EP1377732B1 - Connection between a stem end of a gas exchange valve in an internal combustion engine and a sleeve-shaped control piston on a tappet - Google Patents

Connection between a stem end of a gas exchange valve in an internal combustion engine and a sleeve-shaped control piston on a tappet Download PDF

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Publication number
EP1377732B1
EP1377732B1 EP02729823A EP02729823A EP1377732B1 EP 1377732 B1 EP1377732 B1 EP 1377732B1 EP 02729823 A EP02729823 A EP 02729823A EP 02729823 A EP02729823 A EP 02729823A EP 1377732 B1 EP1377732 B1 EP 1377732B1
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EP
European Patent Office
Prior art keywords
piston
sleeve
wedge
connection according
actuating piston
Prior art date
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.)
Expired - Lifetime
Application number
EP02729823A
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German (de)
French (fr)
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EP1377732A1 (en
Inventor
Uwe Hammer
Sevan Tatiyosyan
Volker Beuche
Peter Lang
Stefan Reimer
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication date
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Publication of EP1377732A1 publication Critical patent/EP1377732A1/en
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Classifications

    • 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
    • F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F01L3/10—Connecting springs to valve members
    • 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
    • F01L9/10—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T403/00—Joints and connections
    • Y10T403/70—Interfitted members
    • Y10T403/7062—Clamped members
    • Y10T403/7064—Clamped members by wedge or cam
    • Y10T403/7066—Clamped members by wedge or cam having actuator
    • Y10T403/7067—Threaded actuator
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T403/00—Joints and connections
    • Y10T403/70—Interfitted members
    • Y10T403/7062—Clamped members
    • Y10T403/7064—Clamped members by wedge or cam
    • Y10T403/7066—Clamped members by wedge or cam having actuator
    • Y10T403/7067—Threaded actuator
    • Y10T403/7069—Axially oriented

