Construction and thermal characteristics of motorcycle spark plugs
摘要：An engine is a device that generates energy by igniting and exploding a compressed mixture in the cylinder,
An engine is a device that generates energy by igniting and exploding a compressed mixture in the cylinder, and the component responsible for ignition in the combustion chamber is the spark plug. In the case where the compressed air pressure in the combustion chamber is very high and it is not easy to generate electric sparks, ensuring reliable ignition has a great impact on the engine's starting performance, fuel consumption, acceleration performance, and high running endurance performance. Due to the extremely harsh conditions of high temperature, high pressure, and high impact force that spark plugs work under, spark plugs must have high temperature resistance and high strength performance. This requires drivers to have a basic understanding of spark plugs, choose them correctly, and maintain them in a timely manner to keep their cars in good technical condition.
1、 Construction of spark plugs
Spark plugs are generally composed of a center electrode, side electrodes, threaded portion, insulator, spark plug housing, joint, sealing gasket, etc.
Central electrode: It is the electrode located at the center of the spark plug, and the power from the high-voltage wire is transmitted to this location and sparks are generated using the gap between the electrodes on the same side. The electrodes of high-performance spark plugs are finely processed and welded with platinum. In order to quickly discharge a large amount of heat energy, some spark plugs also have copper electrode plates installed inside the insulator at the center electrode.
Side electrode: The side electrode is an electrode connected to the threaded part of the spark plug, and is connected to the ground through the thread.
Threaded part: The threaded part is mainly used to fix the spark plug, support the side electrode, and also has a heat dissipation function. Different types of spark plugs or spark plugs of the same type are used in different engines, and their thread diameters and thread lengths vary. Therefore, spark plugs of the same type will also be classified according to different vehicle models.
Insulator: Insulators have both supporting properties and can prevent leakage of electrical energy. To extend the insulation distance and reduce the impact of dust and moisture on leakage between the joint and spark plug housing, the insulator is designed in a folded skirt shape.
Sealing gasket: The main function of the sealing gasket is to provide a good seal between the spark plug and the cylinder when tightening the spark plug. After repeatedly tightening or removing the same spark plug, the sealing effect of the gasket will be weakened.
The electrode part of the spark plug is the focus of use and maintenance. The shape of the center electrode and the end of the side electrode, as well as the gap formed between the two electrodes, are important factors affecting the ignition of the spark plug. 1. Side electrode: Central electrode factor. So when judging whether a spark plug can be used, first visually inspect whether its shape is intact and check Insulator: The gap between spark plugs can generally be measured using a thickness gauge to determine if the gap is appropriate.
2、 Thermal characteristics of spark plugs
Spark plugs can be classified into three types based on their thermal characteristics: cold type, warm type, and hot type. The insulation skirt of a cold spark plug is relatively short, with a small heating area and short heat dissipation distance. Therefore, under the same conditions, the working temperature of a cold spark plug is lower. The insulation skirt of the hot type spark plug is relatively long, with a large heating area and a long heat dissipation distance, resulting in a higher operating temperature. The working temperature of a warm spark plug is between that of a cold spark plug and a hot spark plug.
1、 Construction of spark plugs
Spark plugs are generally composed of a center electrode, side electrodes, threaded portion, insulator, spark plug housing, joint, sealing gasket, etc.
Central electrode: It is the electrode located at the center of the spark plug, and the power from the high-voltage wire is transmitted to this location and sparks are generated using the gap between the electrodes on the same side. The electrodes of high-performance spark plugs are finely processed and welded with platinum. In order to quickly discharge a large amount of heat energy, some spark plugs also have copper electrode plates installed inside the insulator at the center electrode.
Side electrode: The side electrode is an electrode connected to the threaded part of the spark plug, and is connected to the ground through the thread.
Threaded part: The threaded part is mainly used to fix the spark plug, support the side electrode, and also has a heat dissipation function. Different types of spark plugs or spark plugs of the same type are used in different engines, and their thread diameters and thread lengths vary. Therefore, spark plugs of the same type will also be classified according to different vehicle models.
Insulator: Insulators have both supporting properties and can prevent leakage of electrical energy. To extend the insulation distance and reduce the impact of dust and moisture on leakage between the joint and spark plug housing, the insulator is designed in a folded skirt shape.
Sealing gasket: The main function of the sealing gasket is to provide a good seal between the spark plug and the cylinder when tightening the spark plug. After repeatedly tightening or removing the same spark plug, the sealing effect of the gasket will be weakened.
The electrode part of the spark plug is the focus of use and maintenance. The shape of the center electrode and the end of the side electrode, as well as the gap formed between the two electrodes, are important factors affecting the ignition of the spark plug. 1. Side electrode: Central electrode factor. So when judging whether a spark plug can be used, first visually inspect whether its shape is intact and check Insulator: The gap between spark plugs can generally be measured using a thickness gauge to determine if the gap is appropriate.
2、 Thermal characteristics of spark plugs
Spark plugs can be classified into three types based on their thermal characteristics: cold type, warm type, and hot type. The insulation skirt of a cold spark plug is relatively short, with a small heating area and short heat dissipation distance. Therefore, under the same conditions, the working temperature of a cold spark plug is lower. The insulation skirt of the hot type spark plug is relatively long, with a large heating area and a long heat dissipation distance, resulting in a higher operating temperature. The working temperature of a warm spark plug is between that of a cold spark plug and a hot spark plug.
