JP2008208976A - Rolling bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely prevent the occurrence of metallic noises due to collision between a rolling element and the raceway surface of a bearing ring even when vibration from the outside is propagated to the inside of a bearing. <P>SOLUTION: Between a raceway surface 2a of an outer ring 2 of the deep groove ball bearing and a ball 3, an O-ring 7 is laid as an elastic body which is mounted in an annular groove 6 in a non-load region on the raceway surface 2a having no contact with the ball 3. Thus, the interference operation of the O-ring 7 surely prevents the occurrence of metallic noises due to collision between the ball 3 and each of the raceway surfaces 1a, 2a of an inner ring 1 and the outer ring 2 even when vibration from the outside is propagated to the inside of the bearing. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rolling bearing, and more particularly to a rolling bearing suitable for one used for a part that receives vibration from the outside.

  For rolling bearings that support vibrations from the outside, such as rolling bearings that support engine crankshafts, camshafts of sewing machines, etc., the rolling elements are caused to contact the raceway surface of the bearing ring by vibrations propagated inside the bearings. Collisions may occur and high-pitched metal noises may be generated. The noise of this metal sound does not occur so much when the preload is applied and the internal clearance of the bearing is killed, such as an angular ball bearing or a tapered roller bearing, and it has only a deep groove ball bearing or one of the inner and outer rings. Like a rolling bearing or the like, preload cannot be applied, and there is a backlash due to a clearance inside the bearing, which is likely to occur.

  For rolling bearings that support the crankshaft of a small engine, an elastic body is provided on the entire circumference of the outer diameter surface of the outer ring, and even if the processing accuracy such as the cylindricity of the inner diameter surface of the housing is poor, the elastic body There is one in which a gap between the outer ring and the housing is filled by the deformation of (see, for example, Patent Document 1).

JP-A-10-8982

  In order to prevent the generation of metal sound due to the collision between the rolling element and the raceway of the raceway, an elastic body is disposed around the entire outer diameter surface of the outer race as described in Patent Document 1. It is possible to do. However, the elastic body arranged on the outer diameter surface of the outer ring can reduce the amplitude of vibration from the outside to some extent, but it cannot block the propagation of vibration to the inside of the bearing and reliably prevent the generation of metallic noise. I can't do it. In addition, the outer diameter of the outer ring is increased by the amount of the elastic body, and if the thickness of the metal part of the outer ring is reduced to prevent this, there is a problem that the rigidity of the bearing is lowered.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to reliably prevent the generation of metal noise due to a collision between a rolling element and a raceway surface of a raceway even when external vibration is propagated inside the bearing. .

  In order to solve the above-described problems, the present invention provides a rolling bearing having at least one raceway of an inner ring and an outer race, and a plurality of rolling elements arranged on the raceway surface of the raceway. And a configuration in which an elastic body is interposed between the rolling elements.

  That is, by interposing an elastic body between the raceway surface of the raceway and the rolling element, even if vibration from the outside is propagated inside the bearing, the raceway between the rolling element and the raceway is caused by the interference action of this elastic body. The metal noise caused by the collision with the surface can be surely prevented. Moreover, this rolling bearing can also suppress the occurrence of surface damage such as fretting on the surface of the rolling element and the raceway surface of the raceway by preventing the rolling element from colliding with the raceway surface of the raceway.

  When the raceway surface of the raceway is given a curvature in the axial direction and a non-load region where the rolling element does not contact exists in the axial direction, the elastic body is connected to the rolling element in the non-load region. By interposing them in between, it is possible to prevent the elastic body from being damaged by the bearing load.

  The rolling bearing has both inner and outer ring raceways, and the elastic body is interposed between the raceway surfaces of the inner and outer rings and the rolling element on the same side with respect to the rolling element center. The elastic body can be easily incorporated.

  The rolling bearing has both inner and outer ring raceways, and the elastic body is interposed between the raceway surfaces of the inner and outer rings and the rolling element on the opposite side to the rolling element center. In addition, even with respect to the propagation of vibration in the axial direction, it is possible to prevent the generation of metal noise due to the collision between the rolling element and the raceway surface of the raceway.

  When the elastic body is an O-ring mounted in an annular groove provided on the raceway surface, the elastic body can be easily interposed between the raceway surface of the raceway and the rolling element.

  In the rolling bearing of the present invention, an elastic body is interposed between the raceway surface of the bearing ring and the rolling element. Therefore, even if vibration from the outside is propagated inside the bearing, the rolling element is caused by the interference action of the elastic body. It is possible to reliably prevent the generation of metal noise due to the collision between the raceway and the raceway surface. Moreover, this rolling bearing can also suppress the occurrence of surface damage such as fretting on the surface of the rolling element and the raceway surface of the raceway by preventing the rolling element from colliding with the raceway surface of the raceway.

  When the raceway surface of the raceway is given a curvature in the axial direction and there is a non-load area in the axial direction where the rolling elements do not contact, an elastic body is interposed between the rolling elements in the non-load area. By doing so, it is possible to prevent the elastic body from being damaged by the bearing load.

