EP0686756A1 - Valve drive with variable valve opening angle control - Google Patents

Valve drive with variable valve opening angle control Download PDF

Info

Publication number
EP0686756A1
EP0686756A1 EP95106520A EP95106520A EP0686756A1 EP 0686756 A1 EP0686756 A1 EP 0686756A1 EP 95106520 A EP95106520 A EP 95106520A EP 95106520 A EP95106520 A EP 95106520A EP 0686756 A1 EP0686756 A1 EP 0686756A1
Authority
EP
European Patent Office
Prior art keywords
valve
control
variable
train according
camshaft
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP95106520A
Other languages
German (de)
French (fr)
Other versions
EP0686756B1 (en
Inventor
Gert Fischer
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.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Publication of EP0686756A1 publication Critical patent/EP0686756A1/en
Application granted granted Critical
Publication of EP0686756B1 publication Critical patent/EP0686756B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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 from PCT / EP 93/03451.
  • the subject of this document is a valve train with a control device for variably changing the opening and closing of a globe valve with a substantially constant valve lift.
  • a control cam of a camshaft acts on the lift valve, for example, via a roller serving as an intermediate element and a valve lever.
  • the roller can be displaced along a path concentric with the camshaft axis in the valve lever.
  • this shift does not take place statically, depending on the load and speed, as is known, for example, from CH-PS 390 617, the opening and closing times being adjusted at the same time and the distance remaining constant and there being no change in the valve lift curve. Furthermore, the shift also does not take place in the manner known from DE-A 42 20 816, in which the roller which can be shifted concentrically to the camshaft axis in a rocker arm or rocker arm serves to change the valve lift by means of static adjustment of the change in the valve lever transmission ratio, the between opening and The closing time, which also remains constant, is only shifted towards early or late depending on the valve stroke.
  • a valve lever - is movably arranged and is in drive connection with a shaft of a control device that is constantly synchronously rotating and relatively rotatable with the camshaft of a control device in such a way that with each valve lift an engagement of the contact track, for example the roller, with the opening and closing flanks of the rotating control cam determines the valve opening phase is achieved by a force-controlled movement of the example roller in the same or opposite direction relative to the direction of rotation of the control cam.
  • the roller arranged on the transmission element side is moved in a controlled manner relative to the control cam acting with its direction of rotation, and in a second, opposite rotation angle assignment, the roller is moved in a controlled manner relative to the control cam acting against its direction of rotation.
  • the roller in the transmission member which is driven in the same direction relative to the control cam in each valve stroke and is thus dynamically controlled, this results in a large valve opening angle or a long valve opening period with an essentially constant valve stroke.
  • the roller in the transmission element which is driven in opposite directions with each valve stroke relative to the control cam and is therefore dynamically controlled, causes a relatively small valve opening angle or a short valve opening period with an essentially constant valve stroke.
  • the invention has for its object to develop this known valve train for effective load control.
  • a valve lever with a variable transmission ratio is selected as the variable stroke control. This results in a compact design with the lowest overall height of the combined device.
  • a variable valve lift control by means of a variable valve lever ratio is known per se from US-A 3 166 057, but with the fact that the valve opening angle is not variable, so that an additional speed-dependent influencing of the load control via early or late opening and closing angles, in contrast to the invention is not given.
  • 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, which on the control cam side has a guide 8 arranged concentrically with the axis 7 of the camshaft 3.
  • a guide 8 arranged concentrically with the axis 7 of the camshaft 3.
  • the positively controlled roller 9 is in drive connection via crank arms 12, for example with a crank mechanism (not shown) of the control device 11, the crank mechanism rotating synchronously with the camshaft 3.
  • roller 9 which can be displaced relative to the rotating control cam 2 according to the arrows A and B, is to shift the action of the control cam 2 on the rocker arm 6 for actuating the gas exchange valve 4 early or late, and thus to different valve opening angles or different valve opening periods achieve.
  • This control device 11 for variable valve opening angles or associated with this for variable valve spreading is combined according to the invention with a variable stroke control 13 for the gas exchange valve 4.
  • variable stroke control 13 because of its simple construction comprises a valve lever 5 with a variable transmission ratio.
  • a compact design with a low overall height results in a valve lever 5 designed as a rocker arm 6, the rocker arm 6 having an arcuate slideway 14 between its two end regions for a sliding block 16 which can be displaced via a rocker 15.
  • the rocker arm 15 is pivotally mounted in a cylinder head of the internal combustion engine, not shown, on the camshaft side, preferably somewhat below the axis of the camshaft.
  • the translation of the rocker arm 6 is changed with the associated displacement of the sliding block 10 along the arcuate slideway 14.
  • This changeable stroke of the gas exchange valve 4 results.
  • This changeable valve stroke of the gas exchange valve 4 is used for the targeted load control of an internal combustion engine.
  • the stroke of the gas exchange valve 4 can in principle be varied from a zero stroke to a maximum stroke over each selected valve opening angle.
  • the rocker arm 6 can be combined in its valve-side end region with an automatic valve lash adjuster (not shown).
  • valve opening angles can be varied via the control device 11 with a selected ratio of the rocker arm 6 and thus with a constant stroke of the gas exchange valve 4.
  • the rocker 15 is driven in a map-controlled manner (not shown).
  • This embodiment advantageously makes it possible for the variable valve opening angle control 11 in combination with the variable stroke control 13 to take over the function of a load control element, and thus a load control element usually designed as a throttle valve can be omitted.
  • a rocker 15 acting in common can be used for several similar gas exchange valves 4.
  • these can either belong to one cylinder of an internal combustion engine or two adjacent cylinders of an internal combustion engine.

