| 摘要 |
PROBLEM TO BE SOLVED: To form both of magnetostrictive film and pinion by each of optimum machining in relation to a torque transmission shaft, and to enhance stability of a magnetostrictive characteristic of the magnetostrictive film. SOLUTION: This electric power steering device 10 has a constitution to steer steered wheels 31 by transmitting steering torque to steer a steering wheel 21 to a rack shaft 26 via the torque transmission shaft 24 and a rack and pinion 25. The device 10 is provided with a magnetostrictive type torque sensor 41 for detecting the steering torque transmitted to the torque transmission shaft 24. The torque transmission shaft 24 is constituted of a torque side shaft 61 formed with the magnetostrictive film of the magnetostrictive type torque sensor 41 on an outer peripheral surface and a pinion shaft 62 formed with the pinion 32 of the rack and pinion 25. The torque side shaft 61 and the pinion shaft 62 are constituted of separate members connected to each other. COPYRIGHT: (C)2007,JPO&INPIT |
