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1. (WO2001038722) FUEL INJECTION VALVE

Pub. No.:    WO/2001/038722    International Application No.:    PCT/DE2000/004142
Publication Date: Fri Jun 01 01:59:59 CEST 2001 International Filing Date: Fri Nov 24 00:59:59 CET 2000
IPC: F02B 75/12
F02M 51/06
F02M 61/20
Applicants: ROBERT BOSCH GMBH
STIER, Hubert
HOHL, Guenther
KEIM, Norbert
Inventors: STIER, Hubert
HOHL, Guenther
KEIM, Norbert
Title: FUEL INJECTION VALVE
Abstract:
The invention relates to a fuel injection valve (1), for fuel injection units on internal combustion engines, in particular, for direct injection of fuel into a combustion chamber of an internal combustion engine. Said fuel injection valve (1) comprises a magnetic coil (2), an armature (7), forced in a closing direction by a return spring (8) and a valve needle (10) connected non-positively to the armature (7), for operation of a valve closing body (11), which forms a sealing seat in cooperation with a valve seat surface (12). A disconnection spring (19) cooperates with the return spring (8), in such a way that the spring rates are additive. The return spring (8) is thus pre-tensioned over the total stroke (hges) of the armature (7) and the disconnection spring (19) is pre-tensioned over only a residual stroke (hges- hteil) of the armature (7), which is smaller than the total stroke (hges).