# US 9,752,650 B2 · V-ribbed belt

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- Number: US 9,752,650 B2
- Document ID: US9752650B2
- Status: Granted
- Kind: B2
- Application number: 14/781,184
- Filed: 2014-03-27
- Published: 2016-02-25
- Granted: 2017-09-05
- Earliest claimed: 2013-03-29
- Assignees: Mitsuboshi Belting Ltd.
- Applicants: Mitsuboshi Belting Ltd.
- Inventors: Kazuyo Kojima; Yusuke Suzumegano; Yoshihito Noborikawa; Manabu Mitsutomi
- Web page: https://patentgrep.com/patent/US9752650B2

## CPC

- F16G 5/08: with textile reinforcement
- F16G 5/10: with metal reinforcement
- F16G 5/20: with a contact surface of special shape, e.g. toothed
- F16G: BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR

## Abstract

A V-ribbed belt contains an extension layer forming a belt back face, a compression layer provided on one side of the extension layer, and a tension member embedded between the extension layer and the compression layer and extending in a belt circumferential length direction. The compression layer has a plurality of V-shaped ribs formed to be extending in the belt circumferential length direction and to be a frictional power transmission surface with a pulley. The frictional power transmission surface is covered with a knitted fabric, in which the knitted fabric is knitted out of a polyester-based composite yarn and a cellulose-based natural spun yarn. The polyester-based composite yarn is a bulky yarn, and a knitting ratio of the cellulose-based natural spun yarn is not less than a knitting ratio of the polyester-based composite yarn.

## Claims

### Claim 1

A V-ribbed belt comprising
an extension layer that forms a belt back face;
a compression layer provided on one side of the extension layer; and
a tension member that is embedded between the extension layer and the compression layer and extends in a belt circumferential length direction,
wherein the compression layer has a plurality of V-shaped ribs formed to be extending in the belt circumferential length direction and to be a frictional power transmission surface with a pulley, the frictional power transmission surface being covered with a knitted fabric, and
wherein the knitted fabric is knitted out of a polyester-based composite yarn and a cellulose-based natural spun yarn, the polyester-based composite yarn being a bulky yarn, and a knitting ratio of the cellulose-based natural spun yarn being not less than a knitting ratio of the polyester-based composite yarn, and
wherein the bulky yarn contains at least one of the group consisting of composite yarns (conjugate yarns), covering yarns, crimped yarns, woolly textured yarns, taslan textured yarns, and interlace textured yarns.

### Claim 2 (depends on 1)

The V-ribbed belt according to claim 1, wherein the knitting ratio of the cellulose-based natural spun yarn is from 50% to 95% by mass.

### Claim 3 (depends on 1)

The V-ribbed belt according to claim 1, wherein the polyester-based composite yarn is a composite yarn in which polytrimethylene terephthalate (PTT) and polyethylene terephthalate (PET) are conjugated, or a composite yarn in which a polyurethane (PU) yarn is used as a core and its surface is covered with polyethylene terephthalate (PET).

### Claim 4 (depends on 1)

The V-ribbed belt according to claim 1, wherein the cellulose-based natural spun yarn is a cotton yarn.

### Claim 5 (depends on 1)

The V-ribbed belt according to claim 1, wherein the knitted fabric is a multilayered knitted fabric.

### Claim 6 (depends on 5)

The V-ribbed belt according to claim 5, wherein the cellulose-based natural spun yarn is arranged in the largest amount in the layer on a frictional power transmission surface side among the layers of the multilayered knitted fabric.

### Claim 7 (depends on 1)

The V-ribbed belt according to claim 1, wherein a bulky layer of the knitted fabric is provided on the frictional power transmission surface.

### Claim 8 (depends on 1)

The V-ribbed belt according to claim 1, wherein the knitted fabric is incorporated or adhered with a hydrophilizing agent.

### Claim 9 (depends on 1)

The V-ribbed belt according to claim 1, wherein the knitted fabric is knitted by weft knitting.

### Claim 10 (depends on 1)

The V-ribbed belt according to claim 1, wherein the polyester-based composite yarn is formed from two or more kinds of polymers.

### Claim 11 (depends on 1)

The V-ribbed belt according to claim 1, wherein the knitted fabric has a bulkiness of 2.0 cm3/g or more.