EP1039103B1 - Device for modifying the valve lift in an engine cylinder head - Google Patents

Device for modifying the valve lift in an engine cylinder head Download PDF

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Publication number
EP1039103B1
EP1039103B1 EP00104801A EP00104801A EP1039103B1 EP 1039103 B1 EP1039103 B1 EP 1039103B1 EP 00104801 A EP00104801 A EP 00104801A EP 00104801 A EP00104801 A EP 00104801A EP 1039103 B1 EP1039103 B1 EP 1039103B1
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EP
European Patent Office
Prior art keywords
rotation
axis
lever
control shaft
path
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
Application number
EP00104801A
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German (de)
French (fr)
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EP1039103A2 (en
EP1039103A3 (en
Inventor
Rolf Dr. Schlachter
Anton Schollweck
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Bayerische Motoren Werke AG
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Bayerische Motoren Werke AG
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Publication of EP1039103A2 publication Critical patent/EP1039103A2/en
Publication of EP1039103A3 publication Critical patent/EP1039103A3/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—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
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • F01L1/185—Overhead end-pivot rocking arms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/20—Adjusting or compensating clearance
    • F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
    • F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
    • F01L1/2405—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically by means of a hydraulic adjusting device located between the cylinder head and rocker arm
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • 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
    • F01L2013/0068—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 with an oscillating cam acting on the valve of the "BMW-Valvetronic" type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2305/00—Valve arrangements comprising rollers

Definitions

  • the invention relates to a Device for stroke adjustment of a gas exchange valve in the cylinder head Internal combustion engine, wherein a cooperating with the gas exchange valve
  • the transmission element is in line contact with an idle stroke curve and one Stroke curve control path on one lever, the other Lever end in line contact is with a cam on one in the cylinder head controlled rotatable and fixable control shaft, one in the cylinder head for Control shaft camshaft arranged in parallel via a cam on a cam track acts on the swivel lever to actuate the gas exchange valve.
  • Such a device is known for example from DE 42 23 172 C1.
  • the to achieve a variable stroke - zero stroke to full stroke - from Cam of a camshaft swiveled pivot lever in its free Lever end adjacent to the line contact with one used for stroke adjustment Cam is guided over a slot on a bolt fixed to the housing.
  • this slot guide many swivel levers on a common guide pin or common guide rod a multi-cylinder internal combustion engine increased friction with the danger a tilt of the swivel lever (s).
  • the common Guide rod for the swivel levers of all cylinders of the internal combustion engine an increased space requirement.
  • the invention is based, for a device for stroke adjustment the task a gas exchange valve a space-saving construction without the risk of to show frictional tilting of the swivel lever.
  • each pivot lever has a common one Hinge pin is guided by means of two spaced-apart articulation levers.
  • the device for stroke adjustment can be subjected to higher loads on the swivel lever without the risk of removing line contact. This affects advantageous on acoustics and wear of the device. Further reduced in advantageously the friction. Through the safer according to the invention Swivel lever can also reduce the preload of the return springs, malfunctions are nevertheless excluded.
  • a device 1 for stroke adjustment of a gas exchange valve 2 in the cylinder head 3 ( Figure 3) of an internal combustion engine, not shown, includes one with the gas exchange valve 2 cooperating transmission element 4, which in 5 via a roller Line contact is with an idle stroke curve 6 ′ and a stroke curve 6 ′′ Control path 6 on a pivot lever 7.
  • the pivot lever 7 is on other lever end 8 at 8 'in line contact with one of the stroke settings of the Gas exchange valve 2 serving cam 9 controlled on one in the cylinder head 3 rotatable and fixable control shaft 10, one in the cylinder head 3 for Control shaft 10 arranged in parallel camshaft 11 via a cam 12 on a Cam track or roller 13 on the pivot lever 7 for actuating the gas exchange valve 2 acts.
  • the articulation point 17 of the articulation lever 16 on the swivel lever 7 through an intersection of two circular arcs "K 1 , K 2 " around the end points 18, 18 'is a fictitious trajectory 19 of the axis of rotation 15 of the control shaft 10, approximated by an arc determined, the fictitious trajectory 19 of the control shaft axis of rotation 15 with a fixed four-bar joint a, b, c with the coupling "b" pivot lever 7 serves as a kinematically equivalent replacement of the real adjustment of the cam 9 for the region of the idle stroke curve 6 ', the End points 20, 20 'determine the circular arc centers 18, 18' on the fictitious trajectory 19.
  • crank “a” is finally the distance from the center of curvature of the cam track or the axis of rotation 23 of the roller 13 of the pivot lever 7 from the axis of rotation 24 of the camshaft 11 acting on the roller 13 via the cam 12 established.
  • FIG. 1 A possible embodiment of the articulation lever 16 can be seen in FIG. 1, the upper part of the articulation lever 16 being bow-shaped for easier assembly is executed. It is non-positive on the cylindrical part of the control shaft 10 held, and can also be secured against detachment.
  • the pivot lever 7 is preferably via a common hinge pin 25 by means of two spaced-apart, fork-like link levers 16 guided.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Valve Device For Special Equipments (AREA)

