WO2006090418A1 - Procede et appareil de fabrication de pneumatiques pour roues de vehicule - Google Patents

Procede et appareil de fabrication de pneumatiques pour roues de vehicule Download PDF

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Publication number
WO2006090418A1
WO2006090418A1 PCT/IT2005/000111 IT2005000111W WO2006090418A1 WO 2006090418 A1 WO2006090418 A1 WO 2006090418A1 IT 2005000111 W IT2005000111 W IT 2005000111W WO 2006090418 A1 WO2006090418 A1 WO 2006090418A1
Authority
WO
WIPO (PCT)
Prior art keywords
belt structure
drum
belt
carcass
devices
Prior art date
Application number
PCT/IT2005/000111
Other languages
English (en)
Inventor
Giovanni Pozzati
Claudio Lacagnina
Original Assignee
Pirelli Tyre S.P.A.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pirelli Tyre S.P.A. filed Critical Pirelli Tyre S.P.A.
Priority to PCT/IT2005/000111 priority Critical patent/WO2006090418A1/fr
Priority to EP05719021A priority patent/EP1855874A1/fr
Publication of WO2006090418A1 publication Critical patent/WO2006090418A1/fr

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Classifications

    • 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
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/08—Building tyres
    • B29D30/20—Building tyres by the flat-tyre method, i.e. building on cylindrical drums
    • B29D30/24—Drums
    • B29D30/26—Accessories or details, e.g. membranes, transfer rings
    • B29D30/2607—Devices for transferring annular tyre components during the building-up stage, e.g. from the first stage to the second stage building drum
    • 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
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/08—Building tyres
    • B29D30/20—Building tyres by the flat-tyre method, i.e. building on cylindrical drums
    • 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
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/08—Building tyres
    • B29D30/20—Building tyres by the flat-tyre method, i.e. building on cylindrical drums
    • B29D30/24—Drums
    • B29D30/26—Accessories or details, e.g. membranes, transfer rings
    • B29D2030/2671—Holding the layers, e.g. the webs or the plies, in position onto the drum
    • B29D2030/2678—Holding the layers, e.g. the webs or the plies, in position onto the drum by using magnets
    • 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
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/08—Building tyres
    • B29D30/20—Building tyres by the flat-tyre method, i.e. building on cylindrical drums
    • B29D30/24—Drums
    • B29D30/26—Accessories or details, e.g. membranes, transfer rings
    • B29D2030/2671—Holding the layers, e.g. the webs or the plies, in position onto the drum
    • B29D2030/2692—Holding the layers, e.g. the webs or the plies, in position onto the drum by using suction means, e.g. vacuum producing devices

