A motor oil pump assembly includes: an inner sound insulation enclosure encloses an oil pump component, and the inner sound insulation enclosure and the oil pump component define an inner sound insulation cavity filled with low-pressure oil, the inner sound insulation cavity is in communication with a low-pressure cavity of the oil pump component, and the inner sound insulation enclosure is provided with a sound insulation enclosure cavity; and a pre-tightening buffering component, where the pre-tightening buffering component includes a piston and an elastic member, the piston fits in with the sound insulation enclosure cavity, the piston and an upper end cover of the oil pump component are integrally formed, and the elastic member is elastically sandwiched between a top wall of the sound insulation enclosure cavity and the piston, where the sound insulation enclosure cavity is in communication with a high-pressure cavity of the oil pump component.

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.

Provided is a vehicle wheel with a sub-air chamber member as a Helmholtz resonator attached to a rim. The sub-air chamber member includes a main body having a sub-air chamber therein, a tubular body providing communication between the sub-air chamber and a tire air chamber, and a cover member covering the main body. The main body is disposed on a rim inner circumferential surface portion of the rim present on an inner side of the rim in a wheel radial direction and extending in a wheel width direction. The tubular body is disposed in a through-hole provided in the rim so as to provide communication between the inner side of the rim in the wheel radial direction and the tire air chamber side. The cover member covers the main body from an inner side in the wheel radial direction.

A vehicle wheel includes: a rim including a well portion with an outer circumferential surface, the well portion having a recessed portion formed on the outer circumferential surface; a sub-air chamber member serving as a Helmholtz resonator; and a joining member including a joining portion disposed in the recessed portion. The sub-air chamber member is attached to the outer circumferential surface of the well portion via the joining member.

The disclosed technology includes an automobile interior with enhanced acoustics and thermal resistance. In one embodiment, the automobile interior includes a sound-absorbing material coupled to an interior automobile surface adjacent to an automobile speaker. The sound-absorbing material includes an absorptive surface and a backing. The absorptive surface faces towards the automobile speaker to absorb sound waves emitted from a rear side of the automobile speaker and the backing blocks the sound waves from escaping a speaker compartment into a main cabin of the automobile, thereby mitigating echo and back wave frequency cancellation in the automobile interior. In some embodiments, the acoustically enhanced automobile interior may further include a second acoustical material coupled to the interior automobile surface and positioned between the sound-absorbing material and the interior automobile surface.

A vehicle wheel includes: a pair of vertical walls that are provided upright on an outer circumferential surface of a well portion and extend in a circumferential direction; and a sub air chamber member that is provided between the pair of vertical walls to be held by frictional force generated between the sub air chamber member and the pair of vertical walls and includes an extending wall portion.

A high heat polymer with improved sound deadening properties is provided. The material includes recycled PET (Polyethylene terephthalate) as its base polymer and combination of mineral fillers and fibers to improve heat deflection temperatures and to create a barrier within the polymer that blocks noise. The material uses use a combination of basalt fibers and mica to provide improved resistance to heat and improved elastic modulus and significant dampening of sound. The high heat performance and improved sound attenuation of the material enables the deletion of heat shields and added NVH pads to many under body and under-hood parts, as well as significantly reducing the material cost and weight in automobiles.

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.

A soundproof cover is mounted to a first gear box of a power seat motor unit that is attached to a frame member of a seat and that has a motor and a gear box. In the first gear box, the axial direction of the motor is defined as the X direction, the direction of attachment to the frame member, which is one of two directions that are orthogonal to the X direction, is defined as the Y direction, and the remaining direction is defined as the Z direction. Then, the soundproof cover has: a foam disposed on at least an X-Z surface of the first gear box; a cover member disposed on the outer side of the foam; and a mass body interposed between the foam and the cover member and disposed at a position corresponding to at least the X-Z surface of the first gear box in contact with the foam.

A tiered, wedge-shaped insert for reducing noise and/or vibration caused by a first surface contacting a second surface, the insert having at least one upper body portion forming a top surface of the insert, one or more middle body portions, each body portion have a pair of ledges that extend along opposed front and rear surfaces of the insert, and a wedge-shaped tip, wherein the middle body portions are disposed between the upper portion and the tip. A generally wedge-shaped insert having a top surface, a wedge-shaped bottom portion, opposed front and back surfaces, and two opposed side surfaces.