The transmission torque converter serves several essential functions within an automatic transmission system. Its primary purpose is to transmit power from the engine to the transmission input shaft while allowing for smooth engagement and torque multiplication. When the engine is running, the torque converter uses fluid coupling to transfer rotational energy from the engine’s crankshaft to the transmission input shaft, allowing the vehicle to move. Additionally, the torque converter provides a degree of torque multiplication, amplifying engine torque output during initial acceleration for improved low-speed performance. Furthermore, the torque converter acts as a fluid coupling that allows the engine to continue running at idle without stalling when the vehicle is stopped, enhancing drivability. Overall, the torque converter plays a critical role in transmitting power, facilitating smooth operation, and enhancing the performance of automatic transmission systems.