DE102018120540A1 - Variable valve train for reciprocating internal combustion engines - Google Patents
Variable valve train for reciprocating internal combustion engines Download PDFInfo
- Publication number
- DE102018120540A1 DE102018120540A1 DE102018120540.6A DE102018120540A DE102018120540A1 DE 102018120540 A1 DE102018120540 A1 DE 102018120540A1 DE 102018120540 A DE102018120540 A DE 102018120540A DE 102018120540 A1 DE102018120540 A1 DE 102018120540A1
- Authority
- DE
- Germany
- Prior art keywords
- switching strip
- switching
- linear actuator
- variable valve
- valve train
- 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.)
- Withdrawn
Links
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 10
- 238000006073 displacement reaction Methods 0.000 claims abstract description 4
- 238000009434 installation Methods 0.000 description 2
- BUHVIAUBTBOHAG-FOYDDCNASA-N (2r,3r,4s,5r)-2-[6-[[2-(3,5-dimethoxyphenyl)-2-(2-methylphenyl)ethyl]amino]purin-9-yl]-5-(hydroxymethyl)oxolane-3,4-diol Chemical compound COC1=CC(OC)=CC(C(CNC=2C=3N=CN(C=3N=CN=2)[C@H]2[C@@H]([C@H](O)[C@@H](CO)O2)O)C=2C(=CC=CC=2)C)=C1 BUHVIAUBTBOHAG-FOYDDCNASA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 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
- 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
-
- 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
- F01L13/0005—Deactivating valves
-
- 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
- F01L1/26—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder
- F01L1/267—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder with means for varying the timing or the lift of the valves
-
- 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
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/18—Rocking arms or levers
- F01L2001/186—Split rocking arms, e.g. rocker arms having two articulated parts and means for varying the relative position of these parts or for selectively connecting the parts to move in unison
-
- 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
- F01L2013/10—Auxiliary actuators for variable valve timing
- F01L2013/101—Electromagnets
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
Vorgeschlagen ist ein variabler Ventiltrieb einer Hubkolbenbrennkraftmaschine, mit mindestens einem Gaswechselventil pro Zylinder, dessen Ventilhub jeweils durch mindestens einen Nocken einer Nockenwelle vorgegeben und mittels eines schaltbaren Schlepphebels durch eine Axialverschiebung eines in einer Querbohrung geführten und aus einer Seitenwand des Schlepphebels vorstehenden Schaltbolzens selektiv abschaltbar oder auf einen anderen Hubverlauf desselben umschaltbar ist, wobei die Schaltbolzen der Schlepphebel über Verbindungselemente (7) mit zumindest einer Schaltleiste (6) verbunden sind, welche parallel zur Nockenwelle angeordnet sowie mittels zumindest eines Linearaktuators (1) gegen die Kraft zumindest eines Federelements aus einer Ruhestellung in eine Schaltstellung längs verschiebbar ist, wobei der Linearaktuator (1) quer zu einer Schaltleiste (6) maschinenfest angeordnet und mittels seines Stößels (3) mit einem Umlenkhebel (5) in Verbindung steht, wobei der Umlenkhebel (5) maschinenfest geführt ist und mit der Schaltleiste (6) in Wirkverbindung steht und wobei der Linearaktuator (1) mit der Schaltleiste (6), mit zumindest einem, vorzugsweise zwei Verbindungselementen (7) und mit einem Schaltleistengehäuse (4) zu einer modularen Baueinheit ausgebildet ist.A variable valve train of a reciprocating piston internal combustion engine is proposed, with at least one gas exchange valve per cylinder, the valve lift of which is predetermined by at least one cam of a camshaft and can be selectively switched off or on by means of a switchable rocker arm by means of an axial displacement of a switch bolt which is guided in a transverse bore and protrudes from a side wall of the rocker arm another stroke course of the same can be switched, the switching bolts of the rocker arms being connected via connecting elements (7) to at least one switching strip (6) which is arranged parallel to the camshaft and by means of at least one linear actuator (1) against the force of at least one spring element from a rest position in a switching position is longitudinally displaceable, the linear actuator (1) being arranged fixed to the machine transversely to a switching strip (6) and being connected to a deflection lever (5) by means of its tappet (3), the deflection lever (5 ) machine-guided and is operatively connected to the switching strip (6) and the linear actuator (1) with the switching strip (6), with at least one, preferably two connecting elements (7) and with a switching strip housing (4) to form a modular unit is.
