Tandem Roller. Monday , June 04th , 2018 - 15:04:38 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)).
The next machine is usually a single smooth drum compactor that compacts the high spots down until the soil is smooth and this is usually done in combination with a motor grader to get a level surface. Sometimes at this stage a pneumatic tyre roller would be used. These rollers feature two rows (front and back) of pneumatic tyres that overlap and the flexibility of the tyres provides a kneading action that seals the surface and with some vertical movement of the wheels enables the roller to operate effectively on uneven ground. Once the soil base is flat the pad drum compactor is no longer used on the road surface.
In some parts of the world road rollers are still known colloquially as steam rollers regardless of their method of propulsion. This typically only applies to the largest examples
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