Belt layer and belt assembly for a vehicle tire and method for producing

Abstract

Belt ply and belt assembly for a vehicle tire and method for production. Belt ply (10, 10a, 10b) for a vehicle tire (30), wherein the belt ply (10, 10a, 10b) comprises strength members (13, 13a, 13b) embedded in a rubber mixture (11, 12), wherein the rubber mixture (11) is electrically non-conductive in a first section (1, 1a, 1b) of the belt ply (10, 10a, 10b). The rubber mixture (12) is electrically conductive in a second section (2, 2a, 2b) of the belt ply (10, 10a, 10b).

Description

The invention relates to a belt ply for a vehicle tire, wherein the belt ply comprises reinforcing members embedded in a rubber compound, wherein the rubber compound is not electrically conductive in a first portion of the belt ply.It is increasingly common to use low-rolling-resistance rubber compounds for reducing a rolling resistance of vehicle tires, wherein the low-rolling-resistance rubber compounds often have a higher specific electrical resistance than conventional rubber compounds. It is customary, for example, to use silica instead of carbon black as filler in a rubber mixture, as a result of which an advantageously low rolling resistance can be achieved, but a high electrical resistance can arise between the underlying surface of the road and the rim.It is thus true to produce electrical bridges in the vehicle tire, which must also overcome belt plies arranged between the underlying surface of the road and the rim, for example, if the belt plies have too high an electrical resistance. US 2011 / 0174420 A1 describes a pneumatic tire comprising a crown reinforcing belt formed by a plurality of reinforcing plies laid one above the other, each reinforcing ply resulting from the circumferential winding of one or more ply portions containing wires parallel to each other embedded in a weakly electrically conductive rubber compound, the sides of the circumferential ends of the portions being butt-joined to form a butt joint, an electrically conductive continuous linear element circumferentially encircling the radially upper part of each of the plies and transitioning from the radially upper part of a first reinforcing ply to the radially upper part of a second reinforcing ply directly overlying it by passing between the two sides of a butt joint of the second reinforcing ply.The invention is based on the object of providing a belt ply and a belt structure for a vehicle tire and a vehicle tire, wherein the belt ply is intended to contribute to the lowest possible rolling resistance and electrical resistance of the vehicle tire and wherein, in addition, a high strength is intended to be achieved. It is another object of the present invention to provide a method of manufacturing a belt ply in such a vehicle tire, which is intended to simplify the tire structure as a whole.The object set is achieved according to the invention in that the rubber mixture is electrically conductive in a second section of the belt ply.The invention solves the conflict of goals between a low rolling resistance and a sufficient electrical conductance at a high level and in a manner that is easy to scale industrially. The use of a continuous belt ply having conductive and non-conductive portions eliminates the need for complex multi-piece assemblies, thereby increasing the stability of the vehicle tire and efficiency of manufacture of the vehicle tire.If the directional designations are used axially, in the axial direction, radially, in the radial direction and in the circumferential direction, these refer to the vehicle tire which is mounted on a vehicle as intended and to its rolling movement which is carried out thereon. Herein, the radial direction refers to a direction perpendicular to the rotation axis of the vehicle tire and intersecting the rotation axis. Radially inward refers to the orientation facing the rotational axis in the radial direction. Radially outward refers to the orientation that faces away from the axis of rotation in the radial direction. The circumferential direction denotes the direction of a rolling movement about the axis of rotation. A front position on the vehicle tire in the circumferential direction passes earlier during a 180° rotation of the vehicle tire a minimum distance from the underlying surface than a rear position in the circumferential direction when the vehicle is travelling forward. The axial direction refers to a direction parallel to the rotation axis. Pointing axially inward refers to an orientation that faces axially toward a tire equatorial plane or a tire equatorial line. The tire equatorial plane is a plane perpendicular to the axis of rotation of the vehicle tire and passing through the center of the axial width of the vehicle tire, the tire equatorial line passing in the tire equatorial plane and on the surface of the vehicle tire. A transverse direction is a direction which consists of components of the radial direction and / or the axial direction. The described directional and position information can also be applied to a belt ply and / or to a belt dressing. The details are to be understood as absolute details with respect to a scenario according to which the belt ply or the belt