Patent ID: 6736622
Filing Date: 2004-05-18
Classification: F04C

Abstract:
A scroll compressor comprising:a first scroll member having a base and a generally spiral wrap extending from said base; a second scroll member having a base and a generally spiral wrap extending from its base, a drive shaft having an eccentric pin for causing said second scroll member to orbit relative to said first scroll member, said wraps of said first and second scroll members interfitting to define compression chambers which are reduced in volume as the second scroll member orbits relative to said first scroll member; said wraps of said first and second scroll members each being formed from an origin on said first and second scroll members respectively, and each of said first and second scroll members having drive centers, said drive center of said first scroll member being defined as a central axis of said drive shaft and said drive center of said second scroll member being defined as a center axis of said eccentric pin; and said origin of each of said first and second scroll members being offset in a similar direction from said drive centers of said first and second scroll members, said offset being selected to reduce torque fluctuation and torque reversal during orbital motion of said second scroll member, and said wraps of said first and second scroll members being hybrid wraps, with variable thickness along a circumferential length of said wrap.