Bevel gears are of help when the direction of a shaft’s rotation needs to be changed. 
They are Water-lubricated Air Compressor usually mounted on shafts that are 90 degrees aside, but could be designed to just work at various other angles as well.
One’s teeth on bevel gears can be right, spiral or hypoid. Right bevel gear teeth actually have the same issue as straight spur equipment tooth — as each tooth engages, it impacts the corresponding tooth all at one time.
Exactly like with spur gears, the answer to this problem is to curve the apparatus teeth. These spiral teeth engage just like helical tooth: 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 lengthen the two shafts at night gears, they would intersect. The hypoid gear, however, can engage with the axes in various planes.
Hypoid bevel gears in a car differential
This feature can be used in many car differentials. The band equipment of the differential and the insight pinion gear are both hypoid. This enables the input pinion to be installed lower than the axis of the ring gear. Figure 7 shows the input pinion engaging the band gear 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 into the passenger compartment of the car as much, making even more room for people and cargo.