EP0787893A1 - Valve drive comprising pneumatic return spring for an internal combustion engine - Google Patents

Valve drive comprising pneumatic return spring for an internal combustion engine Download PDF

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Publication number
EP0787893A1
EP0787893A1 EP96119256A EP96119256A EP0787893A1 EP 0787893 A1 EP0787893 A1 EP 0787893A1 EP 96119256 A EP96119256 A EP 96119256A EP 96119256 A EP96119256 A EP 96119256A EP 0787893 A1 EP0787893 A1 EP 0787893A1
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EP
European Patent Office
Prior art keywords
closing spring
cylinder
internal combustion
combustion engine
piston
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Granted
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EP96119256A
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German (de)
French (fr)
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EP0787893B1 (en
Inventor
Ulrich Schulz
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Bayerische Motoren Werke AG
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Bayerische Motoren Werke AG
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/46—Component parts, details, or accessories, not provided for in preceding subgroups
    • F01L1/462—Valve return spring arrangements
    • F01L1/465—Pneumatic arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00—Liquid cooling
    • F01P3/12—Arrangements for cooling other engine or machine parts
    • F01P3/14—Arrangements for cooling other engine or machine parts for cooling intake or exhaust valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00—Liquid cooling
    • F01P2003/006—Liquid cooling the liquid being oil

Definitions

  • the invention is based on the preamble of claim 1 from DE-A 42 14 839.
  • the pneumatic closing spring designed as a piston / cylinder unit is pressed via its cylinder into a recess in the cylinder head of the internal combustion engine in order to achieve good dissipation of the heat generated when compressing the enclosed gas volume.
  • a material with good thermal conductivity such as a copper-beryllium alloy, is proposed to support the heat dissipation for the cylinder of this pneumatic spring.
  • the cylinder of the closing spring unit is designed with a considerable wall thickness to form cooling channels for the passage of lubricating oil flowing out of the valve train.
  • the aforementioned measures for cooling a pneumatic spring or closing spring are complex. These measures appear to be particularly complex in the case of valve-controlled closing springs with minimal gas leakage and in a type of pneumatic closing springs known from DE-A 29 49 413, in which the enclosed gas volume is displaced to a certain extent into a storage space at low engine speeds via an open throttle bore, but at high engine speeds due to the throttling, there is hardly any outflow and thus a temperature-effective gas exchange.
  • the invention has for its object to show a cooling arrangement for a pneumatic closing spring of a generic valve drive, which allows at least heat dissipation depending on the engine speed.
  • the advantage of the invention is a closing spring which is constantly flushed by the coolant of the machine due to the forced-circulation cooling, in particular speed-dependent, the spring characteristic, which may have been defined in connection with the heat of compression, being determined by means of a corresponding coolant application to the closing spring.
  • An advantageous embodiment of the invention describes claim 2, according to which the piston / cylinder unit of the closing spring in a forced-circulation-cooled cylinder head is arranged. This can be separate from the internal combustion engine or cooled together with it. Furthermore, claim 2 includes that the recess serving for the arrangement of the closing spring has a circumferential groove extending over the stroke range of the spring piston for a coolant-carrying chamber formed with the cylinder, which is advantageously simple to form.
  • a further development of the invention described in claim 3 is directed to the fact that the cylinder of the piston / cylinder unit of the closing spring designed as an insert (according to EP application No. 95111924.7) extends over the outer circumference in the above-mentioned manner. Circumferential groove adjacent machine-side areas cooperates sealing devices.
  • the piston / cylinder unit of the pneumatic closing spring proposed in accordance with EP application 95111924.7 is designed as a one-chamber functional unit which is sealed off from the environment with the aim of testing it for leaks and function before installation in the internal combustion engine to be able to.
  • the spring function of the insert designed as a functional unit as a result of deformation due to a press fit which is primarily matched to the seal against the coolant according to claim 3, sealing means cooperating with the outer circumference of the insert cylinder are proposed, whereby in advantageously a much smaller press fit is possible.
  • claim 4 describes a multi-valve internal combustion engine which, outside of its cooling jacket in the cylinder head, has separately arranged cooling chambers of the closing springs connected by a common channel which, when the coolant of the internal combustion engine is used to cool the closing springs, is connected to the cooling jacket.
  • the cooling jacket of the cylinder head can be optimized separately from the closing spring cooling chambers, the speed-dependent cooling of the closing spring or closing springs according to the invention being achievable with the design of the channel, for example with a constant or variable cross section over its length.
  • claim 5 describes the use of a lubricant of the internal combustion engine as a coolant for separately arranged cooling chambers for the closing springs, the cooling chambers of the closing springs possibly being arranged in the lubrication system of the internal combustion engine.
  • a valve train 1 of an internal combustion engine 2 (not shown in detail) comprises a control shaft 4 in a liquid-cooled cylinder head 3 for actuating a valve 5 of a gas exchange channel 6.
  • the valve 5 is assigned a pneumatic closing spring 7, which is designed as a piston / cylinder unit 8 in one machine-side recess 9 is arranged.
  • the cylinder 10 of the unit 8 of the closing spring 7 is extended in the direction of the control shaft 4 for slidably receiving a cup tappet 12 which interacts with a control cam 11 of the control shaft 4 and which acts directly on a stem 13 of the gas exchange valve 5.
  • a piston 14, which is connected to the valve stem 13 in a drive-fixed manner, is arranged in the cylinder 10 and serves as a movable closure of a compression chamber 15 of the pneumatic closing spring 7.
  • the compression chamber 15 is connected to a gas-carrying supply line 16.
  • the closing spring unit 8 formed from the cylinder 10 and the piston 14 is designed according to the subject of EP application 95111924.7 as a one-chamber functional unit which is sealed off from the environment in order to advantageously remove it from the place of use prior to installation in the internal combustion engine 2 or to be able to check for tightness and function in the cylinder head 3.
  • the closing spring 7 can either have a compression chamber 15 which can be closed with respect to the supply line 16 by means of a non-return valve, not shown in FR-A 2 529 616, or one in accordance with DE-A 29 49 413 in conjunction with GB-PS 392 294 supply line 16 via a small throttle bore, not shown, constantly communicating compression chamber 15.
  • the invention provides that the cylinder 10 of the closing spring 7 has an coolant-carrying chamber 18 of a liquid-cooled internal combustion engine 2, preferably by means of a not shown, via an outer circumferential section 17 at least in the stroke range of the spring piston 14 Pump forced cooling is connected.
  • the piston / cylinder unit 8 of the closing spring 7 is preferably arranged in a forced-circulation-cooled cylinder head 3, the recess 9 serving to arrange the closing spring 7 having a circumferential groove 19 which extends over the stroke range of the spring piston 14 and which is connected to the cylinder 10 forms a coolant-carrying chamber 18.
  • cooling chambers 18 of the closing springs 7 are connected outside their cooling jacket 22 in the cylinder head 3 by means of a common channel 23, which is connected to the machine-side cooling jacket 22 when the coolant of the internal combustion engine 2 is used to cool the closing springs 7 .
  • the coolant circulating in the internal combustion engine 2 preferably cooling water, is used for heat dissipation from the pneumatic closing spring 7.
  • Closing springs 7 in separately arranged cooling chambers 18 can also be cooled by means of lubricating oil of the internal combustion engine 2, bearings of the control shaft 4 being supplied in each case from a cooling chamber 18 or from the common channel 23 of the cooling chambers 18. In this arrangement, the cooling chambers 18 and the channel 23 are integrated into the lubrication system of the internal combustion engine 2.
  • the recess 9 can be supplemented by an annular channel 24 for collecting and discharging lubricating oil which is applied from the compression chamber 15 via a pressure relief valve, not shown.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)

