Apparatus for the measurement of drive torques

Apparatus for the measurement of the drive torque exerted on a drivable wheel, in particular on the drive wheel of a bicycle, and/or of parameters associated with the drive torque, the apparatus comprising a wheel hub (3) which is rotatably journalled relative to a fixed axle (7);

• a drive axle (1) which is coaxially disposed between the fixed axle (7) and the wheel hub (3);
• a member (18') which permits a relative rotation disposed between the drive axle (1) and the wheel hub (3) at the drive side end;
• a fixed connection (11) formed at the other end between the drive axle (1) and the wheel hub (3);
• a device for detecting the relative rotation between the wheel hub (3) and the drive axle (1) which depends on the drive torque and also for generating signals representative of the relative rotation and suitable for evaluation, characterized in that a carrier element (5) for at least one measurement transducer (8) is provided in a guide space (12) between the fixed axle (7) and the drive axle (1) and is pivotable about the fixed axle (7);
• in that at least one sensor (9) which detects the pivoting of the carrier element (5) is associated with the measurement transducer (8);
• and in that the pivot angle of the carrier element (5) is controlled by a mechanical multiplier member (4) which acts between the wheel hub (3) and the drive axle (1) and is actuated by their relative rotation.