EP0555521A1 - Hydraulic valve tappet - Google Patents

Hydraulic valve tappet Download PDF

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Publication number
EP0555521A1
EP0555521A1 EP92114351A EP92114351A EP0555521A1 EP 0555521 A1 EP0555521 A1 EP 0555521A1 EP 92114351 A EP92114351 A EP 92114351A EP 92114351 A EP92114351 A EP 92114351A EP 0555521 A1 EP0555521 A1 EP 0555521A1
Authority
EP
European Patent Office
Prior art keywords
tappet
compensation element
element according
clearance compensation
valve clearance
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.)
Granted
Application number
EP92114351A
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German (de)
French (fr)
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EP0555521B1 (en
Inventor
Klaus Döhring
Wolfgang Krause
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Carl Freudenberg KG
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Carl Freudenberg KG
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Publication date
Application filed by Carl Freudenberg KG filed Critical Carl Freudenberg KG
Publication of EP0555521A1 publication Critical patent/EP0555521A1/en
Application granted granted Critical
Publication of EP0555521B1 publication Critical patent/EP0555521B1/en
Anticipated expiration legal-status Critical
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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
    • F01L1/20—Adjusting or compensating clearance
    • F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
    • F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
    • F01L1/245—Hydraulic tappets
    • F01L1/25—Hydraulic tappets between cam and valve stem
    • 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
    • Y10T74/2101—Cams
    • Y10T74/2107—Follower

