Gears in gearboxes may be among many forms, from bevel and helical gears to worm gears and planetary gears. The equipment is mounted on the shaft supported by roller bearings and rotates all over it. That has a handbook gearbox, the driver manually chooses all ratios using a moveable equipment https://gearbox19630.slypage.com/34222536/considerations-to-know-about-gearbox