EP1509684B1 - Device for effecting the relative angular adjustment between two rotating elements - Google Patents

Device for effecting the relative angular adjustment between two rotating elements Download PDF

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Publication number
EP1509684B1
EP1509684B1 EP03722513A EP03722513A EP1509684B1 EP 1509684 B1 EP1509684 B1 EP 1509684B1 EP 03722513 A EP03722513 A EP 03722513A EP 03722513 A EP03722513 A EP 03722513A EP 1509684 B1 EP1509684 B1 EP 1509684B1
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EP
European Patent Office
Prior art keywords
rotor
rotating elements
actuator
relative angular
control 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
EP03722513A
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German (de)
French (fr)
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EP1509684A1 (en
Inventor
Alexander Von Gaisberg-Helfenberg
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Mercedes Benz Group AG
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Daimler AG
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Publication of EP1509684A1 publication Critical patent/EP1509684A1/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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2800/00—Methods of operation using a variable valve timing mechanism
    • F01L2800/12—Fail safe operation

Definitions

  • the invention relates to a device for relative angular displacement between two rotating, drive-connected elements according to the preamble of claim 1.
  • From the DE 100 36 275 A1 is a generic device for relative angular displacement between a camshaft and a crankshaft of an internal combustion engine known.
  • the camshaft is assigned in the drive of the crankshaft a sprocket, which drives the camshaft through the intermediary of a transmission member.
  • the transmission member makes it possible to set a change in the relative angular position of the two rotating elements. This change is effected by an electric actuator whose rotor acts on a control shaft of the transmission member and which rotates in any operating state of the device.
  • the invention has for its object to provide a device in which the actuator has a low electrical energy consumption and the device safe emergency.
  • a significant advantage of the invention is that in normal operation, the transmission member can be blocked with unchanged relative angular position of the two rotating elements and the actuator requires no energy. This leads to an overall lower energy consumption and thus to a lower heat load of the actuator. Should it nevertheless come to an impermissible heating of the actuator, this can be stopped when the engine is running for cooling, without leading to an uncontrolled adjustment of the relative angular position of the two rotating elements.
  • an automatic blocking of the transmission element thus a trouble-free emergency is guaranteed.
  • 1 denotes a rotating element, which is designed as a camshaft.
  • the rotating element 1 is in the drive of a crankshaft, not shown, of the internal combustion engine, a further rotating element 2, which is designed as a sprocket assigned.
  • the rotating element 2 drives the rotating element 1 through the intermediary of a transmission member 3, so that the rotating element 1 and the rotating element 2 have the same rotational speed.
  • the bearing at its periphery a chain, rotating element 2 is arranged concentrically to the rotating element 1 and encloses this, wherein the transmission member 3 is located between the rotating element 1 and the rotating element 2.
  • This transfer member 3 can, for example, as a planetary gear, swash plate mechanism o.ä. be formed and has an actuating shaft 4, which is acted upon by a rotor 5a of an electric actuator 5.
  • the drive torque required for adjusting is generated between the rotor 5a and a stator 5b of the actuator 5.
  • control shaft 4 is according to the invention with one of the rotating elements 1 or 2 operatively connected, wherein in the embodiment, the operative connection between the adjusting shaft 4 and rotating element 2 is shown.
  • the operative connection of the control shaft 4 with the rotating element 2 is effected by the rotor 5a of the actuator 5, which is connected axially displaceable with the control shaft 4.
  • the transmission member 3 is blocked, whereby the relative angular position of the two rotating elements 1 and 2 remains constant.
  • an axial force component F A2 between the stator 5b and the rotor 5a of the actuator 5 is effective. This can be done, for example, by an axial offset 7 between the stator 5b and the rotor 5a, since the magnetic force action between the rotor 5a and the stator 5b causes this axial force component F A2 through this offset 7.
  • the rotor 5a In order to store the rotor 5a not fixed to the housing and thereby to generate friction losses, the rotor 5a is mounted on the rotating element 1, wherein a bearing on another rotating element, such as the control shaft 4, is conceivable.
  • the operative connection between the control shaft 4 and one of the rotating elements 1, 2 can also be done by a not shown here, to be controlled separately component.
  • the component may be formed as a frictional connection element, such as a brake, and / or as a positive connection element, such as a clutch, and / or a frictional connection element, such as a magnetic coupling.
  • Each of the above-described active connection options can advantageously be effected by friction.