Definitions

  • the invention relates to a hydraulic valve lash adjuster for a valve train of an internal combustion engine, comprising an inner tappet and an outer tappet, which are arranged so as to be movable relative to one another in the axial direction, the outer tappet being formed by a substantially cup-shaped housing with a flat bottom, and wherein the inner and the Outer tappets limit a variable-volume, oil-filled storage space sealed to the outside, in which a displacement element is enclosed to compensate for changes in volume.
  • valve lash adjuster is known from DE-OS 35 06 730.
  • the storage space contained therein is closed to the outside by a bellows-shaped seal.
  • the previously known hydraulic valve lash adjuster has a manufacturability that is unsatisfactory in terms of production technology.
  • the assembly of the individual components that make up the hydraulic valve lash adjuster is complicated and time-consuming.
  • the invention has for its object to show a valve clearance compensation element for a valve train of an internal combustion engine, which is inexpensive to manufacture, in which the assembly sequence is improved and which consists of fewer individual parts.
  • the outer tappet is formed by an essentially tubular jacket made of thermoplastic plastic and at least in some areas radially inside and outside with sliding surfaces, which in the direction of a camshaft used by a as Counter-running disc is sealed liquid-tight and that the inner sliding surface encloses the inner plunger on the circumferential side and liquid-tight.
  • the displacement element can be inserted and mounted in the jacket from above in the tubular jacket which is initially still open in the direction of the camshaft and whose inside sliding surface surrounds the inside tappet in a circumferential and liquid-tight manner. Then the storage space, which is already liquid-tight on the side facing away from the camshaft, is filled with oil from above.
  • the disc which acts as a counter-rotor to the camshaft, is then inserted into the jacket made of thermoplastic material.
  • a vent hole can be provided for venting and for precise adjustment of the resulting internal pressure.
  • B. is sealed liquid-tight with a ball.
  • the disk consists of metallic material and has a surface hardened in the direction of the camshaft.
  • the hardened surface of the disc ensures good usage properties over a long period of use.
  • the disc which is subsequently inserted into the plastic jacket, which forms part of the outer plunger, can, for example, be heated to a temperature before insertion, which allows the thermoplastic material of the jacket to melt on the surface facing the disc and, after cooling, the disc holds reliably in position.
  • Another possibility of fixing the disk in the jacket can be to first insert the disk into the jacket made of thermoplastic material and then to irradiate it in the area of the contact area with ultrasound until a secure connection of the jacket and disk has taken place.
  • the disk can be made of ceramic material.
  • the inner sliding surface of the outer plunger can have a circumferential groove which is open in the direction of the inner plunger and in which a sealing ring is arranged, the sealing ring fitting and sealing the inner plunger during intended use under radial prestress touched.
  • the sealing ring can be formed, for example, by an O-ring. O-rings are easily and inexpensively available in large quantities in a wide variety of dimensions, which is of particular importance with regard to the economic producibility of the valve lash compensation element according to the invention.
  • the disk has a collar projecting axially along its circumferential boundary, which collar sealingly touches the inner surface of the jacket.
  • the collar can have knurling in the area of its outer circumference, which requires clawing to the inside of the plastic jacket.
  • the collar can have, along its outer circumference, a groove open in the direction of the casing, in which a sealing ring, preferably an O-ring made of elastomeric material, is arranged, the sealing ring sealingly touching the inner surface of the casing under radial prestress.
  • a sealing ring preferably an O-ring made of elastomeric material
  • the jacket and the collar can be designed conically in the area of their mutual contact surfaces in such a way that the contact surfaces have an enlarged diameter axially in the direction of the camshaft.
  • the disk can be pushed into the circular opening of the jacket in the axial direction until a precisely defined press-in force is reached.
  • the disc and / or the casing can also have retaining lugs and / or positioning projections on the mutually facing peripheral surfaces click into place and / or be touched exactly when the final position of the disc within the casing has been reached.
  • the displacement element can be formed by a closed-cell soft foam which is partially arranged in a recess in the outer plunger within the storage space.
  • the displacement element and the recess can be at least partially glued together.
  • the displacement body can consist of a flexible polyurethane foam with a density of 30 to 700 kg / m 3, the production of which is expediently carried out in such a way that an essentially pore-free surface is obtained.
  • the diffusion of oil components into the pores of the flexible foam body, which are closed off from the outside like a balloon, is additionally hindered by this, which favors the achievement of excellent usage properties over a particularly long service life.
  • the displacement element is at least partially bonded to the recess, there is the additional advantage that a direct wetting of the displacement element by the oil contained in the storage space is not possible in the region of the bonding zone.
  • the corresponding zone of the displacement element is hereby protected in an excellent manner against physical and / or chemical effects by the oil contained in the storage space.
  • the embodiment shown in the drawing of a hydraulic valve lash adjuster for a valve train of an internal combustion engine shows an inner tappet 1 and an outer tappet 2, which are arranged to be movable relative to one another in the axial direction.
  • the inner plunger 1 and the outer plunger 2 are assigned to one another in such a way that the oil-filled storage space 3 sealed to the outside has the smallest possible volume.
  • the inner tappet 1 has an enlarged distance in the axial direction from the flat bottom of the outer tappet 2 and is axially movable in both directions.
  • the outer plunger 2 is formed in two parts in this example and has a disc 9 made of metallic material, which forms the flat bottom in the direction of the camshaft 8 and an essentially tubular jacket 7, which is movable in the region of its outer circumference in guides of a cylinder head, not shown here is.
  • the storage space 3 is sealed to the outside and is filled with oil once before the valve lash adjuster is put into operation.
  • a displacement element 4 is arranged within the storage space 3, which is formed in this example by closed-cell soft foam.
  • the displacement element 4 is arranged in a recess 17 of the outer plunger 2 and partially glued to it.
  • the displacement element 4 can contain a gas-filled cavity which is formed, for example, by a flexible and / or elastically deformable gas bubble.
  • the size of the volume changes to be absorbed by the displacement element 4 is particularly dependent on the volume increase experienced by the oil contained in the valve lash adjustment element when it heats up to the operating temperature of the internal combustion engine and / or in the case of a volume change which is caused by a change in the support length of the valve lash adjustment element.
  • a change in the support length can occur, for example, if a valve is still in the open position when the internal combustion engine is shut down and is in this case loaded for a longer period of time by the return spring of the valve, which requires a gradual reduction in the support length (shown here).
  • the original support length is restored after the first revolutions of the camshaft 8.
  • the tubular jacket 7, which consists of thermoplastic material, has sliding surfaces 5, 6 on the inside and outside in the radial direction.
  • the sliding surfaces 5, 6 may contain, for example, circumferential races which are flush with the sliding surfaces 5, 6.
  • the rings can also be made of metallic material, for example, and in particular in the area of the highly stressed zones of the sliding surfaces 5, 6 (in the area of the axial boundary) reduce wear and thereby increase the service life.
  • the disk 9 has a surface 10 hardened in the direction of the camshaft 8 and is provided in the region of its inner circumference with a diameter which decreases in the direction of the storage space 3.
  • the collar 13 is along its outer circumference Provided over its entire axial extent with a knurling, which ensures that the disc 9 is clawed in the jacket 7.
  • the contact surfaces of the jacket 7 and the collar 13 are sealed by an O-ring seal 16, which is located within a groove 15 of the collar 13 which is open in the direction of the jacket 7.
  • the groove 18 in the disk causes increased support in the axial direction.
  • the sinking depth of the disk 9 into the tubular jacket 7 can be limited by a radial projection in the jacket 7, against which the disk 9 lies in the axial direction during assembly.
  • camshaft 8 is greatly reduced and shown schematically.

Abstract

Hydraulic valve clearance compensation element for the valve gear of an internal combustion engine, comprising an inner tappet (1) and an outer tappet (2) which are arranged in such a way that they can move relative to one another in the axial direction, the outer tappet (2) being formed by an essentially cup-shaped housing with a flat base and the inner tappet (1) and the outer tappet (2) delimiting an oil-filled storage space (3) of variable volume sealed off from the outside, enclosed in which is a displacement element (4) for compensating volume changes. The outer tappet (2) is formed by an essentially tubular, thermoplastic shell (7) with sliding surfaces (5, 6) radially on the inside and the outside, at least in part-areas, which shell is fluid-tightly closed in the direction of the camshaft (8) used by a disc (9) designed as an opposed-motion element. The inner sliding surface (5) surrounds the inner tappet (1), resting against this circumference in a fluid-tight manner. <IMAGE>

Description

Die Erfindung betrifft ein hydraulisches Ventilspielausgleichselement für einen Ventiltrieb einer Verbrennungskraftmaschine, umfassend einen Innenstößel und einen Außenstößel, die in axialer Richtung relativ zueinander beweglich angeordnet sind, wobei der Außenstößel von einem im wesentlichen tassenförmigen Gehäuse mit ebenem Boden gebildet ist und wobei der Innen- und der Außenstößel einen volumenveränderlichen, nach außen abgedichteten, ölgefüllten Speicherraum begrenzen, in dem ein Verdrängungselement zum Ausgleich von Volumenveränderungen eingeschlossen ist.The invention relates to a hydraulic valve lash adjuster for a valve train of an internal combustion engine, comprising an inner tappet and an outer tappet, which are arranged so as to be movable relative to one another in the axial direction, the outer tappet being formed by a substantially cup-shaped housing with a flat bottom, and wherein the inner and the Outer tappets limit a variable-volume, oil-filled storage space sealed to the outside, in which a displacement element is enclosed to compensate for changes in volume.

