EP1104354A1

EP1104354A1 - Vehicle wheel

Info

Publication number: EP1104354A1
Application number: EP99942889A
Authority: EP
Inventors: Frank Walloch; Roland Knopp; Wolfgang Reisdorf
Original assignee: Continental AG
Current assignee: Continental AG
Priority date: 1998-08-20
Filing date: 1999-08-19
Publication date: 2001-06-06
Also published as: DE19837712A1; AU5622999A; JP2002523273A; WO2000010817A1

Abstract

The invention relates to a vehicle wheel comprising an especially single-piece wheel rim (1) and a tubeless tire which has an run-flat support ring (11) mounted concentrically to the wheel rim on the radially external jacket surface of said wheel rim. On the radially external surface of the run-flat support ring a run-flat support surface is embodied whose external diameter is larger than the maximum wheel rim diameter. The run-flat support ring (11) is mounted in the axial area of attachment of a lateral tire wall to the wheel rim and is notably made of an elastic material in which rigidity supports are embedded.

Description

VEHICLE WHEEL

description

Vehicle wheel with - in particular one-piece - rim and tubeless pneumatic tire, - with an emergency support ring mounted concentrically to the rim on the radially outer circumferential surface of the rim with an emergency run support surface formed on its radially outer surface, the outer diameter of which is larger than the maximum rim diameter

The invention relates to a vehicle wheel with - in particular one-piece - rim and tubeless pneumatic tire, - with on the radially outer circumferential surface of the rim concentric to the rim mounted emergency run ring with on its radially outer surface trained the tire in case of damage supporting emergency surface, the outer diameter of which is greater than the maximum rim diameter is.

Such emergency running support bodies are usually fastened in the deep bed formed between the seat surfaces of the tire with its beads on the rim for mounting the tire. Emergency running support rings enable individual retrofitting of vehicle pneumatic wheels without emergency running suitability for emergency running suitability and a limited change of the emergency running suitability by retrofitting. The assembly of the support body on the rim is very complex. With vehicle wheels of this type, it must always be taken into account that the tire with its tension-resistant beads must also be mounted on the rim, one bead with its small diameter being fastened to the rim to the left of the support ring and the other bead having its right next to the support ring becomes. Thus, a bead with a small diameter must be moved over the outer diameter of the emergency run support ring or the emergency run support ring must be moved under the bead. To achieve good driving stability in emergency running, a support effect in the belt edge area is particularly important in emergency running. Even if the emergency running support surface, in spite of this, additional assembly problems extends axially outwards to the extent that the belt is supported, the forces acting on the emergency running support surface from the belt edge region of the tread are introduced in the axial edge region of the rim and the forces are introduced into the rim axially offset more or less axial center area of the rim. Although such emergency running support bodies, which are fastened in the drop-down bed, reliably support the center area of the tread, the axial offset of the force introduction from the belt edge area into the rim can deteriorate the driving stability due to the bending moments caused thereby, in particular the handling properties.

The invention has for its object a vehicle wheel with - in particular one-piece - rim and tubeless pneumatic tire, - with on the radially outer circumferential surface of the rim concentrically mounted to the rim emergency ring with trained on its radially outer surface emergency tire support surface supporting the tire, the outside diameter larger than the maximum rim diameter is to be created in a simple manner with which good driving stability can be reliably achieved in emergency running.

According to the invention the object is achieved by the training according to the features of claim 1. By designing the vehicle wheel with an emergency run support ring, which is mounted in the axial area of the attachment of a side wall of the tire to the rim, the force is introduced into the rim in the axial area of the outermost rim edge in the axially outer introduction area for the forces, which is important for driving stability from the belt edge area into the emergency running support body. The introduction of force from the emergency running support body into the rim in the outer rim edge area also enables a more stable bearing arrangement of the emergency running body on the rim. The axial position for the force transmission into the rim corresponds to the axial position of the force transmission into the rim in normal operation of the vehicle wheel without emergency running, in which the tread does not rest on the emergency running surface. The introduction of force into the rim in the axial region of the fastening of the side wall of the tire on the rim thus enables reliable driving stability to be achieved in emergency running while retaining the advantages of using an emergency running ring with regard to the convertibility of a vehicle wheel and with regard to the possibility of axially extending the tread so far, how to make sense individually. By designing the emergency run support ring from an elastic material with strength members embedded therein, the tire is elastically sprung and damped in an emergency run, in which the tire is supported with its tread area on the emergency run support ring, and thus the driving comfort in emergency run is improved. Due to the strength members, which counteract the centrifugal forces acting on the emergency running support ring, the emergency running support ring also remains largely dimensionally stable even in normal operation and in emergency operation. The emergency run support ring reliably holds its position in the wheel Driving characteristics (straight running, stable cornering) as well as low noise, low vibration remain stable.

The advantageous embodiment according to the features of claim 2 allows a secure positive, air-tight fixation of the pneumatic tire on the rim, thereby easily applying both the force in the fig in normal operation of the vehicle wheel without emergency running, in which the tread is not on the emergency running surface rests, as well as in the emergency run by applying force to the rim in the same axial position is particularly reliably guaranteed. The high frictional connection increases the safety reserves and ensures even lateral force build-up.

