JP2004332900A - Bearing cage - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a highly reliable bearing cage manufacturable at a low cost without affecting bearing noises and a bearing life by pressingly adhering the outer ring raceway surface for balls of a ball bearing without contraction and deformation. <P>SOLUTION: This bearing cage comprises a circular burring hole 11 slightly larger in diameter than the outer diameter ϕA of the ball bearing 2, allows a square shape capable of forming a circumscribed circle slightly larger than the inner diameter ϕB of the burring hole 11 to pass therethrough, and projections 12 allowing the ball bearing 2 to be press-fitted are formed on both sides of the square shape holding corners. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a ball bearing bearing retainer having a projection provided in a burring hole used for a small motor or the like.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, press-fitting and bonding are generally performed for holding ball bearings used in small motors and the like. When press-fitting the outer ring of a ball bearing into a circular burring hole, if the load applied to the contact portion between the ball and the outer ring raceway surface is large, the outer ring raceway surface shrinks, the radial clearance becomes smaller, and normal rotation such as lock cannot be obtained. When the outer raceway surface deforms, it appears as vibration and noise when rotating, so it was pressed in with a light press force to ease the load on the outer raceway surface, and the position was maintained until the adhesive dried. .
[0003]
When press-fitting and bonding a ball bearing to a burring hole by press working, the burring hole is press-fitted over the entire area in both the circumferential direction and the axial direction. The method was taken. Even when finishing by machining, the inner diameter hole of the bearing retainer is provided with a positioning step that abuts the end surface of the outer ring of the ball bearing when inserting the ball bearing, or as a bonding part with the outer ring of the ball bearing. Press-fitting / adhesion is known in which an annular groove and an outer ring press-fitting portion are provided, and the entire outer periphery of the ball bearing is not press-fitted (for example, see Patent Document 1).
[0004]
[Patent Document 1]
JP-A-11-16263 (pages 3-5, FIGS. 1 and 2)
[0005]
[Problems to be solved by the invention]
However, in order to form the positioning step portion, the annular groove, and the outer ring press-fitting portion provided on the retainer with high accuracy, a cutting process or a grinding process is required, so that there has been a problem that it is expensive.
[0006]
An object of the present invention is to solve such a conventional problem, and an object of the present invention is to provide a bearing retainer which is provided with a projection in an axial direction of a burring hole and can easily and inexpensively fix a ball bearing.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention provides a bearing retainer which can provide a streaky projection by pressing in the axial direction of a burring hole, can press-fit a ball bearing, and can easily fix the ball bearing at low cost. Can be obtained.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
In order to solve the above problem, the bearing retainer according to claim 1 has a circular burring hole slightly larger than the outer diameter of the ball bearing, and has a circumscribed circle slightly larger than the inner diameter of the burring hole. Is penetrable, and has protrusions on both sides sandwiching each corner of the square so that the ball bearing can be press-fitted.The ball bearing holds its position by light press-fitting without deforming its outer ring raceway surface Adhesion is possible.
[0009]
【Example】
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0010]
(Example 1)
In FIG. 1, reference numeral 1 denotes a bearing retainer having a burring hole 11 slightly larger than the outer diameter φA of the ball bearing 2 and having a diameter φB. When A is equal to or less than 20 mm, (BA) becomes a pool for the adhesive, but is preferably about 0.01 to 0.05 mm, depending on the type of the adhesive. Further, in the inner peripheral portion of the burring hole 11, a square having a circumscribed circle slightly larger than the inner diameter (φB) shown in FIG. 1 and having a square “D” in FIG. 1 can penetrate, and both sides sandwiching each corner of the square The inner diameter φC including the protrusion 12 is smaller than the outer diameter φA of the ball bearing 2 so that the ball bearing 2 is lightly press-fitted. When A is 20 mm or less, (AC) is desirably about 0.01 to 0.03. When press-fitting and fixing the ball bearing 2 to the bearing retainer 1 configured as described above, first, an adhesive is applied to the inner diameter 11 of the bearing retainer or the outer periphery 21 of the ball bearing 2, and a jig or the like is used. Press-fit to a predetermined position in the axial direction, and bond and dry. At this time, since (AC) is set to 0.01 to 0.03, the position of the ball bearing 2 is a very light press-fit requiring only a holding force until the adhesive is dried. Accordingly, the deformation of the outer ring raceway surface 22 of the ball bearing 2 due to the press-fitting is extremely small and can be prevented from generating vibration, noise, and the like due to the deformation at the time of the press-fitting within a negligible range. Further, since the adhesive accumulates in the burring holes 11 other than the protrusions 12, a sufficient bonding area is secured, and the holding strength of the ball bearing 2 is secured.
[0011]
Here, a method for manufacturing the bearing cage 1 will be described. First, a circular burring hole 11 is formed in a sheet metal material by press working. Next, a square core pin which is a circumscribed circle slightly larger than the inner diameter of the burring hole 11 is passed through the burring hole 11. By passing this square core pin, an axial projection 12 is formed on both sides sandwiching each corner, and the inner diameter including the projection 12 is smaller than the inner diameter of the ball bearing 2 so that the ball bearing 2 is lightly press-fitted. The dimensions have been adjusted. Although the holding strength can be obtained even if the square core pin is a polygon other than the square, the inner diameter including the protrusion 12 is an important control point. Therefore, a square that can be maintained by surface grinding or the like is desirable.
[0012]
As described above, the bearing retainer of the present invention can be manufactured only by press working, and does not require machining such as cutting and grinding as in the past, so that its productivity is high, and high precision is maintained at low cost. be able to.
[0013]
【The invention's effect】
As is apparent from the above embodiment, according to the first aspect of the present invention, the load applied to the contact portion between the ball and the outer raceway surface is small, and the shrinkage or deformation of the outer raceway surface is maintained at a negligible level. The retainer does not require machining such as cutting and grinding as in the related art, and can be manufactured only by pressing.
[0014]
Therefore, an inexpensive and high-precision bearing cage can be provided.
[Brief description of the drawings]
FIG. 1 is a sectional view and a front view of a bearing cage and a ball bearing according to a first embodiment of the present invention.
DESCRIPTION OF SYMBOLS 1 Bearing retainer 2 Ball bearing 11 Burring hole 12 Projection 21 Outer circumference 22 Outer ring raceway surface A Ball bearing outer diameter B Burring hole diameter C Inner diameter D including projection Square core pin dimensions

Claims (1)

In a bearing retainer having a circular burring hole for holding a ball bearing and maintaining its holding strength with an adhesive, the bearing retainer has a circular burring hole slightly larger than the outer diameter of the ball bearing, and slightly larger than the inner diameter of the burring hole. A bearing retainer having a large circumscribed square penetrating therethrough and having projections on both sides sandwiching each corner of the square so that a ball bearing is press-fitted.

Images