WO2019202240A1 - Armature de protection de pneumatique pour vehicule lourd de type genie civil - Google Patents
Armature de protection de pneumatique pour vehicule lourd de type genie civil Download PDFInfo
- Publication number
- WO2019202240A1 WO2019202240A1 PCT/FR2019/050856 FR2019050856W WO2019202240A1 WO 2019202240 A1 WO2019202240 A1 WO 2019202240A1 FR 2019050856 W FR2019050856 W FR 2019050856W WO 2019202240 A1 WO2019202240 A1 WO 2019202240A1
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- WO
- WIPO (PCT)
- Prior art keywords
- layer
- equal
- protective
- civil engineering
- reinforcement
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
- B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/0007—Reinforcements made of metallic elements, e.g. cords, yarns, filaments or fibres made from metal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
- B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
- B60C9/2003—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel characterised by the materials of the belt cords
- B60C9/2006—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel characterised by the materials of the belt cords consisting of steel cord plies only
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C2009/0071—Reinforcements or ply arrangement of pneumatic tyres characterised by special physical properties of the reinforcements
- B60C2009/0078—Modulus
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
- B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
- B60C2009/2012—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel with particular configuration of the belt cords in the respective belt layers
- B60C2009/2016—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel with particular configuration of the belt cords in the respective belt layers comprising cords at an angle of 10 to 30 degrees to the circumferential direction
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
- B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
- B60C2009/2012—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel with particular configuration of the belt cords in the respective belt layers
- B60C2009/2019—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel with particular configuration of the belt cords in the respective belt layers comprising cords at an angle of 30 to 60 degrees to the circumferential direction
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
- B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
- B60C2009/2074—Physical properties or dimension of the belt cord
- B60C2009/2077—Diameters of the cords; Linear density thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
- B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
- B60C2009/2074—Physical properties or dimension of the belt cord
- B60C2009/208—Modulus of the cords
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
- B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
- B60C2009/2074—Physical properties or dimension of the belt cord
- B60C2009/2083—Density in width direction
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
- B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
- B60C2009/2074—Physical properties or dimension of the belt cord
- B60C2009/2093—Elongation of the reinforcements at break point
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
- B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
- B60C2009/2074—Physical properties or dimension of the belt cord
- B60C2009/2096—Twist structures
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C2200/00—Tyres specially adapted for particular applications
- B60C2200/06—Tyres specially adapted for particular applications for heavy duty vehicles
- B60C2200/065—Tyres specially adapted for particular applications for heavy duty vehicles for construction vehicles
Definitions
- the present invention relates to a radial tire intended to equip a heavy vehicle type civil engineering, and more particularly relates to the crown reinforcement of such a tire, and even more particularly its protective armature.
- a radial tire for heavy vehicle type civil engineering within the meaning of the standard of the European Tire and Rim Technical Organization or ETRTO, is intended to be mounted on a rim whose diameter is at least equal to 25 inches.
- ETRTO European Tire and Rim Technical Organization
- the invention is described for a radial tire of large size, intended to be mounted on a dumper, vehicle for transporting materials extracted from quarries or surface mines, via a rim with a diameter of at least 49 inches and up to 57 inches or 63 inches.
- a tire having a geometry of revolution with respect to an axis of rotation the geometry of the tire is generally described in a meridian plane containing the axis of rotation of the tire.
- the radial, axial and circumferential directions respectively designate the directions perpendicular to the axis of rotation of the tire, parallel to the axis of rotation of the tire and perpendicular to the meridian plane.
- the circumferential direction is tangent to the circumference of the tire.
- radially inner means “closer”, respectively “further from the axis of rotation of the tire”.
- axially inner means “closer” or “furthest from the equatorial plane of the tire” respectively, the equatorial plane of the tire being the plane passing through the middle of the running surface and perpendicular to the axis of rotation.
- a tire comprises a tread intended to come into contact with a ground via a rolling surface, the two axial ends of which are connected by means of two sidewalls with two beads. providing the mechanical connection between the tire and the rim on which it is intended to be mounted.
- a radial tire further comprises a reinforcing reinforcement, consisting of a crown reinforcement, radially inner to the tread, and a carcass reinforcement, radially inner to the crown reinforcement.
- the carcass reinforcement of a radial tire for a heavy vehicle of the civil engineering type usually comprises at least one carcass layer comprising reinforcements generally made of metal, coated with an elastomeric or elastomeric type polymeric material, obtained by mixing and called coating mixture.
- a carcass layer comprises a main part, connecting the two beads together and generally wrapping, in each bead, from the inside to the outside of the tire around a circumferential reinforcing element, most often a metal called a bead wire, to form a reversal.