Ein solches Ventilspielausgleichselement ist aus der DE-OS 35 06 730 bekannt. Der darin enthaltene Speicherraum ist durch eine balgartig ausgebildete Dichtung nach außen abgeschlossen. Das vorbekannte hydraulische Ventilspielausgleichselement weist eine in fertigungstechnischer Hinsicht wenig befriedigende Herstellbarkeit auf. Auch die Montage der einzelnen Bauteile, aus denen das hydraulische Ventilspielausgleichselement besteht, ist kompliziert und aufwendig.Such a valve lash adjuster is known from DE-OS 35 06 730. The storage space contained therein is closed to the outside by a bellows-shaped seal. The previously known hydraulic valve lash adjuster has a manufacturability that is unsatisfactory in terms of production technology. The assembly of the individual components that make up the hydraulic valve lash adjuster is complicated and time-consuming.

Der Erfindung liegt die Aufgabe zugrunde, ein Ventilspielausgleichselement für einen Ventiltrieb einer Verbrennungskraftmaschine zu zeigen, das kostengünstig herstellbar ist, bei dem die Montagereihenfolge verbessert ist und das aus weniger Einzelteilen besteht.The invention has for its object to show a valve clearance compensation element for a valve train of an internal combustion engine, which is inexpensive to manufacture, in which the assembly sequence is improved and which consists of fewer individual parts.

Diese Aufgabe wird erfindungsgemäß bei einem Ventilspielausgleichselement der eingangs genannten Art mit den kennzeichnenden Merkmalen von Anspruch 1 gelöst. Auf vorteilhafte Ausgestaltungen nehmen die Unteransprüche Bezug.This object is achieved according to the invention in a valve clearance compensation element of the type mentioned at the outset with the characterizing features of claim 1. The subclaims refer to advantageous configurations.

Bei dem erfindungsgemäßen hydraulischen Ventilspielausgleichselement für einen Ventiltrieb einer Verbrennungskraftmaschine ist es vorgesehen, daß der Außenstößel durch einen im wesentlichen rohrförmigen und zumindest in Teilbereichen radial innen und außenseitig Gleitflächen aufweisenden Mantel aus thermoplastischem Kunststoff gebildet ist, der in Richtung einer zur Anwendung gelangenden Nockenwelle durch eine als Gegenläufer ausgeführte Scheibe flüssigkeitsdicht verschlossen ist und daß die innenseitige Gleitfläche den Innenstößel umfangsseitig anliegend und flüssigkeitsdicht umschließt. Hierbei ist von Vorteil, daß die Montagereihenfolge des Ventilspielausgleichselementes in arbeitsökonomischer Hinsicht deutlich verbessert ist und die Montage selbst aufgrund der Ausgestaltung der einzelnen zu verbindenden Teile wesentlich vereinfacht ist. In den in Richtung der Nockenwelle zunächst noch offenen, rohrförmigen Mantel, dessen innenseitige Gleitfläche den Innenstößel umfangsseitig anliegend und flüssigkeitsdicht umschließt, kann das Verdrängungselement von oben in den Mantel eingesetzt und montiert werden. Anschließend wird der Speicherraum, der auf der von der Nockenwelle abgewandten Seite bereits flüssigkeitsdicht verschlossen ist von oben mit Öl gefüllt. Die als Gegenläufer zur Nockenwelle fungierende Scheibe wird anschließend in den aus thermoplastischem Material bestehenden Mantel eingesetzt. Hierbei kann zur Entlüftung und zur genauen Einstellung des sich ergebenden Innendruckes eine Entlüftungsbohrung vorgesehen werden, die nach erfolgter Montage z. B. mit einer Kugel flüssigkeitsdichte verschlossen wird.In the hydraulic valve lash compensation element according to the invention for a valve train of an internal combustion engine, it is provided that the outer tappet is formed by an essentially tubular jacket made of thermoplastic plastic and at least in some areas radially inside and outside with sliding surfaces, which in the direction of a camshaft used by a as Counter-running disc is sealed liquid-tight and that the inner sliding surface encloses the inner plunger on the circumferential side and liquid-tight. The advantage here is that the assembly sequence of the valve clearance compensation element is significantly improved in terms of labor economy and the assembly itself is considerably simplified due to the design of the individual parts to be connected. The displacement element can be inserted and mounted in the jacket from above in the tubular jacket which is initially still open in the direction of the camshaft and whose inside sliding surface surrounds the inside tappet in a circumferential and liquid-tight manner. Then the storage space, which is already liquid-tight on the side facing away from the camshaft, is filled with oil from above. The disc, which acts as a counter-rotor to the camshaft, is then inserted into the jacket made of thermoplastic material. Here, a vent hole can be provided for venting and for precise adjustment of the resulting internal pressure. B. is sealed liquid-tight with a ball.

