EP2564040B1 - Pressure accumulator arrangement for a camshaft adjusting system - Google Patents

Pressure accumulator arrangement for a camshaft adjusting system Download PDF

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Publication number
EP2564040B1
EP2564040B1 EP11714014.5A EP11714014A EP2564040B1 EP 2564040 B1 EP2564040 B1 EP 2564040B1 EP 11714014 A EP11714014 A EP 11714014A EP 2564040 B1 EP2564040 B1 EP 2564040B1
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EP
European Patent Office
Prior art keywords
camshaft
pressure accumulator
housing
control valve
pressure
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.)
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EP11714014.5A
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German (de)
French (fr)
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EP2564040A1 (en
Inventor
Michael Busse
Mathias Boegershausen
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Schaeffler Technologies AG and Co KG
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Schaeffler Technologies AG and Co KG
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Publication of EP2564040A1 publication Critical patent/EP2564040A1/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
    • 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
    • F01L2001/34446—Fluid accumulators for the feeding circuit

Definitions

  • the invention relates to a pressure accumulator arrangement of a camshaft for a camshaft adjusting system of an internal combustion engine having at least one pressure accumulator and at least one control valve.
  • camshaft adjustment systems are used for the variable adjustment of the timing of gas exchange valves, in order to be able to make the phase relation between crankshaft and camshaft variable within a defined angular range.
  • hydraulic camshaft adjustment systems require energy for the adjustment process which is made available to them via a pressure medium system.
  • the energy available in the pressure medium system is formed from the product of pressure medium pressure and pressure medium volume flow.
  • the required pressure medium flow flowing in the camshaft adjuster In an adjustment of one or more camshafts of the internal combustion engine is branched off by means of at least one control valve which is connected upstream of the camshaft adjuster, the required pressure medium flow flowing in the camshaft adjuster.
  • an accumulator may be provided which provides pressure energy to the camshaft adjusting system in the event of a fall in the fluid pressure to compensate.
  • a communicating with a camshaft adjuster volume memory is in one under the file number DE 10 2009 049 459 published patent application.
  • the volume accumulator is formed in a cavity of a camshaft and is connected via a arranged in the camshaft pressure medium passage with a control valve, which serves to supply the camshaft adjuster with pressure medium in combination.
  • control valve and volume memory are designed separately. As a result, these components must be mounted individually on each side of the camshaft and connected to each other by a pressure medium channel in the camshaft.
  • additional fittings or deflections throttle losses occur, whereby the function of the pressure accumulator is impaired.
  • the WO2008 / 140897 A1 shows a camshaft with a piston mounted therein, which is axially displaceable and together with the camshaft forms a pressure accumulator. End of the camshaft, a control valve is inserted.
  • the invention is therefore an object of the invention to simplify an accumulator assembly of the aforementioned type in terms of their structure and to make cost-effective.
  • the object is solved by the features of claim 1.
  • an accumulator assembly in which the pressure accumulator and the control valve are connected to form a structural unit.
  • the accumulator assembly is easy to manufacture and easily mounted in the camshaft on one side.
  • Such a unit also improves the function of the pressure accumulator, in particular can by the direct connection of the accumulator to the control valve throttling losses between this and the accumulator can be avoided.
  • An assembly of pressure accumulator and control valve for arrangement in the camshaft can be achieved according to the invention in a particularly simple manner, when pressure accumulator and control valve are plugged into each other at end portions of their housing and form a press fit. Also conceivable are other non-positive and / or positive and / or cohesive connections of the housing.
  • control valve and pressure accumulator are designed at their nested housing end portions with retracted diameter.
  • a radial annular gap with respect to the inner wall of the camshaft.
  • the pressure medium supply of the assembly can take place directly on the housing end sections.
  • a plurality of radially aligned openings are preferably provided for this purpose at the housing end sections in the region of the annular gap, which communicate via the annular gap with a pressure medium inlet connection to the camshaft.
  • the housing end portion of the control valve is axially inserted into the end portion of the housing of the pressure accumulator and designed extended so that it also forms an end stop for a piston axially displaceable in this at its front end in the housing of the pressure accumulator.
  • FIG. 1 shows an embodiment of an accumulator assembly according to the invention for an unillustrated hydraulic camshaft adjusting an internal combustion engine.
  • the accumulator assembly is arranged in a camshaft of the internal combustion engine and consists of a pressure accumulator and a control valve, which are formed as a structural unit.
  • the camshaft is axially open on both sides, for example, designed as a hollow shaft.
  • the camshaft for receiving the assembly on a cylindrical cavity, which is designed in two sections with different diameters in each case as an axial central bore.
  • the control valve designed as a central valve is arranged in a first section of the cavity.
  • the control valve is upstream of the camshaft adjusting system and consists of a central valve assembly 6, which has a substantially cylindrical housing.
  • the first section of the cavity is adjoined by an annular step 7 with a second section, which is of slightly reduced diameter, in which the pressure accumulator, which consists of a pressure accumulator subassembly 8, is arranged.
  • the piston 5 separates in the interior of the housing a control valve axially facing and about this with the Nockenwellenverstellsystem in fluid communication pressure chamber of a pressure-free complementary space in which the compression spring 9 is received.
