Wheel bearing apparatus

Patent metadata

Field	Value
Publication number	US-10087988-B2
Application number	US-201515312390-A
Country	US
Kind code	B2
Filing date	May 11, 2015
Priority date	May 26, 2014
Publication date	Oct 2, 2018
Grant date	Oct 2, 2018

Abstract

A wheel bearing apparatus for rotatably supporting a wheel includes an inner member having two rows of raceway grooves on its outer circumference, an outer member having two rows of raceway grooves on its inner circumference, and rolling elements interposed between the raceway grooves of the inner and outer members. The raceway grooves of the inner and outer members are formed by hardened steel cutting. In relation to at least the raceway groove on the outboard side out of the raceway grooves of the inner member, h/d exceeds 0.50 where h is the depth of the groove and d is the diameter of the rolling elements. This provides a wheel bearing apparatus being compact and capable of withstanding a high applied load without inviting an increase in the size of the bearing.

First claim

The invention claimed is:

1. A wheel bearing apparatus for rotatably supporting a wheel, comprising:
an inner member having two rows of raceway grooves on an outer circumference thereof;
an outer member having two rows of raceway grooves on an inner circumference thereof; and
a plurality of rolling elements interposed between the raceway grooves of the inner member and the raceway grooves of the outer member, wherein
the raceway grooves of the inner member and the raceway grooves of the outer member are formed by hardened steel cutting after a heat treatment, and
in relation to at least a raceway groove on an outboard side out of the raceway grooves of the inner member, h/d exceeds 0.50 where h is a depth of the groove and d is a diameter of the rolling elements.

2. The wheel bearing apparatus according to claim 1 , wherein, in relation to the raceway grooves of the outer member, h/d is 0.56 or smaller.

3. The wheel bearing apparatus according to claim 1 , wherein, among the raceway grooves of the outer member, a raceway groove on an outboard side is greater in depth than a raceway groove on an inboard side.

4. The wheel bearing apparatus according to claim 1 , wherein
the inner member includes a hub wheel,
the hub wheel has one of the two raceway grooves of the inner member, and
hh/d is 0.63 or smaller where hh is a depth of the one of the two raceway grooves of the inner member.

5. The wheel bearing apparatus according to claim 4 , wherein, in relation to the raceway grooves of the outer member, h/d is 0.56 or smaller.

6. The wheel bearing apparatus according to claim 1 , wherein hi/d is 0.63 or smaller where hi is a depth of the raceway grooves of the inner member and d is the diameter of the balls.

7. The wheel bearing apparatus according to claim 6 , wherein, in relation to the raceway grooves of the outer member, h/d is 0.56 or smaller.

8. The wheel bearing apparatus according to claim 6 , wherein
the inner member includes a hub wheel,
the hub wheel has one of the two raceway grooves of the inner member, and
hh/d is 0.63 or smaller where hh is a depth of the one of the two raceway grooves of the inner member.

9. The wheel bearing apparatus according to claim 8 , wherein, in relation to the raceway grooves of the outer member, h/d is 0.56 or smaller.

10. The wheel bearing apparatus according to claim 1 , wherein, in relation to the raceway grooves of the outer member, h/d exceeds 0.40.

11. The wheel bearing apparatus according to claim 10 , wherein, in relation to the raceway grooves of the outer member, h/d is 0.56 or smaller.

12. The wheel bearing apparatus according to claim 10 , wherein
the inner member includes a hub wheel,
the hub wheel has one of the two raceway grooves of the inner member, and
hh/d is 0.63 or smaller where hh is a depth of the one of the two raceway grooves of the inner member.

13. The wheel bearing apparatus according to claim 12 , wherein, in relation to the raceway grooves of the outer member, h/d is 0.56 or smaller.

14. The wheel bearing apparatus according to claim 10 , wherein hi/d is 0.63 or smaller where hi is a depth of the raceway grooves of the inner member and d is the diameter of the balls.

15. The wheel bearing apparatus according to claim 14 , wherein, in relation to the raceway grooves of the outer member, h/d is 0.56 or smaller.

16. The wheel bearing apparatus according to claim 14 , wherein
the inner member includes a hub wheel,
the hub wheel has one of the two raceway grooves of the inner member, and
hh/d is 0.63 or smaller where hh is a depth of the one of the raceway grooves of the inner member.

17. The wheel bearing apparatus according to claim 16 , wherein, in relation to the raceway grooves of the outer member, h/d is 0.56 or smaller.

Assignees

• Ntn Toyo Bearing Co Ltd

Inventors

• Umekida Mitsuru

Classifications

• F16C33/585 Primary

  of raceways, e.g. ribs to guide the rollers · CPC title

• F16C19/186

  with three raceways provided integrally on parts other than race rings, e.g. third generation hubs · CPC title

• F16C2326/02

  Wheel hubs or castors · CPC title

• B60B27/0094

  one or more of the bearing races are formed by the hub · CPC title

• B60B27/0005

  with ball bearings · CPC title