KR200154125Y1 - Spring for a bearing pre-load - Google Patents

Abstract

The present invention relates to a spring for bearing preload, wherein a preload spring for preloading a bearing is interposed between a bearing support and a bearing housed therein, and the contact area of the preload spring can be increased with respect to the bearing and the bearing support at the outer edge of the preload spring. By providing a contact area increase part, it is possible to apply a uniform preload to the whole bearing surface, thereby reducing the dispersion of the product characteristics, and in particular, to increase the rigidity of the bearing to reduce the vibration and noise generated when the rotor rotates. As a result, the bearing performance and life can be extended.

Description

Spring for bearing preload

The present invention relates to a spring for preloading a bearing to apply a pre-load to increase the rigidity of the bearing. More specifically, a bearing for preloading to increase the contact area to uniformly apply the preload to the entire bearing surface. It's about the spring.

In general, the rotating shafts of various rotating bodies such as motors are supported by bearings. These bearings are one of the important parts that determine the performance and life of the motor. High stiffness is required to reduce vibration and noise, and a preload spring presses a load on the bearing to prevent wear during operation of the motor. do.

1 is a view illustrating a bearing support of a motor, in which a rotating shaft 10 is inserted into a central portion of a rotor (not shown) rotatably inserted into a stator, and one end of the rotating shaft 10 smoothly rotates the rotor. The bearing 12 is press-fitted and fixed to rotate the bearing 12, and the bearing 12 is accommodated in the bearing support 16 integrally formed under the motor housing 14.

A preload spring 18 is interposed between the bearing 12 and the bearing support 16 to preload the bearing 12, as shown in FIG. 2. The preload spring 18 is annular and has three to four circumferential directions. The peaks 18a and the valleys 18b are repeatedly formed so that their shape is wavy and elastic in the plane direction. Then, the corrugated peak 18a portion formed in the preload spring 18 is in surface contact with the outer ring of the bearing 12 at the lower portion, and the corrugated valley 18b portion is in surface contact with the bottom surface of the bearing support 16. .

The conventional bearing preloading spring configured as described above is press-fitted and fixed to the bearing 12 at one end of the rotary shaft 10 pressed into the rotor, and then sequentially inserts the preload spring 18 and the bearing 12 into the bearing support 16. do. At this time, the preload spring 18 is the bearing 12 outer ring and the bearing support 16 bottom by the pressing force of the bearing 12 into which the corrugated peaks 18a and valleys 18b are inserted into the bearing support 16. By pressing on the surface to retain the elasticity stretched in the direction of the center of the rotation axis 10, and the preload corresponding to this elasticity acts in the axial direction with respect to the bearing 12, thereby minimizing the vibration and noise generated during operation of the motor to a minimum will be.

However, it is difficult to fabricate the peaks and valleys formed in the preload springs for preloading the bearings with the correct waveforms, and the defect rate of the product is high as well as the poor preload due to the irregular spacing of the peaks and valleys of the waveforms or their height difference. When the spring is inserted into the bearing support, not only the entire bearing surface, that is, the bearing outer ring cannot be preloaded uniformly, but also there is a problem in that dispersion due to non-uniformity of preload amount occurs, thereby degrading the performance and life of the bearing.

The present invention is to solve the above problems, an object of the present invention is to provide a bearing preload spring with an increased contact area to apply a uniform preload to the bearing.

Another object of the present invention is to provide a spring for preloading bearings by applying a uniform preload to the entire bearing surface to reduce dispersion and extend the performance and life of the bearing.

1 is a partially separated perspective view showing a conventional bearing preloading spring with a bearing support of a motor;

2 is a cross-sectional view of a state in which a preloading spring is interposed between the bearing support shown in FIG. 1;

Figure 3a is a perspective view showing a spring for bearing preload according to the present invention,

3B is a cross-sectional view of the spring for preload shown in FIG. 3A,

Figure 4 is a cross-sectional view showing a state in which the bearing preloading spring according to the present invention is interposed in the bearing support of the motor.

Explanation of symbols on the main parts of the drawings

10: rotating shaft 12: bearing

14 motor housing 16 bearing support

30: preload spring 32: spring body

32a: Mountain 32b: Goal

34,36: upper and lower contact

A feature of the present invention for achieving the above object is, in the bearing support for receiving the bearing and the bearing pre-loading spring interposed to support the bearing is inserted into the bearing support portion, the bearing support to the bearing A preload spring is provided for preloading and a contact area enlargement is provided at the outer edge of the preload spring to increase the contact area with which the preload spring is in contact with the bearing and bearing support.

