EP1509685B1 - Hydraulically actuated, variable valve gear of an internal combustion engine - Google Patents

Hydraulically actuated, variable valve gear of an internal combustion engine Download PDF

Info

Publication number
EP1509685B1
EP1509685B1 EP03737957A EP03737957A EP1509685B1 EP 1509685 B1 EP1509685 B1 EP 1509685B1 EP 03737957 A EP03737957 A EP 03737957A EP 03737957 A EP03737957 A EP 03737957A EP 1509685 B1 EP1509685 B1 EP 1509685B1
Authority
EP
European Patent Office
Prior art keywords
path
piston
valve drive
valve
pressure
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.)
Expired - Fee Related
Application number
EP03737957A
Other languages
German (de)
French (fr)
Other versions
EP1509685A1 (en
Inventor
Dieter Schmidt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
IHO Holding GmbH and Co KG
Original Assignee
Schaeffler KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Schaeffler KG filed Critical Schaeffler KG
Publication of EP1509685A1 publication Critical patent/EP1509685A1/en
Application granted granted Critical
Publication of EP1509685B1 publication Critical patent/EP1509685B1/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

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
    • F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
    • F01L9/10—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic
    • F01L9/11—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic in which the action of a cam is being transmitted to a valve by a liquid column
    • F01L9/12—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic in which the action of a cam is being transmitted to a valve by a liquid column with a liquid chamber between a piston actuated by a cam and a piston acting on a valve stem
    • 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
    • F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
    • F01L9/10—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic
    • F01L9/11—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic in which the action of a cam is being transmitted to a valve by a liquid column
    • F01L9/12—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic in which the action of a cam is being transmitted to a valve by a liquid column with a liquid chamber between a piston actuated by a cam and a piston acting on a valve stem
    • F01L9/14—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic in which the action of a cam is being transmitted to a valve by a liquid column with a liquid chamber between a piston actuated by a cam and a piston acting on a valve stem the volume of the chamber being variable, e.g. for varying the lift or the timing of a valve
    • 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
    • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
    • F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
    • F01L1/3442—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force
    • F01L2001/34423—Details relating to the hydraulic feeding circuit
    • F01L2001/34446—Fluid accumulators for the feeding circuit

Definitions

  • the invention relates to a hydraulically actuated, variable valve train of an internal combustion engine, with a contacted by a cam master piston, a force acting on a gas exchange valve slave piston, a position between the master and slave piston pressure chamber variable volume, which of a path to the supply and optional discharge of the hydraulic fluid is cut, which is acted upon by a switching means such as an electromagnet for influencing pressure to hydraulic means, wherein from the path branches off a secondary path to a pressure accumulator, which pressure accumulator has a flow-direction to the path acted upon by a spring means piston.
  • a switching means such as an electromagnet for influencing pressure to hydraulic means
  • Such a valve train is considered from the considered generic EP 0 803 642 out. Its accumulator is installed vertically in a support for the valve train on the internal combustion engine here. As is well known, In such valve trains to achieve partial or zero strokes during a stroke phase of the corresponding cam hydraulic fluid is discharged from the pressure chamber by an open electromagnetic switching means. An accumulator takes up most of this hydraulic fluid and gives it back to the pressure chamber at its enlargement.
  • the object of the invention is therefore to provide a valve train of the aforementioned type, in which the cited disadvantages are eliminated.
  • this object is achieved in that the path is connected to a hydraulic fluid reservoir, which consists of a pot-like element with a arranged on the path facing the bottom check valve, which opens towards the path and in the flow direction to one of a wall of the element included interior closing, wherein, starting from a path side of the element, radially between the wall and a guide for the element, a desired passage such as a leakage gap for supplying the hydraulic fluid is formed from the path for accumulation in the interior.
  • a hydraulic fluid reservoir which consists of a pot-like element with a arranged on the path facing the bottom check valve, which opens towards the path and in the flow direction to one of a wall of the element included interior closing, wherein, starting from a path side of the element, radially between the wall and a guide for the element, a desired passage such as a leakage gap for supplying the hydraulic fluid is formed from the path for accumulation in the interior.
  • valve train is included, in which at least one of the main claim members is multiple times present.
  • the skilled person designed the interior of the element so large that under all circumstances, a suction of air is prevented in the pressure chamber. It is proposed to make the storage volume at least 1.2 times as large as the volume that is displaced during a stroke movement of the master piston. Possibly. are also significantly larger volumes conceivable.
  • a compression spring for the spring means advantageously a coil spring o. ⁇ . Is applied, whereby further pressure-exerting means can be provided.
  • cup-shaped body for the guide can for example consist of a thin-walled, deep-drawn sheet metal material. Possibly. also a machining is conceivable. It is provided, on the one hand, to form the guide for the common component, as stated, from a separate component projecting beyond a carrier of the valve drive. However, it is equally conceivable and intended to form the guide by a receptacle of the carrier itself. This possibly reduces the component expenditure.
  • the check valve on an underside of the piston / bottom only consists of a ball which is held in ⁇ ffnet therapies by a Federkarppchen o. ⁇ .
  • no compression spring is proposed, which fixes the ball as a closing body at the passage of the piston or the bottom in pressure equality.
  • the closing body may be spring loaded.
  • valves such as plate valves, etc.
  • the ball valve is not spring-loaded, it is clear that at the lowest path-side negative pressure, the ball immediately releases a sufficient cross section at the passage and thus the necessary amount of hydraulic fluid can flow from the interior into the pressure chamber.
  • the unit must not be arranged parallel to the vertical. It is also conceivable oblique, flat or overhead installation of the aforementioned unit. Possibly. appropriate vent lines must be placed on the system to prevent unwanted accumulation of air in the storage tank.
  • FIG. 1 discloses a hydraulically actuated variable valve train 1 of an internal combustion engine. This has an acted upon by a cam 2 master piston 3, the downstream in the stroke direction of a pressure chamber 6 variable volume.
  • the pressure chamber 6 is cut by a path 7 for the supply and selective discharge of the hydraulic fluid.
  • a slave piston 5 is arranged, which acts directly on the gas exchange valve 4 in the lifting sense. With the path 7 communicates an unspecified to be explained, electromagnetic switching means 8, via the hydraulic fluid from the pressure chamber 6 can be derived.
  • FIG. 1 shows a secondary path 9 branches off from the path 7. This leads to a piston 12, which is acted upon in the flow direction to the path 7 by a spring means 11.
  • this pressure accumulator 10 as described in the introduction, the hydraulic fluid is added, which flows with open switching means 8 to achieve partial or zero stroke on the gas exchange valve 4 from the pressure chamber 6 and 3 is returned in upward movement of the master piston.
  • a hydraulic fluid accumulator 13 is assigned, which from the FIGS. 2, 3 closer.
  • the entire assembly is positioned as close as possible to the pressure chamber 6.
  • the out FIG. 1 apparent piston 12 of the accumulator 10 and the element 14 with the memory function are, like the FIGS. 2, 3 , positioned within a thin-walled guide 20 with a bottom 24 away from the path.
  • the component 10, 14 thus consists of a arranged at the bottom 15 check valve 16 with a closing body 30 designed as a ball, which in the direction of the path 7 by only a Federkalppchen 32 is held.
  • the closing body 30 is at overpressure on the path side 19 at a passage 33 of the bottom 15 and thus closes it.
  • a leakage gap formed passage 21 Radially between a wall 17 of the element 14 and the guide 20 is formed here as a leakage gap formed passage 21 for supplying hydraulic fluid from the path 7 via the secondary path 9 in the interior 18.
  • the guide 20 in the region of its bottom 24 has at least one outlet 34 for excess hydraulic fluid.
  • a stop 28 for an end face 29 of the piston 12 is provided in the region of the bottom 24. This is thus located on the side facing away from the path 7 22.
  • the component 10, 14 is a stop 27. This is designed as a circlip.
  • the guide 20 in the region of the path side 19 is partially received in a bore 25 of a carrier 26 of the valve train 1. It is also conceivable, however, in the carrier 26 completely or at least largely integrated solution.
  • FIG. 2 shows the component 10, 14 in its sunken state, as it is reached after switching off the internal combustion engine. It can be seen that the closing body 30 is open, since there is at least pressure equality between the path side and the inner space 18.
  • FIG. 3 discloses the component 10, 14 during the regular operation of the valve train 1 or immediately after the engine is switched off.
  • the space lying below the bottom 15 has received a quantity of hydraulic fluid, which has been displaced, for example, from the pressure chamber 6.
  • the closing body 30 of the check valve 16 is closed due to the high pressure in the aforementioned space.
  • a small amount of hydraulic fluid is always promoted via the formed as a leakage passage 21 into the interior 18.
  • Excess hydraulic fluid passes, as mentioned, via the outlet 34 into a reservoir or at least indirectly to the outside. At the same time 34 possibly existing air can be derived due to the geodesically elevated outlet.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)

