WO2018145976A1 - Pressure safeguard device for wheels filled with compressed air and method of production - Google Patents

Abstract

A pressure safeguard device (1) for wheels filled with compressed gas comprises at least two annularly closed tubular chambers (2) which are to be arranged in a tyre (4) and extend adjacent to each other along circumferential lines about the tyre axis. The tubular chambers (2) are made from a flexible air-tight flat material and each tubular chamber (2) is formed with a transverse seam (7) and at least one longitudinal seam (8), wherein the at least one longitudinal seam (8) is annularly closed next to the central circumferential line of said tubular chamber (2) and the transverse seam (7) extends about the central circumferential line of said tubular chamber (2). If a tubular chamber (2) is damaged, the other intact tubular chambers (2) expand together over the entire region between the rim (3) and wheel (4) and permit a journey to continue.

Description

 Pressure-securing device for compressed air filled wheels and manufacturing processes

The invention relates to a pressure-securing devices for compressed gas filled wheels according to the preamble of claim 1 and to a method for producing the same according to the preamble of claim 14.

Wheels filled with compressed gas or compressed air are used on land vehicles and aircraft and comprise at least one tire, which is filled with compressed air or pressurized gas, on a rim. There are both tires without and those with hoses. To produce the hoses, sufficient elastic and airtight rubber materials of synthetic or natural rubber, for example, butyl rubber or latex are used. Butyl hoses are slightly less sensitive to heat than natural rubber hoses, but cheaper to manufacture. In order to prevent the hose inner walls and hoses from sticking to the tire or the rim, they may be provided with talcum or other adhesion-reducing agent inside and out.

After penetration of foreign objects, such as nails, screws, stones, glass or even if the tires are damaged due to obstacles, compressed air or compressed gas can escape, which leads to an undesirable pressure reduction in the tire. If the pressure falls quickly and / or below a minimum required value while driving, there is a high risk of accidents and it must be changed at the place where the damage occurs, the tire. This is not only unpleasant at night, in extreme weather and / or on remote stretches of road, but can also be dangerous, especially for women. A tire change can also lead to missed important dates.

An optional spare wheel can not be used in the long term as a replacement for a defective tire. To reduce the damage, Runfiat tires with reinforced flanks were developed, which allow a driver to drive at reduced speed to a service station after a damage event. For minimal damage to tubeless tires, repair sprays have been developed whose sealant can close a small hole. Foaming and curing products have the disadvantage that they connect too tightly with the rim and the tire, so that then possibly the tire and the rim must be replaced. In the known solutions, which allow for a puncture on a puncture for a short time, usually the whole tire must be replaced, which is associated with a high cost of materials. Minor damage to a tubeless tire can be remedied with a patch and stopper or a combined repair kit and a curing treatment so that the tire can be reused. Because the resulting costs are relatively high relative to a new tire, the entire tire is often replaced even with minor damage. For optimum handling it is even necessary to replace the second tire on the same axle.

According to GB 209 944, to reinforce an air hose for wheels, a textile tape is wound spirally around the cross section of the hose. This is very expensive. GB 215 662 describes for pneumatic tires a rubber tube in which radially outer portions of the cross-section along the circumference of the tube are covered with cotton strips to reduce the risk of injury to the tube.

DE 690 04 603 T2 describes a further torus-shaped air hose made of an elastomeric material, which on its outer running surface during the tire comprises a fabric insert serving for reinforcement.

In the case of tubes which are extruded in the round shape and subsequently provided with the reinforcements, it is very costly to arrange the reinforcements on parts of the toroidal tubes. When such a hose is inflated in a tire, a precise position of the reinforcement can not be ensured. There are areas where the hose is not adequately protected from injury. If the hose is injured, it can no longer be driven.

US 2010/0263777 A1 describes a solution with a rim, three tubes and a tread. The hoses include radially inwardly and radially outwardly projecting engagement members which engage corresponding engagement recesses of the rim and the tread. The tread and hoses can be made of different materials, with hoses made of thermoplastic elastomers. From WO 2016/193310 A1 a pressure safety device for wheels is known, in which at least two toroidal tubes are arranged in a tire. If one of the hoses arranged in the tire is injured, the remaining intact tubes should ensure a sufficient residual pressure in the tire for the continuation.

According to US 2010/0263777 A1 and WO 2016/193310 A1, the hoses are produced or extruded with walls closed in cross-section. It has been shown that in the production of such tubes, the wall thickness in the tolerance range of several tenths of a millimeter varies. When inflating the hoses at the same time, the wall thickness differences cause the hoses to expand differently. Now, if a hose is injured, which has taken up an excessive proportion of the total air volume of all hoses, it may be that the volume of intact remained hoses can not provide the necessary for driving on residual pressure.

The object of the invention is now to find a simple solution that is compatible with common rims and tires and tire damage in tire damage that leads to the escape of compressed air or compressed gas, ensures a predetermined minimum imprint inside the tire. In an alternative or advantageous embodiment, the desired normal pressure in the tire should be able to be rebuilt substantially even after a puncture has occurred.

The object is achieved by a pressure-securing device having the features of claim 1, or by a method for producing such a pressure-securing device having the features of claim 14. The dependent claims describe alternative or advantageous embodiments, which solve further tasks. The inventive pressure assurance device for compressed gas filled wheels, comprises at least two in a tire to be arranged while running side by side along circumferential lines around the tire axis annular closed hose chambers, which are connected via a respective feed line to a common feed connection, the tire mounted on a rim is. The hose chambers are made of a flexible, airtight flat material. Each tube chamber is equipped with a transverse seam and at least one longitudinal seam. forms. The at least one longitudinal seam is adjacent to the central circumference of this tube chamber extending annularly closed and connecting transversely to the circumferential line abutting contact areas of the airtight sheet airtight to each other. The transverse seam extends around the central circumferential line of the tube chamber and connects in the direction of the circumferential line abutting contact regions of the airtight flat material airtight to each other.

