Ignition plugs.

摘要

A plasma ignition plug intended for use in association with a cylinder of an internal combustion engine and includes a body 11 containing a plasma medium flow system 15, 17 (27) said system comprising a cavity 15, a recess 17 (27) which communicates with the cavity 15 and from which, in use, plasma medium is forced into the cavity 15 by the piston of the engine during its compression stroke, an orifice 16 in the wall of the cavity, first and second electrodes 13, 14 between which, in use, a spark is struck in the cavity 15 to generate plasma in plasma medium contained in the cavity 15, said plasma issuing, in use, from the cavity 15 by way of said orifice 16, and, a conduit 19 in said body whereby plasma medium is supplied, in use, to said flow system.