Gemäß einer vorteilhaften Ausgestaltung ist es vorgesehen, daß die Scheibe aus metallischem Werkstoff besteht und eine in Richtung der Nockenwelle gehärtete Oberfläche aufweist. Die gehärtete Oberfläche der Scheibe bedingt gute Gebrauchseigenschaften während einer langen Gebrauchsdauer. Die Scheibe, die nachträglich in den Kunststoffmantel, der einen Bestandteil des Außenstößels bildet, eingesetzt wird, kann beispielsweise vor dem Einsetzen auf eine Temperatur erwärmt werden, die das thermoplastische Material des Mantels an der der Scheibe zugewandten Oberfläche aufschmelzen läßt und nach dem Erkalten die Scheibe zuverlässig in ihrer Position hält. Eine andere Möglichkeit, die Scheibe im Mantel festzulegen, kann darin bestehen, die Scheibe zunächst in den Mantel aus thermoplastischem Kunststoff einzulegen und diesen anschließend im Bereich der Kontaktfläche mit Ultraschall so lange zu bestrahlen, bis eine sichere Verbindung von Mantel und Scheibe erfolgt ist.According to an advantageous embodiment, it is provided that the disk consists of metallic material and has a surface hardened in the direction of the camshaft. The hardened surface of the disc ensures good usage properties over a long period of use. The disc, which is subsequently inserted into the plastic jacket, which forms part of the outer plunger, can, for example, be heated to a temperature before insertion, which allows the thermoplastic material of the jacket to melt on the surface facing the disc and, after cooling, the disc holds reliably in position. Another possibility of fixing the disk in the jacket can be to first insert the disk into the jacket made of thermoplastic material and then to irradiate it in the area of the contact area with ultrasound until a secure connection of the jacket and disk has taken place.

Nach einer anderen Ausgestaltung kann die Scheibe aus keramischen Werkstoff bestehen.According to another embodiment, the disk can be made of ceramic material.

Zur flüssigkeitsdichten, beweglichen Anordnung von Außenstößel und Innenstößel relativ zueinander kann die innenseitige Gleitfläche des Außenstößels eine in Richtung des Innenstößels geöffnete, umlaufende Nut aufweisen, in der ein Dichtring angeordnet ist, wobei der Dichtring den Innenstößel während der bestimmungsgemäßen Verwendung unter radialer Vorspannung anliegend und dichtend berührt. Der Dichtring kann beispielsweise durch einen O-Ring gebildet sein. O-Ringe sind in den verschiedensten Abmessungen in großen Stückzahlen einfach und preiswert verfügbar, was im Hinblick auf eine wirtschaftliche Herstellbarkeit des erfindungsgemäßen Ventilspielausgleichselementes von hervorzuhebender Bedeutung ist.For the liquid-tight, movable arrangement of the outer plunger and inner plunger relative to one another, the inner sliding surface of the outer plunger can have a circumferential groove which is open in the direction of the inner plunger and in which a sealing ring is arranged, the sealing ring fitting and sealing the inner plunger during intended use under radial prestress touched. The sealing ring can be formed, for example, by an O-ring. O-rings are easily and inexpensively available in large quantities in a wide variety of dimensions, which is of particular importance with regard to the economic producibility of the valve lash compensation element according to the invention.

Eine einfache und zuverlässige Festlegung der Scheibe während der gesamten Gebrauchsdauer des Ventilspielausgleichselementes kann dadurch gewährleistet sein, daß die Scheibe entlang ihrer umfangsseitigen Begrenzung einen axial in Richtung des Speicherraumes vorspringenden Kragen aufweist, der die Innenfläche des Mantels dichtend berührt. Der Kragen kann im Bereich seines Außenumfanges eine Rändelung aufweisen, die eine Verkrallung mit der Innenseite des Kunststoffmantels bedingt. Zusätzlich oder alternativ kann der Kragen entlang seines Außenumfangs eine in Richtung des Mantels geöffnete Nut aufweisen, in der ein Dichtring, bevorzugt ein O-Ring aus elastomerem Werkstoff, angeordnet ist, wobei der Dichtring unter radialer Vorspannung die Innenfläche des Mantels dichtend berührt. Bei Einsetzen einer erwämten Scheibe in den thermoplastischen Mantel wird eine Verkrallung zwischen den Berührungsflächen begünstigt. Eine zusätzliche Sicherheit gegen einen Flüssigkeitsverlust des abgeschlossenen Speicherraumes während einer langen Gebrauchsdauer gewährleistet beispielsweise ein O-Ring, der die Trennungsfuge unter radialer Vorspannung dichtend anliegend verschließt.A simple and reliable fixing of the disk during the entire service life of the valve clearance compensation element can be ensured in that the disk has a collar projecting axially along its circumferential boundary, which collar sealingly touches the inner surface of the jacket. The collar can have knurling in the area of its outer circumference, which requires clawing to the inside of the plastic jacket. Additionally or alternatively, the collar can have, along its outer circumference, a groove open in the direction of the casing, in which a sealing ring, preferably an O-ring made of elastomeric material, is arranged, the sealing ring sealingly touching the inner surface of the casing under radial prestress. When a heated pane is inserted into the thermoplastic jacket, clawing between the contact surfaces is promoted. An additional security against loss of liquid in the closed storage space during a long period of use is ensured, for example, by an O-ring which seals the separating joint in a sealing manner under radial prestress.