Abstract

The invention relates to a device for effecting the relative angular adjustment between two rotating, drive-connected elements that are connected via a transmission element. Said transmission element comprises a setting shaft, is acted upon by a rotor of an electric actuator and, by altering its position relative to the rotating elements, enables the relative angular position of these rotating elements to be altered. The aim of the invention is to design a device for effecting the relative angular adjustment between two rotating elements in which the actuator has a low electrical power consumption, and the device has a reliable emergency operation. To this end, the invention provides that the setting shaft can be actively connected to at least one of the rotating elements.

Description

Die Erfindung betrifft eine Vorrichtung zur relativen Winkelverstellung zwischen zwei rotierenden, antriebsverbundenen Elementen gemäss dem Oberbegriff des Anspruches 1.The invention relates to a device for relative angular displacement between two rotating, drive-connected elements according to the preamble of claim 1.

Vorrichtungen der eingangs genannten Art sind beispielsweise bei Brennkraftmaschinen bekannt und werden dort zur relativen Winkelverstellung der Nockenwelle gegenüber der diese antreibenden Kurbelwelle vorgesehen. Durch diesen Eingriff in die Ventiltriebskinematik werden die Phasenlage der Ventilöffnung, die Öffnungsdauer und der Ventilhub in Grenzen variabel beeinflusst.Devices of the type mentioned are known for example in internal combustion engines and are there provided for the relative angular displacement of the camshaft relative to this driving crankshaft. As a result of this intervention in the valve train kinematics, the phase position of the valve opening, the opening duration and the valve lift are variably influenced within limits.

Aus der DE 100 36 275 A1 ist eine gattungsgemässe Vorrichtung zur relativen Winkelverstellung zwischen einer Nockenwelle und einer Kurbelwelle einer Brennkraftmaschine bekannt. Der Nockenwelle ist im Antrieb von der Kurbelwelle ein Kettenrad zugeordnet, das die Nockenwelle unter Vermittlung eines Übertragungsgliedes antreibt. Das Übertragungsglied erlaubt es eine Veränderung der relativen Winkelstellung der beiden rotierenden Elemente einzustellen. Diese Veränderung wird durch einen elektrischen Stellantrieb bewirkt, dessen Rotor eine Stellwelle des Übertragungsgliedes beaufschlagt und der in jedem Betriebszustand der Vorrichtung mitdreht.From the DE 100 36 275 A1 is a generic device for relative angular displacement between a camshaft and a crankshaft of an internal combustion engine known. The camshaft is assigned in the drive of the crankshaft a sprocket, which drives the camshaft through the intermediary of a transmission member. The transmission member makes it possible to set a change in the relative angular position of the two rotating elements. This change is effected by an electric actuator whose rotor acts on a control shaft of the transmission member and which rotates in any operating state of the device.

Bei durch Schwingungen ausgelösten Trägheitskräften auf den Rotor des Stellantriebes oder die Stellwelle des Übertragungsgliedes können unerwünschte Verstellungen der relativen Winkelstellung erfolgen. Dies muss vom Stellantrieb ausgeregelt werden und erfordert einen permanenten Energieeinsatz. Bei Ausfall des Stellantriebs ist diese Funktion nicht mehr möglich, es erfolgen unkontrollierte Verstellungen, die den Betrieb der Brennkraftmaschine erschweren und möglicherweise die Brennkraftmaschine beschädigen können. Da der Stellantrieb permanent mitlaufen muss, kann sich dieser auch im Normalbetrieb unzulässig erwärmen. In einem solchen Fall müsste die Brennkraftmaschine um eine Beschädigung des Stellantriebes zu vermeiden, stillgesetzt werden.When triggered by vibrations inertial forces on the rotor of the actuator or the control shaft of the transmission element undesirable adjustments of the relative angular position can be done. This must be corrected by the actuator and requires a permanent use of energy. In case of failure of the actuator, this function is no longer possible, there are uncontrolled adjustments that complicate the operation of the engine and possibly can damage the engine. Since the actuator must run permanently, this can heat up inadmissible even in normal operation. In such a case, the internal combustion engine would have to be shut down to avoid damage to the actuator.

Zum allgemeinen technischen Hintergrund wird noch auf die DE 100 38 354 A1 und die DE 41 10 195 A1 verwiesen.The general technical background is still on the DE 100 38 354 A1 and the DE 41 10 195 A1 directed.

Der Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung zu schaffen, bei welcher der Stellantrieb einen geringen elektrischen Energieverbrauch und die Vorrichtung einen sicheren Notlauf aufweist.The invention has for its object to provide a device in which the actuator has a low electrical energy consumption and the device safe emergency.

Diese Aufgabe wird erfindungsgemäss durch die im Kennzeichen des Patentanspruchs 1 gegebenen Merkmale gelöst.This object is achieved by the given in the characterizing part of claim 1 features.

