EP1049857B1 - Device for interrupting the power flux between at least one valve and at least one cam of a camshaft - Google Patents

Device for interrupting the power flux between at least one valve and at least one cam of a camshaft Download PDF

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Publication number
EP1049857B1
EP1049857B1 EP98965861A EP98965861A EP1049857B1 EP 1049857 B1 EP1049857 B1 EP 1049857B1 EP 98965861 A EP98965861 A EP 98965861A EP 98965861 A EP98965861 A EP 98965861A EP 1049857 B1 EP1049857 B1 EP 1049857B1
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EP
European Patent Office
Prior art keywords
cam
camshaft
coupling element
actuation lever
valve
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP98965861A
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German (de)
French (fr)
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EP1049857A1 (en
Inventor
Peter Hübschle
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Audi AG
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Audi AG
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Publication of EP1049857A1 publication Critical patent/EP1049857A1/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
    • 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
    • F01L1/12—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
    • F01L2820/00—Details on specific features characterising valve gear arrangements
    • F01L2820/03—Auxiliary actuators
    • F01L2820/031—Electromagnets

Definitions

  • the device described therein has three first levers, which are pivotable about a common first axis and each with a Interact intake valve and a cam for a first speed range, a second lever between the adjacent first Levers arranged and with a cam for a second speed range cooperates, and a coupling element between the first levers and the second lever to move them together in the second speed range to couple and decouple from each other in the first speed range.
  • To the coupling element runs parallel to the axes of rotation of the levers and is between a first position in which there are the first and second levers couples with each other, and a second position in which there are the first and the second lever decoupled from each other, rotatable.
  • the first outer operating lever 5 is according to Figures 1 and 2 on one standing compensation element 8 and carries a pivot axis 9 for the storage of the second inner actuating lever 6.
  • the Swivel axis 9 with respect to the compensating element 8 on the valve 2 opposite side of the first operating lever 5 is arranged.

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

Description

Die vorliegende Erfindung betrifft eine Vorrichtung zur Unterbrechung des Kraftflusses zwischen wenigstens einem Ventil und wenigstens einem Nocken einer Nockenwelle, insbesondere im Ventiltrieb einer Hubkoiben-Brennkraftmaschine, gemäß dem Oberbegriff des Patentanspruchs 1.The present invention relates to a device for interrupting the Force flow between at least one valve and at least one cam a camshaft, in particular in the valve train of a reciprocating-piston internal combustion engine, according to the preamble of claim 1.

Eine derartige Vorrichtung zeigt die DE 27 53 197 A. Das Kopplungselement zwischen dem ersten und dem zweiten Betätigungshebel ist dabei ein schwenkbar gelagertes Verriegelungsglied, das über ein Gestänge von einem ortsfest angeordneten elektromagnetischen Stellglied angesteuert ist. Daraus resultiert eine hinsichtlich des Bauraumes und des Gewichtes relativ aufwendige Konstruktion.DE 27 53 197 A shows such a device. The coupling element there is a between the first and the second actuating lever pivotably mounted locking member, which is linked by a linkage from one stationary electromagnetic actuator is controlled. This results in a relative in terms of space and weight elaborate construction.

Eine weitere Vorrichtung zur Steuerung unterschiedlicher Ventilsteuerzeiten bei einer Mehrventil-Brennkraftmaschine ist aus der Druckschrift DE 42 05 230 A1 bekannt. Die darin beschriebene Vorrichtung weist drei erste Hebel, die um eine gemeinsame erste Achse schwenkbar sind und jeweils mit einem Einlaßventil und einem Nocken für einen ersten Drehzahlbereich zusammenwirken, einen zweiten Hebel, der zwischen den benachbarten ersten Hebeln angeordnet und mit einem Nocken für einen zweiten Drehzahlbereich zusammenwirkt, und ein Kopplungselement zwischen den ersten Hebeln und dem zweiten Hebel auf, um diese im zweiten Drehzahlbereich miteinander zu koppeln und im ersten Drehzahlbereich voneinander zu entkoppeln. Dazu verläuft das Kopplungselement parallel zu den Drehachsen der Hebel und ist zwischen einer ersten Stellung, in der es die ersten und den zweiten Hebel miteinander koppelt, und einer zweiten Stellung, in der es die ersten und den zweiten Hebel voneinander entkoppelt, drehbar. Another device for controlling different valve timing in a multi-valve internal combustion engine is known from the publication DE 42 05 230 A1 known. The device described therein has three first levers, which are pivotable about a common first axis and each with a Interact intake valve and a cam for a first speed range, a second lever between the adjacent first Levers arranged and with a cam for a second speed range cooperates, and a coupling element between the first levers and the second lever to move them together in the second speed range to couple and decouple from each other in the first speed range. To the coupling element runs parallel to the axes of rotation of the levers and is between a first position in which there are the first and second levers couples with each other, and a second position in which there are the first and the second lever decoupled from each other, rotatable.

