Patent ID: 6095782
Filing Date: 2000-08-01
Classification: F04C

Abstract:
A crescentless internal gear pump, comprising:a housing having an intake connection and a pressure connection;an internally toothed internal gear including an outside surface, said internal gear disposed for rotation within said housing, said each tooth including a head and a base, said internal gear having radial openings that form a conducting connection between a said tooth base and said outside surface;a pinion having teeth with each tooth including a head, said pinion rotatably disposed within said housing and meshing with said internal gear;said teeth of one of said internal gear and pinion having a profile groove with a base provided in said heads into which a sealing element is disposed and which can slide on an opposing said tooth head; andsaid sealing element includes a sealing surface, said sealing element includes a channel that produces a conducting connection between said profile groove base and said sealing surface, said channel enclosed by the body of the sealing element as viewed in the rotation direction of said pinion, said sealing element slightly movable in said profile groove in the radial direction to form a gap between said sealing element and an inner surface of said profile groove so that said profile groove base is in a conducting connection with said pressure connection, one of said sealing element and profile groove configured so that the width of said gap in any radial position of sealing element is substantially the same.