Refrigerant compressors

Abstract

A refrigerant compressor includes a cylinder block, a front housing, and a sealing member. The cylinder block has a cylindrical portion. The cylindrical portion has an internal thread formed on an end thereof. The front housing having an external thread engages the internal thread. The front housing is fixed to the cylinder block and forms a crank chamber with the cylinder block. The pressure capacity of the refrigerant compressor may be increased without an increase in the size of the compressor.

What is claimed is:  
     
         1 . A refrigerant compressor comprising: 
 a cylinder block having a cylindrical portion, said cylindrical portion has an internal thread formed on an end thereof; and    a front housing having an external thread engaged by said internal thread, and said front housing fixed to said cylinder block and forming a crank chamber with said cylinder block.    
     
     
         2 . The refrigerant compressor of  claim 1 , further comprising: 
 a sealing member sealing a joint portion between said front housing and said cylinder block.    
     
     
         3 . The refrigerant compressor of  claim 1 , wherein a projecting portion is formed on an end of said cylinder block.  
     
     
         4 . The refrigerant compressor of  claim 1 , wherein a projecting portion is formed on an end of a peripheral portion of said front housing.  
     
     
         5 . The refrigerant compressor of  claim 1 , wherein a screw is pressedly fitted into an end surface of said cylinder block through said front housing.  
     
     
         6 . The refrigerant compressor of  claim 1 , wherein a joint portion is formed around an end of said front housing defines an axial line between said cylinder block and said front housing.  
     
     
         7 . The refrigerant compressor of  claim 1 , wherein a plurality of radial lubrication passages communicate between said crank chamber and said sealing member.  
     
     
         8 . The refrigerant compressor of  claim 1 , further comprising: 
 a cylinder head fixed to said cylinder block at an opposite side of said front housing by a plurality of bolts, said cylinder block forming a suction chamber and discharge chamber with said cylinder block; and    a plurality of mounting bosses for attaching to a vehicle formed on an outer surface of said cylinder block and said cylinder head.    
     
     
         9 . The refrigerant compressor of  claim 1 , wherein said refrigerant compressor is a piston-type compressor.  
     
     
         10 . A refrigerant compressor comprising: 
 a cylinder block having a cylindrical portion, said cylindrical portion has an external thread formed on an end thereof; and    a front housing having an internal thread which engages said internal thread, and said front housing fixed to said cylinder block and forming a crank chamber with said cylinder block.    
     
     
         11 . The refrigerant compressor of  claim 10 , further comprising: 
 a sealing member sealing a joint portion between said front housing and said cylinder block.    
     
     
         12 . The refrigerant compressor of  claim 10 , wherein a projecting portion is formed on an end of said cylinder block.  
     
     
         13 . The refrigerant compressor of  claim 10 , wherein a projecting portion is formed on an end of a peripheral portion of said front housing.  
     
     
         14 . The refrigerant compressor of  claim 10 , wherein a screw is pressedly fitted into an end surface of said cylinder block through said front housing.  
     
     
         15 . The refrigerant compressor of  claim 10 , wherein a joint portion is formed around an end of said front housing defines an axial line between said cylinder block and said front housing.  
     
     
         16 . The refrigerant compressor of  claim 10 , wherein a plurality of radial lubrication passages communicate between said crank chamber and said sealing member.  
     
     
         17 . The refrigerant compressor of  claim 10 , further comprising: 
 a cylinder head fixed to said cylinder block at an opposite side of said front housing by a plurality of bolts, said cylinder head forming a suction chamber and discharge chamber with said cylinder block; and    a plurality of mounting bosses for attaching to a vehicle formed on an outer surface of said cylinder block and said cylinder head.    
     
     
         18 . The refrigerant compressor of  claim 10 , wherein said refrigerant compressor is a piston-type compressor.