Method for producing a vehicle tire, vulcanization mold and vehicle tire

Abstract

The invention relates to a method for producing a vehicle tire comprising at least the following steps: - Providing a green tire (2) and placing it in a vulcanization mold (5); - Vulcanizing the green tire (2) by heating a shaping element (9) so that a profiling (11) is formed on an outer side (4) of the green tire (2), and applying a heating medium to a heating bladder (6) so that the heating bladder (6) forms a marking (13) on an inner side (3) of the green tire with a negative marking structure (8). According to the invention, it is provided that the shaping element (9) has a shape reference point (14) and the heating bladder (6) has a bladder reference point (15), wherein the shaping element (9) is or is positioned relative to the heating bladder (6) during the vulcanization of the green tire (2) in such a way that the shape reference point (14) assumes a predetermined relative position (P) to the bladder reference point (15), so that the marking (13) on the inside (3) of the green tire has a predetermined relative position (L) to the profiling (11) on the outside (4) of the green tire.

Description

The invention relates to a method for producing a vehicle tire, to a vulcanization mold for carrying out the method, and to a vehicle tire, in particular produced in the vulcanization mold.Tire sensors are conventionally attached to a tire inner side (inner liner) of a vehicle tire. For this purpose, rubber containers, for example, are fastened to the tire inner side, into which the tire sensors are then inserted. For some applications, there are recommendations at which location the rubber containers are attached, these recommendations typically referring to non-specifically extended markings on a sidewall of the vehicle tire. Accurate positioning of the tire sensors is therefore not guaranteed. For certain application cases, e.g. a profile depth estimate via these tire sensors or a load determination with such tire sensors, an exact positioning of the tire sensors with respect to the profile (profile pattern) of the vehicle tire is very advantageous, since the position of the tire sensors with respect to the profile has an influence on the measurements.According to US20210291470A1, it is provided that marking is made on a tire inner side by means of engraving on a heating bladder during the vulcanization in order to define a sensor position.According to DE102021210003A1, it is provided that an electronic identification unit is introduced at a provisionally marked location in a side surface of a tire.According to US1040668B2, it is provided that during vulcanization a sensor patch is attached to the tire inner side, followed by the attachment of a sensor module.According to DE102022200103A1, it is provided that an RFID transponder is attached to the tire during the vulcanization.According to US20220009295A1, it is provided that during vulcanization a sensor container is attached to the tire inner side, followed by the attachment of a tire sensor.According to EP2072291B1, it is provided that during vulcanization a sensor mount is attached to the tire inner side, followed by the attachment of a tire sensor.The object of the present invention is to provide a method for producing a vehicle tire, by means of which it is made possible in a simple manner to position tire sensors exactly. It is a further object of the invention to provide a vulcanization mold and a vehicle tire.This object is achieved by a method for producing a vehicle tire, a vulcanization mold for carrying out the method, and a vehicle tire, in particular produced in the vulcanization mold, according to the independent claims. The dependent claims indicate preferred refinements.Accordingly, a method for producing a vehicle tire in a vulcanization mold having at least one heating bellows, wherein the heating bellows has a negative marking structure on a surface, and at least one heatable shaping element, wherein the at least one heatable shaping element has a negative profile structure, is provided, wherein the method has at least the following steps:providing a tire blank having a blank inner side and a blank outer side, wherein at least a part of the blank outer side of the tire blank forms the later tread surface of the vehicle tire;introducing the tire blank into the vulcanization mold in such a way that the blank outer side abuts the at least one shaping element; andcuring the introduced tire blank to form the vehicle tire byheating the at least one shaping element, so that the profile negative structure forms a profile on the blank outer side of the tire blank by pressing the profile negative structure against the heated blank outer side of the tire blank, andapplying a heating medium to a bladder interior of the at least one heating bladder, such that the heating bladder is pressed with its surface against the blank inner side and a marking is formed on the blank inner side of the tire blank by the marking negative structure by the marking negative structure on the surface of the heating bladder being pressed against the heated blank inner side of the tire blank; wherein the at least one shaping element has a shape reference point and the at least one heating bladder has a bladder reference point, wherein the at least one shaping element is or is positioned relative to the at least one heating bladder during the vulcanization of the introduced tire blank in such a way that the shape reference point assumes a predefined relative position, for example a predefined angular position, with respect