EP3673157B1 - Valve drive for an internal combustion engine - Google Patents
Valve drive for an internal combustion engine Download PDFInfo
- Publication number
- EP3673157B1 EP3673157B1 EP18742452.8A EP18742452A EP3673157B1 EP 3673157 B1 EP3673157 B1 EP 3673157B1 EP 18742452 A EP18742452 A EP 18742452A EP 3673157 B1 EP3673157 B1 EP 3673157B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- camshaft
- cam
- slotted guide
- cam curve
- axial
- 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.)
- Active
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- 238000002485 combustion reaction Methods 0.000 title claims description 12
- 238000005096 rolling process Methods 0.000 claims 1
- 230000007246 mechanism Effects 0.000 description 6
- 238000006073 displacement reaction Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000000969 carrier Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000004381 surface treatment Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000036316 preload 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
-
- 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
- F01L1/053—Camshafts overhead type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/18—Rocking arms or levers
- F01L1/185—Overhead end-pivot rocking arms
-
- 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
-
- 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
- F01L2001/0476—Camshaft bearings
-
- 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 a cylinder head of an internal combustion engine with the features of the preamble of patent claim 1.
- sliding cams is from the German disclosure document EN 10 2005 006 489 A1 known. It is a camshaft arrangement that has a base shaft and cam carriers arranged on it that are axially displaceable but held in a rotationally fixed manner. Cams with several cam curves are formed on the cam carriers, each of which has a common base circle and different cam curves that have different curve profiles. The cams actuate valve actuating means of associated cylinders. Actuators are provided for carrying out switching processes, whereby during the switching processes, another of the cam curves of the cam comes into contact with the valve actuating means by axially displacing cam carriers on the base shaft.
- valve train for an internal combustion engine is known.
- This valve train comprises a camshaft with a sliding cam device, which has adjacent cam tracks acting on valves with different cam shapes and lifting curves, which lifting curves work together with actuating elements having control pins for adjusting the sliding cam device.
- a valve train for a cylinder head of an internal combustion engine is known, with a first camshaft rotatably mounted in a first and a second camshaft bearing, with at least one cam with a first cam curve and a second cam curve that is different from the first cam curve.
- a gas exchange valve can be actuated with the first or the second cam curve, wherein a camshaft section is provided with which the cam can be displaced via an adjusting means such that the gas exchange valve can be actuated via either the first or the second cam curve.
- the first camshaft and the cam have a fixed position relative to one another and the first camshaft can be axially displaced in the first and the second camshaft bearing, wherein an axial lock is provided for the camshaft.
- German Disclosure Document EN 10 2015 012 287 A1 the international patent application WO 2012/079794 A1 , the US patent application US 2016/0090921 A1 and the German Disclosure Document EN 10 2007 061 353 A1 deal with axially sliding camshafts.
- valve trains A disadvantage of the above-mentioned valve trains is their axial locking mechanisms, which are susceptible to wear.
- the object of the present invention is to avoid the above-mentioned disadvantage.
- a further object of the present invention is to prevent axial displacement of the camshaft during operation of the internal combustion engine.
- the proposed axial locking mechanism can minimize the relative movement of the camshaft to the actuating means that occurs when the internal combustion engine is operating.
- a particular advantage is that the axial locking mechanism is a guide rail that runs radially around the camshaft with a first and a second guide rail that are axially adjacent to one another and into which a locking element pre-tensioned by a spring element engages. Simple switching of the switching camshaft with simultaneous locking in the end positions is possible because the first and second guide rails are spaced apart from one another by a cylindrical section.
- the angular range according to claim 2 is a particularly preferred angular range.
- Figure 1 shows a top view of a valve train 1 according to the invention for a cylinder head of an internal combustion engine.
- the cylinder head which is not numbered, is shown without a valve cover so that the valve train 1 is visible.
- the valve train 1 is arranged on the inlet side and is designed for two cylinders with four equally acting, Fig.2 shown gas exchange valves are provided.
- the valve train 1 has a first camshaft 4 which is rotatably mounted in a first and a second camshaft bearing 2, 3 and further camshaft bearings which are not numbered.
- a second camshaft which is not numbered is provided on the exhaust side.
- the first camshaft 4 has four cams 5 for four gas exchange valves (not shown) for two cylinders of the internal combustion engine, with only one cam 5 being numbered.
- the cam 5 has a first cam curve 6 and a second cam curve 7 which is different from the first cam curve 6.
