MAGNETOSTRICTIVE TORQUE SENSOR AND METHOD FOR MANUFACTURING MAGNETOSTRICTIVE TORQUE SENSOR
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United States of America Patent
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Issued Date -
Jul 25, 2024
app pub date -
Dec 22, 2023
filing date -
Jan 19, 2023
priority date (Note) -
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status (Latency Note)
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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.
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