Mechanically damped belt tensioner for tensioning belt drive of combustion engine, has driver- and counter contours engaged with one another with two circumferentially-displaceable end surfaces that point into same rotation direction

摘要

The tensioner (1) has a helical spring clamped in a rotation direction between a base part (2) and a clamping part (3). A friction element comprises an outer jacket surface starting against an inner jacket surface of the base part or the clamping part to attenuate a twist movement of the clamping part. The friction element is in a positive non rotating intervention with a counter-contour at the clamping part or at the base part by a driver contour. The contours are engaged with one another with two circumferentially-displaceable end surfaces pointing into a same rotation direction. The driver contour is provided in form of a radially inwardly directed projection. The clamping part is provided in form of a tensioning lever. The contours are formed as rib profiles such as poly-V profiles.