Ball bearing

Patent metadata

Field	Value
Publication number	US-10422382-B2
Application number	US-201815879595-A
Country	US
Kind code	B2
Filing date	Jan 25, 2018
Priority date	Feb 6, 2017
Publication date	Sep 24, 2019
Grant date	Sep 24, 2019

Abstract

A cage of a ball bearing includes an annular portion located on a first axial side with respect to balls, the first axial side being one side in an axial direction of the ball bearing, and cage bars extending from the annular portion toward a second axial side, the second axial side being the other side in the axial direction of the ball bearing. A space located on a second axial side of the annular portion and defined between any two of the cage bars adjacent to each other in a circumferential direction serves as a pocket that accommodates a corresponding one of the balls. The pocket has a contact surface that is brought into point contact with the ball at an intersection point between a rotational center axis of the ball and a surface of the ball when the cage is displaced toward the second axial side.

First claim

What is claimed is:

1. A ball bearing comprising:
an inner ring that has an inner raceway groove on an outer peripheral surface of the inner ring;
an outer ring that has an outer raceway groove on an inner peripheral surface of the outer ring;
a plurality of balls interposed between the inner raceway groove and the outer raceway groove; and
an annular cage that holds the balls, wherein:
the cage includes:
an annular portion located on a first axial side with respect to the balls, the first axial side being one side in an axial direction of the ball bearing, and
a plurality of cage bars extending from the annular portion toward a second axial side, the second axial side being the other side in the axial direction of the ball bearing;

a space located on the second axial side of the annular portion and defined between any two of the cage bars adjacent to each other in a circumferential direction serves as a pocket that accommodates a corresponding one of the balls;
the pocket has a contact surface that is brought into point contact with the ball at an intersection point between a rotational center axis of the ball and a surface of the ball when the cage is displaced toward the second axial side; and
the pocket has facing surfaces with the contact surface interposed inbetween as a center, one of the facing surfaces disposed on a radially outward side of the contact surface and facing the ball, and the other of the facing surfaces disposed on a radially inward side of the contact surface and facing the ball, the facing surfaces being continuous with the contact surface and non-parallel with respect to the contact surface, each facing surface having a length, along a circumferential direction of the cage, that is greater than a length of the contact surface along the circumferential direction.

2. The ball bearing according to claim 1 , wherein
the cage has a guide portion that is brought into contact with either of the inner ring or the outer ring when the cage is displaced toward the first axial side.

3. The ball bearing according to claim 2 , wherein
in a neutral state in which a center of the pocket and a center of the ball coincide with each other, a clearance formed between the ball and the facing surface on the radially outward side of the contact surface and a clearance formed between the ball and the facing surface on the radially inward side of the contact surface are larger than a clearance formed between the ball and the contact surface in the neutral state.

4. The ball bearing according to claim 3 , wherein
in the neutral state in which the center of the pocket and the center of the ball coincide with each other, of all clearances formed between the pocket and the ball, the clearance formed between the contact surface and the ball is the smallest.

5. The ball bearing according to claim 2 , wherein
in a neutral state in which a center of the pocket and a center of the ball coincide with each other, of all clearances formed between the pocket and the ball, the clearance formed between the contact surface and the ball is the smallest.

6. The ball bearing according to claim 1 , wherein
in a neutral state in which a center of the pocket and a center of the ball coincide with each other, a clearance formed between the ball and the facing surface on the radially outward side of the contact surface and a clearance formed between the ball and the facing surface on the radially inward side of the contact surface are larger than a clearance formed between the ball and the contact surface in the neutral state.

7. The ball bearing according to claim 6 , wherein
in the neutral state in which the center of the pocket and the center of the ball coincide with each other, of all clearances formed between the pocket and the ball, the clearance formed between the contact surface and the ball is the smallest.

8. The ball bearing according to claim 1 , wherein
in a neutral state in which a center of the pocket and a center of the ball coincide with each other, of all clearances formed between the pocket and the ball, the clearance formed between the contact surface and the ball is the smallest.

9. The ball bearing according to claim 1 , wherein each facing surface is a spherical surface.

Assignees

• Jtekt Corp

Inventors

• Kamamoto Shigeo
• Murata Junji
• Shishihara Yuki

Classifications

• F16C19/163

  with angular contact · CPC title

• F16C19/06

  with a single row or balls · CPC title

• F16C33/416 Primary

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

• F16C33/418

  Details of individual pockets, e.g. shape or ball retaining means · CPC title

• F16C19/16 Primary

  with a single row of balls · CPC title