WO2004056587A1 - Tyre for two-wheeled vehicles - Google Patents
Tyre for two-wheeled vehicles Download PDFInfo
- Publication number
- WO2004056587A1 WO2004056587A1 PCT/EP2003/013559 EP0313559W WO2004056587A1 WO 2004056587 A1 WO2004056587 A1 WO 2004056587A1 EP 0313559 W EP0313559 W EP 0313559W WO 2004056587 A1 WO2004056587 A1 WO 2004056587A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- tyre
- wheeled vehicles
- elastomeric material
- layered inorganic
- vehicles according
- Prior art date
Links
Classifications
-
- 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
- B60C9/22—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel the plies being arranged with all cords disposed along the circumference of the tyre
- B60C9/2204—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel the plies being arranged with all cords disposed along the circumference of the tyre obtained by circumferentially narrow strip winding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
-
- 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
- B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
-
- 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
-
- 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
- B60C2009/1878—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers with flat cushions or shear layers between the carcass and the belt
-
- 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
- B60C2200/10—Tyres specially adapted for particular applications for motorcycles, scooters or the like
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T152/00—Resilient tires and wheels
- Y10T152/10—Tires, resilient
- Y10T152/10495—Pneumatic tire or inner tube
- Y10T152/10765—Characterized by belt or breaker structure
- Y10T152/1081—Breaker or belt characterized by the chemical composition or physical properties of elastomer or the like
Definitions
- the present invention relates to a tyre for two- wheeled vehicles. More particularly, the present invention relates to a tyre for two-wheeled vehicles comprising at least one layer of a crosslin ed elastomeric material comprising at least one layered inorganic material .
- the present invention moreover relates to a process for manufacturing said tyre.
- Said tyres are characterized by a high transverse curvature in order to provide good contact with the road surface when the motorcycles are steeply banked in cornering.
- Maintenance of a consistent ground contact area of "tyre footprint" under all conditions is a major problem in determining general vehicle handling.
- a motorcycle tyre comprising a tread reinforced between its edges by a breaker assembly and having in its normal inflated fitted condition a camber value C/L of between 0.5 and 0.7, a reinforcing carcass ply of rubber covered cords radially inside the breaker assembly and extending between two bead regions and wrapped in each bead region around an annular bead wire to form carcass ply turn-ups and between the tread edges and bead regions, tyre sidewalls, characterized in that under the tread is disposed radially inward of the breaker assembly a secondary carcass ply of rubber covered cords and between the carcass ply and the secondary carcass ply is disposed a rubber member extending from tread edge to tread edge.
- the resultant tyres would have not only an improved cornering power, damping and grip but also they would be stable and able to effectively resist collapse under severe breaking.
- British Patent Application GB 2 283 215 relates to a radial motorcycle tyre comprising a tread reinforced between its edges by a breaker assembly and a bandage and having in its normally inflated condition a camber value C/L of between 0.5 to 0.7, a reinforcing carcass ply of radially disposed cords extending radially inside the breaker assembly and between two bead regions and wrapped in each bead region around an annular bead wire from the axial inside to the outside to form carcass ply turn-ups and between the tread edges and bead regions, tyre sidewalls, characterized in that the breaker assembly comprises two breaker plies comprising aromatic polyamide cords oppositely inclined at between 16 and 30 degrees with respect to the circumferential direction of the tyre and the bandage comprises nylon cords reinforced material, e.g.
- US Patent 6 412 533 relates to a tyre comprising: a) a carcass structure including at least one ply provided with reinforcing cords essentially parallel to one another and oriented along directions inclined with respect to the equatorial plane of the tyre ; b) a belt structure coaxially extending around the carcass structure, including: i) a radially inner layer comprising at least one sheet made of an elastomeric material; ii) a radially outer layer including a plurality of circumferential coils, axially arranged side by side, of at least one inextensible cord, circumferentially wound at a substantially null angle with respect to the equatorial plane of the tyre; c) a tread coaxially extending around the belt structure.
- said sheet made of an elastomeric material incorporates appropriate binding means suitable to increase its stretcheability properties without substantially altering the adhesion properties of the elastomeric material in the green state.
- said binding means comprise the so-called aramid pulp (short fibrillated fibers of poly- paraphenylene-terephthalamide) , of the type commercially known as "Kevlar ' -pulp" from DuPont or Twaron " -pulp” from Akzo.
- said short fibrillated fibers are preoriented, for instance by means of a calendering operation, according to the main direction of the forces which the supporting element is subjected during the tyre manufacturing process.
- Such direction is usually the circumferential direction of the tyre and said preorientation is preferably carried out by calendering said sheet during its manufacture.
- the Applicant has noticed that, the use of a layer made of an elastomeric material comprising short fibrillated fiber of poly-paraphenylene-terephthalamide associated with the belt structure as disclosed above, gives to the motorcycle tyre essentially a longitudinal reinforcement (e.g. said reinforcement is essentially in the circumferential direction of the tyre) .
