| 摘要 |
<p>A spark plug for use with an internal combustion engine consists of an electrically conductive hollow body, a dielectric core member located within said body and through which extends a first electrode having a tip portion projecting below the core member, and a second electrode forming an open cage surrounding the first electrode tip portion and having a tip portion directed towards and spaced from the first electrode to provide a defined spark gap between the respective tip portions and within the open cage. The open cage, when the spark plug is contained in a cylinder of an internal combustion engine, providing a prechamber in open communication with the cylinder and in which a portion of a petrol/air combustion mixture contained in the cylinder is preheated and ignited prior to ignition of the bulk of the mixture by the combustion gases formed in the prechamber. The plug provides improved ignition especially with 'lean burn' engines.</p> |
