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TECHNICAL PAPERS

Elastohydrodynamics of a Worm Gear Contact

[+] Author and Article Information
S. Kong, K. Sharif, H. P. Evans, R. W. Snidle

School of Engineering, Cardiff University, CF2 3TA, United Kingdome-mail: snidler@cf.ac.uk

J. Tribol 123(2), 268-275 (Jun 16, 2000) (8 pages) doi:10.1115/1.1308003 History: Received February 08, 2000; Revised June 16, 2000
Copyright © 2001 by ASME
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References

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Seol,  I. H., and Litvin,  F. L., 1996, “Computerised Design, Generation and Simulation of Meshing and Contact of Modified Involute, Klingelnberg and Flender Type Worm-Gear Drives,” Trans. ASME, J. Mech. Design, 118, pp. 551–555.
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Hu, J., 1997, “The Kinematic Analysis and Metrology of Cylindrical Worm Gearing,” PhD thesis, University of Newcastle upon Tyne, England.
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Bathgate,  J., and Yates,  F., 1970, “The Application of Film Thickness, Flash Temperature and Surface Fatigue Criteria to Worm Gears,” ASLE Trans., 13, pp. 21–28.
Fuan,  C., Chen,  Z., Yeuhai,  S., and Jing,  S., 1998, “Lubrication Basis Theory of Worm Pair and Temperature Distribution on Worm Gear Surface,” Chin. J. Mech. Eng., 11, pp. 19–22.
Simon, V., 1985, “Thermoelastohydrodynamic Analysis of Lubrication of Worm Gears,” Proc. JSLE International Tribology Conference, JSLE, Tokyo, Japan, pp. 1147–1152.
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Snidle,  R. W., and Evans,  H. P., 1994, “A Simple Method of Elastic Contact Simulation,” Proc. Inst. Mech. Eng., Part J., 208, pp. 291–293.
Johnson,  K. L., and Tevaarwerk,  J. L., 1977, “The Shear Behavior of Elastohydrodynamic Oil Films,” Proc. R. Soc. London, Ser. A, 356, pp. 215–236.
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Sharif, K. A. H., Kong, S., Evans, H. P., and Snidle, R. W., 2000, “Non-Newtonian Thermal Elastohydrodynamic Analysis of Worm Gear Contacts: Part 1 Theoretical Formulation; Part 2 Results,” Proc. Inst. Mech. Eng., Part C: Mech. Eng. Sci. (submitted).
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Figures

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Wheel tooth showing contours of undeformed gap/μm between worm and wheel teeth (a) conjugate case; (b) hob oversize case
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Dry contact areas at different points within the meshing cycle
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Pressure distribution for dry contact midway through the meshing cycle
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Results of EHL analysis for case 1 at first 14 point of the meshing cycle: (a) pressure surface; (b) film thickness contours/μm (inlet is on the left)
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Temperature contours/°C from EHL solution for case 1: (a) mid-film oil temperature; (b) worm surface temperature; (c) wheel surface temperature
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Results of EHL analysis for case 2 at second 1/4 point of the meshing cycle: (a) pressure surface; (b) film thickness contours/μm (inlet is on the left)
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Temperature contours/°C from EHL solution for case 2: (a) mid-film oil temperature; (b) worm surface temperature; (c) wheel surface temperature
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Results of EHL analysis for case 3 at third 1/4 point of the meshing cycle: (a) pressure surface; (b) film thickness contours/μm (inlet is on the left)
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Temperature contours/°C from EHL solution for case 3: (a) mid-film oil temperature; (b) worm surface temperature; (c) wheel surface temperature
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Area of dry elastic contact for case 2 showing entrainment velocity vectors
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Line of predicted poor film generation for cases 1, 2, and 3

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