Measuring device for the determination of the total tightening torque of the head friction torque, and the prestressing force of a tightened screw connection

摘要

A measuring device according to the invention for the determination of the total tightening torque m φ a φ, of the head of the divider driver torque m φ k φ and the prestressing force f φ v φ a tightened and in a force / moment - sensor (1) which is attached to the screw connection by measuring the resulting stresses by means of a strain gauge (40, 50, 50a, 60) which, at the force / moment - sensor (1) are arranged in such a way that they in each case at least one measuring point (4, 5, 5a, 6) for the determination of m φ a φ, m φ k φ or φ φ v f forms dependent voltages, is characterized in that the measuring point (5, 5a) for the shifting from the top driver torque m φ k φ is a function of the torsional stress and / or bending stress by mechanical means (17, 18) of an influence of the of the axial biasing force f φ v φ dependent compressive stress is decoupled. As a result, in an advantageous manner, a crosstalk of a measured variable in the measuring point of the respective other measured quantity, to this extent, prevented and that an increased measurement accuracy can be achieved, by means of which, on the one hand, the head of the divider driver torque m φ k φ can be determined more precisely and, on the other hand, a more secure statement about the quality and reliability of the screw connection is made possible. Dollars a the invention is preferably suitable for use in the quality assurance, in particular in the automobile industry. By means of screw moments of self-locking nuts are a further field of application, as well as conformance testing and research and development.