Vehicle pneumatic tires with belt straps

Description

[0001] The subject of the patent application is a pneumatic vehicle tire with a belt consisting of at least one steel cord belt layer running around the circumference of the tire and a bandage which lies radially outwardly against the belt over the entire circumference of the tire, wherein the bandage consists of a rubber strip in which two to six cords of reinforcing fibers are contained, and this rubber strip is wound around the belt at least from one axial end of the belt to at least the other axial end of the belt in a winding direction relative to the circumferential direction of the pneumatic vehicle tire, wherein the ratio of the component of the winding direction in the axial direction to the component of the winding direction in the circumferential direction along the rubber strip is less than 0.01 and does not vary by more than 2% over at least 70% of the width of the belt in the axial direction.

[0002] Furthermore, the patent application relates to a manufacturing process by which a pneumatic vehicle tire is manufactured with a belt consisting of at least one steel cord belt layer running around the circumference of the tire and a bandage which lies radially on the outside of the belt over the entire circumference of the tire. State of the art

[0003] Pneumatic vehicle tires with a circumferential belt with steel cords that extends across at least almost the entire width of the pneumatic vehicle tire have been known for 100 years. The belt has at least one steel cord belt layer. In the matrix of the belt layer, a rubber material, the steel cords are preferably arranged parallel to one another in a plane. The steel cords consist of steel wires that are usually twisted together and predominantly coated, e.g. with brass and rubber. In the pneumatic vehicle tire, the belt with the steel cords increases the stability of the tread of the pneumatic vehicle tire, particularly through its stiffness. The tread is arranged on the outside of the surface of the pneumatic vehicle tire as seen in the radial direction from the belt. Accordingly, the tread of the pneumatic vehicle tire has low rolling resistance, less mobility of its tread blocks, and less material wear.The driving behavior of the vehicle equipped with such a pneumatic tire also benefits from this through better driving stability, better steering precision and reduced slip.

[0004] The belt of such a pneumatic vehicle tire consists of at least one steel cord belt layer running around the circumference of the tire.

[0005] The belt can consist of only one steel cord belt layer running around the tire's circumference. In this case, the direction of the steel cords in the steel cord belt layer, which then have a 0° winding, deviates little or not at all from the circumferential direction of the pneumatic vehicle tire. Typically, the direction of the steel cords in the steel cord belt layer deviates by no more than 3° from the circumferential direction, preferably no more than 1° from the circumferential direction, and particularly preferably no more than 0.3° from the circumferential direction.

[0006] The belt can also consist of two steel cord belt layers running around the circumference of the tire, wherein the direction of the steel cords in both belt layers deviates from the circumferential direction of the pneumatic vehicle tire by a specific angle, which is typically between 0° and 45°, preferably between 26° and 36°. However, the steel cords point to different sides of the pneumatic vehicle tire, so that the direction of the steel cords in relation to the axial direction A points in the opposite direction to each other in both belt layers. The steel cords in the two belt layers lying one above the other in the radial direction of the pneumatic vehicle tire deviate from the circumferential direction of the pneumatic vehicle tire by a specific angle, wherein the angles typically deviate from each other by up to a maximum of 2°, preferably a maximum of 0.5°.Because the steel cords point in opposite directions to the axial direction A in both belt layers, they stabilize the pneumatic vehicle tire on the one hand in its circumferential direction, but at the same time in its axial direction A or its width, because each layer of steel cords in each belt layer simultaneously increases the stability of one of the sides of the pneumatic vehicle tire. The axial direction A indicates the position of the straight line in space around which the pneumatic vehicle tire rotates and thus also the straight line to which the pneumatic vehicle tire is essentially rotationally symmetrical. In principle, every straight line has two directions in space along which one can move. In Cartesian coordination, these are usually referred to as the + and - directions.The radial direction of the pneumatic vehicle tire is then the radial direction in space known from the cylindrical coordinates, which is perpendicular to the axial direction A and with which the distance from the axial direction increases. The two belt layers are then arranged one above the other in the radial direction and have a different distance from both the axis A of the pneumatic vehicle tire and its surface. Both belt layers are usually arranged in the circumferential direction of the pneumatic vehicle tire, which corresponds to the circumferential direction of the cylindrical coordinates. In general, the structure of a vehicle tire can best be described with cylindrical coordinates and the spatial directions used in them due to its fundamental rotational symmetry.

[0007] Preferably, pneumatic vehicle tires having a circumferential belt with steel cords also have a bandage that rests radially, i.e., in the radial direction, on the outside of the belt over the entire circumference of the tire. "Outside" refers to the radial direction in which the distance from the axial direction A of the pneumatic vehicle tire increases, or in which the distance from the surface of the tread of the vehicle tire decreases.

[0008] Such a bandage, which lies radially outward against the belt over the entire circumference of the tire, consists of one or more rubber strips containing at least one cord of reinforcing fibers wound radially outward around the belt of the pneumatic vehicle tire. This bandage is preferably used for high-speed tires. In particular, at high speeds, pneumatic vehicle tires are subjected to high outward forces, the centrifugal forces. To counteract this expansion of the pneumatic vehicle tire, the bandage stabilizes the tire with the reinforcing fiber cords contained in its rubber strips. The cords are wound circumferentially around the belt of the pneumatic vehicle tire for optimal effectiveness.Accordingly, the cords in the rubber strips are usually arranged longitudinally in a plane at equal distances from one another to achieve a uniform reinforcing effect across the entire width of the pneumatic vehicle tire. Therefore, the bandage should extend in the axial direction at least from one axial end of the belt of the pneumatic vehicle tire to at least the other axial end of the belt. Advantageously, the bandage extends beyond the ends of the belt in the axial direction A.

[0009] Polymer fibers, especially nylon or aramid fibers, but also polyester fibers, can be used as reinforcing fibers in the bandage cords. Viscose fibers (rayon) can also be used. Typically, a cord consists of 100–300 nylon fibers or 700–1300 aramid fibers, preferably 140–280 nylon fibers or 900–1100 aramid fibers.

[0010] The bandage, and in particular the reinforcing fibers it contains, prevents or at least reduces the radial expansion of a pneumatic vehicle tire at high speeds. This prevents or at least reduces the size of the pneumatic vehicle tire in the radial direction. This is particularly critical in the shoulder area of ​​the pneumatic vehicle tire, where the belt of the pneumatic vehicle tire ends. The size increase of the pneumatic vehicle tire leads to an uneven and, above all, reduced contact area of ​​the tire on the road as well as uneven tire wear. In the shoulder area of ​​a pneumatic vehicle tire, large lateral forces also act during driving, so that an increase in the shoulders impairs power transmission.

[0011] There are various methods for attaching a bandage to the belt of a pneumatic vehicle tire. Typically, the belt is first positioned on the outside of a rotating drum, with the belt layers positioned so that their steel cords are positioned circumferentially around the drum in the same way as they will later be in the circumferential direction of a finished pneumatic vehicle tire. The belt can be secured to the rotating drum using magnets, which then attract the steel cords in the belt and hold it in place.

[0012] The rubber strips of the bandage are then wound around the belt by positioning the rubber strips on the belt, rotating the rotating drum and winding the rubber strips around the belt as the drum rotates. For this purpose, a feed device is required which feeds the rubber strips to be wound onto the rotating drum. A feed device can in particular be a feed head through which the rubber strip is moved to the rotating drum by means of a drive. In order for the rubber strip to be wound across the entire width of the pneumatic vehicle tire, the feed device must move relative to the rotating drum. The feed device preferably moves along an axis which is parallel to the axial direction A of the rotating drum. In the finished pneumatic vehicle tire, this axial direction A then corresponds to the axial direction A, to which the tire is rotationally symmetrical and around which it rotates.

