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Simulation of Hydrodynamic Forces on Passenger Car Synchronizer Rings During Rattling

[+] Author Affiliations
Peter Fietkau, Axel Baumann, Bernd Bertsche

University of Stuttgart, Stuttgart, Germany

Paper No. IJTC2011-61030, pp. 179-182; 4 pages
  • ASME/STLE 2011 International Joint Tribology Conference
  • ASME/STLE 2011 Joint Tribology Conference
  • Los Angeles, California, USA, Oct 24–26, 2011
  • ISBN: 978-0-7918-5474-7
  • Copyright © 2011 by ASME


This paper presents a model to calculate hydrodynamic forces on a rattling synchronizer ring, i.e. a ring which is excited by rotational speed irregularities and therefore moves within its functional clearance. Based on the Reynolds Equation an analytical and a numerical solution for determination of the forces resulting from oil films on the ring are derived. The model is implemented in a user force element for the multi-body simulation environment SIMPACK and sample simulations with a simple experimental transmission are presented. The results show that the model is capable of representing the rattle characteristic of a synchronizer ring.

Copyright © 2011 by ASME



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