Fuel injection system for internal combustion engines
AssigneeRobert Bosch GmbH
InventorHans-Christoph Magel
Life of this patent
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Abstract
A fuel injection system for internal combustion engines, having a fuel injection nozzle supplied with fuel by a high-pressure fuel source, which fuel injection nozzle has a movable nozzle piston for opening and closing injection openings, an injection nozzle high-pressure chamber, and an injection nozzle control chamber. A pressure boosting device connected between the fuel injection nozzle and the high-pressure fuel source has a movable piston, a work chamber, and a high-pressure chamber, in which a filling connection which is open for filling the high-pressure chamber when the fuel injection nozzle is closed and is itself closed when the fuel injection nozzle is open.
Claims11
A fuel injection system for internal combustion engines, comprising
- a fuel injection nozzle (2), which can be supplied with fuel by a high-pressure fuel source (1), the fuel injection nozzle (2) having a movable nozzle piston (3) for opening and closing injection openings (6), an injection nozzle high-pressure chamber (21), an injection nozzle control chamber (20), and a closing spring located within the control chamber (20) for biasing the nozzle piston (3) in a direction to close the injection openings (6),
- a pressure boosting device (7) is connected between the fuel injection nozzle (2) and the high-pressure fuel source (1), the pressure boosting device (7) having a movable pressure booster piston (8), a pressure booster work chamber (11), and a pressure booster high-pressure chamber (9), and
- a filling connection (10) which is open for filling the pressure booster high-pressure chamber (9) when the fuel injection nozzle (2) is closed and is itself closed by the nozzle piston (3) when the fuel injection nozzle (2) is open, said filling connection (10) including a throttle (23),
- wherein closure of the filling connection (10) is coupled with the motion of the nozzle piston (3) in the opening direction to uncover the injection openings, and
- wherein the control chamber (20) is hydraulically connected to the pressure booster high-pressure chamber (9) by the filling connection (10).
Dependencies are inferred from the claim text.