[0013] When wrapping the bandage around the belt, it is important that the bandage is wrapped evenly around the belt to ensure that the bandage stabilizes the vehicle's pneumatic tire evenly and, for example, counteracts growth across the entire width of the tire at high speeds. This means that one or more of the rubber strips are not wrapped on top of each other, i.e. there are no multiple strips in the radial direction of the tire. This would cause the height of the tire to vary across its width and could, for example, lead to vibration behavior and imbalances around the circumference of the tire. Likewise, the rubber strips should not be laid down during wrapping in such a way that there are excessive gaps between adjacent sections of the wound rubber strip.

[0014] Particularly for the economic reason of fast and therefore cost-effective production, two rubber strips are often wound onto the belt simultaneously using two feed heads, also called winding heads. The rubber strips often have a large number of parallel cords made of reinforcing fibers. Typically, a rubber strip then has 4 to 12 cords with a typical width of 4 to 15 mm. However, it is also possible to use this process to wind rubber strips with just one cord or 2 or 3 cords, as well as rubber strips with more than twelve cords. Winding with two feed heads can be done in such a way that the winding of one rubber strip begins at one end of the belt and a second rubber strip is wound in the middle of the belt.During the winding of the rubber strips, both feed heads then move, usually parallel to each other, along one or two axes that run parallel to the axial direction A of the rotating drum until the first rubber strip reaches the middle of the belt and the second rubber strip reaches the other end of the belt. In another process with two feed heads, the winding of the rubber strips begins at both ends of the belt and the feed heads then move towards each other on one or two straight lines parallel to the axial direction A of the rotating drum until the belt is wrapped across its entire width with the two rubber strips. In another process, the winding of the two rubber strips with two feed heads begins in the middle of the belt and the feed heads then move to both ends of the belt on one or two straight lines parallel to the axial direction A of the rotating drum.

[0015] Because two rubber strips are wound in the process, there is always an area in the axial direction A of the rotating drum after the winding process in which both rubber strips are present. Since the accuracy of the winding control is limited and both rubber strips must have a slight inclination to the circumferential direction of the rotating drum during winding, there is a high risk that in the area mentioned where both rubber strips are present, the two rubber strips will overlap due to the winding process, i.e. lie one above the other in the radial direction or at least have a distance from each other over a small circumferential area that is greater than the distance during winding otherwise between adjacent sections of a rubber strip because there is a gap between the two rubber strips.

[0016] To avoid these problems, it is also possible to wind a single rubber strip around the belt fixed on a rotating drum, which is fed to the drum by a single feed device. One such winding method is known, for example, from KR 20200037992 A1. In such a method, the rubber strip is wound around the belt from at least one axial end of the belt to at least the other axial end of the belt in a winding direction relative to the circumferential direction of the belt fixed on the rotating drum. During winding, the rubber strip is subjected to a low tensile force, typically starting at 5 N, but often in the order of magnitude of 10 to 20 N. In the edge region of the belt, even higher tensile forces are sometimes exerted on the rubber strip during winding. This is typically exerted by the feed device.Since a rubber strip is now wrapped around the belt across its entire width, the risk of the rubber strip slipping off the belt during the wrapping process increases, as the process takes longer and each wrapped rubber strip is significantly longer. This risk naturally increases with the tensile force exerted on the rubber strip during wrapping. It is therefore essential to carry out this wrapping process in a highly controlled manner to guarantee the quality of the wrapping. This problem becomes more critical when the belt and the bandage wrapped around it are to be used in a tire subject to very high loads, i.e., very high speeds.In such UHP (Ultra High Performance) tires, any weakness caused by suboptimal winding becomes immediately noticeable at very high speeds, either through vibrations at very high vehicle speeds or an insufficient contact patch of the tire during braking at very high speeds. UHP tires are particularly required for vehicles with very high engine power, as well as sports and racing cars.

[0017] The stability of UHP tires can be further increased if the rubber tires can be wrapped around the belt under increased tensile force. It would be helpful if such wrapping were performed in the critical areas of the tire, especially the shoulders. The tensile force during wrapping then causes the bandage to adhere even more tightly to the belt, thus further preventing tire growth. However, with the wrapping processes known to date, wrapping under tensile force of 20 N to 100 N is only possible to a very limited extent, as the additional force causes the rubber strip to no longer adhere securely to the belt.

[0018] EP 3 085 818 A1 discloses a method for producing a high-speed passenger car tire. In this method, a wound bandage is wound onto a belt using two winding heads, with the pretension during winding varying between 5 N and 100 N. The resulting tire is said to have improved high-speed capability.

[0019] DE 10 2012 103 615 A1 discloses another method for producing a vehicle tire, in which a wound bandage is applied to a belt ply using at least two winding heads. Each winding head is guided from the center region of the belt assembly to the edges of the belt assembly, with the preload varying between 15 N and 100 N such that the vehicle tire has significantly higher structural rigidity on the inner shoulder side than on the outer shoulder side. This is intended to improve high-speed capability.

[0020] EP 2 987 649 A1 discloses a pneumatic vehicle tire with a carcass and a reinforcement layer made of resin-embedded cords located radially outside the carcass, instead of a conventional belt layer. To form the reinforcement layer, a resin-embedded cord is spirally wound onto the carcass. The tire is said to have improved stiffness.

[0021] US 2008 / 0087365 A1 discloses a pneumatic vehicle tire with a belted tire in which the tension of the cords initially decreases from the tire's equatorial plane toward the tire edges and then increases again toward the tire edges. This is said to be beneficial for tread wear, wet performance, and rolling noise.

[0022] WO 2006 / 032479 A1 also deals with a pneumatic vehicle tire with a belt bandage with a specific tension profile, which is said to be favorable for tread wear, wet performance and rolling noise.

[0023] JP 2000 326 419 A discloses a system for producing a pneumatic vehicle tire, which comprises a pressure roller and feed rollers. During production, a rubber strip containing a reinforcement is wound onto a drum, pressed down, and cut to length using a cutting device.

[0024] EP 0 453 220 A2, EP 0 288 609 A1, EP 1 318 006 A2 disclose further winding systems for the production of tire components.

[0025] DE 198 01 254 C1 and EP 1 769 944 A1 each disclose a further method for producing a pneumatic vehicle tire, wherein the method comprises a winding step.

[0026] It is therefore the object of the invention to provide a vehicle tire, a plant and a method for its production, in which the quality and safety of the UHP tires are increased by a better winding of the bandage around the belt. Summary of the invention

[0027] The problem is solved by a pneumatic vehicle tire according to patent claim 1.

[0028] This is a pneumatic vehicle tire with a belt consisting of at least one steel cord belt layer running around the circumference of the tire and a bandage that lies radially outwardly against the belt over the entire circumference of the tire, wherein the bandage consists of a rubber strip containing at least one cord of reinforcing fibers, and this rubber strip is wound around the belt from at least one axial end of the belt to at least the other axial end of the belt in a winding direction relative to the circumferential direction of the pneumatic vehicle tire, wherein the ratio of the component of the winding direction in the axial direction A to the component of the winding direction in the circumferential direction along the rubber strip is less than 0.01 and does not vary by more than 2% over at least 70% of the width of the belt in the axial direction A,whereby the distance between two adjacent cords in two adjacent sections of the rubber strip does not vary at any circumferential position by more than 5% compared to the distance between the cords in the rubber strip and the cords in the bandage are under a tension of at least 3 N / mm 2 over at least 25% of the width of the belt in the axial direction A.

[0029] As a UHP tire, such a pneumatic vehicle tire has both a belt with steel cords, consisting of at least one steel cord belt layer running around the tire's circumference, and a bandage that radially adheres to the belt on the outside over the entire tire circumference. In the pneumatic vehicle tire according to the invention, this bandage consists of a single rubber strip containing at least one cord of reinforcing fibers to counteract the radial expansion of the pneumatic vehicle tire at high speeds. The rubber strip is wound around the belt, at least from one axial end of the belt to at least the other axial end of the belt, almost in the circumferential direction of the pneumatic vehicle tire.

