Patent ID: 7713038

Claim:
A scroll fluid machine comprising: a driving shaft comprising an eccentric axial portion at one end with a bearing; a housing comprising an intake port, a discharge port, a plurality of bosses and a plurality of ribs which project from a vertical wall of the housing concentrically with the bearing to connect the plurality of bosses to each other, the plurality of ribs guiding external air introduced through the intake port toward the bearing of the eccentric axial portion to allow the air to cool the bearing; an orbiting scroll rotatably mounted around the eccentric axial portion of the driving shaft via the bearing and having an orbiting wrap; a fixed scroll fixed to the housing and having a fixed wrap that engages with the orbiting wrap to form a sealed chamber between the fixed wrap and the orbiting wrap; and a plurality of self-rotation-preventing devices that prevent the orbiting scroll from rotating on its own axis, each of the plurality of self-rotation-preventing devices comprising a crank pin in each of the plurality of bosses of the housing.