| 摘要 |
In some technical problems, such as, for example, torque wrenches with a ratchet head or an interchangeable tool part, the torque must be measured outside the centre of rotation. Arising at the measuring point is a torque which is dependent upon the length of the lever arm and contains a systematic error which is dependent upon the transverse force, that is, the length of the lever arm, is normally taken into account in the calibration and requires a defined force-inducing point to be maintained. If a different force-inducing point is chosen in practical application, for example by the use of an extension, a considerable measuring error can result. The aim of the present invention is to arrange the geometry of the measuring point in such a way that the transverse force is also detected without an additional measuring point and thus the measuring error can be corrected. This aim is achieved according to the invention owing to the fact that the lever arm has a section of lower rigidity against stressing by transverse force, which section is located in the area of the measuring point and its surroundings, and that the elastic deformation in this section caused by transverse force is also detected by the measurement transducer for the torque, and this deformation signal is superimposed on the signal originating from the torque acting on the measuring point, and that these two signals indicate the actual torque at the tool head. <IMAGE>
|
