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Lubricants 2016, 4(2), 18; doi:10.3390/lubricants4020018

The Role of Counter-Face Roughness on the Tribological Performance of a Clutch System Tested with a Pin-On-Disc Tribometer

1
ZF Brazil Company—TNB Business Unit, SBC, 09891-901, Brazil
2
Polytechnic School Department, University of São Paulo, São Paulo, 05508-030, Brazil
*
Author to whom correspondence should be addressed.
Academic Editors: Werner Oesterle and Ga Zhang
Received: 18 February 2016 / Revised: 20 April 2016 / Accepted: 21 April 2016 / Published: 31 May 2016
(This article belongs to the Special Issue Tribofilms and Solid Lubrication)
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Abstract

This study was a continuous investigation of the roles played by the tribofilm on dry automotive clutch system performance. Tribological experiments were performed by the addition of wear debris at the beginning of tribometer tests and by reducing the surface roughness of a cast iron counter-face. The initial surface conditions of cast discs were 0.2 and 1.2 µm. The pin-on-disc tests were carried out at three different PV levels: 3.08, 7.88, and 10.09 MPa·ms−1, and the current results were correlated to those previously obtained in the standard tribometer procedure. When the wear debris was added into the tribosystem, the friction coefficient level dropped drastically while the assembly wear rate rose. In contrast, the modified cast discs provided a reduced wear rate of assembly and a higher and more stable friction coefficient level. These improvements were obtained in a severe condition where higher temperature levels were reached. For the tests with added debris, SEM observations revealed a more intense tribofilm development over the worn surfaces of the clutch friction material. The smoothest cast disc did not damage the developed tribofilms and maintained them more stably due to a reduction in contact area stresses at the highest tribometer test. View Full-Text
Keywords: dry clutch friction material; tribofilm; pin-on-disc tribometer; metallic counter-face roughness dry clutch friction material; tribofilm; pin-on-disc tribometer; metallic counter-face roughness
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Fernandes, G.; Zanotto, P.; Sinatora, A. The Role of Counter-Face Roughness on the Tribological Performance of a Clutch System Tested with a Pin-On-Disc Tribometer. Lubricants 2016, 4, 18.

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