DE102012217297A1 - Sliding cam system for combustion engine, has left and right electroactive polymer actuators for displacing cam piece and comprising electroactive polymer that is stretched for creation of electric voltage - Google Patents

Sliding cam system for combustion engine, has left and right electroactive polymer actuators for displacing cam piece and comprising electroactive polymer that is stretched for creation of electric voltage Download PDF

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Publication number
DE102012217297A1
DE102012217297A1 DE201210217297 DE102012217297A DE102012217297A1 DE 102012217297 A1 DE102012217297 A1 DE 102012217297A1 DE 201210217297 DE201210217297 DE 201210217297 DE 102012217297 A DE102012217297 A DE 102012217297A DE 102012217297 A1 DE102012217297 A1 DE 102012217297A1
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Prior art keywords
cam piece
electroactive polymer
cam
creation
piece
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German (de)
Inventor
Klaus Daut
Christoph Ross
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Schaeffler Technologies AG and Co KG
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Schaeffler Technologies AG and Co KG
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    • 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
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
    • F03G7/00—Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for
    • F03G7/005—Electro-chemical actuators; Actuators having a material for absorbing or desorbing gas, e.g. a metal hydride; Actuators using the difference in osmotic pressure between fluids; Actuators with elements stretchable when contacted with liquid rich in ions, with UV light, with a salt solution
    • 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
    • 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
    • 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
    • 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
    • F01L2301/00—Using particular materials
    • 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
    • F01L2303/00—Manufacturing of components used in valve arrangements
    • 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
    • F01L2820/00—Details on specific features characterising valve gear arrangements
    • F01L2820/01—Absolute values
    • 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
    • F01L2820/00—Details on specific features characterising valve gear arrangements
    • F01L2820/03—Auxiliary actuators

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Analytical Chemistry (AREA)
  • Valve Device For Special Equipments (AREA)

Abstract

The system has a sliding cam piece (7) axial-displaceably supported on a spline shaft (8) in a torque-proof manner. Left and right electroactive polymer (EAP) actuators (3, 5) displace the cam piece and comprise electroactive polymer that is stretched for creation of an electric voltage. The cam piece is supported in a cross-roller bearing and positively connected with the spline shaft. A hole is formed in the spline shaft for retaining a detent ball together with a spring. Outer rings are arranged over cross rollers, and an inner ring is mounted on the cam piece.

Description

Die Erfindung betrifft ein Schiebenockensystem in einer Brennkraftmaschine, wie es grundsätzlich aus der DE 101 48 177 A1 bekannt ist. Bei den meisten Anwendungen werden zwischen den Nocken, schräg verlaufende Nuten zur Verschiebung des Nockenstückes verwendet. Nach dem Verschiebevorgang der Nocken wird die Position mit einer Rastierung meist im inneren der Keilwelle fixiert.The invention relates to a sliding cam system in an internal combustion engine, as it is basically from the DE 101 48 177 A1 is known. In most applications, between the cams, slanted grooves are used to move the cam piece. After the displacement operation of the cam, the position is usually fixed with a detent in the interior of the spline.

