Under repeated overrollings, the elastohydrodynamic lubrication (EHL) film thickness can be much less than the fully flooded value due to the ejection of the lubricant from the track. The ejection of the lubricant is caused by the pressure flow in the inlet, and under conditions of negligible reflow, the reduction rate is predicted by the numerical analysis with a uniform inlet film thickness. However, the degree of starvation is determined by the balance of the ejection and reflow. In the previous papers for circular contacts, the reflow is taken into account using a nonuniform inlet film thickness obtained based on the Coyne–Elrod boundary condition. In this paper, the model for circular contacts is extended to elliptical contacts, which are of more practical importance in rolling bearings. The model is verified for the inlet distance and the film thickness using a roller on disk optical test device. Numerical results are fitted to an inlet distance formula, which is a function of the initial film thickness, the fully flooded central film thickness, the capillary number, and the ellipticity ratio. The inlet distance formula can be applied to the Hamrock–Dowson formulas for the starved film thickness.
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January 2018
Research-Article
Starved Elastohydrodynamic Lubrication With Reflow in Elliptical Contacts
Takashi Nogi,
Takashi Nogi
Japan Aerospace Exploration Agency,
7-44-1 Jindaiji-higashimachi,
Chofu, Tokyo 182-8522, Japan
e-mail: nogitak@gmail.com
7-44-1 Jindaiji-higashimachi,
Chofu, Tokyo 182-8522, Japan
e-mail: nogitak@gmail.com
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Hiroshi Shiomi,
Hiroshi Shiomi
Japan Aerospace Exploration Agency,
2-1-1 Sengen,
Tsukuba, Ibaraki 305-8505, Japan
e-mail: shiomi.hiroshi@jaxa.jp
2-1-1 Sengen,
Tsukuba, Ibaraki 305-8505, Japan
e-mail: shiomi.hiroshi@jaxa.jp
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Noriko Matsuoka
Noriko Matsuoka
Japan Aerospace Exploration Agency,
7-44-1 Jindaiji-higashimachi, Chofu,
Tokyo 182-8522, Japan
e-mail: matsuoka.noriko@jaxa.jp
7-44-1 Jindaiji-higashimachi, Chofu,
Tokyo 182-8522, Japan
e-mail: matsuoka.noriko@jaxa.jp
Search for other works by this author on:
Takashi Nogi
Japan Aerospace Exploration Agency,
7-44-1 Jindaiji-higashimachi,
Chofu, Tokyo 182-8522, Japan
e-mail: nogitak@gmail.com
7-44-1 Jindaiji-higashimachi,
Chofu, Tokyo 182-8522, Japan
e-mail: nogitak@gmail.com
Hiroshi Shiomi
Japan Aerospace Exploration Agency,
2-1-1 Sengen,
Tsukuba, Ibaraki 305-8505, Japan
e-mail: shiomi.hiroshi@jaxa.jp
2-1-1 Sengen,
Tsukuba, Ibaraki 305-8505, Japan
e-mail: shiomi.hiroshi@jaxa.jp
Noriko Matsuoka
Japan Aerospace Exploration Agency,
7-44-1 Jindaiji-higashimachi, Chofu,
Tokyo 182-8522, Japan
e-mail: matsuoka.noriko@jaxa.jp
7-44-1 Jindaiji-higashimachi, Chofu,
Tokyo 182-8522, Japan
e-mail: matsuoka.noriko@jaxa.jp
1Present address: Kyodo Yushi Co., Ltd., 2-2-30 Tsujido Kandai, Fujisawa, Kanagawa 251-8588, Japan.
Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received April 4, 2017; final manuscript received May 25, 2017; published online August 22, 2017. Assoc. Editor: Wang-Long Li.
J. Tribol. Jan 2018, 140(1): 011501 (9 pages)
Published Online: August 22, 2017
Article history
Received:
April 4, 2017
Revised:
May 25, 2017
Citation
Nogi, T., Shiomi, H., and Matsuoka, N. (August 22, 2017). "Starved Elastohydrodynamic Lubrication With Reflow in Elliptical Contacts." ASME. J. Tribol. January 2018; 140(1): 011501. https://doi.org/10.1115/1.4037135
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