Patent ID: 6092283
Filing Date: 2000-07-25
Classification: F04C,Y10T

Abstract:
A method of producing a gear pump operative to pump a fluid, such as an oil, the gear pump having structure that reduces noise and pressure ripples therein caused by air in the oil, comprising the steps of:forming a housing having a first surface, first and second intersecting cavities extending from the first surface generally perpendicular to the first surface, a second surface at the bottom of the first and second intersecting cavities, first and second shaft bores extending through the second surface generally in alignment with the first and second intersecting cavities respectively, an inlet passage communicating with at least a portion of the first and second surfaces and one side of the first and second intersecting cavities, an outlet passage communicating with at least a portion of the first and second surfaces and the other side of the first and second intersecting cavities;reducing the time needed to machine the housing of the gear pump by machining the first and second intersecting cavities with a boring tool, machining a first bleed slot in the first surface with the same boring tool at a location generally adjacent the second cavity and the outlet passage, and machining a second bleed slot in the first surface with the same boring tool at a location generally adjacent the second cavity and the outlet passage;inserting first and second intermeshing gears having gear shafts extending therefrom in the first and second intersecting cavities respectively and the first and second shaft bores respectively;placing a cover plate having a third surface and first and second shaft bores therein over the first and second gear shafts respectively of the respective intermeshing first and second gears; andsecuring the housing and cover plate with a plurality of fasteners.