FR2818318A1 - Piston, for direct injection internal combustion engine, has cavity in top face of piston, with cavity wall carrying deflector zones to impart turbulence to whirling motion of injected fuel. - Google Patents
Piston, for direct injection internal combustion engine, has cavity in top face of piston, with cavity wall carrying deflector zones to impart turbulence to whirling motion of injected fuel. Download PDFInfo
- Publication number
- FR2818318A1 FR2818318A1 FR0016558A FR0016558A FR2818318A1 FR 2818318 A1 FR2818318 A1 FR 2818318A1 FR 0016558 A FR0016558 A FR 0016558A FR 0016558 A FR0016558 A FR 0016558A FR 2818318 A1 FR2818318 A1 FR 2818318A1
- Authority
- FR
- France
- Prior art keywords
- piston
- cavity
- combustion chamber
- engine
- wall
- 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
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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
- F02F1/00—Cylinders; Cylinder heads
- F02F1/002—Integrally formed cylinders and cylinder heads
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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
- F02B23/0618—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 having in-cylinder means to influence the charge motion
- F02B23/0624—Swirl flow
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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
- F02B23/0618—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 having in-cylinder means to influence the charge motion
- F02B23/0627—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 having in-cylinder means to influence the charge motion having additional bores or grooves machined into the piston for guiding air or charge flow to the piston bowl
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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
- F02B23/0672—Omega-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 center axis
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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
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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
- F02B23/0645—Details related to the fuel injector or the fuel spray
- F02B23/0648—Means or methods to improve the spray dispersion, evaporation or ignition
-
- 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
- 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
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B31/00—Modifying induction systems for imparting a rotation to the charge in the cylinder
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- 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
Abstract
Description
<Desc/Clms Page number 1> <Desc / Clms Page number 1>
"Piston comportant des rainures en vue de produire des turbulences dans les gaz d'admission"
La présente invention concerne un piston pour un moteur à combustion interne à injection directe. "Piston with grooves for producing turbulence in the intake gases"
The present invention relates to a piston for an internal combustion engine with direct injection.
La présente invention concerne plus particulièrement un piston pour un moteur à combustion interne à injection directe, du type qui coulisse axialement dans un cylindre du moteur en décrivant un mouvement de va-et-vient et qui comporte, dans sa face supérieure, une cavité délimitant la partie inférieure d'une chambre de combustion, qui est délimitée dans sa partie supérieure par la culasse du moteur, du type dans lequel la culasse comporte un circuit d'admission qui communique avec la chambre de combustion au travers d'au moins une soupape d'admission, un circuit d'échappement qui communique avec la chambre de combustion au travers d'au moins une soupape d'échappement, et un injecteur qui injecte le carburant directement vers l'intérieur de la chambre de combustion, et du type dans lequel le moteur comporte des moyens pour animer les gaz d'admission d'un mouvement tourbillonnaire. The present invention relates more particularly to a piston for an internal combustion engine with direct injection, of the type which slides axially in a cylinder of the engine in a reciprocating movement and which comprises, in its upper face, a delimiting cavity the lower part of a combustion chamber, which is delimited in its upper part by the cylinder head of the engine, of the type in which the cylinder head has an intake circuit which communicates with the combustion chamber through at least one valve intake, an exhaust circuit which communicates with the combustion chamber through at least one exhaust valve, and an injector which injects the fuel directly into the interior of the combustion chamber, and of the type in which the engine comprises means for animating the intake gases with a vortex movement.
On cherche généralement à réduire la consommation des moteurs et à réduire l'émission de polluants tels que les particules. It is generally sought to reduce the consumption of engines and to reduce the emission of pollutants such as particles.
De telles améliorations peuvent être obtenues en agissant sur la qualité du mélange entre les gaz d'admission et le carburant, en particulier en réalisant un mélange sensiblement homogène dans lequel les gaz d'admission et le carburant sont répartis sensiblement uniformément. Such improvements can be obtained by acting on the quality of the mixture between the intake gases and the fuel, in particular by producing a substantially homogeneous mixture in which the intake gases and the fuel are distributed substantially uniformly.
