EP4463315A1 - Verfahren zur herstellung von fahrzeugreifen - Google Patents
Verfahren zur herstellung von fahrzeugreifenInfo
- Publication number
- EP4463315A1 EP4463315A1 EP22826348.9A EP22826348A EP4463315A1 EP 4463315 A1 EP4463315 A1 EP 4463315A1 EP 22826348 A EP22826348 A EP 22826348A EP 4463315 A1 EP4463315 A1 EP 4463315A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- carcass
- ply
- reinforcements
- cord angle
- tire
- Prior art date
- Legal status (The legal status 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 status listed.)
- Pending
Links
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
-
- 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
- B29D2030/086—Building the tyre carcass by combining two or more sub-assemblies, e.g. two half-carcasses
Definitions
- the invention relates to a method for producing a vehicle tire blank, a method based thereon for producing a vehicle tire and a device for curving a carcass against a tread package for use in corresponding methods.
- a pneumatic vehicle tire is also disclosed.
- Car tires for example, often consist of at least one inner layer that seals the interior airtight, one or two carcass plies, bead cores with bead flaps, side walls, two or more steel belt plies, a textile bandage in the circumferential direction and a tread.
- the so-called radial tires are nowadays of particular importance.
- the reinforcements in the carcass ply run essentially transversely to the circumferential direction over the entire width of the carcass ply, so that the cord angle of these carcass reinforcements is essentially 90°.
- the carcass cord angle can deviate slightly from the ideal 90°, with the reinforcements in the two carcass plies then regularly having an opposing gradient.
- the object of the present invention to specify a method for the production of vehicle tire blanks, with which pneumatic vehicle tires, which have a partially angled Carcass, ie a carcass in which the carcass reinforcements in the central area have a carcass cord angle deviating from 90°, can be produced in a time- and cost-efficient manner. It was an important object of the present invention that the susceptibility of the method to manufacturing errors should be reduced and that the desired carcass cord angle below the tread should be able to be set reliably. In this respect, it was an additional requirement that the method to be specified should desirably be able to be carried out with materials and semi-finished products that can be manufactured with devices that are also used to provide the materials for conventional radial tires.
- the pneumatic vehicle tires to be produced using the method to be specified should have excellent mechanical properties, and in particular when only one carcass ply is used, the stability achieved below the tread should be sufficient to reduce the number of To be able to advantageously reduce tire carcass and the tread used additional layers.
- the invention relates to a method for producing a green vehicle tire, comprising the method steps: a) arranging a carcass ply on a tire building drum, the carcass ply comprising a multiplicity of carcass reinforcements embedded in a vulcanizable rubber mixture, the carcass reinforcements having a carcass cord angle in the range of 30 ° to 85°, b) arranging one bead core each on the two side areas of the carcass ply and turning over the outer areas of the carcass ply around the respective bead core to produce ply turns and the associated tire beads, c) arranging a barrier ply on a partial area of the carcass ply to obtain a carcass, the barrier ply comprising a plurality of barrier ply strength carriers embedded in a vulcanizable rubber mixture, which have a barrier ply cord angle in the range of 30° to 85° and which enclose an angle pointing in the circumferential direction with the carcass strength members, which is the sum of
- the method according to the invention uses a tire building drum to carry it out.
- Tire building drums are generally known to those skilled in the art and can take a variety of forms.
- a carcass ply is placed on the surface of the tire building drum, which placement may also be over any other plies previously placed on the tire building drum.
- a relevant reference direction that the person skilled in the art regularly deals with when building pneumatic vehicle tires is the circumferential direction of the later pneumatic vehicle tire or the components used, which regularly corresponds to the circumferential direction of the tire building drum.
- this is the respective point at each point on the circumference Circular tangent that includes a right angle with the radial direction, ie the connection between the respective point and the center of the tire.
- the rubber reinforcements of the carcass layers run essentially radially. This means that the rubberized reinforcements enclose an angle of approximately 90° with the circumferential direction across the entire width of the carcass, transversely to the circumferential direction of the pneumatic vehicle tire.
- each rubberized reinforcement is essentially in the same circular section when the pneumatic vehicle tire is viewed from above.
