EP2742215A1 - Cam element for a valve-gear device - Google Patents

Cam element for a valve-gear device

Info

Publication number
EP2742215A1
EP2742215A1 EP12740052.1A EP12740052A EP2742215A1 EP 2742215 A1 EP2742215 A1 EP 2742215A1 EP 12740052 A EP12740052 A EP 12740052A EP 2742215 A1 EP2742215 A1 EP 2742215A1
Authority
EP
European Patent Office
Prior art keywords
cam
partial cams
undercut
partial
cams
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
EP12740052.1A
Other languages
German (de)
French (fr)
Other versions
EP2742215B1 (en
Inventor
Michael KUJAS
Thomas Stolk
Alexander Von Gaisberg-Helfenberg
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.)
Mercedes Benz Group AG
Original Assignee
Daimler AG
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 Daimler AG filed Critical Daimler AG
Publication of EP2742215A1 publication Critical patent/EP2742215A1/en
Application granted granted Critical
Publication of EP2742215B1 publication Critical patent/EP2742215B1/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
    • 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
    • F01L1/08—Shape of cams
    • 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
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • 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
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0036—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
    • 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
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0036—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
    • F01L2013/0052—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction with cams provided on an axially slidable sleeve
    • 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
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49293—Camshaft making

Definitions

  • the invention relates to a cam element for a valve drive device according to the preamble of claim 1.
  • DE 10 2008 050 776 A1 already has a cam element for a valve drive device of an internal combustion engine, having at least one cam which has at least two adjacently arranged partial cams which have a common base circle phase in at least one camshaft angle region and for valve lift switching by displacing a cam follower from one of the partial cams to another of the partial cams are known.
  • the invention is in particular the object of further increasing the efficiency of an internal combustion engine. It is achieved according to the invention by the features of claim 1. Further embodiments emerge from the subclaims.
  • the invention is based on a cam element for a valve drive device of an internal combustion engine having at least one cam which has at least two partial cams arranged side by side, which have a common base circle phase in at least one camshaft angle region and for valve lift switching by shifting a cam follower from one of the partial cams to another the partial cams are provided.
  • the partial cams have an overlapping arrangement.
  • a valve lift and a valve opening duration can advantageously be tuned to a combustion process in a cylinder, as a result of which the combustion process can be thermodynamically improved.
  • an improvement in terms of consumption and with regard to combustion residues can be achieved, as a result of which an efficiency of an internal combustion engine is increased can.
  • a "cam element” should be understood as meaning, in particular, a part of a camshaft which forms a cam for actuating a gas exchange valve.
  • a cam with juxtaposed partial cams is to be understood in particular as a cam which has two partial cams arranged side by side in the axial direction are provided to actuate the same gas exchange valve differently in different discrete switching positions of the cam member.
  • An operating characteristic of the gas exchange valve is defined by the individual part cam.
  • a “displacement of a cam follower” is to be understood in particular as meaning that a single cam follower, which is provided for picking up a cam contour of the partial cams and for actuating the gas exchange valve, and the partial cams are displaced relative to one another along an axis of rotation of the cam element, wherein the relative Displacement can be effected both by axial movement of the cam element with simultaneous axial fixation of the cam follower or by axial movement of the cam follower with simultaneous axial fixation of the cam element
  • An “overlapping arrangement” is to be understood in particular as meaning that the partial cams are only partially superimposed, ie that in any cross sections of a partial cam the other partial cam only partially obscured. In particular, it should be understood that none of the sub-cams spans an envelope in the radial direction, within which the second sub-cam is completely arranged.
  • “Provided” is to be understood in particular to be specially equipped and / or designed.
  • the cam element has an undercut which is introduced between the two partial cams.
  • Under a "undercut” is in particular a removal of a rotationally symmetrical inner edge with a certain shape and specified dimensions, which gives both the tool used in the production and the adjoining part during assembly the necessary space to be understood, preferably in accordance with DIN 509th Unter “Between” should be understood in this context, in particular, that the undercut is arranged along the axis of rotation spatially between the sub-cam.
  • production axis is to be understood here as meaning, in particular, a virtual axis, with respect to which the undercut has symmetry, in particular rotational symmetry, at least in partial regions the axis of rotation is displaced, preferably in a direction corresponding to a pressure or counter-pressure side of one of the partial cams.
  • the undercut has a truncated cone shape.
  • a "truncated cone” is understood in particular to mean a shape which corresponds at least substantially to a truncated cone, for example in a longitudinal section through the cam element, wherein the undercut may have a rounded shape relative to a geometrically ideal truncated cone, in particular at edges
  • a section are understood, the cutting plane through the axis of rotation or axially parallel to the axis of rotation.
  • the undercut at least in the base circle phase merges into the partial cams at a shallow angle.
  • a switchability of the cam follower can be advantageously obtained.
  • a “shallow angle” is to be understood in particular as meaning that an angle which includes a running surface of the cam follower with a surface of the undercut, at least in a transition region between the tread and the undercut is less than 45 °, preferably less than 40 ° and especially is advantageously less than 35 °.
  • valve drive device with a cam element according to the invention and a Ventilhubumschaltü, which is intended to move the cam member along its axis of rotation proposed.
  • a structurally simple valve drive device can be provided with a high efficiency.
  • a method for producing a cam element for a valve drive device of an internal combustion engine with at least one cam having at least two adjacent partial cam having a common Grund Vietnamesephase in at least one Nockenwellenwin- kel Colour and for a Ventilhubumschal- device by shifting a cam follower of a the partial cams are provided on another of the partial cams, in particular a method for manufacturing a cam element according to the invention, proposed in which between the two partial cams an undercut is introduced. As a result, the cam element can be manufactured particularly easily.
  • the partial cams are individually formed after insertion of the undercut.
  • each partial cam can be provided with an individual contour.
