EP2494157A1 - Camshaft adjusting assembly - Google Patents

Camshaft adjusting assembly

Info

Publication number
EP2494157A1
EP2494157A1 EP10771733A EP10771733A EP2494157A1 EP 2494157 A1 EP2494157 A1 EP 2494157A1 EP 10771733 A EP10771733 A EP 10771733A EP 10771733 A EP10771733 A EP 10771733A EP 2494157 A1 EP2494157 A1 EP 2494157A1
Authority
EP
European Patent Office
Prior art keywords
camshaft
adjusting arrangement
arrangement according
housing element
control valve
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.)
Granted
Application number
EP10771733A
Other languages
German (de)
French (fr)
Other versions
EP2494157B1 (en
Inventor
Ali Bayrakdar
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schaeffler Technologies AG and Co KG
Original Assignee
Schaeffler Technologies AG and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Schaeffler Technologies AG and Co KG filed Critical Schaeffler Technologies AG and Co KG
Publication of EP2494157A1 publication Critical patent/EP2494157A1/en
Application granted granted Critical
Publication of EP2494157B1 publication Critical patent/EP2494157B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • F01L2001/0476—Camshaft bearings

Definitions

  • the invention relates to a camshaft adjusting arrangement for changing the relative angular position of a camshaft relative to a crankshaft of an internal combustion engine, wherein the camshaft adjusting arrangement comprises a drive element driven by the crankshaft, which is mounted rotatably relative to the camshaft, wherein at least two hydraulic chambers are formed between the drive element and the camshaft, which are acted upon by a pressurized fluid to adjust a defined relative rotational position between the drive element and the camshaft, wherein for controlling the flow of the pressurized fluid into the hydraulic chambers, a control valve is provided, wherein the control valve supplied from the region of a camshaft bearing via a fluid passage with pressurized fluid becomes.
  • Camshaft adjusting devices of this type are well known in the prior art, reference being made by way of example to DE 10 2005 052 481 A1 and to DE 10 2005 041 393 A1.
  • the camshaft adjuster there is an impeller in which vanes are molded or arranged.
  • the wings are located in hydraulic chambers, which are incorporated in an outer rotor.
  • By appropriately loading the respective side of the hydraulic chambers with hydraulic fluid an adjustment of the inner rotor relative to the outer rotor can take place between an "early stop” and a "late stop”.
  • the flow of hydraulic oil is controlled by an electrically controlled directional control valve.
  • the valve has a housing into which a valve bore is introduced.
  • a control piston can move in a direction of displacement relative to the housing, for which purpose an electromagnetically actuated linear displacement element is used.
  • the linear displacement element of the valve is acted upon by the vehicle electrics or electronics with such a control current that - depending on the engine parameters - a desired camshaft adjustment or adjustment of the gas exchange valves is accomplished.
  • the pressurized hydraulic oil is guided by a hydraulic pump via the cylinder head and over the area of the camshaft bearing via said fluid channel into the hydraulic chambers.
  • the present invention is based on the A u fg abe, a camshaft adjusting arrangement of the type mentioned in such a way that it is possible to make the fluid channel in the region of the camshaft bearing and its connection to the further fluid path so that the production of the arrangement easier and thus cheaper. Furthermore, it should be avoided to edit the camshaft in the region of their connection to the camshaft adjuster, so that their mechanical strength is weakened. Finally, it should also be possible to be able to use a hollow shaft as the camshaft.
  • the fluid channel comprises an annular space which is installed between the axial end of the at least partially rohrformig trained camshaft, a flange-like portion of a non-rotatably connected to the camshaft housing member in which the control valve is installed, a radially inner boundary surface of the housing member and a portion of the wall of the camshaft bearing is formed.
  • the annular space is preferably formed rectangular in radial section.
  • the control valve may comprise a central screw with which it is fixed in the housing element coaxial with the camshaft.
  • the camshaft is preferably fastened directly to the housing element.
  • the attachment of the camshaft to the housing element is preferably carried out by an interference fit between an inner cylindrical portion of the camshaft and a cylindrical portion of the housing member.
  • the attachment can also be done by a cohesive connection; this can be formed as a soldering, in particular as Hartverlötung, or as a weld, in particular as a laser beam or electron beam welding.
  • the housing member may further include an axial abutment surface for the axial end of the camshaft to define a defined axial end position relative to the housing member for the camshaft.
  • the flange-like portion of the housing member preferably forms an axial bearing surface for the camshaft bearing, whereby an axial bearing function is also provided for the camshaft.
  • the fluid channel for the pressure fluid preferably comprises a plurality of bores which pass through the housing element, wherein the bores are preferably arranged at an angle between 30 ° and 60 ° to the axis of the camshaft.
  • camshaft adjuster can be achieved when using a central valve for controlling the pressurized fluid that at least partially a tube can be used as the base body for the camshaft, which offers corresponding weight advantages.
  • Fig. 1 shows the radial section through a Nockenwellenverstellaniser a
  • FIG. 2 shows an illustration of an alternative embodiment of the camshaft adjusting arrangement according to a second embodiment of the invention
  • FIG. 2 is an illustration of an alternative embodiment of the camshaft adjusting arrangement according to a first embodiment of the invention
  • FIG. 3 in the representation according to FIG. 1 shows a further alternative embodiment of the camshaft adjusting arrangement according to a third embodiment
  • FIG. 4 in the illustration of FIG. 1, a further alternative embodiment of the camshaft adjusting arrangement according to a fourth embodiment of the invention and
  • Fig. 5 shows the area of the control valve including camshaft approach and camshaft bearing in an enlarged view.
