Fixed displacement compressors

Abstract

A fixed displacement compressor includes a cylinder block having a plurality of cylinder bores formed therethrough, a drive shaft rotatably supported by the cylinder block, and a plate rotatably mounted on the drive shaft. Moreover, an inclination angle of the plate varies relative to a radial line perpendicular to the drive shaft. The compressor also includes a spring positioned adjacent to the plate. The spring is adapted to urge the plate in a direction which reduces the inclination angle of the plate. In an embodiment, the plate is a swash plate. In another embodiment, the compressor further includes a cam rotor fixed to the drive shaft. In this latter embodiment, the spring is positioned between the cam rotor the plate.

What is claimed is:  
     
         1 . A fixed displacement compressor comprising: 
 a cylinder block having a plurality of cylinder bores formed therethrough;    a drive shaft rotatably supported by said cylinder block;    a plate rotatably mounted on said drive shaft, wherein an inclination angle of said plate varies relative to a radial line perpendicular to said drive shaft; and    at least one spring positioned adjacent to said plate, wherein said spring is adapted to urge said plate in a direction which reduces said inclination angle of said plate.    
     
     
         2 . The compressor of  claim 1 , wherein said plate is a swash plate.  
     
     
         3 . The compressor of  claim 1 , wherein when said drive shaft is engaged, said inclination angle increases from a minimum inclination angle to a maximum inclination angle.  
     
     
         4 . The compressor of  claim 1 , wherein when said drive shaft is disengaged, said inclination angle deceases from a maximum inclination angle to a minimum inclination angle.  
     
     
         5 . The compressor of  claim 1 , further comprising a cam rotor fixed to said drive shaft, wherein said at least one spring is positioned between said cam rotor and said plate.  
     
     
         6 . The compressor of  claim 5 , wherein said plate is a swash plate.