EP2550437B1 - Control valve of a phasing device for adjusting the phase of a camshaft relative to the crankshaft in an internal combustion engine - Google Patents

Control valve of a phasing device for adjusting the phase of a camshaft relative to the crankshaft in an internal combustion engine Download PDF

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Publication number
EP2550437B1
EP2550437B1 EP11704574.0A EP11704574A EP2550437B1 EP 2550437 B1 EP2550437 B1 EP 2550437B1 EP 11704574 A EP11704574 A EP 11704574A EP 2550437 B1 EP2550437 B1 EP 2550437B1
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EP
European Patent Office
Prior art keywords
control valve
camshaft
fluid
fluid line
actuator
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.)
Not-in-force
Application number
EP11704574.0A
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German (de)
French (fr)
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EP2550437A1 (en
Inventor
Alexander Draheim
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.)
Schaeffler Technologies AG and Co KG
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Schaeffler Technologies AG and Co KG
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Publication of EP2550437A1 publication Critical patent/EP2550437A1/en
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Publication of EP2550437B1 publication Critical patent/EP2550437B1/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
    • 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
    • F01L1/3442—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 hydraulic chambers with variable volume to transmit the rotating force
    • 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
    • F01L1/3442—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 hydraulic chambers with variable volume to transmit the rotating force
    • F01L2001/34423—Details relating to the hydraulic feeding circuit
    • F01L2001/34426—Oil control valves
    • 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
    • F01L1/3442—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 hydraulic chambers with variable volume to transmit the rotating force
    • F01L2001/34423—Details relating to the hydraulic feeding circuit
    • F01L2001/34426—Oil control valves
    • F01L2001/34433—Location oil control valves
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/86493—Multi-way valve unit
    • Y10T137/86574—Supply and exhaust
    • Y10T137/8667—Reciprocating valve