[0030] In the pneumatic vehicle tire according to the invention, the bandage therefore consists only of a rubber strip that is wound around the belt of the pneumatic vehicle tire almost parallel to the circumferential direction of the pneumatic vehicle tire. The winding must be guided around the belt at least over the entire width of the pneumatic vehicle tire in order to achieve uniform winding and to prevent radial expansion of the pneumatic vehicle tire across the entire tire width. Since the width of the pneumatic vehicle tire extends in the axial direction A of the pneumatic vehicle tire, whereby strictly speaking the width is parallel to the axis of rotation A of the pneumatic vehicle tire, the pneumatic vehicle tire also has axial ends in the axial direction A and accordingly also the belt of the pneumatic vehicle tire, which stabilizes the pneumatic vehicle tire in its radial direction and runs in the circumferential direction.In order to stabilize the belt of the pneumatic vehicle tire evenly by means of the bandage, the winding of the bandage by means of the rubber strip must run at least from one axial end of the belt to at least the other axial end of the belt, almost in the circumferential direction of the tire.

[0031] Accordingly, in a pneumatic vehicle tire according to the invention, the winding direction of the rubber strip relative to the circumferential direction of the pneumatic vehicle tire is such that the ratio of the component of the winding direction in axial direction A to the component of the winding direction in the circumferential direction along the rubber strip is less than 0.01 and varies by no more than 2% over at least 70% of the width of the belt in axial direction A. The direction of winding of the rubber strip therefore also has a very small component in axial direction A. This is necessary simply because the rubber strip of the bandage is less than the belt of the pneumatic vehicle tire. Accordingly, the rubber strip must be wound several times around the belt, offset in the axial direction, so that the bandage can extend from one axial end of the belt to at least the other axial end of the belt.Depending on the width of the rubber strip, there must already be an offset due to the component of the winding direction of the rubber strip in the axial direction A, which corresponds to the width of the rubber strip. In a pneumatic vehicle tire according to the invention, this component of the winding direction should nevertheless be very small and its ratio to the component of the winding direction in the circumferential direction should be less than 0.01. Accordingly, the winding direction of the rubber strip deviates from the circumferential direction only to such an extent that the offset of adjacent sections of the rubber strip, which are arranged almost next to one another in the axial direction A, is just given at every circumferential position. This winding direction, or more precisely its relative component in the axial direction A, should not vary by more than 2% over at least 70% of the width of the belt in the axial direction A, i.e. should be almost constant in the axial direction in this region.In general, the belt should be evenly wrapped with the rubber strip of the tire bandage across its entire width in axial direction A to prevent any tire growth caused by the bandage. Only by deforming, particularly bending, the belt and bandage of the green tire in the vulcanizing press during subsequent vulcanization of the pneumatic vehicle tire, during which the tire takes on the shape specified by the vulcanization mold, can this uniform arrangement often be altered in the shoulder areas of the tire, i.e., at the axial ends of the belt.It is therefore possible that in a tire according to the invention, after completion of its production, the ratio of the component of the winding direction of the rubber strip in the axial direction A to the component of the winding direction in the circumferential direction does not vary by more than 2% in the finished pneumatic vehicle tire over the entire width, but only in a smaller width of the belt in the axial direction, which, however, always amounts to at least 70% of the width.

[0032] A pneumatic vehicle tire according to the invention has such a good winding of the rubber strip of the bandage that the distance between two adjacent cords in two adjacent sections of the rubber strip varies at any circumferential position by no more than 5% compared to the distance between the cords in the rubber strip and the cords in the bandage are under a tension of at least 3 N / mm 2 over at least 25% of the width of the belt in the axial direction A. These two properties of the pneumatic vehicle tire according to the invention are essential for the quality and safety of a pneumatic vehicle tire according to the invention being increased compared to known UHP tires by the better winding of the bandage around the belt.Because even for two adjacent cords in two adjacent sections of the rubber strip, their spacing varies by no more than 5% at any circumferential position compared to the spacing of the cords in the rubber strip, a very homogeneous arrangement of the reinforcing fiber cords in the axial direction A of the pneumatic vehicle tire is achieved. Therefore, no local deviations can lead to a weak point in the pneumatic vehicle tire, which could cause local tire growth in the radial direction, which at very high vehicle speeds can cause vibrations or an insufficient tire contact area during braking, compromising the safety of the pneumatic vehicle tire at these critical moments.In addition, the increased tension of at least 3 N / mm 2 in the cords of the bandage ensures further stability of the pneumatic vehicle tire in the radial direction, so that any tire growth at high speeds and its resulting negative consequences are further reduced.

[0033] These properties of the pneumatic vehicle tires according to the invention are achieved in particular with the also claimed manufacturing plant for pneumatic vehicle tires and the also claimed associated manufacturing method for pneumatic vehicle tires.

[0034] In a preferred embodiment of the pneumatic vehicle tire according to the invention, the distance between two adjacent cords in two adjacent sections of the rubber strip varies at any circumferential position by no more than 2% compared to the distance between the cords in the rubber strip. More preferably, this distance varies by no more than 1% compared to the distance between the cords in the rubber strip, and most preferably, this distance varies by no more than 0.5% compared to the distance between the cords in the rubber strip. Due to the resulting even greater homogeneity of the arrangement of the cords of the reinforcing fibers, the local deviations of the stabilizing bandage are even smaller. Accordingly, the risk of a weak point in the pneumatic vehicle tire, which could lead to a safety-relevant problem, is further reduced.

[0035] In another preferred embodiment of the pneumatic vehicle tire according to the invention, the ratio of the component of the winding direction of the bandage in the axial direction A to the component of the winding direction in the circumferential direction varies by no more than 1% over at least 70% of the width of the belt in the axial direction A, preferably by no more than 0.5%, and particularly preferably by no more than 0.2%. This reduced deviation in the winding direction of the rubber strip of the bandage also further reduces the risk of local deviations in the stabilizing bandage and corresponding weak points in the pneumatic vehicle tire, which can lead to a safety-relevant problem.

[0036] In a further preferred embodiment of the pneumatic vehicle tire according to the invention, the cords in the bandage are under a tension of at least 3 N / mm 2 over at least 40% of the width of the belt in the axial direction A, preferably under a tension of at least 3 N / mm 2 over at least 60% of the width of the belt in the axial direction A and particularly preferably under a tension of at least 3 N / mm 2 over at least 80% of the width of the belt in the axial direction A. Due to the extended area of ​​the width of the pneumatic vehicle tire, in which the cords are under increased tension, the stability of a pneumatic vehicle tire according to the invention is further increased in the extended area, thereby further counteracting tire growth and its resulting consequences.

[0037] In another preferred embodiment of the pneumatic vehicle tire according to the invention, the cords in the bandage are under a tension of at least 12 N / mm 2< , preferably under a tension of at least 30 N / mm 2< and particularly preferably under a tension of at least 80 N / mm 2< , over at least 25% of the width of the belt in the axial direction A, preferably over at least 40% of the width of the belt in the axial direction A, particularly preferably over at least 60% of the width of the belt in the axial direction A and very particularly preferably over at least 80% of the width of the belt in the axial direction A. Due to the increased tension in the cords of the bandage, the pneumatic vehicle tires of this embodiment are also suitable for very high speeds, such as racing speeds and extreme speeds, without weak points in the pneumatic vehicle tire then leading to a safety-relevant problem.Here, the stabilization provided by the cords and the very uniform winding and arrangement of the cords work together structurally. These tire designs also withstand the stresses caused by the very high torques of an electric drive, especially in racing, such as Formula E.

