What is the cone angle of the exhaust valve?

The role of the exhaust valve is to exhaust the exhaust gas after combustion and dissipate heat. The role of the intake valve is to draw air into the engine and mix it with fuel for combustion.

The role of the valve is to be responsible for inputting fuel into the engine and exhausting exhaust gas. In the traditional engine, each cylinder has only one intake valve and one exhaust valve. This design structure is relatively simple, the cost is low, the maintenance is convenient, and the low-speed performance is good. The disadvantage is that the power is difficult to increase, especially at high speeds, the inflation efficiency is low and the performance is weak.

This article contains the following:

• Valve function

• What is the cone angle of the exhaust valve

• Status of valve

1.Valve function

The role of the valve is to be responsible for inputting air into the engine and exhausting the exhaust gas after combustion. From the engine structure, it is divided into intake valve and exhaust valve. The role of the intake valve is to draw air into the engine and mix it with fuel for combustion; the role of the exhaust valve is to exhaust the exhaust gas after combustion and dissipate heat.

2.What is the cone angle of the exhaust valve

The valve cone angle is the angle of the valve sealing surface, which is generally 45 °, and some are 30 ° (CA1091 sex car 6102 engine). The valve of 30 ° is considered to have the same lift, the valve taper is small, the valve passing surface is large, and the intake resistance is small, but the valve head edge with a small taper is thin, the rigidity is small, and the sealing and thermal conductivity are poor. For the intake valve. The thickness of the valve edge is generally 1 ~ 3mm, in order to prevent the valve seat from being damaged or damaged by high temperature during operation. In order to reduce intake resistance and improve cylinder intake efficiency, most engine intake valves are larger than exhaust valves. The color of the used intake and exhaust valves is also different.

The cone angle of the intake valve and exhaust valve of most brands of cars is 45 degrees, and a few are 30 degrees. This is related to the model road and is the choice of the designer. This cone angle is the sealing surface. For the same Accuracy comparison of the cone angle of the valve sealing surface. From a mechanical point of view, a cone angle of 30 degrees is more favorable than a cone angle of 45 degrees.

3.Status of valve

In order to improve the intake and exhaust efficiency, multi-valve technology is now used. It is common to arrange 4 valves per cylinder (there are also single-cylinder designs of 3 or 5 valves, the principle is the same, such as the Audi A6 engine), a total of 4 cylinders That is 16 valves. The "16V" we often see on the car data means that the engine has 16 valves. This multi-valve structure is easy to form a compact combustion chamber, and the fuel injector is arranged in the center, which can make the oil-gas mixture burn faster and more uniformly, the weight and opening of each valve are appropriately reduced, and the valve is opened or closed. faster.