MANUFACTURING METHOD FOR MAGNETOSTRICTIVE TORQUE SENSOR, AND MOTOR-DRIVEN POWER STEERING DEVICE MOUNTED WITH MAGNETOSTRICTIVE TORQUE SENSOR

Japanese Patent JP3730234

B2

PROBLEM TO BE SOLVED: To provide a manufacturing method for a magnetostrictive sensor capable of keeping favorably a steering feeling for a motor-driven power steering without changing a characteristic of an detection output even when exposed to a high temperature atmosphere such as that in an engine room of an automobile, for a long period, and a motor-driven power steering device mounted with the magnetostrictive sensor manufactured by the manufacturing method.
SOLUTION: In this manufacturing method, the change in the detection output is eliminated to detect a steering torque stably without creeping by exposure to the high temperature atmosphere in use, since a steering shaft 12b is heat-treated again after providing magnetic anisotropy to magnetostrictive films 20u, 20d by releasing a return torque Tq. The magnetostrictive type sensor is mounted on the motor-driven power steering device 10 to maintain satisfactorily the steering feeling without changing sensitivity of a steering torque sensor even when exposed to the high temperature atmosphere in the engine room for the long period.

JP7028003	Torque transmission device
JP2000310573	ELECTRIC POWER STEERING DEVICE
JP5018667	Rotational torque detector

Yasuo Shimizu
Yoshito Nakamura
Shunichirou Sueyoshi
Mizuho Dohi
Tomohiro Hoshi
Jin Harada

JP2003133478A

December 21, 2005

May 12, 2003

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Honda motor industry stock company

G01L3/10; B62D5/04; (IPC1-7): G01L3/10; B62D5/04

JP2002250662A

Yoichiro Shimoda
Tamiya Hiroshi

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