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Masters Thesis | Mechanical Engineering | India | Volume 12 Issue 9, September 2023 | Popularity: 5.3 / 10

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Analysis and Design Optimization of Hallow Section Valve Springs

Jagadish R. Bagali, R. S. Matti, B. S. Vivekanand

Abstract: Valve spring is designed for fatigue life and the natural frequency of the valve spring is an important performance measure apart from the stress and deflection [7,8,9]. The natural frequency of the valve spring should be as high as possible to avoid spring resonance at higher engine speeds and consequently the valve floating. In this work a hallow section spring with free length 59 mm, mean diameter 33.58 mm and outer wire diameter of 5 mm is considered [9]. The pitch and the inner diameter are varied to study the effect on the stress induced, deflection and natural frequencies of the spring [1]. The material considered for the analysis is chrome vanadium steel. The analytical equations are modified to include hallow section and the effect of helix angle [2]. The spread sheet program is used to determine different stresses, deflection, and natural frequency for different dimensions of the spring. The spread sheet program is also used for the purpose of selecting optimized springs among the sample data generated. The analytical results are validated using Ansys 2022R1. The bore ratio vs natural frequency curve has the highest slope and hence natural frequency change is highest with unit change in bore ratio.

Keywords: Hallow helical springs, valve springs, fatigue life, natural frequency, spring optimization

Edition: Volume 12 Issue 9, September 2023

Pages: 533 - 541

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