Patent ID: 8161827

Claim:
A torque measuring apparatus comprising: a flexure element including: an inner ring fixed to an output shaft of an actuator or a speed reducer; an outer ring to which the load torque is applied or which outputs the torque; a main flexure part connecting the inner ring and the outer ring, the main flexure part subjected primarily to a displacement along the angular direction according to a torque applied from the load object, and an auxiliary flexure part formed at an end of the main flexure part by a slot disposed in a portion of a circumference of the outer ring, the auxiliary flexure part removing a displacement component of the main flexure part other than the displacement along the angular direction; and at least one pair of strain gauges attached to the main flexure part, wherein the torque is measured based on electric signals outputted from the strain gauges in response to the displacement along the angular direction of the main flexure part.