[0038] InIn certain of these embodiments of a pneumatic vehicle tire according to the invention, the tension under which the cords in the bandage are subject fluctuates only insignificantly, i.e. only by a maximum of 5%, preferably only by 1% and preferably only by 0.3% over 25%, 40%, 60% or 80% of the width of the belt in axial direction A. As a result of this uniform winding under constant tension, any possible growth in size of the tire in the radial direction in axial direction A of the pneumatic vehicle tire is kept constant and thus an almost optimal contact patch of the pneumatic vehicle tire is made possible across the respective width of the pneumatic vehicle tire. This is particularly advantageous if the uniform winding in the two shoulder regions of the pneumatic vehicle tire is present with a high tension, so that optimal contact patches are not prevented by weak points, especially in these regions of the pneumatic vehicle tire which are rather unstable due to the ends of the belt and bandage.Here, a high-quality design of the bandage compensates for the weak point of the ending belt. Therefore, the cords of the bandage are preferably subjected to an increased tension of at least 12 N / mm 2 , preferably of at least 30 N / mm 2 , and particularly preferably of at least 80 N / mm 2 , in areas of at least 12.5% ​​and particularly preferably 20% of the width of the pneumatic vehicle tire in axial direction A near the two shoulder areas of a pneumatic vehicle tire according to the invention, where the belt and / or tread of the pneumatic vehicle tire merge into its sidewalls, which only fluctuates by a maximum of 5%, preferably only 1%, and preferably only 0.3% in these areas. Between these areas, the tension of the cords can be lower and / or fluctuate more.

[0039] In embodiments of the pneumatic vehicle tires according to the invention, the rubber strip is wound in one direction relative to the circumferential direction of the pneumatic vehicle tire such that the ratio of the component of the direction in the axial direction A to the component of the direction in the circumferential direction along the rubber strip over at least 85% of the width of the belt in the axial direction, preferably the entire width of the belt in the axial direction, varies by no more than 2%, preferably varies by no more than 1%, particularly preferably varies by no more than 0.5% and most preferably varies by no more than 0.2%. This even more uniform winding of the bandage results in an even better large contact area of ​​the pneumatic vehicle tire and minimal irregularities in the tread of the pneumatic vehicle tire.

[0040] In some embodiments of the pneumatic vehicle tire according to the invention, the rubber strip is wound in a winding direction relative to the circumferential direction of the pneumatic vehicle tire, in which the ratio of its component in the axial direction A to its component in the circumferential direction along the rubber strip is less than 0.005, preferably less than 0.002. Accordingly, the cords in the bandage of the pneumatic vehicle tire are aligned particularly precisely in the circumferential direction, which leads to even better stabilization of the pneumatic vehicle tire. Such a small ratio is possible above all when the width of the wound rubber strip is not so large, e.g., only a maximum of 6 mm, preferably a maximum of 4 mm, and particularly preferably a maximum of 3 mm, or the number of cords in the rubber strip is rather small, so that no more than 6 cords, preferably no more than 4 cords, and particularly preferably no more than 2 cords are present in the wound rubber strip.

[0041] Pneumatic vehicle tires according to the invention are characterized in particular by the fact that, in the region of the optimized winding of the bandage, all cords of the bandage lie next to one another in a very orderly manner in the axial direction A. Overlapping of the cords is excluded. Accordingly, the cords all have as equal a position as possible in the radial direction. Accordingly, in the pneumatic vehicle tires according to the invention, the distance in the radial direction between two cords of two adjacent sections of the rubber strip is typically no greater than 5% of the distance between the cords in the rubber strip, preferably no greater than 1% of the distance between the cords in the rubber strip, if the rubber strip is wound in a specific region in the axial direction A of the pneumatic vehicle tire in a direction relative to the circumferential direction of the pneumatic vehicle tire, in which the ratio of its component in the axial direction A to its component in the circumferential direction is less than 0.01 and varies by no more than 2%.

[0042] Typically, there is a uniform distance between the cords in the rubber strip of a pneumatic vehicle tire according to the invention, which distance is between 0.3 mm and 2 mm, preferably between 0.8 mm and 1.5 mm and particularly preferably between 1 mm and 1.3 mm and varies by a maximum of 3%, preferably by a maximum of 1.5% and particularly preferably by a maximum of 0.5%.

[0043] Furthermore, in a rubber strip of a pneumatic vehicle tire according to the invention, typically 2 to 15 cords are arranged next to one another, preferably 4 to 12 cords and particularly preferably 7 to 10 cords.

[0044] Typically, the at least one cord contained in the rubber strip of a pneumatic vehicle tire according to the invention consists of nylon fibers, aramid fibers, polyester fibers or rayon fibers.

[0045] Preferably, the at least one cord contained in the rubber strip of a pneumatic vehicle tire according to the invention consists of 100 - 300 nylon fibers or 700 - 1300 aramid fibers, wherein the fibers are preferably present as 2 to 5 yarns of the fibers in a cord, which are twisted, woven or braided in the cord.

[0046] Typically, the rubber material of the rubber strip of a pneumatic vehicle tire according to the invention contains carbon black as a filler. The rubber material of the rubber strip of a pneumatic vehicle tire according to the invention is usually an isotropic material. The rubber material is usually a covering of the cords, applied, for example, as a coating.

[0047] Preferably, the rubber strip of a pneumatic vehicle tire according to the invention is wound beyond the axial ends of the belt in the axial direction A, typically more than 5% of the width of the belt in the axial direction A beyond the belt end, preferably more than 10% of the width of the belt in the axial direction A beyond the belt end. This ensures that the stabilization of the belt by the bandage is truly achieved across the entire belt and, in particular, beyond its lateral ends. This measure also counteracts a potential weak point of a pneumatic vehicle tire in the shoulder area.

[0048] InIn preferred embodiments of the pneumatic vehicle tire according to the invention, the wound rubber strip of the bandage can have a further winding at at least one of its axial ends, which at least partially has the same position in the axial direction A as another winding of the rubber strip. Then, at the end of the wound rubber strip, a second winding of the rubber strip is deliberately placed at least partially over a first winding of the rubber strip in order to better secure the wound rubber strip at its axial end to prevent slipping.The area in which this further winding of the rubber strip is present does not belong to the at least 70% of the width of the belt in the axial direction A with the optimized winding of the rubber strip, in which the ratio of the component of the winding direction of the rubber strip in the axial direction A to the component of the winding direction of the rubber strip in the circumferential direction along the rubber strip is less than 0.01 and does not vary by more than 2% and wherein the distance between two adjacent cords in two adjacent sections of the rubber strip does not vary by more than 5% compared to the distance between the cords in the rubber strip at any circumferential position.

[0049] The belt of the pneumatic vehicle tires according to the invention can consist only of a steel cord belt layer running around the circumference of the tire, wherein the direction of the steel cords does not deviate by more than 3° from the circumferential direction of the pneumatic vehicle tire, preferably not more than 1° from the circumferential direction and particularly preferably not more than 0.3° from the circumferential direction.

[0050] The belt of the pneumatic vehicle tire according to the invention can consist of two steel cord belt layers running around the circumference of the tire, wherein the direction of the steel cords in both belt layers deviates from the circumferential direction of the pneumatic vehicle tire by the same angle for both steel cord belt layers up to a maximum of 2°, preferably a maximum of 0.5°, but the direction of the steel cords points in the opposite direction relative to the axial direction A for both belt layers. The steel cords of both belt layers are then arranged almost symmetrically to the circumferential direction of the pneumatic vehicle tire with a main component in the circumferential direction. Typically, the direction of the steel cords deviates from the circumferential direction by an angle of 0° to 45°. However, belts in which the direction of the steel cords deviates from the circumferential direction by an angle of 22° to 36° are preferred.

[0051] The problem is also solved by the manufacturing method according to patent claim 6.

