We offer external gears which are considered to be the simplest gear system having cylindrical gears with straight teeth parallel to the axis. External gears consist of a wheel with exterior teeth. Such gears are used for transmitting rotary motion between parallel shafts. The smaller gear, that is the pinion, drives the wheel, which is the larger gear also having external teeth, the corresponding driving and driven shafts rotate in opposite direction. The surfaces of the two gears come into contact once. That is the reason the external gears are noisy at high speed. They are more frictionless than internal gears which give a smoother ride.
