EP2196638A1 - Valve drive for actuating gas exchange valves of combustion engines - Google Patents
Valve drive for actuating gas exchange valves of combustion engines Download PDFInfo
- Publication number
- EP2196638A1 EP2196638A1 EP09400058A EP09400058A EP2196638A1 EP 2196638 A1 EP2196638 A1 EP 2196638A1 EP 09400058 A EP09400058 A EP 09400058A EP 09400058 A EP09400058 A EP 09400058A EP 2196638 A1 EP2196638 A1 EP 2196638A1
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- EP
- European Patent Office
- Prior art keywords
- camshaft
- adjusting
- contour
- cam
- valve drive
- 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
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- 238000002485 combustion reaction Methods 0.000 title claims description 12
- 238000006073 displacement reaction Methods 0.000 claims description 17
- 230000013011 mating Effects 0.000 claims description 9
- 239000000243 solution Substances 0.000 description 12
- 210000003746 feather Anatomy 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000000969 carrier Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 240000001439 Opuntia Species 0.000 description 1
- 235000004727 Opuntia ficus indica Nutrition 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
Images
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
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/02—Valve drive
- F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
- F01L1/047—Camshafts
- F01L2001/0471—Assembled camshafts
- F01L2001/0473—Composite camshafts, e.g. with cams or cam sleeve being able to move relative to the inner camshaft or a cam adjusting rod
-
- 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 train for actuating gas exchange valves of internal combustion engines with the features mentioned in the preamble of claim 1.
- the DE 100 54 623 A1 describes a device for switching a cam package on a camshaft for actuating gas exchange valves, wherein the cam assembly is guided axially displaceably on the camshaft. According to the position of the cam package, the gas exchange valve is in operative connection with different cam contours.
- the adjustment of the cam package via an actuator in cooperation with a slide track.
- the adjusting element is a pin which can be displaced radially outwards and cooperates with at least two cam tracks formed in a guide part which is arranged around the cam pack by about 180 ° in the extended state.
- a major disadvantage of DE 100 54 623 A1 is that to switch to another cam contour of the pin extended from the camshaft and must be meshed in an axially displaceable shift gate. After switching, the pin must be retracted. This construction is very part and production-consuming and there is a risk of damage to the camshaft Malfunction of the pin.
- Another disadvantage is that the motor speed is limited by the necessary actuating time of the pin. In addition, the adjustment depends on the existing oil pressure.
- From the DE 10 2004 033 798 A1 is a valve lift for gas exchange valves of an internal combustion engine between two different cam contours by means of a rotatably but axially displaceable arranged on the housing of the engine shift gate known.
- the shift gate partially comprises the camshaft and is provided with a counter-rotating direction of rotation of the camshaft Kulissennut whose side walls each form a slotted edge which is mutually engageable for valve lift in operative connection with a both sides on an axially displaceable second cam contour contact surface.
- the axially displaceable second cam contour is either pushed over a cam contour of the cam firmly connected to the camshaft or pushed away from the cam contour, so that optionally two different cam contours can be brought into operative connection with the gas exchange valve.
- the invention has for its object to provide a generic valve train for operating gas exchange valves of internal combustion engines, with a low technical complexity, a small size and low applied switching forces Ventilhubumscnies is made, with malfunction and damage to the camshaft in the valve lift also be avoided at high engine speeds.
- an adjusting shaft which can be rotated by the camshaft is arranged parallel to a camshaft, on which two adjusting devices are rotatably mounted and two drivers which are axially displaceable on the adjusting shaft between the adjusting devices.
- the drivers are fixed to an axially displaceable switching gate for valve switching between two different cam profiles of an axially displaceable on the camshaft cam package connected.
- the end faces of the carriers arranged between the adjusting devices are provided with a contour, which in each case are operatively connected via a contour arranged on the adjusting device or a guide pin.
- the contours of the two drivers are arranged offset by 180 °.
- the carriers By rotating the adjusting shaft, the carriers are axially displaced on the adjusting shaft by the guide pins sliding on the contour.
- the adjusting shaft is switchably engageable and separable via a control gear with the camshaft.
- the adjusting gear for connecting and disconnecting the camshaft with the adjusting shaft is a toothed gear in which a gear is arranged axially displaceable and rotationally fixed on the adjusting shaft, which is switchably engageable and separable with a camshaft fixed to the toothed segment engageable.
- the actuating gear for connecting and disconnecting the camshaft with the adjusting shaft consists of a lever system and a profiled link member.
- the advantage of the solution according to the invention is that with a low effort and a small space required a safe valve lift switching between different cam contours takes place. Due to the controlled rotation of the adjusting shaft via the camshaft and thus the positively controlled displacement of the shift gate, faulty switching during valve lift switching is avoided. Another advantage is that with the solution according to the invention a valve lift switching between two or more cam profiles can be performed.
- the fact that the members of the adjusting gear are designed as a gate part and lever system, it is achieved that during a switching operation, a gradual engagement of the gear members takes place with each other. As a result, switching shocks and short-term occurring in the control gear peak forces are avoided.
- the Indian FIG. 1 illustrated valve train according to the invention for the actuation of gas exchange valves consists of a driven by a crankshaft of the internal combustion engine camshaft 1, which parallel to an adjusting 12 for actuating a valve lift switching between two different cam profiles 15; 16 is arranged.
- an adjustment of two valves of a cylinder takes place.
- An application of the solution according to the invention can also be used analogously for several cylinders.
- On the camshaft 1 is rotatably and axially displaceably a cam package 2 is mounted on the camshaft 1 is rotatably and axially displaceably a cam package 2 is mounted on the camshaft 1 is rotatably and axially displaceably a cam package 2 is mounted.
- the cam package 2 consists of four cams, of which two adjacent cams each have a large cam profile 15 and a small cam profile 16.
- the cam package 2 can, as in FIGS.
