Rolling bearing retainer and method for manufacturing such retainer

Patent metadata

Field	Value
Publication number	US-9771980-B2
Application number	US-201514816830-A
Country	US
Kind code	B2
Filing date	Aug 3, 2015
Priority date	Feb 5, 2013
Publication date	Sep 26, 2017
Grant date	Sep 26, 2017

Abstract

A rolling bearing retainer which is formed by insert molding a resinous material together with a core member within a mold, in which the core member is embedded within a resin part made of the resinous material and a support area exposure part is provided at a plurality of locations of the resin part for exposing a support area of the core member supported within a cavity of the mold. The resin part includes a ring shaped body and a plurality of support column bodies extending axially from the ring shaped body and defining a pocket for retaining a rolling element therebetween, and the core member is provided with a ring shaped body embedded part and a plurality of support column body embedded parts extending from the ring shaped body embedded part.

First claim

What is claimed is:

1. A rolling bearing retainer which is formed by insert molding a resinous material together with a core member with the use of a mold, and in which the core member is embedded within a resin part made of the resinous material and there is provided a support area exposure part at a plurality of locations of the resin part for exposing a support area of the core member supported within a cavity of the mold,
wherein the resin part includes a ring shaped body and a plurality of support column bodies extending axially from the ring shaped body and defining a pocket for retaining a rolling element therebetween, and
the core member includes a ring shaped body embedded part embedded in the ring shaped body of the resin part and a plurality of support column body embedded parts extending axially from the ring shaped body embedded part and embedded in the respective support column bodies.

2. The rolling bearing retainer as claimed in claim 1 , in which the core member is a press worked product of a metallic plate.

3. The rolling bearing retainer as claimed in claim 1 , in which each of the support column body embedded parts is in the form of a bent piece bend at a base end relative to the ring shaped body embedded part.

4. The rolling bearing retainer as claimed in claim 1 , in which the support area of the core member is in the form of a recess formed in an axial outer surface on one side of the ring shaped body embedded part, in which the support column body embedded part does not protrude.

5. The rolling bearing retainer as claimed in claim 1 , in which the rolling bearing retainer is formed as a ladder shaped type by means of a pair of the ring shaped bodies, which confront with each other while axially spaced from each other, and a plurality of the support column bodies that respectively connect the pair of the ring shaped bodies.

6. The rolling bearing retainer as claimed in claim 5 , in which a pair of core member split bodies are opposed axially to each other to form the core member, and each of those core member split bodies includes the ring shaped body embedded part and the plurality of support column body embedded parts extending axially from the ring shaped body embedded part.

7. The rolling bearing retainer as claimed in claim 6 , in which the pair of the core member split bodies are of the same shape and arranged to confront in respective directions opposite to each other.

8. The rolling bearing retainer as claimed in claim 1 , in which the rolling bearing retainer is formed as a crown shaped type by means of a single ring shaped body and a plurality of the support column bodies extending axially from one side face of the ring shaped body and defining the round pocket for retaining a ball, which is the rolling element, therebetween.

9. The rolling bearing retainer as claimed in claim 1 , in which the rolling bearing retainer is formed as a comb shaped type by means of a single ring shaped body and a plurality of the support column bodies extending axially from one side face of the ring shaped body and defining the pocket for retaining a roller, which is the rolling element, therebetween.

10. A rolling bearing utilizing the retainer as claimed in claim 1 .

11. A rolling bearing which comprises a plurality of the rolling elements retained by the retainer as claimed in claim 1 , in which the plurality of rolling elements are interposed between an inner ring and an outer ring, and
a mutual error of a rolling element diameter is not greater than 2 μm for each of the plurality of rolling elements.

12. The rolling bearing as claimed in claim 11 , in which the resinous material has a Young's modulus not higher than 9 GPa.

13. The rolling bearing as claimed in claim 11 , in which at least one of the inner ring, the outer ring and the plurality of the rolling elements is made of a ceramic material.

14. The rolling bearing as claimed in claim 11 , in which the circularity of the rolling element is not greater than 1 μm.

Assignees

• Ntn Toyo Bearing Co Ltd

Inventors

• Hayashi Tatsuya
• Moriuchi Mitsuhiro

Classifications

• B29K2105/20

  Inserts · CPC title

• B29L2031/04

  Bearings · CPC title

• B29K2101/00

  Use of unspecified macromolecular compounds as moulding material {(use of unspecified rubbers B29K2021/00)} · CPC title

• F16C33/49

  comb-shaped · CPC title

• B29C45/14819

  the inserts being completely encapsulated · CPC title