EP0861970B1 - Device for an electromagnetic valve control - Google Patents

Device for an electromagnetic valve control Download PDF

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Publication number
EP0861970B1
EP0861970B1 EP98101234A EP98101234A EP0861970B1 EP 0861970 B1 EP0861970 B1 EP 0861970B1 EP 98101234 A EP98101234 A EP 98101234A EP 98101234 A EP98101234 A EP 98101234A EP 0861970 B1 EP0861970 B1 EP 0861970B1
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EP
European Patent Office
Prior art keywords
spring
accordance
valve stem
caps
developed
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EP98101234A
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German (de)
French (fr)
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EP0861970A1 (en
Inventor
Alexander Von Gaisberg
Thomas Stolk
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Mercedes Benz Group AG
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DaimlerChrysler AG
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01LCYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L9/00Valve-gear or valve arrangements actuated non-mechanically
    • F01L9/20Valve-gear or valve arrangements actuated non-mechanically by electric means

Definitions

  • the invention relates to a device for an electromagnetic Valve control according to that in the preamble Art defined by claim 1.
  • DE 33 07 070 C2 (or EP-A-0 722 039) describes an adjusting device for a gas exchange valve of an internal combustion engine is known.
  • this control device is an electromagnet system arranged with switching magnets, with deenergized electromagnet system an anchor plate in in a neutral position.
  • this oscillating spring-mass system with two springs, which are arranged on both sides of the anchor plate, available.
  • the present invention is therefore based on the object based on a device for an electromagnetic To create valve control, when de-energized Electromagnet system a neutral position Switching element independent of a spring constant is present and in which the effort for the spring system is low.
  • this task is characterized by Features mentioned in claim 1 solved.
  • the spring plate in de-excited State of an electromagnet system at travel limitation devices is a precisely definable one and neutral independent of a spring constant Position of a valve lifter accessible.
  • two embodiments are one Device for an electromagnetic valve control shown, which are arranged in a cylinder head and are basically of a known type, which is why only the essential for the invention Parts will be discussed in more detail.
  • Valve tappet 2 with an anchor plate 3 and one Valve plate 4, which has a valve seat in the cylinder head 1 interacts, shown.
  • the anchor plate 3 is at the end opposite the valve plate 4 of the valve lifter 2 connected to it.
  • the valve lifter 2 is in the cylinder head 1 slidably arranged that the anchor plate 3 and thus the valve lifter 2 depending on the state of excitation of an electromagnet system 5 in a valve opening position or valve closed position maintained can be.
  • valve lifter 2 In the de-energized state of the electromagnet system 5 the valve lifter 2 by means of a spring device 6 in held in a neutral position with the anchor plate 3 an approximately central position between two Switching magnet 7, 8 occupies.
  • the anchor plate lies during the valve closing position 3 on the switching magnet 7. If the valve lifter 2 is in the valve opening position the armature plate 3 from the excited switching magnet 8 dressed and held in this position.
  • the spring device 6 has between spring plates 10 and 11 as a resilient element, a coil spring 9a on, the spring plate 10, 11 relative to the valve lifter 2 slidably and coaxially arranged on this are.
  • the valve lifter 2 is through central openings 12, 13 of the spring plate 10, 11 feasible.
  • valve lifter 2 On the valve lifter 2 are each on the coil spring 9a facing away from the spring plate 10, 11th Driving devices 14, 15 for the spring plate 10, 11 arranged.
  • the takeaways are as Ring elements 14, 15 formed, each of which an annulus 16, 17 and a cylindrical sleeve 18, 19 exist.
  • the sockets 18, 19 have central ones Openings 20, 21 through which the valve tappet 2 is feasible for assembly.
  • the inner lateral surfaces 22, 23 of the bushings 18, 19 are as contact surfaces on the valve lifter 2 and the outer lateral surfaces 24, 25 as guide surfaces for the spring plates 10, 11 formed.
  • the webs 30, 31 can as in the embodiment shown over the entire outer diameter of the spring plate 10, 11 extend or segment-like only over a partial area the outer diameter of the spring plate 10, 11th extend.
  • the two spring plates 10, 11 are in the de-energized state of the electromagnet system 5 just on path limiting devices 32, 33 and on the ring elements 14, 15 on, so that the valve lifter 2 in a subsequent Opening or closing the valve without delay be moved to the required position can.
  • valve lifter 2 by means of the solenoid 7 brought into the closed position of the valve plate 4 the ring element 15 with the valve tappet 2 moved such that the ring member 15 the spring plate 11 lifts off the path limiting device 33 and compresses the resilient member 9a.