Landscapes

  • 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)

Abstract

The valve drive has a control device to vary the valve opening angle. A cam (2) on a camshaft (3) operates a gas exchange valve (4) via a valve lever (5) acting with an intermediate roller (9) via an axis (7) of the camshaft. There is a control device (11) to synchronise the control cam by altering the angle. The valve drive has variable lift control (13) in the form of a valve lever (5) of variable transmission ratio. This lift control can be operated separately from the control device (11) for varying the valve opening angle. The valve lever has a concentric guide track (8) for an intermediate element. <IMAGE>

Description

Die Erfindung geht gemäß dem Oberbegriff des Patentanspruches 1 von der PCT/EP 93/03451 aus.The invention is based on the preamble of claim 1 from PCT / EP 93/03451.

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 vertagerbar.The subject of this document is a valve train with a control device for variably changing the opening and closing of a globe valve with a substantially constant valve lift. In this control device, a control cam of a camshaft acts on the lift valve, for example, via a roller serving as an intermediate element and a valve lever. To change the valve opening period, the roller can be displaced along a path concentric with the camshaft axis in the 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 statically, depending on the load and speed, as is known, for example, from CH-PS 390 617, the opening and closing times being adjusted at the same time and the distance remaining constant and there being no change in the valve lift curve. Furthermore, the shift also does not take place in the manner known from DE-A 42 20 816, in which the roller which can be shifted concentrically to the camshaft axis in a rocker arm or rocker arm serves to change the valve lift by means of static adjustment of the change in the valve lever transmission ratio, the between opening and The closing time, which also remains constant, is only shifted towards early or late depending on the valve stroke.

Demgegenüber wird bei dem von der FR-A 2 500 528 ausgehenden Anmeldegegenstand der eingangs genannten PCT/EP 93/03451 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, it is proposed in the subject of the application based on FR-A 2 500 528 the aforementioned PCT / EP 93/03451 that the intermediate element - e.g. a roller - over a circular arc section essentially concentric to the axis of the camshaft in / on a transmission member - e.g. a valve lever - is movably arranged and is in drive connection with a shaft of a control device that is constantly synchronously rotating and relatively rotatable with the camshaft of a control device in such a way that with each valve lift an engagement of the contact track, for example the roller, with the opening and closing flanks of the rotating control cam determines the valve opening phase is achieved by a force-controlled movement of the example roller in the same or opposite direction relative to the direction of rotation of the control cam.

