CH236099A

CH236099A - Two-stroke internal combustion engine.

Info

Publication number: CH236099A
Authority: CH
Inventors: Kadenacy Michel
Original assignee: Kadenacy Michel
Priority date: 1934-11-03
Filing date: 1935-10-21
Publication date: 1945-01-15

Description

  

  Moteur à combustion interne à deux temps.    La présente invention se rapporte à un  moteur à combustion interne à deux temps  dans lequel le     réglage    de la distribution et  la disposition sont tels que, lors de l'échap  pement, les gaz brûlés quittent le cylindre à  une grande vitesse en laissant dans celui-ci  et dans la partie adjacente du conduit d'échap  pement une     dépression        qu'un        retour        des    gaz  brûlés vers le cylindre tend à combler. Cette  dépression est utilisée pour introduire la  charge fraîche dans le cylindre.

   A cet effet,  le moteur selon l'invention est caractérisé en  ce que cette dépression est utilisée pour l'in  troduction de la charge fraîche dans le cylin  dre en introduisant la totalité des gaz frais  constituant cette charge dans la partie du  conduit d'échappement adjacente au cylindre  pendant que la dépression règne dans cette  partie du conduit, afin que cette charge soit  ensuite chassée dans le cylindre par l'orifice  d'échappement par les gaz brûlés revenant  alors vers le cylindre.  



  Un orifice d'admission distinct ou séparé  sur le cylindre n'est doue pas nécessaire. La    disposition du moteur pourrait être telle que  les gaz frais soient introduits dans le conduit  d'échappement par la pression atmosphé  rique.  



  Dans ce cas, le conduit d'échappement  pourrait présenter un ou plusieurs orifices       situés        près    du cylindre et commandé par des  soupapes automatiques s'ouvrant vers l'inté  rieur du conduit de façon à admettre de l'air  ou d'autres gaz frais à la pression atmosphé  rique dans le conduit d'échappement lors  qu'une dépression existe à l'intérieur de ce  conduit à la suite de la sortie des gaz brûlés  du cylindre, et à se     fermer    lorsque la     dépres-          sion        est    détruite.

   De     talles    soupapes peuvent,  par     exemple,    être     formées    par de très     légères          lames    formant     ressort    et     commandant    des       orifices    ouverts     sur        l'atmosphère.        'Dans    cette       forme        @d'exécutnon    du moteur,     lorsque        les    gaz  brûlés commencent à revenir vers le cylindre,  la pression dans le .conduit     montera,

      ces sou  papes se     refermeront        automatiquement    -et l'air  ou les     autree    gaz     enfermés        -dans    le conduit  d'échappement seront     chassés    dans le cylindre      à travers l'orifice d'échappement par les gaz  brûlés revenant vers le cylindre.  



  Dans une autre forme d'exécution du mo  teur, le, conduit d'échappement pourrait être  pourvu d'un orifice communiquant par l'in  termédiaire d'un organe de distribution com  mandé avec une source de gaz frais sous pres  sion. Cet orifice pourrait communiquer avec  une tuyère d'injection située à l'intérieur du  conduit et disposée pour fournir les gaz fraie  dans la direction d'échappement. Dans ce cas,  l'organe distributeur serait commandé de  façon que l'introduction de la charge compri  mée de gaz frais dans le conduit d'échappe  ment ne se termine pas plus tard que la fer  meture de la lumière d'échappement du cylin  dre.

   Pour obtenir une dépression suffisante  dans le cylindre et le conduit, il faut que  l'aire de     l'orifice    d'échappement disponible  pour la décharge des gaz brûlés soit aussi  grande que possible et que le laps de temps  qui s'écoule jusqu'à ce que l'aire requisse pour  cette décharge des gaz brûlés soit disponible,  soit aussi court que possible.



  Two-stroke internal combustion engine. The present invention relates to a two-stroke internal combustion engine in which the timing and arrangement are such that, on exhaust, the burnt gases leave the cylinder at a high speed leaving in it. here and in the adjacent part of the exhaust duct a depression that a return of the burnt gases to the cylinder tends to fill. This vacuum is used to introduce the fresh charge into the cylinder.

