The structure and thermal characteristics of motorcycle spark plugs...

Release time: 2017-09-23 16:13:12

The engine is a device that generates energy by the explosion of the compressed gas in the cylinder, and the ignition element in the combustion chamber is the spark plug. In the combustion chamber compression pressure is very high, easy to produce spark in the case, can ensure that the ignition is reliable, which the engine start performance, fuel consumption, acceleration performance, high running endurance have a great impact. As the spark plug is in high temperature, high pressure, high impact of the very harsh conditions of work, so the spark plug must have high temperature and high strength performance. This requires the driver to have a basic understanding of the spark plug, so that the correct choice of spark plugs, timely maintenance of spark plugs to make your car in a good state of technology.
First, the structure of the spark plug
Spark plug is generally composed of central electrode, side electrode, thread part, insulator, spark plug shell, joint, gasket and so on.
Center electrode: is located in the center of the spark plug electrode, from the high-voltage wire power is transported to this site and the use of the same side of the gap between the electrode spark. High-performance spark plug electrodes are finely processed and made of platinum. In order to be able to quickly discharge a lot of heat, some spark plug center electrode is also installed inside the insulator electrode copper.
Side electrode: The side electrode is an electrode connected to the thread portion of the spark plug and is connected to the ground by thread.
Threaded part: thread is mainly used to fix the spark plug, and support the side of the electrode, but also has a cooling function. Different types of spark plugs or the same kind of spark plugs used in different engines, the thread diameter and thread length are different, so the same type of spark plugs will be different depending on the type of car and have a more fine classification.
Insulator: Insulator has both support performance, but also to prevent the leakage of electricity. Between the joint and the spark plug shell, in order to extend the insulation distance and reduce the dust, moisture on the impact of leakage, the insulator designed to be skirt.
Seal: The main role of the gasket is to tighten the spark plug, so that the spark plug and cylinder has a good seal. The sealing effect of the gasket will be weakened when the same spark plug is repeatedly screwed or removed.
The electrode part of the spark plug is the focus of use and maintenance. The shape of the center electrode and the side electrode tip and the gap formed between the two electrodes are important factors that affect the firing of the spark plug 1. Side electrode: Center electrode factor. Therefore, in determining whether the spark plug can be used, the first visual inspection of its shape is intact, check the 'Insulator: the gap between the gap is appropriate, generally with thick and thin gauge can measure the spark plug gap.
Second, the thermal characteristics of spark plugs
According to the different characteristics of the spark plug can be divided into cold type, warm type and heat type three. Cold type spark plug insulation skirt shorter, small heating area, heat dissipation is short, so under the same conditions, the cold spark plug operating temperature is low. Hot type spark plug insulation skirt longer, heated area, heat distance is long, so the working temperature is higher. The operating temperature of the temperature spark plug is between the cold type spark plug and the hot spark plug.
In the spark plug product model, the thermal characteristics of the spark plug are usually expressed in Arabic numerals. The number of the thermal characteristics of the spark plug is called the calorific value of the spark plug. The calorific value is the relative comparison value of the spark plug thermal characteristics. In China's spark plug product model, as well as in Japan NGK spark plug and ND spark plug product model, the cold type spark plugs larger calorific value, hot spark plugs smaller calorific value. Or, with the heat value from small to large, the thermal characteristics of the spark plug from the hot gradually cold.