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US 6,685,105 B1Granted
Fuel injection valve
AssigneeRobert Bosch GmbH
InventorsWolfgang Ruehle, Hubert Stier, Matthias Boee, Guenther Hohl, Norbert Keim
Life of this patent
Estimating the term…
Abstract
A fuel injector, in particular an injector for fuel injection systems in internal combustion engines, has a piezoelectric or magnetostrictive actuator, a valve closing body which can be operated by the actuator by way of a valve needle and which cooperates with a valve seat face to form a sealing seat, and having a hydraulic lifting device including two lifting cylinders that can move in opposite directions. The lifting device is a subassembly hermetically sealed off from a valve interior and has a housing having at least one section which is flexible in the axial direction.
Claims12
A fuel injector, comprising:
- one of a piezoelectric actuator and a magnetostrictive actuator;
- a valve needle;
- a valve seat face;
- a valve closing body that can be operated by the one of the piezoelectric actuator and the magnetostrictive actuator by way of the valve needle and that cooperates with the valve seat face to form a sealing seat;
- and
- a hydraulic lifting device including a first lifting cylinder and a second lifting cylinder, wherein:
- the hydraulic lifting device is a subassembly that is hermetically sealed off from a valve interior, and
- a housing of the hydraulic lifting device includes at least one section that is flexible in an axial direction.
5 more elements
A fuel injector, comprising:
- one of a piezoelectric actuator and a magnetostrictive actuator;
- a valve needle;
- a valve seat face;
- a valve closing body that can be operated by the one of the piezoelectric actuator and the magnetostrictive actuator by way of the valve needle and that cooperates with the valve seat face to form a sealing seat;
- a hydraulic lifting device including a first lifting cylinder and a second lifting cylinder;
- and
- a valve housing, wherein;
- the hydraulic lifting device is a subassembly that is hermetically sealed off from a valve interior,
- a housing of the hydraulic lifting device includes at least one section that is flexible in an axial direction,
- the housing of the hydraulic lifting device includes a stationary section connected to the valve housing,
- the at least one section that is flexible in the axial direction includes a first flexible section and a second flexible section,
- the first flexible section is fixedly connected to the stationary section and the first lifting cylinder, and
- the second flexible section is fixedly connected to the stationary section and one of the second lifting cylinder and the valve needle that is operated by the second lifting cylinder.
10 more elements
A fuel injector, comprising:
- one of a piezoelectric actuator and a magnetostrictive actuator;
- a valve needle;
- a valve seat face;
- a valve closing body that can be operated by the one of the piezoelectric actuator and the magnetostrictive actuator by way of the valve needle and that cooperates with the valve seat face to form a sealing seat;
- and
- a hydraulic lifting device including a first lifting cylinder and a second lifting cylinder, wherein:
- the hydraulic lifting device is a subassembly that is hermetically sealed off from a valve interior,
- a housing of the hydraulic lifting device includes at least one section that is flexible in an axial direction,
- the first lifting cylinder and the second movable lifting cylinder are movable in opposite directions, and
- the first lifting cylinder and the second movable lifting cylinder are encapsulated in the housing of the hydraulic lifting device.
7 more elements
A fuel injector, comprising:
- one of a piezoelectric actuator and a magnetostrictive actuator;
- a valve needle;
- a valve seat face;
- a valve closing body that can be operated by the one of the piezoelectric actuator and the magnetostrictive actuator by way of the valve needle and that cooperates with the valve seat face to form a sealing seat;
- a hydraulic lifting device including a first lifting cylinder and a second lifting cylinder;
- and
- a closing spring secured between the first lifting cylinder and the second lifting cylinder, wherein:
- the hydraulic lifting device is a subassembly that is hermetically sealed off from a valve interior, and
- a housing of the hydraulic lifting device includes at least one section that is flexible in an axial direction.
6 more elements
A fuel injector, comprising:
- one of a piezoelectric actuator and a magnetostrictive actuator;
- a valve needle;
- a valve seat face;
- a valve closing body that can be operated by the one of the piezoelectric actuator and the magnetostrictive actuator by way of the valve needle and that cooperates with the valve seat face to form a sealing seat;
- and
- a hydraulic lifting device including a first lifting cylinder and a second lifting cylinder, wherein:
- the hydraulic lifting device is a subassembly that is hermetically sealed off from a valve interior,
- a housing of the hydraulic lifting device includes at least one section that is flexible in an axial direction, and
- the first lifting cylinder, the second lifting cylinder, and a stationary section of the hydraulic lifting device enclose a transfer volume filled with a hydraulic medium.
6 more elements
Dependencies are inferred from the claim text.