EP0628701A1 - Sealing arrangement for internal combustion engine valve stem - Google Patents

Sealing arrangement for internal combustion engine valve stem Download PDF

Info

Publication number
EP0628701A1
EP0628701A1 EP94400923A EP94400923A EP0628701A1 EP 0628701 A1 EP0628701 A1 EP 0628701A1 EP 94400923 A EP94400923 A EP 94400923A EP 94400923 A EP94400923 A EP 94400923A EP 0628701 A1 EP0628701 A1 EP 0628701A1
Authority
EP
European Patent Office
Prior art keywords
valve
volume
pipe
pressure
internal combustion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP94400923A
Other languages
German (de)
French (fr)
Other versions
EP0628701B1 (en
Inventor
Stéphane Venturi
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.)
IFP Energies Nouvelles IFPEN
Original Assignee
IFP Energies Nouvelles IFPEN
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 IFP Energies Nouvelles IFPEN filed Critical IFP Energies Nouvelles IFPEN
Publication of EP0628701A1 publication Critical patent/EP0628701A1/en
Application granted granted Critical
Publication of EP0628701B1 publication Critical patent/EP0628701B1/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
    • F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F01L3/08—Valves guides; Sealing of valve stem, e.g. sealing by lubricant

Definitions

  • the present invention relates to the field of internal combustion engines having at least one cylinder and each combustion chamber of which is supplied with a fuel mixture under pressure via an intake pipe which is itself closed, on the combustion chamber side, by a valve, the movement of each valve being controlled by a cam.
  • the invention provides a sealing device for the valve stem, intended to prevent fuel from leaking from the intake channel to the housing containing the cam (s).
  • valve stems by means of a seal surrounding the valve stem and arranged for example on a member for guiding the valve stem.
  • the seals thus used may wear out, be damaged by the very movement of the valve, temperatures, so that their sealing function is no longer (or is poorly) fulfilled after a certain period of operation. .
  • the present invention in particular provides a solution to the aforementioned sealing problem.
  • the subject of the present invention is a sealing device intended to prevent the leaks defined above.
  • the sealing device according to the invention can replace or add to a conventional sealing device.
  • the sealing device according to the invention is based on the use of a back pressure.
  • the back pressure used according to the present invention essentially has a sealing function between two volumes.
  • the displacement of each valve is achieved by means of a cam or equivalent means.
  • the two functions, displacement and sealing, do not interfere in any way between them since the displacement is obtained by mechanical means while the sealing is carried out by essentially pneumatic means of a different physical nature.
  • the system according to the present invention is simple, easy to implement, and therefore reliable.
  • valve the valve seat
  • valve stem the valve stem
  • intake duct the intake duct
  • cams the cam box
  • the present invention aims in particular to improve one of the functions linked to the injection of fuel into the combustion chamber.
  • the present invention relates to a sealing device for a valve stem controlled by a cam contained in a camshaft housing of an internal combustion engine having at least one cylinder.
  • the sealing device comprises a pipe connecting on the one hand an inlet pipe for the fuel mixture into a combustion chamber, closed by a valve, and on the other hand a camshaft housing , and a non-return valve placed in said pipe in order to separate said pipe into two volumes, the first volume being connected to the housing and constituting a pressurized capacity having a pressure P1 greater than or equal to the pressure P2 prevailing in the pipeline. intake and in the second volume, said device being intended to prevent fuel leaks from the intake pipe to the camshaft housing.
  • the second volume is connected to a pump housing of a cylinder of the internal combustion engine.
  • the second volume is connected to a compressor external to the cylinder.
  • the intake pipe is supplied with compressed air and it comprises a pneumatic fuel injector so that said valve acts as a pneumatic injector to spray said fuel into the combustion chamber.
  • the reference 1 indicates the combustion chamber
  • the intake channel bears the reference 2
  • a cam is referenced 3
  • the cam box is referenced 4
  • the valve 5 comprises, on the combustion chamber side 1, a tulip 51 closing the intake orifice 6 and resting on a seat (not referenced);
  • the valve 5 also comprises a rod (or tail) 52 extending the tulip 51 and guided in translation by a guide or equivalent means 7;
  • an elastic return element 8 pushes the valve 5 against the cam 3, which tends to bring the tulip 51 back onto its seat, that is to say to close the orifice 6.
  • the cam 3 on the contrary pushes the valve 5 into the other direction, tending to open port 6.
  • a sealing element 9 such as a seal can be provided for example at the level of the return element 8 in order to ensure a first seal between the intake channel 2 and the cam box 4.
  • the fluid under pressure circulating in channel 2 may for example comprise a mixture of air and fuel; the fuel can be caused to accumulate along the stem of the valve 52, to infiltrate beyond the sealing element 9.
  • the element 9 is particularly effective in preventing leaks in the direction of camshaft 4 towards the conduit 2 but is however very ineffective in preventing leaks in the direction of conduit 2 towards the camshaft 9. This last function is the one for which efficiency is sought according to the invention.
  • the present invention therefore proposes another sealing device, which, as has already been said, can be substitute or add for example to a known sealing device 9.
  • the sealing device notably comprises a pipe 10 connecting the intake pipe 2 to the cam box 4.
  • the valve 11 therefore makes it possible to separate the pipe 10 into two volumes: the first volume 12 in connection with the cam box 4, the second volume 13 communicating with the intake pipe 2.
  • the first volume 12 there is a pressure P1 while that in the second volume 13 there is a pressure P2.
  • the valve 11 opens when the pressure P2 is greater than the pressure P1, thus making the volume 12 play the role of a pressure storage capacity.
  • the volume 12 is in fact almost nonexistent, so that the pressure P1 is the pressure in the cam box 4.
  • FIG. 2 illustrates an embodiment in which the volume 12 appears clearly.
  • FIGS. 1 and 2 differ in particular in the place where the conduit 10 opens:
  • the duct 10 opens out towards the combustion chamber 1 near the intake orifice 6, while in FIG. 2 the tapping is more upstream.
  • Line 2 can convey, for example, a fluid having the pressure of the pump housing, a pressure which of course varies during each engine cycle.
  • the non-return valve 11 therefore makes it possible to store in the volume 12 and in the space 4 the maximum pressure P1 obtained during each cycle. This pressure will oppose, in particular at the level of the stem 52 of the valve 5, the pressure P2 which prevails near the inlet orifice 6 and which is necessarily less than or at most equal to P1.
  • the valve 5 can be used to carry out a pneumatic injection of fuel into the combustion chamber 1, from compressed air taken, for example, from the pump housing of a two-stroke engine.
  • the compressed air can be supplied by a compressor external to the cylinder.
  • a fuel introduction member (not visible in the figures) can be provided; it can open into the intake pipe 2, so that the valve then performs a pneumatic fuel injection function in the combustion chamber.