Abstract

The valve actuator comprises a locking spring (7) cylinder (10) which is arranged at least in the lift area of the locking spring piston (14) with cooling medium force-circulated in the cooling jacket (22) of the liquid cooled internal combustion engine. The housing (9) for location of the locking spring has a circumferential slot (19) extending over the lift area of the locking spring piston for a cooling medium directing chamber (18) formed with the cylinder.

Description

Die Erfindung geht gemäß dem Oberbegriff des Patentanspruches 1 von der DE-A 42 14 839 aus.The invention is based on the preamble of claim 1 from DE-A 42 14 839.

Bei diesem bekannten Ventiltrieb ist die als Kolben-/Zylinder-Einheit gestaltete pneumatische Schließfeder über ihren Zylinder in eine Ausnehmung des Zylinderkopfes der Brennkraftmaschine eingepreßt zur Erzielung einer guten Ableitung der beim Komprimieren des eingeschlossenen Gasvolumens entstehenden Wärme.In this known valve train, the pneumatic closing spring designed as a piston / cylinder unit is pressed via its cylinder into a recess in the cylinder head of the internal combustion engine in order to achieve good dissipation of the heat generated when compressing the enclosed gas volume.

Weiter ist zur Unterstützung der Wärmeableitung für den Zylinder dieser pneumatischen Feder ein Material mit guter Wärmeleitfähigkeit, wie beispielsweise eine Kupfer-Beryllium-Legierung vorgeschlagen.Furthermore, a material with good thermal conductivity, such as a copper-beryllium alloy, is proposed to support the heat dissipation for the cylinder of this pneumatic spring.

Schließlich ist zur zusätzlichen Wärmeableitung der Zylinder der Schließfeder-Einheit mit einer erheblichen Wandstärke ausgebildet zur Ausbildung von Kühlkanälen zum Durchlauf von aus dem Ventiltrieb ablaufendem Schmieröl.Finally, for additional heat dissipation, the cylinder of the closing spring unit is designed with a considerable wall thickness to form cooling channels for the passage of lubricating oil flowing out of the valve train.