Im Hinblick auf eine weiter vereinfachte Montage können der Mantel und der Kragen im Bereich ihrer gegenseitigen Berührungsflächen konisch derart ausgebildet sein, daß die Berührungsflächen einen axial in Richtung der Nockenwelle erweiterten Durchmesser aufweisen. Die Scheibe kann bei dieser Ausgestaltung so lange in axialer Richtung in die kreisförmige Öffnung des Mantels eingeschoben werden, bis eine genau definierte Einpreßkraft erreicht ist. Auch können die Scheibe und/oder der Mantel auf den einander zugewandten Umfangsflächen Haltenasen und/oder Positionierungsvorsprünge aufweisen, die genau dann einrasten und/oder anliegend berührt werden, wenn die endgültige Position der Scheibe innerhalb des Mantels erreicht ist.With a view to a further simplified assembly, the jacket and the collar can be designed conically in the area of their mutual contact surfaces in such a way that the contact surfaces have an enlarged diameter axially in the direction of the camshaft. In this embodiment, the disk can be pushed into the circular opening of the jacket in the axial direction until a precisely defined press-in force is reached. The disc and / or the casing can also have retaining lugs and / or positioning projections on the mutually facing peripheral surfaces click into place and / or be touched exactly when the final position of the disc within the casing has been reached.

Das Verdrängungselement kann durch einen geschlossenzelligen Weichschaum gebildet sein, der teilweise in einer Ausnehmung des Außenstößels innerhalb des Speicherraumes angeordnet ist. Das Verdrängungselement und die Ausnehmung können zumindest teilweise miteinander verklebt sein. Beispielsweise kann der Verdrängungskörper aus einem Polyurethanweichschaum einer Dichte von 30 bis 700 kg/m³ bestehen, wobei seine Herstellung zweckmäßigerweise so vorgenommen wird, daß eine im wesentlichen porenfreie Oberfläche erhalten wird. Das Eindiffundieren von Ölbestandteilen in die ballonartig nach außen abgeschlossenen Poren des Weichschaumkörpers wird hierdurch zusätzlich behindert, was die Erzielung ausgezeichneter Gebrauchseigenschaften während einer besonders langen Gebrauchsdauer begünstigt.The displacement element can be formed by a closed-cell soft foam which is partially arranged in a recess in the outer plunger within the storage space. The displacement element and the recess can be at least partially glued together. For example, the displacement body can consist of a flexible polyurethane foam with a density of 30 to 700 kg / m 3, the production of which is expediently carried out in such a way that an essentially pore-free surface is obtained. The diffusion of oil components into the pores of the flexible foam body, which are closed off from the outside like a balloon, is additionally hindered by this, which favors the achievement of excellent usage properties over a particularly long service life.

Bei einer zumindest teilweisen Verklebung des Verdrängungselementes mit der Ausnehmung resultiert der zusätzliche Vorteil, daß im Bereich der Verklebungszone eine unmittelbare Benetzung des Verdrängungselementes durch das in dem Speicherraum enthaltene Öl nicht möglich ist. Die entsprechende Zone des Verdrängungselementes ist hierdurch in ausgezeichneter Weise vor eine physikalischen und/oder chemischen Einwirkung durch das im Speicherraum enthaltene Öl geschützt.If the displacement element is at least partially bonded to the recess, there is the additional advantage that a direct wetting of the displacement element by the oil contained in the storage space is not possible in the region of the bonding zone. The corresponding zone of the displacement element is hereby protected in an excellent manner against physical and / or chemical effects by the oil contained in the storage space.

Der Gegenstand der vorliegenden Erfindung wird nachfolgend anhand der in der Anlage beigefügten Zeichnung weiter verdeutlicht.The object of the present invention is further illustrated below with reference to the accompanying drawing.

Diese zeigt ein Ausführungsbeispiel des erfindungsgemäßen Ventilspielausgleichselementes in schematischer und geschnittener Darstellung.This shows an embodiment of the valve clearance compensation element according to the invention in a schematic and sectional view.