The in its circumferential length - in particular elastic - changeable bead core according to the features of claim 3 enables the easy mounting of the bead and thus the tire on the rim equipped with the run-flat support body by moving one bead over the run-flat support surface with a larger bead core diameter than in the attached operating state of the Bead, so that the formation of the emergency running support surfaces can not be designed in accordance with the diameter of the bead core in the fastened operating state and the resulting assembly problems, but primarily optimal emergency running properties. Thus, both in terms of the outside diameter and with regard to the axial configuration of the emergency running support ring, great freedom is given with regard to the structural design for good emergency running properties.

The design according to the features of claim 4 enables the full use of the radially outer rim surface over its entire axial extent even from the axially outermost edge for optimal assembly and fastening of an emergency running body. Arrangement, design, assembly and fastening can thus be individually developed optimally according to the requirements of an optimal emergency operation.

Due to the design according to the features of claim 5, according to which the tire side wall is fastened in a chamber formed in the axial end face of the rim, in particular in a ring concentric to the rim, the secure fixing of the tire side wall to the rim in the axial edge region becomes the optimum in a simple manner Force transmission for good handling properties in normal operation of the vehicle wheel and at the same time the storage of the emergency running support ring in the axial region of the attachment of the, which is desirable for optimal force transmission for good handling properties in emergency operation Allows sidewall of the tire on the rim surface. The attachment of the pneumatic vehicle tire according to the features of claim 6 is particularly simple, safe and reliable

The configuration according to the features of claim 7 is preferred. The bead core, which can be changed in its circumferential length - in particular elastically - enables the bead to be mounted by moving over the emergency run support surface with a larger bead core diameter than in the fastened operating state of the bead and for moving over the rim flange with a smaller one Bead core diameter than in the fastened operating state, so that the formation of the emergency running support surfaces can no longer be designed accordingly, depending on the diameter of the bead core in the operating state and on the inner rim flange diameter, but primarily optimal emergency running properties. After inserting the bead into the annular chamber, the filler ring is inserted radially inside the bead axially into the annular chamber, so that between the radially inner ring chamber wall and filler ring, between the filler ring and bead and between the bead and the radially outer ring chamber wall, radial positive locking and between the axially inner annular chamber wall and bead and between Bead and the rim flange forming the axially outer annular chamber wall is produced in each case with an axial positive fit. During vehicle wheel operation, there is a complete positive connection both axially outwards and inwards and radially outwards and inwards between the one-piece annular chamber of the fig and the bead, both in normal and in emergency operation after loss of compressed air. Both the axial and the radial forces acting on the bead are thus introduced directly into the rim which is integral in the fastening area. No essential axial forces are introduced into the only additional element, the filler ring, even in emergency operation. In this way, the bead can safely and reliably maintain its position in the annular chamber even in emergency operation. The bead, which can be changed in its circumferential length, can thus be both assembled and disassembled in a simple and functionally reliable manner, with both the emergency run support surfaces optimized for the emergency run and the rim flange with regard to the axial support for the bead and the bead core in its operating state with regard to its properties in the operating state can be optimized. The introduction of force into the rim is particularly secure if the bead lies completely on the filler ring over its entire axial extent radially inward. If the bead and the filler ring completely fill the annular chamber, a particularly reliable positive connection between the bead and the rim is achieved. By forming the vehicle tire with an elastically variable circumferential length of the bead is special a circumferential length change from a first circumferential length to individual circumferential lengths changed individually according to the respective requirements can be achieved simply and safely against the effect of restoring forces and back into the first circumferential length by utilizing the restoring forces.

The design according to the features of claim 8 is particularly advantageous, since in this way, when driving in emergency running, impacts acting on the tread from the roadway are dampened by deflection of the emergency running support ring, and thus the vehicle wheel can also have favorable comfort properties in emergency running. In addition, the emergency running support surface can adapt elastically to the supported running surface, so that the supporting effect is distributed over the ground contact surface of the running surface and is not only punctiform or linear. By embedding reinforcements, the emergency run support ring remains largely dimensionally stable and stiff enough despite the centrifugal forces acting while driving to reliably support the running surface in emergency running and to transfer the forces transmitted from the running surface to the rim. The elasticity of the emergency support ring can also facilitate the assembly of the emergency support ring.

By designing a vehicle wheel in accordance with the features of claim 9, the emergency run support ring remains largely dimensionally stable and stiff enough in spite of the centrifugal forces acting when driving to reliably support the tread in the emergency run and to derive the forces transmitted from the tread to the rim. The embodiment according to the features of claim 10 is particularly advantageous. The reinforcement members are embeddable well in rubber and are ideally suited to achieving dimensional stability, elastic damping and the formation of a supported ground contact area and due to their high tensile strength, elasticity in bending and breaking strength.

By designing a vehicle wheel in accordance with the features of claim 11, the emergency run support ring can be designed to be largely dimensionally stable and stiff enough, particularly reliably, in spite of the centrifugal forces acting when driving, in order to reliably support the running surface in emergency running and to transfer the forces transmitted from the running surface to the rim. In addition, the emergency running support surface can adapt particularly well to the supported running surface, so that the supporting effect is particularly well distributed over the ground contact surface of the running surface. The features of claim 12 include further advantageous embodiments of the emergency running support ring Achieve shape stability, elastic damping and the formation of a supported ground contact area.

