Relations Between Temperature in Friction Surface and Degradation of Friction Materials During Engaging of Wet Friction Paper

Osanai, Hiroshi; Ikeda, Kunihiko; Kato, Koji

doi:10.4271/900553

Cited by 27 publications

(7 citation statements)

References 2 publications

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“…This decreases the CoF at high sliding speeds. This failure mechanism is observed for paper friction materials in wet clutches as well [29,30]. A polymer matrix with excellent heat resistance enables safer and more comfortable shifting operations and extends the service life of a Carbon-based wet clutch [8].…”

Section: Introductionmentioning

confidence: 94%

Experimental investigations of spontaneous damage to wet multi-plate clutches with carbon friction linings

Groetsch

Stockinger

Schneider

et al. 2021

Forsch Ingenieurwes

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Safety and comfort, while ensuring torque transfer capability, are essential for wet multi-plate clutches. The safety of the torque transmission process largely depends on the endurance of the tribological system against spontaneous and long-term damages. Modern Carbon friction linings in wet multi-plate clutch applications offer superior wear resistance compared to other friction materials, but there is hardly any published data on their spontaneous damage behavior. This article therefore presents results from experimental studies on the spontaneous damage of innovative Carbon friction linings carried out on a component test rig. Furthermore, the influence of different steel plate thicknesses (3.5 mm vs. 6 mm) was investigated. 16 step tests, including visual assessments of the clutches, were performed with Carbon-fiber reinforced plastic (CFRP) and Carbon-fiber reinforced Carbon (C/C) linings in brake operations.The results of the step tests are documented in friction work over friction power diagrams. Results show excellent endurance of modern Carbon friction linings against spontaneous damage and thus makes them suitable for safety relevant high-performance applications. There was no clear influence of the steel plate thickness on spontaneous damage. However, the C/C friction lining ran at a specific energy of up to 5.26 J/mm2 in combination with sliding velocities of up to 67 m/s (high speed application) without failure. This is the highest published spontaneous damage resistance identified for wet clutches.

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Section: Introductionmentioning

confidence: 94%

Experimental investigations of spontaneous damage to wet multi-plate clutches with carbon friction linings

Groetsch

Stockinger

Schneider

et al. 2021

Forsch Ingenieurwes

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“…Clutch friction is greatly influenced by the clutch contact temperature [25][26][27] and sliding speed. 10,27 According to earlier investigations, [25][26][27] it is well established that the friction coefficient tends to decrease at higher contact temperature. It is also desirable to have a stable normal load to get a less load-dependent clutch control.…”

Section: Temperature and Load Variation Investigation At Different Stagesmentioning

confidence: 99%

Water contamination effect in wet clutch system

Fatima

Marklund

Larsson

2012

Proceedings of the Institution of Mechanical Engineers, Part D:

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Water contamination in wet clutch systems can be a problem since both torque characteristics and wear resistance can be influenced by the presence of water. The present paper reveals the effect of externally added water on the wet clutch frictional performance. Commercially available standard paper-based friction plates and steel separator plates lubricated with commercially available automatic transmission fluid were investigated in a recently developed automated test rig using a well-confined experimental approach. Frictional response was observed for three different situations with different amounts of water and different exposure times. An undesirable friction increase is observed with increasing amounts of water in the system. The rate of increase in friction coefficient does not linearly depend on the amount of added water, and this is a noticeable outcome from the common possible water contamination effects, such as change in lubricant viscosity, inadequate additive performance and weakening of the friction material. The greater reduction in the separator plates' surface roughness (R a ) in a water contaminated clutch system compared to an uncontaminated one may be a reason for the change in friction. It is also shown that different water exposure time has no great impact on the change in friction level and the separator plates' roughness.

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“…Adhesive wear occurs when a friction material is under sliding against the mating surface, in which debris particles are formed due to the removal of the weakest asperities by the mechanism of plastic deformation. Thermal degradation occurs when the interface temperature is relatively high, such that the carbonization process of the cellulose fiber and the resin content in the friction material takes place [15,16].…”

Section: Introductionmentioning

confidence: 99%

Distinguishing the effects of adhesive wear and thermal degradation on the tribological characteristics of paper-based friction materials under dry environment: A theoretical study

Ompusunggu

Sas

Brussel

2015

Tribology International

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Relations Between Temperature in Friction Surface and Degradation of Friction Materials During Engaging of Wet Friction Paper

Cited by 27 publications

References 2 publications

Experimental investigations of spontaneous damage to wet multi-plate clutches with carbon friction linings

Experimental investigations of spontaneous damage to wet multi-plate clutches with carbon friction linings

Water contamination effect in wet clutch system

Distinguishing the effects of adhesive wear and thermal degradation on the tribological characteristics of paper-based friction materials under dry environment: A theoretical study

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