EP1387928A1 - Gas driving device for variable adjustment of the lift of a gas exchange valve of an internal combustion engine - Google Patents

Gas driving device for variable adjustment of the lift of a gas exchange valve of an internal combustion engine

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Publication number
EP1387928A1
EP1387928A1 EP02750861A EP02750861A EP1387928A1 EP 1387928 A1 EP1387928 A1 EP 1387928A1 EP 02750861 A EP02750861 A EP 02750861A EP 02750861 A EP02750861 A EP 02750861A EP 1387928 A1 EP1387928 A1 EP 1387928A1
Authority
EP
European Patent Office
Prior art keywords
valve
roller
lever
gas exchange
stroke
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
EP02750861A
Other languages
German (de)
French (fr)
Other versions
EP1387928B1 (en
Inventor
Rudolf Flierl
Michael Allgeier
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 EP1387928A1 publication Critical patent/EP1387928A1/en
Application granted granted Critical
Publication of EP1387928B1 publication Critical patent/EP1387928B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • 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
    • F01L2305/00—Valve arrangements comprising rollers
    • 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

Definitions

  • Valve drive device for variable stroke adjustment of a gas exchange valve of an internal combustion engine
  • the invention relates to a valve train device for variable stroke adjustment of a gas exchange valve of an internal combustion engine, in which the gas exchange valve is in operative connection with the interposition of a transmission element with a roller rotatable about an axis of rotation with a control path comprising an idle stroke curve and a stroke curve in an end region of a stroke - Actuation of the gas exchange valve by a cam of a camshaft-controlled swivel lever, the spring-loaded swivel lever assigned to the cam via a cam track being supported at the other end for variable stroke adjustment via a positionally adjustable and fixable swiveling pivot point along a circular path controlled by an adjusting device.
  • Such a valve train device is known from DE 197 08 484 A1, the pivoting lever in its end region remote from the control path having an arc-shaped toothing for engaging a toothing of a control shaft, which serves as an adjusting device for changing the pivoting position assigned to a specific stroke of the gas exchange valve.
  • the pivot point of the swivel lever results from the point of contact of the pitch circles.
  • valve train device is also known from DE 42 23 172 C1, the pivot lever pivoted from the cam of a camshaft in its free lever end adjacent to the line contact with one of the to achieve a variable stroke - zero stroke to full stroke Stroke-serving cam is guided over a slot on a bolt fixed to the housing.
  • the pivoting lever is subject to a rotational and a translational movement component in its oscillation pivot point, the translational movement component corresponding to the function of a pre-cam or a ramp, but otherwise opposing an increase in the dynamics of the valve train.
  • the invention is based on the object of kinematically developing a pivoting lever for the generic valve drive device in such a way that it enables increased valve train dynamics in the case of a purely rotary movement or pivoting movement.
  • a circular path arranged on a housing part of the internal combustion engine serves as a backdrop with a radius "R" around the axis of rotation of the role of the transmission element of the controlled position-variable support of the pivoting lever, the control path of the pivoting lever in the transition area between Idle stroke curve and stroke curve is formed with a ramp set on a valve clearance in the valve train device.
  • the advantage of the invention is that the pivot point of the pivoting lever forms an invariable instantaneous pole during the stroke actuation for a set valve stroke and thus a translational movement component is advantageously avoided.
  • the Control time when changing the stroke of the gas exchange valve can be shortened to a much greater extent, with delayed opening and closing sections in partial strokes essentially being eliminated.
  • the invention results in a valve train device of high rigidity, which is furthermore advantageous for increased valve acceleration.
  • the valve train device according to the invention enables an actual zero stroke and, at full load, a maximum opening gas exchange valve increases torque combined with high speed stability.
