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Research Article | Open Access

An improved method for evaluating the rotational speed stability of a hydro-viscous clutch in mixed lubrication

Shou-Wen YAO1,2, Qian LIU1( ), Hong-Wei CUI3, Shan-Shan FENG1
School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
National Key Laboratory of Vehicular Transmission, Beijing Institute of Technology, Beijing 100081, China
School of Mechanical Engineering, Taiyuan University of Technology, Taiyuan 030024, China
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Abstract

Rotational speed stability is an important evaluation indicator of the performance of a hydro-viscous clutch (HVC). To improve the rotational speed stability of HVCs in mixed lubrication and the running condition of the friction pairs, the speed stability of an HVC in mixed lubrication was studied. To this end, the friction coefficients of both copper-based and paper-based friction pairs were experimentally tested using an MM1000-III wet friction machine. Theoretically, a torsional vibration model of the system is presented. The phase plane analysis method is applied to evaluate the stability of the torsional vibration model, where a critical negative gradient (CNG) is defined. The results show that the friction coefficient in mixed lubrication is an important parameter for the stability of the rotational speed. The system will be unstable when the negative gradient of the friction coefficient-slip speed is larger than the CNG. According to the definition of the CNG, suggestions regarding choice of friction pairs are made to improve the rotational speed stability of an HVC in mixed lubrication.

Keywords

hydro-viscous clutch; mixed lubrication; speed stability; negative gradient of friction coefficient-slipping speed; torsional vibration model; critical negative gradient

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Friction
Volume 3 Issue 1,
March 2015
Pages 47-55
DOI: 10.1007/s40544-014-0071-1

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Cite this article:
YAO S-W, LIU Q, CUI H-W, et al. An improved method for evaluating the rotational speed stability of a hydro-viscous clutch in mixed lubrication. Friction, 2015, 3(1): 47-55. https://doi.org/10.1007/s40544-014-0071-1

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Received: 19 May 2014
Revised: 12 July 2014
Accepted: 02 December 2014
Published: 05 January 2015
© The author(s) 2014

This article is published with open access at Springerlink.com

Open Access: This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.