Friction-Connector drive; Pulley and Belt:
When two Pulleys are connected by a belt, the type of connection is known as 'Flexible Connection', as mentioned is an earlier post. In the Fig., posted below,the pulley marked 2 is the driver and pulley 4 is the driven and the two are connected using a flexible belt which is tightly (a slack belt would slip) mounted on both.
When the pulley-2 is rotates it will pull the belt along with is due to friction. That means the belt at the top of the pulley will be under a tension along the line of transmission. If the thickness of the belt is neglected the angular velocity ratio between the two pulleys will be:
When two Pulleys are connected by a belt, the type of connection is known as 'Flexible Connection', as mentioned is an earlier post. In the Fig., posted below,the pulley marked 2 is the driver and pulley 4 is the driven and the two are connected using a flexible belt which is tightly (a slack belt would slip) mounted on both.
When the pulley-2 is rotates it will pull the belt along with is due to friction. That means the belt at the top of the pulley will be under a tension along the line of transmission. If the thickness of the belt is neglected the angular velocity ratio between the two pulleys will be:
Angular velocity ratio: ω2/ω4 = R4/R2
the linear velocity of the belt remains constant and the equation is:
ω2R2 = ω4R4
It must be noted the belt drive works on tension, i.e. the belt can only pull a load, it can't push the load.
Pure Rolling contact:
By saying that the transmission is taking place due to pure rolling it is meant that there is no sliding between the mating components. It implies that in direct-contact mechanism the absolute velocities of the driver and the driven is same at the point of contact.
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