  • the piston 5 is pot-shaped, arranged axially displaceable in the housing and is guided on the inner wall thereof. Both the housing and the piston 5 are executable in sheet metal and without cutting, in particular by deep drawing, produced.
  • the control valve and pressure accumulator are arranged coaxially in the camshaft and connected to their housings to form a structural unit.
  • the mutually axially facing hollow cylindrical end portions 1, 2 of their housing are inserted into one another and form a press fit.
  • other non-positive and / or positive and / or material connections such. Screw connections, adhesive connections or connections by crimping.
  • the control valve and pressure accumulator form a pressure accumulator central valve assembly, which can be easily inserted as a component for mounting on the camshaft adjustment system facing the open end of the camshaft into the cavity.
  • the piston 5 In the housing of the pressure accumulator, the piston 5 is acted upon at its pressure chamber facing the closed axial side via the end portion 2 with pressure medium and is at the same time facing away from the pressure chamber axial side with the executed as a helical compression spring compression spring 9 in operative connection.
  • a helical compression spring compression spring 9 in operative connection.
  • the pressure medium leakage on the piston 5 in the housing of the accumulator can be removed at the averted from the camshaft adjusting open end of the camshaft via a drain connection to a pressure medium reservoir, such as the engine oil tank of the internal combustion engine, and at the same time the housing on the spring side and vented.
  • a pressure medium reservoir such as the engine oil tank of the internal combustion engine
  • the helical compression spring is arranged coaxially in the housing of the pressure accumulator and engages with its the piston 5 facing the spring end in the spring-side open end. The spring end portion rests against the closed axial side of the piston 5 inside. At the spring end section facing away from the piston 5, the helical compression spring is axially supported on a spring support 10 integrated in the housing. The helical compression spring is guided during a movement of the piston 5 on the inner wall of the housing and on the inner wall of the piston 5. To limit the movement of the piston 5 in the tensioned state of the helical compression spring an integrated into the housing axial stop 11 is provided. FIG. 1 shows the piston 5 in the position on the stop 11 with tensioned helical compression spring.
  • FIG. 2 is the accumulator assembly in an enlarged section (detail Z out FIG. 1 ) is shown on the camshaft adjusting system facing end portion of the camshaft.
  • the central valve assembly 6 is received in the first section of the cavity.
  • This comprises the housing, an intermediate sleeve and a control piston accommodated therein and a plate check valve 12 integrated into the control valve.
  • the working valve A, B communicates with the camshaft adjusting system via working ports A, B.
  • the axially movable in the housing arranged control piston is controlled via a dashed lines schematically indicated central magnet.
  • a drain port T is formed, via which Pressure fluid from the camshaft adjusting system can flow into a non-illustrated pressure medium reservoir.
  • the plate check valve 12 is used to prevent a backflow in the direction of the pressure medium inlet port P and is integrated into the pressure accumulator end facing the control valve in a separately executed housing part. This is formed on the outside of the housing of the control valve in an annular radial groove form-fitting attachable and running on its side facing the pressure accumulator by the remote with retracted diameter hollow cylindrical end portion 1 axially extended. For connection to the control valve of this facing hollow cylindrical end portion 2 of the housing of the pressure accumulator is retracted in diameter and pressed axially in a press fit on the end portion 1.
  • the end portion 1 is designed so axially extended that it forms an end stop for the piston 5 at its front end in the housing of the pressure accumulator, approximately at the level of the paragraph formed by the retracted end portion 2 paragraph on the housing in the relaxed state of the helical compression spring.
  • a radial annular gap is formed in the cavity of the camshaft relative to the inner wall of the camshaft.
  • a pressure fluid system not shown, for example, the engine oil circuit of the internal combustion engine with a pressure medium pump.
  • the pressure medium inlet port P has a plurality of distributed over the circumference radial through holes on the camshaft.
  • the retracted with retracted diameter end portion 1 forms on the housing of the control valve an annular shoulder 13 which rests in the mounted state on the annular step 7 on the inner wall of the camshaft in the cavity.
  • the control valve and the pressure accumulator can be inserted as a construction and mounting unit on the camshaft adjustment system facing open end of the camshaft until the annular shoulder 13 abuts the ring stage 7. As a result, the assembly is axially secured in the assembled state at the ring stage 7 accumulator side in the camshaft.
  • Valve side the axial position assurance of the assembly takes place by means of a locking ring 14 which is arranged in an annular groove on the inner wall in the first cavity of the camshaft on the axially remote from the pressure accumulator side of the housing.
  • the housing is located on the locking ring 14 frontally axially.
  • the housing of the control valve and the inner wall of the camshaft form a cylindrical clearance fit.
  • the control valve and pressure accumulator can be centered as a unit in the camshaft on the housing of the control valve.
  • the housing of the pressure accumulator is arranged in the second portion of the cavity with a radial annular gap to the inner wall of the camshaft.
  • manufacturing tolerances on the outer diameter of the housing of the pressure accumulator can be compensated or the requirements for the manufacturing tolerances of the second portion of the cavity in the camshaft, be set lower.
  • a slight expansion of the housing may be provided on the end region of the housing facing away from the control valve.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)

Description

Gebiet der ErfindungField of the invention

Die Erfindung betrifft eine Druckspeicheranordnung einer Nockenwelle für ein Nockenwellenverstellsystem einer Brennkraftmaschine mit zumindest einem Druckspeicher und zumindest einem Steuerventil.The invention relates to a pressure accumulator arrangement of a camshaft for a camshaft adjusting system of an internal combustion engine having at least one pressure accumulator and at least one control valve.

