Abstract: A pneumatic tire includes a pair of bead cores; a pair of bead fillers that are connected to the pair of bead cores; a carcass ply that is suspended between the pair of bead cores; a side wall rubber that is arranged on a tire-outer-surface-side of the carcass ply and constitutes a tire outer surface; a chafer layer that is turned from a tire-inner-surface-side to the tire-outer-surface-side around the bead cores and the bead fillers and rolled up on an outer surface of the carcass ply; and a pair of support rubbers that are located between the side wall rubber and the carcass ply and arranged so as to hold a rolled-up end of the chafer layer from both sides in a tire width direction. A modulus values of the pair of support rubbers are higher than a modulus value of the side wall rubber.

Abstract: A pneumatic tire includes: a bead core; a bead filler; a carcass ply; a side wall rubber that is arranged on the tire-outer-surface-side of the carcass ply and constitutes a tire outer surface; a chafer layer that is turned from the tire-inner-surface-side to the tire-outer-surface-side around the bead core and the bead filler and rolled up on an outer surface of the carcass ply; a pair of support rubbers that are located between the side wall rubber and the carcass ply and arranged so as to hold a rolled-up end of the chafer layer from both sides in a tire width direction; in which modulus values of the pair of support rubbers are higher than a modulus value of the side wall rubber, and hardness of the hardened support rubber is enhanced while scorch resistance of an unvulcanized rubber composition is maintained.

Abstract: A pneumatic tire has paired bead portions, paired sidewall portions, a tread portion, a plurality of lug grooves extending from a shoulder area of the tread portion to reach a buttress area of the sidewall portion, and a block defined by the plurality of lug grooves. The block includes a shoulder block provided in the shoulder area, and a buttress block provided in the buttress area. The buttress area is provided with an annular rib annularly extending along a tire circumferential direction. The lug grooves are comparted into an outside lug groove positioned in an outer side of the annular rib, and an inside lug groove positioned in an inner side of the annular rib. A widened portion is provided in at least part of the plurality of lug grooves so as to enlarge a width of the annular rib.

Abstract: A pneumatic tire includes a pair of bead cores; a pair of bead fillers; a carcass ply that is suspended between the pair of bead cores; a side wall rubber that is arranged on a tire-outer-surface-side of the carcass ply and constitutes a tire outer surface; a chafer layer that is rolled up from a tire-inner-surface-side to the tire-outer-surface-side of the carcass ply around the bead cores and the bead fillers; and a pad rubber that is arranged between the side wall rubber and the carcass ply to be adjacent to a rolled-up end of the chafer layer in a tire width direction, the pad rubber having a modulus value higher than that of the side wall rubber. The pad rubber includes a constant thickness portion having a substantially constant thickness over a range of 7% or more but not exceeding 26% of a tire reference cross-section height.

Abstract: A pneumatic tire includes a pair of bead cores; a pair of bead fillers; a carcass ply; a side wall rubber; a chafer layer that is rolled up on an outer surface of the carcass ply; and a pair of support rubbers that is located between the side wall rubber and the carcass ply and arranged such that a rolled-up end of the chafer layer is sandwiched from both sides in a tire width direction. The pair of support rubbers includes a tape rubber located inside in the tire width direction and a rear pad rubber located outside in the tire width direction. A modulus value of the tape rubber is higher than a modulus value of the side wall rubber. A modulus value of the rear pad rubber is higher than the modulus value of the tape rubber.

Abstract: A pneumatic tire includes a carcass layer that has a toroidal shape and extends between a pair of bead portions, a sidewall portion, one of the pair of bead portions being provided at an inner end of the sidewall portion in a tire radial direction TR, and a mark formed in an outer surface of the sidewall portion. The mark includes a protruded portion provided in the outer surface of the sidewall portion and recessed inward in a tire width direction, and a mark body defined by the protruded portion. The surface of the mark body coincides with a reference surface corresponding to the outer surface of the sidewall portion.

