Abstract: In internal combustion engines having direct injection, an injector injects fuel into the combustion chamber to form an ignitable fuel/air mixture with combustion air supplied separately, the mixture being ignitable by a spark plug. The fuel is injected in a conical pattern, and the electrodes are protected from wetting by fuel and from coking if they are located outside the lateral surface of the fuel cone produced by the injection nozzle. To introduce an ignitable mixture between the electrodes and to ensure optimum operating performance of the internal combustion engine by improving the combustion process, a combustion chamber is configured so that the fuel cone is injected in a free jet which is substantially completely unaffected by the combustion chamber perimeter, and the electrodes of the spark plug project into a fuel vortex emerging from the lateral surface during injection.

Abstract: A closure for a fuel tank filler neck has a closure cap which is swivel-mounted on the upper side of the said closure and can be opened from the closed position by the effect of force on a lever arm arranged on the far side of the swivel axis. A pawl for locking and unlocking of the closure cap is swivellable and prestressed in the closing sense or direction by spring force and has an outwardly extending lever arm for mechanically lifting the pawl against the spring force. To ensure a permanent and reliable closing function of the closure cap, the filler neck bears an axially accessible adjusting ring which is arranged coaxially with respect to the cap. The ring is mounted rotatably on the outer circumference of the latter and/or on the axial end face of a shoulder thereof, and has on its upper side, at least in a subregion, a spiral toothing. A toothed segment is arranged on the lever arm of the closure cap.