Mitsuboshi Belting Ltd.

Hirofumi Okabe

Masakuni Yoshida

Yasuyuki Izu

Yuto Hoki

A toothed belt power-transmission apparatus includes: a toothed belt which includes a cord and a plurality of belt tooth portions; and a plurality of toothed pulleys which include a plurality of pulley tooth portions. The cord includes a carbon fiber cord formed by combining and secondarily twisting a plurality of primary twisted yarns including a carbon fiber. A twisting direction of a primary twist of the primary twisted yarns is the same as a twisting direction of the secondary twist. A primary twisting coefficient of the primary twist is 0.62 to 1.30. A secondary twisting coefficient of the secondary twist is 2.06 to 3.95. A tooth pitch of the toothed belt is within a range of −0.4% to +0.1% relative to a tooth pitch of the toothed pulley around which the toothed belt is wound.

Toothed belt transmission device

A toothed belt includes 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.

Toothed belt

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.

Toothed power transmission belt

A power transmission belt has a body with a length, a width, an inside and an outside. The body has at least one load carrying member embedded in rubber and extending in a lengthwise direction. The body defines a plurality of teeth spaced along the length of the belt on at least one of the inside and outside of the body. At least one of: (a) the at least one load carrying member has an occupying rate (R) that is not less than 75%, with R=n&#xd7;Dc/B&#xd7;100 where: n=number of load carrying members aligned along the width of the body; Dc=diameter of load carrying member(s); and B=width of the body; and (b) the at least one load carrying member has a cross-sectional area taken transversely to the length of the body that is in a range of 1.10 to 1.70 mmper 1 mm of belt width.

Growing community of inventors

Hyogo, Japan

Hirofumi Okabe