EP1570160B1 - Valve actuator for actuating a gas exchange valve of an internal combustion engine - Google Patents

Valve actuator for actuating a gas exchange valve of an internal combustion engine Download PDF

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Publication number
EP1570160B1
EP1570160B1 EP03812118A EP03812118A EP1570160B1 EP 1570160 B1 EP1570160 B1 EP 1570160B1 EP 03812118 A EP03812118 A EP 03812118A EP 03812118 A EP03812118 A EP 03812118A EP 1570160 B1 EP1570160 B1 EP 1570160B1
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EP
European Patent Office
Prior art keywords
valve
valve actuator
wedge pieces
actuator according
threaded pin
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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.)
Expired - Lifetime
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EP03812118A
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German (de)
French (fr)
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EP1570160A1 (en
Inventor
Uwe Hammer
Peter Lang
Stefan Reimer
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP1570160A1 publication Critical patent/EP1570160A1/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
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/46—Component parts, details, or accessories, not provided for in preceding subgroups
    • 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
    • Y10T74/00—Machine element or mechanism
    • Y10T74/21—Elements
    • Y10T74/2142—Pitmans and connecting rods

Definitions

  • the invention relates to a valve actuator for actuating a gas exchange valve of an internal combustion engine, according to the preamble of claim 1.
  • Such a valve actuator is from the DE 10 116 218 A1 in which a shaft end of the gas exchange valve is connected to an actuating piston of the valve actuator by means of at least two shank-shaped wedge pieces enclosing the shaft end, axially supporting on the control piston, whose radially outer circumferential surface is conical and is enclosed by a cone clamping sleeve.
  • the Konusspannhülse has a radially inner peripheral surface which extends complementary to the cone angle of the wedge pieces and is axially clamped against them by a formed on the wedge pieces threaded connection. Due to the formation of cone angle and threaded connection to the wedge pieces these are relatively complex components that are very expensive to manufacture in production.
  • a threaded bolt is provided for connecting the gas exchange valve to the valve actuator, which is axially positively connected and rotatably connected to the wedge pieces.
  • the wedge pieces may extend beyond the shaft end in the axial extension of the valve actuator, where they are connected to the threaded bolt there.
  • the wedge pieces are then tapered conically with increasing distance from the gas exchange valve and clamped on the formed on the threaded bolt thread with the Konusspannhülse.
  • the Konusspannhülse is integrally formed by the actuating piston and the threaded portion with a corresponding threaded portion on a radially inner peripheral surface of the actuating piston is engaged, the number of parts of the valve actuator can be reduced.
  • the threaded bolt can be connected to the wedge pieces via engaging in annular grooves annular beads which are arranged annularly circumferentially on the wedge pieces or on the threaded bolt.
  • FIG. 1 From a valve train of an internal combustion engine is in FIG. 1 a gas exchange valve 1 is shown, which is actuated by an actuating piston 2 of a valve actuator 4 such that it performs in the axial direction up and down opening and closing movements.
  • the gas exchange valve 1 has in known manner a valve stem 5, which extends in the axial direction of the combustion chamber of the internal combustion engine away.
  • the valve stem 5 has a combustion chamber remote shank end 5a, which is surrounded by two half-shell-shaped wedge pieces 6, 7.
  • the shank end 5a has at least one annular groove 8, in which at least one, formed on the inner circumference of the wedge pieces 6, 7 annular bead 9 engages radially.
  • a total of three axially equidistantly angeordete annular grooves 8 on the valve stem 5 and three corresponding annular beads 9 are provided.
  • the annular beads 9 are thereby formed by substantially semicircular Operawülsten to the two wedge pieces 6,7, which complement each other in a circle to the annular beads 9.
  • the wedge pieces 6, 7 form on its outer circumferential surface a cone-shaped portion 10, which tapers with increasing distance from the gas exchange valve 1.
  • the two wedge pieces 6, 7 together form a clamping wedge 11 which cooperates with a corresponding conical inner surface 12 of a cone clamping sleeve 13.
  • the Konusspannhülse 13 is integrally formed at a combustion chamber facing the end 14 of the actuating piston 2 with this.
  • the actuator piston 2 extends in the axial direction along an axis 15 concentric with a longitudinal axis 17 of the valve stem 5 of the gas exchange valve 1.
  • the valve actuator 4 has a regulator housing 20, which is penetrated axially by the actuating piston 2.