- a transversal reinforcement is also important to achieve a reliable behaviour of the motorcycle tyre, particularly during bending when the tyre is subjected to remarkable transversal forces.
- the Applicant has now found that it is possible to give an effective reinforcement, both in longitudinal and in transversal direction, under the tread of a motorcycle tyre, by using at least one layer of a crosslinked elastomeric material comprising at least one layered inorganic material, associated with a belt structure .
- the present invention thus relates to a tyre for two-wheeled vehicles, comprising: - a carcass structure with at least one carcass ply shaped in a substantially toroidal configuration, the opposite lateral edges of which are associated with respective right-hand and left-hand bead wires, each bead wire being enclosed in a respective bead; - a belt structure applied in a circumferentially external position relative to said carcass structure; a tread band superimposed circumferentially on said belt structure; a pair of side walls applied laterally on opposite sides relative to said carcass structure; wherein said belt structure is associated with at least one layer of a crosslinked elastomeric material comprising:
- said belt structure comprises: (i) at least one layer of a plurality of circumferential coils, axially arranged side by side, of at least one cord wound at substantially- null angle with respect to the equatorial plane of the tyre ; or (ii) two layers of cords oriented according to two preferred directions crossing each other in the two layers and preferably simmetrically inclined in relation to the equatorial plane of the tyre; or (iii) a combination of (i) and (ii) .
- said at least one layer of a crosslinked elastomeric material is placed between said carcass structure and said belt structure.
- said at least one layer of a crosslinked elastomeric material is placed between said tread band and said belt structure.
- the present invention relates to a process for producing a tyre for two- wheeled vehicles, said process comprising the following steps: manufacturing a green tyre by assembling at least one carcass ly a belt structure in a circumferentially outer position with respect to said carcass ply, a tread in a circumferentially outer position with respect to said belt structure; - subjecting the green tyre to moulding in a mould cavity formed in a vulcanization mould; subjecting said green tyre to crosslinking by heating; said process further comprising the step of associating at least one layer of a crosslinkable elastomeric material with said belt structure, said elastomeric material comprising:
- said at least one layer of a crosslinkable elastomeric material is obtained by winding at least one ribbon-like band consisting of said crosslinkable elastomeric material in side by side coils.
- Said ribbon-like band may be produced, for example, by extruding said crosslinkable elastomeric material.
- said layered inorganic material (b) is intercalated in the elastomeric material .
- said inorganic material (b) is exfoliated in the elastomeric material .
- the term "intercalated in the elastomeric material” means that the diene elastomeric polymer (a) is disposed between the layers of the layered inorganic material (b) so as to form a nanocomposite of ordered multilayers with alternating polymer/inorganic layers.
- the term “exfoliated in the elastomeric material” means that a nanocomposite is formed wherein the layers of said layered inorganic material (b) are individually dispersed throughout the elastomeric material .
- the structure of the layered inorganic material (b) may be determined by using X-ray diffraction (XRD) or transmission electron microscopy (TEM) . More information about both the morphology and the characterization of said layered inorganic material may be found, for example, in: "Polymer-Silicate Nanocomposites : Model Systems for Confined Polymers and Polymer Brushes", E.P. Giannelis, R. Krishnamoorti, E. Manias, Advances in Polymer Science (1999), Vol. 138, Springer-Verlag, Berlin, Heidelberg, pg.107-147
- said layered inorganic material (b) exhibits, in the elastomeric material, a d-spacing value in X-ray diffraction analysis of at least 10% higher, preferably of at least 20% higher, with respect to the d-spacing value of the layered inorganic material (b) before dispersing it into the diene elastomeric polymer (a) .
- the d-spacing value corresponds to the value of the distance between the crystal planes of the layered inorganic material (b) in the elastomeric material, in particular said value is the average distance between the corresponding surfaces of contiguous layers of the layered inorganic material .
- the effective distance between the continuous layers is obtained by subtracting the thickness of the individual layer from the d-spacing value.
- said layered inorganic material (b) is present in the elastomeric material in an amount of from 1 phr to 120 phr, preferably from 5 phr to 80 phr.
- phr means the parts by weight of a given component of the elastomeric material per 100 parts by weight of the diene elastomeric polymer.
- said at least one layer of elastomeric material has a thickness of between 0.075 mm and 5 mm, preferably between 0.4 mm and 3 mm.
- said elastomeric material further comprises at least one silane coupling agent (c) .
- the layered inorganic material (b) which may be used in the present invention may be selected, for example, from phyllosilicates such as: smectites, for example, montmorillonite, nontronite, beidellite, volkonskoite, hectorite, saponite, sauconite; vermiculite; halloisite; sericite; or mixtures thereof. Montmorillonite is particularly preferred.
- said layered inorganic material may be surface- treated with a co patibilizer .