Die vorgenannten Maßnahmen zur Kühlung einer pneumatischen Feder bzw. Schließfeder sind aufwendig. Besonders aufwendig erscheinen diese Maßnahmen bei ventilgesteuerten Schließfedern mit einer minimalen Gasleckage sowie bei einer aus der DE-A 29 49 413 bekannten Bauart von pneumatischen Schließfedern, bei denen das eingeschlossene Gasvolumen bei niedrigen Maschinendrehzahlen zwar jeweils über eine offene Drosselbohrung in gewissem Umfang in einen Speicherraum verdrängt ist, jedoch bei hohen Maschinendrehzahlen aufgrund der Drosselung kaum ein Abströmen und damit ein temperaturwirksamer Gasaustausch erfolgt. Dieses drehzahlabhängig drosselbedingt verhinderte Abströmen von Gas in einen nach außen abgeschlossenen Speicherraum oder gemäß der GB-PS 392 294 in einen in der Gasversorgungsleitung angeordneten Speicher ergibt wie bei einer ventilgesteuerten Schließfeder mit minimaler Leckage eine drehzahlabhängige Veränderung der Schließfeder-Rückstellkräfte bei erheblichem Anfall an Kompressionswärme aufgrund zu kleinen Gasaustausches. Diese Kompressionswärme kann bei längerem Betrieb in höheren Maschinendrehzahlen und ungenügender Wärmeabfuhr zu einer härteren bzw. steileren Federkennlinie der Schließfeder mit nachteiliger Zunahme an Reibleistung im Ventiltrieb führen.The aforementioned measures for cooling a pneumatic spring or closing spring are complex. These measures appear to be particularly complex in the case of valve-controlled closing springs with minimal gas leakage and in a type of pneumatic closing springs known from DE-A 29 49 413, in which the enclosed gas volume is displaced to a certain extent into a storage space at low engine speeds via an open throttle bore, but at high engine speeds due to the throttling, there is hardly any outflow and thus a temperature-effective gas exchange. This speed-dependent throttle-prevented flow of gas into an externally closed storage space or, according to GB-PS 392 294, into a storage arranged in the gas supply line results, like a valve-controlled closing spring with minimal leakage, in a speed-dependent change in the closing spring restoring forces with a considerable amount of compression heat due to to small gas exchanges. During long periods of operation at higher engine speeds and insufficient heat dissipation, this heat of compression can lead to a harder or steeper spring characteristic of the closing spring with a disadvantageous increase in friction in the valve train.

Der Erfindung liegt die Aufgabe zugrunde, für eine pneumatische Schließfeder eines gattungsgemäßen Ventiltriebes eine Kühlanordnung aufzuzeigen, die zumindest eine in Abhängigkeit der Maschinendrehzahl bewirkte Wärmeabfuhr ermöglicht.The invention has for its object to show a cooling arrangement for a pneumatic closing spring of a generic valve drive, which allows at least heat dissipation depending on the engine speed.

Diese Aufgabe ist gemäß dem Patentanspruch 1 dadurch gelöst, daß der Zylinder der Einheit der Schließfeder über einen Außenumfangsabschnitt mindestens im Hubbereich des Schließfeder-Kolbens von einem im Kühlmantel einer flüssigkeitsgekühlten Brennkraftmaschine zwangsumgewälzten Kühlmittel beaufschlagt angeordnet ist.This object is achieved according to claim 1 in that the cylinder of the unit of the closing spring is arranged over an outer circumferential portion at least in the stroke range of the closing spring piston by a coolant which is forced circulated in the cooling jacket of a liquid-cooled internal combustion engine.

Der Vorteil der Erfindung ist eine durch die Zwangsumlaufkühlung ständig und insbesondere drehzahlabhängig vom Kühlmittel der Maschine umspülte Schließfeder, wobei die gegebenenfalls in Verbindung mit der Kompressionswärme festgelegte Federkennlinie mittels einer entsprechenden Kühlmittelbeaufschlagung der Schließfeder bestimmt ist.The advantage of the invention is a closing spring which is constantly flushed by the coolant of the machine due to the forced-circulation cooling, in particular speed-dependent, the spring characteristic, which may have been defined in connection with the heat of compression, being determined by means of a corresponding coolant application to the closing spring.

