EP0686756B1 - Valve drive with variable and independent control of the valve opening angle and of the valve lift - Google Patents

Valve drive with variable and independent control of the valve opening angle and of the valve lift Download PDF

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Publication number
EP0686756B1
EP0686756B1 EP95106520A EP95106520A EP0686756B1 EP 0686756 B1 EP0686756 B1 EP 0686756B1 EP 95106520 A EP95106520 A EP 95106520A EP 95106520 A EP95106520 A EP 95106520A EP 0686756 B1 EP0686756 B1 EP 0686756B1
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EP
European Patent Office
Prior art keywords
valve
control
lever
variable
drive according
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.)
Expired - Lifetime
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EP95106520A
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German (de)
French (fr)
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EP0686756A1 (en
Inventor
Gert Fischer
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Bayerische Motoren Werke AG
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Bayerische Motoren Werke AG
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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
    • F01L13/0015—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
    • F01L13/0063—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 cam contact point by displacing an intermediate lever or wedge-shaped intermediate element, e.g. Tourtelot
    • 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
    • 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
    • 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
    • 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
    • F01L2303/00—Manufacturing of components used in valve arrangements
    • F01L2303/01—Tools for producing, mounting or adjusting, e.g. some part of the distribution
    • 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
    • F01L2800/00—Methods of operation using a variable valve timing mechanism
    • F01L2800/13—Throttleless
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F1/42—Shape or arrangement of intake or exhaust channels in cylinder heads
    • F02F1/4214—Shape or arrangement of intake or exhaust channels in cylinder heads specially adapted for four or more valves per cylinder
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F2001/244—Arrangement of valve stems in cylinder heads
    • F02F2001/245—Arrangement of valve stems in cylinder heads the valve stems being orientated at an angle with the cylinder axis

Definitions

  • the invention is based on the preamble of claim 1 WO-A-94/13935 (publication date 06/23/94).
  • the subject of this document is a valve train with a control device for variable change in the opening and closing of a globe valve at essentially constant valve lift.
  • a control cam acts in this control device a camshaft, for example, via a roller serving as an intermediate element and a valve lever on the lift valve.
  • To change the valve opening period is the roller along a path concentric to the camshaft axis in the Movable valve lever.
  • the invention is based, this known valve train for a task to further develop effective load control.
  • variable stroke control with the variable control of the valve opening angle in the known valve train is a targeted load control Internal combustion engine possible.
  • the stroke of the gas exchange valve according to the respective load can be varied and that over the entire valve stroke, whereby both controls from each other be brought into effect independently.
  • variable stroke control a valve lever with variable translation selected.
  • a variable valve lift control using a variable valve lever ratio known per se from US-A 3 166 057, but not more variable with the circumstance Valve opening angle, so that an additional speed-dependent influence in contrast to load control via early or late opening and closing angles is not given to the invention.
  • a control cam 2 of a camshaft 3 actuates a gas exchange valve 4 via a valve lever 5.
  • the valve lever is a rocker arm 6, the On the control cam side, one concentrically arranged to the axis 7 of the camshaft 3 Guide 8 has.
  • an intermediate element designed as a roller 9 10 via a control device 11 according to FIG the arrow directions A and B relative to the rotating control cam 2 the same and oppositely controlled.
  • the positively controlled roller 9 is above crank arms 12, for example, with a crank mechanism (not shown) of the control device 11 in drive connection, the crank mechanism being synchronous with the camshaft 3 turns.
  • Purpose of relative to the rotating control cam 2 according to the arrows A and B relocatable roller 9 is the action of the control cam 2 on the Rocker arm 6 for actuating the gas exchange valve 4 early or late shift and thus different valve opening angles or different lengths To achieve valve opening periods. (Further details in the PCT / EP mentioned at the beginning 93/03451.)
  • This control device 11 for variable valve opening angles or connected thereto for variable valve spread is combined according to the invention with a variable Stroke control 13 for the gas exchange valve 4.
  • variable stroke control because of its simple construction 13 comprises a valve lever 5 with variable translation.
  • a compact design with a low overall height results in a rocker arm 6 designed valve lever 5, the rocker arm 6 between its two end regions an arcuate slideway 14 for a displaceable via a rocker 15 Has sliding block 16.
  • the rocker 15 is in a cylinder head, not shown the internal combustion engine, preferably slightly below the camshaft the axis of the camshaft is pivotally mounted.
  • rocker 15 is with the associated displacement the sliding block 10 along the arcuate slideway 14 the translation of the rocker arm 6 changed. With this changeable translation you get a changeable stroke of the gas exchange valve 4.
  • This changeable valve stroke of the Gas exchange valves 4 are used for the targeted load control of an internal combustion engine. Independent of the control device 11 for variable valve opening angles or separately effective variable stroke control 13 can over each selected valve opening angle of the stroke of the gas exchange valve 4 in principle a zero stroke up to a maximum stroke can be varied.
  • the rocker arm 6 can in its valve-side end region with a, not shown, automatic valve lash adjuster can be combined.
  • the combination according to the invention can also be used to achieve that with a chosen translation of the rocker arm 6 and thus at a constant Stroke of the gas exchange valve 4 valve opening angles via the control device 11 can be varied.
  • the rocker 15 is driven in a map-controlled manner (Not shown).
  • This configuration advantageously enables the variable valve opening angle control 11 in combination with the variable Stroke control 13 takes over the function of a load control member and thus one Load control element usually designed as a throttle valve can be omitted.
  • FIG. 2 It can be seen from FIG. 2 that for several gas exchange valves 4 of the same type a rocker 15 acting together can be used. In the shown in Figure 2 Arrangement of the similar gas exchange valves 4 can either one Cylinder of an internal combustion engine or two adjacent cylinders of an internal combustion engine belong to.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Description

