Radial-type air tire with rim rubber, use of a rim rubber and a vehicle wheel system comprising the radial-type air tire

Description

[0001] The invention relates to a pneumatic vehicle tire of radial design with a rim rubber comprising two bead regions with bead cores, a carcass insert extending around the bead cores and having carcass folds extending toward the sidewalls. The invention also relates to a use of a rim rubber and a vehicle wheel system comprising the pneumatic vehicle tire of radial design.

[0002] Such a pneumatic vehicle tire is known from EP 2 500 188 A1. Generally, a rim rubber extends as a narrow cross-sectional strip along the carcass turnup into the area radially below the bead core. The rim rubber can consist of one and optionally additional rim rubber parts. In the case where the rim rubber consists of two rim rubber parts, the first rim rubber part can, for example, as shown in EP 2 500 188 A1, at least partially cover the second rim rubber part on the outside, with the first rim rubber part being overlapped by the sidewall in the direction of the tread.

[0003] EP 1992506A2 discloses a heavy-duty tire having a wind bead structure in which a turned-up portion of a carcass ply is wound around a bead core, a bead portion being provided with a bead reinforcing layer having a U-shaped cross-section and a bead crown rubber having a triangular cross-section.

[0004] Furthermore, JP 2016124429A discloses a rim cushion rubber arranged at a point contacting the rim of a bead portion.

[0005] DE 102013107385A1 describes a pneumatic vehicle tire of radial design with at least one component made of at least one electrically non-conductive rubber compound, with bead regions with bead cores, a carcass insert running around the bead cores with raised folds that extend towards the sidewalls, with a rim rubber which forms the outer surface of the bead region, runs along the carcass raised fold and consists of a rim rubber part made of an electrically non-conductive rubber compound and a rim rubber part made of an electrically conductive rubber compound, which connects at least one electrically conductive component running in the tire, which forms or co-forms an electrically conductive connection to the outside of the tire, to the rim.

[0006] Furthermore, EP 2738022A1 describes a tire comprising penetrating portions, an undertread, a belt, a carcass and rivets.

[0007] An object underlying the invention is to provide a pneumatic vehicle tire of radial design which resolves the conflict of objectives between lateral stiffness and rolling resistance and, in particular, has improved rolling resistance without significantly impairing the lateral stiffness.

[0008] This object is achieved according to the invention by a pneumatic vehicle tire of radial design, comprising two bead areas with bead cores, a carcass insert running around the bead cores with carcass turn-ups extending towards the sidewalls, at least one rim rubber which forms the outer surface of a bead area and consists of a first rim rubber part consisting of a first rubber mixture and a second rim rubber part consisting of a second rubber mixture, wherein the first rim rubber part runs along the carcass turn-up and the second rim rubber part is designed such that, after being mounted on a rim, it is arranged at least partially between the bead cores and the rim, characterized in that the first rubber compound has a rebound resilience at 20 °C according to DIN 53512 in the range of 20 % and 80 % and the rebound resilience of the second rubber compound, also measured at 20 °C according to DIN 53512, differs from the rebound resilience of the first rubber compound.

[0009] In EP 2500188 A1, rolling resistance is improved by reducing the size of rubber parts (see

[0023] in EP 2500188 A1). However, this has the disadvantage that it inevitably leads to a deterioration in lateral stiffness due to the missing rubber part. Thus, according to document EP 2500188 A1, there is a trade-off between rolling resistance and lateral stiffness in the production of rim rubber for a pneumatic vehicle tire.

[0010] Surprisingly, it was found within the scope of the present invention that by precisely adjusting the rebound elasticity of the two rim rubber parts of a pneumatic vehicle tire according to the invention the rolling resistance can be improved without reducing the lateral stiffness of the pneumatic vehicle tire, or the lateral stiffness can be improved without reducing the rolling resistance of the pneumatic vehicle tire.

[0011] By adjusting the rebound resilience of the two rim rubber parts of a rim rubber of a pneumatic vehicle tire according to the invention, the conflict of objectives described above could be resolved. This represents a surprising technical effect.

[0012] In the context of the present invention, the term "rubber mixture" includes vulcanized and unvulcanized rubber mixtures, in particular vulcanized rubber mixtures.

[0013] A device according to the invention is preferred as described above or as described above as preferred, wherein exclusively the second rim rubber part of each rim rubber forms the outer surface of the respective bead region in which the respective rim rubber is arranged.

[0014] An advantage of the above-described aspect of the present invention is that the lateral stiffness can be improved compared to pneumatic vehicle tires in which the second rim rubber part does not form the entire outer surface of the bead region.