Das in der Zeichnung dargestellte Ausführungsbeispiel eines hydraulischen Ventilspielausgleichselementes für einen Ventiltrieb einer Verbrennungskraftmaschine zeigt einen Innenstößel 1 und eine Außenstößel 2, die in axialer Richtung relativ zueinander beweglich angeordnet sind. In der Zeichnung sind der Innenstößel 1 und der Außenstößel 2 einander derart zugeordnet, daß der nach außen abgedichtete, ölgefüllte Speicherraum 3 das kleinstmögliche Volumen aufweist. Während der bestimmungsgemäßen Verwendung des Spielausgleichselementes weist der Innenstößel 1 von dem ebenen Boden des Außenstößels 2 einen vergrößerten Abstand in axialer Richtung auf und ist axial in beiden Richtungen beweglich. Der Außenstößel 2 ist in diesem Beispiel zweiteilig ausgebildet und weist eine Scheibe 9 aus metallischem Werkstoff auf, die den in Richtung der Nockenwelle 8 ebenen Boden bildet und einen im wesentlichen rohrförmigen Mantel 7, der im Bereich seines Außenumfanges in Führungen eines hier nicht dargestellten Zylinderkopfes beweglich ist. Der Speicherraum 3 ist nach außen abgedichtet und wird vor Inbetriebnahme des Ventilspielausgleichselementes einmalig mit Öl gefüllt. Zum Ausgleich von Volumenveränderungen ist innerhalb des Speicherraumes 3 ein Verdrängungselement 4 angeordnet, das in diesem Beispiel durch geschlossenzelligen Weichschaum gebildet ist. Das Verdrängungselement 4 ist in einer Ausnehmung 17 des Außenstößels 2 angeordnet und mit dieser teilweise verklebt. Das Verdrängungselement 4 kann einen gasgefüllten Hohlraum enthalten, der beispielsweise durch eine flexible und/oder elastisch verformbare Gasblase gebildet ist.The embodiment shown in the drawing of a hydraulic valve lash adjuster for a valve train of an internal combustion engine shows an inner tappet 1 and an outer tappet 2, which are arranged to be movable relative to one another in the axial direction. In the drawing, the inner plunger 1 and the outer plunger 2 are assigned to one another in such a way that the oil-filled storage space 3 sealed to the outside has the smallest possible volume. During the intended use of the play compensation element, the inner tappet 1 has an enlarged distance in the axial direction from the flat bottom of the outer tappet 2 and is axially movable in both directions. The outer plunger 2 is formed in two parts in this example and has a disc 9 made of metallic material, which forms the flat bottom in the direction of the camshaft 8 and an essentially tubular jacket 7, which is movable in the region of its outer circumference in guides of a cylinder head, not shown here is. The storage space 3 is sealed to the outside and is filled with oil once before the valve lash adjuster is put into operation. To compensate for volume changes, a displacement element 4 is arranged within the storage space 3, which is formed in this example by closed-cell soft foam. The displacement element 4 is arranged in a recess 17 of the outer plunger 2 and partially glued to it. The displacement element 4 can contain a gas-filled cavity which is formed, for example, by a flexible and / or elastically deformable gas bubble.

Die größe der durch das Verdrängungselement 4 aufzunehmenden Volumenveränderungen ist insbesondere von der Volumenzunahme abhängig, die das in dem Ventilspielausgleichselement enthaltene Öl bei der Erwärmung auf Betriebstemperatur der Verbrennungskraftmaschine erfährt und/oder bei einer Volumenänderung, die durch eine Veränderung der Stützlänge des Ventilspielausgleichselementes bedingt ist. Eine Änderung der Stützlänge kann sich beispielsweise ergeben, wenn sich ein Ventil bei Außerbetriebsetzung der Brennkraftmaschine noch in Offenstellung befindet und in diesem Falle über eine längere Zeitspanne durch die Rückstellfeder des Ventils belastet ist, was eine allmähliche Reduzierung der Stützlänge bedingt (hier dargestellt). Bei erneuter Inbetriebnahme der Brennkraftmaschine ist nach den ersten Umdrehungen der Nockenwelle 8 eine Wiederherstellung der ursprünglichen Stützlänge gewährleistet.The size of the volume changes to be absorbed by the displacement element 4 is particularly dependent on the volume increase experienced by the oil contained in the valve lash adjustment element when it heats up to the operating temperature of the internal combustion engine and / or in the case of a volume change which is caused by a change in the support length of the valve lash adjustment element. A change in the support length can occur, for example, if a valve is still in the open position when the internal combustion engine is shut down and is in this case loaded for a longer period of time by the return spring of the valve, which requires a gradual reduction in the support length (shown here). When the internal combustion engine is started up again, the original support length is restored after the first revolutions of the camshaft 8.

Der rohrförmige Mantel 7, der aus thermoplastischem Kunststoff besteht, weist in radialer Richtung innen- und außenseitig Gleitflächen 5, 6 auf. Die Gleitflächen 5, 6 können in Abhängigkeit von den jeweiligen Gegebenheiten des Anwendungsfalles beispielsweise umlaufende Laufringe enthalten, die oberflächenbündig mit den Gleitflächen 5, 6 abschließen. Die Ringe können beispielsweise auch aus metallischem Werkstoff bestehen und verringern insbesondere im Bereich der hochbeanspruchten Zonen der Gleitflächen 5, 6 (im Bereich der axialen Begrenzung) den Verschleiß und erhöhen dadurch die Gebrauchsdauer.The tubular jacket 7, which consists of thermoplastic material, has sliding surfaces 5, 6 on the inside and outside in the radial direction. Depending on the particular circumstances of the application, the sliding surfaces 5, 6 may contain, for example, circumferential races which are flush with the sliding surfaces 5, 6. The rings can also be made of metallic material, for example, and in particular in the area of the highly stressed zones of the sliding surfaces 5, 6 (in the area of the axial boundary) reduce wear and thereby increase the service life.