Abstract: In a pneumatic tire, a rubber surface layer portion comprises a first rubber portion formed from a first rubber, and a second rubber portion formed from a second rubber having a rubber hardness greater than a rubber hardness of the first rubber, the first rubber portion is arranged at a first side in a tire width direction, the second rubber portion is arranged at a second side in the tire width direction, an interface between the first rubber portion and the second rubber portion is arranged between a pair of main grooves that are arranged in outwardmost fashion in the tire width direction, and an average tire outside diameter toward the second side in the tire width direction from a tire equatorial plane is greater than an average tire outside diameter toward the first side in the tire width direction from the tire equatorial plane.

Abstract: A tire includes: a tread portion including a tread surface; a pair of sidewall portions that extend inward in a tire radial direction from both sides of the tread portion in a tire width direction; and a pair of bead portions each of which includes a bead core that is elongated continuously to an inside of the sidewall portion in the tire radial direction and extends continuously in an annular shape in a tire circumferential direction, and a bead filler disposed adjacent to the bead core and outside the bead core in the tire radial direction. A density of the reinforcing cords changes in a range from 20% inclusive to 60% inclusive of a tire sectional height from a tire inner end in the tire radial direction, and such that an outside of an area, in which the density changes, has a low density of the reinforcing cords.

Abstract: A pneumatic tire includes a carcass layer that has a toroidal shape and extends between a pair of bead portions, a sidewall portion, one of the pair of bead portions being provided at an inner end of the sidewall portion in a tire radial direction TR, and a mark formed in an outer surface of the sidewall portion. The mark includes a recessed portion provided in the outer surface of the sidewall portion and recessed inward in a tire width direction, and a mark body defined by the recessed portion. A top surface of the mark body coincides with a reference surface corresponding to the outer surface of the sidewall portion, or is located inside the reference surface in a normal direction of the reference surface.

Abstract: A tire includes a tread portion, a sidewall portion, and a bead portion. The bead portion includes a bead core that extends continuously in an annular shape in a tire circumferential direction, and a bead filler disposed adjacent to the bead core and outside the bead core in a tire radial direction. Reinforcing cords are provided in the bead portion and the sidewall portion so as to be curved such that inclination angles of the reinforcing cords with respect to the tire circumferential direction gradually increase with nearness to an outside in the tire radial direction.

Abstract: A tire has cap rubber that forms a contact patch. The cap rubber has a plurality of lugs. A shoulder lug, which among the plurality of lugs is that which is located outwardmost in a tire width direction, has a narrow groove that extends in the tire circumferential direction and that partitions the shoulder lug into a main lug portion toward the interior in the tire width direction, and a sacrificial lug portion toward the exterior in the tire width direction; and low-modulus rubber, for which stress at a given elongation is lower than that of the cap rubber, is arranged at a corner where the contact patch at the main lug portion and a groove side face toward the interior in the tire width direction which forms the narrow groove intersect.

Abstract: A pneumatic tire includes: a bead core; a bead filler; a carcass ply; a side wall rubber that is arranged on the tire-outer-surface-side of the carcass ply and constitutes a tire outer surface; a chafer layer that is turned from the tire-inner-surface-side to the tire-outer-surface-side around the bead core and the bead filler and rolled up on an outer surface of the carcass ply; a pair of a tape rubber and a rear pad rubber that are located between the side wall rubber and the carcass ply and arranged so as to hold a rolled-up end of the chafer layer from both sides in a tire width direction; and a tread rubber, in which modulus values of the pair of the tape rubber and the rear pad rubber are higher than a modulus value of the side wall rubber, and the tread rubber contains silica.

Abstract: A pneumatic tire includes a plurality extending in a tire circumferential direction, and a plurality of land portions that are partitioned by the plurality of main grooves; the plurality of land portions include at least one shoulder land portion arranged in outwardmost fashion in a tire width direction; the at least one shoulder land portion comprises a plurality of width grooves of groove width of less than 2 mm; and at least one of the plurality of width grooves extends as far as a outside end in the tire width direction of the at least one shoulder land portion and comprises, at a location toward the exterior the tire width direction from a contact patch end, a wide portion at which groove width increases toward a groove bottom.

