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AssigneeRobert Bosch GmbH
InventorsJuergen Buchholz, Martin Maier, Jiri Marek, Hans-Peter Trah
Estimating the term…
A fuel injection valve including a perforated silicon plate disposed downstream of a valve seat and having an atomization opening that widens in the flow direction. The perforated silicon plate has at least one elongated recess on an upper end face oriented toward the valve seat face; this recess at least partly overlaps a metering opening extending as far as a lower face end of the perforated plate. The perforated plate makes it possible to form flat streams, so that very fine atomization of the injected fuel is attained. Forming the elongated recesses and atomization openings by etching makes high-precision manufacture possible at low production cost. The perforated plate and fuel injection valve are especially suitable for injection systems of mixture-compressing internal combustion engines with externally supplied ignition.
A perforated plate of monocrystalline silicon including an upper face surface (35) and a lower face surface (31) with at least one elongated atomization opening, the perforated plate (23) has at least one elongated recess (39) formed in said upper face surface by etching, said at least one elongated recess forms an elongated cross section in a plane parallel with said upper surface of said perforated plate, said at least one elongated atomization opening (41) is formed in said lower face surface concentrically with said elongated recess (39) by etching with said at least one elongated recess overlapping said at least one elongated atomization opening (41), said at least one atomization opening extending from said lower face surface (31) of the perforated plate (23) toward said at least one elongated recess with the at least one elongated atomization opening perpendicular with said at least one elongated recess.
A perforated plate of monocrystalline silicon having at least one atomization opening, the perforated plate (23) from an upper face surface (35) of said perforated plate has at least one elongated recess (39) formed by etching, said at least one elongated recess partly overlaps a respective at least one atomization opening (41) formed out by etching and extending as far as a lower face surface (31) of the perforated plate (23), said at least one elongated recess (39) has two opposed long sides (45) extending in a direction of the atomization opening (41), said long sides include long edges (49) formed along the upper face surface (35) of the perforated plate (23), said long edges extend parallel to one another and parallel to a longitudinal axis (53) of the recess (39);
A fuel injection valve for fuel injection systems of internal combustion engines, having a perforated plate that is disposed downstream of a valve seat face of a nozzle body of the fuel injection valve, said perforated plate has at least one quadrilateral atomization opening and is embodied of monocrystalline silicon, said perforated plate (23) has at least one elongated recess (39) formed by etching from an upper face surface (35) oriented toward the valve seat face (13), said at least one elongated recess partly overlaps a respective at least one quadrilateral atomization opening (41) formed out by etching and extending as far as a lower face surface (31) of the perforated plate (23), and said at least one recess forms an elongated cross section in a plane parallel to the upper face surface.
A fuel injection valve for fuel injection systems of internal combustion engines, having a perforated plate that is disposed downstream of a valve seat face of a nozzle body of the fuel injection valve, said perforated plate has at least one atomization opening and is embodied of monocrystalline silicon, said perforated plate (23) has at least one elongated recess (39) formed by etching on one upper face surface (35) oriented toward the valve seat face (13), said at least one elongated recess partly overlaps at least one respective atomization opening (41) formed by etching and extending as far as a lower face surface (31) of the perforated plate (23), said at least one elongated recess (39) has two opposed long sides (45) extending in a direction of the at least one atomization opening (41), said long sides include long edges (49) formed along the upper face surface (35) of the perforated plate (23), the long edges extend parallel to one another and parallel to a longitudinal axis (53) of the recess (39);
Dependencies are inferred from the claim text.