Description
Die Erfindung bezieht sich auf einen variablen Ventiltrieb einer Hubkolbenbrennkraftmaschine, mit mindestens einem Gaswechselventil pro Zylinder, dessen Ventilhub jeweils durch mindestens einen Nocken einer Nockenwelle vorgegeben und mittels eines schaltbaren Schlepphebels durch eine Axialverschiebung eines in einer Querbohrung geführten und aus einer Seitenwand des Schlepphebels vorstehenden Schaltbolzens selektiv abschaltbar oder auf einen anderen Hubverlauf desselben umschaltbar ist, wobei die Schaltbolzen der Schlepphebel über Verbindungselemente mit zumindest einer Schaltleiste verbunden sind, welche parallel zur Nockenwelle angeordnet sowie mittels zumindest eines Linearaktuators gegen die Kraft zumindest eines Federelements aus einer Ruhestellung in eine Schaltstellung längs verschiebbar ist.The invention relates to a variable valve train of a reciprocating piston internal combustion engine, with at least one gas exchange valve per cylinder, the valve lift of which is predetermined in each case by at least one cam of a camshaft and by means of a switchable rocker arm by an axial displacement of a shift bolt guided in a transverse bore and projecting from a side wall of the rocker arm can be switched off or switched to another stroke course of the same, the switching bolts of the rocker arms being connected via connecting elements to at least one switching strip which is arranged parallel to the camshaft and can be displaced longitudinally from a rest position into a switching position by means of at least one linear actuator against the force of at least one spring element.
Eine derartige Anordnung eines variablen Ventiltriebes ist in der noch nicht veröffentlichten Patentanmeldung
Aufgabe der Erfindung ist es, diese Nachteile zu beheben und eine Wirkverbindung zwischen Längsaktuator und Schaltleiste zur Verfügung zu stellen, die einen andersartigen Anbau des Linearaktuators an den Zylinderkopf der Brennkraftmaschine ermöglicht. Es soll weiterhin die Möglichkeit eröffnet werden, Gruppen von Schlepphebeln, zumindest die eines Zylinders der Brennkraftmaschine, einzeln zu steuernThe object of the invention is to eliminate these disadvantages and to provide an operative connection between the longitudinal actuator and the switching strip, which enables the linear actuator to be mounted differently on the cylinder head of the internal combustion engine. It should also be possible to individually control groups of rocker arms, at least those of a cylinder of the internal combustion engine
Erfindungsgemäß wird die Aufgabe der Erfindung dadurch gelöst, dass der Linearaktuator quer zu einer Schaltleiste maschinenfest angeordnet ist und mittels seines Stößels mit einem Umlenkhebel in Verbindung steht, dass der Umlenkhebel maschinenfest geführt ist und mit der Schaltleiste in Wirkverbindung steht und dass der Linearaktuator mit der Schaltleiste, mit zumindest einem, vorzugsweise zwei Verbindungselementen und mit einem Schaltleistengehäuse zu einer modularen Baueinheit ausgebildet ist.According to the invention, the object of the invention is achieved in that the linear actuator is arranged fixed to the machine transversely to a switching strip and is connected to a deflection lever by means of its plunger, that the deflection lever is guided in a machine-fixed manner and is operatively connected to the switching strip and that the linear actuator is connected to the switching strip , is formed with at least one, preferably two connecting elements and with a safety edge housing to form a modular unit.
Zum einen hat der Linearaktuator bei einem Quereinbau keine Verlängerung des Zylinderkopfes zur Folge und zum anderen können Module benutzt werden, die aus einer kurzen Schaltleiste mit zwei Verbindungselementen und mit einem eigenen Schaltleistengehäuse ausgestattet sind. Diese Module können im einfachsten Fall in den Deckel des Zylinderkopfes eingesteckt und befestigt werden. Durch die Reduktion der angesteuerten Schlepphebel kann das Modul zum Beispiel von einem Serienzentralventil angesteuert werden, während an einem mehrere Zylinder einer Brennkraftmaschine betätigenden Linearaktuator hohe technische Anforderungen gestellt werden müssen. Weiterhin können die Verbindungselemente einstückig, z. B. durch Umbiegen, an die Schaltleiste angeformt werden.On the one hand, the linear actuator does not result in an extension of the cylinder head when installed transversely, and on the other hand, modules can be used that are equipped with a short safety edge with two connecting elements and their own safety edge housing. In the simplest case, these modules can be inserted and fastened in the cover of the cylinder head. By reducing the actuated rocker arms, the module can be actuated, for example, by a series central valve, while high technical requirements must be made on a linear actuator that actuates several cylinders of an internal combustion engine. Furthermore, the connecting elements in one piece, for. B. be formed by bending on the safety edge.
