OUTER ROTOR CURVE CORRECTING METHOD FOR INTERNAL GEAR PUMP IN TROCHOIDAL ENGAGEMENT

摘要

PURPOSE:To reduce a clearance between an outer rotor and an inner rotor as well as to improve the pressure-feed efficiency of a trochoidal pump, by correcting a theoretical tooth profile of the outer rotor of the trochoidal pump as much as the specified quantity. CONSTITUTION:Mechanical data of a trochoidal pump are set to a base circle radius AO, a rolling circle radius BO, an eccentric value e, a describing circle radius CO, a tooth number n = AO/BO. On the other hand, mechanical data of an outer rotor are set to a line circle center circle radius DO = AO + BO, a line circle radius CO and a tooth number n + 1, but in this pump, a curve of the outer rotor is corrected with a point 1 retracting a fundamental correction value setting clearance DELTAX from the said curve of the out rotor on an axis passing a center O1 of the out rotor and a line circle center O2, and a circular arc passing points P2 and P3 retracting DELTAX/2 from the said curve passing the line circle center O2 and tilted as far as an angle alpha to be given sinalpha = e/BO from the said axis.