Die Scheibe 9 weist eine in Richtung der Nockenwelle 8 gehärtete Oberfläche 10 auf und ist im Bereich ihres Innenumfanges mit in Richtung des Speicherraumes 3 sich verringerndem Durchmesser versehen. Der Kragen 13 ist entlang seines Außenumfanges über seine gesamte axiale Erstreckung mit einer Rändelung versehen, die eine Verkrallung der Scheibe 9 im Mantel 7 gewährleistet. Zur zusätzlichen Flüssigkeitsabdichtung sind die Berührungsflächen von Mantel 7 und Kragen 13 durch eine O-Ring-Dichtung 16 abgedichtet, die sich innerhalb einer in Richtung des Mantels 7 geöffneten Nut 15 des Kragens 13 befindet. Die Nut 18 in der Scheibe bewirkt eine verstärkte Abstützung in axialer Richtung.The disk 9 has a surface 10 hardened in the direction of the camshaft 8 and is provided in the region of its inner circumference with a diameter which decreases in the direction of the storage space 3. The collar 13 is along its outer circumference Provided over its entire axial extent with a knurling, which ensures that the disc 9 is clawed in the jacket 7. For additional liquid sealing, the contact surfaces of the jacket 7 and the collar 13 are sealed by an O-ring seal 16, which is located within a groove 15 of the collar 13 which is open in the direction of the jacket 7. The groove 18 in the disk causes increased support in the axial direction.

Die Einsinktiefe der Scheibe 9 in den rohrförmigen Mantel 7 kann durch einen radialen Vorsprung im Mantel 7 begrenzt werden, an dem sich die Scheibe 9 bei Montage in axialer Richtung anlegt.The sinking depth of the disk 9 into the tubular jacket 7 can be limited by a radial projection in the jacket 7, against which the disk 9 lies in the axial direction during assembly.

Die Nockenwelle 8 ist in diesem Beispiel stark verkleinert und schematisch dargestellt.In this example, the camshaft 8 is greatly reduced and shown schematically.

Claims (11)

