Metal working – Method of mechanical manufacture – Prime mover or fluid pump making
Patent
1996-01-11
1998-08-04
Solis, Erick R.
Metal working
Method of mechanical manufacture
Prime mover or fluid pump making
2988844, 2940708, B23P 1500
Patent
active
057875839
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention relates to an apparatus and a method for setting a valve lift, in particular a valve needle lift of an injection valve of an internal combustion engine of the generic type of the respective independent claims.
An injection valve according to DE-A1 40 26 721 has a valve seat body in a valve housing, with the valve seat body being connected to an apertured body which is fixed with respect to the housing. A valve needle with a valve closing body is seated on the valve seat body. The precise setting of the valve needle lift takes place on the completely assembled injection valve by plastically deforming the apertured body, which is fixed with respect to the housing, in the direction of the valve closing body. The deformation of the apertured body reduces the valve needle lift from a preset magnitude to a required valve lift. The valve needle lift defines the static flow volume of the injection valve.
An efficient valve production requires that the integration of the setting of the valve lift into an assembly line production process be possible. This also means that it must be possible to set the valve lift with a high degree of repeating accuracy.
ADVANTAGE OF HE INVENTION
The apparatus having the characterizing features of claim 1 has the advantage that a shifting of the valve seat is possible with a high degree of repeating accuracy by means of plastic deformation of the apertured body at a high feeding speed of the pressing punch. In this manner a cycle time is reached for the setting of the valve lift which allows an integration into an assembly line production process. The method according to the invention is based on a self-learning setting sequence for the setting of the lift and is comprised of a learning phase and a final lift-setting phase. Due to the optimization of the parameters achievable in this manner, highest quality is accomplished at a cycle time which is as short as possible. Furthermore, it is also possible to use this method for different types of valves by editing the parameters.
The measures listed in the dependent claims allow advantageous modifications and improvements of the apparatus according to the invention. It is especially advantageous to implement the force admission via a spring element. In this process, the spring element acts as transmission and allows for a fast feeding speed of the adjustment device. The arrangement of a force sensor in the force transmission chain allows a good approach point recognition so that, in addition, a relatively high approach speed is possible. A high-resolution path measuring system is seated on the valve and can be displaced vertically so that the effects of elasticities of the apparatus can be eliminated. A special clamping arrangement ensures that the valve orients itself freely according to an infeed plane surface and thus is given a defined position.
DRAWING
In the following, the invention is described in greater detail by way of an embodiment which is shown in the drawing. FIG. 1 shows a cross section of a nozzle-side end of an internal combustion injection valve,
FIG. 2 a fundamental representation of a side view of the apparatus according to the invention,
FIG. 3 a sectional representation according to the lines III--III pursuant to FIG. 2,
FIG. 4a a first section of a process sequence schedule to determine a valve lift during setting and FIG. 4b a second section of the process sequence schedule according to FIG. 4a.
EMBODIMENT
The injection valve 20, whose nozzle-end section is partially shown in FIG. 1, has a tubular seat support 21 with a longitudinal opening 23 in which, for example, a tubular valve needle 24 is arranged which rests with a spherical valve closing body 25 in a guide opening 26 of a valve seat body 27. The valve seat body 27 is concentrically and fixedly welded to an apertured body 28 at the end face facing away from the valve closing body 25. The apertured body 22 has a pot-shaped cross section having a circumferential retaining edge 29. In the longitudinal opening 23, the apertured
Dowedeit Uwe
Feder Meinrad
Hartmann Volker
Pfrommer Karl-Heinz
Roerig Markus
Robert & Bosch GmbH
Solis Erick R.
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