Abstract: A pneumatic tire has paired bead portions, paired sidewall portions, a tread portion, a plurality of lug grooves extending from a shoulder area of the tread portion to reach a buttress area of the sidewall portion, and a block defined by the plurality of lug grooves. The block includes a shoulder block provided in the shoulder area and a buttress block provided in the buttress area. At least some of the plurality of lug grooves end at a connecting portion connecting the paired buttress blocks, the connecting portion is provided on an inner side in the tire diametrical direction of position that are 50% of length in the tire diametrical direction of the buttress block from upper end position of the buttress block. A step or a protrusion where the buttress block has a largest upraised height is provided in the tire diametrical position of the connecting portion.

Abstract: In a pneumatic tire, a total area of those among a land grooves which are at an outboard shoulder land portion is less than a total area of those among the land grooves which are at an inboard shoulder land portion, an average intersection angle at which those among the outwardly open grooves which are at the outboard shoulder land portion intersect a tire width direction is less than an average intersection angle at which those among the outwardly open grooves which are at the inboard shoulder land portion intersect the tire width direction.

Abstract: A method for filling a liquid into a liquid-filled rubber, the method includes a deaerating step of deaerating a liquid under normal temperature, a cooling step of cooling the deaerated liquid, a pouring step of pouring the cooled liquid into a liquid chamber of a rubber member and a sealing step of sealing the liquid chamber in an atmosphere under reduced pressure to seal the liquid in the liquid chamber.

Abstract: Test conditions including the number of windings of winding a ribbon rubber around a forming drum and a feed pitch for moving the ribbon rubber in an axial direction of the forming drum for each rotation of the forming drum are set, and a test sample is prepared under the test conditions. A thickness distribution in a width direction of the prepared test sample is measured, and the thickness distribution in the measured width direction is compared with the target shape to specify the ribbon rubber located at a portion in which a thickness deviation amount exceeds a predetermined range. Then, the feed pitch of the specified ribbon rubber is changed to prepare the tire component member.

Abstract: An object of the present invention is to form a tire component member having a desired shape by a ribbon winding method without depending on skill and experience of an operator. Test conditions including the number of windings of winding a ribbon rubber around a forming drum and a feed pitch for moving the ribbon rubber in an axial direction of the forming drum for each rotation of the forming drum are set (Step S11), and a test sample is prepared under the test conditions (Step S12). With respect to the prepared test sample, a width, a cross-sectional area, and a thickness distribution in a width direction are measured (Step S13). Based on these results, the test conditions are corrected to obtain a correction condition (Steps S14 to S19).

Abstract: A pneumatic tire is disclosed that can improve high-speed durability and shock resistance without increasing the mass of a belt reinforcing layer. The pneumatic tire includes a carcass, a belt on the outer periphery of a crown part of the carcass and a belt reinforcing layer on the outer periphery of the belt, wherein the belt reinforcing layer is provided with a belt reinforcing ply including an organic fiber cord having a double twisting structure obtained by intertwisting two first twisted yarns including a filament bundle of aliphatic polyamide fibers, having nominal fineness of 4000 dtex or less and having tensile toughness (J) per one cord of 5 J or more, and a major diameter direction of the belt reinforcing ply is parallel to a belt outer periphery, and the product of the toughness (J) per one organic fiber cord and cord count (number/25 mm) is 130 to 180.

Abstract: A non-pneumatic tire includes: an inner annular portion; an outer annular portion; and a plurality of connecting portions connecting the inner and outer annular portions to each other. The first and second connecting portions are arrayed along a tire circumferential direction. The first and second connecting portions have a plate thickness smaller than a plate width and have a plate thickness direction oriented to the tire circumferential direction. When S is a length in the tire width direction and H is a height in a tire radial direction in the first and second connecting portions, an inclination angle K of a centerline of each plate width w of the first and second connecting portions to the tire width direction in intersecting portions of the first and second connecting portions when viewed from the tire circumferential direction satisfies a relationship of 30×(H/S)0.7?K?75×(H/S)0.7.