Valves and valve actuation – Electrically actuated valve – Including solenoid
Patent
1996-08-12
1998-03-03
Lee, Kevin
Valves and valve actuation
Electrically actuated valve
Including solenoid
251 48, 251 50, 335261, 335279, 3031192, F16K 3106
Patent
active
057226334
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to solenoid valves, and more particularly to solenoid valves for slip-controlled brake systems of automotive vehicles.
BACKGROUND OF THE INVENTION
In a solenoid valve of the type disclosed in German patent application 35 29 124, the stop noises produced by transition of the armature into the one or the other end position are dampened by a hydraulic damper piston arranged on the magnet armature and subdividing a damper chamber in the valve housing into two compartments. The damper piston operates in two directions of movement provided that pressure fluid from one compartment can flow in a throttled manner into the other compartment through the annular slot at the damper piston. In addition, the application discloses arranging a non-return valve in the damper piston which, in response to its opening direction, influences in a defined manner the dampening in the one or the other direction of movement of the armature. Hydraulic dampening of this type is responsive to viscosity so that the valve operating times and switching noises vary with changes in temperature or upon application of the valve for different operating media. Further, the sophisticated construction of the valve is inappropriately costly in practical operations.
German patent application 40 35 817 discloses a solenoid valve. The valve has a longitudinally movable valve closure member which interacts with a valve seat in a valve chamber filled with pressure fluid. The stem of the valve closure member penetrates a coaxially extending bore portion of a guide member, the bore portion being enlarged towards the valve seat. On the side of the valve seat, the valve closure member carries an element, for example, an annular spacer, which closes the enlarged bore portion of the guide member at least approximately. A throttling non-return valve is provided hereby which, in the one direction of movement of the valve closure member, at least hinders the discharge of pressure fluid from the enlarged bore portion, but which releases the delivery of pressure fluid into the enlarged bore portion in the other direction of movement.
SUMMARY OF THE INVENTION
An object of the present invention is to simplify the construction of the solenoid valve disclosed in the previously mentioned prior art so that uniform valve operating times are achieved irrespective of viscosity variations and the noises produced during operation of the solenoid valve are dampened to a lowest possible constant level.
In this design, the movement of the magnet armature is dampened hydraulically by the pressure fluid volume compressed in the pressure fluid chamber inside the magnet armature and, subject to friction, is dampened direction-responsively by the sealing element pressed against the valve housing. The result is that valve noises are minimized above all during the opening movement of the valve closure member. The effect of the sealing element and the diaphragm can be chosen such that a disadvantageous delay in switching the solenoid valve will not occur. Rather, the volumetric flow inside the solenoid valve can be finely adjusted by the dampened opening movement of the closure member until the magnet armature abuts on the valve housing in the fully opened valve position in a hydraulically dampened fashion. Finally, the pressure fluid volume compressed in the magnet armature due to the opening movement of the valve member also contributes to increasing the pressing force on the sealing lip of the sealing element, thereby boosting the damper effect.
The embodiments of the present invention which will be illustrated and explained in the following detailed description disclose further features and advantages of the present invention with reference to the accompanying drawing.
BRIEF DESCRIPTION OF THE DRAWING
The FIGURE shows a cross-section taken through a solenoid valve.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT
A solenoid valve, when electromagnetically de-energized as shown in the FIGURE is in its open basic positi
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Goossens Andre F. L.
Timmermans Marc
Wupper Hans
ITT Automotive Europe GmbH
Lee Kevin
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