Compressor

Abstract

An air bleeding passage 31 through which an intake chamber 7 and a crankcase 5 communicate with each other includes at least: a radial passage 31 b which is formed in the driving shaft 10 to be directed in the radial direction, and which indirectly communicates with the intake chamber 7 ; and a radial passage 31 a which is formed in a rotor 21 fixed to the driving shaft 10 by press-fitting to be directed in the radial direction, and through which the radial passage 31 b in the driving shaft 10 and the crankcase 5 are communicatively connected to each other. An inlet part 61 of the radial passage 31 a in the rotor 21 is configured as a cylinder-shaped part 61 protruding from the outer peripheral part 63 thereof, and is placed not to overlap a connecting mechanism 40 in the circumferential direction, the connecting mechanism 40 used for connecting the rotor 21 and a swash plate 24 to each other.

1 . A compressor, comprising:
 a driving shaft ( 10 );   a rotor ( 21 ,  121 ) fixed to an outer periphery of the driving shaft ( 10 ) by press-fitting;   an intake chamber ( 7 );   a crankcase ( 5 ); and   an air bleeding passage ( 31 ) through which the intake chamber ( 7 ) and the crankcase ( 5 ) communicate with each other,   wherein the air bleeding passage ( 31 ) comprises:
 a radial passage ( 31   b ,  131   b ) which is formed in the driving shaft ( 10 ) to be directed in a radial direction of the driving shaft ( 10 ), and which communicates with the intake chamber ( 7 ); and 
 a radial passage ( 31   a ,  131   a ) which is formed in the rotor ( 21 ,  121 ) to be directed in a radial direction of the rotor ( 21 ,  121 ), and through which the radial passage ( 31   b ,  131   b ) in the driving shaft ( 10 ) and the crankcase ( 5 ) are communicatively connected to each other, and 
   wherein an inlet part ( 61 ,  161 ) of the radial passage ( 31   a ,  131   a ) in the rotor ( 21 ,  121 ) is formed as a cylinder-shaped part ( 61 ,  161 ) protruding from an outer peripheral side ( 63 ,  163 ) of the rotor ( 21 ,  121 ).   
   
   
       2 . The compressor according to  claim 1 ,
 wherein the rotor ( 21 ,  121 ) is connected to a swash plate ( 24 ) provided in the crankcase ( 5 ) by a connecting mechanism ( 40 ); and   wherein the inlet part ( 61 ,  161 ) of the radial passage ( 31   a ,  131   a ) in the rotor ( 21 ,  121 ) is placed in a location where the inlet part ( 61 ,  161 ) does not overlap the connecting mechanism ( 40 ) in a circumferential direction of the rotor ( 21 ,  121 ).   
   
   
       3 . The compressor according to  claim 1 , wherein
 an outer peripheral surface of the cylinder-shaped part ( 61 ) includes an undercut part ( 61   a ) which gradually juts out from its base end toward its front end.   
   
   
       4 . The compressor according to  claim 1 , wherein
 a passage cross-section area of the radial passage ( 31   a ,  131   a ) in the rotor ( 21 ,  121 ) is smaller than that of the radial passage ( 31   b ,  131   b ) in the driving shaft ( 10 ).   
   
   
       5 . The compressor according to  claim 1 , further comprising:
 a communicating part ( 135 ) through which the radial passage ( 131   a ) in the rotor ( 121 ) and the radial passage ( 131   b ) in the driving shaft ( 10 ) communicate with each other, and the communicating part ( 135 ) being formed in any one of an outer peripheral surface of the driving shaft ( 10 ) and an inner peripheral surface of the rotor ( 121 ).   
   
   
       6 . The compressor according to  claim 5 ,
 wherein the radial passage ( 131   a ) in the rotor ( 121 ) is formed in a location offset from the radial passage ( 131   b ) in the driving shaft ( 10 ) in a rotational direction (R) of the rotor ( 121 );   thereby the radial passage ( 131   a ) communicates with the radial passage ( 131   b ) through the communicating part ( 135 ).   
   
   
       7 . The compressor according to  claim 6 , wherein
 the radial passage ( 131   a ) in the rotor ( 121 ) is arranged in a location offset from the radial passage ( 131   b ) of the driving shaft ( 10 ) in a direction reverse to the rotational direction (R) of the rotor ( 121 ).   
   
   
       8 . The compressor according to  claim 6 , wherein
 the radial passage ( 131   a ) in the rotor ( 121 ) includes a first radial passage ( 131   a   1 ) and a second radial passage ( 131   a   2 ) which are arranged in the rotational direction (R) of the rotor ( 121 ).   
   
   
       9 . The compressor according to  claim 8 , wherein
 a passage cross-section area of a minimum-diameter portion of the second radial passage ( 131   a   2 ) is set smaller than a passage cross-section area of a minimum-diameter portion of the first radial passage ( 131   a   1 ).   
   
   
       10 . The compressor according to  claim 8 , wherein
 the first radial passage ( 131   a   1 ) is arranged in a location offset from the radial passage ( 131   b ) of the driving shaft ( 10 ) in a direction reverse to the rotational direction (R) of the rotor ( 121 ), and   the second radial passage ( 131   a   2 ) is arranged in a location offset from the first radial passage ( 131   a   1 ) in the rotational direction (R) of the rotor ( 121 ).   
   
   
       11 . The compressor according to  claim 8 , wherein
 the second radial passage ( 131   a   2 ) is tapered in a way that a diameter of the second radial passage ( 131   a   2 ) becomes progressively larger toward its inner opening end on an inner-peripheral side of the rotor ( 121 ) from its outer opening end near to an outer-peripheral side of the rotor ( 121 ).   
   
   
       12 . The compressor according to  claim 11 , wherein
 the first radial passage ( 131   a   1 ) is tapered in a way that a diameter of the first radial passage ( 131   a   1 ) becomes progressively smaller toward its inner opening end on the inner-peripheral side of the rotor ( 121 ) from its outer opening end near to the outer peripheral side of the rotor ( 121 ).