Abstract

The invention relates to a hydraulically actuated, variable valve gear (1) of an internal combustion engine, comprising a master piston (3), which is in contact with a cam (2), a slave piston (5) that acts on a gas exchange valve (4) and a pressure chamber (6) of variable volume that is positioned between the master and the slave pistons (3, 5). The chamber is intersected by a path (7) for supplying and selectively draining hydraulic fluid, said path being subjected to the action of a switching element (8), such as an electromagnet for influencing the pressure of the hydraulic fluid. A secondary path (9) branches from the path (7) to a pressure accumulator (10), the latter (10) comprising a piston (12) in the direction of flow of the path (7) that is subjected to the action of a spring element (11). The invention is characterised in that the path (7) is connected to a hydraulic fluid reservoir (13), which consists of a pot-type element (14) comprising a non-return valve (16) on its base (15) that faces the path (7). Said valve opens in the direction of the path (7) and closes in the direction of flow to an inner chamber (18) that is surrounded by the wall (17) of the element (14). An intentional passage (21) in the form of a leakage gap is configured starting from one side of the path (19) of the element (14) and running radially between the wall (17) and a guide (20) for said element (14), said passage supplying the hydraulic fluid from the path (7) to the inner chamber (18), where it accumulates. This configuration permits the provision of a valve gear (1), which prevents the intake of air into the pressure chamber (6) of the valve gear, during the operation of the internal combustion engine.

Description

Gebiet der ErfindungField of the invention

Die Erfindung betrifft einen hydraulisch betätigten, variablen Ventiltrieb einer Brennkraftmaschine, mit einem von einem Nocken kontaktierten Geberkolben, einem auf ein Gaswechselventil einwirkenden Nehmerkolben, einer zwischen Geber- und Nehmerkolben positionierten Druckkammer änderbaren Volumens, welche von einem Pfad zur Zu- und wahlweisen Ableitung des Hydraulikmittels geschnitten ist, der von einem Schaltmittel wie einem Elektromagneten zur Beeinflussung Drucks an Hydraulikmittel beaufschlagt ist, wobei von dem Pfad ein Nebenpfad zu einem Druckspeicher abzweigt, welcher Druckspeicher einen in Fließrichtung zum Pfad durch ein Federmittel beaufschlagten Kolben besitzt.The invention relates to a hydraulically actuated, variable valve train of an internal combustion engine, with a contacted by a cam master piston, a force acting on a gas exchange valve slave piston, a position between the master and slave piston pressure chamber variable volume, which of a path to the supply and optional discharge of the hydraulic fluid is cut, which is acted upon by a switching means such as an electromagnet for influencing pressure to hydraulic means, wherein from the path branches off a secondary path to a pressure accumulator, which pressure accumulator has a flow-direction to the path acted upon by a spring means piston.

Hintergrund der ErfindungBackground of the invention

Ein derartiger Ventiltrieb geht aus der als gattungsbildend betrachteten EP 0 803 642 hervor. Dessen Druckspeicher ist hier senkrecht in einen Träger für den Ventiltrieb auf der Brennkraftmaschine eingebaut. Wie hinreichend bekannt, wird bei derartigen Ventiltrieben zur Erreichung von Teil- oder Nullhüben während einer Hubphase des entsprechenden Nockens Hydraulikmittel aus der Druckkammer durch ein geöffnetes elektromagnetisches Schaltmittel abgeleitet. Ein Druckspeicher nimmt dieses Hydraulikmittel größtenteils auf und gibt es der Druckkammer bei deren Vergrößerung wieder zurück.Such a valve train is considered from the considered generic EP 0 803 642 out. Its accumulator is installed vertically in a support for the valve train on the internal combustion engine here. As is well known, In such valve trains to achieve partial or zero strokes during a stroke phase of the corresponding cam hydraulic fluid is discharged from the pressure chamber by an open electromagnetic switching means. An accumulator takes up most of this hydraulic fluid and gives it back to the pressure chamber at its enlargement.

