CONTACTLESS TORQUE SENSOR FOR STEERING MECHANISM

The present invention relates to a contactless torque sensor for a steering system which is installed between an input shaft connected to the steering wheel of the vehicle and an output shaft connected to the wheels of the vehicle and detects torsion generated by rotational manipulation of the steering wheel. The torque sensor comprises: a magnetism generation unit which is coupled with the input shaft wherein plural north pole and south pole magnets are arranged alternately along the outer circumference thereof to have the same distance from the center, a cylindrical magnetic shielding unit which is connected to the output shaft and comprises plural holes respectively placed in the plural north pole and south pole areas, a magnetic detection unit which is distanced from the outer circumference of the magnetic shielding unit and detects magnetism passing through the plural holes, and a magnetic detection sensor which is placed on the outer circumference of the magnetic detection unit and detects relative torsion variation of the magnetism generation unit and magnetic shielding unit. Therefore, without inducing the magnetism twice, the present invention can detect degree of torque of the output shaft with magnetism induced once.