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Influence of Groove Type on Friction Coefficient of Wet Friction Clutch Pair

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Abstract

The shape of the groove in the friction plate of a wet friction clutch has an influence on the dynamic friction coefficient of the friction pair. Some suggestions are put forward for the selection of the groove type of brake pads. This study establishes a dynamic friction coefficient calculation model for clutch engagement process considering the asperity and lubricant bearing capacities of the centrifugal force of the oil film. The model is based on the Reynolds equation, average flow model, and Greenwood model. The friction coefficients of different groove shapes were measured using the SAE#2 testing machine. The measured results were compared with theoretical calculations to verify the accuracy of the theoretical model. Under the premise of satisfying the torque transmission condition of the helicopter, the groove type of the wet clutch friction plate should be waffling groove or double arc groove. In this study, some suggestions are put forward for the selection of the groove type of the friction plate of the wet clutch.

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Abbreviations

\({p}_{{\text{v}}}\) :

Average oil-film bearing capacity

A 0 :

Geometric contact area

A a :

Direct contact area

A b :

Boundary-film contact area

A n :

Area of the friction disk

C :

Relative oil-film loss

E' :

Equivalent elastic modulus

E 1 :

Elastic moduli of the friction disks

E 2 :

Elastic moduli of the separator disks

f :

Rough friction force

F :

Common bearing capacity

f c :

Contact friction force of the asperity

F c :

Bearing capacity of the asperity

f v :

Friction force of the lubricating-oil film

F v :

Bearing capacity of the oil film

h :

Initial distance

\(\overline{h}_{t}\) :

Average oil-film thickness

P:

Oil-film pressure

R :

Curvature radius of the asperity

\(H\) :

Film thickness ratio

γ :

Fluid film shear strain rate

γ L :

Pressure coefficient of the fluid film

η :

Lubricating-oil viscosity coefficient

λ :

Density of the asperities

σ :

Roughness of the joint rough surface

σ 1 :

Rough peaks of the surfaces of friction disk

σ 2 :

Rough peaks of the surfaces of separator disk

τ c :

Boundary-film shear stress

τ l :

Fluid film shear stress

τ L :

Ultimate shear stress of the fluid film

τ L 0 :

Initial limit shear stress of the fluid film

φ r :

Pressure-flow factor

ω 1 :

Friction-disk angular velocity

ω 2 :

Separator disk angular velocity

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Acknowledgements

This paper thanks Professor Heyun Bao, Professor Rupeng Zhu, Chao Zhang, and Engineer Wuzhong Tan for their guidance on the writing process of this paper. This study was supported by the National Natural Science Foundation of China (51975274) and National Key Laboratory of Science and Technology on Helicopter Transmission (Grant No. HTL-A-21G05).

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Authors and Affiliations

  1. National Key Laboratory of Science and Technology on Helicopter Transmission, Nanjing University of Aeronautics and Astronautics, Nanjing, China

    Xingguang Yang, Heyun Bao, Chao Zhang & Rupeng Zhu

  2. National Key Laboratory of Science and Technology on Helicopter Transmission, AECC Hunan Aviation Powerplant Research Institute, Zhuzhou, China

    Wuzhong Tan

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  1. Xingguang Yang
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  2. Heyun Bao
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  3. Chao Zhang
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  4. Wuzhong Tan
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  5. Rupeng Zhu
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Correspondence to Heyun Bao.

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Yang, X., Bao, H., Zhang, C. et al. Influence of Groove Type on Friction Coefficient of Wet Friction Clutch Pair. Int.J Automot. Technol. 25, 119–129 (2024). https://doi.org/10.1007/s12239-024-00018-6

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  • DOI: https://doi.org/10.1007/s12239-024-00018-6

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