Title: Friction screening test method for wet multi-plate clutches

Authors: Ulrich Stockinger; Robert Acuner; Katharina Voelkel; Hermann Pflaum; Karsten Stahl

Addresses: Department of Mechanical Engineering, Gear Research Centre (FZG), Technical University of Munich, Boltzmannstraße 15, D-85748 Garching b. München, Germany ' Manager System Engineering Hybrid and e-Drive, Magna Powertrain, Hermann-Hagenmeyer-Str. 1, 74199 Untergruppenbach, Germany ' Department of Mechanical Engineering, Gear Research Centre (FZG), Technical University of Munich, Boltzmannstraße 15, D-85748 Garching b. München, Germany ' Department of Mechanical Engineering, Gear Research Centre (FZG), Technical University of Munich, Boltzmannstraße 15, D-85748 Garching b. München, Germany ' Department of Mechanical Engineering, Gear Research Centre (FZG), Technical University of Munich, Boltzmannstraße 15, D-85748 Garching b. München, Germany

Abstract: Knowing the friction behaviour of wet multi-plate clutches is crucial when developing a new clutch system. Many parameters, which cannot be predicted or determined by simulations, influence the friction behaviour. This is why developing new transmission fluids and friction linings requires experiments. This paper describes an efficient test method to determine the friction behaviour of different types of friction linings with different lubricants. The experiments' results characterise influences of additives on the friction behaviour for the running-in process, over various load stages, and during continuous shifting tests. The method is introduced to repeatably and reproducibly evaluate the coefficient of friction and tendency of the clutch to shudder.

Keywords: multi-plate clutch; friction screening test method; additive effects; data evaluation; paper friction lining; sinter friction lining; carbon friction lining.

DOI: 10.1504/IJPT.2021.120945

International Journal of Powertrains, 2021 Vol.10 No.4, pp.336 - 357

Received: 16 Apr 2020
Accepted: 10 Sep 2020
Published online: 18 Feb 2022 *

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