Abstract

The subject of the present invention is a sealing device for a valve stem controlled by a cam contained in a camshaft casing of an internal combustion engine having at least one cylinder. The device according to the invention includes a duct (10) connecting, on the one hand, a pipe (2) for the intake of the carburated fuel into a combustion chamber (1) this pipe being closed off by a valve (5) and, on the other hand, a camshaft casing (4). A non-return valve (11) is placed in the said duct (10) so as to divide the said duct (10) into two volumes (12, 13), the first volume (12) being connected to the casing (4) and constituting a pressurised capacity which has a pressure P1 greater than or equal to the pressure P2 prevailing in the intake pipe (2) and in the second volume (13). The device according to the invention is intended to prevent oxidising air from leaking from the intake pipe (2) into the camshaft casing (4). <IMAGE>

Description

La présente invention a trait au domaine des moteurs à combustion interne ayant au moins un cylindre et dont chaque chambre de combustion est alimentée en mélange carburé sous pression via une canalisation d'admission elle-même obturée, coté chambre de combustion, par une soupape, le mouvement de chaque soupape étant commandé par une came.The present invention relates to the field of internal combustion engines having at least one cylinder and each combustion chamber of which is supplied with a fuel mixture under pressure via an intake pipe which is itself closed, on the combustion chamber side, by a valve, the movement of each valve being controlled by a cam.

