Fluid handling – Systems – Sequentially progressive opening or closing of plural valves
Patent
1998-05-04
2000-03-07
Bennett, Henry
Fluid handling
Systems
Sequentially progressive opening or closing of plural valves
1375992, 137630, F16K 3102, F16K 3140
Patent
active
060326921
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to an electromagnetic valve, in particular for hydraulic automotive vehicle brake systems with wheel slip control.
German patent application No. 40 30 571 discloses an electromagnetic valve of the type referred to hereinabove which includes a valve housing accommodating a sleeve that houses a magnetic core. Close to the magnetic core, a magnetic armature with a valve closure member is arranged. In the electromagnetically non-energized initial position, the valve closure member closes a valve passage between a first and a second pressure fluid channel in the valve housing under the action of a compression spring. Pressure differences develop in the pressure fluid channels in the valve's closed position downstream and upstream of the valve and can impair the switching speed of the valve. Further, great differences in temperature impair the viscosity of the fluid and take influence on the operation of the valve.
Therefore, an object of the present invention is to improve upon an electromagnetic valve of the type referred to hereinabove to such effect that differential pressures and temperature effects do not impair the operability of the valve in its switching actions so that as constant and as high switching speeds of the valve as possible can be achieved.
SUMMARY OF THE INVENTION
According to the present invention, this object is achieved by an electromagnetic valve of the initially mentioned type including a valve housing in which a sleeve housing a magnetic core is inserted, a magnetic armature on which a valve closure member is mounted which, in its electromagnetically non-energized initial position, under the action of a spring, closes a valve passage between a first pressure fluid channel in the valve housing and at least one further pressure fluid channel in the valve housing, wherein the valve passage is provided in a valve member that is movably arranged in the valve housing.
Further features, advantages and favorable embodiments of the present invention will be described in detail hereinbelow, making reference to the accompanying drawing.
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 shows an electromagnetic valve which is preferably used for hydraulic automotive vehicle brake systems with wheel slip control.
DETAILED DESCRIPTION OF THE DRAWING
The embodiment of FIG. 1 discloses an electromagnetic valve which is preferably used for hydraulic automotive vehicle brake systems with wheel slip control. The electromagnetic valve includes a valve housing 2 in which a sleeve 13 is inserted.
Sleeve 13 houses a magnetic core 14 and also, in sections, a magnetic armature 16 which is radially guided and corresponds with the magnetic core 14. Provided on a tappet-shaped extension at the frontal end of the magnetic armature 16, remote from the magnetic core 14, is a valve closure member 7 which is urged against a valve member 3 under the action of a spring 15 compressed between the magnetic armature 16 and the magnetic core 14. Thereby, a valve passage 1 which extends coaxially through the valve member 3 is closed by the valve closure member 7. Subjected to the spring 15 which acts on the magnetic armature 16, the valve member 3 bears against a bore step 6 in the valve housing 2 so that there is also a contact between the valve member 3 and the valve housing 2 that is impermeable to pressure fluid. The electromagnetic valve shown in FIG. 1 adopts its electromagnetically non-energized initial position where a pressure fluid channel 11, which opens downstream of the valve (shown in the drawing), and a second pressure fluid channel 12 which opens radially upstream of the valve closure member 7, are hydraulically isolated due to the pressure-fluid closing effect of the valve closure member 7 on the valve member 3 and the pressure-fluid closing effect of the valve member 3 in relation to the valve housing 2. The first pressure fluid channel 11 preferably extends to a suction port of a pump 19, and the second pressure fluid channel 12 is connected to a pre
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Bennett Henry
ITT Manufacturing Enterprises Inc.
Kim Joanne Y.
LandOfFree
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