Insbesondere nachdem die Brennkraftmaschine abgestellt wurde ist bei Wiederbefeuerung festzustellen, dass der Kolben des Druckspeichers aufgrund der Kraft des diesen beaufschlagenden Federmittels und wegen der nicht zu vermeidenden Leckagen an Hydraulikmittel bis an seinen unteren Anschlag absinkt. Einige der Nocken der Brennkraftmaschine stehen dabei in Hubposition. Dies bedeutet, dass der Geberkolben relativ weit in die Druckkammer verfahren ist, wobei das entsprechende Gaswechselventil geschlossen bleibt. Bei einer ersten Umdrehung des entsprechenden Nockens folgt der anliegende Geberkolben diesem in den Grundkreis hinein. Hierdurch vergrößert sich das Volumen der Druckkammer und es besteht Gefahr, dass Luft bzw. Luft-Öl-Schaum in die Druckkammer angesaugt wird, da der Druckspeicher quasi leer ist und gleichzeitig eine Hydraulikmittelpumpe noch nicht bzw. in noch nicht ausreichender Quantität Hydraulikmittel fördert. Somit kann es zu einer massiven Funktionsstörung am Ventiltrieb kommen.In particular, after the internal combustion engine has been turned off, it should be noted when re-firing that the piston of the pressure accumulator due to the force of the spring means acting on it and because of the unavoidable leaks of hydraulic fluid drops to its lower stop. Some of the cams of the internal combustion engine are in the stroke position. This means that the master piston is moved relatively far into the pressure chamber, wherein the corresponding gas exchange valve remains closed. During a first revolution of the corresponding cam, the adjoining master piston follows it into the base circle. This increases the volume of the pressure chamber and there is a danger that air or air-oil foam is sucked into the pressure chamber, since the pressure accumulator is virtually empty and at the same time promotes a hydraulic fluid pump is not yet or in insufficient quantity of hydraulic fluid. This can lead to a massive malfunction of the valve train.

Aufgabe der ErfindungObject of the invention

Aufgabe der Erfindung ist es daher, einen Ventiltrieb der vorgenannten Art zu schaffen, bei welchem die zitierten Nachteile beseitigt sind.The object of the invention is therefore to provide a valve train of the aforementioned type, in which the cited disadvantages are eliminated.

Zusammenfassung der ErfindungSummary of the invention

Erfindungsgemäß wird diese Aufgabe dadurch gelöst, dass der Pfad mit einem Hydraulikmittelspeicher verbunden ist, der aus einem topfähnlichen Element mit einem an dessen dem Pfad zugewandten Boden angeordneten Rückschlagventil besteht, welches sich in Richtung zum Pfad öffnet und in Fließrichtung zu einem von einer Wand des Elements umfassten Innenraum schließt, wobei, ausgehend von einer Pfadseite des Elements, radial zwischen der Wand und einer Führung für das Element, ein gewollter Durchlaß wie ein Leckspalt zur Zuleitung des Hydraulikmittels vom Pfad zur Akkumulation in dem Innenraum gebildet ist.According to the invention, this object is achieved in that the path is connected to a hydraulic fluid reservoir, which consists of a pot-like element with a arranged on the path facing the bottom check valve, which opens towards the path and in the flow direction to one of a wall of the element included interior closing, wherein, starting from a path side of the element, radially between the wall and a guide for the element, a desired passage such as a leakage gap for supplying the hydraulic fluid is formed from the path for accumulation in the interior.

Somit sind die eingangs beschriebenen Nachteile mit einfachen Mitteln beseitigt, da ein auslaufsicherer Hydraulikmittelspeicher zur Verfügung steht, der, nachdem die Brennkraftmaschine abgestellt und wieder befeuert wurde, sofort eine ausreichende Quantität an Hydraulikmittel garantiert. Hierdurch ist die Druckkammer des Ventiltriebs von der ersten Nockenumdrehung an komplett mit Hydraulikmittel versorgt und es wird keine Luft angesaugt. Wie gesagt tritt dieses Problem im Stand der Technik insbesondere bei den Ventilen auf, deren Nocken und somit Geberkolben auf Hub stehen.Thus, the disadvantages described above are eliminated by simple means, since a leak-proof hydraulic fluid reservoir is available, which, after the engine has been turned off and re-fired, immediately guaranteed a sufficient quantity of hydraulic fluid. As a result, the pressure chamber of the valve train is supplied from the first cam revolution to complete with hydraulic fluid and it is sucked no air. As I said, this problem occurs in the prior art, especially in the valves whose cam and thus master piston are on hub.

Denkbar und vorgesehen ist es zwar, dass der Druck- und Hydraulikmitteispeicher separate Einheiten bilden. Insbesondere ist es jedoch vorgesehen, beide als eine Baueinheit auszubilden. Vorteilhafterweise wird diese Baueinheit so nah wie möglich an der Druckkammer positioniert.Although it is conceivable and intended that the pressure and Hydraulikmitteispeicher form separate units. In particular, however, it is intended to design both as a structural unit. Advantageously, this assembly is positioned as close as possible to the pressure chamber.

Selbstverständlich ist vom Schutzbereich der Erfindung auch ein Ventiltrieb eingeschlossen, bei welchem zumindest eines der im Hauptanspruch genannten Glieder mehrfach vorhanden ist.Of course, the scope of the invention, a valve train is included, in which at least one of the main claim members is multiple times present.

Anstelle des Leckspalts zur Zuleitung des Hydraulikmittels in den Innenraum des Elements erschließen sich dem Fachmann noch weitere Durchlässe wie Bypässe, Leitungen, Bohrungen, Kanäle etc.Instead of the leakage gap for supplying the hydraulic fluid into the interior of the element, the skilled person will be able to access further passages such as bypasses, lines, bores, channels, etc.

