EP3221567B1 - Ventiltrieb für eine brennkraftmaschine sowie entsprechende brennkraftmaschine - Google Patents

Ventiltrieb für eine brennkraftmaschine sowie entsprechende brennkraftmaschine Download PDF

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Publication number
EP3221567B1
EP3221567B1 EP15795113.8A EP15795113A EP3221567B1 EP 3221567 B1 EP3221567 B1 EP 3221567B1 EP 15795113 A EP15795113 A EP 15795113A EP 3221567 B1 EP3221567 B1 EP 3221567B1
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EP
European Patent Office
Prior art keywords
axial
gate
tracks
track
cam carrier
Prior art date
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EP15795113.8A
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German (de)
English (en)
French (fr)
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EP3221567A1 (de
Inventor
Matthias Ortmann
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Audi AG
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Audi AG
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Publication of EP3221567A1 publication Critical patent/EP3221567A1/de
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • 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

  • the invention relates to a valve drive for an internal combustion engine and a corresponding internal combustion engine.
  • the valve drive 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 working cycle of gas exchange valves of individual cylinders of the internal combustion engine can be influenced to improve the thermodynamic properties.
  • the at least one cam carrier which can also be referred to as a cam piece, is arranged non-rotatably and axially displaceably or displaceably on the base camshaft.
  • the cam carrier is usually assigned several, that is to say at least two, valve actuation cams.
  • Each of these valve-actuating cams has an eccentricity which is used to actuate one of the gas exchange valves of the internal combustion engine at a specific angle of rotation of the basic camshaft.
  • the valve actuating cams accordingly rotate together with the basic camshaft, so that the respective gas exchange valve of the internal combustion engine is actuated at least once per revolution of the basic camshaft by the associated valve actuating cam or its eccentricity.
  • the valve actuating cam preferably interacts with a roller rocker arm of the gas exchange valve in that it comes into abutment contact with the latter.
  • valve actuation cams are preferably provided which can be assigned to different cam groups.
  • the valve actuation cams of a cam group now differ, for example, with regard to the angular position of their eccentricity and / or the extent of the same in the radial direction (height) and / or in the circumferential direction (length), each with respect to an axis of rotation of the basic 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 of the valve actuation cams and in the second axial position by a second of the valve actuation cams which are assigned to the same group of cams.
  • the opening time, the opening duration and / or the lift of the gas exchange valve can thus be selected and set, in particular as a function of an operating state of the internal combustion engine.
  • the shifting or shifting of the cam carrier in the axial direction takes place with the aid of an actuating device which comprises the shift gate on the cam carrier and the stationary actuator, usually in a cylinder head of the internal combustion engine.
  • the actuator has an extendable driver which can be brought into engagement with a, for example, screw-shaped or spiral-shaped link path of the shift gate.
  • the slide track or slide tracks are provided on the shift gate which is assigned to the cam carrier.
  • the shift gate is formed on the cam carrier or is operatively connected to it for axial displacement.
  • the slide tracks are each located along a course of a preferably, but not necessarily continuous, curved track and have a certain width, which is preferably matched to the width of the driver of the actuator.
  • the slide track is slightly wider than the driver, so that the driver can pass through the slide track without problems.
  • the slide tracks are, for example, in the form of radial grooves which extend through the circumference of the shift gate, that is to say are designed with open edges in it.
  • the curved path is, for example, in the center of the slide path and is a line in the mathematical sense. This line can consist of several line segments. When a point on the slide track is referred to below, a point on the curved track on which the slide track is based is always meant.
  • the slide tracks run in opposite directions at least in some areas in the axial direction and merge into one another at the point of opening.
  • the slide tracks are partially spaced from one another, so do not directly merge into one another.
  • the slide tracks are arranged essentially in a Y-shape, whereby - viewed in the circumferential direction with respect to the axis of rotation of the base camshaft - the slide tracks are spaced apart from one another starting from the opening point in a first direction, but also starting from the opening point in a second direction opposite to the first direction run in the form of a common backdrop track.
  • the cam piece should be provided with a flexible guide element, which serves to form inner guide walls of the axial link that are axially movable relative to the outer guide walls and which switches between them like a switch in the area of the intersection of the link tracks, so that one of the link tracks is released for the actuating pin and the other slide track is blocked.
  • the publication also describes DE 10 2008 054 254 A1 a camshaft for a variable-lift valve drive of an internal combustion engine, with a carrier shaft and a cam piece arranged thereon in a rotationally fixed and axially displaceable manner, which is composed of a cam carrier and a sleeve, the cam carrier having a group of immediately adjacent cams with different cam lifts and a pin on which the Sleeve is attached, and wherein the sleeve has a link in the form of a groove extending over the circumference of the sleeve, which serves to specify an axial link path for a confirmation pin that moves the cam piece on the support shaft.
