Sumitomo Rubber Industries Patente

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Provided is a tire having improved braking performance while maintaining noise performance. The tire includes a tread portion 2 having a designated rotation direction R. The tread portion 2 includes a first tread end T1, first inclined grooves 5, and first land portions 7. Each of the first inclined grooves 5 includes a first groove wall 11 on a leading edge side in the rotation direction R and a second groove wall 12 on a trailing edge side in the rotation direction R. A first chamfered portion 13 is formed on the first groove wall 11, and a second chamfered portion 14 is formed on the second groove wall 12. In a cross-section orthogonal to a groove center line of the first inclined groove 5, a chamfered area S1 of the first chamfered portion 13 is larger than a chamfered area S2 of the second chamfered portion 14.

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A heavy duty tire 2 includes a tread 4 having a plurality of circumferential grooves 24. The plurality of circumferential grooves 24 divide the tread 4 into a plurality of land portions 26. The plurality of land portions 26 include a plurality of main land portions 32. Each main land portion 32 has a plurality of main lateral grooves 38. The plurality of main lateral grooves 38 divide the main land portion 32 into a plurality of main blocks 40. Each main lateral groove 38 includes a lateral groove body 54 and a bottom sipe portion 56. Each main block 40 has a transverse sipe 70. The transverse sipe 70 includes a sipe body 72 and a tubular portion 74. A circumferential groove 24 located between the adjacent main land portions 38 is a circumferential narrow groove 28 including a body portion 78 and an enlarged width portion 80.

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Provided is a heavy-duty tire that exhibits favorable chipping resistance and wear resistance during running on a bad road surface. The heavy-duty tire has a tread formed from a rubber composition containing a rubber component that includes 25 to 70% by mass of an isoprene-based rubber, 10 to 30% by mass of a butadiene rubber, and 20 to 55% by mass of a styrene-butadiene rubber, the rubber composition further containing, per 100 parts by mass of the rubber component, 10 to 70 parts by mass of a carbon black having a nitrogen adsorption specific surface area not less than 130 m<2>/g, wherein a ground-contact surface shape formed when the tread is pressed against a flat surface by application of a normal load in a normal state where the heavy-duty tire is mounted to a normal rim and inflated to a normal internal pressure and no load is applied to the heavy-duty tire, satisfies formulae (1) and (2): 1.05 ≤ SL 0 / SL 70 ≤ 1.15 <img class="EMIRef" id="669406048-ia01" /> 0.95 ≤ SL 70 / SL 97 ≤ 1.05 <img class="EMIRef" id="669406048-ia02" /> where SL0 represents a ground-contact length in a tire circumferential direction on a tire equator, SL70 represents a ground-contact length in the tire circumferential direction at a position that is apart from the tire equator in a tire axial direction by a distance that is 70% of a half ground-contact width of the tread, and SL97 represents a ground-contact length in the tire circumferential direction at a position that is apart from the tire equator in the tire axial direction by a distance that is 97% of the half ground-contact width of the tread.

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An object of the present disclosure is to provide a tire having improved overall performance of an initial grip performance and a peak grip performance on a dry road surface. Provided is a tire comprising a tread part, the tread part having two or more circumferential grooves extending continuously in a tire circumferential direction, a pair of shoulder land parts partitioned by the circumferential grooves and grounding ends, a center land part located between the pair of shoulder land parts, and a width direction groove, wherein a land ratio R on a grounding surface of the tread part is 0.50 to 0.80, wherein the tread part has at least one rubber layer consisting of a rubber composition comprising a rubber component, and wherein an average value tan δA of a loss tangent tan δ of the rubber composition at -15°C to 20°C, measured under a condition of a frequency of 10 Hz, an initial strain of 0.1%, and a dynamic strain amplitude of ± 0.25%, is 0.40 to 0.60.

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Provided is a tire capable of improving steering stability on a dry road surface and on-snow performance. A tire 1 includes a buttress surface 13 extending inward in a tire radial direction from a tread ground-contact end Te. The tire 1 has a plurality of line grooves 15 recessed inward from the buttress surface 13 and extending on the buttress surface 13 and a plurality of ridges 16 protruding outward from the buttress surface 13 and extending on the buttress surface 13. The line grooves 15 and the ridges 16 are alternately arranged.

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