EP1311746A1 - Connection between a stem end on a gas exchange valve in an internal combustion engine and a sleeve-like actuator body of a valve actuator - Google Patents

Connection between a stem end on a gas exchange valve in an internal combustion engine and a sleeve-like actuator body of a valve actuator

Info

Publication number
EP1311746A1
EP1311746A1 EP01955271A EP01955271A EP1311746A1 EP 1311746 A1 EP1311746 A1 EP 1311746A1 EP 01955271 A EP01955271 A EP 01955271A EP 01955271 A EP01955271 A EP 01955271A EP 1311746 A1 EP1311746 A1 EP 1311746A1
Authority
EP
European Patent Office
Prior art keywords
actuator
valve
sleeve
valve actuator
gas exchange
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.)
Withdrawn
Application number
EP01955271A
Other languages
German (de)
French (fr)
Inventor
Georg Mallebrein
Hermann Gaessler
Udo Diehl
Karsten Mischker
Rainer Walter
Bernd Rosenau
Juergen Ulm
Sevan Tatiyosyan
Juergen Schiemann
Christian Grosse
Volker Beuche
Simon Kieser
Andreas Baumann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1311746A1 publication Critical patent/EP1311746A1/en
Withdrawn legal-status Critical Current

Links

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
    • F01L3/20—Shapes or constructions of valve members, not provided for in preceding subgroups of this group
    • 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

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 actuator of a valve actuator, according to the preamble of claim 1.
  • the actuator is formed by a differential piston which within a pressure range to which pressure medium can be applied arranged in an actuator housing is axially movably guided and encloses the shaft end of the gas exchange valve.
  • the pressure range includes an upper and a lower working space within the cylinder, which the differential piston axially spaced and delimits with its two end faces.
  • the differential piston can slide up and down within the cylinder.
  • the shaft end of the gas exchange valve and the differential piston are connected by means of wedge pieces, which are pressed radially against the shaft end by a thrown-on cone clamping sleeve with a complementary wedge angle and are axially supported on the differential piston, as a result of which ring beads formed in ring grooves on the outer circumference on the radially inner peripheral surface of the wedge pieces of the shaft end can engage positively.
  • the connection between the shaft end of the gas exchange valve and the differential piston is located entirely within the hydraulically sealed cylinder in the upper working area, which is delimited at the end by a cylinder base that is integral with the cylinder. The connection is therefore only accessible from the outside if the hydraulically sealed cylinder or the entire cylinder has been opened beforehand
  • connection according to the invention is also outside the area of the valve actuator which is pressurized, the hydraulic circuit does not have to be opened.
  • the good accessibility to the moving end of the valve stem enables, in addition to the optical control of the connection, the simple attachment of sensors, for example stroke sensors, for experimental purposes.
  • the opening is formed at the end remote from the combustion chamber of a through hole extending through the valve studio.
  • the actuator includes an actuator sleeve which is axially movably guided through the through hole of the valve actuator and which extends essentially from a bottom of the valve actuator to the area of the opening and into which a shaft of the gas exchange valve is inserted from the bottom of the valve actuator, which it also carries preferably encloses a small radial distance.
  • connection is preferably formed on an end section of the actuator sleeve remote from the combustion chamber, which protrudes a little way out of the opening of the valve actuator, the shaft end of the gas exchange valve protruding into and held in a coaxial bore formed in the end section of the actuator sleeve remote from the combustion chamber. Because of the arrangement of the connection outside the valve actuator, the connection is even more accessible.
  • annular cover is provided in the area of the opening of the valve actuator for sealing the pressure area from the environment, through which the end section of the actuator sleeve protrudes.
  • the cover is radially interposed between a radially inner circumferential surface of the through bore and a radially outer circumferential surface of the actuator sleeve and carries a radially outer ring seal and a radially inner ring seal.
  • FIG. 1 An embodiment of the invention is shown in the drawings and explained in more detail in the following description.
  • the single figure shows a lateral cross-sectional representation of a preferred embodiment of a connection according to the invention between a shaft end of a gas exchange valve of an internal combustion engine and a sleeve-shaped actuator of a valve actuator. Description of the embodiment
  • FIG. 1 For reasons of scale, only one gas exchange valve 1 of a valve train of an internal combustion engine is shown in FIG. 1, which is actuated by an actuator 2 of a valve actuator 4 such that it performs upward and downward opening and closing movements.
  • the actuator includes an actuator sleeve 6, which extends through a coaxial through bore 8 of the valve actuator 4, which extends between a bottom surface 10 near the cylinder head or near the combustion chamber and an upper surface 12 of the valve actuator 4 remote from the combustion chamber and projects with its free end section 14
