EP3011148B1 - Method for producing same valve lifts in a variable valve train - Google Patents

Method for producing same valve lifts in a variable valve train Download PDF

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Publication number
EP3011148B1
EP3011148B1 EP14708531.0A EP14708531A EP3011148B1 EP 3011148 B1 EP3011148 B1 EP 3011148B1 EP 14708531 A EP14708531 A EP 14708531A EP 3011148 B1 EP3011148 B1 EP 3011148B1
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EP
European Patent Office
Prior art keywords
valve
control shaft
gas exchange
strokes
trains
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EP14708531.0A
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German (de)
French (fr)
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EP3011148A1 (en
Inventor
Libor SNASEL
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Pierburg GmbH
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Pierburg GmbH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0063—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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B19/00—Single-purpose machines or devices for particular grinding operations not covered by any other main group
    • B24B19/08—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding non-circular cross-sections, e.g. shafts of elliptical or polygonal cross-section
    • B24B19/12—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding non-circular cross-sections, e.g. shafts of elliptical or polygonal cross-section for grinding cams or camshafts
    • 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
    • F01L2820/00—Details on specific features characterising valve gear arrangements
    • F01L2820/04—Sensors
    • F01L2820/045—Valve lift

Definitions

  • the invention relates to a method for the production of valve synchronizing strokes on variable valve drives, wherein a control shaft to be machined is inserted into a grinding machine and the camshaft cam are ground off according to stored values (see EP-1431525 ).
  • Control shafts are used in variable valve trains, as have become known for example under the terms univalve or valvetronic, to change the valve lift curve.
  • cams are arranged on the control shafts, which abut against rollers of a rocker arm, which performs a modified tilting movement depending on the position of the cam of the control shaft.
  • control shafts must, in order to ensure a Gleichhub all valves of an internal combustion engine, as well as the cooperating intermediate lever and roller rocker arms are classified, so the accuracy of their production are checked. This requires a lot of effort.
  • accurate manufacturing tolerances especially in the grinding of the cam of the control shaft, the proportion of components that are not manufactured sufficiently accurate, relatively large, so that an increased committee arises or post-processing is required.
  • the total existing in the motion strand tolerances despite adhering to individual tolerances, especially in the tolerance chain control shaft, intermediate lever and roller cam followers can add up significantly, which can lead to unequal valve lifts the individual valves built.
  • the disadvantage is thus the high cost of the classification of the items and the high cost of rework or re-production due to cumulative tolerances noticeable.
  • the respective control shaft and the associated intermediate lever and roller cam followers are unambiguously associated with one another for further installation. This prevents confusion of the coordinated components.
  • the characteristic field is determined by tests with reference intermediate levers and reference roller towing levers. These reference intermediate levers and reference roller follower levers, as well as the reference camshaft and the reference control shaft, are fully measured and correspondingly have dimensions corresponding to the optimum components. With these components, it can be determined by experiments for which modified control shaft diameter, which valve lift changes follow. In this way, the required characteristic is determined in advance.
  • Reference valves for measuring are preferably arranged in the measuring device. Since the largest deviations occur due to tolerances on the levers and the control shaft, the use of reference valves, the effort in preparing for the measurement is kept low, since always the same valves can be used for many consecutive measurements.
  • the measurement is performed in a defined reference position of the reference control shaft.
  • the reference control shaft can be inserted so firmly into the measuring device.
  • the reference position of the reference control shaft is the position in which this causes a minimum stroke of the valves. Accordingly, the adjustment is made again in the most critical operating point, as unequal valve strokes have undesirable consequences, especially in operating conditions with low valve strokes. This in turn improves the accuracy of the adjustment.
  • valve Gleichh is thus a method for producing valve Gleichh Wegney
  • variable valve trains created by internal combustion engines with the greatest possible tolerances of the valve strokes of all valves of an engine, especially in the range of small required valve strokes, is still ensured.
  • Classification is no longer required. Additional components compared to the usual methods are not needed.
  • the scrap or the necessary post-processing of components is significantly reduced, so that a higher process stability is present. It can be created in a cost effective manner, a variable valve train, with a smooth running of the motor is ensured.
  • Figure 1 shows a schematic representation of the measurement and the following processing.
  • the inventive method uses a measuring device 10, in which a reference camshaft 12, a reference control shaft 14 and four reference scenes 16 inserted in the present embodiment are. Furthermore, there are 10 receptacles for eight reference gas exchange valves 18 in the measuring device.
  • the measuring device 10 has a measuring probe 20 for each gas exchange valve 18, via which the deflection of each gas exchange valve 18 in the measuring device 10 can be measured from a reference zero point.
  • the probes 20 are connected via a data cable 22 to a control unit 24, which is either connected to a CNC Schlofmaschine 26 via another data cable 22 or integrated in the CNC grinding machine 26.
  • variable valve train in the measuring device 10 is completed by four intermediate lever 28 and eight roller rocker arms 30 are inserted into the measuring device 10 and loaded by four double torsion springs 32 in a known manner against the reference gate 16, the reference camshaft 12 and the reference control shaft 14, so that a complete valve train is created.
  • control shaft 34 to be machined with control shaft cams 36, which interact with the intermediate levers 28, is inserted into the grinding machine 26.
  • the control shaft 34 to be processed as well as the intermediate levers 28 and the roller rocker arms 10 are later installed together in an internal combustion engine and were exactly at the positions where they are arranged in the measuring device 10 and cooperate.
  • the components are marked accordingly, for example by matrix lasers.
  • the measurement process starts by turning the reference camshaft 12 once or several times. This rotation results in a valve lift on each individual reference gas exchange valve 18, which is picked up by the probes 20 and passed on to the control unit 24 via the data cable 22.
  • the reference control shaft 14 is in the rotational position in which it causes the smallest valve lift.
  • the reference gas exchange valve 18 is determined with the smallest valve lift and the valve lift differences .DELTA.x this reference gas exchange valve 18 is calculated to all other reference gas exchange valves 18.
  • This valve lift difference .DELTA.x corresponds in each case to a center distance difference .DELTA.d in comparison to a nominal dimension of the control shaft 34.
  • the corresponding characteristic curve is previously determined by means of tests with reference intermediate levers and reference roller follower levers, so that this determined ⁇ x / ⁇ d characteristic can be stored in the control unit 24.
  • the CNC grinding machine 26 now processes the control shaft 34 to be machined so that the portions of the control shaft 34, which cooperate with a gas exchange valve 18, so the control cam 36, which do not have the smallest valve lift, not only ground to nominal size, but in addition to the calculated center distance difference ⁇ d.
  • the intermediate and roller rocker arms can be manufactured with less exact tolerances, which significantly reduces manufacturing costs. Nevertheless, a Ventilretehub is achieved, resulting in a much quieter engine running. The adjustment to these smallest valve strokes is performed, since in this area the largest differences in volume flow occur with small valve lift differences, causing the uneven running of the engine.

