Apparatus for detecting torque value

An apparatus for detecting torque, comprising:

• a first shaft;
• a second shaft;
• an elastic member coaxially linking the first and second shafts such that the first and second shafts are linked linearly with the elastic member therebetween and the elastic member provides a torsional displacement for detecting the torque, the linearly connected first and second shafts and elastic member having an axial direction along a length-wise direction of the first and second shafts, a radial direction perpendicular to the axial direction, and a circumferential direction around the first and second shafts;
• a magnet attached to the first shaft;
• a pair of magnetic yokes composed of a first magnetic yoke and a second magnetic yoke, the first and second magnetic yokes being fixedly installed on the second shaft, the first and second magnetic yokes being separated from each other in the axial direction;
• and
• a magnetic sensor detecting magnetic flux generated between the first and second magnetic yokes,
• wherein each of the first and second magnetic yokes comprises:
• an opposing portion, the opposing portion being positioned to be opposed to the magnet and displaced relatively to the magnet in the circumferential direction when the elastic member is subjected to a torsional displacement;
• and
• a wall portion, the wall portion of each of the first and second magnetic yokes being separated in the radial direction and positioned outside the opposing portion in the radial direction, the wall portion of one of the first and second magnetic yokes extending towards the wall portion of the other of the first and second magnetic yokes, the magnetic sensor being positioned between the wall portions of the first and second magnetic yokes in the radial direction.