WO2014183890A1

WO2014183890A1 - Vehicle pneumatic tire with cavity system in the interior of the tread and method for producing same

Info

Publication number: WO2014183890A1
Application number: PCT/EP2014/053898
Authority: WO
Inventors: Jens Hoffmann; Helge ROTHER; Joao Almeida
Original assignee: Continental Reifen Deutschland Gmbh
Priority date: 2013-05-17
Filing date: 2014-02-28
Publication date: 2014-11-20
Also published as: DE102013105138A1

Abstract

A vehicle pneumatic tire. The invention relates to a vehicle pneumatic tire of a radial design with a profiled tread, wherein a cavity system is present in the interior of the tread, which cavity system becomes visible as negative volumes of further profiling at the outer surface of the profile after a specific amount of abrasion of the tread. The tread is composed of a radially outer tread part (1, 1') and a radially inner tread part (2, 2'), wherein the radially inner tread part (2, 2') is composed in the radial direction of at least two pre-vulcanised rubber layers (3, 4, 3', 4') which enclose between them the cavity system which forms further profiling. The invention also relates to a method for producing such a vehicle pneumatic tire.

Description

VEHICLE AIR TIRES WITH CAVITY SYSTEM INSIDE

OF THE TREAD STRIP AND ITS MANUFACTURING PROCESS

description

The invention relates to a pneumatic vehicle tire in radial design with a profiled tread, wherein in the tread interior, a cavity system is present, which comes to a certain tread wear on the profile outer surface as negative volumes of a further profiling. The invention further relates to a method for producing a pneumatic vehicle tire. From US 8,277,589 B2 is a tread for retreading a

Pneumatic tire known which at its tread forming the outside with a tread profiling and at its opposite inner side with

Profile negatives such as grooves, cuts and the like is provided. With increasing abrasion of the tread the introduced at the back of the tread profile negatives get to the tread outside and provide for a certain

Tread wear provides additional profile negatives and associated profile positives that are important, for example, for tread traction. From the US

6,591,881 B2 it is known to provide in the tread of a pneumatic vehicle tire radially within an outer profiling cavities available that form a second profiling after a certain tread abrasion. The cavities are filled with fillers, which must be removed by means of pull tabs. How to make such a tire remains unclear.

The invention is based on the object to provide a tire of the type mentioned and a method for its production, in which a in the

Furthermore, it should be possible to be able to produce such treads in a simple manner. The object is achieved according to the invention in that the tread of a radially outer tread part and a radially inner tread part

is composed, wherein the radially inner tread part in the radial direction of at least two precured rubber layers is composed, which between them include the hollow chamber system, which forms a further profiling.

With regard to the method, the object is achieved according to the invention in that the tread is formed from a radially inner and a radially outer tread portion, wherein the radially inner tread portion is composed of at least two rubber layers, which are vulcanized, at least in one of the rubber layers one of its sides in the Vorvulkanisation a profiling of grooves, incisions or the like is introduced, and wherein the pre-vulcanized rubber layers are joined together such that the introduced profiling forms the hollow chamber system.

The multilayer structure of the tread of a radially outer tread portion and a radially inner tread portion consisting of at least two pre-vulcanized rubber layers allows a particularly variable embodiment of the cavity system, which emerges after a corresponding abrasion of the tread as a second profiling. By pre-vulcanization, it is possible to introduce into one or more rubber layer (s) a profiling, which is retained in the vulcanization of the finished tire in a vulcanization mold as a hollow chamber system. In a preferred embodiment of the invention, the radially inner and the radially outer tread part have at least substantially equal thicknesses. This measure makes it possible to provide a "hidden" profiling in the radially inner tread part, whose tread depth corresponds at least essentially to the tread depth of the tread in the outer tread part Alternatively, it is possible to use the two

Running strip enteile perform in different thicknesses, which also be provided can that the radially outer run streif enteil has a smaller thickness than the radially inner tread part.