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 Steuernocken 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 of the shaft of the control device which rotates synchronously with the camshaft, the roller arranged on the transmission element side is moved in a controlled manner relative to the control cam acting with its direction of rotation, and in a second, opposite rotation angle assignment, the roller is moved in a controlled manner relative to the control cam acting against its direction of rotation. With the roller in the transmission member, which is driven in the same direction relative to the control cam in each valve stroke and is thus dynamically controlled, this results in a large valve opening angle or a long valve opening period with an essentially constant valve stroke. In contrast, the roller in the transmission element, which is driven in opposite directions with each valve stroke relative to the control cam and is therefore dynamically controlled, causes a relatively small valve opening angle or a short valve opening period with an essentially constant valve stroke.

Der Erfindung liegt die Aufgabe zugrunde, diesen bekannten Ventiltrieb für eine wirksame Laststeuerung weiterzubilden.The invention has for its object to develop this known valve train for 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. Nach einer bevorzugten Ausgestaltung ist es besonders vorteilhaft, wenn beide Steuerungen voneinander unabhängig zur Wirkung gebracht werden können. 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. By the inventive combination of a variable stroke control with the variable control of the valve opening angle In the known valve train, targeted load control of the internal combustion engine is possible. In particular, if the valve opening angle is kept constant, the stroke of the gas exchange valve can be varied in accordance with the respective load, specifically over the entire valve stroke. According to a preferred embodiment, it is particularly advantageous if both controls can be brought into effect independently of one another. This advantageously makes it possible for the variable valve opening angle control, in combination with the variable stroke control, to take over the function of a load control element and thus to dispense with a separate load control element designed, for example, as a throttle valve.

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 particularly preferred design, a valve lever with a variable transmission ratio is selected as the variable stroke control. This results in a compact design with the lowest overall height of the combined device. A variable valve lift control by means of a variable valve lever ratio is known per se from US-A 3 166 057, but with the fact that the valve opening angle is not variable, so that an additional speed-dependent influencing of the load control via early or late opening and closing angles, in contrast to the invention is not given.

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 Steuernocken 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, which on the control cam side has a guide 8 arranged concentrically with the axis 7 of the camshaft 3. Along the guide 8 is an intermediate element designed as a roller 9 10 via a control device 11, not shown, according to the arrow directions A and B relative to the rotating control cam 2 in the same direction and in the opposite direction. The positively controlled roller 9 is in drive connection via crank arms 12, for example with a crank mechanism (not shown) of the control device 11, the crank mechanism rotating synchronously with the camshaft 3. The purpose of the roller 9, which can be displaced relative to the rotating control cam 2 according to the arrows A and B, is to shift the action of the control cam 2 on the rocker arm 6 for actuating the gas exchange valve 4 early or late, and thus to different valve opening angles or different valve opening periods achieve. (Further details in PCT / EP 93/03451 mentioned at the beginning.)

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 associated with this for variable valve spreading 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 13 because of its simple construction comprises a valve lever 5 with a variable transmission ratio.

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 valve lever 5 designed as a rocker arm 6, the rocker arm 6 having an arcuate slideway 14 between its two end regions for a sliding block 16 which can be displaced via a rocker 15. The rocker arm 15 is pivotally mounted in a cylinder head of the internal combustion engine, not shown, on the camshaft side, preferably somewhat below the axis of the camshaft. By means of the pivotably arranged rocker arm 15, the translation of the rocker arm 6 is changed with the associated displacement of the sliding block 10 along the arcuate slideway 14. With this changeable translation, a changeable stroke of the gas exchange valve 4 results. This changeable valve stroke of the gas exchange valve 4 is used for the targeted load control of an internal combustion engine. In the case of a variable stroke control 13 which is independent or separately effective from the control device 11 for variable valve opening angles, the stroke of the gas exchange valve 4 can in principle be varied from a zero stroke to a maximum stroke over each selected valve opening angle.