In the inventive method for producing a pressure-securing device for compressed gas filled wheels, the hose chambers are formed with a transverse seam and at least one longitudinal seam of a flexible, airtight flat material. First, at least a portion of the airtight sheet is cut to a length associated with the length of a central central perimeter of the tube chambers. The two longitudinal ends of each piece of cut airtight sheet are brought into contact with each other to form a closed band. The transverse seam is formed between these ends in such a way that it extends transversely to the circumferential lines of the tube chambers in the tube chambers to be formed and connects airtight to each other in the direction of the circumferential lines abutting contact areas of the airtight flat material.

From at least one closed band, a double-layered area is formed along the circumference of the band. For this purpose, at least one of the two lateral edge regions of a closed band is folded transversely to its circumferential direction or a second closed band is arranged around a first closed band. In the double-layered region, at least one longitudinal seam is formed such that it is annularly closed in addition to the central circumferential line of the resulting tube chamber and airtightly connects contact regions of the airtight flat material adjacent to each other in the circumferential direction in the longitudinal seam.

Flexible, airtight flat material can be produced with little effort so that its thickness has an exact dimension with extremely small deviations. The material properties can be made constant in the two main directions, longitudinal and transverse. Compared to closed hose-shaped extruded hoses, at first sight it seems more complicated when a rectangular piece of flat material becomes a toroidal tube chamber. must be formed. However, this apparent disadvantage does not apply if the requirement for an exact wall thickness of the tube chamber is high.

In the context of the present invention, by overcoming a prejudice, it has thus been recognized that the advantages of the precisely adjustable material properties of a flexible, air-tight flat material in an advantageous embodiment of the hose chambers result overall in a simple solution for a pressure-securing device. The hose chambers of the solution according to the invention, which are arranged in a tire, can be filled together with compressed gas and, because of the precisely set wall properties, they all expand in the desired manner. If one of the tube chambers filled up to the desired pressure is injured, the volume of the tube chambers remaining intact is sufficient to ensure the residual pressure necessary for further travel.

According to an advantageous embodiment, at least two tube chambers, preferably at least four tube chambers, are formed using a continuous piece of the airtight sheet material and are connected to one another via regions of this flat material.

Adapted to the used airtight flat material and to the respective ones

Safety requirements is every longitudinal seam and each transverse seam as a tight connection z. B. as seams sewn with at least one thread and / or formed as an adhesive seam and / or as a sealed seam and / or as a fusion seam. Preferably, the seams are elastically deformable in their longitudinal direction and in particular a sealing element is arranged between the interconnected contact regions, which ensures an airtight connection between the contact regions. For a seam sewn with a thread to be elastically deformable, it is designed as a stretched seam. In the manufacture of the tube chambers, the transverse seam is formed to form a closed band between longitudinal ends of blanks of the airtight sheet material. The longitudinal ends can be brought into contact with each other in an overlapping or blunt manner, wherein the type of seam and the optionally provided sealing element are selected according to the respective type of contact. In the case of an overlapping contact, it may be possible to dispense with a sealing element, or the sealing element is used as a sealing strip inserted between the overlapping contact surfaces. In the case of a blunt or front-side contact, it is preferable to use a sealing element which is tightly connected to both longitudinal ends. For this purpose, for example, two different portions of a sealing strip can each be connected overlapping one end of the airtight Flachmate-.

Because at least one longitudinal seam is also formed over the transverse seam in a later processing step, it is advantageous if no or only the smallest possible change in thickness occurs in the transverse seam. It is advantageous if the contact surfaces connected to a longitudinal seam have the same contact material over the entire length of the longitudinal seam and thus also in the transverse seam with which a sealing element can come into permanent and sealing connection.

In the production of the tube chambers, the at least one longitudinal seam between see abutting contact areas of the double-layered area is formed. The two contact areas are preferably overlapping, so that a dense and resilient seam can be formed with little effort. If two lateral longitudinal edges are joined together, they can be brought into contact with each other in an overlapping or blunt manner. If the two lateral edge regions of a closed band are transposed transversely to their circumferential direction and are brought substantially to mutual contact, then these two edge regions can be applied to a contact region opposite to them and connected thereto with at least one longitudinal seam. There are already two

Hose chambers. If in the central areas of these two hose chambers again a longitudinal seam is formed, there are already four hose chambers.

In a preferred embodiment, the flexible, airtight sheet material is at least a two-layer flat material and comprises a layer with textile flat material and a layer with an airtight film. The textile sheet can be specifically tailored to the desired stability. For this purpose, for example, in areas of the textile sheet material which extend radially outside the tube chambers along the circumference, thread material with high strength, for example made of Keflar, are used. In particular, the textile flat material can also be designed by the chosen production method such that its extensibility in the circumferential direction of the tube chambers is smaller than transversely thereto. This ensures that in a tire after a defect-related pressure reduction in a tube chamber the expand other tube chambers transversely to their circumferential lines, but do not escape through a hole in the tire radially outward.

Textile flat material with a desired extensibility preferably comprises stitches and / or wraps and is, for example, knitwear, in particular

Knitted fabric, optionally knitted fabric, crochet or Bobinet-product trained. When yarn crossing points of the textile sheet material are fixed, so rubbing relative movements of the threads can be avoided during travel movements, which increases the life of the hose chambers. For knitwear, the ductility of the mesh allows for strong local deformation. Tissues are less advantageous because in fabrics, the friction wear is significantly greater than with knitwear and also the local deformability is limited.