- FIG. 4 is a switching position shown in each of the small cam profile 16 is in operative connection with the gas exchange valves. In this switching position, the small cam profile 16 is above the base circle profile 14.
- FIG. 5 is a switching position shown, in which the gas exchange valves are actuated by the large cam profiles 15.
- a detent element is arranged between the displaceable cam part and the camshaft 1.
- cam package 2 it is also possible to form the cam package 2 as a component which is non-rotatably connected to the camshaft 1, but is axially displaceable on this. It is necessary that the large cam profile 15 and the small cam profile 16 are each provided with a uniform base circle profile 14.
- a pin 4 is fixed, which is engageable with the inner surfaces of a widening cam groove 20 of an axially movable shift gate 3 for moving the cam package 2 in engagement.
- the shift gate 3 partially comprises the camshaft 1 and is provided with a groove groove 20 that widens against the direction of rotation of the camshaft 1.
- the pin 4 passes through the cam groove 20 of the shift gate 3 with each rotation of the camshaft 1.
- the pin 4 is arranged on the cam package 2, that the axis of the pin 4 is arranged in accordance with a suitable for the phase of the base circle 14 switching, as in FIGS. 4 and 5 shown.
- a driver 5 Fixed 23, which are mounted axially displaceable on the adjusting shaft 12.
- a contour 21 On the outer end face of the driver 5 is a contour 21 and on the outer end face of the driver 23 is a contour 22 is arranged.
- the two drivers 5; 23 are on the adjusting shaft 12 between two on the adjusting shaft 12 rotatably arranged adjusting devices 10; 17 arranged.
- a guide pin 18 is fixed, which is in operative connection with the contour 21 of the driver 5 stands.
- a guide pin 24 is fixed, which is in operative connection with the contour 22 of the driver 23.
- the engagement of the guide pin 18 of the adjusting device 10 on the contour 21 of the driver 5 is arranged offset from the engagement of the guide pin 24 of the adjusting device 17 on the contour 22 of the driver 23 by 180 °.
- the axes of the guide pins 18; 24 are in an axial direction and the contours 21; 22 are offset from each other by 180 °, or the contours 21; 22 are arranged identically and the guide pins 18; 24 are offset from each other by 180 °.
- the rotation of the adjusting shaft 12 is effected by the camshaft 1, wherein the adjusting shaft 12 via a control gear with the camshaft 1 switchably engageable and separable.
- the adjusting gear for connecting and disconnecting the camshaft 1 with the adjusting shaft 12 is, according to a first variant, a gear transmission.
- a gear 7 is rotatably mounted on the adjusting shaft 12, but axially displaceable.
- the gear 7 is connected to a drive 8, which extends an adjusting bolt 19 when operating.
- the axially displaceable gear 7 engages in a toothed segment 8 located on the camshaft 1.
- the toothed segment 8 extends on the camshaft 1 upon actuation of two gas exchange valves over an angular range of 180 ° and is arranged so that a displacement of the driver 5; 23 takes place only when the pin 4 is outside the sliding groove 20.
- the toothed segment 8 would only extend over an angular range of 90 °.
- FIG. 6 a valvetrain is shown, was activated by the commissioning of the drive 6, the switching operation of the intervention of the no cam profile 16 with the gas exchange valves to the large cam profile 15.
- the cam package 2 is located in front of the initiation of the switching in the in FIG. 4 shown position.
- the gear 7 is displaced on the adjusting shaft 12 in such a way by the adjusting bolt 19 that it comes into engagement with the toothed segment 8 arranged on the camshaft 1.
- a displacement of the gear 7 takes place only if it is ensured that in the actual displacement operation no engagement of the gear 7 can be done with the sector gear 8.
- FIG. 7 shows an intermediate position of the valve lift by the adjusting 12.
- the adjusting 12 By the rotation of the adjusting 12 at the same time on the adjusting shaft 12 rotatably arranged adjusting 10; 17 and thus the guide pins 18 fixed thereto; 24 twisted. Since the guide pins 18; 24 with each offset by 180 ° arranged contour 21; 22 of the driver 5; 23 are in operative contact, there is an axial displacement of the two drivers 5; 23 on the adjusting shaft 12 in the direction of the adjusting device 17.
- the driver 5; 23 takes place at the same time an axial displacement of the shift gate 3.
- FIG. 8 is the side view according to the FIG. 7 and in FIG. 9 the corresponding plan view shown. In the FIG. 8 one can clearly see the interaction of the guide pins 18; 24 with the respective contour 21; 22 of the driver 5; 23 recognize.
- the contour 21; 22 of the driver 5; 23 is arranged so that a phase-correct switching of the shift gate 3 takes place.
- a locking device is arranged on the adjusting device 10 or 17.
- the locking device consists of a spring 11 and a ball 13 which engages in a correspondingly arranged in the adjusting device 10 or 17 recess. In the FIG. 2 you can recognize the latched in the recess 10 of the adjusting balls 13.
- the drive 6 is deactivated and by the spring force of the adjustment direction of the drive 6 counteracting spring 9, the gear 7 is moved out of the engagement region of the toothed segment 8.
- FIG. 1 This position is shown with already protestverschobenem gear 7.
- cam package 2 By arranged between camshaft 1 and displaceable cam package locking device, the cam package 2 is locked in the newly reached switching position. Due to the arrangement of the switching gate 3 and the pin 4 is achieved that a displacement of the cam assembly 2 and thus a valve lift switching only takes place when the respective base circle profile 14 of the camshaft 1 is in operative connection with a gas exchange valve.
- a return adjustment is analogous to the above description, whereby by the with the contours 21; 22 operatively connected guide pins 18; 24, the drivers 5; 23 are moved in the direction of the adjusting device 10.
- FIGS. 10 to 12 a variant of the solution according to the invention is shown.
