EP1234957A2 - Valve drive in an internal combustion engine - Google Patents

Valve drive in an internal combustion engine Download PDF

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Publication number
EP1234957A2
EP1234957A2 EP02002529A EP02002529A EP1234957A2 EP 1234957 A2 EP1234957 A2 EP 1234957A2 EP 02002529 A EP02002529 A EP 02002529A EP 02002529 A EP02002529 A EP 02002529A EP 1234957 A2 EP1234957 A2 EP 1234957A2
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EP
European Patent Office
Prior art keywords
valve
holding part
cam
compensation device
play compensation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP02002529A
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German (de)
French (fr)
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EP1234957B1 (en
EP1234957A3 (en
Inventor
Stephan Laiminger
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Innio Jenbacher GmbH and Co OG
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Jenbacher AG
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Publication date
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Priority to AT02002529T priority Critical patent/ATE263309T1/en
Publication of EP1234957A2 publication Critical patent/EP1234957A2/en
Publication of EP1234957A3 publication Critical patent/EP1234957A3/en
Application granted granted Critical
Publication of EP1234957B1 publication Critical patent/EP1234957B1/en
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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
    • 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
    • F01L1/08—Shape of cams
    • 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 valve train for an internal combustion engine, with a driven Cam element and with one of the cam area of the rotating Cam element against a closing spring openable valve, which is a hydraulic Backlash compensation device with a supply line provided with a check valve and a derivative for a pressure transmission medium, the derivative by means of a spring-loaded locking element over the cam area of the Cam element is closed and open over the base circle area.
  • Mechanical valve trains with hydraulic lash adjusters are in large number and known in different versions. They serve the valve to adjust in the valve seat so that it over the base circle area of the cam element is actually closed properly.
  • the adjustment results from the level of the pressure transmission medium, in particular oil, in the pressure chamber caused by Change in the inflow can be set.
  • the derivative shows an increased Flow resistance, for example due to a small cross section, a throttle element or the like, in order to avoid rapid drainage. Because such Valve clearance compensation has the disadvantage that the medium from the pressure chamber too during the opening of the valve, i.e. during the application by the The cam area of the cam element exits via the derivative was described in DE 41 24 184 A proposed a valve train of the type mentioned, the tappet includes.
  • a sliding inner sleeve is arranged in the cup, and in the space between the cup and the inner sleeve engages in the cylinder head an adjustable intermediate sleeve, with passage openings in the sleeves are opened or closed depending on the position of the cam element. On this is the exit of the pressure transmission medium during the valve opening prevented, and the game compensation element can not be compressed. The Through openings are only cleared again at the transition to the base circle area, so that the valve clearance is established.
  • the invention has now set itself the task of switching the locking element to simplify, and suggests that the base circle area of the cam member is provided with a space into which the locking element or one assigned to it Holding part can occur.
  • the free space opens from the transition from the cam area to the base circle area of the cam element and the locking element can under the action of a spring be moved so that the derivation of the pressure transmission element is released becomes.
  • the locking element can be in the pressure chamber of the hydraulic accumulator compensation device be arranged, it being displaceable in the valve axis lie and with a second end directly in the free space of the cam element can intervene.
  • the blocking element is preferably laterally next to the Match compensation device arranged on the holding part, wherein the holding part Compression spring is assigned, which holds the holding part in the recess of the cam element suppressed.
  • the holding part of the locking element is preferably displaceable on the play compensation device arranged, and the pressure spring between the game compensation device and the holding part provided.
  • the holding part the game compensation device protrudes axially on both sides and limit stops for the displacement the game compensation device.
  • the force of the compression spring is preferably essential less than that of the valve closing spring.
  • a valve train for an intake or exhaust valve 13 of an internal combustion engine has one driven camshaft on which at least one cam element 1 is arranged, that opens the valve 13 against a valve spring 14.
  • the cam element 1 has one Cam area and a base circle area in which one with respect to the Base circle 3 deepened space 2 is provided.
  • a hydraulic lash adjuster provided between the cam element 1 and the valve 13 a piston 10 acting on the tappet of the valve 13, a cup-like Actuating cylinder 18, in which the piston 10 slidably engages, and a pressure chamber 14 between the piston 10 and the bottom of the actuating cylinder 18 comprises.
  • the pressure room 14 is via a feed line 17 and a check valve 16 with a Pressure transmission medium, in particular oil, can be filled and via a discharge line 6 can be emptied, in which a check valve 9 and a throttle element 7 in a row are arranged.
  • a holding part 19 is slidably arranged on the actuating cylinder 18, which projects axially on both sides via the actuating cylinder 18 and into the displacement path of the Actuating cylinder 18 has protruding limit stops 5, 11.
  • the holding part 19 is further provided with a bottom on which the cam element 1 rests. Between the actuating cylinder 18 and the holding part 19, a compression spring 4 is provided, which Holding part 19 presses against the cam element 1.
  • a locking element 8 is connected to the holding part 19, so that when the holding part 19 is moved, the locking element 8 is also moved, and the check valve 9 opens or closes.
  • the valve train now works as follows: At the beginning of the opening phase of the valve 13, the cam element 1 has the position shown in FIG. 1, in which the on the contour of the base circle 3 between the free space 2 and the cam area lying circumferential section rests on the holding part 19. If the cam element 1 rotates in the direction of the arrow in the position shown in Fig. 2, the holding part 19 pushed down. The actuating cylinder 18 lies on the stop 5 of the holding part and is also moved. The check valve 16 blocks the feed line 17, and that Blocking element 8 blocks the discharge line 6, so that the one enclosed in the pressure chamber 14 Pressure transmission medium can not escape. The loading by the Cam element 1 is thus transmitted directly to the piston 10, which is on the valve lifter is applied.
  • valve 13 lifts off the valve seat 12 and opens the inlet or Outlet region. With the further rotation in the position of FIG. 3, the relative remain Positions of all parts to each other unchanged, so that the valve 13 through the Valve spring 15 is moved back into the valve seat 12.
  • the derivative 6 remains locked, and the volume of the pressure chamber 14 unchanged. Since also the actuating cylinder 18 abuts the stop 5, the holding part 19 follows the receding contour of the Cam area until base circle 3 is reached.
  • the compression spring 4 takes over the further displacement of the Holding part 19, and the blocking element 8 from the check valve 9 - at least schematically - pulled out so that the derivative 6 is opened.
  • excess Pressure transmission medium can be braked by the throttle element 7 from the Drain pressure chamber 14.
  • a lower stop 15 of the holding element 19 limits the Effect of the compression spring 4, i.e. the actuating cylinder 18 can only touch the system on Stop 11 are moved, causing an excessive reduction in Pressure chamber volume is prevented despite the open shut-off valve 9.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Valve Device For Special Equipments (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

