EP2295739B1 - Valve drive for a combustion engine - Google Patents

Valve drive for a combustion engine Download PDF

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Publication number
EP2295739B1
EP2295739B1 EP10169651A EP10169651A EP2295739B1 EP 2295739 B1 EP2295739 B1 EP 2295739B1 EP 10169651 A EP10169651 A EP 10169651A EP 10169651 A EP10169651 A EP 10169651A EP 2295739 B1 EP2295739 B1 EP 2295739B1
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EP
European Patent Office
Prior art keywords
valve drive
drag lever
drive according
cross strut
supporting element
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.)
Not-in-force
Application number
EP10169651A
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German (de)
French (fr)
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EP2295739A1 (en
Inventor
Helmut Engelhardt
Ulrich Linnenbrink
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.)
Schaeffler Technologies AG and Co KG
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Schaeffler Technologies AG and Co KG
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Publication of EP2295739A1 publication Critical patent/EP2295739A1/en
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Publication of EP2295739B1 publication Critical patent/EP2295739B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • F01L1/185—Overhead end-pivot rocking arms
    • 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
    • F01L1/2405—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically by means of a hydraulic adjusting device located between the cylinder head and rocker arm
    • 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
    • F01L1/26—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder
    • F01L1/267—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder with means for varying the timing or the lift of the valves
    • 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
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0005—Deactivating valves
    • 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
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • F01L1/053—Camshafts overhead type
    • F01L2001/0537—Double overhead camshafts [DOHC]
    • 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
    • F01L2305/00—Valve arrangements comprising rollers

Definitions

  • the invention relates to a variable cam follower valve train of an internal combustion engine for the simultaneous application of two equally-acting gas exchange valves per cylinder, with a provided with hydraulic lash adjuster support element per cylinder, which is installed in a seated between two gas channels receiving a cylinder head, wherein on the support a rocker arm an end is mounted, which is immanent at its top a Nockenanlauf phenomenon, and wherein the gas exchange valves are connected by an overlying transverse strut, which is an integral part of the finger lever at the other end.
  • valve train is from the document DE 10 2007 020108 A1 known.
  • cam follower valve drives of variable design which need not be explained in detail at this point, occur especially in those with external turn-off support elements considerable space problems.
  • These elements build wider and deeper than non-switchable "classic" elements. Thus, these are with their shots in many cases too close (above or to the side) on gas channels of the cylinder head.
  • a subsequent implementation of turn-off support elements in existing and still to be enlarged recordings of the cylinder head is not possible.
  • the object of the invention is therefore to propose a variable valve train, which can be used in tight cylinder head conditions and whose construction costs and costs are within limits.
  • this object is achieved in that the respective receptacle for the support element is lower than an upper side of the laterally adjacent gas channels, wherein the support element has a switchable type with a pot-like housing, in which an inner element with radially extendable coupling means is telescopically installed. So there is a combination of a disconnectable support element with only one finger lever for two equally-acting gas exchange valves per cylinder of the internal combustion engine, in which the respective receptacle for the support element is lower than an upper side of the laterally adjacent gas channels.
  • the rocker arm can either be shown as a fork rocker lever, which simultaneously actuates two equally-acting gas exchange valves at its other end, or it can be present as a "classic" bar-shaped component and act at its other end on a connecting the gas exchange valves cross strut.
  • the support element is implemented in a seated between two gas channels receiving the cylinder head.
  • the drag lever in the region of its other end should have a cross strut, which is an integral part of this and which acts with its underside on the same gas exchange valves in the lifting sense.
  • the drag lever here has a fork-like geometry in plan view.
  • the drag lever is called "classic", bar-shaped component provided from the mass production, which acts in the region of its other end on a separate crossbar, which bridges the respective gas exchange valves.
  • the drag lever is made of inexpensive sheet metal and, for example, be punched from a board or tape.
  • Abstützbarer Abschaltbarer design is a well-known from the prior art component in question (see, for example. DE 102 47 949 A1 ). This can ultimately be used unaltered and possibly hinged to the rocker arm as a unit to be delivered.
  • a particularly low-friction cam tap on the drag lever is present when the drag lever is provided for this purpose with a rotatable roller. Alternatively, a sliding surface is provided.
  • the support element should be provided with a hydraulic clearance compensation device, so that unnecessary mechanical clearance adjustment.
  • a cylinder deactivation is to be realized via the proposed inventive design, as is useful in internal combustion engines with a number of cylinders>5; but not exclusively.
  • FIG. 1 Is shown in FIG. 1 a variable valve train 1 of an internal combustion engine.
  • FIG. 3 This shows in more detail, each cylinder 4 two in the camshaft direction one behind the other, the same effect gas exchange valves 2, 3 are provided.
  • a fork-like drag lever 10 On the gas exchange valves 2, 3 is a fork-like drag lever 10 with a trained at its other end 15 cross member 14.
  • a lateral guidance of the drag lever 10 on the gas exchange valves 2, 3 is realized by guide plates 19.
  • the latter go, as closer in FIG. 1 discloses from an end face 20 of the toggle lever 10 at the other end 15 and are bent on a bottom 18 of the finger lever 10.
  • a guide takes place on inner sides 21 of the gas exchange valves 2, 3.
  • the support member 5 is optimally positioned with its receptacle 8 of the cylinder head 9 between the gas ducts 6, 7 (see FIG. 3 ).
  • One reason for the receptacle 8 is lower than an upper side of the gas channels 6, 7.
  • the aforementioned transverse strut 14 of the finger lever 10 may also be formed separately, so that the drag lever 10 acts with its other end 15 on an upper side of the transverse strut 14, in which case the drag lever 10 has a completely elongated, beam-like design.
  • the drag lever 10 is made of thin-walled steel sheet and has two upright side walls 17, which are connected by a transverse bar 16, so that in cross-section a U-shaped profile is present. From FIG. 1 an apparent role in the follower lever 10 forms a cam contact surface 13 for a not shown lifting cam of a corresponding intake or exhaust camshaft (DOHC valve train).
  • DOHC valve train corresponding intake or exhaust camshaft
  • FIG. 2 apparent support 5 disconnectable type will not be described in detail at this point, because it is well known to the art.
  • it consists of a pot-like housing 22, which sits in the receptacle 8 of the cylinder head 9.
  • an inner element 23 is telescopically installed, which has radially extendable coupling means 24.
  • the coupling means 24 are retracted via hydraulic fluid pressure so that the inner member 23 completes an idle stroke relative to the housing 22, as the pivot point for the drag lever 10 then the gas exchange valves 2, 3 count, which thus remain closed.
  • valve drive 1 proposed here is also conceivable and provided for cylinder heads with internal support elements.

