Patent ID: 6722861
Filing Date: 2004-04-20
Classification: F04C

Abstract:
A scroll compressor comprising:a first scroll; a second orbiting scroll being driven for orbital movement relative to said first scroll; a reversible electric motor, said motor being operable to be driven in one direction at a first speed of rotation and cause said orbiting scroll to cyclically orbit in a forward direction at a first rate which is approximately equal to said first speed, and said motor being operable to be rotated in an opposed direction at said first speed, said orbiting scroll being caused to move in said forward direction when said motor is driven in said opposed direction at a second rate which is different from said first rate by a mechanical transmission; and a ratchet arrangement that provides the difference in the first rate and the second rate, the ratchet arrangement comprising a crank movable by the motor and a crank eccentric driven by the crank, wherein the crank eccentric is operably coupled by at least one roller clutch to a shaft eccentric that drives the second scroll.