US 6,681,999 B1Granted

Fuel injection valve

AssigneeRobert Bosch GmbH

InventorsWolfgang Ruehle, Hubert Stier, Matthias Boee, Guenther Hohl, Norbert Keim

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Abstract

A fuel injector, in particular a fuel injector for fuel systems of internal combustion engines, has a piezoelectric or magnetostrictive actuator, a valve needle operated by the actuator by way of a hydraulic temperature compensation device, and a valve closing body operated by the valve needle and cooperating with a valve seat face to form a scaling seat. The temperature compensation device includes a needle driving sleeve which surrounds a valve needle shoulder of the valve needle and, together with a needle driving shoulder, surrounds the valve needle in sections. In addition, the needle driving sleeve together with the valve needle encloses a temperature compensation space, and the temperature compensation space is connected to a fuel inlet of the fuel injector through a directional valve for filling the temperature compensation space with fuel.

Claims13

Dependent claims

A fuel injector, comprising:

one of a piezoelectric actuator and a magnetostrictive actuator;
a hydraulic temperature compensation device;
a valve needle operable by the one of the piezoelectric actuator and magnetostrictive actuator via the hydraulic temperature compensation device;
a valve seat face;
a directional valve;
and
a valve closing body operable by the valve needle and cooperating with the valve seat face to form a sealing seat, wherein:
the hydraulic temperature compensation device includes a needle driving sleeve that surrounds a valve needle shoulder of the valve needle and, together with a needle driving shoulder, surrounds the valve needle in sections,
the needle driving sleeve together with the valve needle encloses a temperature compensation space, and
the temperature compensation space is connected to a fuel inlet of the fuel injector via the directional valve, the directional valve filling the temperature compensation space with a fuel.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/889,290Filed 20 Nov 2001
Priority: DE 199 54 80213 Nov 1999
Granted: 27 Jan 2004
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

F02M 51/0603
Injectors peculiar thereto with means directly operating the valve needle: using piezoelectric or magnetostrictive operating means
F02M 61/167
Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14: means for compensating clearance or thermal…
F02B 2075/125
Other methods of operation: direct injection in the combustion chamber for spark ignition engines, i.e. not in pre-combustion chamber
F02M 2200/706
With means for filling or emptying hydraulic chamber, e.g. for compensating clearance or thermal expansion: valves for filling or emptying…