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

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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“…During the clutch working process, a spline friction force will generate and attenuate the applied pressure [22,23], which is given as:…”

Section: Spline Resistance Modelmentioning

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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“…Another parameter that influences the drag torque of the disengaged clutches is the oil viscosity. Zheng et al [12] investigated the influence of lubrication oil (ATF) temperature on disengaging dynamic characteristics through a comprehensive numerical model for the clutch disengaging process. The results presented in the conclusion indicate that the increase in oil temperature not only accelerates the change of the lubrication status between the discs but also leads to the decrease in friction torque and hydrodynamic torque.…”

Section: Introductionmentioning

confidence: 99%

“…• the temperature of oil from 25 deg C to 80 deg C based on the theoretical analysis of Zheng et al [12].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Drag Torque between Wet Clutch Discs

et al. 2022

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The development of automatic gearbox control systems contributes to their increasing popularity. By raising the number of gears and sophisticated algorithms, the reduction of fuel consumption is feasible regarding traditional manual transmissions. The continuously variable transmissions (CVT) are also growing their share of the market. Wet clutches are employed in all types of automatic transmissions, but because of oil viscosity, when such a type of clutch is disengaged, the drag torque phenomenon occurs. This deteriorates the global efficiency of the transmission system. To recognize the nature of this drag torque and how it is influenced by the main parameters (distance between plates, value of oil flow rate lubricating clutch, oil temperature, rotational speed between plates), a new test stand has been designed and assembled. The value of rotational speed has been studied up to 7000 rpm which is novel in literature. Due to strongly nonlinear dependences, the achieved results can contribute to designing more efficient clutch systems due to the strongly nonlinear nature of observed phenomena.

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Model Validation of Rigid Body Tilting of Deformed Spinning Discs with Spline-Guided Constraints

Jishan

Chen

et al. 2023

Exp Tech

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

Cited by 8 publications

References 32 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

Experimental Study of Drag Torque between Wet Clutch Discs

Model Validation of Rigid Body Tilting of Deformed Spinning Discs with Spline-Guided Constraints

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