EP1593880B1 - Control shaft of a lift-variable valve drive - Google Patents

Control shaft of a lift-variable valve drive Download PDF

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Publication number
EP1593880B1
EP1593880B1 EP20050007185 EP05007185A EP1593880B1 EP 1593880 B1 EP1593880 B1 EP 1593880B1 EP 20050007185 EP20050007185 EP 20050007185 EP 05007185 A EP05007185 A EP 05007185A EP 1593880 B1 EP1593880 B1 EP 1593880B1
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EP
European Patent Office
Prior art keywords
shaft
drive component
drive
component
shaft member
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EP20050007185
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German (de)
French (fr)
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EP1593880A1 (en
Inventor
Michael Schleusener
Torsten Eder
Gerald Gallacher
Leonhard Halmanseger
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
PSA Automobiles SA
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Bayerische Motoren Werke AG
Peugeot Citroen Automobiles SA
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Publication of EP1593880A1 publication Critical patent/EP1593880A1/en
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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

Definitions

  • the present invention relates to an adjusting shaft of a variable-stroke valve drive of an internal combustion engine according to the preamble of claim 1.
  • Known internal combustion engines usually have a throttle valve which opens a suction cross section in the intake tract of the internal combustion engine more or less wide and therefore adversely affects the flow conditions in the intake tract, since it acts as a flow resistance.
  • variable valve train Although the one from the DE 101 23 186 A1 Known variable valve train has already proven in practice, it has been found that the above-mentioned adjustment is accessible in particular in terms of their production and their structure improvements.
  • the known adjusting shaft for the variable-stroke valve drive is a forgiving component which is expensive to produce and in which a uniform material is used for the complete shaft and expensive surface and heat treatments are required.
  • the contours of the individual eccentrics must be worked out of lugs on the shaft and a required after completion of the shaft heat treatment can lead to inaccuracies in the concentricity of the shaft and deviations in the accuracy of the shaft.
  • each bearing point are located between the individual eccentrics of the shaft, where the shaft must be supported by needle bearings, these needle bearings must be bearings with split bearings, in which guided in a plastic cage needles are used, which makes it clear that it is in the needle bearings are complex to produce special components and in which it can come to shock shocks when rolling the rolling elements on the bearing shock due to the split bearing shell.
  • the present invention is an object of the invention to provide an adjustment of a variable stroke valve train of an internal combustion engine, which eliminates the disadvantages mentioned and is significantly cheaper to produce than the known forged adjustment.
  • the present invention now provides an adjusting shaft of a variable-stroke valve drive of an internal combustion engine, wherein the adjusting shaft is an elongated Has shaft body having a pivot lever operatively connected eccentric cam and a drive member for rotational drive of the adjusting shaft, being provided according to the invention that the shaft body, the eccentric cam and the drive member are made separately and the eccentric cam and the drive member to form the adjusting be arranged on the shaft body according to their respective production.
  • the shaft body is formed by an at least partially tubular piece hollow body, which compared to the known wave provides a significant cost advantage in the production of the adjustment according to the invention.
  • a solid shaft can be used in the form of, for example, a already finished in the field of bearings shaft.
  • the drive component is generally a component that converts a driven component of a drive into a rotational movement of the adjusting shaft.
  • a driven component of a drive for example, an electric motor or a hydraulic drive can be used, the output component is displaced.
  • the output member is engaged with the drive member on the shaft body and thus can rotate the adjusting shaft.
  • the drive component may be a spur gear stage of a spur gear or a worm wheel stage of a worm gear or a rack gear or a crank drive.
  • the eccentric cam and / or the drive member can be made in the form of, for example, a helical gear or worm wheel by means of a punching operation and placed after their preparation on the hollow body.
  • the adjustment shaft provided according to the invention has to its storage shaft bearing, which are formed by rolling bearings or plain bearings or two types of bearings, which are positioned by means of arranged on the body eccentric cam spacers on the shaft body can, so that this also a much cheaper positioning of the bearings on the adjusting is possible.
  • the drive component provided for the rotary drive of the known adjusting shaft is arranged for manufacturing reasons in this known adjusting largely in the axial longitudinal center and therefore leads to a problem of so-called packaging, since in this area often cylinder head bolts are provided on the engine and thus the problem of limitation the clearance of the cylinder head bolts consists.