  • a stem 18 of the gas exchange valve 1 starting from a valve seat in the combustion chamber of the internal combustion engine, projects through a cylinder head (not shown for scale reasons) into the actuator sleeve 6, with an end 20 of the stem extending into a bore 22 on the end section 14 of the actuator sleeve 6, which is distant from the combustion chamber extends into and is held there.
  • a connection 24 between the actuator sleeve 6 and the shaft end 20 of the gas exchange valve 1 thus takes place on the side of the valve actuator 4 remote from the combustion chamber, in the region of the end opening 16 of the through bore 8 and is preferably offset a little from this opening 16 in the direction pointing away from the combustion chamber arranged.
  • the connection 24 can be designed to be positive and / or non-positive.
  • the actuator 2 also includes a hydraulically actuated differential piston 28 held on the radially outer circumferential surface 26 of the actuator sleeve 6, which is pushed onto the actuator sleeve 6 from above and, for example, by one on the actuator sleeve 6 an annular groove supporting circlip 30 is axially countered against a shoulder 32 of the actuator sleeve 6.
  • the differential piston 28 is axially movably guided in a guide sleeve 34, which is clamped from above against a shoulder 38 of the through bore .8 by an annular cover 36.
  • the differential piston 28, the actuator sleeve 6 and the gas exchange valve 1 therefore form a coupled structural unit which is axially movably guided in the through bore 8 of the valve actuator 4 and more precisely in the guide sleeve 34.
  • the differential piston 28 delimits an upper working space 40 with its upper end surface remote from the combustion chamber and with its lower end surface close to the combustion chamber. a lower working space 42, the two working spaces 40, 42 being sealed off from one another by the differential piston 28 and being able to be filled or relieved of pressure medium, preferably hydraulic fluid, via radially opening pressure medium channels 44, 46.
  • pressure medium preferably hydraulic fluid
  • the upper working space 40 is bounded at the top, towards the surroundings, by the cover 36, which is inserted into the opening 16 of the through bore 8, a radially inner peripheral surface 48 of the through bore 8 and the radially outer peripheral surface 26 of the actuator sleeve 6.
  • the cover 26 is fastened to the Venfilsteller 4 in a manner not shown, preferably screwed on, and has on its radially outer circumferential surface an annular groove extending in the circumferential direction, in which a radially outer ring seal 50 is received, and another on its radially inner circumferential surface , circumferentially extending annular groove in which a radial dial inner ring seal 52 is added.
  • the cover 36 axially abutting on the guide sleeve 34 has radial transverse bores 54 on its underside in order to create a connection between the upper pressure medium channels 44 and the upper working space 40.
  • the lower working space 42 is sealed off from the cylinder head by a lower ring seal 56, which is received in an annular groove formed on the radially inner circumference 48 of the through-bore 8 and seals against the radially outer circumferential surface 26 of the actuator sleeve.
  • the upper, radially inner ring seal 52 carried by the cover 36 and the lower ring seal 56 are designed as movement seals, for example as lip seals, because of the axial movements of the adjusting sleeve 6 relative to the through bore 8 and the cover 36, while the upper, radially outer ring seal 50 is only static is loaded and is formed, for example, by an O-ring.
  • the connection 24 between the shaft end 20 of the gas exchange valve 1 and the actuator sleeve 6 is thus outside this hydraulically sealed pressure area 58 and preferably a small distance from the opening 16 of the through bore 8 of the valve actuator 4.
  • the connection 24 could also in the opening 16 of the through hole 8 or from. this can be arranged a bit offset towards the combustion chamber, in which case on the one hand Diameter of the opening 16 must be large enough so that the connection 24 is still accessible from the outside.
  • the upper cover 36 must then be moved towards the combustion chamber so that the connection 24 is still outside the hydraulic pressure range 58.
  • the stem 18 of the gas exchange valve 1 always projects from below, i.e. from the cylinder head into the actuator sleeve 6.
  • the valve actuator 4 is placed on the cylinder head and at the same time the
  • the function of the valve actuator 4 is then as follows:
  • the lower working space 42 is constantly pressurized via the lower pressure medium channel 46.
  • the differential piston 28 together with the actuator sleeve 6 is pushed upwards, whereupon the gas exchange valve 1 connected to the actuator sleeve 6 is brought into the closed position.
  • the upper working space 40 is pressurized in a manner not shown in more detail by means of two control valves, preferably two solenoid valves. strikes, the differential piston 28 moves downward in the direction of the combustion chamber due to the larger hydraulic effective area in the upper working chamber 40 compared to the lower working chamber 42, as a result of which the gas exchange valve 1 is brought into the open position.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Valve Device For Special Equipments (AREA)
  • Lift Valve (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Abstract