The vehicle wheel is preferably designed according to the features of claim 13, the emergency running support ring extending from its bearing in the axial region of the fastening of one side wall of the tire on the rim in the axial direction to the region of fastening the other side wall of the tire on the rim by more than 50%. extends to 100% of the axial width of the rim. In this way, an axially very extensive support area is created for good emergency running properties, whereby depending on the individual requirement for the axial extension of the support, weight savings and effort savings are made possible by reducing the axial extension to the essential axial support area required for good emergency running properties. In order to achieve the best possible emergency running properties on most vehicle wheels, it is particularly useful to have a design in which the emergency running support ring extends from its bearing in the axial region of the fastening of one side wall of the tire on the fig in the axial direction to the region of fastening the other side wall of the tire on the rim extends over 60% to 80% of the axial width of the rim

The emergency running support body is preferably mounted in the center area of the rim according to the features of claim 14 by a second bearing point, so that the running surface is reliably supported in the emergency area also in the center area, and also a power transmission from the tread center area in a direct way via the second bearing point into the rim is made possible. The high frictional connection increases the safety reserves and ensures even lateral force build-up. The low bed enables the inertial masses of the vehicle wheel to be rotated to be reduced and the weight to be reduced due to the reduced bed radius. The one-piece design of the second bearing with the rim facilitates reliable, trouble-free introduction of force into the rim.

The features of claim 15 represent a particularly simple embodiment, which can be formed with low inertial masses and light weight, of the second bearing point integral with the rim. The small inertial mass offers advantages in comfort, costs, vehicle weight, fuel consumption, wheel acceleration. The formation with a circumferential rib, which extends radially at least as far as the first bearing point, facilitates the assembly and disassembly of the emergency running support ring on the rim easy to slide on axially from the outside or by simply sliding it axially outwards.

The embodiment according to the features of claim 16 represents an alternative advantageous embodiment of the second bearing point, by means of which it is also possible to change the bearing point individually by exchanging it according to the individually desired requirements. In this way, the emergency running properties can be changed, for example, by replacing the support body serving as the second bearing point with a differently designed support body. It is also possible to replace the support body with a lighter one to reduce fuel consumption. The additional support body is preferably designed in accordance with the features of claim 17. In order to achieve high rigidity and strength for the purpose of reliable force introduction into the rim on the one hand and for formation with a low inertial mass and to reduce fuel consumption, the additional support body is preferably designed according to the features of claim 18

Due to the design according to the features of claim 19, the belt is supported in emergency running to achieve good emergency running properties over an axial extension range from the belt edge to at least the middle of the belt by the emergency running support ring.

Preferred is the formation of a vehicle wheel according to the features of claim 20, wherein the emergency run support ring is mounted in the axial region of the fastening of the side wall of the tire on the rim, which points to the outside of the vehicle in the installed operating state on the vehicle. As a result, the forces from the belt side, which is important for the handling properties and for the puncture properties, facing the outside of the vehicle are also optimally introduced into the rim in the emergency mode via the emergency running support ring

The invention is explained in more detail below with reference to the exemplary embodiments shown in FIGS. 1 to 8. Show here

1 shows a cross-sectional view of a vehicle wheel according to the invention with a mounted vehicle tire, FIG. 2 shows cross-sectional views of embodiments of the filler ring, 3 shows cross-sectional representations of embodiments of the bead area, FIG. 4 shows a schematic representation to explain the assembly and disassembly, FIG. 5 shows a cross-sectional representation of the vehicle wheel according to FIG

Emergency running support ring Fig. 6 cross-sectional view of a vehicle wheel according to Fig.1 in the second

Embodiment Fig.7 Cross-sectional view of a vehicle wheel according to Fig.1 in third

Embodiment Fig. 8 further embodiments of a positive fixation of the emergency running support ring

1 shows a vehicle wheel with pneumatic vehicle tires 3 and rim 1 with a ratio of maximum height H to maximum width B of the pneumatic vehicle tire H / B <0.6. The pneumatic vehicle tire 3 has an inner layer, not shown in detail, which extends over the circumference of the tire and from the left bead region 6 of the pneumatic vehicle tire to the right bead region 6 and over which a carcass 4 of radial construction with, for example, one or two carcass plies is constructed. In the area of the tread there is a belt 5 of known construction radially outside of the carcass 4 with, for example, two belt plies made of reinforcements embedded in rubber, e.g. made of steel cord. The belt extends over the entire circumference of the tire and extends in the axial direction from one tire shoulder area to the other.

The steel cords run at an acute angle of, for example, 10-30 ° to the circumferential direction. Radially outside of the belt layers, it is conceivable to wind up a belt bandage, not shown, with reinforcements essentially extending in the circumferential direction, for example made of nylon.

Radially outside of the belt or belt bandage, a tread 15 made of rubber material extends over the circumference of the tire and extends from shoulder area to shoulder area in a known manner. In the side wall area 9, rubber material is placed on the carcass 4. The sidewall rubber material extends from the shoulder area to the bead area 6.

