On Transient EHL of a Skew Roller Subjected to a Load Impact in Rolling Bearings

Abstract:

Based on the non-steady state operating condition in machine elements, numerical analysis of a transient elastohydrodynamic lubrication (EHL) finite line contact between a skewed roller and an outer race in cylindrical roller bearings was carried out, and a complete numerical solution of skewed roller pairs EHL under the transient condition was obtained. The effects of the load impact, together with the skewing angle impulses on the lubricating performance of skew roller pairs were discussed. Results show that, different from the steady state, the transient effect of the skew roller lubrication is mainly governed by the skew angle impulse, and the load impact. The film dimple is generated during the load impact, or the skewing angle impulse due to the normal approach velocity of the film. Compared to that of the ideal roller, the minimum film thickness decreases due to the roller skew when the transient load happens. Variation in the skewing angle leads to contrary distribution of the film thickness at the two half parts of the roller. Meanwhile, it can decrease the minimum film thickness and be harmful to the lubrication compared to the steady state. Consequently, the transient effect in the process of lubrication of skew roller pairs should not be neglected.

• Periodical: Key Engineering Materials (Volume 739)
• Pages: 108-119
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.739.108
• Online since: June 2017
• Authors: Xiao Ling Liu*, Da Tong Song, Pei Ran Yang
• Keywords: Load Impact, Skew Angle Variation, Skewing Roller, Transient EHL

References

[1] T.A. Harris, M.N. Kotzalas, and Yu W. K: STLE Tribol. Trans. Vol. 41(4) (1998), p.572–578.

[2] T.A. Harris and M.N. Kotzalas: Rolling Bearing Analysis Fifth Edition, Advanced Concepts of Bearing Technology (Taylor & Francis Group, LLC, 2006).

DOI: 10.1201/9781420006582

[3] Y. Yang, S. Danyluk and M. Hoeprich: Tribol. Lett. Vol. 6 (1999), p.221–223.

[4] Y. Yang, S. Danyluk and M. Hoeprich: ASME J. Tribol. Vol. 122(3) (2000), p.534–538.

[5] D. Osorno: Rolling Element Skew Measurement in a Spherical RollerBearing Utilizing a CPD Probe. Dissertation of Master Thesis. (Georgia: Georgia Institute of Technology, 2005).

[6] X.L. Liu, S.Y. Li, P. Yang and P.R. Yang: STLE Tribol. Trans. Vol. 56(6) (2013), p.929–942.

[7] Z.M. Jin, P.R. Yang, J.L. Cui and D. Dowson: Proc. Inst. Mech. Engnr., Part J: Journal of Engineering Tribology Vol. 218(J3) (2004), p.211–224.

[8] M. Kushwaha and H. Rahnejat: Journal of Physics D: Applied Physics, Vol. 37(2004), p.2018–(2034).

[9] D. Zhu, J.X. Wang, N. Ren and Q.J. Wang: ASME J. Tribol. Vol. 134(1) (2012), p.011504.

[10] J. Wang, S.Y. Qu and P. R. Yang: Tribol. Int., Vol. 34(3) (2001), p.191–202.

[11] C.J.A. Roelands: Correlation Aspects of Viscosity-Temperature-Pressure Relationship of Lubricating Oils. Dissertation of Doctor Thesis. (Delft: Delft University of Technology, 1966).

DOI: 10.1115/1.3451519

[12] D. Dowson and G.R. Higginson: Elastohydrodynamic Lubrication(Oxford: Pergamon Press, 1977).

[13] C.H. Venner: Multilevel Solution of the EHL Line and Point Contact Problems. Dissertation of Doctor Thesis. (Enschede: University of Twente, 1991).

[14] A. Brandt and A.A. Lubrecht: J. Comput. Phys. Vol. 90(2) (1990), p.348–370.