The paper presents results obtained using a transient analysis technique for point contact elastohydrodynamic lubrication (EHL) problems based on a formulation that couples the elastic and hydrodynamic equations. Results are presented for transverse ground surfaces in elliptical point contact that show severe film thinning and asperity contact at the transverse limits of the contact area. This thinning is caused by transverse leakage of the lubricant from the contact in the remaining deep valley features between the surfaces. A comparison is also made between the point contact results on the entrainment center line and the equivalent line contact analysis. The extent of asperity contact is shown to be dependent on the Hertzian contact aspect ratio. It is also shown that transverse waviness (superimposed on the roughness) of even relatively small amplitude can lead to large increases in asperity contact rates over all waviness peaks in the contact.

Issue Section:
Technical Papers
Keywords:
rough surfaces, lubrication, gears, transient analysis
Topics:
Film thickness, Lubrication, Pressure, Surface roughness, Transient analysis, Gear teeth, Gears, Leakage, Lubricants
1.
Dowson, D., and Higginson, G. R., Elastohydrodynamic Lubrication, Pergamon, Oxford, 1966.
2.
Holmes
,
M. J. A.
,
Hughes
,
T. G.
,
Evans
,
H. P.
, and
Snidle
,
R. W.
,
2003
, “
Transient Elastohydrodynamic Point Contact Analysis Using a New Coupled Differential Deflection Method: Part 1 Formulation and Validation
,”
Proc. Inst. Mech. Eng., Part J: J. Eng. Tribol.
,
217
, pp.
289
–
303
.
3.
Holmes
,
M. J. A.
,
Hughes
,
T. G.
,
Evans
,
H. P.
, and
Snidle
,
R. W.
,
2003
, “
Transient Elastohydrodynamic Point Contact Analysis Using a New Coupled Differential Deflection Method: Part 2 Results
,”
Proc. Inst. Mech. Eng., Part J: J. Eng. Tribol.
,
217
, pp.
305
–
321
.
4.
Evans
,
H. P.
, and
Snidle
,
R. W.
,
1996
, “
A Model For Elasto-Hydrodynamic Film Failure in Contacts Between Surfaces Having Transverse Finish
,”
Trans. ASME, J. Tribol.
,
118
, pp.
847
–
857
.
5.
Patching
,
M. J.
,
Kweh
,
C. C.
,
Evans
,
H. P.
, and
Snidle
,
R. W.
,
1995
, “
Conditions For Scuffing Failure of Ground and Super-Finished Steel Disks at High Sliding Speeds Using a Gas Turbine Engine Oil
,”
Trans. ASME, J. Tribol.
,
117
, pp.
482
–
489
.
6.
Sharif
,
K. J.
,
Kong
,
S.
,
Evans
,
H. P.
, and
Snidle
,
R. W.
,
2001
, “
Contact and Elastohydrodynamic Analysis of Worm Gears: Part 1 Theoretical Formulation
,”
Proc. Inst. Mech. Eng., Part C: J. Mech. Eng. Sci.
,
215
, pp.
817
–
830
.
7.
Evans
,
H. P.
, and
Hughes
,
T. G.
,
2000
, “
Evaluation of Deflection in Semi-Infinite Bodies by a Differential Method
,”
Proc. Inst. Mech. Eng., Part C: J. Mech. Eng. Sci.
,
214
, pp.
563
–
584
.
8.
Holmes, M. J. A., Transient Analysis of the Point Contact Elastohydrodynamic Lubrication Problem Using Coupled Solution Methods, Ph.D. thesis, Cardiff University.
9.
Holmes, M. J. A., Evans, H. P., and Snidle, R. W., 2003, “Comparison of Transient EHL Calculations With Start-Up Experiments,” Proc. 29th Leeds–Lyon Tribology Symposium, Elsevier, pp. 79–89.
10.
Glovnea
,
R. P.
, and
Spikes
,
H. A.
,
2001
, “
Elastohydro-Dynamic Film Formation at the Start Up of the Motion
,”
Proc. Inst. Mech. Eng., Part J: J. Eng. Tribol.
,
215
, pp.
125
–
138
.
11.
Tao, J., Hughes, T. G., Evans, H. P., and Snidle, R. W., 2002, “Elastohydrodynamic Response of Transverse Ground Gear Teeth,” Proc. 28th Leeds–Lyon Symp. on Tribology, Elsevier, Amsterdam.
12.
Elcoate
,
C. D.
,
Hughes
,
T. G.
,
Evans
,
H. P.
, and
Snidle
,
R. W.
,
2001
, “
Transient Elastohydrodynamic Analysis Using a Novel Coupled Differential Deflection Method
,”
Proc. Inst. Mech. Eng., Part J: J. Eng. Tribol.
,
215
, pp.
319
–
337
.
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