FR2835287A1 - PISTON FOR INTERNAL COMBUSTION ENGINE AND COMBUSTION CHAMBER THEREOF - Google Patents
PISTON FOR INTERNAL COMBUSTION ENGINE AND COMBUSTION CHAMBER THEREOF Download PDFInfo
- Publication number
- FR2835287A1 FR2835287A1 FR0200924A FR0200924A FR2835287A1 FR 2835287 A1 FR2835287 A1 FR 2835287A1 FR 0200924 A FR0200924 A FR 0200924A FR 0200924 A FR0200924 A FR 0200924A FR 2835287 A1 FR2835287 A1 FR 2835287A1
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- FR
- France
- Prior art keywords
- piston
- fuel
- combustion chamber
- cell
- cylinder head
- 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
Links
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 27
- 239000000446 fuel Substances 0.000 claims abstract description 34
- 230000006835 compression Effects 0.000 claims abstract description 9
- 238000007906 compression Methods 0.000 claims abstract description 9
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 4
- 239000007789 gas Substances 0.000 claims description 11
- 238000007599 discharging Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000004071 soot Substances 0.000 description 4
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000008240 homogeneous mixture Substances 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Classifications
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- 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
- F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
- F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
- F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
- F02B23/0696—W-piston bowl, i.e. the combustion space having a central projection pointing towards the cylinder head and the surrounding wall being inclined towards the cylinder wall
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- 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
- F02B2275/14—Direct injection into combustion chamber
-
- 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
- F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
- F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
- F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
- F02B23/0645—Details related to the fuel injector or the fuel spray
- F02B23/0669—Details related to the fuel injector or the fuel spray having multiple fuel spray jets per injector nozzle
-
- 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
- F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
- F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
- F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
- F02B23/0678—Unconventional, complex or non-rotationally symmetrical shapes of the combustion space, e.g. flower like, having special shapes related to the orientation of the fuel spray jets
- F02B23/069—Unconventional, complex or non-rotationally symmetrical shapes of the combustion space, e.g. flower like, having special shapes related to the orientation of the fuel spray jets characterised by its eccentricity from the cylinder axis
-
- 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
- F02B3/00—Engines characterised by air compression and subsequent fuel addition
- F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
-
- 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
- F02F1/00—Cylinders; Cylinder heads
- F02F1/24—Cylinder heads
- F02F2001/244—Arrangement of valve stems in cylinder heads
- F02F2001/245—Arrangement of valve stems in cylinder heads the valve stems being orientated at an angle with the cylinder axis
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combustion Methods Of Internal-Combustion Engines (AREA)
Abstract
Piston (5) pour moteur à combustion interne à allumage par compression, le piston étant destiné à coulisser avec un mouvement alternatif dans un cylindre (2), caractérisé par le fait que le piston comprenant une face supérieure (27) pourvue d'une pluralité d'alvéoles (26) apte à coopérer à la formation d'une chambre de combustion, chaque alvéole (26) est formée selon un rayon du piston et suit la trajectoire d'un jet de carburant généré par un injecteur.Piston (5) for an internal combustion engine with compression ignition, the piston being intended to slide with an alternating movement in a cylinder (2), characterized in that the piston comprising an upper face (27) provided with a plurality cells (26) capable of cooperating in the formation of a combustion chamber, each cell (26) is formed along a radius of the piston and follows the trajectory of a jet of fuel generated by an injector.
Description
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Piston pour moteur à combustion interne et chambre de combustion associée. Piston for internal combustion engine and associated combustion chamber.
La présente invention concerne un piston pour moteur à combustion interne, et plus particulièrement un piston pour moteur à allumage par compression. The present invention relates to a piston for an internal combustion engine, and more particularly to a piston for a compression ignition engine.
