Bevel gears are of help when the path of a shaft’s rotation must be changed. They are usually mounted on shafts that are 90 degrees apart, but can be designed to work at other gear motor for greenhouse angles as well.
The teeth on bevel gears can be right, spiral or hypoid. Straight bevel gear teeth actually have the same problem as straight spur gear teeth — as each tooth engages, it impacts the corresponding tooth all at once.
Exactly like with spur gears, the solution to the problem is to curve the apparatus teeth. These spiral teeth engage just like helical tooth: the contact starts at one end of the gear and progressively spreads across the whole tooth.
On right and spiral bevel gears, the shafts must be perpendicular to each other, but they must also be in the same plane. If you were to prolong the two shafts at night gears, they might intersect. The hypoid equipment, however, can build relationships the axes in different planes.
Hypoid bevel gears in an automobile differential
This feature is used in many car differentials. 
The ring equipment of the differential and the input pinion equipment are both hypoid. This enables the insight pinion to be installed less than the axis of the ring gear. Figure 7 shows the input pinion engaging the band equipment of the differential. Since the driveshaft of the car 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 more room for people and cargo.