Filter arrangement for fuel injection systems
AssigneeRobert Bosch GmbH
InventorsHans-Christoph Magel, Martin Kropp
Life of this patent
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Abstract
A fuel injection system for internal combustion engines, having a fuel injector that can be acted upon by a high-pressure fuel source includes a pressure booster, which contains a movable boosting element dividing a work chamber which can be made to communicate with the high-pressure source via a high-pressure line from a high-pressure chamber that acts on the fuel injector. The high-pressure from chamber is variable by filling and evacuating a differential pressure chamber of the pressure booster. A filter element is received in a line portion that branches off from the high-pressure line and is upstream of flow connections for filling the differential and high pressure chambers.
Claims11
A fuel injection system for internal combustion engines, comprising
- a fuel injector (26) that can be acted upon by a high-pressure fuel source (2, 43),
- a pressure booster (13) including a work chamber (15), a high pressure chamber (17), a differential pressure chamber (16), and a movable pressure boosting element (14), the pressure booster being disposed between the fuel injector (26) and the high-pressure source (2, 43), the pressure boosting element (14) dividing the work chamber (15), which can be made to communicate with the high-pressure source (2, 43) via a high-pressure line (3), from the high-pressure chamber (17) that acts upon the fuel injector (26),
- means filling the differential pressure chamber (16) of the pressure booster (13) with fuel and evacuating the differential pressure chamber (16) of fuel during restoration and pressure boosting phases, respectively, to thereby vary the pressure in the high pressure chamber (17)
- a filter element (5) connected in a line portion (4) branching from high pressure line (3) upstream of at least one of the chambers (15, 16, 17) of the pressure booster and upstream of the flow conduits (10, 20, 23;
- 42, 44) for filling at least one of the pressure chambers (16, 17) of the pressure booster (13), wherein the line portion (4) containing the filter element (5) changes over into flow conduits (10, 20, 23) for filling the differential pressure chamber (16) and the high-pressure chamber (17) of the pressure booster (13).
Dependencies are inferred from the claim text.