PNEUMATIC VEHICLE TIRE OF RADIAL DESIGN FOR UTILITY VEHICLE TIRES

Abstract

A pneumatic vehicle tire of radial type of construction for utility vehicles, in particular trucks, buses and truck trailers, having a belt which has three or more belt plies (5, 6, 7, 8, 9) with steel cords (10), wherein each steel cord (10) has at least two strands (11) and wherein each strand (11) has at least two steel filaments (12); the invention is characterized in that steel cords (10) of the construction 2 to 4×N, where N=2 to 5, are at least arranged in one of the belt plies (5, 6, 7, 8, 9), wherein this construction means that this steel cord (10) has 2 to 4 twisted-together strands (11), wherein each strand (10) comprises 2 to 5 steel filaments (12) which are twisted together such that these 2 to 5 steel filaments (12) are arranged without a core filament.

Claims

1-8. (canceled)

9. A pneumatic vehicle tire of radial type of construction, the tire comprising: a belt having three or more belt plies (4) with steel cords (10), each steel cord (10) has at least two strands (11) and wherein each strand (11) has at least two steel filaments (12); the steel cords (10) are of the construction 2 to 4×N, where N=2 to 5, are arranged in the belt plies (4); the steel cords (10) have 2 to 4 twisted-together strands (11); and each strand (10) comprises 2 to 5 steel filaments (12) twisted together and arranged without a core filament.

10. The pneumatic vehicle tire as claimed in claim 9, the steel cords (10) have the construction N=4.

11. The pneumatic vehicle tire as claimed in claim 10, a filament diameter (13) of each steel filament (12) is identical and between 0.26-0.29 mm.

12. The pneumatic vehicle tire of claim 11, the elongation at 100 N of this non-rubberized steel cord is 2% to 3%, the above-stated elongation of this non-rubberized steel cord is ascertained in accordance with ASTM D 2969.

13. The pneumatic vehicle tire of claim 12, the steel cords (10) have the construction 3×4×0.29.

14. The pneumatic vehicle tire of claim 9, the steel cords (10) have the construction 4×4×0.26 mm, the elongation at 100 N of this non-rubberized steel cord is 2% to 3%, the above-stated elongation of the non-rubberized steel cord is ascertained in accordance with ASTM D 2969.

15. The pneumatic vehicle tire of claim 14, the three or more plies comprise a four-ply belt (5, 6, 7, 8) with two working plies, one barrier ply and one 0° ply, the steel cords are arranged in the 0° ply.

16. The pneumatic vehicle tire of claim 9, the three or more plies comprise five belt plies (5, 6, 7, 8, 9) that comprise two working plies (6, 8), one barrier ply (5), one protective ply (9), and one 0° ply (7), and the steel cords (10) are arranged in the 0° ply (7).

17. The pneumatic vehicle tire of claim 9, the tire incorporated into one of a utility vehicle, truck, bus, and truck trailer.

18. The pneumatic vehicle tire of claim 15, the tire comprising a carcass insert (3) adjacent and radially inner of the barrier ply (5) and an inner layer (2) radially inner of the carcass insert (3).

19. The pneumatic vehicle tire of claim 18, the tire comprising a tread (1) radially outer from the protective ply (9).

20. The pneumatic vehicle tire of claim 19, the steel cords (10) for each ply of the four-ply belt are inclined at particular angles relative to the circumferential direction.

21. The pneumatic vehicle tire of claim 20, a steel cord of the barrier ply has a right-hand pitch, a steel cord of the two working plies have a right hand pitch, a steel cord of the one 0° ply is at 0 degrees.

22. The pneumatic vehicle tire of claim 16, the five belt plies are arranged with a first working ply (6) radially on the barrier ply (5), the one 0° ply (7) is radially on the first working ply (6), a second working ply (8) is on the one 0° ply (7) and the protective ply (9) is on the second working ply (8).

23. The pneumatic vehicle tire of claim 22, strength members of the barrier ply are at 48 to 57 degrees, strength members of the one 0° ply are at −5 to 5, strength members of first working ply (6) are at 10 to 45 degrees, strength members of the second working ply are at 10 to 45 degrees, strength members of the protective ply are at 10 to 45 degrees in relation to the circumferential direction.

