Tyre for vehicle wheels

Abstract

A tyre for a vehicle wheel, the tyre comprising a structural part comprising a plurality of hybrid reinforcing cords (10) made by twisting together two yarns (20a, 20b), each yarn comprising a plurality of filaments (22a, 22b). A single yarn (20a) of the two yarns (20a, 20b) further comprises a single monofilament fabric thread (21a) which is at least partially embedded in the filaments (22a) of the yarn (20a) in any cross section of the yarn (20a).

Description

Technical Field

[0001] The invention relates to a tyre for vehicle wheels.

[0002] The invention also relates to a hybrid reinforcing cord to be used in a tyre for vehicle wheels.

[0003] Preferably, the tyre of the invention is a tyre for sports vehicle wheels, in particular high performance and very high performance vehicles.

[0004] Tires for high performance and ultra high performance vehicles, usually defined as "HP" tires or "UHP" tires, in particular those allowing speeds of over 190 km / h and up to over 300 km / h. Examples of such tires are tires with speed codes "T", "U", "H", "V", "Z", "W", "Y" according to the ETRTO (European Tire and Rim Technical Organization) standard, and racing tires, in particular tires for high-powered four-wheeled vehicles. Typically, tires with the above speed codes have a cross-sectional width equal to or greater than 185 mm, preferably between 195 mm and 385 mm, more preferably between 195 mm and 355 mm. Such tires are preferably mounted on rims with a mounting diameter equal to or greater than 13 inches, preferably not greater than 24 inches, more preferably between 16 inches and 23 inches.

[0005] However, the tyre of the invention can be used for vehicles other than the above-mentioned cars, for example for sports motorcycles intended to provide high performance in terms of power, comfort and mileage, like for example motorcycles of the "sports touring" type, i.e. motorcycles designed for different types of terrain and different road conditions.

[0006] Typically, a sports touring motorcycle is one with a large piston displacement (e.g. 800 cm 3 or more) and / or high-power (e.g. 100-120 horsepower or more) motorcycles.

[0007] The tyre of the invention comprises hybrid reinforcing cords as defined in the remainder of this description. Background Art

[0008] US 7222481 B2, EP 3196343 A1, US 4343343 A1, EP 329590 A1 describe tires with reinforcing cords comprising a core made of a textile material and textile filaments wound around the core.

[0009] WO 2020 / 128943 A2 of the applicant describes a reinforcing cord comprising two yarns twisted with each other at a predetermined twist pitch. Each of the two yarns comprises a monofilament textile thread embedded in a yarn filament. Summary of the invention

[0010] Throughout this specification and in the claims that follow, when referring to certain angular values, these are to be regarded as absolute values, ie both positive and negative values ​​relative to a reference plane or reference direction, unless otherwise indicated.

[0011] In addition, when referring to any range of values ​​including a minimum value and a maximum value, the above minimum value and maximum value are deemed to be included in the above range unless otherwise specified.

[0012] Furthermore, all ranges include any combination of the stated minimum and maximum values ​​and include any intermediate ranges, even if not expressly stated.

[0013] Even if not expressly stated, any numerical value is deemed to be preceded by the term "about" to also represent any numerical value that differs slightly from the stated value, for example taking into account dimensional tolerances typical of the art concerned.

[0014] Hereinafter, the following definitions apply.

[0015] The term "motorcycle tire" is used to denote a tire having a high curvature ratio (generally greater than 0.20) and capable of achieving high camber angles during cornering.

[0016] The term “curvature ratio” is used to indicate the ratio of the distance between the radial highest point of the tread band of the tire and the maximum width of the radial section of the tire (also called “maximum chord length”), in a section of the tire, to the same maximum width of the tire.

[0017] The term "maximum width in radial section", or "maximum chord length", is used to denote the maximum width of the tire profile, ie the dimension of the segment ending in the two axially outermost points of the tread band profile.

[0018] The term “equatorial plane” of the tyre is used to denote the plane perpendicular to the axis of rotation of the tyre and which divides the tyre into two symmetrically equal parts.

[0019] The terms "radial" and "axial" and the expressions "radially inward / outward" and "axially inward / outward" are used to refer to a direction substantially parallel to the equatorial plane of the tire and a direction substantially perpendicular to the equatorial plane of the tire, respectively, that is, a direction substantially perpendicular to the axis of rotation of the tire and a direction substantially parallel to the axis of rotation of the tire, respectively.

[0020] The terms "circumferential" and "circumferentially" are used to refer to the direction of annular extension of the tyre, ie the rolling direction of the tyre, which direction corresponds to a direction lying in a plane coinciding with or substantially parallel to the equatorial plane of the tyre.

[0021] The term "substantially axial direction" is intended to indicate a direction inclined by an angle between 70° and 90° with respect to the equatorial plane of the tyre.

[0022] The term "substantially circumferential direction" is used to denote a direction oriented at an angle between 0° and 10° with respect to the equatorial plane of the tyre.

[0023] The term "elastomeric material" or "elastomer" is used to denote a material comprising a vulcanizable natural or synthetic polymer and a reinforcing filler, wherein the material, after having been subjected to vulcanization, can be deformed by a force at room temperature and is capable of rapidly and positively recovering substantially its original shape and size after the deforming force is removed (as defined in Standard Terminology for Rubber ASTM D1566-11).

[0024] The term "reinforcing cord" or simply "cord" is used to denote an elongated element consisting of one or more elongated elements (also called "threads" or "yarns") possibly coated with or incorporated in a matrix of elastomeric material.

[0025] In the following, the term "thread" will be used to refer to a single elongated element consisting of a single textile filament (in this case, "monofilament textile thread" will also be used), while the term "yarn" will be used to refer to an elongated element made by gathering multiple textile filaments (in this case, "multifilament textile yarn" will also be used).

[0026] Each filament may also be referred to as a "fiber".

[0027] The yarn may have one or more "ends", where the term "end" is used to denote a bundle of filaments twisted together. For example, a single end or at least two ends twisted together may be foreseen.

[0028] Yarns can be identified with symbols indicating the fabric material, the linear density of the fibers used, and the number of ends that form the yarn. For example, a yarn with ends made of PET (polyethylene terephthalate) is identified with PET 1672, indicating that the yarn includes fibers made of PET, has a linear density of 1670 dtex, and is formed by two ends twisted together.

