Influence of applied pressure on the tribological behaviors of a wet multi-disc clutch during the running-in process

Purpose: This paper aims to explore the influence of applied pressure on the tribological properties of the friction component in a wet multi-disc clutch during the running-in process. Design/methodology/approach: The running-in evolutionary was explored in terms of global friction performance. The variation of friction torque and mean COF of the initial 300 engagement cycles was obtained by full-scale tests. Finally, an optical microscope was used to detect the wear characteristics of friction surfaces. Findings: The applied pressure showed a significant influence on the tribological behaviors of wet clutches during the running-in process. The mean COF decreased and then increases with the increase of the applied pressure. A higher applied pressure contributed to more asperity summits being sheared, thus resulting in a smoother surface. Considering a suitable wore performance, properly applied pressure is necessary. Originality/value: The results provide theoretical guidance for selecting the optimal applied pressure in the running-in of wet clutches. Peer review: The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-08-2022-0256/