Abstract: The electroinjector according to the invention is provided with a small tubular armature, whose bottom wall is constituted by a plate, of material which resists deformation due to impact and directly fastened on to the cylindrical side wall of the same armature, with which a shutter of an injection nozzle is fixedly secured.

Abstract: An electrically operated injector provided with a mobile cup-shaped armature which acts as the closure element for the injection nozzle and is guided internally by a tubular element which also acts as a stop for the armature lifting stroke. The armature also has a base wall provided with bores with skew-inclined axes for feeding fuel to the injection nozzle.

Abstract: An electromagnetically actuated fuel-injector for an internal combustion engine is disclosed, in which the core (15) of the coil (16) for the cuplike valve member (37) intended reciprocably to control the fuel-injecting nozzle (48) is provided with longitudinally arranged radial bores (35) in order to minimize the detrimental effects of eddy currents. Longitudinal slots (52) can be provided in said coil core according to an alternative embodiment.

Abstract: A pulse generator is disclosed, intended to supply information as to the speed of rotation and the phasing of an internal combustion engine of the injection type, said generator comprising at least a magnetosensitive switching device formed by a magnetoresistive element positioned at a preselected location along a circumference, means for producing a magnetic field for switching said magnetosensitive switching device mechanically connected to the main shaft so as to be rotated at a speed proportional to the speed of rotation of the engine and with a preselected phase relationship with respect thereto, said magnetic field periodically influencing said switching device for a length of time and at a frequency which are a function of the engine speed of rotation and with a phase which is a function of the phase relationship aforementioned.