  • FIGS. 1 to 4 Four embodiments of the camshaft adjusting arrangement 1 of an internal combustion engine according to the invention are shown in FIGS. 1 to 4, which ultimately differ only in the manner in which a control valve 4 is actuated in order to selectively direct pressurized fluid into hydraulic chambers (not shown) to make a camshaft adjustment in a known manner.
  • the basic structure and functioning correspond to DE 10 2005 052 481 A1 of the Applicant, to which reference is made in this respect in its entirety.
  • the camshaft adjusting arrangement 1 via a (not shown) drive element - usually a chain or a toothed belt - a drive element 3, which is designed to perform a targeted rotation by a defined relative angle of rotation between the crankshaft of the internal combustion engine and a camshaft 2, to influence the operating behavior of the internal combustion engine in a known manner.
  • the flow of pressurized hydraulic fluid into the hydraulic chambers is accomplished by a control valve 4 actuated by an actuator 20 by being displaced in the axial direction (corresponding to the axial direction of the camshaft 2) against the action of a spring.
  • the control valve 4 consists of a pressure fluid feed insert 21 (see the detailed view according to FIG. 5), which is seated axially displaceably in a control valve 22.
  • the control valve 22 in turn is fixedly arranged in a housing element 12, which acts as an adapter.
  • the control valve 22 has a central screw 15 which is screwed into a thread in the housing element 12.
  • the pressurized fluid for actuating the camshaft adjusting arrangement 1 must be led by a pump (not shown) over the area of a camshaft bearing 5 to the pressurized medium insert 21.
  • the camshaft bearing 5 supports the camshaft 2, so that it is rotatable relative to the camshaft bearing 5 and thus also to the drive element 3.
  • a fluid channel is provided which has the sections 6, 7, 8 and 9.
  • the section 7 consists of several, z. B. three or four, holes are introduced at an angle to the axis of the camshaft 2 in the housing member 12. Then an annular space 9 between formed the housing member 12 and the control valve 22, via which the fluid is continued.
  • transverse bores 9 are introduced, via which the pressure fluid passes to the Druckstoffleitdon 21.
  • the design of the first fluid channel 6 is decisive, which establishes the connection between a pressure line (not shown), which is connected to the fluid pump, and the fluid channel 7.
  • the annular space 6 is formed so that the camshaft 2 is not mechanically processed and thus weakened to its formation.
  • the camshaft 2 is in the present case designed as a tube having an axial end 10.
  • the housing member 12 has in its (right) axial end portion of a cylindrical portion 17 which forms an axial abutment surface 18 for the end 10 of the camshaft 2 at a gradation.
  • the camshaft 2 in turn has an inner cylindrical portion 16 which is pushed onto the cylindrical portion 17 until the end 10 of the camshaft 2 abuts the axial abutment surface 18.
  • housing element 12 and the camshaft 2 are permanently connected, for example by welding or soldering. Furthermore, it can be alternatively or additionally provided that between the cylindrical portion 17 of the housing member 2 and the inner cylindrical portion 16 of the camshaft 2 is press-fitted, so that in this way the solid bond between the camshaft 2 and housing member 12 is produced. A positive connection (eg by means of a thread) between housing element 12 and camshaft 2 would also be possible.
  • the housing element 12 further has a flange-like portion 11 having a radially extending side surface which simultaneously forms an axial bearing surface or contact surface 19 for the camshaft bearing 5.
  • the two radially extending surfaces which are formed by the axial end 10 of the camshaft 2 and by the axial bearing surface 19 on the housing element 12 den, form the lateral boundary surfaces of the annular space-shaped Fluidka- channel. 6
  • radial boundary surfaces are formed by a radially inner cylindrical boundary surface 13, which is formed in the outer periphery of the housing member 12, and by a cylindrical part of the wall 14 of the camshaft bearing fifth
  • annular space 6 is formed as a fluid channel, which has a rectangular shape in the radial section.
  • the advantage of this embodiment is, on the one hand, that a tube can be used without problems as a camshaft 2, since the connection to the housing element 12, as explained, can be space-saving and advantageous. Furthermore, the camshaft 2 itself does not have to be machined to create the fluid channel 6. In the prior art, it has hitherto been necessary for recesses to be incorporated into the camshaft, which not only requires a corresponding production outlay, but also entails a mechanical weakening of the camshaft 2.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Abstract

The invention relates to a camshaft adjustment assembly (1), wherein a control valve (4) is provided for controlling the flow of the pressure fluid in the hydraulic chamber, wherein the control valve (4) is supplied with pressure fluid from the region of a camshaft bearing (5) by means of a fluid channel (6, 7, 8, 9). In order to enable an improved fluid line at low component weakening, according to the invention the fluid channel (6, 7, 8, 9) comprises an annular chamber (6), which is formed between the axial end (10) of the camshaft (2) at least sections of which have a tubular design, a flange-like section (11) of a housing element (12) that is non-rotationally connected to the camshaft (2) and in which the control valve (4) is mounted, a radially inner delimiting surface (13) of the housing element (12), and a section (14) of the wall of the camshaft bearing (5).

