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US 4,907,745 AGranted
Fuel injection valve and method for adjusting it
AssigneeRobert Bosch GmbH
InventorAnton Messingschlager
Life of this patent
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AssigneeRobert Bosch GmbH
InventorAnton Messingschlager
Estimating the term…
A fuel injection valve and a method for adjusting its fuel quantity are proposed. The fuel injection valve is used to inject fuel into the intake system of a mixture-compressing internal combustion engine having externally supplied ignition. It has a valve needle, which when a magnet coil is excited is attracted toward a core by an armature connected to the valve needle, whereupon the valve needle with a sealing seat formed on it, lifts away from a valve seat face embodied on a nozzle body. According to the invention, the nozzle body is closed off by a bottom embodied in the form of a small plate, which is part of the nozzle body and in which a plurality of calibrated injection ports are located. The closure of the valve needle is embodied by a tang, which extends as far as the immediate vicinity of the bottom. The injection ports are produced by erosion thereof, while their calibration for the sake of static fuel quantity adaptation is performed by hydraulic grinding with a flowable grinding medium.
A fuel injection valve comprising a housing, a magnet coil disposed in said housing, an armature that can be acted upon by the force of the magnet coil, a nozzle body secured to said housing, said nozzle body including a valve seat having a valve seat face, a valve closing element (27) connected to said armature which in combination with said valve seat face controls an opening or closing of said fuel injection valve, said valve closing element being guided by interior walls of said nozzle body, a plate located downstream of said valve seat, a plurality of injection ports (55) in said plate, said plate and said nozzle body (9) being formed as a single component and said plate being embodied as a thin-walled bottom (50) of said single component and having inner and outer walls 51 and 52, respectively, said valve closing element terminating upstream of said inner wall of said plate.
Dependencies are inferred from the claim text.