If the embodiment comprises an air-tight film, then this is preferably designed as an elastically deformable plastic film, preferably with polyurethane, in particular with a thermoplastic polyurethane elastomer. When selecting the film material, it must be ensured that it remains sufficiently stable at the maximum temperatures that occur in tires. In order to avoid undesired loading of the film, it is at least as elastic as the textile material when combined with a textile material. In a preferred embodiment, in the at least two-ply flat material, the ply of textile flat material is connected to the ply of the airtight film via an adhesive bond.

Different expansion properties in the circumferential direction and transversely thereto as well as specific strength properties can also be ensured with a flat material in the form of a film with a corresponding fiber insert. If the foils are sufficiently stable, it may be possible to dispense with a layer of textile material. If the textile material is hermetically sealed with a coating, it may be possible to dispense with a film. The structure of the flexible airtight flat material can be adapted to the particular needs, which are different for wheels of light road vehicles than for example for aircraft wheels or wheels of heavy off-road vehicles.

The airtight flat material of each tube chamber is elastically deformable at least in the direction about its central circumferential line, in particular at least to 1.5 times the unstressed resting length. Preferably, this flat material is also in the Direction of the central circumferential line elastically deformable, wherein preferably the elastic extensibility around the central circumferential line is greater than along the central circumferential line. At each tube chamber, a chamber opening is formed, to which the feed line is airtight connectable. In a preferred embodiment, an eyelet is inserted into the chamber opening, which has an alignment feature, in particular with respect to the direction of the circumferential lines, so that a connection part can be inserted into the eyelet in a desired orientation. As a possible alignment feature, an oval design of the eyelet and the adapted thereto portion of the connecting part can be used.

The solution according to the invention can be used on standard rims and in standard tires, wherein a common feed connection is arranged on the opening for the opening of a valve formed on the rim. The at least two circularly closed tube chambers used in a tire can all be connected to one another via the airtight flat material. Optionally, however, two or more not firmly interconnected sets are compiled with at least one tube chamber. Such sets can be releasably connected via a connecting device to a stack of hose chambers. The replacement of a set with a defective tube chamber is made possible by means of connectable and detachable connections to the feed lines between the tube chambers and the common feed connection. The undamaged sets with hose chambers and the tire can still be used.

In a puncture, only a single tube chamber is damaged in the vast majority of cases and thus the tire loses only the originally provided by this tube chamber pressure component. If at least four hose chambers are arranged in the tire, the running behavior of the tire is only slightly changed in the loss of the pressure portion of a hose chamber and the risk of accidents is very small even with a puncture. The element that caused the damage remains in the area of the damaged tubing chamber or falls off the tire. The other tube chambers usually remain undamaged even when the element is stuck in the tire. According to a preferred embodiment, in a puncture with a defective tube chamber, the other tube chambers, possibly after the removal of the element that has caused the damage, are inflated so far that the tire is rebuilt the desired tire pressure.

When using the pressure-securing device, further advantages result from the fact that the demands on the tire are reduced. Because the compressed air is contained in tight hose chambers, an air-tight inner layer can be dispensed with when ripening. The tube chambers adjoining each other in the direction of the tire axis along their circumference with side regions each comprise, in the pressurized state, radially extending tube chamber walls which assume a supporting function between the rim and the tread of the tire. As a result, the requirements for steel cord belt layers and / or the textile cord deposits are reduced in the tire without having to accept disadvantages in terms of dimensional stability and / or rolling resistance in purchasing. The bead reinforcement and / or the core profile formed for the driving stability and the steering behavior on the tire can also be reduced, because an adjoining tube chamber can at least partially take over its function. In order to achieve the further advantages in the largest possible extent, the hose chambers are optionally equipped according to their position in the tire with increased wall thickness and / or with additional elements.

According to a preferred embodiment, the pressure-securing device comprises a tire and the circumferential lengths of the tube chambers are adapted to these tires such that, after placing in the tire and inflating to a first degree of filling, with their smallest circumferential lines facing the tire axis Radius around the tire axis, which is greater by a predetermined amount than the inner radius of the tire edge lines with the smallest circumference of the tire. The free space provided in the tire with the hose chambers at the smallest circumference of the tire enables trouble-free mounting on the rim.

First, the tube chambers are connected via the feed lines to the common feed connection, which is preferably arranged at a passage opening of the rim. Subsequently, the tube chambers are inflated via the common feed connection to a first degree of filling, so that the hose chambers are held in the tire and provide the desired clearance. In this state, the mounting of the tire on the rim without problems is feasible because the space for the radially outwardly projecting rim is sufficiently large.

When the tire with the hose chambers is mounted on the rim, the hose chambers can be filled with compressed gas until the desired tire pressure is built up in the tire. When the tire is close to the rim, the air between the tube chambers and the rim can not escape. Therefore, it is advantageous if at least the passage opening through the rim or the common feed connection used still provides a vent connection from the interior between the rim and the tire to the environment. It goes without saying that additional vents can be formed by the rim, so that the tube chambers are inflated so that substantially no residual air between the tube chambers and the rim or the tire remains.

In order for the tube chambers to optimally abut against one another and against the inside of the tire and the rim during inflation, optionally at least parts of the outer surfaces of the tube chambers comprise an insert or a coating.

In the fully inflated state, adjacent ones extend

Tubing chamber walls of adjacent tube chambers substantially radially from the rim to the side facing away from the tire tread inside of the tire. Due to the pressure in the tube chambers and possibly also due to the longitudinal seams, the radially extending tube chamber walls are stiffened and could be heavily mechanically stressed by the compression and decompression occurring periodically during rolling of the wheels.

According to a preferred embodiment, annular damping elements are arranged between the adjoining tube chamber walls, preferably in the vicinity of the inner surface of the tire. In such a damping element, both tube chamber walls deviate somewhat from the radial orientation. The radially aligned sections press in compression phases on the damping element, which can absorb the compression. Is to the damping element formed elastically, optionally made of sponge rubber or of a sufficiently elastic or damping plastic.

