Variable displacement type compressor

Abstract

A first swash plate 18 is coupled to a drive shaft 16 to be rotatable integrally with the drive shaft 16 . Single head pistons 23 are coupled to the first swash plate 18 via shoes 25 A, 25 B. Rotation of the drive shaft 16 rotates the first swash plate 18 , which causes the pistons 23 to reciprocate and compress refrigerant gas. The first swash plate 18 supports an annular second swash plate 51 to be rotatable relative to the first swash plate 18 via a ball bearing 52 . The second swash plate 51 is arranged between the first swash plate 18 and the shoes 25 B that receive a compressive load to be slidable with respect to the first swash plate 18 and the shoes 25 B. Inclined surfaces (chamfers) are provided on salient corners 18 b , 18 c of the first swash plate 18 . Therefore, the durability of the swash plates and the shoes are improved.

1 . A variable displacement swash plate type compressor, comprising a drive shaft, a swash plate coupled to the drive shaft to be rotatable integrally with the drive shaft, pistons coupled to the swash plate via shoes, rotation of the drive shaft rotates the swash plate, which causes the pistons to reciprocate and compress gas, and the displacement is changed by varying the inclination angle of the swash plate, and 
 an inclined surface provided at part of the entire outer circumferential edge portion of the swash plate.    
   
   
       2 . The compressor according to  claim 1 , wherein part of the outer circumferential edge portion of the swash plate corresponding to the piston located at the top dead center position is provided with the inclined surface on a salient corner opposite to the piston.  
   
   
       3 . The compressor according to  claim 1 , wherein part of the outer circumferential edge portion of the swash plate corresponding to the piston located at the bottom dead center position is provided with the inclined surface on a salient corner toward the piston.  
   
   
       4 . The compressor according to  claim 1 , wherein the swash plate includes a first swash plate, which is coupled to the drive shaft to be rotatable integrally with the drive shaft, and a second swash plate supported by the first swash plate, the pistons are coupled to the first and second swash plates via first shoes, which abut against the first swash plate, and second shoes, which abut against the second swash plate and receive a reaction force of compression, and part of the outer circumferential edge of the first swash plate corresponding to the piston located at the top dead center position is provided with the inclined surface on a salient corner opposite to the second swash plate.  
   
   
       5 . The compressor according to  claim 4 , wherein part of the outer circumferential edge portion of the first swash plate corresponding to the piston located at the bottom dead center position is provided with the inclined surface on a salient corner toward the second swash plate.  
   
   
       6 . The compressor according to  claim 1 , wherein the gas is refrigerant used in a refrigeration circuit, and carbon dioxide is used as the refrigerant.  
   
   
       7 . A variable displacement swash plate type compressor, comprising 
 a drive shaft,    a swash plate coupled to the drive shaft to be rotatable integrally with the drive shaft,    pistons coupled to the swash plate via shoes, rotation of the drive shaft rotates the swash plate, which causes the pistons to reciprocate and compress gas, and the displacement is changed by varying the inclination angle of the swash plate,    a first inclined surface provided at part of the outer circumferential edge portion of the swash plate corresponding to the piston located at the top dead center position on a salient corner opposite to the piston, and    a second inclined surface provided at part of the outer circumferential edge portion of the swash plate corresponding to the piston located at the bottom dead center position on a salient corner toward the piston.