Integrated electric wheel with cooling function

Abstract

An integrated electric wheel with a cooling function comprises a hub motor with a cooling water channel, a planetary reducer connected with a rotating shaft of the hub motor, a hub connected with the output end of the planetary reducer and a brake fixed to the hub, and is characterized in that the cooling water channel in the hub motor extends forwards to the periphery of the planetary reducer; and the planetary reducer is circularly cooled, and an oil guide assembly for collecting oil liquid thrown out in the circumferential direction and conducting lubricating and heat dissipation on the planetary reducer is assembled on the planetary reducer. Lubricating and radiating efficiency of parts close to the center of the speed reducer is effectively improved, temperature rise and part abrasion in the speed reducer are slowed down, the probability of abnormal transmission caused by bearing sintering and gear abrasion due to high temperature is effectively reduced, transmission reliability of the planetary speed reducer is improved, and the service life of the planetary speed reducer is prolonged. Integrated optimization of multiple structures of the electric wheel is formed, the integration degree is improved, whole vehicle arrangement is facilitated, the power density of the electric wheel is improved, and the cruising ability of the electric wheel is improved.

Description

Technical Field

[0001] The invention relates to an integrated electric wheel with a cooling function, belonging to the technical field of electric drive wheels for new energy vehicles. Background Art

[0002] Electric wheel technology is also known as in-wheel motor technology. This motor is also called a hub motor. Its biggest feature is that the power unit, transmission unit and brake unit are all integrated into the wheel hub, which greatly simplifies the mechanical part of the electric vehicle. Compared with other drive forms, it has many advantages such as short transmission chain, high transmission efficiency and flexible layout. Therefore, the three-in-one electric wheel composed of a drive motor, a reducer and a brake device is becoming more and more widely used. In order to improve the installation flexibility of the electric wheel and extend the electric drive endurance of the electric wheel, the volume and weight of the electric wheel have been emphasized to be miniaturized and lightweight. The relevant comparative documents retrieved are: 1. CN201410029721.5- reduction motor for pure electric vehicles; 2. CN201710537653.7-A hub motor for automobiles; 3.CN201910414934.2-Waterproof high power density high torque highly integrated hub motor; 4. CN202110449146.4-Small and lightweight dual-brake high-power heavy-load electric wheel assembly; 5.CN202311400522.6-Oil-cooled wheel-side traction motor and reducer integrated structure for mining electric wheel dump truck.

[0003] The following problems were also found during the application of the three-in-one electric wheel: 1. Since the transmission device and braking device are integrated in a small space, the electric wheel generates a lot of heat and has extremely high requirements for the heat dissipation of the reduction mechanism. In the traditional cooling method, the reducer adopts splash cooling, and the motor is cooled through the cooling water channel on the shell; in the case of low speed and high torque, braking down a long slope, etc., the traditional cooling method cannot meet the heat dissipation requirements of the system. Some electric wheels add additional cooling mechanisms in the reduction mechanism to meet their heat dissipation requirements, but this will take up extra space and affect the assembly of other parts of the car.

[0004] 2. Due to the centrifugal force, when the electric wheel is running, the oil will be distributed in a circular shape. At this time, the components at the center of the reducer cannot be effectively lubricated and dissipated, which accelerates the temperature rise in the reducer. The high temperature causes adverse consequences such as accelerated wear of gears and sintering of bearings, and increases the internal oil pressure, increasing the risk of oil leakage.

[0005] 3. For electric vehicles, especially those with large tonnage, there are strict restrictions on vehicle load, power requirements and axial and radial space of the wheel hub. The electric wheels and vehicles use large-ratio reducers, external disc brakes, and traditional wheel structure for load bearing. The integration is not high enough, which is not conducive to the control of volume and weight and the reduction of axial dimensions, and also affects the overall vehicle layout and the endurance of the electric wheels. Summary of the invention