Definitions

  • the present invention relates to a method of manufacturing pneumatic tyres for vehicle wheels.
  • the invention also relates to an apparatus' for manufacturing pneumatic tyres in accordance with the above mentioned method.
  • Manufacture of a tyre for vehicle wheels generally involves preparation of a carcass structure comprising at least one carcass ply that is formed by circumferentially winding on a so-called “building drum”, at least one semi-finished product comprising textile or metallic reinforcing cords oriented transversely of the longitudinal extension of the article of manufacture itself.
  • annular anchoring structures each usually formed of a substantially, circumferential annular insert to which at least one ' filling insert is applied, at a radially external position.
  • an outer sleeve which . comprises a belt structure with which a tread band applied at a radially external position, is 'coupled.
  • the belt structure comprises a single reinforcing layer of the so-called "zero degree" type, obtained with the aid of at least one continuous elongated element comprising one or more generally metallic parallel cords, that is wound up on the auxiliary drum to form circumferential coils that are suitably distributed in an axial direction.
  • the conformation of the auxiliary drum is of such a nature that the belt layer is given an arched profile with a marked curvature, typical of tyres for motorcycles. A correct maintenance of the geometric features of this profile is a decisive factor as regards functionality of the whole tyre.
  • the tread band Associated with the belt structure formed on the auxiliary drum is the tread band, currently obtained by cutting out a section of suitable length from a semifinished product of elastomeric material previously made in the form of a continuous strip.
  • the strip section constituting the tread band is first wound up at a radially external position on the belt structure supported by the auxiliary drum; then, with the aid of expandable bladders and/or by a rolling operation, the side edges of said section are knocked down radially inwards so that the tread band is shaped according to the curvature profile of the belt structure and correctly adheres to the whole surface extension thereof.
  • the outer sleeve (that after radial knocking down of the edges has taken the shape of a semitorus) made up of the tread band coupled with the belt structure can therefore be picked up from the auxiliary drum by means of an annular transfer device, to be coupled with the carcass sleeve.
  • the outer sleeve is disposed in coaxial relatioship around the carcass sleeve and afterwards the carcass ply is given a toroidal configuration by mutual axial approaching of the tyre beads and simultaneous admission of fluid under pressure to the inside of the carcass sleeve, so as to cause application of the outer sleeve to the tyre carcass structure, at a radially external position.
  • Assembling of the carcass sleeve with the outer sleeve can be carried out on the same drum as used for manufacturing the carcass sleeve, in which case reference is made to "a unistage building process". A building process of this type is described in document US 3,990,931, for example .
  • the Applicant has realised that knocking down of the opposite side edges of the tread band to give the latter the same conformation as the curved profile of the belt structure, can give rise to further structural defects in the finished product.
  • the side portions of the tread band first disposed according to a diameter corresponding to the maximum diameter measurable along the equatorial plane of the tyre, must be brought to adhere to .the portions of the belt structure that, by effect of the curved profile typical of tyres for two-wheeled vehicles, have a remarkably reduced diameter.
  • the corresponding reduction in the circumferential extension ' imposed on the side portions of the tread band can give rise to severe unevennesses in thickness.
  • the Applicant has further found that handling of the semifinished product in the form of a strip designed to constitute the tread band can .involve several problems, such as undesirable structural deformations of the article of manufacture due to unavoidable stresses induced on the latter during the operations of cutting and winding the strip on the belt structure, or also merely due to collapsing of the material by effect of its weight. These structural deformations that can be hardly controlled can easily induce geometric unevennesses in the finished product.
  • the Applicant has also perceived that the times for completing a work cycle on the different parts of a tyre manufacturing apparatus can be optimised if manufacture of the tread band on the belt structure is executed after the belt structure has been associated with the carcass structure.
  • a belt structure comprising only one "zero degree” resistant layer, formed of one or more continuous elements wound up into coils disposed in side by side relationship in the absence of further resistant inserts having a crossed orientation relative to the coils, would tend to collapse as soon as it is removed from the auxiliary drum, since the strengthening effect usually performed by the tread band applied thereto in known processes is lacking.
  • the Applicant has however become aware of the fact that by a suitable structural stabilisation of the belt structure during transfer of same from the auxiliary drum to the carcass structure, also belt structures of weak structural consistency can be handled in an easy and efficient manner, without running the risk of their geometric features being impaired, even in the absence of a tread band and/or further inserts or belt layers formed of crossed cords.
  • the Applicant has found that ' a satisfactory- structural stabilisation can be advantageously achieved by submitting the belt structure to forces oriented in a radially external direction against the annular transfer device, during engagement of the belt structure by the transfer device itself.
  • the present invention relates to a method of manufacturing tyres, comprising the steps of: applying a carcass structure onto a primary drum; preparing a belt structure on an auxiliary drum; engaging the belt structure with a transfer device; submitting the belt structure to forces oriented in a radially external direction towards an abutment surface belonging to the transfer device; disengaging from the auxiliary drum, the belt structure engaged by the transfer device; associating the belt structure with the carcass structure; manufacturing a tread band at a radially external position to said belt structure.