  • the pivot lever at its end remote from the control path is supported against the housing-side circular path or link via a roller that can be rotated about an axis and can be fixed in each case by means of the adjusting device in such a way that it is controlled along an equidistant line from the circular path displaceable axis of the roller forms the swing pivot point of the pivot lever serving the respective variable stroke adjustment.
  • the instantaneous pole or oscillation pivot point is shifted according to the invention into the axis of the circular path roller of the swivel lever a valve train device of reduced wear with much less friction and high functional accuracy, wherein the energy for the adjusting device is also advantageously reduced.
  • a roller rocker arm supported on the housing side via a hydraulic valve lash adjuster is provided as the transmission element, the ramp provided for replacing the translational movement component which has been omitted being designed for an essentially constant stroke speed with a maximum stroke exceeding the greatest possible valve lash.
  • a valve train device 1 is used for variable stroke adjustment of a gas exchange valve 2 of an internal combustion engine, not shown, the gas exchange valve 2 being one of a plurality of identical intake valves of a cylinder of the internal combustion engine, not shown.
  • the gas exchange valve 2 with the interposition of a transmission element 3 with a roller 5 movable about an axis of rotation 4, is operatively connected to a control path 6 comprising an idle stroke curve 6 ′ and a stroke curve 6 ′′, which is in an end region of a for stroke actuation of the gas exchange valve 2 is arranged by a cam 7 'of a camshaft 7-controlled pivot lever 8.
  • the pivot lever 8 which is assigned to the cam 7' without play by means of a spring 9 via a roller 10, is on the other hand for variable stroke adjustment of the gas exchange valve 2 by means of a position-changer controlled by an adjusting device 11 and fixable swing fulcrum 12 supported along a circular path.
  • the spring-loaded pivot lever 8 is remote from its control path
  • a roller 17 which is rotatable about an axis 16, against the circular path 14 or link 15 on the housing side, and can be fixed in each case by means of a cam plate 18 of the adjusting device 11 under the action of the spring 9 such that the along an equidistant line 19 to the circular path 14 or Link 15 controlled displaceable axis 16 of the link-side roller 17 in the respective variable
  • Stroke serving swing pivot 12 of the pivot lever 8 forms. It is advantageously achieved with the invention that the pivot point 12 of the pivot lever 8 forms an unchangeable instantaneous pole for a set, reduced stroke or for each stroke during the respective stroke actuation.
  • the translational movement components of the oscillating lever 8 mentioned in the introduction to the description are omitted.
  • the control path 6 of the swivel lever 8 is designed according to the invention in the transition region between idle stroke curve 6 'and stroke curve 6" with a ramp 20 which is adjusted to a valve clearance in the valve train device 1.
  • valve train device 1 which is embodied kinematically according to the invention, an actual zero stroke of the gas exchange valve 2 can be realized, furthermore there is a greater shortening of the control time when the stroke of the gas exchange valve 2 changes, delayed opening and closing courses during partial strokes are eliminated or significantly reduced, so that a larger maximum valve acceleration can advantageously be achieved. Furthermore, there is also an improved and increased torque curve at the full load of the internal combustion engine.
  • the link roller or circular roller 17 of the pivot lever 8 is arranged on a pin 21 or on a roller bearing on a pivot 21 connected to the pivot lever 8.
  • cam roller 10 of the pivot lever 8 is also needle-bearing, the same applies to the roller 5 of the transmission element 3.
  • a roller rocker arm 23 supported on the housing side via a hydraulic valve lash compensation device 22 is provided as the transmission element 3, the roller 5 of which is connected to a control path 6 of the Swing lever 8 cooperates, which has a ramp 20 designed essentially for a constant lifting speed with a maximum stroke exceeding the greatest possible valve clearance.
  • a cup tappet with a roller is also conceivable as the transmission element 3, and also a rocker arm with a mechanically adjusted valve clearance.

