Injection valve for a fuel-injection system of an internal combu

Fluid sprinkling – spraying – and diffusing – Fluid pressure responsive discharge modifier* or flow... – Fuel injector or burner

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Details

239584, F02M 4500

Patent

active

056926839

ABSTRACT:
An injection valve for a fuel-injection system of an internal combustion engine, in particular of a diesel motor, has a valve housing, a multi-part valve member movably arranged in the housing, and at least one inlet opening terminating in a working cylinder, through which opening fuel is fed from a pressure chamber and which is provided for controlling the valve member by means of an electromagnetic valve. The multi-part valve member is enclosed by a damping chamber filled with fuel in the contact area between its nozzle needle that controls the injection opening and the at least one valve-member part lying thereabove. On one side, approximately clearance-free positioning fits are connected in front of or rather after the damping chamber with one formed between the nozzle needle and the valve housing and on the other side, one being formed between the valve-member part and the valve housing. When the injection valve is closed, a support providing spring force acting on the valve-member part guides same against the nozzle needle until their front sides contact one another, while these move apart when the injection opening is open due to the fuel flowing with a limited flow from the pressure chamber into the damping chamber. With this a significant damping of the nozzle needle is achieved which nozzle needle impacts with an increased closing speed in the valve tip. The damping is achieved since the nozzle tip of the valve tip does not have to absorb the accelerated mass of the valve-member parts lying above the nozzle needle during the direct impact of the nozzle needle.

REFERENCES:
patent: 4202500 (1980-05-01), Keiczek
patent: 4531676 (1985-07-01), Seifert et al.
patent: 4566635 (1986-01-01), Trachte
patent: 4911366 (1990-03-01), Prisner
patent: 4981267 (1991-01-01), Scott
patent: 5156132 (1992-10-01), Iwanaga

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