Power assembly, mounting device thereof and electric vehicle

Abstract

The utility model provides a power assembly, a mounting device thereof and an electric vehicle, a shell of the power assembly is used for accommodating rotors and stators of two driving motors, the shell comprises a middle partition plate, the middle partition plate comprises two bearing grooves and two grooves, and groove openings of the two bearing grooves are opposite in the axial direction of the driving motors; each bearing groove is used for being rotationally connected with a motor shaft of a driving motor. Wherein the two grooves are distributed in the groove bottoms of the two bearing grooves respectively, groove openings of the grooves are opposite in the axial direction of the driving motor, the groove bottom of each groove comprises an oil outlet hole, and the oil outlet holes of the two grooves are used for conveying oil conveyed by an internal flow channel of the middle partition plate to motor shafts rotationally connected with the two bearing grooves respectively. According to the scheme, the ejector pin can be installed in the groove used for forming the oil outlet hole in the power assembly assembling process, the rotor is prevented from being attracted to be deviated by the magnetic force effect of the stator in the rotor installing process, and the assembling device and the assembling process are simplified.

Description

TECHNICAL FIELD

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

[0002] The power assembly comprises a driving motor, the driving motor comprises a stator, a rotor and a motor shaft, the rotor is sleeved on the motor shaft, and the driving motor is installed by first installing the stator into a housing of the power assembly and then assembling the motor shaft with the rotor. However, since the rotor contains a magnetic steel, the stator core of the stator will generate a magnetic force on the rotor during the assembly of the rotor, the motor shaft and the stator, which causes the rotor to be attracted and deviated, and the stator and rotor wall are damaged. At present, the workpiece column for positioning the rotor and the motor shaft is inserted through the housing of the power assembly, the two ends of the workpiece column are fixed, and the motor shaft with the rotor is rotated into the housing of the power assembly along the outer periphery of the workpiece column. However, for a double-motor power assembly, the installation is more complex. CONTENT OF THE UTILITY MODEL

[0003] The present application provides a power assembly, an installation device thereof and an electric vehicle, so that the rotor of the driving motor is not attracted and deviated by the magnetic force of the stator during the installation of the power assembly, and the assembly device and process are simplified.

[0004] In a first aspect, the present application provides a power assembly, a housing of the power assembly is used for accommodating the rotors and stators of two driving motors, the housing comprises a middle partition plate, the middle partition plate comprises two bearing grooves and two recesses, the grooves of the two bearing grooves are opposite along the axial direction of the driving motor, and each bearing groove is used for rotationally connecting a motor shaft of one driving motor. Wherein, the two recesses are respectively distributed on the groove bottoms of the two bearing grooves, the grooves of each recess are opposite along the axial direction of the driving motor, and the groove bottom of each recess comprises an oil outlet hole, and the oil outlet holes of the two recesses are used for respectively conveying oil liquid transmitted by an internal flow channel of the middle partition plate to the motor shafts rotationally connected by the two bearing grooves.

[0005] In the mounting process of the driving motor in the power assembly, the stator of the driving motor is first mounted into the housing of the power assembly through interference fit, and then the motor shaft on which the rotor is fixed is assembled into the housing. However, in the process of assembling the rotor into the housing, the rotor is difficult to be positioned and guided, and since the rotor contains magnetic steel, the rotor will generate an attractive force to the stator core of the stator, causing the rotor to be attracted and deviated, thereby damaging the walls of the stator and the rotor. Therefore, the rotor needs to be positioned and guided during assembly to avoid the rotor from being attracted and deviated. The two grooves are respectively arranged at the groove bottoms of the two bearing grooves, and the groove openings of each groove are opposite along the axial direction of the driving motor, so that in the process of assembling the rotor of the driving motor into the housing of the power assembly, the thimble can be inserted into the groove, so that the rotor and the motor shaft of the driving motor can be inserted and mounted into the housing along the thimble, so that the rotor will not be attracted and deviated, and the reliability of the rotor assembly is ensured.

[0006] In the embodiment of the present application, the groove bottom of each groove comprises an oil outlet hole, and the oil outlet holes of the two grooves are used to respectively deliver the oil liquid transmitted by the internal flow channel of the partition plate to the motor shafts rotatably connected by the two bearing grooves, so that the oil liquid transmitted by the internal flow channel of the partition plate can be simultaneously input into the motor shafts of the two driving motors, realizing parallel flow of the oil liquid, and further enabling the oil liquid in the internal flow channel of the partition plate to simultaneously supply the rotors of the two driving motors and the two planetary reducers for cooling and lubrication, which is beneficial to improving the cooling and lubrication efficiency of the power assembly, and can also simplify the arrangement of the oil channel in the housing. In the embodiment of the present application, the groove of the partition plate used to form the oil outlet hole is used as a support structure for supporting the thimble to prevent the rotor from being attracted and deviated by the magnetic force of the stator during mounting, which simplifies the structure and the assembly device.

[0007] In the embodiment of the present application, each bearing groove is used to accommodate a bearing of a motor shaft, the inner wall of each bearing groove is used to fix the outer ring of the bearing of the motor shaft, and each motor shaft is used to fix the inner ring of the bearing of the motor shaft. In the process of mounting the motor shaft and the rotor along the thimble, in one embodiment, the bearing can be pre-assembled on one end of the motor shaft, and the assembly is completed when the bearing moves to the bearing groove and is fixed. In one embodiment, the bearing can be pre-assembled in the bearing groove, and the assembly is completed when one end of the motor shaft is inserted into the bearing and fixed.

[0008] In the embodiment of the present application, two recesses are arranged by using two bearing grooves on the middle partition plate of the shell, and the slots of the two recesses are opposite along the axial direction of the driving motor, so that the ejector pin can be inserted into the recess from the direction of the slot of the two recesses respectively, and then the motor shaft and the rotor are sleeved on the ejector pin, and the installation is performed by sliding on the outer periphery of the ejector pin, which can prevent the rotor from being attracted and deviated by the magnetic force of the stator during the installation of the rotor, and the recess formed by the oil outlet hole of the middle partition plate can be directly used as a support structure for supporting the ejector pin, thereby simplifying the assembly device. The oil outlet holes at the bottom of each recess can output the oil in the internal flow channel of the middle partition plate to the space of the motor shaft originally used for passing through the ejector pin during the operation of the power assembly, so as to realize the parallel flow of the oil, and the cooling and lubricating efficiency of the power assembly is improved.

[0009] In an embodiment, the two recesses are integrally cast with the middle partition plate of the shell of the power assembly, which is beneficial to make the recess and the shell have strong rigidity, and more conveniently use the recess to support the ejector pin to install the motor shaft and the rotor.

[0010] In an embodiment, the recess is coaxial with the bearing groove where the recess is located.

[0011] In the embodiment of the present application, the recess is coaxial with the bearing groove where the recess is located, and the motor shaft connected with the bearing groove is coaxial with the bearing groove, so that the recess can be coaxial with the motor shaft, thereby avoiding the deviation of the ejector pin from the axis of the motor shaft when the ejector pin is inserted into the recess, avoiding the deviation of the motor shaft and the rotor during the combined installation of the motor shaft and the rotor along the ejector pin, and avoiding the wear between the rotor and the stator, so that the installation process is more reliable.

