Influences of Deformed Film Gaps on Dynamic Torque Behavior of Hydroviscous Drive

Chen, Jianzhong; Xie, Fangwei; Li, Hu; Zhao, Xueya

doi:10.1080/10402004.2020.1856991

Cited by 4 publications

(1 citation statement)

References 31 publications

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“…Moreover, the distribution of axial hydrodynamic pressure was measured and validated via the CFD model [21]. Cui et al [22,23] studied the axial hydrodynamic force and drag torque of friction pairs with a conical deformation disc. Wang et al [24] proposed a statistical method to describe the distribution of disengaged friction pair gaps, finding that the more uneven the gap distribution is, the larger the drag torque is.…”

Section: Introductionmentioning

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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Section: Introductionmentioning

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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Numerical studies on the dynamic characteristics of a wet multi-disc clutch during the disengaging process

Zheng

Chen

et al. 2022

J Mech Sci Technol

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A review on flow instability in hydro-viscous drive

Cui,

Tang

2024

Physics of Fluids

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Hydro-viscous drive (HVD) plays a significant role in smoothly transferring torque and flexibly regulating the velocity of the disks. By hydro-viscous drive, we mean that the viscous shear stress of the thin oil film between a multi-layer assembly of rotating parallel disks is generated to transmit torque and power. The laminar-to-turbulent transition is an extremely complicated issue due to the combined effects of squeeze and shear on the oil film within the microscale friction pair system. Hence, a comprehensive and thorough analysis of flow instability in fluid-thermal-solid interaction of tribodynamic behavior is highly desirable. Following a brief introduction of fundamentals of HVD, this paper provides an overall review on the instability mechanisms for three types of canonical flow dynamic models, i.e., plane squeeze flow, plane shear flow, and rotating-disk flow. The effects of various aspects of wall conditions and working media, such as surface microstructure, and temperature-dependent viscosity, on flow instability are then summarized, which can serve as a reference and guidance for optimizing the design of friction pair systems. Based on the review of the former progress, this paper not only explores the in-depth mechanisms regarding the laminar-to-turbulent transition in microchannel flow, but also provides the possibility of bridging the gap between flow instability and tribodynamic behavior.

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Influences of Deformed Film Gaps on Dynamic Torque Behavior of Hydroviscous Drive

Cited by 4 publications

References 31 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

Numerical studies on the dynamic characteristics of a wet multi-disc clutch during the disengaging process

A review on flow instability in hydro-viscous drive

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