- the gas exchange valve can be actuated by either the first or the second cam curve 6, 7 via an intermediate element, such as a sliding rocker arm.
- a camshaft section 8 is provided, with radially outwardly encircling control grooves into which an invisible pin of an actuating means 9 engages, so that the camshaft 4 with the cam 5 can be displaced in such a way that the gas exchange valve can be actuated either via the first or the second cam curve 6, 7.
- the camshaft 4 and the cam 5 are preferably made of the same material and are one piece. In a further embodiment, the cam can also be shrunk or joined onto the camshaft 4.
- a spur gear 17 is provided to drive the camshaft 4, which can be driven by another, unnumbered gear.
- an axial locking device 10 shown in the following figures is provided for the axially displaceable camshaft 4.
- FIG 2 shows a top view of the axial locking device 10 for the first camshaft 4.
- the first camshaft 4 has Figure 2 two cams 5, whereby only one cam 5 is numbered.
- Gas exchange valves 19 can also be seen, each with a valve spring 20, of which only one is numbered.
- a drive gear, the spur gear, for the camshaft 4 is again numbered 17.
- the axial locking 10 is a Figure 4 shown radially encircling the camshaft 4 with a first and a second, axially adjacent guide track 12, 13, into which a locking element 15 pre-tensioned by a spring element 14 engages.
- the locking element 15 pre-tensioned by the spring element 14 is arranged in a bracket 21.
- the axial locking 10 is mounted on the first camshaft 4 with a screw connection 18.
- Figure 3 shows a section through the bracket 21 with the locking element 15 pre-tensioned by the spring element 14.
- the bracket 21 has two fastening holes 23.
- the locking element 15 is a pin pre-tensioned by the spring 14, the pre-tension being adjustable by a cap nut 22.
- Figure 4 shows a section through the axial locking mechanism 10 without the pre-tensioned locking element 15.
- the guide 11 with the first and second axially adjacent guide tracks 12, 13 is mounted radially on the camshaft 4 in the present exemplary embodiment via a roller bearing 25, in the present exemplary embodiment a ball bearing. In another exemplary embodiment, it can also be a plain bearing.
- a camshaft axis is numbered 16.
- An angle between the second guide track 13 and the camshaft axis 16 is designated ⁇ .
- the first and second guide tracks 12, 13 are axially spaced from one another by a cylindrical section 24.
- the first and second guide tracks 12, 13 form an angle of between 2° and 45° with the camshaft axis 16.
- Figure 5 shows a section through the locking element 15 and the guide 11.
- the preload by the spring element 14 is shown by an arrow on the locking element 15 in the direction of the guide 11.
- a displacement path of the locking element 15 over the guide 11 is numbered 26.
- This displacement path 26 corresponds to the width of a cam curve 6, 7.
- An angle between the guide tracks 12, 13 is numbered ⁇ .
- the guide 11 has an axial groove via the guide tracks 12, 13 and the cylindrical section 24, in which the locking element 15 is axially displaceable.
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)
Description
Die Erfindung betrifft einen Ventiltrieb für einen Zylinderkopf einer Brennkraftmaschine mit den Merkmalen aus dem Oberbegriff des Patentanspruchs 1.The invention relates to a valve train for a cylinder head of an internal combustion engine with the features of the preamble of patent claim 1.
