DE102004053985B4 - Hose line with a support ring - Google Patents

Abstract

Under changing internal pressure flexible charge air hose line (17) for transporting process air during intercooling in motor vehicles with at least one support ring (29) for stabilizing the charge air hose line (17), wherein the charge air hose (17) is formed of an elastic material and contains a plurality of layers, which also includes an insert (28) serving for stiffening, wherein the at least one support ring (29) engages around the outside of the hose (17) to stabilize it, and wherein the at least one support ring (29) is molded from plastic and tensile strength gap-free in the circumferential direction, is formed continuously.

Description

The The present invention relates to a changing internal pressure standing hose line with a support ring.

to fluid connection two components that are relatively movable, are usually hoses made of an elastic material, such. B. elastomer, used, their flexibility allows axial and radial relative movements between the components. In the wall of such a flexible hose can reinforcing thread inserts be embedded from a textile material or metal. Higher, through radial pressure forces caused shear stresses can the deposits but hardly endure. The flexible hoses for liquid or gaseous cooling media Therefore, in the prior art are generally not sufficient stable to high pressures and to withstand pressure amplitudes of the fluid passing therethrough. she would inadmissible be widened, wear out or even tear. Of the Hose can with an outer braid be provided of a metal wire or tape, which, however, its multiaxial flexibility limited becomes.

It are also flexible bellows hoses known, which has a ring-shaped Have shape and for feeding compressed charge air can be used to an internal combustion engine. The bellows hoses are usually between a compressor of a supercharger, the air from the atmosphere sucked and compressed, and the entry of an intercooler or between the radiator outlet and the engine. The cooler that cools compressed charge air from before this over a manifold too the engine arrives. The charge air cooling can to the normal radiator circuit of the vehicle (charge air / coolant cooling) connected and held on the vehicle body or on a separate radiator or frame-fixed charge air / air cooler be realized with a separate air flow, while the turbocharger on the elastically mounted motor is attached. In operation, the hose is similar because of its flexibility and its bellows form the relative movements between the engine and the radiator out.

The occurring loads in turbocharged engines, in particular the high and changing charge pressures and temperatures, the bellows hose can not withstand without additional support. The loading pressures can 1.5 bar for passenger cars, and 3.5 bar for commercial vehicles. Furthermore must the Hose can withstand extremely fast changing temperatures between -50 ° C and + 250 ° C. The pressure and temperature-related loads can lead to expansion and vibration lead the hose, which can damage the material of the hose or the geometric Structure or structure as inappropriate appear. braids, as with the outside cylindrical shaped hoses, are not possible with a bellows hose by design.

to Stabilization are therefore usually used support rings, the Completely surround the hose at several points and its bellows shape to back up. The support rings are made of a steel wire that is cut to the required length and is bent to a circle. The opposite free ends are joined together and the joint by laser welding, resistance welding or soldering closed.

adversely is that steel is a much sought after and relatively expensive material. Furthermore is the production, especially because of the welding or soldering process and the subsequently required deburring the joint, relatively expensive and therefore expensive. Furthermore, a complex quality control, For example, a fluoroscopy by X-rays or destructive Stress test required to ensure that the seam is sufficient is stable and the hose is not damaged by these in use.

Of Furthermore, certain surface textures, including Paint, and a surface protection for corrosion and acid resistance demanded that exclusively can be produced by painting, chemical treatment or the like. supporting rings but are mass goods whose production costs are low are.

FR 2 816 027 A1 describes a flexible hydraulic connection for sewage, dirty water, rainwater or toilet drains with a tubular deformable hose, which has a straight extension and at the ends of application-specific connection sleeves are provided. The tube is surrounded by several rings, which are embedded by vulcanization in the tube cover to convert the tube into a functionally required form of hose can. The material of the rings and the tube are chemically compatible with each other to ensure good anchoring of the rings in the outer surface of the tube.

CH 406 755 describes a tube of electrical insulating material which is provided to prevent deformation by external pressure with a plurality of spaced apart along the tube arranged rings. The rings are made of metal, especially tempered steel. The flexible hose serves to direct water from distribution heads to cooling channels that are around stator windings of large turbogenerators with combined gas and water cooling are formed around. The metal rings allow the pressure of the cooling gas within the generator housing to be increased without squeezing the water cooling hoses.

EP 0 374 597 A2 describes a composite tube for use in high pressure, high temperature, and high vibration environments where the tube has multiple layers, including a textile liner and a tubular cover with a bulge. The hose has no support rings.

