Pneumatic Tire
AssigneeThe Yokohama Rubber Co., Ltd.
InventorKeisuke Nakazaki
Life of this patent
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Abstract
A pneumatic tire has a belt cross-sectional width BW as a total width in a tire width direction of a belt layer and a distance Wl as a distance in the tire width direction from an edge on the tread portion side of a run flat liner to an edge of the belt layer. The belt cross-sectional width BW and the distance Wl are such that 0.25≦Wl/(BW/2)≦0.45 is satisfied. A thickness Wr in each of the side wall portions of the pneumatic tire is a thickness in the tire width direction of the run flat liner at a maximum width position, a thickness Ws is a thickness in the tire width direction of a rubber layer at the maximum width position, and the thickness Wr and the thickness Ws are such that 1.2≦Wr/Ws≦1.9 is satisfied.
Claims18
A pneumatic tire for assembly on a rim comprising a tread portion, a pair of shoulder portions provided on both sides of the tread portion, a pair of side walls linked respectively to the pair of shoulder portions, and a pair of bead portions linked respectively to the pair of side wall portions;
- the pneumatic tire further comprising:
- a carcass layer provided across the pair of bead portions from the tread portion through the pair of shoulder portions and the pair of side wall portions,
- a belt layer provided outward of the carcass layer in the tread portion,
- a rubber layer provided outward of the carcass layer and the belt layer,
- a pair of run flat liners provided inward of the carcass layer in the side wall portions, and
- an inner liner provided inward of the carcass layer and the run flat liner;
- wherein
- an angle θ1 is an angle formed by a first connecting line that connects a tire outer circumferential surface on a tire equator line passing through a center point of a tire cross-sectional width and the tire outer circumferential surface in a ground contact edge, and a first straight line extending in a tire width direction from the tire outer circumferential surface on the tire equator line,
- an angle θ2 is an angle formed by a second connecting line that connects the tire outer circumferential surface on the tire equator line and the tire outer circumferential surface on a straight line extending in a tire radial direction through a center point of the first connecting line, and the first straight line,
- the angle θ1 and the angle θ2 are such that 3.0≦θ1/θ2≦6.0 is satisfied,
- a belt cross-sectional width BW is a total width in the tire width direction of the belt layer,
- a distance Wl on one side of the tire equator line is a distance in the tire width direction from an edge on the tread portion side of the run flat liner to an edge of the belt layer,
- the belt cross-sectional width BW and the distance Wl are such that 0.25≦Wl/(BW/2)≦0.45 is satisfied,
- a thickness Wr in each of the side wall portions is a thickness in the tire width direction of the run flat liner at a maximum width position where a tire width is greatest,
- a thickness Ws in each of the side wall portions is a thickness in the tire width direction of the rubber layer at the maximum width position where the tire width is greatest, and
- the thickness Wr and the thickness Ws are such that 1.2≦Wr/Ws≦1.9 is satisfied.
Dependencies are inferred from the claim text.