摘要:
A pneumatic tire has a tread that is provided with a plurality of blocks comparted in a tire circumferential direction by a lateral groove. A sipe formed in each of the blocks has a narrow portion that is open in a tread surface, and a wide portion that is communicated with an inner side in a tire diametrical direction of the narrow portion and is widened than the narrow portion. The wide portion gradually increases a widening length in one side in a width direction and gradually decreases a widening length in other side in the width direction, from one end portion of the sipe toward other end portion, and accompanies an angle change at a time of appearing on the tread surface due to a progress of a wear.
摘要:
The present invention provides a pneumatic tire that can exhibit high ice performance throughout a period of use of the tire, and can reduce a rejection rate without complicating production of the tire. The pneumatic tire includes: a plurality of land portions 4 partitioned by grooves 2 and 3 and formed in a tread surface 1a; and a sipe 5 formed in each of the land portions 4, wherein a plurality of first protrusions 7 are formed on only one of sipe inner wall surfaces 6 and 6 opposed to each other in the sipe 5, each of the first protrusions 7 continuing in a tire depth direction from the tread surface 1a to a sipe bottom 8 and protruding toward an opposite sipe inner wall surface, the first protrusion 7 is tapered toward the opposite sipe inner wall surface, a narrow portion 7a is provided between the tread surface 1a and the sipe bottom 8, and a second protrusion 9 protruding toward the opposite sipe inner wall surface is formed between narrow portions 7a of adjacent first protrusions.
摘要:
An object of the present invention is to provide a pneumatic tire that increases the on-ice performance while ensuring the on-dry road performance and the anti-abrasion performance without loosing advantages of radial sipes. In order to achieve the object, a pneumatic tire comprises a tread surface including a block formed with a plurality of radial sipes disposed radially, each of the radial sipes extends radially from a central area of the block and terminating in an edge area of the block, and the width of the sipes in the edge area of the block is larger than the width of the sipes in the central area of the block.
摘要:
The present invention provides a pneumatic tire that can exhibit high ice performance throughout a period of use of the tire, and can reduce a rejection rate without complicating production of the tire. The pneumatic tire includes: a plurality of land portions 4 partitioned by grooves 2 and 3 and formed in a tread surface 1a; and a sipe 5 formed in each of the land portions 4, wherein a plurality of first protrusions 7 are formed on only one of sipe inner wall surfaces 6 and 6 opposed to each other in the sipe 5, each of the first protrusions 7 continuing in a tire depth direction from the tread surface 1a to a sipe bottom 8 and protruding toward an opposite sipe inner wall surface, the first protrusion 7 is tapered toward the opposite sipe inner wall surface, a narrow portion 7a is provided between the tread surface 1a and the sipe bottom 8, and a second protrusion 9 protruding toward the opposite sipe inner wall surface is formed between narrow portions 7a of adjacent first protrusions.
摘要:
A pneumatic tire comprises grooves 1 to 3 formed in a tread and land portions 4 each having an acute angle portion 5 formed by the grooves 2 and 3. The acute angle portion 5 is chamfered by a plurality of chamfered surfaces 11 and 12 to form into a step shape by the chamfered surfaces 11 and 12 and a connecting surface 21 that connects the adjacent chamfered surfaces 11 and 12. Furthermore, from one sidewall to the other sidewall of the acute angle portion 5 at an end 6 of the acute angle portion 5, a height H1 of the chamfered surface 11 and a height H2 of the chamfered surface 12 are gradually decreased while a length L1 of the chamfered surface 11 and a length L2 of the chamfered surface 12 are gradually increased.
摘要:
A pneumatic tire has a tread pattern including a plurality of main grooves extending along a tire circumferential direction, and a shoulder land portion constructed by a rib or a block row formed in an outer side in a tire width direction of the main groove positioned in an outermost side. A circumferential sipe is provided in each of the shoulder land portions in both sides in the tire width direction. The number of the circumferential sipes provided in the shoulder land portion in a vehicle inner side is larger than the number of the circumferential sipes provided in the shoulder land portion in a vehicle outer side.