Abstract: A tread portion of a pneumatic tire includes a pair of first main grooves extending in a tire circumferential direction formed at a position on either outer side in the tire lateral direction of a first land portion including a tire equatorial plane; a pair of second main grooves extending in the tire circumferential direction formed at a position outward from the first main grooves in the tire lateral direction; and first lug grooves formed in a second land portion between the first main grooves and the second main grooves, the first lug grooves opening to one of the first main grooves at one end and opening to one of the second main grooves at an other end. The first lug grooves have a groove width of 2 mm or greater and have the same inclination direction in the tire lateral direction with respect to the tire circumferential direction.

Abstract: A tire having an equatorial plane and a circumferential tread is provided. The tread includes at least one recess defined by at least one concave surface having a plurality of sipes formed therein. Optionally, the at least one concave surface can include one or more channel disposed therein.

Abstract: A tire, wherein, a lateral groove (7) is disposed between a predetermined land block (5) and a land block (6) adjacent to the land block (5) in the tire circumference direction, among land blocks (4, 5, 6), and is formed of an inner lateral groove (Q) and an outer lateral groove (P), the inside lateral groove (Q) being disposed at an inside of a boundary of a bent portion (12) in a tire width direction, the outside lateral groove (P) being disposed at an outside of the bent portion (12), the bent portion (12) being formed at intermediate portion in the tire width direction. The angle ?1 of the inner lateral groove (Q) relative to the tire circumference direction is smaller than the angle ?2 of the outer lateral groove (P) relative to the circumference direction.

Abstract: A pneumatic tire is configured such that: paired first main grooves extending in a tire circumferential direction are provided on the two sides of a tire equator line in a tread portion, respectively; a distance between a center position of each first main groove and the tire equator line is set at 8% to 20% of a ground contact width W; a first land portion is defined between these first main grooves; multiple sub-grooves each having a curved shape are formed in each of both edge portions of the first land portion at intervals in the tire circumferential direction; one end of each sub-groove is opened to the corresponding first main groove, and the other end of the sub-groove is terminated inside the first land portion; a rib portion continuously extending in the tire circumferential direction is formed in an area of the first land portion on the tire equator line; and a relation between a length (L) of a center line of each sub-groove and a pitch length (P) of the sub-grooves in the tire circumferential dire

Abstract: Embodiments are directed to a pneumatic off-road tire having an inner shoulder, an outer shoulder and a tread therebetween. The tread has a central axis and includes a plurality of generally curved first grooves. Each first groove has a first end disposed near the outer shoulder and a second end disposed near the inner shoulder so that each first groove crosses the central axis. The first end is spaced circumferentially from the second end. A plurality of second grooves, each connecting the second end of a first groove to a first end of another first groove, are included. The first and second grooves define a cascading repetition of tread blocks. Chamfers are defined on certain corners of the tread blocks that are adjacent to the first grooves and that expose a tread block wall following the chamfer, relative to a rotation of the tire, to an off-road contact surface.

Abstract: A pneumatic tire comprises a tread portion (2) provided with a wavy circumferential groove (7) and a plurality of axial grooves (4). At the junction (5) of each axial groove (4) with the wavy circumferential groove (7), a acute-angled corner (6) is formed. At the junction (5), the axial groove (4) has a toe-side edge (4r) intersecting a junction-side edge (7a) of the wavy circumferential groove (7) at a first point (P1), and a heel-side edge (4f) intersecting the junction-side edge (7a) at a third point (P3).

Abstract: A tire having a tread wherein a first shoulder region includes a plurality of shoulder blocks that are circumferentially separated by shoulder transverse grooves. A central region includes a plurality of substantially transverse grooves extending from a first circumferential groove toward the equatorial plane, wherein two circumferentially consecutive substantially transverse grooves delimit a central area. The central area includes a first central block; a second central block having one side forming a part of the wall of the first circumferential groove; and a third central block circumferentially shifted with respect to the first central block and positioned at a distance from the first circumferential groove, the third central block being separated from the second central block by a central transverse groove which is inclined with respect to the equatorial plane. The substantially transverse grooves have respective end portions at a distance from the equatorial plane.