Plus précisément l'invention fournit un dispositif d'étanchéité pour queue de soupape, destiné à éviter les fuites de carburant du canal d'admission vers le boîtier renfermant la ou les cames.More precisely, the invention provides a sealing device for the valve stem, intended to prevent fuel from leaking from the intake channel to the housing containing the cam (s).

On cherche à éviter de telles fuites car elles contribuent notamment à l'encrassement de la boîte à cames et à une détérioration de l'huile contenue dans la boîte à cames.We try to avoid such leaks because they contribute in particular to the fouling of the cam box and to a deterioration of the oil contained in the cam box.

Il est connu de réaliser l'étanchéité des queues de soupape grâce à un joint entourant la queue de soupape et disposé par exemple sur un élément de guidage de la queue de la soupape.It is known to seal the valve stems by means of a seal surrounding the valve stem and arranged for example on a member for guiding the valve stem.

Les joints ainsi utilisés peuvent s'user, s'abîmer sous l'effet du mouvement même de la soupape, des températures, de sorte que leur fonction d'étanchéité n'est plus (ou est mal) remplie après un certain temps de fonctionnement.The seals thus used may wear out, be damaged by the very movement of the valve, temperatures, so that their sealing function is no longer (or is poorly) fulfilled after a certain period of operation. .

La présente invention propose notamment une solution au problème d'étanchéité précité.The present invention in particular provides a solution to the aforementioned sealing problem.

En effet la présente invention a pour objet un dispositif d'étanchéité destiné à éviter les fuites définies ci-dessus.Indeed, the subject of the present invention is a sealing device intended to prevent the leaks defined above.

Le dispositif d'étanchéité selon l'invention peut se substituer ou s'ajouter à un dispositif d'étanchéité classique.The sealing device according to the invention can replace or add to a conventional sealing device.

Le dispositif d'étanchéité conforme à l'invention repose sur l'utilisation d'une contrepression.The sealing device according to the invention is based on the use of a back pressure.

Il est connu d'utiliser une contrepression ou une pression additionnelle pour assister le mouvement même de la soupape. Par exemple les document US 1 361 109 ou FR 2 641 336 divulguent des dispositifs d'aide au déplacement d'une soupape grâce à une différence de pression entre deux volumes.It is known to use additional pressure or pressure to assist the movement of the valve itself. For example, documents US 1,361,109 or FR 2,641,336 disclose devices for assisting the movement of a valve by virtue of a pressure difference between two volumes.

De façon différente, la contrepression utilisée selon la présente invention a essentiellement une fonction d'étanchéité entre deux volumes. En effet, selon la présente invention le déplacement de chaque soupape est réalisé grâce à une came ou moyen équivalent. Les deux fonctions, déplacement et étanchéité, n'interfèrent nullement entre elles puisque le déplacement est obtenu par des moyens mécaniques tandis que l'étanchéité est réalisée par des moyens essentiellement pneumatiques d'une nature physique différente.In a different way, the back pressure used according to the present invention essentially has a sealing function between two volumes. According to the present invention, the displacement of each valve is achieved by means of a cam or equivalent means. The two functions, displacement and sealing, do not interfere in any way between them since the displacement is obtained by mechanical means while the sealing is carried out by essentially pneumatic means of a different physical nature.

Le système selon la présente invention est simple, facile à mettre en oeuvre, donc fiable.The system according to the present invention is simple, easy to implement, and therefore reliable.

Il ne nécessite aucune transformation particulièrement importante des éléments essentiels classiques du système d'admission: la soupape (le siège de la soupape), la queue de la soupape, le conduit d'admission, les cames, la boîte à came ne sont nullement modifiés ; leur fonctions respectives, éprouvées et connues depuis longtemps, restent donc inchangées.It does not require any particularly significant transformation of the classic essential elements of the intake system: the valve (the valve seat), the valve stem, the intake duct, the cams, the cam box are in no way modified. ; their respective functions, proven and known for a long time, therefore remain unchanged.

La présente invention vise notamment à améliorer l'une des fonctions liée à l'injection de carburant dans la chambre de combustion.The present invention aims in particular to improve one of the functions linked to the injection of fuel into the combustion chamber.