- the metal reinforcements of a carcass layer are substantially parallel to each other and form, with the circumferential direction, an angle of between 85 ° and 95 °.
- the crown reinforcement of a radial tire for a heavy vehicle of the civil engineering type comprises a superposition of crown layers extending circumferentially, radially outwardly of the carcass reinforcement.
- Each crown layer consists of generally metallic reinforcements parallel to each other and coated with an elastomeric-type polymeric material or coating mixture.
- the protective layers constituting the protective armature and radially outermost
- the working layers constituting the armature and radially between the protective frame and the carcass reinforcement.
- the protective armature comprising at least one protective layer, essentially protects the working layers from mechanical or physico-chemical aggressions, capable of spreading through the tread radially inwardly of the tire.
- the protective armor often comprises two radially superimposed protective layers, formed of elastic metal reinforcements, parallel to each other in each layer and crossed from one layer to the next, forming, with the circumferential direction, angles at least equal to 10 °.
- the reinforcement comprising at least two working layers, has the function of belt the tire and give it rigidity and handling. It takes both mechanical loading of the tire, generated by the inflation pressure of the tire and transmitted by the carcass reinforcement, and mechanical stresses of rolling, generated by the rolling of the tire on a floor and transmitted by the tread . It must also withstand oxidation and shocks and perforations, thanks to its intrinsic design and that of the protective frame.
- the reinforcement usually comprises two radially superposed working layers, formed of non-extensible metal reinforcements, parallel to one another in each layer and crossed from one layer to the next, forming, with the circumferential direction, angles not more than 60 °, and preferably not less than 15 ° and not more than 45 °.
- a hooping frame To reduce the mechanical stress of inflation transmitted to the frame of work, it is known to have, radially outside the carcass reinforcement, a hooping frame.
- the hooping reinforcement whose function is to take up at least part of the mechanical loading of the tire, improves the endurance of the crown reinforcement by stiffening the crown reinforcement.
- the hooping frame can be positioned radially inside the working frame, between the two working layers of the working frame, or radially outside the working frame.
- the hooping reinforcement usually comprises two radially superimposed hooping layers, formed of metal reinforcements, parallel to each other in each layer and crossed from one layer to the next, forming, with the circumferential direction, angles at more equal to 10 °.
- a metal reinforcement is mechanically characterized by a curve representing the tensile force (in N), applied to the metal reinforcement, as a function of its relative elongation (in%), referred to as the force-force curve. elongation. From this force-elongation curve are deduced characteristics Mechanical tensile strength of the metal reinforcement, such as the structural elongation As (in%), the total elongation at break At (in%), the breaking force Fm (maximum load in N) and the breaking strength Rm (in MPa), these characteristics being measured according to ISO 6892 of 1984.
- the structural elongation As results from the relative positioning of the constituent metal son of the metal reinforcement under a low tensile force.
- the elastic elongation Ae results from the intrinsic elasticity of the metal of the metal wires, constituting the metal reinforcement, taken individually, the behavior of the metal according to a Hooke law.
- the plastic elongation Ap results from the plasticity, that is to say the irreversible deformation, beyond the elastic limit, of the metal of these individual metal wires.
- an extension module expressed in GPa, which represents the slope of the line tangent to the force-elongation curve at this point.
- GPa the so-called elastic modulus in extension or Young's modulus
- metal reinforcements there are usually elastic metal reinforcements, such as those used in the protective layers, and non-extensible or inextensible metal reinforcements, such as those used in the working layers.
- An elastic metal reinforcement is characterized by a structural elongation As at least equal to 1% and a total elongation at break At at least equal to 4%.
- an elastic metal reinforcement has an elastic modulus in extension at most equal to 150 GPa, and usually between 40 GPa and 150 GPa.
- a non-extensible metal reinforcement is characterized by a total elongation At, under a tensile force equal to 10% of the breaking force Fm, at most equal to 0.2%.
- a non-extensible metal reinforcement has an elastic modulus in extension usually between 150 GPa and 200 GPa.
- the tread of the tire is subjected to repeated shocks, or pounding, generating in particular dynamic shear stresses in the elastomeric mixtures, positioned in the vicinity of the axial ends of the working layers, these shear stresses being likely to cause local cracking and, ultimately, breaking the top.
- a protective reinforcement and more precisely a most radially inner protective layer with an axial width greater than the axial widths of the working layers, and more generally to the axial widths of all other top layers.
- Such a protective layer is called the protruding protective layer because it is axially overflowing with respect to the working layers.
- the most radially inner protective layer having the greatest axial width among all the crown layers, thus mechanically protects the axial end regions of the working layers from hammering by a damping effect.