Hydraulisches Ventilspielausgleichselement für einen Ventiltrieb einer Verbrennungskraftmaschine, umfassend einen Innenstößel und einen Außenstößel, die in axialer Richtung relativ zueinander beweglich angeordnet sind, wobei der Außenstößel von einem im wesentlichen tassenförmigen Gehäuse mit ebenem Boden gebildet ist und wobei der Innen- und der Außenstößel einen volumenveränderlichen, nach außen abgedichteten, ölgefüllten Speicherraum begrenzen, in dem ein Verdrängungselement zu Ausgleich von Volumenveränderungen eingeschlossen ist, dadurch gekennzeichnet, daß der Außenstößel (2) durch einen im wesentlichen rohrförmigen und zumindest in Teilbereichen radial innen- und außenseitig Gleitflächen (5, 6) aufweisenden Mantel (7) aus thermoplastischem Kunststoff gebildet ist, der in Richtung einer zur Anwendung gelangenden Nockenwelle (8) durch eine als Gegenläufer ausgeführte Scheibe (9) flüssigkeitsdicht verschlossen ist und daß die innenseitige Gleitfläche (5) den Innenstößel (1) umfangsseitig anliegend und flüssigkeitsdicht umschließt.Hydraulic valve lash adjuster for a valve train of an internal combustion engine, comprising an inner tappet and an outer tappet, which are arranged to be movable relative to one another in the axial direction, the outer tappet being formed by a substantially cup-shaped housing with a flat bottom, and the inner and outer tappets having a volume-variable, Limit the oil-filled storage space which is sealed off from the outside and in which a displacement element for compensating for volume changes is enclosed, characterized in that the outer plunger (2) is provided with an essentially tubular jacket and at least in some areas with radially inside and outside sliding surfaces (5, 6) (7) is made of thermoplastic material, which is sealed in the direction of a camshaft (8) used by a disk (9) designed as a counter-rotor and that the inside sliding surface (5) encloses the inner plunger (1) in a circumferential and liquid-tight manner. Ventilspielausgleichselement nach Anspruch 1, dadurch gekennzeichnet, daß die Scheibe (9) aus metallischem Werkstoff besteht und eine in Richtung der Nockenwelle (8) gehärtete Oberfläche (10) aufweist.Valve clearance compensation element according to claim 1, characterized in that the disc (9) consists of metallic material and has a surface (10) hardened in the direction of the camshaft (8). Ventilspielausgleichselement nach Anspruch 1, dadurch gekennzeichnet, daß die Scheibe (9) aus keramischem Werkstoff besteht.Valve clearance compensation element according to claim 1, characterized in that the disc (9) consists of ceramic material. Ventilspielausgleichselement nach Anspruch 1 bis 3, dadurch gekennzeichnet, daß die innenseitige Gleitfläche (5) eine in Richtung des Innenstößels (1) geöffnete umlaufende Nut (11) aufweist, in der ein Dichtring (12) angeordnet ist und daß der Dichtring (12) den Innenstößel (1) unter radialer Vorspannung dichtend berührt.Valve clearance compensation element according to Claims 1 to 3, characterized in that the inside sliding surface (5) has a circumferential groove (11) which is open in the direction of the inner tappet (1) and in which a sealing ring (12) is arranged and that the sealing ring (12) has the Inner plunger (1) touches sealingly under radial preload. Ventilspielausgleichselement nach Anspruch 4, dadurch gekennzeichnet, daß der Dichtring (12) durch einen O-Ring gebildet ist.Valve clearance compensation element according to claim 4, characterized in that the sealing ring (12) is formed by an O-ring. Ventilspielausgleichselement nach Anspruch 1 bis 3, dadurch gekennzeichnet, daß die Scheibe (9) entlang ihrer umfangsseitigen Begrenzung einen axial in Richtung des Speicherraumes (3) vorspringenden Kragen (13) aufweist, der die Innenfläche (14) des Mantels (7) dichtend berührt.Valve clearance compensation element according to Claims 1 to 3, characterized in that the disk (9) has, along its circumferential boundary, a collar (13) projecting axially in the direction of the storage space (3) and sealingly touching the inner surface (14) of the casing (7). Ventilspielausgleichselement nach Anspruch 6, dadurch gekennzeichnet, daß der Kragen (13) im Bereich seines Außenumfangs eine Rändlung aufweist.Valve clearance compensation element according to claim 6, characterized in that the collar (13) has knurling in the area of its outer circumference. Ventilspielausgleichselement nach Anspruch 6 bis 7, dadurch gekennzeichnet, daß der Kragen (13) entlang seines Außenumfanges eine in Richtung des Mantels (7) geöffnete Nut (15) aufweist, in der ein Dichtring (16) aus elastomerem Werkstoff angeordnet ist und daß der Dichtring (16) unter radialer Vorspannung die Innenfläche (14) des Mantels (7) dichtend berührt.Valve clearance compensation element according to claims 6 to 7, characterized in that the collar (13) has along its outer circumference a groove (15) open in the direction of the casing (7), in which a sealing ring (16) made of elastomeric material is arranged and that the sealing ring (16) sealingly touches the inner surface (14) of the jacket (7) under radial prestress. Ventilspielausgleichselement nach Anspruch 1 bis 8, dadurch gekennzeichnet, daß der Mantel (7) und der Kragen (13) im Bereich ihrer gegenseitigen Berührungsflächen konisch derart ausgebildet sind, daß die Berührungsflächen einen axial in Richtung der Nockenwelle (8) erweiterten Durchmesser aufweisen.Valve clearance compensation element according to Claims 1 to 8, characterized in that the jacket (7) and the collar (13) are conical in the region of their mutual contact surfaces such that the contact surfaces have an enlarged diameter axially in the direction of the camshaft (8). Ventilspielausgleichselement nach Anspruch 1 bis 9, dadurch gekennzeichnet, daß das Verdrängungselement (4) durch einen geschlossenzelligen Weichschaum gebildet ist, der teilweise in einer Ausnehmung (17) des Außenstößels (2) innerhalb des Speicherraumes (3) angeordnet ist.Valve clearance compensation element according to claims 1 to 9, characterized in that the displacement element (4) is formed by a closed-cell soft foam which is partially arranged in a recess (17) of the outer tappet (2) within the storage space (3). Ventilspielausgleichselement nach Anspruch 10, dadurch gekennzeichnet, daß das Verdrängungselement (4) und die Ausnehmung (17) zumindest teilweise miteinander verklebt sind.Valve clearance compensation element according to claim 10, characterized in that the displacement element (4) and the recess (17) are at least partially glued to one another.
EP92114351A 1992-02-11 1992-08-22 Hydraulic valve tappet Expired - Lifetime EP0555521B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4203897A DE4203897C2 (en) 1992-02-11 1992-02-11 Hydraulic valve lash adjuster
DE4203897 1992-02-11

Publications (2)

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EP0555521A1 true EP0555521A1 (en) 1993-08-18
EP0555521B1 EP0555521B1 (en) 1995-10-25

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ID=6451374

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EP92114351A Expired - Lifetime EP0555521B1 (en) 1992-02-11 1992-08-22 Hydraulic valve tappet

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US (1) US5295460A (en)
EP (1) EP0555521B1 (en)
JP (1) JP2585941B2 (en)
BR (1) BR9204630A (en)
CA (1) CA2089100C (en)
DE (2) DE4203897C2 (en)
ES (1) ES2079756T3 (en)

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JPH08226312A (en) * 1995-02-20 1996-09-03 Fuji Oozx Inc Valve clearance adjusting method and valve lifter and intermediate used for it
WO2010023747A1 (en) * 2008-08-28 2010-03-04 トヨタ自動車株式会社 Hermetically sealed rush adjuster

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BR9204630A (en) 1993-08-17
CA2089100A1 (en) 1993-08-12
CA2089100C (en) 1997-10-07
DE4203897A1 (en) 1993-08-12
EP0555521B1 (en) 1995-10-25
DE4203897C2 (en) 1994-01-27
ES2079756T3 (en) 1996-01-16
DE59204141D1 (en) 1995-11-30
JPH0617616A (en) 1994-01-25
JP2585941B2 (en) 1997-02-26
US5295460A (en) 1994-03-22

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