EP2877715B1 - Adjustable camshaft - Google Patents

Adjustable camshaft Download PDF

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Publication number
EP2877715B1
EP2877715B1 EP13739693.3A EP13739693A EP2877715B1 EP 2877715 B1 EP2877715 B1 EP 2877715B1 EP 13739693 A EP13739693 A EP 13739693A EP 2877715 B1 EP2877715 B1 EP 2877715B1
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EP
European Patent Office
Prior art keywords
cam
outer shaft
oil
camshaft
adjustable
Prior art date
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Application number
EP13739693.3A
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German (de)
French (fr)
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EP2877715A1 (en
Inventor
Uwe Dietel
Michael Kunz
Bernd Mann
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Thyssenkrupp Dynamic Components Teccenter AG
Original Assignee
ThyssenKrupp Presta TecCenter AG
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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
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • 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
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • F01L2001/0475—Hollow camshafts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • F01L2001/0476—Camshaft bearings
    • 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
    • Y10T74/00—Machine element or mechanism
    • Y10T74/21—Elements
    • Y10T74/2101—Cams
    • Y10T74/2102—Adjustable

Definitions

  • the present invention relates to an adjustable camshaft for the valve train of an internal combustion engine with an outer shaft, on which at least one first cam is arranged and connected rotationally fixed thereto, and with an extending through the outer shaft inner shaft, with the at least one second cam rotationally connected and on the outer shaft is rotatably supported, and wherein oil from a gap between the outer shaft and the inner shaft through an oil passage in the outer shaft in the region between the second cam and the outer shaft is feasible.
  • U1 is an adjustable camshaft for the valve train of an internal combustion engine with an outer shaft known to be arranged with this rotationally fixed first cam, and wherein extends through the outer shaft an inner shaft, are rotatably connected to the second cam.
  • the second cams are outside on the outer shaft stored. If the inner shaft is rotated in its phase position relative to the outer shaft, then the control position of the first cam relative to the control position of the second cam moves.
  • a cam adjustment device is arranged on the camshaft, which can be activated with pressurized oil.
  • the outer shaft in the region of the second cam at least one oil passage through which oil from the gap is guided in the region between the second cam and the outer shaft.
  • the oil passage is formed by bolt openings in the outer shaft, through which a bolt is guided for coupling the second cam to the inner shaft.
  • the oil can be introduced via a camshaft bearing in the gap between the inner and the outer shaft, wherein a plurality of camshaft bearing for supporting the adjustable camshaft are present in the cylinder head.
  • a camshaft bearing is shown, which is arranged adjacent to a Nockenverstell noticed with which the inner shaft can be rotated relative to the outer shaft in its phase position. It is known that the oil is passed through the adjoining the Nockenverstell responded camshaft bearing in the gap, which, however, has the disadvantage that the design of the camshaft bearing adjacent to the NockenverstellISS must be complicated, since only a limited space is available.
  • the arrangement shown thus does not allow the supply of the cam adjustment with oil from the gap between the inner shaft and the outer shaft, and the oil supply must be carried out separately.
  • the oil supply of the gap between the inner shaft and the outer shaft via an outer camshaft bearing can take place, which is arranged adjacent to the Nockenverstell Rhein and the camshaft stored in the cylinder head.
  • the cam adjustment be supplied directly, at the same time the gap between the inner shaft and the outer shaft is fed with pressure oil.
  • this results in each case connected to the inner shaft second cam pressure loss, since a significant outflow of pressure oil must be determined by the oil passage in the area between the outside of the outer shaft and the second cam. It follows that with further distance from the feed point of the oil on the adjoining the cam adjusting camshaft bearing oil supply individual Verstellnocken is worse. It also follows that the oil must be fed in several places in the gap between the inner shaft and the outer shaft.
  • the object of the invention to provide an adjustable camshaft with an improved oil supply.
  • the task results to provide an improved feed of oil into the gap between the inner shaft and the outer shaft, further, a sufficient and uniform possible supply of all rotatably received on the outer shaft cams should be possible.
  • the invention includes the technical teaching that the second cam is at least partially sealed against the outer shaft by means of at least one sealing element.
  • the invention is based on the idea of minimizing the outflow of oil from the gap between the inner shaft and the outer shaft for oil supply of the area between the rotatable second cam and the outer side of the outer shaft as possible, so that even at a remote from the cam adjustment device feed point of the oil in the gap can still reach a sufficient amount of oil to the cam adjustment. Nevertheless, lubrication of the bearing of the movable cam on the outside shaft can be maintained.
  • a cam adjustment device can be arranged on the end side of the camshaft for phase adjustment between the inner shaft and the outer shaft, which can be supplied with a sufficient amount of oil from the gap.
  • the outer shaft of the camshaft may be supported by at least one camshaft bearing in the cylinder head, wherein preferably a plurality of spaced camshaft bearings are provided to fully support the camshaft over its length.
  • oil can be fed via at least one ⁇ lzu Siliconbohrung from one of the camshaft bearing in the gap.
  • the camshaft bearing can be arranged with the oil feed hole for feeding oil into the gap on a side facing away from the cam adjustment of an adjustable second cam, so that the oil supply of the cam adjustment can be done on the second adjustable cam.
  • the adjustable second cam can form the first adjusting cam adjacent to the cam adjusting device, and by the inventive arrangement of sealing elements between the second cam and the outer side of the outer shaft, the pressure loss of the oil in the gap between the inner shaft and the outer shaft is so low or even eliminated, that even with an injection of oil through a remote camshaft bearing sufficient oil to the Cam adjustment can get.
  • the supply of oil can take place via an end camshaft bearing which, on the side of the camshaft facing away from the cam adjustment device, supports it in the cylinder head. Due to the substantially pressure-tight design of the mounting of the rotatable second cam on the outside of the outer shaft, the pressure loss over the length of the camshaft is so minimal that even with this remote feed of oil sufficient oil can reach the cam adjustment.
  • the adjustable camshaft can be arranged between the adjustable second cam, which forms the first adjusting cam adjacent to the cam and the Nockenverstell noticed even a camshaft bearing, which is designed to be closed to the gap between the inner shaft and the outer shaft.
  • the camshaft bearing adjoining the cam adjusting device forms a simple camshaft bearing without a complicated oil supply for feeding oil into the gap between the inner shaft and the outer shaft.