  • the adjusting shaft according to the invention is a shaft composed of a plurality of separately produced components, it is also provided according to the invention that the drive component provided for the rotary drive of the adjusting shaft is arranged in the region of an end face of the shaft body, so that the above-described Packaging problem is solved.
  • the eccentric cam and / or the drive member can be fixed to the shaft body by means of a rotationally fixed shaft / hub connection, for which purpose knurling can be provided, for example.
  • the adjusting shaft according to the invention can be driven via the above-described drive member by means of a standing in operative connection electric motor for rotating or pivoting movement, the drive has to take place due to the respective end positions of the eccentric cam relative to the above-described transmission mechanism so that a rotation of the adjusting must be avoided beyond a predetermined rotation angle range.
  • the drive member is formed with at least one rotation angle limiting stop, so that the drive member in addition to the function of the drive of the adjusting also performs the function of limiting the rotation angle range of the adjusting.
  • the invention is also characterized by the fact that the shaft body and / or the eccentric cam and / or the drive component made of different materials, the respective requirement profiles can be made accordingly and thus is not the case that the entire shaft of one, the highest loaded component must be manufactured according to selected uniform material.
  • the adjusting shaft according to the invention shown in perspective in the drawing is an adjusting shaft provided for a four-cylinder in-line engine with two inlet valves each.
  • the adjusting shaft 1 an elongated body 2, which is formed by a simple and inexpensive to manufacture inside hollow and thus tubular piece continuous tubular body to which then after the production of the other parts of the adjusting this can be placed later ,
  • a solid shaft instead of the tube body shown, it is also possible to use a solid shaft.
  • the adjusting shaft according to the illustrated embodiment, a total of eight eccentric cams 3, which can be manufactured, for example, as inexpensive to produce stamped parts and between which are each arranged to support the adjusting needle roller bearings 4 are arranged.
  • these needle bearings can be produced in large numbers Standard bearings act, which have a one-piece bearing outer ring and therefore have no more impact, as is the case with multi-part bearing shells, which had to be used in the known one-piece adjusting shaft.
  • the adjusting shaft 1 comprises a drive member 5 which is arranged on a substantially front end portion of the adjusting shaft 1 and thus solves the above-described problem of clearance of the cylinder head bolts.
  • the drive member is a, a partial circle of about 180 ° enclosing component with an external toothing for engagement in the output screw of an electric motor not shown, with which the adjusting shaft 1 can be rotated so that the eccentric cam 3 is not shown Apply transmission mechanism so that rotation of the intake camshaft leads to opening of the intake valves of the variable displacement engine.
  • the drive member 5 has two rotation angle limiting stops 6, in which a not-shown component can intervene to limit the rotation angle.
  • the invention is characterized by the fact that the adjusting shaft according to the invention can be made substantially less expensive than the known adjusting shaft made of a one-piece forging component.
  • the components forming the individual components of the adjustment shaft according to the invention may consist of application-specific selected different materials, which can therefore be optimized for the respective component-specific load.
  • the adjusting shaft can due to the closed bearing 4 in contrast to the split bearings used in the known wave be stored precisely and also have a non-shared bearing outer ring bearing having increased load capacity. Due to the arrangement of the drive component on an end-face end region of the main body of the shaft, it is possible to avoid the problem of limiting the clearance of the cylinder head bolts of the internal combustion engine.
  • the stops necessary for limiting the rotation of the adjusting shaft can be integrated into the drive component of the adjusting shaft and the bearings provided between the eccentric cams can be precisely positioned by means of simple spacers made of, for example, plastic bushes and supported against these eccentric cams.
  • the shaft according to the invention has the advantage that it can be completely finished and pre-assembled and so can be used on the assembly line in the cylinder head of the engine, without incurring additional steps on the band.

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

Description

Die vorliegende Erfindung betrifft eine Verstellwelle eines hubvariablen Ventiltriebs einer Brennkraftmaschine nach dem Oberbegriff des Anspruches 1.The present invention relates to an adjusting shaft of a variable-stroke valve drive of an internal combustion engine according to the preamble of claim 1.

