# US 10,767,689 B2 · Bearing device for vehicle wheel

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- Number: US 10,767,689 B2
- Document ID: US10767689B2
- Status: Granted
- Kind: B2
- Application number: 16/494,018
- Filed: 2018-03-14
- Published: 2020-01-23
- Granted: 2020-09-08
- Earliest claimed: 2017-03-16
- Assignees: Ntn Corporation
- Applicants: Ntn Corporation
- Inventors: Makoto Seki
- Web page: https://patentgrep.com/patent/US10767689B2

## CPC

- B60B 27/0078: {characterised by the fixation of bearings}
- F16C 19/385: {with two rows, i.e. double-row tapered roller bearings}
- B60B 27/001: {with roller-bearings}
- F16C 19/386: {in O-arrangement}
- F16C 33/58: Raceways; Race rings
- F16C 33/581: {integral with other parts, e.g. with housings or machine elements such as shafts or gear wheels}
- F16C 33/7823: {of sealing lips}
- F16C 33/7826: {of the opposing surface cooperating with the seal, e.g. a shoulder surface of a bearing ring}
- B60B 27/0015: {for driven wheels}
- B60B 27/0094: {one or more of the bearing races are formed by the hub}
- B60B 35/14: composite or split, e.g. half- axles; Couplings between axle parts or sections
- F16C 2240/50: Crowning, e.g. crowning height or crowning radius
- F16C 2240/70: Diameters; Radii
- F16C 2326/02: Wheel hubs or castors
- 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

This bearing device (1) for vehicle wheels comprises: an inner undercut part (8) provided in a portion at which an inner rolling surface (3d) formed on the inner side of an inner member (3) and an inner flange surface (3m) of the inner rolling surface (3d) intersect; an outer undercut part (9) provided in a portion at which an inner rolling surface (3c) formed on the outer side of the inner member (3) and an outer flange surface (3n) of the inner rolling surface (3c) intersect; and a vehicle wheel installation flange (3e) provided at a portion adjacent to the inner rolling surface (3c) formed on the outer side of the inner member (3), wherein, when the radius of curvature of the inner undercut part (8) is Ri, and the radius of curvature of the outer undercut part (9) is Ro, the relationship of Ri<Ro is satisfied.

## Claims

### Claim 1

A bearing device for vehicle wheel comprising:
an outer member having double-row outer rolling surfaces formed on an inner periphery;
an inner member having double-row inner rolling surfaces formed on an outer periphery;
a plurality of rolling elements rollably interposed between each of the outer rolling surfaces of the outer member and a corresponding one of the inner rolling surfaces of the inner member;
an inner-side undercut part provided at a portion where the inner rolling surface formed on an inner side of the inner member and an inner-side flange surface of the inner rolling surface intersect;
an outer-side undercut part provided at a portion where the inner rolling surface formed on an outer side of the inner member and an outer-side flange surface of the inner rolling surface intersect; and
a vehicle wheel installation flange provided adjacent to the inner rolling surface formed on the outer side of the inner member,
wherein a radius of curvature of the inner-side undercut part defined as Ri and a radius of curvature of the outer-side undercut part defined as Ro satisfy a relation of Ri<Ro.

### Claim 2 (depends on 1)

The bearing device for vehicle wheel according to claim 1, wherein the radius of curvature of the inner-side undercut part defined as Ri and the radius of curvature of the outer-side undercut part defined as Ro satisfy a relation of 1.2×Ri<Ro<2.5×Ri.

### Claim 3 (depends on 1)

The bearing device for vehicle wheel according to claim 1, wherein a height dimension of a portion where a large diameter end surface of each of the rolling elements and the inner-side flange surface are in contact with each other defined as Di and a height dimension of a portion where the large diameter end surface of each of the rolling elements and the outer-side flange surface are in contact with each other defined as Do satisfy a relation of Di=Do.

### Claim 4 (depends on 2)

The bearing device for vehicle wheel according to claim 2, wherein a height dimension of a portion where a large diameter end surface of each of the rolling elements and the inner-side flange surface are in contact with each other defined as Di and a height dimension of a portion where the large diameter end surface of each of the rolling elements and the outer-side flange surface are in contact with each other defined as Do satisfy a relation of Di=Do.