[0029] Two yarns are considered to be "twisted" to or with each other when each of the two yarns is wound around the other yarn, i.e. when each of the two yarns extends around the other yarn along a non-rectilinear path, in particular along a helical path or a spiral path. This definition does not include the case where one of the two yarns (the first yarn) is wound around the other yarn (the second yarn) but not vice versa. In this case, the reinforcing cord is not obtained by twisting two yarns together, but by winding the first yarn around the second yarn. In such a reinforcing cord, the first yarn extends around the second yarn along a non-rectilinear path, in particular a helical path or a spiral path, while the second yarn always extends along a substantially rectilinear path in a radially internal position relative to the first yarn.

[0030] In a yarn, a monofilament textile strand is considered to be "bound" in the filaments of the yarn when the monofilament textile strand is arranged or embedded between the filaments of the yarn. This definition does not include the case where the monofilament textile strand defines a central core about which the filaments of the yarn are helically wound or spirally wound.

[0031] The expression "hybrid reinforcing cord" is used to denote a textile reinforcing cord comprising two different yarns twisted together.

[0032] In the case of a yarn, the "diameter" of the yarn is the diameter of a perfect circle circumscribing all of the filaments defining the yarn.

[0033] The term "linear density" or "count" of a cord or thread / yarn is used to indicate the weight of the cord or thread / yarn per unit length. The linear density can be measured in dtex (grams per 10 km length).

[0034] In this specification, two materials are also considered different when one material is a recycled material and the other material is a corresponding non-recycled material. Thus, for example, recycled PET is a different material from non-recycled PET.

[0035] The term "recycled material" is used to denote plastic material obtained from garbage or industrial waste, which is manufactured from corresponding materials of a plastic source (usually, although not necessarily, of fossil origin) and has undergone appropriate mechanical and / or chemical and / or thermal treatments so as to be able to subsequently give rise to a reusable product.

[0036] The term “non-recycled materials” is used to refer to plastics that are of fossil origin.

[0037] The term "biobased materials" is used to denote materials that are not derived from fossils, that are not obtained from garbage or industrial waste, but rather from renewable sources, like for example agricultural and forest products, which are cultivated and / or used by humans for purposes other than human or animal nutrition.

[0038] In the following, when referring to the percentage of a product made from recycled or bio-based materials, it is the weight of such product relative to the weight of the yarn with which such product is combined. Thus, for example, a 65% recycled or bio-based yarn means that 65% of the total weight of the yarn is produced from recycled or bio-based materials, and the remaining 35% of the total weight of the yarn is produced from fossil-derived materials.

[0039] The terms "left-hand" and "right-hand" are used to indicate the twisting direction of the reinforcing cords or yarns when the reinforcing cords are oriented vertically and the inclination of the individual turns and / or the portions of the cords / threads / yarns / ends connecting the individual turns of the spiral defined by the cords / threads / yarns / ends is observed. When the turns and / or portions are inclined in an S-shape, the twisting direction is left-handed, and when the turns and / or portions are inclined in a Z-shape, the twisting direction is right-handed. Therefore, the left-handed twisting direction is also indicated by S for simplicity, and the right-handed twisting direction is indicated by Z for simplicity.

[0040] The term "twist count" is used to denote the number of twists applied to a cord / yarn / thread per unit length of the cord / yarn / thread. The twist count is indicated in TPI (twists per inch), thereby indicating the number of twists of one inch of the cord / yarn / thread. In the case where the wires and / or yarns must be twisted, the twisting is performed before making the cord.

[0041] The term "breaking load" of a cord / yarn / thread is used to denote the load at which the cord / yarn / thread breaks, evaluated according to the BISFA (International Bureau of Standardization of Man-Made Fibres) standard for materials tested according to the definitions given below.

[0042] For the purposes of the present invention, for the determination of the linear density and for the determination of the tensile properties (such as breaking load), reference is made to flat wires, without twisting being applied during the testing phase, according to the tests prescribed by the BISFA standard. In particular:

[0043] - For polyester (PET), refer to BISFA-Polyester Yarn Test Method-2004 Edition:

[0044] Determination of Linear Density - Chapter 6 - Procedure A;

[0045] Determination of tensile properties - Chapter 7 - Procedure A;

[0046] Preparation of laboratory samples: Preparation of samples under relaxation - paragraph 7.4.1.1 => Preparation of samples on foldable reels;

[0047] Preparation of laboratory samples and performance of tests: manual testing - paragraph 7.5.2.1 => c);

[0048] Start the program => e) pre-stretch at the beginning of the program;

[0049] • Stretching was performed using a Zwick-Roell Z010 dynamometer.

[0050] - For nylon (NY), refer to BISFA-Test Methods for Polyamide Yarns-2004 Edition:

[0051] Determination of Linear Density - Chapter 6 - Procedure A;

[0052] Determination of tensile properties - Chapter 7 - Procedure A;

[0053] Preparation of laboratory samples: Preparation of samples under relaxation - paragraph 7.4.1.1 => Preparation of samples on foldable reels;

[0054] Preparation of laboratory samples and performance of tests: manual testing - paragraph 7.5.2.1 => c);

[0055] Start the program => e) pre-stretch at the beginning of the program;

[0056] • Stretching was performed using a Zwick-Roell Z010 dynamometer.

[0057] The term "radial carcass structure" is used to denote a carcass structure comprising a plurality of reinforcing cords, each of which is oriented in a substantially axial direction in the crown portion of the tire. Such reinforcing cords may be incorporated in a single carcass ply or in multiple (preferably two) carcass plies radially juxtaposed to one another.

[0058] The term "cross-belt structure" is used to denote a belt structure comprising a first belt layer comprising reinforcing cords substantially parallel to one another and inclined at a predetermined angle relative to the equatorial plane of the tire, and at least one second belt layer, the first belt layer being arranged in a radially outer position relative to the first belt layer and having reinforcing cords substantially parallel to one another but oriented with respect to the equatorial plane of the tire to have an inclination opposite to that of the cords of the first belt layer.

[0059] The term "zero-degree reinforcement layer" is used to denote a reinforcement layer comprising at least one reinforcement cord wound according to a substantially circumferential winding direction on the belt structure (in the case of automobile tires) or on the carcass structure (in the case of motorcycle tires). In motorcycle tires, the zero-degree reinforcement layer may itself define the "belt structure" of such tire, or may be replaced by two juxtaposed reinforcement layers defining a cross-belt structure.

[0060] The term "structural component" of the tire is used to denote any ply or layer of the tire containing reinforcing cords, such as, for example, the carcass ply of an automobile tire or a motorcycle tire, or the belt ply of an automobile tire, or the zero-degree reinforcement ply (or cross-belt structure) of a motorcycle tire, or the reinforcement ply connected to the carcass ply of an automobile tire at or near the corresponding folded-over end edges of the carcass ply, the reinforcement plies being hereinafter referred to as "core fabric" and "chafer".

