Tandem Roller. Monday , June 04th , 2018 - 15:12:16 PM
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.
The next course (road base) would be compacted using a smooth single drum smooth tandem roller or pneumatic tyre roller in combination with a grader and a water truck to achieve the desired flat surface with the right moisture content for optimum compaction. Once the road base is compacted the smooth single drum compactor is no longer used on the road surface (There is however an exception if the single drum has special flat-wide-base tyres on the machine).
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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