Patent ID: 7143738

Claim:
A direct-injection spark-ignition internal combustion engine having cylinders ( 2 ) with combustion chambers ( 4 ) and pistons ( 3 ) disposed in the cylinders ( 2 ) and one injector ( 8 ) per cylinder ( 2 ) for injecting fuel into the combustion chamber ( 4 ) which is bounded by the piston ( 3 ) movably disposed in the respective cylinder, the injector ( 8 ) having an injection nozzle ( 11 ) with a plurality of injection holes ( 12 ) distributed over its circumference for the generation of jets of fuels ( 13 ), the injection holes ( 12 ) forming during an injection process, with combustion air fed separately into the cylinder ( 2 ), a conical cloud ( 14 ) of fuel, said piston ( 3 ) having a piston head ( 5 ) and a recess ( 6 ) formed in the piston head ( 5 ), approximately opposite the injection nozzle ( 11 ), the piston recess ( 6 ) having a plurality of radial cavities ( 16 ) formed in the piston head ( 5 ) for receiving injected fuel, the radial cavities ( 16 ) being distributed over the circumference of the piston recess ( 6 ) in such a way that each injection hole ( 12 ) of the injector ( 8 ) is assigned a cavity ( 16 ) for receiving the respective jet of fuel ( 13 ).