[0061] The term "cord count" of a structural component of a tire is used to denote the number of reinforcing cords per unit length provided in such a component. The cord count can be measured in cords / dm (number of cords per decimeter).

[0062] In the following, when discussing the adhesion capacity of the textile reinforcing cords and more generally of the elongated elements to the elastomeric material, it is considered to refer to the adhesion capacity of the textile reinforcing cords solely due to their shape or structure, therefore not taking into account surface coating treatments by means of adhesive compositions. It is in fact well known in the field of tire production to use adhesive compositions, such as resorcinol-formaldehyde-latex (RFL) compositions, to promote adhesion between the elongated elements and the elastomeric material and thus to ensure the performance of the tire during use. Such RFL-based adhesive compositions are applied to the polymeric elongated elements, generally by immersion in an RFL-based aqueous solution, i.e. an emulsion of rubber latex in an aqueous solution of resorcinol and formaldehyde (or a precondensed resin obtained from the reaction between resorcinol and formaldehyde). Some materials, such as rayon and aliphatic polyamides, have already obtained the best properties for adhesion to elastomeric materials by a single immersion in an RFL-based bath (dipping, one-step process), while other materials, such as polyesters or aromatic polyamides, have greater difficulty adhering to elastomeric materials and therefore make use of special physical or chemical activation pretreatments. For example, elongated elements made of polyester or aramid are surface preactivated by pretreatment with a first activation bath (preimpregnation, two-step process) or by pretreatment with ionizing radiation, with plasma or with solvents.

[0063] Tires for sports cars and motorcycles require high adhesion to the ground so that they can effectively unload the high driving torque they receive to the ground and thus obtain high thrust and effective braking force. Such tires must also be light and respond adequately to the stresses they receive during straight-line driving and cornering.

[0064] A tire for a sports vehicle generally comprises a radial carcass structure, a cross belt structure arranged radially outer relative to the carcass structure, a zero degree reinforcing layer arranged radially outer relative to the cross belt structure, and a tread band arranged radially outer relative to the zero degree reinforcing layer.

[0065] In tires for sports motorcycles, the belt structures may be crossed, or may not be crossed. In the second case, the belt structures define a zero-degree reinforcement layer.

[0066] The carcass structure is intended to provide the desired integrity and structural strength characteristics to the tire, while the cross-belt structure, in addition to helping to provide the above-mentioned integrity and structural strength characteristics, is also intended to transfer to the carcass structure the lateral and longitudinal stresses to which the tire is subjected once it comes into contact with the road during driving, so as to provide the desired performance characteristics to the tire (i.e., grip performance, driving stability, controllability, directionality, grip). On the other hand, the zero-degree reinforcement layer is intended to limit the radial deformation of the belt structure (in a car tire) or the radial deformation of the carcass structure (in a motorcycle tire).

[0067] In order to obtain the above-mentioned structural and performance characteristics, one or more reinforcement layers are provided in the carcass structure and belt structure of automobile tires and in the carcass structure of motorcycle tires (in the carcass structure, the reinforcement layer corresponds to one or more "carcass ply layers"), each reinforcement layer including a plurality of reinforcement cords appropriately inclined relative to the circumferential direction or the rolling direction, and reinforcement cords oriented substantially parallel to the circumferential direction or the rolling direction are provided in the zero-degree reinforcement layer.

[0068] At least some of the above-mentioned reinforcement cords are textile reinforcement cords.

[0069] In order to make a textile reinforcing cord having mechanical characteristics suitable for use in the carcass structure of an automobile tire or a motorcycle tire and in the belt structure of an automobile tire, the applicant has considered twisting two yarns together, each yarn comprising a plurality of filaments and a monofilament textile thread embedded in the filaments, as described in WO 2020 / 128943 A2.

[0070] In fact, the Applicant has noticed that, thanks to the presence of at least two monofilament textile threads, this type of reinforcing cord has a high rigidity, especially when the diameter of the monofilament textile threads is greater than 0.22 mm. This high rigidity not only makes it possible to obtain a high impact resistance, but also foresees a lower thread count than is usually provided in the case of using conventional textile reinforcing cords comprising only multifilament textile yarns, thus reducing the weight of the tire.

[0071] However, the Applicant has discovered that a high stiffness is detrimental to the performance of the reinforcing cord under fatigue and therefore to the duration or useful life of the reinforcing cord.

[0072] The Applicant has found that by twisting together at least one multifilament textile yarn with a yarn comprising both a plurality of filaments and a monofilament textile thread, a hybrid reinforcing cord can be made which offers an excellent compromise between stiffness and fatigue resistance and which is particularly suitable for use in the carcass structure of automobile and motorcycle tires.

[0073] In fact, the reinforcing cords of the carcass structure are mainly subjected to stress bending and must therefore remain sufficiently flexible so as not to jeopardize performance under fatigue. Therefore, the reinforcing cords need not be excessively stiff. The required rigidity can be obtained by appropriately choosing the diameter of the monofilament textile threads.

[0074] Since filaments are better suited to adhere to the surrounding elastomeric material than monofilament textile threads, the Applicant has also considered embedding monofilament textile threads in the filaments of the corresponding yarn.

[0075] Thus, in its first aspect, the present invention relates to a tyre for vehicle wheels.

[0076] Preferably, the tyre comprises at least one structural component comprising a plurality of hybrid reinforcing cords.

[0077] Preferably, at least some of said hybrid reinforcing cords comprise at least two yarns twisted together.

[0078] Preferably, each of the at least two yarns comprises a plurality of filaments.

[0079] Preferably, a single yarn of the at least two yarns further comprises a single monofilament textile thread.

[0080] Preferably, in any cross section of the individual yarns, the monofilament textile threads are at least partially embedded in the filaments of the individual yarns.

[0081] In its second aspect, the present invention relates to a hybrid reinforcement cord.

[0082] Preferably, said hybrid reinforcing cord comprises at least two yarns twisted together.

[0083] Preferably, each of the at least two yarns comprises a plurality of filaments.

[0084] Preferably, a single yarn of the at least two yarns further comprises a single monofilament textile thread.

[0085] Preferably, in any cross section of the individual yarns, the monofilament textile threads are at least partially embedded in the filaments of the individual yarns.

[0086] The Applicant believes that hybrid reinforcing cords of the type described above could be used in the carcass structure of a car or motorcycle tire, replacing the textile reinforcing cords currently used.

[0087] The Applicant also considers that the above-described hybrid reinforcing cords are suitable for use also or only in other structural components of tires, such as for example the structural components of automobile tires denoted "flippers" and "chafers" described below.

