Fuel Tank for Vehicles

Abstract

The invention refers to a fuel tank for a vehicle equipped with a valve housing ( 8 ) and a ventilation opening ( 11 ) that has a ventilation valve ( 6 ) placed on an upper opening of the tank and projects into the tank interior, in which case the wall of the valve housing ( 8 ) is interspersed with at least one wall opening ( 17 ), a float 19 has been arranged in the valve housing ( 8 ) that can be moved from a resting to a closing position and has a sealing element ( 21 ) on its upper end, the float ( 19 ) is in a lower place in the valve housing ( 8 ) when it is in its resting position and the sealing element ( 21 ) releases the ventilation opening ( 11 ), the float ( 19 ), when in a closing position, closes the ventilation opening ( 11 ) with its sealing element ( 21 ) as soon as the closing level ( 27 ) is reached. Furthermore, there is a connecting channel K arranged between the valve interior ( 12 ) and the tank interior ( 13 ), ending with an outlet opening ( 22 ) located below the closing level ( 27 ) in the tank interior ( 13 ), in which case the outlet opening ( 22 ) is arranged above all other wall openings ( 17 ) directly connected to the tank interior.

1 . Fuel tank for a vehicle equipped with a ventilation valve that includes a valve housing and a ventilation opening placed in an upper opening of the tank and projecting into the tank interior, in which case
 the wall of the valve housing is interspersed by at least one wall opening,   a float has been arranged in the valve housing that can be moved from a resting to a closing position and has a sealing element on its upper end,   the float is in a lower place in the valve housing when it is in its resting position and the sealing element releases the ventilation opening,   the float, when in a closing position, closes the ventilation opening with its sealing element as soon as the closing level is reached, and   a connecting channel located between the valve interior and the tank interior that ends in the tank interior with an outlet opening placed below the closing level, in which case the outlet opening has been arranged above all others directly with the wall openings connected to the tank interior.   
   
   
       2 . Fuel tank according to  claim 1  wherein the connecting channel is formed by at least an uppermost wall opening positioned above other wall openings. 
   
   
       3 . Fuel tank according to  claim 1 , wherein the connecting channel comprises a chamber arranged in the fuel tank and delimited by a wall, lying outside the valve interior that is fluidically connected to the tank interior through at least an outlet opening and to the valve interior through at least an uppermost wall opening of the valve housing positioned above other wall openings. 
   
   
       4 . Fuel tank according to  claim 3 , wherein the chamber encompasses at least part of the valve housing in its circumferential direction. 
   
   
       5 . Fuel tank according to  claim 4 , wherein the chamber has a wall section that encompasses the valve housing at least partly with a radial separation, and the lower edge of this wall section delimits the outlet opening together with the outer side of the valve housing. 
   
   
       6 . Fuel tank according to  claim 3 , wherein the chamber is formed by a dome that has an upper wall and protrudes from the upper side of the fuel tank, in which case the ventilation valve is interspersed with an opening in the wall. 
   
   
       7 . Fuel tank according to  claim 6 , wherein a second dome that has an upper wall and protrudes from its upper side that is interspersed with a opening that can be closed by a pressure-keeping valve, in which case the interior of the second dome is connected to the tank interior through an outlet opening arranged below the closing level and in this case the interior of the dome is connected with the ambient air via a nominal leakage channel whose flow cross-section is smaller than the flow cross-section of the ventilation opening of the ventilation valve. 
   
   
       8 . Fuel tank according to  claim 7 , wherein the nominal leakage channel ends in a ventilation system of the fuel tank encompassed by an activated carbon canister. 
   
   
       9 . Fuel tank according to  claim 3 , wherein a storage container placed in the tank interior is connected to an intake opening arranged below the closing level that has a connecting channel ending in the interior of the storage container, in which case a lower wall of the storage container is interspersed with an outflow opening that can be closed with a blocking valve arranged on the storage container. 
   
   
       10 . Fuel tank according to  claim 9 , wherein a blocking valve is controlled by a float. 
   
   
       11 . Fuel tank according to  claim 9 , wherein the storage container is connected to the atmosphere through a ventilation channel. 
   
   
       12 . Fuel tank according to  claim 11 , wherein the ventilation channel ends in a ventilation system of the fuel tank that is encompassed by an activated carbon canister.