Pneumatic tire
AssigneeThe Yokohama Rubber Co., Ltd.
InventorMasatoshi SHIMIZU
Life of this patent
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Abstract
A pneumatic tire includes a serration region provided in a predetermined region of a sidewall portion, the serration region being formed by arranging a plurality of ridges, the plurality of ridges protruding from a base surface in parallel to each other and periodically, when a length along a contour of the ridge per cycle in a cross-sectional view along a direction orthogonal to an extension direction of the plurality of ridges is defined as a length Lr and a length of one cycle of the plurality of ridges along the base surface is defined as a length Lb, a ratio (Lr/Lb) of the length Lr to the length being 1.2 or more and 2.0 or less, and the length Lb being 0.5 mm or more and 0.7 mm or less.
Claims20
A pneumatic tire comprising a tread portion;
- a sidewall portion;
- and a bead portion,
- a serration region being provided in a predetermined region of the sidewall portion,
- the serration region being formed by arranging a plurality of ridges,
- the plurality of ridges protruding from a base surface in parallel to each other and periodically, when a length along a contour of the ridge per cycle in a cross-sectional view along a direction orthogonal to an extension direction of the plurality of ridges is defined as a length Lr and a length of one cycle of the plurality of ridges along the base surface is defined as a length Lb, a ratio Lr/Lb of the length Lr to the length Lb being 1.2 or more and 2.0 or less, and
- the length Lb being 0.5 mm or more and 0.7 mm or less.
A pneumatic tire comprising a tread portion;
- a sidewall portion;
- and a bead portion,
- a serration region being provided in a predetermined region of the sidewall portion,
- the serration region being formed by arranging a plurality of ridges,
- the plurality of ridges protruding from a base surface in parallel to each other and periodically,
- a length Lb of one cycle of the plurality of ridges along the base surface being 0.5 mm or more and 0.7 mm or less,
- in a cross-sectional view along a direction orthogonal to an extension direction of the plurality of ridges,
- a plurality of recess portions being provided on a top surface of each of the plurality of ridges,
- a bottom flat portion with no unevenness being provided on a bottom surface of the recess portion,
- an inter-recess flat portion with no unevenness being provided between the recess portions that are adjacent, and
- a ratio H2/H1 of a height H2 from the base surface to the inter-recess flat portion to a height H1 from the base surface to the bottom flat portion being 1.2 or more and 1.6 or less.
Dependencies are inferred from the claim text.