Methods of manufacturing a belt include, at least, laying up a plurality of cords of a belt build on a mandrel, laying up a tape adhesive on an inner surface of the plurality of cords, laying up a cushion layer on an opposing side of the tape adhesive, and vulcanizing the belt build in a profile-forming mold, where the tape adhesive is a vulcanizable rubber which is devoid carbon black. The methods may further include laying up an outer tape adhesive before the laying up of the plurality of cords, and in some aspects, tension layer is laid up before laying up the outer tape adhesive. In some other methods, the tension layer is laid up before the laying up of the plurality of cords. The methods may further include partially or fully wrapping the belt with a belt wrap prior to vulcanizing the belt.

A production method for producing a frictional power transmission belt containing an extensible layer forming a belt back surface, a compressive rubber layer formed on one surface of the extensible layer and frictionally engaging at the lateral surface thereof with pulleys, and a tension member embedded between the extensible layer and the compressive rubber layer along the belt length direction. A surface of at least a part of the compressive rubber layer to be in contact with pulleys is coated with a fiber/resin mixture layer that contains a resin component and heat-resistant fibers having a softening point or a melting point higher than a vulcanization temperature in a mixed state, and the heat-resistant fibers contain a fiber embedded so as to extend from the fiber/resin mixture layer to the compressive rubber layer.

At least part of a belt body of a transmission belt contacting a cord is made of a rubber composition containing ethylene--olefin elastomer as a rubber component and formed in such a manner that the rubber component is mixed with ,-unsaturated fatty acid metallic salt and then is crosslinked using sulfur.

The present invention relates to a frictional power transmission belt containing an extensible layer forming a belt back surface, a compressive rubber layer formed on one surface of the extensible layer and frictionally engaging at the lateral surface thereof with pulleys, and a tension member embedded between the extensible layer and the compressive rubber layer along the belt length direction, in which a surface of at least a part of the compressive rubber layer to be in contact with pulleys is coated with a fiber/resin mixture layer that contains a resin component and heat-resistant fibers having a softening point or a melting point higher than a vulcanization temperature in a mixed state, and the heat-resistant fibers contain a fiber embedded so as to extend from the fiber/resin mixture layer to the compressive rubber layer.

A power transmission belt includes a transparent or semitransparent sheet material covering a portion of a surface of a belt body including a mark. At least a portion of the belt body covered with the sheet material is made of a rubber composition vulcanized with sulfur. The sheet material is made of a rubber material containing a diene rubber. The sheet material is vulcanized with sulfur together with the rubber composition forming the portion of the belt body covered with the sheet material such that the sheet material is connected to the belt body.

A frictional transmission belt according to the present disclosure has a belt body wound around a pulley to transmit power. The belt includes a water absorptive fabric covering at least one side of the belt body that contacts with the pulley.

A friction transmission belt includes a belt body looped over a pulley, and transmitting power. The belt body includes a rubber composition in which at least one of montmorillonite and magnesium carbonate is mixed. The friction transmission belt includes a fabric layer coating at least a surface, of the belt body, making contact with the pulley. The fabric layer has a portion making contact with at least one of the montmorillonite and the magnesium carbonate mixed into the rubber composition.

A friction transmission belt includes a compression layer forming a pulley contact portion, the compression layer includes an inner layer formed from a rubber composition and an outer layer provided on a pulley contact side of the inner layer and formed from a fiber member, and a ratio (M10 modulus/M50 modulus) of an modulus at 10% elongation in a belt longitudinal direction (M10 modulus) to an modulus at 50% elongation in the belt longitudinal direction (M50 modulus), of the rubber composition, is not less than 1.5.

A frictional power-transmission belt having a frictional power-transmission surface covered with a composite fiber layer, in which the composite fiber layer includes a fiber member and an isocyanate compound, and the fiber member includes a cellulose-based fiber. In the frictional power-transmission belt, the isocyanate compound may have a proportion of 3 to 20 mass % in the composite fiber layer.

The invention relates to an apparatus for manufacturing at least one drive belt, comprising a tubular shaping body having a first inner cavity which extends in the longitudinal direction of the shaping body over the entire or predominant length of the shaping body and is surrounded circumferentially by a wall of the shaping body, wherein the inner side of the wall of the shaping body facing the first inner cavity has a shaping surface for abutment and shaping of the drive belt to be produced during the manufacturing process. The invention also relates to a method of manufacturing at least one such drive belt by means of such an apparatus.