Patent ID: 7850438
Filing Date: 2010-12-14
Classification: F01C,F04C

Abstract:
1. A scroll fluid machine comprising a housing, an orbiting scroll supported in the housing so that it moves in an orbiting motion, an Oldham's ring preventing the rotation of the orbiting-scroll, a fixed member situated on the back side of the orbiting scroll and fixed to the housing, a back pressure chamber formed between the orbiting scroll and the fixed member and a sealing member situated between the fixed member and the orbiting scroll for sealing the back pressure chamber, the orbiting scroll having an Oldham's keyway formed along the edge of its back side for holding one end portion of the Oldham's ring slidably, wherein the sealing member has a tongue part that is formed so that when the orbiting of the orbiting scroll has caused the Oldham's keyway and the sealing member to overlap each other, the flow of any fluid remains cut off from the back pressure chamber to the Oldham's keyway.