The HST-III harmonic gearbox manufacturer tells you that gears are used to transfer power from one part of the machine to another. In bicycles, for example, it's the gear that powers the rear wheel from the pedals. Similarly, in a car, gears transfer power from the crankshaft (the rotating shaft of power from the engine) to a driveshaft running under the car, which powers the wheels. We can connect any number of gears together, and they can be of different shapes and sizes.
HST-III harmonic gearbox manufacturer tells you that whenever we transfer electricity from one gear to another, we can do one of two things: the gearbox bike gears increase speed: if you connect two gears together, a gear ratio The second gear is more, and the second gear has to turn faster to keep up. So this arrangement means that the second wheel turns faster than the one, but with less force.
Changing direction: The HST-III harmonic gearbox manufacturer tells you that when two gears mesh together, the second always turns in the opposite direction. So if one rotates clockwise, the second must rotate counterclockwise. We can also use specially shaped gears to turn the power of the machine through an angle. In a car, for example, the differential (the gearbox in the middle of the rear axle of a rear-wheel-drive vehicle) uses a bevel gear to turn the power from the drive shaft 90 degrees and turn the rear wheels.
The above information is the HST-III harmonic gearbox manufacturer's introduction and analysis of What is a gearbox and its role, hope it helps you.