Fuel injector
AssigneeRobert Bosch GmbH
InventorsWolfgang Ruehle, Hubert Stier, Matthias Boee, Guenther Hohl, Norbert Keim
Life of this patent
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Abstract
A fuel injector, particularly an injector of an internal combustion engine, has a piezoelectric or magnetostrictive actuator which is arranged in an actuator chamber which is sealed against the fuel, the fuel injector having a valve-closure member which can be actuated by the actuator via a valve needle, and which cooperates with a valve-seat face to form a sealing seat. In this context, the seal for forming the permeation-resistant sealing contains at least two elastomer sealing devices arranged in tandem.
Claims6
A fuel injector for an injection system of an internal combustion system, comprising:
- a valve needle;
- a valve-seat face;
- a valve-closure member cooperating with the valve-seat face to form a sealing seat;
- an actuator chamber;
- an actuator for actuating the valve-closure member via the valve needle, the actuator being situated in the actuator chamber, the actuator being one of a piezoelectric actuator and a magnetostrictive actuator;
- a seal for forming a permeation-resistant sealing between the actuator chamber and fuel, the seal including at least two elastomer sealing devices arranged in tandem;
- a first supporting element, a first of the at least two elastomer sealing devices supporting itself against the first supporting element;
- a valve body, the first supporting element supporting itself against the valve body;
- and
- an actuator housing having a pot-shaped design and being axially movable with respect to the valve body, the actuator housing at least partially surrounding the actuator, the actuator housing being circularly surrounded at least sectionally by the at least two elastomer sealing devices.
A fuel injector for an injection system of an internal combustion engine, comprising:
- a valve needle;
- a valve-seat face;
- a valve-closure member cooperating with the valve seat face to form a sealing seat, the valve needle and the valve seat directly controlling a flow of fuel out of the injector;
- an actuator chamber;
- an actuator for actuating the valve-closure member via the valve needle, the actuator being situated in the actuator chamber, the actuator being one of a piezoelectric actuator and a magnetostrictive actuator;
- a seal for forming a permeation-resistant sealing between the actuator chamber and fuel, the seal including at least two elastomer sealing devices arranged in tandem;
- a first supporting element, a first of the at least two elastomer sealing devices supporting itself against the first supporting element;
- and
- a second supporting element situated between the first elastomer sealing device and a second of the at least two elastomer sealing devices.
A fuel injector for an injection system of an internal combustion engine, comprising:
- a valve needle;
- a valve-seat face;
- a valve-closure member cooperating with the valve-seat face to form a sealing seat, the valve needle and the valve seat directly controlling a flow of fuel out of the injector;
- an actuator chamber;
- an actuator for actuating the valve-closure member via the valve needle, the actuator being situated in the actuator chamber, the actuator being one of a piezoelectric actuator and a magnetostrictive actuator;
- a seal for forming a permeation-resistant sealing between the actuator chamber and fuel, the seal including at least two elastomer sealing devices arranged in tandem;
- a first supporting element, a first of the at least two elastomer sealing devices supporting itself against the first supporting element;
- and
- a valve body, the first supporting element supporting itself against the valve body.
Dependencies are inferred from the claim text.