EP3221567A1 - Valve train for an internal combustion engine and corresponding internal combustion engine - Google Patents

Valve train for an internal combustion engine and corresponding internal combustion engine

Info

Publication number
EP3221567A1
EP3221567A1 EP15795113.8A EP15795113A EP3221567A1 EP 3221567 A1 EP3221567 A1 EP 3221567A1 EP 15795113 A EP15795113 A EP 15795113A EP 3221567 A1 EP3221567 A1 EP 3221567A1
Authority
EP
European Patent Office
Prior art keywords
axial
slide tracks
slide
tracks
cam
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
EP15795113.8A
Other languages
German (de)
French (fr)
Other versions
EP3221567B1 (en
Inventor
Matthias Ortmann
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.)
Audi AG
Original Assignee
Audi 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 Audi AG filed Critical Audi AG
Publication of EP3221567A1 publication Critical patent/EP3221567A1/en
Application granted granted Critical
Publication of EP3221567B1 publication Critical patent/EP3221567B1/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
    • 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

Definitions

  • Valve train for an internal combustion engine and corresponding
  • the invention relates to a valve train for an internal combustion engine, with at least one base camshaft on the rotationally fixed and axially displaceable between at least two axial positions at least one
  • Ventilbetatigungsnocken exhibiting cam carrier wherein the cam carrier for axial displacement by means of an actuator associated with a shift gate, which has at its periphery two counter-rotating in the axial direction, partially spaced apart, at an orifice point merging gate tracks, both link paths each having an axial projection in the direction one the other of the slide tracks in the axial direction limiting
  • the invention further relates to a
  • the valve train is designed for use with the internal combustion engine, in particular it is part of the internal combustion engine.
  • the valve train is used for an internal combustion engine, in which the cycle of gas exchange valves of individual cylinders of the internal combustion engine for
  • the at least one cam carrier which can also be referred to as cam piece, is rotationally fixed and axially displaceable
  • the cam carrier is usually associated with a plurality, that is to say at least two, valve actuation cams.
  • Each of these valve actuation cams has an eccentricity which corresponds to the actuation of one of the
  • valve actuating cam run together with the base camshaft so that the respective gas exchange valve of the internal combustion engine is actuated by the associated valve actuating cam or its eccentricity at least once per revolution of the basic camshaft.
  • Ventilbetl operates preferably with a
  • valve actuation cams are provided, which may be assigned to different cam groups.
  • Valve actuation cams of a cam group now differ, for example, with respect to the angular position of their eccentricity and / or the extension of the same in the radial direction (height) and / or in
  • Base camshaft By axially displacing the cam carrier, it can be brought into at least two axial positions, for example into a first and a second axial position.
  • the gas exchange valve In the first axial position, the gas exchange valve is actuated by a first one of the valve actuation cams and in the second axial position by a second one of the valve actuation cams associated with the same cam group.
  • the displacement or displacement of the cam carrier in the axial direction takes place by means of an adjusting device which comprises the shift gate on the cam carrier and the stationarily arranged actuator, usually in a cylinder head of the internal combustion engine.
  • the actuator has via an extendable driver, which can be brought into engagement with a, for example, helical or spiral slide track of the shift gate.
  • the slide track or the slide tracks are provided on the shift gate, which is associated with the cam carrier.
  • the shift gate is formed on the cam carrier or operatively connected thereto for axial displacement.
  • the slide tracks are each along a course of a
  • Guide tracks are, for example, as radial grooves, which pass through the circumference of the shift gate, so are formed open-edge in this.
  • the curved path for example, is centrally located in the slide track and is a line in the mathematical sense. This line can be composed of several line sections. If in the following of a point of the slide track is mentioned, so is always a point on the slide track underlying cam track meant.
  • the slide tracks run at least partially in the axial direction in opposite directions and open at the outlet point into one another.
  • Gateways are partially spaced apart, so do not go directly into each other.
  • the slide tracks are arranged substantially Y-shaped, wherein - seen in the circumferential direction with respect to the axis of rotation of the base camshaft - the slide tracks are spaced from the discharge point in a first direction, also starting from the discharge point in one of first direction opposite second direction, however, run in the form of a common slide track.
  • Cam piece to be provided with a flexible guide member which serves to form relative to the outer guide walls axially movable inner guide walls of the Axialkulisse and switches the manner of a switch in the crossing region of the slide tracks between them, so released for the actuating pin one of the slide tracks and locked the other slide track is.
  • Camshaft for a variable-stroke valve drive of an internal combustion engine with a carrier shaft and a rotatable and axially displaceable thereon
  • cam piece which is composed of a cam carrier and a sleeve, wherein the cam carrier is a cam group
  • the Setting should be made by cutting metal sheet material to the sleeve by cutting.
  • Valve gear of an internal combustion engine having a base camshaft and a rotatably mounted in this axially displaceable and cam carrier having at least two cams for alternative actuation of a valve.
  • To move the cam carrier is at least one actuator
  • Displacement area for moving the cam carrier by means of the
  • Locking mechanism for locking the cam carrier in the
  • Locking mechanism is in a shift position of the cam carrier, in which the actuator is located in the crossing region of the switching curves, so effective that a switching force for moving the cam carrier is introduced into this locking member.
  • Axialpositionen axially displaceable at least one cam actuating cam exhibiting cam carrier is provided, wherein the cam carrier for axial displacement by means of an actuator associated with a shift gate, which has on its circumference via two opposing in the axial direction, intersecting link tracks, each having a turning point exhibit. It is provided that the reversal points are circumferentially offset from each other.
  • This is achieved according to the invention with a valve train having the features of claim 1. It is provided that the axial projections of the slide tracks are arranged offset from one another in the circumferential direction. Basically, it is therefore provided that both slide tracks each have an axial projection in the direction of one of the other of the
  • Sliding link tracks have in the axial direction limiting link track wall.
  • a projection which has a maximum extent in the axial direction at a circumferential position with respect to the axis of rotation of the base camshaft and on both sides of this circumferential position is designed with an extension in the axial direction, which is smaller than the maximum extent.
  • the axial projection is so far, for example, in the form of a bulbous elevation in the axial direction.
  • Catch device is assigned, which holds the cam carrier in each case one of a plurality of axial positions detent.
  • the latching device holds the cam carrier in each of the plurality of axial positions.
  • at least two, in particular exactly two mutually different axial positions are provided.
  • Detent device for changing the axial position, a certain force must be applied. This is achieved with the help of the actuator. However, if the momentum generated by the actuator is insufficient, it will reach
  • Cam carrier does not have the desired axial position, resulting in the incomplete displacement described above.
  • both slide tracks each have an axial projection in the direction of the other of the slide tracks in the axial direction limiting link track wall.
  • the problem of incomplete displacement is thus far removed not only for one of the slide tracks, but rather for both slide tracks effectively.
  • the Axial projections while the same dimensions, in particular the same axial extent, ie in particular the same maximum axial extent, and / or the same extent in the circumferential direction.
  • the width of the slide tracks is reduced or widened for a given width of the slide tracks of the cam carrier.
  • the former causes the valve train is difficult to produce, because under certain circumstances, the slide tracks, especially in that
  • the axial projections of the slide tracks are arranged offset from each other in the circumferential direction. This preferably means that the circumferential positions at which the axial projections each have their greatest extent in the axial direction, in
  • Circumferential direction are offset from each other.
  • the opposing arrangement of the axial projections again reveals the problem that the slide tracks may be too narrow for the milling tool used. For this reason, it is particularly advantageous if the axial projections are arranged offset from one another, so do not face each other in the circumferential direction.
  • a development of the invention provides that the offset of the
  • Axial projections is chosen such that the smallest distance between the axial projections corresponds to at least a width of the slide tracks.
  • the smallest distance between the axial projections is preferably defined as the length of that straight line which the axial projections or those circumferential positions on which the
  • Axial projections have their greatest extent in the axial direction, connects to each other. This smallest distance should at least correspond to the width of the slide tracks, wherein the slide tracks usually have the same width. Of course, the smallest distance between the axial projections but also be greater than the width of the slide tracks.
  • the guide tracks run separately from each other and after the discharge point in the form of a common slide track before the discharge point, wherein in the common slide track a Ausschubrampe is formed.
  • the slide tracks Seen in the circumferential direction in front of the mouth point, the slide tracks are spaced apart from each other, which means that the depressions forming them do not merge into one another at the same circumferential position.
  • the slide tracks meet each other for the first time or merge into each other.
  • the slide tracks run together, so that they form the common slide track.
  • the Ausschubrampe is provided, which in particular by a in the of
  • Kulissenbahnen or a growing distance of a reason of the slide tracks is characterized.
  • the driver engages in front of the discharge point in one of the slide tracks and passes through them to the discharge point. He then passes through the common slide track and is urged by the Ausschubrampe in the radial direction to the outside, so that he after passing through the common slide path is preferably present again in its starting position.
  • the axial projections are present in the common slide track. Preferably, at least that circumferential position at which the axial projection or the axial projections is their largest
  • the axial projections are chosen such that the respective axial projection is spaced at the location of its maximum axial extent in the axial direction by a distance from a longitudinal center line of the common link path, which corresponds to at least half of the axial extent of a driver of the actuator.
  • the longitudinal center line corresponds to the curved path already explained above, which always runs in the middle of the respective slide track.
  • the longitudinal center line of each slide track runs in the axial direction in the center of the slide track and on the bottom.
  • the distance of the axial projection from the longitudinal center axis corresponds exactly to half the axial extent of the driver. This means that the driver is deflected in passing through the slide track of the axial projection so that it after the
  • Axial projection - seen in the axial direction - approximately centrally, preferably exactly centered, in the slide track, or the common slide track is arranged.
  • both axial projections or their axial extensions are selected accordingly, so that the driver regardless of which slide track he goes through, in Circumferential direction is close to the axial projection in the axial direction centrally in the slide track.