[0015] A device according to the invention is preferred as described above or as described above as preferred, wherein the pneumatic vehicle tire has a rim rubber in each of the two bead regions of the pneumatic vehicle tire, wherein each of the two rim rubbers forms the outer surface of the bead region and consists of a first rim rubber part consisting of a first rubber mixture and a second rim rubber part consisting of a second rubber mixture, wherein the first rubber compound of one rim rubber is the same rubber compound as the first rubber compound of the other rim rubber, the second rubber compound of one rim rubber is the same rubber compound as the second rubber compound of the other rim rubber, the first rim rubber part of each rim rubber runs along the respective carcass turn-up, and the second rim rubber part of each rim rubber is designed such that the second rim rubber part is arranged at least partially between the respective bead core and the rim after being mounted on a rim, wherein preferably only the second rim rubber part of the respective rim rubber forms the outer surface of the bead region in which the respective rim rubber is arranged.

[0016] A device according to the invention is preferred as described above or as described above as preferred, wherein the ratio between the rebound resilience of the first rubber mixture and the rebound resilience of the second rubber mixture is in the range from 1:2 to 2:1, preferably in the range from 1.01:1 to 2:1, particularly preferably in the range from 1.1:1 to 1.5:1.

[0017] An advantage of the above-described aspect of the present invention is that the rolling resistance improves progressively according to the order of the above-described ranges.

[0018] A device according to the invention is preferred as described above or as described above as preferred, wherein the first rubber mixture of the first rim rubber part comprises a natural rubber and / or a butadiene rubber or consists of natural rubber and butadiene rubber.

[0019] An advantage of the above-described aspect of the present invention is that the rolling resistance is improved, particularly in the case of such rim rubbers, compared to rim rubbers which comprise other types of rubber.

[0020] A device according to the invention is preferred as described above or as described above as preferred, wherein the first and / or second rubber mixture comprises a natural rubber in amounts of 10 to 50 phr and / or a butadiene rubber in amounts of 50 to 90 phr, preferably a natural rubber in amounts of 15 to 35 phr and / or a butadiene rubber in amounts of 65 to 85 phr.

[0021] An advantage of the above-described aspect of the present invention is that the rolling resistance improves progressively according to the order of the above-described ranges.

[0022] A device according to the invention as described above or as described above as preferred is preferred, wherein the first and / or second rubber mixture comprises a filler, preferably carbon black, wherein the filler is particularly preferably present in an amount of 20 to 180 phr, very particularly preferably in an amount of 40 to 110 phr, in particular very particularly preferably in an amount of 60 to 80 phr.

[0023] An advantage of the above-described aspect of the present invention is that the lateral stiffness continues to improve according to the order of the regions described above.

[0024] A device according to the invention is preferred as described above or as described above as preferred, wherein the first and / or second rubber mixture comprises zinc oxide and stearic acid, wherein the total amount of zinc oxide and stearic acid is preferably in the range from 1 to 30 phr, particularly preferably in an amount of 1 to 20 phr, most preferably in an amount of 5 to 9 phr.

[0025] An advantage of the above-described aspect of the present invention is that the lateral stiffness continues to improve according to the order of the regions described above.

[0026] A device according to the invention is preferred as described above or as described above as preferred, wherein the first and / or second rubber mixture comprises zinc oxide and stearic acid, wherein the total amount of zinc oxide and stearic acid in the second rubber mixture is in the range of 5 to 9 phr and the total amount of zinc oxide and stearic acid in the first rubber mixture is in the range of 10 to 15 phr.

[0027] An advantage of the above-described aspect of the present invention is that the rolling resistance of pneumatic vehicle tires according to the invention with the rim rubber parts described above is further improved compared to other pneumatic vehicle tires according to the invention, while the lateral stiffness is not impaired.

[0028] A device according to the invention as described above or as described above as preferred is preferred, wherein the first and / or second rubber mixture comprises sulfur, wherein the total amount of sulfur is preferably in the range of 1 to 10 phr, particularly preferably in an amount of 1 to 5 phr.

[0029] An advantage of the above-described aspect of the present invention is that the lateral stiffness continues to improve according to the order of the regions described above.

[0030] A device according to the invention is preferred as described above or as described above as preferred, wherein the first and / or second rubber mixture comprises sulfur, wherein the total amount of sulfur in the second rubber mixture of the second rim rubber part is in the range of 1 to 2.5 phr and the total amount of sulfur in the first rubber mixture of the first rim rubber part is in the range of 3 to 5 phr.