Abstract

The variable dual overhead camshaft valve gear (1) has a disconnected supporting element for each cylinder, which is inserted in a support of a cylinder head seated between two gas channels. A rocker finger (10) is supported at an end (11) on the supporting element.

Description

Gebiet der ErfindungField of the invention

Die Erfindung betrifft einen variablen Schlepphebel-Ventiltrieb einer Brennkraftaschine zur gleichzeitigen Beaufschlagung von zwei gleichwirkenden Gaswechselventilen je Zylinder, mit einem mit hydraulischem Ventilspielausgleich versehenen Abstützelement je Zylinder, das in eine zwischen zwei Gaskanälen sitzende Aufnahme eines Zylinderkopfes eingebaut ist, wobei auf dem Abstützelement ein Schlepphebel an einem Ende gelagert ist, dem an seiner Oberseite eine Nockenanlauffläche immanent ist, und wobei die Gaswechselventile durch eine aufliegende Querstrebe verbunden sind, die integraler Bestandteil des Schlepphebels an dessen anderem Ende ist.The invention relates to a variable cam follower valve train of an internal combustion engine for the simultaneous application of two equally-acting gas exchange valves per cylinder, with a provided with hydraulic lash adjuster support element per cylinder, which is installed in a seated between two gas channels receiving a cylinder head, wherein on the support a rocker arm an end is mounted, which is immanent at its top a Nockenanlauffläche, and wherein the gas exchange valves are connected by an overlying transverse strut, which is an integral part of the finger lever at the other end.