Definitions

  • the invention relates to a control valve of a device for changing the relative angular position of a camshaft relative to a crankshaft of an internal combustion engine, wherein the control valve in a region facing the camshaft having a fluid conduit for supplying pressurized fluid, wherein the control valve in an axial center region two fluid conduits to Supply and discharge of pressurized fluid to at least two hydraulic chambers, wherein the hydraulic chambers between a drive element and the camshaft are operatively arranged to set a defined relative rotational position between the drive element and the camshaft, and wherein the control valve in one of the camshaft remote area has a fluid line for the removal of fluid to a tank.
  • the fluid line for the removal of fluid in a preferably hollow cylindrical portion of the control valve is formed as at least one extending through the preferably hollow cylindrical portion to the outside of the portion recess, wherein in the preferably hollow cylindrical portion of the control valve, a control piston is arranged, which at its from the camshaft end facing away from an armature tappet of an actuator is contacted.
  • Camshaft adjusters particularly those that operate hydraulically, are well known in the art.
  • an impeller is present in which wings are molded or arranged.
  • the wings are located in hydraulic chambers, which are incorporated in an outer rotor (usually referred to as a stator).
  • an adjustment of the inner rotor can take place relative to the stator between an "early stop” and a "late stop”.
  • a generic control valve which is designed as an electrically controlled directional control valve.
  • a control valve is in the DE 10 2008 004 591 A1 disclosed. Shown is a control valve consisting of a housing cavity opening with a slightly conical edge on the axially facing an actuator end. The discharged fluid exits the control valve in an axial, slightly oblique direction. The slightly conical edge encloses an angle of approximately 20 ° (GRAD) relative to the axial direction.
  • the DE 196 11 365 A1 also shows a control valve.
  • the control valve has a fluid line in a region facing away from the camshaft.
  • the fluid line serves to remove fluid to a tank.
  • the fluid conduit is formed as a recess extending through the hollow cylindrical portion to the outside of the portion.
  • the EP 2 365 193 A1 discloses another control valve. Shown is a control valve with a fluid line for supplying pressurized fluid, wherein the fluid line is arranged in a camshaft facing region of the control valve. In a central area, two supply connections are arranged. In a region facing away from the camshaft region, a further fluid conduit is arranged, wherein the Fluid line of the discharge of pressurized fluid is used to a tank.
  • the fluid line in a preferably hollow-cylindrical section of the control valve is designed as at least one recess extending through a hollow-cylindrical section to the outside of the section.
  • a control piston is arranged, which is contacted at its end facing away from the camshaft end of an armature tappet of an actuator.
  • Another control valve shows the DE 10 2008 004 591 A1 ,
  • a control valve that from a high pressure area pressure oil is passed through a fluid line, which is formed by at least one bore in the control valve, in a camshaft facing portion of the valve into the interior of the valve.
  • the valve has controls that allow the pressure oil to be fed into two fluid lines in the axial center area of the valve, which are in fluid communication with the hydraulic chambers of the camshaft phaser.
  • the relative rotation of the stator of the camshaft adjuster can be made to the camshaft, which is well known.
  • the oil is then fed back into a tank in a region of the valve facing away from the camshaft.
  • DE 10 2008 004 591 A1 provides for this that the oil inside the control valve and in particular by the interior of a control piston (valve piston) out and is derived in the axial end of the control piston by piston cavity openings concentrically from the valve. Ie. the oil drainage takes place axially through the control valve running as the central valve to the tank.
  • a disadvantage of this solution is that in the region of the outflow of the hydraulic oil of the armature plunger of an electromagnetic actuator (central magnet) is arranged, which contacts the control piston and axially displaces in the required manner to the flow of hydraulic oil in the To control camshaft adjuster.
  • an electromagnetic actuator central magnet
  • a further disadvantage is that during operation of the internal combustion engine partially higher temperatures occur in the camshaft adjuster in the region of the central magnet.
  • the present invention has the object, a control valve of the generic type in such a way that it is possible to protect the contact point between the armature plunger of the central magnet and the valve piston from the ingress of contaminants and thus to reduce wear in the camshaft adjuster. Furthermore, a possibility should be created to better cool the central magnet and possibly other attachments.
  • the solution of this object by the invention is characterized in that the at least one recess (11) is radially aligned and at an angle (alpha ⁇ ) between 30 ° and 60 ° to the axial direction (A) extends such that fluid thereby on the end face (18) of the actuator (16) is directed.
  • the at least one recess, in particular the bore is radially aligned according to an embodiment of the invention.
  • the at least one recess, in particular the bore extends at an angle to the axial direction; the angle is preferably between 30 ° and 60 °.
  • a control piston arranged, which is contacted at its side facing away from the camshaft axial end of an armature tappet of an actuator.
  • the fluid line for removing fluid is preferably formed as at least one bore. It can be formed by a plurality of recesses distributed around the circumference of the preferably hollow-cylindrical section, in particular bores.
  • the actuator is preferably designed as an electromagnet.
  • a longitudinal axis of the recess, in particular of the bore, can impinge on an end face of the actuator for cooling.
  • the control valve is preferably designed as a central screw and arranged with a threaded portion in a threaded bore in the camshaft.
  • oil that comes from the camshaft adjuster and is to be discharged into the tank is no longer discharged axially from the end face of the control valve as in the prior art, but by radial or oblique holes outside the contact area between the armature plunger of the central magnet and the valve piston.
  • contaminants present in the oil are conducted away from the contact point armature plunger - valve piston.
  • the invention proposal proposes to cool the central magnet with the oil which is passed to the tank.
  • the oil can be directed in particular through the oil drain holes on the surface of the central magnet, which ensures a corresponding cooling of the central magnet.
  • Fig. 1 is a part of an internal combustion engine sketched, wherein a cylinder head 21 is indicated, in which a camshaft 3 is mounted.
  • the drive of the camshaft 3 via a drive element 9 of a camshaft adjuster 2, wherein the drive element 9 is in (not shown) rotary connection with the (also not shown) crankshaft of the engine.
  • the camshaft adjuster 2 there is a hydraulic adjusting device which can accomplish an angular rotation between the drive element 9 and the camshaft 3 to influence the timing of the internal combustion engine in a known manner.
  • paired (not closer to be recognized) hydraulic chambers between the drive element 9 and the camshaft 3 are effectively arranged, which can be acted upon by pressurized fluid to adjust the said rotation can.
  • Several of these pairs of hydraulic chambers are present over the circumference.
  • the camshaft adjuster 2 thus serves to change the relative angular position of the camshaft 3 relative to the crankshaft of the internal combustion engine.
  • control valve 1 which - formed as a central valve - in an axial end portion has a threaded portion 19 which is screwed into a threaded bore 20 in the camshaft 3.
  • control valve 1 The actuation of the control valve 1 is effected by axial loading of a control piston 1 arranged in the control piston 14, which is acted upon by an electromagnet 16 and in particular of its armature plunger 15 in the axial direction A.
  • the control valve 1 has in a region 4 facing the camshaft 3 (see this Fig. 2 ) a fluid line 5 for supplying pressurized fluid from a high-pressure chamber 22 from.
  • the fluid line 5 comprises a plurality of bores extending in the radial direction r, which enable hydraulic oil to enter the interior of the control valve 1.
  • the control valve 1 has two fluid lines 7 and 8 for supply and discharge of pressurized hydraulic oil in the hydraulic chambers of the camshaft adjuster 2.
  • the control valve 1 In a side facing away from the camshaft 3 region 10 (s. Fig. 2 ), the control valve 1 on a fluid line 11 for the removal of fluid to a tank.
  • Fig. 2 is indicated by arrows as oil flows from the high-pressure chamber 22 ("closed") into the control valve 1. From this, the chambers ("K”) oil is supplied or derived from these. Then the oil flows into the tank (“down").
  • the fluid line 11 is provided for the removal of fluid to the tank in a preferably hollow cylindrical portion 12 of the control valve 1 is, wherein said fluid conduit is formed as at least one extending through the preferably hollow cylindrical portion 12 to the outer side 13 of the portion 12 recess 11.
  • the recess is a bore.
  • the hydraulic oil does not flow out of the control valve 1 in the axial direction and toward the contact of the armature plunger 15 with the control piston 14, but it is discharged radially outward from the control valve 1.
  • the portion 12 is not formed as an ideal hollow cylindrical portion, but that the hollow cylindrical portion has a hexagonal shape on the outside, wherein in each of the six outer sides 13 of the hexagon ever a bore 11 is incorporated, extending at an angle ⁇ to the outside extends.
  • Fig. 4 corresponds largely to that according to Fig. 2 , wherein only the oil drain holes, ie the recesses 11, here in the radial direction r, not at an angle ⁇ .
  • the oil drain holes are made so that the control valve housing is drilled from the outside.
  • the bores are preferably designed or aligned such that they strike the surface of the central magnet.
  • the bores can also be designed or aligned so that they strike the surface of a housing covering the camshaft adjusting system or another component.

