Fluid handling – Processes
Patent
1994-12-02
1996-10-01
Lee, Kevin
Fluid handling
Processes
25112915, 25112921, F16K 3106
Patent
active
055603866
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a method for adjusting a valve and more particularly to a method for adjusting the dynamic medium flow quantity of an electromagnetically actuatable valve.
BACKGROUND INFORMATION
In known valves, the dynamic medium flow quantity given off during the opening and closing operation is set by the value of the elastic force of a return spring acting on the valve closure member. The valve known from German Unexamined Patent Application No. 37 27 342 has an adjustment bolt which is displaceably arranged in a longitudinal bore of the internal pole and against one end of which one end of the return spring rests. The depth of insertion of the adjustment bolt into the longitudinal bore of the internal pole determines the value of the elastic force of the return spring. From German Unexamined Patent Application No. 29 42 853 there is known a valve in which the elastic force of the return spring is adjusted by the screwed-in depth of an adjustment screw which can be screwed into the longitudinal bore of the internal pole and against the one end of which one end of the return spring rests.
The adjusting of the dynamic medium flow quantity by the adjustment of the elastic force of the return spring which acts on the valve closure member has, however, the disadvantage that on the completely assembled valve there must be provided a possibility to access the return spring in the form of an easily accessible adjustment element on which an additional seal must be provided.
From European Patent No. 0 301 381 there is already known a method for adjusting the injected quantity of fuel of a fuel injection valve wherein an adjustment tube is introduced up to a predetermined length into a longitudinal bore of a tubular connection piece, the adjustment tube is temporarily fixed in position within the connection piece by press fitting or caulking, the adjustment tube being finally adjusted during verification of the actual quantity of fuel injected and fixed in position in the longitudinal bore of the connection piece by caulking an external circumferential section of the connection piece. This known adjustment method has the disadvantage that, after the final adjusting of the adjustment tube, there is still required as additional operation the fixing in position of the adjustment tube by caulking the external circumferential section of the connection piece and thus deforming the injection valve. Due to the caulking there is the danger that the position of the adjustment tube and thus the quantity of fuel set are changed.
In order to avoid this danger, it has already been proposed in German Patent Application No. P 42 11 723.3 to employ a slit adjustment sleeve which is under an initial tension acting in radial direction whereby the caulking of an external circumferential section of the connection piece for the final fixing in position of said adjustment sleeve in the connection piece is no longer required. The adjustment sleeve therefore assumes its defined position without any deformation of the valve and the medium flow quantity adjusted in final manner is not subject to subsequent changes.
All injection valves which are already known have in common that manipulations with adjustment tools inside the injection valve are required due to the adjusting of differently developed adjustment elements such as adjustment bolts, adjustment screws, adjustment tubes or adjustment sleeves. This results, in each case, in high demands on the quality of the adjustment elements and on a defined manipulation of the adjustment tools so as to avoid deformations within the injection valve. Furthermore, upon the insertion of an adjustment tool into the injection valve, there is always a danger of dirtying. In addition, there is also the danger of the formation of chips upon the movement of the adjustment element inside the injection valve which may have a particularly detrimental effect upon the operation of the injection valve.
SUMMARY OF THE INVENTION
The method, in accordance with the pr
REFERENCES:
patent: 4832314 (1989-05-01), Trott
patent: 4915350 (1990-04-01), Babitzka et al.
patent: 4967966 (1990-11-01), Babitzka et al.
patent: 5236174 (1993-08-01), Vogt et al.
Maier Martin
Reiter Ferdinand
Lee Kevin
Robert & Bosch GmbH
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