structure is installed as intended in a vehicle tire. In the case of a separate belt ply or of such a belt bandage, the details relative to the belt ply or the belt bandage should be understood as if the belt ply or the belt bandage were installed in the vehicle tire as intended.The effects achieved with the features of the main claim are supported and further enhanced by preferred embodiments and configurations.A definition of an electrically conductive or non-electrically conductive rubber mixture is first to be formulated relative to the fact that a specific resistance after vulcanization is lower in the electrically conductive rubber mixture than in the electrically non-conductive rubber mixture. A boundary between electrically conductive and non-conductive rubber compound can be expressed in absolute numbers in that an electrically conductive rubber compound has a specific resistance of up to 1×10 12 Ω cm, preferably up to 1×10 7 Ω cm, and that an electrically non-conductive rubber compound has a specific resistance >1×10 12 Ω cm, in another embodiment >1×10 7 Ω cm, wherein the specific resistance of the electrically conductive rubber compound is smaller than that of the electrically non-conductive rubber compound. The large range of the specified limit values results, inter alia, from the possibility of varying the geometries of assemblies which can be used in a vehicle tire: the thicker the belt ply in the second section, for example, the lower the specific resistance of the conductive rubber mixture must be in order not to exceed a given resistance for overcoming the belt ply; the larger, for example, the contact area between the second section of the belt ply and further components of an electrical bridge through the vehicle tire, the greater the specific resistance of the conductive rubber mixture must be in order to be able to fall below a given resistance on a path between roadway and rim. Alternatively or additionally, the specific application of the invention can have effects on reasonable limit values for defining an electrically conductive or non-conductive rubber mixture. For example, the leakage resistance of a tire which is classified as conductive according to WDK Standard 110 / ISO 16392 must not exceed a value of 1×10 6 Ω; in this case, the electrically conductive rubber mixture preferably has a specific resistance of <1×10 7 Ω cm. For example, for the initial fitting of vehicles, for example on the European market, a limit value of the resistance between roadway and rim of 1×10 8 Ω is customary; in this case, the electrically conductive rubber mixture preferably has a specific resistance of <1×10 10 Ω cm. For example, the leakage resistance of a tire, which is classified as "dissipative" according to WDK Norm / ISO 16392, must not exceed a value of 1×10 10 Ω; in this case, the electrically conductive rubber mixture preferably has a specific resistance of <1×10 12 Ω cm.Preferably, the rubber mixture is characterized in the first section by a low hysteresis. Preferably, a better suitability for minimizing the rolling resistance of the vehicle tire is achieved with the rubber mixture in the first section than with the rubber mixture in the second section. In this way, the first section can be optimized for good rolling resistance and the second section for electrical conductivity, wherein the strength member running through both sections provides a continuously high strength in both sections. A suitable filler for the rubber mixture in the first section is silica.The reinforcing members in the belt ply may comprise steel and are preferably made of steel, apart from the rubber coating embedding them. The reinforcing elements can be embedded in the rubber mixtures in a manner known per se, for example by means of a calender.In a preferred embodiment of the belt ply, a boundary between the first portion and the second portion runs parallel to a course of the reinforcing members in the first portion and the second portion. If the reinforcing members extend, for example, at an angle between 18° and 32° with respect to the axial direction or the width direction of the belt ply, the boundary can extend over the entire width of the belt ply under the mentioned gradient. In this way, the strength of the belt ply is not impaired by interruptions of the reinforcing members. Furthermore, a belt ply with a corresponding boundary course can be produced particularly efficiently, as can be seen within the scope of the description of the method according to the invention before and / or below.The first section and / or the second section can each be configured in strip form, in the sense that they have a substantially constant width in the circumferential direction. The first portion may have a greater circumferential extension than the second portion. The circumferential extension of the first section can correspond to between 1 and 20 times, preferably between 2 and 10 times, the circumferential extension of the second section. In this way, a sufficient conductivity can be achieved and at the same time a very good rolling resistance can be maintained.The first portion of the belt ply may be circumferentially adjacent to a second portion of the belt ply on either side. The