  • the spring plate 10 is against the coil spring 9a Travel limiting device 32 pressed, and the ring element 14 lifts off the spring plate 10.
  • the ring member 14th moved with the valve lifter 2 such that the ring element 14 the spring plate 10 from the travel limiting device 32 lifts off and compresses the coil spring 9a.
  • the spring plate 11 is from the coil spring 9a pressed against the path limiting device 33, and the ring element 15 lifts off from the spring plate 11.
  • the path limitation devices are in the present Embodiment as paragraphs 32, 33 in the cylinder head 1 trained and can in another not shown embodiment also by other suitable components such as stop elements, which are attached to the cylinder head 1 can be formed.
  • the outer surface 24, 25, which coaxial to in the present embodiment an outer lateral surface 34 of the valve lifter 2 be conical. It becomes self-centering the spring plate 10, 11 on the ring elements 14, 15 reached.
  • the coil spring 9a rests with its spring ends the inside of the valve stem 2 facing Webs 30, 31, whereby lateral guidance of the Coil spring 9a is guaranteed.
  • the device is the resilient element as one pneumatic spring or air spring 9b formed.
  • the air spring 9b is between the pistons 10, 11 trained spring plates and the cylinder head 1 arranged, being in the cylinder head 1 in the range between the pistons 10 and 11 a compressed air supply line 35 is provided, which the air spring 9b with compressed air provided.
  • the cylindrical bushes 18, 19 are integral with the piston 10, 11 formed, being on the inner lateral surfaces 22, 23 a groove 36 is provided in each case, in which an O-ring 37 of a sealing device 38 is arranged.
  • the ring elements 14, 15 lie with the each facing the associated piston 10, 11 Front side of the pistons 10, 11.
  • the pistons 10, 11 are in the assembled state passed over the valve lifter 2 and slidable there arranged.
  • the webs 30, 31 are formed on the pistons 10, 11 and the air spring on each of them 9b facing sides.
  • the webs 30, 31 run over the entire outer diameter the pistons 10, 11 and 12 respectively on its outside 39 a groove 40 in which for Sealing on the cylinder head 1 or a valve housing an O-ring 41 of a sealing device 42 is provided is.
  • the outer sides 39 of the webs 30, 31 serve on the one hand as guide surfaces of the pistons 10, 11 in the cylinder head 1 and on the other hand for recording the sealing device 42.
  • the two pistons 10, 11 are de-energized of the electromagnet system 5 just at the path limiting devices 32, 33 and on the ring elements 14, 15 on.
  • valve lifter 2 by means of the solenoid 7 brought into the closed position of the valve plate 4 the ring element 15 with the valve tappet 2 moved such that the ring member 15 the piston 11 from the path limiting device 33 and the Compress air spring 9b.
  • the piston 10 is from the air spring 9b against the travel limiting device 32 pressed, and the ring member 14 lifts from the piston 10 from.
  • the ring member 14th moved with the valve lifter 2 such that the ring element 14 the piston 10 from the travel limiting device 32 lifts off and compresses the air spring 9b.
  • the piston 11 is from the air spring 9b to the travel limiting device 33 pressed, and the ring member 15 lifts off the piston 11.
  • the path limiting device 33 is in the present Embodiment formed as a paragraph, which is provided in the cylinder head 1, and the Travel limiting device 32 is by the switching magnet 8 formed.
  • the one for sealing the air spring 9b between the pistons 10, 11 and the valve lifter 2 and the cylinder head 1 arranged sealing devices 38, 42, have the O-rings in the present embodiment 37, 41 as a sealing body, but it goes without saying Others are at the discretion of the professional to use suitable sealing options, which two components slidably arranged relative to each other Seal against air or gas passage.
  • the air spring 9b has compared to conventional coil springs Advantages, such as a negligible Spring mass and the possibility of the spring characteristic by varying the pressure or the spring volume to be able to change during operation. Because air springs generally have a progressive spring characteristic can have movements in particular be advantageously damped.
  • the spring characteristic can be determined using a not shown control device as a function of Engine speed and engine load and other operating parameters the internal combustion engine or only under consideration one of the operating parameters is set be, thereby reducing fuel consumption and starting behavior of the motor vehicle can be improved.
  • Another advantage of the air spring 9b is a small axial installation space, which saves weight enables and thus also fuel consumption lowers.
  • the valve control also has a low level static mass, which means shorter response times Control device can be realized.
  • valve If the valve is switched off, or in closing or in It is possible to leave it in the open position to vent the air spring 9b. That means the pressure between the pistons 10, 11 is degraded, with which the holding current of the switching magnets 7, 8 and the energy consumption lets lower.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)