Ausgehend von diesem Stand der Technik ist es Aufgabe der vorliegenden Erfindung, eine Vorrichtung zur Unterbrechung des Kraftflusses zwischen wenigstens einem Ventil und wenigstens einem Nocken einer Nockenwelle zu konzipieren, welche besonders wenig Bauraum benötigt und daher auch bei sehr beengten Platzverhältnissen einsetzbar ist. Zudem soll diese Vorrichtung einfach sowie funktionssicher aufgebaut und kostengünstig herstellbar sein.Based on this prior art, it is the task of the present Invention, a device for interrupting the flow of force between at least one valve and at least one cam of a camshaft to conceive, which requires particularly little installation space and therefore also can be used in very confined spaces. In addition, this device simple and reliable, and inexpensive to manufacture his.

Gelöst wird die Aufgabe dadurch, dass das drehbewegliche Kopplungselement im zweiten Betätigungshebel gelagert ist und eine frei drehbare Rolle trägt, welche an dem Nocken der Nockenwelle unmittelbar anläuft. Daraus ergibt sich eine baulich besonders gedrängte Konstruktion mit niedrigen Reibungsverlusten. Zudem kann an dem zweiten Betätigungshebel eine korrespondierende Nockengleitfläche entfallen.The task is solved in that the rotatable coupling element is mounted in the second operating lever and a freely rotatable roller carries, which starts directly on the cam of the camshaft. from that the construction is particularly compact with low friction losses. In addition, a corresponding one on the second actuating lever Cam sliding surface is eliminated.

In einer Weiterbildung der vorliegenden Erfindung weist das drehbewegliche Kopplungselement im Bereich seines Eingriff mit dem ersten Betätigungshebel einen derartigen Querschnitt auf, dass es in seiner ersten Drehstellung in die Hinterschneidung einer bogenförmigen Ausnehmung im ersten Betätigungshebel eingreift und in seiner zweiten Drehstellung von dem Eingriff frei ist. Auf diese Weise kann durch eine Drehung des Kopplungselements um ca. 120 Grad zwischen der Kopplung oder Entkopplung des ersten und zweiten Betätigungshebels hin und her geschaltet werden.In a development of the present invention, the rotatable Coupling element in the area of its engagement with the first actuating lever such a cross section that in its first rotational position in the undercut of an arcuate recess in the first actuating lever engages and is free from engagement in its second rotational position is. In this way, by rotating the coupling element around approx. 120 degrees between the coupling or decoupling of the first and second actuating lever are switched back and forth.

Das Kopplungselement kann mitteis einer ersten mechanischen Dreheinrichtung in seine erste Drehstellung bewegbar sein, mittels einer zweiten mechanischen oder hydraulischen Dreheinrichtung in seine zweite Drehstellung bewegbar sein und durch eine elektromagnetische Halteeinrichtung in seiner zweiten Drehstellung gehalten werden. Damit die erste Dreheinrichtung permanent wirkt, bietet sich zum Beispiel eine Torsionsfeder an. Die zweite periodisch wirkende Dreheinrichtung kann insbesondere eine spezielle Nocke auf der Nockenwelle sein.The coupling element can by means of a first mechanical rotating device be movable into its first rotational position by means of a second mechanical or hydraulic rotating device in its second rotary position be movable and in by an electromagnetic holding device be held in its second rotational position. So that the first rotating device A torsion spring is ideal, for example. The second periodically acting rotating device can in particular be a special one Cam on the camshaft.