In modernen Brennkraftmaschinen werden Nockenwellenverstellsysteme zur variablen Einstellung der Steuerzeiten von Gaswechselventilen eingesetzt, um die Phasenrelation zwischen Kurbelwelle und Nockenwelle in einem definierten Winkelbereich variabel gestalten zu können. Üblicherweise benötigen hydraulische Nockenwellenverstellsysteme für den Verstellvorgang Energie, die ihnen über ein Druckmittelsystem zur Verfügung gestellt wird. Dabei wird die im Druckmittelsystem zur Verfügung stehende Energie aus dem Produkt aus Druckmitteldruck und Druckmittelvolumenstrom gebildet. Bei einer Verstellung einer oder mehrerer Nockenwellen der Brennkraftmaschine wird mittels zumindest eines Steuerventils, das dem Nockenwellenversteller vorgeschaltet ist, der erforderliche Druckmittelstrom abgezweigt, der in den Nockenwellenversteller strömt. Zugleich gelangt aus dem Nockenwellenversteller ein gleichgroßer Druckmittelstrom zurück in das Druckmittelreservoir des Druckmittelsystems und wird damit dem Druckmittelsystem wieder zugeführt wird. Durch Entnahme des Druckmittelstroms aus dem Druckmittelsystem sinkt als Folge der Druckmitteldruck. Dadurch reduziert sich auch die Energie, die für die Verstellung dem Nockenwellenversteller zur Verfügung steht. Um dies zu verhindern, kann ein Druckspeicher vorgesehen sein, der dem Nockenwellenverstellsystem im Falle eines Absinkens des Druckmitteldrucks zum Ausgleich Druckenergie zur Verfügung stellt.In modern internal combustion engines, camshaft adjustment systems are used for the variable adjustment of the timing of gas exchange valves, in order to be able to make the phase relation between crankshaft and camshaft variable within a defined angular range. Usually, hydraulic camshaft adjustment systems require energy for the adjustment process which is made available to them via a pressure medium system. In this case, the energy available in the pressure medium system is formed from the product of pressure medium pressure and pressure medium volume flow. In an adjustment of one or more camshafts of the internal combustion engine is branched off by means of at least one control valve which is connected upstream of the camshaft adjuster, the required pressure medium flow flowing in the camshaft adjuster. At the same time passes from the camshaft adjuster an equal pressure medium flow back into the pressure fluid reservoir of the pressure fluid system and is thus fed back to the pressure fluid system. By removing the pressure medium flow from the pressure medium system decreases as a result of the pressure medium pressure. This also reduces the energy that is available for the adjustment of the camshaft adjuster. To prevent this, an accumulator may be provided which provides pressure energy to the camshaft adjusting system in the event of a fall in the fluid pressure to compensate.

Ein mit einem Nockenwellenversteller kommunizierender Volumenspeicher ist in einer unter dem Aktenzeichen DE 10 2009 049 459 veröffentlichten Patentanmeldung beschrieben. Der Volumenspeicher ist in einem Hohlraum einer Nockenwelle ausgebildet und steht über einen in der Nockenwelle angeordneten Druckmittelkanal mit einem Steuerventil, das zur Versorgung des Nockenwellenverstellers mit Druckmittel dient, in Verbindung. Nachteilig wirkt sich bei dieser Ausgestaltung der Umstand aus, dass Steuerventil und Volumenspeicher separat ausgebildet sind. Dadurch müssen diese Bauteile einzeln jeweils an einer Seite der Nockenwelle montiert und durch einen Druckmittelkanal in der Nockenwelle miteinander verbunden werden. Zudem können im Druckmittelkanal, insbesondere durch Querschnittsverengungen, zusätzliche Einbauten oder Umlenkungen Drosselverluste auftreten, wodurch die Funktion des Druckspeichers beeinträchtigt wird.A communicating with a camshaft adjuster volume memory is in one under the file number DE 10 2009 049 459 published patent application. The volume accumulator is formed in a cavity of a camshaft and is connected via a arranged in the camshaft pressure medium passage with a control valve, which serves to supply the camshaft adjuster with pressure medium in combination. A disadvantage of this embodiment, the fact that control valve and volume memory are designed separately. As a result, these components must be mounted individually on each side of the camshaft and connected to each other by a pressure medium channel in the camshaft. In addition, in the pressure medium channel, in particular by cross-sectional constrictions, additional fittings or deflections throttle losses occur, whereby the function of the pressure accumulator is impaired.

Die WO2008/140897 A1 zeigt eine Nockenwelle mit einem darin montierten Kolben, der axialverschiebbar ist und mit der Nockenwelle gemeinsam einen Druckspeicher ausbildet. Endseitig an der Nockenwelle ist ein Steuerventil eingesteckt.The WO2008 / 140897 A1 shows a camshaft with a piston mounted therein, which is axially displaceable and together with the camshaft forms a pressure accumulator. End of the camshaft, a control valve is inserted.

Zusammenfassung der ErfindungSummary of the invention

Der Erfindung liegt daher die Aufgabe zugrunde, eine Druckspeicheranordnung der vorgenannten Art hinsichtlich ihres Aufbaues zu vereinfachen und kostengünstig zu gestalten. Die Aufgabe wird durch die Merkmale des Anspruchs 1 gelöst.The invention is therefore an object of the invention to simplify an accumulator assembly of the aforementioned type in terms of their structure and to make cost-effective. The object is solved by the features of claim 1.

Es wird eine Druckspeicheranordnung vorgeschlagen, bei der der Druckspeicher und das Steuerventil zu einer Baueinheit verbunden sind. Als eine Baueinheit ist die Druckspeicheranordnung einfach herstellbar und auf einfache Weise in der Nockenwelle an einer Seite montierbar. Eine solche Baueinheit verbessert zugleich die Funktion des Druckspeichers, insbesondere können durch die unmittelbare Anbindung des Druckspeichers an das Steuerventil Drosselverluste zwischen diesem und dem Druckspeicher vermieden werden.It is proposed an accumulator assembly in which the pressure accumulator and the control valve are connected to form a structural unit. As an assembly, the accumulator assembly is easy to manufacture and easily mounted in the camshaft on one side. Such a unit also improves the function of the pressure accumulator, in particular can by the direct connection of the accumulator to the control valve throttling losses between this and the accumulator can be avoided.

