Patent ID: 7293472
Filing Date: 2007-11-13
Classification: G01L

Abstract:
1. A torque detecting apparatus comprising: a cylindrical permanent magnet that rotates integrally with any one of a first shaft and a second shaft connected coaxially with each other; a pair of yoke rings that rotate integrally with the other one of the first shaft and the second shaft within a magnetic field formed by the cylindrical permanent magnet; a pair of flux concentrating rings that surround separately the outside of the yoke rings; and a magnetic sensor arranged between opposing surfaces of flux concentrating sections each provided in each of the flux concentrating rings, wherein on the basis of a density of leakage flux between the flux concentrating sections detected by the magnetic sensor, the apparatus detects a torque applied to the first shaft and the second shaft, and wherein the flux concentrating sections are formed such that a portion on a circumference of each of the flux concentrating rings is raised outward in a radial direction, thereby have a plate shape extending on one side in an axial direction, and thereby oppose to each other in a circumferential direction with a predetermined gap in between.