Patent ID: 6443278
Filing Date: 2002-09-03
Classification: F16D

Abstract:
A power transmission apparatus for a vehicle, comprising:a hydraulic pressure clutch capable of switching to transmit and cut power between an engine crankshaft and driving wheels of the vehicle; a hydraulic pump; a gear transmission for being provided between said clutch and the driving wheels, said gear transmission including a plurality of gear trains forming a plurality of shift stages; an actuator for shifting said gear transmission; and a control unit for controlling said actuator and said linear solenoid such that said clutch is operated to cut and connect in cooperation with shift operation of the gear transmission; and a clutch control valve for controlling hydraulic pressure provided to said clutch, said clutch control valve including: a valve housing having an input port connected to said hydraulic pump and an output port connected to said clutch; a spool capable of switching to communicate and cut between said input port and said output port, said spool being slidably fitted in said valve housing; a linear solenoid coaxially connected to said spool; and wherein output hydraulic pressure from said output port can be controlled to a value in correspondence with input current to said linear solenoid.