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Dual clutch transmission having area controlled clutch cooling circuit

  • US 8,443,956 B2
  • Filed: 02/24/2009
  • Issued: 05/21/2013
  • Est. Priority Date: 03/04/2008
  • Status: Active Grant
First Claim
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1. 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).

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