The invention relates to a connection (24) between a stem end (20) on a gas exchange valve (1) in an internal combustion engine and a sleeve-like actuator body (2) of a valve actuator (4), which may be axially displaced within a pressure region (58) pressurised with a pressure agent in the valve actuator (4) and which at least partially encloses the stem end (20). According to the invention, the connection is formed outside the pressure region (58) and arranged in the region of an opening (16) which is preferably coaxial with the stem end (20) and formed on the side of the valve actuator (4) away from the combustion chamber.

Description

Verbindung zwischen einem Schaftende eines Gaswechselventils einer Brenn raftrmaschine und einem hüisenförmigen Stellglied eines VentilstellersConnection between a shaft end of a gas exchange valve of an internal combustion engine and a sleeve-shaped actuator of a valve actuator
Beschreibungdescription
Stand der TechnikState of the art
Die Erfindung geht aus von einer Verbindung zwischen einem Schaftende eines Gaswechselventils einer Brennkraftmaschine und ei- nem hülsenförmigen Stellglied 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 actuator of a valve actuator, according to the preamble of claim 1.
Eine solche Verbindung ist aus der WO 99/66177 bekannt, bei welcher das Stelllglied durch einen Differentialkolben gebildet ist, der innerhalb eines mit Druckmittel beaufschlagbaren Druckbereichs eines in einem Stellergehäuse angeordneten Zylinders axial beweglich geführt ist und das Schaftende des Gaswechselventils umschließt. Der Druckbereich beinhaltet einen oberen und einen unteren Arbeitsraum innerhalb des Zylinders, die der Differentialkolben axial beabstandet und mit seinen beiden Stirnflächen begrenzt. Je nach Druckbeaufschlagung der beiden Arbeitsräume kann der Differentialkolben innerhalb des Zylinders auf und ab gleiten. Die Verbindung des Schaftendes des Gaswechselventils und dem Differentialkolben erfolgt mittels Keilstücken, welche durch eine übergeworfene Konusspannhüise mit kom- plementärem Keilwinkel gegen das Schaftende radial gedrückt sind und sich am Differentialkolben axial abstützen, wodurch an der radial inneren Umfangsfläche der Keilstücke ausgebildete Ringwülste in Ringnuten am Außenumfang des Schaftendes formschlüssig eingreifen können. Die Verbindung zwischen dem Schaftende des Gaswechselventils und dem Differentialkolben befindet sich vollständig innerhalb des hydraulisch abgedichteten Zylinders im oberen Arbeitsraum, der end- seitig durch einen mit dem Zylinder einstückigen Zylinderboden begrenzt ist. Die Verbindung ist daher von außen erst dann zugängig, wenn zuvor der hydraulisch abgedichtete Zylinder bzw. das gesamteSuch a connection is known from WO 99/66177, in which the actuator is formed by a differential piston which within a pressure range to which pressure medium can be applied arranged in an actuator housing is axially movably guided and encloses the shaft end of the gas exchange valve. The pressure range includes an upper and a lower working space within the cylinder, which the differential piston axially spaced and delimits with its two end faces. Depending on the pressurization of the two working spaces, the differential piston can slide up and down within the cylinder. The shaft end of the gas exchange valve and the differential piston are connected by means of wedge pieces, which are pressed radially against the shaft end by a thrown-on cone clamping sleeve with a complementary wedge angle and are axially supported on the differential piston, as a result of which ring beads formed in ring grooves on the outer circumference on the radially inner peripheral surface of the wedge pieces of the shaft end can engage positively. The connection between the shaft end of the gas exchange valve and the differential piston is located entirely within the hydraulically sealed cylinder in the upper working area, which is delimited at the end by a cylinder base that is integral with the cylinder. The connection is therefore only accessible from the outside if the hydraulically sealed cylinder or the entire cylinder has been opened beforehand
Stellergehäuse entfernt wird, im Laufe einer von Zeit zu Zeit erfolgen- , den Montage bzw. Demontage der Verbindung beispielsweise zu Reparaturzwecken muß demzufolge der Hydraulikkreis geöffnet werden und es besteht die Gefahr, daß Schmutz und Luft in das Hydrauliksy- stem eindringt. Darüber hinaus können bei gegenüber dem Differentialkolben verkantetem Einbau des Steliergehäuses Dichtungen beschädigt werden. Vorteile der ErfindungIf the actuator housing is removed, which takes place from time to time, the assembly or disassembly of the connection, for example for repair purposes, must therefore open the hydraulic circuit and there is a risk of dirt and air entering the hydraulic system. In addition, seals can be damaged if the studio housing is tilted in relation to the differential piston. Advantages of the invention
Die erfindungsgemäße Verbindung zwischen einem Schaftende eines Gaswechselventils einer Brennkraftmaschine und einem hülsenförmigen Stellglied eines Ventilstellers hat demgegenüber den Vorteil, daß sie wegen ihrer Lage im Bereich der Öffnung des Ventilstellers zuThe connection according to the invention between a shaft end of a gas exchange valve of an internal combustion engine and a sleeve-shaped actuator of a valve actuator has the advantage that it is due to its position in the region of the opening of the valve actuator
Montage bzw. Demontagezwecken leicht zugängig ist, ohne daß der Ventilsteller vom Zyiinderkopf entfernt werden muß. Da sich die erfindungsgemäße Verbindung zudem außerhalb des mit Druckmittel beaufschlagten Bereichs des Ventilstellers befindet, muß der Hydraulik- kreis nicht geöffnet werden. Die gute Zugängigkeit zum bewegten Ende des Ventilschaftes ermöglicht neben der optischen Kontrolle der Verbindung auch das einfache Anbringen von Sensoren, beispielsweise von Hubsensoren, zu Experimentalzwecken.Assembly or disassembly is easily accessible without having to remove the valve actuator from the cylinder head. Since the connection according to the invention is also outside the area of the valve actuator which is pressurized, the hydraulic circuit does not have to be opened. The good accessibility to the moving end of the valve stem enables, in addition to the optical control of the connection, the simple attachment of sensors, for example stroke sensors, for experimental purposes.
Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen der irn Patentanspruch 1 angegebenen Erfindung möglich.Advantageous further developments and improvements of the invention specified in patent claim 1 are possible through the measures listed in the subclaims.
Gemäß einer besonders zu bevorzugenden Maßnahme ist die Öffnung am brennraumfernen Ende einer sich durch den Ventilstelier hindurch erstreckenden Durchgangsbohrung ausgebildet. Das Stell- glied beinhaltet eine durch die Durchgangsbohrung des Ventilstellers axial beweglich geführte Stellerhülse, die sich im wesentlichen von einem Boden des Ventilstellers bis in den Bereich der Öffnung erstreckt und in welche ein Schaft des Gaswechselventils vom Boden des Ventilstellers her eingeführt ist, den sie mit vorzugsweise geringem Radial- abstand umschließt. Infolgedessen können bei der Montage d er Brennkraftmaschine der Ventilsteller auf den Zylinderkopf aufgesetzt und gleichzeitig die Schäfte der Gaswechselventile in die entsprechenden Duchgangsbohrungen im Ventilsteller eingeführt werden. Da die Verbindungen zwischen den Gaswechselventilen und den Stellerhülsen im Bereich der Öffnungen angeordnet und deshalb gut zugängig sind, kann deren Montage anschließend auf einfache Weise von oben erfol- gen.According to a particularly preferred measure, the opening is formed at the end remote from the combustion chamber of a through hole extending through the valve studio. The actuator includes an actuator sleeve which is axially movably guided through the through hole of the valve actuator and which extends essentially from a bottom of the valve actuator to the area of the opening and into which a shaft of the gas exchange valve is inserted from the bottom of the valve actuator, which it also carries preferably encloses a small radial distance. As a result, when assembling the internal combustion engine, the valve actuator can be placed on the cylinder head and at the same time the stems of the gas exchange valves can be inserted into the corresponding ones Through holes are introduced in the valve actuator. Since the connections between the gas exchange valves and the actuator sleeves are arranged in the area of the openings and are therefore easily accessible, they can then be installed in a simple manner from above.
In bevorzugter Weise ist die Verbindung an einem brennraumfernen Endabschnitt der Stellerhülse ausgebildet, der ein Stück weit aus der Öffnung des Ventilstellers herausragt, wobei das Schaftende des Gaswechselventils in eine koaxiale, im brennraumfernen Endab- schnitt der Stellerhülse ausgebildete Bohrung hineinragt und dort gehalten ist. Wegen der Anordnung der Verbindung außerhalb des Ventilstellers ist die Verbindung noch besser zugängig.The connection is preferably formed on an end section of the actuator sleeve remote from the combustion chamber, which protrudes a little way out of the opening of the valve actuator, the shaft end of the gas exchange valve protruding into and held in a coaxial bore formed in the end section of the actuator sleeve remote from the combustion chamber. Because of the arrangement of the connection outside the valve actuator, the connection is even more accessible.
Gemäß einer Weiterbildung ist im Bereich der Öffnung des Ventilstellers ein ringförmiger Deckel zur Abdichtung des Druckbereichs gegenüber der Umgebung vorgesehen, durch welchen der Endabschnitt der Stellerhülse ragt. Der Deckel ist einer radial inneren Um- fangsfläche der Durchgangsbohrung und einer radial äußeren Um- fangsfläche der Stellerhülse radial zwischengeordnet und trägt eine radial äußere Ringdichtung sowie eine radial innere Ringdichtung.According to a development, an annular cover is provided in the area of the opening of the valve actuator for sealing the pressure area from the environment, through which the end section of the actuator sleeve protrudes. The cover is radially interposed between a radially inner circumferential surface of the through bore and a radially outer circumferential surface of the actuator sleeve and carries a radially outer ring seal and a radially inner ring seal.
Zeichnungendrawings
Ein Ausführungsbeispiel der Erfindung ist in den Zeichnungen dargestellt und in der nachfolgenden Beschreibung näher erläutert. Die einzige Figur zeigt eine seitliche Querschnittsdarstellung einer bevor- zugten Ausführungsform einer erfindungsgemäßen Verbindung zwischen einem Schaftende eines Gaswechselventils einer Brennkraftmaschine und einem hülsenförmigen Stellglied eines Ventilstellers. Beschreibung des AusführungsbeispielsAn embodiment of the invention is shown in the drawings and explained in more detail in the following description. The single figure shows a lateral cross-sectional representation of a preferred embodiment of a connection according to the invention between a shaft end of a gas exchange valve of an internal combustion engine and a sleeve-shaped actuator of a valve actuator. Description of the embodiment
Von einem Ventiltrieb einer Brennkraftmaschine ist in Fig.1 aus Maßstabsgründen nur ein Gaswechselventil 1 gezeigt, welches durch ein Stellglied 2 eines Ventilstellers 4 derart betätigt wird, daß es auf- und abwärtsgehende Öffnungs- und Schließbewegungen ausführt.For reasons of scale, only one gas exchange valve 1 of a valve train of an internal combustion engine is shown in FIG. 1, which is actuated by an actuator 2 of a valve actuator 4 such that it performs upward and downward opening and closing movements.
Das Stellglied beinhaltet eine Stellerhülse 6, welche sich durch eine koaxiale Durchgangsbohrung 8 des Ventilstellers 4 hindurch erstreckt, die zwischen einer zylinderkopfnahen oder brennraumnahen Bodenfläche 10 und einer brennraumfernen, oberen Fläche 12 des Ventilstellers 4 verläuft und ragt mit ihrem freien Endabschnitt 14 einThe actuator includes an actuator sleeve 6, which extends through a coaxial through bore 8 of the valve actuator 4, which extends between a bottom surface 10 near the cylinder head or near the combustion chamber and an upper surface 12 of the valve actuator 4 remote from the combustion chamber and projects with its free end section 14
