EP0454512B1 - Purifying and recirculation system for blow-by gas of the crankcase of an internal combustion engine and internal combustion engine fit out with this system - Google Patents

Purifying and recirculation system for blow-by gas of the crankcase of an internal combustion engine and internal combustion engine fit out with this system Download PDF

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Publication number
EP0454512B1
EP0454512B1 EP19910400757 EP91400757A EP0454512B1 EP 0454512 B1 EP0454512 B1 EP 0454512B1 EP 19910400757 EP19910400757 EP 19910400757 EP 91400757 A EP91400757 A EP 91400757A EP 0454512 B1 EP0454512 B1 EP 0454512B1
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EP
European Patent Office
Prior art keywords
cylinder head
chamber
internal combustion
combustion engine
head cover
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
EP19910400757
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German (de)
French (fr)
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EP0454512A1 (en
Inventor
Jacques Dore
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.)
Automobiles Peugeot SA
Automobiles Citroen SA
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Automobiles Peugeot SA
Automobiles Citroen SA
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Publication of EP0454512A1 publication Critical patent/EP0454512A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F7/00—Casings, e.g. crankcases or frames
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M13/00—Crankcase ventilating or breathing
    • F01M13/04—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil
    • F01M13/0416—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil arranged in valve-covers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
    • F02B2275/18—DOHC [Double overhead camshaft]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F7/00—Casings, e.g. crankcases or frames
    • F02F7/006—Camshaft or pushrod housings

