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, at least its surface part is formed of a material transformed from a ferromagnetic one into a non-magnetic or feebly magnetic one when it is cooled after heated. A feebly magnetic part provided in the torque transmission shaft is formed when the surface part is locally heated and then cooled down.