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TECHNICAL PAPERS

A Comprehensive Study of Self-Induced Torque Amplification in Rotary Viscous Couplings

[+] Author and Article Information
Sankar K. Mohan

Advanced Engineering, New Venture Gear Inc., 6600 NVG Drive, East Syracuse, NY 13057

Bandaru V. Ramarao

State University of New York, Environmental Science and Forestry, 1 Forestry Drive, Syracuse, NY 13210

J. Tribol 125(1), 110-120 (Dec 31, 2002) (11 pages) doi:10.1115/1.1504087 History: Received February 21, 2002; Revised June 13, 2002; Online December 31, 2002
Copyright © 2003 by ASME
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References

Peschke, W., 1986, “A Viscous Coupling in the Drive Train of an All-Wheel-Drive Vehicle,” SAE Technical Paper Series 860386.
Taureg, I. H., and Horst, J., 1990, “Induced Toque Amplification in Viscous Couplings,” SAE Technical Paper Series 900557.
Takemura, T., and Niikura, Y., 1990, “An Analysis of Viscous Coupling Torque Transmission Characteristics and Hump Phenomenon,” SAE Technical Paper Series 900558.
Nakaoka,  M., Kikuyama,  K., Hasegawa,  Y., and Kojima,  K., 1993, “Torque Amplification Phenomenon in Viscous Couplings (Effects of Camber of Inner Disk Blade),” Trans. Jpn. Soc. Mech. Eng., Ser. B, 59(561), pp. 44–51 (in Japanese).
Wakamatsu, M., Yoshida, K., Kojima, Y., Murata, O., and Mori, H., 1992, “Flow Analysis of Viscous Coupling,” ImechE, FISITA Technical Papers 925056, C389/221 , pp. 135–142.
Heuser, G., 1997, “An Approximate Solution for the Flow in Viscous Couplings,” Forsch Ingenieurwes, 63 , Springer-Verlag, pp. 206–214.
Mohan, S. K., Ramarao, B. V., Stephens, C. F., Varma, S. K., and Gokul, B. V., 1992, “Viscous Couplings in 4WD Vehicles: Application of Computational Modeling,” SAE Technical Paper Series 920611.
Young, W. C., and Budynas, R. G., 2002, Roark’s Formulas for Stress and Strain, Seventh Edition, McGraw-Hill Book Company, New York, p. 401.
Schlichting, H., 1979, Boundary-Layer Theory, McGraw-Hill Book Company, Seventh Edition, New York, pp. 116–122.
Lin,  J-R., 2001, “Non-Newtonian Effects on the Dynamic Characteristics of One-Dimensional Slider Bearings: Rabinowitsch Fluid Model,” Tribol. Lett., 10(4), pp. 237–243.
Kingsbury,  A., 1931, “On Problems in the Theory of Fluid-Film Lubrication, With an Experimental Method of Solution,” Trans. ASME, 53, pp. 59–75.
Needs,  S. J., 1934, “Effects of Side Leakage in 120 Degree Centrally Supported Journal Bearings,” Trans. ASME, 56, pp. 721–732; 57, 1935, pp. 135–138.
Fuller, D. D., 1984, Theory and Practice of Lubrication for Engineers, Second Edition, John Wiley & Sons, New York, p. 230.
Pan, C., 1998, “Numerical Analysis of Humping in Viscous Couplings,” Ph.D. thesis, Syracuse University, Syracuse, NY.
Greenwood,  J. A., and Williamson,  J. B. P., 1966, “Contact of Nominally Flat Surfaces,” Proc. R. Soc. London, Ser. A, 295, pp. 300–319.
Patir,  N., and Cheng,  H. S., 1979, “Application of Average Flow Model to Lubrication Between Rough Sliding Surfaces,” ASME J. Tribol., 101, pp. 220–230.
Megat Ahmad,  M. M. H., Gethin,  D. T., Claypole,  T. C., and Roylance,  B. J., 1998, “Numerical and Experimental Investigation Into Porous Squeeze Films,” Tribol. Int., 31(4), pp. 189–199.
Mohan, S. K., 2002, “A Comprehensive Study of Self-Induced Torque Amplification in Rotary Viscous Couplings,” Ph.D. thesis, Syracuse University, Syracuse, NY.

Figures

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Viscous coupling—general details
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Torque, temperature, and pressure traces
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Self-induced torque amplification in flow cells (STA sequence)
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Viscosity as a function of shear rate
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Calculated and experimental results for shear torque
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Calculated shear torque as a function of inner plate axial position
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Simplified geometry of the plate tab
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Calculated tab deflection and axial force
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Deflected geometry of inner plate tab
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Separation of air at the low pressure side of the tabs
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Plate cell geometry and leakage flow
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Experimental and calculated results of pressure rise
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Experimental and simulation results for torque during STA process
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Schematic experimental setup

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