  • "individual” should be understood in particular to mean that a production step in which the running surfaces of the two partial cams are processed simultaneously is dispensed with.
  • FIG. 1 is a perspective view of a valve drive device with a cam element according to the invention
  • Figures 1 to 3 show schematically an internal combustion engine valve drive device with a cam element 17 according to the invention.
  • the internal combustion engine valve drive device is provided for an internal combustion engine having at least two cylinders arranged in series, which have different valve actuation times.
  • the engine valve driving apparatus is also applicable to an internal combustion engine in which three, four or more cylinders are arranged in one row, such as a four-cylinder inline engine or a six-cylinder V-engine.
  • the internal combustion engine valve drive device comprises a camshaft 18 with the cam element 17 and a further cam element, which is designed analogously.
  • the cam member 17 is formed as a cam carrier. On the cam elements 17, a cam 10 is arranged, which has two partial cams 11, 12 with different cam contour. The cam member 17 has still more cams, which are formed analogously. The partial cams 11, 12 of the cam 10 are arranged immediately adjacent.
  • the cam member 17 is axially displaceable. By an axial displacement of the cam member 17 is switched within the cam 10 of the one part cam 11, 12 on the other part cam 11, 12.
  • the cam member 17 thus has two discrete switching positions, in which a different valve lift is connected for the cylinder or cylinders associated with the cam element 17.
  • the camshaft 18 comprises a drive shaft 19.
  • the drive shaft 19 comprises a crankshaft connection for connection to a crankshaft, not shown.
  • the crankshaft connection can be formed by means of a camshaft adjuster which is provided to set a phase position between the camshaft 18 and the crankshaft.
  • the cam member 17 is axially displaceable and non-rotatably mounted on the drive shaft 19.
  • the drive shaft 19 has a straight toothing on its outer periphery.
  • the cam member 17 has on its inner circumference a corresponding spur toothing, which engages in the spur toothing of the drive shaft 19.
  • the engine valve drive device comprises a shift gate 20.
  • the shift gate 20 is provided to sequentially shift the cam element 17 and the further cam element in a switching operation.
  • the shift gate 20 includes two slide tracks.
  • the first slide track is provided to displace the cam element 17 and the second cam element along a first shift direction from the first shift position to the second shift position.
  • the second slide track is provided to shift the cam element 17 and the second cam element along a second shift direction from the second shift position to the first shift position (cf., FIG. 1).
  • the internal combustion engine valve drive device comprises a switching unit 21, which has two switching pins for engagement in the slide tracks.
  • the switching unit 21 has a stator housing which is fixedly connected to an engine block of the internal combustion engine.
  • the switching pins are slidably disposed in the stator housing along their main extension direction.
  • the slide tracks are designed as grooves in which the switching pins can be forcibly guided on both sides. In a switching operation in the first switching direction, the first switching pin is brought into engagement with the first slide track. In a switching operation in the second switching direction of the second switching pin is brought into engagement with the second slide track.
  • the slide tracks have at least in some areas an axial inclination.
  • rotation of the cam member 17 about its rotational axis 16 causes the shift pin to exert on the cam member 17 an axially acting force that causes the cam member 17 to move along the rotational axis 16.
  • a cam follower to the tap the cam contour is provided, is thereby shifted from the one part cam 11, 12 on the other part cam 11, 12.
  • the cam follower is axially fixed and the cam member 17 is arranged axially displaceable. In principle, however, it is also conceivable to make the cam element 17 axially fixed and the cam follower axially displaceable.
  • the two sub-cams 11, 12 have in a camshaft angle range 13 common base circle phase.
  • the cam follower is shifted from the one part cam 11, 12 on the other part cam 11, 12.
  • the two partial cams 11, 12 with respect to the axis of rotation 16 of the cam member 17 on a substantially same radial extent.
  • the partial cams 11, 12 of the cam 10 have an overlapping arrangement.
  • the first part cam 11 has a radial extension which is greater than a radial extent that the second part cam 12 has in this camshaft angle region 22.
  • a valve lift provided by the first part cam 11 is greater than a valve lift provided by the second part cam 11.
  • the second part cam 12 has a radial extension that is greater than a radial extent that the first part cam 11 has in this camshaft angle region 23.
  • a valve lift provided by the second part cam 12 is greater than a valve lift provided by the first part cam 11.
  • the second part cam 12 is thus not completely within a radial envelope, which is spanned by the first part cam 11.
  • the first part cam 11 is not in a radial envelope, which is spanned by the second part cam 12.
  • the cam member 17 has an undercut 14 which is introduced between the two partial cams 11, 12.
  • the undercut 14 is introduced into the cam element 17 by a machining process, in particular a milling and / or twisting method.
  • the undercut 14 extends over an entire outer circumference of the cam element 17. It is introduced into the outer circumference of the cam element 17 as an outer free groove.
  • the undercut 14 has a production axis 15, which is arranged offset from the axis of rotation 16 of the cam member 17.
  • the undercut 14 has a symmetry with respect to the production axis 15.
  • the undercut 14 is rotationally symmetrical with respect to the production axis 15, ie has a base circle in the camshaft angle range 23 of the base circle phase whose center lies on the production axis 15.
  • the cam member 17 is rotated about the production axis 15.
  • the production axis 15 is displaced axially parallel to the axis of rotation 16.
  • the undercut 14 has a truncated cone shape.
  • a surface of the cam member 17 extends parallel to the production axis 15.
  • the undercut 14 at the side in the base circle phase at a shallow angle at least in the base circle phase in the partial cams 11, 12, i. an angle which includes a provided for the cam follower tread of the partial cam 11, 12 with the surface in the region of the undercut 14 is always less than 45 °.
  • the angle is between 10 ° and 30 °.
  • the undercut 14 is first introduced between the two partial cams 11, 12.
  • the undercut 14 is introduced in a machining process.
  • the two partial cams 11, 12 are formed individually.
  • the partial cams 11, 12 are ground individually after introduction of the undercut 14 with grinding tools whose width is only slightly larger than a width of the individual partial cams 11, 12.
  • An order in which the partial cams 11, 12 are ground is arbitrary. LIST OF REFERENCE NUMBERS

Landscapes

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

Abstract

The invention is based on a cam element for a valve-gear device of an internal combustion engine, with at least one cam (10) which has at least two partial cams (11, 12) which are arranged next to one another, have a common base circle phase in at least one angular range (13) of the cam shaft and are provided for switching over a valve lift by displacing a cam follower from one of the partial cams (11, 12) to another of the partial cams (11, 12). It is proposed that the partial cams (11, 12) have an overlapping arrangement.

