Patent ID: 6220841
Filing Date: 2001-04-24
Classification: F04C

Abstract:
A displacement type fluid machine comprising a pair of opposed end plates; a cylinder disposed between said end plates and having an inner wall surface having portions protruding inwardly; a rotating shaft; a displacer mounted for orbiting about a center of rotation of said rotary shaft and disposed between said end plates and within said cylinder and having an outer wall surface, wherein said outer wall surface of said displacer and an inner wall surface of said cylinder are shaped such that one space is provided by said inner wall surface of said cylinder and said outer wall surface of said displacer if a center of said displacer is located on the center of rotation of said rotating shaft, and a plurality of spaces defining working chambers are formed between said outer wall surface of said displacer and said inner wall surface of said cylinder when the center of said displacer is provided in a gyration position offset from the center of rotation of said rotating shaft; a suction port for introducing a fluid to one of said working chambers, a discharge port for discharging said fluid from said one of said working chambers; and an oil-feeding system for intermittently feeding a lubricating oil to the outer wall surface on the suction port side of said displacer and the inner wall surface of said cylinder opposite to said outer wall surface.