Abstract: Tread (1) having tread surface (10) axially bounded by edge parts (11), and provided with cuts (3, 4) delimiting material parts forming raised elements (2), each raised element (2) comprising contact face (20), there being formed, in a plurality of raised elements (2), a ventilation cavity (5) having a depth at least equal to 70% of the thickness of the tread material to be worn away, each ventilation cavity (5) being delimited by wall surface (50) ending at bottom surface (530). Each ventilation cavity (5) comprises first cavity part (51) continued into the depth by second cavity part (52). The first cavity part (51) is situated between the tread surface and intermediate depth level H1 situated at between 30% and 70% of maximum depth H of ventilation cavity (5), the mean relief angle A of the wall is at least equal to 20 degrees. In the second cavity part (52), mean relief angle B of the wall is at most equal to 15 degrees.

Abstract: A method and/or article is used for repairing of a worn, damaged, punctured or sliced but otherwise functional vehicle tire, for example on the sidewall of the tire. An external patch includes a layer of adhesive applied directly to the slice or puncture and a patch portion that is applied to an exterior surface of a vehicle tire. A separate adhesive affixes the patch portion to the exterior surface of the tire. The adhesive is in contact with a contact surface of the patch portion and also with the exterior surface of the tire. The adhesive may not form a continuous layer, but may hold the patch to the tire by discrete anchor points of adhesive, the anchor points being separated by adhesiveless areas.

Abstract: A tire uniformity correcting drum comprises: a lower drum to be in contact with a portion of an inner circumferential surface of a tire; an upper drum provided to be movable up and down with respect to the lower drum and configured to press another portion of the inner circumferential surface of the tire which is not in contact with the lower drum; and a hydraulic driving unit configured to connect the lower drum and the upper drum and move up and down the upper drum with respect to the lower drum. A contact area of the upper drum with the inner circumferential surface of the tire is smaller than a contact area of the lower drum with the inner circumferential surface of the tire.

Abstract: A carcass sleeve including a carcass ply and a pair of annular anchoring structures is fitted around a toroidal forming drum arranged in a first radially contracted operational condition. The carcass sleeve is toroidally shaped against a radially inner surface of an annular contrast element. The forming drum is positioned inside the carcass sleeve and is concurrently expanded towards a second operational condition. Upon reaching the second operational condition, the toroidally shaped carcass sleeve is coupled to the forming drum. The forming drum, coupled to the carcass sleeve, is adapted to be transferred in proximity of an application device of additional components externally to the carcass sleeve.

Abstract: A tread (10) for a heavy truck tire having a groove (14) with a bottom (16) and a stone ejector (18) located within the groove (14) that extends upwards from the groove bottom (16) wherein the stone ejector (18) has a front side (20), a back side (22) and an upper surface (24) that extends at different distances upwards at different locations on the upper surface (24) such that a first location (26) on the upper surface (24) is located closer to the back side (22) and extends a longer distance upwards than a second location (28) on the upper surface (24) that is located closer to the front side (20).

Abstract: A method for controlling the discharge of fluids during a process for vulcanization and moulding of a green tire includes the steps of: building at least one portion of a radially internal surface of a green tire by winding of a continuous elongated element of elastomeric material into a plurality of coils confining circumferential grooves along the rolling direction of the tire; disposing the circumferential grooves into fluid communication with discharge channels present in the radially external surface of a pressing bladder disposed in a radially internal cavity bounded by the green tire.

Abstract: A pneumatic tire includes rib-shaped land parts adjacent to each other with a circumferential groove therebetween, and raised-row-shaped projections projecting toward each other from both mutually opposed side wall surfaces of the adjacent rib-shaped land parts are provided to extend in the tread circumferential direction. As compared to a raised-row-shaped projection in an outermost-side circumferential groove located on a tire width direction outermost side, a raised-row-shaped projection in an inner adjacent circumferential groove located on tire width direction inner side of and adjacent to the outermost-side circumferential groove is formed at a shallower position near a tread surface between the tread surface and the groove bottom.