Description

Gebiet der ErfindungField of the invention

Die Erfindung betrifft ein Steuerventil einer Vorrichtung zur Veränderung der relativen Winkellage einer Nockenwelle gegenüber einer Kurbelwelle einer Brennkraftmaschine, wobei das Steuerventil in einem der Nockenwelle zugewandten Bereich eine Fluidleitung zur Zuführung von unter Druck stehendem Fluid aufweist, wobei das Steuerventil in einem axialen Mittenbereich zwei Fluidleitungen zur Zu- und Abführung von unter Druck stehendem Fluid zu mindestens zwei Hydraulikkammern aufweist, wobei die Hydraulikkammern zwischen einem Antriebselement und der Nockenwelle wirksam angeordnet sind, um eine definierte relative Drehstellung zwischen dem Antriebselement und der Nockenwelle einzustellen, und wobei das Steuerventil in einem von der Nockenwelle abgewandten Bereich eine Fluidleitung zur Abfuhr von Fluid zu einem Tank aufweist. Die Fluidleitung zur Abfuhr von Fluid in einem vorzugsweise hohlzylindrischen Abschnitt des Steuerventils ist als mindestens eine sich durch den vorzugsweise hohlzylindrischen Abschnitt zur Außenseite des Abschnitts erstreckende Ausnehmung ausgebildet, wobei in dem vorzugsweise hohlzylindrischen Abschnitt des Steuer-ventils ein Steuerkolben angeordnet ist, der an seinem von der Nockenwelle abgewandten Ende von einem Ankerstößel eines Aktuators kontaktiert wird.The invention relates to a control valve of a device for changing the relative angular position of a camshaft relative to a crankshaft of an internal combustion engine, wherein the control valve in a region facing the camshaft having a fluid conduit for supplying pressurized fluid, wherein the control valve in an axial center region two fluid conduits to Supply and discharge of pressurized fluid to at least two hydraulic chambers, wherein the hydraulic chambers between a drive element and the camshaft are operatively arranged to set a defined relative rotational position between the drive element and the camshaft, and wherein the control valve in one of the camshaft remote area has a fluid line for the removal of fluid to a tank. The fluid line for the removal of fluid in a preferably hollow cylindrical portion of the control valve is formed as at least one extending through the preferably hollow cylindrical portion to the outside of the portion recess, wherein in the preferably hollow cylindrical portion of the control valve, a control piston is arranged, which at its from the camshaft end facing away from an armature tappet of an actuator is contacted.

Hintergrund der ErfindungBackground of the invention

Nockenwellenverstellvorrichtungen, insbesondere solche, die hydraulisch arbeiten, sind im Stand der Technik hinlänglich bekannt. Im hydraulischen Nockenwellenversteller ist ein Flügelrad vorhanden, in dem Flügel eingeformt oder angeordnet sind. Die Flügel befinden sich in Hydraulikkammern, die in einem Außenrotor (zumeist als Stator bezeichnet) eingearbeitet sind. Durch entsprechende Beaufschlagung der jeweiligen Seite der Hydraulikkammern mit Hydraulikfluid kann eine Verstellung des Innenrotors (mit der Nockenwelle verbunden) relativ zum Stator zwischen einem "Frühanschlag" und einem "Spätanschlag" erfolgen.Camshaft adjusters, particularly those that operate hydraulically, are well known in the art. In the hydraulic camshaft adjuster an impeller is present in which wings are molded or arranged. The wings are located in hydraulic chambers, which are incorporated in an outer rotor (usually referred to as a stator). By appropriate loading of the respective side of the hydraulic chambers with hydraulic fluid, an adjustment of the inner rotor (connected to the camshaft) can take place relative to the stator between an "early stop" and a "late stop".

Dabei wird der Fluss von Hydrauliköl durch ein gattungsgemäßes Steuerventil gesteuert, das als elektrisch angesteuertes Wegeventil ausgebildet ist. Ein solches Steuerventil wird in der DE 10 2008 004 591 A1 offenbart. Gezeigt ist ein Steuerventil bestehend aus einer Gehäusehohlraumöffnung mit leicht konischem Rand am axial einem Aktuator zugewandten Ende. Das abgeführte Fluid verlässt das Steuerventil in einer axialen, leicht schrägen Richtung. Der leicht konische Rand schließt bezogen auf die Achsrichtung einen Winkel von ca 20° (GRAD) ein.In this case, the flow of hydraulic oil is controlled by a generic control valve, which is designed as an electrically controlled directional control valve. Such a control valve is in the DE 10 2008 004 591 A1 disclosed. Shown is a control valve consisting of a housing cavity opening with a slightly conical edge on the axially facing an actuator end. The discharged fluid exits the control valve in an axial, slightly oblique direction. The slightly conical edge encloses an angle of approximately 20 ° (GRAD) relative to the axial direction.

Die DE 196 11 365 A1 zeigt ebenfalls ein Steuerventil. Das Steuerventil weist in einem von der Nockenwelle abgewandten Bereich eine Fluidleitung auf. Die Fluidleitung dient der Abfuhr von Fluid zu einem Tank. Die Fluidleitung ist als eine sich durch den hohlzylindrischen Abschnitt zur Außenseite des Abschnitts erstreckende Ausnehmung ausgebildet.The DE 196 11 365 A1 also shows a control valve. The control valve has a fluid line in a region facing away from the camshaft. The fluid line serves to remove fluid to a tank. The fluid conduit is formed as a recess extending through the hollow cylindrical portion to the outside of the portion.

Die EP 2 365 193 A1 offenbart eine weiteres Steuerventil. Gezeigt ist ein Steuerventil mit einer Fluidleitung zur Zuführung von unter Druck stehendem Fluid, wobei die Fluidleitung in einem der Nockenwelle zugewandten Bereich des Steuerventils angeordnet ist. In einem Mittenbereich sind zwei Versorgungsanschlüsse angeordnet. In einem von der Nockenwelle abgewandten Bereich ist eine weitere Fluidleitung angeordnet, wobei die Fluidleitung der Abfuhr von unter Druck stehendem Fluid zu einem Tank dient. Die Fluidleitung in einem vorzugsweise hohlzylindrischen Abschnitt des Steuerventils ist als mindestens eine sich durch einen hohlzylindrischen Abschnitt zur Außenseite des Abschnitts erstreckende Ausnehmung ausgebildet. In dem hohlzylindrischen Abschnitt ist ein Steuerkolben angeordnet, der an seinem von der Nockenwelle abgewandten Ende von einem Ankerstößel eines Aktuators kontaktiert wird.The EP 2 365 193 A1 discloses another control valve. Shown is a control valve with a fluid line for supplying pressurized fluid, wherein the fluid line is arranged in a camshaft facing region of the control valve. In a central area, two supply connections are arranged. In a region facing away from the camshaft region, a further fluid conduit is arranged, wherein the Fluid line of the discharge of pressurized fluid is used to a tank. The fluid line in a preferably hollow-cylindrical section of the control valve is designed as at least one recess extending through a hollow-cylindrical section to the outside of the section. In the hollow cylindrical portion, a control piston is arranged, which is contacted at its end facing away from the camshaft end of an armature tappet of an actuator.

