EP1334263B1 - Internal combustion engine comprising an electromagnetic actuator which is situated on a cylinder head - Google Patents

Internal combustion engine comprising an electromagnetic actuator which is situated on a cylinder head Download PDF

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Publication number
EP1334263B1
EP1334263B1 EP01996673A EP01996673A EP1334263B1 EP 1334263 B1 EP1334263 B1 EP 1334263B1 EP 01996673 A EP01996673 A EP 01996673A EP 01996673 A EP01996673 A EP 01996673A EP 1334263 B1 EP1334263 B1 EP 1334263B1
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EP
European Patent Office
Prior art keywords
engine according
actuator
cylinder head
electromagnet
valve
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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EP01996673A
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German (de)
French (fr)
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EP1334263A1 (en
Inventor
Andreas Donner
Helmut Kellermann
Johannes Denteler
Johannes Meyer
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Bayerische Motoren Werke AG
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Bayerische Motoren Werke AG
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Publication of EP1334263A1 publication Critical patent/EP1334263A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
    • F01L9/20—Valve-gear or valve arrangements actuated non-mechanically by electric means

Definitions

  • the invention relates to an internal combustion engine with an electromagnetic actuator arranged on a cylinder head according to the preamble of claim 1.
  • An actuator according to the prior art is known from DE 197 12 669 A1.
  • an electromagnet between two axially spaced, formed on the valve lifter anchors is arranged.
  • a coil core of the electromagnet has one or more pole faces on the respective sides facing the anchors.
  • a force acting on the respective nearest armature predominates.
  • in conjunction with the dynamics of the actuator can be achieved by an alternating interruption and energization of the exciter circuit reciprocating the actuator and thus opening and closing the gas exchange valve coupled thereto.
  • the problem with the arrangement of such actuators on the cylinder heads is the overall height. If the actuators are too high, space problems can arise in the engine compartment. In particular, there may be problems with the assembly of the vehicle and the entry of the engine into the engine compartment.
  • a cavity is formed in the cylinder head, in which a part of the actuator is received.
  • This part is the actuator part projecting beyond the electromagnet, the electromagnet lying between the anchors at least partially delimiting the said cavity on the actuator side in the region of the connection plane between the actuator and the cylinder head. Due to the formation of said cavity and thus becoming possible shift of Aktor turnover in the cavity and thus in the direction of the cylinder height can be reduced significantly, resulting in total - especially taking into account a variety of actuators to be mounted - to a more compact internal combustion engine ,
  • a favorable heat dissipation can be achieved by a direct placement of the electromagnet on the cylinder head, so that the actuator is easy to cool.
  • the armature shaft is mounted in the electromagnet itself. Thus, it is only important to fix the electromagnet relative to the cylinder head.
  • the armature shaft of the actuator can be indirectly or directly coupled to the valve stem of the valve, for example with the interposition of a valve clearance compensation element.
  • valve spring can bias the valve to an end position, such as the closed position.
  • the valve spring is supported on the one hand on the valve stem and on the other hand on the cylinder head. This allows a simple installation of the valve.
  • a second spring can be integrated in the actuator and arranged cylinder head with respect to the electromagnet.
  • the simple structure of this embodiment is promoted when this Aktorfeder is supported directly against the cylinder head distant anchor.
  • By a screw device by means of the actuator spring is held by a spring seat, also an adjustment of the actuator, in particular the two anchor plates, in relation to its position to the electromagnet can be performed.
  • the electromagnet may consist of a coil core with one or more pole faces, as is known for example from DE 197 12 669 A1.
  • the actuator 10 comprises an electromagnet 12, which in the present case is shown only as a unit.
  • the electromagnet 12 may comprise one or more pole faces on the sides facing the respective anchors and one or more coils.
  • two bearings 15 are formed coaxially with a central bore at both end regions, which hold an armature shaft 14 movably guided in the axial direction.
  • the armature plate 16 is smaller than the armature plate 18.
  • the electromagnet 12 is accommodated in a housing 20 in such a way that, together with the housing 20, it essentially limits the actuator on the side of the small armature plate 16.
  • the anchor plate 16 is together with the protruding on this side anchor shaft 14 via the volume limited by the electromagnet 12 and the housing 20.
  • a coaxial with the bore in the electromagnet 12 aligned bore is formed with an internal thread into which a screw 26 is screwed.
  • the screwing device 26 also forms a spring seat for an actuator spring 22, which is supported on the one hand against this spring seat and on the other hand against a directly on the anchor plate 18 arranged valve seat.
  • the actuator spring 22 serves for biasing the gas exchange valve in the open position and is compressed in the presently illustrated embodiment.
  • the Einschraubvorraum 26 also includes a central, stepped bore into which a displacement sensor 28 (not shown in detail here) is inserted.
  • the displacement sensor 28 in turn comprises a central bore arranged coaxially with the cylinder bore, through which extends an extension of the armature shaft 14.
  • the reference numeral 23 denotes a so-called oil gallery. This is a supply line for lubricating oil, which ends in the region of the upper anchor plate 18 and ensures minimal lubrication by dropwise addition of lubricating oil.
  • a cylinder head 50 of the internal combustion engine is formed in the region of each valve with a recess (cavity) 58, in which the actuator part (armature plate 16 and armature shaft 14) protruding above the housing 20 and electromagnet 12 is accommodated.
  • the valve 52 is mounted in the cylinder head and is opposite to the actuator 12 in the cavity 58 inside.
  • valve spring 54 At the upper end of the valve 52, a spring seat 56 is arranged, against which a further springs, namely the valve spring 54, is supported.
  • valve spring 54 is supported against a spring seat directly on the cylinder head and biases the valve in its closed direction.
  • valve clearance compensation element At the upper end of the valve not shown in detail valve clearance compensation element is provided.
  • the anchor plate 16 is now introduced together with the armature shaft 14 in the cavity 58 such that the front end of the armature shaft comes to rest on the valve stem of the gas exchange valve already arranged therein with the interposition of the valve lash adjuster. This results in a coupling between the actuator 10 and the valve 52.
  • an anchor position is reached, in which the electromagnet is approximately between the two anchor plates 16 and 18 to lie (not shown here). This represents the rest position.
  • asymmetrical choice of the two anchor plates 16 and 18 can be achieved by energizing the electromagnet when swinging an initial deflection, so that it finally at subsequent, suitable, alternating energization and Stromloswolf of the electromagnet to a Hin - And swinging of existing from anchor, valve and valve spring spring mass system comes.
  • the lower armature plate 16 moves back and forth in the cavity.
  • Both armatures 16, 18 can be held in their respective, near-end electromagnetic positions by continuous energization.
  • the cavity is mainly limited by the electromagnet actuator side.
  • valve or actuator elements in the cavity 58, a particularly small-sized unit of cylinder head and actuators can be achieved, which is the aim of the present invention.
  • the electromagnet 12 is located at least at its edge regions directly on the cylinder head, which is always well cooled.

