Velocity Ratio of Belt Drive

Velocity Ratio of Belt Drive

It is the ratio between the velocities of the driver and the follower or driven. It may be expressed, mathematically, as discussed below:

Let d1 = Diameter of the driver, d2 = Diameter of the follower,

N1 = Speed of the driver in r.p.m., and N2 = Speed of the follower in r.p.m.

Length of the belt that passes over the driver, in one minute = π d1N1

Similarly, length of the belt that passes over the follower, in one minute = π dN2

Since the length of belt that passes over the driver in one minute is equal to the length of belt that passes over the follower in one minute, therefore

π dN1 = π dN2

When the thickness of the belt (t) is considered, then velocity ratio,

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