Definitions

  • the present invention essentially relates to a device for recovering and recycling unburnt combustion gases emanating from the casing of an internal combustion engine.
  • decanting is carried out by means of a sheet, usually of complex shape, mounted in the decanting chamber.
  • a sheet usually of complex shape
  • Such an assembly is complex, expensive, and most often generates noise due to vibrations of the sheet in the chamber during engine operation.
  • Such a device is described by US-A-4,723,529.
  • the present invention aims to remedy these drawbacks in particular by proposing an improved recovery and recycling device and making it possible to avoid mounting a sheet of complex shape in the settling chamber, and which is consequently less expensive and technically simpler. With such a device, it is also possible to avoid any vibration generating noise during engine operation.
  • the subject of the present invention is a device for recovering and recycling unburnt combustion gases emanating from the casing of an internal combustion engine, of the type comprising, in the upper part of the engine, at least one chamber communicating with the intake circuit and with the casing to recycle respectively said unburnt combustion gases towards the intake and the oil withdrawn from these gases towards said casing, in which walls are formed in the foundry of the cylinder head cover to constitute, during assembly, said chamber.
  • the invention is characterized in that the cylinder head foundry has a wall situated in the joint plane of the cylinder head and the cylinder head cover, which wall constitutes the bottom wall of the chamber cited above.
  • said wall is pierced with orifices for the passage of unburnt combustion gases and for discharging the oil.
  • the foundry of the cylinder head cover forms a substantially U-shaped cross section conduit whose end of the branches bears on the aforementioned bottom wall, and which extends in a closed loop in substantially the joint plane of the cylinder head and the cylinder head cover.
  • the aforementioned conduit comprises baffles coming from molding with the cylinder head cover.
  • At least one screen is interposed in the aforementioned conduit to filter unburnt combustion gases before their recycling.
  • Figure 1 is a cross-sectional view, along a substantially vertical plane, of an engine equipped with a device according to the invention.
  • Figure 2 is a partial sectional view of the engine, along a sectional plane passing through the axes of the rods of two valves of a cylinder of this engine.
  • FIG. 3 is a partial view of the cylinder head cover, in section along line III-III in FIG. 2.
  • Figure 4 is a partial sectional view of the upper part of the engine, along line IV-IV of the figure 2.
  • FIG. 5 is a sectional view of the engine, along the line V-V of FIG. 4.
  • Figure 6 is a sectional view of the engine, similar to Figure 5 and illustrating a gas transit solution from the housing.
  • an internal combustion engine 1 with, at its lower part, a casing 2 into which opens an internal pipe 3 for connecting the casing 2 to a chamber 4 for recovering and decanting unburnt combustion gases emanating from of the casing 2.
  • This chamber 4 is located at the upper part of the engine 1, and we see at 5 the cylinder head of the engine on which is mounted a cylinder head cover 6.
  • This chamber 4, which forms, with the conduit 3, the recovery and recycling device according to the invention will now be described more precisely with reference to FIGS. 2 to 6.
  • the cylinder head cover 6 has an upper wall 16 from which two substantially parallel walls or partitions 36 project.
  • the partitions 36 and the upper wall 16 of the cylinder head cover 6 have, in cross section, substantially the shape of a U which constitutes the upper part of the chamber 4.
  • the cylinder head 5 has at its central part a wall 15 situated in the joint plane 10 of the cylinder head 5 and of the cylinder head cover 6.
  • the ends identified at 36a of the partitions 36 bear on the upper surface of the wall 15, which thus constitutes the bottom wall of chamber 4.
  • the chamber 4 is simply formed by the assembly of the walls 15, 16 and 36, which cooperate with each other during the mounting of the cylinder head cover 6 on the cylinder head 5.
  • the chamber 4 has the shape of a closed and oblong loop which extends, substantially parallel to the joint plane 10 of the cylinder head 5 and the cylinder head cover 6.
  • This oblong loop which constitutes the chamber 4 comprises two elongated parts 4a, substantially rectilinear and parallel to the longitudinal axis of the motor 1, and two curved parts 4b which connect the ends of the elongate parts 4a in pairs.
  • the seal between the partitions 36 and the wall 15 is ensured by two seals identified at 7 which are mounted in two housings 26 formed in the ends 36a of the partitions 36.
  • the partitions 36 of the chamber 4 include baffles 14, molded with the cylinder head cover 6 and projecting into the chamber 4, perpendicular to the bottom wall 15 and to the longitudinal direction of the parts 4a in which these baffles 14 are formed.
  • the baffles 14 make it possible to calm the gases which circulate in the chamber 4 and, consequently, to improve the separation of the gases and of the oil in suspension in these.
  • the screen 18 comes integrally with the partitions 36 of the cylinder head cover 6. It is understood that this screen makes it possible to filter the impurities suspended in the unburnt combustion gases, before these are recycled. It will be noted here that one or more similar sieves can be interposed in chamber 4.
  • connection conduit 3 is connected to the chamber 4 by an intermediate chamber 11.
  • This intermediate chamber 11 comprises a vertical partition 12 which defines two communicating volumes.
  • a tube 19 passes through one of the partitions 36 and opens into the chamber 4.
  • This tube 19 is assembled to the partition 36, for example by press fitting, so as to project from the cylinder head cover 6, substantially along the axis longitudinal of the engine 1.
  • This tube 19 allows the connection of the chamber 4 to the intake circuit (not shown) of the combustion gases to the engine 1.
  • the device for recycling and recovering unburnt combustion gases which has just been described operates in the following manner.
  • the recovery circuit formed by the connection conduit 3, the chambers 4 and 11 and as well as by the tube 19 is kept under vacuum under the effect of the suction of the intake circuit.
  • a vacuum causes the unburnt combustion gases to circulate accumulating in the casing 2, as illustrated by the arrows visible in FIG. 1.
  • the gases first pass through the connection conduit 3 to the chamber 11 and, as seen in FIG. 6, enter the chamber 4 through the orifice 25 formed in the wall 15.
  • the gases in circulation then invade the two elongated parts 4a, and are tranquilized by the baffles 14.
  • the oil suspended in the gases thus tranquilized is deposited on the walls 15, 16 and 36 as well as on the baffles 14, which makes it possible to decant the gases emanating from the casing 2, before recycling them in the intake circuit.
  • the oil thus separated from the gas collects under the effect of gravity at the bottom wall 15 and flows into the cavity C of the cylinder head 5 through the discharge orifices 13.
  • the decanted gases are filtered by the screen 18 and are routed, as illustrated by the arrows visible in FIG. 5, to the gas intake circuit to the engine 1, via the connection tube 19.
  • the recovery and recycling circuit unburnt combustion gases emanating from the casing may include one or more chambers of any shape, depending on the type of engine to which this circuit is to be applied, this or these chambers being produced by complementary walls and / or cavities, coming from molding with the cylinder head and the cylinder head cover.
  • the number and shape of the baffles and screens provided in the chamber constituted by the assembly of the cylinder head and the cylinder head cover are arbitrary and are determined according to the engine to which we are dealing.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Description

La présente invention se rapporte essentiellement à un dispositif de récupération et de recyclage des gaz de combustion imbrûlés émanant du carter d'un moteur à combustion interne.The present invention essentially relates to a device for recovering and recycling unburnt combustion gases emanating from the casing of an internal combustion engine.

Elle vise également un moteur à combustion interne, pour un véhicule de type quelconque, équipé de ce dispositif.It also relates to an internal combustion engine, for a vehicle of any type, equipped with this device.

