EP0824180B1 - Pneumatic return spring for engine valve - Google Patents

Pneumatic return spring for engine valve Download PDF

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Publication number
EP0824180B1
EP0824180B1 EP97111990A EP97111990A EP0824180B1 EP 0824180 B1 EP0824180 B1 EP 0824180B1 EP 97111990 A EP97111990 A EP 97111990A EP 97111990 A EP97111990 A EP 97111990A EP 0824180 B1 EP0824180 B1 EP 0824180B1
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EP
European Patent Office
Prior art keywords
cylinder
piston
disposed
valve
seal
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Expired - Lifetime
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EP97111990A
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German (de)
French (fr)
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EP0824180A1 (en
Inventor
Ulrich Schulz
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Bayerische Motoren Werke AG
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Bayerische Motoren Werke AG
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Publication of EP0824180A1 publication Critical patent/EP0824180A1/en
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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

Definitions

  • the invention relates to a pneumatic closing spring in the preamble of claim 1 type as known from EP 0 697 540 B1.
  • pneumatic springs also known as air or gas springs
  • air or gas springs are each after their use to maintain a predetermined spring characteristic or to change the spring characteristic with a medium supply and / or discharge effecting device connected.
  • a device can be an air or be gas storage, the respective storage or accumulator by means of charged an additional pressure source or via a separate Pump / compressor is constantly recharged.
  • Exemplary configurations of the type described above for pneumatic closing springs for gas exchange valves of internal combustion engines are from the GB-PS 392 294, DE 38 08 542 C2 and EP 0 536 513 B1.
  • the construction effort and space requirements of each of the known devices for supplying the respective Closing spring with the respective medium is not disadvantageous irrelevant.
  • DE 29 49 413 A1 combines one with a metallic compression spring Pneumatic closing spring for a gas exchange valve known in which a Part of the air compressed during the valve opening stroke via one in both directions free-flowing throttle bore in a storage chamber for speed-dependent Change the air spring characteristic is pumped.
  • AT-PS 322 918 is a self-pumping air suspension element to support relatively heavy loads, especially with wheel suspensions from Motor vehicles known. This includes one in a cylinder via an annular piston guided hollow piston rod, the one between cylinder and hollow piston rod and annular space sealed off by the annular piston via the movements the piston rod serves as a pump, the ambient air compressed in the annular space via a check valve in the one enclosed by the hollow piston rod Work space is introduced.
  • the invention has for its object a generic pneumatic Further develop the closing spring in such a way that the supply to a working chamber a pneumatic medium with minimal construction effort without essential additional space is ensured.
  • This object is achieved with claim 1, with the invention arrangement the pump device via the spring stroke of the pneumatic Closing spring, the pump device advantageously integrated into the closing spring in a compact manner is without significant additional space.
  • This compact Unit is advantageously achieved in that the pump device between an outer cylinder and a piston skirt of the one guided in the cylinder Piston formed annular space, on the one hand via a fixedly arranged Seal the outer boundary of the working chamber of the closing spring limited is and on the other hand via a drive-proof with the piston beyond one connected in the outer cylinder to the annular space provided inlet opening Ring piston, the pump annulus via a channel in the outer cylinder with a pressure controlled opening valve with that of the piston essentially enclosed working chamber is in contact with the medium.
  • this is in the invention Unit integrated valve in an extension of the pump annulus arranged with the working chamber of the spring connecting overflow channel.
  • This configuration advantageously allows the arrangement of the Overflow channel or sections thereof and the expansion in the boundaries the cylinder and its bottom cover.
  • the invention provides the bottom cover of the cylinder with a coaxial to the piston skirt of the piston arranged collar to provide, the sections of the working chamber of the plunging piston limiting collar with the cylinder downstream storage volume upstream of the pump annulus of the working chamber forms.
  • valve receiving Extension of the overflow channel in the bottom of the bottom cover of the cylinder arranged, this extension with a limit, for example of the cylinder by drilling formed channel with the pump annulus communicates.
  • a cooling chamber Via a concentrically arranged on the bottom cover to the piston Collar with one that interacts with the inside of the cylinder Sealing arrangement and with a cooperating with the outside of the piston skirt Sealing arrangement limits this collar with the cylinder a cooling chamber, which has openings in the cylinder, for example, with the Coolant circuit of an internal combustion engine can be connected.
  • this cooling chamber with one in P 196 03 536 stands for a liquid-cooled one Internal combustion engine proposed cooling arrangement in connection.
  • valve arranged between the pump annulus and the working chamber as One-way valve or check valve results from a certain introduced Medium volume that the pressure there is the compression pressure in the Pump annulus corresponds, so that no further gaseous medium over the One-way valve is conveyed to the working chamber.
  • a pneumatic spring 1 is used in an internal combustion engine, not shown as a closing spring for one via a control shaft and an intermediate one Tappet 2 stroke-operated gas exchange valve 3.
  • the plunger 2 is slidably movable in a cylinder 4 of the pneumatic closing spring 1 guided.
  • the closing spring 1 comprises a shaft 5 the gas exchange valve 3 stroke-controlled piston 6 in a compressible Medium containing working chamber 7, and a working chamber 7 via a Valve 8 device 9 supplying pressure to the medium.
  • the invention forms one of the closing spring 1 and the device 9 with a the spring stroke controlled pump device 10 designed a unit 11 self-pumping closing spring 1 for a gas exchange valve 3.
  • the check valve 22 is in the bottom cover side Region of the cylinder 4 arranged in an extension 23 of the channel 21, the extension 23 with the working chamber via a throttle bore 24 connected is.
  • the embodiment of the closing spring 1 shown in FIG. 2 differs of that in Figure 1 by the lack of a storage volume 26 to achieve a working chamber 7 which is larger in volume.
  • the piston 6 points outdoors End portion of his piston skirt 12 beyond the fixed seal 13 a releasably arranged sealing and guide ring 27 for sliding connection with the cylinder 4, the cylinder 4 between the seal 13 and the sealing and guide ring 27 arranged has a ventilation opening 28.
  • This closing spring 1 is also in combination with the spring stroke controlled Pump device 10 of a device supplying the working chamber 7 with medium 9 further developed into a self-pumping spring 1, from the place of use separate check for function and tightness guaranteed without restriction is.
  • the closing spring 1 shown in Figure 3 is further according to the invention Design provided that a in the bottom cover wall area of the cylinder 4 arranged channel 21, the pump annulus 18 with one in the bottom 29 of the bottom cover 14 arranged, serving to accommodate the check valve 22 Extension 23 is connected.
  • the design features further in that on the bottom cover 14 to the piston skirt 12 of the piston 6 Collar 25 arranged concentrically in the free end region of the pump annulus 18 has a delimiting seal arrangement 30 which is in an outer circumferential groove a seal cooperating with the inner circumference of the cylinder 4 31 and in an inner circumferential groove with the outer circumference of the piston skirt 12 cooperating seal 13 includes.
  • this configuration allows the overflow channel 21 as a bore in a radially inwardly thickened wall section of the cylinder 4 and also the annular space between the collar 25 and to use the cylinder 4 as a cooling chamber 32 which has openings 33 in the cylinder 4, for example with a cooling device of the not shown
  • the internal combustion engine is operatively connected, as described in more detail in P 196 03 536 is described.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Check Valves (AREA)
  • Valve Device For Special Equipments (AREA)

