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AssigneeRobert Bosch GmbH
InventorsPeter Brendle, Rainer Schneider, Achim Eisemann, Maximilian Kronberger, Herbert Strahberger, Ernst Feichtinger
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A fuel injection device for internal combustion engines, having a fuel injection pump, which can be inserted into a housing of the engine and is axially clamped together with a fuel injection valve by means of a clamping sleeve. The valve, with an end remote from the pump, protrudes into a combustion chamber of the engine. A fuel supply line to the fuel injection pump feeds into an annular chamber encompassing the clamping sleeve and, via through openings in the clamping sleeve and inlet conduits in the pump housing, the valve can be connected to a pump working chamber of fuel injection pump. According to the invention, the fuel filter in the inlet to the pump working chamber is constituted by the clamping sleeve, which has a multitude of filter openings for this purpose in its circumference wall, in the vicinity of the annular chamber.
A fuel injection device for internal combustion engines, comprising a fuel injection pump (5), which is inserted into a housing of the engine, said fuel injection pump is axially clamped together with a fuel injection valve (7) by means of a clamping sleeve (9), said fuel injection valve with an end remote from the pump, protrudes into a combustion chamber of the engine, a fuel supply line (41) to the fuel injection pump (5) feeds fuel into an outer annular chamber (37) encompassing the clamping sleeve (9) and, via through openings (39) in the clamping sleeve (9) and inlet conduits (49) in the pump housing, the clamping sleeve is connected to a pump working chamber (19) of the fuel injection pump (5), a fuel filter is provided in the fuel inlet of the fuel injection pump (5), said fuel filter is constituted by the clamping sleeve (9) and has a multitude of filter openings (39) in a circumference wall in a vicinity of the annular chamber (37).
A process for producing filter openings (39) in filter bodies of fuel injection devices, by means of an electron or laser beam, depositing an elastic material on a wall side of the filter body remote from the beam, said elastic material evaporates when struck by the beam during the processing phase, and thereby rinses the material that is cut out of the processed filter opening (39).
Dependencies are inferred from the claim text.