Fluid sprinkling – spraying – and diffusing – Including valve means in flow line – Reciprocating
Patent
1992-04-22
1993-11-23
Kashnikow, Andres
Fluid sprinkling, spraying, and diffusing
Including valve means in flow line
Reciprocating
2395332, 23953314, 2395851, 251359, 25112918, F02M 6118
Patent
active
052636488
DESCRIPTION:
BRIEF SUMMARY
The invention is based on an injection valve and a method for the manufacture of an injection valve respectively. An injection valve is already known from DE 37 10 467 Al, which has a pot-shaped body with holes upstream of its valve seat area. The body with holes is firmly clamped between the jet body and a processing sleeve. To set the valve needle lift, and hence the static flow volume of a medium discharged during the stationary opening condition of the injection valve, the front face of the jet body, against which the stop plate which determines the residual airgap of the armature opposite the core, rests, has to be ground. However, this valve and the method of manufacture have the disadvantage that the front face of the jet body can be ground only when the valve is partly dismantled, making the accurate setting of the valve needle lift very laborious.
DE 38 41 142 Al shows an injection valve with a pot-shaped body with holes, the retaining edge of which extends in an axial direction, facing away from the valve seat area and being connected with the wall of the locating bore of the valve-seat body. The valve seat body is pushed into the longitudinal orifice of the seat support and is firmly connected with it, with the valve seat body's depth of insertion into the longitudinal orifice of the seat support determining the valve needle lift. With this valve it is again impossible, in its fully assembled condition, to set the valve needle lift without having to at least partly dismantle the valve.
An injection valve with a valve seat body, having at least one ejection orifice, is described in DE 38 31 196 Al. The valve seat body is pressed into the longitudinal orifice of the seat support, with the depth of pressing determining the valve needle lift. Although the valve needle lift can be set on the fully assembled injection valve, the press-in method of locating the valve seat body in the seat support presents the risk of chipping the valve seat body and/or the seat support.
ADVANTAGES OF THE INVENTION
The injection valve and method in accordance with the invention and the method for the manufacture of an injection valve with characterizing features of claim 7, have an advantage of a particularly simple and economical, fully automated and accurate, setting of the valve needle lift and hence of the static flow volume of a medium discharged during the stationary opening condition, by virtue of the deformation in the axial direction, in the area between the fixing areas of the body with holes, of the valve seat part which consists of the valve seat body and the body with holes. A simple design of the injection valve results, moreover, with a simple and economical manufacture of the valve seat body and the body with holes. It is ensured that the axial extension of the body with holes is not changed in the area of the holes due to mounting the injection valve, and that the desired, specified injection characteristic, is obtained.
It is advantageous, if one retaining edge of the pot-shaped body with holes extends in an axial direction, facing away from the valve seat body, and if that retaining edge, with its free end, is firmly connected with the wall of the longitudinal orifice of the valve seat support. This ensures, on the one hand, a firm and secure hold of the valve part which consists of the valve seat body and the body with holes, in the longitudinal orifice of the seat support, and on the other hand, the body with holes can be deformed in a simple manner in an axial direction in the area between the fixing positions, in order to effect an accurate setting of the valve needle lift.
It is of particular advantage, if the retaining edge of the body with holes is bent outwards towards its free end, whereby its end diameter will be larger than the diameter of the seat support's longitudinal orifice, so that the retaining edge, on insertion of the valve part into the longitudinal orifice of the seat support, will have a radial spring action and will rest on the wall of the longitudinal orifice with light pre
REFERENCES:
patent: 4423841 (1984-01-01), Palma
patent: 4454990 (1984-06-01), Lewis
patent: 4699323 (1987-10-01), Rush et al.
patent: 4771984 (1988-09-01), Szablewski et al.
patent: 5002231 (1991-03-01), Reiter et al.
Maier Martin
Reiter Ferdinand
Vogt Dieter
Greigg Edwin E.
Greigg Ronald E.
Kashnikow Andres
Robert & Bosch GmbH
Trainor Christopher G.
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