusion 530 includes a plurality of fixing holes 531, as shown in Figures 6 and 7. The plurality of fixing holes 531 penetrate the fixing protrusion 530 along the axial direction of the dual motor powertrain. The fixing holes 531 cooperate with the mounting holes 431 to fix the fixing protrusion 530 and the partition plate 410 to each other.

[0118] In this embodiment, the multiple fixing holes 531 of the fixing protrusion 530 and the multiple mounting holes 431 of the partition plate 410 cooperate with each other along the axial direction O of the dual-motor powertrain, so that the conductive element 500 is installed and fixed firmly in the partition plate 410. This is conducive to the stable electrical connection between the conductive element 500 and the two motor shafts 110, and allows the bearing to conduct the generated current to the partition plate 410 through the motor shaft 110 and the conductive element 500, thereby reducing bearing electro-corrosion.

[0119] In one embodiment, the conductive element 500 includes two segments 540, as shown in Figures 5 and 6. Each segment 540 includes a first sub-segment 541 and a second sub-segment 542. The first sub-segment 541a in segment 540a is used to fix the first sub-segment 541b in segment 540b, and the second sub-segment 542 in each segment 540 is used to electrically connect a motor shaft 110. The second sub-segment 542a in segment 540a passes through a through-hole 413, and the first sub-segment 541a in segment 540a is also used to fix to the partition plate 410. As shown in Figures 6 and 9, along the radial direction R of the dual-motor powertrain, the outer diameter of the second sub-segment 542a in segment 540a is smaller than the outer diameter of the first sub-segment 541a in segment 540a, the outer diameter of the second sub-segment 542a in segment 540a is smaller than the diameter of the through-hole 413, and the outer diameter of the first sub-segment 541a in segment 540a is larger than the diameter of the through-hole 413.

[0120] In this embodiment, a first sub-segment 541a of segment 540a is used to fix a first sub-segment 541b of segment 540b, thereby allowing the two segments 540a and 540b of the conductive component 500 to be fixedly connected as a whole, simplifying the structure of the conductive component 500. A second sub-segment 542 of each segment 540 is used to electrically connect to a motor shaft 110, allowing the second sub-segment 542 of each segment 540 to receive the current generated by the bearing transmitted from a motor shaft 110, achieving bearing housing, thereby reducing bearing electro-corrosion, extending bearing service life, and ensuring the normal operation of the two motors 100.

[0121] In this embodiment, a second sub-segment 542a of a section 540a passes through a through hole 413, allowing both sections 540 of the conductive member 500 to extend into the two receiving cavities 420 of the housing 400 of the dual-motor powertrain 10. This enables the second sub-segment 542 of each section 540 of the conductive member 500 to be electrically connected to the motor shaft 110. A single conductive member 500 connects the two motor shafts 110, resulting in fewer parts and simpler assembly. A first sub-segment 541a of a section 540a is used to fix the first sub-segment 541b of another section 540b. The first sub-segment 541a of a section 540a is also used to fix to the partition plate 410, allowing both sections 540 of the conductive member 500 to be fixed to the partition plate 410.

[0122] In this embodiment of the application, as shown in FIG9, along the radial direction R of the dual-motor powertrain, the outer diameter of the second sub-segment 542a in a segment 540a is denoted as L12, the outer diameter of the first sub-segment 541a in a segment 540a is denoted as L13, the diameter of the through hole 413 is L1, L12 < L13, L12 < L1, so that the second sub-segment 542a in a segment 540a can pass through the through hole 413 of the partition plate 410, L13 > L1, so that the first sub-segment 541a in a segment 540a cannot pass through the through hole 413 of the partition plate 410, so that the first sub-segment 541a in a segment 540a can be fixed to the partition plate 410, so that the conductive element 500 can be fixed to the partition plate 410. L12 < L1, L13 > L1, which allows the conductive component 500 to not only pass through the through hole 413 and be fixed to the middle partition 410, but also to restrict the position of the conductive component 500 passing through the through hole 413 by the first sub-segment 541a and the second sub-segment 542a in a section 540a, which is beneficial to the stable installation and fixation of the conductive component 500.

