Radial tire for aircraft

Patent metadata

Field	Value
Publication number	US-11203232-B2
Application number	US-201716349764-A
Country	US
Kind code	B2
Filing date	May 23, 2017
Priority date	Nov 14, 2016
Publication date	Dec 21, 2021
Grant date	Dec 21, 2021

Abstract

A radial tire for an aircraft, the radial tire having a rim diameter of 20 inches or less includes a pair of bead portions; a pair of sidewall portions extending outward from the bead portions in a substantially radial direction; a tread portion that couples together respective radial outer ends of the sidewall portions; a toroidal carcass layer reinforcing a portion between bead cores embedded in the bead portions; a belt layer and a tread that are sequentially laminated on an outer side of the carcass layer in the radial direction, wherein a value M obtained by dividing a tire external diameter D by a distance L between bead heels of the bead portions is in a range of from 4.1 to 5.4.

First claim

The invention claimed is:

1. A radial tire for an aircraft, the radial tire having a rim diameter of 20 inches or less, the radial tire comprising:
a pair of bead portions;
a pair of sidewall portions extending outward from the bead portions in a substantially radial direction;
a tread portion that couples together respective radial outer ends of the sidewall portions;
a toroidal carcass layer reinforcing a portion between bead cores embedded in the bead portions; and
a belt layer and a tread that are sequentially laminated on an outer side of the carcass layer in the radial direction,
wherein a value M obtained by dividing a tire external diameter D by a distance L between bead heels of the bead portions is in a range of from 4.1 to 5.4;
wherein in a case in which A represents an intersection between an internal surface edge in a tire meridional cross section and a normal N that is normal relative to the carcass layer and passes through a tread ground contact end E, B represents a length between a tire equator S and the intersection A along the carcass layer, C represents a radius of curvature of the internal surface edge at the tire equator S, and J represents a radius of curvature of the internal surface edge between the intersection A and a point H that is distanced 0.84 times the length B apart from the tire equator S, a value G obtained by dividing the radius of curvature J by the radius of curvature C is in a range of from 0.152 to 0.166.

2. The radial tire for an aircraft according to claim 1 , wherein the belt layer comprises at least three main belt layers, in which non-stretchable main belt cords extending in a circumferential direction are embedded, and a lower number of secondary belt layers than a number of the main belt layers, and wherein each of the secondary belt layers comprises a ribbon-shaped body and secondary belt cords embedded in the ribbon-shaped body, the ribbon-shaped body being wound in a zigzag manner and folded over at both ends in the width direction.

3. The radial tire for an aircraft according to claim 1 , wherein a pair of inner side main grooves, extending in a circumferential direction, is formed in a tread surface of the tread on respective sides of a tire equator S, and a pair of outer side main grooves is formed in the tread surface respective outer sides of the inner side main grooves in a width direction, such that one inner side rib extending in the circumferential direction is formed between the inner side main grooves, and a pair of middle ribs extending in the circumferential direction are respectively formed between the inner side main grooves and the outer side main grooves, and a pair of outer side ribs is respectively formed between the outer side main grooves and a ground contact ends of the tread, wherein a rib width T of the inner side rib is in a range of from 1.2 to 1.8 times a rib width R of each of the middle ribs, and a rib width U of each of the outer side ribs is in a range of from 0.8 to 1.4 times the rib width R of the middle ribs.

4. The radial tire for an aircraft according claim 1 , wherein a radius of curvature of the belt layer in a tire meridional cross section is larger than a radius of curvature of a tread surface of the tread in the tire meridional cross section.

5. The radial tire for an aircraft according to claim 1 , wherein the belt layer comprises at least three main belt layers, in which non-stretchable main belt cords extending in a circumferential direction are embedded, and a lower number of secondary belt layers than a number of the main belt layers, and wherein each of the secondary belt layers comprises a ribbon-shaped body and secondary belt cords embedded in the ribbon-shaped body, the ribbon-shaped body being wound in a zigzag manner and folded over at both ends in the width direction, and
the belt layer comprises four of the main belt layers, and a width K of a fourth main belt layer disposed outermost in the radial direction is in a range of from 0.1 to 0.3 times a width Q of a first main belt layer disposed innermost in the radial direction.

