WO2020217863A1 - Natte contenant des fibres inorganiques et structure de réduction du bruit pour le tuyau d'échappement - Google Patents

Natte contenant des fibres inorganiques et structure de réduction du bruit pour le tuyau d'échappement Download PDF

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Publication number
WO2020217863A1
WO2020217863A1 PCT/JP2020/014394 JP2020014394W WO2020217863A1 WO 2020217863 A1 WO2020217863 A1 WO 2020217863A1 JP 2020014394 W JP2020014394 W JP 2020014394W WO 2020217863 A1 WO2020217863 A1 WO 2020217863A1
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inorganic
inorganic fiber
molded body
thickness
needle
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PCT/JP2020/014394
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English (en)
Japanese (ja)
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森川　修
森　正
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ニチアス株式会社
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    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4209—Inorganic fibres
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4209—Inorganic fibres
    • D04H1/4218—Glass fibres
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/44—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling
    • D04H1/46—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/24—Silencing apparatus characterised by method of silencing by using sound-absorbing materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/08—Other arrangements or adaptations of exhaust conduits

Definitions

  • the present invention relates to an inorganic fiber-containing mat and a sound reduction structure for an exhaust pipe.
  • the noise of the automobile is not only the noise generated from the drive system engine room such as the engine, motor, and transmission, but also the exhaust noise, wind noise, tire road noise, etc.
  • noise reduction measures are required for each of them, but in the evaluation test method adopted in ECE R51, measures for exhaust noise are particularly required.
  • the above exhaust noise is the exhaust manifold, exhaust manifold direct type catalytic converter, front pipe, underfloor catalytic converter, sub muffler (center muffler), main muffler, tail end pipe, muffler cutter, etc., in which the engine combustion gas is sequentially connected from the engine exhaust section.
  • the specific gravity of the acceleration noise is higher than that of the conventional measurement method. This is because the exhaust noise accounts for about 1/4 of the total noise level.
  • acceleration noise from a speed of 40 km / h is targeted, and in particular, the specific gravity occupied by noise in a relatively low frequency region of 1 kHz or less increases, so countermeasures are urgently needed.
  • the present invention provides a novel inorganic fiber-containing mat and exhaust that have sufficient sound reduction performance especially for low-frequency sound of 1 kHz or less even if the thickness is thin, and also has excellent heat resistance and heat insulation. It is an object of the present invention to provide a sound reduction structure for pipes.
  • inorganic fiber molding composed of a needle-processed inorganic fiber having a ventilation resistance of 0.7 to 1.5 kPa ⁇ s / m and a thickness of 5 to 30 mm. It has been found that the above technical problems can be solved by an inorganic fiber-containing mat characterized by having a body as a base material, and the present invention has been completed based on this finding.
  • the present invention (1) An inorganic fiber-containing mat characterized by having an inorganic fiber molded body made of an inorganic fiber needle processed product having a ventilation resistance of 0.7 to 1.5 kPa ⁇ s / m and a thickness of 5 to 30 mm as a base material. (2) The inorganic according to (1) above, wherein the inorganic fiber molded body has 80 to 100% of needle-machined holes having a hole diameter of 0.05 to 0.70 mm in all needle-machined holes on the surface. Fiber-containing mat, (3) The inorganic fiber-containing mat according to (1) or (2) above, wherein the inorganic fiber is glass fiber.
  • a sound reduction structure for an exhaust pipe having an inorganic fiber-containing mat arranged between the inner pipe and the outer pipe of an automobile exhaust pipe having a coaxial double cylindrical structure of an inner pipe and an outer pipe.
  • the inorganic fiber-containing mat has a base material made of an inorganic fiber molded product and has a base material.
  • a base material made of a needle-processed inorganic fiber molded product having a predetermined thickness exhibits heat resistance and heat insulating properties as well as sound reduction (sound absorption) characteristics, and the airflow resistance is constant as the inorganic fiber molded product.
  • sound reduction sound absorption
  • FIG. 1A is a vertical sectional view in the direction perpendicular to the longitudinal direction of exhaust pipe 1 for vehicles
  • FIG. b) is a vertical cross-sectional view taken along the longitudinal direction of the vehicle exhaust pipe 1.
  • FIG. 1A is a vertical sectional view in the direction perpendicular to the longitudinal direction of exhaust pipe 1 for vehicles
  • FIG. b) is a vertical cross-sectional view taken along the longitudinal direction of the vehicle exhaust pipe 1.
  • the inorganic fiber-containing mat according to the present invention is characterized by having an inorganic fiber molded body made of a needle-processed inorganic fiber having a ventilation resistance of 0.7 to 1.5 kPa ⁇ s / m and a thickness of 5 to 30 mm as a base material. Is to be.
  • the inorganic fibers constituting the inorganic fiber molded product those having an average fiber diameter of 5 to 20 ⁇ m are preferable, those having an average fiber diameter of 5 to 15 ⁇ m are more preferable, and those having an average fiber diameter of 7 to 10 ⁇ m are further preferable.
  • the average fiber diameter of the inorganic fiber means an arithmetic mean value when the cross-sectional diameter of 400 points arbitrarily extracted in the cross-sectional observation image by a scanning electron microscope (SEM) is measured.
  • the inorganic fibers constituting the inorganic fiber molded product those having an average fiber length of 20 to 300 mm are preferable, those having an average fiber length of 40 to 200 mm are more preferable, and those having an average fiber length of 60 to 100 mm are further preferable.
  • the average fiber length of the inorganic fibers means the arithmetic mean value when the fiber lengths of 400 arbitrarily extracted inorganic fibers are measured with a dial thickness gauge manufactured by Peacock.