The method and apparatus are for continuously controlling a quantity of air drawn into an internal combustion engine by varying operating characteristics of an intake valve. A control unit uses a valve lift included in a range wherein the quantity of air is determined only by a valve lift and a working angle of the intake valve in a very low load operating range containing during idling. In contrast, in operating ranges, except the very low load operating range, the control unit uses a valve lift included in a range wherein the quantity of air is determined by the valve lift and the working angle of the intake valve, and a phase of a central angle of the working angle of the intake valve.

Description

Die Erfindung betrifft einen Ventiltrieb für eine Brennkraftmaschine, mit einem angetriebenen Nockenelement und mit einem vom Nockenbereich des sich drehenden Nockenelements gegen eine Schließfeder öffenbaren Ventil, das eine hydraulische Spielausgleichseinrichtung mit einer mit einem Rückschlagventil versehenen Zuleitung und einer Ableitung für ein Druckübertragungsmedium aufweist, wobei die Ableitung mittels eines federbeaufschlagten Sperrelements über den Nockenbereich des Nockenelements geschlossen und über den Grundkreisbereich offen ist.The invention relates to a valve train for an internal combustion engine, with a driven Cam element and with one of the cam area of the rotating Cam element against a closing spring openable valve, which is a hydraulic Backlash compensation device with a supply line provided with a check valve and a derivative for a pressure transmission medium, the derivative by means of a spring-loaded locking element over the cam area of the Cam element is closed and open over the base circle area.