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

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

Für eine optimale Laststeuerung ist die Schwinge 15 kennfeldgesteuert angetrieben (nicht gezeigt). Diese Ausgestaltung ermöglicht es in vorteilhafter Weise, daR 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 embodiment advantageously makes it possible for the variable valve opening angle control 11 in combination with the variable stroke control 13 to take over the function of a load control element, and thus a 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 on the rocker 15 a spring 17 acting on the valve lever 5 or the rocker arm 6 is arranged, which serves in particular with the valve-side position of the rocker 15 for full contact of the roller 9 on the control cam 2.

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 a rocker 15 acting in common can be used for several similar gas exchange valves 4. In the arrangement of the similar gas exchange valves 4 shown in FIG. 2, these can either belong to one cylinder of an internal combustion engine or two adjacent cylinders of an internal combustion engine.

Claims (10)

Ventiltrieb mit einer Steuereinrichtung für variable Ventilöffnungswinkel, insbesondere für Brennkraftmaschinen, - bei der ein Steuernocken (2) einer Nockenwelle (3) ein Gaswechselventil (4) über einen Ventilhebel (5) betätigt, der - mit dem Steuernocken (2) über ein zur Achse (7) der Nockenwelle (3) konzentrisch geführtes Zwischenelement (10; Rolle 9) zusammenwirkt, das - mittels einer drehwinkelverstellbaren Steuereinrichtung (11) mit dem drehenden Steuernocken (2) synchron zu diesem relativ gleich- und gegensinnig zwangsgesteuert ist, - gekennzeichnet durch die Kombination mit einer variablen Hubsteuerung (13) für das Gaswechselventil (4). Valve train with a control device for variable valve opening angles, in particular for internal combustion engines, - In which a control cam (2) of a camshaft (3) actuates a gas exchange valve (4) via a valve lever (5) which - Interacts with the control cam (2) via an intermediate element (10; roller 9) which is guided concentrically to the axis (7) of the camshaft (3) and which - is controlled by means of a control device (11) adjustable in angle of rotation with the rotating control cam (2) synchronously to the latter in the same way and in the opposite direction, - characterized by the combination with a variable stroke control (13) for the gas exchange valve (4). Ventiltrieb nach Anspruch 1, dadurch gekennzeichnet, daß als variable Hubsteuerung (13) ein Ventilhebel (5) mit veränderbarer Übersetzung dient.Valve train according to claim 1, characterized in that a valve lever (5) with variable transmission ratio serves as variable stroke control (13). Ventiltrieb nach Anspruch 1 und 2, dadurch gekennzeichnet, daß die variable Hubsteuerung (13) von der Steuereinrichtung (11) für variable Ventilöffnungswinkel unabhängig bzw. gesondert wirksam ist.Valve train according to claims 1 and 2, characterized in that the variable stroke control (13) is independent of the control device (11) for variable valve opening angles. Ventiltrieb nach den Ansprüchen 1 bis 3, dadurch gekennzeichnet, - daß der als ein Kipphebel (6) gestaltete Ventilhebel (5) im steuernockenseitigen Endbereich eine zur Nockenwellen-Achse (7) im wesentlichen konzentrische Führungsbahn (8) für das Zwischenelement (10) aufweist, und - ferner zwischen dem ventilseitigen und dem steuernockenseitigen Endbereich eine bogenförmige Gleitbahn (14) aufweist, die - mit einem an einer verlagerbaren Schwinge (15) kippbeweglich angeordneten Gleitstein zur Änderung der Ventilhebel-Übersetzung zusammenwirkt. Valve train according to claims 1 to 3, characterized in - That the as a rocker arm (6) designed valve lever (5) in the control cam-side end area to the camshaft axis (7) substantially concentric guide track (8) for the intermediate element (10), and - Furthermore, between the valve-side and the control cam-side end region has an arcuate slideway (14) - Interacts with a sliding block arranged on a displaceable rocker (15) for changing the valve lever ratio. Ventiltrieb nach den Ansprüchen 1 bis 4, dadurch gekennzeichnet, daß der Kipphebel (6) im ventilseitigen Endbereich mit einer selbsttätigen Ventilspiel-Ausgleichseinrichtung kombiniert ist.Valve train according to claims 1 to 4, characterized in that the rocker arm (6) is combined in the end area on the valve side with an automatic valve lash adjuster. Ventiltrieb nach den Ansprüchen 1 bis 5, dadurch gekennzeichnet, daß die Schwinge (15) nockenwellenseitig in/an einem Zylinderkopf gelagert ist.Valve train according to claims 1 to 5, characterized in that the rocker arm (15) is mounted on the camshaft side in / on a cylinder head. Ventiltrieb nach den Ansprüchen 1 bis 6, dadurch gekennzeichnet, daß die Schwinge (15) kennfeldgesteuert angetrieben ist.Valve train according to claims 1 to 6, characterized in that the rocker (15) is driven in a map-controlled manner. Ventiltrieb nach den Ansprüchen 1 bis 7, dadurch gekennzeichnet, daß an der Schwinge (15) eine Feder (17) angeordnet ist, die am Kipphebel (6) vorgespannt gleitbeweglich anliegt.Valve drive according to claims 1 to 7, characterized in that a spring (17) is arranged on the rocker arm (15), which rests on the rocker arm (6) in a preloaded, slidable manner. Ventiltrieb nach den Ansprüchen 1 bis 8, dadurch gekennzeichnet, daß mehreren Ventilhebeln (5) für gleichartige Gaswechselventile (4) eine einzige Schwinge (15) zugeordnet ist.Valve train according to claims 1 to 8, characterized in that a plurality of valve levers (5) for similar gas exchange valves (4) is assigned a single rocker (15). Ventiltrieb nach den Ansprüchen 1 bis 9, dadurch gekennzeichnet, daß die variable Ventilöffnungswinkel-Steuerung (11) in Kombination mit der variablen Hubsteuerung (13) als Laststeuerorgan dient.Valve train according to claims 1 to 9, characterized in that the variable valve opening angle control (11) in combination with the variable stroke control (13) serves as a load control element.
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
DE4420064 1994-06-08
DE4420064A DE4420064A1 (en) 1994-06-08 1994-06-08 Valve train with variable control of the valve opening angle

