This is a feature past what a simple fluid coupling presents, which often can match rotational speed but does not multiply torque. Fluid-coupling–based torque converters also usually contain a lock-up function to rigidly couple input and output and stay away from the efficiency losses linked to transmitting torque by fluid https://torqueconverterclutch08632.blogdun.com/34357524/little-known-facts-about-torque-converter-clutch