EP1803904B1 - Camshaft - Google Patents

Camshaft Download PDF

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Publication number
EP1803904B1
EP1803904B1 EP06125818A EP06125818A EP1803904B1 EP 1803904 B1 EP1803904 B1 EP 1803904B1 EP 06125818 A EP06125818 A EP 06125818A EP 06125818 A EP06125818 A EP 06125818A EP 1803904 B1 EP1803904 B1 EP 1803904B1
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EP
European Patent Office
Prior art keywords
shafts
camshaft
drive
swash
shaft
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
EP06125818A
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German (de)
French (fr)
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EP1803904A3 (en
EP1803904A2 (en
Inventor
Martin Lechner
Oliver Fritz
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Mahle International GmbH
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Mahle International GmbH
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Publication date
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Publication of EP1803904A2 publication Critical patent/EP1803904A2/en
Publication of EP1803904A3 publication Critical patent/EP1803904A3/en
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Publication of EP1803904B1 publication Critical patent/EP1803904B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
    • 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
    • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
    • F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
    • F01L1/34413—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using composite camshafts, e.g. with cams being able to move relative to the camshaft
    • 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
    • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
    • F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
    • F01L1/352—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using bevel or epicyclic gear
    • 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
    • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
    • F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
    • F01L1/356—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear making the angular relationship oscillate, e.g. non-homokinetic drive
    • 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
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • F01L2001/0471—Assembled camshafts
    • F01L2001/0473—Composite camshafts, e.g. with cams or cam sleeve being able to move relative to the inner camshaft or a cam adjusting rod
    • 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
    • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
    • F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
    • F01L2001/34486—Location and number of the means for changing the angular relationship
    • F01L2001/34493—Dual independent phasing system [DIPS]