Description

Bezeichnung der Erfindung  Name of the invention
Nockenwellenverstellanordnung Beschreibung Camshaft adjusting arrangement Description
Gebiet der Erfindung Field of the invention
Die Erfindung betrifft eine Nockenwellenverstellanordnung zur Veränderung der relativen Winkellage einer Nockenwelle gegenüber einer Kurbelwelle einer Brennkraftmaschine, wobei die Nockenwellenverstellanordnung ein von der Kurbelwelle angetriebenes Antriebselement umfasst, das gegenüber der Nockenwelle drehbar gelagert ist, wobei zwischen dem Antriebselement und der Nockenwelle mindestens zwei Hydraulikkammern ausgebildet sind, die mit einem Druckfluid beaufschlagbar sind, um eine definierte relative Drehstellung zwischen dem Antriebselement und der Nockenwelle einzustellen, wobei zur Steuerung des Flusses des Druckfluids in die Hydraulikkammern ein Steuerventil vorgesehen ist, wobei das Steuerventil von dem Bereich eines Nockenwellenlagers aus über einen Fluidkanal mit Druckfluid versorgt wird. Hintergrund der Erfindung The invention relates to a camshaft adjusting arrangement for changing the relative angular position of a camshaft relative to a crankshaft of an internal combustion engine, wherein the camshaft adjusting arrangement comprises a drive element driven by the crankshaft, which is mounted rotatably relative to the camshaft, wherein at least two hydraulic chambers are formed between the drive element and the camshaft, which are acted upon by a pressurized fluid to adjust a defined relative rotational position between the drive element and the camshaft, wherein for controlling the flow of the pressurized fluid into the hydraulic chambers, a control valve is provided, wherein the control valve supplied from the region of a camshaft bearing via a fluid passage with pressurized fluid becomes. Background of the invention
Nockenwellenverstellvorrichtungen dieser Art sind im Stand der Technik hinlänglich bekannt, wobei exemplarisch auf die DE 10 2005 052 481 A1 und auf die DE 10 2005 041 393 A1 hingewiesen wird. In dem Nockenwellenversteller ist ein Flügelrad vorhanden, in dem Flügel eingeformt oder angeordnet sind. Die Flügel befinden sich in Hydraulikkammern, die in einem Außenrotor eingearbeitet sind. Durch entsprechende Beaufschlagung der jeweiligen Seite der Hydraulikkammern mit Hydraulikfluid kann eine Verstellung des Innenrotors relativ zum Außenrotor zwischen einem„Frühanschlag" und einem„Spätanschlag" erfolgen. Dabei wird der Fluss von Hydrauliköl durch ein elektrisch angesteuertes Wegeventil gesteuert. Das Ventil weist ein Gehäuse auf, in das eine Ventilbohrung eingebracht ist. Ein Steuerkolben kann sich in eine Verschieberichtung relativ zum Gehäuse bewegen, wofür ein elektromagnetisch betätigtes Linearverschiebeelement eingesetzt wird. Im Betrieb der Brennkraftmaschine wird das Linearverschiebelement des Ventils von der Fahrzeugelektrik bzw. -elektronik mit einem solchen Steuerstrom beaufschlagt, dass - in Abhängigkeit der Motorparameter - eine gewünschte Nockenwellenverstellung bzw. Verstellung der Gaswechselventile bewerkstelligt wird. Camshaft adjusting devices of this type are well known in the prior art, reference being made by way of example to DE 10 2005 052 481 A1 and to DE 10 2005 041 393 A1. In the camshaft adjuster, there is an impeller in which vanes are molded or arranged. The wings are located in hydraulic chambers, which are incorporated in an outer rotor. By appropriately loading the respective side of the hydraulic chambers with hydraulic fluid, an adjustment of the inner rotor relative to the outer rotor can take place between an "early stop" and a "late stop". The flow of hydraulic oil is controlled by an electrically controlled directional control valve. The valve has a housing into which a valve bore is introduced. A control piston can move in a direction of displacement relative to the housing, for which purpose an electromagnetically actuated linear displacement element is used. During operation of the internal combustion engine, the linear displacement element of the valve is acted upon by the vehicle electrics or electronics with such a control current that - depending on the engine parameters - a desired camshaft adjustment or adjustment of the gas exchange valves is accomplished.
Zur Steuerung der Bewegung wird also mittels des Steuerventils Hydraulikfluid gemäß den Bedürfnissen in die Hydraulikkammern geleitet. Das unter Druck stehende Hydrauliköl wird dabei von einer Hydraulikpumpe über den Zylinderkopf und über den Bereich des Nockenwellenlagers über den genannten Fluid- kanal in die Hydraulikkammern geleitet.  To control the movement of hydraulic fluid is thus conducted by means of the control valve according to the needs in the hydraulic chambers. The pressurized hydraulic oil is guided by a hydraulic pump via the cylinder head and over the area of the camshaft bearing via said fluid channel into the hydraulic chambers.
Als nachteilig hat sich folgender Umstand herausgestellt: Um die fluidische Verbindung zwischen der Hydraulikpumpe und dem Steuerventil herzustellen, werden gemäß dem Stand der Technik in die Nockenwelle im Bereich des No- ckenwellenlagers eine Eindrehung sowie Durchgangsbohrungen eingebracht, über die das Druckfluid geleitet wird. Sowohl die Eindrehung als auch die Bohrungen schwächen die Nockenwelle. Weiterhin ist das Einbringen von Eindrehung und Durchgangsbohrungen aufwändig und führt zu entsprechenden Be- arbeitungskosten. Ferner muss bei der bisher bekannten Konzeption die Nockenwelle als Vollwelle ausgebildet sein, was entsprechend nachteilige Folgen hinsichtlich des Gewichts der Nockenwelle hat. Aufgabe der Erfindung The following circumstance has proved to be disadvantageous: In order to establish the fluidic connection between the hydraulic pump and the control valve, according to the prior art, a recess and through-bores are introduced into the camshaft in the area of the camshaft bearing over which the pressurized fluid is passed. Both the recess and the holes weaken the camshaft. Furthermore, the introduction of recess and through holes is complex and leads to corresponding processing costs. Furthermore, in the previously known concept, the camshaft must be designed as a solid shaft, which has correspondingly disadvantageous consequences with regard to the weight of the camshaft. Object of the invention
Der vorliegenden Erfindung liegt die A u fg a b e zugrunde, eine Nockenwellen- verstellanordnung der eingangs genannten Art so fortzubilden, dass es möglich ist, den Fluidkanal im Bereich des Nockenwellenlagers und dessen Anbindung an den weiteren Fluidweg so zu gestalten, dass die Fertigung der Anordnung einfacher und damit kostengünstiger wird. Weiterhin soll es vermieden werden, die Nockenwelle im Bereich ihrer Anbindung an den Nockenwellenversteller bearbeiten zu müssen, so dass deren mechanische Festigkeit geschwächt wird. Schließlich soll es auch möglich werden, auf eine Hohlwelle als Nocken- welle zurückgreifen zu können. The present invention is based on the A u fg abe, a camshaft adjusting arrangement of the type mentioned in such a way that it is possible to make the fluid channel in the region of the camshaft bearing and its connection to the further fluid path so that the production of the arrangement easier and thus cheaper. Furthermore, it should be avoided to edit the camshaft in the region of their connection to the camshaft adjuster, so that their mechanical strength is weakened. Finally, it should also be possible to be able to use a hollow shaft as the camshaft.