to the bladder reference point, such that the marking on the blank inner side of the tire blank has a predefined relative position with respect to the profiling on the blank outer side of the tire blank; andremoving the vehicle tire from the vulcanization mold, optionally with further steps.This already results in the following advantages:By a corresponding selection of the predefined relative position between the mold reference point and the bladder reference point, the marking on the blank inner side of the tire blank or on the tire inner side of the finished vehicle tire after vulcanization has a predefined relative position with respect to the profiling on the blank outer side or the tire outer side. As a result, a position for the tire sensor can be defined in a simple manner already during the vulcanization, so that the tire sensor is in an exact relative position to the profiling during the subsequent attachment to the marking. Thus, for example, it is relevant for profile depth estimation that the tire sensor is arranged exactly below individual profile blocks of the profile in the radial direction. Furthermore, in the case of a load determination by means of one or more tire sensors, it may be advantageous for the tire sensors to be arranged exactly below individual profile grooves of the profile in the radial direction.The marking or marking negative structure can have a plurality of possible shapes and signs which are suitable for exactly indicating a position for the tire sensor, for example a cross, a corner or a (half) circle or the like. The tire sensor to be positioned can then preferably be arranged in the center of the marking or at a predetermined position relative to the marking, for example, resting on the corner or the semicircle. The marking negative structure can thus be flexibly adapted to the respective application.The shape reference point may be any recognizable point on the forming element. The bladder reference point may be any recognizable point on the bladder. On the basis of the mold reference point and the bladder reference point, the relative position of the molding element and heating bladder before vulcanization can be adjusted accordingly. The relative position can be predefined by an angular position or a relative angle between the bellows reference point and the mold reference point with respect to the center point of the vulcanization mold. The bellows reference point can also correspond, for example, to a part of the marking negative structure, for example an edge or the center, and the shape reference point can correspond, for example, to a specific feature of the profile negative structure, so that no additional structures are to be applied, on the basis of which the relative position is set.The object according to the invention is likewise achieved by a vulcanization mold for producing a vehicle tire, in particular according to the method according to the invention, wherein the vulcanization mold has at least:at least one heating bellows having a bellows interior and a surface, wherein the bellows interior can be acted upon with a heating medium in order to press the surface of the heating bellows against a blank inner side of a tyre blank introduced into the vulcanization mould, andat least one heatable shaping element for placing on an outer side of the introduced tire blank, wherein the heating bladder has a negative marking structure on the surface for forming a marking on the blank inner side of the introduced tire blank, and wherein the at least one heatable shaping element has a negative profile structure for forming a profiling on the blank outer side of the introduced tire blank, wherein the at least one shaping element has a shape reference point and the at least one heating bladder has a bladder reference point, wherein the at least one shaping element can be positioned relative to the heating bladder in such a way that the shape reference point assumes a predefined relative position to the bladder reference point.The object according to the invention is furthermore achieved by a vehicle tire, in particular produced by the method according to the invention, preferably in the vulcanization mold according to the invention, wherein the vehicle tire has at least:a profile on a tire outer side of the vehicle tire,a marking on a tire inner side of the vehicle tire,a tire sensor disposed on the mark or adjacent to the mark on the tire inner side, wherein the tire sensor and / or the marking on the tire inner side of the vehicle tire has a predefined position relative to the profiling on the tire outer side of the vehicle tire.The advantages of the vulcanization mold according to the invention and of the vehicle tire according to the invention result analogously to those of the method according to the invention.According to one embodiment of the method, the relative position between the shape reference point and the bladder reference point is predefined in such a way that the marking on the blank inner side of the tire blank lies opposite a single profile block or a single profile groove of the profile on the blank outer side of the tire blank in the radial direction, wherein the single profile groove of the profile preferably runs in the circumferential direction or substantially in the axial direction of the vehicle tire.A positioning of the tire sensor corresponding to this marking has the above-mentioned advantages, for example for profile depth estimation or load determination, wherein depending on the arrangement under a profile groove running in the circumferential direction or in the