[0006] The integrated electric wheel with cooling function provided by the present invention integrates the circulating cooling water circuits of the reducer and the motor, thereby improving the overall heat dissipation capacity of the electric wheel and the structural compactness of the electric wheel, effectively improving the lubrication and heat dissipation efficiency of the components near the center of the reducer, slowing down the temperature rise and component wear in the reducer, and effectively reducing the probability of bearing sintering and gear wear and transmission abnormalities caused by high temperature, improving the transmission reliability of the planetary reducer, and extending the service life of the planetary reducer, forming an integrated optimization of multiple structures of the electric wheel, improving the integration level, reducing the overall weight and axial size of the electric wheel, which is beneficial to the layout of the entire vehicle, and improving the power density of the electric wheel to improve its endurance.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is: An integrated electric wheel with cooling function comprises a hub motor with a cooling water channel, a planetary reducer connected to the rotating shaft of the hub motor, a hub connected to the output end of the planetary reducer and a brake fixed to the hub, and is characterized in that the cooling water channel in the hub motor extends forward to the outer periphery of the planetary reducer to circulate and cool the planetary reducer, and the planetary reducer is equipped with an oil guide component for collecting oil ejected from the circumference and lubricating and dissipating heat for the planetary reducer.

[0008] Preferably, the housing of the hub motor includes a rear end cover, a machine base and a front end cover which are fixed in sequence from back to front, a cooling water channel for cooling the hub motor is provided on the machine base, and a water nozzle which is respectively connected to the water inlet and outlet of the cooling water channel is installed on the machine base, the front end cover extends forward to the outer periphery of the planetary reducer, and an annular water channel connected to the cooling water channel on the machine base is provided on the front end cover, and the annular water channel and the cooling water channel are connected in series to form a circulating water circuit.

[0009] Preferably, the planetary reducer includes a first-stage planetary reducer connected to the rotating shaft of the hub motor and a second-stage planetary reducer connected to the output end of the first-stage planetary reducer. The ring gear of the first-stage planetary reducer and the ring gear of the second-stage planetary reducer are spline-connected and fixed to the front end cover as the housing of the planetary reducer. The wheel hub is coaxially fixed to the second-stage planetary carrier in the second-stage planetary reducer, and the front end cover extends forward to the outer periphery of the first-stage planetary reducer.

[0010] Preferably, a sealing end cover for sealing the oil inside the electric wheel is fixed on the outer end of the secondary planetary carrier of the secondary planetary reduction, and a detachable breathable plug is installed in the center of the sealing end cover.

[0011] Preferably, the brake comprises a brake disc fixed to the wheel hub and a brake caliper cooperating with the brake disc, the brake caliper is equipped with a brake pad and a piston that pushes the brake pad to move toward the brake disc, the brake caliper comprises a caliper body one and a caliper body two detachably connected to the caliper body one, the caliper body one is integrally formed with the front end cover, and the caliper body two is located at the outer periphery of the wheel hub.

[0012] Preferably, the first-stage planetary carrier of the first-stage planetary reduction has a hollow planetary gear shaft, the first-stage planetary gear of the first-stage planetary reduction is mounted on the planetary gear shaft through a needle bearing, the oil guide assembly is mounted on the first-stage planetary carrier and connected to the planetary gear shaft, and the oil is introduced into the needle bearing.

[0013] Preferably, the oil guide assembly includes a connecting ring, an oil collecting hopper that can collect the oil thrown out from the circumferential direction and corresponds one-to-one with the planetary gear shaft, and an oil guide sleeve that can guide the oil into the needle bearing. The connecting ring, the oil collecting hopper and the oil guide sleeve are integrally formed, the oil guide sleeve corresponds one-to-one with the oil collecting hopper and is connected, the oil guide sleeve is interference pressed into the planetary gear shaft, and the connecting ring rests on the end face of the primary planetary carrier.

[0014] Preferably, the oil collecting hopper is arranged on the outer periphery of the connecting ring and has a semicircular cross section, and the opening of the oil collecting hopper is flush with the inner edge of the connecting ring.

[0015] Preferably, a radial oil guide hole connected to the needle roller bearing is provided on the planetary gear shaft, a positioning plate is covered on the free end surface of the needle roller bearing, a clamp is clamped on the planetary gear shaft for axially positioning the positioning plate, and an oil hole is provided on the positioning plate.

[0016] The beneficial effects of the present invention are: In the integrated electric wheel with cooling function of the present invention, the cooling water channel in the hub motor extends forward to the periphery of the planetary reducer, and circulates and cools the planetary reducer, thereby cooling the motor and the reducer together, meeting the heat dissipation demand of the front end part of the reducer connected to the motor and with a high rotation speed, and avoiding the need to add an additional cooling mechanism to the planetary reducer. The circulating cooling water channels of the reducer and the motor are integrated together, thereby improving the overall heat dissipation capacity of the electric wheel and improving the structural compactness of the electric wheel.