Definitions

  • the invention is based on a connection between a shaft end of a gas exchange valve of an internal combustion engine and a sleeve-shaped actuating piston of a valve actuator, according to the preamble of claim 1.
  • connection is from the DE 198 26 046 A1 known, with at least two the shaft end enclosing, on the adjusting piston axially supporting, shell-shaped wedge pieces whose radially outer peripheral surface is conical and which are surrounded by a Konusspannhülse whose radially inner peripheral surface extends complementary to the cone angle of the wedge pieces and which against this is axially braced by a screwed onto the shaft end nut.
  • an annular projection is provided which engages in an annular groove on the radially outer peripheral surface of the shaft end.
  • the actuating piston is formed by a differential piston, which can slide up and down within a cylinder housing of the valve actuator depending on the pressurization of its front-facing piston surfaces facing away from each other. Due to the relatively high number of components to be assembled results in this connection, however, a high production cost, also builds the connection is relatively large.
  • the Konusspannhülse is formed according to the invention by the actuating piston, this performs a dual function by attacking him on the one hand, the hydraulic actuating forces and on the other hand, provides for the axial clamping of the cone connection, whereby a separate Konusspannhülse can be omitted.
  • the threaded portions serving for the tensioning of the conical connection are designed according to the invention on the adjusting piston and on the wedge pieces, so that it is also possible to dispense with a clamping nut.
  • the consequently reduced number of connecting components simplifies and shortens the assembly, and in addition reduces the space required for the connection, and finally also the weight of the connection is reduced.
  • the connection through an opening in the valve actuator housing from the combustion chamber remote outside is easily accessible. Because the valve stem for mounting the compound therefore does not have to protrude from the opening, in particular gas exchange valves with short stems and a consequently low inertia can be used.
  • connection radially enclosed by the actuating piston and a pressurized hydraulic fluid is arranged on a radially outer region of the actuating piston. Then the connection is not in the pressure range, so that the hydraulic circuit of the pressure range does not have to be opened when a loosening of the connection, for example, for repair purposes is necessary.
  • the wedge pieces seen in the circumferential direction join each other without a gap and complement each other to form a circumferential wedge sleeve whose inner diameter is slightly larger than the outer diameter of the shaft end of the gas exchange valve and that the projections and recesses interlock with little play.
  • a play-related, positive connection is created by which concentricity errors between the valve seat and the guidance of the valve stem in the valve actuator can be compensated.
  • rotational movements of the shaft end are allowed relative to the actuating piston.
  • the adjusting piston does not have to rotate with the gas exchange valve to allow the known by regular rotation of the gas exchange valve around its longitudinal axis advantages such as a homogenization of the valve wear or a free attitude of the valve seat of deposits, so that the sealing function of the actuating piston is not affected.
  • the actuating piston is formed in two parts and includes a combustion chamber near closing piston and this axially adjoining and working in opposite directions, combustion chamber remote opening piston, wherein the conical portion and the threaded portion are arranged on the opening piston.
  • the adjusting piston can also be designed as a one-piece differential piston.
  • the number of components is further reduced and the length of the gas exchange valve stem can be even smaller because of the then shorter executable actuating piston.
  • a valve train of an internal combustion engine is in Fig.1 for reasons of scale, only one gas exchange valve 1 is shown, which is actuated by an actuating piston 2 of a valve actuator 4 such that it performs up and down opening and closing movements.
  • the actuating piston 2 extends substantially from a bottom opening 6 of a valve housing 8 of the valve actuator 4 close to the combustion chamber to a bore 14 formed in a cover 12 placed on an upper opening 10 of the actuator housing 8 and, according to a preferred embodiment, comprises two counter-rotating pistons, a combustion chamber near sleeve-shaped closing piston 16 and a this axially adjoining combustion chamber remote and also sleeve-shaped opening piston 18.
  • the closing piston 16 and the opening piston 18 surround a shaft 20 of the gas exchange valve 1 with radial distance coaxially.
  • the shaft 20 of the gas exchange valve 1 extends from a cylinder head of the internal combustion engine, not shown, through the bottom opening 6 into the interior of the actuator housing 8, wherein a shaft end 22 is axially spaced from the bore 14 in the cover 12.
  • the closing piston 16 defines a lower working space 28 and a sleeve pushed onto the opening piston 18 with a ring area 24 of a first radially outer shoulder 26 close to the combustion chamber 29 with an upper annular surface 30 of a second radially outer shoulder 32 an upper working space 34, wherein the working spaces 28, 34 through in Fig.1 not shown channels can be filled or relieved with a pressure medium.
  • Both pistons 16, 18 are also axially guided by means of a pressed-in the actuator housing 8 bushing 36.
  • a seal 38 in the region of the bore 14 of the cover 12 and a seal 40 in the region of the bottom opening 6 of the actuator housing 8 ensure an axial sealing of the two working chambers 28, 34.
  • a connection 42 between the shaft end 22 of the gas exchange valve 1 and the opening piston 18 includes two shaft end 22 enclosing, shell-shaped wedge pieces 44, 46, which complement each other to a circumferential wedge sleeve 48, from which the radially outer peripheral surface of a combustion chamber near section 50 in one of Combustion chamber pointing away direction conically tapered.
  • This conical portion 50 of the wedge sleeve 48 is followed by a cylindrical portion 52 with an external thread 54, which in turn terminates in a section 56 with a preferably formed as a square 58 lug surface for a screwing.
  • a radially inner peripheral surface of a combustion chamber near portion 60 of the opening piston 18 extends complementary to the cone angle of the wedge sleeve 48, in addition, this section 60 axially adjoining threaded portion 62 is provided with a screwed to the external thread 54 of the wedge sleeve 48 internal thread 64.
  • the threaded portion 62 of the opening piston 18 is followed by a cylindrical, radially spaced from the square 58 of the wedge sleeve 48 section 66, which has on its radially inner peripheral surface preferably designed as a hexagon 68 approach surface for a screwing.
  • the radial distance of the Square 58 of the hexagon socket 68 is sufficiently large so that the square 58 can attack a screwing tool.
  • connection 42 On the radially inner circumferential surface of the wedge sleeve 48 and on the radially outer circumferential surface of the shaft end 22 of the gas exchange valve 1 interlocking projections 70 and recesses 72 are provided to produce a positive connection 42.
  • the connection 42 is radially enclosed by the opening piston 18 and shielded from it by a radially outer hydraulic area containing the lower and upper working spaces 28, 34.
  • the wedge sleeve 48 on the radially inner peripheral surface of the conical section three equidistantly axially behind each other, each extending in the circumferential direction Ringwülste 70, each of which engages an associated, formed in the shaft end 22, circumferential annular groove 72.
  • the annular beads 70 and annular grooves 72 have a substantially semicircular cross section, wherein the inner radius of the annular grooves 72 is preferably larger by a few hundredths of a millimeter than the outer radius of the annular beads 70.
  • the actuator housing 8 with preassembled bushing 36, preassembled closing piston 16 and preassembled seal 40 is first placed on the cylinder head of the internal combustion engine, wherein the shaft 20 of the gas exchange valve 1 is passed through the closing piston 16 from below , Subsequently, the two wedge pieces 44, 46 are placed through the upper opening 10 of the actuator housing 8 on the shaft end 22 and the opening piston 18 screwed from above onto the thus formed wedge sleeve 48 by a Square key to prevent rotation on the square 58 of the wedge sleeve 48 is placed and at the same time a hex wrench is inserted into the hexagon socket 68 of the opening piston 18, as shown by Fig.2 is easy to imagine.
  • the hex key In order to enable a simultaneous application of tools, the hex key must have a central through hole for the shaft of the square socket wrench.
  • the wedge pieces 44, 46 are braced radially relative to one another and, because of the form-fitting interlocking projections 70 and recesses 72, the shank end 22 is drawn into the conical section 60 of the opening piston 18.
  • a combustion chamber near, the shaft end 22 radially superior annular surface 74 on the front side of the wedge sleeve 48 then forms an axial stop surface for the closing piston 16, between this and the opening piston 18, a narrow axial gap 76 remains, so that the two pistons 16, 18 not with each other are connected.
  • the wedge pieces 44, 46 in the circumferential direction join each other without a gap and flush and complement each other to the circumferential wedge sleeve 48 whose inner diameter is slightly larger than the outer diameter of the shaft end 22 of the gas exchange valve 1 and because the projections 70 and recesses 72 also with play into each other can grasp no frictional contact between the peripheral surface of the shaft end 22 of the gas exchange valve 1 and the radially inner peripheral surface of the wedge sleeve 48 form, which would be sufficient to prevent rotational movements of the shaft end 22 relative to the screwed with the opening piston 18 wedge sleeve 48 can.
  • the gas exchange valve 1 remains freely rotatable relative to the valve actuator 4.
  • the diameter difference between the inner diameter of the wedge sleeve 48 and the outer diameter of the shaft end 22 of the gas exchange valve 1 is preferably a few hundredths of a millimeter.
  • valve actuator 4 is as follows: Starting from the in Fig.1 shown opening position is applied to close the gas exchange valve 1, the lower working chamber 28 with pressure and at the same time the upper working chamber 34 relieved of pressure, so that the closing piston 16 moves upward and via the annular surface 74 of the wedge sleeve 48 and the connection 42 the opening piston 18 entrains, so that this can drive out of the bore 14 in the lid 12. Conversely, to open the gas exchange valve 1, the upper working chamber 34 is pressurized and at the same time depressurizes the lower working chamber 28, whereby the downwardly compressed opening piston 18 entrains the closing piston 16 via the connection 42 and the annular surface 74 of the wedge sleeve 48.
  • the power flow from the opening piston 18 to the shaft end 22 runs mainly on the interlocking projections 70 and recesses 72 in a form-fitting manner, while the axially offset, threaded threaded portions 52, 62 serve only the radial cohesion of the wedge pieces 44, 46, so that they are essentially exposed to no dynamic loads.
  • the parts that are the same and function the same as in the previous example are identified by the same reference numerals.
  • the actuating piston 2 is formed as a one-piece differential piston 78, which is in the open position of the gas exchange valve. 1 extends from the combustion chamber near bottom opening 6 of the actuator housing 8 to the bore 14 in the cover 12.