Landscapes

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

Abstract

In a valve-driving device for variable adjustment of the lift of a gas exchange valve of an internal combustion engine, wherein the gas exchange valve co-operates, via a transfer element, with a roller which can move about an axis of rotation, with a control path having an idling lift curve and a lift curve in an end area of a spring-loaded pivoting level which is controlled by a cam associated with a cam shaft in order to actuate the lifting of said gas exchange valve. In order to obtain a pure pivoting movement of the pivoting lever, the pivoting center of motion forms a constant instantaneous center of rotation during any actuation of said lift. In order to prevent an impact arising from the valve clearance, the control path of the pivoting lever comprises a ramp, which is correspondingly adapted to the respective valve clearance, between the idling lift curve and the lift curve.

Description

Ventiltrieb-Vorrichtung zur variablen Hubverstellung eines Gaswechselventils einer BrennkraftmaschineValve drive device for variable stroke adjustment of a gas exchange valve of an internal combustion engine
Die Erfindung bezieht sich auf eine Ventiltrieb-Vorrichtung zur variablen Hubverstellung eines Gaswechselventils einer Brennkraftmaschine, bei der das Gaswechselventil unter Zwischenschaltung eines Übertragungselementes mit einer um eine Drehachse drehbaren Rolle in Wirkverbindung steht mit einer eine Leerhubkurve und eine Hubkurve umfassenden Steuerbahn in einem Endbereich eines zur Hub- betätigung des Gaswechselventiles von einem Nocken einer Nockenwelle gesteuerten Schwenkhebels, wobei der federbelastet über eine Kurvenbahn dem Nocken zugeordnete Schwenkhebel andernends zur variablen Hubverstellung über einen mittels einer Versteileinrichtung gesteuert lageveränderbaren und fixierbaren Schwingdrehpunkt längs einer Kreisbahn abgestützt ist.The invention relates to a valve train device for variable stroke adjustment of a gas exchange valve of an internal combustion engine, in which the gas exchange valve is in operative connection with the interposition of a transmission element with a roller rotatable about an axis of rotation with a control path comprising an idle stroke curve and a stroke curve in an end region of a stroke - Actuation of the gas exchange valve by a cam of a camshaft-controlled swivel lever, the spring-loaded swivel lever assigned to the cam via a cam track being supported at the other end for variable stroke adjustment via a positionally adjustable and fixable swiveling pivot point along a circular path controlled by an adjusting device.
Eine derartige Ventiltrieb-Vorrichtung ist aus der DE 197 08 484 A1 bekannt, wobei der Schwenkhebel in seinem steuerbahnfernen Endbereich eine kreisbogenförmige Verzahnung aufweist zum Eingriff in eine Verzahnung einer Steuerwelle, die als VerStelleinrichtung zur Änderung der einem bestimmten Hub des Gaswechselventils zugeordneten Schwenklage dient. Der Schwingdrehpunkt des Schwenkhebels ergibt sich hierbei im Berührungspunkt der Teilkreise.Such a valve train device is known from DE 197 08 484 A1, the pivoting lever in its end region remote from the control path having an arc-shaped toothing for engaging a toothing of a control shaft, which serves as an adjusting device for changing the pivoting position assigned to a specific stroke of the gas exchange valve. The pivot point of the swivel lever results from the point of contact of the pitch circles.
Mit dieser Anordnung wird beim Einwirken des Nockens einer benachbarten Nockenwelle auf den Schwenkhebel bewirkt, dass dieser sich in der Verzahnung der stillstehenden Steuerwelle abwälzt und dabei neben einer Schwenkbewegung bzw. einer rotatorischen Bewegung in Bezug auf die Rolle des Übertragungselementes auch eine translatorische Bewegungskomponente auftritt mit dem Umstand eines gegenüber dem beabsichtigten Hub veränderten Hubes des Gaswech- selventils.With this arrangement, when the cam of an adjacent camshaft acts on the pivoting lever, this causes it to be in the toothing rolls the stationary control shaft and, in addition to a pivoting movement or a rotational movement with respect to the role of the transmission element, a translational movement component also occurs with the circumstance of a stroke of the gas exchange valve which is changed compared to the intended stroke.
