Patent ID: 7497673
Filing Date: 2009-03-03
Classification: F01C,F04C,F16C

Abstract:
1. A scroll fluid machine comprising: a driving shaft having an eccentric axial portion; a fixed scroll; and an orbiting scroll rotatably mounted to the eccentric axial portion of the driving shaft and engaging with the fixed scroll, the orbiting scroll having an axial hole, a gap being formed in the driving shaft between an outer circumferential surface of the eccentric axial portion and an inner circumferential surface of the axial hole, a first cooling path extending through the driving shaft to introduce a cooling gas into the gap, a second cooling path extending through the driving shaft to discharge the cooling gas from the gap, a forced convection generating portion sucking the cooling gas into the gas through the first cooling path and forwarding the gas to the second cooling path, the first cooling path comprising a first axial hole and a first radial hole connecting the first axial hole to the gap, the second cooling path comprising a second axial hole and a second radial hole connecting the gap to the second axial hole, the forced convection generating portion comprising a spiral groove on the outer circumferential surface of the eccentric axial portion of the driving shaft, the spiral groove being formed between the first and second radial holes on the outer circumferential surface of the eccentric axial portion of the driving shaft.