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Before the journal starts revolving, the lubricating system is not started and there is no oil present in the oil clearance. The shaft rests on the bearing surface. |
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Upon starting the engine, the shaft tends to roll up the side of the bearings. Here the lubricating system starts providing oil to the oil clearance space. As the shaft rotates more oil will be dragged into the oil clearance space, creating a wedge of oil between the shaft and the bearing. |
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At certain critical speed of the shaft, the oil wedge lifts away the shaft due to continuous supply of oil, which generates an oil film completely surrounding the shaft. Here the bearing load on the rotating shaft will be wholly carried over by the oil pressure. |