  • the adjacent to the cam adjustment arrangement of a simple running bearing for rotatably receiving the camshaft in the cylinder head simplifies the structural design of the connection between the cam and the inner shaft and the outer shaft.
  • a bolt may be provided which extends transversely to the axis of rotation of the camshaft.
  • the bolt can be pressed into the inner shaft, so that the ends of the bolt extend through the outer shaft into the second cam. If the inner shaft is rotated relative to the outer shaft, the bolt pivots into bolt openings, which are introduced in the outer shaft and extend oblongally in the circumferential direction.
  • the pressurized oil in the gap between the inner shaft and the outer shaft fills the bolt openings and passes through them in the area between the rotatable second cam and the outer shaft. Consequently, the oil passage for guiding the oil from the gap into the area is formed by the bolt holes.
  • two opposing bolt openings in the Be introduced outer shaft and the bolt is received over both ends diametrically to the axis of rotation of the camshaft in the second cam.
  • two sealing elements can be provided which seal the region between the second cam and the outer shaft toward both axial edge sides.
  • a first sealing element may seal the first edge region in a first axial direction of the camshaft
  • another sealing element may seal the second edge region in a second axial direction of the camshaft.
  • the area between the two sealing elements is thus supplied with oil via the oil passage.
  • the sealing elements may for example be introduced inside a cam bore in the adjustable cam, or the sealing elements are inserted in the outer side of the outer shaft, and between the two sealing elements, a sliding bearing surface for receiving the second cam on the outside of the outer shaft is formed.
  • the sealing element which seals the second cam against the outer shaft, may be made of steel, of a non-ferrous metal or for example of a plastic such as PTFE, POM or rubber.
  • the sealing element may be formed as an O-ring or have a slotted, ie not annularly closed design.
  • the second cam received on and rotatable on the outer shaft has a cam bore through which the outer shaft passes, and the portion between the second cam and the outer shaft is formed between the cam bore and the outer side of the outer shaft.
  • the sealing element can thus be located on the inside in the cam bore or the sealing element is arranged laterally on the second cam, so that this seals the cam bore against the outside of the outer shaft.
  • the sealing element may be formed integrally with the cam, for example, formed from an inwardly formed projection or portion of the cam bore, or the sealing element is formed by a metal ring which is inserted inside the cam bore, for example formed by a brass ring.
  • the camshaft according to the invention may be disposed between the inner shaft and the outer shaft at least one sealing ring, wherein the arrangement of a first sealing ring is provided by the arrangement of the cam adjustment side of the camshaft bearing, which is formed with at least one ⁇ lzu Georgiabohrung.
  • the sealing ring can be designed so that oil in the gap between the inner shaft and the outer shaft can not pass the sealing ring in the axial direction.
  • a particularly advantageous arrangement of the sealing ring results when this side facing away from the arrangement of the cam adjustment device of the camshaft bearing is provided, which is formed with at least one ⁇ lzu Georgiabohrung.
  • the sealing element may be formed such that a small flow of oil from the area between the second cam and the outer shaft remains in the installation environment of the camshaft, wherein the installation environment may be formed for example by the receiving space in the cylinder head of an internal combustion engine.
  • the oil flow through the sealing elements can be so low that nevertheless sufficient oil transport through the gap from the at least one oil feed bore of a camshaft bearing to the cam adjusting device is maintained.
  • the sealing element may comprise a metal seal, and a residual gap between the cam hole in the second cam and the outside of the outer shaft, through which the low oil flow is generated. This ensures that an oil is exchanged in the sliding gap between the cam bore and the outer shaft in order to continuously supply this sliding gap with fresh oil.
  • FIGS. 1 and 2 an embodiment of an adjustable camshaft 1 for the valve train of an internal combustion engine is shown, wherein in FIG. 1 the camshaft 1 is shown cross-sectionally and also the arrangement of a Nockenverstell Stein 17 is shown. Furthermore, in FIG. 1 two camshaft bearings 18, 18 'shown schematically, which are formed together with a part of the cylinder head 19 shown as a sliding bearing.
  • the camshaft 1 has an outer shaft 10 on which two first cams 11 are arranged in the section shown, wherein the first cams 11 are rotationally connected to the outer shaft 10, for example by being pressed onto the outer shaft or welded to the outer shaft.
  • an inner shaft 12 extends, and it is a second cam 13 is shown, which is rotationally connected to the inner shaft 12 via a pin 21.
  • the second cam 13 has a cam bore 24 through which the outer shaft 10 extends, so that the second cam 13 is rotatably supported on the outer shaft 10. Twists the inner shaft 12 relative to the outer shaft 10 by the Nockenverstell Rhein 17 is activated, so shifts the phase position of the second cam 13 relative to the phase position of the first cam 11.
  • the timing of a valve train of the internal combustion engine can be changed while the camshaft 1 to its rotation axis 23 rotates.
  • an annular gap 14 is formed, and the gap 14 is filled with pressurized oil.
  • the oil is directed into the gap 14 via a camshaft bearing 18, and a first camshaft bearing 18 remote from the cam phaser 17 is shown for supporting the camshaft 1 in the cylinder head 19, and another camshaft bearing 18 'is adjacent to the cam phaser 17 arranged.
  • the camshaft bearing 18 remote from the cam phaser 17 has oil supply bores 20 through which oil is directed into the gap 14 between the outer shaft 10 and the inner shaft 12.
  • two oil supply bores 20 which are opposite one another and are shown in section are shown, and a plurality of oil supply bores 20 distributed over the circumference can be provided, which fluidly communicate with one another through an annular gap 25.
  • the oil introduced into the gap 14 can flow in the direction of the cam adjusting device 17, so that the oil passes through the region of the second cam 13 without appreciable pressure loss and at the same time supplies it with oil for lubrication.
  • Oil passages 15 are formed by the bolt holes formed in the outer shaft 10 through which the end faces of the bolt 21 are passed, and oil can be guided through the oil passages 15 out of the gap 14 into the area between the second cam 13 and the outer shaft 10. This area results between the outside of the outer shaft 10 and the cam bore 24 in the second cam 13.
  • the sealing elements 16 are shown by way of example as O-rings and used on the inside in the cam bore 24 in the second cam 13.
  • a sealing ring 22 is arranged adjacent to the oil supply holes 20 in the region of the camshaft bearing 18, which is arranged in the inner shaft 12 and formed for example by an O-ring can be.
  • an oil supply system is provided over the shown portion of the camshaft 1, which is based on oil supply bores 20 arranged remotely from the cam 17 to feed oil into the gap 14, which oil subsequently passes the arrangement of the second cam 13 and the end on the camshaft 1 arranged cam 17 supplied with oil, as indicated by arrows.

