Rotary expansible chamber devices – Working member has planetary or planetating movement – Helical working member – e.g. – scroll
Patent
1996-05-23
1998-01-06
Vrablik, John J.
Rotary expansible chamber devices
Working member has planetary or planetating movement
Helical working member, e.g., scroll
464102, F01C 104, F16D 304
Patent
active
057047731
ABSTRACT:
A fluid displacement apparatus includes a housing having a fluid inlet and fluid outlet, and a pair of grooves disposed on an inner surface thereof. A fixed scroll is fixedly disposed within the housing and has a circular end plate from which a first spiral element extends into the interior of the housing. An orbiting scroll has a circular end plate from which a second spiral element extends and has a pair of grooves formed on the circular end plate. An Oldham coupling disposed between the orbiting scroll and the housing includes a ring, a pair of first engaging portions formed on the ring for engaging with the grooves on the end plate of the orbiting scroll and a pair of second engaging portions formed on the ring for engaging with the grooves disposed on the inner surface of the housing. The ring further comprises at least one ring portion subject to a compressive stress and at least one ring portion subject to a tensile stress. A cross sectional area of the at least one ring portion subject to compressive stress is smaller than a cross sectional area of the at least one ring portion subject to tensile stress. Accordingly, the fluid displacement apparatus has a light weight Oldham coupling which reduces noise and vibration during high speed operation.
REFERENCES:
patent: 4655696 (1987-04-01), Utter
patent: 4992033 (1991-02-01), Caillat et al.
patent: 5071329 (1991-12-01), Sano et al.
patent: 5320506 (1994-06-01), Fogt
patent: 5330385 (1994-07-01), Hotta et al.
patent: 5403172 (1995-04-01), Blass et al.
Sanden Corporation
Vrablik John J.
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