Abstract: A tire includes first and second laterally spaced sides and a tread interposed between the first and second sides. The tread includes a tread surface having at least one groove therein, the at least one groove including facing, first and second sidewalls separated by a groove bottom surface. A first pocket region of recessed serrations extends over at least a portion of the first sidewall and a second pocket region of recessed serrations extends over at least a portion of the second sidewall. The serrations of the first and second pocket regions are staggered in a circumferential direction relative to one another.

Abstract: A process for building tyres employing a forming drum having circumferentially consecutive sectors that are radially movable between a contracted condition and an expanded condition in which the sectors are radially moved away from a geometric axis in order to define a radially external abutment surface. Each sector has circumferentially opposite coupling portions each having circumferential projections alternated with circumferential cavities. The projections of each sector are slidably engaged in the respective cavities of circumferentially adjacent sectors. From at least one of the projections, at least one support wing is extended having a first side and a second side that are respectively opposite. The first side coincides with a portion of the abutment surface and the second side at least partially overlaps one of the projections belonging to an adjacent sector.

Abstract: Disclosed is a method and an assembly for applying a tire component onto a receiving member. The method includes the steps of: receiving the tire component on the apply member; detecting a plurality of leading endpoints at the leading edge and detecting a plurality of trailing endpoints at the trailing edge in-line with the leading endpoints in the longitudinal direction; determining the distance in the longitudinal direction between the leading endpoint and the trailing endpoint for each pair of endpoints; driving the apply member at an apply speed in a transfer direction to transfer the tire component onto the receiving member while driving the receiving member at a receiving speed; and adjusting the ratio between the apply speed and the receiving speed during the transfer of the tire component in the order in which the pairs of endpoints are spliced to improve the relative positioning of each pair of endpoints for splicing.

Abstract: A process for retreading a tire, the process comprising the steps of providing a tire casing; providing a cured rubber component having first and second planar surfaces, where the first planar surface includes a tread pattern; providing a cushion gum, wherein the cushion gum is a composition including a functional polymer including at least one functional group, and a crosslinking agent including at least two moieties that will react with the functional group of the functional elastomer; applying the cushion gum to the tire casing; applying the second planar surface of the cured rubber to the cushion gum to form a tire composite; and treating the tire composite to thereby form a retread tire.

Abstract: A pneumatic tire is provided in which an inner tie rubber layer and an outer tie rubber layer are selectively disposed between a carcass layer and an innerliner layer in a region on both sides in a tire width direction excluding a center region of a tread portion. End portions of the inner tie rubber layer and outer tie rubber layer on a tire equator side are disposed within a range of from 10 mm to 25 mm on an inner side in the tire width direction from an end portion on an outermost side in the tire width direction of a belt layer. A rubber thickness t1 of the inner tie rubber layer differs from a rubber thickness t2 of the outer tie rubber layer. A rubber thickness of the outer tie rubber layer is from 120% to 200% a rubber thickness of the inner tie rubber layer.

Abstract: A pneumatic tire includes circumferential grooves aligned in a lateral direction and extending in a circumferential direction, lateral grooves aligned in the circumferential direction and extending to cross the circumferential direction, communicating at ends with the circumferential grooves and defining a block-shaped land portion between the circumferential grooves, two narrow grooves aligned in the lateral direction and extending in the circumferential direction, communicating at ends with a lateral groove and dividing the land portion defined by each of the circumferential grooves and each of the lateral grooves into small land portions, the narrow grooves having a smaller groove width than the circumferential grooves and being formed with a bent portion in an intermediate portion, the bent portion being disposed inward in the lateral direction, and bend points of the bent portions being disposed at positions offset from one another in the circumferential direction.

