EP1096115B1 - Mechanically controlled intake valve lift in an internal combustion engine - Google Patents

Mechanically controlled intake valve lift in an internal combustion engine Download PDF

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Publication number
EP1096115B1
EP1096115B1 EP99122662A EP99122662A EP1096115B1 EP 1096115 B1 EP1096115 B1 EP 1096115B1 EP 99122662 A EP99122662 A EP 99122662A EP 99122662 A EP99122662 A EP 99122662A EP 1096115 B1 EP1096115 B1 EP 1096115B1
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EP
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Prior art keywords
valve
lifting lever
interacts
combustion engine
per
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EP99122662A
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German (de)
French (fr)
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EP1096115A1 (en
Inventor
Bernhard Morrn
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STS System Tech Services GmbH
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STS System Tech Services GmbH
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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
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0021—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of rocker arm ratio
    • F01L13/0026—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of rocker arm ratio by means of an eccentric
    • 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 present invention relates to a mechanically controllable valve lift adjustment (see EP-A-780 547).
  • the present invention further relates to an internal combustion engine with a mechanical adjustable valve stroke adjustment and a method for regulating the valve strokes in internal combustion engines.
  • a vacuum occurs when the load changes from full to partial load in the cylinders due to the more fuel than needed in the cylinders is sucked. This increases the fuel consumption of the internal combustion engine, and unburned fuel may leak into the environment.
  • the object is therefore to provide a device with which the fuel consumption of an internal combustion engine can be reduced.
  • This task is accomplished by providing a mechanically controllable valve lift adjustment according to claim 1 and claim 2 and solved by a method according to claim 10.
  • valve lift adjustment according to the invention additionally a roller rocker arm, which on the one hand matches the working curve of the Lever cooperates and is driven by this and on the other hand with the valve cooperates and moves it.
  • the valve lift adjustment has a means with which the lift lever is rotatable and slidably mounted in a backdrop. This is preferably Means a role.
  • the backdrop takes up the means and thus represents its leadership, within which the means and with it the lifting lever moves under pressure and / or tension.
  • the backdrop can have any shape that is chosen by the person skilled in the art that the lifting lever preferably along a certain straight line and / or curve is movable.
  • the backdrop preferably has a substantially rectangular shape, whereby the short sides of the rectangle are preferably designed in the form of a semicircle are. This shape of the backdrop is particularly suitable for holding roles.
  • This backdrop can be horizontal or vertical or at any angle Be arranged horizontally or vertically.
  • the backdrop is also preferably in the form of a circular arc, the shape of which preferably by the geometry of the roller finger follower, in particular by the Role of the roller finger follower is defined.
  • the backdrop is it e.g. possible to implement a so-called 0-stroke, in which the respective Valve remains completely closed.
  • the shape of the backdrop is that of the respective one Valve is assigned, preferably different, whereby different Have the stroke characteristics realized per valve.
  • the valve lift adjustment according to the invention has two means that interact with the lifting lever and this in the Move the backdrop or move it to a specific location in the backdrop for a fix certain time.
  • One means is preferably an eccentric shaft, the other A means is preferably a return spring, the return spring being the lifting lever presses against the eccentric shaft and against the camshaft.
  • the eccentric shaft is preferably driven by an electric motor, a stepper motor and / or driven by a worm or gear transmission.
  • the central axis of the means that is associated with the Camshaft interacts on a horizontal plane with the central axis of the Camshaft.
  • the means that cooperate with the camshaft is a roller.
  • valve control according to the invention is suitable for valves of any kind.
  • the valves are valves of internal combustion engines, particularly preferred Intake valves for internal combustion engines.
  • Another object of the present invention therefore relates to an internal combustion engine, which has at least one valve control according to the invention.
  • At least 4, particularly preferably 6, 8 or 12, are preferably according to the invention Valve controls are available in the internal combustion engine.
  • the lifting levers are preferably rotatable mounted on a shaft, the ends of which are guided in scenes that are in the cylinder head are located.
  • the cylinder head has a special bearing cap on.
  • Another object of the present invention is a method for control of the stroke of an intake valve of an internal combustion engine using the Valve control according to the invention, in which the lifting lever corresponding to the Performance requirement for the internal combustion engine is shifted in the backdrop.
  • the lifting lever is moved in this way and for a certain time Position held that the valve or the roller rocker arm with part of the Working curve of the lifting lever is in contact, which reduces the stroke of the valve causes.
  • the lifting lever At full load, the lifting lever is moved in this way and for a certain time Position held that the valve or the roller rocker arm with part of the Working curve of the lifting lever is in contact with the maximum stroke of the valve causes.
  • the present invention has the advantage that the valve lift depending on the performance requirement can be increased or decreased.
  • Valve stroke adjustment reduces the gas exchange work in Otto engines and it This results in fuel savings of up to 10% compared to valve control according to the state of the art.
  • the mechanical control is much easier and thus cheaper to produce than z.
  • the valve control according to the invention is very robust and not maintenance-prone.
  • a lifting lever 1 is slidably mounted with the roller 2 in a link 3 (only partially shown).
  • the roller can also be a shaft on which each lifting lever is rotatably mounted.
  • the lifting lever is moved by the eccentric shaft 5 and the return spring 5 in the backdrop.
  • the direction in which the lifting lever is moved in the link is shown by line 14.
  • the person skilled in the art understands that the lifting lever 1 can also be held in a specific position within the backdrop by the two means 5.
  • the eccentric shaft is driven by a stepper motor (not shown).
  • the lifting lever 1 has a further roller 9, which is connected to the camshaft 6 cooperates, and which drives the lifting lever 1.
  • the lifting lever 1 has a working curve 4, which approximately has the shape of a parabola. This working curve is in contact with the roller 15, the is attached to the roller rocker arm 7. The roller rocker arm 7 in turn moves the valve 8.
  • the central axis 13 of the roller 9 is below the Central axis 10 of the camshaft 6, or the central axis 13 of the roller 9 is as shown in dashed lines, in the same horizontal plane as the central axis 10 of the Camshaft 6 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 mechanisch regelbare Ventilhubverstellung (siehe EP-A-780 547). Die vorliegende Erfindung betrifft ferner einen Verbrennungsmotor mit einer mechanisch regelbaren Ventilhubverstellung und ein Verfahren zum Regeln der Ventilhübe in Verbrennungsmotoren.The present invention relates to a mechanically controllable valve lift adjustment (see EP-A-780 547). The present invention further relates to an internal combustion engine with a mechanical adjustable valve stroke adjustment and a method for regulating the valve strokes in internal combustion engines.

