DE19837712A1 - Vehicle wheel - Google Patents

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

The invention relates to a vehicle wheel with - in particular one-piece - rim and tubeless pneumatic tire, - concentric with the radially outer surface of the rim to the rim mounted emergency run support ring with on its radially outer surface trained emergency running surface supporting the tire in the event of damage, whose Outside diameter is larger than the maximum rim diameter.

Such emergency running support body are usually in the between the seats of the Tire with its beads on the rim designed for mounting the tire deep bed attached. Emergency running support rings allow individual retrofitting of Vehicle pneumatic wheels without emergency running suitability for emergency running and a limited one Change in emergency suitability by retrofitting. The assembly of the support body on the Rim is very expensive. Such vehicle wheels must always be taken into account be that the tire with its tensile beads, also mounted on the rim must be, with a bead with its small diameter to the left of the support ring and the other bead is attached to the rim with its right next to the support ring. Thus, a bead with a small diameter over the outer diameter of the Run-flat support ring is moved or the run-flat support ring is moved under the bead become. In order to achieve good driving stability in emergency running, a support effect is in the emergency running Belt edge area particularly important. Even if the emergency running support surface despite this this causes additional assembly problems as far axially outwards that the belt is supported, the force is applied from the belt edge area of the tread the forces acting in the emergency running surface in the axial edge region of the rim and the However, these forces are introduced into the rim axially offset more or less in axial center area of the rim. Although such emergency running support body, which is attached to the drop bed are, reliably support the central area of the tread, the axial offset of the  Force transmission from the belt edge area into the rim due to this Bending moments deteriorate the driving stability - especially the handling properties.

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

According to the invention the task is carried out by training according to the characteristics of the Claim 1 solved. By designing the vehicle wheel with an emergency running support ring, the is mounted on the rim in the axial region of the attachment of a side wall of the tire, The force is introduced into the rim in the axial area of the outermost one Rim edge in the axially outer discharge area important for the driving stability for the Forces from the belt edge area into the emergency support body. The force transmission from Run-flat support body in the rim in the outer rim area also allows one more stable bearing arrangement of the run-flat body on the rim. The axial position for the Force transmission into the rim corresponds to the axial position of the force transmission in the rim in normal operation of the vehicle wheel without emergency running, in which the tread is not on the emergency support surface rests. The force transmission into the rim in the axial area of the Attaching the sidewall of the tire to the rim thus enables reliable Achieve good driving stability in runflat while maintaining the benefits of using a Run-flat support ring regarding the convertibility of a vehicle wheel and regarding Possibility to support the tread axially as far as it makes sense individually. By Forming the emergency run support ring from an elastic material with embedded therein Strengthening elements are in a simple manner in the emergency run, in which the tire with its The tread area is supported on the run-flat support ring, the tire is elastically sprung and damped and thus the driving comfort in emergency running improved. By the reinforcement, the counteracts the centrifugal forces acting on the emergency running support ring moreover, the emergency running support ring also largely in normal operation and in emergency running dimensionally stable. 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 remains stable.  

The advantageous embodiment according to the features of claim 2 enables in simple Way a secure positive, airtight fixation of the pneumatic tire on the rim, whereby in a simple manner both the introduction of force into the rim during normal operation of the Vehicle wheel without emergency running, in which the tread does not rest on the emergency running support surface, as well as in emergency running by applying force to the rim in the same axial position is 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 easy assembly of the bead and thus the Tire on the rim equipped with the runflat support body by moving one Bead over the emergency running surface with a larger bead core diameter than in attached operating state of the bead, so that the formation of the emergency running support surfaces not depending on the diameter of the bead core when fastened and assembly problems caused by this, but primarily optimal Emergency running properties can be trained accordingly. Thus, both in Outside diameter and large in terms of the axial design of the emergency support ring Freedoms with regard to the design for good emergency running properties.