second portion of the belt ply may be circumferentially adjacent to a first portion of the belt ply on either side. This can be fulfilled in a belt ply having a single first and a single second section, wherein the first section would then adjoin the second section on both circumferential sides and vice versa. Alternatively, the belt ply may comprise a plurality of first and / or second portions having the features of the first and second portions respectively described in claim 1. According to one embodiment, the belt ply consists exclusively of such first and second portions. The belt ply may include a number n of first portions and a number m of second portions. In this case, the number n can correspond to a natural number between 1 and 30, preferably between 3 and 15, and / or the number m can correspond to a natural number between 1 and 30, preferably between 3 and 15. By providing the largest possible number of first portions distributed over the belt ply, a uniformly low rolling resistance can be achieved over the entire tire. By means of the largest possible number of second sections distributed over the belt ply, the number of possible conductivity bridges through the tire can be increased. A low total number of portions is again detrimental to the strength of the tire and simplifies the manufacture of the belt ply. In the ranges mentioned, good compromise can be found with regard to the above-mentioned disadvantages and disadvantages.The invention further relates to a belt structure for a vehicle tire. The belt dressing comprises at least one and preferably at least two of the belt plies according to the invention described above and / or below. In the case of a belt dressing comprising two or more belt plies according to the invention, the belt plies can be arranged one above the other in the radial direction, wherein the second section of a radially lower belt ply is in direct electrical contact with the second section of a belt ply arranged radially in each case directly above. In this way, an electrical bridge running in the radial direction through the belt structure can be formed.The strengthening members in the first belt ply may run at an opposite pitch to the strengthening members in the second belt ply. This corresponds to an arrangement known per se, which can be advantageous for a strength of the belt dressing. According to the invention, in combination with the cross-running reinforcing members, a synergistic advantage arises if a boundary between the first section and the second section in both belt plies also runs in each case parallel to the course of the respective reinforcing members: if two strip-shaped second sections in the first and second belt plies were to run at the same pitch, there would be more relative circumferential positions under which the two second sections would not overlap one another than in the case of strip-shaped sections running at opposite pitches.Second portions of the first belt ply and second portions of the second belt ply are in direct electrical contact with one another in a number of k mutually separated contact regions, wherein k preferably corresponds to a natural number between 1 and 100, more preferably between 2 and 10. In one embodiment, a second portion of the first belt ply is in contact with a second portion of the second belt ply, respectively. A contact region can correspond to the region of an overlap between two second sections. If the second sections each have a strip shape, a contact region in a surface spanned by the axial and circumferential directions can be diamond-shaped.At least one of the contact regions can be arranged completely within an axial distance of at most 30% of an axial width of the belt dressing from an axial center of the belt dressing. This preferably applies to all contact regions. More preferably, the axial center of the belt dressing intersects the at least one and preferably all contact areas. By arranging the contact regions in the vicinity of a tire equator, a proximity to a carbon center beam fundamentally known from vehicle tires can be produced, whereby the length of an electrical path through the tire can be reduced. In addition, by arranging the contact regions in an axially central region, it is possible to reduce the proportion of less suitable rubber mixtures of the second sections in the shoulder regions for optimizing a rolling resistance; in particular, strong heat development caused by hysteresis effects can occur in the shoulder regions at high speeds, which can be mitigated by the primary use of the rolling resistance-optimized rubber mixtures of the first sections.The invention also relates to a vehicle tyre having a belt ply and / or a belt structure as described above and / or below. Vehicle tires designed according to the invention are tires of any design, in particular radial tires, and tires of any type, in particular pneumatic vehicle tires for motor vehicles, such as passenger cars, light trucks or commercial vehicles.The vehicle tire may comprise a belt bandage, wherein the belt bandage may be arranged radially above the belt ply or the belt bandage. The belt bandage can comprise a first portion and a second portion, wherein the first portion is configured to