Mechanische Ventiltriebe mit hydraulischen Spielausgleichseinrichtungen sind in großer Zahl und in verschiedenen Ausführungen bekannt. Sie dienen dazu, das Ventil im Ventilsitz zu justieren, sodaß es über den Grundkreisbereich des Nockenelementes auch tatsächlich einwandfrei geschlossen ist. Die Anpassung ergibt sich dabei durch die Höhe des Druckübertragungsmediums, insbesondere Öls, im Druckraum, die durch Veränderung des Zuflusses eingestellt werden kann. Die Ableitung weist einen erhöhten Strömungswiderstand auf, beispielsweise aufgrund eines geringen Querschnitts, eines Drosselelements od. dgl., um einen raschen Abfluß zu vermeiden. Da ein derartiger Ventilspielausgleich den Nachteil hat, daß das Medium aus dem Druckraum auch während des Öffnens des Ventils, also während der Beaufschlagung durch den Nockenbereich des Nockenelementes über die Ableitung austritt, wurde in der DE 41 24 184 A ein Ventiltrieb der eingangs genannten Art vorgeschlagen, der einen Tassenstößel beinhaltet. In der Tasse ist eine verschiebbare Innenhülse angeordnet, und in den Zwischenraum zwischen der Tasse und der Innenhülse greift eine im Zylinderkopf einstellbar angeordnete Zwischenhülse ein, wobei Durchtrittsöffnungen in den Hülsen abhängig von der Stellung des Nockenelementes geöffnet oder geschlossen sind. Auf diese Weise ist der Austritt des Druckübertragungsmediums während der Ventilöffnung unterbunden, und das Spielausgleichselement kann nicht komprimiert werden. Die Durchtrittsöffnungen werden erst wieder beim Übergang zum Grundkreisbereich frei, sodaß sich das Ventilspiel einrichtet.Mechanical valve trains with hydraulic lash adjusters are in large number and known in different versions. They serve the valve to adjust in the valve seat so that it over the base circle area of the cam element is actually closed properly. The adjustment results from the level of the pressure transmission medium, in particular oil, in the pressure chamber caused by Change in the inflow can be set. The derivative shows an increased Flow resistance, for example due to a small cross section, a throttle element or the like, in order to avoid rapid drainage. Because such Valve clearance compensation has the disadvantage that the medium from the pressure chamber too during the opening of the valve, i.e. during the application by the The cam area of the cam element exits via the derivative was described in DE 41 24 184 A proposed a valve train of the type mentioned, the tappet includes. A sliding inner sleeve is arranged in the cup, and in the space between the cup and the inner sleeve engages in the cylinder head an adjustable intermediate sleeve, with passage openings in the sleeves are opened or closed depending on the position of the cam element. On this is the exit of the pressure transmission medium during the valve opening prevented, and the game compensation element can not be compressed. The Through openings are only cleared again at the transition to the base circle area, so that the valve clearance is established.

Die Erfindung hat es sich nun zur Aufgabe gestellt, die Schaltung des Sperrelementes zu vereinfachen, und schlägt hierzu vor, daß der Grundkreisbereich des Nockenelements mit einem Freiraum versehen ist, in den das Sperrelement oder ein ihm zugeordneter Halteteil eintreten kann. The invention has now set itself the task of switching the locking element to simplify, and suggests that the base circle area of the cam member is provided with a space into which the locking element or one assigned to it Holding part can occur.