Description

Die Erfindung bezieht sich gemäß dem Oberbegriff des Patentanspruches 1 auf eine Vorrichtung zur Hubverstellung eines Gaswechselventils im Zylinderkopf einer Brennkraftmaschine, wobei ein mit dem Gaswechselventil zusammenwirkendes Übertragungselement in Linienberührung steht mit einer eine Leerhubkurve und eine Hubkurve umfassenden Steuerbahn an einem Schwenkhebel, der am anderen Hebelende in Linienberührung steht mit einer Kurvenscheibe auf einer im Zylinderkopf gesteuert dreh- und fixierbaren Steuerwelle, wobei eine im Zylinderkopf zur Steuerwelle parallel angeordnete Nockenwelle über einen Nocken auf eine Kurvenbahn am Schwenkhebel zur Hubbetätigung des Gaswechselventils einwirkt.According to the preamble of claim 1, the invention relates to a Device for stroke adjustment of a gas exchange valve in the cylinder head Internal combustion engine, wherein a cooperating with the gas exchange valve The transmission element is in line contact with an idle stroke curve and one Stroke curve control path on one lever, the other Lever end in line contact is with a cam on one in the cylinder head controlled rotatable and fixable control shaft, one in the cylinder head for Control shaft camshaft arranged in parallel via a cam on a cam track acts on the swivel lever to actuate the gas exchange valve.

Eine derartige Vorrichtung ist beispielsweise aus der DE 42 23 172 C1 bekannt. Hierbei ist der zur Erzielung eines variablen Hubes - Null-Hub bis Voll-Hub - vom Nocken einer Nockenwelle verschwenkte Schwenkhebel in seinem freien Hebelende benachbart der Linienberührung mit einer der Hubeinstellung dienenden Kurvenscheibe über ein Langloch an einem gehäusefesten Bolzen geführt. Wie insbesondere aus den Figuren der weiteren DE 43 26 331 A1 zu einer bauartgleichen Vorrichtung ersichtlich, ergibt sich mit dieser Langlochführung vieler Schwenkhebel auf einem gemeinsamen Führungsbolzen bzw. gemeinsamen Führungsstange bei einer mehrzylindrigen Brennkraftmaschine eine erhöhte Reibung mit der Gefahr einer Verkantung des/der Schwenkhebel. Weiter ist mit der Anordnung der gemeinsamen Führungsstange für die Schwenkhebel sämtlicher Zylinder der Brennkraftmaschine ein erhöhter Platzbedarf verbunden.Such a device is known for example from DE 42 23 172 C1. Here is the to achieve a variable stroke - zero stroke to full stroke - from Cam of a camshaft swiveled pivot lever in its free Lever end adjacent to the line contact with one used for stroke adjustment Cam is guided over a slot on a bolt fixed to the housing. How in particular from the figures of the further DE 43 26 331 A1 to an identical design Device visible, results with this slot guide many swivel levers on a common guide pin or common guide rod a multi-cylinder internal combustion engine increased friction with the danger a tilt of the swivel lever (s). Next is the arrangement of the common Guide rod for the swivel levers of all cylinders of the internal combustion engine an increased space requirement.