Publications (2)

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

Family

ID=6520114

Family Applications (1)

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

Country Status (3)

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

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5937809A (en) * 1997-03-20 1999-08-17 General Motors Corporation Variable valve timing mechanisms
EP0962629A3 (en) * 1998-06-05 2000-10-18 Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 Variable valve drive for internal combustion engine
EP1619362A2 (en) 2004-07-20 2006-01-25 Bayerische Motoren Werke Aktiengesellschaft Valve train for an internal combustion engine
CN104136723A (en) * 2012-02-02 2014-11-05 让·弗雷德里克·梅尔基奥尔 Device for the variable control of at least one valve, for example for a reciprocating engine

Families Citing this family (2)

* 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
DE19960742B4 (en) * 1999-12-16 2006-09-28 Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr Variable valve train, preferably for internal combustion engines

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3166057A (en) * 1959-10-17 1965-01-19 Maschf Augsburg Nuernberg Ag Method and apparatus of utilizing exhaust gases in the internal combustion engine cycle
GB2100344A (en) * 1981-06-08 1982-12-22 Tourtelot Edward Mortimer Ic engine 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

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3166057A (en) * 1959-10-17 1965-01-19 Maschf Augsburg Nuernberg Ag Method and apparatus of utilizing exhaust gases in the internal combustion engine cycle
GB2100344A (en) * 1981-06-08 1982-12-22 Tourtelot Edward Mortimer Ic engine 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