Eine weitere, ähnliche Ventiltrieb-Vorrichtung ist ferner aus der DE 42 23 172 C1 bekannt, wobei 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 ist. Auch bei dieser Führung unterliegt der Schwenkhebel bei einer Hubbetätigung des Gaswechselventils in seinem Schwingdrehpunkt einer rotatorischen sowie einer translatorischen Bewegungskomponente, wobei die translatorische Bewegungskompo- nente der Funktion eines Vornockens bzw. einer Rampe entspricht, ansonsten aber einer Steigerung der Dynamik des Ventiltriebes entgegensteht.Another, similar valve train device is also known from DE 42 23 172 C1, the pivot lever pivoted from the cam of a camshaft in its free lever end adjacent to the line contact with one of the to achieve a variable stroke - zero stroke to full stroke Stroke-serving cam is guided over a slot on a bolt fixed to the housing. With this guidance too, when the gas exchange valve is actuated, the pivoting lever is subject to a rotational and a translational movement component in its oscillation pivot point, the translational movement component corresponding to the function of a pre-cam or a ramp, but otherwise opposing an increase in the dynamics of the valve train.
Der Erfindung liegt die Aufgabe zugrunde, für die gattungsgemäße Ventiltrieb-Vorrichtung einen Schwenkhebel kinematisch derart weiterzubilden, dass dieser bei einer reinen rotatorischen Bewegung bzw. Schwenkbewegung eine gesteigerte Ventiltrieb-Dynamik ermöglicht.The invention is based on the object of kinematically developing a pivoting lever for the generic valve drive device in such a way that it enables increased valve train dynamics in the case of a purely rotary movement or pivoting movement.
Diese Aufgabe ist mit dem Patentanspruch 1 dadurch gelöst, dass eine an einem Gehäuseteil der Brennkraftmaschine angeordnete Kreisbahn als Kulisse mit einem Radius "R" um die Drehachse der Rolle des Übertragungselementes der gesteuert lageveränderbaren Abstützung des Schwenkhebels dient, wobei die Steuerbahn des Schwenkhebels im Übergangsbereich zwischen Leerhubkurve und Hubkurve mit einer auf ein Ventilspiel in der Ventiltrieb-Vorrichtung abgestellten Rampe ausgebildet ist.This object is achieved with claim 1 in that a circular path arranged on a housing part of the internal combustion engine serves as a backdrop with a radius "R" around the axis of rotation of the role of the transmission element of the controlled position-variable support of the pivoting lever, the control path of the pivoting lever in the transition area between Idle stroke curve and stroke curve is formed with a ramp set on a valve clearance in the valve train device.
Mit der Erfindung ist der Vorteil erreicht, dass der Schwingdrehpunkt des Schwenkhebels während der Hubbetätigung für einen eingestellten Ventil-Hub einen unveränderlichen Momentanpol bildet und somit eine translatorische Bewegungskomponente vorteilhafterweise vermieden ist. Auf dieser Basis der Erfindung kann die Steuerzeit bei Hubänderung des Gaswechselventils in wesentlich größerem Umfang verkürzt werden, wobei verschleppte Öffnungs- und Schließabschnitte bei Teilhüben im wesentlichen entfallen. Weiter ergibt die Erfindung eine Ventiltrieb-Vorrichtung von hoher Steifigkeit, die des Weiteren für eine erhöhte Ventilbeschleunigung vor- teilhaft ist. Schließlich ermöglicht die erfindungsgemäße Ventiltrieb-Vorrichtung einen tatsächlichen Nullhub und an der Volllast durch ein maximal öffnendes Gaswechselventil ein gesteigertes Drehmoment verbunden mit einer hohen Drehzahlfestigkeit.The advantage of the invention is that the pivot point of the pivoting lever forms an invariable instantaneous pole during the stroke actuation for a set valve stroke and thus a translational movement component is advantageously avoided. On the basis of the invention, the Control time when changing the stroke of the gas exchange valve can be shortened to a much greater extent, with delayed opening and closing sections in partial strokes essentially being eliminated. Furthermore, the invention results in a valve train device of high rigidity, which is furthermore advantageous for increased valve acceleration. Finally, the valve train device according to the invention enables an actual zero stroke and, at full load, a maximum opening gas exchange valve increases torque combined with high speed stability.