Lors du fonctionnement d'un moteur à combustion interne, il se produit des fuites de gaz de combustion imbrûlés au niveau des segments des pistons de ce moteur et qui s'accumulent dans le carter. Ces gaz sont ensuite récupérés par recyclage dans le système d'admission du moteur. Avant recyclage, ils sont tout d'abord brassés par le mouvement des pistons, des bielles et du vilebrequin, et ensuite par le mouvement du ou des arbres à cames, dans un milieu en contact avec l'huile du moteur, ce qui a pour effet de charger les gaz de combustion imbrûlés en huile. Afin de respecter les normes de pollution, il est nécessaire d'assurer une séparation gaz de combustion/huile avant de recycler les gaz dans le système d'admission du moteur.During the operation of an internal combustion engine, unburnt combustion gas leaks from the piston rings of this engine and which accumulate in the crankcase. These gases are then recovered by recycling in the engine's intake system. Before recycling, they are firstly stirred by the movement of the pistons, connecting rods and crankshaft, and then by the movement of the camshaft (s), in a medium in contact with the engine oil, which has for effect of charging unburnt combustion gases with oil. In order to comply with pollution standards, it is necessary to ensure a combustion gas / oil separation before recycling the gases in the engine's intake system.

On a déjà proposé des dispositifs de récupération et de recyclage des gaz de combustion imbrûlés émanant du carter d'un moteur à combustion interne, du type comportant une chambre de décantage en partie supérieure du moteur, pour la séparation de l'huile et des gaz à récupérer. Dans cette chambre, débouchent d'une part, un conduit interne de raccordement au carter du moteur, et d'autre part un conduit de réaspiration des gaz par le système d'admission du moteur.Devices have already been proposed for recovering and recycling unburnt combustion gases emanating from the casing of an internal combustion engine, of the type comprising a settling chamber in the upper part of the engine, for the separation of oil and gases. to get back. In this chamber, open on the one hand, an internal conduit for connection to the motor casing, and on the other hand a conduit gas re-aspiration by the engine's intake system.

Cependant, le décantage est effectué par l'intermédiaire d'une tôle, le plus souvent de forme complexe, montée dans la chambre de décantage. Un tel assemblage est complexe, coûteux, et est le plus souvent générateur de bruits dus aux vibrations de la tôle dans la chambre lors du fonctionnement du moteur. Un tel dispositif est décrit par US-A-4 723 529.However, decanting is carried out by means of a sheet, usually of complex shape, mounted in the decanting chamber. Such an assembly is complex, expensive, and most often generates noise due to vibrations of the sheet in the chamber during engine operation. Such a device is described by US-A-4,723,529.

Aussi, la présente invention a pour but de remédier notamment à ces inconvénients en proposant un dispositif de récupération et de recyclage perfectionné et permettant d'éviter le montage d'une tôle de forme complexe dans la chambre de décantage, et qui est par conséquence moins coûteux et techniquement plus simple. Avec un tel dispositif, il est également possible d'éviter toute vibration génératrice de bruits lors du fonctionnement du moteur.Also, the present invention aims to remedy these drawbacks in particular by proposing an improved recovery and recycling device and making it possible to avoid mounting a sheet of complex shape in the settling chamber, and which is consequently less expensive and technically simpler. With such a device, it is also possible to avoid any vibration generating noise during engine operation.

A cet effet, la présente invention a pour objet un dispositif de récupération et de recyclage des gaz de combustion imbrûlés émanant du carter d'un moteur à combustion interne, du type comprenant, en partie supérieure du moteur, au moins une chambre communiquant avec le circuit d'admission et avec le carter pour recycler respectivement lesdits gaz de combustion imbrûlés vers l'admission et l'huile retirée de ces gaz vers ledit carter, dans lequel des parois sont formées dans la fonderie du couvre-culasse du moteur pour constituer, à l'assemblage, ladite chambre.To this end, the subject of the present invention is a device for recovering and recycling unburnt combustion gases emanating from the casing of an internal combustion engine, of the type comprising, in the upper part of the engine, at least one chamber communicating with the intake circuit and with the casing to recycle respectively said unburnt combustion gases towards the intake and the oil withdrawn from these gases towards said casing, in which walls are formed in the foundry of the cylinder head cover to constitute, during assembly, said chamber.