  • Examples of the inorganic fiber constituting the inorganic fiber molded body include one or more selected from glass fiber, silica fiber, alumina fiber, silica alumina fiber, rock wool, basalt fiber, zirconia fiber and the like, which are economical and available. Glass fiber is preferable in consideration of ease of use and the like.
  • the inorganic fiber-containing mat As the inorganic fiber molded body, a needle processed product obtained by needle punching an inorganic fiber is used.
  • the inorganic fiber is introduced into the needle punching device, and a large number of needles having barbs (protrusions) are produced at high speed.
  • a felt-like molded body having a porous shape By reciprocating up and down and entwining (entangled) the inorganic fibers with each other, a felt-like molded body having a porous shape can be obtained.
  • the inorganic fiber molded body as the base material has a hole diameter of 0.05 in all the needle-processed holes on the surface of the base material as the pore diameter of the needle-processed holes averaged in the mat thickness direction.
  • the needle is preferably made of an inorganic fiber needle processed product in which the ratio of the needle processed holes of about 0.70 mm is 80 to 100%, and the ratio of the needle processed holes having a hole diameter of 0.05 to 0.70 mm in all the needle processed holes is It is more preferable that the needle is made of an inorganic fiber needle processed product having a diameter of 85 to 100%, and the ratio of the needle processed hole having a hole diameter of 0.05 to 0.70 mm to the total needle processing hole is 90 to 100%. Those made of processed products are more preferable.
  • the hole diameter of the needle-processed hole provided on the surface of the inorganic fiber molded body is determined from the tomographic photograph of the hole measured by an X-ray CT device (Skyscan1272 Micro-CT manufactured by BRUKER).
  • the pore volume from the needle entry surface) to the back surface is obtained, and the height of the cylinder is similar to that of a cylinder having the same height as the height from the front surface to the back surface of the inorganic fiber molded body and having the same volume as the pore volume. Means diameter.
  • the ratio of the needle-machined holes having a hole diameter of 0.05 to 0.70 mm to the total needle-machined holes on the surface of the base material made of the inorganic fiber molded body is, for example, a needle to be attached to a needle punching device used when manufacturing the inorganic fiber molded body ( It can be controlled by adjusting the needle diameter of the needle).
  • the ratio of the needle-processed holes having a hole diameter of 0.05 to 0.70 mm to the total needle-processed holes on the surface of the base material made of the inorganic fiber molded body is within the above range, that is, Due to the high proportion of small-diameter needle-machined holes on the surface of the inorganic fiber molded body, when used as a base material for an inorganic fiber-containing mat, sound loss due to the needle-machined holes is suppressed and a desired sound reduction (sound absorption) effect is obtained. It can be easily exerted.
  • the aeration resistance of the inorganic fiber molded body as a base material is 0.7 to 1.5 kPa ⁇ s / m and 0.8 to 1.5 kPa ⁇ s / m. It is preferably 0.8 to 1.2 kPa ⁇ s / m, and more preferably 0.8 to 1.2 kPa ⁇ s / m.
  • the airflow resistance of the inorganic fiber molded body is based on the breathability A method (Frazier type method) specified in JIS L 1096, and the inorganic fiber molded body to be measured has a thickness of 15 mm and a bulk density of 130 kg /.
  • the flow rate of air when air is passed in the direction perpendicular to the main surface at a differential pressure of 0.125 kPa flows through the flow resistance measuring instrument (product name: KES-F8-AP1). , Made by Kato Tech Co., Ltd., and converted to ventilation resistance.
  • the thickness of the inorganic fiber molded product is 5 to 30 mm, preferably 5 to 20 mm, and more preferably 5 to 10 mm.
  • the thickness of the inorganic fiber molded body means the arithmetic mean value when the thickness of 10 arbitrarily extracted inorganic fiber molded bodies is measured with a dial thickness gauge manufactured by Peacock.
  • the inorganic fiber-containing mat since the thickness of the inorganic fiber molded body as the base material is within the above range, the inorganic fiber-containing mat can be easily installed even in a narrow space under the vehicle floor. Can be done.
  • the inorganic fiber molded body When the inorganic fiber molded body is arranged between the inner pipe and the outer pipe of an automobile exhaust pipe having a coaxial double cylindrical structure of the inner pipe and the outer pipe described later, heat insulation and sound insulation are improved. It is desirable that the thickness (mm) of the inorganic fiber molded body is a length equal to or greater than the distance (mm) between the inner tube and the outer tube.
  • the inorganic fiber-containing mat according to the present invention is arranged between the inner pipe and the outer pipe of an automobile exhaust pipe having a coaxial double cylindrical structure of the inner pipe and the outer pipe described later, the inner pipe and the outer pipe
  • the ratio of the thickness of the inorganic fiber molded body to the distance to the outer tube is preferably 100 to 400%, more preferably 100 to 300%, and even more preferably 100 to 200%.
  • the thickness of the inorganic fiber molded product is preferably 5 to 15 mm, more preferably 6 to 12 mm, and even more preferably 8 to 10 mm.
  • the thickness of the inorganic fiber molded body means the arithmetic average value when the thickness of 10 arbitrarily extracted inorganic fiber molded bodies is measured with a dial thickness gauge manufactured by Peacock Co., Ltd.
  • the distance between the tube and the outer tube also means the value measured by the dial thickness gauge manufactured by Peacock.
  • the inorganic fiber-containing mat when the thickness of the inorganic molded body is equal to or greater than the distance between the inner and outer pipes and is therefore arranged between the inner and outer pipes of the automobile exhaust pipe. ,
  • the inorganic fiber-containing mat based on the inorganic fiber molded body is held in a pressed state between the inner pipe (exhaust pipe) and the outer pipe (cylindrical heat shield plate), so that it has sufficient elasticity. It is possible to exert (repulsive force) and exhibit desired sound reduction (sound absorption) while suitably suppressing vibration of the outer pipe.
