HEAT TREATMENT OF FLYWHEEL

摘要

PURPOSE:To provide excellent wear resistance and high fatigue strength to the ring gear tooth part of a flywheel formed integrally with a body and a ring gear part by subjecting said tooth part to a heat treatment such as high-temp. tempering or the like after high-frequency hardening. CONSTITUTION:A cast iron flywheel formed integrally with a ring gear part and a flywheel body part is subjected to high-frequency heating then to a high-temp. tempering treatment. The flywheel is otherwise subjected to a heat treatment such as force cooling or the like after high-frequency heating. The hardness of the tooth part is adjusted to a 300-500Hv range by such treatments. The flywheel is hardened by said means to the hardening depth distribution deep in the tooth bottom part and shallow in the tooth tip part. Excellent corrosion resistance and high fatigue strength are thus provided in combination or the ring gear tooth part.