Pour ce faire, la présente invention a pour objet un dispositif d'étanchéité pour queue de soupape commandée par une came contenue dans un boîtier d'arbre à came d'un moteur à combustion interne ayant au moins un cylindre.To do this, the present invention relates to a sealing device for a valve stem controlled by a cam contained in a camshaft housing of an internal combustion engine having at least one cylinder.

Conformément à l'invention, le dispositif d'étanchéité comporte une conduite reliant d'une part une canalisation d'admission du mélange carburé dans une chambre de combustion, obturée par une soupape, et d'autre part un boîtier d'arbre à cames, et un clapet anti-retour placé dans ladite conduite afin de séparer ladite conduite en deux volumes, le premier volume étant relié au boîtier et constituant une capacité sous pression ayant une pression P1 supérieure ou égale à la pression P2 régnant dans la canalisation d'admission et dans le deuxième volume, ledit dispositif étant destiné à éviter les fuites de carburant de la canalisation d'admission vers le boîtier d'arbre à cames.According to the invention, the sealing device comprises a pipe connecting on the one hand an inlet pipe for the fuel mixture into a combustion chamber, closed by a valve, and on the other hand a camshaft housing , and a non-return valve placed in said pipe in order to separate said pipe into two volumes, the first volume being connected to the housing and constituting a pressurized capacity having a pressure P1 greater than or equal to the pressure P2 prevailing in the pipeline. intake and in the second volume, said device being intended to prevent fuel leaks from the intake pipe to the camshaft housing.

Selon un mode de réalisation de l'invention le deuxième volume est relié à un carter-pompe d'un cylindre du moteur à combustion interne.According to one embodiment of the invention, the second volume is connected to a pump housing of a cylinder of the internal combustion engine.

Selon un autre mode de réalisation de l'invention le deuxième volume est relié à un compresseur extérieur au cylindre.According to another embodiment of the invention, the second volume is connected to a compressor external to the cylinder.

Conformément à un mode particulier de réalisation de l'invention, la canalisation d'admission est alimentée en air comprimé et elle comporte un injecteur pneumatique en carburant de sorte que ladite soupape agit en tant qu'injecteur pneumatique pour pulvériser ledit carburant dans la chambre de combustion.According to a particular embodiment of the invention, the intake pipe is supplied with compressed air and it comprises a pneumatic fuel injector so that said valve acts as a pneumatic injector to spray said fuel into the combustion chamber.

L'invention sera mieux comprise, d'autres détails et améliorations apparaîtront mieux à la lecture de la description qui va suivre faite à titre illustratif et nullement limitatif, en référence aux dessins annexés sur lesquels :

  • La figure 1 représente schématiquement une partie d'un moteur comportant un dispositif d'étanchéité selon un mode de réalisation de l'invention ; et
  • La figure 2 représente schématiquement une partie d'un moteur comportant un dispositif d'étanchéité selon un autre mode de revendication de l'invention.
The invention will be better understood, other details and improvements will appear better on reading the description which follows, given by way of illustration and in no way limiting, with reference to the appended drawings in which:
  • FIG. 1 schematically represents a part of an engine comprising a sealing device according to an embodiment of the invention; and
  • FIG. 2 schematically represents a part of an engine comprising a sealing device according to another mode of claim of the invention.

Sur la figure 1, la référence 1 indique la chambre de combustion, le canal d'admission porte la référence 2, une came est référencée 3, la boîte à came est référencée 4 ; la soupape 5 comporte, coté chambre de combustion 1, une tulipe 51 obturant l'orifice d'admission 6 et reposant sur un siège (non référencé) ; la soupape 5 comporte par ailleurs une tige (ou queue) 52 prolongeant la tulipe 51 et guidée en translation par un guide ou moyen équivalent 7 ; un élément élastique de rappel 8 pousse la soupape 5 contre la came 3, ce qui tend à ramener la tulipe 51 sur son siège c'est-à-dire à obturer l'orifice 6. La came 3 au contraire pousse la soupape 5 dans l'autre sens, tendant à ouvrir l'orifice 6.In FIG. 1, the reference 1 indicates the combustion chamber, the intake channel bears the reference 2, a cam is referenced 3, the cam box is referenced 4; the valve 5 comprises, on the combustion chamber side 1, a tulip 51 closing the intake orifice 6 and resting on a seat (not referenced); the valve 5 also comprises a rod (or tail) 52 extending the tulip 51 and guided in translation by a guide or equivalent means 7; an elastic return element 8 pushes the valve 5 against the cam 3, which tends to bring the tulip 51 back onto its seat, that is to say to close the orifice 6. The cam 3 on the contrary pushes the valve 5 into the other direction, tending to open port 6.

