Hose, for example for supply of air

0001The present invention relates to a hose, z. B. a Charge air hose, with at least one fabric insert comprehensive Print carrier, said print carrier of a curable material is surrounded, and the hose end a circumferential groove owns.

0002The invention is also a method for preparing a such hose.

0003Charge air hoses are known; Charge air hoses are z. B. in Engines with turbochargers used to the air for the Ansaugemodul Motor conduct. The transported air has considerable temperatures, which is due on the one hand in the temperature of the turbocharger itself and on the other hand in the pressure increase of the charge air through the turbocharger. So are, in particular charge-air hoses (EP 826 915) are known, consisting of a AEM (ethylene acrylate monomer) exist. However, such from AEM manufactured tubes only up to about 160 ° C temperature endurance. Especially at extremely high-bred engines hoses need to Part temperatures of substantially more than 220 ° C and high Press withstand. Such temperatures and pressures are from AEM produced charge air hoses not grown.

0004From DE 44 22 557 results in the teaching, the end of a Flexible tube blank, the inside a corresponding mandrel for comprising shaping, outside aufzusetzten a molded sleeve to Elbows dimensionally stable exactly one, smooth-faced establish connection end with a comparatively low cost.

0005The prior art according to DE 197 49 332 C1 is known groove-like indentations for hose clamps by placing a appropriate tool from an elastomer material during Vulcanization of a hose made of an elastomer, eg. B. AEM to produce. A disadvantage here, however, is the low temperature resistance of such a hose, as has already been executed.

0006The invention is therefore based on the object, a tube of the above provide above-mentioned type, which is pressure and high temperatures, is easy to manufacture, and easy installation in the Motor mounting allowed.

0007The object is achieved by the fact that the Fabric insert the hose of a silicone-containing material, in particular silicone rubber or silicone rubber, is coated on both sides, wherein the tube at each end has a pre-formed sleeve, the sleeve having an imprint in the form of a circumferential groove.

0008By using a silicone based material is a Temperature resistance of up to 250 ° C is reached. It is known that in order to Fixing the charge air hoses on pipe ends hose clamps on the corresponding points are arranged. It is essential, now that Such hose clamps at a predetermined location on the tube and must rest on the pipe end to an optimal connection be able to produce between hose and pipe. It is now - as already carried out with the prior art - known, indentations in the form of circumferential grooves by a tool on an elastomer hose to install, in the grooves incarcerated hose clamps. It has however proven that this tool in the form of a from an elastomer existing, elastic ring for impressing such a circumferential groove on a silicon rubber hose, only dissolved hard after vulcanization again from silicone tubing can be, as it is the one with the silicone of the tubing Crosslinking process of the silicone rubber by vulcanization has joined. In addition, two stands, especially when using Layers of a textile fabric as a backing layer very only one small amount of silicone rubber material to inject such a Groove in the hose available. That is, it is always the Risk that the outermost fabric layer is visible through the embossing, having a negative effect on the durability and impermeability. By Use of a sleeve of silicone rubber, the quasi after Completion of the blank made of silicone rubber on the blank is turned up, such problems are avoided. Namely, a preformed sleeve of silicone rubber made in place of the tool Elastomer used, then arises the disadvantage of the above-described Hard sticking to the silicone rubber hose blank as advantage in represents, as the sleeve on the blank or on the tube by "Bonding" firmly seated, and as such may remain there. This works even when the sleeve cross-linked from finished Silicone rubber, that is silicone rubber, because the sleeve from Silicone rubber still sufficient crosslinking points for making a chemical compound with the silicone rubber of the hose blank at having the nachfolgnden vulcanization. The use of a sleeve of Silicone rubber, that is cross-linked silicone rubber, has the advantage that these does not change in size during vulcanization.

0009By using a fabric instead of a knitted fabric, can also a compressive strength can be achieved which is substantially above that with is previously known hoses achievable. This is due in particular also, therefore, that at a pressure from carrier fabric has a higher thread density can be realized than is the case for a knitted fabric.