Definitions

  • the invention relates to a camshaft for in particular an actuation of the gas exchange valves of an internal combustion engine according to the preamble of patent claim 1.
  • Such a camshaft is known, for example EP 0 582 846 B1 and US 6,725,817 , In these camshafts, the two actuators are hydraulically actuated.
  • Such hydraulic drives operate on the one hand relatively inertially and, on the other hand, are temperature-dependent with respect to their control values. In addition, larger adjustment angles are difficult and not achievable with the aforementioned special drive designs.
  • the invention is concerned with the problem of providing a speedy, with respect to their positioning accuracy independent actuators in a generic camshaft with which in particular practically arbitrarily large adjustment angle are easily possible.
  • This problem is solved by the application of a for adjusting the camshaft itself already DE 102 22 475 A1 known swash plate drive in a special embodiment according to the characterizing features of patent claim 1.
  • the invention is based on the general idea to convert a known in itself for the rotational angle adjustment of a one-piece camshaft swashplate actuator in a simple manner in a double actuator, with the constructively simple and safe way arbitrary rotational angle adjustments of two coaxial nested waves can be achieved, the form a common camshaft, in each case connected to the one and the other of the two shafts cam on the one hand against each other navwinkelver Issue, further on the other hand at the same time also a common rotational angle adjustment of both shafts is possible.
  • the drivers of both swashplates engage in a common ring formed on one of the two shaft ends.
  • the drivers are displaceable in the direction of the common axis of the two shafts within the ring.
  • both swash plate bearings rotate about a common axis of both shafts.
  • both actuators comprise coaxial with one another, acting on the swash plate bearing drive shafts.
  • the inventive device with two swashplates comprehensive actuators allows any appropriate adjustments of the two shafts against each other and / or together with respect to the main drive with a corresponding electronic control device.
  • a particular advantage of an actuator with a swash plate is to be able to achieve very high gear ratios in a simple manner.
  • the basic principle of a swash plate drive in the form of a gear transmission is that the 2ähneterrorism between the sprocket of the swash plate and the sprocket in which the swash plate meshes, only by a small number of teeth, which may be one in the extreme case, different.
  • Such swash plate gears are known per se in the prior art, which is why their operating principle and structural design need not be explained in detail here. Further information regarding a camshaft swash plate adjustment drive may, for example, already mentioned above DE 102 22 475 A1 be removed.
  • a camshaft consists of coaxially superimposed shafts, namely a first shaft 1 as an inner shaft and a second shaft 2 as an outer shaft. Of these two shafts 1, 2, only the sections are shown at one end.
  • the consisting of the two shafts 1 and 2 camshaft has first cam, which are fixedly connected to the first shaft and second cam which are connected to the second shaft, so that these cams can be rotated by a rotation angle adjustment of the two shafts 1, 2 against each other.
  • the cams and their attachment to the two shafts 1, 2 are not shown in the drawing.
  • the two shafts 1, 2 are each connected to a separately operable actuator namely the first shaft 1 with a first actuator 3 and the second shaft 2 with a second actuator 4. Both actuators 3, 4 are designed as swash plate drives.
  • a diameter-moderately stepped ring 5 is fixedly connected, while the fixed connection is made in the small-diameter ring section, while the larger-diameter section encloses the two actuators 3, 4, of which this section is one below is more detailed component.
  • Each of the two actuators 3, 4 consists of the following components.
  • a swash plate 3 ', 4' rotatably supports on a swash plate bearing 3 ''; 4 ''.
  • the swash plate bearings 3 ''; 4 are each driven via an actuating drive shaft, namely a first and second actuating drive shaft 3 '' '; 4' ''.
  • the first drive shaft 3 '' ' coaxially supports within the second drive shaft 4' '' designed as a hollow shaft.
  • the first swash plate bearing 3 "rotatably supports on a fixedly connected to the first shaft 1 first axis 6. Fixedly connected to the first shaft 1 is an annular disc. 7
  • drivers 3 IV ; 4 IV provided, which protrude radially outward.
  • These drivers 3 IV ; 4 IV engage in a longitudinal groove 8 in the inner periphery of the ring 5 in its large diameter portion, said longitudinal groove parallel to the common axis of the first and second shaft 1, 2 extends.
  • a corresponding number of longitudinal grooves 8 is provided in your radially outer side region.
  • the two swash plates 3 ', 4' each with a ring gear namely a first and second ring gear 3 V ; 4 V provided.
  • These sprockets 3 V ; 4 V engage in each assigned sprockets.
  • In the first actuator 3, such an associated sprocket 7 ' is located on the annular disk 7.
  • the second ring gear 4 V of the second swash plate 4 ' meshes in a ring gear 9' of an annular sleeve 9.
  • the annular sleeve 9 is fixedly connected to a gear 10 of a camshaft main drive.
  • This main drive has as a drive source, a crankshaft of an internal combustion engine, of which the gear 10 is driven by a drive chain, not shown.
  • the second swash plate bearing 4 '' is rotatably mounted.
  • the two adjusting drive shafts 3 '' 'and 4' '' are part of two electric servomotors, which are not shown in the drawing.
  • the adjustable camshaft drive works as follows.
  • both shafts 1, 2 are adjusted in angle of rotation with an identical angle of rotation with respect to the gear 10.
  • the first actuator 3 For a mutual adjustment of the shafts 1, 2, the first actuator 3 provides.
  • the shafts 1 and 2 can be rotational angle adjusted in a simple manner by a corresponding control of the actuators 3, 4 against each other and together with respect to the engaging via the gear 10 main drive.

Description

Die Erfindung betrifft eine Nockenwelle für insbesondere eine Betätigung der Gaswechselventile eines Verbrennungsmotors nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a camshaft for in particular an actuation of the gas exchange valves of an internal combustion engine according to the preamble of patent claim 1.

Eine solche Nockenwelle ist bekannt aus beispielsweise EP 0 582 846 B1 und US 6,725,817 . Bei diesen Nockenwellen sind die beiden Stellantriebe hydraulisch betätigt. Derartige Hydraulikantriebe arbeiten zum einen relativ reaktionsträge und sind zum anderen bezüglich ihrer Stellwerte temperaturabhängig. Darüber hinaus sind größere Verstellwinkel schwierig und bei den vorstehenden genannten speziellen Antriebsausführungen gar nicht erreichbar.Such a camshaft is known, for example EP 0 582 846 B1 and US 6,725,817 , In these camshafts, the two actuators are hydraulically actuated. Such hydraulic drives operate on the one hand relatively inertially and, on the other hand, are temperature-dependent with respect to their control values. In addition, larger adjustment angles are difficult and not achievable with the aforementioned special drive designs.

