WO2008025598A1

WO2008025598A1 - Method of building a green tyre or a green tyre carcass on a tyre building drum

Info

Publication number: WO2008025598A1
Application number: PCT/EP2007/056922
Authority: WO
Inventors: Udo Frerichs
Original assignee: Continental Aktiengesellschaft
Priority date: 2006-08-29
Filing date: 2007-07-09
Publication date: 2008-03-06
Also published as: DE102006040413A1

Abstract

The invention relates to a method of building a green tyre (1) or a green tyre carcass (2) on a tyre building drum (10), comprising an inner layer (4), reinforcing profiles (9) for sidewalls (8), at least one carcass ply (3) and bead regions (5) with bead cores (6) and bead fillers (7), wherein the tyre building drum is provided with peripheral pockets (11) for receiving the reinforcing profiles (9) and wherein first the inner layer (4), then the reinforcing profiles (9) and the carcass ply (plies) (3) and finally the bead cores (6) and the bead fillers (7) are mounted on the tyre building drum (10). The reinforcing profiles (9) are formed by winding one or more material strips (12) or by winding material strips of different materials.

Description

description

Method for building a green tire or a green tire carcass on a tire building drum

The invention relates to a method for building a green tire or a green tire carcass on a tire building drum, consisting of an inner layer, reinforcing profiles for side walls, at least one carcass ply and bead areas with bead cores and core profiles, wherein the tire building drum is provided with circumferential pockets for receiving the reinforcing profiles and wherein the tire building drum first the inner layer, then the reinforcing profiles and the carcass ply (s) and finally the bead cores and the core profiles are applied.

Self-supporting pneumatic vehicle tires, which are provided in the area of the side walls with reinforcing profiles, which usually have a crescent-shaped

Cross-section, have been known for some time. Thus, for example, the known from DE-A-29 43 654 tire in the region of its side walls each have a one- or multi-part reinforcing profile, which is disposed between the inner layer and the carcass ply and to just below the belt and into the vicinity of the bead core runs. For the production of such tires, it is common that

Tire building drum to be provided with recesses or circumferential pockets, in which the reinforcing profiles are positioned on the inner layer, so that subsequently the carcass ply can be placed at least substantially along a cylindrical surface. From US 5,114,512 it is also known to build the approximately triangular in cross-section core profiles by spirally winding a strip of material from a rubber mixture. From WO 2005/105419 it is known to produce a runnable tire according to a method in which on a primary tire building drum, a tire carcass with at least one pair of

Reinforcement profiles and at least one carcass ply is constructed, then the tire carcass is brought into a toroidal shape and is joined together with a belt bandage with at least one belt layer. The reinforcing profiles, which are constructed from at least one strip of material of a rubber mix by spirally winding on a service drum, are transferred from the service drum to the primary tire building drum before the carcass ply is positioned.

The invention is based on the object to be able to provide variably designed reinforcement profiles in a method of the type mentioned in a simple manner.

The stated object is achieved in that the reinforcing profiles by coils of one or more strips of material (s) or by coils of strips of material made of different materials is or will be.

In the invention, therefore, the reinforcing profiles directly on the

Tire building drum formed by coils of material strips. This allows a very flexible design of the reinforcing profiles, in particular a very variable forming the profile outlets in the direction of the tire shoulder or the later belt and in the direction of (not yet set in this stage) bead cores. The reinforcing profiles can also be constructed of strips of varying width and thickness to ensure the desired cross-sectional shape of the reinforcing profiles.

On the stiffness and carrying capacity of the reinforcing profiles, it has a favorable effect when the or the material strip is wound or forming at least two layers of overlapping turns, wherein at least one of the layers is also formed outside the pockets. A multipart, particularly rigid reinforcing insert can be produced simply by positioning a carcass ply on a layer of the coiled material strip, to which another layer is wound.

The expansion of the reinforcing profiles in the direction of the bead core and / or Reifenzenit can be easily select or set, in which the strip of material from at least one of the layers, in particular with little or no overlap towards the direction later bead and / or direction of the drum center is spooled.

Another measure which can favorably influence the bending stiffness of the reinforcing profiles is that strips of material are used which contain short fibers, which are preferably longitudinally oriented.

In a preferred variant of the method according to the invention, after applying the carcass ply and after setting the bead cores, the core profiles are likewise constructed by spirally winding or winding at least one strip of material from a rubber mixture. In this way, particularly stiff core profiles can be formed, wherein for the core profiles and the material strip, which is used for the structure of Verstärkungspro file, can be used.