Zum technischen Umfeld wird beispielsweise auf die Europäische Patentanmeldung
Ein weiteres Beispiel für Schiebenocken ist beispielsweise aus der Deutschen Offenlegungsschrift
Aus der Deutschen Offenlegungsschrift
Weiter wird auf die Deutsche Patentschrift
- Bereitstellen eines stabförmigen Nockenwellengrundkörpers,
- Bearbeitung des Nockenwellengrundkörpers durch
- Oberflächenbearbeitung des Nockenwellengrundkörpers in zumindest einem ersten axialen Teilabschnitt durch Einbringung eines sich in axialer Richtung erstreckenden Außenoberflächenprofils,
- Oberflächenbearbeitung des Nockenwellengrundkörpers in zumindest einem, dem ersten Teilabschnitt in einer vorbestimmten Auffädelrichtung gesehen nachgelagerten, zweiten axialen Teilabschnitt, durch zumindest bereichsweises Aufweiten des Nockenwellengrundkörpers auf einen erweiterten Außendurchmesser,
- Bereitstellung einer Mehrzahl von Nockenelementen mit einem Nabenquerschnitt und einem in axialer Richtung sich erstreckenden und mit dem Außenoberflächenprofil des Nockenwellengrundkörpers korrelierenden Innenoberflächenprofils, wobei der Nabenquerschnitt einen minimalen Innendurchmesser aufweist, der kleiner als der maximale Außendurchmesser im zweiten Teilabschnitt des Nockenwellengrundkörpers bemessen ist,
- Montage der Nockenelemente, wobei
- Zumindest ein erstes Nockenelement in Auffädelrichtung über den zumindest einen ersten axialen Teilabschnitt hinweg bis vor den aufgeweiteten Bereich des zumindest einen zweiten axialen Teilabschnitts auf den Nockenwellengrundkörper aufgeschoben wird, d aufgeschobene Nockenelement zu einer vorbestimmten Bezugsposition des Nockenwellengrundkörpers winkelgenau ausgerichtet und durch anschließende axiale Relativbewegung zwischen Nockenelement und Nockenwellengrundkörper kraftformschlüssig mit dem Nockenwellengrundkörper verbunden wird, und wobei anschließend
- Zumindest ein zweites Nockenelement winkelausgerichtet in Auffädelrichtung bis zu den zumindest einen ersten Teilabschnitt auf den Nockenwellengrundkörper aufgeschoben und dort drehfest und axial verschiebbar positioniert wird.
- Providing a rod-shaped camshaft base body,
- Machining of the camshaft base body by
- Surface treatment of the camshaft base body in at least a first axial section by introducing an outer surface profile extending in the axial direction,
- Surface treatment of the camshaft base body in at least one second axial section downstream of the first section in a predetermined threading direction, by at least partially widening the camshaft base body to an enlarged outer diameter,
- Providing a plurality of cam elements with a hub cross-section and an inner surface profile extending in the axial direction and correlating with the outer surface profile of the camshaft base body, wherein the hub cross-section has a minimum inner diameter which is smaller than the maximum outer diameter in the second subsection of the camshaft base body,
- Assembly of the cam elements, whereby
- At least one first cam element is pushed onto the camshaft base body in the threading direction over the at least one first axial section up to the widened area of the at least one second axial section, the pushed-on cam element is aligned at an angle to a predetermined reference position of the camshaft base body and is connected to the camshaft base body in a force-fitting manner by subsequent axial relative movement between the cam element and the camshaft base body, and wherein subsequently
- At least one second cam element is pushed onto the camshaft base body in an angularly aligned manner in the threading direction up to the at least one first partial section and is positioned there in a rotationally fixed and axially displaceable manner.
Aus der Deutschen Offenlegungsschrift
Auch die Deutsche Offenlegungsschrift
Nachteilig an den o. g. Ventiltrieben sind deren verschleißanfällige Axialarretierungen.A disadvantage of the above-mentioned valve trains is their axial locking mechanisms, which are susceptible to wear.
Aufgabe der vorliegenden Erfindung ist es, oben genannten Nachteil zu vermeiden. Eine weitere Aufgabe der vorliegenden Erfindung ist es, eine axiale Verschiebung der Nockenwelle beim Betrieb der Brennkraftmaschine zu verhindern.The object of the present invention is to avoid the above-mentioned disadvantage. A further object of the present invention is to prevent axial displacement of the camshaft during operation of the internal combustion engine.
Diese Aufgaben werden durch die Merkmale gemäß Patentanspruch 1 gelöst.These objects are achieved by the features according to patent claim 1.
Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen beschrieben.Advantageous developments of the invention are described in the subclaims.
Aufgrund der einstückigen, axial verschiebbaren Nockenwelle werden wegen der fehlenden Axialverzahnung die Herstellkosten wesentlich reduziert und die akustischen Probleme vermieden. Weiter kann aufgrund der vorgeschlagenen Axialarretierung eine beim Betrieb der Brennkraftmaschine entstehende Relativbewegung der Nockenwelle zu dem Stellmittel minimiert werden. Von besonderem Vorteil ist, dass die Axialarretierung eine radial um die Nockenwelle umlaufende Kulisse mit einer ersten und einer zweiten, axial zueinander benachbarten Kulissenbahn ist, in die ein durch ein Federelement vorgespanntes Arretierelement eingreift. Ein einfaches Schalten der Schaltnockenwelle mit gleichzeitiger Arretierung in den Endlagen ist dadurch möglich, dass die erste und die zweite Kulissenbahn durch einen zylindrischen Abschnitt voneinander beabstandet sind.Due to the one-piece, axially movable camshaft, the manufacturing costs are significantly reduced and acoustic problems are avoided due to the lack of axial gearing. Furthermore, the proposed axial locking mechanism can minimize the relative movement of the camshaft to the actuating means that occurs when the internal combustion engine is operating. A particular advantage is that the axial locking mechanism is a guide rail that runs radially around the camshaft with a first and a second guide rail that are axially adjacent to one another and into which a locking element pre-tensioned by a spring element engages. Simple switching of the switching camshaft with simultaneous locking in the end positions is possible because the first and second guide rails are spaced apart from one another by a cylindrical section.