Zusammenfassung der Erfindung Summary of the invention
Die L ö s u n g dieser Aufgabe durch die Erfindung ist dadurch gekennzeichnet, dass der Fluidkanal einen Ringraum umfasst, der zwischen dem axialen Ende der zumindest abschnittsweise rohrformig ausgebildeten Nockenwelle, einem flanschartigen Abschnitt eines mit der Nockenwelle drehfest verbundenen Gehäuseelements, in das das Steuerventil eingebaut ist, einer radial innenliegenden Begrenzungsfläche des Gehäuseelements und einem Abschnitt der Wan- dung des Nockenwellenlagers gebildet wird. The solution to this problem by the invention is characterized in that the fluid channel comprises an annular space which is installed between the axial end of the at least partially rohrformig trained camshaft, a flange-like portion of a non-rotatably connected to the camshaft housing member in which the control valve is installed, a radially inner boundary surface of the housing member and a portion of the wall of the camshaft bearing is formed.
Der Ringraum ist dabei bevorzugt im Radialschnitt rechteckförmig ausgebildet. The annular space is preferably formed rectangular in radial section.
Das Steuerventil kann eine Zentralschraube umfassen, mit der es in dem Ge- häuseelement koaxial zur Nockenwelle festgelegt ist. The control valve may comprise a central screw with which it is fixed in the housing element coaxial with the camshaft.
Die Nockenwelle ist bevorzugt direkt an dem Gehäuseelement befestigt. Die Befestigung der Nockenwelle an dem Gehäuseelement erfolgt dabei bevorzugt durch eine Presspassung zwischen einem innenzylindrischen Abschnitt der Nockenwelle und einem zylindrischen Abschnitt des Gehäuseelements. Die Befestigung kann auch durch eine stoffschlüssige Verbindung erfolgen; diese kann als Verlötung, insbesondere als Hartverlötung, oder als Verschweißung, insbesondere als Laserstrahl- oder Elektronenstrahlverschweißung, ausgebildet sein. The camshaft is preferably fastened directly to the housing element. The attachment of the camshaft to the housing element is preferably carried out by an interference fit between an inner cylindrical portion of the camshaft and a cylindrical portion of the housing member. The attachment can also be done by a cohesive connection; this can be formed as a soldering, in particular as Hartverlötung, or as a weld, in particular as a laser beam or electron beam welding.
Das Gehäuseelement kann weiterhin eine axiale Anlagefläche für das axiale Ende der Nockenwelle aufweisen, um für die Nockenwelle eine definierte axiale Endposition relativ zum Gehäuseelement zu definieren. The housing member may further include an axial abutment surface for the axial end of the camshaft to define a defined axial end position relative to the housing member for the camshaft.
Der flanschartige Abschnitt des Gehäuseelements bildet indes vorzugsweise eine axiale Lagerfläche für das Nockenwellenlager, wodurch auch für die Nockenwelle eine axiale Lagerfunktion geschaffen wird. The flange-like portion of the housing member, however, preferably forms an axial bearing surface for the camshaft bearing, whereby an axial bearing function is also provided for the camshaft.
Der Fluidkanal für das Druckfluid umfasst bevorzugt mehrere Bohrungen, die das Gehäuseelement durchsetzen, wobei die Bohrungen vorzugsweise unter einem Winkel zwischen 30° und 60° zur Achse der Nockenwelle angeordnet sind. The fluid channel for the pressure fluid preferably comprises a plurality of bores which pass through the housing element, wherein the bores are preferably arranged at an angle between 30 ° and 60 ° to the axis of the camshaft.
Mit der vorgeschlagenen Ausbildung des Nockenwellenverstellers kann bei Einsatz eines Zentralventils zur Steuerung des Druckfluids erreicht werden, dass als Grundkörper für die Nockenwelle zumindest abschnittsweise ein Rohr eingesetzt werden kann, was entsprechende Gewichtsvorteile bietet. With the proposed design of the camshaft adjuster can be achieved when using a central valve for controlling the pressurized fluid that at least partially a tube can be used as the base body for the camshaft, which offers corresponding weight advantages.