Die Erfindung beschäftigt sich mit dem Problem, bei einer gattungsgemäßen Nockenwelle reaktionsschnelle, bezüglich ihrer Stellgenauigkeit temperaturunabhängige Stellantriebe zu schaffen, mit denen insbesondere praktisch beliebig große Stellwinkel einfach möglich sind. Gelöst wird dieses Problem durch die Anwendung eines zur Verstellung von Nockenwellen an sich bereits aus DE 102 22 475 A1 bekannten Taumelscheibenantriebes in einer speziellen Ausführung nach den kennzeichnenden Merkmalen des Patentanspruchs 1.The invention is concerned with the problem of providing a speedy, with respect to their positioning accuracy independent actuators in a generic camshaft with which in particular practically arbitrarily large adjustment angle are easily possible. This problem is solved by the application of a for adjusting the camshaft itself already DE 102 22 475 A1 known swash plate drive in a special embodiment according to the characterizing features of patent claim 1.

Vorteilhafte und zweckmäßige Ausgestaltungen sind Gegenstand der Unteransprüche.Advantageous and expedient refinements are the subject of the dependent claims.

Die Erfindung beruht auf dem allgemeinen Gedanken, einen an sich zur Drehwinkelverstellung einer einteiligen Nockenwelle bekannten Taumelscheiben-Stellantrieb in konstruktiv einfachen Weise in einen Zweifach-Stellantrieb umzuwandeln, mit dem auf konstruktiv einfache und sichere Weise beliebige Drehwinkelverstellungen zweier koaxial ineinander gelagerter Wellen erreichbar sind, die gemeinsamen eine Nockenwelle bilden, bei der jeweils mit der einen und der anderen der beiden Wellen verbundene Nocken einerseits gegeneinander drehwinkelverstellt werden können, wobei ferner andererseits gleichzeitig auch noch eine gemeinsame Drehwinkelverstellung beider Wellen möglich ist.The invention is based on the general idea to convert a known in itself for the rotational angle adjustment of a one-piece camshaft swashplate actuator in a simple manner in a double actuator, with the constructively simple and safe way arbitrary rotational angle adjustments of two coaxial nested waves can be achieved, the form a common camshaft, in each case connected to the one and the other of the two shafts cam on the one hand against each other drehwinkelverstellt, further on the other hand at the same time also a common rotational angle adjustment of both shafts is possible.

Bei einer vorteilhaften Ausbildung der Erfindung greifen die Mitnehmer beider Taumelscheiben in einen gemeinsamen, an einem der beiden Wellenenden ausgebildeten Ring ein. Die Mitnehmer sind in Richtung der gemeinsamen Achse der beiden Wellen innerhalb des Ringes verlagerbar.In an advantageous embodiment of the invention, the drivers of both swashplates engage in a common ring formed on one of the two shaft ends. The drivers are displaceable in the direction of the common axis of the two shafts within the ring.

Zweckmäßigerweise rotieren beide Taumelscheiben-Lager um eine gemeinsame Achse beider Wellen.Conveniently, both swash plate bearings rotate about a common axis of both shafts.

Für eine kompakte Bauweise der Stellantriebe in einer gemeinsamen Stelleinrichtung umfassen beide Stellantriebe koaxial zueinander ausgebildete, auf die Taumelscheiben-Lager einwirkende Antriebswellen.For a compact construction of the actuators in a common actuating device, both actuators comprise coaxial with one another, acting on the swash plate bearing drive shafts.

Die erfindungsgemäße Einrichtung mit zwei Taumelscheiben umfassenden Stellantrieben ermöglicht mit einer entsprechenden elektronischen Steuereinrichtung beliebige Verstellungen der beiden Wellen gegeneinander und/oder gemeinsam gegenüber dem Hauptantrieb.The inventive device with two swashplates comprehensive actuators allows any appropriate adjustments of the two shafts against each other and / or together with respect to the main drive with a corresponding electronic control device.

