Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1999-03-31
2000-09-12
Moulis, Thomas N.
Internal-combustion engines
Charge forming device
Fuel injection system
F02M 5502
Patent
active
061162191
DESCRIPTION:
BRIEF SUMMARY
This invention is about a device to affix a fuel injector on the cylinder head of an internal combustion engine.
More particularly, the invention describes a device for an injector that goes through, nearly vertically, the cylinder head and exits it on an interior surface that covers the supposedly vertical cylinder of the engine, and exits it on an accessible exterior surface.
In an implementation known in patent DE43 15 233, the affixing device is integrated in the cylinder head, in a chamber that contains the mechanical elements that actuate the valves, and contains a cylindrical sleeve that surrounds the body of the injector.
This latter possesses, along its central section located in the chamber, a peripheral groove able to receive a trim on which the sleeve comes to rest on the bottom with the aid of an interior shoulder to immobilize the injector against the lower bottom of a housing designed in the cylinder head, generally called injector well.
The sleeve extends toward the bottom from the shoulder forming a recess that comes to tighten a protruding section of the cylinder head with interposition of circular seal inserted in order to protect the body of the injector from the oil cloud in the chamber. Between the top section of the sleeve and a cover of the cylinder head delimiting the chamber is set a lipped gasket to insure the seal between the chamber and the outside of the cylinder head.
The sleeve is attached in the cylinder head by a fork that rests on two exterior transversal wings of the sleeve under the pressure of a threaded part screwed in the cylinder head.
Such a device congests the chamber by reducing the space available for the valves and requires relatively costly seals; furthermore, the disassembly of the fuel injector is difficult and a precarious balance above its attachment is detrimental to its reliability.
It is this invention's aim to show a device of the type described below that remedies the problems mentioned above.
In effect, the invention is about a device for affixing a fuel injector to an internal combustion engine cylinder head that consists of a bottom part designed to cover an engine cylinder and a top part, which defines with the other part a chamber that contains mechanical valve actuators. The injector passes through these two parts and is supported at the base of a well of the bottom part by a flange attached to the cylinder head with screws, and by means of a tubular piece that enclosed the body of the injector and rests on the protruding section of a trim ring mounted in a peripheral groove in the injector body, characterized in that the flange is rigidly integrated with the tubular piece, made of a sleeve, which is inserted in a cylindrical hollow of the top part.
According to a few interesting designs of the invention: inserted and of a peripheral groove in which is mounted a sealing gasket. designed to seal the body of the injector to the bore of the sleeve when said sleeve comes to rest against the trim under the pressure of the flange that is attached to the head gasket. edges designed to insure the contact of the trim's extremities.
The characteristics of the invention mentioned above, as well as others, will appear more clearly during the reading of the following description of an implementation example, referring to the drawings in the appendix on which:
FIG. 1 is a partial, longitudinal cut view of the invention's device to affix a fuel injector on the head cylinder of an internal combustion engine;
FIG. 2 is a partial cut view that follows line II--II in FIG. 1;
FIG. 3 is a perspective view of the injector and of a part of the affixing device;
FIG. 4 shows a perspective view of a flange of the device;
FIG. 5 is a top view of a trim of the device;
FIG. 6 is a cut view, to a greater scale, following line VI--VI of FIG. 4
We can see, on FIGS. 1 and 2, a fuel injector 1 passing through a head cylinder 2 of a internal combustion engine and maintained on it by an attachment device D.
The head cylinder 2 contains on one hand a section called the bottom part
REFERENCES:
patent: 4133321 (1979-01-01), Hofmann et al.
patent: 4203402 (1980-05-01), Freyn
patent: 4528959 (1985-07-01), Hauser, Jr.
patent: 4589596 (1986-05-01), Stumpp et al.
patent: 6009856 (2000-01-01), Smith, III et al.
Automobiles Citroen
Automobiles Peugeot
Moulis Thomas N.
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