Hypoid_gearboxes
Hypoid gearboxes are gearboxes having axes that are non-intersecting and not parallel.[1][2] The hypoid gearboxes are a subcategory of spiral bevel gearbox[3] with the axes of gears at an offset from one another. In comparison to the conical geometry of a spiral bevel gear, the basic geometry of hypoid gear is hyperbolic. The spiral angle of the pinion is larger than the spiral angle of the gear in a hypoid gearbox, so the pinion diameter can be larger than that of a bevel gear pinion. This helps in attaining an enhanced contact surface and a better tooth strength which allows for higher gear ratios and scope of higher torque transmission.[4] Bearings can also be used on both sides of gears for extra rigidity as the offset between the axes allows the scope for extra support.