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US 10,589,577 B2Granted
Heavy-duty pneumatic tire
AssigneeSumitomo Rubber Industries, Ltd.
InventorKaori Tanaka
Life of this patent
Estimating the term…
Abstract
A heavy-duty pneumatic tire includes a carcass ply including a main portion extending between bead cores and a pair of turn-up portions, a first reinforcing layer of a steel cord disposed in each bead portion in a U-shaped manner, and a second reinforcing layer of an organic fiber cord disposed in each bead portion and at least a part of the second reinforcing layer extending in a radial direction of the tire at an axially outward location of the first reinforcing layer. The second reinforcing layer includes an axially inner second ply and an outer second ply. The outer second ply has an inner end positioned below the bead core. The inner second ply has an inner end located axially inward of the inner end of the outer second ply, and has a substantially same length as the outer second ply in a tire cross-section.
Claims20
A heavy-duty pneumatic tire comprising:
- a tread portion;
- a pair of sidewall portions;
- a pair of bead portions each having a bead core therein, each bead core having a radially innermost end position thereof and an axially innermost end position thereof, each bead portion being provided with a bead apex rubber that extends radially outwardly from the bead core in a tapered manner and that includes an inner apex and an outer apex disposed radially outwardly of the inner apex;
- a carcass comprising a carcass ply comprising a main portion extending between the bead cores and a pair of turn-up portions each wound up around the bead core from axially inside to the outside of the tire;
- a first reinforcing layer of a steel cord disposed in each bead portion, the first reinforcing layer extending in a U-shaped manner to surround the bead core;
- and
- a second reinforcing layer of an organic fiber cord disposed in each bead portion, at least a part of the second reinforcing layer extending in a radial direction of the tire at an axially outward location of the first reinforcing layer, the second reinforcing layer comprising an inner second ply being in contact with the first reinforcing layer and an outer second ply being in contact with the inner second ply,
- wherein
- the outer second ply has an inner end positioned below the bead core,
- the inner second ply has an inner end located axially inward of the inner end of the outer second ply,
- the inner end of the inner second ply is located radially outward of the radially innermost end position of the bead core and located radially inward of the axially innermost end position of the bead core,
- the inner second ply has substantially the same length as the outer second ply in a tire cross-section,
- in each bead portion, the inner apex has a substantially triangular cross-section extending from the bead core to a radially outer end thereof which is located radially outward of a radially outer end of the turn-up portion,
- the inner apex has a complex modulus E*1 of from 40 to 65 MPa,
- the outer apex is superimposed on the inner apex through a boundary extending radially inwardly from the radially outer end of the inner apex to the turn-up portion, and
- the outer apex has a complex modulus E*2 in a range of from 3 to 5 MPa.
13 more elements
A heavy-duty pneumatic tire comprising:
- a tread portion;
- a pair of sidewall portions;
- a pair of bead portions each having a bead core therein, each bead core having a radially innermost end position thereof and an axially innermost end position thereof;
- a carcass comprising a carcass ply comprising a main portion extending between the bead cores and a pair of turn-up portions each wound up around the bead core from axially inside to the outside of the tire;
- a first reinforcing layer of a steel cord disposed in each bead portion, the first reinforcing layer extending in a U-shaped manner to surround the bead core;
- and
- a second reinforcing layer of an organic fiber cord disposed in each bead portion, at least a part of the second reinforcing layer extending in a radial direction of the tire at an axially outward location of the first reinforcing layer, the second reinforcing layer comprising an inner second ply being in contact with the first reinforcing layer and an outer second ply being in contact with the inner second ply,
- wherein
- the outer second ply has an inner end positioned below the bead core,
- the inner second ply has an inner end located axially inward of the inner end of the outer second ply,
- the inner end of the inner second ply is located radially outward of the radially innermost end position of the bead core and located radially inward of the axially innermost end position of the bead core,
- the inner second ply has substantially the same length as the outer second ply in a tire cross-section;
- a chafer rubber disposed in each bead portion, wherein
- the chafer rubber is disposed axially outward of the second reinforcing layer and extends radially inwardly of the bead core so that the chafer rubber is configured to be in contact with a rim seat when the tire is mounted on a rim,
- the chafer rubber has a radially outer end which is located radially outward of a radially outer end of the outer second ply,
- the chafer rubber has a minimum thickness of at an axially outer region of the bead core in a range of from 2.5 to 6.0 mm, and
- the chafer rubber has a complex modulus E*3 in a range of from 7 to 14 MPa.
14 more elements
A heavy-duty pneumatic tire comprising:
- a tread portion;
- a pair of sidewall portions;
- a pair of bead portions each having a bead core therein, each bead core having a radially innermost end position thereof and an axially innermost end position thereof;
- a carcass comprising a carcass ply comprising a main portion extending between the bead cores and a pair of turn-up portions each wound up around the bead core from axially inside to the outside of the tire;
- a first reinforcing layer of a steel cord disposed in each bead portion, the first reinforcing layer extending in a U-shaped manner to surround the bead core;
- a second reinforcing layer of an organic fiber cord disposed in each bead portion, at least a part of the second reinforcing layer extending in a radial direction of the tire at an axially outward location of the first reinforcing layer, the second reinforcing layer comprising an inner second ply being in contact with the first reinforcing layer and an outer second ply being in contact with the inner second ply,
- wherein
- the outer second ply has an inner end positioned below the bead core,
- the inner second ply has an inner end located axially inward of the inner end of the outer second ply,
- the inner end of the inner second ply is located radially outward of the radially innermost end position of the bead core and located radially inward of the axially innermost end position of the bead core, and
- the inner second ply has substantially the same length as the outer second ply in a tire cross-section.
8 more elements
Dependencies are inferred from the claim text.