Ab dem Übergang vom Nockenbereich in den Grundkreisbereich öffnet sich der Freiraum des Nockenelementes und das Sperrelement kann unter der Wirkung einer Feder verschoben werden, sodaß die Ableitung des Druckübertragungselementes freigegeben wird. Das Sperrelement kann im Druckraum der hydraulischen Speicherausgleichseinrichtung angeordnet sein, wobei es verschiebbar in der Ventilachse liegen und mit einem zweiten Ende direkt in den Freiraum des Nockenelementes eingreifen kann. Bevorzugt ist das Sperrelement jedoch seitlich neben der Spielausgleichseinrichtung am Halteteil angeordnet, wobei dem Halteteil eine Druckfeder zugeordnet ist, die den Halteteil in die Vertiefung des Nockenelementes drückt.The free space opens from the transition from the cam area to the base circle area of the cam element and the locking element can under the action of a spring be moved so that the derivation of the pressure transmission element is released becomes. The locking element can be in the pressure chamber of the hydraulic accumulator compensation device be arranged, it being displaceable in the valve axis lie and with a second end directly in the free space of the cam element can intervene. However, the blocking element is preferably laterally next to the Match compensation device arranged on the holding part, wherein the holding part Compression spring is assigned, which holds the holding part in the recess of the cam element suppressed.

Der Halteteil des Sperrelementes ist bevorzugt auf der Spielausgleichseinrichtung verschiebbar angeordnet, und die Durckfeder zwischen der Spielausgleichseinrichtung und dem Halteteil vorgesehen.The holding part of the locking element is preferably displaceable on the play compensation device arranged, and the pressure spring between the game compensation device and the holding part provided.

In einer weiteren Ausführung ist vorgesehen, daß der Halteteil die Spielausgleichseinrichtung beiderseits axial überragt und Begrenzungsanschläge für den Verschiebeweg der Spielausgleichseinrichtung aufweist. Die Kraft der Druckfeder ist bevorzugt wesentlich geringer als die der Ventilschließfeder.In a further embodiment it is provided that the holding part the game compensation device protrudes axially on both sides and limit stops for the displacement the game compensation device. The force of the compression spring is preferably essential less than that of the valve closing spring.

Um einen zu raschen Abfluß des Druckübertragungsmediums bei geöffnetem Sperrventil zu verhindern, sind bevorzugt das Sperrventil und ein Drosselelement in Serie in der Ableitung angeordnet.In order to drain the pressure transmission medium too quickly when the shut-off valve is open To prevent the check valve and a throttle element in series are preferred the derivative arranged.

Nachstehend wird nun die Erfindung an Hand der Figuren der beiliegenden Zeichnung näher beschrieben, ohne darauf beschränkt zu sein.The invention will now be described with reference to the figures in the accompanying drawing described in more detail without being limited thereto.

Es zeigen:

  • Fig. 1 eine schematische Darstellung eines Ventiltriebes zu Beginn der Öffnungsphase,
  • Fig. 2 eine schematische Darstellung des Ventiltriebes bei maximaler Ventilöffnung,
  • Fig. 3 eine schematische Darstellung des Ventiltriebs am Ende der Öffnungsphase, und
  • Fig. 4 eine schematische Darstellung des Ventiltriebs in der Schließstellung.
    • Show it:
  • 1 is a schematic representation of a valve train at the beginning of the opening phase,
  • 2 is a schematic representation of the valve train with maximum valve opening,
  • Fig. 3 is a schematic representation of the valve train at the end of the opening phase, and
  • Fig. 4 is a schematic representation of the valve train in the closed position.