EP 0 856 696 B1 describes a charge air hose for promoting charge air for motor vehicle internal combustion engines, wherein the charge air hose is formed by a bellows hose with a connection serving V-clamp and several wave crests and valleys and wherein in the V-clamp and in the troughs support rings are arranged.

outgoing It is an object of the present invention, a flexible Charge air hose of the type mentioned above with a new functional support ring to create, which is suitable to the hose reliably to back up. In particular, the support ring should be relatively simple and inexpensive, preferably under application of high quantities to be finished. Furthermore should be a convenient adaptability of the support ring to the requirements in terms of its design, its cross-sectional shape, surface texture and the like. Be given.

A Another object of the present invention is a hose line with such a support ring to create such that even at high and possibly variable Inner pressure over one long service life sufficient stability and tightness ensures.

These Tasks are performed by a charge air hose according to claim 1 solved.

According to the invention is a flexible charge air hose under varying internal pressure for transporting process air during intercooling in motor vehicles with at least one support ring for stabilizing the charge air hose line, wherein the charge air hose is formed of an elastic material is and contains several layers, to which also serves a stiffening deposit, where the at least one support ring the outside of the Hose line engages to stabilize it, and wherein the at least one support ring is cast from tensile plastic and is free of gaps in the circumferential direction, is formed throughout.

According to the present Invention is the support ring So cast from tensile plastic and gap-free in the circumferential direction, formed throughout. It has been shown that a made of tensile plastic manufactured support ring provides sufficient tensile strength and rigidity to a lower high, especially under changing internal pressure hose line to stabilize. The use of plastic brings over steel many advantages. The material costs can be significantly reduced and the specific gravity is reduced many times what for handling, including the transport is beneficial. Plastic is also easier and recyclable with far less energy.

By To water, in particular injection molding of support ring Made of plastic, this can be solid, stiff, one-piece and in the circumferential direction continuous, so formed without a gap or a separation point become. A post-processing, for example. One required for a steel ring welding and deburring, deleted as well as the danger that the hose cover will be damaged by the weld. The manufacturing process is simplified, fast and automatable. The molds used as tools can for high numbers be interpreted. A quality control can little effort and non-destructive respectively. In the simplest case, a weight comparison and / or an exam by ultrasound. Both can be automated. All in all So the profitability is increased significantly.

By suitable choice of plastic and a predetermined tensile strength can the support ring sufficiently stiff and stable be trained to effectively pressure and / or temperature To reduce expansions and vibrations of the hose line thus be exposed to high pressure and temperature changes can. The support ring restricts the axial and radial flexibility and flexibility of the hose not a, which is required to relatively moving components fluidly with each other connect to.

Advantageously, a thermoplastic resin based on polyamide is used for the inventive slip ring. Because of its very favorable physical properties, in particular a high tensile and compressive strength as well as good abrasion and wear resistance, in particular polyamide 6.6 has proved favorable for the application. In addition, polyamide 6.6 has good mechanical damping and is readily usable at high temperatures. Furthermore, it is resistant to oils, greases and lubricants and can with suitable composition also withstand acids. The support ring according to the invention is resistant to corrosion and long-term stability. Its chemical and thermal properties can be further improved by suitable additives. In addition, polyamide is injection-moldable and can be reworked by conventional methods, paint or print.

Under Tensile plastic is within the scope of the present disclosure in particular a fiber-reinforced To understand plastic. According to the invention, the plastic, eg. Polyamide 6.6., Preferably added glass and / or carbon fibers. Of the Proportion of these reinforcing fibers should total at least 5% by volume and preferably up to 10-20% by volume or even more.

Preferably are the tensile strength enhancing Fibers embedded in the plastic body in a disordered or disoriented manner. The reinforcing fibers are therefore in irregular order aligned in different directions. This can be targeted by suitable mixing of the reinforcing fibers with the plastic granules before a casting process or by suitable Alignment of the injection nozzles be achieved.

The Tensile strength of the support ring is relatively high, although according to the invention relatively short reinforcing fibers used, whichever is shorter than the average diameter the cross-sectional area of the support ring and / or the mean grain size of the plastic granules should be. Preferably, they are shorter than 0.6 mm on average. In a moment preferred embodiment is their medium length about 0.4 mm. This leaves by appropriate preprocessing of the glass or carbon fibers to ensure. Due to the short fibers is a good networking or Bonding and thus compared to long fibers a better connection structure especially in the area of the flow point or flow points generated. Furthermore It does not come as in long fibers to the formation of balls that the Structure and stability affect.

