A sound distribution apparatus provides a driver with an audible impression of the operating speed, load and performance of a vehicle engine. The sound distribution apparatus includes an assembly of one or more sound transmission ducts (20,34) interconnect...

An attenuator for the air inlet tract of an internal combustion engine comprises an unobstructed tube (4) having a surrounding enclosure (9) divided into a primary chamber (11) in fluid communication with the inlet tube, and a secondary chamber (12) in flu...

The device has a pipe section (1) formed by two semi-shells (3, 4) partitioned with longitudinal partition walls extending from a bottom wall to a sealing surface of the respective semi-shells. The partition walls contact at their free edges (12). Each edg...

The invention relates to a sound absorber suitable for an air-flow conduit (1), wherein zones of the sound-bearing conduit thereof are provided with orifices, whose length in flow direction and whose width are dimensioned according to a predetermined size....

The attenuator for air noise, in particular, in the suction channel of an internal combustion engine comprises a duct (12) combined with a resonator chamber incorporating cutouts (13), partition walls (14) and a closure lid (14) distanced from the duct wal...

The gas flow pipe (1) has a pipe wall (5) containing micro perforation passages (2) with a diameter of less than 1-2 mm. The pipe is cylindrical, and the micro perforations (2) occupy maximum 10% of the total pipe wall (5) surface. The perforated pipe wall...

Low-noise integrated air-filtering device, including a casing (2), which has an inlet pipe (3) and an outlet pipe (4), and a filter element (5), which is set inside said casing (2). The integrated device is further provided with a silencer device (7) inclu...

A noise attenuation arrangement, particularly suitable for attenuating noise radiated by a conduit (10) carrying pressurised air from a turbo-compressor in an internal combustion engine, is in the form of cavities (14) (Figure 2) arranged around the outsid...