Eine vorteilhafte Ausgestaltung der Erfindung beschreibt Anspruch 2, wonach die Kolben-/Zylinder-Einheit der Schließfeder in einem zwangsumlaufgekühlten Zylinderkopf angeordnet ist. Dieser kann von der Brennkraftmaschine gesondert oder mit dieser gemeinsam gekühlt sein. Weiter umfaßt Anspruch 2, daß die der Anordnung der Schließfeder dienende Ausnehmung eine über den Hubbereich des Feder-Kolbens sich erstreckende Umfangsnut aufweist für eine mit dem Zylinder gebildete kühlmittelführende Kammer, die vorteilhafterweise einfach auszubilden ist.An advantageous embodiment of the invention describes claim 2, according to which the piston / cylinder unit of the closing spring in a forced-circulation-cooled cylinder head is arranged. This can be separate from the internal combustion engine or cooled together with it. Furthermore, claim 2 includes that the recess serving for the arrangement of the closing spring has a circumferential groove extending over the stroke range of the spring piston for a coolant-carrying chamber formed with the cylinder, which is advantageously simple to form.

Eine im Anspruch 3 beschriebene Weiterbildung der Erfindung ist darauf gerichtet, daß der Zylinder der als ein Einsatz (gemäß EP-Anmeldung Nr. 95111924.7) gestalteten Kolben-/Zylinder-Einheit der Schließfeder über den Außenumfang mit in der o.g. Umfangsnut benachbarten maschinenseitigen Bereichen angeordneten Dichteinrichtungen zusammenwirkt.A further development of the invention described in claim 3 is directed to the fact that the cylinder of the piston / cylinder unit of the closing spring designed as an insert (according to EP application No. 95111924.7) extends over the outer circumference in the above-mentioned manner. Circumferential groove adjacent machine-side areas cooperates sealing devices.

Die gemäß der EP-Anmeldung 95111924.7 vorgeschlagene Kolben-/Zylinder-Einheit der pneumatischen Schließfeder ist als eine gegen die Umgebung dicht abgeschlossene Ein-Kammer-Funktionseinheit gestaltet mit dem Ziel, diese fern vom Einsatzort vor der Montage in die Brennkraftmaschine auf Dichtheit und Funktion prüfen zu können. Um bei der Montage dieses als Funktionseinheit gestalteten Einsatzes dessen Federfunktion nicht infolge Verformung durch im wesentlichen einen vor allem auf Abdichtung gegen das Kühlmittel abgestimmten Preßsitz zu gefährden, sind gemäß Anspruch 3 mit dem Außenumfang des Einsatz-Zylinders zusammenwirkende, maschinenseitig fixierte Dichteinrichtungen vorgeschlagen, wodurch in vorteilhafter Weise ein wesentlich geringerer Preßsitz möglich ist.The piston / cylinder unit of the pneumatic closing spring proposed in accordance with EP application 95111924.7 is designed as a one-chamber functional unit which is sealed off from the environment with the aim of testing it for leaks and function before installation in the internal combustion engine to be able to. In order not to endanger the spring function of the insert designed as a functional unit as a result of deformation due to a press fit which is primarily matched to the seal against the coolant, according to claim 3, sealing means cooperating with the outer circumference of the insert cylinder are proposed, whereby in advantageously a much smaller press fit is possible.

Schließlich beschreibt Anspruch 4 eine mehrventilige Brennkraftmaschine, die außerhalb ihres Kühlmantels im Zylinderkopf gesondert angeordnete Kühl-Kammern der Schließfedern durch einen gemeinsamen Kanal verbunden aufweist, der bei Verwendung des Kühlmittels der Brennkraftmaschine zur Kühlung der Schließfedern mit dem Kühlmantel in Verbindung steht. Mit dieser Ausgestaltung kann der Kühlmantel des Zylinderkopfes gesondert von den Schließfeder-Kühlkammern optimiert werden, wobei mit der Gestaltung des Kanals beispielsweise mit konstantem oder veränderlichem Querschnitt über seine Länge die erfindungsgemäße drehzahlabhängige Kühlung der Schließfeder bzw. Schließfedern erzielbar ist.Finally, claim 4 describes a multi-valve internal combustion engine which, outside of its cooling jacket in the cylinder head, has separately arranged cooling chambers of the closing springs connected by a common channel which, when the coolant of the internal combustion engine is used to cool the closing springs, is connected to the cooling jacket. With this configuration, the cooling jacket of the cylinder head can be optimized separately from the closing spring cooling chambers, the speed-dependent cooling of the closing spring or closing springs according to the invention being achievable with the design of the channel, for example with a constant or variable cross section over its length.

Schlußendlich beschreibt Anspruch 5 für gesondert angeordnete Kühl-Kammern für die Schließfedern den Einsatz eines Schmiermittels der Brennkraftmaschine als Kühlmittel, wobei gegebenenfalls die Kühl-Kammern der Schließfedern im Schmiersystem der Brennkraftmaschine angeordnet sind.Finally, claim 5 describes the use of a lubricant of the internal combustion engine as a coolant for separately arranged cooling chambers for the closing springs, the cooling chambers of the closing springs possibly being arranged in the lubrication system of the internal combustion engine.