Weiterhin kann auf eine mechanische Bearbeitung im Endbereich der Nockenwelle im Bereich des Nockenwellenlagers verzichtet werden, so dass nicht nur diesbezügliche Bearbeitungskosten nicht anfallen, sondern auch die mechanische Festigkeit der Nockenwelle erhalten bleibt. Kurze Beschreibung der Figuren Furthermore, it is possible to dispense with a mechanical processing in the end region of the camshaft in the region of the camshaft bearing, so that not only does this not involve processing costs, but also the mechanical strength of the camshaft is maintained. Brief description of the figures
In den Zeichnungen sind Ausführungsbeispiele der Erfindung dargestellt. Es zeigen: In the drawings, embodiments of the invention are shown. Show it:
Fig. 1 den Radialschnitt durch eine Nockenwellenverstellanordnung eines Fig. 1 shows the radial section through a Nockenwellenverstellanordnung a
Verbrennungsmotors mit einer ansatzweise dargestellten Nockenwelle gemäß einer ersten Ausführungsform der Erfindung, Fig. 2 in der Darstellung gemäß Fig. 1 eine alternative Ausführungsform der Nockenwellenverstellanordnung gemäß einer zweiten Ausführungsform der Erfindung,  2 shows an illustration of an alternative embodiment of the camshaft adjusting arrangement according to a second embodiment of the invention, FIG. 2 is an illustration of an alternative embodiment of the camshaft adjusting arrangement according to a first embodiment of the invention;
Fig. 3 in der Darstellung gemäß Fig. 1 eine weitere alternative Ausfüh- rungsform der Nockenwellenverstellanordnung gemäß einer drittenFIG. 3 in the representation according to FIG. 1 shows a further alternative embodiment of the camshaft adjusting arrangement according to a third embodiment
Ausführungsform der Erfindung, Embodiment of the invention,
Fig. 4 in der Darstellung gemäß Fig. 1 eine weitere alternative Ausführungsform der Nockenwellenverstellanordnung gemäß einer vierten Ausführungsform der Erfindung und Fig. 4 in the illustration of FIG. 1, a further alternative embodiment of the camshaft adjusting arrangement according to a fourth embodiment of the invention and
Fig. 5 den Bereich des Steuerventils samt Nockenwellenansatz und Nockenwellenlager in vergrößerter Darstellung. Ausführliche Beschreibung der Figuren Fig. 5 shows the area of the control valve including camshaft approach and camshaft bearing in an enlarged view. Detailed description of the figures
In den Figuren 1 bis 4 sind vier Ausführungsbeispiele der erfindungsgemäßen Nockenwellenverstellanordnung 1 einer Brennkraftmaschine dargestellt, die sich letztlich nur in der Art und Weise unterscheiden, wie ein Steuerventil 4 betätigt wird, das benötigt wird, um gezielt Druckfluid in (nicht dargestellte) Hydraulikkammern zu leiten, um eine Nockenwellenverstellung in bekannter Weise vorzunehmen. Der prinzipielle Aufbau und die Funktionsweise entspre- chen der DE 10 2005 052 481 A1 der Anmelderin, auf die insoweit vollumfäng- lich Bezug genommen wird. Four embodiments of the camshaft adjusting arrangement 1 of an internal combustion engine according to the invention are shown in FIGS. 1 to 4, which ultimately differ only in the manner in which a control valve 4 is actuated in order to selectively direct pressurized fluid into hydraulic chambers (not shown) to make a camshaft adjustment in a known manner. The basic structure and functioning correspond to DE 10 2005 052 481 A1 of the Applicant, to which reference is made in this respect in its entirety.
Hiernach weist die Nockenwellenverstellanordnung 1 über ein (nicht dargestell- tes) Triebelement - zumeist eine Kette oder ein Zahnriemen - ein Antriebselement 3 auf, das ausgebildet ist, eine gezielte Verdrehung um einen definierten relativen Verdrehwinkel zwischen der Kurbelwelle der Brennkraftmaschine und einer Nockenwelle 2 auszuführen, um in bekannter Weise das Betriebsverhalten der Brennkraftmaschine zu beeinflussen. Der Strom von unter Druck ste- hendem Hydraulikfluid in die Hydraulikkammern wird durch ein Steuerventil 4 bewerkstelligt, das von einer Stelleinheit 20 betätigt wird, indem es in axiale Richtung (entsprechend der Achsrichtung der Nockenwelle 2) gegen die Wirkung einer Feder verschoben wird. Das Steuerventil 4 besteht aus einem Druckmittelleiteinsatz 21 (s. hierzu die Detailansicht gemäß Fig. 5), das in einem Steuerventil 22 axial verschieblich sitzt. Das Steuerventil 22 wiederum ist fest in einem Gehäuseelement 12 angeordnet, das als Adapter fungiert. Hierzu weist das Steuerventil 22 eine Zentralschraube 15 auf, die in ein Gewinde im Gehäuseelement 12 eingeschraubt ist. Hereinafter, the camshaft adjusting arrangement 1 via a (not shown) drive element - usually a chain or a toothed belt - a drive element 3, which is designed to perform a targeted rotation by a defined relative angle of rotation between the crankshaft of the internal combustion engine and a camshaft 2, to influence the operating behavior of the internal combustion engine in a known manner. The flow of pressurized hydraulic fluid into the hydraulic chambers is accomplished by a control valve 4 actuated by an actuator 20 by being displaced in the axial direction (corresponding to the axial direction of the camshaft 2) against the action of a spring. The control valve 4 consists of a pressure fluid feed insert 21 (see the detailed view according to FIG. 5), which is seated axially displaceably in a control valve 22. The control valve 22 in turn is fixedly arranged in a housing element 12, which acts as an adapter. For this purpose, the control valve 22 has a central screw 15 which is screwed into a thread in the housing element 12.