Eine Baueinheit aus Druckspeicher und Steuerventil zur Anordnung in der Nockenwelle lässt sich erfindungsgemäß auf besonders einfache Weise erreichen, wenn Druckspeicher und Steuerventil an Endabschnitten ihrer Gehäuse ineinandergesteckt sind und einen Pressverband bilden. Denkbar sind auch andere kraftschlüssige und/oder formschlüssige und/oder stoffschlüssige Verbindungen der Gehäuse.An assembly of pressure accumulator and control valve for arrangement in the camshaft can be achieved according to the invention in a particularly simple manner, when pressure accumulator and control valve are plugged into each other at end portions of their housing and form a press fit. Also conceivable are other non-positive and / or positive and / or cohesive connections of the housing.

Es ist vorteilhaft, wenn Steuerventil und Druckspeicher an ihren ineinandergesteckten Gehäuseendabschnitten mit eingezogenem Durchmesser ausgeführt sind. Auf diese Weise entsteht im montierten Zustand der Baueinheit in einem Hohlraum der Nockenwelle ein radialer Ringspalt gegenüber der Innenwand der Nockenwelle. Dabei kann die Druckmittelversorgung der Baueinheit unmittelbar an den Gehäuseendabschnitten erfolgen. Bevorzugt sind hierzu an den Gehäuseendabschnitten im Bereich des Ringspalts mehrere radial fluchtende Öffnungen vorgesehen, die über den Ringspalt mit einem Druckmittelzulaufanschluss an der Nockenwelle kommunizieren.It is advantageous if control valve and pressure accumulator are designed at their nested housing end portions with retracted diameter. In this way, in the mounted state of the assembly in a cavity of the camshaft, a radial annular gap with respect to the inner wall of the camshaft. In this case, the pressure medium supply of the assembly can take place directly on the housing end sections. For this purpose, a plurality of radially aligned openings are preferably provided for this purpose at the housing end sections in the region of the annular gap, which communicate via the annular gap with a pressure medium inlet connection to the camshaft.

Vorzugsweise ist der Gehäuseendabschnitt des Steuerventils in den Endabschnitt des Gehäuses des Druckspeichers axial eingesteckt und derart verlängert ausgeführt, dass dieser zugleich an seinem stirnseitigen Ende im Gehäuse des Druckspeichers einen Endanschlag für einen in diesem axial verschiebbaren Kolben bildet.Preferably, the housing end portion of the control valve is axially inserted into the end portion of the housing of the pressure accumulator and designed extended so that it also forms an end stop for a piston axially displaceable in this at its front end in the housing of the pressure accumulator.

Kurze Beschreibung der ZeichnungenBrief description of the drawings

Weitere Merkmale der Erfindung ergeben sich aus der nachfolgenden Beschreibung und aus den Zeichnungen, in denen ein Ausführungsbeispiel der Erfindung vereinfacht dargestellt ist. Es zeigen:

Figur 1
einen Längsschnitt einer erfindungsgemäßen Druckspeicheranordnung in einer Nockenwelle,
Figur 2
eine vergrößerte Darstellung der Einzelheit Z aus Figur 1.
Further features of the invention will become apparent from the following description and from the drawings, in which an embodiment of the invention is shown in simplified form. Show it:
FIG. 1
a longitudinal section of an accumulator assembly according to the invention in a camshaft,
FIG. 2
an enlarged view of the detail Z out FIG. 1 ,