Description

Die Erfindung bezieht sich auf eine pneumatische Schließfeder der im Oberbegriff des Patentanspruches 1 beschriebenen Bauart, wie aus EP 0 697 540 B1 bekannt.The invention relates to a pneumatic closing spring in the preamble of claim 1 type as known from EP 0 697 540 B1.

Bekanntlich sind pneumatische Federn, auch als Luft- oder Gasfedern bekannt, sind je nach ihrer Verwendung zur Aufrechterhaltung einer vorgegebenen Federkennlinie oder zur Veränderung der Federkennlinie mit einer die Mediums-Zu- und/oder Abfuhr bewirkenden Vorrichtung verbunden. Eine solche Vorrichtung kann ein Luft- oder Gasspeicher sein, wobei der jeweilige Speicher bzw. Akkumulator mittels einer zusätzlichen Druckquelle aufgeladen oder über eine gesonderte Pumpe/Kompressor ständig nachgeladen ist.Are known pneumatic springs, also known as air or gas springs, are each after their use to maintain a predetermined spring characteristic or to change the spring characteristic with a medium supply and / or discharge effecting device connected. Such a device can be an air or be gas storage, the respective storage or accumulator by means of charged an additional pressure source or via a separate Pump / compressor is constantly recharged.

Beispielhafte Ausgestaltungen der vorbeschriebenen Art für pneumatische SchließFedem für Gaswechselventile von Brennkraftmaschinen sind aus der GB-PS 392 294, der DE 38 08 542 C2 und der EP 0 536 513 B1 bekannt. Der Bauaufwand und Platzbedarf jeder der bekannten Vorrichtungen zur Versorgung der jeweiligen Schließ-Feder mit dem jeweiligen Medium ist in nachteiliger Weise nicht unerheblich. Exemplary configurations of the type described above for pneumatic closing springs for gas exchange valves of internal combustion engines are from the GB-PS 392 294, DE 38 08 542 C2 and EP 0 536 513 B1. The construction effort and space requirements of each of the known devices for supplying the respective Closing spring with the respective medium is not disadvantageous irrelevant.

Weiter ist aus der DE 29 49 413 A1 eine mit einer metallischen Druckfeder kombinierte pneumatische Schließ-Feder für ein Gaswechselventil bekannt, bei der ein Teil der beim Ventilöffnungshub komprimierten Luft über eine in beiden Richtungen frei durchströmte Drosselbohrung in eine Speicherkammer zur drehzahlabhängigen Änderung der Luftfeder-Kennlinie gepumpt ist.Furthermore, DE 29 49 413 A1 combines one with a metallic compression spring Pneumatic closing spring for a gas exchange valve known in which a Part of the air compressed during the valve opening stroke via one in both directions free-flowing throttle bore in a storage chamber for speed-dependent Change the air spring characteristic is pumped.

