Patent Publication Number: US-2013248048-A1

Title: Insert for a Filler Neck of a Urea Container

Description:
The invention relates to an insert for a filler neck of a urea container in diesel-fueled motor vehicles, preferably trucks, as defined by the preamble to claim  1 . 
     To ensure that urea cannot be fed into fuel tanks, feed nozzles for urea are equipped with a safety valve, which is unlocked via a ring magnet in the filler neck. This arrangement has stood the test of time in trucks. 
     For reducing the cost of such filler necks, which are solidly connected to the urea container, it is the object of the present invention to create an insert that is suitable for being retroactively built into the filler neck and both has a simple structure and is quick to install. 
     For attaining this object, in an insert of this type for a filler neck of a urea container, the features recited in claim  1  are provided. 
     By the provisions of the invention, it is attained that the insert can be assembled together with the permanent magnet, which is magnetized before installation, quickly and easily, since a magnetizing device, required during assembly, need not be kept on hand and used. Moreover, because the two plastic components are welded together, further seals, for instance in the form of ring seals are the like, are unnecessary. This leads to further simplifications and economies. 
     If in a further embodiment of the present invention the features of claim  2  are provided, this makes it possible to monitor the tightness of the space between the two plastic components, in which space the permanent magnet is received. 
     Further advantageous embodiments will become apparent from the features of one or more of claims  3 - 6 . 
     A preferred embodiment of the insert with regard to its disposition in a filler neck will become apparent from the features of claim  7 . 
    
    
     
       Further details of the invention can be learned form the ensuing description, in which the invention is described and explained in further detail in terms of the exemplary embodiment shown in the drawing. 
         FIG. 1 , in an exploded perspective view, shows an insert for a filler neck of a urea container in a preferred exemplary embodiment of the present invention; and 
         FIG. 2  is a longitudinal section through the insert of  FIG. 1 , in the assembled state. 
     
    
    
     For filling a urea container, not shown, the insert  10  shown in the drawing is inserted into the filler neck of the urea container, so that with the aid of a feed nozzle for urea, the urea container can be filled without causing fuel to be mistakenly fed in as well. 
     The insert  10  comprises three parts, namely two plastic components  11  and  12  and one permanent magnet  13 . 
     One plastic component  11  is a graduated cylindrical receiving element which can be indirectly clipped or introduced in bayonet fashion into the filler neck, not shown. The receiving element  11  is graduated multiple times on the outer and inner circumference, and on its front end, in terms of the direction indicated by the arrow A, it has a crownlike part  16  with circumferentially distributed indentations  17 , an adjoining graduated receiving region  18 , and adjoining that, a cylindrical region  19  of smaller diameter that is provided with an annular groove  21  on its outer circumference. The receiving element  11  is embodied in one piece. 
     The second plastic component  12  forms an inner guide element, which is formed in one piece of an axially extending tubular part  26  and, extending horizontally perpendicular to it, a radially extending annular rim  27 , which in turn is provided on its outer circumference, axially in the direction of the arrow A and parallel to the tubular part  26 , with a crimped edge  28 . At the transition from the tubular part  26 , which serves as an axial boundary wall with respect to the annular rim  27  that in turn serves as a radial covering wall, the encompassing inner edge  29  is embodied in polygonal or rounded fashion. The inside diameter of the tubular part  26  is equivalent to that of the cylindrical region  19  of the receiving element  11 . 
     The permanent magnet  13 , which in the exemplary embodiment is embodied annularly, comprises a magnetic material, such as NdFeB, and is magnetized before the insert  10  is installed. The permanent magnet, which is delivered in the magnetized state, is received between the two plastic components  11  and  12 . 
     In  FIG. 2 , the inner guide element  12 , by its free annular end of the crimped edge  28 , and by the lower annular end of the cylindrical region  19 , respectively, is set onto an upper first annular graduated face  31  and a lower second annular graduated face  32  of a setback  30  of the receiving element  11 . The permanent magnet  13 , delivered in the magnetized state, is located then in a chamber  33  between the inner guide element  12  and the receiving element  11 . At a lower end, in terms of the direction of the arrow A, of the receiving chamber  33 , in which the permanent magnet  13  is received between the two plastic components  11  and  12 , there is a remaining an air space  34 , which is not filled by the permanent magnet  13 . In other words, the axial length of the permanent magnet  13  is somewhat less than the axial dimension of the receiving chamber  33  between the two plastic components  11  and  12 . Otherwise, the cross section of the permanent magnet  13  is equivalent to the cross section of the chamber  33 , minus the air space  34 . 
     In this state, the two plastic components  11  and  12  are welded ultrasonically in gas- and fluid-tight fashion at their contacting annular faces. After the ultrasonic welding of the two plastic components  11  and  12 , the remaining space  34  remains filled with air, by way of the internal pressure of which the tightness of the ultrasonic welding can be monitored.