Patent ID: 8628313

Claim:
A scroll fluid machine comprising: a casing; a fixed scroll, fixed in the casing, and having a fixed scroll end plate formed thereon with a fixed scroll spiral wrap portion that has an inner peripheral surface and an outer peripheral surface; and an orbiting scroll, positioned facing the fixed scroll, and having an orbiting scroll end plate formed thereon with an orbiting scroll spiral wrap portion, which has an inner peripheral surface and an outer peripheral surface and which overlaps with the fixed scroll spiral wrap portion so as to define therebetween a plurality of compression chambers; wherein, at least one of the inner peripheral surface and the outer peripheral surface of one of the fixed scroll spiral wrap portion and the orbiting scroll spiral wrap portion has a plurality of projections; the peripheral surface, which faces the projections, of the other one of the fixed scroll spiral wrap portion and the orbiting scroll spiral wrap portion is coated thereover with a coating material so as to form a coating layer; and the coating layer has a thickness that is limited to a range above a value of a separation between the projections and said peripheral surface, which faces the projections, of the other one of the fixed scroll spiral wrap portion and the orbiting scroll spiral wrap portion, and below a value of separation between the parts, excluding the projections, of the peripheral surface, which is formed thereon with the projections, of the one of the fixed scroll spiral wrap portion and the orbiting scroll spiral wrap portion, and said peripheral surface, which faces the projections, of the other one of the fixed scroll spiral wrap portion and the orbiting scroll spiral wrap portion, as viewed when the orbiting scroll comes closest to the fixed scroll.