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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 Brennkraftmaschine mit einem elektromagnetischen, auf einem Zylinderkopf angeordneten Aktor gemäß dem Oberbegriff des Anspruchs 1.The invention relates to an internal combustion engine with an electromagnetic actuator arranged on a cylinder head according to the preamble of claim 1.

Ein Aktor gemäß dem Stand der Technik ist aus der DE 197 12 669 A1 bekannt. Dabei ist ein Elektromagnet zwischen zwei axial beabstandeten, am Ventilstößel ausgebildeten Ankern angeordnet. Ein Spulenkern des Elektromagneten weist an den jeweiligen, den Ankern zugewandten Seiten eine oder mehrere Polflächen auf. Bei einer Bestromung des Elektromagneten überwiegt eine auf den jeweiligen, nächstliegenden Anker einwirkende Kraft. Insbesondere im Zusammenspiel mit der Dynamik des Aktors lässt sich durch eine abwechselnde Unterbrechung und Bestromung des Erregerstromkreises ein Hin- und Herbewegen des Aktors und somit ein Öffnen und Schließen des damit gekoppelten Gaswechselventils erreichen.An actuator according to the prior art is known from DE 197 12 669 A1. In this case, an electromagnet between two axially spaced, formed on the valve lifter anchors is arranged. A coil core of the electromagnet has one or more pole faces on the respective sides facing the anchors. When the electromagnet is energized, a force acting on the respective nearest armature predominates. In particular, in conjunction with the dynamics of the actuator can be achieved by an alternating interruption and energization of the exciter circuit reciprocating the actuator and thus opening and closing the gas exchange valve coupled thereto.