- said compatibilizer may be selected, for example, from the quaternary ammonium or phosphonium salts having general formula (I) :
- Y represents N or P
- Ri, R 2 , R 3 and R 4 which may be identical or different, represent a linear or branched C ⁇ -C 2 o alkyl or hydroxyalkyl group; a linear or branched C ⁇ -C 20 alkenyl or hydroxyalkenyl group; a group -R 5 - SH or R 5 -NH wherein R 5 represents a linear or branched C 3. -C 20 alkylene group; a C 5 -C ⁇ 8 aryl group; a C 7 -C 2 o arylalkyl or alkylaryl group; a C 5 -C ⁇ 8 cycloalkyl group, said cycloalkyl group possibly containing hetero atom such as oxygen, nitrogen or sulphur;
- X n" represents an anion such as the chlorine ion, the sulphate ion or the phosphate ion; n represents 1, 2 or 3.
- Example of layered inorganic material (b) which may be used according to the present invention and is available commercially is the product known by the name of Dellite " 67G from Laviosa Chimica Mineraria S.p.A.
- the diene elastomeric polymer (a) which may be used in the present invention may be selected from those commonly used in sulphur-crosslinkable elastomeric compositions, that are particularly suitable for producing tyres, that is to say from elastomeric polymers or copolymers with an unsaturated chain having a glass transition temperature (T g ) generally below 20°C, preferably in the range of from 0°C to -90°C.
- T g glass transition temperature
- These polymers or copolymers may be of natural origin or may be obtained by solution polymerization, emulsion polymerization or gas-phase polymerization of one or more conjugated diolefins, optionally blended with at least one comonomer selected from onovinylarenes and/or polar co onomers in an amount of not more than 60% by weight.
- the conjugated diolefins generally contain from 4 to 12, preferably from 4 to 8 carbon atoms, and may be selected, for example, from the group comprising: 1,3- butadiene, isoprene, 2 , 3 -dimethyl-1, 3 -butadiene, 1,3- pentadiene, 1, 3-hexadiene, 3-butyl-l, 3-octadiene, 2-phenyl-1, 3 -butadiene, or mixtures thereof. 1,3- butadiene and isoprene are particularly preferred.
- Monovinylarenes which may optionally be used as comonomers generally contain from 8 to 20, preferably from 8 to 12 carbon atoms, and may be selected, for example, from: styrene; 1-vinylnaphthalene; 2- vinylnaphthalene; various alkyl, cycloalkyl, aryl, alkylaryl or arylalkyl derivatives of styrene such as, for example, ⁇ -methylstyrene, 3-methylstyrene, 4-propylstyrene, 4-cyclohexylstyrene, 4-dodecylstyrene, 2-ethyl-4-benzylstyrene, 4-p-tolylstyrene, 4- (4- phenylbutyl) styrene, or mixtures thereof.
- Styrene is particularly preferred.
- Polar comonomers which may optionally be used may be selected, for example, from: vinylpyridine, vinylquinoline, acrylic acid and alkylacrylic acid esters, nitriles, or mixtures thereof, such as, for example, methyl acrylate, ethyl acrylate, methyl methacrylate, ethyl methacrylate, acrylonitrile, or mixtures thereof .
- the diene elastomeric polymer (a) which may be used in the present invention may be selected, for example, from: cis-1, 4-polyisoprene (natural or synthetic, preferably natural rubber), 3 , 4-polyisoprene, polybutadiene (in particular polybutadiene with a high 1,4-cis content), optionally halogenated isoprene/isobutene copolymers, 1,3- butadiene/acrylonitrile copolymers, styrene/1,3- butadiene copolymers, styrene/isoprene/1 , 3-butadiene copolymers , styrene/l , 3-butadiene/acrylonitrile copolymers, or mixtures thereof.
- the elastomeric material according to the present invention may optionally comprise at least one elastomeric polymer of one or more monoolefins with an olefinic comonomer or derivatives thereof (a' ) .
- the monoolefins may be selected from: ethylene and ⁇ -olefins generally containing from 3 to 12 carbon atoms, such as, for example, propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, or mixtures thereof.
- copolymers between ethylene and an ⁇ -olefin optionally with a diene
- isobutene homopolymers or copolymers thereof with small amounts of a diene which are optionally at least partially halogenated.
- the diene optionally present generally contains from 4 to 20 carbon atoms and is preferably selected from: 1,3- butadiene, isoprene, 1,4-hexadiene, 1, 4-cyclohexadiene,
- EPR ethylene/propylene copolymers
- EPDM ethylene/propylene/diene copolymers
- polyisobutene butyl rubbers
- halobutyl rubbers in particular chlorobutyl or bromobutyl rubbers
- mixtures thereof ethylene/propylene copolymers
- a diene elastomeric polymer (a) or an elastomeric polymer (a') functionalized by reaction with suitable terminating agents or coupling agents may also be used.