be electrically non-conductive and wherein the second portion is configured to be electrically conductive. Preferably, the second portion of the belt bandage is in electrical contact with the second portion of the belt ply or with the second portion of one of the belt plies in the belt dressing. In this way, an electrical bridge can be made through the belt dressing and the belt bandage.The belt bandage can be designed as a wound bandage. A winding bandage is a belt bandage wound over the belt dressing from a length to be wound. The winding bandage can comprise reinforcing elements which pass through the length to be wound, preferably as cords which are continuous along the longitudinal direction of the length to be wound, and can consist, for example, of aramid, nylon, PET or mixtures of these materials. The wound length can extend at a greater absolute angle to the axial direction than the reinforcing elements of the belt plies. The second portion of the belt bandage may be axially bounded by two first portions of the belt bandage. The second portion of a first belt ply, the second portion of a second belt ply, and the second portion of the belt bandage may overlap one another. The second portion of the belt bandage can overlap with a plurality of, preferably with all, contact areas between the second portions of the belt plies.The vehicle tire may comprise an electrically non-conductive tread with an electrically conductive channel extending radially through the tread tire. An electrically non-conductive tread may comprise at least one of a cap and a base, each of which is based on an electrically non-conductive rubber compound alone. Preferably, both the cap and the base of the tread are optimized for low rolling resistance and in turn are both based on electrically non-conductive rubber compounds. The electrically conductive channel may extend from a tread at a radial top of the cap through the cap and the base to a radial bottom of the base and may extend over the entire perimeter of the vehicle tire. In particular, the electrically conductive channel can be designed as a carbon center beam known per se. The electrically conductive channel can electrically conductively contact the second portion of the belt bandage and in particular electrically conductively contact it in direct mechanical contact.The vehicle tire may include a sidewall, wherein the sidewall may be based on an electrically non-conductive rubber compound. The vehicle tyre may comprise a carcass, wherein the carcass may be based on an electrically conductive rubber compound. Overall, a continuous electrically conductive path may extend through the tread, the belt bandage, the belt dressing and the carcass. In the manner described, electric charge can be displaced and dissipated between a rim, which may be conductively connected to the carcass, and a roadway subsurface, which may be in contact with the electrically conductive channel through the tread. The electrically conductive subpaths between the second portion of a radially upper belt ply of the belt dressing and the underlying surface on the one hand, and between the second portion of a radially lower belt ply of the belt dressing and the rim on the other hand, can also be implemented using alternative structures. For example, the belt bandage and / or the carcass can be based on electrically non-conductive rubber mixtures, wherein electrically conductive paths can be produced, for example, with the aid of electrically conductive yarns.Overall, the specific resistances and dimensions of the assemblies defining the electrically conductive path between the roadway and the rim should be dimensioned such that the electrically conductive path has a resistance of less than 1×10 10 Ω, preferably of less than 1×10 8 Ω, more preferably of less than 1×10 6 Ω.The invention also relates to a method for producing a belt ply as described above and / or below. For this purpose, a first section and a second section are provided and then connected to one another.The first portion may be provided by separating the first portion from a first cord web at an angle between 5° and 85° to a course of the strengthening members in the first portion. This can be done on a production line of a manner known per se, wherein the cord cut can be done in a manner known per se by punching a first cord web at a predetermined angle into first sections, which each correspond to the axial width of the belt ply. The second portion can be provided by separating the second portion from a second cord web at an angle between 5° and 85° to a course of the reinforcing members in the second portion. Here, the second cord web may be punched at a predetermined angle into second portions each corresponding to the axial width of the belt ply.The second portion is preferably separated from the second cord track at the same angle as the first portion is separated from the first cord track. The second section is preferably provided with strengthening members aligned parallel to the strengthening members in the first section. The first and second cord webs can be unwound parallel to each other and cut to size with the same device. In particular, the first and second portions may be simultaneously severed