Fuel injector
AssigneeRobert Bosch GmbH
InventorsMartin Maier, Gunter Dantes, Detlef Nowak, Jorg Heyse
Life of this patent
Estimating the term…
Abstract
The present invention relates to a fuel injector, particularly a high-pressure injection valve for the direct injection of fuel into a combustion chamber of an internal combustion engine having external ignition, which is distinguished in that an outlet orifice (23) is provided downstream from the valve seat (20) which, at its downstream end, has a slot-forming element (30) that largely closes off the outlet orifice (23). Between it and a front face (34) of the valve-seat member (16), the slot-forming element (30) leaves open a slot-shaped flow outlet (35), through which a fuel spray may be spray-discharged in a fan-jet pattern.
Claims11
A fuel injector for fuel injection systems of internal combustion engines, in particular for the direct injection of fuel into a combustion chamber of an internal combustion engine, comprising a longitudinal valve axis (2), an actuator (10, 11, 12), a movable valve part (5, 7), which cooperates with a stationary valve seat (20) formed at a valve-seat member (16) to open and close the valve, and an outlet orifice (23) formed downstream from the valve seat (20) in the valve-seat member (16),
- wherein a slot-forming element (30) which largely closes the outlet orifice (23) is located at the downstream end of the outlet orifice (23), leaving open a slot-shaped flow outlet (35) between itself and a front face (34) of the valve-seat member (16).
The fuel injector as recited in one of the preceding claims,
- wherein the slot-forming element (30) is mounted directly on the valve-seat member (16).
The fuel injector as recited in one of the preceding claims,
- wherein the flow outlet (35) is located away from the longitudinal valve axis (2).
The fuel injector as recited in one of the preceding claims,
- wherein the slot-forming element (30) is inclined at an angle, i.e. is positioned at an angle that deviates from the longitudinal valve axis (2) by 90°.
The fuel injector as recited in one of the preceding claims,
- wherein the slot-forming element (30) is plastically deformable during valve operation and the width of the flow outlet (35) is thus variably adjustable.
The fuel injector as recited in one of the preceding claims,
- wherein a disk-shaped support element (43) is mounted directly below the slot-forming element (30) to increase stiffness.
Dependencies are inferred from the claim text.