TAILIEUCHUNG - Fundamentals of Machine Design P19

Mechanical springs have varied use in different types of machines. We shall briefly discuss here about some applications, followed by design aspects of springs in general. | Module 7 Design of Springs Version 2 ME IIT Kharagpur Lesson 1 Introduction to Design of Helical Springs Version 2 ME IIT Kharagpur Instructional Objectives At the end of this lesson the students should be able to understand Uses of springs Nomenclature of a typical helical spring Stresses in a helical spring Deflection of a helical spring Mechanical springs have varied use in different types of machines. We shall briefly discuss here about some applications followed by design aspects of springs in general. Definition of spring Spring act as a flexible joint in between two parts or bodies Objectives of Spring Following are the objectives of a spring when used as a machine member 1. Cushioning absorbing or controlling of energy due to shock and vibration. Car springs or railway buffers To control energy springs-supports and vibration dampers. 2. Control of motion Maintaining contact between two elements cam and its follower In a cam and a follower arrangement widely used in numerous applications a spring maintains contact between the two elements. It primarily controls the motion. Creation of the necessary pressure in a friction device a brake or a clutch A person driving a car uses a brake or a clutch for controlling the car motion. A spring system keep the brake in disengaged position until applied to stop the car. The clutch has also got a spring system single springs or multiple springs which engages and disengages the engine with the transmission system. Restoration of a machine part to its normal position when the applied force is withdrawn a governor or valve A typical example is a governor for turbine speed control. A governor system uses a spring controlled valve to regulate flow of fluid through the turbine thereby controlling the turbine speed. 3. Measuring forces Spring balances gages Version 2 ME IIT .

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