Fluid sprinkling – spraying – and diffusing – Including valve means in flow line – Reciprocating
Reexamination Certificate
2000-04-05
2001-08-28
Scherbel, David A. (Department: 3752)
Fluid sprinkling, spraying, and diffusing
Including valve means in flow line
Reciprocating
C239S533900, C239S900000, C251S129210, C267S181000, C137S625650
Reexamination Certificate
active
06279841
ABSTRACT:
BACKGROUND OF THE INVENTION
German Patent No. 40 03 227 describes a fuel injector which, as a valve which can be actuated electromagnetically, is provided with a magnetic circuit and a seat valve. In this valve, a fuel filter intended to keep dirt particles away from the seat region is pressed into a core at its feed end, the core serving as a fuel inlet connection. Moreover, an adjusting sleeve and a helical return spring are also arranged in the longitudinal opening of the core. The pressed-in adjusting sleeve is used to adjust the spring bias of the return spring engaged on it which is braced against the valve needle with its downstream end, pressing the valve-closure member against a valve seat in the closing direction of the valve when the magnetic coil is not excited. Thus, several component parts are fastened in the fuel inlet connection, possibly in a chip-forming manner.
Moreover, it is known from German Patent No. 41 40 070, German Patent No. 196 38 201, or from PCT Patent Publication No. WO 93/18299 to arrange filter elements in fuel injectors near the valve seat.
SUMMARY OF THE INVENTION
The fuel injector according to the present invention has the advantage that it can have a particularly small and compact design. To that end, according to the present invention, a spring element joins the valve-closure member to the valve-seat body.
By using such a spring element, it is possible to substitute a return spring which is arranged in the fuel inlet connection in known fuel injectors and always requires an additional adjusting element, both component parts together mostly being responsible for a longer design of the fuel injector. Besides, the outlay of component parts can be reduced in this manner.
It is an additional advantage that there is no need to provide an exact guide opening in the valve-seat body for guiding the valve needle or the valve-closure member during its axial motion since the valve-closure member is guided and pulled exactly into the valve-seat body by the spring element.
It is particularly advantageous for the spring element to be designed as a diaphragm spring having the form of a sleeve as well as two fastening regions partially enclosing the valve-closure member and the valve-seat body.
Also, it is particularly beneficial for the spring element to be designed as a filter element at the same time. The diaphragm spring provided with a plurality of holes allows particles impairing the tightness of the valve to be filtered out from the fuel near the valve seat. By using such a diaphragm spring having spring and filter functions, it is possible to substitute both a fuel filter arranged in the fuel inlet connection in known fuel injectors and the return spring as well as the adjusting sleeve mostly following downstream in the fuel inlet connection or core so that the outlay of component parts can be reduced even more markedly.
REFERENCES:
patent: 4065058 (1977-12-01), Knape et al.
patent: 4428559 (1984-01-01), Ichiryu et al.
patent: 4585176 (1986-04-01), Kubach et al.
patent: 4795098 (1989-01-01), Kirchner et al.
patent: 4830286 (1989-05-01), Asslaender et al.
patent: 31 39 288 (1983-04-01), None
patent: 33 36 010 (1985-04-01), None
patent: 36 30 092 (1988-03-01), None
patent: 40 03 227 (1991-01-01), None
patent: 41 40 070 (1993-06-01), None
patent: 196 38 201 (1998-04-01), None
patent: WO93/18299 (1993-09-01), None
Kenyon & Kenyon
Nguyen Dinh Q.
Robert & Bosch GmbH
Scherbel David A.
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