Importance

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Abstract

In a gear product, a plurality of tooth having a crowning formed in a pattern unified to one pattern selected from fourteen patterns comprising four patterns in which a crowning is formed at one of an upper end part A or lower end part B of an upper inclined surface 91, an upper end part C or a lower end part D of a lower inclined surface 92, six patterns in which crownings are formed at two parts thereof and four patterns in which crownings are formed with three parts thereof, are formed at an equal pitch on an outer peripheral surface of a gear part. In a helical gear 9, a combination pattern of an upper part A of an upper side tooth surface 91 and a lower part D of a lower tooth surface 92 or a pair of an upper part C of the lower tooth surface 92 and a lower part D of the upper tooth surface 92 is formed by forging device.

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First Claim