Abstract: The present invention relates to a pulley structure containing a first rotatable body, a second rotatable body and a torsional coil spring, in which the torsional coil spring has one end region, the outer circumferential surface of which is in contact with one rotatable body due to the self elastic restoring force when the pulley structure is in a stopped state, the other end region, the inner circumferential surface of which is in contact with the other rotatable body when the pulley structure is in the stopped state, and a middle region, and in which when the torsional coil spring is twisted in the diameter increasing direction, the inner circumferential surface of at least a circumferential portion of the other end region of the torsional coil spring separates from the other rotatable body.

Abstract: The present invention relates to an auto-tensioner containing a base having a cylindrical part, a rotating member supported rotatably to the base, a pulley provided at the rotating member, a friction member sandwiched between the cylindrical part and the rotating member, and a coil spring locked to the friction member and the base and disposed in a state of being compressed in an axial direction, thereby biasing the rotating member in one direction, in which the friction member has an arcuate surface capable of sliding along the cylindrical part, a first locking part located further toward the one direction side than the arcuate surface in a circumferential direction of the cylindrical part and locked to the rotating member, and a second locking part locked to one end of the coil spring.

Abstract: The present invention relates to a toothed belt containing tooth parts that are disposed at predetermined intervals along a belt longitudinal direction, a cord, and a back side that has the cord embedded therein, in which the cord contains a Lang-twisted glass fiber, an adhesion treatment layer, and an overcoat treatment layer, the overcoat treatment layer is formed on a surface of the adhesion treatment layer, the back side is composed of a rubber composition, and the rubber composition contains from 5 parts by mass to 20 parts by mass of a plasticizer based on 100 parts by mass of a rubber component.

Abstract: The present invention relates to a frictional power transmission belt having a frictional power transmission surface covered with a warp knitted fabric, in which the warp knitted fabric contains a water absorptive thread in a proportion of 30% by mass or more based on the total amount of threads constituting the warp knitted fabric and a wale direction of the warp knitted fabric is substantially parallel to a belt longitudinal direction.

Abstract: The present invention relates to a conductive composition containing a conductive metal powder and a resin component, in which the conductive metal powder contains at least a metal flake having a crystalline structure in which a metal crystal grows in a flake shape, and the resin component contains an aromatic amine skeleton.

Abstract: The present invention relates to a power transmission belt containing a tension member extending in a belt lengthwise direction, an adhesion rubber layer in contact with at least a part of the tension member, a compression rubber layer formed on one surface of the adhesion rubber layer, and a tension rubber layer formed on other surface of the adhesion rubber layer, in which the compression rubber layer is formed of a vulcanized rubber composition containing a rubber component, a polyolefin resin and a reinforcing material, the rubber component contains a chloroprene rubber, and the reinforcing material contains a short fiber.

Abstract: The present invention relates to a manufacturing method of an aramid cord, containing at least a first treatment step of treating an untreated yarn for the aramid cord with a first treating agent containing a rubber-modified epoxy resin and a rubber-unmodified epoxy resin, an aramid cord obtained by the method, a power transmission belt using the aramid cord, and the treating agent.

Abstract: The present invention relates to a power transmission belt containing a frictional power transmission part and a fiber member that covers a surface of the frictional power transmission part, in which the fiber member is formed of a fiber (A) containing a water-absorbent fiber (A1) and contains a surfactant, to a fiber member used in the power transmission belt, and to a method for manufacturing the fiber member.

Abstract: The present invention relates to a toothed belt driving device for bicycle, in which, in drive state, the pulley groove portion of a driven pulley is in surface contact with a portion of a surface of the belt tooth portion, this portion in surface contact is present in a range positioned closer to a tooth root portion than a reference circle, the maximum value of the shortest distance between the pulley groove portion of the driven pulley and the surface of the belt tooth portion opposite to the traveling direction of the belt is 10% or more and 18% or less of the tooth pitch, a groove depth of the driven pulley is greater than the tooth height of the belt tooth portion, and the difference therebetween is 5% or more of the tooth height.

Abstract: The present invention relates to a toothed belt containing a plurality of tooth parts that are disposed at predetermined intervals along the longitudinal direction and contain a rubber composition (A) as a base material and a back side that has a cord embedded therein and contains a rubber composition (B) as a base material, in which the cord contains a Lang-twisted carbon fiber and is formed in a diameter of 1.1 mm or more and 2.5 mm or less and the rubber composition (B) constituting the back side has a hardness of from 80 degrees to 89 degrees in JIS-A hardness.