- the diene elastomeric polymers obtained by anionic polymerization in the presence of an organometallic initiator may be functionalized by reacting the residual organometallic groups derived from the initiator with suitable terminating agents or coupling agents such as, for example, imines, carbodiimides, alkyltin halides, substituted benzophenones, alkoxysilanes or aryloxysilanes (see, for example, European patent EP 451 604, or patents US 4 742 124 and US 4 550 142) .
- the elastomeric material according to the present invention further comprises at least one silane coupling agent (c) .
- the silane coupling agent (c) which may be used in the present invention may be selected from those having at least one hydrolizable silane group which may be identified, for example, by the following structural formula (II) :
- R 3 Si-C n H 2n -X (II) in which the groups R, which may be identical or different, are selected from: alkyl, alkoxy or aryloxy groups or from halogen atoms, on condition that at least one of the groups R is an alkoxy or aryloxy group; n is an integer between 1 and 6 inclusive; X is a group selected from: nitroso, mercapto, amino, epoxide, vinyl, imide, chloro, - (S) m C n H 2n -Si- (R) 3 in which m and n are integers between 1 and 6 inclusive and the groups R are defined as above.
- the coupling agents that are particularly preferred are bis (3-triethoxysilylpropyl) tetrasulphide and bis (3-triethoxysilylpropyl) disulphide.
- Said coupling agents may be used as such or as a suitable mixture with an inert filler (for example carbon black) so as to facilitate their incorporation into the elastomeric material .
- said coupling agent (c) is present in the elastomeric material in an amount of from 0.01 phr to 10 phr, preferably from 0.5 phr to 5 phr.
- At least one additional reinforcing filler may advantageously be added to the elastomeric material according to the present invention, in an amount generally of from 0.1 phr to 120 phr, preferably from 20 phr to 90 phr.
- the total amount of said at least one additional reinforcing filler and the layered inorganic material (b) is not higher than 120 phr.
- the reinforcing filler may be selected from those commonly used for crosslinked manufactured products, in particular for tyres, such as, for example, carbon black, silica, alumina, aluminosilicates, calcium carbonate, kaolin, or mixtures thereof.
- the types of carbon black which may be used according to the present invention may be selected from those conventionally used in the production of tyres, generally having a surface area of not less than 20 m 2 /g (determined by CTAB absorption as described in ISO standard 6810) .
- the silica which may be used according to the present invention may generally be a pyrogenic silica or, preferably, a precipitated silica, with a BET surface area (measured according to ISO standard 5794/1) of from 50 m 2 /g to 500 m 2 /g, preferably from 70 m 2 /g to 200 m 2 /g.
- the elastomeric material may advantageously incorporate at least one silane coupling agent (c) capable of interacting with the silica and of linking it to the diene elastomeric polymer during the vulcanization.
- silane coupling agent (c) capable of interacting with the silica and of linking it to the diene elastomeric polymer during the vulcanization. Examples of silane coupling agent (c) which may be used have been already disclosed above.
- the elastomeric material according to the present invention may be vulcanized according to known techniques, in particular with sulphur-based vulcanizing systems commonly used for diene elastomeric polymers .
- the vulcanizing agent most advantageously used is sulphur, or molecules containing sulphur (sulphur donors) , with accelerators and activators known to those skilled in the art.
- Activators that are particularly effective are zinc compounds, and in particular ZnO, ZnC0 3 , zinc salts of saturated or unsaturated fatty acids containing from 8 to 18 carbon atoms, such as, for example, zinc stearate, which are preferably formed in situ in the elastomeric material from ZnO and fatty acid, and also BiO, PbO, Pb 3 0 4 , Pb0 2 , or mixtures thereof.
- Accelerators that are commonly used may be selected from: dithiocarbamates, guanidine, thiourea, thiazoles, sulphenamides, thiurams, amines, xanthogenates, or mixtures thereof .
- the elastomeric material according to the present invention may comprise other commonly used additives selected on the basis of the specific application for which the composition is intended.
- the following may be added to said composition: antioxidants, anti-ageing agents, adhesives, anti-ozone agents, modifying resins, fibres (for example Kevlar " pulp), or mixtures thereof.
- a plasticizer generally selected from mineral oils, vegetable oils, synthetic oils, or mixtures thereof, such as, for example, aromatic oil, naphthenic oil, phthalates, soybean oil, or mixtures thereof, may be added to the elastomeric material according to the present invention.
- the amount of plasticizer generally ranges from 1 phr to 100 phr, preferably from 5 phr to 50 phr.
- the elastomeric material according to the present invention may be prepared by mixing together the diene elastomeric polymer (a) with the layered inorganic material (b) , with the additional reinforcing filler and with the other additives optionally present, according to techniques known in the art .
- the mixing may be carried out, for example, using an open mixer of open- mill type, or an internal mixer of the type with tangential rotors (Banbury) or with interlocking rotors (Intermix) , or using continuous mixers of Ko-Kneader type (Buss) , or using co-rotating or counter-rotating twin-screw extruders or single-screw extruders.
