Q. Write different relations used in belt drive.
Sol: Let:
D_{1} = Diameter of driver
N_{1} = Speed of the driver in Rotation per minute
D_{2} = Diameter of the driven or Follower
N_{2} = Speed of the driven or follower in Rotation per minute
R_{1} = Radius of the driver
R_{2} = Radius of the driven or Follower
t = Belt thickness
X = Distance between the centers of two pulleys
α = Angle of lap (less than 10º)
θ = Angle of contact (greater than 150º) (express in radian.)
μ = Coefficient of friction
s = Total slip in percentage
L = Total length of belt
Formula For Open Belt Drive
V.R. V.R = N2/N1
The thickness is V.R = N2/N1 =
The slip is V.R = N /N = (D1/D2) [1-s/100]
Slip and thickness both are considered V.R = N2/N1 = [1-s/100]
Angle of contact θ = ∏ - 2α
Angle of lap Sinα = (r1-r2)/X
Length of belt L = ∏ (r1 + r2)^{2}/x + 2X