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Method of manufacturing bearing holder

A manufacturing method and technology of retainer, applied in the direction of bearings, ball bearings, bearing components, etc., can solve problems such as damage, inability to uniformly mix molten resin, damage, etc.

Inactive Publication Date: 2017-12-01
NSK LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In general, it is well known that such an injection molded resin cage for bearings is formed only by fusion of molten resin, so the molten resin cannot be mixed uniformly, and the strength of 100W in the welded part will decrease.
[0004] In addition, in the case where a reinforcing fiber material such as glass fiber, carbon fiber, or metal fiber is added as a reinforcing material to the molten resin, the reinforcing fiber material is oriented perpendicular to the flow direction of the molten resin at the welded portion 100W, so that the reinforcing effect cannot be achieved.
Also, in the portion other than the welded portion 100W, the reinforcing fiber material is oriented parallel to the flow direction of the molten resin, so the strength difference between the portion and the welded portion increases.
[0005] In this way, resin cages for bearings produced by injection molding are often damaged from the welded part with weak strength.
In particular, if the welded part is formed at the place where stress is most likely to concentrate (for example, the bottom of the pocket where the wall thickness is the thinnest in the axial direction, the R part of the corner where the annular part and the column part intersect), then This part is prone to damage and will impair the durability of the retainer

Method used

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  • Method of manufacturing bearing holder
  • Method of manufacturing bearing holder
  • Method of manufacturing bearing holder

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0093] figure 1 The cage 1 for bearings of this embodiment is shown in 2 (hereinafter, it may be simply referred to as a cage). The retainer 1 is a so-called crown-shaped retainer, having a substantially annular base 10, and a plurality of even numbers (the present invention) protruding axially at predetermined intervals in the circumferential direction from one end side 12 of the base 10 in the axial direction. In the embodiment, there are 14) column parts 20, and a plurality of even-numbered (14 in this embodiment) pockets 30 for holding a bearing rotating body (not shown), and the pockets 30 are formed by The mutually opposing surfaces 22 , 22 of a pair of adjacent column parts 20 , 20 are formed with the one end side surface 12 of the base part 10 in the axial direction. That is, the number of the column parts 20 and the pockets 30 are the same, and both are formed in a plurality of even numbers, and the column parts 20 are provided on both sides in the circumferential d...

no. 2 Embodiment approach

[0101] Next, a method of manufacturing a bearing cage according to a second embodiment of the present invention will be described with reference to the drawings.

[0102] Such as figure 2 As shown, the present embodiment is different from the above-described embodiment in that the resin storage portion 40 is provided on the inner peripheral surface of the column portion 20 . Other configurations are the same as those of the above-mentioned embodiment, and the same effects as those of the above-mentioned embodiment can be achieved.

no. 3 Embodiment approach

[0104] Next, a method of manufacturing a bearing cage according to a third embodiment of the present invention will be described with reference to the drawings.

[0105] Such as image 3 As shown, the present embodiment differs from the above-described embodiment in that the resin storage portion 40 is provided on the outer peripheral surface or the inner peripheral surface of the column portion 20 . More specifically, the positions of adjacent resin storage parts 40 on the column part 20 are different. inner peripheral surface. It should be noted that the adjacent resin storage parts 40 are not necessarily arranged at different positions of the column part 20, among the plurality of resin storage parts 40, as long as at least one resin storage part 40 is provided on the outer peripheral surface of the column part 20, and at least One resin storage portion 40 may be provided on the inner peripheral surface of the column portion 20 . Other configurations are the same as thos...

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PUM

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Abstract

A bearing holder is molded by injecting a melted resin, from a plurality of resin injection gates provided at the peripheral edge of a substantially annular cavity formed in a molding die, into the cavity. At least one column portion is provided with a resin accumulating portion in which the melted resin can be accumulated. The cross-sectional area of a connection portion of the resin accumulating portion connected to the column portion is equal to or smaller than 1 / 4 of the cross-sectional area of the resin injection gate.

Description

technical field [0001] The present invention relates to a method of manufacturing a cage for a bearing. Background technique [0002] In general, cages for bearings are produced by injection molding. Specifically, such as Figure 18 As shown, an annular cavity 140 corresponding to a cage for a bearing as a molded body is formed in a molding die, and a molten resin material (thermoplastic resin) is injected from a resin injection gate 150 provided at a peripheral portion of the cavity 140. , after cooling and solidification to manufacture bearing cages. [0003] The molten resin injected into the cavity 140 is divided into two resin streams along both sides in the circumferential direction in the cavity 140 and flows, and then merges again at the position opposite to the resin injection gate 150 in the radial direction, and joins with each other. A welded portion 100W is formed. In general, it is well known that such an injection-molded resin cage for bearings is formed on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C45/26F16C19/00F16C33/41F16C33/49
CPCF16C2220/04F16C33/416B29L2031/045F16C2300/02B29C45/2708B29C45/0025B29C45/0046F16C19/06B29C2045/0027B29C45/26F16C19/00F16C33/41F16C33/49
Inventor 仓本吉和相原成明平本隆之
Owner NSK LTD