Bando Chemical Industries, Inc.

Honda Motor Co., Ltd.

Keiichiro Matsuo

Hiroyuki Tachibana

Shogo Kobayashi

Michio Asumi

Hirokazu Komuro

Taiki Tsuchiya

A power transmission belt is at least partially formed of a rubber composition. The rubber composition contains a rubber component, cellulose nanofibers, and carbon black. The amount of the cellulose nanofibers to be added is from 0.1 parts by mass to 20 parts by mass, relative to 100 parts by mass of the rubber component. The amount of the carbon black to be added is from 5 parts by mass to 80 parts by mass, relative to 100 parts by mass of the rubber component. The sum of the amount of the carbon black to be added and three times the amount of the cellulose nanofibers to be added is from 15 to 90.

Transmission belt

A power transmission belt at least includes a bottom rubber layer. A rubber composition for forming the bottom rubber layer contains a rubber component, cellulose fine fibers, and short fibers. The cellulose fine fibers have an average diameter from 1 nm to 200 nm, and the rubber composition contains 0.5 parts by mass or more of the cellulose fine fibers relative to 100 parts by mass of the rubber component. The short fibers have an average diameter from 5 &#x3bc;m to 30 &#x3bc;m, and the rubber composition contains 1 part by mass or more of the short fibers relative to 100 parts by mass the rubber component.

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Kobe, Japan

Keiichiro Matsuo