Die Aktuatoren welche die Nocken verschieben, verschleißen meist vorzeitig im Bereich in dem der Pin an den extremen Krümmungen der Verschiebenut anläuft. Mit ein Grund dafür ist der Umstand, daß die Verschiebekräfte aus Gründen der Kollisionsvermeidung über einen extrem kleinen Nockenwellendrehwinkel aufgenommen werden müssen. Reibverluste entstehen dadurch, daß die Verschiebekräfte sich über die Keilwelle ausbreiten. Die Ventilschäfte drücken über die Ventilfedern gegen das Nockenstück. Das wiederum liegt formschlüssig an der Keilwelle an. Diese Verspannung muß durch den Pin überkompensiert werden. Ferner verfügt das Nockenstück über kein eigenes Lagersystem. Das Gleitlager der Keilwelle (Stahl auf Stahl) stellt indirekt das Koordinatensystem des Nockenstücks. Im Betrieb kommt es somit zu einer Verbiegung der Keilwelle im dauerelastischen Bereich, welche jeweils in der Mitte des Nockenstückes seinen höchsten Punkt erfährt. Diese Verbiegungen führen zu Ungenauigkeiten bei der Auslegung des Nockentriebes bzw. werden im Vorfeld berechnet und im Koordinatensystem eingerechnet und ebenfalls kompensiert. Dies führt zu Verlusten.The actuators which move the cams, wear out prematurely in the area in which the pin starts at the extreme curvatures of the sliding groove. One reason for this is the fact that the displacement forces must be taken over an extremely small camshaft rotation angle for reasons of collision avoidance. Frictional losses occur in that the displacement forces spread over the spline. The valve stems press against the cam piece via the valve springs. This, in turn, lies positively against the splined shaft. This tension must be overcompensated by the pin. Furthermore, the cam piece does not have its own storage system. The slide bearing of the splined shaft (steel on steel) indirectly represents the coordinate system of the cam piece. In operation, it comes thus to a bending of the spline in the permanently elastic range, which experiences its highest point in each case in the middle of the cam piece. These bends lead to inaccuracies in the design of the cam gear or are calculated in advance and included in the coordinate system and also compensated. This leads to losses.

Auch zu erwähnen ist, daß die Keilwelle relativ „kräftig” ausgeführt werden muß um diesen Anforderungen standhalten zu können.It should also be mentioned that the spline shaft must be relatively "powerful" to be able to withstand these requirements.

Aufgabe der ErfindungObject of the invention

  • 1. Erstellung eines eigenen Koordinatensystems für ein Nockenstück.1. Creation of a separate coordinate system for a cam piece.
  • 2. Erstellung eines reibungsärmeren Verschiebesystem für Nockenstücke.2. Creation of a lower friction displacement system for cam pieces.
  • 3. Vereinfachung der Aktorik3. Simplification of the actuators
  • 4. Elektrische Ansteuerung der Aktorik 4. Electrical control of the actuators
  • 5. Abwälzung der Rotativbewegung des Nockenstückes im Lager5. passing the rotational movement of the cam piece in the camp
  • 6. Reduktion der Reibung in der Keilwelle6. Reduction of friction in the spline shaft
  • 7. Verschleißreduktion des Gesamtsystems7. Wear reduction of the entire system
  • 8. Hochgenau reproduzierbare und entsprechend ausreichend schnelle Verschiebezeiten des Nockenstückes8. Highly reproducible and correspondingly sufficiently fast displacement times of the cam piece
  • 9. Hochgenau reproduzierbare und entsprechend ausreichend schnelle Verschiebegeschwindigkeiten des Nockenstückes9. Highly reproducible and correspondingly sufficiently fast displacement speeds of the cam piece
  • 10. Vollvariable, hochgenaue Verschiebepositionen für Nockenstücke im Hinblick auf weitere Entwicklungen hin zur Raumnocke10. Full variable, highly accurate displacement positions for cam pieces in view of further developments towards Raumnocke
  • 11. Einfache Integrierbarkeit in bestehende Motoren11. Easy to integrate into existing engines
  • 12. Optimale Ausnutzung des vorhandenen Bauraums12. Optimum utilization of the available installation space

Zusammenfassung der ErfindungSummary of the invention

Einsatz von EAP-Aktuatoren mit Verzichten auf die Steuernuten in die heute der Pin des Magnetaktors einrastet (EAP ist die Abkürzung für die an sich bekannten Elektroaktiven Polymere). Verwendung eines Kreuzrollenverbandes zur Wälzlagerung des Nockenstückes. Hierbei ist zu berücksichtigen, daß auch eine andere Form der Verschiebeaktion angewandt werden kann. Eine Gleitbuchse beispielsweise aus Permaglide-Material lässt die Verschiebung reibungsminimiert vollziehen. Die Keilwelle kann mit und ohne Rastierungen ausgerüstet sein.Use of EAP actuators with no need for the control grooves into which the pin of the magnetic actuator engages today (EAP is the abbreviation for the electroactive polymers known per se). Use of a cross roller dressing for roller bearing of the cam piece. It should be noted that another form of shifting reaction can be used. A sliding bushing, for example, made of Permaglide material makes the shift friction minimized. The splined shaft can be equipped with and without detents.