Ein besonderer Vorteil eines Stellantriebes mit einer Taumelscheibe besteht darin, auf einfache Weise sehr hohe Übersetzungsverhältnisse erreichen zu können. Das Grundprinzip eines Taumelscheiben-Antriebes in der Form eines Zahnradgetriebes besteht darin, dass sich die 2ähnezahlen zwischen dem Zahnkranz der Taumelscheibe und dem Zahnkranz, in dem die Taumelscheibe kämmt, lediglich durch lediglich eine geringe Zähnezahl, die im Extremfall eins sein kann, unterscheiden. Solche Taumelscheiben-Getriebe sind im Stand der Technik an sich bekannt, weshalb deren Wirkprinzip und konstruktiver Aufbau hier nicht näher erläutert werden muss. Nähere Informationen bezüglich eines Nockenwellen-Taumelscheibenverstellantriebes können beispielsweise der bereits eingangs erwähnten DE 102 22 475 A1 entnommen werden.A particular advantage of an actuator with a swash plate is to be able to achieve very high gear ratios in a simple manner. The basic principle of a swash plate drive in the form of a gear transmission is that the 2ähnezahlen between the sprocket of the swash plate and the sprocket in which the swash plate meshes, only by a small number of teeth, which may be one in the extreme case, different. Such swash plate gears are known per se in the prior art, which is why their operating principle and structural design need not be explained in detail here. Further information regarding a camshaft swash plate adjustment drive may, for example, already mentioned above DE 102 22 475 A1 be removed.

Ein vorteilhaftes, nachstehend näher beschriebenes Ausführungsbeispiel ist in der Zeichnung dargestellt.An advantageous, described in more detail below embodiment is shown in the drawing.

In dieser zeigen

Fig. 1
eine Taumelscheiben-Stelleinrichtung einer Nockenwelle in einem Längsschnitt,
Fig. 2
die gleiche Verstelleinrichtung in einer perspektivischen Darstellung bei einem dem Längsschnitt nach Fig. 1 aufgebrochen dargestellten Gehäuse der Stelleinrichtung.
In this show
Fig. 1
a swash plate adjusting device of a camshaft in a longitudinal section,
Fig. 2
the same adjusting device in a perspective view in a longitudinal section to Fig. 1 broken housing shown the adjusting device.

Eine Nockenwelle besteht aus koaxial ineinander gelagerten Wellen, nämlich einer ersten Welle 1 als Innenwelle und einer zweiten Welle 2 als Außenwelle. Von diesen beiden Wellen 1, 2 sind lediglich die Abschnitte an einem Ende dargestellt. Die aus den beiden Wellen 1 und 2 bestehende Nockenwelle besitzt erste Nocken, die fest mit der ersten Welle verbunden und zweite Nocken die mit der zweiten Welle verbunden sind, so dass diese Nocken durch eine Drehwinkelverstellung der beiden Wellen 1, 2 gegeneinander verdreht werden können. Die Nocken und deren Befestigung an den beiden Wellen 1, 2 sind in der Zeichnung nicht dargestellt.A camshaft consists of coaxially superimposed shafts, namely a first shaft 1 as an inner shaft and a second shaft 2 as an outer shaft. Of these two shafts 1, 2, only the sections are shown at one end. The consisting of the two shafts 1 and 2 camshaft has first cam, which are fixedly connected to the first shaft and second cam which are connected to the second shaft, so that these cams can be rotated by a rotation angle adjustment of the two shafts 1, 2 against each other. The cams and their attachment to the two shafts 1, 2 are not shown in the drawing.

Die beiden Wellen 1, 2 sind jeweils mit einem getrennt betätigbaren Stellantrieb verbunden und zwar die erste Welle 1 mit einem ersten Stellantrieb 3 und die zweite Welle 2 mit einem zweiten Stellantrieb 4. Beide Stellantriebe 3, 4 sind als Taumelscheibenantriebe ausgebildet.The two shafts 1, 2 are each connected to a separately operable actuator namely the first shaft 1 with a first actuator 3 and the second shaft 2 with a second actuator 4. Both actuators 3, 4 are designed as swash plate drives.

Mit der zweiten Welle 2 ist ein durchmessermäßig gestufter Ring 5 fest verbunden und dabei ist die feste Verbindung in dem Ringabschnitt mit dem geringen Durchmesser gegeben, während der Bereich mit dem größeren Durchmesser die beiden Stellantriebe 3, 4 umschließt, von denen dieser Bereich ein nachfolgend noch näher beschriebener Bestandteil ist.With the second shaft 2, a diameter-moderately stepped ring 5 is fixedly connected, while the fixed connection is made in the small-diameter ring section, while the larger-diameter section encloses the two actuators 3, 4, of which this section is one below is more detailed component.