Bei Verbrennungsmotoren tritt bei einem Lastwechsel von Voll- auf Teillast ein Unterdruck in den Zylindern auf, durch den mehr Kraftstoff als benötigt in die Zylinder gesaugt wird. Dadurch erhöht sich der Kraftstoffverbrauch des Verbrennungsmotors, und es gelangt gegebenenfalls unverbrannter Kraftstoff in die Umwelt.In internal combustion engines, a vacuum occurs when the load changes from full to partial load in the cylinders due to the more fuel than needed in the cylinders is sucked. This increases the fuel consumption of the internal combustion engine, and unburned fuel may leak into the environment.

Es besteht deshalb die Aufgabe, eine Vorrichtung zur Verfügung zu stellen, mit der der Kraftstoffverbrauch eines Verbrennungsmotors reduziert werden kann.The object is therefore to provide a device with which the fuel consumption of an internal combustion engine can be reduced.

Diese Aufgabe wird durch die Bereitstellung einer mechanisch regelbaren Ventilhubverstellung gemäß Anspruch 1 und Anspruch 2 und durch ein Verfahren gemäß Anspruch 10 gelöst.This task is accomplished by providing a mechanically controllable valve lift adjustment according to claim 1 and claim 2 and solved by a method according to claim 10.

In der Ausführungsform gemäß Anspruch 2 weist die erfindungsgemäße Ventilhubverstellung zusätzlich einen Rollenschlepphebel auf, der einerseits mit der Arbeitskurve des Hubhebels zusammenwirkt und von diesem angetrieben wird und andererseits mit dem Ventil zusammenwirkt und dieses bewegt.In the embodiment according to claim 2, the valve lift adjustment according to the invention additionally a roller rocker arm, which on the one hand matches the working curve of the Lever cooperates and is driven by this and on the other hand with the valve cooperates and moves it.

Erfindungsgemäß weist die Ventilhubverstellung ein Mittel auf, mit dem der Hubhebel drehbar und in einer Kulisse verschieblich gelagert ist. Vorzugsweise ist dieses Mittel eine Rolle.According to the invention, the valve lift adjustment has a means with which the lift lever is rotatable and slidably mounted in a backdrop. This is preferably Means a role.

