| 摘要 |
PROBLEM TO BE SOLVED: To provide a torque sensor improved in detecting efficiency, having both excellent magnetic and mechanical characteristics required for not only detecting but also transmitting torque, being small in the number of parts, and having excellent precision and sensitivity for detection. SOLUTION: A magnetic flux passing part of a first cylindrical member 11 made of magnetic material where a first shaft 3 is press-fitted is surrounded by a magnetic flux regulating part of a second cylindrical member 12 made of conductive non-magnetic material rotated together with a second shaft 4. A ring-like gapδis formed between an inner periphery of the magnetic flux passing part and an outer periphery of the first shaft 3. An outer periphery of the second cylindrical member 12 is surrounded by coils 33, 34 generating magnetic flux so as to generate alternating field. An overlapped area where openings 41, 42 of the magnetic flux passing part and openings 43, 44 of the magnetic flux regulating part are partially overlapped in the radial direction is changed with relative rotation of the shafts 3, 4. Transmitting torque generated by the shafts 3, 4 is detected based on change of passing magnetic flux in the magnetic flux passing part corresponding to the change of the overlapped area. |