Description

Die Erfindung betrifft eine Vorrichtung für eine elektromagnetische Ventilsteuerung nach der im Oberbegriff von Anspruch 1 näher definierten Art.The invention relates to a device for an electromagnetic Valve control according to that in the preamble Art defined by claim 1.

Aus der DE 33 07 070 C2 (oder EP-A-0 722 039) ist eine Stelleinrichtung für ein Gaswechselventil einer Brennkraftmaschine bekannt. In dieser Stelleinrichtung ist ein Elektromagnet-System mit Schaltmagneten angeordnet, wobei bei entregtem Elektromagnet-System eine Ankerplatte in einer neutralen Stellung liegt. Darüber hinaus ist ein schwingungsfähiges Feder-Masse-System mit zwei Federn, welche beidseitig der Ankerplatte angeordnet sind, vorhanden.DE 33 07 070 C2 (or EP-A-0 722 039) describes an adjusting device for a gas exchange valve of an internal combustion engine is known. In this control device is an electromagnet system arranged with switching magnets, with deenergized electromagnet system an anchor plate in in a neutral position. In addition, is a oscillating spring-mass system with two springs, which are arranged on both sides of the anchor plate, available.

Nachteilig ist dabei jedoch, daß die Federn des Feder-Masse-Systems unter Vorspannung eingebaut werden, und daß bei Schaltvorgängen der Stelleinrichtung potentielle Energie von einer Feder auf die andere übertragen wird. Darüber hinaus werden aufgrund der Vorspannkraft größer dimensionierte Federn benötigt. The disadvantage, however, is that the springs of the spring-mass system be installed under tension, and that potential switching operations of the actuator Transferring energy from one spring to the other becomes. In addition, due to the preload Larger springs are required.

Der vorliegenden Erfindung liegt daher die Aufgabe zugrunde, eine Vorrichtung für eine elektromagnetische Ventilsteuerung zu schaffen, bei der bei entregtem Elektromagnet-System eine neutrale Position eines Schaltelementes unabhängig von einer Federkonstanten vorliegt und bei der der Aufwand für das Federsystem gering ist.The present invention is therefore based on the object based on a device for an electromagnetic To create valve control, when de-energized Electromagnet system a neutral position Switching element independent of a spring constant is present and in which the effort for the spring system is low.

Erfindungsgemäß wird diese Aufgabe durch die im kennzeichnenden Teil von Anspruch 1 genannten Merkmale gelöst.According to the invention, this task is characterized by Features mentioned in claim 1 solved.

Durch die erfindungsgemäße Anordnung einer Federeinrichtung, welche zwei Federteller und ein federndes Element aufweist, wobei die Federteller in entregtem Zustand eines Elektromagnet-Systems an Wegbegrenzungseinrichtungen anliegen, ist eine genau definierbare und von einer Federkonstanten unabhängige neutrale Position eines Ventilstößels erreichbar.Due to the arrangement of a spring device according to the invention, which two spring plates and a springy one Has element, the spring plate in de-excited State of an electromagnet system at travel limitation devices is a precisely definable one and neutral independent of a spring constant Position of a valve lifter accessible.

Des weiteren ist von Vorteil, daß bei der vorliegenden Erfindung nur noch ein einziges federndes Element benötigt wird, so daß die Federeinrichtung in ihren Abmessungen kleiner dimensioniert werden kann als die aus dem Stand der Technik bekannten. Daraus ergibt sich zum einen eine Kostenersparnis in der Fertigung und zum anderen eine Gewichtsersparnis, welche wiederum einen Beitrag zur Verminderung des Kraftstoffverbrauches leistet.Another advantage is that in the present Invention only needs a single resilient element is so that the spring device in its dimensions can be dimensioned smaller than that known from the prior art. It follows on the one hand, a cost saving in production and on the other hand a weight saving, which in turn a contribution to reducing fuel consumption accomplishes.

Vorteilhafte Weiterbildungen und Ausgestaltungen der Erfindung ergeben sich aus den Unteransprüchen und aus den nachfolgend anhand der Zeichnung prinzipmäßig beschriebenen Ausführungsbeispielen. Advantageous further developments and refinements of Invention result from the dependent claims and from the principle described below with reference to the drawing Embodiments.

In der Zeichnung sind zwei Ausführungsformen einer Vorrichtung für eine elektromagnetische Ventilsteuerung dargestellt, welche in einem Zylinderkopf angeordnet und grundsätzlich von bekannter Bauart sind, weshalb nachfolgend nur auf die für die Erfindung wesentlichen Teile näher eingegangen wird.In the drawing, two embodiments are one Device for an electromagnetic valve control shown, which are arranged in a cylinder head and are basically of a known type, which is why only the essential for the invention Parts will be discussed in more detail.

Es zeigt:

Fig. 1
eine Vorrichtung für eine elektromagnetische Ventilsteuerung mit einer Federeinrichtung, welche ein federndes Element aufweist, das als eine Schraubenfeder ausgebildet ist;
Fig. 2
ein weiteres Ausführungsbeispiel der Vorrichtung in geöffneter Stellung, wobei ein federndes Element als eine Luftfeder ausgebildet ist;
Fig. 3
die Vorrichtung gemäß Fig. 2 in neutraler Stellung; und
Fig. 4
die Vorrichtung gemäß Fig. 2 und Fig. 3 in geschlossener Stellung.
It shows:
Fig. 1
a device for an electromagnetic valve control with a spring device, which has a resilient element which is designed as a helical spring;
Fig. 2
a further embodiment of the device in the open position, wherein a resilient element is designed as an air spring;
Fig. 3
the device of Figure 2 in a neutral position. and
Fig. 4
the device of FIG. 2 and FIG. 3 in the closed position.

In der Fig. 1 ist ein in einem Zylinderkopf 1 angeordneter Ventilstößel 2 mit einer Ankerplatte 3 und einem Ventilteller 4, der mit einem Ventilsitz im Zylinderkopf 1 zusammenwirkt, dargestellt. Die Ankerplatte 3 ist an dem dem Ventilteller 4 gegenüberliegenden Ende des Ventilstößels 2 mit diesem verbunden.1 is arranged in a cylinder head 1 Valve tappet 2 with an anchor plate 3 and one Valve plate 4, which has a valve seat in the cylinder head 1 interacts, shown. The anchor plate 3 is at the end opposite the valve plate 4 of the valve lifter 2 connected to it.

