Swash plate compressor

Abstract

The invention has its object to provide a swash plate compressor capable of realizing demonstration of an excellent sliding characteristic when a drive shaft is rotated at high speed, and of a high refrigerating capacity when the drive shaft is rotated at low speed. With the swash plate compressor of the invention, an oil guide groove, an oil guide hole, a first hole, an outflow hole, a valve hole, a communication port, a receiving chamber, a throttle hole, and a second hole constitute a release passage. The oil guide groove, the oil guide hole, the first hole, the outflow hole, the valve hole, the communication port, the receiving chamber, and the throttle hole constitute a first passage. Also, the second hole constitute a second passage. A valve mechanism increases a ratio, at which the first passage occupies the release passage, as a drive shaft is increased in rotating speed.

1 . A swash plate compressor comprising:
 a housing including a cylinder bore, a suction chamber, a discharge chamber and a crank chamber,   a drive shaft rotatably supported by the housing,   a swash plate supported on the drive shaft in the crank chamber,   a piston reciprocatingly accommodated in the cylinder bore,   a motion conversion mechanism provided between the swash plate and the piston to convert wobbling motion of the swash plate into reciprocation of the piston, and   a release passage for communication of the crank chamber to the suction chamber,   the compressor being characterized in that the release passage includes a first passage communicated to an oil rich region, in which lubricating oil is large in quantity in the crank chamber,   a valve mechanism is provided to increase opening degree of the first passage as the drive shaft is increased in rotating speed, and   the valve mechanism is provided on the first passage to be displaced by centrifugal force.   
   
   
       2 . The swash plate compressor according to  claim 1 , wherein the release passage includes a second passage communicated to an oil poor region, in which the lubricating oil is small in quantity in the crank chamber, and
 the valve mechanism increases a ratio, at which the first passage occupies the release passage, as the drive shaft is increased in rotating speed, and decreases a ratio, at which the second passage occupies the release passage, as the drive shaft is decreased in rotating speed.   
   
   
       3 . The swash plate compressor according to  claim 2 , wherein the second passage is formed with a throttle. 
   
   
       4 . The swash plate compressor according to  claim 2 , wherein the swash plate is supported to be variable in inclination angle,
 a lug plate receiving compressive reaction force is fixed to the drive shaft and rotates integrally with the drive shaft,   an oil guide path is formed on the housing to extend between the housing and the lug plate from an outer peripheral region of the crank chamber, and   the first passage is communicated to the oil guide path.   
   
   
       5 . The swash plate compressor according to  claim 4 , wherein a shaft seal device is provided to seal between the housing and the drive shaft, and
 the first passage is communicated to the oil guide path at a position close to the shaft seal device.   
   
   
       6 . The swash plate compressor according to  claim 2 , wherein the swash plate is supported to be variable in inclination angle,
 a lug plate receiving compressive reaction force is fixed to the drive shaft and rotates integrally with the drive shaft, and   the first passage includes a guide hole formed on the lug plate and opened to an outer peripheral region of the crank chamber.   
   
   
       7 . The swash plate compressor according to  claim 6 , wherein a shaft seal device is provided to seal between the housing and the drive shaft, and
 the second passage is opened to the crank chamber in the vicinity of the shaft seal device.