EP-3975395-B1 - DISASSEMBLY-FREE MOTOR BEARING DISASSEMBLY AND ASSEMBLY METHOD

EP3975395B1EP 3975395 B1EP3975395 B1EP 3975395B1EP-3975395-B1

Inventors

SHEN, ZHENG
HUANG, Hongchen
YANG, MIN
WANG, JIBIN
TANG, Zimou
HU, Gui
TANG, LIMING
ZENG, Chun
WANG, Yihui
WANG, WEI
HUAI, Xiaoji

Dates

Publication Date: 20260506
Application Date: 20191129

Claims (8)

A disassembly and assembly method for a motor bearing, comprising: inserting axially a plurality of mounting rods (5) into a plurality of mounting holes (101) on an end surface of an end cover, and mounting sequentially a clamping-positioning member (4) and an abutting-positioning member (3) on the plurality of mounting rods (5); pressing against an outer end surface of a rotor rotating shaft (1) by the abutting-positioning member (3) for positioning, and pulling out axially an original bearing assembly (a) mounted on the rotor rotating shaft (1) to between the clamping-positioning member (4) and the abutting-positioning member (3), wherein the clamping-positioning member (4) remains in an initial state, and maintains sufficient sliding space for the original bearing assembly (a) to pass through the clamping-positioning member (4); adjusting the clamping-positioning member (4) to clamp a surface of the rotor rotating shaft (1) for positioning and adjusting the abutting-positioning member (3) to disengage the abutting-positioning member (3) from the outer end surface of the rotor rotating shaft (1), and pulling out axially the original bearing assembly (a) from an outer end of the rotor rotating shaft (1); sliding axially a new bearing assembly (b) from the outer end of the rotor rotating shaft (1) to between the clamping-positioning member (4) and the abutting-positioning member (3), adjusting the abutting-positioning member (3) to press against the outer end surface of the rotor rotating shaft (1) again, and adjusting the clamping-positioning member (4) to loosen the rotor rotating shaft (1); and sliding axially the new bearing assembly (b) to a mounting position on the rotor rotating shaft (1).
The disassembly and assembly method for a motor bearing according to claim 1, wherein before inserting the plurality of mounting rods (5) on the end surface of the end cover, the method further comprises: connecting axially an auxiliary shaft (2) configured to extend an operating space to the outer end of the rotor rotating shaft (1).
The disassembly and assembly method for a motor bearing according to claim 2, wherein the connecting an auxiliary shaft (2) to the outer end of the rotor rotating shaft (1) comprises: defining a threaded hole (102) at an axle center on the outer end surface of the rotor rotating shaft (1), and providing a threaded column at an axle center on an inner end surface of the auxiliary shaft (2) to realize detachable connection between the auxiliary shaft (2) and the rotor rotating shaft (1) via a cooperation of the threaded hole (102) and the threaded column.
The disassembly and assembly method for a motor bearing according to claim 1, wherein the inserting the plurality of mounting rods (5) on the end surface of the end cover comprises: determining 4 to 8 mounting holes (101) on the end surface of the end cover along a circumference with a predetermined radius, inserting axially each of the mounting rods (5) into the corresponding mounting hole (101), and threadedly connecting an end of each of the mounting rods (5) with the corresponding mounting hole (101).
The disassembly and assembly method for a motor bearing according to claim 4, wherein the mounting sequentially a clamping-positioning member (4) and an abutting-positioning member (3) on the plurality of mounting rods (5) comprises: sleeving the clamping-positioning member (4) simultaneously onto the plurality of mounting rods (5), and sliding the clamping-positioning member (4) axially by a predetermined distance to a position corresponding to the surface of the rotor rotating shaft (1); sleeving the abutting-positioning member (3) simultaneously onto the plurality of mounting rods (5), and sliding the abutting-positioning member (3) axially to ends of the plurality of mounting rods (5) and keeping a surface of the abutting-positioning member (3) abutting against the outer end surface of the rotor rotating shaft (1); and fixing the abutting-positioning member (3) at a current position via fasteners (6) at the ends of the plurality of mounting rods (5).
The disassembly and assembly method for a motor bearing according to claim 1, wherein when the clamping-positioning member (4) is adjusted, a clamping radius of the clamping-positioning member (4) is adjusted to clamp or loose the surface of the rotor rotating shaft (1); and when the abutting-positioning member (3) is adjusted, a sliding distance of the abutting-positioning member (3) on the plurality of mounting rods (5) is adjusted to press the abutting-positioning member (3) against or disengage the abutting-positioning member (3) from the outer end surface of the rotor rotating shaft (1).
The disassembly and assembly method for a motor bearing according to claim 1, wherein when the original bearing assembly (a) is pulled out or the new bearing assembly (b) is slid in, a force is applied axially to an outer end surface of the original bearing assembly (a) or the new bearing assembly (b) by a drive system.
The disassembly and assembly method for a motor bearing according to claim 7, wherein after sliding axially the new bearing assembly (b) to a mounting position on the rotor rotating shaft (1), the method further comprises: adjusting the abutting-positioning member (3) to disengage the abutting-positioning member (3) from the outer end surface of the rotor rotating shaft (1); sliding sequentially the abutting-positioning member (3) and the clamping-positioning member (4) out from the plurality of mounting rods (5); and removing the plurality of mounting rods (5) from the plurality of mounting holes (101).

