Double-headed piston type swash plate compressor

Abstract

A double-headed piston type swash plate compressor includes a housing and a rotary shaft. The housing defines a swash plate chamber and includes a cylinder block, a front housing member coupled to a front end of the cylinder block, and a rear housing member coupled to a rear end of the cylinder block. The rotary shaft is supported by the housing. A protrusion is provided in a suction chamber of the rear housing member and protrudes toward an opening of an axial passage formed in the rotary shaft. A restrictor through which refrigerant passes when flowing from the suction chamber to the axial passage is formed between the protrusion and the rear end of the rotary shaft. The protrusion has a distal end sized such that the distal end can be inserted in the opening of the axial passage.

1 . A double-headed piston type swash plate compressor, comprising:
 a housing defining a swash plate chamber, wherein the housing includes a cylinder block, a front housing member coupled to a front end of the cylinder block, and a rear housing member coupled to a rear end of the cylinder block;   a rotary shaft supported by the housing;   a swash plate that is accommodated in the swash plate chamber and configured to rotate with the rotary shaft;   a double-headed piston engaged with the swash plate;   a cylinder bore that is formed in the cylinder block and accommodates the double-headed piston;   a first compression chamber defined in the front end of the cylinder bore by the double-headed piston;   a second compression chamber defined in the rear end of the cylinder bore by the double-headed piston;   a suction chamber formed in the rear housing member;   an axial passage that is formed in the rotary shaft to be connected to the suction chamber and includes an opening that opens to the suction chamber;   a first rotary valve that selectively connects and disconnects the axial passage to and from the first compression chamber in accordance with rotation of the rotary shaft;   a second rotary valve that selectively connects and disconnects the axial passage to and from the second compression chamber in accordance with rotation of the rotary shaft; and   a protrusion provided in the suction chamber and protruding toward the opening of the axial passage, wherein   a restrictor through which refrigerant passes when flowing from the suction chamber to the axial passage is formed between the protrusion and the rear end of the rotary shaft, and   the protrusion has a distal end sized such that the distal end is insertable in the opening of the axial passage.   
     
     
         2 . The compressor according to  claim 1 , wherein the distal end of the protrusion is inserted in the axial passage. 
     
     
         3 . The compressor according to  claim 1 , wherein the protrusion is tapered. 
     
     
         4 . The compressor according to  claim 1 , wherein the protrusion extends in the axial direction of the rotary shaft and has a constant cross-sectional shape and cross-sectional area in the axial direction of the rotary shaft. 
     
     
         5 . The compressor according to  claim 1 , wherein the distal end of the protrusion is semi-spherical. 
     
     
         6 . The compressor according to  claim 1 , wherein the protrusion is formed integrally with the rear housing member. 
     
     
         7 . The compressor according to  claim 1 , wherein
 the rear housing member includes an introduction port for introducing refrigerant into the suction chamber, and   the introduction port extends in a direction intersecting the axial direction of the rotary shaft.