Tandem Roller. Monday , June 04th , 2018 - 15:04:44 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.
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.
As internal combustion engine technology improved during the 20th century kerosene- gasoline- (petrol) and diesel-powered rollers gradually replaced their steam-powered counterparts. The first internal-combustion powered road rollers were very similar to the steam rollers they replaced. They used similar mechanisms to transmit power from the engine to the wheels typically large exposed spur gears. Some users did not like them in their infancy as the engines of the era were typically difficult to start particularly the kerosene-powered ones.
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