Dans le cas d'un moteur à injection directe, trois phénomènes principaux, qui se combinent, permettent d'obtenir un mélange sensiblement homogène : - la pulvérisation du carburant en fines gouttelettes ; - le mouvement tourbillonnaire du type swirl de de la charge de gaz d'admission autour d'un axe sensiblement confondu ou parallèle à l'axe du cylindre ; In the case of a direct injection engine, three main phenomena, which combine, make it possible to obtain a substantially homogeneous mixture: - spraying the fuel into fine droplets; - the swirl movement of the swirl type of the intake gas charge around an axis substantially coincident or parallel to the axis of the cylinder;
<Desc/Clms Page number 2> <Desc / Clms Page number 2>
le mouvement d'air généré par l'injection de carburant ; - l'effet de chasse, dit squish , des gaz d'admission entre la face supérieure du piston et la culasse.
the air movement generated by the fuel injection; - the flushing effect, called squish, of the intake gases between the upper face of the piston and the cylinder head.
En dehors de la pulvérisation qui émane des caractéristiques de l'injection, l'action du mouvement de swirl et l'action de l'effet de chasse ont lieu majoritairement contre la paroi de la partie inférieure de la chambre de combustion. Apart from the spraying which emanates from the characteristics of the injection, the action of the swirl movement and the action of the flushing effect take place mainly against the wall of the lower part of the combustion chamber.
Les conditions aérodynamiques ne permettent d'obtenir un mélange sensiblement homogène que pour les régimes intermédiaires de rotation du moteur, par exemple de l'ordre de 2000 à 2500 tours par minute. The aerodynamic conditions make it possible to obtain a substantially homogeneous mixture only for the intermediate engine rotation regimes, for example of the order of 2000 to 2500 revolutions per minute.
En deçà des régimes intermédiaires, la turbulence est trop faible dans le mouvement aérodynamique des gaz d'admission et il y a un risque d'impact d'un jet de carburant sur la paroi de la chambre de combustion, surtout si on utilise des pressions d'injection élevées. Below intermediate speeds, the turbulence is too weak in the aerodynamic movement of the intake gases and there is a risk of impact of a jet of fuel on the wall of the combustion chamber, especially if pressures are used. high injection rates.
Il en résulte l'émission d'une quantité importante de particules dans les gaz d'échappement. This results in the emission of a significant amount of particles into the exhaust gases.
Au delà des régimes intermédiaires, le mouvement aérodynamique de rotation des gaz d'admission est trop important et il y a un risque de recouvrement du ou des jets de carburant se traduisant aussi par l'émission de particules. Beyond the intermediate speeds, the aerodynamic movement of rotation of the intake gases is too great and there is a risk of overlapping of the fuel jets, also resulting in the emission of particles.
En vue de résoudre ces problèmes, le document EP-A-0. 947.677 a proposé d'agencer sur la paroi de la chambre de combustion, dans la tête du piston, des nervures qui dévient les jets de carburant pour éviter qu'ils ne se recouvrent et pour améliorer la combustion du mélange. In order to solve these problems, document EP-A-0. 947,677 proposed to arrange on the wall of the combustion chamber, in the piston head, ribs which deflect the fuel jets to prevent them from overlapping and to improve the combustion of the mixture.
Cette solution n'est pas entièrement satisfaisante. This solution is not entirely satisfactory.
De plus, elle est difficilement industrialisable et elle pose des problèmes de tenue thermomécanique en raison des fortes contraintes de températures auxquelles est soumise la chambre de combustion. In addition, it is difficult to industrialize and it poses problems of thermomechanical behavior due to the high temperature constraints to which the combustion chamber is subjected.
L'invention vise à remédier à ces inconvénients. The invention aims to remedy these drawbacks.
<Desc/Clms Page number 3> <Desc / Clms Page number 3>
Dans ce but, l'invention propose un piston du type décrit précédemment, caractérisé en ce que la paroi de la cavité comporte au moins une zone provoquant une augmentation des turbulences dans le mouvement tourbillonnaire des gaz d'admission. For this purpose, the invention provides a piston of the type described above, characterized in that the wall of the cavity comprises at least one zone causing an increase in turbulence in the swirling movement of the intake gases.
Selon d'autres caractéristiques de l'invention : - la paroi de la cavité comporte au moins une zone en creux, en vue de créer des turbulences dans le mouvement tourbillonnaire des gaz d'admission ; - pour un piston du type dans lequel la cavité a sensiblement la forme d'un bol qui comporte une gorge annulaire périphérique et un bossage central, la paroi du bossage central comporte au moins une zone en creux ; - chaque zone en creux est une rainure, ou gorge ; - chacune rainure a une orientation sensiblement radiale par rapport à l'axe du piston ; - chaque zone en creux est réalisée par fraisage ; - le nombre de zones en creux est proportionnel au nombre de jets de carburant émis par l'injecteur. According to other characteristics of the invention: - the wall of the cavity comprises at least one hollow area, with a view to creating turbulence in the vortex movement of the intake gases; - For a piston of the type in which the cavity has substantially the shape of a bowl which comprises a peripheral annular groove and a central boss, the wall of the central boss comprises at least one hollow area; - Each recessed area is a groove, or groove; - Each groove has a substantially radial orientation relative to the axis of the piston; - each recessed area is produced by milling; - the number of recessed areas is proportional to the number of fuel jets emitted by the injector.