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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 betrifft ein Verfahren zur Herstellung von Ventilgleichhüben an variablen Ventiltrieben, wobei eine zu bearbeitende Steuerwelle in eine Schleifmaschine eingelegt wird und die Steuerwellennocken entsprechend hinterlegter Werte abgeschliffen werden (siehe EP-1431525 ).The invention relates to a method for the production of valve synchronizing strokes on variable valve drives, wherein a control shaft to be machined is inserted into a grinding machine and the camshaft cam are ground off according to stored values (see EP-1431525 ).

Steuerwellen werden bei variablen Ventiltrieben, wie sie beispielsweise unter den Begriffen univalve oder valvetronic bekannt geworden sind, verwendet, um die Ventilhubkurve zu ändern. Hierzu sind auf den Steuerwellen Nocken angeordnet, die gegen Rollen eines Kipphebels anliegen, der je nach Stellung des Nockens der Steuerwelle eine geänderte Kippbewegung durchführt.Control shafts are used in variable valve trains, as have become known for example under the terms univalve or valvetronic, to change the valve lift curve. For this purpose, cams are arranged on the control shafts, which abut against rollers of a rocker arm, which performs a modified tilting movement depending on the position of the cam of the control shaft.

Diese Steuerwellen müssen, um einen Gleichhub aller Ventile eines Verbrennungsmotors sicherzustellen, ebenso wie die mit ihnen zusammenwirkenden Zwischenhebel und Rollenschlepphebel klassifiziert werden, also die Genauigkeit ihrer Fertigung überprüft werden. Dies erfordert einen hohen Aufwand. Trotz genauer Fertigungstoleranzen vor allem bei der Schleifbearbeitung der Nocken der Steuerwelle ist der Anteil der Bauteile, welche nicht ausreichend genau hergestellt sind, relativ groß, so dass ein erhöhter Ausschuss entsteht beziehungsweise eine Nachbearbeitung erforderlich wird. Des Weiteren kommt hinzu, dass sich die im Bewegungsstrang insgesamt vorhandenen Toleranzen trotz eingehaltener Einzeltoleranzen vor allem in der Toleranzkette Steuerwelle, Zwischenhebel und Rollenschlepphebel entscheidend aufsummieren können, was zu ungleichen Ventilhüben der einzelnen verbauten Ventile führen kann.These control shafts must, in order to ensure a Gleichhub all valves of an internal combustion engine, as well as the cooperating intermediate lever and roller rocker arms are classified, so the accuracy of their production are checked. This requires a lot of effort. Despite accurate manufacturing tolerances, especially in the grinding of the cam of the control shaft, the proportion of components that are not manufactured sufficiently accurate, relatively large, so that an increased committee arises or post-processing is required. In addition, in addition, the total existing in the motion strand tolerances despite adhering to individual tolerances, especially in the tolerance chain control shaft, intermediate lever and roller cam followers can add up significantly, which can lead to unequal valve lifts the individual valves built.