- the same reference numerals have been used for the same components.
- the cam package 2 has in each case a small cam profile 16, a central cam profile 25 and a large cam profile 15, so that a valve changeover can take place between three different cam profiles.
- the shift gate 3 is about two drivers 5; 23 connected axially displaceable.
- the drivers 5 and 23 can, as in FIG. 10 represented, interconnected and form a component or, as in FIG. 11 shown, split executed.
- the drivers 5 and 23 are, as described above, axially displaceably mounted on the adjusting shaft 12 between the two adjusting devices 10 and 17.
- the first adjusting device 10 is operatively connected to the first contour 21 of the first driver 5 via a first mating contour 26 arranged thereon.
- the second adjusting device 17 is operatively connected to the second contour 22 of the second driver 23 via a second mating contour 27 arranged thereon.
- the first contour 21 is operatively connected via a guide pin 18 arranged on the first adjusting device 10 and the second contour 22 via a guide pin 24 arranged on the second adjusting device 17. It is also possible, instead of in the preceding examples described guide pins 18 and 24 to the adjusting devices 10 and 17 corresponding counter-contours 26 and 27 to arrange.
- the rotation of the adjusting shaft 12 also takes place via a control gear in which the adjusting shaft 12 is engageably engaged with the camshaft 1 and separated.
- the adjusting gear for rotating the adjusting shaft 12 is here, according to a second variant, formed from a lever system 28 and a profiled link member 29.
- the adjusting gear for rotating the adjusting shaft 12 in this case consists of one on the adjusting shaft 12 fixedly arranged or multi-armed lever system 28 and an axially displaceable on the camshaft 1 and rotatably arranged profiled link member 29, wherein the profiled link member 29 switchable with the lever system 28 into engagement Can be brought and separated.
- the lever system 28 is arranged axially displaceably on the camshaft 1 and the link member 29 fixed on the adjusting shaft 12.
- the actuating gear is shown in a rest or detent position in which the link member 29 is not engaged with the lever system 28. In this position, there is no displacement of the driver 5 and 23 and thus no switching to another cam profile.
- the link member 29 is preferably formed as a cam, which is axially displaced by an actuator 30 on the camshaft 1 to initiate the switchover to another cam contour.
- the axial displacement of the cam member 29 and optionally of the actuator 30 is shown on the camshaft 1 by a double arrow.
- the provision of the gate part 29 in the rest or detent position is supported by a force acting on the cam member 29 spring 32.
- the lever system 28 shown in the embodiment is designed as a four-stage lever system 28, at the ends of each lever a roller 31 is arranged.
- the lever ends may also be formed as a corresponding sliding surface, not shown.
- the slide member 29 is axially displaced on the camshaft 1 by actuation of the actuator 30 so that the slide member 29 comes into operative engagement with a roller 31 of the lever system 28 ,
- the engagement of the link member 29 is shown with the lever system 28.
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Abstract
Description
Die Erfindung betrifft einen Ventiltrieb zur Betätigung von Gaswechselventilen von Brennkraftmaschinen mit den im Oberbegriff des Patentanspruches 1 genannten Merkmalen.The invention relates to a valve train for actuating gas exchange valves of internal combustion engines with the features mentioned in the preamble of
Es ist bekannt, Gaswechselventile einer Brennkraftmaschine variabel mit unterschiedlichen Öffnungs- und Schließzeitpunkten sowie mit unterschiedlichen Ventilöffnungshüben zu betreiben. Eine derartige Ventilsteuerung ist aus der
Aus der
Aus der
Weiterhin ist aus der
Die
Nachteilig bei dem zitierten Stand der Technik ist der hohe Bauraumbedarf, der zur Verstellung des Nockenblocks benötigt wird. Diese Lösungen sind deshalb nur einsetzbar bei verhältnismäßig großen Zylinderabständen, um die entsprechenden Bauteile unterbringen zu können. Ein weiterer Nachteil sind die beim Stellvorgang auftretenden hohen Massenkräfte, die zum Verschieben der Nockenblöcke oder der Verstellorgane benötigt werden. Die Umschaltung auf eine entsprechende Nockenkontur kann mit den im Stand der Technik genannten Lösungen meist nur zylinderselektiv erfolgen. Eine ventilselektive Umschaltung ist nicht möglich.A disadvantage of the cited prior art, the high space requirement, which is needed to adjust the cam block. These solutions are therefore only applicable at relatively large cylinder spacings to accommodate the corresponding components can. Another disadvantage is the high inertial forces occurring during the adjustment process, which are needed to move the cam blocks or the adjusting members. Switching to a corresponding cam contour can usually be carried out only with a cylinder-selective approach using the solutions mentioned in the prior art. Valve-selective switching is not possible.
Ein wesentlicher Nachteil der
Aus der
Der Erfindung liegt die Aufgabe zugrunde, einen gattungsgemäßen Ventiltrieb zur Betätigung von Gaswechselventilen von Brennkraftmaschinen zu schaffen, mit dem bei einem geringen technischen Aufwand, einer geringen Baugröße und bei geringen aufzubringenden Schaltkräften eine Ventilhubumschaltung vorgenommen wird, wobei Fehlschaltungen und Beschädigungen der Nockenwelle bei der Ventilhubumschaltung auch bei hohen Motordrehzahlen vermieden werden.The invention has for its object to provide a generic valve train for operating gas exchange valves of internal combustion engines, with a low technical complexity, a small size and low applied switching forces Ventilhubumschaltung is made, with malfunction and damage to the camshaft in the valve lift also be avoided at high engine speeds.
