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US 10,894,444 B2Granted
Pneumatic tire
AssigneeSumitomo Rubber Industries, Ltd.
InventorYu Mukai
Life of this patent
Estimating the term…
Abstract
In a tire 2, a band 14 has a helically wound structure in which a strip 26 having a cord 28 is wound in a circumferential direction. The band 14 includes a center portion C disposed at a center in an axial direction, and a shoulder portion S disposed outward of the center portion C in the axial direction. A pitch Pc of the strip 26 in the center portion C is not less than 2.0 times a width W of the strip 26 and not greater than 2.5 times the width W. A pitch Ps of the strip 26 in the shoulder portion S is not less than 0.8 times the width W of the strip 26 and not greater than 1.2 times the width W.
Claims7
A pneumatic tire comprising:
- a tread that forms a tread surface which comes into contact with a road surface;
- and
- a band disposed inward of the tread in a radial direction, wherein
- the band has a helically wound structure in which a strip having a cord is wound in a circumferential direction,
- the band includes a center portion disposed at a center in an axial direction, and a shoulder portion disposed outward of the center portion in the axial direction,
- a pitch Pc of the strip in the center portion is not less than 2.0 times a width W of the strip and not greater than 2.5 times the width W,
- a pitch Ps of the strip in the shoulder portion is not less than 0.8 times the width W of the strip and not greater than 1.2 times the width W,
- on a cross-section perpendicular to the circumferential direction, a profile of the tread surface has a first arc C1 that intersects an equator plane, and a second arc C2 that contacts with the first arc C1,
- a ratio (R1/R2) of a curvature radius R1 of the first arc C1 to a curvature radius R2 of the second arc C2 is not less than 210% and not greater than 250%, and
- when A represents a contact point at which the first arc C1 and the second arc C2 contact with each other, and
- the contact point A is disposed outward of a boundary of the center portion and the shoulder portion in an axial direction.
8 more elements
A pneumatic tire comprising:
- a tread that forms a tread surface which comes into contact with a road surface;
- and
- a band disposed inward of the tread in a radial direction;
- and
- a belt disposed inward of the band in a radial direction, wherein
- the band has a helically wound structure in which a strip having a cord is wound in a circumferential direction,
- the band includes a center portion disposed at a center in an axial direction, and a shoulder portion disposed outward of the center portion in the axial direction,
- a pitch Pc of the strip in the center portion is not less than 2.1 times a width W of the strip and not greater than 2.3 times the width W,
- a pitch Ps of the strip in the shoulder portion is not less than 0.8 times the width W of the strip and not greater than 1.2 times the width W,
- an outer end of the band is disposed outward of a corresponding outer end of the belt in an axial direction,
- the band is a full band formed from one layer,
- on a cross-section perpendicular to the circumferential direction, a profile of the tread surface has a first arc C1 that intersects an equator plane, and a second arc C2 that contacts with the first arc C1,
- a ratio (R1/R2) of a curvature radius R1 of the first arc C1 to a curvature radius R2 of the second arc C2 is not less than 210% and not greater than 220%,
- the tread has grooves formed therein,
- when A represents a contact point at which the first arc C1 and the second arc C2 contact with each other, the contact point A is disposed outward of a boundary of the center portion and the shoulder portion in an axial direction;
- a width Ls of the shoulder portion is not less than 16% of a width Lb of the band and not greater than 30% of the width Lb, in the axial direction;
- the pitch Pc of the strip in the center portion is uniform;
- and
- a ratio (Wa/Wt) of a distance Wa from the equator plane to the contact point A in the axial direction, relative to a width Wt of the tread in the axial direction is not less than 30% and not greater than 40%.
16 more elements
Dependencies are inferred from the claim text.