- the corresponding size is also referred to by those skilled in the art as the so-called cord angle.
- the cord angle ie the relative angle of the reinforcement to the circumferential direction.
- the smaller of the two angles formed with the circumferential direction is taken as the cord angle and not the larger, complementary angle (i.e. with a cord angle of 70°, the complementary angle of 110° given).
- the carcass ply comprises a multiplicity of carcass reinforcements which are not ideally arranged radially, but rather have a carcass cord angle in relation to the circumferential direction which is significantly below 90°. This means that the carcass reinforcements run diagonally to the tire building drum, so to speak.
- the bead cores are then in the usual way arranged on the side areas of the carcass ply and the outer areas of the carcass are beaten around them to produce the tire beads, which later for the contact with the Tire rim are provided.
- the turned-up areas of the carcass ply are referred to as ply turn-ups.
- a method according to the invention is preferred, in which at least one of the bead cores, preferably both bead cores, comprises a metallic core, wherein particularly preferably at least one of the bead cores, very particularly preferably both bead cores, comprise a core flap made of a vulcanizable rubber mixture, which adjoins the metallic cores .
- the turning over of the side areas of the carcass ply means that a lattice-shaped superimposition of the reinforcements is automatically generated in the overlapping area of the carcass ply with the ply turn-up, since the turning over inverts the slope of the reinforcements in the ply turn-up.
- automatically reinforced tire beads are obtained, so that the use of additional textile bead reinforcements can advantageously be dispensed with.
- the further special feature of the method according to the invention is that a so-called barrier layer is arranged on the carcass ply, with a corresponding barrier layer usually being arranged directly on the carcass ply.
- the barrier layer is only placed on a partial area of the carcass layer, usually the central part of the carcass layer, which lies below the tread in the later vehicle tire.
- a method according to the invention is preferred, wherein the sections form the flanks of the green vehicle tire between the tire beads and the barrier layer.
- the barrier layer like the carcass layer, includes a large number of reinforcements, which themselves have a cord angle that deviates from the ideal radial alignment. According to the invention, however, the barrier layer strength members are at least partially inverted in comparison to the carcass strength members, which means that their slope has a different sign.
- the carcass reinforcements and the barrier ply reinforcements together enclose an angle which is the sum of both cord angles, i. H. of the carcass cord angle and the barrier cord angle. In accordance with the understanding of those skilled in the art, this angle opens towards the circumferential direction so that it points circumferentially.
- the cord angles of the reinforcement members involved are correspondingly on different sides of the vector that describes the circumferential direction. This means that the barrier ply reinforcements and the carcass reinforcements in the carcass ply form a lattice structure when viewed from above.
- Process steps b) and c) can be carried out in any order.
- the person skilled in the art understands to this extent that it is not relevant for the method according to the invention whether the bead cores or the barrier layer are applied first.
- a method is practicable in which, however, the bead cores are first applied and the layer turns are produced.
- the barrier layer can then be placed particularly precisely between the layer folds.
- a carcass which advantageously has a lattice-like overlay of the reinforcements in the bead regions on both sides.
- This structure fixes the reinforcements in the carcass ply in the area of the tire bead.
- the resulting carcass has a grid-like superimposition of the reinforcements in a partial area between the ply turns through the applied barrier layer and the barrier layer reinforcements running in the opposite direction to the carcass reinforcements, through which the carcass reinforcements are fixed in the carcass ply.
- the carcass reinforcements are not fixed by opposing reinforcements.
- the cambering of the carcass and the expansion of the carcass in the radially outward direction leads to an alignment of the carcass reinforcements in the sections between the tire beads and the barrier ply, which, thanks to the permitted relative movement of the tire beads, strive to follow the forces exerted during the cambering as best as possible and out of the angled basic arrangement are converted into a radial orientation, so that the carcass cord angle can change in these sections.
- the alignment of the carcass reinforcements in those sections not fixed by a lattice structure of the reinforcements causes the carcass cord angle to approach the ideal radial alignment, whereas a change in the carcass cord angles in the areas fixed by the lattice-shaped superimposition of the reinforcements is prevented.