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

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einer Verbindung zwischen einem Schaftende eines Gaswechselventils einer Brennkraftmaschine und einem hülsenförmigen Stellkolben eines Ventilstellers, gemäß dem Oberbegriff des Anspruchs 1.The invention is based on a connection between a shaft end of a gas exchange valve of an internal combustion engine and a sleeve-shaped actuating piston of a valve actuator, according to the preamble of claim 1.

Eine solche Verbindung ist aus der DE 198 26 046 A1 bekannt, mit wenigstens zwei das Schaftende umschließenden, sich am Stellkolben axial abstützenden, schalenförmigen Keilstücken, deren radial äußere Umfangsfläche konisch verläuft und welche von einer Konusspannhülse umfaßt sind, deren radial innere Umfangsfläche komplementär zum Konuswinkel der Keilstücke verläuft und welche gegen diese durch eine auf das Schaftende aufgeschraubte Mutter axial verspannt ist. An der radial inneren Umfangsfläche der Keilstücke ist ein Ringvorsprung vorhanden, der in eine Ringnut an der radial äußeren Umfangsfläche des Schaftendes eingreift. Der Stellkolben wird durch einen Differentialkolben gebildet, der je nach Druckbeaufschlagung seiner voneinander weg weisenden stirnseitigen Kolbenflächen innerhalb eines Zylindergehäuses des Ventilstellers auf und ab gleiten kann. Bedingt durch die relativ hohe Anzahl der zu montierenden Bauteile ergibt sich bei dieser Verbindung jedoch ein hoher Fertigungsaufwand, außerdem baut die Verbindung relativ groß.Such a connection is from the DE 198 26 046 A1 known, with at least two the shaft end enclosing, on the adjusting piston axially supporting, shell-shaped wedge pieces whose radially outer peripheral surface is conical and which are surrounded by a Konusspannhülse whose radially inner peripheral surface extends complementary to the cone angle of the wedge pieces and which against this is axially braced by a screwed onto the shaft end nut. On the radially inner circumferential surface of the wedge pieces, an annular projection is provided which engages in an annular groove on the radially outer peripheral surface of the shaft end. The actuating piston is formed by a differential piston, which can slide up and down within a cylinder housing of the valve actuator depending on the pressurization of its front-facing piston surfaces facing away from each other. Due to the relatively high number of components to be assembled results in this connection, however, a high production cost, also builds the connection is relatively large.

Vorteile der ErfindungAdvantages of the invention

Weil die Konusspannhülse erfindungsgemäß durch den Stellkolben gebildet wird, übt dieser eine Doppelfunktion aus, indem an ihm einerseits die hydraulischen Stellkräfte angreifen und er andererseits für die axiale Verspannung der Konusverbindung sorgt, wodurch eine separate Konusspannhülse entfallen kann. Darüber hinaus sind die für die Verspannung der Konusverbindung dienenden Gewindeabschnitte erfindungsgemäß am Stellkolben und an den Keilstücken ausgebildet, so daß auch auf eine Spannmutter verzichtet werden kann. Die infolgedessen reduzierte Anzahl von Verbindungsbauteilen vereinfacht und verkürzt die Montage, außerdem verkleinert sich hierdurch der für die Verbindung notwendige Bauraum, schließlich wird auch das Gewicht der Verbindung reduziert.Because the Konusspannhülse is formed according to the invention by the actuating piston, this performs a dual function by attacking him on the one hand, the hydraulic actuating forces and on the other hand, provides for the axial clamping of the cone connection, whereby a separate Konusspannhülse can be omitted. In addition, the threaded portions serving for the tensioning of the conical connection are designed according to the invention on the adjusting piston and on the wedge pieces, so that it is also possible to dispense with a clamping nut. The consequently reduced number of connecting components simplifies and shortens the assembly, and in addition reduces the space required for the connection, and finally also the weight of the connection is reduced.

Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen der im Patentanspruch 1 angegebenen Erfindung möglich.The measures listed in the dependent claims advantageous refinements and improvements of the patent claim 1 invention are possible.

Gemäß einer besonders zu bevorzugenden Maßnahme ist am Stellkolben und an einer aus den Keilstücken zusammengesetzten, umlaufenden Keilhülse je eine derart ausgebildete Ansatzfläche für ein Schraubwerkzeug vorhanden, daß ein gleichzeitiger Angriff von den Ansatzflächen zugeordneten Schraubwerkzeugen möglich ist. Dann können die Keilstücke und der Stellkolben in einem einzigen Arbeitsgang miteinander verschraubt werden. Darüber hinaus ist die Verbindung durch eine Öffnung im Ventilstellergehäuse von der brennraumfernen Außenseite her gut zugängig. Weil der Ventilschaft zur Montage der Verbindung demzufolge nicht aus der Öffnung herausragen muss, können insbesondere Gaswechselventile mit kurzen Schäften und einer demzufolge geringen Massenträgheit verwendet werden.According to a particularly preferable measure, each such a trained approach surface for a screwing available on the actuator piston and on a composite of the wedge pieces, circumferential wedge sleeve that a simultaneous attack of the approach surfaces associated screwing tools is possible. Then the wedge pieces and the adjusting piston can be screwed together in a single operation. In addition, the connection through an opening in the valve actuator housing from the combustion chamber remote outside is easily accessible. Because the valve stem for mounting the compound therefore does not have to protrude from the opening, in particular gas exchange valves with short stems and a consequently low inertia can be used.

Eine Weiterbildung sieht vor, daß die Verbindung vom Stellkolben radial umschlossen und ein mit Druckmittel beaufschlagter hydraulischer Bereich an einem radial äußeren Bereich des Stellkolbens angeordnet ist. Dann befindet sich die Verbindung nicht im Druckbereich, so daß der Hydraulikkreis des Druckbereichs nicht geöffnet werden muß, wenn ein Lösen der Verbindung beispielsweise zu Reparaturzwecken notwendig ist.A further development provides that the connection radially enclosed by the actuating piston and a pressurized hydraulic fluid is arranged on a radially outer region of the actuating piston. Then the connection is not in the pressure range, so that the hydraulic circuit of the pressure range does not have to be opened when a loosening of the connection, for example, for repair purposes is necessary.

