Lockup Mechanism

TORQUE CONVERTER CLUTCH (TCC, LOCK-UP) MECHANISM








When the solenoid valve No.2 (TCC solenoid valve) is turned ON and OFF, the TCC (lock-up) ON/OFF operation is controlled automatically. When the TCC is OFF, the TCC solenoid valve is turned OFF and the line pressure from the A passage and the spring tension is stronger than the line pressure from the B passage, thereby the valve is pushed down and the TCC is turned OFF.
When the TCC solenoid valve is turned ON, the line pressure in the A passage is drained and the line pressure from the B passage becomes stronger than the spring tension so that the valve is pushed up to turn the TCC ON.