Scroll type fluid machine having first and second bearings for the

Abstract

An oil-free type fluid machine with scrolls is disclosed, which contains a fixed scroll composed of a fixed scroll swirl, a fixed scroll base and a casing, an orbiting scroll composed of an orbiting scroll swirl, an orbiting scroll base and an orbiting scroll boss, the fixed scroll and the orbiting scroll interposed one another, a driving shaft, an eccentric driving shaft provided on the driving shaft with a predetermined eccentricity S, which penetrates the orbiting scroll boss and the fixed scroll base, the orbiting scroll performs an orbiting motion as opposed to the fixed scroll to form a compression room by the orbiting scroll and the fixed scroll, a member for preventing the orbiting scroll from rotating on the driving shaft, a first bearing for supporting the driving shaft, a second bearing for supporting the eccentric driving shaft at an end which is not adjacent to the driving shaft, a bearing shoe concentrically provided with respect to the driving shaft, around the eccentric driving shaft and inside the second bearing for obtaining a bilateral bearing structure, a shim provided on an end face of the first bearing, and a wave washer provided at an end face of the second bearing, the shim and the wave washer provided for appropriately adjusting and maintaining spaces formed by the fixed scroll and the orbiting scroll in the thrust direction.