The utility model relates to a precombustion chamber spark plug installation structure, which comprises a cylinder head and a precombustion chamber spark plug. The side wall at the top of the precombustion chamber spark plug is provided with four first spray holes, which are connected with the precombustion chamber of the precombustion chamber spark plug. The four first spray holes are evenly divided into 360 ° circumference and extend along the radial direction of the precombustion chamber spark plug, and each first spray hole is inclined towards the top of the precombustion chamber spark plug α，α The top surface of the spark plug of the precombustion chamber is provided with a second spray hole, which is connected with the precombustion chamber of the spark plug of the precombustion chamber, the center line of the second spray hole is located on the same straight line as the center line of the spark plug of the precombustion chamber, and the cylinder head is provided with a spark plug mounting hole for assembling the spark plug, The pre combustion chamber spark plug is fixedly installed in the spark plug mounting hole of the cylinder head through thread fitting, the top of the pre combustion chamber spark plug extends out of the spark plug mounting hole, and the extension length h is 8? 12mm。

其次，由于火花塞的头部伸出较短，进入燃烧室较浅，致使火焰喷射入燃烧室靠近上部1/3区域，引燃该1/3区域燃气，进而扩散燃烧，造成整个燃烧速度缓慢，燃烧效率较低。再次，呈螺旋形分布的喷孔孔道，喷射的初始火焰需要先撞击在火花塞预燃室的内壁，再通过螺旋形喷孔孔道喷射，具有一定的阻力，还降低了火焰的喷射速度和效率。

Secondly, due to the short extension of the head of the spark plug and the shallow entry into the combustion chamber, the flame is sprayed into the upper 1 / 3 area of the combustion chamber, which first ignites the gas in the 1 / 3 area, and then diffuses the combustion, resulting in slow combustion speed and low combustion efficiency. Thirdly, for the spray hole channel with spiral distribution, the initial flame needs to hit the inner wall of the spark plug precombustion chamber first, and then spray through the spiral spray hole channel, which has a certain resistance and reduces the spray speed and efficiency of the flame.

预燃室火花塞外伸出火花塞安装孔的长度较长，使预燃室火花塞的顶部延伸进气缸燃烧室的深度增加，使初始火焰喷射避开A区域，同时各喷孔之间的夹角增大，使初始火焰喷射靠近气缸燃烧室中部，使整个燃烧室内上部和下部的火焰传播速度和时间趋于平衡，提高了整体火焰的传动.

The length of the spark plug mounting hole extending out of the spark plug of the precombustion chamber is long, so that the depth of the top of the spark plug of the precombustion chamber extending into the cylinder combustion chamber increases, so that the initial flame injection avoids area a, and the included angle between the first injection holes increases, so that the initial flame injection is close to the middle of the cylinder combustion chamber, so that the flame propagation speed and time in the upper and lower parts of the whole combustion chamber tend to balance, Improve the overall flame transmission

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