Abstract: The present invention provides an engine cover structure for an engine (1) whose cylinder head (7) is covered at three of front, rear, right and left sides thereof by a fuel tank (10), an air cleaner (20) and a muffler (9), respectively, comprising a cover (50) which covers the remaining one side and/or a top side of the cylinder head (7).

Abstract: In a device for establishing noise in a motor vehicle, including a housing having an inlet space, which is in communication via an inlet line with a gas-carrying part of an internal combustion engine arranged in the motor vehicle, and an outlet space, which is acoustically coupled by means of an outlet line to an interior space of the vehicle or the space surrounding the vehicle, the inlet space is separated from the outlet space at least by an acoustically substantially inactive wall. Arranged inside the housing is a sound transmission device, which has vibratable elements, one arranged in the inlet space and onother arranged in the outlet space and connected to each other by a curved connecting element, which is mounted on the acoustically inactive wall, for the transmission of sounds introduced through the inlet line into the inlet space to the outlet space.

Abstract: A sound insulation system for use with a vehicle includes a layer of fibrous padding material having a first surface and an opposite second surface. The first surface includes multiple spaced apart recesses. The second surface includes a substantially flat surface portion that extends over two adjacent recesses. The multiple recesses are configured to define multiple voids when the sound insulation system is mounted in the vehicle, thereby enhancing acoustical performance of the sound insulation system.

Abstract: A construction machine includes an engine guard, an engine, a cooling fan, and a device for being cooled by the cooling fan, and an exhaust duct. The engine guard accommodates the engine and has intake and exhaust openings. The intake opening and the exhaust opening are disposed in different side covers. The side covers correspond to the left and right side walls of the engine guard. The engine, the cooling fan, and the device are accommodated in the engine guard. The exhaust duct is disposed above and behind the engine, parallel with the flow of a fan air which has been used for cooling the engine, and substantially horizontally. The exhaust duct has an exit connected to the exhaust opening. The fan air introduced from the intake opening flows substantially linearly along the cooling fan, the engine, and the exhaust duct and is discharged from the exhaust opening.

Abstract: An air intake apparatus has an air intake port opening outside, and an air intake path communicating the air intake port with a combustion chamber of an engine. For suppressing noise getting out from the air intake port, with respect to walls partitioning the air intake path, an opening is provided at a part of said walls corresponding to an antinode region of resonance mode of standing wave in a full length of the intake path, or at a part of noise pressure level being high in the intake path. The opening is closed with a permeable member and a noise insulating wall is disposed outside the permeable member for suppressing emission of transmitting noise passing through the permeable member. member. Alternatively, a vibration control member for suppressing face-vibration of the permeable member and reducing radiant noise from the permeable member is provided instead of the noise insulating wall.

Abstract: An air intake apparatus includes an air intake duct provided with an inlet through which intake air should be introduced, an air cleaner disposed on the downstream side of the air intake duct and for filtering the intake air, and an air cleaner hose disposed on the downstream side of the air cleaner and for supplying the filtered intake air to a combustion chamber of an engine, wherein an intake air passageway is laid out between the inlet and the combustion chamber. In a passageway wall surrounding an antinode of a lower resonance mode corresponding to the whole passageway length of the intake air passageway, a valve for opening a communicating path allowing the inside of the intake air passageway to communicate with the outside thereof at least when the lower resonance mode occurs, and an air-permeable member disposed to block the communicating path are disposed.

Abstract: An insulator dash (20) installed on the interior side surface side of a dash panel (10), comprising a single sound absorbing layer (21) formed of a fiber assembly or a laminated assembly having light and soft skin layers (22,23,26,27,28) laminated on the surface of sound absorbing layer (21), wherein, since the reflected noise reflected from the inner surface of an instrument panel (40) is taken again from the front surface side into the sound absorbing layer (21) for sound absorption in addition to the sound absorbing and shielding performance of the insulator dash (20), the sound absorbing performance in the instrument panel (40) can be increased, whereby the weight can be reduced and a rise of sound pressure in the instrument panel (40) can be abolishing a conventional sound shielding layer so as to increase a silentness in a cabin.

