Michael Henry Mccormick

US Patent:

52321673, Aug 3, 1993

Filed:

Nov 16, 1992

Appl. No.:

7/976757

Inventors:

Michael McCormick - Charleston SC
Kenneth J. Zwick - Philadelphia PA
Alwin Stegmaier - North Charleston SC

Assignee:

Robert Bosch GmbH - Stuttgart

International Classification:

F16K 3106
F02M 5100

US Classification:

2395855

Abstract:

An injection valve, which overcomes residual magnetic forces and cohesive forces that act between the armature and the core to make the armature stick to the core, impeding the closing motion of the valve needle. The injection valve has a spring adjusting sleeve and a stroke adjusting sleeve for the separate adjustment of the spring force of a restoring spring and of the stroke of the valve needle: these sleeves are disposed in a through bore of a valve end cap. The stroke of the valve needle is limited by a downstream end face of the stroke adjusting sleeve, which when the injection valve is fully open rests on an upstream face end of a fastening segment of the valve needle. A remanent air gap is left between the armature and the core. The novel injection valve is especially suitable for fuel injection systems of mixture-compressing internal combustion engines with externally supplied ignition.