  • groove depths of the slide tracks are the same at the same circumferential positions. Under the groove depth is preferably the distance between a base of the respective slide track and an outer periphery of the shift gate to understand. The lower the groove depth, the greater the distance between the axis of rotation of the base camshaft and the base of the slide track in the radial direction.
  • the same groove depths of the slide tracks at the same circumferential positions have the advantage that the reason of one of
  • the groove depth decreases from a point of greatest axial extent of that axial projection to form the Ausschubrampe, the front is in the circumferential direction.
  • the Ausschubrampe ensures a pushing out of the driver in the radial direction of the
  • the groove depth should decrease in the region of the Ausschubrampe, preferably steadily decrease.
  • the Ausschubrampe and thus the decrease in the groove depth in the circumferential direction begins already from that circumferential position at which the largest axial extent of the
  • Axial projection feasible which is behind in the circumferential direction.
  • the invention further relates to an internal combustion engine with a
  • Valve gear in particular according to the preceding embodiments, wherein the valve train has at least one base camshaft on the rotatably and axially displaceable between at least two axial positions at least one Ventilbetuschistsnocken exhibiting cam carrier is provided, wherein the cam carrier for axial displacement by means of an actuator associated with a shift gate, which its circumference two in axial
  • both link paths each having an axial projection in the direction of the other of the link tracks in the axial direction limiting
  • Kulissenbahnwand has. It is provided that the axial projections of the slide tracks are arranged offset from one another in the circumferential direction.
  • Figure 1 shows a portion of an internal combustion engine, namely a
  • Figure 2 is a schematic representation of the courses of
  • FIG. 1 shows a region of an internal combustion engine 1, in particular a valve drive 2.
  • a shift gate 3 is shown, which is arranged so as to be displaceable in the axial direction on a base camshaft 4 of the valve drive 2.
  • the shift gate 3 for this purpose an internal toothing, which in an external toothing of the
  • Base camshaft 4 engages.
  • the shift gate 3 is associated with at least one cam carrier, not shown here, on which at least one valve actuating cam is provided.
  • the valve actuating cam is used to actuate at least one gas exchange valve of the internal combustion engine
  • a plurality of valve actuating cam are provided on the cam carrier, wherein in different axial positions of the
  • Cam carrier different valve actuation cam serve to actuate the gas exchange valve.
  • the cam carrier is displaceable by means of the shift gate 3 in the axial direction.
  • the valve drive 2 has an actuator 5 with a driver 6.
  • the actuator 5 is such
  • the shift gate 3 has a first slide track 8 and a second slide track 9.
  • Each of the slide tracks 8 and 9 is of a Longitudinal center line 10 and 11 defined, which in the axial direction seen centrally in the respective slide track 8 and 9, respectively.
  • the slide tracks 8 and 9 merge into each other at an outlet point 12.
  • the mouth 12 can be defined by the point 13 at which the longitudinal center lines 10 and 11 merge into each other.
  • the peripheral point 12 can also be understood as that peripheral position at which a dividing wall 14 present between the slide tracks 8 and 9 is omitted for the first time. It is clear that the slide tracks 8 and 9 are spaced from each other before the discharge point 12, in particular between them the partition wall 14 before. Because they are in the opposite direction in the axial direction
  • Outlet point 12 merge into each other. After the confluence point 12 they continue in the form of a common slide track 15 on. Again, this is characterized by the course of the longitudinal center lines 10 and 11, which now extend overlapping. In the axial direction to the outside, the slide tracks 8 and 9 are each bounded by a slide track wall 16 and 17 respectively.
  • the actuator 5 is actuated in such a way that the driver 6 is extended in the radial direction, ie is displaced in the direction of the base camshaft 4. Accordingly, he intervenes in one of the slide tracks 8 and 9 (here: the first slide track 8). Because the
  • Shift gate 3 is driven by the base camshaft 3 in the circumferential direction, the driver 6 passes through the slide track 8 in the direction of the common slide track 15. At least partially it is against the slide track wall 16, whereby the shift gate 3 and therefore also the cam carrier is displaced in the axial direction ,
  • the slide tracks 8 and 9 in the embodiment shown here both slide tracks 8 and 9, an axial projection 18 and 19 respectively. This protrudes in the direction of the other of the slide tracks 9 and 8 in the axial direction limiting link track wall 17 and 16.
  • the axial projection 18 and 9 is designed such that its extension in the axial direction of the other
  • the width of the slide tracks 8 and 9 and the common slide track 15 after the circumferential position at which the maximum axial extension is present increases or decreases the axial extent of the axial projection 18 and 19 again.
  • the axial projections 18 and 19 are arranged opposite in the circumferential direction.
  • Circumferential direction can be arranged after the axial projection 18.
  • the axial projections 18 and 19 are configured or their offset in the circumferential direction is selected such that the smallest distance 20 between the axial projections 18 and 19 at least one width 21 of the slide tracks 8 and 9 corresponds. Preferably, they have the same width. In addition, it may be provided that the smallest distance 22 in the axial direction between the axial projections 18 and 19 is dimensioned such that it corresponds to at least one axial extension 23 of the driver 6. In particular, the distance 22 is just as great as the
  • the common slide track 15 can be formed with the same milling tool as the slide tracks 8 and 9.

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  • 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 valve train (2) for an internal combustion engine (1), comprising at least one main camshaft (4), on which at least one cam carrier having valve-actuating cams is provided, said cam carrier being rotationally fixed and capable of axial movement between at least two axial positions, wherein a shifting gate (3) is associated with the cam carrier for axial movement by means of an actuator (5), which shifting gate has two gate tracks (8, 9) on the perimeter of the shifting gate, which extend opppositely in the axial direction, are partially spaced apart from each other and lead into each other at a mouth point (12). According to the invention, at least one of the gate tracks (8, 9) has an axial projection (18, 19) toward a gate track wall (16, 17) bounding the other of the gate tracks (9, 8) in the axial direction. The invention further relates to an internal combustion engine (1).

Description

Ventiltrieb für eine Brennkraftmaschine sowie entsprechende  Valve train for an internal combustion engine and corresponding
Brennkraftmaschine  Internal combustion engine
Die Erfindung betrifft einen Ventiltrieb für eine Brennkraftmaschine, mit wenigstens einer Grundnockenwelle, auf der drehfest und zwischen wenigstens zwei Axialpositionen axial verlagerbar mindestens ein The invention relates to a valve train for an internal combustion engine, with at least one base camshaft on the rotationally fixed and axially displaceable between at least two axial positions at least one
Ventilbetatigungsnocken aufweisender Nockenträger vorgesehen ist, wobei dem Nockenträger zum axialen Verlagern mittels eines Aktuators eine Schaltkulisse zugeordnet ist, welche an ihrem Umfang zwei in axialer Richtung gegenläufige, teilweise voneinander beabstandete, an einer Mündungsstelle ineinander einmündende Kulissenbahnen aufweist, wobei beide Kulissenbahnen jeweils einen Axialvorsprung in Richtung einer die jeweils andere der Kulissenbahnen in axialer Richtung begrenzende Ventilbetatigungsnocken exhibiting cam carrier is provided, wherein the cam carrier for axial displacement by means of an actuator associated with a shift gate, which has at its periphery two counter-rotating in the axial direction, partially spaced apart, at an orifice point merging gate tracks, both link paths each having an axial projection in the direction one the other of the slide tracks in the axial direction limiting
Kulissenbahnwand aufweisen. Die Erfindung betrifft weiterhin eine Have backdrop track wall. The invention further relates to a
Brennkraftmaschine. Internal combustion engine.
Der Ventiltrieb ist für den Einsatz mit der Brennkraftmaschine ausgelegt, insbesondere ist er Bestandteil der Brennkraftmaschine. Der Ventiltrieb wird für eine Brennkraftmaschine eingesetzt, bei welcher das Arbeitsspiel von Gaswechselventilen einzelner Zylinder der Brennkraftmaschine zur The valve train is designed for use with the internal combustion engine, in particular it is part of the internal combustion engine. The valve train is used for an internal combustion engine, in which the cycle of gas exchange valves of individual cylinders of the internal combustion engine for
Verbesserung der thermodynamischen Eigenschaften beeinflusst werden kann. Der mindestens eine Nockenträger, welcher auch als Nockenstück bezeichnet werden kann, ist drehfest und axial verschiebbar Improvement of the thermodynamic properties can be influenced. The at least one cam carrier, which can also be referred to as cam piece, is rotationally fixed and axially displaceable
beziehungsweise verlagerbar auf der Grundnockenwelle angeordnet. or displaceable arranged on the base camshaft.
