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.
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Shou-Wen YAO. He received his Ph.D degree from China Academy of Railway Sciences, China, in 2000. He is currently an associate professor in School of Mechanical Engineering at Beijing Institute of Technology, China. His research interests include the technology of vehicular transmission, viscous drive, etc.
Qian LIU. She received her Bachelor degree in School of Mechanical Engineering and Automation in 2012 from Northeastern University, China. She is currently a graduate student in School of Mechanical Engineering at Beijing Institute of Technology. Her research interests include the technology of vehicular transmission and viscous drive.
Hong-Wei CUI. He received his bachelor degree in School of Mechanical Engineering at Beijing Institute of Technology, China, in 2008. And then, he received his Ph.D degree at the same university. He is currently a teacher in School of Mechanical Engineering at Taiyuan University of Technology. His research interests include the technology of vehicular transmission and viscous drive.
Shan-Shan FENG. She received her Bachelor degree in School of Transportation in 2011 from Ludong University, China. She is currently a graduate student in School of Mechanical Engineering at Beijing Institute of Technology. Her research interests include the technology of vehicular transmission and viscous drive.
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Yao, SW., Liu, Q., Cui, HW. et al. An improved method for evaluating the rotational speed stability of a hydro-viscous clutch in mixed lubrication. Friction 3, 47–55 (2015). https://doi.org/10.1007/s40544-014-0071-1
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DOI: https://doi.org/10.1007/s40544-014-0071-1