US 12,270,455 B2
Transmission belt
Atsushi Taga, Kobe (JP)
Assigned to BANDO CHEMICAL INDUSTRIES, LTD., Kobe (JP)
Filed by BANDO CHEMICAL INDUSTRIES, LTD., Kobe (JP)
Filed on May 19, 2024, as Appl. No. 18/668,219.
Application 18/668,219 is a division of application No. 18/211,087, filed on Jun. 16, 2023, granted, now 12,031,608.
Application 18/211,087 is a division of application No. 17/994,236, filed on Nov. 25, 2022, granted, now 11,708,879, issued on Jul. 25, 2023.
Application 17/994,236 is a continuation of application No. PCT/JP2021/024895, filed on Jul. 1, 2021.
Claims priority of application No. 2020-115525 (JP), filed on Jul. 3, 2020.
Prior Publication US 2024/0301939 A1, Sep. 12, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. F16G 1/28 (2006.01); D02G 3/26 (2006.01); D02G 3/44 (2006.01)
CPC F16G 1/28 (2013.01) [D02G 3/26 (2013.01); D02G 3/44 (2013.01); D10B 2101/12 (2013.01); D10B 2505/02 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A power transmission belt including a belt body made of an elastomer, and a cord made of carbon fibers and provided to be embedded in the belt body and to form a helical pattern having a pitch in a belt width direction,
when the cord is viewed from a side orthogonal to a length direction of the cord, an angle of an outermost filament in a filament bundle of the carbon fibers forming the cord with respect to the length direction of the cord being 8° or more to 20° or less,
the belt body being formed of a polyurethane resin obtained by curing an urethane composition containing an urethane polymer,
the belt body being a toothed belt body,
the cord being a single twist yarn obtained by twisting a filament bundle of the carbon fibers in one direction,
in the cord of the single twist yarn, a total number of filaments of the carbon fibers forming the cord of the single twist yarn being 12000, a number of twists of the cord per 10 cm length being 5.0/10 cm or more to 11.0/10 cm or less,
a belt tension T0.1 per 1 mm belt width at 0.1% of a belt extension rate being 30 N/mm or more to 50 N/mm or less.