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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.

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References

Figures

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Fig. 1

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

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Fig. 3

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

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Fig. 7

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

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Fig. 8

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

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Fig. 9

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

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Fig. 10

Effect of groove depth and step location on load capacity

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Fig. 6

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

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Fig. 5

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

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Fig. 4

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

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