Fluid sprinkling – spraying – and diffusing – Including valve means in flow line – Reciprocating
Patent
1991-08-19
1992-09-01
Kashnikow, Andres
Fluid sprinkling, spraying, and diffusing
Including valve means in flow line
Reciprocating
25112918, 239900, F16K 3106, F02M 5108
Patent
active
051433010
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention is based on an electromagnetically actuable valve. German DE-PS 3,102,642 already discloses an electromagnetically actuable valve with axial fuel inflow, in which although a stop device which limits the opening path of the valve closing element is provided, depending on the skew position or deviation of the valve needle consisting of valve closing element, rod and armature, different stop locations and thus opening strokes of the valve closing element which deviate from one another occur with the said stop device. In addition, there is the risk that with a deformation of the stop surfaces occurring with increasing operating time as a result of non-uniform stopping, the injected fuel quantity may no longer be sufficiently accurately metered.
ADVANTAGES OF THE INVENTION
The electromagnetically actuable valve according to the invention has, in contrast with the above, the advantage that the opening stroke of the valve closing element is not influenced by a skew position of the valve needle. In addition, a possibly required stop plate which generates a residual air gap and is not magnetisable is omitted. The large axial spacing between the guidance on the valve closing element and the armature guidance additionally largely prevents a skew position of the valve needle.
It is particularly advantageous if the valve closing element has an outwardly bent surface in the region touched in the opening position of the valve by the stop rod, in order, even with relatively large skew positions of the valve needle, to guarantee an exact stop location and thus a constant opening stroke of the valve closing element.
For the same reason, it is also advantageous if the stop rod has an outwardly bent surface on its end side facing the valve closing element.
It is particularly advantageous to construct the stop rod of a non-magnetizable material so that no influence on the magnetic field arises from the stop rod.
It is also advantageous if the stop rod has a hardened surface, in particular on the end face facing the valve closing element, for the purpose of reducing wear.
It is equally advantageous if a displacement sheath which has throughflow openings in the direction of flow for fuel and is connected to the stop rod is displaceably mounted in the core so that a simple and rapid assembly of the stop rod and a problem-free fuel flow through the displacement sheath is guaranteed.
It is advantageous if the displacement sheath has impressions running in the axial direction and pointing radially inwards which form contact surfaces between the displacement sheath and the stop rod and thus permit the secure connection of both components, whether by welding, soldering or by pressing. Above all, a displacement sheath of this construction permits, despite its low expenditure in terms of production technology, a problem-free through-flow of fuel.
It is particularly advantageous if the displacement sheath serves as a rest to a return spring acting on the valve closing element so that a simple and cost-effective assembly is obtained.
It is equally advantageous to use as a rest for the return spring acting on the valve closing element a bearing bush which is pressed into the core downstream of the displacement sheath and has openings in the direction of flow for the stop rod and the fuel. In this way, a setting of the spring force of the return spring which is independent of the press-in depth or screw-in depth of the displacement sheath into the core is guaranteed.
When manufacturing the valve according to the invention it is particularly advantageous if, in a first process step, a valve needle consisting of a valve closing element, connection pipe and armature is inserted into a connection component which is connected to the intermediate part and the core and which connects the intermediate part to the valve seat body downstream. In a next process step, the valve seat body is inserted into a retaining bore, constructed concentrically with respect to the valve longitudinal axis, of the connection component and
REFERENCES:
patent: 4403741 (1983-09-01), Moriya et al.
patent: 4585174 (1986-04-01), Knapp
patent: 4915350 (1990-04-01), Babitzka et al.
patent: 4984744 (1991-01-01), Babitzka et al.
Babitzka Rudolf
Reiter Ferdinand
Greigg Edwin E.
Greigg Ronald E.
Kashnikow Andres
Merritt Karen B.
Robert & Bosch GmbH
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