the same reference numbers the flexible tube 16 is arranged on a supporting drum 21 enclosed on all sides and is likewise attached thereto at the tube mouth 19 the hollow space in the supporting drum can be used for any desired additional peripheral components of the engine the flexible tube is guided closely on all sides between the connecting flange 17 and its contact with the supporting drum so that when it is turned back it will not kink and cannot jam in the guide as already mentioned in fig1 the air intake device is coupled via a connecting flange to an internal combustion engine not shown the air intake device carries the injection nozzles for the fuel in the vicinity of the connecting flange furthermore additional elements such as air flow meters fuel distributors and the like can be disposed on or integrated with the air intake device the flexible tube 16 is fastened to the connecting flange 17 for example by an adhesive bond of course the flexible tube can also be shrunk onto the connecting flange or be welded to it fig3 a shows the guidance of a flexible tube on a supporting drum 21 which is to be seen in fig4.