Abstract: With a pneumatic tire not mounted on a rim, in a meridian cross-section a first line is parallel with an innermost bottom side of a bead core in a radial direction and passes through an outermost projection of the bead core in a lateral direction, a second line is orthogonal with the first line at the outermost projection, a third line is orthogonal with the first line and passes through an intersection of a rim cushion rubber, a distance between the second and third lines is 2.0 to 4.0 mm, a shortest distance between an innermost projection of the bead core in the lateral direction and a cord of a carcass layer is 0.6 to 1.4 mm, and a shortest distance between an innermost end of the bottom side of the bead core in the lateral direction and the cord of the carcass layer is 1.2 to 2.2 mm.

Abstract: A manufacturing device for an unvulcanized band-shaped rubber member is provided. A position sensor detects, across a width direction of the band-shaped rubber member, leading and trailing ends of the band-shaped rubber member placed in a flat state on a conveyor, holding portions arranged side by side in the width direction hold at least one of the leading or trailing ends, with movement portions allowing the holding portions to move individually in a front-rear direction, the leading and the trailing ends are held by the leading and trailing end holding mechanisms, respectively, and a control unit controls a displacement of the movement portions in the front-rear direction based on data from the position sensor and a target length to adjust elongation in the front-rear direction at or near a held portion held by each of the holding portions to achieve the target length of the band-shaped rubber member.

Abstract: Provided is a pneumatic tire. Side blocks are provided at extension positions of shoulder blocks on an inner side in a tire lateral direction, and each of the side block is formed into an L-shape in which a radial portion extending in a tire radial direction and a circumferential portion extending in a tire circumferential direction are coupled in a hook portion. Of the side blocks, first blocks having the circumferential portions oriented to the shoulder block side and second blocks having the radial portions oriented to the shoulder block side form pairs by facing each other so that the circumferential portions of the first blocks and the second blocks overlap with each other. The side block pairs formed of the first blocks and the second blocks are arrayed in the tire circumferential direction.

Abstract: The present technology provide a rubber composition including: 100 parts by mass of a diene rubber, from 30 to 100 parts by mass of carbon black and/or a white filler, from 1 to 20 parts by mass of silicone-based microparticles that have an average particle size from 5 to 500 ?m and that are three-dimensionally crosslinked, from 0.1 to 10 parts by mass of a nonionic surfactant, and from 1 to 20 parts by mass of thermally expanding microcapsules.

Abstract: Provided is a pneumatic tire. At least one land portion is defined and formed by a plurality of circumferential main grooves provided in a tread surface. A main sipe including a body portion and a chamfered portion is formed in at least one side of the body portion. A branch sipe branching from the chamfered portion is provided. The depth of the body portion is equal to or greater than the depth of the branch sipe.

Abstract: In a state in which the pneumatic tire is mounted on a regular rim and inflated to 5% of a specified internal pressure, a tread width is TW, a total tire width is SW in a tire meridian cross-sectional view, a relationship of 0.80?TW/SW?0.95 is satisfied, a ground contact width at a load of 100% of a maximum load capacity is CW100, a ground contact width at a load of 70% of the maximum load capacity is CW70, and a relationship of 1.04?CW100/CW70?1.15 is satisfied.

Abstract: A stud pin includes a tip including an end surface configured to come into contact with a road surface, a body portion configured to support the tip, and a lower flange. The flange profile shape of the lower flange is an anisotropic shape. The flange profile shape includes four or more first flange protrusion portions that project in the longitudinal direction and two second flange protrusion portions that project in the lateral direction. A tip profile shape of the tip is a shape including tip linear portions extending in a linear manner. At least one of the tip linear portions extends along a portion of the flange profile shape between two adjacent protrusion portions of the first flange protrusion portion and the second flange protrusion portion along the outer circumference of the flange profile shape.

Abstract: Provided are a quality inspection method and a quality inspection system for unvulcanized rubber material. A final dielectric constant measurement device detects the dielectric constant of a final rubber material in which a compounding agent of predetermined type is mixed with unvulcanized rubber, and a calculator calculates a compounding ratio of the compounding agent to the final rubber material based on the detected dielectric constant, determines whether or not the calculated compounding ratio is in a preset compounding reference range, displays a determination result on a monitor, and adjusts a ratio of the compounding agent fed into an extruder to the unvulcanized rubber such that the calculated compounding ratio is within the compounding reference range.

Abstract: Provided is a pneumatic tire including a pair of bead portions; at least one carcass layer extending between the pair of bead portions; a belt layer disposed outward of the carcass layer in a tire radial direction; a tread rubber disposed outward of the belt layer in the tire radial direction; a pair of sidewall rubbers disposed outward of the carcass layer in a tire lateral direction; and an electrically conductive portion extending between the pair of bead portions and having at least one separation portion, the electrically conductive portion having a linear structure, the linear structure including an electrically conductive linear member formed in a linear shape by molding an electrically conductive material with an electrical resistivity of less than 1×10{circumflex over (?)}8 ?/cm.

