Gears in gearboxes is usually one among several varieties, from bevel and helical gears to worm gears and planetary gears. The gear is mounted on a shaft supported by roller bearings and rotates around it. The skew bevel helical gearbox mirrors the bevel helical product but differs in shaft orientation. https://johnnynqomk.izrablog.com/34164567/a-review-of-gearbox