Fluid sprinkling – spraying – and diffusing – Fluid pressure responsive discharge modifier* or flow... – Fuel injector or burner
Patent
1992-07-27
1993-09-14
Kashnikow, Andres
Fluid sprinkling, spraying, and diffusing
Fluid pressure responsive discharge modifier* or flow...
Fuel injector or burner
2395339, 403340, F02M 4508, F02M 6120
Patent
active
052441520
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a fuel injection valve for internal combustion engines.
More particularly, it relates to a fuel injection nozzle with a nozzle body which supports a valve needle and with a nozzle holder connected with the nozzle body and containing a spring chamber for receiving two closing springs acting on the valve needle one after the other.
Such fuel injection valves are known in the art.
In an injection nozzle of this generic type (DE-OS 36 10 658), the spring chamber in the nozzle holder receives the two closing springs which are arranged one after the other in the axial direction. The closing spring lying closer to the valve needle is supported via a disk at an annular shoulder of the spring chamber so that the chamber is divided into a region with a large diameter and a region with a small diameter. As a result, the small diameter is no longer sufficient for receiving a suitable spring in a conventional standard outer diameter of the nozzle holder of e.g. 17 mm.
To prevent an increase in the outer diameter in injection nozzles of the generic type compared to commercially available constructions it is suggested in the German Patent Application P 38 39 038 to construct the spring chamber serving to receive the two closing springs in the nozzle holder with the same diameter along the entire length and to support the closing spring adjacent to the valve needle at a cross-pin penetrating the spring chamber. In this construction the two closing springs can have the same diameter but the transverse bore hole for the cross-pin in the housing of the nozzle holder impairs its strength and tightness.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a fuel injection valve which avoids the disadvantages of the prior art.
In keeping with these objects and with others which will become apparent hereinafter, one feature of the present invention resides, briefly stated, in a fuel injection valve in which the second closing spring is supported at a base of the spring chamber via a second thrust pin which penetrates the first closing pin and is arranged coaxially to a first thrust pin which penetrates the second closing spring and the ends of the two thrust pins which face each other carry heads with fingers which engage through one another and on which the closing springs are supported.
When the fuel injection valve is designed in accordance with the present invention, it has the advantage over the prior art that the housing of the two-spring nozzle holder can be constructed with the conventional standard outer diameter of e.g. 17 mm. Further, the spring chamber has a constant diameter along its entire length which can be kept relatively small. Moreover the mounting of the closing springs and thrust pins is very simple.
In accordance with another feature of the present invention a simple and automated fabrication of the claw-like fingers is made possible when the latter have an annular segment-shaped cross section which is identical in the fingers of both heads. The adjustment of the opening pressure of the injection nozzle is particularly simple when the thrust pin in the vicinity of the valve needle is constructed in two parts as a smooth pin with a separate head part.
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 injection nozzle for a diesel engine in longitudinal section;
FIG. 2 shows two thrust pins of the injection nozzle according to FIG. 1 in an exploded view and
FIG. 3 shows a thrust pin in accordance with another embodiment.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The injection nozzle has a nozzle body 10
REFERENCES:
patent: 2470282 (1949-05-01), Baker et al.
patent: 4527986 (1985-07-01), Bridgewater et al.
patent: 4768719 (1988-09-01), Straubel et al.
patent: 4852808 (1989-08-01), Yamamoto
patent: 4962890 (1990-10-01), Shindo et al.
patent: 5161742 (1992-11-01), Hofmann et al.
patent: 5165607 (1992-11-01), Stevens
Patent Abstracts of Japan, vol. 9 No. 25 (M-355) (1748), Feb. 2, 1985.
Kashnikow Andres
Merritt Karen B.
Robert & Bosch GmbH
Striker Michael J.
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