Selbstverständlich gestaltet der Fachmann den Innenraum des Elements so groß, dass unter allen Umständen ein Nachsaugen von Luft in die Druckkammer verhindert wird. Vorgeschlagen ist, das Speichervolumen mindestens 1,2-fach so groß wie das Volumen zu gestalten, das bei einer Hubbewegung des Geberkolbens verdrängt wird. Ggf. sind auch deutlich größere Volumina denkbar.Of course, the skilled person designed the interior of the element so large that under all circumstances, a suction of air is prevented in the pressure chamber. It is proposed to make the storage volume at least 1.2 times as large as the volume that is displaced during a stroke movement of the master piston. Possibly. are also significantly larger volumes conceivable.

Ebenfalls besonders vorteilhaft ist es, wenn der Kolben des Druckspeichers und das Element des Hydraulikmittelspeichers "hintereinander geschaltet" innerhalb einer Führung verlaufen. Als Führung ist somit das Gehäuse anzusehen, was im Stand der Technik lediglich den Kolben des Druckspeichers aufnimmt.It is also particularly advantageous if the piston of the pressure accumulator and the element of the hydraulic fluid store "run in series" run within a guide. As a guide is thus to look at the case, which absorbs only the piston of the pressure accumulator in the prior art.

Als Druckfeder für das Federmittel wird vorteilhafterweise eine Schraubenfeder o. ä. angewendet, wobei auch weitere druckausübende Mittel vorgesehen sein können.As a compression spring for the spring means advantageously a coil spring o. Ä. Is applied, whereby further pressure-exerting means can be provided.

Der in Fortbildung der Erfindung ausgeführte tassenförmige Körper für die Führung kann beispielsweise aus einem dünnwandigen, tiefgezogenen Blechwerkstoff bestehen. Ggf. ist auch eine spanende Bearbeitung denkbar. Vorgesehen ist es einerseits, die Führung für das gemeinsame Bauteil wie gesagt aus einem separaten und über einen Träger des Ventiltriebs hinausstehenden Bauteil auszubilden. Denkbar und vorgesehen ist es jedoch gleichermaßen, die Führung durch eine Aufnahme des Trägers selbst zu bilden. Dies verringert ggf. den Bauteileaufwand.The embodied in a further development of the invention cup-shaped body for the guide can for example consist of a thin-walled, deep-drawn sheet metal material. Possibly. also a machining is conceivable. It is provided, on the one hand, to form the guide for the common component, as stated, from a separate component projecting beyond a carrier of the valve drive. However, it is equally conceivable and intended to form the guide by a receptacle of the carrier itself. This possibly reduces the component expenditure.

Gemäß einer weiteren Fortbildung der Erfindung besteht das Rückschlagventil an einer Unterseite des Kolbens/Bodens lediglich aus einer Kugel, welche in Öffnetrichtung durch ein Federkäppchen o. ä. gehalten ist. Somit wird keine Druckfeder vorgeschlagen, welche die Kugel als Schließkörper am Durchlaß des Kolbens bzw. Bodens bei Druckgleichheit fixiert.According to a further development of the invention, the check valve on an underside of the piston / bottom only consists of a ball which is held in Öffnetrichtung by a Federkäppchen o. Ä. Thus, no compression spring is proposed, which fixes the ball as a closing body at the passage of the piston or the bottom in pressure equality.

Da es jedoch bei bestimmen konstruktiven Ausbildungen zum Auslaufen des Gesamtsystems bei Stillstand der Brennkraftmaschine kommen kann, kann es auch vorteilhaft sein, bei Druckgleichheit den Innenraum des Elements an einem Auslaufen zu hindern. Somit kann auch der Schließkörper federbelastet sein.However, since it can come to a standstill of the internal combustion engine in certain constructive training for leakage of the entire system, it may also be advantageous to prevent the pressure on the interior of the element at a leakage. Thus, the closing body may be spring loaded.

Anstelle des Kugelventils können auch andere Ventilarten wie Plattenventile etc. Verwendung finden. Sofern das Kugelventil nicht federbelastet wird, ist klar, dass beim geringsten pfadseitigen Unterdruck die Kugel sofort einen ausreichenden Querschnitt am Durchlaß freigibt und somit die notwendige Menge an Hydraulikmittel aus dem Innenraum in die Druckkammer fließen kann.Instead of the ball valve, other types of valves such as plate valves, etc. can be used. If the ball valve is not spring-loaded, it is clear that at the lowest path-side negative pressure, the ball immediately releases a sufficient cross section at the passage and thus the necessary amount of hydraulic fluid can flow from the interior into the pressure chamber.

Bei Verwendung des Federmittels für den Schließkörper ist es vorgesehen, dass dieser bei einem pfadseitigen Unterdruck von etwa 0,01 bis 0,5 bar öffnet. Somit ist zwar einerseits das vorgenannte Auslaufen verhindert aber andererseits ein ausreichend schnelles Öffnen garantiert.When using the spring means for the closing body, it is provided that this opens at a path-side negative pressure of about 0.01 to 0.5 bar. Thus, on the one hand prevents the aforementioned leakage but on the other hand guarantees a sufficiently fast opening.

Selbstverständlich muss die Baueinheit nicht parallel zur Lotrechten angeordnet sein. Denkbar ist auch ein Schräg-, Flach- oder Überkopfeinbau der vorgenannten Einheit. Ggf. müssen geeignete Entlüftungsleitungen am System angeordnet werden, um ein unerwünschtes Anhäufen von Luft im Speicher zu verhindern.Of course, the unit must not be arranged parallel to the vertical. It is also conceivable oblique, flat or overhead installation of the aforementioned unit. Possibly. appropriate vent lines must be placed on the system to prevent unwanted accumulation of air in the storage tank.

Aufgrund des Austritts für Hydraulikmittel im Boden der Führung wird garantiert, dass im befüllten Zustand des Innenraums überschüssiges Hydraulikmittel, welches ständig aufgrund der Förderung der Hydraulikmittelpumpe und der dem System immanenten Leckagen anfällt, abgeführt wird.Due to the discharge of hydraulic fluid in the bottom of the guide is guaranteed that in the filled state of the interior excess hydraulic fluid, which constantly accumulates due to the promotion of the hydraulic fluid pump and the system inherent leaks, is dissipated.

