Matrix S.r.l.

Matrix Gmbh

Microlys S.p.a.

Ing C. Olivetti C., S.p.a.

Mario Gaiardo

Francesco Bernardis

Contardo Adamoli

Franco Cretaz

Piercarlo Barbero

A system for feeding gas fuel to an internal combustion engine, having: a fuel tank; fluidic connector along which fuel flows, and interposed fluidically between the tank and a cylinder of the engine; and an electro-injector fluidically in series with respect to the fluidic connector, and which is interposed between the tank and the cylinder, and is activated selectively to disable or enable fuel flow to the cylinder; the electro-injector is positioned with respect to the fluidic connector solely by connecting at least an inlet or outlet of the electro-injector to at least one pipe defined by the fluidic connector.

Internal combustion engine gas fuel feed system, and relative electro-injector

A solenoid valve assembly for a combustible gas supply device to an endothermic engine is disclosed. The solenoid valve assembly includes a solenoid valve with at least one combustible gas outlet and an armature controlled by an electromagnet, the armature having an armature plate and a shutter. The armature plate rotates about a contact line. The armature plate is engaged by a bar pushed against the plate by a spring so as to normally keep the shutter in closed position. The solenoid valve assembly includes a hollow body that may be connected to an intermediate plate that may be connected to a closing plate module. The closing plate module carries a variable number of outlet conduits. The intermediate plate is provided with a series of grooves adapted to accommodate a series of different gaskets, each gasket corresponding to a closing plate module.

Solenoid valve assembly for a combustible gas supply device to an endothermic engine

The device comprises, for each selector element, a high-speed electromagnet having a fixed core with a single coil, and an armature consisting of a lightweight blade. When the coil is energized, the blade is moved into one position, and is restored to another position by means of a compression spring when the coil is de-energized, with a response time of less than 4 ms. The electromagnets are housed in the support of a selection assembly, and packed in at least two offset rows. Each coil is energized at a first voltage and is subsequently maintained energized at a lower voltage.

High speed electromagnet selection device for selecting the needles in a

A solenoid valve comprising an inlet conduit coaxial with an exhaust conduit; and an on-off element supported on the anchor of an electromagnet and moving substantially along the common axis of the two conduits for alternately connecting the inlet conduit and the exhaust conduit to an outlet conduit via a connecting compartment. The anchor normally closes the inlet conduit via flexible means, such as a permanent magnet in the magnetic circuit of the electromagnet, magnetized the opposite way to when the electromagnet is energized. The action of the electromagnet is such as to substantially eliminate that of the magnet on the anchor, which is thus set rapidly to the closed position over the exhaust conduit.

High-speed three-way solenoid valve for pressurized fluid, such as

A solenoid valve having an electromagnet arranged in a chamber into which an inlet duct and an outlet duct of the solenoid valve open, whereby the coil is constantly ventilated by the compressed air itself. The armature of the electromagnetic has a disc for shutting off the outlet duct and is formed by a plate which is urged into the closed position of the solenoid valve by the compressed air. The plate rotates about a beading of elastomeric material and exhibits extremely low inertia, whereby the solenoid valve can be operated at high frequency. The chamber can house a plurality of electromagnets, each of which controls a shut-off member for a corresponding outlet duct. The body also comprises an interchangeable shell which has funnel-shaped chambers for directing the air of at least one set of ducts to a common outlet aperture.

High-speed solenoid valve for a fluid under pressure, e.g. for pneumatic

A dot matrix print head of improved type is described the principal characteristic of which lies in the fact that the casing containing the electromagnets actuating the needles is clamped between the needle support body and a cover carrying on its interior the striker elements which, when attracted by the electromagnets, displace the needles; the casing is formed by an extruded metal tube body and by an element of plastics material between which are inserted, in appropriate grooves, stacks of U-shape laminations carrying at one end respective electrical windings constituting the electromagnets.

Dot matrix print head of improved type

A dot matrix print head is described having an improved type of electromagnetic actuator device for the print needles; the ends of the striker elements which cooperate with one of the poles of the electromagnetic drive for each needle are in fact shaped on the side facing the said pole, in such a way as to be displaced with respect to the point of contact of the striker element on the pole itself, so as to cause between this end and the pole a predetermined clearance capable of compensating possible constructional imprecisions. (FIG. 2).

Dot matrix print head

A wire printing head of ballistic type comprises a front guide fixed to a carriage and in which the printing wires are mounted in an axially slidable manner. The electromagnets for actuating the wires have their respective cores mounted inside a tube of non-magnetic material. In order to obtain high heat dissipation, the electromagnet cores and windings are embedded in a resin block which fills the interior of the tube. The exterior of the tube is also provided with a set of cooling fins. The electromagnet armatures are mounted on a rear cover which is connected by a screw to a part of the front guide, which in its turn is housed in a compartment in the resin block. Shims are disposed between the front guide and group of electromagnets, and their number can be varied in order to modify the distance of the ends of the printing wires from the platen.

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Ivrea, Italy

Mario Gaiardo