System for determining a torque between two rotating members

A system for determining a torque applied between a first rotating member and a second rotating member about an axis of rotation (R), the system comprising:

• a test body having an internal ring secured in rotation to a first coupler for coupling the test body to the first rotating member, and an external ring extending around the internal ring, the external right secured to a second coupling for coupling the test body to the second rotating member, the internal and external rings being concentrically linked around the axis (R) by a deformable structure which is arranged to transmit the torque between the first and second rotating members while enabling an angular displacement between the internal and external rings according to the torque applied between the first and second rotating members;
• two encoders, respectively an internal encoder secured in rotation to the internal ring and an external encoder secured in rotation to the external ring, the internal encoder carrying and internal track and the external encoder each carrying an external track both the interal track and the external track being capable of emitting a periodic signal representative of the rotational displacement of the corresponding internal and external ring;
• a determination device for determining the torque comprising a support carrying an internal sensor and an external sensor, the internal sensor and the external sensor each comprising a pattern of sensitive elements arranged at a reading distance (E) from the internal track or the external track to output a signal representative of the angular position of the corresponding internal and external encoder, the determination device comprising a comparator for comparing the signals outputted by the internal and external sensors to determine an angular offset between the rings which depends on the applied torque;
• a casing in which the test body, the internal and external encoders and the determination device are housed, the casing having an outer wall;
• the system wherein the outer wall has a cavity forming a compartment in which a subplate is fastened, the subplate being associated with the support by use of a setting screw, the rotation of the setting screw inducing a translation of the support relative to the test body to enable setting of the reading distance (E) of the internal and external tracks by the internal and external sensors.