Die Erfindung geht gemäß dem Oberbegriff des Patentanspruches 1 von der WO-A-94/13935 (Veröffentlichungsdatum 23.06.94) aus.The invention is based on the preamble of claim 1 WO-A-94/13935 (publication date 06/23/94).

Gegenstand dieses Dokumentes ist ein Ventiltrieb mit einer Steuervorrichtung zur variablen Änderung der Öffnung und Schließung eines Hubventiles bei im wesentlichen konstantem Ventilhub. Bei dieser Steuervorrichtung wirkt ein Steuernocken einer Nockenwelle beispielsweise über eine als Zwischenelement dienende Rolle und einem Ventilhebel auf das Hubventil ein. Zur Änderung der Ventilöffnungsperiode ist die Rolle längs einer zur Nockenwellenachse konzentrischen Bahn im Ventilhebel verlagerbar.The subject of this document is a valve train with a control device for variable change in the opening and closing of a globe valve at essentially constant valve lift. A control cam acts in this control device a camshaft, for example, via a roller serving as an intermediate element and a valve lever on the lift valve. To change the valve opening period is the roller along a path concentric to the camshaft axis in the Movable valve lever.

Diese Verlagerung erfolgt jedoch nicht, wie z.B. aus der CH-PS 390 617 bekannt, bedarfsweise last- und drehzahlabhängig statisch, wobei Öffnungs- und Schließzeitpunkt bei konstant bleibendem Abstand gleichzeitig verstellt werden und keine Änderung der Ventilerhebungskurve gegeben ist. Weiter erfolgt die Verlagerung ebenfalls nicht in der aus der DE-A 42 20 816 bekannten Weise, bei der die zur Nockenwellen-Achse in einem Schlepp- oder Kipphebel konzentrisch verlagerbare Rolle mittels statischer Verstellung der Änderung des Ventilhebel-Übersetzungsverhältnisses zur Änderung des Ventilhubes dient, wobei die zwischen Öffnungs- und Schließzeitpunkt ebenfalls konstant bleibende Steuerzeit lediglich ventilhubabhängig gegen früh oder spät verschoben wird.However, this shift does not take place, e.g. known from CH-PS 390 617, if necessary, static depending on load and speed, with opening and closing times at a constant distance can be adjusted at the same time and none There is a change in the valve lift curve. The relocation continues also not in the manner known from DE-A 42 20 816, in which the for Camshaft axis concentrically displaceable in a rocker arm or rocker arm Roll by means of static adjustment of the change in the valve lever transmission ratio serves to change the valve stroke, the between opening and closing time also constant control time only dependent on the valve lift is moved towards early or late.

