Patent ID: 6126420
Filing Date: 2000-10-03
Classification: F04C

Abstract:
An infinitely variable ring gear pump comprisinga stationary casing,an internal rotor (3) in the casing rotatably supported and driven by means of a shaft (2) andan external rotor (4) likewise rotatably supported, meshing with said internal rotor (3),a gear running set formed by external teeth of the internal rotor and internal teeth of the external rotor, the difference in the number of teeth of the gear ring running set (5) being equal to unity, having a tooth shape in which a plurality of expanding and contracting displacement cells (7) each sealed off from the other materializes due to tooth tip contact, andan adjusting gear (20; 21) being formed by an external toothing (24; 22; 52; 100) on an adjusting ring (14) and an internal toothing (24'; 23; 53; 103) of said casing, the external toothing (24; 22; 52; 100) meshing with the internal toothing (24'; 23; 53; 103), andkidney-shaped low and high pressure ports (8, 9) fixedly arranged laterally in the region of said displacement cells (7) being provided in the casing, said ports being separated from each other by webs (10, 11) andthe angular position of the eccentric axis (eccentricity 17) of said ring gear running set (5) being variable relative to the casing,the support (12) of said external rotor (4) of said ring gear running set (5) occurring at an outer diameter (13) of the latter in said adjusting ring (14) the same in width,the adjusting gear (20; 21) being configured as a complete or partial internal gear (24, 24'; 22, 23; 52, 53; 100, 103) having the same eccentricity (17) as said ring sear running set (5) wherebythe adjusting ring (14) is rollable with zero slip by its outer circumferential or pitch circle (15) on an inner circumferential or pitch circle (16) of said casing,the difference in the diameters of said two circumferential or pitch circles (15, 16) being twice the eccentricity (17) of said ring gear running set (5).