Der Winkelbereich gemäß Patentanspruch 2 ist ein besonders bevorzugter Winkelbereich.The angular range according to claim 2 is a particularly preferred angular range.
Mit der Ausgestaltung gemäß Patentanspruch 3 wird die Reibung nochmals minimiert.With the design according to patent claim 3, the friction is further minimized.
Mit der Ausgestaltung gemäß Patentanspruch 4 wird der Schaltvorgang deutlich vereinfacht und der Verschleiß minimiert.With the design according to
Im Folgenden ist die Erfindung anhand eines Ausführungsbeispiels in fünf Figuren näher erläutert.
- Figur 1
- zeigt eine Aufsicht auf einen erfindungsgemäßen Ventiltrieb.
- Figur 2
- zeigt eine Aufsicht auf den erfindungsgemäßen Ventiltrieb mit einer Arretiervorrichtung.
- Figur 3
- zeigt einen Schnitt durch ein Arretierelement der Axialarretierung.
Figur 4- zeigt einen Schnitt durch die Axialarretierung.
Figur 5- zeigt einen Schnitt durch das Arretierelement in Wirkverbindung mit der Axialarretierung.
- Figure 1
- shows a plan view of a valve train according to the invention.
- Figure 2
- shows a plan view of the valve train according to the invention with a locking device.
- Figure 3
- shows a section through a locking element of the axial locking.
- Figure 4
- shows a section through the axial locking mechanism.
- Figure 5
- shows a section through the locking element in operative connection with the axial locking mechanism.
Im Folgenden gelten in den
Der erfindungsgemäße Ventiltrieb 1 weist eine in einem ersten und einem zweiten Nockenwellenlager 2, 3 und weiteren, nicht bezifferten Nockenwellenlagern drehbar gelagerte erste Nockenwelle 4 auf. Auslassseitig ist eine zweite, nicht bezifferte Nockenwelle vorgesehen. Die erste Nockenwelle 4 weist in dem vorliegenden Ausführungsbeispiel vier Nocken 5 für vier nicht dargestellte Gaswechselventile für zwei Zylinder der Brennkraftmaschine auf, wobei nur eine Nocke 5 beziffert ist. Die Nocke 5 weist eine erste Nockenkurve 6 und eine zweite, von der ersten Nockenkurve 6 unterschiedliche Nockenkurve 7 auf. Beim Betrieb der Brennkraftmaschine ist das Gaswechselventil über ein Zwischenelement, wie z. B. ein Gleitschlepphebel, entweder von der ersten oder von der zweiten Nockenkurve 6, 7, betätigbar.The valve train 1 according to the invention has a
Weiter ist ein Nockenwellenabschnitt 8 vorgesehen, mit radial außen umlaufenden Steuernuten in die ein nicht sichtbarer Stift eines Stellmittels 9 eingreift, so dass die Nockenwelle 4 mit der Nocke 5 derart verschiebbar ist, dass das Gaswechselventil entweder über die erste oder die zweite Nockenkurve 6, 7 betätigbar ist.Furthermore, a
Die Nockenwelle 4 und der Nocken 5 sind bevorzugt materialeinheitlich und einstückig. In einer weiteren Ausführungsform kann der Nocken auch auf die Nockenwelle 4 aufgeschrumpft oder gefügt sein. Zum Antrieb der Nockenwelle 4 ist ein Stirnzahnrad 17 vorgesehen, welches von einem weiteren, nicht bezifferten Zahnrad antreibbar ist.The
Um beim Betrieb der Brennkraftmaschine die Belastung des Stifts des Stellmittels 9 zu reduzieren, ist erfindungsgemäß eine in den folgenden Figuren dargestellte Axialarretierung 10 für die axial verschiebbare Nockenwelle 4 vorgesehen.In order to reduce the load on the pin of the actuating means 9 during operation of the internal combustion engine, an
In einem weiteren besonders bevorzugten Ausführungsbeispiel weist die Kulisse 11 über die Kulissenbahnen 12, 13 und den zylindrischen Abschnitt 24 eine axiale Nut auf, in der das Arretierelement 15 axial verschiebbar ist.In a further particularly preferred embodiment, the guide 11 has an axial groove via the guide tracks 12, 13 and the
Durch die Verwendung der erfindungsgemäßen Axialarretierung 10 kann eine entstehende Relativbewegung der ersten Nockenwelle 4 zu dem Stift des Stellelements 9 minimiert werden. Dies macht eine einteilige Schiebenockenwelle möglich.By using the
- 11
- VentiltriebValve train
- 22
- erstes Nockenwellenlagerfirst camshaft bearing
- 33
- zweites Nockenwellenlagersecond camshaft bearing
- 44
- erste Nockenwellefirst camshaft
- 5.5.
