CN107565777B

CN107565777B - Rotor installation tool of permanent magnet motor

Info

Publication number: CN107565777B
Application number: CN201711030642.6A
Authority: CN
Inventors: 周亦骏; 吴立华; 董继勇
Original assignee: Nanjing Cigu Technology Co Ltd
Current assignee: Nanjing Cigu Technology Co Ltd
Priority date: 2017-10-30
Filing date: 2017-10-30
Publication date: 2023-05-30
Anticipated expiration: 2037-10-30
Also published as: CN107565777A

Abstract

The invention discloses a rotor mounting tool of a permanent magnet motor, which is used for mounting a rotor in a lower bearing of the permanent magnet motor and comprises an extension shaft, a base, a dismounting sleeve, a driving plate and a limiting block, wherein the base is fixedly connected with a lower end cover in the permanent magnet motor; the invention achieves the positioning of the rotor and the inner ring of the lower bearing through a set of tool, and provides the traction force required by the rotor assembly.

Description

Rotor installation tool of permanent magnet motor

Technical field:

the invention relates to a rotor mounting tool of a permanent magnet motor.

The background technology is as follows:

when the permanent magnet motor is mounted with the rotor, the positioning problem of the rotor and the bearing inner ring (the upper bearing 400 and the lower bearing 500) is often troublesome due to the attraction of the rotor 200 and the stator 300, and once the rotor 200 collides with the bearing inner ring (or is forcibly assembled on the premise of inaccurate centering), the bearing may be damaged, especially for the angular contact bearing.

For easy installation, the existing assembly scheme is to assemble the rotor and the bearing at one end in place, and then install the bearing at the other end. Namely:

1) Before the rotor 200 is inserted into the stator 300, the rotor 200, the upper bearing 400, the upper bearing seat and the upper end cover are assembled and fixed, so that the rotor 200 and the upper bearing 400 cannot generate relative motion; 2) Then, the lower bearing 500, the lower end cap 600, and the lower bearing housing are assembled to the motor housing. 3) The assembled rotor 200, upper bearing 400, upper bearing housing and motor upper end cap components of 1) are then lifted, and the rotor 200 is passed through the stator 300 to complete the assembly with the lower bearing 500, as shown in fig. 1. Because the assembly of the rotor 200 and the upper and lower bearings has high requirements on positioning accuracy, the three-step installation method can avoid the condition that the bearings at two ends need to be positioned accurately at the same time.

However, when the rotor is assembled in the above manner, the following problems are inevitably encountered: 1) problem of positioning of the rotor 200 and the lower bearing 500, 2) because the rotor 200 and the lower bearing 500 must be in a small interference fit relationship when the rotor 200 is positioned into the lower bearing 500, the friction resistance of the assembly process needs to be overcome, and 3) the rotor 200 and the lower bearing 500 cannot exceed the limit after reaching the correct assembly position. Therefore, a tooling is needed to solve the above three problems, and to accurately assemble the rotor 200 into the lower bearing 500.

The invention comprises the following steps:

the invention provides a rotor mounting tool of a permanent magnet motor for solving the problems in the prior art.

The invention adopts the technical scheme that: the utility model provides a rotor installation frock of permanent magnet motor, this frock is used for installing the rotor in the lower bearing of permanent magnet motor, including extension axle, base, dismantlement cover, drive plate and stopper, the base with the lower extreme cover fixed connection in the permanent magnet motor, the top of extension axle and the rotor threaded connection of permanent magnet motor, the bottom of extension axle runs through in the base along the axle center direction of base, dismantlement cover threaded connection is on the base, the drive plate is fixed in dismantlement cover's lower terminal surface, and the one end joint of drive plate is on the extension axle, the stopper is fixed in dismantlement cover's up end, and the one end of stopper stretches on the base outer wall, rotatory dismantlement cover, the drive plate drives the extension axle downwards, the extension axle pulls the rotor downwards, and install the rotor in the lower bearing;

the extension shaft comprises a shaft body, a threaded connection part and a frustum part with a small end face and a large end face, wherein the left end of the shaft body is fixedly connected with the small end face of the frustum part, and the threaded connection part is fixedly connected with the center of the large end face of the frustum part.

Further, the diameter of the small end surface of the frustum portion is larger than or equal to the diameter of the shaft body.

Further, a first clamping groove for clamping the driving plate is formed in the shaft body.

Further, the driving plate comprises two semicircular plate bodies, and a second clamping groove is formed in the center of each plate body.

Further, a limiting groove is formed in the outer circumferential wall of the base.

Further, the limiting block comprises a body in a shape, the upper end and the lower end of the body are bent by 90 degrees along opposite directions, the upper end of the body forms a limiting edge, the lower end of the body forms a connecting edge, and the limiting edge extends into the limiting groove.

Further, the upper end face of the base is provided with a boss portion.

