Bearing unit for wheel

• US 20060051007A1
• Filed: 10/22/2003
• Published: 03/09/2006
• Est. Priority Date: 10/25/2002
• Status: Active Grant

• Current Assignee: NSK Limited
• Original Assignee: NSK Limited
• Inventors: Ishikawa, Hiroaki
• Granted Patent: US 7,267,487 B2
• Time in Patent Office: Days
• US Class Current: 384/544
• CPC Class Codes: B60B 27/00 Hubs non-metallic B60B5/00; of high resiliency B60B9/00
• CPC Class Codes: F16C 33/32 Balls

Abstract

There is disclosed a bearing unit (5, 5a) for a wheel comprising a stationary race (6) having stationary race track surfaces (11a, 11b) on a peripheral surface on the stationary side thereof to be supported and fixed by a suspension system in its used state, a rotating race (8) having rotating race track surfaces (14a, 14b) on a peripheral surface on the rotating side so as to fix a wheel and a braking rotating member in its used state, and a plurality of balls (17) provided between the rotating race tracks and the stationary race tracks, wherein a standard value for the mutual difference in diameter between these balls is not more than 1.0 μm.

Claims

1. A bearing unit for a wheel comprising:

a stationary race having stationary race track surfaces on a peripheral surface on the stationary side thereof to be supported and fixed by a suspension system in its used state;

a rotating race having rotating race track surfaces on a peripheral surface on the rotating side so as to fix a wheel and a braking rotating member in its used state; and

a plurality of balls provided between said rotating race tracks and said stationary race tracks,

wherein a standard value for the mutual difference in diameter between these balls is not more than 1.0 μ

m.

2. A bearing unit for a wheel according to claim 1, wherein the standard value for the mutual difference in diameter between of the balls is not more than 0.5 μ

m.