Die Kulisse nimmt das Mittel auf und stellt somit dessen Führung dar, innerhalb derer sich das Mittel und mit ihm der Hubhebel unter Druck und/oder Zug verschiebt. Die Kulisse kann eine beliebige Form aufweisen, die vom Fachmann so gewählt wird, daß der Hubhebel vorzugsweise entlang einer bestimmten Geraden und/oder Kurve verschiebbar ist.The backdrop takes up the means and thus represents its leadership, within which the means and with it the lifting lever moves under pressure and / or tension. The The backdrop can have any shape that is chosen by the person skilled in the art that the lifting lever preferably along a certain straight line and / or curve is movable.

Vorzugsweise hat die Kulisse jedoch eine im wesentlichen rechteckige Form, wobei die kurzen Seiten des Rechtecks vorzugsweise in Form eines Halbkreises gestaltet sind. Diese Form der Kulisse eignet sich insbesondere zur Aufnahme von Rollen. Diese Kulisse kann horizontal oder vertikal oder in einem beliebigen Winkel zur Horizontalen bzw. Vertikalen angeordnet sein.However, the backdrop preferably has a substantially rectangular shape, whereby the short sides of the rectangle are preferably designed in the form of a semicircle are. This shape of the backdrop is particularly suitable for holding roles. This backdrop can be horizontal or vertical or at any angle Be arranged horizontally or vertically.

Ebenfalls bevorzugt hat die Kulisse die Form eines Kreisbogens, dessen Form vorzugsweise durch die Geometrie des Rollenschlepphebels, insbesondere durch die Rolle des Rollenschlepphebels definiert ist. Durch diese Gestaltung der Kulisse ist es z.B. möglich, einen sogenannten 0-Hub zu realisieren, bei dem das jeweilige Ventil völlig geschlossen bleibt.The backdrop is also preferably in the form of a circular arc, the shape of which preferably by the geometry of the roller finger follower, in particular by the Role of the roller finger follower is defined. Through this design the backdrop is it e.g. possible to implement a so-called 0-stroke, in which the respective Valve remains completely closed.

Bei zwei Einlaßventilen pro Zylinder ist die Form der Kulisse, die dem jeweiligen Ventil zugeordnet ist, vorzugsweise unterschiedlich, wodurch sich unterschiedliche Hubcharakteristika pro Ventil realisieren lassen.With two intake valves per cylinder, the shape of the backdrop is that of the respective one Valve is assigned, preferably different, whereby different Have the stroke characteristics realized per valve.

In einer bevorzugten Ausführungsform weist die erfindungsgemäße Ventilhubverstellung zwei Mittel auf, die mit dem Hubhebel zusammenwirken und diesen in der Kulisse verschieben bzw. diesen an einer bestimmten Stelle in der Kulisse für eine gewisse Zeit fixieren. Ein Mittel ist vorzugsweise eine Exzenterwelle, das andere Mittel ist vorzugsweise eine Rückstellfeder, wobei die Rückstellfeder den Hubhebel gegen die Exzenterwelle und gegen die Nockenwelle drückt. Bei mehreren Exzenterwellen kann deren Form jeweils unterschiedlich sein, um unterschiedliche Hubcharakteristika pro Ventil zu erreichen.In a preferred embodiment, the valve lift adjustment according to the invention has two means that interact with the lifting lever and this in the Move the backdrop or move it to a specific location in the backdrop for a fix certain time. One means is preferably an eccentric shaft, the other A means is preferably a return spring, the return spring being the lifting lever presses against the eccentric shaft and against the camshaft. With several Eccentric shafts can have different shapes, different ones To achieve stroke characteristics per valve.

Der Fachmann versteht, daß die Verschiebung des Hubhebels in der Kulisse auch z.B. mit zwei Rückstellfedern oder mit zwei Exzenterwellen oder jedem beliebigen Mittelpaar erzielt werden kann, mit dem gegenläufige Kräfte auf den Hubhelhebel ausgeübt werden können, die den Hubhebel fixieren bzw. innerhalb der Kulisse verschieben.The skilled person understands that the displacement of the lifting lever in the backdrop as well e.g. with two return springs or with two eccentric shafts or any Middle pair can be achieved with the opposite forces on the lifting lever can be exercised, which fix the lifting lever or within the backdrop move.

