Thrust ball bearing and open-type scroll compressor

摘要

A thrust ball bearing provided in an open scroll-type compressor can withstand a large compressive load on the bearing and prevents wear of the mating surfaces. The thrust ball bearing has a first thrust plate 9a for performing spiral revolution; a second thrust plate 4a opposing the first thrust plate 9a; and a retaining device 40 disposed between the thrust plates 4a, 9a and provided with retaining cavities 42 for retaining a ball 41 in each cavity; where a radius rho of spiral revolution of the first plate, a diameter d of the ball and a diameter D of the retaining cavity are related by an expression D≥d+ rho .