[0052] This is a method for producing a pneumatic vehicle tire with a belt consisting of at least one steel cord belt layer running around the tire's circumference and a bandage that lies radially outwardly against the belt over the entire tire circumference, in which, in a manufacturing step, the bandage, which consists of a rubber strip containing two to six cords of reinforcing components, is wound externally onto the belt, which is positioned on a rotatable drum, wherein the rubber strip is fed to the drum by means of a feed device, the rubber strip is pressed against the outside of the belt by means of a pressing device during winding, and the fed rubber strip is wound up by the rotation of the rotatable drum, wherein the axial position of the feed head moves uniformly at least from one axial end of the belt to the other during winding, wherein the rubber strip is wound by a movement of the feed device along a movement axis Az parallel to the axial direction A of the rotatable drum in a winding direction relative to the circumferential direction of the rotatable drum, in which the ratio of its component in the axial direction A of the rotatable drum to the component of its direction in the circumferential direction is less than 0.01 and varies by no more than 2% over at least 85% of the width of the belt in the axial direction A, wherein by the rotation of the rotatable drum when winding the bandage around the belt, the rubber strip of the bandage is wound over at least 25% of the width of the belt in the axial direction under a tensile force of 10 N to 200 N, preferably under a tensile force of 50 N to 150 N and particularly preferably under a tensile force of 80 N to 120 N.

[0053] Preferably, the ratio of the component of the winding direction in the axial direction A to the component of the winding direction in the circumferential direction along the rubber strip over at least 85% of the width of the belt in the axial direction A varies by no more than 1%, particularly preferably by no more than 0.5% and most preferably by no more than 0.2%.

[0054] In particular, the pneumatic vehicle tires according to the invention can be produced using such a method.

[0055] A method according to the invention is used to produce a pneumatic vehicle tire which has a belt consisting of at least one steel cord belt layer running around the circumference of the tire and a bandage which lies radially outwardly on the belt over the entire circumference of the tire.

[0056] A manufacturing method according to the invention, in addition to other conventional steps in the production of a pneumatic vehicle tire, includes a manufacturing step in which a bandage is wound externally onto the belt. The bandage consists of a single rubber strip containing at least one cord of reinforcing fibers. Such a rubber strip can, of course, also comprise several cords arranged side by side in one direction, which are then equidistant from one another in this direction, up to certain tolerances. This direction runs perpendicular to the longitudinal direction of the rubber strip, and the cords extend in the longitudinal direction of the rubber strip.Accordingly, a rubber strip has a very long length, in the direction of which its cords run, a width, in the direction of which the cords are arranged next to each other, and a mostly small height, which is determined by the diameter of the cords and the rubber material surrounding them, which is often simply its rubber sheath.

[0057] Before the bandage winding step, the belt is positioned on a rotating drum. The rubber strip is fed to the drum during the production step by means of a feed device. The supplied rubber strip is wound onto the belt positioned on the rotating drum by the rotation of the rotating drum. During the winding process, the axial position of the feed head moves evenly at least from one axial end of the belt to the other. Furthermore, during the winding process, the rubber strip is pressed against the outside of the belt by means of a pressing device.

[0058] What is essential about the method according to the invention is that the rubber strip is additionally pressed against the belt located on the rotating drum by means of the pressing device during its winding.

[0059] This pressing of the wound rubber strip prevents it from moving from its position on the belt. Accordingly, the pressure roller ensures that a properly wound rubber strip remains in position until the end of the tire wrapping process. This prevents local deviations in the tire's winding, which can ultimately lead to weak spots in the finished pneumatic vehicle tire, causing vibrations at high and very high vehicle speeds or an insufficient tire contact patch during braking. Therefore, the improved wrapping process in the system according to the invention contributes to quality and safety, particularly for UHP tires.

[0060] Just as with the manufacturing systems according to the invention, the manufacturing methods according to the invention also have preferred embodiments that further improve the manufacturing process in order to produce even better pneumatic vehicle tires. The respective improvements are the same for the corresponding manufacturing systems and manufacturing methods. Therefore, they will no longer be explicitly mentioned in the context of the manufacturing methods; instead, reference is made to the corresponding embodiment of a manufacturing system with which an embodiment of the manufacturing method can be carried out.

[0061] In one embodiment of the manufacturing method according to the invention, the rubber strip is wound by a movement of the feed device along a movement axis Az parallel to the axial direction A of the rotatable drum in a winding direction relative to the circumferential direction of the rotatable drum, in which the ratio of its component in the axial direction A to its component in the circumferential direction is less than 0.01 over at least 95% of the width of the belt in the axial direction A, preferably the entire width of the belt in the axial direction, and does not vary by more than 2%, preferably does not vary by more than 1%, particularly preferably does not vary by more than 0.5% and most particularly preferably does not vary by more than 0.2%.

[0062] In another embodiment of the manufacturing method according to the invention, the rubber strip is wound by the movement of the feed device, the rotation of the rotatable drum, and the pressure of the pressure device such that the distance between two adjacent cords in two adjacent sections of the wound rubber strip varies at any circumferential position by no more than 5% compared to the distance between the cords in the rubber strip. The only exception to this is a previously described final winding of the rubber strip at its ends, which serves to secure it.Preferably, the distance between two adjacent cords in two adjacent sections of the wound rubber strip varies at each circumferential position by no more than 2% compared to the distance between the cords in the rubber strip, particularly preferably by no more than 1% compared to the distance between the cords in the rubber strip and most preferably by no more than 0.5% compared to the distance between the cords in the rubber strip.

[0063] In embodiments of the manufacturing method according to the invention, the tensile force under which the rubber strip is wound can vary by 10 N to 140 N, preferably by 50 N to 80 N, over at least 60% of the width of the belt in the axial direction A.

[0064] In one embodiment of the manufacturing method according to the invention, the rubber strip is wound around the belt under a tensile force of 50 N to 200 N in the region of the belt, which extends from an axial end of the belt to a region of the belt which, in the axial direction A, has a distance from this axial end of the belt of at least 10% of the width of the belt in the axial direction A, preferably which has a distance of at least 20% of the width of the belt in the axial direction A and particularly preferably which has a distance of 25% to 30% of the width of the belt in the axial direction A.

[0065] If the rubber strip is wound under a tensile force in the above-mentioned embodiments, this preferably fluctuates only by a maximum of 5%, particularly preferably only by 1% and most preferably only by 0.3%.

[0066] Preferably, in the above-mentioned embodiments of the manufacturing method according to the invention, the rubber strip is wound by a movement of the feed device along a movement axis Az parallel to the axial direction A of the rotatable drum in a winding direction relative to the circumferential direction of the rotatable drum, in which the ratio of its component in the axial direction A to its component of the direction in the circumferential direction is less than 0.005 and in particular less than 0.002.

[0067] In preferred embodiments of the manufacturing method according to the invention, the rubber strip is wound by the movement of the feed device to the rotatable drum and positioned on the belt by the pressing device such that the radial distance between two cords of two adjacent sections of the rubber strip is no greater than 5% of the distance between the cords in the rubber strip, preferably no greater than 1% of the distance between the cords in the rubber strip. The only exception to this is a previously described final winding of the rubber strip at its ends, which serves to secure it.

[0068] Typically, in the rubber strip wound on the belt in the manufacturing processes according to the invention, 2 to 15 cords are arranged side by side, preferably 4 to 12 cords and particularly preferably 7 to 10 cords.

[0069] Between the cords in a rubber strip wound on the belt in the manufacturing process according to the invention, there is a uniform distance which is typically between 0.3 mm and 2 mm, preferably between 0.8 mm and 1.5 mm and particularly preferably between 1 mm and 1.3 mm and varies by a maximum of 3%, preferably by a maximum of 1.5% and particularly preferably by a maximum of 0.5%.

