Lecture No 30 Belt Drives NPTEL（没有30皮带传动NPTEL讲座）.pdf

Module 13 Belt drives Version 2 ME , IIT Kharagpur Lesson 1 Introduction to Belt drives Version 2 ME , IIT Kharagpur Instructional Objectives: At the end of this lesson, the students should be able to understand: • Uses and advantages of belt drives • Types of belt drives and their nomenclature • Relationship between belt tensions • Some commonly used design parameters 13.1.1 Flexible Machine Elements Belt drives are called flexible machine elements. Flexible machine elements are used for a large number of industrial applications, some of them are as follows. 1. Used in conveying systems Transportation of coal, mineral ores etc. over a long distance 2. Used for transmission of power. Mainly used for running of various industrial appliances using prime movers like electric motors, I.C. Engine etc. 3. Replacement of rigid type power transmission system. A gear drive may be replaced by a belt transmission system Flexible machine elements has got an inherent advantage that, it can absorb a good amount of shock and vibration. It can take care of some degree of misalignment between the driven and the driver machines and long distance power transmission, in comparison to other transmission systems, is possible. For all the above reasons flexible machine elements are widely used in industrial application. Although we have some other flexible drives like rope drive, roller chain drives etc. we will only discuss about belt drives. 13.1.2 Typical belt drives Two types of belt drives, an open belt drive, (Fig. 13.1.1) and a crossed be