Zeichnung 1 als Schnittdarstellung der Schiebenocke: das Schiebenockenstück (Pos: 7) ist formschlüssig mit der Keilwelle (Pos: 8) verbunden. Der Formschluß lässt eine gleitende Verschiebung (großzügige Spielpassung) des Nockenstückes zu. Das Schiebenockenstück beinhaltet links und rechts die drei Nockenkonturen mit den aus der Motorenabstimmung definierten Nockengeometrien. Idealerweise können bei einer gebauten Variante diese beiden Teilbereiche aus Gleichteilen bestehen.Drawing 1 as a sectional view of the sliding cam: the sliding cam piece (Pos: 7 ) is positively connected to the spline (Pos: 8th ) connected. The positive engagement allows a sliding displacement (generous clearance) of the cam piece. The sliding cam piece contains on the left and right the three cam contours with the cam geometries defined from the engine tuning. Ideally, in a built variant, these two sections may consist of identical parts.

In der Keilwelle ist eine Bohrung zur Aufnahme der Rastierkugel nebst Feder untergebracht. Diese rastet im Einstich des Nockenstückes ein. Welches wiederum die drei (variable Anzahl möglich bis hin zur vollvariablen Raumnocke) Einzelnocken positioniert. Kommt im Rahmen dieser Erfindung keine Rastierkugel zum Einsatz, dann kann die axiale Position auch durch ein Kräftegleichgewicht der Aktoren gesichert werden.In the spline a hole for receiving the Rastierkugel is housed together with spring. This snaps into the groove of the cam piece. Which in turn positions the three (variable number possible up to the fully variable space cam) single cam. If no detent ball is used in the context of this invention, then the axial position can also be secured by a force equilibrium of the actuators.

Bei der Raumnocke fehlt die Sektion der Rastierung bzw. kann durch eine sogenannte Mittelposition welche als „Parkplatz” dient ersetzt werden. Parkplatz deshalb weil bei Motorstop oder Störung ein definierter Zustand hergestellt werden kann.In the space cam, the section of the detent is missing or can be replaced by a so-called middle position which serves as a "parking space". Parking because a defined state can be established at engine stop or failure.

Das Mittelstück (Pos: 7) des Nockenstücks stellt gleichzeitig den Innenring des Kreuzrollenlagers dar. Darüber liegt nun bevorzugt der Kreuzrollenverband. Eine andere Lageranordnung bzw. -form ist natürlich ebenfalls möglich. Über den Kreuzrollen liegen die Außenringe. Der Außenring kann als einteilige oder bevorzugt als zweiteilige Variante ausgeführt werden. Auch der Innenring kann ggf. auf das Nockenstück montiert werden.The middle piece (Pos: 7 ) of the cam piece simultaneously represents the inner ring of the cross roller bearing. It is now preferred the cross roller assembly. Of course, another bearing arrangement or form is also possible. Above the cross rollers lie the outer rings. The outer ring can be designed as a one-piece or preferably as a two-part variant. If necessary, the inner ring can also be mounted on the cam piece.

Im Motorlager des Zylinderkopfes (Pos: 1) ist beispielsweise eine Permaglidebuchse (Pos: 2) eingepresst. Von links wird nun der erste EAP-Aktor (Pos: 3) mit Hilfe einer Hülse (Pos: 4) eingeschoben. Nun wird das gesamte Nockenstück (Pos: 1) auf die Aktorhülse (Pos: 4) unter vorherigen Fügen in der Permaglidebuchse (Pos: 2) eingeschoben. Bei diesem Montagestand ist es hilfreich wenn der Aktor bereits so bestromt wird, daß er sich um ca. 50% zusammenzieht. Nun wird die zweite Hülse (Pos: 6) zusammen mit dem zweiten Aktorensatz (Pos: 5) eingeschoben. Ein Fixierdeckel hält das Aktorenpaket in der montierten Position. In the engine bearing of the cylinder head (Pos: 1 ) is, for example, a Permaglidebuchse (Pos: 2 ). From the left, the first EAP actuator (pos. 3 ) by means of a sleeve (Pos. 4 ) inserted. Now the entire cam piece (Pos. 1 ) on the actuator sleeve (Pos. 4 ) under previous joining in the permaglide bushing (Pos: 2 ) inserted. With this mounting stand it is helpful if the actuator is already energized so that it contracts by about 50%. Now the second sleeve (Pos. 6 ) together with the second set of actuators (pos. 5 ) inserted. A fixing cover holds the actuator package in the mounted position.

