Pneumatic vehicle tire with specified belt bandage

Abstract

A pneumatic vehicle tire for passenger cars comprises a carcass, a tread, and a belt which has belt plies and which is covered radially outwardly by a belt bandage having strengthening elements oriented approximately in the circumferential direction, the belt bandage comprising at least one belt bandage ply each consisting of a central section and two lateral sections each arranged next to the central section without overlapping the central section, the strengthening elements of the central section being x1 construction and the strengthening elements of each lateral section being identical cords of x2 or higher construction, the density of the strengthening elements in the central section being less than the density of the strengthening elements in the lateral sections, and the axial distance of each lateral section inner end from the closest end of the widest belt ply being 5-30 mm.

Claims

1. A pneumatic vehicle tire for passenger cars comprising: a carcass; a tread; a belt having belt plies and covered radially outwardly by a belt bandage having strengthening elements oriented at an angle of 0 to 5 with respect to a circumferential direction of the tire; the belt bandage comprises a belt bandage ply consisting of a first lateral section, a central section and a second lateral section, the central section between the first lateral section and the second lateral section, the first and second lateral sections arranged next to the central section without overlapping the central section; the density of the strengthening elements in the central section is less than the density of the strengthening elements in the first and second lateral sections; the central strengthening elements are polyethylene terephthalate (PET) and have a x1 construction, and the lateral strengthening elements are identical cords and have a construction of x2 or higher; the axial distance of each lateral section inner end from the closest end of the widest belt ply is 5 mm to 15 mm; and the fineness of each lateral strengthening element is 0-10 percent greater than that of each central strengthening element.

2. The tire of claim 1, wherein the lateral strengthening elements are polyamide 6.6 (PA6.6).

3. The tire of claim 2, wherein the lateral strengthening elements have a x2 construction.

4. The tire of claim 1, wherein the central strengthening elements each have a fineness of 940 dtex.

5. The tire of claim 1, wherein the central strengthening elements each have a twist factor in a range of from 10 to 100, and wherein =twist [t/m](fineness [tex]/1000).sup.1/2.

6. The tire of claim 1, wherein: the lateral strengthening elements are polyamide 6.6 (PA6.6); and the belt bandage construction is 1-1-1.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING(S)

(1) Further features, advantages and details of the invention will now be described in more detail on the basis of the figures, which illustrate a schematic exemplary embodiment. In the figures:

(2) FIG. 1 shows a cross section through a pneumatic vehicle tire,

(3) FIG. 2 shows a cross section through the belt and the belt bandage of the pneumatic vehicle tire of FIG. 1.

DETAILED DESCRIPTION

(4) FIG. 1 shows a cross section through a pneumatic vehicle tire for a passenger car, whereas FIG. 2 shows a cross section through the belt and the belt-covering belt bandage of the pneumatic vehicle tire of FIG. 1. Both figures are described together below. The essential components from which the depicted pneumatic vehicle tire is composed are a largely air-impermeable inner layer 1, a carcass 2 which conventionally reaches from the region of the crown of the pneumatic vehicle tire over the sidewalls 3 into the bead regions 4 and is anchored there by wrapping around high-tensile bead cores 5, a profiled tread 6 located radially above the carcass 2 and a belt 7 arranged between the tread 6 and the carcass 2 and comprising two belt plies 7a, 7b which is radially outwardly covered by a belt bandage 8 which comprises a single belt bandage ply 8a. The belt bandage ply 8a covers the belt along with its belt edges 9. The belt bandage ply 8 has strengthening elements (not shown) which are wound parallel and approximately in the circumferential direction of the pneumatic vehicle tire along its axial width.

(5) The belt bandage ply 8a consists of three sections arranged next to one another: a central section 10 and in each case a lateral section 11, 12 adjoining the central section 10. The belt bandage ply 8a thus has the construction 1-1-1. The two lateral sections 11, 12 are thus arranged without overlapping with the central section 10. The end 13 of the lateral sections that points in each case toward the central section 10 in each case has a distance 14 of 5 mm-15 mm from the closest outer end of the widest belt ply 15, where the distance 14 is measured in the axial direction aR. The strengthening elements in the central section 10 have the construction x1 and the strengthening elements in the two lateral sections 11, 12 have the construction x2, with all the strengthening elements of the belt bandage ply 8a consisting of the same material, of PA6.6. The total fineness of each strengthening element is 940 dtex. The construction of each strengthening element in the lateral sections 11, 12 is 470 dtex x2 and the construction of each strengthening element in the central section 10 is 940 dtex x1. By virtue of the different construction of the strengthening elements in the central section 10 with respect to the lateral section 11, 12, the result is a diameter of the strengthening element in the lateral section 11, 12 of 0.40 mm and in the central section 10 of 0.30 mm. The strengthening elements are arranged in the lateral section 11, 12 in a density of 130 epdm and in the central section 10 with a density of 120 epdm. epdm stands for ends per decimeter and describes the density in which the strengthening elements are arranged in the reinforcing ply.

LIST OF REFERENCE SIGNS

(6) (Part of the Description)

(7) 1 Inner layer 2 Carcass 3 Sidewall 4 Bead region 5 Bead core 6 Tread 7 Belt 7a 1st Belt ply 7b 2nd Belt ply 8 Belt bandage 8a Belt bandage ply 9 Belt edge 10 Central section 11 Lateral section 12 Lateral section 13 End of the lateral section 14 Distance 15 End of the widest belt ply rR Radial direction aR Axial direction