BE390923A - - Google Patents

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Publication number
BE390923A
BE390923A BE390923DA BE390923A BE 390923 A BE390923 A BE 390923A BE 390923D A BE390923D A BE 390923DA BE 390923 A BE390923 A BE 390923A
Authority
BE
Belgium
Prior art keywords
cavity
engines
injector
jet
well
Prior art date
Application number
Other languages
French (fr)
Publication of BE390923A publication Critical patent/BE390923A/fr

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B23/00Other engines characterised by special shape or construction of combustion chambers to improve operation
    • F02B23/02Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
    • F02B23/06Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
    • F02B23/0603Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston at least part of the interior volume or the wall of the combustion space being made of material different from the surrounding piston part, e.g. combustion space formed within a ceramic part fixed to a metal piston head
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B23/00Other engines characterised by special shape or construction of combustion chambers to improve operation
    • F02B23/02Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
    • F02B23/06Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
    • F02B23/0678Unconventional, 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B23/00Other engines characterised by special shape or construction of combustion chambers to improve operation
    • F02B23/02Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
    • F02B23/06Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
    • F02B23/0618Other 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
    • F02B23/063Other 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 the combustion space in the piston interacting fluid dynamically with the cylinder head, the injector body or the cylinder wall
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/10Internal combustion engine [ICE] based vehicles
    • Y02T10/12Improving ICE efficiencies

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Combustion Methods Of Internal-Combustion Engines (AREA)

Description

       

   <Desc/Clms Page number 1> 
 
 EMI1.1 
 



  1R.U'.T D'INTENTION. 



  " Perfectionnements apportés aux moteurs à. combustion interne, 
 EMI1.2 
 ,",zent à ceux à deux tempa ". 
 EMI1.3 
 It.u LJ:i 10111 1W IEUR:l, 
L'invention est relative aux moteurs à, combustion- interne; et elle concerne plus particulièrement, parce que   c'est   en leur cas que son application semble devoir offrir le 'plus d'intérêt, mais non exclusivement, parmi ces engins, les moteurs à deux temps. 



   Elle a pour but, surtout, de rendre tels, lesdits en- gins, qu'ils répondent, mieux que jusqu'à présent, aux   deside-   rata de la pratique. 



   Elle consiste, principalement et en   marne   temps qu'à donner à la chambre de compression des moteurs du genre' en question, une lorme telle qu'elle comporte une cavité tournant son ouverture vers le nez de l'injecteur à donner 
 EMI1.4 
 à ladite cavité une :Lorû.e et des dimenaiona telles qu'elle enveloppe le jet de l'injecteur et que sa profondeur dans le, sens du jet soit au moins égale à trois :Lois sa largeur moyen- ne mesurée perpendiculairement à ladite prolondeur. 

 <Desc/Clms Page number 2> 

 



   Elle consiste, mise à part cette disposition princi- pale, en certaines autres dispositions, qui s'utilisent de préférence en   même   temps et dont il sera plus explicitement parlé ci-après. 



   Elle vise plus particulièrement un certain mode d'ap-   plication,   ainsi que certains modes de réalisation, desdites dispositions; et elle vise plus particulièrement encore, et ce à titre de produits industriels nouveaux, les moteurs du genre en question comportant application   desdites   dispositions, les éléments spéciaux propres à leur établissement, ainsi que les ensembles,   fixes.   ou mobiles, comportait de tels moteurs. 



   Et elle pourra, de toute   façon,   être bien comprise à.   l'aide   du   complément'de.description   qui suit, ainsi que du dessin ci-annexé, lesquels complément et dessin sont, bien en- tendu, donnés. surtout à titre d'indication. 



   La figure unique, que comporte   cedessin,   montre, en coupe axiale, la partie supérieure de l'ensemble cylindre-pis- ton d'un moteur à combustion interne établi conformément à l'invention. selon l'invention, et plus particulièrement selon ce- lui. de ses. modes d'application, ainsi que ceux des modes de ré- alisation de ses   d-iverses   parties, auxquels il semble   qu'il   y ait lieu d'accorder la   préférence,   se proposant d'établir un moteur à combustion .interne, on s'y prend comme suit, ou de façon   analogue.        



   On constitue l'ensemble de ce moteur, à   l'exception.   de sa chambre de compression, de n'importe quelle façon- ap- propriée par exemple en ayant recours, à l'un des modes de réa-   liaation   usuellement adoptée. 