Abstract: A pneumatic tire (10) has an inner shoulder (11), an outer shoulder (12) and a tread (13) therebetween. The tread has a central axis (A) and includes a plurality of first grooves (14). Each first groove has a first end (15) disposed near the outer shoulder and a second end (17) disposed near the inner shoulder so that each first groove crosses the central axis. The first end is spaced circumferentially from the second end. A plurality of second grooves (16) is provided with each second groove connecting the second end of a first groove to a first end of another first groove. The first and second grooves define a cascading repetition of tread blocks (18). Chamfers (20) are defined on certain corners of the tread blocks that are adjacent to the first grooves.

Abstract: A tire having an equatorial plane and a circumferential tread is provided. The tread includes at least one recess defined by at least one concave surface having a plurality of sipes formed therein. Optionally, the at least one concave surface can include one or more channel disposed therein.

Abstract: Provided is a pneumatic tire in which left- and right-side lateral grooves extend between first main grooves and second main grooves, and in which left- and right-side sub grooves extend halfway from the second main grooves toward the first main grooves. The lateral grooves and the sub grooves are disposed alternately with each other at predetermined pitches in tire circumferential directions. The left- and right-side lateral grooves respectively include: first groove portions extending from the first main grooves; and second groove portions extending from the second main grooves while curving inwardly toward tire width directions. The left- and right-side lateral grooves are offset from each other in the tire circumferential directions. Opening portions at both ends of each of the lateral grooves, which are opened to the first main grooves and the second main grooves, are shifted from one another in the tire circumferential directions.

Abstract: This invention provides a tire for agricultural vehicles that employs a tread design having a flattened contact surface across the width and a plurality of curved lugs that alternately extend from each sidewall to a location nearly adjacent to the opposing side wall. Each lug curves so that a central section at the center of the tire width is located on the surface ahead on the circumference of adjoining sections of the lug that extend toward each of the opposing sidewalls. In this manner, each lug appears to have a curved “banana” shape that extends across the width of the tire contact surface in a generally axial alignment. The grooves between lugs extend generally axially across the width, as a result. They are narrowed, having a circumferential width that is between approximately 20% and 30% of the average circumferential width of a lug. This geometry places more lug surface in contact with the road for better handling and longer tread life and provides less groove space to retain mud and detritus.

Abstract: Provided is a pneumatic tire in which improvement is achieved in a wet performance and reduction in vehicle exterior noise while ensuring a dry performance.

Abstract: A pneumatic tire having improved wet performance without sacrificing steering stability. A pair of central circumferential main grooves 14 and a pair of side circumferential main grooves 16 are arranged on a tread 12, to obtain a fundamentally high level of wet performance. A plurality of central land portion row lateral grooves 20 is formed at both sides of a central land portion row 18 to be spaced away from each other substantially at a constant distance, to enhance wet performance. Central land portion row chamfer portions 24 are formed at obtuse angle portions of the central land portion row 18. The central land portion row chamfer portions 24 drain water between a tread surface and a ground-contact surface into the respective central circumferential main grooves 14 adjacent thereto, whereby wet draining performance is enhanced.

Abstract: Winter tire for vehicle wheels, provided with a tread comprising three circumferential grooves and a plurality of transverse grooves which jointly delimit four circumferential rows of blocks, namely two axially outer shoulder rows and two center rows at the sides of the equatorial plane. The transverse grooves converge on the equatorial plane in the direction of rolling specified for the tire. In the tread, each transverse groove of the center rows is made to comprise a widening of the cross section with an essentially circular profile, formed at a distance from the ends, for trapping snow. To obtain quieter running on dry roads, the front transverse edge profiles of the adjacent blocks of the center rows are made to comprise at least two successive curvilinear portions. These curvilinear portions are shaped in different ways and with opposite curvatures to each other, to form means of attenuating the noise arising from the impact of the tread pattern on dry roads when the tire is rolling.

Abstract: A tire for a wheel of a vehicle includes a casing structure, a belt structure, and a tread band. A tread band pattern includes a central zone, two intermediate zones, and two shoulder zones. Each of the zones extends between planes that are substantially parallel to an equatorial plane of the tire. Each intermediate zone includes first and second sequences of pairs of transversal grooves. The first sequence pairs are alternated with the second sequence pairs. The grooves of the two sequences are inclined relative to each other. The first sequence grooves extend from first ends, at respective axially intermediate planes, to second ends, at predetermined first distances from selected second sequence grooves. The second sequence grooves extend from third ends, at respective axially inner planes, to fourth ends, at predetermined second distances from selected first sequence grooves. Intermediate zones include a zigzag rib. Shoulder zones include additional transversal grooves.

