The present invention pertains to a friction transmission belt that includes a core cable. The core cable includes a cord comprising: a core yarn containing high elastic-modulus fibers; and a plurality of sheath yarns that are disposed around the core yarn and that contain low elastic-modulus fibers. The cord is twisted and the proportion of the average diameter of the sheath yarn to the average diameter of the core yarn is 0.2 to 0.4.

The present invention pertains to a friction transmission belt that includes a core cable. The core cable includes a cord comprising: a core yarn containing high elastic-modulus fibers; and a plurality of sheath yarns that are disposed around the core yarn and that contain low elastic-modulus fibers. The cord is twisted and the proportion of the average diameter of the sheath yarn to the average diameter of the core yarn is 0.2 to 0.4.

A belt for drive systems includes: an elastic and flame-retardant belt body made from a polymeric material and at least one flame retardant additive, the belt body having a cover layer as a belt back and a substructure which has a force transmission zone; and a tension member embedded in the belt body, wherein the belt body is partially or completely provided with a coating, which coating is single- or multi-layered.

A belt for drive systems includes: an elastic and flame-retardant belt body made from a polymeric material and at least one flame retardant additive, the belt body having a cover layer as a belt back and a substructure which has a force transmission zone; and a tension member embedded in the belt body, wherein the belt body is partially or completely provided with a coating, which coating is single- or multi-layered.

An endless flat belt includes an inner rubber layer 1, a cord core 11 buried in the inner rubber layer 1 and spirally wound at a predetermined pitch in a width direction of the belt, and a reinforcement fabric 2 stuck to the inner rubber layer 1. The cord core comprises polyamide fiber. Opposite ends of the reinforcement fabric 2 are connected with each other into an endless form by adhesion or sewing. A surface rubber layer 3 is stuck to a surface of the reinforcement fabric 2 which is opposite a surface thereof stuck to the inner rubber layer 1.

An endless flat belt includes an inner rubber layer 1, a cord core 11 buried in the inner rubber layer 1 and spirally wound at a predetermined pitch in a width direction of the belt, and a reinforcement fabric 2 stuck to the inner rubber layer 1. The cord core comprises polyamide fiber. Opposite ends of the reinforcement fabric 2 are connected with each other into an endless form by adhesion or sewing. A surface rubber layer 3 is stuck to a surface of the reinforcement fabric 2 which is opposite a surface thereof stuck to the inner rubber layer 1.

A pulley contacting portion of a friction transmission belt is made of a rubber composition containing an EPDM mixture as a rubber component. The EPDM mixture as the rubber component includes a first EPDM with an ethylene content of 67% by mass or more and a second EPDM with an ethylene content of 57% by mass or less. A content of the second EPDM in the EPDM mixture is larger than a content of the first EPDM in the EPDM mixture. An average ethylene content of the EPDM mixture is 54% by mass or more and 59% by mass or less.

A frictional power transmission belt includes a tension layer forming a belt back surface, a compression rubber layer to be in contact with a pulley and frictionally engaged with the pulley, and a tension member embedded between the tension layer and the compression rubber layer along a belt length direction. The compression rubber layer has a surface to be in contact with the pulley. At least a part of the surface is coated with a fiber layer via a fiber/resin mixture layer. The fiber/resin mixture layer contains a resin component and heat-resistant fibers having a softening point or a melting point higher than a vulcanization temperature of a rubber forming the compression rubber layer. The fiber layer contains hydrophilic heat-resistant fibers having a softening point or a melting point higher than the vulcanization temperature and does not contain a resin component.

A rubber toothed belt includes a belt main body including a plurality of tooth portions provided at predetermined intervals along a longitudinal direction of the belt and including a first rubber composition, in which the first rubber composition includes a composite polymer including a hydrogenated nitrile rubber and an unsaturated carboxylic acid metal salt in a mass ratio of the former/the later=100/80 to 100/180, and includes, with respect to 100 parts by mass of the composite polymer, 3 parts by mass to 50 parts by mass of a zinc oxide, 3 parts by mass to 50 parts by mass of a non-reinforcing filler, 10 parts by mass or less of a reinforcing filler, 5 parts by mass or less of short fibers, and 1 part by mass to 5 parts by mass of an organic peroxide.

A rubber toothed belt includes a belt main body including a plurality of tooth portions provided at predetermined intervals along a longitudinal direction of the belt and including a first rubber composition, in which the first rubber composition includes a composite polymer including a hydrogenated nitrile rubber and an unsaturated carboxylic acid metal salt in a mass ratio of the former/the later=100/80 to 100/180, and includes, with respect to 100 parts by mass of the composite polymer, 3 parts by mass to 50 parts by mass of a zinc oxide, 3 parts by mass to 50 parts by mass of a non-reinforcing filler, 10 parts by mass or less of a reinforcing filler, 5 parts by mass or less of short fibers, and 1 part by mass to 5 parts by mass of an organic peroxide.