Sumitomo Rubber Industries Patente

A tire 2 includes a tire body 4 and a sound damper 6 joined to an inner surface of the tire body 4. The tire body 4 includes a tread 8 whose outer surface includes a crown portion 60, a pair of middle portions 62, and a pair of shoulder portions 64. An axially outer end PC of a joint surface between the sound damper 6 and the tire body 4 is located axially inward of a boundary MS between the middle and shoulder portions 62 and 64. A distance in an axial direction from an equator plane to the axially outer end PC is 90% or more of a distance in the axial direction from the equator plane to a boundary between the crown and middle portions 60 and 62. A radius TR1 of an arc representing a contour of the crown portion 60 is 1000 mm or more.

Provided is a tire, wherein a standardized internal pressure of the tire is 350 kPa or more and 600 kPa or less, wherein the tire comprises a copolymer resin comprising cyclopentadiene as a monomer component, and wherein L is 90 or more, and L×P is greater than 1000, where L represents a land ratio, in %, of shoulder parts and P represents a total amount, in parts by mass, of plasticizing agents based on 100 parts by mass of the rubber component in the rubber composition.

Provided is a tire with excellent overall performance in terms of fuel economy during driving in urban areas and lane change performance during high-speed driving. The tire includes a tread, the tread including a tire rubber composition, the tire rubber composition containing a rubber component including styrene-butadiene rubber and an ionic bonding coupling agent, the tread including a first land portion closest to a tire equator among land portions present in an area on a vehicle outboard side from the equator and a second land portion disposed outwardly of the first land portion, the tire satisfying the following conditions (1) to (3): (1) the styrene-butadiene rubber has a styrene content of 20% by mass or less, (2) a width W1 of the first land portion and a width W2 of the second land portion satisfy W1/W2 > 0.3, and (3) total styrene content of the rubber component/(W1 - W2 × 0.3) ≤ 1.5.

A tire deflation determination system includes: a first acquisition processing unit 51A configured to acquire a rotation speed of each tire mounted on a vehicle 1A; a second acquisition processing unit 54A configured to acquire a resonance frequency of the tire, based on the acquired rotation speed; a replacement determination processing unit 58A configured to determine whether or not a difference between the acquired resonance frequency and a reference frequency exceeds a first determination value; and a change processing unit 59 configured to, if it is determined that the difference between the resonance frequency and the reference frequency exceeds the first determination value, change a threshold value used in a deflation determination process of determining whether or not the tire has become deflated.

Provided is a tire, wherein a tread part comprises two or more ribs and two or more lateral grooves, wherein a width direction component of each lateral groove is at least 20% of a rib width, wherein at least some circumferential components of adjacent grooves overlap, wherein the tread part is composed of a rubber composition comprising a rubber component and a plasticizing agent, wherein the rubber component comprises one or more selected from the group consisting of styrene-butadiene rubber and isoprene-based rubber, wherein the plasticizing agent comprises a copolymer resin of styrene and cyclopentadiene, and wherein H/S is less than 5.0, where H represents a groove depth, in mm, at a deepest part of the lateral grooves, and S represents a total styrene amount, in % by mass, in the rubber composition.

The present invention is a tire 1 having a tread portion 2. The tread portion 2 has circumferential grooves 3 including a shoulder circumferential groove 3A disposed closest to a tread end Te, and land portions 4 including a shoulder land portion 4A demarcated between the shoulder circumferential groove 3A and the tread end Te. The shoulder land portion 4A has a shoulder block 6A demarcated by a shoulder lateral groove 5A. A groove depth d1 of the shoulder lateral groove 5A is less than a groove depth d2 of the shoulder circumferential groove 3A. A first shoulder sipe 7A is disposed in a groove bottom 5a of the shoulder lateral groove 5A. The first shoulder sipe 7A includes a first narrow portion 7a having a small width, and a first wide portion 7b having a larger width than the first narrow portion 7a. In the shoulder block 6A, a maximum length L1 in the tire circumferential direction is greater than a maximum width W1 in the tire axial direction.

Provided is a tire with excellent dry grip performance during cornering. The tire includes a tread, the tread including a tire rubber composition, the tire rubber composition containing a rubber component including styrene-butadiene rubber and an ionic bonding coupling agent, the tread including a first land portion closest to a tire equator among land portions present in an area on a vehicle outboard side from the equator and a second land portion disposed outwardly of the first land portion, the tire satisfying the following conditions (1) to (3): (1) the styrene-butadiene rubber has a styrene content of higher than 20% by mass, (2) a land ratio L1 of the first land portion and a land ratio L2 of the second land portion satisfy L2/L1 > 0.3, and (3) (L2 - L1 × 0.3) × total styrene content of the rubber component > 500.

Provided is a tire with excellent wet grip performance during cornering. The tire includes a tread, the tread including a tire rubber composition containing a rubber component, a silica-containing filler, and an ionic bonding coupling agent, the tread having a first land portion closest to a tire equator among land portions present in an area on a vehicle outboard side from the equator and a second land portion disposed outwardly of the first land portion, the tire satisfying the following conditions (1) to (3): (1) an amount of the silica per 100 parts by mass of the rubber component is 100 parts by mass or more, (2) a width W1 of the first land portion and a width W2 of the second land portion satisfy W1/W2 > 0.3, and (3) W 1 − W 2 × 0.3 × amount of the filler > 1300 . <img class="EMIRef" id="1295536a-8703-4169-a0f5-a493807eff43-ia01" />

Provided is a tire with excellent fuel economy during driving in urban areas. The tire includes a tread, the tread including a tire rubber composition, the tire rubber composition containing a rubber component including a carboxylic acid-modified diene-based rubber, a silica-containing filler, and an ionic bonding coupling agent, the tread including a first land portion closest to a tire equator among land portions present in an area on a vehicle outboard side from the equator and a second land portion disposed outwardly of the first land portion, the tire satisfying the following conditions (1) to (3):(1) a polymer content (PC), an acetone extractable content (AE), a carbon black content (BC), and an ash content (Ash) of the rubber composition satisfy (PC + AE)/(BC + Ash) > 1,(2) a width W1 of the first land portion and a width W2 of the second land portion satisfy W1/W2 > 0.3, and, W1−W2×0.3×PC+AE−BC−Ash>100.