[0123] In one embodiment, as shown in FIG5, the length of the conductive element 500 along the axial direction of the dual-motor powertrain is greater than or equal to the distance between the two motor shafts 110.

[0124] In this embodiment, the length of the conductive element 500 along the axial direction of the dual-motor powertrain is greater than or equal to the distance between the two motor shafts 110, so that the two conductive ends 510 of the conductive element 500 can maintain an electrical connection with the two motor shafts 110, thereby improving the conductivity between the conductive element 500 and the two motor shafts 110. This allows the conductive element 500 to receive the current generated by the bearings conducted from the two motor shafts 110, reducing the electro-corrosion of the bearings, maintaining the smoothness of the bearing surface, reducing wear on the bearings, extending the service life of the bearings, and ensuring the working effect of the two motors 100.

[0125] Figure 10 is a cross-sectional view of the conductive element 500 provided in an embodiment of this application.

[0126] In one embodiment, the conductive element 500 includes an elastic element 550 and two contacts 560, as shown in FIG10. Along the axial direction O of the dual-motor powertrain 10, both ends 550a of the elastic element 550 are fixed or abutted against one end 560a of each of the two contacts 560, and the other ends 560b of the two contacts 560 are two conductive ends 510. As shown in FIGS. 5 and 10, along the axial direction O of the dual-motor powertrain 10, the sum of the lengths of the two contacts 560 and the free length of the elastic element 550 is greater than the distance between the two motor shafts 110.

[0127] In this embodiment, the two ends 550a of the elastic element 550 along the axial direction O of the dual-motor powertrain are fixed or abutted against one end 560a of the two contacts 560, so that the elastic element 550 has an elastic force on the two contacts 560 along the axial direction O of the dual-motor powertrain. The other ends 560b of the two contacts 560 are two conductive ends 510, which are electrically connected to the motor shaft 110. The elastic element 550 applies an elastic force along the axial direction O of the dual-motor powertrain to the two contacts 560, squeezing the two contacts 560 to make them contact the motor shaft 110, so that the electrical connection between the two contacts 560 and the two motor shafts 110 is more stable, which is beneficial to the long-term contact and conduction of the conductive element 500 with the two motor shafts 110.

[0128] In this embodiment, along the axial direction O of the dual-motor powertrain 10, the sum of the lengths of the two contacts 560 and the free length of the elastic element 550 is greater than the distance between the two motor shafts 110. This allows the elastic element 550 of the conductive element 500 to apply an elastic force along the axial direction O of the dual-motor powertrain to the two contacts 560, pressing the two contacts 560 into contact with the motor shafts 110. This ensures that even if the two contacts 560 wear and shorten during long-term use, they can still maintain electrical connection with the two motor shafts 110, extending the conductive life of the conductive element 500 and reducing the risk of bearing corrosion.

[0129] In one embodiment, two contacts 560 are fixed to one end of two motor shafts 110 and respectively abut against the two conductive ends 510 of the conductive element 500, thereby realizing the electrical connection between the motor shaft 110 and the conductive element 500. This allows the bearing fixed on the motor shaft 110 to conduct the generated current to the conductive element 500 through the motor shaft 110 and the two contacts 560, and then to the partition plate 410, thus realizing the bearing housing.

[0130] In one embodiment, the two contacts 560 are carbon brushes, and exemplaryly, the cross-sectional shape of the carbon brushes may be square, circular, or conical. In another embodiment, the two contacts 560 are conductive pads. In yet another embodiment, the two contacts 560 are conductive spherical components.