Un moteur à combustion interne comprend généralement un carter dans lequel est formé au moins un cylindre, une culasse fermant une extrémité supérieure du cylindre, et un piston destiné à coulisser avec un mouvement alternatif entre deux positions extrêmes dans le cylindre. La culasse comprend des moyens d'admission de gaz et d'injection de carburant entre le piston et la culasse. La culasse comprend également des moyens de refoulement du mélange du carburant et des gaz d'admission, après combustion du carburant. Le piston comprend sur une face supérieure orientée vers la culasse une cavité formant une paroi d'une chambre de combustion. An internal combustion engine generally comprises a casing in which at least one cylinder is formed, a cylinder head closing an upper end of the cylinder, and a piston intended to slide with an alternating movement between two extreme positions in the cylinder. The cylinder head comprises means for admitting gas and injecting fuel between the piston and the cylinder head. The cylinder head also comprises means for discharging the mixture of fuel and intake gases, after combustion of the fuel. The piston comprises on a top face oriented towards the cylinder head a cavity forming a wall of a combustion chamber.
On cherche généralement à réduire la consommation en carburant du moteur, et à limiter l'émission de polluants tels que des hydrocarbures imbrûlés. Pour ce faire, on peut améliorer la combustion du carburant en agissant sur la qualité du mélange entre le carburant et les gaz d'admission, en créant entre autre un mélange localement le plus homogène possible. It is generally sought to reduce the fuel consumption of the engine, and to limit the emission of pollutants such as unburnt hydrocarbons. To do this, the combustion of the fuel can be improved by acting on the quality of the mixture between the fuel and the intake gases, by creating, among other things, a mixture that is locally as homogeneous as possible.
Trois phénomènes principaux participent à la formation du mélange carburant/gaz d'admission. L'injection du carburant, permet de pulvériser le carburant en fines gouttelettes dans les gaz d'admission. Plus les gouttelettes sont fines, plus on peut obtenir un mélange localement homogène dans lequel une grande partie du carburant est directement en contact avec les gaz d'admission. L'interaction entre le jet de carburant, le mouvement des gaz d'admission favorise également le mélange. Three main phenomena participate in the formation of the fuel / intake gas mixture. Fuel injection allows the fuel to be sprayed into fine droplets in the intake gases. The finer the droplets, the more a locally homogeneous mixture can be obtained in which a large part of the fuel is directly in contact with the intake gases. The interaction between the fuel jet and the movement of the intake gases also promotes mixing.
L'interaction de ces deux mouvement peut permettre d'éviter qu'une grande quantité de carburant soit projeté contre la surface du piston, ce qui The interaction of these two movements can prevent a large amount of fuel from being projected against the surface of the piston, which
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provoque une mauvaise combustion du mélange et des émissions d'hydrocarbures imbrûlés. causes poor combustion of the mixture and emissions of unburnt hydrocarbons.
Un effet de chasse provoque également des mouvements d'air favorisant le mélange. Le mouvement de chasse est un mouvement d'air entrant ou sortant de la cavité formée sur la face supérieure du piston, lorsque le piston est proche de sa position extrême supérieure, appelée point mort haut, et vient à proximité de la culasse de sorte que le volume de la chambre de combustion est réduit. A flushing effect also causes air movements favoring the mixing. The flushing movement is a movement of air entering or leaving the cavity formed on the upper face of the piston, when the piston is close to its extreme upper position, called top dead center, and comes close to the cylinder head so that the volume of the combustion chamber is reduced.
Ainsi, afin d'améliorer la préparation du mélange entre le carburant et les gaz d'admission, il est souhaitable de créer des turbulence au niveau des jets de carburant afin d'accélérer l'évaporation du carburant et donc de permettre une meilleur utilisation de l'oxygène. Les turbulances sont également favorable au début de la combustion car elles accélèrent la propagation de la flamme. Thus, in order to improve the preparation of the mixture between the fuel and the intake gases, it is desirable to create turbulence at the level of the fuel jets in order to accelerate the evaporation of the fuel and therefore allow better use of oxygen. Turbulence is also favorable at the start of combustion because it accelerates the propagation of the flame.
L'invention propose un piston pour moteur à combustion interne permettant d'améliorer l'utilisation de l'oxygène présent dans le cylindre lors de la combustion de la charge carburée. The invention provides a piston for an internal combustion engine making it possible to improve the use of the oxygen present in the cylinder during the combustion of the carburetted charge.
