Valves and valve actuation – Electrically actuated valve – With means to bias valve open
Patent
1998-08-07
2000-09-05
Rivell, John
Valves and valve actuation
Electrically actuated valve
With means to bias valve open
25112915, 3031192, F16K 3106, B60T 836
Patent
active
061130664
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention is based on an electromagnetically actuated valve for hydraulic brake systems of motor vehicles.
A valve of this kind has already been disclosed (DE 44 12 648 A1), whose seat valve assumes its open position through the action of a restoring spring and can be switched in a magnetically actuated manner into its position that shuts off the through flow of pressure fluid. In terms of its construction, the known valve is therefore an on-off valve in the form of a reasonably priced 2/2-way valve. Furthermore, constructive measures on the closing member and tappet achieve the fact that with sufficiently great pressure drops, due to hydraulic forces, the seat valve is automatically moved from the closed position to a partially closed position in which the volume flow is reduced. The known valve can therefore be advantageously used in slip-controlled hydraulic brake systems in order to produce a favorable behavior with regard to performance quality and noise emission when there is a pressure increase, e.g. of a brake slip control.
ADVANTAGES OF THE INVENTION
The valve according to the invention has the advantage over the prior art that similar to the function of a proportional valve, it can be transferred using small strokes into an arbitrarily large number of intermediary positions by controlling the magnetic force, but without being required to have the costly design of a proportional valve. This manner of function can be essentially attributed to the fact that hydraulic forces acting on the closing member can be changed as a function of the stroke because of the configuration of the valve seat and closing member. With the valve according to the invention, therefore, a largely continuous through flow control can be achieved. In many applications, it can be used in lieu of proportional valves. In slip-controlled brake systems, the use of the valve according to the invention achieves a higher performance quality and a lower noise emission than are produced using the known valve.
A definite relief of the pressure fluid flow is achieved with the valve set forth hereinafter.
Consequently, unstable flow forces are to a large extent prevented.
BRIEF DESCRIPTION OF THE DRAWINGS
An exemplary embodiment of the invention is represented in simplified form in the drawings and will be explained in more detail in the description that follows.
FIG. 1 is a longitudinal section through an electromagnetically actuated valve, with a seat valve,
In the form of detail II from FIG. 1, FIG. 2 shows the seat valve disposed in the closed position, in a scale that is enlarged in comparison to FIG. 1, and
FIG. 3 is a diagram of the forces in the seat valve over the valve opening stroke.
DESCRIPTION OF THE EXEMPLARY EMBODIMENT
An electromagnetically actuated valve 10 represented in FIG. 1 of the drawings has a valve housing 11 with which it is contained in a valve block 12. Outside the valve block 12, the valve housing 11 is continued in a pole core 13. A sleeve-shaped valve dome 14 is fastened in a pressure-tight manner to the pole core 13. An annular magnet coil 16 that is enclosed by a magnetic flux-conducting housing 15 is slid onto this valve dome as well as a portion of the pole core 13.
A longitudinally movable magnet armature 19 is disposed in the valve dome 14. This armature engages a tappet 20, which is contained in a longitudinal bore 21 of the pole core 13 and the valve housing 11. A restoring spring 22 engages the longitudinally movable tappet 20 remote from the armature.
The restoring spring 22 is supported on a longitudinally bored valve body 23 that is press fitted into the valve housing 11. This valve body is connected to a pressure fluid inlet 24 of the valve 10, which communicates with a conduit bore 25 of the valve block 12.
On the end oriented toward the tappet, the valve body 23 has a valve seat 28 in the shape of a hollow cone, with a cone angle a of at most 110.degree. (FIG. 2). The valve seat 28 is centrally fed by an influx bore 29 with the diameter D.sub.1 and this bore communicate
REFERENCES:
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patent: 5605386 (1997-02-01), Ziegler et al.
patent: 5803556 (1998-09-01), Weis et al.
patent: 5836334 (1998-11-01), Mittwollen et al.
patent: 5879060 (1999-03-01), Megerle et al.
patent: 5934766 (1999-08-01), Feigel et al.
Hohl Gunther
Mittwollen Norbert
Sommer Dietmar
Greigg Edwin E.
Greigg Ronald E.
Rivell John
Robert & Bosch GmbH
Schoenfeld Meredith H.
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