Abstract: A carcass sleeve is situated in a radially external position with respect to a toroidal forming drum, arranged in a first radially contracted operative condition. The carcass sleeve is shaped according to a toroidal configuration while the forming drum is positioned inside the carcass sleeve. During shaping of the carcass sleeve, the forming drum is radially expanded up to a second radially expanded operative condition. Upon completed shaping, the carcass sleeve is coupled to the forming drum in the second operative condition. The forming drum, coupled to the shaped carcass sleeve, is arranged in proximity to at least one device for building at least one belt layer at a radially external position relative to the shaped carcass sleeve.

Abstract: A tire including a bead core, a bead filler extending to an outer side in a tire-radial direction of the bead core, and a carcass play extending from the bead core to another bead core and folded back around the bead core, further including a steel chafer arranged so as to cover the carcass ply around the bead core, a first pad which covers outside in the tire-width direction of a folding end of the carcass ply at the outside in the tire-radial direction of an end part of the steel chafer, and a second pad which covers the outer side in the tire-width direction of the first pad, in which an electronic component is provided between the first pad and second pad.

Abstract: Provided is a pneumatic tire comprising a tread, sidewalls, a belt, and dimpled patterns, wherein each dimpled pattern is adapted to modify air flow and temperature. The tread defines the outward surface of the tire and extends in a radial direction, a circumferential direction, and a lateral direction. Each sidewall extends radially inwardly along a curved path from the tread to a bead and defines a lateral surface having maximum lateral extent. The belt extends under the tread. Each dimpled pattern is a surface treatment etched from a sidewall maximum lateral extent over a belt edge and onto the tread. Each dimpled pattern surface treatment modifies air flow at 180 mph over the tire to turbulent flow, and reduces steady state operating temperatures of the sidewalls.

Abstract: A tyre includes a tread portion provided with circumferentially extending main grooves and land portions. The main grooves include an outboard crown main groove, and an inboard crown main groove. The land portions include a crown land portion defined between the outboard crown main groove and the inboard crown main groove. The crown land portion is provided with first crown sipes having first ends connected to the outboard crown main groove and second ends terminating within the crown land portion, and second crown sipes having first ends connected to the inboard crown main groove and second ends terminating within the crown land portion, wherein the first crown sipes are inclined with respect to a tyre axial direction in a same direction as the second crown sipes, and the first crown sipes and the second crown sipes are different in angle with respect to the tyre axial direction.

Abstract: A tire comprises a tread portion provided with two circumferential grooves disposed one each side of the tire equator and extending continuously in the tire circumferential direction, and a shoulder land region defined on the axially outside of each of the two circumferential grooves. The shoulder land region is provided with oblique grooves inclined with respect to the tire axial direction. The oblique grooves include first oblique grooves having axially inner ends, and second oblique grooves having axially inner ends positioned axially outside the axially inner ends of the first oblique grooves.

Abstract: A rib-like land section partitioned by main grooves, a plurality of sub-grooves provided in the rib-like land section at intervals in the tire circumferential direction and a groove hole provided between the sub-grooves adjacent to each other and extending in the tire circumferential direction are provided in a tread section. The sub-groove includes a lateral groove portion, in which one end opens to the main groove and the other end terminates inside the rib-like land section, and a longitudinal groove portion extending from the other end of the lateral groove portion to one side in the tire circumferential direction and terminating inside the rib-like land section. The groove hole is formed so that a groove depth at one end part close to a terminal end of the longitudinal groove portion becomes shallower than a groove depth at the other end part far from the terminal end.

Abstract: A method for controlling the thickness of a continuous elongated element made of elastomeric material, applied according to coils wound on a forming support, includes: advancing a head end of the continuous elongated element toward the forming support; subjecting, during the advancement, the continuous elongated element to a first stretching with a first stretch coefficient before applying on the forming support; and subjecting, during the advancement, the continuous elongated element to a second stretching with a second stretch coefficient during the application on the forming support. During the first stretching, a span of the continuous elongated element adjacent to the head end is stretched with a supplementary stretch coefficient greater than the first stretch coefficient, in a manner so as to confer, also to the span adjacent to the head end, a stretch and a section similar or substantially equivalent to those of the rest of the continuous elongated element.