Further, a rotary handle is welded on the outer wall of the disassembly sleeve.

The invention has the following beneficial effects:

1) The collision caused by the mutual attraction of the rotor and the stator in the assembly process is prevented. Because of the small clearance fit between the base and the extension shaft, the extension shaft can slide freely axially in the base, but cannot deviate greatly in the radial direction, so that the collision between the rotor and the stator is prevented.

2) The rotor and the lower bearing can be guided to complete positioning. Because there is certain tapering (frustum portion) in the one end that extension axle and rotor are connected, and the size of the big terminal surface of frustum portion is greater than the axis body, slightly is less than the size of rotor bearing end, and though the axis body size is less than lower bearing inner circle, can not realize the centering requirement, but can guide the rotor to lower bearing center in order to realize the centering demand gradually through the frustum portion on the extension axle. The dimension slightly smaller than the bearing end of the rotor is due to a certain positioning error between the extension shaft and the rotor, and the taper of the upper frustum part of the extension shaft is matched with the chamfer of the end part of the rotor to sufficiently guide the rotor to enter the lower bearing.

3) After the pilot rotor is centered with the lower bearing, sufficient traction can be provided for the rotor to be assembled in place. After the rotor is accurately centered with the lower bearing, frictional resistance generated by interference fit needs to be overcome, and at the moment, the threads between the dismounting sleeve and the base can efficiently transfer the dragging force required by overcoming the frictional force. Thereby avoiding damage to the bearing caused by knocking the rotor.

Description of the drawings:

fig. 1 is a schematic diagram showing the assembly of a rotor with upper and lower bearings in the prior art.

Fig. 2 and 3 are structural diagrams of the installation fixture of the present invention for assembling a rotor on a lower bearing.

Fig. 4 is a block diagram of an extension shaft in the present invention.

Fig. 5 is a structural view of a driving plate in the present invention.

Fig. 6 is a block diagram of the stopper in the present invention.

Fig. 7 is a structural view of a base in the present invention.

The specific embodiment is as follows:

the invention is further described below with reference to the accompanying drawings.

As shown in fig. 2 and 3, the invention discloses a rotor mounting tool for a permanent magnet motor, which is used for mounting a rotor 200 in a lower bearing 500 of the permanent magnet motor, and comprises an extension shaft 1, a base 2, a dismounting sleeve 3, a driving plate 4 and a limiting block 5, wherein the base 2 is fixedly connected with a lower end cover 600 in the permanent magnet motor through screws, the top end of the extension shaft 1 is in threaded connection with the lower end surface of the rotor 200, the bottom end of the extension shaft 1 penetrates through the base 2 along the axial direction of the base 2, the dismounting sleeve 3 is in threaded connection with the base 2, the driving plate 4 is fixed on the lower end surface of the dismounting sleeve 3, one end of the driving plate 4 is clamped on the extension shaft 1, the limiting block 5 is fixed on the upper end surface of the dismounting sleeve 3, and one end of the limiting block 5 extends on the outer wall of the base 2.

As shown in fig. 4, the extension shaft 1 includes a shaft body 11, a threaded connection portion 12, and a frustum portion 13 having a small end face and a large end face, wherein the left end of the shaft body 11 is fixedly connected with the small end face of the frustum portion 13, and the threaded connection portion 12 is fixedly connected at the center of the large end face in the frustum portion 13.

The diameter of the large end surface in the frustum portion 13 is slightly smaller than the diameter of the bottom surface (i.e., rotor bearing end) of the rotor 200; the diameter of the small end surface of the frustum portion 13 is larger than or equal to the diameter of the shaft body 11.

The shaft 11 is provided with a first clamping groove 14 for clamping the driving plate 4, and the driving plate 4 is clamped in the first clamping groove 14.

As shown in fig. 5, the driving plate 4 includes two semicircular plate bodies 41, a second clamping groove 42 is disposed at the center of the plate body 41, the second clamping groove 42 is clamped in the first clamping groove 14, and the second clamping groove 42 is in clearance fit with the first clamping groove 14.

A limit groove 21 is formed in the outer circumferential wall of the base 2, and the limit groove 21 is matched with the limit block 5, so as to limit the movement travel of the extension shaft 1, and further, the rotor 200 is accurately assembled into the lower bearing 500.

As shown in fig. 6, the limiting block 5 includes a body 51 with a shape, the upper and lower ends of the body 51 are bent by 90 ° along opposite directions, the upper end forms a limiting edge 53, the lower end forms a connecting edge 52, and the limiting edge 53 extends into the limiting groove 21.

As shown in fig. 7, in order to facilitate the limitation of the lower bearing 500, a boss portion 22 is provided on the upper end surface of the base 2.

In order to facilitate the rotation of the disassembly sleeve 3, a rotation handle 31 is welded on the outer wall of the rotation disassembly sleeve 3.

