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Theory of Machines


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I'm not sure that I understand our question. However, the ration is a multiple of the drive pulley diameter to the driven pulley diameter. If the smaller diameter pulley is on the drive shaft and the larger is the driven then it is a speed reduction. If the larger is on the drive and the smaller is driven then it iincreases the speed. 

While in theory there maybe no limits to the size of the pulleys, space and expense drives the practical limits. In general the greatest ratio is about 6:1. 

The smallest diameter pulley that can be used is a function of required horsepower, belt material, the area of contact with surface of the pulley that the belt makes (arc of contact). 

 All material have a critical speed that they can safely operate at. Since the diameter of pulley and the operating RPM determines the actual rim speed...this will effect what the largest diameter that the pulley can be as well. 

Hopefully thisis what you were looking for.



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