Demgegenüber wird bei dem von der FR-A 2 500 528 ausgehenden Anmeldegegenstand der eingangs genannten WO-A-94/13935 vorgeschlagen, daß das Zwischenelement - z.B. eine Rolle - über einen zur Achse der Nockenwelle im wesentlichen konzentrischen Kreisbogenabschnitt in/an einem Übertragungsglied - z.B. ein Ventilhebel - beweglich geführt angeordnet ist und mit einer mit der Nockenwelle ständig synchron drehenden und relativ drehwinkelverstellbaren Welle einer Steuervorrichtung derart in Antriebsverbindung steht, daß bei jedem Ventilhub ein die Ventilöffnungsphase bestimmender Eingriff der Kontaktbahn beispielsweise der Rolle mit dem Öffnungs- und Schließflanken des drehenden Steuernockens durch eine relativ zur Drehrichtung des Steuernockens gleich- oder gegensinnig zwangsgesteuerte Bewegung der beipielsweisen Rolle erzielt ist.In contrast, the subject of the application originating from FR-A 2 500 528 of the aforementioned WO-A-94/13935 suggested that the Intermediate element - e.g. a role - about one to the axis of the camshaft essentially concentric circular arc section in / on a transmission link - e.g. a valve lever - is movably guided and with one with the Camshaft constantly rotating synchronously and relatively rotatable angle Shaft of a control device is in drive connection such that each Valve lift, for example, an engagement of the contact track which determines the valve opening phase the roller with the opening and closing flanks of the rotating Control cam by the same or relative to the direction of rotation of the control cam opposite positively controlled movement of the example role is achieved.

Demnach ist in einer ersten Drehwinkelzuordnung der ständig synchron zur Nockenwelle drehenden Welle der Steuervorrichtung die übertragungsgliedseitig angeordnete Rolle relativ zum einwirkenden Steuernocken mit dessen Drehrichtung gesteuert mitbewegt und in einer zweiten, dazu entgegengesetzten Drehwinkelzuordnung ist die Rolle relativ zum einwirkenden Steuemocken entgegen dessen Drehrichtung gesteuert bewegt. Mit der bei jedem Ventilhub relativ zum Steuernocken gleichsinnig gesteuert angetriebenen und damit dynamisch gesteuerten Rolle im Übertragungsglied ergibt sich bei im wesentlichen konstantem Ventilhub damit ein großer Ventilöffnungswinkel bzw. eine lange Ventilöffnungsperiode. Die demgegenüber bei jedem Ventilhub relativ zum Steuernocken gegensinnig gesteuert angetriebene und damit dynamisch gesteuerte Rolle im Übertragungsglied bewirkt bei im wesentlichen konstantem Ventilhub einen relativ kleinen Ventilöffnungswinkel bzw. eine kurze Ventilöffnungsperiode.Accordingly, in a first rotation angle assignment, it is constantly synchronized with Camshaft rotating shaft of the control device on the transmission member side arranged roller relative to the acting control cam with its direction of rotation controlled controlled and in a second, opposite rotation angle assignment the role is opposed relative to the acting control cam whose direction of rotation is controlled. With the relative to each valve stroke Control cams driven in the same direction and thus dynamically controlled Role in the transmission link is given at a substantially constant Valve stroke thus a large valve opening angle or a long valve opening period. In contrast, with each valve stroke in opposite directions to the control cam controlled driven and thus dynamically controlled role in the transmission link causes a relatively small one with a substantially constant valve lift Valve opening angle or a short valve opening period.

Der Erfindung liegt die Aufgabe zugrunde, diesen bekannten Ventiltrieb für eine wirksame Laststeuerung weiterzubilden.The invention is based, this known valve train for a task to further develop effective load control.