[0031] An advantage of the above-described aspect of the present invention is that the rolling resistance of pneumatic vehicle tires according to the invention with the rim rubber parts described above is further improved compared to other pneumatic vehicle tires according to the invention, while the lateral stiffness is not impaired.

[0032] A device according to the invention is preferred as described above or as described above as preferred, wherein the first and / or second rubber mixture comprises further vulcanizing agents other than sulfur, wherein the total amount of the further vulcanizing agents is preferably in the range from 1 to 10 phr, particularly preferably in an amount of 3 to 6 phr.

[0033] An advantage of the above-described aspect of the present invention is that the lateral stiffness continues to improve according to the order of the regions described above.

[0034] A device according to the invention is preferred as described above or as described above as preferred, wherein the first rubber mixture of the first rim rubber part comprises a resin, wherein the resin is preferably present in an amount of 1 to 30 phr, particularly preferably in an amount of 5 to 15 phr, most preferably in an amount of 1 to 9 phr,

[0035] An advantage of the above-described aspect of the present invention is that the lateral stiffness continues to improve according to the order of the regions described above.

[0036] A device according to the invention is preferred as described above or as described above as preferred, wherein the first and / or second rubber mixture comprises a resin, wherein the resin is preferably present in an amount of 0 to 4 phr and particularly preferably no resin at all is present in the second rubber mixture.

[0037] An advantage of the above-described aspect of the present invention is that the rolling resistance of pneumatic vehicle tires according to the invention with the rim rubber parts described above is further improved compared to other pneumatic vehicle tires according to the invention, while the lateral stiffness is not impaired.

[0038] A device according to the invention is preferred as described above or as described above as preferred, wherein the first rubber mixture has a Shore hardness in the range from 60 Sh-A to 130 Sh-A, preferably a Shore hardness in the range from 60 Sh-A to 80 Sh-A, measured at 20 °C by means of a durometer according to DIN ISO 7619-1, wherein the ratio between the Shore hardness of the first rubber mixture and the Shore hardness of the second rubber mixture is preferably in the range from 1:2 to 4:1, particularly preferably in the range from 1:1.5 to 2:1, very particularly preferably in the range from 1:1.1 to 1.5:1, in particular very particularly preferably in the range from 1:1.1 to 1.1:1.

[0039] An advantage of the above-described aspect of the present invention is that the lateral stiffness continues to improve according to the order of the regions described above.

[0040] A device according to the invention is preferred as described above or as described above as preferred, wherein the second rubber mixture has a Shore hardness of greater than 30 Sh-A, preferably a Shore hardness in the range from 40 Sh-A to 89 Sh-A, particularly preferably a Shore hardness in the range from 65 Sh-A to 80 Sh-A, in each case measured at 20 °C by means of a durometer according to DIN ISO 7619-1, wherein the ratio between the Shore hardness of the first rubber mixture and the Shore hardness of the second rubber mixture is preferably in the range from 1:2 to 4:1, particularly preferably in the range from 1:1.5 to 2:1, very particularly preferably in the range from 1:1.1 to 1.5:1, in particular very particularly preferably in the range from 1:1.1 to 1.1:1.

[0041] An advantage of the above-described aspect of the present invention is that the lateral stiffness continues to improve according to the order of the regions described above.

[0042] A device according to the invention is preferred as described above or as described above as preferred, wherein the first rubber mixture has a Shore hardness in the range of 60 Sh-A to 130 Sh-A, preferably a Shore hardness in the range of 60 Sh-A to 80 Sh-A, measured at 20 °C by means of a durometer according to DIN ISO 7619-1, wherein the ratio between the Shore hardness of the first rubber mixture and the Shore hardness of the second rubber mixture is preferably in the range of 1:2 to 4:1, particularly preferably in the range of 1:1.5 to 2:1, very particularly preferably in the range of 1:1.1 to 1.5:1, in particular very particularly preferably in the range of 1:1.1 to 1.1:1, and the second rubber mixture has a Shore hardness of greater than 30 Sh-A, preferably a Shore hardness in the range of 40 Sh-A to 89 Sh-A, particularly preferably a Shore hardness in the range of 65 Sh-A to 80 Sh-A, each measured at 20 °C using a durometer according to DIN ISO 7619-1, whereby the ratio between the Shore hardness of the first rubber compound and the Shore hardness of the second rubber compound is preferably in the range of 1:2 to 4:1,particularly preferably in the range from 1:1.5 to 2:1, very particularly preferably in the range from 1:1.1 to 1.5:1, in particular very particularly preferably in the range from 1:1.1 to 1.1:1.

[0043] An advantage of the above-described aspect of the present invention is that the lateral stiffness continues to improve according to the order of the regions described above.

