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Surface Fatigue Design Method for Automotive Components Subjected to Torsional Vibrations in Modern Engine Applications
ISSN: 0148-7191, e-ISSN: 2688-3627
Published November 11, 2014 by SAE International in United States
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Nowadays the challenge in design of auxiliary devices for automotive small engines is focused on packaging reduction and on the increase of the performance. These requirements are in contrast to each other and in order to fulfil the project specifications, new and more refined design tools and procedures need to be developed.
This paper presents a calculation loop developed by Pierburg Pump Technology Italy S.p.A. (PPT). It supports the design of a variable displacement oil pump component for engine applications.
The work is focused on the fatigue life evaluation of a joint, which transmits the drive torque from the engine to the oil pump.
The aim of the procedure is to calculate the onset of the surface fatigue phenomenon in the hexagonal joint which drives the oil pump, taking into account the axes misalignment and the flat-to-flat clearance.
The study has involved several matters, experimental measures, CFD, MBA and FEM analyses. A calculation procedure has been set up in order to consider all the necessary loads applied on the joint.
The CFD analysis defines the hydraulic resistance loads on the pump. The FEM analysis is used to define the joint contact behaviour in terms of stress and strain and the surface pressure on the driving surfaces. The MBA defines the dynamical behaviour of the joint and it works out the load time history. The input shaft rotational velocity is imposed. It is obtained via experimental measures of the rotational velocity taken on the fired engine.
The presented surface fatigue analysis method is a hybrid methodology which involves several calculation software packages and experimental data. The method is useful to design and verify drive joints subjected to torsional vibration, which typically undergo the pitting phenomenon.
In the end, this new design tool in the PPT know how portfolio has led to a better products knowledge and to time-to-market reduction.
CitationFranceschini, A., Pellegrini, E., and Squarcini, R., "Surface Fatigue Design Method for Automotive Components Subjected to Torsional Vibrations in Modern Engine Applications," SAE Technical Paper 2014-32-0026, 2014, https://doi.org/10.4271/2014-32-0026.
- MSC Software Corporation ADAMS View Software Support-Help 2013 2
- Ciulli E. Elementi di Meccanica (Fundamentals of Mechanics Pisa University Press 2013
- Palmgren A. G. Die Lebensdauer von Kugellagern Zeitschrift des Vereines Deutscher Ingenieure (VDI Zeitschrift) 0341-7258 68 14 April 1924 339 341
- Miner M.A. Cumulative Damage in Fatigue Journal of Applied Mechanincs 1945 12 A159 A164
- Fatemi A. , Yangt L. Cumulative fatigue damage and life prediction theories: a survey of the state of the art for homogeneous materials International Journal of Fatigue 20 1 9 34 1998
- Socie , D. and Marquis , G. Multiaxial Fatigue Warrendale Society of Automotive Engineers, Inc. 1999 10.4271/R-234
- Juvinall R.C. , Marshek K.M. Fundamentals of Machine Component Design 3rd John Wiley & Sons 2003