Diese Aufgabe ist mit dem Patentanspruch 1 gelöst. Durch die erfinderische Kombination einer variablen Hubsteuerung mit der variabalen Steuerung der Ventilöffnungswinkel in dem bekannten Ventiltrieb ist eine gezielte Laststeuerung der Brennkraftmaschine möglich. Insbesondere kann bei konstant gehaltenem Ventilöffnungswinkel der Hub des Gaswechselventils entsprechend der jeweiligen Last variiert werden und zwar über dem gesamten Ventilhub, wobei beide Steuerungen voneinander unabhängig zur Wirkung gebracht werden. Dies ermöglicht es in vorteilhafter Weise, daß die variable Ventilöffnungswinkel-Steuerung in Kombination mit der variablen Hubsteuerung die Funktion eines Laststeuerorgans übernimmt und damit ein beispielsweise als Drosselklappe gestaltetes gesondertes Laststeuerorgan sich erübrigt.This object is achieved with patent claim 1. Through the inventive combination a variable stroke control with the variable control of the valve opening angle in the known valve train is a targeted load control Internal combustion engine possible. In particular, when the valve opening angle is kept constant the stroke of the gas exchange valve according to the respective load can be varied and that over the entire valve stroke, whereby both controls from each other be brought into effect independently. This makes it more advantageous Way that the variable valve opening angle control in combination with the variable stroke control takes over the function of a load control device and thus a separate load control element designed, for example, as a throttle valve superfluous.

In einer konstruktiv besonders bevorzugten Ausgestaltung wird als variable Hubsteuerung ein Ventilhebel mit veränderbarer Übersetzung gewählt. Dies ergibt eine kompakte Bauweise bei niedrigster Bauhöhe der kombinierten Vorrichtung. Zwar ist eine variable Ventilhubsteuerung mittels veränderbarer Ventilhebel-Übersetzung per se aus der US-A 3 166 057 bekannt, jedoch mit dem Umstand nicht variabler Ventilöffnungswinkel, so daß eine zusätzliche drehzahlabhängige Beeinflussung der Laststeuerung über frühe oder späte Öffnungs- und Schließwinkel im Gegensatz zur Erfindung nicht gegeben ist.In a structurally particularly preferred embodiment is used as a variable stroke control a valve lever with variable translation selected. This gives one compact design with the lowest overall height of the combined device. Though is a variable valve lift control using a variable valve lever ratio known per se from US-A 3 166 057, but not more variable with the circumstance Valve opening angle, so that an additional speed-dependent influence in contrast to load control via early or late opening and closing angles is not given to the invention.

Weitere vorteilhafte Ausgestaltungen der Erfindung sind in zusätzlichen Unteransprüchen beschrieben. Die Erfindung ist anhand eines in der Zeichnung schematisch dargestellten Ausführungsbeispiels beschrieben. Es zeigt

Figur 1
den erfindungsgemäßen Ventiltrieb in Seitenansicht, und
Figur 2
den erfindungsgemäßen Ventiltrieb in perspektivischer Ansicht für zwei gleichartige Gaswechselventile einer nicht näher dargestellten Brennkraftmaschine.
Further advantageous embodiments of the invention are described in additional subclaims. The invention is described with reference to an embodiment shown schematically in the drawing. It shows
Figure 1
the valve train according to the invention in side view, and
Figure 2
the valve train according to the invention in a perspective view for two similar gas exchange valves of an internal combustion engine, not shown.

