Fluid sprinkling – spraying – and diffusing – With means to vibrate or jiggle discharge
Reexamination Certificate
2001-06-15
2002-11-05
Evans, Robin O. (Department: 3752)
Fluid sprinkling, spraying, and diffusing
With means to vibrate or jiggle discharge
C239S102200, C239S533200, C239S584000, C239S585100, C239S533700
Reexamination Certificate
active
06474565
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention is based on a fuel injector according to the species defined in the Main Claim.
A fuel injector of the type set forth in the Main claim is known from the German Patent 40 05 455 A1.
The fuel injector derived from this document has a piezoelectric actuator and a valve-closure member that is operable by a valve needle and cooperates with a valve-seat surface to form a sealing seat. The actuator is arranged on the end of the fuel injector facing away from the spray-discharge side, and is sealed off by a spring diaphragm, extending over the cross-section of the fuel injector, from a fuel introduced laterally and in the spray-discharge direction below the spring diaphragm. The spring diaphragm therefore divides the fuel injector into a section on the spray-discharge side filled with fuel, and a section, sealed off from the fuel, in which the actuator is located. The sealed-off section of the fuel injector has an electrical connection via which an electrical supply line is run to the actuator. The electrical connection is inserted into a bore hole placed laterally on the valve housing of the fuel injector.
Disadvantageous in the fuel injector known from DE 40 05 455 A1 is that the fuel can only be introduced into the fuel injector via a fuel-inlet connection mounted laterally on the valve housing and disposed below the spring diaphragm in the spray-discharge direction. In particular, the fuel cannot be introduced into the fuel injector via the end of the valve housing opposite the spray-discharge side. Both the length and the diameter of the fuel injector are increased due to the disadvantageous position of the fuel-inlet connection.
Another disadvantage is that the actuator is not protected from substances such as leak oil and leak fuel penetrating via the separating line between the valve housing and the electrical connection. In addition, the joining of the electrical connection to an electrical contact of the actuator takes too much effort, since the actuator is introduced into the valve housing via an opening at the extremity, and the electrical connections are guided laterally to the actuator.
ADVANTAGES OF THE INVENTION
In contrast, the fuel injector of the present invention having the characterizing features of the Main Claim has the advantage that the actuator is completely sealed off, this sealing being suitable for any fuel injectors, and in addition, an electrical supply line of the actuator can be connected in a simple manner to an electrical connection.
Measures specified in the dependent claims permit advantageous further developments of the fuel injector indicated in the Main Claim.
The electrical supply line is advantageously constructed as a contact tag forming an angle at the actuator. A reliable electrical contacting at the actuator is achieved in this manner, it being possible for an electrical connection to be provided by the electrical supply line at the same time.
It is advantageous that the filler element is a cured filling compound or a flexible solid. The filler element can thereby be introduced in a simple manner into the feed-through opening, it adapting to the particular shape of the feed-through opening.
It is also advantageous that the fuel injector has a plastic casing which covers the filler element of the feed-through opening. This provides a further protection for the feed-through opening and the filler element filling the feed-through opening, particularly against mechanical stress, it being possible for the plastic casing, together with the electrical supply line, to form an electrical connection.
It is an advantage that a space formed between the valve housing and the actuator housing tapers continuously in the edge area of the feed-through opening toward said feed-through opening. The valve housing and the actuator housing are thereby bent toward each other, the cut-outs of the valve housing and of the actuator housing directly adjoining each other, thus simplifying the sealing from the standpoint of production engineering.
Another advantage is that, to secure the armature housing to the valve housing, a space formed between the valve housing and the actuator housing tapers continuously in a region of a further cut-out of the valve housing. In this manner, the valve housing abuts against the actuator housing, thereby achieving a stabilizing contact of the actuator housing against the valve housing, which means an easily implemented mounting of the actuator in the fuel injector is yielded by securing the actuator housing to the valve housing. In this context, it is in turn particularly advantageous if the valve housing has an inwardly bent lateral surface for forming the continuously tapering space in the region of at least one cut-out of the valve housing.
The valve housing is advantageously joined to the actuator housing at at least one cut-out of the valve housing by a circumferential welded seam. This yields a reliable, integral joining with form locking which permits a seal and attachment that is resistant to ageing and exhibits long-term stability.
REFERENCES:
patent: 3194162 (1965-07-01), Williams
patent: 4553059 (1985-11-01), Sakakibara et al.
patent: 4725002 (1988-02-01), Trachte
patent: 6196472 (2001-03-01), Cooke
patent: 6213414 (2001-04-01), Stier et al.
patent: 40 05 455 (1990-08-01), None
patent: 2 094 940 (1982-09-01), None
Boee Matthias
Hohl Guenther
Keim Norbert
Ruehle Wolfgang
Stier Hubert
Evans Robin O.
Kenyon & Kenyon
Robert & Bosch GmbH
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