Ce but est atteint par un piston pour moteur à combustion interne à allumage par compression, le piston étant destiné à coulisser avec un mouvement alternatif dans un cylindre, caractérisé par le fait que le piston comprenant une face supérieure pourvue d'un téton central et d'une pluralité d'alvéoles apte à coopérer à la formation d'une chambre de combustion, chaque alvéole est formée selon un rayon du piston et suit la trajectoire d'un jet de carburant généré par un injecteur. This object is achieved by a piston for an internal combustion engine with compression ignition, the piston being intended to slide with a reciprocating movement in a cylinder, characterized in that the piston comprising an upper face provided with a central stud and d 'A plurality of cells adapted to cooperate in the formation of a combustion chamber, each cell is formed along a radius of the piston and follows the path of a fuel jet generated by an injector.
Selon une autre particularité de l'invention le piston (5) comprenant sur sa face supérieure entre chaque alvéole, un bossage de hauteur déterminée. According to another characteristic of the invention, the piston (5) comprising on its upper face between each cell, a boss of determined height.
L'invention propose également une chambre de combustion pour moteur à allumage par compression comprenant le piston selon l'invention. The invention also provides a combustion chamber for a compression ignition engine comprising the piston according to the invention.
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La présente invention et ses avantages seront mieux compris à l'étude de la description détaillée de modes de réalisation pris à titre d'exemples non-limitatifs et illustrés par les dessins annexés, sur lesquels : - la figure 1 représente une vue en coupe du cylindre d'un moteur, comprenant un piston selon un aspect de l'invention, - la figure 2 représente une vue de dessus du piston selon un aspect de l'invention, - les figures 3A et 3B représentent respectivement une vue selon les coupes AA et BB de la figure 2, - la figure 4 représente une vue selon la coupe CC de la figure 2. The present invention and its advantages will be better understood on studying the detailed description of embodiments taken by way of non-limiting examples and illustrated by the appended drawings, in which: - Figure 1 shows a sectional view of the cylinder of an engine, comprising a piston according to one aspect of the invention, - Figure 2 shows a top view of the piston according to one aspect of the invention, - Figures 3A and 3B respectively show a view according to sections AA and BB of FIG. 2, FIG. 4 represents a view along the section CC of FIG. 2.
Sur la figure 1, un carter de moteur 1 comprend un cylindre 2 pourvu d'un alésage 3 et fermé à une extrémité supérieure par une culasse 4. Un piston 5 coulisse dans l'alésage 3 du cylindre 2, en formant entre la surface supérieure 6 du piston et la culasse 4, une chambre 7. In FIG. 1, a motor casing 1 comprises a cylinder 2 provided with a bore 3 and closed at an upper end by a cylinder head 4. A piston 5 slides in the bore 3 of the cylinder 2, forming between the upper surface 6 of the piston and the cylinder head 4, a chamber 7.
De façon connue en soit, la culasse 4 est dite en toit, c'est-à-dire que la partie supérieure de la chambre 7 délimitée par la culasse 4 est formée de deux plans sécants selon un angle déterminé. In known manner, the cylinder head 4 is said to be a roof, that is to say that the upper part of the chamber 7 delimited by the cylinder head 4 is formed by two planes intersecting at a determined angle.
La culasse 4 comprend des moyens d'admission de gaz d'admission formés par une conduite 8 débouchant dans la chambre 7 par deux ouvertures 9 formées dans un premier plan PI. Chaque ouverture comprend une soupape de commande 10 apte à être actionnée entre une position fermée d'obturation de l'ouverture 9 et une position ouverte d'admission des gaz. La soupape 10 comprend une tige de commande 11 et une tête d'obturation 12 de forme tronconique, dont la surface périphérique inclinée vient en contact avec une surface correspondante de l'ouverture 9 formant siège de soupape pour fermer l'ouverture 9. The cylinder head 4 comprises means for admission of intake gas formed by a pipe 8 opening into the chamber 7 by two openings 9 formed in a first plane PI. Each opening comprises a control valve 10 capable of being actuated between a closed position for closing the opening 9 and an open position for admitting the gases. The valve 10 comprises a control rod 11 and a closure head 12 of frustoconical shape, the inclined peripheral surface of which comes into contact with a corresponding surface of the opening 9 forming a valve seat to close the opening 9.
