Torque detection device and electric power steering apparatus using the same

A torque detection device comprising:

• a magnetic flux collecting ring, arranged outside an outer periphery of a magnetic circuit forming member provided in a rotating body applied with a torque, for collecting a magnetic flux generated by the magnetic circuit forming member;
• a detector for detecting the torque applied to the rotating body based on a density of the magnetic flux collected by the magnetic flux collecting ring;
• and
• a holding ring for holding the magnetic flux collecting ring and the detector and including an attachment part to be attached to a stationary object on an outer periphery;
• wherein
• the holding ring includes an attachment-preventing convex part for preventing attachment to the stationary object by contacting the stationary object on one end face in an axis line direction.

A torque detection device comprising:

• a magnetic flux collecting ring, arranged outside an outer periphery of a magnetic circuit forming member provided in a rotating body applied with a torque, for collecting the magnetic flux generated by the magnetic circuit forming member;
• a detector for detecting the torque applied to the rotating body based on a density of the magnetic flux collected by the magnetic flux collecting ring;
• and
• a holding ring for holding the magnetic flux collecting ring and the detector and including an attachment part to be attached to a stationary object on an outer periphery;
• wherein
• the holding ring is symmetric in an axis line direction with a middle in the axis line direction as a center.