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1. (WO2001038723) FUEL INJECTION VALVE FOR INTERNAL COMBUSTION ENGINES

Pub. No.:    WO/2001/038723    International Application No.:    PCT/DE2000/003798
Publication Date: Fri Jun 01 01:59:59 CEST 2001 International Filing Date: Sat Oct 28 01:59:59 CEST 2000
IPC: F02M 47/02
F02M 61/10
F02M 61/12
F02M 61/20
Applicants: ROBERT BOSCH GMBH
WAGNER, Werner
RUTHARDT, Siegfried
RAPP, Holger
Inventors: WAGNER, Werner
RUTHARDT, Siegfried
RAPP, Holger
Title: FUEL INJECTION VALVE FOR INTERNAL COMBUSTION ENGINES
Abstract:
The invention relates to a fuel injection valve with a valve member (5) that can be longitudinally displaced in a bore (7) against a closing force. Said valve member is guided in a combustion-chamber remote zone in the bore (7) and merges into a zone that is smaller in diameter in direction of the combustion chamber. Said latter zone and the wall of the bore (7) define a pressure chamber (20) between them that is filled with fuel. At the combustion-chamber end of the valve member (5) a valve stem (24) is configured that interacts with a valve seat (22) disposed at the end of the bore (7), thereby controlling at least one injection opening (28). The valve member (5) is provided with a blind bore (60) that extends coaxially relative to its longitudinal axis. Said blind bore is open towards the end facing away from the valve-seat and a pressure pin (4) projects into said bore, said pressure pin resting on the end of the blind bore (60) that is configured as a support surface (62). The pressure pin (4) projects over the combustion-chamber remote end of the valve member (5) and transmits the closing force to the valve member (5) so that said valve member, when brought out of axis with the bore (7), is subjected to less wear and has a more even injection behavior due to the reduction of tilting moments.