FR2859245A1 - Piston for internal combustion engine, has lip provided only in one portion of bowl and comprising return profile that permits to guide combustion fuel towards bottom of bowl along contour of bowl - Google Patents

Piston for internal combustion engine, has lip provided only in one portion of bowl and comprising return profile that permits to guide combustion fuel towards bottom of bowl along contour of bowl Download PDF

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Publication number
FR2859245A1
FR2859245A1 FR0350464A FR0350464A FR2859245A1 FR 2859245 A1 FR2859245 A1 FR 2859245A1 FR 0350464 A FR0350464 A FR 0350464A FR 0350464 A FR0350464 A FR 0350464A FR 2859245 A1 FR2859245 A1 FR 2859245A1
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FR
France
Prior art keywords
bowl
piston
lip
combustion
permits
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
FR0350464A
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French (fr)
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FR2859245B1 (en
Inventor
Noboyuki Sakushima
Magali Besson
Mathieu Truant
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.)
Renault SAS
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Renault SAS
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Publication date
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Priority to FR0350464A priority Critical patent/FR2859245B1/en
Publication of FR2859245A1 publication Critical patent/FR2859245A1/en
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Publication of FR2859245B1 publication Critical patent/FR2859245B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F02B23/0651—Means or methods to improve the spray dispersion, evaporation or ignition the fuel spray impinging on reflecting surfaces or being specially guided throughout the combustion space
    • 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
    • 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
    • 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
    • F02F3/00—Pistons 
    • F02F3/26—Pistons  having combustion chamber in piston head
    • 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
    • F02B23/0621—Squish flow
    • 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
    • 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

The piston (5) has a cavity in the form of a bowl (50) comprising portions (51, 52). A lip is provided only in the portion (51) and has return profile that permits to guide combustion fuel towards bottom of the bowl along the contour of the bowl. The lip serves as an obstacle during the extraction of products resulting from combustion towards a flushing zone.

Description

Piston pour moteur à combustion interne à allumage par compressionPiston for internal combustion engine with compression ignition

La présente invention concerne un piston de moteur à combustion interne, et plus particulièrement une chambre de combustion pour moteur à allumage par compression.  The present invention relates to an internal combustion engine piston, and more particularly to a combustion chamber 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 lo 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. Pour un moteur à allumage par compression, le piston comprend le plus souvent sur une face supérieure orientée vers la culasse une cavité le plus souvent en forme de bol formant une paroi d'une chambre de combustion.  An internal combustion engine generally comprises a housing in which is formed at least one cylinder, a cylinder head closing lo an upper end of the cylinder, and a piston for sliding with reciprocating motion between two extreme positions in the cylinder. The cylinder head comprises means of gas admission and fuel injection between the piston and the cylinder head. The cylinder head also comprises means for displacing the mixture of the fuel and the intake gases, after combustion of the fuel. For a compression ignition engine, the piston most often comprises on an upper face facing the cylinder head a cavity usually bowl-shaped 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 unburned hydrocarbons. To do this, we can improve the fuel combustion by acting on the quality of the mixture between the fuel and the intake gases, creating among others a mixture locally as homogeneous as possible.

On cherche également à améliorer l'extraction des gaz brûlés pour améliorer la combustion de la charge.  It also seeks to improve the extraction of flue gas to improve the combustion of the load.

L'invention propose un piston pour moteur à combustion interne permettant d'améliorer la combustion de la charge carburée.  The invention provides a piston for an internal combustion engine to improve the combustion of the fuel load.

Ce but est atteint par un piston comprenant, sur sa face supérieure, une cavité en forme de bol caractérisé en ce que le bol comprend une première portion de sa périphérie ayant une lèvre à profil ré-entrant et au moins une deuxième portion de sa périphérie ne comportant pas de lèvre.  This object is achieved by a piston comprising, on its upper face, a bowl-shaped cavity characterized in that the bowl comprises a first portion of its periphery having a re-entrant profile lip and at least a second portion of its periphery. not having a lip.

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 io - la figure 1 représente une vue en coupe du cylindre d'un moteur, comprenant une chambre de combustion 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 une vue en coupe 15 respectivement des coupes AA et BB 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 accompanying drawings, in which - Figure 1 represents a sectional view of The invention relates to a cylinder of an engine comprising a combustion chamber according to one aspect of the invention; FIG. 2 shows a top view of the piston according to one aspect of the invention; FIGS. 3A and 3B show a sectional view respectively; sections AA and BB of FIG.