from the respective cord tracks.The first portion and the second portion may be joined together by a splicing method. In particular, a plurality of first and second sections can be alternately joined together in a manner known per se by means of a splicing roll with an impact, so that an edge-straight endless belt is produced, which can be further processed, for example, to form the first and / or second belt ply.The method can be developed with further features which are described in connection with the vehicle tire according to the invention, the belt bandage according to the invention and / or the belt bandage according to the invention. The vehicle tire, the belt structure and / or the belt ply can be developed with further features which are described in connection with the method according to the invention. Vehicle tires, belt bandage and belt ply can each be developed with features described in connection with the two other products.The invention is described below by way of example with reference to the attached drawings on the basis of advantageous embodiments. The following are shown: FIG. 1 schematically shows an equivalent circuit diagram for an electrical path through an embodiment of a vehicle tire according to the invention, FIG. 2 schematically shows an embodiment of a first belt ply according to the invention, FIG. 3 schematically shows an embodiment of a second belt ply according to the invention, FIG. 4 schematically shows an embodiment of a belt dressing according to the invention, FIG. 5 schematically shows an embodiment of a belt dressing according to the invention with a belt bandage, FIG. 6 schematically shows a production line suitable for producing an embodiment of a belt ply according to the invention.FIG. 1 shows, as a schematic circuit diagram, an electrical path through a vehicle tire 30, between a roadway 38 and a rim 37. Each of the rectangles drawn in represents an electrical resistance of an assembly in the vehicle tire 30. A hook adjacent to a rectangle indicates that this assembly is based on an electrically conductive rubber compound, such that the assembly is a significant part of an electrical path through the vehicle tire 30.The vehicle tire comprises a running stiffener comprising a cap 31 and a base 32, wherein cap 31 and base 32 contain rubber mixtures optimized for rolling resistance, which are not electrically conductive. The tread 31, 32 is bridged by an electrically conductive channel 33, wherein the electrically conductive channel 33 can be designed, for example, as a carbon center beam 33, which radially bridges both the cap 31 and the base 32 electrically. A belt bandage 40 is divided into a first and a second section 41, 42, wherein the first section 41 is electrically non-conductive and contains a rubber mixture optimized for rolling resistance. The second section 42 is based on an electrically conductive rubber mixture and establishes an electrical connection between the carbon center beam 33 and a belt structure 20. The belt dressing 20 may comprise a plurality of belt plies 10, 10a, 10b. First sections 1, 1 a, 1 bof the belt plies 10, 10 a, 10 bare based on electrically non-conductive rubber mixtures 11; second sections 2, 2 a, 2 bof the belt plies 10, 10 a, 10 bare based on electrically conductive rubber mixtures 12.If the belt dressing 20 comprises a plurality of radially superposed belt plies 10 a, 10 b, the second portions 2 a, 2 bmay be arranged such that a radially continuous electrical connection is established between the belt bandage 40 and a carcass 34, wherein the carcass 34 is based on a conductive rubber mixture in the example shown. In the example shown, on the other hand, a side wall 35 is based on an electrically non-conductive rubber mixture optimized for rolling resistance. The carcass 34 provides an electrical bridge between the belt dressing 20 and an electrically conductive rim strip 36, which in turn is electrically conductively connected to the rim 37. Due to the embodiment according to the invention with first sections 1, 1 a, 1 band second sections 2, 2 a, 2 bof the belt plies 10, 10 a, 10 b, the belt structure 20 can contribute, on the one hand, to a low rolling resistance of the vehicle tire 30; on the other hand, an electrical bridge can be implemented in the belt structure 20 in a targeted manner, for example, according to the electrical path illustrated in FIG. 1.FIG. 2 schematically shows an embodiment of a first belt ply 10 aaccording to the invention. From left to right, the entire axial width of the belt ply 10 ais depicted, wherein the circumferential extension of the belt ply over 360° is depicted in the drawing plane from top to bottom. The axial direction and the circumferential direction are not shown in the actual scale ratio in the illustration, wherein the axial direction is shown greatly enlarged for the sake of better clarity. The belt ply 10 aincludes three strip-shaped second sections 2 aextending at an angle to the axial direction, which are based on a conductive rubber mixture 12. Without gaps adjoining the second sections 2 a, first sections 1 aare formed, which make up the remaining area of the belt ply 10 aand are based on a non-conductive rubber mixture 11 optimized for rolling