Aircraft pneumatic tire

Patent metadata

Field	Value
Publication number	US-10500899-B2
Application number	US-201414786988-A
Country	US
Kind code	B2
Filing date	May 2, 2014
Priority date	Jun 4, 2013
Publication date	Dec 10, 2019
Grant date	Dec 10, 2019

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 ).

First claim

The invention claimed is:

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.

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

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

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

Assignees

• Bridgestone Corp

Inventors

• Kato Kenshirou
• Takanami Takeshi

Classifications

• B60C2200/02

  for aircrafts · CPC title

• B60C2009/208

  Modulus of the cords · CPC title

• B60C2009/2285

  Twist structures · CPC title

• B29D30/3035

  by feeding a continuous band and moving it back and forth (zig-zag) to form an annular element · CPC title

• B60C2009/2261

  Modulus of the cords · CPC title