Rotary expansible chamber devices – Working member has planetary or planetating movement – Helical working member – e.g. – scroll
Patent
1996-08-21
1998-02-03
Vrablik, John J.
Rotary expansible chamber devices
Working member has planetary or planetating movement
Helical working member, e.g., scroll
418 556, 418 57, F01C 104, F01C 2104
Patent
active
057137315
ABSTRACT:
A scroll type fluid handling apparatus, such as a refrigeration compressor, has co-rotating driver and idler scroll members supported for rotation about offset, generally parallel axes. The idler scroll member has a support shaft which is supported on the compressor housing by a pivot bushing having an eccentric pivot axis which permits radially compliant movement of the idler scroll along a line of action which is predetermined to provide a component of a resultant force acting between the scroll members which will urge the idler scroll wrap into engagement with the driver scroll wrap under a wide range of operating conditions to enhance the contact line seal between the scroll wraps. The idler scroll support shaft may have a bearing bore sleeved over a bearing surface on the pivot bushing and the pivot bushing supported on a stub shaft of the housing, or the idler scroll support shaft may be disposed in a bearing bore formed in the bushing which, in turn, is mounted for limited rotation in a bearing bore formed in the housing stub shaft part. Cooperating stop surfaces between the pivot bushing and the housing stub shaft limit the radial excursion of the idler scroll and its support shaft with respect to the driver scroll. The idler scroll support shaft may also be mounted in a bushing disposed in a channel or supported on an elongated trunnion which provides for linear translation of the bushing, the support shaft and the idler scroll along the line of action and responsive to the resultant force.
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Lin Chih M.
Mackelfresh Michael P.
Utter Robert E.
Alliance Compressors
Martin Michael E.
Vrablik John J.
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