Untitled record

The invention relates to a fuel valve according to the type of the patent 480 948. This patent has a fuel valve to the object, in which the fuel stored before the beginning of the injection process in the valve housing, while expelling the injection air and when the valve through the blowing air from the storage space pressed against it onto a shut-off point. His Erfindungsm, erkinale consist essentially in the fact that the combination of fuel and Einblaseluft A.bschälstelle only during the Einblasev operation is possible that fuel and Einblaseluft but immediately at the beginning of Einblasevorganges (ie when lifting the valve) meet.

The treated in the main patent embodiment is structurally designed so that it must assume a vertical position in the machine.

The present invention relates to a further embodiment which also makes such a fuel valve suitable for horizontal or oblique position in the machine. It consists in the fact that the displacement of the fuel takes place in a space located above the needle, the lower part of which communicates with the annular channel from which the bores lead to the needle seat and whose upper part is connected to the air space.

In the drawing, an embodiment of the invention is illustrated in a vertical section.

In the valve body A there is an air space a1, into which a supply line a3 for the injection air opens, while the supply of the fuel through the supply line a2 takes place. The seat for the valve needle B and the conclusion of the air space d forms a valve insert C, which is held together with an upstream nozzle plate D by a screwed onto the valve body A union nut E. The leadership of the fuel needle B is formed by an extension c 'of the insert C, which has holes c' for the passage of air to the needle seat.

The air space a1 is in open needle with the cylinder space, not shown, through the bore cli in the valve core, the hole dl the nozzle plate D and the bore ei of the union nut E in combination. The fuel supply line a2 leads to an annular groove c "located in the valve insert C, from which radial bores c4 pass through the valve insert C to the valve seat of the fuel needle. In addition, the annular space c6 is connected by a channel a4 with a cavity a ', which serves as a fuel storage point.

The cavity a5 and the air space a 'communicate with each other through a tube G projecting into the cavity a15. The screw H is used to seal the required for the attachment of the tube G opening.

The mode of action of the valve is the following: The fuel pump promotes the fuel before the injection process by .The supply line a2 on the one hand in the annular groove cl; and the holes c4 and on the other hand through the channel a4 in serving as a plenum chamber a15, in which the fuel occupies a certain height depending on the flow, but must not exceed the top of the pipe section G. The air in turn passes through the supply line a5 in the air space a1 and through the tube G in the plenum a5 above the fuel therein. Now, if the fuel needle lifted from its seat, the air flows through the holes c8 of the guide body c7 and then at great speed and with a strong pressure drop past the needle tip. This creates an overpressure of the air in the plenum a6 located opposite the discharge point of the fuel, with the result that the fuel located in the cavity a5 through the annular groove cl; and the holes c4 is pressed into the exiting air stream which entrains the fuel and atomizes into the cylinder.

By the described embodiment, a reliable fuel injection valve has been created for lying or oblique arrangement of the fuel valve, which meets all requirements in terms of the main patent.