Patent ID: 7575111
Filing Date: 2009-08-18
Classification: F16H,Y10T

Abstract:
1. A hydraulic pressure control apparatus for a vehicular power transmitting device in which a direct-coupled clutch and a continuously variable transmission having a friction apply device and a shifting mechanism for continuously shifting speed ratios are provided in a power transmission path between a power source for running and a driving wheel, the hydraulic pressure control apparatus comprising: a first control valve that switches the direct-coupled clutch between an applied state and a released state; a second control valve that switches hydraulic pressure supplied to the friction apply device; a direct-coupled clutch control solenoid valve that controls operation of the first control valve; and a pair of shift control solenoid valves that control operation of the shifting mechanism, wherein the second control valve is configured to switch between a first position which supplies a first hydraulic pressure to the friction apply device and a second position which supplies a second hydraulic pressure to the friction apply device based on hydraulic pressure output from the pair of shift control solenoid valves, and when hydraulic pressure is output from both of the shift control solenoid valves, the second control valve switches from the first position to the second position and outputs at least one hydraulic pressure from among the hydraulic pressures output from the pair of shift control solenoid valves, and the first control valve is configured to switch to a position that releases the direct-coupled clutch when hydraulic pressure from at least one of the two shift control solenoid valves is output from the second control valve.