Hintergrund der ErfindungBackground of the invention

Ein solcher Ventiltrieb ist aus dem Dokument DE 10 2007 020108 A1 bekannt. Bei Schlepphebel-Ventiltrieben variabler Bauart, die an dieser Stelle nicht näher erläutert werden müssen, treten insbesondere bei solchen mit außen liegenden abschaltbaren Abstützelementen erhebliche Bauraumprobleme auf. Diese Elemente bauen breiter und tiefer als nichtschaltbare "klassische" Elemente. Somit liegen diese mit ihren Aufnahmen in vielen Fällen zu nahe (oberhalb oder seitlich) an Gaskanälen des Zylinderkopfes. Gegebenenfalls ist eine nachträgliche Implementierung von abschaltbaren Abstützelementen in vorhandene und noch zu vergrößernde Aufnahmen des Zylinderkopfes nicht möglich.Such a valve train is from the document DE 10 2007 020108 A1 known. In cam follower valve drives of variable design, which need not be explained in detail at this point, occur especially in those with external turn-off support elements considerable space problems. These elements build wider and deeper than non-switchable "classic" elements. Thus, these are with their shots in many cases too close (above or to the side) on gas channels of the cylinder head. Optionally, a subsequent implementation of turn-off support elements in existing and still to be enlarged recordings of the cylinder head is not possible.

Aufgabe der ErfindungObject of the invention

Aufgabe der Erfindung ist es daher, einen variablen Ventiltrieb vorzuschlagen, der bei beengten Zylinderkopfverhältnissen eingesetzt werden kann und dessen Bauaufwand und Kosten sich im Rahmen halten.The object of the invention is therefore to propose a variable valve train, which can be used in tight cylinder head conditions and whose construction costs and costs are within limits.

Lösung der AufgabeSolution of the task

Erfindungsgemäß wird diese Aufgabe dadurch gelöst, dass die jeweilige Aufnahme für das Abstützelement tiefer liegt, als eine Oberseite der lateral angrenzenden Gaskanäle, wobei das Abstützelement eine abschaltbare Bauart mit einem topfartigen Gehäuse aufweist, in welches teleskopartig ein Innenelement mit radial ausfahrbaren Koppelmitteln eingebaut ist. Es liegt also eine Kombination von einem abschaltbaren Abstützelement mit lediglich einem Schlepphebel für zwei gleichwirkende Gaswechselventile je Zylinder der Brennkraftmaschine vor, bei der die jeweilige Aufnahme für das Abstützelement tiefer liegt, als eine Oberseite der lateral angrenzenden Gaskanäle.According to the invention, this object is achieved in that the respective receptacle for the support element is lower than an upper side of the laterally adjacent gas channels, wherein the support element has a switchable type with a pot-like housing, in which an inner element with radially extendable coupling means is telescopically installed. So there is a combination of a disconnectable support element with only one finger lever for two equally-acting gas exchange valves per cylinder of the internal combustion engine, in which the respective receptacle for the support element is lower than an upper side of the laterally adjacent gas channels.

Der Schlepphebel kann entweder als Gabelschlepphebel dargestellt sein, der an seinem anderen Ende gleichzeitig zwei gleichwirkende Gaswechselventile betätigt, oder er kann als "klassisch" balkenförmiges Bauteil vorliegen und an seinem anderen Ende auf eine die Gaswechselventile verbindende Querstrebe einwirken. Das Abstützelement ist in eine zwischen zwei Gaskanälen sitzende Aufnahme des Zylinderkopfes implementiert. Somit sind die eingangs beschriebenen Nachteile beseitigt. Je Zylinder liegt nur ein abschaltbares Abstützelement vor, dessen Aufnahme zwischen zwei Gaskanälen verläuft.The rocker arm can either be shown as a fork rocker lever, which simultaneously actuates two equally-acting gas exchange valves at its other end, or it can be present as a "classic" bar-shaped component and act at its other end on a connecting the gas exchange valves cross strut. The support element is implemented in a seated between two gas channels receiving the cylinder head. Thus, the disadvantages described above are eliminated. Each cylinder is only a disconnectable support before, the recording runs between two gas ducts.