  • the bulk density of the inorganic fiber molded body is preferably 50 ⁇ 300kg / m 3, more preferably from 80 ⁇ 200kg / m 3, more preferably 100 ⁇ 160kg / m 3.
  • the bulk density of the inorganic fiber molded body is obtained by measuring the thickness of the inorganic fiber molded body cut out to 100 mm ⁇ 100 mm with a caliper or the like to determine the volume, and the weight separately measured by an electronic balance is divided by the above volume. It means the value obtained by.
  • the inorganic fiber-containing mat when the thickness and bulk density of the inorganic fiber molded body are within the above ranges, the inorganic fiber-containing mat exhibits desired heat resistance and heat insulating properties, and has a sound-reducing structure for an exhaust pipe. It becomes easy to suppress the thermal deterioration of the member on the vehicle body side facing the body, and the internal temperature of the exhaust pipe sound reduction structure can be easily controlled within a certain range.
  • the inorganic fiber-containing mat according to the present invention is preferably one in which an inorganic binder is dispersed in a base material made of an inorganic fiber molded body.
  • examples of the inorganic binder include one or more selected from viscous minerals such as bentonite, borosilicate glass, colloidal silica, colloidal alumina and the like.
  • the inorganic fiber-containing mat according to the present invention is obtained by dispersing 0.5 to 5% by mass of an inorganic binder in 95 to 99.5% by mass of a base material made of an inorganic fiber molded body when converted to solid content. It is more preferable that the inorganic binder 1 to 3% by mass is dispersed in 97 to 99% by mass of the base material made of the inorganic fiber molded body, and the base material 97 to 99% by mass made of the inorganic fiber molded body is more preferable. It is more preferable that the inorganic binder is dispersed in 98% by mass in an amount of 2 to 3% by mass.
  • the inorganic fiber-containing mat according to the present invention is formed by dispersing a predetermined amount of an inorganic binder in a base material made of an inorganic fiber molded body, the inorganic binder adheres to the intersections of the inorganic fibers constituting the base material. As a result, the binding points between the fibers can be increased and the integrity can be enhanced. Further, when the exhaust sound vibrates (solid-propagates) as a compressional wave and a transverse wave to the inorganic fiber skeleton constituting the inorganic fiber-containing mat, the inorganic fiber constituting the mat is vibrated and deformed around the plurality of binding points.
  • the solid-borne sound attenuation effect causes friction with the void wall when the exhaust sound propagates through the voids between the inorganic fibers as a coarse and dense wave, and the sound pressure energy is converted into thermal energy.
  • the attenuation effect is high in the low frequency region of 1 kHz or less, and it is considered that the attenuation effect is dominant especially in the range of 300 to 500 Hz.
  • the binding point cannot be sufficiently formed, and if the amount of the inorganic binder is too large with respect to the inorganic fiber molded body amount (base material amount), Since the inorganic binder is dispersed so as to fill the entire gap between the inorganic fibers constituting the inorganic fiber molded body and the inorganic fibers are firmly bonded to each other, it is difficult for the inorganic fibers to be attenuated due to vibration.
  • the mixture is appropriately squeezed with a felt roller or the like to adjust the impregnation amount or to perform a drying treatment. It can be done by things such as.
  • the inorganic fiber-containing mat according to the present invention has an inorganic porous film having a ventilation resistance of 1.8 to 2.6 kPa ⁇ s / m on one side main surface of a base material made of an inorganic fiber molded body. Is preferable.
  • Examples of the inorganic porous membrane include one or more selected from bentonite-containing membranes and the like, and bentonite-containing membranes are preferable.
  • the inorganic porous membrane means a membrane containing an inorganic porous substance such as bentonite as an inorganic binder.
  • Bentonite contains montmorillonite as the main component, and silicate minerals such as quartz, ⁇ -Christovalite, and opal as subcomponents, silicate minerals such as pebbles, mica, and zeolite, and carbonate minerals such as calcite, dolomite, and gypsham. It is a weakly alkaline clay mineral that can contain sulfide minerals such as sulphate minerals and pyrite.
  • the inorganic porous membrane preferably contains an inorganic binder in an amount of 85 to 100% by mass, more preferably 90 to 100% by mass, and even more preferably 95 to 100% by mass.
  • the thickness of the inorganic porous film is preferably 10 to 1,000 ⁇ m, more preferably 100 to 1,000 ⁇ m, and even more preferably 200 to 500 ⁇ m. ..
  • the thickness of the inorganic porous film means the arithmetic mean value when the cross section of the inorganic fiber-containing mat is observed at 50 points with a microscope.
  • the pore size of the inorganic porous film is preferably 0.01 to 2%, more preferably 0.01 to 1%, and 0.01 to 0. It is more preferably 5.5%. Further, in the inorganic fiber-containing mat according to the present invention, the pore size of the inorganic porous membrane is preferably 0.1 to 400 ⁇ m, more preferably 0.1 to 100 ⁇ m, and 0.1 to 10 ⁇ m. It is more preferable to have.
  • the pore size of the inorganic porous membrane was determined by (obtained SEM) when the surface of the inorganic porous membrane was observed with an SEM (JEOL Ltd., JSF-6300A).
  • An aggregated inorganic binder in which an observation range of 100 ⁇ m ⁇ 100 ⁇ m in an image is subjected to image analysis processing and black-and-white binarization processing, and the area of the black portion is approximately calculated as the pore (gap) area excluding the detection particle area represented by white. It means the arithmetic average value at any 50 points of the pore opening ratio calculated by (total area of pores between particles / area of inorganic porous film) ⁇ 100.