Schließlich ist aus der AT-PS 322 918 ein selbstpumpendes Luftfederungselement zur Abstützung relativ schwerer Lasten, insbesondere bei Radaufhängungen von Kraftfahrzeugen bekannt. Dieses umfaßt eine in einem Zylinder über einen Ringkolben geführte hohle Kolbenstange, wobei der zwischen Zylinder und hohler Kolbenstange und vom Ringkolben abgeschlossene Ringraum über die Bewegungen der Kolbenstange als Pumpe dient, wobei die im Ringraum verdichtete Umgebungsluft über ein Rückschlagventil in den von der hohlen Kolbenstange umschlossenen Arbeitsraum eingebracht ist.Finally, AT-PS 322 918 is a self-pumping air suspension element to support relatively heavy loads, especially with wheel suspensions from Motor vehicles known. This includes one in a cylinder via an annular piston guided hollow piston rod, the one between cylinder and hollow piston rod and annular space sealed off by the annular piston via the movements the piston rod serves as a pump, the ambient air compressed in the annular space via a check valve in the one enclosed by the hollow piston rod Work space is introduced.

Der Erfindung liegt die Aufgabe zugrunde, eine gattungsgemäße pneumatische Schließfeder derart weiterzubilden, daß die Versorgung einer Arbeitskammer mit einem pneumatischen Medium bei geringstem Bauaufwand ohne wesentlichen zusätzlichen Platzbedarf sichergestellt ist.The invention has for its object a generic pneumatic Further develop the closing spring in such a way that the supply to a working chamber a pneumatic medium with minimal construction effort without essential additional space is ensured.

Diese Aufgabe ist mit dem Patentanspruch 1 gelöst, wobei mit der erfindungsgemäßen Anordnung der Pumpeinrichtung über den Federhub der pneumatischen Schließfeder die Pumpeinrichtung vorteilhaft kleinbauend in der Schließfeder integriert ist ohne wesentlichen zusätzlichen Platzbedarf. Diese kompakte Baueinheit ist vorteilhaft dadurch erreicht, daß die Pumpeinrichtung einen zwischen einem äußeren Zylinder und einem Kolbenhemd des in dem Zylinder geführten Kolbens gebildeten Ringraum umfaßt, der einerseits über eine fest angeordnete Dichtung der äußeren Begrenzung der Arbeitskammer der Schließfeder begrenzt ist und andererseits über einen mit dem Kolben antriebsfest jenseits einer im äußeren Zylinder zum Ringraum vorgesehenen Zuströmöffnung verbundenen Ringkolben, wobei der Pumpen-Ringraum über einen Kanal im äußeren Zylinder mit einem druckgesteuert öffnenden Ventil mit der vom Kolben im wesentlichen umschlossenen Arbeitskammer mediumsführend in Verbindung steht. This object is achieved with claim 1, with the invention arrangement the pump device via the spring stroke of the pneumatic Closing spring, the pump device advantageously integrated into the closing spring in a compact manner is without significant additional space. This compact Unit is advantageously achieved in that the pump device between an outer cylinder and a piston skirt of the one guided in the cylinder Piston formed annular space, on the one hand via a fixedly arranged Seal the outer boundary of the working chamber of the closing spring limited is and on the other hand via a drive-proof with the piston beyond one connected in the outer cylinder to the annular space provided inlet opening Ring piston, the pump annulus via a channel in the outer cylinder with a pressure controlled opening valve with that of the piston essentially enclosed working chamber is in contact with the medium.

Gemäß einer zusätzlichen Ausgestaltung der Erfindung ist das in der erfindungsgemäßen Baueinheit integrierte Ventil in einer Erweiterung des den Pumpen-Ringraum mit der Arbeitskammer der Feder verbindenden Überströmkanals angeordnet. Diese Ausgestaltung ermöglicht in vorteilhafter Weise die Anordnung des Überström-Kanals bzw. Abschnitte davon sowie die Erweiterung in den Begrenzungen des Zylinders sowie seines Bodendeckels vorzusehen.According to an additional embodiment of the invention, this is in the invention Unit integrated valve in an extension of the pump annulus arranged with the working chamber of the spring connecting overflow channel. This configuration advantageously allows the arrangement of the Overflow channel or sections thereof and the expansion in the boundaries the cylinder and its bottom cover.

