JP2001214930A - Interval body for ball bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize the dimension accuracy of respective parts in resin molding, to shorten the resin molding time, improve the lubricating performance, and reduce the manufacturing cost. SOLUTION: A lot of ball rolling bodies 3 are interposed between an outer ring 1 and an inner ring 2 in the ball bearing, and resin interval bodies 4 are assembled between adjoining rolling bodies 3, 3 so as to prevent the rolling bodies 4 from contacted with each other. The resin interval body 4 has a pair of partial spherical parts 5, 5 corresponding to the spherical shapes of the adjoining ball rolling bodies 3, 3 in its both sides, and a though hole 6 for storing lubricant is formed between the partial spherical parts 5, 5. A plurality (eight in this illustration) of recesses 8 divided circumferentially are formed in the outer circumference of the interval body 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spacing member for a ball bearing incorporated between adjacent rolling members in order to prevent contact between the rolling members of the ball, and more particularly, to the dimensional accuracy of each part during resin molding. The present invention relates to a ball bearing spacing member which achieves stabilization, shortens a resin molding time, remarkably improves lubrication performance, and reduces manufacturing costs.

[0002]

2. Description of the Related Art As shown in FIGS. 4 and 5, in a ball bearing, a plurality of ball rolling elements 3 are provided between an outer ring 1 and an inner ring 2.
In order to prevent the contact between the rolling elements 3, a spacer 4 made of resin is provided between the adjacent rolling elements 3 and 3.
Is incorporated.

As shown in FIG. 6, such a resin spacer 4 has a pair of partial spherical portions 5, 5 corresponding to the spherical shapes of the rolling elements 3, 3 of adjacent balls on both side surfaces thereof. And a through hole 6 for storing a lubricant is formed between the partial spherical portions 5 and 5.

[0004]

The resin spacer 4 shown in FIG. 6 is formed by integral molding of the resin. However, as shown in FIG. , 5, the portions 7, 7 are relatively thick in thickness, and the thickness balance of each portion may be poor. In the case where the size of the ball rolling element 3 is relatively small and the size of the spacing body 4 is also small, even if the wall thickness balance is slightly poor, there is almost no deformation (distortion) after molding at the time of resin molding and stable. The dimensional accuracy of each part can be obtained.

However, when the size of the ball rolling element 3 is relatively large and the spacing element 4 needs to be large,
If the thickness balance of each part of the spacing member 4 is poor, each part does not shrink uniformly, but shrinks unbalanced during resin molding. As a result, deformation (distortion) occurs after molding, and the dimensional accuracy of each part such as the partial spherical parts 5, 5 is not stabilized. Conversely, if it is intended to obtain stable dimensional accuracy, it is difficult to set the conditions. There is.

[0006] If each part does not shrink uniformly during resin molding, the resin molding time may be prolonged.

Further, a through hole 6 for storing lubricant is formed between the partial spherical portions 5 and 5 of the spacer 4, and a lubricant is provided on the outer peripheral surface of the spacer 4. There is a case where there is no storage location for storing, and lubrication with the raceway surfaces of the outer ring 1 and the inner ring 2 cannot be sufficiently achieved.

The present invention has been made in view of the above-mentioned circumstances, and aims to stabilize the dimensional accuracy of each part at the time of resin molding, shorten the resin molding time, and further improve the lubrication performance. It is an object of the present invention to provide a ball bearing spacing member which significantly improves the performance of the ball bearing and thus reduces the manufacturing cost.

[0009]

In order to achieve the above-mentioned object, a ball bearing spacing member according to the present invention is for a ball bearing in which a number of ball rolling elements are interposed between an outer ring and an inner ring. In order to prevent contact between the rolling elements of adjacent balls, a pair of partial spherical portions that are incorporated between the rolling elements of adjacent balls and substantially correspond to the spherical shapes of the rolling elements of adjacent balls are provided. A plurality of recesses divided in the circumferential direction are formed on the outer peripheral surface of the spacer in the spacer body for a resin ball bearing having a through hole between the partial spherical portions.

As described above, according to the present invention, since the plurality of concave portions divided in the circumferential direction are formed on the outer peripheral surface of the spacer, the thickness of the portion between the pair of partial spherical portions can be compared. The thickness of each part can be made uniform (see FIG. 2A), the thickness of each part can be equalized, and the thickness balance of each part can be improved. Therefore, even if the size of the rolling element of the ball is relatively large and the spacing body is also large, since the thickness balance of each part of the spacing body is good, each part is formed at the time of resin molding. Are uniformly balanced and contracted, and deformation (distortion) after molding can be reliably prevented. Therefore, the dimensional accuracy of each part can be stabilized, and the resin molding time can be reduced, and the manufacturing cost can be reduced.

Further, since a plurality of concave portions divided in the circumferential direction are formed on the outer peripheral surface of the spacer, lubricant can be stored in these concave portions, and the lubricating performance of the outer race and the inner race with the raceway surface is remarkably improved. can do.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A spacing member for a ball bearing according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a ball bearing incorporating a spacer for a ball bearing according to an embodiment of the present invention.
FIG. 2A is a cross-sectional view of a spacing member for a ball bearing according to an embodiment of the present invention, and FIG. 2B is a cross-sectional view taken along line bb of FIG.

