Pneumatic tire

Patent metadata

Field	Value
Publication number	US-10406867-B2
Application number	US-201615260985-A
Country	US
Kind code	B2
Filing date	Sep 9, 2016
Priority date	Sep 28, 2015
Publication date	Sep 10, 2019
Grant date	Sep 10, 2019

Abstract

A pneumatic tire that includes a pair of bead cores, a pair of bead fillers connected to the bead cores respectively, a ply which extends between the bead cores; steel chafers disposed outside the ply, and inner nylon chafers disposed outside the steel chafers. The inner nylon chafers extend upward from positions in the vicinity of heels of the bead cores. The pneumatic tire also includes outer nylon chafers are disposed outside the inner nylon chafer.

First claim

What is claimed is:

1. A pneumatic tire comprising:
a pair of bead portions, and
a ply which extends between the pair of bead portions;
each of the pair of bead portions comprising;
a bead core;
a bead filler connected to the bead core;
one end side of the ply disposed along an outer surface of the bead core;
a steel chafer disposed outside the ply;
an inner nylon chafer disposed outside the steel chafer, the inner nylon chafer extending upward from a position in the vicinity of heels of the bead core; and
an outer nylon chafer disposed outside the inner nylon chafer, wherein
assuming a distance from a reference position of the bead core to an outer end portion of the steel chafer as H 1 , a distance from the reference position of the bead core to an outer end portion of the ply as H 2 , a distance from the reference position of the bead core to an outer end portion of the outer nylon chafer as H 3 , a distance from the reference position of the bead core to an inner end portion of the steel chafer as H 4 , and a distance from the reference position of the bead core to the upper end portion of the inner nylon chafer as H 5 , a following relationship is satisfied:
H1<H2<H3<H4<H5,

wherein all of following relationships are satisfied:
0.50× H 2≤ H 1≤0.70× H 2,

1.10× H 2≤ H 3≤1.40× H 2,

1.35× H 2— H 4≤1.60× H 2,

1.15× H 2≤ H 5≤1.40× H 2, and

1.40× H 2≤ H 6≤1.65× H 2

2. The pneumatic tire according to claim 1 , further comprising an outer rubber layer outside of the outer nylon chafer, wherein
assuming a shortest distance between an inner edge of the upper end portion of the inner nylon chafer and an inner surface of the bead filler continuously formed with the bead core as T 3 , and a shortest distance between an outer edge of the upper end portion of the inner nylon chafer and an outer surface of the outer rubber layer as T 4 , a following relationship is satisfied:
1.1× T 3< T 4<1.5× T 3.

3. The pneumatic tire according to claim 1 , wherein
a rubber layer is disposed between the bead filler and the inner nylon chafer,
assuming a distance from the reference position of the bead core to the inner end portion of the outer nylon chafer as H 6 , the distance H 5 is substantially equal to the distance H 6 , and
assuming a distance from the outer end portion of the outer nylon chafer to an upper end portion of the rubber layer as H 7 , a following relationship is satisfied:
2.5× H 7≤ H 5( H 6)≤3.0× H 7.

4. The pneumatic tire according to claim 1 , wherein
assuming a height of the tire as H, a following relationship is satisfied:
0.10× H≤H 2≤0.25× H.

5. The pneumatic tire according to claim 1 , further comprising an outer rubber layer outside of the outer nylon chafer, wherein
assuming a shortest distance between an inner edge of the outer end portion of the outer nylon chafer and an inner surface of the bead filler as T 1 , and a shortest distance between an outer edge of the outer end portion of the outer nylon chafer and an outer surface of the outer rubber layer as T 2 , a following relationship is satisfied:
1.5× T 2< T 1<2.0× T 2.

6. The pneumatic tire according to claim 5 , further comprising an outer rubber layer outside of the outer nylon chafer, wherein
assuming a shortest distance between an inner edge of the upper end portion of the inner nylon chafer and an inner surface of the bead filler continuously formed with the bead core as T 3 , and a shortest distance between an outer edge of the upper end portion of the inner nylon chafer and an outer surface of the outer rubber layer as T 4 , a following relationship is satisfied:
1.1× T 3< T 4<1.5× T 3.

7. The pneumatic tire according to claim 5 , wherein
a rubber layer is disposed between the bead filler and the inner nylon chafer,
assuming a distance from the reference position of the bead core to the inner end portion of the outer nylon chafer as H 6 , the distance H 5 is substantially equal to the distance H 6 , and
assuming a distance from the outer end portion of the outer nylon chafer to an upper end portion of the rubber layer as H 7 , a following relationship is satisfied:
2.5× H 7≤ H 5( H 6)≤3.0× H 7.

8. The pneumatic tire according to claim 5 , wherein
assuming a height of the tire as H, a following relationship is satisfied:
0.10× H≤H 2≤0.25× H.

Assignees

• Toyo Tire & Rubber Co
• Toyo Tire Corp

Inventors

• Izuhara Yuji

Classifications

• B60C2015/0621

  adjacent to the carcass turnup portion · CPC title

• B60C15/0635

  using chippers between the carcass layer and chafer rubber wrapped around the bead · CPC title

• B60C2200/06

  for heavy duty vehicles · CPC title

• B60C2015/061

  Dimensions of the bead filler in terms of numerical values or ratio in proportion to section height · CPC title

• B60C2015/0614

  characterised by features of the chafer or clinch portion, i.e. the part of the bead contacting the rim · CPC title