| 摘要 |
PURPOSE:To obtain a sensor, which is characterized by excellent productivity and excellent durability and is not subject to the effect of temperature, by providing a torsion bar in an input shaft, and detecting the change in electromagnetic couplings accompanied by the relative rotation of magnetic cylinders, which are provided on both sides. CONSTITUTION:A torsion bar 1b is provided in the middle of an input shaft 1. Magnetic cylinders 11 and 12 are fixed to one side of the bar 1b. A magnetic cylinder 13 is fixed to the other side. Annular coils 21-23, which are electromagnetically formed with said cylinders, respectively, are fixed at the outer surface sides of the cylinders. The cylinders 12 and 13 have asymmetric shapes with respect to the axial center of the shaft 1. When, rotary torque is applied to an upper shaft part 1a of the shaft 1, the bar 1b is twisted in correspondence with the torque. The cylinder 12 is relatively rotated with respect to the cylinder 13. Then, the electromagnetic coupling with the cylinders are changed in correspondence with the amount of rotation. Since the electromagnetic coupling states of the cylinders 11 and 12 and the coils 21 and 22 are not changed, the applied torque can be detected based on the difference in signals obtained from the coils 21 and 23. The effects of temperature changes are offset since the difference between the coils 21 and 23 is obtained.
|
