Tensioning device for belts in particular toothed belts

摘要

The tensioning device (1) comprises a support plate (2) attached to a pivot (3) defining a fixed axis (A); an intermediate tubular element (15) accommodating the pivot (3) and able to rotate about the fixed axis; a pulley (4) for a belt (5) and supported by the tubular element (15), surrounding the pivot (3) and able to rotate about an axis of rotation (B) which is not coincident with the fixed axis (A); and an elastic element (27) interposed between the pivot (3) and the intermediate tubular element (15) so as to urge elastically the intermediate tubular element against the belt. To ensure a high degree of perpendicularity between the pivot and the support plate and, therefore, accurate engagement between the tensioning device (1) and the belt (5), the support plate (2) and the pivot (3) are integrally formed. <IMAGE>