Abstract:
A radial tire for a motorcycle capable of having high road grip performance both when running at a high speed on a dry road surface and when cornering at a high speed, together with the high speed durability, especially a radial tire for a motorcycle with a large displacement to be used for road races, capable of maintaining these performances until the end of the races, is provided. The tilting angles of the cords 13a of said cross-belt 13 are set to 60 degrees or more to the circumferential direction, and a belt protecting layer 15 is disposed outside the spiral-belt 14, the belt protecting layer 15 having cords arranged in the direction tilted at 70 degrees or more to the circumferential direction.
Abstract:
A radial tire for a motorcycle capable of having high road grip performance both when running at a high speed on a dry road surface and when cornering at a high s]peed, together with the high speed durability, especially a radial tire for a motorcycle with a large displacement to be used for road races, capable of maintaining these performances until the end of the races, is provided. The tilting angles of the cords 13a of said cross-belt 13 are set to 60 degrees or more to the circumferential direction, and a belt protecting layer 15 is disposed outside the spiral-belt 14, the belt protecting layer 15 having cords arranged in the direction tilted at 70 degrees or more to the circumferential direction.
Abstract:
In a tire for motor-vehicles, an auxiliary support element (9) is interposed between a carcass ply (3) and a belt structure (6). The support element is employed during the manufacturing step of the belt structure (6) in order to stably retain, on the sectors of a comb drum (10), coils (7a) consecutively formed by winding of an inextensible cord (7) therearound. The auxiliary support element (9) is made in the form of an elastomeric sheet containing short aramid fibers in an amount included between 1 and 10 parts by weight per 100 parts of elastomeric material, to increase the stretchability of said element without impairing its adhesiveness. The introduction of the short aramid fibers in the blend enables the thickness of the auxiliary support element (9) to be reduced to about 0.075 mm.
Abstract:
A band element for mounting in the crown portion of a pneumatic tire to provide run flat ability to the tire in the event of loss of air pressure and to provide increased puncture resistance is formed of flat strips of tape having fibers embedded in a resin matrix which in one embodiment are twisted and then pultruded to provide a rectangular cross sectional configuration. The twisted tape is wrapped about a mandrel and forms either the only layer, or the intermediate layer of a composite band in combination with inner and outer layers of flat tape or wound filament fibers, whereby the fibers in the tape extend across the central axis of the band to reduce interlaminar sheer. In another embodiment, a plurality of dimples or depressions are formed in the individual tape layers to extend a plurality of the fibers across the layer boundaries to reduce interlaminar sheer.
Abstract:
A pneumatic belted tire for motorcycle is disclosed, which comprises as a casing reinforcement a carcass composed of at least one ply containing organic fiber cords arranged at 70.degree.-90.degree. with respect to the mid-circumference of the tire and a belt composed of a belt layer containing a cord with a modulus of elasticity of not less than 600 kgf/cm.sup.2 helically arranged at a slightly inclined angle with respect to the mid-circumference of the tire. In the tire of this type, the belt is composed of at least two belt segments parted at the mid-circumference of the tire and having a helically winding arrangement of at least one cord, and has a width corresponding to 0.5-1.1 times of a tread width, wherein the cord directions of these segments are opposite to each other with respect to the mid-circumference.
Abstract:
A tire with a crown comprising a strengthening reinforcement and at least one protective ply arranged above the strengthening reinforcement is characterized by the fact that the protective ply has the following features: it comprises a three-dimensional fabric impregnated with rubber; the fabric comprises warp threads and woof threads; the warp threads and the woof threads undulate; the warp threads and the woof threads are made with one or more materials whose rupture stress is less than 140 kg/mm.sup.2 ; and the porosity of the fabric before impregnation with rubber varies from 60% to 90%.
Abstract:
A breaker assembly for interposition between the carcass and tread of a pneumatic tire, is disclosed. The breaker assembly is substantially annular and comprises a single ply having a first pair of fold regions which divides the ply into a substantially Z- or S-shaped array of three webs superposed upon and axially continuous with one another, and a second pair of fold regions which further divides the ply into two additional webs each of which axially terminates in a circumferential edge and is superposed upon at least one of the aforementioned three webs.
Abstract:
A tire of vulcanized elastomer having at least two carcass plies having reinforcing cords embedded therein with the cords in each ply extending continuously at a bias angle from one bead to the opposite bead of the tire. An overhead ply having metal reinforcing wires therein is provided over the carcass ply, with the wires in the overhead ply spliced in the crown region of the tire and extending at equal but opposite bias angles on axially opposite sides of the tire through the sidewalls and terminating adjacent the beads.
Abstract:
A pneumatic tire comprising a carcass, a breaker assembly, and a reinforcement layer disposed in each shoulder region of the tire in directly overlapping relationship with said carcass and an edge of the breaker assembly such as to reduce the possibility of separation of the layers of the breaker assembly of which the following is a specification.
Abstract:
The endless reinforcement for a pneumatic tire of the present invention comprises continuous cord forming a generally zigzag pattern and being positioned across the width of the reinforcement from one side to the other at an angle to the edges of the reinforcement with reversals at the edges. Lengths of the cord between the reversals are interleaved with lengths disposed in an opposite direction along at least one line substantially parallel and intermediate the edges thereof. Also, a method for producing a tire including such reinforcement and the resulting tire.