TORQUE TRANSMISSION SHAFT AND TORQUE SENSOR USING IT

摘要

PROBLEM TO BE SOLVED: To improve a shape of a torque transmission shaft and durability and strength of a magnetostrictive layer in a magnetostrictive detection body. SOLUTION: In this torque transmission shaft, the surface part of a core material is formed of a material transformed from a non-magnetic or feebly magnetic one into a ferromagnetic one when it is cooled after heated. A ferromagnetic part provided in the torque transmission shaft is formed when the surface part is locally heated and then cooled down.