Patent ID: 6273692
Filing Date: 2001-08-14
Classification: F04C

Abstract:
A scroll-type compressor including a first scroll member and a second scroll member disposed for nonrotatable, orbital movement relative to said first scroll member, and a ball coupling provided as a rotation preventing mechanism for said second scroll member and having a pair of plates and a plurality of balls disposed between said plates, said pair of plates having ring-like ball rolling grooves for receiving said balls on respective surfaces facing each other, said compressor comprising:a driven crank mechanism creating a swing motion for producing an orbital movement of said second scroll member, a swing angle of said driven crank mechanism corresponding to a radius of said orbital movement of said second scroll member, said driven crank mechanism having a swing angle variation allowing mechanism for regulating a maximum amount of variation of said swing angle, said maximum amount of variation of said swing angle due to said swing angle variation allowing mechanism being set within a range predetermined in accordance with a diameter of a ring form of each of said ring-like ball rolling grooves.