Die Erfindung ist anhand eines in der Zeichnung dargestellten Ausführungsbeispiels beschrieben.The invention is described with reference to an embodiment shown in the drawing.

Ein Ventiltrieb 1 einer nicht näher gezeigten Brennkraftmaschine 2 umfaßt in einem flüssigkeitsgekühlten Zylinderkopf 3 eine Steuerwelle 4 zur Betätigung eines Ventils 5 eines Gaswechselkanals 6. Dem Ventil 5 ist eine pneumatische Schließfeder 7 zugeordnet, die als eine Kolben-/Zylinder-Einheit 8 gestaltet in einer maschinenseitigen Ausnehmung 9 angeordnet ist.A valve train 1 of an internal combustion engine 2 (not shown in detail) comprises a control shaft 4 in a liquid-cooled cylinder head 3 for actuating a valve 5 of a gas exchange channel 6. The valve 5 is assigned a pneumatic closing spring 7, which is designed as a piston / cylinder unit 8 in one machine-side recess 9 is arranged.

Der Zylinder 10 der Einheit 8 der Schließfeder 7 ist in Richtung der Steuerwelle 4 zur gleitbeweglichen Aufnahme eines mit einem Steuernocken 11 der Steuerwelle 4 zusammenwirkenden Tassenstößels 12 verlängert, der direkt auf einen Schaft 13 des Gaswechselventils 5 einwirkt. Weiter ist in dem Zylinder 10 ein mit dem Ventilschaft 13 antriebsfest verbundener Kolben 14 angeordnet, der als beweglicher Abschluß einer Kompressionskammer 15 der pneumatischen Schließfeder 7 dient. Die Kompressionskammer 15 steht mit einer gasführenden Versorgungsleitung 16 in Verbindung.The cylinder 10 of the unit 8 of the closing spring 7 is extended in the direction of the control shaft 4 for slidably receiving a cup tappet 12 which interacts with a control cam 11 of the control shaft 4 and which acts directly on a stem 13 of the gas exchange valve 5. In addition, a piston 14, which is connected to the valve stem 13 in a drive-fixed manner, is arranged in the cylinder 10 and serves as a movable closure of a compression chamber 15 of the pneumatic closing spring 7. The compression chamber 15 is connected to a gas-carrying supply line 16.

Vorzugsweise ist die aus Zylinder 10 und Kolben 14 gebildete Schließfeder-Einheit 8 gemäß dem Gegenstand der EP-Anmeldung 95111924.7 als eine gegen die Umgebung dicht abgeschlossene Ein-Kammer-Funktionseinheit gestaltet, um diese vorteilhafterweise fern vom Einsatzort vor der Montage in der Brennkraftmaschine 2 bzw. im Zylinderkopf 3 auf Dichtheit und Funktion prüfen zu können.Preferably, the closing spring unit 8 formed from the cylinder 10 and the piston 14 is designed according to the subject of EP application 95111924.7 as a one-chamber functional unit which is sealed off from the environment in order to advantageously remove it from the place of use prior to installation in the internal combustion engine 2 or to be able to check for tightness and function in the cylinder head 3.

Ferner kann die Schließfeder 7 entweder gemäß der FR-A 2 529 616 eine gegenüber der Versorgungsleitung 16 mittels eines nicht gezeigten Rückschlagventiles verschließbare Kompressionskammer 15 aufweisen oder aber gemäß der DE-A 29 49 413 in Verbindung mit der GB-PS 392 294 eine mit der Versorgungsleitung 16 über eine nicht gezeigte kleine Drosselbohrung ständig kommunizierende Kompressionskammer 15.Furthermore, the closing spring 7 can either have a compression chamber 15 which can be closed with respect to the supply line 16 by means of a non-return valve, not shown in FR-A 2 529 616, or one in accordance with DE-A 29 49 413 in conjunction with GB-PS 392 294 supply line 16 via a small throttle bore, not shown, constantly communicating compression chamber 15.

Zur Erzielung einer in Abhängigkeit der Maschinendrehzahl bewirkten Wärmeabfuhr bzw. Kühlung ist erfindungsgemäß vorgesehen, daß der Zylinder 10 der Schließfeder 7 über einen Außenumfangsabschnitt 17 mindestens im Hubbereich des Feder-Kolbens 14 mit einer kühlmittelführenden Kammer 18 einer flüssigkeitsgekühlten Brennkraftmaschine 2 mit vorzugsweise durch eine nicht gezeigte Pumpe bewirkte Zwangsumlaufkühlung in Verbindung steht.In order to achieve heat dissipation or cooling which is effected as a function of the machine speed, the invention provides that the cylinder 10 of the closing spring 7 has an coolant-carrying chamber 18 of a liquid-cooled internal combustion engine 2, preferably by means of a not shown, via an outer circumferential section 17 at least in the stroke range of the spring piston 14 Pump forced cooling is connected.

