The Running-in Micro-Mechanism and Efficient Work Conditions of Cu-Based Friction Material against 65Mn Steel

Wu, Jianpeng; Ma, Bin; Li, H.; Stanciulescu, Ilinca

doi:10.1007/s40799-019-00323-1

Cited by 12 publications

(6 citation statements)

References 19 publications

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“…Several experimental investigations have been conducted to study the running-in behaviour of tribological components and its influencing operating parameters, such as applied load (Wagner et al , 2017; Rosenkranz et al , 2016), sliding speed (Nogueira et al , 2002; Wu et al , 2019) and surface microtopography (Zhang et al , 2013; Cheng et al , 2015). Such studies are greatly important in understanding the running-in phenomenon.…”

Section: Introductionmentioning

confidence: 99%

Effect of ATF temperature on the friction-wear characteristic of a wet multi-disc clutch during the running-in process

Wang

Zheng

et al. 2022

ILT

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Purpose This paper aims to explore the effect of automatic transmission fluid (ATF) temperature on the dynamic friction-wear properties of the friction component in a wet multi-disc clutch during the running-in process. Design/methodology/approach The running-in evolution was explored in terms of global friction performance and instantaneous friction characteristics. The variation of friction torque of the initial 300 engagement cycles was obtained by wet-clutch tests. Finally, an optical microscope was used to detect the wear mechanism of friction surfaces. Findings The ATF temperature showed a significant effect on the friction-wear performance in the clutch running-in process. The mean coefficient of friction decreased with the increase of the ATF temperature and decreased rapidly in the approximately initial 60 clutch engagements. The higher the ATF temperature was, the thinner the ATF film was, and more asperity summits were cut, thus leading to a smoother surface. Considering the slightly instantaneous friction fluctuation and the wear performance, a proper ATF temperature is necessary. Originality/value The results provide theoretical guidance for selecting the optimal ATF temperature during the running-in process.

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Section: Introductionmentioning

confidence: 99%

Effect of ATF temperature on the friction-wear characteristic of a wet multi-disc clutch during the running-in process

Wang

Zheng

et al. 2022

ILT

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“…Specifically, under a high wear rate, the highest asperity summits have been sheared initially, and the lower asperities emerge. Thus, the deep valleys become shallower after wearing-off of the highest asperities, resulting in smooth worn surfaces (Wu et al , 2019). Therefore, the steady wear stage of the friction components arises quickly.…”

Section: Resultsmentioning

confidence: 99%

“…Fundamental studies into the clutch running-in were mainly based on scaled-down tests. For instance, running-in experiments using pin-on-disc tests under dry conditions were carried out by Wu et al (2019). In their investigations, the effect of temperature, rotation speed and applied load on the running-in duration was studied.…”

Section: Introductionmentioning

confidence: 99%

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

Wang,

Ma,

et al. 2023

ILT

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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/

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“…After the running-in experiments, the friction material will have better bearing characteristics, more stable COF, lower wear rate and energy loss, so as to obtain longer service life. Since the specific procedures and methods for running-in test have been described in our previous studies [26], only the results are presented in the study.…”

Section: Running-in Processmentioning

confidence: 99%

Comparison of the Friction and Wear Characteristics between Copper and Paper Based Friction Materials

Chen

et al. 2019

Materials

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Copper-based friction material (CFM) and paper-based friction material (PFM) are the two most commonly used clutch friction materials. The friction and wear characteristics of these two kinds of friction materials under dry conditions were investigated by the pin-on-disc test over a broad range of applied loads, rotating speeds and ambient temperatures. Before experiments, the running-in test was conducted to stabilize the coefficient of friction (COF) and wear amount of the test samples. After experiments, the metallographic micrographs of the tested samples were presented to investigate the wear mechanisms. Experimental results showed that both the COF and wear depth of the CFM are much greater than these of PFM. The COF of CFM decreases with the increase of applied load, and changes slightly with the variation of rotating speed, whereas it increases first and then decreases with the increase of ambient temperature. However, the COF of PFM decreases dramatically with the increase of the rotating speed and ambient temperature, while it remains stable at first and then decreases slowly as the applied load increases. Additionally, under such three working conditions, the wear depth of CFM changes linearly, while the wear depth of PFM varies greatly. This study can be used as a guide for selecting friction materials for clutches with different applications.

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The Running-in Micro-Mechanism and Efficient Work Conditions of Cu-Based Friction Material against 65Mn Steel

Cited by 12 publications

References 19 publications

Effect of ATF temperature on the friction-wear characteristic of a wet multi-disc clutch during the running-in process

Effect of ATF temperature on the friction-wear characteristic of a wet multi-disc clutch during the running-in process

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

Comparison of the Friction and Wear Characteristics between Copper and Paper Based Friction Materials

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