DE102008004886A1 - Vehicle tires - Google Patents

Abstract

A passenger car pneumatic vehicle tire (1) having a profiled tread (7) and having two tire sidewalls, each having a bead core (2) formed from wire (10) formed in the radially lower portion of each tire sidewall for securing the pneumatic vehicle tire (1) to a rim, with a carcass (3) - in particular a radial design - extending with its main part (8) from a bead core (2) in one tire sidewall radially outward through the tire sidewall through the axial extent of the tire tread to the other tire sidewall and there extends radially inward on an axial boundary side of the second bead core (2) to below the bead core (2) and extends radially outwardly with an envelope part (9) on the other axial boundary side of the bead core (2), characterized in that the wound Bead core (2) in its radial extent a maximum dimension b and in its axial Er stretch has a maximum dimension a with b> a and the turnup part (9) of the carcass (3) extends outwards to a radial position RU, RU being (RK + 3 mm)> = (RK - 3 mm), wherein RK indicates the radial position of the radial maximum extent of the bead core (2) to the outside.

Description

The The invention relates to a pneumatic vehicle tire for passenger cars a profiled tread and with two tire sidewalls, each with one in the radially lower portion of each tire sidewall formed from wire wound bead core for attaching the Pneumatic vehicle tire on a rim, with a carcass - in particular radial Type -, which with its main part of the one bead core in the one tire sidewall radially outward through the Tire sidewall through the axial extent range the tire tread to the other tire sidewall and there radially inward on an axial boundary side of second bead core extends to below the bead core and with an envelope part on the other axial boundary side of the bead core extends radially outward.

modern Pneumatic tires for passenger cars are common this construction on. It usually becomes the bead core with the largest possible axial width and as possible small radial height formed on the one in cross section triangular hard apex made of hard rubber material is. The main part of the carcass lies at the axial (to the equatorial plane pointing of the pneumatic vehicle tire) inside the apex and of the bead core. The envelope part is located on the axial (from the pneumatic vehicle tire groundbreaking) outside of the bead core and the apex and extends radially far into the tire sidewall, that it above the apex in touching contact to the main part of the carcass stands.

The maximum axial extent of the bead core is in such pneumatic vehicle tires at most as large as the radial extent. The size Axial extension of the bead core allows a safe Seat of the pneumatic vehicle tire on the rim. The large radial extent the carcass turnup part in conjunction with its return on the main part of the main part of a carcass, provided at Production and operation of the pneumatic vehicle tire symmetrical Tensile load on the main part of the carcass and the turnup part of the carcass into the bead core. This will be a Slipping out of the carcass under the bead core during the manufacture of the pneumatic vehicle tire and an undesirable high torsion of the bead core, leading to breakage and failure of the bead core could lead to avoided. The training requires a high expenditure on material and costs. Effects caused by splicing the carcass can occur in the area of the tire sidewall, such as constrictive effects due to the splice area occurring stiffening of the carcass especially for this purpose Critical carcass materials can be large Extension region of the envelope part of the carcass reinforced impact.

Occasionally, completely different yet more elaborate design principles have been proposed for mounting a pneumatic vehicle tire on the rim or for securing the carcass in the tire bead. For example, pneumatic vehicle tires have occasionally been proposed in which several parallel bead cores have been used in a tire bead to secure the carcass. Such training is for example from the EP1705035A1 known. The carcass wrapped around a bead core is here additionally clamped between the parallel bead cores. The total axial extension width of the total bead core formed by the individual axially juxtaposed bead cores is also greater here than the radial extent of the overall bead core formed. The large width of the bead core in conjunction with the clamping action of the bead cores arranged side by side ensures the seat on the rim, an undesirable release of the carcass during manufacture and prevents failure of the entire bead core by torsion. This training with multiple bead cores requires a lot of material, manufacturing and costs.

