Abstract: Cooling system for a hydrodynamic bearing bushing of annular appearance positioned in a support body, equipped with means of distributing cold oil under pressure to a shaft rotating in the bearing bushing, wherein it consists of a thin annular shell, the external surface of which is closely fitted into the bore of said support body, grooves being made in that part of said bore that corresponds to the angular region of the bearing bushing on which the load is applied during operation, said grooves being supplied with cold oil tapped downstream from the distribution means.

Abstract: Hydrodynamic bearing with four lobes with centres of curvature that are eccentric relative to its geometrical centre, said lobes being separated by oil feed grooves wherein the lobes are dissymmetrical and present;—angular apertures of at least two different values;—at least two different eccentricities relative to the geometrical centre of the bearing; the centres of two opposing lobes being aligned with the geometrical centre of the bearing.