WO2011050656A1

WO2011050656A1 - Elastic piece for adjusting axial gap of motor

Info

Publication number: WO2011050656A1
Application number: PCT/CN2010/076685
Authority: WO
Inventors: 夏斐; 黄荣和
Original assignee: 上海博泽电机有限公司
Priority date: 2009-10-30
Filing date: 2010-09-07
Publication date: 2011-05-05
Also published as: CN101697432A; CN101697432B

Abstract

An elastic piece (10) for adjusting an axial gap of a motor is laid on an end of a motor driving shaft (60). An end surface (12) of the elastic piece (10) is propped against an inner wall of the motor, and the other end surface (11) is propped against a shaft end pad (20) sheathed on the motor driving shaft (60). The end surface (12) where the elastic piece (10) is propped against the inner wall of the motor and the other end surface (11) where the elastic piece (10) is propped against the shaft end pad (20) are planar surfaces. The elastic piece (10) is provided with a lateral surface (13) connected with the two end surfaces. The lateral surface (13) is a cambered surface. The elastic piece (10) can compensate for a gap due to the assembly in a range of a certain force, and especially the axial gap adjustment in the motor is realized with the adaption of the shaft end pad (20). The elastic piece (10) has the advantages of a small size, a wide compensation range, gapless assembly, a simple structure suitable for the mass production. In addition, due to the reasonable section structure of the elastic piece (10), the elasticity of the elastic piece (10) varies approximately linearly, thus noise is reduced.

Description

Elastic member for axial clearance adjustment of motor

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to an elastic member, and more particularly to an elastic member for adjusting axial clearance of a motor with a shaft end spacer. Background technique

At present, adjusting the axial clearance of the motor can be achieved by two methods: inelastic control and elastic member control.

Inelastic control, as shown in Figure 4, is to adjust the axial clearance of the motor through the shaft end gaskets of different thicknesses. The disadvantages are: A certain number of shaft end gaskets with different thickness specifications are required, because the thickness specification is directly graded. Determine the axial clearance adjustment accuracy, the assembly needs to cooperate with the axial clearance pre-test and then select different specifications of the shaft end gasket; the number of parts is large, the precision is high, the assembly is complicated, the cost is high; due to the inelastic compensation, the axial direction still has a small range The gap, and the shaft end gasket wears with the motor running, the gap will increase, and thus the motor still has axial turbulence during operation, causing motor running noise.

Elastic parts control, including useful steel wave springs to compensate the shaft end gasket control axial sway, as shown in Figure 5; but its parts have high precision, different elastic coefficients require different size parts, need appropriate heat treatment to ensure corresponding The elasticity requirement, the stability of the parts is not easy to guarantee, the elasticity of the parts is kept low, and the impact is low. In addition, the rubber parts are used as elastic parts to compensate the axial end gasket to control the axial movement. As shown in Fig. 6, the material is NBR (Ning Qing Rubber), a cylindrical elastic member 71 having a rectangular cross section, a circular elastic member 72 having a rectangular cross section, and a circular elastic member 73 having a circular cross section. However, the material NBR has poor elastic properties, is resistant to aging, and has insufficient life; The elasticity of the circular elastic member 73 having a circular cross section is a nonlinear change, which is disadvantageous to the smoothness of the turbulent change in the axial operation; and the cylindrical elastic member 71 having a rectangular cross section and the circular elastic member 72 having a rectangular cross section are Partial sharp edges are prone to stress concentration during impact and cause damage. Summary of the invention

In view of the above-mentioned deficiencies of the existing elastic members, the technical problem to be solved is to provide an elastic member which has a simple structure, a long elastic life, and a large compensation range.

In order to solve the above technical problem, the present invention provides an elastic member for adjusting the axial gap of a motor, which is disposed at the end of the motor drive shaft, one end face abuts against the inner wall of the motor, and the other end face abuts against the motor drive shaft. The upper end spacer, the end surface of the elastic member abutting against the inner wall of the motor and the shaft end pad The other end surface of the elastic plate is a circular arc surface; the elastic member is annular or round;

The elastic member for axial gap adjustment of the motor is made of silicone rubber.

The elastic member for axial gap adjustment of the motor has small size, realizes large compensation range, can realize gapless assembly, and has simple structure and easy to quantify production; suitable use of the material is beneficial to use in different environments, high resistance , low temperature, aging resistance, long life with elasticity; different hardness of rubber materials can be selected under the same size to achieve different elastic performance requirements; in addition, using its reasonable cross-sectional structure, the elastic type of the invention can be linearly changed. The turbulence of the shaft is smoothed by the axial force and reduces noise.

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

1 is a schematic structural view of a first preferred embodiment of the present invention;

2 is a schematic structural view of a second preferred embodiment of the present invention;

Figure 3 is a cross-sectional view showing the use of a cap-shaped shaft end gasket of the present invention;

Figure 4 is a prior art inelastic shaft end gasket;

Figure 5 is a conventional steel spring;

Figure 6 is a conventional elastic member;

Figure 7 is a diagram showing the force variation of the elastic member under different cross-section structures;

Figure 8 is a cross-sectional view showing the use of the mating motor of the present invention. detailed description

The elastic member for adjusting the axial gap of the motor of the present invention is an elastic component, which can compensate the gap generated by the assembly within a certain force range, in particular, a matching shaft end gasket is used for the motor axial direction. Clearance-adjusted elastic parts.

