Sumitomo Rubber Industries Patente

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Provided is a tire that can improve handling performance.A motorcycle tire 1 includes a tread portion 2 configured to be curved into an arc shape that projects outward in a tire radial direction. The tread portion 2 has a carcass 6 and a tread reinforcing layer 7 thereinside. The tread reinforcing layer 7 is formed by a rubber-coated cord strip 10 being helically wound. The tread reinforcing layer 7 includes a crown region Cr and shoulder regions Sh. The rubber-coated cord strip 10 includes a plurality of reinforcing cords 11 aligned with each other. A distance Ws between the reinforcing cords 11 and 11 which are adjacent to each other in the rubber-coated cord strip 10 wound in each of the shoulder regions Sh is less than a distance Wc between the reinforcing cords 11 and 11 which are adjacent to each other in the rubber-coated cord strip 10 wound in the crown region Cr. Shoulder ends Es are not less than crown ends Ec.

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<div notation="docdba" type="abstract" xml:base="/api/emi/section/ff577399-47a9-4bc1-a50d-05a74d2f1c0f/image" xml:lang="en"><p>An object of the present invention is to provide a rubber composition having improved fuel efficiency, wet grip performance and abrasion resistance in good balance, and a tire having a tire member composed of the rubber composition. The rubber composition is a rubber composition comprising: 5 to 20 parts by mass of a terpene resin having a weight-average molecular weight of 500 to 4,000, 5 to 30 parts by mass of a liquid rubber and/or a liquid resin having a weight-average molecular weight of 100 to 4,000, and 95 to 160 parts by mass of silica, based on 100 parts by mass of a diene rubber, wherein a volume change rate of the rubber composition measured in accordance with JIS K 6258 after having been dipped in toluene of 40°C for 24 hours is of 220 to 270%.</p></div>

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A tyre includes a tread portion provided with circumferentially extending main grooves and land portions. The main grooves include an outboard crown main groove (5), and an inboard crown main groove (6). The land portions include a crown land portion (9) defined between the outboard crown main groove (5) and the inboard crown main groove (6). The crown land portion (9) is provided with first crown sipes (14) having first ends connected to the outboard crown main groove (5) and second ends terminating within the crown land portion (9), and second crown sipes (15) having first ends connected to the inboard crown main groove (6) and second ends terminating within the crown land portion (9), wherein the first crown sipes (14) are inclined with respect to a tyre axial direction in a same direction as the second crown sipes (15), and the first crown sipes (14) and the second crown sipes (15) are different in angle with respect to the tyre axial direction.

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A tyre includes a crown main groove formed by unit patterns. Each of the unit patterns includes a first inclined element, a second inclined element, a first bent element, and a second bent element. The first inclined element extends obliquely. The second inclined element extends obliquely in a direction opposite to the first inclined element. The first bent element extends so as to connect between the first inclined element and the second inclined element. The second bent element is connected with the second inclined element. The first bent element is bent so as to be convex toward the first tread edge without having a component extending in parallel with the tyre circumferential direction. The second bent element is bent so as to be convex toward the second tread edge without having the component extending in parallel with the tyre circumferential direction.

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Provided are a rubber composition, for a tire, having significantly improved combined performance of low fuel consumption performance and chip-cut resistance, and a pneumatic tire produced using the rubber composition. The rubber composition for a tire contains an isoprene-based rubber, a butadiene rubber, a styrene-butadiene rubber having a styrene content of 18 to 40% by mass, a carbon black having an iodine adsorption amount not less than 130 mg/g, and silica. In 100% by mass of a rubber component, an amount of the isoprene-based rubber is not less than 40% by mass, an amount of the butadiene rubber is not less than 20% by mass, and an amount of the styrene-butadiene rubber is 1 to 30% by mass. An amount of the silica per 100 parts by mass of the rubber component is 5 to 60 parts by mass.

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A diene copolymer (B) that can improve abrasion resistance and grip performance in a balanced manner, a rubber composition in which the diene copolymer (B) is used, and a pneumatic tire are provided. The diene copolymer (B) has a linear conjugated diene monomer unit and a branched conjugated diene monomer unit, has a weight-average molecular weight of 1000 to 3000000, and has a hydrogenation rate of not less than 15%.

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Provided is a pneumatic tire that can have dry grip performance, wet grip performance, and abrasion resistance that are improved in a well-balanced manner.The pneumatic tire is a pneumatic tire having a tread, wherein, in a temperature distribution curve of a dynamic elastic modulus (E*) of the tread that is obtained by plotting the E* with respect to a measurement temperature thereof, the temperature at a point of intersection of a tangent line to the temperature distribution curve at -20°C and a tangent line to the temperature distribution curve at 30°C is not lower than -10°C and not higher than 10°C, and the E* at the point of intersection of the tangent line to the temperature distribution curve at -20°C and the tangent line to the temperature distribution curve at 30°C is not greater than 30 MPa.

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