Der Erfindung liegt die Aufgabe zugrunde, für eine Vorrichtung zur Hubverstellung eines Gaswechselventils eine bauraumsparende Konstruktion ohne die Gefahr einer reibungsbehafteten Verkantung des Schwenkhebels aufzuzeigen.The invention is based, for a device for stroke adjustment the task a gas exchange valve a space-saving construction without the risk of to show frictional tilting of the swivel lever.

Diese Aufgabe ist mit dem Patentanspruch 1 gelöst. Diese Lösung sieht vor, daß der Schwenkhebel in seinen vom Nocken und einer Rückstellfeder bewirkten Schwenkbewegungen mittels eines koaxial zur Drehachse der Steuerwelle drehbeweglich gelagerten Anlenkhebels geführt ist, dessen Anlenkpunkt am Schwenkhebel durch einen Schnittpunkt zweier Kreisbögen um die Endpunkte einer fiktiven, durch einen Kreisbogen angenäherten Bahnkurve der Drehachse der Steuerwelle bestimmt ist, wobei die fiktive Bahnkurve der Steuerwellen-Drehachse bei festgehalten gedachtem Viergelenk (a, b, c) mit der Koppel "b" = Schwenkhebel als kinematisch äquivalenter Ersatz der realen Verstellung der Kurvenscheibe für den Bereich der Leerhubkurve dient, deren Endpunkte die Kreisbögen-Mittelpunkte auf der fiktiven Bahnkurve bestimmen.This object is achieved with patent claim 1. This solution provides that the Swivel lever in its swivel movements caused by the cam and a return spring rotatable by means of a coaxial to the axis of rotation of the control shaft mounted pivot lever is guided, the pivot point on the pivot lever an intersection of two arcs around the end points of a fictitious one Circular arc approximate path curve of the axis of rotation of the control shaft is determined, where the fictitious trajectory of the control shaft axis of rotation is held in mind Four-bar linkage (a, b, c) with the coupling "b" = swivel lever as kinematically equivalent Replacement of the real adjustment of the cam disc for the area of the idle stroke curve serves, whose end points are the centers of the circular arcs on the fictitious trajectory determine.

Der Vorteil der Erfindung ist, daß jeder Schwenkhebel über einen gemeinsamen Gelenkbolzen mittels zweier, beabstandet angeordneter Anlenkhebeln geführt ist.The advantage of the invention is that each pivot lever has a common one Hinge pin is guided by means of two spaced-apart articulation levers.

Zur kinematischen Auslegung der als ein Viergelenk betrachteten Vorrichtung wird weiter vorgeschlagen, daß auf der von der Drehachse einer am Übertragungselement angeordneten Rolle ausgehenden Kurbel "c" des Viergelenks (a, b, c) ein Mittelpunkt (M) eines Radiusstrahls der Leerhubkurve abgebildet ist, wobei der Mittelpunkt (M) sich beim Verstellen der Kurvenscheibe für die Hubverstellung auf einem Kreisbogen um die Rollen-Drehachse am Übertragungselement jenseits der Steuerwellen-Drehachse bewegt, und daß ferner mit der Kurbel "a" der Abstand des Krümmungsmittelpunktes der Kurvenbahn des Schwenkhebels von der Drehachse der auf die Kurvenbahn über den Nocken einwirkenden Nockenwelle festgelegt ist.For the kinematic interpretation of the device considered as a four-bar link further suggested that on the one of the axis of rotation on the transmission element arranged roller outgoing crank "c" of the four-bar linkage (a, b, c) Center point (M) of a radius beam of the idle stroke curve is shown, the center point (M) when adjusting the cam for the stroke adjustment an arc around the roller axis of rotation on the transmission element beyond Control shaft axis of rotation moves, and that further with the crank "a" the distance of the Center of curvature of the curved path of the pivot lever from the axis of rotation the camshaft acting on the cam track above the cam is fixed.