In a further embodiment of the invention, the radially outer running strip enteil is made thicker or thinner at its edge regions than in its central region, wherein the radially inner run enteil enteil with respect to its thickness course is carried out according to the same. By choosing the rubber compounds inside and outside

In this way, running stripes can be specifically influenced on tread properties, such as the stiffness, in the middle area of the tread and in the edge areas of the tread strip. Regarding the middle of the strip, asymmetrical

Designs of the radially outer and the radially inner tread part are also conceivable, in particular, the thicker or thinner design of the tread parts can be provided only on one of the edge regions of the tread. A particularly simple production of the "hidden" profiling is possible in embodiments in which one of the precured rubber layers is a non-profiled cover layer, however, a partial region of the hollow chamber system can also be formed in each of the precured rubber layers or sections of grooves,

Sections and the like, which are each introduced on one side of a rubber layer. In the rubber layers of the inner tread part therefore advantageously any elements of a conventional profiling can be formed.

The inner race strip enteil can be composed according to the invention of more than two pre-vulcanized rubber layers, wherein in the or one of the middle

Rubber layer (s) the parts of the hollow chamber system as a continuous

Recesses are formed. The individual rubber layers can be made of different rubber compounds to so specific

Tire properties with progressive run strip abrasion targeted to influence or optimize. In a possible embodiment of the inventive method, the radially outer tread part of an unvulcanized and therefore not profiled

In the vulcanization of the completed green tire in a vulcanization mold, the profiling in the radially outer

Running strip is stamped enteil. However, according to the invention running treads can also be used in the context of cold rolling renewal, in which case the radially outer run streif enteil is prepared as vorvulkanisierter and provided with a tread profiling component which is assembled with the pre-vulcanized rubber layers of the inner tread part.

The radially inner race strip enteil can be composed in particular of up to six pre-vulcanized rubber layers, especially in tires for trucks. With a larger number of rubber layers, it is possible to profile the pre-vulcanized rubber layers such that they can be joined enteil to a radially inner run, for example, two spaced in the radial direction hollow chamber systems and therefore also two, preferably different,

Contains "hidden" profiles.

Further features, advantages and details of the invention will now be described with reference to the drawing, which schematically illustrates embodiments of the invention. Show

1 shows a cross section through a barrel strip area of a pneumatic vehicle tire, Fig. 2 shows the detail D of FIG. 1 in an enlarged view and

Fig. 3 shows another embodiment of the invention, also with reference to a

Cross-section through the barrel strip area of a pneumatic vehicle tire.

The invention is concerned with a particular embodiment of the tread of a pneumatic vehicle tire, in particular a pneumatic vehicle tire for heavy vehicles, buses or the like in a radial type, as well as a method for producing the

Tread or the pneumatic vehicle tire with such a tread. The invention is not limited to tires for heavy duty vehicles, buses or the like and can also be applied to passenger car pneumatic tires.

Treads of pneumatic vehicle tires are usually profiled. A barrel strip profile is made up of profile positives, these are tread blocks, tread bands and the like, which are those areas of the tread that directly contact the ground as the tire rolls off. A tread pattern also has

Profile negatives, such as grooves, such as circumferential grooves, transverse grooves or diagonal grooves, and cuts on, the latter are according to the prior art narrow, up to 1.5 mm or 2 mm wide grooves, which usually run within profile positive.

Circumferential grooves, transverse grooves and diagonally extending over the tread grooves usually separate the profile positives from each other and have the main purpose for a

Provide water drainage and prevent the occurrence of aquaplaning. In particular, the circumferential grooves in treads, but also transverse grooves or diagonally extending grooves are usually performed on the maximum provided tread depth. Predominantly these grooves therefore influence the circumferential and transverse stiffness of the profile positive, whereby in particular the abrasion behavior, the handling behavior and the

Rolling resistance can be influenced. The profile negatives are pressed in the vulcanization of the pneumatic vehicle tire in a multi-part vulcanization mold over the profile forming molding segments or moldings, which are provided with the corresponding projections, lamellar plates and the like, outside in the tread of the green tire.

A manufactured according to the invention and built tread is composed of a radially outer run streif enteil 1 and a radially inner run streak enteil 2 together. The two tread parts 1 and 2 extend over the entire circumference of the tire and extend beyond the usual width of conventional treads. Together, the two tread parts 1 and 2 give a custom for the particular tire tread and therefore also have a thickness which corresponds to that of the usual tread. In truck tires, the tread thickness in the middle run strip area in the

Order of magnitude of 18 mm to 24 mm. In a preferred embodiment of the invention, the radially outer tread part 1 is produced in the production of the raw tire from an unvulcanized rubber compound and therefore without profiling, for example by extrusion. The radially inner tread part 2 is composed in the embodiment shown in Fig. 1 of two pre-vulcanized rubber layers 3 and 4, as will be explained in more detail. The radially outer tread part 1 receives its profiling in a conventional manner on the mold lands in the vulcanization mold. After the radially outer tread part 1 is thinner than a conventional complete