Un élément d'étanchéité 9 tel un joint peut être prévu par exemple au niveau de l'élément de rappel 8 afin d'assurer une première étanchéité entre le canal d'admission 2 et la boîte à cames 4. Le fluide sous pression circulant dans le canal 2 peut comprendre par exemple un mélange d'air et de carburant ; le carburant peut être amené à s'accumuler le long de la queue de la soupape 52, à s'infiltrer au-delà de l'élément d'étanchéité 9.A sealing element 9 such as a seal can be provided for example at the level of the return element 8 in order to ensure a first seal between the intake channel 2 and the cam box 4. The fluid under pressure circulating in channel 2 may for example comprise a mixture of air and fuel; the fuel can be caused to accumulate along the stem of the valve 52, to infiltrate beyond the sealing element 9.

De façon connue, l'élément 9 est particulièrement efficace pour empêcher des fuites dans le sens boîte à cames 4 vers le conduit 2 mais est en revanche très peu efficace pour empêcher des fuites dans le sens du conduit 2 vers la boîte à cames 9. Cette dernière fonction est celle pour laquelle l'efficacité est recherchée suivant l'invention.In known manner, the element 9 is particularly effective in preventing leaks in the direction of camshaft 4 towards the conduit 2 but is however very ineffective in preventing leaks in the direction of conduit 2 towards the camshaft 9. This last function is the one for which efficiency is sought according to the invention.

Fort de cette constatation, la présente invention propose donc un autre dispositif d'étanchéité, qui comme il a déjà été dit, peut se substituer ou s'ajouter par exemple à un dispositif d'étanchéité 9 connu.On the strength of this observation, the present invention therefore proposes another sealing device, which, as has already been said, can be substitute or add for example to a known sealing device 9.

Le dispositif d'étanchéité selon l'invention comporte notamment une conduite 10 reliant la canalisation d'admission 2 à la boîte à came 4. Un clapet anti-retour 11 ou tout autre moyen destiné à laisser passer le fluide sous l'effet d'une différence de pression donnée et à empêcher ce passage lorsque la différence de pression est inférieure à la différence de pression donnée, est en outre placé dans la conduite 10.The sealing device according to the invention notably comprises a pipe 10 connecting the intake pipe 2 to the cam box 4. A non-return valve 11 or any other means intended to allow the fluid to pass under the effect of a given pressure difference and to prevent this passage when the pressure difference is less than the given pressure difference, is further placed in line 10.

Le clapet 11 permet donc de séparer la conduite 10 en deux volumes : le premier volume 12 en liaison avec la boîte à cames 4, le deuxième volume 13 communiquant avec la canalisation d'admission 2. Dans le premier volume 12 règne une pression P1 tandis que dans le deuxième volume 13 règne une pression P2. Le clapet 11 s'ouvre lorsque la pression P2 est supérieure à la pression P1, faisant ainsi jouer au volume 12 le rôle d'une capacité de stockage de pression.The valve 11 therefore makes it possible to separate the pipe 10 into two volumes: the first volume 12 in connection with the cam box 4, the second volume 13 communicating with the intake pipe 2. In the first volume 12 there is a pressure P1 while that in the second volume 13 there is a pressure P2. The valve 11 opens when the pressure P2 is greater than the pressure P1, thus making the volume 12 play the role of a pressure storage capacity.

Il faut préciser que selon le mode de réalisation de la figure 1 le volume 12 est en fait quasi inexistant de sorte que la pression P1 est la pression dans la boîte à cames 4.It should be noted that according to the embodiment of FIG. 1, the volume 12 is in fact almost nonexistent, so that the pressure P1 is the pressure in the cam box 4.