Dem Nockenträger sind üblicherweise mehrere, also zumindest zwei, Ventilbetätigungsnocken zugeordnet. Jeder dieser Ventilbetätigungsnocken weist eine Exzentrizität auf, welche der Betätigung eines der The cam carrier is usually associated with a plurality, that is to say at least two, valve actuation cams. Each of these valve actuation cams has an eccentricity which corresponds to the actuation of one of the
Gaswechselventile der Brennkraftmaschine bei einem bestimmten Drehwinkel der Grundnockenwelle dient. Die Ventilbetätigungsnocken laufen demnach gemeinsam mit der Grundnockenwelle um, sodass das jeweilige Gaswechselventil der Brennkraftmaschine zumindest einmal pro Umdrehung der Grundnockenwelle von dem zugeordneten Ventilbetätigungsnocken beziehungsweise dessen Exzentrizität betätigt wird. Der Gas exchange valves of the internal combustion engine at a certain Angle of rotation of the basic camshaft is used. Accordingly, the valve actuating cam run together with the base camshaft so that the respective gas exchange valve of the internal combustion engine is actuated by the associated valve actuating cam or its eccentricity at least once per revolution of the basic camshaft. Of the
Ventilbetätigungsnocken wirkt dabei vorzugsweise mit einem Ventilbetätigungsnocken acts preferably with a
Rollenschlepphebel des Gaswechselventils zusammen, indem er mit diesem in Anlagekontakt tritt. Vorzugsweise sind mehrere Ventilbetätigungsnocken vorgesehen, welche unterschiedlichen Nockengruppen zugeordnet sein können. Die Roll cam followers of the gas exchange valve together by it comes into abutting contact with this. Preferably, a plurality of valve actuation cams are provided, which may be assigned to different cam groups. The
Ventilbetätigungsnocken einer Nockengruppe unterscheiden sich nun beispielsweise hinsichtlich der Winkellage ihrer Exzentrizität und/oder der Erstreckung derselben in radialer Richtung (Höhe) und/oder in Valve actuation cams of a cam group now differ, for example, with respect to the angular position of their eccentricity and / or the extension of the same in the radial direction (height) and / or in
Umfangsrichtung (Länge), jeweils bezüglich einer Drehachse der Circumferential direction (length), each with respect to a rotation axis of
Grundnockenwelle. Durch das axiale Verlagern des Nockenträgers kann dieser in wenigstens zwei Axialpositionen, beispielsweise in eine erste und eine zweite Axialposition, gebracht werden. In der ersten Axialposition wird das Gaswechselventil von einem ersten der Ventilbetätigungsnocken und in der zweiten Axialposition von einem zweiten der Ventilbetätigungsnocken betätigt, welche derselben Nockengruppe zugeordnet sind. Durch die  Base camshaft. By axially displacing the cam carrier, it can be brought into at least two axial positions, for example into a first and a second axial position. In the first axial position, the gas exchange valve is actuated by a first one of the valve actuation cams and in the second axial position by a second one of the valve actuation cams associated with the same cam group. By the
Verlagerung des Nockenträgers können somit insbesondere der Relocation of the cam carrier can thus in particular the
Öffnungszeitpunkt, die Öffnungsdauer und/oder der Hub des Opening time, the opening time and / or the stroke of
Gaswechselventils, insbesondere in Abhängigkeit von einem Gas exchange valve, in particular depending on a
Betriebszustand der Brennkraftmaschine, ausgewählt und eingestellt werden. Operating state of the internal combustion engine to be selected and adjusted.
Das Verschieben beziehungsweise Verlagern des Nockenträgers in axialer Richtung erfolgt mithilfe einer Stelleinrichtung, die die Schaltkulisse auf dem Nockenträger und den ortsfest angeordneten Aktuator, üblicherweise in einem Zylinderkopf der Brennkraftmaschine, umfasst. Der Aktuator verfügt über einen ausfahrbaren Mitnehmer, der sich mit einer beispielsweise schrauben- oder spiralförmigen Kulissenbahn der Schaltkulisse in Eingriff bringen lässt. Die Kulissenbahn beziehungsweise die Kulissenbahnen sind an der Schaltkulisse vorgesehen, welche dem Nockenträger zugeordnet ist. Beispielsweise ist die Schaltkulisse an dem Nockenträger ausgebildet oder mit diesem zum axialen Verlagern wirkverbunden. The displacement or displacement of the cam carrier in the axial direction takes place by means of an adjusting device which comprises the shift gate on the cam carrier and the stationarily arranged actuator, usually in a cylinder head of the internal combustion engine. The actuator has via an extendable driver, which can be brought into engagement with a, for example, helical or spiral slide track of the shift gate. The slide track or the slide tracks are provided on the shift gate, which is associated with the cam carrier. For example, the shift gate is formed on the cam carrier or operatively connected thereto for axial displacement.
Die Kulissenbahnen liegen jeweils entlang eines Verlaufs einer The slide tracks are each along a course of a
vorzugsweise, jedoch nicht notwendigerweise stetigen Kurvenbahn vor und weisen eine bestimmte Breite auf, welche vorzugsweise auf die Breite des Mitnehmers des Aktuators abgestimmt ist. Üblicherweise ist die preferably, but not necessarily continuous curved track and have a certain width, which is preferably adapted to the width of the driver of the actuator. Usually that is
Kulissenbahn geringfügig breiter als der Mitnehmer, sodass ein problemloses Durchlaufen der Kulissenbahn durch den Mitnehmer möglich ist. Die Sliding track slightly wider than the driver, so that a smooth passage through the slide track is possible by the driver. The
Kulissenbahnen liegen beispielsweise als Radialnuten vor, welche den Umfang der Schaltkulisse durchgreifen, also randoffen in dieser ausgebildet sind. Die Kurvenbahn liegt beispielsweise zentral in der Kulissenbahn vor und ist eine Linie im mathematischen Sinn. Diese Linie kann sich aus mehreren Linienabschnitten zusammensetzen. Wenn im Folgenden von einem Punkt der Kulissenbahn die Rede ist, so ist stets ein Punkt auf der der Kulissenbahn zugrunde liegenden Kurvenbahn gemeint. Guide tracks are, for example, as radial grooves, which pass through the circumference of the shift gate, so are formed open-edge in this. The curved path, for example, is centrally located in the slide track and is a line in the mathematical sense. This line can be composed of several line sections. If in the following of a point of the slide track is mentioned, so is always a point on the slide track underlying cam track meant.
Die Kulissenbahnen verlaufen wenigstens bereichsweise in axialer Richtung gegenläufig und münden an der Mündungsstelle ineinander ein. Die The slide tracks run at least partially in the axial direction in opposite directions and open at the outlet point into one another. The
Kulissenbahnen sind teilweise voneinander beabstandet, gehen also nicht unmittelbar ineinander über. Beispielsweise sind die Kulissenbahnen im Wesentlichen Y-förmig angeordnet, wobei - in Umfangsrichtung bezüglich der Drehachse der Grundnockenwelle gesehen - die Kulissenbahnen ausgehend von der Mündungsstelle in eine erste Richtung voneinander beabstandet sind, ebenfalls ausgehend von der Mündungsstelle in eine der ersten Richtung entgegengesetzte zweite Richtung jedoch in Form einer gemeinsamen Kulissenbahn verlaufen. Gateways are partially spaced apart, so do not go directly into each other. For example, the slide tracks are arranged substantially Y-shaped, wherein - seen in the circumferential direction with respect to the axis of rotation of the base camshaft - the slide tracks are spaced from the discharge point in a first direction, also starting from the discharge point in one of first direction opposite second direction, however, run in the form of a common slide track.
Aus dem Stand der Technik ist beispielsweise die Druckschrift DE 10 2008 024 911 A1 bekannt. Diese betrifft einen Ventiltrieb einer Brennkraftmaschine mit einer Nockenwelle, die eine Trägerwelle und ein darauf drehfest und axial verschiebbar angeordnetes Nockenstück umfasst, das zumindest eine Nockengruppe unmittelbar benachbarter Nocken mit unterschiedlichen Erhebungen zur variablen Betätigung eines Gaswechselventils und eine Axialkulisse mit äußeren Führungswänden zur Vorgabe zweier sich From the prior art, for example, the document DE 10 2008 024 911 A1 is known. This relates to a valve train of an internal combustion engine with a camshaft, which comprises a support shaft and a rotatably and axially slidably arranged cam piece, the at least one cam group immediately adjacent cam with different elevations for variable actuation of a gas exchange valve and a Axialkulisse with outer guide walls for specifying two
kreuzender Kulissenbahnen aufweist, und mit einem in die Axialkulisse radial zur Nockenwelle einkuppelbaren Betätigungsstift zum Verlagern desHaving intersecting slide tracks, and with a radially engageable in the Axialkulisse camshaft actuating pin for moving the
Nockenstücks in Richtung beider Kulissenbahnen. Dabei soll das Cam piece in the direction of both slide tracks. It should be the
Nockenstück mit einem flexiblen Führungselement versehen sein, das zur Bildung relativ zu den äußeren Führungswänden axial beweglicher innerer Führungswände der Axialkulisse dient und das nach Art einer Weiche im Kreuzungsbereich der Kulissenbahnen zwischen diesen umschaltet, sodass für den Betätigungsstift eine der Kulissenbahnen freigegeben und die andere Kulissenbahn gesperrt ist. Cam piece to be provided with a flexible guide member which serves to form relative to the outer guide walls axially movable inner guide walls of the Axialkulisse and switches the manner of a switch in the crossing region of the slide tracks between them, so released for the actuating pin one of the slide tracks and locked the other slide track is.
Weiterhin beschreibt die Druckschrift DE 10 2008 054 254 A1 eine Furthermore, the document DE 10 2008 054 254 A1 describes a
Nockenwelle für einen hubvariablen Ventiltrieb einer Brennkraftmaschine, mit einer Trägerwelle und einem darauf drehfest und axialverschiebbar Camshaft for a variable-stroke valve drive of an internal combustion engine, with a carrier shaft and a rotatable and axially displaceable thereon
angeordneten Nockenstück, das aus einem Nockenträger und einer Hülse zusammengesetzt ist, wobei der Nockenträger eine Nockengruppe arranged cam piece, which is composed of a cam carrier and a sleeve, wherein the cam carrier is a cam group
unmittelbar benachbarter Nocken mit unterschiedlichen Nockenhüben und einen Zapfen aufweist, auf dem die Hülse befestigt ist, und wobei die Hülse eine Kulisse in Form einer sich über den Umfang der Hülse erstreckenden Nut aufweist, die zur Vorgabe einer axialen Kulissenbahn für einen das Nockenstück auf der Trägerwelle verschiebenden Bestätigungsstift dient. Die Kulisse soll durch spanloses Umformen von Blechwerkstoff zu der Hülse hergestellt sein. immediately adjacent cam with different cam strokes and a pin on which the sleeve is mounted, and wherein the sleeve has a slot in the form of a groove extending over the circumference of the sleeve, which is for specifying an axial slide track for a cam piece on the support shaft shifting confirmation pen is used. The Setting should be made by cutting metal sheet material to the sleeve by cutting.