Stück weit aus einer brennraumfernen Öffnung 16 der Durchgangsbohrung 8 heraus. Ein Schaft 18 des Gaswechselventils 1 ragt ausgehend von einem Ventilsitz im Brennraum der Brennkraftmaschine durch einen aus Maßstabsgründen nicht dargestellten Zylinderkopf in die Stel- lerhülse 6 hinein, wobei sich ein Schaftende 20 bis in eine mit diesem koaxiale Bohrung 22 am brennraumfernen Endabschnitt 14 der Stellerhülse 6 hinein erstreckt und dort gehalten ist. Eine Verbindung 24 zwischen der Stellerhülse 6 und dem Schaftende 20 des Gaswechselventils 1 erfolgt somit an der brennraumfernen Seite des Ventilstellers 4, im Bereich der endseitigen Öffnung 16 der Durchgangsbohrung 8 und ist vorzugsweise in vom Brennraum weg weisender Richtung ein Stück weit von dieser Öffnung 16 versetzt angeordnet. Die Verbindung 24 kann formschlüssig und/oder kraftschlüssig ausgebildet sein.Partly out of an opening 16 of the through bore 8 remote from the combustion chamber. A stem 18 of the gas exchange valve 1, starting from a valve seat in the combustion chamber of the internal combustion engine, projects through a cylinder head (not shown for scale reasons) into the actuator sleeve 6, with an end 20 of the stem extending into a bore 22 on the end section 14 of the actuator sleeve 6, which is distant from the combustion chamber extends into and is held there. A connection 24 between the actuator sleeve 6 and the shaft end 20 of the gas exchange valve 1 thus takes place on the side of the valve actuator 4 remote from the combustion chamber, in the region of the end opening 16 of the through bore 8 and is preferably offset a little from this opening 16 in the direction pointing away from the combustion chamber arranged. The connection 24 can be designed to be positive and / or non-positive.
Das Stellglied 2 umfaßt außerdem einen hydraulisch betätigba- ren, an der radial äußeren Umfangsfläche 26 der Stellerhülse 6 gehaltenen Differentialkolben 28, der von oben auf die Stellerhülse 6 aufgeschoben und beispielsweise durch einen sich an der Stellerhülse 6 in einer Ringnut abstützenden Sicherungsring 30 gegen einen Absatz 32 der Stellerhülse 6 axial gekontert ist. Der Differentialkolben 28 ist in einer Führungshülse 34 axial beweglich geführt, die durch einen ringförmigen Deckel 36 von oben her gegen einen Absatz 38 der Durch- gangsbohrung .8 verspannt ist. Der Differentialkolben 28, die Stellerhülse 6 und das Gaswechselventil 1 bilden daher eine gekoppelte Baueinheit, welche in der Durchgangsbohrung 8 des Ventilstellers 4 und genauer in der Führungshülse 34 axial beweglich geführt ist.The actuator 2 also includes a hydraulically actuated differential piston 28 held on the radially outer circumferential surface 26 of the actuator sleeve 6, which is pushed onto the actuator sleeve 6 from above and, for example, by one on the actuator sleeve 6 an annular groove supporting circlip 30 is axially countered against a shoulder 32 of the actuator sleeve 6. The differential piston 28 is axially movably guided in a guide sleeve 34, which is clamped from above against a shoulder 38 of the through bore .8 by an annular cover 36. The differential piston 28, the actuator sleeve 6 and the gas exchange valve 1 therefore form a coupled structural unit which is axially movably guided in the through bore 8 of the valve actuator 4 and more precisely in the guide sleeve 34.
Der Differentialkolben 28 begrenzt mit seiner oberen, brenn- raumfernen Stirnfläche einen oberen Arbeitsraum 40 und mit seiner unteren, brennraumnahen Stirnfläche . einen unteren Arbeitsraum 42, wobei die beiden Arbeitsräume 40, 42 durch den Differentialkolben 28 gegeneinander abgedichtet und über radial einmündende Druckmittelkanäle 44, 46 mit einem Druckmittel, vorzugsweise Hydraulikflüssig- keit befüllbar oder entlastbar sind. Hierzu sind die Druckmittel kanäleThe differential piston 28 delimits an upper working space 40 with its upper end surface remote from the combustion chamber and with its lower end surface close to the combustion chamber. a lower working space 42, the two working spaces 40, 42 being sealed off from one another by the differential piston 28 and being able to be filled or relieved of pressure medium, preferably hydraulic fluid, via radially opening pressure medium channels 44, 46. For this purpose, the pressure medium channels
44, 46 in nicht näher gezeigter Weise mittels je eines Steuerventils, vorzugsweise eines Magnetventils in' Abhängigkeit der Steuersignale ' eines elektrischen Steuergeräts auf- beziehungsweise zusteuerbar.44, 46 in manner not shown by means of one control valve, a solenoid valve, preferably in 'a function of the control signals' of an electrical control device up or zusteuerbar.
Der obere Arbeitsraum 40 ist nach oben, zur Umgebung hin durch den in die Öffnung 16 der Durchgangsbohrung 8 eingesetzten, einer radial inneren Umfangsfläche 48 der Durchgangsbohrung 8 und der radial äußeren Umfangsfläche 26 der Stellerhülse 6 zwischengeordneten Deckel 36 begrenzt. Der Deckel 26 ist am Venfilsteller 4 in nicht dargestellter Weise befestigt, vorzugsweise festgeschraubt, und hat an seiner radial äußeren Umfangsfläche eine sich in Umfangsrich- tung erstreckende Ringnut, in welcher eine radial äußere Ringdichtung 50 aufgenommen ist, und an seiner radial inneren Umfangsfläche eine weitere, sich in Umfangsrichtung erstreckende Ringnut, in der eine ra- dial innere Ringdichtung 52 aufgenommen ist. Darüber hinaus weist der von oben an der Führungshülse 34 axial anschlagende Deckel 36 an seiner Unterseite radiale Querbohrungen 54 auf, um eine Verbindung zwischen den oberen Druckmitttelkanälen 44 und dem oberen Arbeits- räum 40 zu schaffen.The upper working space 40 is bounded at the top, towards the surroundings, by the cover 36, which is inserted into the opening 16 of the through bore 8, a radially inner peripheral surface 48 of the through bore 8 and the radially outer peripheral surface 26 of the actuator sleeve 6. The cover 26 is fastened to the Venfilsteller 4 in a manner not shown, preferably screwed on, and has on its radially outer circumferential surface an annular groove extending in the circumferential direction, in which a radially outer ring seal 50 is received, and another on its radially inner circumferential surface , circumferentially extending annular groove in which a radial dial inner ring seal 52 is added. In addition, the cover 36 axially abutting on the guide sleeve 34 has radial transverse bores 54 on its underside in order to create a connection between the upper pressure medium channels 44 and the upper working space 40.
