RADIAL VEHICLE TIRE HAVING A RUBBER RIM STRIP, USE OF A RUBBER RIM STRIP, AND A VEHICLE WHEEL SYSTEM COMPRISING THE RADIAL VEHICLE TIRE

Abstract

The invention relates to a pneumatic vehicle tire of a radial type of construction, comprising two bead regions with bead cores, a carcass insert running around the bead cores and comprising carcass turn-ups extending in the direction of the sidewalls, at least one rubber rim strip, which forms the outer surface of a bead region and consists of a first rubber rim strip part, consisting of a first rubber compound, and a second rubber rim strip part, consisting of a second rubber compound, wherein the first rubber rim strip part runs along the carcass turn-up and the second rubber rim strip part is designed such that, after pulling onto a rim, it is at least partially positioned 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 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.

The invention also relates to a use of a rubber rim strip and to a vehicle wheel system comprising a pneumatic vehicle tire of a radial type of construction.

Claims

1.-15. (canceled)

16. A pneumatic vehicle tire having a radial type construction, the tire comprising: a bead region having a bead core; a carcass insert running around the bead core and comprising a carcass turn-up extending in a direction of sidewalls; a rubber rim strip that forms an outer surface of the bead region, the rubber rim strip comprising: a first rubber rim strip consisting of a first rubber compound and runs along the carcass turn-up; a second rubber rim strip consisting of a second rubber compound and is at least partially positioned between the bead core and a rim; and 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 measured at 20° C. according to DIN 53512 differs from the rebound resilience of the first rubber compound.

17. The tire of claim 16, further comprising a second bead region having a second bead core and a second rubber rim strip that forms an outer surface of the second bead region, the second rubber rim strip comprising: a first rubber rim strip consisting of the first rubber compound; a second rubber rim strip consisting of the second rubber compound and is at least partially positioned between the bead core and a rim.

18. The tire of claim 16, wherein a ratio of a rebound resilience of the first rubber compound to a rebound resilience of the second rubber compound is in the range of 1:2 to 2:1.

19. The tire of claim 16, a ratio of a rebound resilience of the first rubber compound to a rebound resilience of the second rubber compound is in the range of 1.1:1 to 1.5:1.

20. The tire of claim 16, wherein the first rubber compound comprises one of a natural rubber and/or a butadiene rubber or consists of natural rubber and butadiene rubber, and/or the first and the 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.

21. The tire of claim 16, wherein the first and the second rubber compound comprise a filler present in an amount of 20 to 180 phr.

22. The tire of claim 16, wherein the first and the second rubber compound comprise a filler in an amount of 60 to 80 phr and the filler is carbon black.

23. The tire of claim 16, wherein the first and the second rubber compound comprise zinc oxide and stearic acid.

24. The tire of claim 23, the stearic acid is in the range of 5 to 9 phr.

25. The tire of claim 24, a total amount of zinc oxide and the stearic acid in the first rubber compound is in the range of 10 to 15 phr.

26. The tire of claim 16, wherein the first and the second rubber compound comprise sulfur and the total amount of sulfur in the second 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 the first and second rubber compounds comprise vulcanizing agents in addition to sulfer and in the range of 3 to 6 phr.

27. The tire of claim 16, wherein the first rubber compound comprises a resin, wherein the resin is present in an amount of 1 to 9 phr, and the second rubber compound comprises a resin present in an amount of 0 to 4 phr.

28. The tire of claim 16, wherein the first rubber compound has 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 the second rubber compound has a Shore hardness in the range of 65 Sh A to 80 Sh A, measured at 20° C. by means of a durometer according to DIN ISO 7619-1.

29. The tire of claim 16, 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.

30. The tire of claim 16, 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 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.

31. The tire of claim 16, wherein a ratio of a width of the first rubber rim strip part to a height of the first rubber rim strip part is in the range of 1:3 to 1:7, and a ratio of the height of the first rubber rim strip part to a nominal height of the tire is in the range of 1:3 to 1:7.

32. The tire of claim 17, the rubber resilience of the first rubber compound is configured to provide a selected rolling resistance of the tire independent of the rubber resilience of the second compound.