[0070] In a rubber strip wound on the belt using a manufacturing method according to the invention, the at least one cord contained in the rubber strip usually consists of nylon fibers, aramid fibers, polyester fibers or rayon fibers.

[0071] In particular, the at least one cord contained in the rubber strip can consist of 100 - 300 nylon fibers or 700 - 1300 aramid fibers, wherein the fibers are preferably present as 2 to 5 yarns of the fibers in a cord, which are twisted, twisted or braided in the cord.

[0072] In some embodiments of the manufacturing method according to the invention, the feed device and the rotatable drum are moved towards each other during winding of the bandage such that the rubber strip is wound beyond at least one of the axial ends of the belt in the axial direction A of the rotatable drum over 5% of the width of the belt in the axial direction A of the rotatable drum, preferably over 10% of the width of the belt.

[0073] In other embodiments of the manufacturing method according to the invention, the feed device and rotatable drum are moved towards each other during winding of the bandage such that the rubber strip is additionally wound a further time at at least one of its axial ends, so that this winding and another of its windings have at least partially the same position in the axial direction A.

[0074] Belts on which the bandage is wound using a manufacturing method according to the invention can consist only of a steel cord belt layer running around the circumference of the tire, wherein the direction of the steel cords does not deviate by more than 3° from the circumferential direction of the rotatable drum when the belt is positioned on the rotatable drum, preferably not more than 1° from the circumferential direction and particularly preferably not more than 0.3° from the circumferential direction.

[0075] Belts on which the bandage is wound using a manufacturing method according to the invention can consist of two steel cord belt layers running around the circumference of the tire, wherein the direction of the steel cords in both belt layers deviates from the circumferential direction of the rotatable drum by the same angle for both steel cord belt layers up to a maximum of 2°, preferably a maximum of 0.5°, and the direction of the steel cords relative to the axial direction A of the rotatable drum points in the opposite direction for both belt layers when the belt is positioned on the rotatable drum. The steel cords of both belt layers are arranged almost symmetrically to the circumferential direction of the rotatable drum with a main component in the circumferential direction. Typically, the direction of the steel cords deviates from the circumferential direction by an angle of 0° to 45°.However, belts in which the direction of the steel cords deviates from the circumferential direction by an angle of 22 ° and 36 ° are preferred.

[0076] Typically, in the manufacturing processes according to the invention, a pressure roller, which is preferably made of a polymer material, is used as the pressing device that presses the rubber strip against the outside of the belt during winding.

[0077] The pressing device, in particular if it is a pressure roller, typically presses the rubber strip with a pressure of 0.15 N / mm 2< to 1 N / mm 2<, preferably a pressure of 0.18 N / mm 2< to 0.4 N / mm 2< and particularly preferably a pressure of 0.2 N / mm 2< to 0.3 N / mm 2< against the outside of the belt in a manufacturing method according to the invention during the manufacturing step of winding the bandage around the belt.

[0078] All embodiments of the pneumatic vehicle tires, manufacturing plants and manufacturing systems according to the invention presented in this description merely represent examples of the embodiment of the invention. Accordingly, individual or multiple features of an embodiment alone or the combination of the features provide different embodiments of further embodiments of the invention, which are the subject of the invention, unless explicitly explained otherwise in the description. Brief description of the drawings

[0079] The invention will be explained in more detail using several exemplary embodiments. They show: Fig. 1: System according to the invention for winding a bandage on a belt, view in the direction of the rotation axis A Fig. 2: System according to the invention for winding a bandage on a belt, view plane parallel to the rotation axis A Fig. 3: Image of a wound bandage as a developed section in the circumferential surface and cross-section parallel to the rotation axis A Fig. 4: Cross-section of a finished pneumatic vehicle tire according to the prior art with a winding error Fig. 5: Cross-section of a pneumatic vehicle tire according to the invention Fig. 6: Tensile force distribution in the axial direction of the rotation axis A of a uniformly wound bandage Fig. 7: Tensile force distribution in the axial direction of the rotation axis A of a bandage wound with higher tensile forces in the edge region of the belt Detailed description of the invention

[0080] In the Figures 1 and 2A schematic representation of an inventive system for producing a pneumatic vehicle tire is shown, in which a bandage is wound around a belt 10 of a pneumatic vehicle tire. A pneumatic vehicle tire manufactured using such a system has a belt consisting of at least one layer of steel cords surrounded by a rubber material, a steel cord belt layer. In the inventive system shown and in the associated inventive production method, the belt 10 is wound around a rotatable drum 1. This rotatable drum 1 rotates about its rotational axis A, the axial direction of the drum. The rotatable drum 1 is driven by a Figure 2shown drive 4. This drive 4 transmits rotation to the drum 1 via a rotary shaft. In addition to the belt 10, a pneumatic vehicle tire that is to be manufactured on a system according to the invention also has a bandage. This bandage lies radially on the outside of the belt 10. The belt 10 of the pneumatic vehicle tire runs around the entire circumference of the pneumatic vehicle tire. Accordingly, this is also the bandage. The pneumatic vehicle tire that is manufactured with the system according to the invention has a bandage that consists of a single rubber strip 20. In the inventive manufacturing step of the manufacturing method, this rubber strip 20 is now wound around the belt 10. In Figure 1 The already wound rubber strip 20 a is shown. However, this rubber strip is in the Figure 1only partially wound. Also shown in the production plant is a feed head 2. The rubber strip 20 is fed to the rotating drum 1 via this feed head 2. The rubber strip 20 is wound from the feed head 2 towards the rotating drum 1. When the beginning of the rubber strip 20 reaches the rotating drum 1 at the start of the winding process, the rubber strip 20 adheres to the belt 10. This is due to the different rubber materials from which the belt and rubber strip are made. It is important that reinforcing cords are embedded in both the belt 10 and the rubber strip 20. The cords of the belt 10 consist of steel cords 14. These cords are then coated with a rubber material to form a steel cord belt layer or several steel cord belt layers 11 and 12. In the rubber strip, on the other hand, there is at least one cord 24 made of reinforcing fibers.Because the rotatable drum 1 is set in rotation upon impact of the rubber strip 20, the rubber strip 20 is wound onto the belt 10, which is already located on the drum. However, this prior art technology has the problem that the wound rubber strip 20a can move out of position during the further winding process, and as a result, the winding predetermined by the position of the feed head is no longer precisely present. As already described above, a displacement of the wound rubber strip 20a leads to weak points in the pneumatic vehicle tires finished after further known process steps, which have a very negative impact, particularly at high vehicle speeds.In order to ensure the position of the wound rubber strip 20a during the winding process, a pressing device is used in the production plant according to the invention, by which the rubber strip 20a of the bandage is pressed against the belt 10 positioned on the drum. In the embodiment shown, the pressing device is a pressure roller 3. In . Figure 1 The rotational axis AA of the pressure roller 3 is also shown. The rotational axis AA of the pressure roller 3 and the rotational axis A of the rotating drum 1 run parallel. The pressure roller 3 exerts a certain pressure on the wound rubber strip 20a, which typically lies between 0.15 N / cm 2 and 0.4 N / cm 2. In particular, a pressure of 0.2 N / mm 2 to 0.3 N / mm 2 is often exerted by the pressure roller 3 on the already wound rubber strip 20a during production. Figure 3A typical winding pattern is shown, showing how a bandage is wound on the surface of the belt 10. The entire circumferential surface of the belt 10 is shown, in which this surface has been unwound onto a two-dimensional surface. Therefore, one can see the horizontal extension of the belt surface in the direction of the rotation axis A of the rotating drum 1 and, in the vertical direction, the circumferential direction of the belt 10 scaled in angles. Below this two-dimensional representation, there is a diagram that simply illustrates the positioning of the belt 10 and the wound rubber strip 20a relative to the rotation axis of the rotating drum 1. The exact position in the radial direction of the drum 1 is not shown. It can be seen that the belt 10 consists of a first steel cord belt layer 11 and a second steel cord belt layer 12. Furthermore, one can see from the representation of the Figure 3that the winding of the rubber strip 20 extends in the axial direction beyond the axial ends of the belt 10. From this winding pattern it can be seen how the rubber strip 20 is to be arranged as a wound rubber strip 20a on the belt 10 so that the pneumatic vehicle tire later manufactured with this composite of belt 10 and bandage is suitable as a UHP tire for very high speeds. With the method shown, a pneumatic vehicle tire according to the invention claimed for this application can be manufactured with a quality that was previously not possible. The wound rubber strip 20a shown in the exemplary embodiment has a width of 10 mm and has 9 nylon cords arranged next to one another in the width of the rubber strip, which cords have a diameter of 0.7 mm. The cords in the rubber strip 20 accordingly have a cord spacing of 1.111 mm.Typically, such rubber strips are manufactured by providing the cords with a rubber coating and then arranging them parallel to each other. The cords are positioned in the rubber strip such that two adjacent sections of the rubber strip also have a cord spacing between the adjacent cords of both sections that otherwise corresponds to the cord spacing in the rubber strip 20.

