Ntn Corporation

Hideki Kondou

Takeshi Ikeda

Kazuhiko Yoshida

Akira Wakita

Hiroaki Makino

A quality control method for a constant velocity universal jointincludes a step of attaching an IC tagto the constant velocity universal joint, a step of recording information in the IC tagabout the constant velocity universal joint, a utilizing step for reading the information recorded in the IC tagat any arbitrarily chosen time. The IC tagis attached to one of elementssuch as an outer race, an inner race, an intermediate shaftand boots, all forming respective parts of the constant velocity universal joint. This IC tagis recorded with information on, for example, the manufacturing step, the identification number, the date of manufacture and/or the place of manufacture with respect to the elementsand the constant velocity universal joint

Constant velocity universal joint and quality control method for the same

A power transmission shaft using the constant velocity joint is manufactured by applying induction hardening to graphite steel thereby to harden the surface layer and form a 2-phase structure of ferrite and martensite in the core thereof. The graphite steel contains 0.35 to 0.70% of C, 0.4 to 2.0% of Si, 0.3 to 1.5% of Mn, 0.025% or less S, 0.02% or less P, 0.01 to 0.1% of Al, 0.001 to 0.004% of B and 0.002 to 0.008% of N by weight as the basic components, with the rest comprising Fe and inevitable impurities.

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Iwata, Japan

Hideki Kondou