Rotary expansible chamber devices – Working member has planetary or planetating movement – Helical working member – e.g. – scroll
Patent
1993-06-02
1994-02-01
Bertsch, Richard A.
Rotary expansible chamber devices
Working member has planetary or planetating movement
Helical working member, e.g., scroll
418 57, 418151, F01C 102, F01C 1063
Patent
active
052827283
ABSTRACT:
A scroll compressor (10) with a fixed scroll (18) and an orbital scroll (20) has an axial thrust and anti-rotation assembly (22), a drive assembly (24), a balance assemblly (26) and a control system (28). The drive assembly (24) includes a crankshaft (116) and a bushing assembly (108). The bushing assembly includes a bushing body (146) with a slot (154) journaled on the orbital scroll and a drive lug (150) positioned in the slot and non-rotatably secured to the crankshaft (116). Springs (156) bias the bushing body toward a position in which the axis of the bushing body (178) coincides with the axis (176) of the crankshaft and the crankshaft can rotate without moving the orbital scroll (20). The bushing body (146) can be moved by compressed fluid to a position in which the springs (156) are compressed, the scroll wraps (34 and 56) are in sealing contact and the drive assembly will drive the orbital scroll (20) in a circular orbit with a radius R. The balance assembly includes two weight assemblies (184 and 186) with four weights (192, 196, 210, and 214) that are rotated about the axis of a cylindrical extension (182) in response to movement of the drive lug (150) relative to the bushing body (146) between a position in which the orbital scroll is balanced and a position in which the weights balance themselves when the crankshaft (116) rotates without driving the orbital scroll.
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Bertsch Richard A.
Freay Charles G.
General Motors Corporation
Griffin Patrick M.
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