  • a guide sleeve 18 within which the actuating piston 2 is guided axially displaceably via a guide collar 23 on the actuating piston 2.
  • a first chamber 22 is formed on the combustion chamber side facing the guide collar 23, which is connected by a first opening 21 in the wall of the actuator housing 20 with a first pressure medium line not shown.
  • the first chamber 22 is thereby limited by the actuator housing 20, the guide sleeve 18 and the actuating piston 2 including the guide collar 23.
  • a first sealing ring 26 prevents that in the first chamber 22 befindliches pressure medium, such as hydraulic fluid, via a first annular gap 24 exits the actuator housing 20.
  • a second chamber 25 is formed on the combustion chamber facing away from the side of the guide collar 23, which is connected by a second opening 27 in the wall of the actuator housing 20 with a likewise not shown second pressure medium line.
  • the second chamber 25 is also limited by the actuator housing 20, the guide sleeve 18 and the actuating piston 2 including the guide collar 23.
  • a second sealing ring 28 prevents pressure medium located in the second chamber 25 from exiting the actuator housing 20 via a second annular gap 29.
  • the actuating piston 2 is formed as a hollow cylinder. There is a constriction 38 on the inner periphery of the actuating piston 2 between the conical sleeve 13 close to the combustion chamber and a combustion chamber distal end 2a of the actuating piston 2. In the region of the constriction 38, an internal thread 39 is formed, which engages with a corresponding external thread 40 on a threaded bolt 41.
  • the threaded bolt 41 is arranged concentrically within the actuating piston 2.
  • the external thread 40 extends axially through a threaded portion 31 on the threaded bolt 41 and is at least partially in engagement with the external thread 40.
  • the threaded bolt 41 is axially positively connected, rotatably connected in the circumferential direction with the valve stem 5.
  • the Konusspannhülse 13 and the wedge pieces 6, 7 are extended axially beyond the shank end 5a of the valve stem 5, wherein they surround a combustion chamber near the end 41a of the threaded bolt 41.
  • at least one radial projection 42 is provided on the inner circumference of the clamping wedge 11, which in the example is designed as an annular circumferential bead which engages radially in at least one recess 43 on the outer circumference of the threaded bolt 41.
  • the recess 43 is formed in the example as an annular circumferential groove and there are a total of three axially equidistantly angeordete beads 42 on the clamping wedge 11 and three corresponding grooves 43 on the threaded bolt 41, in which the beads 42 engage radially.
  • a combustion chamber remote end 41b of the threaded bolt 41 is formed as an external hexagon 45 for attaching a screwing tool, not shown.
  • the threaded bolt 41 can be screwed into the internal thread 39, wherein due to the positive connection with the clamping wedge 11 of the clamping wedge 11 with the cone clamping sleeve 13 is braced axially and radially.
  • the adjusting piston 2 does not rotate during insertion of the threaded bolt 41 due to frictional engagement, a second, also hexagonal trained tool for holding in a tool holder 46 can be recognized at the shaft end 2a.
  • FIG. 3 shows that the two wedge pieces 6, 7 bear radially in the form of a half shell on the cone clamping sleeve.
  • the gas exchange valve 1 is inserted into the valve stem guide of the cylinder head (not shown) and then the wedge pieces 6, 7 placed on the shaft end 5a. In this case also the end 41a of the threaded bolt 41 between the wedge pieces 6, 7 is fixed. Subsequently, the valve actuator 4 is placed from above on the preassembled components gas exchange valve 1, threaded bolt 41 and wedge pieces 6, 7, until the outer surface of the clamping wedge 11 rests against the inner cone surface 11. Then a screwing in the control piston 2 is guided to the hexagon socket 45 and the threaded bolt 41 axially adjusted by turning over the thread 37, 39. In this way, the clamping wedge 11 and the cone clamping sleeve 13 are clamped together. Possibly. the actuator piston 2 must be fixed in the direction of rotation via another tool.
  • the applicability of the present invention is not limited to the above-described embodiment.
  • numerous change possibilities are conceivable in the concrete embodiment, which do not significantly change the meaning of the invention.
  • the adjusting piston 2 could be accommodated more or less completely in the actuator housing 20.
  • the number of grooves 9, 43 and beads 8, 42 can be varied.
  • the grooves or beads may each be formed on the other component, without changing the operation of the valve actuator.
  • the Starting points for lathe tools can be performed deviating from the described embodiment.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Lift Valve (AREA)

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem Ventilsteller zur Betätigung eines Gaswechselventils einer Brennkraftmaschine, gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a valve actuator for actuating a gas exchange valve of an internal combustion engine, according to the preamble of claim 1.

