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，由于火花塞的頭部伸出較短，進(jìn)入燃燒室較淺，致使火焰噴射入燃燒室靠近上部1/3區(qū)域，引燃該1/3區(qū)域燃?xì)猓M(jìn)而擴(kuò)散燃燒，造成整個燃燒速度緩慢，燃燒效率較低。再次，呈螺旋形分布的噴孔孔道，噴射的初始火焰需要先撞擊在火花塞預(yù)燃室的內(nèi)壁，再通過螺旋形噴孔孔道噴射，具有一定的阻力，還降低了火焰的噴射速度和效率。

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.

預(yù)燃室火花塞外伸出火花塞安裝孔的長度較長，使預(yù)燃室火花塞的頂部延伸進(jìn)氣缸燃燒室的深度增加，使初始火焰噴射避開A區(qū)域，同時各噴孔之間的夾角增大，使初始火焰噴射靠近氣缸燃燒室中部，使整個燃燒室內(nèi)上部和下部的火焰?zhèn)鞑ニ俣群蜁r間趨于平衡，提高了整體火焰的傳動.

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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