Electromagnetic fuel injector for an internal combustion engine with a monolithic tubular member
AssigneeMagneti Marelli Powertrain S.p.A.
InventorsMarcello Cristiani, Mirco Vignoli
Life of this patent
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Abstract
An electromagnetic fuel injector for an internal combustion engine, comprising a main body having a central cylindrical cavity adapted to act as a duct for the fuel, a valve which is disposed to close an end of the central cylindrical cavity and is provided with a moving shutter, an electromagnetic actuator which is provided with a coil, a fixed armature, and a moving armature mechanically connected to the shutter and adapted to be magnetically attracted by the fixed armature against the action of a spring, and a monolithic tubular member which is disposed coaxially within the central cylindrical cavity and houses the fixed armature and the moving armature.
Claims11
An electromagnetic fuel injector (1) for an internal combustion engine;
- the injector (1) comprising a main body (4) having a central cylindrical cavity (5) adapted to act as a duct for the fuel, a valve (6) which is disposed to close an end of the central cylindrical cavity (5) in order to regulate the flow of fuel and is provided with a moving shutter (9), and an electromagnetic actuator (13) which is provided with a coil (15) disposed coaxially about the central cylindrical cavity (5), a fixed armature (17) of ferromagnetic material, and a moving armature (18) of ferromagnetic material mechanically connected to the shutter (9) and adapted to be magnetically attracted by the fixed armature (17) against the action of a spring (19);
- the injector (1) further comprising a monolithic tubular member (24) which is made from ferromagnetic material, is disposed coaxially within the central cylindrical cavity (5) of the main body (4) and houses the fixed armature (17) and the moving armature (18) of the electromagnetic actuator (13);
- the injector (1) being characterised in that the fixed armature (17) and the moving armature (18) are made from a first ferromagnetic material, while the tubular member (24) is made from a second ferromagnetic material having a lower magnetic permeability than the first ferromagnetic material.
Dependencies are inferred from the claim text.