Description

Die vorliegende Erfindung betrifft eine verstellbare Nockenwelle für den Ventiltrieb einer Brennkraftmaschine mit einer Außenwelle, auf der wenigstens ein erster Nocken angeordnet und mit dieser verdrehfest verbunden ist, und mit einer sich durch die Außenwelle erstreckenden Innenwelle, mit der wenigstens ein zweiter Nocken verdrehfest verbunden und auf der Außenwelle verdrehbar gelagert ist, und wobei Öl aus einem Spalt zwischen der Außenwelle und der Innenwelle durch einen Ölkanal in der Außenwelle in den Bereich zwischen dem zweiten Nocken und der Außenwelle führbar ist.The present invention relates to an adjustable camshaft for the valve train of an internal combustion engine with an outer shaft, on which at least one first cam is arranged and connected rotationally fixed thereto, and with an extending through the outer shaft inner shaft, with the at least one second cam rotationally connected and on the outer shaft is rotatably supported, and wherein oil from a gap between the outer shaft and the inner shaft through an oil passage in the outer shaft in the region between the second cam and the outer shaft is feasible.

STAND DER TECHNIKSTATE OF THE ART

Aus der DE 20 2005 021 715 U1 ist eine verstellbare Nockenwelle für den Ventiltrieb einer Brennkraftmaschine mit einer Außenwelle bekannt, auf der mit dieser verdrehfest angeordnete erste Nocken angeordnet sind, und wobei sich durch die Außenwelle eine Innenwelle erstreckt, mit der zweite Nocken verdrehfest verbunden sind. Die zweiten Nocken sind außenseitig auf der Außenwelle gelagert. Wird die Innenwelle in ihrer Phasenlage gegenüber der Außenwelle verdreht, so verlagert sich die Steuerposition der ersten Nocken gegenüber der Steuerposition der zweiten Nocken. Zur Änderung der Phasenlage der Innenwelle gegenüber der Phasenlage der Außenwelle ist eine Nockenverstelleinrichtung an der Nockenwelle angeordnet, die mit Drucköl aktiviert werden kann.From the DE 20 2005 021 715 U1 is an adjustable camshaft for the valve train of an internal combustion engine with an outer shaft known to be arranged with this rotationally fixed first cam, and wherein extends through the outer shaft an inner shaft, are rotatably connected to the second cam. The second cams are outside on the outer shaft stored. If the inner shaft is rotated in its phase position relative to the outer shaft, then the control position of the first cam relative to the control position of the second cam moves. To change the phase angle of the inner shaft relative to the phase position of the outer shaft, a cam adjustment device is arranged on the camshaft, which can be activated with pressurized oil.

Im radialen Spalt zwischen der Innenwelle und der Außenwelle wird Öl geführt, das mit Überdruck dem Spalt zugeführt wird. Um den Gleitlagersitz der zweiten Nocken auf der Außenseite der Außenwelle mit Öl zu versorgen, weist die Außenwelle im Bereich der zweiten Nocken wenigstens einen Ölkanal auf, durch den Öl aus dem Spalt in den Bereich zwischen dem zweiten Nocken und der Außenwelle geführt ist. Der Ölkanal wird dabei durch Bolzenöffnungen in der Außenwelle gebildet, durch die ein Bolzen zur Ankopplung des zweiten Nockens an die Innenwelle geführt ist.In the radial gap between the inner shaft and the outer shaft oil is passed, which is supplied with pressure to the gap. In order to supply the sliding bearing seat of the second cam on the outside of the outer shaft with oil, the outer shaft in the region of the second cam at least one oil passage through which oil from the gap is guided in the region between the second cam and the outer shaft. The oil passage is formed by bolt openings in the outer shaft, through which a bolt is guided for coupling the second cam to the inner shaft.

Das Öl kann über ein Nockenwellenlager in den Spalt zwischen der Innen- und der Außenwelle eingeführt werden, wobei mehrere Nockenwellenlager zur Lagerung der verstellbaren Nockenwelle im Zylinderkopf vorhanden sind. In einem Ausführungsbeispiel der DE 20 2005 021 715 U1 ist ein Nockenwellenlager gezeigt, das angrenzend an eine Nockenverstelleinrichtung angeordnet ist, mit der die Innenwelle gegenüber der Außenwelle in ihrer Phasenlage verdreht werden kann. Dabei ist bekannt, dass das Öl über das an die Nockenverstelleinrichtung angrenzende Nockenwellenlager in den Spalt geführt wird, wodurch sich jedoch der Nachteil ergibt, dass die Ausführung des Nockenwellenlagers angrenzend an die Nockenverstelleinrichtung kompliziert aufgebaut werden muss, da nur ein begrenzter Bauraum zur Verfügung steht. Die gezeigte Anordnung ermöglicht damit nicht die Versorgung der Nockenverstelleinrichtung mit Öl aus dem Spalt zwischen der Innenwelle und der Außenwelle, und die Ölversorgung muss separat ausgeführt werden.The oil can be introduced via a camshaft bearing in the gap between the inner and the outer shaft, wherein a plurality of camshaft bearing for supporting the adjustable camshaft are present in the cylinder head. In one embodiment of the DE 20 2005 021 715 U1 a camshaft bearing is shown, which is arranged adjacent to a Nockenverstelleinrichtung with which the inner shaft can be rotated relative to the outer shaft in its phase position. It is known that the oil is passed through the adjoining the Nockenverstelleinrichtung camshaft bearing in the gap, which, however, has the disadvantage that the design of the camshaft bearing adjacent to the Nockenverstelleinrichtung must be complicated, since only a limited space is available. The arrangement shown thus does not allow the supply of the cam adjustment with oil from the gap between the inner shaft and the outer shaft, and the oil supply must be carried out separately.

Gewöhnlich kann die Ölversorgung des Spaltes zwischen der Innenwelle und der Außenwelle über ein äußeres Nockenwellenlager erfolgen, das angrenzend an die Nockenverstelleinrichtung angeordnet ist und die Nockenwelle im Zylinderkopf lagert. Somit kann über das zugeführte Drucköl die Nockenverstelleinrichtung unmittelbar versorgt werden, wobei zugleich der Spalt zwischen der Innenwelle und der Außenwelle mit Drucköl gespeist wird. Nachteilhafterweise ergibt sich dabei bei jedem mit der Innenwelle verbundenen zweiten Nocken ein Druckverlust, da ein erheblicher Abfluss von Drucköl durch den Ölkanal in den Bereich zwischen der Außenseite der Außenwelle und dem zweiten Nocken festgestellt werden muss. Daraus folgt, dass mit weiterer Entfernung von der Einspeisestelle des Öls über das an die Nockenverstelleinrichtung angrenzende Nockenwellenlager die Ölversorgung einzelner Verstellnocken schlechter wird. Daraus folgt weiter, dass das Öl an mehreren Stellten in den Spalt zwischen der Innenwelle und der Außenwelle eingespeist werden muss.Usually, the oil supply of the gap between the inner shaft and the outer shaft via an outer camshaft bearing can take place, which is arranged adjacent to the Nockenverstelleinrichtung and the camshaft stored in the cylinder head. Thus, via the supplied pressure oil, the cam adjustment be supplied directly, at the same time the gap between the inner shaft and the outer shaft is fed with pressure oil. Disadvantageously, this results in each case connected to the inner shaft second cam pressure loss, since a significant outflow of pressure oil must be determined by the oil passage in the area between the outside of the outer shaft and the second cam. It follows that with further distance from the feed point of the oil on the adjoining the cam adjusting camshaft bearing oil supply individual Verstellnocken is worse. It also follows that the oil must be fed in several places in the gap between the inner shaft and the outer shaft.

Wird das Öl über ein von der Nockenverstelleinrichtung entferntes Nockenwellenlager eingespeist, so ergibt sich über den axialen Verlauf des Spaltes bei jedem Verstellnocken ein Druckverlust, sodass die Nockenverstelleinrichtung nicht mehr hinreichend mit Drucköl aus dem Spalt zwischen der Innenwelle und der Außenwelle versorgt ist.If the oil is fed in via a camshaft bearing remote from the cam adjusting device, a pressure loss results for each adjusting cam via the axial profile of the gap, so that the cam adjusting device is no longer adequately supplied with pressurized oil from the gap between the inner shaft and the outer shaft.

