The gears that have intersecting shaft are bevel gears, straight bevel
gears, zerol bevel gears and spiral gears. These gears are designed for
the efficient transmission of power and motion between intersecting
shafts at an angle. These are ideal for applications requiring high load
capacity and are cheaper than the parallel shaft gears. They are used
where speed and strength are desirable along with the change in angle of
power flow. These gears are widely used in hand drill, locomotives,
automobiles, marine applications and all rotorcraft drive system.