Erfindungsgemäß wird die Aufgabe durch die Merkmale des Patentanspruches 1 gelöst.According to the invention the object is achieved by the features of
Zur Betätigung der Ventilhubumschaltung ist parallel zu einer Nockenwelle eine durch die Nockenwelle verdrehbare Verstellwelle angeordnet, auf der drehfest zwei Verstelleinrichtungen und zwischen den Verstelleinrichtungen zwei auf der Verstellwelle axial verschiebbare Mitnehmer angeordnet sind. Die Mitnehmer sind fest mit einer axial verschiebbaren Schaltkulisse zur Ventilumschaltung zwischen zwei unterschiedlichen Nockenprofilen eines axial auf der Nockenwelle verschiebbaren Nockenpakets verbunden. Die Stirnseiten der zwischen den Verstelleinrichtungen angeordneten Mitnehmer sind mit einer Kontur versehen, die jeweils über eine an der Verstelleinrichtung angeordnete Kontur oder einen Führungsstift in Wirkverbindung stehen. Dabei sind die Konturen der beiden Mitnehmer um 180° versetzt angeordnet. Durch Verdrehen der Verstellwelle werden durch die auf der Kontur gleitenden Führungsstifte die Mitnehmer auf der Verstellwelle axial verschoben. Zum Verdrehen der Verstellwelle ist die Verstellwelle über ein Stellgetriebe mit der Nockenwelle schaltbar in Eingriff bringbar und trennbar. Das Stellgetriebe zum Verbinden und Trennen der Nockenwelle mit der Verstellwelle ist ein Zahnradgetriebe, bei dem auf der Verstellwelle ein Zahnrad axial verschiebbar und drehfest angeordnet ist, das mit einem an der Nockenwelle fest angeordneten Zahnsegment schaltbar in Eingriff bringbar und trennbar ist. Gemäß einer Variante besteht das Stellgetriebe zum Verbinden und Trennen der Nockenwelle mit der Verstellwelle aus einem Hebelsystem und einem profilierten Kulissenteil.To actuate the valve lift, an adjusting shaft which can be rotated by the camshaft is arranged parallel to a camshaft, on which two adjusting devices are rotatably mounted and two drivers which are axially displaceable on the adjusting shaft between the adjusting devices. The drivers are fixed to an axially displaceable switching gate for valve switching between two different cam profiles of an axially displaceable on the camshaft cam package connected. The end faces of the carriers arranged between the adjusting devices are provided with a contour, which in each case are operatively connected via a contour arranged on the adjusting device or a guide pin. The contours of the two drivers are arranged offset by 180 °. By rotating the adjusting shaft, the carriers are axially displaced on the adjusting shaft by the guide pins sliding on the contour. For rotating the adjusting shaft, the adjusting shaft is switchably engageable and separable via a control gear with the camshaft. The adjusting gear for connecting and disconnecting the camshaft with the adjusting shaft is a toothed gear in which a gear is arranged axially displaceable and rotationally fixed on the adjusting shaft, which is switchably engageable and separable with a camshaft fixed to the toothed segment engageable. According to a variant, the actuating gear for connecting and disconnecting the camshaft with the adjusting shaft consists of a lever system and a profiled link member.
Der Vorteil der erfindungsgemäßen Lösung besteht darin, dass bei einem geringen Aufwand und einem geringen benötigten Bauraum eine sichere Ventilhubumschaltung zwischen unterschiedlichen Nockenkonturen erfolgt. Durch die gesteuerte Verdrehung der Verstellwelle über die Nockenwelle und damit der zwangsgesteuerten Verschiebung der Schaltkulisse werden Fehlschaltungen bei der Ventilhubumschaltung vermieden. Ein weiterer Vorteil besteht darin, dass mit der erfindungsgemäßen Lösung eine Ventilhubumschaltung zwischen zwei oder mehreren Nockenprofilen durchgeführt werden kann. Dadurch, dass die Glieder des Stellgetriebes als Kulissenteil und Hebelsystem ausgebildet sind, wird erreicht, dass bei einem Schaltvorgang ein allmählicher Eingriff der Getriebeglieder miteinander erfolgt. Dadurch werden Schaltschläge und kurzzeitig im Stellgetriebe auftretende Spitzenkräfte vermieden.The advantage of the solution according to the invention is that with a low effort and a small space required a safe valve lift switching between different cam contours takes place. Due to the controlled rotation of the adjusting shaft via the camshaft and thus the positively controlled displacement of the shift gate, faulty switching during valve lift switching is avoided. Another advantage is that with the solution according to the invention a valve lift switching between two or more cam profiles can be performed. The fact that the members of the adjusting gear are designed as a gate part and lever system, it is achieved that during a switching operation, a gradual engagement of the gear members takes place with each other. As a result, switching shocks and short-term occurring in the control gear peak forces are avoided.
Weitere vorteilhafte Ausgestaltungen sind in den Unteransprüchen beschrieben, sie werden in der Beschreibung zusammen mit ihren Wirkungen erläutert.Further advantageous embodiments are described in the subclaims, they are explained in the description together with their effects.
Anhand von Zeichnungen wird die Erfindung nachfolgend an Ausführungsbeispielen näher beschrieben. In den dazugehörigen Zeichnungen zeigen:
- Fig. 1:
- eine perspektivische Darstellung der erfindungsgemäßen Lösung, bei der eine große Nockenkontur wirksam ist,
- Fig. 2:
- eine Seitenansicht von rechts gemäß
,Figur 1 - Fig. 3:
- eine Seitenansicht von links gemäß
,Figur 1 - Fig. 4:
- eine Detailansicht der Nockenwelle mit verschiebbarem Nockensegment in einer Schaltstellung, bei der die kleine Nockenkontur in Wirkverbindung mit einem Gaswechselventil steht,
- Fig. 5:
- eine Detailansicht der Nockenwelle mit verschiebbarem Nockensegment in einer Schaltstellung, bei der die große Nockenkontur in Wirkverbindung mit einem Gaswechselventil steht,
- Fig. 6:
- eine perspektivische Darstellung der erfindungsgemäßen Lösung, bei einer aktivierten Umschaltung zwischen den Nockenprofilen, oder bei einer Raststellung des Nockenpakets,
- Fig. 7:
- eine perspektivische Darstellung der erfindungsgemäßen Lösung, in einer Zwischenstellung bei einer Umschaltung zwischen den Nockenprofilen während der Axialverschiebung der Schaltkulisse,
- Fig. 8:
- eine Vorderansicht gemäß
,Figur 6 - Fig. 9:
- eine Ansicht von oben gemäß
Figur 6 , - Fig. 10:
- eine Variante der erfindungsgemäßen Vorrichtung in perspektivischer Darstellung bei nichtaktivierter Verstellwellenbetätigung,
- Fig. 11:
- eine Seitenansicht gemäß
Figur 10 und - Fig. 12:
- die
Variante gemäß Figur 10 bei einer aktivierten Verstellwellenbetätigung.
