thomas. Tandem Roller. June 04th , 2018.
In a sequence of gears chained together the ratio depends only on the number of teeth on the first and last gear. The intermediate gears regardless of their size do not alter the overall gear ratio of the chain. However the addition of each intermediate gear reverses the direction of rotation of the final gear.
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.
A double reduction gear comprises two pairs of gears as single reductions in series. 3 In the diagram the red and blue gears give the first stage of reduction and the orange and green gears give the second stage of reduction. The total reduction is the product of the first stage of reduction and the second stage of reduction.
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