Sur la figure 1, un carter de moteur 1 comprend au moins un cylindre 2 formé d'un alésage et fermé à une extrémité supérieure par une culasse 4. Un piston 5 coulisse dans l'alésage du cylindre 2, en formant entre la surface supérieure 6 du piston et la culasse 4, une chambre 7 de combustion.  In Figure 1, a motor casing 1 comprises at least one cylinder 2 formed of a bore and closed at an upper end by a cylinder head 4. A piston 5 slides in the bore of the cylinder 2, forming between the upper surface 6 of the piston and the cylinder head 4, a combustion chamber 7.

La culasse 4 comprend des moyens d'admission de gaz d'admission formés par une conduite débouchant dans la chambre 7 par exemple par deux ouvertures (non représentées). De même, la culasse 4 comprend des moyens de refoulement formés par une conduite d'échappement débouchant dans la chambre 7 par exemple par deux ouvertures (non représentées). Chaque ouverture échappement ou admission est apte à être fermée par une soupape de commande.  The yoke 4 comprises admission gas intake means formed by a pipe opening into the chamber 7 for example by two openings (not shown). Similarly, the yoke 4 comprises discharge means formed by an exhaust pipe opening into the chamber 7 for example by two openings (not shown). Each exhaust opening or admission is able to be closed by a control valve.

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 d'une pluralité de jet de fines gouttelettes dans la chambre 7 au moment approprié.  The yoke 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 at an external inlet the fuel and has at a projecting end in the chamber 7 a injection head 19 adapted to spray the fuel in the form of a plurality of jet of fine droplets in 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 rotation of the crankshaft of the engine, the piston 5 moves between a low dead position remote from the cylinder head 4, and a top dead center position close to the cylinder head 4.

io 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 3.  The invention will now be described in detail with reference to FIGS. 2 to 3.

Selon l'invention, le piston 5 comprend une cavité 50 en forme de bol. Le fond du bol 50 comprend un téton central 30 dont la hauteur permet d'ajuster le taux de compression. Selon l'invention, la périphérie ou le bord extérieur du bol 50 comprend au moins une première portion 51 comprenant une lèvre 510 à profil ré-entrant et au moins une deuxième portion 52 ne comportant pas de lèvre.  According to the invention, the piston 5 comprises a cavity 50 in the shape of a bowl. The bottom of the bowl 50 comprises a central pin 30 whose height makes it possible to adjust the compression ratio. According to the invention, the periphery or the outer edge of the bowl 50 comprises at least a first portion 51 comprising a lip 510 of re-entrant profile and at least a second portion 52 having no lip.

Le profil ré-entrant de la lèvre 510 formant chaque première portion 51 permet de guider la combustion vers le fond du bol 50 en suivant le contour du bol, comme indiqué par la flèche FI. Ainsi, l'oxygène présent dans le fond du bol est utilisé lors de la combustion ce qui améliore la qualité de la combustion en diminuant la formation de fumée. Par contre, le profil ré-entrant de la lèvre 510 constitue un obstacle lors de l'extraction des produits résultants de la combustion vers la zone de chasse 40 située entre la surface 6 supérieure du piston 5 et la culasse 4 au voisinage du pont mort haut. En effet, une partie de la combustion reste piégée sous la lèvre 510.  The re-entrant profile of the lip 510 forming each first portion 51 guides the combustion to the bottom of the bowl 50 following the contour of the bowl, as indicated by the arrow FI. Thus, the oxygen present in the bottom of the bowl is used during combustion which improves the quality of combustion by reducing the formation of smoke. On the other hand, the re-entrant profile of the lip 510 constitutes an obstacle during the extraction of the products resulting from the combustion towards the hunting zone 40 located between the upper surface 6 of the piston 5 and the yoke 4 in the vicinity of the dead bridge. high. Indeed, part of the combustion remains trapped under the lip 510.

