Patent ID: 7954389

Claim:
A torque sensor comprising: a housing having an inner peripheral surface; a torsion bar inserted into the housing, the torsion bar having a rotation axis; a magnetic force generating part which rotates together with an end of the torsion bar while generating a magnetic flux in a direction of the rotation axis; a rotating magnetic circuit which rotates together with another end of the torsion bar; an annular groove formed on the inner peripheral surface of the housing to surround the rotating magnetic circuit; a magnetic collecting ring fitted into the annular groove, the rotating magnetic circuit transmitting the magnetic flux generated by the magnetic force generating part to the magnetic collecting ring in accordance with relative rotation positions of the magnetic force generating part and the rotating magnetic circuit; a staking part formed on the inner peripheral surface of the housing in the vicinity of the annular groove so as to fix the magnetic collecting ring into the annular groove; and a magnetic sensor which detects a magnetic flux density in the magnetic collecting ring.