Kurze Beschreibung der ZeichnungShort description of the drawing

Die Erfindung ist zweckmäßigerweise anhand der Zeichnung näher erläutert. Es zeigen:

Figur 1
eine schematische Ansicht des variablen Ventiltriebs und
Figuren 2, 3
den Druckspeicher, welcher erfindungsgemäß aus einer Baueinheit mit dem Hydraulikmittelspeicher hergestellt ist.
The invention is suitably explained in more detail with reference to the drawing. Show it:
FIG. 1
a schematic view of the variable valve train and
FIGS. 2, 3
the pressure accumulator, which is produced according to the invention from a structural unit with the hydraulic fluid reservoir.

Ausführliche Beschreibung der ZeichnungDetailed description of the drawing

Figur 1 offenbart einen hydraulisch betätigten, variablen Ventiltrieb 1 einer Brennkraftmaschine. Dieser hat einen von einem Nocken 2 beaufschlagter Geberkolben 3, dem in Hubrichtung eine Druckkammer 6 änderbaren Volumens nachgeordnet ist. Die Druckkammer 6 ist von einem Pfad 7 zur Zu- und wahlweisen Ableitung des Hydraulikmittels geschnitten. Auf der Ventilseite ist ein Nehmerkolben 5 angeordnet, der unmittelbar auf das Gaswechselventil 4 im Hubsinn einwirkt. Mit dem Pfad 7 kommuniziert ein nicht näher zu erläuterndes, elektromagnetisches Schaltmittel 8, über das Hydraulikmittel aus der Druckkammer 6 abgeleitet werden kann. FIG. 1 discloses a hydraulically actuated variable valve train 1 of an internal combustion engine. This has an acted upon by a cam 2 master piston 3, the downstream in the stroke direction of a pressure chamber 6 variable volume. The pressure chamber 6 is cut by a path 7 for the supply and selective discharge of the hydraulic fluid. On the valve side, a slave piston 5 is arranged, which acts directly on the gas exchange valve 4 in the lifting sense. With the path 7 communicates an unspecified to be explained, electromagnetic switching means 8, via the hydraulic fluid from the pressure chamber 6 can be derived.

Des weiteren zeigt Figur 1, dass von dem Pfad 7 ein Nebenpfad 9 abzweigt. Dieser führt zu einem Kolben 12, welcher in Fließrichtung zum Pfad 7 durch ein Federmittel 11 beaufschlagt ist. In diesem Druckspeicher 10 wird, wie beschreibungseinleitend schon dargelegt, das Hydraulikmittel aufgenommen, welches bei geöffnetem Schaltmittel 8 zur Erzielung von Teil- oder Nullhub am Gaswechselventil 4 aus der Druckkammer 6 strömt und bei Aufwärtsbewegung des Geberkolbens 3 wieder zurückgegeben wird.Further shows FIG. 1 in that a secondary path 9 branches off from the path 7. This leads to a piston 12, which is acted upon in the flow direction to the path 7 by a spring means 11. In this pressure accumulator 10, as described in the introduction, the hydraulic fluid is added, which flows with open switching means 8 to achieve partial or zero stroke on the gas exchange valve 4 from the pressure chamber 6 and 3 is returned in upward movement of the master piston.

Der am rechten unteren Bildrand der Figur 1 ersichtliche Pfeil steht für eine Zuleitung an Hydraulikmittel, ausgehend von einer Hydraulikmittelpumpe.The at the lower right edge of the picture FIG. 1 apparent arrow stands for a supply of hydraulic fluid, starting from a hydraulic fluid pump.

Erfindungsgemäß ist dem Pfad 7 ein Hydraulikmittelspeicher 13 zugeordnet, welcher aus den Figuren 2, 3 näher hervorgeht. Dieser bildet mit dem Druckspeicher 10 eine Baueinheit und ist über lediglich den einen Nebenpfad 9 versorgt. Vorteilhafterweise ist die gesamte Baueinheit so nah wie möglich an der Druckkammer 6 positioniert. Der aus Figur 1 ersichtliche Kolben 12 des Druckspeichers 10 und das Element 14 mit der Speicherfunktion sind, wie die Figuren 2, 3 zeigen, innerhalb einer dünnwandigen Führung 20 mit einem pfadfernen Boden 24 positioniert. Das Bauteil 10, 14 besteht somit aus einem am Boden 15 angeordneten Rückschlagventil 16 mit einem als Kugel ausgebildeten Schließkörper 30, welcher in Richtung zum Pfad 7 durch lediglich ein Federkäppchen 32 gehalten ist. Dabei liegt der Schließkörper 30 bei Überdruck an der Pfadseite 19 an einem Durchlaß 33 des Bodens 15 an und verschließt diesen somit.According to the path 7, a hydraulic fluid accumulator 13 is assigned, which from the FIGS. 2, 3 closer. This forms with the pressure accumulator 10 a unit and is powered by only one side path 9. Advantageously, the entire assembly is positioned as close as possible to the pressure chamber 6. The out FIG. 1 apparent piston 12 of the accumulator 10 and the element 14 with the memory function are, like the FIGS. 2, 3 , positioned within a thin-walled guide 20 with a bottom 24 away from the path. The component 10, 14 thus consists of a arranged at the bottom 15 check valve 16 with a closing body 30 designed as a ball, which in the direction of the path 7 by only a Federkäppchen 32 is held. In this case, the closing body 30 is at overpressure on the path side 19 at a passage 33 of the bottom 15 and thus closes it.

Radial zwischen einer Wand 17 des Elements 14 und der Führung 20 ist ein hier als Leckspalt ausgebildeter Durchlaß 21 zur Zuleitung von Hydraulikmittel vom Pfad 7 über den Nebenpfad 9 in den Innenraum 18 gebildet. Gleichzeitig hat die Führung 20 im Bereich ihres Bodens 24 wenigstens einen Austritt 34 für überschüssiges Hydraulikmittel.Radially between a wall 17 of the element 14 and the guide 20 is formed here as a leakage gap formed passage 21 for supplying hydraulic fluid from the path 7 via the secondary path 9 in the interior 18. At the same time, the guide 20 in the region of its bottom 24 has at least one outlet 34 for excess hydraulic fluid.

Des weiteren ist im Bereich des Bodens 24 ein Anschlag 28 für eine Stirnseite 29 des Kolbens 12 geschaffen. Dieser liegt somit an der dem Pfad 7 abgewandten Seite 22. An der Pfadseite 19 hingegen findet das Bauteil 10, 14 einen Anschlag 27. Dieser ist hier als Sicherungsring ausgebildet.Furthermore, a stop 28 for an end face 29 of the piston 12 is provided in the region of the bottom 24. This is thus located on the side facing away from the path 7 22. On the path side 19, however, the component 10, 14 is a stop 27. This is designed as a circlip.

