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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.
A spur gear is the simplest and most common type of gear. It is essentially a disk with a series of uniform teeth projecting along the outer edge. The spur gear is used in many everyday devices, from the tiny plastic ones in wind-up toys to the large metal versions used in industrial washing machines.