Abstract: A pneumatic tire is provided. Center blocks in a center region are in pairs across grooves inclined with respect to a circumferential direction. Each of the center blocks extends from one side to the other of an equator and includes a notch defined by a first and second walls connected in a V-shape in a tread contact surface. The first wall extends within ±20° of the circumferential direction, the second wall extends within ±10° of a lateral direction, an average angle of sipes formed in one of the center blocks and the shoulder blocks is smaller than or equal to 90°±10° with respect to the equator for a first region, smaller than or equal to 130°±10° for a second region, and smaller than or equal to 70°±10° for a third region, and each of the sipes includes at least one bent portion.

Abstract: In order to improve shock burst resistance performance while suppressing a decrease in separation resistance performance, a pneumatic tire includes a tread portion, a belt layer, and a belt cover layer. The belt layer is disposed in the tread portion. The belt cover layer is disposed on an outer side in a tire radial direction of the belt layer. The belt cover layer includes: two layers of full covers disposed between shoulder regions on both sides in a tire width direction and layered in the tire radial direction; and a narrow cover formed with a width in the tire width direction narrower than widths of the full covers. The narrow cover is disposed at a position between the two layers of the full covers and on an inner side in the tire width direction than the shoulder regions.

Abstract: In a pneumatic tire including main grooves extending in a tire circumferential direction in a tread portion, and including a sipe extending in a tire lateral direction on a rib defined by the main grooves, the sipe includes an edge on a leading side and an edge on a trailing side, chamfered portions shorter than a sipe length of the sipe are formed on respective edges, non-chamfered regions on which no other chamfered portion exists exist on portions opposing to respective chamfered portions in the sipe, a maximum depth x (mm) of the sipe and a maximum depth y (mm) of the chamfered portion satisfy x×0.1?y?x×0.3+1.0, and a sipe width of the sipe is constant in a range from an end portion positioned inside in a tire radial direction of the chamfered portion to a groove bottom of the sipe.

Abstract: Provided are a tire vulcanization device and a tire vulcanization method. A container ring is disposed on an outer circumferential side of segments mounted on outer circumferential surfaces of sector molds. A bolster plate is disposed above an upper plate mounted on an upper surface of an upper side mold. A green tire is placed in a sideways state on a lower side mold mounted on an upper surface of a lower plate. In a state where the bolster plate is moved downward by a pressurizing mechanism and maintained in a mold closed position, a container ring held slidably in a vertical direction with respect to the bolster plate by a connecting body is moved downward by pressurizing fluid supplied, and the sector molds are assembled in an annular shape to be closed with the upper side mold pressed against upper surfaces of the sector molds.

Abstract: A hydrogen-filling hose includes reinforcing layers provided coaxially layered between an inner surface layer and an outer surface layer that are coaxially layered. The inner surface layer is formed of a thermoplastic resin and has a gas permeation coefficient of dry hydrogen gas of 1×10?8 cc·cm/cm2·sec.·cmHg or less at 90° C. A flow path formed by the inner surface layer has a diameter of 10 mm or more and 25 mm or less. The reinforcing layers includes four layers or more and eight layers or less, and each of the reinforcing layers has a spiral structure that is formed by spirally winding a metal wire material. Pricking holes extending through the outer surface layer in a thickness direction are dispersedly provided therein.

Abstract: In a method for producing an unvulcanized ring-shaped rubber member a front edge portion of a band-like rubber member conveyed by a conveyor is disposed on an outer circumferential surface of a forming drum, and the forming drum is rotated to wind a length of the band-like rubber member on the outer circumferential surface and a rear edge portion is held by rear edge holding portions arranged side by side in a width direction. Using distribution data on a length of the band-like rubber member in the width direction, an amount of movement of movement portions in a front-rear direction is controlled to adjust the degree of elongation around the held portion of the rear edge portion in the front-rear direction that is held by each of the rear edge holding portions, and the front and rear edge portions are bonded to produce a ring-shaped rubber member.

Abstract: The tread pattern of the pneumatic tire includes an outer main groove, shoulder lug grooves, and vertical sipes. The outer main groove extends in the tire circumferential direction on an outer side of the tire centerline in the tire width direction. The shoulder lug grooves are spaced apart in the tire circumferential direction and provided in the shoulder land portion regions on an outer side of the outer main groove in the tire width direction, extend from the outer side in the tire width direction toward the outer main groove, are closed in a shoulder land portion region. Each of the vertical sipes has a narrower width than each of the shoulder lug grooves, crosses each of the shoulder lug grooves and extends in the tire circumferential direction. Each of the vertical sipes has a depth greater than a groove depth of each of the shoulder lug grooves.

Abstract: A pneumatic tire includes two circumferential main grooves disposed in an inner half of a tread developed width in a tire lateral direction; shoulder lug grooves that divide shoulder land portions into shoulder block portions and that each include a see-through portion in the tire lateral direction; center lug grooves dividing a center land portion into a plurality of center block portions; and center sipes having both ends terminated in the center block portions. The center sipe includes at least two sipe portions having different angles via at least one bent portion. An angle ?1 of at least one sipe portion with respect to a tire equator line satisfies 0°??1?15°, and an angle ?2 of at least the other sipe portion with respect to the tire equator line satisfies 35°??2?60°.

