Vehicle pneumatic tires

Abstract

The invention relates to a vehicle pneumatic tire comprising a tread, a carcass (2) with a carcass ply (2a) with carcass reinforcement carriers and a coil bandage with a coil bandage reinforcement carrier, wherein each carcass ply (2a) runs between bead areas (4), wherein a bead core (5) is arranged in each bead area (4) and each carcass ply (2a) is folded over the bead cores (5) so that a carcass fold (2f) is formed. According to the invention, it is provided that - in the carcass (2) a carcass reinforcement carrier (2b) made of a metallic material runs, - the bead core (5) has a teardrop-shaped cross-section and no apex is arranged radially above the bead core (5) between the bead core (5) and the carcass layer (2a), - the carcass high-profile cut (2f) runs radially below the sidewall (3), and - the vehicle tire has a load index in the range of 71 to 126.

Description

[0001] The invention relates to a vehicle pneumatic tire for passenger cars and / or light commercial vehicles according to the preamble of claim 1.

[0002] Due to the large number of vehicle tires used worldwide, the amount of used tires accumulating over time is a growing environmental problem. Burning, burying, or dumping them are rightly not sustainable disposal methods, especially since used tires themselves are now considered a valuable resource.

[0003] Recycling used tires is not unknown, but it is a complex and costly process that currently achieves little to no complete recovery. One well-known method is thermal decomposition, also called pyrolysis, used to recover materials such as pyrolysis carbon black and pyrolysis oils, which can then be reused in the tire manufacturing process. However, even these methods typically do not achieve a fully circular economy.

[0004] A typical tire construction poses drastic challenges to such a desirable circular economy. For example, it is known that noise absorbers, adhesives used for noise absorbers, and sealants pose a major problem due to their residual stickiness in almost every separation process. But even used tires that do not contain such noise absorbers, adhesives, and / or sealants, or that have already been stripped of them, present a significant challenge for efficient separation and recycling processes.

[0005] For example, a used tire, especially for passenger cars and light commercial vehicles, contains, in addition to steel cords as belt reinforcement and in the bead, carcass reinforcement in the carcass and belt reinforcement in the wound band, if one is used, made of a textile material. Typically, all reinforcements are embedded in an encasing rubber compound (often also called a rubber compound), frequently with the aid of adhesion promoters. This ensures that a strong bond between the reinforcement and the rubber compound is often maintained throughout the tire's lifespan. The bond between the textile reinforcements and the encasing rubber compound is usually significantly stronger than that between the steel cords and their rubber compound.This means that subsequently separating textile reinforcements from the surrounding rubber compound is very difficult (if not impossible). In contrast, steel cords, i.e., reinforcements made of a metallic material, can be separated from a rubber compound much more easily.

[0006] Furthermore, pneumatic tires with coiled casings containing textile reinforcements have a limited lifespan, as retreading is typically not an option. Removing the worn tread and applying a new one often fails because the coiled casing or its textile reinforcements are damaged during the mechanical removal of the worn tread. This usually renders the tire unusable, or at least unsuitable, for retreading.

[0007] Furthermore, in the conventional manufacturing of, for example, radial tires for passenger cars or light commercial vehicles, the contouring of the belt and the coil band, if a coil band is used, generally only takes place during the vulcanization of the tire. This is achieved by forming the tire blank, which is built up on cylindrical build-up drums, using a bellows inflated inside the tire blank placed in the tire heating mold. A disadvantage of this method is that material displacement and uneven expansion in the axial direction can occur during vulcanization. To counteract this, DE 10 2004 058 522 A1 provides for the use of a contoured build-up drum. In the method described therein, a steel belt is used, and the contoured build-up drum enables uniform expansion in the axial direction and distortion-free forming.Furthermore, it allows the coil bandage to be applied "near the contour" and thus easily ensure the desired bandage tension, using a coil bandage with highly elastic nylon threads as the bandage's strength carrier. A disadvantage is that, depending on the construction of the vehicle's pneumatic tire, the highly elastic nylon threads can cause undesirable radial expansion of the underlying material.

[0008] WO 2023 / 090022 A1 further specifies carcass reinforcement bars made of an organic material in radial construction, coil bandage reinforcement bars made of a highly elongated organic material with an elongation at break of >10%, and belt reinforcement bars made of steel within two belt layers. The coil bandage covers the belt edges of the belt.

[0009] JP 2023 544389 A describes a single carcass ply with textile carcass reinforcing elements, a belt with two belt plies, each with steel reinforcing elements, onto which a coiled bandage is wound radially outwards. This bandage consists of coiled bandage reinforcing elements made of an organic material, running at an angle of less than 10° to the circumferential direction. The coiled bandage covers the belt edges.

[0010] KR 102352893 B1 further describes that radially above two carcass plies lie two belt plies with steel belt reinforcements, the angles of which to the circumferential direction vary along the longitudinal extent of the belt reinforcements, with a larger angle to the circumferential direction at the tire's apex than in the shoulder areas. Furthermore, the belt reinforcements of different belt plies are arranged in such a way that they intersect in a cross pattern with opposite angles. The tread is directly adjacent to the radially above the belt plies.

[0011] KR 20050094681 A describes winding a coil bandage onto a belt, which consists of coil bandage reinforcement carriers made of a microfiber steel cord having a tensile strength of between 25kgf and 29kgf.

[0012] EP 1900549 A1 further describes that a coiled bandage made of curved coiled bandage reinforcement bars or coiled bandage reinforcement bars with a wave shape, each made of steel and having a tensile strength of between 2000 MPa and 5000 MPa, is arranged between the tread and a belt ply. This is intended to compensate for the circumferential growth in the coiled bandage during vulcanization. No metallic material is provided for the carcass or the belt. Furthermore, the coiled bandage covers the belt edges of the belt plies.

[0013] US Patent 11179970 B2 describes a belt with steel reinforcing bars arranged in a cross pattern, the angle of which varies longitudinally and is a maximum of 35° to the circumferential direction. A coil bandage covers the belt, the reinforcing bars of which are made of a highly elastic organic material. The coil bandage does not cover the belt edges of the radially underlying belt.

[0014] JP 6798273 B2 describes a carcass with carcass reinforcement bars made of an organic material, angled between 75° and 90° to the circumferential direction. Radially above this, a belt with high-tensile-strength belt reinforcement bars, particularly made of steel, is provided. These bars intersect, and their angles vary along the longitudinal axis, with smaller angles at the tire's zenith than at the tire shoulders. A coiled bandage is not provided.

[0015] KR 101467464 B1 describes a belt with layers whose reinforcing belts are arranged in a cross pattern and have an angle of less than 25° to the circumferential direction. A coil bandage is not included.

[0016] US Patent 5365988 A describes a belt with steel reinforcing elements, wherein a radially overlying coil bandage with non-metallic coil bandage reinforcing elements covers the belt edges. The belt reinforcing elements are arranged in a cross pattern. Radially beneath this is a carcass with carcass reinforcing elements made of a rubberized fabric.

[0017] In JP 6538520 B2, a belt made of belt reinforcements of a metallic material is provided, with the coil bandage covering the belt edges. The coil bandage consists of organic coil bandage reinforcements running at an angle of between 0° and 5° to the circumferential direction. The carcass has carcass reinforcements made of an organic material.

[0018] CN 211663006 U describes a coil bandage that covers the belt edges of the radially underlying belt. Additional coil bandage strips run in the shoulder area, and at the tire's zenith, adjacent coil bandage strips may be wound with a gap.

[0019] US patent 2019160874 A1 describes a coil bandage made of organic coil bandage reinforcement carriers, wherein the coil bandage also extends over belt edges of the belt.

[0020] JP 2010095057 A describes a belt that is not covered by the circumferentially running coil bandage, wherein the belt reinforcement members are coiled in a wavy manner in the circumferential direction. The coil bandage, made of metallic or organic reinforcement members, is placed only on the sides and next to the belt, wherein the coil bandage reinforcement members have a lower modulus of elasticity than the circumferentially running belt reinforcement members.

[0021] EP 1094956 B1 describes a run-flat tire which has a non-metallic, circumferentially extending reinforcing layer between the carcass and the belt, or alternatively, above the belt. The reinforcing materials of the layer are wound spirally around the circumference of the carcass or belt.

[0022] DE 4208705 A1 describes a steel belt whose belt edges are covered by a textile-reinforced strip.

[0023] KR 100976580 B1 describes a pneumatic tire for heavy vehicles, such as trucks or buses, with a corrugated, coiled belt reinforcement. This type of tire does not have a coiled band.

[0024] In GB 770673 A, CN 114056007 A and WO 2018 / 125181 A1, a carcass is provided which is designed as an angle carcass, i.e. the carcass reinforcement bars run at an angle of between 70° and 90° to the circumferential direction.

[0025] In US 5058649 A, KR 100187594 B1, US 5524688 A and WO 2019105620 A1, it is stipulated that there is no apex radially above the bead cores in the bead area between these and the carcass plies with carcass reinforcement made of a non-metallic material.

[0026] The following invention is based on the objective of providing a vehicle pneumatic tire that has a high load-bearing capacity, is stable and durable, and has an increased service life.

[0027] This problem is solved by a vehicle pneumatic tire according to the independent claim. The dependent claims specify preferred embodiments.

[0028] Accordingly, a vehicle pneumatic tire for passenger cars and / or light commercial vehicles comprises a tread, a carcass and a coiled bandage consisting of one or more than one coiled bandage layer with an axial coiled bandage extension, wherein - the coil bandage is arranged radially above the carcass, i.e. directly partially covering the carcass or with additional layers of material in between, and radially below the tread, i.e. directly covered by the tread or with additional layers of material in between, and the coil bandage has at least one coil bandage reinforcement carrier, and - the carcass has at least one carcass ply, wherein each carcass ply has at least one carcass reinforcement element and each carcass ply runs between bead areas of the vehicle pneumatic tire, wherein at least one bead core is arranged in each bead area and each carcass ply is folded over the at least one bead core in the respective bead area, so that a carcass fold is formed, wherein - at least one carcass reinforcement beam made of a metallic material runs through the carcass, - the bead core has a teardrop-shaped cross-section, i.e., it tapers to a point radially outwards and is essentially bulbous radially inwards, and there is no apex arranged radially above the bead core between the bead core and the carcass layer, or the bead area is free of an apex, - the carcass ridge runs radially below the sidewall or does not run in the sidewall, with the sidewall transitioning radially below a transition flank into a rim strip, and - the vehicle tire has a load index in the range of 71 to 126.