Der Ventilstößel 2 ist in dem Zylinderkopf 1 derart verschieblich angeordnet, daß die Ankerplatte 3 und damit der Ventilstößel 2 abhängig von dem Erregungszustand eines Elektromagnet-Systems 5 in einer Ventilöffnungsstellung oder Ventilschließstellung gehalten werden kann.The valve lifter 2 is in the cylinder head 1 slidably arranged that the anchor plate 3 and thus the valve lifter 2 depending on the state of excitation of an electromagnet system 5 in a valve opening position or valve closed position maintained can be.

In entregtem Zustand des Elektromagnet-Systems 5 wird der Ventilstößel 2 mittels einer Federeinrichtung 6 in einer neutralen Position gehalten, wobei die Ankerplatte 3 eine annähernd mittige Position zwischen zwei Schaltmagneten 7, 8 einnimmt.In the de-energized state of the electromagnet system 5 the valve lifter 2 by means of a spring device 6 in held in a neutral position with the anchor plate 3 an approximately central position between two Switching magnet 7, 8 occupies.

Während der Ventilschließstellung liegt die Ankerplatte 3 an dem Schaltmagneten 7 an. Wenn sich der Ventilstößel 2 in Ventilöffnungsstellung befindet, wird die Ankerplatte 3 von dem erregten Schaltmagneten 8 angezogen und in dieser Position gehalten.The anchor plate lies during the valve closing position 3 on the switching magnet 7. If the valve lifter 2 is in the valve opening position the armature plate 3 from the excited switching magnet 8 dressed and held in this position.

Die Federeinrichtung 6 weist zwischen Federtellern 10 und 11 als federndes Element eine Schraubenfeder 9a auf, wobei die Federteller 10, 11 relativ zu dem Ventilstößel 2 verschiebbar und koaxial an diesem angeordnet sind. Der Ventilstößel 2 ist durch mittige Öffnungen 12, 13 der Federteller 10, 11 führbar.The spring device 6 has between spring plates 10 and 11 as a resilient element, a coil spring 9a on, the spring plate 10, 11 relative to the valve lifter 2 slidably and coaxially arranged on this are. The valve lifter 2 is through central openings 12, 13 of the spring plate 10, 11 feasible.

An dem Ventilstößel 2 sind jeweils auf der der Schraubenfeder 9a abgewandten Seite der Federteller 10, 11 Mitnahmeeinrichtungen 14, 15 für die Federteller 10, 11 angeordnet. Die Mitnahmeeinrichtungen sind als Ringelemente 14, 15 ausgebildet, welche jeweils aus einem Kreisring 16, 17 und einer zylindrischen Buchse 18, 19 bestehen. Die Buchsen 18, 19 weisen mittige Öffnungen 20, 21 auf, durch welche der Ventilstößel 2 zur Montage führbar ist. On the valve lifter 2 are each on the coil spring 9a facing away from the spring plate 10, 11th Driving devices 14, 15 for the spring plate 10, 11 arranged. The takeaways are as Ring elements 14, 15 formed, each of which an annulus 16, 17 and a cylindrical sleeve 18, 19 exist. The sockets 18, 19 have central ones Openings 20, 21 through which the valve tappet 2 is feasible for assembly.

Die Innenmantelflächen 22, 23 der Buchsen 18, 19 sind als Anlageflächen an dem Ventilstößel 2 und die Außenmantelflächen 24, 25 als Führungsflächen für die Federteller 10, 11 ausgebildet.The inner lateral surfaces 22, 23 of the bushings 18, 19 are as contact surfaces on the valve lifter 2 and the outer lateral surfaces 24, 25 as guide surfaces for the spring plates 10, 11 formed.

Darüber hinaus sind an den Innenmantelflächen 22, 23 Auswölbungen bzw. Nippel 26, 27 vorgesehen, welche in Nuten 28, 29 des Ventilstößels 2 eingepaßt werden, womit die Ringelemente 14, 15 in einer bestimmten Position an dem Ventilstößel 2 fixierbar sind.In addition, on the inner lateral surfaces 22, 23 Bulges or nipples 26, 27 provided in Grooves 28, 29 of the valve lifter 2 are fitted, with which the ring elements 14, 15 in a certain position are fixable on the valve lifter 2.

In zusammengebautem Zustand sind die Federteller 10, 11 über die zylindrischen Buchsen 18, 19 der Ringelemente 16, 17 geführt und dort verschiebbar angeordnet. Um eine Führung der Federteller 10, 11 an den Buchsen 18, 19 zu gewährleisten, ist die Höhe der Buchsen 18, 19 größer als der maximale Verschiebeweg der Federteller 10, 11 bzw. der gesamte Verstellweg des Ventilstößels 2 von der Schließstellung bis zu der Öffnungsstellung des Ventiltellers 4.In the assembled state, the spring plates 10, 11 via the cylindrical bushes 18, 19 of the ring elements 16, 17 guided and slidably arranged there. To guide the spring plate 10, 11 on the bushings 18, 19 to ensure the height of the bushings 18, 19 larger than the maximum displacement of the spring plate 10, 11 or the entire adjustment path of the valve lifter 2 from the closed position to the open position the valve plate 4.

