Tandem Roller. Monday , June 04th , 2018 - 15:02:50 PM
An intermediate gear which does not drive a shaft to perform any work is called an idler gear. Sometimes a single idler gear is used to reverse the direction in which case it may be referred to as a reverse idler. For instance the typical automobile manual transmission engages reverse gear by means of inserting a reverse idler between two gears.
The transmission of rotation between contacting toothed wheels can be traced back to the Antikythera mechanism of Greece and the south-pointing chariot of China. Illustrations by the Renaissance scientist Georgius Agricola show gear trains with cylindrical teeth. The implementation of the involute tooth yielded a standard gear design that provides a constant speed ratio.
The input gear in this gear train has 13 teeth and the idler gear has 21 teeth. Considering only these gears the gear ratio between the idler and the input gear can be calculated as if the idler gear was the output gear. Therefore the gear ratio
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