Abstract: An object of the invention is to provide a tire and a method of producing the tire, in which tire breakage of a groove fence in vulcanization molding and generation of cracks at a groove bottom can be suppressed, noise is relatively low and uneven wear is less likely to occur. At least one of a groove wall 71 surface of the circumferential groove 222 and a side wall 43 surface of a stepped land portion 41 is provided with a groove fence 51 which are formed in the extending direction of the circumferential groove at a predetermined intervals therebetween such that the groove fence protrudes in the groove widthwise direction of the circumferential groove.

Abstract: A pneumatic tire includes first and second laterally spaced sides, and a tread interposed between the sides. The tread includes a tread surface having at least one groove. The groove includes first and second facing sidewalls separated by a groove bottom surface. A series of serrations or ribs extend over at least a portion of a height of the facing sidewalls. The serrations extend at a non-perpendicular angle relative to the tread surface and the serrations/ribs on the first and second sidewalls of the groove are opposed to each other.

Abstract: Provided is a pneumatic tire which achieves both of excellent wet traction and wear resistance from an early stage to an advanced stage of wear. Multiple dent parts are formed, at certain intervals in a tire circumferential direction, in both side walls of each of at least two land portions of multiple land portions being formed in a tread surface and extending in the tire circumferential direction. Each of the dent parts has a smaller depth than main grooves that define the land portion where this dent part is formed. Multiple sipes are formed to traverse the land portion in a tire width direction between the right and left dent parts opposed to each other. Each of the sipes has a greater depth in both end regions opening to the dent parts than in a center region thereof.

Abstract: A plurality of sipes extending in a tire width direction are provided in a tread surface of a block. In the sipes, protrusions are formed on a first sipe wall surface of mutually opposing sipe wall surfaces and recesses that engage with the protrusions are formed on a second sipe wall surface. Collapse of portions of the block sandwiched by the sipes is suppressed due to engagement of the protrusions and the recesses. A height of protrusions positioned on an upper portion in the depth direction of the sipes is greater than a height of protrusions positioned on a lower portion.

Abstract: A heavy duty tire comprises a tread portion provided with four or five circumferential grooves so as to axially divide the tread portion into five or six rib portions. The five or six rib portions are a pair of shoulder rib portions each provided with shoulder lateral groove, and three or four crown rib portions each provided with crown lateral grooves. The crown lateral grooves extend across the entire width of the crown rib portion. The shoulder lateral grooves extend axially outwardly from an axially inner edge of the shoulder rib portion so as to terminate at an axial distance of from 78 to 88% of the axial width of the shoulder rib portion from the above-mentioned axially inner edge. The depth of the circumferential grooves is 15 to 20 mm. The depth of the crown lateral grooves is 9 to 30% of the depth of the circumferential grooves. The depth of the shoulder lateral grooves is 9 to 25% of the depth of the circumferential grooves. The tread width TW is in a range of 0.78 to 0.

Abstract: A vehicle wheel tire includes a tire tread having a circumferential center tread region in which block elements are arranged in a symmetric pattern on opposite sides of a tire circumferential equatorial centerplane. The tread has one or more circumferential grooves bounded by edges of opposing block elements, pairs of opposed block elements having a block edge facing the groove and an array of saw-teeth formed along the groove-facing edge of opposed block elements inclined in the radial direction. The saw-teeth on a block edge of one opposed block element incline in a direction opposite to the inclination direction of saw-teeth on opposite opposed block element. A block element on the center tread region side of the groove has multiple circumferentially spaced apart and laterally extending sipes extending across the block element. The sipes extend to and align with the array of saw-teeth along the groove-facing edge of the block element.

Abstract: A tread for a tire, this tread having a tread surface intended to come into contact with a road surface and comprising at least one groove of width W and of depth P delimited by two walls facing one another, these walls being joined together by a groove bottom, at least one groove comprising at least one flexible device for at least partially closing this groove as it passes through the contact patch, each flexible device comprising at least one blade of a suitable thickness that allows it to flex under the effect of a circulation of liquid, this blade being borne by a wall delimiting the groove, each blade of thickness E being bounded by a bottom wall facing the bottom of the groove, an end wall facing the other wall of the groove and a contact wall intended to come into contact with the road surface and lateral walls spaced apart by a distance equal to the thickness E of the blade, this tread being such that the bottom wall of the blade comprises a first part referred to as connection part and a second part

Abstract: The invention provides a pneumatic tire which can increase a driving performance on a road surface of a so-called sherbet snow, and in which a biased wear such as a toe-and-heel wear or the like is hard to be generated. In a pneumatic tire provided with a tread pattern having a transverse groove 2b formed between a plurality of blocks 1b, the transverse groove 2b is provided with a top side groove portion 11 extending while a groove width GW expands to a tread end side, and a bottom side groove portion 12 extending with a roughly fixed groove width GW.

