Patent ID: 8562467
Filing Date: 2013-10-22
Classification: F16H

Abstract:
1. Tensioning device for a belt or chain drive, comprising a tensioning lever that is mounted on a base housing so that it can rotate via a drag bearing constructed as a plain bearing, a rotating tensioning roller located at a radial distance from a rotational axis of the drag bearing, a pretensioned helical torsion spring that is arranged coaxial to the drag bearing and connected on a housing side spring end to the base housing and on a lever side spring end to the tensioning lever, wherein the spring is loadable in an opening sense and the lever side spring end is a stub end, and a brake shoe is arranged on the lever side spring end such that the brake shoe is clamped on a peripheral side between the lever side spring end and a radially oriented stop surface of a lever-fixed catch as the spring is loaded in the opening sense, wherein the brake shoe is constructed as a circular ring segment facing away from an outer winding of the lever side spring end on a peripheral side such that an end of the brake shoe close to the lever side spring end on the peripheral side contacts the stub end and an end of the brake shoe away from the lever side spring end on the peripheral side contacts the stop surface of the lever-fixed catch so that the brake shoe is pressable with an outer, cylindrical friction surface essentially in a radial direction against a cylindrical inner wall of the base housing by a contact force resulting from two peripheral-side tangential forces from the helical spring and on the helical spring.