Dies macht sich vor allem im Bereich kleiner Ventilhübe bemerkbar, wo ein Gleichhub für einen gleichförmigen Rundlauf des Verbrennungsmotors unerlässlich ist, da in diesem Bereich geringe Abweichungen im Ventilhub zu großen Abweichungen der angesaugten Luftmenge führen.This is particularly noticeable in the area of small valve strokes, where a constant lift is essential for a uniform concentricity of the internal combustion engine, since in this area small deviations in the valve lift lead to large deviations of the intake air volume.

Nachteilig macht sich somit der hohe Aufwand für die Klassifizierung der Einzelteile sowie die hohen Kosten für Nachbearbeitung oder erneute Herstellung aufgrund sich aufsummierender Toleranzen bemerkbar.The disadvantage is thus the high cost of the classification of the items and the high cost of rework or re-production due to cumulative tolerances noticeable.

Es stellt sich daher die Aufgabe, ein Verfahren zur Herstellung von Ventilgleichhüben an variablen Ventiltrieben zu schaffen, mit dem auf eine Klassifizierung der einzelnen Bauteile möglichst verzichtet werden kann und eine im Vergleich zu bislang verwendeten Verfahren deutlich verbesserte Gleichförmigkeit der Ventilhübe der einzelnen Gaswechselventile am fertigen Motor bei variablen Ventiltrieben zumindest im Bereich kleiner geforderter Ventilhübe sichergestellt wird.It is therefore an object to provide a method for producing valve Gleichhüben to variable valve trains, which can be dispensed with a classification of the individual components as possible and significantly improved compared to previously used method uniformity of the valve lifts the individual gas exchange valves on the finished engine is ensured at variable valve trains at least in the range of small required valve strokes.

Diese Aufgabe wird durch ein Verfahren zur Herstellung von Ventilgleichhüben an variablen Ventiltrieben mit den Merkmalen des Hauptanspruchs gelöst.This object is achieved by a method for producing valve Gleichhüben to variable valve trains with the features of the main claim.

Dadurch, dass einzubauende Zwischenhebel und Rollenschlepphebel in eine Messvorrichtung, in der eine Referenznockenwelle und eine Referenzsteuerwelle sowie Referenzkulissen angeordnet sind, eingelegt werden; daraufhin die resultierenden Ventilhübe bei einer Drehung der Referenznockenwelle in der Messvorrichtung gemessen werden und das Gaswechselventil mit dem kleinsten Ventilhub bestimmt wird, woraufhin die Ventilhubdifferenz zwischen dem Gaswechselventil mit dem kleinsten Ventilhub und dem jeweiligen Ventilhub jedes anderen Gaswechselventils gemessen wird und die einzelnen Ventilhubdifferenzen in Achsabstandsdifferenzen der Steuerwelle über ein Kennfeld, welches eine Ventilhubdifferenz eines Gaswechselventils einer Achsabstandsdifferenz einer Steuerwelle zuordnet, umgerechnet werden, um abschließend den dem Gaswechselventil mit dem kleinsten Ventilhub zuzuordnende Steuerwellennocken auf Nennmaß abzuschleifen und die anderen Steuerwellennocken auf das Nennmaß gemindert um die jeweilige über das Kennfeld ermittelte Achsabstandsdifferenz der Steuerwelle des jeweiligen zugeordneten Gaswechselventils abzuschleifen, kann auf eine Klassifizierung verzichtet werden, da sich aufsummierende Toleranzen durch die mechanische Bearbeitung der Steuerwelle ausgeglichen werden. Durch diese Bearbeitung der Steuerwelle werden alle sich aufsummierenden Toleranzen der Kette Steuerwelle, Zwischenhebel und Rollenschlepphebel ausgeglichen und an den kleinsten vorhandenen Ventilhub angepasst, der im Folgenden, nach Einbau der Bauteile in den Verbrennungsmotor dem kleinsten Ventilhub aller Ventile entspricht. Dieser Ausgleich findet dort statt, wo der Einfluss auf den Ventilhub besonders hoch ist.Characterized in that to be installed intermediate lever and roller rocker arm in a measuring device in which a reference camshaft and a reference control shaft and reference scenes are arranged, are inserted; then the resulting valve lifts are measured with a rotation of the reference camshaft in the measuring device and the gas exchange valve is determined with the smallest valve lift, whereupon the valve lift difference between the gas exchange valve with the smallest valve lift and the respective valve lift of each gas exchange valve is measured and the individual valve lift differences in Achsabstandsdifferenzen the Control shaft via a map, which is a valve lift difference of a gas exchange valve of a center distance difference assigns a control shaft to be converted to finally grind the the gas exchange valve to be assigned to the smallest valve lift camshaft cam to nominal size and reduced the other camshaft cam to the nominal reduced by the respective determined via the map distance difference of the control shaft of the respective associated gas exchange valve, can dispense with a classification be, since accumulating tolerances are compensated by the mechanical processing of the control shaft. Through this processing of the control shaft all aufummierenden tolerances of the chain control shaft, intermediate lever and roller rocker arms are balanced and adapted to the smallest existing valve lift, which corresponds below, after installation of the components in the engine the smallest valve lift of all valves. This compensation takes place where the influence on the valve lift is particularly high.

