| CPC B05D 1/322 (2013.01) [B05D 3/06 (2013.01); F04C 2/103 (2013.01); F04C 2230/91 (2013.01); F04C 2240/20 (2013.01)] | 9 Claims |
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1. A crosslinked fluororesin-coated rotor manufacturing method for manufacturing an annular outer rotor of an internal gear pump including the outer rotor having an inner peripheral surface forming a plurality of internal teeth, and side surfaces orthogonal to an axial direction, and an inner rotor having an outer peripheral surface forming a plurality of external teeth which mesh with the internal teeth, and configured to rotate about a position eccentric from a center of the outer rotor on a radially inner side of the outer rotor,
wherein the side surfaces of the outer rotor are coated with a crosslinked fluororesin, and the inner peripheral surface of the outer rotor is not coated with the crosslinked fluororesin, the method comprising the steps of:
using an outer masking jig for covering the inner peripheral surface in a state where the side surfaces of the outer rotor are exposed, the outer masking jig including a positioning fitting tooth portion for positioning the outer masking jig with respect to the outer rotor in a circumferential direction by fitting to the inner peripheral surface of the outer rotor;
coating the outer rotor with an uncrosslinked fluororesin in a state where the outer masking jig is mounted to the outer rotor; and
then irradiating the fluororesin with radiation in a state where the outer masking jig is removed from the outer rotor, to crosslink the fluororesin.
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