[0012] In an embodiment, the recess can be a circular groove or a square groove, as long as the center of the recess is coaxial with the bearing groove where the recess is located.

[0013] In an embodiment, the diameter of the oil outlet hole along the radial direction of the driving motor is smaller than the width of the slot of the recess.

[0014] In the embodiment of the present application, the diameter of the oil outlet hole along the radial direction of the driving motor is smaller than the width of the slot of the recess, which can avoid the ejector pin from penetrating into the oil outlet hole from the bottom of the recess when the ejector pin is inserted into the recess, and more conveniently support and limit the ejector pin by the bottom of the recess, thereby improving the reliability of the rotor assembly.

[0015] In the embodiment of the present application, if the diameter of the oil outlet hole is equal to the width of the slot of the recess, the ejector pin will penetrate through the recess and the oil outlet hole, and the ejector pin cannot be limited by the recess along the axial direction of the driving motor, which is easy to make the rotor assembly process unreliable.

[0016] In an embodiment, the width of the bottom of the recess along the radial direction of the driving motor is smaller than the width of the slot of the recess.

[0017] In the embodiment of the present application, the width of the groove bottom of the radial groove of the driving motor is smaller than the width of the groove opening, the width of the groove opening is larger, which facilitates the penetration of the ejector pin into the groove opening to abut against the groove bottom, thereby achieving the limited installation of the ejector pin. The width of the groove bottom is smaller, which can avoid the penetration of the ejector pin through the groove bottom, thereby ensuring the stability of the installation process of the motor shaft and the rotor.

[0018] In an embodiment, the width of the groove bottom of the radial groove of the driving motor is equal to the width of the groove opening, and the hole diameter of the oil outlet hole is smaller than the width of the groove bottom. At this time, the ejector pin can be limited and abutted through the part of the groove bottom of the groove except the oil outlet hole, and the rotor assembly of the driving motor can be reliable.

[0019] In an embodiment, the hole diameter of the radial oil outlet hole of the driving motor is smaller than or equal to the width of the groove bottom. The oil in the internal flow channel of the partition plate is transported out of the groove through the oil outlet hole, and at the same time, the strength of the partition plate is reliable, which avoids the influence of the excessively large hole diameter of the oil outlet hole on the structural strength of the partition plate.

[0020] In an embodiment, the groove width of the radial groove of the driving motor gradually increases from the groove bottom to the groove opening.

[0021] In the embodiment of the present application, the groove width of the radial groove of the driving motor gradually increases from the groove bottom to the groove opening, so that the groove peripheral wall of the groove is in the shape of a truncated cone. The groove peripheral wall of the groove in the shape of a truncated cone can have a larger contact area with the ejector pin with a pointed bottom, which improves the stability after the insertion of the ejector pin, thereby facilitating the stability of the assembly of the rotor along the outer periphery of the ejector pin into the housing.

[0022] In the embodiment of the present application, the groove peripheral wall of the groove in the shape of a truncated cone also has a guiding effect on the ejector pin, which facilitates the smooth penetration of the ejector pin into the groove.

[0023] In an embodiment, the partition plate comprises a protrusion, the protrusion protrudes from the groove bottom of the bearing groove, and the groove is distributed on the end face of the protrusion away from the groove bottom of the bearing groove.

[0024] In the embodiment of the present application, the protrusion protrudes from the groove bottom of the bearing groove, and the groove is distributed on the end face of the protrusion away from the groove bottom of the bearing groove, so that the groove is closer to the assembly direction of the rotor of the driving motor, which facilitates the quick entry of the ejector pin into the groove, and also avoids the collision between the ejector pin and the groove bottom of the bearing groove, thereby affecting the structural strength of the partition plate, and the stability of the power assembly is higher.

[0025] In an embodiment, the length of the protrusion in the axial direction of the driving motor is greater than the groove depth of one bearing groove.

[0026] In the embodiment of the present application, the length of the protrusion along the axial direction of the driving motor is greater than the groove depth of one bearing groove, so that the groove distributed on the end surface of the protrusion is farther away from the groove bottom of the bearing groove, and the plunger can be quickly assembled with the groove on the end surface of the protrusion.

[0027] In the embodiment of the present application, the length of the protrusion along the axial direction of the driving motor is greater, the groove is located on the end surface of the protrusion, and the oil outlet hole is located on the groove bottom of the groove, so that the oil in the internal flow channel of the middle partition plate can be more conveniently input into the motor shaft through the internal flow channel of the protrusion by the oil outlet hole.

[0028] In one embodiment, the groove depth along the axial direction of the driving motor is less than the length of the protrusion.

[0029] In the embodiment of the present application, the groove depth along the axial direction of the driving motor is less than the length of the protrusion, the groove depth is smaller, the groove can be more conveniently machined without affecting the structural strength of the protrusion, the length of the protrusion is greater, the structural strength of the protrusion is stronger, and the groove is distributed closer to the assembly direction of the rotor of the driving motor, so that the plunger can be quickly entered into the groove. The groove depth along the axial direction of the driving motor is less than the length of the protrusion, which is conducive to keeping the plunger stable and reliable in the case of quick assembly with the groove.

[0030] In the embodiment of the present application, if the groove depth is greater than the length of the protrusion, the groove needs to be arranged by the thickness of the middle partition plate, which is easy to reduce the structural strength of the shell.

[0031] In one embodiment, the motor shaft comprises a shaft hole, the shaft hole penetrates the motor shaft along the axial direction of the driving motor, the protrusion protrudes towards the shaft hole, and the inner diameter of the shaft hole is greater than the inner diameter of the oil outlet hole.

[0032] In the embodiment of the present application, the motor shaft comprises a shaft hole, the shaft hole penetrates the motor shaft along the axial direction of the driving motor, so that the oil can flow in the shaft hole of the motor shaft, thereby cooling the rotor of the driving motor.

[0033] In the embodiment of the present application, the protrusion protrudes towards the shaft hole, so that the groove distributed on the end surface of the protrusion away from the groove bottom of the bearing groove and the oil outlet hole on the groove bottom can also be towards the shaft hole, thereby more conveniently and smoothly outputting the oil in the internal flow channel of the middle partition plate to the shaft cavity of the motor shaft through the internal flow channel of the protrusion by the oil outlet hole.

[0034] In the embodiment of the present application, the inner diameter of the shaft hole is greater than the inner diameter of the oil outlet hole, so that the shaft hole can accommodate the plunger, the oil outlet hole on the groove bottom cannot accommodate the plunger, thereby avoiding the plunger from being worn out of the oil outlet hole and unable to stably guide the assembly of the motor shaft and the rotor, and ensuring the reliability of the assembly.

[0035] In an embodiment, the shaft hole comprises a first section and a second section, the first section has a larger inner diameter than the second section, the protrusion is inserted into the first section, the part of the motor shaft where the second section is located is used to fix the rotor, the protrusion is spaced from the second section along the axial direction of the driving motor, and the notch of the groove faces the second section.

