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History of spark plug structure (1)

PubTime:2017-10-25

  As the spark plug and the engine between the relationship between the ever-changing engine technology is bound to promote the spark plug of continuous innovation.
  Through the development and progress of history, we can see the evolution and change of spark plug structure.
  1, the standard type and prominent spark plug
  The standard spark plug is a single side electrode spark plug that is slightly lower than the end of the housing thread. It uses the most widely used conventional ignition end structure of the side-mounted valve engine. In order to distinguish from the later "prominent type", this structure is called "standard type".
  The protruding spark plug was originally designed for the overhead valve, and its insulator skirt protrudes into the combustion chamber. In the combustion of the mixture to absorb more heat, idle at a higher operating temperature, to avoid fouling; high-speed valve due to the top, the suction air flow at the insulator skirt, its cooling, so that the maximum temperature increase , So the heat range is larger. High-grade spark plug is not suitable for side-mounted valve-type engine, because of its inlet and more turn, the airflow on the insulation of the skirt is not much.
  From the ignition effect, the spark should be the best place to flow in the mixture. The different structural designs of the engine combustor require different optimal ignition locations. The ignition position can be understood as the location of the spark gap in the combustion chamber, that is, the distance from the end of the spark electrode center electrode to the end of the housing.
  Ordinary protruding spark plug ignition position of 3mm, off-road racing and large displacement motorcycle use of "super-prominent" spark plug, ignition position up to 7 ~ 10mm. Ignition near the center of the combustion chamber, the flame propagation distance is shortened, which will shorten the combustion cycle and reduce the magnitude of the pressure change, is conducive to improving the engine power.
  2, single side pole with multi-side spark plug
  The conventional unilateral spark plug has a noticeable drawback that the side electrode covers the center electrode. When the high voltage discharge between the two poles, the mixture at the spark gap will absorb the spark heat and is activated by ionization to form a "fire nucleus". The location of the formation of the fire nuclei generally close to the side of the electrode, the heat will be more side electrode absorption, that is, the electrode "flame suppression", which reduces the spark energy, reducing the flashover performance.
  This article is organized by Guangzhou He Neng Auto Parts Co., Ltd.

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