Independent of its construction, the tensile plastic is preferably capable of Press in the tubing up to at least 1.5 bar, preferably to to 3.0 bar or above withstand. Furthermore it is preferably in a temperature range of at least -30 ° C to + 150 ° C, preferably between -50 ° C to about + 250 ° C can be used, without the plastic ring unacceptable Dehn- or Kriecherscheinungen shows.

Of the Plastic ring can be particularly reliable and economical in the Injection molding can be produced, suitable for mass production particularly suitable. Injection molding tools and processes leave high numbers to. By exactly specifiable tool geometry, injection speed and direction any, even complex cross-sectional shapes of the support rings get and shape, weight and dimensional accuracy very precise be respected.

Prefers becomes a multi-point gate, with multiple injection points in the circumferential direction the injection mold are preferably distributed uniformly, around the flow points, where the viscous casting compounds flow together and join, evenly distribute. Also suitable is the film casting, in which by a thin Angussspalt a flat sprue is injected, with a targeted disorientation the reinforcing fibers while the injection process is possible. It is also advantageous if the injection molding material immediately before Injection, for example by heating the Anspritzkanäle heated becomes.

Of the Plastic support ring according to the invention preferably not post-processed. Once the spray form taken, is the support ring ready for use. In particular, no burr removal is required. If necessary, however, a post-processing is also possible.

Of the support ring can take the form of an annular, largely rotationally symmetrical body with arbitrary over the Be circumference of defined cross-sectional area injected. The support ring can especially for the associated Hose, in particular a wave-shaped bellows hose, fitting be designed. To increase the stiffness, the cross-sectional area of the support ring deviating from a circular area Have shape. With regard to the radial forces occurring has itself a radially expanded shape of the support ring proved to be particularly suitable.

Of the Plastic support ring according to the invention can formed relatively thin in the width direction be. However, it is thicker than comparable tensile strength a steel ring and thus has a lower tendency to get into the Cut the ceiling of an elastomer hose. Cheap is also the low surface roughness of the plastic support ring.

Of the support ring has several functional surfaces or areas on. In particular, a radially inner receiving surface is preferably provided, the one central opening defined for receiving the hose. The inner receiving surface can in cross section corresponding to the curvature of the troughs of a Balg hose arched be. The controllable injection process and the specified tool geometry allow one high concentricity.

In addition, points the support ring preferably axial contact surfaces for the Hose line, in particular a bellows hose on. For example. can the axial Flanks following the inner surface as abutment and support surfaces for the hose with every optional outer contour and tight shape tolerance be shaped. Sections of the axial bearing surfaces can in particular be flat or even be designed very plan. It can be a high runout accuracy be ensured.

Further can the support ring an outer surface portion have, also out of round, for example, just or in terms of any axial forces wavy can be designed.

The inner diameter of the central opening of the support ring is arbitrary depending on the outer diameter of the hose and is preferably between 30 and 150 mm, while the cross-sectional area of the ring depending on the requirements between 3 and 12 mm ² , preferably about 6 to 10 mm ² ,

at an advantageous embodiment the invention is the cross-sectional area of the support ring in terms of their Shape and / or size like that designed that over the periphery gives a nearly constant tensile strength. For example. can flow points of the plastic support ring by cross-sectional enlargements reinforced be. These are preferably in the region of flow points on the radially outer side of the support ring provided while the inner diameter of the support ring over the Scope remains the same.

the Plastic granules can advantageously also be added coloring additives, the support ring one adapted to the tube, black or a different, give individual color, as is often required. It is no longer necessary, the support ring to paint only after the production. In addition, the color in the course the operating time does not flake off.

According to the present Invention is the flexible tubing used for passage a pressurized fluid is created, for example. From a Made by elastomer and embedded inserts, eg. By a kevlar knit reinforced for stiffening. The hose is according to the invention with at least a plastic support ring of the type described above, mounted on the hose is to stabilize it. In a preferred embodiment is the hose line of two or more plastic support rings surrounded, preferably in the axial direction uniformly from each other spaced apart and to the shape and size of the hose are adjusted.