Description

Nockenelement für eine Ventiltriebvorrichtung  Cam element for a valve drive device
Die Erfindung betrifft ein Nockenelement für eine Ventiltriebvorrichtung nach dem Oberbegriff des Anspruchs 1. The invention relates to a cam element for a valve drive device according to the preamble of claim 1.
Aus der DE 10 2008 050 776 A1 ist bereits ein Nockenelement für eine Ventiltriebvorrichtung einer Brennkraftmaschine, mit zumindest einem Nocken, der zumindest zwei nebeneinander angeordnete Teilnocken aufweist, die in zumindest einem Nockenwellenwinkel- bereich eine gemeinsame Grundkreisphase aufweisen und für eine Ventilhubumschaltung durch Verschieben eines Nockenfoigers von einem der Teilnocken auf einen anderen der Teilnocken vorgesehen sind, bekannt. DE 10 2008 050 776 A1 already has a cam element for a valve drive device of an internal combustion engine, having at least one cam which has at least two adjacently arranged partial cams which have a common base circle phase in at least one camshaft angle region and for valve lift switching by displacing a cam follower from one of the partial cams to another of the partial cams are known.
Der Erfindung liegt insbesondere die Aufgabe zugrunde, eine Effizienz eines Verbrennungsmotors weiter zu steigern. Sie wird gemäß der Erfindung durch die Merkmale des Anspruchs 1 gelöst. Weitere Ausgestaltungen ergeben sich aus den Unteransprüchen. The invention is in particular the object of further increasing the efficiency of an internal combustion engine. It is achieved according to the invention by the features of claim 1. Further embodiments emerge from the subclaims.
Die Erfindung geht aus von einem Nockenelement für eine Ventiltriebvorrichtung einer Brennkraftmaschine, mit zumindest einem Nocken, der zumindest zwei nebeneinander angeordnete Teilnocken aufweist, die in zumindest einem Nockenwellenwinkelbereich eine gemeinsame Grundkreisphase aufweisen und für eine Ventilhubumschaltung durch Verschieben eines Nockenfoigers von einem der Teilnocken auf einen anderen der Teilnocken vorgesehen sind. The invention is based on a cam element for a valve drive device of an internal combustion engine having at least one cam which has at least two partial cams arranged side by side, which have a common base circle phase in at least one camshaft angle region and for valve lift switching by shifting a cam follower from one of the partial cams to another the partial cams are provided.
Es wird vorgeschlagen, dass die Teilnocken eine überlappende Anordnung aufweisen. Dadurch kann ein Ventilhub und eine Ventilöffnungsdauer vorteilhaft auf einen Verbren- nungsprozess in einem Zylinder abgestimmt werden, wodurch der Verbrennungsprozess thermodynamisch verbessert werden kann. Durch die überlappende Anordnung kann somit eine Verbesserung hinsichtlich Verbrauch und hinsichtlich Verbrennungsrückständen erreicht werden, wodurch eine Effizienz einer Brennkraftmaschine gesteigert werden kann. Unter einem„Nockenelement" soll insbesondere ein Teil einer Nockenwelle verstanden werden, das einen Nocken zur Betätigung eines Gaswechselventils ausbildet. Unter einem„Nocken mit nebeneinander angeordneten Teilnocken" soll insbesondere ein Nocken verstanden werden, der zwei in axialer Richtung nebeneinander angeordnete Teilnocken aufweist, die dazu vorgesehen sind, in unterschiedlichen diskreten Schaltstellungen des Nockenelements das gleiche Gaswechselventil unterschiedlich zu betätigen. Eine Betätigungscharakteristik des Gaswechselventils ist dabei durch die einzelnen Teilnocken definiert. Unter einem„Verschieben eines Nockenfolgers" soll dabei insbesondere verstanden werden, dass ein einzelner Nockenfolger, der zum Abgriff einer Nockenkontur der Teilnocken und für die Betätigung des Gaswechselventils vorgesehen ist, und der Teilnocken relativ zueinander entlang einer Rotationsachse des Nockenelements verschoben werden, wobei die relative Verschiebung sowohl durch eine axiale Bewegung des Nockenelements bei gleichzeitiger axialer Fixierung des Nockenfolgers oder durch eine axiale Bewegung des Nockenfolgers bei gleichzeitig axialer Fixierung des Nockenelements erfolgen kann. Unter einer„überlappenden Anordnung" soll insbesondere verstanden werden, dass die Teilnocken jeweils lediglich teilweise übereinanderliegen, d.h. dass in beliebigen Querschnitten der eine Teilnocken den anderen Teilnocken lediglich teilweise verdeckt. Insbesondere soll darunter verstanden werden, dass keiner der Teilnocken in radialer Richtung eine Hüllkurve aufspannt, innerhalb der der zweite Teilnocken vollständig angeordnet ist. Unter„vorgesehen" soll insbesondere speziell ausgestattet und/oder ausgelegt verstanden werden. It is proposed that the partial cams have an overlapping arrangement. As a result, a valve lift and a valve opening duration can advantageously be tuned to a combustion process in a cylinder, as a result of which the combustion process can be thermodynamically improved. As a result of the overlapping arrangement, an improvement in terms of consumption and with regard to combustion residues can be achieved, as a result of which an efficiency of an internal combustion engine is increased can. A "cam element" should be understood as meaning, in particular, a part of a camshaft which forms a cam for actuating a gas exchange valve. "A cam with juxtaposed partial cams" is to be understood in particular as a cam which has two partial cams arranged side by side in the axial direction are provided to actuate the same gas exchange valve differently in different discrete switching positions of the cam member. An operating characteristic of the gas exchange valve is defined by the individual part cam. A "displacement of a cam follower" is to be understood in particular as meaning that a single cam follower, which is provided for picking up a cam contour of the partial cams and for actuating the gas exchange valve, and the partial cams are displaced relative to one another along an axis of rotation of the cam element, wherein the relative Displacement can be effected both by axial movement of the cam element with simultaneous axial fixation of the cam follower or by axial movement of the cam follower with simultaneous axial fixation of the cam element An "overlapping arrangement" is to be understood in particular as meaning that the partial cams are only partially superimposed, ie that in any cross sections of a partial cam the other partial cam only partially obscured. In particular, it should be understood that none of the sub-cams spans an envelope in the radial direction, within which the second sub-cam is completely arranged. "Provided" is to be understood in particular to be specially equipped and / or designed.
