Rotation preventing mechanism using thrust ball bearing and scro

Details Rotation preventing mechanism using thrust ball bearing and scro Rotation preventing mechanism using thrust ball bearing and scro

1999-08-04

2000-11-21

Denion, Thomas

Rotary expansible chamber devices

Working member has planetary or planetating movement

Helical working member, e.g., scroll

464103, F04C 1800

Patent

active

061494127

ABSTRACT:
A rotation preventing mechanism is composed of a thrust ball bearing including a first race section having an annular shape, a second race section disposed at an eccentric position in confrontation with the first race section at intervals and thrust balls interposed between the first and second race sections. The first and second race sections have ball accommodating grooves formed at the confronting surfaces thereof, respectively. Each of the ball accommodating grooves includes a central portion and a groove bottom portion around it. When the radius of curvature of each thrust ball is represented by RB, the radius of curvature of the groove bottom portion on an inner side is represented by Rin and the radius of curvature thereof in an outer side is represented by Rout, and the ball accommodating groove has a shape satisfying a formula RB.ltoreq.Rin<Rout.

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