[0044] A device according to the invention is preferred as described above or as described above as preferred, wherein the ratio between the Shore hardness of the first rubber mixture and the Shore hardness of the second rubber mixture is in the range from 1:2 to 4:1, preferably in the range from 1:1.5 to 2:1, particularly preferably in the range from 1:1.1 to 1.5:1, very particularly preferably in the range from 1:1.1 to 1.1:1.

[0045] An advantage of the above-described aspect of the present invention is that the lateral stiffness continues to improve according to the order of the regions described above.

[0046] A device according to the invention is preferred as described above or as described above as preferred, wherein the first rubber mixture has a Shore hardness in the range from 60 Sh-A to 130 Sh-A and the second rubber mixture has a Shore hardness of greater than 30 Sh-A, preferably the first rubber mixture has a Shore hardness in the range from 60 Sh-A to 130 Sh-A and the second rubber mixture has a Shore hardness in the range from 40 Sh-A to 89 Sh-A, very preferably the first rubber mixture has a Shore hardness in the range from 60 Sh-A to 80 Sh-A and the second rubber mixture has a Shore hardness in the range from 65 Sh-A to 80 Sh-A, measured at 20 °C by means of a durometer according to DIN ISO 7619-1.

[0047] An advantage of the above-described aspect of the present invention is that the lateral stiffness continues to improve according to the order of the regions described above.

[0048] A device according to the invention is preferred as described above or as described above as preferred, wherein the first rubber mixture has a rebound resilience of greater than 50%, preferably in the range of over 50% to 90%, particularly preferably in the range of over 65% to 80%, measured at 20 °C according to DIN 53512, and / or the second rubber mixture has a rebound resilience of less than 80%, preferably in the range of 20% to 64%, preferably in the range of 55% to 64%, each measured at 20 °C according to DIN 53512.

[0049] An advantage of the above-described aspect of the present invention is that the rolling resistance of pneumatic vehicle tires according to the invention with the rim rubber parts described above is further improved compared to other pneumatic vehicle tires according to the invention, while the lateral stiffness is not impaired.

[0050] A device according to the invention is preferred as described above or as described above as preferred, wherein the ratio between the width of the first rim rubber part to the height of the first rim rubber part is in the range from 1:1 to 1:10, preferably in the range from 1:3 to 1:7.

[0051] An advantage of the above-described aspect of the present invention is that pneumatic vehicle tires according to the invention with the above-described ratios have an even better rolling resistance and / or an even better lateral stiffness than other pneumatic vehicle tires according to the invention.

[0052] A device according to the invention is preferred as described above or as described above as preferred, wherein the ratio between the height of the first rim rubber part to the nominal height of the pneumatic vehicle tire is in the range from 1:1 to 1:10, preferably in the range from 1:3 to 1:7.

[0053] An advantage of the above-described aspect of the present invention is that pneumatic vehicle tires according to the invention with the above-described ratios have an even better rolling resistance and / or an even better lateral stiffness than other pneumatic vehicle tires according to the invention.

[0054] Particularly preferred is a pneumatic vehicle tire according to the invention as described above, comprising: two bead regions with bead cores, a carcass insert running around the bead cores with carcass folds extending towards the sidewalls, one rim rubber in each of the two bead regions of the pneumatic vehicle tire, each of the two rim rubbers forming the outer surface of the bead region and consisting of a first rim rubber part consisting of a first rubber mixture and a second rim rubber part consisting of a second rubber mixture, the first rim rubber part of each rim rubber running along the carcass fold and the second rim rubber part of each rim rubber being designed such that, after being mounted on a rim, it is arranged at least partially between the bead cores and the rim, characterized in that the first rubber compound has a rebound elasticity at 20 °C according to DIN 53512 of between 20% and 80%, preferably between 65% and 80%, where the first and second rubber mixtures consist of natural rubber and butadiene rubber and comprise a natural rubber in amounts of 15 to 35 phr and a butadiene rubber in amounts of 65 to 85 phr, the first rubber mixture of the first rim rubber part comprises carbon black, wherein the carbon black is present in an amount of 50 to 110 phr, the total amount of zinc oxide and stearic acid in the second rubber mixture of the second rim rubber part is in the range of 5 to 9 phr and the total amount of zinc oxide and stearic acid in the first rubber mixture of the first rim rubber part is in the range of 10 to 15 phr, the total amount of sulfur in the second rubber mixture of the second rim rubber part is in the range of 1 to 2.5 phr and the total amount of sulfur in the first rubber mixture of the first rim rubber part is in the range of 3 to 5 phr, the first rubber mixture of the first rim rubber part is optional contains other vulcanizing agents besides sulfur,wherein the total amount of the further vulcanizing agent is in the range of 3 to 6 phr, the first and second rubber mixtures do not contain any resin, the ratio between the width of the first rim rubber part and the height of the first rim rubber part is in the range of 1:1 to 1:10, and the ratio between the height of the first rim rubber part and the nominal height of the pneumatic vehicle tire is in the range of 1:1 to 1:10.