[0088] In at least one of the above aspects, the present invention may have at least one of the following preferred features.

[0089] Preferably, in any cross section of said individual yarns, said monofilament textile threads are fully embedded in the filaments of the yarn so as to maximize the adhesion of the hybrid reinforcing cord to the surrounding elastomeric material.

[0090] In some preferred embodiments, the diameter of the monofilament textile thread is less than or equal to 0.22 mm, more preferably less than or equal to 0.21 mm, even more preferably less than or equal to 0.20 mm.

[0091] Such reinforcing cords are preferably used in the carcass structure of motorcycle tires.

[0092] In other embodiments, the diameter of the monofilament textile thread is greater than or equal to 0.22 mm, preferably greater than or equal to 0.25 mm, and more preferably greater than or equal to 0.30 mm.

[0093] Such reinforcing cords are preferably used in the carcass structure of automobile tires and / or in the flippers and chafers. In this case, the reinforcing cords can be provided not only with sufficient rigidity according to the stresses they are intended to withstand, but also with a lower thread count than is usually provided in the case of using conventional textile reinforcing cords comprising only multifilament textile yarns, thereby reducing weight.

[0094] Preferably, the monofilament textile thread is made of at least partly recycled or bio-based materials in order to meet the increasing demand for using materials of non-fossil origin instead of conventional fossil origin materials, thereby protecting the environment.

[0095] Preferably, the filaments of the individual yarns are made from at least partially recycled or bio-based materials.

[0096] Preferably, the filaments of at least one second yarn of the at least two yarns are made from an at least partially recycled or bio-based material.

[0097] The hybrid reinforcing cord can be made entirely of recycled materials, or entirely of bio-based materials, or partially of recycled materials, partially of bio-based materials, or partially of recycled materials, partially of fossil-derived materials, or partially of bio-based materials, partially of fossil-derived materials, or using recycled materials, bio-based materials, and fossil-derived materials. In all of these cases, providing filaments and / or monofilament fabric threads made of recycled and / or bio-based materials in the hybrid reinforcing cord can enable it to achieve the desired benefits in terms of environmental sustainability. The greater the percentage of recycled or bio-based materials used, the greater the benefit.

[0098] The choice of materials for the monofilament threads and filaments of the individual yarns may be determined based on market availability and / or relative cost at the time of selection.

[0099] Preferably, the monofilament textile thread is made of at least partially recycled or bio-based PET or nylon.

[0100] Preferably, the filaments of the individual yarns are made from at least partially recycled or bio-based PET or nylon.

[0101] More preferably, the material of the above-mentioned filaments is the same as that of the monofilament textile thread.

[0102] Preferably, the filaments of the at least one second yarn are made from at least partially recycled or bio-based PET or nylon.

[0103] The applicant has ascertained that monofilament textile threads and yarns made from the above-mentioned materials are commercially available.

[0104] Preferably, the material of all the filaments of the hybrid reinforcing cords is the same as the material of the monofilament textile threads.

[0105] Preferably, said hybrid reinforcing cord consists of said single yarn and a single second yarn.

[0106] Preferably, said at least one structural component is a carcass ply.

[0107] In some embodiments of the vehicle tyre, the at least one structural component is a reinforcing layer associated with the carcass ply, such as for example a flipper and / or a chafer, at or near a respective turned-up end edge of the carcass ply.

[0108] In other embodiments, the hybrid reinforcing cords of the present invention are used in both the carcass ply and the above-mentioned reinforcing layers.

[0109] Preferably, said single yarn is twisted on itself with a predetermined first twist length.The Applicant has found that such an arrangement helps to optimize the performance under fatigue of the reinforcing cord.

[0110] Preferably, said first twist length is equal to the twist length of said at least two yarns.

[0111] Preferably, the at least one second yarn is twisted upon itself at a second twist length.

[0112] Preferably, said second twist length is equal to the twist length of said at least two yarns.

[0113] In some embodiments, the monofilament textile line is twisted with itself at a corresponding twist length, which is preferably equal to the twist length of the yarn. In this way, the embedding of the monofilament textile line in the filaments of the yarn is maximized to facilitate the attachment of the reinforcing cord to the surrounding elastomeric material.

[0114] In some embodiments, in the at least one second yarn, the at least one second monofilament textile thread is twisted with itself at a corresponding twist length, which is preferably equal to the twist length of the yarn.

[0115] Preferably, the hybrid reinforcing cord is twisted on itself with a corresponding twist length which may be equal to or different from the twist length of the yarns and / or of the monofilament fabric threads. BRIEF DESCRIPTION OF THE DRAWINGS

[0116] Other features and advantages of the tire of the present invention will become more apparent from the following detailed description of preferred embodiments with reference to the accompanying drawings, in which:

[0117] - Figure 1 is a partial half-section schematic diagram of a portion of a vehicle tire according to an embodiment of the present invention;

[0118] - Figure 2 A radial cross-sectional view showing a motorcycle tire according to an embodiment of the present invention;

[0119] - Figure 3 is a schematic side view of a section of an example of a hybrid reinforcing cord according to the present invention, which is used for Figure 1 and 2 Tires shown;

[0120] - Figure 4 yes Figure 3 An enlarged schematic diagram of a cross section of an embodiment of a hybrid reinforcing cord is shown, such a cross section being taken from Figure 3 Section SS shown in . DETAILED DESCRIPTION

[0121] Figure 1 Only a part of an exemplary embodiment of a tyre 100 for an automobile or a four-wheeled vehicle according to the invention is shown, the remaining parts not shown being substantially identical and arranged symmetrically with respect to the equatorial plane MM of the tyre.

[0122] Preferably, the tire 100 is a HP or UHP tire for sports vehicles and / or high performance and ultra high performance cars.

[0123] In particular, according to the ETRTO standard, the tire 100 carries one of the following speed codes: "T", "U", "H", "V", "Z", "W", "Y".

[0124] Figure 1 , “a” denotes an axial direction, “c” denotes a radial direction, “MM” denotes an equatorial plane of the tire 100 , and “RR” denotes an axis of rotation of the tire 100 .

[0125] The tyre 100 comprises a carcass structure 101 of radial type, said carcass structure in turn comprising at least one carcass ply 111 .

[0126] In the following, for the sake of simplicity, only embodiments of the tire 100 comprising a single carcass ply 111 (single-ply tire) are described. However, it is understood that the description regarding the carcass ply 111 also applies to each carcass ply of a tire comprising more than one carcass ply, unless otherwise stated. In fact, embodiments of the tire 100 of the present invention are foreseen in which the carcass structure 101 comprises, for example, two carcass plies 111 (double-ply tire).

