Patent ID: 6312236
Filing Date: 2001-11-06
Classification: F01C

Abstract:
A scroll compressor including:a fixed scroll having a fixed scroll end plate and a spiral fixed wrap on said fixed scroll end plate;a housing to which said fixed scroll end plate is secured;an orbiting scroll having an orbiting scroll end plate and a spiral orbiting wrap on said orbiting scroll end plate;a compression chamber formed by intermeshing said fixed wrap and said orbiting wrap;a drive mechanism comprising a shaft to drive said orbiting scroll and an orbiting member;a rotation preventing mechanism having an Oldham's ring disposed in parallel to said orbiting scroll end plate and permitting orbiting motion of said orbiting scroll relative to said fixed scroll while hampering its rotation;wherein said rotation preventing mechanism comprises:a first engagement mechanism disposed in between said Oldham's ring and said orbiting scroll and reciprocatingly movable only in a first radial direction; anda second engagement mechanism disposed in between said Oldham's ring and said housing and reciprocatingly movable only in a second radial direction substantially perpendicular to said first radial direction;said first engagement mechanism comprising:a pair of first key ways provided on said orbiting scroll end plate in the first radial direction; anda pair of first keys provided on said Oldham's ring, each of said first keys being respectively inserted and fitted in said first key ways and slidable along said first key ways;said second engagement mechanism comprising:a pair of second key ways provided on said housing in a second radial direction; anda pair of second keys provided on said Oldham's ring, each of said second keys being respectively inserted and fitted in said second key ways and slidable along said second key ways; andsaid Oldham's ring being provided with said first keys and second keys opposingly disposed on a rotated elliptical ring formed by rotating an elliptical ring, having the major axis and the minor axis respectively in said first radial direction and in said second radial direction, by a predetermined angle in the direction reverse to the direction of rotation of said shaft.