Ein wesentlicher Vorteil der Erfindung besteht darin, dass im Normalbetrieb das Übertragungsglied bei unveränderter relativer Winkelstellung der beiden rotierenden Elemente blockiert werden kann und der Stellantrieb keine Energie benötigt. Dies führt zu einem insgesamt geringeren Energieverbrauch und damit zu einer geringeren Wärmebelastung des Stellantriebes. Sollte es dennoch zu einer unzulässigen Erwärmung des Stellantriebs kommen, kann dieser bei laufender Brennkraftmaschine zur Abkühlung stillgesetzt werden, ohne dass es zu einer unkontrollierten Verstellung der relativen Winkelstellung der beiden rotierenden Elemente führt. In einer besonderen Ausgestaltung der Erfindung, bei der im unbestromten Zustand des Stellantriebes, dessen Rotor mit mindestens einem der rotierenden Elemente wirkverbunden ist, erfolgt bei Ausfall des Stellantriebes eine automatische Blockierung des Übertragungsgliedes, somit ist ein problemloser Notlauf gewährleistet.A significant advantage of the invention is that in normal operation, the transmission member can be blocked with unchanged relative angular position of the two rotating elements and the actuator requires no energy. This leads to an overall lower energy consumption and thus to a lower heat load of the actuator. Should it nevertheless come to an impermissible heating of the actuator, this can be stopped when the engine is running for cooling, without leading to an uncontrolled adjustment of the relative angular position of the two rotating elements. In a particular embodiment of the invention, in which in the de-energized state of the actuator whose rotor is operatively connected to at least one of the rotating elements takes place in case of failure of the actuator, an automatic blocking of the transmission element, thus a trouble-free emergency is guaranteed.

Weitere Ausgestaltungen und Vorteile der Erfindung gehen aus den übrigen Unteransprüchen und der Beschreibung hervor.Further embodiments and advantages of the invention will become apparent from the remaining dependent claims and the description.

Nachstehend wird die Erfindung anhand einer schematisierten, teilweisen Schnittdarstellung erläutert, die einen Ausschnitt aus einem Nockenwellenantrieb einer Brennkraftmaschine mit einer erfindungsgemässen Vorrichtung zeigt.The invention will be explained with reference to a schematic, partial sectional view, which shows a section of a camshaft drive of an internal combustion engine with an inventive device.

In der teilweise im Schnitt gezeigten Schemadarstellung des Nockenwellenantriebes einer Brennkraftmaschine ist mit 1 ein rotierendes Element, das als Nockenwelle ausgebildet ist, bezeichnet. Dem rotierenden Element 1 ist im Antrieb von einer nicht dargestellten Kurbelwelle der Brennkraftmaschine ein weiteres rotierendes Element 2, welches als Kettenrad ausgeführt ist, zugeordnet. Das rotierende Element 2 treibt das rotierende Element 1 unter Vermittlung eines Übertragungsgliedes 3 an, so dass das rotierende Element 1 und das rotierende Element 2 die gleiche Drehzahl aufweisen. Das an seinem Umfang eine Kette tragende, rotierende Element 2 ist konzentrisch zum rotierenden Element 1 angeordnet und umschliesst dieses, wobei das Übertragungsglied 3 zwischen dem rotierenden Element 1 und dem rotierenden Element 2 liegt. Dieses nicht näher dargestellte Übertragungsglied 3 kann beispielsweise als Planetengetriebe, Taumelscheibengetriebe o.ä. ausgebildet sein und weist eine Stellwelle 4 auf, die von einem Rotor 5a eines elektrischen Stellantriebes 5 beaufschlagt wird. Das zum Verstellen erforderliche Antriebsmoment wird zwischen dem Rotor 5a und einem Stator 5b des Stellantriebes 5 erzeugt.In the schematic representation, partially shown in section, of the camshaft drive of an internal combustion engine, 1 denotes a rotating element, which is designed as a camshaft. The rotating element 1 is in the drive of a crankshaft, not shown, of the internal combustion engine, a further rotating element 2, which is designed as a sprocket assigned. The rotating element 2 drives the rotating element 1 through the intermediary of a transmission member 3, so that the rotating element 1 and the rotating element 2 have the same rotational speed. The bearing at its periphery a chain, rotating element 2 is arranged concentrically to the rotating element 1 and encloses this, wherein the transmission member 3 is located between the rotating element 1 and the rotating element 2. This transfer member 3, not shown, can, for example, as a planetary gear, swash plate mechanism o.ä. be formed and has an actuating shaft 4, which is acted upon by a rotor 5a of an electric actuator 5. The drive torque required for adjusting is generated between the rotor 5a and a stator 5b of the actuator 5.

