Magnetostrictive torque sensor and method for manufacturing magnetostrictive torque sensor

Abstract

A magnetostrictive torque sensor that is configured to be attached around a rotating shaft exhibiting a magnetostrictive effect and detects torque transmitted by the rotating shaft in a predetermined operating temperature range. The magnetostrictive torque sensor is provided with a molded resin body including a cylinder portion with a hollow cavity in a center through which the rotating shaft is inserted, a flexible substrate that is wrapped around an outer circumference of the cylinder portion of the molded resin body and includes a plurality of detection coils composed of a wiring pattern, a cylindrical magnetic ring that houses the flexible substrate between the magnetic ring and the cylinder portion, and a filler composed of a curable resin filled between the cylinder portion, the flexible substrate, and the magnetic ring. A linear expansion coefficient of the molded resin body is higher than a linear expansion coefficient of the magnetic ring, and the filler is cured in a state in which temperatures of the cylinder portion, the flexible substrate, and the magnetic ring are elevated to higher than an upper limit temperature of the operating temperature range.

Dependencies are inferred from the claim text.