Vorzugsweise wird die Exzenterwelle durch einen Elektromotor, einen Schrittmotor und/oder durch ein Schnecken- oder Zahnradgetriebe angetrieben. In einer vorteilhaften Ausführungsform befindet sich die Mittelachse des Mittels, das mit der Nockenwelle zusammenwirkt, auf einer horizontalen Ebene mit der Mittelachse der Nockenwelle.The eccentric shaft is preferably driven by an electric motor, a stepper motor and / or driven by a worm or gear transmission. In an advantageous Embodiment is the central axis of the means that is associated with the Camshaft interacts on a horizontal plane with the central axis of the Camshaft.

In einer anderen vorteilhaften Ausführungsform befindet sich die Mittelachse des Mittels, das mit der Nockenwelle zusammenwirkt, unterhalb der Mittelachse der Nockenwelle.In another advantageous embodiment, the central axis of the By means of which cooperates with the camshaft, below the central axis of the Camshaft.

Vorzugsweise ist das Mittel, das mit der Nockenwelle zusammenwirkt, eine Rolle.Preferably, the means that cooperate with the camshaft is a roller.

Die erfindungsgemäße Ventilsteuerung eignet sich für Ventile beliebiger Art. Vorzugsweise sind die Ventile jedoch Ventile von Verbrennungsmotoren, besonders bevorzugt Einlaßventile von Verbrennungsmotoren.The valve control according to the invention is suitable for valves of any kind. Preferably however, the valves are valves of internal combustion engines, particularly preferred Intake valves for internal combustion engines.

Ein weiterer Gegenstand der vorliegenden Erfindung betrifft deshalb einen Verbrennungsmotor, der mindestens eine erfindungsgemäße Ventilsteuerung aufweist.Another object of the present invention therefore relates to an internal combustion engine, which has at least one valve control according to the invention.

Vorzugsweise sind mindestens 4, besonders bevorzugt 6, 8 oder 12 erfindungsgemäße Ventilsteuerungen in dem Verbrennungsmotor vorhanden.At least 4, particularly preferably 6, 8 or 12, are preferably according to the invention Valve controls are available in the internal combustion engine.

In einem solchen Verbrennungsmotor sind die Hubhebel vorzugsweise drehbar auf einer Welle gelagert, deren Enden in Kulissen geführt wird, die sich in dem Zylinderkopf befinden. In diesem Fall weist der Zylinderkopf einen speziellen Lagerdeckel auf.In such an internal combustion engine, the lifting levers are preferably rotatable mounted on a shaft, the ends of which are guided in scenes that are in the cylinder head are located. In this case, the cylinder head has a special bearing cap on.

Ein weiterer Gegenstand der vorliegenden Erfindung ist ein Verfahren zur Steuerung des Hubes eines Einlaßventiles eines Verbrennungsmotors unter Verwendung der erfindungsgemäßen Ventilsteuerung, bei dem der Hubhebel entsprechend der Leistungsanforderung an den Verbrennungsmotor in der Kulisse verschoben wird.Another object of the present invention is a method for control of the stroke of an intake valve of an internal combustion engine using the Valve control according to the invention, in which the lifting lever corresponding to the Performance requirement for the internal combustion engine is shifted in the backdrop.

Bei Teillast wird der Hubhebel so verschoben und für eine gewisse Zeit in dieser Stellung gehalten, daß das Ventil oder der Rollenschlepphebel mit einem Teil der Arbeitskurve des Hubhebels in Kontakt steht, der einen reduzierten Hub des Ventils bewirkt.At partial load, the lifting lever is moved in this way and for a certain time Position held that the valve or the roller rocker arm with part of the Working curve of the lifting lever is in contact, which reduces the stroke of the valve causes.

Bei Vollast wird der Hubhebel so verschoben und für eine gewisse Zeit in dieser Stellung gehalten, daß das Ventil oder der Rollenschlepphebel mit einem Teil der Arbeitskurve des Hubhebels in Kontakt steht, der den maximalen Hub des Ventils bewirkt.At full load, the lifting lever is moved in this way and for a certain time Position held that the valve or the roller rocker arm with part of the Working curve of the lifting lever is in contact with the maximum stroke of the valve causes.

Die vorliegende Erfindung hat den Vorteil, daß der Ventilhub je nach Leistungsanforderung vergrößert oder verringert werden kann. Durch die erfindungsgemäße Ventilhubverstellung wird die Ladungswechselarbeit in Otto-Motoren reduziert und es ergeben sich Kraftstoffeinsparungen bis zu 10% im Vergleich zur Ventilsteuerung gemäß dem Stand der Technik. Die mechanische Steuerung ist wesentlich einfacher und damit kostengünstiger herzustellen als z. B. elektronische Steuerungen des Ventilhubes. Die erfindungsgemäße Ventilsteuerung ist sehr robust und nicht wartungsanfällig.The present invention has the advantage that the valve lift depending on the performance requirement can be increased or decreased. By the invention Valve stroke adjustment reduces the gas exchange work in Otto engines and it This results in fuel savings of up to 10% compared to valve control according to the state of the art. The mechanical control is much easier and thus cheaper to produce than z. B. electronic controls of Valve stroke. The valve control according to the invention is very robust and not maintenance-prone.

