Device for injecting fuel into the combustion chamber of an internal combustion engine

A device for intermittently injecting high-pressure fuel into a combustion chamber of an internal combustion engine, having a fuel injection valve, which has a housing that has a high-pressure inlet, a recess and a high-pressure space having a valve carrier which has a fuel passage having a check valve which allows flow of the fuel from the high-pressure inlet through the fuel passage into the high-pressure space with as little hindrance as possible and at least restricts said flow in the opposite direction, having a feed line for feeding fuel to the fuel injection valve, and having a fastening element which loads the feed line in a direction toward the high-pressure inlet, wherein the high-pressure inlet has an annular sealing surface which is situated in a sealing plane, the valve carrier has, in a step-type narrowing, an annular outer sealing surface, which is situated in the sealing plane and rests sealingly on the annular sealing surface of the high-pressure inlet, and (i) the fastening element presses the feed line against the valve carrier and presses the latter against the high-pressure inlet, or (ii) the fastening element presses the feed line against an intermediate connection piece having a through feed bore for the fuel, and said connection piece presses the valve carrier against the high-pressure inlet.

A device for intermittently injecting high-pressure fuel into a combustion chamber of an internal combustion engine, having a fuel injection valve which has a housing that has a high-pressure inlet, a recess and a high-pressure space, having a valve carrier which has a fuel passage, having a check valve, which allows flow of the fuel from the high-pressure inlet through the fuel passage into the high-pressure space with as little hindrance as possible and at least restricts said flow in the opposite direction, having a feed line for feeding fuel to the fuel injection valve, and having a fastening element which loads the feed line in a direction toward the high-pressure inlet, wherein the high-pressure inlet has a conical sealing surface, the valve carrier has a conical outer sealing surface on an outer circumferential surface, which sealing surface rests sealingly on the conical sealing surface of the high-pressure inlet, the fastening element presses the feed line against an intermediate connection piece fastened on the housing and having a through feed bore for the fuel, and said connection piece presses the valve carrier against the high-pressure inlet.

A device for intermittently injecting high-pressure fuel into a combustion chamber of an internal combustion engine, having a fuel injection valve, which has a housing that has a high-pressure inlet, a recess and a high-pressure space, having a valve carrier which has a fuel passage, having a check valve which allows flow of fuel from the high-pressure inlet through the fuel passage into the high-pressure space with as little hindrance as possible and at least restricts said flow in the opposite direction, having a feed line for feeding fuel to the fuel injection valve, and having a fastening element which loads the feed line in a direction toward the high-pressure inlet, wherein the high-pressure inlet has a conical sealing surface, the valve carrier having on an outer circumferential surface, a conical outer sealing surface and a thread, the valve carrier being screwed by its thread into a mating thread of the housing, with the result that the conical outer sealing surface rests sealingly on the conical sealing surface of the high-pressure inlet, and the fastening element presses the feed line against the valve carrier.