A running torque analysis was performed on axially loaded deep groove ball bearings lubricated with a polymer lubricant. The analysis included a Type I and a Type II bearing. The Type I bearing has a stamped steel riveted cage with its cavity packed with the polymer lubricant. The ball surface, except for the contact points of the ball and the raceways, was covered with the polymer lubricant. The Type II bearing had the polymer lubricant packed only on the riveted parts of the cage; the balls were not covered with the polymer lubricant. The analysis was applied to a 6206 deep groove ball bearing axially loaded in a range typical of preloads applied in actual application to this size bearing to establish bearing tare torque. The results were compared to an available database. The running torque formulas for deep groove ball bearings with polymer lubricant under axial load were proposed as the sums of the running torque caused by the shearing resistance of the mineral oil between the bearing rings and the polymer lubricant, the elastic hysteresis, the differential slip, the spinning friction of the balls, the elastohydrodynamic lubrication (EHL) viscous rolling resistance, and the friction between the balls and the polymer lubricant (or the cage). The effects of the sources of the running torque were investigated. In the case of the Type I bearing, the running torque caused by the friction between the balls and the polymer lubricant, the EHL viscous rolling resistance, and the shearing resistance of the mineral oil between the bearing rings and the polymer lubricant significantly affect the running torque. In the case of the Type II Bearing, the running torque caused by the EHL viscous rolling resistance and the shearing resistance of the mineral oil between the bearing rings and the polymer lubricant significantly affect the running torque. A reasonable correlation exists between the analysis and the database. However, the analysis needs to be further validated with bearing data from different size deep groove ball bearings run under varying loads and speeds.
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e-mail: kanatsu@nsk.com
e-mail: ohta@mech.nagaokaut.ac.jp
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October 2008
Research Papers
Running Torque of Ball Bearings With Polymer Lubricant (Running Torque Formulas of Deep Groove Ball Bearings Under Axial Loads)
Masayuki Kanatsu,
Masayuki Kanatsu
Dr. of Engineering
Basic Mechanics Laboratory, Basic Technology Research Center, Corporate Research and Development Center,
e-mail: kanatsu@nsk.com
NSK Ltd.
, 1-5-50 Kugenuma Shinmei, Fujisawa, Kanagawa 251-8501, Japan
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Hiroyuki Ohta
Hiroyuki Ohta
Associate Professor
Department of Mechanical Engineering,
e-mail: ohta@mech.nagaokaut.ac.jp
Nagaoka University of Technology
, 1603-1 Kamitomioka, Nagaoka, Niigata 940-2188, Japan
Search for other works by this author on:
Masayuki Kanatsu
Dr. of Engineering
Basic Mechanics Laboratory, Basic Technology Research Center, Corporate Research and Development Center,
NSK Ltd.
, 1-5-50 Kugenuma Shinmei, Fujisawa, Kanagawa 251-8501, Japane-mail: kanatsu@nsk.com
Hiroyuki Ohta
Associate Professor
Department of Mechanical Engineering,
Nagaoka University of Technology
, 1603-1 Kamitomioka, Nagaoka, Niigata 940-2188, Japane-mail: ohta@mech.nagaokaut.ac.jp
J. Tribol. Oct 2008, 130(4): 041507 (10 pages)
Published Online: August 7, 2008
Article history
Received:
October 23, 2007
Revised:
June 23, 2008
Published:
August 7, 2008
Citation
Kanatsu, M., and Ohta, H. (August 7, 2008). "Running Torque of Ball Bearings With Polymer Lubricant (Running Torque Formulas of Deep Groove Ball Bearings Under Axial Loads)." ASME. J. Tribol. October 2008; 130(4): 041507. https://doi.org/10.1115/1.2959119
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