[0036] In the embodiment, the first section has a larger inner diameter than the second section, the protrusion is inserted into the first section, the larger inner diameter of the first section facilitates the insertion of the protrusion into the first section, and the protrusion is spaced from the first section along the radial direction of the driving motor, thereby avoiding wear between the first section and the protrusion during rotation of the motor shaft. The smaller inner diameter of the second section facilitates the gapless fit between the plunger and the shaft hole of the motor shaft, making the assembly process of the rotor and the motor shaft more stable and reliable, and also making the part of the motor shaft where the second section is located have a large structural strength, thereby making the fixing of the rotor more reliable.

[0037] In the embodiment, the protrusion is spaced from the second section along the axial direction of the driving motor, thereby avoiding wear between the second section of the motor shaft and the protrusion during rotation of the motor shaft.

[0038] In the embodiment, the notch of the groove faces the second section, thereby facilitating the oil outlet hole at the bottom of the groove to directly input into the second section of the shaft hole through the notch of the groove, and also facilitating the reduction of leakage of oil from the gap between the first section and the notch of the groove, so that more oil is transported through the motor shaft, and the oil can meet the lubrication requirements of the rotor of the driving motor and the planetary reducer.

[0039] In an embodiment, the outer side of the motor shaft comprises a limiting groove, the limiting groove is arranged on the outer side wall of the first section of the shaft hole, and the limiting groove is used to abut against the bearing of the motor shaft, so that the rotor and the motor shaft can be limited by the limiting groove and the bearing groove when assembled by the plunger, thereby making the assembly more accurate.

[0040] In an embodiment, the space between the protrusion and the first section is used to accommodate a conductive ring, and the conductive ring is used to electrically connect the protrusion and the first section.

[0041] In the embodiment, the space between the protrusion and the first section is used to accommodate a conductive ring, and the conductive ring is arranged in the space of the protrusion along the radial direction of the driving motor, which is advantageous in shortening the axial size of the power assembly compared to arranging the conductive ring on the outer wall of the motor shaft. The conductive ring is used to electrically connect the protrusion and the first section, so that the shaft current generated during rotation of the motor shaft can be conducted to the conductive ring through the first section, and then conducted to the protrusion on the partition plate through the conductive ring, thereby achieving grounding and avoiding electrical corrosion of the bearing of the motor shaft.

[0042] In an embodiment, the protrusion comprises a fixed section and a communicating section, the fixed section is closer to the second section than the communicating section, the outer diameter of the communicating section is larger than the outer diameter of the fixed section, the fixed section is used for fixing the conductive ring, and the end face of the communicating section towards the fixed section is used for abutting against the conductive ring.

[0043] In the embodiment of the present application, the outer diameter of the communicating section is larger than the outer diameter of the fixed section, which is more convenient for fixing the conductive ring in the fixed section from the direction of the slot opening of the bearing groove. The outer diameter of the communicating section is larger than the outer diameter of the fixed section, which also makes the end face of the communicating section towards the fixed section be able to abut against the conductive ring, avoiding the conductive ring rotating with the motor shaft in the first section.

[0044] In an embodiment, the shaft hole is used for accommodating an oil guide pipe, one end of the oil guide pipe is fixed to receive the oil liquid delivered by the oil outlet hole, and the other end of the oil guide pipe is used for extending into the planetary reducer to deliver the oil liquid to the planetary reducer.

[0045] In the embodiment of the present application, since the protrusion is located in the first section of the shaft hole, the oil delivery distance of the oil outlet hole in the protrusion is short. By arranging the oil guide pipe in the shaft hole of the motor shaft, using one end of the oil guide pipe to receive the oil liquid delivered by the oil outlet hole of the protrusion, and using the other end of the oil guide pipe to extend into the planetary reducer to deliver the oil liquid to the planetary reducer, the oil liquid in the shaft hole of the motor shaft can be prevented from being thrown out of the motor shaft during the rotation of the motor shaft, the oil liquid output by the oil outlet hole can be delivered for a longer distance, and the planetary reducer located at the other end of the oil guide pipe can be ensured to receive sufficient oil liquid for lubrication, thereby meeting the lubrication requirement of the gear shaft assembly of the planetary reducer.

[0046] In an embodiment, the oil guide pipe is rotationally connected to the motor shaft through a support bearing.

[0047] In an embodiment, the outer wall of the oil guide pipe and the outer wall of the motor shaft both comprise through holes, so that the oil liquid in the oil guide pipe can flow out of the through holes of the outer wall of the oil guide pipe and the through holes of the outer wall of the motor shaft to the rotor of the driving motor, cooling the rotor, which is conducive to ensuring the normal operation of the driving motor.

[0048] In a second aspect, the present application provides a mounting device of a power assembly, the mounting device is used for mounting the power assembly of the first aspect, the housing is used for fixing the stator, the motor shaft is used for fixing the rotor, and the mounting device comprises a thimble, one end of the thimble is used for being inserted into the groove to abut against the groove bottom or the groove peripheral wall, and the motor shaft fixed with the rotor is used for being sleeved on the outer periphery of the thimble and moving along the thimble to the bearing groove of the middle partition plate.

[0049] In the embodiment of the present application, one end of the thimble is used for being inserted into the groove to abut against the groove bottom or the groove peripheral wall, so that the thimble can be in full contact with the groove and be limited by the groove, which is conducive to making the assembly of the thimble more stable and reliable.

[0050] In the embodiment of the present application, the motor shaft fixed with the rotor is used to set the bearing groove on the outer periphery of the ejector pin and move along the ejector pin to the bearing groove of the middle partition plate, so that the installation of the motor shaft and the rotor can be installed along the outer periphery of the ejector pin, so that the rotor will not be affected by the magnetic force of the stator to be attracted and deviated, which is beneficial to improve the reliability of the rotor assembly.

[0051] In the embodiment of the present application, the groove for forming the oil outlet hole of the middle partition plate is used as a support structure for supporting the ejector pin to prevent the rotor from being attracted and deviated by the magnetic force of the stator during installation, which simplifies the structure and simplifies the assembly device.

[0052] In one embodiment, the installation device of the power assembly further includes a reducer housing pre-assembly device. The sun gear of the planetary reducer is formed on one end of the motor shaft of the driving motor, so that the motor shaft and the sun gear are integrated, so that during the assembly of the motor shaft and the rotor, part of the sun gear assembly of the planetary reducer also needs to be assembled to the motor shaft before being assembled into the housing. The reducer housing pre-assembly device can fix the planetary reducer during installation, and the reducer housing pre-assembly device can cooperate with the ejector pin to jointly install the motor shaft, the rotor and part of the sun gear assembly of the planetary reducer into the housing, and finally install the other sun gear assemblies of the planetary reducer and the reducer housing.

[0053] In a third aspect, the present application provides an electric vehicle, which includes a frame and a power assembly as in the first aspect, the frame is used to fix the power assembly, and the driving motor of the power assembly is used to drive the wheels.

[0054] In the embodiment of the present application, the two grooves are arranged on the two bearing grooves of the middle partition plate of the housing, and the two groove openings are opposite along the axial direction of the driving motor. The oil outlet holes are arranged on the groove bottoms of the two grooves, and the oil in the internal flow channel of the middle partition plate can be output to the motor shaft through the two oil outlet holes, realizing parallel flow of the oil, which is beneficial to improve the cooling and lubricating efficiency of the power assembly. The present application can also insert the ejector pin into the groove from the direction of the groove opening of the two grooves, and set the motor shaft and the rotor on the ejector pin and slide along the ejector pin to install into the housing. The groove for forming the oil outlet hole of the middle partition plate is used as a structure for supporting the ejector pin to prevent the rotor from being attracted and deviated by the magnetic force of the stator during installation, which simplifies the structure and simplifies the assembly device. BRIEF DESCRIPTION OF DRAWINGS

[0055] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will illustrate the drawings needed to be used in the embodiments of the present application.

