Abstract
In controlled, dry-running clutch systems with organically bonded friction linings and metallic friction counterparts, negative friction coefficient gradients, namely friction coefficients decreasing with the sliding velocity, can lead to 'juddering' of the drive train during the slip phases of the clutches. A specifically developed test method together with the use of near-surface analysis procedures such as confocal laser scanning microscopy (CLSM) and micro X-ray fluorescence spectroscopy (µXRF) can prove that the mechanisms causing the negative friction coefficient gradients result from the formation of metallic oxide wear particle plateaus in the organically bonded friction linings. Based on this, the study illustrates how the friction coefficient gradient can be influenced by the topography and material characteristics of the metallic friction counterpart.
Published Version
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