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5937809A (en) * 1997-03-20 1999-08-17 General Motors Corporation Variable valve timing mechanisms
EP0962629A3 (en) * 1998-06-05 2000-10-18 Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 Variable valve drive for internal combustion engine
EP1619362A2 (en) 2004-07-20 2006-01-25 Bayerische Motoren Werke Aktiengesellschaft Valve train for an internal combustion engine
EP1619362A3 (en) * 2004-07-20 2010-01-27 Bayerische Motoren Werke Aktiengesellschaft Valve train for an internal combustion engine
CN104136723A (en) * 2012-02-02 2014-11-05 让·弗雷德里克·梅尔基奥尔 Device for the variable control of at least one valve, for example for a reciprocating engine
CN104136723B (en) * 2012-02-02 2017-07-07 让·弗雷德里克·梅尔基奥尔 Control the changeable controller of an at least valve

Also Published As

Publication number Publication date
DE59506871D1 (en) 1999-10-28
EP0686756B1 (en) 1999-09-22
DE4420064A1 (en) 1995-12-14
ES2137396T3 (en) 1999-12-16

Similar Documents

Publication Publication Date Title
EP0659232B1 (en) Variable control process and device for an internal combustion engine valve
EP1853797B1 (en) Variable mechanical valve control for an internal combustion engine
DE19960742B4 (en) Variable valve train, preferably for internal combustion engines
EP1084330B1 (en) Valve timing system for an internal combustion engine
EP0521412B1 (en) Internal combustion engine with rocker lever valve drive
DE102005010182B4 (en) Variable mechanical valve control of an internal combustion engine
EP0686756B1 (en) Valve drive with variable and independent control of the valve opening angle and of the valve lift
EP1375847A2 (en) Variable valve drive
DE3520859A1 (en) Internal combustion engine
DE19702389A1 (en) Valve drive for internal combustion engine
DE10320324A1 (en) Valve actuating system for internal combustion engine has intermediate component supported and pivotably guided on variable position component to engage cam of camshaft and stroke-transmitting arrangement
DE10312959B4 (en) Device for the variable actuation of gas exchange valves of internal combustion engines
EP0626035B1 (en) Valve control for an internal combustion engine
EP0352580B1 (en) Operating system of internal-combustion engine valves
DE4300684C2 (en) Valve train for variable control of internal combustion engines
EP1608852B1 (en) Device for the variable actuation of gas exchange valves of internal combustion engines and method for operating said device
DE102004038473B4 (en) Valve train for charge exchange valves of internal combustion engines
DE10137072A1 (en) Device for driving valve of piston stroke engine includes operating cam which completes rotationally swinging movements about constant rotational point
EP0685633A1 (en) Valve control with a device for varying the opening and closing time of a poppet valve, particularly for internal combustion engines
DE19502836A1 (en) IC engine with cyclic change of speed for gas change control cam
DE4300487C2 (en) Device for valve clearance adjustment in variable valve controls of internal combustion engines
DE19501172C2 (en) Rotary drive arrangement
DE102004027636A1 (en) Control device for adjusting the angle of rotation of a camshaft
DE19929296A1 (en) Device to vary the timing of IC engines has two wheel pairings with drive and take-off pulleys, gas exchange element, and adjusting mechanism for wheel pairings
DE1945046C (en) Valve control

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE ES FR GB IT

17P Request for examination filed

Effective date: 19960528

17Q First examination report despatched

Effective date: 19980917

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE ES FR GB IT

RTI1 Title (correction)

Free format text: VALVE DRIVE WITH VARIABLE AND INDEPENDENT CONTROL OF THE VALVE OPENING ANGLE AND OF THE VALVE LIFT

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 19990922

REF Corresponds to:

Ref document number: 59506871

Country of ref document: DE

Date of ref document: 19991028

ET Fr: translation filed
ITF It: translation for a ep patent filed

Owner name: STUDIO JAUMANN P. & C. S.N.C.

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2137396

Country of ref document: ES

Kind code of ref document: T3

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: ES

Payment date: 20070327

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20070425

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20070614

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20070426

Year of fee payment: 13

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20080429

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20081231

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20080430

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20080430

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20080429

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20080430

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20080429

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20120615

Year of fee payment: 18

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20131101

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 59506871

Country of ref document: DE

Effective date: 20131101