- the inventors of the present invention have succeeded in identifying particularly favorable cord angles for the carcass reinforcements and the barrier layer reinforcements, with which particularly pronounced lattice structures of the overlap can be produced, resulting in particularly favorable mechanical properties of the later pneumatic vehicle tires.
- corresponding cord angles are often particularly difficult to produce using conventional methods, so that the advantages of the method according to the invention are particularly evident.
- a method according to the invention is preferred in which the carcass reinforcements have a carcass cord angle in relation to the circumferential direction in the range from 45° to 80°, preferably in the range from 60° to 75°, particularly preferably in the range from 68° to 72°, and/or wherein the barrier ply strength members have a barrier ply cord angle in the range from 45° to 80°, preferably in the range from 60° to 75°, particularly preferably in the range from 68° to 72°, relative to the circumferential direction.
- the cord angles of the various reinforcements are in principle independent of one another, although combinations of the various preferred ranges are in turn particularly preferred.
- cord angles of the various reinforcements in the carcass ply and the barrier ply are as similar as possible. This has proven to be an efficient method, especially when using identical reinforcements, in particular textile reinforcements, to create a lattice structure that is as uniform as possible in the area below the tread, which results in good rigidity and particularly uniform properties in the pneumatic vehicle tire to be produced later.
- a substantially identical cord angle also makes it possible to particularly reliably prevent an unwanted alignment of the carcass reinforcements in the area covered by the barrier layer when the carcass is inverted when the carcass is inverted.
- corresponding versions of the method can use a barrier layer that can be manufactured particularly easily from the composite material that is also used for the carcass layer, since the corresponding material is only inverted, ie with an opposite orientation the reinforcement must be placed.
- a method according to the invention is therefore preferred, in which the locking layer cord angle of the locking layer strength carrier differs by less than 15°, preferably less than 10°, particularly preferably less than 5°, very particularly preferably less than 2°, from the carcass cord angle, the locking layer cord angle and the carcass cord angle are preferably identical.
- the inventors see a scenario in which different reinforcements are used in the various layers as the most relevant alternative to the embodiment described above, namely textile reinforcements on the one hand and metal reinforcements in the other layer.
- a different orientation of the reinforcements in the different layers advantageously allows to adjust the compatibility between the layers and thus the mechanical properties of the layers despite the to match different reinforcements in a targeted manner.
- a method according to the invention is therefore preferred, in which the carcass reinforcements or the barrier layer reinforcements are metallic reinforcements and the other reinforcements are textile reinforcements, the barrier ply cord angle of the barrier ply reinforcements deviating by more than 5°, preferably more than 10°, particularly preferably more than 15°, from carcass cord angle differs.
- a method according to the invention is preferred in this respect, in which the cambering is carried out in such a way that the carcass cord angle of the carcass strength carriers in the sections between the tire beads and the barrier layer is 86° or more, preferably 88° or more, particularly preferably 89° or more, very particularly preferably substantially increased to 90°. It can be seen as a great advantage of the method according to the invention that this can be carried out very easily with a free relative movement of the tire beads, for example by sliding the tire beads in the receptacles provided for this purpose, and the free adjustment of the carcass cord angles in the flank areas over the entire Scope can be performed evenly and, with a sufficient height of the tread package, substantially completely up to a radial alignment.
- the process according to the invention can be carried out without any special outlay on equipment. Accordingly, a method according to the invention is preferred, in which the relative movement of the tire beads in the circumferential direction during crowning is not limited by additional measures, so that during crowning the carcass cord angle of the carcass reinforcements can adjust freely in the sections between the tire beads and the barrier layer.
- the relative movement of the tire beads during curving is limited by additional measures
- additional measures denoting any measures that do not involve the positioning of the tread package above the tire carcass to be curtailed acts.
- a method according to the invention is therefore preferred, in which the relative movement of the tire beads in the circumferential direction during the cambering is limited by additional measures, so that during the cambering a carcass cord angle of the carcass reinforcements in the sections between the tire beads and the locking layer results that differs from that of the unhindered setting .
- the relative movement of the tire beads is limited by additional measures in such a way that a predetermined carcass cord angle is achieved in the lateral area of the pneumatic vehicle tire, for example by suitable Stopper elements in the receptacle of the tire beads and/or a specifically coordinated contact pressure prevent a completely free setting of the carcass strength carriers, with a rotation of the fixing device of the tire beads specifically controlled for setting the predetermined carcass cord angle also being an option.