resistance. The belt ply 10 aincludes in both sections 1 a, 2 aconformers 13 aarranged parallel to one another, the longitudinal course of which is indicated in FIG. 2 representatively at the boundaries between the sections 1 a, 2 a.FIG. 3 shows a view comparable to FIG. 2 of a second belt ply 10 b. The second belt ply 10 bis constructed with first sections 1 b, second sections 2 b, corresponding rubber mixtures 11, 12 and reinforcing members 13 bin principle identically to the first belt ply 10 a. However, the course of the reinforcing members 13 a, 13 band the boundary courses between the first portions 1 a, 1 band second portions 2 a, 2 bare formed substantially mirror-inverted in the first and second belt plies 10 a, 10 bin accordance with the embodiments shown. In alternative embodiments, the reinforcing members 13 a, 13 band boundary profiles in the two belt plies 10 a, 10 bmay likewise be formed so as to be crossed with respect to one another, but do not necessarily have to be mirrored with respect to one another.FIG. 4 shows the two belt plies 10 a, 10 bin accordance with FIGS. 2 and 3 radially stacked one above the other in a belt dressing 20. These contact regions 21 provide the belt dressing 20 with radially penetrating conductivity channels.FIG. 5 shows schematically and in a fragmentary manner the belt dressing 20 according to FIG. 4 with a belt bandage 40 arranged radially above it. the belt bandage 40 comprises a second section 42 which is based on an electrically conductive rubber mixture and two first sections 41 axially framing the second section 42 and each of which is based on an electrically non-conductive rubber mixture optimized for rolling resistance. In the example shown, the belt bandage 40 is designed as a winding bandage, wherein the pitch of the windings of the winding bandage corresponds to the marked limit profiles between the sections 41, 42. Because the second section 42 of the belt bandage 40 overlaps the contact regions 21 of the belt bandage 20, a radially continuous, electrically conductive path is ensured through the belt bandage 40 and the belt bandage 20, which path can be continued radially upward, for example by a carbon center beam 33 (cf. FIG. 1 ).FIG. 6 schematically shows a production line 50 on which the method according to the invention for producing a belt ply 10 can be carried out. At the entrance of the production line 50 there is arranged a reel 51 from which a first cord web 14 is unwound. In a manner known per se, an intermediate layer 53 which is released during unwinding of the cord web 14 and is intended for protecting and separating the individual windings of the cord web 14 is wound onto a idler roll 54. A second cord web 15 is unwound from the same or an additional reel 52, the second cord web 15 being shown shaded with curved lines for better distinguishability from the first cord web 14. The first and second cord webs 14, 15 are preferably unwound parallel to each other. The course of the reinforcing members 13 arranged in the cord tracks 14, 15 is only schematically shown in FIG. 6, with the aid of dashed lines, wherein the surface density of the reinforcing members 13 in the cord tracks 14, 15 will be greater in most embodiments than the density of the dashed lines in FIG. 6.In a punching station 55, the cord webs 14, 15 are punched into sections 1, 2, wherein the sections 1, 2 each have an axial width corresponding to the belt ply 10 to be produced. The cord tracks 14, 15 are severed at an angle different from 90° with respect to the course of the reinforcing members 13 in the cord tracks 14, 15, so that the respective shape of a parallelogram results for the sections 1, 2. The individual sections 1, 2 stamped in this way are then put together in an abutting manner at a splicing station 56, which is shown only schematically as a black box in FIG. 6, so that an edge-straight endless belt 61 is produced, which can be cut to form a first and / or second belt ply 10, 10 a, 10 band can be further processed.The sections 1, 2 are guided through the production line 50 in a manner known per se by means of conveyor belts 57. At the end of the production line 50, the composite tape 61 of sections 1, 2 is wound onto a cassette 58, an intermediate layer 59 for protecting and separating the individual coils being fed from a carrier 60.List of reference characters1 Belt ply first portion 1 afirst portion of the belt ply 1 bfirst portion of the belt ply 2 second portion of the belt ply 2 asecond portion of the belt ply 2 bsecond portion of the belt ply 10 belt ply 10 afirst belt ply 10 bsecond belt ply 11 rubber compound (non-conductive) 12 rubber compound (conductive) 13 reinforcing member 13 abending member in the belt ply 13 bbending member in the belt ply 14 first cord web 15 second cord web 20 belt structure 21 contact region 30 vehicle tire 31 cap (tread) 32 base (tread) 33 conductive channel (carbon center beam) 34 carcass 35 side wall 36 rim strip 37 rim 38 roadway 40 belt bandage 41 first portion of the belt bandage 42 second portion of the belt ply Belt bandage 50 Production line 51 Roller (for cord web 14) 52 Roller (for cord web 15) 53 Intermediate layer (for winding cord web 15) 54 Idler roller (for roller 51) 55 Punching station 56 Splicing station 57 Conveyor belt 58 Cassette 59 Intermediate layer (for winding the endless belt from sections 1, 2) 60 Idler roller (for cassette 58) 61 Straight-edged endless beltReferences included in the specificationThis list of documents cited by the applicant has been produced in an automated manner and is only included for the better information of the reader. The list is not part of the German patent application or utility model application. The DPMA does not take any adhesion for any faults or omissions.Patent Literature citedUS 2011 / 0174420 A1

