Abstract
The effects of temperature distribution and external vibration on stabilized supply flow rate of small bore journal sliding bearing were experimentally investigated. Journal sliding bearings are used widely in many rotational machineries such as engine, turbine, HDD etc.. However, journal sliding bearings generate oilwhip under high speed operation. In order to solve this problem, Hashimoto suggested a stabilization method for suppressing oilwhip by using starved lubrication in which supply oil rate is reduced. However, the starved lubrication have the risks of sudden rising of temperature and regenerating oilwhip caused by external vibrations. In this study, the temperature distribution around the axis and the effect of the external vibrations was investigated to make clear the behaivior of the oil. The temperature distributions were measured with thermocouples and cavitations generating in the bearing clearance were visualized by using a high-speed camera. In addition, the vibration test was carried out with an impulse hammer and an acceleration sensor. The area was observe for the temperature to increase rapidly from the results of reducing supply of flow rate. In addition, in the case of increasing supply frow rate, the difference between the maximum temperature and minimum temperature in the bearing is reduced gradually. Moreover, the oil whip was occurred by the external vibration. It was found that both risks were possible to avoid by adjusting the supply flow rate adequately.
