It was initially introduced in 1939 for vehicles. It contains the fluid coupling and 3 planetary gears. They collectively make a few ahead and just one reverse velocity. There is no clutch for engagement and disengagement from your motor. Bevel gearboxes have spiral and straight tooth designs. These gearboxes https://gearbox86418.is-blog.com/40297438/indicators-on-gearbox-you-should-know