L'invention est caractérisée en ce que la fonderie de la culasse comporte une paroi située dans le plan de joint de la culasse et du couvre-culasse, laquelle paroi constitue la paroi de fond de la chambre précitée. De plus, ladite paroi est percée d'orifices de passage des gaz de combustion imbrûlés et d'évacuation de l'huile.The invention is characterized in that the cylinder head foundry has a wall situated in the joint plane of the cylinder head and the cylinder head cover, which wall constitutes the bottom wall of the chamber cited above. In addition, said wall is pierced with orifices for the passage of unburnt combustion gases and for discharging the oil.

Suivant encore un autre avantage de l'invention, la fonderie du couvre-culasse forme un conduit de section transversale sensiblement en U dont l'extrémité des branches prend appui sur la paroi de fond précitée, et qui s'étend suivant une boucle fermée dans sensiblement le plan de joint de la culasse et du couvre-culasse.According to yet another advantage of the invention, the foundry of the cylinder head cover forms a substantially U-shaped cross section conduit whose end of the branches bears on the aforementioned bottom wall, and which extends in a closed loop in substantially the joint plane of the cylinder head and the cylinder head cover.

On préciséra ici que le conduit précité comporte des chicanes venant de moulage avec le couvre-culasse.It will be specified here that the aforementioned conduit comprises baffles coming from molding with the cylinder head cover.

Selon encore un autre avantage de l'invention, au moins un tamis est interposé dans le conduit précité pour filtrer les gaz de combustion imbrûlés avant leur recyclage.According to yet another advantage of the invention, at least one screen is interposed in the aforementioned conduit to filter unburnt combustion gases before their recycling.

Mais d'autres avantages de l'invention apparaîtront mieux dans la description détaillée qui suit et se réfère aux dessins annexés, donnés uniquement à titre d'exemple, et dans lesquels :However, other advantages of the invention will appear more clearly in the detailed description which follows and which refers to the appended drawings, given solely by way of example, and in which:

La figure 1 est une vue en coupe transversale, suivant un plan sensiblement vertical, d'un moteur équipé d'un dispositif conforme à l'invention.Figure 1 is a cross-sectional view, along a substantially vertical plane, of an engine equipped with a device according to the invention.

La figure 2 est une vue en coupe partielle du moteur, suivant un plan de coupe passant par les axes des tiges de deux soupapes d'un cylindre de ce moteur.Figure 2 is a partial sectional view of the engine, along a sectional plane passing through the axes of the rods of two valves of a cylinder of this engine.

La figure 3 est une vue partielle du couvre-culasse, en coupe suivant la ligne III-III de la figure 2.FIG. 3 is a partial view of the cylinder head cover, in section along line III-III in FIG. 2.

La figure 4 est une vue en coupe partielle de la partie supérieure du moteur, suivant la ligne IV-IV de la figure 2.Figure 4 is a partial sectional view of the upper part of the engine, along line IV-IV of the figure 2.

La figure 5 est une vue en coupe du moteur, suivant la ligne V-V de la figure 4.FIG. 5 is a sectional view of the engine, along the line V-V of FIG. 4.

La figure 6 est une vue en coupe du moteur, similaire à la figure 5 et illustrant une solution de transit des gaz provenant du carter.Figure 6 is a sectional view of the engine, similar to Figure 5 and illustrating a gas transit solution from the housing.

On voit sur la figure 1, un moteur à combustion interne 1 avec, à sa partie inférieure, un carter 2 dans lequel débouche une conduite interne 3 de raccordement du carter 2 à une chambre 4 de récupération et de décantage des gaz de combustion imbrûlés émanant du carter 2. Cette chambre 4 est située à la partie supérieure du moteur 1, et on voit en 5 la culasse du moteur sur laquelle est monté un couvre-culasse 6. Cette chambre 4, qui fait partie, avec le conduit 3, du dispositif de récupération et de recyclage conforme à l'invention, va maintenant être décrite plus précisément en se reportant aux figures 2 à 6.We see in Figure 1, an internal combustion engine 1 with, at its lower part, a casing 2 into which opens an internal pipe 3 for connecting the casing 2 to a chamber 4 for recovering and decanting unburnt combustion gases emanating from of the casing 2. This chamber 4 is located at the upper part of the engine 1, and we see at 5 the cylinder head of the engine on which is mounted a cylinder head cover 6. This chamber 4, which forms, with the conduit 3, the recovery and recycling device according to the invention will now be described more precisely with reference to FIGS. 2 to 6.

Le couvre-culasse 6 comporte une paroi supérieure 16 d'où font saillie deux parois ou cloisons 36 sensiblement parallèles.The cylinder head cover 6 has an upper wall 16 from which two substantially parallel walls or partitions 36 project.