- a method according to the invention is preferred, in which the relative movement of the tire beads in the circumferential direction during crowning is limited by additional measures, so that during crowning a predetermined carcass cord angle of the carcass reinforcements in the sections between the tire beads and the locking layer results, which is greater than the carcass cord angle of the Carcass reinforcement in the carcass ply.
- These preferred methods are particularly suitable for producing pneumatic vehicle tires that have an angled carcass below the tread strip, the sidewall areas of which have a different cord angle, but should not have an ideal radial orientation themselves.
- the inventors have succeeded in identifying particularly advantageous embodiments with which the relative movement of the tire beads in the circumferential direction to be provided in the method according to the invention can be made possible.
- a targeted control by rotation of the fixing device is preferred, since this enables a particularly precise setting of the carcass cord angles in the side sections.
- a method according to the invention is therefore preferred, in which the relative movement of the tire beads in the circumferential direction during crowning is made possible by a fixing device for the tire beads set up for this purpose, the fixing device preferably having an adapted expansion diameter of the clamp and/or having a reduced clamping force, and/or the fixation device has an adjustable expansion diameter and/or an adjustable clamping force, and/or wherein the fixing device comprises a low-friction surface, for example by means of a lubrication or another coating, and/or wherein the fixing device is designed to penetrate with the tire beads fixed in the fixing device Rotation of the fixing device to perform a relative movement in the circumferential direction relative to the tread package.
- the method according to the invention can be carried out particularly efficiently if the carcass comprises only one carcass ply.
- An additional carcass ply increases, at least potentially, the resistance that the reinforcements in the side sections oppose to alignment during cambering. This is especially true when the carcass plies in turn have different cord angles.
- a method according to the invention is preferred, in which the carcass comprises precisely one carcass ply or in which all carcass plies have a carcass cord angle of the carcass reinforcements which varies by less than 10°, preferably by less than 5°, particularly preferably less than 2°, very particularly preferably less than 1°, from the mean carcass cord angle of the carcass reinforcing members.
- a method according to the invention is possible, in which case the barrier layer is arranged radially on the outside or radially on the inside of the carcass layer becomes. In the case of placement on the radially inner side of the carcass ply, placement is accomplished by placing the barrier ply on the tire building drum before placing the carcass ply thereon. However, a method according to the invention is explicitly preferred, in which the barrier layer is arranged radially on the outside of the carcass layer.
- the advantageous automatic alignment of the reinforcements in the side sections between the bead area and the barrier layer is more difficult to implement if a lattice structure of the reinforcements is also produced in these side sections, since this can at least partially counteract an alignment of the reinforcements and thus greater effort would be required.
- the tire inner layer used in many cases does not include any reinforcements, especially not in the areas that lie below the sections that are provided for aligning the carcass reinforcements during cambering.
- a method according to the invention is preferred, wherein the carcass ply is arranged in method step a) on the outside in the radial direction on an inner tire layer, wherein the inner tire layer preferably does not comprise any reinforcements.
- the method according to the invention is flexible with regard to the requirements placed on the vulcanizable rubber mixtures used and that customary materials can be used.
- a method according to the invention is preferred in which the vulcanizable rubber mixture of the carcass ply and/or the barrier ply comprises at least one diene rubber and at least one filler.
- the method according to the invention can advantageously be carried out essentially with all industrially relevant reinforcements.
- a method according to the invention is preferred in this respect, in which the carcass reinforcements and/or the barrier layer reinforcements, preferably all Reinforcements are selected from the group consisting of textile reinforcements and metallic reinforcements, preferably textile reinforcements, the textile reinforcements particularly preferably comprising one or more materials selected from the group consisting of aramid, polyethylene terephthalate, polyetherketone, polyketone, polyethylene naphthalate, rayon , Viscose, carbon fibers, natural fibers, glass fibers and PBO (poly(p-phenylene-2,6-benzobisoxazole)) are preferably selected from the group consisting of aramid and polyethylene terephthalate.
