There is a plastic case under the accelerator of the car.

Aluminum shell has the strongest heat dissipation ability, which is very hot to the touch, indicating that the internal heat is reduced. Plastic products have high density and internal "heat preservation" performance, so the heat will not spread too fast.

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SMC valve cover is a kind of plastic valve cover, which has the advantages of reducing weight and consumption, reducing vibration and noise, low cost and satisfying complex structural design. This product is mainly used in automobile field.

Reducing engine noise is the key to reduce engine noise. The engine valve cover is directly connected with the engine, which bears and transmits the vibration and noise from the engine. Therefore, improving the sound insulation and absorption effect of valve cover is an effective means to reduce noise pollution. Compared with metal.

Plastics have better noise attenuation (the sound absorption coefficient of SMC is 0.2 1 and that of felt is 0.24) and damping (according to data, the intensity of sound transmission depends on the design of parts and the damping characteristics of materials used, and the internal damping of SMC is about 10 times higher than that of metal materials).