Abstract: In a pneumatic tire, a tread portion is provided with center blocks and shoulder blocks, and sidewall portions are each provided with side blocks. Surfaces of the blocks are provided with groove elements each including a narrow groove and/or a sipe. The first groove elements provided in the side blocks, the second groove elements provided in the shoulder blocks, and the third groove elements provided in the center blocks form a set of lateral groove group extending continuously from the side block on a first side to the side block on a second side in the tire lateral direction along the blocks across a main groove or an auxiliary groove.

Abstract: A pneumatic tire includes a tread surface, a plurality of circumferential main grooves formed on the tread surface and extending in a tire circumference direction, a plurality of lug grooves formed on the tread surface and extending in a tire lateral direction, a plurality of blocks defined by the lug grooves on both sides in the tire circumferential direction and by the circumferential main grooves on at least one end in the tire lateral direction, and narrow grooves formed in the blocks. The narrow grooves include a plurality of bent portions as well as a circumferential narrow groove extending in the tire circumference direction and a lateral narrow groove extending in the tire lateral direction. The lateral narrow groove and the circumferential narrow groove are configured so that at least one thereof is provided in a plurality and includes a plurality of intersection points where the one intersects the other.

Abstract: Provided is a pneumatic tire. Center land portions between main grooves extending in a zigzag shape along a circumferential direction on both sides of an equator of a tread portion are defined into repeating units by first shallow grooves that extend along a lateral direction, have both ends communicating with portions other than bent portions of the main grooves, and are disposed at intervals in the circumferential direction. The repeating units are aggregates of four blocks defined by second shallow grooves extending from the main grooves in the lateral direction and converging toward one point on the equator, a third shallow groove extending from one of the first shallow grooves adjacent to the repeating unit to one of the second shallow grooves, and a fourth shallow groove extending from an other of the first shallow grooves adjacent to the repeating units to an other of the second shallow grooves.

Abstract: A joining structure of a door panel for a lavatory of an aircraft lavatory unit is provided. A plurality of pairs of end surfaces of a structural frame side hinge portion end surface and a door panel side hinge portion end surface facing each other in the vertical direction are alternately provided at intervals in the vertical direction. Bearing members each formed in a cylindrical shape and including a shaft insertion hole are disposed between at least two pairs of end surfaces adjacent to each other in the vertical direction, of the plurality of pairs of end surfaces. Both surfaces of the bearing member are in contact with each of the two pairs of end surfaces.

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 surface of each of the portions of a pneumatic tire includes a ridge pattern region provided with a plurality of ridges continuously extending in one direction and provided at intervals, a non-ridge pattern region including a smooth surface and not provided with the ridges, and a two-dimensional code including a dot pattern formed from two types of gray scale elements distinguishably formed using surface irregularities. The two-dimensional code is engraved entirely overlapping the ridge pattern region or engraved overlapping the ridge pattern region and the non-ridge pattern region.

Abstract: A pneumatic tire is provided. A tread portion includes shallow grooves formed in a road contact surface of each of shoulder blocks, intermediate blocks, and center blocks, defined by a plurality of longitudinal grooves extending in a tire circumferential direction and a plurality of lateral grooves extending in a tire lateral direction, the shallow groove having a smaller groove depth than the longitudinal groove and the lateral groove. The shallow groove extends along the tire lateral direction, and at least one end thereof communicates with the longitudinal groove or the lateral groove. A contour line of the shallow groove is provided with at least one bend point. A sipe is provided in a flat bottom surface of the shallow groove extending along the shallow groove. Among the shallow grooves, center shallow grooves formed in the center block are each provided with a terminating end portion terminating in the center block.

Abstract: A pneumatic tire is vulcanized using a bladder provided with a coating layer formed of a release agent, and includes a sealant layer disposed on an inner surface of a tread portion in a tire circumferential direction. The amount of silicon of the release agents detected in at least a placement region of the sealant layer by fluorescence X-ray analysis is from 0.1 wt. % to 10.0 wt. %.

Abstract: In a pneumatic tire, a sipe includes an edge on a leading side and an edge on a trailing side; the edge and the edge each include a chamfered portion shorter than a sipe length of the sipe; a non-chamfered region in which other chamfered portions are not present is provided at portions facing the chamfered portions of the sipe; and for all chamfered portions, including at least the chamfered portions of the sipe, formed on grooves other than main grooves, with a ground contact width being equally divided into three in the tire lateral direction, a total projected area ACE of chamfered portions provided in a center region centrally located in the tire lateral direction and each of total projected areas ASH of chamfered portions provided in shoulder regions located on either side of the center region satisfy a relationship ACE<ASH.

Abstract: A pneumatic tire that rotates about a center axis includes a tread rubber that comprises a contact patch; a groove provided in the tread rubber, the groove having an inner surface that includes a bottom surface and side surfaces that connect the bottom surface to the contact patch; and a coating film disposed covering at least a portion of the inner surface, the coating film reducing exposure of ultraviolet light to the inner surface.