Eine Brennkraftmaschine mit einem Aktor gemäß dem Oberbegriff des Anspruchs 1 ist aus der US 3 882 833 A bekannt.An internal combustion engine with an actuator according to the preamble of claim 1 is known from US 3 882 833 A.

Problematisch bei der Anordnung solcher Aktoren auf den Zylinderköpfen ist jeweils die Gesamtbauhöhe. Bei zu hoch bauenden Aktoren können Platzprobleme im Motorraum entstehen. Insbesondere kann es zu Problemen bei der Montage des Fahrzeugs und dem Einfahren des Motors in den Motorraum kommen.The problem with the arrangement of such actuators on the cylinder heads is the overall height. If the actuators are too high, space problems can arise in the engine compartment. In particular, there may be problems with the assembly of the vehicle and the entry of the engine into the engine compartment.

Aus diesem Grunde ist es Ziel der vorliegenden Erfindung, eine Brennkraftmaschine anzugeben, die in besonderem Maße kompakt aufgebaut ist.For this reason, it is an object of the present invention to provide an internal combustion engine, which is constructed in a particularly compact.

Dieses Ziel wird durch die im Anspruch 1 angegeben Maßnahmen erreicht.This object is achieved by the measures indicated in claim 1.

Erfindungswesentlich ist dabei im Zylinderkopf ein Hohlraum ausgebildet, in dem ein Teil des Aktors aufgenommen ist. Bei diesem Teil handelt es sich um den über den Elektromagneten vorstehenden Aktorteil, wobei der zwischen den Ankern liegende Elektromagnet den genannten Hohlraum aktorseitig im Bereich der Verbindungsebene zwischen Aktor und Zylinderkopf zumindest zum Teil begrenzt. Durch die Ausbildung des genannten Hohlraums und einer damit möglich werdenden Verlagerung von Aktorteilen in den Hohlraum und damit in Richtung der Zylinder kann die Bauhöhe in signifikantem Masse verringert werden, was insgesamt - insbesondere unter Berücksichtigung einer Vielzahl von zu montierenden Aktoren - zu einer kompakteren Brennkraftmaschine führt.Essential to the invention, a cavity is formed in the cylinder head, in which a part of the actuator is received. This part is the actuator part projecting beyond the electromagnet, the electromagnet lying between the anchors at least partially delimiting the said cavity on the actuator side in the region of the connection plane between the actuator and the cylinder head. Due to the formation of said cavity and thus becoming possible shift of Aktorteilen in the cavity and thus in the direction of the cylinder height can be reduced significantly, resulting in total - especially taking into account a variety of actuators to be mounted - to a more compact internal combustion engine ,

Überdies kann durch ein direktes Aufsetzen des Elektromagneten auf den Zylinderkopf eine günstige Wärmeabführung erreicht werden, so dass der Aktor einfach zu kühlen ist.Moreover, a favorable heat dissipation can be achieved by a direct placement of the electromagnet on the cylinder head, so that the actuator is easy to cool.

Gemäß einer vorteilhaften Ausführungsform ist der Ankerschaft im Elektromagneten selbst gelagert. Damit ist es lediglich wichtig, den Elektromagneten gegenüber dem Zylinderkopf zu fixieren.According to an advantageous embodiment, the armature shaft is mounted in the electromagnet itself. Thus, it is only important to fix the electromagnet relative to the cylinder head.

Der Ankerschaft des Aktors kann mit dem Ventilschaft des Ventils mittelbar oder unmittelbar, beispielsweise unter Zwischenschaltung eines Ventilspielausgleichselementes gekoppelt sein.The armature shaft of the actuator can be indirectly or directly coupled to the valve stem of the valve, for example with the interposition of a valve clearance compensation element.