  • the opening diameter of the inorganic porous film is black and white by performing image analysis processing on the observation range of 100 ⁇ m ⁇ 100 ⁇ m in the obtained SEM image when the surface of the inorganic porous film is observed by the above SEM. After digitizing and determining the area of each of the 50 holes displayed in black formed between the detection particles represented in white, a circle having the same area as each hole area. It means the arithmetic mean value when the diameter is individually calculated as the pore diameter between the aggregated inorganic binder particles.
  • the inorganic porous film exhibits the same degree of flexibility as the inorganic fiber molded body, especially within the above-mentioned film thickness range, and serves as a constituent film of the inorganic fiber-containing mat between the inner and outer pipes of the exhaust pipe for automobiles. Even when it is bent and arranged, it can be easily arranged while being integrally deformed with the inorganic fiber molded body.
  • the aeration resistance of the inorganic porous film provided on the main surface of the base material made of the inorganic fiber molded body is preferably 1.8 to 2.6 kPa ⁇ s / m. It is more preferably 1.8 to 2.5 kPa ⁇ s / m, and even more preferably 1.8 to 2.3 kPa ⁇ s / m.
  • the air permeability of the inorganic porous film is determined from the air-permeable A method (Frazier type method) specified in JIS L1096 for the inorganic fiber molded body coated with the inorganic binder from the coated surface side of the inorganic binder.
  • the flow rate of air when air is passed through at a differential pressure of 0.125 kPa in the direction perpendicular to the main surface of the fiber molded body is measured by a flow resistance measuring instrument (manufactured by Kato Tech Co., Ltd., product name: KES-F8-AP1). ) And converted to ventilation resistance.
  • the inorganic porous film can be formed by aggregating and fixing the solid content when the inorganic binder-containing liquid is applied to the inorganic fiber molded body to form the film. Breathability can be exhibited by the gaps formed between the fine particles constituting the membrane.
  • the ventilation resistance of the inorganic porous membrane can be easily controlled by adjusting the concentration of the inorganic binder contained in the inorganic binder-containing liquid or the like.
  • the inorganic fiber-containing mat according to the present invention can further improve the sound reduction characteristic by the resonance effect (resonance effect) due to the membrane vibration of the inorganic porous membrane having the above-mentioned predetermined ventilation resistance.
  • Inorganic fiber-containing mats with an inorganic porous film on one side are considered to have Helmfortz-type film vibration (resonance) characteristics, and Masaru Koyasu (Theory of Sound Insulation / Absorption Materials and Composite Materials, Journal of the Japan Society for Composite Materials, No. Based on the report of Vol. 2, No. 4 (1976)), the maximum value (structural resonance frequency) f 0 of the resonance frequency of the sound absorption performance of the inorganic fiber-containing mat according to the present invention can also be expressed by the following equation (1). Conceivable.
  • Tr Ventilation resistance of inorganic porous membrane (kPa ⁇ s / m)
  • Tr0 Ventilation resistance of inorganic fiber molded product (kPa ⁇ s / m) Is. )
  • the structural resonance frequency f 0 which is the maximum value of the resonance frequency of the inorganic fiber-containing mat, can be arbitrarily specified by controlling the ventilation resistance Tr of the inorganic porous membrane.
  • the structural resonance frequency f 0 of the inorganic fiber-containing mat is controlled to a frequency of 1 kHz or less by controlling the ventilation resistance Tr of the inorganic porous film within a predetermined range. Therefore, it is considered that the sound absorption characteristic (sound reduction characteristic) in the low frequency region of 1 kHz or less can be effectively improved.
  • An inorganic fiber-containing mat provided with an inorganic porous film on one side main surface can be produced by applying an inorganic binder-containing liquid to one side main surface of an inorganic fiber molded body.
  • the inorganic binder-containing liquid include an aqueous solution containing an inorganic binder.
  • the concentration of the inorganic binder in the inorganic binder-containing liquid is preferably 0.5 to 5% by mass.
  • the method of applying the inorganic binder-containing liquid is not particularly limited, and examples thereof include spray coating, brush coating, and roller coating.
  • a base material made of an inorganic fiber molded product having a predetermined thickness exhibits heat absorption and heat insulating properties as well as sound absorption (sound reduction) characteristics, and the sound reduction characteristics of the base material made of an inorganic fiber molded body are exhibited. It can be easily improved by controlling the ventilation resistance. In particular, the suppression of sound loss due to the small diameter needle processing hole, the resonance effect due to the membrane vibration of the inorganic porous film having a predetermined ventilation resistance, or the vibration damping property (inorganic) due to the increase in the binding point between the inorganic fibers due to the predetermined amount of the inorganic binder. It can be further enhanced by the damping effect of sound pressure energy due to the vibration of fibers).
  • the thickness of the inorganic fiber-containing mat according to the present invention is preferably 5 to 30 mm, more preferably 5 to 20 mm, and even more preferably 5 to 10 mm.
  • the thickness of the inorganic fiber-containing mat means the arithmetic mean value when the thicknesses of 10 arbitrarily extracted inorganic fiber-containing mats are measured with a dial thickness gauge manufactured by Peacock.
  • the inorganic fiber-containing mat according to the present invention even if the thickness is thin, it has sufficient sound reduction performance especially for low frequency sound of 1 kHz or less, and can exhibit excellent heat resistance and heat insulation.
  • the sound reduction structure for an exhaust pipe according to the present invention is a reduction structure for an exhaust pipe having an inorganic fiber-containing mat arranged between the inner pipe and the outer pipe of an automobile exhaust pipe having a coaxial double cylindrical structure of an inner pipe and an outer pipe. It is a sound structure
  • the inorganic fiber-containing mat has a base material made of an inorganic fiber molded product and has a base material.
  • the inorganic fiber molded body is characterized by being made of a needle-processed inorganic fiber having a ventilation resistance of 0.7 to 1.5 kPa ⁇ s / m and a thickness of 5 to 30 mm.