Gemäß einem ersten, beanspruchten Ausführungsbeispiel sieht die Erfindung vor, den Bodendeckel des Zylinders mit einem zum Kolbenhemd des Kolbens koaxial angeordneten Kragen zu versehen, wobei der abschnittsweise die Arbeitskammer des eintauchenden Kolbens begrenzende Kragen mit dem Zylinder ein stromab des Pumpen-Ringraumes der Arbeitskammer vorgeschaltetes Speichervolumen bildet. Mit dem über eine Drosselbohrung mit der Arbeitskammer verbundenen Speichervolumen sind funktions-nachteilige Druckschwankungen in der Arbeitskammer vermieden.According to a first claimed embodiment, the invention provides the bottom cover of the cylinder with a coaxial to the piston skirt of the piston arranged collar to provide, the sections of the working chamber of the plunging piston limiting collar with the cylinder downstream storage volume upstream of the pump annulus of the working chamber forms. With the one connected to the working chamber via a throttle bore Storage volumes are functionally disadvantageous pressure fluctuations in the working chamber avoided.

Beim zweiten, beanspruchten Ausführungsbeispiel ist der in einem Zylinder gleitbeweglich angeordnete Kolben im freien Endabschnitt seines Kolbenhemdes mit einem lösbar angeordneten Dicht- und Führungsring ausgerüstet. Durch den Fortfall eines Speichervolumens ist eine vergrößerte Arbeitskammer mit einem höheren Kompressionsenddruck erzielt.In the second, claimed embodiment, it is slidable in a cylinder arranged piston in the free end portion of his piston shirt with equipped with a detachable sealing and guide ring. Due to the elimination of a storage volume is an enlarged working chamber with a higher one Compression pressure achieved.

In einem dritten, beanspruchten Ausführungsbeispiel ist die das Ventil aufnehmende Erweiterung des Überström-Kanals im Boden des Bodendeckels des Zylinders angeordnet, wobei diese Erweiterung mit einem beispielsweise in der Begrenzung des Zylinders durch Bohren ausgebildeten Kanal mit dem Pumpen-Ringraum in Verbindung steht. Über einen am Bodendeckel zum Kolben konzentrisch angeordneten Kragen mit einer mit der Innenseite des Zylinders zusammenwirkenden Dichtungsanordnung sowie mit einer mit der Außenseite des Kolbenhemdes zusammenwirkenden Dichtungsanordnung begrenzt dieser Kragen mit dem Zylinder eine Kühlkammer, die über Durchbrechungen im Zylinder beispielsweise mit dem Kühlmittelkreislauf einer Brennkraftmaschine in Verbindung stehen kann. Vorzugsweise steht diese Kühlkammer mit einer in der P 196 03 536 für eine flüssigkeitsgekühlte Brennkraftmaschine vorgeschlagene Kühlanordnung in Verbindung.In a third, claimed embodiment, the valve receiving Extension of the overflow channel in the bottom of the bottom cover of the cylinder arranged, this extension with a limit, for example of the cylinder by drilling formed channel with the pump annulus communicates. Via a concentrically arranged on the bottom cover to the piston Collar with one that interacts with the inside of the cylinder Sealing arrangement and with a cooperating with the outside of the piston skirt Sealing arrangement limits this collar with the cylinder a cooling chamber, which has openings in the cylinder, for example, with the Coolant circuit of an internal combustion engine can be connected. Preferably this cooling chamber with one in P 196 03 536 stands for a liquid-cooled one Internal combustion engine proposed cooling arrangement in connection.

Bei einer Ausgestaltung des in der erfindungsgemäßen Baueinheit integrierten, zwischen dem Pumpen-Ringraum und der Arbeitskammer angeordneten Ventils als Einwegventil bzw. Rückschlagventil ergibt sich ab einem bestimmten eingebrachten Mediumsvolumen, daß der dort befindliche Druck dem Verdichtungsandruck im Pumpen-Ringraum entspricht, so daß kein weiteres gasförmiges Medium über das Einwegventil in die Arbeitskammer gefördert ist. Dies ergibt den überraschenden Vorteil, daß die erfindungsgemäß angeordnete Pumpeinrichtung bei Gleichheit der vorgenannten Drücke als mit der pneumatischen Feder parallel wirkende Zusatzfeder dient.In one configuration of the integrated in the structural unit according to the invention, valve arranged between the pump annulus and the working chamber as One-way valve or check valve results from a certain introduced Medium volume that the pressure there is the compression pressure in the Pump annulus corresponds, so that no further gaseous medium over the One-way valve is conveyed to the working chamber. This results in the surprising Advantage that the pump device arranged according to the invention with the same aforementioned pressures as an additional spring acting in parallel with the pneumatic spring serves.

Aufgrund des Fortfalls der im Stand der Technik bekannten, platz- und bauaufwendigen Versorgungs-Vorrichtungen für in Brennkraftmaschinen als Schließfedern für Gaswechselventile dienende pneumatische Federn können herkömmliche Brennkraftmaschinen vorteilhaft auf erfindungsgemäß gestaltete pneumatische Schließfedem umgerüstet werden.Due to the elimination of the space and construction work known in the prior art Supply devices for closing springs in internal combustion engines Pneumatic springs used for gas exchange valves can be conventional Internal combustion engines advantageously on pneumatic designed according to the invention Closing spring to be converted.