Es liegt auf der Hand, dass aufgrund der verringerten Teilezahl gegenüber dem Stand der Technik der Montageaufwand und die Kosten gesenkt sind. Vorgeschlagen sind zwei Varianten für den aufliegenden Schlepphebel. Gemäß einer ersten Variante soll der Schlepphebel im Bereich seines anderen Endes eine Querstrebe besitzen, die integraler Bestandteil von diesem ist und die mit ihrer Unterseite auf die gleichwirkenden Gaswechselventile im Hubsinn einwirkt. Der Schlepphebel hat hierbei in der Draufsicht eine gabelähnliche Geometrie. Gemäß einer zweiten Variante ist der Schlepphebel als "klassisches", balkenförmiges Bauteil aus der Massenproduktion vorgesehen, das im Bereich seines anderen Endes auf einen separaten Querbalken einwirkt, welcher die respektiven Gaswechselventile überbrückt.It is obvious that due to the reduced number of parts compared to the prior art, the assembly costs and costs are reduced. Suggested are two variants for the overhead drag lever. According to a first variant, the drag lever in the region of its other end should have a cross strut, which is an integral part of this and which acts with its underside on the same gas exchange valves in the lifting sense. The drag lever here has a fork-like geometry in plan view. According to a second variant, the drag lever is called "classic", bar-shaped component provided from the mass production, which acts in the region of its other end on a separate crossbar, which bridges the respective gas exchange valves.

Nach einem weiteren Vorschlag soll der Schlepphebel aus preiswertem Blech bestehen und bspw. aus einer Platine oder Band gestanzt sein.After a further proposal, the drag lever is made of inexpensive sheet metal and, for example, be punched from a board or tape.

Zur Darstellung eines steifen sowie dünnwandigen Profils für den Schlepphebel kommt ein U- oder ein H-Profil infrage. Gegebenenfalls ist auch ein umgekehrtes U-Profil denkbar und vorgesehen.To represent a stiff and thin-walled profile for the cam follower is a U or an H-profile in question. Optionally, an inverted U-profile is conceivable and provided.

Als Abstützelement abschaltbarer Bauart kommt ein aus dem Stand der Technik hinreichend bekanntes Bauteil infrage (siehe bspw. DE 102 47 949 A1 ). Dieses kann letztlich unverändert verwendet und ggf. gelenkig mit dem Schlepphebel verbunden als Baueinheit geliefert werden.As Abstützbarer Abschaltbarer design is a well-known from the prior art component in question (see, for example. DE 102 47 949 A1 ). This can ultimately be used unaltered and possibly hinged to the rocker arm as a unit to be delivered.

Ein besonders reibungsarmer Nockenabgriff am Schlepphebel liegt dann vor, wenn der Schlepphebel hierfür mit einer drehbaren Rolle versehen ist. Alternativ ist auch eine Gleitfläche vorgesehen.A particularly low-friction cam tap on the drag lever is present when the drag lever is provided for this purpose with a rotatable roller. Alternatively, a sliding surface is provided.

Schließlich soll das Abstützelement mit einer hydraulischen Spielausgleichseinrichtung versehen sein, so dass sich mechanische Spieleinstellmaßnahmen erübrigen. Es wird jedoch auch vorgeschlagen, jede Kontaktfläche des Schlepphebels am anderen Ende mit einem hydraulischen Spielausgleichselement zu versehen, was dessen Schiefstellung bei ungleichmäßiger Längung der Gaswechselventile ggf. verhindert.Finally, the support element should be provided with a hydraulic clearance compensation device, so that unnecessary mechanical clearance adjustment. However, it is also proposed to provide each contact surface of the finger lever at the other end with a hydraulic clearance compensation element, which possibly prevents its misalignment at uneven elongation of the gas exchange valves.

Über die vorgeschlagene erfindungsgemäße Ausgestaltung soll insbesondere eine Zylinderabschaltung realisiert werden, so wie sie bei Brennkraftmaschinen mit einer Zylinderzahl >5 sinnvoll ist; jedoch nicht ausschließlich.In particular, a cylinder deactivation is to be realized via the proposed inventive design, as is useful in internal combustion engines with a number of cylinders>5; but not exclusively.

Kurze Beschreibung der ZeichnungShort description of the drawing

Die Erfindung ist anhand der Zeichnung erläutert. Es zeigen:

Figur 1
eine räumliche Ansicht auf den erfindungsgemäßen Ventiltrieb;
Figur 2
ein abschaltbares Abstützelement des Ventiltriebs im Längsschnitt;
Figur 3
in einer schematischen Darstellung eine Draufsicht auf einen Zylinderkopfausschnitt mit Ventiltrieb.
The invention is explained with reference to the drawing. Show it:
FIG. 1
a spatial view of the valve gear according to the invention;
FIG. 2
a disconnectable support element of the valve drive in longitudinal section;
FIG. 3
in a schematic representation of a plan view of a cylinder head section with valve train.

