The MTM Clutch Screening Method was used; this test configuration, which has been successfully used at Imperial College London, UK (1) and Powertrib, Oxford UK (2), utilises the pin-on-disc mode in the MTM, to provide a pure sliding contact at pressures similar to that of a wet clutch. This can be used for the accurate screening of additives and in-depth investigation of the wet clutch friction behaviour.
The figure below exhibits a set of results obtained with this test configuration. The friction against sliding speed characteristics of a friction modifier (FM), a dispersant (Disp) and a detergent (Det) are shown.
Table 1: Possible MTM Wet Clutch Test Specifications
(1) Tribology Transactions, 54: 145-153, 2011