Abstract: Sound attenuating laminates, and methods of making the same, are provided. Heat is applied to a surface of a non-woven, fibrous layer of material to form a stratum of melted fibers having a density greater than that of the remainder of the fibrous layer. The density of the melted fibers is effective in attenuating noise traversing the fibrous layer of material. Upholstery material, such as carpeting, is attached to the surface of the heated fibrous layer. The fibrous layer and upholstery material are then subjected to compressive molding pressure to obtain a desired shape. The compressive molding pressure may further tune the sound attenuating properties of the fibrous layer by selectively changing the densities of portions of the fibrous layer.

Abstract: A sound insulation system for use with a vehicle includes a layer of fibrous padding material having a first surface and an opposite second surface. The first surface includes multiple spaced apart recesses. The second surface includes a substantially flat surface portion that extends over two adjacent recesses. The multiple recesses are configured to define multiple voids when the sound insulation system is mounted in the vehicle, thereby enhancing acoustical performance of the sound insulation system.

Abstract: A sound insulation in tubular parts regardless of the section shape of the part, uses a piece of material that is suitable for expanding over the entire section of the section, which piece is mounted using a support suitable for fixing to the wall of the tube that is to be insulated. In a particular embodiment, a sound insulation assembly mounted in a part presenting a longitudinal direction and a tubular wall comprises a wafer that is thermally expandable to form a foam, said wafer having two parallel main faces and extending essentially along a main plane from a first wall portion towards the diametrically opposite wall portion, together with a wafer support comprising a clamp for retaining the wafer prior to expansion and coupled to fixing means in the form of a clip for fixing to the first wall portion of the part.

Abstract: The present invention concerns an automotive protective mat (1), also known as throw in mat or protective mat. This mat comprises a microporous stiffening layer (2) (acoustical membrane). This layer may be composed of several sheets. The overall air flow resistance is between 500 Ns/m3–4000 Ns/m3. It is essential for this mat (1) that it is hydrophobic. In order to achieve an enhanced acoustical effectiveness a decoupling layer (6) is foreseen between the microporous stiffening layer (2) and the vehicle floor (8). This decoupling layer might be incorporated in the mat (1) or constituted by the underlaying carpet or sound absorber of the vehicle floor. Further layers or sheets such as adhesive layers, non skid layers, face fabrics or carpets and/or loft layers can be added to the claimed mat.

Abstract: An exciting sound wave generator is positioned within a nacelle of a jet engine at its inlet to generate an exciting sound wave having a primary frequency generally different from a frequency of the primary tone of the noise. The exciting sound wave is used to modulate the primary tone of the noise and, therefore, distribute sound energy of the noise from the primary tone to a broad range of side bands so that the amplitude of the primary tone of the noise is reduced.

Abstract: Vehicle trim components are formed by applying a layer of material onto a mold surface and then selectively applying foam prior to molding operations. Selectively applying foam may include applying foam of different densities in multiple locations and/or applying foam of different thicknesses in multiple locations. The material and foam are subjected to conditions within the mold to produce a trim component having a desired shape. Once de-molded, barrier material may be added and various post-molding operations may be conducted.

Abstract: A sound absorber (A), especially for motor vehicles, comprising a layer (4) of absorption material, such as open-pored or optionally closed pored foamed material or a wood fiber composite, and a top layer (5) . The aim of the invention is to produce an absorber in such a way that said absorber is easy to produce and assemble and functions well. According to the invention, the top layer (5) for leading through a loom of cables (8) or the like is provided with a tubular recess (40) for leading through a loom of cables. Said recess (4) is provided with groove-like undercuts (42) on the outside.

Abstract: A lid adapted to be mounted on the cylinder head of an internal combustion engine by attachment screws includes a cap and a carrier element adapted to be attached to the cylinder head by the attachment screws. To achieve an improved sound decoupling, the cap and the carrier element are connected to an elastomer component, with the connection between the cap and the carrier element being, at least in part, exclusively constructed by the elastomer component, and with a space being provided between the cap and the carrier element. The carrier element possesses a substantially straight section arranged to extending preferably at a right angle to the attachment surface of the cylinder head, the substantially straight section of the carrier element, a portion of the elastomer component adjacent the cap, and a portion of the cap adjacent the carrier element extend in a straight line.

Abstract: Sound insulation for an engine contained within an outer casing, the insulation made up from a minimal number of interlocking molded foam insulation pieces forming a substantially continuous shroud surrounding the operating parts of the engine and having an outer surface matching the inner shape of the outer casing and in contact therewith. Preferably the outer casing is used to generate the molds used to manufacture the molded sound insulation pieces, thereby providing a good surface fit between the outer insulation surface and the inner casing surface.