In bevorzugter Ausgestaltung der Erfindung wird weiter vorgeschlagen, dass der Schwenkhebel an seinem steuerbahnfernen Ende über eine um eine Achse drehbewegliche Rolle gegen die gehäuseseitige Kreisbahn bzw. Kulisse abgestützt und mittels der VerStelleinrichtung jeweils derart fixierbar ist, dass die längs einer Äqui- distanten zur Kreisbahn gesteuert verlagerbare Achse der Rolle den der jeweiligen variablen Hubverstellung dienenden Schwingdrehpunkt des Schwenkhebels bildet.In a preferred embodiment of the invention, it is further proposed that the pivot lever at its end remote from the control path is supported against the housing-side circular path or link via a roller that can be rotated about an axis and can be fixed in each case by means of the adjusting device in such a way that it is controlled along an equidistant line from the circular path displaceable axis of the roller forms the swing pivot point of the pivot lever serving the respective variable stroke adjustment.
In Verbindung mit einem weiteren Vorschlag, wonach die Kreisbahn-Rolle des Schwenkhebels auf einem mit dem Schwenkhebel drehfest verbundenen Zapfen nadelgelagert bzw. wälzgelagert angeordnet ist, ergibt sich mit dem erfindungs- gemäß in die Achse der Kreisbahn-Rolle des Schwenkhebels verlagerten Momentanpol bzw. Schwingdrehpunkt eine Ventiltrieb-Vorrichtung von verringerten Verschleiß bei wesentlich geringerer Reibung und hoher Funktionsgenauigkeit, wobei ferner die Energie für die Versteileinrichtung in vorteilhafter Weise reduziert ist.In connection with a further proposal, according to which the circular path roller of the swivel lever is arranged on a pin that is rotatably connected to the swivel lever, or on a roller bearing, the instantaneous pole or oscillation pivot point is shifted according to the invention into the axis of the circular path roller of the swivel lever a valve train device of reduced wear with much less friction and high functional accuracy, wherein the energy for the adjusting device is also advantageously reduced.
Gemäß einer weiteren bevorzugten Ausgestaltung ist als Übertragungselement ein über eine hydraulische Ventilspielausgleichseinrichtung gehäuseseitig abgestützter Rollen-Schlepphebel vorgesehen, wobei die zum Ersatz der entfallenen translatorischen Bewegungskomponente vorgesehene Rampe auf eine im wesentliche konstante Hubgeschwindigkeit ausgelegt ist mit einem das größtmögliche Ventilspiel übersteigenden maximalen Hub.According to a further preferred embodiment, a roller rocker arm supported on the housing side via a hydraulic valve lash adjuster is provided as the transmission element, the ramp provided for replacing the translational movement component which has been omitted being designed for an essentially constant stroke speed with a maximum stroke exceeding the greatest possible valve lash.
Weitere Möglichkeiten zur Gestaltung des Übertragungselementes sind die Ausbildung als ein Tassenstößel mit einer Rolle oder die Ausbildung als ein Schwinghebel mit mechanisch eingestelltem Ventilspiei. Die Erfindung ist anhand eines in der Zeichnung dargestellten Beispiels beschrieben.Further options for designing the transmission element are training as a tappet with a roller or training as a rocker arm with a mechanically adjusted valve mechanism. The invention is described using an example shown in the drawing.
