Abstract: A pneumatic tire includes a tread portion, a side wall portion, a buttress portion provided between the tread portion and the side wall portion, a recessed groove provided in the buttress portion and extending along a tire circumferential direction and small hole lines provided in a tire width direction inner side of a contact ground end in the tread portion, in which the small hole lines have a plurality of small holes provided at intervals along the tire circumferential direction, and the small holes communicate with the recessed groove.

Abstract: In a braking performance evaluation method including the steps of acquiring a tire ground contact pressure distribution, acquiring a sliding friction coefficient table, and calculating a friction force of an entire tire using a brush model having a function representing the tire ground contact pressure distribution and the sliding friction coefficient table, the step of acquiring the tire ground contact pressure distribution includes the step of acquiring a first ground contact pressure distribution on a road surface on which no water film is present via actual measurement or calculation and the step of acquiring a second ground contact pressure distribution by applying reduction in a ground contact pressure due to a water film intruded between the tire and the road surface to the first ground contact pressure distribution and using the second ground contact pressure distribution as the tire ground contact pressure distribution used for the calculating.

Abstract: A pneumatic tire includes: paired bead portions respectively including annular bead cores and bead fillers disposed on an outer side in a tire radial direction of the bead cores; sidewall portions respectively extending outward in the tire radial direction from the bead portions; a tread portion connected to outer ends in the tire radial direction of the sidewall portions to form a tread; a carcass layer suspended between the bead portions; and a belt layer provided on an outer side in the tire radial direction of the carcass layer in the tread portion. The carcass layer has a first ply that continuously extends between the bead portions and that has opposite end portions and a second ply that extends from a position in contact with an inner peripheral face of an end portion, wherein the second ply has higher tensile strength than the tensile strength of the first ply.

Abstract: A pneumatic tire includes a shoulder portion that constitutes an outer portion of a ground contact surface in a tire width direction. A groove portion connected to the ground contact surface in a tire circumferential direction is formed in the shoulder portion. The groove portion includes a deep groove portion, and a shallow groove portion formed outside in a tire width direction with respect to the deep groove portion and having a small groove depth. The groove depth of the shallow groove portion cyclically increases and decreases in the tire circumferential direction.

Abstract: A pneumatic tire includes a buttress portion provided between a tread portion and a side wall portion and an uneven portion provided in the buttress portion, in which the uneven portion includes three or more recessed grooves provided along a tire circumferential direction and two or more ridges provided between the recessed grooves, the recessed grooves and the ridges are continuously formed alternately in a tire radial direction to make a corrugated shape on a meridian section, and apexes of the ridges are positioned on a visible outline of the buttress portion.

Abstract: A processing device divides an initial tread pattern into multiple mutually adjacent partial patterns, each having a width smaller than that of the initial tread pattern, by at least one straight line along a circumferential direction of a tire. The processing device calculates variation amounts of characteristic values of the partial patterns with respect to the circumferential direction, based on a contact region, each of the characteristic values indicating a shape of a corresponding partial pattern. The processing device modifies the shapes of the partial patterns so as to reduce the variation amounts of the characteristic values of the partial patterns. The processing device relatively moves the partial patterns along the circumferential direction so as to reduce a total variation amount of characteristic values of at least two mutually adjacent partial patterns. The processing device combines the partial patterns with each other to generate a tread pattern of the tire.

Abstract: The pneumatic tire includes a plurality of ribs formed by a plurality of main grooves extending in a tire circumferential direction and connected to each other in the tire circumferential direction. The shoulder rib positioned on either side in a tire width direction of the ribs includes a first sipe configured to open to a ground contact surface and an outer side surface on a rib end side, and a second sipe positioned on an inner side in a tire radial direction of the first sipe and configured to open to the outer side surface.

Abstract: In a pneumatic tire including plural small holes that are provided at spaced intervals along a tire circumferential direction on an inner side of a ground contact end of a tread in a tire width direction, each of the plural small holes is an elongated hole whose cross section is in an elongated circular shape, and is arranged such that a longitudinal direction thereof is tilted with respect to the tire width direction.

Abstract: A pneumatic tire includes a tread region having surface layer containing a tread surface that contacts the ground, and a sidewall region having an indicator region that indicates a vehicle mounting direction, the surface layer is formed from rubber having a rebound resilience that, is 35% to 40%, the tread region comprises a plurality of main grooves that extend in a tire circumferential direction, total area of that portion of the main grooves which is or are arranged to an inboard side of a center in a tire width direction of the tire as it is to be mounted on a vehicle is greater than total area of that portion of the main grooves which is or are arranged to an outboard side of the center in the tire width direction of the tire as it is to be mounted on the vehicle.