The training according to the features of claim 4 enables full use the radially outer rim surface over its entire axial extent already from the axial outermost edge for optimal installation and fastening of an emergency running body. Arrangement, Design, assembly and fastening can thus be optimally tailored to the individual Requirements of an optimal emergency operation are developed.

By training according to the features of claim 5, according to which the tire sidewall in one in the axial end face of the rim - in particular annularly concentric to the rim - trained chamber is attached, the secure fixation of the Tire sidewall on the rim in the axial edge area for optimal force transmission for good handling properties in normal operation of the vehicle wheel and at the same time that for optimal force transmission for good handling properties in emergency operation desirable storage of the emergency run support ring in the axial area of the attachment Allows sidewall of the tire on the rim surface. Particularly simple, safe and the fastening of the pneumatic vehicle tire is reliable according to the characteristics of Claim 6.  

The training according to the features of claim 7 is preferred Circumferential length - especially elastic - changeable bead core enables assembly of the bead by moving over the emergency running surface with a larger one Bead core diameter than in the attached operating state of the bead and for movement over the rim flange with a smaller bead core diameter than in the fixed one Operating state, so that the formation of the emergency support surfaces is no longer dependent on the diameter of the bead core in the operating state and on the inside Rim flange diameter, but primarily optimal emergency running properties can be trained accordingly. After inserting the bead into the ring 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 filler ring and bead and between bead and radially outer annular chamber wall, radial positive locking and between axially inner annular chamber wall and bead and between the bead and the axially outer Ring chamber wall forming rim flange is produced in each case with an axial positive fit. During vehicle wheel operation there is both normal and emergency operation after loss of compressed air, a complete positive connection axially outwards and inwards and backwards radially outside and inside between one-piece annular chamber of the rim and bead. Both the axial and radial forces acting on the bead are thus directly in the One-piece rim initiated in the fastening area. In the only additional element the filling ring, no significant axial forces are introduced even in emergency operation. In this way, the bead can be safe and reliable even in emergency operation Maintain position in the ring chamber. The bead, which can be changed in its circumferential length can thus both assembled and functional in a simple and reliable manner are disassembled, both the emergency support surfaces optimized for emergency operation and the rim flange with regard to the axial support for the bead and the bead core in its Operating state can be optimized in terms of its properties in the operating state can. The introduction of force into the rim is particularly safe when the bead over it the entire axial extent lies completely radially inward on the filling ring. If the Bead and the filler ring completely fill the annular chamber becomes a special one Reliable positive locking between bead and rim achieved. By training the Pneumatic vehicle tire with an elastically variable circumferential length of the bead is special a change in circumferential length from a first circumferential length is simple and safe further circumferential lengths individually changed according to the respective requirements against the action of restoring forces and back to the first circumferential length achievable using the restoring forces.  

The training according to the features of claim 8 is particularly advantageous because this causes impacts from the road surface when driving in emergency running be damped by deflection of the emergency running support ring, and thus the vehicle wheel too can have favorable comfort properties in emergency running. In addition, the Adjust the emergency running support surface elastically to the supported running surface so that the supportive effect spread over the ground contact area of the tread and not only is punctiform or linear. By embedding reinforcement, the remains Emergency running support ring largely stable in shape despite the centrifugal forces acting while driving and stiff enough to reliably support the tread in emergency running and that of the Derive tread transmitted forces to the rim. The elasticity of the run-flat support ring can also facilitate the installation of the emergency support ring.

By forming a vehicle wheel according to the features of claim 9, the Emergency running support ring largely stable in shape despite the centrifugal forces acting while driving and stiff enough to reliably support the tread in emergency running and that of the Derive tread transmitted forces to the rim. The is particularly advantageous Training according to the features of claim 10. The strength members are good in Embeddable rubber and to achieve dimensional stability, elastic cushioning and Formation of a supported ground contact area and due to its high Tensile strength, bending elasticity and breaking strength are ideally suited.