- Fig. 1:
- a perspective view of the solution according to the invention, in which a large cam contour is effective,
- Fig. 2:
- a side view from the right according to
FIG. 1 . - 3:
- a side view from the left according to
FIG. 1 . - 4:
- a detailed view of the camshaft with displaceable cam segment in a switching position in which the small cam contour is in operative connection with a gas exchange valve,
- Fig. 5:
- a detailed view of the camshaft with displaceable cam segment in a switching position, in which the large cam contour is in operative connection with a gas exchange valve,
- Fig. 6:
- a perspective view of the solution according to the invention, in an activated switching between the cam profiles, or at a detent position of the cam package,
- Fig. 7:
- a perspective view of the solution according to the invention, in an intermediate position at a switching between the cam profiles during the axial displacement of the shift gate,
- Fig. 8:
- a front view according to
FIG. 6 . - Fig. 9:
- a view from above according to
FIG. 6 . - Fig. 10:
- a variant of the device according to the invention in a perspective view at nichtaktivierter Verstellwellenbetätigung,
- Fig. 11:
- a side view according to
FIG. 10 and - Fig. 12:
- the variant according to
FIG. 10 at an activated Verstellwellenbetätigung.
Der in der
Es ist auch möglich, das Nockenpaket 2 als ein Bauteil auszubilden, das drehfest mit der Nockenwelle 1 verbunden ist, aber auf dieser axial verschiebbar ist. Dabei ist es erforderlich, dass das große Nockenprofil 15 und das kleine Nockenprofil 16 jeweils mit einem einheitlichen Grundkreisprofil 14 versehen ist.It is also possible to form the
An dem axial verschiebbaren Nockenpaket 2 ist ein Pin 4 fest angeordnet, der mit den Innenflächen einer sich erweiternden Kulissennut 20 einer axial verschiebbaren Schaltkulisse 3 zum Verschieben des Nockenpakets 2 in Eingriff bringbar ist. Die Schaltkulisse 3 umfasst teilweise die Nockenwelle 1 und ist mit einer sich entgegen der Drehrichtung der Nockenwelle 1 erweiternden Kulissennut 20 versehen. Der Pin 4 durchläuft bei jeder Drehung der Nockenwelle 1 die Kulissennut 20 der Schaltkulisse 3. Der Pin 4 ist dabei so an dem Nockenpaket 2 angeordnet, dass die Achse des Pins 4 entsprechend einer für die Phase des Grundkreises 14 gerechten Umschaltung angeordnet ist, so wie in
Am Umfang der Schaltkulisse 3 ist beidseitig jeweils ein Mitnehmer 5; 23 fest angeordnet, die axial auf der Verstellwelle 12 verschiebbar gelagert sind. An der außen liegenden Stirnseite des Mitnehmers 5 ist eine Kontur 21 und an der außen liegenden Stirnseite des Mitnehmers 23 ist eine Kontur 22 angeordnet. Die beiden Mitnehmer 5; 23 sind auf der Verstellwelle 12 zwischen zwei auf der Verstellwelle 12 drehfest angeordneten Verstelleinrichtungen 10; 17 angeordnet. An der Verstelleinrichtung 10 ist fest ein Führungsstift 18 angeordnet, der in Wirkverbindung mit der Kontur 21 des Mitnehmers 5 steht. An der Verstelleinrichtung 17 ist fest ein Führungsstift 24 angeordnet, der in Wirkverbindung mit der Kontur 22 des Mitnehmers 23 steht. Der Eingriff des Führungsstiftes 18 der Verstelleinrichtung 10 an der Kontur 21 des Mitnehmers 5 ist gegenüber dem Eingriff des Führungsstiftes 24 der Verstelleinrichtung 17 an der Kontur 22 des Mitnehmers 23 um 180° versetzt angeordnet. Dabei können entweder die Achsen der Führungsstifte 18; 24 in einer Achsrichtung liegen und die Konturen 21; 22 sind gegeneinander um 180° versetzt, oder die Konturen 21; 22 sind identisch angeordnet und die Führungsstifte 18; 24 sind gegeneinander um 180° versetzt.At the periphery of the
Das Verdrehen der Verstellwelle 12 erfolgt durch die Nockenwelle 1, wobei die Verstellwelle 12 über ein Stellgetriebe mit der Nockenwelle 1 schaltbar in Eingriff bringbar und trennbar ist. Das Stellgetriebe zum Verbinden und Trennen der Nockenwelle 1 mit der Verstellwelle 12 ist, gemäß einer ersten Variante, ein Zahnradgetriebe. Dabei ist auf der Verstellwelle 12 drehfest, aber axial verschiebbar ein Zahnrad 7 gelagert. Zum Verschieben des Zahnrades 7 auf der Verstellwelle 12 gegen den Federdruck einer Feder 9 ist das Zahnrad 7 mit einem Antrieb 8 verbunden, der beim Betätigen einen Verstellbolzen 19 ausfährt. Nach der Betätigung des Antriebs 6 greift das axial verschiebbare Zahnrad 7 in ein auf der Nockenwelle 1 befindliches Zahnsegment 8 ein. Das Zahnsegment 8 erstreckt sich auf der Nockenwelle 1 bei Betätigung von zwei Gaswechselventilen über einen Winkelbereich von 180° und ist so angeordnet, dass eine Verschiebung der Mitnehmer 5; 23 nur dann erfolgt, wenn sich der Pin 4 außerhalb der Kulissennut 20 befindet. Bei Betätigung von mehreren Gaswechselventilen von zusätzlichen beispielsweise zwei Zylindern durch einen Nockenstern würde sich das Zahnsegment 8 nur über einen Winkelbereich von 90° erstrecken.The rotation of the adjusting