Vorzugsweise ist die Kolben-/Zylinder-Einheit 8 der Schließfeder 7 in einem zwangsumlaufgekühlten Zylinderkopf 3 angeordnet, wobei die der Anordnung der Schließfeder 7 dienende Ausnehmung 9 eine über den Hubbereich des Feder-Kolbens 14 sich erstreckende Umfangsnut 19 aufweist, die mit dem Zylinder 10 eine kühlmittelführende Kammer 18 bildet.The piston / cylinder unit 8 of the closing spring 7 is preferably arranged in a forced-circulation-cooled cylinder head 3, the recess 9 serving to arrange the closing spring 7 having a circumferential groove 19 which extends over the stroke range of the spring piston 14 and which is connected to the cylinder 10 forms a coolant-carrying chamber 18.

Weiter zeigt die einzige Figur, daß der Zylinder 10 der als ein Einsatz gemäß der EP-Anmeldung Nr. 95111924.7 gestalteten Kolben-/Zylinder-Einheit 8 der Schließfeder 7 über den Außenumfang mit in der Umfangsnut 19 bzw. der Kammer 18 benachbarten maschinen- bzw. zylinderkopfseitigen Bereichen 20 angeordneten Dichteinrichtungen 21 vorzugsweise O-Ringen zusammenwirkt.Furthermore, the only figure shows that the cylinder 10 of the piston / cylinder unit 8 of the closing spring 7, which is designed as an insert according to EP Application No. 95111924.7, extends over the outer circumference with machine or machine 18 adjacent in the circumferential groove 19 or the chamber 18 regions 20 arranged on the cylinder head side preferably cooperate with O-rings.

Dies ermöglicht in vorteilhafter Weise die Anordnung der Einheit 8 mit einem geringeren Preßsitz des Zylinders 10 in der Ausnehmung 9 des Zylinderkopfes 3.This advantageously enables the arrangement of the unit 8 with a smaller press fit of the cylinder 10 in the recess 9 of the cylinder head 3.

Bei einer mehrventiligen Brennkraftmaschine 2 sind außerhalb ihres Kühlmantels 22 im Zylinderkopf 3 gesondert angeordnete Kühl-Kammern 18 der Schließfedern 7 mittels eines gemeinsamen Kanals 23 verbunden, der bei Verwendung des Kühlmittels der Brennkraftmaschine 2 zur Kühlung der Schließfedern 7 mit dem maschinenseitigen Kühlmantel 22 in Verbindung steht.In a multi-valve internal combustion engine 2, separately arranged cooling chambers 18 of the closing springs 7 are connected outside their cooling jacket 22 in the cylinder head 3 by means of a common channel 23, which is connected to the machine-side cooling jacket 22 when the coolant of the internal combustion engine 2 is used to cool the closing springs 7 .

Zur Wärmeableitung aus der pneumatischen Schließfeder 7 dient das in der Brennkraftmaschine 2 umlaufende Kühlmittel, vorzugsweise Kühlwasser. Unabhängig vom jeweiligen in der Brennkraftmaschine verwendeten Kühlmittel können Schließfedern 7 in gesondert angeordneten Kühl-Kammern 18 auch mittels Schmieröl der Brennkraftmaschine 2 gekühlt sein, wobei Lager der Steuerwelle 4 jeweils aus einer Kühl-Kammer 18 oder aus dem gemeinsamen Kanal 23 der Kühl-Kammern 18 versorgt sind. Bei dieser Anordnung sind die Kühl-Kammern 18 und der Kanal 23 in das Schmiersystem der Brennkraftmaschine 2 eingebunden.The coolant circulating in the internal combustion engine 2, preferably cooling water, is used for heat dissipation from the pneumatic closing spring 7. Regardless of the respective coolant used in the internal combustion engine Closing springs 7 in separately arranged cooling chambers 18 can also be cooled by means of lubricating oil of the internal combustion engine 2, bearings of the control shaft 4 being supplied in each case from a cooling chamber 18 or from the common channel 23 of the cooling chambers 18. In this arrangement, the cooling chambers 18 and the channel 23 are integrated into the lubrication system of the internal combustion engine 2.

Schließlich kann die Ausnehmung 9 gemäß der einzigen Figur um einen Ringkanal 24 ergänzt sein zum Auffangen und Ableiten von aus der Kompressionskammer 15 über ein nicht gezeigtes Überdruckventil ausgebrachtes Schmieröl.Finally, according to the single figure, the recess 9 can be supplemented by an annular channel 24 for collecting and discharging lubricating oil which is applied from the compression chamber 15 via a pressure relief valve, not shown.