  • the backdrop should be produced by non-cutting shaping of sheet metal to form the sleeve.
  • the publication also describes DE 10 2013 111 476 A1 a valve drive of an internal combustion engine with a base camshaft and a cam carrier which is mounted in a rotationally fixed and axially displaceable manner and which has at least two cams for the alternative actuation of a valve.
  • At least one actuator is required to move the cam carrier provided, to which two switching curves are assigned.
  • the respective switching curve has a meshing area for the actuator, a shifting area for shifting the cam carrier by means of the actuator and an ejecting area.
  • the two switching curves intersect in their shift ranges. In this crossing area, the actuator is out of contact with the switching curves.
  • a locking mechanism is provided for locking the cam carrier in its switching positions.
  • a spring-loaded locking member of the locking mechanism is effective in a shifting position of the cam carrier in which the actuator is located in the intersection area of the switching cams that a switching force for moving the cam carrier is introduced via this locking member.
  • the document also describes DE 10 2011 114 300 A1 a valve drive of an internal combustion engine, with at least one basic camshaft, on which at least one cam carrier having valve actuation cams is provided in a rotationally fixed manner and axially displaceable between at least two axial positions, the cam carrier being assigned a shift gate for axial displacement by means of an actuator, which on its circumference over two in axial Direction of opposing, intersecting slide tracks, each having a reversal point. It is provided that the reversal points are offset from one another in the circumferential direction.
  • a valve lift adjustment device is known.
  • a slide block has a first protrusion protruding outward from a radially outer surface of the slide block at a position in a radial direction opposite to a rotational direction with respect to a first inclined surface, and a second protrusion protruding from the radially outer surface in the radial direction at a position opposite to the direction of rotation with respect to a second inclined surface protrudes outward.
  • the first protrusion or the second protrusion is adapted to push the operating component further outward in the radial direction.
  • the document also discloses DE 10 2007 010 149 A1 a valve drive for gas exchange valves of an internal combustion engine with at least one camshaft which is rotatably mounted in a housing of the internal combustion engine, at least one non-rotatable and axially displaceable cam carrier guided on the camshaft, and devices for axially moving the at least one cam carrier on the camshaft in opposite directions.
  • These devices comprise at least two engagement elements which can be brought into engagement with a right-hand or left-hand groove. To enable a reduction in the axial installation space and the number of parts to be assembled, the right-hand groove and the left-hand groove should be arranged directly next to one another and merge with one another or merge.
  • the object of the invention is to propose a valve drive for an internal combustion engine which has advantages over the known prior art, in particular has a greater displacement path for the actuator or the driver in the axial direction, but at the same time is easy to manufacture.
  • valve drive has at least one basic camshaft on which at least one cam carrier having valve actuation cams is provided in a rotationally fixed manner and axially displaceable between at least two axial positions, the cam carrier being assigned a shift gate for axial displacement by means of an actuator, which has two in has slide tracks running in opposite directions in the axial direction, partially spaced apart from one another at an opening point, both slide tracks each having an axial projection in the direction of a slide track wall delimiting the other of the slide tracks in the axial direction. It is also provided that the axial projections of the slide tracks are arranged offset from one another in the circumferential direction.
  • both slide tracks each have an axial projection in the direction of a slide track wall that delimits the other of the slide tracks in the axial direction.
  • the displacement path of the at least one slide track is increased with the aid of the axial projection.
  • the slide track wall of the slide track projects in the axial direction of the slide track wall delimiting the other of the slide tracks.
  • the axial projection is understood to mean in particular a projection which, at a circumferential position with respect to the axis of rotation of the base camshaft, has a maximum extent in the axial direction and is configured on both sides of this circumferential position with an extent in the axial direction that is smaller than that maximum extension.
  • the axial projection is in the form of a bulged elevation in the axial direction, for example.
  • One reason for an incomplete shift can be, for example, increased friction between the cam carrier and the basic camshaft, in particular between an external toothing of the basic camshaft and an internal toothing of the cam carrier engaging in this. Increased friction can also occur as a result of the roller finger follower resting against the valve actuation cam.
  • the described configuration of the slide track is particularly useful when a latching device is assigned to the cam carrier or the shift gate, which latches the cam carrier in one of several axial positions.
  • the latching device holds the cam carrier in each of the plurality of axial positions. For example, at least two, in particular exactly two, different axial positions are provided.
  • a certain force must be applied. This is achieved with the help of the actuator.
