Disclosed is a vehicular engine room manufacturing method wherein the engine room has excellent heat resistance and sound-absorbing characteristics, and scraps generated during the manufacturing process can be recycled. The vehicular engine room manufacturing method comprises the steps of: carding a thermoplastic fiber and a carbon fiber having a length of 10 to 150 mm and needle-punching the same, thereby forming a felt layer; applying heat and pressure to the felt layer, thereby forming a felt board; and applying heat to the felt board and shaping the same is formed in a desired shape.

A vehicle includes a vehicle interior, a front room provided in front of the vehicle interior with a dashboard interposed therebetween, a first protection target that is disposed along the dashboard and extends in an upper-lower direction, and a first protector that has a concave sectional shape and covers the first protection target toward the dashboard. The first protection target includes a curved portion curved along a curvature of the dashboard, and the first protector includes a bent portion that covers the curved portion, an upper extension portion that extends upward from the bent portion, and a lower extension portion that extends downward from the bent portion. The upper extension portion includes a first fixing portion that has a bolt insertion hole and is fixed to the dashboard, and the lower extension portion includes a second fixing portion that has a slit opened downward and is fixed to the dashboard.

The invention provides a heat shield for a heat- and sound-radiating component in a vehicle. The heat shield includes a carrier which has an inner side which, in the mounted state, faces the component and on which a continuous insulating material is arranged, for the absorption of heat and sound which are produced by the component. The carrier has a plurality of apertures in order to reduce sound radiation of the carrier. The provided embodiment and arrangement of the apertures, and the arrangement of the insulating material on the inner side significantly improve the sound- and heat-insulating properties of the heat shield.

A sound-insulation material for a vehicle has high rigidity and is capable of exhibiting sufficient sound insulation performance against noise having a frequency of 500 Hz to 5000 Hz generated in a vehicle, while maintaining low weight. The sound-insulation material for a vehicle of the present invention has a multilayer structure, the material including: a hard layer having tubular cells, the tubular cells being arranged in a plurality of rows; and a soft layer provided on one surface of the hard layer, in which a ratio of a dynamic spring constant Kd to a static spring constant Ks, of a structure having the hard layer and the soft layer, is 0<Kd/Ks1.5.

A head cover structured and arranged to cover at least part of a face of a cylinder head of an internal combustion engine is described. The head cover includes a chamber formation part structured and arranged to provide a chamber to restrain sound propagating through air from the cylinder head. The chamber formation part includes a partition part for partitioning the chamber from a space on a cylinder head side. The partition part has a convex part projecting into the chamber, and a through hole may be provided in the convex part that penetrates from the space on the cylinder head side to the chamber.

The invention relates to an acoustic sheild having a thermo-compressed shell based on fibres bound together by a thermoplastic binder to form a porous shell that has noise absorption properties. The shell has an internal face and an external face, and a sheet of metal for thermal protection against the engine. The sheet covers all or part of the internal face, the sheet is attached in a substantially fluidtight manner, essentially via its periphery to the shell. This creates a peripheral seal and maintains, except at the periphery, an air gap between the sheet and the shell, to protect the shell from the heat accumulated by the sheet.

The present invention aims to provide a sound-absorbing material having sound absorption performance with an average sound absorption coefficient of 0.65 or more in the frequency domain of 800 to 2000 Hz. The present invention relates to a sound-absorbing material including: a fiber layer including a plurality of holes open to a surface thereof and having a thickness of 3 mm or more; and an inorganic material layer formed on the surface of the fiber layer, the holes being blind holes each penetrating through the inorganic material layer and having a bottom inside the fiber layer.

A method and apparatus for noise reduction in a semi-truck tractor. The semi-truck tractor has hood cowling that is carried on an upper hood support mounted to a firewall of the semi-truck tractor. The invention includes applying a resilient sleeve to the upper hood support to eliminate a noise generated by vibration of the hood cowling when supported by the upper hood support. The resilient sleeve has an opening at a proximal end of the sleeve. The sleeve is dimensioned to surround an exposed face of the upper hood support when mounted to the firewall. The resilient sleeve provides a low friction barrier between the hood cowling and the upper hood support with the hood cowling in a closed position and supported by the upper hood support.

The present invention provides a sound-absorbing material having sound absorption performance with an average sound absorption coefficient of 0.70 or more in the frequency range of 800 to 5000 Hz. The present invention provides a sound-absorbing material including: a fiber layer including a plurality of holes open to a surface thereof and having a thickness of 3 mm or more; and an inorganic material layer mainly containing a calcium-based material and having a thickness of 0.4 to 0.6 mm on the surface of the fiber layer, the holes being blind holes each penetrating through the inorganic material layer and having a bottom inside the fiber layer, each hole having a depth corresponding to 50 to 90% of the thickness of the fiber layer.

A sound insulation material 1 includes a first layer 10 constituted by a polyurethane foam, a second layer 20 that is laminated on a surface of the first layer, the surface being located on a first side, and that is constituted by a sheet-shaped member made from a material other than polyurethane, and a third layer 30 that is laminated on a surface of the second layer, the surface being located on the first side, that is constituted by a polyurethane foam, and that, over its entirety, has a higher density than the density of at least a portion of the first layer.