The present invention relates to a wrapped V-belt containing: a belt main body containing a compression layer containing a compression rubber layer and a fabric-laminated body layer, a tension rubber layer and a tension member buried between the compression layer and the tension rubber layer; and an outside cloth that covers a periphery of the belt main body, in which the compression layer has a plurality of notch portions not covered with the outside cloth, and the notch portion has a top disposed in the fabric-laminated body layer.

A synchronous drive belt includes an outer tension section and opposing continuous tooth section defining an outer surface. The synchronous drive belt further includes a cross-linked elastomeric body, and a tensile reinforcement section disposed between the outer tension section and the cross-linked elastomeric body. A fabric reinforcement is disposed inwardly adjacent the outer surface of the continuous tooth section, and the fabric reinforcement is enveloped by the cross-linked elastomeric body. Further, the cross-linked elastomeric body forms the outer surface of the continuous tooth section. In some aspects, the cross-linked elastomeric body contains a urethane material, which may be formed from the reaction product of a polyisocyanate and a hydroxyl functional polyol during a belt molding process. The polyisocyanate and the hydroxyl functional polyol may envelop the fabric reinforcement prior to reacting during the belt molding process, or even while reacting in the molding process.

A synchronous drive belt includes an outer tension section and opposing continuous tooth section defining an outer surface. The synchronous drive belt further includes a cross-linked elastomeric body, and a tensile reinforcement section disposed between the outer tension section and the cross-linked elastomeric body. A fabric reinforcement is disposed inwardly adjacent the outer surface of the continuous tooth section, and the fabric reinforcement is enveloped by the cross-linked elastomeric body. Further, the cross-linked elastomeric body forms the outer surface of the continuous tooth section. In some aspects, the cross-linked elastomeric body contains a urethane material, which may be formed from the reaction product of a polyisocyanate and a hydroxyl functional polyol during a belt molding process. The polyisocyanate and the hydroxyl functional polyol may envelop the fabric reinforcement prior to reacting during the belt molding process, or even while reacting in the molding process.

A power transmission belt includes a compression rubber layer that is provided on an inner circumferential side, a cog portion that is provided in at least the compression rubber layer and has cog ridges and cog valleys alternately arranged along a belt longitudinal direction, and a reinforcing fabric layer that covers a surface of the cog portion. The reinforcing fabric layer includes at least one reinforcing fabric that is bonded to surfaces of the cog ridges and the cog valleys along the belt longitudinal direction and that covers the surface of the cog portion. Both end portions of the reinforcing fabric are joined to each other at only at least one joint portion in the belt longitudinal direction. The joint portion is disposed at only a position corresponding to the cog ridge.

A power transmission belt includes a compression rubber layer that is provided on an inner circumferential side, a cog portion that is provided in at least the compression rubber layer and has cog ridges and cog valleys alternately arranged along a belt longitudinal direction, and a reinforcing fabric layer that covers a surface of the cog portion. The reinforcing fabric layer includes at least one reinforcing fabric that is bonded to surfaces of the cog ridges and the cog valleys along the belt longitudinal direction and that covers the surface of the cog portion. Both end portions of the reinforcing fabric are joined to each other at only at least one joint portion in the belt longitudinal direction. The joint portion is disposed at only a position corresponding to the cog ridge.

A rubber crawler includes: a rubber belt serving as an example of an endless rubber body entrained around plural wheels; plural rubber projections that are formed at the rubber belt at intervals around a crawler peripheral direction of the rubber belt, that project toward an inner peripheral side of the rubber belt, and that limit movement of the wheels in a crawler width direction through contact; and at least one metal member embedded in each rubber projection, the at least one metal member raising a rigidity of the rubber projection in the crawler width direction, and including a portion that is exposed from the rubber projection.

The present invention relates to elastomer toothed belts comprising a fabric spanning the teeth of the toothed belt, wherein the elastomer mixture forming the teeth contains a crosslinked ethylene-propylene rubber (EPM) and/or a crosslinked ethylene-propylene terpolymer rubber (EPDM) accounting for at least 70% by weight of the elastomer mixture based on the polymer proportion and wherein an interlayer is arranged between the fabric and the elastomer mixture forming the teeth which contains at least 70% by weight of hydrogenated acrylonitrile-butadiene rubber (HNBR) based on the polymer proportion of the interlayer. Such elastomer toothed belts are halogen-free and feature improved durability and good low-temperature stability properties. The present invention further relates to processes for producing such elastomer toothed belts and to the use of a layer of hydrogenated acrylonitrile-butadiene rubber (HNBR) in such toothed belts to increase service life, to improve low-temperature stability and to improve the adhesion between the teeth and the fabric.

The present invention relates to elastomer toothed belts comprising a fabric spanning the teeth of the toothed belt, wherein the elastomer mixture forming the teeth contains a crosslinked ethylene-propylene rubber (EPM) and/or a crosslinked ethylene-propylene terpolymer rubber (EPDM) accounting for at least 70% by weight of the elastomer mixture based on the polymer proportion and wherein an interlayer is arranged between the fabric and the elastomer mixture forming the teeth which contains at least 70% by weight of hydrogenated acrylonitrile-butadiene rubber (HNBR) based on the polymer proportion of the interlayer. Such elastomer toothed belts are halogen-free and feature improved durability and good low-temperature stability properties. The present invention further relates to processes for producing such elastomer toothed belts and to the use of a layer of hydrogenated acrylonitrile-butadiene rubber (HNBR) in such toothed belts to increase service life, to improve low-temperature stability and to improve the adhesion between the teeth and the fabric.

The present invention relates to a toothed belt, including: a back portion including a tension member; a plurality of tooth portions; a back rubber layer; and a first rubber layer and a second rubber layer that are formed on a belt inner circumferential side with respect to the tension member, in which an elastic modulus of the first rubber layer is larger than that of the second rubber layer, the first rubber layer includes a first crosslinked rubber composition including a first rubber component and a first short fiber, a proportion of the first short fiber is 5 parts by mass to 60 parts by mass with respect to 100 parts by mass of the first rubber component, the first short fiber is oriented in a belt longitudinal direction along a contour of the tooth portion.

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.