[0055] A particularly high degree of preference is also given to a pneumatic vehicle tire according to the invention as described above, comprising: two bead regions with bead cores, a carcass insert running around the bead cores with carcass folds extending towards the sidewalls, one rim rubber in each of the two bead regions of the pneumatic vehicle tire, each of the two rim rubbers forming the outer surface of the bead region and consisting of a first rim rubber part consisting of a first rubber mixture and a second rim rubber part consisting of a second rubber mixture, the first rim rubber part of each rim rubber running along the carcass fold and the second rim rubber part of each rim rubber being designed such that, after being mounted on a rim, it is arranged at least partially between the bead cores and the rim, characterized in that the first rubber compound has a rebound elasticity at 20 °C according to DIN 53512 which is in the range of more than 65% to 80%, where the first and second rubber mixtures consist of natural rubber and butadiene rubber, the second rubber mixture has a Shore hardness in the range of 65 Sh-A to 80 Sh-A, the first rubber mixture has a Shore hardness in the range of 60 Sh-A to 80 Sh-A, measured at 20 °C by means of a durometer in accordance with DIN ISO 7619-1, the second rubber mixture of the first rim rubber part has a rebound resilience in the range of 20% to 65%, measured at 20 °C in accordance with DIN 53512, the ratio between the width of the first rim rubber part and the height of the first rim rubber part is in the range of 1:1 to 1:10, and the ratio between the height of the first rim rubber part and the nominal height of the pneumatic vehicle tire is in the range of 1:1 to 1:10.

[0056] The advantageous aspects of a pneumatic vehicle tire according to the invention in radial design described above also apply to all aspects of a vehicle wheel system described below and the advantageous aspects of vehicle wheel systems according to the invention discussed below apply accordingly to all aspects of a pneumatic vehicle tire according to the invention in radial design.

[0057] The invention also relates to a vehicle wheel system comprising a rim and a pneumatic vehicle tire mounted on the rim as described above or as described above as preferred, wherein the second rim rubber part of the pneumatic vehicle tire is arranged at least partially between the bead cores and the rim.

[0058] A vehicle wheel system according to the invention is preferred as described above or as described above as preferred, wherein the first rim rubber part extends in the direction of the sidewall beyond the rim flange of the rim and into contact with it.

[0059] An advantage of the above-described aspect of the present invention is that the lateral stiffness can be improved compared to pneumatic vehicle tires in which the second rim rubber part does not extend towards the sidewall beyond and into contact with the rim flange of the rim.

[0060] The above-described advantageous aspects of a pneumatic vehicle tire of radial design according to the invention and of a vehicle wheel system according to the invention also apply to all aspects of a use described below, and the advantageous aspects of uses according to the invention discussed below apply accordingly to all aspects of a pneumatic vehicle tire of radial design according to the invention and of a vehicle wheel system according to the invention.

[0061] The invention also relates to the manufacture of a pneumatic vehicle tire as described above or as described above as preferred or of a vehicle wheel system as described above or as described above as preferred. Character description:

[0062] It shows: Figure 1: A cross-sectional view through a bead region of a vehicle wheel system according to the invention in a first embodiment, wherein the second rim rubber part of the rim rubber forms the entire outer surface of the bead region; Figure 2: A cross-sectional view through a bead region of a vehicle wheel system according to the invention in a first embodiment, wherein the first rim rubber part forms one part of the outer surface of the bead region and the second rim rubber part of the rim rubber forms the other part of the outer surface of the bead region.

[0063] Figure 1 shows a schematic representation of a bead region 8 of a vehicle wheel system according to the invention in a first embodiment, comprising: a bead core 3, a carcass insert 4 extending around the bead core 3 with a carcass turn-up 4a extending towards the sidewall 5, a rim rubber 7 consisting of a first and a second rim rubber part 7a, 7b, wherein the second rim rubber part 7b of the rim rubber 7 forms the entire outer surface 9 of the bead region 8 and consists of a second rubber mixture and the first rim rubber 7a consists of a first rubber mixture, wherein the first rim rubber part 7a of the rim rubber 7 runs along the carcass turn-up 4a and the second rim rubber part 7b of the rim rubber 7 is arranged between the bead core 3 and the rim 1, where the first rim rubber part 7a extends in the direction of the side wall 5 beyond the rim flange 1a of the rim 1 and in contact with this rim flange 1a, the ratio between the width 10 of the first rim rubber part 7a to the height 11 of the first rim rubber part 7a is in the range from 1:1 to 1:10 and the ratio between the height 11 of the first rim rubber part 7a to the nominal height of the pneumatic vehicle tire is in the range from 1:1 to 1:10.

