Tire
AssigneeThe Yokohama Rubber Co., Ltd.
InventorsHaruka Tateno, Hiraku Koda, Masayuki Fujishiro
Life of this patent
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Abstract
A tire includes bead cores, a carcass layer extended across the bead cores, a belt layer on a radially outer side of the carcass layer, and a tread portion. The tire outer diameter OD (mm) satisfies 200≤OD≤660. The total tire width SW (mm) satisfies 100≤SW≤400. A groove area ratio Aa (%) of the tread portion satisfies 0.008≤Aa/OD≤0.150. When a region of 48×(OD/SW){circumflex over ( )}(1/5) (%) from a maximum ground contact width end portion on a tire inner side when the tire is mounted on a vehicle is defined as a tire inner region of the tread portion, a groove area ratio Ai (%) of the tire inner region and a groove area ratio Ao (%) of a tire outer region as a region other than the tire inner region have a relationship Ai>Ao.
Claims13
A tire, comprising:
- a pair of bead cores;
- a carcass layer extended across the bead cores;
- a belt layer disposed on an outer side of the carcass layer in a radial direction;
- and
- a tread portion;
- a tire outer diameter OD (mm) being in a range 200≤OD≤660,
- a total tire width SW (mm) being in a range 100≤SW≤400,
- a groove area ratio Aa (%) of the tread portion being in a range 0.008≤Aa/OD≤0.150,
- when a region of 48×(OD/SW){circumflex over ( )}(1/5) (%) from a maximum ground contact width end portion on a tire inner side when the tire is mounted on a vehicle is defined as a tire inner region of the tread portion, a groove area ratio Ai (%) of the tire inner region and a groove area ratio Ao (%) of a tire outer region as a region other than the tire inner region have a relationship Ai>Ao, and
- an average pitch number Pi (piece) (Pi is a natural number) within a tire ground contact length in the tire inner region satisfying SW/70≤Pi≤SW/15 with respect to the total width SW.
A tire, comprising:
- a pair of bead cores;
- a carcass layer extended across the bead cores;
- a belt layer disposed on an outer side of the carcass layer in a radial direction;
- and
- a tread portion;
- a tire outer diameter OD (mm) being in a range 200≤OD≤660,
- a total tire width SW (mm) being in a range 100≤SW≤400,
- a groove area ratio Aa (%) of the tread portion being in a range 0.008≤Aa/OD≤0.150, and
- when a region of 48×(OD/SW){circumflex over ( )}(1/5) (%) from a maximum ground contact width end portion on a tire inner side when the tire is mounted on a vehicle is defined as a tire inner region of the tread portion, a groove area ratio Ai (%) of the tire inner region and a groove area ratio Ao (%) of a tire outer region as a region other than the tire inner region have a relationship Ai>Ao;
- wherein
- a groove area ratio Ai30 in a region from a ground contact edge on a tire inner side of the tread portion to 30% of a ground contact width is in a range 5≤Ai30≤50,
- a groove area ratio Ao30 in a region from a ground contact edge on a tire outer side of the tread portion to 30% of a ground contact width is in a range 0≤Ao30≤40,
- a ratio Ao30/Ai30 of the groove area ratio Ai30 to the groove area ratio Ao30 is in a range 1≤Ai30/Ao30≤10,
- a maximum groove depth Gmax (mm) of the entire tread portion satisfies 3+ (250/OD)≤Gmax≤25+ (250/OD),
- a ratio Ai/Ao of the groove area ratio Ai to the groove area ratio Ao satisfies 1<Ai/Ao≤9.0+ (200/OD),
- a ratio Gi/Go of a maximum groove depth Gi (mm) of the tire inner region to a maximum groove depth Go (mm) of the tire outer region satisfies 0.4≤Gi/Go≤1.6,
- the tread portion has a circumferential main groove extending in a tire circumferential direction,
- the circumferential main groove has a groove width of 3 mm or more,
- a projected area C (mm2) of the circumferential main groove satisfies 0.03≤C/(SW×OD)≤1.01, and
- an average pitch number Pi (piece) (Pi is a natural number) within a tire ground contact length in the tire inner region satisfies SW/70≤Pi≤SW/15 with respect to the total width SW.
Dependencies are inferred from the claim text.