Swash plate type compressor

Abstract

A swash plate type compressor that has a pair of shoes between a swash plate and a piston. The motion of the swash plate is transmitted to the piston through the shoes. Each piston reciprocates according to the transmitted monitor. A coating is applied to each surface of the swash plate to contact the corresponding shoe. The surface of each coating is flat. Each shoe includes a substantially flat surface, which contacts the swash plate, and semi-spherical portion, which is fitted to the piston. Each substantially flat surface includes a main chamfered portion near the periphery. The inclination angle of each main chamfered portion will respect to the corresponding coating in a predetermined angle or less. Each coating contacts one of the substantially flat surfaces. The maximum distance between each main chamfered portion and the corresponding coating is equal to or less than the thickness of the corresponding coating.

1 . A swash plate type compressor, wherein at least a pair of shoes is provided between a swash plate and a piston, wherein motion of the swash plate is transmitted to the piston through the shoes, and the piston reciprocates according to the transmitted motion, wherein a coating in applied to each of two surfaces of the swash plate to contact the shoes, respectively, and the surface of each coating is flat, wherein each shoe includes a substantially flat surface and a semi-spherical portion, and each substantially flat surface contacts the swash plate, and each semi-spherical portion is fitted to the piston, wherein the substantially flat surface of each shoe includes a main chamfered portion, and the main chamfered portion is provided near the periphery of the substantially flat surface, and the inclination angle of each main chamfered portion with respect to the corresponding coating is a predetermined angle or less, wherein each coating contacts one of the substantially flat surface, and the maximum distance between each main chamfered portion and the corresponding coating is equal to or less than the thickness of the corresponding coating.  
     
     
         2 . The compressor according to  claim 1 , wherein each shoe includes a sub-chamfered portion, which surrounds the corresponding main chamfered portion, wherein the sub-chamfered portion is joined to the main chamfered portion, and wherein the inclination angle of the sub-chamfered portion with respect to the corresponding coating is greater than the predetermined angle.  
     
     
         3 . The compressor according to  claim 1 , wherein the predetermined angle of the inclination angle of each main chamfered portion is 20 degrees.  
     
     
         4 . The compressor according to  claim 1 , wherein each coating is formed of a metal layer and a resin layer, wherein the resin layer includes solid lubricant, and the resin layer is formed on the metal layer.  
     
     
         5 . The compressor according to  claim 4 , wherein the swash plate is made of iron-based material, and the metal layers are made of aluminum-based or copper-based material.  
     
     
         6 . The compressor according to  claim 1 , wherein the distance between each main chamfered portion and the corresponding coating gradually increases from the center of the corresponding substantially flat surface in a radially outward direction.  
     
     
         7 . The compressor according to  claim 1 , wherein each substantially flat surface is an arched surface, the vertex of which is at the center of the corresponding substantially flat surface.  
     
     
         8 . The compressor according to  claim 4 , wherein the metal layers are formed of metal that is softer than the material of the swash plate.  
     
     
         9 . A swash plate type compressor, wherein at least a pair of shoes is provided between a swash plate and a piston, wherein the motion of the swash plate is transmitted to the piston through the shoes, and the piston reciprocates according to the transmitted motion, wherein a coating is applied to each of two surfaces of the swash plate to contact the shoes, respectively, wherein each coating includes a metal layer and a resin layer found on the metal layer, wherein the resin layer includes solid lubricant, wherein each shoe includes a substantially flat surface and a semi-spherical portion, and each substantially flat surface contacts the swash plate, and each semi-spherical portion is fitted to the piston, wherein the substantially flat surface of each above includes a main chamfered portion and a sub-chamfered portion, the main chamfered portion being provided near the periphery of each substantially flat surface, wherein the sub-chamfered portion surrounds the main chamfered portion and is smoothly joined to the main chamfered portion, wherein the first inclination angle of each main chamfered portion with respect to the corresponding coating is a predetermined angle or less, wherein each coating contacts one of the substantially flat surfaces, wherein the second inclination angle of each sub-chamfered portion with respect to the corresponding coating is greater than the predetermined angle, and wherein the maximum distance between each main chamfered portion and the corresponding coating is equal to or less than the thickness of the corresponding coating.  
     
     
         10 . The compressor according to  claim 9 , wherein the predetermined angle of the first inclination angle of each main chamfered portion is 20 degrees.  
     
     
         11 . The compressor according to  claim 9 , wherein the swash plate is made of iron-based material, and the metal layers are made of aluminum-based or copper-based material.  
     
     
         12 . The compressor according to  claim 9 , wherein the distance between each main chamfered portion and the corresponding coating gradually increases from the center of the corresponding substantially flat surface in a radially outward direction.  
     
     
         13 . The compressor according to  claim 9 , wherein each substantially flat surface is an arched surface, the vertex of which is at the center of the corresponding substantially flat surface.  
     
     
         14 . The compressor according to  claim 9 , wherein the metal layers are formed of metal that is softer than the material of the swash plate.