Valve for controlling fluids

Details Valve for controlling fluids Valve for controlling fluids

1998-10-30

2000-06-20

Rivell, John

Valves and valve actuation

Electrically actuated valve

Having element dimensionally responsive to field

251 57, 2395851, F16K 31122, F16K 3102

Patent

active

060768002

DESCRIPTION:

BRIEF SUMMARY
PRIOR ART

The invention relates to a valve for controlling fluids in a fuel injection valve. A valve of this kind has been disclosed by U.S. Pat. No. 4,813,601. The actuating piston of the valve member there is disposed so that it can move in a sealed fashion in a smaller diameter part of a stepped bore, while a larger diameter piston, which is moved with the piezoelectric actuator, is disposed in a larger diameter part of the stepped bore. A hydraulic chamber is fixed between the two pistons in such a way that when the larger piston is moved by the actuator by a particular distance, the actuating piston of the valve member is moved by a distance that is extended by the translation ratio of the stepped bore diameters. The valve member, the actuating piston, the larger diameter piston, and the piezoelectric actuator are disposed one after the other on a common axis. This disposition has the disadvantage that it requires a large amount of space, especially with regard to the length, when one takes into consideration the fact that for an effective actuation, a piezoelectric actuator is embodied as quite large.


ADVANTAGES OF THE INVENTION

The control valve according to the invention, has the advantage over the prior art that the position of the piezoelectric actuator in front of the actual valve member with its actuating piston can be disposed separately. i.e. at a spatial distance lateral to the valve member. As a result, with the necessarily large structural form of a piezoelectric actuator, space for accommodating this actuator is created next to the centrally disposed valve member. The actuator and valve member can thereby be disposed in parallel fashion next to each other over large areas.
Two exemplary embodiments of the invention are represented in the drawings and will be explained in detail in the subsequent description.


BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a first exemplary embodiment installed in an electrically controlled fuel injection valve that is embodied as a 2/2-way valve, of which only the essential parts are depicted, and
FIG. 2 shows a second exemplary embodiment of the control valve as a 3/2-way valve.


DETAILED DESCRIPTION OF THE DRAWINGS

The valve according to the invention is used in a fuel injection valve, essential parts of which are shown in the sectional view in FIG. 1. This injection valve has a valve housing 1 in which a valve needle 3 is guided in a longitudinal bore 2. On its one end, the valve needle is provided with a conical sealing face 4, which on the tip 5 of the valve housing that protrudes into the combustion chamber, cooperates with a seat from which injection openings lead. The injection openings connect the interior of the injection valve, in this instance the annular chamber 7 encompassing the valve needle and filled with fuel under injection pressure, to the combustion chamber in order to thus execute an injection when the valve needle has lifted up from its seat. The annular chamber communicates with another pressure chamber 8, which continuously communicates with a pressure line 10, by way of which the fuel injection valve is supplied with fuel at injection pressure from a high-pressure fuel reservoir not shown in detail here. This high fuel pressure also prevails in the pressure chamber 8 and acts on a pressure shoulder 11 on the valve needle 3 by way of which the nozzle needle can be lifted up from its valve seat in a known manner under suitable conditions.
On the other end of the valve needle, the valve needle is guided in a cylinder bore 12 and with its end face 14, encloses a control pressure chamber 15, which continuously communicates by way of a throttle connection 16 with an annular chamber 17, which, like the annular chamber 8, also continuously communicates with the high-pressure fuel reservoir. In the embodiment according to the invention, a throttle bore 19 leads axially from the control pressure chamber 15 to a valve seat 20 of a control valve 21. The valve seat 20 cooperates with a valve member 22 of the control valve 21, which in

REFERENCES:
patent: 4762300 (1988-08-01), Inagaki et al.
patent: 4813601 (1989-03-01), Schwerdt et al.
patent: 4995587 (1991-02-01), Alexius
patent: 5209453 (1993-05-01), Aota et al.
patent: 5803361 (1998-09-01), Horiuchi et al.

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