Valves and valve actuation – Electrically actuated valve – Including solenoid
Reexamination Certificate
2000-05-30
2001-10-16
Shaver, Kevin (Department: 3754)
Valves and valve actuation
Electrically actuated valve
Including solenoid
Reexamination Certificate
active
06302371
ABSTRACT:
BACKGROUND INFORMATION
The present invention relates to an electromagnetically actuatable valve.
Various electromagnetically actuatable valves are known, in particular fuel injectors, in which parts that are subject to wear are provided with a wear-resistant coating. Thus, for example, it is known from German Published Patent application No. 32 30 844 to provide the armature and stop face of a fuel injector with wear-resistant surfaces. These surfaces can be nickel-plated, i.e. provided with an additional coating, or nitrided, i.e. cured through the application of nitrogen.
In German Published Patent application No. 38 10 826, a fuel injector is described in which at least one stop face is executed in the shape of a spherical cup, in order to obtain the most precise possible air gap, an additional round-body insert made of non-magnetic, high-strength material being mounted centrally on the stop face. The two spherical-cup-shaped stop faces contact each other precisely in the center in the area of the valve longitudinal axis.
From German Published Patent application No. 44 21 935, an electromagnetically actuatable valve is described, which has a special stop area. The valve has at least one component, the armature and/or the core, that has a wedge-like surface before a wear-resistant layer has been applied, the surface being able to be produced in each case differently in accordance with a magnetic and hydraulic optimum. An annular stop segment formed by the wedge quality has a defined stop surface width and contact width, which remains constant over the entire service life, since in response to continuous operation, stop surface wear does not lead to an enlargement of the contact width.
SUMMARY OF THE INVENTION
The electromagnetically actuatable valve according to the present invention has the advantage that one of the components that strike against each other, armature and core, is configured such that it is assured, after producing a wear-resistant surface, that the stop surface is not undesirably enlarged due to wear even after long periods of operation, so that the operating and decay times of the movable component remain virtually constant. This is achieved due to the fact that one of the components striking against the other already has a spherically curved surface before the generation of the wear-resistance.
The components configured in this manner have the advantage of improved long-term durability, since the stop is in the area of an annular contact line in the center of the surface and not on the easily-damaged edges.
The simple geometry of the spherically curved end face is easy to manufacture and to check.
It is particularly advantageous, due to the very small manufacturing expense, to configure the spherical curvature of the end face as a spherical segment or a spherical cup segment.
It is advantageous to fixedly join the armature to a valve needle that is axially movable along the valve longitudinal axis, to arrange a valve-closure member at the opposite end, the valve-closure member being spherically shaped, and to place the center point, for the formation of the spherical-segment-shaped contour of the end face on the armature at the distance of the desired radius, in the center point of the valve-closure member. Even in the event of a large so-called radial deviation of the valve-closure member with respect to the armature, there exists a quite high tolerance-insensitivity of the stop proportions.
Using this configuration of the stop area, a good hydraulic stop damping capacity is achieved, because due to the relatively large radius narrow compression gaps of <10 &mgr;m are formed.
REFERENCES:
patent: 3582039 (1971-06-01), Cagle
patent: 4264040 (1981-04-01), Saito
patent: 4423841 (1984-01-01), Palma
patent: 4423843 (1984-01-01), Palma
patent: 4666087 (1987-05-01), Jaggle et al.
patent: 4786030 (1988-11-01), Greiner et al.
patent: 4946103 (1990-08-01), Ganser
patent: 5820031 (1998-10-01), Reiter et al.
patent: 5875975 (1999-03-01), Reiter et al.
patent: 5992822 (1999-11-01), Nakao et al.
patent: 32 30 844 A (1984-02-01), None
patent: 38 10 826 A (1989-10-01), None
patent: 44 21 935 A (1995-06-01), None
patent: 0 009 388 A (1980-04-01), None
patent: 2 196 181 A (1988-04-01), None
Bonderer D. Austin
Kenyon & Kenyon
Robert & Bosch GmbH
Shaver Kevin
LandOfFree
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