Joints and connections – Member deformed in situ – Deformation occurs simultaneously with assembly
Patent
1992-10-30
1994-06-28
Reese, Randolph A.
Joints and connections
Member deformed in situ
Deformation occurs simultaneously with assembly
403 19, 403274, 2989013, F16K 3100, F16B 1700
Patent
active
053241347
DESCRIPTION:
BRIEF SUMMARY
STATE OF TECHNOLOGY
The invention is based on a positive connection of a magnetically operated valve to a housing block of the valve. The invention further concerns a method of forming a positive connection of a magnetically operated valve to a housing block of a valve.
When fitted in a locating bore, magnetically operated valves are generally in contact with pressure medium feed and discharge lines which terminate in this bore. The fitted magnetically operated valves therefore have high forces acting upon them through the pressure medium which have to be absorbed by the housing block. The positive connections, which are usually achieved by screwing magnetically operated valves into the housing block, or, by holddown plates connected to them, must therefore withstand high stresses, in particular where the magnetically operated valves are those of vehicle hydraulic brake units. Such connections are therefore not only of too costly a design, but also necessitate a relatively high amount of time to be spent on their assembly.
A method is known, for example, from the DE-A-38 10 581, by which two connection plates, which are arranged, parallel with each other, are provided with channels carrying a pressure medium, by arranging one or more magnetically operated valves between the connection plates and clamping these together by means of bolts.
It is further known from the DE-A.38 10 581 that a sleeve section of a magnetically operated valve, opened at the end and carrying a pressure medium, is located in the bore of a housing block of steel and that the aperture edge of the bore is caulked against the sleeve section. Such a positive connection is expensive to manufacture and is problematic with regard to a tight seal.
The invention is therefore based on the task of manufacturing a connection to withstand high stresses between a magnetically operated valve and a housing block, which is largely independent of the material used for the housing block and which is of high precision.
ADVANTAGES OF THE INVENTION
In contrast, the positive connection in accordance with the invention has the advantage that it can be produced within a very short time and in few operations, namely by inserting the magnetically operated valve into the locating bore, pushing the sleeve over the magnetically operated valve, and pressing the sleeve into the gap. These operations can be economically carried out on automatic assembly lines. The connection centers the magnetically operated valve and is capable of absorbing very high axial forces which will attempt to eject the magnetically operated valve from its locating bore. Moreover, the forming of the connection can be easily checked by measuring the pressing depth of the sleeve.
The measures listed herein enable advantageous developments and improvements of the positive connection specified herein.
Using the dimensioning specified for a tapered undercut angle, the forming forces are kept low in the sleeve region which engages in the undercut, and a relatively large cross-sectional area is produced in the deformed sleeve region, which can absorb shearing forces which are caused by ejection forces acting on the magnetically operated valve.
High shearing forces can be absorbed by the sleeve, if the sleeve is metallic.
A sleeve of rolled strip material enables cost advantages during the manufacture of the sleeve to be achieved, in particular if connection of the ends can be dispensed with. In addition, a sleeve which is slit in this way can adapt to diameter tolerances of the locating bore.
Projecting the sleeve beyond a front face allows the construction of the connection to be easily checked by a visual and measurement check.
Projecting the sleeve beyond a front face permits a removal of the positive connection by simple means, for example when the magnetically operated valve is to be replaced.
The method specified herein is remarkable for the facility of allowing the simply formed components, magnetically operated valve and housing block, to be assembled in a few steps to form a connectio
REFERENCES:
patent: 2466546 (1949-04-01), Huelster
patent: 3749190 (1973-07-01), Shipman
patent: 4274665 (1981-06-01), Marsh
patent: 4436495 (1984-03-01), McCullough
patent: 4746240 (1988-05-01), Tarum
Alaze Norbert
Kaes Guenter
Greigg Edwin E.
Greigg Ronald E.
Knight Anthony
Reese Randolph A.
Robert & Bosch GmbH
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