The one-piece fig 1 is provided on its two axial end faces with an annular chamber 10 arranged concentrically with the rim and with a radially inner one Annular chamber wall 20, an axially inner annular chamber wall 21, a radially outer annular chamber wall 22 and an axially outer annular chamber wall 23 are formed in one piece. The annular chamber wall 23 delimits the radially inwardly directed rim flange 2. Axially inwardly between the rim flange 2 and the radially inner annular chamber wall 20, an annular through opening 24 is formed from the axially outside towards the annular chamber. The rim flange 2 is flared on its radially inward side 25 from axially inward to axially outward and is curved on its end face 26. A one-piece run-flat support ring 11 with an axial width E extends - as can be seen in FIG. 5 - concentrically to the rim within the tire axially from the axial rim edge in the axial direction to at least the center of the rim width F .. The run-flat support ring 11 is radially outside formed with an emergency tread 14. The emergency running surface 14 is profiled with circumferential ribs 32 arranged equidistant from one another in the axial direction. The support ring is supported in the axial direction of the position of the annular chamber 10 on the radially outer side of the rim flange 2, which limits the rim on the vehicle to the outside of the vehicle, in the radial direction. In one embodiment, the emergency running surface extends so far in the axial direction that the belt axially covers the emergency running surface with 50 to 100% of its belt width W, for example 80%.

With its lower side wall regions 16, the pneumatic vehicle tire 3 surrounds the radially inwardly extending horns 2. The curvature of the end face 6 of the horn corresponds to the desired tire contour in the region of the horn.

At the end of the lower side wall region 16, the bead region 6 is formed with a bulge 7 that starts at the inside of the tire. The bead is formed with an elastically stretchable and elastically compressible core 8 embedded in the end of the carcass ply. In the assembled state according to FIG. 1, the bead area 6 fills approximately 1/2 to 2/3 of the annular chamber space with positive locking to the axially inner annular chamber wall 21 and to the radially outer annular chamber wall 22 and to the axially outer annular chamber wall 23. Radially inside the bead, a filler ring 12 is formed in a radially positive manner with respect to the bead area 6 radially outward and radially inward to the radially inner ring chamber wall 20, which extends axially from the ring chamber wall 10 over the entire axial extent of the bead area 6 through the ring opening 24 extends axially outside. The filler ring 12 is over the entire axial extent of the annular chamber and thus of the bead on its radially outer The outer surface is cylindrical and axially expanded outside the annular chamber parallel to the radially inner side of the rim flange 25. In the embodiment of Figure 1, the filler ring 12 extends in the axial direction up to the axial position of the end face 26 of the rim flange. The bead is in the embodiment according to FIG. 1 with positive locking radially outwards, axially inwards and axially outwards to the closed annular chamber walls 22, 23, 21 and through the radial positive locking to the filler ring 12, which in turn is in radial positive locking to the closed annular chamber wall 20 is formed, also to the annular chamber wall 20 in a radial form fit. Since the entire surface of the bead is in positive contact contact with the one-piece annular chamber or the filler ring 12 and the filler ring 12 within the ring chamber is in turn in full contact with the surface of the ring chamber walls or the bead, the annular chamber is completely of bead and Filling ring filled. In addition, the lower side wall region 16 is in complete contact with the radially inner conical rim flange side 25 and with the correspondingly designed conical outer lateral surface of the filler ring 12 also in the axial extension region of the rim flange.

The complete positive locking of the bead to the rim ensures that the tire sits on the rim while driving.

In the area of the end face 26 of the horn 2 of the rim, the tire side wall only bears under prestress.

When a circumferential element of the tire is placed on the road surface, the resulting normal forces F act between the pneumatic vehicle tire and the road surface. When these forces are damped, a resulting force F _A acts on the sidewalls 9 of the tire, which acts essentially in the axial direction and warps the sidewall slightly further. Due to the selected preload between the end face 26 and the tire, the tire still rests against the end face 26 in this normal load case while reducing the preload. When cornering, the preload between the end face 26 and the tire sidewall is increased in the area of the particularly heavily loaded outside of the curve due to the forces introduced. The pneumatic vehicle tire 3 is thus stiffened by the horn on the particularly heavily loaded side. Safe handling is guaranteed. With strong impact effects on the tires, stronger resulting forces F _{A act} on the tire sidewalls. These bulge further axially outwards during damping. The side wall area available for the flexible curvature of the side wall extends from the shoulder area of the tread to the entire curved area of the end face 26. In the event of strong impacts, the tire side wall 9 lifts off in the area of the end face 26, forming a gap between the end face 26 and the tire side wall .

Even particularly strong impacts on the tires can be safely dampened due to the large radius of curvature R and the very long arc length of the tire side wall between the tire shoulder and the cylindrical rim surface, with little surface stress on the curved side wall surfaces.

The runflat support ring 11 extends over the entire circumferential area of the tire. In the event of a sudden loss of internal pressure, the tire is supported with its tread area on the emergency tread 14. Premature destruction and detachment of the tire are avoided.

The emergency run support ring 11 is made of elastic material - for example of rubber or rubber-like plastic - in which a layer 33 of tensile strength members arranged parallel to one another is embedded. The reinforcements are monofilaments or cords made of tensile material, such as is used for the manufacture of tire belts. For example, the reinforcements are monofilaments or cords made of aramid, steel or other suitable metallic or textile material. The strength members extend over the entire circumference of the emergency running support ring at an angle between 0 ° and 30 ° to the circumferential direction.