  • the sound reduction structure for an exhaust pipe according to the present invention is formed by arranging an inorganic fiber-containing mat between the inner pipe and the outer pipe of an automobile exhaust pipe having a coaxial double cylindrical structure of an inner pipe and an outer pipe.
  • the exhaust pipe for arranging the sound reduction structure according to the present invention is not particularly limited as long as it is a pipe that discharges exhaust gas from an automobile.
  • FIG. 1 is a cross-sectional view showing an example of an embodiment of the exhaust pipe sound reduction structure 1 according to the present invention
  • FIG. 1 (a) is a vertical cross section in a direction perpendicular to the longitudinal direction of the exhaust pipe sound reduction structure 1.
  • FIG. 1B is a vertical cross-sectional view of the exhaust pipe sound reduction structure 1 along the longitudinal direction.
  • the sound reduction structure 1 for an exhaust pipe has an inner pipe 2.
  • the inner pipe means an exhaust pipe through which exhaust gas (combustion gas) flows, and the inner pipe is made of a material corresponding to the temperature of the exhaust gas flowing inside, and the purpose is It is preferable to appropriately select from those capable of exhibiting the temperature characteristics and sound absorption characteristics.
  • the inner tube one having heat resistance is preferable, and specific examples thereof include a metal tube and a resin tube made of a heat-resistant resin, and a metal tube is preferable.
  • a stainless steel pipe As the metal pipe, a stainless steel pipe (SUS pipe) is mainly used from the viewpoint of heat resistance and corrosion resistance, but an aluminum pipe (aluminum pipe) may also be used.
  • the average thickness of the inner tube is preferably 0.5 to 2.0 mm, more preferably 0.7 to 1.8 mm, and further preferably 0.9 to 1.6 mm. Appropriate.
  • the average thickness of the inner tube means the arithmetic mean value when the thickness at 10 points is measured with a caliper.
  • the outer diameter of the inner tube is preferably 20 to 90 mm, more appropriately 30 to 80 mm, and even more appropriately 40 to 70 mm. In this application document, the outer diameter of the inner tube means a value measured by a caliper.
  • the cross-sectional shape of the inner tube is not particularly limited, and may be circular or elliptical as shown in the cross-sectional view in FIG. 1A. Further, the inner tube may be formed by providing a plurality of holes in the side wall in the longitudinal direction thereof, or may be formed of, for example, punching metal.
  • the exhaust pipe sound reduction structure 1 has an outer pipe 3 provided coaxially with the inner pipe 2 on the outer periphery of the inner pipe (exhaust pipe) 2. There is.
  • the outer pipe means a tubular heat shield plate that can suppress the heat radiated from the exhaust gas flowing inside the exhaust pipe to the vehicle body side, and the vehicle body. It is preferable to appropriately select from a material having heat resistance corresponding to the heat radiated to the side and not causing deterioration or the like, and a metal one is preferable.
  • stainless steel As the metal constituting the outer tube, stainless steel (SUS) is mainly used from the viewpoint of heat resistance, corrosion resistance, aesthetics, etc., and aluminum may be used, but the emissivity is low and the aesthetics are high. Therefore, stainless steel is preferable.
  • the average thickness of the outer tube is preferably 0.5 to 2.0 mm, more preferably 0.7 to 1.8 mm, and further preferably 0.9 to 1.6 mm. Appropriate.
  • the average thickness of the outer tube means the arithmetic mean value when the thickness at 10 points is measured with a caliper.
  • the outer diameter of the outer tube is preferably 24 to 114 mm, more appropriately 34 to 104 mm, and even more appropriately 44 to 94 mm. In this application document, the outer diameter of the outer tube means a value measured by a caliper.
  • the cross-sectional shape of the outer tube is not particularly limited, and as shown in FIG. 1A, it may be substantially circular, oval, or the like.
  • the inner pipe or the outer pipe may be an integrally molded product or a joint product of a divided product.
  • the outer pipe 3 has an upper heat shield plate 3a in which a tubular object is half-split and a tubular object in half. It may be made of a joint with the lower heat shield plate 3b. Since the outer pipe 3 is composed of a half-split upper heat shield plate 3a and a half-split lower heat shield plate 3b, the inorganic fiber-containing mat is wound around the inner pipe, and then the upper heat shield is applied to the outer periphery thereof. By interposing the plate 3a and the lower heat shield plate 3b and joining them together, the sound reduction structure for the exhaust pipe according to the present invention can be easily manufactured.
  • the muffler cutter is described as an example, but the coaxial double cylindrical structure composed of the inner pipe and the outer pipe is formed over the entire exhaust pipe for automobiles or in a part other than the muffler cutter.
  • the exhaust pipe sound reducing structure according to the present invention may be formed.
  • the sound reduction structure 1 for an exhaust pipe according to the present invention is an inorganic fiber-containing mat arranged between an inner pipe 2 and an outer pipe 3 provided coaxially with the inner pipe 2. It has 4.
  • the inorganic fiber-containing mat include the inorganic fiber-containing mat according to the present invention, and the details thereof are as described above.
  • the inner tube and the outer tube have an inorganic fiber-containing mat having predetermined characteristics, even if the thickness is thin, it has sufficient sound reduction performance particularly for low frequency sound of 1 kHz or less. At the same time, it is possible to provide a new sound reduction structure for an exhaust pipe having excellent heat resistance and heat insulation.
  • Example 1 Manufacturing process of glass fiber molded body While adjusting the thickness with a thickness adjusting roller, glass fibers having an average fiber diameter of 10 ⁇ m and an average fiber length of 100 mm are introduced into a needle punching device, and a large number of needles having barbs (protrusions) (protrusions). By reciprocating (needle diameter 0.58 mm) up and down at high speed and entwining (interlacing) the glass fibers with each other, a felt-like glass fiber molded body having a porous shape (thickness 6 mm, bulk density 100 kg / m) 3. The ratio of needle-machined holes with a hole diameter of 0.05 to 0.70 mm to the total needle-machined holes on the surface is 95%).