[0131] In one embodiment, the conductive element 500 includes a conductive housing 570, as shown in FIG10. The conductive housing 570 is used to accommodate the elastic element 550 and one end 560a of the two contacts 560, while the other end 560b of the two contacts 560 is exposed outside the conductive housing 570.

[0132] In one embodiment, the conductive housing 570 includes two conductive sub-housings 571, which are fixed along the axial direction O of the dual-motor powertrain. Each conductive sub-housing 571 is used to accommodate a portion of the elastic element 550 and one end 560a of each contact 560, while the other end 560b of each contact 560 is exposed outside each conductive sub-housing 571.

[0133] In one embodiment, the elastic element 550 includes two sub-elastic elements 551, as shown in FIG10. The two sub-elastic elements 551 abut against or are fixed to each other along the axial direction O of the dual-motor powertrain. Each conductive sub-housing 571 is used to accommodate one sub-elastic element 551 and one end 560a of each contact 560, and the other end 560b of each contact 560 is exposed outside the conductive sub-housing 571.

[0134] Figure 11 is a partial enlarged view of the M3 section of the dual-motor powertrain 10 in Figure 5.

[0135] In one embodiment, each motor shaft 110 includes an end face 111, as shown in Figures 5 and 11, which faces the partition plate 410 along the axial direction of the dual-motor powertrain. The end face 111 is used to contact the conductive end 510 of the conductive element 500. The outer diameter of the end face 111 along the radial direction of the dual-motor powertrain is larger than the outer diameter of the conductive end 510 of the conductive element 500 that it contacts.

[0136] In this embodiment, the end face 111 along the axial direction of the dual-motor powertrain faces the partition plate 410. The end face 111 is used to contact the conductive end 510 of the conductive element 500, so that the current transmitted from the bearing to the motor shaft 110 can be transmitted through the end face 111 to the conductive end 510 of the conductive element 500, and then through the conductive element 500 to the partition plate 410, thus realizing the bearing housing. This helps to reduce the electrical corrosion of the bearing, extend the service life of the bearing, and ensure the normal operation of the motor.

[0137] In this embodiment, the outer diameter of the radial R end face 111 of the dual-motor powertrain is denoted as L14, and the outer diameter of the conductive end 510 of the conductive element 500 in contact with the end face 111 is denoted as L15. L14 > L15, which allows the conductive end 510 of the conductive element 500 to have a larger contact area with the end face 111 of the motor shaft 110, enabling the conductive element 500 to receive current from the motor shaft 110 more concentratedly and conduct it to the partition plate 410. L14 > L15 also improves the fault tolerance rate of the contact between the conductive element 500 and the end face 111 of the motor shaft 110. Even if the conductive element 500 and the motor shaft 110 deflect at different axes or small angles during the operation of the motor 100, it can still ensure that the conductive element 500 can be electrically connected to the end face 111 of the motor shaft 110.

[0138] Figure 12 is another partial cross-sectional view of the dual-motor powertrain 10 provided in an embodiment of this application.

[0139] In one embodiment, as shown in FIG12, the inner ring of each bearing 600 is used to fix an input shaft 210. Each input shaft 210 includes an input shaft cavity 211 extending through the input shaft 211 along the axial direction O of the dual-motor powertrain. The input shaft cavity 211 accommodates a motor shaft 110. A conductive end 510 of the conductive element 500 is inserted into the input shaft cavity 211 and electrically connected to the motor shaft 110 accommodated within the input shaft cavity 211. Along the radial direction R of the dual-motor powertrain, the inner diameter of the input shaft cavity 211 is larger than the outer diameter of the conductive end 510 of the conductive element 500 it accommodates.

[0140] In this embodiment of the application, the inner ring of each bearing 600 is fixed to an input shaft 210, such that each bearing 600 is connected to a motor shaft 110 via an input shaft 210.

