It had been first introduced in 1939 for vehicles. It is made up of the fluid coupling and 3 planetary gears. They collectively make 3 forward and just one reverse velocity. There's no clutch for engagement and disengagement from your motor. They've a sizable transmission rate and large bearing https://gearbox83793.elbloglibre.com/33767660/the-definitive-guide-to-gearbox