Back to results
US 12,447,774 B2Granted
Tire
AssigneeSumitomo Rubber Industries, Ltd.
InventorYohei Maeda
Life of this patent
Estimating the term…
Abstract
A tire includes a tread portion having a ground contacting surface and a first groove. A tread rubber forming the tread portion includes a first rubber layer and a second rubber layer. The second rubber layer has a complex elastic modulus smaller than a complex elastic modulus of the first rubber layer. The first groove includes a first groove edge, a groove bottom surface, and a first groove wall. In a lateral cross section of the first groove, the first groove wall includes a first wide top portion arranged between the first groove edge and the groove bottom surface and located outside the first groove edge in a groove width direction of the first groove. The first wide top portion is positioned in the second rubber layer.
Claims20
A tire comprising a tread portion and having a tire equator, wherein
- the tread portion includes a ground contacting surface, and at least one first groove opening at the ground contacting surface,
- the tread portion is formed from a tread rubber that includes a first rubber layer not exposed at the ground contacting surface and a second rubber layer connected to the first rubber layer on an outer side in a tire radial direction,
- the second rubber layer has a complex elastic modulus E*2 smaller than a complex elastic modulus E*1 of the first rubber layer,
- the or each first groove has a groove width decreasing from a respective one of tread edges toward the tire equator and includes a first groove edge that is one of two groove edges of the or each first groove appearing on the ground contacting surface, a groove bottom surface located radially inside the second rubber layer, and a first groove wall connecting the first groove edge and the groove bottom surface,
- in a lateral cross section of the or each first groove, the first groove wall includes a first wide top portion between the first groove edge and the groove bottom surface,
- the first wide top portion is located outside the first groove edge in a groove width direction of the or each first groove, and
- the first wide top portion is positioned in the second rubber layer.
4 more elements
A tire comprising a tread portion, wherein
- the tread portion includes a ground contacting surface, and at least one first groove opening at the ground contacting surface,
- the tread portion is formed from a tread rubber that includes a first rubber layer not exposed at the ground contacting surface and a second rubber layer connected to the first rubber layer on an outer side in a tire radial direction,
- the second rubber layer has a complex elastic modulus E*2 smaller than a complex elastic modulus E*1 of the first rubber layer,
- the or each first groove includes a first groove edge that is one of two groove edges of the or each first groove appearing on the ground contacting surface, a groove bottom surface located radially inside the second rubber layer, and a first groove wall connecting the first groove edge and the groove bottom surface,
- in a lateral cross section of the or each first groove, the first groove wall includes a first wide top portion between the first groove edge and the groove bottom surface,
- the first wide top portion is located outside the first groove edge in a groove width direction of the or each first groove,
- the first wide top portion is positioned in the second rubber layer, and
- a depth from the ground contacting surface to a boundary between the first rubber layer and the second rubber layer is from 85% to 90% of a maximum depth of the or each first groove.
5 more elements
A tire comprising a tread portion, wherein
- the tread portion includes a ground contacting surface, and at least one first groove opening at the ground contacting surface,
- the tread portion is formed from a tread rubber that includes a first rubber layer not exposed at the ground contacting surface, a second rubber layer connected to the first rubber layer on an outer side in a tire radial direction, and a third rubber layer connected to the second rubber layer and forming the ground contacting surface,
- the second rubber layer has a complex elastic modulus E*2 smaller than a complex elastic modulus E*1 of the first rubber layer,
- the third rubber layer has a complex elastic modulus E*3 smaller than the complex elastic modulus E*1 of the first rubber layer and larger than the complex elastic modulus E*2 of the second rubber layer,
- the or each first groove includes a first groove edge that is one of two groove edges of the or each first groove appearing on the ground contacting surface, a groove bottom surface located radially inside the second rubber layer, and a first groove wall connecting the first groove edge and the groove bottom surface,
- in a lateral cross section of the or each first groove, the first groove wall includes a first wide top portion between the first groove edge and the groove bottom surface,
- the first wide top portion is located outside the first groove edge in a groove width direction of the or each first groove,
- the first wide top portion is positioned in the second rubber layer, and
- the groove bottom surface is located in the first rubber layer.
6 more elements
Dependencies are inferred from the claim text.