  • said forces are each oriented in a direction passing through a point of tangency between the abutment surface and the tangent plane thereof, at right angles to said tangent plane.
  • said forces are generated through magnetic attraction of the belt structure against said abutment surface, advantageously giving an efficient structural stabilisation to the shape of the belt structure.
  • said forces are generated through suction of the belt structure against said abutment surface.
  • the invention relates to an apparatus for manufacturing tyres, comprising: devices for applying a carcass structure onto a primary drum; devices for preparing a belt structure on an auxiliary drum; a transfer device set to remove the belt structure from the auxiliary drum to position it in coaxial relationship around the carcass structure; stabilisation devices for transmitting forces to the belt structure, which forces are oriented in a radially external direction towards at least one abutment surface belonging to the transfer device; devices for associating the carcass structure with the belt structure carried by the transfer device; devices for manufacturing a tread band at a radially external position to the belt structure.
  • FIG. 1 is a diagrammatic top view of an apparatus for manufacturing tyres in accordance with a first embodiment of the invention
  • - Fig. 2 is a diagrammatic top view of a manufacturing apparatus according to a possible alternative embodiment of the invention
  • - Fig. 3 is a fragmentary diametrical section view showing a device for manufacturing a belt structure being part of the apparatus referred to in Figs. 1 and 2;
  • Fig. 4 shows the device seen in Fig. 3 during formation of a resistant belt layer
  • FIG. 5 is a fragmentary diametrical section view showing an annular transfer device in accordance with a first manufacturing example
  • FIG. 6 is a fragmentary diametrical section view of a transfer device in accordance with a second manufacturing example
  • Fig. 7 diagrammatically shows an operating step in which a tread band is made on the belt structure coupled with a carcass of a tyre being worked.
  • an apparatus for manufacturing tyres for vehicle wheels, set to put into practice a manufacturing method in accordance with the present invention has been generally identified by reference numeral 1.
  • the invention is particularly conceived for manufacturing tyres for two-wheeled vehicles, of the type generally denoted at 2 in Fig. 7.
  • tyres for two-wheeled vehicles are distinguishable for their marked transverse curvature.
  • This transverse curvature is usually defined by the particular value of a so-called curvature ratio "R" between the distance "D” existing between the radially external point of the tread band and the line passing through the opposite lateral extremities of the tread band itself measured on the equatorial plane of the tyre, and the distance "L” measured along the tyre chord between said extremities.
  • the curvature ratio value is generally at least as high as 0.15 and it is usually in the order of about 0.3 as regards rear tyres and even higher, until about 0.45, in the case of front tyres.
  • curvature ratio "Rt” is the ratio between the distance "Dt" existing between a radially external point of the toroidal surface of the drum and the line passing through the laterally opposite extremities of the drum itself measured on the equatorial plane of the drum
  • the curvature ratio value Rt is, as a result of what discussed above, included between about 0.15 and about 0 . 45 .
  • tyre 2 comprises a carcass structure 3 of substantially toroidal conformation, a belt structure 4 circumferentially extending around the carcass structure 3, a tread band 5 applied to the belt structure 4 at a circumferentially external position, and a pair of sidewalls 6 laterally applied to the carcass structure 3 on opposite sides, and each extending from a side edge of the tread band 5 until a region close to a radially internal edge of the carcass structure 3 itself.
  • Each of the sidewalls 6 and the tread band 5 essentially comprises at least one layer of elastoineric material of suitable thickness.
  • elastomeric material it is intended a composition comprising at least one elastomeric polymer and at least one reinforcing filler.
  • this composition further comprises additives such as cross-linking agents and/or plasticizers . Due to the presence of the cross-linking agents, this material can be cross-linked through heating, so as to form the final article of manufacture.
  • the carcass structure 3 comprises a pair of annular anchoring structures 7, integrated into regions usually identified as “beads”, each made up of a substantially circumferential annular insert 8 for example, that is usually called “bead core”, which insert carries an elastomeric filler 9 at a radially external position.
  • the end flaps 10a of one or more carcass plies 10 are turned up around each of the annular anchoring structures, which end flaps 10 comprise textile or metallic cords extending transversely of the circumferential extension of tyre 2, possibly according to a predetermined inclination, from one of the annular anchoring structures 7 to the other.
  • the belt structure 4 can in turn comprise at least one resistant belt layer 11 preferably formed of at least one continuous elongated element 12 comprising one or more cords 13 made up of filament-like elements of textile or metallic material, incorporated into an elastomeric matrix.
  • the continuous elongated element 12 comprises two cords 13.
  • the continuous elongated element 12 is wound around the geometric rotation axis of tyre 2 into circumferential coils 12a axially distributed so as to define the resistant belt layer 11.
  • coils 12a can be disposed axially close to each other and/or axially distributed to a suitable mutual distance. This distance can be constant or variable, with a decreasing rate on moving close to the opposite side edges of the belt structure 4 or in other manner according to need.
  • the resistant belt layer 11 can be applied at a radially external position, to at least one elastomeric base layer 14, possibly filled with fibres or other reinforcing inserts as disclosed in document EP 0718122 for example, in the name of the same Applicant.
  • the above_ described resistant belt layer 11 is applied to the elastomeric base layer 14 in the absence of further layers comprising cords having a crossed orientation relative to the circumferential coils 12a, which further layers are instead usually provided in the belt structure of tyres for motor vehicles.