[0056] Figure 1 is a schematic diagram of an electric vehicle provided by the embodiment of the present application;

[0057] Figure 2 is a schematic diagram of a power assembly provided by an embodiment of the present application;

[0058] Figure 3 is another schematic diagram of a power assembly provided by an embodiment of the present application;

[0059] Figure 4 is a schematic diagram of a mounting device and a power assembly provided by an embodiment of the present application;

[0060] Figure 5 is a schematic diagram of a housing of a power assembly provided by an embodiment of the present application;

[0061] Figure 6 is a partial enlarged view of M1 part of the power assembly in Figure 3

[0062] Figure 7 is a partial enlarged view of M2 part of the housing in Figure 5

[0063] Figure 8 is another schematic diagram of a housing of a power assembly provided by an embodiment of the present application;

[0064] Figure 9 is another schematic diagram of a housing of a power assembly provided by an embodiment of the present application. DETAILED DESCRIPTION

[0065] The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application.

[0066] The present application provides a power assembly, a housing of the power assembly is used for accommodating rotors and stators of two driving motors, the housing comprises a middle partition plate, the middle partition plate comprises two bearing grooves and two recesses, the slots of the two bearing grooves are opposite in the axial direction of the driving motor, and each bearing groove is used for rotationally connecting a motor shaft of one driving motor. Wherein, the two recesses are respectively distributed at the groove bottoms of the two bearing grooves, the slots of each recess are opposite in the axial direction of the driving motor, and the groove bottom of each recess comprises an oil outlet hole, and the oil outlet holes of the two recesses are used for respectively conveying oil liquid transmitted by an internal flow channel of the middle partition plate to the motor shafts rotationally connected by the two bearing grooves.

[0067] ​​By arranging two recesses through two bearing grooves on the middle partition plate of the shell, and making the grooves of the two recesses opposite in the axial direction of the driving motor, the bottom of each recess is provided with an oil outlet hole, and the oil in the internal flow channel of the middle partition plate can be output to the motor shaft through the two oil outlet holes, realizing parallel flow of the oil, which is beneficial to improve the cooling and lubrication efficiency of the power assembly. The present application can also insert a thimble into the recess from the direction of the groove of the two recesses, respectively, and install the motor shaft and the rotor on the thimble and slide along the thimble into the shell, directly use the recess of the middle partition plate for forming the oil outlet hole as the structure for supporting the thimble to prevent the rotor from being attracted and deviated by the magnetic force of the stator during installation, simplify the structure, and simplify the assembly device.

[0068] Figure 1 is a schematic diagram of an electric vehicle 1 provided by an embodiment of the present application.

[0069] In an embodiment, the electric vehicle 1 includes a vehicle frame 10 and a power assembly 20, as shown in Figure 1 The vehicle frame 10 is used to fix the power assembly 20. In the embodiment of the present application, the electric vehicle 1 refers to a wheeled device driven or pulled by a power device. In the embodiment of the present application, the power assembly 20 is used to drive the vehicle wheel 30.

[0070] Figure 2 is a schematic diagram of the power assembly 20 provided by an embodiment of the present application, Figure 3 is another schematic diagram of the power assembly 20 provided by an embodiment of the present application.

[0071] In an embodiment, as shown in Figure 2 and Figure 3 The power assembly 20 includes a power supply device 100, a driving motor 200 and a planetary reducer 300.

[0072] In the embodiment of the present application, the driving motor 200 includes a motor shaft 210, a stator 220 and a rotor 230, and the planetary reducer 300 includes a gear shaft assembly 310. The rotor 230 in the driving motor 200 is fixedly sleeved on the motor shaft 210, and the stator 220 drives the rotor 230 to rotate after receiving the alternating current transmitted by the power supply device 100, thereby driving the motor shaft 210 to rotate. The motor shaft 210 of the driving motor 200 is used to transmit kinetic energy to the gear shaft assembly 310 of the planetary reducer 300, and then transmit power to the vehicle wheel 30 through the output half shaft of the planetary reducer 300, thereby driving the vehicle wheel 30 to move.

[0073] In an embodiment, the power assembly 20 includes two driving motors 200 and two planetary reducers 300, as Figure 3As shown, along the axial direction O of the powertrain 20, two planetary reducers 300 are arranged on both sides of the two drive motors 200. The stator 220 of each drive motor 200 is used to receive current from the power battery 40 to rotate the rotor 230 of the drive motor 200, and transmits power to a planetary reducer 300 through the motor shaft 210, thereby driving the wheel 30 on one side of the electric vehicle 1 to move. The operation of the wheels 30 on both sides of the electric vehicle 1 is controlled by the two drive motors 200 and the two planetary reducers 300 respectively.

[0074] In one embodiment, the motor shaft 210 includes internal oil passages, such as... Figure 3 As shown, the internal oil passage of the motor shaft 210 is used to receive the oil delivered by the internal oil passage of the housing 20a of the powertrain 20. The oil in the internal oil passage of the motor shaft 210 is used to cool the rotor 230 of the drive motor 200 and lubricate the gear shaft assembly 310 of the planetary reducer 300, so that the planetary reducer 300 can operate normally.

[0075] The current installation of drive motors in powertrains mainly involves passing a positioning tooling column through the powertrain housing, fixing both ends of the tooling column, and then rotating the motor shaft with the fixed rotor into the powertrain housing along the tooling column. However, this makes the installation more complicated and inconvenient for dual-motor powertrains.

[0076] In this embodiment, two grooves are formed at the bottom of the bearing groove of the partition plate in the powertrain housing. These two grooves serve as support columns when the motor shaft and rotor are assembled, allowing the ejector pin to abut against the grooves. This allows the motor shaft with the rotor mounted on it to be assembled into the powertrain housing along the ejector pin without being sucked off.

[0077] Figure 4 This is a schematic diagram of the installation of the mounting device 2 and the powertrain 20 provided in an embodiment of this application. The arrows represent the direction of force application. Figure 4 The motor shaft 210 and rotor 230 are installed into the housing 20a from top to bottom.

[0078] The mounting device 2 for the powertrain 20 in the embodiments of this application will be described below.

[0079] In one embodiment, such as Figure 4As shown, the mounting device 2 of the power assembly 20 is used for mounting the power assembly 20, the housing 20a of the power assembly 20 is used for fixing the stator 220, the motor shaft 210 is used for fixing the rotor 230, the mounting device 2 includes a thimble 201, one end 201a of the thimble 201 is used for being inserted into the groove 410 of the middle partition plate 400 and abutting against the groove bottom 411 or the groove wall of the groove 410, and the motor shaft 210 fixed with the rotor 230 is used for being sleeved on the outer periphery of the thimble 201 and moving along the thimble 201 to the bearing groove 420 of the middle partition plate 400.

