TIGHTENING TORQUE MEASURING APPARATUS

PROBLEM TO BE SOLVED: To provide a tightening torque measuring apparatus which measures tightening torque by an oil pulse wrench with high precision by a simple structure. SOLUTION: The tightening torque measuring apparatus comprises a rotating shaft 20 and a nut 40, which are threadedly engaged with each other and relatively rotate in response to the tightening torque by the oil pulse wrench, a coil spring 30 for applying an elastic force to the nut 40 in accordance with the relative displacement of the rotating shaft 20 and the nut 40 in the axial direction, and a measuring section 60 for measuring the tightening torque on the basis of the relative rotation angle of the rotating shaft 20 with respect to the nut 40. The nut 40 can change the relative displacement with respect to the rotating shaft 20 in the axial direction without being relatively rotated with respect to the coil spring 30. COPYRIGHT: (C)2007,JPO&INPIT