[0029] The invention offers the advantage that the carcass bulge with its rigid metallic reinforcement elements in the bead area is subjected to only minimal compression, particularly during contact with the tire's contact patch. This is because the carcass bulge does not extend into the sidewall, which is subject to greater stress during operation (i.e., the sidewall component forming the sidewall). Consequently, it is no longer subjected to increased bending forces, especially in the contact patch, and is therefore less stressed by compression within the tire. This ensures improved durability of the pneumatic tire with its metallic carcass reinforcement elements.

[0030] In order to provide sufficient space for the shorter carcass high-profile section within the bead area, it is advantageously not to provide an apex and instead to give the bead core a teardrop-shaped cross-section, so that excessive bending of the stiffer metallic carcass high-profile section can be avoided when the apex is omitted, thus ensuring sufficient stability in the bead area.

[0031] It is clear to those skilled in the art whether a particular element is considered a structural element in a given position or not. For example, in the context of the present invention, threads or filaments that typically serve for the classical distribution and / or conduction of electrical voltages are not structural elements within the meaning of the present invention. This applies equally to conventional threads or filaments for air drainage and other auxiliary components. This is particularly advantageous whenever such auxiliary components are not explicitly described as having a function designated as structural elements.

[0032] Furthermore, the feature "made of a metallic material" in the context of the present invention means that a corresponding metallic reinforcement consists essentially of the respective metallic material, for example, steel. The feature "made of steel" also means that a small proportion of a metal / metal alloy not typically referred to as steel is not excluded. For example, steel provided with a brass coating is included in this feature. Preferably, a metallic reinforcement made of steel comprises 90 percent or more by weight of steel, based on the total mass of the metallic reinforcement, preferably 92 percent or more by weight, particularly preferably 95 percent or more by weight, most preferably 97 percent or more by weight, and most preferably 99 percent or more by weight.

[0033] Furthermore, the carcass is preferably free of, or does not contain, for example, textile reinforcements, or the at least one metallic carcass reinforcement is the only reinforcement in the carcass. This improves the recyclability of the tire and reduces the effort required for retreading. The use of metallic carcass reinforcements reduces the susceptibility to damage when removing, for example, a worn tread. This allows the tire to be retreaded by applying a new tread, thus significantly increasing its overall lifespan. This can be considered a significant first step towards a circular economy, at least in principle.

[0034] During its lifespan, a pneumatic tire with metallic carcass reinforcements offers further significant advantages. The stability, stiffness, and durability of a pneumatic tire with metallic reinforcements, particularly in the carcass, are typically increased. Furthermore, a correspondingly equipped pneumatic tire has a higher load capacity, for example, in the form of a higher load index (also called load-carrying capacity index or load rating), compared to pneumatic tires of the same design and size but with textile carcass reinforcements. This would be advantageous in the future with regard to increasingly heavier electric vehicles, as tire dimensions would not necessarily need to be increased.

[0035] In the context of the present invention, the term "light commercial vehicles" refers to vehicles typically described as vans. Vehicle tires are typically assigned to a vehicle class by their dimensions, a load index (corresponding to a load capacity in kg per tire), and a speed rating. The load index of the vehicle tire according to the invention generally ranges from 71 to 126, covering both passenger cars and light commercial vehicles. This typically corresponds to a load capacity of 345 kg to 1700 kg. The vehicle tire according to the invention is therefore either a passenger car tire or a light commercial vehicle tire. In the context of the present invention, the load index is referenced to a tire pressure of 2.5 bar for single tires.

[0036] A vehicle tire with a load index in the range of 74 (375 kg) to 114 (1180 kg), preferably from 77 (412 kg) to 109 (1030 kg), more preferably from 80 (450 kg) to 107 (975 kg), and most preferably from 83 (487 kg) to 104 (900 kg) is particularly preferred. This applies preferably to vehicle tires for passenger cars. A vehicle tire with a load index in the range of 105 (925 kg) to 126 (1700 kg), preferably from 110 (1060 kg) to 124 (1600 kg), more preferably from 115 (1215 kg) to 122 (1500 kg), and most preferably from 116 (1250 kg) to 120 (1400 kg) is also particularly preferred. This applies particularly to pneumatic tires for light commercial vehicles.

[0037] Preferably, the vehicle pneumatic tire according to the invention comprises tires of category C1 and / or C2 according to the classification of tires based on Regulation (EC) No. 661 / 2009 of the European Parliament and of the Council of 13 July 2009. Accordingly, the vehicle pneumatic tire according to the invention is preferably not a tire of category C3. The vehicle pneumatic tire according to the invention is also not a bicycle tire and not a motorcycle tire, preferably not a two-wheeler tire, and not a truck tire and not a heavy-duty tire.

[0038] Preferably, the carcass rebate is arranged solely within a bead strip located radially below the sidewall to protect the bead area from the rim. The metallic carcass rebate is thus completely protected by the robust bead strip, and this area of ​​the bead strip is only minimally compressed anyway, especially in the tire contact patch when the pneumatic tire rolls on a surface, resulting in increased durability.

[0039] Preferably, a radially upper end of the carcass fold is located radially below a radially lower end of the sidewall, with the length between the upper surface of the bead core and the radially upper end of the carcass fold preferably being between 10 mm and 30 mm. In this way, the carcass fold does not project too far radially outwards into the more compressed or stressed areas of the tire.

[0040] Preferably, the respective bead core is further provided to have one of the following configurations in several layers: 3-4-3-2-1, 3-4-5-4-3-2-1, 2-3-2-1, 4-5-4-3-2-1 or 3-4-5-4-3-2-1, so that the respective bead core tapers radially outwards to form a teardrop shape. These configurations represent easy-to-wind layer sequences to achieve the desired teardrop shape with high tensile strength of the respective bead core.

[0041] Preferably, the at least one coil bandage reinforcement carrier has an elongation at break of between 2% and 6%, preferably between 3% and 5.5%, and particularly preferably between 3% and 5%.

[0042] With such a coiled bandage exhibiting high tensile stiffness or high elongation strength, radial expansion of the underlying radial material, particularly the carcass ply(s), or circumferential growth of the tire, can advantageously be effectively suppressed. This is especially beneficial when reduced longitudinal stiffness or reduced elongation strength of the underlying radial layers needs to be compensated for, for example, in the case of a carcass design as an angled carcass or a diagonal carcass, or in the case of a belt (if present) with a cross-stitch pattern.

[0043] Furthermore, the use of high-tensile-strength coiled bandage reinforcement and metallic reinforcement in the carcass layer enables the development of a pneumatic tire specifically designed for passenger cars and / or light commercial vehicles, offering increased stability, stiffness, and durability. Conventionally, such pneumatic tires utilize only non-metallic carcass reinforcement. Moreover, a correspondingly equipped pneumatic tire exhibits a higher load capacity, for example, in the form of a higher load index (also known as load-carrying capacity index or load rating), compared to pneumatic tires of the same design and size but with conventionally used textile reinforcement. This would be advantageous in the future, particularly with regard to the increasing weight of electric vehicles, as tire dimensions would not necessarily need to be enlarged.

[0044] Within the scope of the present invention, the elongation at break with the aforementioned percentage values ​​is understood to mean that the respective spool bandage reinforcement, which is neither rubberized nor installed in the vehicle pneumatic tire, can be stretched by a maximum of 6%, preferably by a maximum of 5.5%, and particularly by a maximum of 5%, before it breaks. Such an elongation at break can be achieved by a suitable design (stranding, twisting) of the respective reinforcement and / or by a suitable material selection for the respective reinforcement. The elongation at break is defined in accordance with ASTM D2969-04 from 2010 (for steel filaments / cords) or ASTM D885 from 2023 (for textile filaments / cords and for hybrid filaments / cords (steel and textile)).

[0045] Preferably, the at least one coil bandage reinforcement carrier with an elongation at break of between 2% and 6%, preferably between 3% and 5.5%, particularly preferably between 3% and 5%, is made of a textile material, in particular aramid, and / or of a metallic material, in particular steel.

[0046] Therefore, various materials can be used as reinforcing elements in the coil bandage, with which these elongations at break can be achieved through appropriate stranding. If the coil bandage reinforcing elements are made of a metallic material, or even exclusively of a metallic material, the previously mentioned improved recyclability and reduced retreading effort can be further enhanced, particularly if the reinforcing elements in both the carcass (for improved recyclability and reduced retreading effort) and the belt (if present, for improved recyclability) are also made exclusively of a metallic material, meaning that the aforementioned layers are free of textile reinforcing elements or do not contain any such elements.Furthermore, it may be provided that the at least one high-tensile-strength coil bandage reinforcement layer exhibits an elongation behavior that differs from the elongation behavior of the at least one metallic carcass reinforcement layer. Thus, different implementations in the respective layers are possible.

[0047] Preferably, the coil bandage is further provided to consist exclusively of coil bandage reinforcement elements with an elongation at break of between 2% and 6%, preferably between 3% and 5.5%, and particularly preferably between 3% and 5%. With such a design, a uniformly high-tensile strength structure with identical coil bandage reinforcement elements can be achieved throughout the entire coil bandage, since the at least one high-tensile strength reinforcement element is the only reinforcement element in the coil bandage.

[0048] Preferably, it is further provided that the at least one coil bandage reinforcement carrier runs at a first angle to the circumferential direction within the coil bandage, wherein the first angle is between 0° and 5°, preferably between 0° and 4°, particularly preferably between 0° and 3°, most preferably from 0° to 2°.

[0049] This prevents undesirable circumferential growth of the tire at high speeds, as the highly tensile-resistant construction of the wound bandage is then also less flexible. This is particularly advantageous with carcass reinforcement layers angled relative to the circumferential direction (diagonal construction or angled carcass) and also with angled belt reinforcement layers (if a belt is present). In this case, circumferential growth cannot be prevented as effectively by these layers, but this is compensated for by the less flexible wound bandage.

[0050] Preferably, the vehicle pneumatic tire further comprises a belt which is radially covered on the outside by the coil bandage and the belt has one, two or three belt layers, wherein the belt has at least one belt reinforcement carrier.