Abstract: A device for the targeted sound transmission from an intake tract of an internal combustion engine to the interior of a motor vehicle. The device comprises at least one hollow transmission conduit, which communicates on the input side with the intake tract and to which at least one resonator chamber, which emits the sound to the motor vehicle interior, is connected. In order to achieve improved modulation of the sound that is emmitted to the motor vehicle interior, the inventive device has several resonator chambers operating in parallel, at least two of which differ from one another with respect to the tuning of their frequencies.

Abstract: The invention relates to a multilayered acoustic and thermal insulation part (1), in particular for motor vehicles, with at least one three-dimensionally structured foamed-plastic layer (2) and at least one nonwoven-fabric layer (3) lying adjacent thereto, whereby the foamed-plastic layer has a plurality of protrusions (4) and/or depressions (5). In order to be able to produce such an insulation part cost-effectively with a low weight, provision is made such that the nonwoven-fabric layer (3) is needled onto the foamed-plastic layer (2), and in such a way that the nonwoven-fabric layer lies contour-parallel next to the foamed-plastic layer and the protrusions (4) and/or depressions (5) of the foamed-plastic layer (2) are also impressed in the surface of the nonwoven-fabric layer (3) facing away therefrom.

Abstract: A shape memory foam member is disclosed. A coefficient of water absorption of the shape memory foam member is in the range between 0.01 g/cm3 and 0.2 g/cm3 in a non-compressed state. The shape memory foam member is compressed with heating; cooled with keeping the shape memory foam member in the compressed state; and released from the compressive pressure on the shape memory foam member after cooling. The original shape of the shape memory foam member is substantially recovered by heating.

Abstract: Vehicle trim components are formed by applying a layer of material onto a mold surface and then selectively applying foam prior to molding operations. Selectively applying foam may include applying foam of different densities in multiple locations and/or applying foam of different thicknesses in multiple locations. The material and foam are subjected to conditions within the mold to produce a trim component having a desired shape. Once de-molded, barrier material may be added and various post-molding operations may be conducted.

Abstract: An acoustic barrier systems that reduces the amount of noise entering the passenger compartment of a vehicle includes a secondary acoustic attenuator that extends from a primary acoustic barrier to a vehicle component case to envelop space around a conduit passing from the engine compartment to the component case. In one embodiment, the secondary acoustic attenuator extends from the primary acoustic barrier to the component case, with the secondary acoustic attenuator enveloping space around the conduit between the vehicle component case and the primary acoustic barrier.

Abstract: An engine cover has a cover body having a through hole penetrating both sides of the cover body in an area opposed to a resonant space in which resonant sounds are generated. An opening of the through hole is covered with the sound absorbing member layer. Because a part of the resonant space is open, resonant sounds generated in the resonance space are decreased.

Abstract: An engine cover mounted to an internal combustion engine of an automobile etc. includes a rigid cover body made of a resin or metal and covering an engine, a foamed member fixed to an inner face of the cover body and including at least a part spaced from the engine, and a plurality of corrugations formed on the part of the foamed member spaced from the engine.

Abstract: An acoustical barrier comprises a layer of molded firm-flexible foam that is generally configured to match the acoustical requirements in an environment and mounted against a sound-transmitting substrate and can have one or more areas of patterned recesses along a substrate-facing side or varying thickness tailored to the intensity of sound transmitted through the sound-transmitting substrate with or without a thin, impervious barrier layer overlying the foam layer.

Abstract: An acoustic barrier systems that reduces the amount of noise entering the passenger compartment of a vehicle includes a secondary acoustic attenuator that extends from a primary acoustic barrier to a vehicle component case to envelop space around a conduit passing from the engine compartment to the component case. In one embodiment, the secondary acoustic attenuator extends from the primary acoustic barrier to the component case, with the secondary acoustic attenuator enveloping space around the conduit between the vehicle component case and the primary acoustic barrier.

Abstract: An air intake apparatus has an air intake port opening outside, and an air intake path communicating the air intake port with a combustion chamber of an engine. For suppressing noise getting out from the air intake port, with respect to walls partitioning the air intake path, an opening is provided at a part of said walls corresponding to an antinode region of resonance mode of standing wave in a full length of the intake path, or at a part of noise pressure level being high in the intake path. The opening is closed with a permeable member and a noise insulating wall is disposed outside the permeable member for suppressing emission of transmitting noise passing through the permeable member. member. Alternatively, a vibration control member for suppressing face-vibration of the permeable member and reducing radiant noise from the permeable member is provided instead of the noise insulating wall.

