Fuel injection valve
AssigneeRobert Bosch GmbH
InventorsHeinz Fuchs, G{umlaut over (u)}nter Dantes, Jörg Heyse
Life of this patent
Estimating the term…
Abstract
A fuel inject includes an orifice plate which is arranged on a valve-seat member, particularly at its downstream end face, the valve-seat member having a fixed valve seat, the orifice geometry of the orifice plate being bounded by the valve-seat member, so that the flow ratios in the orifice plate are influenced by the valve-seat member. The valve-seat member covers an upper inlet region of the orifice plate, at least to the extent that downstream outlet orifices of the orifice plate are overlapped. The fuel injector is particularly suited for use in fuel systems of mixture-compressing internal combustion engines with externally supplied ignition.
Claims9
A fuel injector for a fuel-injection system of an internal combustion engine, the fuel injector comprising:
- a valve-seat member having a fixed valve seat and a lower end face;
- a valve-closure member cooperating with the valve-seat member and being axially movable along a longitudinal valve axis of the fuel injector;
- and
- an orifice plate situated downstream from the valve-seat member, the orifice plate having an upper functional plane and a lower functional plane, the upper functional plane having a plurality of inlet openings and a first cross-sectional orifice geometry, the lower functional plane having a plurality of outlet orifices and a second cross-sectional orifice geometry, the first cross-sectional orifice geometry being different from the second cross-sectional orifice geometry,
- wherein a number of the inlet openings is equal to a number of the outlet orifices,
- wherein only one of the outlet orifices emanates from each of the inlet openings, and
- wherein each of the inlet openings is partially and directly covered by the lower end face of the valve-seat member for overlapping the outlet orifices with the valve-seat member.
Dependencies are inferred from the claim text.