  The rolling bearing has both inner and outer ring raceways, and an elastic body is interposed between the raceways of the inner ring and the outer ring and the rolling element on the same side with respect to the rolling element center. The body can be easily incorporated.

  The rolling bearing has both inner and outer ring raceways, and an elastic body is interposed between the inner race and the outer raceway raceway and the rolling element on the opposite side of the rolling element center. Even with respect to the propagation of vibration in the direction, it is possible to prevent the generation of metal noise due to the collision between the rolling elements and the raceway surface of the raceway.

  By making the elastic body an O-ring mounted in an annular groove provided on the raceway surface, the elastic body can be easily interposed between the raceway surface of the raceway and the rolling element.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a first embodiment. This rolling bearing is a deep groove ball bearing in which a plurality of balls 3 as rolling elements are held in a cage 4 between a raceway surface 1 a of an inner ring 1 and a raceway surface 2 a of an outer ring 2. The sealing member 5 is sealed.

  Each raceway surface 1a, 2a of the inner ring 1 and the outer ring 2 is a raceway groove having a curvature in the axial direction, and a non-load region where the ball 3 does not contact exists on both sides of the center in the axial direction. Annular grooves 6 are provided in the non-load areas on both sides of the raceway surface 2a, and an O-ring 7 formed of fluororubber as an elastic body is interposed between the raceway surface 2a and the ball 3 in these annular grooves 6. It is installed to do. Therefore, even if vibration is propagated from the outside, the balls 3 do not collide with the raceway surfaces 1a and 2a of the inner ring 1 and the outer ring 2 due to the interference action of these O-rings 7, and the generation of noise of metal sound is generated. It is surely prevented. Further, the occurrence of surface damage such as fretting due to the collision between the ball 3 and the raceway surfaces 1a and 2a is also suppressed.

  FIG. 2 shows a second embodiment. This rolling bearing is also a deep groove ball bearing similar to that of the first embodiment, and the O-ring 7 is provided between the raceway surface 1 a of the inner ring 1 and the raceway surface 2 a of the outer ring 2 and the ball 3. It is mounted so as to be interposed on the same side with respect to the center. Other parts are the same as those of the first embodiment. In this embodiment, each O-ring 7 can be easily incorporated.

  FIG. 3 shows a third embodiment. This rolling bearing is also a deep groove ball bearing similar to that of the first embodiment, and the O-ring 7 is provided between the raceway surface 1 a of the inner ring 1 and the raceway surface 2 a of the outer ring 2 and the ball 3. It is mounted so as to be interposed on the opposite side to the center. Other parts are the same as those of the first embodiment. In this embodiment, the generation of metal noise due to the collision between the ball 3 and the raceway surfaces 1a and 2a of the inner and outer rings 1 and 2 can be prevented even with respect to the propagation of vibration in the axial direction.

  In each of the above-described embodiments, the deep groove ball bearing has an inner ring and an outer ring. However, the rolling bearing according to the present invention is not limited to such a deep groove ball bearing, and other ball bearings, roller bearings, and the like. The present invention can also be applied to a rolling bearing having only one of the inner ring and the outer ring. In addition to ball bearings using balls as rolling elements, rolling roller bearings are also available in which the raceway surface of the bearing ring is given a curvature in the axial direction and there is an unloaded area in the axial direction where the rolling elements do not contact. There is a self-aligning roller bearing having a rolling element as a rolling element, and is particularly suitable for such a rolling bearing having a non-load region on the raceway surface.

  In each of the above-described embodiments, the elastic body interposed between the raceway surface of the raceway and the rolling element is an O-ring formed of fluoro rubber. However, the type and shape of the elastic body are the same as those of the embodiment. There is no limit.

The longitudinal cross-sectional view which shows the rolling bearing of 1st Embodiment The longitudinal cross-sectional view which shows the rolling bearing of 2nd Embodiment The longitudinal cross-sectional view which shows the rolling bearing of 3rd Embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inner ring 2 Outer ring 1a, 2a Raceway surface 3 Ball 4 Cage 5 Seal member 6 Annular groove 7 O-ring

Claims (5)

  In a rolling bearing having at least one of an inner ring and an outer ring and having a plurality of rolling elements arranged on the raceway surface of the raceway, an elastic body is interposed between the raceway surface of the raceway and the rolling element. A rolling bearing characterized by that.   The raceway surface of the bearing ring is given a curvature in the axial direction, and a non-load region where the rolling element does not contact exists in the axial direction, and the elastic body is interposed between the rolling element and the non-load region. The rolling bearing according to claim 1, which is interposed.   The rolling bearing has both inner and outer ring raceways, and the elastic body is interposed between the raceway surfaces of the inner and outer rings and the rolling element on the same side with respect to the rolling element center. Item 3. A rolling bearing according to Item 1 or 2.   The rolling bearing has raceways of both an inner ring and an outer ring, and the elastic body is interposed between the raceway surfaces of the inner ring and the outer ring and the rolling element on the opposite side to the rolling element center. Item 3. A rolling bearing according to Item 1 or 2.   The rolling bearing according to any one of claims 1 to 4, wherein the elastic body is an O-ring mounted in an annular groove provided on the raceway surface.

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