Tandem Roller. Monday , June 04th , 2018 - 15:01:49 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.
At this ratio it means the drive gear must make 1.62 revolutions to turn the driven gear once. It also means that for every one revolution of the driver the driven gear has made 1/1.62 or 0.62 revolutions. Essentially the larger gear turns slower.
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)).
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