Weiter wird vorgeschlagen, dass das Nockenelement einen Freistich aufweist, der zwischen die beiden Teilnocken eingebracht ist. Dadurch ist eine einfache Fertigung des Nockenelements möglich. Unter einem„Freistich" soll insbesondere eine Abtragung an einer rotationssymmetrischen Innenkante mit einer bestimmten Form und festgelegten Maßen, die sowohl dem eingesetzten Werkzeug bei der Fertigung als auch dem anliegenden Teil beim Zusammenbau den erforderlichen Freiraum gibt, verstanden werden, vorzugsweise gemäß DIN 509. Unter„zwischen" soll in diesem Zusammenhang insbesondere verstanden werden, dass der Freistich entlang der Rotationsachse räumlich zwischen den Teilnocken angeordnet ist. It is further proposed that the cam element has an undercut which is introduced between the two partial cams. As a result, a simple production of the cam element is possible. Under a "undercut" is in particular a removal of a rotationally symmetrical inner edge with a certain shape and specified dimensions, which gives both the tool used in the production and the adjoining part during assembly the necessary space to be understood, preferably in accordance with DIN 509th Unter "Between" should be understood in this context, in particular, that the undercut is arranged along the axis of rotation spatially between the sub-cam.
Vorteilhafterweise weist der Freistich eine Fertigungsachse auf, die desachsiert zu einer Rotationsachse angeordnet ist. Unter einer„Fertigungsachse" soll dabei insbesondere eine virtuelle Achse verstanden werden, in Bezug auf die der Freistich zumindest in Teilbereichen eine Symmetrie, insbesondere eine Rotationssymmetrie, aufweist. Unter„desachsiert" soll insbesondere verstanden werden, dass die Fertigungsachse gegenüber der Rotationsachse verlagert ist, vorzugsweise in eine Richtung, die einer Druck- oder Gegendruckseite von einem der Teilnocken entspricht. Advantageously, the undercut on a production axis, which is arranged desachsiert to a rotation axis. A "production axis" is to be understood here as meaning, in particular, a virtual axis, with respect to which the undercut has symmetry, in particular rotational symmetry, at least in partial regions the axis of rotation is displaced, preferably in a direction corresponding to a pressure or counter-pressure side of one of the partial cams.
Zudem ist es vorteilhaft, wenn der Freistich eine Kegelstumpfform aufweist. Dadurch kann ein besonders vorteilhafter Übergang zwischen den Teilnocken erreicht werden. Unter einer„Kegelstumpfform" soll insbesondere eine Form verstanden werden, die zumindest im Wesentlichen beispielsweise in einem Längsschnitt durch das Nockenelement einem Kegelstumpf entspricht, wobei der Freistich gegenüber einem geometrisch idealen Kegelstumpf, insbesondere an Kanten, eine abgerundete Form aufweisen kann. Unter einem Längsschnitt soll insbesondere ein Schnitt verstanden werden, dessen Schnittebene durch die Rotationsachse oder achsparallel zur Rotationsachse verläuft. In addition, it is advantageous if the undercut has a truncated cone shape. As a result, a particularly advantageous transition between the partial cams can be achieved. A "truncated cone" is understood in particular to mean a shape which corresponds at least substantially to a truncated cone, for example in a longitudinal section through the cam element, wherein the undercut may have a rounded shape relative to a geometrically ideal truncated cone, in particular at edges In particular, a section are understood, the cutting plane through the axis of rotation or axially parallel to the axis of rotation.
Weiter wird vorgeschlagen, dass der Freistich zumindest in der Grundkreisphase in einem flachen Winkel in die Teilnocken übergeht. Dadurch kann eine Schaltbarkeit des Nockenfolgers vorteilhaft erhalten werden. Unter einem„flachen Winkel" soll dabei insbesondere verstanden werden, dass ein Winkel, den eine Lauffläche des Nockenfolgers mit einer Oberfläche des Freistichs einschließt, zumindest in einem Übergangsbereich zwischen der Lauffläche und dem Freistich kleiner als 45°, vorzugsweise kleiner als 40° und besonders vorteilhaft kleiner als 35° ist. It is further proposed that the undercut at least in the base circle phase merges into the partial cams at a shallow angle. As a result, a switchability of the cam follower can be advantageously obtained. A "shallow angle" is to be understood in particular as meaning that an angle which includes a running surface of the cam follower with a surface of the undercut, at least in a transition region between the tread and the undercut is less than 45 °, preferably less than 40 ° and especially is advantageously less than 35 °.
Ferner wird eine Ventiltriebvorrichtung mit einem erfindungsgemäßen Nockenelement und einer Ventilhubumschalteinheit, die dazu vorgesehen ist, das Nockenelement entlang seiner Rotationsachse zu verschieben, vorgeschlagen. Dadurch kann eine konstruktiv einfache Ventiltriebvorrichtung mit einer hohen Effizienz bereitgestellt werden. Further, a valve drive device with a cam element according to the invention and a Ventilhubumschalteinheit, which is intended to move the cam member along its axis of rotation proposed. Thereby, a structurally simple valve drive device can be provided with a high efficiency.
Außerdem wird ein Verfahren zur Fertigung eines Nockenelements für eine Ventiltriebvorrichtung einer Brennkraftmaschine, mit zumindest einem Nocken, der zumindest zwei nebeneinander angeordnete Teilnocken aufweist, die in zumindest einem Nockenwellenwin- kelbereich eine gemeinsame Grundkreisphase aufweisen und für eine Ventilhubumschal- tung durch Verschieben eines Nockenfolgers von einem der Teilnocken auf einen anderen der Teilnocken vorgesehen sind, insbesondere ein Verfahren zur Fertigung eines erfindungsgemäßen Nockenelements, vorgeschlagen, bei dem zwischen die beiden Teilnocken ein Freistich eingebracht wird. Dadurch kann das Nockenelement besonders einfach gefertigt werden. In addition, a method for producing a cam element for a valve drive device of an internal combustion engine, with at least one cam having at least two adjacent partial cam having a common Grundkreisphase in at least one Nockenwellenwin- kelbereich and for a Ventilhubumschal- device by shifting a cam follower of a the partial cams are provided on another of the partial cams, in particular a method for manufacturing a cam element according to the invention, proposed in which between the two partial cams an undercut is introduced. As a result, the cam element can be manufactured particularly easily.