Claims (5)

Ventiltrieb für Brennkraftmaschinen mit einer pneumatischen Schließfeder für ein Gaswechselventil, - wobei die in einer maschinenseitigen Ausnehmung (9) als Kolben/Zylinder-Einheit (8) angeordnete Schließfeder (7) über ihren den Schließfeder-Kolben (14) aufnehmenden Zylinder (10) flüssigkeitsgekühlt ist,
   dadurch gekennzeichnet, - daß der Zylinder (10) der Schließfeder (7) über einen Außenumfangsabschnitt (17) mindestens im Hubbereich des Schließfeder-Kolbens (14) von einem im Kühlmantel (22) einer flüssigkeitsgekühlten Brennkraftmaschine (2 bzw. Zylinderkopf 3) zwangsumgewälzten Kühlmittel beaufschlagt angeordnet ist. Valve train for internal combustion engines with a pneumatic closing spring for a gas exchange valve, - The closing spring (7) arranged in a machine-side recess (9) as a piston / cylinder unit (8) is liquid-cooled via its cylinder (10) receiving the closing spring piston (14),
characterized, - That the cylinder (10) of the closing spring (7) via an outer peripheral portion (17) at least in the stroke range of the closing spring piston (14) by a cooling jacket (22) of a liquid-cooled internal combustion engine (2 or cylinder head 3) forced circulation coolant is arranged . Ventiltrieb nach Anspruch 1, dadurch gekennzeichnet, - daß die Kolben-/Zylinder-Einheit (8) der Schließfeder (7) in einem zwangsumlaufgekühlten Zylinderkopf (3) angeordnet ist, wobei - die der Anordnung der Schließfeder (7) dienende Ausnehmung (9) eine über den Hubbereich des Schließfeder-Kolbens (14) sich erstreckende Umfangsnut (19) aufweist für eine mit dem Zylinder (10) gebildete, kühlmittelführende Kammer (18). Valve train according to claim 1, characterized in - That the piston / cylinder unit (8) of the closing spring (7) is arranged in a force-cooled cylinder head (3), wherein - The arrangement of the closing spring (7) serving recess (9) over the stroke range of the closing spring piston (14) extending circumferential groove (19) for a with the cylinder (10) formed, coolant-carrying chamber (18). Ventiltrieb nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Zylinder (10) der als ein Einsatz gestalteten Kolben-/Zylinder-Einheit (8) der Schließfeder (7) über den Außenumfang mit in der Umfangsnut (19) bzw. der Kammer (18) benachbarten maschinenseitigen Bereichen (20) angeordneten Dichteinrichtungen (21, O-Ringe) zusammenwirkt.Valve drive according to claim 1 or 2, characterized in that the cylinder (10) of the piston / cylinder unit (8) of the closing spring (7) designed as an insert extends over the outer circumference with the circumferential groove (19) or the chamber ( 18) adjacent machine-side areas (20) arranged sealing devices (21, O-rings) cooperates. Ventiltrieb nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, - daß im Zylinderkopf (3) außerhalb des Kühlmantels (22) gesondert angeordnete Kühl-Kammern (18) für mehrere Schließfedern (7) mittels eines gemeinsamen Kanals (23) verbunden sind, der - bei Verwendung des Kühlmittels der Brennkraftmaschine (2) zur Kühlung der Schließfedern (7) mit dem Kühlmantel (22) der Brennkraftmaschine (2) in Verbindung steht. Valve train according to one of claims 1 to 3, characterized in that - That in the cylinder head (3) outside the cooling jacket (22) separately arranged cooling chambers (18) for a plurality of closing springs (7) are connected by means of a common channel (23) - When using the coolant of the internal combustion engine (2) for cooling the closing springs (7) with the cooling jacket (22) of the internal combustion engine (2) is connected. Ventiltrieb nach Anspruch 4, dadurch gekennzeichnet, - daß ein Schmiermittel der Brennkraftmaschine (2) als Kühlmittel der Schließfeder(n) (7) dient, wobei - gegebenenfalls die Kühl-Kammer(n) (18) der Schließfeder(n) (7) im Schmiersystem der Brennkraftmaschine (2) angeordnet ist bzw. sind. Valve train according to claim 4, characterized in - That a lubricant of the internal combustion engine (2) serves as a coolant for the closing spring (s) (7), wherein - If appropriate, the cooling chamber (s) (18) of the closing spring (s) (7) in the lubrication system of the internal combustion engine (2) is or are.
EP96119256A 1996-02-01 1996-12-02 Valve drive comprising pneumatic return spring for an internal combustion engine Expired - Lifetime EP0787893B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19603536 1996-02-01
DE19603536A DE19603536C2 (en) 1996-02-01 1996-02-01 Valve train for an internal combustion engine with a pneumatic closing spring for a gas exchange valve

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EP0787893A1 true EP0787893A1 (en) 1997-08-06
EP0787893B1 EP0787893B1 (en) 2001-04-04

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Cited By (4)

