Injector with high atomization capacity
AssigneeMagneti Marelli S.p.A.
InventorsMassimo Armaroli, Roberto Consolini
Life of this patent
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Abstract
A fuel injector is disclosed for high atomization capacity, and is of the single-jet air-assisted type in which a stop valve moved by an electromagnetic actuator controls the formation of fuel jets through atomization holes contained in a distributor element after which there is disposed an auxiliary atomization chamber. The auxiliary atomization chamber is delimited internally at least partially by a truncated conical surface onto which there opens substantially radial holes for the provision of auxiliary air, the truncated conical surface being defined by a mixer element disposed with a seal between the distributor element and a cap which is snap-fitted to a casing of the fuel injector.
Claims14
Injector with a high atomization capacity, in particular for the supply of a motor vehicle engine, the injector comprising:
- an electromagnetic actuator;
- a distributor element provided with at least one atomization hole;
- a stop valve controlled by said elelctromagnetic actuator to control the formation of at least one jet of fuel throughout said atomization hole;
- a casing having one axis of symmetry and housing said electromagnetic actuator, said distributor element and said stop valve;
- auxiliary atomization means disposed immediately after the distributor element and comprising a chamber (25) delimited internally at least partially by a truncated conical surface (28b) into which said atomization hole opens, and at least one substantially radial hole (29) which has an axis orthogonal to said truncated conical surface and which has one end opening laterally inside said chamber and the opposite end communicating with means for supplying an auxiliary air flow;
- wherein said auxiliary atomization means is carried by a mixer element, said mixer element being defined at least partially by said truncated conical surface, and by a cap partially defining said chamber;
- wherein said mixer element is fitted on and axially projects from said distributor element, and said cap being fitted axially on and projecting from said mixer element externally on said casing;
- wherein said distributor element comprises a plate fixed to said casing, said plate being provided with a central portion through which said at least one atomization hole is made, and said plate having a cavity (14) disposed after said at least one atomization hole and delimited by a first conical surface;
- and
- wherein said mixer element includes a truncated conical wall (23) that includes said truncated conical surface (28b) and is delimited externally by another conical surface (26), wherein said wall (23) is inserted into said cavity of said plate in such a way that said mixer element forms a fluid-tight seal between said first truncated conical surface of the distributor element and said truncated conical wall (23) of said mixer element, said another conical surface (26) having a lesser conicity than that of said first conical surface of the cavity (14) so as to form between said first conical surface and said another conical surface (26) an annular void (27) of pre-determined dimensions into which said auxiliary air flow emerges.
Dependencies are inferred from the claim text.