The supporting rings can formed at a given tensile strength in the radial direction sufficiently elastic be in order to be intrinsically rotationally extruded and wound hoses compensate for production-related radial deviations from the roundness to be able to. Advantageously, the flexibility applied by the radial support structure of the mechanical strength member in the hose, for example. Elastomer hose, positively supported and thereby the continuous operating behavior of the hose module at high Temperature and pressure change intervals, especially in extruded hoses, increased to the required values. Due to a friction-dependent surface structure of the rings extreme strains of the hose at high pressure amplitudes or compressions be effectively prevented at pressure relief.

In a preferred embodiment is the hose line in the form of a bellows hose with in the longitudinal direction formed several wave crests and troughs, wherein in several troughs respectively a plastic support ring is arranged. Such a hose is in a particular preferred use as a charge air hose for motor vehicles for transport used by process air in charge air / air cooling. Advantageously, in the Compared to steel lower heat conduction coefficient the plastic to prevent partial lowering of temperature at the hose wave valley in the area of the ring system. By heat impermeability In this area, damage, eg. hardening or embrittlement, prevented as a result of plant-specific temperature change intervals.

Further advantageous details of embodiments of the invention result from subclaims, the drawing and the associated Description. In the drawing is an embodiment of the article represented the invention. Show it:

1 a charging system of a motor vehicle with indirect charge air cooling to illustrate a preferred application of the invention, in a highly schematic schematic diagram,

2 one with the charging system 1 used hose according to the invention in a simplified longitudinal sectional view, in half section,

3 a section of the invention provided with plastic support rings tube after 2 in a simplified, enlarged sectional view,

4 an injection mold for the production of Plastic support ring, in a highly schematic representation, in plan view,

5a to 5c different cross-sectional shapes of in 3 illustrated support ring, in highly simplified representations, and

6 a further preferred application of the invention for a charging system of a motor vehicle with direct intercooling, in a highly schematized schematic representation.

1 shows a highly schematic way a charging system 1 for an internal combustion engine of a motor vehicle with a loader. As is well known, a supercharger is used to increase the air flow rate of an engine at a constant displacement and constant engine speed by compression of the process air required for combustion of the fuel to increase the power density. Although loaders of different types of function and design, for example different mechanical, turbocharger or pressure wave loaders, are known, this is not relevant to the present invention. To illustrate, an exhaust gas turbocharger is assumed.

An exhaust gas turbocharger consists of two turbomachines, namely a turbine not illustrated here in detail and a compressor 2 mounted on a common shaft. By means of a turbine wheel, the turbine uses the energy contained in the exhaust gas to drive the compressor 2 , The compressor 2 sucks via an air filter, not shown here, at an intake port 3 of the compressor 2 connected, fresh air and compacts them. This is in a compressor housing 4 a compressor wheel 5 arranged, which rotates due to the rigid connection with the turbine wheel at the same speed as this. The sucked air is in the compressor wheel 5 To the larger wheel circumference strongly accelerated and with high speed into a diffuser 6 discharged, in which the kinetic energy of the air is converted into pressure energy. The thus compressed process air is then via a pressure connection 7 of the compressor 2 and a flow channel 8th to the cylinders of a combustion engine 9 pressed.

The internal combustion engine 9 can be of any type, eg. As a diesel engine or a gasoline engine, and is here only schematically by a motor housing characterizing block 10 with a manifold 11 shown. The compressor housing 4 can on the elastically mounted motor housing 10 or be stored independently of this. The flow channel 8th extends from the pressure port 7 of the compressor 2 up to the manifold 11 of the motor 9 ,

In the flow channel 8th is a charge air cooler 12 inserted, which serves in the compressor 2 cooling air heated by compression and thus the density of the arrows 13 indicated charge air and increase the amount of oxygen to the engine 9 to deliver as much oxygen as possible. This can increase the power of the engine. It also reduces the engine 9 supplied cooler process air its heat load and increases its reliability and service life. The intercooler 12 is usually due to the cooling water circuit of the engine 9 connected and, for example, mounted on the body of a vehicle. It has an input connection 14 and an output terminal 15 on.

To the flow channel 8th include a first connection line 16 that the pressure connection 7 of the compressor 2 with the input connector 14 of the intercooler 12 sealingly connects and a flexible conduit element 17 contains, as well as another connecting line 18 that from the exit 15 of the intercooler 12 to the manifold 11 of the motor 9 leads and also a flexible conduit element 17 contains. The flexible pipe elements 17 on both sides of the radiator 12 are essentially the same design, so that the following description of the structure and operation of the relative to the radiator 12 input side flexible line elements 17 enough. The connection line 18 can in principle also be formed in different ways, for example by a simple flexible hose or by a suitable pipe arrangement.

