Internal gear pump with non-equal teeth pitch spacings

摘要

An internal gear pump which has a crescent (3) disposed between an outer rotor (2) and an inner rotor (1) having a trochoidal tooth profile, and which reduces vibrations caused by pulsations generated when the fluid is discharged. The internal gear pump has an outer rotor (2) having internal teeth (21) formed therein, an inner rotor (1) disposed on the inner peripheral side of the outer rotor and having formed therein external teeth (11) that mesh with the internal teeth (21), and a crescent (3) disposed in a clearance between the outer rotor and the inner rotor. Pitch spacings of the external teeth (11) of the inner rotor (1) are formed as non-equal spacings, and pitch spacings of the internal teeth of the outer rotor correspond to the pitch spacings of the external teeth of the inner rotor.