[0127] The carcass ply 111 includes a plurality of reinforcing cords 10' coated with a cross-linked elastomeric material layer or incorporated in a cross-linked elastomeric material layer. In the case where the tire 100 is a two-ply tire, the reinforcing cords of the first carcass ply may be substantially parallel to the reinforcing cords of the other carcass ply, or inclined at an angle of less than 40° relative to the reinforcing cords of the other carcass ply.

[0128] Preferably, the number of cords of the carcass ply 111 is greater than or equal to 70 cords / dm, and less than or equal to 95 cords / dm, more preferably, between 75 cords / dm and 90 cords / dm. For example, in a preferred embodiment of the tire 100 of the present invention, the number of cords is equal to 85 cords / dm.

[0129] Preferably, the thickness of the carcass ply 111 is between 0.7 mm and 1.5 mm, more preferably between 0.9 mm and 1.3 mm. For example, in the above preferred embodiment of the tire 100 of the present invention, the above thickness is equal to 1.1 mm.

[0130] The carcass ply 111 has axially opposite end edges engaged with respective annular anchoring structures 102, called bead cores, which may be associated with elastomeric fillers 104. The region of the tyre 100 comprising the bead cores 102 and the possible elastomeric fillers 104 forms an annular reinforcing structure 103, called “bead structure” and intended to allow the tyre 100 to be anchored on a respective mounting rim, not shown.

[0131] Each annular reinforcing structure 103 is associated with the carcass structure 101 by folding back (or turning up) the opposite end edges of at least one carcass ply 111 around a bead core 102 and a possible elastomeric filler 104 so as to form a so-called turn-up 101a of the carcass structure 101 .

[0132] In an embodiment, by applying the layer ( Figure 1 (not shown), a connection may be made between the carcass structure 101 and the annular reinforcement structure 103.

[0133] The anti-wear strips 105 are arranged at each annular reinforcement structure 103 so as to be wound around the annular reinforcement structure 103 along the axially inner, axially outer and radially inner regions of the annular reinforcement structure 103, so as to be arranged between the annular reinforcement structure and the wheel rim when the tire 100 is mounted on the rim. However, such anti-wear strips 105 may not be provided.

[0134] The tyre 100 comprises, in a radially outer position with respect to the carcass structure 101 , a cross-belt structure 106 comprising at least two belt layers 106a, 106b arranged radially juxtaposed to one another.

[0135] The belt layers 106a, 106b respectively comprise a plurality of reinforcing cords 10a, 10b. Such reinforcing cords 10a, 10b are oriented at an angle inclined between 15° and 45°, preferably between 20° and 40°, relative to the circumferential direction of the tire 100 or relative to the equatorial plane MM of the tire 100. For example, such an angle is equal to 30°.

[0136] The tire 100 may also include an additional belt layer (not shown), which is arranged between the carcass structure 101 and the radially innermost belt layer of the above-mentioned belt layers 106a, 106b and includes a plurality of reinforcing cords, the orientation of the reinforcing cords being inclined at an angle equal to 90° relative to the circumferential direction of the tire 100 or the equatorial plane MM of the tire 100.

[0137] The tire 100 may further include an additional belt layer (not shown), which is arranged in a radially outer position relative to the radially outermost belt layer of the above-mentioned belt layers 106a, 106b and includes a plurality of reinforcing cords, the orientation of the reinforcing cords being inclined at an angle between 20° and 70° relative to the circumferential direction of the tire 100 or the equatorial plane MM of the tire 100.

[0138] The reinforcing cords 10a, 10b of the belt layers 106a, 106b are parallel to each other and have a crossed orientation with respect to the reinforcing cords of the other belt layer 106b, 106a.

[0139] In an ultra-high performance tire, the belt structure 106 may be a folded cross-belt structure. Such a belt structure is manufactured by arranging at least one belt layer on a supporting element and folding over the opposite side end edges of the at least one belt layer. Preferably, the first belt layer is first laid on the supporting element, then the supporting element is radially expanded, then the second belt layer is laid on the first belt layer, and finally the opposite axial end edges of the first belt layer are folded over the second belt layer to at least partially cover the second belt layer, which is the radially outermost layer. In some cases, a third belt layer may be arranged on the second belt layer. Advantageously, the folding of the axially opposite end edges of the belt layer on another belt layer arranged in a radially outer position relative to the first belt layer provides the tire with greater reactivity and responsiveness when turning.

[0140] The tire 100 comprises, in a radially external position relative to the cross-belt structure 106, at least one zero-degree reinforcing layer 106c, generally called a "zero-degree belt". It comprises reinforcing cords 10c oriented in a substantially circumferential direction. Such reinforcing cords 10c thus form an angle of a few degrees (generally less than 10°, for example comprised between 0° and 6°) relative to the equatorial plane MM of the tire 100.

[0141] The reinforcing cords 10a, 10b, 10c are coated with an elastomeric material or are incorporated in a matrix of a crosslinked elastomeric material.

[0142] A tread band 109 made of elastomeric material is applied in a radially outer position with respect to the zero-degree reinforcing layer 106c.

[0143] Respective sidewalls 108 made of elastomeric material are also applied on the lateral surface of the carcass structure 101, in an axially external position with respect to the carcass structure 101 itself. Each sidewall 108 extends from one of the lateral edges of the tread band 109 up to the respective annular reinforcing structure 103.

[0144] The wear strips 105 , if provided, extend at least as far as the respective side wall 108 .

[0145] In certain embodiments, such as the one shown and described herein, the rigidity and integrity of the annular reinforcement structure 103 and the sidewall 108 may be improved by providing a reinforcement layer 108, generally referred to as a "flipper" or additional strip insert.

[0146] The flipper 120 is wound around the corresponding bead core 102 and around the elastomeric filler 104 so as to at least partially wrap around the annular reinforcement structure 103. In particular, the flipper 120 is wound around the annular reinforcement structure 103 along its axially inner, axially outer and radially inner regions.

[0147] The flipper 120 is arranged between the turned-up end edge of the carcass ply 111 and the respective annular reinforcing structure 103. Typically, the flipper 120 is in contact with the carcass ply 111 and the annular reinforcing structure 103.

[0148] In some specific embodiments, such as the one shown and described herein, the annular reinforcement structure 103 may also include an additional reinforcement layer 121 , which is generally referred to as a “chafer” or a protective strip and which has the function of increasing the rigidity and integrity of the annular reinforcement structure 103 .