[0064] In Figure 1 the core profile 6 and the inner layer 2 of the pneumatic vehicle tire according to the invention as well as the other part of the rim 1, the rim section 1b, are shown.

[0065] Figure 2 shows a schematic representation of a bead region 8 of a vehicle wheel system according to the invention in a further embodiment, comprising: a bead core 3, a carcass insert 4 running around the bead core 3 with a carcass turn-up 4a extending in the direction of the sidewall 5, a rim rubber 7 consisting of a first and a second rim rubber part 7a, 7b, wherein the first rim rubber part 7a consists of a first rubber mixture and forms one part 9a of the outer surface 9 of the bead region 8 and the second rim rubber part 7b of the rim rubber 7 forms the other part 9b of the outer surface 9 of the bead region 8 and consists of a second rubber mixture, wherein the first rim rubber part 7a of the rim rubber 7 runs along the carcass turn-up 4a and the second rim rubber part 7b of the rim rubber 7 is arranged between the bead core 3 and the rim 1.

[0066] In Figure 2 the core profile 6 and the inner layer 2 of the pneumatic vehicle tire according to the invention as well as the other part of the rim 1, the rim section 1b, are shown. Experimental examples: Measurement methods: 1. Shore A hardness

[0067] The results were determined at 20 °C using a durometer according to DIN ISO 7619-1. 2. Rebound resilience

[0068] The results were determined at 20 °C according to the DIN 53512 method. 3. Rolling resistance

[0069] The results were determined according to the ISO 28580 method. 4. Lateral stiffness Cy

[0070] The results were determined following the method as described in paragraph

[0028] of the patent specification DE 102013004596 B4. Production:

[0071] Production of a rubber compound for a tire according to the invention: The rubber compound is produced in a conventional manner, whereby a base compound containing all components except the vulcanization system (sulfur and vulcanization-influencing substances) is initially prepared in one or more mixing stages. The final compound is then produced by adding the vulcanization system. The mixture is then further processed.

[0072] The compounds were prepared under standard conditions in several stages in a laboratory tangential mixer. Test specimens were prepared from all compounds by vulcanization under pressure at 160 °C for 20 minutes.

[0073] Production of a tire according to the invention: The rubber compounds specified above were then incorporated into a standard tire with the product name CEC6 in a conventional and known manner. The tires thus obtained were then tested for rolling resistance and lateral stiffness according to the respective measurement methods specified. Results:

[0074] Table 1: Experimental data of the rubber mixtures used for use in rim rubbers of the pneumatic vehicle tires according to the invention and not according to the invention according to Table 2 below Rubber compounds Name: E1 E2 E3 Components Unit Natural rubber phr 25 25 25 Butadiene rubber phr 75 75 75 soot phr 65 55 70 Anti-aging agents and processing aids phr 10 10 10 resin phr 0 0 10 Zinc oxide and stearic acid phr 6 6 10 Vulcanization accelerator phr 4 4 4 sulfur phr 1 3,5 3,5 Mixing properties Shore A hardness Sh-A 73 73 90 Rebound resilience % 58 73 40 Table 2: Experimental data of the pneumatic vehicle tires according to the invention and not according to the invention with the different rim rubbers, also called rim strips. Pneumatic vehicle tires Name: Multi2 Single1 Multi1 According to the invention Not inventive According to the invention Rubber compounds of the rim rubber parts Rubber compound of the 1st rim rubber part* 7a E3 E1 E2 Rubber compound of the 2nd rim rubber part** 7b E1 E1 E1 Tire properties Unit Lateral stiffness % 125 100 100 Rolling resistance % 98 100 103 * The first rim rubber part corresponds to the bead part of a vehicle tire, which is shown in the above list of reference symbols and in the Figure 1 designated by the reference numeral 7a. ** The second rim rubber part corresponds to the bead part of a vehicle tire, which is shown in the above list of reference numerals and in the Figure 1 designated by the reference number 7a.

