PURPOSE: To enable stable oil supply to a thrust force support part by forming a plurality of oil grooves on a sliding surface of a thrust bearing for supplying lubricating oil through revolving of a revolving scroll member with equal pitches.
CONSTITUTION: A plurality of arcuate oil grooves 21 each having one end opened to a circular oil supply groove 20 are formed on a sliding surface with equal pitches. The centers of the circular arcs are dislocated from a center of a fixed scroll 5. The circular arcs wholly show a spiral form in the same direction of revolving operation of a revolving scroll. Lubricating oil 10 supplied to bearing parts by pressure difference is flowed into a back pressure chamber 9c, and into a space outside and plate 6b of the revolving scroll 6. The oil reserved in the circular oil supply groove 20 is supplied with certainty to a portion near a thrust force support part which requires lubrication most among the revolving scroll 6 and the fixed scroll 5 receiving the thrust force, through the arcuate oil grooves 21 by the revolving delay.
SEKIGAMI KAZUO
TAKEBAYASHI MASAHIRO
TSUBONO ISAMU
