| 摘要 |
PURPOSE:To make it possible to detect the magnitude and direction of the torque transmitted to a rotary shaft in a non-contact state, by converting the distortion of torque to displacement in one direction by fixing a magnetostriction alloy to the side surface of a rod-shaped beam to be used. CONSTITUTION:When right-hand distortion torque is applied to a torque transmission shaft 1, the fixing part 3 of a beam is upwardly moved and the fixing part 4 thereof is downwardly moved with the application of said torque. As a result, the length l of the beam is elongated to l' and tensile stress acts on the amorphous alloy mounted to the beam. The amorphous alloy on which said stress acts is reduced in magnetic permeability and the inductance value of a coil is also lowered. When left-hand distorsion torque is applied, the fixing part 3 is downwardly moved and the fixing part 4 is upwardly moved and the length l of the beam is contracted to l''. At this time, the force acting on the amorphous alloy is a compression force and the reduction in the inductance value of the coil is small. If the amorphous alloy is preliminarily mounted to a center impeller type beam 2 in such a state that the right-hand distortion torque was preliminarily applied to the transmission shaft 1, the magnitude and direction of torque can be detected simultaneously.
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