Bekannte Brennkraftmaschinen weisen üblicherweise eine Drosselklappe auf, die einen Ansaugquerschnitt im Ansaugtrakt des Verbrennungsmotors mehr oder weniger weit öffnet und daher die Strömungsverhältnisse im Ansaugtrakt negativ beeinflusst, da sie als Strömungswiderstand wirkt.Known internal combustion engines usually have a throttle valve which opens a suction cross section in the intake tract of the internal combustion engine more or less wide and therefore adversely affects the flow conditions in the intake tract, since it acts as a flow resistance.

Zur Vermeidung dieses Problems wurden daher bereits Versuche unternommen, diese Drosselklappe dadurch wegfallen zu lassen, dass die Füllung der einzelnen Zylinder der Verbrennungskraftmaschine durch eine Veränderung des Hubs der Einlassventile des Motors modifiziert wird. Zu diesem Zweck sind bereits sehr erfolgreich hubvariable Ventiltriebe zum Einsatz gekommen, die eine Laststeuerung des Motors alleine durch die veränderliche Ventilerhebung zulassen. Bei einem solchen System, welches beispielsweise anhand der DE 101 23 186 A1 , oder US-A-5 826 461 bekannt ist, wirkt ein Übertragungsmechanismus zwischen den Nocken der Nockenwelle und den Ventilen, wobei der Übertragungsmechanismus Rollenschlepphebel zur Ventilbetätigung betätigt. Mittels eines elektrischen Stellmotors wird eine Verstellwelle, die als Exzenterwelle ausgebildet ist, verstellt und die Hebelgeometrie des Übertragungsmechanismus so modifiziert, dass der Hub des Einlassventils vom Nullhub bis zum Vollhub verändert werden kann.To avoid this problem, attempts have therefore already been made to eliminate this throttle valve by modifying the filling of the individual cylinders of the internal combustion engine by changing the lift of the intake valves of the engine. For this purpose, highly variable stroke valve trains have already been used, which allow load control of the engine solely by the variable valve lift. In such a system, for example, based on the DE 101 23 186 A1 , or US-A-5,826,461 is known, acts a transmission mechanism between the cam of the camshaft and the valves, wherein the transmission mechanism operates roller cam followers for valve actuation. By means of an electric servomotor, an adjusting shaft, which is designed as an eccentric shaft, adjusted and the lever geometry of the transmission mechanism modified so that the lift of the intake valve can be changed from the zero stroke to the full stroke.

Obwohl sich der aus der DE 101 23 186 A1 bekannte hubveränderliche Ventiltrieb in der Praxis bereits bestens bewährt hat, hat es sich gezeigt, dass die vorstehend genannte Verstellwelle Verbesserungen insbesondere hinsichtlich ihrer Herstellung und ihres Aufbaus zugänglich ist.Although the one from the DE 101 23 186 A1 Known variable valve train has already proven in practice, it has been found that the above-mentioned adjustment is accessible in particular in terms of their production and their structure improvements.

So handelt es sich bei der bekannten Verstellwelle für den hubvariablen Ventiltrieb um ein aufwendig herzustellendes Schmiedebauteil, bei dem ein einheitlicher Werkstoff für die komplette Welle zum Einsatz kommt und aufwendige Oberflächen- und Wärmebehandlungen erforderlich sind. Auch müssen die Konturen der einzelnen Exzenter aus Ansätzen an der Welle herausgearbeitet werden und eine nach Fertigstellung der Welle erforderliche Wärmebehandlung kann zu Ungenauigkeiten hinsichtlich des Rundlaufs der Welle und zu Abweichungen hinsichtlich der Formgenauigkeit der Welle führen.Thus, the known adjusting shaft for the variable-stroke valve drive is a forgiving component which is expensive to produce and in which a uniform material is used for the complete shaft and expensive surface and heat treatments are required. Also, the contours of the individual eccentrics must be worked out of lugs on the shaft and a required after completion of the shaft heat treatment can lead to inaccuracies in the concentricity of the shaft and deviations in the accuracy of the shaft.

Da sich zwischen den einzelnen Exzentern der Welle jeweils Lagerstellen befinden, an denen die Welle mittels Nadellagern gelagert werden muss, muss es sich bei diesen Nadellagern um Lager mit geteilten Lagerschalen handeln, in die in einem Kunststoffkäfig geführte Nadeln eingesetzt werden, was deutlich macht, dass es sich bei den Nadellagern um aufwendig herzustellende Sonderbauteile handelt und bei denen es aufgrund der geteilten Lagerschale zu Stoßbelastungen beim Abwälzen der Wälzkörper am Lagerstoß kommen kann.Since each bearing points are located between the individual eccentrics of the shaft, where the shaft must be supported by needle bearings, these needle bearings must be bearings with split bearings, in which guided in a plastic cage needles are used, which makes it clear that it is in the needle bearings are complex to produce special components and in which it can come to shock shocks when rolling the rolling elements on the bearing shock due to the split bearing shell.