The compression and decompression of the circumferential circumferential sections of the tire and the hose chambers arranged therein occurring during the rolling of the wheels due to the load in the region of the support surface periodically leads to a deformation of the cross section in each peripheral section. In the further course of the rolling process, the cross section normalizes again. In this case, at least the radially outer regions of the hose chambers are drummed. During rolling, frictional movements can occur between the adjoining regions of the tube chambers and possibly also towards the inside of the tire. In order to prevent or at least minimize such frictional movements, in a particularly advantageous embodiment at least one partial surface of the outer surface of the tube chambers is provided with adhesive material.

Preferably, the double-layered region formed from at least one closed band in the production of the tube chambers comprises adhesive material after the formation of the at least one longitudinal seam on the radially outwardly directed surface. This material can be applied after the formation of the at least one circumferential longitudinal seam. Optionally, however, flat material is already used in the compilation of the double-layered area, which is provided with adhesive material at least in some areas. If a second closed band is arranged around a first closed band, flat material can be used for the second closed band, which is provided with an adhesive coating on the outwardly directed surface in the band form.

The provided with adhesive material faces of the outer surfaces of the

Hose chambers are arranged so that adjoining outer surfaces of hose chambers adhere to each other in the above described for rolling rolling process, or do not move relative to each other. Preferably, the tube chambers also adhere to the inner surface of the tire, so that no frictional movements occur between the tire and the tube chambers. The adhesion between the hose chambers and optionally between the hose chambers and the tire is also designed so that the hose chambers can be solved by the tire and that in a defective tube chamber, the subsequent tube chambers can expand so against the defective tube chamber that not damaged tube chambers fill the tire interior, while ensuring the minimum total pressure required, so that the tire ensures the minimum necessary running properties. The adhesive material is therefore chosen so that the adhesion forces per area are in a range between a minimum necessary and a maximum allowable surface adhesion force. The surface adhesion forces achieve a mechanical cohesion of the surfaces or elements involved.

Because heat is also generated by the walking, the surface adhesion force should also remain for a predetermined temperature range between the minimum necessary and the maximum permissible surface adhesion force. The flexible, air-tight flat material is preferably selected so that the internal friction arising during the rolling and its excitation frequency is minimal. Then the temperature of the tube chambers is also within a narrower temperature range.

In addition, the mechanical cohesion between the tire and the hose chambers achieved by the adhesion forces ensures that when accelerating and braking the wheels with the tires and the hose chambers, the forces and torques other than the tires and the hose chambers do not cause relative circumferential rotation of these elements to lead . For extreme accelerations and braking, it may be advantageous if adhesive forces are also provided between the rim and the areas of the hose chambers adjacent thereto. For this purpose, the hose chambers can be provided with adhesive material even in partial areas which face the rim.

With a targeted dimensioning and arrangement of the hose chambers along the wheel axle, the effort expended in the tire for a desired continuous contour of the tire tread can be reduced. In particular, tires with simpler steel and / or textile inserts and / or modified tread geometry can be used without deterioration of the contour. In a further preferred embodiment, the common feed connection is arranged on a passage opening of the rim. On the tire facing radially near the axis of the rim, the common feed connection comprises a feed opening and on the side facing away radially from the wheel axle for each feed line a closure region, these closure regions preferably biased all connections from the feed opening into the feed lines individually shut. This ensures that in the case of a leaking tube chamber, the other tube chambers do not discharge pressurized gas through the defective tube chamber to the environment via their feed lines.

According to a preferred embodiment of the common feed connection, its feed opening is provided, analogously to a standard valve, with a check valve which can be opened by means of the insertion of a central pin. Now, if the movement of this pin and the closure areas moves away from the connections to the supply lines, so it can be discharged from the hose chambers pressure gas, or filled at a higher pressure on the side of the feed opening compressed gas into the tube chambers. It goes without saying that possibly only the prestressed closure areas are provided without additional standard valve.

In a preferred embodiment, the distances of the closure regions increase or decrease along the essentially radially extending longitudinal axis of the feed connection. The lines of intersection of the closure regions with normal planes to the longitudinal axis can be formed straight or curved. Preferably, the closure regions are formed by partial surfaces of a displaceable valve body, wherein the valve body is arranged in a housing of corresponding design with openings to the feed lines. The closing bias between the housing and valve body is preferably achieved by at least one spring element.

The openings and the adjoining supply lines are tightly connected via detachable connections. In particular, annular grooves are formed at the openings, and the end portions of the feeders include respective annular beads for engaging with the annular grooves. Because the internal cross-sectional area of the feeder lines can be made small, the forces to be absorbed by engaging links are small. The wall thickness or dimensional stability of the feed lines is preferably formed so high that they remain open when they are loaded from the outside with common tire pressures. This load capacity is required for emptying the hose chambers, because yes, the feed lines inside the tire of the

Hose chambers run to the common feed connection and thus are loaded on the outside with the tire pressure.

Thus, when refilling compressed gas into a plurality of feed lines connected to a common feed connection, one of which leads to a defective one

Hose chambers leads, the supplied compressed gas can not escape through the defective hose chambers into the environment, in a further preferred embodiment, a differential pressure locking device is used for each hose chambers. This makes the connection through the common feed connection to the defective hose chambers by means of the pressure of at least one intact hose chamber closable.

In a particularly advantageous embodiment, the differential pressure closing device comprises a closure device for each connection of a hose to its feed line, which closes the connection from the feed opening into the defective hose chamber at a defective hose chamber due to an overpressure in at least one intact hose chamber. For this purpose, the closure devices are preferably arranged on chamber openings of the hose chambers and in particular each formed with a tightly arranged on the chamber opening connecting part.