An den Federtellern 10, 11 ist an ihrer jeweils der Schraubenfeder 9a zugewandten Seiten ein Steg 30, 31 ausgebildet. Die Stege 30, 31 können wie in dem Ausführungsbeispiel gemäß Fig. 1 dargestellt über den gesamten Außendurchmesser der Federteller 10, 11 verlaufen oder sich segmentartig nur über einen Teilbereich der äußeren Durchmesser der Federteller 10, 11 erstrecken.On the spring plates 10, 11 is on each of them Coil spring 9a facing sides a web 30, 31st educated. The webs 30, 31 can as in the embodiment shown over the entire outer diameter of the spring plate 10, 11 extend or segment-like only over a partial area the outer diameter of the spring plate 10, 11th extend.

Die beiden Federteller 10, 11 liegen in entregtem Zustand des Elektromagnet-Systems 5 eben an Wegbegrenzungseinrichtungen 32, 33 und an den Ringelementen 14, 15 an, so daß der Ventilstößel 2 bei einem anschließenden Öffnen oder Schließen des Ventiles ohne Verzögerung in die dafür notwendige Position bewegt werden kann.The two spring plates 10, 11 are in the de-energized state of the electromagnet system 5 just on path limiting devices 32, 33 and on the ring elements 14, 15 on, so that the valve lifter 2 in a subsequent Opening or closing the valve without delay be moved to the required position can.

Wenn der Ventilstößel 2 mittels des Schaltmagneten 7 in die Schließposition des Ventiltellers 4 gebracht wird, wird das Ringelement 15 mit dem Ventilstößel 2 derart verschoben, daß das Ringelement 15 den Federteller 11 von der Wegbegrenzungseinrichtung 33 abhebt und das federnde Element 9a zusammendrückt. Der Federteller 10 wird von der Schraubenfeder 9a gegen die Wegbegrenzungseinrichtung 32 gedrückt, und das Ringelement 14 hebt von dem Federteller 10 ab.If the valve lifter 2 by means of the solenoid 7 brought into the closed position of the valve plate 4 the ring element 15 with the valve tappet 2 moved such that the ring member 15 the spring plate 11 lifts off the path limiting device 33 and compresses the resilient member 9a. The spring plate 10 is against the coil spring 9a Travel limiting device 32 pressed, and the ring element 14 lifts off the spring plate 10.

Wird der Ventilstößel 2 in eine Öffnungsposition des Ventiltellers 4 verschoben, wird das Ringelement 14 mit dem Ventilstößel 2 derart verschoben, daß das Ringelement 14 den Federteller 10 von der Wegbegrenzungseinrichtung 32 abhebt und die Schraubenfeder 9a zusammendrückt. Der Federteller 11 wird von der Schraubenfeder 9a an die Wegbegrenzungseinrichtung 33 gedrückt, und das Ringelement 15 hebt von dem Federteller 11 ab.If the valve lifter 2 in an open position of the Valve plates 4 moved, the ring member 14th moved with the valve lifter 2 such that the ring element 14 the spring plate 10 from the travel limiting device 32 lifts off and compresses the coil spring 9a. The spring plate 11 is from the coil spring 9a pressed against the path limiting device 33, and the ring element 15 lifts off from the spring plate 11.

Die Wegbegrenzungseinrichtungen sind in dem vorliegenden Ausführungsbeispiel als Absätze 32, 33 in dem Zylinderkopf 1 ausgebildet und können in einer weiteren nicht näher dargestellten Ausführungsform auch durch andere geeignete Bauteile wie beispielsweise Anschlagelemente, die an dem Zylinderkopf 1 befestigt werden können, gebildet sein.The path limitation devices are in the present Embodiment as paragraphs 32, 33 in the cylinder head 1 trained and can in another not shown embodiment also by other suitable components such as stop elements, which are attached to the cylinder head 1 can be formed.

In einer weiteren nicht näher dargestellten Ausführungsform können die Außenmantelflächen 24, 25, welche bei dem vorliegenden Ausführungsbeispiel koaxial zu einer Außenmantelfläche 34 des Ventilstößels 2 liegen, kegelförmig ausgebildet sein. Damit wird eine Selbstzentrierung der Federteller 10, 11 an den Ringelementen 14, 15 erreicht.In a further embodiment, not shown can the outer surface 24, 25, which coaxial to in the present embodiment an outer lateral surface 34 of the valve lifter 2, be conical. It becomes self-centering the spring plate 10, 11 on the ring elements 14, 15 reached.

Die Schraubenfeder 9a liegt mit ihren Federenden an den dem Ventilstößel 2 zugewandten Innenseiten der Stege 30, 31 an, wodurch eine seitliche Führung der Schraubenfeder 9a gewährleistet ist.The coil spring 9a rests with its spring ends the inside of the valve stem 2 facing Webs 30, 31, whereby lateral guidance of the Coil spring 9a is guaranteed.

In der in den Fig. 2 bis 4 dargestellten Ausführungsform der Vorrichtung ist das federnde Element als eine pneumatische Feder bzw. Luftfeder 9b ausgebildet.In the embodiment shown in FIGS. 2 to 4 the device is the resilient element as one pneumatic spring or air spring 9b formed.

