| 摘要 |
PROBLEM TO BE SOLVED: To prolong the life of tools for a plastic working of a helical gear and arrange the axial structure of the stock material along the tooth trace without falling into disorder. SOLUTION: The axial structure in the tooth trace of a helical gear 2b formed by plastic working is made to flow along the twisted angle of the gear without being sheared and the addendum is made smooth and its surface is hardened to be familiar with sliding contact by surface hardening. The helical gear is manufactured through a first process in which a spur gear is formed in the gear-forming section of the stock, a second process in which the tooth are twisted to form a tortional shape along the tortional angle of the helical gear 2b, and a third process in which it is corrected by the plastic processing tools for forming the helical gear 2b.
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