Der untere Arbeitsraum 42 ist zum Zylinderkopf hin durch eine untere Ringdichtung 56 abgedichtet, welche in einer am radial inneren Umfang 48 der Durchgangsbohrung 8 ausgebildeten Ringnut aufgenommen ist und gegen die radial äußere Umfangsfläche 26 der Steller- hülse dichtet. Die vom Deckel 36 getragene obere, radial innere Ringdichtung 52 und die untere Ringdichtung 56 sind wegen der axialen Bewegungen der Stellerhülse 6 relativ zur Durchgangsbohrung 8 und zum Deckel 36 als Bewegungsdichtungen, beispielsweise als Lippendichtungen ausgebildet, während die obere, radial äußere Ringdichtung 50 nur statisch belastet ist und beispielsweise durch einen O-Ring gebildet wird.The lower working space 42 is sealed off from the cylinder head by a lower ring seal 56, which is received in an annular groove formed on the radially inner circumference 48 of the through-bore 8 and seals against the radially outer circumferential surface 26 of the actuator sleeve. The upper, radially inner ring seal 52 carried by the cover 36 and the lower ring seal 56 are designed as movement seals, for example as lip seals, because of the axial movements of the adjusting sleeve 6 relative to the through bore 8 and the cover 36, while the upper, radially outer ring seal 50 is only static is loaded and is formed, for example, by an O-ring.
Ein innerhalb der Durchgangsbohrung 8, zwischen denn oberen, brennraumfernen Deckel 36 und der unteren, brennraumnahen Ringdichtung 56 angeordneter Bereich, welcher auch den oberen und unte- ren Arbeitsraum 40, 42 umfaßt, bildet einen hydraulischen Druckbereich 58, der im Betrieb mit Druckmittel beaufschlagbar ist. Die Verbindung 24 zwischen dem Schaftende 20 des Gaswechselventils 1 und der Stellerhülse 6 befindet sich somit außerhalb dieses hydraulisch abgedichteten Druckbereichs 58 und vorzugsweise ein kleines Stück weit von der Öffnung 16 der Durchgangsbohrung 8 des Ventilstellers 4 entfernt. Alternativ könnte die Verbindung 24 auch in der Öffnung 16 der Durchgangsbohrung 8 oder von. dieser ein Stück weit zum Brennraum hin versetzt angeordnet sein, wobei in diesem Fall zum einen der Durchmesser der Öffnung 16 groß genug sein muß, damit die Verbindung 24 weiterhin von außen zugängig ist. Zum andern muß dann der obere Deckel 36 zum Brennraum hin versetzt werden, damit sich die Verbindung 24 weiterhin außerhalb des hydraulischen Druckbereichs 58 befindet.A region arranged within the through-bore 8, between the upper cover 36 remote from the combustion chamber and the lower ring seal 56 near the combustion chamber, which also includes the upper and lower working chambers 40, 42, forms a hydraulic pressure region 58 which can be pressurized during operation , The connection 24 between the shaft end 20 of the gas exchange valve 1 and the actuator sleeve 6 is thus outside this hydraulically sealed pressure area 58 and preferably a small distance from the opening 16 of the through bore 8 of the valve actuator 4. Alternatively, the connection 24 could also in the opening 16 of the through hole 8 or from. this can be arranged a bit offset towards the combustion chamber, in which case on the one hand Diameter of the opening 16 must be large enough so that the connection 24 is still accessible from the outside. On the other hand, the upper cover 36 must then be moved towards the combustion chamber so that the connection 24 is still outside the hydraulic pressure range 58.
Unabhängig von der Höhenlage der Verbindung 24 in Bezug zur Öffnung 16 des Ventilstellers 4 ragt der Schaft 18 des Gaswechselventils 1 stets von unten, d.h. vom Zylinderkopf her in die Stellerhülse 6 hinein. Infolgedessen wird bei der Montage der Brennkraftmaschine der Ventilsteller 4 auf den Zylinderkopf aufgesetzt und gleichzeitig dieRegardless of the height of the connection 24 in relation to the opening 16 of the valve actuator 4, the stem 18 of the gas exchange valve 1 always projects from below, i.e. from the cylinder head into the actuator sleeve 6. As a result, the valve actuator 4 is placed on the cylinder head and at the same time the
Schäfte 18 der Gaswechselventile 1 in die in den Durchgangsbohrungen 8 gehaltenen Stellerhülsen 6 eingeführt. Da gemäß der bevorzugten Ausführungsform die lichte Höhe des Ventilstellers 4 gerade so groß ist, daß die Schaftenden 20 der sich in Schließstellung befinden- den Gaswechselventile 1 ein Stück weit aus den Öffnungen 16 derShafts 18 of the gas exchange valves 1 are inserted into the actuator sleeves 6 held in the through bores 8. Since, according to the preferred embodiment, the clear height of the valve actuator 4 is just large enough that the shaft ends 20 of the gas exchange valves 1 which are in the closed position are a little way out of the openings 16 in FIG
Durchgangsbohrungen 8 heraus ragen, können die Verbindungen 24 zwischen diesen und den zugeordneten Endabschnitten 14 der ebenfalls aus den Öffnungen 16 heraus ragenden Stellerhülsen 6 bei bereits auf den Zylinderkopf aufgesetztem Ventilsteller 4 und von oben leicht zugängig montiert bzw. demontiert werden.If through holes 8 protrude out, the connections 24 between these and the associated end sections 14 of the actuator sleeves 6, which also protrude from the openings 16 when the valve actuator 4 has already been placed on the cylinder head and can be easily accessed or removed from above.
Die Funktionsweise des Ventilstellers 4 ist dann wie folgt : Der untere Arbeitsraum 42 ist über den unteren Druckmittelkanal 46 ständig mit Druckmittel beaufschlagt. Bei Druckentlastung des oberen Arbeitsraumes 40 wird der Differentialkolben 28 zusammen mit der Stellerhül- se 6 nach oben gedrängt, woraufhin das mit der Stellerhülse 6 verbundene Gaswechselventil 1 in Schließstellung gebracht wird. Wird hingegen der obere Arbeitsraum 40 in nicht näher gezeigter Weise mittels zweier Steuerventile, vorzugsweise zweier Magnetventile druckbeauf- schlagt, so bewegt sich der Differentialkolben 28 aufgrund der im oberen Arbeitsraum 40 im Vergleich zum unteren Arbeitsraum 42 größeren hydraulischen Wirkfläche nach unten, in Richtung auf den Brennraum zu, wodurch das Gaswechselventil 1 in Öffnungsstellung gebracht wird. The function of the valve actuator 4 is then as follows: The lower working space 42 is constantly pressurized via the lower pressure medium channel 46. When the upper working chamber 40 is relieved of pressure, the differential piston 28 together with the actuator sleeve 6 is pushed upwards, whereupon the gas exchange valve 1 connected to the actuator sleeve 6 is brought into the closed position. If, on the other hand, the upper working space 40 is pressurized in a manner not shown in more detail by means of two control valves, preferably two solenoid valves. strikes, the differential piston 28 moves downward in the direction of the combustion chamber due to the larger hydraulic effective area in the upper working chamber 40 compared to the lower working chamber 42, as a result of which the gas exchange valve 1 is brought into the open position.