La culasse 4 comprend des moyens de refoulement formés par une conduite d'échappement 13 débouchant dans la chambre 7 par deux ouvertures 14 formée dans le deuxième plan P2. Chaque ouverture 14 est The cylinder head 4 comprises delivery means formed by an exhaust pipe 13 opening into the chamber 7 through two openings 14 formed in the second plane P2. Each opening 14 is
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apte à être fermée par une soupape de commande 15 comprenant une tige d'actionnement 16 et une tête d'obturation 17. able to be closed by a control valve 15 comprising an actuating rod 16 and a closure head 17.
La culasse 4 comprend également un moyen d'injection de carburant formé par un injecteur 18 placé verticalement et sensiblement au centre de la chambre 7. L'injecteur reçoit à une entrée extérieure le carburant et possède à une extrémité en saillie dans la chambre 7 une tête d'injection 19 apte à pulvériser le carburant sous forme de fines gouttelettes dans la chambre 7 au moment approprié. The cylinder head 4 also comprises a fuel injection means formed by an injector 18 placed vertically and substantially in the center of the chamber 7. The injector receives the fuel at an external inlet and has at one end projecting in the chamber 7 a injection head 19 capable of spraying the fuel in the form of fine droplets into the chamber 7 at the appropriate time.
Lors de la rotation du vilebrequin du moteur, le piston 5 se déplace entre une position de point mort bas éloignée de la culasse 4, et une position de point mort haut proche de la culasse 4. During the rotation of the engine crankshaft, the piston 5 moves between a low neutral position distant from the cylinder head 4, and a high neutral position close to the cylinder head 4.
Le piston 5 comprend une tête 20 dont la surface supérieure 6 forme une paroi de la chambre 7, et une jupe 21 améliorant le guidage du piston en translation dans le cylindre 2. The piston 5 comprises a head 20 whose upper surface 6 forms a wall of the chamber 7, and a skirt 21 improving the guiding of the piston in translation in the cylinder 2.
L'invention va à présent être décrite en détail en référence aux figures 2 à 4. La surface 6 du piston 5 comprend un téton 21 central et une pluralité d'alvéoles 22 formées radialement par rapport au téton 21. Le piston 5 comprend autant d'alvéoles 22 que de jets 30 de carburant produits par l'injecteur 18. Selon les figures l'injecteur 18 utilisé est à trou. The invention will now be described in detail with reference to FIGS. 2 to 4. The surface 6 of the piston 5 comprises a central stud 21 and a plurality of cells 22 formed radially with respect to the stud 21. The piston 5 comprises as many 'cells 22 that jets 30 of fuel produced by the injector 18. According to the figures the injector 18 used has a hole.
La figure 2 représente schématiquement un exemple de réalisation dans lequel l'injecteur 18 est un injecteur à 10 trous. Les traits pointillés représentent l'axe des jets 30 de carburant. FIG. 2 schematically represents an exemplary embodiment in which the injector 18 is a 10-hole injector. The dotted lines represent the axis of the fuel jets 30.
Chaque alvéole 22 a pour fonction notamment de créer des microturbulences au voisinage du jet 30 de carburant favorable à la combustion et à la poste oxydation des suies. Each cell 22 has the function in particular of creating microturbulence in the vicinity of the fuel jet 30 favorable to combustion and to the soot oxidation post.
