Patent ID: 6149415
Filing Date: 2000-11-21
Classification: F04C,Y10T

Abstract:
An improved internal gear pump including a rotor and an idler disposed inside a pump chamber defined by a casing having an open end covered by a head plate, the casing having an inlet, the idler having a plurality of teeth alternatingly disposed between a plurality of roots, the improvement comprising:an idler feed groove communicating with the inlet and disposed in the head plate which provides enhanced fluid communication between the inlet and the roots of the idler,a crescent disposed on the head plate and spaced vertically below the idler and wherein the idler feed groove is disposed vertically above the crescent with an ungrooved section of the head plate disposed therebetween so that the idler roots are in alignment with the idler feed groove and the idler teeth extend, radially outward across the ungrooved section of the head plate and towards the crescent, and wherein no portion of the inlet is disposed below the crescent.