From the JP-09-142112A For example, there is known a vehicular pneumatic tire having a completely deviated bead construction in which two bead-core reinforcements, one of rubber-embedded Kevlar fibers and the other of rubber-embedded nylon material, are radially superimposed to each other for weight reduction. The bead-core-like reinforcement produced in this way is larger in its radial extent than in its axial extent. On the two bead core-like reinforcements, a small apex is additionally constructed, and above this a further, rubber-shaped part with a large radial extent. The turnup portion of the carcass extends radially outward axially along both bead core-like reinforcements and the long triangular rubber body portion to then make contact with the main portion of the carcass above the long triangular rubber body portion. The particular bead construction of superimposed bead-core reinforcements of rubber-embedded Kevlar fibers and embedded nylon material may allow for weight reduction over conventional standard bead designs in pneumatic vehicle tires. The preparation of several bead-core reinforcements is complex and requires additional effort to produce multiple reinforcements of different materials. The formation for additional small apex and large triangular rubber building material as well as the long extended carcass ply impact part require expenditure on material, production and costs. As with conventional standard designs of tire beads, effects that may occur due to splicing of the carcass in the region of the tire sidewall, such as necking effects due to the stiffening of the carcass occurring in the splice region, especially in the case of critical carcass materials in the large extension region of the turnup portion of the carcass reinforced. The wide reaching into the tire sidewall reinforcements from the cover part and between the main part of the carcass and turnup part clamped triangular rubber construction part can adversely affect rolling resistance of the pneumatic vehicle tire. In addition, this training has a high unsprung mass and increased risk of concentricity inaccuracies. In addition, there is an increased risk of flat-spot events.

Of the Invention is based on the object, a pneumatic vehicle tire for Passenger car with a profiled tread and two Tire sidewalls, each with one in the radially lower area formed of each tire sidewall wire wound Bead core for fastening the pneumatic vehicle tire on a rim, with a carcass - in particular radial design -, with their main part of a bead core in the one tire sidewall radially outward through the tire sidewall the axial extent of the tire tread up in the other tire sidewall and there radially inward at an axial Boundary side of the second bead core along until below the Wulstkernes extends and with an envelope part at the other Axial boundary side of the bead core extends radially outward, to create a safer with the reduced cost of materials Seat and a high durability of the bead is made possible.

According to the invention by the formation of a pneumatic vehicle tire for passenger cars with a profiled tread and two tire sidewalls, each with a formed in the radially lower portion of each tire sidewall wire wound bead core for attachment of the pneumatic vehicle tire on a rim, with a carcass - in particular radial design - extending with its main part of a bead core in the one tire sidewall radially outward through the tire sidewall through the axial extent of the tire tread to the other tire side wall and there radially inward on an axial boundary side of the second bead core to below the bead core and with an envelope portion on the other axial boundary side of the bead core extends radially outward, according to the features of claim 1, wherein the wound bead core in its radial extent ma ma x dimension b and in its axial extent has a maximum dimension a with b> a and the turnup of the carcass extends outwards into a radial position R _U , where R _U holds (R _K + 3 mm) ≥ R _U ≥ ( R _K - 3 mm), where R _K indicates the radial position of the radial maximum extent of the bead core to the outside.

Of the in the axial direction narrow and in the radial direction high bead core allows that at the short carcass turnup part introduced only on one side over the main part of the carcass Traction is not sufficient to the umgehlagen around the narrow bead core Pull out the cover part during manufacture and that no large Apply torsional forces to the bead core, the Torsionsbewegungen the bead core could cause, The danger the bead core failure is thus also minimized. The danger undesirable loosening of the seat on the rim is also minimized. In addition to saving carcass material This can also usually be done between the main part of the carcass and Envelope trained at least partially omitted or at least easier together with other components, eg. B. the tire sidewall, be trained and installed. Disadvantages of conventional Tire through for a secure fit and bead durability required high training of the cover part there related disadvantages largely eliminated. So are the stiffening in the area The splicing of the carcasses caused negative effects - such as for example, constricting effects - reduced. About that In addition, the unsprung mass and the rolling resistance of Fahrzeugufufteifens positively influenced. Flat-spot effects can be reduced Concentricity can be improved.