La figure 2 illustre un mode de réalisation dans lequel le volume 12 apparaît clairement.FIG. 2 illustrates an embodiment in which the volume 12 appears clearly.

Les modes de réalisation des figures 1 et 2 différent notamment par l'endroit où débouche le conduit 10 :The embodiments of FIGS. 1 and 2 differ in particular in the place where the conduit 10 opens:

Sur la figure 1 le conduit 10 débouche vers la chambre de combustion 1 à proximité de l'orifice d'admission 6, tandis que sur la figure 2 le piquage est davantage en amont.In FIG. 1, the duct 10 opens out towards the combustion chamber 1 near the intake orifice 6, while in FIG. 2 the tapping is more upstream.

La canalisation 2 peut véhiculer par exemple un fluide ayant la pression du carter-pompe, pression qui bien entendu varie pendant chaque cycle moteur.Line 2 can convey, for example, a fluid having the pressure of the pump housing, a pressure which of course varies during each engine cycle.

Le clapet anti-retour 11 permet donc de stocker dans le volume 12 et dans l'espace 4 la pression maximale P1 obtenue pendant chaque cycle. Cette pression va s'opposer, notamment au niveau de la queue 52 de la soupape 5, à la pression P2 qui règne à proximité de l'orifice d'admission 6 et qui est obligatoirement inférieure ou au plus égale à P1.The non-return valve 11 therefore makes it possible to store in the volume 12 and in the space 4 the maximum pressure P1 obtained during each cycle. This pressure will oppose, in particular at the level of the stem 52 of the valve 5, the pressure P2 which prevails near the inlet orifice 6 and which is necessarily less than or at most equal to P1.

La soupape 5 peut être utilisée pour réaliser une injection pneumatique de carburant dans la chambre de combustion 1, à partir d'air comprimé prélevé par exemple, dans le carter-pompe d'un moteur deux temps.The valve 5 can be used to carry out a pneumatic injection of fuel into the combustion chamber 1, from compressed air taken, for example, from the pump housing of a two-stroke engine.

Sans sortir du cadre de l'invention, l'air comprimé peut être fourni par un compresseur extérieur au cylindre.Without departing from the scope of the invention, the compressed air can be supplied by a compressor external to the cylinder.

Un organe d'introduction de carburant (non visible sur les figures) peut être prévu ; il peut déboucher dans la canalisation d'admission 2, de sorte que la soupape réalise alors une fonction d'injection pneumatique de carburant dans la chambre de combustion.A fuel introduction member (not visible in the figures) can be provided; it can open into the intake pipe 2, so that the valve then performs a pneumatic fuel injection function in the combustion chamber.

Bien entendu, d'autres modifications et/ou améliorations pourront être imaginées pas l'homme du métier au dispositif qui vient d'être décrit sans sortir du cadre de la présente invention.Of course, other modifications and / or improvements could be imagined by those skilled in the art to the device which has just been described without departing from the scope of the present invention.

Claims (4)