In bevorzugter Weise ist außerdem vorgesehen, daß die Keilstücke in Umfangsrichtung gesehen aneinander spaltlos anschließen und sich zu einer umlaufenden Keilhülse ergänzen, deren Innendurchmesser geringfügig größer ist als der Außendurchmesser des Schaftendes des Gaswechselventils und daß die Vorsprünge und Ausnehmungen mit geringem Spiel ineinander greifen. Hierdurch wird eine spielbehaftete, formschlüssige Verbindung geschaffen, durch welche Konzentrizitätsfehler zwischen Ventilssitz und der Führung des Ventilschaftes im Ventilsteller ausgeglichen werden können. Darüber hinaus werden Drehbewegungen des Schaftendes relativ zum Stellkolben zugelassen. Dann muß sich der Stellkolben nicht mit dem Gaswechselventil mitdrehen, um die durch regelmäßige Drehung des Gaswechselventils um seine Längsachse bekannten Vorteile wie eine Vergleichmäßigung des Ventilverschleißes oder eine Freihaltung des Ventilsitzes von Ablagerungen zu ermöglichen, so daß die Dichtfunktion des Stellkolbens nicht beeinträchtigt wird.Preferably, it is also provided that the wedge pieces seen in the circumferential direction join each other without a gap and complement each other to form a circumferential wedge sleeve whose inner diameter is slightly larger than the outer diameter of the shaft end of the gas exchange valve and that the projections and recesses interlock with little play. As a result, a play-related, positive connection is created by which concentricity errors between the valve seat and the guidance of the valve stem in the valve actuator can be compensated. Furthermore rotational movements of the shaft end are allowed relative to the actuating piston. Then the adjusting piston does not have to rotate with the gas exchange valve to allow the known by regular rotation of the gas exchange valve around its longitudinal axis advantages such as a homogenization of the valve wear or a free attitude of the valve seat of deposits, so that the sealing function of the actuating piston is not affected.

Vorzugsweise ist der Stellkolben zweiteilig ausgebildet und beinhaltet einen brennraumnahen Schließkolben und einen sich diesem axial anschließenden und gegenläufig arbeitenden, brennraumfernen Öffnungskolben, wobei der konische Abschnitt und der Gewindeabschnitt am Öffnungskolben angeordnet sind.Preferably, the actuating piston is formed in two parts and includes a combustion chamber near closing piston and this axially adjoining and working in opposite directions, combustion chamber remote opening piston, wherein the conical portion and the threaded portion are arranged on the opening piston.

Gemäß einer weiteren Ausführungsform kann der Stellkolben auch als einstückiger Differentialkolben ausgeführt sein. In diesem Fall wird die Anzahl der Bauteile weiter reduziert und die Länge des Gaswechselventilschaftes kann wegen des dann kürzer ausführbaren Stellkolbens noch kleiner ausfallen.According to a further embodiment, the adjusting piston can also be designed as a one-piece differential piston. In this case, the number of components is further reduced and the length of the gas exchange valve stem can be even smaller because of the then shorter executable actuating piston.

Zeichnungendrawings

Ausführungsbeispiele der Erfindung sind in den Zeichnungen dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen :

Fig. 1
eine seitliche Querschnittsdarstellung einer bevorzugten Ausführungsform einer erfindungsgemäßen Verbindung zwischen einem Schaftende eines Gaswechselventils einer Brennkraftmaschine und einem Stellkolben eines Ventilstellers;
Fig.2
eine Querschnittsdarstellung entlang der Linie II - II von Fig.1;
Fig.3
eine seitliche Querschnittsdarstellung einer weiteren Ausführungsform der erfindungsgemäßen Verbindung.
Embodiments of the invention are illustrated in the drawings and explained in more detail in the following description. Show it :
Fig. 1
a side cross-sectional view of a preferred embodiment of a compound according to the invention between a shaft end of a gas exchange valve of an internal combustion engine and an actuating piston of a valve actuator;
Fig.2
a cross-sectional view along the line II - II of Fig.1 ;
Figure 3
a lateral cross-sectional view of another embodiment of the compound according to the invention.

Beschreibung der AusführungsbeispieleDescription of the embodiments

Von einem Ventiltrieb einer Brennkraftmaschine ist in Fig.1 aus Maßstabsgründen nur ein Gaswechselventil 1 gezeigt, welches durch einen Stellkolben 2 eines Ventilstellers 4 derart betätigt wird, daß es auf- und abwärtsgehende Öffnungs- und Schließbewegungen ausführt.From a valve train of an internal combustion engine is in Fig.1 for reasons of scale, only one gas exchange valve 1 is shown, which is actuated by an actuating piston 2 of a valve actuator 4 such that it performs up and down opening and closing movements.

Der Stellkolben 2 erstreckt sich im wesentlichen von einer brennraumnahen Bodenöffnung 6 eines Stellergehäuses 8 des Ventilstellers 4 bis zu einer in einem auf eine obere Öffnung 10 des Stellergehäuses 8 aufgesetzten Deckel 12 ausgebildeten Bohrung 14 und beinhaltet gemäß einer bevorzugten Ausführungsform zwei gegenläufig arbeitende Kolben, einen brennraumnahen hülsenförmigen Schließkolben 16 und einen sich diesem axial anschließenden brennraumfernen und ebenfalls hülsenförmigen Öffnungskolben 18. Der Schließkolben 16 und der Öffnungskolben 18 umschließen einen Schaft 20 des Gaswechselventils 1 mit Radialabstand koaxial. Der Schaft 20 des Gaswechselventils 1 erstreckt sich von einem nicht dargestellten Zylinderkopf der Brennkraftmaschine durch die Bodenöffnung 6 hindurch bis in das Innere des Stellergehäuses 8 hinein, wobei ein Schaftende 22 von der Bohrung 14 im Deckel 12 axial beabstandet ist.The actuating piston 2 extends substantially from a bottom opening 6 of a valve housing 8 of the valve actuator 4 close to the combustion chamber to a bore 14 formed in a cover 12 placed on an upper opening 10 of the actuator housing 8 and, according to a preferred embodiment, comprises two counter-rotating pistons, a combustion chamber near sleeve-shaped closing piston 16 and a this axially adjoining combustion chamber remote and also sleeve-shaped opening piston 18. The closing piston 16 and the opening piston 18 surround a shaft 20 of the gas exchange valve 1 with radial distance coaxially. The shaft 20 of the gas exchange valve 1 extends from a cylinder head of the internal combustion engine, not shown, through the bottom opening 6 into the interior of the actuator housing 8, wherein a shaft end 22 is axially spaced from the bore 14 in the cover 12.