Ausgehend hiervon liegt der vorliegenden Erfindung nunmehr die Aufgabe zugrunde, eine Verstellwelle eines hubvariablen Ventiltriebs einer Brennkraftmaschine zu schaffen, die die genannten Nachteile beseitigt und deutlich kostengünstiger herzustellen ist als die bekannte geschmiedete Verstellwelle.Proceeding from this, the present invention is an object of the invention to provide an adjustment of a variable stroke valve train of an internal combustion engine, which eliminates the disadvantages mentioned and is significantly cheaper to produce than the known forged adjustment.

Die zur Lösung dieser Aufgabe geschaffene Erfindung weist die im Anspruch 1 angegebenen Merkmale auf. Vorteilhafte Ausgestaltungen hiervon sind in den weiteren Ansprüchen beschrieben.The created to solve this problem invention has the features specified in claim 1. Advantageous embodiments thereof are described in the further claims.

Die vorliegende Erfindung schafft nun eine Verstellwelle eines hubvariablen Ventiltriebs einer Brennkraftmaschine, wobei die Verstellwelle einen langgestreckten Wellenkörper besitzt, der mit einem Schwenkhebel in Wirkverbindung stehende Exzenternocken und ein Antriebsbauteil zum Drehantrieb der Verstellwelle besitzt, wobei nach der Erfindung vorgesehen ist, dass der Wellenkörper, die Exzenternocken und das Antriebsbauteil getrennt voneinander gefertigt werden und die Exzenternocken sowie das Antriebsbauteil zur Bildung der Verstellwelle am Wellenkörper nach ihrer jeweiligen Fertigung angeordnet werden.The present invention now provides an adjusting shaft of a variable-stroke valve drive of an internal combustion engine, wherein the adjusting shaft is an elongated Has shaft body having a pivot lever operatively connected eccentric cam and a drive member for rotational drive of the adjusting shaft, being provided according to the invention that the shaft body, the eccentric cam and the drive member are made separately and the eccentric cam and the drive member to form the adjusting be arranged on the shaft body according to their respective production.

Im Gegensatz zu der bekannten einteilig ausgebildeten Verstellwelle ist es nach der Erfindung vorgesehen, dass der Wellenkörper von einem zumindest abschnittsweise rohrstückförmigen hohlen Grundkörper gebildet ist, was verglichen mit der bekannten Welle einen deutlichen Kostenvorteil bei der Herstellung der erfindungsgemäßen Verstellwelle erbringt. Statt des genannten Rohrkörpers kann aber nach der Erfindung auch eine Vollwelle zum Einsatz kommen in der Form beispielsweise einer auch schon im Bereich der Lagerstellen fertig bearbeiteten Welle.In contrast to the known one-piece adjusting shaft, it is provided according to the invention that the shaft body is formed by an at least partially tubular piece hollow body, which compared to the known wave provides a significant cost advantage in the production of the adjustment according to the invention. Instead of said tubular body but according to the invention, a solid shaft can be used in the form of, for example, a already finished in the field of bearings shaft.

Bei dem Antriebsbauteil handelt es sich ganz allgemein um ein eine Verlagerung eines Abtriebsbauteils eines Antriebs in eine Drehbewegung der Verstellwelle umsetzendes Bauteil. Als Antrieb kann beispielsweise ein Elektromotor oder ein hydraulischer Antrieb zum Einsatz kommen, dessen Abtriebsbauteil verlagert wird. Das Abtriebsbauteil steht mit dem Antriebsbauteil auf dem Wellenkörper in Eingriff und kann somit die Verstellwelle verdrehen. So kann es sich bei dem Antriebsbauteil beispielsweise um eine Stirnradstufe eines Stirnradgetriebes oder eine Schneckenradstufe eines Schneckenradgetriebes oder einen Zahnstangentrieb oder einen Kurbeltrieb handeln.The drive component is generally a component that converts a driven component of a drive into a rotational movement of the adjusting shaft. As drive, for example, an electric motor or a hydraulic drive can be used, the output component is displaced. The output member is engaged with the drive member on the shaft body and thus can rotate the adjusting shaft. For example, the drive component may be a spur gear stage of a spur gear or a worm wheel stage of a worm gear or a rack gear or a crank drive.