   En ce qui concerne maintenant ladite chambre de com-   pression.,   on lui fait comporter une cavité, tournant son   ouver.,;        ture vera le   nez   de l'injecteur. cavité à ,laquelle on donne une   @   forme et des. dimensions telles qu'elle enveloppe,   le', jet   de l'injecteur et que sa profondeur, dans le sens du jet, soit 'au 

 <Desc/Clms Page number 3> 

 
 EMI3.1 
 jl0 '.n6 égale à trois lois s largeur moyenne mesurée, pe.rpe'n#jje-'J... lairement 2. ladite profondeur;' un iorme qui semble partiju- lierement lavorable étant celle d'un iuse2u de ré'IIolutio'ri De prélérence on donne à la susdite cavité une p;co- rondeur suirisnte pour que, au moment de 1 t inje c td:

  an, t puisse se développer librement dans son intérieur, et que, en pratique, tout le combustible soit brûlé avant d'avoir'la temps d'atteindre le rond de ladite cavité. En d'autrea termes', la cavité -présente alors une larme telle que le jet n'ateiri.t.ni ses parois latérales ni son land. Il brûle dans   l'air     ambiant''   sans rencontrer des parois métalliques, 
 EMI3.2 
 Bien entendu, l'injecteur étant porté par lacï.se on peut raire porter la susdite cavité soit par la culasse",* soit par le piston.

   De toute leçon, on conçoit que 1:é"pi',cito'n;" en remontant, lorcerp l' air qu'il comprime à a'engouiïrer dans. ladite cavité, pendant le temps ou l'injection se'prodtl::t,t,,'e<n;' pénétrant par l'ouverture laisnt lace au nez de lrinj#teu Uet air "accornpagne" alors le jet de combustible 1aciH.-c.ant ainsi la combustion complète de toutes ses particules, 
De   prél'érence,   cependant, ori fera porter   la'.susdite-     @   cavité par le rond du piston du moteur.

   
 EMI3.3 
 un a alors avantageusement recours à une'dipo6i- tion selon laquelle, d'une part, on lait comporter audit fond de piston la cavité a que l'on termine par un col b faisant 
 EMI3.4 
 ssillie par rapport au iond de piston proprement dit a, et, d'autre part, on munit la culasse d'un   logenient d   au fond   du'/   quel on dispose l'injecteur e, lesdits col et logement   élan'!:'   tels que le premier pénètre dans le second lorsque le piston - se   rapproche   de son point mort haut et qu'alors l'ouverture dudit col se trouve en regard du nez de   1+injecteur.   un dispose la cavité selon l'axe du piston, ce qui conduit à disposer, d'une part, le   logement b,   et,' d'autre part, l'injecteur e selon   1'axe   de la culasse. 
 EMI3.5 
 iv::::

  nt!3'geu5eLlent, on donne, aux Parois. externes de. 

 <Desc/Clms Page number 4> 

 l'espèce de   buse 1   délimitant le col b et, d'autre port, aux 
 EMI4.1 
 parois internes du loger.:ent d des formes correspondantes (par exemple u.e forme de t-one de cône à angle au sonnet de quel- ques degrés seulement) telles que l'emboîtement se produise avec un jeu très réduit (de, par'exemple   encore, 2   millimètres pour un moteur de 100 millimètres d'alésage). De même on pré- voit que la buse f pénètre aoit   jusqu'au   fond du logement d, 
 EMI4.2 
 soi seulement jusqu'à une traction de la pro:tondeur de ce dernier. 



  Avantageus.ement encore, on donne à la saillie que lait la bu>e 1 par rapport a.u tond du piston une 10n1$1.1eU1' égale à une   iraction   importante de l'alésage, par exemple égale à la moitié de ce dernier. La longueur de ladite buse peut   4.lors   être, dans ce cas particulier, sensiblement égale à la moitié 
 EMI4.3 
 de la prol:ordeur tot'ale de la chambre ¯. r:ni:in, de préférence, on donne à Io partie périphé- rique du tond de piston qui entoure la buse Lune   torme   bombée, 
 EMI4.4 
 par exemple une Lorme tronconique é-viBee, la zone périphérique eorrexponàanie de la culasse étant avantageusement alors façon- née selon une forme correspondante et seraccordant avec les bords du logement d. 



   Grâce à la protubérance que constitue la. buée f, on conçoit que, lorsque le piston remonte, et que cette   protubé-     rahce   commence à s'engager dans le logement d, l'air compris entre la partie périphérique du lond de piston et la, zone péri- phérique de la culasse se trouve   refoule   entre les parois de la   buse ±   et celles du logement d, lesquelles parois vont en ae rapprochant de plus en plus, si leur forme est tronconique, au fur et à mesure que le piston se rapproche de son paint mort haut. 