[0149] The chafer 121 is associated with the respective turned-up end edge of the carcass ply 111 in an axially external position with respect to the respective annular reinforcing structure 103 and extends radially towards the sidewall 108 and the tread band 109 .

[0150] The flipper 120 and the chafer 121 include a reinforcing cord 10d ( Figure 1 The reinforcing cords of the flipper 1 are not shown in the drawing, the reinforcing cords being coated with an elastomeric material or being incorporated in a matrix of a cross-linked elastomeric material.

[0151] The tread band 109 has a rolling surface 109a at its radially outer position for contacting the ground. A circumferential groove ( Figure 1 ), the groove is formed by a transverse notch ( Figure 1 ) are connected so as to define multiple blocks of various shapes and sizes on the rolling surface 109a.

[0152] An underlayer 107 is arranged between the cross belt structure 106 and the tread band 109 .

[0153] In some particular embodiments, such as the one shown and described here, it is optional to provide a strip 110 of elastomeric material, generally called “mini-sidewall”, in the connection zone between the sidewall 108 and the tread band 109. The mini-sidewall 110 is generally obtained by co-extrusion with the tread band 109 and allows to improve the mechanical interaction between the tread band 109 and the sidewall 108.

[0154] Preferably, the end portions of the side walls 108 directly cover the side edges of the tread band 109 .

[0155] In the case of a tubeless tire, as shown and described herein, a rubber layer 112 generally referred to as a “liner” is disposed at a radially inner position relative to the carcass ply 111 in order to provide the necessary inflation tightness of the tire 100 .

[0156] At least some of the reinforcing cords 10' (preferably, all the reinforcing cords 10' of the carcass layer 111) and / or at least some of the reinforcing cords 10d of the flipper 120 and / or the chafer 121 are Figure 3 and 4 A hybrid reinforcing cord 10 according to the invention of the type shown and described below.

[0157] On the other hand, the reinforcing cords 10a, 10b and 10c are preferably reinforcing cords of known type, for example comprising only multifilament textile yarns and / or metal wires and / or a combination of multifilament textile yarns and metal wires. The cords 10a and 10b may also be of the type described in WO2020 / 128943 A2.

[0158] Figure 2 An embodiment of a motorcycle tyre according to the invention is shown. Such a tyre is referenced 1. In particular, it is a tyre intended for use on the rear wheel of a sports touring motorcycle.

[0159] The tyre 1 comprises a radial carcass structure 2 having a central crown portion 16 including at least one carcass ply 3, as will be described in detail below.

[0160] The carcass structure 2 is preferably coated on its inner wall with a sealing layer 11 or so-called "liner", substantially consisting of an airtight layer of elastomeric material, suitable for providing an airtight seal to the tyre itself once it is inflated.

[0161] The carcass ply 3 has its axially opposite side edges 3a turned up around respective annular reinforcing structures 4 or bead cores.

[0162] A conical elastomeric filler 5 is applied on the peripheral edge of the bead core 4. The filler 5 occupies the space defined between the carcass ply 3 and the corresponding turned-up side edge 3a of the carcass ply 3.

[0163] In an alternative embodiment not shown, the carcass ply has its opposite side edges associated, without folding, with a specific annular reinforcing structure provided with two metallic annular inserts. In this case, a filler piece made of elastomeric material can be arranged in an axially external position relative to the first annular insert. On the other hand, the second annular insert is arranged in an axially external position relative to the end of the carcass ply. Finally, a further filler piece can be provided in an axially external position relative to the second annular insert and not necessarily in contact with the second annular insert. This further filler piece completes the construction of the annular reinforcing structure.

[0164] The area of ​​the tire including the bead core 4 and the filler 5 forms the so-called "bead". Figure 2In the figure, denoted as a whole by 15, it is intended for anchoring the tyre 1 on a corresponding mounting rim, not shown.

[0165] The belt structure 6 , which will be described in detail later, is arranged in a radially outer position relative to the carcass structure 2 described above.

[0166] A tread band 8 is arranged in a radially outer position with respect to the belt structure 6. By means of the tread band 8 the tyre 1 comes into contact with the ground.

[0167] The tyre 1 may also comprise a pair of sidewalls 2a applied laterally to the carcass structure 2, on axially opposite sides relative to the equatorial plane MM of the tyre. The sidewalls 2a extend from the tread band 8 of the tyre 1 to the beads 15.

[0168] Preferably, the carcass ply 3 is made of an elastomeric material and comprises a plurality of reinforcing cords 10'' arranged parallel to each other and perpendicular to the equatorial plane MM.

[0169] Preferably, the belt structure 6 comprises reinforcing cords 10e arranged substantially parallel and side by side in the axial direction on a crown portion 16 of the carcass structure 2 to form a plurality of turns. Such turns are substantially oriented according to the rolling direction of the tyre 1 (in particular, with an angle between 0° and 5° with respect to the equatorial plane MM), this direction generally referred to as "zero degree" or "circumferential". Preferably, the above-mentioned turns extend over the entire crown portion 16 of the carcass structure 2.

[0170] Preferably, the belt structure 6 comprises a winding of a single reinforcing cord 10e or a winding of a rubber-coated fabric strip comprising reinforcing cords 10e (preferably up to five, arranged side by side), wound in a spiral on the crown portion 16 of the carcass structure 2 from one end of the crown portion 16 to the other.

[0171] Alternatively, the belt structure 6 may comprise at least two radially juxtaposed layers, each consisting of an elastomeric material reinforced with reinforcing cords arranged parallel to one another. The layers are arranged so that the reinforcing cords of a first belt layer are oriented obliquely with respect to the equatorial plane of the tyre, while the reinforcing cords of a second layer are also oriented obliquely, but this orientation is symmetrically crossed with respect to the reinforcing cords of the first layer, forming a so-called "cross belt".

[0172] Preferably, the belt structure 6 comprises a supporting layer 9, which is substantially constituted by a sheet of elastomeric material arranged between the layer of reinforcing cords 10e and the carcass ply 3 and on which the above-mentioned turns are wound. Preferably, the supporting layer 9 extends over a surface whose axial extension substantially corresponds to the surface on which the above-mentioned turns extend. Alternatively, the supporting layer 9 may extend over a surface that is smaller than the extension surface of the turns, for example, extending only on opposite side portions of the belt structure 6.

[0173] In another embodiment not shown, an additional layer of elastomeric material is arranged between the belt structure 6 and the tread band 8. Preferably, such layer extends over a surface corresponding to the extension surface of the belt structure 6. Alternatively, the above-mentioned additional layer may extend over a surface smaller than the extension surface of the belt structure 6, for example extending only on opposite side portions of the belt structure 6.