  • carcass structure 3 individual components of the carcass structure 3, such as in particular the annular anchoring structures 1, carcass plies 10, elastomeric base layer 14 of the belt ' structure 4, and/or possible auxiliary belt layers, can be supplied to apparatus 1 in the form of semi-finished products manufactured in prior working steps, to be suitably assembled with each other.
  • Apparatus 1 is equipped with devices for applying the carcass structure 3 on a primary drum 15. These applying devices preferably comprise a manufacturing station 16, not described in detail because it can be
  • the manufacturing station 16 can comprise devices for associating the sidewalls 6 with the carcass ply or plies 10.
  • transfer devices not shown pick up the carcass structure 3 from the building drum 17 to transfer it onto the primary drum 15, of the type usually referred to as "shaping drum” for example, which is conveniently set to continue building of the tyre according to a manufacturing process of the so-called "two-stage" type in a respective assembling station 18.
  • assembling of the components of the carcass structure 3 can be directly carried out on the primary drum 15 following a building process of the so-called "unistage type".
  • the belt structure 4 is prepared on an auxiliary drum 19 located in a respective auxiliary work station 20.
  • the auxiliary drum 19 to interact with devices for preparing the belt structure 4 which may comprise at least one second feeding line 21 for example, or feeding members of other type terminating at a so-called comb drum 22 designed to contain the auxiliary drum 19 when the latter is in a radially contracted position, as shown in Fig. 3.
  • devices for preparing the belt structure 4 may comprise at least one second feeding line 21 for example, or feeding members of other type terminating at a so-called comb drum 22 designed to contain the auxiliary drum 19 when the latter is in a radially contracted position, as shown in Fig. 3.
  • a semifinished product of elastomeric material in the form of a continuous strip is fed along the second feeding line 21, which semifinished product is then cut into sections of suitable length, concurrently with winding of same on the comb drum 22 to make the elastomeric base layer 14 initially having a cylindrical conformation as seen in Fig. 3.
  • the auxiliary drum 19 is then brought to a radial-expansion condition so that said sectors radially project through respective passages arranged in the comb drum 22, to expand the base layer 14 and give it a conformation according to a cross-section profile of suitable curvature.
  • the radial sectors of the auxiliary drum 19 in the radially expanded condition define, at a radially external position, a forming surface having an arched profile with a curvature ratio Rt included between about 0.15 and about 0.45, in accordance with the transverse curvature of the tyre 2 that is wished to be obtained.
  • the auxiliary drum 19 is disengaged from the comb drum 22 through an axial movement as shown in Fig. 4, to co-operate with winding members for the continuous elongated element 12 designed to make the resistant belt layer 11.
  • These winding members can for example comprise an axially and/or radially movable delivery member to lay the continuous elongated element 12 on the forming surface 19a defined by the sectors of the auxiliary drum 19, while the latter is driven in rotation around its geometric axis.
  • the thus obtained belt structure 4 is adapted to be engaged by an annular transfer device 23 designed to remove the belt structure 4 from the auxiliary drum 19, for engagement of same with the carcass structure 3 set on the primary drum 15.
  • the primary drum 15 and auxiliary drum 19 are provided to be respectively aligned along a guide structure 24 on which translation of the annular transfer device 23 can occur.
  • the annular transfer device 23 is laid in coaxial relationship around the auxiliary drum 19 carrying the belt structure 4-, to engage the latter by means of grip devices comprising a plurality of shaped grip sectors 25 for example, that are circumferentially distributed and radially movable between a rest condition at which they are radially spaced apart from a geometric axis of the annular transfer device, and a work position at which they are moved radially close thereto to engage the belt structure 4.
  • the grip sectors 25 lend themselves ' to act on the belt structure 4 by at least one abutment surface 25a the shape of which matches that of the belt structure 4 itself, according to the transverse curvature profile of the latter.
  • the grip devices comprise a circumferential bladder 26 in engagement with the annular transfer device 23 at a radially internal position.
  • bladder 26 lends itself to be radially expanded from the outside to the inside, between a rest position at which it has an inner diameter greater than the outer diameter of the belt structure 4 formed on the auxiliary drum 19 so as to enable axial insertion and release of the annular transfer device 23 relative to the auxiliary drum 19 carrying the belt structure 4, and a work condition at which., as shown in Fig. 6, it defines an abutment surface conforming in shape to the belt structure 4 and operating against the latter to cause engagement of the same by the annular transfer device 23 itself.
  • said circumferential bladder 26 is anchored to the radially movable grip sectors 25 so as to increase travel in the radial direction and improve the engagement/disengagement operations.
  • the belt structure 4 is advantageously submitted to the action of stabilisation devices 27 that transmit forces directed radially outwardly to said belt, structure 4 and push it against the abutment surface 25a, 26a carried by the annular transfer device 23. Due to the action of these forces the conformation of the belt structure 4 is stabilised, even if the • latter should have a very reduced structural consistency.
  • the stabilisation devices 27 comprise magnetic inserts integrated into the grip sectors 25 or the circumferential bladder 26 at the abutment surface and for example formed with plate-like elements of elastomeric material containing charges consisting of a neodymium-iron-boron dispersion.
  • the stabilisation forces can be generated through suction of the belt structure 4 against the abutment surface 25a, 26a.
  • the stabilisation devices 27 may comprise a suction circuit (not shown) terminating at apertures suitably distributed on the abutment surface 25a, 26a.
  • each of the stabilisation forces F is oriented in a direction passing through a tangency P between the abutment surface 25a, 26a and a tangent plane "t" thereof, at right angles to said plane.