axial direction, corresponding directed forces, expansions or deformations can be processed with the corresponding location-related accelerations via the tire sensor.According to a further embodiment of the method, the relative position between the shape reference point and the bladder reference point is predefined in such a way that the marking is arranged centrally in the axial direction on the inner side of the tire blank.A positioning of the tire sensor corresponding to this marking has the advantage that, for example, in the case of profile depth estimation, a value for a central region of the vehicle tire or of the tread can be estimated. Such a value may indicate a more reliable value for tread depth estimation than a value for tread depth determined in a rim or shoulder region of the vehicle tire. Also in load determination, central measurement can provide more reliable results.According to a further embodiment of the method, a groove structure for removing air inclusions during vulcanization is arranged on the surface of the heating bellows, wherein the groove structure extends over the marking negative structure. This results in the advantageous removal of air inclusions during vulcanization also in the area of the negative marking structure, which is advantageous in particular in the case of flat negative marking structures.According to a further embodiment of the method, the marking negative structure is formed by a depression in the surface of the heating bellows. This has the result that the marking resulting on the blank inner side or the tire inner side represents an elevation. By a corresponding local elevation on the blank inner side or the tire inner side, the tire structure is not locally weakened. In principle, however, depending on the structure and construction of the vehicle tire, a depression as a marking or an elevation as a negative marking structure would be possible.According to a further embodiment of the method, the relative position between the shape reference point and the bellows reference point is predefined for the production of a plurality of vehicle tires, preferably all vehicle tires of one type. This allows a comparison of sensor data that were collected by tire sensors that are positioned exactly by means of the markings. The comparison is possible in particular since effects caused by a different positioning are avoided. Thus, all manufactured vehicle tires of one type or construction type have this marking and thus also the tire sensors at identical locations relative to the profiling.According to a further embodiment of the method, a plurality or at least two negative marking structures are arranged on the surface of the heating bladder, in order to form a plurality or more than two markings on the inner side of the tire blank. This makes it possible to position a plurality of tire sensors exactly relative to the profiling. For example, it may be expedient for two tire sensors to be arranged exactly opposite one another, i.e. offset by 180° with respect to one another, on the tire inner side in order to carry out a corresponding measurement and evaluation.According to a further embodiment of the method, in a positioning step a rubber container for receiving a tire sensor or the tire sensor is attached directly on or adjacent to the marking on the blank inner side of the tire blank or on a tire inner side of the manufactured vehicle tire, wherein the positioning step takes place during or after the vulcanization.A rubber container is a structure, preferably made of the tire material itself to be vulcanized, which is attached to the blank inner side during vulcanization and therefore is to be positioned accordingly. The rubber container is preferably configured to receive the tire sensor in a cavity and to hold it during operation of the vehicle tire.A corresponding positioning of rubber container and / or tire sensor enables the above-mentioned advantages.In the drawings, there are shown: FIG. 1 is a sectional view of a vehicle tire in a vulcanization mold, FIG. 2 is an exploded view of a portion of the vehicle tire of FIG. 1 in the vulcanization mold, FIG. 3 shows a sectional view of the vehicle tire from FIGS. 1 and 2, FIG. 4 is a top view of the profiling of the vehicle tire from FIGS. 1 to 3.FIG. 1 schematically shows a sectional view of a vulcanization mold 5 for producing a vehicle tire 1. a green tire 2 is depicted with a green inner side 3 and a green outer side 4, wherein the green tire 2 is located in the vulcanization mold 5. The vulcanization process cures the tire blank 2 and brings it into its final shape, which then, according to FIG. 3, forms the vehicle tire 1 with a tire inner side 3 a(inner liner) and a tire outer side 4 a(tread), which can then be further processed in further steps.The vulcanization mold 5 has a heating bellows 6, wherein the heating bellows 6 has a negative marking structure 8 in the form of a depression 19 on the surface 7 facing the blank inner side 3. Furthermore, the vulcanization mold 5 has a heatable shaping element 9, wherein the shaping element 9 has a profile negative structure 10 on the side facing the blank outer side 4.During vulcanization, the introduced tire blank 2 is heated from the outside by heating the shaping element 9. In addition, a heating medium is applied to a bladder interior 12 of the heating bladder 6, so that the heating bladder 6 is pressed with its surface 7 against the inner side 3 of the blank and the tire blank 2 is thereby also heated from the inside.During the vulcanization, the profile negative structure 10 on the shaping element 