Chaque alvéole 22 est formée par une cavité qui s'étend selon un rayon du piston 5 en suivant la trajectoire d'un jet 30 de l'injecteur. La section radiale de la cavité est sensiblement en forme de triangle. Le côté du triangle partant du centre du piston est sensiblement parallèle à l'axe médian du jet 30 de carburant tout en tenant compte de l'épanouissement Each cell 22 is formed by a cavity which extends along a radius of the piston 5 along the path of a jet 30 from the injector. The radial section of the cavity is substantially in the shape of a triangle. The side of the triangle starting from the center of the piston is substantially parallel to the median axis of the fuel jet 30 while taking into account the development
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radial du jet. Le côté opposé 222 du triangle rejoint la surface supérieure du piston 5 pour former un évasement par rapport à la périphérie du piston 5. La jonction entre ces deux côtés forme un arrondi. La longueur du premier coté 221 est telle que la zone la plus profonde de la cavité soit située sensiblement dans le tiers extérieur du piston 5. Cette forme d'alvéole 22 permet notamment au carburant vapeur puis aux suies d'être chassés vers le bord 23 du piston 5 et donc d'utiliser l'oxygène présent dans cette zone. radial of the jet. The opposite side 222 of the triangle joins the upper surface of the piston 5 to form a flare with respect to the periphery of the piston 5. The junction between these two sides forms a rounded shape. The length of the first side 221 is such that the deepest zone of the cavity is located substantially in the outer third of the piston 5. This shape of the cell 22 allows in particular the steam fuel and then the soot to be driven towards the edge 23 of the piston 5 and therefore of using the oxygen present in this zone.
La hauteur du téton 21 est déterminée d'une part de façon à réduire la distance entre le nez de l'injecteur 18 et le téton 21 lorsque le piston 5 est au point mort haut et d'autre part pour obtenir le rapport volumétrique, et ainsi le taux de compression, souhaité. The height of the stud 21 is determined on the one hand so as to reduce the distance between the nose of the injector 18 and the stud 21 when the piston 5 is in top dead center and on the other hand to obtain the volumetric ratio, and thus the desired compression ratio.
De même, la profondeur de chaque cavité 22 est choisie par exemple pour préserver une distance de l'ordre de 2mm et par exemple compris entre 1,5 et 2,5mm, entre le fond de la cavité 22 et le jet 30 de carburant. Similarly, the depth of each cavity 22 is chosen for example to preserve a distance of the order of 2mm and for example between 1.5 and 2.5mm, between the bottom of the cavity 22 and the fuel jet 30.
Entre chaque alvéole 22, la surface 6 du piston comprend un bossage 24. Ce bossage 24 a pour fonction de créer des micro-turbulences au voisinage du jet 30 de carburant. Selon le mode de réalisation représenté aux figures, le bossage 24 est centré sensiblement sur le milieu d'un rayon du piston 5. La bossage a par exemple une forme demi-cylindrique donc l'axe en parallèle au rayon. La hauteur du bossage 24 est ajustée de façon à obtenir le taux de compression souhaité. La base du bossage 24 vient se raccorder harmonieusement avec les deux alvéoles 22 adjacentes, avec le bord 23 du piston et avec le téton 21. Between each cell 22, the surface 6 of the piston includes a boss 24. This boss 24 has the function of creating micro-turbulence in the vicinity of the fuel jet 30. According to the embodiment shown in the figures, the boss 24 is centered substantially on the middle of a radius of the piston 5. The boss has for example a semi-cylindrical shape therefore the axis parallel to the radius. The height of the boss 24 is adjusted so as to obtain the desired compression ratio. The base of the boss 24 is connected harmoniously with the two adjacent cells 22, with the edge 23 of the piston and with the stud 21.
Quelle que soit la technologie employée, l'injecteur doit être positionné pour injecter le carburant de façon que chaque jet 30 soit projeté dans l'axe d'une alvéole 22. Whatever the technology used, the injector must be positioned to inject the fuel so that each jet 30 is projected in the axis of a cell 22.
Ainsi, le piston 5 selon l'invention associé à une culasse en toit permet d'une part de favoriser l'homogénéisation de la charge carburée et une meilleure oxydation et donc une diminution des suies. L'utilisation de cette réalisation particulière permet également d'obtenir une longueur Thus, the piston 5 according to the invention associated with a roof cylinder head makes it possible on the one hand to promote the homogenization of the carburetted charge and better oxidation and therefore a reduction in soot. The use of this particular embodiment also makes it possible to obtain a length
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importante pour les jets de carburant avant l'impact sur les parois du piston en conservant un taux de compression élevé. Cette forme de réalisation favorise également l'utilisation de l'oxygène présent en bord de cylindre en favorisant l'évacuation du carburant vapeur puis les suies dans cette zone. important for fuel jets before impact on the piston walls while maintaining a high compression ratio. This embodiment also promotes the use of the oxygen present at the edge of the cylinder by promoting the evacuation of the steam fuel then the soot in this area.