Vorzugsweise werden die jeweilige Steuerwelle und die zugehörigen Zwischenhebel und Rollenschlepphebel zum weiteren Verbau einander eindeutig zugeordnet. Dies verhindert Verwechslungen der aufeinander abgestimmten Bauteile.Preferably, the respective control shaft and the associated intermediate lever and roller cam followers are unambiguously associated with one another for further installation. This prevents confusion of the coordinated components.

In einem bevorzugten Verfahren wird das Kennfeld durch Versuche mit Referenzzwischenhebeln und Referenzrollenschlepphebeln ermittelt. Diese Referenzzwischenhebeln und Referenzrollenschlepphebeln sind ebenso wie die Referenznockenwelle und die Referenzsteuerwelle vollständig vermessen und weisen entsprechend Abmessungen auf, die den optimalen Bauteilen entsprechen. Mit diesen Bauteilen, lässt sich durch Versuche ermitteln, für welche geänderten Steuerwellendurchmesser, welche Ventilhubänderungen folgen. Auf diese Weise wird die benötigte Kennlinie im Vorfeld ermittelt.In a preferred method, the characteristic field is determined by tests with reference intermediate levers and reference roller towing levers. These reference intermediate levers and reference roller follower levers, as well as the reference camshaft and the reference control shaft, are fully measured and correspondingly have dimensions corresponding to the optimum components. With these components, it can be determined by experiments for which modified control shaft diameter, which valve lift changes follow. In this way, the required characteristic is determined in advance.

Dabei ist es vorteilhaft, wenn das Kennfeld in einer Steuereinheit der Schleifmaschine hinterlegt wird, so dass keine zusätzlichen Steuerungen verwendet werden müssen.It is advantageous if the map is stored in a control unit of the grinding machine, so that no additional controls must be used.

Dies ist auf einfache Weise möglich, wenn als Schleifmaschine eine CNC-Maschine verwendet wird, welche ohnehin auf elektronisch gespeicherte Daten zurückgreift. Des Weiteren ist mit einer solchen Maschine eine automatisierte Bearbeitung möglich.This is possible in a simple manner if a CNC machine is used as the grinding machine, which in any case uses electronically stored data. Furthermore, automated processing is possible with such a machine.

Vorzugsweise sind in der Messvorrichtung Referenzventile zur Messung angeordnet. Da die größten Abweichungen aufgrund von Toleranzen an den Hebeln und der Steuerwelle entstehen, wird durch die Verwendung von Referenzventilen der Aufwand bei der Vorbereitung zur Messung gering gehalten, da immer die gleichen Ventile für viele aufeinander folgende Messungen genutzt werden können.Reference valves for measuring are preferably arranged in the measuring device. Since the largest deviations occur due to tolerances on the levers and the control shaft, the use of reference valves, the effort in preparing for the measurement is kept low, since always the same valves can be used for many consecutive measurements.

Alternativ ist es möglich, jeweils den Zwischenhebeln und Rollenschlepphebeln zugeordnete einzubauende Ventile in die Messvorrichtung einzulegen. Auf diese Weise wird eine noch höhere Genauigkeit bezüglich des Ventilgleichhubes erzielt, da eine weitere Komponente, welche Toleranzen bei der Herstellung unterworfen ist, als Fehlerquelle entfällt.Alternatively, it is possible to insert in each case the intermediate levers and Rollenschlepphebeln associated valves to be installed in the measuring device. In this way, an even higher accuracy is achieved in terms of Ventilgleichhubes, since a further component, which is subject to tolerances in the production, is omitted as a source of error.

Vorteilhafterweise wird die Messung in einer definierten Referenzposition der Referenzsteuerwelle durchgeführt. Die Referenzsteuerwelle kann so fest in die Messvorrichtung eingelegt werden.Advantageously, the measurement is performed in a defined reference position of the reference control shaft. The reference control shaft can be inserted so firmly into the measuring device.