  • Impregnation step of inorganic binder The glass fiber molded body having a thickness of 6 mm is impregnated with an aqueous dispersion having a bentonite content of 2.5% by mass and squeezed with a felt roller to convert the impregnation amount into solid content. After adjusting to 2.5% by mass, it was dried and impregnated with bentonite inside, and dispersed in an inorganic binder-containing glass fiber molded body (content ratio of glass fiber molded body 97.5% by mass, bentonite). Content ratio of 2.5% by mass) was obtained.
  • an aqueous dispersion having a bentonite concentration of 10% by mass is roller-coated on one side of the main surface of the inorganic binder-containing glass fiber molded body obtained in (2), and the coated surface is coated.
  • a bentonite-containing film (thickness 0.2 mm, pore size 0.5%, aeration resistance 2.) was formed on the inner main surface of the glass fiber molded body by winding it in a cylindrical shape with the inner peripheral surface side as the inner peripheral surface side and then drying it.
  • a glass fiber-containing mat (thickness 10 mm, inner diameter 40 mm, outer diameter 60 mm) having a cylindrical shape as a whole was obtained, forming 3 kPa ⁇ s / m and a bentonite content of 100% by mass).
  • the inner pipe (exhaust pipe) 2 is a SUS pipe in the shape of a punching metal having a plurality of openings provided on the entire side wall in the longitudinal direction. (Inner diameter 38 mm, outer diameter 40 mm) was prepared, and a SUS pipe (inner diameter 60 mm, outer diameter 62 mm) was prepared as the outer pipe (heat shield plate on the cylinder) 3.
  • a gap having a width of 10 mm is formed between them.
  • FIG. 1 the inner pipe (exhaust pipe) 2 is a SUS pipe in the shape of a punching metal having a plurality of openings provided on the entire side wall in the longitudinal direction.
  • Example 1 by inserting the glass fiber-containing mat obtained in Example 1 into the gap between the inner tube 2 and the outer tube 3, the inner tube and the outer tube have a coaxial double cylindrical structure.
  • a sound reduction structure 1 for an exhaust pipe in which a mat material was arranged between the inner pipe and the outer pipe was produced.
  • the surface provided with the bentonite-containing film was arranged so as to face the inner tube.
  • the sound absorption characteristics of the exhaust pipe sound reduction structure 1 were measured by the method shown in FIG. That is, as shown in FIG. 5, tubular bodies T 1 and T 2 having an inner diameter equal to the inner diameter of the inner pipe 2 are arranged coaxially with the inner pipe 2 at both ends of the exhaust pipe sound reduction structure 1. At the same time, two condenser microphones M on the sound incident side A and B / sound transmission side C and D were arranged on the tubular bodies T 1 and T 2 . In this state, when the speaker (Fostex Co.
  • the sound reduction structure 1 for the exhaust pipe obtained in Example 1 is excellent in heat resistance and heat insulation, and even if the thickness is thin, the transmission loss (transmission loss, especially in the low frequency region around 800 Hz to 1.25 kHz) ( It can be seen that it is excellent in volume reduction).
  • the sound reduction characteristic is that the glass fiber-containing mat has a predetermined ventilation resistance, so that a spring effect having a Helmfortz type film vibration (resonance) characteristic is generated, and particularly in a low frequency range of 800 Hz to 1.25 kHz. It is probable that this was caused by the larger vibration damping.
  • the glass fiber molded body having a thickness of 6 mm is impregnated with an aqueous dispersion having a bentonite content of 5% by mass and squeezed with a felt roller to reduce the impregnation amount to 5 in terms of solid content. After adjusting to mass%, it is wound into a cylinder so that the cross-sectional diameter is 60 mm, dried, and then impregnated with bentonite and dispersed.
  • the overall shape has a cylindrical shape and a thickness of 10 mm. A glass fiber molded product containing an inorganic binder was obtained.
  • Example 1 Filling Step of Inorganic Binder-Containing Glass Fiber Molded Body
  • the inorganic binder-containing glass fiber molded body obtained in the above (3) is used as the inner tube 2 and the outer tube.
  • a sound-reducing structure for a comparative exhaust pipe having a coaxial double cylindrical structure of an inner pipe and an outer pipe and a mat material arranged between the inner pipe and the outer pipe was produced. ..
  • the inorganic binder-containing glass fiber molded body obtained in Comparative Example 1 is inferior in sound reduction performance particularly in the low frequency region because the base material made of the glass fiber molded body does not have predetermined physical properties. I understand.
  • Example 2 Manufacturing process of glass fiber molded body While adjusting the thickness with a thickness adjusting roller, glass fibers having an average fiber diameter of 10 ⁇ m and an average fiber length of 100 mm are introduced into a needle punching device, and a large number of needles having barbs (protrusions) (protrusions).
  • Impregnation step of inorganic binder The glass fiber molded body having a thickness of 6 mm is impregnated with an aqueous dispersion having a bentonite content of 2.5% by mass and squeezed with a felt roller to convert the impregnation amount into solid content. After adjusting to 2.5% by mass, it was dried and impregnated with bentonite inside, and dispersed in an inorganic binder-containing glass fiber molded body (content ratio of glass fiber molded body 97.5% by mass, bentonite). Content ratio of 2.5% by mass) was obtained.
  • a glass fiber-containing mat (thickness 10 mm, inner diameter 40 mm, outer diameter 60 mm) having a cylindrical shape as a whole was obtained, forming 1.83 kPa ⁇ s / m and bentonite content (100% by mass).