Somit dient die erste mechanische Dreheinrichtung zur Unterstützung der ersten Drehstellung, welche dem gekoppelten Zustand des ersten und zweiten Betätigungshebels entspricht, und dient die zweite mechanische oder hydraulische Dreheinrichtung zur Unterstützung der zweiten Drehstellung, welche dem entkoppelten Zustand des ersten und zweiten Betätigungshebeis entspricht. Dagegen dient die elektromagnetische Halteeinrichtung allein zum Aufrechterhalten der zweiten Drehstellung.The first mechanical rotating device thus serves to support the first rotational position, which is the coupled state of the first and second Actuating lever corresponds, and serves the second mechanical or hydraulic turning device to support the second turning position, which the decoupled state of the first and second actuating lever equivalent. In contrast, the electromagnetic holding device is used alone to maintain the second rotary position.

Für den Wechsel vom gekoppelten Zustand in den entkoppelten Zustand ist es erforderlich, dass die permanent wirkende Kraft der ersten mechanischen Dreheinrichtung von der periodisch oder zeitweise wirkenden Kraft der zweiten mechanischen Dreheinrichtung überwunden wird. Die elektromagnetische Halteeinrichtung wird nur dann angesteuert, wenn die aufgrund der zweiten Dreheinrichtung periodisch immer wiederkehrende zweite Drehstellung aufrechterhaiten werden soll, so dass der Kraftfluß zwischen dem Ventil und dem Nocken der Nockenwelle unterbrochen wird. Auf diese Weise kann die elektromagnetische Halteeinrichtung verhältnismäßig klein dimensioniert sein, da sie bezüglich des Kopplungselements lediglich eine Haltefunktion und nicht etwa eine Bewegungsfunktion hat.For the change from the coupled state to the decoupled state it is necessary that the permanent force of the first mechanical Rotating device from the periodically or temporarily acting force of the second mechanical rotating device is overcome. The electromagnetic Holding device is only activated if the due to second rotating device periodically recurring second rotary position should be maintained so that the flow of force between the valve and the cam of the camshaft is interrupted. That way the electromagnetic holding device is dimensioned relatively small be, since they only hold a function with respect to the coupling element and doesn't have a movement function.

Die vorliegende Erfindung wird anhand der nachfolgenden Zeichnungsfiguren näher erläutert. Es zeigen:

Figur 1
eine schematische Darstellung der erfindungsgemäßen Vorrichtung mit bestehendem Kraftfluß;
Figur 2
eine schematische Darstellung der erfindungsgemäßen Vorrichtung mit unterbrochenem Kraftfluß; und
Figur 3
eine Draufsicht der Vorrichtung aus den Figuren 1 und 2.
The present invention is explained in more detail with reference to the following drawing figures. Show it:
Figure 1
a schematic representation of the device according to the invention with existing power flow;
Figure 2
a schematic representation of the device according to the invention with interrupted power flow; and
Figure 3
2 shows a top view of the device from FIGS. 1 and 2.

Die Vorrichtung 1 dient zur Unterbrechung des Kraftflusses zwischen einem Ventil 2 und einem Nocken 3 einer Nockenwelle 4.The device 1 serves to interrupt the flow of force between one Valve 2 and a cam 3 of a camshaft 4.

Dazu umfaßt die Vorrichtung 1 einen ersten äußeren Betätigungshebel 5, der mit dem Ventil 2 zusammenwirkt, einen zweiten inneren Betätigungshebel 6, der mit dem Nocken 3 der Nockenwelle 4 zusammenwirkt, und ein drehbewegliches Kopplungselement 7, welches je nach Drehstellung den ersten und zweiten Betätigungshebel 5, 6 miteinander koppelt oder voneinander entkoppelt. Bei der Kopplung der beiden Betätigungshebel 5, 6 besteht der Kraftfiuss zwischen dem Ventil 2 und dem Nocken 3, während bei der Entkopplung der beiden Betätigungshebel 5, 6 der Kraftfluss zwischen dem Ventil 2 und dem Nocken 3 unterbrochen ist.For this purpose, the device 1 comprises a first outer actuating lever 5, which cooperates with the valve 2, a second inner operating lever 6, which cooperates with the cam 3 of the camshaft 4, and a rotatable coupling element 7, which depending on the rotational position couples first and second actuating levers 5, 6 to one another or to one another decoupled. When the two actuating levers 5, 6 are coupled the flow of force between the valve 2 and the cam 3, while at the decoupling of the two actuating levers 5, 6 the flow of force between the valve 2 and the cam 3 is interrupted.

