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US 4,662,338 AGranted
Fuel injection nozzle
AssigneeRobert Bosch GmbH
InventorsKatsuoki Itoh, Iwan Komaroff
Life of this patent
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AssigneeRobert Bosch GmbH
InventorsKatsuoki Itoh, Iwan Komaroff
Estimating the term…
A fuel injection nozzle for internal combustion engines which has a valve needle loaded in the closing direction and is radially guided and supported in an axially displaceable manner within a nozzle body. The movement of the valve needle is effected in the opening and closing directions in a selectively variable manner, a spring-loaded supplementary mass which performs a dual function being disposed in the nozzle interior. In the opening direction of the valve needle, the supplementary mass is displaced along with the valve needle, while in the closing direction the two elements are separated. The supplementary mass influences the movement of the valve needle both inertially, as the result of its mass, and by effecting a speed-dependent damping, as the result of the positive displacement of a fluid from damping chambers, the whole being adapted to a constant or variable throttle disposed in the fuel inlet conduit.
A fuel injection nozzle for internal combustion engines having a spring loaded needle supported in an axially displaceable manner within a nozzle body and further including a spring-loaded supplementary damping mass which influences at least the needle opening movement, characterized in that a fuel throttle means is disposed in a fuel inlet line to said injection nozzle and that said supplementary damping mass is physically displaced from said spring loaded needle and cooperates with a damping chamber exposed to fuel flow, said supplementary damping mass being guided with a predetermined radial play to enable passage therethrough of fuel whereby valve needle supplementary damping is subjected to the inertia of said damping mass as well as being dependent on speed.
Dependencies are inferred from the claim text.