Fuel injection valve
AssigneeRobert Bosch GmbH
InventorsHubert Stier, Elmar Okrent, Ulrich Döbler
Life of this patent
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Abstract
A fuel injector (1) for the direct injection of fuel into the combustion chamber of an internal combustion engine has a piezoelectric actuator (2) which is encapsulated in an actuator housing (3); a valve needle (9) which is in operative connection with the actuator and on which a valve-closure member (11) is formed which forms a sealing seat together with a valve-seat surface (13); and a nozzle body (12) into which the actuator housing (3) is able to be inserted. The actuator housing (3) and the nozzle body (12) are sealed by a common connecting part (4), the connecting part (4) having a first and a second diameter step (19; 20).
Claims13
A fuel injector for a direct injection of a fuel into a combustion engine, comprising:
- an actuator housing;
- one of a piezoelectric actuator and a magnetostrictive actuator encapsulated in the actuator housing;
- a valve needle that is in operative connection with the one of the piezoelectric actuator and the magnetostrictive actuator;
- a valve-seat surface;
- a nozzle body into which is inserted the actuator housing;
- and
- a joint connecting part having graduated diameter steps and by which the actuator housing and the nozzle body are sealed on an inflow side, wherein:
- the joint connecting part includes a first diameter step that is connected to the actuator housing, and
- the joint connecting part includes a second diameter step that is connected to the nozzle body.
The fuel injector as recited in clam 1, wherein:
- the joint connecting part is produced by turning.
A fuel injector for a direct injection of a fuel into a combustion engine, comprising:
- an actuator housing;
- one of a piezoelectric actuator and a magnetostrictive actuator encapsulated in the actuator housing;
- a valve needle that is in operative connection with the one of the piezoelectric actuator and the magnetostrictive actuator;
- a valve-seat surface;
- a nozzle body into which is inserted the actuator housing;
- and
- a joint connecting part having graduated diameter steps and by which the actuator housing and the nozzle body are sealed on an inflow side, wherein:
- the joint connecting part includes a first diameter step that is connected to the actuator housing,
- the joint connecting part includes a second diameter step that is connected to the nozzle body, and
- the actuator housing is slipped over the first diameter step.
A fuel injector for a direct injection of a fuel into a combustion engine, comprising:
- an actuator housing;
- one of a piezoelectric actuator and a magnetostrictive actuator encapsulated in the actuator housing;
- a valve needle that is in operative connection with the one of the piezoelectric actuator and the magnetostrictive actuator;
- a valve-seat surface;
- a nozzle body into which is inserted the actuator housing;
- and
- a joint connecting part by which the actuator housing and the nozzle body are sealed, wherein:
- the joint connecting part includes a first diameter step that is connected to the actuator housing,
- the joint connecting part includes a second diameter step that is connected to the nozzle body, and
- the nozzle body is slipped over the second diameter step.
A fuel injector for a direct injection of a fuel into a combustion engine, comprising:
- an actuator housing;
- one of a piezoelectric actuator and a magnetostrictive actuator encapsulated in the actuator housing;
- a valve needle that is in operative connection with the one of the piezoelectric actuator and the magnetostrictive actuator;
- a valve-seat surface;
- a nozzle body into which is inserted the actuator housing;
- and
- a joint connecting part by which the actuator housing and the nozzle body are sealed, wherein:
- the joint connecting part includes a first diameter step that is connected to the actuator housing,
- the joint connecting part includes a second diameter step that is connected to the nozzle body, and
- the second diameter step has a larger diameter than that of the first diameter step.
A fuel injector for a direct injection of a fuel into a combustion engine, comprising:
- an actuator housing;
- one of a piezoelectric actuator and a magnetostrictive actuator encapsulated in the actuator housing;
- a valve needle that is in operative connection with the one of the piezoelectric actuator and the magnetostrictive actuator;
- a valve-seat surface;
- a nozzle body into which is inserted the actuator housing;
- and
- a joint connecting part by which the actuator housing and the nozzle body are sealed, wherein:
- the joint connecting part includes a first diameter step that is connected to the actuator housing,
- the joint connecting part includes a second diameter step that is connected to the nozzle body, and
- on an inflow side, the one of the piezoelectric actuator and the magnetostrictive actuator is braced on the joint connecting part.
A fuel injector for a direct injection of a fuel into a combustion engine, comprising:
- an end plate,
- an actuator housing;
- one of a piezoelectric actuator and a magnetostrictive actuator encapsulated in the actuator housing;
- a valve needle that is in operative connection with the one of the piezoelectric actuator and the magnetostrictive actuator;
- a valve-seat surface;
- a nozzle body into which is inserted the actuator housing;
- and
- a joint connecting part by which the actuator housing and the nozzle body are sealed, wherein:
- the joint connecting part includes a first diameter step that is connected to the actuator housing,
- the joint connecting part includes a second diameter step that is connected to the nozzle body, and
- on a discharge side, the one of the piezoelectric actuator and the magnetostrictive actuator is braced on the end plate.
Dependencies are inferred from the claim text.