Pressure-controlled common rail fuel injector with graduated opening and closing behavior
AssigneeRobert Bosch GmbH
InventorFriedrich Boecking
Life of this patent
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Abstract
An injector for injecting fuel, which is at high pressure, into the combustion chamber of an internal combustion engine includes valve body movably received in an injector housing, and a slide region is embodied on it. The valve body further includes a seat diameter, which cooperates with a seat face embodied on the housing and by way of which a nozzle inlet to a nozzle chamber of an injection nozzle can be opened and closed. The valve body is embodied as a 3/3-way control valve, by way of whose slide region a control chamber that varies the stroke of a nozzle needle can be controlled.
Claims11
An injector for injecting fuel, which is at high pressure, into the combustion chamber of an internal combustion engine, the injector comprising, an injector housing, a valve body (7) which is movable in the injector housing (2) and on which both a slide region (13) and a seat diameter (8), the latter cooperating with a seat face on the housing, are embodied, by way of which said slide region and said seat diameter an inlet (12) to a nozzle chamber (28) of an injection nozzle can be opened and closed, the valve body (7) being embodied as a control valve, by way of whose slide region (13) a control chamber (21) that varies the stroke (33) of a nozzle needle (23) is controlled.
An injector for injecting fuel, which is at high pressure, into the combustion chamber of an internal combustion engine, the injector comprising, an injector housing, a valve body (7) which is movable in the injector housing (2) and on which both a slide region (13) and a seat diameter (8), the latter cooperating with a seat face on the housing, are embodied, by way of which said slide region and said seat diameter an inlet (12) to a nozzle chamber (28) of an injection nozzle can be opened and closed, the valve body (7) being embodied as a 3/3-way control valve, by way of whose slide region (13) a control chamber (21) that caries the stroke (33) of a nozzle needle (23) is controlled,
- wherein the slide region (13) of the valve body (7) has a transverse bore (15), and wherein the transverse bore (15) communicates with a leaking oil chamber (17) via an opening (16).
Dependencies are inferred from the claim text.