Um den Hohlraum noch besser zu nutzen, ist es gemäß einer besonders vorteilhaften Ausführungsform der Erfindung vorgesehen, wenigstens eine erste Feder (Ventilfeder) in dem Hohlraum anzuordnen. Diese Ventilfeder kann das Ventil in eine Endstellung, beispielsweise die GeschlossenStellung vorspannen. Vorzugsweise stützt sich die Ventilfeder dabei einerseits am Ventilschaft und andererseits am Zylinderkopf ab. Dies ermöglicht eine einfache Einbauweise des Ventils.In order to use the cavity even better, it is provided according to a particularly advantageous embodiment of the invention to arrange at least a first spring (valve spring) in the cavity. This valve spring can bias the valve to an end position, such as the closed position. Preferably, the valve spring is supported on the one hand on the valve stem and on the other hand on the cylinder head. This allows a simple installation of the valve.

Eine zweite Feder (Aktorfeder) kann im Aktor integriert und bezüglich des Elektromagneten zylinderkopffern angeordnet sein. Der einfache Aufbau dieser Ausführungsform wird dadurch gefördert, wenn sich diese Aktorfeder unmittelbar gegen den zylinderkopffernen Anker abstützt. Durch eine Schraubvorrichtung, mittels der die Aktorfeder über einen Federsitz gehalten wird, kann zudem eine Justierung des Aktors, insbesondere der beiden Ankerplatten, in Bezug auf seine Lage zum Elektromagneten durchgeführt werden. Der Elektromagnet kann aus einem Spulenkern mit einem oder mehreren Polflächen bestehen, wie dies beispielsweise aus der DE 197 12 669 A1 bekannt ist.A second spring (actuator spring) can be integrated in the actuator and arranged cylinder head with respect to the electromagnet. The simple structure of this embodiment is promoted when this Aktorfeder is supported directly against the cylinder head distant anchor. By a screw device by means of the actuator spring is held by a spring seat, also an adjustment of the actuator, in particular the two anchor plates, in relation to its position to the electromagnet can be performed. The electromagnet may consist of a coil core with one or more pole faces, as is known for example from DE 197 12 669 A1.

Die vorliegende Erfindung wird nachfolgend anhand eines Ausführungsbeispiels und mit Bezug auf die beiliegenden Zeichnungen näher erläutert. Die Zeichnungen zeigen in

Figur 1
eine Schnittdarstellung einer Einheit, bestehend aus zwei elektromagnetischen Ventilen, die auf einem Zylinderkopf angeordnet sind, und
Figur 2
eine Schnittdarstellung eines erfindungsgemäß ausgebildeten Aktors.
The present invention will be explained in more detail below with reference to an embodiment and with reference to the accompanying drawings. The drawings show in
FIG. 1
a sectional view of a unit consisting of two electromagnetic valves, which are arranged on a cylinder head, and
FIG. 2
a sectional view of an inventively designed actuator.

In Figur 1 ist eine zusammengebaute Einheit, bestehend im wesentlichen aus zwei elektromagnetisch betätigten Gaswechselventilen, die auf einem Zylinderkopf angeordnet sind, im Schnitt dargestellt.In Figure 1, an assembled unit consisting essentially of two electromagnetically actuated gas exchange valves, which are arranged on a cylinder head, shown in section.

Der Aufbau eines elektromagnetischen Aktors für ein solches Gaswechselventil wird zunächst anhand von Figur 2 beschrieben.The construction of an electromagnetic actuator for such a gas exchange valve will first be described with reference to FIG.