- the inventors of the present invention have succeeded in identifying geometric arrangements for the carcass ply or barrier ply and the reinforcements processed therein, with which the method according to the invention can be carried out particularly efficiently and which have excellent processing properties in the method according to the invention.
- a method according to the invention is preferred in which more than 90%, preferably more than 95%, particularly preferably more than 98% of the carcass reinforcements, very particularly preferably all of them Carcass reinforcements, have a carcass cord angle which differs by less than 10°, preferably less than 5°, more preferably less than 2°, most preferably less than 1°, from the average carcass cord angle of the carcass reinforcements, and/or wherein more than 90 %, preferably more than 95%, more preferably more than 98% of the barrier ply strength members, most preferably all the barrier ply strength members, have a barrier ply cord angle that changes by less than 10°, preferably by less than 5°, more preferably by less than 2° more preferably less than 1°, differs from the average barrier ply cord angle of the barrier ply strength members.
- a method according to the invention is also preferred, in which more than 90%, preferably more than 95%, particularly preferably more than 98% of the carcass reinforcements, very particularly preferably all carcass reinforcements, have the same sign of the slope, and/or in which more than 90% preferably more than 95%, particularly preferably more than 98% of the barrier layer strength carriers, very particularly preferably all the barrier layer strength carriers, have the same sign of the slope.
- the carcass ply comprises exactly one layer of carcass reinforcements, wherein the carcass reinforcements in the carcass ply are preferably arranged essentially parallel to one another, and/or wherein the barrier ply comprises exactly one layer of barrier ply reinforcements, the barrier ply reinforcements in the barrier ply are preferably arranged essentially parallel to one another.
- a method according to the invention is relevant for the majority of cases, in which the carcass reinforcements have the carcass cord angle essentially over the entire width of the carcass ply and/or the barrier ply reinforcements have the barrier ply cord angle essentially over the entire width of the barrier ply.
- the carcass reinforcements are automatically inverted in the bead regions when the carcass ply is turned over with the inclined reinforcements. With a view to optimal stabilization in the bead areas, it has proven to be advantageous if the turning takes place in such a way that the resulting ply cord angle and the carcass cord angle are essentially identical and accordingly only differ in the sign of the pitch.
- the turning over in method step b) takes place in such a way that the carcass reinforcements in the ply turn-up have a ply cord angle which differs from the carcass cord angle by less than 10°, preferably less than 5°, particularly preferably less than 2° wherein the ply cord angle and the carcass cord angle are preferably identical, and that the carcass strength members in the ply turn-up enclose a circumferential angle with the carcass strength members of the underlying carcass ply which is the sum of the carcass cord angle and the ply cord angle.
- the ideal inversion proposed above with a view to the grid-like superimposition in the bead area is also preferred for the alignment of the barrier layer to the carcass layer.
- a method according to the invention is therefore preferred, in which the progression of the barrier layer reinforcements and/or the progression of the carcass reinforcements in the ply turn-up can be imaged in the top view by mirroring the progression of the carcass reinforcements in the carcass ply in the circumferential direction, and/or wherein the gradient of the barrier layer reinforcements and the Pitch of the carcass strength members have opposite signs along the transverse direction.
- the barrier plies in order to obtain a pneumatic vehicle tire with properties that are as uniform as possible, the barrier plies are placed in this way should lie as centrally as possible between the ply turns in the final green vehicle tyre.
- the person skilled in the art also readily recognizes that in the carcass produced in the method according to the invention there are sections between the tire beads and the barrier ply in which the carcass cord angle of the carcass reinforcements should change during cambering, as defined above. To this extent, the inventors of the present invention have succeeded in specifying particularly favorable width ranges for the area of the carcass ply covered by the barrier ply.
- a method according to the invention is preferred in this respect, in which the barrier layer is arranged essentially in the middle between the layer folds, and/or in which the barrier layer has a width in the range from 20 to 80%, preferably 30 to 70%, particularly preferably 40 to 60% , equal to the width of the area between the ply envelopes.