Mit der erfindungsgemäßen kinematischen Auslegung und Anordnung des Anlenkhebels am Schwenkhebel kann die Vorrichtung zur Hubverstellung höher belastet werden ohne die Gefahr der Aufhebung von Linienberührungen. Dies wirkt sich vorteilhaft auf Akustik und Verschleiß der Vorrichtung aus. Weiter reduziert sich in vorteilhafter Weise die Reibung. Durch den erfindungsgemäß sicherer geführten Schwenkhebel kann auch die Vorspannung der Rückstellfedern reduziert werden, wobei trotzdem Fehlfunktionen ausgeschlossen sind.With the kinematic design and arrangement of the link lever according to the invention the device for stroke adjustment can be subjected to higher loads on the swivel lever without the risk of removing line contact. This affects advantageous on acoustics and wear of the device. Further reduced in advantageously the friction. Through the safer according to the invention Swivel lever can also reduce the preload of the return springs, malfunctions are nevertheless excluded.

Die Erfindung ist anhand eines in der Zeichnung dargestellten Ausführungsbeispiels beschrieben. Es zeigt

Figur 1
eine erfindungsgemäße Vorrichtung zur Hubverstellung eines Gaswechselventils in Frontalansicht,
Figur 2
die Vorrichtung nach Figur 1 in Seitenansicht bei weggelassener Rückstellfeder,
Figur 3
die Vorrichtung nach Figur 1 als Viergelenk mit weiteren kinematischen Daten für den Anlenkhebel.
The invention is described with reference to an embodiment shown in the drawing. It shows
Figure 1
an inventive device for stroke adjustment of a gas exchange valve in front view,
Figure 2
2 shows the device according to FIG. 1 in a side view with the return spring omitted,
Figure 3
the device of Figure 1 as a four-bar linkage with additional kinematic data for the link lever.

Eine Vorrichtung 1 zur Hubverstellung eines Gaswechselventils 2 im Zylinderkopf 3 (Figur 3) einer nicht gezeigten Brennkraftmaschine umfaßt ein mit dem Gaswechselventil 2 zusammenwirkendes Übertragungselement 4, das über eine Rolle 5 in Linienberührung steht mit einer eine Leerhubkurve 6' und eine Hubkurve 6" umfassenden Steuerbahn 6 an einem Schwenkhebel 7. Der Schwenkhebel 7 steht am anderen Hebelende 8 bei 8' in Linienberührung mit einer der Hubeinstellung des Gaswechselventils 2 dienenden Kurvenscheibe 9 auf einer im Zylinderkopf 3 gesteuert dreh- und fixierbaren Steuerwelle 10, wobei eine im Zylinderkopf 3 zur Steuerwelle 10 parallel angeordnete Nockenwelle 11 über einen Nocken 12 auf eine Kurvenbahn bzw. Rolle 13 am Schwenkhebel 7 zur Hubbetätigung des Gaswechselventils 2 einwirkt.A device 1 for stroke adjustment of a gas exchange valve 2 in the cylinder head 3 (Figure 3) of an internal combustion engine, not shown, includes one with the gas exchange valve 2 cooperating transmission element 4, which in 5 via a roller Line contact is with an idle stroke curve 6 ′ and a stroke curve 6 ″ Control path 6 on a pivot lever 7. The pivot lever 7 is on other lever end 8 at 8 'in line contact with one of the stroke settings of the Gas exchange valve 2 serving cam 9 controlled on one in the cylinder head 3 rotatable and fixable control shaft 10, one in the cylinder head 3 for Control shaft 10 arranged in parallel camshaft 11 via a cam 12 on a Cam track or roller 13 on the pivot lever 7 for actuating the gas exchange valve 2 acts.

Eine erfindungsgemäß vorteilhaft bauraumsparende Konstruktion ohne die Gefahr einer reibungsbehafteten Verkantung des Schwenkhebels 7 ist dadurch erreicht, daß der Schwenkhebel 7 in seinen vom Nocken 12 und einer Rückstellfeder 14 bewirkten Schwenkbewegungen gemäß Pfeil "A" mittels eines koaxial zur Drehachse 15 der Steuerwelle 10 drehbeweglich gelagerten Anlenkhebel 16 geführt ist.An advantageous construction space-saving construction according to the invention without the risk frictional tilting of the swivel lever 7 is achieved that the pivot lever 7 in its caused by the cam 12 and a return spring 14 Swivel movements according to arrow "A" using a coaxial to the axis of rotation 15 of the control shaft 10 pivotally mounted articulation lever 16 is guided.

