LUBRICATUON BETWEEN BALL BEARING BORE AND SHAFT WITH CLEARANCE FIT (1) - FLOTATION OF INNER RING BY HYDRODYNAMIC OIL FILM.

In order to make easy to amount a bearing, the inner ring of the ball bearing was fitted with a clearance and a lubricating oil was supplied to this clearance. As the rotation speed of the shaft was increased the inner ring was gradually lifted from the shaft by the hydrodynamic oil film. The minimum speed necessary to make up and oil film was investigated and the formation of oil film in connection with a rolling bearing suggests the formation of a serial radial hybrid bearing.