Idling wear II


Model for predicting the wear life of frictionally engaged freewheels under idling operation

Motivation :

Frictionally engaged freewheels are automatic clutches and are used for overrunning, indexing and backstopping. Their operation mode is mostly dependent on the direction of rotation. The areas of application are characterized by different percentages of torque transmission (driving operation) and idling. Frictionally engaged freewheels can be operated in these two operating states, so that the freewheel is subjected to different stresses. The model for predicting the fatigue life of freewheels during torque transmission is based on the Lundberg-Palmgren approach. A generally applicable model for predicting the wear life of freewheels during idling operation does not currently exist, so that the design is based mainly on empirical knowledge.

Research Objectives :

The aim of the research project is the development of a validated model for the prediction of the wear life of clamping element freewheels during idling. The methods consider the influencing parameters of size, contact pressure, lubricant viscosity, lubricant additives and speed. Sub-objectives of the project are:

  • Experimental determination of the wear behavior as a function of the influencing parameters listed above
  • Description of the wear processes in the practice-relevant operating range contact models
  • Determination of friction values of practice-relevant tribo pairings
  • Implementation of a user-friendly model to predict the idling wear life

Research and Project Partners

  • Institut für Antriebs- und Fahrzeugtechnik der Universität Kassel
  • Institut für Werkstofftechnik der Universität Kassel
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Promoted by

The Federal Ministry of Economic Affairs and Climate Action

  Copyright: © AIF FVA

Project sponsor

Federation of Industrial Cooperative Research Associations, AiF

Research Association for Drive Technology, FVA