Other engines characterised by special shape or construction of combustion chambers to improve operation

FMECHANICAL ENGINEERING LIGHTING HEATING WEAPONS BLASTING ENGINES OR PUMPS F02Combustion engines F02BINTERNAL-COMBUSTION PISTON ENGINES COMBUSTION ENGINES IN GENERAL

F02B23/00Other engines characterised by special shape or construction of combustion chambers to improve operation

F02B23/02with compression ignition F02B23/04the combustion space being subdivided into two or more chambers F02B23/06the combustion space being arranged in working piston F02B23/0603at least part of the interior volume or the wall of the combustion space being made of material different from the surrounding piston part F02B23/0618having in-cylinder means to influence the charge motion F02B23/0621Squish flow F02B23/0624Swirl flow F02B23/0627having additional bores or grooves machined into the piston for guiding air or charge flow to the piston bowl F02B23/063the combustion space in the piston interacting fluid dynamically with the cylinder head, the injector body or the cylinder wall F02B23/0633the combustion space being almost completely enclosed in the piston F02B23/0636the combustion space having a substantially flat and horizontal bottom F02B23/0639the combustion space having substantially the shape of a cylinder F02B23/0642the depth of the combustion space being much smaller than the diameter of the piston F02B23/0645Details related to the fuel injector or the fuel spray F02B23/0648Means or methods to improve the spray dispersion, evaporation or ignition F02B23/0651the fuel spray impinging on reflecting surfaces or being specially guided throughout the combustion space F02B23/0654Thermal treatments F02B23/0657the spray interacting with one or more glow plugs F02B23/066the injector being located substantially off-set from the cylinder centre axis F02B23/0663having multiple injectors per combustion chamber F02B23/0666having a single fuel spray jet per injector nozzle F02B23/0669having multiple fuel spray jets per injector nozzle F02B23/0672Omega-piston bowl F02B23/0675the combustion space being sunstantially spherical, hemispherical, ellipsoid or parabolic F02B23/0678Unconventional, complex or non-rotationally symmetrical shapes of the combustion space F02B23/0681Square, rectangular or the like profiles F02B23/0684Ring like bowl F02B23/0687Multiple bowls in the piston F02B23/069characterised by its eccentricity from the cylinder axis F02B23/0693the combustion space consisting of step-wise widened multiple zones of different depth F02B23/0696W-piston bowl F02B23/08with positive ignition F02B23/10with separate admission of air and fuel into cylinder F02B23/101the injector being placed on or close to the cylinder centre axis F02B23/104the injector being placed on a side position of the cylinder F02B23/105the fuel is sprayed directly onto or close to the spark plug