Die Erfindung ist anhand von in der Zeichnung dargestellten, bevorzugten Ausführungsbeispielen beschrieben. Es zeigt:

Figur 1
Eine pneumatische Feder als Schließfeder für ein Gaswechselventil mit einer erfindungsgemäß angeordneten Pumpeinrichtung mit einem der Arbeitskammer vorgeschalteten Speichervolumen,
Figur 2
eine erfindungsgemäße pneumatische Feder als Schließfeder für ein Gaswechselventil mit einer vergrößerten Arbeitskammer durch einen am Kolben im freien Kolbenhemd-Ende lösbar angeordneten Dicht- und Führungsring,
Figur 3
eine erfindungsgemäße pneumatische Feder als Schließfeder für ein Gaswechselventil mit einer die Arbeitskammer abschnittsweise umgebenden Kühlkammer.
The invention is described with reference to preferred exemplary embodiments shown in the drawing. It shows:
Figure 1
A pneumatic spring as a closing spring for a gas exchange valve with an inventive pump device with a storage volume upstream of the working chamber,
Figure 2
a pneumatic spring according to the invention as a closing spring for a gas exchange valve with an enlarged working chamber through a sealing and guide ring detachably arranged on the piston in the free piston skirt end,
Figure 3
a pneumatic spring according to the invention as a closing spring for a gas exchange valve with a cooling chamber surrounding the working chamber in sections.

Eine pneumatische Feder 1 dient in einer nicht dargestellten Brennkraftmaschine als Schließfeder für ein über eine Steuerwelle und einen zwischengeschalteten Stößel 2 hubbetätigtes Gaswechselventil 3. Für einen vorteilhaft einfachen Aufbau ist der Stößel 2 in einem Zylinder 4 der pneumatischen Schließfeder 1 gleitbeweglich geführt. Die Schließfeder 1 umfaßt in dem Zylinder 4 einen über den Schaft 5 des Gaswechselventils 3 hubgesteuerten Kolben 6 in einer ein komprimierbares Medium enthaltenden Arbeitskammer 7, sowie eine die Arbeitskammer 7 über ein Ventil 8 druckgesteuert mit dem Medium versorgende Vorrichtung 9. A pneumatic spring 1 is used in an internal combustion engine, not shown as a closing spring for one via a control shaft and an intermediate one Tappet 2 stroke-operated gas exchange valve 3. For an advantageously simple construction the plunger 2 is slidably movable in a cylinder 4 of the pneumatic closing spring 1 guided. In the cylinder 4, the closing spring 1 comprises a shaft 5 the gas exchange valve 3 stroke-controlled piston 6 in a compressible Medium containing working chamber 7, and a working chamber 7 via a Valve 8 device 9 supplying pressure to the medium.

Erfindungsgemäß bildet eine aus der Schließfeder 1 und der Vorrichtung 9 mit einer über den Federhub gesteuerten Pumpeinrichtung 10 gestaltete Baueinheit 11 eine selbstpumpende Schließfeder 1 für ein Gaswechselventil 3.According to the invention forms one of the closing spring 1 and the device 9 with a the spring stroke controlled pump device 10 designed a unit 11 self-pumping closing spring 1 for a gas exchange valve 3.

Bei der in Figur 1 dargestellten Schließfeder 1 bilden der Zylinder 4 sowie der hubgesteuerte Kolben 6 mit einem Kolbenhemd 12 unter Zwischenschaltung einer Dichtung 13 eine äußere Begrenzung der Arbeitskammer 7, wobei zur Ausgestaltung einer inneren Begrenzung der Arbeitskammer 7 zur Bildung einer gesonderten, gegen die Umgebung dichte Feder 1 am Bodendeckel 14 des Zylinders 4 und am Kolben 6 den Ventilschaft 5 umschließend angeordnete, unter Zwischenschaltung einer weiteren Dichtung 15 miteinander teleskopartig zusammenwirkende Rohrabschnitte 16 und 17 vorgesehen sind. Diese in der EP-A 0 697 540 näher beschriebene Schließfeder 1 kennzeichnet sich dadurch, daß die Pumpeinrichtung 10 einen zwischen dem Zylinder 4 und dem Kolbenhemd 12 des Kolbens 6 gebildeten Ringraum 18 umfaßt, der einerseits über eine fest angeordnete Dichtung 13 der äußeren Begrenzung der Schließfeder begrenzt ist und andererseits über einen mit dem Kolben 6 antriebsfest jenseits einer Zuströmöffnung 19 vorhandenen Ringkolben 20, wobei der Pumpen-Ringraum 18 über einen Kanal 21 mit einem druckgesteuert öffnenden Rückschlagventil 22 mit der Arbeitskammer 7 mediumsführend in Verbindung steht.In the closing spring 1 shown in Figure 1, the cylinder 4 and the stroke-controlled Piston 6 with a piston skirt 12 with the interposition of a Seal 13 an outer boundary of the working chamber 7, being used for configuration an inner boundary of the working chamber 7 to form a separate, against the environment tight spring 1 on the bottom cover 14 of the cylinder 4 and arranged on the piston 6 surrounding the valve stem 5, with interposition a further seal 15 interacting telescopically with one another Pipe sections 16 and 17 are provided. This in more detail in EP-A 0 697 540 Closing spring 1 described is characterized in that the Pump device 10 a between the cylinder 4 and the piston skirt 12 of the Piston 6 formed annular space 18 which on the one hand via a fixed Seal 13 of the outer limit of the closing spring is limited and on the other hand via a drive fixed with the piston 6 beyond an inflow opening 19 existing annular piston 20, the pump annulus 18 via a channel 21 with a pressure-controlled check valve 22 with the working chamber 7 is in contact with the medium.