In einem hierzu weiterführenden Verfahren ist die Referenzposition der Referenzsteuerwelle die Position, in der diese einen Minimalhub der Ventile verursacht. Entsprechend wird die Anpassung erneut in dem kritischsten Betriebspunkt vorgenommen, da ungleiche Ventilhübe vor allem in Betriebszuständen mit geringen Ventilhüben unerwünschte Folgen haben. Dies verbessert wiederum die Genauigkeit der Einstellung.In a further method, the reference position of the reference control shaft is the position in which this causes a minimum stroke of the valves. Accordingly, the adjustment is made again in the most critical operating point, as unequal valve strokes have undesirable consequences, especially in operating conditions with low valve strokes. This in turn improves the accuracy of the adjustment.

Des Weiteren ist es vorteilhafterweise möglich, zum Abgleich der von der Messvorrichtung gemessenen Daten mehrere Messungen in verschiedenen definierten Stellungen der Referenzsteuerwelle vorzunehmen. Entsprechend können Messfehler ermittelt werden und so sichergestellt werden, dass der Ausschuss durch falsche Bearbeitung der Steuerwelle minimiert wird. Des Weiteren wäre es möglich, die Nocken der Steuerwelle über ihren Umfang, falls erforderlich, unterschiedlich zu bearbeiten, indem die Ergebnisse mehrerer Positionen aufgenommen werden und dementsprechend die Steuerwelle abgeschliffen wird.Furthermore, it is advantageously possible to perform several measurements in different defined positions of the reference control shaft for the purpose of adjusting the data measured by the measuring device. Accordingly, measurement errors can be determined and thus ensured that the waste is minimized by incorrect processing of the control shaft. Further, it would be possible to machine differently the cams of the control shaft over their circumference, if necessary, by taking the results of a plurality of positions and accordingly grinding the control shaft.

Es wird somit ein Verfahren zur Herstellung von Ventilgleichhüben an variablen Ventiltrieben von Verbrennungskraftmaschinen geschaffen, mit dem auch bei größeren verwendeten Toleranzen dennoch eine weitestgehende Gleichheit der Ventilhübe aller Ventile eines Motors, insbesondere im Bereich kleiner geforderter Ventilhübe, sichergestellt wird. Eine Klassifizierung ist nicht mehr erforderlich. Zusätzliche Bauteile im Vergleich zu den sonst üblichen Verfahren werden nicht benötigt. Der Ausschuss oder die notwendige Nachbearbeitung von Bauteilen wird deutlich verringert, so dass eine höhere Prozessstabilität vorliegt. Es kann auf kostengünstige Weise ein variabler Ventiltrieb geschaffen werden, mit dem ein gleichmäßiger Lauf des Motors sichergestellt ist.It is thus a method for producing valve Gleichhüben on variable valve trains created by internal combustion engines, with the greatest possible tolerances of the valve strokes of all valves of an engine, especially in the range of small required valve strokes, is still ensured. Classification is no longer required. Additional components compared to the usual methods are not needed. The scrap or the necessary post-processing of components is significantly reduced, so that a higher process stability is present. It can be created in a cost effective manner, a variable valve train, with a smooth running of the motor is ensured.

Das erfindungsgemäße Verfahren wird anhand der Figuren im Folgenden beschrieben.The method according to the invention will be described below with reference to the figures.

Figur 1 zeigt eine schematische Darstellung der Messung sowie der folgenden Bearbeitung.Figure 1 shows a schematic representation of the measurement and the following processing.

Das erfindungsgemäße Verfahren nutzt eine Messvorrichtung 10, in welche eine Referenznockenwelle 12, eine Referenzsteuerwelle 14 sowie im vorliegenden Ausführungsbeispiel vier Referenzkulissen 16 eingelegt sind. Des Weiteren befinden sich in der Messvorrichtung 10 Aufnahmen für acht Referenzgaswechselventile 18.The inventive method uses a measuring device 10, in which a reference camshaft 12, a reference control shaft 14 and four reference scenes 16 inserted in the present embodiment are. Furthermore, there are 10 receptacles for eight reference gas exchange valves 18 in the measuring device.

Diese Referenzbauteile 12, 14, 16, 18 sind jeweils vermessen worden und befinden sich möglichst exakt im mittleren Toleranzbereich, so dass sie exakt die Auslegungsabmessungen aufweisen.These reference components 12, 14, 16, 18 have each been measured and are located as accurately as possible in the middle tolerance range, so that they have exactly the design dimensions.