Tread the profile negatives are performed in the radially outer tread part 1 in a correspondingly smaller depth. The profile negatives may in particular extend to the interface of the radially outer pre-vulcanized rubber layer 3. Of the profile negatives in the radially outer tread part 1 some circumferential grooves 5 are shown in Fig. 1. The profiling in the radially outer tread part 1 may be arbitrary, for example, in addition to circumferential grooves also include transverse grooves or diagonal grooves and the like. In the two pre-vulcanized outer rubber layers 3 and 4, in each case a pre-vulcanization with respect to the design or the "pattern" matching profile has been introduced, such that the two rubber layers 3 and 4, when assembled at their profiled sides, together

Form hollow chamber system, which results in the negative volume in the radially inner tread part 2. As shown in particular Fig.l shows, for example, two partial grooves 6a and 6b in the two rubber layers 3, 4 after a certain run strip abrasion, as soon as the tread profile top facing "bottom" of the part of the groove 6a is reached, a

Circumferential groove. By a corresponding design and arrangement of partial grooves 6a, 6b and the like in the two rubber layers 3 and 4, a "hidden" profile is formed in the tread, which comes to light from a certain tread wear

Profiling in the radially outer tread part 1 match or be performed by this entirely different. Between the bottoms of the formed part grooves 6a, 6b and the like and the outer, non-profiled outer surfaces of the rubber layers 3 and 4 should rubber material of a certain thickness, in particular from 1 mm to 2 mm, remain. The pre-vulcanized rubber layers 3 and 4 can be matching or

have different thicknesses. It is possible in the one thicker rubber layer 3 and 4 to form the predominant part of the hollow chamber system, that is to say partial grooves 6a, 6b and the like, at different depths. In another possible

Embodiment may be one of the precured rubber layers 3 or 4

are made comparatively thick and include all depressions or grooves and the like to form the hollow chamber system or the "hidden" profiling, the second pre-vulcanized rubber layer is executed in a low thickness without profiling and serves only to cover the other pre-vulcanized rubber layer.

Fig. 3 shows a further embodiment of the invention with a radially outer

Run stiff enteil and a radially inner run streif enteil 2 '. The radially outer

Running strip enteil is already made in the unvulcanized state such that it is gradually thicker starting from its edges toward the center, wherein at least one of the rubber layers 3 ', 4' is made such that its thickness, starting from the edges to the center continuously lower is so that in composite tread parts, 2 'a complete tread of the desired thickness or the desired thickness profile is formed. In the radially outer run strip enteil can now in the area of the running strip center profile negatives, such as circumferential grooves 5, are introduced, which have a greater depth than those near the running strip edge areas. In the pre-vulcanized rubber layers 3 'and 4', "hidden" profile negatives 7 may be formed which have a smaller radial extent in the region of the tread center than those in the edge regions like in both

Rubber layers 3 ', 4' form or only in one of the rubber layers 3 ', 4'.

For the retreading of a tire according to the method of Kaltrunderneuerung a tread can be provided, the radially outer run streif enteil 1, 1 ' consists of a pre-vulcanized or vulcanized and already provided with a profiling rubber layer.

Moreover, it is possible to construct the radially inner tread part 2, 2 'from more than two pre-vulcanized rubber layers. The radially inner tread part 2, 2 ', for example, a uniform hollow chamber system in three or four successively positioned pre-vulcanized rubber layers, which correspond with

Wells and the like and recesses are provided. This measure has the advantage that, corresponding to the number of layers, the radially inner tread part 2, 2 'can be composed of different rubber mixtures. Thus, certain tire properties can be optimized during the run Streifenabriebs targeted and it can also be the run strip abrasion itself affected. In tires for heavy vehicles or buses, it is possible the radially inner

Tread part 2, 2 'to build up to six pre-vulcanized rubber layers. In the case of tires for heavy duty vehicles with relatively thick running strips, it is also possible to install in the precured rubber layers one above the other two different "profilings" which come to light one after the other during the abrasion of the tread 3 ', 4' on the belt bandage or a thin, applied to the belt bandage