Wie aus der Figur 1 weiter ersichtlich, ist das Rückschlagventil 22 im bodendeckelseitigen Bereich des Zylinders 4 in einer Erweiterung 23 des Kanals 21 angeordnet, wobei die Erweiterung 23 mit der Arbeitskammer über eine Drosselbohrung 24 verbunden ist.As can also be seen from FIG. 1, the check valve 22 is in the bottom cover side Region of the cylinder 4 arranged in an extension 23 of the channel 21, the extension 23 with the working chamber via a throttle bore 24 connected is.

Weiter zeigt die Figur 1, daß das Kolbenhemd 12 des hubgesteuerten Kolbens 6 in einen am Bodendeckel 14 des Zylinders 4 angeordneten, konzentrischen Kragen 25 eintaucht, der pumpenringraumseitig die fest angeordnete Dichtung 13 der äußeren Begrenzung der Feder 1 trägt. Ferner begrenzt der dünnwandig gestaltete Kragen 25 mit einem bodendeckelseitigen Abschnitt des Zylinders 4 ein ringförmiges Speichervolumen 26 zwischen Pumpen-Ringraum 18 und Arbeitskammer 7, wobei das mit dem Ringraum 18 druckgesteuert verbundene Speichervolumen 26 über die Drosselbohrung 24 mit der Arbeitskammer 7 in Verbindung steht. 1 shows that the piston skirt 12 of the stroke-controlled piston 6 in a concentric collar arranged on the bottom cover 14 of the cylinder 4 25 immersed, the fixed ring seal 13 of the pump annulus side outer boundary of the spring 1 carries. Furthermore, the thin-walled design limits Collar 25 with a bottom cover portion of the cylinder 4 an annular Storage volume 26 between pump annulus 18 and working chamber 7, wherein the storage volume 26 connected to the annular space 18 under pressure control communicates with the working chamber 7 via the throttle bore 24.

Mit der Erfindung ist die in Figur 1 als eine Funktionseinheit in einer gegen die Umgebung dicht abgeschlossenen Ein-Kammer-Bauart dargestellte Schließfeder 1 auf baulich einfache Art zu einer selbstpumpenden Feder 1 weitergebildet, ohne daß bei einer vom Einsatzort der Schließfeder 1 gesonderten Überprüfung auf Funktion und Dichtheit eine Beschränkung hinzunehmen ist.With the invention is that in Figure 1 as a functional unit in one against the environment tightly closed single-chamber design shown closing spring 1 structurally simple type to a self-pumping spring 1 without in a separate check of the function of the location of the closing spring 1 and tightness is a limitation.

Das in Figur 2 gezeigte Ausführungsbeispiel der Schließfeder 1 unterscheidet sich von der in Figur 1 durch das Fehlen eines Speichervolumens 26 zur Erzielung einer im Volumen größeren Arbeitskammer 7. Hierfür weist der Kolben 6 im freien Endabschnitt seines Kolbenhemdes 12 jenseits der fest angeordneten Dichtung 13 einen lösbar angeordneten Dicht- und Führungsring 27 zur gleitbeweglichen Verbindung mit dem Zylinder 4 auf, wobei der Zylinder 4 zwischen der Dichtung 13 und dem Dicht- und Führungsring 27 angeordnet eine Belüftungsöffnung 28 aufweist. Auch diese Schließfeder 1 ist in Kombination mit der Federhub-gesteuerten Pumpeinrichtung 10 einer die Arbeitskammer 7 mit Medium versorgenden Vorrichtung 9 zu einer selbstpumpenden Feder 1 weitergebildet, deren vom Einsatzort gesonderte Überprüfung auf Funktion und Dichtheit ohne einer Beschränkung gewährleistet ist.The embodiment of the closing spring 1 shown in FIG. 2 differs of that in Figure 1 by the lack of a storage volume 26 to achieve a working chamber 7 which is larger in volume. For this purpose, the piston 6 points outdoors End portion of his piston skirt 12 beyond the fixed seal 13 a releasably arranged sealing and guide ring 27 for sliding connection with the cylinder 4, the cylinder 4 between the seal 13 and the sealing and guide ring 27 arranged has a ventilation opening 28. This closing spring 1 is also in combination with the spring stroke controlled Pump device 10 of a device supplying the working chamber 7 with medium 9 further developed into a self-pumping spring 1, from the place of use separate check for function and tightness guaranteed without restriction is.

