DE102009026041A1 - Pneumatic vehicle tire has tread, tire sidewall and bead with core, core profile and bead booster layer, where core profile surrounds core rotating symmetric to axial axis of pneumatic vehicle tire - Google Patents

Abstract

The pneumatic vehicle tire has a tread, a tire sidewall and a bead (1) with a core (3), a core profile (2) and a bead booster layer (10).The core profile surrounds the core rotating symmetric to the axial axis of the pneumatic vehicle tire and is warped with a carcass insert (9) around the core. The position ends (8,11) of the carcass insert or the bead booster layer are covered with a material strips (5,6) in form of a ply turn-up.

Description

The The invention relates to a pneumatic vehicle tire with a tire bead with a core and a core profile.

It is known in vehicle tires the tire bead with a tire core, Core profiles and bead enhancers to provide. In conventional bead constructions The tire bead is made of a variety of different Components. Normally, there is at least one carcass ply around the tire core wrapped around with the core profile, with this envelope for anchoring the carcass ply serves. Furthermore, it is known the tire bead with so-called bead reinforcements to provide.

One Disadvantage with the conventional one Construction of tire beads for commercial vehicle tires in that the bead durability only a limited life Has. A certain number of commercial vehicle tires must therefore be exchanged, because the tire bead is irreversible after a certain lifetime damage having.

These damage Among other things, it is caused by the fact that it is at the ends of the Layer envelope of the carcass liner can cause cracking. Such cracking at the ends of the carcass ply may increase cause irreversible damage to the tire bead.

Of the The invention is therefore based on the object, a pneumatic vehicle tire to create, which has a high bead durability.

Is solved the task according to the characterizing Characteristics of claim 1, characterized in that the layer ends of the carcass ply or the bead enhancer layer covered with a strip of material in the form of a layer envelope are, with the strip of material from one in contrast to the surrounding Rubber material layers consists of decompressible material.

One Advantage of the bead reinforcement according to the invention is in particular to see that the vehicle pneumatic tires according to the invention one opposite usual Commercial vehicle tires much higher Having bead durability. The higher one Wulsthaltbarkeit is due to the special bead construction, which greatly inhibited cracking at the ply ends of the carcass ply becomes. It is crucial that the material strip, the layer envelope coated, made of a material that in contrast to classical Rubber is made of a decompressible material or material. As a result, the critical stress state at the end of the layer Carcass insert in the load case of the vehicle tire is present, by a decompression of the encasing material strip considerably be reduced. The use of the decompressible material strip thus leads to an increased Durability of the tire bead.

In an advantageous embodiment of the invention is provided that the strip of material consists of a foamed rubber material. The foamed Rubber material has the advantage that this material to the Layer ends of the carcass insert can be connected well. In addition, this material has no negative properties compared to the surrounding components made of rubber.

In a further advantageous embodiment of the invention is provided that the strip of material consists of a foamed plastic. Foamed plastic also has a decompressible material behavior and can be relatively easy to integrate into the tire bead construction.

In a further advantageous embodiment of the invention is provided that the material strip has a material thickness between about 1 and 3 mm. By doing so leaves the strip of material in a simple way with the layer end of the Connecting carcass ply.

In a further advantageous embodiment of the invention is provided that the strip of material is the ply end of the carcass ply or the bead enhancer layer Sheathed in a U-shape wherein the ply ends on both sides at least in a length range 5 mm covered by the strip of material. Through this advantageous training is optimal stress reduction achieved in the region of the layer end of the carcass insert.

In a further advantageous embodiment of the invention is provided that the strip of material is the ply end of the carcass ply or the bead enhancer layer Sheathed in a U-shape wherein the strip of material has an extension in the form of an extension the ply end of the carcass ply or the bead reinforcing ply having. This will cause the maximum occurring voltage spikes reduced in the area of the layer ends of the carcass insert.

Based an embodiment the invention should be closer explained become. It shows:

1 a tire bead.