Ein Verstellen des Nockenpakets 2 zur Ventilhubumschaltung zwischen zwei unterschiedlichen Nockenprofilen 15; 16 erfolgt wie folgt:An adjustment of the
In der
Nach Durchlaufen des Eingriffes des Zahnrades 7 mit dem Zahnsegment 8 wurden die Verstelleinrichtungen 10; 17 soweit verdreht, dass der Führungsstift 18 an dem höchsten Punkt der Kontur 21 und der Führungsstift 24 an dem tiefsten Punkt der Kontur 22 anliegt. Das Verschieben der Mitnehmer 5; 23 ist abgeschlossen. Um ein Weiterdrehen der Verstellwelle 12 zu verhindern, ist an der Verstelleinrichtung 10 oder 17 eine Arretierungsvorrichtung angeordnet. Die Arretierungsvorrichtung besteht aus einer Feder 11 und einer Kugel 13, die in eine entsprechend in der Verstelleinrichtung 10 oder 17 angeordnete Vertiefung einrastet. In der
Während des Verschiebens der Schaltkulisse 3 durch die Mitnehmer 5; 23 befindet sich der fest am Nockenpaket 2 angeordnete Pin 4 außerhalb des Bereiches der sich entgegen der Drehrichtung der Nockenwelle 1 erweiternden Kulissennut 20, so wie in
Eine Rückverstellung erfolgt analog der vorstehenden Beschreibung, wobei durch die mit den Konturen 21; 22 in Wirkverbindung stehenden Führungsstifte 18; 24 die Mitnehmer 5; 23 in Richtung der Verstelleinrichtung 10 verschoben werden.A return adjustment is analogous to the above description, whereby by the with the
In den
Das Verdrehen der Verstellwelle 12 erfolgt ebenfalls über ein Stellgetriebe, bei dem die Verstellwelle 12 mit der Nockenwelle 1 schaltbar in Eingriff gebracht und getrennt wird. Das Stellgetriebe zum Verdrehen der Verstellwelle 12 wird hierbei, gemäß einer zweiten Variante, aus einem Hebelsystem 28 und einem profilierten Kulissenteil 29 gebildet. Das Stellgetriebe zum Verdrehen der Verstellwelle 12 besteht hierbei aus einem auf der Verstellwelle 12 fest angeordneten ein- oder mehrarmigen Hebelsystem 28 und einem auf der Nockenwelle 1 axial verschiebbar und drehfest angeordneten profilierten Kulissenteil 29, wobei das profilierte Kulissenteil 29 schaltbar mit dem Hebelsystem 28 in Eingriff bringbar und trennbar ist. Es ist auch möglich, dass das Hebelsystem 28 axial verschiebbar auf der Nockenwelle 1 und das Kulissenteil 29 fest auf der Verstellwelle 12 angeordnet ist. In der
Das in dem Ausführungsbeispiel dargestellte Hebelsystem 28 ist als vierstufiges Hebelsystem 28 ausgebildet, an dessen Hebelenden jeweils eine Rolle 31 angeordnet ist. Die Hebelenden können auch als eine entsprechende nicht dargestellte Gleitfläche ausgebildet sein.The
Zur Umschaltung auf ein anderes Nockenprofil, beispielsweise von dem kleinen Nockenprofil 16 zu dem mittleren Nockenprofil 25, wird durch Betätigung des Aktuators 30 das Kulissenteil 29 auf der Nockenwelle 1 axial derart verschoben, dass das Kulissenteil 29 in Wirkeingriff mit einer Rolle 31 des Hebelsystems 28 gelangt. In
- 11
- Nockenwellecamshaft
- 22
- Nockenpaketcam package
- 33
- Schaltkulisseshift gate
- 44
- PinPin code
- 55
- Mitnehmertakeaway
- 66
- Antriebdrive
- 77
- Zahnradgear
- 88th
- Zahnsegmenttoothed segment
- 99
- Federfeather
- 1010
- Verstelleinrichtungadjustment
- 1111
- Federfeather
- 1212
- Verstellwelleadjusting
- 1313
- KugelBullet
- 1414
- GrundkreisprofilBase circle profile
- 1515
- großes Nockenprofilbig cam profile
- 1616
- kleines Nockenprofilsmall cam profile
- 1717
- Verstelleinrichtungadjustment
- 1818
- Führungsstiftguide pin
- 1919
- Verstellbolzenadjusting pin
- 2020
- Kulissennutlink groove
- 2121
- Konturcontour
- 2222
- Konturcontour
- 2323
- Mitnehmertakeaway
- 2424
- Führungsstiftguide pin
- 2525
- mittleres Nockenprofilmiddle cam profile
- 2626
- erste Gegenkonturfirst counter contour
- 2727
- zweite Gegenkontursecond counter contour
- 2828
- Hebelsystemlever system
- 2929
- Kulissenteillink part
- 3030
- Aktuatoractuator
- 3131
- Rollerole
- 3232
- Federfeather
Claims (13)
dadurch gekennzeichnet, dass
das Stellgetriebe zum Verbinden und Trennen der Nockenwelle (1) mit der Verstellwelle (12) ein Zahnradgetriebe ist, bei dem auf der Verstellwelle (12) ein Zahnrad (7) axial verschiebbar und drehfest angeordnet ist, das mit einem an der Nockenwelle (1) fest angeordneten Zahnsegment (8) schaltbar in Eingriff bringbar und trennbar ist.Valve drive according to claim 1,
characterized in that
the adjusting gear for connecting and disconnecting the camshaft (1) with the adjusting shaft (12) is a toothed gear in which a toothed wheel (7) is arranged axially displaceably and non-rotatably on the adjusting shaft (12) and is connected to one of the camshaft (1). fixed toothed segment (8) switchable engageable and separable.
