Internal-combustion engines – Combustion chamber means having fuel injection only – Injection of fuel onto igniter – deflector – heater – or atomizer
Patent
1988-01-07
1989-04-18
Wolfe, Willis R.
Internal-combustion engines
Combustion chamber means having fuel injection only
Injection of fuel onto igniter, deflector, heater, or atomizer
123549, 123145A, F02M 5306, F02M 5700
Patent
active
048216968
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention is based on a device for injecting fuel. In a device of this generic type which belongs to the prior art described e.g. in the German patent application No. P 35 02 110.1, the annular shoulder on the sleeve, which firmly retains and electrically contacts the end of the glow element toward the combustion chamber, is oriented toward the injection nozzle, that is, counter to the fuel flow, so that the glow element must be inserted into the sleeve from the end of the sleeve oriented toward the injection nozzle. As a result, the contact ring washer that firmly retains and electrically contacts the end of the glow element remote from the combustion chamber cannot be fastened until after the insertion of the glow element, which under some conditions makes assembly of the parts more difficult.
ADVANTAGES OF THE INVENTION
The arrangement according to the invention has the advantage over the prior art that the glow element can be inserted into the sleeve from the face end of the sleeve oriented toward the combustion chamber, so that the contact ring washer can be fastened to the sleeve even before the insertion of the glow element and can be pre-fabricated with the sleeve into a structural unit.
Advantageous further embodiments of the arrangement according to the main claim are possible by means of the provisions recited in the dependent claims.
The insertion of the glow element into the sleeve is facilitated if the glow element, in the known manner, has an outside diameter that decreases continuously toward the injection nozzle.
By means of the constructional characteristics according to the invention, the fastening and electrical contacting of the glow element on the contact ring washer are facilitated. The greater the helical pitch of the turn adjacent to the end turn of the glow element, the larger is the angle over which the end turn can be grasped by the inner ring rim of the contact ring washer. The tongues of the contact ring washer formed on the inner ring rim, after having been deformed, firmly hold the end turn of the glow element in the prescribed position, once the glow element is joined to the contact ring washer in an ensuing operation, for instance by laser welding.
In the same advantageous manner, the end of the glow element toward the combustion chamber can be connected to the sleeve and electrically contacted if the sleeve is embodied in accordance with claim 7. The sheet-metal element, together with ceramic elements disposed on both side of the contact ring washer and serving to fasten the washer in an insulated manner, can form the sleeve, which makes manufacture easier and less expensive and also makes better use of the restricted space available than when a sleeve produced by metal-cutting techniques is used.
It is particularly advantageous if the glow element is wound from a flat strip that is cut out in the form of a spiral from a flat sheet-metal element (plate, strip) and subsequently pulled axially apart to form a conicl helix. The two contact rings on the ends are then obtained without additional labor cost. This embodiment of the glow element has the advantage that the coil can be made of a special material that is obtainable only in plate or strip form, and that flat bearing faces extending over a closed circular circumference are available on the coil, which make a secure fastening and electrical contacting substantially easier.
By the elimination of a metal support washer between the thermal insulation ring and the adjoining insulating body, the structural height of the structural assembly, comprising the sleeve, contact ring washer and the two insulating bodies, can be reduced still further.
DRAWING
Two exemplary embodiments of the invention are shown in the drawing and explained in further detail in the ensuing description. FIG. 1 shows an enlarged longitudinal section through the end toward the combustion chamber of an injection nozzle having an integrated glow insert, as a first exemplary embodiment; FIG. 2 is a plan view on the glow element of the
REFERENCES:
patent: 1693966 (1928-12-01), Sperry
patent: 1927562 (1933-09-01), Dorner et al.
patent: 1935171 (1933-11-01), Woolson
patent: 3648669 (1972-03-01), Rank
patent: 4572146 (1986-02-01), Grunwald et al.
patent: 4603667 (1986-08-01), Grunwald et al.
patent: 4627405 (1986-12-01), Imhof et al.
Eblen Ewald
Kaczynski Bernhard
Komaroff Iwan
Schmitt Alfred
Robert & Bosch GmbH
Striker Michael J.
Wolfe Willis R.
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