Der Aktor 10 umfasst einen Elektromagneten 12, der vorliegend lediglich als Einheit dargestellt ist. Der Elektromagnet 12 kann eine oder mehrere Polflächen an den den jeweiligen Ankern zugewandten Seiten sowie eine oder mehrere Spulen umfassen. Im Elektromagneten 12 sind koaxial mit einer zentralen Bohrung an beiden Endbereichen zwei Lager 15 ausgebildet, die einen Ankerschaft 14 in axialer Richtung beweglich geführt halten. Am Ankerschaft 14 sind zwei Ankerplatten 16 und 18 axial voneinander beabstandet, und zwar auf jeweils gegenüberliegenden Seiten des Elektromagneten 12. Vorliegend ist die Ankerplatte 16 kleiner ausgebildet als die Ankerplatte 18. Bei einer Nullpunktlage der Anker mit jeweils gleichem Abstand vom Elektromagneten 12 ist diese Asymmetrie für ein Anschwingen des Aktors im Startfall der Brennkraftmaschine wichtig, da die Kraft auf die obere Ankerplatte 18 dann größer ist als diejenige auf die untere Ankerplatte 16. Der Abstand zwischen den beiden Ankerplatten 16 und 18 ist größer als die Dicke des Elektromagneten 12, so dass eine Hin- und Herbewegung in einem bestimmten Bereich gewährleistet ist.The actuator 10 comprises an electromagnet 12, which in the present case is shown only as a unit. The electromagnet 12 may comprise one or more pole faces on the sides facing the respective anchors and one or more coils. In the electromagnet 12, two bearings 15 are formed coaxially with a central bore at both end regions, which hold an armature shaft 14 movably guided in the axial direction. On the armature shaft 14, two armature plates 16 and 18 axially spaced from each other, on each opposite sides of the electromagnet 12. In the present case, the armature plate 16 is smaller than the armature plate 18. At a zero point of the armature, each with the same distance from the electromagnet 12, this asymmetry important for a swinging of the actuator in the starting case of the internal combustion engine, since the force on the upper anchor plate 18 is then greater than that on the lower anchor plate 16. The distance between the two anchor plates 16 and 18 is greater than the thickness of the electromagnet 12, so that a reciprocating motion in a certain area is guaranteed.

Der Elektromagnet 12 ist derart in einem Gehäuse 20 aufgenommen, dass er zusammen mit dem Gehäuse 20 den Aktor auf der Seite der kleinen Ankerplatte 16 im wesentlichen begrenzt. Damit steht die Ankerplatte 16 zusammen mit dem auf dieser Seite vorspringenden Ankerschaft 14 über das vom Elektromagneten 12 und dem Gehäuse 20 begrenzte Volumen über.The electromagnet 12 is accommodated in a housing 20 in such a way that, together with the housing 20, it essentially limits the actuator on the side of the small armature plate 16. Thus, the anchor plate 16 is together with the protruding on this side anchor shaft 14 via the volume limited by the electromagnet 12 and the housing 20.

Im in Figur 2 oben dargestellten oberen Bereich des Gehäuses 20 ist eine koaxial zur Bohrung im Elektromagneten 12 ausgerichtete Bohrung mit einem Innengewinde ausgebildet, in die eine Schraubvorrichtung 26 eindrehbar ist. Die Schraubvorrichtung 26 bildet zugleich einen Federsitz für eine Aktorfeder 22, die sich zum einen gegen diesen Federsitz und zum anderen gegen einen direkt auf der Ankerplatte 18 angeordneten Ventilsitz abstützt. Die Aktorfeder 22 dient zur Vorspannung des Gaswechselventils in Offenstellung und ist im vorliegend dargestellten Ausführungsbeispiel zusammengedrückt. Die Einschraubvorrichtung 26 umfasst überdies eine zentrale, gestufte Bohrung, in die ein Wegsensor 28 (vorliegend nicht näher dargestellt) eingesetzt ist. Der Wegsensor 28 umfasst wiederum eine zentrale, koaxial zu der Zylinderbohrung angeordnete Bohrung, durch die sich ein Fortsatz des Ankerschaftes 14 hindurcherstreckt.In the upper portion of the housing 20 shown in Figure 2 above a coaxial with the bore in the electromagnet 12 aligned bore is formed with an internal thread into which a screw 26 is screwed. The screwing device 26 also forms a spring seat for an actuator spring 22, which is supported on the one hand against this spring seat and on the other hand against a directly on the anchor plate 18 arranged valve seat. The actuator spring 22 serves for biasing the gas exchange valve in the open position and is compressed in the presently illustrated embodiment. The Einschraubvorrichtung 26 also includes a central, stepped bore into which a displacement sensor 28 (not shown in detail here) is inserted. The displacement sensor 28 in turn comprises a central bore arranged coaxially with the cylinder bore, through which extends an extension of the armature shaft 14.

