Structural Design and Friction Performance Test of a New Conical Groove Friction Disks in Wet Clutch

Wang, Yanzhong; Yang, Kai; Wu, Xiangyu

doi:10.3390/app11167231

Cited by 4 publications

(2 citation statements)

References 24 publications

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“…Wang et al [6] compared the clutch engaging characteristics influenced by the groove shape and groove depth. Further, Wang et al [7] designed a new conical groove and researched its friction performance experimentally. The influence of radial and waffle grooves on the friction stability of a paper-based wet clutch was experimentally compared [8].…”

Section: Introductionmentioning

confidence: 99%

Study on the Temperature Rise Characteristics of Successive Clutch Shifting Considering the Disengaged Friction Pair Gaps

Zheng

Chen

et al. 2022

Machines

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The clutch temperature rise characteristics in successive shifting conditions are crucial to its thermal stability and thermal safety. In the present paper, a comprehensive numerical model is proposed to investigate the temperature change of separator discs during successive shifting with the consideration of convection heat transfer in disengaged friction pair gaps, which is validated by repeated shifting experiments on the SAE#2 test bench. Since the second separator disc near the piston has the widest disengaged gaps and double-sided heat input, its temperature rise and temperature drop are the highest. The temperature rise gradually equals the temperature drop with the increasing working cycle, then the maximum clutch temperature no longer increases. The longer the shifting interval, the better the heat dissipation is, thus the lower the accumulated temperature rise. Moreover, the increasing lubrication oil temperature reduces the convection heat transfer and increases the temperature rise in an engaging process, but the accumulated temperature rise does not increase due to the widened friction pair gaps. This paper can obtain the temperature rise characteristics of a wet multi-disc clutch concerning its disengaged gaps during successive shifting, which is a promising candidate for investigating its overall performance.

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Section: Introductionmentioning

confidence: 99%

Study on the Temperature Rise Characteristics of Successive Clutch Shifting Considering the Disengaged Friction Pair Gaps

Zheng

Chen

et al. 2022

Machines

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“…Wu et al [6,7] experimentally investigated the influences of ATF temperature and friction surface temperature on the friction coefficient. The influence of different groove shapes and depths on the friction torque was studied mathematically and experimentally by Wang et al [8,9]. Yu et al [10] experimentally compared the friction stability of a paper-based wet clutch with radial and waffle grooves.…”

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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Transient temperature characteristics of friction clutch disc considering thermal contact conductance under sliding conditions

Liu

Sun²,

Gao³

et al. 2023

Friction

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High temperatures are generated due to the sliding contacts between the rubbing surfaces of the friction clutch system. In this work, by considering the effective thermal contact conductance under sliding conditions, a simulation model of a two-dimensional transient temperature field of the clutch disc was developed. A numerical solution to obtain the surface temperature at different radii was presented based on the finite difference method. Compared with the experimental data, the proposed model for estimating the surface temperature is more accurate than the conventional prediction method. The results showed that the errors of the calculated temperatures at radii of 114 and 106 mm have obviously reduced by 12.98% and 12.60%, respectively. In addition, the influences of pressure and relative speed on the surface temperature were investigated. The temperature increases with the increase of the relative speed and pressure during the sliding period, and there is an interaction effect between pressure and speed on the surface temperature rise.

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Structural Design and Friction Performance Test of a New Conical Groove Friction Disks in Wet Clutch

Cited by 4 publications

References 24 publications

Study on the Temperature Rise Characteristics of Successive Clutch Shifting Considering the Disengaged Friction Pair Gaps

Study on the Temperature Rise Characteristics of Successive Clutch Shifting Considering the Disengaged Friction Pair Gaps

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

Transient temperature characteristics of friction clutch disc considering thermal contact conductance under sliding conditions

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