[0080] In the embodiment of the present application, one end 201a of the thimble 201 is used for being inserted into the groove 410 and abutting against the groove bottom 411 or the groove wall of the groove 410, so that the thimble 201 can be in sufficient contact with the groove 410 and be limited by the groove 410, which is beneficial to making the assembly of the thimble 201 more stable and reliable.

[0081] In the embodiment of the present application, the motor shaft 210 fixed with the rotor 230 is used for being sleeved on the outer periphery of the thimble 201 and moving along the thimble 201 to the bearing groove 420 of the middle partition plate 400, so that the installation of the motor shaft 210 and the rotor 230 can be installed along the outer periphery of the thimble 201, thereby the rotor 230 will not be affected by the magnetic force of the stator 220 to be attracted and deviated, which is beneficial to improving the reliability of the assembly of the rotor 230.

[0082] In the embodiment of the present application, the groove 410 of the middle partition plate 400 used for forming the oil outlet hole 4110 is used as a support structure for supporting the thimble 201 to prevent the rotor 230 from being attracted and deviated by the magnetic force of the stator 220 during the installation process, which simplifies the structure and simplifies the assembly device.

[0083] In one embodiment, as shown in Figure 3 and Figure 4 As shown, the mounting device 2 of the power assembly 20 further includes a reducer housing pre-assembly device 202. The gear shaft assembly 310 of the planetary reducer 300 includes a sun gear 311, in one embodiment, the sun gear 311 is formed at one end of the motor shaft 210 of the driving motor 200, so that the motor shaft 210 and the sun gear 311 are in an integrated structure, thereby during the assembly process of the motor shaft 210 and the rotor 230, the partial gear shaft assembly 310 of the planetary reducer 300 also needs to be assembled to the motor shaft 210 before being assembled into the housing 20a. The reducer housing pre-assembly device 202 can fix the planetary reducer 300 during the installation process, and the reducer housing pre-assembly device 202 can cooperate with the thimble 201 to jointly install the motor shaft 210, the rotor 230 and the partial gear shaft assembly 310 of the planetary reducer 300 into the housing 20a, and finally the other gear shaft assemblies 310 of the planetary reducer 300 and the reducer housing are installed.

[0084] The power assembly 20 provided in the embodiments of the present application will be described in detail below.

[0085] Figure 5 is a schematic view of the housing 20a of the power assembly 20 provided in the embodiments of the present application, Figure 6 is Figure 3 is a partial enlarged view of the M1 part of the power assembly 20, Figure 7 is Figure 5 is a partial enlarged view of the M2 part of the housing 20a.

[0086] In an embodiment, as shown in Figures 3 to 7 , the housing 20a of the power assembly 20 is used to accommodate the rotors 230 and the stators 220 of the two drive motors 200, and the housing 20a comprises a middle partition plate 400, which comprises two bearing grooves 420 and two recesses 410, as shown in Figure 7 , the slots 421 of the two bearing grooves 420 are opposite along the axial direction O of the drive motor 200, and each bearing groove 420 is used to rotationally connect a motor shaft 210 of a drive motor 200. Among them, the two recesses 410 are respectively distributed on the groove bottoms 422 of the two bearing grooves 420, the slots 412 of each recess 410 are opposite along the axial direction O of the drive motor 200, and the groove bottom 411 of each recess 410 comprises an oil outlet hole 4110, and the oil outlet holes 4110 of the two recesses 410 are used to respectively deliver the oil liquid transmitted by the internal flow channel 430 of the middle partition plate 400 to the motor shaft 210 rotationally connected by the two bearing grooves 420.

[0087] In the embodiments of the present application, during the installation of the drive motor 200 in the power assembly 20, the stator 220 of the drive motor 200 is first fitted into the housing 20a of the power assembly 20 by interference, and then the motor shaft 210 fixed with the rotor 230 is assembled into the housing 20a. However, during the process of assembling the rotor 230 into the housing 20a, the rotor 230 itself is difficult to be positioned and guided, and because the rotor 230 contains a magnetic steel, the rotor 230 will generate an attractive force to the stator core of the stator 220, causing the rotor 230 to be attracted and deviated, thereby damaging the walls of the stator 220 and the rotor 230. Therefore, positioning and guiding of the rotor 230 are required during assembly to avoid the rotor 230 from being attracted and deviated. The two recesses 410 are respectively distributed on the groove bottoms 422 of the two bearing grooves 420, and the slots 412 of each recess 410 are opposite along the axial direction O of the drive motor 200, so that during the process of assembling the rotor 230 of the drive motor 200 into the housing 20a of the power assembly 20, the thimble 201 can be inserted into the recess 410, so that the rotor 230 and the motor shaft 210 of the drive motor 200 can be inserted and installed into the housing 20a along the thimble 201, so that the rotor 230 will not be attracted and deviated, and the reliability of the assembly of the rotor 230 is ensured.

[0088] In the embodiment of the present application, the groove bottom 411 of each groove 410 comprises an oil outlet hole 4110, and the oil outlet holes 4110 of the two grooves 410 are used to respectively deliver the oil liquid transmitted by the internal flow channel 430 of the partition plate 400 to the motor shafts 210 connected by the two bearing grooves 420, so that the oil liquid transmitted by the internal flow channel 430 of the partition plate 400 can be simultaneously input into the motor shafts 210 of the two drive motors 200, realizing parallel flow of the oil liquid, and further making the oil liquid in the internal flow channel 430 of the partition plate 400 can simultaneously supply the rotors 230 of the two drive motors 200 and the two planetary reducers 300 for cooling and lubrication, which is beneficial to improve the cooling and lubrication efficiency of the power assembly 20, and can also simplify the arrangement of the oil channel in the housing 20a. In the embodiment of the present application, the groove 410 of the partition plate 400 used for forming the oil outlet hole 4110 is used as a support structure for supporting the thimble 201 to prevent the rotor 230 from being attracted and deviated by the magnetic force of the stator 220 during the installation process of the rotor 230, which simplifies the structure and assembly device.

[0089] In the embodiment of the present application, as shown in Figure 4 and Figure 6 each bearing groove 420 is used to accommodate a bearing 211 of a motor shaft 210, the inner wall of each bearing groove 420 is used to fix the outer ring of the bearing 211 of the motor shaft 210, and each motor shaft 210 is used to fix the inner ring of the bearing 211 of the motor shaft 210. In the process of installing the motor shaft 210 and the rotor 230 along the thimble 201, in one embodiment, the bearing 211 can be pre-assembled on one end of the motor shaft 210 in an interference fit, and the assembly is completed when the bearing 211 moves to the bearing groove 420 and is fixed. In one embodiment, the bearing 211 can be pre-assembled in the bearing groove 420, and the assembly is completed when one end of the motor shaft 210 is inserted into the bearing 211 and fixed.