Eine Bestromung des Elektromagneten 12 erfolgt über Zufuhrleitungen, von denen vorliegend nur eine mit Bezugsziffer 30 dargestellt ist.An energization of the electromagnet 12 via supply lines, of which in the present case only one is shown with reference numeral 30.

Mit der Bezugsziffer 23 ist eine sogenannte Ölgalerie bezeichnet. Dies ist eine Versorgungsleitung für Schmieröl, welche im Bereich der oberen Ankerplatte 18 endet und durch tröpfchenweise Zugabe von Schmieröl eine Minimalschmierung sicherstellt.The reference numeral 23 denotes a so-called oil gallery. This is a supply line for lubricating oil, which ends in the region of the upper anchor plate 18 and ensures minimal lubrication by dropwise addition of lubricating oil.

Gemäß Figur 1 ist ein Zylinderkopf 50 der Brennkraftmaschine im Bereich eines jeden Ventils mit einer Ausnehmung (Hohlraum) 58 ausgebildet, in welcher der über Gehäuse 20 und Elektromagnet 12 vorstehende Aktorteil (Ankerplatte 16 und Ankerschaft 14) aufgenommen ist. Überdies ist das Ventil 52 im Zylinderkopf gelagert und steht gegenüberliegend dem Aktor 12 in den Hohlraum 58 hinein.According to FIG. 1, a cylinder head 50 of the internal combustion engine is formed in the region of each valve with a recess (cavity) 58, in which the actuator part (armature plate 16 and armature shaft 14) protruding above the housing 20 and electromagnet 12 is accommodated. Moreover, the valve 52 is mounted in the cylinder head and is opposite to the actuator 12 in the cavity 58 inside.

Am oberen Ende des Ventils 52 ist ein Federsitz 56 angeordnet, gegen den sich eine weitere Federn, nämlich die Ventilfeder 54, abstützt. Die Ventilfeder 54 ist andererseits gegen einen Federsitz direkt am Zylinderkopf abgestützt und spannt das Ventil in seiner Geschlossen-Richtung vor. Am oberen Ende des Ventils ist ein nicht näher dargestelltes Ventilspielausgleichselement vorgesehen.At the upper end of the valve 52, a spring seat 56 is arranged, against which a further springs, namely the valve spring 54, is supported. On the other hand, the valve spring 54 is supported against a spring seat directly on the cylinder head and biases the valve in its closed direction. At the upper end of the valve not shown in detail valve clearance compensation element is provided.

