# US 8,770,847 B2 · Rolling bearing

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- Number: US 8,770,847 B2
- Document ID: US8770847B2
- Status: Granted
- Kind: B2
- Application number: 13/956,651
- Filed: 2013-08-01
- Published: 2014-02-27
- Granted: 2014-07-08
- Earliest claimed: 2012-08-21
- Assignees: Jtekt Corporation
- Applicants: JTEKT Corporation
- Inventors: Junji Murata
- Web page: https://patentgrep.com/patent/US8770847B2

## CPC

- F16C 19/50: Other types of ball or roller bearings
- F16C 33/585: {of raceways, e.g. ribs to guide the rollers}
- F16C 33/6681: {Details of distribution or circulation inside the bearing, e.g. grooves on the cage or passages in the rolling elements}
- F16C 19/06: with a single row or balls
- F16C 2300/02: General use or purpose, i.e. no use, purpose, special adaptation or modification indicated or a wide variety of uses mentioned
- F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS

## Abstract

A rolling bearing includes an inner ring, an outer rind and a plurality of rolling elements. Multiple dynamic pressure generating grooves are formed in at least one of an inner ring raceway surface and an outer ring raceway surface so as to be arranged at equal intervals in the circumferential direction. The number of the dynamic pressure generating grooves and the number of the rolling elements are set so as to establish a relationship expressed by A=[{n+(n+1)}/2]·Z, where A is the number of the dynamic pressure generating grooves, Z is the number of the rolling elements, and n is a natural number (1, 2, 3 . . . ).

## Claims

### Claim 1

A rolling bearing, comprising:
an inner ring;
an outer ring arranged radially outward of the inner ring via an annular space so as to be concentric with the inner ring; and
a plurality of rolling elements rollably arranged between an inner ring raceway surface formed in an outer peripheral face of the inner ring and an outer ring raceway surface formed in an inner peripheral face of the outer ring, wherein
multiple dynamic pressure generating grooves are formed in at least one of the inner ring raceway surface and the outer ring raceway surface so as to be arranged at equal intervals in a circumferential direction, and
the number of the dynamic pressure generating grooves and the number of the rolling elements are set so as to establish a relationship expressed by A=[{n+(n+1)}/2]·Z, where A is the number of the dynamic pressure generating grooves, Z is the number of the rolling elements, and n is a natural number (1, 2, 3 . . . ).

### Claim 2 (depends on 1)

The rolling bearing according to claim 1, wherein the multiple dynamic pressure generating grooves are formed in non-contact regions of the raceway surface, the non-contact regions being located outside and adjacent to a contact region that contacts the multiple rolling elements.