The flexible conduit element 17 is formed according to the invention in the form of a bellows tube. As in particular from the 2 and 3 shows, the bellows hose 17 between two substantially hollow cylindrical end portions 19 . 21 , for example, to connect to the terminals 7 . 14 are set up, a middle section 22 on, which has a plurality of annular ribs. In other words, the middle section is designed to be ring-shaped in its longitudinal or axial direction, with arcuate peaks 23a - 23e and troughs 24a - 24d alternate each other. Neighboring wave mountains 23 and troughs 24 are each by substantially rectilinear flanks 25 of the hose 17 connected with each other.

The bellows hose 17 may in principle be single-layered, but is preferably formed of multiple layers. How out 3 shows, the hose points 17 an inner layer, also called soul or inliner 26 and an outer layer or ceiling 27 on, both of which, for example, consist of an elastomer. Between the layers 26 and 27 is preferably one for stiffening the hose 17 serving deposit 28 , z. As an embedded Kevlar knit inserted.

The bellows tube thus formed is for the fluid connection of the intercooler 12 with the compressor 2 or engine 9 well suited. Its flexibility allows for axial and radial relative movements between the compressor during operation 2 or engine 9 and the intercooler 12 too, due to different vibrations of the engine 9 and the vehicle body are caused. Alternatively, here the vibrations of the vehicle frame can be compensated for frame-mounted installation of the cooling system, since here usually a tendency to tilt occurs due to the usual 2-point suspension.

However, the high, changing operating pressures and temperatures of the hose through the 17 passed through the charge air, the hose 17 to widen and vibrate. The possibly changing charge pressures are in passenger cars in a range between 0.1 bar and 1.5 bar. For commercial vehicles, they can even reach 3.0 bar. The temperature of the charge air can easily exceed 150 ° C. Such heavy loads can easily lead to material fatigue and eventually fatigue breakage of the hose. The kevlar knit 28 can not withstand the high radial forces caused by the boost pressures and breaks at excessive longitudinal fiber thrust.

To counteract this, according to the invention are a plurality of support rings 29 provided the bellows shape of the hose 17 secure without restricting its flexibility. Like from the 2 and 3 can be seen, are the support rings 29 so over the hose 17 raised that hose 17 Coaxially surround and here in the middle troughs 24b . 24c are arranged. Conveniently, the inner diameter of the support rings 29 relative to the axis of the bellows hose 17 according to the outer diameter of the hose 17 in the area of a wave trough 24 selected.

As further illustrated in the figures, each support ring 29 one to the course of the hose 17 in the area of the troughs 24 adapted, non-circular cross-section on. The cross-sectional area of the support ring according to the invention 29 is radially inwardly by a semi-circular or at least circular arc-shaped inner surface 31 of the hose 17 limited to the intake of the hose 17 is set up and matching the curvature of his wave trough 24 curved, for example, rounded. Following the inner surface 31 has the support ring 29 axial faces 32a . 32b on, which are preferably expanded in the radial direction and designed plan. The axial faces 32a . 32b serve as abutment or support surfaces for the flanks 25 of the bellows tube 17 , The faces 32a . 32b go into a radially outwardly facing, largely cylindrical outer surface 33 over, facing the outside of the wave mountains 23 radially recessed.

According to the invention, the support rings 29 injection molded in an economic way from a tensile plastic. Preferably, the plastic is based on polyamide 6.6 formed and thus by itself already very tensile and pressure resistant. To increase the tensile strength but the plastic granules reinforcing fibers, preferably glass and / or carbon fibers, added in a total content of at least 5 vol .-%. A currently preferred implementation contains 70 vol .-% polyamide, 10 vol .-% glass and carbon fibers and other additives. The reinforcing fibers should be relatively short, for example shorter than 0.4 mm, preferably not exceeding 0.3 mm, in order to achieve a good crosslinking or bonding and thus solidification of the plastic, in particular in the region of the flow points between the gate marks. For this purpose, it is also advantageous if the reinforcing fibers are relatively disordered contained in the granules. As further additives also colorants can be added to the support ring 29 For example, black and thus to make the hose fitting. This is often required by car manufacturers. It can easily be any color of the support ring 29 be achieved.

The plastic support rings according to the invention 29 are preferably produced by injection molding, which is known to be a low-effort, inexpensive and easy to control manufacturing process that is suitable for mass-produced articles. Even the most complicated forms can usually be realized in one operation.

