Importance

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Abstract

A friction clutch which transmits motive power of a main drive shaft to an auxiliary drive shaft, a piston which generates pressing force against the friction clutch, a cylinder chamber which houses the piston movably in the axial direction, a pressure sensor which detects the oil pressure of the cylinder chamber, an hydraulic pump which feeds pressurized oil to the cylinder chamber, a motor which drive the hydraulic pump forward/reversely, and a controller which compares a command from a vehicle with a signal from the pressure sensor and controls the forward/reverse drive of the motor are provided. An hydraulic control valve unit feeds the pressurized oil to the cylinder chamber when the hydraulic pump is rotated forward, prevents outflow of the pressurized oil from the cylinder chamber when forward rotation of the hydraulic pump is stopped, and forcibly discharges the pressurized oil from the cylinder chamber when the hydraulic pump is reversely rotated.

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First Claim