Der Schließkolben 16 begrenzt mit einer brennraumnahen Ringfläche 24 eines ersten radial äußeren Absatzes 26 einen unteren Arbeitsraum 28 und eine auf den Öffnungskolben 18 geschobene Hülse 29 mit einer oberen Ringfläche 30 eines zweiten radial äußeren Absatzes 32 einen oberen Arbeitsraum 34, wobei die Arbeitsräume 28, 34 durch in Fig.1 nicht dargestellte Kanäle mit einem Druckmittel befüllbar oder entlastbar sind. Beide Kolben 16, 18 sind außerdem mittels einer in das Stellergehäuse 8 eingepreßten Laufbuchse 36 axial geführt. Eine Dichtung 38 im Bereich der Bohrung 14 des Deckels 12 und eine Dichtung 40 im Bereich der Bodenöffnung 6 des Stellergehäuses 8 sorgen für eine axiale Abdichtung der beiden Arbeitsräume 28, 34.The closing piston 16 defines a lower working space 28 and a sleeve pushed onto the opening piston 18 with a ring area 24 of a first radially outer shoulder 26 close to the combustion chamber 29 with an upper annular surface 30 of a second radially outer shoulder 32 an upper working space 34, wherein the working spaces 28, 34 through in Fig.1 not shown channels can be filled or relieved with a pressure medium. Both pistons 16, 18 are also axially guided by means of a pressed-in the actuator housing 8 bushing 36. A seal 38 in the region of the bore 14 of the cover 12 and a seal 40 in the region of the bottom opening 6 of the actuator housing 8 ensure an axial sealing of the two working chambers 28, 34.

Eine Verbindung 42 zwischen dem Schaftende 22 des Gaswechselventils 1 und dem Öffnungskolben 18 beinhaltet zwei das Schaftende 22 umschließende, schalenförmige Keilstücke 44, 46, die sich zu einer umlaufenden Keilhülse 48 ergänzen, von welcher die radial äußere Umfangsfläche eines brennraumnahen Abschnitts 50 sich in einer vom Brennraum weg weisenden Richtung konisch verjüngt. Diesem konischen Abschnitt 50 der Keilhülse 48 schließt sich ein zylindrischer Abschnitt 52 mit einem Außengewinde 54 an, welcher wiederum endseitig in einem Abschnitt 56 mit einer vorzugsweise als Vierkant 58 ausgebildeten Ansatzfläche für ein Schraubwerkzeug mündet.A connection 42 between the shaft end 22 of the gas exchange valve 1 and the opening piston 18 includes two shaft end 22 enclosing, shell-shaped wedge pieces 44, 46, which complement each other to a circumferential wedge sleeve 48, from which the radially outer peripheral surface of a combustion chamber near section 50 in one of Combustion chamber pointing away direction conically tapered. This conical portion 50 of the wedge sleeve 48 is followed by a cylindrical portion 52 with an external thread 54, which in turn terminates in a section 56 with a preferably formed as a square 58 lug surface for a screwing.

Eine radial innere Umfangsfläche eines brennraumnahen Abschnitts 60 des Öffnungskolbens 18 verläuft komplementär zum Konuswinkel der Keilhülse 48, darüber hinaus ist ein sich diesem Abschnitt 60 axial anschließender Gewindeabschnitt 62 mit einem mit dem Außengewinde 54 der Keilhülse 48 verschraubbaren Innengewinde 64 versehen. Dem Gewindeabschnitt 62 des Öffnungskolbens 18 schließt sich ein zylindrischer, vom Vierkant 58 der Keilhülse 48 radial beabstandeter Abschnitt 66 an, der an seiner radial inneren Umfangsfläche eine vorzugsweise als Innensechskant 68 ausgeführte Ansatzfläche für ein Schraubwerkzeug aufweist. Der radiale Abstand des Vierkants 58 vom Innensechskant 68 ist ausreichend groß, damit am Vierkant 58 ein Schraubwerkzeug angreifen kann.A radially inner peripheral surface of a combustion chamber near portion 60 of the opening piston 18 extends complementary to the cone angle of the wedge sleeve 48, in addition, this section 60 axially adjoining threaded portion 62 is provided with a screwed to the external thread 54 of the wedge sleeve 48 internal thread 64. The threaded portion 62 of the opening piston 18 is followed by a cylindrical, radially spaced from the square 58 of the wedge sleeve 48 section 66, which has on its radially inner peripheral surface preferably designed as a hexagon 68 approach surface for a screwing. The radial distance of the Square 58 of the hexagon socket 68 is sufficiently large so that the square 58 can attack a screwing tool.

An der radial inneren Umfangsfläche der Keilhülse 48 und an der radial äußeren Umfangsfläche des Schaftendes 22 des Gaswechselventils 1 sind ineinander greifende Vorsprünge 70 und Ausnehmungen 72 vorgesehen, um eine formschlüssige Verbindung 42 zu erzeugen. Die Verbindung 42 wird vom Öffnungskolben 18 radial umschlossen und von diesem gegenüber einem den unteren und oberen Arbeitsraum 28, 34 enthaltenden, radial äußeren hydraulischen Bereich abgeschirmt.On the radially inner circumferential surface of the wedge sleeve 48 and on the radially outer circumferential surface of the shaft end 22 of the gas exchange valve 1 interlocking projections 70 and recesses 72 are provided to produce a positive connection 42. The connection 42 is radially enclosed by the opening piston 18 and shielded from it by a radially outer hydraulic area containing the lower and upper working spaces 28, 34.