Eine Ventiltrieb-Vorrichtung 1 gemäß der einzigen Figur dient zur variablen Hubverstellung eines Gaswechselventils 2 einer nicht gezeigten Brennkraftmaschine, wobei das Gaswechselventil 2 eines von mehreren, gleichartigen Einlassventilen eines Zylinders der nicht gezeigten Brennkraftmaschine ist. Bei der Ventiltrieb-Vorrichtung 1 steht das Gaswechselventil 2 unter Zwischenschaltung eines Übertragungs- elementes 3 mit einer um eine Drehachse 4 beweglichen Rolle 5 in Wirkverbindung mit einer eine Leerhubkurve 6' und eine Hubkurve 6" umfassenden Steuerbahn 6, die in einem Endbereich eines zur Hubbetätigung des Gaswechselventils 2 von einem Nocken 7' einer Nockenwelle 7 gesteuerten Schwenkhebels 8 angeordnet ist. Der mittels einer Feder 9 über eine Rolle 10 dem Nocken 7' spielfrei zugeordnete Schwenkhebel 8 ist andernends zur variablen Hubverstellung des Gaswechselventils 2 über einen mittels einer Versteileinrichtung 11 gesteuert lageveränderbaren und fixierbaren Schwingdrehpunkt 12 längs einer Kreisbahn abgestützt.A valve train device 1 according to the single figure is used for variable stroke adjustment of a gas exchange valve 2 of an internal combustion engine, not shown, the gas exchange valve 2 being one of a plurality of identical intake valves of a cylinder of the internal combustion engine, not shown. In the valve train device 1, the gas exchange valve 2, with the interposition of a transmission element 3 with a roller 5 movable about an axis of rotation 4, is operatively connected to a control path 6 comprising an idle stroke curve 6 ′ and a stroke curve 6 ″, which is in an end region of a for stroke actuation of the gas exchange valve 2 is arranged by a cam 7 'of a camshaft 7-controlled pivot lever 8. The pivot lever 8, which is assigned to the cam 7' without play by means of a spring 9 via a roller 10, is on the other hand for variable stroke adjustment of the gas exchange valve 2 by means of a position-changer controlled by an adjusting device 11 and fixable swing fulcrum 12 supported along a circular path.
Zur Erzielung einer rein rotatorischen Bewegung bzw. reinen Schwenkbewegung des Schwenkhebels 8 um seinen Schwingdrehpunkt 12 bei einem reduzierten Hub des Gaswechselventils 2 ist erfindungsgemäß eine an einem Gehäuseteil 13 der nicht gezeigten Brennkraftmaschine angeordneten Kreisbahn 14 als Kulisse 15 mit einem Radius "R" um die Drehachse 4 der Rolle 5 des Übertragungselementes 3 zur gesteuert lageveränderbaren Abstützung des Schwenkhebels 8 vorgesehen. Vorzugsweise ist der federbelastete Schwenkhebel 8 an seinem steuerbahnfernenIn order to achieve a purely rotary movement or a pure pivoting movement of the pivot lever 8 about its pivot point 12 with a reduced stroke of the gas exchange valve 2, a circular path 14 arranged on a housing part 13 of the internal combustion engine, not shown, is provided as a backdrop 15 with a radius "R" around the axis of rotation 4 of the roller 5 of the transmission element 3 is provided for controlled, position-changeable support of the pivot lever 8. Preferably, the spring-loaded pivot lever 8 is remote from its control path
Ende über eine um eine Achse 16 drehbewegliche Rolle 17 gegen die gehäuse- seitige Kreisbahn 14 bzw. Kulisse 15 abgestützt und mittels einer Kurvenscheibe 18 der Versteileinrichtung 11 unter Einwirkung der Feder 9 jeweils derart fixierbar, dass die längs einer Äquidistanten 19 zur Kreisbahn 14 bzw. Kulisse 15 gesteuert verla- gerbare Achse 16 der kulissenseitigen Rolle 17 den in der jeweiligen variablenEnd is supported by a roller 17, which is rotatable about an axis 16, against the circular path 14 or link 15 on the housing side, and can be fixed in each case by means of a cam plate 18 of the adjusting device 11 under the action of the spring 9 such that the along an equidistant line 19 to the circular path 14 or Link 15 controlled displaceable axis 16 of the link-side roller 17 in the respective variable
Hubverstellung dienenden Schwingdrehpunkt 12 des Schwenkhebels 8 bildet. Mit der Erfindung ist in vorteilhafter Weise erreicht, dass der Schwingdrehpunkt 12 des Schwenkhebels 8 für einen eingestellten, reduzierten Hub bzw. für jeden Hub während der jeweiligen Hubbetätigung einen unveränderbaren Momentanpol bildet.Stroke serving swing pivot 12 of the pivot lever 8 forms. It is advantageously achieved with the invention that the pivot point 12 of the pivot lever 8 forms an unchangeable instantaneous pole for a set, reduced stroke or for each stroke during the respective stroke actuation.
