Fluid sprinkling – spraying – and diffusing – Including valve means in flow line – Reciprocating
Patent
1997-04-30
1999-03-02
Kashnukiw, Andres
Fluid sprinkling, spraying, and diffusing
Including valve means in flow line
Reciprocating
2395333, 2395854, 239900, 29890124, 25112921, B05B 130
Patent
active
058759751
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a fuel injector.
BACKGROUND INFORMATION
German Patent Application No. 40 08 675 describes a conventional fuel injector including a valve needle, which in turn consists of an armature, a valve closing element, and a sleeve-shaped or tube-shaped connecting tube which connects the armature with the valve closing element, which can be spherical, for example. The parts listed represent individual parts which are manufactured separately, and which must be connected by means of joining methods which act on their substance, for example by means of laser-welding. Therefore there are at least two joints which result from the use of such joining methods. Because of the high thermal stress which occurs during methods such as welding or soldering, undesirable deformation of the valve needle can occur. The armature surrounds the connecting tube completely in the radial direction, and at least partially in the axial direction, since the connecting tube is attached in a lengthwise continuous aperture in the armature. The connecting tube itself also has an inner lengthwise continuous aperture, in which the fuel can flow in the direction of the valve closing element, and then exit close to the valve closing element, through crosswise apertures which are made in the wall of the connecting tube, and run radially.
SUMMARY OF THE INVENTION
The fuel injector according to the present invention, is advantageous in that a valve needle for the injector can be produced in particularly advantageous and cost-effective manner, with very simple and reliable connections of individual valve needle components, without the consequences of thermal stress. This is achieved, according to the present invention, by providing a rigid connection of the components which form the valve needle, such as the valve closing element and the valve needle segment, is obtained as a connecting part between the armature and the valve closing element, by using a joining method which does not act on their substance. Joining methods which are particularly suitable for this are, in particular, conventional methods such as pressing or impressing, clamping or squeezing. It is further advantageous that a secure and reliable connection of the two components of the valve needle is achieved, without the occurrence of undesirable deformation of the valve needle, as it can occur, in particular, in joining methods which act on substance, such as welding or soldering, because of the great thermal stress. A cost reduction is achieved in that the tolerances of the components can be comparatively great, since good compensation of deviations is made possible by the joining methods, because of the precise adjustment of process parameters. In addition, very high productivity can be achieved in the production of the valve needles, since production can be automated very well.
It is also advantageous to provide a cylindrical depression in the valve closing element, into which the sleeve-shaped valve needle segment is introduced. A brace element is pushed into the valve needle segment, which element is at least partly surrounded by the valve closing element. The actual pressing process, i.e., the production of the rigid connection between the valve needle segment and the valve closing element, does not take place until after the brace element has been inserted. Using a tool which can be moved into the inside channel of the valve needle segment, a pressure force which acts axially is applied to the brace element. It is particularly advantageous if a depression (indentation) is already provided on the tool engagement side of the brace element, so that slippage of the tool is precluded and the force effect acts in targeted manner. The material of the brace element is then plastically deformed in such a way that because of the good surface pressure, an optimum connection between the valve needle segment and the valve closing element is formed.
It is also advantageous to form a cylinder segment on the valve closing element, whe
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patent: 5373992 (1994-12-01), Reiter
Awarzamani Assadollah
Reiter Ferdinand
Evans Robin O.
Kashnukiw Andres
Robert & Bosch GmbH
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