Gemäß der bevorzugten Ausführungsform weist die Keilhülse 48 an der radial inneren Umfangsfläche des konischen Abschnitts drei äquidistant axial hintereinander angeordnete, sich jeweils in Umfangsrichtung ersteckende Ringwülste 70 auf, von welchen je eine in eine zugeordnete, im Schaftende 22 ausgebildete, umlaufende Ringnut 72 eingreift. Die Ringwülste 70 und Ringnuten 72 haben einen im wesentlichen halbkreisförmigen Querschnitt, wobei der Innenradius der Ringnuten 72 um vorzugsweise wenige Hundertstel Millimeter größer als der Außenradius der Ringwülste 70 ist.According to the preferred embodiment, the wedge sleeve 48 on the radially inner peripheral surface of the conical section three equidistantly axially behind each other, each extending in the circumferential direction Ringwülste 70, each of which engages an associated, formed in the shaft end 22, circumferential annular groove 72. The annular beads 70 and annular grooves 72 have a substantially semicircular cross section, wherein the inner radius of the annular grooves 72 is preferably larger by a few hundredths of a millimeter than the outer radius of the annular beads 70.

Bei der Montage der Verbindung 42 wird zunächst das noch ohne Deckel 12 vorhandene Stellergehäuse 8 mit vormontierter Laufbuchse 36, vormontiertem Schließkolben 16 und vormontierter Dichtung 40 auf den Zylinderkopf der Brennkraftmaschine gesetzt, wobei der Schaft 20 des Gaswechselventils 1 durch den Schließkolben 16 von unten hindurchgeführt wird. Anschließend werden die beiden Keilstücke 44, 46 durch die obere Öffnung 10 des Stellergehäuses 8 hindurch auf das Schaftende 22 aufgesetzt und der Öffnungskolben 18 von oben auf die so gebildete Keilhülse 48 aufgeschraubt, indem ein Vierkant-Schlüssel als Verdrehsicherung auf den Vierkant 58 der Keilhülse 48 aufgesetzt und gleichzeitig ein Sechskant-Schlüssel in den Innensechskant 68 des Öffnungskolbens 18 eingesteckt wird, wie anhand von Fig.2 leicht vorstellbar ist. Um ein gleichzeitiges Ansetzen der Werkzeuge zu ermöglichen, muß der Sechskantschlüssel eine mittige Durchgangsöffnung für den Schaft des Vierkant-Steckschlüssels aufweisen. Durch die Schraubbewegung werden die Keilstücke 44, 46 aufgrund der Keilwirkung radial gegeneinander verspannt und wegen der formschlüssig ineinander greifenden Vorsprünge 70 und Ausnehmungen 72 das Schaftende 22 in den konischen Abschnitt 60 des Öffnungskolbens 18 eingezogen. Eine brennraumnahe, das Schaftende 22 radial überragende Ringfläche 74 an der Stirnseite der Keilhülse 48 bildet dann eine axiale Anschlagfläche für den Schließkolben 16, wobei zwischen diesem und dem Öffnungskolben 18 ein schmaler axialer Spalt 76 verbleibt, so daß die beiden Kolben 16, 18 nicht miteinander verbunden sind. Da, wie in Fig.2 gezeigt ist, die Keilstücke 44, 46 in Umfangsrichtung gesehen aneinander spaltlos und bündig anschließen und sich zur umlaufenden Keilhülse 48 ergänzen, deren Innendurchmesser geringfügig größer ist als der Außendurchmesser des Schaftendes 22 des Gaswechselventils 1 und weil die Vorsprünge 70 und Ausnehmungen 72 ebenfalls mit Spiel ineinander greifen kann sich kein reibschlüssiger Kontakt zwischen der Umfangsfläche des Schaftendes 22 des Gaswechselventils 1 und der radial inneren Umfangsfläche der Keilhülse 48 ausbilden, der ausreichend wäre, um Drehbewegungen des Schaftendes 22 gegenüber der mit dem Öffnungskolben 18 verschraubten Keilhülse 48 verhindern zu können. Hierdurch bleibt das Gaswechselventil 1 gegenüber dem Ventilsteller 4 frei drehbar. Die Durchmesserdifferenz zwischen dem Innendurchmesser der Keilhülse 48 und dem Außendurchmesser des Schaftendes 22 des Gaswechselventils 1 beträgt vorzugsweise wenige Hundertstel Millimeter. Abschließend wird der Deckel 12 mit der vormontierten Dichtung 38 auf das Stellergehäuse 8 aufgesetzt.When assembling the connection 42, the actuator housing 8 with preassembled bushing 36, preassembled closing piston 16 and preassembled seal 40 is first placed on the cylinder head of the internal combustion engine, wherein the shaft 20 of the gas exchange valve 1 is passed through the closing piston 16 from below , Subsequently, the two wedge pieces 44, 46 are placed through the upper opening 10 of the actuator housing 8 on the shaft end 22 and the opening piston 18 screwed from above onto the thus formed wedge sleeve 48 by a Square key to prevent rotation on the square 58 of the wedge sleeve 48 is placed and at the same time a hex wrench is inserted into the hexagon socket 68 of the opening piston 18, as shown by Fig.2 is easy to imagine. In order to enable a simultaneous application of tools, the hex key must have a central through hole for the shaft of the square socket wrench. As a result of the wedge action, the wedge pieces 44, 46 are braced radially relative to one another and, because of the form-fitting interlocking projections 70 and recesses 72, the shank end 22 is drawn into the conical section 60 of the opening piston 18. A combustion chamber near, the shaft end 22 radially superior annular surface 74 on the front side of the wedge sleeve 48 then forms an axial stop surface for the closing piston 16, between this and the opening piston 18, a narrow axial gap 76 remains, so that the two pistons 16, 18 not with each other are connected. There, as in Fig.2 is shown, the wedge pieces 44, 46 in the circumferential direction join each other without a gap and flush and complement each other to the circumferential wedge sleeve 48 whose inner diameter is slightly larger than the outer diameter of the shaft end 22 of the gas exchange valve 1 and because the projections 70 and recesses 72 also with play into each other can grasp no frictional contact between the peripheral surface of the shaft end 22 of the gas exchange valve 1 and the radially inner peripheral surface of the wedge sleeve 48 form, which would be sufficient to prevent rotational movements of the shaft end 22 relative to the screwed with the opening piston 18 wedge sleeve 48 can. As a result, the gas exchange valve 1 remains freely rotatable relative to the valve actuator 4. The diameter difference between the inner diameter of the wedge sleeve 48 and the outer diameter of the shaft end 22 of the gas exchange valve 1 is preferably a few hundredths of a millimeter. Finally, the cover 12 is placed with the pre-assembled seal 38 on the actuator housing 8.

