Research on Lubrication Model of Rock Bit Bearings with Non-Newtonian Medium

Guorong Wang, Wang Juan, Lin Zhong

Southwest Petroleum University, Chengdu, China.

DOI: 10.4236/mme.2012.21001                

Abstract

Lubrication media of rock bit journal bearing is non-Newtonian fluid, and because of structure limitations, lubricant supply is only from the inside track and its rheological properties are relatively complex. In general studies, the non- Newtonianism of lubrication media of rock bit journal bearing is neglected to simplify the research process. Based on the universal Reynolds equation of non-Newton media, the mathematical model of lubrication analysis was suitable for the rock bit bearing working conditions was established. Then according to the experimental results of rheological properties of RB-type lubricating grease, the equivalent viscosity of the model was established and this model can be solved by the method used in solving the Reynolds equation of Newton fluid.

Keywords

Journal Bearing; Rock Bit; Lubrication Model; RB Grease

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	Y. L. Fu, P. R Yang and J. Zhu, “A Method and Numerical Simulated Study on the Non-Newtonian Lubrication for Journal Bearing,” Journal of System Simulation, Vol. 15, No. 6, 2003, pp. 902-904.
[2]	T. A. Osman, “Effect of Lubricant Non-Newtonian Behavior and Elastic Deformation on the Dynamic Performance of Finite Journal Plastic Bearings,” Tribology Letters, Vol. 17, No. 1, 2004, pp. 31-40. doi:10.1023/B:TRIL.0000017416.95176.30
[3]	C. Aium-pornsin and M. Mongkolwongrojn, “Influence of Surface Roughness on Elastohydrodynamic Journal Bearings with Non-Newtonian Lubricants,” Advanced Tribology, Part 3, I., 2010, pp. 50-51. doi:10.1007/978-3-642-03653-8_20
[4]	S. Ialam, A. Shah, C. Y. Zhou and I. Ali, “Homotopy Perturbation Analysis of Slider Bearing with Powell-Eyring Fluid,” Zeitschrift für Angewandte Mathematik und Physik, Vol. 60, No. 6, 2009, pp. 1178-1193. doi:10.1007/s00033-009-7034-9
[5]	N. Kousar and S. Liao, “Series Solution of Non-similarity Boundary-Layer Flows over a Porous Wedge,” Transport in Porous Media, Vol. 83, No. 2, 2010, pp. 379-412. doi:10.1007/s11242-009-9450-x
[6]	W.-L. Li, “Derivation of Modified Reynolds Equation: A Porous Media Model with Effects of Electrokinetics,” Journal of Tribology, Vol. 131, No. 3, 2009, Article ID 031701. doi:10.1115/1.3140610
[7]	S. Verma, V. Kumar and K. D. Gupta, “Analysis of Multirecess Hydrostatic Journal Bearing Operation with Micropolar Lubricant,” Journal of Tribology, Vol. 131, No. 4, 2009, Article ID 021103, pp. 1-9.
[8]	G. R. Wang, “Research on Working Mechanism of Rock Bit Floating Ring Journal Bearings,” Southwest Petroleum University, Chengdu, 2004.
[9]	H. P. Jost, “Tribology: The First 25 Years and Byond-Achievements, Shortcomings and Future Tasks,” Industrial Lubrication and Tribology, Vol. 44, No. 2, 1992, pp. 22-27.
[10]	P. R. Yang and S. Z. Wen, “A Generalized Reynolds Equation Based on Non-Newtonian Flow in Lubrication Mechanics,” Acta Mechanica Sinica, Vol. 6, No. 4, 1999, pp. 289-295. doi:10.1007/BF02486885
[11]	K. S. Wu, “Research on Strength of Three-Dimensional Contact Finite Element in Rock Bit Journal Bearing System,” Southwest Petroleum University, Chengdu, 2003