The layer 33 extends over a width G which extends in the axial direction at least between the axial position of the belt edge and the center of the belt width. The rim 1 is integrally formed in the area of the rim center in its drop center with a circumferential rib 32 which extends radially at least as far as the rim flange supporting the emergency running support body on its radial outside. The emergency running support body 11 is supported with its left side shown in FIG. 5 on the radial, cylindrical outside of the left rim flange 2 and with its right side on the radial outside of the circumferential rib 32 In an embodiment that is not shown, a further layer of reinforcing elements is embedded radially in the emergency running support ring on the position of reinforcing elements in one of the training options mentioned. The strength members of one layer are arranged parallel or - if necessary to increase the rigidity - not parallel to those of the first layer. In this case, it can be expedient to design the gradient direction of the strength members to the axial direction in one position opposite to that of the gradient direction of the strength members in the other layer. In the same way, it is possible in further versions to embed one or more further layers of reinforcing elements in the support ring on the second layer.

FIG. 2a shows an enlarged detailed illustration of the outer edge region of the rim from FIG. 1. In Figure 2a it can be seen that the inside 25 of the rim flange extends conically starting from the annular chamber wall 23, including an angle α to the wheel axis, axially outwards to the curved end face 26 of the rim flange 2. The radially outer circumferential surface of the filler ring 12 is cylindrical starting from the annular chamber wall 21 over the entire axial extent of the annular chamber to the annular chamber wall 23 and in an axial extension from the annular chamber up to an axial distance b from the annular chamber wall 23. Starting from a circular line at a distance b from the annular chamber wall 23, the radially outer circumferential surface of the filler ring 12 is also conically widened axially outward in the axial direction parallel to the inside 25 of the rim flange, including the angle α to the wheel axis. The filler ring, like the rim flange, also extends axially outward over a distance a from the annular chamber wall 23. The filler ring 12 is axially slidably mounted on a cylindrical bearing surface 30 of the fig. In the interior of the annular chamber, the bearing surface 30 forms the radially inner annular chamber wall 20. The bearing surface 30 extends axially outward to a distance d from the annular chamber wall 23. Axially outside the distance d, the filler ring is thickened radially inwardly to form a shoulder and lies with this on a correspondingly trained shoulder of the rim. The distances a, b, d are chosen such that a is greater than d and d is greater than b. The angle α is between 2 and 20 °. In the illustrated embodiment, it is approximately 10 °. In this way, the bead with its thickening 7 and the adjoining lower side wall region 16 between the inner rim flange surface 25 and the filler ring positively guide the rim flange, thereby additionally securing the anchoring of the tire in the rim. The filler ring is made of rubber or an elastic plastic with a self-locking surface. It is also conceivable to produce the filler ring from a non-elastic plastic or metal. To the extent necessary in individual cases, it is also possible to additionally fix the filler ring axially with its shoulder on the corresponding shoulder of the rim, for example by screwing.

2b and 2c show alternative designs of the filling ring 12. The bearing surface 30 extends axially up to a distance c, which is less than or equal to the distance a, from the annular chamber side wall 23 to the outside. The radially outer circumferential surface of the filler ring is also conical from the axial position of the ring chamber side wall 23 at the pitch angle α. The radially inner circumferential surface of the filler ring, like the correspondingly designed bearing surface 30, is also conically widened from an axial position at a distance c from the ring chamber side wall to the outside axially at the angle α to the wheel axis. The distance c is less than a. Due to this conical design, the elastic filler ring is additionally secured in its assembled position by an axial form fit.

A filling ring as shown in FIG. 2b is shown in FIG. 2c, but which contains reinforcing elements 17 that run essentially in the circumferential direction and are embedded in the elastic rubber or plastic material. The strength members give the filler ring additional support on the bearing surface 30. The strength members 17 can be a plurality of tensile strength members arranged next to one another and wound in the circumferential direction. In another embodiment, one or more strength members arranged next to one another are continuously wound helically around the axis of the filler ring from one axial end to the other axial end of the filler ring. The distances between the adjacent windings are equidistant. To the extent that it makes sense to achieve an even more secure fixing of the filling ring on the bearing surface 30, the distances can also be selected differently. The reinforcements are monofilaments or multifilaments made of steel. In another embodiment, the reinforcements are textile monofilaments or multifilaments. It is also conceivable to form the strength members 17 from strips of fabric. The reinforcement of the filler ring 12 by reinforcement in the manner described is also possible in the embodiment of Figure 2a. The bead core 8 is, as shown in FIGS. 1, 2 and 3a, by embedding the core 8 in the carcass 4 by turning the carcass 4 around the core from the inside out or, as shown in the embodiment of FIG. 3b , anchored from the outside in. The carcass 4 is tightly wrapped around the core 8 and the cover 4 ^' , like in the other embodiment, the cover 4 ^"is in direct contact with the main part of the carcass, following the core 8. The core 8 is droplet-shaped to the point of contact between the cover and the main part To form the core 8, an elastic rubber material with a Shore A hardness of 80 to 100, preferably 85 to 90 - in the exemplary embodiment of FIG. 1 with a Shore A hardness of 87 - is selected, the one elastic extensibility in the circumferential direction of the core from 5 to 30%, for standard tire dimensions from 10 to 20%, and an elastic compressibility from 1 to 5%, for standard tire dimensions from 2.5 to 3.5 percent.

The core is produced by extrusion using injection molding or comparatively known techniques.