OFFENBARUNG DER ERFINDUNGDISCLOSURE OF THE INVENTION

Aus den Nachteilen des Standes der Technik ergibt sich die Aufgabe der Erfindung, eine verstellbare Nockenwelle mit einer verbesserten Ölversorgung zu schaffen. Insbesondere ergibt sich die Aufgabe, eine verbesserte Einspeisung von Öl in den Spalt zwischen der Innenwelle und der Außenwelle zu schaffen, weiterhin sollte eine hinreichende und möglichst gleichmäßige Versorgung aller auf der Außenwelle verdrehbar aufgenommenen Nocken ermöglicht sein. Schließlich ergibt sich die weitere Aufgabe der Erfindung, die Einspeisung von Öl in den Spalt zwischen der Innenwelle und der Außenwelle an einer besser geeigneten Stelle vorzusehen, um zugleich die Nockenverstelleinrichtung mit Öl aus dem Spalt hinreichend zu versorgen.From the disadvantages of the prior art, the object of the invention to provide an adjustable camshaft with an improved oil supply. In particular, the task results to provide an improved feed of oil into the gap between the inner shaft and the outer shaft, further, a sufficient and uniform possible supply of all rotatably received on the outer shaft cams should be possible. Finally, it is the further object of the invention to provide the supply of oil in the gap between the inner shaft and the outer shaft at a more suitable location, at the same time to provide the cam adjustment with oil from the gap sufficient.

Diese Aufgabe wird ausgehend von einer verstellbaren Nockenwelle gemäß Anspruch 1 in Verbindung mit den kennzeichnenden Merkmalen gelöst. Vorteilhafte Weiterbildungen der Erfindung sind in den abhängigen Ansprüchen angegeben.This object is achieved on the basis of an adjustable camshaft according to claim 1 in conjunction with the characterizing features. Advantageous developments of the invention are specified in the dependent claims.

Die Erfindung schließt die technische Lehre ein, dass der zweite Nocken gegen die Außenwelle mittels wenigstens einem Dichtelement zumindest teilweise abgedichtet ist.The invention includes the technical teaching that the second cam is at least partially sealed against the outer shaft by means of at least one sealing element.

Die Erfindung geht von dem Gedanken aus, den Abfluss von Öl aus dem Spalt zwischen der Innenwelle und der Außenwelle zur Ölversorgung des Bereiches zwischen den verdrehbaren zweiten Nocken und der Außenseite der Außenwelle möglichst zu minimieren, sodass auch bei einer von der Nockenverstelleinrichtung entfernten Einspeisestelle des Öls in den Spalt noch eine hinreichende Menge an Öl an die Nockenverstelleinrichtung gelangen kann. Trotzdem kann eine Schmierung der Lagerung des beweglichen Nockens auf der Außenwelle aufrecht erhalten bleiben.The invention is based on the idea of minimizing the outflow of oil from the gap between the inner shaft and the outer shaft for oil supply of the area between the rotatable second cam and the outer side of the outer shaft as possible, so that even at a remote from the cam adjustment device feed point of the oil in the gap can still reach a sufficient amount of oil to the cam adjustment. Nevertheless, lubrication of the bearing of the movable cam on the outside shaft can be maintained.

Durch die erfindungsgemäße Ausführung der verstellbaren Nockenwelle kann zur Phasenverstellung zwischen der Innenwelle und der Außenwelle eine Nockenverstelleinrichtung endseitig an der Nockenwelle angeordnet sein, die mit einer hinreichenden Menge an Öl aus dem Spalt versorgt werden kann. Die Außenwelle der Nockenwelle kann durch zumindest ein Nockenwellenlager im Zylinderkopf gelagert sein, wobei vorzugsweise mehrere zueinander beabstandete Nockenwellenlager vorgesehen sind, um die Nockenwelle über ihrer Länge vollständig zu lagern. Dabei kann Öl über wenigstens eine Ölzuführbohrung aus einem der Nockenwellenlager in den Spalt eingespeist werden.Due to the embodiment of the adjustable camshaft according to the invention, a cam adjustment device can be arranged on the end side of the camshaft for phase adjustment between the inner shaft and the outer shaft, which can be supplied with a sufficient amount of oil from the gap. The outer shaft of the camshaft may be supported by at least one camshaft bearing in the cylinder head, wherein preferably a plurality of spaced camshaft bearings are provided to fully support the camshaft over its length. In this case, oil can be fed via at least one Ölzuführbohrung from one of the camshaft bearing in the gap.

Nach einer besonders vorteilhaften Variante kann das Nockenwellenlager mit der Ölzuführbohrung zur Einspeisung von Öl in den Spalt auf einer der Nockenverstelleinrichtung abgewandten Seite eines verstellbaren zweiten Nockens angeordnet sein, sodass die Ölversorgung der Nockenverstelleinrichtung am verstellbaren zweiten Nocken vorbei erfolgen kann. Dabei kann der verstellbare zweite Nocken den ersten an die Nockenverstelleinrichtung angrenzenden Verstellnocken bilden, und durch die erfindungsgemäße Anordnung von Dichtelementen zwischen dem zweiten Nocken und der Außenseite der Außenwelle ist der Druckverlust des Öls im Spalt zwischen der Innenwelle und der Außenwelle so gering oder sogar beseitigt, dass auch bei einer Einspeisung von Öl über ein entferntes Nockenwellenlager hinreichend Öl an die Nockenverstelleinrichtung gelangen kann. Beispielsweise kann die Einspeisung von Öl über ein End-Nockenwellenlager erfolgen, das auf der der Nockenverstelleinrichtung abgewandten Seite der Nockenwelle diese im Zylinderkopf lagert. Durch die im Wesentlichen druckdichte Ausführung der Lagerung des verdrehbaren zweiten Nockens auf der Außenseite der Außenwelle ist der Druckverlust über der Länge der Nockenwelle so minimal, dass auch bei dieser entfernten Einspeisung von Öl hinreichend Öl an die Nockenverstelleinrichtung gelangen kann.According to a particularly advantageous variant, the camshaft bearing can be arranged with the oil feed hole for feeding oil into the gap on a side facing away from the cam adjustment of an adjustable second cam, so that the oil supply of the cam adjustment can be done on the second adjustable cam. In this case, the adjustable second cam can form the first adjusting cam adjacent to the cam adjusting device, and by the inventive arrangement of sealing elements between the second cam and the outer side of the outer shaft, the pressure loss of the oil in the gap between the inner shaft and the outer shaft is so low or even eliminated, that even with an injection of oil through a remote camshaft bearing sufficient oil to the Cam adjustment can get. For example, the supply of oil can take place via an end camshaft bearing which, on the side of the camshaft facing away from the cam adjustment device, supports it in the cylinder head. Due to the substantially pressure-tight design of the mounting of the rotatable second cam on the outside of the outer shaft, the pressure loss over the length of the camshaft is so minimal that even with this remote feed of oil sufficient oil can reach the cam adjustment.

Nach einer besonders vorteilhaften Ausführungsform der verstellbaren Nockenwelle kann zwischen dem verstellbaren zweiten Nocken, der den ersten Verstellnocken benachbart zur Nockenverstelleinrichtung bildet, und der Nockenverstelleinrichtung selbst ein Nockenwellenlager angeordnet sein, das zum Spalt zwischen der Innenwelle und der Außenwelle geschlossen ausgeführt ist. Damit bildet das an die Nockenverstelleinrichtung angrenzende Nockenwellenlager ein einfaches Nockenwellenlager ohne eine kompliziert aufgebaute Ölversorgung zur Speisung von Öl in den Spalt zwischen der Innenwelle und der Außenwelle. Insbesondere die an die Nockenverstelleinrichtung benachbarte Anordnung eines einfach ausgeführten Lagers zur drehbaren Aufnahme der Nockenwelle im Zylinderkopf vereinfacht sich die konstruktive Ausführung der Verbindung zwischen der Nockenverstelleinrichtung und der Innenwelle und der Außenwelle.According to a particularly advantageous embodiment of the adjustable camshaft can be arranged between the adjustable second cam, which forms the first adjusting cam adjacent to the cam and the Nockenverstelleinrichtung even a camshaft bearing, which is designed to be closed to the gap between the inner shaft and the outer shaft. Thus, the camshaft bearing adjoining the cam adjusting device forms a simple camshaft bearing without a complicated oil supply for feeding oil into the gap between the inner shaft and the outer shaft. In particular, the adjacent to the cam adjustment arrangement of a simple running bearing for rotatably receiving the camshaft in the cylinder head simplifies the structural design of the connection between the cam and the inner shaft and the outer shaft.