Vorzugsweise werden die Teilnocken nach einem Einbringen des Freistichs einzeln geformt. Dadurch kann jeder Teilnocken mit einer individuellen Kontur versehen werden. Unter„einzeln" soll in diesem Zusammenhang insbesondere verstanden werden, dass auf einen Fertigungsschritt, in dem die Laufflächen der beiden Teilnocken gleichzeitig bearbeitet werden, verzichtet wird. Preferably, the partial cams are individually formed after insertion of the undercut. As a result, each partial cam can be provided with an individual contour. In this context, "individual" should be understood in particular to mean that a production step in which the running surfaces of the two partial cams are processed simultaneously is dispensed with.
Weitere Vorteile ergeben sich aus der folgenden Zeichnungsbeschreibung. In den Zeichnungen ist ein Ausführungsbeispiel der Erfindung dargestellt. Die Zeichnungen, die Beschreibung und die Ansprüche enthalten zahlreiche Merkmale in Kombination. Der Fachmann wird die Merkmale zweckmäßigerweise auch einzeln betrachten und zu sinnvollen weiteren Kombinationen zusammenfassen. Further advantages emerge from the following description of the drawing. In the drawings, an embodiment of the invention is shown. The drawings, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations.
Dabei zeigen: Showing:
Fig. 1 eine perspektivische Darstellung einer Ventiltriebvorrichtung mit einem er- findungsgemäßen Nockenelement,  1 is a perspective view of a valve drive device with a cam element according to the invention,
Fig 2 das Nockenelement in einem Querschnitt und  2 shows the cam element in a cross section and
Fig 3 das Nockenelement in einem Längsschnitt. 3 shows the cam element in a longitudinal section.
Die Figuren 1 bis 3 zeigen schematisiert eine Brennkraftmaschinenventiltriebvorrichtung mit einem erfindungsgemäßen Nockenelement 17. Die Brennkraftmaschinenventiltrieb- vorrichtung ist für eine Brennkraftmaschine vorgesehen, die zumindest zwei in Reihe angeordnete Zylinder aufweist, die unterschiedliche Ventilbetätigungszeiten aufweisen. Die Brennkraftmaschinenventiltriebvorrichtung ist aber auch für eine Brennkraftmaschine verwendbar, bei der in einer Reihe drei, vier oder mehr Zylinder angeordnet sind, wie beispielsweise bei einem Reihenmotor mit vier Zylindern oder einen V-Motor mit sechs Zylindern. Figures 1 to 3 show schematically an internal combustion engine valve drive device with a cam element 17 according to the invention. The internal combustion engine valve drive device is provided for an internal combustion engine having at least two cylinders arranged in series, which have different valve actuation times. However, the engine valve driving apparatus is also applicable to an internal combustion engine in which three, four or more cylinders are arranged in one row, such as a four-cylinder inline engine or a six-cylinder V-engine.
Die Brennkraftmaschinenventiltriebvorrichtung umfasst eine Nockenwelle 18 mit dem Nockenelement 17 sowie einem weiteren Nockenelement, das analog ausgestaltet ist. Das Nockenelement 17 ist als ein Nockenträger ausgebildet. Auf dem Nockenelemente 17 ist ein Nocken 10 angeordnet, der zwei Teilnocken 11 , 12 mit unterschiedlicher Nockenkontur aufweist. Das Nockenelement 17 weist noch weitere Nocken auf, die analog ausgebildet sind. Die Teilnocken 11 , 12 des Nockens 10 sind unmittelbar benachbart angeordnet. Das Nockenelement 17 ist axial verschiebbar. Durch ein axiales Verschieben des Nockenelements 17 wird innerhalb des Nockens 10 von dem einen Teilnocken 11 , 12 auf den anderen Teilnocken 11 , 12 umgeschaltet. Das Nockenelement 17 weist damit zwei diskrete Schaltstellungen auf, in denen für den oder die Zylinder, die dem Nockenelement 17 zugeordnet sind, ein unterschiedlicher Ventilhub geschaltet ist. Zur Anordnung des Nockenelements 17 umfasst die Nockenwelle 18 eine Triebwelle 19. Die Triebwelle 19 umfasst eine Kurbelwellenanbindung zur Anbindung an eine nicht näher dargestellte Kurbelwelle. Die Kurbelwellenanbindung kann mittels eines Nockenwellen- verstellers, der dazu vorgesehen ist, eine Phasenlage zwischen der Nockenwelle 18 und der Kurbelwelle einzustellen, ausgebildet sein. The internal combustion engine valve drive device comprises a camshaft 18 with the cam element 17 and a further cam element, which is designed analogously. The cam member 17 is formed as a cam carrier. On the cam elements 17, a cam 10 is arranged, which has two partial cams 11, 12 with different cam contour. The cam member 17 has still more cams, which are formed analogously. The partial cams 11, 12 of the cam 10 are arranged immediately adjacent. The cam member 17 is axially displaceable. By an axial displacement of the cam member 17 is switched within the cam 10 of the one part cam 11, 12 on the other part cam 11, 12. The cam member 17 thus has two discrete switching positions, in which a different valve lift is connected for the cylinder or cylinders associated with the cam element 17. For the arrangement of the cam member 17, the camshaft 18 comprises a drive shaft 19. The drive shaft 19 comprises a crankshaft connection for connection to a crankshaft, not shown. The crankshaft connection can be formed by means of a camshaft adjuster which is provided to set a phase position between the camshaft 18 and the crankshaft.
Das Nockenelement 17 ist axial verschiebbar und drehfest auf der Triebwelle 19 angeordnet. Die Triebwelle 19 weist an ihrem Außenumfang eine Geradverzahnung auf. Das Nockenelement 17 weist an seinem Innenumfang eine korrespondierende Geradverzahnung auf, die in die Geradverzahnung der Triebwelle 19 eingreift. The cam member 17 is axially displaceable and non-rotatably mounted on the drive shaft 19. The drive shaft 19 has a straight toothing on its outer periphery. The cam member 17 has on its inner circumference a corresponding spur toothing, which engages in the spur toothing of the drive shaft 19.
