Bando Chemical Industries, Inc.

Shogo Kobayashi

Hiroyuki Tachibana

Ikuhito Doi

Taiki Tsuchiya

Hideyuki Kato

Yuya Shindo

Keiichiro Matsuo

Shigeki Okuno

Yoshihito Nakahira

Takafumi Masuda

Noriaki Naoda

Kazuaki Matsuda

Teppei Nakayama

A friction transmission belt includes a compression layer forming a pulley contact portion, the compression layer includes an inner layer formed from a rubber composition and an outer layer provided on a pulley contact side of the inner layer and formed from a fiber member, and a ratio (M10 modulus/M50 modulus) of an modulus at 10% elongation in a belt longitudinal direction (M10 modulus) to an modulus at 50% elongation in the belt longitudinal direction (M50 modulus), of the rubber composition, is not less than 1.5.

Friction transmission belt

A raw edge V-belt includes: a compression rubber layer formed on an inner side of the belt and made of a rubber composition. The rubber composition contains a rubber component, fine cellulose fibers, and short fibers. The content of the short fibers in the rubber composition is 25 parts by mass or more and 45 parts by mass or less per 100 parts by mass of the rubber component, and the volume fraction of the short fibers in the rubber composition is 12.5 vol % or more.

Raw edge V-belt

A V-ribbed belt includes a plurality of V-shaped ribs, each of the plurality of V-shaped ribs includes a V-shaped rib body formed from a rubber composition and a rib-side reinforcing fabric covering a surface of the V-shaped rib body, the rib-side reinforcing fabric is a woven fabric containing a first fiber and a second fiber, and in the woven fabric, at least either the first fiber or the second fiber is inclined relative to a longitudinal direction and a width direction of the belt.

V-ribbed belt

A power transmission belt includes a belt body made of rubber and a cord embedded in the belt body. The belt body has a portion having the cord embedded therein, and the portion is made of a rubber composition having a storage normal modulus at 25&#xb0; C. in a grain direction of 80 MPa or more and the ratio of the storage normal modulus at 25&#xb0; C. in the grain direction to a storage normal modulus at 25&#xb0; C. in a cross-grain direction of 1.20 or more to 2.50 or less. The rubber composition is arranged such that the grain direction corresponds to a belt length direction and the cross-grain direction corresponds to a belt width direction.

Transmission belt

A power transmission belt includes a belt body at least portion of which is made of a rubber composition containing a rubber component, cellulose-based fine fibers, and cotton powder.

A power transmission belt includes a pulley non-contacting portion made of a rubber composition. The rubber composition contains a rubber component, cellulose-based fine fibers, and a non-carbon black hydrophilic inorganic filler, and contains no carbon black or contains carbon black in an amount of less than 20 parts by mass relative to 100 parts by mass of the rubber component.

A large V-belt includes an endless rubber belt body including an adhesive rubber layer and a cord embedded in the adhesive rubber layer of the belt body. The large V-belt has a belt thickness of 15 mm or more and the belt width of 10 mm or more at the center, in a belt thickness direction, of a cord embedded position. The belt body further includes reinforced rubber layers made of a rubber composition having a type A durometer hardness of 92 or more, the reinforced rubber layers being stacked on a belt inner side and/or a belt outer side of the adhesive rubber layer in the belt thickness direction.

Large V-belt

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.

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.

Disclosed is a power transmission belt having a belt body made of rubber, and a cord embedded in the belt body so as to form a helical pattern having a pitch in a belt width direction. The cord is coated with an adhesion layer formed by an adhesion treatment and containing a rubber component, and the adhesion layer is in contact with a rubber composition containing cellulose-based fine fibers.

A power transmission belt has a cord embedded in a belt body made of rubber. The cord is configured as a plied yarn with a total fiber fineness of 4000 to 5000 dtex. The plied yarn consists of four primarily-twisted yarns, each being obtained by subjecting a bundle of para-aramid fibers with a fiber fineness of 1000 to 1250 dtex to a primary twist in one direction at a twist coefficient of 1200 to 1350, and these four primarily-twisted yarns are then secondarily twisted in the opposite direction to the primary twist at a twist coefficient of 900 to 1100, thereby obtaining the plied yarn.

Growing community of inventors

Kobe, Japan

Shogo Kobayashi