Abstract: In a tire 1, a central land portion row 20C and intermediate land portion rows 20M are formed by center-side main grooves 10C. A projecting portion 50 projecting outwardly in a tire radial direction TR from a groove bottom surface 11 of the center-side main groove 10C is provided in the central groove 10C. The projecting portion 50 is located on an extension line L1 extending in an extending direction of lug grooves 30M, and extends outwardly in the tread width direction TW from a sidewall 21 of the central land portion row 20C. An inner end height H1 of the projecting portion 50 located on an innermost side thereof in the tread width direction TW and continuous to the central land portion row 20C is greater than an outer end height H2 of the projecting portion 50 located on an outermost side thereof in the tread width direction TW.

Abstract: 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.

Abstract: In a tread part, a land part (block) partitioned by a main transverse groove is provided with a thin groove having a narrower groove width than the main transverse groove and extending in a tire width direction. On a groove lateral face which is one of opposing groove lateral faces of the thin groove, ridges projecting toward the other groove lateral face and extending in a depth direction of the thin groove are provided. A plural number of the ridges are provided in parallel to each other at intervals in a length direction of the thin groove, and an extending length in the depth direction is set up to include at least two kinds.

Abstract: Tire having a tread pattern with superior performance characteristics. The tread pattern includes ribs and circumferential grooves which are at least one of tapered and/or generally V-shaped. The walls of each circumferential groove have a wavy and/or sinusoidal contour extending in a generally circumferential direction.

Abstract: A component Fin toward an axial inner direction of the tire which is an opposite direction from an axial outer direction of the tire is applied to a force acting on a kicking end 16B of a land portion 16. With this, abrasion of the kicking end of the land portion can be moderated, and a biased abrasion resistance can be enhanced. A groove wall 20 of a lug groove 14 is provided with a step portion 22, a tread side groove width WA in a tread side of the step portion is widened toward an axial outer side of the tire, and a width WS of the step portion 22 is increased toward the axial outer side of the tire, thereby suppressing the lift from the road surface 26 at the tread-in end 16A of the land portion 16.

Abstract: A thin groove 4 that continuously extends in the tread circumferential direction is provided in a shoulder rib 3. An annular groove 8 continuous in the circumferential direction is provided in a groove wall 4a on the tread equatorial surface side of the thin groove 4 to be contiguous to the groove bottom, in a cross section taken in the width direction of the tread.

Abstract: Apparatus for ejecting objects from a tire tread include, in particular embodiments, a pair of adjacent ground-engaging elements, each element including a ground-engaging contact surface; a groove separating the pair of ground-engaging elements, the groove having a base and a pair of opposing sidewalls spaced apart by a groove width; a sipe having a particular size, and located in communication with a portion of the groove extending between the pair of ground-engaging elements; and, an ejector associated with the sipe, the ejector comprising a projection that extends within the groove.

Abstract: Tire comprising a tread having a tread surface (11) and comprising a plurality of grooves (2) of generally circumferential orientation and of depth H, these grooves (2) defining a plurality of rubber elements (3, 30), at least one of which comprises a plurality of cavities (6), each cavity (6) of volume Vc of generally elongate shape with a total length Lc and being designed to communicate with a single groove (2) of generally circumferential orientation, each cavity (6) being extended all the way along its length Lc by an incision (80) which extends radially outwardly to emerge at the tread surface (11), this tire being such that the incision (80) comprises an incision portion (81) beginning at the cavity and forming an angle A of at least 10° with a line perpendicular to the tread surface and passing through the point of intersection of the incision with the cavity (6).

Abstract: A pneumatic tire is provided that has enhanced traction performance. A shoulder main body portion of a first shoulder block is formed with a step portion projecting out in a tire circumferential direction. A height of the step portion is set lower than a height of a tread face of the shoulder main body portion and higher than the height of a lug groove. The step portion extends from a tire equatorial plane side end portion of the shoulder main body portion, beyond a tire width direction ground contact edge, to a tire shoulder portion.

