The surface non-flatness effect on the design of bush-type bearings in high pressure pumps and motors

An analytical and experimental investigation of behaviour of the bush end plates in gear pumps is presented. It is shown that the hydrostatic and hydrodynamic moment unbalance is not of primary importance here. Although a small amount of tilt of the bushes might be expected, the main lubrication mechanism does not appear to be the relative tilt of the surfaces but arises from surface imperfections and the tooth chamfering. The theoretical results are compared with those of experimentally measured clearances. © 1989