Ein derartiger Ventilsteller ist aus der DE 10 116 218 A1 bekannt, bei dem ein Schaftende des Gaswechselventils mit einem Stellkolben des Ventilstellers mittels wenigstens zwei das Schaftende umschließenden, sich am Stellkolben axial abstützenden, schalenförmigen Keilstücken verbunden ist, deren radial äußere Umfangsfläche konisch verläuft und von einer Konusspannhülse umfasst ist. Die Konusspannhülse hat eine radial innere Umfangsfläche, die komplementär zum Konuswinkel der Keilstücke verläuft und gegen diese durch eine an den Keilstücken ausgebildete Gewindeverbindung axial verspannt ist. Bedingt durch die Ausbildung von Konuswinkel und Gewindeverbindung an den Keilstücken sind diese relativ komplexe Bauteile, die in der Fertigung sehr aufwändig herzustellen sind.Such a valve actuator is from the DE 10 116 218 A1 in which a shaft end of the gas exchange valve is connected to an actuating piston of the valve actuator by means of at least two shank-shaped wedge pieces enclosing the shaft end, axially supporting on the control piston, whose radially outer circumferential surface is conical and is enclosed by a cone clamping sleeve. The Konusspannhülse has a radially inner peripheral surface which extends complementary to the cone angle of the wedge pieces and is axially clamped against them by a formed on the wedge pieces threaded connection. Due to the formation of cone angle and threaded connection to the wedge pieces these are relatively complex components that are very expensive to manufacture in production.

Vorteile der ErfindungAdvantages of the invention

Erfindungsgemäß ist zur Verbindung des Gaswechselventils mit dem Ventilsteller ein Gewindebolzen vorgesehen, der mit den Keilstücken axial formschlüssig und drehbar verbunden ist. Durch die Ausbildung der Funktionen Konuswinkel und Gewindeverbindung an separaten Bauteilen lässt sich der Fertigungsaufwand erheblich verringern.According to the invention, a threaded bolt is provided for connecting the gas exchange valve to the valve actuator, which is axially positively connected and rotatably connected to the wedge pieces. By designing the functions cone angle and threaded connection to separate components, the production cost can be significantly reduced.

Durch die in den abhängigen Ansprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen der im Patentanspruch 1 angegebenen Erfindung möglich. So können sich die Keilstücke gemäß einer bevorzugten Ausführungsform in axialer Verlängerung des Ventilstellers über das Schaftende hinaus erstrecken, wobei sie dort mit dem Gewindebolzen verbunden sind. Die Keilstücke sind dann sich mit zunehmender Entfernung vom Gaswechselventil konisch verjüngend ausgebildet und über das am Gewindebolzen ausgebildete Gewinde mit der Konusspannhülse verspannt.The measures listed in the dependent claims advantageous refinements and improvements of the invention in claim 1 invention are possible. Thus, according to a preferred embodiment, the wedge pieces may extend beyond the shaft end in the axial extension of the valve actuator, where they are connected to the threaded bolt there. The wedge pieces are then tapered conically with increasing distance from the gas exchange valve and clamped on the formed on the threaded bolt thread with the Konusspannhülse.

Indem die Konusspannhülse einstückig durch den Stellkolben gebildet wird und der Gewindeabschnitt mit einem korrespondierenden Gewindeabschnitt an einer radial inneren Umfangsfläche des Stellkolbens im Eingriff steht, lässt sich die Teilezahl des Ventilstellers verringern.By the Konusspannhülse is integrally formed by the actuating piston and the threaded portion with a corresponding threaded portion on a radially inner peripheral surface of the actuating piston is engaged, the number of parts of the valve actuator can be reduced.

In besonders einfacher Weise lässt sich der Gewindebolzen mit den Keilstücken über in Ringnuten eingreifende Ringwülste verbinden, die an den Keilstücken bzw. am Gewindebolzen ringförmig umlaufend angeordnet sind.In a particularly simple manner, the threaded bolt can be connected to the wedge pieces via engaging in annular grooves annular beads which are arranged annularly circumferentially on the wedge pieces or on the threaded bolt.