[0141] In this embodiment of the application, each input shaft 210 includes an input shaft cavity 211. The input shaft cavity 211 extends through the input shaft 210 along the axial direction O of the dual-motor powertrain. The input shaft cavity 211 is used to accommodate the motor shaft 110. The arrangement of the motor shaft 110 along the axial direction O of the dual-motor powertrain utilizes part of the space of the input shaft cavity 211, so that the arrangement of the motor shaft 110 does not occupy too much space of the dual-motor powertrain 10 along the axial direction O. This is beneficial to reducing the axial dimension of the dual-motor powertrain 10, and thus to miniaturizing the dual-motor powertrain 10. The conductive end 510 of the conductive element 500 is used to pass through the input shaft cavity 211 and to be electrically connected to the motor shaft 110 housed in the input shaft cavity 211. The conductive end 510 of the conductive element 500 is directly arranged in the input shaft cavity 211 and electrically connected to the motor shaft 110 in the input shaft cavity 211. This arrangement of the conductive element 500 in the dual-motor powertrain 10 utilizes part of the space in the input shaft cavity 211, so that the conductive element 500 does not occupy too much space in the axial direction O of the dual-motor powertrain 10. This is beneficial to reducing the axial dimension of the dual-motor powertrain 10, and thus to miniaturizing the dual-motor powertrain 10.

[0142] In this embodiment, along the radial direction R of the dual-motor powertrain, the inner diameter of the input shaft cavity 211 is denoted as L16, and the outer diameter of the conductive end 510 of the conductive element 500 contained in the input shaft cavity 211 is L15. L16 > L15, so that the conductive end 510 of the conductive element 500 can smoothly pass into the input shaft cavity 211 and achieve electrical connection with the motor shaft 110 inside the input shaft cavity 211.

[0143] In one embodiment, each reducer 200 includes an input wheel 220, two intermediate wheels 230 and 240, and an intermediate shaft 250, as shown in Figures 3 and 12. The input wheel 220 is fixed to the input shaft 210, and the two intermediate wheels 230 and 240 are fixed to the intermediate shaft 250. The input wheel 220 is used to mesh with one intermediate wheel 230, and the outer diameter of the intermediate wheel 230 is larger than the outer diameter of the other intermediate wheel 240. Along the axial direction O of the dual-motor powertrain, the intermediate wheels 230, 240, and the partition plate 410 are arranged sequentially. Along the axial direction O of the dual-motor powertrain, the distance between the input wheel 220 and the through hole 413 is greater than the length of the intermediate wheel 240, and the distance between the motor shaft 110 accommodated in the input shaft cavity 211 and the through hole 413 is greater than the distance between the input wheel 220 and the through hole 413.

[0144] In this embodiment, the input wheel 220 is fixed to the input shaft 210, and the two intermediate wheels 230 and 240 are fixed to the intermediate shaft 250. The input wheel 220 is used to mesh with the intermediate wheel 230. The input wheel 220 receives kinetic energy from the motor shaft 110 through the input shaft 210. The input wheel 220 transmits the kinetic energy to the intermediate wheel 230, driving the intermediate wheel 230 and the intermediate shaft 250 to rotate. The rotation of the intermediate shaft 250 drives the intermediate wheel 240 to rotate, and then transmits the kinetic energy to the output wheel 260 of the reducer 200 through the intermediate wheel 240, thereby driving the wheel 40.

[0145] In this embodiment, the outer diameter of the intermediate wheel 230 is larger than that of the intermediate wheel 240. Along the axial direction O of the dual-motor powertrain, the intermediate wheel 230, the intermediate wheel 240, and the partition plate 410 are arranged in sequence, so that the space of part of the input shaft 210 between the intermediate wheel 230 and the partition plate 410 can be used to accommodate the conductive end 510 of the conductive component 500. This means that the installation arrangement of the conductive component 500 does not require additional space in the axial direction O of the dual-motor powertrain, which is beneficial to reducing the size of the axial direction O of the dual-motor powertrain and to miniaturizing the dual-motor powertrain 10.

