A gearbox, in essence, acts because the intermediary, catching the baton in the key mover (could or not it's An electrical motor or an inner combustion motor) and passing it on on the pushed shaft – a propeller shaft of a car or truck or an industrial equipment’s spindle. https://gearbox09753.mdkblog.com/39624367/the-smart-trick-of-gearbox-that-nobody-is-discussing