Tool Tensioning Coupling With Planetary Gear Torque Reduction

A planetary gear transmission is introduced as an intermediary mechanism between the user's manual input and the nut clamping mechanism. The transmission gear unit with planetary gears acts as a mediator that converts small input torque into large output torque, enabling the nut to generate high axial clamping force while the user only needs to apply minimal torque (approximately 2 Nm) through the handwheel.

The invention changes the torque parameter through the planetary gear transmission system. The transmission provides a high gear ratio that transforms the torque parameter from the input side (handwheel) to the output side (nut), allowing the same clamping function to be achieved with dramatically reduced user effort. The slip clutch also dynamically changes the torque transmission parameter by disengaging when the preset clamping force is reached.

The slip clutch mechanism provides feedback control for the clamping force. It is preset to disengage when a specific torque threshold is reached, which corresponds to the optimal clamping force. As the user turns the handwheel, the slip clutch transmits torque to the nut until the preset force is achieved, at which point the slip clutch slips and prevents further torque transmission. This feedback mechanism ensures the tool is securely clamped without applying excessive force that could cause damage.

The slip clutch automatically regulates the clamping force without requiring user intervention or monitoring. Once the preset torque limit is reached, the slip clutch self-activates by slipping, thereby self-regulating the clamping force to prevent damage. This self-service feature eliminates the need for the user to estimate or control the clamping force manually.