[0146] In this embodiment, along the axial direction O of the dual-motor powertrain, the distance between the input wheel 220 and the through hole 413 is denoted as L17, the length of the intermediate wheel 240 is denoted as L18, and the distance between the motor shaft 110 accommodated in the input shaft cavity 211 and the through hole 413 is denoted as L19. L17 > L18, thus allowing the intermediate wheel 230, intermediate wheel 240, and partition plate 410 to be arranged sequentially along the axial direction O of the dual-motor powertrain. L17 > L18, L19 > L17, allowing a portion of the motor shaft 110 to be accommodated within the input shaft cavity 211, and also allowing the space between the motor shaft 110 accommodated in the input shaft cavity 211 and the through hole 413 to be used to accommodate the conductive end 510 of the conductive component 500, which is beneficial for the electrical connection between the conductive end 510 and the motor shaft 110. It also helps to reduce the space occupied by the motor shaft 110, input shaft 210 and conductive component 500 in the axial direction O of the dual-motor powertrain, thereby helping to reduce the axial dimension of the dual-motor powertrain 10 and to miniaturize the dual-motor powertrain 10.

[0147] Figure 13 is a partial cross-sectional view of a dual-motor powertrain 10 provided in another embodiment of this application.

[0148] In one embodiment, as shown in Figures 4, 6 and 13, along the axial direction of the dual-motor powertrain, two motors 100 are arranged between two reducers 200, and the two conductive ends 510 of the conductive element 500 are in direct contact with the two motor shafts 110 of the two motors 100 to achieve electrical connection.

[0149] In one embodiment, the inner ring of each bearing 600 is used to fix a motor shaft 110. As shown in FIG13, each motor shaft 110 includes a receiving groove 112, with the groove opening 112a facing the partition plate 410 along the dual-motor powertrain axis. The conductive end 510 of the conductive element 500 is used to pass through the receiving groove 112 and to contact the bottom 112b of the receiving groove 112. Along the radial direction R of the dual-motor powertrain, the groove width of the receiving groove 112 is greater than the outer diameter of the conductive end 510 of the conductive element 500 it receives.

[0150] In this embodiment, the inner ring of each bearing 600 is used to fix a motor shaft 110, and the conductive end 510 of the conductive element 500 is directly electrically connected to the motor shaft 110.

[0151] In this embodiment, each motor shaft 110 includes a receiving groove 112. The opening 112a of the receiving groove 112 faces the partition plate 410 along the axial direction of the dual-motor powertrain, so that the conductive element 500 passing through the through hole 413 of the partition plate 410 can be inserted into the receiving groove 112. The conductive end 510 of the conductive element 500 is used to insert into the receiving groove 112, so that the conductive element 500 can be arranged using the space of the receiving groove 112 in the motor shaft 110, thereby reducing the axial dimension of the dual-motor powertrain 10. The conductive end 510 of the conductive element 500 is used to contact the bottom 112b of the receiving groove 112, so that the conductive end 510 is electrically connected to the motor shaft 110. This allows the conductive end 510 of the conductive element 500 to receive the current from the motor shaft 110, thereby conducting the current generated by the bearing to the middle partition 410 through the motor shaft 110 and the conductive element 500, realizing the bearing housing, thereby reducing the electrical corrosion of the bearing and extending the service life of the bearing.

[0152] In this embodiment, along the radial direction R of the dual-motor powertrain, the width of the receiving groove 112 is denoted as L20, and the outer diameter of the conductive end 510 of the conductive element 500 contained in the receiving groove 112 is denoted as L21. L20 > L21, so that the conductive end 510 of the conductive element 500 can pass into the receiving groove 112, and the conductive end 510 of the conductive element 500 can be electrically connected to the bottom 112b of the receiving groove 112, thereby enabling the conductive element 500 to be electrically connected to the motor shaft 110. This allows the conductive end 510 of the conductive element 500 to receive current from the motor shaft 110, realizing the bearing housing, thereby reducing bearing electro-corrosion and extending the bearing's service life.

