0
Research Papers: Hydrodynamic Lubrication

Load Capacity of a Grooved Circular Step Thrust Bearing

[+] Author and Article Information
M. Zakir Hossain

Assistant Professor
e-mail: mhossai8@alumni.uwo.ca

M. Mahbubur Razzaque

Professor
e-mail: mmrazzaque@me.buet.ac.bd
Department of Mechanical Engineering,
Bangladesh University of
Engineering and Technology,
Dhaka 1000, Bangladesh

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received January 2, 2013; final manuscript received August 25, 2013; published online November 7, 2013. Assoc. Editor: Jordan Liu.

J. Tribol 136(1), 011705 (Nov 07, 2013) (8 pages) Paper No: TRIB-13-1002; doi: 10.1115/1.4025549 History: Received January 02, 2013; Revised August 25, 2013

A parametric analysis based on narrow groove theory (NGT) has been presented for estimating the load capacity of a grooved circular step thrust bearing. Three types of grooving arrangements of the bearing surface, namely, (a) both the step and the recess are grooved, (b) only the step is grooved, and (c) only the recess is grooved, are considered. It is found that grooving in the step provides the most significant enhancement on the load capacity. The load capacity and the pumping power loss are affected by the step location, step height, and inertia. There is no benefit of making step location smaller than 0.6 that corresponds to the minimum power loss due to pumping. At a very large value of step location, say 0.85, the load capacity drops drastically. To take advantage of inertia as well as grooving, the dimensionless step location should be 0.6 ∼ 0.85 and the dimensionless step height should be less than 5. The load capacity also depends on groove geometry parameters such as groove inclination, groove depth, and fraction of area grooved. The groove inclination angle has been found to be the most important parameter that determines the increase or decrease in load capacity. For the most enhancement of load capacity, the inclination angle should be 135 deg with the direction of rotation, the groove depth should be at least twice the minimum film thickness, and the fraction of the step surface area grooved should be around 0.5.

FIGURES IN THIS ARTICLE
<>
Copyright © 2014 by ASME
Your Session has timed out. Please sign back in to continue.

References

Fuller, D. D., 1984, Theory and Practice of Lubrication for Engineers, 2nd ed., John Willey and Sons, New York.
Bhushan, B., 1999, Principles and Applications of Tribology, John Willey and Sons, New York.
Khonsari, M. M., and Booser, E. R., 2001, Applied Tribology: Bearing Design and Lubrication, John Willey and Sons, New York.
Dowson, D., 1961, “Inertia Effects in Hydrostatic Thrust Bearings,” ASME J. Basic Eng., 83(2), pp. 227–234. [CrossRef]
Zhu, Q., and Zhang, W. J., 2000, “A Numerical Procedure Based on Boundary Element Method Analysis of the Archimedean Spiral Grooved Thrust Oil Bearing,” ASME J. Tribol., 122(3), pp. 565–572. [CrossRef]
Hsing, F. C., 1972, “Formulation of a Generalized Narrow Groove Theory for Spiral Grooved Viscous Pumps,” ASME J. Lubr. Techol., 94(1), pp. 81–85. [CrossRef]
Constantinescu, V. N., and Galetuse, S., 1992, “On Extending the Narrow Spiral-Groove Theory to Configurations of Interest in Seals,” ASME J. Tribol., 114(3), pp. 563–566. [CrossRef]
Vohr, J. H., and Chow, C. Y., 1965, “Characteristics of Herringbone-Grooved, Gas-Lubricated Journal Bearings,” ASME J. Basic Eng., 87(3), pp. 568–578. [CrossRef]
Razzaque, M. M., and Kato, T., 1999, “Effects of Groove Orientation on Hydrodynamic Behavior of Wet Clutch Coolant Films,” ASME J. Tribol., 121(1), pp. 56–61. [CrossRef]
Razzaque, M. M., and Hossain, M. Z., 2004, “Inertia Effects in Grooved Thrust Bearings,” Proceedings of the 1st International Conference on Advanced Tribology, Singapore, Dec. 1–3, pp. B55–B56.
Razzaque, M. M., and Hossain, M. Z., 2005, “Effects of Grooving in a Circular Step Thrust Bearing,” Proceedings of the ASME World Tribology Congress III, Washington, D.C., Sept. 12–16, Paper No. WTC2005-63431.
Razzaque, M. M., and Kato, T., 1999, “Effects of a Groove on the Behavior of a Squeeze Film Between a Grooved and a Plain Rotating Annular Disk,” ASME J. Tribol., 121(4), pp. 808–815. [CrossRef]
Razzaque, M. M., and Kato, T., 2001, “Squeezing of a Porous Faced Rotating Annular Disk Over a Grooved Annular Disk,” STLE Tribol. Trans., 44(1), pp. 97–103. [CrossRef]

Figures

Grahic Jump Location
Fig. 1

(a) Model of the grooved circular step thrust bearing and (b) the top view of a grooved step

Grahic Jump Location
Fig. 3

Radial pressure distribution (α = fraction of area grooved = 0.1, β = groove inclination angle = 135 deg, Δ = hg/hr = 1.2)

Grahic Jump Location
Fig. 4

Variation of load capacity with step location for the three cases of grooving of the bearing surface

Grahic Jump Location
Fig. 5

Variation of load capacity with step location, ri/ro and step height, ε

Grahic Jump Location
Fig. 6

Effect of inertia, S on load capacity at various step locations

Grahic Jump Location
Fig. 7

Variations of torque, flow rate, and pumping power loss with step location

Grahic Jump Location
Fig. 8

Effect of groove inclination with the direction of rotation and step location on load capacity

Grahic Jump Location
Fig. 9

Effect of fraction of area grooved and step location on load capacity

Grahic Jump Location
Fig. 10

Effect of groove depth and step location on load capacity

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In