By forming a vehicle wheel according to the features of claim 11 can the emergency running support ring is particularly reliable, despite the impact of driving Centrifugal forces are largely stable and rigid enough to be trained Reliably support the tread in emergency running and those transferred from the tread Derive forces to the rim. In addition, the emergency running support surface can be special well adjust the supported tread elastically so that the supporting effect over the footprint of the tread is particularly well distributed. The characteristics of the Claim 12 contain further advantageous embodiments of the emergency running support ring Achieving dimensional 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 from its bearing in the axial area of the attachment one side wall of the tire on the rim in the axial direction to the area of Attach the other sidewall of the tire to the rim over 50% to 100% of the  extends axial width of the rim. In this way, an axially very extensive Support area created for good emergency running properties, depending on the individual Requirement for the axial extension of the support weight saving and Effort savings by reducing the axial extension to the essential for good emergency running properties required axial support area are made possible. Particularly useful for achieving the best possible emergency running properties for most Vehicle wheels is a training in which the emergency running support ring moves away from its bearing point in the axial region of the attachment of one side wall of the tire to the rim in axial direction to the area of attachment of the other sidewall of the tire on the Rim extends over 60% to 80% of the axial width of the rim.

The emergency running support body in the center region of the rim is preferred according to the features of claim 14 stored by a second bearing, so that the tread in emergency running is also reliably supported in the middle, and also a power transmission from the Center area of the tread directly into the rim via the second bearing point is made possible. The high frictional connection increases the safety reserves and secures even lateral force build-up. The low bed allows a reduction in the rotating inert masses of the vehicle wheel and a training with low weight due to the reduced bed radius. The one-piece training with the second bearing the rim facilitates reliable, trouble-free introduction of force into the rim.

The features of claim 15 represent a particularly simple with low sluggishness Mass and light weight design of the one-piece with the rim second bearing point. The low inertial mass offers advantages in comfort, cost, Vehicle weight, fuel consumption, wheel acceleration. Training with a Circumferential rib, which extends radially at least as far as the first bearing point, facilitates the assembly and disassembly of the run-flat support ring on the rim easy axial pushing on from the outside or by simple axial pushing down outward.

The training according to the features of claim 16 represents an alternative advantageous Execution of the second depository, which also enables the depository by exchanging individually according to the individually desired requirements change. In this way, the Emergency running properties by replacing the supporting body that serves as the second bearing point be changed against a differently designed support body. It is also possible  Support body to reduce fuel consumption against a lighter one exchange. The additional support body is preferred according to the features of Claim 17 trained. To achieve high rigidity and strength Reliable force transmission into the rim on the one hand and for training with a low carrier Mass and to reduce fuel consumption is the additional support body preferably formed according to the features of claim 18.

By training according to the features of claim 19, the belt is in emergency running to achieve good emergency running properties over an axial extension of the Belt edge supported at least to 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, the run-flat support ring in the axial region of the fastening of the side wall of the Tire is mounted on the rim, which is in the installed operating state on the vehicle Points outside of the vehicle. As a result, the forces of the for Handling properties and essential for the penetration properties Belt side facing the outside of the vehicle is also optimal in emergency running via the emergency running support ring introduced into the rim.

The invention is explained in more detail below with reference to the exemplary embodiments shown in FIGS. 1 to 7. Show here:

Fig. 1 is a cross-sectional view of a vehicle wheel according to the invention with mounted vehicle tire,

Fig. 2 cross-sectional views of embodiments of the filling ring,

Fig. 3 are cross-sectional views of embodiments of the bead portion,

Fig. 4 is a schematic view for explaining the assembly and dismantling,

Fig. 5 cross-sectional view of the vehicle wheel shown in FIG. 1 with the construction of the runflat insert,

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 a third embodiment.

Fig. 1 shows a vehicle wheel with the vehicle pneumatic tire 3 and wheel rim 1 with a ratio of the maximum height H to the 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 is a belt 5 of known construction radially outside the carcass 4 with, for example, two belt plies made of reinforcements embedded in rubber, e.g. B. 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 the belt layers, it is conceivable to have a belt bandage, not shown strength members running essentially to the circumferential direction, for example made of Nylon to wind up.