It is also conceivable to design the bead without a core, the rubber material of the bead also being selected in this exemplary embodiment, not shown, in such a way that the bead has the aforementioned elongation and compression properties in the circumferential direction.

If the abrasion between the rim flange and the lower side wall becomes undesirably large, it is possible, as shown by way of example in FIGS. 1 and 2a, to additionally form an additional strip 13 of abrasion-resistant material, for example abrasion-resistant rubber or plastic, between the rim flange and the bead. The abrasion-resistant strip can extend into the annular chamber and be folded over there around the bead.

The assembly of the tire on a rim is described below using the schematic representations of FIGS. 4a to 4e. The emergency running support surfaces 14 have a maximum outer diameter Dmax, the two rim flanges have a minimum inner diameter Dmin. The tire bead is in Figure 4a in the unstretched and un-compressed state. Its outer diameter Dwa corresponds to the diameter of the radially outer annular chamber wall 22 and thus the outer diameter of the bead Dsa in its seating position in the annular chamber. Its inner diameter Dwi corresponds to the diameter of the radially outer circumferential surface of the filling ring 12 in the ring chamber and thus the inner diameter of the bead Dsi in its seating position in the annular chamber. The core with a thickness d, for example d = 10 mm, in the radial direction in the radial position of half the radial thickness has an average core diameter Dwk through the tire axis, which corresponds to the average core diameter Dsk in the seating position of the bead in the annular chamber. Dmax is greater than Dsa, Dsa is greater than Dsk, Dsk is greater than Dmin, Dmin is greater than Dsi.

For assembly, the emergency run support ring 11 is first pushed and fixed concentrically into its seating position on the rim. Then the tire 3 is brought axially towards the rim from the right in the figures, concentrically with the rim. The left bead is stretched in the circumferential direction against the elastic restoring forces of the bead so that the inside diameter Dwi of the bead is larger than the maximum outside diameter Dmax of the emergency running support surfaces. Thereafter, as shown in FIG. 4b, the tire 3 is moved further concentrically to the rim axially towards the rim, the left bead being pushed axially over the rim and the support body with play to the emergency running support surfaces 14 while maintaining its stretched state. As soon as the left-hand bead has reached a position on the left-hand side axially outside the left-hand rim flange, the bead is set back in its circumferential length using the elastic restoring forces to the extent that it returns to the unstretched and un-compressed state. In this state, Dwi again corresponds to Dsi, Dwa again corresponds to Dsa and Dwk also corresponds again to the mean diameter Dsk of the core in its sitting position in the annular chamber. As shown by the arrow of Fig. 4c, both beads are now compressed in their circumferential length against the elastic restoring forces to such an extent that the outer diameter Dwa of the bead is smaller than the minimum rim flange diameter Dmin. In this state, the beads with play to the rim flange are axially into the respective ring chamber introduced. Utilizing the elastic restoring forces, the beads are reset in their circumferential length to such an extent that they again assume the unstretched and un-compressed state. In this state, Dwi again corresponds to Dsi, Dwa again corresponds to Dsa and Dwk also corresponds again to the mean diameter Dsk of the core in its sitting position in the annular chamber. The beads sit in the ring chamber unstretched and uncompressed. This state is shown in Fig.4d. As shown in FIG. 4e, a filler ring 12 is now inserted axially from the outside axially between the lower side wall region 16 of the tire and the bearing surface 30 to such an extent that the annular chamber is completely filled with the bead and filler ring. The complete positive connection between the one-piece annular chamber and the bead is established. For disassembly, the filling ring is first removed axially outwards. Then the beads are compressed so far that they can be pulled out of the ring chamber with play to the rim flange. After resetting the circumferential length, a bead is stretched so far that it can be pulled axially from the rim with play to the emergency running support surfaces.

Thereafter, if it appears desirable, the emergency running support body can be removed and / or exchanged for another one.

It is also conceivable to mount the tire instead of moving it axially, first rotating it by 90 ° and then stretching it and, in the stretched state, pushing it radially onto the rim in order to turn it back again by 90 ° so that it rotates the two beads are each axially outside the rim. Further assembly is carried out as described above.

In one exemplary embodiment, the diameter Dmax is, for example, 1.2 times larger than the inside diameter Dsi of the bead in the seating position in the annular chamber and the minimum rim flange diameter is smaller by a factor of 1.025 than the outside diameter Dsa of the bead in the seating position in the ring chamber. As the rubber material of the bead, a rubber material with an extensibility and with a compressibility is selected which allows such a stretching and upsetting of the bead in the circumferential direction that the bead can be moved axially with play over the emergency running support surface 14 and into the annular chamber. For example, a known rubber material is used, which allows a 25% circumferential expansion of the bead and a 2.7% circumferential compression.

The emergency running support surfaces can also be designed with a larger or smaller maximum outer diameter Dmax in accordance with the individually adjustable emergency running properties of a tire. The maximum diameter Dmax of the runflat support surfaces for standard tires is optimally larger by a factor of 1.1 to 1.2 than the inner ring diameter Dsi of the bead core when the vehicle wheel is fitted. In special cases, however, it can also be a factor between 1.05 and 1.3 larger than the inner ring diameter Dsi of the bead core when the vehicle wheel is fitted. For this purpose, a rubber material is used as the rubber material of the bead chosen with an extensibility and with a compressibility, which allow such a stretching and compressing of the bead in the circumferential direction that the bead can be moved axially with play over the emergency run support surface 14 and into the annular chamber. Accordingly, the bead, which is unstretched and un-compressed in the assembled state of the vehicle wheel, is designed such that it has an extensibility of between 10 and 20% and a compressibility of 2.5 to 3.5% in the case of standard tires and, in special cases, an extensibility between 5 and 30% and has a compressibility between 1 to 5%.