Wie aus Figur 3 ersichtlich, ist der Anlenkpunkt 17 des Anlenkhebels 16 am Schwenkhebel 7 durch einen Schnittpunkt zweier Kreisbögen "K1, K2" um die Endpunkte 18, 18' einer fiktiven, durch einen Kreisbogen angenäherten Bahnkurve 19 der Drehachse 15 der Steuerwelle 10 bestimmt, wobei die fiktive Bahnkurve 19 der Steuerwellen-Drehachse 15 bei festgehalten gedachtem Viergelenk a, b, c mit der Koppel "b" = Schwenkhebel 7 als kinematisch äquivalenter Ersatz der realen Verstellung der Kurvenscheibe 9 für den Bereich der Leerhubkurve 6' dient, deren Endpunkte 20, 20' die Kreisbögen-Mittelpunkte 18, 18' auf der fiktiven Bahnkurve 19 bestimmen.As can be seen from FIG. 3, the articulation point 17 of the articulation lever 16 on the swivel lever 7 through an intersection of two circular arcs "K 1 , K 2 " around the end points 18, 18 'is a fictitious trajectory 19 of the axis of rotation 15 of the control shaft 10, approximated by an arc determined, the fictitious trajectory 19 of the control shaft axis of rotation 15 with a fixed four-bar joint a, b, c with the coupling "b" = pivot lever 7 serves as a kinematically equivalent replacement of the real adjustment of the cam 9 for the region of the idle stroke curve 6 ', the End points 20, 20 'determine the circular arc centers 18, 18' on the fictitious trajectory 19.

Weiter ist aus Figur 3 ersichtlich, daß auf der von der Drehachse 21 einer am Übertragungselement 4 angeordneten Rolle 5 ausgehenden Kurbel "c" des Viergelenks a, b, c ein Mittelpunkt "M" eines Radiusstrahls RLH der Leerhubkurve 6' abgebildet ist, wobei der Mittelpunkt "M" sich beim Verstellen der Kurvenscheibe 9 auf einem Kreisbogen 22 um die Rollen-Drehachse 21 am Übertragungselement 4 jenseits der Steuerwellen-Drehachse 15 bewegt.It can further be seen from FIG. 3 that a center "M" of a radius beam R LH of the idle stroke curve 6 'is shown on the crank "c" of the four-bar linkage a, b, c starting from the axis of rotation 21 of a roller 5 arranged on the transmission element 4, wherein the center point "M" moves when the cam disc 9 is moved on a circular arc 22 about the roller axis of rotation 21 on the transmission element 4 beyond the control shaft axis of rotation 15.

Mit der Kurbel "a" ist schließlich der Abstand des Krümmungsmittelpunktes der Kurvenbahn bzw. der Drehachse 23 der Rolle 13 des Schwenkhebels 7 von der Drehachse 24 der auf die Rolle 13 über den Nocken 12 einwirkenden Nockenwelle 11 festgelegt. With the crank "a" is finally the distance from the center of curvature of the cam track or the axis of rotation 23 of the roller 13 of the pivot lever 7 from the axis of rotation 24 of the camshaft 11 acting on the roller 13 via the cam 12 established.

Eine mögliche Ausführungsform des Anlenkhebels 16 ist aus Figur 1 ersichtlich, wobei zur einfacheren Montage der obere Teil des Anlenkhebels 16 bügelförmig ausgeführt ist. Er ist auf dem zylindrischen Teil der Steuerwelle 10 kraftschlüssig gehalten, und kann zusätzlich gegen Ablösen gesichert sein.A possible embodiment of the articulation lever 16 can be seen in FIG. 1, the upper part of the articulation lever 16 being bow-shaped for easier assembly is executed. It is non-positive on the cylindrical part of the control shaft 10 held, and can also be secured against detachment.