D'autres caractéristiques et avantages de l'invention apparaîtront à la lecture de la description suivante en référence aux figures annexées, dans lesquelles : - la figure 1 est une vue schématique en coupe axiale qui représente un cylindre comportant un piston conforme aux enseignements de l'invention ; - la figure 2 est une vue en perspective qui représente le piston de la figure 1 ; - la figure 3 est un schéma qui représente l'écoulement des gaz d'admission à proximité de la paroi de la cavité du piston de la figure 1. Other characteristics and advantages of the invention will appear on reading the following description with reference to the appended figures, in which: - Figure 1 is a schematic view in axial section which represents a cylinder comprising a piston in accordance with the teachings of the invention; - Figure 2 is a perspective view which shows the piston of Figure 1; FIG. 3 is a diagram which represents the flow of the intake gases near the wall of the cavity of the piston of FIG. 1.
On a représenté schématiquement sur la figure 1 un cylindre 10 d'axe A-A d'un moteur à combustion interne à injection directe qui comporte un piston 12 réalisé conformément aux enseignements de l'invention. There is shown diagrammatically in FIG. 1 a cylinder 10 of axis A-A of an internal combustion engine with direct injection which comprises a piston 12 produced in accordance with the teachings of the invention.
<Desc/Clms Page number 4> <Desc / Clms Page number 4>
Le piston 12, qui est représenté en perspective sur la figure 2, coulisse axialement dans le cylindre 10 du moteur en décrivant un mouvement de va-et-vient. The piston 12, which is shown in perspective in FIG. 2, slides axially in the cylinder 10 of the engine, describing a back-and-forth movement.
Le piston 12 comporte une tête 14 dans son tronçon supérieur et une jupe axiale 16 dans son tronçon inférieur. The piston 12 has a head 14 in its upper section and an axial skirt 16 in its lower section.
Le piston 12 est relié à une bielle 18 par une articulation 20. The piston 12 is connected to a connecting rod 18 by a hinge 20.
La paroi latérale 22 de la tête 14 comporte des gorges annulaires périphériques 24 qui reçoivent des segments 26. The side wall 22 of the head 14 has peripheral annular grooves 24 which receive segments 26.
Le piston 12 comporte dans sa face supérieure 28 une cavité 30 qui délimite la partie inférieure d'une chambre de combustion 32, qui est délimitée dans sa partie supérieure par la culasse 34 du moteur. The piston 12 has in its upper face 28 a cavity 30 which delimits the lower part of a combustion chamber 32, which is delimited in its upper part by the cylinder head 34 of the engine.
La cavité 32 a sensiblement la forme d'un bol qui comporte une gorge annulaire périphérique 36 et un bossage central 38 ici globalement en forme de calotte sphérique. The cavity 32 has substantially the shape of a bowl which has a peripheral annular groove 36 and a central boss 38 here generally in the form of a spherical cap.
L'invention s'applique aussi à des pistons 12 dans lesquels le bossage central 38 présente une forme différente d'une calotte sphérique, par exemple une forme conique. The invention also applies to pistons 12 in which the central boss 38 has a shape different from a spherical cap, for example a conical shape.
La culasse 34 comporte un circuit d'admission 40 qui communique avec la chambre de combustion 32 au travers d'une soupape d'admission 42, un circuit d'échappement 44 qui communique avec la chambre de combustion 32 au travers d'une soupape d'échappement 46, et un injecteur 48 qui injecte le carburant, sous la forme de jets de fines gouttelettes, directement vers l'intérieur de la chambre de combustion 32. The cylinder head 34 has an intake circuit 40 which communicates with the combustion chamber 32 through an intake valve 42, an exhaust circuit 44 which communicates with the combustion chamber 32 through a valve d exhaust 46, and an injector 48 which injects the fuel, in the form of jets of fine droplets, directly towards the interior of the combustion chamber 32.
Le cylindre 10 comporte des moyens connus pour animer les gaz d'admission d'un mouvement tourbillonnaire du type swirl à l'intérieur de la chambre de combustion 32, par exemple des conduits d'admission 40 équipés de déflecteurs (non représentés). The cylinder 10 comprises known means for animating the intake gases with a swirling movement of the swirl type inside the combustion chamber 32, for example intake ducts 40 fitted with deflectors (not shown).