A preferred connection part comprises a connection from the supply line to a free end open loop in the tube chamber and is aligned in the chamber opening such that the radius of curvature of the line loop is high due to overpressure in at least one intact tube chamber in the event of a defective and therefore flattened tube chamber is squeezed. In the crimped state of the line loop, the connection from the supply line into the tube chamber is interrupted and when refilling compressed gas through the common feed connection, the supplied compressed gas can not escape through the tube chamber with the leak, but fills the at least one other tube chamber. If the wheels of a vehicle are equipped with pressure-securing devices according to the invention, it is sufficient to carry at least one compressed-gas cylinder after a pressure drop in a tire in the majority of cases in order to ensure a substantially unrestricted movement. A compressed gas bottle allows a quick and easy refilling of the undamaged

Hose chambers without special expertise. When refilling quickly, the refilling person is only a short time outside the vehicle busy, so that the risk of harassment or a weather-related burden is very small. It can be dispensed with the entrainment of a spare wheel and tools for replacing a wheel. The space requirement for the small compressed gas cylinder is much smaller than the space required for a spare wheel and tools. In addition to the vacant space, the vehicle's basic weight and thus the energy consumption for driving is also reduced. For refilling a defective tire, pressurized gas in the form of nitrogen is preferably used. A pressure cylinder with nitrogen is not associated with an increased risk of fire or explosion even in the event of accidental damage. The pressure drop in a tire with the pressure relief device is limited and yet easy to determine. If a hose is defective in a wheel of an axle, there is a detectable speed or circumferential difference between the two wheels of this axle via the ABS system or via the indirect tire pressure monitoring system. If the vehicle is driving straight ahead, due to the difference in the rotational speed of these two wheels, a damaged tire can be identified with sufficient certainty. Complex direct measurements of wheel pressures and / or distances between axle areas and the floor can be dispensed with. The described simple possibility of detecting a pressure drop over values of the ABS system or of the indirect tire pressure monitoring system is an advantage of the pressure-securing device compared with the use of "run-flat" tires, in which the outer diameter of the tire also decreases due to the pressure drop relatively rigid side surfaces does not decrease enough, so that for the detection of a tire defect pressure measurements are necessary. Run flat tires gen also significantly higher amounts of material and a complicated structure and can only ensure a limited ability to continue.

The drawings illustrate the invention with reference to embodiments, to which it is not limited. It shows

1 is a perspective view of a cut-open pressure relief

Device with four fully inflated tube chambers, as well as a tire and a rim,

FIG. 2 is a view of the pressure securing device shown in FIG. 1; FIG.

 Fig. FIG. 3 shows a perspective view of a closed band formed from an airtight flat material, which is shown cut open at a corner, FIG.

 4 is a side view of the closed band according to FIG. 3,

5 is a plan view of the closed belt according to FIG. 3,

 6 is a perspective view of a formed from an airtight sheet closed tape with reinforced areas,

7 is a perspective and cutaway view of a formed from a closed band double-layered area,

FIG. 8 is a view of the double-layered portion shown in FIG. 7. FIG.

 9 is a perspective and cutaway view of a pressure relief device with four hose chambers,

10 is a view of the four hose chambers shown in FIG. 9,

1 1 is a perspective view of a cut-pressure-securing device with four only partially inflated tube chambers, and a tire and a rim,

12 is a view of the pressure securing device shown in Fig. 1 1,

13a and 13b are longitudinal sections through a feed connection in the closed or open valve position,

13c shows an end view of the feed connection according to FIG. 13a and 13b, and

 Fig. 14 is a perspective view of a differential pressure locking device.

1 and 2 and 1 and 12 show a wheel with a pressure-securing device 1 with four hose chambers 2. In the illustrated embodiment, the hose chambers 2 are in the cavity formed by a rim 3 and a tire 4. The Hose chambers 2 extend adjacent to each other along circumferential lines around the tire axis and are thereby closed in an annular manner. Each tube chamber 2 is connected via a respective feed line 5 (FIGS. 11, 12) to a common feed connection 6. The tire 4 can be mounted together with the hose chambers 2 on the rim 2. Fig. 1 and 2 show the hose chambers 2 in the state filled with compressed gas, in which the desired tire pressure in the space between the rim 3 and the tire 4 is constructed. In Fig. 1 1 and 12, the hose chambers 2 are only slightly filled with compressed gas. The hose chambers 2 are formed from a flexible, airtight flat material. Each tube chamber 2 is formed with a transverse seam 7 and at least one longitudinal seam 8. The at least one longitudinal seam 8 is closed annularly next to the central circumferential line of the respective tube chamber 2 and connects airtight to each other abutting contact areas of the airtight sheet material transversely to the circumferential line. The transverse seam 7 extends around the central circumferential line of the tube chamber 2 and connects in the direction of the circumferential line abutting contact regions of the airtight sheet material airtight to each other. In the illustrated embodiment, all tube chambers 2 are connected to each other via a continuous piece of the airtight sheet material. If one of the tube chambers 2 is defective, a minimum necessary tire pressure can be maintained from the remaining three sealed tube chambers. So that at a later leakage of another tube chamber still enough tight tube chambers 2 are available, the contiguous

Hose chambers 2 replaced on occasion.