Weiterhin beschreibt die Druckschrift DE 10 2013 111 476 A1 einen Furthermore, the document DE 10 2013 111 476 A1 describes a
Ventiltrieb einer Brennkraftmaschine mit einer Grundnockenwelle und einem in dieser drehfest und axial verschiebbar gelagerten Nockenträger, der mindestens zwei Nocken zum alternativen Betätigen eines Ventils aufweist. Zum Verschieben des Nockenträgers ist mindestens ein Aktuator Valve gear of an internal combustion engine having a base camshaft and a rotatably mounted in this axially displaceable and cam carrier having at least two cams for alternative actuation of a valve. To move the cam carrier is at least one actuator
vorgesehen, dem zwei Schaltkurven zugeordnet sind. Die jeweilige provided, the two switching curves are assigned. The respective
Schaltkurve weist einen Einspurbereich für den Aktuator, einen Switching curve has a Einspurbereich for the actuator, a
Verschiebebereich zum Verschieben des Nockenträgers mittels des  Displacement area for moving the cam carrier by means of the
Aktuators und einen Auswerferbereich auf. Die beiden Schaltkurven kreuzen sich in deren Verschiebebereichen. In diesem Kreuzungsbereich ist der Aktuator außer Kontakt mit den Schaltkurven. Zusätzlich ist ein Actuator and an ejector on. The two switching curves intersect in their displacement ranges. In this crossing region, the actuator is out of contact with the switching curves. In addition, one is
Arretiermechanismus zum Arretieren des Nockenträgers in dessen Locking mechanism for locking the cam carrier in the
Schaltstellungen vorgesehen. Ein federbelastetes Arretierglied des Switch positions provided. A spring-loaded locking member of
Arretiermechanismus ist in einer Verschiebeposition des Nockenträgers, in der sich der Aktuator im Kreuzungsbereich der Schaltkurven befindet, derart wirksam, dass über dieses Arretierglied eine Schaltkraft zum Verschieben des Nockenträgers in diesen eingeleitet wird. Locking mechanism is in a shift position of the cam carrier, in which the actuator is located in the crossing region of the switching curves, so effective that a switching force for moving the cam carrier is introduced into this locking member.
Schließlich beschreibt die Druckschrift DE 10 2011 114 300 A1 einen Ventiltrieb einer Brennkraftmaschine, mit wenigstens einer Finally, the publication DE 10 2011 114 300 A1 describes a valve train of an internal combustion engine, with at least one
Grundnockenwelle, auf der drehfest und zwischen wenigstens zwei Basic camshaft, on the non-rotatable and between at least two
Axialpositionen axial verschiebbar wenigstens ein Ventilbetätigungsnocken aufweisender Nockenträger vorgesehen ist, wobei dem Nockenträger zum axialen Verschieben mittels eines Aktuators eine Schaltkulisse zugeordnet ist, welche an ihrem Umfang über zwei in axialer Richtung gegenläufige, sich kreuzende Kulissenbahnen verfügt, die jeweils einen Umkehrpunkt aufweisen. Dabei ist vorgesehen, dass die Umkehrpunkte in Umfangsrichtung versetzt zueinander vorliegen. Axialpositionen axially displaceable at least one cam actuating cam exhibiting cam carrier is provided, wherein the cam carrier for axial displacement by means of an actuator associated with a shift gate, which has on its circumference via two opposing in the axial direction, intersecting link tracks, each having a turning point exhibit. It is provided that the reversal points are circumferentially offset from each other.
Es ist Aufgabe der Erfindung, einen Ventiltrieb für eine Brennkraftmaschine vorzuschlagen, welcher gegenüber dem bekannten Stand der Technik Vorteile aufweist, insbesondere einen größeren Verschiebeweg für den Aktuator beziehungsweise den Mitnehmer in axialer Richtung aufweist, gleichzeitig jedoch einfach herzustellen ist. Dies wird erfindungsgemäß mit einem Ventiltrieb mit den Merkmalen des Anspruchs 1 erreicht. Dabei ist vorgesehen, dass die Axialvorsprünge der Kulissenbahnen in Umfangsrichtung gegeneinander versetzt angeordnet sind. Grundsätzlich ist also vorgesehen, dass beide Kulissenbahnen jeweils einen Axialvorsprung in Richtung einer die jeweils andere der It is an object of the invention to propose a valve train for an internal combustion engine, which has advantages over the known prior art, in particular has a larger displacement for the actuator or the driver in the axial direction, but at the same time is easy to manufacture. This is achieved according to the invention with a valve train having the features of claim 1. It is provided that the axial projections of the slide tracks are arranged offset from one another in the circumferential direction. Basically, it is therefore provided that both slide tracks each have an axial projection in the direction of one of the other of the
Kulissenbahnen in axialer Richtung begrenzende Kulissenbahnwand aufweisen. Mithilfe des Axialvorsprungs wird der Verschiebeweg der wenigstens einen Kulissenbahn vergrößert. Das bedeutet, dass die Sliding link tracks have in the axial direction limiting link track wall. By means of the axial projection of the displacement of the at least one slide track is increased. That means the
Kulissenbahnwand der Kulissenbahn in axialer Richtung der die jeweils andere der Kulissenbahnen begrenzende Kulissenbahnwand vorspringt. Dies bewirkt, dass der Aktuator beziehungsweise dessen Mitnehmer durch den Axialvorsprung weiter in axialer Richtung ausgelenkt wird als dies bei bisherigen Ausführungsformen des Ventiltriebs der Fall ist. Sliding track wall of the slide track in the axial direction of the other each of the slide tracks delimiting slide wall projecting. This causes the actuator or its driver is further deflected by the axial projection in the axial direction than is the case with previous embodiments of the valve train.
Unter dem Axialvorsprung wird im Rahmen dieser Beschreibung Under the axial projection is in the context of this description
insbesondere ein Vorsprung verstanden, der an einer Umfangsposition bezüglich der Drehachse der Grundnockenwelle eine maximale Erstreckung in axialer Richtung aufweist und beidseitig dieser Umfangsposition mit einer Erstreckung in axialer Richtung ausgestaltet ist, die kleiner ist als die maximale Erstreckung. Der Axialvorsprung liegt insoweit beispielsweise in Form einer bauchigen Erhebung in axialer Richtung vor. Mit einer solchen Ausgestaltung der Kulissenbahn wird eine unvollständige Verschiebung des Nockenträgers wirkungsvoll vermieden. Bei einem derartigen unvollständigen Verlagern kann es zu Kantenträgern in particular understood a projection which has a maximum extent in the axial direction at a circumferential position with respect to the axis of rotation of the base camshaft and on both sides of this circumferential position is designed with an extension in the axial direction, which is smaller than the maximum extent. The axial projection is so far, for example, in the form of a bulbous elevation in the axial direction. With such a design of the slide track incomplete displacement of the cam carrier is effectively avoided. With such an incomplete displacement, it can lead to edge carriers
beziehungsweise zu schräg gestellten Rollenschlepphebeln kommen, wobei die Gefahr des Umfallens beziehungsweise einer unzulässig hohen come to oblique role Schlepphebeln, the risk of falling over or an inadmissible high
Flächenpressung besteht. Ein Grund für eine unvollständige Verschiebung kann beispielsweise erhöhte Reibung zwischen dem Nockenträger und der Grundnockenwelle, insbesondere zwischen einer Außenverzahnung der Grundnockenwelle und einer in diese eingreifende Innenverzahnung des Nockenträgers sein. Auch durch das Anliegen des Rollenschlepphebels an dem Ventilbetätigungsnocken kann erhöhte Reibung auftreten.  Surface pressure exists. One reason for an incomplete displacement, for example, increased friction between the cam carrier and the base camshaft, in particular between an outer toothing of the base camshaft and an engaging in this internal toothing of the cam carrier. Also by the concern of the roller cam follower on the valve actuating cam increased friction can occur.
Die beschriebene Ausgestaltung der Kulissenbahn ist insbesondere sinnvoll, wenn dem Nockenträger beziehungsweise der Schaltkulisse eine The described embodiment of the slide track is particularly useful when the cam carrier or the shift gate a
Rastvorrichtung zugeordnet ist, die den Nockenträger in jeweils einer von mehreren Axialpositionen rastend hält. Insbesondere hält die Rastvorrichtung den Nockenträger in jeder der mehreren Axialpositionen. Beispielsweise sind wenigstens zwei, insbesondere genau zwei voneinander verschiedene Axialpositionen vorgesehen. Zum Überwinden der Rastkraft der Catch device is assigned, which holds the cam carrier in each case one of a plurality of axial positions detent. In particular, the latching device holds the cam carrier in each of the plurality of axial positions. For example, at least two, in particular exactly two mutually different axial positions are provided. To overcome the cogging force of
Rastvorrichtung zum Wechseln der Axialposition muss eine bestimmte Kraft aufgebracht werden. Dies wird mit Hilfe des Aktuators erzielt. Reicht jedoch der mittels des Aktuators bewirkte Impuls nicht aus, so erreicht der Detent device for changing the axial position, a certain force must be applied. This is achieved with the help of the actuator. However, if the momentum generated by the actuator is insufficient, it will reach
Nockenträger nicht die gewünschte Axialposition, was in dem vorstehend beschriebenen unvollständigen Verlagern resultiert. Cam carrier does not have the desired axial position, resulting in the incomplete displacement described above.
