Tire

Patent metadata

Field	Value
Publication number	US-9902213-B2
Application number	US-201113814418-A
Country	US
Kind code	B2
Filing date	Aug 5, 2011
Priority date	Aug 6, 2010
Publication date	Feb 27, 2018
Grant date	Feb 27, 2018

Abstract

Disclosed is a tire ( 1 ) which comprises: a bead core ( 10 ); a first bead filler ( 20 ); a first carcass ( 30 ); a second bead filler ( 40 ); and a rubber chafer ( 50 ) disposed at the outer side of the second bead filler ( 40 ) in the tread width direction. The second bead filler ( 40 ) covers a first bead filler outer end part ( 23 ) in the tread width direction, and a second bead filler inner end part ( 48 ) is disposed outside the bead core ( 10 ) in the tire radius direction. The rubber chafer ( 50 ) covers the second bead filler ( 40 ) in the tread width direction, and the loss tangent of the second bead filler ( 40 ) is smaller than the loss tangent of the rubber chafer ( 50 ).

First claim

The invention claimed is:

1. A tire having a bead unit, comprising;
a pair of bead cores;
a pair of first bead fillers arranged at an outer side in a tire radial direction of the bead cores;
a first carcass extending between the pair of bead cores and the pair of first bead fillers, and curved to an outer side in a tread width direction to roll up the bead cores and the first bead fillers, the first carcass having, at each side in the tread width direction, an inner carcass positioned at an inner side in the tread width direction and an outer carcass curved to the outer side in the tread width direction;
a second bead filler arranged at the outer side in the tread width direction, from the outer carcass of the first carcass curved to the outer side in the tread width direction;
a rubber chafer arranged at the outer side in the tread width direction of the second bead filler;
a second carcass arranged between the first carcass and the second bead filler in the tread width direction; and
a chafer extended between the first carcass and the second carcass in the tread width direction through a surface of an inner end portion in the tire radial direction of the bead unit from an inner surface in the tread width direction of the bead unit,
wherein, at each side of the tire in the tread width direction,
the second bead filler covers an end portion of the outer side in the tire radial direction, of the first bead filler in the tread width direction,
an end portion of the inner side in the tire radial direction, of the second bead filler is arranged at the outer side in the tire radial direction from the bead core, such that the second bead filler is entirely positioned at the outer side in the tire radial direction front the bead core;
the rubber chafer contacts with the second bead filler to cover an entirety of the second bead filler in the tread width direction,
a loss tangent of the second bead filler is smaller than a loss tangent of the rubber chafer, and
an outer carcass outer front end, which is an outermost end in the tire radial direction of the outer carcass of the first carcass, makes contact with the inner carcass of the first carcass.

2. The tire according to claim 1 , wherein
in a cross section along the tire radial direction and the tread width direction in a state in which the tire is mounted in a normal rim having a rim flange, the tire has a normal inner pressure and a normal load is applied to the tire,
a height along the tire radial direction from a bead core-innermost surface to an outer front end of the second bead filler, the outer front end of the second bead filler being an outermost end of the second bead filler in the tire radial direction, is equal to or more than 1.3 times and equal to or less than 3.0 times of a height along the tire radial direction from the bead core-innermost surface to a rim flange-outermost surface, the bead core-innermost surface being an innermost surface of the bead core in the tire radial direction, the rim flange-outermost surface being an outermost surface of the rim flange in the tire radial direction.

3. The tire according to claim 1 , wherein
in a cross section along the tire radial direction and the tread width direction in a state in which the tire is mounted in a normal rim having a rim flange, the tire has a normal inner pressure and a normal load is applied to the tire,
an end portion of the rubber chafer at the outer side in the tire radial direction approaches the inner side in the tire radial direction as it goes toward the outer side in the tread width direction.

4. The tire according to claim 1 , wherein
the tire comprises a nylon cord layer that surrounds the bead cores toward the outer side in the tire radial direction from the inner side in the tire radial direction between the bead cores and the first carcass,
in a cross section along the tire radial direction and the tread width direction in a state in which the tire is mounted in a normal rim having a rim flange, the tire has a normal inner pressure and a normal load is applied to the tire,
the nylon cord layer has an outer nylon cord layer positioned at the outer side in the tread width direction from the bead cores, and
a height along the tire radial direction from a bead core-innermost surface to an outer front end of the outer nylon cord layer, the outer frond end of the outer nylon cord layer being an outermost end of the outer nylon cord layer in the tire radial direction, is equal to or more than 0.5 times and less than 1.3 times of a height along the tire radial direction from the bead core-innermost surface to a rim flange-outermost surface, the bead core-innermost surface being the innermost surface of the bead core in the tire radial direction, the rim flange-outermost surface being the outermost surface of the rim flange in the tire radial direction.

5. The tire according to claim 1 , wherein
in a cross section along the tire radial direction and the tread
width direction in a state in which the tire is mounted in a normal rim having a rim flange, the tire has a normal inner pressure and a normal load is applied to the tire,
a height along the tire radial direction from a bead core-innermost surface to an outer front end of the first bead filler, the outer front end of the first bead filler being an outermost end of the first bead filler in the tire radial direction, is equal to or more than 1.3 times and equal to or less than 3.0 times of a height along the tire radial direction from the bead core-innermost surface to a rim flange-outermost surface, the bead core-innermost surface being the innermost surface of the bead core in the tire radial direction, the rim flange-outermost surface being the outermost surface of the rim flange in the tire radial direction.

6. The tire according to claim 1 , wherein
in a cross section along the tire radial direction and the tread width direction in a state in which the tire is mounted in a normal rim having a rim flange, the tire has a normal inner pressure and a normal load is applied to the tire,
a height along the tire radial direction from a bead core-innermost surface to the outer carcass outer front end of the outer carcass in the tire radial direction is higher than a height along the tire radial direction from the bead core-innermost surface to an outer front end of the second bead filler, the outer frond end of the second bead filler being an outermost end of the second bead filler in the tire radial direction, the bead core-innermost surface being the innermost surface of the bead core in the tire radial direction.

7. The tire according to claim 1 , wherein the outer carcass outer front end is located on an outer side from the rubber chafer in the tire radial direction.

8. The tire according to claim 1 , further comprising a sidewall portion, wherein an outer end portion in the tire radial direction of the second carcass is positioned at the side wall portion.

9. The tire according to claim 1 ,
wherein in a cross section along the tire radial direction and the tread width direction in a state in which the tire is mounted in a normal rim having a rim flange, the tire has a normal inner pressure and a normal load is applied to the tire, and
wherein an inner end portion in the tire radial direction of the second carcass is positioned between the rim flange and the bead core in the tire width direction.

10. The tire according to claim 1 ,
wherein in a cross section along the tire radial direction and the tread width direction in a state in which the tire is mounted in a normal rim having a rim flange, the tire has a normal inner pressure and a normal load is applied to the tire, and
wherein an end portion of t

Assignees

• Amano Masakazu
• Yabashi Masahiro
• Bridgestone Corp

Inventors

• Amano Masakazu
• Yabashi Masahiro

Classifications

• B60C15/0607

  comprising several parts, e.g. made of different rubbers · CPC title

• B60C15/06 Primary

  Flipper strips, fillers, or chafing strips {and reinforcing layers for the construction of the bead} · CPC title

• B60C2015/0621

  adjacent to the carcass turnup portion · CPC title

• B60C15/0603

  characterised by features of the bead filler or apex · CPC title

• B60C15/0018

  not folded around the bead core, e.g. floating or down ply · CPC title