Patent ID: 7428847
Filing Date: 2008-09-30
Classification: G01L

Abstract:
1. A torque detection device comprising: a magnetic circuit forming member provided at a rotating body to which a torque is applied; a magnetic flux collecting ring for collecting a magnetic flux generated by the magnetic circuit forming member, the magnetic flux collecting ring being located circumferentially of the magnetic circuit forming member; a detection part for detecting, based on a density of the magnetic flux collected by the magnetic flux collecting ring, the torque applied to the rotating body; a holding ring for holding the magnetic flux collecting ring and the detection part, the holding ring having a flange to be attached to an appropriate object; and a sealing ring for sealing between the flange and the object, wherein the holding ring has: a concave portion formed at a region thereof close to the flange; and a prevention wall that is continuous with the flange and brought into contact with an inner circumferential face of the sealing ring so as to prevent the displacement of the sealing ring into the concave portion.