Method for disassembling cryocooler

Abstract

A method for disassembling a cryocooler including a housing including a lower opening, a lower cover that closes the lower opening, a scotch yoke shaft that is accommodated in the housing and extends out of the housing by penetrating the lower cover, and a scotch yoke guide that is removably provided in the housing and guides axial movement of the scotch yoke shaft includes removing the lower cover from the housing, and taking the scotch yoke guide out of the housing from the lower opening.

What is claimed is: 
     
         1 . A method for disassembling a cryocooler, where the cryocooler includes a housing which includes a lower opening, a lower cover that closes the lower opening, a scotch yoke shaft that is accommodated in the housing and extends out of the housing by penetrating the lower cover, and a scotch yoke guide that is removably provided in the housing and guides axial movement of the scotch yoke shaft, the method comprising:
 removing the lower cover from the housing; and   taking the scotch yoke guide out of the housing from the lower opening.   
     
     
         2 . The method according to  claim 1 ,
 wherein the scotch yoke guide is configured to restrict rotation around an axis of the scotch yoke shaft.   
     
     
         3 . The method according to  claim 1 ,
 wherein the scotch yoke shaft includes a scotch yoke plate that is accommodated in the housing, and a rod extending out of the housing by penetrating the lower cover from the scotch yoke plate, and   wherein the scotch yoke guide is disposed at a position different from a position of the rod with respect to a direction of a motor rotary shaft that drives the axial movement of the scotch yoke shaft, and is adjacent to the scotch yoke plate.   
     
     
         4 . The method according to  claim 1 ,
 wherein the scotch yoke guide includes a plurality of pins extending in an axial direction of the scotch yoke shaft, and the housing includes a plurality of pin insertion holes into which the plurality of pins are removably inserted, respectively.   
     
     
         5 . The method according to  claim 1 , further comprising:
 pulling the scotch yoke shaft out of the housing from the lower opening before taking out the scotch yoke guide.   
     
     
         6 . The method according to  claim 1 ,
 wherein the cryocooler includes a displacer attached to the scotch yoke shaft, and   the method further comprises removing the displacer from the scotch yoke shaft before removing the lower cover from the housing.   
     
     
         7 . The method according to  claim 6 ,
 wherein the cryocooler includes a cylinder fixed to the housing and accommodating the displacer, and   the method further comprises
 releasing the fixation between the housing and the cylinder, and 
 pulling out the displacer from the cylinder together with the housing. 
   
     
     
         8 . The method according to  claim 1 ,
 wherein the cryocooler includes a motor that is attached to the housing and drives the axial movement of the scotch yoke shaft, and   the method further comprises removing the motor from the housing.