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Bevel gears are useful when the path of a shaft’s rotation needs to be changed. They are usually installed on shafts that are 90 degrees aside, but could be designed to work at other angles as well.

The teeth on bevel gears can be straight, spiral or hypoid. Right bevel gear teeth actually have the same problem as straight spur gear tooth — as each tooth engages, it impacts the corresponding tooth all at one time.

Just like with spur gears, the perfect solution is to the problem is to curve the apparatus teeth. These spiral tooth Gearbox engage exactly like helical teeth: the contact begins at one end of the gear and progressively spreads over the whole tooth.

On direct and spiral bevel gears, the shafts must be perpendicular to each other, but they must maintain the same plane. If you were to prolong the two shafts past the gears, they would intersect. The hypoid equipment, however, can build relationships the axes in various planes.

Hypoid bevel gears in an automobile differential

This feature can be used in many car differentials. The ring equipment of the differential and the input pinion gear are both hypoid. This allows the insight pinion to be installed less than the axis of the band gear. Figure 7 shows the input pinion engaging the ring equipment of the differential. Because the driveshaft of the automobile is connected to the insight pinion, this also lowers the driveshaft. This implies that the driveshaft doesn’t intrude in to the passenger compartment of the automobile as much, making even more room for individuals and cargo.