Patent ID: 6808373
Filing Date: 2004-10-26
Classification: F04C

Abstract:
A scroll fluid machine comprising:a first scroll member having a wrap portion projecting axially from an end plate, said wrap portion being wound spirally from a radially inner side toward a radial outer side of said end plate; and a second scroll member provided facing said first scroll member, said second scroll member having a wrap portion projecting axially from an end plate, said wrap portion being wound spirally from a radially inner side toward a radially outer side of said end plate so as to overlap the wrap portion of said first scroll member to define a plurality of compression chambers; wherein at least one of said scroll members has on a peripheral surface of the wrap portion thereof a plurality of axially extending projections at spacings in a spiral direction of said wrap portion, said projections each having a transverse sectional configuration defined by a top of the projection and slopes connecting the top to said peripheral surface, each of said slopes having a concave surface at a portion thereof that is contiguous to said peripheral surface, and wherein said projections are provided only on either one of mutually opposing inner and outer peripheral surfaces of the wrap portions of said first and second scroll members and the other of said mutually opposing peripheral surfaces is a smooth surface without any projections or recesses.