Abstract: An insulator dash (20) installed on the interior side surface side of a dash panel (10), comprising a single sound absorbing layer (21) formed of a fiber assembly or a laminated assembly having light and soft skin layers (22,23,26,27,28) laminated on the surface of sound absorbing layer (21), wherein, since the reflected noise reflected from the inner surface of an instrument panel (40) is taken again from the front surface side into the sound absorbing layer (21) for sound absorption in addition to the sound absorbing and shielding performance of the insulator dash (20), the sound absorbing performance in the instrument panel (40) can be increased, whereby the weight can be reduced and a rise of sound pressure in the instrument panel (40) can be abolishing a conventional sound shielding layer so as to increase a silentness in a cabin.

Abstract: A casing cover (1, 10, 22) for an internal-combustion engine, particularly valve covers or oil pans, to be mounted detachably and fluid-tight to an engine block (5, 13, 23), having an elastomer seal profile (3, 12, 28) disposed at the peripheral edge (2, 11) of the casing cover (1, 10, 22), and an inside (6, 17), axial extension (7, 14, 26) oriented in the direction of the engine block (5, 13, 23) disposed at the edge (2, 11) of the casing cover (1, 10, 22). The extension projects axially beyond the sealing surface (4, 15) of the engine block when the cover is installed, and a seal (20, 29) is disposed at least between the axial extension (7, 14, 26) and the engine block (5, 13, 23).

Abstract: An engine noise reduction device to reduce sound output from an engine compartment and supply cooling air to the engine compartment to increase cooling efficiency and prevent engine and component overheating. The device opposes a plurality of air inlets, to receive an air flow therefrom, and includes a split-type noise absorbing portion and a cell-type noise absorbing portion.

Abstract: An engine cover mounted to an internal combustion engine of an automobile etc. includes a rigid cover body made of a resin or metal and covering an engine, a foamed member fixed to an inner face of the cover body and including at least a part spaced from the engine, and a plurality of corrugations formed on the part of the foamed member spaced from the engine.

Abstract: An acoustic shielding article which includes a shaped thermoplastic element that has a metal inlay element fixedly attached thereto, is described. More particularly, the acoustic shielding article (1) includes: (a) a shaped thermoplastic element (3) having a surface (11) that faces a source of sound (14); and (b) a metal inlay element (2) having substantially opposed first (17) and second (20) surfaces, at least one of which is fixedly joined to the shaped thermoplastic element. The shaped thermoplastic element is formed by means of molding thermoplastic material onto at least one of the first and second surfaces of the metal inlay element, thereby fixedly joining the metal inlay element to the shaped thermoplastic element.

Abstract: The mower includes a frame which is supported for movement upon a plurality of ground engaging wheels and upon which are supported a motor generator set, an internal combustion motor and a plurality of reel lawn mowers. The motor generator set provides electrical energy for electric motors that drive the reel type lawn mowers. A housing encloses the internal combustion motor and motor generator set and utilizes a combination of passive noise abatement and active noise abatement to reduce noise generated within the interior of the housing. The passive noise abatement is provided at plurality of locations around the motor generator set within the housing.

Abstract: Sound attenuating composite articles for use within vehicles as floor coverings and other interior trim components are provided. A sound attenuating composite article includes a damping layer, decoupler layer, scrim/web layer, and a porous upholstery material sandwiched together. The damping layer has a thickness of less than about 5 mm and is configured to be attached to a surface of a panel of a vehicle (e.g., a sheet metal or polymeric component of a vehicle, such as a floor panel, door panel, etc.) in face-to-face contacting relationship therewith. The decoupler layer has a thickness of less than about 70 mm and is attached to a surface of the damping layer in face-to-face contacting relationship. The scrim/web layer has a thickness of less than or equal to about two millimeters (2 mm). The porous upholstery material (e.g., carpeting) is attached to a surface of the scrim/web layer of material in face-to-face contacting relationship therewith.

Abstract: A soundproof cover includes a sealing layer, a sound insulation layer, and a vibration inhibition layer. The sound insulation layer has a peripheral portion, is to be disposed so as to contact at least the peripheral portion with a noise source, and exhibits elasticity. The sound insulation layer is formed as a hard plate shape, has an installation portion to be fastened to the noise source, and is disposed so as to cover the sealing layer. The vibration inhibition layer is disposed on at least a part of an interface between the sealing layer and the sound insulation layer so as to adhere to the sound insulation layer, and inhibits the sound insulation layer from vibrating.

