V-ribbed belt and method for manufacturing same

Patent metadata

Field	Value
Publication number	US-10174808-B2
Application number	US-201815916092-A
Country	US
Kind code	B2
Filing date	Mar 8, 2018
Priority date	Oct 9, 2015
Publication date	Jan 8, 2019
Grant date	Jan 8, 2019

Abstract

A V-ribbed belt has a cord made of polyester-based fibers, the total fiber fineness of which is 2200 dtex or more and 5500 dtex or less. A fiber fineness of the cord per belt width corresponding to a single V-shaped rib ranges from 10000 dtex to 19000 dtex. A belt dry-heat shrinkage force per belt width corresponding to a single V-shaped rib is 44 N or more. The belt dry-heat shrinkage force is a load increase with respect to a belt length of 300 mm in 30 minutes after applying, in an atmosphere of 150° C., a load of 6N in the belt longitudinal direction and holding the belt.

First claim

What is claimed is:

1. A V-ribbed belt comprising:
a V-ribbed belt body made of rubber and provided with a plurality of V-shaped ribs extending in a belt longitudinal direction and arranged parallel to one another in a belt width direction; and
a cord buried in the V-ribbed belt body such that the cord forms a helical pattern having a pitch in the belt width direction, wherein
the cord is made of a plied yarn with a total fiber fineness ranging from 2200 dtex to 5500 dtex, the plied yarn being formed by preparing a plurality of first-twist yarns, each obtained by twisting a bundle of polyester-based fibers in one direction, and secondly twisting the plurality of first-twist yarns in a direction opposite to a first-twist direction,
a fiber fineness of the cord per belt width corresponding to the single V-shaped rib ranges from 10000 dtex to 19000 dtex, and
a belt dry-heat shrinkage force per belt width corresponding to the single V-shaped rib is 44 N or more, the belt dry-heat shrinkage force being a load increase with respect to a belt length of 300 mm in 30 minutes after applying, in an atmosphere of 150° C., a load of 6N in the belt longitudinal direction and holding the belt.

2. The V-ribbed belt of claim 1 , wherein
the number of first-twist yarns of the plied yarn making the cord is two or more and five or less.

3. The V-ribbed belt of claim 1 , wherein
a fiber fineness of the first-twist yarn of the plied yarn making the cord is 1100 dtex.

4. The V-ribbed belt of claim 1 , wherein
the cord has an outer diameter of 0.50 mm or more and 1.00 mm or less.

5. The V-ribbed belt of claim 1 , wherein
the pitch of the cord in the belt width direction is 0.70 mm or more and 1.10 mm or less.

6. The V-ribbed belt of claim 1 , wherein
a distance between portions of the cord adjacent to each other in the belt width direction is 0.08 mm or more and 0.20 mm or less.

7. The V-ribbed belt of claim 1 , wherein
a belt flexural rigidity per belt width corresponding to the single V-shaped rib is 0.045 N-m 2 or more and 0.080 N-m 2 or less.

8. A method for forming the V-ribbed belt of claim 1 , wherein
the cord undergoes, during an adhesion treatment in which the cord is soaked in an adhesive agent and heated, a stretching and thermal fixation process in which the cord is stretched while tension is applied to the cord, and
a degree of stretching in the stretching and thermal fixation process is greater than 6.0%.

9. The method of claim 8 , wherein
a dry-heat shrinkage force of the cord which has undergone the adhesion treatment and the stretching and thermal fixation process is 0.20 cN/dtex or more and 0.50 cN/dtex or less.

Assignees

• Bando Chemical Ind

Inventors

• Shindo Yuya

Classifications

• B32B2260/048

  Natural or synthetic rubber · CPC title

• D10B2331/04

  polyesters, e.g. polyethylene terephthalate [PET] · CPC title

• B32B3/30

  characterised by a layer formed with recesses or projections, e.g. {hollows, grooves, protuberances, ribs (apertured layer B32B3/266; layer with cavities or internal voids B32B3/26)} · CPC title

• D02G3/28

  Doubled, plied, or cabled threads {(D02G3/32, D02G3/36 take precedence; effect yarns D02G3/34; details of spindles, e.g. bearings D01H7/86)} · CPC title

• B32B2307/546

  Flexural strength; Flexion stiffness · CPC title