Tandem Roller. Monday , June 04th , 2018 - 14:56:06 PM
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
Idler gears can also transmit rotation among distant shafts in situations where it would be impractical to simply make the distant gears larger to bring them together. Not only do larger gears occupy more space the mass and rotational inertia (moment of inertia) of a gear is proportional to the square of its radius. Instead of idler gears a toothed belt or chain can be used to transmit torque over distance.
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.
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