  • the impulse caused by the actuator is insufficient, the cam carrier does not reach the desired axial position, which results in the incomplete displacement described above.
  • both slide tracks each have an axial projection in the direction of the slide track wall delimiting the other of the slide tracks in the axial direction.
  • the problem of the incomplete Shifting is effectively eliminated not only for one of the slide tracks, but rather for both slide tracks.
  • the axial projections preferably have the same dimensions, in particular the same axial extent, in particular therefore the same maximum axial extent, and / or the same extent in the circumferential direction.
  • the width of the slide tracks is reduced or, given a given width of the slide tracks of the cam carriers, widened.
  • the latter is fundamentally undesirable due to the given installation space.
  • the former means that the valve train is difficult to manufacture because under certain circumstances the slide tracks, especially in the area in which they form the common slide track, are too narrow to be made with the same milling tool that is used for the other areas of the slide tracks .
  • the axial projections of the slide tracks are arranged offset from one another 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 are offset from one another in the circumferential direction. If the axial projections are arranged opposite one another, however, the problem arises again that the slide tracks are under certain circumstances too narrow for the milling tool used. For this reason, it is particularly advantageous if the axial projections are arranged offset from one another, that is to say do not lie opposite one another in the circumferential direction.
  • a further development of the invention provides that the offset of the axial projections is selected such that the smallest distance between the axial projections corresponds to at least one width of the slide tracks.
  • the smallest distance between the axial projections is preferably defined as the length of that straight line which connects the axial projections or those circumferential positions at which the axial projections have their respective greatest extension in the axial direction. This smallest distance should correspond at least to the width of the slide tracks, the slide tracks usually having the same width. Of course, the smallest distance between the axial projections can also be greater than the width of the slide tracks.
  • the slide tracks run separately from each other in front of the opening and after the opening in the form of a common slide track, an extension ramp being formed in the common slide track.
  • the slide tracks meet or merge for the first time.
  • the slide tracks run together so that they form the common slide track.
  • the extension ramp is provided, which is characterized in particular by a decreasing depth of the slide tracks in the direction facing away from the opening or an increasing distance from a base of the slide tracks.
  • the axial projections are present in the common slide track.
  • at least that circumferential position at which the axial projection or the axial projections have their greatest extent in the axial direction is - seen in the circumferential direction - in the common slide track or in the opening point.
  • a further embodiment of the invention provides that the axial extensions of the axial projections are selected such that the respective axial projection at the point of its maximum axial extension is spaced apart in the axial direction by a distance from a longitudinal center path of the common slide path which is at least half of the axial extension corresponds to a driver of the actuator.
  • the longitudinal center path corresponds, for example, to the curved path already explained above, which always runs in the middle of the respective slide path.
  • the longitudinal center track of each slide track runs in the axial direction in the middle of the slide track and on its base.
  • the distance of the axial projection from the longitudinal center axis preferably corresponds to exactly half the axial extension of the driver.
  • the driver is deflected by the axial projection as it traverses the slide track in such a way that after the axial projection - viewed in the axial direction - it is approximately centrally, preferably exactly in the middle, in the slide track or the common slide track.
  • both are axial projections or their axial extensions are selected accordingly, so that the driver is present in the circumferential direction close to the axial projection in the center of the slide track regardless of which slide track it traverses.
  • the groove depths of the link tracks are the same at the same circumferential positions.
  • the groove depth is preferably to be understood as the distance between a base of the respective gate track and an outer circumference of the shift gate. The smaller 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 base of one of the slide tracks merges into the base of the other slide track without a shoulder in the radial direction, so that the base or the bottom of the common slide track is formed continuously or without a jump in the radial direction .
  • the groove depth decreases from a point of the greatest axial extent of that axial projection to form the extension ramp which is at the front in the circumferential direction.
  • the extension ramp ensures that the driver is pushed out in the radial direction out of the slide track or the slide tracks.
  • the groove depth should decrease, preferably decrease continuously, in the area of the extension ramp.
  • the extension ramp and consequently the decrease in the groove depth, viewed in the circumferential direction already begins from the circumferential position at which the greatest axial extent of the axial projection is present.
  • the groove depth can be reduced from the axial projection at the front in the circumferential direction, i.e. the axial projection facing away from the common slide track.
