Sealing system for fill pipe head and associated pipe

Abstract

Sealing system for fuel tank fill head comprising: a shutter that can be moved between an open position, in which fuel may be introduced into the fill pipe, and a closed position in which the fill pipe is closed, the shutter passing from one position to the other under the effect of a thrust exerted by a filling nozzle head; a shield placed upstream of the shutter and that can be moved between an open position, in which the shutter is accessible, and a closed position in which the shutter is protected from the atmosphere by the shield; and a nozzle inhibitor comprising components that can be rotated with respect to an axis of rotation substantially parallel to the longitudinal axis of the fill head and designed so as to enable a movement of the shutter from its closed position to its open position when the mobile components have been moved under the effect of a thrust exerted by the filling nozzle head having a predefined diameter on the mobile components. The invention also relates to a fill pipe equipped with such a sealing system.

1 . A sealing system for fuel tank fill head comprising:
 a shutter that can be moved between an open position, in which fuel may be introduced into a fill pipe, and a closed position in which the fill pipe is closed, the shutter passing from one position to the other under the effect of a thrust exerted by a filling nozzle head;   a shield ( 5 ) placed upstream of the shutter and that can be moved between an open position, in which the shutter is accessible, and a closed position in which the shutter is protected from the atmosphere by the shield ( 5 ); and   a nozzle inhibitor comprising components that can be rotated with respect to an axis of rotation substantially parallel to the longitudinal axis of the fill head and designed so as to enable a movement of the shutter from its closed position to its open position when the mobile components have been moved under the effect of a thrust exerted by the filling nozzle head having a predefined diameter on the mobile components.   
   
   
       2 . The sealing system according to the preceding claim, wherein the nozzle inhibitor is prestressed in its closed position by elastic return means ( 15 ,  16 ,  17 ). 
   
   
       3 . The sealing system according to  claim 1 , wherein the shield ( 5 ) is prestressed in its open position by elastic return means ( 19 ). 
   
   
       4 . The sealing system according to  claim 1 , wherein the nozzle inhibitor comprises 3 mobile components ( 7 ,  10 ,  13 ). 
   
   
       5 . The sealing system according to the preceding claim, wherein the 3 mobile components ( 7 ,  10 ,  13 ) each have at least one spherical surface portion capable of coming into contact with the filling nozzle head. 
   
   
       6 . The sealing system according to  claim 4 , wherein the shield ( 5 ) comprises stops ( 9 ,  12 ,  12 ′) on the face oriented towards the mobile components ( 7 ,  10 ,  13 ) and each mobile component ( 7 ,  10 ,  13 ) has a raised finger ( 8 ,  11 ,  14 ) capable of cooperating with one of said stops ( 9 ,  12 ,  12 ′) so as to keep the shield ( 5 ) in its closed position. 
   
   
       7 . The sealing system according to the preceding claim, wherein the shield ( 5 ) is capable of passing from its closed position to its open position when the stops ( 9 ,  12 ,  12 ′) are released from contact with the fingers ( 8 ,  11 ,  14 ) of the mobile components ( 7 ,  10 ,  13 ) under the effect of the thrust exerted by the filling nozzle head of predefined diameter on the spherical surface portions of the 3 mobile parts ( 7 ,  10 ,  13 ). 
   
   
       8 . The sealing system according to  claim 4 , wherein it moreover comprises a locking cam ( 20 ) positioned between the shield ( 5 ) and the nozzle inhibitor and capable of locking the movement of the shield ( 5 ). 
   
   
       9 . The sealing system according to  claim 8 , wherein the locking cam ( 20 ) is capable of being entrained by the mobile components ( 7 ,  10 ,  13 ) of the nozzle inhibitor so as to enable movement of the shield ( 5 ). 
   
   
       10 . A fill pipe for fuel tank equipped with a sealing system according to  claim 1 .