Die Messvorrichtung 10 weist für jedes Gaswechselventil 18 einen Messtaster 20 auf, über den die Auslenkung jedes Gaswechselventils 18 in der Messvorrichtung 10 von einem Referenznullpunkt aus gemessen werden kann.The measuring device 10 has a measuring probe 20 for each gas exchange valve 18, via which the deflection of each gas exchange valve 18 in the measuring device 10 can be measured from a reference zero point.

Die Messtaster 20 sind über ein Datenkabel 22 mit einer Steuereinheit 24 verbunden, die entweder mit einer CNC-Schlelfmaschine 26 über ein weiteres Datenkabel 22 verbunden ist oder in der CNC-Schleifmaschine 26 integriert ist.The probes 20 are connected via a data cable 22 to a control unit 24, which is either connected to a CNC Schlofmaschine 26 via another data cable 22 or integrated in the CNC grinding machine 26.

Im Folgenden wird der variable Ventiltrieb in der Messvorrichtung 10 vervollständigt, indem vier Zwischenhebel 28 und acht Rollenschlepphebel 30 in die Messvorrichtung 10 eingesetzt werden und mittels vier Doppelschenkelfedern 32 entsprechend in bekannter Weise gegen die Referenzkulisse 16, die Referenznockenwelle 12 und die Referenzsteuerwelle 14 belastet werden, so dass ein vollständiger Ventiltrieb geschaffen wird.In the following, the variable valve train in the measuring device 10 is completed by four intermediate lever 28 and eight roller rocker arms 30 are inserted into the measuring device 10 and loaded by four double torsion springs 32 in a known manner against the reference gate 16, the reference camshaft 12 and the reference control shaft 14, so that a complete valve train is created.

Des Weiteren wird in die Schleifmaschine 26 eine zu bearbeitende Steuerwelle 34 mit Steuerwellennocken 36, welche mit den Zwischenhebeln 28 zusammenwirken, eingelegt. Die zu bearbeitende Steuerwelle 34 sowie die Zwischenhebel 28 und die Rollenschlepphebel 10 werden später gemeinsam in einen Verbrennungsmotor eingebaut und war exakt an den Positionen, an denen sie in der Messvorrichtung 10 angeordnet sind und zusammenwirken. Hierzu werden die Bauteile entsprechend markiert, beispielsweise durch Matrix-Lasern.Furthermore, a control shaft 34 to be machined with control shaft cams 36, which interact with the intermediate levers 28, is inserted into the grinding machine 26. The control shaft 34 to be processed as well as the intermediate levers 28 and the roller rocker arms 10 are later installed together in an internal combustion engine and were exactly at the positions where they are arranged in the measuring device 10 and cooperate. For this purpose, the components are marked accordingly, for example by matrix lasers.

Im Folgenden beginnt der Messvorgang, indem die Referenznockenwelle 12 einmal oder mehrmals gedreht wird. Diese Drehung hat einen Ventilhub an jedem einzelnen Referenzgaswechselventil 18 zur Folge, der über die Messtaster 20 aufgenommen wird und über das Datenkabel 22 an die Steuereinheit 24 weitergegeben wird. Die Referenzsteuerwelle 14 befindet sich in der Drehstellung, in der sie den kleinsten Ventilhub verursacht. Im Folgenden wird das Referenzgaswechselventil 18 mit dem kleinsten Ventilhub bestimmt und die Ventilhubdifferenzen Δx dieses Referenzgaswechselventils 18 zu allen anderen Referenzgaswechselventilen 18 berechnet.In the following, the measurement process starts by turning the reference camshaft 12 once or several times. This rotation results in a valve lift on each individual reference gas exchange valve 18, which is picked up by the probes 20 and passed on to the control unit 24 via the data cable 22. The reference control shaft 14 is in the rotational position in which it causes the smallest valve lift. In the following, the reference gas exchange valve 18 is determined with the smallest valve lift and the valve lift differences .DELTA.x this reference gas exchange valve 18 is calculated to all other reference gas exchange valves 18.

Diese Ventilhubdifferenz Δx entspricht jeweils einer Achsabstandsdifferenz Δd im Vergleich zu einem Nennmaß der Steuerwelle 34. Die entsprechende Kennlinie wird zuvor mittels Versuchen mit Referenzzwischenhebeln und Referenzrollenschlepphebeln ermittelt, so dass diese ermittelte Δx/Δd-Kennlinie in der Steuereinheit 24 hinterlegt werden kann.This valve lift difference .DELTA.x corresponds in each case to a center distance difference .DELTA.d in comparison to a nominal dimension of the control shaft 34. The corresponding characteristic curve is previously determined by means of tests with reference intermediate levers and reference roller follower levers, so that this determined Δx / Δd characteristic can be stored in the control unit 24.