Bei einem Ventiltrieb 1 betätigt ein Steuernocken 2 einer Nockenwelle 3 ein Gaswechselventil 4 über einen Ventilhebel 5. Der Ventilhebel ist ein Kipphebel 6, der steuernockenseitig eine zur Achse 7 der Nockenwelle 3 konzentrisch angeordnete Führung 8 aufweist. Längs der Führung 8 ist ein als Rolle 9 gestaltetes Zwischenelement 10 über eine nicht näher dargestellte Steuereinrichtung 11 gemäß den Pfeilrichtungen A und B relativ zum drehenden Steuemocken 2 gleich- und gegensinnig zwangsgesteuert. Die zwangsgesteuerte Rolle 9 steht über Kurbelarme 12 beispielsweise mit einem nicht gezeigten Kurbeltrieb der Steuereinrichtung 11 in Antriebsverbindung, wobei der Kurbeltrieb mit der Nockenwelle 3 synchron dreht. Zweck der relativ zum drehenden Steuernocken 2 gemäß den Pfeilen A und B verlagerbaren Rolle 9 ist es, die Einwirkung des Steuernockens 2 auf den Kipphebel 6 zur Betätigung des Gaswechselventils 4 nach früh oder nach spät zu verlagern und damit unterschiedliche Ventilöffnungswinkel bzw. verschieden lange Ventilöffnungsperioden zu erzielen. (Näheres in der eingangs erwähnten PCT/EP 93/03451.)In the case of a valve train 1, a control cam 2 of a camshaft 3 actuates a gas exchange valve 4 via a valve lever 5. The valve lever is a rocker arm 6, the On the control cam side, one concentrically arranged to the axis 7 of the camshaft 3 Guide 8 has. Along the guide 8 is an intermediate element designed as a roller 9 10 via a control device 11 according to FIG the arrow directions A and B relative to the rotating control cam 2 the same and oppositely controlled. The positively controlled roller 9 is above crank arms 12, for example, with a crank mechanism (not shown) of the control device 11 in drive connection, the crank mechanism being synchronous with the camshaft 3 turns. Purpose of relative to the rotating control cam 2 according to the arrows A and B relocatable roller 9 is the action of the control cam 2 on the Rocker arm 6 for actuating the gas exchange valve 4 early or late shift and thus different valve opening angles or different lengths To achieve valve opening periods. (Further details in the PCT / EP mentioned at the beginning 93/03451.)

Diese Steuereinrichtung 11 für variable Ventilöffnungswinkel bzw. damit verbunden für variable Ventilspreizung wird erfindungsgemäß kombiniert mit einer variablen Hubsteuerung 13 für das Gaswechselventil 4.This control device 11 for variable valve opening angles or connected thereto for variable valve spread is combined according to the invention with a variable Stroke control 13 for the gas exchange valve 4.

Eine wegen einfachen Aufbaues bevorzugte Ausgestaltung der variablen Hubsteuerung 13 umfaßt einen Ventilhebel 5 mit veränderbarer Übersetzung.A preferred embodiment of the variable stroke control because of its simple construction 13 comprises a valve lever 5 with variable translation.

Eine kompakte Bauweise bei niedriger Bauhöhe ergibt ein als Kipphebel 6 gestalteter Ventilhebel 5, wobei der Kipphebel 6 zwischen seinen beiden Endbereichen eine bogenförmige Gleitbahn 14 für einen über eine Schwinge 15 verlagerbaren Gleitstein 16 aufweist. Die Schwinge 15 ist in einem nicht gezeigten Zylinderkopf der Brennkraftmaschine nockenwellenseitig, vorzugsweise etwas unterhalb der Achse der Nockenwelle schwenkbeweglich gelagert. Mittels der schwenkbeweglich angeordneten Schwinge 15 wird mit der damit verbundenen Verlagerung des Gleitsteines 10 längs der bogenförmigen Gleitbahn 14 die Übersetzung des Kipphebels 6 geändert. Mit dieser veränderbaren Übersetzung ergibt sich ein veränderbarer Hub des Gaswechselventils 4. Dieser veränderbare Ventilhub des Gaswechselventiles 4 dient der gezielten Laststeuerung einer Brennkraftmaschine. Bei einer von der Steuereinrichtung 11 für variable Ventilöffnungswinkel unabhängig bzw. gesondert wirksamen variablen Hubsteuerung 13 kann über jedem gewählten Ventilöffnungswinkel der Hub des Gaswechselventiles 4 prinzipiell von einem Null-Hub bis zu einem Maximal-Hub variiert werden. A compact design with a low overall height results in a rocker arm 6 designed valve lever 5, the rocker arm 6 between its two end regions an arcuate slideway 14 for a displaceable via a rocker 15 Has sliding block 16. The rocker 15 is in a cylinder head, not shown the internal combustion engine, preferably slightly below the camshaft the axis of the camshaft is pivotally mounted. By means of the swiveling arranged rocker 15 is with the associated displacement the sliding block 10 along the arcuate slideway 14 the translation of the rocker arm 6 changed. With this changeable translation you get a changeable stroke of the gas exchange valve 4. This changeable valve stroke of the Gas exchange valves 4 are used for the targeted load control of an internal combustion engine. Independent of the control device 11 for variable valve opening angles or separately effective variable stroke control 13 can over each selected valve opening angle of the stroke of the gas exchange valve 4 in principle a zero stroke up to a maximum stroke can be varied.