Abstract: A power transmission belt having a body with a length, an inside, an outside, laterally spaced sides, and a plurality of ribs extending lengthwise at one of the inside and outside of the body. The body has a rubber layer at the other of the inside and outside of the body in which non-straight, short fibers are embedded.

Abstract: The present invention relates to a cover fabric for power transmission belt, which covers at least a part of working surface of a power transmission belt coming into contact or engage with a pulley and thereby transmitting power, in which the cover fabric contains a yarn, the yarn contains at least a fluorine-based fiber, and the fluorine-based fiber is formed of at least one slit yarn, and the cover fabric is subjected to an adhesion treatment.

Abstract: The present invention relates to a belt installation tool which is to be installed so as to cover at least a part of a first side surface of a pulley, including an attaching part attached along an outer peripheral part of the pulley, an installation part brought into contact with at least a part of the first side surface, a protection part covering at least a part of the first side surface without coming into contact therewith, and a belt holding part protruding on the protection part or on the installation part, in which the protection part covers at least a part of a part having a largest distance in a vertical direction in an area located inside the part with which the installation part comes into contact in the first side surface.

Abstract: A power transmission belt having a body with a length, a width between laterally spaced sides, and a thickness between inside and outside surfaces. At least one load carrying member extends in a lengthwise direction. The body has a plurality of teeth spaced along at least one of the inside and outside of the body. The teeth have a width that decreases progressively from: a) a first location between the inside and outside surfaces; and b) one of the inside and outside surfaces so that the one surface has a width that is less than a width of the other surfaces. A cloth layer is applied to the one surface and is a multiwoven structure with interwoven: a) warp; and b) at least two different wefts.

Abstract: A power transmission belt with a body made from a first rubber composition in which at least one load carrying member is embedded. The body has a plurality of laterally spaced ribs with exposed surfaces on the inside of the body. The ribs are made from a second rubber composition in which: a) a plasticizer of 8.3 to 10.7 (cal/cm3)1/2 in solubility parameter; and b) solid lubricant are respectively blended in an amount: i) 5 to 25 pts.wt.; and ii) 5 to 50 pts.wt. per 100 pts.wt. ethylene-?-olefin elastomer. The body further has short fibers fixed at the exposed, pulley engaging rib surfaces.

Abstract: The present invention relates to a V-ribbed belt containing an extension layer forming a belt back face, a compression layer provided on one side of the extension layer, and a tension member embedded between the extension layer and the compression layer and extending in a belt circumferential length direction, in which the compression layer has a plurality of V-shaped ribs formed to be extending in the belt circumferential length direction and to be a frictional power transmission surface with a pulley and the frictional power transmission surface is covered with a knitted fabric, in which the knitted fabric is knitted out of a polyester-based composite yarn and a cellulose-based natural spun yarn, the polyester-based composite yarn is a bulky yarn, and a knitting ratio of the cellulose-based natural spun yarn is not less than a knitting ratio of the polyester-based composite yarn.

Abstract: The present invention relates to a power transmission belt provided with a tension member, a tension member-supporting layer, a tension rubber layer, and a compression rubber layer, the belt having a plurality of cog portions, in which the tension member is formed of an aramid fiber, the compression rubber layer is formed of a vulcanized rubber composition containing a rubber component and aramid short fibers embedded in the vulcanized rubber composition with being arranged in a width direction of the belt, the power transmission belt has a strain of from 0.5 to 0.8% when compressed under a stress of 2.0 N/mm2 in the width direction, and the power transmission belt has a strain of from 0.35 to 0.7% when pulled under a load of 2 kN in the lengthwise direction.

Abstract: The present invention relates to a frictional power transmission belt containing an extensible layer to form a belt back surface, a compressive layer formed on one surface of the extensible layer and having a power transmission surface at least a part of which can be in contact with pulleys, and a tension member embedded between the extensible layer and the compressive layer along a belt length direction, in which at least the compressive layer is formed of a rubber composition containing a polymer component, short fibers and a surfactant and in which the short fibers contain at least short fibers of water-absorbing fibers.

Abstract: An auto-tensioner includes: a stationary member having a first cylindrical portion; a rotatable member having a second cylindrical portion at least partially overlapping the first cylindrical portion in a radial direction; and a drainage mechanism provided at a boundary part of the first and second cylindrical portions, including a water inlet configured by a gap between an outer peripheral surface of the first cylindrical portion and an outer peripheral surface of the second cylindrical portion and being open along a peripheral direction, a water passage which is configured by a gap between a water collecting groove formed along the peripheral direction in the outer peripheral surface of one of the two cylindrical portions and the other cylindrical portion, and communicates with the water inlet, and at least one drainage port formed in a peripheral wall on an outside in the radial direction of the water passage.

Abstract: 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.