Study on the High Temperature Friction and Wear Behaviors of Cu-Based Friction Pairs in Wet Clutches by Pin-on-Disc Tests

Zhao, Er-Hui; Ma, Bin; Li, Heyan

doi:10.1155/2017/6373190

Cited by 16 publications

(13 citation statements)

References 18 publications

(18 reference statements)

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“…Because the specific heat of the oil is much larger than other components, it takes a long time to increase the oil temperature obviously. However, much quantity of friction heat generated in this period gives rise to a sharp rise of the clutch temperature and the temperature has a dramatic influence on COF [9]. Therefore, the simulation is happened in a long time status with low speed and pressure in order to minimize the interference of other variables.…”

Section: The Simulation Of the Average Temperature Rise Characteristicsmentioning

confidence: 99%

The Thermal Characteristics of a Wet Multi-Disc Clutch with Provision for Lubrication Flow

Ma¹,

Yu²,

Li³

et al. 2018

International Conference of Energy Harvesting, Storage, and Transfer

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-In order to obtain the temperature variations of the clutch hydraulic system, a thermal resistance network model is developed and the lumped parameter analysis is conducted with the relative speed, applied pressure and lubrication flow taken into account. The predicted temperature rises of the clutch and the oil are compared with experimental data. The effects of these parameters on the temperature rise are investigated. Results demonstrate that the thermal model is evaluated as effective and can predict the temperature variations accurately. High relative speed and high applied pressure contribute to the high temperature of the clutch and the oil. However, the larger the lubrication flow, the slower the temperature rise of the clutch, and the faster the temperature rise of the oil. The cooling effect is absolutely obvious with high clutch temperature, while it is not enhanced conspicuously with the lubrication flow increase. Furthermore, the conclusions are of prime importance in efficiency improvements on the thermal management of the clutch system.

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Section: The Simulation Of the Average Temperature Rise Characteristicsmentioning

confidence: 99%

The Thermal Characteristics of a Wet Multi-Disc Clutch with Provision for Lubrication Flow

Ma¹,

Yu²,

Li³

et al. 2018

International Conference of Energy Harvesting, Storage, and Transfer

Self Cite

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“…The thermal degradation of the paper-based friction material had three stages, which were 250-370℃, 370-600℃, and 600-850℃, and the maximum mass loss happened in stage two due to the carbonization and oxidation of resin and fibers. Zhao et al [11] investigated the friction and wear behaviors of Cu-based friction material by pin-on-disc tests, and the high temperature wear mechanism was analyzed.…”

Section: Introductionmentioning

confidence: 99%

Friction and Wear Behaviors of Porous Paper-Based Friction Pairs in Wet Clutches by Pin-on-Disc Tests

Zheng¹,

Ma²,

Chen³

et al. 2020

International Conference on Fluid Flow and Thermal Science

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To investigate the friction and wear behaviors of porous paper-based friction material in wet clutches under severe working condition, the dry pin-on-disc tests were carried out by a UMT-5 tribometer. The test results of COF are presented, and the coefficient of variation is calculated and analyzed. To reveal the high temperature wear mechanism of paper-based friction material, the microstructure of worn surfaces is analyzed. The wear mechanism and friction behaviors of paper-based friction material are influenced by the softening, carbonization, and oxidation of fibers and resin. This investigation of friction and wear behaviors under dry working condition can be used to simulate the engagement process and explain the nonuniform wear phenomenon of wet clutches in SAE#2 tests.

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“…A simplified experiment was developed to predict the friction performance of CFM wet clutches by the pin-on-disc test [4]. Zhao et al [5,6] studied the friction and wear characteristics of the CFM by pin-on-disc tests; it was implied that temperature had the greatest influence on the wear loss of lubricated CFM clutches, and the COF witnessed a decrease after an increase with the increase of temperature. Su et al [7,8] investigated the tribological properties of CFM with exogenous copper powder third body.…”

Section: Introductionmentioning

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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Study on the High Temperature Friction and Wear Behaviors of Cu-Based Friction Pairs in Wet Clutches by Pin-on-Disc Tests

Cited by 16 publications

References 18 publications

The Thermal Characteristics of a Wet Multi-Disc Clutch with Provision for Lubrication Flow

The Thermal Characteristics of a Wet Multi-Disc Clutch with Provision for Lubrication Flow

Friction and Wear Behaviors of Porous Paper-Based Friction Pairs in Wet Clutches by Pin-on-Disc Tests

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

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