Patent attributes
A replacement torque converter clutch (TCC) apply valve for regulating the application of the torque converter clutch within an automatic transmission. The present TCC apply valve includes a valve piston having an expandable seal located at the primary wear location within the valve body to reduce hydraulic leakage. The valve piston also includes an internal fluid gallery formed therein in fluid communication with an annular groove wherein the expandable seal resides. Whenever the present TCC apply valve is actuated, TCC signal pressure enters the fluid gallery in the valve piston under pressure and urges the expandable seal in a radially outward direction into contact with the mating bore to minimize hydraulic fluid leakage during the apply cycle of the torque converter clutch. The valve piston also includes a control land having a substantially increased axial length with annular lubrication grooves, which improves stability and accuracy in operation.