Es ist vorgesehen, dass beide Kulissenbahnen jeweils einen Axialvorsprung in Richtung der die jeweils andere der Kulissenbahnen in axialer Richtung begrenzende Kulissenbahnwand aufweist. Das Problem des unvollständigen Verlagerns wird insoweit nicht lediglich für eine der Kulissenbahnen, sondern vielmehr für beide Kulissenbahnen effektiv beseitigt. Bevorzugt weisen die Axialvorsprünge dabei dieselben Abmessungen auf, insbesondere dieselbe Axialerstreckung, insbesondere also dieselbe maximale Axialerstreckung, und/oder dieselbe Erstreckung in Umfangsrichtung. Durch den Axialvorsprung beziehungsweise die beiden Axialvorsprünge wird jedoch die Breite der Kulissenbahnen verringert beziehungsweise bei vorgegebener Breite der Kulissenbahnen der Nockenträger verbreitert. It is envisaged that both slide tracks each have an axial projection in the direction of the other of the slide tracks in the axial direction limiting link track wall. The problem of incomplete displacement is thus far removed not only for one of the slide tracks, but rather for both slide tracks effectively. Preferably, the Axial projections while the same dimensions, in particular the same axial extent, ie in particular the same maximum axial extent, and / or the same extent in the circumferential direction. By the axial projection or the two axial projections, however, the width of the slide tracks is reduced or widened for a given width of the slide tracks of the cam carrier.
Letzteres ist grundsätzlich aufgrund des vorgegebenen Bauraums  The latter is basically due to the given space
unerwünscht. Ersteres führt dazu, dass der Ventiltrieb schwierig herzustellen , ist, weil unter Umständen die Kulissenbahnen, insbesondere in demjenigen undesirable. The former causes the valve train is difficult to produce, because under certain circumstances, the slide tracks, especially in that
Bereich, in welchem sie die gemeinsame Kulissenbahn ausbilden, zu schmal sind, um sie mit demselben Fräswerkzeug herzustellen, welcher für die weiteren Bereiche der Kulissenbahnen verwendet wird. Schließlich ist vorgesehen, dass die Axialvorsprünge der Kulissenbahnen in Umfangsrichtung gegeneinander versetzt angeordnet sind. Das bedeutet vorzugsweise, dass die Umfangspositionen, an welchen die Axialvorsprünge jeweils ihre größte Erstreckung in axialer Richtung aufweisen, in Area in which they form the common slide track are too narrow to produce them with the same milling tool, which is used for the other areas of the slide tracks. Finally, it is provided that the axial projections of the slide tracks are arranged offset from each other in the circumferential direction. This preferably means that the circumferential positions at which the axial projections each have their greatest extent in the axial direction, in
Umfangsrichtung gegeneinander versetzt sind. Bei einer  Circumferential direction are offset from each other. At a
gegenüberliegenden Anordnung der Axialvorsprünge tritt jedoch erneut das Problem zutage, dass die Kulissenbahnen unter Umständen zu schmal für das verwendete Fräswerkzeug sind. Aus diesem Grund ist es besonders vorteilhaft, wenn die Axialvorsprünge gegeneinander versetzt angeordnet sind, also einander in Umfangsrichtung nicht gegenüberliegen.  However, the opposing arrangement of the axial projections again reveals the problem that the slide tracks may be too narrow for the milling tool used. For this reason, it is particularly advantageous if the axial projections are arranged offset from one another, so do not face each other in the circumferential direction.
Eine Weiterbildung der Erfindung sieht vor, dass der Versatz der A development of the invention provides that the offset of the
Axialvorsprünge derart gewählt ist, dass die kleinste Entfernung zwischen den Axialvorsprüngen zumindest eine Breite der Kulissenbahnen entspricht. Die kleinste Entfernung zwischen den Axialvorsprüngen ist vorzugsweise definiert als die Länge derjenigen geraden Linie, welche die Axialvorsprünge beziehungsweise diejenigen Umfangspositionen, an welchen die Axial projections is chosen such that the smallest distance between the axial projections corresponds to at least a width of the slide tracks. The smallest distance between the axial projections is preferably defined as the length of that straight line which the axial projections or those circumferential positions on which the
Axialvorsprünge ihre jeweils größte Erstreckung in axialer Richtung aufweisen, miteinander verbindet. Diese kleinste Entfernung soll wenigstens der Breite der Kulissenbahnen entsprechen, wobei die Kulissenbahnen üblicherweise dieselbe Breite aufweisen. Selbstverständlich kann die kleineste Entfernung zwischen den Axialvorsprüngen jedoch auch größer sein als die Breite der Kulissenbahnen. Axial projections have their greatest extent in the axial direction, connects to each other. This smallest distance should at least correspond to the width of the slide tracks, wherein the slide tracks usually have the same width. Of course, the smallest distance between the axial projections but also be greater than the width of the slide tracks.
In einer weiteren bevorzugten Ausgestaltung der Erfindung ist vorgesehen, dass die Kulissenbahnen vor der Mündungsstelle separat voneinander und nach der Mündungsstelle in Form einer gemeinsamen Kulissenbahn verlaufen, wobei in der gemeinsamen Kulissenbahn eine Ausschubrampe ausgebildet ist. Auf eine derartige Ausgestaltung wurde vorstehend bereits hingewiesen. In Umfangsrichtung gesehen vor der Mündungsstelle liegen die Kulissenbahnen beabstandet voneinander vor, das bedeutet, dass die sie ausbildenden Vertiefungen an derselben Umfangsposition nicht ineinander übergehen. In a further preferred embodiment of the invention, it is provided that the guide tracks run separately from each other and after the discharge point in the form of a common slide track before the discharge point, wherein in the common slide track a Ausschubrampe is formed. On such a configuration has already been mentioned above. Seen in the circumferential direction in front of the mouth point, the slide tracks are spaced apart from each other, which means that the depressions forming them do not merge into one another at the same circumferential position.
An der Mündungsstelle treffen die Kulissenbahnen erstmals aufeinander beziehungsweise gehen ineinander über. In Umfangsrichtung nach der Mündungsstelle verlaufen die Kulissenbahnen gemeinsam, sodass sie die gemeinsame Kulissenbahn ausbilden. In letztere ist die Ausschubrampe vorgesehen, welche sich insbesondere durch einen in die von der At the estuary, the slide tracks meet each other for the first time or merge into each other. In the circumferential direction after the mouth point, the slide tracks run together, so that they form the common slide track. In the latter, the Ausschubrampe is provided, which in particular by a in the of
Mündungsstelle abgewandte Richtung abnehmende Tiefe der Facing away the direction of decreasing depth
Kulissenbahnen beziehungsweise eine wachsende Entfernung eines Grunds der Kulissenbahnen auszeichnet. Für ein Verlagern des Nockenträgers greift der Mitnehmer vor der Mündungsstelle in eine der Kulissenbahnen ein und durchläuft diese bis zu der Mündungsstelle. Nachfolgend durchläuft er die gemeinsame Kulissenbahn und wird durch die Ausschubrampe in radialer Richtung nach außen gedrängt, sodass er nach dem Durchlaufen der gemeinsamen Kulissenbahn vorzugsweise wieder in seiner Ausgangsposition vorliegt. Kulissenbahnen or a growing distance of a reason of the slide tracks is characterized. For a displacement of the cam carrier, the driver engages in front of the discharge point in one of the slide tracks and passes through them to the discharge point. He then passes through the common slide track and is urged by the Ausschubrampe in the radial direction to the outside, so that he after passing through the common slide path is preferably present again in its starting position.
In einer weiteren bevorzugten Ausgestaltung der Erfindung ist vorgesehen, dass die Axialvorsprünge in der gemeinsamen Kulissenbahn vorliegen. Bevorzugt liegt zumindest diejenige Umfangsposition, an welcher der Axialvorsprung beziehungsweise die Axialvorsprünge ihre größte In a further preferred embodiment of the invention, it is provided that the axial projections are present in the common slide track. Preferably, at least that circumferential position at which the axial projection or the axial projections is their largest
Erstreckung in axialer Richtung aufweisen, - in Umfangsrichtung gesehen - in der gemeinsamen Kulissenbahn oder in der Mündungsstelle. Have extension in the axial direction, - seen in the circumferential direction - in the common slide track or in the discharge point.
Eine weitere Ausgestaltung der Erfindung sieht vor, dass die A further embodiment of the invention provides that the
Axialerstreckungen der Axialvorsprünge derart gewählt sind, dass der jeweilige Axialvorsprung an der Stelle seiner maximalen axialen Erstreckung in axialer Richtung um eine Entfernung von einer Längsmittelbahn der gemeinsamen Kulissenbahn beabstandet ist, die mindestens der Hälfte der axialen Erstreckung eines Mitnehmers des Aktuators entspricht. Die Axialerstreckungen the axial projections are chosen such that the respective axial projection is spaced at the location of its maximum axial extent in the axial direction by a distance from a longitudinal center line of the common link path, which corresponds to at least half of the axial extent of a driver of the actuator. The
Längsmittelbahn entspricht beispielsweise der vorstehend bereits erläuterten Kurvenbahn, welche stets in der Mitte der jeweiligen Kulissenbahn verläuft. Beispielsweise verläuft die Längsmittelbahn jeder Kulissenbahn in axialer Richtung mittig in der Kulissenbahn und auf deren Grund. For example, the longitudinal center line corresponds to the curved path already explained above, which always runs in the middle of the respective slide track. For example, the longitudinal center line of each slide track runs in the axial direction in the center of the slide track and on the bottom.
Vorzugsweise entspricht die Entfernung des Axialvorsprungs von der Längsmittelachse genau der Hälfte der axialen Erstreckung des Mitnehmers. Das bedeutet, dass der Mitnehmer bei dem Durchlaufen der Kulissenbahn von dem Axialvorsprung derart ausgelenkt wird, dass er nach dem Preferably, the distance of the axial projection from the longitudinal center axis corresponds exactly to half the axial extent of the driver. This means that the driver is deflected in passing through the slide track of the axial projection so that it after the
Axialvorsprung - in axialer Richtung gesehen - in etwa mittig, vorzugsweise genau mittig, in der Kulissenbahn, beziehungsweise der gemeinsamen Kulissenbahn angeordnet ist. Insbesondere sind beide Axialvorsprünge beziehungsweise deren Axialerstreckungen entsprechend gewählt, sodass der Mitnehmer unabhängig davon, welche Kulissenbahn er durchläuft, in Umfangsrichtung nah dem Axialvorsprung in axialer Richtung mittig in der Kulissenbahn vorliegt. Axial projection - seen in the axial direction - approximately centrally, preferably exactly centered, in the slide track, or the common slide track is arranged. In particular, both axial projections or their axial extensions are selected accordingly, so that the driver regardless of which slide track he goes through, in Circumferential direction is close to the axial projection in the axial direction centrally in the slide track.