Abstract: A pneumatic tire comprises a tread rubber with a groove depth at a shoulder portion that comes into contact with a road surface of 10 mm or greater. A rubber composition of the tread rubber contains: 60 to 70 parts by mass of carbon black having a nitrogen adsorption specific surface area of 70 to 130 m2/g, 0.5 parts or greater by mass of sulfur, and a vulcanization accelerator per 100 parts by mass of diene rubber including 50 to 70 mass % of styrene-butadiene rubber, 20 to 30 mass % of butadiene rubber, and 10 to 30 mass % of natural rubber. The diene rubber has an average glass transition temperature of ?65° C. or lower. A ratio of a compounded amount of the vulcanization accelerator to a compounded amount of the sulfur is 1.0 to 1.3. The tread rubber has a rubber hardness of 65 to 70 at 20° C.

Abstract: A tire has a tire center in the tire width direction. An intersection point of a carcass outer surface with a parallel line extending parallel with a rotation axis and passing through a tire maximum width position is denoted as P1. An intersection point of the parallel line LP with a side surface is denoted as P2. An intersection point of the parallel line with a protrusion portion outer surface of a protrusion portion is denoted as P3. A distance between the tire center and the intersection point P1 is denoted as W1. A distance between the tire center and the intersection point P3 is denoted as W3. A distance between the intersection point P1 and the intersection point P2 is denoted as G1. A distance between the intersection point P2 and the intersection point P3 is denoted as G2. 0.80?W1/W3?0.95 and 0.1?G1/G2?1.

Abstract: A tire includes a narrow shallow grooved region on a land portion defined by a circumferential main groove. The narrow shallow grooved region includes a plurality of narrow shallow grooves that are not open to the circumferential main groove. A ratio of a total area of the narrow shallow grooved region to a ground contact area of the land portion is not less than 0.05 and not greater than 0.60.

Abstract: Provided is a piping system for an air conditioner installed in a vehicle that can achieve appropriate weight reduction while ensuring appropriate pressure resistance as the piping system as a whole. A circulation path that connects component devices of an air conditioner (8) in an annular shape to circulate a refrigerant (C) is formed by each pipe body extending between the component devices. At least one of the pipe bodies includes: a resin hose (2) embedded with a non-metal reinforcing material (3f) or a resin pipe (5) embedded with a non-metal reinforcing material (6f), and the resin pipe bodies (2), (5) are employed in 50% or more of a total length of each of the pipe bodies constituting the circulation path.

Abstract: Each sipe wall surface of a sipe in a tread portion of a pneumatic tire includes, along a sipe depth direction, multiple ridge portions and at least one valley portion bending like waves. Where viewed along the sipe depth direction, a recess depth of the valley portion with respect to the ridge portion on one wall surface varies depending on a position in the extension direction, the valley portion extends from a position at which the recess depth is maximized toward a position at which the recess depth is minimized, and the recess depth decreases as the valley portion extends from the side of the maximum-depth valley portion toward the maximum ridge portion. The sipe is provided in at least one of a first half-tread region on a first side or a second half-tread region on a second side in a tire width direction.

Abstract: A run-flat tire includes side reinforcing rubber between a carcass layer and an innerliner layer in sidewall portions, first bead filler rubber arranged inside folded back portions of the carcass layer, and second bead filler rubber arranged outward of the folded back portions of the carcass layer in a lateral direction and along the carcass layer. In a meridian cross-section, a radial-direction height of the first bead filler rubber is 15% or greater and 40% or less of a cross-sectional height, a radial-direction height of the second bead filler rubber is 35% or greater and 55% or less of the cross-sectional height, a linear distance from a radial-direction outer end to a radial-direction inner end of the second bead filler rubber is 20% or greater and 45% or less of the cross-sectional height, and the second bead filler rubber has a larger cross-sectional area than the first bead filler rubber.

Abstract: A method for manufacturing a tire includes forming a belt layer by bonding strip materials adjacent in the circumferential direction on the molding surface located on the outer circumferential side of the rigid core. Along the profile in the width direction of an outer circumferential surface of the rigid core, the rigid core is moved so that the molding surface is brought close to the strip material to be bonded, and the strip material is bonded to the molding surface extending in the longitudinal direction while rotating the rigid core in a direction in which the circumferential angle of the rigid core with respect to the longitudinal direction of the strip material changes, so that variation in the bonding margin, due to the position of the rigid core in the width direction, between strip materials that have been adjacently bonded to the molding surface in the circumferential direction is reduced.

Abstract: A pneumatic tire comprises a carcass layer, a belt layer disposed on the outer side in the tire radial direction of the carcass layer, and tread rubber disposed on the outer side in the tire radial direction of the belt layer. The belt layer is formed by laminating a pair of cross belts having belt angles with an absolute value from 10° to 45° both inclusive and mutually opposite signs, and a circumferential reinforcing layer having a belt angle within a range of ±5° relative to the tire circumferential direction. The distance (Gcc) from the tread profile to the tire inner circumferential surface along the tire equatorial plane and the distance (Gsh) from the tread edge to the tire inner circumferential surface have a relationship satisfying 1.10?Gsh/Gcc. The groove depth (Dsh) and under-groove gauge (UDsh) of the outermost circumferential main groove have a relationship satisfying 0.20?UDsh/Dsh.