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US 4,285,471 AGranted
Fuel injection nozzle
AssigneeRobert Bosch GmbH
InventorsEwald Eblen, Karl Hofmann, Odon Kopse
Life of this patent
Estimating the term…
Abstract
The invention relates to a fuel injection nozzle in which a control piston acts on the valve needle, which control piston can also be acted upon by another fluid with an arbitrarily changeable pressure. In this manner it is relatively simple to meet the ever increasing requirements to apply an influence of engine characteristic values to the fuel injection process.
Claims11
A fuel injection nozzle for internal combustion engines comprising,
- a nozzle body having a first set of fuel injection openings and fuel inlet means for applying pressurized fuel to said first set of injection openings,
- a slidable valve needle in said nozzle body,
- means for applying a closing force to said valve needle against which said valve needle opens for moving said valve needle into closing relationship with said first set of injection openings,
- a control piston slidably disposed in said nozzle body for acting at one side on said valve needle,
- a spring chamber in said nozzle body,
- inlet means in said nozzle body for applying a pressurized control fluid from an associated source of fluid pressure on a side facing said valve needle in said spring chamber to said control piston, and
- means for controlling said control fluid pressure independently of the fuel being discharged from said fuel injection nozzle through said first set of injection openings.
4 more elements
A fuel injection nozzle for internal combustion engines comprising,
- a nozzle body having a first set of fuel injection openings and fuel inlet means for applying pressurized fuel to said first set of injection openings,
- a slidable valve needle in said nozzle body,
- spring means for applying a closing force to said valve needle against which said valve needle opens for moving said valve needle into closing relationship with said first set of injection openings,
- a control piston slidably disposed in said nozzle body for acting at one side on said valve needle,
- a spring chamber in said nozzle body,
- inlet means in said nozzle body for applying a pressurized control fluid from an associated source of fluid pressure on a side facing said valve needle in said spring chamber to said control piston, and
- means for controlling said control fluid pressure independently of the pressure of said pressurized fuel suppliedfrom said fuel inlet means to said first set of injection openings.
4 more elements
Dependencies are inferred from the claim text.