EP0787893B1 - 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

Info

Publication number
EP0787893B1
EP0787893B1 EP96119256A EP96119256A EP0787893B1 EP 0787893 B1 EP0787893 B1 EP 0787893B1 EP 96119256 A EP96119256 A EP 96119256A EP 96119256 A EP96119256 A EP 96119256A EP 0787893 B1 EP0787893 B1 EP 0787893B1
Authority
EP
European Patent Office
Prior art keywords
closing
cylinder
spring
piston
engine
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 - Lifetime
Application number
EP96119256A
Other languages
German (de)
French (fr)
Other versions
EP0787893A1 (en
Inventor
Ulrich Schulz
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.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke AG
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 Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Publication of EP0787893A1 publication Critical patent/EP0787893A1/en
Application granted granted Critical
Publication of EP0787893B1 publication Critical patent/EP0787893B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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 of DE-A 42 14 839.
  • valve train is designed as a piston / cylinder unit pneumatic closing spring via its cylinder into a recess in the cylinder head the internal combustion engine pressed in to achieve a good derivation of the heat generated when compressing the enclosed gas volume.
  • the cylinder of the closing spring unit with a considerable wall thickness designed to form cooling channels for the passage of lubricating oil draining from the valve train.
  • the invention is based, for a pneumatic closing spring the task of a generic valve train to show a cooling arrangement, at least a heat dissipation effected depending on the machine speed enables.
  • the advantage of the invention is a constant and in particular by the forced cooling Closing spring flushed by the coolant of the machine depending on the speed, the one optionally set in connection with the heat of compression Spring characteristic curve by means of an appropriate coolant supply to the Closing spring is determined.
  • An advantageous embodiment of the invention describes claim 2, according to which 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 be chilled with it. Furthermore, claim 2 includes that of the arrangement the closing spring serving recess over the stroke range of the spring piston extends circumferential groove for a formed with the cylinder coolant-carrying chamber, which is advantageously simple to form.
  • a further development of the invention described in claim 3 is directed to that the cylinder designed as an insert (according to EP application No. 95111924.7) Piston / cylinder unit of the closing spring over the outer circumference with in the above Arranged circumferential groove adjacent machine-side areas Sealing devices interacts.
  • the piston / cylinder unit proposed according to EP application 95111924.7 the pneumatic closing spring is sealed against the environment
  • To be designed as a functional unit during assembly Use its spring function is not due to deformation by essentially a press fit especially geared towards sealing against the coolant are at risk, according to claim 3 with the outer circumference of the insert cylinder cooperating sealing devices proposed on the machine side, whereby an essentially smaller press fit is advantageously possible.
  • claim 4 describes a multi-valve internal combustion engine that Separately arranged cooling chambers outside of their cooling jacket in the cylinder head the closing springs connected by a common channel, the when using the coolant of the internal combustion engine to cool the Closing springs are connected to the cooling jacket.
  • the cooling jacket of the cylinder head can be separated from the closing spring cooling chambers can be optimized, with the design of the channel, for example with constant or variable cross-section over its length the invention Speed-dependent cooling of the closing spring or closing springs can be achieved is.
  • claim 5 describes for separately arranged cooling chambers for the closing springs, the use of a lubricant of the internal combustion engine as Coolant, the cooling chambers of the closing springs in the Lubrication system of the internal combustion engine are arranged.
  • the invention is based on an embodiment shown in the drawing described.
  • a valve train 1 of an internal combustion engine 2, not shown, comprises in one liquid-cooled cylinder head 3 a control shaft 4 for actuating a valve 5 of a gas exchange channel 6.
  • the valve 5 is a pneumatic closing spring 7 assigned, which is designed as a piston / cylinder unit 8 in a machine side Recess 9 is arranged.
  • the cylinder 10 of the unit 8 of the closing spring 7 is in the direction of the control shaft 4 for slidably receiving one with a control cam 11 of the control shaft 4 interacting bucket tappet 12 extends directly onto a shaft 13 of the gas exchange valve 5 acts.
  • Next is in the cylinder 10 with the valve stem 13 drive-connected piston 14 arranged as a movable Completion of a compression chamber 15 of the pneumatic closing spring 7 is used.
  • the compression chamber 15 is connected to a gas-carrying supply line 16 in connection.
  • the closing spring unit formed from cylinder 10 and piston 14 is preferably 8 as one against the subject of EP application 95111924.7 Environmentally sealed single-chamber functional unit designed around this advantageously far from the place of use before installation in the internal combustion engine 2 or in the cylinder head 3 for tightness and function.
  • the closing spring 7 can either face one according to FR-A 2 529 616 the supply line 16 by means of a check valve, not shown lockable compression chamber 15 or according to DE-A 29 49 413 in connection with GB-PS 392 294 one with the supply line 16 via a small throttle bore, not shown, constantly communicating compression chamber 15.
  • the cylinder 10 of the Closing spring 7 via an outer peripheral portion 17 at least in the stroke range of the spring piston 14 with a coolant-carrying chamber 18 of a liquid-cooled Internal combustion engine 2, preferably by a not shown Pump forced cooling is connected.
  • the piston / cylinder unit 8 of the closing spring 7 is preferably in one arranged circulation-cooled cylinder head 3, the arrangement of the Closing spring 7 serving recess 9 over the stroke range of the spring piston 14 extending circumferential groove 19 which with the cylinder 10 a forms coolant-carrying chamber 18.
  • a multi-valve internal combustion engine 2 are outside of their cooling jacket 22 in the cylinder head 3 separately arranged cooling chambers 18 of the closing springs 7 connected by means of a common channel 23, which when using the Coolant of the internal combustion engine 2 for cooling the closing springs 7 with the machine-side cooling jacket 22 is connected.