[0090] In the embodiment of the present application, two recesses 410 are arranged by using two bearing grooves 420 on the middle plate 400 of the shell 20a, and the slots 412 of the two recesses 410 are opposite along the axial direction O of the driving motor 200, so that the thimbles 201 can be inserted into the recesses 410 from the direction of the slots 412 of the two recesses 410 respectively, and then the motor shaft 210 and the rotor 230 are sleeved on the thimbles 201, and are installed by sliding on the outer periphery of the thimbles 201, which can prevent the rotor 230 from being deviated by the magnetic force of the stator 220 during the installation process, and can directly use the recesses 410 in which the oil outlet holes 4110 of the middle plate 400 are formed as the support structure for supporting the thimbles 201, thereby simplifying the assembly device. The oil outlet holes 4110 at the bottom of each recess 410 can output the oil in the internal flow channel 430 of the middle plate 400 to the space originally used for the motor shaft 210 passing through the thimbles 201 during the operation of the power assembly 20, so as to realize the parallel flow of the oil and improve the cooling and lubricating efficiency of the power assembly 20.

[0091] In an embodiment, as shown in Figure 5 , the two recesses 410 are integrally cast with the middle plate 400 of the shell 20a of the power assembly 20, which is beneficial to make the recesses 410 and the shell 20a have strong rigidity, and is more convenient to use the recesses 410 to support the thimbles 201 to install the motor shaft 210 and the rotor 230.

[0092] In an embodiment, as shown in Figure 5 , the recesses 410 are coaxial with the bearing grooves 420 where the recesses 410 are located.

[0093] In the embodiment of the present application, as shown in Figure 4 and Figure 5 , the recesses 410 are coaxial with the bearing grooves 420 where the recesses 410 are located, and the bearing grooves 420 are coaxial with the motor shaft 210 to which the bearing grooves 420 are rotationally connected, so that the recesses 410 can be coaxial with the motor shaft 210, thereby avoiding the deviation of the thimbles 201 from the axis of the motor shaft 210 when the thimbles 201 are inserted into the recesses 410, and avoiding the deviation of the motor shaft 210 and the rotor 230 during the combined installation of the thimbles 201, so as to prevent the rotor 230 from being worn by the stator 220, and to make the installation process more reliable.

[0094] In an embodiment, as shown in Figure 5 , the recesses 410 can be circular grooves or square grooves, and only need to ensure that the center of the recess 410 is coaxial with the bearing groove 420 where the recess 410 is located.

[0095] In an embodiment, as shown in Figure 7 , the hole diameter of the oil outlet hole 4110 along the radial direction R of the driving motor 200 is smaller than the width of the slot 412 of the recess 410.

[0096] In the embodiments of the present application, as shown in Figure 4 and Figure 7 , the diameter of the oil outlet hole 4110 along the radial direction R of the driving motor 200 is denoted as L1, the width of the slot opening 412 of the groove 410 is denoted as L2, and L1 < L2. In this way, the plunger 201 can be prevented from penetrating out of the groove bottom 411 of the groove 410 and into the oil outlet hole 4110, and the groove bottom 411 of the groove 410 can more conveniently support and limit the plunger 201, thereby improving the assembly reliability of the rotor 230.

[0097] In the embodiments of the present application, if the diameter of the oil outlet hole 4110 is equal to the width of the slot opening 412 of the groove 410, the plunger 201 will penetrate through the groove 410 and the oil outlet hole 4110, and the plunger 201 along the axial direction O of the driving motor 200 cannot be limited by the groove 410, which is prone to cause the assembly process of the rotor 230 to be unreliable.

[0098] In one embodiment, as shown in Figure 7 , the width of the groove bottom 411 of the groove 410 along the radial direction R of the driving motor 200 is less than the width of the slot opening 412 of the groove 410.

[0099] In the embodiments of the present application, as shown in Figure 4 and Figure 7 , the width of the groove bottom 411 of the groove 410 along the radial direction R of the driving motor 200 is denoted as L3, the width of the slot opening 412 of the groove 410 is denoted as L2, L3 < L2, L2 is relatively large, which facilitates the plunger 201 to penetrate into the groove bottom 411 of the groove 410 from the slot opening 412 of the groove 410 and abut against the groove bottom 411 of the groove 410, thereby achieving the limiting installation of the plunger 201. L3 is relatively small, which can prevent the plunger 201 from penetrating through the groove bottom 411 of the groove 410, thereby ensuring the stability of the installation process of the motor shaft 210 and the rotor 230.

[0100] Figure 8 is another schematic view of the housing 20a of the power assembly 20 provided in the embodiments of the present application.

[0101] In one embodiment, as shown in Figure 4 and Figure 8 , the width of the groove bottom 411 of the groove 410 along the radial direction R of the driving motor 200 is equal to the width of the slot opening 412 of the groove 410, and the diameter of the oil outlet hole 4110 is less than the width of the groove bottom 411 of the groove 410. At this time, the plunger 201 can be limited and abutted by the part of the groove bottom 411 of the groove 410 except the oil outlet hole 4110, and the assembly of the rotor 230 of the driving motor 200 can also be reliable.

[0102] In one embodiment, as shown in Figure 3 , Figure 7 and Figure 8As shown, the hole diameter of the oil outlet hole 4110 along the radial direction R of the driving motor 200 is less than or equal to the width of the groove bottom 411 of the groove 410. This enables the oil in the internal flow channel 430 of the partition plate 400 to be transported out of the groove 410 through the oil outlet hole 4110 into the motor shaft 210 while reliably ensuring the strength of the partition plate 400, avoiding the hole diameter of the oil outlet hole 4110 being too large to affect the structural strength of the partition plate 400.

[0103] In an embodiment, as shown in Figure 7 , the groove width of the groove 410 along the radial direction R of the driving motor 200 gradually increases from the groove bottom 411 of the groove 410 to the groove opening 412 of the groove 410.

[0104] In the embodiment of the present application, as shown in Figure 4 and Figure 7 , the groove width of the groove 410 along the radial direction R of the driving motor 200 gradually increases from the groove bottom 411 of the groove 410 to the groove opening 412 of the groove 410, so that the groove peripheral wall of the groove 410 is in the shape of a truncated cone. This enables the groove peripheral wall of the groove 410 in the shape of a truncated cone to have a larger contact area with the pointed needle 201, improving the stability after the pointed needle 201 is inserted, thereby facilitating the stability when the rotor 230 is assembled into the housing 20a along the outer periphery of the pointed needle 201.

[0105] In the embodiment of the present application, the groove peripheral wall of the groove 410 in the shape of a truncated cone also has a guiding effect on the pointed needle 201, making it more convenient for the pointed needle 201 to smoothly penetrate into the groove 410.

[0106] In an embodiment, as shown in Figure 7 , the partition plate 400 includes a protrusion 440 protruding from the groove bottom 422 of the bearing groove 420, and the groove 410 is distributed on the end face 441 of the protrusion 440 away from the groove bottom 422 of the bearing groove 420.

[0107] In the embodiment of the present application, as shown in Figure 4 and Figure 7 , the protrusion 440 protrudes from the groove bottom 422 of the bearing groove 420, and the groove 410 is distributed on the end face 441 of the protrusion 440 away from the groove bottom 422 of the bearing groove 420. This enables the groove 410 to be closer to the assembly direction of the rotor 230 of the driving motor 200, facilitating the pointed needle 201 to quickly enter the groove 410, and also avoiding the pointed needle 201 from colliding with the groove bottom 422 of the bearing groove 420 to affect the structural strength of the partition plate 400, thereby making the power assembly 20 more stable.