  • (4) Filling Step of Glass Fiber-Containing Mat Using the glass fiber-containing mat obtained in (3) above, the glass fiber-containing mat is combined with the inner tube 2 and the outer tube 3 in the same manner as in Example 1 (4). By inserting it into the gap, a sound reduction structure 1 for an exhaust pipe having a coaxial double cylindrical structure of an inner pipe and an outer pipe and having a mat material arranged between the inner pipe and the outer pipe was produced.
  • the surface provided with the bentonite-containing film was arranged so as to face the inner tube.
  • Example 3 Manufacturing process of glass fiber molded body While adjusting the thickness with a thickness adjusting roller, glass fibers having an average fiber diameter of 10 ⁇ m and an average fiber length of 100 mm are introduced into a needle punching device, and a large number of needles having barbs (protrusions) (protrusions). By reciprocating (needle diameter 0.58 mm) up and down at high speed and entwining (interlacing) the glass fibers with each other, a felt-like glass fiber molded body having a porous shape (thickness 6 mm, bulk density 100 kg / m) 3. The ratio of needle-machined holes with a hole diameter of 0.05 to 0.70 mm to the total needle-machined holes on the surface is 95%).
  • Impregnation step of inorganic binder The glass fiber molded body having a thickness of 6 mm is impregnated with an aqueous dispersion having a bentonite content of 2.5% by mass and squeezed with a felt roller to convert the impregnation amount into solid content.
  • a bentonite-containing film (thickness 0.18 mm, pore size 0.55%, ventilation resistance 1.) was formed on the inner main surface of the glass fiber molded body by winding it in a cylindrical shape with the inner peripheral surface side and then drying it.
  • a glass fiber-containing mat (thickness 10 mm, inner diameter 40 mm, outer diameter 60 mm) having a cylindrical shape as a whole was obtained, which formed 9 kPa ⁇ s / m and a bentonite content of 100% by mass).
  • (4) Filling Step of Glass Fiber-Containing Mat Using the glass fiber-containing mat obtained in (3) above, the glass fiber-containing mat is combined with the inner tube 2 and the outer tube 3 in the same manner as in Example 1 (4).
  • a sound reduction structure 1 for an exhaust pipe having a coaxial double cylindrical structure of an inner pipe and an outer pipe and having a mat material arranged between the inner pipe and the outer pipe was produced.
  • the glass fiber-containing mat was inserted into the gap between the inner tube 2 and the outer tube 3, the surface provided with the bentonite-containing film was arranged so as to face the inner tube.
  • Example 4 Manufacturing process of glass fiber molded body While adjusting the thickness with a thickness adjusting roller, glass fibers having an average fiber diameter of 10 ⁇ m and an average fiber length of 100 mm are introduced into a needle punching device, and a large number of needles having barbs (protrusions) (protrusions). By reciprocating (needle diameter 0.58 mm) up and down at high speed and entwining (interlacing) the glass fibers with each other, a felt-like glass fiber molded body having a porous shape (thickness 6 mm, bulk density 100 kg / m) 3. The ratio of needle-machined holes with a hole diameter of 0.05 to 0.70 mm to the total needle-machined holes on the surface is 95%).
  • Impregnation step of inorganic binder The glass fiber molded body having a thickness of 6 mm is impregnated with an aqueous dispersion having a bentonite content of 2.5% by mass and squeezed with a felt roller to convert the impregnation amount into solid content.
  • a bentonite-containing film (thickness 0.19 mm, pore size 0.55%, ventilation resistance 2.) was formed on the inner main surface of the glass fiber molded body by winding it in a cylindrical shape with the inner peripheral surface side and then drying it.
  • a glass fiber-containing mat (thickness 10 mm, inner diameter 40 mm, outer diameter 60 mm) having a cylindrical shape as a whole was obtained, which formed 05 kPa ⁇ s / m and had a bentonite content of 100% by mass).
  • (4) Filling Step of Glass Fiber-Containing Mat Using the glass fiber-containing mat obtained in (3) above, the glass fiber-containing mat is combined with the inner tube 2 and the outer tube 3 in the same manner as in Example 1 (4).
  • a sound reduction structure 1 for an exhaust pipe having a coaxial double cylindrical structure of an inner pipe and an outer pipe and having a mat material arranged between the inner pipe and the outer pipe was produced.
  • the glass fiber-containing mat was inserted into the gap between the inner tube 2 and the outer tube 3, the surface provided with the bentonite-containing film was arranged so as to face the inner tube.
  • Example 5 Manufacturing process of glass fiber molded body While adjusting the thickness with a thickness adjusting roller, glass fibers having an average fiber diameter of 10 ⁇ m and an average fiber length of 100 mm are introduced into a needle punching device, and a large number of needles having barbs (protrusions) (protrusions). By reciprocating (needle diameter 0.58 mm) up and down at high speed and entwining (interlacing) the glass fibers with each other, a felt-like glass fiber molded body having a porous shape (thickness 6 mm, bulk density 100 kg / m) 3. The ratio of needle-machined holes with a hole diameter of 0.05 to 0.70 mm to the total needle-machined holes on the surface is 95%).
  • Impregnation step of inorganic binder The glass fiber molded body having a thickness of 6 mm is impregnated with an aqueous dispersion having a bentonite content of 2.5% by mass and squeezed with a felt roller to convert the impregnation amount into solid content.
  • a bentonite-containing film (thickness 0.18 mm, pore opening rate 0.5%, airflow resistance 2.) was formed on the inner main surface of the glass fiber molded body by winding the glass fiber molded body in a cylindrical shape and then drying it.
  • a glass fiber-containing mat (thickness 10 mm, inner diameter 40 mm, outer diameter 60 mm) having a cylindrical shape as a whole was obtained, which formed 1 kPa ⁇ s / m and a bentonite content of 100% by mass).