Ausführliche Beschreibung der ZeichnungenDetailed description of the drawings

Figur 1 zeigt ein Ausführungsbeispiel einer erfindungsgemäßen Druckspeicheranordnung für ein nicht dargestelltes hydraulisches Nockenwellenverstellsystem einer Brennkraftmaschine. Die Druckspeicheranordnung ist in einer Nockenwelle der Brennkraftmaschine angeordnet und besteht aus einem Druckspeicher und einem Steuerventil, die als eine Baueinheit ausgebildet sind. Die Nockenwelle ist beidseitig axial offen, beispielsweise als Hohlwelle ausgeführt. In ihrem Inneren weist die Nockenwelle zur Aufnahme der Baueinheit einen zylindrischen Hohlraum auf, der in zwei Abschnitten mit unterschiedlichen Durchmessern jeweils als axiale Zentralbohrung ausgeführt ist. An dem dem Nockenwellenverstellsystem zugewandten Endbereich der Nockenwelle ist in einem ersten Abschnitt des Hohlraums das als ein Zentralventil ausgeführte Steuerventil angeordnet. Das Steuerventil ist dem Nockenwellenverstellsystem vorgeschaltet und besteht aus einer Zentralventilbaugruppe 6, die ein im Wesentlichen zylindrisches Gehäuse aufweist. An den ersten Abschnitt des Hohlraums schließt sich an einer Ringstufe 7 ein gegenüber diesem mit geringfügig reduziertem Durchmesser ausgeführter zweiter Abschnitt an, in dem der Druckspeicher angeordnet ist, der aus einer Druckspeicherbaugruppe 8 besteht. Diese umfasst ein im Wesentlichen hohlzylindrisches Gehäuse, einen Kolben 5 und eine Druckfeder 9. Der Kolben 5 trennt im Innenraum des Gehäuses einen dem Steuerventil axial zugewandten und über dieses mit dem Nockenwellenverstellsystem in Druckmittelverbindung stehenden Druckraum von einem drucklosen Komplementärraum, in dem die Druckfeder 9 aufgenommen ist. Der Kolben 5 ist topfartig ausgebildet, im Gehäuse axial verschiebbar angeordnet und wird an dessen Innenwand geführt. Sowohl das Gehäuse als auch der Kolben 5 sind in Blech ausführbar und spanlos, insbesondere durch Tiefziehen, herstellbar. FIG. 1 shows an embodiment of an accumulator assembly according to the invention for an unillustrated hydraulic camshaft adjusting an internal combustion engine. The accumulator assembly is arranged in a camshaft of the internal combustion engine and consists of a pressure accumulator and a control valve, which are formed as a structural unit. The camshaft is axially open on both sides, for example, designed as a hollow shaft. In its interior, the camshaft for receiving the assembly on a cylindrical cavity, which is designed in two sections with different diameters in each case as an axial central bore. At the camshaft adjusting system end region of the camshaft, the control valve designed as a central valve is arranged in a first section of the cavity. The control valve is upstream of the camshaft adjusting system and consists of a central valve assembly 6, which has a substantially cylindrical housing. The first section of the cavity is adjoined by an annular step 7 with a second section, which is of slightly reduced diameter, in which the pressure accumulator, which consists of a pressure accumulator subassembly 8, is arranged. This includes an im Essentially hollow cylindrical housing, a piston 5 and a compression spring 9. The piston 5 separates in the interior of the housing a control valve axially facing and about this with the Nockenwellenverstellsystem in fluid communication pressure chamber of a pressure-free complementary space in which the compression spring 9 is received. The piston 5 is pot-shaped, arranged axially displaceable in the housing and is guided on the inner wall thereof. Both the housing and the piston 5 are executable in sheet metal and without cutting, in particular by deep drawing, produced.

Die Steuerventil und Druckspeicher sind koaxial in der Nockenwelle angeordnet und an ihren Gehäusen zu einer Baueinheit verbunden. Hierzu sind die einander axial zugewandten hohlzylindrischen Endabschnitte 1, 2 ihrer Gehäuse ineinandergesteckt und bilden einen Pressverband. Denkbar sind auch andere kraftschlüssige und/oder formschlüssige und/oder stoffschlüssige Verbindungen wie z.B. Schraubenverbindungen, Klebeverbindungen oder Verbindungen durch Bördeln. Auf diese Weise bilden Steuerventil und Druckspeicher eine Druckspeicher-Zentralventil-Baueinheit, die als ein Bauteil zur Montage an dem dem Nockenwellenverstellsystem zugewandten offenen Ende der Nockenwelle in den Hohlraum einfach eingeschoben werden kann.The control valve and pressure accumulator are arranged coaxially in the camshaft and connected to their housings to form a structural unit. For this purpose, the mutually axially facing hollow cylindrical end portions 1, 2 of their housing are inserted into one another and form a press fit. Also conceivable are other non-positive and / or positive and / or material connections such. Screw connections, adhesive connections or connections by crimping. In this way, the control valve and pressure accumulator form a pressure accumulator central valve assembly, which can be easily inserted as a component for mounting on the camshaft adjustment system facing the open end of the camshaft into the cavity.

Im Gehäuse des Druckspeichers wird der Kolben 5 an seiner dem Druckraum zugewandten geschlossenen axialen Seite über den Endabschnitt 2 mit Druckmittel beaufschlagt und steht zugleich an seiner vom Druckraum abgewandten axialen Seite mit der als Schraubendruckfeder ausgeführten Druckfeder 9 in Wirkverbindung. Bei Anstieg des Druckmitteldrucks im Nockenwellenverstellsystem strömt Druckmittel über die ineinandergesteckten Endabschnitte 1, 2 in den Druckraum und verschiebt den Kolben 5 entgegen der Federkraft der Schraubendruckfeder axial im Gehäuse des Druckspeichers. Beim Absinken des Druckmitteldrucks expandiert die komprimierte Schraubendruckfeder und stellt dabei die gespeicherte Federenergie und das im Druckraum gespeicherte Druckmittel dem Nockenwellenverstellsystem zur Verfügung. Hierbei stehen Steuerventil und Druckspeicher an ihren ineinandergesteckten hohlzylindrischen Endabschnitten 1, 2 ihrer Gehäuse in unmittelbarer Druckmittelverbindung.In the housing of the pressure accumulator, the piston 5 is acted upon at its pressure chamber facing the closed axial side via the end portion 2 with pressure medium and is at the same time facing away from the pressure chamber axial side with the executed as a helical compression spring compression spring 9 in operative connection. When increasing the pressure medium pressure in the camshaft adjusting pressure fluid flows through the nested end sections 1, 2 in the pressure chamber and moves the piston 5 against the spring force of the helical compression spring axially in the housing of the pressure accumulator. When the pressure medium pressure drops, the compressed helical compression spring expands, thereby making the stored spring energy and the pressure medium stored in the pressure chamber available to the camshaft adjusting system. Here are control valve and pressure accumulator at their nested hollow cylindrical End sections 1, 2 of their housing in the immediate pressure medium connection.