Im folgenden wird die Erfindung anhand der Figur 1 erläutert. Diese Erläuterungen sind lediglich beispielhaft und schränken den allgemeinen Erfindungsgedanken nicht ein.The invention is explained below with reference to FIG. 1. These explanations are merely exemplary and do not limit the general idea of the invention on.

In Figur 1 ist die erfindungsgemäße Ventilsteuerung dargestellt. Ein Hubhebel 1 ist mit der Rolle 2 in einer Kulisse 3 (nur teilweise dargestellt) verschieblich gelagert. Der Fachmann erkennt, daß die Rolle auch eine Welle sein kann, auf der jeder Hubhebel drehbar gelagert ist. Der Hubhebel wird durch die Exzenterwelle 5 und die Rückstellfeder 5 in der Kulisse verschoben. Die Richtung, in der der Hubhebel in der Kulisse verschoben wird, ist durch die Linie 14 dargestellt. Der Fachmann versteht, daß der Hubhebel 1 durch die beiden Mittel 5 auch in einer bestimmten Position innerhalb der Kulisse gehalten werden kann. Die Exzenterwelle wird durch einen Schrittmotor (nicht dargestellt) angetrieben.The valve control according to the invention is shown in FIG . A lifting lever 1 is slidably mounted with the roller 2 in a link 3 (only partially shown). The person skilled in the art recognizes that the roller can also be a shaft on which each lifting lever is rotatably mounted. The lifting lever is moved by the eccentric shaft 5 and the return spring 5 in the backdrop. The direction in which the lifting lever is moved in the link is shown by line 14. The person skilled in the art understands that the lifting lever 1 can also be held in a specific position within the backdrop by the two means 5. The eccentric shaft is driven by a stepper motor (not shown).

Desweiteren verfügt der Hubhebel 1 über eine weitere Rolle 9, die mit der Nockenwelle 6 zusammenwirkt, und die den Hubhebel 1 antreibt.Furthermore, the lifting lever 1 has a further roller 9, which is connected to the camshaft 6 cooperates, and which drives the lifting lever 1.

Im unteren Teil weist der Hubhebel 1 eine Arbeitskurve 4 auf, die näherungsweise die Form einer Parabel hat. Diese Arbeitskurve steht in Kontakt mit der Rolle 15, die an dem Rollenschlepphebel 7 angebracht ist. Der Rollenschlepphebel 7 wiederum bewegt das Ventil 8.In the lower part, the lifting lever 1 has a working curve 4, which approximately has the shape of a parabola. This working curve is in contact with the roller 15, the is attached to the roller rocker arm 7. The roller rocker arm 7 in turn moves the valve 8.

Je nach Platzverhältnissen befindet sich die Mittelachse 13 der Rolle 9 unterhalb der Mittelachse 10 der Nockenwelle 6, oder die Mittelachse 13 der Rolle 9 ist, wie gestrichelt dargestellt, in derselben horizontalen Ebene wie die Mittelachse 10 der Nockenwelle 6 angeordnet.Depending on the space available, the central axis 13 of the roller 9 is below the Central axis 10 of the camshaft 6, or the central axis 13 of the roller 9 is as shown in dashed lines, in the same horizontal plane as the central axis 10 of the Camshaft 6 arranged.

Wird z. B. ein Verbrennungsmotor in Teillast betrieben, wird der Hubhebel 1 in der Kulisse 3 so verschoben, daß der Rollenschlepphebel 7 mit dem linken Teil 11 der Arbeitskurve 4 zusammenwirkt, so daß der Hub des Ventils 8 reduziert ist. Bei Volllast hingegen wird der Hubhebel 1 in der Kulisse 3 so verschoben, daß der rechte Teil 12 der Arbeitskurve 4 mit dem Rollenschlepphebel 7 in Kontakt steht, so daß der Hub des Ventils 8 maximal ist.Is z. B. an internal combustion engine operated in partial load, the lifting lever 1 is in the Backdrop 3 moved so that the roller rocker arm 7 with the left part 11 of the Working curve 4 interacts so that the stroke of the valve 8 is reduced. At full load however, the lifting lever 1 is shifted in the setting 3 so that the right Part 12 of the working curve 4 is in contact with the roller rocker arm 7 so that the Stroke of the valve 8 is maximum.