The 1 schematically shows the tire bead 1 the pneumatic vehicle tire according to the invention with the core profile 2 , It is in this figure is a radial sectional view of the pneumatic vehicle tire, in which the core profile 2 and the core 3 when Cross-sectional profile are shown. In the figure, the right tire bead 1 represented and the under compressed air standing inside tire 4 lies on the left side of the tire bead 1 , The core profile 2 consists of 2 core profile parts, the lower core profile part and the upper core profile part. These may for example consist of different rubber compounds. The carcass insert 9 is around the tire core 3 from the inside out. On the outside of the carcass ply 9 is a bead amplifier 10 turned around, having the strength carrier, which are aligned in the circumferential direction of the vehicle tire. On the inside of the tire, the air-impermeable inner lining is arranged.

The layer end 8th of the bead amplifier 10 is with the U-shaped strip of material according to the invention 5 jacketed. The material strip 5 consists of a decompressible material, preferably of a foamed rubber material or of a foamed plastic. By the sheathing of the layer end 8th with the material strip 5 the cracking in this area of the tire bead is significantly reduced. The layer end 8th of the bead amplifier 10 is on both sides at least in a length range of 5 mm through the strip of material 5 covered.

The carcass insert 9 is like the bead enhancer 10 around the core 3 struggled. The layer end 11 the carcass ply 9 is also covered with a material strip of a decompressible material. The material strip 6 is also U-shaped and has an extension as an extension in the manner shown. This extension lies in the orientation of the carcass ply 9 , By the sheathing of the layer end 11 with the material strip 6 Cracking in this area of the tire bead is also greatly inhibited. As a result, the bead durability is significantly increased and the tire life increased overall.

1

tire

2

apex

3

core

4

Tire inside

5

U-shaped strip of material

6

U-shaped strip of material with extension

7

Wulstaußenprofil

8th

Location end the carcass ply

9

carcass

10

chippers

11

Location end the bead enhancer layer

12

radial direction

13

Outer tires

Claims (6)

Pneumatic vehicle tire with a tread, a tire sidewall and a tire bead ( 1 ) with a core ( 3 ), a core profile ( 2 ) and at least one bead reinforcing layer ( 10 ), the core profile ( 2 ) the core ( 3 ) encloses rotationally symmetrical to the axial axis of the pneumatic vehicle tire and at least one carcass insert ( 9 ) around the core ( 3 ) with the core profile ( 2 ), characterized in that the layer ends ( 8th . 11 ) of the carcass ply ( 9 ) or the bead reinforcing layer ( 10 ) with a strip of material ( 5 . 6 ) in the form of a layer envelope, wherein the strip of material ( 5 . 6 ) consists of a material that is decompressible in contrast to the surrounding rubber material layers. Pneumatic vehicle tire according to claim 1, characterized in that the strip of material ( 5 . 6 ) consists of a foamed rubber material. Pneumatic vehicle tire according to one of the preceding claims, characterized in that the strip of material ( 5 . 6 ) consists of a foamed plastic. Pneumatic vehicle tire according to one of the preceding claims, characterized in that the strip of material ( 5 . 6 ) has a material thickness between about 1 and 3 mm. Pneumatic vehicle tire according to one of the preceding claims, characterized in that the strip of material ( 5 . 6 ) the layer end ( 8th . 11 ) of the carcass ply ( 9 ) or the bead reinforcing layer ( 10 ) Sheathed in a U-shape, wherein the layer ends ( 8th . 11 ) on both sides at least in a length range of 5 mm through the strip of material ( 5 . 6 ) are covered. Pneumatic vehicle tire according to one of the preceding claims, characterized in that the strip of material ( 5 . 6 ) the layer end ( 8th . 11 ) of the carcass ply ( 9 ) or the bead reinforcing layer ( 10 ) Sheathed in a U-shape, the strip of material ( 5 . 6 ) an extension in the form of an extension of the layer end ( 8th . 11 ) of the carcass ply ( 9 ) or the bead reinforcing layer ( 10 ) having.