    • Ein Ventiltrieb für ein Ein- oder Auslaßventil 13 einer Brennkraftmaschine weist eine angetriebene Nockenwelle auf, auf der zumindest ein Nockenelement 1 angeordnet ist, das das Ventil 13 gegen eine Ventilfeder 14 öffnet. Das Nockenelement 1 weist einen Nockenbereich und einen Grundkreisbereich auf, in dem ein in bezug auf den Grundkreis 3 vertiefter Freiraum 2 vorgesehen ist. Zwischen dem Nockenelement 1 und dem Ventil 13 ist eine hydraulische Spielausgleichseinrichtung vorgesehen, die einen auf den Stößel des Ventils 13 wirkenden Kolben 10, einen tassenartigen Stellzylinder 18, in den der Kolben 10 verschiebbar eingreift, und einen Druckraum 14 zwischen dem Kolben 10 und dem Boden des Stellzylinders 18 umfaßt. Der Druckraum 14 ist über eine Zuleitung 17 und ein Rückschlagventil 16 mit einem Druckübertragungsmedium, insbesondere Öl, befüllbar und über eine Ableitung 6 entleerbar, in der ein Sperrventil 9 und ein Drosselelement 7 hintereinander angeordnet sind. Auf dem Stellzylinder 18 ist ein Halteteil 19 verschiebbar angeordnet, der beidseitig über den Stellzylinder 18 axial vorsteht und in den Verschiebeweg des Stellzylinders 18 ragende Begrenzungsanschläge 5, 11 aufweist. Der Halteteil 19 ist weiters mit einem Boden versehen, an dem das Nockenelement 1 anliegt. Zwischen dem Stellzylinder 18 und dem Halteteil 19 ist eine Druckfeder 4 vorgesehen, die den Halteteil 19 gegen das Nockenelement 1 drückt.A valve train for an intake or exhaust valve 13 of an internal combustion engine has one driven camshaft on which at least one cam element 1 is arranged, that opens the valve 13 against a valve spring 14. The cam element 1 has one Cam area and a base circle area in which one with respect to the Base circle 3 deepened space 2 is provided. Between the cam element 1 and the valve 13 is a hydraulic lash adjuster provided a piston 10 acting on the tappet of the valve 13, a cup-like Actuating cylinder 18, in which the piston 10 slidably engages, and a pressure chamber 14 between the piston 10 and the bottom of the actuating cylinder 18 comprises. The pressure room 14 is via a feed line 17 and a check valve 16 with a Pressure transmission medium, in particular oil, can be filled and via a discharge line 6 can be emptied, in which a check valve 9 and a throttle element 7 in a row are arranged. A holding part 19 is slidably arranged on the actuating cylinder 18, which projects axially on both sides via the actuating cylinder 18 and into the displacement path of the Actuating cylinder 18 has protruding limit stops 5, 11. The holding part 19 is further provided with a bottom on which the cam element 1 rests. Between the actuating cylinder 18 and the holding part 19, a compression spring 4 is provided, which Holding part 19 presses against the cam element 1.

    An der Seite der Ableitung 6 ist mit dem Halteteil 19 ein Sperrelement 8 verbunden, sodaß bei einer Verschiebung des Halteteils 19 das Sperrelement 8 mitbewegt wird, und das Sperrventil 9 öffnet bzw. schließt.On the side of the derivation 6, a locking element 8 is connected to the holding part 19, so that when the holding part 19 is moved, the locking element 8 is also moved, and the check valve 9 opens or closes.