Der Aktor (Pos: 3) auf der rechten Seite ist bestromt mit einer Dehnung auf 50% dargestellt. Der linke Aktor (Pos: 5) ist mit einer Dehnung von 150% dargestellt. Somit werden rein rechnerisch mit der Bestromung ±50% Dehnung und Schrumpfung die Nocken vor- und rückwärts bewegt.The actuator (Pos: 3 ) on the right is energized with an elongation of 50%. The left actuator (Pos: 5 ) is shown with an elongation of 150%. Thus, mathematically, with the energization ± 50% elongation and shrinkage, the cams are moved back and forth.

Die Erfindung ermöglicht ein eigenes Koordinatensystem für das Nockenstück. Das Verschiebesystem ist durch die Gleitbuchse reibungsärmer in beide Richtungen. Die Aktorik ist durch die Verwendung von EAP-Aktoren vereinfacht. Die elektrische Ansteuerung der Aktorik ermöglicht eine Verschiebung unabhängig vom Ölfluß des Motors. Der Kreuzrollenverband ermöglicht eine Abwälzung der Rotativbewegung des Nockenstückes und somit eine wälzgelagerte Nockenwelle in der vorhandenen Zylinderkopflagerstelle ohne Änderung des Zylinderkopfes.The invention enables a separate coordinate system for the cam piece. The sliding system is less friction in both directions through the sliding bush. The actuators are simplified by the use of EAP actuators. The electrical control of the actuator allows a shift regardless of the oil flow of the engine. The cross roller assembly allows a circulation of the rotational movement of the cam piece and thus a roller bearing camshaft in the existing cylinder head bearing position without changing the cylinder head.

Die Dauerhaltbarkeit des Aktors kann durch dieses System verbessert werden.The durability of the actuator can be improved by this system.

Die Reibung in der Keilwelle wird durch die fehlende Durchbiegung reduziert. Dies wiederum bewirkt eine Verschleißreduktion des Gesamtsystems. Die Verwendung von EAP-Aktoren im Zusammenspiel mit dem fehlen von Steuernuten ermöglichen Variable Verschiebezeiten des Nockenstückes (unter Berücksichtigung der Kollisionsbetrachtung). Nicht zu vergessen die variablen Verschiebegeschwindigkeiten des Nockenstückes und die vollvariablen Verschiebepositionen für Nockenstücke im Hinblick auf weitere Entwicklungen bis hin zur Raumnocke.The friction in the spline is reduced by the lack of deflection. This in turn causes a reduction in the wear of the entire system. The use of EAP actuators in conjunction with the lack of control grooves allow variable displacement times of the cam piece (taking into account the collision consideration). Not to mention the variable displacement speeds of the cam piece and the fully variable displacement positions for cam pieces with regard to further developments up to the space cam.

Durch diese Lösung ist eine einfache Applikation eines Schiebenockensystems in bestehende Motore möglich und verbindet dies mit den Vorteilen einer wälzgelagerten Nockenwelle.This solution allows a simple application of a sliding cam system in existing engines and combines this with the advantages of a roller bearing camshaft.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Zylinderkopfcylinder head
22
Gleitbuchsebush
33
EAP-Aktor (li)EAP actuator (left)
44
Hülse (li)Sleeve (left)
55
EAP-Aktor (re)EAP actuator (right)
66
Hülse (re)Sleeve (right)
77
Schiebenockenstück mit Wälzlager (erfüllt direkt die Funktion des Lagerinnenrings)Slide cam piece with roller bearing (directly fulfills the function of the bearing inner ring)
88th
Keilwelle (statt herkömmlicher Nockenwelle)Splined shaft (instead of conventional camshaft)

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 the documents listed by the applicant has been generated automatically and is included solely 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 PatentliteraturCited patent literature

