Torque sensor

A torque index sensor comprising:

• a housing;
• a stator mounted at a space inside the housing;
• a magnet arranged inside the stator to rotate with a rotation shaft;
• a PCB (Printed Circuit Board) fixedly mounted inside the housing and mounted with a first magnetic element outputting a magnetization signal in response to rotation of the magnet;
• a first fixing boss and a second fixing boss protrusively formed at the housing;
• and
• an upper collector concentrating a magnetic field and having a peripheral boss-receiving notch and a first through hole, wherein the notch and the first through hole are formed at positions corresponding to those of the first and second fixing bosses, respectively,
• wherein the first fixing boss and the second fixing boss pass through the notch and the first through hole, respectively, and are thermally fused to tightly fix the upper collector at an inner surface of the housing;
• wherein the torque index sensor further comprises a lower collector,
• wherein the upper and lower collectors are vertically and symmetrically mounted at an inner surface of the housing about the first magnetic element,
• wherein the torque index sensor further comprises an index magnet mounted at the rotation shaft under the lower collector,
• wherein the PCB further comprises a second magnetic element detecting the index magnet, and
• wherein a surface of the PCB on which the second magnetic element is mounted is perpendicular to the top surface of the upper collector.