Wie der Fachmann sich den Figuren 2, 3 entnehmen kann, ist die Führung 20 im Bereich der Pfadseite 19 abschnittsweise in einer Bohrung 25 eines Trägers 26 des Ventiltriebs 1 aufgenommen. Denkbar ist jedoch auch eine in den Träger 26 vollkommen oder zumindest größtenteils integrierte Lösung.How the specialist looks at the FIGS. 2, 3 can be taken, the guide 20 in the region of the path side 19 is partially received in a bore 25 of a carrier 26 of the valve train 1. It is also conceivable, however, in the carrier 26 completely or at least largely integrated solution.

Im Inneren des Bauteils 10, 14 verläuft die Druckfeder 11. Diese stützt sich pfadseitig am Boden 15 ab und wirkt an der dem Pfad 7 abgewandten Seite 22 gegen eine Abstützung 23. Figur 2 zeigt das Bauteil 10, 14 in seinem abgesunkenen Zustand, so wie er nach dem Abstellen der Brennkraftmaschine erreicht wird. Zu erkennen ist, dass der Schließkörper 30 geöffnet ist, da zumindest Druckgleichheit zwischen der Pfadseite und dem Innenraum 18 herrscht.In the interior of the component 10, 14, the compression spring 11 extends. This is supported on the path 15 on the ground and acts on the side facing away from the path 7 22 against a support 23rd FIG. 2 shows the component 10, 14 in its sunken state, as it is reached after switching off the internal combustion engine. It can be seen that the closing body 30 is open, since there is at least pressure equality between the path side and the inner space 18.

Figur 3 offenbart das Bauteil 10, 14 während des regulären Betriebs des Ventiltriebs 1 bzw. unmittelbar nach dem Abstellen der Brennkraftmaschine. Dabei hat der unterhalb vom Boden 15 liegende Raum eine Hydraulikmittelmenge aufgenommen, welche beispielsweise aus der Druckkammer 6 verdrängt wurde. Der Schließkörper 30 des Rückschlagventils 16 ist aufgrund des Hochdrucks in dem vorgenannten Raum geschlossen. Eine geringfügige Hydraulikmittelmenge wird dabei stets über den als Leckspalt ausgebildeten Durchlaß 21 in den Innenraum 18 gefördert. Überschüssiges Hydraulikmittel gelangt, wie genannt, über den Austritt 34 in ein Reservoir bzw. zumindest mittelbar ins Freie. Gleichzeitig kann aufgrund des geodätisch hochliegenden Austritts 34 ggf. vorhandene Luft abgeleitet werden. FIG. 3 discloses the component 10, 14 during the regular operation of the valve train 1 or immediately after the engine is switched off. In this case, the space lying below the bottom 15 has received a quantity of hydraulic fluid, which has been displaced, for example, from the pressure chamber 6. The closing body 30 of the check valve 16 is closed due to the high pressure in the aforementioned space. A small amount of hydraulic fluid is always promoted via the formed as a leakage passage 21 into the interior 18. Excess hydraulic fluid passes, as mentioned, via the outlet 34 into a reservoir or at least indirectly to the outside. At the same time 34 possibly existing air can be derived due to the geodesically elevated outlet.

Ist die Brennkraftmaschine abgestellt und der in Figur 1 gezeigte Nocken 2 steht auf Hub, wobei dann der Geberkolben 3 axial weitestgehend in die Druckkammer 6 ragt, ist das ursprünglich aus der Druckkammer 6 in den Druckspeicher 10 geleitete Hydraulikmittel nach und nach durch Leckagen und über die Kraft des Federmittels 11 verdrängt. Somit steht normalerweise, wie schon mehrfach genannt, diese Hydraulikmittelmenge nicht mehr bei einer Wiederbefeuerung der Brennkraftmaschine zum sofortigen Befüllen der Druckkammer 6 bei der nach oben gerichteten Bewegung des Geberkolbens 3 zur Verfügung. Da jedoch die notwendige Hydraulikmittelmenge im Innenraum 18 akkumuliert wurde, wird diese sofort mit der beginnenden Aufwärtsbewegung des Geberkolbens 3 über das ausreichend geöffnete Rückschlagventil 16, den Nebenpfad 9 und den Pfad 7 in die Druckkammer 6 geleitet. Somit ist mit diesen einfachen Mitteln wirkungsvoll ein Ansaugen von Luft in die Druckkammer 6 nach Inbetriebnahme der Brennkraftmaschine verhindert. Der Ventiltrieb und somit die Brennkraftmaschine läuft von Anfang an störungsfrei.Is the engine stopped and the in FIG. 1 shown cam 2 is at hub, in which case the master piston 3 protrudes axially into the pressure chamber 6 as far as possible, the originally out of the pressure chamber 6 into the accumulator 10 directed hydraulic fluid is gradually displaced by leaks and the force of the spring means 11. Thus, normally, as already mentioned several times, this amount of hydraulic fluid is no longer at a re-firing of the internal combustion engine for immediate filling of the pressure chamber 6 in the upward movement of the master piston 3 available. However, since the necessary amount of hydraulic fluid was accumulated in the interior 18, it is immediately with the incipient upward movement of the master piston 3 via the sufficiently open check valve 16, the secondary path 9 and the path 7 into the pressure chamber 6 passed. Thus, with these simple means effectively sucking air into the pressure chamber 6 after starting the internal combustion engine is prevented. The valve train and thus the internal combustion engine runs smoothly from the beginning.

