Bougie d'allumage a electrode-navette
OwnerVianney RABHIinventor
Life of this patent
Estimating the term…
Abstract
A spark plug with shuttle electrode is provided for an internal combustion engine which includes a combustion chamber in which a main charge diluted with a neutral gas is ignited, the spark plug housing a lamination cavity in which a central electrode opens and in which a lamination injector is able to inject under pressure a pilot charge consisting of an easily flammable combustive-AF fuel mixture, the cavity being connected to the combustion chamber by a lamination duct, while a shuttle electrode is interposed between the central electrode and a ground electrode and can translate in the lamination duct.
Claims22
A spark plug with shuttle electrode (1) for an internal combustion engine (2), said spark plug (1) comprising at least electrodes (6, 7) and a ceramic insulator (3) housed in a metal base (4) which has a base threading (5), said spark plug (1) also comprising a lamination cavity (15) connected to a combustion chamber (11) included in the internal combustion engine (2) through a lamination duct (16) while a lamination injector (17) can directly or indirectly inject into said cavity (15) a pilot charge (18) previously pressurized, said charge (18) consisting of an combustive-AF fuel mixture easily ignited by a spark, further comprising:
- at least one central electrode (6) which opens into the lamination cavity (15);
- at least one shuttle electrode (20) which is wholly or partly made of an electrically conductive material and which is partially or entirely housed with a small clearance in the lamination duct (16), said shuttle electrode (20) being interposed between the central electrode (6) and a ground electrode (7) and having both a chamber-side end (21) which faces the ground electrode (7) and which is exposed to the pressure prevailing in the combustion chamber (11) as well as a cavity-side end (22) which faces the central electrode (6) and which is exposed to the pressure prevailing in the lamination cavity (15), said shuttle electrode (20) capable of translating into said duct (16) under the effect of the gas pressure either towards the lamination cavity (15) when the pressure in the latter is lower than the pressure prevailing in the combustion chamber (11), or towards the combustion chamber (11) when the pressure in the latter is lower than the pressure prevailing in the lamination cavity (15);
- At least one cavity-side shuttle electrode abutment (23) which determines the position of the shuttle electrode (20) closest to the lamination cavity (15);
- At least one chamber-side shuttle electrode abutment (24) which determines the position of the shuttle electrode (20) closest to the combustion chamber (11).
ng to claim 1, wherein the shuttle electrode (20) consists of an insulating shuttle body (26) made of an electrically insulating material, said body (26) being crossed throughout its length by a conductive core (27) of which it is integral, said core (27) being made of an electrically conductive material, a first end (28) of said core (27) facing the ground electrode (7) while a second end (29) of said core (27) faces the central electrode (6).
The spark plug with shuttle electrode
g to claim 13, wherein the insulating sleeve (25) protrudes from the metal base (4) to present a protruding ejection dome (47) from which the gas ejection orifice (38) opens.
The spark plug with shuttle electrode
Dependencies are inferred from the claim text.