Pneumatic tire

Patent metadata

Field	Value
Publication number	US-11241914-B2
Application number	US-201615750808-A
Country	US
Kind code	B2
Filing date	Aug 4, 2016
Priority date	Aug 6, 2015
Publication date	Feb 8, 2022
Grant date	Feb 8, 2022

Abstract

A pneumatic tire is provided in which an inner tie rubber layer and an outer tie rubber layer are selectively disposed between a carcass layer and an innerliner layer in a region on both sides in a tire width direction excluding a center region of a tread portion. End portions of the inner tie rubber layer and outer tie rubber layer on a tire equator side are disposed within a range of from 10 mm to 25 mm on an inner side in the tire width direction from an end portion on an outermost side in the tire width direction of a belt layer. A rubber thickness t1 of the inner tie rubber layer differs from a rubber thickness t2 of the outer tie rubber layer. A rubber thickness of the outer tie rubber layer is from 120% to 200% a rubber thickness of the inner tie rubber layer.

First claim

The invention claimed is:

1. A pneumatic tire, comprising:
an annular-shaped tread portion where a mounting direction with regard to a vehicle is specified, and that extends in a tire circumferential direction;
a pair of sidewall portions disposed on both sides of the tread portion;
a pair of bead cores disposed on an inner side in a tire radial direction of the sidewall portions;
a carcass layer bridging between the pair of bead cores;
a belt layer being disposed on an outer circumferential side of the carcass layer in the tread portion;
an innerliner layer being disposed on a tire inner surface along the carcass layer; and
partial tie rubber layers being selectively disposed between the carcass layer and innerliner layer in a region on both sides in a tire width direction excluding a center region of the tread portion; wherein
end portions of the partial tie rubber layers on a tire equator side are disposed within a range of from 10 mm to 25 mm on the inner side in the tire width direction from an end portion on an outermost side in the tire width direction of the belt layers;
end portions of the partial tie rubber layers on outermost sides opposite the end portions on the tire equator side terminate radially outwardly of a radially outermost position of the bead cores;
a rubber thickness t 1 of an inner tie rubber layer disposed on a vehicle inner side being one of the partial tie rubbers differs from a rubber thickness t 2 of an outer tie rubber layer disposed on a vehicle outer side being the other of the partial tie rubbers;
the rubber thickness t 2 of the outer tie rubber layer is from 120% to 200% of the rubber thickness t 1 of the inner tie rubber layer;
the rubber thickness t 1 is from 0.5 mm to 0.8 mm; and
the rubber thickness t 2 is from 0.7 mm to 1.0 mm.

2. The pneumatic tire according to claim 1 , wherein a periphery length x 1 of an inner tie rubber layer differs from a periphery length x 2 of an outer tie rubber layer, and a difference Δx between the periphery length x 2 of the outer tie rubber layer and the periphery length x 1 of the inner tie rubber layer is 5 mm or greater and 0.25 times or less a periphery length X of a tire inner surface from a bead toe to a tire equator.

3. The pneumatic tire according to claim 2 , wherein a rubber hardness h 1 of an inner tie rubber layer differs from a rubber hardness h 2 of an outer tie rubber layer, and the rubber hardness h 2 of the outer tie rubber layer is from 105% to 150% of the rubber hardness h 1 of the inner tie rubber layer.

4. The pneumatic tire according to claim 1 , wherein a rubber hardness h 1 of an inner tie rubber layer differs from a rubber hardness h 2 of an outer tie rubber layer, and the rubber hardness h 2 of the outer tie rubber layer is from 105% to 150% of the rubber hardness h 1 of the inner tie rubber layer.

5. The pneumatic tire according to claim 1 , wherein at least one of the end portions on the outermost sides terminates radially outwardly of a tire maximum width position of the pneumatic tire.

