Rotary expansible chamber devices – Working member has planetary or planetating movement – Helical working member – e.g. – scroll
Patent
1981-12-10
1983-11-15
Vrablik, John J.
Rotary expansible chamber devices
Working member has planetary or planetating movement
Helical working member, e.g., scroll
308235, F01C 102, F01C 2102, F16C 3338, F16C 4102
Patent
active
044153180
ABSTRACT:
A rolling thrust bearing for use in a scroll type positive fluid displacement apparatus is disclosed. In the invention, a plurality of ball bearings spaced apart in cavities formed in a bearing cage are operative to transmit an axial force between a supporting frame and an orbiting scroll member. The bearing cage rotates within a groove in which it is seated due to frictional forces between its flank surfaces and the sides of the groove. In a first embodiment, the diameter of the cavities is substantially larger than the diameter of the ball bearings, and the bearings are free to orbit within the cavities as the bearing cage rotates. In the second embodiment, the cavities are only slightly larger in diameter than the ball bearings, but the radial width of the bearing cage is substantially less than the width of the groove, and the bearing cage and the ball bearings together describe an epicycloidal path about the central axis of the bearing cage. In both embodiments, the ball bearings seated within the cavities contact adjacent bearing races over a constanty changing portion of their surface. This substantially extends the operational life of the thrust bearing.
REFERENCES:
patent: 3413047 (1968-11-01), Levishko
patent: 3600114 (1971-08-01), Dvorak et al.
patent: 3924977 (1975-12-01), McCullough
patent: 4160629 (1979-07-01), Hidden et al.
patent: 4259043 (1981-03-01), Hidden et al.
Butterworth Arthur L.
Eber David H.
Anderson Ronald M.
Campbell Raymond W.
Lewis Carl M.
The Trane Company
Vrablik John J.
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