Zur Arbeitsweise der Nockenwellenverstellanordnung 1 wird wiederum auf die DE 10 2005 052 481 A1 Bezug genommen. For the operation of the camshaft adjusting arrangement 1, reference is again made to DE 10 2005 052 481 A1.
Wesentlich ist, dass das Druckfluid zur Betätigung der Nockenwellenverstell- anordnung 1 von einer - nicht dargestellten - Pumpe über den Bereich eines Nockenwellenlagers 5 zum Druckmittelleiteinsatz 21 geleitet werden muss. Das Nockenwellenlager 5 lagert die Nockenwelle 2, so dass diese relativ zum Nockenwellenlager 5 und somit auch zum Antriebselement 3 verdrehbar ist. Für die Leitung des Druckfluids ist ein Fluidkanal vorgesehen, der die Abschnitte 6, 7, 8 und 9 aufweist. Der Abschnitt 7 besteht aus mehreren, z. B. drei oder vier, Bohrungen die unter einem Winkel zur Achse der Nockenwelle 2 in das Gehäuseelement 12 eingebracht sind. Dann wird ein Ringraum 9 zwischen dem Gehäuseelement 12 und dem Steuerventil 22 ausgebildet, über den das Fluid weitergeführt wird. In das Steuerventil 22 sind dann Querbohrungen 9 eingebracht, über die das Druckfluid zum Druckmittelleiteinsatz 21 gelangt. Vorliegend ist die Ausbildung des ersten Fluidkanals 6 entscheidend, der die Verbindung zwischen einer (nicht dargestellten) Druckleitung, die mit der Flu- idpumpe verbunden ist, und dem Fluidkanal 7 herstellt. It is essential that the pressurized fluid for actuating the camshaft adjusting arrangement 1 must be led by a pump (not shown) over the area of a camshaft bearing 5 to the pressurized medium insert 21. The camshaft bearing 5 supports the camshaft 2, so that it is rotatable relative to the camshaft bearing 5 and thus also to the drive element 3. For the line of the pressurized fluid, a fluid channel is provided which has the sections 6, 7, 8 and 9. The section 7 consists of several, z. B. three or four, holes are introduced at an angle to the axis of the camshaft 2 in the housing member 12. Then an annular space 9 between formed the housing member 12 and the control valve 22, via which the fluid is continued. In the control valve 22 then transverse bores 9 are introduced, via which the pressure fluid passes to the Druckmittelleiteinsatz 21. In the present case, the design of the first fluid channel 6 is decisive, which establishes the connection between a pressure line (not shown), which is connected to the fluid pump, and the fluid channel 7.
Der Ringraum 6 ist so ausgebildet, dass zu seiner Ausbildung die Nockenwelle 2 nicht mechanisch bearbeitet und hierdurch geschwächt werden muss. Die Nockenwelle 2 ist vorliegend als Rohr ausgeführt, das ein axiales Ende 10 aufweist. Das Gehäuseelement 12 hat in seinem (rechten) axialen Endbereich einen zylindrischen Abschnitt 17, der an einer Stufung eine axiale Anlagefläche 18 für das Ende 10 der Nockenwelle 2 bildet. Die Nockenwelle 2 wiederum hat einen innenzylindrischen Abschnitt 16, der auf den zylindrischen Abschnitt 17 aufgeschoben ist, bis das Ende 10 der Nockenwelle 2 an der axialen Anlagefläche 18 anliegt. The annular space 6 is formed so that the camshaft 2 is not mechanically processed and thus weakened to its formation. The camshaft 2 is in the present case designed as a tube having an axial end 10. The housing member 12 has in its (right) axial end portion of a cylindrical portion 17 which forms an axial abutment surface 18 for the end 10 of the camshaft 2 at a gradation. The camshaft 2 in turn has an inner cylindrical portion 16 which is pushed onto the cylindrical portion 17 until the end 10 of the camshaft 2 abuts the axial abutment surface 18.
Dabei sind das Gehäuseelement 12 und die Nockenwelle 2 bleibend verbun- den, beispielsweise durch eine Verschweißung oder Verlötung. Weiterhin kann alternativ oder additiv vorgesehen sein, dass zwischen dem zylindrischen Abschnitt 17 des Gehäuseelements 2 und dem innenzylindrischen Abschnitt 16 der Nockenwelle 2 Presspassung vorliegt, so dass hierdurch der feste Verbund zwischen Nockenwelle 2 und Gehäuseelement 12 hergestellt wird. Möglich wäre auch eine formschlüssige Verbindung (z. B. mittels Gewinde) zwischen Gehäuseelement 12 und Nockenwelle 2. In this case, the housing element 12 and the camshaft 2 are permanently connected, for example by welding or soldering. Furthermore, it can be alternatively or additionally provided that between the cylindrical portion 17 of the housing member 2 and the inner cylindrical portion 16 of the camshaft 2 is press-fitted, so that in this way the solid bond between the camshaft 2 and housing member 12 is produced. A positive connection (eg by means of a thread) between housing element 12 and camshaft 2 would also be possible.