In 4 is highly schematic a top view of an injection mold 34 illustrates that for the Mehrpunktanguss of the support ring according to the invention 29 is set up. The injection mold 34 has an annular hollow shape whose shape and size are specific to the support ring to be formed 29 is adjusted and the form and dimensional accuracy dictates. At the radially inner side of the injection mold 34 that of the inner surface 31 of the support ring 29 corresponds, are several, in this case three Anspritzöffnungen 36 provided by the wall of the injection mold 34 lead and are evenly spaced in the circumferential direction. The melted plastic mass is pressurized through nozzles not illustrated in more detail here through the injection openings 36 in the injection mold 34 sprayed and frozen in this. Already a short time after filling the support ring can be removed from the mold, for which the injection mold 34 For example, designed in the form of two half-bowls.

The through the Anspritzöffnungen 36 Injected sub-masses spread quickly and evenly in all directions of the injection mold 34 contained channel 37 out and fill this. The partial flows meet substantially in the middle between two Anspritzöffnungen 36 together and form flow points there 38 , as in 4 indicated. By controlling the pressure and temperature conditions during the injection process and targeted measures, for example, a heating of the injection nozzles, it can be achieved that the flow fronts of the partial streams combine well with each other during the meeting and thus at the flow points 38 to no noticeable reduction in strength comes. As a result, a through the injection mold 34 predetermined rotationally symmetrical, annular body of the support ring 29 obtained, which is in the circumferential direction continuously or continuously, that is free of any gaps or separation points, the example. For metallic material later, eg. By welding, would have to be closed.

In 4 are, for purposes of illustration only, the tensile strength increasing glass and / or carbon fibers 39 located. These are added to the plastic granules before melting and limited by pretreatment to a relatively short length and deliberately disoriented in all directions irregular.

The so far described bellows hose according to the invention 17 with plastic support rings 29 works as follows:
The support rings 29 can by stretching or folding the bellows tube 17 effortlessly pushed over this and in certain troughs 24 be positioned. The bellows hose 17 can advantageously already as a preassembled unit with attached support rings 29 can be delivered to then effortlessly on the connection 7 of the compressor 2 and at the entrance 14 of the intercooler 12 to be fastened in a tight manner. This can, for example, by means of clamps 35 or other conventional chucking done on the outside of the hollow cylindrical end portions 19 . 21 of the hose 17 be tightened.

In operation, the process air set by compression under high, alternating pressure and high temperature is supplied by the compressor 2 through the hose 17 to the intercooler 12 directed. At the same time the hose resembles 17 due to its bellows-shaped structure and flexibility relative axial and radial movements between the compressor 2 and the intercooler 12 out. Through to the troughs 24 and flanks 25 of the bellows tube 17 adapted profiling of the support rings 29 is the hose 17 through the support rings 29 always positive and secure. The support ring 29 pushes with the inner surface 31 against the close-lying wave troughs 24 and absorbs all pressure forces. With pressure increases, the flanks can 25 of the hose 17 at the radially extended end faces 32a . 32b the support rings 29 support. Thus, the tensile, stiff and largely temperature-resistant support rings act 29 effective expansion of the bellows tube 17 in the radial direction as well as vibrations and secure its bellows shape. Material fatigue, damage to the hose 17 and leakage is effectively prevented. Advantageously, however, the axially spaced-apart support rings limit 29 the flexibility of the bellows tube reinforced in this way 17 not a.

The use of plastic support rings 29 brings numerous advantages. The material is favorable in terms of the intended application and can also be obtained from recycled material or be self-recycled. The injection molding process enables easily controllable process sequences and thus a process-reliable production process with short process cycles. Any, even complex cross-sections and ring shapes with tight tolerances and high concentricity or axial runout accuracies can be produced. The size is arbitrary. The injection-molded support ring 29 No post-processing is required and the quality control effort can be reduced. In addition, the plastic support ring 29 absolutely corrosion-resistant and also resistant to oils or lubricants and thus suitable for different environmental conditions. By suitable additives, its mechanical, chemical and thermal properties and surface properties, including its color, surface roughness, etc., can be set as desired according to the needs.

As already mentioned, has in the connecting line 18 inserted flexible bellows hose 17 Essentially the same construction and the same operation as described above, taking into account that this between the radiator outlet 15 and the engine 9 is arranged and thus compensates for relative movements between them and already cooled charge air leads. The same applies in terms of benefits and modification options.

