| 摘要 |
PROBLEM TO BE SOLVED: To provide practical constitution of high detection precision for detecting torque of a rotary body. SOLUTION: A detecting ring 2 of which the both ends 21, 22 are pressure- contact-fixed to the rotary body 81 is fitted with the rotary body 81 for transmitting the detected torque, and a torsion equivalent to a torsion of the rotary body 81 is accurately produced in non-fixed part 23 contactless with the rotary body 81. A large number of slender grooves are formed along a circumferential direction of the detecting ring 2 in the non-fixed part 23, and the grooves are arranged in an axial direction of the detecting ring 2 to form two kinds of grooves tilted at 45 deg. with respect to the axial direction of the detecting ring 2 and grooves tilted at 40 deg. in an opposite side thereof. A longitudinal-directional groove direction is conformed with a direction of a shearing strain by the torsion of detecting ring 2 in one-side grooves and made orthogonal thereto in the other-side grooves, a boundary part 24 in the two kinds of grooves is displaced axis-directionally in response to a level of the torque, and a torque sensor 3 is used as a sensor for detecting the displacement to widen selection ranges for a material of the detecting ring 2 and a type of the torque sensor 3.
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