摘要:
A tread of elastomeric material for tires, this tread being provided with a plurality of incisions, each incision of average width e being defined by facing walls, this tread being characterized in that at least one of the walls defining each incision comprises at least one first series and one second series of lines of motifs forming reliefs relative to said wall and having a maximum height measured perpendicular to said wall at least equal to {fraction (1/10)} of the width e, each series of lines comprising a plurality of lines extending in the same direction, the lines of the first series intersecting the lines of the second series, and in that at least one of the walls is provided over its entire surface with an average roughness of between {fraction (1/100)} and {fraction (1/10)} of the width e of the incision.
摘要:
In a pneumatic tire, a uneven wear-preventing narrow groove 4 is formed on a tread surface 2a extending from a tread edge E in a tire circumferential direction inside a tire axial direction at a small distance L. At least a groove bottom surface 4b of the narrow groove 4 and an outer groove wall surface 4o outside of the tire axial direction are formed of crack-resistant layers 9 made of crack-resistant rubber material Cg having excellent crack-resistance. A thickness t1 of the crack-resistant layer 9 perpendicular to the groove bottom surface 4b at right angles in a tire radial direction is set to 1 to 5 mm, and a thickness t2 perpendicular to the outer groove wall surface 4o at right angles is set to 1 to 6 mm.
摘要:
The present invention relates to a tyre designed to be fitted on the driving axles of a motor vehicle for medium or heavy transport. This tyre is provided with a tread (3) comprising a plurality of full-depth transverse grooves (9) and four circumferential series of inclined incisions (5, 6, 7, 8) which delimit five circumferential rows of lugs, namely two axially outer rows (11, 12), two intermediate rows (13, 14), and one central row (10) lying essentially across the equatorial plane. Each transverse groove (9) extends across the whole width of tread, and consists of a central portion (20), located between a pair of consecutive lugs (19) of the central row (10), and a pair of lateral portions (21, 22), located between pairs of consecutive lugs (40) of the intermediate and shoulder rows. The two lateral portions (21, 22) of each transverse groove are staggered circumferentially with respect to each other and penetrate into the body of the central row (10) of lugs.
摘要:
A heavy duty radial tire which is provided with traverse grooves extending between the tread edges and longitudinal grooves extending between the traverse grooves so as to form shoulder blocks arranged along each of the tread edges and inner blocks each disposed on the axially inside of one of the shoulder blocks. The longitudinal grooves between the shoulder blocks and the inner blocks have a depth Wga of 0.7 to 1.0 times the depth Dy of the traverse grooves, and the longitudinal grooves are each inclined at an acute angle with respect to the circumferential direction to have an axial extent range Y whose axial width W1 is in a range of from 1.0 to 10.0 times the depth Wga. In a cross section of the tire under a normally inflated unloaded condition, the tread profile is made up of a center profile Si and a shoulder profile So. The shoulder profile So extends continuously from each of the axial ends of the center profile Si through an inflection point P to one of the tread edges. The center profile Si is a circular arc of a radius Rc having the center on the tire equatorial plane, and the shoulder profile So is a substantially straight line or alternatively an arc having less curvature than the center profile Si. The inflection point P is located within the axial extent range Y of the longitudinal grooves.
摘要:
A tyre for a vehicle wheel includes a carcass structure, a belt structure, and a tread band. The tread band pattern includes a central zone and two axially-opposite shoulder zones. The central zone is delimited between axially-inner circumferential grooves and includes at least two intermediate circumferential grooves and a plurality of first transverse recesses inclined relative to a circumferential direction of the tyre. The first transverse recesses are connected to at least one of the intermediate circumferential grooves. The shoulder zones are each delimited between axially-inner and axially-outer circumferential grooves. The shoulder zones include a plurality of second transverse recesses inclined relative to the circumferential direction. The at least one of the intermediate circumferential grooves includes a substantially V-shaped cross-section. A width and depth of the at least one of the intermediate circumferential grooves are greater than and less than, respectively, a width and depth of the first transverse recesses.
摘要:
The tire has a plurality of radially outer rubber components defining a radially outer surface (S1) exposed to fluids having a relative displacement with respect to the rotating tire. At least one radially outer component has projections, the projections being defined by first sides (2) and second sides (2null) of unequal length. The first sides (2) have a greater length, delimiting therebetween an angle null ranging from 5null to 60null and forming at their intersection an apex (P). The projections protrude by a height (h) from the radially outer surface (S1) from which said first and second sides originate, the height (h) ranging from 0.2 to 100 micrometers. In more than 75% of the projections, any plane tangent to the first side (2) of the projection cuts the radially outer surface (S1) at an acute angle.
摘要:
A pneumatic tire comprises a tread portion comprising tread elements each provided with a sipe, the sipe having an open top end and a bottom, and in a range from the open top to a certain depth, a configuration of the sipe in a plane parallel with the tread face comprising a zigzag part oscillating in the longitudinal direction of the sipe in the course from the open top to said certain depth.
摘要:
A tire tread comprises an intermediate portion disposed between two shoulder portions. The tire tread has an expanded void area with a width and length of 1.2 to 5 times the average width of a non-circumferential groove in the tread. In the illustrated embodiment, the expanded void area is in the intermediate portion of the tread and the void area is divided into two branches which are separated by an island of tread rubber. The illustrated island has a length and a variable width, and has rounded leading and trailing ends. The island is also disposed at an angle with respect to the centerline (CL) of the tread. In the illustrated embodiment, the tread has a circumferential aquachannel, and the islands and the aquachannel are in close proximity to one another.
摘要:
A pneumatic tire comprises a tread portion, a pair of sidewall portions, a pair of bead portions, a carcass extending between the bead portions, a breaker disposed radially outside the carcass, and a band disposed radially outside the breaker and composed of a full width ply extending across the substantially overall width of the breaker and a pair of axially spaced edge plies. In a ground contacting face of the tire under a normally inflate loaded condition which face has axially outermost edges between which the ground contacting width TW is defined, the circumferential length LS of the ground contacting face at an axial position 10% of TW axially inwards of each of the axially outermost edges is in a range of from 75 to 85% of the circumferential length Lc of the ground contacting face at the center of the ground contacting width. The tread portion is provided on each side of the tire equator with a circumferentially continuously extending inner circumferential groove and the tread portion is divided into a crown part between the inner circumferential grooves and a pair of outer parts axially outside the inner circumferential grooves, and the crown part is formed as a substantially continuously extending circumferential rib.
摘要:
A tire tread comprising grooves defining motifs in relief, at least one of these motifs being provided with first and second incisions, said incisions each being defined by two main lateral surfaces connected by an end surface, each of the first incisions opening on to the running surface of the tread when new and extending at most as far as the depth, and each of the second incisions extends at least as far as the depth. The tread is characterized in that the bottom surfaces of the first incisions and the apex surfaces of the second incisions are functionally arranged such that, whatever the level of wear the length of the ridges on the running surface is at least equal to 75% of the length of the ridges when new.