Especially advantageous is the training according to the features of claim 2, wherein for the dimensions of the maximum Extension in the radial direction b and in the axial direction applies: b ≥ 3a. This allows an optimization of the contact surface between carcass and bead core, a significant reduction in torsional stresses the bead core and a better adaptation of the geometry of the bead core to the geometry of the tire bead.

Especially advantageous is the training according to the features of claim 3, wherein the wound bead core is a rectangular one Cross-section with x turns of the wound wire in the axial direction and with y turns of the wound wire in the radial direction has, with y> x.

Especially advantageous is the training according to the features of claim 4, wherein the wire has a circular cross-section and for the number of turns x in the axial direction and y in the radial direction: y> 3x.

Especially advantageous is the training according to the features of claim 5, wherein the number of turns in the axial direction x = 2 and the number of turns in the radial direction x ≥ 6 - in particular x = 8 - is. This can be a simple way very high burst pressure of the tire can be achieved.

Especially advantageous is the training according to the features of claim 6, wherein the pneumatic vehicle tire is free from the riders is trained.

Especially advantageous is the training according to the features of claim 7, wherein the turnup portion is located on the axially outer, from the vehicle pneumatic tire pioneering boundary side radially extends outside.

Especially advantageous is the training according to the features of claim 8, wherein the wound wire of the bead core is a rubberized one Steel wire is.

The invention will be described below with reference to in the 1 to 3 schematically illustrated embodiments explained in more detail. Show here

1 Cross-sectional view of a pneumatic vehicle tire for passenger cars

2 enlarged view of the lower tire sidewall area of 1

3 enlarged view of the tire core of 1 and 2 ,

In 1 is the construction of a pneumatic vehicle tire 1 exemplified. The pneumatic vehicle tire is formed symmetrically to the equatorial plane shown in dashed lines. For simplicity, only the right half is shown.

The pneumatic vehicle tire 1 is a pneumatic vehicle tire for passenger cars, in which for securing the pneumatic vehicle tire 1 formed on a rim right bead area around a bead core 2 a carcass 3 radial design outside an air-impermeable inner layer 14 over the right shoulder area and the tire crown area to the left shoulder area, not shown, and the bead core formed in the left bead area 2 is enough, for which it is laid in a conventional manner. In a conventional manner, in the bead area is not shown in detail rim flange 4 and from the rim flange profile 4 starting at the shoulder area reaching a sidewall rubber material 12 hung up.

Beyond the circumference of the tire, a plurality of belt plies of a belt are arranged outside the carcass plies of the radial design 6 with reinforcements embedded in rubber. In the two shoulder regions shoulder strips of known type, which are not shown in detail, are also applied in a known manner. The conclusion of the tire structure forms in a known manner a profiled tread 7 ,

The carcass 3 consists in a known manner of one or two superimposed layers of embedded in rubber parallel reinforcing elements. The strength members are conventional known strength members for use in carcasses of passenger cars. In the exemplary embodiment, the reinforcing elements are textile reinforcing members, for example cords made of rayon, polyester or similar textile reinforcements known as being suitable for the production of carcasses.

The carcass 3 extends with its main part 8th from the tire crown area axially outward to the tire shoulder and from there radially inward through the sidewall through to the bead core 2 , on the axially inner side facing the tire equatorial side of the bead core 2 along close to the bead core 2 to radially below the bead core 2 , then radially below the bead core 2 axially outward to the axially outer side of the bead core facing away from the pneumatic vehicle tire 2 and in extension in a folded over radially outward envelope part 9 the carcass in close contact with the bead core 2 along its axial outer side radially outward to a radial position R _U , in which it ends.

The bead core 2 is a bead core wound from rubberized steel wire. As in 3 can be seen, is the bead core 2 in the radial direction R spiral wound from an endless bead wire with y in the radial direction one above the other in touching contact wire coils. In the axial direction A, in each case x such wire turns are arranged side by side in contact contact with each other.

For the number of turns x in the axial direction A and y in the radial direction R holds: y> 3x.

In the in 3 illustrated embodiment, two windings (x = 2) and in the radial direction R eight turns (x = 8) are selected in the axial direction A. The bead core has a rectangular cross-section, in which the smaller base side points in the axial direction A and the larger base side in the radial direction R of the pneumatic vehicle tire.