- the tread of a tire is also frequently subjected to cuts likely to cross radially inwards to the protective armature, which prevents the propagation of cracks resulting from cuts up to the reinforcement of work: the protective reinforcement thus has a role of shield vis-à-vis the mechanical attacks of the frame of work.
- the inventors have given themselves the objective, for a radial tire for heavy vehicle type civil engineering, to increase the resistance to hammering of its crown reinforcement, when driving on stones, while maintaining good resistance to attacks of its crown reinforcement, when driving on sharp stones.
- a tire for a heavy vehicle of the civil engineering type comprising a crown reinforcement, radially inner to a tread and radially external to a carcass reinforcement, the crown reinforcement comprising, radially from the outside towards the inside, a protective reinforcement and a working reinforcement,
- the protective armature comprising at least one protective layer comprising elastic metal reinforcements having an elastic modulus in extension at most equal to 150 GPa, embedded in an elastomeric material, parallel to each other and forming, with a circumferential direction tangent to the circumference of the tire, an angle at least equal to 10 °,
- the working armature comprising two working layers respectively comprising non-extensible metal reinforcements having an elastic modulus in extension greater than 150 GPa and at most equal to 200 GPa, embedded in an elastomeric material, parallel to one another, forming, with the circumferential direction, an angle at least equal to 15 ° and at most equal to 45 °, and crossed from one working layer to the next,
- the protective armature comprising a most radially inner protective layer having an axial width LP1
- the working armature comprising a most radially inner working layer having an axial width LT1 at most equal to the axial width LP1,
- the most radially inner protective layer comprising elastic metal reinforcements having a diameter D distributed axially in an axial pitch P,
- the elastic metal reinforcements of the most radially inner protective layer having an elastic modulus in extension at least equal to 100 GPa and a diameter D at least equal to 3 mm, and being distributed axially in an axial pitch P at least equal to 1.2 times the diameter D.
- the inventors aimed at increasing the resistance to hammering of the crown reinforcement, propose, in the present invention, a protective reinforcement whose most radially inner protective layer, overflowing with respect to the working layer of the invention.
- more radially inner of the working frame comprises elastic metal reinforcements with an elastic modulus in extension and diameter sufficiently high, and distributed in a sufficient axial pitch. It has been found that a significant damping effect of the hammering was obtained with a most radially inner protective layer sufficiently flexible but not too much, hence the compromise of reinforcement features previously described.
- a minimum axial pitch avoids any contact between the reinforcements and the risk of associated corrosion propagation.
- the elastic metal reinforcements of the most radially inner protective layer have a diameter D at most equal to 6 mm. Beyond this value, the reinforcements become too rigid in bending and no longer provide their damping function, resulting in an increased risk of crack propagation in the elastomeric mixtures present at the axial ends of the working layers.
- the elastic metal reinforcements of the radially innermost protective layer are distributed axially in an axial pitch P at most equal to 1.5 times the diameter D. Beyond this axial pitch value, the space between reinforcements becomes too high and causes, in particular, excessive relaxation of the axial ends of the most radially inner protective layer, resulting in less effective protection vis-à-vis pounding.
- the protective layer of elastic metal reinforcements are multilayer cables of structure lxN comprising a single layer of N helically wound strands, each strand comprising an inner layer of M helical wound internal wires and an outer layer of K outer threads wound helically around the inner layer.
- This type of structure gives the reinforcement an elastic behavior as defined above.
- a preferred example of a multistrand cable for a protective layer according to the invention has the structure 4 * (3 + 8) .35 or 44.35.
- the protective layer of metal reinforcements advantageously form, with the circumferential direction, an angle at least equal to 15 ° and at most equal to 35 °. This is a range of values commonly encountered in the design of protective layers.
- the most radially inner protective layer preferably has an axial width LP1 of at least 1.05 times and at most equal to 1.25 times the axial width LT1 of the most radially inner working layer. Below 1.05 times the axial width LT1, the most radially inner protective layer is not sufficiently protruding with respect to the most radially inner working layer to be able to provide an effective protective role against pounding. . Beyond 1.25 times the axial width LT1, the axial end of the radially innermost protective layer is very close to the axial end of the tread, which increases the risk of cracking between the axial end. of said protective layer and the axial end of the tread.
- the elastic metal reinforcements of the radially innermost protective layer advantageously form, with the circumferential direction, an angle equal to that formed by the non-extensible metal reinforcements of the most radially inner working layer. These angles are oriented in the same direction relative to the equatorial plane of the tire, and are therefore equal in algebraic value. In other words the reinforcements of said protective layer are parallel to those of said working layer, which reduces the shear and therefore the risk of cracking in the vicinity of the axial end of said working layer.
