Abstract: A rotary compressor includes a cylinder having a cylinder chamber and bush groove, a piston housed in the cylinder chamber, a blade formed with the piston to separate the cylinder chamber into low and high pressure chambers, and a pair of bushes. The bushes are fitted in the bush groove with flat surfaces facing each other to hold the blade. The flat surface of at least the bush on the low-pressure side has a crowned portion starting from a position closer to the back pressure space than a swing center position, and extending toward an edge of the bush closer to the cylinder chamber. The swing center position is where a gap between the blade and the bush is constant while the piston rotates eccentrically.

Abstract: A compressor includes a cylinder including a cylinder chamber, a piston movably arranged relative to the cylinder in the cylinder chamber, and a sliding member slideable against the cylinder and the piston in the cylinder chamber. The cylinder and the piston are constructed from an Al—Si alloy having a Si content exceeding 12.6 wt %, which is a eutectic point. The sliding member is constructed from steel and has a surface layer including a sliding surface slideable against the cylinder and the piston. The surface layer is treated so as to have greater hardness than hardness of proeutectic Si contained in the Al—Si alloy, and the surface layer has hardness of at least Hv 1000 in the sliding surface.

Abstract: A rotary compressor includes a cylinder having a cylinder chamber and bush groove, a piston housed in the cylinder chamber, a blade formed with the piston to separate the cylinder chamber into low and high pressure chambers, and a pair of bushes. The bushes are fitted in the bush groove with flat surfaces facing each other to hold the blade. The flat surface of at least the bush on the low-pressure side has a crowned portion starting from a position closer to the back pressure space than a swing center position, and extending toward an edge of the bush closer to the cylinder chamber. The swing center position is where a gap between the blade and the bush is constant while the piston rotates eccentrically.

Abstract: A compressor includes a cylinder including a cylinder chamber, a piston movably arranged relative to the cylinder in the cylinder chamber, and a sliding member slideable against the cylinder and the piston in the cylinder chamber. The cylinder and the piston are constructed from an Al—Si alloy having a Si content exceeding 12.6 wt %, which is a eutectic point. The sliding member is constructed from steel and has a surface layer including a sliding surface slideable against the cylinder and the piston. The surface layer is treated so as to have greater hardness than hardness of proeutectic Si contained in the Al—Si alloy, and the surface layer has hardness of at least Hv 1000 in the sliding surface.

Abstract: A sliding member has a porous sintered base and a resin composition. The porous sintered base is constructed of a porous sintered compact. The resin composition is coated onto the surface of the porous sintered base. The resin composition has a maximum resin layer thickness equal to a pore depth plus at least 10 ?m or more to the pore depth t2. The pore depth is a maximum depth of the pores exposed on the surface of the porous sintered base before the resin composition is coated onto the surface of the porous sintered base.

Abstract: In a scroll compressor (10), a lubrication part (70) is disposed in the slide portion of a cylindrical part (26) of a slide bush (25) and a projected part (53) of an orbiting scroll (50). The lubrication part (70) has, on the inner peripheral surface of an iron base material thereof, a coat layer composed of a sliding member forming composition. The sliding member forming composition comprises, per 100 parts by weight of polytetrafluoroethylene, (i) 300 parts by weight of polyamide-imide resin; (ii) 75 parts by weight of calcium fluoride as an antiwear agent; (iii) 25 parts by weight of aluminum oxide.

Abstract: A scroll compressor (10) includes a lubrication part (70) provided at a sliding part between a cylindrical part (26) of a slide bush (25) and an extension (53) of a movable scroll (50). The lubrication part (70) has a coating formed on the surface of an iron substrate and the coating is made of a composition for a sliding element containing polytetrafluoroethylene, 300 parts by weight of polyamide-imide resin per 100 parts by weight of polytetrafluoroethylene and 100 parts by weight of calcium fluoride as a wear resistant agent per 100 parts by weight of polytetrafluoroethylene.