# US 10,871,191 B2 · Rolling bearing and bearing structure including same

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- Number: US 10,871,191 B2
- Document ID: US10871191B2
- Status: Granted
- Kind: B2
- Application number: 16/490,362
- Filed: 2018-03-01
- Published: 2020-01-09
- Granted: 2020-12-22
- Earliest claimed: 2017-03-03
- Assignees: Ntn Corporation
- Applicants: Ntn Corporation
- Inventors: Katsuaki Sasaki
- Web page: https://patentgrep.com/patent/US10871191B2

## CPC

- F16C 33/385: {made from metal, e.g. cast or machined window cages}
- F16C 33/3887: {Details of individual pockets, e.g. shape or ball retaining means}
- F16C 19/06: with a single row or balls
- F16C 33/3806: {Details of interaction of cage and race, e.g. retention, centring}
- F16C 33/414: {formed as one-piece cages, i.e. monoblock comb cages}
- F16C 33/44: Selection of substances (F16C33/40, F16C33/41 take precedence)
- F16C 33/4635: {made from plastic, e.g. injection moulded window cages}
- F16C 33/6681: {Details of distribution or circulation inside the bearing, e.g. grooves on the cage or passages in the rolling elements}
- F16C 2204/14: with zinc as the next major constituent
- F16C 2208/60: Polyamides [PA]
- F16C 2240/26: Speed, e.g. rotational speed
- F16C 2300/22: High-speed rotation
- F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS

## Abstract

A rolling bearing including a cage is provided. The cage includes, on its outer peripheral surface, a plurality of ridges protruding radially outwardly, and circumferentially spaced apart from each other. The ridges extend in the axial direction or in an oblique direction or directions relative to the circumferential direction. The ridges are capable of coming into contact with the inner peripheral surface of the outer ring through lubricating oil.

## Claims

### Claim 1

A rolling bearing comprising:
an outer ring;
an inner ring for retaining a rotary shaft;
rolling elements between the outer ring and the inner ring; and
a cage rotatably retaining the rolling elements, and configured to be guided by the outer ring,
wherein the cage has an endless annular shape, when the cage is seen in an axial direction,
wherein the cage includes, on an outer peripheral surface of the cage, a plurality of ridges protruding outwardly in a radial direction, and spaced apart from each other in a circumferential direction at intervals within the range of 0.3 mm or more and 2.6 mm or less,
wherein each of the ridges extends either in the axial direction or in an oblique direction or directions relative to the circumferential direction, and
wherein the ridges are capable of coming into contact with an inner peripheral surface of the outer ring through lubricating oil.

### Claim 2 (depends on 1)

The rolling bearing according to claim 1, wherein each of the ridges includes a semi-columnar apex portion, and each ridge has a semicircular shape when viewed in the axial direction.

### Claim 3 (depends on 2)

The rolling bearing according to claim 2, wherein the cage comprises a machined cage formed by machining brass.

### Claim 4 (depends on 3)

A bearing structure comprising the rolling bearing according to claim 3, and the rotary shaft,
wherein a dmn value which is a product of a pitch circle diameter dm of the rolling bearing and a number n of revolutions of the rolling bearing is 600,000 or more.

### Claim 5 (depends on 2)

A bearing structure comprising the rolling bearing according to claim 2, and the rotary shaft,
wherein a dmn value which is a product of a pitch circle diameter dm of the rolling bearing and a number n of revolutions of the rolling bearing is 600,000 or more.

### Claim 6 (depends on 1)

The rolling bearing according to claim 1, wherein the cage comprises a machined cage formed by machining brass.

### Claim 7 (depends on 6)

A bearing structure comprising the rolling bearing according to claim 6, and the rotary shaft,
wherein a dmn value which is a product of a pitch circle diameter dm of the rolling bearing and a number n of revolutions of the rolling bearing is 600,000 or more.

### Claim 8 (depends on 1)

A bearing structure comprising the rolling bearing according to claim 1, and the rotary shaft,
wherein a dmn value which is a product of a pitch circle diameter dm of the rolling bearing and a number n of revolutions of the rolling bearing is 600,000 or more.