Tensioning device for flexible driving belts.

摘要

Tensioning device (1) for a flexible beat (2) wound around the pulleys (3-6) of a drive comprising an elastic biasing element (13) and a damping group (12), the former intended for applying a force on the belt according to a predetermined direction to oppose slackenings of the belt, the latter for damping the movements of the belt. The device is characterized by the fact that the biasing element and the damping group constitute a single unit wherein both exert on the belt forces acting at the same time in a predetermined direction to maintain a predetermined tensioning. The biasing element acts independently of the damping group in presence of considerable slackenings of the belt and forms part of the damping group for the thrusts of the belt acting on the device in direction opposite to the predetermined direction. Means (20) for connecting the damping group to the biasing element are provided, said means being formed by an elastic system with reaction according to the predetermined direction.