Sumitomo Rubber Industries Patente

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A determining apparatus for determining a state of a road surface is provided. The determining apparatus includes: a rotational velocity acquiring portion; a slip ratio calculating portion; a driving force acquiring portion; a slope calculating portion; and a determining portion. The slope calculating portion calculates the slope and an intercept, based on many data sets of the slip ratio and the driving force at the time of determination of a state of the road surface and therebefore, when a variation of the driving force is at least a certain value at the time of determination, and calculates the slope based on the data set of the slip ratio and the driving force at the time of determination of a state of the road surface, and the intercept that has been already obtained, when the variation is less than the certain value at the time of determination.

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Provided is a tire that provides improved overall performance in terms of fuel economy, abrasion resistance, and handling stability. Included is a tire which includes a tread including a rubber composition, the rubber composition containing rubber components including an isoprene-based rubber, a polybutadiene rubber, and a styrene-butadiene rubber, and fillers including silica and carbon black, the rubber composition satisfying the following relationships (1) to (3): (1) Isoprene-based rubber content > Styrene-butadiene rubber content; (2) Isoprene-based rubber content > Polybutadiene rubber content; and (3) Silica content ≥ Carbon black content, the tire satisfying the following relationships (4) and (5) with respect to the tan δ at 30°C of the rubber composition and the negative ratio N (%) of the tread: (4) tan δ at 30°C < 0.10; and (5) tan δ at 30°C x N < 4.0.

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To provide pneumatic tires with excellent ride quality during highspeed driving, a pneumatic tire having a tread portion with a circumferential groove and a belt layer, wherein a monofilament cord is used as a reinforcing cord for the belt layer; and the number of arrangements e (lines/5 cm) of the monofilament cords per 5 cm in the tire width direction in the tire radial cross section of the belt layer, the distance G (mm) from the surface of the land portion closest to the equatorial plane among land portions separated by the circumferential groove to the monofilament cord, and the loss tangent (30°Ctan δ) when the rubber composition constituting the surface of the tread portion is measured satisfy (30°Ctan δ × G)/e > 0.015 is provided.

To provide a pneumatic tire excellent in steering stability and fuel efficiency at high-speed driving, .it is provided a pneumatic tire having a tread portion with a circumferential groove and a belt layer, wherein a monofilament cord is used as a reinforcing cord for the belt layer; the number of arrangements e (lines/5 cm) of the monofilament cords arranged per 5 cm in the tire width direction in the tire radial cross section of the belt layer is 50/5 cm or more; and the distance G (mm) from the surface of the land portion closest to the equatorial plane among land portions separated by the circumferential groove to the monofilament cord, and the loss tangent (30°Ctan δ) when the rubber composition constituting the surface of the tread portion is measured under conditions of temperature: 30°C, initial strain: 5%, dynamic strain: ±1%, frequency: 10Hz, and deformation mode: tensile, satisfy 30°Ctan δ × G < 1.5.

The present invention provides heavy duty tires having improved overall performance in terms of ice performance and abrasion resistance. Included is a heavy duty tire including a tread, the tread containing an isoprene-based rubber, a polybutadiene rubber, and a resin, the tread showing a tan δ versus temperature curve with a tan δ peak in the temperature range of -70°C to -20°C, wherein the tan δ at the peak and the half-width of the peak satisfy the relationship (1) below, the tread having a surface roughness after abrasion of 5.5 or more, (the tan δ at the peak in the temperature range of -70°C to -20°C)/(the half-width of the peak) ≥ 0.021 (1).

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It is an object of the present disclosure to provide a tire having improved overall performance of fuel efficiency and steering stability. Provided is a tire comprising a tread part composed of two or more layers and a sidewall part, wherein the tread part composed of two or more layers comprises at least a tread first layer on the outermost side in a tire radial direction and a tread inner layer inside in the tire radial direction, wherein the end of the tread inner layer extends to the sidewall part, the tread inner layer being arranged inside in a tire width direction with respect to a sidewall in the sidewall part, wherein a grounding surface of the tread first layer has two or more circumferential grooves extending continuously in a tire circumferential direction, land parts partitioned by the circumferential grooves, the land parts including a pair of shoulder land parts partitioned by two circumferential grooves located at both ends in the tire width direction and center land parts located between the pair of shoulder land parts, and width direction grooves or width direction grooves and sipes, wherein, where a total area of the land parts is defined as Sr and a total area of the center land parts is defined as Sce, Sr and See satisfy the following inequality (1), and wherein, where a loss tangent at 30°C of the rubber composition of the tread inner layer is defined as 30°C tan δ_BT and a loss tangent at 30°C of the rubber composition of the sidewall in the sidewall part is defined as 30°C tan δ_SW, 30°C tan δ_BT and 30°C tan δ_SW satisfy the following inequality (2). 0.35≤Sce/Sr≤0.80,and30°CtanδBT/30°CtanδSW<1

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Provided is a pneumatic tire 2, for a racing kart, exhibiting traction performance, braking performance, and steering stability in an excellently balanced manner.A tire 2 includes a carcass 10 and reinforcing layers 14. The carcass 10 has a bias structure. Each reinforcing layer 14 includes topping rubber and a plurality of cords. An absolute value of an angle of each cord relative to a circumferential direction is not less than 0° and not greater than 15°. A width Wr of each reinforcing layer 14 is not greater than 25 mm. A height Hi of an inner end Pi of each reinforcing layer 14 in a radial direction is not less than 20 mm. A height Ho of an outer end Po of each reinforcing layer 14 in the radial direction is not greater than 50 mm.

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Provided is a pneumatic tire capable of suppressing adhesion of foreign matter to a sealant layer and deterioration of the sealant layer. A pneumatic tire 1 has a tread portion 2. The pneumatic tire 1 includes: a sealant layer 10 disposed inward of the tread portion 2 in a tire radial direction and containing a viscous sealing agent; and a cover layer 11 disposed on an inner peripheral surface of the sealant layer 10 and covering the sealant layer 10. The cover layer 11 is composed of a mixture obtained by mixing powder 12 containing carbon black.

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