9 forms a profile 11 in the blank outer side 4, which profile is accordingly also present on the tire outer side 4 aof the finished vehicle tire 1. The profiling 11 has, as usual, profile blocks 16 and profile grooves 17 (longitudinal grooves and transverse grooves) delimiting the profile blocks 16. Furthermore, a marking 13 is formed in the blank inner side 3 by the marking negative structure 8 on the heating bellows 6 during the vulcanization, which marking is accordingly also present on the tire inner side 3 aof the finished vehicle tire 1, for example in the form of a cross in FIG. 3. The marking 13 is provided for positioning a tire sensor 21 precisely at or relative to the location on the finished vehicle tire 1 predefined by the marking 13. The position of the marking 13 thus also characterizes the position of the tire sensor 21 to be attached.In FIG. 1, the marking negative structure 8 on the heating bellows 6 is embodied in the form of a depression 19, which leads to a resultant marking 13 on the blank inner side 3 or tire inner side 3 ain the form of an elevation 22 with respect to the blank inner side 3 or tire inner side 3 a. By a corresponding elevation 22 as marking 13, the tire structure is not locally weakened, in contrast to a local depression.During vulcanization, the shaping element 9 and the heating bellows 6 of the vulcanization mold 5 are positioned relative to one another in such a way that, as shown in FIG. 2, a mold reference point 14 on the shaping element 9 has a predefined relative position P, for example a predefined angular position, with respect to a bellows reference point 15 on the heating bellows 6. The heating bellows 6 is thus aligned relative to the shaping element 9 in a targeted manner before vulcanization in the vulcanization mold 5. As a result, the marking 13 on the blank inner side 3 of the tire blank 2 or the tire inner side 3 aof the finished vehicle tire 1 has a predefined relative position L with respect to the formed profiling 11 on the blank outer side 4 of the tire blank 2 or the tire outer side 4 aof the finished vehicle tire 1. The relative position L between the marking 13 and the profiling 11 is thus determined by the relative position P between the bellows reference point 15 and the shape reference point 14.FIG. 2 shows an exploded view of a part of the vulcanization mold 5 with the tire blank 2 in a perspective tilted by 90° with respect to FIG. 1. Here too, the vulcanization mold 5 is shown with all the components already mentioned. Furthermore, the shape reference point 14 on the shaping element 9 is shown in a predetermined relative position P or angular position with respect to the bellows reference point 15 on the heating bellows 6.From the predefined relative position P or angular position between the shape reference point 14 and the bellows reference point 15, a predefined relative position L of the marking 13 on the blank inner side 3 of the tire blank 2 or the tire inner side 3 aof the finished vehicle tire 1 directly results for profiling 11 on the blank outer side 4 of the tire blank 2 or the tire outer side 4 aof the finished vehicle tire 1.An advantageous positioning of tire sensor 21 relative to profiling 11 is illustrated by way of example in FIGS. 3 and 4.The tire sensor 21 attached to the marking 13 is accordingly arranged in a rubber container 20, wherein the rubber container 20 is accordingly attached to or adjacent to the marking 13 in order to enable a predetermined positioning, in particular relative to the profiling 11.The tire sensor 21 is arranged on the inside relative to the outer-side profile 11 in such a way that the tire sensor 21 is situated opposite a profile block 16 running in the circumferential direction U of the vehicle tire 1 in the radial direction R of the vehicle tire 1 or is arranged underneath it. This is made clear in particular with reference to FIG. 4, which shows a plan view of the profiling 11 of the vehicle tire 1 from FIGS. 1 to 3. In this case, the vehicle tire 1 is kept transparent, so that only the profiling 11 and the tire sensor 21 lying beneath it in the radial direction R can be seen.By means of the arrangement of tire sensor 21 and profile block 16 shown in FIGS. 3 and 4, which can be achieved by the exact relative positioning between the shape reference point 14 on the shaping element 9 and the bellows reference point 15 on the heating bellows 6, it is possible in a particularly advantageous manner to perform profile depth estimation. The tire sensor 21 is arranged centrally on the tire inner side 3 opposite a profile block 16 in the axial direction Q. This results in profile depth estimation at just this point. Alternatively, a corresponding positioning radially below a profile groove 17 can also be provided, in order to be able to carry out a load measurement more reliably, for example.List of reference characters1 Vehicle tire 2 Tire blank 3 Blank inner side 3 a Tire inner side 4 Blank outer side 4 a Reifen outer side 5 Vulcanization mold 6 Heating bladder 7 Surface of the heating bladder 6 8 Marking negative structure 9 Shaping element 10 Profile negative structure 11 Profiling 12 Bladder interior 13 Marking 14 Shape reference point 15 Bladder reference point 16 Profile block 17 Profile groove 19 Depression in the surface 7 of the heating bladder 6 20 Rubber container 21 Tire sensor 22 Elevation on the blank inner side 3 or tire inner side 3 aL relative position P relative position R radial direction U circumferential direction Q axial directionReferences 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 20210291470A1

