Swash-plate-type variable displacement compressor

Abstract

A swash-plate-type variable displacement compressor is provided with a rotationally-driven drive shaft, a lug plate integrally fixed to the drive shaft, a swash plate fixed in a manner capable of being variably inclined to the drive shaft, a link mechanism for coupling the lug plate and the swash plate while permitting the variable inclination; and an actuator which is arranged between the lug plate and the swash plate and which uses pressure to change an inclination angle of the swash plate. The actuator has a cylindrical member which extends from a surface of the lug plate toward the swash plate, a bottomed cylindrical member fitted capable of being relatively displaceable to an outer peripheral surface of the cylindrical member, and a coil spring which is arranged in an inner space of the actuator, and which biases the bottomed cylindrical member in a direction which is away from the lug plate.

1 . A swash-plate-type variable displacement compressor comprising:
 a rotationally-driven drive shaft;   a lug plate integrally fixed to the drive shaft;   a swash plate fixed in a manner capable of being variably inclined to the drive shaft;   a coupling mechanism for coupling the lug plate and the swash plate while permitting variable inclination of the swash plate, and   an actuator which is arranged between the lug plate and the swash plate and which uses pressure to change an inclination angle of the swash plate,   wherein the actuator comprises:   a cylindrical member which extends from a surface of the lug plate toward the swash plate,   a bottomed cylindrical member fitted capable of being relatively displaceable to an outer peripheral surface of the cylindrical member, and   a biasing member which is arranged in an inner space defined by the lug plate, the cylindrical member and the bottomed cylindrical member, and which biases the bottomed cylindrical member in a direction which is away from the lug plate.   
     
     
         2 . The swash-plate-type variable displacement compressor according to  claim 1 , wherein the bottomed cylindrical member has a smaller diameter portion fitted capable of being relatively displaceable with respect to an outer peripheral surface of the drive shaft. 
     
     
         3 . The swash-plate-type variable displacement compressor according  claim 1 , wherein the cylindrical member is separate from the lug plate. 
     
     
         4 . The swash-plate-type variable displacement compressor according to  claim 1 , wherein a seal member for securing air-tightness with the drive shaft is attached to the bottomed cylindrical member. 
     
     
         5 . The swash-plate-type variable displacement compressor according to  claim 1 , wherein the cylindrical member and the bottomed cylindrical member are arranged concentrically with the drive shaft. 
     
     
         6 . The swash-plate-type variable displacement compressor according to  claim 1 , wherein the biasing member is a coil spring. 
     
     
         7 . The swash-plate-type variable displacement compressor according  claim 2 , wherein the cylindrical member is separate from the lug plate. 
     
     
         8 . The swash-plate-type variable displacement compressor according to  claim 2 , wherein a seal member for securing air-tightness with the drive shaft is attached to the bottomed cylindrical member. 
     
     
         9 . The swash-plate-type variable displacement compressor according to  claim 3 , wherein a seal member for securing air-tightness with the drive shaft is attached to the bottomed cylindrical member. 
     
     
         10 . The swash-plate-type variable displacement compressor according to  claim 2 , wherein the cylindrical member and the bottomed cylindrical member are arranged concentrically with the drive shaft. 
     
     
         11 . The swash-plate-type variable displacement compressor according to  claim 3 , wherein the cylindrical member and the bottomed cylindrical member are arranged concentrically with the drive shaft. 
     
     
         12 . The swash-plate-type variable displacement compressor according to  claim 4 , wherein the cylindrical member and the bottomed cylindrical member are arranged concentrically with the drive shaft. 
     
     
         13 . The swash-plate-type variable displacement compressor according to  claim 2 , wherein the biasing member is a coil spring. 
     
     
         14 . The swash-plate-type variable displacement compressor according to  claim 3 , wherein the biasing member is a coil spring. 
     
     
         15 . The swash-plate-type variable displacement compressor according to  claim 4 , wherein the biasing member is a coil spring. 
     
     
         16 . The swash-plate-type variable displacement compressor according to  claim 5 , wherein the biasing member is a coil spring.