US 3,945,779 AGranted

Bearings for the trunnions of gears in gear pumps or the like

AssigneeRobert Bosch GmbH

InventorsJan Vlemmings, Wilhelm Dworak

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Abstract

A gear pump wherein the trunnions of two or more mating gears are mounted directly in ring-shaped bearing members or in bearing sleeves which are fitted into the bearing members. The deformation of those surfaces of bearing members which are immediately adjacent to the end faces of the corresponding gears is prevented by enlarging the bores of the bearing members in close proximity to the end faces of the gears, by forming the internal surfaces of the bearing members with circumferentially complete or arcuate grooves, or by reducing the outer diameters of bearing sleeves in immediate proximity to the end faces of the gears. This insures that the deformation of bearing members in response to transmission of forces by the respective trunnions is not propagated all the way to those surfaces of the bearing members which are immediately adjacent to the end faces of the gears.

Claims15

Dependent claims

In a gear pump or an analogous fluid displacing machine, a combination comprising a pair of mating rotary gears each having two end faces and one of said gears having a trunnion extending from one of the respective end faces;

and a bearing structure including a ring-shaped body surrounding said trunnion and having a surface immediately adjacent to said one end face of said one gear, said trunnion being urged against said bearing structure when the machine displaces fluid whereby said trunnion applies against said body a resultant force acting substantially radially of said body and tending to deform that portion of said body which is located within a predetermined distance from the locus of application of said force to said bearing structure, said bearing structure having means for confining the ambit of said force to a region of said body which is remote from said surface so that the application of said force does not entail appreciable distortion of said surface such as would result in wear owing to friction between said surface and said one end face due to immediate proximity of said surface to said one end face.

Dependencies are inferred from the claim text.