  • the invention further relates to an internal combustion engine with a valve drive, in particular according to the above statements, the valve drive having at least one basic camshaft on which at least one cam carrier having valve actuation cams is provided in a rotationally fixed manner and axially displaceable between at least two axial positions, the cam carrier being axially displaced by means of a Actuator is assigned a shift gate, which on its circumference has two axially opposite, partially spaced from each other, at an opening point into each other slotted link tracks, wherein both gate tracks each have an axial projection in the direction of the other of the gate tracks in the axial direction delimiting gate track wall. It is provided that the axial projections of the slide tracks are offset from one another in the circumferential direction.
  • the Figure 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 on a base camshaft 4 of the valve drive 2 so as to be displaceable in the axial direction.
  • the shift gate 3 has an internal toothing for this purpose, which engages in an external toothing of the basic camshaft 4.
  • the shift gate 3 is assigned at least one cam carrier, not shown here, on which at least one valve actuating cam is provided.
  • the valve actuation cam is used to actuate at least one gas exchange valve of the internal combustion engine 1.
  • valve actuation cams are preferably provided on the cam carrier, with different valve actuation cams serving to actuate the gas exchange valve in different axial positions of the cam carrier.
  • the cam carrier can be displaced in the axial direction by means of the shift gate 3.
  • the valve drive 2 has an actuator 5 with a driver 6.
  • the actuator 5 is designed such that the driver 6 can be displaced in the radial direction with respect to an axis of rotation 7 of the base camshaft 4. It is shown once with solid lines in a starting position and with dashed lines in an extended position.
  • the shift gate 3 has a first gate track 8 and a second gate track 9.
  • Each of the gate tracks 8 and 9 is defined by a longitudinal center track 10 and 11, which runs centrally in the respective gate track 8 and 9, viewed in the axial direction.
  • the slide tracks 8 and 9 merge into one another at an opening point 12.
  • the opening point 12 can be defined by that point 13 at which the longitudinal center tracks 10 and 11 merge into one another.
  • the opening point 12 can also be understood to mean that circumferential position at which a partition 14 present between the slide tracks 8 and 9 is omitted for the first time.
  • slide tracks 8 and 9 are spaced apart from one another in front of the opening point 12, in particular the partition 14 is present between them. However, because they are designed to run in opposite directions in the axial direction, they run towards one another so that they merge into one another at the opening point 12. After the opening point 12, they continue to run in the form of a common slide track 15. This, too, is again characterized by the course of the longitudinal center tracks 10 and 11, which now overlap. In the outward axial direction, the slide tracks 8 and 9 are each delimited by a slide track wall 16 and 17, respectively.
  • the actuator 5 is activated in such a way that the driver 6 is extended in the radial direction, that is to say is displaced in the direction of the base camshaft 4. Accordingly, it engages in one of the slide tracks 8 and 9 (here: the first slide track 8). Because the shift gate 3 is driven in the circumferential direction by the basic camshaft 3, the driver 6 runs through the gate track 8 in the direction of the common slide track 15. It rests at least partially on the slide track wall 16, whereby the shift gate 3 and consequently also the cam carrier is displaced in the axial direction.
  • both slide tracks 8 and 9 have an axial projection 18 and 19, respectively. This protrudes in the direction of the respective other of the slide tracks 9 or 8 in the axial direction limiting slide track wall 17 or 16 16 is initially always larger until a maximum axial extension is reached. In the circumferential direction after that circumferential position at which this maximum axial extension is present, the axial extension decreases again.
  • the axial projections 18 and 19 are arranged opposite one another in the circumferential direction. This is preferably to be understood as meaning that the circumferential positions at which they have their maximum axial extent coincide.
  • the common gate track 15 is narrow in the axial direction, so that a production of the common Slide track 15 may not be able to use the same milling tool as the production of slide tracks 8 and 9 in the circumferential direction in front of the opening point 12. For this reason, it is particularly preferred if the axial projections 18 and 19 are arranged offset from one another in the circumferential direction.
  • the circumferential position of the maximum axial extent of the second link path 9 is at a circumferential position at which the axial projection 18 is no longer present.
  • the circumferential position of the maximum axial extent can also be arranged after the axial projection 18 in the circumferential direction.
  • 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 corresponds to at least a width 21 of the slide tracks 8 and 9. These preferably have the same width.
  • the smallest distance 22 in the axial direction between the axial projections 18 and 19 is dimensioned in such a way that it corresponds to at least one axial extension 23 of the driver 6.
  • the distance 22 is exactly as large as the extension 23 or at most slightly larger.
  • 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)
EP15795113.8A 2014-11-18 2015-11-10 Ventiltrieb für eine brennkraftmaschine sowie entsprechende brennkraftmaschine Active EP3221567B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014017036.5A DE102014017036B3 (de) 2014-11-18 2014-11-18 Ventiltrieb für eine Brennkraftmaschine sowie entsprechende Brennkraftmaschine
PCT/EP2015/002247 WO2016078751A1 (de) 2014-11-18 2015-11-10 Ventiltrieb für eine brennkraftmaschine sowie entsprechende brennkraftmaschine

