Fuel injection valve
AssigneeRobert Bosch GmbH
InventorHubert Stier
Life of this patent
Estimating the term…
Abstract
A fuel injector (1), especially an injector for fuel injection systems of internal combustion engines (51), has a piezoelectric or magnetostrictive actuator (14), a valve-closure member (8) that is actuated by an actuator (14) using a valve needle (9), the valve-closure member cooperating with a valve seat surface (7) to form a sealing seat, and having at least one spray-discharge opening (10, 11) that is sealed by the sealing seat. In this context, the valve seat surface (7) and/or the valve-closure member (8) has partial areas (30a, 30b) that are arranged so as to be offset on the circumference, the partial areas throttling a fuel flow to differing extents as a function of a stroke of the valve needle (9).
Claims9
A fuel injector, comprising:
- one of a piezoelectric actuator and a magnetostrictive actuator;
- a valve needle;
- a valve-closure member capable of being actuated by the one of the piezoelectric actuator and the magnetostrictive actuator in accordance with an operation of the valve needle;
- and
- a valve seat surface including at least two spray-discharge openings, the valve-closure member configured to cooperate with the valve seat surface to form a sealing seat that seals the at least two spray-discharge openings, wherein:
- at least one of the valve seat surface and the valve-closure member includes partial areas that are arranged so as to be offset on a circumference, and
- the partial areas throttle a fuel flow to differing extents through the spray-discharge openings as a function of a stroke of the valve needle.
A fuel injector, comprising:
- one of a piezoelectric actuator and a magnetostrictive actuator;
- a valve needle;
- a valve-closure member capable of being actuated by the one of the piezoelectric actuator and the magnetostrictive actuator in accordance with an operation of the valve needle;
- and
- a valve seat surface with which the valve-closure member cooperates to form a sealing seat that seals a spray-discharge opening;
- wherein at least one of the valve seat surface and the valve-closure member includes partial areas that are arranged so as to be offset on a circumference;
- wherein the partial areas throttle a fuel flow to differing extents as a function of a stroke of the valve needle;
- and
- wherein the valve-closure member is arranged to contact a sealing point of the valve seat surface in a closed position of the fuel injector, the sealing point arranged, with respect to a direction of flow, at a position downstream of the partial areas.
Dependencies are inferred from the claim text.