Zeichnungendrawings

Ausführungsbeispiele der Erfindung sind in den Zeichnungen dargestellt und in der nachfolgenden Beschreibung näher erläutert.Embodiments of the invention are illustrated in the drawings and explained in more detail in the following description.

Es zeigen:

Figur 1
eine seitliche Querschnittsdarstellung einer bevorzugten Ausführungsform eines erfindungsgemäßen Ventilstellers;
Figur 2
eine Querschnittsdarstellung entlang der Linie II-II in Figur 1.
Figur 3
eine Querschnittsdarstellung entlang der Linie III-III in Figur I
Show it:
FIG. 1
a side cross-sectional view of a preferred embodiment of a valve actuator according to the invention;
FIG. 2
a cross-sectional view along the line II-II in FIG. 1 ,
FIG. 3
a cross-sectional view along the line III-III in Figure I.

Beschreibung des AusführungsbeispielsDescription of the embodiment

Von einem Ventiltrieb einer Brennkraftmaschine ist in Figur 1 ein Gaswechselventil 1 gezeigt, welches durch einen Stellkolben 2 eines Ventilstellers 4 derart betätigt wird, dass es in axialer Richtung auf- und abwärtsgehende Öffnungs- und Schließbewegungen ausführt.From a valve train of an internal combustion engine is in FIG. 1 a gas exchange valve 1 is shown, which is actuated by an actuating piston 2 of a valve actuator 4 such that it performs in the axial direction up and down opening and closing movements.

Das Gaswechselventil 1 hat in bekannter Weise einen Ventilschaft 5, der sich in axialer Richtung vom Brennraum der Brennkraftmaschine weg erstreckt. Der Ventilschaft 5 hat ein brennraumfernes Schaftende 5a, das von zwei halbschalenförmigen Keilstücken 6, 7 umgeben ist. Das Schaftende 5a hat dabei mindestens eine Ringnut 8, in die mindestens eine, am inneren Umfang der Keilstücke 6, 7 ausgebildete Ringwulst 9 radial eingreift. Im Beispielsfall sind insgesamt drei axial äquidistant angeordete Ringnuten 8 am Ventilschaft 5 und drei korrespondierende Ringwülste 9 vorgesehen. Die Ringwülste 9 werden dabei von im Wesentlichen halbkreisförmigen Teilwülsten an den beiden Keilstücken 6,7 gebildet, die sich kreisförmig zu den Ringwülsten 9 ergänzen.The gas exchange valve 1 has in known manner a valve stem 5, which extends in the axial direction of the combustion chamber of the internal combustion engine away. The valve stem 5 has a combustion chamber remote shank end 5a, which is surrounded by two half-shell-shaped wedge pieces 6, 7. The shank end 5a has at least one annular groove 8, in which at least one, formed on the inner circumference of the wedge pieces 6, 7 annular bead 9 engages radially. In the example, a total of three axially equidistantly angeordete annular grooves 8 on the valve stem 5 and three corresponding annular beads 9 are provided. The annular beads 9 are thereby formed by substantially semicircular Teilwülsten to the two wedge pieces 6,7, which complement each other in a circle to the annular beads 9.

Die Keilstücke 6, 7 bilden auf ihrer äußeren Umfangsfläche einen konusmantelförmigen Abschnitt 10, der sich mit zunehmender Entfernung vom Gaswechselventil 1 verjüngt. Die beiden Keilstücke 6, 7 bilden zusammen einen Klemmkeil 11, der mit einer korrespondierenden Konusinnenfläche 12 einer Konusspannhülse 13 zusammenwirkt. Die Konusspannhülse 13 ist an einem brennraumzugewandten Ende 14 des Stellkolbens 2 einstückig mit diesem ausgebildet.The wedge pieces 6, 7 form on its outer circumferential surface a cone-shaped portion 10, which tapers with increasing distance from the gas exchange valve 1. The two wedge pieces 6, 7 together form a clamping wedge 11 which cooperates with a corresponding conical inner surface 12 of a cone clamping sleeve 13. The Konusspannhülse 13 is integrally formed at a combustion chamber facing the end 14 of the actuating piston 2 with this.

