Abstract

This paper describes an extension of the investigation of the running-in characteristics of journal bearings which was a part of the program of research on lubrication conducted at the National Bureau of Standards in cooperation with the Special Research Committee on Lubrication of The American Society of Mechanical Engineers. The results of tests on three kinds of white-metal bearings are given.

A four-bearing friction machine was used to determine the effect of progressive amounts of running in, upon the frictional characteristics of the bearings. The results are compared with those of previous investigations and all are in agreement in providing an indication that the major effect of running in is to reduce the friction losses at low values of ZN/P and to increase the permissible operating range. The results also give a comparison of the frictional and running-in characteristics of the various metals.

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