Abstract: This helically toothed belt power transmitting device (1) has: a toothed belt (10) having a plurality of teeth (12) tilted relative to the width direction of the belt; a drive pulley; and a driven pulley. The width of the helically toothed belt (10) is 1 mm to 20 mm, inclusive. The core (13) of the toothed belt (10) is a twisted cord containing high-strength glass fibers or carbon fibers and has a diameter of 0.2 mm to 0.9 mm, inclusive. The compressibility of the teeth (12) of the toothed belt (10) compressed by the grooves of the drive pulley and the driven pulley is 0% to 5%, inclusive.

Abstract: A core wire for a power-transmission belt includes a plied twisted cord formed by putting together and secondary twisting a plurality of primary twisted yarns. The primary twisted yarns include a plurality of hard primary twisted yarns (A) and one soft primary twisted yarn (B). The hard primary twisted yarns (A) include an aramid fiber, and a fineness of each hard primary twisted yarn (A) is 1500 dtex or less. The soft primary twisted yarn (B) includes a low elastic modulus fiber. A ratio (B/A) of a primary twist coefficient of the soft primary twisted yarn (B) to an average value of primary twist coefficients of the hard primary twisted yarns (A) is 0.5 to 1.2.

Abstract: The present invention relates to a cogged V-belt, including a cog portion containing cog ridges and cog valleys, and having a belt thickness of 19 to 36 mm and a cog height of 14 to 19 mm, in which the cog valley has a cross-sectional shape including a bottom portion formed by combining a plurality of continuous arcs and side walls of the cog valley, in which the plurality of arcs has curvature radius decreasing as a distance from a deepest portion of the cog valley increases, and includes a first arc passing through the deepest portion of the cog valley, having a diameter larger than a virtual circle tangent to the deepest portion and the both side walls and having a curvature radius of 7 to 10 mm.

Abstract: A method for manufacturing a cogged V-belt having a plurality of cogs, includes: an unvulcanized sleeve formation step of forming an unvulcanized sleeve by laminating a plurality of unvulcanized rubber sheets that contain at least an unvulcanized rubber sheet for a compression rubber layer and an unvulcanized rubber sheet for a tension rubber layer; a vulcanized sleeve formation step of forming a vulcanized sleeve by vulcanizing the unvulcanized sleeve; and a cog formation step of forming the plurality of cogs on the compression rubber layer after the vulcanized sleeve forming step.

Abstract: A rubber composition includes an elastomer component, a polyvinyl pyrrolidone-based resin, and a non-water-absorbent short fiber, and includes substantially no water-absorbent fiber. The elastomer component may include an ethylene-?-olefin elastomer. The polyvinyl pyrrolidone-based resin may have a K value of 10 to 100. The non-water-absorbent short fiber may include an aliphatic polyamide short fiber.

Abstract: This toothed belt transmission device (1) includes a toothed belt (10) in which belt teeth (13) and belt tooth bottom parts (14) are alternately formed, and a toothed pulley (50) in which pulley teeth (53) and pulley tooth bottom parts (54) are alternately formed so as to mesh with the toothed belt (10). The tips of the belt teeth (13) come into contact with the pulley tooth bottom parts (54), but the tips of the pulley teeth (53) do not come into contact with the belt tooth bottom parts (14), and gaps (S) are provided between the tips of the pulley teeth (53) and the belt tooth bottom parts (14).

Abstract: A frictional power transmission belt includes a compression rubber layer that includes a frictional power transmission surface at least a part of which can come into contact with a pulley and that is formed of a cured product of a rubber composition. On a surface of the frictional power transmission surface, a surface layer comprising a cured product of a rubber composition containing a polyvinyl pyrrolidone-based resin and an elastomer component is laminated.

Abstract: The present invention relates to a helical toothed belt including: a back portion in which a tension member is buried; and a plurality of tooth portions, in which: the plurality of tooth portions have a tooth pitch of 2 mm or more and less than 4 mm, in a case where the tooth pitch of the plurality of tooth portions is 2 mm or more and less than 3 mm, the back portion has a thickness of 0.4 mm or more and 1.2 mm or less, in a case where the tooth pitch of the plurality of tooth portions is 3 mm or more and less than 4 mm, the thickness of the back portion is 0.6 mm or more and 1.8 mm or less; and the tension member is a twisted cord including a high-strength glass fiber or a carbon fiber.

Abstract: A pulley structure may be equipped with an outer rotating body, an inner rotating body, and a coil spring. The pulley structure has a cross section of the spring wire of the coil spring along a direction running along the rotational axis and parallel to the rotational axis being a trapezoidal shape, and the length of an inner-diameter-side portion in the rotational axis direction in the cross section being greater than the length of an outer-diameter-side portion in the rotational axis direction in the cross section.