[0003] DE 102021210003A1

[0004] US 10406868B2

[0005] DE 102022200103A1

[0006] US 20220009295A1

[0007] EP 2072291B1

[0008]

Claims

Method for producing a vehicle tyre (1) in a vulcanization mould (5) having at least one heating bladder (6), wherein the heating bladder (6) has a marking negative structure (8) on a surface (7), and at least one heatable shaping element (9), wherein the at least one heatable shaping element (9) has a profile negative structure (10), wherein the method has at least the following steps: - providing a tyre blank (2) having a blank inner side (3) and a blank outer side (4); - introducing the tyre blank (2) into the vulcanization mould (5) in such a way that the blank outer side (4) bears against the at least one shaping element (9); and vulcanization of the introduced tire blank (2) for forming the vehicle tire (1) by heating the at least one shaping element (9), so that a profile (11) is formed on the blank outer side (4) of the tire blank (2) by the profile negative structure (10), and applying a heating medium to a bladder interior (12) of the at least one heating bladder (6), so that the heating bladder (6) is pressed with its surface (7) against the blank inner side (3) and a mark (13) is formed on the blank inner side (3) of the tire blank (2) by the mark negative structure (8); - Removal of the vehicle tyre (1) from the vulcanization mould (5), characterized in that the at least one moulding element (9) has a mould reference point (14) and the at least one heating bellows (6) has a bellows reference point (15), wherein the at least one moulding element (9) is or is positioned relative to the at least one heating bellows (6) during the vulcanization of the introduced tyre blank (2) in such a way that the mould reference point (14) assumes a predefined relative position (P) to the bellows reference point (15), such that the marking (13) on the blank inner side (3) of the tyre blank (2) has a predefined relative position (L) to the profiling (11) on the blank outer side (4) of the tyre blank (2).Method according to Claim 1, characterized in that the relative position (P) between the shape reference point (14) and the bellows reference point (15) is predefined in such a way that the marking (13) on the blank inner side (3) of the tyre blank (2) is opposite an individual profile block (16) or an individual profile groove (17) of the profile (11) on the blank outer side (4) of the tyre blank (2) in the radial direction (R), wherein the individual profile groove (17) of the profile (11) preferably runs in the circumferential direction (U) or substantially in the axial direction (Q) of the vehicle tyre (1).Method according to one of the preceding claims, characterized in that the relative position (P) between the shape reference point (14) and the bellows reference point (15) is predefined in such a way that the marking (13) is arranged centrally on the inner side (3) of the tire blank (2) of the blank in the axial direction (Q).Method according to one of the preceding claims, characterized in that a groove structure for removing air inclusions during vulcanization is arranged on the surface (7) of the heating bellows (6), wherein the groove structure extends over the marking negative structure (8).Method according to one of the preceding claims, characterized in that the marking negative structure (8) is formed by a depression (19) in the surface (7) of the heating bellows (6) for forming an elevation (22) as a marking (13).Method according to one of the preceding claims, characterized in that the marking negative structure (8) and / or the marking (13) is formed by a cross, a corner or a semicircle or a circle.Method according