[0051] Depending on the desired design, a variable construction with or without a belt is possible, whereby a belt can additionally provide cohesion or reduce circumference growth of the carcass under reduced compression, depending on the construction. It is particularly preferred that a belt with one or two layers is provided. This is preferably intended for pneumatic tires for passenger cars. A belt with two or three layers is also particularly preferred. This is preferably intended for pneumatic tires for light commercial vehicles.

[0052] Preferably, it is further provided that at least one belt reinforcement layer made of a metallic material, in particular steel, runs independently of one another in each belt layer of the belt, wherein the belt preferably consists exclusively of belt reinforcement layers made of the metallic material, i.e., the belt is free of or has no textile reinforcement layers. This also improves recyclability.

[0053] Preferably, the belt is further provided to have two or three belt layers, with at least one belt reinforcement beam arranged in each belt layer, which runs at a second angle to the circumferential direction, wherein the second angle is between 35° and 55°, and the belt reinforcement beams of radially superimposed belt layers have opposite slope directions, so that belt reinforcement beams superimposed in the radial direction cross over each other to form a cross-brace.

[0054] A cross-bracing structure can also be formed within the belt, although in such a design the tensile strength or longitudinal stiffness of the entire belt is limited. This reduces the compression on the radially underlying metallic carcass. While the belt itself can then only partially prevent the circumferential growth of the vehicle tire at higher speeds, this can be compensated for by the design of the coiled bandage, for example, by the use of highly tensile-strength coiled bandage reinforcement elements and / or by the small initial angle of the coiled bandage reinforcement elements to the circumferential direction.

[0055] Preferably, however, the belt or individual belt layers can also be omitted. This saves weight and material, especially if the carcass design can compensate for the absence of the belt or individual belt layers, particularly with regard to stability, stiffness, and resistance. Recyclability can also be improved by the absence of the belt or individual belt layers.

[0056] Preferably, the coil bandage is further provided to have an axial coil bandage extension, - which is greater than an axial belt extension of the belt, or - which is less than or equal to a first axial belt extension of a first belt layer of the belt, and / or - which is larger than a second axial belt extension of a second belt layer of the belt, or - which is less than or equal to the second axial belt extension of the second belt layer of the belt, with the coil bandage covering a tire zenith of the vehicle pneumatic tire.

[0057] A variable construction is therefore possible, in which all belt edges, or at least some belt edges, are covered by the coil bandage to protect them or the belt reinforcement elements from unwanted movement within the tire, which could otherwise lead to internal damage or material weakening. However, depending on the tire design, it is also preferable to avoid excessive compression in the shoulder sections of the tire by the coil bandage reinforcement elements, which typically cover the belt edges in this area. To achieve this, the coil bandage reinforcement elements can be wound or laid onto the belt in such a way that the coil bandage does not extend axially beyond the belt edges. This also results in a reduction in mass and less heat generation at the belt edges.Moreover, such a design is particularly preferred if the belt reinforcement beams run at a second angle of between 35° and 55°, preferably between 40° and 45°, to the circumferential direction, i.e., a lower longitudinal tensile strength is formed.

[0058] The winding bandage layers, in which the winding bandage reinforcement carrier is wound, can preferably form an uninterrupted (i.e., continuous) layer in the axial direction by controlling the winding head with a constant feed such that axially adjacent winding bandage reinforcement carriers lie against or touch each other. Preferably, however, it can also be provided that the carcass reinforcement carriers in the at least one carcass layer of the carcass run at a third angle to the circumferential direction, wherein - the carcass has at least two carcass plies, each carcass ply having at least one carcass reinforcing layer made of a metallic material (mM), wherein the respective carcass reinforcing layer runs at a third angle of between 40° and 50°, preferably 45°, to the circumferential direction, and the carcass reinforcing layers of radially superimposed carcass plies have opposite directions of inclination, so that carcass reinforcing layers superimposed in the radial direction cross over each other to form a cross-laminated structure, or - the carcass has only one carcass ply, wherein the carcass ply has at least one carcass reinforcement carrier made of a metallic material, wherein the carcass reinforcement carrier runs at a third angle of greater than 70° and less than or equal to 90° to the circumferential direction.

[0059] The carcass can therefore be constructed in a diagonal (cross-bond) or radial construction. If the metallic carcass reinforcement elements in the pneumatic tire for passenger cars and / or light commercial vehicles are not oriented circumferentially, the rolling resistance and efficiency can be advantageously improved, resulting in an overall increase in efficiency and reduced fuel consumption. In the case of a driven wheel, a drive or braking torque is present at the respective wheel. These torques are transmitted through the sidewalls of the pneumatic tire, via the respective components of the layered tire structure, to the rim. A portion of these torques is transmitted to the carcass reinforcement elements via tensile forces.Since the carcass reinforcement bars are made of a metallic material, especially steel, and run at the aforementioned angle to the circumferential direction, the drive or braking torques in the form of tensile forces can be reliably absorbed via the reinforcement bars.

[0060] By choosing the third angle and the metallic material of the carcass reinforcement, it is possible to prevent adjacent reinforcements from being subjected to shear stress under applied torque and thus heating up, as can happen with carcass reinforcements made of organic or textile materials. Energy dissipation and the resulting increase in power loss can therefore be avoided or at least minimized, thereby increasing the efficiency of the pneumatic tire. Depending on the orientation of the carcass reinforcements, the pneumatic tire has a higher efficiency during acceleration and braking, leading to increased range, especially in electric vehicles. During braking, a larger portion of the braking energy can be recuperated and fed back into the battery because less energy is dissipated in the tire.

[0061] Furthermore, with carcass reinforcement bars angled relative to the circumferential direction, the number of belt plies in the belt can be reduced to save weight and material. In this case, the angled carcass reinforcement bars in the carcass layer can compensate for the absence of at least one belt ply with regard to stability, stiffness, and resistance. The recyclability of the pneumatic tire can also be improved by the absence of a belt ply. Preferably, the second angle of the belt reinforcement bars can also be selected depending on the number of carcass plies, as well as the third angle of the carcass reinforcement bars, in order to coordinate them with regard to stability, stiffness, and resistance.

[0062] Preferably, it is further provided that gaps with a specific gap width are arranged between at least some axially adjacent windings of the at least one coil bandage strength carrier with an elongation at break of between 2% and 6%, preferably between 3% and 5.5%, particularly preferably between 3% and 5%, wherein the gap widths are identical or the gap widths change with increasing axial distance of the respective gap to a tire zenith of the vehicle pneumatic tire. wherein the gap widths are, for example, between 0.5 times and 2 times the diameter of the coil bandage reinforcement carriers when the at least one provided coil bandage reinforcement carrier is wound individually, or The gap widths are, for example, between 0.5 times and 1.5 times the width of a rubber strip, but preferably between 3mm and 10mm, when the at least one provided coil bandage reinforcement carrier is embedded in the rubber strip and wound on top.

[0063] A "gap spool" can therefore be created, for example by so-called "gap spooling," meaning that in certain areas the individual spool reinforcement carriers or the rubber strips with the embedded spool reinforcement carriers do not touch. Instead, they are wound with interruptions. It may be preferably provided that - the gap widths increase with increasing axial distance of the respective gap to the tire zenith when the gaps are arranged in side sections of the coil bandage, and / or - the gap widths become smaller with increasing axial distance to the tire zenith when the gaps are arranged in the area of ​​the tire zenith, preferably over an axial extent of between 10% and 70% of the coil bandage extent around the tire zenith.

[0064] This, in addition to a shortened design of the spooled bandage above the belt edges or in the sidewalls, prevents excessive compression in the shoulder sections of the tire by the respective spooled bandage reinforcement layer. This is achieved, for example, by "thinning" the bandage by creating gaps in the area of ​​the belt edges or in the sidewalls. Alternatively or additionally, such "thinning" in the area around the tire's zenith can also reduce compression on the radially underlying layers in this area below the spooled bandage. Furthermore, this "gap spooling" saves material and weight.

[0065] The at least one high-tensile-strength reinforcement layer in the wound bandage is preferably incorporated within an encasing rubber compound (individual sheathing or the rubber strip), whereby this rubber compound can in turn form a strong bond with other rubber compounds in the vehicle tire (e.g., in the underlying belt or the tread above it). However, it is also possible for the at least one high-tensile-strength reinforcement layer to be incorporated into the wound bandage without rubber or only partially rubberized. Preferably, the radially underlying belt and / or the radially above it can have an adhesive compound to create a sufficient bond with the respective reinforcement layer in the wound bandage.

[0066] The drawings show: Fig. 1 a sectional view of a vehicle tire; Fig. 2A-2E Detailed views of a coil bandage of the vehicle pneumatic tire according to Fig. 1; Fig. 3A, Fig. 3B Detailed views of the belt of the vehicle pneumatic tire according to Fig. 1; Fig. 3C-3F further embodiments of the coil bandage of the vehicle pneumatic tire according to Fig. 1; Fig. 4A, Fig. 4B Detailed views of a carcass of a vehicle pneumatic tire according to Fig. 1; Fig. 4C a detailed view of a bead area of ​​the vehicle pneumatic tire in a further embodiment; Fig. 5 a flowchart of a process for manufacturing the vehicle pneumatic tire according to Fig. 1; Fig. 6A-6E a tire assembly plant for carrying out the procedure according to Fig. 5.

[0067] Fig. Figure 1 schematically shows a vehicle pneumatic tire 50 in a radial cross-section, intended for passenger cars or light commercial vehicles and accordingly having a load index (corresponding to a load capacity in kg per tire) in the range of 71 to 126. The vehicle pneumatic tire 50 has at least the following features: - a largely airtight inner layer 1; - a carcass 2, which, for example, extends in a conventional manner from a tire zenith Z of the vehicle pneumatic tire 50 over sidewalls 3 to bead areas 4 and is anchored there by wrapping around tensile-resistant bead cores 5; - a profiled tread strip 6 located radially outside the carcass 2, which is preferably formed by a cap and a base and has a profile with an application-specific tread depth; - a belt 7 arranged in the radial direction rR between the tread 6 and the carcass 2, comprising at least one belt layer 7a, preferably two belt layers 7a (as shown, a first belt layer 7a1 and a second belt layer 7a2) or also three belt layers 7a (not shown); and - a coil bandage 8 covering the belt 7 radially outwards, which has at least one coil bandage layer 8a.