Der erste äußere Betätigungshebel 5 ist gemäß den Figuren 1 und 2 auf einem stehenden Ausgleichselement 8 gelagert und trägt eine Schwenkachse 9 für die Lagerung des zweiten inneren Betätigungshebels 6. Dabei ist die Schwenkachse 9 bezüglich des Ausgleichselements 8 auf der dem Ventil 2 gegenüberliegenden Seite des ersten Betätigungshebels 5 angeordnet.The first outer operating lever 5 is according to Figures 1 and 2 on one standing compensation element 8 and carries a pivot axis 9 for the storage of the second inner actuating lever 6. Here is the Swivel axis 9 with respect to the compensating element 8 on the valve 2 opposite side of the first operating lever 5 is arranged.

In dem zweiten inneren Betätigungshebel 6 ist parallel zu der Schwenkachse 9 das drehbewegliche Kopplungselement 7 gelagert. Das Kopplungselement 7 weist im Bereich seiner Lagerung im ersten Betätigungshebel 5 einen kreisrunden Querschnitt und im Bereich seines Eingriffs mit dem zweiten Betätigungshebel 6 einen derartigen Querschnitt auf, dass es in der ersten Drehstellung gemäß Figur 1 in eine Hinterschneidung 10 einer bogenförmigen Ausnehmung 11 im ersten Betätigungshebel 5 eingreift und dass es in der zweiten Drehstellung gemäß Figur 2 von dem Eingriff frei ist.In the second inner operating lever 6 is parallel to the pivot axis 9, the rotatable coupling element 7 is mounted. The coupling element 7 has a in the area of its storage in the first operating lever 5 circular cross section and in the area of its engagement with the second Actuating lever 6 has a cross section such that it is in the first Rotary position according to Figure 1 in an undercut 10 of an arcuate Recess 11 engages in the first operating lever 5 and that it is in the second rotational position according to FIG. 2 is free of engagement.

Mittels einer frei drehbaren Rolle 12 liegt das in dem zweiten Betätigungshebel 6 gelagerte Kopplungselement 7 an dem wenigstens einen Nocken 3 der Nockenwelle 4 an, wobei auf der bezüglich der Schwenkachse 9 gegenüberliegenden Seite zwischen dem ersten und zweiten Betätigungshebel 5, 6 ein Federelement 13 vorgesehen ist, welches das in dem zweiten Betätigungshebel 6 gelagerte Kopplungselement 7 mit der Rolle 12 zur Anlage gegen den wenigstens einen Nocken 3 schwenkt.This lies in the second actuating lever by means of a freely rotatable roller 12 6 mounted coupling element 7 on the at least one cam 3 of the Camshaft 4 on, on the opposite with respect to the pivot axis 9 Side between the first and second operating levers 5, 6 Spring element 13 is provided, which in the second operating lever 6 mounted coupling element 7 with the roller 12 against the system which pivots at least one cam 3.

Das drehbewegliche Kopplungselement 7 ist an einem seiner freien Enden mit einer ersten mechanischen Dreheinrichtung 14 versehen, welche das Kopplungselement 7 in die erste Drehstellung bewegt. Diese erste Dreheinrichtung 14 ist als Torsionsfeder ausgebildet. Zudem steht das Kopplungselement 7 mit einer zweiten mechanischen Dreheinrichtung 14' in Verbindung, welche das Kopplungselement 7 in die zweite Drehstellung bewegt. Diese zweite mechanische Dreheinrichtung 14' ist als ein spezieller Nocken auf der Nockenwelle 4 ausgebildet. An seinem freien Ende ist das Kopplungselement 7 außerdem mit einer magnetischen Halteeinrichtung 15 verbunden, die aus einem magnetisierbaren Hebel 16 und einem Haltemagneten 17 besteht. Der magnetisierbare Hebel 16 steht mit der zweiten mechanischen Dreheinrichtung 14' in Verbindung. Ist die magnetische Halteeinrichtung 15 nun aktiviert, so kann das Kopplungselement 7 trotz nachlassender Unterstützung der zweiten mechanischen Dreheinrichtung 14' in der zweiten Drehstellung gehalten werden.The rotatable coupling element 7 is at one of its free ends provided with a first mechanical rotating device 14 which Coupling element 7 moved into the first rotational position. This first rotating device 14 is designed as a torsion spring. In addition, the coupling element 7 in connection with a second mechanical turning device 14 ', which moves the coupling element 7 into the second rotational position. This second mechanical rotating device 14 'is a special cam formed on the camshaft 4. The coupling element is at its free end 7 also connected to a magnetic holding device 15, that of a magnetizable lever 16 and a holding magnet 17 exists. The magnetizable lever 16 stands with the second mechanical Rotating device 14 'in connection. Is the magnetic holding device 15 is now activated, the coupling element 7 can in spite of decreasing Support of the second mechanical turning device 14 'in the be held in the second rotary position.

