| 摘要 |
A conduit (10) for the air intake supply system of an internal combustion engine is formed by extrusion. Orifices (11) are pierced through the surface of the conduit to allow the passage of air therethrough. This prevents the formation of standing waves in the system, reducing the noise produced thereby. The orifices (11) may be pierced during the extrusion of the conduit (10), and may be in the form of holes or slits. The orifices (11) may be arranged in a regular pattern on the conduit surface, such as in rows, hoops or helices, or in a random pattern, or in a combination of different patterns. The orifices (11) may also be concentrated in specific areas on the conduit surface to improve the acoustic characteristics of the conduit. <IMAGE> |