Claims

Patentansprüche claims
1 . Verbindung (24) zwischen einem Schaftende (20) eines Gaswechselventils (1 ) einer Brennkraftmaschine und einem hülsenförmigen Stellglied (2) eines Ventilstellers (4), das innerhalb eines mit Druckmittel beaufschlagbaren Druckbereichs (58) des Ventilstellers (4) axial beweglich geführt ist und welches das Schaftende (20) wenigstens teilweise umschließt, dadurch gekennzeichnet, daß sie außerhalb des Druckbereichs (58) und im Bereich einer an der brennraumfernen Seite des Ventilstellers (4) ausgebildeten, vorzugsweise mit dem Schaftende (20) koaxialen Öffnung (16) angeordnet ist.1 . Connection (24) between a shaft end (20) of a gas exchange valve (1) of an internal combustion engine and a sleeve-shaped actuator (2) of a valve actuator (4), which is axially movably guided within a pressure area (58) of the valve actuator (4) which can be pressurized and which at least partially surrounds the shaft end (20), characterized in that it is arranged outside the pressure region (58) and in the region of an opening (16) which is formed on the side of the valve actuator (4) remote from the combustion chamber and is preferably coaxial with the shaft end (20) ,
2. Verbindung nach Anspruch 1 , dadurch gekennzeichnet, daß die Öffnung (16) am brennraumfernen Ende einer sich durch den Ventilsteller (4) hindurch erstreckenden Durchgangsbohrung (8) ausgebildet ist.2. Connection according to claim 1, characterized in that the opening (16) is formed at the end remote from the combustion chamber of a through hole (8) extending through the valve actuator (4).
3. Verbindung nach Anspruch 2, dadurch gekennzeichnet, daß das Stellglied (2) eine durch die Durchgangsbohrung (8) des Ventilstellers (4) axial beweglich geführte Stellerhülse (6) beinhaltet, die sich im wesentlichen von einem Boden (10) des Ventilstellers (4) bis in den Be- reich der Öffnung (16) erstreckt und in welche ein Schaft (18) des3. Connection according to claim 2, characterized in that the actuator (2) includes a through the through bore (8) of the valve actuator (4) axially movably guided actuator sleeve (6) which is substantially from a bottom (10) of the valve actuator ( 4) extends into the area of the opening (16) and into which a shaft (18) of the
Gaswechselventils (1 ) vom Boden (10) des Ventilstellers (4) her eingeführt ist, den sie mit vorzugsweise geringem Radialabstand umschließt. Gas exchange valve (1) is introduced from the bottom (10) of the valve actuator (4), which it encloses with a preferably small radial distance.
4. Verbindung nach Anspruch 3, dadurch gekennzeichnet, daß sie an einem brennraumfernen Endabschnitt (14) der Stellerhülse (6) ausgebildet ist, der ein Stück weit aus der Öffnung (16) des Ventilstellers (4) herausragt, wobei das Schaftende (20) des Gaswechselventils (1) in eine koaxiale, im brennraumfernen Endabschnitt (14) der Stellerhülse (6) ausgebildete Bohrung (22) hineinragt und dort gehalten ist.4. Connection according to claim 3, characterized in that it is formed on an end portion (14) of the actuator sleeve (6) remote from the combustion chamber, which protrudes a bit from the opening (16) of the valve actuator (4), the shaft end (20) of the gas exchange valve (1) projects into a coaxial bore (22) formed in the end section (14) of the actuator sleeve (6) remote from the combustion chamber and is held there.
5. Verbindung nach Anspruch 4, dadurch gekennzeichnet, daß im Be- reich der Öffnung (16) des Ventilstellers (4) ein ringförmiger Deckel (36) zur Abdichtung des Druckbereichs (58) gegenüber der Umgebung vorgesehen ist, durch welchen der Endabschnitt (14) der Stelierhülse (6) ragt.5. Connection according to claim 4, characterized in that in the area of the opening (16) of the valve actuator (4) an annular cover (36) for sealing the pressure area (58) from the environment is provided, through which the end portion (14th ) of the studio sleeve (6) protrudes.
6. Verbindung nach Anspruch 5, dadurch gekennzeichnet, daß der Dek- kel (36) einer radial inneren Umfangsfläche (48) der Durchgangsbohrung (8) und einer radial äußeren Umfangsfläche (26) der Stellerhülse (6) radial zwischengeordnet ist und eine radial äußere Ringdichtung (50) sowie eine radial innere Ringdichtung (52) trägt.6. Connection according to claim 5, characterized in that the cover (36) a radially inner circumferential surface (48) of the through hole (8) and a radially outer circumferential surface (26) of the actuator sleeve (6) is arranged radially and a radially outer Ring seal (50) and a radially inner ring seal (52) carries.
7. Verbindung nach Anspruch 6, dadurch gekennzeichnet, daß das Stellglied (2) im weiteren einen Differentialkolben (28) umfaßt, der an der radial äußeren Umfangsfläche (26) der Stellerhülse (6) gehalten und in einer in der Durchgangsbohrung (8) des Ventilstellers (4) befe- stigten Führungshülse (34) axial beweglich geführt ist.7. A compound according to claim 6, characterized in that the actuator (2) further comprises a differential piston (28) which is held on the radially outer peripheral surface (26) of the actuator sleeve (6) and in one in the through bore (8) of the Valve actuator (4) attached guide sleeve (34) is axially movable.
8. Verbindung nach Anspruch 7, dadurch gekennzeichnet, daß der Differentialkolben (28) mit seiner brennraumfernen Stirnfläche einen obe- ren Arbeitsraum (40) und mit seiner brennraumnahen Stirnfläche einen unteren Arbeitstraum (42) begrenzt, die jeweils über im Ventilsteller (4) ausgebildete Druckmittelkanäle (44, 46) mit einem Druckmittel befüllbar oder entlastbar sind.8. A compound according to claim 7, characterized in that the differential piston (28) with its end surface remote from the combustion chamber has an upper Ren work space (40) and with its end face near the combustion chamber delimits a lower work space (42), each of which can be filled or relieved with a pressure medium via pressure medium channels (44, 46) formed in the valve actuator (4).
9. Verbindung nach Anspruch 8, dadurch gekennzeichnet, daß bei Druckbeaufschlagung des unteren Arbeitsraumes (42) und gleichzeitiger Druckentlastung des oberen Arbeitsraumes (40) der Differentialkolben (28) in Schließrichtung des Gaswechselventils (1 ) und bei Druck- beaufschlagung des oberen Arbeitsraumes (40) der Differentialkolben9. A compound according to claim 8, characterized in that when the lower working chamber (42) is pressurized and the upper working chamber (40) is simultaneously depressurized, the differential piston (28) in the closing direction of the gas exchange valve (1) and when the upper working chamber (40) is pressurized ) the differential piston
(28) in Öffnungsrichtung des Gaswechselventils (1 ) gedrängt wird. (28) is pushed in the opening direction of the gas exchange valve (1).
EP01955271A 2000-08-17 2001-07-20 Connection between a stem end on a gas exchange valve in an internal combustion engine and a sleeve-like actuator body of a valve actuator Withdrawn EP1311746A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10040115A DE10040115A1 (en) 2000-08-17 2000-08-17 Connection between a shaft end of a gas exchange valve of an internal combustion engine and a sleeve-shaped actuator of a valve actuator
DE10040115 2000-08-17
PCT/DE2001/002763 WO2002014656A1 (en) 2000-08-17 2001-07-20 Connection between a stem end on a gas exchange valve in an internal combustion engine and a sleeve-like actuator body of a valve actuator