0010To further increase the compressive strength, it is provided that the having fabric layer aramid threads.

0011Advantageously, such a tube is a skin-like barrier, particularly fluorocarbon or fluoroplastic to the hose diffusion-tight shape.

0012The use of a bell mouth has another advantage, the consists in that markings such as item numbers, Material specifications, production date or not mounting marks only later - for example, the screen printing process - on the tube must be applied, but directly in the scorching the sleeve in sameness can be introduced already, then the in turn is pushed onto the hose blank.

0013The invention is also a method for preparing a Hose, in particular a charge-air hose; such a process is characterized in that a plate-shaped basic body with a Pressure support is provided from at least one Gewebälage, said Fabric layer on both sides of a silicone-containing material (silicone rubber) is covered with the plate-shaped base body to form a tubular blank on a first mandrel, a so-called annen Auxiliary mandrel is rolled.

0014From DE 96 31 01 is known, a so-called composite order to wrap a metal mandrel, optionally dusted with soapstone can be wherein the uncured silicone rubber layer on the mandrel bears. The tube thus obtained or the hose is then vulcanized or cured. From this reference, however, is not known, the Blank, possibly after a pre-vulcanization, first from the mandrel remove these blank on one of the contour of the tube to push the corresponding second mandrel end to the blank each a prefabricated sleeve of elastomeric material applied, the Blank bandaging on the second mandrel and then to vulcanize. By bandaging it is achieved that the sleeve has a intimate connection with the hose blank during vulcanization receives. After the vulcanization, the bandage is removed and the Hose can be supplied to its intended use.

0015Advantageously, the finished sleeve of silicone rubber, by contrast, the Blank made of silicone rubber. During vulcanization then finds the Crosslinking the silicone rubber Kautsschuks to place, said sleeve from Silicone rubber still sufficient crosslinking points for a chemical having connection with the silicone rubber of the hose blank. The program supports the connection between the sleeve and the Tube blank by bandaging the hose blank with the sleeve a total of.

0016By using a plate-shaped base body with incorporated where appropriate, two in a silicone rubber layer Fabrics and their roles to form a tubular blank, a very stable and temperature-resistant hose are manufactured. Further advantageous features are disclosed in the dependent claims.

0017Reference to the drawing, the invention is exemplified below in more detail explained:<dl tsize="8"><dt>figure 1</dt><dd>shows schematically a plate made of a silicone material with a printing support layer of a woven fabric for wrapping an auxiliary mandrel;</dd><dt>figure 2</dt><dd>shows a finished blank on a contoured mandrel as schematic representation of the end side to the blank aufzusetzenden sleeves.</dd></dl>

0018According to Figure 1, the tarp 1 is made of silicone rubber with a inner support layer made of a fabric 2 as partially on a first Dorn, the so-called auxiliary mandrel 20, rolled blank 3. Here is shows that the Plane multiple superimposed -like a spiral Wrapped is such that at least two carrier layers of fabric 2 superimposed run. After the blank on the auxiliary mandrel 20 is wound, it is entdornt from Help Dorn.

0019Before the actual vulcanization of the blank according to the shaped second mandrel 10 is pushed, and then the sleeves 5 of Silicone rubber are pushed, and then the mandrel 10 on the second to be bandaged slid state (FIG. 2). The sleeves 5 show a groove-like circumferential indentation 5a for receiving the Hose clamp in the installed state of such Charge air hose in the engine. When bandaging a duly resistant and temperature-resistant tape over the entire length wound of the blank during the vulcanization an intimate bond to effect the wound layers of the blank to each other and in addition, of course, an intimate connection of the sleeves 5 from Silicone rubber with the tube blank made of silicone rubber. By Bandaging are also in the blank air bubbles forced out. After the vulcanization, the bandage is removed, and the hose blank is finished when he was pulled from the mandrel is.