Abstract: The tread of a multipurpose tire includes a central region and first and second shoulder regions. Circumferential grooves separate the central and shoulder regions. The central region includes first and second rows of blocks. The first and second rows are arranged between an equatorial plane of the tire and either of the circumferential grooves. The first row is separated from the second row by first and second grooves extending in first and second oblique directions relative to the equatorial plane. The first oblique direction is substantially perpendicular to the second oblique direction. Each first groove is connected to two second grooves at essentially T-shaped junctions. At least two blocks of the first row are separated from each other by a third groove substantially parallel to the second oblique direction. The third groove is connected to a first groove at an end of the first groove nearest the equatorial plane.

Abstract: A high-transverse-curvature tire (1), in particular to be mounted on the front wheel of a motor-vehicle, which includes a belt structure (6) including, in a radially external layer (9a), a plurality of circumferential coils (7a), axially arranged side by side, of a cord (7) wound at a substantially zero angle with respect to the equatorial plane (X—X) of the tire. An area occupied by rubber blocks (10) formed in a portion of the tread band (8), having a length equal to the pitch (p) of the tread pattern and a width equal to the axial development of the tread band (8), is between 70% and 90% of the total area of the portion.

Abstract: A pneumatic tire having a tread pattern is provided, in which occurrence of uneven wear observed in a conventional lug-type tread pattern can be prevented without causing degradation in the various characteristics of the tire. The pneumatic tire having a tread pattern in which main lug grooves are disposed in the opposing tread shoulder regions at a predetermined pitch in the circumferential direction of the tire. The main lug grooves are so arranged as to provide circumferential phase difference between the opposing tread shoulder regions. In this construction, a narrow shallow groove is disposed in the central region of the tread portion in the tread width direction for connecting the main lug grooves located in the opposing tread shoulder regions, and a shallow groove portion is formed in the shoulder end region inside the main lug groove.

Abstract: A tire comprises a tread portion in which a mold parting line by a single-split mold runs on or near the tire equator. In a central part of the tread portion in which tread grooves are provided, the groove edges which are stroked by tire mold's protrusions for making the tread grooves when the mold is opened are provided with a chamfer backed by a recess and/or the groove walls extending from such groove edges are provided with a variable inclination, whereby demolding defects can be reduced.

Abstract: A pneumatic tire comprising a tread portion provided with oblique grooves to define narrow and circumferentially long blocks therebetween, the oblique grooves inclined at angles &thgr; of not more than 60 degrees with respect to the circumferential direction of the tire, each of the long and narrow blocks provided with at least tow sipes each extending across the block from one of the adjacent oblique grooves to the other, while inclining reversely to the oblique grooves, to subdivide the block into at least three block pieces.

Abstract: A pneumatic tire comprises a tread portion provided between the tire equator and each tread edge with a continuous main circumferential groove and outer lateral grooves, the outer lateral grooves including alternately arranged wide lateral grooves and narrow lateral grooves each extending axially outwardly from the main circumferential groove, the axially inner groove-wall of the main circumferential groove extending substantially straight in the circumferential direction, the axially outer groove-wall of the main circumferential groove comprising circumferential portions and inclined portions, the circumferential portions extending substantially straight so that the width of the main circumferential groove is substantially constant, and the inclined portions inclined so that the width of the main circumferential groove increases from the narrow lateral grooves to the wide lateral grooves.

Abstract: A tire for a vehicle having at least one wheel at each corner, the tire comprising a non-longitudinal ground contacting tread extending axially between first and second axial edge regions and having tread grooves formed therein, wherein in the first axial edge region of the tread, the tread grooves are oriented substantially in the tire circumferential direction and in the second axial edge region of the tread the grooves are oriented substantially in the tire axial direction and in a third axial region of the tread axially between the first and second edge regions the orientation of the grooves changes progressively from circumferential to axial.

