The effect of single-sided and double-sided harmonic surface waviness on the film thickness, pressure, and temperature oscillations in an elastohydrodynamically lubricated eccentric-tappet pair has been investigated in relation to the eccentricity and the waviness wavelength. The results show that, during one working cycle, the waviness causes significant fluctuations of the oil film, pressure, and temperature, as well as a reduction in minimum film thickness. Smaller wavelength causes more dramatic variations in oil film. The fluctuations of the pressure, film thickness, temperature, and traction coefficient caused by double-sided waviness are nearly the same compared with the single-sided waviness, but the variations are less intense.
Issue Section:
Research Papers
References
1.
Ai
, X.
, and Yu
, H.
, 1989
, “A Numerical Analysis for the Transient EHL Process of a Cam-Tappet Pair in I.C. Engine
,” ASME J. Tribol.
, 111
, pp. 413
–417
.10.1115/1.32619402.
Taylor
, C. M.
, 1998
, “Automobile Engine Tribology—Design Considerations for Efficiency and Durability
,” Wear
, 221
, pp. 1
–8
.10.1016/S0043-1648(98)00253-13.
Messé
, S.
, and Lubrecht
, A. A.
, 2000
, “Transient Elastohydrodynamic Analysis of an Overhead Cam/Tappet Contact
,” Proc. Inst. Mech. Eng., Part J: J. Eng. Tribol.
, 214
, pp. 415
–425
.10.1243/13506500015432964.
Gangopadhyay
, A.
, and McWatt
, D. G.
, 2008
, “The Effect of Novel Surface Textures on Tappet Shims on Valvetrain Friction and Wear
,” Tribol. Trans.
, 51
(2
), pp. 221
–230
.10.1080/104020008019180565.
Michalski
, J.
, Marszalek
, J.
, and Kubiak
, K.
, 2000
, “An Experimental Study of Diesel Engine Cam and Follower Wear With Particular Reference to the Properties of the Materials
,” Wear
, 240
, pp. 168
–179
.10.1016/S0043-1648(00)00353-76.
Wang
, J.
, and Yang
, P.
, 2003
, “A Numerical Analysis for TEHL of Eccentric-Tappet Pair Subjected to Transient Load
,” ASME J. Tribol.
, 125
, pp. 770
–779
.10.1115/1.15764257.
Vela
, D.
, Fazzolari
, F.
, and Ciulli
, E.
, 2011
, “Dynamic Aspects of a New Experimental Apparatus for Tribological Investigations on Cam-Follower Pairs
,” 13th World Congress in Mechanism and Machine Science
, Guanajuato, Mexico
, 19–25 June
, Paper No. A19-504.8.
Vela
, D.
, Cuilli
, E.
, Piccigallo
, B.
, and Fazzolari
, F.
, 2011
, “Investigation on Cam-Follower Lubricated Contacts
,” Proc. Inst. Mech. Eng., Part J: J. Eng. Tribol.
, 225
, pp. 379
–392
.10.1177/13506501114001579.
Jang
, S.
, 2008
, “Transient Elastohydrodynamic Lubrication Film Thickness in Sliding and Rolling Line Contacts
,” J. Mech. Sci. Technol.
, 22
, pp. 946
–956
.10.1007/s12206-008-0124-310.
Yang
, P.
, and Wen
, S.
, 1990
, “A Generalized Reynolds Equation for Non-Newtonian Thermal Elastohydrodynamic Lubrication
,” ASME J. Tribol.
, 112
, pp. 631
–636
.10.1115/1.292030811.
Zhu
, D.
, and Wen
, S.
, 1984
, “A Full Numerical Solution for the Thermoelastohydrodynamic Problem in Elliptical Contact
,” ASME J. Tribol.
, 106
, pp. 246
–254
.10.1115/1.326089512.
Roelands
, C. J. A.
, 1966
, “Correlation Aspects of Viscosity-Temperature-Pressure Relationship of Lubricating Oils
,” Ph.D. thesis, Delft University of Technology
, The Netherlands
.13.
Venner
, C. H.
, and Lubrecht
, A. A.
, 2000
, Multilevel Methods in Lubrication
, Elsevier
, New York
.14.
Yang
, P.
, Qu
, S.
, Chang
, Q.
, and Guo
, F.
, 2001
, “On the Theory of Thermal Elastohydrodynamic Lubrication at High Slide-Roll Ratios: Line Contact Solution
,” ASME J. Tribol.
, 123
, pp. 36
–41
.10.1115/1.133073815.
Wang
, J.
, Kaneta
, M.
, Guo
, F.
, and Yang
, P.
, 2006
, “Occurrence of Micro-EHL in Simple Sliding Motion With Transverse Roughness
,” Proc. Inst. Mech. Eng., Part J: J. Eng. Tribol.
, 220
, pp. 273
–285
.10.1243/13506501JET14216.
Hooke
, C. J.
, and Venner
, C. H.
, 2000
, “Surface Roughness Attenuation in Line and Point Contacts
,” Proc. Inst. Mech. Eng., Part J: J. Eng. Tribol.
, 214
, pp. 439
–444
.10.1243/135065000154331317.
Wang
, J.
, Venner
, C. H.
, and Lubrecht
, A. A.
, 2011
, “Amplitude Reduction in EHL Line Contacts Under Rolling Sliding Conditions
,” Tribol. Int.
, 44
(12
), pp. 1997
–2001
.10.1016/j.triboint.2011.08.00918.
Sperka
, P.
, Krupka
, I.
, and Hartl
, M.
, 2010
, “Experimental Study of Real Roughness Attenuation in Concentrated Contacts
,” Tribol. Int.
, 43
, pp. 1893
–1901
.10.1016/j.triboint.2009.11.003Copyright © 2013 by ASME
You do not currently have access to this content.
