Patent ID: 6511296
Filing Date: 2003-01-28
Classification: F04B

Abstract:
A compressor in which a drive shaft is rotatably supported in a housing which defines therein a crank chamber; a cylinder block which forms a part of the housing is provided with a cylinder bore; a piston is accommodated in the cylinder bore so as to reciprocally move; a rotary support is secured to the drive shaft so as to rotate together therewith; a cam plate is connected to the rotary support through a hinge mechanism so as to rotate together therewith and to vary an angle with respect to the drive shaft; said piston is connected to the cam plate so that the rotation of the drive shaft causes the piston to reciprocally move to thereby suck and discharge a refrigerant and that the stroke of the piston can be varied by varying the angle of the cam plate with respect to the drive shaft, whereina radial bearing is provided between the outer peripheral surface of a boss portion formed on the rotary support and the housing to support the drive shaft, a coil spring is wound around the drive shaft between the cam plate and the rotary support to bias the cam plate in a direction to reduce the stroke of the piston, said coil spring being inserted in a spring receiving portion formed in the rotary support on the side thereof opposite the boss portion, the diameter of the outer periphery of the boss portion is greater than the diameter of the spring receiving portion.