[0174] The tread band 8 has a tread pattern consisting of a plurality of grooves (some of which are Figure 2 As defined by 17 in the figure, the grooves are formed on the outer surface of the tread band 8 by a molding operation performed simultaneously with the vulcanization of the tire 1.

[0175] At least some of the reinforcing cords 10" (preferably all of the reinforcing cords 10") are Figure 3 and 4 A hybrid reinforcing cord 10 according to the invention of the type shown and described below.

[0176] On the other hand, preferably, the reinforcing cord 10e is a known type of reinforcing cord including only multifilament textile yarns.

[0177] refer to Figure 3 and 4 , the hybrid reinforcing cord 10 includes two yarns 20a, 20b, which are twisted with each other at a predetermined twist pitch P.

[0178] Preferably, the lay length P is between about 1 mm and about 20 mm, more preferably between about 2 mm and about 15 mm, for example equal to about 12.5 mm.

[0179] The two yarns 20a, 20b are different from each other. In particular, the yarn 20a has a single monofilament textile thread 21a embedded in the filament 22a of the multifilament textile yarn 23a, while the yarn 20b includes a plurality of filaments 22b of the multifilament textile yarn 23b and no monofilament textile thread. However, the yarn 20a may include a plurality of multifilament textile yarns. The yarn 20b may also include a plurality of multifilament textile yarns.

[0180] In any cross section of the reinforcing cord 10, the monofilament textile thread 21a is embedded in the filaments 22a of the yarn 20a, that is, the filaments 22a are arranged around the monofilament textile thread 21a so as to completely surround the monofilament textile thread 21a, and therefore, the monofilament textile thread is not visible from the outside because it is completely covered by the filaments 22a of the yarn 20a.

[0181] Although this is a particularly preferred embodiment, Figure 4As shown, in which the monofilament textile thread 21a is completely embedded in the filaments 22a of the yarn 20a in any cross-section of the reinforcing cord 10, other embodiments that are considered equally preferred are embodiments in which the monofilament textile thread 21a is only partially embedded in the filaments 22a of the yarn 20a in any cross-section of the reinforcing cord 10, and in particular in some embodiments, at least 50% of the outer surface of the monofilament textile thread 21a is embedded in the filaments 22a of the yarn 20a.

[0182] The monofilament textile thread 21a extends in the longitudinal direction A, as shown in FIG. Figure 3 shown.

[0183] The mutual arrangement of the monofilament textile thread 21a and the filaments 22a of the yarn 20a in the longitudinal direction A can be such that the monofilament textile thread 21a extends substantially parallel to the filaments 22a, or that the filaments 22a are helically wound around the monofilament textile thread 21a with a predetermined winding pitch, preferably equal to the twist pitch P.

[0184] In this last case, the twist direction of the two yarns 20a, 20b is preferably the same as the pitch of the filaments 22a on the monofilament textile thread 21a, but an opposite direction is foreseeable.

[0185] The yarns 20a, 20b may be twisted about themselves at respective twist lengths that are preferably equal to the twist length P, or may not be twisted about themselves.

[0186] The direction in which the yarns 20a, 20b are twisted themselves may be the same as or opposite to the direction in which the yarns 20a, 20b are twisted with respect to each other.

[0187] The monofilament textile thread 21a may be twisted on itself at a twist pitch preferably equal to the twist pitch P, or may not be twisted on itself.

[0188] The direction in which the monofilament textile thread 21a is twisted itself may be the same as or opposite to the direction in which the two yarns 20a, 20b are twisted with each other.

[0189] The long filaments 22a, 22b of the yarns 20a, 20b are made of recycled or bio-based materials, especially recycled or bio-based PET or nylon. For example, one or more of the following materials can be used: 100% recycled PET, 30% bio-based PET, nylon 4.10 (70% bio-based), nylon 6.10 (100% bio-based), nylon 56 (45% bio-based).

[0190] The monofilament fabric line 21a is made of recycled or bio-based materials, especially recycled or bio-based PET or nylon. For example, one or more of the following materials can be used: 100% recycled PET, nylon 6.10 (60% bio-based), nylon 1010 (up to 99% bio-based).

[0191] No matter what specific type of fabric material is used for long filaments 22a, 22b, such material will be suitable for attachment to the surface, so as to provide the adhesion that is enough to attach to the surrounding elastomeric material.Usually, the attachment process can be carried out by coating adhesive substances or by chemical or physical treatment.

[0192] For example, the attachment treatment is performed by immersing the reinforcing cord 10 in a solution including an adhesive substance after the two yarns 20a, 20b have been twisted together.

[0193] Preferably, the linear density of the yarns 20a, 20b is between about 400 dtex and about 4000 dtex, preferably between about 800 dtex and about 2500 dtex, also depending on the area in which the reinforcing cords 10 are arranged. Figure 1 The structural components of the tire 100 shown or Figure 2 Structural components of the tire 1 are shown.

[0194] When the reinforcing cord 10 is used Figure 1 In the case of the tire 100 of the carcass structure 101 and / or the bead flipper 120 and / or the bead flipper 121, the diameter of the monofilament textile line 21a is greater than 0.22 mm, preferably greater than or equal to 0.25 mm, more preferably greater than or equal to 0.30 mm, for example equal to 0.30 mm or 0.40 mm, and when the reinforcing cord 10 is used Figure 2 When the carcass structure 3 of the tyre 1 is shown, its diameter is less than or equal to 0.22 mm, preferably less than or equal to 0.21 mm, even more preferably less than or equal to 0.20 mm.

[0195] exist Figure 1 In the particular embodiment of the tire 100 shown, only the reinforcing cords 10 ′ and none of the reinforcing cords 10 d (or vice versa) are hybrid reinforcing cords 10 of the type described above.

[0196] When the reinforcing cord 10d is a hybrid reinforcing cord 10 of the above-mentioned type, such a hybrid reinforcing cord 10 may be used only for the core packing 120 (if the core packing 120 is provided and when the core packing 121 is not provided or is provided but includes a conventional reinforcing cord), may be used only for the core packing 121 (if the core packing 121 is provided and when the core packing 120 is not provided or is provided but includes a conventional reinforcing cord), or may be used for both the core packing 120 and the core packing 121 (if both are provided).

[0197] Some preferred embodiments of the hybrid reinforcing cord 10 according to the present invention that can be used in a carcass structure of a vehicle tire are described in the following "Comparative Tests" paragraph.

