Automatic transmission vehicles have a torque converter which is a kind of final drive mechanism with fluid coupling, which permits the engine to turn to some degree independent of the vehicle’s transmission. Presuming a very slow engine rotation, such as when the car is lazing at a traffic light, the aggregate torque delivered through the automotive torque converter is very negligible, so that keeps the car still just by applying a light pressure on the brake pedal. In a torque converter, the pump is typically connected with the engine flywheel. The input shaft of the transmission is connected with the turbine. While the vehicle is in gear, as the engine’s rotation increases, the torque is transmitted from the engine to the propeller shaft or input shaft by the movement of the fluid, thus driving the vehicle. So, the mechanism of the fluid coupling strongly resembles that of a mechanical clutch of a manual transmission vehicle.
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An automotive torque converter is a kind of hydraulic transmission which upsurges the torque of the vehicle by reducing its speed. It delivers a continuous deviation of ratio from high to low. The basic ability of a torque converter is to increase torque when there is a significant difference between output and input engine rotational speed; thus, it provides the same functionality of a lessening gear. An automotive transmission vehicle has no clutch that disconnects the transmission from the engine.
There is no physical interconnection between the rotor and the impeller and the torque is transferred by quality of the fluid inside the coupling. When the engine rotates the impeller, it transfers energy and velocity to the liquid, which is transformed into powered energy in the rotor which rotates it. The fluid trails in a locked circuit of movement from impeller to the rotor through an air gap which is at the outside periphery and again from rotor toward the impeller through the air gap which is at the internal periphery.