[0153] In one embodiment, the bottom 112b of the receiving groove 112 is the end face 111 of the motor shaft 110.

[0154] The dual-motor powertrain and electric vehicle provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and embodiments of this application. The description of the embodiments above is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in specific embodiments and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A dual-motor powertrain, characterized by, The housing of the double-motor power assembly comprises a middle partition plate, the middle partition plate separates the housing into two accommodating cavities arranged axially along the double-motor power assembly, each of the accommodating cavities is used for accommodating an electric motor and a speed reducer, an electric motor shaft of each of the electric motors is used for drivingly connecting an input shaft of each of the speed reducers, the middle partition plate is used for fixing a conductive member and two bearings, the conductive member is used for electrically connecting the two electric motor shafts and the middle partition plate, the middle partition plate comprises: two bearing grooves, the two bearing grooves are oppositely arranged axially along the double-motor power assembly, each of the bearing grooves is used for fixing one of the bearings, and each of the bearings is used for fixedly connecting or drivingly connecting one of the electric motor shafts through one of the input shafts; a through hole, the through hole penetrates the bottom of the two bearing grooves axially along the double-motor power assembly, the conductive member penetrates the through hole axially along the double-motor power assembly, and the conductive member comprises two conductive ends arranged on two sides of the middle partition plate axially along the double-motor power assembly, and each of the conductive ends is used for electrically connecting one of the electric motor shafts.

2. The dual-motor powertrain of claim 1, wherein, The through hole is coaxial with each of the bearing grooves, and the diameter of the through hole is smaller than the inner diameter of each of the bearings.

3. The dual-motor powertrain of claim 1 or 2, wherein, Along the double-motor power assembly, the depths of the two bearing grooves are the same, and the length of the through hole is smaller than the depth of each of the bearing grooves.

4. The dual-motor powertrain of any one of claims 1-3, wherein, The bottom of one of the bearing grooves comprises a recess, the recess is recessed away from the opening of the one of the bearing grooves along the double-motor power assembly, and wherein: Along the double-motor power assembly, the width of the one of the bearing grooves is greater than the width of the recess; Along the double-motor power assembly, the through hole penetrates the bottom of the recess, the bottom of the recess is used for fixing the conductive member, and the distance between the opening of the one of the bearing grooves and the through hole is greater than the distance between the opening of the other of the bearing grooves and the through hole.

5. The dual-motor powertrain of any one of claims 1-4, wherein, The middle partition plate comprises two surfaces opposite to each other along the double-motor power assembly, one of the surfaces comprises a plurality of mounting holes, the opening of each of the mounting holes is directed to the opening of one of the bearing grooves along the double-motor power assembly, and the plurality of mounting holes are used for fixing the conductive member, and wherein: Along the double-motor power assembly, the plurality of mounting holes surround the through hole; Along the double-motor power assembly, the plurality of mounting holes are arranged between the through hole and the circumferential wall of the one of the bearing grooves along the radial direction.

6. The dual electric motor powertrain of claim 5, wherein, Along the double-motor power assembly, the distance between each of the mounting holes and the through hole is equal, and the distance between each of the mounting holes and the through hole is smaller than the diameter of the through hole.

7. The dual electric motor powertrain of any one of claims 1-6, wherein, The conductive member comprises a fixing protrusion, the fixing protrusion is protruded away from the axis of the conductive member along the radial direction of the double-motor power assembly, and the fixing protrusion is used for being fixed to the middle partition plate, and wherein: The outer diameter of the one fixed protrusion is greater than the hole diameter of the one through hole along the radial direction of the double-motor power assembly, and the outer diameter of the one fixed protrusion is less than the slot width of each bearing groove.