It is also conceivable to introduce a filler ring by injecting curable plastic material from the outside through the opening of the annular chamber after inserting the bead into the annular chamber.

6 shows a further exemplary embodiment of a vehicle wheel according to the invention, in which an additional annular support body 35 is positively mounted in the drop center 31 of the rim 1. The support body 35 is made of rubber, plastic or sheet metal in lightweight construction or of another suitable material with low weight, with high radial pressure resistance, high fatigue strength and good temperature stability and extends radially at least as far as the rim flange supporting the emergency support body on it extends radially outside radially. On its radial outside, it is cylindrical. It has a structure with several — for example with 3 — annular hollow chambers 36, 37, 38 adjacent in the axial direction. The emergency running support ring 11 is supported with its left side shown in FIG. 6 on the radial outside of the left rim flange 2 and with its right side on the radial outside of the circumferential rib 32.

In the above-mentioned exemplary embodiments, the support ring is frictionally mounted on the rim flange 2 and on the support body 35 or on the peripheral rib 32. The frictional engagement can be generated, for example, by designing the emergency running support body with a press fit to the radial outside of the rim flange and the support body 35 or the peripheral rib 32

As shown in the example of FIG. 6, in another embodiment it is also possible in both cases to have the emergency running support ring in a form-fitting manner on the radial outside of the To attach rim flange 1. For example, as shown in FIG. 6, a circumferential groove 39 is formed in the radial outside of the rim flange 1, into which a circumferential rib 40 correspondingly formed on the emergency running support ring engages in a form-locking manner when the emergency running support ring is slid on axially in its emergency running support position.

8a and 8b show further embodiments of the circumferential rib 40 and the circumferential groove 39 by way of example. In Fig. Δa the circumferential rib 40 and the circumferential groove 39 have a trapezoidal cross section, in Fig. 8b the circumferential rib 40 and the circumferential groove 39 have a triangular cross section. In a further embodiment, not shown, the circumferential rib 40 and circumferential groove 39 have a rounded cross section. For positive engagement by snap-in engagement of the circumferential rib 40 in the corresponding circumferential groove 39 when the emergency running support ring is pushed axially onto the rim, the circumferential groove 39 can be formed on the radial outside of the rim flange 1 or, for example, also on the additional support body 35 or on the circumferential rib 32.

Fig. 7 shows an embodiment of the invention, in which the rim is formed with a flat bed 41, which extends with its radial surface radially at least as far as the rim flange supporting the run-flat support ring extends radially on its radial outside. On its radial outside, it is cylindrical on both sides of an annular one, the outside diameter on the right of the stop shoulder 42 being larger than that on the left of the stop shoulder 42. On the left of the stop shoulder 42, the outside diameter is as large as the outside diameter of the radial surface of the left rim flange, which supports the emergency support body. The radially inner side of the run-flat support ring is designed correspondingly to this outer contour of the rim flange and the flat bed, so that the run-flat support ring 11 can be pushed onto the rim for assembly from the left until the stop shoulder formed on the inside of the run-flat support ring comes into abutment with the corresponding stop 42 the rim comes. The run-flat support ring 11 is supported with its left side shown in FIG. 7 on the radial outside of the left rim flange 2 and then on the radial outside of the flat bed 41 in a frictional manner.

For more secure fixing of the circumferential position, the emergency running support ring can be radially inward on its axial outer side with a part formed only over part of the circumference Directional nose 43 are provided, which engages in a corresponding axial groove in the rim surface when the emergency-running support ring is slid on axially and fixes the support ring in the circumferential direction.

The rims are manufactured in the usual rim manufacturing processes with known rim materials.

Reference list

1 rim

2 rim flange

3 pneumatic vehicle tires

4 carcass

5 belts

6 bead area

7 thickening

8 core

9 side wall

10 ring chamber

11 Run-flat support ring

12 filling ring

13 Abrasion-resistant strips

14 emergency running surface

15 tread

16 lower side wall area

17 reinforcements

18 ring-shaped support element

20 annular chamber wall

21 annular chamber wall

22 annular chamber wall

23 annular chamber wall

24 ring opening

25 inside of the rim flange

26 end face of the rim flange

30 storage space

31 low bed

32 circumferential rib Position of reinforcement

Circumferential rib

Support body ring

Hollow chamber

Circumferential groove

Circumferential nose

Flatbed

Investment shoulder

Fixing nose

Claims

Patent claims

1. vehicle wheel with - in particular one-piece - rim and tubeless pneumatic tire,

with an emergency support ring mounted concentrically to the rim on the radially outer circumferential surface of the rim, with an emergency run support surface formed on its radially outer surface, the outer diameter of which is larger than the maximum rim diameter,

the emergency run support ring is mounted on the rim in the axial region of the attachment of a side wall of the tire,

- The emergency running support ring is formed in particular from an elastic material with strength members embedded therein.