Ausführliche Beschreibung der ZeichnungDetailed description of the drawing

Dargestellt ist in Figur 1 ein variabler Ventiltrieb 1 einer Brennkraftmaschine. Wie Figur 3 hierzu näher zeigt, sind je Zylinder 4 zwei in Nockenwellenrichtung hintereinanderliegende, gleichwirkende Gaswechselventile 2, 3 vorgesehen. Zu diesen führen schematisch gezeichnete Gaskanäle 6, 7.Is shown in FIG. 1 a variable valve train 1 of an internal combustion engine. As FIG. 3 This shows in more detail, each cylinder 4 two in the camshaft direction one behind the other, the same effect gas exchange valves 2, 3 are provided. These lead schematically drawn gas channels 6, 7.

Auf den Gaswechselventilen 2, 3 liegt ein gabelartiger Schlepphebel 10 mit einer an seinem anderen Ende 15 ausgebildeten Querstrebe 14 auf. Eine seitliche Führung des Schlepphebels 10 auf den Gaswechselventilen 2, 3 ist durch Führungslaschen 19 realisiert. Letztgenannte gehen, so wie näher in Figur 1 offenbart, von einer Endstirn 20 des Schlepphebels 10 am anderen Ende 15 aus und sind auf eine Unterseite 18 des Schlepphebels 10 gebogen. Eine Führung erfolgt an Innenseiten 21 der Gaswechselventile 2, 3.On the gas exchange valves 2, 3 is a fork-like drag lever 10 with a trained at its other end 15 cross member 14. A lateral guidance of the drag lever 10 on the gas exchange valves 2, 3 is realized by guide plates 19. The latter go, as closer in FIG. 1 discloses from an end face 20 of the toggle lever 10 at the other end 15 and are bent on a bottom 18 of the finger lever 10. A guide takes place on inner sides 21 of the gas exchange valves 2, 3.

Im Bereich eines Endes 11 liegt der Schlepphebel 10 mit seiner Unterseite 18 auf einem Kopf eines abschaltbaren Abstützelements 5 auf. Das Abstützelement 5 ist mit seiner Aufnahme 8 des Zylinderkopfes 9 optimal genau zwischen den Gaskanälen 6, 7 positioniert (siehe Figur 3). Ein Grund der Aufnahme 8 liegt tiefer als eine Oberseite der Gaskanäle 6, 7.In the region of one end 11 of the drag lever 10 is located with its underside 18 on a head of a turn-off support element 5. The support member 5 is optimally positioned with its receptacle 8 of the cylinder head 9 between the gas ducts 6, 7 (see FIG. 3 ). One reason for the receptacle 8 is lower than an upper side of the gas channels 6, 7.

Die vorgenannte Querstrebe 14 des Schlepphebels 10 kann jedoch auch separat ausgebildet sein, so dass der Schlepphebel 10 mit seinem anderen Ende 15 auf eine Oberseite der Querstrebe 14 einwirkt, wobei dann der Schlepphebel 10 eine komplett längliche, balkenähnliche Gestaltung hat.However, the aforementioned transverse strut 14 of the finger lever 10 may also be formed separately, so that the drag lever 10 acts with its other end 15 on an upper side of the transverse strut 14, in which case the drag lever 10 has a completely elongated, beam-like design.

Der Schlepphebel 10 besteht aus dünnwandigem Stahlblech und hat zwei aufrechte Seitenwände 17, die durch einen Querbalken 16 verbunden sind, so dass im Querschnitt ein U-förmiges Profil vorliegt. Die aus Figur 1 ein ersichtliche Rolle im Schlepphebel 10 bildet eine Nockenanlauffläche 13 für einen nicht dargestellten Hubnocken einer entsprechenden Einlass- oder Auslassnockenwelle (DOHC-Ventiltrieb).The drag lever 10 is made of thin-walled steel sheet and has two upright side walls 17, which are connected by a transverse bar 16, so that in cross-section a U-shaped profile is present. From FIG. 1 an apparent role in the follower lever 10 forms a cam contact surface 13 for a not shown lifting cam of a corresponding intake or exhaust camshaft (DOHC valve train).

