Browse > Article
http://dx.doi.org/10.9725/kts.2021.37.1.7

Life Evaluation of Grease for Ball Bearings According to Temperature, Speed, and Load Changes  

Son, Jeonghoon (Polymer Material Research Team, R&D Center, ILJIN Bearing)
Kim, Sewoong (Polymer Material Research Team, R&D Center, ILJIN Global)
Choi, Byong Ho (Department of Mechanical Engineering, Korea University)
Lee, Seungpyo (R&D Center, ILJIN Global)
Publication Information
Tribology and Lubricants / v.37, no.1, 2021 , pp. 7-13 More about this Journal
Abstract
Ball bearing is a device that supports and transmits a load acting on a rotating shaft, and it is a type of rolling bearings that uses the rolling friction of the balls by inserting balls between the inner ring and the outer ring. Grease, which is prepared by mixing a thickener with a base oil, is a lubricant commonly used in bearings and has the advantage of a simple structure and easy handling. Bearings are increasingly being used in high value-added products such as semiconductors, aviation, and robots in the era of the 4th industrial revolution. Accordingly, there is an increasing demand for bearing grease. The selection of grease is an important factor in the bearing design. Therefore, a study must be conducted on the grease life evaluation to select an appropriate grease according to operating conditions such as a high temperature, high rotational speed, and high load. In this study, we evaluate the life of ball-bearing grease according to various operating conditions, namely, temperature, speed, and load changes. For this, we develop and theoretically verify a grease life test machine for ball bearings. We conduct a life test of grease according to various operating conditions of bearings and predict the grease life with a 10% and 50% failure probability using the Weibull analysis. In addition, we analyze the oxide characteristics of the grease over time using the Fourier transform infrared spectroscopy and the deterioration characteristics of the grease using the carbonyl index.
Keywords
grease life evaluation; ball bearing; grease life test machine; weibull; FT-IR;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
연도 인용수 순위
1 Kim, S. K., Kim, B. K., Han, J. D., "A Study on Synthesis and Characteristics of the Optimum Urea Type Grease for Rolling Bearings", J. Korean Soc. Tribol. Lubr. Eng., Vol.22, No.5, pp.269-275, 2006, https://doi.org/10.9725/kstle.2006.22.5.269   DOI
2 Kim, S., Han, H., Han, J., "Endurance and Characteristics of Rolling Bearing Grease after Optimization", Proc. Fall Conf. Korean Soc. Tribol. Lubr. Engr., pp.63-67, Seoul, Korea, November 2005.
3 Choi, B. L., Lee, H. J., Son, J. H., Park, H. S., Choi, B. H., "Grease Lubrication Life Evaluation at High Temperature Environment", Proc. Fall Conf. Korean Tribol. Soc., Pusan, Korea, October 2019.
4 Son, J. H., "Grease Service Life Evaluation at High Temperature/Speed Environment", Proc. Fall Conf. Korean Tribol. Soc., Daejeon, Korea, September 2020.
5 Lim, Y. K., Lee, E. H., Lee, J. M., Jeong, C. S., "Performance of Automotive Wheel Bearing Grease by Water Contents", J. Korean Soc. Tribol. Lubr. Eng., Vol.27, No.5, pp.275-280, 2011, https://doi.org/10.9725/kstle.2011.27.5.275   DOI
6 Park, Y. H., Son, J. H., Lee, W. J., "Study on the Temperature characteristics of the Grease according to the rotational speed", Proc. Fall Conf. Korean Soc. Tribol. Lubr. Engr., Moojoo, Korea, October 2016.
7 DIN 51821, "Testing of lubricants - Test using the FAG roller bearing grease testing apparatus FE9", Deutsches Institut fur Normung E.V. (DIN), 2016.
8 Jang, S. -G., Kim, J. -H., Ryu, B. -T., Hwang, J. -M., "Arrhenius Kinetic Constants Analysis of BKNO3 under Accelerated Aging", J. Korean Soc. Propuls. Eng., Vol.20, No.4, pp.34-39, 2016.   DOI
9 Minitab, LLC, https://support.minitab.com/en-us/minitab/18/, Version 18.1, Accessed February 4, 2021.
10 Weibull, W., A Statistical Theory of the Strength of Materials, Ingeniorx Vetenskapsakademiens Handlingar, Stockholm, Sweden, 1939.
11 Yang, H. S., Shin, J. H., Park, J. W., Sung, B. J., "A Study on the Life Characteristic of an Automotive Water-pump Bearing Using the Accelerated Test Method", J. Korean Soc. Tribol. Lubr. Eng., Vol.31, No.2, pp.35-41, 2015, https://doi.org/10.9725/kstle.2015.31.2.35   DOI
12 Gedde, U. W., Terselius, B., Jansson, J. F., "A new method for the detection of thermal oxidation in polyethylene pipes", Polymer Testing, Vol.2, Issue 2, pp.85-101, 1981.   DOI