Compressor

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, wherein
• a 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.