Bando Chemical Industries, Inc.

Yuji Sekiguchi

Hisashi Matsuda

Eijiro Nakashima

Katsuyoshi Fujiwara

Takamitsu Akashi

Tadahiko Noguchi

Tomonari Nakamura

Shinji Suzuki

A toothed belt includes: a belt body having a flat band-shaped back rubber portion and tooth rubber portions placed on an inner circumferential side of the back rubber portion, the back rubber portion and the tooth rubber portions being each composed of a thermoplastic elastomer composition; a cord containing carbon filaments; and a tooth portion covering material provided on an inner circumferential side of the belt body and covering the tooth rubber portions. An elastomer component of the thermoplastic elastomer composition is a TPAE or a TPC, a hardness of the thermoplastic elastomer composition forming the back rubber portion is not less than 25 and not greater than 70, a hardness of the thermoplastic elastomer composition forming the tooth rubber portions is not less than 40 and not greater than 70, and the hardness of the thermoplastic elastomer composition forming the back rubber portion is not greater than the hardness of the thermoplastic elastomer composition forming the tooth rubber portions.

Toothed belt

A toothed belt includes an uneven surface formed due to a weave pattern of a woven fabric or a knit loop pattern of a knitted fabric at a tooth bottom portion between toothed portions.

A toothed belt includes an endless back portion, a plurality of belt teeth arranged on a face of the back portion at predetermined intervals in a longitudinal direction of the back portion; and a core made of an elastic knitted or unwoven fabric and embedded in the back portion. Both of the belt teeth and the back portion are made of rubber. The core is not exposed from inter-tooth portions which are located between the belt teeth. In the core, a difference between the position of a point that is closest to the belt teeth in a belt thickness direction and the position of a point that is closest to a back face of the belt in the belt thickness direction is limited to 0.5 mm or less.

Toothed belt, production method therefor, and belt transmission device

A toothed belt includes: a back portion; and a plurality of helical teeth provided on an inner periphery of the back portion and disposed at a fixed pitch in a belt longitudinal direction. An angle &#x3b8; between a tooth trace direction of the helical teeth and a belt lateral direction is in a range of 7 degrees to 10 degrees, both inclusive. A ratio A of a thickness tb of the back portion to a tooth height hb of the helical teeth, which is given by A=100&#xd7;tb/hb, is in a range of 120% to 240%, both inclusive.

Toothed belt and belt reduction gear including the same

A drive belt includes an endless belt body made of an ethylene-&#x3b1;-olefin elastomer composition and a cord embedded in the belt body to form a spiral at a specified pitch in a widthwise direction of the belt. The drive belt has a bending stiffness not larger than 0.064 N&#xb7;cmper a belt width of 4.8 mm and the belt body has a Wallace rubber hardness not smaller than 60&#xb0;.

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Kobe, Japan

Yuji Sekiguchi