Displacement control valve for variable displacement compressor

Abstract

A displacement control valve for a variable displacement compressor has a control passage, a valve hole formed in the control passage, a first shaft portion including a valve body, and a connecting portion connected to the end portion of the valve body. The control passage is connected to a crank chamber for controlling the pressure in the crank chamber for adjusting the discharge displacement of the compressor. The valve body is formed at an end portion of the first shaft portion to open and close the valve hole. The connecting portion connected to the end portion of the valve body is disposed into the valve hole, and a circumferential surface of the connecting portion has a curved surface so as to be flared out at an end of the connecting portion.

1 . A displacement control valve for a variable displacement compressor that adjusts the discharge displacement by controlling the pressure in a crank chamber, the displacement control valve comprising:
 a control passage connected to the crank chamber for controlling the pressure in the crank chamber;   a valve hole formed in the control passage;   a first shaft portion including a valve body at an end portion thereof to open and close the valve hole; and   a connecting portion connected to the end portion of the valve body, so that the connecting portion is disposed into the valve hole, wherein a circumferential surface of the connecting portion has a curved surface so as to be flared out at an end of the connecting portion adjacent to the valve body.   
   
   
       2 . The displacement control valve for a variable displacement compressor according to  claim 1 , wherein the curved surface is formed with an arc. 
   
   
       3 . The displacement control valve for a variable displacement compressor according to  claim 1 , wherein the curved surface is connected to a circumferential edge of the end portion of the valve body. 
   
   
       4 . The displacement control valve for a variable displacement compressor according to  claim 1 , wherein a valve seat is formed around the valve hole, wherein the valve body has a plane end surface adjacent to the connecting portion, wherein the plane end surface of the valve body makes contact with the valve seat to close the valve hole. 
   
   
       5 . The displacement control valve for a variable displacement compressor according to  claim 1  further comprising a second shaft portion connected to the connecting portion. 
   
   
       6 . The displacement control valve for a variable displacement compressor according to  claim 5 , wherein a diameter of an end of the connecting portion adjacent to the valve body is larger than a diameter of an end of the connecting portion adjacent to the second shaft portion. 
   
   
       7 . The displacement control valve for a variable displacement compressor according to  claim 5 , wherein a step is formed by the connecting portion and the second shaft portion. 
   
   
       8 . The displacement control valve for a variable displacement compressor according to  claim 5  further comprising a pressure sensing mechanism for moving the valve body. 
   
   
       9 . The displacement control valve for a variable displacement compressor according to  claim 1  further comprising a solenoid for moving the valve body.