Das Gehäuseelement 12 hat weiterhin einen flanschartigen Abschnitt 1 1 mit einer sich radial erstreckenden Seitenfläche, die gleichzeitig eine axiale Lager- fläche bzw. Anlauffläche 19 für das Nockenwellenlager 5 bildet. Die beiden radial verlaufenden Flächen, die durch das axiale Ende 10 der Nockenwelle 2 sowie durch die axiale Lagerfläche 19 am Gehäuseelement 12 gebildet wer- den, bilden die seitlichen Begrenzungsflächen des ringraumförmigen Fluidka- nals 6. The housing element 12 further has a flange-like portion 11 having a radially extending side surface which simultaneously forms an axial bearing surface or contact surface 19 for the camshaft bearing 5. The two radially extending surfaces which are formed by the axial end 10 of the camshaft 2 and by the axial bearing surface 19 on the housing element 12 den, form the lateral boundary surfaces of the annular space-shaped Fluidka- channel. 6
Dessen radiale Begrenzungsflächen werden durch eine radial innenliegende zylindrische Begrenzungsfläche 13 gebildet, die im Außenumfang des Gehäuseelements 12 ausgebildet ist, sowie durch einen zylindrischen Teil der Wandung 14 des Nockenwellenlagers 5. Its radial boundary surfaces are formed by a radially inner cylindrical boundary surface 13, which is formed in the outer periphery of the housing member 12, and by a cylindrical part of the wall 14 of the camshaft bearing fifth
Demgemäß ist vorliegend ein Ringraum 6 als Fluidkanal ausgebildet, der im Radialschnitt eine rechteckige Form aufweist. Accordingly, in the present case, an annular space 6 is formed as a fluid channel, which has a rectangular shape in the radial section.
Der Vorteil dieser Ausgestaltung ist zum einen, dass problemlos ein Rohr als Nockenwelle 2 eingesetzt werden kann, da der Anschluss an das Gehäuseelement 12 wie erläutert platzsparend und vorteilhaft erfolgen kann. Weiterhin muss die Nockenwelle 2 selber nicht mechanisch bearbeitet werden, um den Fluidkanal 6 zu schaffen. Im Stand der Technik war es bislang erforderlich, dass in die Nockenwelle hierzu Ausnehmungen eingearbeitet werden mussten, was nicht nur einen entsprechenden Fertigungsaufwand erfordert, sondern auch eine mechanische Schwächung der Nockenwelle 2 nach sich zieht. The advantage of this embodiment is, on the one hand, that a tube can be used without problems as a camshaft 2, since the connection to the housing element 12, as explained, can be space-saving and advantageous. Furthermore, the camshaft 2 itself does not have to be machined to create the fluid channel 6. In the prior art, it has hitherto been necessary for recesses to be incorporated into the camshaft, which not only requires a corresponding production outlay, but also entails a mechanical weakening of the camshaft 2.
Bezugszeichenliste LIST OF REFERENCE NUMBERS
Nockenwellenverstellanordnung Camshaft adjustment arrangement
2 Nockenwelle  2 camshaft
3 Antriebselement 3 drive element
4 Steuerventil  4 control valve
5 Nockenwellenlager  5 camshaft bearings
6 Fluidkanal  6 fluid channel
7 Fluidkanal  7 fluid channel
8 Fluidkanal 8 fluid channel
9 Fluidkanal  9 fluid channel
10 axiales Ende der Nockenwelle  10 axial end of the camshaft
1 1 flanschartiger Abschnitt  1 1 flange-like section
12 Gehäuseelement  12 housing element
13 radial innenliegende Begrenzungsfläche 13 radially inner boundary surface
14 Abschnitt der Wandung des Nockenwellenlagers 14 Section of the wall of the camshaft bearing
15 Zentralschraube 15 central screw
16 innenzylindrischer Abschnitt der Nockenwelle 16 inner cylindrical portion of the camshaft
17 zylindrischer Abschnitt des Gehäuseelements 18 axiale Anlagefläche 17 cylindrical portion of the housing member 18 axial abutment surface
19 axiale Lagerfläche für das Nockenwellenlager 19 axial bearing surface for the camshaft bearing
20 Stelleinheit 20 control unit
21 Druckmittelleiteinsatz  21 hydraulic fluid insert
22 Steuerventil  22 control valve

Claims

Patentansprüche claims
Nockenwellenverstellanordnung (1 ) zur Veränderung der relativen Winkellage einer Nockenwelle (2) gegenüber einer Kurbelwelle einer Brenn- kraftmaschine, wobei die Nockenwellenverstellanordnung (1 ) ein von der Kurbelwelle angetriebenes Anthebselement (3) umfasst, das gegenüber der Nockenwelle (2) drehbar gelagert ist, wobei zwischen dem Antriebselement (3) und der Nockenwelle (2) mindestens zwei Hydraulikkammern ausgebildet sind, die mit einem Druckfluid beaufschlagbar sind, um eine definierte relative Drehstellung zwischen dem Antriebselement (3) und der Nockenwelle (2) einzustellen, wobei zur Steuerung des Flusses des Druckfluids in die Hydraulikkammern ein Steuerventil (4) vorgesehen ist, wobei das Steuerventil (4) von dem Bereich eines Nockenwellenlagers (5) aus über einen Fluidkanal (6, 7, 8, 9) mit Druckfluid versorgt wird, dadurch gekennzeichnet, dass der Fluidkanal (6, 7, 8, 9) einen Ringraum (6) umfasst, der zwischen dem axialen Ende (10) der zumindest abschnittsweise rohrförmig ausgebildeten Nockenwelle (2), einem flanschartigen Abschnitt (1 1 ) eines mit der Nockenwelle (2) drehfest verbundenen Gehäuseelements (12), in das das Steuerventil (4) eingebaut ist, einer radial innenliegenden Begrenzungsfläche (13) des Gehäuseelements (12) und einem Abschnitt (14) der Wandung des Nockenwellenlagers (5) gebildet wird. Nockenwellenverstellanordnung nach Anspruch 1 , dadurch gekennzeichnet, dass der Ringraum (6) im Radialschnitt rechteckförmig ausgebildet ist. Camshaft adjusting arrangement (1) for changing the relative angular position of a camshaft (2) relative to a crankshaft of an internal combustion engine, wherein the camshaft adjusting arrangement (1) comprises a crankshaft driven Anthebselement (3) which is rotatably mounted relative to the camshaft (2), wherein between the drive element (3) and the camshaft (2) at least two hydraulic chambers are formed, which are acted upon by a pressurized fluid to set a defined relative rotational position between the drive element (3) and the camshaft (2), wherein for controlling the flow of the pressure fluid in the hydraulic chambers a control valve (4) is provided, wherein the control valve (4) from the region of a camshaft bearing (5) via a fluid channel (6, 7, 8, 9) is supplied with pressurized fluid, characterized in that the Fluid channel (6, 7, 8, 9) comprises an annular space (6) between the axial end (10) of the at least partially raw R-shaped camshaft (2), a flange-like portion (1 1) of a with the camshaft (2) rotatably connected housing member (12) into which the control valve (4) is installed, a radially inner boundary surface (13) of the housing element (12) and a portion (14) of the wall of the camshaft bearing (5) is formed. Camshaft adjusting arrangement according to claim 1, characterized in that the annular space (6) is rectangular in radial section.
