Swash plate type compressor

Abstract

A swash plate type compressor has a cylinder block, a drive shaft, a piston, a pair of first and second shoes and a swash plate. The swash plate has a first surface on the far side of the swash plate from the cylinder bore in slide contact with the first shoe and a second surface on the same side of the swash plate as the cylinder bore in slide contact with the second shoe. The swash plate has first and second edges formed between the first and second surfaces and an outer peripheral surface of the swash plate, respectively. The swash plate has a curved surface formed on the first edge at and adjacent to the bottom dead center of the swash plate whose radius of curvature is larger than that of the surface of the second edge.

1 . A swash plate type compressor comprising:
 a cylinder block having a plurality of cylinder bores;   a drive shaft supported by the cylinder block;   a piston accommodated in the cylinder bore;   a pair of a first shoe and a second shoe accommodated in the piston; and   a swash plate connected to the drive shaft so as to be rotated integrally with the drive shaft, connected to the piston through the first shoe and the second shoe, rotating integrally with the drive shaft and moving between the top dead center and the bottom dead center of the swash plate thereby to reciprocate the piston,   the swash plate having:
 a first surface on the far side of the swash plate from the cylinder bore in slide contact with the first shoe; 
 a second surface on the same side of the swash plate as the cylinder bore in slide contact with the second shoe; 
 a first edge formed between the first surface and an outer peripheral surface of the swash plate; 
 a second edge formed between the second surface and the outer peripheral surface of the swash plate; and 
 a curved surface formed on the first edge at and adjacent to the bottom dead center of the swash plate whose radius of curvature is larger than a radius of curvature of the surface of the second edge. 
   
   
   
       2 . The swash plate type compressor according to  claim 1 , wherein a coating layer is formed on the first surface and the first edge, and the coating layer on the first edge at and adjacent to the bottom dead center of the swash plate is formed thicker than the coating layer on the first surface. 
   
   
       3 . The swash plate type compressor according to  claim 1 , wherein the coating layer is made of resin. 
   
   
       4 . The swash plate type compressor according to  claim 1 , wherein the value of radius of curvature of the first edge at and adjacent to the bottom dead center of the swash plate is smaller than half the thickness of the swash plate. 
   
   
       5 . A swash plate type compressor comprising:
 a cylinder block having a plurality of cylinder bores;   a drive shaft supported by the cylinder block;   a piston accommodated in the cylinder bore;   a pair of a first shoe and a second shoe accommodated in the piston; and   a swash plate connected to the drive shaft so as to be rotated integrally with the drive shaft, connected to the piston through the first shoe and the second shoe, rotating integrally with the drive shaft and moving between the top dead center and the bottom dead center of the swash plate thereby to reciprocate the piston,   the swash plate having:
 a first surface on the far side of the swash plate from the cylinder bore in slide contact with the first shoe; 
 a second surface on the same side of the swash plate as the cylinder bore in slide contact with the second shoe; 
 a first edge formed between the first surface and an outer peripheral surface of the swash plate; 
 a second edge formed between the second surface and the outer peripheral surface of the swash plate; 
 a flat chamfered surface formed on the first edge at and adjacent to the bottom dead center of the swash plate; and 
 a coating layer formed on the first surface and the first edge whose thickness on the first edge at and adjacent to the bottom dead center of the swash plate is larger than the thickness on the first surface. 
   
   
   
       6 . The swash plate type compressor according to  claim 5 , wherein the coating layer is made of resin. 
   
   
       7 . The swash plate type compressor according to  claim 5 , wherein the compressor is a variable displacement compressor which is operable to vary the displacement of the compressor by adjusting the inclination angle of the swash plate relative to the drive shaft.