Beim Zusammenbau wird nun die Ankerplatte 16 zusammen mit dem Ankerschaft 14 in den Hohlraum 58 derart eingeführt, dass das vordere Ende des Ankerschaftes auf dem Ventilschaft des darin bereits angeordneten Gaswechselventils unter Zwischenschaltung des Ventilspielausgleichselements zu liegen kommt. Damit besteht eine Kopplung zwischen dem Aktor 10 und dem Ventil 52. Durch eine geeignete Dimensionierung und Anordnung der Federn 22 und 54 beziehungsweise der entsprechende Federsitze wird eine Ankerstellung erreicht, in der der Elektromagnet in etwa zwischen den beiden Ankerplatten 16 und 18 zu liegen kommt (vorliegend nicht dargestellt). Dies stellt die Ruhelage dar. Durch die vorliegende, asymmetrische Wahl der beiden Ankerplatten 16 und 18 kann durch eine Bestromung des Elektromagneten beim Anschwingen eine anfängliche Auslenkung erreicht werden, so dass es schließlich bei nachfolgender, geeigneter, abwechselnder Bestromung und Stromlosstellung des Elektromagneten zu einem Hin- und Herschwingen des aus Anker, Ventil und Ventilfeder bestehenden Federmassesystems kommt. Dabei bewegt sich die untere Ankerplatte 16 im Hohlraum hin und her. Beide Anker 16, 18 können in ihren jeweiligen, elektromagnetnahen Endstellungen durch fortdauernde Bestromung gehalten werden.During assembly, the anchor plate 16 is now introduced together with the armature shaft 14 in the cavity 58 such that the front end of the armature shaft comes to rest on the valve stem of the gas exchange valve already arranged therein with the interposition of the valve lash adjuster. This results in a coupling between the actuator 10 and the valve 52. By a suitable dimensioning and arrangement of the springs 22 and 54 and the corresponding spring seats an anchor position is reached, in which the electromagnet is approximately between the two anchor plates 16 and 18 to lie ( not shown here). This represents the rest position. Due to the present, asymmetrical choice of the two anchor plates 16 and 18 can be achieved by energizing the electromagnet when swinging an initial deflection, so that it finally at subsequent, suitable, alternating energization and Stromlosstellung of the electromagnet to a Hin - And swinging of existing from anchor, valve and valve spring spring mass system comes. In this case, the lower armature plate 16 moves back and forth in the cavity. Both armatures 16, 18 can be held in their respective, near-end electromagnetic positions by continuous energization.

Der Hohlraum wird vorwiegend durch den Elektromagneten aktorseitig begrenzt. Durch die Aufnahme von Ventil- bzw. Aktorelementen im Hohlraum 58 kann eine besonders kleinbauenden Einheit aus Zylinderkopf und Aktoren erreicht werden, was Ziel der vorliegenden Erfindung ist.The cavity is mainly limited by the electromagnet actuator side. By the inclusion of valve or actuator elements in the cavity 58, a particularly small-sized unit of cylinder head and actuators can be achieved, which is the aim of the present invention.

Überdies liegt der Elektromagnet 12 zumindest an seinen Randbereichen direkt am Zylinderkopf an, der immer gut gekühlt ist. Durch diese optimale thermische Kopplung kann eine gute Wärmeabführung der im Aktor, insbesondere im Elektromagneten 12 selbst, erzeugten Wärme erreicht werden, ohne dass besondere Kühlungsmassnahmen für den Aktor ergriffen werden müssen.Moreover, the electromagnet 12 is located at least at its edge regions directly on the cylinder head, which is always well cooled. By means of this optimum thermal coupling, a good heat dissipation of the heat generated in the actuator, in particular in the electromagnet 12 itself, can be achieved without the need for special cooling measures for the actuator.

Claims (16)

