This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
A New Methodology for Calculating and Modelling Non-Linear Springs in the Valve Train of Internal Combustion Engines
Technical Paper
2011-01-0780
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
The valve return springs in the distribution chain of internal combustion engines constitute a fundamental component for the duration, efficiency and performance of the engine itself [1,2,3,4]. This is even more true for high-performance engines whose mechanical and thermal power leads to the premature deterioration of poorly designed components. The elevated forces in such engines necessitate, where the valve springs have not been substituted by alternative kinematic systems, progressive springs, i.e. springs with variable stiffness. Despite this fact, the literature does not contain any univocal methods for defining the geometry of this type of spring. In the present study, the question is approached on the basis of a numerical-iterative calculation, providing a general methodology which, starting from data regarding the functioning of the engine and the geometric volumes to be respected, leads to the definition of the optimal geometry of the helix, taking account of the trend of the stiffness, of the natural frequencies and of the loads over the entire operating range of the spring. Tests on springs calculated in this way were performed using multi-body software, in order to verify the correspondence between the initial design data and the real behaviour of the geometry generated.
Recommended Content
Authors
Citation
Sequenzia, G., Oliveri, S., Calabretta, M., Fatuzzo, G. et al., "A New Methodology for Calculating and Modelling Non-Linear Springs in the Valve Train of Internal Combustion Engines," SAE Technical Paper 2011-01-0780, 2011, https://doi.org/10.4271/2011-01-0780.Also In
References
- Schamel, A. R. Hammacher, J. Utsch, D. “Modeling and Measurement Techniques for Valve Spring Dynamics in High Revving Internal Combustion Engines,” SAE Technical Paper 930615 1993 10.4271/930615
- Zhu, G Taylor, C.M. “ Tribological Analysis and design of Modern Automobile Cam and Follower ” Dowson, D. Professional Engineering Publishing Ltd London and Bury St. Edmunds, UK 2001
- Calabretta, M. Cacciatore, D. Carden, P. “Valvetrain Friction - Modeling, Analysis and Measurement of a High Performance Engine Valvetrain System,” SAE Int. J. Engines 3 2 72 84 2010 10.4271/2010-01-1492
- Carden, P. Pendlebury, K. Zuhdi, N. Whitehead, A. “Design and Development of the Valve Train for a Racing Motorcycle Engine,” SAE Technical Paper 2007-01-0264 2007 10.4271/2007-01-0264
- Bocchi, G. “Motori a quattro tempi” Milano, Hoepli 1988
- Juvinall, R.C. Marshek, K.M. “Fundamentals of Machine Component Design” John Wiley & Sons Inc.
- Vignocchi, D. “Elementi diprogettazione del motore” ATHENA 1998
- Garro, A. “Progettazione strutturale del motore” Levrotto Torino, Bella 1994
- Diana, G. Cheli, F. “Dinamica e vibrazioni dei sistemi meccanici (Vol.I II)” UTET Libreria 2005
- Nerli, G. “Lezioni di costruzioni di macchine” Levrotto Torino, Bella 1990
- Pennestrì, E. “Dinamica tecnica e computazionale - Sistemi Multibody (Vol.II)” Casa Editrice Ambrosiana 2005
- ADAMS/Solver 2005r2 User Guide