CORRECTION METHOD FOR INNER ROTOR CURVE OF INTERNAL GEAR PUMP MESHED IN TROCHOID

摘要

PURPOSE:To reduce the gap generated during the revolution of an inner rotor of an internal gap pump in trochoid meshing, by preparing the inner rotor by using the radius of the fundamental circle, radius of the rolling circle, and the radius of the drawn circle which are corrected from the theoretical curve for the inner rotor under special conditions. CONSTITUTION:A gap is generated between an inner rotor and an outer rotor by retreating the tip part of the inner rotor whose theoretical curve is given by the radius A0 of fundamental circle, radius B0 of rolling circle, amount (e) of essentially, radius C0 of drawn circle, and the number (n) of teeth n=A0/B0, by the fundamental correction amount DELTAX. Setting the retreat amount at this time as the fundamental correction amount DELTAX, the radius A1 of the fundamental circle after correction, radius B1 of the rolling circle and the radius C1 of the drawn circle are obtained according to the equation I, and the inner rotor curve is corrected. When the inner rotor is prepared by using the correc tion value, the pump efficiency can be improved by reducing the amount of gap which is generated during the revolution of the rotor of an internal gear pump meshed in trochoid.