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 rim 1 is integrally formed on its two axial end faces with an annular chamber 10 arranged concentrically to the rim, with a radially inner 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 . The annular chamber wall 23 delimits the radially inwardly directed rim flange 2 . Axially inwardly between rim flange 2 and a radially inner annular chamber wall 20, an annular passage opening 24 is formed axially from the outside to 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 with a Emergency running surface 14 formed. 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 engages around the radially inwardly extending horns 2 . The curvature of the end face 6 of the horn corresponds to the desired tire contour in the area 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 cylindrical over the entire axial extent of the annular chamber and thus of the bead on its radially outer circumferential surface and is flared axially outside the annular chamber parallel to the radially inner side of the rim flange 25 . In the embodiment of FIG. 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 filling 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 annular chamber is in turn in full contact with the surface of the annular chamber walls or the bead, the annular chamber is completely made 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 this purpose 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 sidewall 9 lifts off in the region of the end face 26 , forming a gap between the end face 26 and the tire sidewall.

Particularly strong impacts on the tires can also occur due to the large Radius of curvature R and the very long one available for the curvature Arc length of the tire sidewall between the tire shoulder and the cylindrical one Rim surface under slight surface stress of the curved Side wall surfaces are dampened safely.  

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 peripheral 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, not shown, is in the emergency running support ring radially on the position of Strength members a wide layer of strength members in one of the above Training opportunities embedded. The strength members of one layer are parallel or - if necessary to increase stiffness - not parallel to that of the first layer arranged. It can be useful to determine the direction of the reinforcement axial direction in the one position opposite to the slope direction of the Form strength members of the other layer. It is the same in others Executions possible on the second layer one or more further layers of Embedding strength members in the support ring.

Fig. 2a shows an enlarged detailed view of the outer edge region of the rim of Fig. 1. In Fig. 2a it can be seen that the inside 25 of the rim flange 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 is flared. 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 displaceably mounted on a cylindrical bearing surface 30 of the rim. 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 of the distance d, the filler ring is thickened radially inwardly to form a shoulder and bears with this on a correspondingly designed 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 self-locking Surface trained. It is also conceivable to make the filler ring from a non-elastic Manufacture plastic or metal. If necessary in individual cases, it is also possible to Filling ring in the assembled state with its shoulder on the corresponding shoulder of the Also fix the rim axially, for example by screwing.

In Figs. 2b and 2c alternative embodiments of the filler ring 12 are shown. 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 and extends at an angle α. The radially inner lateral surface of the filler ring is the same as the correspondingly shaped bearing surface 30 from an axial position at a distance c from the annular chamber side wall axially outwardly at the angle α equally to the wheel axle flared formed. 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.

FIG. 2c shows a filling ring as shown in FIG. 2b, which, however, contains reinforcing elements 17 which 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 fixation 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 Fig. 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 wrapped tightly around the core 8 and the cover 4 ', like in the other exemplary embodiment, the cover 4 ''following the core 8 is in direct contact with the main part of the carcass. The core 8 is tapered to the point of contact between the cover and the main part of the carcass. 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, which has an elastic extensibility in the circumferential direction of the core of 5 to 30%, for standard tire dimensions of 10 to 20%, and an elastic compressibility of 1 to 5%, for standard tire dimensions of 2.5 to 3.5 percent.

The core is extrusion by injection molding or comparatively known Techniques made.  

It is also conceivable to design the bead without a core, and also in this not shown embodiment, the rubber material of the bead is chosen so that the bead has the stated elongation and compression properties in the circumferential direction having.

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.