Die CNC-Schleifmaschine 26 bearbeitet nun die zu bearbeitende Steuerwelle 34 derart, dass die Abschnitte der Steuerwelle 34, die mit einem Gaswechselventil 18 zusammenwirken, also die Steuerwellennocken 36, welche nicht den kleinsten Ventilhub aufweisen, nicht nur auf Nennmaß abgeschliffen werden, sondern zusätzlich um die ermittelte Achsabstandsdifferenz Δd.The CNC grinding machine 26 now processes the control shaft 34 to be machined so that the portions of the control shaft 34, which cooperate with a gas exchange valve 18, so the control cam 36, which do not have the smallest valve lift, not only ground to nominal size, but in addition to the calculated center distance difference Δd.

Dies hat zur Folge, dass beim Zusammenbau des variablen Ventiltriebs mit den Zwischenhebeln 28, den Rollenschlepphebeln 30 entsprechend Ihrer Position in der Messvorrichtung 10 und der so bearbeiteten Steuerwelle 34 ein gleicher Ventilhub für alle Ventile erzielt wird, da die Toleranzfehler der Bauteile durch die entsprechende Bearbeitung der verwendeten Steuerwelle 34 ausgeglichen werden.This has the consequence that when assembling the variable valve train with the intermediate levers 28, the Rollenschlepphebeln 30 according to their position in the measuring device 10 and the thus processed control shaft 34 an equal valve lift for all valves is achieved, since the tolerance error of the components by the corresponding processing the control shaft 34 used are compensated.

Entsprechend können die Zwischen- und Rollenschlepphebel mit weniger exakten Toleranzen hergestellt werden, wodurch Herstellkosten deutlich reduziert werden. Dennoch wird ein Ventilgleichhub erreicht, was zu einem deutlich ruhigeren Motorlauf führt. Der Abgleich zu diesen kleinsten Ventilhüben wird durchgeführt, da in diesem Bereich die größten Volumenstrorndifferenzen bei geringen Ventilhubdifferenzen auftreten, was den ungleichmäßigen Lauf des Motors verursacht.Accordingly, the intermediate and roller rocker arms can be manufactured with less exact tolerances, which significantly reduces manufacturing costs. Nevertheless, a Ventilgleichhub is achieved, resulting in a much quieter engine running. The adjustment to these smallest valve strokes is performed, since in this area the largest differences in volume flow occur with small valve lift differences, causing the uneven running of the engine.

Selbstverständlich wäre es auch möglich, die Messung in anderen Stellungen der Referenzsteuerwelle 14 vorzunehmen, da die Hauptdifferenzen im Ventilhub aufgrund der Zwischenhebel und Rollenschlepphebel auftreten. Auch ist es denkbar, in mehreren Stellungen der Referenzsteuerwelle derartige Messungen durchzuführen oder die Ventilhübe bei einer Drehung der Referenzsteuerwelle zu messen und die Nockenwelle in ihrer Maximalhub verursachenden Stellung stehen zu lassen. Auf diese Weise könnte die zu bearbeitende Steuerwelle gegebenenfalls über ihren gesamten Umfang entsprechend bearbeitet werden. Denkbar wäre es auch, statt der Referenzgaswechselventile, die einzubauenden Gaswechselventile bei der Messung zu verwenden, um eine weitere Quelle einer Ventilhubdifferenz am fertigen Verbrennungsmotor auszuschließen, ohne den Schutzbereich des Hauptanspruchs zu verlassen.Of course, it would also be possible to perform the measurement in other positions of the reference control shaft 14, since the main differences in the valve lift due to the intermediate lever and roller cam follower occur. It is also conceivable to carry out such measurements in several positions of the reference control shaft or to measure the valve lifts during a rotation of the reference control shaft and to leave the camshaft in its maximum stroke causing position. In this way, the control shaft to be processed could possibly be processed accordingly over its entire circumference. It would also be conceivable, instead of the reference gas exchange valves, to use the gas exchange valves to be installed during the measurement in order to exclude a further source of a valve lift difference in the finished internal combustion engine without departing from the scope of the main claim.

Claims (10)