Abstract: Tyre comprising a tread, this tread including a rolling surface (12) intended to come into contact with the ground, at least one circumferential row of upstanding elements (11), these upstanding elements (11) being separated from one another in the circumferential direction by incisions (20) of transverse or substantially transverse orientation, each incision (20) of transverse or substantially transverse orientation leading onto the rolling surface (12) and having a depth P, each incision (20) forming, on the rolling surface of the tyre when new, two facing edges (21, 22), these edges (21, 22) delimiting at least one narrow portion (30) of the incision, i.e. a portion having a mean width LE less than or equal to 2 mm, and at least one wide portion (40) of the incision, i.e.

Abstract: 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.

Abstract: A pneumatic tire has a first wall surface faces one side of a circumferential groove, and a second wall surface faces another side of that. The first wall surface alternately has a first inclined surface portion and a first concave portion. The second wall surface alternately has a second inclined surface portion and a second concave portion. A first land portion has a first connection portion connected to a second land portion and a first bottom surface portion constitutes the bottom of the circumferential groove. The second land portion has a second connection portion connected to the first land portion and a second bottom surface portion constitutes the bottom of the circumferential groove. The first inclined surface portion and the second inclined surface portion are alternately arranged along a tire circumferential direction overlapping with each other and a see-through region of the circumferential groove is formed between them.

Abstract: A pneumatic tire has a unidirectional tread pattern comprising right-hand and left-hand crown circumferential grooves and a crown rib formed therebetween. The crown rib is provided with first and second V-shaped grooves arranged alternately in the tire circumferential direction. The first V-shaped grooves extend from the left-hand crown circumferential groove. The second V-shaped grooves extend from the right-hand crown circumferential groove. The first and second V-shaped grooves are terminated within the rib, and their V-shape configurations have bending points substantially positioned at the tire equator.

Abstract: A pneumatic tire has a sipe is formed in a land portion of a tread surface. The sipe has a wide region in which a sipe width is made larger than a tread at position which is at a distance from the tread. The wide region is constructed by alternately providing a concave groove extending in a depth direction of the sipe in both sides of a sipe wall surface along a longitudinal direction of the sipe.

Abstract: A land block (100) has: a side surface (101) (which constitutes a lateral side surface section) forming a groove wall of a lateral groove (40A); and a side surface (102) (which constitutes a circumferential side surface section) forming a groove wall of a circumferential groove (20A). A protrusion (200) protruding from the side surface (101) in the circumferential direction (tc) of the tire and extending in the radial direction of the tire is formed in the region (101a) of the side surface (101) which is located at a position further toward one side of the side surface (101) in the width direction of the tread than the center of the side surface (101) in the width direction (tw) of the tread.

Abstract: This pneumatic tire has a plurality of lateral grooves, wherein each of the lateral grooves has a first side wall, a second side wall, a bottom surface and a groove width. A plurality of protrusions extending from the first side wall towards the second side wall; and a plurality of protrusions extending from the second side wall towards the first side wall. The protrusions are configured to prevent the lateral grooves from fully closing in the contact patch during rotation of the tire through the contact patch.

Abstract: To enhance cornering performance on each road surface and improve steering stability while ensuring traction performance and breaking performance of a pneumatic tire on a snow road or off-road. A shoulder land row (31) between a main groove (11) extending in the tire peripheral direction of a tread unit (2) and a tread end (TE) is partitioned into plan-view trapezoidal blocks (31B) with their widths reducing toward the outer side of a tire width direction by shoulder lug grooves (26) in an almost tire width direction. A plan-view trapezoidal notch (40) with its width reducing toward the inside of a block (31B) is formed in almost the center of the main groove (11) side edge of a block (31B), and an inclined surface (41) extending from the surface of the block (31B) toward the bottom of the main groove (11) is formed in the notch (40) integrally with the block (31B). This inclined surface (41) is formed stepwise by a plurality of recessed curved surfaces and protruding ridges formed between them.