[0075] The advantages of a pneumatic vehicle tire according to the invention are clearly shown in Table 2. Depending on the requirements of a pneumatic vehicle tire according to the invention, 1. its rolling resistance by adjusting the Shore hardness of the rubber compound of the first rim rubber part (compare the columns Single1 and Multi2 in Table 2) and / or 2. its lateral stiffness by adjusting the rebound resilience of the rubber compound of the first rim rubber part (compare the columns Single1 and Multi2 in Table 2) be improved.

[0076] By increasing the rebound resilience of the rubber compound of the first rim rubber part, the desired rolling resistance of a pneumatic vehicle tire according to the invention can be improved (see columns E1 and E2 in Table 1). However, it is also possible to increase the lateral stiffness of a pneumatic vehicle tire according to the invention by increasing the Shore hardness of the rubber compound of the first rim rubber part (see columns E1 and E3 in Table 1). This allows both the rolling resistance and the lateral stiffness of a vehicle tire according to the invention to be precisely adjusted. In particular, it is possible to produce pneumatic vehicle tires with increased lateral stiffness without a deterioration in rolling resistance (see columns Single1 and Multi1 in Table 2). List of reference symbols

[0077] 1 Rim of a vehicle wheel system according to the invention 1a Rim flange 1b Rim section 2 Inner layer 3 Bead core 4 Carcass insert 4a Carcass turn-up 5 Sidewall 6 Core profile 7, 7' Rim rubber in the respective bead region of the two bead regions of a pneumatic vehicle tire according to the invention 7a First rim rubber part made of first rubber mixture 7b Second rim rubber part made of second rubber mixture 8 Bead region of a pneumatic vehicle tire according to the invention of a vehicle wheel system according to the invention 9 Outer surface of the bead region 9a Part of the outer surface of the bead region 9b Other part of the outer surface of the bead region 10 Width of the first rim rubber part 11 Height of the first rim rubber part

Claims

1. Pneumatic vehicle tyre of a radial type of construction, comprising - two bead regions (8) with bead cores (3), - a carcass insert (4) running around the bead cores (3) and comprising carcass turn-ups (4a) extending in the direction of the sidewalls (5), - at least one rubber rim strip (7), which forms the outer surface (9) of a bead region (8) and consists of a first rubber rim strip part (7a), consisting of a first rubber compound, and a second rubber rim strip part (7b), consisting of a second rubber compound, wherein - the first rubber rim strip part (7a) runs along the carcass turn-up (4a) and - the second rubber rim strip part (7b) is designed such that, after pulling onto a rim (1), it is at least partially positioned between the bead cores (3) and the rim (1), characterized in that the first rubber compound has a rebound elasticity at 20°C according to DIN 53512 in the range of 20% and 80% and the rebound elasticity of the second rubber compound, likewise measured at 20°C according to DIN 53512, differs from the rebound elasticity of the first rubber compound.

2. Pneumatic vehicle tyre according to Claim 1, wherein the pneumatic vehicle tyre has a respective rubber rim strip (7) in each of the two bead regions (8) of the pneumatic vehicle tyre, wherein each of the two rubber rim strips (7) forms the respective outer surface (9) of the bead region (8) and consists of a first rubber rim strip part (7a), consisting of a first rubber compound, and a second rubber rim strip part (7b), consisting of a second rubber compound, wherein - the first rubber compound of the one rubber rim strip (7) is the same rubber compound as the first rubber compound of the other rubber rim strip (7'), - the second rubber compound of the one rubber rim strip (7) is the same rubber compound as the second rubber compound of the other rubber rim strip (7'), - the first rubber rim strip part (7a) of each rubber rim strip (7, 7') runs along the respective carcass turn-up (4a) and - the second rubber rim strip part (7b) of each rubber rim strip is designed such that, after pulling onto a rim (1), the second rubber rim strip part (7b) is at least partially positioned between the respective bead core (3) and the rim (1).

3. Pneumatic vehicle tyre according to either of the preceding claims, wherein the ratio of the rebound elasticity of the first rubber compound to the rebound elasticity of the second rubber compound is in the range of 1:2 to 2:1, preferably in the range of 1.01:1 to 2:1, particularly preferably in the range of 1.1:1 to 1.5:1.

4. Pneumatic vehicle tyre according to one of the preceding claims, wherein the first rubber compound comprises a natural rubber and / or a butadiene rubber or consists of natural rubber and butadiene rubber, and / or the first and / or second rubber compound comprises a natural rubber in amounts of 10 to 50 phr and / or a butadiene rubber in amounts of 50 to 90 phr, preferably a natural rubber in amounts of 15 to 35 phr and / or a butadiene rubber in amounts of 65 to 85 phr.