Darüber hinaus können die Exzenternocken und/oder das Antriebsbauteil in der Form beispielsweise eines Schraubrads oder Schneckenrads mittels eines Stanzvorgangs gefertigt werden und nach ihrer Herstellung auf den hohlen Grundkörper aufgesetzt werden. Die nach der Erfindung vorgesehene Verstellwelle weist zu ihrer Lagerung Wellenlager auf, die von Wälzlagern oder Gleitlagern oder beiden Lagerarten gebildet sind, die mittels sich an auf dem Grundkörper angeordneten Exzenternocken abstützenden Distanzhaltern am Wellenkörper positioniert werden können, so dass auch hierdurch eine deutlich kostengünstigere Positionierung der Lager an der Verstellwelle möglich ist. Statt der Abstützung der Distanzhalter an Exzenternocken ist es auch möglich, die Distanzhalter kraftschlüssig, beispielsweise in der Form einer Presspassung am Wellenkörper anzubringen.In addition, the eccentric cam and / or the drive member can be made in the form of, for example, a helical gear or worm wheel by means of a punching operation and placed after their preparation on the hollow body. The adjustment shaft provided according to the invention has to its storage shaft bearing, which are formed by rolling bearings or plain bearings or two types of bearings, which are positioned by means of arranged on the body eccentric cam spacers on the shaft body can, so that this also a much cheaper positioning of the bearings on the adjusting is possible. Instead of supporting the spacers on eccentric cams, it is also possible to frictionally attach the spacers, for example in the form of a press fit on the shaft body.

Das zum Drehantrieb der bekannten Verstellwelle vorgesehene Antriebsbauteil ist aus fertigungstechnischen Gründen bei dieser bekannten Verstellwelle weitgehend im Bereich der axialen Längsmitte angeordnet und führt daher zu einem Problem des sogenannten Packaging, da in diesem Bereich oftmals Zylinderkopfschrauben an dem Verbrennungsmotor vorgesehen sind und somit das Problem einer Einschränkung des Freigangs der Zylinderkopfschrauben besteht.The drive component provided for the rotary drive of the known adjusting shaft is arranged for manufacturing reasons in this known adjusting largely in the axial longitudinal center and therefore leads to a problem of so-called packaging, since in this area often cylinder head bolts are provided on the engine and thus the problem of limitation the clearance of the cylinder head bolts consists.

Da es sich bei der erfindungsgemäßen Verstellwelle um eine aus mehreren getrennt voneinander hergestellten Bestandteilen zusammengesetzten Welle handelt, ist es nach der Erfindung auch vorgesehen, dass das zum Drehantrieb der Verstellwelle vorgesehene Antriebsbauteil im Bereich eines stirnseitigen Endes des Wellenkörpers angeordnet ist, so dass das vorstehend beschriebene Packaging-Problem gelöst ist.Since the adjusting shaft according to the invention is a shaft composed of a plurality of separately produced components, it is also provided according to the invention that the drive component provided for the rotary drive of the adjusting shaft is arranged in the region of an end face of the shaft body, so that the above-described Packaging problem is solved.

Nach einer Weiterbildung der Erfindung können die Exzenternocken und/oder das Antriebsbauteil am Wellenkörper mittels einer drehfesten Wellen/Nabenverbindung festgelegt werden, wobei zu diesem Zweck beispielsweise eine Rändelung vorgesehen sein kann.According to a development of the invention, the eccentric cam and / or the drive member can be fixed to the shaft body by means of a rotationally fixed shaft / hub connection, for which purpose knurling can be provided, for example.

