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Research Papers: Hydrodynamic Lubrication

Stabilization Method for Small-Bore Journal Bearings Utilizing Starved Lubrication

[+] Author and Article Information
Hiromu Hashimoto

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

Masayuki Ochiai

Graduate School of Science and Technology, Tokai University, 1117 Kitakaname, Hiratsuka-shi, Kanagawa 259-1292, Japan

J. Tribol 132(1), 011703 (Nov 17, 2009) (7 pages) doi:10.1115/1.4000269 History: Received August 22, 2008; Revised July 30, 2009; Published November 17, 2009; Online November 17, 2009

This paper describes the stabilization method for small-bore circular journal bearings using starved lubrication. First, we describe the experimental examination to confirm the effect of supply oil conditions on stability of circular journal bearing by using a high-speed test rig. Then, the theoretical model considering the effect of amount of supply oil is discussed. Journal center trajectories are calculated by nonlinear motion analysis under various conditions. The theoretical results agree well with the experimental ones for three types of supply oil conditions and the mechanism of the stabilization by using the starved lubrication for small-bore journal bearings is clarified. Moreover, we suggest a supply oil control mechanism to stabilize the journal bearing using starved lubrication. Finally, the effectiveness of the proposed control mechanism on stability for high-speed small-bore journal bearings is verified experimentally.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Geometry of test bearing

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Figure 2

Schematic view of test rig

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Figure 3

Variation in experimental results under flooded and starved lubrication conditions

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Figure 4

Geometry of journal bearing under starved lubrication

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Figure 5

Oil flow around the control volume

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Figure 6

Flow chart of calculation considering the oil quantity balance

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Figure 7

Variation in cavitation pattern (N=3500 rpm)

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Figure 8

Journal center trajectories and pressure distributions under flooded lubrication (Qin=3.0×10−6 m3/s)

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Figure 9

Journal center trajectories and pressure distributions under starved lubrication (Qin=1.4×10−6 m3/s)

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Figure 10

Journal center trajectories and pressure distributions under starved lubrication (Qin=0.5×10−6 m3/s)

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Figure 11

Schematic view of test rig for supply oil control mechanism

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Figure 12

Experimental results for supply oil control mechanism

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