Ainsi, comme on le voit sur la figure 2 notamment, les cloisons 36 et la paroi supérieure 16 du couvre-culasse 6 présentent, en section transversale, sensiblement la forme d'un U qui constitue la partie supérieure de la chambre 4. On voit sur la figure 2 que la culasse 5 comporte à sa partie centrale une paroi 15 située dans le plan de joint 10 de la culasse 5 et du couvre-culasse 6. Les extrémités répérées en 36a des cloisons 36 prennent appui sur la surface supérieure de la paroi 15, qui constitue ainsi la paroi de fond de la chambre 4.Thus, as seen in Figure 2 in particular, the partitions 36 and the upper wall 16 of the cylinder head cover 6 have, in cross section, substantially the shape of a U which constitutes the upper part of the chamber 4. We see in FIG. 2 that the cylinder head 5 has at its central part a wall 15 situated in the joint plane 10 of the cylinder head 5 and of the cylinder head cover 6. The ends identified at 36a of the partitions 36 bear on the upper surface of the wall 15, which thus constitutes the bottom wall of chamber 4.

On comprend déjà que la chambre 4 est simplement formée par l'assemblage des parois 15, 16 et 36, qui coopèrent l'une avec l'autre lors du montage du couvre-culasse 6 sur la culasse 5.It is already understood that the chamber 4 is simply formed by the assembly of the walls 15, 16 and 36, which cooperate with each other during the mounting of the cylinder head cover 6 on the cylinder head 5.

Suivant l'exemple illustré, la chambre 4 a la forme d'une boucle fermée et oblongue qui s'étend, sensiblement parallèlement au plan de joint 10 de la culasse 5 et du couvre-culasse 6. Cette boucle oblongue qui constitue la chambre 4 comporte deux parties allongées 4a, sensiblement rectilignes et parallèles à l'axe longitudinal du moteur 1, et deux parties courbes 4b qui raccordent deux à deux les extrémités des parties allongées 4a.According to the example illustrated, the chamber 4 has the shape of a closed and oblong loop which extends, substantially parallel to the joint plane 10 of the cylinder head 5 and the cylinder head cover 6. This oblong loop which constitutes the chamber 4 comprises two elongated parts 4a, substantially rectilinear and parallel to the longitudinal axis of the motor 1, and two curved parts 4b which connect the ends of the elongate parts 4a in pairs.

L'étanchéité entre les cloisons 36 et la paroi 15 est assurée par deux joints répérés en 7 qui sont montés dans deux logements 26 formés dans les extrémités 36a des cloisons 36.The seal between the partitions 36 and the wall 15 is ensured by two seals identified at 7 which are mounted in two housings 26 formed in the ends 36a of the partitions 36.

On voit bien sur les figures 2 et 3 qu'au niveau des parties allongées 4a de la chambre 4, la paroi de fond 15 de la chambre 4 est percée d'orifices 13 d'évacuation de l'huile séparée des gaz. Ces orifices d'évacuation 13 relient l'intérieur de la chambre 4 à une cavité C de la culasse 5 et débouchent, comme on le voit sur la figure 2, au droit des tiges de soupapes T qui font saillie dans la cavité précitée de la culasse 5. Le nombre et le diamètre de ces orifices d'évacuation 13 est déterminé en fonction des caractéristiques de la circulation des gaz dans la chambre 4.It can be seen in Figures 2 and 3 that at the elongated parts 4a of the chamber 4, the bottom wall 15 of the chamber 4 is pierced with orifices 13 for discharging the oil separated from the gases. These discharge orifices 13 connect the interior of the chamber 4 to a cavity C of the cylinder head 5 and open, as can be seen in FIG. 2, in line with the valve stems T which protrude into the aforementioned cavity of the cylinder head 5. The number and the diameter of these discharge orifices 13 is determined as a function of the characteristics of the gas circulation in the chamber 4.

En revenant maintenant à la figure 3, on remarque qu'au niveau des parties allongées 4a, les cloisons 36 de la chambre 4 comportent des chicanes 14, venues de moulage avec le couvre-culasse 6 et faisant saillie dans la chambre 4, perpendiculairement à la paroi de fond 15 et à la direction longitudinale des parties 4a dans lesquelles ces chicanes 14 sont formées. Les chicanes 14 permettent de tranquilliser les gaz qui circulent dans la chambre 4 et, par conséquent, d'améliorer la séparation des gaz et de l'huile en suspension dans ceux-ci.Returning now to FIG. 3, it can be seen that at the level of the elongated parts 4a, the partitions 36 of the chamber 4 include baffles 14, molded with the cylinder head cover 6 and projecting into the chamber 4, perpendicular to the bottom wall 15 and to the longitudinal direction of the parts 4a in which these baffles 14 are formed. The baffles 14 make it possible to calm the gases which circulate in the chamber 4 and, consequently, to improve the separation of the gases and of the oil in suspension in these.

