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WO/1987/007974A1 |
In propeller of fan driven aircraft, cabin noise levels may be reduced by adjustment of the phase relationship between a reference propeller or fan and some or all of the other propellers or fans. An aircraft cabin (1) contains four micr...
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WO/1987/005357A1 |
Exhaust system for combustion engines, which comprises of a longitudinally extending tubular member (1), in direction from a first end portion having a number of smooth portions (2, 2') alternating arranged with corrugated portions (3, 3...
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WO/1987/004641A1 |
Process for purifying exhaust air discharged from production facilities, combustion plants or internal combustion engines, in which sound and ultrasound are superimposed on the exhaust air with at least two different basic frequencies. T...
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WO/1987/003948A1 |
A device for reducing duct-carried air-borne sound comprises a casing (1) enclosing a duct and a certain volume of sound absorbing material (2) attached in said casing in such a manner, that at least partially a free longitudinal passage...
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WO/1987/000241A1 |
Silencer comprising a closed container comprising a side wall (3) having an elliptical shape, a top, a bottom and an input (1) and an output (2). Exhaust gases from a combustion engine are brought into the interior of the container at a ...
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WO/1986/004954A1 |
A sound-absorptive or sound-moderating exhaust-gas conduit connects between the exhaust manifold of a forwardly mounted internal combustion engine of an automobile and a location at the rear of the vehicle. The exhaust conduit has a subs...
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WO/1986/004668A1 |
A sound attenuation box (1) has in its preferred embodiment a plurality of cavities (2) each covered by one outer vibrating plate (3) and each containing an inner plate (4) pierced with one hole (7) and forming with the cavity (2) a Helm...
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WO/1985/005404A1 |
A sound absorption system is formed in such a way that at least a part of the system is provided with a muff of pressed mineral wool. It thus becomes possible to suppress, for example, exhaust noise, particularly from internal combustion...
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WO/1985/004688A1 |
These noise silencing systems are applied to the silencing of noise developed in fluids, that is either in a gas as exemplified by a jet engine exhaust or in a liquid such as in a hydraulic power transmission system. The configuration of...
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WO/1985/004217A1 |
The heat exchanger of the purifier which draws heat from exhaust gases during the reaction sustained by the catalytic device comprises at least two parts. The first part (4) of the heat exchanger is intended to bring the temperature of t...
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WO/1985/001985A1 |
A compact, sound-attenuating muffler for a high-performance internal combustion engine in which the muffler casing (21) has an elongated transverse cross-section with a height dimension of only slightly larger than the height dimension o...
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WO/1985/000853A1 |
A basic new method and devices for treating flowing substances such as subdivided solids, colloids, gels, liquids and gases, under varying temperature, pressure and velocity conditions. The method is characterized by forming three concen...
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WO/1984/004781A1 |
Low pressure pulses are generated intermittently in the exhaust gases in the exhaust-silencer system of the engine, to produce a standing wave of alternating high and low pressure. This is achieved by means of a turbulence unit designed ...
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WO/1984/003123A1 |
Exhaust device wherein the exhaust gas from the engine are not directly exhausted to the ambiant air. The free end of the exhaust pipe is closed and openings are arranged in the envelope of the pipe in the area of the free end. The openi...
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WO/1984/002954A1 |
A heat and sound insulating apparatus comprises a heat and sound insulating member constituted by a laminated structure formed by mixing ceramic fibers into long glass fibers. The inner surface of the member is completely exposed in an e...
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WO/1983/002302A1 |
Method and device for reducing the noise, particularly at a high frequency, of combustion engines. To this effect, elements (18) are directly inserted after the sits (12) of exhaust valves. The exhaust noise may be decreased by 15 dB and...
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WO/1983/001653A1 |
Exhaust silencer for an internal combustion engine of absorption type which employs a cylindrical, porous sound absorber (1). A thin cylindrical membrane (5) made of a thin metallic film or the like is formed over the inner surface of th...
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WO/1983/000580A1 |
A low frequency attenuation method based on the virtual earth system has the driver (2) feeding cancelling waveforms into a partially closed volume (4) which contains the microphone (1) of the virtual earth feed-back loop (1, 3, 2). The ...
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WO/1982/003423A1 |
There is proposed a compressed air-operated hand tool wherein an improved sound damping is achieved without increasing the overall size which would be prejudicial to the handling ability. Inside the casing of the tool there is provided a...
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WO/1982/000854A1 |
Lightweight muffler and method for muffling a noise component of a stream of gases. The muffler includes a chamber (26) in which gases are directed in side-by-side steams (36, 47) flowing in opposite directions (44, 46). The steams (36, ...
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WO1982000275A1 |
It is conventional practice to rigidly secure a hood assembly on an engine enclosure for a construction vehicle. The connection joints are thus subjected to undue bending stresses. This invention solves the above stress problem by attach...
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WO/1981/001306A1 |
A sound silencer (10) for insertion in a duct having a fluid medium flowing therethrough includes an outer housing (20) having an open entry end (24), an open exit end (25), a base portion (21), a roof portion (22), and a pair of opposed...
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WO/1981/000591A1 |
A silencer is used in combination with a combustion apparatus or a combustion engine, said silencer being in the form of a casing (19) filled with granulate such as sand (36), pellets or the like, the induction air or exhaust gases being...
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WO/1981/000638A1 |
A method of reducing the adaption time needed to adapt a synthetically generated secondary waveform so that it nulls a primary repetitive waveform (e.g. noise) from a source (1) of vibration, the secondary waveform generation (5) being s...