Die Druckmittelleckage am Kolben 5 im Gehäuse des Druckspeichers kann am vom Nockenwellenverstellsystem abgewandten offenen Ende der Nockenwelle über eine Ablaufverbindung zu einem Druckmittelreservoir, beispielsweise dem Motoröltank der Brennkraftmaschine, abgeführt und zugleich das Gehäuse federseitig be- und entlüftet werden.The pressure medium leakage on the piston 5 in the housing of the accumulator can be removed at the averted from the camshaft adjusting open end of the camshaft via a drain connection to a pressure medium reservoir, such as the engine oil tank of the internal combustion engine, and at the same time the housing on the spring side and vented.

Die Schraubendruckfeder ist im Gehäuse des Druckspeichers koaxial angeordnet und greift mit ihrem dem Kolben 5 zugewandten Federendabschnitt in dessen federseitig offenes Ende ein. Der Federendabschnitt liegt dabei an der geschlossenen axialen Seite des Kolbens 5 innen an. An dem vom Kolben 5 abgewandten Federendabschnitt ist die Schraubendruckfeder an einer in das Gehäuse integrierten Federabstützung 10 axial abgestützt. Die Schraubendruckfeder wird bei einer Bewegung des Kolbens 5 an der Innenwand des Gehäuses und an der Innenwand des Kolbens 5 geführt. Zur Begrenzung der Bewegung des Kolbens 5 in gespanntem Zustand der Schraubendruckfeder ist ein in das Gehäuse integrierter axialer Anschlag 11 vorgesehen. Figur 1 zeigt den Kolben 5 in der Position am Anschlag 11 mit gespannter Schraubendruckfeder.The helical compression spring is arranged coaxially in the housing of the pressure accumulator and engages with its the piston 5 facing the spring end in the spring-side open end. The spring end portion rests against the closed axial side of the piston 5 inside. At the spring end section facing away from the piston 5, the helical compression spring is axially supported on a spring support 10 integrated in the housing. The helical compression spring is guided during a movement of the piston 5 on the inner wall of the housing and on the inner wall of the piston 5. To limit the movement of the piston 5 in the tensioned state of the helical compression spring an integrated into the housing axial stop 11 is provided. FIG. 1 shows the piston 5 in the position on the stop 11 with tensioned helical compression spring.

In Figur 2 ist die Druckspeicheranordnung in einem vergrößerten Ausschnitt (Einzelheit Z aus Figur 1) an dem dem Nockenwellenverstellsystem zugewandten Endbereich der Nockenwelle dargestellt. Im ersten Abschnitt des Hohlraums ist die Zentralventilbaugruppe 6 aufgenommen. Diese umfasst das Gehäuse, eine Zwischenhülse und einen in diese aufgenommenen Steuerkolben sowie ein in das Steuerventil integriertes Plattenrückschlagventil 12. Über Arbeitsanschlüsse A, B kommuniziert das Steuerventil mit dem Nockenwellenverstellsystem. Der im Gehäuse axial beweglich angeordnete Steuerkolben ist über einen durch gestrichelte Linien schematisch angedeuteten Zentralmagneten ansteuerbar. An dem dem offenen Ende der Nockenwelle zugewandten Endabschnitt des Steuerkolbens ist ein Ablaufanschluss T ausgebildet, über den Druckmittel aus dem Nockenwellenverstellsystem in ein nicht dargestelltes Druckmittelreservoir abfließen kann.In FIG. 2 is the accumulator assembly in an enlarged section (detail Z out FIG. 1 ) is shown on the camshaft adjusting system facing end portion of the camshaft. In the first section of the cavity, the central valve assembly 6 is received. This comprises the housing, an intermediate sleeve and a control piston accommodated therein and a plate check valve 12 integrated into the control valve. The working valve A, B communicates with the camshaft adjusting system via working ports A, B. The axially movable in the housing arranged control piston is controlled via a dashed lines schematically indicated central magnet. At the end portion of the control piston facing the open end of the camshaft, a drain port T is formed, via which Pressure fluid from the camshaft adjusting system can flow into a non-illustrated pressure medium reservoir.

Das Plattenrückschlagventil 12 dient der Vermeidung einer Rückströmung in Richtung des Druckmittelzulaufanschlusses P und ist in den dem Druckspeicher zugewandten Endbereich des Steuerventils in einem separat ausgeführten Gehäuseteil integriert. Dieses ist an der Außenseite des Gehäuses des Steuerventils in einer ringförmigen radialen Nut formschlüssig aufsteckbar ausgebildet und an seiner dem Druckspeicher zugewandten Seite durch den mit eingezogenem Durchmesser abgesetzten hohlzylindrischen Endabschnitt 1 axial verlängert ausgeführt. Zur Verbindung mit dem Steuerventil ist der diesem zugewandte hohlzylindrische Endabschnitt 2 des Gehäuses des Druckspeichers im Durchmesser eingezogen und in einer Presspassung auf den Endabschnitt 1 axial aufgepresst. Dabei ist der Endabschnitt 1 derart axial verlängert ausgeführt, dass er an seinem stirnseitigen Ende im Gehäuse des Druckspeichers, etwa auf Höhe des durch den eingezogenen Endabschnitt 2 gebildeten Absatzes am Gehäuse, in entspanntem Zustand der Schraubendruckfeder einen Endanschlag für den Kolben 5 bildet.The plate check valve 12 is used to prevent a backflow in the direction of the pressure medium inlet port P and is integrated into the pressure accumulator end facing the control valve in a separately executed housing part. This is formed on the outside of the housing of the control valve in an annular radial groove form-fitting attachable and running on its side facing the pressure accumulator by the remote with retracted diameter hollow cylindrical end portion 1 axially extended. For connection to the control valve of this facing hollow cylindrical end portion 2 of the housing of the pressure accumulator is retracted in diameter and pressed axially in a press fit on the end portion 1. In this case, the end portion 1 is designed so axially extended that it forms an end stop for the piston 5 at its front end in the housing of the pressure accumulator, approximately at the level of the paragraph formed by the retracted end portion 2 paragraph on the housing in the relaxed state of the helical compression spring.

