Patent ID: 6345967
Filing Date: 2002-02-12
Classification: F04C

Abstract:
A scroll type fluid machine comprising:an orbiting scroll having an end plate and a wrap stood on the end plate and orbiting within a surface perpendicular to an axial direction in a direction that the wrap is stood without rotating on its own axis; a fixed scroll having an end plate and a wrap stood on the end plate and structured such that a motion within the surface perpendicular to the axial direction is restricted; and a crank mechanism having a fixed amount of eccentricity, said crank mechanism being provided for orbiting said orbiting scroll, thereby reducing or expanding a volume formed by engaging the wraps of said fixed scroll and said orbiting scroll with each other so as to close between both of the scrolls, wherein a side surface clearance formed between both of said wraps is formed to be smaller in a range between a central winding start point of the wrap and a section close to a center of the wrap than in a range between the section close to the center of the wrap and a section close to an outer periphery of the wrap, and an orbiting shaft coupled with said orbiting scroll and said section close to the center of the wrap have an overlapping portion as seen from an axial direction.