Ein weiteres Steuerventil zeigt die DE 10 2008 004 591 A1 . Bei einem solchen Steuerventil ist vorgesehen, dass aus einem Hochdruckbereich Drucköl durch eine Fluidleitung, die durch mindestens eine Bohrung im Steuerventil gebildet wird, in einem der Nockenwelle zugewandten Bereich des Ventils in das Innere des Ventils geleitet wird. Das Ventil verfügt über Steuerelemente, mit denen das Drucköl in zwei Fluidleitungen im axialen Mittenbereich des Ventils gesteuert eingespeist werden kann, die mit den Hydraulikkammern des Nockenwellenverstellers in fluidischer Verbindung stehen. Durch den entsprechenden Fluss von Hydrauliköl in die Hydraulikkammern kann die relative Verdrehung des Stators des Nockenwellenverstellers zur Nockenwelle vorgenommen werden, was hinlänglich bekannt ist. Das Öl wird dann in einem von der Nockenwelle abgewandten Bereich des Ventils wieder in einen Tank zurückgeführt.Another control valve shows the DE 10 2008 004 591 A1 , In such a control valve is provided that from a high pressure area pressure oil is passed through a fluid line, which is formed by at least one bore in the control valve, in a camshaft facing portion of the valve into the interior of the valve. The valve has controls that allow the pressure oil to be fed into two fluid lines in the axial center area of the valve, which are in fluid communication with the hydraulic chambers of the camshaft phaser. By the corresponding flow of hydraulic oil into the hydraulic chambers, the relative rotation of the stator of the camshaft adjuster can be made to the camshaft, which is well known. The oil is then fed back into a tank in a region of the valve facing away from the camshaft.

Die genannte DE 10 2008 004 591 A1 sieht hierfür vor, dass das Öl im Inneren des Steuerventils und insbesondere durch das Innere eines Steuerkolbens (Ventilkolben) geführt und im axialen Endbereich des Steuerkolbens durch Kolbenhohlraumöffnungen konzentrisch aus dem Ventil abgeleitet wird. D. h. der Ölabfluss erfolgt axial durch das als Zentralventil ausgeführte Steuerventil zum Tank.The named DE 10 2008 004 591 A1 provides for this that the oil inside the control valve and in particular by the interior of a control piston (valve piston) out and is derived in the axial end of the control piston by piston cavity openings concentrically from the valve. Ie. the oil drainage takes place axially through the control valve running as the central valve to the tank.

Nachteilig ist bei dieser Lösung, dass im Bereich des Abflusses des Hydrauliköls der Ankerstößel eines elektromagnetischen Aktuators (Zentralmagnet) angeordnet ist, der den Steuerkolben kontaktiert und in der benötigten Weise axial verschiebt, um den Fluss des Hydrauliköls im Nockenwellenversteller zu steuern. Hierdurch wird es Verunreinigungen im Öl (Partikeln) ermöglicht, an die Kontaktstelle zwischen Ankerstößel und Ventilkolben zu gelangen und sich hier abzulagern und so diese verschleißempfindliche Stelle mit Abrasivpartikeln zu beaufschlagen. Die Folge ist ein entsprechender nachteiliger Verschleiß an der Kontaktstelle.A disadvantage of this solution is that in the region of the outflow of the hydraulic oil of the armature plunger of an electromagnetic actuator (central magnet) is arranged, which contacts the control piston and axially displaces in the required manner to the flow of hydraulic oil in the To control camshaft adjuster. As a result, it is possible impurities in the oil (particles) to get to the contact point between the armature plunger and the valve piston and deposit here and so act on this wear-sensitive body with abrasive particles. The result is a corresponding disadvantageous wear at the contact point.

Nachteilig ist ferner, dass im Betrieb der Brennkraftmaschine teilweise höhere Temperaturen im Nockenwellenversteller im Bereich des Zentralmagneten auftreten.A further disadvantage is that during operation of the internal combustion engine partially higher temperatures occur in the camshaft adjuster in the region of the central magnet.

Aufgabe der ErfindungObject of the invention

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, ein Steuerventil der gattungsgemäßen Art so fortzubilden, dass es möglich ist, die Kontaktstelle zwischen dem Ankerstößel des Zentralmagneten und dem Ventilkolben vor dem Zutritt von Verunreinigungen zu schützen und so den Verschleiß im Nockenwellenversteller zu reduzieren. Ferner soll eine Möglichkeit geschaffen werden, den Zentralmagneten und gegebenenfalls weitere Anbauteile besser zu kühlen.The present invention has the object, a control valve of the generic type in such a way that it is possible to protect the contact point between the armature plunger of the central magnet and the valve piston from the ingress of contaminants and thus to reduce wear in the camshaft adjuster. Furthermore, a possibility should be created to better cool the central magnet and possibly other attachments.

Zusammenfassung der ErfindungSummary of the invention

Die Lösung dieser Aufgabe durch die Erfindung ist dadurch gekennzeichnet, dass die mindestens eine Ausnehmung (11) radial ausgerichtet ist und unter einem Winkel (Alpha α) zwischen 30° und 60° zur Achsrichtung (A) derart verläuft, dass Fluid hierdurch auf die Stirnfläche (18) des Aktuators (16) gelenkt wird.The solution of this object by the invention is characterized in that the at least one recess (11) is radially aligned and at an angle (alpha α) between 30 ° and 60 ° to the axial direction (A) extends such that fluid thereby on the end face (18) of the actuator (16) is directed.

