| 摘要 |
A clutch piston slidably mounted for motion in the axial direction on the turbine shaft or the turbine runner of a torque converter comprising a pump, an impeller, a turbine runner and a stator. A direct coupling clutch is positioned between the clutch piston and the housing of a torque converter. Pressurized oil is supplied for releasing the clutch within an oil chamber between one side of the clutch piston and the housing. A converter pressure is continuously applied to the oil chamber and to the other side of the clutch piston, which is the operating chamber of the torque converter. Thereby, the direct coupling clutch is continuously released. When the automatic transmission is in a selected high speed position, a line pressure higher than the converter pressure, is applied to the operating chamber causing the direct coupling clutch to engage. Converter pressure is applied continuously to the operating chamber of the torque converter through one port of a check valve. The other check valve port is connected to the line pressure only when the automatic transmission is shifted to said high speed position, causing the direct coupling clutch to automatically engage.
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