Conformément aux enseignements de l'invention, la paroi 50 de la cavité 30 comporte des zones 52 qui provoquent une augmentation de la turbulence au passage des gaz d'admission. In accordance with the teachings of the invention, the wall 50 of the cavity 30 includes zones 52 which cause an increase in turbulence when the intake gases pass.
<Desc/Clms Page number 5> <Desc / Clms Page number 5>
Avantageusement, ces zones 52 sont en creux et elles créent des turbulences dans le mouvement tourbillonnaire des gaz d'admission. Advantageously, these zones 52 are hollow and they create turbulence in the vortex movement of the intake gases.
Selon des variantes de réalisation (non représentées), les zones 52 peuvent être constituées de surfaces rugueuses. According to variant embodiments (not shown), the zones 52 may consist of rough surfaces.
Les zones en creux 52 sont ici des rainures, ou gorges, d'orientation radiale par rapport à l'axe A-A, qui sont réalisées par exemple par fraisage dans la calotte sphérique 38. The hollow areas 52 are here grooves, or grooves, of radial orientation with respect to the axis A-A, which are produced for example by milling in the spherical cap 38.
Selon une variante de réalisation de l'invention (non représentée) de l'invention, les zones en creux 52 sont des cavités sensiblement hémisphériques qui sont réalisées dans la paroi 50, par exemple dans la calotte sphérique 38, de manière à présenter un aspect de surface proche de celui d'une balle de golf. According to an alternative embodiment of the invention (not shown) of the invention, the hollow areas 52 are substantially hemispherical cavities which are formed in the wall 50, for example in the spherical cap 38, so as to have an appearance surface close to that of a golf ball.
On a représenté sur la figure 3 l'effet d'une rainure 52 sur l'écoulement des gaz d'admission le long de la paroi 50 de la cavité 30. FIG. 3 shows the effect of a groove 52 on the flow of the inlet gases along the wall 50 of the cavity 30.
L'écoulement des gaz d'admission est symbolisé par des flèches. The flow of intake gases is symbolized by arrows.
On remarque que les gaz d'admissions ont, avant leur passage au-dessus de la rainure 52, une trajectoire sensiblement parallèle à la paroi 50 de la cavité 30. It is noted that the intake gases have, before they pass over the groove 52, a trajectory substantially parallel to the wall 50 of the cavity 30.
Après le passage de la rainure 52, l'écoulement des gaz d'admission est perturbé ce qui facilite la mixtion des gouttelettes de carburant avec les gaz d'admission. After the passage of the groove 52, the flow of the intake gases is disturbed which facilitates the mixing of the fuel droplets with the intake gases.
Avantageusement, le nombre de rainures 52 est proportionnel au nombre de jets de carburant émis par l'injecteur 48. Advantageously, the number of grooves 52 is proportional to the number of fuel jets emitted by the injector 48.
Comme on peut le voir sur la figure 2, la calotte sphérique 38 comporte ici cinq rainures 52 radiales qui sont par exemple agencées respectivement en vis-à-vis de cinq jets de carburant (non représentés) émis par l'injecteur 48. As can be seen in FIG. 2, the spherical cap 38 here comprises five radial grooves 52 which are, for example, respectively arranged opposite five fuel jets (not shown) emitted by the injector 48.
L'agencement des rainures 52 dans la calotte sphérique 38, c'est à dire dans la partie centrale de la cavité 30, permet une The arrangement of the grooves 52 in the spherical cap 38, that is to say in the central part of the cavity 30, allows a
<Desc/Clms Page number 6><Desc / Clms Page number 6>
bonne tenue thermomécanique car la partie centrale de la cavité 30 est celle qui subit le moins de contraintes thermomécaniques. good thermomechanical resistance because the central part of the cavity 30 is that which undergoes the least thermomechanical stresses.
On diminue ainsi les risques d'apparition de fissures dans la tête 14 du piston 12. This reduces the risk of cracks appearing in the head 14 of the piston 12.
L'emplacement et les dimensions des rainures 52 sont choisis notamment en fonction des caractéristiques des jets de carburant, par exemple en fonction de leur orientation, de manière à produire des turbulences dans le mouvement aérodynamique des gaz d'admission qui soient propices à un mélange homogène des gaz d'admission avec le carburant. The location and the dimensions of the grooves 52 are chosen in particular as a function of the characteristics of the fuel jets, for example as a function of their orientation, so as to produce turbulence in the aerodynamic movement of the intake gases which are suitable for mixing homogeneous intake gases with fuel.