[0068] The coil bandage 8 covers, according to the embodiment in Fig. The coil bandage 8 extends axially beyond these belt edges 9, 9a, 9b on both sides in the axial direction aR, i.e., the axial coil bandage extension A8 of the coil bandage 8 is greater than the axial belt extension A7 of the belt 7. In the illustrated embodiment, the axial belt extension A7 is defined by a first axial belt extension A71 of the axially wider first belt layer 7a1. This allows the belt edges 9, 9a, 9b to be held down and protected for high-speed resistance and durability.

[0069] The coil bandage 8 includes, according to the excerpt in Fig. 2A within the respective coil bandage layer 8a furthermore one or more coil bandage reinforcement carriers 8b in the form of individual wires or filaments 10 or in the form of cords C made of several twisted or intertwined filaments 10 (see Fig. 2B), wherein the one or more coil bandage reinforcement carriers 8b run parallel to each other and substantially along a circumferential direction U of the vehicle pneumatic tire 50. The one or more coil bandage reinforcement carriers 8b are applied annularly over the entire axial coil bandage extension A8 of the coil bandage 8 on the outer circumference of the belt 7, preferably wound spirally thereon, wherein this in Fig. 2A is only partially shown. Furthermore, the one or more coil bandage reinforcement carriers 8b are coated with rubber or embedded in a rubber layer. As explained later, either a single rubberized coil bandage reinforcement carrier 8b can be wound in a ring around the outer circumference of the belt 7, or several coil bandage reinforcement carriers 8b can be wound side by side within a rubber strip G wound in a ring around the outer circumference of the belt 7.

[0070] As in Fig. As shown in a schematic top view in Figure 2C, the one or more coil bandage reinforcement carriers 8b within the respective coil bandage layer 8a extend at a first angle α1 to the circumferential direction U, wherein this first angle α1 in the vulcanized state of the vehicle pneumatic tire 50 is preferably between 0° and 5°, more preferably between 0° and 4°, particularly preferably between 0° and 3°, and most preferably between 0° and 2°. In this embodiment, this small first angle α1 relative to the circumferential direction U is intended to prevent undesirable circumferential growth of the vehicle pneumatic tire 50 at high speeds.

[0071] To achieve this, in addition to selecting a small first angle α1 for one or more coil bandage reinforcement elements 8b, the coil bandage 8 as a whole is designed to have high tensile stiffness or high tensile strength in order to effectively suppress radial expansion of the radially underlying material. For this purpose, the respective coil bandage reinforcement element 8b is designed and / or manufactured from a material such that the elongation at break D of the respective coil bandage reinforcement element 8b is between 2% and 6%, preferably between 3% and 5.5%, and particularly preferably between 3% and 5%. The elongation at break D is determined in accordance with ASTM D2969-04 from 2010 (for steel cords) or ASTM D885 from 2023 (for textile cords and hybrid cords (steel and textile)), i.e.,The respective coil bandage reinforcement carrier 8b, which is neither rubberized nor installed in the vehicle pneumatic tire 50, can be stretched by a maximum of 6%, preferably by a maximum of 5.5%, and in particular by a maximum of 5%, before it breaks. In this way, a highly tensile-strength coil bandage reinforcement carrier 8b, and thus also a highly tensile-strength coil bandage 8, is provided.

[0072] For example, a metallic material mM can be selected as the material for the respective coil bandage reinforcement carrier 8b, preferably steel. The metallic material mM is in the form of individual filaments 10 or preferably in the form of cords C made of intertwined filaments 10, as shown in Fig. Figure 2B illustrates this by way of example. Accordingly, at least two, preferably three (as shown), metallic filaments 10 are individually twisted together to form several strands 11, the individual strands 11 being in turn also twisted together to form a single cord-like coil bandage reinforcement carrier 8b. For example, a single coil bandage reinforcement carrier 8b can be constructed in a 3 x 3 structure (three twisted strands 11, each with three twisted filaments 10). However, a cord C can also consist of only one strand 11 with the corresponding number of twisted filaments 10.

[0073] In the case of such a cord C, the filament diameter D10 of the individual twisted or stranded metallic filaments 10 is, for example, between 0.1 mm and 0.3 mm, preferably between 0.14 mm and 0.25 mm. Depending on the type of twisting or stranding, this results in a cord diameter DC of, for example, between 0.3 mm and 1.2 mm, preferably between 0.5 mm and 1 mm. A single metallic filament 10 already exhibits an elongation at break D of, for example, approximately 2%. However, if the individual filaments 10 are twisted, the elongation at break D of the respective coil bandage reinforcement carrier 8b, designed as a cord C, increases to, for example, between 3.5% and 6%, depending on the type of twisting or stranding. The elongation at break D is therefore not only determined by the material, but also by the structural design of the respective coil bandage reinforcement carrier 8b.

[0074] However, a textile material tM can also be used as the material, for example aramid, from which the respective coil bandage reinforcement carrier 8b is preferably formed in the form of a multifilament yarn or a cord C made of several intertwined filaments 10, for example aramid fibers, as in Fig. The diagram is shown in 2D cross-section. Accordingly, a plurality, for example more than 100, preferably more than 200, of intertwined textile filaments 10 are combined to form a cord C. The cord diameter DC of the respective textile cord C is, as with the metallic filaments 10, for example between 0.3 mm and 1.2 mm, preferably between 0.5 mm and 1.2 mm. In such a form as a textile multifilament yarn or as a textile cord C, such a coil bandage reinforcement carrier 8b exhibits, depending on the type of twisting or stranding, i.e., whether as an x1 cord, as in Fig. The design is represented in 2D, or as an x2 cord (with two such twisted textile cords C), or, depending on the twist level, exhibits an elongation at break D of, for example, between 2% and 6%. For a textile material tM, x2 cords are preferred because they offer better fatigue resistance.

[0075] Hybrid variants are also possible. For example, textile filaments 10 can be combined with metallic filaments 10 within a coil bandage reinforcement carrier 8b. In such hybrid variants, the material and / or the structural design of the respective coil bandage reinforcement carrier 8b must be selected such that an elongation at break D of between 2% and 6%, preferably between 3% and 5.5%, and particularly preferably between 3% and 5%, is achieved.

[0076] In a preferred embodiment, however, it is provided that mainly, preferably exclusively, coil bandage strength carriers 8b made of a metallic material mM are used in order to enable, in addition to the high tensile strength, an improved recyclability of the vehicle pneumatic tire 50 or also a retreading of the vehicle pneumatic tire 50 without increased effort.

[0077] The targeted selection of the material and / or the design of the respective coil bandage reinforcement carrier 8b to achieve the required elongation at break D (or high tensile strength) as well as the targeted selection of the small first angle α1 is particularly advantageous when a reduced longitudinal stiffness or a reduced tensile strength of the radially underlying belt 7 needs to be compensated for. In some embodiments of the vehicle pneumatic tire 50, it may be provided that the in Fig. 3A schematically represented belt reinforcement beam 7b in the one or more belt layers 7a; 7a1, 7a2 of the belt 7 do not run as conventionally at a shallow second angle α2 of less than 35° to the circumferential direction U, but as in a schematic top view in Fig. 3B shows the belt running at a second angle α2 to the circumferential direction U, which lies between 35° and 55°, preferably between 40° and 45°. In such a design, the tensile strength or longitudinal stiffness of the entire belt 7 is limited, so that the belt 7 itself can only partially prevent the circumferential growth of the vehicle tire 50 at higher speeds. This is compensated for in the above design by the construction of the coil bandage 8, in particular by a suitable selection of D and α1.

[0078] With two belt layers 7a; 7a1, 7a2, as in Fig. 1, Fig. 3A and Fig. As shown in Figure 3B as an example, the belt reinforcement bars 7b run within the respective belt layer 7a; 7a1, 7a2 at the specified second angle α2 to the circumferential direction U, whereby the belt reinforcement bars 7b have a different slope direction in each belt layer 7a; 7a1, 7a2, so that the radially superimposed belt reinforcement bars 7b cross each other or form a so-called cross bond.

[0079] The belt reinforcement elements 7b, like the respective coil bandage reinforcement element 8b, can be made of a metallic material mM, preferably steel. Metallic belt reinforcement elements 7b can also be combined with belt reinforcement elements 7b made of a textile material tM, for example, polyester, nylon, rayon, aramid, or the like. However, it is preferred to use only belt reinforcement elements 7b made of a metallic material mM in order to enable improved recyclability of the vehicle pneumatic tire 50. The belt reinforcement elements 7b are also available in the form of individual wires or filaments 10 and / or in the form of cords C made of several twisted or intertwined filaments 10. Furthermore, the belt reinforcement elements 7b are also preferably coated with rubber or embedded in a rubber layer.

[0080] The second angle α2 of the belt reinforcement elements 7b of between 35° and 55°, preferably between 40° and 45°, can be selected, for example, when the radially underlying carcass 2 has carcass reinforcement elements 2b in the individual carcass layers 2a in the form of wires or filaments 10 embedded or sheathed in rubber, or cords C consisting of several filaments 10, which, according to the invention, are at least partially, preferably exclusively, made of a metallic material mM, particularly preferably steel. This allows not only the provision of a robust pneumatic tire 50, but also improved recyclability.

[0081] In the case of a carcass 2 made of metallic carcass reinforcement members 2b, it is also necessary to ensure that the carcass reinforcement members 2b are compressed less during operation of the vehicle pneumatic tire 50, particularly to achieve good durability of the carcass reinforcement members 2b under dynamic loads. This is achieved precisely by having the belt reinforcement members 7b run, as described, at the largest possible second angle α2 of between 35° and 55°, preferably between 40° and 45°, to the circumferential direction U. In this case, the belt reinforcement members 7b can yield more easily under dynamic load, and less compression acts on the radially underlying carcass 2.

