Hermetic compressor

Abstract

A hermetic compressor includes a shaft having a connecting section formed between an eccentric shaft portion and a countershaft portion, the connecting section provided with an axial length sufficient for shifting a large end hole of a connecting rod to a position coaxial with the eccentric shaft portion. The shaft also has an extended surface of the eccentric shaft portion formed on the connecting section at one side opposite an eccentric axis thereof. This structure facilitates alignment of the center of axes of the eccentric shaft portion and the large end hole by simply sliding the extended surface of the shaft along a sliding surface of the large end hole, so as to ease insertion of the eccentric shaft portion into the large end hole, and prevent damages to the sliding surfaces of the eccentric shaft portion and the large end hole, thereby improving workability and productivity of assembling the shaft as well as reliability of the compressor.

1 . A hermetic compressor comprising:
 a compressor element enclosed in a hermetically sealed container, the compressor element including:   a cylinder block constituting a compression chamber of a substantially cylindrical shape;   a shaft having an eccentric shaft portion, a countershaft portion and a main shaft portion integrally-formed, the countershaft portion and the main shaft portion being formed in a coaxial manner with the eccentric shaft portion between them;   a countershaft bearing formed at the cylinder block for axially supporting the countershaft portion;   a main shaft bearing formed at the cylinder block for axially supporting the main shaft portion;   a piston for making reciprocating motion inside the compression chamber; and   a connecting rod for connecting the piston and the eccentric shaft portion, the connecting rod provided with a large end hole which is fitted to the eccentric shaft portion,   wherein a connecting section is formed between the eccentric shaft portion and the countershaft portion of the shaft, the connecting section has an axial length sufficient to allow the large end hole to move into a position coaxial with the eccentric shaft portion, and   wherein an extended surface of the eccentric shaft portion is formed at a side, which is opposite to an eccentric axis, of the connecting section.   
     
     
         2 . The hermetic compressor of  claim 1 ,
 wherein the extended surface of the eccentric shaft portion is processed simultaneously with a finishing process of the eccentric shaft portion, into a shape of circular are in cross section having a curvature equal to a curvature of an inner wall of the large end hole.   
     
     
         3 . The hermetic compressor of  claim 1 ,
 wherein a curved configuration is formed between the eccentric axis side of the connecting section and an end surface, which is a side of the countershaft portion, of the eccentric shaft portion.   
     
     
         4 . The hermetic compressor of  claim 1 ,
 wherein a curved configuration is formed between one side of connecting section opposite the eccentric axis side and an end surface, which is a side of the eccentric shaft portion, of the countershaft portion.   
     
     
         5 . The hermetic compressor of  claim 1 ,
 wherein the countershaft portion has an outer diameter of same size as an outer diameter of the eccentric shaft portion for fitting to the large end hole.   
     
     
         6 . The hermetic compressor of  claim 2 ,
 wherein a curved configuration is formed between the eccentric axis side of the connecting section and an end surface, which is a side of the countershaft portion, of the eccentric shaft portion.   
     
     
         7 . The hermetic compressor  claim 2 ,
 wherein a curved configuration is formed between one side of connecting section opposite the eccentric axis side and an end surface, which is a side of the eccentric shaft portion, of the countershaft portion.   
     
     
         8 . The hermetic compressor of  claim 2 ,
 wherein the countershaft portion has an outer diameter of same size as an outer diameter of the eccentric shaft portion for fitting to the large end hole.