33. The tire of claim 32, the rubber resilience of the second compound is configured to provide a selected lateral stiffness of the tire independent of the rubber resilience of the first compound.

Description

DESCRIPTION OF THE FIGURES

[0110] In the figures:

[0111] FIG. 1: shows a cross-sectional view through a bead region of a vehicle wheel system according to the invention in a first embodiment, wherein the second rubber rim strip part of the rubber rim strip forms the entire outer surface of the bead region;

[0112] FIG. 2: shows a cross-sectional view through a bead region of a vehicle wheel system according to the invention in a first embodiment, wherein the first rubber rim strip part forms the one part of the outer surface of the bead region and the second rubber rim strip part of the rubber rim strip forms the other part of the outer surface of the bead region.

[0113] FIG. 1 shows a schematic depiction of a bead region 8 of a vehicle wheel system according to the invention in a first embodiment, comprising: [0114] a bead core 3, [0115] a carcass insert 4 running around the bead core 3 and comprising a carcass turn-up 4a extending in the direction of the sidewall 5, [0116] a rubber rim strip 7 composed of a first and a second rubber rim strip part 7a, 7b, wherein the second rubber rim strip part 7b of the rubber rim strip 7 forms the entire outer surface 9 of the bead region 8 and consists of a second rubber compound and the first rubber rim strip 7a consists of a first rubber compound, wherein [0117] the first rubber rim strip part 7a of the rubber rim strip 7 runs along the carcass turn-up 4a and [0118] the second rubber rim strip part 7b of the rubber rim strip 7 is positioned between the bead core 3 and the rim 1,

[0119] wherein [0120] 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 with this rim flange 1a, [0121] 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,

[0122] and [0123] the ratio of the height 11 of the first rubber rim strip part 7a to the nominal height of the pneumatic vehicle tire is in the range of 1:1 to 1:10.

[0124] FIG. 1 moreover shows the core profile 6 and the inner layer 2 of the pneumatic vehicle tire according to the invention and also the other part of the rim 1, the rim portion 1b.

[0125] FIG. 2 shows a schematic depiction of a bead region 8 of a vehicle wheel system according to the invention in a further embodiment, comprising: [0126] a bead core 3, [0127] a carcass insert 4 running around the bead core 3 and comprising a carcass turn-up 4a extending in the direction of the sidewall 5, [0128] a rubber rim strip 7 composed of a first and a second rubber rim strip part 7a, 7b, wherein [0129] the first rubber rim strip part 7a consists of a first rubber compound and forms the one part 9a of the outer surface 9 of the bead region 8 and [0130] the second rubber rim strip part 7b of the rubber rim strip 7 forms the other part 9b of the outer surface 9 of the bead region 8 and consists of a second rubber compound,

[0131] wherein [0132] the first rubber rim strip part 7a of the rubber rim strip 7 runs along the carcass turn-up 4a and [0133] the second rubber rim strip part 7b of the rubber rim strip 7 is positioned between the bead core 3 and the rim 1.

[0134] FIG. 2 moreover shows the core profile 6 and the inner layer 2 of the pneumatic vehicle tire according to the invention and also the other part of the rim 1, the rim portion 1b.

Experimental Examples

[0135] Test Methods:

[0136] 1. Shore A Hardness [0137] The results were ascertained at 20° C. by means of a durometer according to DIN ISO 7619-1.

[0138] 2. Rebound Elasticity [0139] The results were ascertained at 20° C. on the basis of the DIN 53512 method.

[0140] 3. Rolling Resistance [0141] The results were ascertained on the basis of the ISO 28580 method.

[0142] 4. Lateral Stiffness Cy [0143] The results were ascertained on the basis of the method as in paragraph [0028] of the patent document DE 102013004596 B4.

Production:

Production of a Rubber Compound for a Tire According to the Invention:

[0144] The production of the rubber compound according to the invention is carried out conventionally, wherein first of all as a rule a base compound containing all the constituents with the exception of the vulcanization system (sulfur and vulcanization-influencing substances) is produced in one or more mixing stages and then the finished compound is produced by adding the vulcanization system. The compound is then subjected to further processing.