- NockeCam
- 6.6.
- erste Nockenkurvefirst cam curve
- 7.7.
- zweite Nockenkurvesecond cam curve
- 8.8th.
- NockenwellenabschnittCamshaft section
- 9.9.
- StellmittelSettling agent
- 10.10.
- AxialarretierungAxial locking
- 11.11.
- KulisseScenery
- 12.12.
- erste Kulissenbahnfirst slide track
- 13.13.
- zweite Kulissenbahnsecond slide track
- 14.14.
- FederelementSpring element
- 15.15.
- ArretierelementLocking element
- 16.16.
- NockenwellenachseCamshaft axis
- 17.17.
- StirnzahnradSpur gear
- 18.18.
- VerschraubungScrew connection
- 19.19.
- GaswechselventilGas exchange valve
- 20.20.
- VentilfederValve spring
- 21.21.
- Bügelhanger
- 22.22.
- HutmutterCap nut
- 23.23.
- BefestigungsbohrungMounting hole
- 24.24.
- zylindrischer Abschnittcylindrical section
- 25.25.
- Wälzlagerroller bearing
- 26.26.
- VerschiebewegDisplacement path
- αα
- Winkel zwischen Nockenwellenachse und KulissenbahnAngle between camshaft axis and cam track
- ββ
- Winkel zwischen den KulissenbahnenAngle between the slide tracks
Claims (3)
- Valve drive (1) for a cylinder head of an internal combustion engine, having a first camshaft (4), which is rotatably mounted in a first (2) and a second camshaft bearing (3) and which has at least one cam (5) with a first cam curve (6) and a second cam curve (7) that differs from the first cam curve (6), wherein a gas exchange valve can be actuated by the first or the second cam curve (6, 7), wherein a camshaft section (8) is provided, by means of which the cam (5) can be moved by an adjusting means (9) in such a way that the gas exchange valve can be actuated either via the first or the second cam curve (6, 7),
wherein the first camshaft (4) and the cam (5) have a fixed position with respect to one another, and the first camshaft (4) can be displaced axially in the first and the second camshaft bearing (2, 3), wherein an axial locking means (10) is provided for the camshaft (4), wherein the axial locking means (10) is a slotted guide (11) which runs radially around the cam shaft (4) and has a first and a second slotted guide track (12, 13) which are axially adjacent with respect to one another and into which a locking element (15) which is preloaded by a spring element (14) engages, and characterized in that the first and the second slotted guide track (12, 13) are spaced apart from one another by a cylindrical section (24), and in that the slotted guide (11) has an axial groove over the slotted guide tracks (12, 13) and the cylindrical section (14). - Valve drive according to Claim 1,
characterized in that the first and the second slotted guide track (12, 13) each form an opposing angle α of between 2° and 45° with a camshaft axis (16). - Valve drive according to either of Patent Claims 1 or 2,
characterized in that the slotted guide (11) is provided with rolling or sliding bearing support on the camshaft (4) .