1. - Dispositif d'étanchéité pour queue de soupape commandée par une came contenue dans un boîtier d'arbre à cames d'un moteur à combustion interne ayant au moins un cylindre caractérisé en ce qu'il comporte une conduite (10) reliant d'une part une canalisation d'admission (2) d'un mélange carburé dans une chambre de combustion (1), obturée par une soupape (5) et d'autre part un boîtier (4) d'arbre à cames, le dispositif comportant en outre un clapet anti-retour (11) placé dans ladite conduite (10) afin de séparer ladite conduite (10) en deux volumes (12, 13) le premier volume (12) étant relié au boîtier (4) et constituant une capacité sous pression ayant une pression P1 supérieure ou égale à la pression P2 régnant dans la canalisation d'admission (2) et dans le deuxième volume (13), ledit dispositif étant destiné à éviter les fuites de carburant de la canalisation d'admission (2) vers le boîtier d'arbre à cames (4). 1. - Sealing device for valve stem controlled by a cam contained in a camshaft housing of an internal combustion engine having at least one cylinder characterized in that it comprises a line (10) connecting d firstly an inlet pipe (2) of a fuel mixture into a combustion chamber (1), closed by a valve (5) and secondly a camshaft housing (4), the device further comprising a non-return valve (11) placed in said pipe (10) in order to separate said pipe (10) into two volumes (12, 13) the first volume (12) being connected to the housing (4) and constituting a pressurized capacity having a pressure P1 greater than or equal to the pressure P2 prevailing in the intake pipe (2) and in the second volume (13), said device being intended to prevent fuel leaks from the intake pipe ( 2) to the camshaft housing (4). 2. - Dispositif d'étanchéité selon la revendication 1 caractérisé en ce que le deuxième volume (13) est relié à un carter-pompe d'un cylindre du moteur à combustion interne. 2. - A sealing device according to claim 1 characterized in that the second volume (13) is connected to a pump housing of a cylinder of the internal combustion engine. 3. - Dispositif d'étanchéité selon la revendication 1 caractérisé en ce que le deuxième volume (13) est relié à un compresseur extérieur au cylindre. 3. - Sealing device according to claim 1 characterized in that the second volume (13) is connected to an external compressor to the cylinder. 4 - Dispositif selon l'une quelconque des revendications précédentes caractérisé en ce que la canalisation d'admission (2) est alimentée en air comprimé et elle comporte un injecteur pneumatique de carburant de sorte que ladite soupape (5) agit en tant qu'injecteur pneumatique pour pulvériser ledit carburant dans la chambre de combustion (1). 4 - Device according to any one of the preceding claims, characterized in that the intake pipe (2) is supplied with compressed air and it comprises a pneumatic fuel injector so that said valve (5) acts as an injector pneumatic for spraying said fuel into the combustion chamber (1).
EP94400923A 1993-06-07 1994-04-28 Sealing arrangement for internal combustion engine valve stem Expired - Lifetime EP0628701B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9306785 1993-06-07
FR9306785A FR2706181B1 (en) 1993-06-07 1993-06-07 Sealing device for valve stem of an internal combustion engine.

Publications (2)

Publication Number Publication Date
EP0628701A1 true EP0628701A1 (en) 1994-12-14
EP0628701B1 EP0628701B1 (en) 1996-12-04

Family

ID=9447821

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94400923A Expired - Lifetime EP0628701B1 (en) 1993-06-07 1994-04-28 Sealing arrangement for internal combustion engine valve stem

Country Status (5)

Country Link
US (1) US5398650A (en)
EP (1) EP0628701B1 (en)
JP (1) JPH0734817A (en)
DE (1) DE69401032T2 (en)
FR (1) FR2706181B1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2112045A (en) * 1935-04-03 1938-03-22 Gen Electric Seal for combustion engines
FR1021812A (en) * 1950-03-06 1953-02-24 Fluid leakage protection device
US3120221A (en) * 1962-02-13 1964-02-04 Lyons Jim Pneumatic valve return for internal combustion engines
EP0269587A1 (en) * 1986-10-20 1988-06-01 Ab Volvo Valve spring device in internal-combustion engines
EP0435730A1 (en) * 1989-12-29 1991-07-03 Institut Francais Du Petrole Two-stroke engine with controlled pneumatic injection

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4753198A (en) * 1986-02-04 1988-06-28 Heath Kenneth E Compression ratio control mechanism for internal combustion engines
US4706967A (en) * 1987-03-27 1987-11-17 General Motors Corporation Valve guide seal device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2112045A (en) * 1935-04-03 1938-03-22 Gen Electric Seal for combustion engines
FR1021812A (en) * 1950-03-06 1953-02-24 Fluid leakage protection device
US3120221A (en) * 1962-02-13 1964-02-04 Lyons Jim Pneumatic valve return for internal combustion engines
EP0269587A1 (en) * 1986-10-20 1988-06-01 Ab Volvo Valve spring device in internal-combustion engines
EP0435730A1 (en) * 1989-12-29 1991-07-03 Institut Francais Du Petrole Two-stroke engine with controlled pneumatic injection