Um den zweiten, auf der Außenwelle verdrehbaren Nocken mit der Innenwelle zu verbinden, kann ein Bolzen vorgesehen sein, der sich quer zur Rotationsachse der Nockenwelle erstreckt. Dabei kann der Bolzen in der Innenwelle eingepresst sein, sodass sich die Enden des Bolzens durch die Außenwelle hindurch in den zweiten Nocken hinein erstrecken. Verdreht die Innenwelle gegenüber der Außenwelle, so verschwenkt der Bolzen in Bolzenöffnungen, die in der Außenwelle eingebracht sind und sich in Umfangsrichtung länglich erstrecken. Das unter Druck stehende Öl im Spalt zwischen der Innenwelle und der Außenwelle füllt dabei die Bolzenöffnungen und gelangt über diese in den Bereich zwischen dem verdrehbaren zweiten Nocken und der Außenwelle. Folglich wird der Ölkanal zur Führung des Öls vom Spalt in den Bereich durch die Bolzenöffnungen gebildet. Insbesondere können zwei sich gegenüberliegende Bolzenöffnungen in der Außenwelle eingebracht sein, und der Bolzen ist über beide Enden diametral zur Rotationsachse der Nockenwelle im zweiten Nocken aufgenommen.In order to connect the second, rotatable on the outer shaft cam with the inner shaft, a bolt may be provided which extends transversely to the axis of rotation of the camshaft. In this case, the bolt can be pressed into the inner shaft, so that the ends of the bolt extend through the outer shaft into the second cam. If the inner shaft is rotated relative to the outer shaft, the bolt pivots into bolt openings, which are introduced in the outer shaft and extend oblongally in the circumferential direction. The pressurized oil in the gap between the inner shaft and the outer shaft fills the bolt openings and passes through them in the area between the rotatable second cam and the outer shaft. Consequently, the oil passage for guiding the oil from the gap into the area is formed by the bolt holes. In particular, two opposing bolt openings in the Be introduced outer shaft, and the bolt is received over both ends diametrically to the axis of rotation of the camshaft in the second cam.

Gemäß einer Weiterbildung der verstellbaren Nockenwelle können zwei Dichtelemente vorgesehen sein, die den Bereich zwischen dem zweiten Nocken und der Außenwelle zu beiden axialen Randseiten hin abdichten. Beispielsweise kann ein erstes Dichtelement den ersten Randbereich in einer ersten Axialrichtung der Nockenwelle abdichten, und ein weiteres Dichtelement kann den zweiten Randbereich in einer zweiten Axialrichtung der Nockenwelle abdichten. Der Bereich zwischen den beiden Dichtelementen ist folglich mit Öl über den Ölkanal versorgt. Die Dichtelemente können beispielsweise innenseitig in einer Nockenbohrung im verstellbaren Nocken eingebracht sein, oder die Dichtelemente sind in der Außenseite der Außenwelle eingesetzt, und zwischen den beiden Dichtelementen ist eine Gleitlagerfläche zur Aufnahme des zweiten Nockens auf der Außenseite der Außenwelle gebildet.According to a development of the adjustable camshaft, two sealing elements can be provided which seal the region between the second cam and the outer shaft toward both axial edge sides. For example, a first sealing element may seal the first edge region in a first axial direction of the camshaft, and another sealing element may seal the second edge region in a second axial direction of the camshaft. The area between the two sealing elements is thus supplied with oil via the oil passage. The sealing elements may for example be introduced inside a cam bore in the adjustable cam, or the sealing elements are inserted in the outer side of the outer shaft, and between the two sealing elements, a sliding bearing surface for receiving the second cam on the outside of the outer shaft is formed.

Das Dichtelement, das den zweiten Nocken gegen die Außenwelle abdichtet, kann aus Stahl, aus einem Nichteisenmetall oder beispielsweise aus einem Kunststoff wie beispielsweise PTFE, POM oder aus Gummi, gebildet sein. Insbesondere kann das Dichtelement als O-Ring ausgebildet sein oder eine geschlitzte, d.h. nicht ringförmig geschlossene Ausführung aufweisen. Der zweite, auf der Außenwelle aufgenommene und auf dieser verdrehbare Nocken besitzt eine Nockenbohrung, durch die die Außenwelle hindurch verläuft, und der Bereich zwischen dem zweiten Nocken und der Außenwelle ist zwischen der Nockenbohrung und der Außenseite der Außenwelle gebildet. Das Dichtelement kann somit innenseitig in der Nockenbohrung einsitzen oder das Dichtelement ist seitlich am zweiten Nocken angeordnet, sodass dieses die Nockenbohrung gegen die Außenseite der Außenwelle abdichtet. Auch kann das Dichtelement einteilig mit dem Nocken ausgebildet sein, beispielsweise gebildet aus einem nach innen ausgebildeten Ansatz oder Abschnitt der Nockenbohrung, oder das Dichtelement ist durch einen Metallring gebildet, der innenseitig in der Nockenbohrung eingesetzt ist, beispielsweise gebildet durch einen Messingring.The sealing element, which seals the second cam against the outer shaft, may be made of steel, of a non-ferrous metal or for example of a plastic such as PTFE, POM or rubber. In particular, the sealing element may be formed as an O-ring or have a slotted, ie not annularly closed design. The second cam received on and rotatable on the outer shaft has a cam bore through which the outer shaft passes, and the portion between the second cam and the outer shaft is formed between the cam bore and the outer side of the outer shaft. The sealing element can thus be located on the inside in the cam bore or the sealing element is arranged laterally on the second cam, so that this seals the cam bore against the outside of the outer shaft. Also, the sealing element may be formed integrally with the cam, for example, formed from an inwardly formed projection or portion of the cam bore, or the sealing element is formed by a metal ring which is inserted inside the cam bore, for example formed by a brass ring.

