Sumitomo Rubber Industries Patente

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A tire capable of improving durability and the readability of an electronic component such as an RFID tag in a well-balanced manner is provided. The tire includes: an electronic module including an electronic component and a rubber composition covering the electronic component; and an adjacent rubber member adjacent to the electronic module, a difference in complex elastic modulus E* at 60°C between the rubber composition and the adjacent rubber member is not greater than 2.0 MPa, an amount of carbon black per 100 parts by mass of a rubber component in the rubber composition is 10 to 50 parts by mass, the rubber composition has a volume of 500 to 10000 mm³, and the rubber composition has a relative dielectric constant of 7 or less at 915 MHz.

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A pneumatic tire 2 has a large number of protector ribs 50 on a side surface thereof. Each protector rib 50 projects from a profile of the tire 2. The protector rib 50 has an outer end 52 and an inner end 54. A shape of a cross-section of the outer end 52 is convex inward in an axial direction. The shape of the cross-section of the outer end 52 is preferably a circular arc. A shape of a cross-section of the inner end 54 is convex inward in the axial direction. The shape of the cross-section of the inner end 54 is preferably a circular arc. The tire 2 further has a lateral groove 58. An intersection angle of an axially outer end 60 of this lateral groove relative to the profile is not less than 100° and not greater than 140°.

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A tire (1) is provided with a tread pattern (2) comprising a series of a number N of tread design units (4) arranged repeatedly and circumferentially of the tire in a sequence and having a number m of different circumferential lengths (L). A first pulse train (11) is defined by viewing the tread design units as pulses arranged in the same sequence as the tread design units at intervals which are defined by the circumferential lengths of the corresponding tread design units expressed in term of a ratio to one of the number m of different circumferential lengths. A maximum value Pmax of amplitudes P(k) (k = order from 1 to 2N) of frequencies obtained by Fourier transforming the first pulse train is limited to specific values. The amplitudes P(k) and P(k+1) of every two of the adjacent orders (k) and (k+1) do not satisfy a condition that both of the amplitudes P(k) and P(k+1) have values of 2/3 or more times the maximum value Pmax.

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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.

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.

<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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