Der Kipphebel 6 kann in seinem ventilseitigen Endbereich mit einer nicht gezeigten, selbsttätigen Ventilspielausgleichseinrichtung kombiniert sein.The rocker arm 6 can in its valve-side end region with a, not shown, automatic valve lash adjuster can be combined.

Weiter kann mit der erfindungsgemäßen Kombination aber auch erreicht werden, daß bei einer gewählten Übersetzung des Kipphebels 6 und damit bei einem konstanten Hub des Gaswechselventils 4 Ventilöffnungswinkel über die Steuereinrichtung 11 variiert werden.Furthermore, the combination according to the invention can also be used to achieve that with a chosen translation of the rocker arm 6 and thus at a constant Stroke of the gas exchange valve 4 valve opening angles via the control device 11 can be varied.

Für eine optimale Laststeuerung ist die Schwinge 15 kennfeldgesteuert angetrieben (nicht gezeigt). Diese Ausgestaltung ermöglicht es in vorteilhafter Weise, daß die variable Ventilöffnungswinkel-Steuerung 11 in Kombination mit der variablen Hubsteuerung 13 die Funktion eines Laststeuerorgans übernimmt und somit ein üblicherweise als Drosselklappe ausgebildetes Laststeuerorgan entfallen kann.For optimum load control, the rocker 15 is driven in a map-controlled manner (Not shown). This configuration advantageously enables the variable valve opening angle control 11 in combination with the variable Stroke control 13 takes over the function of a load control member and thus one Load control element usually designed as a throttle valve can be omitted.

Aus Figur 1 ist weiter erkennbar, daß an der Schwinge 15 eine auf den Ventilhebel 5 bzw. dem Kipphebel 6 vorgespannt einwirkende Feder 17 angeordnet ist, die insbesondere bei ventilseitiger Stellung der Schwinge 15 zur satten Anlage der Rolle 9 am Steuernocken 2 dient.From Figure 1 it can also be seen that one on the rocker arm 15 on the valve lever 5 or the rocker arm 6 biased spring 17 is arranged, the especially with the valve-side position of the rocker 15 for full contact with the Roll 9 on the control cam 2 is used.

Aus der Figur 2 ist erkennbar, daß für mehrere gleichartige Gaswechselventile 4 eine gemeinsam wirkende Schwinge 15 einsetzbar ist. In der in Figur 2 gezeigten Anordnung der gleichartigen Gaswechselventile 4 können diese entweder einem Zylinder einer Brennkraftmaschine oder zwei benachbarter Zylinder einer Brennkraftmaschine angehören.It can be seen from FIG. 2 that for several gas exchange valves 4 of the same type a rocker 15 acting together can be used. In the shown in Figure 2 Arrangement of the similar gas exchange valves 4 can either one Cylinder of an internal combustion engine or two adjacent cylinders of an internal combustion engine belong to.

Claims (8)

