NOVATEUR PUBLICATIONS INTERNATIONAL JOURNAL OF INNOVATIONS IN ENGINEERING RESEARCH AND TECHNOLOGY [IJIERT] ISSN: 2394-3696 VOLUME 3, ISSUE 2, FEB.-2016 DESIGN AND ANALYSIS OF A FRONT SUSPENSION COIL SPRING FOR THREE WHEELER VEHICLE Mr. Harshad B. Pawar P. G. Student, Mechanical Department, Sahyadri Valley College of Engineering & Technology Rajuri, Pune, Maharashtra, India. Prof. Amol R. Patil Professor, Sahyadri Valley College of Engineering & Technology Rajuri, Pune, Maharashtra, India Dr. Sanjay B. Zope Principal, Sahyadri Valley College of Engineering & Technology Rajuri, Junnar Pune, Maharashtra, India ABSTRACT Basically the spring is a flexible component of suspension system. In Modern transport vehicles usually use light coil springs. For this reason present paper used the analytical methods and finite element analysis for the selection of helical compression spring with number of turns. Using Finite Element Analysis completed the modelling, meshing and post processing of front suspension spring. The present work attempts to analyze the load of the three wheeler vehicle front suspension spring with SP ST GRD II material. This investigation includes comparison of software and theoretical analyses of coil spring made of SP ST GRD II material suggested the suitability for optimum design. This work also determined the structural strength of coil spring using the finite element analysis. Based on theoretical and software result comparison the optimum turns which meet all requirements was suggested. Key Words – coil spring, FEA, optimization, turns INTRODUCTION A spring is defined as an elastic body, whose function is to deform when loaded and to recover its original shape when the load is removed. It is an elastic object used to store mechanical energy. The spring is a very important component of the suspension system that provides ride comfort. The spring supports the weight of the vehicle, maintain ride height and absorb road shock. The most commonly used springs is the helical compression coil spring. The force of a coil spring depends on wire diameter, mean coil diameter, number of coils and materials. The primary design constraints are that the wire size should be commercially available and that the stress at the solid length be no longer greater than the torsional yield strength. For present study the helical compression coil spring of three wheeler front suspension system was consider. LITERATURE REVIEW Y. Prawoto, M. Ikeda, S.K. Manville, A. Nishikawa This paper is a discussion about automotive suspension coil springs, their fundamental stress distribution, materials characteristic, manufacturing and common failures. An in depth discussion on the parameters influencing the quality of coil springs is also presented. To assure that a coil spring serves its design, failure analysis of broken coil springs is valuable both for the short and long term agenda of car manufacturer and parts suppliers. This paper discusses several case studies of suspension spring failures. The failures presented range from the very basic including insufficient load carrying capacity, raw material defects such as excessive inclusion levels, and manufacturing defects such as delayed quench cracking, to failures due to complex stress usage and chemically induced failure. FEA of stress distributions around typical failure initiation sites are also presented. [3] Gajendra Singh Rathore, Upendra Kumar Joshi The objective of this review paper is to provide the information about the fatigue stress for the helical compression spring. Springs are mechanical shock absorber system. A mechanical spring is defined as an elastic body which has the primary function to deflect or distort under load, and to return to its original shape when the load is removed. The researchers throughout the years had given various research methods such as Theoretical, Numerical and