Numerous modifications are possible within the scope of the invention. For example. Can the length of the bellows hose 17 be chosen differently. Although the line 16 in 1 essentially completely through the bellows tube 17 is formed, it is understood that the bellows hose 17 can also form only a section of the same. The support rings 29 can in every wave trough 24 or placed only in specially selected troughs. Advantageously, the bellows hose 17 due to the relatively low weight of the plastic support rings 29 hardly charged. The support rings 29 can be made by film gate instead of multipoint gate. The hose 17 can be mounted in a straight arrangement or in a curved configuration in the manner of an angle tube, wherein the support ring 29 may have a matching, for example. Segment-like shape with continuously increasing and decreasing Ouerschnittsfläche. Furthermore, the support rings 29 Also suitable for securing flexible hoses, which are cylindrical outside, so have no bellows shape.

An advantageous development can be achieved in that the support ring 29 at the flow points 38 with cross-sectional enlargements 41 is provided as in 4 shown in dashed lines. The cross-sectional enlargements 41 are preferably on the radial outside 33 of the support ring 29 radially aligned with the flow points 38 arranged and can by suitable, for example. In plan view sinushalbwellenförmige protuberances 42 the injection mold 34 be achieved. Due to the cross-sectional enlargements 41 If necessary, any reduction in strength at the flow points can be compensated for in order to obtain an almost constant tensile strength over the circumference. Advantageously, the roundness and the inner diameter of the support ring remain 17 maintained.

Further advantageous embodiments of the invention are in the 5a - 5c and 6 illustrated. As far as matches in construction and / or function with the embodiment according to 1 to 4 Reference is made to the above description with reference to the same reference numerals.

The in the 5a to 5c illustrated backup rings 29 differ from that in the 1 to 4 illustrated only in the selected shape of the cross section and the outer surface 33 , While the support ring 29 according to 1 to 4 has substantially the same width and height, measured in the axial or radial direction, is the radial or vertical extent of the support ring 29 to 5a extended. This will be enlarged support surfaces 32a . 32b created, which are also suitable for larger pressure forces. The outer surface 33 in the embodiment according to 5a is also cylindrical. The embodiment according to 5b is essentially similar to that 5a but the outside surface is 33 here bent in cross section, for example. As the inner surface 31 Semicircular designed. In the embodiment according to 5c is the outside 33 wave-shaped so that the radial height varies in the axial direction and one with respect to one to the central axis of the support ring 29 vertical mid-plane asymmetrical training is created. This asymmetrical design can be applied to the bellows tube 17 acting axial forces of the fluid to be beneficial. All embodiments have in common that an enlarged lateral support geometry is achieved by the selected cross-sectional shape, the support of the bellows hose 17 supported.

6 illustrates a slightly modified form of use of a charging system 1 with direct intercooling. Here is one of a coolant cooler 43 the vehicle separate charge air / air cooler 12 ' provided in 6 as a stem unit on the coolant radiator 43 is mounted and is used via a (not shown) cooling fan for direct heat exchange. The cooler 12 ' can also be attached to the vehicle frame. Anyway, the attachment of the radiator 12 ' from the suspension of the engine 9 and the compressor 2 different. Between the at the pressure port 7 of the compressor 2 connected line 16 and the entrance 14 ' the radiator 12 ' as well as between the exit 15 ' the radiator 12 ' and to the engine 9 leading line 18 is in each case a bellows hose according to the invention 17 inserted, which creates a flexible flow connection. To avoid repetition, reference is made to the above description of the structure and operation of the plastic support rings 29 equipped bellows hose 17 directed.

Beyond the charge air supply is the hose according to the invention 17 with support rings 29 Also, for example, as a connecting line in hydraulic presses or for other applications used in which a standing under high, possibly changing pressure and high temperature gas-like or liquid fluid between two relatively movable components must be transported. In addition, the support rings according to the invention 29 As noise compensators, preferably be used in stretched tube geometries of elastomeric material.

A support ring 29 for a flexible flexible hose under pressure 17 is made of tensile, fiber-reinforced plastic by injection molding in such a way that the support ring 29 gap-free in the circumferential direction, is formed continuously. By a defined manufacturing process, for example. Heißkanalanspritzung, in conjunction with a specially selected plastic granules with glass and carbon short fibers is a networked structure of the support ring 29 formed, which meets extreme strength requirements under temperature and pressure influences. The support ring 29 has functional surfaces 31 . 32a . 32b for the positive reception and support of the hose line 17 , in particular a bellows hose, on. The hose line 17 is by the he attached to its outside inventive support rings 29 always stably secured in its shape even with high and varying internal pressures. Radial expansions and vibrations of the hose line 17 are effectively prevented without restricting their flexibility.

