Abstract: An insulated fuel injection device, particularly for diesel engines, is provided for maintaining the nozzle spray hole temperature at a reduced level during engine operation whereby coking at the nozzle hole is prevented. The device comprises an elongated injection nozzle having a spray hole at one end thereof and an elongated hood covering the nozzle. The hood has a spray orifice therein which is aligned with the nozzle spray hole when the device is assembled. The interior dimensions of the hood and the corresponding exterior dimensions of the nozzle are such that a generally annular gap is presented between the hood and the nozzle, at least in the vicinity of the hole, and a quantity of heat insulating material is disposed in the gap adjacent the nozzle spray hole and the hood aperture.

Abstract: An injection nozzle for injecting two different fuels sequentially into the combustion chamber of an internal combustion engine, for instance ignition fuel and main fuel, is proposed. A relief valve is arranged in the main fuel line, and this relief valve creates a relief space between two injection operations. This relief volume is then filled by the ignition fuel. The relief valve essentially includes a spring-loaded piston which is installed in the main fuel line.

Abstract: A reciprocating piston internal combustion engine having an intake air system, an exhaust gas system, and an injection pump. To lubricate the injection pump, the latter can communicate with the lubricating-oil system of the internal combustion engine; the injection pump conveys a fuel having a low boiling point. A vaporizer is provided, the input side of which can communicate with the lubricating-oil return line of the injection pump, and the output side of which can communicate with the lubricating-oil system of the internal combustion engine and with the intake air system. The vaporizer serves for purifying the lubricating oil of fuel constituents which have a low boiling point and which contaminated the lubricating oil as a result of unavoidable leakages within the injection pump.

Abstract: An insulated fuel injection device, particularly for diesel engines, is provided for maintaining the nozzle spray hole temperature at a reduced level during engine operation whereby coking at the nozzle hole is prevented. The device comprises an elongated injection nozzle having a spray hole at one end thereof and an elongated hood covering the nozzle. The hood has a spray orifice therein which is aligned with the nozzle spray hole when the device is assembled. The interior dimensions of the hood and the corresponding exterior dimensions of the nozzle are such that a generally annular gap is presented between the hood and the nozzle, at least in the vicinity of the hole, and a quantity of heat insulating material is disposed in the gap adjacent the nozzle spray hole and the hood aperature.

Abstract: A piston, especially for internal combustion engines, which piston has a cup-shaped combustion chamber depression in the upper face wall, with recesses in the upper edge of the depression for a fuel injection nozzle and an ignition device, respectively. The fuel is injected into the cavity with a short unrestrained length of spray onto the depression wall, and during fuel injection combustion air is moved about an axis extending in the longitudinal direction of the piston. The combustion chamber depression has an at least nearly cylindrical wall in the region of the recesses, the first recess is formed by a trough which has sharp edges, terminates flat, and is inclined to a surface line of the depression. The other recess with which is associated the ignition device extends closely adjacent to the first recess, at an angle in the direction opposite to movement of air, with a ridge being provided between the two recesses.