Patent ID: 8584533
Filing Date: 2013-11-19
Classification: G01L,Y10T

Abstract:
1. A magnetostrictive torque sensor device which detects a torque applied to a rotary shaft, comprising: a magnetostrictive portion provided on a surface of the rotary shaft; a coil comprising: a bobbin arranged in outer periphery of the magnetostrictive portion; and a wire wound around the bobbin; a cylindrical back-yoke disposed in outer periphery of the coil, wherein a slit extending in an axial direction is provided on the back-yoke; and a pair of yoke rings, having no slit, disposed at both axial ends of the back-yoke, wherein the back-yoke and the yoke rings are disposed with a gap so as not to contact with each other, and the yoke rings are formed by an annular plate member.