Brennstoffeinspritzventil für eine Hubkolbenbrennkraftmaschine für wahlweisen Betrieb mit Dieselöl oder mit einem gasförmigen Brennstoff

摘要

The fuel injection valve (1) has at least two rows of nozzle holes (9, 10) distributed over its circumference, the two rows being separated from one another on the fuel side by a wall (3'). A valve needle (16 and 29), interacting with a valve seat (15 and 28), is assigned to each row of nozzle holes (9, 10), of which needles a first needle (16) is arranged in the centre of the valve body and the second (29) is designed as a hollow needle and is arranged outside the wall (3') in the valve body. The first valve needle (16), intended for the injection of diesel oil, opens in time with the diesel oil pressure generated by an injection pump, lifting off from its valve seat (15), and is brought into the closed position by a spring. The second valve needle (29), intended for the injection of gaseous fuel, is provided with a piston (30), one side of which is acted upon by the pressure of a hydraulic pressure medium controlled by a lift sensor for the synchronised opening of this valve needle, whereas closure of this valve needle occurs due to a pressurised oil block acting on the other side of the piston.