Double Helical Gear
The double helical gear gives a much smoother still operation than the spur or helical gear and reduces the noise levels further. However, it is more difficult to manufacture than the helical. The advantage over the helical is that it does not result in a force along the axis of the gears.
A double helical gear set with a very large ratio.
See also: Gears, Helical Gear.
Subjects: Mechanical Engineering