Gemäß einer weiteren Verbesserung der erfindungsgemäßen Nockenwelle kann zwischen der Innenwelle und der Außenwelle wenigstens ein Dichtring angeordnet sein, wobei die Anordnung eines ersten Dichtringes von der Anordnung der Nockenverstelleinrichtung abgewandten Seite des Nockenwellenlagers vorgesehen ist, das mit wenigstens einer Ölzuführbohrung ausgebildet ist. Der Dichtring kann dabei so ausgeführt sein, dass Öl im Spalt zwischen der Innenwelle und der Außenwelle den Dichtring in axialer Richtung nicht passieren kann. Eine besonders vorteilhafte Anordnung des Dichtringes ergibt sich, wenn dieser von der Anordnung der Nockenverstelleinrichtung abgewandten Seite des Nockenwellenlagers vorgesehen ist, das mit wenigstens einer Ölzuführbohrung ausgebildet ist. Somit können über der Länge der Nockenwelle verteilt mehrere fluidisch getrennte Versorgungssegmente zur Versorgung mit Öl aus dem Spalt zwischen der Innenwelle und der Außenwelle erzeugt werden, wobei das der Nockenverstelleinrichtung zugewandte Segment zugleich die Nockenverstelleinrichtung selbst mitversorgt.According to a further improvement of the camshaft according to the invention may be disposed between the inner shaft and the outer shaft at least one sealing ring, wherein the arrangement of a first sealing ring is provided by the arrangement of the cam adjustment side of the camshaft bearing, which is formed with at least one Ölzuführbohrung. The sealing ring can be designed so that oil in the gap between the inner shaft and the outer shaft can not pass the sealing ring in the axial direction. A particularly advantageous arrangement of the sealing ring results when this side facing away from the arrangement of the cam adjustment device of the camshaft bearing is provided, which is formed with at least one Ölzuführbohrung. Thus, distributed over the length of the camshaft can be generated a plurality of fluidly separated supply segments for supplying oil from the gap between the inner shaft and the outer shaft, wherein the Nockenverstelleinrichtung facing segment at the same time mitverduced the cam adjustment itself.

Mit weiterem Vorteil kann das Dichtelement derart ausgebildet sein, dass ein geringer Ölfluss aus dem Bereich zwischen dem zweiten Nocken und der Außenwelle in die Einbauumgebung der Nockenwelle verbleibt, wobei die Einbauumgebung beispielsweise durch den Aufnahmeraum im Zylinderkopf einer Brennkraftmaschine gebildet sein kann. Der Ölfluss durch die Dichtelemente hindurch kann jedoch derart gering sein, dass sich dennoch ein hinreichender Öltransport durch den Spalt von der wenigstens einen Ölzuführbohrung eines Nockenwellenlagers zur Nockenverstelleinrichtung hin aufrechterhalten bleibt.With further advantage, the sealing element may be formed such that a small flow of oil from the area between the second cam and the outer shaft remains in the installation environment of the camshaft, wherein the installation environment may be formed for example by the receiving space in the cylinder head of an internal combustion engine. However, the oil flow through the sealing elements can be so low that nevertheless sufficient oil transport through the gap from the at least one oil feed bore of a camshaft bearing to the cam adjusting device is maintained.

Beispielsweise kann das Dichtelement durch eine Metalldichtung umfassen, und einen Restspalt zwischen der Nockenbohrung im zweiten Nocken und der Außenseite der Außenwelle aufweisen, durch den der geringe Ölfluss erzeugt wird. Damit wird sichergestellt, dass im Gleitspalt zwischen der Nockenbohrung und der Außenwelle ein Ölaustausch erfolgt, um diesen Gleitspalt kontinuierlich mit frischem Öl zu versorgen.For example, the sealing element may comprise a metal seal, and a residual gap between the cam hole in the second cam and the outside of the outer shaft, through which the low oil flow is generated. This ensures that an oil is exchanged in the sliding gap between the cam bore and the outer shaft in order to continuously supply this sliding gap with fresh oil.

BEVORZUGTES AUSFÜHRUNGSBEISPIELPREFERRED EMBODIMENT

Weitere, die Erfindung verbessernde Maßnahmen werden nachstehend gemeinsam mit der Beschreibung eines bevorzugten Ausführungsbeispiels der Erfindung anhand der Figuren näher dargestellt. Es zeigt:

Figur 1
eine quergeschnittene Ansicht eines Ausführungsbeispiels einer verstellbaren Nockenwelle mit den Merkmalen der vorliegenden Erfindung und
Figur 2
eine perspektivische Ansicht des Ausführungsbeispiels der verstellbaren Nockenwelle gemäß Figur 1.
Further, measures improving the invention will be described in more detail below together with the description of a preferred embodiment of the invention with reference to FIGS. It shows:
FIG. 1
a cross-sectional view of an embodiment of an adjustable camshaft with the features of the present invention and
FIG. 2
a perspective view of the embodiment of the adjustable camshaft according to FIG. 1 ,

In den Figuren 1 und 2 ist ein Ausführungsbeispiel einer verstellbaren Nockenwelle 1 für den Ventiltrieb einer Brennkraftmaschine gezeigt, wobei in Figur 1 die Nockenwelle 1 quergeschnitten dargestellt ist und zudem die Anordnung einer Nockenverstelleinrichtung 17 gezeigt ist. Weiterhin sind in Figur 1 zwei Nockenwellenlager 18, 18' schematisch dargestellt, die gemeinsam mit einem gezeigten Teil des Zylinderkopfes 19 als Gleitlager ausgebildet sind.In the FIGS. 1 and 2 an embodiment of an adjustable camshaft 1 for the valve train of an internal combustion engine is shown, wherein in FIG. 1 the camshaft 1 is shown cross-sectionally and also the arrangement of a Nockenverstelleinrichtung 17 is shown. Furthermore, in FIG. 1 two camshaft bearings 18, 18 'shown schematically, which are formed together with a part of the cylinder head 19 shown as a sliding bearing.

Die Nockenwelle 1 weist eine Außenwelle 10 auf, auf der im gezeigten Ausschnitt zwei erste Nocken 11 angeordnet sind, wobei die ersten Nocken 11 mit der Außenwelle 10 verdrehfest verbunden sind, beispielsweise indem diese auf die Außenwelle aufgepresst oder mit der Außenwelle verschweißt sind. Durch die Außenwelle 10 erstreckt sich eine Innenwelle 12, und es ist ein zweiter Nocken 13 gezeigt, der mit der Innenwelle 12 über einen Bolzen 21 verdrehfest verbunden ist. Der zweite Nocken 13 besitzt eine Nockenbohrung 24, durch die sich die Außenwelle 10 hindurch erstreckt, sodass der zweite Nocken 13 auf der Außenwelle 10 drehbar gelagert ist. Verdreht sich die Innenwelle 12 gegenüber der Außenwelle 10, indem die Nockenverstelleinrichtung 17 aktiviert wird, so verlagert sich die Phasenlage des zweiten Nockens 13 gegenüber der Phasenlage des ersten Nockens 11. Dadurch können die Steuerzeiten eines Ventiltriebs der Brennkraftmaschine verändert werden, während die Nockenwelle 1 um ihre Rotationsachse 23 dreht.The camshaft 1 has an outer shaft 10 on which two first cams 11 are arranged in the section shown, wherein the first cams 11 are rotationally connected to the outer shaft 10, for example by being pressed onto the outer shaft or welded to the outer shaft. Through the outer shaft 10, an inner shaft 12 extends, and it is a second cam 13 is shown, which is rotationally connected to the inner shaft 12 via a pin 21. The second cam 13 has a cam bore 24 through which the outer shaft 10 extends, so that the second cam 13 is rotatably supported on the outer shaft 10. Twists the inner shaft 12 relative to the outer shaft 10 by the Nockenverstelleinrichtung 17 is activated, so shifts the phase position of the second cam 13 relative to the phase position of the first cam 11. Thus, the timing of a valve train of the internal combustion engine can be changed while the camshaft 1 to its rotation axis 23 rotates.