Der Stellkolben 2 erstreckt sich in axialer Richtung entlang einer Achse 15 konzentrisch zu einer Längsachse 17 des Ventilschaftes 5 des Gaswechselventils 1. Der Ventilsteller 4 hat ein Stellergehäuse 20, das vom Stellkolben 2 axial durchragt wird. Im Stellergehäuse 20 befindet sich eine Führungshülse 18, innerhalb der der Stellkolben 2 über einen Führungsbund 23 am Stellkolben 2 axial verschiebbar geführt ist. Im Stellergehäuse 20 ist auf der dem Brennraum zugewandten Seite des Führungsbundes 23 eine erste Kammer 22 gebildet, die durch eine erste Öffnung 21 in der Wandung des Stellergehäuses 20 mit einer nicht näher dargestellten ersten Druckmitteleitung verbunden ist. Die erste Kammer 22 wird dabei von dem Stellergehäuse 20, der Führungshülse 18 und dem Stellkolben 2 einschließlich des Führungsbundes 23 begrenzt. Ein erster Dichtring 26 verhindert, dass in der ersten Kammer 22 befindliches Druckmittel, beispielsweise Hydraulikflüssigkeit, über einen ersten Ringspalt 24 aus dem Stellergehäuse 20 austritt.The actuator piston 2 extends in the axial direction along an axis 15 concentric with a longitudinal axis 17 of the valve stem 5 of the gas exchange valve 1. The valve actuator 4 has a regulator housing 20, which is penetrated axially by the actuating piston 2. In the actuator housing 20 is a guide sleeve 18, within which the actuating piston 2 is guided axially displaceably via a guide collar 23 on the actuating piston 2. In the actuator housing 20, a first chamber 22 is formed on the combustion chamber side facing the guide collar 23, which is connected by a first opening 21 in the wall of the actuator housing 20 with a first pressure medium line not shown. The first chamber 22 is thereby limited by the actuator housing 20, the guide sleeve 18 and the actuating piston 2 including the guide collar 23. A first sealing ring 26 prevents that in the first chamber 22 befindliches pressure medium, such as hydraulic fluid, via a first annular gap 24 exits the actuator housing 20.

Im Stellergehäuse 20 ist auf der dem Brennraum abgewandten Seite des Führungsbundes 23 eine zweite Kammer 25 gebildet, die durch eine zweite Öffnung 27 in der Wandung des Stellergehäuses 20 mit einer ebenfalls nicht näher dargestellten zweiten Druckmittelleitung verbunden ist. Die zweite Kammer 25 wird dabei ebenfalls von dem Stellergehäuse 20, der Führungshülse 18 und dem Stellkolben 2 einschließlich des Führungsbundes 23 begrenzt. Ein zweiter Dichtring 28 verhindert, dass in der zweiten Kammer 25 befindliches Druckmittel über einen zweiten Ringspalt 29 aus dem Stellergehäuse 20 austritt.In the actuator housing 20, a second chamber 25 is formed on the combustion chamber facing away from the side of the guide collar 23, which is connected by a second opening 27 in the wall of the actuator housing 20 with a likewise not shown second pressure medium line. The second chamber 25 is also limited by the actuator housing 20, the guide sleeve 18 and the actuating piston 2 including the guide collar 23. A second sealing ring 28 prevents pressure medium located in the second chamber 25 from exiting the actuator housing 20 via a second annular gap 29.

Der Stellkolben 2 ist hohlzylindrisch ausgebildet. Zwischen der brennraumnahen Konushülse 13 und einem brennraumfernen Ende 2a des Stellkolbens 2 befindet sich eine Einschnürung 38 am Innenumfang des Stellkolbens 2. Im Bereich der Einschnürung 38 ist ein Innengewinde 39 ausgebildet, das mit einem korrespondierenden Außengewinde 40 an einem Gewindebolzen 41 im Eingriff steht. Der Gewindebolzen 41 ist konzentrisch innerhalb des Stellkolbens 2 angeordnet. Das Außengewinde 40 erstreckt sich über einen Gewindeabschnitt 31 axial am Gewindebolzen 41 und steht zumindest teilweise mit dem Außengewinde 40 im Eingriff.The actuating piston 2 is formed as a hollow cylinder. There is a constriction 38 on the inner periphery of the actuating piston 2 between the conical sleeve 13 close to the combustion chamber and a combustion chamber distal end 2a of the actuating piston 2. In the region of the constriction 38, an internal thread 39 is formed, which engages with a corresponding external thread 40 on a threaded bolt 41. The threaded bolt 41 is arranged concentrically within the actuating piston 2. The external thread 40 extends axially through a threaded portion 31 on the threaded bolt 41 and is at least partially in engagement with the external thread 40.