  1. An internal combustion engine comprising an electromagnetic actuator (10) disposed on a cylinder head for operating a gas change valve (52), wherein the actuator (10) has a switchable electromagnet (12) disposed between two axially spaced armatures (16, 18) movable in the axial direction and disposed on a common armature shank (14), wherein a cavity (58) formed in the cylinder head receives the part (14, 16) of the actuator projecting beyond the electromagnet (12), characterised in that the electromagnet (12) at least partly bounds the cavity (58) on the actuator side in the connecting plane between the actuator (10) and the cylinder head (50).
  2. An engine according to claim 1, characterised in that the electromagnet (12) at least partly adjoins the cylinder head directly and is thermally coupled thereto.
  3. An engine according to claim 1 or 2, characterised in that the armature shank (14) is mounted in the electromagnet (12).
  4. An engine according to claim 3, characterised in that a continuous bearing or at least two bearings (15) are provided.
  5. An engine according to any of claims 1 to 4, characterised in that the armature shank (14) is directly or indirectly coupled to a valve stem of the valve (52) mounted in the cylinder head.
  6. An engine according to claim 5, characterised in that a valve clearance-compensating element is provided between the armature shank (14) and the valve stem.
  7. An engine according to any of claims 1 to 6, characterised in that a first spring (54) prestressing the valve towards an end position is provided in the cavity (58).
  8. An engine according to claim 7, characterised in that the first spring (54) biases the valve (52) towards its closed position.
  9. An engine according to claim 7 or 8, characterised in that the first spring (54) abuts the valve stem on one side and the cylinder head on the other side.
  10. An engine according to any of claims 1 to 9, characterised in that a second spring (22) is disposed remote from the cylinder head relative to the electromagnet.
  11. An engine according to claim 10, characterised in that the second spring (22) on the one hand abuts the armature (18) remote from the cylinder head.
  12. An engine according to claim 9 or 10, characterised in that the second spring (22) abuts against a spring seat (26) held by a screw device by means of which the actuator can be adjusted.
  13. An engine according to any of the preceding claims, characterised in that a sensor for detecting the armature positions is provided at one end of the actuator (10).
  14. An engine according to any of the preceding claims, characterised in that the electromagnet comprises at least one coil core with one or more pole faces.
  15. An engine according to any of the preceding claims, characterised in that the two armature plates are differently dimensioned.
  16. An engine according to any of the preceding claims, characterised in that an oil supply pipe ends in the top part of the actuator and supplies drops of oil for lubrication.
EP01996673A 2000-11-15 2001-10-23 Internal combustion engine comprising an electromagnetic actuator which is situated on a cylinder head Expired - Lifetime EP1334263B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10056572 2000-11-15
DE10056572A DE10056572A1 (en) 2000-11-15 2000-11-15 Internal combustion engine has cylinder head hollow volume in least partly accommodating armature on cylinder head side and at least partly bounded by electromagnet on actuator side
PCT/EP2001/012229 WO2002040834A1 (en) 2000-11-15 2001-10-23 Internal combustion engine comprising an electromagnetic actuator which is situated on a cylinder head

Publications (2)

Publication Number Publication Date
EP1334263A1 EP1334263A1 (en) 2003-08-13
EP1334263B1 true EP1334263B1 (en) 2006-06-14

Family

ID=7663368

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01996673A Expired - Lifetime EP1334263B1 (en) 2000-11-15 2001-10-23 Internal combustion engine comprising an electromagnetic actuator which is situated on a cylinder head

Country Status (5)

Country Link
US (1) US6889638B2 (en)
EP (1) EP1334263B1 (en)
JP (1) JP4029036B2 (en)
DE (2) DE10056572A1 (en)
WO (1) WO2002040834A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1805255A1 (en) * 2004-10-25 2007-07-11 Ciba Specialty Chemicals Holding Inc. Functionalized nanoparticles
US7344917B2 (en) * 2005-11-30 2008-03-18 Freescale Semiconductor, Inc. Method for packaging a semiconductor device
EP2816066A1 (en) * 2013-06-19 2014-12-24 Basf Se Low emission, stabilised polyurethane

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1391955A (en) * 1972-07-12 1975-04-23 British Leyland Austin Morris Actuating internal combustion engine poppet valves
DE3826978A1 (en) * 1988-08-09 1990-02-15 Meyer Hans Wilhelm ELECTROMAGNETICALLY OPERABLE ACTUATOR
ATE193589T1 (en) * 1994-11-09 2000-06-15 Aura Systems Inc ELECTROMAGNETIC STEERED VALVE WITH STEERED FITTING
DE19623698A1 (en) * 1996-06-14 1997-12-18 Fev Motorentech Gmbh & Co Kg Control of piston IC engine valve actuator
DE19706106A1 (en) 1997-02-17 1998-08-27 Siemens Ag Valve device of an internal combustion engine
DE19712669C2 (en) 1997-03-26 2000-03-30 Daimler Chrysler Ag Electromagnetically controlled valve
US6116570A (en) * 1998-03-30 2000-09-12 Siemens Automotive Corporation Electromagnetic actuator with internal oil system and improved hydraulic lash adjuster

Also Published As

Publication number Publication date
US6889638B2 (en) 2005-05-10
US20040020451A1 (en) 2004-02-05
JP4029036B2 (en) 2008-01-09
DE10056572A1 (en) 2002-05-23
WO2002040834A1 (en) 2002-05-23
DE50110175D1 (en) 2006-07-27
EP1334263A1 (en) 2003-08-13
JP2004514085A (en) 2004-05-13

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