US 11,796,035 B2
V-ribbed belt and method for manufacturing same
Kazutaka Yokoyama, Hyogo (JP); Hiroki Takechi, Hyogo (JP); Arata Hasegawa, Hyogo (JP); Takeshi Nishiyama, Hyogo (JP); and Manabu Mitsutomi, Hyogo (JP)
Assigned to Mitsuboshi Belting Ltd., Kobe (JP)
Appl. No. 16/624,726
Filed by Mitsuboshi Belting Ltd., Kobe (JP)
PCT Filed Jun. 15, 2018, PCT No. PCT/JP2018/023040
§ 371(c)(1), (2) Date Dec. 19, 2019,
PCT Pub. No. WO2018/235755, PCT Pub. Date Dec. 27, 2018.
Claims priority of application No. 2017-120811 (JP), filed on Jun. 20, 2017; and application No. 2018-112540 (JP), filed on Jun. 13, 2018.
Prior Publication US 2021/0190176 A1, Jun. 24, 2021
Int. Cl. D02G 3/04 (2006.01); D02G 1/18 (2006.01); F16G 5/08 (2006.01); B29D 29/10 (2006.01); F16G 5/20 (2006.01); D06M 15/693 (2006.01); D02G 3/44 (2006.01)
CPC F16G 5/08 (2013.01) [B29D 29/10 (2013.01); D02G 1/18 (2013.01); D02G 3/04 (2013.01); D02G 3/447 (2013.01); D06M 15/693 (2013.01); F16G 5/20 (2013.01); D10B 2331/021 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A V-ribbed belt comprising a twisted cord that is obtained by mix-twisting: a high-elongation aramid fiber having an intermediate elongation under a load of 4 cN/dtex of 0.8% or higher and 3% or lower, and a tensile modulus of 50-100 GPa; and an aliphatic polyamide fiber having a lower tensile modulus than the high-elongation aramid fiber, and the V-ribbed belt having a tensile strength of 1.6 to 2.4 (kN/rib),
wherein the aliphatic polyamide fiber has a tensile modulus of 20 GPa or less, and
wherein the twisted cord is obtained by secondarily-twisting three untwisted yarns of the high-elongation aramid fiber or three primarily-twisted yarns of the high-elongation aramid fiber obtained by twisting the high-elongation aramid fiber in one direction; and one or a plurality of untwisted yarns of the aliphatic polyamide fiber or one or a plurality of primarily-twisted yarns of the aliphatic polyamide fiber obtained by twisting the aliphatic polyamide fiber in one direction,
wherein the twisted cord is a Lang lay cord.