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Research Papers: Hydrodynamic Lubrication

Experimental Study on the Stabilization of Small-Bore Journal Bearings by Controlling Starved Lubrication and Bearing Orientation Angle

[+] Author and Article Information
Hiromu Hashimoto

Graduate School of Engineering, Tokai University, 1117 Kitakaname, Hiratsuka-shi, Kanagawa-ken 259-1292, Japanhiromu@keyaki.cc.u-tokai.ac.jp

Masayuki Ochiai

Graduate School of Engineering, Tokai University, 1117 Kitakaname, Hiratsuka-shi, Kanagawa-ken 259-1292, Japan

J. Tribol 131(1), 011705 (Dec 04, 2008) (8 pages) doi:10.1115/1.2991128 History: Received May 01, 2008; Revised August 20, 2008; Published December 04, 2008

Journal bearings are widely used for supporting high-speed rotating machinery, such as turbine, compressor, and HDD spindle, because of their high load carrying capacity, stability, and durability. Recently, the engineering trend is oriented to higher speed and smaller sizes of rotating machinery, and then it is important to enhance stabilities for the small-bore journal bearings. Tilting pad journal bearing is generally used for high-speed rotating machineries because of their advantages of stabilization. However, there are some problems using compact size rotating machineries for their high manufacturing cost and complicated structure. Therefore, it is necessary to enhance the stability of more simple bearings compared with tilting pad bearing in order to use for small-size rotating machinery. This paper describes the stabilization method of the small-bore journal bearing based on the combination mechanism with starved lubrication and orientation angle change. It is found that the stabilization of small-bore journal bearings is improved drastically by hybrid lubrication combining these two kinds of mechanism.

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Copyright © 2009 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Geometry of journal bearings

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Figure 2

Geometry of test rig

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Figure 3

Photo of test rig and bearing

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Figure 4

Results of preliminary experiments

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Figure 5

Variation characteristics of journal bearings at orientation angle of γ=0 deg

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Figure 6

Variation characteristics of journal bearings at orientation angle of γ=90 deg

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Figure 7

Variation characteristics of journal bearings at orientation angle of γ=−90 deg

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Figure 9

Temperature increase of circular bearings with rotational speed

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Figure 10

Variation characteristics of journal bearing by hybrid lubrication

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Figure 8

Locus of journal center with rotational speed under various lubrication conditions

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