Das näher aus Figur 2 ersichtliche Abstützelement 5 abschaltbarer Art wird an dieser Stelle nicht näher beschrieben, weil es der Fachwelt hinreichend bekannt ist. Im Wesentlichen besteht es aus einem topfartigen Gehäuse 22, das in der Aufnahme 8 des Zylinderkopfes 9 sitzt. In das Gehäuse 22 ist teleskopartig ein Innenelement 23 eingebaut, welches radial ausfahrbare Koppelmittel 24 hat. Im Abschaltfall werden die Koppelmittel 24 über Hydraulikmitteldruck so eingefahren, dass das Innenelement 23 einen Leerhub gegenüber dem Gehäuse 22 vollzieht, wobei als Schwenkpunkt für den Schlepphebel 10 dann die Gaswechselventile 2, 3 zählen, welche somit geschlossen bleiben.The closer FIG. 2 apparent support 5 disconnectable type will not be described in detail at this point, because it is well known to the art. In essence, it consists of a pot-like housing 22, which sits in the receptacle 8 of the cylinder head 9. In the housing 22, an inner element 23 is telescopically installed, which has radially extendable coupling means 24. In the shutdown case, the coupling means 24 are retracted via hydraulic fluid pressure so that the inner member 23 completes an idle stroke relative to the housing 22, as the pivot point for the drag lever 10 then the gas exchange valves 2, 3 count, which thus remain closed.

Selbstverständlich ist ein Einsatz des hier vorgeschlagenen Ventiltriebs 1 auch bei Zylinderköpfen mit innen liegenden Abstützelementen denkbar und vorgesehen.Of course, an insert of the valve drive 1 proposed here is also conceivable and provided for cylinder heads with internal support elements.

Liste der BezugszahlenList of reference numbers

  • 1) Ventiltrieb1) Valve gear
  • 2) Gaswechselventil2) Gas exchange valve
  • 3) Gaswechselventil3) Gas exchange valve
  • 4) Zylinder4) cylinder
  • 5) Abstützelement5) support element
  • 6) Gaskanal6) Gas channel
  • 7) Gaskanal7) Gas channel
  • 8) Aufnahme8) recording
  • 9) Zylinderkopf9) Cylinder head
  • 10)Schlepphebel10) cam followers
  • 11)eines Ende11) one end
  • 12)Oberseite12) top
  • 13)Nockenanlauffläche13) cam contact surface
  • 14)Querstrebe14) transverse strut
  • 15)anderes Ende15) other end
  • 16)Querbalken16) crossbar
  • 17)Seitenwand17) side wall
  • 18)Unterseite18) Base
  • 19)Führungslasche19) guide plate
  • 20)Endstirn (anderes Ende)20) Endface (other end)
  • 21)Innenseite21) inside
  • 22)Gehäuse22) housing
  • 23)Innenelement23) the inner member
  • 24)Koppelmittel24) coupling means

Claims (8)

