Valves and valve actuation – Electrically actuated valve – With means to bias valve open
Patent
1998-08-07
2000-07-25
Rivell, John
Valves and valve actuation
Electrically actuated valve
With means to bias valve open
3031192, B60T 836
Patent
active
06092781&
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 magnet-actuated manner into its position that stops the through flow of pressure fluid. In terms of its design, the known valve is thus an on-off valve in the form of a reasonably priced 2/2-way valve. Furthermore, structural measures on the closing member and tappet achieve the fact that starting from the closed position of the seat valve, when there is a sufficiently great pressure difference, hydraulic forces cause a partially closed position to be automatically set, in which the volume flow is reduced. The known valve can therefore be advantageously used, for example, in slip-controlled hydraulic brake systems in order, when there is a pressure increase, e.g. of a brake slip regulation, to produce a favorable behavior with regard to the performance quality and the noise emission.
ADVANTAGES OF THE INVENTION
The valve according to the invention, has the advantage over the prior art that it can, in a manner similar to a proportional valve, be transferred into an arbitrarily large number of intermediary positions by means of controlling the magnetic force with small strokes, but without having the costly design of a proportional valve. This action can be attributed to the fact that by way of the valve stroke, the restoring spring essentially determines the progression of the force engaging the tappet, while the hydraulic force acting on the closing member only has a subordinate influence due to the geometric proportions of the influx bore and the valve seat. A largely continuous through flow control can therefore be produced with the valve according to the invention. In many industrial applications, it can be used in place of proportional valves. In slip-controlled brake systems, the use of the valve according to the invention results in a higher performance quality and a lower noise emission than with the known valve.
With the embodiments indicated herein, a definite relief of the pressure fluid stream from the closing member and from the valve seat, respectively, is achieved after the opening of the valve. Unstable flow forces are consequently prevented to a large extent.
The improvement of the invention disclosed has the advantage that a pressure fluid stream relieved from the closing member and the valve seat no longer strikes the tappet as its course continues. This prevents interfering influences due to flow forces.
With the embodiment of the invention indicated, it is easily possible to adjust the spring force of the restoring spring, for example in the closed position of the seat valve, by means of adjusting the position of the sleeve relative to the tappet.
BRIEF DESCRIPTION OF THE DRAWINGS
An exemplary embodiment of the invention is shown in simplified form in the drawings and will be explained in detail in the description below.
FIG. 1 shows a longitudinal section through an electromagnetically actuated valve with a seat valve,
FIG. 2, as detail II from FIG. 1, shows the seat valve disposed in the closed position, in a scale that is enlarged in relation to FIG. 1, and
FIG. 3 shows a diagram of the forces acting in the seat valve over the valve opening stroke.
DESCRIPTION OF THE EXEMPLARY EMBODIMENT
An electromagnetically actuated valve 10 depicted in FIG. 1 of the drawings has a valve housing 11 with which it is received 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 fashion on the pole core 13. An annular magnet coil 16, which is enclosed by a magnetic flux-conducting housing 15, is slid onto this valve dome and onto the pole core 13.
A longitudinally movable magnet armature 19 is disposed in the valve dome 14. This armature engages a tappet 20 onto which a sleeve 21 is presse
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Hohl Gunther
Mittwollen Norbert
Sommer Dietmar
Greigg Edwin E.
Greigg Ronald E.
Rivell John
Robert & Bosch GmbH
Schoenfeld Meredith H.
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