- the protective reinforcement comprises two protective layers whose respective metal reinforcements are crossed from one protective layer to the next.
- a protective frame with two layers crossed relative to each other is a conventional design in the field of tires for heavy vehicles of the civil engineering type.
- the crown reinforcement also preferably comprises a hooping reinforcement comprising two frettage layers, the respective metal reinforcements, embedded in an elastomeric material, parallel to each other and forming, with the circumferential direction, an angle at most equal to 10. °, are crossed from one hooping layer to the next.
- the angle fretted layers are usually distinguished, with reinforcements forming angles at least equal to 6 ° and at most equal to 8 °, and the circumferential shrinking layers, with substantially circumferential reinforcements forming angles close to 0 ° and at most equal to 5 °.
- the hoop layer metal reinforcements may be either elastic or non-extensible.
- the hooping frame can be positioned radially inside the working frame, between the two working layers of the working frame, or radially outside the working frame.
- - Figure 1 Meridian section of a pneumatic tire for heavy vehicle type dumper according to the invention.
- FIG. 1 there is shown a meridian section of a tire 1 for a heavy vehicle type civil engineering dimension 53 / 80R63 comprising a crown reinforcement 3, radially inner to a tread 2 and radially external to a carcass reinforcement 4.
- the crown reinforcement 3 comprises, radially from the outside towards the inside, a protective reinforcement 5, a working reinforcement 6 and a hooping reinforcement 7.
- the protective reinforcement 5 comprises two layers protection device (51, 52) comprising elastic metal reinforcements embedded in an elastomeric material, parallel to each other and forming an angle equal to 33 °, with a circumferential direction XX 'tangent to the circumference of the tire, the respective metal reinforcements of each layer protection being crossed from one protective layer to the next.
- the working reinforcement 6 comprises two working layers (61, 62) whose respective non-extensible metal reinforcements, embedded in an elastomeric material, parallel to each other and forming, with the circumferential direction XX ', angles respectively equal to 33 °, for the most radially inner working layer 61, and 24 °, for the most radially outer working layer 62, are crossed from one working layer to the next.
- the radially innermost protective layer 51 is axially protruding from the radially innermost working layer 61, i.e. the radially innermost protective layer 51 has an axial width LP1 greater than the axial width LT1 of the most radially inner working layer 61.
- the axial width LP1 is equal to 1.2 times axial width LT1.
- the hooping frame 7 comprises two hooping layers (71, 72) whose respective metal reinforcements, embedded in an elastomeric material, parallel to each other and forming, with the circumferential direction XX ', an angle of between 6 ° and 10 ° , are crossed from one frettage layer to the next.
- FIG. 2 represents a meridian section of a portion of the most radially inner protective layer 51.
- the protective layer metal reinforcements each have a section of diameter D and are two by two spaced apart from an axial pitch P at least equal to 1.2 times the diameter D, the axial pitch P being the axial distance between the respective centers of the circular sections of two consecutive reinforcements.
- the reference tire R has a radially innermost protective layer having an axial width LP1 equal to 1120 mm, 120 mm greater than the axial width LT1 of the most radially inner working layer.
- these reinforcements have an elastic modulus in extension equal to 110 GPa, a diameter D equal to 1.9 mm, and are distributed axially in an axial pitch P equal to 2.5 mm, that is to say equal to 1.32 times the diameter D.
- the tire according to the invention I has a most radially inner protective layer having an axial width LP1 equal to 1120 mm, 190 mm greater than the axial width LT1 of the most radially inner working layer and therefore equal to at 1.2 times the axial width LT1.
- these reinforcements have an elastic modulus in extension equal to 130 GPa, thus greater than 100 GPa, a diameter D equal to 3.8 mm, thus greater than 3 mm, and are distributed axially in an axial pitch P equal to 4.9 mm, c that is to say equal to 1.3 times the diameter D, thus greater than 1.2 times the diameter D.
- the inventors have shown by numerical simulations of the finite element type that the shears in the elastomeric mixtures, positioned between the metal reinforcements of the axial end portions of the most radially inner working layer, as well as in the elastomeric mixtures , positioned radially inside or outside of said axial end portions, were decreased by 15% to 25% for the tire according to the invention I with respect to the reference tire R.