[0017] An oil guide assembly is installed on the planetary reducer to collect splashed oil thrown out from the circumference during operation, and to lubricate and dissipate heat for the planetary reducer, effectively improving the lubrication and heat dissipation efficiency of the components near the center of the reducer, slowing down the temperature rise and component wear in the reducer, and effectively reducing the probability of bearing sintering and gear wear and transmission abnormalities caused by high temperature, thereby improving the transmission reliability of the planetary reducer and extending the service life of the planetary reducer.

[0018] The front end cover is extended forward to the outer periphery of the first-stage planetary reduction, and an annular water channel is opened on the front end cover. The front end cover of the motor is used as the cooling shell of the first-stage planetary reduction, the ring gear of the first-stage planetary reduction is used as the shell of the planetary reduction gear, and the caliper body of the brake is integrally formed with the front end cover. The front end cover is used as a part of the brake caliper, thereby forming an integrated optimization of multiple structures of the electric wheel, improving the integration level, reducing the overall weight and axial size of the electric wheel, facilitating the layout of the entire vehicle, and improving the power density of the electric wheel to improve its endurance. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the integrated electric wheel with cooling function of the present invention.

[0020] Figure 2 Another schematic diagram of the integrated electric wheel with cooling function.

[0021] Figure 3 Schematic diagram of the annular water channel opened on the front cover.

[0022] Figure 4 It is a schematic diagram of the connection between the annular water channel and the cooling water channel on the machine base.

[0023] Figure 5 This is a half-section schematic diagram of an integrated electric wheel with cooling function.

[0024] Figure 6 Schematic diagram of the first-stage planetary deceleration.

[0025] Figure 7 Schematic diagram of the oil guide assembly. DETAILED DESCRIPTION

[0026] Combine the following Figures 1 to 7 The embodiments of the present invention are described in detail.

[0027] An integrated electric wheel with cooling function comprises a hub motor 1 with a cooling water channel, a planetary reducer 2 connected to the rotating shaft of the hub motor 1, a hub 3 connected to the output end of the planetary reducer 2, and a brake 4 fixed to the hub 3, wherein the cooling water channel in the hub motor extends forward to the outer periphery of the planetary reducer 2 to circulate and cool the planetary reducer 2, and an oil guide component 5 is installed on the planetary reducer 2 to collect the oil ejected from the circumference and lubricate and dissipate heat for the planetary reducer.

[0028] In the above-mentioned integrated electric wheel with cooling function, the cooling water channel in the hub motor 1 extends forward to the outer periphery of the planetary reducer 2, and circulates and cools the planetary reducer 2, forming a cooling of the motor and reducer together, meeting the heat dissipation requirements of the front end of the reducer connected to the motor and having a high rotation speed, and avoiding the need to add an additional cooling mechanism to the planetary reducer 2, integrating the circulating cooling water channels of the reducer and the motor together, improving the overall heat dissipation capacity of the electric wheel, and improving the structural compactness of the electric wheel. An oil guide assembly 5 is assembled on the planetary reducer 2 to collect splashing oil thrown from the circumference during operation, and lubricate and dissipate heat for the planetary reducer 2, effectively improving the lubrication and heat dissipation efficiency of the components near the center of the reducer, slowing down the temperature rise and component wear in the reducer, effectively reducing the probability of bearing sintering and gear wear transmission abnormalities caused by high temperature, improving the transmission reliability of the planetary reducer, and extending the service life of the planetary reducer 2.