    Die Funktion des Ventiltriebs ist nun folgendermaßen: Zu Beginn der Öffnungsphase des Ventils 13 weist das Nockenelement 1 die in Fig. 1 gezeigte Position auf, in der der auf der Kontur des Grundkreises 3 zwischen dem Freiraum 2 und dem Nockenbereich liegende Umfangsabschnitt auf dem Halteteil 19 aufliegt. Wenn sich das Nockenelement 1 in Richtung des Pfeiles in die in Fig. 2 gezeigte Stellung dreht, wird der Halteteil 19 nach unten verdrängt. Der Stellzylinder 18 liegt am Anschlag 5 des Halteteils an, und wird mitverschoben. Das Rückschlagventil 16 sperrt die Zuleitung 17, und das Sperrelement 8 sperrt die Ableitung 6, sodaß das im Druckraum 14 eingeschlossene Druckübertragungsmedium nicht entweichen kann. Die Beaufschlagung durch das Nockenelement 1 wird somit direkt auf den Kolben 10 übertragen, der am Ventilstößel anliegt. Das Ventil 13 hebt vom Ventilsitz 12 ab und öffnet den Ein- oder Auslaßbereich. Bei der Weiterdrehung in die Stellung der Fig. 3 bleiben die relativen Positionen aller Teile zueinander unverändert, sodaß das Ventil 13 durch die Ventilfeder 15 wieder in den Ventilsitz 12 zurückbewegt wird. Die Ableitung 6 bleibt gesperrt, und das Volumen des Druckraums 14 unverändert. Da auch der Stellzylinder 18 am Anschlag 5 anliegt, folgt der Halteteil 19 der zurückweichenden Kontur des Nockenbereiches, bis der Grundkreis 3 erreicht ist.The valve train now works as follows: At the beginning of the opening phase of the valve 13, the cam element 1 has the position shown in FIG. 1, in which the on the contour of the base circle 3 between the free space 2 and the cam area lying circumferential section rests on the holding part 19. If the cam element 1 rotates in the direction of the arrow in the position shown in Fig. 2, the holding part 19 pushed down. The actuating cylinder 18 lies on the stop 5 of the holding part and is also moved. The check valve 16 blocks the feed line 17, and that Blocking element 8 blocks the discharge line 6, so that the one enclosed in the pressure chamber 14 Pressure transmission medium can not escape. The loading by the Cam element 1 is thus transmitted directly to the piston 10, which is on the valve lifter is applied. The valve 13 lifts off the valve seat 12 and opens the inlet or Outlet region. With the further rotation in the position of FIG. 3, the relative remain Positions of all parts to each other unchanged, so that the valve 13 through the Valve spring 15 is moved back into the valve seat 12. The derivative 6 remains locked, and the volume of the pressure chamber 14 unchanged. Since also the actuating cylinder 18 abuts the stop 5, the holding part 19 follows the receding contour of the Cam area until base circle 3 is reached.

    Vor allem thermische Einflüsse können dazu führen, daß das Ventil 13 nicht richtig in den Ventilsitz eingetreten ist und ein geringer Spalt verbleibt. Um dies zu vermeiden, muß das Volumen des Druckraumes 14 verringert werden, sodaß der Kolben 10 tiefer in den Stellzylinder 18 eintreten kann. Bei der weiteren Drehung des Nockenelementes 1 in die Stellung gemäß Fig. 4 wird unter Ausbildung eines sogenannten Negativhubes der Freiraum2 im Grundkreisbereich wirksam, in den der Halteteil 19 eindringen kann. Es wird somit ein weiterer Wegabschnitt freigegeben, über den zuerst das gesamte Spielausgleichselement unter Wirkung der Ventilfeder 15 verschoben wird, bis das Ventil 13 vollständig geschlossen ist. Um die nötige Volumensverringerung im Druckraum 14 zu erzielen, übernimmt die Druckfeder 4 die weitere Verschiebung des Halteteiles 19, und das Sperrelement 8 wird aus dem Sperrventil 9 ― zumindest schematisch ― herausgezogen, sodaß die Ableitung 6 geöffnet wird. Überschüssiges Druckübertragungsmedium kann durch das Drosselelement 7 gebremst aus dem Druckraum 14 abfließen. Ein unterer Anschlag 15 des Halteelementes 19 begrenzt die Wirkung der Druckfeder 4, d.h. es kann der Stellzylinder 18 nur bis zur Anlage am Anschlag 11 verschoben werden, wodurch eine übermäßige Verringerung des Druckraumvolumens trotz geöffnetem Sperrventil 9 verhindert wird.Above all, thermal influences can lead to the valve 13 not being properly inserted the valve seat has entered and a small gap remains. To avoid this the volume of the pressure chamber 14 must be reduced so that the piston 10 is lower can enter the actuating cylinder 18. Upon further rotation of the cam element 1 in the position shown in FIG. 4, forming a so-called negative stroke the free space 2 is effective in the base circle area, into which the holding part 19 can penetrate. A further section of the route is thus released, over which the entire route first Backlash compensation element is moved under the action of the valve spring 15 until that Valve 13 is completely closed. The necessary volume reduction in the pressure room To achieve 14, the compression spring 4 takes over the further displacement of the Holding part 19, and the blocking element 8 from the check valve 9 - at least schematically - pulled out so that the derivative 6 is opened. excess Pressure transmission medium can be braked by the throttle element 7 from the Drain pressure chamber 14. A lower stop 15 of the holding element 19 limits the Effect of the compression spring 4, i.e. the actuating cylinder 18 can only touch the system on Stop 11 are moved, causing an excessive reduction in Pressure chamber volume is prevented despite the open shut-off valve 9.

