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Their advantage over the helical gears is that the side-thrust of one half is balanced by that of the other half. This means that herringbone gears can be used in torque gearboxes without requiring a substantial thrust bearing.
The utilization of quill shafts and couplings in this manner effectively divides the gear elements into three component parts, each of which can be handled separately. Quill shafts are also used between the first and second reductions to obtain flexibility. The use of double helical gears as opposed to a single reduction gear, reduces shock in the gear train. Since the double helical gears have two sets of teeth at complimentary angles, end thrust is prevented.