Tandem Roller. Monday , June 04th , 2018 - 15:13:09 PM
It is essential to have two coupled gears of different sizes on the intermediate layshaft. If three gears were used the overall ratio would be simply that between the first and final gears the intermediate gear would only act as an idler gear: it would reverse the direction of rotation but not change the ratio.
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.
Rollers are also used in landfill compaction. Such compactors typically have padfoot or "sheep s-foot" drums and do not achieve a smooth surface. The pads aid in compression due to the smaller area contacting the ground.
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