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 of 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 is designed as a piston / cylinder unit pneumatic closing spring via its cylinder into a recess in the cylinder head the internal combustion engine pressed in to achieve a good derivation 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.Next is to assist heat dissipation for the cylinder of this pneumatic Spring is a material with good thermal conductivity, such as one Copper-beryllium alloy proposed.

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 with a considerable wall thickness designed to form cooling channels for the passage of lubricating oil draining from 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 springs are expensive. These measures appear to be particularly complex with valve-controlled closing springs with minimal gas leakage as well as with one known from DE-A 29 49 413 type of pneumatic closing springs, where the enclosed gas volume at low engine speeds to a certain extent in each case via an open throttle bore a memory space is displaced, but due to high machine speeds the throttling hardly an outflow and thus a temperature effective Gas exchange takes place. This was prevented by the throttle due to the speed Outflow of gas into a storage space closed to the outside or according to GB-PS 392 294 arranged in a in the gas supply line As with a valve-controlled closing spring, the memory results in minimal leakage a speed-dependent change in the closing spring restoring forces considerable amount of compression heat due to insufficient gas exchange. This heat of compression can last longer at higher machine speeds and inadequate heat dissipation to a harder or steeper Spring characteristic of the closing spring with a disadvantageous increase in friction in the Lead 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 is based, for a pneumatic closing spring the task of a generic valve train to show a cooling arrangement, at least a heat dissipation effected depending on the machine speed enables.

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 the unit of the closing spring over an outer peripheral portion at least in Stroke range of the closing spring piston in the cooling jacket of a liquid-cooled Internal combustion engine forced coolant arranged is.

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 constant and in particular by the forced cooling Closing spring flushed by the coolant of the machine depending on the speed, the one optionally set in connection with the heat of compression Spring characteristic curve by means of an appropriate coolant supply to the Closing spring is determined.

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 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 be chilled with it. Furthermore, claim 2 includes that of the arrangement the closing spring serving recess over the stroke range of the spring piston extends circumferential groove for a formed with the cylinder coolant-carrying chamber, 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 that the cylinder designed as an insert (according to EP application No. 95111924.7) Piston / cylinder unit of the closing spring over the outer circumference with in the above Arranged circumferential groove adjacent machine-side areas Sealing devices interacts.

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 proposed according to EP application 95111924.7 the pneumatic closing spring is sealed against the environment One-chamber functional unit designed with the aim of keeping it far from Place of installation before installation in the internal combustion engine for tightness and function to be able to check. To be designed as a functional unit during assembly Use its spring function is not due to deformation by essentially a press fit especially geared towards sealing against the coolant are at risk, according to claim 3 with the outer circumference of the insert cylinder cooperating sealing devices proposed on the machine side, whereby an essentially smaller press fit is advantageously 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 that Separately arranged cooling chambers outside of their cooling jacket in the cylinder head the closing springs connected by a common channel, the when using the coolant of the internal combustion engine to cool the Closing springs are connected to the cooling jacket. With this configuration the cooling jacket of the cylinder head can be separated from the closing spring cooling chambers can be optimized, with the design of the channel, for example with constant or variable cross-section over its length the invention Speed-dependent cooling of the closing spring or closing springs can be achieved is.

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 for separately arranged cooling chambers for the closing springs, the use of a lubricant of the internal combustion engine as Coolant, the cooling chambers of the closing springs in the Lubrication system of the internal combustion engine are arranged.

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

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, comprises in one liquid-cooled cylinder head 3 a control shaft 4 for actuating a valve 5 of a gas exchange channel 6. The valve 5 is a pneumatic closing spring 7 assigned, which is designed as a piston / cylinder unit 8 in a 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 in the direction of the control shaft 4 for slidably receiving one with a control cam 11 of the control shaft 4 interacting bucket tappet 12 extends directly onto a shaft 13 of the gas exchange valve 5 acts. Next is in the cylinder 10 with the valve stem 13 drive-connected piston 14 arranged as a movable Completion of a compression chamber 15 of the pneumatic closing spring 7 is used. The compression chamber 15 is connected to a gas-carrying supply line 16 in connection.