Durch eine Relativdrehung der Stellwelle 4 können die beiden rotierenden Elemente 1, 2 in ihrer relativen Winkelstellung zueinander verändert werden. Die Relativdrehung der Stellwelle 4 wird über den Rotor 5a des Stellantriebes 5 bewirkt.By a relative rotation of the control shaft 4, the two rotating elements 1, 2 are changed in their relative angular position to each other. The relative rotation of the control shaft 4 is effected via the rotor 5a of the actuator 5.

Um einen niedrigen Energieverbrauch und eine zuverlässige Notlauffunktion zu erreichen, ist die Stellwelle 4 erfindungsgemäss mit einem der rotierenden Elemente 1 oder 2 wirkverbindbar, wobei im Ausführungsbeispiel die Wirkverbindung zwischen Stellwelle 4 und rotierendem Element 2 dargestellt ist. Die Wirkverbindung der Stellwelle 4 mit dem rotierenden Element 2 erfolgt durch den Rotor 5a des Stellantriebes 5, der axial verschieblich mit der Stellwelle 4 verbunden ist. Durch die Wirkverbindung der Stellwelle 4 mit dem rotierenden Element 2 wird das Übertragungsglied 3 blockiert, wodurch die relative Winkelstellung der beiden rotierenden Elemente 1 und 2 konstant bleibt.In order to achieve low energy consumption and reliable emergency operation, the control shaft 4 is according to the invention with one of the rotating elements 1 or 2 operatively connected, wherein in the embodiment, the operative connection between the adjusting shaft 4 and rotating element 2 is shown. The operative connection of the control shaft 4 with the rotating element 2 is effected by the rotor 5a of the actuator 5, which is connected axially displaceable with the control shaft 4. By the operative connection of the control shaft 4 with the rotating element 2, the transmission member 3 is blocked, whereby the relative angular position of the two rotating elements 1 and 2 remains constant.

Bei unbestromtem Stellantrieb ist der Rotor 5a mit dem rotierenden Element 2 wirkverbunden. Die Wirkverbindung zwischen Rotor 5a und rotierendem Element 2 erfolgt durch eine Axialkraftbeaufschlagung FA1 des Rotors 5a, wobei die Beaufschlagung mittels einer Tellerfeder 6 erzeugt wird. Zur Erzeugung dieser Axialkraft FA1 können auch andere Wirkprinzipien herangezogen werden.When energized actuator, the rotor 5a is operatively connected to the rotating element 2. The operative connection between the rotor 5a and the rotating element 2 takes place by an axial force F A1 of the rotor 5 a, the application being effected by means of a disk spring 6. To generate this axial force F A1 , other principles of action can also be used.

Bei bestromtem Stellantrieb ist die Wirkverbindung zwischen Rotor 5a und rotierendem Element 2 gelöst um die elektrische Antriebsleistung des Stellantriebs 5 gering zu halten. Vorteilhafterweise ist bei bestromtem Stellantrieb 5 eine Axialkraftkomponente FA2 zwischen Stator 5b und Rotor 5a des Stellantriebes 5 wirksam. Dies kann beispielsweise durch einen Axialversatz 7 zwischen Stator 5b und Rotor 5a erfolgen, da durch diesen Versatz 7 die Magnetkraftwirkung zwischen Rotor 5a und Stator 5b diese Axialkraftkomponente FA2 hervorruft.When energized actuator the operative connection between the rotor 5a and rotating element 2 is solved to keep the electric drive power of the actuator 5 low. Advantageously, when the actuator 5 is energized, an axial force component F A2 between the stator 5b and the rotor 5a of the actuator 5 is effective. This can be done, for example, by an axial offset 7 between the stator 5b and the rotor 5a, since the magnetic force action between the rotor 5a and the stator 5b causes this axial force component F A2 through this offset 7.

Um den Rotor 5a nicht gehäusefest zu lagern und dadurch Reibungsverluste zu erzeugen, ist der Rotor 5a auf dem rotierenden Element 1 gelagert, wobei auch eine Lagerung auf einem anderen rotierenden Element, wie beispielsweise der Stellwelle 4, denkbar ist.In order to store the rotor 5a not fixed to the housing and thereby to generate friction losses, the rotor 5a is mounted on the rotating element 1, wherein a bearing on another rotating element, such as the control shaft 4, is conceivable.