Zwischen der Außenwelle 10 und der Innenwelle 12 ist ein ringförmiger Spalt 14 ausgebildet, und der Spalt 14 ist mit unter Druck stehendem Öl gefüllt. Das Öl wird über ein Nockenwellenlager 18 in den Spalt 14 geleitet, und es ist zur Lagerung der Nockenwelle 1 im Zylinderkopf 19 ein erstes Nockenwellenlager 18 gezeigt, das von der Nockenverstelleinrichtung 17 entfernt angeordnet ist, und ein weiteres Nockenwellenlager 18' ist angrenzend an die Nockenverstelleinrichtung 17 angeordnet. Das von der Nockenverstelleinrichtung 17 entfernt angeordnete Nockenwellenlager 18 weist Ölzuführbohrungen 20 auf, durch die Öl in den Spalt 14 zwischen der Außenwelle 10 und der Innenwelle 12 geleitet wird. Dabei sind zwei sich gegenüberliegende, im Schnitt gezeigte Ölzuführbohrungen 20 gezeigt, und es können über dem Umfang verteilt mehrere Ölzuführbohrungen 20 vorgesehen sein, die durch einen Ringspalt 25 fluidisch miteinander in Verbindung stehen. Das in den Spalt 14 eingeleitete Öl kann in Richtung zur Nockenverstelleinrichtung 17 fließen, sodass das Öl ohne nennenswerten Druckverlust den Bereich des zweiten Nockens 13 passiert und diesen zugleich mit Öl zur Schmierung versorgt.Between the outer shaft 10 and the inner shaft 12, an annular gap 14 is formed, and the gap 14 is filled with pressurized oil. The oil is directed into the gap 14 via a camshaft bearing 18, and a first camshaft bearing 18 remote from the cam phaser 17 is shown for supporting the camshaft 1 in the cylinder head 19, and another camshaft bearing 18 'is adjacent to the cam phaser 17 arranged. The camshaft bearing 18 remote from the cam phaser 17 has oil supply bores 20 through which oil is directed into the gap 14 between the outer shaft 10 and the inner shaft 12. In this case, two oil supply bores 20 which are opposite one another and are shown in section are shown, and a plurality of oil supply bores 20 distributed over the circumference can be provided, which fluidly communicate with one another through an annular gap 25. The oil introduced into the gap 14 can flow in the direction of the cam adjusting device 17, so that the oil passes through the region of the second cam 13 without appreciable pressure loss and at the same time supplies it with oil for lubrication.

Durch die in der Außenwelle 10 eingebrachten Bolzenöffnungen, durch die die Endseiten des Bolzens 21 hindurchgeführt sind, bilden sich Ölkanäle 15, und Öl kann durch die Ölkanäle 15 aus dem Spalt 14 in den Bereich zwischen dem zweiten Nocken 13 und der Außenwelle 10 geführt werden. Dieser Bereich ergibt sich zwischen der Außenseite der Außenwelle 10 und der Nockenbohrung 24 im zweiten Nocken 13.Oil passages 15 are formed by the bolt holes formed in the outer shaft 10 through which the end faces of the bolt 21 are passed, and oil can be guided through the oil passages 15 out of the gap 14 into the area between the second cam 13 and the outer shaft 10. This area results between the outside of the outer shaft 10 and the cam bore 24 in the second cam 13.

Um zu verhindern, dass Öl aus dem Bereich zwischen dem zweiten Nocken 13 und der Außenwelle 10 in die Einbauumgebung der Nockenwelle 1 gelangt, sodass sich beim Passieren des Öls durch den Spalt 14 vorbei am zweiten Nocken 13 ein Druckverlust im Spalt 14 ergibt, ist erfindungsgemäß vorgesehen, dass der zweite Nocken 13 gegen die Außenwelle 10 mittels Dichtelementen 16 zumindest teilweise abgedichtet ist. Dadurch wird erreicht, dass beim Passieren des Öls vorbei am zweiten Nocken 13 kein oder nur ein geringer Druckverlust entsteht, und die Nockenverstelleinrichtung 17 kann gemäß der gezeigten Anordnung von einem von diesem entfernt angeordneten Nockenwellenlager 18 mit Öl versorgt werden.In order to prevent that oil from the area between the second cam 13 and the outer shaft 10 in the installation environment of the camshaft 1 passes, so that when passing the oil through the gap 14 past the second cam 13, a pressure drop in the gap 14 results, is according to the invention provided that the second cam 13 is at least partially sealed against the outer shaft 10 by means of sealing elements 16. This ensures that when passing the oil past the second cam 13 no or only a slight pressure loss occurs, and the Nockenverstelleinrichtung 17 can be supplied according to the arrangement shown by a remote from this camshaft bearing 18 with oil.

Die Dichtelemente 16 sind beispielhaft als O-Ringe gezeigt und innenseitig in der Nockenbohrung 24 im zweiten Nocken 13 eingesetzt.The sealing elements 16 are shown by way of example as O-rings and used on the inside in the cam bore 24 in the second cam 13.

Um ein Abfließen des Öls durch den Spalt 14 in den weiteren Verlauf der Nockenwelle 1 zu verhindern, ist benachbart zu den Ölzuführbohrungen 20 im Bereich des Nockenwellenlagers 18 ein Dichtring 22 angeordnet, der in der Innenwelle 12 angeordnet ist und beispielsweise durch einen O-Ring gebildet sein kann. Dadurch wird ein Ölversorgungssystem über den gezeigten Abschnitt der Nockenwelle 1 geschaffen, das darauf basiert, über entfernt von der Nockenverstelleinrichtung 17 angeordnete Ölzuführbohrungen 20 Öl in den Spalt 14 einzuspeisen, welches Öl anschließend die Anordnung des zweiten Nockens 13 passiert und die endseitig an der Nockenwelle 1 angeordnete Nockenverstelleinrichtung 17 mit Öl versorgt, wie dies mit Pfeilen angedeutet ist.In order to prevent the oil from flowing through the gap 14 in the further course of the camshaft 1, a sealing ring 22 is arranged adjacent to the oil supply holes 20 in the region of the camshaft bearing 18, which is arranged in the inner shaft 12 and formed for example by an O-ring can be. Thereby, an oil supply system is provided over the shown portion of the camshaft 1, which is based on oil supply bores 20 arranged remotely from the cam 17 to feed oil into the gap 14, which oil subsequently passes the arrangement of the second cam 13 and the end on the camshaft 1 arranged cam 17 supplied with oil, as indicated by arrows.