Intermediate layer of a rubber mixture placed, wherein the pre-vulcanized rubber layers are joined together by means of an adhesive solution. On the outermost vulcanized rubber layer, the radially outer uncured tread part 1, 1 'is applied, the tire then vulcanized in a Reifenvulkanisationsform and thereby introduced the profiling in the radially outer tread part 1, 1'. References list

1, radially outer web part

2, 2 'radially inner tread part

3, 3 'pre-vulcanized outer rubber layer

4, 4 'pre-vulcanized inner rubber layer

5 circumferential groove

6a groove part

6b groove part

7 profile negative

Claims

claims

1. pneumatic vehicle tire in radial design with a profiled tread, wherein in the interior of the strip interior a cavity system is present, which comes to a certain tread wear on the profile outer surface as negative volumes of a further profiling,

characterized,

the tread of a radially outer tread portion (1, 1 ') and a radially inner tread portion (2, 2') is composed, wherein the radially inner race strip enteil (2, 2 ') in the radial direction of at least two precured rubber layers (3 , 4, 3 ', 4'), which between them the

Hollow chamber system, which forms a further profiling include.

2. Pneumatic vehicle tire according to claim 1, characterized in that the radially inner and the radially outer running strip enteil (1, 2, 1 ', 2') at least substantially equal thicknesses.

3. Pneumatic vehicle tire according to claim 1, characterized in that the radially outer tread part (1, 1 ') is thicker or thinner at its edge regions than in its central region, wherein the radially inner run streif enteil (2, 2') with respect to its thickness profile is carried out according to the same.

4. Pneumatic vehicle tire according to one of claims 1 to 3, characterized in that one of the pre-vulcanized rubber layers (3, 4, 3 ', 4') has a non-profiled

Cover layer is.

5. Pneumatic vehicle tire according to one of claims 1 to 4, characterized in that in each pre-vulcanized rubber layer (3, 4, 3 ', 4') respectively portions of the

Hollow chamber system are formed.

6. Pneumatic vehicle tire according to claim 5, characterized in that the subregions of the hollow chamber system are portions or sections of grooves, cuts and the like, which on one of the sides of the respective rubber layer (3, 4, 3 ', 4') are introduced.

7. Pneumatic vehicle tire according to claim 5, characterized in that at least three pre-vulcanized rubber layers are provided, wherein in the or one of the middle rubber layer (s) the subregions of the hollow chamber system as

continuous recesses are formed.

8. A method for producing a running strip of a pneumatic vehicle tire with a

Hollow chamber system inside the barrel strip,

characterized,

that the tread of a radially inner and a radially outer

Running strip enteil (1, 2, 1 ', 2') is composed, wherein the radially inner

Running strip enteil (2, 2 ') from at least two rubber layers (3, 4, 3', 4 ') is formed, which are vulcanized, wherein at least in one of the rubber layers (3, 4, 3', 4 ') on a their sides in the Vorvulkanisation a profiling of grooves,

Incisions or the like is introduced, and wherein the pre-vulcanized rubber layers (3, 4, 3 ', 4') are connected to each other in such a way that the introduced profiling forms the hollow chamber system.

9. The method according to claim 8, characterized in that the radially outer

Running strip enteil (1, 1 ') of an unvulcanized and therefore not profiled Rubber compound is produced and imprinted in the vulcanization of the completed green tire in a vulcanization mold profiling.

10. The method according to claim 8, characterized in that the radially outer

Running strip enteil (1, 1 ') is prepared as pre-vulcanized and provided with the tread profiling component and is joined together with the pre-vulcanized rubber layers.

11. The method according to any one of claims 8 to 10, characterized in that the radially inner tread part (2, 2 ') is composed of up to six pre-vulcanized rubber layers.

12. The method according to claim 11, characterized in that the pre-vulcanized rubber layers are provided with grooves, cuts and the like, that they strip to a radially inner run enteil (2, 2 ') are assembled, which contains two spaced apart in the radial direction hollow chamber systems ,

13. The method according to claim 11, characterized in that at least one of

pre-vulcanized rubber layers is provided with recesses, said rubber layer as an intermediate layer in the radially inner run streak enteil (2, 2 ') is introduced.

14. The method according to any one of claims 8 to 13, characterized in that the radially outer tread part (1, 1 ') is made with a varying thickness over its radial extent, in particular such that its thickness is greatest in the central region and in Direction of the lateral edge regions is continuously lower, wherein the radially inner run streif enteil (2, 2 ') is carried out according to its thickness in accordance with the same.