Ball bearing cage

Patent metadata

Field	Value
Publication number	US-2017191528-A1
Application number	US-201715463541-A
Country	US
Kind code	A1
Filing date	Mar 20, 2017
Priority date	Sep 30, 2014
Publication date	Jul 6, 2017
Grant date	—

Abstract

A ball bearing retainer holds balls disposed between an inner ring and an outer ring, in pockets formed at a plurality of portions, in a circumferential direction, of an annular body. The annular body includes: annular parts disposed on both sides in an axial direction; and pillar parts that are disposed at a plurality of portions in the circumferential direction and that connect between the annular parts. The pockets are formed by the annular parts and the pillar parts adjacent to each other in the circumferential direction, and allow ball guide. First contact portions of the pillar portions, which contact portions contact with the balls in the circumferential direction, are formed by first planes that extend along the axial direction, and the balls are guided by the first planes.

First claim

What is claimed is:

1 . A ball guide retainer for a ball bearing which bearing includes: an inner ring; and an outer ring; and balls interposed between the inner ring and the outer ring, the retainer comprising
an annular body formed with pockets at a plurality of portions thereof in a circumferential direction, the pockets holding the respective balls, wherein the annular body includes annular parts and pillar parts, the annular parts being disposed on both sides in an axial direction, the pillar parts being disposed at a plurality of portions spaced in the circumferential direction and connecting between the annular parts, the pockets are formed by the annular parts on both the sides in the axial direction and the pillar parts adjacent to each other in the circumferential direction, and first contact portions of the pillar portions, which contact portions contact with the balls in the circumferential direction, are formed by first planes that extend along the axial direction, and the balls are guided by the first planes.

2 . The retainer for the ball bearing as claimed in claim 1 , wherein, second contact portions of the annular parts, which contact portions contact with the balls in the axial direction, are formed by second planes that extend along the circumferential direction, and the balls are guided by the second planes.

3 . The retainer for the ball bearing as claimed in claim 2 , wherein connection regions that connect between the pillar parts and the annular parts have each a roundly-chamfered R-shape or an arc-shape.

4 . The retainer for the ball bearing as claimed in claim 2 , wherein
connection regions that connect between the pillar parts and the annular pans have each an arc-shape, arc-shaped regions of the connection regions have each an arc-shaped surface obtained by an arc center being offset from a center of a corresponding one of the pockets, and a gap is formed between the arc-shaped surface and each ball.

5 . The retainer for the ball bearing as claimed in claim 3 , wherein a radius of each connection region is greater than or equal to 15% of a total width, in the axial direction, of each pocket.

6 . The retainer for the ball bearing as claimed in claim 1 , which retainer is tailored to be used for an angular contact ball bearing.

7 . The retainer for the ball bearing as claimed in claim 1 , which retainer is made of a resin.

8 . The retainer for the ball bearing as claimed in claim 7 , which retainer is an injection molding product.

9 . The retainer for the ball bearing as claimed in claim 1 , wherein
the annular body includes two annular segments that confront each other in the axial direction of the annular body, and the pockets are formed by the annular segments being combined so as to confront each other in the axial direction.

10 . An angular contact ball bearing for a spindle of a machine tool, which ball bearing comprises the retainer as claimed in claim 1 .

Assignees

• Ntn Toyo Bearing Co Ltd

Inventors

• Inoue Wakana
• Koyama Mineo

Classifications

• F16C33/3856

  made from plastic, e.g. injection moulded window cages · CPC title

• F16C33/44

  Selection of substances (F16C33/40, F16C33/41 take precedence) · CPC title

• F16C33/3843 Primary

  formed as one-piece cages, i.e. monoblock cages · CPC title

• F16C2240/70

  Diameters; Radii · CPC title

• F16C2322/39

  General buildup of machine tools, e.g. spindles, slides, actuators · CPC title