Publications (2)

Publication Number Publication Date
EP3221567A1 EP3221567A1 (de) 2017-09-27
EP3221567B1 true EP3221567B1 (de) 2020-10-07

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EP15795113.8A Active EP3221567B1 (de) 2014-11-18 2015-11-10 Ventiltrieb für eine brennkraftmaschine sowie entsprechende brennkraftmaschine

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EP (1) EP3221567B1 (ja)
JP (1) JP6462129B2 (ja)
DE (1) DE102014017036B3 (ja)
WO (1) WO2016078751A1 (ja)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6400040B2 (ja) * 2016-03-31 2018-10-03 本田技研工業株式会社 可変動弁装置
DE102019125100A1 (de) 2019-09-18 2021-03-18 Thyssenkrupp Ag Schaltkulisse, Schiebenockensystem und Nockenwelle
DE102021210649A1 (de) * 2021-09-23 2023-03-23 Thyssenkrupp Ag Schaltkulisse, Schiebenockensystem und Nockenwelle

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Publication number Priority date Publication date Assignee Title
DE10148177B4 (de) * 2001-09-28 2015-05-13 Schaeffler Technologies AG & Co. KG Ventiltrieb mit Ventilhubumschaltung für die Gaswechselventiele eines 4-Takt-Verbrennungsmotors
DE102007010149A1 (de) * 2007-03-02 2008-09-04 Audi Ag Ventiltrieb für Gaswechselventile einer Brennkraftmaschine mit verschiebbarem Nockenträger und Doppelschneckentrieb
DE102007037232A1 (de) * 2007-08-07 2009-02-12 Eto Magnetic Gmbh Vorrichtung zur Nockenwellenverstellung einer Brennkraftmaschine
DE102008024911A1 (de) * 2008-05-23 2009-11-26 Schaeffler Kg Ventiltrieb einer Brennkraftmaschine
DE102008054254A1 (de) * 2008-10-31 2010-05-06 Schaeffler Kg Nockenwelle für einen hubvariablen Ventiltrieb einer Brennkraftmaschine
DE102008060170A1 (de) * 2008-11-27 2010-06-02 Dr.Ing.H.C.F.Porsche Aktiengesellschaft Ventiltrieb einer Brennkraftmaschine
DE102011114300B4 (de) * 2011-09-23 2016-02-25 Audi Ag Ventiltrieb einer Brennkraftmaschine sowie Brennkraftmaschine
JP5598497B2 (ja) * 2012-05-08 2014-10-01 株式会社デンソー バルブリフト調整装置
DE102013111476B4 (de) * 2013-10-17 2021-09-09 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Ventiltrieb einer Brennkraftmaschine

Non-Patent Citations (1)

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Publication number Publication date
WO2016078751A1 (de) 2016-05-26
EP3221567A1 (de) 2017-09-27
JP6462129B2 (ja) 2019-01-30
DE102014017036B3 (de) 2016-03-24
JP2018500492A (ja) 2018-01-11

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