[0081] During the winding process in the winding system according to the invention, the feed head 2, which, as shown in Figure 1shown, is movable along an axis Az which runs parallel to the axis A of the rotatable drum, to one end of the belt in the axial direction and first positions the rubber strip 20 on the belt 10 which is positioned on the rotatable drum 1. First, as a securing measure for the wound rubber strip 20a, the rubber strip 20 is wound over a circumference directly in the circumferential direction of the rotatable drum 1 and thus of the belt 10. For this winding, the rotatable drum 1 is set in motion by the drive 4. After this first rotation, during which the wound rubber strip 20a is in an axial position which projects beyond the axial end of the belt 10, the feed head 2 starts moving along the direction of the axis Az.Due to this movement of the feed head 2, the rubber strip 20 is then no longer wound directly in the circumferential direction of the rotating drum 1, but in a winding direction that deviates slightly therefrom. The winding direction is selected such that with each revolution of the rotating drum 1, the feed head 2 moves by the width of the rubber strip 20a toward the other end in the axial direction of the belt 10. In the exemplary embodiment, therefore, the feed head 2 moves by 10 mm toward the other end of the belt 10 with each revolution of the rotating drum 1. As can be seen from FIG. Figure 3and the winding pattern shown there, this type of winding places a section of the rubber strip exactly next to the section of the rubber strip present after one revolution, so that across the entire width WG (belt width) of the belt 10 in the axial direction A, there is as little gap as possible and no overlap between the adjacent sections of the rubber strip. A permissible gap between adjacent sections of the wound rubber strip 20 A is less than 0.05 mm, preferably less than 0.02 mm, and particularly preferably less than 0.01 mm.In particular, the winding of the rubber strip 20 by the feed head 2 is carried out in such a way that the movement of the feed head 2 relative to the rotatable drum 1 across the entire drum width W is such that two cords located in two adjacent sections of the wound rubber strip 20a and adjacent to one another due to their edge position in the rubber strip 20 have almost the same distance as the cords in the rubber strip 20 itself. The distance between these adjacent cords in adjacent sections of the rubber strip 20a deviates by no more than 5% from the usual distance between the cords in the rubber strip 20. In order to achieve such precise winding of the wound rubber strip 20a and the cords 24 contained therein, it is necessary to prevent any movement of the rubber strip 20a after its winding.To ensure this, the inventive production plant for a pneumatic vehicle tire, which carries out the bandage winding process, additionally has the pressure roller 3. This pressure roller 3, which rotates about the rotation axis AA, which is parallel to the rotation axis A of the rotatable drum 1, rotates during the rotation of the drum 1. In doing so, it exerts a certain pressure on the already wound rubber strip 20a, which pressure is so great that slipping of the wound rubber strip 20a is no longer possible. The pressure exerted by the pressure roller 3, which is typically made of a polymer material, i.e. a plastic, on the wound rubber strip 20a is typically between 0.15 N / mm 2< to 1 N / mm 2< . In particular, pressures between 0.2 N / mm 2< to 0.3 N / mm 2< are preferably exerted by the pressure roller 3. The feed head 2 moves along the axis Az until it reaches the other end of the belt 10.Once the wound belt has reached a position in the axial direction A that extends beyond the axial end of the belt, a final additional wrap with the rubber strip 20 is made in the exemplary embodiment to secure the wound rubber strip 20a. During this final wrap, which occurs without further advancement of the guide head 2, an overlap of the already wound rubber strip 20a is accepted. As already mentioned, the use of the pressure roller 3 in the winding system, as shown in the . Figures 1 and 2 schematically shown that there are neither large distances between the wound sections of the wound rubber strip 20 a, nor an overlap of the rubber strip sections and the cords 24 contained therein. Such an overlap is in the Figure 4 to see. In the Figure 4A section through a pneumatic vehicle tire is shown, which was manufactured according to the current state of the art. In the sectional view, one can see the belt contained in the pneumatic vehicle tire shown with its steel cords 14. This belt consists of a first steel cord belt layer 11 and a second steel cord belt layer 12. Figure 4Above it, i.e. in the radial direction outside of it, you can see the bandage made of the wound rubber strip 20a wound around the belt 10. To be precise, the picture shows the cords 24, 24' made of reinforcing fibers of the bandage, which consists of one wound rubber strip, but can also consist of two wound rubber strips. It can be seen that the cords 24 and cords 24' overlap, i.e. they are located one above the other in the radial direction. In this case, the adjacent sections of the wound rubber strip 20a wound next to each other have overlapped during the winding process. If two rubber strips have been wound around the belt as a bandage, the overlap of the rubber strips and thus their cords 24, 24' can either have been intentional during the winding process or can occur due to fluctuations in the winding process.In any case, at this point where the cords 24 and 24' overlap, there is a weak point in the pneumatic vehicle tire, since the overlap creates an asymmetry in the tread 30 located above it in the radially outward direction, which has the profile shown. The overlap results in a radial elevation of the pneumatic vehicle tire in this area, which leads to a reduced contact area of ​​the pneumatic vehicle tire on the road: This area is also called the tire's contact patch. The reduction in the contact patch then leads to poorer braking performance of the pneumatic vehicle tire. In the . Figure 5A pneumatic vehicle tire according to the invention is now shown, wherein the sectional view shown again shows the belt 10 with two steel cord belt layers 11 and 12, as well as the rubber strip 20 with its cords 24 made of reinforcing fibers. Furthermore, the tread 30 of the pneumatic vehicle tire can be seen again. The tread 30 again has a profile. It can be clearly seen that the cords of the wound rubber strip 20a are arranged next to one another in the axial direction of the pneumatic vehicle tire and are very evenly spaced. Due to this very homogeneous structure of the cords 24, a pneumatic vehicle tire according to the invention does not have any major weak points, which have a very negative effect at high vehicle speeds, as described above.It can therefore be seen that the production according to the invention with the claimed production method, which takes place by means of the claimed production plant, results in a pneumatic vehicle tire, in particular a UHP pneumatic vehicle tire, whose bandage has such a high-quality winding that the quality and safety of the pneumatic vehicle tire are significantly increased. In the production method according to the invention, the winding of the rubber strip of the bandage takes place under a tensile force. This tensile force is usually at least 15 to 20 N. The tensile force is exerted on the rubber strip to be wound up preferably by the feed device, in the exemplary embodiment the feed head 2. In this, for example, a spring acting on a steering roller or another guide element exerts the force on the rubber strip 20 to be wound up.To increase the stability of a pneumatic vehicle tire, however, the rubber strip 20 of the bandage can also be wound with higher tensile forces. Depending on the tensile force applied during winding, the cords of the bandage in the finished pneumatic vehicle tire according to the invention then exhibit a tension to which they are subjected. In particular, due to an expansion of the manufactured bandage belt assembly during further production of the pneumatic vehicle tire in a vulcanizing press, the tension in the cords of the bandage is increased again compared to the tensile force applied to the cords in the wound rubber strip 20a during the winding process. Figures 6 and 7Two different tensile force distributions along the axial direction A of the rotating drum 1 and thus also the axial direction A of a pneumatic vehicle tire produced from it are shown as examples, according to which the winding of the bandage can be carried out under increased tensile forces. In each case, it is shown how the tensile force varies across the width of the belt 10. Here, the center of the belt is at the value 0. In the Figure 6 In the embodiment shown, the rubber strip 20 of the bandage is wound over the entire width of the bandage W, which in this example is 300 mm or slightly less, under a tensile force of 50 N. Alternatively, it is also conceivable that the winding takes place under a tensile force of, for example, 75, 100 or 150 N. In the Figure 7In contrast, a tensile force distribution is shown in which the tensile force is not constant across the entire width WG of the belt 10. Rather, in the edge regions of the belt 10, whose width WG is usually somewhat smaller than the tire width W, the rubber strip 20 of the tire is wound under a tensile force of 75 N over a width of 50 mm in the axial direction A. In the regions between these edge regions, the tensile force then decreases from 75 N to 15 N in the middle of the belt 10. Such a winding takes into account in particular that the shoulder region of a pneumatic vehicle tire proves to be a weak point, e.g. because the end of the belt of the pneumatic vehicle tire is located there. The increased tensile force during winding or the increased tension of the cords in the shoulder region in the manufactured pneumatic vehicle tire then prevents radial growth of the pneumatic vehicle tire at high speeds, particularly in the shoulder region. This allows the Figure 7The traction force distribution shown can be used especially for the production of UHP tires. As an alternative to the Figure 7 Due to the tensile force distribution shown, higher tensile forces can also act on the rubber strip 20 during winding, particularly in the shoulder area. The tensile forces can be up to 150 and, in particular, up to 200 N. The system according to the invention for producing pneumatic vehicle tires and the resulting manufacturing method according to the invention can increase the quality and safety of pneumatic vehicle tires. In particular, this system and the associated methods make it possible for the first time to produce the pneumatic vehicle tires according to the invention, meeting their very high requirements. List of reference symbols

