Patent ID: 7785088

Claim:
A scroll fluid machine comprising: a first scroll having a first wrap portion spirally wound on and projecting from a first end plate in an axial direction; and a second scroll positioned to face the first scroll and including a second wrap portion that projects from a second end plate in the axial direction, the second wrap portion being spirally wound to overlap the first wrap portion of the first scroll and define a plurality of compression chambers; wherein: at least one of an inner peripheral surface and an outer peripheral surface of the first wrap portion of the first scroll includes a plurality of first projections that are spaced apart from each other in a winding direction of the first wrap portion, and extend in the axial direction, and a coating layer made of a coating material which is continuously formed; one of an inner peripheral surface and an outer peripheral surface of the second wrap portion of the second scroll that faces the coating layer is formed to be a smooth surface; the coating layer comprises i) a first contact portion disposed on each of the first projections and contacting the smooth surface; and ii) a first non-contact portion that is positioned between the contact portion of adjacent first projections, and does not contact the smooth surface; and a thickness C 1 of the coating layer is set to satisfy the expression B1<C1<A1, in which A 1 represents a separation between the peripheral surface of the first scroll, excluding the first projections, and the smooth surface of the second scroll, and B 1 represents a separation between the first projections on the coating layer formed on the first scroll excluding the coating layer and the smooth surface of the second scroll at a point at which the first scroll comes closest to the second scroll.