We first need to understand that there is no direct link between the crankshaft and the transmission input shaft (except in the case of a lock up style converter, but we'll talk about that later). This means that the first function of the converter is to connect the crankshaft and the input shaft so the engine can move the vehicle; this is accomplished through the utilization of a fluidic coupling effect.
The torque converter also replaces the clutch that is required in a manual transmission; this is how an automatic transmission vehicle can come to a stop while still being in gear without stalling the engine. - read the continuation at
http://www.writeups.pictyors.com/Article/Torque-Converter-Operation-Explained/6823Linkback:
https://tubagbohol.mikeligalig.com/index.php?topic=41099.0