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EP1311746A1 true EP1311746A1 (en) 2003-05-21

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EP01955271A Withdrawn EP1311746A1 (en) 2000-08-17 2001-07-20 Connection between a stem end on a gas exchange valve in an internal combustion engine and a sleeve-like actuator body of a valve actuator

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US (1) US6935286B2 (en)
EP (1) EP1311746A1 (en)
JP (1) JP2004506829A (en)
CN (1) CN1246572C (en)
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WO (1) WO2002014656A1 (en)

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* Cited by examiner, † Cited by third party
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DE10210158A1 (en) 2002-03-07 2003-09-18 Bosch Gmbh Robert Cylinder piston engine
DE102008027650A1 (en) * 2008-06-10 2009-12-17 Man Diesel Se Valve control for a gas exchange valve in an internal combustion engine
CN103615515B (en) * 2013-11-26 2018-05-22 天津明贤科技有限公司 A kind of gear
WO2017041835A1 (en) 2015-09-09 2017-03-16 Volvo Truck Corporation Valve arrangement

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US2595775A (en) * 1946-07-31 1952-05-06 Wrangell Serge De Hydraulic valve operating system
US2444083A (en) 1947-02-10 1948-06-29 Nordberg Manufacturing Co Hydraulic motor means for actuating nested distributing valves
US3209737A (en) * 1962-06-27 1965-10-05 Mitsubishi Shipbuilding & Eng Valve operating device for internal combustion engine
US5029516A (en) 1989-12-26 1991-07-09 North American Philips Corporation Pneumatically powered valve actuator
US5829396A (en) 1996-07-16 1998-11-03 Sturman Industries Hydraulically controlled intake/exhaust valve
US5682846A (en) * 1996-12-19 1997-11-04 Eaton Corporation Engine valve actuator with differential area pistons
DE19826046A1 (en) * 1998-06-12 1999-12-16 Bosch Gmbh Robert Valve control device for an internal combustion engine

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* Cited by examiner, † Cited by third party
Title
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US20030145811A1 (en) 2003-08-07
WO2002014656A1 (en) 2002-02-21
CN1388853A (en) 2003-01-01
JP2004506829A (en) 2004-03-04
CN1246572C (en) 2006-03-22
WO2002014656A8 (en) 2002-09-19
US6935286B2 (en) 2005-08-30
DE10040115A1 (en) 2002-02-28

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