Power transmission shaft
AssigneeNtn Corporation
InventorsKazuhiko Yoshida, Hiroaki Makino, Akira Wakita
Life of this patent
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Abstract
The power transmission shaft 12 is made by applying induction hardening to carbon steel with hardening ratio in a range from 0.25 to 0.50. For the carbon steel, one containing 0.39 to 0.49% of C, 0.4 to 1.5% of Si, 0.4 to 1.0% of Mn, 0.025% or less S, 0.02% or less P and 0.01 to 0.1% of Al by weight as the basic components, with the rest comprising Fe and inevitable impurities is used. This makes it possible to achieve higher strength and lighter weight of the power transmission shaft.
Claims7
A power transmission shaft used in a constant velocity joint, having a spline or serration and made by applying induction hardening to a carbon steel with hardening ratio in a range from 0.25 to 0.50, the carbon steel containing 0.39 to 0.49% of C, 0.4 to 1.5% of Si, 0.4 to 1.0% of Mn, 0.025% or less S, 0.02% or less P and 0.01 to 0.1% of Al by weight as basic components, with the rest comprising Fe and inevitable impurities.
Dependencies are inferred from the claim text.