| 主权项 |
1. A vehicle fuel filler tube assembly comprising:
a fuel filler tube having an outer surface, a fuel receiving end and a fuel tank attachment end opposite the fuel receiving end, the fuel filler tube having a cylindrical shape proximate the fuel receiving end; a cap protector having a first surface defining a fuel filler compartment and a second surface opposite the first surface outside of the fuel filler compartment, the cap protector defining an upper tube receiving opening that extends from the first surface to the second surface with the fuel filler tube extending therethrough, the cap protector defining an upper vent inlet opening that extends from the first surface to the second surface at a location spaced apart from the upper tube receiving opening; a collar circumscribing the fuel receiving end of the fuel filler tube, the collar comprising: an end wall having an inner surface and an outer surface with a tube receiving surface extending from the inner surface to the outer surface and defining a lower tube receiving opening having a first diameter, the fuel filler tube extending through the lower tube receiving opening with the tube receiving surface contacting the outer surface of the fuel filler tube; and a side wall extending from the end wall, the side wall having a first end that is contiguous with the end wall and a second end opposite the end wall, the side wall having an inner collar surface and an outer collar surface that both have an arcuate contour defining a cylindrical shape, the second end having a flat arcuate end surface that contacts the second surface of the cap protector, the side wall and the outer surface of the fuel filler tube defining a gap therebetween at the second end, the gap further defining a lower vent inlet opening, the lower vent inlet opening having a second diameter defined by the inner collar surface at the second end, the second diameter being larger than the first diameter, the flat arcuate end surface of the second end of the side wall encircling the upper vent inlet opening and the upper tube receiving opening, the side wall further defining a chamber opening spaced apart from the second end that extends from the inner collar surface to the outer collar surface, the inner collar surface including a plurality of first ribs and a plurality of second ribs that protrude in a radially inward directions and extend along the arcuate contours of the inner collar surface, the plurality of first ribs being parallel to one another, at least one of the plurality of second ribs extending between a first one of the plurality of first ribs to a second one of the plurality of first ribs, such that the plurality of first ribs, the plurality of second ribs, the lower vent inlet opening and the outer surface of the fuel filler tube define a non-linear labyrinth path between the upper vent inlet opening and the chamber opening. |