- Fig. 1-2 are a view in cross section of a tyre made according to different embodiments of the present invention.
- a high-transverse-curvature tyre for two-wheeled vehicles according to the invention has been generally identified by reference number (1) .
- X-X indicates the equatorial plane of the tyre (1) .
- the tyre (1) comprises a carcass structure (2) comprising at least one carcass ply (3) , the opposite lateral edges (3a) of which are associated with respective bead wires (4) .
- the association between the carcass ply (3) and the bead wires (4) is achieved here by folding back the opposite lateral edges (3a) of the carcass ply (3) around the bead wires (4) so as to form the so-called carcass back-folds (3a) as shown in Fig. 1.
- the conventional bead wires (4) can be replaced with at least one circumferentially inextensible annular insert formed from elongate element arranged in concentric coils (not represented in Fig. 1) (see, for example, European Patent EP 976 536 and International Patent Application WO 01/54926) .
- the carcass ply (3) is not back-folded around said annular inserts, the coupling being provided by a second carcass ply (not represented in Fig. 1) applied externally over the first.
- the carcass ply (3) generally consists of a plurality of reinforcing cords arranged parallel to each other and at least partially coated with a layer of elastomeric material .
- reinforcing cords are usually made of textile fibres, for example rayon, nylon, polyethylene naphthalene-2 , 6-dicarboxylate (PEN), polyethylene terephthalate (PET) , or of steel wires stranded together, coated with a metal alloy (for example copper/zinc, zinc/manganese, zinc/molybdenum/cobalt alloys and the like) .
- the carcass structure (2) is of radial type, i.e. the carcass ply (3) incorporates reinforcing cords arranged in a substantially perpendicular direction relative to a circumferential direction.
- the carcass structure (2) comprises a couple of radially inner and radially outer carcass plies (not represented in Fig. 1) .
- the reinforcing cords are essentially parallel to one another and oriented according to inclined directions in each ply and opposed with respect to the cords of the adjacent ply with respect to the equatorial plane X-X of the tyre (1) .
- an elastomeric filler (5) is applied which fills the space defined between the carcass structure (2) and the corresponding carcass back-folds (3a) .
- the tyre area comprising bead wires (4) and elastomeric filler (5) forms the so-called bead, globally indicated as (10) , intended for anchoring the tyre (1) onto a corresponding mounting rim (not shown in Fig. 1) .
- a belt structure (6) is applied along the circumference of the carcass structure (2) .
- the belt structure (6) comprises one layer including a plurality of circumferential coils (7a) , axially arranged side by side, of a rubberized cord (7) or of a strip of a few rubberized cords (preferably 2 to 5) , spirally wound at substantially-null angle from one end to the other of the carcass structure (2) .
- the cords (7) form a plurality of circumferential coils (7a) , substantially oriented according to the rolling direction of the tyre, usually called "zero-degree" arrangement with reference to its position with respect to the equatorial plane X-X the tyre (1) .
- the circumferential coils are wound on the carcass structure (2) according to variable pitch so as to obtain, preferably, a cord thickness higher at opposite side portions that in the central portion of the belt structure (6) .
- said cords (7) are textile or metal cords.
- said cords (7) are steel cords, more preferably high elongation (HE) steel cords (see, for example, European Patent EP 461 646) .
- HE high elongation
- such cords are made of high-carbon (HT) steel wires, i.e. steel wires with a carbon content higher than 0.9%.
- HT high-carbon
- textile cords they may be nylon, rayon, polyethylene naphthalene-2 , 6-dicarboxylate (PEN), polyethylene terephthalate (PET) , aromatic polya ide fibres (e.g. aramide fibres such as, for example, Kevlar " ).
- hybrid cords may be used, constituted by at least one low modulus yarn (e.g. nylon or rayon) twisted with at least one high modulus yarn (e.g. aramide fibres such as, for example, Kevlar ) .
- a side wall (11) is also applied externally onto the carcass ply (3) , this side wall extending, in an axially external position, from the bead (10) to the end of the belt structure (6) .
- a tread band (8) whose lateral edges are connected to the side walls (11) , is applied circumferentially in a position radially external to the belt structure (6) .
- the tread band (8) has a rolling surface
- a layer of a crosslinked elastomeric material (9) is placed between the belt structure (7) and the carcass ply (3) .
- said layer (9) extends over a surface substantially corresponding to the surface of development of said belt structure (6) .
- said layer (9) extends only along at least one portion of the development of said belt structure (6) , for instance at opposite side portions of said belt structure (6) (not represented in Fig. 1) .
- a rubber layer (not shown in Fig 1) generally known as a "liner”, which provides the necessary impermeability to the inflation air of the tyre, may also be provided in a radially internal position relative to the carcass ply (3) .
- Fig. 2 show the same tyre (1) of Fig. 1 the only difference being the fact that a layer of a crosslinked elastomeric material (9) according to the present invention is interposed between the tread band (8) and the belt structure (6) .