An den jeweils an den Gehäusen mit eingezogenem Durchmesser abgesetzten Gehäuseendabschnitte 1, 2 entsteht im Hohlraum der Nockenwelle ein radialer Ringspalt zur Innenwand der Nockenwelle. Im Bereich des Ringspalts ist an der Nockenwelle der Druckmittelzulaufanschluss P vorgesehen, der über ein nicht dargestelltes Druckmittelsystem, beispielsweise den Motorölkreislauf der Brennkraftmaschine, mit einer Druckmittelpumpe in Verbindung steht. Der Druckmittelzulaufanschluss P weist mehrere über den Umfang verteilte radiale Durchgangsbohrungen an der Nockenwelle auf. Diese korrespondieren radial innen über den Ringspalt mit mehreren zur Druckmittelversorgung der Baueinheit jeweils an den ineinandergesteckten Endabschnitten 1, 2 der Gehäuse über den Umfang verteilt angeordneten Öffnungen 3, 4, die als radiale Durchgangsbohrungen ausgeführt sind. Die Öffnungen 3 am Endabschnitt 1 und die Öffnungen 4 am Endabschnitt 2 sind jeweils radial fluchtend angeordnet.At the housing end sections 1, 2 which are each offset on the housings with retracted diameters, a radial annular gap is formed in the cavity of the camshaft relative to the inner wall of the camshaft. In the region of the annular gap of the pressure medium inlet port P is provided on the camshaft, which is connected via a pressure fluid system, not shown, for example, the engine oil circuit of the internal combustion engine with a pressure medium pump. The pressure medium inlet port P has a plurality of distributed over the circumference radial through holes on the camshaft. These correspond radially inwardly over the annular gap with a plurality of pressure medium supply to the assembly respectively at the nested end portions 1, 2 of the housing distributed over the circumference arranged openings 3, 4, which are designed as radial through holes. The openings 3 at the end portion 1 and the openings 4 at the end portion 2 are each arranged radially in alignment.

Der mit eingezogenem Durchmesser abgesetzte Endabschnitt 1 bildet am Gehäuse des Steuerventils einen Ringabsatz 13, der im montierten Zustand an der Ringstufe 7 an der Innenwand der Nockenwelle im Hohlraum anliegt. Zur Montage können das Steuerventil und der Druckspeicher als eine Bau- und Montageeinheit an dem dem Nockenwellenverstellsystem zugewandten offenen Ende der Nockenwelle eingeschoben werden, bis der Ringabsatz 13 an der Ringstufe 7 anschlägt. Dadurch ist die Baueinheit zugleich im montierten Zustand an der Ringstufe 7 druckspeicherseitig in der Nockenwelle axial gesichert. Ventilseitig erfolgt die axiale Positionssicherung der Baueinheit mittels eines Sicherungsrings 14, der in einer Ringnut an der Innenwand im ersten Hohlraum der Nockenwelle an der vom Druckspeicher axial abgewandten Seite des Gehäuses angeordnet ist. Hierbei liegt das Gehäuse am Sicherungsring 14 stirnseitig axial an.The retracted with retracted diameter end portion 1 forms on the housing of the control valve an annular shoulder 13 which rests in the mounted state on the annular step 7 on the inner wall of the camshaft in the cavity. For assembly, the control valve and the pressure accumulator can be inserted as a construction and mounting unit on the camshaft adjustment system facing open end of the camshaft until the annular shoulder 13 abuts the ring stage 7. As a result, the assembly is axially secured in the assembled state at the ring stage 7 accumulator side in the camshaft. Valve side, the axial position assurance of the assembly takes place by means of a locking ring 14 which is arranged in an annular groove on the inner wall in the first cavity of the camshaft on the axially remote from the pressure accumulator side of the housing. Here, the housing is located on the locking ring 14 frontally axially.

Im ersten Hohlraum der Nockenwelle bilden das Gehäuse des Steuerventils und die Innenwand der Nockenwelle eine zylindrische Spielpassung. Auf diese Weise können Steuerventil und Druckspeicher als eine Baueinheit in der Nockenwelle am Gehäuse des Steuerventils zentriert werden. Dabei ist das Gehäuse des Druckspeichers im zweiten Abschnitt des Hohlraums mit einem radialen Ringspalt zur Innenwand der Nockenwelle angeordnet. Hierdurch können Fertigungstoleranzen am Außendurchmesser des Gehäuses des Druckspeichers ausgeglichen bzw. die Anforderungen an die Fertigungstoleranzen des zweiten Abschnitts des Hohlraums in der Nockenwelle, niedriger angesetzt werden. Zur Führung des Gehäuses im Hohlraum können dabei dieses und die Innenwand der Nockenwelle abschnittweise eine Spielpassung bilden. Hierzu kann beispielsweise am vom Steuerventil abgewandten Endbereich des Gehäuses eine geringfügige Gehäuseaufweitung vorgesehen sein.In the first cavity of the camshaft, the housing of the control valve and the inner wall of the camshaft form a cylindrical clearance fit. In this way, the control valve and pressure accumulator can be centered as a unit in the camshaft on the housing of the control valve. In this case, the housing of the pressure accumulator is arranged in the second portion of the cavity with a radial annular gap to the inner wall of the camshaft. As a result, manufacturing tolerances on the outer diameter of the housing of the pressure accumulator can be compensated or the requirements for the manufacturing tolerances of the second portion of the cavity in the camshaft, be set lower. To guide the housing in the cavity while this and the inner wall of the camshaft sections form a clearance fit. For this purpose, for example, a slight expansion of the housing may be provided on the end region of the housing facing away from the control valve.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Endabschnittend
22
Endabschnittend
33
Öffnungopening
44
Öffnungopening
55
Kolbenpiston
66
ZentralventilbaugruppeCentral valve assembly
77
Ringstufeannular step
88th
DruckspeicherbaugruppeAccumulator assembly
99
Druckfedercompression spring
1010
Federabstützungspring support
1111
Anschlagattack
1212
PlattenrückschlagventilWafer Check Valve
1313
Ringabsatzannular shoulder
1414
Sicherungsringcirclip
AA
Arbeitsanschlussworking port
BB
Arbeitsanschlussworking port
PP
DruckmittelzulaufanschlussPressure fluid inlet port