Liste der BezugszahlenList of reference numbers

11
Ventiltriebvalve train
22
Nockencam
33
Geberkolbenmaster piston
44
GaswechselventilGas exchange valve
55
Nehmerkolbenslave piston
66
Druckkammerpressure chamber
77
Pfadpath
88th
Schaltmittelswitching means
99
NebenpfadIn addition to path
1010
Druckspeicheraccumulator
1111
Federmittelspring means
1212
Kolbenpiston
1313
HydraulikmittelspeicherHydraulic fluid accumulator
1414
Elementelement
1515
Bodenground
1616
Rückschlagventilcheck valve
1717
Wandwall
1818
Innenrauminner space
1919
Pfadseitepage path
2020
Führungguide
2121
DurchlaßPassage
2222
Seitepage
2323
Abstützungsupport
2424
Bodenground
2525
Bohrungdrilling
2626
Trägercarrier
2727
Anschlagattack
2828
Anschlagattack
2929
Stirnseitefront
3030
Schließkörperclosing body
3131
Unterseitebottom
3232
Federkäppchenspring caps
3333
DurchlaßPassage
3434
Austrittexit

Claims (11)

  1. Hydraulically actuated variable valve drive (1) of an internal combustion engine, having a master piston (3) which is contacted by a cam (2), having a slave piston (5) which acts on a gas exchange valve (4), having a variable-volume pressure chamber (6) positioned between the master and slave pistons (3, 5), which pressure chamber (6) is intersected by a path (7) for the supply and selective discharge of the hydraulic medium, which path (7) is acted on by a switching means (8) such as an electromagnet for influencing pressure of hydraulic medium, with an auxiliary path (9) branching off from the path (7) to a pressure accumulator (10), which pressure accumulator (10) has a piston (12) which is acted on by a spring means (11) in the flow direction to the path (7), characterized in that the path (7) is connected to a hydraulic medium accumulator (13) which is composed of a pot-shaped element (14) with a non-return valve (16) arranged on its base (15) which faces towards the path (7), which non-return valve (16) opens in the direction of the path (7) and closes in the flow direction to an interior space (18) which is enclosed by a wall (17) of the element (14), with an intended passage (21) such as a leakage gap for conducting the hydraulic medium from the path (7) for accumulation in the interior space (18) being formed, proceeding from a path side (19) of the element (14), radially between the wall (17) and a guide (20) for the element (14).
  2. Valve drive according to Claim 1, characterized in that the pressure and hydraulic medium accumulators (10, 13) form a modular unit with only one auxiliary path (9).
  3. Valve drive according to Claim 1, characterized in that the piston (12) of the pressure accumulator (10) and the element (14) of the hydraulic medium accumulator (13) are formed by one component, with the spring means (11), which is embodied as at least one pressure spring, running in the interior spare (18) of the component (10, 14), which spring means (11) acts at the path side against the piston (12) / base (15) and, at a side (22) facing away from the path (7), bears against a support (23).
  4. Valve drive according to Claim 3, characterized in that the guide (20) for the component (12, 14) is composed of a cup-shaped body whose base (24) is positioned on the side (22) facing away from the path (7), with the guide (20), at the path side, being installed at least in sections in a bore (25) of a support (26) for the valve drive (1) on the internal combustion engine.
  5. Valve drive according to Claim 4, characterized in that the guide (20) has, on its path side (19), a stop (27) such as a locking ring as a travel limitation for the component (12, 14), with a further stop (28) for an end side (29) of the component (12, 14) selectively being formed on the side (22) facing away from the path (7), which further stop (28) runs in the region of the base (24) of the guide (20).
  6. Valve drive according to Claim 3, characterized in that a direct guide (20) for the component (12, 14) is formed by a bore which is arranged at least predominantly in a support (26) for the valve drive (1).
  7. Valve drive according to Claim 3, characterized in that a closing body (30) of the non-return valve (16) is arranged at an underside (31) of the piston (12) / base (15) and is fixed merely by means of a spring cap (32) in front of a passage (33) to the interior space (18).
  8. Valve drive according to Claim 3, characterized in that a closing body (30) of the non-return valve (16) is arranged at an underside (31) of the piston (12) / base (15) and is pressed by means of a pressure spring against a passage (33) to the interior space (18).
  9. Valve drive according to Claim 8, characterized in that the non-return valve (16) opens in the event of a path-side vacuum of 0.01 - 0.5 bar.
  10. Valve drive according to Claim 4, characterized in that the base (24) of the guide (20) has at least one outlet (34) for hydraulic medium.
  11. Valve drive according to Claim 3, characterized in that a volume of hydraulic medium can be enclosed in the interior space (18), which volume corresponds at least to 1.2 times the volume displaced during a stroke movement of the master piston (3).
EP03737957A 2002-05-31 2003-04-25 Hydraulically actuated, variable valve gear of an internal combustion engine Expired - Fee Related EP1509685B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10224038A DE10224038A1 (en) 2002-05-31 2002-05-31 Hydraulically operated, variable valve train of an internal combustion engine
DE10224038 2002-05-31
PCT/EP2003/004294 WO2003102383A1 (en) 2002-05-31 2003-04-25 Hydraulically actuated, variable valve gear of an internal combustion engine

Publications (2)

Publication Number Publication Date
EP1509685A1 EP1509685A1 (en) 2005-03-02
EP1509685B1 true EP1509685B1 (en) 2008-03-05

Family

ID=29432457

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03737957A Expired - Fee Related EP1509685B1 (en) 2002-05-31 2003-04-25 Hydraulically actuated, variable valve gear of an internal combustion engine

Country Status (4)

Country Link
EP (1) EP1509685B1 (en)
AU (1) AU2003245877A1 (en)
DE (2) DE10224038A1 (en)
WO (1) WO2003102383A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2511489B1 (en) * 2011-04-14 2013-05-29 C.R.F. Società Consortile per Azioni Internal combustion engine with hydro-mechanic valve actuation system for the intake valve and its solenoid control valve
RU2642946C2 (en) * 2013-07-15 2018-01-29 Шаньдун Юниверсити Oil regulator in all-mode valve manifold system of internal combustion engine
DE102016009056A1 (en) 2016-07-26 2018-02-01 Daimler Ag Valve train device for an internal combustion engine and internal combustion engine
GB2562268A (en) * 2017-05-10 2018-11-14 Jaguar Land Rover Ltd Apparatus for moving at least one valve for a combustion chamber of an internal combustion engine