- said layer (9) extends over a surface substantially corresponding to the surface of development of said belt structure (6) .
- said layer (9) extends only along at least one portion of the development of said belt structure (6) , for instance at opposite side portions of said belt structure (6) (not represented in Fig. 2) .
- a further layer of a crosslinked elastomeric material according to the present invention is placed between the belt structure (7) and the carcass ply (3) (not represented in Fig. 2) .
- the process for producing the tyre according to the present invention may be carried out according to techniques and using apparatus that are known in the art, as described, for example, in patents EP 461 646 and EP 718 122, said process including at least one step of manufacturing the green tyre and at least one step of vulcanizing this tyre.
- the process for producing the tyre comprises the steps of preparing, beforehand and separately from each other, a series of semi-finished products corresponding to the various parts of the tyre
- the step of preparing the abovementioned semi- finished products will be preceded by a step of preparing and moulding the various blends, of which said semi-finished products are made, according to conventional techniques.
- the green tyre thus obtained is then passed to the subsequent steps of moulding and vulcanization.
- a vulcanization mould is used which is designed to receive the tyre being processed inside a moulding cavity having walls which are countermoulded to define the outer surface of the tyre when the vulcanization is complete.
- Alternative processes for producing a tyre or parts of a tyre without using semi-finished products are disclosed, for example, in the abovementioned European Patent EP 976 536 and International Patent Application
- the green tyre may be moulded by introducing a pressurized fluid into the space defined by the inner surface of the tyre, so as to press the outer surface of the green tyre against the walls of the moulding cavity.
- a vulcanization chamber made of elastomeric material, filled with steam and/or another fluid under pressure, is inflated inside the tyre closed inside the moulding cavity.
- the moulding may be carried out without an inflatable vulcanization chamber, by providing inside the tyre a toroidal metal support shaped according to the configuration of the inner surface of the tyre to be obtained as decribed, for example, in patent EP 242 840.
- the difference in coefficient of thermal expansion between the toroidal metal support and the crude elastomeric material is exploited to achieve an adequate moulding pressure.
- the step of vulcanizing the crude elastomeric material present in the tyre is carried out.
- the outer wall of the vulcanization mould is placed in contact with a heating fluid (generally steam) such that the outer wall reaches a maximum temperature generally of between 100°C and 230°C.
- a heating fluid generally steam
- the inner surface of the tyre is heated to the vulcanization temperature using the same pressurized fluid used to press the tyre against the walls of the moulding cavity, heated to a maximum temperature of between 100°C and 250°C.
- the time required to obtain a satisfactory degree of vulcanization throughout the mass of the elastomeric material may vary in general between 3 min and 90 min and depends mainly on the dimensions of the tyre.
- the tyre is removed from the vulcanization mould.
- other crosslinked elastomeric manufactured products that may be produced according to the invention may be, for example, conveyor belts, driving belts or flexible tubes.
- the present invention will be further illustrated below by means of a number of preparation examples, which are given for purely indicative purposes and without any limitation of this invention.
- the elastomeric materials given in Table 1 were prepared as follows (the amounts of the various ingredients are given in phr) .
- Antioxidant phenyl-p-phenylenediamine; TESPT: bis (3-triethoxysilylpropyl) tetrasulfide (X50S comprising 50% of carbon black and 50% of silane -
- Kevlar Engineered Elastomer blend of 23% by weight of
- Table 2 also shows the dynamic mechanical properties measured using an Instron dynamic device in the traction-compression mode according to the following methods.
- the dynamic mechanical properties are expressed in terms of dynamic elastic modulus (E') and tandelta (loss factor) values.
