Journal or plain bearing includes a shaft which rotates freely in a supporting metal sleeve or shell called bearing. There are no rolling elements in journal bearing. Its design and manufacturing are simple, but the performance is difficult. Journal bearing consists of two main components one is shaft which rotates freely inside the casing which is cylindrical in form. The bearing is clamped to the housing. The lubricating film is produced by the gas or liquid which separates the journal and bearing surfaces. In this paper, for performance enhancement of journal bearing mainly bearing oil temperature and additive effects have been taken into consideration.

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