In einer weiteren Ausgestaltung der Erfindung ist vorgesehen, dass Nuttiefen der Kulissenbahnen an gleichen Umfangspositionen gleich sind. Unter der Nuttiefe ist vorzugsweise der Abstand zwischen einem Grund der jeweiligen Kulissenbahn und einem Außenumfang der Schaltkulisse zu verstehen. Je geringer also die Nuttiefe ist, umso größer ist der Abstand zwischen der Drehachse der Grundnockenwelle und dem Grund der Kulissenbahn in radialer Richtung. Die gleichen Nuttiefen der Kulissenbahnen an gleichen Umfangspositionen haben den Vorteil, dass der Grund einer der In a further embodiment of the invention it is provided that groove depths of the slide tracks are the same at the same circumferential positions. Under the groove depth is preferably the distance between a base of the respective slide track and an outer periphery of the shift gate to understand. The lower the groove depth, the greater the distance between the axis of rotation of the base camshaft and the base of the slide track in the radial direction. The same groove depths of the slide tracks at the same circumferential positions have the advantage that the reason of one of
Kulissenbahnen ohne Absatz in radialer Richtung in den Grund der anderen Kulissenbahn übergeht, sodass also der Grund beziehungsweise der Boden der gemeinsamen Kulissenbahn stetig beziehungsweise ohne Sprung in radialer Richtung ausgebildet ist. Sliding link without paragraph in the radial direction into the bottom of the other slide track passes, so that therefore the reason or the bottom of the common slide track is formed continuously or without leaps in the radial direction.
Schließlich kann in einer weiteren Ausgestaltung der Erfindung vorgesehen sein, dass die Nuttiefe ab einer Stelle der größten Axialerstreckung desjenigen Axialvorsprungs zur Bildung der Ausschubrampe abnimmt, der in Umfangsrichtung vorne liegt. Wie bereits erläutert, sorgt die Ausschubrampe für ein Ausschieben des Mitnehmers in radialer Richtung aus der Finally, it can be provided in a further embodiment of the invention that the groove depth decreases from a point of greatest axial extent of that axial projection to form the Ausschubrampe, the front is in the circumferential direction. As already explained, the Ausschubrampe ensures a pushing out of the driver in the radial direction of the
Kulissenbahn beziehungsweise den Kulissenbahnen. Zu diesem Zweck soll die Nuttiefe im Bereich der Ausschubrampe abnehmen, vorzugsweise stetig abnehmen. Insbesondere beginnt die Ausschubrampe und mithin das Abnehmen der Nuttiefe in Umfangsrichtung gesehen bereits ab derjenigen Umfangsposition, an welcher die größte Axialerstreckung des Sliding track or the slide tracks. For this purpose, the groove depth should decrease in the region of the Ausschubrampe, preferably steadily decrease. In particular, the Ausschubrampe and thus the decrease in the groove depth in the circumferential direction begins already from that circumferential position at which the largest axial extent of the
Axialvorsprungs vorliegt. Axial projection exists.
Sind mehrere Axialvorsprünge vorhanden, welche zudem in Are several axial projections present, which also in
Umfangsrichtung gegeneinander versetzt angeordnet sind, so kann das Abnehmen der Nuttiefe bereits ab dem in Umfangsrichtung vorne liegenden Axialvorsprung vorgesehen sein, also demjenigen Axialvorsprung, welcher der gemeinsamen Kulissenbahn abgewandt ist. Selbstverständlich ist alternativ auch ein Beginn der Abnahme der Nuttiefe ab demjenigen Circumferentially arranged offset from each other, so that can Removing the groove depth already be provided from the front lying in the circumferential direction axial projection, ie that axial projection, which faces away from the common link path. Of course, alternatively, a beginning of the decrease of the groove depth is from that
Axialvorsprung realisierbar, welcher in Umfangsrichtung hinten liegt. Axial projection feasible, which is behind in the circumferential direction.
Die Erfindung betrifft weiterhin eine Brennkraftmaschine mit einem The invention further relates to an internal combustion engine with a
Ventiltrieb, insbesondere gemäß den vorstehenden Ausführungen, wobei der Ventiltrieb wenigstens eine Grundnockenwelle aufweist, auf der drehfest und zwischen wenigstens zwei Axialpositionen axial verlagerbar mindestens ein Ventilbetätigungsnocken aufweisender Nockenträger vorgesehen ist, wobei dem Nockenträger zum axialen Verlagern mittels eines Aktuators eine Schaltkulisse zugeordnet ist, welche an ihrem Umfang zwei in axialer Valve gear, in particular according to the preceding embodiments, wherein the valve train has at least one base camshaft on the rotatably and axially displaceable between at least two axial positions at least one Ventilbetätigungsnocken exhibiting cam carrier is provided, wherein the cam carrier for axial displacement by means of an actuator associated with a shift gate, which its circumference two in axial
Richtung gegenläufige, teilweise voneinander beabstandete, an einer Mündungsstelle ineinander einmündende Kulissenbahnen aufweist, wobei beide Kulissenbahnen jeweils einen Axialvorsprung in Richtung einer die jeweils andere der Kulissenbahnen in axialer Richtung begrenzenden Direction counter-rotating, partially spaced, at an opening point into each other merging gate tracks, both link paths each having an axial projection in the direction of the other of the link tracks in the axial direction limiting
Kulissenbahnwand aufweist. Dabei ist vorgesehen, dass die Axialvorsprünge der Kulissenbahnen in Umfangsrichtung gegeneinander versetzt angeordnet sind. Kulissenbahnwand has. It is provided that the axial projections of the slide tracks are arranged offset from one another in the circumferential direction.
Auf die Vorteile einer derartigen Ausgestaltung der Brennkraftmaschine beziehungsweise des Ventiltriebs wurde bereits hingewiesen. Sowohl die Brennkraftmaschine als auch der Ventiltrieb können gemäß den On the advantages of such an embodiment of the internal combustion engine or the valve train has already been noted. Both the internal combustion engine and the valve train can according to the
vorstehenden Ausführungen weitergebildet sein, sodass insoweit auf diese verwiesen wird. be further developed above, so that reference is made to this extent.
Die Erfindung wird nachfolgend anhand der in der Zeichnung dargestellten Ausführungsbeispiele näher erläutert, ohne dass eine Beschränkung der Erfindung erfolgt. Dabei zeigt: Figur 1 einen Bereich einer Brennkraftmaschine, nämlich eine The invention will be explained in more detail with reference to the embodiments illustrated in the drawings, without any limitation of the invention. Showing: Figure 1 shows a portion of an internal combustion engine, namely a
Schaltkulisse eines Ventiltriebs, und  Shift gate of a valve train, and
Figur 2 eine schematische Darstellung der Verläufe von Figure 2 is a schematic representation of the courses of
Kulissenbahnen der Schaltkulisse.  Sliding linkages of the shift gate.
Die Figur 1 zeigt einen Bereich einer Brennkraftmaschine 1 , insbesondere eines Ventiltriebs 2. Konkret ist eine Schaltkulisse 3 gezeigt, die auf einer Grundnockenwelle 4 des Ventiltriebs 2 in axialer Richtung verlagerbar angeordnet ist. Beispielsweise weist die Schaltkulisse 3 zu diesem Zweck eine Innenverzahnung auf, welche in eine Außenverzahnung der FIG. 1 shows a region of an internal combustion engine 1, in particular a valve drive 2. Specifically, a shift gate 3 is shown, which is arranged so as to be displaceable in the axial direction on a base camshaft 4 of the valve drive 2. For example, the shift gate 3 for this purpose an internal toothing, which in an external toothing of the
Grundnockenwelle 4 eingreift. Der Schaltkulisse 3 ist wenigstens ein hier nicht dargestellter Nockenträger zugeordnet, an welchem wenigstens ein Ventilbetätigungsnocken vorgesehen ist. Der Ventilbetätigungsnocken dient zur Betätigung wenigstens eines Gaswechselventils der BrennkraftmaschineBase camshaft 4 engages. The shift gate 3 is associated with at least one cam carrier, not shown here, on which at least one valve actuating cam is provided. The valve actuating cam is used to actuate at least one gas exchange valve of the internal combustion engine
1. 1.
Vorzugsweise sind an dem Nockenträger mehrere Ventilbetätigungsnocken vorgesehen, wobei in unterschiedlichen axialen Positionen des Preferably, a plurality of valve actuating cam are provided on the cam carrier, wherein in different axial positions of the
Nockenträgers unterschiedliche Ventilbetätigungsnocken zur Betätigung des Gaswechselventils dienen. Der Nockenträger ist mittels der Schaltkulisse 3 in axialer Richtung verlagerbar. Zu diesem Zweck verfügt der Ventiltrieb 2 über einen Aktuator 5 mit einem Mitnehmer 6. Der Aktuator 5 ist derart Cam carrier different valve actuation cam serve to actuate the gas exchange valve. The cam carrier is displaceable by means of the shift gate 3 in the axial direction. For this purpose, the valve drive 2 has an actuator 5 with a driver 6. The actuator 5 is such
ausgebildet, dass der Mitnehmer 6 in radialer Richtung bezüglich einer Drehachse 7 der Grundnockenwelle 4 verlagerbar ist. Dargestellt ist er einmal mit durchgezogenen Linien in einer Ausgangsposition sowie mit gestrichelten Linien in einer ausgefahrenen Position. designed, that the driver 6 in the radial direction with respect to a rotation axis 7 of the base camshaft 4 is displaced. It is shown once with solid lines in a starting position and dashed lines in an extended position.