Jeder der beiden Stellantriebe 3, 4 besteht aus folgenden Bestandteilen.Each of the two actuators 3, 4 consists of the following components.

Eine Taumelscheibe 3', 4' lagert drehbar auf einem Taumelscheibenlager 3''; 4''. Die Taumelscheibenlager 3''; 4" werden jeweils über eine Stell-Antriebswelle, nämlich eine erste und zweite Stell-Antriebswelle 3'''; 4''' angetrieben. Die erste Antriebswelle 3''' lagert koaxial innerhalb der als Hohlwelle ausgebildeten zweiten Antriebswelle 4'''. Das erste Taumelscheiben-Lager 3" lagert drehbar auf einer fest mit der ersten Welle 1 verbundenen ersten Achse 6. Fest verbunden mit der ersten Welle 1 ist eine Ringscheibe 7.A swash plate 3 ', 4' rotatably supports on a swash plate bearing 3 ''; 4 ''. The swash plate bearings 3 ''; 4 "are each driven via an actuating drive shaft, namely a first and second actuating drive shaft 3 '' '; 4' ''. The first drive shaft 3 '' 'coaxially supports within the second drive shaft 4' '' designed as a hollow shaft. The first swash plate bearing 3 "rotatably supports on a fixedly connected to the first shaft 1 first axis 6. Fixedly connected to the first shaft 1 is an annular disc. 7

Bei den Taumelscheiben 3'; 4' sind an deren jeweiligem Außenumfang Mitnehmern 3IV; 4IV vorgesehen, die nach radial außen abstehen. Diese Mitnehmer 3IV; 4IV greifen in eine Längsnut 8 in dem Innenumfang des Ringes 5 in dessen durchmessergroßen Abschnitt ein, wobei diese Längsnut parallel zu der gemeinsamen Achse der ersten und zweiten Welle 1, 2 verläuft. Bei Vorhandensein von mehreren auf dem Umfang der Taumelscheiben 3', 4' verteilten Mitnehmern 3IV; 4IV ist eine entsprechende Anzahl von Längsnuten 8 vorgesehen. In ihrem radial äußeren Seitenbereich sind die beiden Taumelscheiben 3', 4' jeweils mit einem Zahnkranz nämlich einem ersten und zweiten Zahnkranz 3V; 4V versehen. Diese Zahnkränze 3V; 4V greifen in jeweils zugeordnete Zahnkränze ein. Bei dem ersten Stellantrieb 3 befindet sich ein solcher zugeordneter Zahnkranz 7' an der Ringscheibe 7.In the swash plates 3 '; 4 'are at their respective outer periphery drivers 3 IV ; 4 IV provided, which protrude radially outward. These drivers 3 IV ; 4 IV engage in a longitudinal groove 8 in the inner periphery of the ring 5 in its large diameter portion, said longitudinal groove parallel to the common axis of the first and second shaft 1, 2 extends. In the presence of several on the circumference of the swash plates 3 ', 4' distributed drivers 3 IV ; 4 IV a corresponding number of longitudinal grooves 8 is provided. In your radially outer side region, the two swash plates 3 ', 4' each with a ring gear namely a first and second ring gear 3 V ; 4 V provided. These sprockets 3 V ; 4 V engage in each assigned sprockets. In the first actuator 3, such an associated sprocket 7 'is located on the annular disk 7.

Der zweite Zahnkranz 4V der zweiten Taumelscheibe 4' kämmt in einem Zahnkranz 9' einer Ringhülse 9. Die Ringhülse 9 ist fest verbunden mit einem Zahnrad 10 eines Nockenwellen-Hauptantriebes. Dieser Hauptantrieb besitzt als Antriebsquelle eine Kurbelwelle eines Verbrennungsmotors, von der das Zahnrad 10 über eine nicht dargestellte Antriebskette angetrieben wird. Auf einer fest mit der Ringhülse 9 verbundenen zweiten Achse 11 des zweiten Stellantriebes 4 ist das zweite Taumelscheibenlager 4'' drehbar gelagert.The second ring gear 4 V of the second swash plate 4 'meshes in a ring gear 9' of an annular sleeve 9. The annular sleeve 9 is fixedly connected to a gear 10 of a camshaft main drive. This main drive has as a drive source, a crankshaft of an internal combustion engine, of which the gear 10 is driven by a drive chain, not shown. On a fixedly connected to the annular sleeve 9 second axis 11 of the second actuator 4, the second swash plate bearing 4 '' is rotatably mounted.