  • each stabilisation force F is oriented perpendicular to the abutment surface 25a,
  • the belt structure 4 can be disengaged from the auxiliary drum 19 and translated to the assembling station 18 without the risk of impairing the geometric and structural features thereof that would give rise to repercussions on the functional features of tyre 2.
  • the belt structure 4 is positioned in coaxial relationship around the primary drum 15 to be associated with the carcass structure 3 set thereon.
  • the carcass structure 3 is shaped into a toroidal configuration through axial mutual approaching of the annular anchoring structures 7 and simultaneous admission of fluid under pressure to the inside of said carcass structure 3 until bringing the carcass ply or plies 10 into contact with the inner surface of the belt structure 4 retained by the annular transfer device 23.
  • the grip sectors 25 or the circumferential bladder 26 are brought back to the rest position, to enable removal of the annular transfer device 23 from the belt structure 4 applied to the carcass structure 3.
  • a rolling step to be performed in any convenient manner, can be carried out on the belt structure - 4 after the step of shaping the carcass structure 3 or concurrently with said step, to obtain a better adhesion against the carcass ply or plies 10.
  • a tread band 5 is subsequently made, at a radially external position to the belt structure 4 already associated with the carcass structure 3.
  • manufacture of the tread band 5 is preferably carried out through spiralling of at least one continuous thread element 29 of elastomeric material.
  • the devices for manufacturing the tread band 5 comprise at least one extruder, an applicator roller or other delivery member 28 that, through an outlet nozzle operating adjacent to the primary drum 15, lends itself to deliver the continuous thread element 29 directly against the belt structure 4, simultaneously with winding of the continuous thread element itself into coils 29a distributed following a predetermined path against the •radially external surface of the belt structure 4.
  • a transverse-movement unit 30 determines a relative transverse motion between the delivery member
  • the continuous thread element 29 fed from the delivery member 28 can advantageously have a flattened section so that it can modulate the thickness of the elastomeric layer being formed by varying the overlapping amount of the contiguous coils 29a and/or orientation of the surface of tyre 2 being worked relative to the cross-section ' profile of the thread element coming from the delivery member 28 itself.
  • the transverse-movement unit 30 comprises a carriage 30a carrying the primary drum 15 and movable along said guide structure 24, in the vicinity of the delivery member 28.
  • the delivery member 28 in turn can be movable in translation along an auxiliary guide extending at right angles to the guide structure 24, to enable the delivery member 28 to move close to and away from the primary drum 15.
  • the delivery member 28 preferably keeps a fixed positioning, while the primary drum 15 is being driven in rotation and suitably moved in a transverse direction by the movement unit 30, so as to cause distribution of the continuous elongated element 12 in such a manner as to form a tread layer of suitable shape and thickness on the belt structure 4.
  • the movement unit 30 carries out translation of the delivery member 28 in a transverse and radial direction relative to the circumferential extension of the belt structure 4, to cause transverse distribution of the coils formed by the continuous thread element 29.
  • the movement unit 30 comprises a pair of orthogonal guides 30b carrying the delivery member 28, so as to enable movement of the latter both in a radial direction close to and away from the primary drum 15, and in a direction parallel to the rotation axis of said primary drum 15.
  • the sidewalls 6 can be carried out in the same manner as described in relation to accomplishment of the tread band 5, using the same delivery member 28 for example, or other specifically dedicated delivery devices.
  • the tread band 5 can be obtained by cutting a section of suitable length from a semifinished product in the form of a continuous strip coming from a respective feed line.
  • the assembled tyre 2 can be removed from the primary drum 15 to be submitted to a subsequent vulcanisation step and/or a step involving other working operations.
  • the present invention enables transfer of the belt structure 4 devoid of the tread band 5 without the risk that, due to the absence of the structural consolidation and stabilisation effect usually carried out by the tread band itself, structural deformations or damages to the belt structure 4 may occur.
  • This risk can also be found when the building features of the belt structure 4 are of such a nature as to make said belt structure very weak or in any case not very resistant, which often occurs in manufacturing tyres for motorcycles wherein the presence of a single resistant layer of the so-called "zero degree" type is -required, i.e. a layer having cords 13 wound up into circumferential coils 12a possibly spaced apart in an axial direction.
  • Transfer of the belt structure 4 in the absence of the tread band 5 advantageously makes it possible to produce the tread band 5 itself through spiralling of a continuous thread element 29, subsequently to coupling of the belt structure 4 with the carcass structure 3, so that the times for carrying out the working cycle on the auxiliary drum 19 are not overloaded.
  • the required time for manufacturing the tread band 5 through spiralling of the continuous thread element 29 on the primary drum 15 is compensated for by elimination or simplification of the rolling operations usually required in the known art in order to try to level the thickness of the tread band 5 obtained from a semifinished product in the form of a continuous strip.
  • the tread band 5 Through spiralling also enables elimination of all drawbacks in terms of workability and production quality connected with working of the semifinished products in the form of a continuous strip and application of the tread bands 5 obtained therefrom following the teachings of the known art.
  • the geometric features of the tread band 5 can be advantageously controlled in a more precise manner so that, for instance, a controlled and constant thickness can be obtained both close to the equatorial plane and close to the shoulders of tyre 2, even during working of particularly soft blends.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tyre Moulding (AREA)