Der Gewindebolzen 41 ist axial formschlüssig, in Umfangsrichtung drehbar mit dem Ventilschaft 5 verbunden. Hierzu sind die Konusspannhülse 13 und die Keilstücke 6, 7 axial über das Schaftendes 5a des Ventilschaftes 5 hinaus verlängert, wobei sie ein brennraumnahes Ende 41a des Gewindebolzens 41 umgreifen. Im Bereich des Endes 41a ist am inneren Umfang des Klemmkeils 11 wenigstens ein radialer Vorsprung 42 vorgesehen, der im Beispielsfall als ringförmig umlaufende Wulst ausgebildet ist, die radial in wenigstens eine Vertiefung 43 am Außenumfang des Gewindebolzens 41 eingreift. Die Vertiefung 43 ist im Beispielsfall als ringförmig umlaufende Nut ausgebildet und es sind insgesamt drei axial äquidistant angeordete Wülste 42 an dem Klemmkeil 11 und drei korrespondierende Nuten 43 am Gewindebolzen 41 angeordnet, in die die Wülste 42 radial eingreifen.The threaded bolt 41 is axially positively connected, rotatably connected in the circumferential direction with the valve stem 5. For this purpose, the Konusspannhülse 13 and the wedge pieces 6, 7 are extended axially beyond the shank end 5a of the valve stem 5, wherein they surround a combustion chamber near the end 41a of the threaded bolt 41. In the region of the end 41a, at least one radial projection 42 is provided on the inner circumference of the clamping wedge 11, which in the example is designed as an annular circumferential bead which engages radially in at least one recess 43 on the outer circumference of the threaded bolt 41. The recess 43 is formed in the example as an annular circumferential groove and there are a total of three axially equidistantly angeordete beads 42 on the clamping wedge 11 and three corresponding grooves 43 on the threaded bolt 41, in which the beads 42 engage radially.

Wie aus Figur 2 hervorgeht, ist ein brennraumfernes Ende 41b des Gewindebolzens 41 als Außensechskant 45 zum Ansetzen eines nicht dargestellten Schraubwerkzeuges ausgebildet. Mittels des Schraubwerkzeuges lässt sich der Gewindebolzen 41 in das Innengewinde 39 einschrauben, wobei wegen des Formschlusses mit dem Klemmkeil 11 der Klemmkeil 11 mit der Konusspannhülse 13 axial und radial verspannt wird. Damit sich der Stellkolben 2 beim Eindrehen des Gewindebolzens 41 wegen Reibschluß nicht mitdreht, kann am Schaftende 2a ein zweites, ebenfalls sechskantig ausgebildetes Werkzeug zum Gegenhalten in einer Werkzeugaufnahme 46 angesetzt werden.How out FIG. 2 shows, a combustion chamber remote end 41b of the threaded bolt 41 is formed as an external hexagon 45 for attaching a screwing tool, not shown. By means of the screwing tool, the threaded bolt 41 can be screwed into the internal thread 39, wherein due to the positive connection with the clamping wedge 11 of the clamping wedge 11 with the cone clamping sleeve 13 is braced axially and radially. Thus, the adjusting piston 2 does not rotate during insertion of the threaded bolt 41 due to frictional engagement, a second, also hexagonal trained tool for holding in a tool holder 46 can be recognized at the shaft end 2a.

Aus Figur 3 geht hervor, dass die beiden Keilstücke 6, 7 halbschalenförmig an der Konusspannhülse radial anliegen.Out FIG. 3 shows that the two wedge pieces 6, 7 bear radially in the form of a half shell on the cone clamping sleeve.

Vor diesem Hintergrund stellt sich die Funktion des Ventilstellers wie folgt dar:

  • In Fig. 1 ist das Gaswechselventil 1 in einer Öffnungsstellung gezeigt, bei der beide Kammern 22, 25 über die Druckmittelleitungen mit Druck beaufschlagt sind. Aufgrund der geringeren axialen Kolbenfläche des Stellkolbens 2 an der ersten Kammer 22 ist der Stellkolben 2 zum Brennraum hin axial verstellt. Zum Schliessen des Gaswechselventils 1 wird die zweite Kammer 25 druckentlastet, die erste Kammer 22 bleibt stets druckbeaufschlagt. Aufgrund des in der ersten Kammer 22 vorhandenen Überdrucks wird der Stellkolben 2 dann nach oben in Richtung auf die zweite Kammer 25 hin verschoben.
Against this background, the function of the valve actuator is as follows:
  • In Fig. 1 the gas exchange valve 1 is shown in an open position, in which both chambers 22, 25 are acted upon by the pressure medium lines with pressure. Due to the smaller axial piston area of the actuating piston 2 on the first chamber 22, the actuating piston 2 is axially displaced toward the combustion chamber. To close the gas exchange valve 1, the second chamber 25 is depressurized, the first chamber 22 is always pressurized. Due to the overpressure present in the first chamber 22, the actuating piston 2 is then displaced upward in the direction of the second chamber 25.

