Internal-combustion engines – Combustion chamber means having fuel injection only – Combination igniting means and injector
Patent
1988-01-07
1988-12-06
Dolinar, Andrew M.
Internal-combustion engines
Combustion chamber means having fuel injection only
Combination igniting means and injector
123549, 123145A, 239133, F02M 5306
Patent
active
047889535
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a device for injecting fuel into a combustion chamber of an internal combustion engine. In devices of this type, the cross section of the annular chamber surrounding the flow element increases toward the injection nozzle, resulting in an overall improvement in the flow conditions for the aspirated air.
If the glow element furthermore has a wall thickness that remains constant over the entire length, then its inner passageway also adapts better to the shape of the injection stream, as a result of which injector effect of the injection streams passing through the glow element is also intrinsically increased. In the version described in applicant German patent Application the electrical contacting of which requires increased time and effort, because of the lack of flat contact faces on the round wire.
SUMMARY OF THE INVENTION
It is an object of this invention to provide an improved arrangement for the fuel injection for internal combustion engines.
The arrangement according to the invention has the advantage over the prior art that with relatively little time and effort, reliable electrical contacting and retention of the glow element are possible. As material for the glow element, it is also possible to use special materials of the kind that are obtainable only as flat material, in the form of plates and strips. With equally large interstices between turns and therefore an equally good admixture of aspirated air in the peripheral zones of the injection streams passing through the glow element, the moment of resistance to flow factors is increased in comparison with heating coils made from round wire. The glow element can be manufactured in a cost-effective manner using sheet-metal plates or strips available in commerce.
The shape of the flat strip forming the glow element can be obtained extremely accurately if the flat strip is a shaped element cut by laser or by etching.
A particularly reliable contacting of the glow element can be attained if one closed contact ring each is formed onto the ends of the flat strip forming the glow element. In that case, the contact rings can at the same time advantageously act as a means of centering and fastening the glow element on a holder; the holder can for instance be embodied as a sleeve supported on the nozzle adjusting nut and surrounding the glow element with radial play.
The novel features which are considered as characteristic for the invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows an enlarged longitudinal section taken through the end toward the combustion chamber of an injection nozzle and a glow insert integrated with the clamping nut of the nozzle; and FIG. 2 shows a plan view on the glow element of the glow insert of FIG. 1 in an intermediate stage in manufacture.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The device includes an injection nozzle having a nozzle body 10, in which in a known manner a valve seat is formed and a valve needle is displaceably supported. The nozzle body 10 and an intermediate washer that limits the stroke of the valve needle are fastened by means of a clamping nut 12 to a nozzle holder, in which among other elements, a closing spring that presses the valve needle against the valve seat is accommodated. On the end face at the side of the combustion chamber, the nozzle body 10 is provided with a conical wall portion 14, which merges into a flat end wall 16.
The clamping nut 12 is extended beyond the nozzle holder 10 toward the combustion chamber, and downstream from its end wall 16 is provided with an inner support shoulder 18, on which a glow insert identified overall by reference numeral 20 rests. This glow insert has as a centr
REFERENCES:
patent: 1456018 (1923-05-01), Wiegand
patent: 2066860 (1937-01-01), Shumake
patent: 4604975 (1986-08-01), Frey et al.
patent: 4627405 (1986-12-01), Imhof et al.
Patent Abstracts of Japan, vol. 7, No. 169 (M-231)(1314), Jul. 26, 1983 & JP, A, 58-74868, May 6, 1983.
Kaczynski Bernhard
Komaroff Iwan
Dolinar Andrew M.
Robert & Bosch GmbH
Striker Michael J.
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