Abstract: A tread mold includes a securable region at an outer circumferential portion thereof which is capable of being secured to a jig at a machining apparatus, and a positioning surface at the outer circumferential portion thereof which is capable of making surface contact with a reference surface at the jig so as to permit positioning to be carried out relative to the jig, the positioning surface is arranged so as to face in the tire circumferential direction so as to permit the tread mold to be positioned relative to the jig in the tire circumferential direction.

Abstract: A pneumatic tire is provided with tread rubber that forms a contact patch; and a belt layer which is disposed toward the interior in a tire radial direction from the tread rubber. A shoulder lug portion is provided with a narrow groove that partitions the shoulder lug portion into a main body portion and into a sacrificial portion. A plurality of concavities are open toward both the contact patch at the main body portion and the groove side face, wherein innermost ends in the tire width direction of the respective concavities are disposed so as to be at the same location in the tire width direction as an outermost end in the tire width direction of the belt layer or are arranged toward the exterior in the tire width direction from the outermost end in the tire width direction of the belt layer.

Abstract: Provided are a tread portion which includes a plurality of main grooves extending in a tire circumferential direction, and a buttress portion provided outside the tread portion in a tire width direction. The buttress portion includes at least a first side groove formed on an outer side in a tire radial direction, and a second side groove formed on an inner side in the tire radial direction with a groove bottom line interposed between the first side groove and the second side groove. The groove bottom line connects groove bottoms of the main grooves.

Abstract: A structure for securing an electronic part to a tire, has a sheet for securing the electronic part which is arranged between the sheet and a tire inner surface; and cushioning material which is arranged about a periphery of the electronic part and which adheres to the sheet and the tire inner surface. The cushioning material is not arranged on the tire inner surface where the electronic part is present but surrounds the electronic part completely or surrounds the electronic part except for at least one gap smaller than the electronic part.

Abstract: To obtain a uniform ground contact pressure distribution in a pneumatic tire including a zigzag-shaped sipe. In a pneumatic tire according to an embodiment, a land portion formed in a tread portion is provided with a zigzag-shaped sipe extending in a tire circumferential direction. The zigzag-shaped sipe is formed in a zigzag shape by a plurality of lateral sipe portions arranged at intervals in the tire circumferential direction and a plurality of longitudinal sipe portions alternately connecting the end portions thereof. Each longitudinal sipe portion includes an extension portion in which one end portion (for example, an end portion on a rear side in a rotation direction) of both end portions in the tire circumferential direction extends to the one side beyond a connection portion with the lateral sipe portion.

Abstract: To provide a pneumatic tire capable of improving rut running performance. In a pneumatic tire according to an embodiment, a shoulder block provided in a shoulder region of a tread portion is provided with a plurality of sipes which are formed at intervals in a tire circumferential direction to extend in a tire width direction. In the plurality of sipes, a dimple is provided on an outside in the tire width direction in relation to each tire ground contact end in a communication state. The dimple includes a portion formed with a wide width from a connection portion with the sipe toward the outside in the tire width direction and maximum width portions of the plurality of dimples are disposed to be offset in the tire width direction.

Abstract: To provide a pneumatic tire capable of improving rut performance. A pneumatic tire according to an embodiment is a tire having a specified rotation direction. A shoulder region of a tread portion is provided with a shoulder block and a raised portion is provided in an outer extension portion of the shoulder block in a tire width direction in relation to a tire ground contact end. The raised portion includes a corner portion which protrudes from an edge portion of the shoulder block on a front side in the rotation direction toward the front side in the rotation direction.

Abstract: In a pneumatic tire, an annular sipe (80) is provided in a land portion (36), and the annular sipe (80) is constituted by a plurality of independent small sipes (81) extending in a circumferential direction of the annular sipe (80).

Abstract: A pneumatic tire includes a center land portion between two center main grooves, a mediate land portion between a center main groove and a shoulder main groove, and a shoulder land portion between the shoulder main groove and a grounding end (E). Each of the center main grooves extends in a zigzag manner by alternately arranging long first groove portions and short second groove portions that are inclined with respect to a circumferential direction of the tire, respectively. A bulging portion in a tire width direction is formed in the center land portion. Each of the first groove portions of the center main groove is inclined such that a portion to be grounded later heads toward the grounding end (E) side. Each first lateral groove traverses the mediate land portion and the shoulder land portion and forms a notch in the bulging portion in the center land portion.

Abstract: A pneumatic tire includes blocks (36 and 41) formed by main grooves (10 and 15) extending in a circumferential direction of the tire and lateral grooves (20 and 25) extending in a tire width direction, and notches (50, 60, and 70) in stepped side end portions of the blocks (36 and 41). The lateral grooves (20 and 25) extend obliquely such that a tire grounding end (E) side is grounded later. Portions adjacent to the notches (50, 60, and 70) on the tire grounding end (E) side of the notches (50, 60, and 70) are protrusions (51, 61, and 71) protruding while forming an acute angle toward a tire equator (C) side.