L'absence de lèvre de chaque deuxième portion 52 permet au contraire de favoriser l'extraction de la combustion vers la zone de chasse 40 et donc diminuer la production de polluant. L'extraction des produits de combustion se fait du fond du bol 50 vers la culasse 4 en suivant le contour du bol comme indiqué par la flèche F2.  The absence of lip of each second portion 52 allows on the contrary to promote the extraction of combustion to the hunting zone 40 and thus reduce the production of pollutant. The extraction of the combustion products is from the bottom of the bowl 50 to the cylinder head 4 following the outline of the bowl as indicated by the arrow F2.

Selon une variante de réalisation de l'invention, le profil de chaque deuxième portion 52 est évasée et forme un angle compris entre io 0 et 10 avec l'axe du cylindre.  According to an alternative embodiment of the invention, the profile of each second portion 52 is flared and forms an angle between 0 and 10 with the axis of the cylinder.

Comme expliqué précédemment, un profil ré-entrant de lèvre 510 permet le guidage de la combustion vers le fond du bol. Ainsi, dans une variante de réalisation les premières portions 51 de la périphérie du bol 50 à profil de lèvre ré-entrant seront préférentiellement placées en face d'un jet de carburant. Tous les jets de carburant de l'injecteur peut être également dans l'axe d'une première portion. Cependant, il n'est pas nécessaire que l'axe du jet de carburant passe par le milieu d'une première portion.  As explained above, a re-entrant lip profile 510 allows the guiding of the combustion towards the bottom of the bowl. Thus, in an alternative embodiment, the first portions 51 of the periphery of the bowl 50 having a re-entrant lip profile will preferably be placed in front of a fuel jet. All the fuel jets of the injector may also be in the axis of a first portion. However, it is not necessary for the axis of the fuel jet to pass through the middle of a first portion.

Ainsi, le piston selon l'invention permet de s'affranchir, au moins en partie du compromis à trouver entre une forme de lèvre prononcée pour assurer un guidage optimal de la combustion et un bord de bol évasé assurant une bonne évacuation.  Thus, the piston according to the invention makes it possible to overcome, at least in part the compromise to be found between a pronounced lip shape to ensure optimal guidance of combustion and a flared bowl edge ensuring good evacuation.

Le processus de combustion régnant dans une chambre de combustion utilisant le piston selon l'invention est le suivant.  The combustion process prevailing in a combustion chamber using the piston according to the invention is as follows.

Le jet de carburant 10 est dirigé vers une portion 51 à profil de lèvre ré-entrant. La combustion est donc guidée vers le fond du bol. Ensuite lors de la descente du piston, la présence des portions 52 à lèvre évasée permettant à la combustion de s'extraire du bol 50 vers la zone de chasse de part et d'autre des portions à profil de lèvre ré-entrant.  The fuel jet 10 is directed towards a portion 51 with a re-entrant lip profile. The combustion is thus guided towards the bottom of the bowl. Then during the descent of the piston, the presence of flared lip portions 52 allowing combustion to be extracted from the bowl 50 to the flush zone on either side of the re-entrant lip profile portions.

De plus, la jonction entre une première portion 51 à lèvre à profile réentrant et une deuxième portion 52 à profil évasé crée des zones de turbulences qui favorisent également l'homogénéisation du mélange.  In addition, the junction between a first portion 51 with a lip with a reentrant profile and a second portion 52 with a flared profile creates zones of turbulence which also promote the homogenization of the mixture.

Claims (1)

