Dual Torque Sensing in Angle-Gear Screw Tightening Tools

The torque monitoring function is segmented into two separate measurement points: a back torque transducer measuring torque before the angle gear and a front torque transducer measuring torque after the angle gear. This segmentation allows the system to capture torque variations at different stages, enabling more accurate compensation for gear ripple effects and friction variations, thereby improving overall measurement precision without requiring a single complex transducer

The system implements feedback by continuously monitoring torque at both the back and front of the angle gear. By comparing the torque values before and after the gear, the system can detect changes in friction conditions and gear ripple patterns in real-time. This feedback mechanism allows the system to adapt to changing joint conditions and maintain reliable torque monitoring without requiring complex pre-programmed friction models

The system performs preliminary characterization of the angle gear by measuring torque variations at multiple points during the tightening process. By establishing a baseline profile of gear ripple behavior before extensive use, the system can later detect deviations from this profile that indicate tool degradation. This preliminary action enables the system to maintain accurate torque delivery by compensating for gear ripple effects even as the tool accumulates usage hours