6. The radial tire for an aircraft according to claim 1 , wherein the belt layer comprises at least three main belt layers, in which non-stretchable main belt cords extending in a circumferential direction are embedded, and a lower number of secondary belt layers than a number of the main belt layers, and wherein each of the secondary belt layers comprises a ribbon-shaped body and secondary belt cords embedded in the ribbon-shaped body, the ribbon-shaped body being wound in a zigzag manner and folded over at both ends in the width direction, and
a pair of inner side main grooves, extending in a circumferential direction, is formed in a tread surface of the tread on respective sides of a tire equator S, and a pair of outer side main grooves is formed in the tread surface respective outer sides of the inner side main grooves in a width direction, such that one inner side rib extending in the circumferential direction is formed between the inner side main grooves, and a pair of middle ribs extending in the circumferential direction are respectively formed between the inner side main grooves and the outer side main grooves, and a pair of outer side ribs is respectively formed between the outer side main grooves and a ground contact ends of the tread, wherein a rib width T of the inner side rib is in a range of from 1.2 to 1.8 times a rib width R of each of the middle ribs, and a rib width U of each of the outer side ribs is in a range of from 0.8 to 1.4 times the rib width R of the middle ribs.

7. The radial tire for an aircraft according to claim 1 , wherein the belt layer comprises at least three main belt layers, in which non-stretchable main belt cords extending in a circumferential direction are embedded, and a lower number of secondary belt layers than a number of the main belt layers, and wherein each of the secondary belt layers comprises a ribbon-shaped body and secondary belt cords embedded in the ribbon-shaped body, the ribbon-shaped body being wound in a zigzag manner and folded over at both ends in the width direction, and
a radius of curvature of the belt layer in a tire meridional cross section is larger than a radius of curvature of a tread surface of the tread in the tire meridional cross section.

8. The radial tire for an aircraft according to claim 1 , wherein a pair of inner side main grooves, extending in a circumferential direction, is formed in a tread surface of the tread on respective sides of a tire equator S, and a pair of outer side main grooves is formed in the tread surface respective outer sides of the inner side main grooves in a width direction, such that one inner side rib extending in the circumferential direction is formed between the inner side main grooves, and a pair of middle ribs extending in the circumferential direction are respectively formed between the inner side main grooves and the outer side main grooves, and a pair of outer side ribs is respectively formed between the outer side main grooves and a ground contact ends of the tread, wherein a rib width T of the inner side rib is in a range of from 1.2 to 1.8 times a rib width R of each of the middle ribs, and a rib width U of each of the outer side ribs is in a range of from 0.8 to 1.4 times the rib width R of the middle ribs, and
a radius of curvature of the belt layer in a tire meridional cross section is larger than a radius of curvature of a tread surface of the tread in the tire meridional cross section.

9. The radial tire for an aircraft according to claim 1 , wherein the belt layer comprises at least three main belt layers, in which non-stretchable main belt cords extending in a circumferential direction are embedded,

Assignees

• Bridgestone Corp

Inventors

• Hashimoto Kenji

Classifications

• B60C11/00

  Tyre tread bands; Tread patterns; Anti-skid inserts · CPC title

• B60C11/0083

  characterised by the curvature of the tyre tread · CPC title

• B60C9/20

  built-up from rubberised plies each having all cords arranged substantially parallel · CPC title

• B60C9/08

  the cords extend transversely from bead to bead, i.e. radial ply (B60C9/07 takes precedence) · CPC title

• B60C2009/2032

  characterised by the course of the belt cords, e.g. undulated or sinusoidal · CPC title