Patent ID: 6487925
Filing Date: 2002-12-03
Classification: C23G,F16H,Y10T

Abstract:
An arrangement for the torque-free shifting of gears in a drive assembly with a mechanical gearbox, comprising:a gearbox having a plurality of gears for changing the transmission ratio for a number of revolutions at an input drive shaft of the gearbox and an output drive shaft of the gearbox; a controllable gearshift for actuating the gearbox and engaging the different gears; a gear control unit, responsive to variable input control signals, for activating the gearshift; and at least one inductive torque sensor installed near a surface of a drive shaft for the drive assembly, and which includes at least one exciter coil for the induction of a magnetic alternating field in the drive shaft of drive assembly, and at least two sensor coils, with one sensor coil being positioned to detect the magnetic field induced in the shaft in a compression stress direction and the other sensor coil being positioned to detect the magnetic field induced in the shaft in a tensile stress direction, with the two sensor coils being connected in a difference circuit that supplies a difference signal as an output measuring signal for the torque sensor, which measuring signal is fed to the gear control unit as an input variable control signal for the gear control unit, which detects a zero passage of the difference signal as a possible moment for a torque-free shifting of gears and wherein several torque sensors are installed near the shaft surface of at least one shaft of the drive assembly.