On voit également sur la figure 3, un tamis 18 interposé dans l'une des parties allongées 4a de la chambre 4, de façon sensiblement parallèle aux chicanes 14. Suivant l'exemple illustré, le tamis 18 vient de matière avec les cloisons 36 du couvre-culasse 6. On comprend que ce tamis permet de filtrer les impuretés en suspension dans les gaz de combustion imbrûlés, avant que ceux-ci ne soient recyclés. On notera ici qu'un ou plusieurs tamis similaires peuvent être interposés dans la chambre 4.Also seen in Figure 3, a screen 18 interposed in one of the elongated parts 4a of the chamber 4, substantially parallel to the baffles 14. According to the example illustrated, the screen 18 comes integrally with the partitions 36 of the cylinder head cover 6. It is understood that this screen makes it possible to filter the impurities suspended in the unburnt combustion gases, before these are recycled. It will be noted here that one or more similar sieves can be interposed in chamber 4.

On voit sur les figures 1 et 6 qu'au niveau de la partie courbe 4b de la chambre 4 qui est la plus proche du conduit de raccordement 3, la paroi 15 de la culasse 5 comporte un orifice 25 de passage des gaz de combustion imbrûlés provenant du carter 2 via le conduit de raccordement 3. Suivant la solution de transit visible sur ces figures, le conduit de raccordement 3 est relié à la chambre 4 par une chambre intermédiaire 11. Cette chambre intermédiaire 11 comporte une cloison verticale 12 qui définit deux volumes communiquants.We see in Figures 1 and 6 that at the curved portion 4b of the chamber 4 which is closest to the connection conduit 3, the wall 15 of the cylinder head 5 has an orifice 25 for the passage of unburnt combustion gases coming from the casing 2 via the connection conduit 3. According to the transit solution visible in these figures, the connection conduit 3 is connected to the chamber 4 by an intermediate chamber 11. This intermediate chamber 11 comprises a vertical partition 12 which defines two communicating volumes.

Au niveau de la partie courbée 4b qui est située à l'autre extrémité de la chambre 4, un tube 19 traverse l'une des cloisons 36 et débouche dans la chambre 4. Ce tube 19 est assemblé à la cloison 36, par exemple par emmanchement à force, de manière à faire saillie du couvre-culasse 6, sensiblement suivant l'axe longitudinal du moteur 1. Ce tube 19 permet le raccordement de la chambre 4 au circuit d'admission (non représenté) des gaz de combustion au moteur 1.At the curved part 4b which is located at the other end of the chamber 4, a tube 19 passes through one of the partitions 36 and opens into the chamber 4. This tube 19 is assembled to the partition 36, for example by press fitting, so as to project from the cylinder head cover 6, substantially along the axis longitudinal of the engine 1. This tube 19 allows the connection of the chamber 4 to the intake circuit (not shown) of the combustion gases to the engine 1.

Le dispositif de recyclage et de récupération des gaz de combustion imbrûlés qui vient d'être décrit fonctionne de la façon suivante.The device for recycling and recovering unburnt combustion gases which has just been described operates in the following manner.