Abstract: An orifice muffler is designed to minimize the sound pressure level of noise emanating from control orifices in the positive crankcase ventilation (PCV) system of an automotive vehicle engine. The muffler is formed as an elongated tube having imperforate sidewalls and inlet and outlet end walls. The outlet end wall has a single orifice sized to provide a control exhaust gas flow thorough the muffler while the inlet end wall has at least two orifices of differing sizes. The inlet orifices are operative to pass the controlled gas flow and to create destructive wave interference between the flow streams thorough the muffler to minimize noise caused by turbulent flow. Various optional features of the muffler construction are also disclosed.

Abstract: The invention relates to a sound absorber (A), especially for motor vehicles, comprising a layer (4) of absorption material, such as open-pored or optionally closed-pored foamed material or a wood fibre composite, and a top layer (5). The aim of the invention is to produce an absorber in such a way that said absorber is easy to produce and assemble and functions well. According to the invention, the top layer (5) for leading through a loom of cables (8) or the like is provided with a tubular recess (40) for leading through a loom of cables. Said recess (40) is provided with groove-like undercuts (42) on the outside.

Abstract: The invention relates to a damping film for a floor panel (1) of a motor vehicle. The inventive damping film (4) is provided partially, that is in hole areas (6) or in predetermined oscillation areas (6a) with a reinforcing layer (5).

Abstract: 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 mm2 or more, and the total of the opening area accounts for 1 to 70% with respect to the area of a film formation surface on the porous member. A soundproof cover including the sound absorbing structure disposed on the inner surface of a cover main body are also provided.

Abstract: A noise insulation structure of a synthetic resin made conduit includes a synthetic resin made chamber and a rubber made noise insulation member. Since the chamber is closely covered around with the noise insulation member through projections and grooves formed on the contact surface of the chamber with the noise insulation member. Further, cylindrical blind-end bores are provided on the inner surface of the noise insulation member so as to form air columns when the noise insulation member is installed on the chamber. The air columns serve as resonators to muffle noise.

Abstract: An acoustic shielding article which includes a shaped thermoplastic element that has a metal inlay element fixedly attached thereto, is described. More particularly, the acoustic shielding article (1) includes: (a) a shaped thermoplastic element (3) having a surface (11) that faces a source of sound (14); and (b) a metal inlay element (2) having substantially opposed first (17) and second (20) surfaces, at least one of which is fixedly joined to the shaped thermoplastic element. The shaped thermoplastic element is formed by means of molding thermoplastic material onto at least one of the first and second surfaces of the metal inlay element, thereby fixedly joining the metal inlay element to the shaped thermoplastic element.

Abstract: An improved heat shield offers both a thermal insulation and reduced noise transmission for vehicular engine components, including exhaust manifolds, for example. The structure has three layers: an outer structural metal layer, a center insulation layer to isolate heat and dampen noise, and an inner metal layer directly adjacent the shielded component for reflecting heat back to the shielded component. As disclosed, the heat shield includes at least one bolt aperture for attachment of the shield to a shielded component, such as an exhaust manifold in the described embodiment. The aperture is circumferentially bordered by at least one non-planar undulation defining a protuberance. The protuberance is spaced circumferentially about the aperture. As the bolted connection of the heat shield to the manifold is a major source of vibration transmittal from the manifold into the shield, the protuberance is effective to dampen the vibration, and hence noise associated with the vibration.

Abstract: A noise reduction structure for a cab of a working vehicle, by which a high degree of noise reduction effectiveness can be surely obtained, is provided. For this purpose, the noise reduction structure has a configuration in which a sound-insulating chamber (A; B; C) adjacent to a cab (10a) is provided at a position of at least one of the following: under a floor (11a) of the cab (10a), behind a rear wall of the cab (10a), and at a side of a side wall of the cab (10a).

Abstract: A noise-reducing engine enclosure for an engine includes first and second members removably mounted to one another in cooperating relation to define an engine receiving space therebetween. The first and second members each include a noise-reducing layer of material to reduce noise transmission to the atmosphere outside of the engine enclosure during operation. The first and second members are movable between (1) an engine accessing position, wherein the first and second members are positioned to allow access to the engine during operation and (2) an engine enclosing position, wherein the first and second members cooperate to define the engine receiving space to receive and enclose the engine therein such that noise transmission to the atmosphere during operation is reduced.