Sobald die magnetische Halteeinrichtung 15 nicht mehr aktiviert ist, kann das Kopplungselement 7 von der ersten mechanischen Dreheinrichtung 14 wieder in die erste Drehstellung bewegt werden.As soon as the magnetic holding device 15 is no longer activated, this can be done Coupling element 7 from the first mechanical rotating device 14 again be moved into the first rotary position.

Claims (4)

  1. Device for interrupting the force flow between at least one valve (2) and at least one cam (3) of a camshaft (4), particularly in the valve train of a reciprocating piston internal combustion engine with
    a first actuation lever (5) which interacts with the at least one valve (2) and is mounted on at least one static compensating element (8),
    a second actuation lever (6) rotatably mounted on the first actuation lever (5), which interacts with the at least one cam (3) of the camshaft (4), and
    a movable coupling element (7), arranged parallel to the rotation axis (9) of the second actuation lever (6), which in a first position couples the two actuation levers (5, 6) to each other and in a second position uncouples the two actuation levers (5, 6) from each other,
       characterised in that the rotatable coupling element (7) is mounted in the second actuation lever (6) and carries at least one freely rotatable roller (12), whereby the roller (12) lies on the at least one cam (3) of the camshaft (4).
  2. Device according to Claim 1, characterised in that the rotatable coupling element (7) has such a cross section in the region of its engagement with the first actuation lever (5) that in the first rotary position it engages in the undercut (10) of an arc-shaped recess (11) in the first actuation lever (5) and in the second rotary position is free from the engagement and that the coupling element (7) is permanently pretensioned into the first rotary position by means of a first mechanical rotary apparatus (14) and is movable into the second rotary position by means of a second mechanical or hydraulic rotary apparatus (14').
  3. Device according to the claims 1 and 2, characterised in that the second mechanical or hydraulic rotary apparatus (14') operates periodically and may be held in the second rotary position by means of an electromagnetic holding apparatus (15).
  4. Device according to Claim 3, characterised in that the second mechanical rotary apparatus is moved by a special cam (14') on the camshaft (4).
EP98965861A 1998-01-21 1998-12-21 Device for interrupting the power flux between at least one valve and at least one cam of a camshaft Expired - Lifetime EP1049857B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19801964A DE19801964A1 (en) 1998-01-21 1998-01-21 Mechanism to interrupt the force flow between a cam at the camshaft and a valve
DE19801964 1998-01-21
PCT/EP1998/008378 WO1999037894A1 (en) 1998-01-21 1998-12-21 Device for interrupting the power flux between at least one valve and at least one cam of a camshaft

Publications (2)

Publication Number Publication Date
EP1049857A1 EP1049857A1 (en) 2000-11-08
EP1049857B1 true EP1049857B1 (en) 2002-10-23

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EP98965861A Expired - Lifetime EP1049857B1 (en) 1998-01-21 1998-12-21 Device for interrupting the power flux between at least one valve and at least one cam of a camshaft

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US (1) US6318317B1 (en)
EP (1) EP1049857B1 (en)
JP (1) JP2002501140A (en)
DE (2) DE19801964A1 (en)
WO (1) WO1999037894A1 (en)

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Publication number Publication date
US6318317B1 (en) 2001-11-20
EP1049857A1 (en) 2000-11-08
WO1999037894A1 (en) 1999-07-29
DE19801964A1 (en) 1999-07-22
JP2002501140A (en) 2002-01-15
DE59806078D1 (en) 2002-11-28

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