Mit dem erfindungsgemäß unveränderbaren Momentanpol bzw. Schwingdrehpunkt 12 entfallen die in der Beschreibungseinleitung erwähnten translatorischen Bewegungskomponenten des Schwinghebels 8. Um hierbei einen aus einem Ventilspiel der Ventiltrieb-Vorrichtung 1 herrührenden Stoß beim Übergang der Rolle 5 des Übertragungselementes 3 von der Leerhubkurve 6' zur Hubkurve 6" der Steuerbahn 6 während eines Hubes sicher zu vermeiden, ist die Steuerbahn 6 des Schwenkhebels 8 erfindungsgemäß im Übergangsbereich zwischen Leerhubkurve 6' und Hubkurve 6" mit einer auf ein Ventilspiel in der Ventiltrieb-Vorrichtung 1 abgestellten Rampe 20 ausgebildet.With the instantaneous pole or oscillation pivot point 12, which is unchangeable according to the invention, the translational movement components of the oscillating lever 8 mentioned in the introduction to the description are omitted. In order to avoid a shock resulting from a valve clearance of the valve train device 1 during the transition of the roller 5 of the transmission element 3 from the idle stroke curve 6 'to the stroke curve 6 "To reliably avoid the control path 6 during a stroke, the control path 6 of the swivel lever 8 is designed according to the invention in the transition region between idle stroke curve 6 'and stroke curve 6" with a ramp 20 which is adjusted to a valve clearance in the valve train device 1.
Mit dieser erfindungsgemäß kinematisch durchgebildeten Ventiltrieb-Vorrichtung 1 kann ein tatsächlicher Nullhub des Gaswechselventils 2 verwirklicht werden, weiter ergibt sich eine stärkere Verkürzung der Steuerzeit bei einer Hubänderung des Gaswechselventils 2, verschleppte Öffnungs- und Schließverläufe bei Teilhüben entfallen bzw. reduzieren sich erheblich, so dass eine größere maximale Ventil- beschleunigung vorteilhaft erzielbar ist. Weiter ergibt sich auch ein verbesserter sowie erhöhter Drehmomentverlauf an der Volllast der Brennkraftmaschine.With this valve train device 1, which is embodied kinematically according to the invention, an actual zero stroke of the gas exchange valve 2 can be realized, furthermore there is a greater shortening of the control time when the stroke of the gas exchange valve 2 changes, delayed opening and closing courses during partial strokes are eliminated or significantly reduced, so that a larger maximum valve acceleration can advantageously be achieved. Furthermore, there is also an improved and increased torque curve at the full load of the internal combustion engine.
Zur Reduzierung des Verschleißes in der Ventiltrieb-Vorrichtung 1 ist weiter vorgesehen, dass die Kulissen- bzw. Kreisbahn-Rolle 17 des Schwenkhebels 8 auf einem mit dem Schwenkhebel 8 drehfest verbundenen Zapfen 21 nadelgelagert bzw. wälzgelagert angeordnet ist.In order to reduce the wear in the valve train device 1, it is further provided that the link roller or circular roller 17 of the pivot lever 8 is arranged on a pin 21 or on a roller bearing on a pivot 21 connected to the pivot lever 8.
Wie aus der einzigen Figur ersichtlich, ist ferner die Nocken-Rolle 10 des Schwenkhebels 8 ebenfalls nadelgelagert, gleiches gilt für die Rolle 5 des Übertragungs- elementes 3.As can be seen from the single figure, the cam roller 10 of the pivot lever 8 is also needle-bearing, the same applies to the roller 5 of the transmission element 3.
Wie aus der einzigen Figur weiter ersichtlich, ist als Übertragungselement 3 ein über eine hydraulische Ventilspiel-Ausgleichseinrichtung 22 gehäuseseitig abgestützter Rollen-Schlepphebel 23 vorgesehen, dessen Rolle 5 mit einer Steuerbahn 6 des Schwenkhebels 8 zusammenwirkt, die eine im wesentlichen auf eine konstante Hubgeschwindigkeit ausgelegte Rampe 20 mit einem das größtmögliche Ventilspiel übersteigenden maximalen Hub aufweist.As can further be seen from the single figure, a roller rocker arm 23 supported on the housing side via a hydraulic valve lash compensation device 22 is provided as the transmission element 3, the roller 5 of which is connected to a control path 6 of the Swing lever 8 cooperates, which has a ramp 20 designed essentially for a constant lifting speed with a maximum stroke exceeding the greatest possible valve clearance.
Als Übertragungselement 3 ist auch ein Tassenstößel mit einer Rolle denkbar, ferner auch ein Schwinghebel mit mechanisch eingestelltem Ventilspiel. A cup tappet with a roller is also conceivable as the transmission element 3, and also a rocker arm with a mechanically adjusted valve clearance.

