This paper describes the stabilization method for small-bore circular journal bearings using starved lubrication. First, we describe our experimental examination to confirm the effect of supply oil conditions on stability of circular journal bearing by using a high-speed test rig. Then, we discuss the theoretical model considering the effect of amount of supply oil. Journal center trajectories are calculated by nonliner 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. We suggest an supply oil control mechanism to stabilize the journal bearing using starved lubrication. Finally, we verify experimentally the effectiveness of the proposed control mechanism on stability for high-speed small-bore journal bearings.
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