Weiter umfasst die Brennkraftmaschinenventiltriebvorrichtung eine Schaltkulisse 20. Die Schaltkulisse 20 ist dazu vorgesehen, das Nockenelement 17 und das weitere Nockenelement in einem Schaltvorgang sequentiell nacheinander zu verschieben. Zum Verschieben des Nockenelements 17 umfasst die Schaltkulisse 20 zwei Kulissenbahnen. Die erste Kulissenbahn ist dazu vorgesehen, das Nockenelement 17 und das zweite Nocke- nelemnt entlang einer ersten Schaltrichtung von der ersten Schaltstellung in die zweite Schaltstellung zu verschieben. Die zweite Kulissenbahn ist dazu vorgesehen, das Nockenelement 17 und das zweite Nockenelement entlang einer zweiten Schaltrichtung von der zweiten Schaltstellung in die erste Schaltstellung zu verschieben (vgl. Figur 1 ). Furthermore, the engine valve drive device comprises a shift gate 20. The shift gate 20 is provided to sequentially shift the cam element 17 and the further cam element in a switching operation. To shift the cam member 17, the shift gate 20 includes two slide tracks. The first slide track is provided to displace the cam element 17 and the second cam element along a first shift direction from the first shift position to the second shift position. The second slide track is provided to shift the cam element 17 and the second cam element along a second shift direction from the second shift position to the first shift position (cf., FIG. 1).
Weiter umfasst die Brennkraftmaschinenventiltriebvorrichtung eine Schalteinheit 21 , die zwei Schaltpins zum Eingriff in die Kulissenbahnen aufweist. Die Schalteinheit 21 weist ein Statorgehäuse auf, das fest mit einem Motorblock der Brennkraftmaschine verbunden ist. Die Schaltpins sind entlang ihrer Haupterstreckungsrichtung verschiebbar in dem Statorgehäuse angeordnet. Die Kulissenbahnen sind als Nuten ausgeführt, in denen die Schaltpins beidseitig zwangsgeführt werden können. Bei einem Schaltvorgang in die erste Schaltrichtung wird der erste Schaltpin in Eingriff mit der ersten Kulissenbahn gebracht. Bei einem Schaltvorgang in die zweite Schaltrichtung wird der zweite Schaltpin in Eingriff mit der zweiten Kulissenbahn gebracht. Furthermore, the internal combustion engine valve drive device comprises a switching unit 21, which has two switching pins for engagement in the slide tracks. The switching unit 21 has a stator housing which is fixedly connected to an engine block of the internal combustion engine. The switching pins are slidably disposed in the stator housing along their main extension direction. The slide tracks are designed as grooves in which the switching pins can be forcibly guided on both sides. In a switching operation in the first switching direction, the first switching pin is brought into engagement with the first slide track. In a switching operation in the second switching direction of the second switching pin is brought into engagement with the second slide track.
Die Kulissenbahnen weisen zumindest in Teilbereichen eine axiale Schrägstellung auf. Wenn einer der Schaltpins in die entsprechende Kulissenbahn eingespurt ist, bewirkt eine Drehung des Nockenelements 17 um seine Rotationsachse 16, dass der Schaltpin auf das Nockenelement 17 eine axial wirkende Kraft ausübt, die zur Verschiebung des Nockenelements 17 entlang der Rotationsachse 16 führt. Ein Nockenfolger, der zum Abgriff der Nockenkontur vorgesehen ist, wird dadurch von dem einen Teilnocken 11 , 12 auf den anderen Teilnocken 11 , 12 verschoben. Bei einer solchen Ausgestaltung ist der Nocken- folger axial fest und das Nockenelement 17 axial verschiebbar angeordnet. Grundsätzlich ist aber auch denkbar, das Nockenelement 17 axial fest und den Nockenfolger axial verschiebbar auszuführen. The slide tracks have at least in some areas an axial inclination. When one of the shift pins is meshed with the corresponding slide track, rotation of the cam member 17 about its rotational axis 16 causes the shift pin to exert on the cam member 17 an axially acting force that causes the cam member 17 to move along the rotational axis 16. A cam follower to the tap the cam contour is provided, is thereby shifted from the one part cam 11, 12 on the other part cam 11, 12. In such an embodiment, the cam follower is axially fixed and the cam member 17 is arranged axially displaceable. In principle, however, it is also conceivable to make the cam element 17 axially fixed and the cam follower axially displaceable.
Die beiden Teilnocken 11 , 12 weisen in einem Nockenwellenwinkelbereich 13 gemeinsame Grundkreisphase auf. In der gemeinsamen Grundkreisphase, die für die Ventilhub- umschaltung vorgesehen ist, wird der Nockenfolger von dem einen Teilnocken 11 , 12 auf den anderen Teilnocken 11 , 12 verschoben. In der gemeinsamen Grundkreisphase weisen die beiden Teilnocken 11 , 12 in Bezug auf die Rotationsachse 16 des Nockenelements 17 eine im Wesentlichen gleiche radiale Erstreckung auf. The two sub-cams 11, 12 have in a camshaft angle range 13 common base circle phase. In the common base circle phase, which is provided for the valve lift, the cam follower is shifted from the one part cam 11, 12 on the other part cam 11, 12. In the common base circle phase, the two partial cams 11, 12 with respect to the axis of rotation 16 of the cam member 17 on a substantially same radial extent.
Die Teilnocken 11 , 12 des Nockens 10 weise eine überlappende Anordnung auf. In zumindest einem Nockenwellenwinkelbereich 22 der Nockenwelle 18 weist der erste Teilnocken 11 eine radiale Erstreckung auf, die größer ist als eine radiale Erstreckung, die der zweite Teilnocken 12 in diesem Nockenwellenwinkelbereich 22 aufweist. In diesem Nockenwellenwinkelbereich 22 ist ein durch den ersten Teilnocken 11 bereitgestellter Ventilhub größer als ein durch den zweiten Teilnocken 11 bereitgestellter Ventilhub. In einem an den ersten Nockenwellenwinkelbereich 22 angrenzenden Nockenwellenwinkelbereich 23 der Nockenwelle 18 weist der zweite Teilnocken 12 eine radiale Erstreckung auf, die größer ist als eine radiale Erstreckung, die der erste Teilnocken 11 in diesem Nockenwellenwinkelbereich 23 aufweist. In diesem Nockenwellenwinkelbereich 23 ist ein durch den zweiten Teilnocken 12 bereitgestellter Ventilhub größer als ein durch den ersten Teilnocken 11 bereitgestellter Ventilhub. Der zweite Teilnocken 12 liegt somit nicht vollständig innerhalb einer radialen Hüllkurve, die durch den ersten Teilnocken 11 aufgespannt wird. Umgekehrt liegt auch der erste Teilnocken 11 nicht in einer radialen Hüllkurve, die durch den zweiten Teilnocken 12 aufgespannt wird. The partial cams 11, 12 of the cam 10 have an overlapping arrangement. In at least one camshaft angle region 22 of the camshaft 18, the first part cam 11 has a radial extension which is greater than a radial extent that the second part cam 12 has in this camshaft angle region 22. In this camshaft angle range 22, a valve lift provided by the first part cam 11 is greater than a valve lift provided by the second part cam 11. In a camshaft angle region 23 of the camshaft 18 adjoining the first camshaft angle region 22, the second part cam 12 has a radial extension that is greater than a radial extent that the first part cam 11 has in this camshaft angle region 23. In this camshaft angle range 23, a valve lift provided by the second part cam 12 is greater than a valve lift provided by the first part cam 11. The second part cam 12 is thus not completely within a radial envelope, which is spanned by the first part cam 11. Conversely, the first part cam 11 is not in a radial envelope, which is spanned by the second part cam 12.