[0003]

Claims

Belt ply (10, 10a, 10b) for a vehicle tyre (30), wherein the belt ply (10, 10a, 10b) comprises reinforcing members (13, 13a, 13b) embedded in a rubber mixture (11, 12), wherein the rubber mixture (11) is electrically non-conductive in a first section (1, 1a, 1b) of the belt ply (10, 10a, 10b), characterized in that the rubber mixture (12) is electrically conductive in a second section (2, 2a, 2b) of the belt ply (10, 10a, 10b).Belt ply (10, 10a, 10b) according to Claim 1, characterized in that the rubber mixture (11) in the first section (1) has a better suitability for minimizing a rolling resistance of the vehicle tyre (30) than the rubber mixture (12) in the second section (2).Belt ply (10, 10a, 10b) according to either of Claims 1 and 2, characterized in that a boundary between the first portion (1, 1a, 1b) and the second portion (2, 2a, 2b) runs parallel to a course of the reinforcing members (13, 13a, 13b) in the first portion (1, 1a, 1b) and the second portion (2, 2a, 2b).Belt ply (10, 10a, 10b) according to one of Claims 1 to 3, characterized in that the first section (1, 1a, 1b) adjoins a second section (2, 2a, 2b) on both sides in the circumferential direction, the second section (2, 2a, 2b) adjoining a first section (1, 1a, 1b) on both sides in the circumferential direction.The belt ply (10, 10a, 10b) according to any one of claims 1 to 4, characterized in that the belt ply (10, 10a, 10b) comprises a number n of first portions (1, 1a, 1b) and a number m of second portions (2, 2a, 2b).Belt ply (10, 10a, 10b) according to Claim 5, characterized in that the number n corresponds to a natural number between 1 and 30, preferably between 3 and 15, the number m corresponding to a natural number between 1 and 30, preferably between 3 and 15.Belt dressing (20) having two belt plies (10a, 10b) according to one of Claims 1 to 6, characterized in that the belt plies (10a, 10b) are arranged one above the other in the radial direction, wherein the second section (2a) of the first belt ply (10a) is in direct electrical contact with the second section (2b) of the second belt ply (10b).Belt dressing (20) according to Claim 7, characterized in that the reinforcing elements (13a) in the first belt ply (10a) run at an opposite gradient to the reinforcing elements (13b) in the second belt ply (10b).Belt dressing (20) according to either of Claims 7 and 8, characterized in that second portions (2a) of the first belt ply (10a) and second portions (2b) of the second belt ply (10b) are in direct electrical contact at a number k of mutually separated contact regions (21), k corresponding to a natural number between 1 and 100, preferably between 2 and 10.The belt dressing (20) according to claim 9, characterized in that at least one of the contact areas (21) is arranged completely within an axial distance of at most 30% of an axial width of the belt dressing (20) from an axial center of the belt dressing (20).Vehicle tyre (30) having a belt ply (10, 10a, 10b) and / or a belt structure (20) according to one of Claims 1 to 10.Vehicle tyre (30) according to Claim 11, characterized in that the vehicle tyre comprises a belt bandage (40), the belt bandage (40) being arranged radially above the belt ply (10, 10a, 10b) or the belt bandage (20), the belt bandage (40) comprising a first portion (41) and a second portion (42), the first portion (41) being designed to be electrically non-conductive and the second portion (42) being designed to be electrically conductive, the second portion (42) of the belt bandage being in electrical contact with the second portion (2, 2a, 2b) of the belt ply (10, 10a, 10b) or with the second portion of one of the belt plies (10, 10a, 10b) in the belt bandage (20).The method for manufacturing a belt ply (10, 10a, 10b) according to any one of claims 1 to 6, characterized in that a first portion (1, 1a, 1b) and a second portion (2, 2a, 2b) are provided and joined to each other.Method according to claim 13, wherein the first section (1, 1a, 1b) is provided by separating the first section from a first cord web (14) at an angle between 5° and 85° to a course of the strengthening members (13, 13a, 13b) in the first section (1, 1a, 1b), wherein the second section (2, 2a, 2b) is provided by separating the second section (2, 2a, 2b) from a second cord web (15) at an angle between 5° and 85° to a course of the strengthening members (13, 13a, 13b) in the second section (1, 1a, 1b).Method according to one of claims 13 or 14, wherein the first section (1, 1a, 1b) and the second section (2, 2a, 2b) are connected to one another by a splicing method.

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