- the inventors have identified particularly suitable thicknesses for the carcass ply and the barrier ply, which enable an efficient process control. Namely, a method according to the invention is preferred, in which the carcass ply has a thickness in the radial direction in the range from 0.8 to 2.0 mm, preferably in the range from 0.9 to 1.2 mm, and/or in which the barrier ply has a thickness in the radial direction direction has a thickness in the range from 0.6 to 2.0 mm, preferably in the range from 0.9 to 1.5 mm,
- the tread assembly comprises one or more, preferably one or two, belt layers comprises, wherein the belt layers comprise a multiplicity of belt reinforcements embedded in a vulcanizable rubber mixture, wherein the belt reinforcements are selected from the group consisting of textile and metallic reinforcements, preferably metallic reinforcements.
- the tread assembly comprises a bandage, for example a wound bandage, the bandage preferably comprising a textile fabric embedded in a vulcanizable rubber mixture.
- the tread assembly comprises a tread, wherein the tread preferably has a profile on the radially outer surface, and/or wherein the tread is preferably applied to the components of the tread assembly by strip winding.
- the method according to the invention makes it possible to produce vehicle tire blanks that result in vehicle tires that have excellent mechanical properties even without the use of such reinforcing layers.
- a method according to the invention is preferred, in which the tread assembly does not comprise any belt layers and/or bandages, preferably no belt layers and no bandages, with the barrier layer strength carriers being used here are particularly preferably selected from the group consisting of metallic reinforcements, in particular made of steel.
- the inventors propose that in method step b) a partial expansion of the tire building drum can take place in the radially outer direction in order to preform the carcass layer arranged thereon.
- a method according to the invention is therefore preferred, in which the tire building drum is expanded in a central region in method step b) in order to preform the carcass ply and to facilitate the arrangement of the bead cores and the turning over.
- sidewalls can optionally be applied, which will mostly be done on the sections of the tire carcass that lie between the tire beads and the barrier ply. In principle, this can be done at any time in the method according to the invention. However, if the application of the sidewalls takes place before the step of carcass curving, it is explicitly preferred that the sidewalls themselves do not comprise any reinforcement in order not to oppose any unnecessary additional resistance to the alignment of the carcass reinforcements in the side sections during curving. With a view to the most unimpeded alignment of the carcass cord angles in the side sections, however, it is preferred in the majority of cases if the side walls are applied only after the tire carcass has been cambered.
- a method according to the invention is preferred, wherein in method step a), b) or c) sidewalls are also arranged on the carcass ply, the sidewalls preferably being arranged in such a way that they lie at least partially in the sections between the tire beads and the barrier ply in the green vehicle tire , wherein the side walls preferably do not comprise any reinforcements, and/or wherein side walls are also arranged on the carcass in method step d), the side walls preferably being arranged in such a way that they lie at least partially in the sections between the tire beads and the barrier layer in the green vehicle tire, the side walls are preferably applied by applying a strip or by turning them up with a balloon.
- additional padding strips can also be arranged in the carcass in the method according to the invention. Accordingly, a method according to the invention is preferred, wherein additional padding strips are arranged on the carcass.
- the vehicle tire blank can be converted into a vehicle tire using vulcanization methods known from the prior art, with the person skilled in the art freely adjusting the parameters used for vulcanization to the materials used, in particular the vulcanizable rubber mixtures used.
- the invention also relates to a method for producing a vehicle tire, comprising the method steps of the method according to the invention Production of a vehicle tire blank, and also the method step: e) vulcanizing the vehicle tire blank to obtain a vehicle tire.
- a method according to the invention is preferred in which the pneumatic vehicle tire is a passenger car tire.
- the invention also relates to a vehicle tire produced or producible with the method according to the invention for producing a vehicle tire.
- the device which enables the relative movement of the tire beads in the circumferential direction when the carcass is cambered against a tread package is also related to the invention.
- this can be achieved in particular by low-friction surfaces in the receptacles of the fixing device for the tire beads, with a particularly preferred embodiment being that the fixing device is set up to fix the tire beads in principle and a relative movement through an active rotation of the fixing device to perform in the circumferential direction, which is particularly preferred in view of the high degree of control atedness of this method.