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WO/1980/002304A1 |
The present invention relates to the acoustical gas flow silencer field, e.g. heating, ventilating and air conditioning systems, engine intakes and exhausts, process blowers and compressors, etc. In the prior art, silencers were construc...
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WO/1980/001933A1 |
A fluidborne noise attenuator (14) comprises a dampening medium (27) which exhibits a bulk modulus (e.g., 50,000 psi to 180,000 psi) substantially greater than that of an inert gas, such as nitrogen and substantially less than that of a ...
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WO/1980/000861A1 |
The noise damping device for piston motors in aircrafts, which allows the simultaneous cooling of the exhaust gases, offers a square cross section and a variable configuration according to the direction of the exhaust. The exterior sheet...
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WO/1980/000167A1 |
An exhaust system distinguished by a low content of passing through impurities and a low sound level and being intended for a pulsating heat source, especially an internal combustion engine. The exhaust gases from the different cylinders...
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WO/1979/000286A1 |
The acoustical gas flow silencer field, e.g. heating, ventilating and air conditioning systems, engine intakes and exhausts, process blowers and compressors, etc. In the prior art, silencers were constructed using an absorbtive material,...
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JP7458561B1 |
The interior parts of the silencer are held inside a dummy shell that is separate from the shell of the silencer, and the interior is filled after the sound-absorbing material is filled into the section that will become the sound-absorbi...
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JP7457046B2 |
To suppress noise in a wider band frequency.An exhaust pipe includes an inner pipe, an outer pipe, an opening, a closing part and at least one blocking part. The outer pipe is disposed outside the inner pipe to form a double pipe, and fo...
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JP7456067B2 |
The present invention makes it possible to easily manufacture: an exhaust muffler device comprising a recessed section; and a saddle-riding vehicle provided with this exhaust muffler device. In the exhaust muffler device, a muffler bod...
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JP7453736B2 |
Provided is an exhaust structure 1 attached to an underfloor space of a vehicle 100, in which an exhaust muffler 2 and aerodynamic parts such as an under panel 3 and a diffuser 4 are formed from the same heat-resistant resin in an integr...
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JP2024038826A |
An object of the invention disclosed herein is to suppress the occurrence of pump-up when an abnormality occurs in an exhaust gas switching valve. [Solution] An internal combustion engine system includes an exhaust switching valve that i...
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JP7445395B2 |
A silencing device according to the present invention comprises: a gas supply source that supplies a gas that is different from an exhaust gas emitted by an internal combustion engine; a pipe that is connected to the gas supply source an...
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JP2024031914A |
The present invention provides an automobile with a hydrogen-powered internal combustion engine that enables high performance (particularly in sport driving on a circuit) without imposing penalties. Two front wheels 2, two rear drive whe...
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JP7439657B2 |
This silencer is provided in a duct (2) in which a passage (3) having an opening on both sides or one side is formed. The silencer is provided with: a case (4) forming a space (6) which communicates with the passage (3) in the duct (2); ...
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JP7436439B2 |
A valve device includes a valve seat, a valve body, a buffer, and a non-overlapping portion. The valve seat has an opening that communicates with an exhaust flow path. The valve body is configured to open and close at least a part of the...
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JP2024016978A |
An object of the present invention is to provide an exhaust control device that can reliably open an exhaust switching valve at the time of starting an engine and can avoid a driver's discomfort caused by the driving sound of a motor of ...
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JP2024017548A |
An object of the present invention is to suppress propagation of a collision load to equipment installed in front of the vehicle in the event of a rear collision of the vehicle to a greater extent than before. A muffler for a vehicle inc...
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JP2024504281A |
A broadband silencer for a fuel cell vehicle includes a first shell (100), a second shell (200), and an internal tube (300). The first shell (100) and the second shell (200) are connected to form a sealed cavity. An endotube (300) is pla...
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JP7422402B2 |
To provide a thermoacoustic noise eliminator capable of generating high noise elimination effect although preventing pressure loss generated by a noise elimination part.A thermoacoustic noise eliminator 1 comprises a flow passage R to wh...
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JP2024011333A |
An object of the present invention is to provide a vehicle body rear structure capable of stably crushing a rear side frame when an impact load is input from the rear of the vehicle. A vehicle rear structure includes a rear wheel, a rear...
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JP2024502696A |
It includes a cylindrical body (1), a silencing chamber (11) is provided in the cylindrical body (1), a sound absorbing plate (2) is provided in the silencing chamber (11), and a sound absorbing plate (2) is provided on the inner wall of...
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JP7420547B2 |
To provide an exhaust pipe valve arranged in an exhaust pipe of an internal combustion engine, capable of suppressing ill effects of abnormal sound and wear while establishing a non-linear relation between force to open the valve and the...
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JP7419218B2 |
To provide a silencer or a component member of a silencer provided with another pipe outside a pipe and forming a space between both pipes, which can prevent condensate water from entering the space between the pipes and can increase deg...
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JP2023180456A |
To realize a function capable of suppressing stationary waves and a function capable of opening/closing a drain hole, with a simple configuration.The present invention relates to an exhaust device for exhausting exhaust gas. The exhaust ...
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JP7401124B2 |
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JP2023171352A |
To provide a fuel cell exhaust gas arrangement, by means of which liquid carried in fuel cell exhaust gas, in particular water, can be extracted from the fuel cell exhaust gas.Provided is a fuel cell exhaust gas arrangement for a fuel ce...
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JP7384112B2 |
To reduce a size of a muffler, and to activate a catalyst disposed in the muffler in an early stage.A muffler 21 comprises a cylindrical muffler body 25, a bulkhead 41 for forming first and second chambers by partitioning an internal spa...
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