Spark plugs, cylinder heads and engines

Abstract

The present invention relates to a spark plug in which a center electrode is at least partially disposed within an inner bore of an insulator, one end of a ground electrode is attached to said casing, and the other end extends radially beyond said firing end of the center electrode and into the casing Axial gap D is defined between the lower part of the axial end of the body and the axial end of the shell 轴向 . In this way, the gap between the center electrode and the ground electrode after the ground electrode is welded to the shell can be limited, the gap between the ground electrode and the center electrode can be avoided from being too small, the ignition stability can be improved, misfire can be avoided, and the reliability and service life of the spark plug can be improved. improve. And when the special combustion conditions in the cylinder occur, the stress of the ground electrode increases, and the ground electrode bends outward, and the other end of the ground electrode can radially abut against the axial end of the casing, thereby preventing the ground electrode from transitioning outward bending. The ignition gap becomes larger, which solves the problem of poor ignition stability of the engine and serious misfire caused by the larger ignition gap.

Description

technical field [0001] The invention relates to the technical field of automobile engine systems, in particular to a spark plug, a cylinder head and an engine. Background technique [0002] With the continuous reform of the national energy policy, especially the proposal and upgrade of the new energy development strategy, as well as the increasingly stringent regulations on fuel consumption and emission of automobiles, cleaner emission levels and higher combustion thermal efficiency are inevitable requirements for technological upgrading, and are also The core point of technological competition among automobile companies. At present, for existing natural gas engines, once the combustion conditions of the engine change, the combustion temperature rises, or the number and degree of cold and heat shocks increase, the ignition performance of the engine will decrease, and in severe cases, it will misfire, which will lead to carbon deposition, poor combustion, and increased fuel c...

AI Technical Summary

Problems solved by technology

[0003] Based on this, it is necessary to provide a spark plug that can solve the problem of engine ignition performance degradation and even misfire caused by the change of the ignition gap of the spark plug.

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