   L'air est alors violemment projeté contre le fond 
 EMI4.5 
 dudit logement et ee trouve''Lorcé de s'engouffrer dnns la ch8m- bre a en même temps que l'injection se produit. fl y aura d'ailleurs, intérêt à donner au. susdit tond une forme telle que 

 <Desc/Clms Page number 5> 

 lecourant d'air arrivant à sa périphérie soit défléchi pour      être renvoyé vers le bas s.elon l'axe du logement b. Une forme appropriée à cet eliet est celle en tranche de tore montée sur le dessin.. 



   Ainsi que déjà dit, l'air ainsi projeté vers la ca- vité a "accompagne" alors le jet de combustible dont la com-   bustion   se produit dans les meilleures conditions. Le mélange encore en combustion. qui ressort brusquement de la   cavité 111   vient ensuite se  mélanger  à l'air irais contenu dans la zone périphérique de la chambre de combustion. L'air   comprimé   se trouve ainsi utilisé au   maximum..   



   Bien entendu, la cavité a sera, de préférence, faite solidaire du fond de piston c, ce dernier pouvant être indépen- dont des parois latérales du piston et fixé à ces dernières, par tous moyens appropriés. 



   De même, afin de permettre aux parois du logement d, voire aux autres parties de la culasse,   d'atteindre   une tempe-* rature élevée (une température de l'ordre de 200  ayant été re- connue favorable à un bon ionctionnement), on privera ces pa- rois- de moyens de fefroidissement,par exemple en les isolant de la circulation d'eau du moteur, laquelle refroidira de la manière usuelle les parois du cylindre ainsi que la partie de la culasse portant l'injecteur e, 
Enfin, eventuellement, on   ménager?   des passages g (indiqués en pointillé sur le dessin) traversant les parois de la cavité a et débouchant dans les parties de la. chambre de compression extérieures cette cavité.

   Si, ainsi qu'il semble avantageux de le faire et ainsi qu'il a été représenté sur le dessin, ces passages sont situés vers la moitié de la profon- deur de la cavité, ils permettront le passage direct du mélan- ge en combustion vers les parties périphériques- de la chambre de combustion, parties ou se trouve emmagasiné de l'air   frais..,   
En suite de quoi on obtient, dans tous les cas., un moteur dont le   i:iode   de fonctionnement ressort suffisamment de 

 <Desc/Clms Page number 6> 

 ce qui précède pour   qu'il   soit inutile d'entrer à son. sujet dans aucune explication supplémentaire.

   Ce moteur présente, sur ceux. déjà. existants,dans lesquels la proiondeur de la ca- vité dans laquelle est dirigée, le jet de combustible est moins grande, entre autres avantagea, celui de ne pas soumettre le mélange à une   turbulenc-e   tourbillonnante amenant les   particu-   les au contact de parois très chaudes, cette particularité désavantageuse rapprochant   lesaits   moteurs déjà existants de ceux à boule chaude ou Semi-Diesel. 



   Comme il va de soi, et comme il ressort d'ailleurs déjà de ce qui précède, l'invention ne se limite aucunement à celui des modes. d'application non plus qu'à ceux des modes de réalisation ayant plus spécialement été envisagés; elle en embrasse,   au.   contraire, toutes les variantes.



   <Desc / Clms Page number 1>
 
 EMI1.1
 



  1R.U'.T OF INTENT.



  "Improvements made to internal combustion engines,
 EMI1.2
 , ", zent to those with two tempa".
 EMI1.3
 It.u LJ: i 10111 1W IEUR: l,
The invention relates to internal combustion engines; and it concerns more particularly, because it is in their case that its application seems to offer the most interest, but not exclusively, among these machines, two-stroke engines.



   Its aim, above all, is to make the said devices such that they respond better than hitherto to the requirements of practice.



   It consists, mainly and in time to give the compression chamber of engines of the type in question, a shape such that it has a cavity turning its opening towards the nose of the injector to give
 EMI1.4
 to said cavity one: Lorû.e and dimensions such that it envelops the jet of the injector and that its depth in the direction of the jet is at least equal to three: Laws its mean width measured perpendicular to said extension .

 <Desc / Clms Page number 2>

 



   It consists, apart from this main provision, of certain other provisions, which are preferably used at the same time and which will be discussed more explicitly below.



   It relates more particularly to a certain mode of application, as well as certain embodiments, of said provisions; and it relates more particularly still, and this as new industrial products, the engines of the type in question comprising application of the said provisions, the special elements specific to their establishment, as well as the fixed assemblies. or mobile, included such engines.