Abstract: A tyre includes a tread band having at least two substantially parallel longitudinal grooves and at least one series of transverse grooves crossing the longitudinal grooves. The transverse and longitudinal grooves delimit at least two rows of shoulder blocks and at least one row of centre blocks. The transverse grooves have at least two transverse channels, each including an outer end stretch in an orientation substantially perpendicular to an equatorial plane of the tyre and a curvilinear connecting stretch close to the equatorial plane. The joining of laterally-opposite transverse channels gives each transverse groove a continuous course. At least one transverse channel of at least one of the transverse grooves also includes an inner end stretch. The connecting stretch interconnects the outer end stretch with the inner end stretch in a continuity relationship.

Abstract: A pneumatic tire having improved wet traction has two annular aquachannels. The tire has a wide, substantially square footprint, a distinctive tread pattern, and a new tread compound, and exhibits good QGL wet traction in addition to excellent hydroplaning properties. The tire also has good handling and wear properties.

Abstract: A pneumatic tire having an improved tread pattern which is capable of improving the steering stability, tire uniformity and the like without increasing a tread pattern noise is disclosed. The tire comprises rows of circumferentially arranged tread elements such as blocks, the tread elements in each row having plural kinds of different circumferential widths. The circumferential widths of the axial grooves and the circumferential lengths of the tread elements in each row satisfy 1.2≦GR/BR≦1.5 where BR is the length maximum ratio defined by the ratio (Bll/Bss) of the maximum circumferential length (Bll) to the minimum circumferential length (Bss), and GR is the width maximum ratio defined by the ratio (Gll/Gss) of the maximum circumferential width (Gll) to the minimum circumferential width (Gss).

Abstract: A pneumatic tire comprises a tread portion having a plurality of slant grooves, in which each slant groove has a steeply slant groove portion and a gently slant groove portion, and the steeply slant groove portion comprises a pseudo-land part of a given shape, and can improve a drainage performance without sacrificing the other tire performances.

Abstract: A tire for vehicle wheels, provided with a tread band, includes a plurality of raised blocks confined between at least two longitudinal grooves, at least two transverse grooves meeting the longitudinal grooves, and a first and second series of sipes formed in the blocks to divide each block into a plurality of flexible portions. The flexible portions have a grip edge in the form of an acute angle on the outer rolling surface of the tread band. Each of the transverse grooves is confined between a first side, substantially normal to the outer rolling surface of the tread band, and a second side, diverging from the first side toward the outer rolling surface of the tread band. The second side of each of the transverse grooves has an orientation concordant with that of the sipes of a corresponding block, relative to the outer rolling surface of the tread band.

Abstract: A pneumatic tire which comprises a tread portion provided on each side of the tire equator with axial grooves extending axially inwardly from the tread edges, the axial grooves inclined to one direction with respect to the tire axial direction to form a non-directional tread pattern, and the inclination angle of the axial grooves to the tire circumferential direction is decreased from the axially outer end to the axially inner end thereof so as to have a minimum inclination angle &bgr;min of less than 45 degrees, and a maximum inclination angle of from 60 to 85 degrees. Preferably, the radially outermost belt ply has a cord angle a of 10 to 35 degrees to the tire equator and the axial grooves inclined in the reverse direction to the belt cords, and |&bgr;min−&agr;|≦25 degrees.

Abstract: A vehicle tire comprises circumferentially extending straight main grooves including a central main groove on the tire equator and an axially outer main groove on each side thereof, first lug grooves extending from the axially outer main grooves towards the central main groove but not reached thereto, each of the first lug grooves comprising a first curved portion, a second curved portion and a straight portion arranged in this order from the outer main groove towards the central main groove, wherein a width of the first curved portion is in the range of from 60 to 80% of the width of the outer main groove, a width of the second curved portion is not less than 25% but less than 60% of the width of the outer main groove, and a width of the straight portion is not more than 25% of the width of the outer main groove, an inclination angle of each first lug groove with respect to the tire circumferential direction being in the range of from 30 to 50 degrees at the outer main groove, and gradually decreasing theref

Abstract: A tread for motor-vehicle tires has a raised pattern formed of a plurality of shaped blocks 7 distributed in circumferential rows 3, 4, 5, 6 disposed in parallel and in side by side relation. The number of the shaped blocks 7 arranged in each row gradually increases while moving from the equatorial plane X-X to the axial outer side edges 1a of the tread 1. Thus a gradual increase in the longitudinal stiffness of the shaped blocks 7 is achieved on passing from the side edges 1a of the tread 1 to the equatorial plane X-X, which brings about a reduction in the mobility of said blocks on the road contact patch and lower rolling noise.