[0108] In an embodiment, as shown in Figure 7 , the length of the protrusion 440 along the axial direction O of the driving motor 200 is greater than the groove depth of one bearing groove 420.

[0109] In the embodiments of the present application, as shown in Figure 4 and Figure 7 , the length of the protrusion 440 along the axial direction O of the driving motor 200 is denoted as L4, the groove depth of the bearing groove 420 is denoted as L5, L4>L5, so that the grooves 410 distributed on the end face 441 of the protrusion 440 can be farther away from the groove bottom 422 of the bearing groove 420, so that the plunger 201 can be quickly assembled with the grooves 410 on the end face 441 of the protrusion 440.

[0110] In the embodiments of the present application, as shown in Figure 3 and Figure 7 , the length of the protrusion 440 along the axial direction O of the driving motor 200 is large, the grooves 410 are located on the end face 441 of the protrusion 440, and the oil outlet hole 4110 is located on the groove bottom 411 of the groove 410, so that the oil outlet hole 4110 can also more conveniently input the oil in the internal flow channel 430 of the middle partition plate 400 into the motor shaft 210 through the flow channel in the protrusion 440.

[0111] In one embodiment, as shown in Figure 6 , the groove depth of the groove 410 along the axial direction O of the driving motor 200 is smaller than the length of the protrusion 440.

[0112] In the embodiments of the present application, as shown in Figure 4 and Figure 6 , the groove depth of the groove 410 along the axial direction O of the driving motor 200 is denoted as L6, the length of the protrusion 440 is L4, L6

[0113] In the embodiments of the present application, if the groove depth of the groove 410 is greater than the length of the protrusion 440, the groove 410 needs to be arranged by the thickness of the middle partition plate 400, which is easy to reduce the structural strength of the shell 20a.

[0114] In one embodiment, as shown in Figure 3 and Figure 6 , the motor shaft 210 includes a shaft hole 212, the shaft hole 212 penetrates the motor shaft 210 along the axial direction O of the driving motor 200, the protrusion 440 protrudes towards the shaft hole 212, and the inner diameter of the shaft hole 212 is greater than the inner diameter of the oil outlet hole 4110.

[0115] In the embodiment of the present application, the motor shaft 210 comprises a shaft hole 212 penetrating through the motor shaft 210 along the axial direction O of the driving motor 200, so that the oil can flow in the shaft hole 212 of the motor shaft 210, thereby cooling the rotor 230 of the driving motor 200.

[0116] In the embodiment of the present application, the protrusion 440 protrudes towards the inside of the shaft hole 212, so that the oil outlet hole 4110 of the groove bottom 411 of the groove 410 and the end face 441 of the groove 410 away from the groove bottom 422 of the bearing groove 420 can also be directed towards the inside of the shaft hole 212, thereby facilitating the smooth output of the oil in the internal flow channel 430 of the partition plate 400 to the shaft cavity of the motor shaft 210 through the internal flow channel of the protrusion 440.

[0117] In the embodiment of the present application, the inner diameter of the shaft hole 212 is denoted as L7, and the inner diameter of the oil outlet hole 4110 is denoted as L8, L7>L8, so that the shaft hole 212 can accommodate the thimble 201, and the oil outlet hole 4110 of the groove bottom 411 of the groove 410 cannot accommodate the thimble 201, thereby avoiding the thimble 201 from penetrating out of the oil outlet hole 4110 and failing to stably guide the assembly of the motor shaft 210 and the rotor 230, and ensuring the reliability of the assembly.

[0118] In one embodiment, as shown in Figure 6 , the shaft hole 212 comprises a first section 2121 and a second section 2122, the inner diameter of the first section 2121 is greater than that of the second section 2122, the protrusion 440 is inserted into the first section 2121, and the portion of the motor shaft 210 where the second section 2122 is located is used to fix the rotor 230, the protrusion 440 is spaced from the second section 2122 along the axial direction O of the driving motor 200, and the groove opening 412 of the groove 410 is directed towards the second section 2122.

[0119] In the embodiment of the present application, as shown in Figure 3 and Figure 6 , the inner diameter of the first section 2121 is denoted as L9, and the inner diameter of the second section 2122 is denoted as L10, L9>L10, the protrusion 440 is inserted into the first section 2121, L9 is larger, facilitating the insertion of the protrusion 440 into the first section 2121, and also spacing the protrusion 440 from the first section 2121 along the radial direction R of the driving motor 200, thereby avoiding the abrasion between the first section 2121 and the protrusion 440 during the rotation of the motor shaft 210. L10 is smaller, which is conducive to the gapless cooperation between the thimble 201 and the shaft hole 212 of the motor shaft 210, making the assembly process of the rotor 230 and the motor shaft 210 more stable and reliable, and also making the portion of the motor shaft 210 where the second section 2122 is located have a large structural strength, thereby making the fixation of the rotor 230 more reliable.

[0120] In the embodiment of the present application, the protrusion 440 is spaced apart from the second section 2122 along the axial direction O of the motor shaft 210, which is conducive to avoiding wear between the protrusion 440 and the second section 2122 during rotation of the motor shaft 210.

[0121] In the embodiment of the present application, the notch 412 of the recess 410 faces the second section 2122, so that the oil outlet hole 4110 located at the groove bottom 411 of the recess 410 can directly input into the second section 2122 of the shaft hole 212 through the notch 412 of the recess 410, which is also conducive to reducing leakage of oil from the space between the first section 2121 and the notch 412 of the recess 410, so that more oil can be transported through the motor shaft 210, so that the oil can meet the lubrication requirements of the rotor 230 of the driving motor 200 and the planetary reducer 300.

[0122] In one embodiment, as shown in Figure 6 The outer side of the motor shaft 210 includes a limiting groove 213, which is arranged around the outer side wall of the first section 2121 of the shaft hole 212. The limiting groove 213 is used to abut the bearing 211 of the motor shaft 210, so that the rotor 230 and the motor shaft 210 can be limited by the limiting groove 213 and the bearing groove 420 when assembled by the plunger 201, which makes the assembly more accurate.

[0123] In one embodiment, as shown in Figure 6 The space between the protrusion 440 and the first section 2121 is used to accommodate the conductive ring 500, which is used to electrically connect the protrusion 440 and the first section 2121.

[0124] In the embodiment of the present application, the space between the protrusion 440 and the first section 2121 is used to accommodate the conductive ring 500, which is used to electrically connect the protrusion 440 and the first section 2121. Compared with arranging the conductive ring 500 on the outer wall of the motor shaft 210, it is conducive to shortening the axial dimension of the power assembly 20. The conductive ring 500 is used to electrically connect the protrusion 440 and the first section 2121, so that the shaft current generated during rotation of the motor shaft 210 can be conducted to the conductive ring 500 through the first section 2121, and then conducted to the protrusion 440 on the partition plate 400 through the conductive ring 500, achieving grounding, which can avoid electric corrosion of the bearing 211 of the motor shaft 210.

[0125] Figure 9 Another schematic view of the housing 20a of the power assembly 20 provided in the embodiment of the present application.