Just the coils of the core profiles opens up a number of advantageous ways to build the core profiles in different variants. One of these preferred variants consists in that the core profiles are built up on the carcass ply which has already been turned over on itself by winding the material strip. In another alternative, a two-part core profile can be constructed with the core profile parts separated from one another by the carcass turn-up or a separate bead reinforcing ply.

The invention further relates to a vehicle pneumatic tire produced according to the method of the invention. Further features, advantages and details of the invention will now be described with reference to the schematic drawing illustrating several exemplary embodiments. Show

1 shows a cross section through the one half of a radial tire for passenger cars,

2 is a sectional view of a part of the peripheral portion of a building drum for manufacturing a tire carcass at a stage during tire building;

Fig. 3 is a Fig. 2 corresponding view with a later stage of the tire structure and

FIGS. 4 to 6 show different variants of the formation of core profiles during tire construction.

Fig. 1 shows in cross-section a self-supporting radial tire, which is in a position where a pressure loss in the event of a breakdown in a position to be as sustainable that a drive over a certain time and at reduced speed is possible. The essential components of the tire are a profiled tread 1, a preferably two-ply belt 2, a carcass ply 3, an airtight inner layer 4, bead areas 5 with bead cores 6 and core profiles 7, side walls 8 and one cross-sectionally approximately crescent-shaped reinforcing profile 9 in each side wall 8 The layers of the belt 2 may consist in known manner of reinforcements embedded in a rubber compound, preferably steel cords, which run parallel to one another within each layer, the steel cords in one layer intersecting the steel cords in the other layer and one with the tire circumferential direction Angle, which is between 15 ° and 30 ° include. The reinforcing profiles 9 are arranged between the inner layer 4 and the carcass ply 3 and extend over the shoulder regions of the tire to below the edges of the belt 2 and into the vicinity of the bead cores 6 or also as far as the bead cores 6. The carcass ply 3 is guided in each bead region 5 coming from axially inside around the bead core 6 and extends in the direction of the belt 2 to a certain height and thus forms the high-lift 3a. The core profile 7 is located between the high impact 3a and the carcass ply 3 radially outward on the bead cores 6 sitting.

According to the invention, the reinforcing profiles 9 and optionally also the core profiles 7 have been produced in the manufacture of the tire by winding material strips of rubber mixtures. This will now be explained in more detail with reference to FIGS. 2 to 6. The construction of the tire takes place from still unvulcanized components, wherein the so-called tire carcass is built up on a cylindrical tire building drum in the usual two-stage construction process, which has the inner layer 4, the reinforcing profiles 9, the carcass ply 3, the bead cores 6 and the core profiles 7 as main components.

Fig. 2 and 3 show a section of a peripheral portion of a cylindrically designed tire building drum 10. The tire building drum 10 is provided over its circumference with two circumferential recesses or pockets 11 for the Verstärkungspro file 9, so that the carcass ply 3 after positioning the inner layer 4 and the Forming the reinforcing profiles 9 can be placed at least substantially along a cylinder jacket surface. The circumferential pockets 11 are adapted with respect to their inner contour to the cross-sectional contour of the reinforcing profiles 9 to be formed. First, the rubber compound plate constituting the later inner layer 4 of the tire is placed on the tire building drum 10 and pressed into the pockets 11. Now, the structure of the reinforcing profiles 9 takes place by one or more strips of material 12 are wound or wound around the circumference of the drum. The material strip 12 may consist of a rubber compound that is common and suitable for reinforcing profiles in sidewalls of tires. The strips of material 12 are extruded as a mixture strand, which is deformed into a strip having a width of about 5 mm to 20 mm and a thickness of about 1 mm to 2 mm. In each of the pockets 11, a layer of strips of material 12 is initially spooled overlapping roof tiles. Subsequently, a second layer of the same or another strip of material 12 is preferably oriented in opposite directions to the strip of material 12 in the first layer, likewise wrapped or ragged like a roof tile overlapping the circumference of the drum. In this case, the material strip 12 of one of the layers, preferably the second layer is also wound in the direction of the drum center a piece, here with less or no overlap. The strip of material 12 may also be wound beyond the drum shoulders to adjacent the later position of the bead cores to provide an approximately uniformly rigid circumferential band in the tire with a corresponding overlap zone extending radially from the bead core to about two-thirds of the tire cross-sectional area and then expires to the belt edge area.

The material strip or strips 12 used to form the reinforcing profiles 9 may be fiber-reinforced. In this case, textile short fibers are mixed into the rubber mixture for the material strips 12, which in the strip 12 either no preferred orientation or an orientation in the longitudinal direction of

Material strip 12 have. It may also be provided a layer of a fiber-reinforced material between the two coiled layers.