Fertigungsbedingt weist das Nockenelement 17 einen Freistich 14 auf, der zwischen die beiden Teilnocken 11 , 12 eingebracht ist. Der Freistich 14 ist durch ein spanabhebendes Verfahren, insbesondere ein Fräs- und/oder Abdrehverfahren, in das Nockenelement 17 eingebracht. Der Freistich 14 erstreckt sich über einen gesamten Außenumfang des Nockenelements 17. Er ist als ein Außenfreistich in den Außenumfang des Nockenelements 17 eingebracht. Der Freistich 14 weist eine Fertigungsachse 15 auf, die desachsiert zur Rotationsachse 16 des Nockenelements 17 angeordnet ist. Der Freistich 14 weist in Bezug auf die Fertigungsachse 15 eine Symmetrie auf. Zumindest im Nockenwellenwinkelbereich 13 der Grundkreisphase ist der Freistich 14 in Bezug auf die Fertigungsachse 15 rotationssymmetrisch, d.h..er weist im Nockenwellenwinkelbereich 23 der Grundkreisphase einen Grundkreis auf, dessen Mittelpunkt auf der Fertigungsachse 15 liegt. Bei einer Fertigung des Nockenelements 17 wird das Nockenelement 17 um die Fertigungsachse 15 gedreht. Die Fertigungsachse 15 ist dabei gegenüber der Rotationsachse 16 achsparallel verschoben. For manufacturing reasons, the cam member 17 has an undercut 14 which is introduced between the two partial cams 11, 12. The undercut 14 is introduced into the cam element 17 by a machining process, in particular a milling and / or twisting method. The undercut 14 extends over an entire outer circumference of the cam element 17. It is introduced into the outer circumference of the cam element 17 as an outer free groove. The undercut 14 has a production axis 15, which is arranged offset from the axis of rotation 16 of the cam member 17. The undercut 14 has a symmetry with respect to the production axis 15. At least in the camshaft angle range 13 of the basic circle phase, the undercut 14 is rotationally symmetrical with respect to the production axis 15, ie has a base circle in the camshaft angle range 23 of the base circle phase whose center lies on the production axis 15. In a production of the cam member 17, the cam member 17 is rotated about the production axis 15. The production axis 15 is displaced axially parallel to the axis of rotation 16.
Der Freistich 14 weist eine Kegelstumpfform auf. Im Bereich des Grundkreises des Freistichs 14 verläuft eine Oberfläche des Nockenelements 17 parallel zu der Fertigungsachse 15. Seitlich geht der Freistich 14 zumindest in der Grundkreisphase in einem flachen Winkel in die Teilnocken 11 , 12 über, d.h. ein Winkel, den eine für den Nockenfolger vorgesehene Lauffläche der Teilnocken 11 , 12 mit der Oberfläche im Bereich des Freistichs 14 einschließt, ist stets kleiner als 45°. Vorzugsweise liegt der Winkel zwischen 10° und 30°. The undercut 14 has a truncated cone shape. In the region of the base circle of the undercut 14, a surface of the cam member 17 extends parallel to the production axis 15. The undercut 14 at the side in the base circle phase at a shallow angle at least in the base circle phase in the partial cams 11, 12, i. an angle which includes a provided for the cam follower tread of the partial cam 11, 12 with the surface in the region of the undercut 14 is always less than 45 °. Preferably, the angle is between 10 ° and 30 °.
Bei der Fertigung des Nockenelements 17 aus einem Rohling wird zunächst der Freistich 14 zwischen die beiden Teilnocken 11 , 12 eingebracht. Der Freistich 14 wird dabei in einem spanabhebenden Verfahren eingebracht. Grundsätzlich wäre es aber auch denkbar, den Freistich 14 durch ein Umform- oder Urformverfahren einzubringen, beispielsweise direkt bei einem Herstellungsverfahren des Rohlings. In the production of the cam member 17 from a blank, the undercut 14 is first introduced between the two partial cams 11, 12. The undercut 14 is introduced in a machining process. In principle, however, it would also be conceivable to introduce the undercut 14 by a forming or forming process, for example directly in a production process of the blank.
Nach dem Einbringen des Freistichs 14 werden die beiden Teilnocken 11 , 12 einzeln geformt. Auf eine zeitgleiche Formung beider Teilnocken 11 , 12, beispielsweise ein gleichzeitiges Schleifen der Laufflächen der beiden Teilnocken 11 , 12 im Bereich der Grundkreisphase, wird verzichtet. Die Teilnocken 11 , 12 werden nach dem Einbringen des Freistichs 14 einzeln mit Schleifwerkzeugen geschliffen, deren Breite nur geringfügig größer ist als eine Breite der einzelnen Teilnocken 11 , 12. Eine Reihenfolge, in der die Teilnocken 11 , 12 geschliffen werden, ist dabei beliebig. Bezugszeichenliste After introduction of the undercut 14, the two partial cams 11, 12 are formed individually. A simultaneous shaping of both partial cams 11, 12, for example a simultaneous grinding of the running surfaces of the two partial cams 11, 12 in the region of the basic circle phase, is dispensed with. The partial cams 11, 12 are ground individually after introduction of the undercut 14 with grinding tools whose width is only slightly larger than a width of the individual partial cams 11, 12. An order in which the partial cams 11, 12 are ground is arbitrary. LIST OF REFERENCE NUMBERS
Nocken cam
Teilnocken partial cams
Teilnocken partial cams
Nockenwellenwinkelbereich Camshaft angle range
Freistich Freeway
Fertigungsachse manufacturing axis
Rotationsachse axis of rotation
Nockenelement cam member
Nockenwelle camshaft
Triebwelle drive shaft
Schaltkulisse shift gate
Schalteinheit switching unit
Nockenwellenwinkelbereich Camshaft angle range
Nockenwellenwinkelbereich Camshaft angle range

