Assignment 1B - Belt Drive PDF
Assignment 1B - Belt Drive PDF
Assignment 1B - Belt Drive PDF
Assignment 1(B)
Power Transmission – Belt Drive
1. A prime pulley running at 300rpm drives a D.C generator at 500rpm by a belt drive.
Given that a diameter of the prime pulley is 60cm. Assuming slip of 3 percent,
determine the diameter of generator of pulley, if the belt thickness is 6mm.
[Answer: 0.346m]
[Answer: 0.447m]
3. The diameter of a pulley on the driving shaft rotating at 120 rpm is 60 cm. Another
shaft is to be driven at 300 rpm by an open belt drive, μ = 0.3 and the distance
between the centre line of the shaft is 2.4 m. Determine the tension on the tight and
slack side of the belt to transmit 3 kW power.
4. A driver pulley with a diameter of 200mm is connected to a power source with speed
of 1500rpm. A driven pulley with a diameter 800mm is connected to a driver pulley
using a flat belt. The distances between these two pulleys are 1m. if the tension at the
tight sight is 800N, find:
6. A belt drive consists of two V-belts in parallel, on grooved pulleys of the same size.
The angle of the groove is 30°. The cross sectional area of each belt is 750mm2 and μ
= 0.12. The density of the belt material is 1.2Mg/m3 and the maximum safe stress in
the material is 7MN/m2. Calculate the power that can be transmitted between pulleys
of 300mm diameter rotating at 1500rpm. Find also the shaft speed in rev/min at
which the power transmitted would be maximum.
7. Calculate the maximum power transmitted by an open belt drive, embracing a pulley
by 120°, if the maximum stress in the belt is not to exceed 140N/cm2. What is the
corresponding linear speed of the belt? Particulars of the belt available are: width =
10cm, thickness = 6mm, ρ = 0.97g/cm2, μ = 0.3
8. A V-belt of 6.5cm2 cross section has a groove angle of 30° and an angle of
lap/contact of 160°, μ = 0.1. The mass of the rope is 1.45kg/m run. The maximum
safe stress is 840N/cm2. Calculate the power that can be transmitted at 25m/s.
[Answer: 75.12kW]
9. Explain in detail three (3) types of belt that used in real engineering applications.
(3~5 pages)
- GOOD LUCK -