  1. Method for producing equal valve strokes in variable valve trains, wherein a control shaft (34) to be worked is placed in a grinding machine (26) and the control shaft cams (36) are ground according to stored values, characterized in that
    - intermediate levers (28) and roller cam followers (30) to be mounted are placed into a measuring device (10) in which a reference camshaft (12) and a reference control shaft (14), as well as reference slotted links (16) are arranged,
    - the resulting valve lifts are measured in the measuring device (10) for a rotation of the reference camshaft (12),
    - the gas exchange valve (18) with the smallest valve lift is determined,
    - the valve lift difference Δx between the gas exchange valve (18) with the smallest valve lift Δx and the respective valve lift of each other gas exchange valve (18) is measured,
    - using a characteristic diagram Δx/Δd, the individual valve lift differences Δx are converted into centre distance differences Δd of the control shaft (34) to be worked, the characteristic diagram allocating a valve lift difference Δx of a gas exchange valve (18) to a centre distance difference Δd of the control shaft (34,
    - the control shaft cam (36) allocated to the gas exchange valve (18) having the smallest valve lift is ground to nominal dimension, and the other control shaft cams (36) are ground to nominal dimension minus the respective centre distance difference Δd of the control shaft (34) of the respective allocated gas exchange valve (18) determined by means of the characteristic diagram.
  2. Method for producing equal valve strokes in variable valve trains of claim 1, characterized in that the respective worked control shaft (34) and the associated intermediate levers (28) and roller cam followers (30) are unambiguously associated to each other for further assembly.
  3. Method for producing equal valve strokes in variable valve trains of one of the preceding claims, characterized in that the characteristic diagram is determined by tests using reference intermediate levers and reference roller cam followers.
  4. Method for producing equal valve strokes in variable valve trains of one of the preceding claims, characterized in that the characteristic diagram is stored in a control unit (24) of the grinding machine (26).
  5. Method for producing equal valve strokes in variable valve trains of one of the preceding claims, characterized in that a CNC machine is used as the grinding machine (26).
  6. Method for producing equal valve strokes in variable valve trains of one of the preceding claims, characterized in that reference gas exchange valves (18) are arranged in the measuring device (10) for measuring purposes.
  7. Method for producing equal valve strokes in variable valve trains of one of claims 1 to 5, characterized in that valves to be assembled, which are respectively allocated to the intermediated levers (28) and the roller cam followers (30), are placed in the measuring device (10).
  8. Method for producing equal valve strokes in variable valve trains of one of the preceding claims, characterized in that the measurement is performed at a defined reference position of the reference control shaft (14).
  9. Method for producing equal valve strokes in variable valve trains of one of the preceding claims, characterized in that the reference position of the reference control shaft (14) is the position in which the same causes a minimum lift of the gas exchange valves (18).
  10. Method for producing equal valve strokes in variable valve trains of one of the preceding claims, characterized in that for matching the data measured by the measuring device (10), a plurality of measurements are made in different defined positions of the reference control shaft (14).
EP14708531.0A 2013-06-21 2014-03-05 Method for producing same valve lifts in a variable valve train Not-in-force EP3011148B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201310106515 DE102013106515B3 (en) 2013-06-21 2013-06-21 Process for the production of valve equalizers on variable valve trains
PCT/EP2014/054262 WO2014202241A1 (en) 2013-06-21 2014-03-05 Method for producing equal valve lifts on variable valvetrains

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EP3011148A1 EP3011148A1 (en) 2016-04-27
EP3011148B1 true EP3011148B1 (en) 2017-05-10

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DE (1) DE102013106515B3 (en)
WO (1) WO2014202241A1 (en)

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CN116175345B (en) * 2023-02-10 2023-11-21 扬州江峰机械制造有限公司 Valve push rod cleaning sander

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Publication number Priority date Publication date Assignee Title
GB854498A (en) * 1956-01-24 1960-11-23 Birmingham Small Arms Co Ltd Improvements in or relating to the gauging of cam profiles
DE10258277A1 (en) * 2002-12-13 2004-06-24 Mahle Ventiltrieb Gmbh Control device for gas exchange valves of an internal combustion engine
DE10304991A1 (en) * 2003-02-07 2004-08-19 Ina-Schaeffler Kg Adjusting device for effecting lifting functions of lever-type cam-driven transmission links works in a varied valve mechanism for controlling a spark-ignition internal combustion engine under load
DE10323665B4 (en) * 2003-05-14 2009-02-05 Hydraulik-Ring Gmbh Variable valve lifting device for stroke adjustment of the gas exchange valves of an internal combustion engine
DE102004053208A1 (en) * 2004-11-04 2006-07-20 Schaeffler Kg Fully variable mechanical valve gear for lift adjustment of gas exchange valves in reciprocating piston engine has cam plate fastened on adjusting shaft by at least one tension screw reaching through transverse hole in adjusting shaft
DE102010048709B4 (en) * 2010-10-19 2013-01-03 Kolbenschmidt Pierburg Innovations Gmbh Mechanically controllable valve drive and mechanically controllable valve train arrangement
DE102011003022A1 (en) * 2011-01-24 2012-07-26 Schaeffler Technologies Gmbh & Co. Kg Method for achieving uniform rate of filling of cylinders of combustion engine, involves selecting valve clearance compensation elements having equal dropping times, from amount of elements for which dropping times are measured

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WO2014202241A1 (en) 2014-12-24
DE102013106515B3 (en) 2014-12-24

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