The present invention is directed to a rubber ply for a tire, the rubber ply comprising pairs of textile cords arranged in parallel in a plane, wherein each cord of the pairs of textile cords comprises two cord plies. The distance between two adjacent pairs of textile cords (d.sub.p) is at least 5 times larger than the distance between two parallel textile cords (d.sub.i) within a pair of textile cords, and wherein the two cord plies in one or more of the textile cords are twisted together in a range from 8 TPI to 12 TPI and have each a density ranging from 500 dtex to 2000 dtex. The present invention is also directed to a tire comprising such a rubber ply which is particularly applicable and beneficial for utilization in motorcycle tires.

Motorcycles tyre including a carcass structure, a zero-degree belt structure arranged in a radially outer position with respect to the carcass structure and a tread band arranged in a radially outer position with respect to the belt structure. The belt structure includes at least one hybrid reinforcing cord that has an elongation greater than 4% when subjected to a load equal to about 50 N and a tangent modulus with a monotonic progression as the elongation increases for elongations comprised between 4% and at least 9%.

The invention relates to a tyre comprising a working reinforcement comprising a single working ply, a carcass reinforcement and a hoop reinforcement. The hooping reinforcing textile filamentary element or elements (480), the working reinforcing filamentary elements (460) and the carcass reinforcing filamentary elements (440) are arranged so as to form a triangular mesh in projection on the circumferential equatorial plane (E). The or each hooping reinforcing textile filamentary element (480) is formed by a cord (30) with a triple twist (T1, T2, T3), comprising an assembly (25) consisting of N>1 strands (20a, 20b, 20c) twisted together with a twist T3 in a direction D2, each strand consisting of M>1 pre-strands, which are themselves twisted together with a twist T2 (T2a, T2b, T2c) in a direction D1 opposite to D2, each pre-strand itself consisting in a yarn that has been previously twisted about itself with a twist T1 in the direction D1, wherein at least half of the N times M yarns consist of elementary monofilaments of aromatic polyamide or aromatic copolyamide.

The present invention concerns a radial tire (1) for a heavy civil-engineering vehicle, and aims to increase the resistance to repeated impact of its crown reinforcement (3), when driving over stones, while maintaining good resistance to attacks. The tire (1) comprises a protective reinforcement (5) comprising at least one protective layer (51, 52) comprising elastic metal reinforcers, and a working reinforcement (6) comprising two working layers (61, 62) comprising non-extensible metal reinforcers, the elastic metal reinforcers of the radially innermost protective layer (51) have a elastic modulus in extension of at least 100 GPa and a diameter D of at least 3 mm, and are distributed axially at an axial pitch P at least 1.2 times the diameter D.

A pneumatic tire having a carcass and a belt reinforcing structure wherein the belt reinforcing structure is a composite belt structure having at least one radially inner spiral layer and at least one zigzag belt reinforcing structure located radially outward of said spiral layer. The zigzag belt width is preferably wider than the spiral layer. The spiral layer and at least one of the zigzag belts reinforcing structures is preferably formed of a merged cord of aramid and nylon.

A method for manufacturing a bonded reinforcing textile filamentary element (48) comprising a core and a layer of strands is disclosed. The textile filamentary element in the natural state is assembled. A textile filamentary element in the natural state or pre-bonded textile filamentary element is obtained. The filamentary element in the natural state or pre-bonded filamentary element is coated with an external layer of at least one heat-crosslinkable adhesive composition. The filamentary element in the natural state or pre-bonded filamentary element that is coated with the external layer is thermally treated so as to crosslink the adhesive composition in order to obtain the bonded filamentary element (48). The steps of coating with and of thermally treating the external layer of the filamentary element in the natural state or pre-bonded filamentary element are carried out such that, for an elongation equal to 30% of the elongation at break of the filamentary element in the natural state, the tangent modulus of the bonded reinforcing textile filamentary element (48) is increased compared with the tangent modulus of the filamentary element in the natural state.

A two-layer multi-strand cord (60) comprises an internal layer (CI) of the cord made up of J>1 internal strands (TI) and an external layer (CE) of the cord made up of L>1 external strands (TE). The cord satisfies the relationship 95MC175, where MC=(JMI+LME)/(J+L); MI=200cos.sup.4()[Q(D1/2).sup.2cos.sup.4()+N(D2/2).sup.2cos.sup.4()]/[Q(D1/2).sup.2+N(D2/2).sup.2]; and ME=200cos.sup.4()[Q(D1/2).sup.2cos.sup.4()+P(D2/2).sup.2cos.sup.4(6)+N(D3/2).sup.2cos.sup.4()]/[Q(D1/2).sup.2+P(D2/2).sup.2+N(D3/2).sup.2], where D1, D1, D2, D2, and D3 are in mm, and are the helix angle of each internal and external strand (TI), and are the helix angle of each internal thread (F1, F1), is the helix angle of each intermediate thread (F2) and and are the helix angle of each external thread (F2, F3).

The tire comprises a carcass ply connecting two beads via two sidewalls, the carcass ply being surmounted radially towards the outside of the tire by a crown reinforcing zone which is itself surmounted radially towards the outside of the tire by a tread, the crown reinforcing zone comprising a plurality of reinforcing strips arranged over at least one ply of strips. The strips are arranged so that they are juxtaposed and at an angle less than or equal to 15 with respect to the circumferential direction. Each reinforcing strip is made up of a laminate of at least 3 composite layers, each composite layer containing oriented fibers having a tensile modulus greater than or equal to 55 GPa, which are parallel to one another and coated in a polymer matrix.

A ply (16, 18) comprises metallic monofilaments (46, 46). Each monofilament (46) of a first group has a positive torsional elastic deformation in a first direction about its main axis (G). Each monofilament (46) of a second group has a negative torsional elastic deformation in a second direction about its main axis (G). The absolute value of the torsional elastic deformation C of each monofilament (46, 46) is such that |C|6 turns per ten metres. The mean S of the torsional elastic deformations of the monofilaments (46, 46) of the ply (16, 18) is such that 0.25 turn per ten metresS+0.25 turn per ten metres. The monofilaments (46, 46) are arranged next to one another so as to alternate one or more monofilaments (46) of the first group with one or more monofilaments (46) of the second group.

A radial tire for a heavy vehicle of construction plant type, and aims to increase the resistance of the crown thereof to attack The tire (1) for a heavy vehicle of construction plant type has a crown reinforcement (3) radially on the inside of a tread (2) and radially on the outside of a carcass reinforcement (4), the crown reinforcement (3) has, radially from the outside to the inside, a protective reinforcement (5) and a working reinforcement (6). The protective reinforcement (5) has at least one protective layer (51, 52) comprising elastic metal reinforcers that have a breaking strength Fm and a section of diameter D and are spaced apart in pairs by a spacing P at least equal to the diameter D. According to the invention, the ratio A=(PD)/D is at least equal to 0.25 and at most equal to 1, the ratio B=(Fm/P)/1000 is at least equal to 1.1 and at most equal to 2, Fm being expressed in N and P being expressed in mm, and the elastic metal reinforcers of the protective layer (51, 52) are multistrand ropes of structure 1N comprising a single layer of N strands wound in a helix.