  1. A valve drive for internal combustion engines comprising a control device (11) for varying the valve opening angle,
    wherein a control cam (2) on a camshaft (3) actuates a gas change valve (4) via a valve lever (5) which
    co-operates with the control cam (2) via an intermediate element (10; 9) guided concentrically with the axis (7) of the camshaft (3) and
    automatically controlled by a control device (11) having an adjustable angle of rotation, in synchronism with the control cam (2) and in the same or in the opposite direction thereof, wherein
    the control device (11) for variable valve opening angles acts as a load control means or throttle valve for the internal combustion engine in combination with a variable means (13) for controlling the gas change valve (4) and operating independently or separately from the control device (11).
  2. A valve drive according to claim 1, characterised in that the variable stroke control means (13) is a valve lever (5) having a variable transmission ratio.
  3. A valve drive according to claims 1 and 2, characterised in that
    the end region on the control-cam side of the valve lever (5), in the form of a rocking lever (6), has a guide track (8) for the intermediate element (10), substantially concentric with the camshaft axis (7) and
    the valve lever (5) also has an arcuate track (14) between the end region on the valve side and the end region on the control cam side, and the track
    co-operates with a sliding ring movable by tilting on a movable oscillating crank (15) so as to alter the valve lever transmission ratio.
  4. A valve drive according to claims 1 to 3, characterised in that the tilting lever (6) in the end region on the valve side is combined with an automatic valve clearance compensating device.
  5. A valve drive according to claim 3, characterised in that the oscillating crank (15) on the camshaft side is mounted in or on a cylinder head of the internal combustion engine.
  6. A valve drive according to claims 3 to 5, characterised in that the oscillating crank (15) is driven under the control of a performance graph.
  7. A valve drive according to claims 3 to 6, characterised in that a spring (17) is mounted on the oscillating crank (15) and is prestressed and slidable on the rocking lever (6).
  8. A valve drive according to any of claims 3 to 7, characterised in that a number of valve levers (5) or similar gas change valves (4) are associated with a single oscillating crank (15).
EP95106520A 1994-06-08 1995-04-29 Valve drive with variable and independent control of the valve opening angle and of the valve lift Expired - Lifetime EP0686756B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4420064A DE4420064A1 (en) 1994-06-08 1994-06-08 Valve train with variable control of the valve opening angle
DE4420064 1994-06-08

Publications (2)

Publication Number Publication Date
EP0686756A1 EP0686756A1 (en) 1995-12-13
EP0686756B1 true EP0686756B1 (en) 1999-09-22

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ID=6520114

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Application Number Title Priority Date Filing Date
EP95106520A Expired - Lifetime EP0686756B1 (en) 1994-06-08 1995-04-29 Valve drive with variable and independent control of the valve opening angle and of the valve lift

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EP (1) EP0686756B1 (en)
DE (2) DE4420064A1 (en)
ES (1) ES2137396T3 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19532334A1 (en) * 1995-09-01 1997-03-06 Bayerische Motoren Werke Ag Variable valve train, especially for internal combustion engines
US5937809A (en) * 1997-03-20 1999-08-17 General Motors Corporation Variable valve timing mechanisms
DE19825308A1 (en) * 1998-06-05 1999-12-09 Bayerische Motoren Werke Ag Variable valve train for an internal combustion engine
DE19960742B4 (en) * 1999-12-16 2006-09-28 Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr Variable valve train, preferably for internal combustion engines
DE102004035005A1 (en) 2004-07-20 2006-02-16 Bayerische Motoren Werke Ag Valve gear of an internal combustion engine
FR2986558B1 (en) * 2012-02-02 2014-03-07 Melchior Jean F DEVICE FOR VARIABLY CONTROLLING AT LEAST ONE VALVE, FOR EXAMPLE FOR AN ALTERNATIVE ENGINE

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1401228A1 (en) * 1959-10-17 1968-12-19 Maschf Augsburg Nuernberg Ag Diesel engine and self-igniting medium pressure engine
US4382428A (en) * 1981-06-08 1983-05-10 Tourtelot Jr Edward M Contoured finger follower variable valve timing mechanism
US4469056A (en) * 1983-02-22 1984-09-04 Tourtelot Jr Edward M Dual follower variable valve timing mechanism
US4986227A (en) * 1990-05-08 1991-01-22 Dewey Iii Albert B Variable lift valve train
DE4220816A1 (en) * 1992-06-25 1994-01-05 Schaeffler Waelzlager Kg Adjustable valve control for IC engine - has adjustable intermediate member between cam and pivot lever along guide path

Also Published As

Publication number Publication date
EP0686756A1 (en) 1995-12-13
ES2137396T3 (en) 1999-12-16
DE59506871D1 (en) 1999-10-28
DE4420064A1 (en) 1995-12-14

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