Die mindestens eine Ausnehmung, insbesondere die Bohrung, ist nach einer Ausführungsform der Erfindung radial ausgerichtet. Die mindestens eine Ausnehmung, insbesondere die Bohrung, verläuft unter einem Winkel zur axialen Richtung; der Winkel beträgt dabei vorzugsweise zwischen 30° und 60°. In dem vorzugsweise hohlzylindrischen Abschnitt des Steuerventils ist ein Steuerkolben angeordnet, der an seinem von der Nockenwelle abgewandten axialen Ende von einem Ankerstößel eines Aktuators kontaktiert wird.The at least one recess, in particular the bore, is radially aligned according to an embodiment of the invention. The at least one recess, in particular the bore, extends at an angle to the axial direction; the angle is preferably between 30 ° and 60 °. In the preferably hollow cylindrical portion of the control valve is a control piston arranged, which is contacted at its side facing away from the camshaft axial end of an armature tappet of an actuator.

Die Fluidleitung zur Abfuhr von Fluid ist bevorzugt als mindestens eine Bohrung ausgebildet. Sie kann durch mehrere um den Umfang des vorzugsweise hohlzylindrischen Abschnitts herum verteilte Ausnehmungen, insbesondere Bohrungen, ausgebildet sein.The fluid line for removing fluid is preferably formed as at least one bore. It can be formed by a plurality of recesses distributed around the circumference of the preferably hollow-cylindrical section, in particular bores.

Der Aktuator ist dabei bevorzugt als Elektromagnet ausgebildet. Eine Längsachse der Ausnehmung, insbesondere der Bohrung, kann dabei zur Kühlung auf eine Stirnfläche des Aktuators auftreffen.The actuator is preferably designed as an electromagnet. A longitudinal axis of the recess, in particular of the bore, can impinge on an end face of the actuator for cooling.

Das Steuerventil ist bevorzugt als Zentralschraube ausgebildet und mit einem Gewindeabschnitt in einer Gewindebohrung in der Nockenwelle angeordnet.The control valve is preferably designed as a central screw and arranged with a threaded portion in a threaded bore in the camshaft.

Erfindungsgemäß wird also Öl, das vom Nockenwellenversteller kommt und in den Tank abgeleitet werden soll, nicht mehr wie im Stand der Technik axial an der Stirnfläche des Steuerventils abgeführt, sondern durch radiale oder schräge Bohrungen außerhalb des Kontaktbereichs zwischen dem Ankerstößel des Zentralmagneten und dem Ventilkolben. Somit werden im Öl vorhandene Verschmutzungen von der Kontaktstelle Ankerstößel - Ventilkolben weggeleitet.According to the invention, therefore, oil that comes from the camshaft adjuster and is to be discharged into the tank is no longer discharged axially from the end face of the control valve as in the prior art, but by radial or oblique holes outside the contact area between the armature plunger of the central magnet and the valve piston. Thus, contaminants present in the oil are conducted away from the contact point armature plunger - valve piston.

Mit der vorgeschlagenen Ausgestaltung eines Steuerventils eines hydraulischen Nockenwellenverstellers wird es möglich, das vom Steuerventil kommende und in den Tank abzuführende Öl so zu führen, dass sehr viel weniger Öl in den Kontaktbereich zwischen dem Ankerstößel des Zentralmagneten und dem Ventilkolben gelangt. Dadurch ist der Verschließ an dieser empfindlichen Kontaktstelle wesentlich herabgesetzt, da weniger Abrasivpartikel im Öl an dieselbe gefördert werden. Eine direkte Beaufschlagung der Kontaktstelle mit abfließendem Hydrauliköl ist also verhindert.With the proposed embodiment of a control valve of a hydraulic camshaft adjuster, it is possible to guide the coming of the control valve and discharged into the tank oil so that much less oil enters the contact area between the armature plunger of the central magnet and the valve piston. As a result, the closure is significantly reduced at this sensitive contact point, since less abrasive particles are promoted in the oil to the same. A direct action on the contact point with draining hydraulic oil is thus prevented.

Weiterhin ist es mit dem Erfindungsvorschlag möglich, mit dem Öl, das zum Tank geleitet wird, den Zentralmagneten zu kühlen. Das Öl kann insbesondere durch die Ölabflussbohrungen auf die Oberfläche des Zentralmagneten gelenkt werden, was für eine entsprechende Kühlung des Zentralmagneten sorgt.Furthermore, it is possible with the invention proposal to cool the central magnet with the oil which is passed to the tank. The oil can be directed in particular through the oil drain holes on the surface of the central magnet, which ensures a corresponding cooling of the central magnet.

Darüber hinaus ist es durch die schrägen oder radialen Ölabflussbohrungen möglich, das vom Nockenwellenversteller kommende Öl gezielt auf die Oberfläche eines das Nockenwellenverstellsystem umschließenden Gehäuses und/oder auf die Oberfläche eines benachbarten Bauteils zu fördern und an dieser Oberfläche abzukühlen, sofern diese kühler ist als das Öl.In addition, it is possible by the oblique or radial Ölabflussbohrungen targeted from the camshaft adjuster oil on the surface of the camshaft adjusting enclosing housing and / or on the surface of an adjacent component to cool and cool on this surface, provided that it is cooler than the oil ,

Von Vorteil ist es weiterhin, dass eine verbesserte Abfuhr des Öls aus dem Zentralventil gegeben ist, da das Öl infolge der Zentrifugalkräfte durch die Abfluss-Fluidleitung (Abflussbohrungen) im Steuerventil verbessert heraus gefördert wird. Das Öl kann also beschleunigt aus dem Zentralventil abgeführt werden. Durch die sich im Betrieb der Brennkraftmaschine drehende Nockenwelle und die radialen bzw. schrägen Ölabflussbohrungen stellen die entstehenden Fliehkräfte also sicher, dass das Öl schneller als im Stand der Technik aus dem Steuerventil abgeführt wird.It is also advantageous that there is an improved drainage of the oil from the central valve, since the oil is due to the centrifugal forces through the outflow fluid line (drain holes) in the control valve improved promoted out. The oil can therefore be accelerated discharged from the central valve. As a result of the camshaft rotating during operation of the internal combustion engine and the radial or oblique oil drain holes, the centrifugal forces created ensure that the oil is removed from the control valve faster than in the prior art.

