Study on the groove area effects on the friction-wear properties of a Cu-based wet clutch

Yu, Liang; Ma, Bin; Changsong, Zheng; Chen, Man; Wang, Qian; Zhang, Bin

doi:10.1016/j.triboint.2021.107096

Cited by 14 publications

(8 citation statements)

References 27 publications

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“…As the ATF film is cracking and the asperity summit shearing, the pressure begins to fluctuate. Subsequently, the friction torque increases rapidly at t b because of the prompt increase of the interacting asperity area (Yu et al, 2021;Zhao et al, 2017aZhao et al, , 2017b. However, the rotational speed does not decrease immediately because of the inertia until time t c .…”

Section: Experimental Methodsmentioning

confidence: 99%

“…The tested data is recorded every ten cycles. Based on the common working conditions in clutches, the initial rotational speed and applied pressure are selected as 1200 rpm and 1.2 MPa, and the flow rate of the ATF is 4 mL/(min·cm 2 ) (Yu et al , 2021). The inertia is 0.248 kg·m 2 in this standard clutch test rig.…”

Section: Experimental and Data Processing Methodsmentioning

confidence: 99%

“…Wet multi-disc clutches are widely used for power shifting in automatic transmissions (Wang et al , 2019; Lin et al , 2018; Yu et al , 2021). They commonly include multiple friction discs and separator plates arranged alternately and execute torque transfer with relative rotation and complex contacting friction (Yu et al , 2020).…”

Section: Introductionmentioning

confidence: 99%

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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: Experimental Methodsmentioning

confidence: 99%

Section: Experimental and Data Processing Methodsmentioning

confidence: 99%

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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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“…Supposing that the applied pressure is uniformly distributed on the friction surface, the instantaneous COF μ(τ) can be figured by [40]:…”

Section: Characterization Of the Friction-wear Propertiesmentioning

confidence: 99%

“…In general, when the mean COF is smaller than a certain value, the engagement time will be prolonged, even worse the engagement will be a failure. The mean COF can be calculated as follows [40].…”

Section: Characterization Of the Friction-wear Propertiesmentioning

confidence: 99%

Effect of Silicon Carbide Nanoparticles on the Friction-Wear Properties of Copper-Based Friction Discs

Zheng

et al. 2022

Materials

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To study the influence of nano-additives on the friction-wear characteristics of friction materials, the nano-sized silicon carbide particles which have excellent chemical and physical properties are considered to add in composite to form the modified friction material. The influence of the silicon carbide nanoparticles (SCN) on the friction-wear characteristics of copper-based friction materials (CBFM) is investigated via the SAE#2 (made in Hangzhou, China) clutch bench test with the applied pressure, rotating speed, and automatic transmission fluid (ATF) temperature taken into account. Moreover, the variations of friction torque and temperature are considered to evaluate the friction performance, and the variable coefficient is employed to describe the friction stability. The wear characteristics of friction materials are investigated by the disc changes in thickness and micro-morphology. The results show that the CBFM with SCN can provide a higher friction torque, which increased by 30% to 50% compared with CBFM. The variable coefficient of CBFM with SCN changes from 674 to 52 with the rotating speed raised from 600 rpm to 3000 rpm, which shows that the friction stability is relatively worse. Furthermore, the micromorphology shows that the CBFM with SCN has lower porosity and surface roughness, which increases the microscopic contact area and the coefficient of friction (COF). Simultaneously, the reduction in porosity also leads to a decrease in the cooling quality, bringing about a rapid temperature rise. Thus, the wear amount of CBFM with SCN increases significantly, especially for the friction disc in the axial middle position.

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Optimizing Tribological Performance of Laser-Induced Elliptical Textures on Nickel Aluminum Bronze Surface based on Genetic Algorithm

Gurav

Bharatish

Rajkumar

et al. 2022

J. of Materi Eng and Perform

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Study on the groove area effects on the friction-wear properties of a Cu-based wet clutch

Cited by 14 publications

References 27 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

Effect of Silicon Carbide Nanoparticles on the Friction-Wear Properties of Copper-Based Friction Discs

Optimizing Tribological Performance of Laser-Induced Elliptical Textures on Nickel Aluminum Bronze Surface based on Genetic Algorithm

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