[0082] In summary, a pneumatic tire 50 for passenger cars and / or light commercial vehicles utilizes a carcass 2 with metallic carcass reinforcement elements 2b, and the resulting properties are addressed by a corresponding design of the belt 7 and the wound band 8 as described. Depending on the design and application of such a pneumatic tire 50 for passenger cars and / or light commercial vehicles, when using a carcass 2 with metallic carcass reinforcement elements 2b, it may also be possible to construct the belt 7 and / or the wound band 8 differently from the designs described above, as illustrated below:

[0083] According to one embodiment, for example, it may be provided that the axial coil bandage extension A8 is also less than or equal to the axial belt extension A7 or the first axial belt extension A71 of the axially wider or radially lower first belt layer 7a1, as in Fig. 3C indicates different variants with dashed lines. Accordingly, the axial coil bandage extension A8 of the coil bandage 8 - be equal to the first axial belt extension A71, or - smaller than the first axial belt extension A71 but larger than a second axial belt extension A72 of the radially upper second belt layer 7a2, or - be less than or equal to the second axial belt extension A72.

[0084] The belt 7, which runs axially aR between shoulder sections 12 of the vehicle tire 50, is then no longer completely covered by the coil bandage 8 at the first belt edge 9a of the first belt layer 7a1 and possibly also at the second belt edge 9b of the second belt layer 7a2. Compared to the design in Fig. 1. Thus, side sections 8c of the coil bandage 8 are omitted, or the respective coil bandage reinforcement carrier 8b wound onto the belt 7 extends, if at all, only to a small extent into the shoulder sections 12 of the vehicle pneumatic tire 50.

[0085] This, in combination with the selected larger second angle α2 of the belt reinforcement 7b (lower longitudinal tensile strength) and in conjunction with the metallic material mM of the carcass reinforcement 2b, prevents excessive compression in the shoulder sections 12 of the vehicle tire 50 by the respective coil band reinforcement 8b. Furthermore, the lower mass and reduced heat generation at the belt edges 9a, 9b have a positive effect on the high-speed performance of the vehicle tire 50.

[0086] This embodiment can also be used for certain applications of the vehicle pneumatic tire 50 with a coiled bandage 8, where the respective coiled bandage reinforcement carrier 8b does not exhibit an elongation at break D of between 2% and 6%, preferably between 3% and 5.5%, and particularly preferably between 3% and 5%. In this case as well, excessive compression by the respective coiled bandage reinforcement carrier 8b in the shoulder sections 12 of the vehicle pneumatic tire 50 can be prevented. However, this compression occurs more frequently with highly tensile-strength coiled bandage reinforcement carriers 8b, so that the reduced axial extension offers an even greater advantage.

[0087] Instead of or in addition to this shortened version of the coil bandage 8, it can be provided that the respective coil bandage reinforcement carrier 8b is wound onto the radially underlying belt 7 in such a way that at least in the side sections 8c of the coil bandage 8 a gap L with a gap width BL is formed between axially adjacent windings of the coil bandage reinforcement carriers 8b. The gap width BL can be constant or it can increase with increasing axial distance from the tire zenith Z. In the side sections 8c of the coil bandage 8, a gap width BL of, for example, between 0.5 times and 2 times a coil bandage reinforcement carrier diameter D8b, i.e., the cord diameter DC of the coil bandage reinforcement carriers 8b designed as cords C or the filament diameter D10 of the coil bandage reinforcement carriers 8b designed as individual filaments 10, can be selected.

[0088] In the radial direction rR above the first belt edge 9a of the first belt layer 7a1 and, if applicable, also the second belt edge 9b of the second belt layer 7a2, the windings of the respective coiled bandage reinforcement carrier 8b are thus "thinned out." This also prevents excessive compression by the respective coiled bandage reinforcement carrier 8b in the shoulder sections 12 of the vehicle tire 50, in combination with the selected larger second angle α2 of the belt reinforcement carrier 7b (lower longitudinal tensile strength) and in conjunction with the metallic material mM of the carcass reinforcement carrier 2b. Furthermore, material can be saved and the weight of the vehicle tire 50 reduced.

[0089] According to a further embodiment, it is provided that the carcass reinforcement elements 2b running between the two bead areas 4 of the carcass 2 enclose a third angle α3 to the circumferential direction U, which - in the case of a radial construction of the vehicle pneumatic tire 50 (in the vulcanized state of the vehicle pneumatic tire 50) is between 70° and 90°, or - in a diagonal construction of the vehicle pneumatic tire 50 (in the vulcanized state of the vehicle pneumatic tire 50) between 40° and 50°, preferably 45°.

[0090] The design as a 50-series pneumatic tire with a diagonal construction offers the advantage that drive and braking forces in the form of tension can be absorbed by the carcass reinforcement elements 2b with only minimal energy losses. This is because, due to their angle relative to the circumferential direction U, these elements are displaced less during acceleration and braking, resulting in less energy loss as heat. This is particularly relevant for electric vehicles, as it not only achieves higher efficiency during acceleration but also allows a larger portion of the braking energy to be recuperated and fed back into the energy storage system, since less energy is dissipated in the 50-series pneumatic tire. Overall, this results in increased efficiency during operation.

[0091] According to a preferred embodiment, which is also in Fig. As shown in Figure 4A, two carcass layers 2a are provided within the carcass 2, each carcass layer 2a having carcass reinforcement carriers 2b extending at the third angle α3 to the circumferential direction U. The carcass layer 2a is as shown in Fig. Figure 1 shows the tensile-resistant bead cores 5 folded over or folded upwards, i.e., a carcass fold 2f forms on the axially outer side of the respective bead area 5. In each carcass layer 2a, however, the carcass reinforcement elements 2b have a different slope direction, so that the radially overlapping carcass reinforcement elements 2b cross over each other or form a so-called cross-lamination. As a result, the carcass reinforcement elements 2b made of the metallic material remain relatively flexible overall, so that lower rolling resistance results at high speeds.

[0092] The carcass high-roll 2f proceeds according to the in Fig. 1. In the standard construction shown, the carcass fold 2f does not extend to the side walls 3. In a different so-called C-construction (not shown), the carcass fold 2f can, however, extend to below the belt 7 or below the coil bandage 8.

[0093] In an optional version, in such a design of the carcass 2, two carcass layers 2a with metallic carcass reinforcement bars 2b in a cross bond can be joined by the radially overlying belt 7, for example with metallic belt reinforcement bars 7b and in a cross bond (see. Fig. 3B), are omitted. This saves material and therefore also improves the recyclability of the vehicle pneumatic tire 50. However, if a belt 7 is provided, a second angle α2 of the belt reinforcement members 7b of between 20° and 55°, preferably between 30° and 35°, can be selected due to the design of the carcass 2 as a diagonal carcass, since the diagonal carcass already experiences less compression due to the third angle α3 of the carcass reinforcement members 2b.

[0094] To optimize compression on the carcass 2, the coil bandage 8, which continues to lie radially above it, can be shortened in its side sections 8c and / or have coil bandage reinforcement carriers 8b, which, as above, are based on Fig. 3D described a correspondingly enlarged gap L, so that the coil bandage reinforcement carriers 8b in the side sections 8c of the coil bandage 8 are “thinned”.

[0095] Furthermore, in a design as a vehicle pneumatic tire 50 in radial or diagonal construction, it may be provided that a reinforcement spacing A2b is left between adjacent carcass reinforcement elements 2b in edge regions 2c of carcass strips 2S, from which the respective carcass ply 2a is composed in the circumferential direction U, which corresponds to between 1 and 1.5 times a carcass reinforcement element diameter D2b of the carcass reinforcement elements 2b, as shown in Fig. 4B is shown. This can be achieved, for example, by omitting every second carcass reinforcement bar 2b in the two edge regions 2c of a calendered material web, within which the parallel carcass reinforcement bars 2b are embedded in rubber. This creates a correspondingly large gap 13 between the carcass reinforcement bars 2b with the reinforcement bar spacing A2b. The carcass strips 2S are then cut from this calendered material web to the appropriate length and with the corresponding angle of the carcass reinforcement bars 2b, and joined at their edge regions 2c by overlap splicing with further carcass strips 2S. Several such joined carcass strips 2S then form the carcass layer 2a, which extends in the circumferential direction U.

[0096] The edge regions 2c extend over an edge length L2c of, for example, between 3 mm and 10 mm, preferably over 5 mm, starting from an edge edge 2d of the respective carcass strip 2S. With edge regions 2c of the respective carcass strip 2S designed in this way, it can be achieved that during overlap splicing during the preparation of the respective carcass layer 2a, i.e., during the surface overlapping of the two edge regions 2c of adjacent carcass strips 2S in an overlap area 2e, the carcass reinforcement carriers 2b in the radially overlapping edge regions 2c are offset from each other in the circumferential direction U. In particular, these are arranged such that a carcass reinforcement carrier 2b is arranged within a carcass strip 2S in the radial direction rR adjacent to a space 13 within the respective radially adjacent carcass strip 2S.

[0097] In this way, unlike conventional overlap splicing, the overlap area 2e between two carcass strips 2S does not contain twice as many carcass reinforcement elements 2b as outside the overlap area 2e within the respective carcass strip 2S, but rather a similar number of carcass reinforcement elements 2b as outside the overlap area 2e within the respective carcass strip 2S. This results in the additional advantage, particularly with the carcass reinforcement elements 2b made of a metallic material mM used here, that the modulus and the flexural strength (and thus the restoring moments) within the multiple overlap areas 2e on the circumference of the carcass layer 2a largely correspond to the modulus and the flexural strength outside the overlap areas 2e within the respective carcass strip 2S or the carcass layer 2a formed from it.This also prevents the unintentional opening of the carcass flap 2f of the carcass 2.

[0098] In a radial design for a vehicle tire 50 with only one carcass ply 2a, it can also be provided that the carcass reinforcement members 2b run at a third angle α3 to the circumferential direction U of greater than 70° but less than 90°, thus forming a so-called angled carcass. Such a slight angulation of the carcass reinforcement members 2b relative to the circumferential direction U can increase the efficiency of the vehicle tire 50 and, due to the metallic carcass reinforcement members 2b, also improve rolling resistance. For example, a standard carcass high-profile design 2f, as in Fig. 1 shown, or preferably a C-construction of the carcass high-fold 2f, which extends at least to below the belt 7 or to below the winding band 8, may be provided. In the case of such an angled carcass, a belt layer 7a can be omitted in the radially above belt 7, the technical effect of which can be compensated for by a slight angulation of the carcass reinforcement members 2b.