[0029] The housing of the hub motor 1 includes a rear end cover 6, a base 7 and a front end cover 8 which are fixed in sequence from the back to the front. A cooling water channel 71 for cooling the hub motor 1 is provided on the base 7, and a water nozzle 72 which is connected to the water inlet and outlet of the cooling water channel 71 is installed on the base 7. The front end cover 8 extends forward to the periphery of the planetary reducer 2. An annular water channel 81 which is connected to the cooling water channel on the base 7 is provided on the front end cover 8. The annular water channel 81 is connected in series with the cooling water channel 6 to form a circulating water channel. The front end cover 8 is extended forward to the periphery of the planetary reducer 2, and an annular water channel 81 is provided on the front end cover 8. The front end cover 8 of the motor is used as the cooling shell of the planetary reducer 2, which meets the heat dissipation requirements of the planetary reducer 8, avoids the need to provide an additional cooling mechanism for the planetary reducer 8, and eliminates the configuration and connection of the cooling pipeline, which simplifies the structure of the electric wheel, improves the structural compactness of the electric wheel, and improves its integration.

[0030] The planetary reducer 2 includes a primary planetary reducer 9 connected to the rotating shaft of the wheel hub motor 1 and a secondary planetary reducer connected to the output end of the primary planetary reducer 9. The ring gear of the primary planetary reducer and the ring gear of the secondary planetary reducer are spline-connected and fixed to the front end cover 8 as the shell of the planetary reducer 2. The wheel hub 3 is coaxially fixed to the secondary planet carrier in the secondary planetary reducer. The front end cover 8 extends forward to the outer periphery of the primary planetary reducer. The primary planetary reducer 9 includes a primary sun gear, a primary planetary gear meshed on the outer periphery of the primary sun gear, a primary planet carrier connected to the primary planetary gear and a ring gear meshed on the outer periphery of the primary planetary gear. The secondary planetary reducer includes a secondary sun gear coaxially connected to the primary planet carrier, a secondary planetary gear meshed on the outer periphery of the secondary sun gear, a secondary planet carrier connected to the secondary planetary gear and a ring gear meshed on the outer periphery of the secondary planetary gear. The two-stage planetary reducer structure can form a large speed ratio to meet the high torque output requirements. The ring gear 10 of the primary planetary reducer 9 serves as the shell of the planetary reducer 2, eliminating the reducer shell, improving the structural compactness and integration of the planetary reducer 2, and being conducive to the miniaturization and lightweight of the electric wheel.

[0031] Among them, a sealing end cover 11 is fixed on the outer end of the secondary planetary carrier of the secondary planetary reduction to seal the oil inside the electric wheel, and a detachable breathable plug 12 is installed in the center of the sealing end cover. The breathable plug 12 is used for ventilation to prevent the oil inside the reduction unit from increasing due to temperature rise. When the electric wheel is running, the oil is distributed in a circular shape. The breathable plug 12 will not be immersed in the oil for a long time when it is running or standing, eliminating the risk of oil leakage; in addition, the breathable plug 12 can be disassembled and assembled, which is convenient for quickly checking the oil temperature in the electric wheel.

[0032] The brake 4 includes a brake disc 41 fixed to the wheel hub 3, a brake caliper 42 matched with the brake disc 41, a brake pad 43 and a piston 44 for pushing the brake pad 43 to move toward the brake disc are installed in the brake caliper 42, and the brake caliper 43 includes a caliper body 1 45 and a caliper body 2 46 detachably connected to the caliper body 1 45, the caliper body 1 45 is integrally formed with the front end cover 8, and the caliper body 2 46 is located at the periphery of the wheel hub 3. The caliper body 1 45 is integrally formed with the front end cover 8 to improve the compactness and integration of the structure, and the caliper body 2 46 is located at the periphery of the wheel hub 3 for easy disassembly. After the caliper body 2 46 is disassembled, the inner cavity of the caliper body 1 45 is exposed, which is convenient for the inspection and replacement of the brake pad. The front end cover 8 is extended forward to the outer periphery of the first-stage planetary reduction 9, and an annular water channel 81 is opened on the front end cover 8. The front end cover 8 of the motor is used as a cooling shell of the first-stage planetary reduction 9, and the ring gear of the first-stage planetary reduction 9 is used as the shell of the planetary reducer 2. The caliper body 45 of the brake 4 is integrally formed with the front end cover 8, and the front end cover 8 is used as a part of the brake caliper 42, thereby forming an integrated optimization of multiple structures of the electric wheel, improving the integration level, reducing the overall weight and axial size of the electric wheel, being beneficial to the layout of the entire vehicle, and improving the power density of the electric wheel to improve its endurance.