Vor diesem Hintergrund stellt sich die Funktion des Ventilstellers 4 wie folgt dar : Ausgehend von der in Fig.1 gezeigten Öffnungsstellung wird zum Schließen des Gaswechselventils 1 der untere Arbeitsraum 28 mit Druckmittel beaufschlagt und gleichzeitig der obere Arbeitsraum 34 druckentlastet, so daß der Schließkolben 16 nach oben fährt und über die Ringfläche 74 der Keilhülse 48 und die Verbindung 42 den Öffnungskolben 18 mitnimmt, so daß dieser aus der Bohrung 14 im Deckel 12 herausfahren kann. Umgekehrt wird zum Öffnen des Gaswechselventils 1 der obere Arbeitsraum 34 druckbeaufschlagt und gleichzeitig der untere Arbeitsraum 28 druckentlastet, wodurch der nach unten gedrängte Öffnungskolben 18 den Schließkolben 16 über die Verbindung 42 und die Ringfläche 74 der Keilhülse 48 mitnimmt. Der Kraftfluß vom Öffnungskolben 18 zum Schaftende 22 läuft dabei hauptsächlich über die ineinander greifenden Vorsprünge 70 und Ausnehmungen 72 in formschlüssiger Weise, während die diesen gegenüber axial versetzt angeordneten, verschraubten Gewindeabschnitte 52, 62 lediglich dem radialen Zusammenhalt der Keilstücke 44, 46 dienen, so daß sie im wesentlichen keinen dynamischen Belastungen ausgesetzt sind.Against this background, the function of the valve actuator 4 is as follows: Starting from the in Fig.1 shown opening position is applied to close the gas exchange valve 1, the lower working chamber 28 with pressure and at the same time the upper working chamber 34 relieved of pressure, so that the closing piston 16 moves upward and via the annular surface 74 of the wedge sleeve 48 and the connection 42 the opening piston 18 entrains, so that this can drive out of the bore 14 in the lid 12. Conversely, to open the gas exchange valve 1, the upper working chamber 34 is pressurized and at the same time depressurizes the lower working chamber 28, whereby the downwardly compressed opening piston 18 entrains the closing piston 16 via the connection 42 and the annular surface 74 of the wedge sleeve 48. The power flow from the opening piston 18 to the shaft end 22 runs mainly on the interlocking projections 70 and recesses 72 in a form-fitting manner, while the axially offset, threaded threaded portions 52, 62 serve only the radial cohesion of the wedge pieces 44, 46, so that they are essentially exposed to no dynamic loads.

Bei dem zweiten Ausführungsbeispiel der Erfindung nach Fig.3 sind die gegenüber dem vorhergehenden Beispiel gleichbleibenden und gleichwirkenden Teile durch die gleichen Bezugszahlen gekennzeichnet. Im Unterschied zum vorangehend beschriebenen Ausführungsbeispiel ist der Stellkolben 2 als einstückiger Differentialkolben 78 ausgebildet, die sich in der Öffnungsstellung des Gaswechselventils 1 von der brennraumnahen Bodenöffnung 6 des Stellergehäuses 8 bis zur Bohrung 14 im Deckel 12 erstreckt.In the second embodiment of the invention according to Figure 3 For example, the parts that are the same and function the same as in the previous example are identified by the same reference numerals. In contrast to the embodiment described above, the actuating piston 2 is formed as a one-piece differential piston 78, which is in the open position of the gas exchange valve. 1 extends from the combustion chamber near bottom opening 6 of the actuator housing 8 to the bore 14 in the cover 12.

Claims (11)