Claims

Patentansprüche claims
1. Nockenelement für eine Ventiltriebvorrichtung einer Brennkraftmaschine, mit zumindest einem Nocken (10), der zumindest zwei nebeneinander angeordnete Teilnocken (11 , 12) aufweist, die in zumindest einem Nockenwellenwinkelbereich (13) eine gemeinsame Grundkreisphase aufweisen und für eine Ventilhubumschaltung durch Verschieben eines Nockenfolgers von einem der Teilnocken (11 , 12) auf einen anderen der Teilnocken (11 , 12) vorgesehen sind, 1. cam element for a valve drive device of an internal combustion engine, with at least one cam (10) having at least two juxtaposed partial cam (11, 12) in at least one camshaft angle range (13) have a common base circle phase and for a valve lift by shifting a cam follower from one of the partial cams (11, 12) to another of the partial cams (11, 12) are provided,
dadurch gekennzeichnet, dass  characterized in that
die Teilnocken (11 , 12) eine überlappende Anordnung aufweisen.  the partial cams (11, 12) have an overlapping arrangement.
2. Nockenelement nach Anspruch 1 , 2. cam element according to claim 1,
gekennzeichnet durch  marked by
einen Freistich (14), der zwischen die beiden Teilnocken (11 , 12) eingebracht ist.  an undercut (14) which is introduced between the two partial cams (11, 12).
3. Nockenelement nach Anspruch 2, 3. cam element according to claim 2,
dadurch gekennzeichnet, dass  characterized in that
der Freistich (14) eine Fertigungsachse (15) aufweist, die desachsiert zu einer Rotationsachse (16) angeordnet ist.  the undercut (14) has a production axis (15) which is arranged offset from a rotation axis (16).
4. Nockenelement nach Anspruch 2 oder 3, 4. cam element according to claim 2 or 3,
dadurch gekennzeichnet, dass  characterized in that
der Freistich (14) eine Kegelstumpfform aufweist. the undercut (14) has a truncated cone shape.
5. Nockenelement zumindest nach Anspruch 2, 5. cam element at least according to claim 2,
dadurch gekennzeichnet, dass  characterized in that
der Freistich (14) zumindest in der Grundkreisphase in einem flachen Winkel in die Teilnocken (11 , 12) übergeht.  the undercut (14) merges at least in the base circle phase at a shallow angle into the partial cams (11, 12).
6. Ventiltriebvorrichtung mit einem Nockenelement (17) nach einem der vorhergehenden Ansprüche und einer Ventilhubumschalteinheit, die dazu vorgesehen ist, das Nockenelement (17) entlang seiner Rotationsachse (16) zu verschieben. 6. Valve drive device comprising a cam element (17) according to one of the preceding claims and a Ventilhubumschalteinheit, which is intended to move the cam member (17) along its axis of rotation (16).
7. Verfahren zur Fertigung eines Nockenelements (17) für eine Ventiltriebvorrichtung einer Brennkraftmaschine, mit zumindest einem Nocken (10), der zumindest zwei nebeneinander angeordnete Teilnocken (11 , 12) aufweist, die in zumindest einem Nockenwellenwinkelbereich (13) eine gemeinsame Grundkreisphase aufweisen und für eine Ventilhubumschaltung durch Verschieben eines Nockenfolgers von einem der Teilnocken (11 , 12) auf einen anderen der Teilnocken (11 , 12) vorgesehen sind, insbesondere ein Verfahren zur Fertigung eines Nockenelements (17) nach einem der vorhergehenden Ansprüche, 7. A method for producing a cam member (17) for a valve drive device of an internal combustion engine, comprising at least one cam (10) having at least two adjacently arranged part cam (11, 12) in at least one camshaft angle region (13) have a common base circle phase and for a valve lift switching by displacing a cam follower from one of the partial cams (11, 12) to another of the partial cams (11, 12), in particular a method for manufacturing a camming element (17) according to one of the preceding claims,
dadurch gekennzeichnet, dass  characterized in that
zwischen die beiden Teilnocken (11 , 12) ein Freistich (14) eingebracht wird.  between the two partial cams (11, 12) an undercut (14) is introduced.
8. Verfahren nach Anspruch 7, 8. The method according to claim 7,
dadurch gekennzeichnet, dass  characterized in that
die Teilnocken (11 , 12) nach einem Einbringen des Freistichs (14) einzeln geformt werden.  the partial cams (11, 12) are individually formed after insertion of the undercut (14).
EP12740052.1A 2011-08-09 2012-07-17 Cam element for a valve-gear device Active EP2742215B1 (en)

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DE102011109764A DE102011109764A1 (en) 2011-08-09 2011-08-09 Cam element for a valve drive device
PCT/EP2012/003001 WO2013020635A1 (en) 2011-08-09 2012-07-17 Cam element for a valve-gear device

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CN103717848B (en) 2016-06-29
US9046011B2 (en) 2015-06-02
US20140150743A1 (en) 2014-06-05
WO2013020635A1 (en) 2013-02-14
EP2742215B1 (en) 2015-09-16
CN103717848A (en) 2014-04-09
JP2014521876A (en) 2014-08-28
DE102011109764A1 (en) 2013-02-14

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