Scroll type fluid machine having a biased drive bush

Details Scroll type fluid machine having a biased drive bush Scroll type fluid machine having a biased drive bush

1995-05-30

1996-12-10

Vrablik, John J.

Rotary expansible chamber devices

Working member has planetary or planetating movement

Helical working member, e.g., scroll

418 57, 418151, F01C 104, F01C 1706

Patent

active

055825133

ABSTRACT:
In a low speed rotation, side surfaces of a spiral wrap of a swivel scroll are brought into pressing contact with side surfaces of a spiral wrap of a stationary scroll to thereby keep an air tight condition therebetween. When the orbiting swivelling speed of the swivel scroll exceeds the predetermined level, a predetermined gap is kept between the side surfaces of the spiral wrap of the swivel scroll and the side surfaces of the spiral wrap of the stationary scroll to thereby prevent the abnormal wear of the spiral wraps and to thereby suppress an increase of the consumption power. A counterweight is provided on a drive bush for generating a centrifugal force Fc which is greater than a centrifugal force Fs applied to the swivel scroll during the orbiting swivelling motion of the swivel scroll and which is directed in an opposite direction to that of the centrifugal force Fs. A spring member is provided for biasing the drive bush in a direction .theta. in which the orbiting swivelling radius is increased. Thus, the swivel scroll is shifted in a direction in which the orbiting swivelling radius is decreased when the orbiting swivelling speed exceeds the predetermined level.

REFERENCES:
patent: 3884599 (1975-05-01), Young et al.
patent: 3924977 (1975-12-01), McCullough
patent: 5040958 (1991-08-01), Arata et al.
patent: 5108274 (1992-04-01), Kakuda et al.
patent: 5328342 (1994-07-01), Ishii et al.

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