[0145] The compound was produced under standard conditions in multiple stages in a laboratory tangential mixer. Test specimens were produced from all the compounds by vulcanization for 20 minutes under pressure at 160° C.

Production of a Tire According to the Invention:

[0146] The rubber compounds as specified above were then added to a standard tire with the product name CEC6 in a conventional and known way. The tire thus obtained then had its rolling resistance and its lateral stiffness examined according to the respectively specified test methods.

Results:

[0147]

TABLE-US-00001 TABLE 1 Experimental data of the rubber compounds used for use in rubber rim strips of the inventive and the non-inventive pneumatic vehicle tire according to the following table 2 Rubber compounds Name: E1 E2 E3 Constituents Unit Natural rubber phr 25 25 25 Butadiene rubber phr 75 75 75 Carbon black phr 65 55 70 Aging stabilizers and phr 10 10 10 processing aids Resin phr 0 0 10 Zinc oxide and stearic phr 6 6 10 acid Vulcanization phr 4 4 4 accelerator Sulfur phr 1 3.5 3.5 Compound properties Shore A hardness Sh A 73 73 90 Rebound elasticity % 58 73 40

TABLE-US-00002 TABLE 2 Experimental data of the inventive and the non-inventive pneumatic vehicle tires having the different rubber rim strips. Pneumatic vehicle tire Name: Multi2 Single1 Multi1 Inv. Non-inv. Inv. Rubber compounds of the rubber rim strip parts Rubber compound of 7a E3 E1 E2 the 1st rubber rim strip part* Rubber compound of 7b E1 E1 E1 the 2nd rubber rim strip part** Tire properties Unit Lateral stiffness % 125 100 100 Rolling resistance %  98 100 103 *The first rubber rim strip part corresponds to the bead part of a vehicle tire, which is denoted by the reference sign 7a in the above list of reference signs and in FIG. 1. **The second rubber rim strip part corresponds to the bead part of a vehicle tire, which is denoted by the reference sign 7a in the above list of reference signs and in FIG. 1.

[0148] In table 2, the advantages of a pneumatic vehicle tire according to the invention can best be seen. Depending on the requirements for a pneumatic vehicle tire according to the invention, it is possible for [0149] 1. its rolling resistance, by adjusting the Shore hardness of the rubber compound of the first rubber rim strip part (compare the columns Single1 and Multi2 in table 2), and/or [0150] 2. its lateral stiffness, by adjusting the rebound elasticity of the rubber compound of the first rubber rim strip part (compare the columns Single1 and Multi2 in table 2),
to be improved.

[0151] Increasing the rebound elasticity of the rubber compound of the first rubber rim strip part therefore makes it possible to improve the desired rolling resistance of a pneumatic vehicle tire according to the invention (compare 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 rubber rim strip part (compare columns E1 and E3 in table 1). This makes it possible to exactly set both the rolling resistance and the lateral stiffness of a vehicle tire according to the invention. In particular, it is possible to produce pneumatic vehicle tires with increased lateral stiffness without impairing the rolling resistance (compare columns Single1 and Multi1 in table 2).

LIST OF REFERENCE SIGNS

[0152] 1 Rim of a vehicle wheel system according to the invention [0153] 1a Rim flange [0154] 1b Rim portion [0155] 2 Inner layer [0156] 3 Bead core [0157] 4 Carcass insert [0158] 4a Carcass turn-up [0159] 5 Sidewall [0160] 6 Core profile [0161] 7, 7′ Rubber rim strip in the respective bead region of the two bead regions of a pneumatic vehicle tire according to the invention [0162] 7a First rubber rim strip part made of first rubber compound [0163] 7b Second rubber rim strip part made of second rubber compound [0164] 8 Bead region of a pneumatic vehicle tire according to the invention of a vehicle wheel system according to the invention [0165] 9 Outer surface of the bead region [0166] 9a One part of the outer surface of the bead region [0167] 9b Other part of the outer surface of the bead region [0168] 10 Width of the first rubber rim strip part [0169] 11 Height of the first rubber rim strip part