Kurze Beschreibung der FigurenBrief description of the figures

In den Zeichnungen sind Ausführungsbeispiele der Erfindung dargestellt. Es zeigen:

Fig. 1
den Radialschnitt durch einen Teil einer Brennkraftmaschine mit einer Vorrichtung zur Veränderung der relativen Winkellage einer Nockenwelle gegenüber einer Kurbelwelle der Brennkraftmaschine, also einem Nockenwellenversteller,
Fig. 2
den Radialschnitt des Steuerventils des Nockenwellenversteller gemäß einer ersten Ausführungsform der Erfindung,
Fig. 3
Das Steuerventil gemäß Fig. 2 in perspektivischer Darstellung und
Fig. 4
den Radialschnitt des Steuerventils des Nockenwellenversteller gemäß einer zweiten Ausführungsform der Erfindung.
In the drawings, embodiments of the invention are shown. Show it:
Fig. 1
the radial section through a part of an internal combustion engine with a device for changing the relative angular position of a camshaft relative to a crankshaft of the internal combustion engine, ie a phaser,
Fig. 2
FIG. 2 the radial section of the control valve of the camshaft adjuster according to a first embodiment of the invention, FIG.
Fig. 3
The control valve according to Fig. 2 in perspective and
Fig. 4
the radial section of the control valve of the camshaft adjuster according to a second embodiment of the invention.

Ausführliche Beschreibung der FigurenDetailed description of the figures

In Fig. 1 ist ein Teil einer Brennkraftmaschine skizziert, wobei ein Zylinderkopf 21 angedeutet ist, in dem eine Nockenwelle 3 gelagert ist. Der Antrieb der Nockenwelle 3 erfolgt über ein Antriebselement 9 eines Nockenwellenverstellers 2, wobei das Antriebselement 9 in (nicht dargestellter) Drehverbindung mit der (ebenfalls nicht dargestellten) Kurbelwelle des Motors steht. Im Nockenwellenversteller 2 befindet sich eine hydraulische Verstelleinrichtung, die zwischen dem Antriebselement 9 und der Nockenwelle 3 eine Winkelverdrehung bewerkstelligen kann, um in bekannter Weise die Steuerzeiten der Brennkraftmaschine zu beeinflussen. Hierzu sind paarweise (nicht näher zu erkennende) Hydraulikkammern zwischen dem Antriebselement 9 und der Nockenwelle 3 wirksam angeordnet, die mit Druckfluid beaufschlagt werden können, um die genannte Verdrehung einstellen zu können. Von diesen Paaren von Hydraulikkammern sind über den Umfang mehrere vorhanden. Der Nockenwellenversteller 2 dient also zur Veränderung der relativen Winkellage der Nockenwelle 3 gegenüber der Kurbelwelle der Brennkraftmaschine.In Fig. 1 is a part of an internal combustion engine sketched, wherein a cylinder head 21 is indicated, in which a camshaft 3 is mounted. The drive of the camshaft 3 via a drive element 9 of a camshaft adjuster 2, wherein the drive element 9 is in (not shown) rotary connection with the (also not shown) crankshaft of the engine. In the camshaft adjuster 2 there is a hydraulic adjusting device which can accomplish an angular rotation between the drive element 9 and the camshaft 3 to influence the timing of the internal combustion engine in a known manner. For this purpose, paired (not closer to be recognized) hydraulic chambers between the drive element 9 and the camshaft 3 are effectively arranged, which can be acted upon by pressurized fluid to adjust the said rotation can. Several of these pairs of hydraulic chambers are present over the circumference. The camshaft adjuster 2 thus serves to change the relative angular position of the camshaft 3 relative to the crankshaft of the internal combustion engine.

Die Steuerung von Hydrauliköl in die Hydraulikkammern erfolgt durch ein Steuerventil 1, das - als Zentralventil ausgebildet - in einem axialen Endbereich einen Gewindeabschnitt 19 aufweist, der in eine Gewindebohrung 20 in der Nockenwelle 3 eingeschraubt ist.The control of hydraulic oil in the hydraulic chambers is effected by a control valve 1, which - formed as a central valve - in an axial end portion has a threaded portion 19 which is screwed into a threaded bore 20 in the camshaft 3.

Die Betätigung des Steuerventils 1 erfolgt durch axiale Beaufschlagung eines im Steuerventil 1 angeordneten Steuerkolbens 14, der von einem Elektromagneten 16 und insbesondere von dessen Ankerstößel 15 in Achsrichtung A beaufschlagt wird.The actuation of the control valve 1 is effected by axial loading of a control piston 1 arranged in the control piston 14, which is acted upon by an electromagnet 16 and in particular of its armature plunger 15 in the axial direction A.

Details zum Aufbau und zur Wirkungsweise des Nockenwellenverstellers 2 und insbesondere des Steuerventils 1 sind in der genannten DE 10 2008 004 591 A1 der Anmelderin beschrieben, auf die insoweit ausdrücklich Bezug genommen wird. Die meisten Ausführungen in diesem Dokument gelten auch hier, wobei grundsätzlich derselbe Aufbau und dieselbe Wirkungsweise des Steuerventils gegeben sind.Details of the structure and operation of the camshaft adjuster 2 and in particular of the control valve 1 are in the mentioned DE 10 2008 004 591 A1 the applicant, to which express reference is made. Most of the explanations in this document also apply here, with basically the same structure and the same operation of the control valve are given.