Abstract: A tire vulcanization mold 10 has a plate-like sipe blade 26 used to form a sipe in a tread portion of a pneumatic tire. The sipe blade 26 protrudes to a mold inner side from a mold inner surface 30, and is provided with a through-hole 28 drilled to penetrate through the sipe blade 26. An acute angle portion is formed between a surface 29a of the through-hole 28 on the mold inner side and a surface 27 of the sipe blade 26, and a diameter of the through-hole 28 is larger than 1 mm.

Abstract: A pneumatic tire includes a tread region having surface layer containing a tread surface that contacts the ground, the surface layer is formed from rubber having a rebound resilience that is 35% to 40%, the tread region includes a pair of shoulder main grooves arranged at outermost locations in a tire width direction and extending in a tire circumferential direction, and at least one center main groove arranged between the pair of shoulder main grooves and extending in the tire circumferential direction, and width of the at least one center main groove is greater than width of the shoulder main grooves.

Abstract: A pneumatic tire includes: a tread; a sidewall; a buttress portion provided between the tread and the sidewall; a recessed groove provided along a tire circumferential direction in the buttress portion; and plural small holes provided at spaced intervals along the tire circumferential direction in a groove bottom of the recessed groove.

Abstract: To provide a pneumatic tire capable of suppressing uneven wear occurring in the vicinity of a ground contact end of a tread portion. A pneumatic tire includes a tread portion, a side wall portion, a buttress portion provided between the tread portion and the side wall portion and a plurality of long holes provided in the buttress portion at intervals along a tire circumferential direction, in which the plural long holes are arranged so that a longitudinal direction thereof is inclined with respect to a tire radial direction and projections to the tire radial direction overlap with parts of the long holes adjacent to one another in the tire circumferential direction.

Abstract: A masterbatch manufacturing method comprises an operation in which rubber latex and a carbon black slurry containing a compound according to Formula (I), below, are mixed. At Formula (I), R1 and R2 each indicates a hydrogen atom, an alkyl group having 1 to 20 carbons, an alkenyl group having 1 to 20 carbons, or an alkynyl group having 1 to 20 carbons. R1 and R2 may be the same or different. M+ indicates sodium ion, potassium ion, or lithium ion.

Abstract: A rubber composition for tires is disclosed, which is capable of improving fuel efficiency, wear resistance, wet grip performance, and snow braking performance, and also a pneumatic tire using the same. A rubber composition for tires, including a rubber component containing at least a natural rubber and a butadiene rubber, an inorganic filler, a thermoplastic elastomer containing a functional group that reacts or interacts with a surface functional group of the inorganic filler and having a specific gravity of 1.00 or less, and a phosphate having a coagulation point of ?55° C.

Abstract: Disclosed is a method for producing a rubber composition for tires, including: the step (step (i)) of treating a surface of a carbon black with a compound represented by general formula (I): wherein R1 and R2 each represent a hydrogen atom, or an alkyl group, alkenyl group or alkynyl group having 1 to 20 carbon atoms, and R1 and R2 may be the same as or different from each other; and M+ represents a sodium, potassium or lithium ion to yield a surface-treated carbon black; and the step (step (ii)) of kneading the resultant surface-treated carbon black, and a rubber. This method for producing a rubber composition for tires allows to yield a tire (vulcanized rubber) low in exothermicity, and give a rubber composition for tires that can be restrained from being lowered in scorch property.

Abstract: A rubber composition for tires is provided, which is capable of improving fuel efficiency and wet grip performance, and also a pneumatic tire using the same. A rubber composition for tires, including a rubber component, an inorganic filler, and a thermoplastic elastomer containing a functional group that reacts or interacts with a surface functional group of the inorganic filler and having a specific gravity of 1.00 or less.

Abstract: A method of manufacturing a liquid-sealed antivibration device includes mounting a body component on a liquid tank so that the liquid tank capable of storing a liquid communicates with a liquid-sealed chamber via an opening; supplying the liquid to the liquid tank and the liquid-sealed chamber, storing the liquid in the liquid tank, and charging the liquid in the liquid-sealed chamber; and incorporating an incorporation component into the body component after injecting the liquid from an injection portion toward the incorporation component in a state where the incorporation component is immersed in the liquid stored in the liquid tank.

Abstract: A tire rubber composition comprises butyl-type rubber and silicone oil. The silicone oil comprises silicone having at least two mercapto groups. The tire rubber composition may be used as an innerliner rubber composition.