# V belt and rope drives

19 Aug 2017
1 sur 29

### V belt and rope drives

• 1. Contents 1 Notations 2 2 Types of V-belts and Pulleys 3 3 Standard Pitch Lengths of V-belts 3 4 Advantages and Disadvantages of V-belt Drive over Flat Belt Drive 4 5 Ratio of Driving Tensions for V-belt 5 6 V-ﬂat Drives 6 7 Rope Drives 6 8 Fiber Ropes 6 9 Advantages of Fiber Rope Drives 6 10 Sheave for Fiber Ropes 7 11 Ratio of Driving Tensions for Fiber Rope 7 12 Wire Ropes 7 13 Advantages of Wire Ropes 7 14 Construction of Wire Ropes 8 15 Classiﬁcation of Wire Ropes 8 16 Designation of Wire Ropes 9 17 Properties of Wire Ropes 9 18 Diameter of Wire and Area of Wire Rope 10 19 Factor of Safety for Wire Ropes 11 20 Wire Rope Sheaves and Drums 11 21 Wire Rope Fasteners 12 22 Stresses in Wire Ropes 12 23 Procedure for Designing a Wire Rope 14 24 Examples 15 25 References 29 26 Contacts 29
• 2. 1 Notations • R1 = Normal reactions between belts and sides of the groove. • R = Total reaction in the plane of the groove. • µ = Coeﬃcient of friction between the belt and sides of the groove. • W = Load lifted. • w = Weight of the rope. • A = Net cross-sectional area of the rope. • Er = Modulus of elasticity of the wire rope. • dw = Diameter of the wire. • D = Diameter of the sheave or drum. • A = Net cross-sectional area of the rope. • n = The total number of wires in the rope section. • a = Acceleration of the rope and load. • g = Acceleration due to gravity. • h = Slackness in the rope. • l = Length of the rope.
• 3. 2 Types of V-belts and Pulleys Figure 1: V-Belt and V-grooved pulley. Note: Face width (B) = (n − 1) e + 2 f 3 Standard Pitch Lengths of V-belts According to IS: 2494-1974, the V-belts are designated by its type and nominal inside length. For example, a V-belt of type Aand inside length 914 mm is designated as A914IS: 2494. The standard inside lengths of V-belts in mm are as follows: 610, 660, 711, 787, 813, 889, 914, 965, 991, 1016, 1067, 1092, 1168, 1219, 1295, 1372, 1397, 1422, 1473, 1524,