Gears

Gears are mechanical devices that transmit power and motion between axes. There are a number of different gear types. Examples include spur gears, change gears, cluster gears, and helical gears. Spur gears are straight-toothed and transmit power and motion between parallel axes. Change gears resemble spur gears and are hubless with a keyway that mates with a hub for rapid changing. Cluster gears are spur gears with an integral hub whose end can accept a second, hubless gear. Helical gears a helical-toothed and transmit power and motion between parallel axes (opposite hand) or right-angle axes (same-hand). In herringbone gears, each tooth comprises two opposing helices. They transmit power and motion between parallel axes and may or may not have center groove.

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