Das in den Figuren 2 bis 4 dargestellte Ausführungsbeispiel ist grundsätzlich von gleichem Aufbau wie das in Fig. 1 dargestellte, weshalb für gleiche Teile auch die gleichen Bezugszeichen beibehalten worden sind.The embodiment shown in Figures 2 to 4 is basically of the same structure as that shown in Fig. 1, which is why for the same parts the same reference numbers have been retained.

Die Luftfeder 9b ist zwischen den als Kolben 10, 11 ausgebildeten Federtellern und dem Zylinderkopf 1 angeordnet, wobei in dem Zylinderkopf 1 im Bereich zwischen den Kolben 10 und 11 eine Druckluftzuleitung 35 vorgesehen ist, welche die Luftfeder 9b mit Druckluft versorgt.The air spring 9b is between the pistons 10, 11 trained spring plates and the cylinder head 1 arranged, being in the cylinder head 1 in the range between the pistons 10 and 11 a compressed air supply line 35 is provided, which the air spring 9b with compressed air provided.

Die zylindrischen Buchsen 18, 19 sind einstückig mit den Kolben 10, 11 ausgebildet, wobei an den Innenmantelflächen 22, 23 jeweils eine Nut 36 vorgesehen ist, in welcher ein O-Ring 37 einer Dichtungseinrichtung 38 angeordnet ist. Die Ringelemente 14, 15 liegen mit der jeweils dem zugehörigen Kolben 10, 11 zugewandten Stirnseite an den Kolben 10, 11 an. The cylindrical bushes 18, 19 are integral with the piston 10, 11 formed, being on the inner lateral surfaces 22, 23 a groove 36 is provided in each case, in which an O-ring 37 of a sealing device 38 is arranged. The ring elements 14, 15 lie with the each facing the associated piston 10, 11 Front side of the pistons 10, 11.

In zusammengebautem Zustand sind die Kolben 10, 11 über den Ventilstößel 2 geführt und dort verschiebbar angeordnet.The pistons 10, 11 are in the assembled state passed over the valve lifter 2 and slidable there arranged.

An den Kolben 10, 11 sind an ihrer jeweils der Luftfeder 9b zugewandten Seiten die Stege 30, 31 ausgebildet. Die Stege 30, 31 verlaufen über den gesamten Außendurchmesser der Kolben 10, 11 und weisen jeweils an ihrer Außenseite 39 eine Nut 40 auf, in welcher zur Abdichtung an dem Zylinderkopf 1 oder einem Ventilgehäuse ein O-Ring 41 einer Dichtungseinrichtung 42 vorgesehen ist. Die Außenseiten 39 der Stege 30, 31 dienen einerseits als Führungsflächen der Kolben 10, 11 in dem Zylinderkopf 1 und andererseits zur Aufnahme der Dichtungseinrichtung 42.On the pistons 10, 11 are the air spring on each of them 9b facing sides, the webs 30, 31 are formed. The webs 30, 31 run over the entire outer diameter the pistons 10, 11 and 12 respectively on its outside 39 a groove 40 in which for Sealing on the cylinder head 1 or a valve housing an O-ring 41 of a sealing device 42 is provided is. The outer sides 39 of the webs 30, 31 serve on the one hand as guide surfaces of the pistons 10, 11 in the cylinder head 1 and on the other hand for recording the sealing device 42.

Die beiden Kolben 10, 11 liegen in entregtem Zustand des Elektromagnet-Systems 5 eben an den Wegbegrenzungseinrichtungen 32, 33 und an den Ringelementen 14, 15 an.The two pistons 10, 11 are de-energized of the electromagnet system 5 just at the path limiting devices 32, 33 and on the ring elements 14, 15 on.

Wenn der Ventilstößel 2 mittels dem Schaltmagneten 7 in die Schließposition des Ventiltellers 4 gebracht wird, wird das Ringelement 15 mit dem Ventilstößel 2 derart verschoben, daß das Ringelement 15 den Kolben 11 von der Wegbegrenzungseinrichtung 33 abhebt und die Luftfeder 9b zusammendrückt. Der Kolben 10 wird von der Luftfeder 9b gegen die Wegbegrenzungseinrichtung 32 gedrückt, und das Ringelement 14 hebt von dem Kolben 10 ab.If the valve lifter 2 by means of the solenoid 7 brought into the closed position of the valve plate 4 the ring element 15 with the valve tappet 2 moved such that the ring member 15 the piston 11 from the path limiting device 33 and the Compress air spring 9b. The piston 10 is from the air spring 9b against the travel limiting device 32 pressed, and the ring member 14 lifts from the piston 10 from.

Wird der Ventilstößel 2 in eine Öffnungsposition des Ventiltellers 4 verschoben, wird das Ringelement 14 mit dem Ventilstößel 2 derart bewegt, daß das Ringelement 14 den Kolben 10 von der Wegbegrenzungseinrichtung 32 abhebt und die Luftfeder 9b zusammendrückt. Der Kolben 11 wird von der Luftfeder 9b an die Wegbegrenzungseinrichtung 33 gedrückt, und das Ringelement 15 hebt von dem Kolben 11 ab.If the valve lifter 2 in an open position of the Valve plates 4 moved, the ring member 14th moved with the valve lifter 2 such that the ring element 14 the piston 10 from the travel limiting device 32 lifts off and compresses the air spring 9b. The piston 11 is from the air spring 9b to the travel limiting device 33 pressed, and the ring member 15 lifts off the piston 11.