Le circuit de récupération formé par le conduit de raccordement 3, les chambres 4 et 11 et ainsi que par le tube 19 est maintenu en dépression sous l'effet de l'aspiration du circuit d'admission. Une telle dépression provoque la mise en circulation des gaz de combustion imbrûlés s'accumulant dans le carter 2, comme illustré par les flèches visibles sur la figure 1. Les gaz parcourent tout d'abord le conduit de raccordement 3 jusqu'à la chambre 11 et, comme on le voit sur la figure 6, pénètrent dans la chambre 4 par l'orifice 25 formé dans la paroi 15. Les gaz en circulation envahissent alors les deux parties allongées 4a, et sont tranquillisés par les chicanes 14. L'huile en suspension dans les gaz ainsi tranquillisés vient se déposer sur les parois 15, 16 et 36 ainsi que sur les chicanes 14, ce qui permet de décanter les gaz émanant du carter 2, avant de les recycler dans le circuit d'admission. L'huile ainsi séparée du gaz se regroupe sous l'effet de la gravité au niveau de la paroi de fond 15 et s'écoule dans la cavité C de la culasse 5 au travers des orifices d'évacuation 13. Ensuite, les gaz décantés sont filtrés par le tamis 18 et s'acheminent, comme illustré par les flèches visibles sur la figure 5, vers le circuit d'admission des gaz au moteur 1, via le tube de raccordement 19.The recovery circuit formed by the connection conduit 3, the chambers 4 and 11 and as well as by the tube 19 is kept under vacuum under the effect of the suction of the intake circuit. Such a vacuum causes the unburnt combustion gases to circulate accumulating in the casing 2, as illustrated by the arrows visible in FIG. 1. The gases first pass through the connection conduit 3 to the chamber 11 and, as seen in FIG. 6, enter the chamber 4 through the orifice 25 formed in the wall 15. The gases in circulation then invade the two elongated parts 4a, and are tranquilized by the baffles 14. The oil suspended in the gases thus tranquilized is deposited on the walls 15, 16 and 36 as well as on the baffles 14, which makes it possible to decant the gases emanating from the casing 2, before recycling them in the intake circuit. The oil thus separated from the gas collects under the effect of gravity at the bottom wall 15 and flows into the cavity C of the cylinder head 5 through the discharge orifices 13. Next, the decanted gases are filtered by the screen 18 and are routed, as illustrated by the arrows visible in FIG. 5, to the gas intake circuit to the engine 1, via the connection tube 19.

Il convient de noter ici que le circuit de récupération et de recyclage des gaz de combustion imbrûlés émanant du carter peut comporter une ou plusieurs chambres de formes quelconques, suivant le type de moteur auquel on souhaite appliquer ce circuit, cette ou ces chambres étant réalisées par des parois et/ou cavités complémentaires, venant de moulage avec la culasse et le couvre-culasse.It should be noted here that the recovery and recycling circuit unburnt combustion gases emanating from the casing may include one or more chambers of any shape, depending on the type of engine to which this circuit is to be applied, this or these chambers being produced by complementary walls and / or cavities, coming from molding with the cylinder head and the cylinder head cover.

De même, le nombre et la forme des chicanes et des tamis prévus dans la chambre constituée par l'assemblage de la culasse et du couvre-culasse sont quelconques et sont déterminées en fonction du moteur auquel on a à faire.Likewise, the number and shape of the baffles and screens provided in the chamber constituted by the assembly of the cylinder head and the cylinder head cover are arbitrary and are determined according to the engine to which we are dealing.

Claims (6)

  1. Device for the recovery and the recycling of the unburned combustion gases from the crankcase of an internal combustion engine and of the type comprising at the upper part of the engine at least one chamber communicating with the intake circuit and with the crankcase for respectively recycling the said unburned combustion gases towards the intake and the oil seperated from these gases towards the said crankcase, the chamber (4) being constituted by walls (16, 36) formed in the cylinder head cover casting (6) and by a wall (15) which constitutes upon the assembling the bottom of the chamber (4), characterized in that the said wall (15) is formed in the cylinder head casting (5) and is located in the joint plane (10) of the said cylinder head (5) and of the cylinder head cover (6).
  2. Device according to claim 1, characterized in that that wall (15) which constitutes the bottom of the aforesaid chamber (4), is pierced with openings (13, 25) for the passage of the unburned combustion gases and for the discharge of the oil.
  3. Device according to claim 1 or 2, characterized in that the casting of the cylinder head cover (6) forms a duct with a substantially U-shaped cross section the end (36a) of the legs of which is bearing upon the aforesaid bottom wall (15) and which extends along a closed loop substantially in the joint plane (10) of the cylinder head (5) and of the cylinder head cover (6).
  4. Device according to claim 3, characterized in that the aforesaid duct comprises baffles (14) molded in one piece with the cylinder head cover (6).
  5. Device according to one of claims 3 or 4, characterized in that at least one strainer (18) is interposed in the aforesaid duct to filter the unburned combustion gases before the recycling thereof.
  6. Internal combustion engine, characterized in that it is fitted with a device according to one of claims 1 to 5.
EP19910400757 1990-04-26 1991-03-20 Purifying and recirculation system for blow-by gas of the crankcase of an internal combustion engine and internal combustion engine fit out with this system Expired - Lifetime EP0454512B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9005329 1990-04-26
FR9005329A FR2661455A1 (en) 1990-04-26 1990-04-26 DEVICE FOR RECOVERING AND RECYCLING IMBULATED COMBUSTION GASES FROM THE CASING OF AN INTERNAL COMBUSTION ENGINE, AND MOTOR EQUIPPED WITH SAID DEVICE.