Reference to the schematic illustrations of FIGS. 4a to 4e, the mounting of the tire on a rim will be described in the following. 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 Fig. 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 lateral surface of the filling ring 12 in the annular 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. The tire 3 is then brought axially from the right, concentrically with the rim, to the rim in the figures. 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 in FIG. 4c, both beads are now compressed in their circumferential length against the elastic restoring forces to such an extent that the outside diameter Dwa of the bead is smaller than the minimum rim flange diameter Dmin. In this state, the beads are inserted axially into the respective annular chamber with play relative to the rim flange. Utilizing the elastic restoring forces, the beads are reset in their circumferential length to such an extent that they again assume the unstretched and non-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 seating 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 by 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. After that the beads are compressed so far that they play with the rim flange from the ring chamber can be pulled. After resetting the circumferential length, a bead becomes so far stretched that it can be pulled axially from the rim with play to the emergency running support surfaces can.

After that - as far as it seems desirable - the emergency running support body can be removed and / or exchanged for another.

It is also conceivable to move the tire for assembly instead of moving it axially first Rotate 90 ° and then stretch and in the stretched state in the radial direction on the Slide the rim to turn it back 90 ° there, so that the two The beads are located axially outside the rim. The further assembly is as above described.

In one exemplary embodiment, the diameter Dmax is, for example, 1.2 times larger than the inner 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 outer diameter Dsa of the bead in the seating position in the annular chamber . A rubber material with an extensibility and with a compressibility is selected as the rubber material of the bead, which allow 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 larger by a factor between 1.05 and 1.3 than the inner ring diameter Dsi of the bead core when the vehicle wheel is fitted. As the rubber material of the bead, a rubber material with an extensibility and with a compressibility is selected for this, which allow such a stretching and compressing 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. Accordingly, the bead, which is primary stretched 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 the special cases an extensibility between 5 and 30% and has a compressibility between 1 and 5%.

It is also conceivable to insert a filler ring after the bead has been introduced into the annular chamber Injection of curable plastic material from the outside through the opening of the Introduce annular chamber.

Fig. 6 shows another embodiment of a vehicle wheel according to the invention, in which the rim 1, an additional annular support body 35 is mounted in the drop base 31 form fit. 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 running support body on it extends radially outside radially. On its radial outside, it is cylindrical. It has a structure with several - e.g. B. with 3 - adjacent in the axial direction, annular hollow chambers 36 , 37 , 38 . 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 fasten the emergency run support ring in a form-fitting manner on the radial outside of the 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.

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

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

Reference list

1

rim

2nd

Rim flange

3rd

Pneumatic vehicle tires

4th

carcass

5

belt

6

Bead area

7

thickening

8th

core

9

Side wall

10th

Ring chamber

11

Run-flat support ring

12th

Filling ring

13

Abrasion-resistant strip

14

Emergency tread

15

Tread

16

lower side wall area

17th

Reinforcement

18th

annular support element

20th

Annular chamber wall

21

Annular chamber wall

22

Annular chamber wall

23

Annular chamber wall

24th

Ring opening

25th

Inside of the rim flange

26

Face of the rim flange

30th

storage area

31

Drop bed

32

Circumferential rib

33

Position of reinforcement

34

Circumferential rib

35

Support body ring

36

Hollow chamber

37

Hollow chamber

38

Hollow chamber

39

Circumferential groove

40

Circumferential nose

41

Flatbed

42

Investment shoulder

43

Fixing nose

Claims (20)

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

• with an emergency running support ring mounted concentrically to the rim on the radially outer circumferential surface of the rim, with an emergency running 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 is fastened in a chamber formed in the axial end face of the rim, in particular in a ring shape concentrically to the rim.

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 outward, axially outward, axially inward and via the filling ring radially inward,
• - 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,

• - The emergency run support ring from its bearing in the axial area of the attachment of one side wall of the tire on the rim in the axial direction to the area of attachment of the other side wall of the tire on the rim 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 characteristics of one or more of the preceding Expectations, wherein the emergency running support surface of the emergency running support body has an axial area in emergency running supports the tread, which extends from one outer belt edge of the tire belt Stretches 50% to 100% of the belt width. 20. Vehicle wheel according to the characteristics of one or more of the preceding Expectations, the run-flat support ring in the axial region of the fastening of the side wall of the Tire is mounted on the rim, which is in the installed operating state on the vehicle Points outside of the vehicle.