Tandem Roller. Monday , June 04th , 2018 - 15:13:37 PM
Idler gears can also transmit rotation among distant shafts in situations where it would be impractical to simply make the distant gears larger to bring them together. Not only do larger gears occupy more space the mass and rotational inertia (moment of inertia) of a gear is proportional to the square of its radius. Instead of idler gears a toothed belt or chain can be used to transmit torque over distance.
Since the effectiveness of a roller depends to a large extent on its weight self-powered vehicles replaced horse-drawn rollers from the mid-19th century. The first such vehicles were steam rollers. Single-cylinder steam rollers were generally used for base compaction and run with high engine revs in a low gear to promote bounce and vibration from the crankshaft through to the rolls in much the same way as a vibrating roller. The double cylinder or compound steam rollers became popular from around 1910 onwards and were used mainly for the rolling of hot-laid surfaces due to their smoother running engines but both cylinder types are capable of rolling the finished 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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