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Publication number Priority date Publication date Assignee Title
EP1143115A2 (en) * 2000-04-05 2001-10-10 Bayerische Motoren Werke Aktiengesellschaft Return spring arrangement for valve operation of an internal combustion engine
CN106922161A (en) * 2014-11-13 2017-07-04 丰田自动车株式会社 The cylinder head of multiple cylinder engine
CN107002591A (en) * 2014-11-13 2017-08-01 丰田自动车株式会社 The cylinder head of multiple cylinder engine
CN110520602A (en) * 2017-01-20 2019-11-29 斗山英维高株式会社 Adapter for engine roller tapper and the engine roller tapper component including the adapter

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19632628A1 (en) 1996-08-13 1998-02-19 Bayerische Motoren Werke Ag Pneumatic spring, in particular closing spring for a gas exchange valve of an internal combustion engine
DE102022111123A1 (en) 2022-05-05 2023-11-09 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Gas exchange valve arrangement for internal combustion engines and valve train arrangement

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GB392294A (en) 1932-02-09 1933-05-18 Albert Eustace Short Improvements in or relating to valve mechanism for internal combustion engines
FR2378945A1 (en) * 1977-01-28 1978-08-25 Sulzer Ag INTERNAL COMBUSTION ENGINE
DE2949413A1 (en) 1979-12-08 1981-06-11 Volkswagenwerk Ag, 3180 Wolfsburg IC engine valve resetting force changing device - uses pneumatic springs in addition to coiled valve springs with cam actuation
FR2529616A1 (en) 1982-06-30 1984-01-06 Renault Sport Pneumatic valve return system for an internal-combustion engine.
EP0269587A1 (en) * 1986-10-20 1988-06-01 Ab Volvo Valve spring device in internal-combustion engines
DE4214839A1 (en) 1992-05-05 1993-11-11 Audi Ag Valve drive for IC engine - involves lift valve operated in opening direction by cam against force of pneumatic spring
EP0646700A2 (en) * 1993-09-30 1995-04-05 Yamaha Hatsudoki Kabushiki Kaisha Pneumatic valve system for internal combustion engine

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB392294A (en) 1932-02-09 1933-05-18 Albert Eustace Short Improvements in or relating to valve mechanism for internal combustion engines
FR2378945A1 (en) * 1977-01-28 1978-08-25 Sulzer Ag INTERNAL COMBUSTION ENGINE
DE2949413A1 (en) 1979-12-08 1981-06-11 Volkswagenwerk Ag, 3180 Wolfsburg IC engine valve resetting force changing device - uses pneumatic springs in addition to coiled valve springs with cam actuation
FR2529616A1 (en) 1982-06-30 1984-01-06 Renault Sport Pneumatic valve return system for an internal-combustion engine.
EP0269587A1 (en) * 1986-10-20 1988-06-01 Ab Volvo Valve spring device in internal-combustion engines
DE4214839A1 (en) 1992-05-05 1993-11-11 Audi Ag Valve drive for IC engine - involves lift valve operated in opening direction by cam against force of pneumatic spring
EP0646700A2 (en) * 1993-09-30 1995-04-05 Yamaha Hatsudoki Kabushiki Kaisha Pneumatic valve system for internal combustion engine

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1143115A2 (en) * 2000-04-05 2001-10-10 Bayerische Motoren Werke Aktiengesellschaft Return spring arrangement for valve operation of an internal combustion engine
EP1143115A3 (en) * 2000-04-05 2003-01-02 Bayerische Motoren Werke Aktiengesellschaft Return spring arrangement for valve operation of an internal combustion engine
CN106922161A (en) * 2014-11-13 2017-07-04 丰田自动车株式会社 The cylinder head of multiple cylinder engine
CN107002591A (en) * 2014-11-13 2017-08-01 丰田自动车株式会社 The cylinder head of multiple cylinder engine
US20170362992A1 (en) * 2014-11-13 2017-12-21 Toyota Jidosha Kabushiki Kaisha Cylinder head of multi-cylinder engine
CN107002591B (en) * 2014-11-13 2019-11-29 丰田自动车株式会社 The cylinder head of multiple cylinder engine
US10738680B2 (en) 2014-11-13 2020-08-11 Toyota Jidosha Kabushiki Kaisha Cylinder head of multi-cylinder engine
CN110520602A (en) * 2017-01-20 2019-11-29 斗山英维高株式会社 Adapter for engine roller tapper and the engine roller tapper component including the adapter
CN110520602B (en) * 2017-01-20 2021-12-07 斗山英维高株式会社 Adapter for engine roller lifter and engine roller lifter assembly including the same

Also Published As

Publication number Publication date
DE19603536C2 (en) 1999-01-14
DE19603536A1 (en) 1997-08-07
EP0787893B1 (en) 2001-04-04
DE59606719D1 (en) 2001-05-10

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