5. Pneumatic vehicle tyre according to one of the preceding claims, wherein the first and / or second rubber compound comprises a filler, preferably carbon black, wherein the filler is particularly preferably present in an amount of 20 to 180 phr, more particularly preferably in an amount of 40 to 110 phr, in particular more particularly preferably in an amount of 60 to 80 phr.

6. Pneumatic vehicle tyre according to one of the preceding claims, wherein the first and / or second rubber compound comprises zinc oxide and stearic acid, wherein preferably the total amount of zinc oxide and stearic acid is in the range of 1 to 30 phr, particularly preferably in an amount of 1 to 20 phr, more particularly preferably in an amount of 5 to 9 phr, or more particularly preferably the total amount of zinc oxide and stearic acid in the second rubber compound is in the range of 5 to 9 phr and the total amount of zinc oxide and stearic acid in the first rubber compound is in the range of 10 to 15 phr.

7. Pneumatic vehicle tyre according to one of the preceding claims, wherein the first and / or second rubber compound - comprises sulfur, wherein the total amount of sulfur is preferably in the range of 1 to 10 phr, particularly preferably in an amount of 1 to 5 phr, wherein more particularly preferably the total amount of sulfur in the second rubber compound is in the range of 1 to 2.5 phr and the total amount of sulfur in the first rubber compound is in the range of 3 to 5 phr, and / or - comprises further vulcanizing agents other than sulfur, wherein the total amount of the further vulcanizing agents is preferably in the range of 1 to 10 phr, particularly preferably in an amount of 3 to 6 phr.

8. Pneumatic vehicle tyre according to one of the preceding claims, wherein - the first rubber compound comprises a resin, wherein the resin is present preferably in an amount of 1 to 30 phr, particularly preferably in an amount of 5 to 15 phr, more particularly preferably in an amount of 1 to 9 phr, and / or - the first and / or the second rubber compound comprises a resin, wherein the resin is preferably present in an amount of 0 to 4 phr and particularly preferably there is no resin at all in the second rubber compound.

9. Pneumatic vehicle tyre according to one of the preceding claims, wherein - the first rubber compound has a Shore hardness in the range of 60 Sh A to 130 Sh A, preferably a Shore hardness in the range of 60 Sh A to 80 Sh A, measured at 20°C by means of a durometer according to DIN ISO 7619-1, and / or - the second rubber compound has a Shore hardness of greater than 30 Sh A, preferably a Shore hardness in the range of 40 Sh A to 89 Sh A, particularly preferably a Shore hardness in the range of 65 Sh A to 80 Sh A, in each case measured at 20°C by means of a durometer according to DIN ISO 7619-1.

10. Pneumatic vehicle tyre according to one of the preceding claims, wherein the ratio of the Shore hardness of the first rubber compound to the Shore hardness of the second rubber compound is in the range of 1:2 to 4:1, preferably in the range of 1:1.5 to 2:1, particularly preferably in the range of 1:1.1 to 1.5:1, more particularly preferably in the range of 1:1.1 to 1.1:1, in each case measured at 20°C by means of a durometer according to DIN ISO 7619-1.

11. Pneumatic vehicle tyre according to one of the preceding claims, wherein - the first rubber compound has a rebound elasticity of greater than 50%, preferably in the range of above 50% to 90%, particularly preferably in the range of above 65% to 80%, measured at 20°C according to DIN 53512, and / or - the second rubber compound has a rebound elasticity of less than 80%, preferably in the range of 20% to 64%, preferably in the range of 55% to 64%, in each case measured at 20°C according to DIN 53512.

12. Pneumatic vehicle tyre according to one of the preceding claims, wherein - the ratio of the width (10) of the first rubber rim strip part (7a) to the height (11) of the first rubber rim strip part (7a) is in the range of 1:1 to 1:10, preferably in the range of 1:3 to 1:7, and / or - the ratio of the height (11) of the first rubber rim strip part (7a) to the nominal height of the pneumatic vehicle tyre is in the range of 1:1 to 1:10, preferably in the range of 1:3 to 1:7.

13. Vehicle wheel system, comprising a rim (1) and a pneumatic vehicle tyre, pulled onto the rim (1), according to one of the preceding claims, wherein the second rubber rim strip part (7b) of the pneumatic vehicle tyre is at least partially positioned between the bead cores (3) and the rim (1).

14. Vehicle wheel system according to the preceding claim, wherein the first rubber rim strip part (7a) extends in the direction of the sidewall (5) beyond the rim flange (1a) of the rim (1) and in contact therewith (1a).

15. Production of a pneumatic vehicle tyre according to one of preceding Claims 1 to 12 or a vehicle wheel system according to either of preceding Claims 13 and 14.