Die erfindungsgemäße Verstellwelle kann über das vorstehend bereits beschriebene Antriebsbauteil mittels eines damit in Wirkverbindung stehenden Elektromotors zur Dreh- bzw. Verschwenkbewegung angetrieben werden, wobei der Antrieb aufgrund der jeweiligen Endlagen der Exzenternocken relativ zum vorstehend geschilderten Übertragungsmechanismus so zu erfolgen hat, dass ein Verdrehen der Verstellwelle über einen vorbestimmten Drehwinkelbereich hinaus vermieden werden muss. Zu diesem Zweck ist es nach der Erfindung vorgesehen, dass das Antriebsbauteil mit mindestens einem Drehwinkelbegrenzungsanschlag ausgebildet ist, so dass das Antriebsbauteil neben der Funktion des Antriebs der Verstellwelle auch die Funktion der Begrenzung des Drehwinkelbereichs der Verstellwelle ausführt.The adjusting shaft according to the invention can be driven via the above-described drive member by means of a standing in operative connection electric motor for rotating or pivoting movement, the drive has to take place due to the respective end positions of the eccentric cam relative to the above-described transmission mechanism so that a rotation of the adjusting must be avoided beyond a predetermined rotation angle range. For this purpose, it is provided according to the invention that the drive member is formed with at least one rotation angle limiting stop, so that the drive member in addition to the function of the drive of the adjusting also performs the function of limiting the rotation angle range of the adjusting.

Schließlich zeichnet sich die Erfindung auch noch dadurch aus, dass der Wellenkörper und/oder die Exzenternocken und/oder das Antriebsbauteil aus unterschiedlichen Werkstoffen, den jeweiligen Anforderungsprofilen entsprechend, gefertigt werden können und somit nicht der Fall vorliegt, dass die gesamte Welle aus einem, dem am höchsten belasteten Bauteil entsprechend ausgewählten einheitlichen Werkstoff gefertigt werden muss.Finally, the invention is also characterized by the fact that the shaft body and / or the eccentric cam and / or the drive component made of different materials, the respective requirement profiles can be made accordingly and thus is not the case that the entire shaft of one, the highest loaded component must be manufactured according to selected uniform material.

Die Erfindung wird im folgenden anhand der Zeichnung näher erläutert. Diese zeigt in der einzigen Figur die perspektivische Darstellung der erfindungsgemäßen Verstellwelle.The invention will be explained in more detail below with reference to the drawing. This shows in the single figure, the perspective view of the adjusting shaft according to the invention.

Bei der in der Zeichnung perspektivisch dargestellten erfindungsgemäßen Verstellwelle handelt es sich um eine für einen Vierzylinder-Reihenmotor mit jeweils zwei Einlassventilen vorgesehenen Verstellwelle.The adjusting shaft according to the invention shown in perspective in the drawing is an adjusting shaft provided for a four-cylinder in-line engine with two inlet valves each.

Wie es ohne weiteres ersichtlich ist, weist die Verstellwelle 1 einen langgestreckten Grundkörper 2 auf, der von einem einfach und kostengünstig herzustellenden innen hohlen und damit rohrstückförmigen durchgehenden Rohrkörper gebildet ist, an dem dann nach der Herstellung der weiteren Teile der Verstellwelle diese nachträglich aufgesetzt werden können. Statt des gezeigten Rohrkörpers ist es auch möglich, eine Vollwelle einzusetzen.As can be readily seen, the adjusting shaft 1 an elongated body 2, which is formed by a simple and inexpensive to manufacture inside hollow and thus tubular piece continuous tubular body to which then after the production of the other parts of the adjusting this can be placed later , Instead of the tube body shown, it is also possible to use a solid shaft.

Wie es ohne weiteres anhand der Zeichnung ersichtlich ist, weist die Verstellwelle nach der dargestellten Ausführungsform insgesamt acht Exzenternocken 3 auf, die beispielsweise als kostengünstig herzustellende Stanzteile gefertigt werden können und zwischen denen sich jeweils zur Lagerung der Verstellwelle vorgesehene Nadellager 4 angeordnet befinden.As is readily apparent from the drawing, the adjusting shaft according to the illustrated embodiment, a total of eight eccentric cams 3, which can be manufactured, for example, as inexpensive to produce stamped parts and between which are each arranged to support the adjusting needle roller bearings 4 are arranged.

