Elastohydrodynamic lubrication (EHL) film thickness and rolling resistance play a critical role in determining friction, wear, life, and other tribological characteristics of rolling bearings. Although film thickness formulas are widely used and experimentally verified, accurate prediction of the film thickness is still difficult under starved conditions. This paper presents a numerical study of starved EHL point contacts using a nonuniform inlet film thickness obtained from a modified Coyne–Elrod boundary condition. An experimental verification of the numerical results is also presented. Based on the results of a parametric study, inlet distance formulas are obtained as a function of the initial film thickness, the fully flooded central film thickness, and the capillary number. By using the inlet distance formulas and the Hamrock–Dowson formulas, the central film thickness, the minimum film thickness, and the viscous rolling resistance can be calculated.
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October 2015
Research-Article
Film Thickness and Rolling Resistance in Starved Elastohydrodynamic Lubrication of Point Contacts With Reflow
Takashi Nogi
7-44-1 Jindaiji-higashimachi,
e-mail: nogi.takashi@jaxa.jp
Takashi Nogi
Japan Aerospace Exploration Agency
,7-44-1 Jindaiji-higashimachi,
Chofu, Tokyo 182-8522
, Japan
e-mail: nogi.takashi@jaxa.jp
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Takashi Nogi
Japan Aerospace Exploration Agency
,7-44-1 Jindaiji-higashimachi,
Chofu, Tokyo 182-8522
, Japan
e-mail: nogi.takashi@jaxa.jp
Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received December 29, 2014; final manuscript received March 12, 2015; published online April 29, 2015. Assoc. Editor: Xiaolan Ai.
J. Tribol. Oct 2015, 137(4): 041502 (8 pages)
Published Online: October 1, 2015
Article history
Received:
December 29, 2014
Revision Received:
March 12, 2015
Online:
April 29, 2015
Citation
Nogi, T. (October 1, 2015). "Film Thickness and Rolling Resistance in Starved Elastohydrodynamic Lubrication of Point Contacts With Reflow." ASME. J. Tribol. October 2015; 137(4): 041502. https://doi.org/10.1115/1.4030203
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