Patent ID: 8544313

Claim:
A rotary-angle and rotary-torque sensing device comprising: a first rotator rotating together with a steering shaft; a second rotator rigidly mounted to the first rotator via a coupler; a rotary torque sensor for sensing rotary torque generated between the first rotator and the second rotator; a first sensor rotating together with the first rotator; a second sensor rotating together with the second rotator; a rotary angle sensor for sensing rotary angles of the first sensor and the second sensor; and a controller coupled to the rotary torque sensor and the rotary angle sensor, wherein the rotary torque sensor further comprises: a first magnet disposed to the first rotator, shaped like a cylinder and formed of multiple poles arranged and magnetized such that different poles are placed adjoiningly to each other at intervals of a predetermined angle; a first ferromagnetic body shaped like a ring and disposed such that an inner wall of the first ferromagnetic body confronts the first magnet; a second ferromagnetic body shaped like a ring and disposed such that an inner wall of the second ferromagnetic body confronts the first magnet with a gap formed between the second ferromagnetic body and the first ferromagnetic body; a third ferromagnetic body disposed to the second rotator and placed between an outer wall of the first magnet and the inner walls of the first and second ferromagnetic bodies; and a first magnetic sensing element disposed in the gap formed between the first ferromagnetic body and the second ferromagnetic body, and wherein the controller detects rotary torque of the steering shaft by using the rotary torque sensor and the rotary angle sensor.