  • DE 10148177 A1 [0001] DE 10148177 A1 [0001]

Claims (2)

Schiebenockensystem einer Brennkraftmaschine, umfassend eine Keilwelle (8) und ein Nockenstück (7), das drehfest und axialverschiebbar auf der Keilwelle (8) gelagert ist, sowie einen Aktuator zur Verschiebung des Nockenstücks (7), dadurch gekennzeichnet, dass der Aktuator ein EAP-Aktuator (5, 6) ist, der ein sich bei Anlegen einer elektrischen Spannung dehnendes elektroaktives Polymer umfasst.Sliding cam system of an internal combustion engine, comprising a splined shaft ( 8th ) and a cam piece ( 7 ), the rotationally fixed and axially displaceable on the spline ( 8th ) is mounted, and an actuator for moving the cam piece ( 7 ), characterized in that the actuator is an EAP actuator ( 5 . 6 ), which comprises an electro-active polymer which expands when an electrical voltage is applied. Schiebenockensystem nach Anspruch 1, dadurch gekennzeichnet, dass das Nockenstück (7) in einem Kreuzrollenlager gelagert ist.Sliding cam system according to claim 1, characterized in that the cam piece ( 7 ) is mounted in a cross roller bearing.
DE201210217297 2012-09-25 2012-09-25 Sliding cam system for combustion engine, has left and right electroactive polymer actuators for displacing cam piece and comprising electroactive polymer that is stretched for creation of electric voltage Withdrawn DE102012217297A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE201210217297 DE102012217297A1 (en) 2012-09-25 2012-09-25 Sliding cam system for combustion engine, has left and right electroactive polymer actuators for displacing cam piece and comprising electroactive polymer that is stretched for creation of electric voltage

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Application Number Priority Date Filing Date Title
DE201210217297 DE102012217297A1 (en) 2012-09-25 2012-09-25 Sliding cam system for combustion engine, has left and right electroactive polymer actuators for displacing cam piece and comprising electroactive polymer that is stretched for creation of electric voltage

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014211432A1 (en) 2014-06-16 2015-12-17 Schaeffler Technologies AG & Co. KG linear actuator
DE102014211433A1 (en) 2014-06-16 2015-12-17 Schaeffler Technologies AG & Co. KG linear actuator
DE102014213438A1 (en) 2014-07-10 2016-01-14 Schaeffler Technologies AG & Co. KG linear actuator
WO2017121420A1 (en) * 2016-01-15 2017-07-20 Schaeffler Technologies AG & Co. KG Variable valve train
DE102017003790A1 (en) * 2017-04-20 2018-10-25 Daimler Ag Valve drive device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10148177A1 (en) 2001-09-28 2003-04-17 Ina Schaeffler Kg Valve drive with valve stroke reversal for gas exchange valves of 4-stroke IC engines has slide grooves extending across each other due to location at small relative distance, to reduce axial space requirement

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10148177A1 (en) 2001-09-28 2003-04-17 Ina Schaeffler Kg Valve drive with valve stroke reversal for gas exchange valves of 4-stroke IC engines has slide grooves extending across each other due to location at small relative distance, to reduce axial space requirement

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014211432A1 (en) 2014-06-16 2015-12-17 Schaeffler Technologies AG & Co. KG linear actuator
DE102014211433A1 (en) 2014-06-16 2015-12-17 Schaeffler Technologies AG & Co. KG linear actuator
DE102014213438A1 (en) 2014-07-10 2016-01-14 Schaeffler Technologies AG & Co. KG linear actuator
WO2017121420A1 (en) * 2016-01-15 2017-07-20 Schaeffler Technologies AG & Co. KG Variable valve train
DE102017003790A1 (en) * 2017-04-20 2018-10-25 Daimler Ag Valve drive device
CN110537006A (en) * 2017-04-20 2019-12-03 戴姆勒股份公司 Valve actuating mechanism
US10794233B2 (en) 2017-04-20 2020-10-06 Daimler Ag Valve drive device
CN110537006B (en) * 2017-04-20 2021-09-24 戴姆勒股份公司 Valve train

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