| 摘要 |
PURPOSE:To widen a range wherein residual stress becomes constant and to improve sensor characteristics by performing shot peening plural times on the surface of the shaft material of the sensor shaft while a shot is reduced in diameter gradually from a large diameter. CONSTITUTION:The shot peening is carried out by using small-diameter shot grains after large-diameter shot grains to form a surface-compressed hardened layer. Consequently, maximum residual stress is obtained, and a nearly constant range is wide and extends to nearby the surface of the shaft. Consequently, wide excitation conditions can be employed as compared with the use of short grains of single grain size, the use range of a torque sensor is widened, and the sensor characteristics are improved.
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