Patent ID: 7967585

Claim:
A method for manufacturing a trochoid pump having a crescent, wherein an inner rotor, which comprises an inner rotor tooth profile as a trochoid tooth profile represented by a drawn circle of a predetermined radius, is formed in advance, with a number of teeth of the inner rotor being set to a first predetermined number comprising a number that is equal to or larger than four, in order to manufacture an outer rotor with a second predetermined number comprising said first predetermined number plus a natural number equal to or larger than two of teeth, row circles that are identical to the drawn circle are disposed so as to bring the row circles into contact with a tooth bottomland of the inner rotor tooth profile, the inner rotor tooth profile is rotated by a half of a tooth about a center of the inner rotor and an outer rotor tooth profile is also rotated by a half of a tooth of the second predetermined number of teeth about an appropriate virtual center of the outer rotor including the row circles, an established center is determined by a mathematical expression from the appropriate virtual center at a time at which the row circles assume, in a course of the rotation, a state of being in contact, without penetration or separation, with the tooth bottomland or a tooth tip zone of the inner rotor tooth profile, or from an interval between adjacent row circles at a time at which a contact state is assumed, a reference circle is drawn that comprises a radius from the established center to the row circles and that comprises the total second predetermined number of the equidistantly spaced row circles to form the row circles as outer rotor tooth tips, and the outer rotor tooth profile is manufactured.