8. The dual electric motor powertrain of any one of claims 1-7, wherein, The one conductive member includes two sections, each section includes a first sub-section and a second sub-section, the first sub-section in one section is used for fixing the first sub-section in the other section, and the second sub-section in each section is used for electrically connecting one motor shaft, wherein: The second sub-section in the one section is used for penetrating the one through hole, and the first sub-section in the one section is also used for being fixed to the one partition plate. The outer diameter of the second sub-section in the one section is less than the outer diameter of the first sub-section in the one section along the radial direction of the double-motor power assembly, the outer diameter of the second sub-section in the one section is less than the hole diameter of the one through hole, and the outer diameter of the first sub-section in the one section is greater than the hole diameter of the one through hole.

9. The dual electric motor powertrain of any one of claims 1-8, wherein, The length of the one conductive member along the axial direction of the double-motor power assembly is greater than or equal to the interval of the two motor shafts.

10. The dual electric motor powertrain of any one of claims 1-9, wherein, The one conductive member includes an elastic member and two contacts, the two ends of the elastic member along the axial direction of the double-motor power assembly are respectively fixed to or abut against one end of the two contacts, and the other end of the two contacts is the two conductive ends, wherein: The sum of the length of the two contacts and the free length of the one elastic member along the axial direction of the double-motor power assembly is greater than the interval of the two motor shafts.

11. The dual electric motor powertrain of any one of claims 1-10, wherein, Each motor shaft includes an end face, the one end face along the axial direction of the double-motor power assembly faces the one partition plate, the one end face is used for contacting one conductive end of the one conductive member, and the outer diameter of the one end face along the radial direction of the double-motor power assembly is greater than the outer diameter of the one conductive end of the one conductive member in contact with the one end face.

12. The dual electric motor powertrain of any one of claims 1-11, wherein, The inner ring of each bearing is used for being fixed to one input shaft, wherein: Each input shaft includes an input shaft cavity, the input shaft cavity penetrates the input shaft along the axial direction of the double-motor power assembly, the input shaft cavity is used for accommodating one motor shaft, and one conductive end of the one conductive member is used for penetrating the input shaft cavity and electrically connecting the one motor shaft accommodated in the input shaft cavity. The inner diameter of the one input shaft cavity along the radial direction of the double-motor power assembly is greater than the outer diameter of the one conductive end of the one conductive member accommodated therein.

13. The dual electric motor powertrain of claim 12, wherein, Each reducer includes an input wheel, two intermediate wheels and an intermediate shaft, the one input wheel is fixed to one input shaft, the two intermediate wheels are fixed to the one intermediate shaft, the one input wheel is used for engaging one intermediate wheel, and the outer diameter of the one intermediate wheel is greater than the outer diameter of the other intermediate wheel, wherein: The one intermediate wheel, the other intermediate wheel and the one partition plate are arranged in sequence along the axial direction of the double-motor power assembly. Along the axial direction of the dual-motor power assembly, the distance between the one input wheel and the one through hole is greater than the length of the one intermediate wheel, and the distance between the one motor shaft accommodated in the one input shaft cavity and the one through hole is greater than the distance between the one input wheel and the one through hole.

14. The dual electric motor powertrain of any one of claims 1-11, wherein, The inner ring of each bearing is used for fixing the one motor shaft, wherein: Each motor shaft comprises an accommodation slot, and along the axial direction of the dual-motor power assembly, the slot opening of the one accommodation slot faces the one partition plate, and the one conductive end of the one conductive member is used for penetrating into the one accommodation slot and used for contacting the slot bottom of the one accommodation slot. Along the radial direction of the dual-motor power assembly, the slot width of the one accommodation slot is greater than the outer diameter of the one conductive end of the one conductive member accommodated therein.

15. An electric vehicle, characterized by The electric vehicle comprises a vehicle frame, a power battery and the dual-motor power assembly according to any one of claims 1-14, the power battery is used for supplying power to the two motors of the dual-motor power assembly, and the two motors drive the wheels through the two reducers.

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