Patent ID: 8443956

Claim:
A dual clutch transmission ( 10 ) having a hydraulic circuit ( 110 ) for controlling and cooling the clutches ( 32 , 34 ) of the dual clutch transmission, said dual clutch transmission ( 10 ) comprising: said hydraulic circuit ( 110 ) having a source o pressurized cooling fluid ( 112 ); first and second lube valves ( 116 , 118 ) in fluid communication with said source of pressurized fluid ( 112 ), each of said first and second lube valves including a lube valve body ( 218 ) and a lube valve member ( 220 ) movably supported in said lube valve body to selectively and independently provide a flow of cooling fluid to each of the clutches ( 32 , 34 ) of the dual clutch transmission with each of said lube valves ( 116 , 118 ) including a biasing member ( 225 ) that acts on said lube valve member ( 220 ) to bias it to a normally closed position; and first and second control actuators ( 120 , 122 ) at fluid communication with a corresponding one of said first and second lube valves ( 116 , 118 ) and adapted to selectively control said first and second lube valves, each of said first and second control actuators in fluid communication with said source of pressurized cooling fluid ( 112 ) and including an actuator valve body ( 226 ), an actuator valve member ( 228 ) movably supported by said actuator valve body and a solenoid ( 230 ), said solenoid adapted to move said actuator valve member ( 228 ) of said control actuator to produce a signal pressure that is an inverse function of the current delivered to said solenoid ( 230 ) and to deliver a predetermined control signal pressure to each of said lube valve members ( 220 ) of said first and second lube valves ( 116 , 118 ) to move said lube valve members against the bias of said biasing member ( 225 ) to selectively open said first and second lube valves thereby delivering a controlled, predetermined amoral, of cooling fluid to the clutches ( 32 , 34 ) of the dual clutch transmission ( 10 ).