2. Vehicle wheel according to the features of claim 1,

- wherein the pneumatic tire is formed with a bead-shaped thickening with which the tire side wall is attached to the rim and

- The emergency running support ring rests on the rim over the entire axial extent of the bead-shaped thickening.

3. Vehicle wheel according to the features of claim 1 or 2,

- With at least one side wall of the tire to the outside of the tire thickened in its circumferential length - in particular elastic - adjustable bead for attaching the tire to the rim.

4. Vehicle wheel according to the features of claim 1, 2 or 3,

- The radially outer rim surface is completely formed over its entire axial extent in the cavity of the tire enclosed by the tire and rim.

5. Vehicle wheel according to the features of claim 3 or 4,

- The tire side wall in one in the axial end face of the rim - in particular ring-shaped concentric to the rim - trained chamber is attached.

6. Vehicle wheel according to the features of claim 5,

- The tire sidewall in a in the axial end face of the rim concentric to the rim annular chamber is fastened by means of filler material for the positive filling of cavities in the annular chamber or by means of at least one clamping element in the annular chamber

7. vehicle wheel according to the features of claim 5,

with a circumferential length which is thickened on each side wall of the pneumatic tire toward the inside of the pneumatic tire, in particular elastic, for the attachment of the pneumatic tire to the rim,

- With at least in one axial end face of the rim formed annular chamber with a radially inner, a radially outer, an axially towards the center of the rim and an axially towards the outside of the rim outer ring chamber wall, the radially inward, radially outward and axially inward Ring chamber walls formed towards the center of the rim are closed and the ring chamber wall which is formed axially outwards towards the end face of the rim is designed to be closed in the radially outer region as a radially inwardly directed rim flange and is designed to be open in its radially inner region

a filling ring is mounted radially fixed on the radially inner wall of the ring chamber within the ring chamber,

- The side wall of the tire extends axially inward through the opening in the axially outer annular chamber wall and the bead in the annular chamber is radially fixed on the radial outside of the filler ring and in positive contact with the radially outer, axially inner and is designed for the axially outer closed annular chamber wall, so that the bead is positively connected to the integrally formed annular chamber radially outwards, axially outwards, axially inwards and via the filling ring radially inwards,

- The bead, in particular over its entire axial extent, lies completely radially inward on the filling ring, and in particular the bead and the filling ring completely fill the annular chamber.

8. Vehicle wheel according to the features of one or more of the preceding claims, - The emergency running support ring, which is designed to be closed in particular in the circumferential direction, is made of rubber or of rubber-elastic plastic with strength members embedded therein.

9. vehicle wheel according to the features of claim 8,

- The emergency run support ring made of rubber or rubber-elastic plastic with one or more layers of thread-like or band-shaped strength members;

- The strength members are each formed parallel within a layer.

10. Vehicle wheel according to the features of claim 9

- The strength members are tensile monofilaments, multifilament yarns or cords, in particular made of steel, aramid, or textile materials.

11. Vehicle wheel according to the features of claim 9 or 10,

- The strength members are aligned in the assembled state of the vehicle wheel with an angle between 0 and 30 ° to the circumferential direction of the vehicle wheel.

12. Vehicle wheel according to the features of claim 9, 10 or 11,

at least two layers of strength members arranged radially one above the other are formed in the emergency running support ring,

- The strength members of the one layer have a different pitch angle in the circumferential direction of the emergency running support ring than the strength members of the other layer, and

- In particular, the direction of inclination of the reinforcement of the first layer is opposite to the direction of inclination of the reinforcement of the second layer.

13. Vehicle wheel according to the features of claim 4,

-wherein the run-flat support ring extends from its bearing in the axial area of the attachment of one side wall of the tire to the rim in the axial direction to the area of attachment of the other side wall of the tire to the rim by over 50% to 100% - in particular over 60% to 80% - The axial width of the rim extends.

14. Vehicle wheel according to the features of claim 13,

- The rim between the two areas of attachment of the two side wall of the tire is formed on the rim with a drop center, and - A second bearing point for mounting the emergency run support ring, in particular in one piece with the rim, is formed in particular in the drop-center bed.

15. Vehicle wheel according to the features of claim 14,

- In which a peripheral rib is formed in the deep bed, which extends radially in particular at least as far as the first bearing point, and

- The emergency run support ring is placed on the circumferential rib for storage.

16. Vehicle wheel according to the features of claim 14,

- In the deep bed, an additional support body - in particular arranged in a ring, which extends radially in particular at least as far as the first bearing point, and

- The emergency running support ring is placed on the additional support body for storage.

17. Vehicle wheel according to the features of claim 16,

- The additional support body made of rubber, plastic or metal.

18. Vehicle wheel according to the features of claim 16,

- The additional support body is made of a lightweight construction - in particular with a hollow or honeycomb structure

19. Vehicle wheel according to the features of one or more of the preceding claims, wherein the emergency running support surface of the emergency running support body in emergency running supports an axial region of the tread which extends from one outer belt edge of the tire belt over 50% to 100% of the belt width.

20. Vehicle wheel according to the features of one or more of the preceding claims, wherein the emergency run support ring is mounted in the axial region of the fastening of the side wall of the tire on the rim, which points to the outside of the vehicle in the installed operating state on the vehicle.