Abstract: A sipe formed in a block is structured, in a depthwise direction of the sipe, by a narrow groove portion formed at a ground-contact surface side of the sipe and a wide groove portion formed at a bottom portion side of the sipe and wider than the narrow wide portion. A portion connecting the narrow groove portion and the wide groove portion is inclined along a longitudinal direction of the sipe. When a pneumatic tire having a tread surface on which such blocks are formed is worn, wear proceeds as follows. At an initial stage of wear during which draining performance of main grooves is excellent, only the narrow groove portion is exposed so that noise is suppressed. At an intermediate stage of wear during which draining performance of the main grooves deteriorates, the wide groove portion is gradually exposed, and the draining performance of the sipe improves to compensate for deterioration of the draining performance of the main grooves.

Abstract: A high-transverse-curvature tire (1), in particular for mounting onto the rear wheel of motor-vehicles, comprises a tread band (8), coaxially extended around a belt structure (6), wherein a plurality of rubber blocks (10), defined between a plurality of grooves (1 1) extending along a direction substantially transverse to the tire running direction (D), are formed which grooves comprise a bottom (12) connected to opposite inlet (13) and outlet (14) sidewalls. In an equatorial zone (E) of the tread band (8), the inlet wall (13) of the grooves (11) is inclined with respect to the bottom (12) of the same towards the tire rolling direction, and forms an angle (&agr;) of from 50° to 80° with respect to a plane (&pgr;) tangent to the bottom (12).

Abstract: A tread for motor-vehicle tires has a raised pattern formed of a plurality of shaped blocks 7 distributed in circumferential rows 3, 4, 5, 6 disposed in parallel and in side by side relation. The number of the shaped blocks 7 arranged in each row gradually increases while moving from the equatorial plane X—X to the axial outer side edges 1a of the tread 1. Thus a gradual increase in the longitudinal stiffness of the shaped blocks 7 is achieved on passing from the side edges 1a of the tread 1 to the equatorial plane X—X, which brings about a reduction in the mobility of said blocks on the road contact patch and lower rolling noise.

Abstract: An off-road pneumatic tire 10 having a tread 12 with a plurality of lugs 14, each lug 14 having a wide section 22 near at least one shoulder of the tread and a narrow section 24 crossing a centerline of the tread. In a preferred embodiment, each lug 14 having two wide sections 22, one extending from each shoulder 16, 18 of the tread 12 and being interconnected by the narrow section 24.

Abstract: A pneumatic agricultural tire (20) for an industrial type tractor or like vehicle has a plurality of central lugs (60) and a plurality of shoulder lugs (40, 50). The plurality of central lugs (60) are arranged in a circumferentially continuous row and extend across the equatorial plane (EP). Each central lug (60) is similar in shape and orientation relative to each circumferentially adjacent central lug (60). Each central lug (60) has a leading edge (51) and a trailing edge (52). The leading edges (51) of each lug (60) are located on an opposite of the equatorial plane relative to the trailing edge (52) of the same central lug (60). The plurality of shoulder lugs (40, 50) are divided into first and second rows and project radially outwardly from the inner tread (34) and extend from the lateral tread edges (33A, 33H) toward the equatorial plane of the tire (20).

Abstract: A vehicle tire includes a tread portion provided with a plurality of blocks and at least one circumferential rib, the circumferential rib having a first side face facing a circumferential groove and a second side face, and first side face being corrugated to form furrows and ridges which are arranged alternatively in the circumferential direction and extend radially of the tire, the corrugation having an amplitude Lb in the range of 0.5 to 2.0 mm, the circumferential rib being provided with sipes extending thereacross so that each sipe has an end opened in one of the furrows on the first side face and an end opened in said second side face, and the spacings La of the sipes being in the range of 2.0 to 5.0 mm. Each of the sipe has a zigzag middle part.

