Effect of Lubricant Viscosity on Gearing Contact Fatigue Life

Abstract:

The paper considers the effect of lubricant viscosity, ν, on the contact fatigue life, N, in gearing applications. More than 40 sets of the thermal non-Newtonian EHL numerical calculations and six sets of disc fatigue tests under the conditions ranging from the mixed to full film lubrication are used. The results show that for improving gearing fatigue life it is generally useful to increase lubricant viscosity. But it is not simply the case that the higher the lubricant viscosity, the better. When lubricant viscosity, ν, is less than a critical value, νcr, a quantitative relation of is seen in the test results; When ν > νcr, however, increasing lubricant viscosity is found to reduce the fatigue life. Based on this result, the paper raises questions concerning the accuracy of the lubrication factor recommended by ISO/6336:1996.

• Periodical: Applied Mechanics and Materials (Volumes 190-191)
• Pages: 1295-1301
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.190-191.1295
• Online since: July 2012
• Authors: Xiu Mei Qi, Chuang Kuan Gao, Zeng Qiang Zhang
• Keywords: Fatigue Tests, Involute Spur Gear, Lubricant Viscosity, Lubrication Factor

References

[1] Y.J. Zhao, Y.K. Qiang, F.Q. Wang, Method to select lubricating oil about gear reducer, Coal Mine Machinery. 29 (2008), pp.158-159.

[2] D.J.Ge, X.Z.Mu, Situation and development trend of industrial gear oils, Energy Research and Management. 1 (2010), pp.9-12.

[3] J.Zong, An analysis to the application of lubrication technology in gear transmission, Zhejiang Metallurgy. 4 (2010), pp.22-25.

[4] L.Zhu, Discussion on the influence of lubrication on gear teeth surface damage,Lubricating Oil. 25(2010), pp.21-24.

[5] D.Zhu, Y.Z.Hu, A computer program package for the prediction of EHL and mixed lubrication characteristics, friction, subsurface stresses and flash temperature based on measured 3-d surface roughness, Tribology Transactions. 24 (2001), pp.383-390.

DOI: 10.1080/10402000108982471

[6] H.P. Evans, R.W. Snidle, K.J. Shariff, Deterministic mixed lubrication modeling using roughness measurements in gear applications, Tribology International. 42 (2009), pp.1406-1417.

DOI: 10.1016/j.triboint.2009.05.025

[7] S.Li, A.Kahramhn, A fatigue model for contacts under mixed elastohydrodynamic lubrication condition, International Journal of Fatigue. 33 ( 2011), pp.427-436.

DOI: 10.1016/j.ijfatigue.2010.09.021

[8] P.R. Yang, S.Z. Wen, A generalized reynolds equation for non-newtonian thermal EHL, Transactions ASME, J. Tribology. 112 (1990), pp.631-636.

DOI: 10.1115/1.2920308

[9] C.J.A. Roelands, Correlational aspects of the viscosity-temperature-pressure relationship of lubricating oil, PhD thesis, Delft, The Netherlands (1966).

[10] Z.Q. Zhang, Study on the effect of lubricant viscosity on gearing fatigue life, Degree of master essay of Taiyuan University of Technology (2008).

[11] M.Weck, A.Kruse , A.Gohritz, Determination of surface fatigue of gears material by roller tests, Journal of Mechanical Design. 100 (1978), pp.433-439.

DOI: 10.1115/1.3453947