Rolling bearing

Patent metadata

Field	Value
Publication number	US-11221044-B2
Application number	US-202017039242-A
Country	US
Kind code	B2
Filing date	Sep 30, 2020
Priority date	Oct 1, 2019
Publication date	Jan 11, 2022
Grant date	Jan 11, 2022

Abstract

A rolling bearing includes: an inner ring; an outer ring; a plurality of rolling elements provided between an inner ring raceway and an outer ring raceway; and a cage that holds the rolling elements at intervals in a circumferential direction. The cage includes an annular portion provided in a first axial direction with respect to the rolling elements, and a plurality of cage bars provided to extend in a second axial direction from the annular portion. The annular portion includes a contact surface that makes sliding contact with a shoulder portion. The cage bars each include a first projecting portion and a second projecting portion. The second projecting portion covers a part of the inner ring raceway on a side of the shoulder portion.

First claim

What is claimed is:

1. A rolling bearing comprising:
an inner ring that includes a shoulder portion provided in a first axial direction and an inner ring raceway;
an outer ring that includes an outer ring raceway;
a plurality of rolling elements provided between the inner ring raceway and the outer ring raceway; and
a cage that holds the rolling elements at intervals in a circumferential direction, wherein:
the cage includes an annular portion provided in the first axial direction with respect to the rolling elements, and a plurality of cage bars provided to extend in a second axial direction from the annular portion;
the annular portion includes a contact surface that makes sliding contact with the shoulder portion; and
the cage bars each include a first projecting portion provided to extend in the second axial direction from a portion including an outer peripheral side of the annular portion, and a second projecting portion provided to extend in the second axial direction from a portion including an inner peripheral side of the annular portion, the second projecting portion being shorter than the first projecting portion, and the second projecting portion covers a part of the inner ring raceway on a side of the shoulder portion, wherein
the cage includes a guide portion provided on a radially inner side of the first projecting portion and in the second axial direction from the second projecting portion to align the cage with respect to the inner ring by contacting a part of an outer peripheral portion of the inner ring during assembly of the cage, and
the guide portion includes an inclined surface that extends away from the inner ring toward the second axial direction from a flat surface of the guide portion.

2. The rolling bearing according to claim 1 , wherein the contact surface is provided with a recessed portion.

3. The rolling bearing according to claim 1 , wherein
the annular portion further includes an undercut surface provided continuously in the first axial direction from the contact surface to extend away from the shoulder portion toward the first axial direction, and
a gap is formed between the shoulder portion and the contact surface along the first and second axial directions.

4. The rolling bearing according to claim 1 , wherein a radially inside surface of the second projecting portion and the contact surface are continuous with each other, and provided along an imaginary cylindrical surface centered on a bearing center line.

5. The rolling bearing according to claim 4 , wherein a radially inside surface of the first projecting portion is provided along a second imaginary cylindrical surface centered on the bearing center line, the second imaginary cylindrical surface being larger in diameter than the imaginary cylindrical surface.

6. The rolling bearing according to claim 1 , wherein
the flat surface is continuous with an inner peripheral surface of the annular portion,
a pocket is provided between a pair of the cage bars which are adjacent in the circumferential direction, and
the pocket opens in the second axial direction with a dimension that is smaller than a diameter of the rolling element.

7. The rolling bearing according to claim 1 , wherein the contact surface makes sliding contact with the shoulder portion of the inner ring in the first axial direction.

Assignees

• Jtekt Corp

Inventors

• Kojima Keisuke
• Harada Katsuyuki
• Masuda Naoki
• Hiraoka Hironori

Classifications

• F16C33/416

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

• F16C33/3806 Primary

  Details of interaction of cage and race, e.g. retention, centring · CPC title

• F16C33/583

  Details of specific parts of races · CPC title

• F16C33/38

  Ball cages · CPC title

• F16C19/06

  with a single row or balls · CPC title