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.The closing spring unit formed from cylinder 10 and piston 14 is preferably 8 as one against the subject of EP application 95111924.7 Environmentally sealed single-chamber functional unit designed around this advantageously far from the place of use before installation in the internal combustion engine 2 or in the cylinder head 3 for tightness and function.

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 face one according to FR-A 2 529 616 the supply line 16 by means of a check valve, not shown lockable compression chamber 15 or according to DE-A 29 49 413 in connection with GB-PS 392 294 one with the 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.To achieve heat dissipation depending on the machine speed or cooling is provided according to the invention that the cylinder 10 of the Closing spring 7 via an outer peripheral portion 17 at least in the stroke range of the spring piston 14 with a coolant-carrying chamber 18 of a liquid-cooled Internal combustion engine 2, preferably by a not shown 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 in one arranged circulation-cooled cylinder head 3, the arrangement of the Closing spring 7 serving recess 9 over the stroke range of the spring piston 14 extending circumferential groove 19 which with the cylinder 10 a forms 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 which as an insert according to the EP Application No. 95111924.7 designed piston / cylinder unit 8 of the Closing spring 7 over the outer circumference with in the circumferential groove 19 or the chamber 18 adjacent areas 20 on the machine or cylinder head side Sealing devices 21 preferably interacts 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 to be 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 are outside of their cooling jacket 22 in the cylinder head 3 separately arranged cooling chambers 18 of the closing springs 7 connected by means of a common channel 23, which when using the Coolant of the internal combustion engine 2 for cooling the closing springs 7 with the machine-side cooling jacket 22 is connected.

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.For heat dissipation from the pneumatic closing spring 7, this is used in the Internal combustion engine 2 circulating coolant, preferably cooling water. Independently of the respective coolant used in the internal combustion engine Closing springs 7 in separately arranged cooling chambers 18 also by means of Lubricating oil of internal combustion engine 2 must be cooled, bearing of control shaft 4 each from a cooling chamber 18 or from the common channel 23 of the cooling chambers 18 are supplied. In this arrangement, the cooling chambers 18 and the channel 23 is 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, the recess 9 according to the single figure around an annular channel 24 be supplemented for collecting and discharging from the compression chamber 15 Lubricating oil applied via a pressure relief valve, not shown.

Claims (5)

  1. A valve drive for internal combustion engines, comprising a pneumatic spring for closing a gas change valve,
    wherein the closing spring (7) disposed in a piston-cylinder unit (8) in a recess (9) on the same side as the engine is cooled by liquid via its cylinder (10), which receives the closing-cylinder piston (14),
    characterised in that
    the cylinder (10) of the closing spring (7), via an outer peripheral portion (17), is disposed so as to be acted upon by a forcibly circulated coolant in the cooling jacket (22) of a liquid-cooled engine (2 or cylinder head 3) at least in the stroke region of the closing-spring piston (14).
  2. A valve drive according to claim 1, characterised in that
    the piston-cylinder unit (8) of the closing spring (7) is disposed in a forced-circulation cooled cylinder head (3), wherein
    the recess (9) for holding the closing spring (7) has a peripheral groove (19) extending over the stroke region of the closing-spring piston (14) for a coolant-conveying chamber (18) formed with the cylinder (10).
  3. A valve drive according to claim 1 or claim 2, characterised in that the cylinder (10) of the piston-cylinder unit (8) of the closing spring (7), in the form of an insert, co-operates via its outer periphery with sealing means (21, O-rings) disposed in regions (20) on the same side as the engine and near the peripheral groove (19) or the chamber (18).
  4. A valve drive according to any of claims 1 to 3, characterised in that
    cooling chambers (18) for a number of closing springs (7) separately disposed in the cylinder head (3) outside the cooling jacket (22) are connected by a common duct (23) which,
    when the coolant of the engine (2) is used, is connected to the coolant (22) of the engine (2) in order to cool the closing springs (7).
  5. A valve drive according to claim 4, characterised in that
    a lubricant of the engine (2) serves as the coolant for the closing spring or springs (7), and
    the cooling chamber or chambers (18) of the closing spring or springs (7) are disposed in the lubricating system of the engine (2) if required.
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

Publications (2)

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

Family

ID=7784206

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96119256A Expired - Lifetime EP0787893B1 (en) 1996-02-01 1996-12-02 Valve drive comprising pneumatic return spring for an internal combustion engine

Country Status (2)

Country Link
EP (1) EP0787893B1 (en)
DE (2) DE19603536C2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Families Citing this family (5)