   And it can, in any case, be well understood at. the aid of the complement'de.description which follows, as well as of the appended drawing, which supplement and drawing are, of course, given. especially as an indication.



   The single figure, included in this drawing, shows, in axial section, the upper part of the cylinder-piston assembly of an internal combustion engine constructed in accordance with the invention. according to the invention, and more particularly according to it. of its. modes of application, as well as those of the embodiments of its various parts, to which it seems that preference should be given, proposing to establish an internal combustion engine, we are 'takes as follows, or analogously.



   We constitute the whole of this engine, with the exception. of its compression chamber, in any suitable way, for example by resorting to one of the embodiments usually adopted.



   Now with regard to said compression chamber., It is made to include a cavity, turning its opening. ture vera the nose of the injector. cavity to, which we give an @ shape and. dimensions such that it envelops, the ', jet of the injector and that its depth, in the direction of the jet, is' at

 <Desc / Clms Page number 3>

 
 EMI3.1
 jl0 '.n6 equal to three laws s measured mean width, pe.rpe'n # jje-'J ... stretch 2. said depth;' an iorme which seems to be particularly lavorable being that of an iuse2u of re'IIolutio'ri De prerence one gives to the aforesaid cavity a p; suirisnte co- roundness so that, at the moment of 1 t inje c td:

  an, t can develop freely in its interior, and that, in practice, all the fuel is burned before having 'time to reach the circle of said cavity. In other words', the cavity -present then a tear such that the jet does not ateiri.t.ni its side walls nor its land. It burns in the ambient air '' without encountering metal walls,
 EMI3.2
 Of course, the injector being carried by lacï.se it is possible to carry the aforesaid cavity either by the cylinder head ", * or by the piston.

   From any lesson, we can see that 1: é "pi ', cito'n;" on going up, lorcerp the air which it compresses to be engouiïir in. said cavity, during the time or injection se'prodtl :: t, t ,, 'e <n;' penetrating through the opening left at the nose of the lrinj # teu U and air then "accompanies" the jet of fuel 1aciH.-c. thus the complete combustion of all its particles,
Preferably, however, ori will cause the above-mentioned cavity to be carried by the engine piston ring.

   
 EMI3.3
 one then advantageously has recourse to a'dipo6i- tion according to which, on the one hand, the cavity a which is terminated by a neck b forming said piston base
 EMI3.4
 ssillie with respect to the piston iond proper a, and, on the other hand, we provide the cylinder head with a housing d at the bottom of '/ which is placed the injector e, said neck and elan housing' !: 'such that the first enters the second when the piston - approaches its top dead center and then the opening of said neck is located opposite the nose of 1 + injector. one has the cavity along the axis of the piston, which results in having, on the one hand, the housing b, and, on the other hand, the injector e along the axis of the cylinder head.
 EMI3.5
 iv ::::

  nt! 3'geu5eLent, we give to the Walls. external.

 <Desc / Clms Page number 4>

 the species of nozzle 1 delimiting the neck b and, from another port, to
 EMI4.1
 internal walls of the housing: of corresponding shapes (for example a t-one shape of a cone at an angle to the sonnet of only a few degrees) such that the interlocking occurs with a very small clearance (de, par ' another example, 2 millimeters for an engine with 100 millimeters of bore). Likewise, it is foreseen that the nozzle f penetrates to the bottom of the housing d,
 EMI4.2
 itself only up to a pull of the pro: shearer of the latter.



  Advantageously again, the protrusion that the bu> e 1 milk with respect to the mowing of the piston is given a 10n1 $ 1.1eU1 'equal to a large iraction of the bore, for example equal to half of the latter. The length of said nozzle may then be, in this particular case, substantially equal to half
 EMI4.3
 of the prol: total order of the room ¯. r: ni: in, preferably, we give to Io peripheral part of the piston ring which surrounds the nozzle Moon convex torme,
 EMI4.4
 for example a frustoconical shape é-viBee, the eorrexponàanie peripheral zone of the cylinder head then being advantageously shaped in a corresponding shape and being in harmony with the edges of the housing d.



   Thanks to the protuberance that is the. mist f, it is understood that, when the piston rises, and this protuberance begins to engage in the housing of the air included between the peripheral part of the piston lond and the peripheral zone of the cylinder head is returned between the walls of the nozzle ± and those of the housing d, which walls go in ae approaching more and more, if their shape is frustoconical, as the piston approaches its top dead paint.