Aufgrund der ganz besonderen erfindungsgemäßen Ausgestaltung der Verstellwelle kann es sich bei diesen Nadellagern um in großen Stückzahlen hergestellte Standardlager handeln, die einen einteiligen Lageraußenring besitzen und daher keinen Stoß mehr aufweisen, wie dies bei mehrteiligen Lagerschalen der Fall ist, die bei der bekannten einteilig ausgebildeten Verstellwelle zum Einsatz kommen mussten.Due to the very special embodiment of the adjusting shaft according to the invention, these needle bearings can be produced in large numbers Standard bearings act, which have a one-piece bearing outer ring and therefore have no more impact, as is the case with multi-part bearing shells, which had to be used in the known one-piece adjusting shaft.

Auch weist die erfindungsgemäße Verstellwelle 1 ein Antriebsbauteil 5 auf, das an einem im wesentlichen stirnseitigen Endbereich der Verstellwelle 1 angeordnet ist und somit das vorstehend geschilderte Problem des Freigangs der Zylinderkopfschrauben löst. Bei dem Antriebsbauteil handelt es sich um ein, einen Teilkreis von etwa 180° einschließendes Bauteil mit einer Außenverzahnung zum Eingriff in die Abtriebsschnecke eines nicht näher dargestellten Elektromotors, mit dem die Verstellwelle 1 so in Drehung versetzt werden kann, dass die Exzenternocken 3 den nicht dargestellten Übertragungsmechanismus so beaufschlagen, dass eine Drehung der Einlassnockenwelle zu einem Öffnen der Einlassventile des Verbrennungsmotors mit veränderbarem Hub führt. Um ein Verdrehen der Verstellwelle 1 über den konstruktiv vorgesehenen Drehwinkelbereich hinaus zu vermeiden, besitzt das Antriebsbauteil 5 zwei Drehwinkelbegrenzungsanschläge 6, in die ein nicht näher dargestelltes Bauteil zur Drehwinkelbegrenzung eingreifen kann.Also, the adjusting shaft 1 according to the invention comprises a drive member 5 which is arranged on a substantially front end portion of the adjusting shaft 1 and thus solves the above-described problem of clearance of the cylinder head bolts. In the drive member is a, a partial circle of about 180 ° enclosing component with an external toothing for engagement in the output screw of an electric motor not shown, with which the adjusting shaft 1 can be rotated so that the eccentric cam 3 is not shown Apply transmission mechanism so that rotation of the intake camshaft leads to opening of the intake valves of the variable displacement engine. In order to prevent rotation of the adjusting shaft 1 on the constructionally provided rotation angle range addition, the drive member 5 has two rotation angle limiting stops 6, in which a not-shown component can intervene to limit the rotation angle.

Die Erfindung zeichnet sich nun dadurch aus, dass die erfindungsgemäße Verstellwelle wesentlich kostengünstiger hergestellt werden kann als die aus einem einteiligen Schmiedebauteil gefertigte bekannte Verstellwelle. Darüber hinaus können die die einzelnen Bestandteile der erfindungsgemäßen Verstellwelle bildenden Bauteile aus anwendungsspezifisch ausgewählten unterschiedlichen Werkstoffen bestehen, die daher für die jeweilige bauteilspezifische Belastung optimiert werden können. Es ist insbesondere möglich, den rohrstückförmigen Wellengrundkörper 2 aus einem einfachen Werkstoff zu bilden, während die mechanisch höher belasteten Exzenternocken 3 aus einem entsprechend.höherwertigen Werkstoff gefertigt werden. Bei der erfindungsgemäßen Verstellwelle ist es nicht mehr erforderlich, diese einer Wärmebehandlung nach ihrer Fertigung zu unterziehen, so dass das Problem eines etwaigen thermischen Verzugs der langgestreckten Welle vermieden wird. Die Verstellwelle kann aufgrund der geschlossenen Lager 4 im Gegensatz zu den bei der bekannten Welle verwendeten geteilten Lagerschalen präzise gelagert werden und darüber hinaus besitzen die einen nicht geteilten Lageraußenring aufweisenden Lager eine erhöhte Tragfähigkeit. Durch die Anordnung des Antriebsbauteils an einem stirnseitigen Endbereich des Grundkörpers der Welle ist es möglich, das Problem der Einschränkung des Freigangs der Zylinderkopfschrauben des Verbrennungsmotors zu vermeiden. Die zur Drehwinkelbegrenzung der Verstellwelle notwendigen Anschläge können in das Antriebsbauteil der Verstellwelle integriert werden und die zwischen den Exzenternocken vorgesehenen Lager können mittels einfachen sich gegen diese Exzenternocken abstützenden Distanzhaltern aus beispielsweise Kunststoffbuchsen präzise positioniert werden.The invention is characterized by the fact that the adjusting shaft according to the invention can be made substantially less expensive than the known adjusting shaft made of a one-piece forging component. In addition, the components forming the individual components of the adjustment shaft according to the invention may consist of application-specific selected different materials, which can therefore be optimized for the respective component-specific load. In particular, it is possible to form the tubular body 2 from a simple material, while the eccentric cams 3 which are subjected to higher mechanical loads are manufactured from a correspondingly higher material. In the adjusting shaft according to the invention, it is no longer necessary to subject them to a heat treatment after their production, so that the problem of a possible thermal distortion of the elongated shaft is avoided. The adjusting shaft can due to the closed bearing 4 in contrast to the split bearings used in the known wave be stored precisely and also have a non-shared bearing outer ring bearing having increased load capacity. Due to the arrangement of the drive component on an end-face end region of the main body of the shaft, it is possible to avoid the problem of limiting the clearance of the cylinder head bolts of the internal combustion engine. The stops necessary for limiting the rotation of the adjusting shaft can be integrated into the drive component of the adjusting shaft and the bearings provided between the eccentric cams can be precisely positioned by means of simple spacers made of, for example, plastic bushes and supported against these eccentric cams.