[0126] In one embodiment, as shown in Figure 6 and Figure 9As shown, the protrusion 440 includes a fixing section 442 and a communicating section 443, the fixing section 442 is closer to the second section 2122 than the communicating section 443, the outer diameter of the communicating section 443 is greater than that of the fixing section 442, the fixing section 442 is used for fixing the conductive ring 500, and the end face 4431 of the communicating section 443 towards the fixing section 442 is used for abutting against the conductive ring 500.

[0127] In the embodiment of the present application, the outer diameter of the communicating section 443 is denoted as L11, and the outer diameter of the fixing section 442 is denoted as L12, the fixing section 442 is used for fixing the conductive ring 500, L11>L12, which is more convenient for fixing the conductive ring 500 on the fixing section 442 from the direction of the slot opening 421 of the bearing groove 420. L11>L12, which also makes the end face 4431 of the communicating section 443 towards the fixing section 442 can be used for abutting against the conductive ring 500, avoiding the conductive ring 500 rotating with the motor shaft 210 in the first section 2121.

[0128] In an embodiment, as shown in Figure 3 and Figure 6 As shown, the shaft hole 212 is used for accommodating the oil guide pipe 600, one end 610 of the oil guide pipe 600 is fixed to the protrusion 440 to receive the oil liquid delivered by the oil outlet hole 4110, and the other end 620 of the oil guide pipe 600 is used for extending into the planetary reducer 300 to deliver the oil liquid to the planetary reducer 300.

[0129] In the embodiment of the present application, since the protrusion 440 is located in the first section 2121 of the shaft hole 212, the oil delivery distance of the oil outlet hole 4110 in the protrusion 440 is short, by arranging the oil guide pipe 600 in the shaft hole 212 of the motor shaft 210, using one end 610 of the oil guide pipe 600 to be fixed to the protrusion 440 to receive the oil liquid delivered by the oil outlet hole 4110, and using the other end 620 of the oil guide pipe 600 to extend into the planetary reducer 300 to deliver the oil liquid to the planetary reducer 300, it can avoid that the oil liquid in the shaft hole 212 of the motor shaft 210 is all thrown out of the motor shaft 210 during the rotation of the motor shaft 210, so that the oil liquid output by the oil outlet hole 4110 can be delivered for a longer distance, thereby ensuring that the planetary reducer 300 located at the other end 620 of the oil guide pipe 600 can receive enough oil liquid for lubrication, meeting the lubrication requirement of the gear shaft assembly 310 of the planetary reducer 300.

[0130] In an embodiment, the oil guide pipe 600 is rotationally connected with the motor shaft 210 through the support bearing 630.

[0131] In an embodiment, as shown in Figure 3As shown, the outer wall of the oil guide pipe 600 and the outer wall of the motor shaft 210 both include through holes, so that the oil liquid in the oil guide pipe 600 can flow out from the through holes of the outer wall of the oil guide pipe 600 and the through holes of the outer wall of the motor shaft 210 to the rotor 230 of the driving motor 200, and the rotor 230 is cooled, which is beneficial to ensure the normal operation of the driving motor 200.

[0132] The power assembly, the mounting device and the electric vehicle provided by the embodiments of the present application are described in detail above, and the principles and embodiments of the present application are described by applying specific examples. The above embodiment is only used to help understand the method and the core idea of the present application. Meanwhile, for those skilled in the art, according to the idea of the present application, the specific embodiments and application range will be changed, and the above description should not be understood as a limitation of the present application.

Claims

1. A powertrain, characterized by, The housing of the power assembly is used to accommodate rotors and stators of two driving motors, the housing comprises a middle partition plate, the middle partition plate comprises two bearing grooves and two recesses, the two bearing grooves are opposite along the axial direction of the driving motor, each of the two bearing grooves is used to rotatably connect a motor shaft of one of the driving motors, wherein: The two recesses are respectively distributed on the groove bottoms of the two bearing grooves, the groove opening of each of the two recesses is opposite along the axial direction of the driving motor, the groove bottom of each of the two recesses comprises an oil outlet hole, the oil outlet holes of the two recesses are respectively used to deliver oil delivered by an internal flow channel of the middle partition plate to the motor shaft rotatably connected by the two bearing grooves.

2. The powertrain of claim 1, wherein, The recess is coaxial with the bearing groove where the recess is located.

3. The powertrain of claim 1 or 2, wherein, The hole diameter of the oil outlet hole along the radial direction of the driving motor is smaller than the width of the groove opening of the recess.

4. The powertrain of any one of claims 1-3, wherein, The width of the groove bottom of the recess along the radial direction of the driving motor is smaller than the width of the groove opening of the recess.

5. The powertrain of claim 4, wherein, The groove width of the recess along the radial direction of the driving motor gradually increases from the groove bottom of the recess to the groove opening of the recess.

6. The powertrain of any one of claims 1-5, wherein, The middle partition plate comprises a protrusion, the protrusion protrudes from the groove bottom of the bearing groove, and the recess is distributed on the end face of the protrusion away from the groove bottom of the bearing groove.

7. The powertrain of claim 6, wherein, The length of the protrusion along the axial direction of the driving motor is greater than the groove depth of the bearing groove.

8. The powertrain of claim 6, wherein, The groove depth of the recess along the axial direction of the driving motor is smaller than the length of the protrusion.

9. The powertrain of claim 6, wherein, The motor shaft comprises a shaft hole, the shaft hole penetrates the motor shaft along the axial direction of the driving motor, the protrusion protrudes into the shaft hole, and the inner diameter of the shaft hole is greater than the inner diameter of the oil outlet hole.

10. The powertrain of claim 9, wherein, The shaft hole comprises a first section and a second section, the inner diameter of the first section is greater than the inner diameter of the second section, the protrusion is inserted into the first section, the part of the motor shaft where the second section is located is used to fix the rotor, the protrusion and the second section are spaced apart along the axial direction of the driving motor, and the groove opening of the recess is directed to the second section.

11. The powertrain of claim 10, wherein, The space between the protrusion and the first section is used to accommodate a conductive ring, and the conductive ring is used to electrically connect the protrusion and the first section.

12. The powertrain of claim 11, wherein, The protrusion comprises a fixed section and a communication section, the fixed section is closer to the second section than the communication section, the outer diameter of the communication section is greater than the outer diameter of the fixed section, the fixed section is used to fix the conductive ring, and the end face of the communication section directed to the fixed section is used to abut against the conductive ring.

13. The powertrain of claim 10, wherein, The shaft hole is used to accommodate an oil guide pipe, one end of the oil guide pipe is fixed to the protrusion to receive oil delivered by the oil outlet hole, and the other end of the oil guide pipe is used to extend into a planetary reducer to deliver oil to the planetary reducer.

14. A powertrain mounting arrangement characterised in that, The mounting device is used to mount the power assembly of any one of claims 1-13, the housing is used to fix the stator, the motor shaft is used to fix the rotor, the mounting device comprises a thimble, one end of the thimble is used to be inserted into the recess to abut against the groove bottom or the groove wall of the recess, and the motor shaft with the rotor fixed thereon is used to be sleeved on the outer periphery of the thimble and moved along the thimble to the bearing groove of the middle partition plate.

15. An electric vehicle, characterized by The electric vehicle comprises a frame and the power assembly according to any one of claims 1-13, the frame is used for fixing the power assembly, and the driving motor of the power assembly is used for driving a wheel.

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