Internal-combustion engines – Charge forming device – With fuel pump
Reexamination Certificate
2002-11-18
2004-05-25
Moulis, Thomas N. (Department: 3747)
Internal-combustion engines
Charge forming device
With fuel pump
C123S510000, C220S562000, C220S004140
Reexamination Certificate
active
06739319
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention is based on a fuel supply device of an internal combustion engine with a fuel filter, and particularly to such device including a closure element closing an opening in a fuel tank and having a cup-shaped receptacle containing the fuel filter.
2. Description of the Prior Art
EP 0 612 919 A1 has disclosed a fuel supply device having a closure element, which closes an opening of a fuel tank and which has a cup-shaped receptacle into which the fuel filter is inserted. The receptacle can be closed from the outside of the fuel tank by means of a cover element, which can be detachably fastened to the closure element. An elastic sealing ring is clamped between the cover element and the closure element and seals the receptacle. Fuel, which is supplied to the internal combustion engine under pressure by a delivery unit, flows through the fuel filter. The pressure in the delivery system is usually maintained even when the delivery unit is not running; this pressure also prevails in the fuel filter receptacle. When the fuel filter is replaced, for which the cover element is detached from the closure element, pressurized fuel can escape, which is a danger to the person who is replacing the filter and also represents a fire hazard.
SUMMARY OF THE INVENTION
The fuel supply device according to the invention has the advantage over the prior art that when the cover element is detached from the closure element, the sealing ring unblocks the at least one opening connecting the receptacle to the interior of the fuel tank, which produces a pressure relief into the fuel tank so that no pressurized fuel escapes from the receptacle. There is therefore no danger to the person who is replacing the filter and no fire hazard.
REFERENCES:
patent: 5782223 (1998-07-01), Yamashita et al.
patent: 6332555 (2001-12-01), Stangier
patent: 6405753 (2002-06-01), Beyer et al.
patent: 2001/0050104 (2001-12-01), Nishi et al.
patent: 0 612 919 (1994-08-01), None
patent: 0 861 682 (1998-09-01), None
Ast Christian
Braun Hans-Peter
Franieck Erwin
Wieland Thomas
Woerz Stefan
Greigg Ronald E.
Moulis Thomas N.
Robert & Bosch GmbH
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