[0099] Furthermore, as in Fig. As shown in Figure 4C, the carcass reinforcement members 2b, made of a metallic material mM, are designed so that in a standard construction, the carcass rim 2f does not extend into the sidewall 3, but is merely located within a bead strip 4a (rim strip) that protects the bead area 4 from the rim. In the bead area 4, the inflated pneumatic tire 50 is typically pressed against the rim by the more robust bead strip 4a, thus protecting the tire 50 from damage in this area. At a transition edge F, the bead strip 4a extends radially rR into the sidewall 3, with a radially upper end 2g of the carcass rim 2f lying radially below this transition edge F.

[0100] In particular, the radially upper end 2g of the carcass high-profile section 2f also lies radially below a radially lower end 3a of the sidewall 3, which in cross-section represents the radially lowest point of the sidewall 3 on the respective tire side. This results in a length between a bead core top surface 5a of the bead core 5, formed by the radially uppermost layer of the bead core 5, and the radially upper end 2g of the carcass high-profile section 2f of, for example, between 10 mm and 30 mm.

[0101] In this design, the carcass high-profile section 2f is additionally protected, since this area radially below the transition edge F is already less compressed, especially in the tire contact patch when the vehicle tire 50 rolls on a surface. Furthermore, the material of the bead 4a is more robust than, for example, the sidewall 3, so that forces are absorbed more effectively.

[0102] Furthermore, in such a design, it is provided that radially above the bead core 5, between this core and the carcass layer 2a, there is no apex 4b (as in Fig. 1 with a radially longer carcass rise 2f). In order to avoid excessively sharp bends in the carcass layer 2a in the area of ​​the bead core top surface 5a, the bead core 5 has a teardrop-shaped cross-section. This can be achieved, for example, by constructing the bead core 5 in several layers 5b with a layer height H5b (or a wire thickness of the wires forming the bead core 5) of, for example, between 1.2 mm and 1.7 mm, according to one of the following configurations or arrangements: 3-4-3-2-1 (as shown), 3-4-5-4-3-2-1, 2-3-2-1, 4-5-4-3-2-1 or 3-4-5-4-3-2-1.

[0103] This makes the bead core 5 increasingly pointed radially outwards, thus compensating for the absence of the apex 4b. The carcass high-cut 2f can therefore be achieved with a smaller radial extent compared to the version in Fig. 1 end and thus only run within the bead band 4a in order to achieve the above advantages.

[0104] The following will be based on the Fig. Sections 5 and 6A-6E describe the tire construction process, which is used in particular to... Fig. Figure 1 shows a vehicle pneumatic tire 50 for a passenger car and / or for light commercial vehicles with a carcass 2 made of metallic carcass reinforcement members 2b as described above, which can be manufactured in the individual embodiments. The problem is that the tire blank 50R (“green tire”, i.e., in the unvulcanized state), assembled from the individual components (inner layer 1, carcass 2, belt 7, coil band 8, tread 6, bead core 5, etc.), expands by up to 4% (in the radial direction rR) at the tire zenith Z and also to a lesser percentage in the shoulder sections 12, due to the effects of pressure and temperature during insertion into the vulcanization mold 27, before the final vehicle pneumatic tire 50, made of elastic rubber with its inseparably bonded components and the incorporated tread pattern, is completed in the vulcanization tool.

[0105] However, such radial expansion of up to 4% is problematic with a tire blank 50R, which, as described, has at least a carcass 2 with metallic carcass reinforcement members 2b and, in certain embodiments, also a coiled bandage 8 with high-tensile-strength coiled bandage reinforcement members 8b, which run at a small first angle α1 to the circumferential direction U of preferably between 0° and 5°, preferably between 0° and 4°, particularly preferably between 0° and 3°, and most preferably from 0° to 2°. Particularly across the tire cross-section, uneven expansion of the respective materials occurs, which can lead to material displacements relative to the surrounding components as well as to an uneven stress distribution in the respective reinforcement members 2b, 7b, 8b.Furthermore, changing the first angle α1 of the coil bandage reinforcement carriers 8b to compensate for radial expansion during vulcanization is only possible to a limited extent, especially with small first angles α1, as described. Therefore, the manufacturing process described below is used to enable such a construction of the tire blank 50R or the vehicle pneumatic tire 50 in a simple and reliable manner.

[0106] According to Fig. 5 and Fig. In a first step, ST1, a construction drum 20 is provided as part of a tire building system 100, which can be rotated about a drum axis 21. The construction drum 20 generally consists of segments distributed around its circumference, each of which is movable in the radial direction rR to allow the outer diameter of the construction drum 20 to be reduced or increased.

[0107] According to a preferred embodiment, the construction drum 20 is surface contoured, i.e., its outer surface 22 is not planar, but has a convexly curved shape or a rounded cross-sectional contour, as shown in Fig. Figure 6A illustrates this. The outer surface 22 thus has a radial axial distance rA to the drum axis 21, which is at its maximum at the zenith 20Z of the construction drum 20. Starting from the zenith 20Z, the radial axial distance rA decreases on both sides in the axial direction aR towards the shoulder regions 20S of the construction drum 20. The outer surface 22 of the construction drum 20 is therefore largely or almost completely adapted to the cross-sectional contour of the components of the finished pneumatic tire 50, i.e., the carcass 2, the belt 7, and the spool band 8.

[0108] In a second step ST2, a ring-shaped tire assembly 23 is positioned radially rR above the build drum 20. This assembly consists at least of the inner layer 1, the carcass 2, and the bead sections 4 with the bead cores 5 and optionally other components, each circulating in a ring. The tire assembly 23 is preferably assembled from its individual components on a separate drum (not shown) and positioned radially above the outer surface 22 of the build drum 20 via a transfer device (not shown). Alternatively, the individual components can be wound directly onto the build drum 20 to assemble the tire assembly 23 directly on the drum.

[0109] The carcass 2 is constructed according to the respective embodiment as described above, i.e., with one or two carcass layers 2a, each with carcass reinforcement elements 2b made of a metallic material, in particular steel. The carcass layers 2a are arranged as described in Fig. 1 or Fig. 4C shown in a standard construction around the tensile-resistant bead cores 5 folded over or folded up, i.e., on the axially outer side of the respective bead area 5, the carcass foldover 2f is formed, either with apex 4b (see. Fig. 1) or without apex (see Fig. 4C). However, a C-construction as described above is also possible. The carcass layers 2a themselves are then, for example, as described above, in the case of two carcass layers 2a in a cross-bond ( Fig. 4A) (diagonal construction) or in the case of a carcass layer 2a in radial construction with carcass reinforcement beams 2b running at 90° or in radial construction with greater than 70° and less than 90° (angle carcass) wherein the carcass reinforcement beams 2b in the case of a radial construction with an angle carcass or in the case of a diagonal construction are located in edge areas 2c of the carcass strips 2S forming the carcass layer 2a with the widened reinforcement beam spacing A2b to each other.

[0110] In a third step ST3, the assembled tire package 23 is fixed centrally, for example in a conventional manner using clamping devices 24 arranged (axially) on both sides of the construction drum 20, on which the side walls 3 may already be positioned. In this state, which is described in Fig. As shown in Figure 6B, the construction drum 20 (or its segments) is still in its retracted state, in which the tire package 23 is clamped between the clamping devices 24 and the outer surface 22 of the construction drum 20 only touches tangentially at the zenith 20Z.

[0111] In a fourth step ST4, the belt 7, comprising individual belt layers 7a, 7a1, 7a2, which is assembled on a separate belt drum (not shown) away from the construction drum 20, is provided via a transfer device 25 and positioned centrally above the construction drum 20. The belt 7 is constructed according to one of the respective embodiments as described above, i.e., it can have one or more belt layers 7a, 7a1, 7a2 with belt reinforcement elements 7b made of a metallic material mM or a textile material tM, which preferably run at the second angle α2 of between 35° and 55° to the circumferential direction U and, in the case of two belt layers 7a, 7a1, 7a2, may optionally also be positioned in a crosswise pattern relative to each other.

[0112] In a fifth step ST5, the construction drum 20 is enlarged in the radial direction rR, as shown in Fig. Figure 6C shows the clamping devices 24 being simultaneously moved axially aR. As a result, the tire package 23, particularly in its central region, adapts to the convexly curved shape of the outer surface 22 of the construction drum 20 in the illustrated embodiment, so that the tire package 23 also assumes a curved shape. At the same time, this radial expansion of the construction drum 20 presses the radially upper carcass 2 of the tire package 23 against the belt 7 positioned radially above it.

[0113] Through appropriate measures, the belt 7 conforms fully to the curved tire package 23 or the radially upper carcass 2 over its entire axial belt extension A7, so that in this embodiment the belt 7 is also adapted to the curved shape of the outer surface 22 of the construction drum 20. The full-surface conformity of the belt 7 to the tire package 23 or the carcass 2 can be achieved, for example, by an inflatable cuff on the transfer device 25, by radial deformability of the transfer device 25, or by other means that cause the belt 7 to be pressed fully and over its entire axial belt extension A7 against the already contoured or curved tire package 23.

[0114] In some of the above-described embodiments, the belt 7 can also be omitted, especially in the case of a carcass 2 made of metallic carcass reinforcement members 2b in a cross bond (cf. Fig. 4A). In this case, the fourth step ST4 is omitted and, through the radial expansion of the construction drum 20 in the fifth step ST5, only the tire package 23 is adapted to the convexly curved shape of the outer surface 22 of the construction drum 20 by appropriate means.

[0115] In a sixth step ST6, at least one coil bandage reinforcement carrier 8b is provided, and a coil bandage 8 with one or more coil bandage layers 8a is then applied radially above the contoured or curved belt 7 (or, if the belt 7 is omitted, directly radially above the contoured or curved tire package 23 or the contoured or curved carcass 2). In this embodiment, the coil bandage 8 thus also conforms fully to the curved belt 7, the curved tire package 23, or the radially superior carcass 2 over its entire axial coil bandage extent A8, so that the coil bandage 8 is also adapted to the curved shape of the outer surface 22 of the construction drum 20.