    Soferne der Druckraum 14 zu wenig Medium enthält, strömt dieses über die Zuleitung 17 und das Rückschlagventil 16 nach, wobei das Drosselelement 7 gleichzeitig den raschen Abfluß unterbricht.If the pressure chamber 14 contains too little medium, this flows through the feed line 17 and the check valve 16 after, the throttle element 7 at the same time rapid drain interrupts.

    Bei der Weiterdrehung in die Position der Fig. 1 werden, da die Druckfeder 4 schwächer als die Ventilfeder 15 ist, zuerst der Halteteil 19 und das Sperrelement 8 bewegt, bis das Halteelement 19 am Stellzylinder 18 aufliegt, wobei das Sperrventil 9 geschlossen wird. Das Öffnen des Ventils 13 erfolgt somit wieder wie beschrieben, wobei ein Einsinken der Ventilspielausgleichseinrichtung aufgrund der gesperrten Ableitung 6 verhindert ist.When turning further into the position of FIG. 1, the compression spring 4 becomes weaker than the valve spring 15, the holding part 19 and the locking element 8 first move, until the holding element 19 rests on the actuating cylinder 18, the shut-off valve 9 being closed becomes. The valve 13 is thus opened again as described, with a Sinking of the valve lash adjuster due to the blocked derivative 6 is prevented.

    Claims (5)

    Ventiltrieb für eine Brennkraftmaschine, mit einem angetriebenen Nockenelement (1) und mit einem vom Nockenbereich des sich drehenden Nockenelements gegen eine Schließfeder (15) öffenbaren Ventil (13), das eine hydraulische Spielausgleichseinrichtung mit einer mit einem Rückschlagventil (16) versehenen Zuleitung (17) und einer Ableitung (6) für ein Druckübertragungsmedium aufweist, wobei der Ableitung (6) mittels eines federbeaufschlagten Sperrelements (8) über den Nockenbereich des Nockenelements (1) geschlossen und über den Grundkreisbereich offen ist, dadurch gekennzeichnet, daß der Grundkreisbereich des Nockenelements (1) mit einem Freiraum (2) versehen ist, in den das Sperrelement (8) oder ein ihm zugeordneter Halteteil (19) eintreten kann.Valve train for an internal combustion engine, with a driven cam element (1) and with a valve (13) which can be opened from the cam area of the rotating cam element against a closing spring (15), and which has a hydraulic lash adjuster with a feed line (17) provided with a check valve (16) and a discharge line (6) for a pressure transmission medium, the discharge line (6) being closed by means of a spring-loaded blocking element (8) over the cam area of the cam element (1) and open over the base circle area, characterized in that the base circle area of the cam element (1 ) is provided with a free space (2) into which the locking element (8) or a holding part (19) assigned to it can enter. Ventiltrieb nach Anspruch 1, dadurch gekennzeichnet, daß das Sperrelement (8) seitlich neben der Spielausgleichseinrichtung am Halteteil (19) angeordnet ist, wobei dem Halteteil (19) eine Druckfeder (4) zugeordnet ist.Valve drive according to claim 1, characterized in that the blocking element (8) is arranged laterally next to the play compensation device on the holding part (19), the holding part (19) being assigned a compression spring (4). Ventiltrieb nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Halteteil (19) des Sperrelementes (8) auf der Spielausgleichseinrichtung verschiebbar angeordnet ist, wobei die Druckfeder (4) zwischen der Spielausgleichseinrichtung und dem Halteteil (19) vorgesehen ist.Valve drive according to claim 1 or 2, characterized in that the holding part (19) of the locking element (8) is arranged displaceably on the play compensation device, the compression spring (4) being provided between the play compensation device and the holding part (19). Ventiltrieb nach Anspruch 3, dadurch gekennzeichnet, daß der Halteteil (19) die Spielausgleichseinrichtung beiderseits axial überragt und Begrenzungsanschläge (5, 11) für den Verschiebeweg der Spielausgleichseinrichtung aufweist.Valve drive according to claim 3, characterized in that the holding part (19) axially projects beyond the play compensation device and has limit stops (5, 11) for the displacement path of the play compensation device. Ventiltrieb nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß das Sperrelement (8) und ein Drosselelement (7) in Serie in der Ableitung (6) angeordnet sind.Valve train according to one of claims 1 to 4, characterized in that the blocking element (8) and a throttle element (7) are arranged in series in the discharge line (6).
    EP02002529A 2001-02-21 2002-02-04 Valve drive in an internal combustion engine Expired - Lifetime EP1234957B1 (en)