Abstract: A tire for a two-wheeled vehicle comprising a ground contacting tread having at least one tread groove formed therein and extending axially from the tread center to the tread edge, wherein in a first region of the tire tread, which is the central tread region and is the region of contact between the tire and the ground when the motorcycle is in the condition of moving in a straight line, the alignment of the tread groove is substantially circumferential, and in a second region of the tire tread, which is at the axial edge of the tread and is the region of contact when the motorcycle is in the condition of turning under maximum cornering, the alignment of the tread grooves is substantially transverse, and in a third region, which is the tread region between the first central region and the second axial region and which is the ground contacting region when the motorcycle is turning at less than the maximum cornering condition, the groove alignment changes progressively axially outwardly from substantially circu

Abstract: A tire for a vehicle having at least one wheel at each corner, the tire comprising a ground contacting tread extending axially between first and second edge regions and having tread grooves formed therein, wherein in the first axial edge region of the tread the tread grooves are aligned substantially in the tire circumferential direction and in the second axial edge region of the tread the grooves are aligned substantially in the tire axial direction and in a third axial region of the tread axially between the first and second edge regions the alignment of the grooves changes progressively from circumferential to axial.

Abstract: The described tread band (1) has laterally opposite transverse channels (6), each having a substantially rectilinear end stretch (6a) extending with an appropriate inclination from a respective outer side edge (1a), a connecting stretch (6c) of curvilinear extension and an inner end stretch (6b) terminating beyond the equatorial plane (X) and having a slightly inclined orientation relative the latter. The connecting stretch (6c) of each transverse channel (6) opens into the connecting stretch of a laterally opposite transverse channel, to define a transverse groove (3) of undulated extension. Also provided are two longitudinal grooves (2) consisting of substantially rectilinear stretches (2a) each extending between two transverse grooves (3) in a direction inclined to the equatorial plane (X). L-shaped auxiliary channels (8) are interposed in an alternate sequence relative to the transverse channels (6) defining grooves (3).

Abstract: A high-transverse-curvature tire (1), in particular to be mounted on the front wheel of a motor-vehicle, comprises a belt structure (6) including, in a radially external layer (9a), a plurality of circumferential coils (7a), axially arranged side by side, of a cord (7) wound at a substantially zero angle with respect to the equatorial plane (X--X) of the tire. The area occupied by rubber blocks (10) formed in a portion of the tread band (8) having a length equal to the pitch (p) of the tread pattern and a width equal to the axial development of the tread band (8), is between 70% and 90% of the total area of said portion.

Abstract: A pneumatic tire comprises a tread portion which is provided with a plurality of circumferential grooves extending continuously in the tire circumferential direction to axially divide the tread portion into a plurality of land portions, at least one of the land portions is provided with sipes each extending across the full width of the land portion to have a pair of open ends, each of the sipes is provided therein with at least three tie-bars to provide the bottom of the sip with at least three shallow parts in the open ends and therebetween and at least two deep parts between the shallower parts, and the depth (h2) at the shallow parts is set in the range of from 0.2 to 0.8 times the depth (h1) at the deep parts.

Abstract: A tread for motor-vehicle tires has a raised pattern formed of a plurality of shaped blocks 7 distributed in circumferential rows 3, 4, 5, 6 disposed in parallel and in side by side relation. The number of the shaped blocks 7 arranged in each row gradually increases while moving from the equatorial plane X--X to the axial outer side edges 1a of the tread 1. Thus a gradual increase in the longitudinal stiffness of the shaped blocks 7 is achieved on passing from the side edges 1a of the tread 1 to the equatorial plane X--X, which brings about a reduction in the mobility of said blocks on the road contact patch and lower rolling noise.

Abstract: A pneumatic tire having two main grooves in the tread that are provided symmetrically with the equatorial plane of the pneumatic tire and which extend in the circumferential direction of the pneumatic tire. The tread is divided into a central portion formed between the main grooves and shoulder portions formed outward of the main grooves in the direction of tire's width. Each of the central and shoulder portions is provided with a plurality of lateral grooves that extend in the direction of tire's width. The lateral grooves in the central portion and those in each shoulder portion are inclined in opposite directions with respect to the axial direction of the tire. All walls of the central lateral grooves are inclined in the same direction with respect to a line in the radial direction of the tire. All walls of the shoulder lateral grooves are inclined in opposite directions to the walls of the central lateral grooves with respect to a line in the radial direction of the pneumatic tire.