# US 10,500,899 B2 · Aircraft pneumatic tire

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- Number: US 10,500,899 B2
- Document ID: US10500899B2
- Status: Granted
- Kind: B2
- Application number: 14/786,988
- Filed: 2014-05-02
- Published: 2016-03-10
- Granted: 2019-12-10
- Earliest claimed: 2013-06-04
- Assignees: Bridgestone Corporation
- Applicants: Bridgestone Corporation
- Inventors: Kenshirou Kato; Takeshi Takanami
- Web page: https://patentgrep.com/patent/US10500899B2

## CPC

- B60C 9/20: built-up from rubberised plies each having all cords arranged substantially parallel
- B29D 30/22: Breaker plies being applied in the unexpanded state
- B29D 30/3035: {by feeding a continuous band and moving it back and forth (zig-zag) to form an annular element}
- B29D 30/44: Stretching or treating the layers before application on the drum (during application B29D30/30)
- B60C 9/0007: {Reinforcements made of metallic elements, e.g. cords, yarns, filaments or fibres made from metal}
- B60C 9/0042: {Reinforcements made of synthetic materials}
- B60C 9/22: the plies being arranged with all cords disposed along the circumference of the tyre
- D02G 3/48: Tyre cords {(tyre reinforcements B60C9/00; metal cords for reinforcing rubber or plastic articles D07B1/0606)}
- B60C 2009/0071: {characterised by special physical properties of the reinforcements}
- B60C 2009/208: {Modulus of the cords}
- B60C 2009/2096: {Twist structures}
- B60C 2009/2228: {characterised by special physical properties of the zero degree plies}
- B60C 2009/2261: {Modulus of the cords}
- B60C 2009/2285: {Twist structures}
- B60C 2200/02: for aircrafts
- B60C: VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B29D: PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE (making granules B29B9/00; making preforms B29B11/00)
- D02G: CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS

## Abstract

An object is to improve durability without increasing the tire mass. An aircraft pneumatic tire (10) includes: a carcass ply (12) that straddles between a pair of bead portions (24); an inside belt layer (14) that is provided at a tire radial direction outer side of a crown portion of the carcass ply (12); an outside belt layer (16) that is provided at the tire radial direction outer side of the inside belt layer (14) and that is configured by a cord of cord configuration elements that have been twisted together; a belt protection layer (18) that is provided at the tire radial direction outer side of the outside belt layer (16) and that is configured by a cord of cord configuration elements that have been twisted together; and a low elasticity portion that is provided at at least one of the cord of the belt protection layer (18) or the cord of the outside belt layer (16), and that has a lower elasticity than other length direction portions of the cord (32).

## Claims

### Claim 1

An aircraft pneumatic tire, comprising:
a carcass ply that straddles between a pair of bead portions;
an inside belt layer that is provided at a tire radial direction outer side of a crown portion of the carcass ply;
an outside belt layer that is provided at a tire radial direction outer side of the inside belt layer and that is configured by a cord of cord configuration elements that have been twisted together;
a belt protection layer that is provided at a tire radial direction outer side of the outside belt layer and that is configured by a cord of cord configuration elements that have been twisted together; and
a low elasticity portion that is provided at at least one of the cord of the belt protection layer or the cord of the outside belt layer, and that has a lower elasticity than other length direction portions of the cord; wherein
the low elasticity portion is configured as a hole that is formed from an outermost surface side of the cord in a diameter direction of the cord toward an inner region of the cord; and wherein
at least one of the belt protection layer or the outside belt layer is provided with low elasticity regions at which the low elasticity portions are concentrated;
the low elasticity regions are provided with an interval L therebetween in a tire circumferential direction;
the low elasticity portions are not provided between the low elasticity regions adjacent to each other in the tire circumferential direction; and
L/LL>0.3, where LL is a ground contact length of a tread in the tire circumferential direction.

### Claim 2 (depends on 1)

The aircraft pneumatic tire of claim 1, wherein the position of the low elasticity portion in a cord length direction differs in adjacent cords.

### Claim 3 (depends on 1)

The aircraft pneumatic tire of claim 1, wherein the size of the hole is less than the diameter of the cord.

### Claim 4 (depends on 1)

The aircraft pneumatic tire of claim 1, wherein the size of the hole is half the diameter of the cord configuration elements, or greater.