Bei der in Figur 3 dargestellten Schließfeder 1 ist in weiterer erfindungsgemäßer Ausgestaltung vorgesehen, daß ein im bodendeckelseitigen Wandbereich des Zylinders 4 angeordneter Kanal 21 den Pumpen-Ringraum 18 mit einer im Boden 29 des Bodendeckels 14 angeordneten, der Aufnahme des Rückschlagventils 22 dienenden Erweiterung 23 in Verbindung steht. Die Ausgestaltung kennzeichnet sich weiter dadurch, daß ein am Bodendeckel 14 zum Kolbenhemd 12 des Kolbens 6 konzentrisch angeordneter Kragen 25 im freien Endbereich eine den Pumpen-Ringraum 18 begrenzende Dichtungsanordnung 30 aufweist, die in einer Außenumfangsnut eine mit dem Innenumfang des Zylinders 4 zusammenwirkende Dichtung 31 sowie in einer Innenumfangsnut die mit dem Außenumfang des Kolbenhemdes 12 zusammenwirkende Dichtung 13 umfaßt.In the closing spring 1 shown in Figure 3 is further according to the invention Design provided that a in the bottom cover wall area of the cylinder 4 arranged channel 21, the pump annulus 18 with one in the bottom 29 of the bottom cover 14 arranged, serving to accommodate the check valve 22 Extension 23 is connected. The design features further in that on the bottom cover 14 to the piston skirt 12 of the piston 6 Collar 25 arranged concentrically in the free end region of the pump annulus 18 has a delimiting seal arrangement 30 which is in an outer circumferential groove a seal cooperating with the inner circumference of the cylinder 4 31 and in an inner circumferential groove with the outer circumference of the piston skirt 12 cooperating seal 13 includes.

Diese erfindungsgemäße Ausgestaltung erlaubt es zum einen, den Überströmkanal 21 als eine Bohrung in einem radial nach innen verdickten Wandabschnitt des Zylinders 4 auszubilden und ferner den Ringraum zwischen dem Kragen 25 und dem Zylinder 4 als eine Kühlkammer 32 zu nutzen, die über Durchbrechungen 33 im Zylinder 4 beispielsweise mit einer Kühleinrichtung der nicht dargestellten Brennkraftmaschine in Wirkverbindung steht, wie dies in der P 196 03 536 näher beschrieben ist.On the one hand, this configuration according to the invention allows the overflow channel 21 as a bore in a radially inwardly thickened wall section of the cylinder 4 and also the annular space between the collar 25 and to use the cylinder 4 as a cooling chamber 32 which has openings 33 in the cylinder 4, for example with a cooling device of the not shown The internal combustion engine is operatively connected, as described in more detail in P 196 03 536 is described.

Claims (6)