The annular elastic member 10 of the first preferred embodiment of the present invention is shown in FIG. 8. The shaft end spacer 20 is disposed on the end of the motor drive shaft 60 for adjusting the axial clearance of the motor drive shaft; As shown in FIG. 1, one end surface 12 of the annular elastic member 10 of the present invention abuts against the inner wall of the motor, and the other end surface 11 is sleeved on the shaft end spacer 20 of the motor drive shaft 60. The elastic member 10 Both end faces 11, 12 are flat, and the side faces 13 connecting the end faces are arc faces;

Similarly, in the second preferred embodiment of the present invention, the disc-shaped elastic member 10' is as shown in Fig. 2, and an end surface 12' which is in contact with the inner wall of the motor is a flat surface, and the other end surface 1 which is in contact with the shaft end spacer is Γ also Plane, and the side 13' connecting the end faces 1 Γ and 12' is a circular arc surface;

The difference between the first preferred embodiment of the present invention and the second preferred embodiment is that the central portion of the elastic member 10 is a hollow ring, and the elastic member 10 is a solid round cake at the center of the circle, and the shapes of the two can be matched. Different shaft end gaskets are used. The common points of the elastic members 10 and 10' are that the contact surfaces of the elastic member with the inner wall of the motor and the shaft end gasket are flat, and the side surfaces connecting the end faces of the two planes are circular arc surfaces; The elastic member of the present invention is made of silicone rubber, and different elastic strengths of the rubber material can be used in the same size to achieve different elastic modulus requirements.

As shown in FIG. 3, the elastic member 10 of the first preferred embodiment of the present invention can be used in combination with a cap-shaped shaft end spacer 20 having a hat-like shape including a cylindrical portion 24 having a closed axial end and an axial end of the other opening, a cap-shaped flange extending radially outward from the open axial end of the cylindrical portion 23, and a cylindrical end portion 21 extending in the axial direction outwardly at the center of the outer surface of the closed axial end portion of the cylindrical portion 24, the cylindrical portion 24 and the brim flange 23 having a passage 22 in the center thereof For the insertion of the motor drive shaft 60 as shown in FIG. 8; the cap-shaped shaft end washer 20 is made of polyamide 46 (ie, PA46), and the strength and wear resistance thereof provide the shaft end washer to the motor drive. Supporting the shaft end and lubricating function; as shown in FIG. 8 , the cap-shaped shaft end washer 20 is locked in the motor and sleeved on the end of the motor drive shaft 60 , and the shaft end protrusion 21 is in contact with the inner wall of the motor. The annular elastic member 10 is sleeved on the axial end of the cap-shaped shaft end spacer 20 On the starting portion 21, one end surface abuts against the inner wall of the motor, and the other end surface 4 abuts the cap-shaped shaft end spacer 20. When the motor transmission shaft 60 is driven, the shaft end projection portion 21 is the main force point, because it bears Most of the force is applied to prevent the elastic member 10 from being deformed beyond the range; at the same time, the elastic member 10 is sleeved on the shaft end projection 21 to buffer the force transmitted to the shaft end projection 21, and The gap generated by the assembly is compensated within a certain force range, and the gap due to the loss of the shaft end projection portion 21 is compensated.

As shown in FIG. 7, the straight line 30 indicates that the elasticity of the elastic member is in a state of ideal linear change, and the force is stable, but it is an ideal state, which cannot be realized in reality; in the prior art, the force receiving surface of the elastic member is a circular arc surface. When the pressure is under pressure, the elasticity is a non-linear curve 50, the axial force of the shaft changes unsteadily, and the shaft sway is strong and noisy; and the present invention contacts the elastic members 10, 10 with the inner wall of the motor and the shaft end gasket. The two end faces are arranged in a plane, and at this time, the elastic members 10, 10 are elasticized to produce a linear change as indicated by the curve 40, so that the axial force variation tends to be smooth, thereby reducing the turbulence caused by the motor drive shaft 60. And the noise caused. Further, the present invention sets the side faces 13, 13 connecting the both end faces to a circular arc surface, thereby avoiding stress concentration caused by the local sharp edges and causing damage.

The elastic member for adjusting the axial gap of the motor of the present invention, whether annular or round, It can be used with the circular or square shaft end gasket of the current general shape, and the annular elastic member can be used together with the cap-shaped shaft end gasket as shown in FIG. The axial gap adjustment function; the contact surface of the elastic member of the present invention and the inner wall of the motor and the shaft end spacer are both planar, and the side surface connecting the end faces of the two planes is a circular arc surface, and the shape of the elastic member is not specifically limited.

Claims

Claim

1. An elastic member for adjusting axial gap of a motor, which is disposed at an end of a motor drive shaft, one end of which abuts against an inner wall of the motor, and the other end abuts against a shaft end gasket sleeved on a motor drive shaft, The end surface of the elastic member that abuts against the inner wall of the motor and the other end surface that abuts the shaft end gasket are planar, and the side surface of the elastic member that connects the end faces is a circular arc surface.

2. The elastic member for axial gap adjustment of a motor according to claim 1, wherein the elastic member is annular.

3. The elastic member for axial gap adjustment of a motor according to claim 1, wherein the elastic member is in the shape of a pie.

4. The elastic member for axial gap adjustment of a motor according to claim 1, wherein the elastic member is made of silicone rubber.