* 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
DE10016878A1 (en) * 2000-04-05 2001-10-18 Bayerische Motoren Werke Ag Closing spring device for the valve train of a gas exchange valve of an internal combustion engine
JP6390368B2 (en) * 2014-11-13 2018-09-19 トヨタ自動車株式会社 cylinder head
JP6303991B2 (en) * 2014-11-13 2018-04-04 トヨタ自動車株式会社 cylinder head
KR20180085935A (en) * 2017-01-20 2018-07-30 두산인프라코어 주식회사 Adaptor for a roller tappet of an engine and a roller tappet assembly of an engine including the same

Family Cites Families (7)

* 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
CH614014A5 (en) * 1977-01-28 1979-10-31 Sulzer Ag
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
FR2529616B1 (en) 1982-06-30 1987-03-27 Renault Sport PNEUMATIC VALVE RECALL SYSTEM FOR AN INTERNAL COMBUSTION ENGINE
SE455111B (en) * 1986-10-20 1988-06-20 Volvo Ab VALVE SPRING DEVICE WITH SPRING OPERATING BODY
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
JP3484498B2 (en) * 1993-09-30 2004-01-06 ヤマハ発動機株式会社 4 cycle engine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Also Published As

Publication number Publication date
DE19603536C2 (en) 1999-01-14
DE19603536A1 (en) 1997-08-07
EP0787893A1 (en) 1997-08-06
DE59606719D1 (en) 2001-05-10

Similar Documents

Publication Publication Date Title
DE102005009054B4 (en) Cooling arrangement for a cylinder block
CH628399A5 (en) ARRANGEMENT FOR COOLING THE CYLINDER COVER OF A FOUR-STROKE DIESEL ENGINE.
EP2370714B1 (en) Electromagnetic actuating unit
EP0787893B1 (en) Valve drive comprising pneumatic return spring for an internal combustion engine
DE102016120967A1 (en) Length adjustable connecting rod with a cylinder-piston unit with multiple piston seals
DE4214839A1 (en) Valve drive for IC engine - involves lift valve operated in opening direction by cam against force of pneumatic spring
EP0356641B1 (en) Cooling system for the valve seats in the cylinder head of an internal-combustion engine
DE19535920C2 (en) Rotary vane control for an internal combustion engine or a piston pump
EP0806562B1 (en) Cylinderhead for internal combustion engine
DE19739165C2 (en) Internal combustion engine with directly cooled cylinder liner
DE102017212547A1 (en) Reciprocating internal combustion engine
DE102004040781A1 (en) Oil pressure control system and method for engines with hydraulic cylinder deactivation
DE19514918C2 (en) Pistons for internal combustion engines
DE60221471T2 (en) Piston assembly for a free piston internal combustion engine
DE4336920A1 (en) Low friction valve train
DE102010009392A1 (en) Device for the variable adjustment of the timing of gas exchange valves of an internal combustion engine
DE102016100411A1 (en) Hubkolbenvorrichtung and internal combustion engine with such a reciprocating piston device
DE102019101469A1 (en) Reciprocating piston internal combustion engine with piston cooling
EP3311045B1 (en) Piston ring having a groove seal
DE4326366A1 (en) Compressor of swashplate type - has double head piston moved forwards and backwards in cylinder bores and mounted on rotary shaft-fitted swashplate
DE102018206901A1 (en) Cylinder head cover with opening for the implementation and storage of a camshaft of an internal combustion engine and arrangement of a camshaft on such a cylinder head cover
DE2629464A1 (en) MOTOR THROUGH
DE4221921B4 (en) Fuel injection pump for internal combustion engines
DE102019216820B4 (en) Liquid-cooled internal combustion engine with at least one cylinder tube
AT409787B (en) FUEL INJECTION UNIT FOR DIESEL ENGINES

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

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR GB IT

17P Request for examination filed

Effective date: 19980121

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

17Q First examination report despatched

Effective date: 20000523

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

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

ET Fr: translation filed
GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 20010404

REF Corresponds to:

Ref document number: 59606719

Country of ref document: DE

Date of ref document: 20010510

ITF It: translation for a ep patent filed

Owner name: STUDIO JAUMANN P. & C. S.N.C.

REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

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

Ref country code: DE

Payment date: 20141216

Year of fee payment: 19

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 20

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

Ref country code: GB

Payment date: 20151217

Year of fee payment: 20

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

Ref country code: FR

Payment date: 20151228

Year of fee payment: 20

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

Ref country code: IT

Payment date: 20151229

Year of fee payment: 20

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 59606719

Country of ref document: DE

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

Ref country code: DE

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

Effective date: 20160701

REG Reference to a national code

Ref country code: GB

Ref legal event code: PE20

Expiry date: 20161201

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

Ref country code: GB

Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION

Effective date: 20161201