Fluid handling – Processes
Patent
1995-10-11
1997-08-05
Lee, Kevin
Fluid handling
Processes
25112915, 2989013, F16K 3106, B21K 124
Patent
active
056532490
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method for closing channels containing pressure fluid in a housing.
BACKGROUND OF THE INVENTION
German application P 42 21 988.4 discloses a closing member including an electromagnetically controlled valve, which is designed as valve accommodating member (cartridge) and is pressed into the channel system of a valve chamber block containing pressure fluid and provided with stepped bores. It is possible that the material in the area of the stepped bore is not only displaced mechanically into the groove-shaped recess on the valve accommodating member, but at the same time can also cause an undesired deformation of areas adjacent to the valve chamber block which may also be weakened by bores, thus affecting the dimensional accuracy of these areas sensitive to stability.
The objective of the present invention is to provide a method for closing channels containing pressure fluid in a housing which during the pressing-in process causes minimal dynamic stress of the housing, and which ensures that the plastic deformation grade is limited to the area of the housing which is necessary for the form-lock.
This objective is achieved by operating a closing member, by means of a pressing force with a defined direction and entity acting discontinuously on the closing member, such that it carries out a discontinuous feed motion directed into the channel, with the result that only the housing material (causing the plastic form-lock with the recess of the closing member) yields into that recess due to the discontinuous dynamic effect at the closing member.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a cross-section through a housing for the accommodation of several members which close the pressure fluid channels.
FIG. 2 shows a first dynamic load diagram.
FIG. 3 shows a second dynamic load diagram.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
FIG. 1 shows an example of how to use the fastening method of the present invention for several electromagnetic valves within a block-shaped housing 4, presenting at the same time a pump, a damping element as well as pressure fluid connections to a pressure fluid supply means and pressure fluid consumers. The closing member 1 is an essentially sleeve-shaped part of only few millimeters, consisting preferably of a cold-drawn material which is harder than that of housing 4. Housing 4, preferably made of aluminum alloy, consequently is less harder than the closing members 1 which are, for example, made of machining steel. This difference in hardness is finally decisive for the essentially positive fastening of the closing member 1 in housing 4. A convenient measure with regard to construction are the recesses on each closing member 1, formed as circumferential ring grooves and arranged approximately similar to grooves on the surface of closing member 1, which is graded with regard to the diameter.
Thus, during the pressing-in process the relatively soft material of housing 4 can yield into the groove 3 as a circumferential projection, due to its plastic deformation, and then be compressed. Since the diameter of closing member 1 diminishes with regard to the Joining direction, each closing member 1 therefore assumes the function of a caulking stamp in the steps to which the diameter of each stepped bore 2 of housing 4 is adapted. The original depth of the respective bore step in housing 4 is smaller than the necessary caulking stroke of the caulking stamp of the closing member 1 by the amount of the volume to be displaced in the Joining direction into the recesses 3. In FIG. 1 it can be seen that each sleeve-shaped closing member 1 accommodates the channels 6, 7 which can be closed by a valve tappet 5, the magnet core 8, the magnet coil 9, the valve sleeve 10, the valve seat 11 and a filter 13.
In order to ensure a safe sealing of the closing member 1 in housing 4, the through-bore 14 for the pressure fluid, formed as a transverse channel, has to be provided with a circumferential caulking point above and below the channel
REFERENCES:
patent: 5333836 (1994-08-01), Fukuyo et al.
Search of the German Patent Office for Application P4306220.2.
Reinartz Hans-Dieter
Volz Peter
Weisbrod Helmut
Zaviska Dalibor
ITT Automotive Europe GmbH
Lee Kevin
Lewis J. Gordon
Twomey Thomas N.
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