Die Wegbegrenzungseinrichtung 33 ist in dem vorliegenden Ausführungsbeispiel als ein Absatz ausgebildet, welcher in dem Zylinderkopf 1 vorgesehen ist, und die Wegbegrenzungseinrichtung 32 wird durch den Schaltmagneten 8 gebildet.The path limiting device 33 is in the present Embodiment formed as a paragraph, which is provided in the cylinder head 1, and the Travel limiting device 32 is by the switching magnet 8 formed.

Die zur Abdichtung der Luftfeder 9b zwischen den Kolben 10, 11 und dem Ventilstößel 2 sowie dem Zylinderkopf 1 angeordneten Dichtungseinrichtungen 38, 42, weisen im vorliegenden Ausführungsbeispiel die O-Ringe 37, 41 als Dichtkörper auf, wobei es jedoch selbstverständlich im Ermessen des Fachmannes liegt auch andere geeignete Dichtungsmöglichkeiten zu verwenden, welche zwei relativ zueinander verschieblich angeordnete Bauteile gegen Luft- bzw. Gasdurchtritt abdichten.The one for sealing the air spring 9b between the pistons 10, 11 and the valve lifter 2 and the cylinder head 1 arranged sealing devices 38, 42, have the O-rings in the present embodiment 37, 41 as a sealing body, but it goes without saying Others are at the discretion of the professional to use suitable sealing options, which two components slidably arranged relative to each other Seal against air or gas passage.

Die Luftfeder 9b weist gegenüber herkömmlichen Schraubenfedern Vorteile auf, wie beispielsweise eine vernachlässigbare Federmasse und die Möglichkeit die Federkennlinie durch Variation des Druckes oder des Federvolumens während des Betriebes verändern zu können. Da Luftfedern im allgemeinen eine progressive Federkennlinie aufweisen, können Bewegungsabläufe in besonders vorteilhafter Weise gedämpft werden.The air spring 9b has compared to conventional coil springs Advantages, such as a negligible Spring mass and the possibility of the spring characteristic by varying the pressure or the spring volume to be able to change during operation. Because air springs generally have a progressive spring characteristic can have movements in particular be advantageously damped.

Darüber hinaus kann die Federkennlinie mittels einer nicht dargestellten Steuereinrichtung als Funktion der Motordrehzahl und der Motorlast und anderen Betriebsparametern der Brennkraftmaschine bzw. nur unter Berücksichtigung einer der Betriebsparameter eingestellt werden, wodurch der Treibstoffverbrauch und das Startverhalten des Kraftfahrzeuges verbessert werden kann.In addition, the spring characteristic can be determined using a not shown control device as a function of Engine speed and engine load and other operating parameters the internal combustion engine or only under consideration one of the operating parameters is set be, thereby reducing fuel consumption and starting behavior of the motor vehicle can be improved.

Als weiterer Vorteil der Luftfeder 9b ergibt sich ein geringer axialer Bauraum, der eine Gewichtsersparnis ermöglicht und damit auch den Kraftstoffverbrauch senkt. Ebenso weist die Ventilsteuerung eine geringe statische Masse auf, womit kürzere Ansprechzeiten der Steuereinrichtung realisierbar sind.Another advantage of the air spring 9b is a small axial installation space, which saves weight enables and thus also fuel consumption lowers. The valve control also has a low level static mass, which means shorter response times Control device can be realized.

Ein zusätzlicher Vorteil ist in der reduzierten Reibung der Luftfeder 9b während des Betriebes gegeben, da geringere Schaltkräfte zur Betätigung des Ventilstößels 2 erforderlich sind und die Wärmeentwicklung durch Reibung in vorteilhafter Weise vermindert wird.An additional advantage is the reduced friction given the air spring 9b during operation, because lower switching forces for actuating the valve lifter 2 are required and heat generation reduced by friction in an advantageous manner becomes.

Wird das Ventil abgeschaltet, bzw. in Schließ- oder in geöffneter Position belassen, besteht die Möglichkeit die Luftfeder 9b zu entlüften. Das bedeutet, der Druck zwischen den Kolben 10, 11 wird abgebaut, womit sich der Haltestrom der Schaltmagnete 7, 8 bzw. der Energieverbrauch senken läßt.If the valve is switched off, or in closing or in It is possible to leave it in the open position to vent the air spring 9b. That means the pressure between the pistons 10, 11 is degraded, with which the holding current of the switching magnets 7, 8 and the energy consumption lets lower.