- E' dynamic elastic modulus
- tandelta loss factor
- Tyres according to Fig. 1 were prepared containing layers of elastomeric material according to Example 2 (Example 5 - reference) and according to Example 3 (Example 6 - according to the present invention) extending over a surface substantially corresponding to the surface of development of the zero-degree belt structure.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Tires In General (AREA)
- Automatic Cycles, And Cycles In General (AREA)
- Tyre Moulding (AREA)
- Regulating Braking Force (AREA)
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2003292167A AU2003292167A1 (en) | 2002-12-23 | 2003-12-02 | Tyre for two-wheeled vehicles |
US10/536,833 US20060137797A1 (en) | 2002-12-23 | 2003-12-02 | Tyre for a two-wheeled vehicle |
DE60326492T DE60326492D1 (en) | 2002-12-23 | 2003-12-02 | TIRES FOR TWO-WHEELED VEHICLES |
JP2004561204A JP2006511386A (en) | 2002-12-23 | 2003-12-02 | Tires for motorcycles |
BRPI0317231-7A BR0317231B1 (en) | 2002-12-23 | 2003-12-02 | pneumatic for two-wheeled vehicles, process to produce the same. |
EP03767722A EP1597093B1 (en) | 2002-12-23 | 2003-12-02 | Tyre for two-wheeled vehicles |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2002/014717 WO2004056586A1 (en) | 2002-12-23 | 2002-12-23 | Tyre for two-wheeled vehicles |
EPPCT/EP02/14717 | 2002-12-23 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004056587A1 true WO2004056587A1 (en) | 2004-07-08 |
Family
ID=32668682
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2002/014717 WO2004056586A1 (en) | 2002-12-23 | 2002-12-23 | Tyre for two-wheeled vehicles |
PCT/EP2003/013559 WO2004056587A1 (en) | 2002-12-23 | 2003-12-02 | Tyre for two-wheeled vehicles |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2002/014717 WO2004056586A1 (en) | 2002-12-23 | 2002-12-23 | Tyre for two-wheeled vehicles |
Country Status (7)
Country | Link |
---|---|
US (1) | US20060137797A1 (en) |
JP (1) | JP2006511386A (en) |
AT (1) | ATE424314T1 (en) |
AU (1) | AU2003292167A1 (en) |
BR (1) | BR0317231B1 (en) |
DE (1) | DE60326492D1 (en) |
WO (2) | WO2004056586A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103596773A (en) * | 2011-05-30 | 2014-02-19 | 倍耐力轮胎股份公司 | High performance tyre for vehicle wheels |
Families Citing this family (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005002883A1 (en) * | 2003-06-24 | 2005-01-13 | Pirelli Pneumatici S.P.A. | Tyre for vehicle wheels with tread band of cap and base construction |
CN100554325C (en) * | 2003-10-31 | 2009-10-28 | 倍耐力轮胎公司 | High-performance wheel tire |
ATE430660T1 (en) * | 2004-07-28 | 2009-05-15 | Pirelli | TIRE COMPRISING AN EPOXIDIZED ELASTOMIC POLYMER AND CROSS-LINKABLE ELASTOMIC COMPOSITION |
DE602005012160D1 (en) * | 2005-04-28 | 2009-02-12 | Pirelli | |
US20090247682A1 (en) * | 2005-10-26 | 2009-10-01 | Maurizio Galimberti | Method for Producing a Crosslinkable Elastomeric Composition |
WO2007062671A1 (en) * | 2005-11-29 | 2007-06-07 | Pirelli Tyre S.P.A. | Tire and crosslinkable elastomeric composition |
WO2007062669A1 (en) * | 2005-11-29 | 2007-06-07 | Pirelli Tyre S.P.A. | Tire and crosslinkable elastomeric composition |
EP2102017B1 (en) | 2006-12-13 | 2010-12-01 | Pirelli Tyre S.p.A. | Tire and crosslinkable elastomeric composition |
JP5139099B2 (en) * | 2008-01-31 | 2013-02-06 | 英介 山田 | Golf ball |
JP5331544B2 (en) * | 2008-04-21 | 2013-10-30 | ダンロップスポーツ株式会社 | Golf ball |
JP5305718B2 (en) * | 2008-04-21 | 2013-10-02 | ダンロップスポーツ株式会社 | Golf ball |
DE102008039218A1 (en) * | 2008-08-22 | 2010-02-25 | Woco Industrietechnik Gmbh | Vulcanizable rubber compounds and elastomer molded parts obtainable from these rubber compounds |
JP4964921B2 (en) * | 2009-06-29 | 2012-07-04 | Sriスポーツ株式会社 | Golf ball |
ITMI20110975A1 (en) * | 2011-05-30 | 2012-12-01 | Pirelli | HIGH-PERFORMANCE TIRE FOR WHEELS OF MOTOR VEHICLES |
WO2016176080A1 (en) | 2015-04-30 | 2016-11-03 | Bridgestone Americas Tire Operations, Llc | Rubber-covered textile cords, tires containing same, and related methods |
CN107698821B (en) * | 2017-11-02 | 2019-10-22 | 山东兴鸿源轮胎有限公司 | A kind of high abrasion tire tread compound and preparation method thereof |
IT202100028292A1 (en) * | 2021-11-08 | 2023-05-08 | Pirelli | Motorcycle tire |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3686113A (en) * | 1965-05-24 | 1972-08-22 | Burke Oliver W Jun | Silica pigments and elastomer-silica pigment masterbatches and production processes relating thereto |
US4431755A (en) * | 1982-07-16 | 1984-02-14 | Standard Oil Company (Indiana) | Rubber composition comprising phyllosilicate minerals, silanes, and quaternary ammonium salts |
EP0747323A1 (en) * | 1995-06-07 | 1996-12-11 | Amcol International Corporation | Intercalates; exfoliates; process for manufacturing intercalates and exfoliates and composite materials containing same |
