How to understand that \"the oil temperature is also determined by the bearing clearance\"”
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“If the vibration increases as the oil temperature rises, it is usually due to an excessive bearing clearance; if the vibration decreases as the oil temperature rises, it may be because the bearing clearance is too small. ”How to understand this sentence. From Shen Qinggen’s “Fault Diagnosis Technology”
This needs to be understood in terms of both the manufacturing process and the design of the equipment. The gap certainly determines the oil temperature, as the gap is a variable; when the inlet oil pressure remains stable, the return oil temperature will change, and this change is actually caused by the heat generated by the bearings.
High oil temperature results in a thinner oil film and better fluidity； When the oil temperature is low, the oil film thickens and its fluidity decreases. Understanding it this way makes it clear.
API610 6.10.1.3 contains similar provisions.