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Friction Characteristics of an Hydraulic Cylinder for an Automotive Manual Clutch  

Lee, Byoung-Soo (School of Mechanical and Automotive Engineering, Keimyung University)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.14, no.4, 2006 , pp. 32-38 More about this Journal
Abstract
A clutch hydraulic system for automotive manual transmissions transfers hydraulic pressure generated by driver's pedal manipulation to the clutch mechanism. The foot effort when the clutch pedal is pushed is different than that when the clutch is returned. The effort or load difference, called hysteresis, is caused by the friction produced between rubber seal and inner wall inside the hydraulic cylinder. This clutch pedal travel foot effort hysteresis is essential for a clutch hydraulic system design and analysis. The dynamic model for a clutch hydraulic system is developed and a simulation analysis is performed to estimate the fiction coefficient as a function of the cylinder pressure. The simulation result is then compared to the measurements obtained from a clutch hydraulic system tester to ensure the reliability of the dynamic model and the coefficients estimated. Also the estimated friction coefficients at various pressure values are compared to those reported by an independent study.
Keywords
Automotive clutch; Master cylinder; Release cylinder; Rubber cup-seal; Friction; Foot effort; Hysteresis; Deflection-load curve;
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  • Reference
1 J. U. Choi, I. K. Cheon, H. J. Kim and C. K. Kim, 'Finite Element Analysis of the Sealing Mechanism for an U-Cup Seal,' J. KSTLE, Vol.10, No.3, pp.12-17, 1997
2 Haessig, D. A. Jr., 'On the Modeling and Simulation of Friction,' Transaction of the ASME, Vol.113, pp.354-362, 1991
3 S. W. Han, W. D. Kim and H. J. Lee, 'Numerical Analysis of Water Seal Characteristics,' Annual Research Report, KIMM, Vol.24, pp.175-188, 1994
4 C. K. Kim and I. K. Cheon, 'On The Analysis of Rubber Oil Seal in Consideration of Heat Stress,' J. KSTLE, Vol.10, No.2, pp.39-42, 1994
5 J.-C. Lee, M.-H. Im, B. Lee, et. aI., 'An Experimental Study on The Friction Coefficient of Rubber for Clutch Master Cylinder Cup-Seal,' Transactions of KSAE, Vol.11, No.11, pp.112-118, 2003
6 B. S. Yang, 'Sealing Performance of Oil Seal,' J. KSTLE, Vol.3, No.1, pp.12-17, 1987
7 M.-H. Im, J.-C. Lee and B.-E. Gu, 'Finite Element Analysis of Primary Cup-Seal in a Clutch Master Cylinder,' Transactions of KSAE, Vol.10, No.3, pp.143-150, 2002
8 T. Raparelli, A. M. Bertetto and L. Mazza, 'Experimental and Numerical Study of Friction in an Elastomeric Seal for Pneumatic Cylinders,' Triboloty International, Vol.30, No.7, pp.547-552, 1997   DOI   ScienceOn