Patent ID: 8136417

Claim:
A sliding device comprising a swash plate that is rotated in association with a rotating shaft and has a flat first sliding surface on at least one of its end surfaces and a shoe having a second sliding surface that slides on the first sliding surface of the swash plate, characterized in that a ferrous material is used as a base material for the shoe, a large number of minute hardened parts consisting of annular expandingly projecting parts are formed on the second sliding surface of the shoe having a higher hardness than the base material and one of the following items (a) to (e) is used as a material for the swash plate: (a) high-strength brass; (b) a ferrous basic material coated with a copper alloy; (c) an aluminum-silicon alloy; (d) a ferrous basic material coated with an aluminum-silicon alloy; and (e) a ferrous basic material, wherein each annular expandingly projecting part has an interior for storing a lubricating oil and an exterior forming a lubricating oil passageway for flowing the lubricating oil therethrough which both have lower hardnesses than the annular expandingly projecting part, wherein the height of the annular expandingly projecting parts is equal to the depth of the interior of the annular expandingly projecting parts and is from 0.05-0.3 μm.