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TECHNICAL PAPERS

An Experimental Investigation of Grease-Lubricated Journal Bearings

[+] Author and Article Information
Xiaobin Lu

Department of Mechanical Engineering,  Louisiana State University, 2508 CEBA, Baton Rouge, LA 70803

M. M. Khonsari1

Department of Mechanical Engineering,  Louisiana State University, 2508 CEBA, Baton Rouge, LA 70803khonsari@me.lsu.edu

1

Corresponding author.

J. Tribol 129(1), 84-90 (Oct 10, 2006) (7 pages) doi:10.1115/1.2401216 History: Received June 20, 2006; Revised October 10, 2006

A series of experimental results is presented to explore the frictional characteristics of a grease-lubricated journal bearing. Load, grease type, and bushing material are varied to examine their effects on the friction coefficient. The results attest to the existence of distinctive regimes in grease lubrication akin to the oil-lubricated Stribeck curve. A mixed elastohydrodynamic lubrication model for line contacts is employed to estimate the coefficient of friction in mixed lubrication regime. The simulation results capture the basic characteristics of mixed lubrication.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 4

The friction coefficient as a function of velocity (ALG#1 grease, bronze bushing)

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Figure 5

The friction coefficient as a function of Sommerfeld number (Moly#5 grease, steel bushing)

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Figure 6

Comparison of two greases with SAE40 oil lubrication (667N load, bronze bushing)

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Figure 7

Comparison of two greases with SAE40 oil lubrication (890N load, bronze bushing)

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Figure 8

Comparison of two greases with SAE40 oil lubrication (1112N load, bronze bushing)

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Figure 9

Comparison of simulation and experiment (667N load, Moly#5 grease, steel bushing)

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Figure 10

Comparison of simulation and experiment (890N load, Moly#5 grease, steel bushing)

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Figure 11

Comparison of simulation and experiment (1112N load, Moly#5 grease, steel bushing)

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Figure 1

The friction coefficient as a function of velocity (Moly#5 grease, steel bushing)

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Figure 2

The friction coefficient as a function of velocity (ALG#1 grease, steel bushing)

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Figure 3

The friction coefficient as a function of velocity (Moly#5 grease, bronze bushing)

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