Double helical gears have a groove in the middle, between the teeth, whereas herringbone gears do not. This arrangement cancels out the axial forces on each set of teeth, so larger helix angles can be used. It also eliminates the need for thrust bearings.

Double helical gears are widely used for power transmission in gas turbines, generators, cranes, fluid pumps and power transmission to the propulsion screws in military ships to achieve a quieter operation with less vibration. The large-sized double helical gears are usually generated using a special generator.

Shrewsbury Machine & Gear Inc. manufacturers Double Helical Gears from ¼” to 72”

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