- the invention thus finally relates to a device for cambering a carcass against a tread package, for use in a method according to the invention, comprising a fixing device for the tire beads of the carcass, which is set up to enable a relative movement of the tire beads in the circumferential direction during cambering, the Fixation device has a low-friction surface, the surface preferably having a coating with a low-friction plastic, particularly preferably polytetrafluoroethylene, and/or wherein the fixing device is set up to perform a relative movement in the circumferential direction relative to the tread assembly with the tire beads fixed in the fixing device by rotating the fixing device.
- FIG. 1 shows a schematic representation of a first set of partial steps of the method according to the invention in a preferred embodiment
- FIG. 2 shows a schematic representation of a second set of partial steps of the method according to the invention in a preferred embodiment
- FIG. 3 shows a schematic visualization of the orientation of the reinforcements when carrying out the method according to the invention at a first point in time
- FIG. 5 shows a schematic visualization of the orientation of the reinforcements in a plan view through an exemplary pneumatic vehicle tire.
- FIG. 1 shows a schematic representation of the first partial steps of the method according to the invention in a preferred embodiment.
- a tire building drum 12 is provided, on the central area of which a tire inner layer 26 is initially arranged.
- the carcass ply 10 is placed on the tire building drum 12 .
- the carcass ply 10 comprises a plurality of carcass strength members 14a, 14b, 14c, 14d embedded in a vulcanizable rubber compound, which are arranged in a single layer of carcass strength members 14a -14d parallel to one another and over the entire width of the carcass ply 10 with the circumferential direction include a carcass cord angle of 70°.
- FIG. 1 a slight expansion of a central part of the tire building drum 12 takes place, through which the tire inner layer 26 and the carcass ply 10 arranged above it are preformed.
- This preforming facilitates the arrangement of the bead cores 16a, 16b in the side areas of the carcass ply 10.
- the side areas of the carcass ply 10 are then wrapped around the respective bead core 16a, 16b in order to form the tire beads by the ply turns 18a, 18b produced.
- FIG. 2 now shows how, starting from this structure, a barrier layer 20 is arranged on the radially outer side of the carcass layer 10 .
- the barrier layer 20 itself comprises a multiplicity of barrier layer strength carriers 22a, 22b, 22c, 22d embedded in a vulcanizable rubber mixture, which also have a cord angle of 70° in the example shown. Due to the opposite orientation of the barrier layer reinforcements 22a - 22d to the carcass reinforcements 14a - 14d, a lattice-like superimposition of the reinforcements, i.e. a lattice structure, is obtained in which the reinforcements of both layers enclose an angle pointing in the circumferential direction, which is the sum of the carcass cord angles of 70° each has an angle of 140°.
- the carcass 30 obtained in this way is then cambered against a tread package 24, as is shown in the two lower illustrations 2 is shown.
- the crowning takes place in such a way that the tire beads can run freely in the fixing device 28a, 28b, the holders of which are shown schematically, such that a relative movement of the tire beads in the circumferential direction, ie relative to the tread package 24 or the blocking layer 20, is possible.
- the carcass cord angle of the carcass reinforcements can change in the sections between the tire beads and the barrier layer 20 and tends towards a carcass cord angle of about 90° in the side sections as the carcass 30 curves.
- the bead cores 16a, 16b each comprise a metal core and a core flap made of a vulcanizable rubber mixture, which can be converted into a particularly stiff rubber material by vulcanization.
- a metal core and a core flap made of a vulcanizable rubber mixture, which can be converted into a particularly stiff rubber material by vulcanization.
- both the carcass reinforcements 14a-14d and the barrier layer reinforcements 22a-22d are designed as textile reinforcements.
- the barrier ply 20 is positioned substantially centrally between the ply folds 18a, 18b and has a width that is approximately 50% of the width of the area between the ply folds 18a, 18b.
- both the carcass ply 10 and the barrier ply 20 have an average thickness of about 1.0 mm.
- the tread package 24 comprises a belt layer with a multiplicity of metallic belt reinforcements embedded in a vulcanizable rubber mixture and, as a bandage, a textile fabric embedded in a vulcanizable rubber mixture (each without a reference number).
- 3 and 4 visualize the orientation of the carcass reinforcements 14a-14d in the method according to the invention.
- 3 shows a snapshot while the carcass 30 is being cambered, but which has not yet been brought into the end position.
