Patent ID: 6439193
Filing Date: 2002-08-27
Classification: F02M

Abstract:
An injection valve arrangement for a combustion engine having a fuel feeding system with a common rail, the injection valve arrangement including:a valve body having a fuel inlet for connection to the common rail of the fuel feeding system and a control inlet for connection to a control pressure, and the valve body also having a fuel outlet, a first needle valve inside the valve body, the first needle valve including a first valve needle, a first piston arrangement cooperating with the first valve needle for controlling operation of the first needle valve, the first piston arrangement comprising a main piston device which bounds a coupling pressure chamber, the main piston device being between the first valve needle and the coupling pressure chamber, so that pressure in the coupling pressure chamber acting on the main piston device resists opening movement of the first valve needle, and wherein the coupling pressure chamber is connected to the control inlet through a constriction channel, a second needle valve inside the valve body, the second needle valve including a second valve needle, a second piston arrangement cooperating with the second valve needle for controlling operation of the second needle valve, and wherein the first and second needle valves are arranged operationally in series with the first needle valve connected to the fuel inlet of the valve body for controlling supply of fuel to the second needle valve and the second needle valve connected to the fuel outlet of the valve body for controlling injection of fuel into a cylinder of the engine, and wherein the first needle valve is arranged to open before the second needle valve during a fuel injection cycle by coordinated action of the first and second piston arrangements.