Patent ID: 6962088
Filing Date: 2005-11-08
Classification: F16H,G01L

Abstract:
1. A torque detection device for a wave gearing, which device detects torque transmitted through a flexible external gear of the wave gearing, the device comprising: a composite strain gauge unit mounted on a surface of the flexible external gear and having a first strain gauge unit formed with a first detection segment and a second strain gauge unit formed with a second detection segment, the first and second detection segments respectively have a circular arc shape of 360 degrees and are formed to have a grid pattern formed by portions of the resistance wire arranged at regular intervals, the grid pattern of the resistance wire for the first detection segment has portions arranged at equal intervals and along a direction inclined by 45 degrees with respect to a tangential direction of the circular arc shape, the grid pattern of the resistance wire for the second detection segment has portions arranged at equal intervals and along a direction inclined by 45 degrees with respect to a tangential direction of the circular arc shape, and the first and second stain gauge units are superposed together so that the first and second detection segments are arranged concentrically and that said portions of the respective grid patterns thereof face and intersect perpendicular with each other.