Claims (12)

  1. Mechanically regulated valve stroke adjuster having:
    A lifting lever (1) displaying
    a first means (2) by which the lifting lever (1) is mounted in rotating fashion and in sliding fashion in a guide block (3),
    a second means (9) which interacts with a camshaft (6) that drives the lifting lever (1), and
    a working curve (4),
    At least one third means (5) which interacts with the lifting lever (1) and displaces it in the guide block,
    A camshaft (6) which interacts with the second means (9) of the lifting lever (1) and drives it,
    A valve (8) which interacts with the working curve (4) of the lifting lever (1) and is moved by it.
  2. Mechanically regulated valve stroke adjuster having:
    A lifting lever (1) displaying
    a first means (2) by which the lifting lever (1) is mounted in rotating fashion and in sliding fashion in a guide block (3),
    a second means (9) which interacts with a camshaft (6) that drives the lifting lever (1), and
    a working curve (4),
    At least one third means (5) which interacts with the lifting lever (1) and displaces it in the guide block,
    A camshaft (6) which interacts with the second means (9) of the lifting lever (1) and drives it in pure rotatory fashion,
    A cam follower with roller (7) which interacts with the working curve (4) of the lifting lever (1) and is driven by the latter,
    A valve (8) which interacts with the cam follower with roller (7) and is moved by it.
  3. Valve stroke adjuster as per Claim 1 or 2, characterised in that it displays two third means (5), where one means is an eccentric shaft and the other means is preferably a return spring.
  4. Valve stroke adjuster as per Claim 3, characterised in that the eccentric shaft is driven by an electric motor, stepping motor or a worm or toothed-wheel gear.
  5. Valve operating mechanism as per one of Claims 1 to 4, characterised in that the centre axis (13) of the second means (9) is located on the same horizontal plane as the centre axis (10) of the camshaft (6).
  6. Valve operating mechanism as per one of Claims 1 to 4, characterised in that the centre axis (13) of the second means (9) is located below the centre axis (10) of the camshaft (6).
  7. Valve operating mechanism as per one of Claims 1 to 6, characterised in that the first means (2) and/or the second means (9) is a roller.
  8. Valve operating mechanism as per one of Claims 1 to 7, characterised in that the valve is an intake valve of an internal-combustion engine.
  9. Internal-combustion engine, characterised in that it displays at least 4, preferably 6, 8 or 12, valve operating mechanisms according to one of Claims 1 to 8.
  10. Method for controlling the stroke of an intake valve of an internal-combustion engine using a valve operating mechanism according to one of Claims 1 to 8, characterised in that the lifting lever (1) is displaced in the guide block (3) in accordance with the power demand on the internal-combustion engine.
  11. Method as per Claim 10, characterised in that, when operating at part load of the internal-combustion engine, the lifting lever (1) is displaced in such a way that the first part (11) of the working curve (4) interacts with the valve.
  12. Method as per Claim 10, characterised in that, when operating at full load of the internal-combustion engine, the lifting lever (1) is displaced in such a way that the second part (12) of the working curve (4) interacts with the valve or the cam follower with roller (7).
EP99122662A 1999-10-29 1999-11-15 Mechanically controlled intake valve lift in an internal combustion engine Expired - Lifetime EP1096115B1 (en)

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EP99122662A EP1096115B1 (en) 1999-10-29 1999-11-15 Mechanically controlled intake valve lift in an internal combustion engine

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EP99121609 1999-10-29
EP99121609 1999-10-29
EP99122662A EP1096115B1 (en) 1999-10-29 1999-11-15 Mechanically controlled intake valve lift in an internal combustion engine

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6907852B2 (en) 2001-05-12 2005-06-21 Bayerische Motoren Werke Ag Valve operating device for variable stroke adjustment of a charge exchange valve of an internal combustion engine

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE50103100D1 (en) 2001-05-03 2004-09-09 Sts System Technology Services Mechanical regulation of the stroke adjustment of the intake valve of an internal combustion engine
DE10140635B4 (en) * 2001-08-13 2010-12-02 Entec Consulting Gmbh Device for variable valve lift adjustment of gas exchange valves of an internal combustion engine
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