Abstract: A toothed belt is described, comprising resistant inserts that each have a total diameter, indicated by ?tot, in the range between 0.9 and 3 mm. The resistant insert consist of a core consisting of at least one yarn of fibres of a first material having a diameter ?c and a number N of cover yarns of fibres of a second material. The number of cover yarns N is in the range between 10 and 25 and the N yarns entirely surround the core, moreover the ratios between the total diameter of the resistant insert and the core diameter are in the range 0.4<K<1, where K=?tot/2?(?tot??c)/4.

Abstract: Described herein is a toothed belt comprising: a body made of elastomeric material having teeth on one of its surfaces; a coating fabric adherent to the surface of the teeth; and resistant inserts capable of having a high power of transmission, obtained by means of appropriate selection of parameters. The toothed belt according to the invention comprises a body formed by a mixture with a hardness value, after vulcanization, of between 90 and 97 shoreA, preferably made of chloroprene: the fabric is formed by at least one layer of fibers with a weight of between 700 and 1250 grams per square meter of surface, and preferably is a 6/6 textured polyamide, and the resistant inserts are made of glass fibers with a mean diameter of between 2.4 and 3 mm and are formed starting from basic filaments having a mean diameter of between 6 and 10 ?m, which are preferably formed for at least 75 wt % of basic filaments having a mean diameter of 9 ?m.

Abstract: Described herein is a toothed belt comprising: a body made of elastomeric material having teeth on one of its surfaces; a coating fabric adherent to the surface of the teeth; and resistant inserts capable of having a high power of transmission, obtained by means of appropriate selection of parameters. The toothed belt according to the invention comprises a body formed by a mixture with a hardness value, after vulcanization, of between 90 and 97 shoreA, preferably made of chloroprene: the fabric is formed by at least one layer of fibres with a weight of between 700 and 1250 grams per square metre of surface, and preferably is a 6/6 textured polyamide, and the resistant inserts are made of glass fibres with a mean diameter of between 2.4 and 3 mm and are formed starting from basic filaments having a mean diameter of between 6 and 10 &mgr;m, which are preferably formed for at least 75 wt % of basic filaments having a mean diameter of 9 &mgr;m.

Abstract: In a process for manufacturing toothed belts of any length, a tubular sleeve comprising a layer of cords (1) and at least a layer of elastomeric material (2) is preformed in an autoclave without being vulcanized so as to produce, on the inner surface thereof, a plurality of grooves (5) spaced apart from one another according to a predetermined toothing pitch (P). The sleeve is helically cut to obtain a continuous strip (7) to be subsequently wrapped over two wrapping drums (8, 9) suitably spaced apart from each other depending on the circumferential extension to be given to the belt. The obtained annular element (10), when the wrapping has been completed, is trued up by means of the provided grooves, between a molding matrix (11) and opposite mould (12) and is submitted to a pressing step and simultaneous cross-linking of the elastomeric material (2) by closing said elastomeric material between the molding matrix (11) and opposite mold (12) according to stages in succession.

Abstract: In a process for manufacturing toothed belts of any length, a tubular sleeve comprising a layer of cords (1) and at least a layer of elastomeric material (2) is preformed in an autoclave without being vulcanized so as to produce, on the inner surface thereof, a plurality of grooves (5) spaced apart from one another according to a predetermined toothing pitch (P). The sleeve is helically cut to obtain a continuous strip (7) to be subsequently wrapped over two wrapping drums (8, 9) suitably spaced apart from each other depending on the circumferential extension to be given to the belt. The obtained annular element (10), when the wrapping has been completed, is trued up by means of the provided grooves, between a molding matrix (11) and opposite mould (12) and is submitted to a pressing step and simultaneous cross-linking of the elastomeric material (2) by closing said elastomeric material between the molding matrix (11) and opposite mold (12) according to stages in succession.