Swash plate compressor having variable capacity

Abstract

A swash plate type compressor having variable capacity includes a housing unit having a cylinder block where a plurality of bores are formed and forming a crank chamber, a suction chamber, and a discharge chamber, a drive shaft rotatably installed by the housing unit, a piston installed at each of the bores of the cylinder to be capable of sliding, a rotor disposed at the crank chamber and installed at the drive shaft, and rotating together with the drive shaft, a swash plate coupled to the rotor by a hinge unit for reciprocating the piston and having a hub coupled to the drive shaft, and a pivot unit for limiting pivot of the swash plate as a slot formed in the drive shaft in the axial direction and the hub of the swash plate are directly pin-coupled. In the compressor, first and second flat portions are formed at both sides of the drive shaft in a direction perpendicular to the slot of the drive shaft, and third and fourth flat portions are formed at an inner surface of the hub corresponding to the first and second flat portions.

What is claimed is:  
     
         1 . A swash plate type compressor having variable capacity comprising: 
 a housing unit having a cylinder block where a plurality of bores are formed and forming a crank chamber, a suction chamber, and a discharge chamber;    a drive shaft rotatably installed by the housing unit;    a piston installed at each of the bores of the cylinder to be capable of sliding;    a rotor disposed at the crank chamber and installed at the drive shaft, and rotating together with the drive shaft;    a swash plate coupled to the rotor by a hinge unit for reciprocating the piston and having a hub coupled to the drive shaft; and    a pivot unit for limiting pivot of the swash plate as a slot formed in the drive shaft in the axial direction and the hub of the swash plate are directly pin-coupled,    wherein first and second flat portions are formed at both sides of the drive shaft in a direction perpendicular to the slot of the drive shaft, and third and fourth flat portions are formed at an inner surface of the hub corresponding to the first and second flat portions.    
     
     
         2 . The compressor as claimed in  claim 1 , wherein the hinge unit comprises a first arm extending from the rotor toward the hub where a guide portion is formed, and second arm extending from the hub toward the first arm where a hinge pin guided by the guide portion of the first arm is installed.  
     
     
         3 . A swash plate type compressor having variable capacity comprising: 
 a housing unit having a cylinder block where a plurality of bores are formed and forming a crank chamber, a suction chamber, and a discharge chamber;    a drive shaft rotatably installed by the housing unit;    a piston installed at each of the bores of the cylinder to be capable of sliding;    a rotor disposed at the crank chamber and installed at the drive shaft, and rotating together with the drive shaft;    a swash plate coupled to the rotor by a hinge unit for reciprocating the piston and having a hub coupled to the drive shaft; and    a pivot unit for limiting a range of movement of the swash plate with respect to the drive shaft without change in the center of rotation of the swash plate as the center of rotation of the swash plate moves along a central axis of the drive shaft.    
     
     
         4 . The compressor as claimed in  claim 3 , wherein the hinge unit comprises a first arm extending from the rotor toward the hub where a guide portion is formed, and second arm extending from the hub toward the first arm where a hinge pin guided by the guide portion of the first arm is installed.  
     
     
         5 . The compressor as claimed in  claim 3 , wherein the pivot unit limits pivot of the swash plate as a slot formed in the drive shaft in the axial direction and the hub of the swash plate are directly pin-coupled.