The preload spring according to the preferred embodiment of the present invention is achieved by having an annular spring body in which a peak and a valley are repeatedly formed to form a wave shape.

The contact area increase part according to a preferred embodiment of the present invention is achieved by being provided with upper and lower contact portions which are bent upward and downward with respect to the hill and the valley formed in the spring body, respectively.

Hereinafter, a preferred embodiment of a bearing preload spring according to the present invention will be described in detail with reference to the accompanying drawings.

3A, 3B, and 4 are views illustrating a spring for preload according to the present invention, and for the convenience of description, the same reference numerals are used for the same parts as the above-described drawings.

A bearing 12 is fitted at one end of the rotating shaft 10 fitted to the center of the rotor, and the bearing 12 is accommodated in the bearing support 16 formed integrally under the motor housing 14, and the bearing 12 and the bearing are Between the supports 16 is interposed a preload spring 30 as in FIGS. 3A and 3B to preload the bearing 12.

The preload spring 30 is formed repeatedly in the annular spring body 32 and the spring body 32 such that the peaks 32a and valleys 32b and the peaks 32a of which the shape of the preload spring 30 is corrugated. And a contact area enlargement portion provided at an outer edge of the valley 32b, wherein the contact area increase portion is bent upward with respect to the corrugated peak, and the upper contact portion 34 and the bearing support portion which are in surface contact with the outer ring of the bearing 12. 16 is provided with a lower contact portion 36 bent downward with respect to the valley 32b to be in surface contact with the bottom surface of the 16.

Referring to the action of the spring for bearing preload according to the present invention configured as described above in detail.

When the spring body 32 is inserted into the bearing support 16 of the motor housing 14 and then the bearing 12 is inserted above the spring body 32, the spring body 32 is driven by the pressing force of the bearing 12. While being pressed to retain elasticity that can be stretched in the axial direction, the preload corresponding to the elasticity acts on the bearing 12 in which the rotary shaft 10 is fitted.

That is, the lower contact portion 36 bent downward on the outer edge of the valley 32b formed in the spring body 32 is in wide contact with the bottom surface of the bearing support 16, and the peak 32a of the waveform The upwardly bent upper contact portion 34 has a wide range of surface contact with the outer ring of the bearing 12, and the outer ring of the inner ring 12 of the bearing 12 is displaced as the outer ring of the bearing 12 is displaced upward. ball) (not shown) Since the outer circumferential surface and the outer ring and the inner ring of the bearing 12 are respectively in surface contact, the flow of the ball is suppressed during rotation of the rotor, thereby reducing vibration and noise.

The preload spring 30 according to the present invention has an increased contact area in contact with the bearing 12 so that the preload is uniformly applied to the entire outer surface of the bearing even if the height of the peak 32a formed in the spring body 32 is not constant. This minimizes the distribution of product characteristics.

As described above, according to the spring for bearing preload according to the present invention, by the preload spring having an increased contact area between the bearing and the bearing support portion, it is possible to apply a uniform preload to the entire bearing surface, thereby resulting in dispersion of product characteristics. In particular, by increasing the rigidity of the bearing to reduce the vibration and noise generated during the rotation of the rotor can improve the bearing performance and extend the life.

The present invention is not limited to the above-described specific preferred embodiments, and any person having ordinary skill in the art to which the present invention pertains may make various modifications without departing from the gist of the present invention claimed in the claims. Of course, such changes will fall within the scope of the claims.

Claims (3)

In the bearing support portion in which the bearing is accommodated and the bearing preload spring interposed to support the bearing to be inserted into the bearing support portion, The bearing support portion is provided with a preload spring for preloading the bearing, and the contact area increase portion is provided at the outer edge of the preload spring to increase the contact area where the preload spring is in contact with the bearing and the bearing support. Spring for bearing preload. The bearing preload spring according to claim 1, wherein the preload spring is formed as an annular spring body having a peak and a valley repeatedly formed to form a wave shape. According to claim 1, wherein the contact area increase portion is bent upwardly with respect to the mountain provided with an upper contact portion which is in surface contact with the bearing outer ring and a lower contact portion bent downward with respect to the bone so that the surface contact with the bottom surface of the bearing support portion Spring for bearing preload characterized in that the.