Provided is a box-shaped soundproof structure that is small and light and can sufficiently reduce noise with a natural frequency of a sound source. A box at least a part of which is opened; and a sound reduction structure including a resonator disposed in the box are included, and a sound generated from a sound source disposed in contact with an outer surface of a wall of the box or in the box and emitted from an open surface of the box to the outside is reduced by the sound reduction structure.

A soundproofing device according to the present disclosure includes a Helmholtz resonator including: a wall that forms a Helmholtz resonance chamber; and a first opening formed in the wall so as to cause the Helmholtz resonance chamber to communicate with an outside of the Helmholtz resonance chamber. At least a part of the wall is configured by a sound source member that radiates sound. The Helmholtz resonator includes: one or more partition walls formed so as to divide the Helmholtz resonance chamber into a plurality of regions, and a second opening formed in the one or more partition walls so as to cause the plurality of regions to communicate with each other.

According to the present invention, a panel-shaped first metal body (2) comprises a space-forming part (2a) and an overlap part (2b) that is continuous with the space-forming part (2a). A panel-shaped second metal body (4) comprises a space-forming part (4a) and an overlap part (4b) that is continuous with space-forming part (4a). When the first metal body (2) and the second metal body (4) have been assembled, a housing space layer (S1) that is for housing a sheet-shaped glass wool material 3 is formed between the space-forming parts (2a, 4a), and the overlap parts (2b, 4b) overlap. A solid joining part (W1) that connects the overlap parts (2b, 4b) is formed between the overlap parts (2b, 4b).

A vibration reduction device having an acoustic meta structure mounted to a vehicle body and configured to block a structure-borne noise transmitted through the vehicle body may include a plurality of unit structures arranged at a predetermined interval therebetween, wherein each of the unit structures includes frame mounted to the vehicle body and configured to separate a predetermined space into a predetermined number of separate sections formed by walls of the frame; and a vibrator formed at a corner portion of each of the separate sections and each of which has a natural frequency to block a vibration transmitted from the vehicle body through the frame.

A housing of a wire harness includes a first member and a second member that store therein an object to be stored; a locking mechanism that locks the first member and the second member, when a first locking surface and a second locking surface are locked to each other in a first direction; and a stabilizer mechanism that includes a fitting surface projecting from the first member to outside, and a biasing part that projects from the second member to the outside, that is elastically and deformably provided along the first direction, that is elastically deformed by coming into contact with the fitting surface while the first member and the second member are locked by the locking mechanism, and that generates biasing force for pressing the second locking surface toward the first locking surface side along the first direction.

A utility vehicle powertrain enclosure includes an engine and a transmission mounted to a carrier under a utility vehicle cargo box and substantially enclosed by the carrier and a plurality of panels. The carrier has a forward end pivotably attached to a frame member of the utility vehicle, and sides flexibly connected to panels alongside the engine, and a rearward end mounted to the utility vehicle with a pair of suspension members.

A sound-absorbing material obtained by stacking nonwoven fabrics that has a structure for both maintaining its sound-absorbing performance and providing flame-retardancy. The sound-absorbing material is obtained by stacking a base material made of nonwoven fabric and a surface material made of nonwoven fabric, in which a flame-retardant material made of nonwoven fabric having a density that is higher than those of the base material and the surface material is disposed between the base material and the surface material. Also, a wire harness is provided with the sound-absorbing material in which the wire harness and the sound-absorbing material are integrated with each other by covering at least a portion of the wire harness extending in an axial direction, with the sound-absorbing material.

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 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.

A cover for a seatbelt retractor assembly comprising: a first layer having an inside surface configured to face a seatbelt webbing retracted by a seatbelt retractor assembly, an outside surface configured to face away from the seatbelt webbing, a plurality of holes disposed through the first layer from the inside surface through to the outside surface, and baffles adjacent each of the plurality of holes. The cover reduces audible noise generated by moving components of the seatbelt retractor assembly. The baffles adjacent each of the plurality of holes are disposed on the inside surface. The cover can further include a second layer, which includes a sound absorbing material such as foam. The second layer at least partially covers the outside surface of the first layer and covers the plurality of holes. The cover can further include snap fit fastening elements to connect the cover to the seatbelt retractor assembly.