EP3221567A1 - Ventiltrieb für eine brennkraftmaschine sowie entsprechende brennkraftmaschine - Google Patents
Ventiltrieb für eine brennkraftmaschine sowie entsprechende brennkraftmaschineInfo
- 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
Links
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 29
- 238000006073 displacement reaction Methods 0.000 claims description 19
- 230000007423 decrease Effects 0.000 claims description 8
- 230000001747 exhibiting effect Effects 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000003801 milling Methods 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000000969 carrier Substances 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
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.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
Description
Claims
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 true EP3221567A1 (de) | 2017-09-27 |
EP3221567B1 EP3221567B1 (de) | 2020-10-07 |
Family
ID=54548130
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15795113.8A Active EP3221567B1 (de) | 2014-11-18 | 2015-11-10 | Ventiltrieb für eine brennkraftmaschine sowie entsprechende brennkraftmaschine |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3221567B1 (de) |
JP (1) | JP6462129B2 (de) |
DE (1) | DE102014017036B3 (de) |
WO (1) | WO2016078751A1 (de) |
Families Citing this family (3)
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 |
Family Cites Families (9)
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 |
-
2014
- 2014-11-18 DE DE102014017036.5A patent/DE102014017036B3/de not_active Expired - Fee Related
-
2015
- 2015-11-10 EP EP15795113.8A patent/EP3221567B1/de active Active
- 2015-11-10 JP JP2017526834A patent/JP6462129B2/ja active Active
- 2015-11-10 WO PCT/EP2015/002247 patent/WO2016078751A1/de active Application Filing
Also Published As
Publication number | Publication date |
---|---|
EP3221567B1 (de) | 2020-10-07 |
JP2018500492A (ja) | 2018-01-11 |
DE102014017036B3 (de) | 2016-03-24 |
JP6462129B2 (ja) | 2019-01-30 |
WO2016078751A1 (de) | 2016-05-26 |
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