Abstract: The present invention has an object to provide a pneumatic tire having a sipe, which can increase ice braking performance without reducing anti-wear performance. The pneumatic tire includes: a plurality of land portions 4 partitioned by grooves 2 and 3 and formed in a tread surface 1a; and at least one sipe 5 formed in each of the land portions 4, wherein the sipe 5 is formed so that sipe inner wall surfaces 6 and 6 are formed perpendicularly to the tread surface 1a, one or more recesses 7 exposed on the tread surface 1a are formed in at least one of the sipe inner wall surfaces 6 and 6 opposed to each other, the recess 7 has a sectional area gradually decreasing from an opening end of the sipe 5 toward a sipe bottom 8 and converges on the sipe inner wall surface 6 before reaching the sipe bottom 8.

Abstract: A pneumatic radial tire according to the present invention has a tread pattern specifying a tire rotation direction and an optimized shape of a groove wall on a kicking-out side of a lateral groove.

Abstract: An object of the present invention is to provide a pneumatic tire which prevents not only partial wear but also clack generation in land portion of tread surface. In order to achieve the object, the land portion is formed with a first type sipe having a step portion extending in a width direction of the tire on one sipe wall surface and a second type sipe having a step portion extending in the width direction of the tire on a sipe wall surface facing in the opposite direction of the first type sipe as viewed in the circumferential direction of the tire.

Abstract: A pneumatic tire includes a tread portion; three or more circumferential direction grooves; width direction grooves; and lines of land portions. When a tread center area and tread shoulder areas are sectioned at centerlines of the circumferential direction grooves in outermost sides in the tire width direction, a ratio G=(A+B)/X of a sum A+B of a groove area A of the circumferential direction grooves and a groove area B of the width direction grooves to a contact area X of the tread portion is in a range of G?0.25, a ratio S=B/(A+B) of the groove area B to the sum A+B is in a range of 0.25<S<0.45, a ratio Gs=C/Y of a groove area C of the tread shoulder areas to a contact area Y of the tread shoulder areas is in a range of Gs<0.20, and the ratio G and the ratio Gs have a relation of Gs<G.

Abstract: A tire tread 2 for a vehicle tire has a plurality of tread elements 10 extending radially outwardly from a tread base 24 to a radially outer surface. Each tread element 10 is defined by adjacent grooves 12, 14. The tread 2 has at least one tread element 10 projecting from the tread base 24 and having one or more tread wear indicators TWI 20. Each TWI 20 is located at the intersection of two grooves 12, 14 adjacent or integral to the at least one tread element 10.

Abstract: This invention relates generally to tires having treads that have a configuration and/or properties for maintaining hydroplaning resistance and improving rolling resistance, and, more specifically, to a tire that has a tread with bridged areas found in its lateral grooves that are configured to maintain hydroplaning resistance and snow traction while also improving rolling resistance.

Abstract: Provided is a pneumatic tire capable of yielding excellent water-draining performance, while reducing air column resonance. This pneumatic tire (1) has a tread (3) and at least one ply (2) arranged toward the interior of the tread in the radial direction. The tread has at least one main channel (4) and a flexible fence (5) formed inside the main channel. The main channel has a bottom (413) and opposing first and second wall surfaces (411, 412). The flexible fence extends along the width of the main channel so as to block at least 70% of a cross sectional area of the main channel, and is arranged at intervals so that at least one is present in the main channel in the tread footprint when the tire rolls. A plurality of recesses having an opening that opens in the main channel are formed on the bottom, first wall surface and/or second wall surface of the main channel, the flexible fence being connected to the recess and extending into the main channel via the opening of the recess.

Abstract: A pneumatic tire is molded by using a vulcanizing mold in which blades 20, each composed of a metal thin plate having an inclined portion 20a in the depth direction and a plurality of through holes 20G with the same sectional form as that of projections to be formed in the sipe in the inclined portion 20a are buried in a groove portion corresponding to the tire block of the vulcanizing mold, thereby forming 3D sipes having unevenness in the radial direction of the block and a plurality of pairs of projections in the inclined portion in the block of the tire. Thereby, when longitudinal force is applied to the tire, adjacent small blocks of the block come into close contact with each other only at the positions of the projections of the 3D sipes, thereby making it possible to ensure the block stiffness of the pneumatic tire 10 without reducing the drainage function.