  1. Connection (42) between a shank end (22) of a gas exchange valve (1) of an internal combustion engine and a sleeve-shaped actuating piston (2) of a valve adjuster (4), having at least two shell-shaped wedge pieces (44, 46) which surround the shank end (22) and at the radially outer peripheral face of which is provided a section (50) which narrows conically in a direction pointing away from a combustion chamber of the internal combustion engine and which runs in a complementary fashion to the wedge angle of a radially inner conical section (60) of a cone clamping sleeve which encompasses the wedge pieces (44, 46), with it being possible for the cone clamping sleeve and the wedge pieces (44, 46) to be clamped against one another axially, and with projections (70) and recesses (72) which engage into one another being provided on the radially inner peripheral face of the wedge pieces (44, 46) and on the radially outer peripheral face of the shank end (22) of the gas exchange valve (1), characterized in that the cone clamping sleeve is formed by the actuating piston (2), with the actuating piston (2) and the wedge pieces (44, 46) having threaded sections (52, 62) which can be screwed into one another.
  2. Connection according to Claim 1, characterized in that, on the actuating piston (2) and on an encircling wedge sleeve (48) which is composed of the wedge pieces (44, 46), in each case one engagement face (58, 68) for a screwing tool is provided, which engagement faces (58, 68) are designed such that a simultaneous engagement of screwing tools which are assigned to the engagement faces (58, 68) is possible.
  3. Connection according to Claim 2, characterized in that the conical section (50), the threaded section (52) and the engagement face (58) for the screwing tool are arranged axially in series on the wedge sleeve (48) as viewed in a direction pointing away from the combustion chamber.
  4. Connection according to Claim 3, characterized in that the engagement face is embodied as an external square (58) which is arranged with a radial spacing to an engagement face, which is designed as an internal hexagon (68), of the actuating piston (2).
  5. Connection according to Claim 4, characterized in that said connection is radially surrounded by the actuating piston (2), and a hydraulic region (28, 34) which is acted on with pressure medium is arranged in a radially outer region of the actuating piston (2).
  6. Connection according to Claim 5, characterized in that the actuating piston (2) delimits a lower working space (28) with an annular face (24), which is close to the combustion chamber, of a first radially outer shoulder (26), and delimits an upper working space (34) with an upper annular face (30) of a second radially outer shoulder (32), with it being possible for the working spaces (28, 34) to be filled with or emptied of a pressure medium.
  7. Connection according to Claim 6, characterized in that the actuating piston (2) is guided axially in a running sleeve (36) which is held in an adjuster housing (8).
  8. Connection according to Claim 7, characterized in that the actuating piston (2) is of two-part design and contains a closing piston (16) which is close to the combustion chamber and an opening piston (18), which adjoins said closing piston (16) axially, operates in the opposite direction and is remote from the combustion chamber, with the closing piston (16) being assigned to the lower working space (28) and the opening piston (18) being assigned to the upper working space (34), and the conical section (60) and the threaded section (62) being arranged on the opening piston (18).
  9. Connection according to Claim 8, characterized in that an annular face (74), which is close to the combustion chamber, on the end side of the wedge sleeve (48) forms, while projecting radially beyond the shank end (22), an axial stop face for the closing piston (16), with the opening piston (18) extending substantially up to said annular face (74).
  10. Connection according to one of Claims 1 to 7, characterized in that the actuating piston (2) is designed as a single-piece differential piston (78).
  11. Connection according to one of the preceding claims, characterized in that the wedge pieces (44, 46) adjoin one another without a gap as viewed in the peripheral direction and together form an encircling wedge sleeve (48) whose inner diameter is slightly larger than the outer diameter of the shank end (22) of the gas exchange valve (1), and in that the projections (70) and recesses (72) engage into one another with slight play.
EP02729823A 2001-03-30 2002-03-27 Connection between a stem end of a gas exchange valve in an internal combustion engine and a sleeve-shaped control piston on a tappet Expired - Lifetime EP1377732B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10116218A DE10116218A1 (en) 2001-03-30 2001-03-30 Connection between a shaft end of a gas exchange valve of an internal combustion engine and a sleeve-shaped actuating piston of a valve actuator
DE10116218 2001-03-30
PCT/DE2002/001125 WO2002079612A1 (en) 2001-03-30 2002-03-27 Connection between a stem end of a gas exchange valve in an internal combustion engine and a sleeve-shaped control piston on a tappet

Publications (2)

Publication Number Publication Date
EP1377732A1 EP1377732A1 (en) 2004-01-07
EP1377732B1 true EP1377732B1 (en) 2008-02-13

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EP02729823A Expired - Lifetime EP1377732B1 (en) 2001-03-30 2002-03-27 Connection between a stem end of a gas exchange valve in an internal combustion engine and a sleeve-shaped control piston on a tappet

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US (1) US6729287B2 (en)
EP (1) EP1377732B1 (en)
JP (1) JP4083022B2 (en)
KR (1) KR20030065312A (en)
DE (2) DE10116218A1 (en)
WO (1) WO2002079612A1 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10141176A1 (en) * 2001-08-22 2003-03-20 Bosch Gmbh Robert Detachable connection for coupling a gas exchange valve of an internal combustion engine to an actuator
US7455798B2 (en) * 2002-08-23 2008-11-25 James Hardie International Finance B.V. Methods for producing low density products
DE10256242A1 (en) 2002-12-02 2004-06-09 Robert Bosch Gmbh Valve actuator for actuating a gas exchange valve of an internal combustion engine
DE10321157A1 (en) 2003-05-12 2004-12-02 Robert Bosch Gmbh Valve actuator for gas exchange valve of IC engines has threaded sleeve connected to actuator piston and also clamping wedge parts
AT501335B1 (en) * 2005-01-19 2007-05-15 Avl List Gmbh Method for operating internal combustion engine, involves locating brake valve on each cylinder, and opening brake valve into common pressure container during engine operation before start or during compression phase of cylinder
DE202009017700U1 (en) * 2009-11-18 2010-06-02 Daude, Otto, Dr.-Ing. MBA Counter-piston engine with gas exchange control via hydrostatically operated sliding bushes
DE102019207536A1 (en) * 2019-05-23 2020-11-26 Mahle International Gmbh Gas exchange valve

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR931101A (en) 1945-07-23 1948-02-13 Eaton Mfg Co Improvements to a valve for an internal combustion engine
US5003940A (en) * 1990-07-25 1991-04-02 Hixson William J Quick adjust tappet assembly
DE4117406A1 (en) * 1991-05-28 1992-12-03 Freudenberg Carl Fa VALVE DRIVE IN THE CYLINDER HEAD OF AN INTERNAL COMBUSTION ENGINE
US5231959A (en) * 1992-12-16 1993-08-03 Moog Controls, Inc. Intake or exhaust valve actuator
US5701930A (en) * 1995-05-01 1997-12-30 Russell; Robert L. Modular valve assembly
SE511768C2 (en) * 1998-02-23 1999-11-22 Atlas Copco Rocktech Ab Device and method for jointing of rods, and piston pump comprising the device
DE19826046A1 (en) 1998-06-12 1999-12-16 Bosch Gmbh Robert Valve control device for an internal combustion engine
DE10040114A1 (en) 2000-08-17 2002-02-28 Bosch Gmbh Robert Connection between a shaft end of a gas exchange valve of an internal combustion engine and an actuator of a valve actuator

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US20030177995A1 (en) 2003-09-25
WO2002079612A1 (en) 2002-10-10
DE50211673D1 (en) 2008-03-27
EP1377732A1 (en) 2004-01-07
DE10116218A1 (en) 2002-10-10
US6729287B2 (en) 2004-05-04
KR20030065312A (en) 2003-08-06
JP4083022B2 (en) 2008-04-30
JP2004518893A (en) 2004-06-24

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