# US 8,783,965 B2 · Tapered roller bearing

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- Number: US 8,783,965 B2
- Document ID: US8783965B2
- Status: Granted
- Kind: B2
- Application number: 11/578,327
- Filed: 2005-04-18
- Published: 2009-01-01
- Granted: 2014-07-22
- Earliest claimed: 2004-05-13
- Assignees: Ntn Corporation
- Applicants: Takashi Tsujimoto
- Inventors: Takashi Tsujimoto
- Web page: https://patentgrep.com/patent/US8783965B2

## CPC

- F16C 33/6681: {Details of distribution or circulation inside the bearing, e.g. grooves on the cage or passages in the rolling elements}
- F16C 19/364: {with tapered rollers, i.e. rollers having essentially the shape of a truncated cone}
- F16C 33/4605: {Details of interaction of cage and race, e.g. retention or centring}
- F16C 33/4635: {made from plastic, e.g. injection moulded window cages}
- F16C 2240/30: Angles, e.g. inclinations
- F16C 2240/34: Contact angles
- F16C 2240/82: Degree of filling, i.e. sum of diameters of rolling elements in relation to PCD
- F16C 2240/84: with full complement of balls or rollers, i.e. sum of clearances less than diameter of one rolling element
- F16C 2361/61: Toothed gear systems, e.g. support of pinion shafts
- F16H 2048/423: {characterised by bearing arrangement}
- F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16H: GEARING

## Abstract

A tapered roller bearing is used in transmissions or differentials for automobiles. The tapered roller bearing includes an inner ring, an outer ring, a plurality of tapered rollers rollably disposed between the inner and outer rings, and a cage for holding the tapered rollers at circumferential predetermined intervals. The roller coefficient γ exceeds 0.94, where γ is (the number of rollers×mean roller diameter)/(π×PCD).

## Claims

### Claim 1

A tapered roller bearing comprising:
an inner ring;
an outer ring;
a plurality of tapered rollers rollably disposed radially between said inner and outer rings; and
a cage having a small diameter side, a large diameter side and a plurality of pockets for holding said tapered rollers at circumferential predetermined intervals, wherein
each of said pockets has a small diameter side end wall located at said small diameter side of said cage and a large diameter side end wall located at said large diameter side of said cage,
each of said tapered rollers has a small diameter end facing said small diameter side end wall of a respective one of said pockets and a large diameter end facing said large diameter side end wall of said respective one of said pockets,
a distance between said large and small diameter side end walls of said pockets is greater than a distance between said large and small diameter ends of said tapered rollers to form a clearance therebetween,
when said cage is positioned such that a portion of the clearance exists between said large diameter side end walls of said pockets and said large diameter ends of said tapered rollers and another portion of the clearance exists between said small diameter side end walls of said pockets and said small diameter ends of said tapered rollers, said cage is movable radially from a central axis of said outer ring without contacting said outer ring,
when said cage is positioned such that all of the clearance exists between said small diameter side end walls of said pockets and said small diameter ends of said tapered rollers and none of the clearance exists between said large diameter side end walls of said pockets and said large diameter ends of said tapered rollers, said cage is movable radially from the central axis of said outer ring to come into contact with said outer ring,
the tapered roller bearing has a roller coefficient that exceeds 0.94, and
the roller coefficient=(Z·DA)/(π·PCD), where
Z is a number of said tapered rollers,
DA is a mean diameter of said tapered rollers, and
PCD is a pitch circle diameter of said tapered rollers.

### Claim 2 (depends on 1)

A tapered roller bearing as set forth in claim 1, wherein
a window angle of said pockets of said cage ranges from 55° to 80°.

### Claim 3 (depends on 1)

A tapered roller bearing as set forth in claim 1, wherein said cage is made of an engineering plastic.

### Claim 4 (depends on 1)

A tapered roller bearing as set forth in claim 1, wherein the tapered roller bearing is used for transmissions.

### Claim 5 (depends on 1)

A tapered roller bearing as set forth in claim 1, wherein the tapered roller bearing is used for differentials.

### Claim 6 (depends on 2)

A tapered roller bearing as set forth in claim 2, wherein said cage is made of an engineering plastic.

### Claim 7 (depends on 2)

A tapered roller bearing as set forth in claim 2, wherein the tapered roller bearing is used for transmissions.