Abstract: A pneumatic tire having improved braking performance includes sides and a tread section between the sides. In each of two regions on opposite sides of a tire centerline in the tread section, two circumferential main grooves extend along a tire circumferential direction in a zigzag shape, first lug grooves extend from an inner circumferential main groove to a pattern end, and second lug grooves extend toward the pattern end from the outer circumferential main groove. A wall of the inside circumferential main groove includes wall surfaces with a wall angle varying along the circumferential direction. An outside land section between the main grooves includes a notched lug groove extending in a tire widthwise direction from either the inside or outside main groove and closes within the outside land section. A groove depth of the notched lug groove is shallower than that of the first and second lug grooves.

Abstract: 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.

Abstract: Provided is a pneumatic tire having a tread surface in which two circumferential direction main grooves continuous in a tire circumferential direction are arranged on left and right sides of a tire center, and land portions are defined by the circumferential direction main grooves as ribs or blocks having lug grooves. Multiple fine grooves are provided in each of right and left walls of the circumferential direction main groove, the fine grooves being inclined to the tire circumferential direction and provided in regions along the circumferential direction main groove, covering at least 50% of the entire circumference thereof in total. In each of the two circumferential direction main grooves on corresponding tire shoulder sides, the fine grooves in the right and left walls are inclined to the tire circumferential direction in the same direction in a plan view in a tire radial direction.

Abstract: A tire tread produced from a rubber composition having a shore A hardness between 58 and 65, inclusive, and provided with a rolling surface, configured to be in contact with the ground, and with a tread pattern formed from motifs in relief, the tread having a plurality of incisions of width WI between 0.3 mm and 2 mm, inclusive, and a depth DI, each incision being delimited by at least two separate rubber walls, at least one of said incisions being delimited by at least one wall provided with at least one protuberance with a maximum thickness TMAX projecting from said wall in order to reduce the width of the incision, the protuberance extending, in the direction of the depth DI of the incision, between an internal depth DPI and an external depth DPE, the internal depth DPI and the external depth DPE being non-zero and the maximum thickness TMAX being greater than or equal to 40% of the width WI of the incision.

Abstract: 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.

Abstract: A pneumatic tire having on-snow performance improved by increasing traction performance on snow-covered road with maintaining dry grip performance high, and comprising tread surface 2 having at least one circumferential main groove 3 in an outer region 2o facing outward of a vehicle, the circumferential main groove 3 being a straight groove wherein ridge lines 21 at which groove wall surfaces 20 intersect with the tread surface 2 extend straight, each groove wall surface 20 comprising a gently-inclined upper wall surface 20U extending from the ridge line 21 at an angle ?1 of 40 to 60° with respect to a normal line to tread surface 2 and a steeply-inclined lower wall surface 20L extending to groove bottom 22 at an angle ?2 smaller than the angle ?1, and the lower wall surface 20L including projections 23 which are disposed at intervals in the circumferential direction and have a triangular cross section with slope surface 23S extending from lower end Ue of the upper wall surface 20U to groove bottom 22 at an a

Abstract: 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.

Abstract: A pneumatic tire (10) is provided with air chambers which have recessed portions (221), and also with constriction grooves which communicate with the air chambers and a circumferential groove (21), and the air chambers and the constriction grooves are formed in a rib-shaped land portion of the tire. The depth (DP1) of a recessed portion (221) measured from a land portion (211) making contact with the road surface is deeper at one end of the air chamber in the tire circumference direction than the other end of the air chamber. The height of the recessed portion (221) from the bottom surface (222) thereof to the ground contact surface varies in the circumferential direction of the tire. The volume of the space formed by a constriction groove and the road surface is less than the volume of the space of the air chamber formed by the recessed portion (221) and the road surface.

Abstract: Provided is a pneumatic tire having snow performances which are capable of being enhanced without sacrificing its running performance on dry road surfaces. A pneumatic tire of the invention includes two first main grooves, a plurality lateral grooves and a plurality of sipes in a tread part. In the pneumatic tire, a groove wall surface, of each first main groove, closer to a tire equatorial line is formed so as to cyclically repeat, in the tire circumferential direction, a change in an inclination angle of the groove wall surface to a direction normal to a tread, the change being a gradual increase from a minimum value of 0° to 15° to a maximum value of 15° to 45°. In places where the inclination angel of the groove wall surface, of the first main groove, closer to the tire equatorial line, is at its maximum, no lateral grooves communicate with the first main groove, and in the places, the other groove wall surface, of the first main groove, closer to a corresponding contact end extends uninterruptedly.

