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The operating principle of this type of brake is the following. A flexible band of leather or rope or steel with friction lining is wound round a drum. Frictional torque is generated when tension is applied to the band. It is known (see any text book on engineering mechanics) that the tensions in the two ends of the band are unequal because of friction and bear the following relationship: | Module 12 Design of Brakes Version 2 ME IIT Kharagpur Lesson 2 Design of Band and Disc Brakes Version 2 ME IIT Kharagpur Instructional Objectives After reading this lesson the students should learn Different types of band brakes Design of band brakes Design of disc brakes Properties of friction materials 1. Band brakes The operating principle of this type of brake is the following. A flexible band of leather or rope or steel with friction lining is wound round a drum. Frictional torque is generated when tension is applied to the band. It is known see any text book on engineering mechanics that the tensions in the two ends of the band are unequal because of friction and bear the following relationship T e p Z where Z tension in the taut side T2 tension in the slack side H coefficient of kinetic friction and p angle of wrap. If the band is wound around a drum of radius R then the braking torque is T Z -Z R Z 1 -e p R Depending upon the connection of the band to the lever arm the member responsible for application of the tensions the band brakes are of two types a Simple band brake In simple band brake one end of the band is attached to the fulcrum of the lever arm see figures 12.2.1 a and 1 b . The required force to be applied to the lever is P T for clockwise rotation of the brake drum and 11 Version 2 ME IIT .