Abstract: Apparatus for reducing noise emitted from an appliance having a cabinet that supports at least one component that emits at least one acoustic pressure wave therefrom. In a preferred form, the apparatus comprises at least one diffuser having at least one deflection surface. The diffuser is coupled to the cabinet and positioned relative to the one component such that the acoustic pressure wave emitted from the component is deflected by the one deflection surface in a predetermined direction. The diffuser can be used to deflect acoustic pressure waves such that they collide with each other. The apparatus may further include at least one absorber. The diffuser is strategically located to deflect acoustic pressure waves being emitted from the component into the absorber to reduce the noise emitted from the appliance.

Abstract: A soundproof cover includes a sealing layer, a sound insulation layer, and a vibration inhibition layer. The sound insulation layer has a peripheral portion, is to be disposed so as to contact at least the peripheral portion with a noise source, and exhibits elasticity. The sound insulation layer is formed as a hard plate shape, has an installation portion to be fastened to the noise source, and is disposed so as to cover the sealing layer. The vibration inhibition layer is disposed on at least a part of an interface between the sealing layer and the sound insulation layer so as to adhere to the sound insulation layer, and inhibits the sound insulation layer from vibrating.

Abstract: The soundproof casing is divided to an engine room (1), a muffler room (2) and a radiator room (3). The engine room (1) includes the engine E and a work machine unit (generator unit G). The muffler room (2) includes mufflers M1, M2. The radiator room includes a radiator R. An electric fan D is provided between an air intake aperture (22a) and the radiator. The radiator room and the muffler room are communicated. An air flow duct (4) to communicate the engine room and the muffler room is provided. An engine fan F is provided just opposite to an entrance of the air flow duct. An inter-cooler I is provided in the air flow duct. The soundproof type engine driven work machine including aforementioned apparatuses is offered to improve the cooling efficiency as well as reducing unfavorable noise.

Abstract: An injector is stored in a fixing block integrally formed with an intake manifold. A soundproof cover covers the entire electric supply terminal projecting from the injector in a lateral direction and the coupler connected to the plug. In addition, the soundproof cover brought into close contact with a fuel distribution pipe covering over top portions of a plurality of injectors to supply fuel and with the intake manifold to prevent operating sound from leaking out. Further, a hard material cover for covering the fixing block of the intake manifold, the soundproof cover and the fuel distribution pipe so as to improve its aesthetic appearance as well as its soundproof effect is also provided. This arrangement results in shutting off operating sound from an injector of an engine having a cylinder head projecting in a transverse direction of a vehicle body.

Abstract: A lid adapted to be mounted on the cylinder head of an internal combustion engine by attachment screws includes a cap and a carrier element adapted to be attached to the cylinder head by the attachment screws. To achieve an improved sound decoupling, the cap and the carrier element are connected to an elastomer component, with the connection between the cap and the carrier element being, at least in part, exclusively constructed by the elastomer component, and with a space being provided between the cap and the carrier element. The carrier element possesses a substantially straight section arranged to extending preferably at a right angle to the attachment surface of the cylinder head, the substantially straight section of the carrier element, a portion of the elastomer component adjacent the cap, and a portion of the cap adjacent the carrier element extend in a straight line.

Abstract: The mower includes a frame which is supported for movement upon a plurality of ground engaging wheels and upon which are supported a motor generator set, an internal combustion motor and a plurality of reel lawn mowers. The motor generator set provides electrical energy for electric motors that drive the reel type lawn mowers. A housing encloses the internal combustion motor and motor generator set and utilizes a combination of passive noise abatement and active noise abatement to reduce noise generated within the interior of the housing. The passive noise abatement includes multiple sound abating linings, and the active noise abatement is provided at plurality of locations around the motor generator set within the housing.

Abstract: A soundproof cover to be mounted on the engine of an automobile is provided. The soundproof cover includes a foam material having a mixed cell structure of open cells and closed cells and a water absorption coefficient of 0.01 g/cm3 or more and less than 0.5 g/cm3. The foam material is provided along the circumferential rim of a cover main body surface facing an engine, and projects to the engine side by a predetermined height such that the foam material closes the gap with respect to the engine at the time it is mounted on the engine.