Abstract: A pneumatic tire having enhanced on-ice braking performance achieved by further increasing the amount of water that can be sucked up into sipes. In the pneumatic tire, blocks (26) partitioned by circumferential grooves and lateral grooves are formed in the tread. A sipe (28) is formed in a block (26), and a fine structure (32) having a height in the range of from 1/50 of the sipe width t to less than 1/10 of the sipe width t is formed on a sipe wall surface. This reduces fluid friction coefficient of water relative to the sipe wall surface to a lower level than conventional products. As a result, when water staying on ice comes into contact with the sipe wall surface, the water is more easily sucked up into the sipe. The construction increases the amount of water that can be sucked up into the sipe (28) or the removal amount of water that stays on ice etc., and this enhances braking performance (friction characteristics) on ice.

Abstract: The present invention provides a pneumatic radial tire which is, by effectively suppressing collapse-deformation of a relatively large magnitude in sectioned portions of each block, which sections are demarcated by sipes, and also effectively preventing the sipe from making narrowing-deformation, excellent in not only driving performance and braking performance on an icy or snowy road but also driving stability on a general road. The tire characteristically includes: a tread having a contact surface 1; plural circumferential grooves 2; plural lateral grooves 3; blocks 4 demarcated by the circumferential grooves and the lateral grooves in the contact surface of the tread; and plural sipes 5 provided in the blocks 4, wherein the bottom portion of each sipe 5 is provided with at least one upward-protruding projection 7 for integrally connecting respective facing groove walls of the sipe 5.

Abstract: The tread surface of a tire according to the present invention is molded with a tire mold having a tread molding surface, and at least a portion of the tread molding surface is formed by projecting spherical projection material having a predetermined sphericity and causing the spherical projection material to collide.

Abstract: Provided is a studless tire capable of achieving both the traction performance and the steering stability at the time of traveling on the ice and snow at a high level. A tread surface 10 is disposed on the studless tire such that, among lateral grooves 3A, 3B, 3C, 3D, 5 extending in an axial direction within each block array 2A, 2B, 2C, 2D, an axial length of a lateral groove 3A, 3B, 3C, 3D opening to at least one straight circumferential groove 1, 1A, 1B adjacent to the block array provided with the lateral groove is referred to as a groove edge component, a proportion of the total length of the groove edge components on the inner tread surface IN to the total length of the groove edge components on the outer tread surface OUT is 1.03-1.3, and, a proportion of a negative ratio of the outer side surface OUT to a negative ratio of the inner side surface IN is 0.85-1.0.

Abstract: The tread surface of a tire according to the present invention is molded with a tire mold having a tread molding surface, and at least a portion of the tread molding surface is formed by projecting spherical projection material having a predetermined sphericity and causing the spherical projection material to collide.

Abstract: The tread surface of a tire according to the present invention is molded with a tire mold having a tread molding surface, and at least a portion of the tread molding surface is formed by projecting spherical projection material having a predetermined sphericity and causing the spherical projection material to collide.

Abstract: The present invention provides a tire with improved on-ice performance and on-snow performance and a tire forming mold used for manufacturing (forming) the tire. The present invention provides a tire that has a large number of protrusions formed on at least a part of a tread surface and partitioned by recesses extending in a mesh pattern, in which each recess has a recess width of 50 ?m or less. A tire forming mold that has a tread-surface molding surface for molding the tread surface of the tire, with a large number of recesses partitioned by protrusions extending in a mesh pattern formed on at least a part of the tread-surface molding surface, in which each protrusion has a protrusion width of 50 ?m or less.

Abstract: The present invention provides a tire that has a maximum profile peak height Rp in a predetermined range on at least a part of the tread surface. In addition, a tire forming mold of the present invention has a maximum profile peak height Rp in a predetermined range on at least a part of the tread-surface molding surface.

Abstract: The tread surface of a tire according to the present invention is molded with a tire mold having a tread molding surface, and at least a portion of the tread molding surface is formed by projecting spherical projection material having a predetermined sphericity and causing the spherical projection material to collide.

Abstract: A pneumatic tire exhibiting high traction performance. A center circumferential groove (14) is provided on the equator (CL) of the tread (12), and between shoulder circumferential grooves (18) on both sides of the center circumferential groove (14) are arranged first lateral grooves (20) formed at a smaller angle relative to the axial direction of the tire than the first lateral groove (20). One end of each first lateral groove (20) and one end of each second lateral groove (22) are made to merge at a shoulder circumferential groove (18), and shoulder lateral grooves (23) are arranged on the outer side of each shoulder circumferential groove (18). Each shoulder lateral groove (23) extends from the merging portion toward a tread end (12E) and is formed at a smaller angle relative to the axial direction of the tire than that of the first lateral groove (20). Because the angle of the shoulder lateral grooves (23) relative to the axial direction of the tire is less, traction performance of the tire increases.

Abstract: A pneumatic tire according to the present invention includes blocks on its tread which are segmented by plural circumferential grooves 3 extending along a tire circumferential direction and plural lateral grooves 5 extending along a tread width direction. Circumferential sipes extending along the tire circumferential direction are provided in the blocks. Inside circumferential sipes extend straight along a tire radial direction and outside circumferential sipes extend along the tire radial direction in zigzag patterns. According to the present invention, a handling performance, especially, a cornering performance can be improved regardless of road surface conditions.

