Fuel injection valve for internal combustion engines

it a fuel injection valve for internal combustion engines, having an axially movable valve member (21) which, with its end oriented toward the combustion chamber, opens and closes a through flow cross section to at least one injection opening (27) and which, with its end remote from the combustion chamber, at least indirectly protrudes into a fuel-filled spring chamber (37) in which a valve spring (41) is clamped, which acts on the valve member (21) in the closing direction and is supported with its end remote from the valve member against a deflecting piston (45), which piston, during the supply of high pressure fuel to the fuel injection valve, can be moved by a certain stroke path into the spring chamber (37) and thereby increases the initial stress force of the valve spring (41), and having a connecting conduit between the spring chamber (37) and a low pressure fuel chamber (73), the improvement wherein the connecting conduit between the low pressure fuel chamber (73) and the spring chamber (37) is embodied as a throttle (99), wherein on its end remote from the combustion chamber, the valve member (21) has a pressure pin (35) which protrudes into a fuel-filled damping chamber (47), which is defined by a stationary shoulder (49) that constitutes a stroke stop for an annular shoulder (51) on the valve member (21), and wherein between the wall of the damping chamber (47) and the pressure pin (35) a throttle cross section is formed, which feeds into the spring chamber (37) and can be closed during the stroke motion of the valve member (21).

In a fuel injection valve for internal combustion engines, having an axially movable valve member (21) which, with its end oriented toward the combustion chamber, opens and closes a through flow cross section to at least one injection opening (27) and which, with its end remote from the combustion chamber, at least indirectly protrudes into a fuel-filled spring chamber (37) in which a valve spring (41) is clamped, which acts on the valve member (21) in the closing direction and is supported with its end remote from the valve member against a deflecting piston (45), which piston, during the supply of high pressure fuel to the fuel injection valve, can be moved by a certain stroke path into the spring chamber (37) and thereby increases the initial stress force of the valve spring (41), and having a connecting conduit between the spring chamber (37) and a low pressure fuel chamber (73), the improvement wherein the connecting conduit between the low pressure fuel chamber (73) and the spring chamber (37) is embodied as a throttle (99), wherein the deflecting piston (45) is guided in a hydraulic work chamber (81), which has two different diameters, wherein a first smaller diameter region (85) continuously communicates with a pump work chamber (63) of the high pressure pump (3) and a second larger diameter region (87) can be connected to the pump work chamber (63) only after the opening of a through flow cross section through a stroke motion of tho deflecting piston (45) and that the deflecting piston (45) has two different hydraulic force introduction surfaces of which a first smaller force introduction surface (89) adjoins the first smaller diameter region (85) of the hydraulic work chamber (81) and a second larger force introduction surface (91) is disposed in the second larger diameter region (87) of the hydraulic work chamber (81).

In a fuel injection valve for internal combustion engines, hasting an axially movable valve member (21) which, with its end oriented toward the combustion chamber, opens and closes a through flow cross section to at least one injection opening (27 and which, with its end remote from the combustion chamber, at Least indirectly protrudes into a fuel-filled spring chamber (37) in which a valve spring (41) is clamped, which acts on the valve member (21) in the closing direction arid is supported with its end remote from the valve member against a deflecting piston (45), which piston, during the supply of high pressure fuel to the fuel injection valve, can be moved by a certain stroke path into the spring chamber (37) and thereby increases the initial stress force of the valve spring (41), and having a connecting conduit between the spring chamber (37) and a low pressure fuel chamber (13), the improvement wherein the connecting conduit between the low pressure fuel chamber (73) and the spring chamber (37) is embodied as a throttle (99), wherein a high pressure pump (3) that delivers high pressure fuel constitutes a component together with the fuel injection valve (1) and this component is adapted to be inserted into a housing (7) of the engine to be supplied, and wherein an electric control valve (5) is disposed on the high pressure pump (3) in order to control the high pressure delivery of the high pressure pump (3), and wherein the deflecting piston (45) is guided in a hydraulic work chamber (81), which has two different diameters, wherein a first smaller diameter region (85) continuously communicates with a pump work chamber (63) of the high pressure pump (3) and a second larger diameter region (87) can be connected to the pump work chamber (63) only after the opening of a through flow cross section through a stroke motion of the deflecting piston (45) and that the deflecting piston (45) has two different hydraulic force introduction surfaces of which a first smaller force introduction surface (89) adjoins the first smaller diameter region (85) of the hydraulic work chamber (81) and a second larger force introduction surface (91) is disposed in the second larger diameter region (87) of the hydraulic work chamber (81).