dadurch gekennzeichnet, dass
das Stellgetriebe zum Verbinden und Trennen der Nockenwelle (1) mit der Verstellwelle (12) aus einem Hebelsystem (28) und einem profilierten Kulissenteil (29) besteht.Valve drive according to claim 1,
characterized in that
the adjusting gear for connecting and disconnecting the camshaft (1) with the adjusting shaft (12) consists of a lever system (28) and a profiled link member (29).
dadurch gekennzeichnet, dass
das ein- oder mehrarmig ausgebildete Hebelsystem (28) fest auf der Verstellwelle (12) und das profilierte Kulissenteil (29) axial verschiebbar und drehfest auf der Nockenwelle (1) angeordnet ist, wobei das profilierte Kulissenteil (29) durch einen Aktuator (30) schaltbar mit dem Hebelsystem (28) in Eingriff bringbar und trennbar ist.Valve drive according to claim 3,
characterized in that
the one or more arm lever system (28) fixed on the adjusting shaft (12) and the profiled link member (29) axially displaceable and rotationally fixed on the camshaft (1) is arranged, wherein the profiled link member (29) by an actuator (30) switchable with the lever system (28) engageable and separable.
dadurch gekennzeichnet, dass
das ein- oder mehrarmig ausgebildete Hebelsystem (28) axial verschiebbar und drehfest auf der Nockenwelle (1) und das profilierte Kulissenteil (29) fest auf der Verstellwelle (12) angeordnet ist, wobei das Hebelsystem (28) durch einen Aktuator (30) schaltbar mit dem profilierten Kulissenteil (29) in Eingriff bringbar und trennbar ist.Valve drive according to claim 3,
characterized in that
the one or more arm lever system (28) axially displaceable and rotationally fixed on the camshaft (1) and the profiled link member (29) fixed to the adjusting shaft (12) is arranged, wherein the lever system (28) by an actuator (30) switchable with the profiled gate member (29) engageable and separable.
dadurch gekennzeichnet, dass
ein auf der Nockenwelle (1) axial verschiebbares und drehfest angeordnetes Nockenpaket (2) fest mit einem Pin (4) verbunden ist, der zur Ventilumschaltung mit den Innenseiten der sich entgegen der Drehrichtung der Nockenwelle (1) erweiternden Kulissennut (20) der Schaltkulisse (3) in Eingriff bringbar ist.Valve drive according to one of the preceding claims,
characterized in that
a on the camshaft (1) axially displaceable and non-rotatably arranged cam package (2) is fixedly connected to a pin (4) for valve switching with the inner sides of the counter to the direction of rotation of the camshaft (1) expanding Kulissennut (20) of the shift gate ( 3) is engageable.
dadurch gekennzeichnet, dass
die erste Gegenkontur (26) der ersten Verstelleinrichtung (10) als erster Führungsstift (18) und die zweite Gegenkontur (27) der zweiten Verstelleinrichtung (17) als zweiter Führungsstift (24) ausgebildet sind.Valve drive according to one of the preceding claims,
characterized in that
the first mating contour (26) of the first adjusting device (10) as the first guide pin (18) and the second mating contour (27) of the second adjusting device (17) as a second guide pin (24) are formed.
dadurch gekennzeichnet, dass
der erste Mitnehmer (5) und der zweite Mitnehmer (23) miteinander verbunden sind.Valve drive according to one of the preceding claims,
characterized in that
the first driver (5) and the second driver (23) are interconnected.
dadurch gekennzeichnet, dass
der Eingriff der ersten Gegenkontur (26) oder des ersten Führungsstiftes (18) der ersten Verstelleinrichtung (10) an der ersten Kontur (21) des ersten Mitnehmers (5) gegenüber dem Eingriff der zweiten Gegenkontur (27) oder des zweiten Führungsstiftes (24) der zweiten Verstelleinrichtung (17) an der zweiten Kontur (22) des zweiten Mitnehmers (23) um 180° versetzt angeordnet ist.Valve drive according to one of the preceding claims,
characterized in that
the engagement of the first mating contour (26) or the first guide pin (18) of the first adjusting device (10) on the first contour (21) of the first driver (5) with respect to the engagement of the second mating contour (27) or the second guide pin (24) the second adjusting device (17) on the second contour (22) of the second driver (23) is arranged offset by 180 °.
dadurch gekennzeichnet, dass
das Hebelsystem (28) vorzugsweise als vierarmiges Hebelsystem (28) ausgebildet ist, an dessen Hebelenden jeweils eine Rolle (31) angeordnet ist, oder die Hebelenden als Gleitflächen ausgebildet sind.Valve drive according to one of the preceding claims,
characterized in that
the lever system (28) is preferably designed as a four-armed lever system (28), at the ends of each of which a roller (31) is arranged, or the lever ends are designed as sliding surfaces.
dadurch gekennzeichnet, dass
eine Verstelleinrichtung (10 oder 17) mit einer Arretiervorrichtung, bestehend aus mindestens einer Feder (11) und mindestens einer Kugel (13), versehen ist.Valve drive according to one of the preceding claims,
characterized in that
an adjusting device (10 or 17) with a locking device, consisting of at least one spring (11) and at least one ball (13) is provided.
