Fuel injection valves for internal combustion engines
AssigneeRobert Bosch GmbH
InventorsFriedrich Moser, Thomas Kuegler
Life of this patent
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AssigneeRobert Bosch GmbH
InventorsFriedrich Moser, Thomas Kuegler
Estimating the term…
A fuel injection valve with a valve body has a bore that contains a piston-shaped valve member. The valve member is guided in the bore with a sealing section and a guiding section; between the sealing section and the guiding section, the valve member is encompassed by a first pressure chamber and between the guiding section and the combustion chamber end, is encompassed by a second pressure chamber. In the guiding section of the valve member, an annular collar is provided and has a side oriented toward the combustion chamber and a side oriented away from the combustion chamber. The annular collar has a throttle connection embodied on it, which connects the sides of the annular collar to each other and thus produces a throttled connection from the first pressure chamber to the second pressure chamber.
In a fuel injection valve for internal combustion engines, having a valve body (1) with a bore (3) that contains a piston-shaped valve member (5) in a longitudinally movable fashion, which valve member (5) controls at least one injection opening (17) disposed at the end of the bore (3) oriented toward the combustion chamber and is guided in the bore (3) with a sealing section (105) remote from the combustion chamber and having an annular collar (22), which is disposed on the valve member (5) closer to the combustion chamber than the sealing section (105) and which has a side (37) oriented toward the combustion chamber and a side (36) oriented away from the combustion chamber and which annular collar (22) divides the space between the valve member (5) and the bore (3) into a first pressure chamber (9), which is oriented away from the combustion chamber and can be filled with fuel, and a second pressure chamber (19) which is oriented toward the combustion chamber, and having a bore guiding section (203) of the bore (3) into which the annular collar (22) plunges in the closed position of the valve member (5) and thus separates the two pressure chambers (9, 19) with the exception of a throttle cross section and out of which the annular collar (22) emerges during opening stroke motion of the valve member (5) and thus connects the pressure chambers (9, 19) to each other, the improvement wherein the throttle cross section is at least one throttle conduit (40, 42) having an inlet formed in the side (36) of the annular collar (22) oriented away from the combustion chamber and an outlet formed in the side (37) of the annular collar (22) oriented toward the combustion chamber and which connects the two sides (36, 37) of the annular collar (22) to each other.
Dependencies are inferred from the claim text.