Claims (12)

  1. Device for electromagnetic valve control, whereby an anchor plate, which is movable between two final positions, in which it is held by an electromagnetic system with switching magnets, is connected to a valve stem, and whereby a spring device with a spring element is provided on the valve stem such that the anchor plate takes up an approximately middle position, between the two switching magnets, when the electromagnetic system is not energized,
    characterized in that the spring element (9a, 9b) is disposed between two spring caps (10, 11) which have openings (12, 13) in them, and in that the valve stem (2) and the spring caps (10, 11) are disposed such that they can be moved in relation to the each other, and in that, on the side of the spring caps (10, 11) which faces away from the spring element (9a, 9b), a carrier arrangement (14, 15) is in each case provided on the valve stem (2), and a path-limiting mechanism (32, 33) is provided for each of the spring caps (10, 11).
  2. Device in accordance with claim 1,
    characterized in that the valve stem (2) is provided with two carrier arrangements (14, 15) which each form an abutment means, on the side of the spring caps (10, 11) which face away from the spring element (9a, 9b), for the relevant spring cap (10, 11).
  3. Device in accordance with claim 1 or 2,
    characterized in that the carrier arrangements are developed as annular elements (14, 15) which have openings (20, 21) in them, through which the valve stem (2) can be placed, whereby a sleeve (18, 19) is developed, on each of the openings (20, 21), the inner surfaces (22, 23) of which are developed as a contact surface for the valve stem (2), and the outer surfaces (24, 25) of which are developed as a guide surface for the spring caps (10, 11).
  4. Device in accordance with claim 3,
    characterized in that concavities or nipples (26, 27) are provided, on the inner surfaces (22, 23) of the annular elements (14, 15), which can be introduced into grooves (28, 29) in the valve stem (2).
  5. Device in accordance with claim 3 or 4,
    characterized in that the outer surfaces (24, 25) of the sleeves (18, 19) are conical in form.
  6. Device in accordance with any one of claims 1 to 5,
    characterized in that the spring caps (10, 11) each have a fillet (30, 31) which extends over a partial area of their outer diameters.
  7. Device in accordance with any one of claims 1 to 6,
    characterized in that the path-limiting mechanisms are developed as shoulders (32, 33) in a cylinder head (1).
  8. Device in accordance with any one of claims 1 to 7,
    characterized in that the spring element is formed as a helical spring (9a).
  9. Device in accordance with claim 8,
    characterized in that the helical spring (9a) lies on the side of the spring caps (10, 11) which faces the helical spring (9a), and on the inner sides of the fillets (30, 31).
  10. Device in accordance with any one of claims 1 to 7,
    characterized in that the spring element is developed as a pneumatic spring (9b) and the spring caps are developed as pistons (10, 11).
  11. Device in accordance with claim 10,
    characterized in that a pressurized-air feed (35) is provided in the cylinder head (1), in the area between the spring caps (10, 11).
  12. Device in accordance with claim 10 or 11,
    Characterized in that a sealing arrangement (38, 42) is disposed in each case between the spring caps (10, 11) and the valve stem (2) and also the cylinder head (1).
EP98101234A 1997-02-27 1998-01-24 Device for an electromagnetic valve control Expired - Lifetime EP0861970B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19707810 1997-02-27
DE19707810A DE19707810C1 (en) 1997-02-27 1997-02-27 Electromagnetic valve control device

Publications (2)

Publication Number Publication Date
EP0861970A1 EP0861970A1 (en) 1998-09-02
EP0861970B1 true EP0861970B1 (en) 2001-06-06

Family

ID=7821618

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98101234A Expired - Lifetime EP0861970B1 (en) 1997-02-27 1998-01-24 Device for an electromagnetic valve control

Country Status (4)

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US (1) US6062181A (en)
EP (1) EP0861970B1 (en)
DE (2) DE19707810C1 (en)
ES (1) ES2159413T3 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19725010C1 (en) * 1997-06-13 1998-10-29 Daimler Benz Ag Device for actuating a gas exchange valve with an electromagnetic actuator
FR2783631B1 (en) * 1998-09-18 2000-11-24 Sagem ELECTROMAGNETIC ACTUATOR, ESPECIALLY FOR VALVE
DE10008991A1 (en) * 2000-02-25 2001-08-30 Bayerische Motoren Werke Ag Gas exchange valve regulation with electromagnetic actuator for IC engines has armature separating gas springs and defining damper chamber in holding position on magnet
US7603858B2 (en) * 2007-05-11 2009-10-20 Lawrence Livermore National Security, Llc Harmonic engine
US8807012B1 (en) 2010-08-30 2014-08-19 Lawrence Livermore National Security, Llc Harmonic engine
US9291056B2 (en) 2010-08-30 2016-03-22 Lawrence Livermore National Security, Llc Harmonic uniflow engine

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3307070C2 (en) * 1983-03-01 1985-11-28 FEV Forschungsgesellschaft für Energietechnik und Verbrennungsmotoren mbH, 5100 Aachen Setting device for a switching element that can be adjusted between two end positions
DE3616540A1 (en) * 1986-05-16 1987-11-19 Porsche Ag DEVICE FOR ACTUATING A GAS EXCHANGE VALVE OF A PISTON PISTON COMBUSTION ENGINE
JP3106890B2 (en) * 1995-01-11 2000-11-06 トヨタ自動車株式会社 Valve drive for internal combustion engine

Also Published As

Publication number Publication date
EP0861970A1 (en) 1998-09-02
US6062181A (en) 2000-05-16
ES2159413T3 (en) 2001-10-01
DE59800812D1 (en) 2001-07-12
DE19707810C1 (en) 1998-05-07

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