- the inventors also showed, on experimental tests in customer, that the life of the tire according to the invention I, before removal from the vehicle, was increased by about 12% compared to that of the reference tire R.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tires In General (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201980025308.2A CN111989228A (zh) | 2018-04-17 | 2019-04-11 | 用于重型土木工程车辆的轮胎的保护增强件 |
BR112020018418-7A BR112020018418A2 (pt) | 2018-04-17 | 2019-04-11 | Armadura de proteção de pneumático para veículo pesado de tipo de engenharia civil |
US17/048,476 US20210162811A1 (en) | 2018-04-17 | 2019-04-11 | Protective Reinforcement For A Tire For A Heavy Civil Engineering Vehicle |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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FR1853334 | 2018-04-17 | ||
FR1853334 | 2018-04-17 |
Publications (1)
Publication Number | Publication Date |
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WO2019202240A1 true WO2019202240A1 (fr) | 2019-10-24 |
Family
ID=63014703
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2019/050856 WO2019202240A1 (fr) | 2018-04-17 | 2019-04-11 | Armature de protection de pneumatique pour vehicule lourd de type genie civil |
Country Status (4)
Country | Link |
---|---|
US (1) | US20210162811A1 (fr) |
CN (1) | CN111989228A (fr) |
BR (1) | BR112020018418A2 (fr) |
WO (1) | WO2019202240A1 (fr) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5843583A (en) | 1996-02-15 | 1998-12-01 | N.V. Bekaert S.A. | Cord with high non-structural elongation |
WO2005014925A1 (fr) | 2003-07-22 | 2005-02-17 | N.V. Bekaert S.A. | Corde hybride a fort coefficient d'elongation |
WO2007090603A1 (fr) | 2006-02-09 | 2007-08-16 | Societe De Technologie Michelin | Cable composite elastique pour pneumatique |
WO2017093637A1 (fr) * | 2015-12-04 | 2017-06-08 | Compagnie Generale Des Etablissements Michelin | Armature de sommet de pneumatique pour véhicule lourd de type génie civil |
WO2017103478A1 (fr) * | 2015-12-15 | 2017-06-22 | Compagnie Générale Des Établissements Michelin | Sommet de pneumatique pour véhicule lourd de type génie civil |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4377110B2 (ja) * | 2002-06-28 | 2009-12-02 | 株式会社ブリヂストン | 空気入りタイヤ |
FR2981297B1 (fr) * | 2011-10-13 | 2013-10-25 | Michelin Soc Tech | Pneumatique comportant une couche d'elements de renforcement circonferentiels |
FR2983778B1 (fr) * | 2011-12-09 | 2014-08-01 | Michelin Soc Tech | Pneumatique comportant une couche d'elements de renforcement circonferentiels |
JPWO2013176082A1 (ja) * | 2012-05-24 | 2016-01-14 | 横浜ゴム株式会社 | 乗用車用空気入りラジアルタイヤ |
FR3033287B1 (fr) * | 2015-03-05 | 2017-03-10 | Michelin & Cie | Armature de sommet de pneumatique pour vehicule lourd de type genie civil |
FR3056150A1 (fr) * | 2016-09-16 | 2018-03-23 | Compagnie Generale Des Etablissements Michelin | Pneumatique comportant trois couches de travail |
CN111132854B (zh) * | 2017-09-22 | 2021-10-22 | 米其林集团总公司 | 用于施工场地类型的重型车辆的轮胎的胎冠增强件 |
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2019
- 2019-04-11 WO PCT/FR2019/050856 patent/WO2019202240A1/fr active Application Filing
- 2019-04-11 CN CN201980025308.2A patent/CN111989228A/zh active Pending
- 2019-04-11 US US17/048,476 patent/US20210162811A1/en not_active Abandoned
- 2019-04-11 BR BR112020018418-7A patent/BR112020018418A2/pt not_active Application Discontinuation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5843583A (en) | 1996-02-15 | 1998-12-01 | N.V. Bekaert S.A. | Cord with high non-structural elongation |
WO2005014925A1 (fr) | 2003-07-22 | 2005-02-17 | N.V. Bekaert S.A. | Corde hybride a fort coefficient d'elongation |
WO2007090603A1 (fr) | 2006-02-09 | 2007-08-16 | Societe De Technologie Michelin | Cable composite elastique pour pneumatique |
WO2017093637A1 (fr) * | 2015-12-04 | 2017-06-08 | Compagnie Generale Des Etablissements Michelin | Armature de sommet de pneumatique pour véhicule lourd de type génie civil |
WO2017103478A1 (fr) * | 2015-12-15 | 2017-06-22 | Compagnie Générale Des Établissements Michelin | Sommet de pneumatique pour véhicule lourd de type génie civil |
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Publication number | Publication date |
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US20210162811A1 (en) | 2021-06-03 |
CN111989228A (zh) | 2020-11-24 |
BR112020018418A2 (pt) | 2020-12-29 |
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