Für die vorliegende Erfindung sind indes folgende Aspekte wesentlich:For the present invention, however, the following aspects are essential:

Das Steuerventil 1 hat in einem der Nockenwelle 3 zugewandten Bereich 4 (s. hierzu Fig. 2) eine Fluidleitung 5 zur Zuführung von unter Druck stehendem Fluid von einem Hochdruckraum 22 aus. Die Fluidleitung 5 umfasst vorliegend mehrere in radialer Richtung r verlaufende Bohrungen, die es ermöglichen, dass Hydrauliköl in das Innere des Steuerventils 1 eintritt. In einem axialen Mittenbereich 6 (s. Fig. 2) hat das Steuerventil 1 zwei Fluidleitungen 7 und 8 zur Zu- und Abführung von unter Druck stehendem Hydrauliköl in die Hydraulikkammern des Nockenwellenverstellers 2. In einem von der Nockenwelle 3 abgewandten Bereich 10 (s. Fig. 2) weist das Steuerventil 1 eine Fluidleitung 11 zur Abfuhr von Fluid zu einem Tank auf.The control valve 1 has in a region 4 facing the camshaft 3 (see this Fig. 2 ) a fluid line 5 for supplying pressurized fluid from a high-pressure chamber 22 from. In the present case, the fluid line 5 comprises a plurality of bores extending in the radial direction r, which enable hydraulic oil to enter the interior of the control valve 1. In an axial center region 6 (see FIG. Fig. 2 ), the control valve 1 has two fluid lines 7 and 8 for supply and discharge of pressurized hydraulic oil in the hydraulic chambers of the camshaft adjuster 2. In a side facing away from the camshaft 3 region 10 (s. Fig. 2 ), the control valve 1 on a fluid line 11 for the removal of fluid to a tank.

In Fig. 2 ist durch Pfeile angedeutet, wie Öl vom Hochdruckraum 22 ("Zu") in das Steuerventil 1 fließt. Von diesem wird den Kammern ("K") Öl zugeleitet bzw. von diesen abgeleitet. Anschließend fließt das Öl in den Tank ("Ab").In Fig. 2 is indicated by arrows as oil flows from the high-pressure chamber 22 ("closed") into the control valve 1. From this, the chambers ("K") oil is supplied or derived from these. Then the oil flows into the tank ("down").

Ausgehend von einer insoweit auch in der DE 10 2008 004 591 A1 beschriebenen Ausgestaltung des Steuerventils 1 ist erfindungsgemäß vorgesehen, dass die Fluidleitung 11 zur Abfuhr von Fluid zum Tank in einem vorzugsweise hohlzylindrischen Abschnitt 12 des Steuerventils 1 vorgesehen ist, wobei diese Fluidleitung als mindestens eine sich durch den vorzugsweise hohlzylindrischen Abschnitt 12 zur Außenseite 13 des Abschnitts 12 erstreckende Ausnehmung 11 ausgebildet ist. Bevorzugt handelt es sich bei der Ausnehmung um eine Bohrung.Starting from a so far in the DE 10 2008 004 591 A1 described embodiment of the control valve 1 is provided according to the invention that the fluid line 11 is provided for the removal of fluid to the tank in a preferably hollow cylindrical portion 12 of the control valve 1 is, wherein said fluid conduit is formed as at least one extending through the preferably hollow cylindrical portion 12 to the outer side 13 of the portion 12 recess 11. Preferably, the recess is a bore.

Demgemäß fließt das Hydrauliköl bei dem vorgeschlagenen Steuerventil 1 nicht in Achsrichtung aus dem Steuerventil 1 und in Richtung des Kontakts des Ankerstößels 15 mit dem Steuerkolben 14 aus, sondern es wird radial nach außen aus dem Steuerventil 1 abgeleitet. Wie in den Figuren 1 bis 3 gesehen werden kann, sind die Abfluss-Fluidleitungen, d. h. die Bohrungen 11, so eingearbeitet, dass ihre Längsachse 17 unter einem Winkel □ zur Achsrichtung A angeordnet ist, der im Ausführungsbeispiel ca. 45° beträgt.Accordingly, in the proposed control valve 1, the hydraulic oil does not flow out of the control valve 1 in the axial direction and toward the contact of the armature plunger 15 with the control piston 14, but it is discharged radially outward from the control valve 1. As in the FIGS. 1 to 3 can be seen, the outflow fluid lines, ie, the holes 11, incorporated so that its longitudinal axis 17 is disposed at an angle □ to the axial direction A, which is approximately 45 ° in the embodiment.

Zu erkennen ist im Ausführungsbeispiel gemäß Fig. 1 bis 3 und insbesondere in Fig. 3 auch, dass der Abschnitt 12 nicht als idealer hohlzylindrischer Abschnitt ausgebildet ist, sondern dass der hohlzylindrische Abschnitt an der Außenseite eine Sechskantform aufweist, wobei in jede der sechs Außenseiten 13 des Sechskants je eine Bohrung 11 eingearbeitet ist, die sich unter dem Winkel □ nach außen erstreckt.It can be seen in the embodiment according to Fig. 1 to 3 and in particular in Fig. 3 Also, that the portion 12 is not formed as an ideal hollow cylindrical portion, but that the hollow cylindrical portion has a hexagonal shape on the outside, wherein in each of the six outer sides 13 of the hexagon ever a bore 11 is incorporated, extending at an angle □ to the outside extends.

Wie in Fig. 1 gesehen werden kann, kann damit der Strom des abfließenden Öls auf die Stirnseite 18 des Zentralmagneten 16 geleitet werden, der auf diese Weise gekühlt wird.As in Fig. 1 can be seen, so that the flow of the effluent oil can be directed to the end face 18 of the central magnet 16, which is cooled in this way.

Die Lösung gemäß Fig. 4 entspricht weitgehend derjenigen gemäß Fig. 2, wobei lediglich die Ölabflussbohrungen, d. h. die Ausnehmungen 11, hier in radiale Richtung r verlaufen, nicht unter einem Winkel □.The solution according to Fig. 4 corresponds largely to that according to Fig. 2 , wherein only the oil drain holes, ie the recesses 11, here in the radial direction r, not at an angle □.

