| 摘要 |
<p>The fuel tank filling tubes have a tubular body with an upper end communicating with the atmosphere onto which is coupled an inlet piece integrating a removable sealed plug and valvular parts. At the lower end is a non return valve coupled to the inlet mouth (4) of the tank (3). The filling tube body is made from two thermoplastic material pieces. These comprise a first sinuous long piece (1), obtained by blowing, which includes the upper end, and a second moulded piece (2), which takes the lower end. The two pieces are welded together. The second piece, obtained by injection moulding, has a long portion (2a) with a completely smooth external surface. The first piece has fuel tank ventilation pipes (11,12) fixed to it. The widened end (2b) of the second piece joins to the first piece from which leave, at two diametrically opposite points, two appendices, obtained in the same moulding operation. These terminate in two discs from which issue the nozzles connecting to the ends of the ventilation tubes. The moulded lower section, coupled to tank inlet mouth, avoids the possibility of plastic shavings, obtained by thinning a blown section, entering the tank.</p> |