Publications (2)

Publication Number Publication Date
EP0454512A1 EP0454512A1 (en) 1991-10-30
EP0454512B1 true EP0454512B1 (en) 1992-12-30

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EP19910400757 Expired - Lifetime EP0454512B1 (en) 1990-04-26 1991-03-20 Purifying and recirculation system for blow-by gas of the crankcase of an internal combustion engine and internal combustion engine fit out with this system

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Country Link
EP (1) EP0454512B1 (en)
DE (1) DE69100016T2 (en)
FR (1) FR2661455A1 (en)

Cited By (3)

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DE10341144A1 (en) * 2003-09-06 2005-04-07 Fev Motorentechnik Gmbh Multi-cylinder piston internal combustion engine with oil separation for extracted blow-by gas
DE102004041110A1 (en) * 2004-08-24 2006-03-02 Mahle Filtersysteme Gmbh Cylinder head cover for internal combustion engine used in motor vehicle, has oil return formed with return channel that is open to cylinder head in gravity force direction, and formed with larger flow resistance than channel exit
CN110748396A (en) * 2018-07-23 2020-02-04 本田技研工业株式会社 Ventilator structure of engine

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DE19703771C1 (en) * 1997-02-01 1998-06-25 Daimler Benz Ag Ventilation device for a crankcase of an internal combustion engine
JP3866394B2 (en) * 1997-10-22 2007-01-10 本田技研工業株式会社 Engine breather equipment
FR2774129B1 (en) * 1998-01-23 2000-03-10 Renault DEVICE FOR RESPIRATING THE CRANKCASE GASES OF AN INTERNAL COMBUSTION ENGINE
DE19937033A1 (en) * 1999-08-05 2001-02-08 Volkswagen Ag Ventilation device for a crankcase of an internal combustion engine
FR2819856B1 (en) * 2001-01-25 2003-04-25 Renault THERMAL ENGINE CYLINDER HAVING A MOLDED ROUTING CHANNEL
FR2861430B1 (en) * 2003-10-28 2006-02-10 Peugeot Citroen Automobiles Sa DEVICE COMPRISING A CYLINDER HEAD AND COVER MOUNTED TO THE ENGINE BLOCK FOR DEHUILING LOST GASES FROM COMBUSTION AND COMPRESSION.
FR2949823B1 (en) 2009-09-04 2013-05-10 Mark Iv Systemes Moteurs Sa DISTRIBUTOR INTEGRATING A GAS DRAINAGE CIRCUIT OF THE CARTER AND VEHICLE COMPRISING SUCH A DIVIDER

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US2844130A (en) * 1956-11-05 1958-07-22 Deere Mfg Co Internal-combustion engine
DE1426102A1 (en) * 1962-04-25 1968-12-12 Daimler Benz Ag Formation of the cylinder head and the cylinder head cover of injection internal combustion engines
JPS61277814A (en) * 1985-06-03 1986-12-08 Honda Motor Co Ltd Blow-by gas resoluting apparatus
JPS6218314U (en) * 1985-07-19 1987-02-03
US4825818A (en) * 1987-03-30 1989-05-02 Suzuki Jidosha Kogyo Kabushiki Kaisha Breather apparatus and cam chain tensioner adjuster apparatus in four-cycle engine

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10341144A1 (en) * 2003-09-06 2005-04-07 Fev Motorentechnik Gmbh Multi-cylinder piston internal combustion engine with oil separation for extracted blow-by gas
DE10341144B4 (en) * 2003-09-06 2005-11-24 Fev Motorentechnik Gmbh Multi-cylinder piston internal combustion engine with oil separation for extracted blow-by gas
DE102004041110A1 (en) * 2004-08-24 2006-03-02 Mahle Filtersysteme Gmbh Cylinder head cover for internal combustion engine used in motor vehicle, has oil return formed with return channel that is open to cylinder head in gravity force direction, and formed with larger flow resistance than channel exit
DE102004041110B4 (en) * 2004-08-24 2018-12-20 Mahle Filtersysteme Gmbh Internal combustion engine and associated cylinder head cover
CN110748396A (en) * 2018-07-23 2020-02-04 本田技研工业株式会社 Ventilator structure of engine
CN110748396B (en) * 2018-07-23 2021-09-07 本田技研工业株式会社 Ventilator structure of engine

Also Published As

Publication number Publication date
DE69100016D1 (en) 1993-02-11
DE69100016T2 (en) 1993-05-27
FR2661455A1 (en) 1991-10-31
FR2661455B1 (en) 1994-08-19
EP0454512A1 (en) 1991-10-30

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