| 摘要 |
<p>A silencer (12) consists of a duct (14) that acts as a guide and noise attenuator for the exhaust gases; it has at least one inner porous metal tube, such as a flat spring with overlapping coils, an intermediate mattress of thermal and acoustic insulation material, and an impermeable outer casing made by an extrusion/blowing operation. The silencer (12) consists of a duct (14) that acts as a guide and noise attenuator for the exhaust gases; it has at least one inner porous metal tube, such as a flat spring with overlapping coils, an intermediate mattress of thermal and acoustic insulation material, and an impermeable outer casing made by an extrusion/blowing operation. The porous metal tube can also be in the form of a spiral-wound strip with single or double coil interlock, or a perforated metal sleeve covered with a refractory fabric of a certain porosity, made from ceramic, basalt or glass fibres. It can also contain inner acoustic baffles in the form of three discs set perpendicular to the direction of the exhaust gas flow. The silencer is fastened to the vehicle chassis by rigid lugs (15).</p> |
