Vehicular fuel tank fuel filler orifice device

Abstract

A vehicular fuel tank fuel filler orifice device that is provided with a fuel filler orifice ( 15 a ) in an upper wall ( 3 a ) of a vehicular fuel tank ( 3 ) that stores ethanol fuel as fuel for an engine and with a fuel filler guide tube ( 15 ) extending from the fuel filler orifice ( 15 a ) to the interior of the fuel tank ( 3 ), wherein the fuel filler guide tube ( 15 ) is provided with a flame arrestor ( 21 ) and a skirt ( 27 ), the flame arrestor ( 21 ) covering a lower opening of the fuel filler guide tube ( 15 ) and allowing flow of the fuel but preventing the entrance of flame, the skirt ( 27 ) extending downward from an outer peripheral part of the flame arrestor ( 21 ), and air convection between the fuel tank ( 3 ) and the fuel filler guide tube ( 15 ) occurring via the flame arrestor ( 21 ) being prevented by the skirt ( 27 ). It is thereby possible, using a flame arrestor, not only to prevent a flame from entering a fuel tank from a fuel filler orifice but also to prevent ethanol gas from moving to a fuel filler guide tube from an upper part of the interior of the fuel tank.

1 - 4 . (canceled) 
     
     
         5 . A vehicular fuel tank fuel filler orifice device that is provided with a fuel filler orifice ( 15   a ) in an upper wall ( 3   a ) of a vehicular fuel tank ( 3 ) that stores ethanol fuel as fuel for an engine and with a fuel filler guide tube ( 15 ) extending from the fuel filler orifice ( 15   a ) to the interior of the fuel tank ( 3 ),
 characterized in that the fuel filler guide tube ( 15 ) is provided with a flame arrestor ( 21 ) and a skirt ( 27 ), the flame arrestor ( 21 ) covering a lower opening of the fuel filler guide tube ( 15 ) and allowing flow of the fuel but preventing the entrance of flame, and the skirt ( 27 ) extending downward from an outer peripheral part of the flame arrestor ( 21 ), and the flame arrestor ( 21 ) is formed so as to have a hollow portion ( 21   a ) with an open upper face, and the skirt ( 27 ) is formed so as to extend to below a lower face of the flame arrestor ( 21 ).   
     
     
         6 . The vehicular fuel tank fuel filler orifice device according to  claim 5 ,
 wherein the skirt ( 27 ) is formed into a cylindrical shape so as to surround the flame arrestor ( 21 ) along the entire periphery.   
     
     
         7 . The vehicular fuel tank fuel filler orifice device according to  claim 5 ,
 wherein the axial length of the skirt ( 27 ) is set so as to be substantially twice or more the axial length of the flame arrestor ( 21 ).