[0116] The application of the coil bandage 8 is preferably carried out by winding one or more rubber strips G over an arbitrary coil head 26, as exemplified in Fig. Figure 6D shows that one or more coil bandage layers 8a are formed within the coil bandage 8. Accordingly, several coil bandage reinforcement carriers 8b, for example between three and five, are embedded in the respective rubber strip G. The rubber strip G therefore has a rubber strip width BG of, for example, between 3 mm and 10 mm, in particular between 4 mm and 7 mm. The winding of the rubber strips G can be done overlapping or butt-to-butt. It can also be provided that a single coil bandage reinforcement carrier 8b is wound onto the winding head 26 in one or more coil bandage layers 8a, in which case this coil bandage reinforcement carrier 8b is rubberized, i.e., encased in a rubber coating.

[0117] According to a further embodiment, which is preferably used in addition to the surface contoured construction drum 20, it is provided that the coil bandage reinforcement carrier(s) 8b are wound up in the area of ​​the tire zenith Z in such a way that a gap L with a certain gap width BL is formed between at least some of the axially adjacent windings aR of the coil bandage reinforcement carriers 8b, as shown in an enlargement in Fig. 3E and Fig. 3F is shown. This is comparable to the winding method of the coil bandage reinforcement carriers 8b in the side sections 8c of the coil bandage 8, as shown by Fig. 3D described. The gaps L are preferably located on both sides of the tire zenith Z over an axial extent of between 10% and 70% of the coil bandage extent A8, preferably in a symmetrical manner around the tire zenith Z.

[0118] According to Fig. In embodiment 3E, several coil bandage reinforcement carriers 8b are wound onto the rubber strips G. In this embodiment, the gap L is formed by advancing the coiling head 26 axially aR, winding adjacent rubber strips G with a gap width BL apart from each other. Therefore, a gap L does not form between every winding of the coil bandage reinforcement carriers 8b, but only between the axially outer and axially inner coil bandage reinforcement carriers 8b of axially adjacent rubber strips G. The gap width BL can be between 0.5 and 1.5 times the rubber strip width BG, but preferably between 3 mm and 10 mm.

[0119] According to Fig. 3F provides that a single coil bandage reinforcement carrier 8b is wound up, wherein a gap L with a specific gap width BL is preferably formed between each axially adjacent winding of the coil bandage reinforcement carrier 8b by a corresponding feed of the coiling head 26. The gap width BL can in this case be between 0.5 times and 2 times the coil bandage reinforcement carrier diameter D8b, i.e., the cord diameter DC of the coil bandage reinforcement carriers 8b designed as cords C or the filament diameter D10 of the coil bandage reinforcement carriers 8b designed as individual filaments 10.

[0120] In both designs, the gap width BL of all formed gaps L can be constant or decrease with increasing distance from the tire's apex Z. Such gaps L also allow for material and weight savings. Furthermore, they can reduce compression on the radially underlying layers.

[0121] The provided coil bandage 8 is constructed according to one of the respective embodiments as described above, i.e., with highly tensile-strength coil bandage reinforcement carriers 8b, which have an elongation at break D of between 2% and 6%, preferably between 3% and 5.5%, and particularly preferably between 3% and 5%. The respective coil bandage reinforcement carrier 8b is therefore, for example, made of a metallic material mM or a textile material tM, and the coil bandage 8 has an axial coil bandage extension A8, which, depending on the application, is greater than, less than, or equal to the first and / or second axial belt extension A71, A72.

[0122] The design and stranding of the coil bandage reinforcement carriers 8b must be adapted according to the respective embodiment to the material used for the coil bandage reinforcement carriers 8b and how much the finished tire blank 50R expands in the radial direction rR during subsequent molding into the vulcanization mold due to the action of pressure and temperature, since this radial expansion, as already described, has a tensile effect in the circumferential direction U on the coil bandage 8 or the individual coil bandage reinforcement carriers 8b.

[0123] In its simplest form, for small radial expansions during molding of, for example, 1% (relative to the radius of the tire blank 50R), a coiled bandage reinforcement carrier 8b can be selected which has a straight shape FG, as shown in Fig. Figure 2C is shown for a small first angle α1. The slight radial expansion of the tire blank 50R can be absorbed without damage by the respective coil bandage reinforcement carrier 8b in the form of tensile forces in the circumferential direction U, even if the respective coil bandage reinforcement carrier 8b runs at the small first angle α1 described above and / or has the elongation at break D described above of between 2% and 6%, preferably between 3% and 5.5%, particularly preferably between 3% and 5%. For further optimization, the gap L described above can additionally be formed between individual coil bandage reinforcement carriers 8b in the region of the tire zenith Z.

[0124] However, according to an alternative embodiment, it can also be provided that the individually wound rubberized coil bandage reinforcement carrier 8b or the multiple coil bandage reinforcement carriers 8b embedded in the wound rubber strips G run in a wave shape FW in the circumferential direction U, as exemplified in Fig. 2E is shown. The tensile forces in the circumferential direction U caused by the radial expansion on the coil bandage reinforcement carrier 8b then cause the wavelength WL of the coil bandage reinforcement carrier 8b to increase and the wave amplitude WA to decrease, i.e. the “wave” is pulled apart.

[0125] The coil bandage reinforcement carrier 8b thus approaches a straight shape FG with increasing radial expansion of the tire blank 50R during the forming process in order to absorb the increased tensile forces, whereby at this stage with an almost straight course a very high circumferential stiffness is present in the coil bandage 8, particularly when a small first angle α1 of between 0° and 5°, preferably between 0° and 4°, particularly preferably between 0 and 3°, most preferably from 0 to 2°, is selected for the coil bandage reinforcement carrier 8b.

[0126] Preferably, the waveform FW is selected with respect to its wavelength WL and wave amplitude WA such that, after completion of vulcanization, and in particular after molding, an almost straight shape FG is present or at least approximates one. This not only achieves the aforementioned very high circumferential stiffness but also enables the selection of a highly tensile-strength coil bandage reinforcement element 8b, even when a very small first angle α1 for the coil bandage reinforcement element 8b is chosen, between 0° and 5°, preferably between 0° and 4°, particularly preferably between 0° and 3°, and most preferably between 0° and 2°.

[0127] In principle, this design can also be combined with corrugated coil bandage reinforcement carriers 8b with the gap L described above between individual corrugated coil bandage reinforcement carriers 8b in the area of ​​the tire zenith Z in order to achieve reduced compression both centrally on the belt 7 and on the carcass 2.

[0128] In principle, for such coiled bandage reinforcement carriers 8b with a circumferential waveform FW U, a construction drum 20 that is planar and uncontoured on the outside 22 or less contoured in the axial direction aR can also be used. The increased radial expansion during molding, which can then amount to up to 4%, for example, can be compensated for by a waveform FW with a correspondingly selected wavelength WL and wave amplitude WA, in which, after completion of vulcanization, and especially after completion of molding, an almost straight shape FG is present or is approached. For optimal compensation, the gap L described above between individual corrugated coiled bandage reinforcement carriers 8b in the area of ​​the tire zenith Z can also be provided in an uncontoured construction drum 20.

[0129] In a seventh step, ST7, the remaining components, particularly the tread 6, are provided, and the tire blank 50R is assembled in subsequent steps. The completed tire blank 50R is then placed in a vulcanization mold 27 in an eighth step, ST8, and subsequently heated under pressure to create the final pneumatic tire 50 made of elastic rubber with its permanently bonded components and integrated tread pattern. The pneumatic tire 50 can then be removed from the vulcanization mold 27 in a ninth step, ST9, after vulcanization is complete.

[0130] The advantage of using a construction drum 20 that is already contoured in the axial direction aR is that, before the finished tire blank 50R is formed into the vulcanization mold 27, only a small gap S remains in the radial direction rR between the tire blank 50R and the vulcanization mold 27, as shown in Fig. 6E (dashed line representing the state with an uncontoured construction drum) is shown schematically. The individual components of the tire blank 50R were already adapted to the shape of the finished vehicle tire 50 during its construction via the convexly curved outer surface 22. In the subsequent vulcanization process, the heating during molding results in a minimized residual protrusion R in the radial direction rR, which corresponds to the gap S through which the components of the vehicle tire 50 yield, with this residual protrusion R preferably being in the range of 1% (relative to the radius of the tire blank 50R).

[0131] Such radial expansions around the remaining residual elevation R are generally still easily accommodated by the components used, in particular the carcass 2 made of metallic carcass reinforcement members 2b and, depending on the embodiment, also of coiled bandage reinforcement members 8b, which run at the first angle α1 of between 0° and 5°, preferably between 0° and 4°, particularly preferably between 0° and 3°, and most preferably from 0° to 2°, to the circumferential direction U. This is particularly advantageous for an embodiment of the vehicle pneumatic tire 50 in which highly tensile-strength coiled bandage reinforcement members 8b are used, as described above. In this case, the coil bandage reinforcement carriers 8b can only absorb a limited tensile force due to the greatly reduced compliance in the circumferential direction U, although this is usually sufficient with a residual elevation R in the range of 1% during the molding into the vulcanization mold 27.

