A v-belt drive is used to transmit 38 kW power at 1440 r.p.m. from a three phase induction motor to a centrifugal pump, required to be operated at 360 r.p.m. The motor pulley pitch diameter is 225 mm and the groove angle is $38^0$. The central distance between the pulleys is 1 m. The coefficient of friction for the belt pulley combination is 0.2 and the density of the belt material is 0.97 gm/cc. If the allowable tension in the belt is 800 N, determine:

i) the number of belts required; and ii) the pitch length of the belt.

Assume suitable cross-section for the belt based on the power to be transmitted.

Mumbai University > Mechanical Engineering > Sem 7 > Machine Design 2

Marks: 10M

Year: Dec 2016

$$P = 38 kW$$

$d = 225 mm\\ N_1 = 1440\\ N_2 = 360\\ i = 4\\ c = 1m$

For P = 38 and d = 225 mm

Select cross section (PSG 7.58)

For c - 8

Top width W = 22 mm

Nominal thickness T = 14 mm …