Internal-combustion engines – Combustion chamber means having fuel injection only – Combination igniting means and injector
Patent
1988-09-14
1990-05-22
Nelli, Raymond A.
Internal-combustion engines
Combustion chamber means having fuel injection only
Combination igniting means and injector
123145A, F02M 5306, F02B 908
Patent
active
049268198
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF INVENTION
This invention relates to fuel injection systems and more particularly to an improved system for injecting fuel into the combustion chambers of an internal combustion engine.
In fuel injection systems of the known type current lead is guided to a contact ring body and connected with the latter, while a sleeve, which encloses the glow coil and supports its end at a combustion chamber side, is connected with a cap nut of a injection nozzle so as to be electrically conductive and forms a part of a ground conductor. In this construction, a contact ring body is insulated relative to the sleeve and relative to a heat protection ring, for which purpose two ceramic rings and another metallic ring body are provided, the heat protection ring being supported at the latter.
SUMMARY OF INVENTION
The invention is directed to a system for injecting fuel into the combustion chambers of an internal combustion engine, comprising, in combination: a nozzle body having a front side, a glow coil having two ends, a sleeve enclosing the glow coil at a radial distance therefrom, the sleeve having at least one aeration opening leading into the annular space between the sleeve and the glow coil, allowing air to enter the boundary zones of the injection jets from the combustion chamber by means of injection action, a contact ring body for mounting the glow coil and sleeve downstream from the front end of the nozzle body, one end of the glow coil making contact with and being supported at the sleeve and the other end of the glow coil being in electrical connection with the contact ring body, means for electrically insulating the sleeve from the contact ring body, an axially springing heat protection ring interposed between the contact ring body and the front side of the nozzle body and a current lead extending along the nozzle body and making electrical connection with the sleeve, the arrangement being such that the sleeve and contact ring body provide a conductive path for carrying current through the glow coil from the current lead.
The fuel injection system according to the invention has the advantage that the need for an insulation of the contact ring body relative to the heat protection ring is dispensed with and the latter can be supported directly at the contact ring body. Accordingly, the assembly of the glow attachment can be facilitated in many cases.
Advantageous developments of the fuel injector system according to the invention are possible which simplify its construction and assembly.
In devices in which the nozzle body is clamped at a nozzle holder by means of a cap nut, simple constructions of the sleeve and contact ring body result when the contact ring body is fastened at the front end of the cap nut at the combustion chamber side and the current lead is guided through the contact ring body so as to be insulated.
A disk, which is at least substantially flat, can serve as a contact ring body when the sleeve is provided with an annular rim which projects radially over the contact ring body, is fastened at the front end of the cap nut on the combustion chamber side so as to be electrically insulated, and which is connected with the current lead.
The contacting of the sleeve can be facilitated and simplified if its annular rim overlaps the nozzle body by a distance with play. In this case, it can be advisable to introduce the annular rim into an expanded bore hole portion of the cap nut, a transverse bore hole of the cap nut, which facilitates the contacting with the current lead, opening into this expanded bore hole portion. The sleeve or its annular rim, respectively, then forms a part of the cap nut to a certain extent, which can be constructed so as to be correspondingly shorter than in the conventional constructions.
If the annular rim is provided with an external annular shoulder for the purpose of support at an inner shoulder in the housing bore hole receiving the parts, which annular shoulder faces away from the cap nut, a fastening of the sleeve at the cap nut can, under certain circu
REFERENCES:
patent: 2628600 (1953-02-01), Malin
patent: 3996915 (1976-12-01), Demetrascu
patent: 4603667 (1986-08-01), Grunwald et al.
patent: 4604975 (1986-08-01), Fray et al.
patent: 4766801 (1988-08-01), Finstarwalder
patent: 4788953 (1988-12-01), Kacqynski et al.
patent: 4821696 (1989-04-01), Kaczynski et al.
Auwarter Gerhard
Imhof Ernst
Kaczynski Bernhard
Komaroff Iwan
Reum Helmut
Nelli Raymond A.
Robert & Bosch GmbH
Striker Michael J.
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