Internal-combustion engines – Charge forming device – Fuel injection system
Reexamination Certificate
1999-03-05
2001-02-13
Moulis, Thomas N. (Department: 3747)
Internal-combustion engines
Charge forming device
Fuel injection system
Reexamination Certificate
active
06186119
ABSTRACT:
The invention concerns a fuel distribution device for feeding the cylinders of an internal combustion engine, in particular an engine with fuel injection at a relatively high pressure.
The invention is more particularly concerned with a new construction of a device of the above kind well able to withstand injection pressure but low in cost, easy to manufacture and easy to install.
In a fuel injected internal combustion engine the fuel distributor conventionally includes a generally tubular body connected at one axial end to the outlet of a fuel pump and having along its length a plurality of outlets in projecting bosses, these outlets being connected to the various cylinders and possibly to other devices such as a regulator, a damper, etc.
The internal orifices of the various outlets must be free of burrs and swarf. In practice this requires particularly careful finish machining of the inside wall of the distributor. The bosses are externally attached by means of shrunk-fit rings, which is a costly technique. Otherwise a costly one-piece component must be made.
A tubular body of the above kind also has a plurality of supports or fixing lugs for fixing it along the engine. The varied shapes of distributors of the above kind and the necessity to fit them at a number of points means that in practice it is necessary to design a specific model for each type of engine.
The axial ends of the tubular part are closed by screwthreaded plugs which have poor resistance to pressure.
The invention avoids all the above drawbacks.
To be more precise, the invention concerns a fuel distribution device for feeding the cylinders of a fuel-injected internal combustion engine, of the type having a hollow body with ports formed in its wall adapted to be connected, in particular, to a supply of fuel under pressure and to a plurality of injectors respectively feeding said cylinder, characterized in that said hollow body comprises at least two components welded together to define a substantially spherical cavity between them and in that each port comprises a substantially radially oriented small section hole and a larger diameter screwthreaded hole opening to the outside and connected to said small section hole.
“Port” means any connection to the distributor, whether a fuel inlet or an outlet connected to a cylinder of the engine or a connection to a regulator or damper.
The two components can be brazed or welded together. They define a substantially spherical cavity. These components can be made of steel or any other metal suitable for the required operating conditions.
In one embodiment the ports (or most of them) can be defined on a ring attached to the outside surface of one of the components.
In another embodiment at least one of the aforementioned ports is defined in an end-piece welded or otherwise attached to the outside of one or other of the aforementioned two components, the end-piece being attached in such fashion that said port communicates with the corresponding hole formed in the wall of said component.
In one embodiment the inside wall of a first of the aforementioned components forms a first spherical dome extended by a cylindrical sleeve that is open prior to assembly. A second of the aforementioned components includes a cylindrical part forming a plug engaged in said sleeve after assembly and having a cup forming a second spherical dome complementary to the first. The second component forms a mounting base on the engine and the base has an annular flange projecting externally relative to the cylindrical plug engaged in the other component. This flange is welded or brazed to a corresponding flat annular area of the first component around the opening of the sleeve.
Also, an annular cavity is formed between the two components in the vicinity of the weld area to recover particles of material resulting from the welding operation and thereby prevent intrusion of material into the interior spherical cavity.
The ports can all be in one of the components, in this instance the first component.
The internal orifices of the small section holes that discharge into the interior of the cavity can readily be deburred and burnished before welding, the inside wall of said first cavity being readily accessible to machining tools via the cylindrical sleeve.
REFERENCES:
patent: 2892453 (1959-06-01), Stoll
patent: 5109822 (1992-05-01), Martin
patent: 5186147 (1993-02-01), Bellis
patent: 38 17 413 (1988-12-01), None
patent: 196 07 521 (1997-04-01), None
patent: 266 269 (1988-05-01), None
patent: 427 977 (1991-05-01), None
Browdy and Neimark
CIDEB
Moulis Thomas N.
LandOfFree
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