Rolling bearing

Patent metadata

Field	Value
Publication number	US-11199226-B2
Application number	US-202016856413-A
Country	US
Kind code	B2
Filing date	Apr 23, 2020
Priority date	Apr 26, 2019
Publication date	Dec 14, 2021
Grant date	Dec 14, 2021

Abstract

A rolling bearing includes a first raceway surface; a second raceway surface; and a plurality of rolling elements rotatably arranged between the first raceway surface and the second raceway surface. Multiple recesses are provided on at least one surface among the first raceway surface, the second raceway surface, and rolling surfaces of the plurality of the rolling elements. An area ratio of openings of the recesses to the at least one surface is in a range of 5% to 37%. An equivalent circle diameter of the opening of each of the recesses is in a range of 1 μm to 27 μm. A depth of each of the recesses in a direction normal to the at least one surface is in a range of 3 μm to 10 μm. A surface waviness of the at least one surface excluding the recesses is smaller than or equal to 0.2 μm.

First claim

What is claimed is:

1. A rolling bearing comprising:
a first raceway surface;
a second raceway surface; and
a plurality of rolling elements rotatably arranged between the first raceway surface and the second raceway surface, wherein
multiple recesses are provided on at least one surface among the first raceway surface, the second raceway surface, and rolling surfaces of the plurality of the rolling elements,
an area ratio of openings of the recesses to the at least one surface is in a range of 5% to 37%,
an equivalent circle diameter of the opening of each of the recesses is in a range of 1 μm to 27 μm,
a depth of each of the recesses in a direction normal to the at least one surface is in a range of 3 μm to 10 μm, and
a surface waviness of the at least one surface excluding the recesses is smaller than or equal to 0.2 μm.

2. The rolling bearing according to claim 1 , wherein the rolling elements are rollers.

3. The rolling bearing according to claim 2 , wherein each of the rolling elements is any one of a needle roller, a cylindrical roller, and a long cylindrical roller.

Assignees

• Jtekt Corp

Inventors

• Murata Junji
• Kamamoto Shigeo
• Shishihara Yuki

Classifications

• F16C33/585

  of raceways, e.g. ribs to guide the rollers · CPC title

• F16H2057/085

  Bearings for orbital gears · CPC title

• F16C19/26

  with a single row of rollers · CPC title

• F16C33/6677

  from radial inside, e.g. via a passage through the shaft and/or inner ring · CPC title

• F16C33/34 Primary

  Rollers; Needles · CPC title