  • (4) Filling Step of Glass Fiber-Containing Mat Using the glass fiber-containing mat obtained in (3) above, the glass fiber-containing mat is combined with the inner tube 2 and the outer tube 3 in the same manner as in Example 1 (4).
  • a sound reduction structure 1 for an exhaust pipe having a coaxial double cylindrical structure of an inner pipe and an outer pipe and having a mat material arranged between the inner pipe and the outer pipe was produced.
  • the glass fiber-containing mat was inserted into the gap between the inner tube 2 and the outer tube 3, the surface provided with the bentonite-containing film was arranged so as to face the inner tube.
  • Example 2 the sound reduction structure 1 for exhaust pipes obtained in any of Examples 2 to 5 (ventilation resistance is 1.83 kPa ⁇ s / m (Example 2), respectively).
  • the sound absorption property was measured in the same manner as in Example 1 except that the above was used.
  • the OA value (dB sum) of the transmission loss between 800 Hz and 1.25 kHz in Examples 1 to 5 was determined.
  • the OA value (dB sum) of the transmission loss of the glass fiber-containing mats constituting the sound-reducing structure 1 for each exhaust pipe, which were measured by the above methods, is the ventilation resistance of the bentonite-containing film provided on the surface of each glass fiber-containing mat.
  • the result of plotting against is shown in FIG.
  • the OA value (dB sum) of the transmission loss of the glass fiber-containing mats constituting the sound-reducing structure 1 for each exhaust pipe, which were measured by the above methods, is the ventilation resistance of the bentonite-containing film provided on the surface of each glass fiber-containing mat.
  • the result of plotting against is shown in FIG.
  • FIG. 6 shows the results of plotting the ventilation resistance with respect to the needle processing holes (average value) of each molded body.
  • FIG. 6 shows the results of plotting the ventilation resistance with respect to the needle processing holes (average value) of each molded body.
  • FIG. 6 shows the results of plotting the ventilation resistance with respect to the needle processing holes (average value) of each molded body.
  • the sound absorption property was evaluated by the following methods using the glass fiber molded products having a thickness of 15 mm obtained in Examples 6 to 15 and Comparative Examples 2 to 7.
  • Each glass fiber molded body whose ventilation resistance was measured was punched into a circular shape having a predetermined size, and a sample plate provided in an impedance tube (type 4206 manufactured by Bruel Care Japan Co., Ltd.) so as to be perpendicular to the axis of the tube. Installed in. At this time, the thickness and density of each sample are 15 mm and 130 kg / m 3 , respectively.
  • White noise (white noise) is input from the inlet side (front side) of the tube toward the back plate side (back side), and the vertical incident sound absorption coefficient from 100 Hz to 6300 Hz is measured at the 1/3 octave band center frequency. did. Then, the OA value (sum) of the sound absorption coefficient at 800 Hz, 1 kHz, 1.25 kHz, 1.6 kHz, and 2 kHz of each of the obtained glass fiber molded product samples was determined.
  • FIG. 7 shows the results of plotting the OA value (sum) of the sound absorption coefficient of the glass fiber molded body measured by the above methods with respect to the aeration resistance of the sample made of each glass fiber molded body.
  • a novel inorganic fiber-containing mat and a sound-reducing structure for an exhaust pipe which have sufficient sound-reducing performance especially for low-frequency sounds of 1 kHz or less even if the thickness is thin and have excellent heat resistance and heat insulation.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)
  • Nonwoven Fabrics (AREA)

Abstract

La présente invention concerne une nouvelle natte contenant des fibres inorganiques qui obtient une réduction suffisante du bruit pour un son à basse fréquence, en particulier à 1 kHz ou moins, et qui présente une excellente résistance à la chaleur et une excellente isolation thermique même si la natte est mince.　La natte contenant des fibres inorganiques comprend, en tant que substrat, un aggloméré de fibres inorganiques qui est constitué d'un ouvrage à l'aiguille en fibres inorganiques ayant une résistance à l'écoulement de l'air de 0,7-1,5 kPa∙s/m et une épaisseur de 5-30 mm. À la surface de l'aggloméré de fibres inorganiques, des trous d'aiguille ayant un diamètre de pore de 0,05-0,70 mm représentent de préférence 80 à 100 % de la totalité des trous d'aiguille.
PCT/JP2020/014394 2019-04-26 2020-03-27 Natte contenant des fibres inorganiques et structure de réduction du bruit pour le tuyau d'échappement WO2020217863A1 (fr)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04203308A (ja) * 1990-11-29 1992-07-23 Yasuhiro Okuda 内燃機関の消音器
WO2014141418A1 (fr) * 2013-03-14 2014-09-18 名古屋油化株式会社 Matériau insonorisant et isolant thermique et article moulé en un matériau insonorisant et isolant thermique
WO2019004153A1 (fr) * 2017-06-26 2019-01-03 ニチアス株式会社 Matériau de revêtement d'insonorisation et unité de moteur
JP2019191345A (ja) * 2018-04-24 2019-10-31 株式会社ヒロタニ 車両用耐熱防音材

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04203308A (ja) * 1990-11-29 1992-07-23 Yasuhiro Okuda 内燃機関の消音器
WO2014141418A1 (fr) * 2013-03-14 2014-09-18 名古屋油化株式会社 Matériau insonorisant et isolant thermique et article moulé en un matériau insonorisant et isolant thermique
WO2019004153A1 (fr) * 2017-06-26 2019-01-03 ニチアス株式会社 Matériau de revêtement d'insonorisation et unité de moteur
JP2019191345A (ja) * 2018-04-24 2019-10-31 株式会社ヒロタニ 車両用耐熱防音材

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