Numerical and Experimental Studies of the Attenuation Characteristics of Friction Torque in a Wet Multidisc Clutch

Chen, Man; Bin, Zhang; Feng, Yunhe; Wang, Liang; Wang, He

doi:10.3390/app11020814

Cited by 4 publications

(3 citation statements)

References 20 publications

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“…A spline friction force will generate during the axial movement of discs [30,31]. For the friction discs, the spline friction force is deduced as:…”

Section: Spline Resistance Modelmentioning

confidence: 99%

Influence of the Lubrication Oil Temperature on the Disengaging Dynamic Characteristics of a Cu-Based Wet Multi-Disc Clutch

Zheng

Chen

et al. 2021

Applied Sciences

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Clutch disengaging dynamic characteristics, including the disengaging duration and the variations of friction pair gaps and friction torque, are crucial to the shifting control of an automatic transmission. In the present paper, the influence of lubrication oil (ATF) temperature on disengaging dynamic characteristics is investigated through a comprehensive numerical model for the clutch disengaging process, which considers the hydrodynamic lubrication, the asperity contact, the heat transfer, the spline resistance, and the impact between the piston and clutch hub. Moreover, the non-uniformity coefficient (NUC) is proposed to characterize the disengaging uniformity of friction pairs. As the ATF temperature increases from 60 °C to 140 °C, the clutch disengaging duration shortens remarkably (shortened by 55.1%); besides, the NUC sees a decreasing trend before a slight increase. When the ATF temperature is 80 °C, the distribution of friction pair gaps is most uniform. During the disengaging process, the increase of ATF temperature not only accelerates the change of the lubrication status between friction pairs but also contributes to the decrease of contact torque and hydrodynamic torque. This research demonstrates for the first time, evidence for clutch disengaging dynamic characteristics with the consideration of ATF temperature.

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“…A spline friction force will generate during the axial movement of discs [30,31]. For the friction discs, the spline friction force is deduced as:…”

Section: Spline Resistance Modelmentioning

confidence: 99%

Influence of the Lubrication Oil Temperature on the Disengaging Dynamic Characteristics of a Cu-Based Wet Multi-Disc Clutch

Zheng

Chen

et al. 2021

Applied Sciences

Self Cite

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“…Zhang et al (2020) studied the mechanisms of bearing friction moments by using a calculation model of bearing friction moments. Chen et al (2021) established a friction moment numerical model to study the relationships between the friction element contact pressure and friction moment. Most of the above works can consider the internal contact loads; but they ignored the effects of the time-varying characteristics of contact loads on the friction moments.…”

Section: Introductionmentioning

confidence: 99%

“…(2020) studied the mechanisms of bearing friction moments by using a calculation model of bearing friction moments. Chen et al. (2021) established a friction moment numerical model to study the relationships between the friction element contact pressure and friction moment.…”

Section: Introductionmentioning

confidence: 99%

A dynamic model considering the time-varying friction moment of a flexible rotor system

Liu,

An,

Fancheng

et al. 2023

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PurposeBearing friction moments are important factors that affect the vibrations of rotor systems. The bearing friction moments are related to the dimension parameters, lubrication conditions and manufacturing errors of support bearings. This work studies the effects of the bearing friction moments on the vibrations of rotor systems.Design/methodology/approachThe rotor is separated into several shaft elements for formulating a flexible rotor. The time-varying friction moment (TFM) is affected by the time-varying contact loads. The vibrations of FRS from the TFM and Palmgren's friction moment (PFM) calculation methods are compared. Moreover, the effects of the rotor offset and radial clearance on the frequency-amplitude characteristics of FRS are studied.FindingsThe TFM method is more consistent with the actual operation mechanisms. The rotor offset and radial clearance can significantly affect the nonlinear vibrations of FRS. This work provides a new reference and research method for the vibration analysis of rotor systems considering the friction effects.Originality/valueThe elastohydrodynamic lubrication (EHL), elastic hysteresis and differential sliding are considered. A flexible rotor system (FRS) dynamic model considering the TFM is proposed. The vibrations of FRS from the TFM calculation method and empirical calculation formula are compared. The effects of the rotor offset and radial clearance on the frequency–amplitude characteristics of FRS are studied.

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Study on sliding friction torque and interfacial thermal behaviour of friction torque limiter

Wang,

Ning

et al. 2024

J Mech Sci Technol

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Numerical and Experimental Studies of the Attenuation Characteristics of Friction Torque in a Wet Multidisc Clutch

Cited by 4 publications

References 20 publications

Influence of the Lubrication Oil Temperature on the Disengaging Dynamic Characteristics of a Cu-Based Wet Multi-Disc Clutch

Influence of the Lubrication Oil Temperature on the Disengaging Dynamic Characteristics of a Cu-Based Wet Multi-Disc Clutch

A dynamic model considering the time-varying friction moment of a flexible rotor system

Study on sliding friction torque and interfacial thermal behaviour of friction torque limiter

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