Die beiden Stell-Antriebswellen 3''' und 4''' sind Bestandteil zweier elektrischer Stellmotoren, die in der Zeichnung nicht dargestellt sind.The two adjusting drive shafts 3 '' 'and 4' '' are part of two electric servomotors, which are not shown in the drawing.

Bei den beiden Stellantrieben 3, 4 wirken die Taumelscheiben 3'; 4' zusammen mit den Zahnkränzen 7' und 9', mit denen sie zusammenwirken, als Reduziergetriebe.In the two actuators 3, 4, the swash plates 3 'act; 4 'together with the sprockets 7' and 9 ', with which they interact as a reduction.

Der verstellbare Nockenwellenantrieb funktioniert wie folgt.The adjustable camshaft drive works as follows.

Für den Fall inaktiv geschalteter Stellantriebe 3, 4 erfolgt über das Zahnrad 10 ein Antrieb beider Wellen 1, 2 mit gleicher Drehzahl.In the case of inactive switched actuators 3, 4 takes place via the gear 10, a drive of both shafts 1, 2 at the same speed.

Erfolgt bei einem inaktiven ersten Stellantrieb 3 eine Verstellung durch den zweiten Stellantrieb 4, so werden beide Wellen 1, 2 mit einem gleichen Drehwinkel gegenüber dem Zahnrad 10 drehwinkelverstellt.If an adjustment is made by the second actuator 4 in the case of an inactive first actuator 3, then both shafts 1, 2 are adjusted in angle of rotation with an identical angle of rotation with respect to the gear 10.

Für eine gegenseitige Verstellung der Wellen 1, 2 sorgt der erste Stellantrieb 3.For a mutual adjustment of the shafts 1, 2, the first actuator 3 provides.

Auf diese Weise können auf einfache Weise durch eine entsprechende Steuerung der Stellantriebe 3, 4 die Wellen 1 und 2 gegeneinander und gemeinsam gegenüber dem über das Zahnrad 10 angreifenden Hauptantrieb drehwinkelverstellt werden.In this way, the shafts 1 and 2 can be rotational angle adjusted in a simple manner by a corresponding control of the actuators 3, 4 against each other and together with respect to the engaging via the gear 10 main drive.

Alle in der Beschreibung und in den nachfolgenden Ansprüchen dargestellten Merkmale können sowohl einzeln als auch in beliebiger Form miteinander kombiniert erfindungswesentlich sein.All features described in the description and in the following claims can be essential to the invention, both individually and in any desired form.

Claims (5)

  1. A camshaft for, in particular, activation of the gas exchange valves of an internal combustion engine, comprising
    - two coaxially mounted shafts rotatable in and against one another, namely a first and a second shaft (1; 2),
    - first cams fixedly attached to the first shaft (1) and second cams fixedly attached to the second shaft (2),
    - a main camshaft drive acting on both shafts (1, 2),
    - and a device for adjusting the angle of rotation of the first and second shafts with respect to one another by means of a first actuating drive on the one hand and on the other hand adjusting the angle of rotation of both shafts (1, 2) of the camshaft jointly by a second actuating drive (4),
    characterized by the features
    - the two actuating drives (3, 4) each have a swash-plate mechanism having swash plates 3'; 4', each mounted rotably about the joint camshaft axle on a swash-plate bearing (3"; 4") and each being provided with a gear rim (3V; 4V) and each with at least one engaging piece (3IV; 4IV),
    - the engaging pieces (3IV; 4IV) of the two swash plates (3IV; 4IV) cooperate directly with one of the two shafts (1, 2),
    - of the swash plates (3'; 4'), one cooperates via its respective first gear rim (3V) with one of the two shafts (1; 2) and the other cooperates by its respective second gear rim (4V) with a gear rim (9') of an actuating drive shaft of the main drive.
  2. The camshaft according to Claim 1,
    characterized in that
    the engaging pieces (3IV; 4IV) engage in longitudinal grooves (8) in a ring (5) attached to one of the two shafts (1, 2).
  3. The camshaft according to Claim 1 or 2,
    characterized in that
    both swash-plate bearings (3"; 4") rotate about the joint axis of the two shafts (1, 2).
  4. The camshaft according to any one of the preceding claims,
    characterized in that
    the two actuating drives (3, 4) comprise drive shafts (3"'; 4"') that are designed to be coaxial with one another and act on the swash-plate bearings (3"; 4").
  5. The camshaft according to any one of the preceding claims, having a control device for any adjustment of the angle of rotation of the two shafts (1, 2) with respect to one another and/or jointly with respect to the camshaft main drive.
EP06125818A 2005-12-21 2006-12-11 Camshaft Expired - Fee Related EP1803904B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005061187A DE102005061187A1 (en) 2005-12-21 2005-12-21 camshaft