Also Published As

Publication number Publication date
DE69401032T2 (en) 1997-04-03
FR2706181A1 (en) 1994-12-16
FR2706181B1 (en) 1995-09-01
US5398650A (en) 1995-03-21
EP0628701B1 (en) 1996-12-04
DE69401032D1 (en) 1997-01-16
JPH0734817A (en) 1995-02-03

Similar Documents

Publication Publication Date Title
CA2544956A1 (en) Controlled leakage valve for piston cooling sprinkler
FR2533186A1 (en) EMPTY SURCHARGER DEVICE DECOMPRESSOR FOR VEHICLES
WO1998051911A1 (en) Device for varying a piston engine effective volumetric displacement and/or volumetric ratio of during its operation
FR2722242A1 (en) CONTROL DEVICE FOR AN ENGINE BRAKE VALVE OF AN INTERNAL COMBUSTION ENGINE
FR2561309A1 (en) SAFETY VALVE FOR INTERNAL COMBUSTION ENGINE TURBOCHARGER
EP2363585A1 (en) Air charged combustion engine
WO1996011333A1 (en) Pneumatically-controlled air-fuel mixture injection in a two-stroke engine
EP0786045B1 (en) Two-stroke engine comprising an enhanced injection device and associated injection method
EP0789138B1 (en) Two stroke engine having a control means for the valve movement
EP0628701B1 (en) Sealing arrangement for internal combustion engine valve stem
EP0691472B1 (en) Internal combustion engine with pressure tank for specific purposes
EP0577451B1 (en) Device for controlling the pneumatic injection of carburetted mixture for a two stroke internal combustion engine and its use
FR2632684A1 (en) DEVICE AND METHOD FOR THE PRESSURIZED INTRODUCTION OF A CARBIDE MIXTURE IN THE CYLINDER OF AN ENGINE
EP0238584A1 (en) Method and device for the control of an exhaust gas circuit of an engine.
EP0406078B1 (en) Two-stroke engine with rotating valves and operation of said engine
FR2961566A1 (en) Jack actuator for mobile body in turboshaft engine e.g. turbojet of airplane, has fixed body comprising connection unit that is connected to pressurized fluid source emerging in single body on both sides of pistons
FR2519695A1 (en) Supercharged four stroke IC-engine - has combustion chambers fed via pumping chamber in crankcase
FR3053388A1 (en) BACK LUBRICATION OF CAMS BY OIL RECOVERY
FR2678319A1 (en) System for aiding with the atomisation of a carburetted mixture in a combustion chamber and application of the system to an internal combustion engine
EP3056697B1 (en) Device and method for cleaning a circuit for sucking gases from a housing
FR2890689A1 (en) Duct e.g. air intake duct, cleaning device for internal combustion engine, has cylindrical helical spring to apply oscillatory movement to washer around rest position, where washer rubs on inner wall of duct
WO2022117934A1 (en) Scoop for an aircraft turbine engine
WO2023072711A1 (en) High-pressure pump for motor vehicle internal combustion engine
BE1010732A3 (en) Partial sealing device of injection internal combustion engine admission circuit
FR3059736A1 (en) PNEUMATIC ACTUATOR FOR DISPLACING A THREE POSITIONS ELEMENT AND THERMAL MOTOR AIR CIRCUIT ASSEMBLY COMPRISING SAME

Legal Events

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

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19940506

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): BE DE GB IT

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: 19960403

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

ITF It: translation for a ep patent filed

Owner name: MARIETTI E GISLON S.R.L.

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): BE DE GB IT

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

Effective date: 19961205

REF Corresponds to:

Ref document number: 69401032

Country of ref document: DE

Date of ref document: 19970116

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: GB

Payment date: 20000323

Year of fee payment: 7

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

Ref country code: BE

Payment date: 20000418

Year of fee payment: 7

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

Ref country code: DE

Payment date: 20000427

Year of fee payment: 7

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 NON-PAYMENT OF DUE FEES

Effective date: 20010428

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

Ref country code: BE

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

Effective date: 20010430

BERE Be: lapsed

Owner name: INSTITUT FRANCAIS DU PETROLE

Effective date: 20010430

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20010428

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: 20020201

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

Ref country code: IT

Payment date: 20070618

Year of fee payment: 14

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

Ref country code: IT

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

Effective date: 20080428