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1. (WO2017032485) ACTUATOR FOR A FUEL INJECTOR, AND FUEL INJECTOR

Pub. No.:    WO/2017/032485    International Application No.:    PCT/EP2016/064882
Publication Date: Fri Mar 03 00:59:59 CET 2017 International Filing Date: Tue Jun 28 01:59:59 CEST 2016
IPC: F02M 47/04
F02M 51/06
F02M 61/16
Applicants: ROBERT BOSCH GMBH
Inventors: SENGSEIS, Georg
Title: ACTUATOR FOR A FUEL INJECTOR, AND FUEL INJECTOR
Abstract:
The invention relates to an actuator for a fuel injector, in particular a common rail injector, comprising a magnetic coil (1) surrounding an opening, wherein a piston (2) is inserted in the opening, which piston at least in some sections consists of a first magnetostrictive material, so the piston (2) experiences an elastic length change under the effect of a magnetic field produced by the magnetic coil (1). According to the invention, a pipe body (3) is arranged between the magnetic coil (1) and the piston (2), on which the piston (2) is supported in the axial direction, wherein the pipe body (3) at least in some sections consists of a second magnetostrictive material so that the pipe body (3) experiences an elastic length change parallel to the piston (2) under the effect of a magnetic field produced by the magnetic coil (1), wherein the magnetostrictive materials of the piston (2) and of the pipe body (3) behave in opposing manners under the effect of the magnetic field. The invention also relates to a fuel injector comprising such an actuator.