Die Schaltkulisse 3 verfügt über eine erste Kulissenbahn 8 sowie eine zweite Kulissenbahn 9. Jede der Kulissenbahnen 8 und 9 wird von einer Längsmittelbahn 10 beziehungsweise 11 definiert, welche in axialer Richtung gesehen mittig in der jeweiligen Kulissenbahn 8 beziehungsweise 9 verläuft. Die Kulissenbahnen 8 und 9 gehen an einer Mündungsstelle 12 ineinander über. Die Mündungsstelle 12 kann durch denjenigen Punkt 13 definiert sein, an welchem die Längsmittelbahnen 10 und 11 ineinander übergehen. The shift gate 3 has a first slide track 8 and a second slide track 9. Each of the slide tracks 8 and 9 is of a Longitudinal center line 10 and 11 defined, which in the axial direction seen centrally in the respective slide track 8 and 9, respectively. The slide tracks 8 and 9 merge into each other at an outlet point 12. The mouth 12 can be defined by the point 13 at which the longitudinal center lines 10 and 11 merge into each other.
Alternativ kann unter der Mündungsstelle 12 auch diejenige Umfangsposition verstanden werden, an welcher erstmalig eine zwischen den Kulissenbahnen 8 und 9 vorliegende Trennwand 14 entfällt. Es wird deutlich, dass die Kulissenbahnen 8 und 9 vor der Mündungsstelle 12 voneinander beabstandet sind, insbesondere liegt zwischen ihnen die Trennwand 14 vor. Weil sie jedoch in axialer Richtung gegenläufig  Alternatively, the peripheral point 12 can also be understood as that peripheral position at which a dividing wall 14 present between the slide tracks 8 and 9 is omitted for the first time. It is clear that the slide tracks 8 and 9 are spaced from each other before the discharge point 12, in particular between them the partition wall 14 before. Because they are in the opposite direction in the axial direction
ausgestaltet sind, laufen sie aufeinander zu, sodass sie an der designed, they run towards each other, so they at the
Mündungsstelle 12 ineinander einmünden. Nach der Mündungsstelle 12 laufen sie in Form einer gemeinsamen Kulissenbahn 15 weiter. Auch diese ist wiederum charakterisiert durch den Verlauf der Längsmittelbahnen 10 und 11 , welche nunmehr überdeckend verlaufen. In axialer Richtung nach außen sind die Kulissenbahnen 8 und 9 jeweils durch eine Kulissenbahnwand 16 beziehungsweise 17 begrenzt. Outlet point 12 merge into each other. After the confluence point 12 they continue in the form of a common slide track 15 on. Again, this is characterized by the course of the longitudinal center lines 10 and 11, which now extend overlapping. In the axial direction to the outside, the slide tracks 8 and 9 are each bounded by a slide track wall 16 and 17 respectively.
Soll die Schaltkulisse 3 und mithin der wenigstens eine Nockenträger in axialer Richtung verlagert werden, so wird der Aktuator 5 derart angesteuert, dass der Mitnehmer 6 in radialer Richtung ausgefahren, also in Richtung der Grundnockenwelle 4 verlagert wird. Entsprechend greift er in eine der Kulissenbahnen 8 und 9 (hier: die erste Kulissenbahn 8) ein. Weil die If the shift gate 3 and consequently the at least one cam carrier are to be displaced in the axial direction, then the actuator 5 is actuated in such a way that the driver 6 is extended in the radial direction, ie is displaced in the direction of the base camshaft 4. Accordingly, he intervenes in one of the slide tracks 8 and 9 (here: the first slide track 8). Because the
Schaltkulisse 3 von der Grundnockenwelle 3 in Umfangsrichtung angetrieben wird, durchläuft der Mitnehmer 6 die Kulissenbahn 8 in Richtung der gemeinsamen Kulissenbahn 15. Dabei liegt er zumindest teilweise an der Kulissenbahnwand 16 an, wodurch die Schaltkulisse 3 und mithin auch der Nockenträger in axialer Richtung verlagert wird. Es ist nun vorgesehen, dass zumindest eine der Kulissenbahnen 8 und 9, in dem hier dargestellten Ausführungsbeispiel beide Kulissenbahnen 8 und 9, einen Axialvorsprung 18 beziehungsweise 19 aufweisen. Dieser ragt in Richtung der die jeweils andere der Kulissenbahnen 9 beziehungsweise 8 in axialer Richtung begrenzenden Kulissenbahnwand 17 beziehungsweise 16. Der Axialvorsprung 18 beziehungsweise 9 ist dabei derart ausgestaltet, dass seine Erstreckung in axialer Richtung der die jeweils andere Shift gate 3 is driven by the base camshaft 3 in the circumferential direction, the driver 6 passes through the slide track 8 in the direction of the common slide track 15. At least partially it is against the slide track wall 16, whereby the shift gate 3 and therefore also the cam carrier is displaced in the axial direction , It is now provided that at least one of the slide tracks 8 and 9, in the embodiment shown here both slide tracks 8 and 9, an axial projection 18 and 19 respectively. This protrudes in the direction of the other of the slide tracks 9 and 8 in the axial direction limiting link track wall 17 and 16. The axial projection 18 and 9 is designed such that its extension in the axial direction of the other
Kulissenbahn 9 beziehungsweise 8 begrenzende Kulissenbahnwand 17 beziehungsweise 16 zunächst stets größer wird, bis eine maximale Gate track 9 and 8 limiting backdrop path wall 17 and 16 initially always gets bigger, to a maximum
Axialerstreckung erreicht ist. In Umfangsrichtung nach derjenigen Axial extent is reached. In the circumferential direction after that
Umfangsposition, an welcher diese maximale Axialerstreckung vorliegt, nimmt die Axialerstreckung wieder ab.  The circumferential position at which this maximum axial extent is present decreases the axial extent again.
Das bedeutet im Falle des hier dargestellten Ausführungsbeispiels, dass die Breite der Kulissenbahnen 8 und 9 beziehungsweise der gemeinsamen Kulissenbahn 15 nach der Umfangsposition, an welcher die maximale Axialerstreckung vorliegt, zunimmt beziehungsweise die Axialerstreckung des Axialvorsprungs 18 beziehungsweise 19 wieder abnimmt. In dem hier dargestellten Ausführungsbeispiel sind die Axialvorsprünge 18 und 19 in Umfangsrichtung gegenüberliegend angeordnet. Darunter ist vorzugsweise zu verstehen, dass die Umfangspositionen, an welchen sie ihre maximale Axialerstreckung aufweisen, übereinstimmen. This means in the case of the embodiment shown here, that the width of the slide tracks 8 and 9 and the common slide track 15 after the circumferential position at which the maximum axial extension is present increases or decreases the axial extent of the axial projection 18 and 19 again. In the embodiment shown here, the axial projections 18 and 19 are arranged opposite in the circumferential direction. By this is preferably to be understood that the circumferential positions at which they have their maximum axial extent match.
Eine derartige Ausgestaltung stellt zwar einen vergrößerten Although such an embodiment provides an enlarged
Verlagerungsweg der Schaltkulisse 3 sicher. Im Vergleich zu anderenDisplacement path of the shift gate 3 safe. Compared to other
Ausführungen der Schaltkulisse 3 ist die gemeinsame Kulissenbahn 15 in axialer Richtung jedoch schmal, sodass eine Herstellung der gemeinsamen Kulissenbahn 15 unter Umständen nicht mit demselben Fräswerkzeug erfolgen kann, wie die Herstellung der Kulissenbahnen 8 und 9 in Executions of the shift gate 3 is the common slide track 15 in the axial direction, however, narrow, so that a production of the common slide track 15 may not be done with the same milling tool under certain circumstances, as the production of slide tracks 8 and 9 in
Umfangsrichtung vor der Mündungsstelle 12. Aus diesem Grund ist es besonders bevorzugt, wenn die Axialvorsprünge 18 und 19 in Circumferential direction before the confluence point 12. For this reason it is particularly preferred when the axial projections 18 and 19 in
Umfangsrichtung gegeneinander versetzt angeordnet sind. Circumferentially arranged offset from each other.
Dies wird anhand der Figur 2 verdeutlicht. Dort sind schematisch Verläufe der Kulissenbahnen 8 und 9 dargestellt, wobei zudem rein beispielhaft mehrere Positionen des Mitnehmers 6 angedeutet sind. In der hier This will be clarified with reference to FIG. There, curves of the slide tracks 8 and 9 are shown schematically, wherein also purely exemplary, several positions of the driver 6 are indicated. In the here
dargestellten Ausführungsform liegt die Umfangsposition der maximalen Axialerstreckung der zweiten Kulissenbahn 9 an einer Umfangsposition, an welcher der Axialvorsprung 18 gerade nicht mehr vorliegt. Selbstverständlich kann die Umfangsposition der maximalen Axialerstreckung auch in illustrated embodiment, the circumferential position of the maximum axial extent of the second cam track 9 at a circumferential position at which the axial projection 18 is no longer present. Of course, the circumferential position of the maximum axial extent in
Umfangsrichtung nach dem Axialvorsprung 18 angeordnet sein. Circumferential direction can be arranged after the axial projection 18.