It would also be possible, for example, for only two hose chambers 2 each to be connected to each other as a set via the airtight flat material. For an easier assembly, it would be advantageous if the two sets were then releasably connected via a connecting device to a stack of hose chambers. The replacement of a set with a defective tube chamber would be made possible by means of connectable and detachable connections to the feed lines 5 between the tube chambers 2 and the common feed connection 6. Undamaged sets and the tire can still be used. 3 to 10 illustrate the method of manufacturing a pressure-securing device 1 having four hose chambers 2. First, at least one piece of airtight sheet 9 is cut to a length associated with the length of a central central circumferential line of the hose chambers 2. The two longitudinal ends 10 of each piece of airtight flat material 9 are brought into contact with each other to form a closed band 11. Between these ends 10, the transverse seam 7 is formed such that it extends transversely to the circumferential lines of the hose chambers 2 in the hose chambers 2 to be formed and connects airtight to each other in the direction of the circumferential lines abutting contact areas of the airtight Flachma- terials.

The longitudinal ends 10 may, as shown in FIGS. 3 to 6, be brought into contact with one another overlapping each other with contact surfaces extending from the ends 10. The type of transverse seam 7 and an optionally provided sealing element are selected according to the respective type of contact and depending on the material in the contact surfaces. In addition to the illustrated overlap, in which the end faces of both longitudinal ends 10 are directly adjacent to each other, there is also the embodiment in which the one longitudinal end 10 extends beyond the other, so that there is a gap between the two end faces. In the case of an overlapping contact, it is optionally possible to dispense with a sealing element, or the sealing element is inserted as a sealing strip 12 between the overlapping contact surfaces.

If a sealing strip 12 is used for the transverse seam 7, then it is expedient to also use sealing strips 8 for the longitudinal seams. The arrangement of sealing strips 12 is particularly simple on a flat, airtight flat material, so that it is advantageous if all the sealing strips 12 required for the transverse seam and the longitudinal seams are already arranged on the airtight flat material with adhesive bonds before the formation of a closed strip 11 they remain in the formation of a closed band 1 1 at the desired location and for the

Longitudinal seams 8 come to lie in the positions shown schematically in FIGS. 1, 2 and 7 to 12.

The dense transverse seams 7 shown in FIGS. 3 to 6 comprise, for example, a sealing strip 12 and a seam sewn with at least one thread. Preferably, the contact surfaces of the airtight sheet over the sealing strip 12 by means of an adhesive seam and / or a sealed seam and / or a fusion seam airtight connected to each other. In the illustrated embodiment, the airtight flat material comprises a first layer 9a of an airtight film and a second layer 9b of textile flat material. The stitched with at least one thread seam and the textile sheet material ensure a robust mechanical connection. In order to facilitate the handling of the at least two-ply airtight flat material, the first layer 9a or the airtight film is connected via an adhesive bond with the second layer 9b or with the textile flat material. The textile sheet 9b is formed so that desired deformation properties of the hose chambers 2 can be achieved. In a preferred embodiment, the textile flat material 9b comprises stitches and / or wraps and is thus designed as knitwear, preferably knitwear, optionally knitwear, crocheted or Bobinet ware. The airtight film 9a is an elastically deformable plastic film, preferably with polyurethane, in particular with a thermoplastic polyurethane elastomer.

The textile flat material can ensure the respective desired deformation and load properties in predetermined regions of the hose chambers 2. According to FIG. 6, the textile flat material 9b may also comprise reinforced regions 9c which, after the formation of the tube chambers 2, extend along their outer circumferential regions. For reinforcement, the reinforced regions 9c can be formed with particularly strong threads, or loadable threads can additionally be introduced into the textile flat material.

The air-tight film 9a is preferably somewhat more deformable and ensures the necessary tightness in every possible deformation of a hose chamber 2. By assembling a desired airtight sheet material and the appropriate shapes of the tube chambers 2 can be ensured in preferred embodiments, that the airtight sheet material of each tube chamber 2 is elastically deformable at least in the direction of its central circumferential line, in particular at least to 1 .5 times the unstressed resting length. Preferably, it is also elastically deformable in the direction of its central circumferential line, wherein preferably the elasticity around the central circumferential line is greater than along the central circumferential line. If the gluing, sealing or encrusting bond is sufficiently strong mechanically, a stitched seam with a thread can be dispensed with. The illustrated closed bands 1 1 have at the cross seam 7 a region of the course of the closed band 1 1 is away. When this projecting portion interferes, as shown in Figs. 1, 2 and 7 to 12, a transverse seam 7 is formed in a butt joint of the airtight sheet. In a blunt or end-to-end contact of the interconnected ends 10, the small-area end faces form the contact surfaces, so that preferably a sealing element is used for a reliable connection, which is tightly connected to both longitudinal ends. For example, two portions of a weather strip are each overlapped with one end of the airtight sheet.

From at least one closed band 1 1, a double-layered area along the circumference of the band is formed. In this double-layered area 2 longitudinal seams 8 must be formed to form the hose chambers. If the airtight sheet material on the two surfaces of different material, such as textile sheet or a film, the closed band must be left in the form or everted, that the inwardly facing surface necessary for forming the airtight longitudinal seams material and possibly already comprises sealing strips 12 adhering to the airtight flat material.

In the closed bands shown in Figs. 3 to 6, the airtight film 9a and the sealing strips 12 are arranged on the band inside when forming the transverse seam 7. They are then turned over so that the dense film lies on the outer side of the tape. In a further processing step, as shown schematically in FIGS. 7 and 8, both lateral edge regions of a closed band 1 1 are folded transversely to its circumferential direction and brought together so that both lateral edge lines 1 1 a meet one another. Between the resulting double-layered region, in the illustrated embodiment, three sealing strips 12 are arranged, in which the sealing strips shown in FIG. 9 and 10 shown longitudinal seams 8 are formed.