EP1193085A2 (en) * | 2000-09-27 | 2002-04-03 | The Goodyear Tire & Rubber Company | Tire with a least one of rubber/cord laminate, sidewall insert and apex of a rubber composition which contains oriented intercalated and/or exfoliated clay reinforcement |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58189203A (en) * | 1982-04-30 | 1983-11-04 | Nippon Zeon Co Ltd | Rubber composition |
JPS60255838A (en) * | 1984-06-01 | 1985-12-17 | Japan Synthetic Rubber Co Ltd | Tire rubber composition |
US5339878A (en) * | 1990-05-18 | 1994-08-23 | Bridgestone Corporation | Pneumatic tires for motorcycles including a spirally wound belt cord layer |
JPH1086604A (en) * | 1996-09-13 | 1998-04-07 | Bridgestone Corp | Pneumatic radial tire |
US6412533B1 (en) * | 1997-12-29 | 2002-07-02 | Pirelli Pneumatici S.P.A. | High transverse-curvature tire for two-wheeled vehicles including specified belt structure |
JP2001354005A (en) * | 2000-04-12 | 2001-12-25 | Bridgestone Corp | Tire reinforcing member, and pneumatic tire using thereof |
BR0105083A (en) * | 2000-11-17 | 2002-06-25 | Goodyear Tire & Rubber | Light rubber composition containing clay |
US6858665B2 (en) * | 2001-07-02 | 2005-02-22 | The Goodyear Tire & Rubber Company | Preparation of elastomer with exfoliated clay and article with composition thereof |
-
2002
- 2002-12-23 WO PCT/EP2002/014717 patent/WO2004056586A1/en unknown
-
2003
- 2003-12-02 BR BRPI0317231-7A patent/BR0317231B1/en not_active IP Right Cessation
- 2003-12-02 DE DE60326492T patent/DE60326492D1/en not_active Expired - Lifetime
- 2003-12-02 US US10/536,833 patent/US20060137797A1/en not_active Abandoned
- 2003-12-02 JP JP2004561204A patent/JP2006511386A/en active Pending
- 2003-12-02 AU AU2003292167A patent/AU2003292167A1/en not_active Abandoned
- 2003-12-02 WO PCT/EP2003/013559 patent/WO2004056587A1/en active Application Filing
- 2003-12-02 AT AT03767722T patent/ATE424314T1/en not_active IP Right Cessation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3686113A (en) * | 1965-05-24 | 1972-08-22 | Burke Oliver W Jun | Silica pigments and elastomer-silica pigment masterbatches and production processes relating thereto |
US4431755A (en) * | 1982-07-16 | 1984-02-14 | Standard Oil Company (Indiana) | Rubber composition comprising phyllosilicate minerals, silanes, and quaternary ammonium salts |
EP0747323A1 (en) * | 1995-06-07 | 1996-12-11 | Amcol International Corporation | Intercalates; exfoliates; process for manufacturing intercalates and exfoliates and composite materials containing same |
EP1193085A2 (en) * | 2000-09-27 | 2002-04-03 | The Goodyear Tire & Rubber Company | Tire with a least one of rubber/cord laminate, sidewall insert and apex of a rubber composition which contains oriented intercalated and/or exfoliated clay reinforcement |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103596773A (en) * | 2011-05-30 | 2014-02-19 | 倍耐力轮胎股份公司 | High performance tyre for vehicle wheels |
Also Published As
Publication number | Publication date |
---|---|
WO2004056586A1 (en) | 2004-07-08 |
AU2003292167A1 (en) | 2004-07-14 |
BR0317231B1 (en) | 2013-04-09 |
DE60326492D1 (en) | 2009-04-16 |
JP2006511386A (en) | 2006-04-06 |
BR0317231A (en) | 2005-11-01 |
ATE424314T1 (en) | 2009-03-15 |
US20060137797A1 (en) | 2006-06-29 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP4504312B2 (en) | High performance tire for wheels | |
RU2304050C2 (en) | Tire for wheels with tread band in form of tread layer and base assembly | |
US20060137797A1 (en) | Tyre for a two-wheeled vehicle | |
EP2714427B1 (en) | High-performance tyre for motor vehicle wheels | |
US20090218026A1 (en) | Tire and Crosslinkable Elastomeric Composition | |
EP2900492B1 (en) | Tire for vehicle wheels | |
US20090194214A1 (en) | Tire and Crosslinkable Elastomeric Composition | |
JP2001171316A (en) | Tire having small rolling resistance for vehicle and its manufacturing method | |
WO2006002672A1 (en) | Studded tire | |
EP1597093B1 (en) | Tyre for two-wheeled vehicles | |
RU2320495C2 (en) | Highly efficient tire for vehicle wheels |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): BW GH GM KE LS MW MZ SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LU MC NL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 2004561204 Country of ref document: JP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2003767722 Country of ref document: EP |
|
ENP | Entry into the national phase |
Ref document number: PI0317231 Country of ref document: BR |
|
WWP | Wipo information: published in national office |
Ref document number: 2003767722 Country of ref document: EP |
|
ENP | Entry into the national phase |
Ref document number: 2006137797 Country of ref document: US Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 10536833 Country of ref document: US |
|
WWP | Wipo information: published in national office |
Ref document number: 10536833 Country of ref document: US |