Fuel injection valve
AssigneeRobert Bosch GmbH
InventorsVolker Holzgrefe, Günther Hohl, Michael Hübel, Jürgen Stein
Life of this patent
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Abstract
A fuel injector for the injection of fuel into the combustion chamber of an internal combustion engine includes a valve needle guided in a nozzle body, the valve needle being actuable by an actuator and acted upon by a restoring spring in such a manner that a valve-closure member which is in operative connection to the valve needle is retained in sealing contact against a valve-seat surface. Formed at a downstream-side end of the fuel injector is a projection which projects beyond the valve-closure member of the fuel injector.
Claims1
A fuel injector for a direct injection of fuel into a combustion chamber of an internal combustion engine comprising:
- a nozzle body;
- a valve needle situated in the nozzle body, the valve needle having a fuel channel, through which fuel conveyed through an inflow-side central fuel feed is guided to a sealing seat;
- an actuator for actuating the valve needle;
- a valve-closure member, which cooperates with a valve seat surface to form the sealing seat and is in operative connection to the valve needle;
- a restoring spring acting upon the valve needle such that the valve-closure member is retained in sealing contact against the valve-seat surface in a non-actuated state of the actuator;
- a swirl chamber formed on the inflow side of the sealing seat into which the fuel channel opens;
- wherein the fuel injector at a discharge-side end of the nozzle body has a projection into which the valve-closure member is recessed in its entirety to form an annular structure projecting from the downstream side end of the fuel injector in a direction parallel to the longitudinal axis of the fuel injector, the projection having a recess, whose longitudinal axis is tilted relative to a longitudinal axis of the fuel injector, and which provides a slanted injection at an angle γ and has a slanted conical shape widening towards a discharge-side end of the fuel injector, resulting in an asymmetric shape of the nozzle body with respect to the longitudinal axis of the fuel injector in the region of the discharge side end;
- and
- wherein the projection is integrally formed with the nozzle body of the fuel injector.
Dependencies are inferred from the claim text.