  1. A pneumatic spring for closing a gas change valve of an internal combustion engine,
    wherein a cylinder (4) and the shell (12) of a piston (6) actuated by a shank (5) of the gas change valve (3) via a push rod (2) operating under the control of the stroke and disposed in the cylinder (4) form an outer boundary, with interposition of a seal, of a working chamber (7) containing a compressible medium, wherein
    telescopically co-operating tube portions (16, 17) surrounding the valve shank (5) and disposed on the piston (6) and on a base cover (14) of the cylinder (4), with interposition of an additional seal (15), form an inner boundary of the working chamber (7), and
    the medium under pressure control can be supplied to the working chamber (7) via a valve (8, 22),
    characterised in that
    a pump device (10) controlled by the stroke of the closing spring (1) comprises an annular chamber (18) defined by an annular piston (20) disposed on the piston (6) between, firstly, the cylinder (4) and the piston shell (12) and, secondly, a fixed seal (13) on the outer boundary of the working chamber (7) and the annular piston (20) which in the initial stroke region is on the other side of an inflow opening (19) in the cylinder (4), wherein
    the annular pump chamber (18), for the purpose of conveying medium, is connected via a duct (21) in the outer cylinder (4) and via a valve (8, 22) opening under pressure control to the working chamber (7) substantially surrounded by the piston (6).
  2. A closing spring according to claim 1, characterised in that
    the valve (8) or the non-return valve (22) is disposed in the base cover-side region of the cylinder (4) in a wide portion (23) of the duct (21), wherein
    the wide portion (23) is connected to the working chamber (7) via a choke bore (24) (Figures 1 to 3).
  3. A closing spring according to claims 1 and 2, characterised in that
    the shell (12) of the stroke-controlled piston (6) plunges into a collar (25) disposed on the base cover (14) of the cylinder (4),
    on the same side as the annular pump chamber, the collar bears the fixed seal (13) of the outer boundary of the closing spring (1), and
    the thin-walled collar (25) co-operates with a base cover-side portion of the cylinder (4) to bound an annular reservoir space (26) between the annular pump chamber (18) and the working chamber (7), by means of which
    the reservoir space (26) connected under pressure control to the annular chamber (18) is connected to the choke bore (24), (Figure 1).
  4. A closing spring according to claims 1 and 2, characterised in that
    the piston (6) in the free end portion of its shell (12), on the other side of the fixed seal (13), comprises a releasably disposed sealing and guiding ring (27) for slidably connecting to the cylinder (4) wherein
    the cylinder (4) has a vent opening (28) disposed between the seal (13) and the sealing and guiding ring (27) (Figure 2).
  5. A closing spring according to claims 1 and 2, characterised in that
    a duct (21) disposed in the base cover-side wall region of the cylinder (4) connects the annular pump chamber (18) to a wide portion (23) disposed at the bottom (29) of the base cover (14) and serving to receive the valve (8) or the non-return valve (22), and
    at its free end region, a collar (25) disposed concentrically with the shell (12) of the piston (6) on the base cover (14) has a sealing arrangement (30) which bounds the annular pump chamber (18), and
    the seal arrangement comprises a seal (31) in an outer peripheral groove co-operating with the inner periphery of the cylinder (4) and a seal (13) co-operating in an inner periphery groove with the outer periphery of the piston shell (12) (Figure 3).
  6. A closing spring according to claim 5, characterised in that
    the collar (25) and the cylinder (4) bound a cooling chamber (32), which
    is supplied with a cooling medium through apertures (33) in the cylinder (4) (Figure 3).
EP97111990A 1996-08-13 1997-07-15 Pneumatic return spring for engine valve Expired - Lifetime EP0824180B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19632628A DE19632628A1 (en) 1996-08-13 1996-08-13 Pneumatic spring, in particular closing spring for a gas exchange valve of an internal combustion engine
DE19632628 1996-08-13

Publications (2)

Publication Number Publication Date
EP0824180A1 EP0824180A1 (en) 1998-02-18
EP0824180B1 true EP0824180B1 (en) 2001-05-30

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ID=7802535

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97111990A Expired - Lifetime EP0824180B1 (en) 1996-08-13 1997-07-15 Pneumatic return spring for engine valve

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EP (1) EP0824180B1 (en)
DE (2) DE19632628A1 (en)
ES (1) ES2158411T3 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8375902B2 (en) 2009-01-22 2013-02-19 Brp-Powertrain Gmbh & Co. Kg Air spring with cap
US8550044B2 (en) 2009-01-20 2013-10-08 Brp-Powertrain Gmbh & Co. Kg Air spring system for an internal combustion engine

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
DE10207038A1 (en) * 2002-02-20 2003-08-21 Bayerische Motoren Werke Ag Valve operating drive has gas supply to gas cavity downstream of gas inlet aperture through at least one gap between housing and piston
SE540998C2 (en) 2014-04-17 2019-02-26 Freevalve Ab Combustion engine with pneumatic valve spring

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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
DE1143398B (en) * 1955-10-31 1963-02-07 Adalbert Freyler Pneumatic telescopic suspension, especially for motor vehicles
AT322918B (en) * 1973-01-03 1975-06-10 Cerny Anton Jun Fa SELF-LOADING, ADJUSTABLE AIR SUSPENSION ELEMENT
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
DE3020050C2 (en) * 1980-05-24 1984-11-15 Boge Gmbh, 5208 Eitorf Self-pumping hydropneumatic suspension with level control for vehicles
DE3808542C2 (en) 1987-03-26 1994-03-24 Volkswagen Ag Valve train for a gas exchange valve of an internal combustion engine
DE69211942T2 (en) 1991-08-21 1996-10-31 Honda Motor Co Ltd Lift valve control device for internal combustion engines
JPH06272521A (en) * 1993-03-19 1994-09-27 Mazda Motor Corp Valve system of internal combustion engine
EP0697540B1 (en) * 1994-08-12 1999-09-29 Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 Pneumatic spring, especially for the gas exchange valves of internal combustion engines
DE19603536C2 (en) 1996-02-01 1999-01-14 Bayerische Motoren Werke Ag Valve train for an internal combustion engine with a pneumatic closing spring for a gas exchange valve

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8550044B2 (en) 2009-01-20 2013-10-08 Brp-Powertrain Gmbh & Co. Kg Air spring system for an internal combustion engine
US8813697B2 (en) 2009-01-20 2014-08-26 Brp-Powertrain Gmbh & Co. Kg Air spring system for an internal combustion engine
US8375902B2 (en) 2009-01-22 2013-02-19 Brp-Powertrain Gmbh & Co. Kg Air spring with cap

Also Published As

Publication number Publication date
ES2158411T3 (en) 2001-09-01
EP0824180A1 (en) 1998-02-18
DE59703651D1 (en) 2001-07-05
DE19632628A1 (en) 1998-02-19

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