Claims (9)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0200924A FR2835287B1 (en) | 2002-01-25 | 2002-01-25 | PISTON FOR INTERNAL COMBUSTION ENGINE AND ASSOCIATED COMBUSTION CHAMBER |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0200924A FR2835287B1 (en) | 2002-01-25 | 2002-01-25 | PISTON FOR INTERNAL COMBUSTION ENGINE AND ASSOCIATED COMBUSTION CHAMBER |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FR2835287A1 true FR2835287A1 (en) | 2003-08-01 |
| FR2835287B1 FR2835287B1 (en) | 2005-07-01 |
Family
ID=27619658
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR0200924A Expired - Fee Related FR2835287B1 (en) | 2002-01-25 | 2002-01-25 | PISTON FOR INTERNAL COMBUSTION ENGINE AND ASSOCIATED COMBUSTION CHAMBER |
Country Status (1)
| Country | Link |
|---|---|
| FR (1) | FR2835287B1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10254594A1 (en) * | 2002-11-22 | 2004-06-03 | Volkswagen Ag | Profiled top surface of piston for internal combustion engine with direct fuel injection has double depression under injector and has raised rim with peak surrounding outer depression |
| WO2013060497A3 (en) * | 2011-10-28 | 2014-01-16 | Ks Kolbenschmidt Gmbh | Piston and method for producing same |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1081692A (en) * | 1964-01-31 | 1967-08-31 | Giles John George | Improvements in or relating to internal combustion engine combustion chambers |
| JPS578314A (en) * | 1980-06-16 | 1982-01-16 | Mitsubishi Motors Corp | Fuel injection method and combustion chamber of direct injection diesel engine |
| DE3742574C1 (en) * | 1987-12-16 | 1989-03-02 | Mtu Friedrichshafen Gmbh | Internal-combustion engine with a combustion space in the piston head |
| EP0845589A1 (en) * | 1996-11-27 | 1998-06-03 | Mtu Motoren- Und Turbinen-Union Friedrichshafen Gmbh | Direct injection Diesel engine with combustion chamber in piston |
| JPH11117748A (en) * | 1997-10-13 | 1999-04-27 | Isuzu Motors Ltd | Combustion chamber for direct injection type diesel engine |
-
2002
- 2002-01-25 FR FR0200924A patent/FR2835287B1/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1081692A (en) * | 1964-01-31 | 1967-08-31 | Giles John George | Improvements in or relating to internal combustion engine combustion chambers |
| JPS578314A (en) * | 1980-06-16 | 1982-01-16 | Mitsubishi Motors Corp | Fuel injection method and combustion chamber of direct injection diesel engine |
| DE3742574C1 (en) * | 1987-12-16 | 1989-03-02 | Mtu Friedrichshafen Gmbh | Internal-combustion engine with a combustion space in the piston head |
| EP0845589A1 (en) * | 1996-11-27 | 1998-06-03 | Mtu Motoren- Und Turbinen-Union Friedrichshafen Gmbh | Direct injection Diesel engine with combustion chamber in piston |
| JPH11117748A (en) * | 1997-10-13 | 1999-04-27 | Isuzu Motors Ltd | Combustion chamber for direct injection type diesel engine |
Non-Patent Citations (2)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN vol. 006, no. 069 (M - 125) 30 April 1982 (1982-04-30) * |
| PATENT ABSTRACTS OF JAPAN vol. 1999, no. 09 30 July 1999 (1999-07-30) * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10254594A1 (en) * | 2002-11-22 | 2004-06-03 | Volkswagen Ag | Profiled top surface of piston for internal combustion engine with direct fuel injection has double depression under injector and has raised rim with peak surrounding outer depression |
| WO2013060497A3 (en) * | 2011-10-28 | 2014-01-16 | Ks Kolbenschmidt Gmbh | Piston and method for producing same |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2835287B1 (en) | 2005-07-01 |
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