Die Wirkverbindung zwischen der Stellwelle 4 und einem der rotierenden Elemente 1, 2 kann auch durch ein hier nicht dargestelltes, separat anzusteuerndes Bauteil erfolgen. Das Bauteil kann als reibschlüssiges Verbindungselement, wie beispielsweise eine Bremse, und/oder als formschlüssiges Verbindungselement, wie beispielsweise eine Kupplung, und/oder ein kraftschlüssiges Verbindungselement, wie beispielsweise eine Magnetkupplung, ausgebildet sein.The operative connection between the control shaft 4 and one of the rotating elements 1, 2 can also be done by a not shown here, to be controlled separately component. The component may be formed as a frictional connection element, such as a brake, and / or as a positive connection element, such as a clutch, and / or a frictional connection element, such as a magnetic coupling.

Jede der oben beschrieben Wirkverbindungsmöglichkeiten kann vorteilhafterweise reibschlüssig erfolgen.Each of the above-described active connection options can advantageously be effected by friction.

Claims (13)

  1. Device for effecting the relative angular adjustment between two drive-connected rotating elements (1, 2) which are connected via a transmission member (3) with a control shaft (4), which is capable of being acted on via a rotor (5a) of an electric actuator (5) and by means of which the relative angular position of the rotating elements (1, 2) can be changed by altering its position relative thereto,
    characterised in that
    the control shaft (4) is in switchable active connection with at least one of the rotating elements (1, 2).
  2. Device according to claim 1,
    characterised in that
    the relative angular position of the two rotating elements (1, 2) remains substantially constant owing to the active connection of the control shaft (4) with one of the rotating elements (1, 2).
  3. Device according to claim 1 or 2,
    characterised in that
    the active connection of the control shaft (4) with one of the rotating elements (1, 2) is effected by the rotor (5a) of the actuator (5).
  4. Device according to claim 3,
    characterised in that
    the rotor (5a) is in active connection with at least one of the rotating elements (1, 2) while no current is applied to the actuator (5).
  5. Device according to claim 3 or 4,
    characterised in that
    the active connection between the rotor (5a) and the rotating element (1, 2) is effected by an axial force (FA1) being applied to the rotor (5a).
  6. Device according to claim 3,
    characterised in that
    the active connection is cancelled while a current is applied to the actuator (5).
  7. Device according to claim 3 or 6,
    characterised in that
    an axial force (FA2) acts between a stator (5b) and the rotor (5a) of the electric actuator (5) while a current is applied to the actuator (5).
  8. Device according to claim 7,
    characterised in that
    the action of the actual force (FA2) between the stator (5b) and the rotor (5a) is caused by an axial offset (7) between the stator (5b) and the rotor (5a).
  9. Device according to any of the preceding claims,
    characterised in that
    the rotor (5a) of the electric actuator (5) is bearing-mounted on one of the rotating elements (1, 2).
  10. Device according to any of the preceding claims,
    characterised in that
    the rotor (5a) of the electric actuator (5) is directly connected to a control shaft (4).
  11. Device according to claim 1,
    characterised in that
    the active connection between the control shaft (4) and the rotating element (1, 2) is effected by a separately driven component.
  12. Device according to claim 11,
    characterised in that
    the separately driven component effects a frictional and/or positive and/or non-positive connection.
  13. Device according to any of the preceding claims,
    characterised in that
    the active connection is a frictional connection.
EP03722513A 2002-06-01 2003-04-19 Device for effecting the relative angular adjustment between two rotating elements Expired - Fee Related EP1509684B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE2002124446 DE10224446A1 (en) 2002-06-01 2002-06-01 Device for relative angular adjustment between two rotating elements
DE10224446 2002-06-01
PCT/EP2003/004105 WO2003102381A1 (en) 2002-06-01 2003-04-19 Device for effecting the relative angular adjustment between two rotating elements

Publications (2)

Publication Number Publication Date
EP1509684A1 EP1509684A1 (en) 2005-03-02
EP1509684B1 true EP1509684B1 (en) 2009-06-03

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Application Number Title Priority Date Filing Date
EP03722513A Expired - Fee Related EP1509684B1 (en) 2002-06-01 2003-04-19 Device for effecting the relative angular adjustment between two rotating elements

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EP (1) EP1509684B1 (en)
JP (1) JP4370244B2 (en)
DE (2) DE10224446A1 (en)
WO (1) WO2003102381A1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014008155A1 (en) 2014-05-30 2015-12-17 Daimler Ag Camshaft adjusting device

Also Published As

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WO2003102381A1 (en) 2003-12-11
JP4370244B2 (en) 2009-11-25
DE10224446A1 (en) 2003-12-11
DE50311576D1 (en) 2009-07-16
JP2005528551A (en) 2005-09-22
EP1509684A1 (en) 2005-03-02

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