Fuel injection valve
AssigneeRobert Bosch GmbH
InventorsMartin Maier, Joerg Heyse
Life of this patent
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Abstract
A fuel injector, e.g., a fuel injector protruding directly into a combustion chamber of an internal combustion engine, includes an energizable actuator, a valve-closure member able to be moved by the actuator, a secure valve seat, with which the valve-closure member cooperates to open and close the valve, a fuel outlet formed in a downstream spray-discharge region and by at least one outlet opening situated downstream from valve seat, and a dead volume formed downstream from valve seat and upstream from the spray-discharge region having at least one outlet opening. A surface of valve-closure member bordering the dead volume has a surface structure having at least several pores with a surface roughness of at least 25 μm for gas accumulation.
Claims12
A fuel injector comprising:
- an energizable actuator;
- a valve-closure member configured to be moved by the actuator;
- a secure valve seat configured to cooperate with the valve-closure member to open and close the valve;
- a fuel outlet formed in a downstream spray-discharge region and by at least one outlet opening arranged downstream from the valve seat;
- and
- a dead volume formed downstream from the valve seat and upstream from the spray-discharge region having at least one outlet opening;
- wherein at least one surface of a component part bordering the dead volume includes a surface structure having direct access to the dead volume and at least several pores with a surface roughness of at least 25 μm configured to accumulate combustion chamber gas.
Dependencies are inferred from the claim text.