Description

The present application claims the priority of Chinese Patent Application No. 201911114011.1, titled "DISASSEMBLY-FREE MOTOR BEARING DISASSEMBLY AND ASSEMBLY METHOD", filed with the Chinese Patent Office on November 14, 2019. FIELD The present application relates to the technical field of motors, and in particular to a disassembly-free disassembly and assembly method for a motor bearing. BACKGROUND With the rapid development of rail transportation, the operation and maintenance requirements and technical level of rail vehicles are increasing day by day. A traction motor is generally used for power drive in a trunk railway electric locomotive, an industrial and mining electric locomotive, an electric drive diesel locomotive and various electric vehicles. The traction motor mainly includes a rotor and a stator, the operating principle of which is the same as the operating principle of an ordinary motor. In order to ensure the smooth rotation of the rotor, a bearing is mounted on the rotor. The working status and maintenance requirements of components in the vehicle vary, and the bearing of the rotor is a core stressed member. In order to ensure the safe operation of the vehicle, the maintenance of the bearing is extremely critical, and the bearing must be tested or replaced within a specified time period or kilometers. The structural arrangement of the conventional traction motor results in that the motor must be first disassembled to separate the stator from the rotor, and then the bearing is pulled out from a bearing chamber to complete the detection or replacement work. The common practice in the conventional technology is to unload the motor and deliver it back to the manufacture, and then the motor is disassembled with a special tool, the stator is separated from the rotor, and then the bearing is pulled out for detection or replacement. The entire disassembly cycle is long, the process is cumbersome, a specific site and special tooling are required, and the maintenance cost and maintenance resource consumption are large. Especially when the faulty bearing needs to be disassembled, the above process cannot be simplified, which results in a large time span for fault analysis and solution, and is not conducive to the rapid solution of the problem and the reduction of economic losses caused by the fault. When the existing motor bearing is repaired and replaced, the motor generally needs to be disassembled, the rotor of the motor is pulled out of the motor, and then the bearing is pulled out with a specific device, and finally a new bearing is remounted on a rotating shaft through tooling, the rotor is put back into the motor, and the motor is remounted. The entire replacement process is complex and time-consuming. In addition, in the process of disassembling and reassembling the motor, it is difficult to accurately reset the rotor rotating shaft to an axle center, which has a risk of motor damage caused by human operation error, and lays a hidden quality risk for the safe operation of the motor. Therefore, how to realize the disassembly-free disassembly and replacement of the motor bearing, improve the efficiency of the disassembly and replacement, and avoid the displacement of the rotor during the disassembly and replacement, is a technical problem faced by those skilled in the art. JP2014185679A discloses a bearing removing method, a bearing replacing method, a jig for bearing replacement and a wave power generation device. There are provided: a step of coupling a jig for bearing replacement to a shaft end of a flywheel which is rotatably supported by a bearing in a gimbal casing; a step of removing the bearing and moving the same to the jig for bearing replacement; a step of disposing a support member between the gimbal casing and the flywheel in place of the bearing; and a step of releasing the coupling of the jig for bearing replacement to the flywheel. JP2013223390A discloses a method for replacing bearing part of rotary electric machine and a replacement holder thereof, a joining shaft is fixed to an end part of a rotating shaft part of a rotary electric machine, a first holder for supporting the joining shaft is fixed to a bearing bracket to remove a bearing assembly from the bearing bracket, a second holder for supporting the rotating shaft with the bearing assembly removed is then fixed to the bearing bracket to remove the bearing assembly and the first holder, and after that a new bearing assembly is inserted between the bearing bracket and the rotating shaft. CN104377913A discloses a disassembling structure and a method enabling a generator bearing to be replaced on site. The structure comprises a temporary support, a split type annular sizing block and a generator with a bearing capable of being disassembled. The generator with the bearing capable of being disassembled comprises a generator end cover, a main shaft, the bearing and a bearing seat. The main shaft is in interference fit with the b