Der Umlenkhebel steht mit einem Winkelbügel an der Schaltleiste in Verbindung, wobei der Winkelbügel getrennt an der Schaltleiste befestigt oder einstückig an dieser angeformt sein kann. Der Umlenkhebel weist an seinen Enden weiterhin Kontaktbögen auf, deren Hohlfläche dem Stößel zugeordnet ist und deren Bogenfront den Winkelbügel kontaktiert. Dadurch entstehen Stütz- bzw. Druckflächen, die eine möglichst senkrechte Lastrichtung zwischen Stößel und Umlenkhebel sowie zwischen Umlenkhebel und Winkelbügel sicherstellen.The bellcrank is connected to an angle bracket on the safety edge, wherein the angle bracket can be attached separately to the safety edge or integrally formed on it. The deflection lever also has contact arches at its ends, the hollow surface of which is assigned to the tappet and the arc front of which contacts the angle bracket. This creates support or pressure surfaces that ensure a vertical direction of load between the tappet and bell crank as well as between bell crank and angle bracket.
Weiterhin wird vorgeschlagen, dass die Schaltbolzen mittels Federn in Richtung zur Ruhestellung der Schlepphebel belastet sind, die mit Hilfe der Verbindungselemente, der Schaltleiste und dem Umlenkhebel am Linearaktuator als Federelement wirksam sind. Dadurch können einzelne Federn zwischen Schaltleiste und Schaltleistengehäuse entfallen.It is further proposed that the switching bolts are loaded by springs in the direction of the rest position of the rocker arms, which are effective as a spring element on the linear actuator with the aid of the connecting elements, the switching strip and the deflection lever. This eliminates the need for individual springs between the safety edge and the safety edge housing.
Die Erfindung ist in den Zeichnungen beschrieben:
- •
1 zeigt einen Schnitt durch einen Linearaktuator mit einer kurzen Schaltleiste und zwei Verbindungselementen und - •
2 zeigt eine perspektivische Ansicht des Linearaktuators gemäß1 .
- •
1 shows a section through a linear actuator with a short safety edge and two connecting elements and - •
2 shows a perspective view of the linear actuator according to1 ,
In den
BezugszeichenlisteLIST OF REFERENCE NUMBERS
- 1)1)
- Linearaktuatorlinear actuator
- 2)2)
- Polkernpole core
- 3)3)
- Stößeltappet
- 4)4)
- SchaltleistengehäuseSafety Edges housing
- 5)5)
- UmlenkhebelUmlenkhebel
- 6)6)
- SchaltleisteSafety Edge
- 7)7)
- Verbindungselementefasteners
- 8)8th)
- Winkelbügelangle bracket
- 9)9)
- Kontaktbögencontact sheets
ZITATE ENTHALTEN IN DER BESCHREIBUNG QUOTES INCLUDE IN THE DESCRIPTION
Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list of documents listed by the applicant has been generated automatically and is only included for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
Zitierte PatentliteraturPatent literature cited
- DE 102017101792 [0002]DE 102017101792 [0002]
Claims (6)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102018120540.6A DE102018120540A1 (en) | 2018-08-23 | 2018-08-23 | Variable valve train for reciprocating internal combustion engines |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102018120540.6A DE102018120540A1 (en) | 2018-08-23 | 2018-08-23 | Variable valve train for reciprocating internal combustion engines |
Publications (1)
Publication Number | Publication Date |
---|---|
DE102018120540A1 true DE102018120540A1 (en) | 2020-02-27 |
Family
ID=69412533
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE102018120540.6A Withdrawn DE102018120540A1 (en) | 2018-08-23 | 2018-08-23 | Variable valve train for reciprocating internal combustion engines |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE102018120540A1 (en) |
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2018
- 2018-08-23 DE DE102018120540.6A patent/DE102018120540A1/en not_active Withdrawn
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
R119 | Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee |