Electric lamp and discharge devices – Spark plugs – With fluid feed or air vent
Patent
1985-09-12
1987-02-17
Moore, David K.
Electric lamp and discharge devices
Spark plugs
With fluid feed or air vent
313143, H01T 1332
Patent
active
046442189
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an improved spark plug assembly, and in particular, but not exclusively, to a spark plug assembly for an internal combustion engine.
BACKGROUND ART
Conventional spark plug assemblies suffer from a number of disadvantages, resulting in inefficient, ineffective and/or uneven cumbustion at or in the vicinity of the associated cylinder of the internal combustion engine, one result of which can be the build-up of undesirable carbon and/or other impurities on the electrodes of the spark plug assembly ultimately affecting the overall operation of the spark plug assembly. Known spark plug assemblies also have a tendency to produce undesirable "pre-ignition". Furthermore, known spark plug assemblies are also somewhat unreliable in "firing" unless the conditions prevailing in their immediate vicinity are correct, for example, the presence of substances such as oil have been found to prevent "firing".
Conventional spark plugs have also been found to suffer from heat transfer problems, particularly when associated with high-performance engines where it has been found that heat transfer through the spark plug assembly often results in undesirable over heating, and ultimately, damage to the insulator body of the plug.
As one example of known spark plug assemblies, attention is directed to Australian Patent Specification No. 159,863 which discloses a spark plug fitted with an adaptor defining a pre-combustion chamber. The spark plug employed therein was of a conventional design capable of working normally without the adaptor, although without the adaptor the plug suffered in performance as a result of the loss of the anti-fouling capability achieved with the adaptor. However, such a combination of spark plug and adaptor has now been found to result in a long heat transfer path, and with the advent of more sophisticated high-performance engines, arrangements such as those disclosed in the patent Specification No. 159,863 have been found to suffer as a result of the undesirable over-heating referred to above.
The present invention therefore seeks to alleviate the problems and disadvantages associated with known spark plug assemblies, and to provide a spark plug which will allow for even combustion of the combustible gases in the cylinder of an associated internal combustion engine.
DISCLOSURE OF THE INVENTION
The spark plug in accordance with the present invention incorporates means to define a special pre-combustion chamber for initial or preliminary combustion of combustible gases and for subsequently spreading the combustion with a desired rapidity, all without increasing the effective overall length of the spark plug assembly. In fact, with the assembly in accordance with the present invention, it is possible to reduce the overall length of the spark plug assembly. The spark plug assembly in accordance with the present invention furthermore minimises, if not eliminates altogether, the problems involved with over-heating.
In accordance with the present invention there is provided a spark plug adapted, in use, for association with an axial passage, said spark plug including; an insulator member having an electrode disposed centrally thereof and projecting outwardly from one end thereof; and an electrode member at said one end of said insulator member surrounding and spaced from said centrally disposed electrode, wherein said electrode member is so shaped to define, with the insulator member, a pre-combustion chamber surrounding the centrally disposed electrode, electrode member having an aperture to receive the extreme end of said centrally disposed electrode of said insulator member, said electrode member further including a plurality of additional separate apertures adjacent said central aperture, said additional apertures adapted to allow for fluid communication between the pre-combustion chamber and any said associated axial passage.
Apart from defining the pre-combustion chamber for the spark plug, the effect of which will be later described, the electrode also
REFERENCES:
patent: 1963801 (1934-06-01), O'Marra
patent: 3056899 (1962-10-01), Clayton
patent: 3076912 (1963-02-01), Novak et al.
patent: 3710772 (1973-01-01), Warner
Kirkhouse Jet Plug Pty. Ltd.
Moore David K.
Wieder K.
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