[0132] As described, however, instead of or in addition to the contoured construction drum 20, a circumferentially U-shaped coiled bandage reinforcement carrier 8b can also be used to generate additional compliance even with a residual elevation R greater than 1%, whereby the waveform FW, with its wavelength WL and wave amplitude WA, is adapted as described to the residual elevation R or the gap S remaining before molding, so that after completion of vulcanization or even after molding, a largely straight course of the coiled bandage reinforcement carrier 8b results at the correspondingly selected first angle α1. The formation of the gap L can also be combined accordingly. Reference symbol list 1 inner layer 2 Carcass 2a Carcass layer 2b Carcass reinforcement 2c Edge areas of the carcass layer 2a 2d edge of the carcass ply 2a 2e Overlap area 2f Carcass high impact 2g radial upper end of the carcass high spot 2f 3 side wall 3a radial lower end of the side wall 3 4 bead area 4a Bead band 4b Apex 5 bead core 5a Top of bead core 5b Layers of the bead core 6 treads 7 belts 7a Belt position 7a1 first belt layer 7a2 second belt layer 7b Belt reinforcement 8 coil bandage 8a Coil bandage placement 8b Coil bandage reinforcement 8c Side sections of the coil bandage 8 9a first belt edge of the first belt layer 7a1 9b second belt edge of the second belt layer 7a2 10 Filament 11 strand 12 Shoulder section 13 spaces 20 construction drum 20S Shoulder area of ​​the construction drum 20 20Z Zenith of the construction drum 20 21 Drum axle 22 Outside of the construction drum 20 23 tire package 24 clamping device 25 Transfer facility 26 spool head 27 Vulcanization form 50 vehicle pneumatic tires 50R tire blank 100 tire assembly systems α1 first angle α2 second angle α3 third angle A2b Strength beam spacing A7 axial belt extension A71 first axial belt extension of the first belt layer 7a1 A72 second axial belt extension of the second belt layer 7a2 A8 axial coil bandage extension aR axial direction BG rubber strip width BL gap width C Cord D Elongation at break D2b Carcass Reinforcing Belt Diameter D8b coil bandage reinforcement carrier diameter D10 Filament Diameter DC cord diameter F Transition flank FG straight-line shape FW waveform G rubber strips H5b Layer height of layers 5b mM metallic material L gap L2c edge length R residual survey rA radial axis distance rR radial direction S gap tM textile material U circumferential direction WL wavelength WA wave amplitude Z Tire zenith QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] DE 10 2004 058 522 A1

[0007] WO 2023 / 090022 A1

[0008] JP 2023 544389 A

[0009] KR 102352893 B1

[0010] KR 20050094681 A

[0011] EP 1900549 A1

[0012] US 11179970 B2

[0013] JP 6798273 B2

[0014] KR 101467464 B1

[0015] US 5365988 A

[0016] JP 6538520 B2

[0017] CN 211663006 U

[0018] US 2019160874 A1

[0019] JP 2010095057 A

[0020] EP 1094956 B1

[0021] DE 4208705 A1

[0022] KR 100976580 B1

[0023] GB 770673 A

[0024] CN 114056007 A

[0024] WO 2018 / 125181 A1

[0024] US 5058649 A

[0025] KR 100187594 B1

[0025] US 5524688 A

[0025] WO 2019105620 A1

[0025] EP 661 / 2009

[0037]

Claims

[1] Vehicle pneumatic tire (50) for passenger cars and / or light commercial vehicles, comprising a tread (6), a carcass (2) and a coiled bandage (8) consisting of one or more than one coiled bandage layer (8a) with an axial coiled bandage extension (A8), wherein - the coil bandage (8) is arranged radially (rR) above the carcass (2) and radially (rR) below the tread (6) and the coil bandage (8) has at least one coil bandage reinforcement carrier (8b), and - the carcass (2) has at least one carcass ply (2a), wherein each carcass ply (2a) has at least one carcass reinforcement carrier (2b) and each carcass ply (2a) runs between bead areas (4) of the vehicle pneumatic tire (50), wherein at least one bead core (5) is arranged in each bead area (4) and each carcass ply (2a) is folded over the at least one bead core (5) in the respective bead area (4) so ​​that a carcass fold (2f) is formed, characterized by , that - in the carcass (2) at least one carcass reinforcement carrier (2b) made of a metallic material (mM) runs, - the bead core (5) has a teardrop-shaped cross-section and no apex (4b) is arranged radially above the bead core (5) between the bead core (5) and the carcass layer (2a), - the carcass high-profile cut (2f) runs radially below the sidewall (3), and - the vehicle pneumatic tire (50) has a load index in the range of 71 to 126. [2] Vehicle pneumatic tires (50) according to claim 1 characterized by , that the carcass high edge (2f) is arranged only within a bead band (4a) located radially below the side wall (3) to protect the bead area (4) from a rim. [3] Vehicle pneumatic tires (50) according to claim 1 or 2, characterized by , that a radially upper end (2g) of the carcass upturn (2f) lies radially below a radially lower end (3a) of the sidewall (3), wherein a length between a bead core top surface (5a) of the bead core (5) and the radially upper end (2g) of the carcass upturn (2f) is preferably between 10mm and 30mm. [4] Vehicle pneumatic tires (50) according to any one of the preceding claims, characterized by , that the respective bead core (5) has one of the following configurations in several layers (5b): 3-4-3-2-1, 3-4-5-4-3-2-1, 2-3-2-1, 4-5-4-3-2-1 or 3-4-5-4-3-2-1, so that the respective bead core (5) tapers radially outwards to form a teardrop shape. [5] Vehicle pneumatic tires (50) according to any one of the preceding claims, characterized by , that in the respective coil bandage position (8a) of the coil bandage (8) at least one coil bandage reinforcement carrier (8b) with an elongation at break (D) of between 2% and 6%, preferably between 3% and 5.5%, particularly preferably between 3% and 5%, runs. [6] Vehicle pneumatic tires (50) according to claim 5 characterized by, that the at least one coil bandage reinforcement carrier (8b) with an elongation at break (D) of between 2% and 6%, preferably between 3% and 5.5%, particularly preferably between 3% and 5%, runs at a first angle (α1) to the circumferential direction (U) within the respective coil bandage position (8a), wherein the first angle (α1) is between 0° and 5°, preferably between 0° and 4°, particularly preferably between 0° and 3°, most preferably from 0° to 2°. [7] Vehicle pneumatic tires (50) according to claim 5 or 6, characterized by , that the at least one coil bandage strength carrier (8b) with an elongation at break (D) of between 2% and 6%, preferably of between 3% and 5.5%, particularly preferably of between 3% and 5%, is made of a textile material (tM), in particular aramid, and / or of a metallic material (mM), in particular steel. [8] Vehicle pneumatic tires (50) according to any one of the preceding claims, characterized by, that the coil bandage (8) comprises exclusively coil bandage reinforcement carriers (8b) with an elongation at break (D) of between 2% and 6%, preferably of between 3% and 5.5%, particularly preferably of between 3% and 5%, and / or the carcass (2) comprises exclusively carcass reinforcement carriers (2b) made of a metallic material (mM), preferably steel. [9] Vehicle pneumatic tires (50) according to any one of the preceding claims, characterized by , that the vehicle pneumatic tire (50) further comprises a belt (7) which is radially covered on the outside by the coil bandage (8) and the belt (7) has one, two or three belt layers (7a; 7a1, 7a2), wherein the belt (7) has at least one belt reinforcement carrier (7b). [10] Vehicle pneumatic tires (50) according to claim 9, characterized by, that in each belt layer (7a) of the belt (7) at least one belt reinforcement member (7b) made of a metallic material (mM), in particular steel, runs, preferably exclusively belt reinforcement members (7b) made of a metallic material (mM), in particular steel. [11] Vehicle pneumatic tires (50) according to claim 9 or 10, characterized by , that the belt (7) has two or three belt layers (7a; 7a1, 7a2), wherein in each belt layer (7a; 7a1, 7a2) at least one belt reinforcement member (7b) is arranged, which runs at a second angle (α2) to the circumferential direction (U), wherein the second angle (α2) is between 35° and 55°, and the belt reinforcement members (7b) of radially superimposed belt layers (7a; 7a1, 7a2) have opposite slope directions, so that belt reinforcement members (7b) superimposed in radial direction (rR) cross over each other to form a cross-shaped structure. [12] Vehicle pneumatic tires (50) according to one of claims 9 to 11, characterized by , that the coil bandage (8) has an axial coil bandage extension (A8), - which is larger than an axial belt extension (A7) of the belt (7), or - which is less than or equal to a first axial belt extension (A71) of a first belt layer (7a1) of the belt (7), and / or - which is larger than a second axial belt extension (A72) of a second belt layer (7a2) of the belt (7), or - which is less than or equal to the second axial belt extension (A72) of the second belt layer (7a2) of the belt (7), wherein the coil bandage (8) covers a tire zenith (Z) of the vehicle pneumatic tire (50). [13] Vehicle pneumatic tire (50) according to any one of the preceding claims, characterized by, that the carcass reinforcement elements (2b) in the at least one carcass layer (2a) of the carcass (2) run at a third angle (α3) to the circumferential direction (U), wherein - the carcass (2) comprises at least two carcass plies (2a), each carcass ply (2a) comprising at least one carcass reinforcing layer (2b) made of a metallic material (mM), wherein the respective carcass reinforcing layer (2b) extends at a third angle (α3) of between 40° and 50°, preferably 45°, to the circumferential direction (U), and the carcass reinforcing layers (2b) of radially superimposed carcass plies (2a) have opposite slope directions, such that carcass reinforcing layers (2b) superimposed in the radial direction (rR) intersect to form a cross-laminated structure, or - the carcass (2) has only one carcass layer (2a), wherein the carcass layer (2a) has at least one carcass reinforcement carrier (2b) made of a metallic material (mM), wherein the carcass reinforcement carrier (2b) extends at a third angle (α3) of greater than 70° and less than or equal to 90° to the circumferential direction (U). [14] Vehicle pneumatic tire (50) according to any one of the preceding claims, characterized by, that gaps (L) with a gap width (BL) are arranged between at least some axially adjacent windings (aR) of the at least one coiled bandage reinforcement carrier (8b) with an elongation at break (D) of between 2% and 6%, preferably between 3% and 5.5%, particularly preferably between 3% and 5%, wherein the gap widths (BL) of the gaps (L) are identical or the gap widths (BL) change with increasing axial distance of the respective gap (L) to a tire zenith (Z) of the vehicle pneumatic tire (50), wherein the gap widths (BL) are, for example, between 0.5 times and 2 times a coiled bandage reinforcement carrier diameter (D8b) of the coiled bandage reinforcement carriers (8b) when the at least one provided coiled bandage reinforcement carrier (8b) is wound individually, or the Gap widths (BL), for example, between 0.5 times and 1.5 times the width (BG) of a rubber strip (G),preferably between 3 mm and 10 mm, when the at least one provided coil bandage strength carrier (8b) is embedded in the rubber strip (G). [15] Vehicle pneumatic tires (50) according to claim 14, characterized by , that - the gap widths (BL) become larger when the gaps (L) are arranged in side sections (8c) of the coil bandage (8) with increasing axial distance of the respective gap (L) to the tire zenith (Z), and / or - the gap widths (BL) become smaller with increasing axial distance to the tire zenith (Z) when the gaps (L) are arranged in the area of ​​the tire zenith (Z), preferably over an axial extent of between 10% and 70% of the coil bandage extent (A8) around the tire zenith (Z).

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