It had been to start with introduced in 1939 for automobiles. It consists of the fluid coupling and a few planetary gears. They collectively make a few ahead and just one reverse speed. There is absolutely no clutch for engagement and disengagement from the engine. Most transmissions in present https://gearbox20741.pointblog.net/the-smart-trick-of-gearbox-that-nobody-is-discussing-77390083