Variable compressor

Abstract

A variable capacity piston type compressor has a front housing, cylinder housing and rear housing. A rotary shaft may have a first end and a second end. The first end of the rotary shaft may be disposed through and rotatably supported by the front housing. The second end of the rotary shaft may be disposed through the cylinder block. The second end of the rotary shaft may also have a reduced diameter portion and a shoulder portion. A stopper may be inserted over the reduced diameter portion of the rotary shaft and abut the shoulder portion of the rotary shaft.

What is claimed is: 
     
         1 . A variable displacement compressor comprising:
 a front housing;   a cylinder block;   a rear housing; and   a rotary shaft with a first end and a second end, the first end of the rotary shaft disposed through the front housing, the second end of the rotary shaft disposed through the cylinder block, the second end of the rotary shaft having a reduced diameter portion and a shoulder portion, wherein a stopper is inserted over the reduced diameter portion and abuts the shoulder portion of the rotary shaft.   
     
     
         2 . A variable displacement compressor according to  claim 1 , further comprising a valve plate disposed between the cylinder block and rear housing. 
     
     
         3 . A variable displacement compressor according to  claim 2  wherein the stopper is spaced apart from the valve plate at a clearance. 
     
     
         4 . A variable displacement compressor according to  claim 3 , where the clearance is a range between 30-90 microns (μ). 
     
     
         5 . A variable displacement compressor according to  claim 1 , further comprising a swash plate rotated by the rotary shaft, the swash plate disposed on the shaft between the first end and second end. 
     
     
         6 . A variable displacement compressor according to  claim 5  further comprising:
 a plurality of cylinder bores formed in a cylinder housing; and 
 a plurality of pistons disposed in the cylinder bores, wherein the pistons have opposing semispherical recesses formed in an end of the plurality of pistons and a plurality of semispherical shoes fit into the semispherical recesses, where in the shoes abut the swash plate. 
 
     
     
         7 . A variable A/C compressor comprising:
 a front housing that forms a crank chamber;   a plurality of cylinder bores formed in a cylinder housing;   a shaft with a first end rotatably supported by the front housing and a second end that extends through the cylinder housing;   a valve plate located at an opposite side of cylinder housing from the crank chamber; and   a selected size stopper fitted over the second end of the shaft and abuts a shoulder on the shaft.   
     
     
         8 . A variable A/C compressor according to  claim 7 , further comprising:
 a rear housing, the rear housing located an opposite side of the valve plate from the cylinder housing.   
     
     
         9 . A variable A/C compressor according to  claim 8 , wherein the selected size stopper has an opening, a body and a flange portion. 
     
     
         10 . A variable A/C compressor according to  claim 9 , wherein the flange of the selected size stopper is spaced apart from the valve plate at a clearance. 
     
     
         11 . A variable A/C compressor according to  claim 10 , wherein the clearance is a range between 30-90 microns (μ). 
     
     
         12 . A method of assembly for a variable compressor, the method comprising:
 inserting a first end of a shaft through a front housing;   inserting a second end of the shaft through a cylinder housing;   measuring a distance between a shoulder of the second end of the shaft and a rear surfaces of the cylinder housing;   selecting a ranked stopper from an inventory that is sorted and ranked by varying lengths of the stopper; and   pressing the ranked stopper onto the second end of the shaft until the stopper abuts the shoulder of the shaft.   
     
     
         13 . A method of assembly for a variable compressor according to  claim 12  further comprising:
 placing valve plate on rear surface of cylinder block; 
 placing rear housing on valve plate; and 
 inserting bolts through front housing, cylinder block, the bolts engaging threads in the rear housing.