Die Axialvorsprünge 18 und 19 sind derart ausgestaltet beziehungsweise ist ihr Versatz in Umfangsrichtung derart gewählt, dass die kleinste Entfernung 20 zwischen den Axialvorsprüngen 18 und 19 zumindest einer Breite 21 der Kulissenbahnen 8 und 9 entspricht. Vorzugsweise weisen diese dieselbe Breite auf. Zusätzlich kann es vorgesehen sein, dass der kleinste Abstand 22 in axialer Richtung zwischen den Axialvorsprüngen 18 und 19 derart bemessen ist, dass er zumindest einer Axialerstreckung 23 des Mitnehmers 6 entspricht. Insbesondere ist der Abstand 22 genau so groß wie die The axial projections 18 and 19 are configured or their offset in the circumferential direction is selected such that the smallest distance 20 between the axial projections 18 and 19 at least one width 21 of the slide tracks 8 and 9 corresponds. Preferably, they have the same width. In addition, it may be provided that the smallest distance 22 in the axial direction between the axial projections 18 and 19 is dimensioned such that it corresponds to at least one axial extension 23 of the driver 6. In particular, the distance 22 is just as great as the
Erstreckung 23 oder allenfalls geringfügig größer. Extension 23 or at most slightly larger.
Bedingt durch die Wahl der Entfernung 20, welche zumindest der Breite 21 der Kulissenbahnen 8 und 9 entsprechen soll, ist eine einfache Fertigung der Kulissenbahnen 8 und 9 möglich. Dabei kann die gemeinsame Kulissenbahn 15 mit demselben Fräswerkzeug ausgebildet werden wie die Kulissenbahnen 8 und 9. Due to the choice of the distance 20, which should correspond to at least the width 21 of the slide tracks 8 and 9, a simple production of the slide tracks 8 and 9 is possible. In this case, the common slide track 15 can be formed with the same milling tool as the slide tracks 8 and 9.

Claims

Patentansprüche claims
1. Ventiltrieb (2) für eine Brennkraftmaschine (1 ), mit wenigstens einer Grundnockenwelle (4), auf der drehfest und zwischen wenigstens zwei1. Valve train (2) for an internal combustion engine (1), with at least one base camshaft (4) on the rotationally fixed and between at least two
Axialpositionen axial verlagerbar mindestens ein Ventilbetätigungsnocken aufweisender Nockenträger vorgesehen ist, wobei dem Nockenträger zum axialen Verlagern mittels eines Aktuators (5) eine Schaltkulisse (3) Axialpositionen axially displaceable at least one cam actuating cam exhibiting cam carrier is provided, wherein the cam carrier for axial displacement by means of an actuator (5) a shift gate (3)
zugeordnet ist, welche an ihrem Umfang zwei in axialer Richtung is assigned, which at its periphery two in the axial direction
gegenläufige, teilweise voneinander beabstandete, an einer Mündungsstelle (12) ineinander einmündende Kulissenbahnen (8,9) aufweist, wobei beide Kulissenbahnen (8,9) jeweils einen Axialvorsprung (18,19) in Richtung einer die jeweils andere der Kulissenbahnen (9,8) in axialer Richtung begrenzende Kulissenbahnwand (16,17) aufweisen, dadurch gekennzeichnet, dass die Axialvorsprünge (18,19) der Kulissenbahnen (8,9) in Umfangsrichtung gegeneinander versetzt angeordnet sind. has opposing, partially spaced, at a confluence point (12) merging into each other slide tracks (8,9), wherein both slide tracks (8,9) each have an axial projection (18,19) in the direction of one of the other of the slide tracks (9,8 ) in the axial direction limiting link path wall (16,17), characterized in that the axial projections (18,19) of the slide tracks (8,9) are arranged offset from one another in the circumferential direction.
2. Ventiltrieb nach Anspruch 1 , dadurch gekennzeichnet, dass der Versatz der Axialvorsprünge (18,19) derart gewählt ist, dass die kleinste Entfernung (20) zwischen den Axialvorsprüngen (18,19) zumindest einer Breite (21 ) der Kulissenbahnen (8,9) entspricht. 2. Valve drive according to claim 1, characterized in that the offset of the axial projections (18,19) is selected such that the smallest distance (20) between the axial projections (18,19) at least one width (21) of the slide tracks (8, 9) corresponds.
3. Ventiltrieb nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Kulissenbahnen (8,9) vor der Mündungsstelle (12) separat voneinander und nach der Mündungsstelle (12) in Form einer gemeinsamen Kulissenbahn (15) verlaufen, wobei in der gemeinsamen Kulissenbahn (15) eine Ausschubrampe ausgebildet ist. 3. Valve drive according to one of the preceding claims, characterized in that the slide tracks (8,9) in front of the discharge point (12) separately from each other and after the discharge point (12) in the form of a common slide track (15), wherein in the common slide track (15) a Ausschubrampe is formed.
4. Ventiltrieb nach Anspruch 3, dadurch gekennzeichnet, dass die Axialvorsprünge (18,19) in der gemeinsamen Kulissenbahn (15) vorliegen. 4. Valve drive according to claim 3, characterized in that the axial projections (18,19) in the common slide track (15) are present.
5. Ventiltrieb nach Anspruch 3 oder 4, dadurch gekennzeichnet, dass die Axialerstreckungen der Axialvorsprünge (18,19) derart gewählt sind, dass der jeweilige Axialvorsprung (18,19) an der Stelle seiner maximalen 5. Valve drive according to claim 3 or 4, characterized in that the axial extensions of the axial projections (18,19) are selected such that the respective axial projection (18,19) at the location of its maximum
Axialerstreckung in axialer Richtung um eine Entfernung von einer Axial extension in the axial direction by a distance of one
Längsmittelbahn (10,11 ) der gemeinsamen Kulissenbahn (15) beabstandet ist, die mindestens der Hälfte der axialen Erstreckung (23) eines Mitnehmers (6) des Aktuators (5) entspricht. Longitudinal center line (10,11) of the common slide track (15) is spaced, which corresponds to at least half of the axial extent (23) of a driver (6) of the actuator (5).
6. Ventiltrieb nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass Nuttiefen der Kulissenbahnen (8,9) an gleichen6. Valve drive according to one of the preceding claims, characterized in that groove depths of the slide tracks (8,9) on the same
Umfangspositionen gleich sind. Circumferential positions are the same.
7. Ventiltrieb nach einem der Ansprüche 3 bis 6, dadurch 7. Valve gear according to one of claims 3 to 6, characterized
gekennzeichnet, dass die Nuttiefe ab einer Stelle der größten axialen Erstreckung desjenigen Axialvorsprungs (18,19) zur Bildung der characterized in that the groove depth from a point of greatest axial extent of that axial projection (18,19) to form the
Ausschubrampe abnimmt, der in Umfangsrichtung vorne liegt. Ausschubrampe decreases, which lies in the circumferential direction forward.
8. Brennkraftmaschine (1 ) mit einem Ventiltrieb (2), der wenigstens eine Grundnockenwelle (4) aufweist, auf der drehfest und zwischen wenigstens zwei Axialpositionen axial verlagerbar mindestens ein 8. Internal combustion engine (1) with a valve drive (2) having at least one base camshaft (4) on the rotationally fixed and axially displaceable between at least two axial positions at least one
Ventilbetätigungsnocken aufweisender Nockenträger vorgesehen ist, wobei dem Nockenträger zum axialen Verlagern mittels eines Aktuators (5) eine Schaltkulisse (3) zugeordnet ist, welche an ihrem Umfang zwei in axialer Richtung gegenläufige, teilweise voneinander beabstandete, an einer  The cam carrier for axial displacement by means of an actuator (5) is associated with a shift gate (3), which at its circumference two in the opposite direction in the axial direction, partially spaced from one another
Mündungsstelle (12) ineinander einmündende Kulissenbahnen (8,9) aufweist, wobei beide Kulissenbahnen (8,9) jeweils einen Axialvorsprung (18,19) in Richtung einer die jeweils andere der Kulissenbahnen (9,8) in axialer Richtung begrenzten Kulissenbahnwand (16,17) aufweisen, dadurch gekennzeichnet, dass die Axialvorsprünge (18,19) der Kulissenbahnen (8,9) in Umfangsrichtung gegeneinander versetzt angeordnet sind. Opening point (12) opens into each other cam slide tracks (8,9), wherein both slide tracks (8,9) each have an axial projection (18,19) in the direction of the other of the slide tracks (9,8) limited in the axial direction of the guide track wall (16 , 17), characterized in that the axial projections (18, 19) of the slide tracks (8, 9) are offset in the circumferential direction from each other.
EP15795113.8A 2014-11-18 2015-11-10 Valve train for an internal combustion engine and corresponding internal combustion engine Active EP3221567B1 (en)

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JP6400040B2 (en) * 2016-03-31 2018-10-03 本田技研工業株式会社 Variable valve gear
DE102019125100A1 (en) * 2019-09-18 2021-03-18 Thyssenkrupp Ag Shift gate, sliding cam system and camshaft
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DE10148177B4 (en) * 2001-09-28 2015-05-13 Schaeffler Technologies AG & Co. KG Valve train with valve lift switching for the gas exchange valves of a 4-stroke internal combustion engine
DE102007010149A1 (en) * 2007-03-02 2008-09-04 Audi Ag Automotive piston engine gas valve timer has right- and left-handed grooves are located immediately alongside and translating into each other
DE102007037232A1 (en) * 2007-08-07 2009-02-12 Eto Magnetic Gmbh Device for adjusting the camshaft of an internal combustion engine
DE102008024911A1 (en) * 2008-05-23 2009-11-26 Schaeffler Kg Valve gear for internal-combustion engine, has cam shaft, which has carrier shaft and cam part, where cam part is provided with guiding element
DE102008054254A1 (en) * 2008-10-31 2010-05-06 Schaeffler Kg Camshaft for a variable-stroke valve drive of an internal combustion engine
DE102008060170A1 (en) * 2008-11-27 2010-06-02 Dr.Ing.H.C.F.Porsche Aktiengesellschaft Valve gear of an internal combustion engine
DE102011114300B4 (en) * 2011-09-23 2016-02-25 Audi Ag Valve gear of an internal combustion engine and internal combustion engine
JP5598497B2 (en) * 2012-05-08 2014-10-01 株式会社デンソー Valve lift adjustment device
DE102013111476B4 (en) * 2013-10-17 2021-09-09 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Valve drive of an internal combustion engine

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