[0033] Among them, the first-stage planetary carrier 91 of the first-stage planetary reduction 9 has a hollow planetary gear shaft 92, the first-stage planetary gear 93 of the first-stage planetary reduction 9 is mounted on the planetary gear shaft 92 through a needle bearing 94, and the oil guide assembly 5 is mounted on the first-stage planetary carrier 91 and connected to the planetary gear shaft 93 to guide the oil into the needle bearing 94. The first-stage planetary reduction 9 is the front end part of the planetary reducer 2, which is directly connected to the hub motor 1. It has a high rotation speed and high requirements for heat dissipation and lubrication. The first-stage planetary gears and the first-stage sun gear can be lubricated by contacting the oil due to the rotation of the gears. During the operation of the planetary reducer 2, the oil will be thrown out from the circumferential direction due to the action of centrifugal force. The needle bearing 94 on the first-stage planetary carrier is close to the center of the first-stage planetary carrier 91, and the probability of lubricating oil splashing thereon is lower, and the effect of lubrication and heat dissipation is poor. In order to improve the lubrication efficiency, the oil guide component 5 is installed on the first-stage planetary carrier 91 to collect the oil splashed from the circumferential direction, and guide the oil into the needle bearing 94 to lubricate it and reduce the temperature rise of the needle bearing 94, so as to reduce the probability of entanglement and accelerated wear of the gears caused by the temperature rise of the needle bearing, improve the lubrication efficiency inside the planetary reducer 2, and enhance the transmission reliability of the planetary reducer 2.

[0034] Among them, the oil guide assembly 5 includes a connecting ring 51, an oil collecting hopper 52 which can collect the oil thrown out from the circumferential direction and corresponds one-to-one with the planetary gear shaft 92, and an oil guide sleeve 53 which can guide the oil into the needle bearing. The connecting ring 51, the oil collecting hopper 52 and the oil guide sleeve 53 are integrally formed, the oil guide sleeve 53 corresponds one-to-one with the oil collecting hopper 52 and is connected, the oil guide sleeve 53 is interference pressed into the planetary gear shaft 92, and the connecting ring 51 is against the end face of the primary planetary carrier 91. As can be seen from the accompanying drawings, the oil guide sleeve 53 is pressed into the planetary gear shaft 92, and the oil collecting hopper 52 is located on the bottom surface of the connecting ring 51. When the first-stage planetary carrier 91 rotates at high speed, the oil is thrown out from the circumferential direction due to the centrifugal force. The oil collecting hopper 52 can just collect the thrown-out oil and let the oil enter the needle bearing 94 through the oil guide sleeve 53 to lubricate and dissipate heat, thereby solving the problem that the oil cannot lubricate the needle bearing near the center of the first-stage planetary carrier due to being thrown out by the centrifugal force, thereby increasing the service life of the needle bearing 2, reducing the internal temperature rise of the reducer, and slowing down the wear of the gears.

[0035] The oil collecting hopper 52 is arranged on the outer periphery of the connecting ring 51 and has a semicircular cross section. The opening of the oil collecting hopper 52 is flush with the inner edge of the connecting ring 51. As shown in the figure, there are four oil collecting hoppers 52, corresponding to the first-stage planetary gears 93. The oil collecting hopper 52 is arranged on the outer periphery of the connecting ring 51. When the first-stage planetary gears and the first-stage planetary carrier rotate, the oil collecting hopper 52 can just collect the oil thrown out from the circumference. The two-stage reducer 2 is arranged horizontally. The oil entering the oil collecting hopper 52 enters the needle bearing 94 through the oil guide sleeve 53 during the high-speed operation of the oil collecting hopper 52 to lubricate and dissipate heat.

[0036] The planetary gear shaft 92 is provided with a radial oil guide hole 921 connected to the needle roller bearing 94, the free end surface of the needle roller bearing 94 is covered with a positioning plate 95, the planetary gear shaft 92 is clamped with a clamp 96 for axially positioning the positioning plate 95, and the positioning plate 95 is provided with an oil hole. The oil in the oil collecting hopper 52 enters the oil guide sleeve 53, enters the needle roller bearing 94 through the radial oil guide hole 921, and lubricates it. The oil in the needle roller bearing 94 flows out from the oil hole on the positioning plate 95, forming a circulation path from the introduction to the export of the oil, lubricating and dissipating the needle roller bearing 94, extending its service life, reducing the internal temperature rise of the reducer, and slowing down the wear of the gears.