Darüber hinaus weist die erfindungsgemäße Welle den Vorteil auf, dass sie vollständig fertig bearbeitet und vormontiert werden kann und so am Montageband in den Zylinderkopf des Verbrennungsmotors eingesetzt werden kann, ohne dass am Band weitere Arbeitsschritte anfallen.In addition, the shaft according to the invention has the advantage that it can be completely finished and pre-assembled and so can be used on the assembly line in the cylinder head of the engine, without incurring additional steps on the band.

Hinsichtlich vorstehend im einzelnen nicht näher erläuterter Merkmale der Erfindung wird im übrigen ausdrücklich auf die Ansprüche und die Zeichnung verwiesen.With regard to the above in detail not explained in detail features of the invention, reference is expressly made to the claims and the drawings.

Claims (8)

  1. A shaft for adjusting a variable-stroke valve drive of an internal combustion engine, comprising an elongate shaft member (2) comprising cams (3) operatively connected to a rocking lever and a drive component (5) for rotating the shaft (1), wherein
    the shaft member (2), the cam (3) and the drive component (5) are separately produced and the cam (3) and drive component (5) for forming the shaft (1) are disposed on the shaft member (2),
    characterised in that the drive component (5) is equipped with at least one angle of rotation-limiting stop (6).
  2. A shaft according to claim 1, characterised in that the shaft member (2) is in the form of a hollow base member (2) which is tubular at least in parts.
  3. A shaft according to claim 1 or claim 2, characterised in that the cam (3) and/or the drive component (5) are made by punching.
  4. A shaft according to any of the preceding claims, characterised by bearings (4) in the form especially of rolling bearings and/or friction bearings positioned on the shaft number (2) by spacers abutting one another on the shaft member (2).
  5. A shaft according to any of the preceding claims, characterised in that the drive component (5) is disposed at an end face of the shaft member (2).
  6. A shaft according to any of the preceding claims, characterised in that the cams (3) and/or the drive component (5) are fastened to the shaft member (2) by a co-rotating shaft/hub connection.
  7. A shaft according to any of the preceding claims, characterised in that the shaft member (2) and/or the cams (3) and/or the drive component (5) are made of different materials.
  8. A shaft according to any of the preceding claims, characterised in that the drive component (5) converts a displacement of an output component of a drive into rotation of the adjustment shaft.
EP20050007185 2004-05-03 2005-04-01 Control shaft of a lift-variable valve drive Active EP1593880B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004021646 2004-05-03
DE200410021646 DE102004021646A1 (en) 2004-05-03 2004-05-03 Adjusting shaft of a variable-stroke valve drive

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EP1593880A1 EP1593880A1 (en) 2005-11-09
EP1593880B1 true EP1593880B1 (en) 2008-05-07

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DE102004021646A1 (en) 2005-12-01
DE502005003945D1 (en) 2008-06-19
EP1593880A1 (en) 2005-11-09

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