Abstract: A pulley structure includes: a cylindrical outer rotation body; an inner rotation body; and a torsion coil spring. The torsion coil spring includes: one end region which is in contact with one rotation body; the other end region which is in contact with the other rotation body; and a middle region. The other rotation body includes: a first contact surface; a facing surface; an inclined surface; and a second contact surface. The facing surface includes a constraining surface connected to the inclined surface. The constraining surface is configured to be capable of constraining the other end region of the torsion coil spring before press fitting so as to prevent a displacement of an axis of the torsion coil spring before the press fitting with respect to an axis of the other rotation body.

Abstract: The present invention relates to a method of producing a cord for a power transmission belt, the method including: a first treatment step of treating an untreated yarn of a cord for a power transmission belt with a first treatment agent including a resin component (A) to obtain a first treated yarn; and a second treatment step of treating the first treated yarn with a second treatment agent including a condensate (B1) of resorcin and formaldehyde, an unmodified latex (B2), and an acid-modified diene-based polymer (B3) to obtain a second treated yarn.

Abstract: A power transmission V-belt includes a tension member, an adhesion rubber layer in which at least part of the tension member is embedded, and a tension rubber layer and a compression rubber layer stacked via the adhesion rubber layer. A rubber hardness of the tension rubber layer is smaller than a rubber hardness of the compression rubber layer. In the adhesion rubber layer, a rubber hardness on a tension rubber layer side relative to the tension member is smaller than a rubber hardness on a compression rubber layer side.

Abstract: The present invention relates to a twisted cord for constituting a core wire of a power-transmission belt, the twisted cord including a plurality of primary twisted yarns that are bundled and secondarily-twisted, in which when secondary twist is untwisted by 25 cm, a difference in length between the longest primary twisted yarn L and the shortest primary twisted yarn S among the plurality of primary twisted yarns is 1 to 10 mm.

Abstract: A pulley structure includes a cylindrical outer rotation body, an inner rotation body, and a pair of bearings which is disposed between the outer rotation body and the inner rotation body. Of the pair of bearings, one bearing is a sliding bearing, and the other bearing is a rolling bearing. The sliding bearing is made of a thermoplastic resin and is formed into an ended ring shape. A thickness of the sliding bearing at each of both circumferential end portions is smaller than a reference dimension of a thickness of the sliding bearing.

Abstract: An aqueous treatment agent for preparing a cord by treating an untreated yarn for a power transmission belt includes at least a first aqueous treatment agent. The first aqueous treatment agent contains an epoxy resin (A), a polycarbonate polyol (B), and a blocked polyisocyanate (C). The epoxy resin (A) may contain a bisphenol type epoxy resin (A1). The polycarbonate polyol (B) may contain a polycarbonate diol (B1). The blocked polyisocyanate (C) may contain at least one blocked polyisocyanate selected from the group consisting of an aliphatic polyisocyanate or derivatives thereof and an aromatic polyisocyanate and having a dissociation temperature of 120° C. to 180° C.

Abstract: The present invention relates to a V-ribbed belt including: a tension rubber layer made of a vulcanizate of a rubber composition including a rubber component and short fibers; and a core wire, in which a proportion of the short fibers in the rubber composition is 15-50 parts by mass with respect to 100 parts by mass of the rubber component, and the rubber composition has a minimum Mooney scorch viscosity measured at 125° C. of 70-130.

Abstract: The present invention relates to a transmission belt which is provided with: a rubber layer that is formed from a vulcanized product of a rubber composition which contains a rubber component containing an ethylene-?-olefin elastomer, a filler containing silica, a vulcanizing agent containing a sulfur-based vulcanizing agent, and a curable resin containing an amino resin; and a fiber member that is in contact with the rubber layer.

Abstract: A belt includes a laminate including a back surface layer disposed on a back surface side and a tension member layer including a tension member. The belt includes a sensor provided in the laminate and configured to detect a state of the belt, and a passive RFID also provided in the laminate, including an IC chip and an antenna, and configured to transmit state information on the belt detected by the sensor to an outside.

Abstract: The present invention pertains to a frictional power transmission belt including a tension member extending in the longitudinal direction of the belt and an adhesion rubber layer in contact with at least a portion of the tension member, in which the adhesion rubber layer is formed of a vulcanized rubber composition containing a rubber component, short fibers having an average fiber diameter of 2 ?m or more, and a filler.

Abstract: A toothed belt includes: a belt main body having a tooth portion and a groove portion alternately disposed at a fixed pitch in a longitudinal direction, and an outer portion disposed on the outer surface thereof; and a cord buried on a predetermined pitch line on the outer portion, in which the belt main body includes: a support layer, disposed under the cord and containing a thermoplastic polyurethane material; and a cured polyurethane elastomer in addition to the support layer, and in which the support layer is formed of a mixture of the thermoplastic polyurethane material and the polyurethane elastomer, which are integrally cured.