When in use, the base 2 is fixed on the lower end cover 600, the boss part 22 on the base 2 is abutted against the inner ring of the lower bearing 500, the extension shaft 1 is in threaded connection with the bottom surface of the rotor 200, the frustum part 13 of the extension shaft 1 is arranged in the lower bearing 500, the limiting block 5 is pushed to the topmost end of the limiting groove 21, then the connecting driving plate 4 is fixed on the lower end surface of the dismounting sleeve 3, and the driving plate 4 is clamped in the first clamping groove 14 of the extension shaft 1. Rotating the rotary handle 31 causes the removal sleeve 3 to drive the extension shaft 1, guiding the rotor 200 to continue to move downwards. The boss portion 22 on the base 2 abuts against the inner ring of the lower bearing 500, so that the outer ring of the lower bearing 500 is prevented from bearing downward force during the assembly process, and damage to the lower bearing is prevented.

The disassembly sleeve 3 rotates on the base 2 to effectively transfer downward force, so that the rotor 200 moves downwards against resistance; the frustum portion 13 on the extension shaft 1 can guide the rotor 200 to complete centering with the inner ring of the lower bearing 500, and since the size of the large end surface of the frustum portion 13 is slightly smaller than the size of the inner ring of the bearing, the frustum portion 13 itself does not generate additional assembly resistance. The limit block 5 and the limit groove 21 are matched to prevent the rotor 200 from crushing the inner ring of the lower bearing 500 after being assembled in place.

When the limiting block 5 runs out of the stroke, namely the rotor 200 is assembled in place, the driving plate 4, the dismounting sleeve 3, the limiting block 5 and the base 2 are dismounted in sequence, finally the extension shaft 1 is dismounted, and the rotor is mounted by mounting the bearing seat end cover.

The foregoing is merely a preferred embodiment of the invention, and it should be noted that modifications could be made by those skilled in the art without departing from the principles of the invention, which modifications would also be considered to be within the scope of the invention.

Claims

1. The utility model provides a permanent magnet machine's rotor installation frock, this frock is used for with the rotor is installed in permanent magnet machine's lower bearing, its characterized in that: the permanent magnet motor rotor comprises an extension shaft (1), a base (2), a disassembly sleeve (3), a driving plate (4) and a limiting block (5), wherein the base (2) is fixedly connected with a lower end cover in the permanent magnet motor, the top end of the extension shaft (1) is in threaded connection with a rotor of the permanent magnet motor, the bottom end of the extension shaft (1) penetrates through the base (2) along the axis direction of the base (2), the disassembly sleeve (3) is in threaded connection with the base (2), the driving plate (4) is fixed on the lower end face of the disassembly sleeve (3), one end of the driving plate (4) is clamped on the extension shaft (1), the limiting block (5) is fixed on the upper end face of the disassembly sleeve (3), one end of the limiting block (5) extends on the outer wall of the base (2), the driving plate (4) drives the extension shaft (1) downwards, the extension shaft (1) downwards pulls the rotor, and the rotor is installed in the lower bearing.

The extension shaft (1) comprises a shaft body (11), a threaded connection part (12) and a frustum portion (13) with a small end face and a large end face, the left end of the shaft body (11) is fixedly connected with the small end face of the frustum portion (13), and the threaded connection part (12) is fixedly connected with the center of the large end face in the frustum portion (13).

2. The rotor and lower bearing mounting fixture for use in a permanent magnet motor of claim 1, wherein: the diameter of the small end surface of the frustum portion (13) is larger than or equal to the diameter of the shaft body (11).

3. The rotor and lower bearing mounting fixture for use in a permanent magnet motor of claim 1, wherein: the shaft body (11) is provided with a first clamping groove (14) for clamping the driving plate (4).

4. The rotor and lower bearing mounting fixture for use in a permanent magnet motor of claim 1, wherein: the driving plate (4) comprises two semicircular plate bodies (41), and a second clamping groove (42) is formed in the center of each plate body (41).

5. The rotor and lower bearing mounting fixture for use in a permanent magnet motor of claim 1, wherein: and a limiting groove (21) is formed in the outer circumferential wall of the base (2).

6. The rotor and lower bearing mounting fixture for use in a permanent magnet motor of claim 5, wherein: the limiting block (5) comprises a body (51) in a shape, the upper end and the lower end of the body (51) are bent by 90 degrees along opposite directions, the upper end of the body forms a limiting edge (53), the lower end of the body forms a connecting edge (52), and the limiting edge (53) extends into the limiting groove (21).

7. The rotor and lower bearing mounting fixture for use in a permanent magnet motor of claim 1, wherein: the upper end face of the base (2) is provided with a boss part (22).

8. The rotor and lower bearing mounting fixture for use in a permanent magnet motor of claim 1, wherein: the outer wall of the disassembly sleeve (3) is welded with a rotary handle (31).