Patent ID: 7100743

Claim:
A crankshaft in a dual capacity compressor comprising: a driving shaft inserted in a reversible motor for rotation in a direction the same with the motor together with the motor; a balance weight on a top end of the driving shaft for prevention of vibration during rotation; a crank pin on a top surface of the balance weight eccentric from a center of the driving shaft connected to a connecting rod on a piston through an eccentricity adjusting member; and, a regular rotation and reverse rotation oil passage formed along the driving shaft, the balance weight, and the crank pin for individual oil flow both for regular direction rotation and reverse direction rotation of the motor, thereby transmitting a regular direction rotation force or a reverse direction rotation force of the motor to a coupled driving members for compressing refrigerant according to a compression capacity varied with rotation direction, and making a stable oil supply to required driving parts through the regular rotation and reverse rotation oil passage regardless of a motor rotation direction.