  1. Variable drag-lever valve drive (1) for an internal combustion engine, for simultaneous action upon two identically acting gas exchange valves (2, 3) per cylinder (4), with, per cylinder, a supporting element (5) which is provided with hydraulic valve clearance compensation and which is built into a receptacle (8), seated between two gas ducts (6, 7), of a cylinder head (9), there being mounted on the supporting element (5), at one end (11), a drag lever (10) intrinsic to which on its top side (12) is a cam run-on surface (13), and the gas exchange valves (2, 3) being connected by means of a cross strut (14) which rests thereon and which is an integral part of the drag lever (10) at the other end (15) of the latter, characterized in that the respective receptacle (8) for the supporting element (5) lies at a lower level than a top side of the laterally adjacent gas ducts (6, 7), the supporting element (5) having a disconnectable type of construction with a pot-like housing (22), into which an inner element (23) with radially extendable coupling means (24) is built telescopically.
  2. Valve drive according to Claim 1, characterized in that the cross strut (14), instead of being an integral part of the drag lever (10), is present separately and is acted upon by the drag lever (10) with its other end (15).
  3. Valve drive according to Claim 1 or 2, the respective receptacle (8) with the supporting element (5) being positioned externally in relation to a surface between a camshaft axial line and a longitudinal centre line of the cylinder head (9).
  4. Valve drive according to Claim 1, the drag lever (10), in the event of its being connected in one part with the cross strut (14), a) consisting of two upright side walls (17) connected by means of a crossbar (16), b) possessing a U- or H-profile in cross section, c) being narrow in a beam-like manner at one end (11), as seen in a top view, and d) widening in a funnel-shaped or fork-shaped manner in the direction of the other end (15), commencing at or after the cam run-on surface (13), so as to form the cross strut (14).
  5. Valve drive according to Claim 1 or 4, there being tied to an underside (18) of the cross strut (14) two guide shins (19) which either emanate in one part from an end face (20) of the cross strut (14) at the other end (15) and run curvedly onto the underside (18), or project in one part from the underside (18), which guide shins (19) are guided either both on insides (21) or both on outsides of the gas exchange valves (2, 3) with respect to a longitudinal mid-plane through the drag lever (10).
  6. Valve drive according to Claim 2, the drag lever (10), in the event of the cross strut (14) being formed separately, being continuously narrow in a beam-like manner and consisting of two upright side walls connected by a crossbar and at least as far as possible identically spaced apart, and the drag lever (10) forming a U-, H- or reversed U-profile in cross section.
  7. Valve drive according to one of Claims 1, 4 or 6, the drag lever (10) consisting of thin-walled lightweight building material, such as sheet steel.
  8. Valve drive according to Claim 1 or 2, a rolling-bearing-mounted or plain-bearing-mounted roller being present as the cam run-on surface (13).
EP10169651A 2009-08-13 2010-07-15 Valve drive for a combustion engine Not-in-force EP2295739B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102009037496A DE102009037496A1 (en) 2009-08-13 2009-08-13 Valve gear of an internal combustion engine

Publications (2)

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EP2295739A1 EP2295739A1 (en) 2011-03-16
EP2295739B1 true EP2295739B1 (en) 2012-03-28

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Application Number Title Priority Date Filing Date
EP10169651A Not-in-force EP2295739B1 (en) 2009-08-13 2010-07-15 Valve drive for a combustion engine

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EP (1) EP2295739B1 (en)
AT (1) ATE551504T1 (en)
DE (1) DE102009037496A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015215194A1 (en) 2015-08-10 2017-02-16 Schaeffler Technologies AG & Co. KG Cam follower lever
GB201522269D0 (en) * 2015-12-17 2016-02-03 Eaton Srl Hydraulic lash adjuster
DE102020117126A1 (en) * 2019-10-16 2021-04-22 Schaeffler Technologies AG & Co. KG Bar-like bridge for a valve train of a heavy-duty internal combustion engine

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4587936A (en) * 1981-09-10 1986-05-13 Honda Giken Kogyo Kabushiki Kaisha Control apparatus for intake and exhaust valves of an internal combustion engine
FR2663682B1 (en) * 1990-06-21 1992-10-16 Peugeot VARIABLE AMPLITUDE DEVICE FOR LIFTING AT LEAST ONE VALVE OF AN INTERNAL COMBUSTION ENGINE.
FR2674287B1 (en) * 1991-03-19 1993-07-23 Peugeot HYDRAULIC CONTROL FOR LIFTING MECHANISM WITH VARIABLE AMPLITUDE OF AT LEAST ONE VALVE OF INTERNAL COMBUSTION ENGINE.
US5259346A (en) * 1992-11-05 1993-11-09 Henley Manufacturing Holding Company, Inc. Rocker arm of the cam-follower type for operating two valves
DE19537641A1 (en) * 1995-10-10 1997-04-17 Bayerische Motoren Werke Ag Point bearing tappet for IC-engine valve
DE10247949A1 (en) 2002-10-15 2004-04-29 Ina-Schaeffler Kg Switchable support element for a valve train of an internal combustion engine
DE102007020108A1 (en) * 2007-04-28 2008-10-30 Schaeffler Kg Cylinder valve cam drive, for an internal combustion motor, has a single support for the cam follower between it and the cylinder head

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DE102009037496A1 (en) 2011-02-17
EP2295739A1 (en) 2011-03-16
ATE551504T1 (en) 2012-04-15

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