   The air is then violently projected against the bottom
 EMI4.5
 said housing and is found to be engulfed in room a at the same time as the injection occurs. There will also be an interest in giving to. aforesaid mows a form such that

 <Desc / Clms Page number 5>

 the air flow arriving at its periphery is deflected to be returned downwards along the axis of the housing b. An appropriate shape for this element is the slice of a torus mounted on the drawing.



   As already stated, the air thus projected towards the cavity a then “accompanies” the fuel jet, the combustion of which takes place under the best conditions. The mixture still burning. which suddenly emerges from cavity 111 then mixes with the air contained in the peripheral zone of the combustion chamber. The compressed air is thus used to the maximum.



   Of course, the cavity a will preferably be made integral with the piston base c, the latter possibly being independent of the side walls of the piston and fixed to the latter, by any appropriate means.



   Likewise, in order to allow the walls of the housing d, or even the other parts of the cylinder head, to reach a high temperature (a temperature of the order of 200 having been recognized as favorable to good operation), these walls will be deprived of cooling means, for example by isolating them from the circulation of water from the engine, which will cool the walls of the cylinder as well as the part of the cylinder head carrying the injector e in the usual way,
Finally, possibly, we spare? passages g (indicated in dotted lines in the drawing) crossing the walls of the cavity a and opening into the parts of the. compression chamber outside this cavity.

   If, as it seems advantageous to do and as has been shown in the drawing, these passages are situated towards half the depth of the cavity, they will allow the direct passage of the mixture in combustion. to the peripheral parts of the combustion chamber, parts where fresh air is stored ..,
As a result of which we obtain, in all cases., An engine whose i: iodine of operation emerges sufficiently from

 <Desc / Clms Page number 6>

 the above so that it is unnecessary to enter his. subject in no further explanation.

   This engine presents, on those. already. existing systems, in which the proiondeur of the cavity in which the fuel jet is directed is less, among other advantages, that of not subjecting the mixture to a swirling turbulence bringing the particles into contact with walls very hot, this disadvantageous feature bringing the already existing engines closer to those with hot ball or Semi-Diesel.



   As goes without saying, and as moreover already emerges from what precedes, the invention is in no way limited to that of modes. of application no more than to those of the embodiments which have been more especially considered; she kisses some, at. contrary, all variants.


    

Claims (1)

, RESUME. , ABSTRACT. L'invention a pour objet dea perlectionnements appor- tés aux motaeurs à combustion interne, notamment à ceux deux temps, lesquels perfectionnements consistent, principalement, -- et en même temps, qu'à donner à. la chambre de compression des moteurs, du genre en question, une lorme telle qu'elle comporte une. cavité tournant son ouverture vers le nez de l'injecteur à donner à ladite cavité une forme et des. dimensions, telles qu'elle. The invention relates to improvements made to internal combustion engines, in particular to two-stroke engines, which improvements consist, mainly, and at the same time, of giving to. the compression chamber of the engines, of the kind in question, a lorme as it comprises a. cavity rotating its opening towards the nose of the injector to give said cavity a shape and. dimensions, such as. enveloppe le jet de l'injecteur et que sa protondeur dans le sens du jet soit au moins égale à trois fois sa lar- geur moyenne mesurée perpendiculairement ladite protondeur, Elle vise plus particulièrement un certain mode d'application, ainai que certains modes de r éalisation, desdits periectionne- ments; et elle vise plus particulièrement encore, et ce à titre de produits industriels nouveaux-, les moteurs du genre en ques- tion comportant application de ces mêmes perrectionnets, le± éléments apéciaux propres à leur établissement., ainsi que les. ensembles, fixes- ou mobiles, comportant de tels moteurs. envelops the jet of the injector and that its protrusion in the direction of the jet is at least equal to three times its average width measured perpendicularly to said protrusion, It is more particularly aimed at a certain mode of application, as well as certain modes of r realization of said periectionments; and it relates more particularly still, and this as new industrial products, the engines of the kind in question comprising application of these same perrectionnets, the ± elements specific to their establishment., as well as. sets, fixed or mobile, comprising such motors.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2948730A1 (en) * 2009-08-01 2011-02-04 Nee Arranz Cecile Gonzalez Piston for four-stroke type internal combustion engine of four stroke motor-cycle, has prominent dome placed opposite to ignition device, where peripheral groove is formed in piston surface, and groove formed on upper part of piston skirt

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2948730A1 (en) * 2009-08-01 2011-02-04 Nee Arranz Cecile Gonzalez Piston for four-stroke type internal combustion engine of four stroke motor-cycle, has prominent dome placed opposite to ignition device, where peripheral groove is formed in piston surface, and groove formed on upper part of piston skirt

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