dadurch gekennzeichnet, dass
an dem Zahnrad (7) eine Feder (9) angeordnet ist, deren Federkraft entgegen der Verschiebungsrichtung des Antriebs (6) gerichtet ist.Valve drive according to one of the preceding claims,
characterized in that
on the gear (7), a spring (9) is arranged, whose spring force is directed against the displacement direction of the drive (6).
dadurch gekennzeichnet, dass
das Kulissenteil (29) als ein Nocken ausgebildet ist.Valve drive according to one of the preceding claims,
characterized in that
the slide member (29) is formed as a cam.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102008061440A DE102008061440B3 (en) | 2008-12-10 | 2008-12-10 | Valve gear for actuating gas exchange valves of internal combustion engines |
DE102009057691A DE102009057691A1 (en) | 2009-12-07 | 2009-12-07 | Valve train for actuating gas exchange valves of internal combustion engine, has twistable adjusting shaft brought into engagement with and/or separable from cam shaft by adjusting gear for twisting adjusting shaft |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2196638A1 true EP2196638A1 (en) | 2010-06-16 |
EP2196638B1 EP2196638B1 (en) | 2011-04-13 |
Family
ID=42167728
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09400058A Active EP2196638B1 (en) | 2008-12-10 | 2009-12-08 | Valve drive for actuating gas exchange valves of combustion engines |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP2196638B1 (en) |
AT (1) | ATE505625T1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012045515A1 (en) * | 2010-10-08 | 2012-04-12 | Schaeffler Technologies AG & Co. KG | Actuator device for adjusting a sliding cam system |
US8584632B2 (en) | 2011-05-16 | 2013-11-19 | Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr | Valve train for internal combustion engines for actuating gas exchange valves |
US8607750B2 (en) | 2011-05-16 | 2013-12-17 | Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr | Device for varying the charge-changing valve lift in an internal combustion engine |
US8904977B2 (en) | 2011-07-27 | 2014-12-09 | Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr | Valve drive for internal combustion engines for actuating gas exchange valves |
WO2015162119A1 (en) * | 2014-04-24 | 2015-10-29 | Avl List Gmbh | Valve actuation device for an internal combustion engine |
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JPH0216312A (en) * | 1988-06-30 | 1990-01-19 | Suzuki Motor Co Ltd | Variable valve timing device |
JPH033907A (en) * | 1989-05-31 | 1991-01-10 | Isuzu Motors Ltd | Variable-valve timing lift device |
DE10054623A1 (en) * | 2000-11-03 | 2002-05-08 | Audi Ag | Device for changeover of cam pack on camshaft to operate gas exchange valves has actuating element in form of pin movable radially outwards and in extended state interacting with slide tracks in guide section |
DE102004033798A1 (en) | 2004-07-12 | 2006-02-09 | Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr | Valve gear for operating of gas exchange valves of internal combustion engines has axially movable shift gate with slot with side walls forming flank which interacts with stop face on axially movable second cam contour |
DE102004055852A1 (en) | 2004-09-30 | 2006-04-13 | Bayerische Motoren Werke Ag | Valve drive for internal combustion engine has switch curve device arranged to apply switching force only when cam device is in basic circle phase |
DE102007010157A1 (en) * | 2007-03-02 | 2008-06-26 | Audi Ag | Valve e.g. inlet valve, drive for internal-combustion engine, has contact pins or connecting link units arranged laterally from cam shaft in housing of internal-combustion engine and movable in axial direction of cam shaft |
-
2009
- 2009-12-08 AT AT09400058T patent/ATE505625T1/en active
- 2009-12-08 EP EP09400058A patent/EP2196638B1/en active Active
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JPH0216312A (en) * | 1988-06-30 | 1990-01-19 | Suzuki Motor Co Ltd | Variable valve timing device |
JPH033907A (en) * | 1989-05-31 | 1991-01-10 | Isuzu Motors Ltd | Variable-valve timing lift device |
DE10054623A1 (en) * | 2000-11-03 | 2002-05-08 | Audi Ag | Device for changeover of cam pack on camshaft to operate gas exchange valves has actuating element in form of pin movable radially outwards and in extended state interacting with slide tracks in guide section |
DE102004033798A1 (en) | 2004-07-12 | 2006-02-09 | Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr | Valve gear for operating of gas exchange valves of internal combustion engines has axially movable shift gate with slot with side walls forming flank which interacts with stop face on axially movable second cam contour |
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DE102007010157A1 (en) * | 2007-03-02 | 2008-06-26 | Audi Ag | Valve e.g. inlet valve, drive for internal-combustion engine, has contact pins or connecting link units arranged laterally from cam shaft in housing of internal-combustion engine and movable in axial direction of cam shaft |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012045515A1 (en) * | 2010-10-08 | 2012-04-12 | Schaeffler Technologies AG & Co. KG | Actuator device for adjusting a sliding cam system |
US9080654B2 (en) | 2010-10-08 | 2015-07-14 | Schaeffler Technologies AG & Co. KG | Actuator device for adjusting a sliding cam system |
US8584632B2 (en) | 2011-05-16 | 2013-11-19 | Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr | Valve train for internal combustion engines for actuating gas exchange valves |
US8607750B2 (en) | 2011-05-16 | 2013-12-17 | Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr | Device for varying the charge-changing valve lift in an internal combustion engine |
US8904977B2 (en) | 2011-07-27 | 2014-12-09 | Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr | Valve drive for internal combustion engines for actuating gas exchange valves |
WO2015162119A1 (en) * | 2014-04-24 | 2015-10-29 | Avl List Gmbh | Valve actuation device for an internal combustion engine |
Also Published As
Publication number | Publication date |
---|---|
EP2196638B1 (en) | 2011-04-13 |
ATE505625T1 (en) | 2011-04-15 |
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