Mitsuboshi Belting Ltd.

Yusuke Hemmi

Susumu Osaki

Mayu Esaka

Eyobashenafi Tessema

Takumi Mizumoto

A toothed belt including a reinforcing layer with 0.05 mm to 0.2 mm thickness buried along a contour of tooth portions such that a maximum height from a bottom portion of the tooth portion to the reinforcing layer is in a range of 30% to 100% of a height from the bottom portion to a tooth tip, in which the reinforcing layer includes reinforcing fiber filaments arranged in a belt circumferential direction, in the reinforcing layer, a weight per unit area of fibers intersecting the belt circumferential direction is 30% or less of a weight per unit area of the reinforcing fiber filaments, the reinforcing layer has a structure where the reinforcing fiber filaments are arranged in the belt circumferential direction and bonded to form a sheet shape in an untwisted state, and a tensile modulus of the reinforcing fiber filament satisfies a specific condition.

Toothed belt

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.

Toothed belt and manufacturing method therefor

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-α-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.

Rubber composition and friction transmission belt

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.

Growing community of inventors

Hyogo, Japan

Yusuke Hemmi