[0037] The above is a complete description of the technical solutions of the embodiments of the present invention in conjunction with the accompanying drawings. It should be noted that the described embodiments are only part of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

Claims

1. An integrated electric wheel with cooling function, comprising a hub motor with a cooling water channel, a planetary reducer connected to the rotating shaft of the hub motor, a hub connected to the output end of the planetary reducer, and a brake fixed to the hub, characterized in that: The cooling water channel in the hub motor extends forward to the outer periphery of the planetary reducer to circulate and cool the planetary reducer. The planetary reducer is equipped with an oil guide component that collects the oil thrown out from the circumference and lubricates and dissipates heat for the planetary reducer.

2. The integrated electric wheel with cooling function according to claim 1, characterized in that: The shell of the hub motor includes a rear end cover, a machine base and a front end cover which are fixed in sequence from back to front. A cooling water channel for cooling the hub motor is provided on the machine base, and a water nozzle which is respectively connected to the water inlet and outlet of the cooling water channel is installed on the machine base. The front end cover extends forward to the outer periphery of the planetary reducer, and an annular water channel which is connected to the cooling water channel on the machine base is provided on the front end cover. The annular water channel and the cooling water channel are connected in series to form a circulating water channel.

3. The integrated electric wheel with cooling function according to claim 2, characterized in that: The planetary reducer includes a first-stage planetary reducer connected to the rotating shaft of the hub motor and a second-stage planetary reducer connected to the output end of the first-stage planetary reducer. The ring gear of the first-stage planetary reducer and the ring gear of the second-stage planetary reducer are spline-connected and fixed to the front end cover as the shell of the planetary reducer. The wheel hub is coaxially fixed to the second-stage planetary carrier in the second-stage planetary reducer, and the front end cover extends forward to the outer periphery of the first-stage planetary reducer.

4. The integrated electric wheel with cooling function according to claim 3, characterized in that: A sealing end cover for sealing the oil inside the electric wheel is fixed on the outer end of the secondary planetary frame of the secondary planetary reduction, and a detachable air-permeable plug is arranged at the center of the sealing end cover.

5. The integrated electric wheel with cooling function according to claim 3, characterized in that: The brake comprises a brake disc fixed to the wheel hub and a brake caliper cooperating with the brake disc. The brake caliper is equipped with a brake pad and a piston that pushes the brake pad to move toward the brake disc. The brake caliper comprises a caliper body 1 and a caliper body 2 detachably connected to the caliper body 1. The caliper body 1 is integrally formed with the front end cover, and the caliper body 2 is located at the outer periphery of the wheel hub.

6. The integrated electric wheel with cooling function according to claim 3, characterized in that: The first-stage planet carrier of the first-stage planetary reduction has a hollow planetary gear shaft. The first-stage planetary gear of the first-stage planetary reduction is mounted on the planetary gear shaft through a needle bearing. The oil guide component is mounted on the first-stage planet carrier and connected to the planetary gear shaft to guide the oil into the needle bearing.

7. The integrated electric wheel with cooling function according to claim 6, characterized in that: The oil guide assembly includes a connecting ring, an oil collecting hopper that can collect the oil thrown out from the circumferential direction and corresponds one-to-one with the planetary gear shaft, and an oil guide sleeve that can guide the oil into the needle roller bearing. The connecting ring, the oil collecting hopper and the oil guide sleeve are integrally formed. The oil guide sleeve corresponds one-to-one with the oil collecting hopper and is connected. The oil guide sleeve is pressed into the planetary gear shaft with an interference fit, and the connecting ring rests on the end face of the primary planetary carrier.

8. The integrated electric wheel with cooling function according to claim 7, characterized in that: The oil collecting hopper is arranged on the outer periphery of the connecting ring and has a semicircular cross section. The opening of the oil collecting hopper is flush with the inner edge of the connecting ring.

9. The integrated electric wheel with cooling function according to claim 8, characterized in that: The planetary gear shaft is provided with a radial oil guide hole connected to the needle roller bearing, the free end surface of the needle roller bearing is covered with a positioning plate, the planetary gear shaft is clamped with a clamp for axially positioning the positioning plate, and the positioning plate is provided with an oil hole.

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