Abstract: A plurality of shallow grooves which are shallower than a sipe are formed on land sections formed on treads of a pneumatic tire. The shallow grooves are configured so that a total sectional area of the shallow grooves per unit area in a cross section in a tire width direction in at least one of tread end areas arranged at end sides of the tread surface in the tire width direction or land end areas arranged at portions adjacent to a drain main groove on the land sections becomes larger than a total sectional area of the shallow grooves per unit on the other areas.

Abstract: Provided is a studless tire capable of achieving both the traction performance and the steering stability at the time of traveling on the ice and snow at a high level. A tread surface 10 is disposed on the studless tire such that, among lateral grooves 3A, 3B, 3C, 3D, 5 extending in an axial direction within each block array 2A, 2B, 2C, 2D, an axial length of a lateral groove 3A, 3B, 3C, 3D opening to at least one straight circumferential groove 1, 1A, 1B adjacent to the block array provided with the lateral groove is referred to as a groove edge component, a proportion of the total length of the groove edge components on the inner tread surface IN to the total length of the groove edge components on the outer tread surface OUT is 1.03-1.3, and, a proportion of a negative ratio of the outer side surface OUT to a negative ratio of the inner side surface IN is 0.85-1.0.

Abstract: The present is intended to provide a studless tire capable of enhancing ice performance without complicating the structure and the material. The studless tire 10 is configured such that the width 2W of a radially outwardly disposed belt ply 12 of belt plies constituting a belt 8 is 60%-70% of a maximum tire width MW.

Abstract: The present invention is intended to provide a studless tire capable of enhancing straight-running stability with a low tread rigidity. In a section of a studless tire 10 passing a central axis line under a condition where the tire is mounted on a predetermined rim 11 and a predetermined inner pressure is charged therein, assuming that a distance A is measured from a position where a bladder ring is divided to a position where a maximum tire width is obtained along the tire radial direction and a distance B is measured from the position where the bladder ring is divided to a position where a tread ring is divide along the tire radial direction, a side-shape coefficient of the tire defined as a ratio A/B in a state where the tire is installed on a vehicle is between 0.52 and 0.55 in a widthwise half portion disposed at a widthwise outer side of the vehicle and between 0.45 and 0.50 in a widthwise half portion disposed at a widthwise inner side of the vehicle, or between 0.5 and 0.

Abstract: A pneumatic tire according to the present invention includes blocks on its tread which are segmented by plural circumferential grooves 3 extending along a tire circumferential direction and plural lateral grooves 5 extending along a tread width direction. Circumferential sipes extending along the tire circumferential direction are provided in the blocks. Inside circumferential sipes extend straight along a tire radial direction and outside circumferential sipes extend along the tire radial direction in zigzag patterns. According to the present invention, a handling performance, especially, a cornering performance can be improved regardless of road surface conditions.

Abstract: The present invention provides a pneumatic radial tire which is, by effectively suppressing collapse-deformation of a relatively large magnitude in sectioned portions of each block, which sections are demarcated by sipes, and also effectively preventing the sipe from making narrowing-deformation, excellent in not only driving performance and braking performance on an icy or snowy road but also driving stability on a general road. The tire characteristically includes: a tread having a contact surface 1; plural circumferential grooves 2; plural lateral grooves 3; blocks 4 demarcated by the circumferential grooves and the lateral grooves in the contact surface of the tread; and plural sipes 5 provided in the blocks 4, wherein the bottom portion of each sipe 5 is provided with at least one upward-protruding projection 7 for integrally connecting respective facing groove walls of the sipe 5.

Abstract: A pneumatic tire having enhanced on-ice braking performance achieved by further increasing the amount of water that can be sucked up into sipes. In the pneumatic tire, blocks (26) partitioned by circumferential grooves and lateral grooves are formed in the tread. A sipe (28) is formed in a block (26), and a fine structure (32) having a height in the range of from 1/50 of the sipe width t to less than 1/10 of the sipe width t is formed on a sipe wall surface. This reduces fluid friction coefficient of water relative to the sipe wall surface to a lower level than conventional products. As a result, when water staying on ice comes into contact with the sipe wall surface, the water is more easily sucked up into the sipe. The construction increases the amount of water that can be sucked up into the sipe (28) or the removal amount of water that stays on ice etc., and this enhances braking performance (friction characteristics) on ice.

Abstract: Disclosed is a pneumatic tire including: plural blocks (7) formed by plural grooves (circumferential grooves 3 and lateral grooves 5) extending in a tire circumferential direction and in a tire width direction in a tread surface (1); sipes (9) narrower than the grooves, the sipes formed in each of the blocks (7); and plural projections (21) provided, in a middle region (M) in a depth direction of each sipe (9), on one sidewall surface (13) of the sipe (9), and having different projecting directions toward the other sidewall surface (15) of the sipe (9).

Abstract: A pneumatic tire exhibiting high traction performance. A center circumferential groove (14) is provided on the equator (CL) of the tread (12), and between shoulder circumferential grooves (18) on both sides of the center circumferential groove (14) are arranged first lateral grooves (20) formed at a smaller angle relative to the axial direction of the tire than the first lateral groove (20). One end of each first lateral groove (20) and one end of each second lateral groove (22) are made to merge at a shoulder circumferential groove (18), and shoulder lateral grooves (23) are arranged on the outer side of each shoulder circumferential groove (18). Each shoulder lateral groove (23) extends from the merging portion toward a tread end (12E) and is formed at a smaller angle relative to the axial direction of the tire than that of the first lateral groove (20). Because the angle of the shoulder lateral grooves (23) relative to the axial direction of the tire is less, traction performance of the tire increases.