To provide a structure that determines axial displacement or axial load based on the phase difference between detection signals of a pair of sensors 5a and 5a, and can reduce axial dimension of a detected face of an encoder 4a using a combination of both sensors 5a and 5a.
The encoder 4a is provided with a pair of cylinder sections 9 and 10 superimposed on each other concentrically in the radial direction. An outer-diameter-side detected face 11 facing a detecting section 17 of one sensor 5a is disposed on the outer peripheral surface of the cylinder section 9 on the radial outside, and an inner-diameter-side detected face 12 facing a detecting section 17 of the other sensor 5a is disposed on the outer peripheral surface of the cylinder section 10 on the radial inside. The tilting direction of the boundary of characteristic variation is made different between the outer-diameter-side detected face 11 and inner-diameter-side detected face 12. Employing such a constitution, the above-mentioned problem is solved.
Takashi Daejeon
Kinzo Koyama
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