Driving part for variable-capacity compressor

Abstract

The drive unit has an effect of maintaining controllability and preventing a hunting problem caused under low flow conditions since it includes a friction ring module.

1 .- 14 . (canceled) 
     
     
         15 . A drive unit for a variable capacity compressor, comprising:
 a drive shaft, one end of which is connected to a pulley of an engine, so that a driving force is transmitted from the engine to the drive shaft;   a support balance coupled to a pulley-side end of the drive shaft to support a thrust bearing;   a swash plate spaced apart from the support balance and allowing a discharge rate and a pressure of refrigerant to be regulated according to an angle of inclination of the swash plate;   a hinge part configured to connect the support balance to the swash plate and transmit a rotational force of the drive shaft to the swash plate; and   a friction ring module configured to control the angle of inclination of the swash plate under low flow conditions by a frictional force generated between the drive shaft and the friction ring module.   
     
     
         16 . The drive unit according to  claim 15 , wherein the friction ring module comprises a ring body fitted to the drive shaft in its longitudinal direction, and a support spring fitted onto the ring body. 
     
     
         17 . The drive unit according to  claim 16 , wherein the ring body is polygonal pipe shape or cylindrical shape. 
     
     
         18 . The drive unit according to  claim 16 , wherein the ring body has an inner diameter smaller than an outer diameter of the drive shaft. 
     
     
         19 . The drive unit according to  claim 16 , wherein the ring body has an opening formed in its longitudinal direction. 
     
     
         20 . The drive unit according to  claim 16 , further comprising a circular or semicircular retainer disposed at one side of the drive shaft facing the connected pulley to restrict movement of the friction ring module. 
     
     
         21 . The drive unit according to  claim 20 , wherein the ring body comprises a plurality of hooks extending outward from one end thereof facing the swash plate and bent toward the retainer. 
     
     
         22 . The drive unit according to  claim 21 , wherein the support spring is inserted between the hooks and the ring body. 
     
     
         23 . The drive unit according to  claim 22 , wherein a distance between the ring body and each of the hooks is larger than a thickness of the support spring 
     
     
         24 . The drive unit according to  claim 16 , wherein the support spring has an inner diameter greater than an outer diameter of the ring body. 
     
     
         25 . The drive unit according to  claim 20 , wherein the ring body moves along the drive shaft when the angle of inclination of the swash plate is changed, and is stopped by coming into contact with the retainer when the swash plate is inclined at a minimum angle. 
     
     
         26 . The drive unit according to  claim 16 , wherein the ring body has a plurality of friction protrusions protruding from its inner peripheral surface to the drive shaft. 
     
     
         27 . A variable capacity compressor, which comprises a drive shaft rotatably supported in a housing and a swash plate allowing a discharge rate of refrigerant to be variably controlled according to an angle of inclination of the swash plate while a driving force transmitted to the drive shaft is transmitted to the swash plate, the variable capacity compressor comprising:
 a friction member coupled to the drive shaft to be axially movable, positioned between the swash plate and a support spring for applying a force in a direction of increasing the angle of inclination of the swash plate in an initial stage of operation, and configured to have a centrifugal force,   wherein the friction member restricts a rapid change in the angle of inclination of the swash plate under low flow conditions by a frictional force generated between the friction member and the drive shaft   
     
     
         28 . The variable capacity compressor according to  claim 27 , wherein the friction member is modularized with the support spring to be axially coupled to the drive shaft.