6 REVENDICATIONS6 claims 1. Piston (5) destiné à coulisser avec un mouvement alternatif dans un cylindre (2) d'un moteur (1) à combustion interne à allumage par compression, le piston (5) comprenant, sur sa face supérieure (6), une cavité (50) en forme de bol caractérisé en ce que le bol (50) comprend une première portion (51) de sa périphérie ayant une lèvre (510) à profil réentrant et au moins une deuxième portion (52) de sa périphérie ne comportant pas de lèvre.  Piston (5) intended to reciprocably slide in a cylinder (2) of a compression-ignition internal combustion engine (1), the piston (5) comprising, on its upper face (6), a bowl-shaped cavity (50) characterized in that the bowl (50) comprises a first portion (51) of its periphery having a lip (510) with a reentrant profile and at least a second portion (52) of its periphery having no no lip. io 2. Piston selon la revendication 1, caractérisée en ce que le profil de la deuxième portion (52) de la périphérie du bol est évasée et forme un angle compris entre 0 et 10 avec l'axe du cylindre (2) . 3. Piston selon l'une des revendications 1 à 3 caractérisée en ce que chaque première portion (51) de la périphérie du bol (50) est située sensiblement dans l'axe d'un jet (10) de carburant produit par un injecteur (18) implanté sensiblement selon l'axe du cylindre (2).  2. Piston according to claim 1, characterized in that the profile of the second portion (52) of the periphery of the bowl is flared and forms an angle between 0 and 10 with the axis of the cylinder (2). 3. Piston according to one of claims 1 to 3 characterized in that each first portion (51) of the periphery of the bowl (50) is located substantially in the axis of a jet (10) of fuel produced by an injector (18) implanted substantially along the axis of the cylinder (2). 4. Piston selon la revendication 3 caractérisée en ce que chaque jet de carburant (10) est orienté vers une première portion (51) de la périphérie du bol (50).  4. Piston according to claim 3 characterized in that each fuel jet (10) is oriented towards a first portion (51) of the periphery of the bowl (50).
FR0350464A 2003-08-28 2003-08-28 PISTON FOR INTERNAL COMBUSTION ENGINE WITH COMPRESSION IGNITION Expired - Lifetime FR2859245B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR0350464A FR2859245B1 (en) 2003-08-28 2003-08-28 PISTON FOR INTERNAL COMBUSTION ENGINE WITH COMPRESSION IGNITION

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Application Number Priority Date Filing Date Title
FR0350464A FR2859245B1 (en) 2003-08-28 2003-08-28 PISTON FOR INTERNAL COMBUSTION ENGINE WITH COMPRESSION IGNITION

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FR2859245A1 true FR2859245A1 (en) 2005-03-04
FR2859245B1 FR2859245B1 (en) 2007-07-20

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012010274A1 (en) * 2010-07-19 2012-01-26 Mtu Friedrichshafen Gmbh Piston for internal combustion engines, and internal combustion engine therefor

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63105225A (en) * 1986-10-23 1988-05-10 Isuzu Motors Ltd Structure of combustion chamber for direct injection type diesel engine
JPH108966A (en) * 1996-06-24 1998-01-13 Nissan Motor Co Ltd Combustion chamber structure for direct injection diesel engine
FR2756589A1 (en) * 1996-12-02 1998-06-05 Inst Francais Du Petrole Direct injection compression ignition internal combustion engine
JP2000274247A (en) * 1999-03-19 2000-10-03 Toyota Motor Corp Diesel engine
JP2002285848A (en) * 2001-03-23 2002-10-03 Kubota Corp Direct injection type combustion chamber for diesel engine
JP2003172144A (en) * 2001-12-05 2003-06-20 Komatsu Ltd Diesel engine and combustion method for diesel engine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63105225A (en) * 1986-10-23 1988-05-10 Isuzu Motors Ltd Structure of combustion chamber for direct injection type diesel engine
JPH108966A (en) * 1996-06-24 1998-01-13 Nissan Motor Co Ltd Combustion chamber structure for direct injection diesel engine
FR2756589A1 (en) * 1996-12-02 1998-06-05 Inst Francais Du Petrole Direct injection compression ignition internal combustion engine
JP2000274247A (en) * 1999-03-19 2000-10-03 Toyota Motor Corp Diesel engine
JP2002285848A (en) * 2001-03-23 2002-10-03 Kubota Corp Direct injection type combustion chamber for diesel engine
JP2003172144A (en) * 2001-12-05 2003-06-20 Komatsu Ltd Diesel engine and combustion method for diesel engine

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 0123, no. 46 (M - 742) 16 September 1988 (1988-09-16) *
PATENT ABSTRACTS OF JAPAN vol. 1998, no. 05 30 April 1998 (1998-04-30) *
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 13 5 February 2001 (2001-02-05) *
PATENT ABSTRACTS OF JAPAN vol. 2003, no. 02 5 February 2003 (2003-02-05) *
PATENT ABSTRACTS OF JAPAN vol. 2003, no. 10 8 October 2003 (2003-10-08) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012010274A1 (en) * 2010-07-19 2012-01-26 Mtu Friedrichshafen Gmbh Piston for internal combustion engines, and internal combustion engine therefor

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