Frictional Properties of Automatic Transmission Fluids: Part II—Origins of Friction–Sliding Speed Behavior

Ingram, M.; Noles, J.; Watts, Raymond F.; Harris, Steven G.; Spikes, H. A.

doi:10.1080/10402004.2010.531889

Cited by 38 publications

(35 citation statements)

References 40 publications

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“…PAO had a negative curve at both 40 and 80°C as shown in Fig. 6(a) comparable to the previous study [21]. The overall frictional trend was the same when FMAC-A was added (Fig.…”

Section: Xps Analysissupporting

confidence: 76%

Advanced Control of Frictional Properties on Paper Clutch Materials by a Combination of Friction Modifiers

2017

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This study proposes a novel approach for controlling frictional performances at paper clutch systems by a combination of organic friction modifiers (OFMs). The OFMs are commonly used for modifying the frictional properties at the paper clutch. Although the effect of the OFMs tends to be dependent on temperature due to their working mechanism based on the surface adsorption, the frictional properties are preferable to be stable in all the operating temperature for the consistent and precise clutch control. Aiming to modify the temperature dependence of the OFM effect, an OFM with an Advanced Concept (FMAC) was newly developed, and the impact on the clutch frictional performance was investigated using Low Velocity Friction Apparatus (LVFA). Only with the conventional OFM, the friction values experienced excessive reduction at 80 or 120°C, while an optimal property was achieved at 40°C. In the presence of the FMAC, it was possible to inhibit the conventional OFM selectively at the high temperature conditions preventing the friction reduction, leading to the ideal frictional property in all the temperature conditions. The surface analysis revealed that the FMACs were capable of adsorbing on the substrate more intensively at high temperature, which should be the reason of the temperature dependent competitive effect of the FMACs.

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“…PAO had a negative curve at both 40 and 80°C as shown in Fig. 6(a) comparable to the previous study [21]. The overall frictional trend was the same when FMAC-A was added (Fig.…”

Section: Xps Analysissupporting

confidence: 76%

Advanced Control of Frictional Properties on Paper Clutch Materials by a Combination of Friction Modifiers

2017

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“…When the sliding speed increases the contact surfaces will be soft and the friction will decrease. The relation between the friction and the sliding speed plays an important role to determine the shudder possibility of any clutch system [14,15].…”

Section: Introductionmentioning

confidence: 99%

Temperature analysis of a pin-on-disc tribology test using experimental and numerical approaches

Abdullah

Schlattmann

2016

Friction

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Abstract:The high thermal stresses generated at the interface between the contacting surfaces due to the sliding between parts of sliding system such as friction clutches and brakes. In this work, pin-on-disc test rig was built to find the temperature field during the sliding operation using experimental and numerical approaches. In the experimental approach, infrared camera was used to find the temperature distribution, while in the numerical approach a finite element technique has been used. Analysis has been completed using three-dimensional model to simulate a pin-on-disc system. The numerical results have shown a good agreement compared with the experimental results.

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“…boundary friction increasing with mean speed; Figure ) with gear oils 2, 4 and 5 is an indication of the formation of an effective film, derived possibly from organic FM present in these gear oils. Such low‐speed low‐friction behaviour is attributed to adsorbed films from FM as reported in a similar study by Topolovec‐Miklozic et al ., Ingram et al . and Campen et al .…”

Section: Discussionmentioning

confidence: 59%

Influence of temperature on the friction performance of gear oils in rolling-sliding and pure sliding contacts

et al. 2013

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The friction behaviour of five different gear oils in rolling–sliding and pure sliding contacts and how temperature influences their friction properties were investigated. It is found that increasing temperature decreases boundary friction with gear oils that contain friction modifiers while not for other gear oils, at all contact pressures investigated. In mixed lubrication region, temperature decreases friction at low contact pressures while increases friction at high contact pressures. The effect of slide–roll ratio on friction is significant in boundary lubrication region especially at higher temperature while less significant in mixed lubrication region at both low and high temperatures. The ranking of gear oils for friction in boundary and mixed lubrication regimes is similar both in rolling–sliding and pure sliding contacts, regardless of temperature. Copyright © 2013 John Wiley & Sons, Ltd.

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Frictional Properties of Automatic Transmission Fluids: Part II—Origins of Friction–Sliding Speed Behavior

Cited by 38 publications

References 40 publications

Advanced Control of Frictional Properties on Paper Clutch Materials by a Combination of Friction Modifiers

Advanced Control of Frictional Properties on Paper Clutch Materials by a Combination of Friction Modifiers

Temperature analysis of a pin-on-disc tribology test using experimental and numerical approaches

Influence of temperature on the friction performance of gear oils in rolling-sliding and pure sliding contacts

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