| 摘要 |
PURPOSE:To aim at enhancing the hardness and strength of tooth surfaces by plating a metal which may restrain nitriding, on the outer surface of a steel material, and by heating and nitriding the steel material to increase the surface hardness thereof after gear cutting while a gear member whose plated layer has been softened is fitted on a support base member. CONSTITUTION:In a gear fitting member (rotor) 1, a gear member (internal gear) 2 is fitted and fixed on a support member (rotor base member) 3, and is plated on the outer surface of a ring-like steel material 5 with copper or nickel so as to form a plated layer 6 thereon. Further, the gear member 2 is subjected to gear cutting so as to form internal tooth part 2a in the inner peripheral section thereof, and the plated layer 6 is removed from the cut tooth surfaces so as to expose the steel material 5 which is then subjected to soft nitriding treatment. Thereafter the outer peripheral part and one side surface of the gear member 2 are press-fitted into a fitting recess 3a in the side surface of the support member 3 on the inner peripheral side, and both members 2, 3 are fastened together by spring pins 4 which are fitted in pin holes 2b that are formed in the gear member 2 and the support member 3, piercing both of them, at equal intervals. |