Die Erfindung beschränkt sich in ihrer Ausführung nicht auf das vorstehend angegebene bevorzugte Ausführungsbeispiel. Vielmehr ist eine Anzahl von Varianten denkbar, welche von der dargestellten Lösung auch bei grundsätzlich anders gearteten Ausführungen Gebrauch macht. Sämtliche aus den Ansprüchen, der Beschreibung oder den Zeichnungen hervorgehenden Merkmale und/oder Vorteile, einschließlich konstruktiver Einzelheiten oder räumliche Anordnungen, können sowohl für sich als auch in den verschiedensten Kombinationen erfindungswesentlich sein.The invention is not limited in its execution to the above-mentioned preferred embodiment. Rather, a number of variants is conceivable, which makes use of the illustrated solution even with fundamentally different types of use. Any features and / or advantages resulting from the claims, the description or the drawings, including constructive details or spatial arrangements, can be essential to the invention, both individually and in the most diverse combinations.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
verstellbare Nockenwelleadjustable camshaft
1010
Außenwelleouter shaft
1111
erster Nockenfirst cam
1212
Innenwelleinner shaft
1313
zweiter Nockensecond cam
1414
Spaltgap
1515
Ölkanaloil passage
1616
Dichtelementsealing element
1717
NockenverstelleinrichtungNockenverstelleinrichtung
18, 18'18, 18 '
Nockenwellenlagercamshaft bearings
1919
Zylinderkopfcylinder head
2020
Ölzuführbohrungoil feed
2121
Bolzenbolt
2222
Dichtringseal
2323
Rotationsachseaxis of rotation
2424
Nockenbohrungcam bore
2525
Ringspaltannular gap

Claims (9)

  1. Adjustable camshaft (1) for the valve gear of an internal combustion engine, which camshaft having an outer shaft (10), on which at least one first cam (11) is arranged which is connected fixedly to said outer shaft (10) so as to rotate with it, and having an inner shaft (12) which extends through the outer shaft (10) and to which at least one second cam (13) is connected fixedly so as to rotate with it and is mounted rotatably on the outer shaft (10), and it being possible for oil to be conducted from a gap (14) between the outer shaft (10) and the inner shaft (12) through an oil duct (15) in the outer shaft (10) into the region between the second cam (13) and the outer shaft (10), characterized in that the second cam (13) is sealed at least partially against the outer shaft (10) by means of two sealing elements (16), the two sealing elements (16) sealing the region between the second cam (13) and the outer shaft (10) toward both axial edge sides, the sealing elements (16) being seated on the inner side in the adjustable second cam (13) or in the outer side of the outer shaft (10) and a plain bearing face being enclosed between the sealing elements (16).
  2. Adjustable camshaft (1) according to Claim 1, characterized in that a cam adjusting device (17) is provided which is supplied with oil from the gap (14).
  3. Adjustable camshaft (1) according to Claim 1 or 2, characterized in that the outer shaft (10) is mounted in the cylinder head (19) by at least one camshaft bearing (18), oil being fed through at least one oil feed bore (20) via the camshaft bearing (18) into the gap (14).
  4. Adjustable camshaft (1) according to one of Claims 1 to 3, characterized in that the camshaft bearing (18) is arranged with the oil feed bore (20) for feeding oil into the gap (14) on a side of the adjustable second cam (13), which side faces away from the cam adjusting device (17), with the result that the oil supply of the cam adjusting device (17) takes place past the adjustable second cam (13).
  5. Adjustable camshaft (1) according to one of the preceding claims, characterized in that a camshaft bearing (18') is arranged between the adjustable second cam (13) and the cam adjusting device (17), which camshaft bearing (18') is configured, in particular, so as to be closed for the passage of oil into the gap (14).
  6. Adjustable camshaft (1) according to one of the preceding claims, characterized in that the connection of the second cam (13) to the inner shaft (12) is formed by a pin (21) which extends through at least one pin opening in the outer shaft (10), the oil duct (15) being formed for conducting oil into the region between the second cam (13) and the outer shaft (10) through the pin opening.
  7. Adjustable camshaft (1) according to one of the preceding claims, characterized in that the sealing element (16) is formed from steel, from a non-ferrous metal or from plastic, such as PTFE, POM or rubber, and/or is configured as an O-ring or has a slotted configuration.
  8. Adjustable camshaft (1) according to one of the preceding claims, characterized in that at least one sealing ring (22) is arranged between the inner shaft (12) and the outer shaft (10), the arrangement of a first sealing ring (22) being provided on that side of the camshaft bearing (18) which faces away from the cam adjusting device (17), which camshaft bearing (18) is configured with at least one oil feed bore (20).
  9. Adjustable camshaft (1) according to one of the preceding claims, characterized in that the sealing element (16) is configured in such a way that a small oil flow takes place from the region between the second cam (13) and the outer shaft (10) into the installation surroundings of the camshaft (1), whereas, however, a sufficient oil flow is maintained through the gap (14) from the at least one oil feed bore (20) to the cam adjusting device (17).
EP13739693.3A 2012-07-27 2013-07-19 Adjustable camshaft Active EP2877715B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012106856.9A DE102012106856B4 (en) 2012-07-27 2012-07-27 Adjustable camshaft
PCT/EP2013/065299 WO2014016215A1 (en) 2012-07-27 2013-07-19 Adjustable camshaft

Publications (2)

Publication Number Publication Date
EP2877715A1 EP2877715A1 (en) 2015-06-03
EP2877715B1 true EP2877715B1 (en) 2016-11-30

Family

ID=48832912

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13739693.3A Active EP2877715B1 (en) 2012-07-27 2013-07-19 Adjustable camshaft

Country Status (4)

Country Link
US (1) US9617876B2 (en)
EP (1) EP2877715B1 (en)
DE (1) DE102012106856B4 (en)
WO (1) WO2014016215A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013007741A1 (en) * 2013-05-07 2014-11-13 Thyssenkrupp Presta Teccenter Ag camshaft
DE102015113356A1 (en) 2015-08-13 2017-02-16 Thyssenkrupp Ag Adjustable camshaft with a phase plate
DE102015117920B4 (en) * 2015-10-21 2023-01-19 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Camshaft arrangement in an internal combustion engine
DE102020207134A1 (en) 2020-06-08 2021-12-09 Mahle International Gmbh Adjustable camshaft

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EP2634385A1 (en) 2012-02-29 2013-09-04 MAHLE International GmbH Adjustable Camshaft

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US6691656B1 (en) 2002-11-27 2004-02-17 Delphi Technologies, Inc. Cam phaser hydraulic seal assembly
DE102005014680A1 (en) 2005-02-03 2006-08-10 Mahle International Gmbh Camshaft with mutually rotatable cam for motor vehicles in particular
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DE102005062207A1 (en) 2005-12-24 2007-06-28 Mahle International Gmbh Camshaft especially for motor vehicle engines has coaxial inner and outer camshafts with inner shaft being secured on inner surface of outer shaft
EP2048385A1 (en) 2007-10-11 2009-04-15 Carl Freudenberg KG Bearing assembly
JP2009144522A (en) 2007-12-11 2009-07-02 Honda Motor Co Ltd Valve gear equipped with phase control means
DE102009049217A1 (en) 2009-10-13 2011-04-28 Mahle International Gmbh Internal combustion engine with at least one camshaft
EP2325472A1 (en) 2009-11-23 2011-05-25 Robert Bosch GmbH Seal assembly and valve with same
JP2011117414A (en) 2009-12-07 2011-06-16 Mitsubishi Motors Corp Variable valve gear of internal combustion engine
US20110197839A1 (en) 2010-02-12 2011-08-18 Daisuke Yoshika Internal combustion engine with variable valve device
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Also Published As

Publication number Publication date
DE102012106856A1 (en) 2014-01-30
WO2014016215A1 (en) 2014-01-30
EP2877715A1 (en) 2015-06-03
US9617876B2 (en) 2017-04-11
DE102012106856B4 (en) 2019-05-29
US20150152750A1 (en) 2015-06-04

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