Abstract: A pneumatic tire has a tread surface is provided with a groove portion, and a land portion sectioned by the groove portion. In wall surfaces facing the groove portion in the land portion, an inside wall surface facing an inner side at a time of being installed to a vehicle is formed by a zigzag surface, and an outside wall surface facing an outer side at a time of being installed to the vehicle is formed by a flat surface.

Abstract: Tire tread provided with circumferential grooves delimiting two edge rows provided with a plurality of transverse grooves, those of one edge row forming at least one bearing block protruding on at least one delimiting wall, each comprising a surface capable of coming into contact with another surface during contact with the ground and at least one passageway for a fluid between each bearing block of a groove and the bottom of the groove. For each edge row, the mean surface indentation ratio Tc is at least 0.7 and at most 1.6 times E/R, where E is the mean thickness for all grooves comprising active surfaces measured between a radially outermost point of the active surface and a radially outermost point of the reinforcing belt, R is the mean distance for all transverse grooves comprising active surfaces measured between the point of the active surface that is radially outermost and the rotation axis of the tire provided with the tread.

Abstract: A pneumatic vehicle tire includes a tread rubber that is divided into tread elements, such as tread bars or circumferential ribs, by circumferential grooves and transverse grooves. A groove flank of a circumferential groove facing away from an outer shoulder runs at a first angle of inclination relative to the radial direction, and a groove flank opposite the groove flank facing away from the outer shoulder includes two flank portions respectively running at a second angle of inclination and a third angle of inclination relative to the radial direction. The radially inner flank portion has elevations that form a ribbed structure.

Abstract: A pneumatic tire includes a pair of first circumferential main grooves formed in the center region of a tread, a pair of second circumferential main grooves formed respectively outward of the corresponding first main grooves, a plurality of first lug grooves which each extend from one of the two shoulder ends of the tread inward in the tire-width direction and communicate with the corresponding first main groove, a plurality of second lug grooves alternately arranged in the tire circumferential direction which each extend from one of the two shoulder ends of the tread inward in the tire-width direction but do not communicate with the corresponding first main groove, a center rib defined between the pair of first main grooves and extends continuously in the tire circumferential direction, a shoulder block row defined between each of the second main grooves and a corresponding one of the shoulder ends and includes a plurality of blocks, and an intermediate block row defined between each of the first main groove

Abstract: Tire for heavy goods vehicle having a tread comprising a plurality of circumferential grooves delimiting intermediate ribs and two edge ribs each circumferential groove comprising a plurality of protuberances formed as a protrusion on at least one lateral wall delimiting this groove, wherein: facing each protuberance, a half-closed notch has an axial length La at most equal to 60% of the minimum width Ln of this rib, and a width Le at most equal to the width Lr of the groove oriented so as to make an average angle B at least equal to 10 degrees with the main direction of the protuberance, each protuberance closes the section of the groove in which it is formed over at least 35% and at most 75% of the surface of the said section, a functional clearance (J1, J2) is arranged between the protuberance and the walls delimiting the half-closed notch.

Abstract: A tire for a heavy goods vehicle, having a tread having a tread surface provided in the new state with at least one groove delimited by opposing side walls, this groove opening onto the tread surface in a discontinuous manner by way of a plurality of portions that are open towards the exterior of the tread, these open portions having two ends that are extended under the tread surface by channels having inlets connected to the ends of the open portions, these inlets to the channels having a mean surface area S. This tread is such that each open portion on the tread surface is provided at each of its ends with a closure device for partially closing the cross section of the inlets to the channels when the tire is running and for leaving a passage unclosed.

Abstract: In a pneumatic tire, a single block includes a first sipe and a second sipe each extending in a tire width direction and disposed at a predetermined pitch in a tire circumferential direction. The first sipe and the second sipe include a first sipe portion that has a linear form when the block is viewed planarly, and a second sipe portion that has a zigzag shape when the block is viewed planarly and that connects to the first sipe portion. The first sipe portion includes a pair of sipe wall faces that face each other and have a linear form when viewed as a cross-section from a direction perpendicular to a sipe length direction, and includes a protrusion disposed on a first face of the sipe wall faces and a recess disposed on a second face of the sipe wall faces so as to mate with the protrusion.

Abstract: 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.