Patent application number | Description | Published |
20080295937 | Pneumatic Tire - A sipe is formed in a block provided in a tread surface, wide portions extending in a sipe length direction are formed in each of a kick-out side and a step-in side of the sipe, and a total of heights of the wide portions in the kick-out side of the sipe is made larger than a total of heights of the wide portions in the step-in side of the sipe. | 12-04-2008 |
20090050248 | PNEUMATIC TIRE - A sipe formed in a block of a tread surface is provided with a first sipe portion having a first wide portion, a second sipe portion having a second wide portion in a different side from the first wide portion in a sipe width direction and positioned close to a sipe bottom portion side of the first sipe portion so as to become wider than the first sipe portion, and a third sipe portion having a third wide portion in the same side as the first wide portion in the sipe width direction and positioned close to a sipe bottom portion side of the second sipe portion so as to become wider than the second sipe portion. | 02-26-2009 |
20090078350 | PNEUMATIC TIRE - A pneumatic tire structured such that a sipe is formed in a land portion of a tread surface. The sipe has a wide portion extending along a longitudinal direction at least at one position in a depth direction. The wide portion is structured by alternately arranging concave portions which are smaller in the longitudinal direction and the depth direction than the sipe, in both sides of a sipe wall surface along the longitudinal direction of the sipe. | 03-26-2009 |
20090165911 | PNEUMATIC TIRE - An object of the present invention is to provide a pneumatic tire capable of reducing the narrowing of the openings of sipes and increasing ground-contact performance by ensuring the edge effect and the water removal effect thereby increasing on-ice braking performance while providing a satisfactory durability to a sipe-forming blade mounted on the tire manufacturing die. To achieve the above object, each of the sipes formed in a land portion of a tread surface which a pneumatic tire comprises has: a first sipe portion in which a first wide portion having a bottom portion thereof is formed, a second sipe portion in which a second wide portion having a bottom portion thereof and extending in a depth direction from a depth position closer to the tread surface side than the bottom portion of the first wide portion is formed at the side opposite to the first wide portion as viewed in a sipe width direction, the second sipe portion being positioned on the side of the bottom portion of the first sipe portion, and a third sipe portion in which a third wide portion having a bottom portion thereof and extending in a depth direction from a depth position closer to the tread surface side than the bottom portion of the second wide portion is formed at the same side as the first wide portion as viewed in a sipe width direction, the third sipe portion being positioned on the side of the bottom portion of the second sipe portion. | 07-02-2009 |
20100170601 | Pneumatic Tire - In a pneumatic tire, at least one groove wall face of at least one of the grooves includes a portion located at the tread surface side and a portion located at a groove bottom side with respect to the portion located at the tread surface side, the portion located at the tread surface side includes a plane face that forms a right angle or an obtuse angle with respect to the land portion surface, and a bottom face extending outward in a width direction of the groove from an end at the groove bottom side of the plane face, the portion located at the groove bottom side has an inclined face extending from the groove bottom in the width direction toward the outside of the bottom face, the inclined face and the bottom face form therebetween a recess portion recessed outward in the width direction of the groove. | 07-08-2010 |
20100206447 | Pneumatic Tire - An object of the present invention is to provide a pneumatic tire that ensures both of the on-ice braking performance and the dry braking performance. In order to achieve the object, a pneumatic tire comprises a tread surface including a land portion in which a plurality of sipes are formed, wherein each of the sipes includes a reference plane extending in a depth direction of the sipe from a wavy or zigzag line in the surface of the land portion and each of the sipes is formed with a convex portion having a convex shape in a vertical section with respect to the reference plane in a top area at the front side and the rear side thereof. | 08-19-2010 |
20100288408 | Pneumatic Tire - A pneumatic tire with improved steering stability without raising air columnar resonance noise level is provided. The pneumatic tire comprises upper thin grooves | 11-18-2010 |
20110290392 | PNEUMATIC TIRE - A sipe extending in a tire width direction is provided in a land part (block) of a tread shoulder region, and the sipe is configured to include a first sipe part, a second sipe part having a groove width larger than the first sipe part and a third sipe part larger than the second sipe part. The first sipe part is formed over the whole of a sipe length direction in an opening side region of the sipe and the whole of a sipe depth direction in an inner region on the side of a tire equator; the third sipe part is formed in an outer region on the side of a tread ground contact end in a sipe bottom part region; and the second sipe part is formed in a region between the first sipe part and the third sipe part. | 12-01-2011 |
20110315289 | PNEUMATIC TIRE - A sipe extending in a tire width direction is provided in a land part (block) of a tread shoulder region. An inner region on the tire equator side in a length direction of the sipe is formed in a straight sipe portion over the whole of a sipe depth direction. A region on the tread ground contact end side relative to the inner region is divided and provided in the straight sipe portion on the sipe opening side and a waveform sipe portion on the sipe bottom part side in the sipe depth direction. | 12-29-2011 |
20120090748 | PNEUMATIC TIRE - A pneumatic tire comprises a plurality of main grooves extending along a tire circumferential direction, and shoulder lateral grooves extending to an outer side in a tire width direction from a shoulder main groove positioned in an outermost side in the tire width direction among the main grooves, the main grooves and the shoulder lateral grooves being arranged on a tread surface, wherein a depression is formed on a wall surface of a land portion facing to the shoulder lateral groove, in a state in which it is not exposed to a surface of the land portion, and wherein the depression is formed in such a manner that a height of the depression in a depth direction of the shoulder lateral groove is reduced toward an inner side in the tire width direction, and an exposure length of the depression becomes longer in accordance with a progress of an abrasion of the land portion. | 04-19-2012 |
20120090749 | PNEUMATIC TIRE - In a pneumatic tire in which the sipe extending in a direction crossing a tire circumferential direction is provided on a land portion (block) of a tread portion, a wide part having a wide groove width is provided at three or more places in a length direction of the sipe, and the wide part and a narrow part are formed alternately on a tread surface along the sipe length direction. A plurality of the wide parts are extended in a sipe depth direction from the tread surface, and are provided by changing extended lengths in the sipe depth direction. | 04-19-2012 |
20120103484 | PNEUMATIC TIRE - A wear indicator provided on a tread surface is constituted of seven sipes of an uppermost sipe, a lowermost sipe and an intermediate sipe, each extending in a lateral direction; and an upper-left sipe, an upper-right sipe, a lower-left sipe and a lower-right sipe, each extending in a longitudinal direction. The sipe uses a combination of an indication part used to indicate a character, and a non-indication part having a narrower groove width and not used to indicate a character, in a depth direction of the sipe. Single numeral is indicated by the combination of the indication parts in the seven sipes, and the combination of the indication parts is changed in the depth direction of the sipe such that the numeral stepwise changes in the depth direction of the sipe. | 05-03-2012 |