to one of the preceding claims, characterized in that the relative position (P) between the shape reference point (14) and the bellows reference point (15) is predefined for the production of a plurality of vehicle tyres (1), preferably of all vehicle tyres (1) of one type of construction.Method according to one of the preceding claims, characterized in that at least two negative marking structures (8) are arranged on the surface (7) of the heating bellows (6) in order to form a plurality of markings (13) on the inner side (3) of the tyre blank (2).Method according to one of the preceding claims, characterized in that, in a positioning step, a rubber container (20) for receiving a tyre sensor (21) or the tyre sensor (21) is attached directly on or adjacent to the marking (13) on the blank inner side (3) of the tyre blank (2) or on a tyre inner side (3a) of the produced vehicle tyre (1), wherein the positioning step takes place during or after the vulcanization.Method according to one of the preceding claims, characterized in that the bellows reference point (15) is formed at least partially by the marking negative structure (8) and / or the shape reference point (14) is formed at least partially by the profile negative structure (10).Vulcanization mould (5) for producing a vehicle tyre (1), in particular according to a method according to one of the preceding claims, at least comprising: - at least one heating bellows (6) having a bellows interior (12) and a surface (7), wherein the bellows interior (12) can be acted upon by a heating medium in order to press the surface (7) of the heating bellows (6) against a blank inner side (3) of a tyre blank (2) introduced into the vulcanization mould (5), and - at least one heatable shaping element (9) for placing against a blank outer side (4) of the introduced tyre blank (2), wherein the heating bellows (6) has a marking negative structure (8) on the surface (7) for forming a marking (13) on the blank inner side (3) of the introduced tyre blank (2), and wherein the at least one heatable shaping element (9) has a profile negative structure (10) for forming a profile (11) on the blank outer side (6) of the introduced tire blank (2), characterized in that the at least one shaping element (9) has a shape reference point (14) and the at least one heating bellows (6) has a bellows reference point (15), wherein the at least one shaping element (9) can be positioned relative to the heating bellows (6) in such a way that the shape reference point (14) assumes a predefined relative position (P) to the bellows reference point (15).Vehicle tyre (1), in particular produced according to a method according to Claims 1 to 10, in particular in a vulcanization mould (5) according to Claim 11, wherein the vehicle tyre (1) has: - a profile (11) on a tyre outer side (4a) of the vehicle tyre (1), - a marking (13) on a tyre inner side (3a) of the vehicle tyre (1), - a tyre sensor (21) which is arranged on the marking (13) or adjacent to the marking (13) on the tyre inner side (3a), characterized in that the tyre sensor (21) and / or the marking (13) on the tyre inner side (3a) of the vehicle tyre (1) has a predefined relative position (L) to the profile (11) on the tyre outer side (4a) of the vehicle tyre (1).Vehicle tyre (1) according to Claim 12, characterized in that the relative position (L) is predefined in such a way that the tyre sensor (21) and / or the marking (13) is positioned in the radial direction (R) below an individual profile block (16) of the profile (11) or in the radial direction (R) below a profile groove (17) of the profile (11) delimiting the profile blocks (16).

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