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

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• 作者：Shou-Wen Yao (1) (2)
  Qian Liu (1)
  Hong-Wei Cui (3)
  Shan-Shan Feng (1)
  
  1. School of Mechanical Engineering ; Beijing Institute of Technology ; Beijing ; 100081 ; China
  2. National Key Laboratory of Vehicular Transmission ; Beijing Institute of Technology ; Beijing ; 100081 ; China
  3. School of Mechanical Engineering ; Taiyuan University of Technology ; Taiyuan ; 030024 ; China
  
• 关键词：Hydro ; viscous clutch ; mixed lubrication ; speed stability ; negative gradient of friction coefficient ; slipping speed ; torsional vibration model ; critical negative gradient
• 刊名：Friction
• 出版年：2015
• 出版时间：March 2015
• 年：2015
• 卷：3
• 期：1
• 页码：47-55
• 全文大小：1,418 KB
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• 刊物主题：Mechanical Engineering; Nanotechnology; Tribology, Corrosion and Coatings; Physical Chemistry; Surfaces and Interfaces, Thin Films;
• 出版者：Springer Berlin Heidelberg
• ISSN：2223-7704

文摘

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.