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102017214793.8A DE102017214793A1 (en) | 2017-08-24 | 2017-08-24 | Valve train for an internal combustion engine |
PCT/EP2018/069085 WO2019037945A1 (en) | 2017-08-24 | 2018-07-13 | Valve drive for an internal combustion engine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3673157A1 EP3673157A1 (en) | 2020-07-01 |
EP3673157B1 true EP3673157B1 (en) | 2024-05-29 |
Family
ID=62948103
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18742452.8A Active EP3673157B1 (en) | 2017-08-24 | 2018-07-13 | Valve drive for an internal combustion engine |
Country Status (5)
Country | Link |
---|---|
US (1) | US11002162B2 (en) |
EP (1) | EP3673157B1 (en) |
CN (1) | CN110753784B (en) |
DE (1) | DE102017214793A1 (en) |
WO (1) | WO2019037945A1 (en) |
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DE4236655A1 (en) | 1992-10-30 | 1994-05-05 | Porsche Ag | Valve drive for an internal combustion engine |
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DE102005006489B4 (en) | 2005-02-12 | 2015-11-19 | Audi Ag | camshaft arrangement |
DE102007061353A1 (en) * | 2007-12-21 | 2009-06-25 | Audi Ag | Valve drive unit for improving the thermodynamics of combustion engines comprises units for axially moving cam supports on a camshaft and having a peripheral endless groove and a meshing element which moves along the groove |
DE102009057633B3 (en) | 2009-12-09 | 2011-03-31 | Thyssenkrupp Presta Teccenter Ag | Method of making a built camshaft, camshaft body and camshaft |
DE102010063389A1 (en) * | 2010-12-17 | 2012-06-21 | Schaeffler Technologies Gmbh & Co. Kg | Adjustment system for gas exchange valves of reciprocating internal combustion engines |
DE102011011456A1 (en) * | 2011-02-17 | 2012-08-23 | Daimler Ag | Internal combustion engine valve train device |
DE102011101400B4 (en) * | 2011-05-13 | 2013-02-07 | Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr | Valve train for internal combustion engines for actuating gas exchange valves |
US9745875B2 (en) * | 2012-08-22 | 2017-08-29 | Toyota Jidosha Kabushiki Kaisha | Variable valve gear for internal combustion engine |
DE102013111410A1 (en) * | 2013-10-16 | 2015-04-16 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Valve train for an internal combustion engine and internal combustion engine |
KR101461906B1 (en) * | 2013-10-16 | 2014-11-17 | 현대자동차주식회사 | Connecting structure of mutiple variable valve lift appratus |
JP6331926B2 (en) * | 2014-09-26 | 2018-05-30 | スズキ株式会社 | Variable valve operating device for internal combustion engine |
KR101619251B1 (en) * | 2014-09-30 | 2016-05-10 | 현대자동차 주식회사 | Engine practicable cda |
US9500104B2 (en) * | 2014-09-30 | 2016-11-22 | Hyundai Motor Company | Variable valve lift apparatus |
DE102015103761A1 (en) * | 2015-03-13 | 2016-09-29 | Kendrion (Villingen) Gmbh | Control element for the axial displacement of a camshaft slidably mounted along a camshaft axis |
DE102015012287A1 (en) * | 2015-09-23 | 2017-03-23 | Audi Ag | Valve train for an internal combustion engine |
JP6686454B2 (en) * | 2016-01-12 | 2020-04-22 | いすゞ自動車株式会社 | Cam switching device |
DE102016200424A1 (en) * | 2016-01-15 | 2017-07-20 | Schaeffler Technologies AG & Co. KG | Variable valve train |
DE102016206060A1 (en) * | 2016-04-12 | 2017-10-12 | Schaeffler Technologies AG & Co. KG | Variable valve train |
DE102016208392A1 (en) * | 2016-05-17 | 2017-11-23 | Schaeffler Technologies AG & Co. KG | camshaft |
-
2017
- 2017-08-24 DE DE102017214793.8A patent/DE102017214793A1/en active Pending
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2018
- 2018-07-13 CN CN201880040499.5A patent/CN110753784B/en active Active
- 2018-07-13 EP EP18742452.8A patent/EP3673157B1/en active Active
- 2018-07-13 WO PCT/EP2018/069085 patent/WO2019037945A1/en unknown
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- 2020-02-21 US US16/797,169 patent/US11002162B2/en active Active
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US11002162B2 (en) | 2021-05-11 |
EP3673157A1 (en) | 2020-07-01 |
WO2019037945A1 (en) | 2019-02-28 |
US20200191025A1 (en) | 2020-06-18 |
CN110753784B (en) | 2021-09-03 |
DE102017214793A1 (en) | 2019-02-28 |
CN110753784A (en) | 2020-02-04 |
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