Patent ID: 8371834

Claim:
A scroll fluid machine comprising: an eccentric drive mechanism including a casing; a rotary shaft rotatably provided inside the casing and including an eccentric hole formed to penetrate the rotary shaft to have an axis in parallel with an axis of the rotary shaft; a bearing; an eccentric shaft disposed through the eccentric hole via the bearing so that the eccentric shaft is orbited by rotating the rotary shaft; and an anti-self rotation mechanism for preventing a self-rotation of the eccentric shaft, the anti-self rotation mechanism including a long orbiting key, whose length is longer than a diameter of the eccentric shaft, formed at an end of the eccentric shaft, a ring including a long hole through which the orbiting key slides, and ring keys which extend toward both outer sides in a direction orthogonal to a longitudinal direction of the hole, and two key grooves formed in the casing, through which the ring keys slide.