Internal-combustion engines – Charge forming device – With fuel pump
Reexamination Certificate
2000-04-26
2001-07-03
Moulis, Thomas N. (Department: 3747)
Internal-combustion engines
Charge forming device
With fuel pump
C123S510000
Reexamination Certificate
active
06253740
ABSTRACT:
PRIOR ART
The invention is based on a system as generically defined by the preamble to the main claim. From German Patent Disclosure DE 42 42 242, a system for supplying an internal combustion engine with fuel present in a tank is known in which a feed pump and a fuel filter are disposed along a feed segment for the fuel. Fuel supply systems for direct injection into the cylinders of an internal combustion engine require finer filtration of the fuel than conventional systems with intake-tube injection. While in systems for intake-tube injection filter pore widths of 10 &mgr;m are adequate, for direct-injection pore widths of approximately 3 &mgr;m are required.
If in an existing fuel supply system for intake-tube injection only the pore width of the filter used is reduced, the consequence is that the filter becomes stopped up in a considerably shorter time and has to be changed. For the operator of the engine, this means increased maintenance costs and downtimes.
The need by operators for a fuel filter with a long service life could be met until now only by using filters whose dimensions were increased in accordance with the reduction in their pore size. The increased space required by these filters is another disadvantage, especially in internal combustion engines for motor vehicles, where particular emphasis is placed on a compact construction.
ADVANTAGES OF THE INVENTION
The fuel supply system of the invention having the characteristics of claim
1
has the advantage over the prior art of enabling finer filtration of the fuel than previous fuel supply systems for intake-tube injection, without substantially increasing the space needed by the system or shortening the service life of the filters.
By means of the provisions recited in the dependent claims, advantageous refinements of and improvements to the fuel supply system defined by the main claim are possible.
REFERENCES:
patent: 5289810 (1994-03-01), Bauer et al.
patent: 5330475 (1994-07-01), Woodward et al.
patent: 5415146 (1995-05-01), Tuckey
patent: 5636616 (1997-06-01), Okane et al.
patent: 5762048 (1998-06-01), Yonekawa
patent: 5782223 (1998-07-01), Yamashita et al.
patent: 5785032 (1998-07-01), Yamashita et al.
patent: 42 42 242 A1 (1994-06-01), None
Moulis Thomas N.
Robert & Bosch GmbH
Striker Michael J.
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