Provided is a heavy duty tire 2 that can suppress accumulation of static electricity while maintaining uneven wear resistance. The tire 2 includes a reinforcement layer 14 and a tread 4. The tread 4 includes a cap layer 30 and a conducting portion 36. The tread 4 includes at least four land portions 52. The at least four land portions 52 include two shoulder land portions 54 and a plurality of main land portions 56. At least one of the plurality of main land portions 56 includes the conducting portion 36. The reinforcement layer 14 includes a plurality of belt plies 64 and a full band 70 aligned in a radial direction. Each belt ply 64 includes belt cords 66. A material of each belt cord 66 is steel. The full band 70 includes a helically wound band cord 72. A material of the band cord 72 is steel.

Provided is a tire comprising a tread part and a belt layer, wherein the tread part is composed of a rubber composition comprising: a rubber component comprising a styrene-butadiene rubber and/or an isoprene-based rubber; and a copolymer resin comprising styrene and cyclopentadiene as monomer components, wherein the belt layer has a metal cord consisting of one or more and four or less filaments, and wherein D×S is greater than 2.0, where D represents an outer diameter, in mm, of the filament and S represents a total styrene amount, in % by mass, in the rubber composition based on 100% by mass of the rubber component.

Provided is a tire comprising a tread part, the tread part being composed of a rubber composition comprising a rubber component, a filler, and a plasticizer, wherein the rubber component comprises a styrene-butadiene rubber, wherein the filler comprises carbon black, wherein the plasticizer comprises a resin component, and wherein T is 25.0 or more and R/T is less than 10.0, where R represents a radius of curvature, in mm, of the tread part in a tire equator, and T represent a tan δ peak temperature, in °C, of the rubber composition.

Provided is a heavy duty tire 2 that can achieve weight reduction while maintaining good durability. The tire 2 includes a carcass 12, a pair of sidewalls 6, a pair of chafers 8, and a pair of reinforcement layers 22. The carcass 12 includes a carcass ply 38. The carcass ply 38 includes a ply body 40 and a pair of turned-up portions 42. Each of the reinforcement layers 22 includes a fiber reinforcement layer 48. The fiber reinforcement layer 48 is composed of one fiber reinforcement ply 52. Each sidewall 6 and each chafer 8 are joined at a boundary 54 extending between a radially inner end SU of the sidewall 6 and a radially outer end CG of the chafer 8. The chafer 8 covers the radially inner end SU of the sidewall 6. The sidewall 6 is softer than the chafer 8.

Provided is a tire comprising a tread part, wherein the tread part is composed of a rubber composition comprising a rubber component, a filler, and a plasticizer, wherein the rubber component comprises a styrene-butadiene rubber, wherein the filler comprises carbon black, wherein the plasticizer comprises a resin component, wherein a radius of curvature R of the tread part on a tire equator is 50 mm or more and 220 mm or less, and wherein Dt, 100°C tan δ, and 100°C E* satisfy the following inequality (1): 9.0×100°Ctanδ−1.0×103×100°CE*/Dt>0 where Dt represents a tire outer diameter, in mm, 100°C tan δ represents a tan δ at 100°C of the rubber composition, and 100°C E* represents a complex elastic modulus, in MPa, at 100°C of the rubber composition.

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A tire suitable for running on paved roads and rough terrain is provided. A tread portion 2 includes a plurality of lateral grooves 21 crossing a tire equator C and bent in a V-shape, and a plurality of land portions 22 demarcated by the plurality of lateral grooves 21. Each of the plurality of land portions 22 is divided by a plurality of circumferential grooves 23 so as to include a crown block 24 located on the tire equator C and a pair of shoulder blocks 25 located outward of the crown block 24 in a tire axial direction. The crown blocks 24 include a first crown block 31. A first sipe 41 is formed on the first crown block 31 so as to be located on the tire equator C and fully traverse the first crown block 31 in a tire circumferential direction.

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Provided is a pneumatic tire capable of achieving weight reduction while maintaining durability. A pneumatic tire 1 includes a carcass 6, a belt layer 7, and reinforcing rubber layers 10. Turned-up portions 6b of a carcass ply 6A each include a first portion 11 located between a body portion 6a and the belt layer 7, a second portion 12 adjacent to each reinforcing rubber layer 10 in a tire axial direction, on an outer side in a tire radial direction with respect to a rim flange Rf of a standardized rim R, and a third portion 13 located between the first portion 11 and the second portion 12. A length Lc of the third portion 13 is 0.8 to 1.4 times a sum (La+Lb) of a length La of the first portion 11 and a length Lb of the second portion 12.

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A pneumatic tire includes a tread portion, a pair of sidewall portions, a pair of bead portions, a carcass extending between the pair of bead portions, and an inner rubber extending between the pair of bead portions on an inner side of the carcass. The inner rubber includes a first portion extending in the tread portion with a first thickness and a second portion extending in each of or one of the pair of sidewall portions with a second thickness. The first thickness is greater than the second thickness. In a tire meridian cross-section, a cross-sectional area of the inner rubber is in a range from 1.5% to 10% of an inner-cavity cross-sectional area of the pneumatic tire.

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