Claims (3)

  1. Pressure accumulator arrangement of a camshaft for a camshaft adjusting system of an internal combustion engine having at least one pressure accumulator and at least one control valve, characterized in that the pressure accumulator and the control valve are connected to form one structural unit and the pressure accumulator and the control valve are plugged into one another at the end sections (1, 2) of their housings and form a press-fit connection.
  2. Pressure accumulator arrangement according to Claim 1, characterized in that the control valve and the pressure accumulator are configured in each case with a reduced diameter at the end sections (1, 2), which are plugged into one another, of their housings, and the end sections (1, 2) in each case have a plurality of radially aligned openings (3, 4) which are distributed on the circumference, for the pressure medium supply of the structural unit.
  3. Pressure accumulator arrangement according to one of Claims 1 to 3, characterized in that the end section (1) of the housing of the control valve is plugged axially into the end section (2) of the housing of the pressure accumulator and is of extended configuration such that its front-side end forms an end stop for a piston (5) which can be displaced axially in the housing of the pressure accumulator.
EP11714014.5A 2010-04-26 2011-04-04 Pressure accumulator arrangement for a camshaft adjusting system Not-in-force EP2564040B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010018203A DE102010018203A1 (en) 2010-04-26 2010-04-26 Pressure accumulator arrangement for a camshaft adjusting system
PCT/EP2011/055173 WO2011134740A1 (en) 2010-04-26 2011-04-04 Pressure accumulator arrangement for a camshaft adjusting system

Publications (2)

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EP2564040A1 EP2564040A1 (en) 2013-03-06
EP2564040B1 true EP2564040B1 (en) 2017-08-30

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EP11714014.5A Not-in-force EP2564040B1 (en) 2010-04-26 2011-04-04 Pressure accumulator arrangement for a camshaft adjusting system

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US (1) US8820282B2 (en)
EP (1) EP2564040B1 (en)
CN (1) CN102859129B (en)
DE (1) DE102010018203A1 (en)
WO (1) WO2011134740A1 (en)

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Publication number Priority date Publication date Assignee Title
DE102012201567B4 (en) * 2012-02-02 2013-12-05 Schaeffler Technologies AG & Co. KG Design of a hydraulic oil channel between a central valve and a volume accumulator of a camshaft adjuster
DE102012210795B3 (en) * 2012-06-26 2013-09-19 Schaeffler Technologies AG & Co. KG Pressure accumulator for e.g. balancing operational pressure fluctuation in line system of internal combustion engine, has locking device that is provided with locking pipe which is connected with piston
US9121358B2 (en) 2013-02-22 2015-09-01 Borgwarner Inc. Using camshaft timing device with hydraulic lock in an intermediate position for vehicle restarts
US8893677B2 (en) 2013-03-14 2014-11-25 Borgwarner Inc. Dual lock pin phaser
US10001036B2 (en) 2013-06-19 2018-06-19 Borgwarner Inc. Variable camshaft timing mechanism with a lock pin engaged by oil pressure
US20170193644A1 (en) * 2015-12-30 2017-07-06 Ebay Inc Background removal
CN109209548B (en) 2017-06-30 2022-01-25 博格华纳公司 Variable camshaft timing device with two locking positions
DE102019113638B3 (en) * 2019-05-22 2020-09-17 Schaeffler Technologies AG & Co. KG Control valve with an integrated active pressure accumulator

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DE3929621A1 (en) 1989-09-06 1991-03-07 Bayerische Motoren Werke Ag DEVICE FOR RELATIVELY ADJUSTING A SHAFT TO A DRIVE WHEEL, IN PARTICULAR CAMSHAFT OF AN INTERNAL COMBUSTION ENGINE
DE4210580C2 (en) * 1992-03-31 2001-06-28 Bosch Gmbh Robert Device for adjusting the angle of the camshaft of an internal combustion engine
US6871620B2 (en) * 2002-04-09 2005-03-29 Ford Global Technologies, Llc Variable cam timing unit oil supply arrangement
DE10228354B4 (en) * 2002-06-25 2017-06-22 Daimler Ag Device for supplying pressure to a camshaft adjusting device
WO2008140897A1 (en) * 2007-05-14 2008-11-20 Borgwarner Inc. Cam mounted accumulator
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US8820282B2 (en) 2014-09-02
DE102010018203A1 (en) 2011-10-27
US20130008399A1 (en) 2013-01-10
CN102859129B (en) 2015-02-18
EP2564040A1 (en) 2013-03-06
CN102859129A (en) 2013-01-02
WO2011134740A1 (en) 2011-11-03

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