Zur Montage des Ventilstellers 4 wird das Gaswechselventil 1 in die Ventilschschaftführung des Zylinderkopfes (nicht dargestellt) eingeführt und anschließend die Keilstücke 6, 7 am Schaftende 5a aufgesetzt. Dabei wird auch gleich das Ende 41a des Gewindebolzens 41 zwischen den Keilstücken 6, 7 festgelegt. Anschließend wird der Ventilsteller 4 von oben auf die vormontierten Bauteile Gaswechselventil 1, Gewindebolzen 41 und Keilstücke 6, 7 aufgesetzt, bis die Außenfläche des Klemmkeiles 11 an der Konusinnenfläche 11 anliegt. Daraufhin wird ein Schraubwerkzeug im Stellkolben 2 zum Aussensechskant 45 geführt und der Gewindebolzen 41 durch Drehen über das Gewinde 37, 39 axial verstellt. Auf diese Weise werden der Klemmkeil 11 und die Konusspannhülse 13 miteinander verspannt. Ggf. muss der Stellkolben 2 dabei über ein anderes Werkzeug in Drehrichtung fixiert werden.For mounting the valve actuator 4, the gas exchange valve 1 is inserted into the valve stem guide of the cylinder head (not shown) and then the wedge pieces 6, 7 placed on the shaft end 5a. In this case also the end 41a of the threaded bolt 41 between the wedge pieces 6, 7 is fixed. Subsequently, the valve actuator 4 is placed from above on the preassembled components gas exchange valve 1, threaded bolt 41 and wedge pieces 6, 7, until the outer surface of the clamping wedge 11 rests against the inner cone surface 11. Then a screwing in the control piston 2 is guided to the hexagon socket 45 and the threaded bolt 41 axially adjusted by turning over the thread 37, 39. In this way, the clamping wedge 11 and the cone clamping sleeve 13 are clamped together. Possibly. the actuator piston 2 must be fixed in the direction of rotation via another tool.

Die Anwendbarkeit der vorliegenden Erfindung ist nicht auf das vorstehend beschriebene Ausführungsbeispiel beschränkt. So sind zahlreiche Anderungsmöglichkeiten bei der konkreten Ausführung denkbar, die den Sinngehalt der Erfindung nicht wesentlich verändern. So könnte beispielsweise der Stellkolben 2 mehr oder weniger vollständig in dem Stellergehäuse 20 untergebracht sein. Die Anzahl der Nuten 9, 43 und Wülste 8, 42 lässt sich variieren. Auch können die Nuten bzw. Wülste jeweils am anderen Bauteil ausgebildet sein, ohne die Wirkungsweise des Ventilstellers zu verändern. Die Ansatzstellen für Drehwerkzeuge können von der beschriebenen Ausführung abweichend ausgeführt sein.The applicability of the present invention is not limited to the above-described embodiment. Thus, numerous change possibilities are conceivable in the concrete embodiment, which do not significantly change the meaning of the invention. For example, the adjusting piston 2 could be accommodated more or less completely in the actuator housing 20. The number of grooves 9, 43 and beads 8, 42 can be varied. Also, the grooves or beads may each be formed on the other component, without changing the operation of the valve actuator. The Starting points for lathe tools can be performed deviating from the described embodiment.