6. A pneumatic tire, comprising:
an annular-shaped tread portion where a mounting direction with regard to a vehicle is specified, and that extends in a tire circumferential direction;
a pair of sidewall portions disposed on both sides of the tread portion;
a pair of bead cores disposed on an inner side in a tire radial direction of the sidewall portions;
a carcass layer bridging between the pair of bead cores, the carcass layer being a single carcass layer and being the only carcass layer of the pneumatic tire, the carcass layer having a folded back end terminating radially inward of the tire maximum width position;
a belt layer being disposed on an outer circumferential side of the carcass layer in the tread portion;
an innerliner layer being disposed on a tire inner surface along the carcass layer; and
partial tie rubber layers being selectively disposed between the carcass layer and innerliner layer in a region on both sides in a tire width direction excluding a center region of the tread portion; wherein
end portions of the partial tie rubber layers on a tire equator side are disposed within a range of from 10 mm to 25 mm on the inner side in the tire width direction from an end portion on an outermost side in the tire width direction of the belt layers;
end portions of the partial tie rubber layers on outermost sides opposite the end portions on the tire equator side terminate radially outwardly of a radially outermost position of the bead cores;
a periphery length x 1 of an inner tie rubber layer disposed on a vehicle inner side being one of the partial tie rubbers differs from a periphery length x 2 of an outer tie rubber layer disposed on a vehicle outer side being the other of the partial tie rubbers;
a difference Δx between the periphery length x 2 of the outer tie rubber layer and the periphery length x 1 of the inner tie rubber layer is 0.25 times or less a periphery length X along a tire inner surface from a bead toe to a tire equator;
the periphery length x 1 is from 40 mm to 70 mm; and
the periphery length x 2 is from 50 mm to 80 mm.

7. The pneumatic tire according to claim 6 , wherein a rubber hardness h 1 of an inner tie rubber layer differs from a rubber hardness h 2 of an outer tie rubber layer, and the rubber hardness h 2 of the outer tie rubber layer is from 105% to 150% of the rubber hardness h 1 of the inner tie rubber layer.

8. The pneumatic tire according to claim 6 , wherein at least one of the end portions on the outermost sides terminates radially outwardly of a tire maximum width position of the pneumatic tire.

9. A pneumatic tire, comprising:
an annular-shaped tread portion where a mounting direction with regard to a vehicle is specified, and that extends in a tire circumferential direction;
a pair of sidewall portions disposed on both sides of the tread portion;
a pair of bead cores disposed on an inner side in a tire radial direction of the sidewall portions;
a carcass layer bridging between the pair of bead cores, the carcass layer being a single carcass layer and being the only carcass layer of the pneumatic tire, the carcass layer having a folded back end terminating radially inward of the tire maximum width position;
a belt layer being disposed on an outer circumferential side of the carcass layer in the tread portion;
an innerliner layer being disposed on a tire inner surface along the carcass layer; and
partial tie rubber layers being selectively disposed between the carcass layer and innerliner layer in a region on both sides in a tire width direction excluding a center region of the tread portion; wherein
end portions of the partial tie rubber layers on a tire equator side are disposed within a range of from 10 mm to 25 mm on the inner side in the tire width direction from an end portion on an outermost side in the tire width direction of the belt layers;
end portions of the partial tie rubber layers on outermost sides opposite the end portions on the tire equator side terminate radially outwardly of a radially outermost position of the bead cores;
a rubber hardness h 1 of an inner tie rubber layer disposed on a vehicle inner side being one of the partial tie rubbers differs from a rubber hardness h 2 of an outer tie rubber layer disposed on a vehicle outer side being the other of the partial tie rubbers;
the rubber hardness h 2 of the outer tie rubber layer is from 105% to 150% of the rubber hardness h 1 of the inner tie rubber layer;
the rubber hardness h 1 is from 55 to 65; and
the rubber hardness h 2 is from 70 to 90.

10. The pneumatic tire according to claim 9 , wherein at least one of the end portions on the out

Assignees

• Yokohama Rubber Co Ltd

Inventors

• Suzuki Takahiro

Classifications

• B60C2005/145

  made of laminated layers · CPC title

• B60C3/06 Primary

  asymmetric · CPC title

• B60C2009/145

  at the inner side of the carcass structure · CPC title

• B60C5/14 Primary

  with impervious liner or coating on the inner wall of the tyre · CPC title

• Y02T10/86

  Optimisation of rolling resistance, e.g. weight reduction · CPC title