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Basically, gear is a toothed wheel
designed to transmit motion or to change speed or direction to another
toothed components or gear. Gear and its teeth are designed in a manner
to minimize wear, vibration and noise, and to maximize the efficiency of
transmission.
Due to difficulty in designing high power machineries mechanical
engineers sometimes rely on electronic control and toothed belts.
Whatever may be the case, gears are the optimal medium for high accuracy
and low energy loss, even for high power machinery.
According to the meshing of toothed components gears are categorized
into several types like, circular spur gears, rack and pinion spur
gears, and worm gears. Helical and herringbone gears utilize curved
teeth for efficient, high-capacity power transmission. Worm gears,
driven by worms transmit motion between non-intersecting right-angle
axes.
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