Tandem Roller. Monday , June 04th , 2018 - 14:56:52 PM
The third gear in the picture has 42 teeth. The gear ratio between the idler and third gear is thus 42/21 or 2:1 and hence the final gear ratio is 1.62x2≈3.23. For every 3.23 revolutions of the smallest gear the largest gear turns one revolution or for every one revolution of the smallest gear the largest gear turns 0.31 (1/3.23) revolution a total reduction of about 1:3.23 (Gear Reduction Ratio (GRR) = 1/Gear Ratio (GR)).
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.
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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