The three longitudinal seams 8 are formed so that they are closed annularly extending in the resulting tube chambers 2 next to the central circumferential line and connect airtight to each other at the longitudinal seams 8 adjacent contact areas of the airtight sheet material airtight. In the middle longitudinal seam 8 is the double-layered area together with the two lateral Border lines 1 1 a connected. Also in the case of the two laterally arranged longitudinal seams 8, a connection is always formed between mutually associated circumferential regions of both layers of the double-layered region. If the folding over of the two lateral edge regions of a closed band 1 1 is too time-consuming, the four tube chambers 2 can also be achieved by arranging a second closed band 11 around a first closed band and five longitudinal seams 8 instead of the three longitudinal seams 8 become. To provide two nested closed bands 11, it is expedient for two pieces of the airtight sheet to be arranged on top of each other and formed together into one band, the longitudinal ends of both pieces being connected in pairs separately from each other. Desired sealing strips are placed on one of the pieces prior to assembling the two pieces.

The hose chambers 2 shown in FIGS. 9 and 10 each comprise a chamber opening 1 3, to which a feed line 5 can be connected in an air-tight manner. Preferably, one eyelet is used in each chamber opening 1 3, which in particular with respect to the direction of the circumferential lines has an alignment feature, so that a on-trailer in a desired orientation can be inserted into the eyelet. In the illustrated embodiment, the chamber openings 13 and correspondingly the eyelets are oval, so that a connection part 14 according to FIG. 14 is arranged with a corresponding oval seal seat 14a after pressing the seal seat 14a in an eyelet in the desired alignment position on the hose chamber 2.

14 shows an embodiment of a differential pressure closing device, which makes the connection through the common feed connection 6 to a defective tube chamber 2 closable. It comprises a closure device arranged at the chamber opening 1 3 of a hose chamber 2 with a connection part 14 tightly arranged at the chamber opening 1 3. The connection part 14 comprises a connection from a connection 14b for the feed line 5 to the connected end 15a of an arranged in the hose chamber 2, In the desired orientation, the line loop 15 is aligned such that the radius of curvature of the line loop 1 5 in the case of a defective and therefore flattened tube chamber 2 due to a nes overpressure is squeezed in at least one intact Schiauchkammer 2, so that the connection from the port 14b in the tube chamber 2 is interrupted and when refilling compressed gas through the common feed connection 6, the supplied compressed gas can not escape through the tube chamber 2 with the leak but at least one other tube chamber 2 fills (Fig. 1 1).

13a, 13b and 13c show an embodiment of the common feed connection 6, which comprises a feed opening 16 and openings 17 to the feed lines 5, not shown, and connections which can be closed therebetween. In the situation according to FIG. 1 3a are formed on a central conical portion of a valve member 1 8a formed closure portions 1 8 of the spring 1 9 against the adapted receiving portion 20a of the housing 20, so that all connections from the feed opening 1 6 to the openings 1 7 are closed. At the openings 1 7 feed lines 5 can be tightly connected via detachable connections.

In the situation according to FIG. 1 b, the feed opening 1 6 of the common feed connection 6 is connected to all openings 1 7 due to the inserted central pin 21, the central conical section of the valve part 1 8a displaced therewith and the closure areas 1 8 thus brought into the open position. Compressed gas can be added via the feed port 6 and feed lines, not shown, in hoses not shown or drained from these.

The housing 20 comprises two housing parts 20b and 20c which can be screwed together and a sealing element 20d arranged therebetween, wherein the first housing part 20b has the openings 17 and accommodates the spring 19 and the second housing part 20c via a thread with the inner connection opening at a passage opening the rim 3 fixable valve portion 21 is connected. The valve section 21 comprises a main part 22 and a sleeve 23 which can be screwed tightly thereon. Elastic connecting rings 24 of the main part 22 and the sleeve 23 allow the valve section 21 to be clamped to the passage opening of the rim 3.

In the illustrated embodiment, the closure regions 18 are arranged at a conical region with a circular cross section, this region too a valve member 1 8a belongs, which is slidably mounted in the housing 20 correspondingly formed and connected to the central pin 21.

