# US 12,181,020 B2 · Cogged V-belt

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- Number: US 12,181,020 B2
- Document ID: US12181020B2
- Status: Granted
- Kind: B2
- Application number: 17/784,852
- Filed: 2020-12-11
- Published: 2023-01-05
- Granted: 2024-12-31
- Earliest claimed: 2019-12-13
- Assignees: Mitsuboshi Belting Ltd.
- Applicants: Mitsuboshi Belting Ltd.
- Inventors: Takanori Hiroshima; Akihiko Tokuda
- Web page: https://patentgrep.com/patent/US12181020B2

## CPC

- 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

The present invention relates to a cogged V-belt, including a cog portion containing cog ridges and cog valleys, and having a belt thickness of 19 to 36 mm and a cog height of 14 to 19 mm, in which the cog valley has a cross-sectional shape including a bottom portion formed by combining a plurality of continuous arcs and side walls of the cog valley, in which the plurality of arcs has curvature radius decreasing as a distance from a deepest portion of the cog valley increases, and includes a first arc passing through the deepest portion of the cog valley, having a diameter larger than a virtual circle tangent to the deepest portion and the both side walls and having a curvature radius of 7 to 10 mm.

## Claims

### Claim 1

A cogged V-belt, comprising:
a cog portion in which a plurality of cog ridges and cog valleys are alternately provided along a belt longitudinal direction, provided at least on a belt inner peripheral side, and
having a belt thickness H of 19 to 36 mm and a cog height H1 of 14 to 19 mm,
wherein the cog valley has a cross-sectional shape in a cross section in the belt longitudinal direction, comprising:
a bottom portion formed by combining a plurality of continuous arcs; and
side walls of the cog valley inclined with respect to a belt thickness direction,
wherein the plurality of arcs includes:
a first arc that passes through the deepest portion of the cog valley, has a diameter larger than a virtual circle tangent to three points of the deepest portion and the side walls on both sides of the cog valley, and has a curvature radius R1 of 7.5 to 9.5 mm; and
a second arc that connects the first arc and an extension line of a side wall in a curved shape so as to be tangent to the first arc and the extension line of the side wall, and has a curvature radius R2 of 1.5 to 2.8 mm.

### Claim 2 (depends on 1)

The cogged V-belt according to claim 1,
wherein the second arc has a curvature radius R2 of 1.8 to 2.5 mm.

### Claim 3 (depends on 1)

The cogged V-belt according to claim 1, further comprising:
a tension member layer including a cord arranged at intervals in a belt width direction,
a tension rubber layer laminated on a belt outer peripheral side of the tension member layer, and
a compression rubber layer laminated on the belt inner peripheral side of the tension member layer, and
having a center-valley thickness H2, which is a distance from a center portion of the cord to the deepest portion of the cog valley, being 6 to 13 mm, and a ratio of the center-valley thickness H2 to the belt thickness H being 20 to 40%.

### Claim 4 (depends on 1)

The cogged V-belt according to claim 1,
wherein the cog ridge has a side surface and a top portion, each formed in a straight line.

### Claim 5 (depends on 1)

The cogged V-belt according to claim 1, being used for a power transmission belt of a belt-type variable speed device of a large-sized agricultural machine.

### Claim 6 (depends on 1)

The cogged V-belt according to claim 1, wherein the belt thickness His 19.8 to 36 mm.

### Claim 7 (depends on 1)

The cogged V-belt according to claim 1, wherein the belt thickness H is 27 to 36 mm.