- a carcass strength member 14a is shown along with a barrier ply strength member 22a, both having a cord angle of 70° each and together subtending a corresponding circumferential angle of 140°.
- the central white arrow indicates that the carcass 30 is subjected to a force pointing radially outwards during cambering and the area covered by the barrier layer 20 is thereby lifted.
- the two white arrows in the edge area indicate that this force, which occurs during crowning, results in an alignment of the reinforcements and an orientation along the radial direction.
- the final state of this expansion during cambering is shown in FIG. 4, in which an angle of 90° is set in the side areas without changing the carcass cord angle, which deviates from 90°, in the area below the barrier layer 20.
- FIG. 5 shows a schematic visualization of the orientation of the reinforcements in a plan view of the layers and thus helps to understand the orientation and angles that occur. Shown are four mutually parallel reinforcements, the reinforcements of the carcass ply, ie the carcass reinforcements 14a - 14d, in the resulting green vehicle tire in the area covered by the barrier layer 20 (here indicated by a dashed square) having a carcass cord angle deviating from 90°. 5 clearly shows how the carcass reinforcements 14a-14d and the barrier layer reinforcements 22a-22d form a lattice-like structure and enclose the angle a with one another in the circumferential direction. This Angle a is the sum of the carcass cord angle and the
- Locking layer cord angle which are substantially equal in the example shown.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tires In General (AREA)
- Tyre Moulding (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102022200358.6A DE102022200358A1 (de) | 2022-01-14 | 2022-01-14 | Verfahren zur Herstellung von Fahrzeugreifen |
| PCT/DE2022/200286 WO2023134817A1 (de) | 2022-01-14 | 2022-12-02 | Verfahren zur herstellung von fahrzeugreifen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4463315A1 true EP4463315A1 (de) | 2024-11-20 |
Family
ID=84537855
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP22826348.9A Pending EP4463315A1 (de) | 2022-01-14 | 2022-12-02 | Verfahren zur herstellung von fahrzeugreifen |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4463315A1 (de) |
| DE (1) | DE102022200358A1 (de) |
| WO (1) | WO2023134817A1 (de) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3865669A (en) | 1973-01-08 | 1975-02-11 | Uniroyal Inc | Expansible and contractible transfer ring |
| FR2797213A1 (fr) | 1999-08-02 | 2001-02-09 | Michelin Soc Tech | Procede de fabrication d'un pneumatique avec preconformation d'une nappe de carcasse radiale pour rendre obliques les cables de la partie centrale |
| US20060027310A1 (en) | 2004-08-02 | 2006-02-09 | Michelin Recherche Et Technique S.A. | Shaping drum having rotary under-heel gripping means |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19507486C2 (de) * | 1995-03-03 | 1998-08-06 | Continental Ag | Verfahren zur Herstellung eines Reifens |
| JP4420504B2 (ja) * | 2000-01-13 | 2010-02-24 | 株式会社ブリヂストン | 空気入りタイヤ |
| CN110435360A (zh) * | 2013-03-06 | 2019-11-12 | 倍耐力轮胎股份公司 | 用于车辆车轮的轮胎 |
-
2022
- 2022-01-14 DE DE102022200358.6A patent/DE102022200358A1/de active Pending
- 2022-12-02 EP EP22826348.9A patent/EP4463315A1/de active Pending
- 2022-12-02 WO PCT/DE2022/200286 patent/WO2023134817A1/de not_active Ceased
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3865669A (en) | 1973-01-08 | 1975-02-11 | Uniroyal Inc | Expansible and contractible transfer ring |
| FR2797213A1 (fr) | 1999-08-02 | 2001-02-09 | Michelin Soc Tech | Procede de fabrication d'un pneumatique avec preconformation d'une nappe de carcasse radiale pour rendre obliques les cables de la partie centrale |
| US20060027310A1 (en) | 2004-08-02 | 2006-02-09 | Michelin Recherche Et Technique S.A. | Shaping drum having rotary under-heel gripping means |
Non-Patent Citations (1)
| Title |
|---|
| See also references of WO2023134817A1 |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102022200358A1 (de) | 2023-07-20 |
| WO2023134817A1 (de) | 2023-07-20 |
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