Nockenwellenverstellanordnung nach Anspruch 1 , dadurch gekennzeichnet, dass das Steuerventil (4) eine Zentralschraube (15) umfasst, mit der es in dem Gehäuseelement (12) koaxial zur Nockenwelle (2) festgelegt ist. Camshaft adjusting arrangement according to claim 1, characterized in that the control valve (4) comprises a central screw (15) with which it is fixed in the housing element (12) coaxial with the camshaft (2).
Nockenwellenverstellanordnung nach Anspruch 1 , dadurch gekennzeichnet, dass die Nockenwelle (2) an dem Gehäuseelement (12) befestigt ist. Camshaft adjusting arrangement according to claim 1, characterized in that the camshaft (2) is fixed to the housing element (12).
Nockenwellenverstellanordnung nach Anspruch 4, dadurch gekennzeichnet, dass die Befestigung der Nockenwelle (2) an dem Gehäuseelement (12) durch eine Presspassung zwischen einem innenzylindrischen Abschnitt (16) der Nockenwelle (2) und einem zylindrischen Abschnitt (17) des Gehäuseelements (12) ausgebildet ist. Camshaft adjusting arrangement according to claim 4, characterized in that the attachment of the camshaft (2) to the housing element (12) formed by an interference fit between an inner cylindrical portion (16) of the camshaft (2) and a cylindrical portion (17) of the housing member (12) is.
Nockenwellenverstellanordnung nach Anspruch 4, dadurch gekennzeichnet, dass die Befestigung der Nockenwelle (2) an dem Gehäuseelement (12) durch eine stoffschlüssige Verbindung ausgebildet ist. Camshaft adjusting arrangement according to claim 4, characterized in that the attachment of the camshaft (2) on the housing element (12) is formed by a material connection.
Nockenwellenverstellanordnung nach Anspruch 6, dadurch gekennzeichnet, dass die stoffschlüssige Verbindung als Verlötung, insbesondere als Hartverlötung, oder als Verschweißung, insbesondere als Laserstrahl- oder Elektronenstrahlverschweißung, ausgebildet ist. Camshaft adjusting arrangement according to claim 6, characterized in that the cohesive connection as a soldering, in particular as Hartverlötung, or as a weld, in particular as a laser beam or electron beam welding, is formed.
Nockenwellenverstellanordnung nach Anspruch 1 , dadurch gekennzeichnet, dass das Gehäuseelement (12) eine axiale Anlagefläche (18) für das axiale Ende (10) der Nockenwelle (2) aufweist. Nockenwellenverstellanordnung nach Anspruch 1 , dadurch gekennzeichnet, dass der flanschartige Abschnitt (1 1 ) des Gehauseelements (12) eine axiale Lagerfläche (19) für das Nockenwellenlager (5) bildet. Camshaft adjusting arrangement according to claim 1, characterized in that the housing element (12) has an axial abutment surface (18) for the axial end (10) of the camshaft (2). Camshaft adjusting arrangement according to claim 1, characterized in that the flange-like portion (1 1) of the housing element (12) forms an axial bearing surface (19) for the camshaft bearing (5).
Nockenwellenverstellanordnung nach Anspruch 1 , dadurch gekennzeichnet, dass der Fluidkanal (6, 7, 8, 9) für das Druckfluid mehrere Bohrungen (7) umfasst, die das Gehäuseelement (12) durchsetzen, wobei die Bohrungen (7) vorzugsweise unter einem Winkel zwischen 30° und 60° zur Achse der Nockenwelle (2) angeordnet sind. Camshaft adjusting arrangement according to claim 1, characterized in that the fluid channel (6, 7, 8, 9) for the pressurized fluid comprises a plurality of bores (7) which pass through the housing element (12), the bores (7) preferably at an angle between 30 ° and 60 ° to the axis of the camshaft (2) are arranged.
EP10771733.2A 2009-10-31 2010-10-28 Camshaft adjusting assembly Active EP2494157B1 (en)

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DE102009051519A DE102009051519A1 (en) 2009-10-31 2009-10-31 Camshaft adjustment arrangement
PCT/EP2010/066329 WO2011051377A1 (en) 2009-10-31 2010-10-28 Camshaft adjusting assembly

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CN (1) CN102686837B (en)
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DE102012208809B4 (en) * 2012-05-25 2020-11-26 Schaeffler Technologies AG & Co. KG Control valve of a camshaft adjuster
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CN102686837A (en) 2012-09-19
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CN102686837B (en) 2015-04-29
US20120210963A1 (en) 2012-08-23
WO2011051377A1 (en) 2011-05-05
US8776744B2 (en) 2014-07-15

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