Vorzugsweise ist der Schwenkhebel 7 über einen gemeinsamen Gelenkbolzen 25 mittels zweier, beabstandet angeordneter, gabelartig gestalteter Anlenkhebel 16 geführt.The pivot lever 7 is preferably via a common hinge pin 25 by means of two spaced-apart, fork-like link levers 16 guided.

Claims (3)

  1. A device for adjusting the stroke of a gas change valve in the cylinder head of an internal combustion engine,
    wherein a transmission element (4) co-operating with the gas change valve (2) is in line contact with a control path (6) comprising an idling-stroke curve (6') and a stroke curve (6") on a rocking lever (7) which
    at its other end (8) is in line contact (at 8') with a cam plate (9) on a control shaft (10) locatable and fixable in the cylinder head (3) in controlled manner, wherein
    a camshaft (11) disposed parallel with the control shaft (10) in the cylinder head (3) acts via a cam (12) on a path (pulley 13) on the rocking lever (7) in order to move the gas change valve in a stroke,
    characterised in that
    the rocking motion (arrow "A") of the lever (7) produced by the cam (12) and a return spring (14) is guided by an articulated lever (16) movable in rotation coaxially with the axis of rotation (15) of the control shaft (10),
    the pivotal point (17) of the articulated lever on the rocking lever (7) being determined by a point of intersection between two circular arcs (K1, K2) around the end points (18, 18') of an imaginary path (19), approximated by a circular arc, of the axis of rotation (15) of the control shaft (10), wherein
    the imaginary path (19) of the axis of rotation (15) of the control shaft, in the case of an imaginary fixed four-bar linkage (a, b, c) with the couple "b" = rocking lever (7) serves as a kinematic equivalent of the actual movement of the cam plate (9) in the idling-stroke curve region,
    the end points (20, 20') of the said curve (6') determining the centres (18, 18') of the arcs of the imaginary path (19).
  2. A device in accordance with claim 1, characterised in that
    a centre (M) of a radius (RLH) of the idling-stroke curve (6') is mapped on the crank "c" of the four-bar linkage (a, b, c) starting from the axis of rotation (21) of a pulley (5) disposed on the transmission element (4), wherein
    when the cam plate (9) moves on a circular arc (22) around the axis of rotation (21) of the pulley on the transmission element (4), the centre (M) moves on the other side of the axis of rotation (15) of the control shaft and
    the crank "a" determines the distance of the centre of curvature of the path (pulley 13) of the rocking lever (7) from the axis of rotation (24) of the camshaft (11) acting on the path (pulley 13) via the cam (12).
  3. A device in accordance with claims 1 and 2, characterised in that each rocking lever (7) is guided by two spaced-apart articulated levers (16) on a common joint pin (25).
EP00104801A 1999-03-26 2000-03-06 Device for modifying the valve lift in an engine cylinder head Expired - Lifetime EP1039103B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19913742 1999-03-26
DE19913742A DE19913742A1 (en) 1999-03-26 1999-03-26 Device for stroke adjustment of a gas exchange valve in the cylinder head of an internal combustion engine

Publications (3)

Publication Number Publication Date
EP1039103A2 EP1039103A2 (en) 2000-09-27
EP1039103A3 EP1039103A3 (en) 2001-09-26
EP1039103B1 true EP1039103B1 (en) 2004-10-13

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EP00104801A Expired - Lifetime EP1039103B1 (en) 1999-03-26 2000-03-06 Device for modifying the valve lift in an engine cylinder head

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EP (1) EP1039103B1 (en)
DE (2) DE19913742A1 (en)
ES (1) ES2224939T3 (en)

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DE10058539C2 (en) * 2000-11-24 2003-07-17 Konrad Harter Maschb Gmbh Assembly tool for a torsion spring and method for assembling such a torsion spring
DE10061618B4 (en) * 2000-12-11 2004-06-03 Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr Device for the variable actuation of valves by means of cams for internal combustion engines
US6955146B2 (en) 2000-12-11 2005-10-18 Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr System for variably actuating valves in internal combustion engines
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
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EP1039103A2 (en) 2000-09-27
ES2224939T3 (en) 2005-03-16
DE19913742A1 (en) 2000-09-28
DE50008179D1 (en) 2004-11-18
EP1039103A3 (en) 2001-09-26

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