Shoe and the same for swash plate type compressor

Abstract

A shoe for use in a swash plate type compressor, interposed between a swash plate and a piston, has a plane sliding surface, a spherical sliding surface and a side surface. The plane sliding surface, which is substantially a plane, slides with respect to the swash plate. The spherical sliding surface, which is substantially a part of sphere surface, slides with respect to the piston. The side surface is provided between the plane sliding surface and the spherical sliding surface. The side surface includes a chamfered surface adjacent to the plane sliding surface. An angle between the chamfered surface and the extended plane sliding surface ranges from 20° to 80°.

What is claimed is:  
     
         1 . A shoe interposed between a swash plate and a piston in a swash plate type compressor, the shoe comprising: 
 a plane sliding surface, which is substantially a plane, sliding with respect to the swash plate;    a spherical sliding surface, which is substantially a part of sphere surface, sliding with respect to the piston; and    a side surface between the plane sliding surface and the spherical sliding surface, the side surface including a chamfered surface adjacent to the plane sliding surface;    wherein an angle between the chamfered surface and the extended plane sliding surface ranges from 20° to 80°.    
     
     
         2 . The shoe according to  claim 1 , wherein the angle between the chamfered surface and the extended plane sliding surface is 30° or above.  
     
     
         3 . The shoe according to  claim 2 , wherein the angle between the chamfered surface and the extended plane sliding surface is 40° or above.  
     
     
         4 . The shoe according to  claim 1 , wherein the angle between the chamfered surface and the extended plane sliding surface is 60° or below.  
     
     
         5 . The shoe according to  claim 4 , wherein the angle between the chamfered surface and the extended plane sliding surface is 50° or below.  
     
     
         6 . The shoe according to  claim 1  further comprising: 
 a rounded corner between the chamfered surface and the plane sliding surface.  
 
     
     
         7 . The shoe according to  claim 6 , wherein the radius of the curvature of the rounded corner is 0.05 mm or above.  
     
     
         8 . The shoe according to  claim 7 , wherein the radius of the curvature of the rounded corner is 0.1 mm or above.  
     
     
         9 . The shoe according to  claim 8 , wherein the radius of the curvature of the rounded corner is 0.15 mm or above.  
     
     
         10 . The shoe according to  claim 6 , wherein the radius of the curvature of the rounded corner is 0.5 mm or below.  
     
     
         11 . The shoe according to  claim 10 , wherein the radius of the curvature of the rounded corner is 0.4 mm or below.  
     
     
         12 . The shoe according to  claim 11 , wherein the radius of the curvature of the rounded corner is 0.3 mm or below.  
     
     
         13 . The shoe according to  claim 1  further comprising: 
 a base member made of aluminum series alloy.  
 
     
     
         14 . The shoe according to  claim 13 , wherein at least a part of the surface of the base member is coated with metal plating layer.  
     
     
         15 . The shoe according to  claim 1  further comprising: 
 a base member made of iron series alloy.  
 
     
     
         16 . A swash plate type compressor comprising: 
 a housing;    a drive shaft rotatably supported by the housing;    a swash plate operatively connected to the drive shaft;    a piston accommodated in the housing, the piston operatively connected to the swash plate; and    a pair of shoes interposed between the swash plate and the piston, each of the shoes including: 
 a plane sliding surface, which is substantially a plane, sliding with respect to the swash plate;  
 a spherical sliding surface, which is substantially a part of sphere surface, sliding with respect to the piston; and  
 a side surface between the plane sliding surface and the spherical sliding surface, the side surface including a chamfered surface adjacent to the plane sliding surface;  
 wherein an angle between the chamfered surface and the extended plane sliding surface ranges from 20° to 80°.  
   
     
     
         17 . The swash plate type compressor according to  claim 16 , wherein the swash plate includes a base member made of iron series alloy.  
     
     
         18 . The swash plate type compressor according to  claim 16 , wherein the is swash plate includes lubricant layers on surfaces sliding with respect to the shoes.  
     
     
         19 . The swash plate type compressor according to  claim 18 , wherein the swash plate includes a metal spraying layer made of one of aluminum, copper and alloys of them, the metal spraying layer is formed on the surfaces sliding with respect to the shoes, and the lubricant layer is formed on the surface of the metal spraying layer.