    Priority Applications (1)

    Application Number Priority Date Filing Date Title
    AT02002529T ATE263309T1 (en) 2001-02-21 2002-02-04 VALVE DRIVE FOR AN INTERNAL COMBUSTION ENGINE

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    AT2682001 2001-02-21
    AT2682001 2001-02-21

    Publications (3)

    Publication Number Publication Date
    EP1234957A2 true EP1234957A2 (en) 2002-08-28
    EP1234957A3 EP1234957A3 (en) 2003-01-08
    EP1234957B1 EP1234957B1 (en) 2004-03-31

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    ID=3670472

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP02002529A Expired - Lifetime EP1234957B1 (en) 2001-02-21 2002-02-04 Valve drive in an internal combustion engine

    Country Status (4)

    Country Link
    EP (1) EP1234957B1 (en)
    AT (1) ATE263309T1 (en)
    DE (1) DE50200316D1 (en)
    ES (1) ES2217209T3 (en)

    Cited By (2)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    WO2006037408A1 (en) * 2004-10-02 2006-04-13 Schaeffler Kg Variable valve drive for an internal combustion engine
    WO2010012864A1 (en) * 2008-07-31 2010-02-04 Wärtsilä Finland Oy A control arrangement in a piston engine

    Citations (1)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    DE4124184A1 (en) 1991-07-20 1993-01-21 Schaeffler Waelzlager Kg Hydraulic valve cup lifter - has axially adjustable sleeve co-axial with plunger and cup, and one or more bores lockable by cup

    Family Cites Families (5)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    DE1018880B (en) * 1955-05-31 1957-11-07 Albert Pomutz Hydraulic control, especially for the valves of piston engines
    FR2464372A1 (en) * 1979-08-30 1981-03-06 Semt METHOD AND DEVICE FOR IMPROVING THE EFFICIENCY OF AN INTERNAL COMBUSTION ENGINE BY SELECTIVE VARIATION AT THE ACTUAL COMPRESSION RATE ACCORDING TO THE MOTOR RPM
    DE4111610C2 (en) * 1990-07-27 1998-07-30 Audi Ag Device for changing the timing of a gas exchange valve
    JPH04301108A (en) * 1991-03-28 1992-10-23 Aisin Seiki Co Ltd Hydraulic lifter with valve stopping device
    DE19653459A1 (en) * 1996-12-20 1998-06-25 Schaeffler Waelzlager Ohg Tappet for a valve train of an internal combustion engine

    Patent Citations (1)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    DE4124184A1 (en) 1991-07-20 1993-01-21 Schaeffler Waelzlager Kg Hydraulic valve cup lifter - has axially adjustable sleeve co-axial with plunger and cup, and one or more bores lockable by cup

    Cited By (2)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    WO2006037408A1 (en) * 2004-10-02 2006-04-13 Schaeffler Kg Variable valve drive for an internal combustion engine
    WO2010012864A1 (en) * 2008-07-31 2010-02-04 Wärtsilä Finland Oy A control arrangement in a piston engine

    Also Published As

    Publication number Publication date
    ATE263309T1 (en) 2004-04-15
    ES2217209T3 (en) 2004-11-01
    EP1234957B1 (en) 2004-03-31
    DE50200316D1 (en) 2004-05-06
    EP1234957A3 (en) 2003-01-08

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