# US 8,783,964 B2 · Bearing device for driving wheel

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- Number: US 8,783,964 B2
- Document ID: US8783964B2
- Status: Granted
- Kind: B2
- Application number: 14/050,685
- Filed: 2013-10-10
- Published: 2014-02-06
- Granted: 2014-07-22
- Earliest claimed: 2008-03-25
- Assignees: Ntn Corporation
- Applicants: Minoru Ishijima; Hiroshi Teduka; Manabu Hoshino; Kazuhiro Muramatsu
- Inventors: Minoru Ishijima; Hiroshi Teduka; Manabu Hoshino; Kazuhiro Muramatsu
- Web page: https://patentgrep.com/patent/US8783964B2

## CPC

- F16D 1/108: having retaining means rotating with the coupling and acting by interengaging parts, i.e. positive coupling
- B60B 7/00: Wheel cover discs, rings, or the like, for ornamenting, protecting {, venting,} or obscuring, wholly or in part, the wheel body, rim, hub, or tyre sidewall {, e.g. wheel cover discs, wheel cover discs with cooling fins (wheels with cooling fins not provided on the wheel cover disc B60B19/10; apparatus or tools for removing or attaching cover discs hub caps or the like B60B31/06)}
- B60B 7/066: {to the hub}
- B60B 27/0005: {with ball bearings}
- B60B 27/0026: {of the radial type, e.g. splined key}
- B60B 27/0084: {caulking to fix inner race}
- F16C 35/073: between shaft and inner race ring
- F16D 3/223: the rolling members being guided in grooves in both coupling parts
- F16C 19/185: {with two raceways provided integrally on a part other than a race ring, e.g. a shaft or housing}
- F16C 19/186: {with three raceways provided integrally on parts other than race rings, e.g. third generation hubs}
- F16C 19/527: {related to vibration and noise}
- F16C 35/0635: {the bore of the inner ring being of special non-cylindrical shape which co-operates with a complementary shape on the shaft, e.g. teeth, polygonal sections}
- F16C 2326/02: Wheel hubs or castors
- F16D 2001/103: {the torque is transmitted via splined connections}
- F16D 2003/22326: {Attachments to the outer joint member, i.e. attachments to the exterior of the outer joint member or to the shaft of the outer joint member}
- F16D 2300/10: Surface characteristics; Details related to material surfaces
- F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- B60B: VEHICLE WHEELS (making wheels or wheel parts by rolling B21H1/00, by forging, hammering or pressing B21K1/28); CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS

## Abstract

A driving-wheel bearing device includes an outer race having double-row outer raceway surfaces formed on an inner periphery thereof, a hub wheel and an inner race having a wheel attachment flange at one end thereof and double-row inner raceway surfaces on an outer periphery thereof, and double-row rolling elements interposed between the outer raceway surfaces of the outer race and the inner raceway surfaces of the hub wheel and the inner race, the hub wheel having a shaft hole into which a stem section extending from an outer joint member of a constant velocity universal joint is spline-fitted by being press-fitted, in which a plate having a molybdenum coating layer or a fluorine-resin coating layer formed thereon and having a plate thickness ranging from 0.5 mm to 2 mm is interposed between opposite surfaces of a shoulder portion of the outer joint member and an crimped portion of the hub wheel.

## Claims

### Claim 1

A driving-wheel bearing device, comprising:
an outer member having a shoulder portion, and double-row outer raceway surfaces on an inner periphery thereof;
an inner member comprising a hub wheel and an inner race, the inner member having a crimped end portion, a wheel attachment flange at one end thereof and double-row inner raceway surfaces on an outer periphery thereof; and
double-row rolling elements interposed between the double-row outer raceway surfaces of the outer member and the double-row inner raceway surfaces of the inner member,
wherein the hub wheel has a shaft hole into which a stem section extending from an outer joint member of a constant velocity universal joint is capable of being spline-fitted by being press-fitted,
wherein a plate having predetermined sliding properties is interposed between opposite surfaces of a shoulder portion of the outer joint member and the crimped end portion of the inner member,
wherein claw-like protrusions are provided on an inner periphery of the plate,
wherein an inner end portion of each of the claw-like protrusions is formed in a shape of being bent to the crimped end portion of the inner member,
wherein an inner diameter d1 corresponding to the claw-like protrusions of the plate is bigger than an outer diameter D2 of a portion to which the inner periphery of the plate is fitted, and
wherein an inner diameter of the inner periphery of the plate other than where the claw-like protrusions are located is bigger than the inner diameter d1 corresponding to the claw-like protrusions.

### Claim 2 (depends on 1)

A driving-wheel bearing device according to claim 1, wherein the portion to which the inner periphery of the plate is fitted is a recess groove formed on the shoulder portion of the outer joint member.

### Claim 3 (depends on 2)

A driving-wheel bearing device according to claim 2, wherein an outer diameter D1 of an inlet portion of the recess groove is bigger than the inner diameter d1 corresponding to the claw-like protrusions of the plate.

### Claim 4 (depends on 3)

A driving-wheel bearing device according to claim 3, wherein an axial length L of a groove-bottom portion of the recess groove is bigger than a thickness t of the plate.

### Claim 5 (depends on 2)

A driving-wheel bearing device according to claim 2, wherein an axial length L of a groove-bottom portion of the recess groove is bigger than a thickness t of the plate.