[0198] A preferred embodiment of the hybrid reinforcing cord 10 according to the present invention that can be used in a motorcycle tire carcass structure includes two yarns 20a and 20b twisted together, wherein the yarn 20a includes a plurality of filaments 22a made of 100% recycled PET with a linear density equal to 3340 dtex and a monofilament fabric line 21a made of 100% recycled PET with a diameter equal to 0.197 mm, and the yarn 20b includes a plurality of filaments 22b made of 100% recycled PET with a linear density equal to 3340 dtex.

[0199] Comparative test

[0200] The Applicant has carried out comparative tests with the hybrid reinforcing cord 10 according to the invention in order to evaluate its fatigue resistance and thus its duration or service life.

[0201] Each of the reinforcing cords 10 comprises two yarns twisted together, one of which comprises a plurality of filaments made of 100% recycled PET with a linear density of 1680 dtex and a monofilament fabric thread made of 100% recycled PET with a diameter of 0.30 mm, and the other yarn comprises a plurality of filaments made of 100% recycled PET with a linear density of 1680 dtex. This reinforcing cord is designated INV.

[0202] The reinforcing cord INV was made by giving 310 twists to the two yarns in the right-hand direction and 180 twists to the reinforcing cord INV in the left-hand direction.

[0203] A test piece was made, which comprised a strip of elastomeric material on which was juxtaposed a layer of elastomeric material comprising reinforcing cords INV. The thickness of this layer was equal to 2 mm. The total thickness of the test piece was equal to 3.1 mm, the length was equal to 360 mm and the width was equal to 25 mm.

[0204] The specimens were cured at 151°C for 30 minutes and conditioned at room temperature for 16 hours.

[0205] The test pieces were subjected to bending / compression cycles according to standard ISO 132 in a Dematti type testing machine.

[0206] The above cycle was carried out for 4-8-16-24-48 hours, keeping the temperature under control so that the temperature did not exceed 70°C.

[0207] At the end of the test, the test piece was conditioned at room temperature for 16 hours. Thereafter, the reinforcing cord INV was taken out of the test piece and subjected to a traction test.

[0208] A similar test was also carried out on a test piece (reference test piece) which differed from the above test piece only in that it included a plurality of textile reinforcing cords of the type described in WO 2020 / 128943 A2. Such textile reinforcing cords are designated REF and, in the Applicant's opinion, have excellent fatigue resistance and therefore a high service life and are used in the carcass structure of the Applicant's vehicle tires.

[0209] Each of the reinforcing cords REF comprises two multifilament textile yarns twisted together, each of the two yarns comprising a plurality of filaments made of fossil-origin PET and a monofilament textile thread made of fossil-origin PET with a diameter equal to 0.30 mm. This reinforcing cord REF is also made by giving the two yarns 310 twists in the right-hand direction and 180 twists in the left-hand direction.

[0210] At the end of the test, the reinforcing cord REF was taken out from the above test piece and subjected to a traction test.

[0211] The fatigue resistance of each of the above-mentioned reinforcing cords REF is determined as the difference between the breaking load of a cord subjected to the above-mentioned test and the breaking load of a similar cord not subjected to the bending / compression cycle on the above-mentioned Dematier machine.

[0212] The Applicant has also determined the degradation of the reinforcing cord REF, understood as the ratio between the fatigue resistance determined above and the breaking load of a cord not subjected to the above-mentioned bending / compression cycles.

[0213] The results of the traction tests are given in Table 1 below.

[0214]

[0215] Table 1

[0216] Comparative tests therefore confirm that the reinforcing cord INV has an even longer service life (or less degradation) when stressed under fatigue than the reinforcing cord REF made as described in WO 2020 / 128943A2.

[0217] Therefore, in cases where it is considered preferable to have reinforcing cords that do not have excessive rigidity, the reinforcing cord INV of the invention can actually replace the latter in order to withstand bending stresses as is the case, for example, in carcass structures for automobile and motorcycle tires.

[0218] Of course, those skilled in the art may propose further modifications and variations to the above invention to meet specific possible application requirements. However, these modifications and variations are in any case within the scope of protection defined by the following claims.

Claims

1. A tire for a vehicle wheel, said tire comprising at least one structural component, said at least one structural component comprising a plurality of hybrid reinforcing cords (10), wherein: At least some of the hybrid reinforcing cords (10) include at least two yarns (20a, 20b) twisted together, each of the at least two yarns (20a, 20b) including a plurality of filaments (22a, 22b), wherein a single yarn (20a) of the at least two yarns (20a, 20b) further includes a single monofilament textile thread (21a), and in any cross-section of the single yarn (20a), the monofilament textile thread is at least partially embedded in the filaments (22a) of the single yarn (20a).

2. The tire according to claim 1, wherein: In any cross section of the individual yarn (20a), the monofilament textile thread (21a) is completely embedded in the filaments (22a) of the individual yarn (20a).

3. A tyre according to any one of the preceding claims, wherein: The diameter of the monofilament textile thread (21a) is greater than 0.22 mm.

4. A tyre according to any one of the preceding claims, wherein: The monofilament textile thread (21a) is made of at least partially recycled or bio-based material.

5. The tire according to claim 4, wherein: The monofilament textile threads are made from at least partially recycled or bio-based PET or nylon.

6. A tyre according to any one of the preceding claims, wherein: The filaments (22a) of the individual yarns (20a) are made from at least partially recycled or bio-based materials.

7. The tire according to claim 6, wherein: The filaments (22a) of the individual yarns (20a) are made from at least partially recycled or bio-based PET or nylon.

8. A tyre according to any one of the preceding claims, wherein: The filaments (22a) of at least one second yarn (20b) of the at least two yarns (20a, 20b) are made from at least partially recycled or bio-based materials.

9. The tire according to claim 8, wherein: The filaments (22b) of the at least one second yarn (20b) are made of at least partially recycled or bio-based PET or nylon.

10. The tire according to claim 8 or 9, wherein: The hybrid reinforcing cord (10) is composed of the single yarn (20a) and a single second yarn (20b).

11. The tire according to any one of the preceding claims, wherein: The at least one structural component is a carcass ply (3, 111) and / or a reinforcing layer (120, 121) associated with the carcass ply (111) at or near the respective turned-up end edges of the carcass ply (111).

12. A hybrid reinforcing cord (10), comprising at least two yarns (20a, 20b) twisted together, each of the at least two yarns (20a, 20b) comprising a plurality of filaments (22a, 22b), wherein: The single yarn (20a) of the at least two yarns (20a, 20b) further comprises a single monofilament textile thread (21a), which is at least partially embedded in the filaments (22a) of the single yarn (20a) in any cross section of the single yarn (20a).

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