Patent ID: 6113371
Filing Date: 2000-09-05
Classification: F01C

Abstract:
A scroll-type machine comprising, in combination:a non-orbiting scroll mounted within a housing and being rotationally fixed in position relative to the housing, having a spiral wrap and a pair of slots in a first surface thereof;an orbiting scroll having a spiral wrap nested with the spiral wrap of the fixed scroll and a pair of slots in a first surface thereof generally facing the first surface of the non-orbiting scroll;a motor for driving the orbiting scroll;a crankshaft having an eccentric pin formed on one end thereof, the eccentric pin operably engageable with the orbiting scroll, the crankshaft being rotatably driven by the motor; anda substantially ring-shaped Oldham coupling sandwiched axially between the non-orbiting scroll and the orbiting scroll and radially outbound of the spiral wraps of the fixed and orbiting scrolls, a first pair of keys extending axially from a first surface thereof slidingly engaging the slots of the non-orbiting scroll, and a second pair of keys extending axially from a second surface thereof slidingly engaging the slots of the orbiting scroll, wherein an inner radial surface of the Oldham coupling forms an irregular oval.