Claims (28)

Under changing internal pressure flexible charge air hose line ( 17 ) for transporting process air during intercooling in motor vehicles having at least one support ring ( 29 ) for stabilizing the charge air hose line ( 17 ), wherein the charge air hose line ( 17 ) is formed of an elastic material and contains a plurality of layers, including a serving for stiffening insert ( 28 ), wherein the at least one support ring ( 29 ) the outside of the tubing ( 17 ) in order to stabilize them, and wherein the at least one support ring ( 29 ) is molded from plastic and plastic resistant in the circumferential direction without gaps, is formed continuously. Charge air hose line according to claim 1, characterized in that the plastic of the at least one support ring ( 29 ) is formed on the basis of polyamide. Charge air hose line according to claim 2, characterized characterized in that the plastic is formed on the basis of polyamide 6.6 is. Charge air hose line according to claim 1 or 2, characterized characterized in that the tensile plastic is a fiber reinforced plastic is. Charge air hose line according to claim 4, characterized in that the plastic glass and / or carbon fibers ( 39 ) contains. Charge air hose line according to claim 4, characterized in that the proportion of reinforcing fibers ( 39 ) 5 vol.% To 10 vol.%. Charge air hose line according to claim 4, characterized in that the reinforcing fibers ( 39 ) are specifically embedded in a disoriented arrangement in the plastic. Charge air hose line according to claim 4, characterized in that the reinforcing fibers ( 39 ) are shorter than 0.6 mm on average. Charge air hose line according to claim 8, characterized in that the reinforcing fibers ( 39 ) are on average shorter than 0.4 mm. Charge air hose line according to claim 1, characterized in that the at least one support ring ( 29 ) is produced by injection molding. Charge air hose line according to claim 10, characterized in that the at least one support ring ( 29 ) is manufactured by Mehrpunktanguss or foil gate. Charge air hose line according to claim 10, characterized characterized in that the injection molding compound during the supply to the Heated injection points becomes. Charge air hose line according to claim 1, characterized in that the at least one support ring ( 29 ) is made without a post-processing subsequent to the casting process. Charge air hose line according to claim 1, characterized in that the cross-sectional area of the at least one support ring ( 29 ) to increase the strength of a deviating from a circular shape. Charge air hose line according to claim 14, characterized in that the at least one support ring ( 29 ) has a radially expanded cross-sectional shape. Charge air hose line according to claim 1, characterized in that the at least one support ring ( 29 ) an inner receiving surface ( 31 ) for the hose ( 17 ) having. Charge air hose line according to claim 16, characterized in that the at least one support ring ( 29 ) following the inner receiving surface ( 31 ) axial contact surfaces ( 32a . 32b ) for the hose ( 17 ) having. Charge air hose line according to claim 17, characterized in that the axial contact surfaces ( 32a . 32b ) are flat or have flat sections. Charge air hose line according to claim 16, characterized in that the at least one support ring ( 29 ) an outer surface portion ( 33 ) which is cylindrical in shape. Charge air hose line according to claim 1, characterized in that the mean diameter of the at least one support ring ( 29 ) between 30 and 150 mm and its cross-sectional area between 3 and 12 mm ² . Charge air hose line according to claim 20, characterized in that the cross-sectional area of the at least one support ring ( 29 ) is about 6 to 10 mm ² . Charge air hose line according to claim 1, characterized in that flow points ( 38 ) of at least one support ring ( 29 ) are reinforced. Charge air hose line according to claim 22, characterized in that the reinforcements by cross-sectional enlargements ( 41 ) at the flow points ( 38 ) are formed, wherein the inner diameter over the circumference is constant. Charge air hose line according to claim 1, characterized in that the at least one support ring ( 29 ) contains colorants that are added before or during the casting process. Charge air hose line according to claim 1, characterized characterized in that it is formed of elastomer. Charge air hose line according to claim 1, characterized in that the insert serving for stiffening ( 28 ) has a kevlar knit. Charge air hose line according to claim 1, characterized in that it is bellows-shaped with a plurality of wave crests ( 23 ) and troughs ( 24 ), wherein in at least one wave trough ( 23 ) a support ring ( 29 ) is arranged. Charge air hose line according to claim 1, characterized in that it by a plurality of support rings ( 29 ) is stabilized.