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH086571B2 (en) * 1989-09-08 1996-01-24 本田技研工業株式会社 Valve train for internal combustion engine
DE3939002A1 (en) * 1989-11-25 1991-05-29 Bosch Gmbh Robert HYDRAULIC VALVE CONTROL DEVICE FOR A MULTI-CYLINDER INTERNAL COMBUSTION ENGINE
DE4206696C2 (en) * 1992-03-04 2000-12-14 Bosch Gmbh Robert Hydraulic valve control device for engine valves
IT1285853B1 (en) 1996-04-24 1998-06-24 Fiat Ricerche INTERNAL COMBUSTION ENGINE WITH VARIABLE OPERATION VALVES.
IT1291490B1 (en) * 1997-02-04 1999-01-11 C R F Societa Consotile Per Az DIESEL CYCLE MULTI-CYLINDER ENGINE WITH VARIABLE ACTING VALVES
DE10101584A1 (en) * 2001-01-16 2002-07-25 Bosch Gmbh Robert Pressure accumulator for pressurizing a hydraulic device, with which a gas exchange valve of an internal combustion engine is preferably actuated
ITTO20010269A1 (en) * 2001-03-23 2002-09-23 Fiat Ricerche INTERNAL COMBUSTION ENGINE, WITH HYDRAULIC VARIABLE VALVE OPERATION SYSTEM, AND MEANS OF COMPENSATION OF VOLUME VARIATIONS

Also Published As

Publication number Publication date
DE10224038A1 (en) 2003-12-11
WO2003102383A1 (en) 2003-12-11
AU2003245877A1 (en) 2003-12-19
EP1509685A1 (en) 2005-03-02
DE50309325D1 (en) 2008-04-17

Similar Documents

Publication Publication Date Title
EP2060754B1 (en) Hydraulic unit for a cylinder head for a combustion engine with a variable valve stroke
EP0734494B2 (en) Reciprocating pump for pumping hydraulic fluid
DE4401074B4 (en) Pump arrangement, in particular for conveying fuel from a reservoir to an internal combustion engine
EP2294316B1 (en) Piston pump of a hydraulic vehicle brake system
CH642429A5 (en) HYDRAULIC DEVICE FOR ACTUATING GAS EXCHANGE VALVES.
DE102009052531A1 (en) machine press
DE102009026273A1 (en) Hydraulic pressing device
DE102008059212A1 (en) Spanner for an endless transmission line
EP0576415A1 (en) Suction control valve
EP1461533B1 (en) Pump
DD145121A1 (en) INTERNAL COMBUSTION ENGINE WITH ENGINE BRAKE
DE102009045113A1 (en) Pressure limiting device e.g. pressure limiting valve, for use in reciprocating piston pump utilized for diesel fuel injection system of internal combustion engine, has pressure spring arranged between cam shaft and reciprocating piston
EP2128443A1 (en) Pump element
EP0283026A2 (en) Method and device for starting an hydraulic membrane pump against a load
EP1509685B1 (en) Hydraulically actuated, variable valve gear of an internal combustion engine
DE102011051487A1 (en) Electrohydraulic valve control
DE102011089399A1 (en) Pump, in particular high-pressure fuel pump for a fuel injection device
DE10016895B4 (en) Hydraulic block with at least one pump
DE102016204329B4 (en) Hydraulic valve train for an internal combustion engine
EP1247983B1 (en) Piston pump for hydraulic systems
DE69102047T2 (en) Liquid pump.
DE102007038530A1 (en) High-pressure fuel pump for fuel injection system of internal combustion engine, has spring collar whose surface is pressurized with closing pressure, by which valves are closed, before fuel is pressurized with high-pressure by piston
DE3625664C2 (en)
DE102004024471B3 (en) Pump for the removal of liquid or pasty mass, appropriate dispensing apparatus and corresponding method
DE102013221268A1 (en) Check valve unit in active accumulator

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20041104

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL LT LV MK

DAX Request for extension of the european patent (deleted)
RBV Designated contracting states (corrected)

Designated state(s): DE FR GB IT SE

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: SCHAEFFLER KG

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB IT SE

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REF Corresponds to:

Ref document number: 50309325

Country of ref document: DE

Date of ref document: 20080417

Kind code of ref document: P

REG Reference to a national code

Ref country code: SE

Ref legal event code: TRGR

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20080312

Year of fee payment: 6

ET Fr: translation filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 20080408

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20080430

Year of fee payment: 6

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20081208

EUG Se: european patent has lapsed
GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20090425

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20091231

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20091222

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20090425

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20090426

REG Reference to a national code

Ref country code: DE

Ref legal event code: R081

Ref document number: 50309325

Country of ref document: DE

Owner name: SCHAEFFLER TECHNOLOGIES AG & CO. KG, DE

Free format text: FORMER OWNER: SCHAEFFLER TECHNOLOGIES GMBH & CO. KG, 91074 HERZOGENAURACH, DE

Effective date: 20120828

Ref country code: DE

Ref legal event code: R081

Ref document number: 50309325

Country of ref document: DE

Owner name: SCHAEFFLER TECHNOLOGIES GMBH & CO. KG, DE

Free format text: FORMER OWNER: SCHAEFFLER TECHNOLOGIES GMBH & CO. KG, 91074 HERZOGENAURACH, DE

Effective date: 20120828

REG Reference to a national code

Ref country code: DE

Ref legal event code: R081

Ref document number: 50309325

Country of ref document: DE

Owner name: SCHAEFFLER TECHNOLOGIES GMBH & CO. KG, DE

Free format text: FORMER OWNER: SCHAEFFLER TECHNOLOGIES AG & CO. KG, 91074 HERZOGENAURACH, DE

Effective date: 20140213

Ref country code: DE

Ref legal event code: R081

Ref document number: 50309325

Country of ref document: DE

Owner name: SCHAEFFLER TECHNOLOGIES AG & CO. KG, DE

Free format text: FORMER OWNER: SCHAEFFLER TECHNOLOGIES AG & CO. KG, 91074 HERZOGENAURACH, DE

Effective date: 20140213

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20140424

Year of fee payment: 12

Ref country code: DE

Payment date: 20140627

Year of fee payment: 12

REG Reference to a national code

Ref country code: DE

Ref legal event code: R081

Ref document number: 50309325

Country of ref document: DE

Owner name: SCHAEFFLER TECHNOLOGIES AG & CO. KG, DE

Free format text: FORMER OWNER: SCHAEFFLER TECHNOLOGIES GMBH & CO. KG, 91074 HERZOGENAURACH, DE

Effective date: 20150127

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 50309325

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20150425

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20151103

P01 Opt-out of the competence of the unified patent court (upc) registered

Effective date: 20230522