La solution proposée par la présente invention est facilement industrialisable puisque les rainures 52 peuvent être réalisées par fraisage. The solution proposed by the present invention is easily industrializable since the grooves 52 can be produced by milling.
Claims (7)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0016558A FR2818318B1 (en) | 2000-12-19 | 2000-12-19 | PISTON COMPRISING GROOVES WITH A VIEW TO PRODUCING TURBULENCE IN THE INTAKE GASES |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0016558A FR2818318B1 (en) | 2000-12-19 | 2000-12-19 | PISTON COMPRISING GROOVES WITH A VIEW TO PRODUCING TURBULENCE IN THE INTAKE GASES |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FR2818318A1 true FR2818318A1 (en) | 2002-06-21 |
| FR2818318B1 FR2818318B1 (en) | 2003-03-21 |
Family
ID=8857845
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR0016558A Expired - Fee Related FR2818318B1 (en) | 2000-12-19 | 2000-12-19 | PISTON COMPRISING GROOVES WITH A VIEW TO PRODUCING TURBULENCE IN THE INTAKE GASES |
Country Status (1)
| Country | Link |
|---|---|
| FR (1) | FR2818318B1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2880384A1 (en) * | 2004-12-30 | 2006-07-07 | Renault Sas | Direct injection type internal combustion engine for motor vehicle, has boss with hollowed zone defined by concave surface extending on angular sector corresponding to that of injection layer comprising unbalanced jets of shorter length |
| FR2895019A1 (en) * | 2005-12-16 | 2007-06-22 | Renault Sas | Combustion chamber for e.g. common rail type direct injection diesel engine, has cylinder with piston having bowl with three recesses whose depth and orientation are defined, based on distance between nozzle and elevated part of bowl`s boss |
| US11293374B2 (en) * | 2020-07-31 | 2022-04-05 | Fev Gmbh | Piston bowl geometries for internal combustion engines |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3742574C1 (en) * | 1987-12-16 | 1989-03-02 | Mtu Friedrichshafen Gmbh | Internal-combustion engine with a combustion space in the piston head |
| US5215052A (en) * | 1991-08-21 | 1993-06-01 | Mercedes-Benz Ag | Internal-combustion engine with predominantly swirl-free air inflow into a shallow combustion space |
| JPH05141246A (en) * | 1991-11-18 | 1993-06-08 | Hino Motors Ltd | Piston for direct injection diesel engine |
| EP0947677A1 (en) | 1998-03-31 | 1999-10-06 | Renault | Combustion chamber and internal combustion engine |
-
2000
- 2000-12-19 FR FR0016558A patent/FR2818318B1/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3742574C1 (en) * | 1987-12-16 | 1989-03-02 | Mtu Friedrichshafen Gmbh | Internal-combustion engine with a combustion space in the piston head |
| US5215052A (en) * | 1991-08-21 | 1993-06-01 | Mercedes-Benz Ag | Internal-combustion engine with predominantly swirl-free air inflow into a shallow combustion space |
| JPH05141246A (en) * | 1991-11-18 | 1993-06-08 | Hino Motors Ltd | Piston for direct injection diesel engine |
| EP0947677A1 (en) | 1998-03-31 | 1999-10-06 | Renault | Combustion chamber and internal combustion engine |
Non-Patent Citations (1)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN vol. 017, no. 530 (M - 1485) 24 September 1993 (1993-09-24) * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2880384A1 (en) * | 2004-12-30 | 2006-07-07 | Renault Sas | Direct injection type internal combustion engine for motor vehicle, has boss with hollowed zone defined by concave surface extending on angular sector corresponding to that of injection layer comprising unbalanced jets of shorter length |
| EP1683950A1 (en) * | 2004-12-30 | 2006-07-26 | Renault | Internal combustion engine having a piston with projection in the combustion bowl foreseen with a deepened zone |
| FR2895019A1 (en) * | 2005-12-16 | 2007-06-22 | Renault Sas | Combustion chamber for e.g. common rail type direct injection diesel engine, has cylinder with piston having bowl with three recesses whose depth and orientation are defined, based on distance between nozzle and elevated part of bowl`s boss |
| US11293374B2 (en) * | 2020-07-31 | 2022-04-05 | Fev Gmbh | Piston bowl geometries for internal combustion engines |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2818318B1 (en) | 2003-03-21 |
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