Patent ID: 9091263
Filing Date: 2015-07-28
Classification: F04C,Y10T

Abstract:
1. An internal gear pump wherein a diameter of a base circle is set to A mm, a diameter of a rolling circle is set to B mm, a radius of the rolling circle is set to b mm, a diameter of a locus circle is set to C mm, and an amount of eccentricity is set to e mm, wherein a trochoidal curve (T) is drawn by rolling the rolling circle along the base circle without slipping and by using a locus of a fixed point distant from a center of the rolling circle by e, wherein a tooth profile of an inner rotor having n teeth is formed based on an envelope of a group of the locus circles each having a center on the trochoidal curve (T), wherein a pump rotor is formed by combining the inner rotor with an outer rotor having (n+1) teeth, and wherein a tooth-profile curve of the inner rotor satisfies expression (1): and wherein when a minimum curvature radius ρ