Gears in gearboxes could be one of several varieties, from bevel and helical gears to worm gears and planetary gears. The gear is mounted on the shaft supported by roller bearings and rotates all around it. Such a gearbox capabilities driver and driven shafts that share the middle line (coaxial) https://gearbox76318.bloggosite.com/40525908/an-unbiased-view-of-gearbox