Abstract

Selon l’invention, une structure de carcasse (3) est fabriquée sur un tambour de montage (17) puis transférée sur un tambour primaire (15). Une structure de nappe d’armature (4) comprenant un insert résistant (11) du type 'zéro degré' est simultanément formée sur un tambour auxiliaire (19). Un dispositif de transfert annulaire (23) doté d’inserts magnétiques (27) intégrés dans des secteurs de prise (25) ou dans une poche extensible (26) saisit la structure de nappe d’armature (4) pour la transférer sur le tambour primaire (15) portant la structure de carcasse (3). Les inserts magnétiques (27) stabilisent la structure de nappe d’armature (4) pour éviter l’apparition de déformations structurales en l’absence d’une bande de roulement (5) ou de couches résistantes supplémentaires à cordes croisées. La bande de roulement (5) peut alors être fabriquée par enroulement en spirale d’un élément allongé continu (12) directement sur la structure de nappe d’armature (4) déjà associée à la structure de carcasse (3).
PCT/IT2005/000111 2005-02-28 2005-02-28 Procede et appareil de fabrication de pneumatiques pour roues de vehicule WO2006090418A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/IT2005/000111 WO2006090418A1 (fr) 2005-02-28 2005-02-28 Procede et appareil de fabrication de pneumatiques pour roues de vehicule
EP05719021A EP1855874A1 (fr) 2005-02-28 2005-02-28 Procede et appareil de fabrication de pneumatiques pour roues de vehicule

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IT2005/000111 WO2006090418A1 (fr) 2005-02-28 2005-02-28 Procede et appareil de fabrication de pneumatiques pour roues de vehicule

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WO2006090418A1 true WO2006090418A1 (fr) 2006-08-31

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102555251A (zh) * 2010-12-10 2012-07-11 固特异轮胎和橡胶公司 轮胎分离装置
US20220168982A1 (en) * 2015-12-28 2022-06-02 Pirelli Tyre S.P.A. Plant for building tyres

Citations (13)

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GB997253A (en) * 1961-06-15 1965-07-07 Dunlop Rubber Co Improvements in or relating to the manufacture of pneumatic tyres
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GB1414019A (en) * 1972-06-28 1975-11-12 Goodyear Tire & Rubber Pnejmatic tyre building apparatus and method
US3990931A (en) 1972-07-06 1976-11-09 Uniroyal, S.A. Tire building apparatus and method
US4288265A (en) * 1978-10-25 1981-09-08 Industrie Pirelli S.P.A. Process and apparatus for manufacturing radial tires
US4528052A (en) * 1982-02-17 1985-07-09 Toyo Tire & Rubber Co., Ltd. Process for making a radial tire
EP0613757A1 (fr) 1993-02-20 1994-09-07 Firma Gerhard Häberle Dispositif de serrage pour pièces à travailler
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