V-ribbed belt and method for manufacturing same

Patent metadata

Field	Value
Publication number	US-11796035-B2
Application number	US-201816624726-A
Country	US
Kind code	B2
Filing date	Jun 15, 2018
Priority date	Jun 20, 2017
Publication date	Oct 24, 2023
Grant date	Oct 24, 2023

Abstract

The present invention relates to a V-ribbed belt that has a medium elongation of 0.8% or more when the load of 4 cN/dtex is applied, and that contains a twisted cord in which a high-elongation aramid fiber having a tensile modulus of 50-100 GPa and a low-modulus fiber having a lower tensile modulus than the high-elongation aramid fiber are blended and twisted.

First claim

The invention claimed is:

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.

2. The V-ribbed belt according to claim 1 , wherein the aliphatic polyamide fiber has a tensile modulus of 0.1 GPa or more.

3. The V-ribbed belt according to claim 1 , wherein the twisted cord has a proportion of the high-elongation aramid fiber of 60-95% by mass.

4. The V-ribbed belt according to claim 1 , wherein:
the twisted cord has a primary-twist coefficient of 0-6 and a secondary-twist coefficient of 2-6.

5. The V-ribbed belt according to claim 1 , wherein the high-elongation aramid fiber has a ratio of a secondary-twist coefficient to a primary-twist coefficient of 4-8.

6. The V-ribbed belt according to claim 1 , wherein the high-elongation aramid fiber has a ratio of a secondary-twist coefficient to a primary-twist coefficient of 5-7.

7. The V-ribbed belt according to claim 1 , wherein the high-elongation aramid fiber has a primary-twist coefficient of 1 or less.

8. The V-ribbed belt according to claim 1 , wherein the twisted cord is a plied cord and the high-elongation aramid fiber has a primary-twist coefficient of 2 or higher.

9. The V-ribbed belt according to claim 1 , wherein at least a part of a frictional power-transmission surface is covered with a cloth.

10. The V-ribbed belt according to claim 1 , which is mounted on an engine equipped with a belt type ISG drive.

11. A method for producing the V-ribbed belt according to claim 1 , the method comprising a core wire preparation step of subjecting the twisted cord to a bonding treatment to prepare a core wire, wherein,
the method comprises, in the core wire preparation step, thermally stretching and fixing the twisted cord at a heat-set stretching ratio of 3% or less during a heat treatment of the bonding treatment.

Assignees

• Mitsuboshi Belting Ltd

Inventors

• Yokoyama Kazutaka
• Takechi Hiroki
• Hasegawa Arata
• Nishiyama Takeshi
• Mitsutomi Manabu

Classifications

• F16G5/08 Primary

  with textile reinforcement · CPC title

• B29D29/10

  Driving belts having wedge-shaped cross-section · CPC title

• D02G1/18

  by combining fibres, filaments, or yarns, having different shrinkage characteristics {(D02G1/004 takes precedence)} · CPC title

• D02G3/04

  Blended or other yarns or threads containing components made from different materials · CPC title

• D02G3/447 Primary

  Yarns or threads for specific use in general industrial applications, e.g. as filters or reinforcement · CPC title