Torque Measurement of Heavy Truck Gearbox Input Shaft Using Wireless Telemetry With a Resistance Sensing Model

The oil-seal structure positioned around the gearbox input shaft limits the installation of signal transmission devices for torque measurement. To overcome this limitation, this study proposes a novel torque measurement method and system for determining gearbox input shaft torque using a redesigned oil-seal structure. This system employs two double-shear strain gauges to detect the input shaft deformation resulting from applied torque and transmits the signal based on wireless telemetry. A finite element simulation model was developed to evaluate the mechanical integrity of the redesigned oil-seal structure. The torque measurement accuracy was assessed using a static statistical model. Furthermore, the reliability of the input shaft torque measurement was validated based on the transmission ratio by comparing the torque values of the gearbox input shaft and transmission shaft, yielding an average error of 2.96%. This study offers a technical solution for torque measurement in rotating shafts within constrained spaces where traditional methods are not feasible.