Abstract
To visualize the oil film formed in the bearing clearance, a porous bronze bearing impregnated with a fluorescent dyed oil is used for the test bearing, and the oil film is rendered visible by a pair of ultraviolet lamps. The photographs are taken by a camera attached to an endoscope inserted into a hollow glass shaft. It is observed that the oil film is formed in the loaded part of the bearing. In particular, it extends over a wide range in the circumferential direction for the relatively small static load and high oil-feed pressure. However, even if under hydrodynamic lubrication conditions, the angular extent of the oil film for the porous journal bearing is significantly small as compared to that for the solid journal bearing. This suggests the previous postulate that the pressure-generating part of the oil film occupies half of the bearing circumference is not applicable to the theoretical analysis of the porous journal bearings, unless unlimited oil is supplied to the bearing gap through the oil-feed hole.
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