After the two reinforcing profiles 9 are formed, the carcass ply 3 is put around the tire building drum 10 and the bead cores 6 are set. In this case, the cores 6 can already be set with prepositioned core profiles 7 or, according to a preferred embodiment of the invention, the core profiles 7 can also be formed by winding a material strip 13. In this case, a strip of material 13, starting at the respective bead core 6 in several turns wound on each other with changing overlap, as shown in Fig. 3. The material strip 13 for the

Core profiles 7 are made of a rubber compound that is common for core profiles, wherein the same material as for the reinforcing profiles 9 can be used. By the coils, it is possible, in particular, to form very stiff core profiles 7.

Instead of a carcass ply 3, several, in particular two, carcass plies can be provided. These can be arranged one above the other, thus also be guided together around the core and have staggered arranged staggered each other. In a further, not shown variant of the invention, the one carcass ply after the coils of the one layer of the material strip 12 already positioned, then the second layer of the material strip 12 wound or wound and then positioned the second carcass ply. Subsequently, the bead cores 6, possibly together with core profiles 7, are set and the two carcass plies are guided around the core together, whereby staggered stacks are also formed.

Fig. 4 to 6 show different embodiments of the formation of the core profiles 7 with different arrangements of the carcass ply 3 and the high blow 3 a in the construction of the tire. As shown in FIG. 4 shows the carcass ply 3 can be performed completely around the bead core 6 before the Kernpro fil 7 is placed by winding a Materailstreifens 13 on the drum circumference, so that in the finished tire of the bump 3 a on the inside of the Kernpro fils 7 is.

Fig. 5 shows a variant in which a two-part core profile 7 consisting of parts 7a, 7b is produced by coils of material strip 13, wherein first a short core profile 7a is wound on the bead core 6 of a strip of material 13, then the high blow 3 a of Carcass ply 3 is formed and then at the

Outside the carcass bump 3a, the second core profile part 7b is constructed by winding a strip of material 13. In the embodiment variant shown in FIG. 6, a bead reinforcing layer 14 is positioned between two core profile parts 7'a, 7'b, the carcass turnup 3a is located outside the second core profile part 7'b. The structure of the two core profile parts 7'a, 7'b takes place as already described.

The invention is not limited to the illustrated and described embodiments. Thus, for example, it is possible to use material strips of different rubber mixtures when building up the reinforcing profiles, and also material strips whose cross-sectional areas are varied over their longitudinal extent. The strip of material can or can be wound in more than two layers. The construction of multi-part reinforcing profiles with and without running between reinforcing layers or carcass layers is possible.

Claims

claims

Method for building up a green tire (1) or a green tire carcass (2) on a tire building drum (10), comprising an inner layer (4), reinforcement profiles (9) for side walls (8), at least one carcass ply (3) and bead areas ( 5) with bead cores (6) and core profiles (7), wherein the tire building drum is provided with circumferential pockets (11) for receiving the Verstärkungspro file (9) and wherein on the tire building drum (10) first the inner layer (4), then the reinforcing profiles (9) and the carcass ply (s) (3) and finally the bead cores (6) and the core profiles (7) are applied, characterized in that the reinforcing profiles (9) are formed by winding one or more

Material strip (s) (12) or by coils of strips of material from different materials is or will be formed.

2. The method according to claim 1, characterized in that material strips (12) are used with varying width and / or thickness.

3. The method according to claim 1 or 2, characterized in that the or the material strip (12) is wound at least two layers of overlapping turns forming or are, wherein at least one of the layers outside of the pockets (11) is formed.

4. The method according to claim 3, characterized in that a carcass ply is positioned on a layer of the coiled material strip, wich a further layer is wound.

5. The method according to any one of claims 1 to 4, characterized in that the material strip (12) is wound from at least one of the layers, in particular with little or no overlap, direction later bead and / or direction drum center.

6. The method according to any one of claims 1 to 5, characterized in that the strips of material (12) short fibers, which are preferably longitudinally oriented, contain.

7. The method according to any one of claims 1 to 5, characterized in that after application of the carcass ply (s) (3) and after setting the bead cores (6) the core profiles (7) by spirally winding or winding at least one strip of material (13 ) are constructed from a rubber mixture.

8. The method according to claim 7, characterized in that the core profiles (7) are constructed on a carcass layer (3), which is already folded over on itself, by winding a material strip (13).

9. The method according to claim 7, characterized in that a two parts (7a, 7b) existing core profile is constructed, which parts from each other by the

Carcass turn-up (3 a) or a separate bead reinforcing layer (14) are separated.

10. Pneumatic vehicle tire produced by the method according to one of the plurality of claims 1 to 9.