Abstract: To obtain a uniform ground contact pressure distribution in a pneumatic tire in which an edge portion of a land portion is provided with a notch portion. In a pneumatic tire according to an embodiment, an edge portion of a land portion formed in a tread portion is provided with a notch portion having a triangular shape in the plan view. A wavy sipe is provided to extend from an apex corner portion of the notch portion into the land portion and a straight sipe is provided adjacent to the wavy sipe with a gap interposed therebetween to extend into the land portion and to open to the edge portion of the land portion.

Abstract: To prevent an interrupted portion in a sipe in a case in which a pneumatic tire with a sipe continuous in a tire circumferential direction has a pitch variation. A pneumatic tire according to an embodiment includes a tread portion 10 in which a plurality of pitch patterns having different pitch lengths are arranged in a tire circumferential direction. A rib extending in the tire circumferential direction of the tread portion is provided with a sipe continuous in the tire circumferential direction. The sipe is formed by repeating a sipe component in the tire circumferential direction and each pitch pattern includes the plurality of sipe components. A position in the sipe component at each boundary between the pitch patterns is set to the same position and a length of the sipe component in the tire circumferential direction is set according to the pitch lengths of the pitch pattern.

Abstract: A pneumatic tire includes a center land portion (30), a mediate land portion (35), a shoulder land portion (40), and shallow grooves (33, 38, and 43) on a surface of each of the land portions (30, 35, and 40), in which the shallow grooves (33 and 43) in the center land portion (30) and the shoulder land portion (40) have many components in a circumferential direction of the tire, and the shallow grooves (38) in the mediate land portion (35) have more components in a tire width direction than the shallow grooves (33 and 43) in the center land portion (30) and the shoulder land portion (40).

Abstract: In a pneumatic tire in which protrusions (90 and 95) are provided in main grooves (10 and 15) extending in a circumferential direction of the tire, upper surfaces (91 and 96) of the protrusions (90 and 95) are inclined so as to be higher on a tire grounding end side and lower on a tire equator side, surfaces (92 and 97) on stepped sides of the protrusions (90 and 95) extend in the tire width direction, and surfaces (93 and 98) on kick-out sides of the protrusions (90 and 95) are inclined such that a portion closer to the tire equator side approaches to the surfaces (92 and 97) on the stepped sides.

Abstract: A pneumatic tire includes land portions defined by grooves, and sipes that are formed in the land portions and intersect the grooves. The sipes form acute angle portions and obtuse angle portions with the grooves. Notches are formed in the obtuse angle portions.

Abstract: A pneumatic tire includes a block (41) formed by being partitioned by a main groove (15) and lateral grooves (20 and 25), and a block traversing sipe (45) which is a sipe longitudinally traversing the block (41), in which the block traversing sipe (45) has a zigzag shape that is constituted by a plurality of longitudinal sipe portions (42) extending in a circumferential direction of the tire, and a lateral sipe portion (43) extending in a tire width direction and connecting end portions of two longitudinal sipe portions (42), and a longitudinal sipe portion (42) closer to a kick-out side of the block (41) has a narrower width.

Abstract: A vibration damper, which enables a spring constant in the axial direction to be increased while reducing a spring constant in the torsional direction and a spring constant in the direction perpendicular to the axial direction, is provided. With dividing surfaces of first rubber parts and dividing surfaces of second rubber parts separated from each other in the direction of the axis, and spaces formed between the dividing surfaces, first outer cylinder parts and second outer cylinder parts are held and fixed by cylindrical members. Using the spaces between the dividing surfaces of the first rubber parts and the dividing surfaces of the second rubber parts, a compression component of the rubber base in the direction of the axis can be maintained while suppressing a shear component of the rubber base in the torsional direction and the compression component of the rubber base in the direction perpendicular to the axis.

Abstract: A rubber composition wherein a compounding amount of a solution-polymerized polystyrene butadiene rubber is 50 parts by mass or more and a compounding amount of a zinc-containing compound is less than 0.5 parts by mass, based on 100 parts by mass of a total amount of rubber components. It is preferable that the solution-polymerized polystyrene butadiene rubber is a solution-polymerized polystyrene butadiene rubber whose molecular terminal is modified.

Abstract: A shoulder land portion includes a main body land portion formed between a thin groove extending in a tire circumferential direction on a tire width direction inner side of a ground contact end and a shoulder main groove, and the main body land portion includes a contact region adjacent to the shoulder main groove provided along the tire circumferential direction and a non-contact region provided along the tire circumferential direction between the thin groove and the contact region. The contact region contacts a road surface in a normal load state, and the non-contact region is recessed to a tire radial direction inner side from a tread surface. The non-contact region does not contact the road surface in the normal road state, and when a length of the non-contact region is W1 and a length of the main body land portion both along the tire width direction is Rw, 0.2Rw?W1?0.5Rw.

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 cuter ends in the tire radial direction of the sidewali portions to form a tread; and a carcass layer suspended between the bead portions. The carcass layer has a first ply that continuously extends between the bead portions and that has opposite end portions respectively and a second ply that continuously extends on the outer side in the tire radial direction of the first ply, wherein the first ply has higher tensile strength than that of the second ply, and the end portion is positioned on the outer side in the tire radial direction of the end.