Abstract:
To make it possible to enhance uneven wear resistance while maintaining drainage performance, a pneumatic tire includes a left-right asymmetric tread pattern having a designated mounting orientation with respect to a vehicle. Vertical grooves include an inner shoulder circumferential groove disposed on an innermost side of the vehicle, and an outer shoulder circumferential groove disposed on an outermost side of the vehicle. Lateral grooves include inner shoulder lateral grooves and outer shoulder lateral grooves. The inner shoulder lateral groove includes a first inner shoulder lateral groove which extends inward in a tire axial direction from an outer side of a vehicle-inner side tread edge and terminates without reaching the inner shoulder circumferential groove, and a second inner shoulder lateral groove which extends inward in the tire axial direction from an outer side of the vehicle-inner side tread edge and opens in the inner shoulder circumferential groove.
Abstract:
A pneumatic tire including a closed sipe in a land portion 3 formed in a tread surface, provided with at least three cuts extending in a radiation direction from an imaginary axis that extends in a depth direction of the land portion, and that terminate in the land portion. The cuts are provided with a spiral-like twist in the depth direction, centered on the imaginary axis, and a twist angle thereof is not less than 10° and not more than 135°. Additionally, a length in the radiation direction of the cuts or a width of the cuts is formed larger at a tread surface side than at a bottom surface side.
Abstract:
A structure for a tread pattern of a pneumatic tire includes a radially extending pedestal, a first set of cylindrical voids extending radially through the pedestal, a second set of cylindrical voids extending radially through the pedestal, and a radially extending void ring circumscribing the pedestal.
Abstract:
A pneumatic tire of the invention includes: a stepped-shaped raised area provided in the main groove positioned at a center area of the tire so as to be continued circumferentially of the tire, connected to either the main groove walls, and raised from the groove bottom; and a ridge lower than a tread surface of the tire in each of the main grooves on both outsides of the main groove at the center area of the tire so as to be raised from the center of the groove bottom continuously along the length thereof without being joined with the groove walls, and the angle of inclination of the main groove walls with respect to the normal line of the tangential line on the tread surface of the main groove portion is parallel to each other or is 5° or smaller.
Abstract:
A pneumatic tire having improved wear resistance, especially improved uneven wear resistance (such as river wear), is offered. The tire that is a rib-pattern tire has five ribs extending circumferentially of the tire. The ribs include a center rib and intermediate ribs located on the opposite sides of the center rib that is located on the equator line of the tire. Closed sipes are formed at least in the center rib and in the intermediate ribs. Each sipe is located in the lateral center of the corresponding rib. Both ends of each sipe terminate within the corresponding rib. The closed sipes are successively offset circumferentially among the ribs and arranged in a periodic pattern on the outer surface of the tire. The closed sipes in the ribs are so arranged that when they are optically projected onto the equator line of the tire, the sipes do not overlap circumferentially of the tire among the ribs.
Abstract:
A heavy-duty tire comprises a tread portion provided with at least three circumferentially continuously extending ribs divided by at least two circumferential grooves extending straight in the tire circumferential direction, wherein the ribs have side edges adjacent to the circumferential grooves; each of the side edges is provided with edge sipes at intervals in the tire circumferential direction; each of the edge sipes extends parallel with the tire axial direction from the adjacent circumferential groove and terminates in the rib; each of the edge sipe has an axial length in a range of not less than 5% but not more than 15% of the axial width of the rib, a thickness in a range of not less than 0.3 mm but not more than 1.0 mm and a depth in a range of not less than 50% but not more than 100% of the depth of the circumferential groove; and the total number of the edge sipes per tire is in a range of from 4 to 8 times the value of the tire diameter in millimeter.
Abstract:
A pneumatic tire has a plurality of upper surface sipes formed on an upper surface of the block and arranged in parallel so as to be spaced in a sipe width direction, and a wall surface sipe extending along a tire diametrical direction in a wall surface positioned in a longitudinal direction of the upper surface sipe. The wall surface sipe is arranged between a pair of adjacent the upper surface sipes.
Abstract:
A tire having sipes is provided. The tire includes a circumferential tread configured with at least one rib bound by at least one groove. The rib has a plurality of sipes that extend from the groove into the rib wherein one or more of the sipes narrow in a direction from the groove into the rib.
Abstract:
To provide a pneumatic tire excellent in both traction performance and braking performance on ice and snow road surfaces. A large number of blocks (26) of same-shape partitioned by main grooves and lug grooves are formed on a tread part (16). The tread part (16) comprises a center block row (32) and second block rows (34L) and (34R). Each of the blocks (26) comprises a plurality of sipes (30). Also, Gt=S/(Sa+Sb×0.6), and Gu=S/(Ds×L+Sb×0.6) are calculated for the each block where the area of the outer wall of the block (26) is (Sa) and the overall area of the sipes (30) on the block (26) is (Sb). Also, when the total sum (Gt) which is the total sum of (Gt) in three block rows and the total sum (Gu) which is the total sum of (Gu) in three block rows are calculated, the requirements 0.95≦Total Sum Gt≦1.05 and 1.30≦Total Sum Gu≦1.60 are satisfied.
Abstract:
A pneumatic tire including sipes that have at least one ends positioned within blocks. The sipes are arranged such that each of the sipes meanders from the one end to the other end thereof to form a meandrous shape, and as the depth of the sipes increases, the meander width of the sipes gradually increases from their openings to at least the 80%-worn position of the blocks. The sipes each have a sipe length L, which is defined as a center line length between an intersection of a center line passing the center of the meander width of the meandrous shape with a first straight line and an intersection of the center line with a second straight line, the first straight line being orthogonally drawn to the center line from the one end of the sipe and the second straight line being orthogonally drawn to the center line from the other end of the sipe at the same depth position of the sipe, the sipe length L gradually decreasing as the sipe depth increases. The ratio L80/M0 of the sipe length L80 at the 80% worn position to the opening length M0 of the sipes is in the range of 0.8 to 0.95, and the ratio M80/M0 of the actual length M80 of the sipes at the 80% worn position to the opening length M0 is in the range of 1.0 to 1.15.