Valves and valve actuation – Electrically actuated valve – Including solenoid
Patent
1991-10-29
1993-03-30
Michalsky, Gerald A.
Valves and valve actuation
Electrically actuated valve
Including solenoid
13762565, 2511291, 251337, F16K 3106, F15B 13044
Patent
active
051977095
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to an electromagnetically actuated directional control valve.
Such an electromagnetically actuated directional control valve, in which a longitudinally movable control slider can be brought into different switching positions by a resetting device and at least one magnet, is already known from U.S. Pat. No. 3,967,648. The resetting device is constructed in such a way that a spring plate and a restoring spring are assigned to each front side of the control slider and, in a three-position valve construction, center the control slider in a central position. A deflection in opposite directions can be effected by means of actuating two magnets. Each magnet comprises a pressure tube. An armature is guided in the interior of the latter, which interior is filled with pressure medium. A disadvantage in this construction consists in that the restoring springs and the spring plates are structural component parts which are separate from the valve housing and from the magnets and must be dealt with separately and installed carefully when assembling the magnets at the valve housing, which increases the assembly cost. Such separate parts can also be lost or incorrectly installed when exchanging a magnet. Further, this construction can have a disadvantageous effect on the overall length of the magnet valve.
Further, a magnet valve in which a valve bush with annular flange is undetachably held at the base of a magnet housing by means of flanging is known from DE-PS 33 07 554. If this magnet housing comprising a valve bush is assembled with a valve housing, tensions in the structural component parts, which could otherwise occur as a result of angular deviations of the longitudinal axes of the magnet and valve bush, are prevented. A resetting device comprising a spring plate is not provided in this patent.
Further, it is known from DE-OS 23 17 495 to hold individual structural components in a magnet valve so as to be undetachable by means of flanged connections in other structural components. This magnet valve is constructed as a seat valve and has no resetting device comparable to that of a directional control valve.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide an electromagnetically actuated directional control valve which avoids the disadvantages of the prior art.
In keeping with these objects and with others which will become apparent hereinafter, one feature of the present invention resides, briefly stated, in an electromagnetically actuated directional control valve in which a pressure tube of at least one magnet receives a restoring spring with a respective spring plate in its interior, and the pressure tube has a support which prevents the spring plate from falling out. The electromagnetically actuated directional control valve in accordance with the present invention has the advantage over the prior art that it comprises complete preassembled functional units which enable a simple and secure assembly at the directional control valve housing. The substantial parts of the resetting device, such as the restoring spring and spring plate, are now integrated in the pressure tube of the magnet and undetachably held in the latter, so that this functional unit can be handled easily and can also be stocked. The spring plate and restoring spring are also undetachable and accordingly also protected against incorrect assembly during a subsequent dismantling of the directional control valve. The guidance of the restoring spring and spring plate in the pressure tube can be ensured at low cost and in a simple manner. In addition, this functional unit favors a short overall length of the directional control valve and particularly a short overall length of the control slider at which guide elements are no longer necessary. Further, the functional unit can be used in different types of valves and can be inexpensively produced.
The directional control valve of the invention, has a simple, space-saving, inexpensive construction.
In accordan
REFERENCES:
patent: 3967648 (1976-07-01), Tirelli
patent: 4422475 (1983-12-01), Aspinwall
patent: 4548383 (1985-10-01), Wolfges
patent: 4611632 (1986-09-01), Kolchinsky et al.
Kroll Peter
Leutner Volkmar
Neumann Gunter
Michalsky Gerald A.
Robert & Bosch GmbH
Striker Michael J.
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