Claims

Patentansprüche claims
1. Ventiltrieb-Vorrichtung zur variablen Hubverstellung eines Gaswechselventils einer Brennkraftmaschine, bei der das Gaswechselventil (2) unter Zwischenschaltung eines Übertragungselementes (3) mit einer um eine Drehachse (4) beweglichen Rolle (5) in Wirkverbindung steht mit einer eine Leerhubkurve (6') und eine Hubkurve (6") umfassenden Steuerbahn (6) in einem Endbereich eines zur Hubbetätigung des Gaswechselventils (2) von einem Nocken (7') einer Nockenwelle (7) gesteuerten Schwenkhebels (8), wobei der federbelastet über eine Kurvenbahn (Nocken-Rolle 10) dem Nocken (7') zugeordnete Schwenkhebel (8) andemends zur variablen Hubverstellung über einen mittels einer VerStelleinrichtung (11 ) gesteuert lageveränderbaren und fixierbaren Schwingdrehpunkt (12) längs einer Kreisbahn abgestützt ist, dadurch gekennzeichnet, dass eine an einem Gehäuseteil (13) der Brennkraftmaschine angeordnete Kreisbahn (14) als Kulisse (15) mit einem Radius (R) um die Drehachse (4) der Rolle (5) des Übertragungselementes (3) der gesteuert lageveränderbaren Abstützung des Schwenkhebels (8) dient, wobei die Steuerbahn (6) des Schwenkhebels (8) im Übergangsbereich zwischen Leerhubkurve (6') und Hubkurve (6") mit einer auf ein Ventilspiel in der Ventiltrieb-Vorrichtung (1) abgestellten Rampe (20) ausgebildet ist.1. Valve drive device for variable stroke adjustment of a gas exchange valve of an internal combustion engine, in which the gas exchange valve (2) is operatively connected to an idle stroke curve (6 ') with a roller (5) movable about an axis of rotation (4) with the interposition of a transmission element (3) ) and a stroke curve (6 ") comprising a control track (6) in an end region of a pivot lever (8) controlled by a cam (7 ') of a camshaft (7) for actuating the gas exchange valve (2), the spring-loaded via a cam track (cam -Roller 10) the cam (7 ') assigned pivot lever (8) is supported at the other end for variable stroke adjustment via an oscillating pivot point (12) which can be adjusted and fixed by means of an adjusting device (11), along a circular path, characterized in that one on a housing part ( 13) the internal combustion engine arranged circular path (14) as a backdrop (15) with a radius (R) around the axis of rotation (4) of the roller (5) of the Ü Transfer element (3) of the controlled position-changeable support of the pivot lever (8) is used, wherein the control path (6) of the swivel lever (8) in the transition area between idle stroke curve (6 ') and stroke curve (6 ") is designed with a ramp (20) which is set up for a valve clearance in the valve train device (1).
2. Vorrichtung nach Anspruch 1 , dadurch gekennzeichnet, dass der federbelastete Schwenkhebel (8) an seinem steuerbahnfernen Ende über eine um eine Achse (16) drehbewegliche Rolle (17) gegen die gehäuseseitige Kreisbahn (14) bzw. Kulisse (15) abge- stützt und mittels der VerStelleinrichtung (11) jeweils derart fixierbar ist, dass die längs einer Äquidistanten (19) zur Kreisbahn (14) gesteuert verlagerbare Achse (16) der kulissenseitigen Rolle (17) den der jeweiligen variablen Hubverstellung dienenden Schwingdrehpunkt (12) des Schwenkhebels (8) bildet.2. Device according to claim 1, characterized in that the spring-loaded pivot lever (8) is supported at its end remote from the control path via a roller (17) rotatable about an axis (16) against the circular path (14) or link (15) on the housing and can be fixed in each case by means of the adjusting device (11) in such a way that the axis (16) of the link-side roller (17), which can be displaced along an equidistant (19) to the circular path (14), controls the pivot point (12) of the swivel lever (12) which serves for the respective variable stroke adjustment. 8) forms.
3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass die Kulissenbzw. Kreisbahn-Rolle (17) des Schwenkhebels (8) auf einem mit dem Schwenkhebel (8) drehfest verbundenen Zapfen (21 ) nadelgelagert bzw. wälzgelagert angeordnet ist.3. Device according to claim 2, characterized in that the scenery or. Circular path roller (17) of the pivoting lever (8) is arranged on a pin (21) or roller bearing on a pin (21) connected in a rotationally fixed manner to the pivoting lever (8).
4. Vorrichtung nach einem oder mehreren der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass als Übertragungselement (3) ein über eine hydraulische Ventil- spiel-Ausgleichseinrichtung (22) gehäuseseitig abgestützter Rollen-4. Device according to one or more of claims 1 to 3, characterized in that as a transmission element (3) via a hydraulic valve lash compensation device (22) supported on the housing side roller
Schlepphebel (23) vorgesehen ist, und dass die im wesentlichen auf eine konstante Hubgeschwindigkeit ausgelegte Rampe (20) der Steuerbahn (6) einen das größtmögliche Ventilspiel übersteigenden maximalen Hub aufweist.Rocker arm (23) is provided, and that the ramp (20) of the control track (6), which is designed essentially for a constant lifting speed, has a maximum stroke that exceeds the greatest possible valve clearance.
5. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass als Übertragungselement (3) ein Tassenstößel mit einer Rolle dient. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass als Übertragungselement (3) ein Ventilhebel mit mechanisch eingestelltem Ventilspiel dient. 5. Device according to one of claims 1 to 3, characterized in that a tappet with a roller serves as the transmission element (3). Device according to one of claims 1 to 3, characterized in that a valve lever with a mechanically adjusted valve clearance is used as the transmission element (3).
EP02750861A 2001-05-12 2002-04-19 Gas driving device for variable adjustment of the lift of a gas exchange valve of an internal combustion engine Expired - Lifetime EP1387928B1 (en)

Applications Claiming Priority (3)

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DE10123186A DE10123186A1 (en) 2001-05-12 2001-05-12 Valve gear device for variable lift adjustment is for gas exchange valve of internal combustion engine and has valve vai intermediary of transmission component effectively connected to roller movable around rotary axis
DE10123186 2001-05-12
PCT/EP2002/004332 WO2002092972A1 (en) 2001-05-12 2002-04-19 Gas driving device for variable adjustment of the lift of a gas exchange valve of an internal combustion engine

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EP (1) EP1387928B1 (en)
JP (1) JP2004521234A (en)
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WO2002092972A1 (en) 2002-11-21
ES2266537T3 (en) 2007-03-01
US6907852B2 (en) 2005-06-21
DE50207568D1 (en) 2006-08-31
ATE333571T1 (en) 2006-08-15
US20040144347A1 (en) 2004-07-29
JP2004521234A (en) 2004-07-15

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