Claims (8)

  1. Valve actuator for actuating a gas exchange valve of an internal combustion engine, having a sleeve-like actuating piston (2) which is connected to a valve shank (5), having at least two shell-like wedge pieces (6, 7) which surround a shank end (5a) of the valve shank (5) and on the radially outer peripheral surface of which is provided a conical-surface-shaped section (10) which tapers with increasing distance from the gas exchange valve (1), which conical-surface-shaped section (10) is at least partially surrounded by a cone clamping sleeve (13) with a corresponding cone inner surface (12), and is connected to the actuating piston (2), characterized in that the wedge pieces (6, 7) are connected in an axially form-fitting and rotatable manner to a threaded pin (41), with the threaded pin (41) having at least one threaded section (31) by means of which the wedge pieces (6, 7) and the cone clamping sleeve (13) can be axially clamped to one another.
  2. Valve actuator according to Claim 1, characterized in that the wedge pieces (6, 7) extend beyond the shank end (5a) as an axial elongation of the valve shank (5) and, there, engage partially around the threaded pin (41) in an axially form-fitting manner.
  3. Valve actuator according to Claim 1 or 2, characterized in that the cone clamping sleeve (13) is formed by the actuating piston (2) and the threaded section (31) is at least partially in engagement with a corresponding thread (39) on the actuating piston (2).
  4. Valve actuator according to Claim 3, characterized in that the threaded section (31) extends in the axial direction on an outer periphery of the threaded pin (41).
  5. Valve actuator according to Claim 4, characterized in that at least one radial projection (42) is formed on the outer periphery of the threaded pin (41), which radial projection (42) engages radially into at least one radial depression (43) on an inner surface of the wedge pieces (6, 7).
  6. Valve actuator according to Claim 5, characterized in that the at least one radial depression (43) or the at least one radial projection (42) is arranged in an annularly encircling fashion.
  7. Valve actuator according to Claim 6, characterized in that the at least one depression (43) on the threaded pin (41) is arranged in the region of that end (41a) of said threaded pin (41) which faces toward the valve shank (5), and in that the threaded section (31) is behind the shank end (5a) as viewed in the axial direction from the gas exchange valve (1).
  8. Valve actuator according to Claim 7, characterized in that a total of three encircling depressions (43) are arranged on the threaded pin (41), into which depressions (43) engage in each case three corresponding projections (42) on the wedge pieces (6, 7).
EP03812118A 2002-12-02 2003-06-04 Valve actuator for actuating a gas exchange valve of an internal combustion engine Expired - Lifetime EP1570160B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10256242A DE10256242A1 (en) 2002-12-02 2002-12-02 Valve actuator for actuating a gas exchange valve of an internal combustion engine
DE10256242 2002-12-02
PCT/DE2003/001853 WO2004051058A1 (en) 2002-12-02 2003-06-04 Valve actuator for actuating a gas exchange valve of an internal combustion engine

Publications (2)

Publication Number Publication Date
EP1570160A1 EP1570160A1 (en) 2005-09-07
EP1570160B1 true EP1570160B1 (en) 2008-11-05

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EP03812118A Expired - Lifetime EP1570160B1 (en) 2002-12-02 2003-06-04 Valve actuator for actuating a gas exchange valve of an internal combustion engine

Country Status (5)

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US (1) US7360517B2 (en)
EP (1) EP1570160B1 (en)
JP (1) JP4221376B2 (en)
DE (2) DE10256242A1 (en)
WO (1) WO2004051058A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1489160A (en) 1966-06-07 1967-07-21 Device for fixing a tool holder at the edge of the spindle
JP2664986B2 (en) 1989-04-03 1997-10-22 三菱重工業株式会社 Valve train for internal combustion engine
DE4117406A1 (en) * 1991-05-28 1992-12-03 Freudenberg Carl Fa VALVE DRIVE IN THE CYLINDER HEAD OF AN INTERNAL COMBUSTION ENGINE
JP3331526B2 (en) * 1993-11-25 2002-10-07 フジオーゼックス株式会社 Poppet valve drive
FR2776950B1 (en) 1998-04-06 2000-05-19 Belin Yvon Sa ROTARY CUTTING TOOL WITH INTERCHANGEABLE HEAD ASSEMBLED BY TRACTION
DE10116218A1 (en) 2001-03-30 2002-10-10 Bosch Gmbh Robert 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
DE10228702A1 (en) 2001-10-19 2003-04-30 Bosch Gmbh Robert Hydraulic actuator for a gas exchange valve
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

Also Published As

Publication number Publication date
DE50310760D1 (en) 2008-12-18
US20060137639A1 (en) 2006-06-29
JP2006508291A (en) 2006-03-09
US7360517B2 (en) 2008-04-22
JP4221376B2 (en) 2009-02-12
WO2004051058A1 (en) 2004-06-17
DE10256242A1 (en) 2004-06-09
EP1570160A1 (en) 2005-09-07

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