The bead core 2 has a maximum extent a in the axial direction A and a maximum extent b in the radial direction R of the vehicle air mature.

For the dimensions of the maximum extent b in the radial direction R and the maximum extent a in the axial direction A is: b ≥ 3a.

In the in 3 illustrated embodiment is b = 4a.

As in 2 and 3 is shown, the bead core extends 2 with its radially outer circumferential surface to a radial position R _K. For the measure of the maximum radial extent R _{U of} the envelope part 9 the carcass 3 and the radial position R _{K of} the radial maximum extent of the bead core to the outside is: (R _K + 3 mm) ≥ R _U ≥ (R _K - 3 mm).

In 3 an embodiment is shown in which R _{U is} 2 mm smaller than R _K.

In 2 another embodiment is shown in which R _K = R _U.

As in 1 and 2 is shown, the vehicle pneumatic tire is formed free of apex. The rim flange profile 4 extends above the envelope part 9 directly above the bead core 2 in touching contact with the bead core 2 to the main part 8th the carcass 3 ,

As far as necessary in individual cases in alternative - not shown - training on the bead core 2 an apex of known type of hard rubber material attached.

1

Vehicle tires

2

bead

3

carcass

4

Rim profile

5

6

belt

7

profiled tread

8th

Bulk the carcass

9

cover part the carcass

10

core wire

11

12

Sidewall rubber material

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• EP 1705035 A1 [0004]
• - JP 09-142112 A [0005]

Claims (8)

Pneumatic vehicle tire ( 1 ) for passenger cars with a profiled tread ( 7 ) and with two tire sidewalls, each having a wire formed in the radially lower portion of each tire sidewall ( 10 ) wound bead core ( 2 ) for fastening the pneumatic vehicle tire ( 1 ) on a rim, with a carcass ( 3 ) - in particular of a radial design - which, with its main part ( 8th ) from a bead core ( 2 ) in the one tire sidewall radially outward through the tire sidewall through the axial extent of the tire tread into the other tire sidewall and there radially inward on an axial perimeter side of the second bead core ( 2 ) down to below the bead core ( 2 ) and with an envelope part ( 9 ) on the other axial boundary side of the bead core ( 2 ) extends radially outwards, characterized in that the wound bead core ( 2 ) has in its radial extent a maximum dimension b and in its axial extent a maximum dimension a with b> a and the turn-up part ( 9 ) of the carcass ( 3 ) extends outward into a radial position R _U , where R _U holds (R _K + 3 mm) ≥ R _U ≥ (R _K - 3 mm), where R _{K is} the radial position of the radial maximum extent of the bead core (FIG. 2 ) indicates to the outside. Pneumatic vehicle tires according to the features of claim 1, wherein for the dimensions of the maximum Extension in the radial direction b and in the axial direction applies: b ≥ 3a. Pneumatic vehicle tire according to the features of one or more of the preceding claims, wherein the wound bead core ( 2 ) a rectangular cross section with x turns of the wound wire ( 10 ) in the axial direction and with y turns of the wound wire ( 10 ) in the radial direction, with y> x. Pneumatic vehicle tire according to the features of claim 3, wherein the wire ( 10 ) has a circular cross section and applies to the number of turns x in the axial direction and y in the radial direction: y> 3x. Pneumatic vehicle tires according to the features of claim 3 or 4, wherein the number of turns in the axial direction x = 2 and the number of turns in the radial direction x ≥ 6 - in particular x = 8 - is. Pneumatic vehicle tire according to the features of one or more of the preceding claims, wherein the pneumatic vehicle tire ( 1 ) is formed free of core riders. Pneumatic vehicle tire according to the features of one or more of the preceding claims, wherein the turn-up part ( 9 ) on the axial outer, of the pneumatic vehicle tire ( 1 ) Wegweisenden limiting side extends radially outward. Pneumatic vehicle tire according to the features of one or more of the preceding claims, wherein the wound wire ( 10 ) of the bead core ( 2 ) is a rubberized steel wire.