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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.
In helical gears, teeth are cut in the form of the helix around the gear. Their teeth are not parallel to the shaft axis. The helical gears run smoothly and more quietly at high speeds and curvilinear contact of gear teeth giving gradual engagement.