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US 4,356,977 AGranted
Fuel injection nozzle
AssigneeRobert Bosch GmbH
InventorKarl Hofmann
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AssigneeRobert Bosch GmbH
InventorKarl Hofmann
Estimating the term…
The invention relates to a fuel injection nozzle, in which at least two levers are disposed between the valve needle and the spring support plate of the closure spring, which levers are supported with one end on the housing and the other end on the valve needle, these levers being supported in the middle region on the spring support plate, thereby permitting a certain lever path. As a result it is attained that during this first lever path or a first stroke of the valve needle, because of the action of the levers, the closing force exerted by the spring on the valve needle is reduced in accordance with the lever translation. As a result of this intermediate-position control of the needle stroke, with the creation of a pressure step in consequence, cold-start hammering of the engine is avoided, and quieter operation is made possible, as a result of the resulting prolongation of injection time during idling and at partial load.
A fuel injection nozzle for internal combustion engines having a radially sealing valve needle axially displaceable by the fuel supplied under pressure and arranged to open in the opposite direction to the fuel flow, said valve needle stressed in the closing direction by a closure spring engaging the valve needle via a spring support plate, characterized in that at least two levers have portions arranged to contact a shelf area of an apertured member which encircles an area of said valve needle and another of said portions of said levers engage said spring supporting plate.
A fuel injection nozzle for internal combustion engines having a valve needle axially displaceable by the fuel supplied under pressure and stressed in the closing direction by a closure spring engaging the valve needle via a spring supporting plate, characterized in that the spring supporting plate engaging the valve needle via at least two levers each having end portions arranged to contact shelf areas on the valve housing and the valve needle and having an intermediate portion engages said spring supporting plate.
Dependencies are inferred from the claim text.