Patent ID: 8033135

Claim:
A rotary-type fluid machine comprising: a closed casing having a bottom portion defining an oil reservoir; a rotary-type fluid mechanism provided in an upper portion of the closed casing, the rotary-type fluid mechanism having a cylinder forming a working chamber and a partitioning member, the working chamber partitioned into a suction side working chamber and a discharge side working chamber by the partitioning member; a shaft having therein an oil supply passage for supplying oil to the fluid mechanism, the shaft connected to the fluid mechanism and extending to the oil reservoir; an oil pump provided at a lower portion of the shaft; and an oil retaining portion for retaining oil, supplied by the oil pump through the oil supply passage, in a region around the fluid mechanism to allow the partitioning member of the fluid mechanism to be lubricated, the oil retaining portion formed so that a liquid level of the oil retained therein is positioned higher than a lower face of the partitioning member, wherein: the oil retaining portion is formed by an oil retention member disposed between an inner circumference surface of the closed casing and an outer circumference surface of the cylinder in a radial direction of the shaft, the oil retention member includes a cylindrical trunk portion surrounding the fluid mechanism circumferentially, and a canopy extending from the truck portion toward the center of the shaft, wherein the oil retention member is open at upper side of the canopy, the cylindrical trunk portion has an upper end that is positioned higher than the lower face of the partitioning member, and the oil that has overflowed the oil supply passage is retained by the cylindrical trunk portion and held in the region around the fluid mechanism.