Description

[0020] Further features, advantages and details of the invention will now be described in more detail on the basis of the schematic drawings, which illustrate exemplary embodiments. In the drawings:

[0021] FIG. 1 shows a partial cross section through a pneumatic vehicle tire according to the invention for utility vehicles in the region of the belt and tread;

[0022] FIG. 2 shows a cross section through a steel cord that is arranged in the protective ply and/or in the 0° ply of the pneumatic vehicle tire of FIG. 1;

[0023] FIG. 3 shows a cross section through another steel cord that is arranged in the protective ply and/or in the 0° ply of the pneumatic vehicle tire of FIG. 1.

[0024] FIG. 1 shows a cross section through the region of the tread and belt of a pneumatic vehicle tire according to the invention for utility vehicles, for example trucks, buses or truck trailers. Of the components that are commonly present in the illustrated region of the pneumatic vehicle tire, a profiled tread 1, an inner layer 2, a carcass insert 3 and a multi-ply belt 4 are shown. Belt padding and the like that is commonly provided between the edge portions of the belt plies, in particular in the region of the belt ply edges, is not shown.

[0025] The belt 4 has five belt plies 5, 6, 7, 8 and 9, wherein the first belt ply is the radially innermost belt ply 5 and is configured as a barrier ply. The second belt ply 6 is a working ply, which is followed by a 0° ply 7, above which the third belt ply 8 is arranged as a working ply. The third belt ply 8 is adjoined by the radially outermost belt ply 9, the protective ply. All belt plies 5, 6, 7, 8 and 9 are composed of strength members embedded in a rubber compound, the so-called belt rubber coating, which strength members run parallel to one another in each ply.

[0026] The strength members in the belt plies 5, 6, 7, 8 and 9 are inclined at particular angles relative to the circumferential direction. Proceeding from the radially innermost belt ply 5, the strength members run in accordance with the sequence right-hand pitch-right-hand pitch-0°-left-hand pitch-left-hand pitch. A 0° belt ply 7 is to be understood to mean a belt ply in which the strength members run in a circumferential direction, and deviate by at most ±5° from the exact 0° orientation. The angle of the strength members in the first belt ply 5 is 45° to 90°, in particular 48° to 57°, the angle of the strength members in the 0° belt ply 7 is 0°±5°, the angles of the strength members in the second and third belt plies (working plies) 6, 8 are in each case 10° to 45°, and the angle of the strength members in the fourth belt ply 9 is likewise 10° to 45°, in each case in relation to the circumferential direction. As already mentioned, the second belt ply 6 and the third belt ply 8 are working plies, and the strength members thereof therefore run at relatively small angles with respect to the circumferential direction, and the plies have oppositely directed pitches.

[0027] Here, the steel cord 10 of FIG. 2 is arranged in the 0° belt ply 7 and/or in the radially outermost belt ply, the protective ply 9, of the utility vehicle tire of FIG. 1. The construction conforms to 3×4×0.29 mm, which means that three strands 11 with in each case 4 steel filaments 12 with a diameter 13 of in each case 0.29 mm are twisted to form a steel cord 10. The elongation at 100 N of the non-rubberized cord is 1% to 4%, wherein the above-stated elongation of the non-rubberized cord is ascertained in accordance with ASTM D 2969.

[0028] Another steel cord 10 is shown in FIG. 3. This is likewise arranged in the 0° belt ply 7 and/or in the radially outermost belt ply, the protective ply 9, of the utility vehicle tire of FIG. 1. The construction conforms to 4×4×0.26 mm, which means that four strands 11 with in each case 4 steel filaments 12 with a diameter 13 of in each case 0.26 mm are twisted to form a steel cord 10.

LIST OF REFERENCE DESIGNATIONS

[0029] 1 . . . Tread [0030] 2 . . . Inner layer [0031] 3 . . . Carcass insert [0032] 4 . . . Belt [0033] 5 . . . First belt ply/barrier ply [0034] 6 . . . Second belt ply/working ply [0035] 7 . . . 0° belt ply [0036] 8 . . . Third belt ply/working ply [0037] 9 . . . Fourth belt ply/protective ply [0038] 10 . . . Steel cord [0039] 11 . . . Strand [0040] 12 . . . Steel filament [0041] 13 . . . Diameter of the steel filament