As shown in FIG. 1, in a ball bearing, a number of rolling elements 3 of balls are interposed between an outer ring 1 and an inner ring 2 to prevent the rolling elements 3 from coming into contact with each other. A spacing member 4 made of resin is incorporated between the adjacent rolling elements 3 and 3.

As shown in FIG. 2, a pair of partial spherical portions 5 and 5 corresponding to the spherical shapes of the rolling elements 3 and 3 of adjacent balls are formed on both sides of the resin spacer 4 as shown in FIG. And a through hole 6 for storing a lubricant is formed between the partial spherical portions 5 and 5.

In this embodiment, the outer peripheral surface of the spacer 4 is
A plurality (eight in the illustrated example) of concave portions 8 divided in the circumferential direction are formed. The shape of each recess 8 is substantially triangular in the illustrated example, but is not limited thereto, and may be various shapes. Preferably, the recess 8 is formed between a pair of partial spherical portions 5. It is preferable that the shape is such that the thickness of the portion becomes uniform.

As described above, since the plurality of concave portions 8 divided in the circumferential direction are formed on the outer peripheral surface of the spacing member 4, FIG.
As shown in (a), the thickness of the portion between the pair of partial spherical portions 5, 5 can be made relatively thin, the thickness of each portion can be equalized, and the thickness of each portion can be increased. Good balance can be achieved. Therefore, even when the size of the ball rolling element 3 is relatively large and the spacing member 4 needs to be large, since the thickness balance of each part of the spacing member 4 is good, resin molding is performed. Occasionally, each part is evenly balanced and contracted, so that deformation (distortion) after molding can be reliably prevented. Therefore, the dimensional accuracy of each part can be stabilized, and the resin molding time can be reduced, and the manufacturing cost can be reduced.

As described above, the outer peripheral surface of the spacer 4 is
Since the plurality of concave portions 8 divided in the circumferential direction are formed, the lubricant can be stored in these concave portions 8, and the lubricating performance of the outer ring 1 and the inner ring 2 with the raceway surface can be significantly improved.

Next, a modified example will be described with reference to FIG. FIG. 3A is a cross-sectional view of a spacer for a ball bearing according to a modification of the embodiment of the present invention, and FIG.
It is a side view of the spacer for ball bearings shown to (a).

In this modification, a plurality of recesses 9 are also formed on the bottom surfaces of the partial spherical portions 5 and 5. These recesses 9 have a shape extending in the circumferential direction as shown in FIG. 3B, but are not limited thereto, and may have various shapes.

The above-described recess 8 on the outer peripheral surface of the spacing member 4 can mainly improve the lubricating performance with the raceway surfaces of the outer ring 1 and the inner ring 2, but in the case of the present modification, in addition to this, the rolling of the ball Lubrication performance with the moving body 3 can be improved.

The present invention is not limited to the above-described embodiment, but can be variously modified.

[0023]

As described above, according to the present invention,
Since a plurality of concave portions divided in the circumferential direction are formed on the outer peripheral surface of the spacer, the thickness of the portion between the pair of partial spherical portions can be made relatively thin (see FIG. 2A). ), The thickness of each part can be equalized, and the thickness balance of each part can be improved. Therefore, even if the size of the rolling element of the ball is relatively large and the spacing body is also large, since the thickness balance of each part of the spacing body is good, each part is formed at the time of resin molding. Are uniformly balanced and contracted, and deformation (distortion) after molding can be reliably prevented. Therefore, the dimensional accuracy of each part can be stabilized, and the resin molding time can be reduced, and the manufacturing cost can be reduced.

Further, since a plurality of concave portions divided in the circumferential direction are formed on the outer peripheral surface of the spacer, lubricant can be stored in these concave portions, and the lubricating performance of the outer race and the inner race with the raceway surface is remarkably improved. can do.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a ball bearing incorporating a ball bearing spacer according to an embodiment of the present invention.

2A is a cross-sectional view of a spacer for a ball bearing according to an embodiment of the present invention, and FIG. 2B is a cross-sectional view taken along line bb of FIG.

3A is a cross-sectional view of a ball bearing spacer according to a modification of the embodiment of the present invention, and FIG. 3B is a side view of the ball bearing spacer shown in FIG. .

FIG. 4 is a radial sectional view of a conventional ball bearing.

FIG. 5 is a sectional view of a conventional ball bearing in a circumferential direction.

FIG. 6A is a front view of a conventional ball bearing spacer, and FIG. 6B is a side view of the spacer shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer ring 2 Inner ring 3 Ball rolling element 4 Spacing element 5 Partially spherical part 6 Through hole 7 Part between partial spherical parts 8 Recess 9 Recess

Claims (1)

[Claims] 1. A ball bearing having a plurality of rolling elements of balls interposed between an outer ring and an inner ring, wherein the rolling elements of adjacent balls are prevented from contacting each other. Has a pair of partial spherical portions substantially corresponding to the spherical shape of the rolling element of the adjacent ball, between these partial spherical portions,
A spacer for a ball bearing made of a resin having a through hole, wherein a plurality of concave portions divided in a circumferential direction are formed on an outer peripheral surface of the spacer.