[0082] 1 Rotating drum 2 Feed head 3 Pressure roller 4 Drive of the rotating drum 10 Belt 11 First steel cord belt layer 12 Second steel cord belt layer 14 Steel cord of the belt 20 Rubber strip 20 A Wound rubber strip 24, 24' Cords of the rubber strip 25 Further winding of the rubber strip 30 Tread of a pneumatic vehicle tire A Rotation axis of the rotating drum AA Rotation axis of the pressure roller Az Axial direction of the guide head W Tire width WG Belt width

Claims

1. Pneumatic vehicle tyre with a belt (10) consisting of at least one steel cord belt ply (11, 12), which encircles the tyre circumference, and a bandage which externally bears radially on the belt (10) over the entire tyre circumference, wherein the bandage consists of a rubber strip (20a) in which two to six cords (24) of reinforcement fibres are contained, and this rubber strip (20a) in a winding direction (25) relative to the circumferential direction of the pneumatic vehicle tyre is wound about the belt (10) at least from one axial end of the belt (10) up to at least the other axial end of the belt (10), wherein the ratio of the component of the winding direction in the axial direction (A) to the component of the winding direction in the circumferential direction along the rubber strip (20a) is less than 0.01, and does not vary by more than 2% over at least 70% of the width (WG) of the belt (10) in the axial direction (A), characterized in that the spacing of two neighbouring cords (24) in two adjacent portions of the rubber strip (20a) at each circumferential position does not vary by more than 5% in comparison to the spacing of the cords (24) in the rubber strip (20a), and the cords (24) in the bandage are subjected to a tension of at least 3 N / mm2 over at least 25% of the width (WG) of the belt (10) in the axial direction (A).

2. Pneumatic vehicle tyre according to Patent Claim 1, characterized in that the spacing of the two neighbouring cords (24)in two adjacent portions of the rubber strip (20a) at each circumferential position does not vary by more than 2% in comparison to the spacing of the cords (24) in the rubber strip (20a), preferably does not vary by more than 1% in comparison to the spacing of the cords (24) in the rubber strip (20a), and particularly preferably does not vary by more than 0.5% in comparison to the spacing of the cords (24) in the rubber strip (20a).

3. Pneumatic vehicle tyre according to Patent Claim 1 or 2, characterized in that the cords (24) in the bandage are subjected to a tension of at least 3 N / mm2 over at least 40% of the width (WG) of the belt (10) in the axial direction (A), preferably are subjected to a tension of at least 3 N / mm2 over at least 60% of the width (WG) of the belt (10) in the axial direction (A), and particularly preferably are subjected to a tension of at least 3 N / mm2 over at least 80% of the width (WG) of the belt (10) in the axial direction (A).

4. Pneumatic vehicle tyre according to Patent Claim 1 or 3, characterized in that the cords (24) in the bandage are subjected to a tension of at least 12 N / mm2, preferably are subjected to a tension of at least 30 N / mm2, and particularly preferably are subjected to a tension of at least 80 N / mm2 over at least 25% of the width (WG) of the belt (10) in the axial direction (A), preferably over at least 40% of the width (WG) of the belt (10) in the axial direction (A), particularly preferably over at least 60% of the width (WG) of the belt (10) in the axial direction (A), and most preferably over at least 80% of the width (WG) of the belt (10) in the axial direction (A).

5. Pneumatic vehicle tyre according to Patent Claim 1, 3 or 4, characterized in that over at least 25%, 40%, 60% or 80 % of the width (WG) of the belt (10) in the axial direction (A), the tension to which the cords (24) in the bandage are subjected fluctuates only by at most 5%, preferably fluctuates only by 1%, and particularly preferably fluctuates only by 0.3%.

6. Method for producing a pneumatic vehicle tyre with a belt (10) consisting of at least one steel cord belt ply (11, 12), which encircles the tyre circumference, and a bandage which externally bears radially on the belt (10) over the entire tyre circumference, in which method, in a manufacturing step, the bandage consisting of a rubber strip (20a) in which two to six cords (24) of reinforcement fibres are contained, is wound externally on the belt (10) which is positioned on a rotatable drum (1), wherein the rubber strip (20a) is fed to the drum (1) by means of a feed device (2); the rubber strip (20a) during winding is pressed onto the outside of the belt (10) by means of a contact pressure device (3), and the fed rubber strip (20a) is wound by the rotation of the rotatable drum (1), wherein the axial position of the feed device (2) during winding moves uniformly from at least one axial end of the belt (10) to the other; wherein the rubber strip (20a), as a result of a movement of the feed device (2) along a movement axis (Az) parallel to the axial direction (A) of the rotatable drum (1), is wound in a winding direction relative to the circumferential direction of the rotatable drum (1), wherein the ratio of the component of said winding direction in the axial direction (A) of the rotatable drum (1) to the component of the direction of said winding direction in the circumferential direction is less than 0.01, and does not vary by more than 2% over at least 85% of the width (WG) of the belt (10) in the axial direction (A); wherein, as a result of the rotation of the rotatable drum (1) when winding the bandage about the belt (10), the rubber strip (20a) of the bandage is wound at a tensile force of 10 N to 200 N, preferably at a tensile force of 50 N to 150 N, and particularly preferably at a tensile force of 80 N to 120 N, over at least 25% of the width (WG) of the belt (10) in the axial direction (A).