Power is transmitted between two shafts by a V-belt whose mass is 0.9 kg/m length. The maximum permissible tension in the belt is limited to 2.2 kN. The angle of lap is 170° and the groove angle 45°. If the coefficient of friction between the belt and pulleys is 0.17, find : 1. velocity of the belt for maximum power; and 2. power transmitted at this velocity. Note: Sketch the belt drive system for both parts and label the given data on it.

Homework 2 A pulley is driven by a flat belt, the angle of lap being 120º. The belt is 100 mm wide by 6 mm thick and density1000 kg/m3. If the coefficient of friction is 0.3 and the maximum stress in the belt is not to exceed 2 MPa, find the greatest power which the belt can transmit and the corresponding speed of the belt.

Q3: An open belt drive with (200 and 150 mm) pulleys diameters, and the central distance equal to (0.5 m). The larger pulley speed is (500 r.p.m.), and the coefficient of friction between the belt and the pulley is (0.35). Calculate the power transmitted by the belt drive when the maximum tension on the belt equal to (2200 N).

. Find the width of the belt, necessary to transmit 7.5 kW to a pulley 300 mm diameter, if the pulley makes 1600 r.p.m and the coefficient of friction between the belt and the pulley is 0.22. Assume the angle of contact as 210° and the maximum tension in the belt is not to exceed 8 N/mm width.

5. Arough rule for leather belt is that effective tension in it, shall not exceed 15 N/mm of width for a belt of 10 mm thickness. This rule is applied to determine width of belt required to transmit 37 kW, under the following conditions : Angle of lap = 165°; Coefficient of friction = 0.3; Velocity of belt = 1500 m/min; Density of leather = 950 kg/m³. Find the width of belt required. Assuming limiting friction between belt and pulley rim, find the stress in the belt. [Ans. 140 mm ; 1.48 MPa]

Question 4 A pulley is driven by a flat belt, the angle of lap being 120°. The belt is 100 mm wide by 6 mm thick and density is 1000 kg/m. If the coefficient of friction is 0.3 and the maximum stress in the belt is not to exceed 1.5 MPa. Calculate: 4.1. 4.2. the speed of the belt in m/s using the information related to driving pulley. the centrifugal tension and the tension on the first tight side of the belt T1. the greatest power the belt can transmit. 4.3

A multi-disk clutch consists of two steel disks with one bronze disk. Theinner and outer diameters of the contacting surfaces are 200 and 250 mmrespectively. The coefficient of friction is 0.1 and the maximum pressurebetween the contacting surfaces is limited to 0.4 N/mm2. Assuming uniformwear theory, calculate the required force to engage the clutch and the powertransmitting capacity at 720 rpm

A double-ply leather belt transmits 10 hp from a motor with a pulley 8-in. in diameter, running at 1700 rom, to a 24-in. diameter pulley. The difference in tension may be taken as 20 lb/in. of belt width. Belt thickness is 0.2. Calculate the required width of belt

Two parallel shafts whose centre lines are 4 m apart, are connected by an open belt drive. The diameter of the larger pulley is 1.8 m and that of smaller pulley 3 m. The initial tension in the belt when stationary is 3 kN. The coefficient of friction between the belt and the pulley is 0.3. Calculate the power transmitted, when the smaller pulley rotates at 550 r.p.m. and length of the belt.

V-belt calculation