A power unit 6 includes an engine 6A. The engine 6A has a crankshaft 61. Further, the engine 6A has a crankcase 62 accommodating the crankshaft 61. A dynamic damper 200 is provided in the crankcase 62. The dynamic damper 200 includes a damper mass 210 and ...

The sound absorber has a perforated film (1) made from metal, where the perforated film is provided with a perforation. The film has holes (3) of the perforation with a hole diameter (d) between 0.5 millimeter and 1 millimeter. The hole diameter of the per...

The cover has an upper part (10) covering pulleys and a tension roller, and a lower part (11) covering a crankshaft pulley and a set of tension rollers and including a perforation (12) to pass the crankshaft pulley. The two parts are formed of thermo-compr...

The casing cover (1) has a peripheral edge (2) that is profiled to receive an elastomer seal (3). An axial extension (7) is oriented in the direction of the engine block and is disposed at an inner portion of the edge of the casing cover. The extension is ...

The casing cover (1) has a peripheral edge (2) that is profiled to receive an elastomer seal (3). An axial extension (7) is oriented in the direction of the engine block and is disposed at an inner portion of the edge of the casing cover. The extension is ...

In order to obtain an engine (10) having sound absorbing members capable of reducing the noise of the engine effectively, there is provided a shielding structure for a fuel injection pump (2a) comprising: shielding members substantially covering the surfac...

A soundproofing cover absorbs noises, produced by a vehicle. It is fastened to a plurality of vehicle-side installation portions, and includes a cover body (1), composed of a polymer foamed substance, and a plurality of brackets (2), held integrally to the...

A sound absorbing structure including a film with through holes formed is laminated on a porous member having communicating voids on the side facing a sound source. At least one of the through holes has an opening area of 19 mm or more, and the total of th...