Torque measuring device for rotating body

A torque measuring device for a rotating body, comprising:

• a rotary section composed of a first flange to be joined to a driving shaft powered, a second flange to be joined to a driven shaft loaded, and a cylinder having a hollow and having the first and second flanges formed respectively on both edges thereof;
• a plurality of torque detectors provided at an inner circumference of the cylinder;
• at least one light emitting element provided at an outer circumference of the rotary section and adapted to emit light according to an output from the torque detectors thereby generating an optical signal;
• a light receiving fiber disposed outside the rotary section and adapted to receive the optical signal from the light emitting element;
• and
• a rotary transformer composed of a primary coil constituted by an annulus which is disposed to surround the rotary section and which is of two-part separable structure and a secondary coil provided at the outer circumference of the rotary section, the rotary transformer being adapted to supply electrical power to the rotary section.