Fuel-injection valve for internal combustion engines
OwnerRoger Potschin, Wolfgang Albrechtinventors
Life of this patent
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OwnerRoger Potschin, Wolfgang Albrechtinventors
Estimating the term…
A fuel injection valve with a valve member (10), which cooperates with a valve seat (16) to control injection openings (20). The valve member (10) is guided, in a portion remote from the combustion chamber, in a bore (7) and is surrounded by a pressure chamber (12), which can be filled with fuel at high pressure. The valve member (10) is urged by a spring (27) disposed in a spring chamber (25) and having a closing force in the direction of the valve seat (16), and in an appropriate opening pressure in the pressure chamber (12), as a result of the hydraulic pressure on a pressure shoulder (11), embodied on the valve member (10), the valve member lifts from the valve seat (10) and thus opens the injection openings; the injection of the fuel is effected separately in a main injection and a subsequent postinjection. The pressure chamber (12) and the spring chamber (25) communicate via a throttle connection, so that the pressure in the otherwise closed-off spring chamber (25) rises during the main injection and via the additional hydraulic force on the valve member (10) raises the opening pressure of the postinjection; the pressure in the spring chamber (25) has reached the initial value again by the onset of the next injection cycle (FIG. 1).
A fuel injection valve for internal combustion engines, having a valve body (1) in which a valve member (10) is disposed longitudinally displaceably in a bore (7), which valve member, on its end toward the combustion chamber, has a valve sealing face (18) that cooperates with a valve seat (16), embodied in the valve body (1), for controlling at least one injection opening (20), and remote from the combustion chamber, the valve member (10) protrudes at least indirectly into a spring chamber (25), where it is urged toward the valve seat (16) by a spring (27) disposed in the spring chamber (25), and having a pressure chamber (12) which can be filled with fuel and surrounds the valve member (10) and in which a pressure face (11) embodied on the valve member (10) is disposed, so that by delivering fuel to the pressure chamber (12), the fuel pressure there increases, beginning at a static pressure (p0), and exerts a hydraulic force, oriented counter to the closing force of the spring (27), on the pressure face (11), as a result of which the valve member (10), at an opening pressure (p1;
Dependencies are inferred from the claim text.