Publications (3)

Publication Number Publication Date
EP1803904A2 EP1803904A2 (en) 2007-07-04
EP1803904A3 EP1803904A3 (en) 2009-04-08
EP1803904B1 true EP1803904B1 (en) 2010-04-07

Family

ID=38033326

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06125818A Expired - Fee Related EP1803904B1 (en) 2005-12-21 2006-12-11 Camshaft

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US (1) US7421992B2 (en)
EP (1) EP1803904B1 (en)
DE (2) DE102005061187A1 (en)

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Publication number Priority date Publication date Assignee Title
WO2009067789A1 (en) * 2007-11-26 2009-06-04 Magna Powertrain Inc. Concentric camshaft with electric phase drive
GB2472054B (en) * 2009-07-23 2013-02-27 Mechadyne Plc Phaser assembly for an internal combustion engine
WO2011042392A1 (en) * 2009-10-05 2011-04-14 Schaeffler Technologies Gmbh & Co. Kg Camshaft arrangement
CN102549240B (en) * 2009-10-05 2014-06-11 谢夫勒科技股份两合公司 Camshaft arrangement
DE102011006691A1 (en) * 2011-04-04 2012-10-04 Schaeffler Technologies Gmbh & Co. Kg Phaser
DE102011116130A1 (en) * 2011-10-15 2013-04-18 Volkswagen Aktiengesellschaft Valve train for an internal combustion engine
US9297283B2 (en) 2012-05-18 2016-03-29 Schaeffler Technologies AG & Co. KG Camshaft unit
US9638306B2 (en) 2012-05-18 2017-05-02 Schaeffler Technologies AG & Co. KG Camshaft unit
DE102021114162B4 (en) 2021-06-01 2022-12-08 Schaeffler Technologies AG & Co. KG Electromechanical camshaft adjuster

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Publication number Priority date Publication date Assignee Title
US4294218A (en) * 1978-10-26 1981-10-13 Caterpillar Tractor Co. Differential timing altering mechanism for fuel injectors
DE59302331D1 (en) * 1992-08-13 1996-05-30 Bayerische Motoren Werke Ag Reciprocating piston internal combustion engine with two gas exchange valves per cylinder
DE19514786C2 (en) * 1995-04-21 2002-08-14 Audi Ag Device for discrete adjustment of the phase position of at least two camshafts
DE10038354C2 (en) * 2000-08-05 2003-03-20 Atlas Fahrzeugtechnik Gmbh Control device for adjusting the angle of rotation of a camshaft
GB2369175A (en) * 2000-11-18 2002-05-22 Mechadyne Plc Variable phase coupling
DE10222475A1 (en) * 2002-05-22 2003-12-04 Atlas Fahrzeugtechnik Gmbh Gearbox with two interlocking turntables that are connected by a swashplate
DE102004020124A1 (en) * 2004-04-24 2005-11-17 Aft Atlas Fahrzeugtechnik Gmbh Device for adjusting valve timing and internal combustion engine with such a device

Also Published As

Publication number Publication date
DE102005061187A1 (en) 2007-06-28
EP1803904A3 (en) 2009-04-08
DE502006006633D1 (en) 2010-05-20
US20070137598A1 (en) 2007-06-21
EP1803904A2 (en) 2007-07-04
US7421992B2 (en) 2008-09-09

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