What is a spark plug? What is a spark plug

The role of a spark plug in an automobile is to introduce a high-voltage electric current into the cylinder to produce an electric spark to ignite the combustible gas mixture. It is mainly composed of a wiring nut, an insulator, a wiring screw, a central electrode, a side electrode and a shell, and the side electrode is welded to the shell.

The thermal characteristics of a spark plug are usually characterized by the calorific value of the spark plug, which indicates the balance between heat absorption and heat dissipation of the skirt of the spark plug insulator, and the higher the calorific value. The stronger the balance between heat absorption and heat dissipation, the lower the calorific value of the hot spark plug and the higher the calorific value of the cold spark plug.

Generally, the engine with high power and large compression ratio uses cold spark plugs with high calorific value; Conversely, engines with low power and low compression ratios use thermal spark plugs with low calorific value. Generally, the selection of spark plugs is determined by the factory through product finalization experiments, and should not be replaced at will.

The function of the spark plug is to ignite the mixture in the gas cylinder and do the work of combustion.

Spark plugs, commonly known as fire nozzles. [1] The function of the spark plug is to send a pulse high-voltage electrical discharge from the high-voltage wire (nozzle wire) to penetrate the air between the two electrodes of the spark plug and generate an electric spark to ignite the mixed gas in the cylinder. The main types are:

Quasi-type spark plugs, edge body protruding spark plugs, electrode type spark plugs, seat type spark plugs, polar type spark plugs, surface jumping fire type spark plugs, etc. The spark plug works with the ignition system and the oil supply system to make the engine work, which determines the performance of the engine to a large extent.

The rest of the system generates timed, high-voltage electrical pulses that form sparks and generate the energy needed to power the engine.

The structure of the spark plug is made of a slender metal electric plate through a ceramic material with insulating function, and there is a metal shell around the lower part of the insulator, which is screwed on the cylinder head in a screw way, and an electrode is welded at the bottom of the metal shell to form a grounding effect with the automobile body. In addition, the ends of the electrodes** must be separated by a small discharge gap.

Then, the high-voltage current from the distributor will pass through this ** electrode to conduct electricity, and then discharge in the discharge gap at the bottom end, at this time, the spark plug will play its role to produce a spark combustion mixture, and the engine will get energy and output power.

It can be seen that the spark plug is a device that ignites the gasoline and air mixture gas that enters the engine combustion, works under the harsh conditions of high temperature and high pressure, and is one of the wearing parts of the gasoline engine, which plays a very important role in the operation of the engine, and whether the car is fuel-efficient or not, whether the operation is stable, has a great relationship.

A spark plug is a part of the ignition system that is used to ignite the gas mixture inside the gas cylinder.

The spark plug, commonly known as the fire nozzle, is used to discharge the pulse high-voltage electric discharge from the high-voltage wire, penetrate the air between the two electrodes of the spark plug, and produce an electric spark to induce the mixed gas in the gas cylinder. The main types are: quasi-type spark plugs, edge body protruding spark plugs, electrode type spark plugs, seat type spark plugs, polar type spark plugs, surface jump fire type spark plugs, etc.

The function of the spark plug is to introduce tens of thousands of volts of high-voltage electricity into the combustion chamber, and generate an electric spark to ignite the mixture, and cooperate with the ignition system and oil supply system to make the Mingque engine work, to a large extent, the performance of the common motive.

The main species. According to the calorific value, there are cold type and hot type; According to the electrode material, there are nickel alloys, silver alloys and platinum alloys; If you are more professional, the types of spark plugs are generally as follows:

1. Quasi-type fire annihilation silver flower plug: the skirt of the insulator is slightly retracted into the end face of the shell, and the side electrode is outside the end face of the shell, which is the most widely used.

2. Spark plug with protruding edge: the skirt of the insulator is long, protruding beyond the end face of the shell. It has the advantages of large heat absorption, good anti-fouling ability, etc., and can be directly cooled by the intake air to reduce the temperature, so it is not easy to cause hot spot fire, so the thermal adaptation range is wide.

3. Electrode spark plug: its electrode is very thin, characterized by strong sparks, good ignition ability, and can ensure that the engine is fast and reliable in the cold season.

Starting, wide thermal range, can meet a variety of purposes.

4. Seat-type spark plug: its shell and screw-in thread are made into a cone, so it can maintain a good seal without a washer, thereby reducing the volume of the spark plug and making it more beneficial to the design of the engine.

5. Polar spark plug: the side electrode is generally two or more than two, the advantage is that the ignition is reliable, and the gap does not need to be adjusted frequently, so it is often used in some gasoline engines where the electrode is easy to ablate and the spark plug gap can not be adjusted frequently.

6. Surface skip type spark plug: that is, along the surface gap type, it is the coldest type of spark plug, and the gap between the central electrode and the end face of the shell is concentric.

Spark plugs belong to the ignition system of automobile engines. This part is fixed to the cylinder head, and the spark plug is connected to the ignition coil. At the end of the engine's compression stroke, the spark plug releases an electric spark, at which point the combustible mixture in the cylinder is ignited so that the engine can do work.

The spark plug is threaded to the cylinder head and is a wearing part that needs to be replaced regularly.

If the spark is used for a long time, the electrode gap will become larger, which will affect the ignition energy.

Long-term use of spark plugs will generate carbon deposits on the electrodes, which will also affect the ignition energy.

If the ignition energy becomes weak, it will affect the combustion of the engine, resulting in the phenomenon of poor engine power.

It is recommended that you replace the spark plugs regularly when you use the car.

After removing the spark plug, you need to seal the rubber hole where the spark plug is installed with a sticker, which can prevent foreign objects from falling into the cylinder.

When installing the spark plug, it is necessary to tighten the spark plug according to the specified torque using a torque wrench.

If it is not tightened, it will cause the cylinder to leak, and if it is tightened too tightly, it may cause the spark plug to rupture.

If the spark plug is ruptured, it can cause serious damage to the engine.

Therefore, attention must be paid to the installation and removal process of the spark plug.

Moreover, when buying spark plugs, you should choose the model that suits your car engine.

Spark plugs are specialized parts for engine ignition systems.