   To this end, the engine according to the invention is characterized in that this depression is used for the introduction of the fresh charge into the cylinder dre by introducing all of the fresh gases constituting this charge into the part of the exhaust duct. adjacent to the cylinder while the vacuum prevails in this part of the duct, so that this charge is then driven into the cylinder through the exhaust port by the burnt gases then returning to the cylinder.



  A separate or separate inlet port on the cylinder is not required. The arrangement of the engine could be such that the fresh gases are introduced into the exhaust duct by atmospheric pressure.



  In this case, the exhaust duct could have one or more orifices located near the cylinder and controlled by automatic valves opening towards the interior of the duct so as to admit air or other fresh gases to the cylinder. the atmospheric pressure in the exhaust duct when a vacuum exists inside this duct following the release of the burnt gases from the cylinder, and to close when the vacuum is destroyed.

   Valve tales can, for example, be formed by very light leaves forming a spring and controlling orifices open to the atmosphere. 'In this form of engine execution, when the burnt gases start to flow back to the cylinder, the pressure in the pipe will rise,

      these valves will close automatically - and the air or other gases trapped - in the exhaust duct will be driven into the cylinder through the exhaust port by the burnt gases returning to the cylinder.



  In another embodiment of the engine, the exhaust duct could be provided with an orifice communicating via a controlled distribution member with a source of fresh gas under pressure. This orifice could communicate with an injection nozzle located inside the duct and arranged to supply the spawning gases in the exhaust direction. In this case, the distributor member would be controlled so that the introduction of the compressed charge of fresh gas into the exhaust duct does not end later than the closing of the exhaust port of the cylinder. .

   To obtain sufficient negative pressure in the cylinder and the duct, it is necessary that the area of the exhaust port available for the discharge of the flue gases is as large as possible and that the period of time elapsing up to what the area requires for this flue gas discharge is available or as short as possible.

Claims

CLAIM Two-stroke internal combustion engine, in which the adjustment of the distribution and the arrangement are such that, during the exhaustion, the burnt gases leave the cylinder at high speed leaving in it and in the adjacent part from the exhaust duct a depression which a return of the burnt gases to the cylinder then tends to fill, characterized in that this depression is used for the introduction of the fresh charge into the cylinder by introducing all the fresh gases constituting this charge in the part of the exhaust duct adjacent to the cylinder while the vacuum prevails in this part of the duct,

so that this charge is then driven into the cylinder through the exhaust port by the burnt gases, then returning to the cylinder. SUB-CLAIMS: 1. Engine according to claim, characterized by an arrangement such that the fresh gases are introduced into the exhaust duct at atmospheric pressure. 2. Engine according to claim, characterized by such an arrangement due to the fresh gases being introduced into the exhaust duct at a pressure greater than the atmospheric pressure.

Engine according to claim and sub-claim 1, characterized in that the exhaust duct communicates with the atmosphere by means of at least one orifice controlled by an automatic valve in one direction, opening towards the air. 'inside the exhaust duct, so that fresh air is admitted into this duct by atmospheric pressure when a de-pressure exists inside this duct and that this valve closes when this depression ceases. to exist. 4. Engine according to claim and sub-claim 2. characterized in that the exhaust duct has a communicating orifice. by means of a controlled distribution member, with a source of fresh compressed gas.

Engine according to claim and sub-claims 2 and 4, characterized in that this distribution member is controlled in such a way that the introduction of the compressed charge of fresh gas into the exhaust duct does not end either. late due to the closing of the engine exhaust light. 6. Engine according to claim and sub-claims 2 and 4, characterized in that the source of fresh compressed gas communicates, through the orifice presented by the exhaust duct, with a tubular element located at the interior of the exhaust duct and arranged to supply these fresh gases into the. clireel, ion. exhaust.

î. -Motor according to. Claim and sub-revendica.tions -2, 1 and 6, characterized by the fact; c; uP the tubular element has the form of an injection nozzle.