Im axialen Endbereich (Kopfbereich) des Steuerventils 1 bzw. an nicht durch den Rotor oder andere Bauteile verdeckten Abschnitten des Steuerventils befindet sich also erfindungsgemäß mindestens eine radiale oder unter Winkel verlaufende schräge Olabflussbohrung, über die das vom Nockenwellenversteller kommende Öl in Richtung Tank abgeführt wird.In the axial end region (head region) of the control valve 1 or not covered by the rotor or other components sections of the control valve is therefore according to the invention at least one radial or at an angle oblique Olabflussbohrung over which the camshaft adjuster coming oil is discharged in the direction of the tank.

Vorteilhafter Weise werden die Ölabflussbohrungen so gefertigt, dass das Steuerventilgehäuse von außen angebohrt wird.Advantageously, the oil drain holes are made so that the control valve housing is drilled from the outside.

Die Bohrungen sind bevorzugt so gestaltet bzw. ausgerichtet, dass sie auf die Oberfläche des Zentralmagneten treffen. Die Bohrungen können auch so gestaltet bzw. ausgerichtet sein, dass sie auf die Oberfläche eines das Nockenwellenverstellsystem abdeckenden Gehäuses oder auf ein anderes Bauteil treffen.The bores are preferably designed or aligned such that they strike the surface of the central magnet. The bores can also be designed or aligned so that they strike the surface of a housing covering the camshaft adjusting system or another component.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Steuerventilcontrol valve
22
Vorrichtung (Nockenwellenversteller)Device (Camshaft adjuster)
33
Nockenwellecamshaft
44
zugewandter Bereichfacing area
55
Fluidleitungfluid line
66
Mittenbereichmid-range
77
Fluidleitungfluid line
88th
Fluidleitungfluid line
99
Antriebselementdriving element
1010
abgewandter Bereichremote area
1111
Fluidleitungfluid line
1212
hohlzylindrischer Abschnitthollow cylindrical section
1313
Außenseiteoutside
1414
Steuerkolbenspool
1515
Ankerstößelarmature plunger
1616
Aktuator (Elektromagnet)Actuator (electromagnet)
1717
Längsachselongitudinal axis
1818
Stirnflächeface
1919
Gewindeabschnittthreaded portion
2020
Gewindebohrungthreaded hole
2121
Zylinderkopfcylinder head
2222
HochdruckraumHigh-pressure chamber
□□
Winkelangle
rr
radiale Richtungradial direction
AA
Achsrichtungaxially
ZuTo
Zuflussinflow
AbFrom
Abfluss zum TankDrain to the tank
KK
Hydraulikölfluss zu und von den HydraulikkammernHydraulic oil flow to and from the hydraulic chambers

Claims (6)

  1. Control valve (1) of a device (2) for changing the angular position of a camshaft (3) in relation to a crankshaft of an internal combustion engine, wherein, in a region (4) facing the camshaft (3), the control valve (1) has a fluid line (5) for supplying pressurized fluid, wherein, in an axial centre region (6), the control valve (1) has two fluid lines (7, 8) for feeding pressurized fluid to and removing same from at least two hydraulic chambers, wherein the hydraulic chambers are actively arranged between a drive element (9) and the camshaft (3) in order to set a defined relative rotational position between the drive element (9) and the camshaft (3), and wherein, in a region (10) facing away from the camshaft (3), the control valve (1) has a fluid line (11) for removing fluid to a tank, wherein the fluid line (11) for removing fluid is formed in a preferably hollow-cylindrical section (12) of the control valve (1) as at least one recess extending through the preferably hollow-cylindrical section (12) to the outer side (13) of the section (12), and wherein a control piston (14) is arranged in the preferably hollow-cylindrical section (12) of the control valve (1), said control piston being contacted at the end thereof facing away from the camshaft (3) by an armature push rod (15) of an actuator (16), characterized in that the at least one recess (11) is oriented radially and runs at an angle (alpha α) of between 30° and 60° to the axial direction (A) in such a manner that fluid is thereby guided onto the end surface (18) of the actuator (16).
  2. Control valve according to Claim 1, characterized in that the fluid line (11) is formed by a plurality of recesses, in particular bores, which are distributed around the circumference of the preferably hollow-cylindrical section (12).
  3. Control valve according to Claim 1 or 2, characterized in that a longitudinal axis (17) of the recess (11), in particular of the bore, impinges on an end surface (18) of the actuator (16).
  4. Control valve according to one of the preceding claims, characterized in that the fluid line (11) for removing fluid is in the form of at least one bore.
  5. Control valve according to one of the preceding claims, characterized in that the actuator (16) is in the form of a solenoid.
  6. Control valve according to Claim 1, characterized in that said control valve is in the form of a central screw and is arranged with a threaded section (19) in a threaded bore (20) in the camshaft (2).
EP11704574.0A 2010-03-24 2011-02-08 Control valve of a phasing device for adjusting the phase of a camshaft relative to the crankshaft in an internal combustion engine Not-in-force EP2550437B1 (en)

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DE201010012479 DE102010012479A1 (en) 2010-03-24 2010-03-24 Control valve of a device for changing the relative angular position of a camshaft relative to a crankshaft of an internal combustion engine
PCT/EP2011/051806 WO2011117019A1 (en) 2010-03-24 2011-02-08 Control valve of a device for changing the relative angular position of a camshaft with respect to a crankshaft of an internal combustion engine

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EP2550437B1 true EP2550437B1 (en) 2016-04-20

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EP2550437A1 (en) 2013-01-30
US8733306B2 (en) 2014-05-27
CN102822456A (en) 2012-12-12
US20120325169A1 (en) 2012-12-27
WO2011117019A1 (en) 2011-09-29
DE102010012479A1 (en) 2011-09-29

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