Claims

claims Pressure-securing device (1) for compressed gas filled wheels, with at least two in a tire (4) to be arranged and thereby side by side along circumferential lines around the tire axis extending annularly closed tube chambers (2) to be connected via a respective feed line (5) to a common feed connection (6), wherein the tire (4) on a rim (3) can be mounted, characterized in that the hose chambers (2) are formed from a flexible, airtight flat material and each tube chamber (2) with a transverse seam (7) and at least one longitudinal seam (8) is formed, wherein the at least one longitudinal seam (8) adjacent to the central circumferential line of this tube chamber (2) extending annularly closed and transverse to the circumferential line abutting contact areas of the airtight flat material airtight interconnects and the transverse seam (7) extends around the central perimeter of this tube chamber (2) and in the direction of Circumferential lines adjoining contact areas of the airtight flat material hermetically interconnects. Pressure-assurance device (1) according to claim 1, characterized in that at least two hose chambers (2), preferably at least four hose chambers (2) formed with a contiguous piece of airtight sheet material (9) and thus over portions of this piece of airtight sheet material (9 ) Are connected to each other, and that optionally at least a partial surface of the outer surface of the tube chambers is provided with adhesive material. Pressure-securing device (1) according to claim 1 or 2, characterized in that each longitudinal seam (8) and each transverse seam (7) formed as stitched with at least one thread seam and / or as an adhesive seam and / or as a sealing seam and / or as a fusion seam is, which is preferably elastically deformable in its longitudinal direction, wherein in particular between the interconnected contact areas, a sealing element (12) is arranged, which ensures an airtight connection between the contact areas. 4. pressure assurance device (1) according to one of claims 1 to 3, character- ized in that the airtight flat material at least a two-ply flat is material and a layer of textile sheet (9b) and another layer comprises an airtight film (9a). 5. pressure assurance device (1) according to claim 4, characterized in that in at least two-ply flat material of the hose chambers (2) the textile Flat material (9b) is connected via an adhesive bond with the airtight film (9a). 6. Pressure-securing device (1) according to claim 4 or 5, characterized marked, that the textile flat material (9b) comprises stitches and / or wraps and is preferably knitwear, in particular knitted fabric, optionally knitted fabric, crocheted or Bobinet-Ware. 7. pressure assurance device (1) according to one of claims 4 to 6, character- ized in that the airtight film (9a) is an elastically deformable plastic film, preferably with polyurethane, in particular with a thermoplastic polyurethane elastomer. 8. pressure assurance device (1) according to one of claims 1 to 7, character- ized in that the airtight flat material of each tube chamber (2) is elastically deformable at least in the direction about its central circumferential line, in particular at least to the 1 .5 times the untensioned rest length, and preferably also in the direction of its central circumferential line is elastically deformable, wherein preferably the elastic extensibility around the central circumferential line is greater than along the central circumferential line. 9. pressure-securing device (1) according to one of claims 1 to 8, characterized in that at each tube chamber (2) has a chamber opening (1 3) is formed, to which the feed line (5) is airtight connectable, preferably an eyelet is inserted into the chamber opening (13), which has an alignment feature, in particular with respect to the direction of the circumferential lines, so that a connection part (14) can be inserted into the eyelet in a desired orientation. 10. Pressure-securing device (1) according to one of claims 1 to 9, characterized in that the pressure-securing device (1) comprises a tire (4) and the circumferential lengths of the tube chambers (2) are fitted to these tires (4) so that, after placing them in the tire (4) and inflating to a first degree of filling, with their smallest circumferential lines facing the tire axis at a radius run around the tire axis, which is larger by a predetermined amount than the inner radius of the tire edge lines with the smallest circumference of the tire (4), wherein the tire edge lines in the mounted state on a rim (3). Pressure-assurance device (1) according to one of claims 1 to 10, characterized in that the pressure-securing device (1) comprises a common feed connection (6), feed lines (5), a tire (4) and a rim (3). holds, wherein the hose chambers (2) in this tire (4) and the tire (4) with the hose chambers (2) on this rim (3) is arranged, the feeders (5) are connected to the common feed terminal (6) common feed connection (6) is arranged on a passage opening of the rim (3) and comprises a feed opening (16) and for the feed lines (5) closure areas (18). Pressure-assurance device (1) according to claim 1 1, characterized in that the pressure-securing device for each tube chamber (2) comprises a differential pressure closing device, which closes the connection through the common feed connection (6) to a defective tube chamber (2). whereby each tube chamber (2) is assigned a closure device which, in the event of a defective tube chamber (2), opens the connection from the feed opening (16) into the defective tube chamber (2) due to overpressure in at least one intact tube chamber (2). closes. Pressure-securing device (1) according to claim 12, characterized in that the closure devices are arranged on chamber openings (13) of the hose chambers (2) and each closure device is arranged on the chamber opening (1 3) densely arranged connection part (14), wherein the connecting part (14) comprises a connection from the feed line (5) to an open loop (1 5) located at the free end (1 5b) in the tube chamber (2) and oriented in the chamber opening (1 3) such that the radius of curvature of the tube Line loop (1 5) with a defective and therefore flattened tube chamber (2) due to overpressure in at least an intact hose chamber (2) is squeezed, so that the connection from the feed line (5) is interrupted in the tube chamber (2) and when refilling compressed gas through the common feed port (6), the supplied compressed gas is not through the tube chamber (2) can escape the leak, but the at least one other tube chamber (2) fills. Method for producing a pressure-securing device (1) for compressed gas-filled wheels, having at least two annularly closed hose chambers (2) to be arranged in a tire (4) and running side by side along circumferential lines around the tire axis, each of which has a feed line (5) at a common feed connection (6), wherein the tire (4) can be mounted on a rim (3), characterized in that the hose chambers (2) are provided with at least one transverse seam (7) and at least one longitudinal seam (8 ) are formed from a flexible, airtight flat material, wherein at least a portion of the airtight sheet material (9) is cut to a length corresponding to the length of a central central circumferential line of the tube chambers (2), the two longitudinal ends (10) of the at least one piece of the cut airtight sheet material (9) are brought into contact with each other to form at least one closed band (11) and between them the at least one transverse seam (7) is formed so as to extend extending at the tube chambers (2) to be formed transversely to the circumferential lines of the tube chambers, and in the direction of the circumferential lines abutting contact areas of the airtight flat material airtight interconnects, and from at least one closed band (1 1) along the band circumference a double-layered area is formed, in that at least one of the two lateral edge regions of a closed band (11) is transferred transversely to its circumferential direction or in that a second closed band (11) is used around a first closed band (1), and at least one longitudinal seam (8) is formed in the double-layered region such that it is annularly closed next to the central circumferential line of the resulting tube chamber (2) and airtightly connects contact regions of the airtight flat material abutting each other in the longitudinal seam (8). 15. The method according to claim 14, characterized in that each transverse seam (7) and each longitudinal seam (8) is formed as seam sewn with at least one thread and / or adhesive seam and / or as a sealing seam and / or as a fusion seam, which preferably in their longitudinal direction is elastically deformable, wherein prior to forming a transverse seam (7) or a longitudinal seam (8) in particular a sealing element (12) between the interconnected contact areas is arranged, which after creating the seam (7, 8) an air-tight connection between ensures both contact areas. 16. The method according to claim 14 or 15, characterized in that the airtight flat material before the formation of seams using a layer of textile flat material (9b) and a layer of an airtight film (9a) is assembled to form at least two-ply flat material and these two layers are arranged and closed in at least one piece of the at least two-ply flat material (9) together to form the tube chambers (2), wherein preferably one continuous piece of the airtight flat material (9) is used to form at least two tube chambers (2). , in particular of at least four hose chambers (2) is used, which are connected to each other via this piece of airtight sheet material (9).