Patent ID: 7614488

Claim:
A retroaction-protected transmission module for a motor for driving of a retroaction-endangered load, wherein during an emergency stop of the load, a large external torque is generated by inertial force and must be absorbed rapidly, the module comprising a transmission having a drive side and an output side and a blocking clutch having a clutch state and a blocking state, wherein the blocking clutch includes a driveshaft, having at one end thereof driver parts, between which clamping bodies are movably located, the clamping bodies surrounding a head of an output shaft, the head of the output shaft has coupling faces, wherein, in the clutch state, the clamping bodies are in contact with the driver parts and with the coupling faces of the output shaft, whereby, in the clutch state, the clamping bodies carried by the driver parts are configured to transmit a torque from the driveshaft to the output shaft-during rotation of the driveshaft, a braking ring having a clamping face is arranged around the clamping bodies, the clamping bodies being pressed by the coupling faces in the blocking state against the clamping face when an external torque acts on the output shaft, the blocking clutch is arranged on the output side of the transmission so that an external torque is absorbed by the blocking clutch whereby the transmission is protected from the effect of the external torque, and the clamping bodies and the coupling faces are shaped so that, in the blocking state, a tangent in a contact point A between one of the coupling faces and the adjoining clamping body and a tangent in a contact point C between this clamping body and the clamping face enclose an angle β of at least 5.7°.