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Belt tension for V-belt:
What is V-belt. Drive expression of Ratio in belt tension for V-belt
Sol: The power from one shaft to the other shaft can be transmitted with the help of V-belt drive and rope drive. Figure given below shows a V-belt with a grooved pulley.
Sol: Let RN = Normal reaction between the belt and sides with grooved pulley.
2a = Angle of groove
µ = Co-efficient of friction in between belt and pulley. R = Total reaction in plane of groove.
Resolving forces vertically, we get
R = RN sin a + RN sin a
= 2RN sin a
RN = (R/2) cosec a ...(i)
Frictional resistance = µRN + µRN = 2µRN = 2µ(R/2)cosec a
= µR cosec a = R × mcosec a
As in flat belt frictional resistance is equal to µR, and in case of V-belt µcoseca X R
As a result,
Ratio of Tension in V-Belt:: T1/T2 = eµ.θ.cosec a
Evaluate power transmitted by belt. Sol: Let T 1 = Tension in tight side of the belt T 2 = Tension in slack side of the belt V = Velocity of belt in m/sec. = Π
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