US20020108807A1 - Soundproof cover for automobile - Google Patents

Soundproof cover for automobile Download PDF

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Publication number
US20020108807A1
US20020108807A1 US10/011,309 US1130901A US2002108807A1 US 20020108807 A1 US20020108807 A1 US 20020108807A1 US 1130901 A US1130901 A US 1130901A US 2002108807 A1 US2002108807 A1 US 2002108807A1
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United States
Prior art keywords
foam material
engine
soundproof cover
cover
noise
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
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US10/011,309
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English (en)
Inventor
Atsushi Murakami
Takumi Arisawa
Kazuo Nishimoto
Takahiro Niwa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nichias Corp
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Nichias Corp
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Assigned to NICHIAS CORPORATION reassignment NICHIAS CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ARISAWA, TAKUMI, MURAKAMI, ATSUSHI, NISHIMOTO, KAZUO, NIWA, TAKAHIRO
Publication of US20020108807A1 publication Critical patent/US20020108807A1/en
Abandoned legal-status Critical Current

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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/162—Selection of materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B77/00—Component parts, details or accessories, not otherwise provided for
    • F02B77/11—Thermal or acoustic insulation
    • F02B77/13—Acoustic insulation

Definitions

  • the present invention relates to a soundproof cover to be mounted on the engine of an automobile (hereinafter simply referred to as a “soundproof cover”).
  • Soundproof covers made of a foam material have been used as a noise insulation material for preventing the noise emitted from an engine of an automobile.
  • a soundproof cover for example, a soundproof cover as shown in FIG. 9 are commonly used.
  • the soundproof cover has a configuration for filling the gap between a cover main body 3 and an engine 10 by mounting a soundproof cover 1 on the engine 10 with a foam material 2 in a compressed state so as to recover the thickness by the elastic force of the foam material itself.
  • a soft urethane foam with an open-cell structure is used frequently as a soft and low cost material.
  • the noise insulation effect is improved merely slightly.
  • the noise insulation performance can be improved.
  • the foam material 2 is hard and has a high recovery force, the work of compressing the foam material 2 for mounting the soundproof cover 1 is difficult so that the soundproof cover mounting operativity is deteriorated.
  • the foam material 2 of the closed cells is thinned for improving the mounting property as shown in FIG. 10, a gap is generated with respect to the engine 10 so that the noise insulation effect is extremely deteriorated.
  • a foam material of the closed cells may be molded into a shape so as to fill the gap along the outer shape of the engine and sometimes used for a soundproof cover.
  • the foam material should be molded into a specific shape. This increases the production cost, and thus it is problematic.
  • the invention has been achieved, and an object thereof is to provide a soundproof cover for an automobile engine, satisfying the two contrary characteristics of the noise insulation performance and the mounting property.
  • the invention provides a soundproof cover to be mounted on the engine of an automobile, including a foam material having a mixed-cell structure of open cells and closed cells wherein the water absorption coefficient is 0.01 g/cm 3 or more and less than 0.5 g/cm 3 , provided along the circumferential rim of a cover main body surface facing an engine and projecting 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.
  • a foam material is disposed on the entirety of the engine side of a cover main body, but the sound insulation performance is not high despite the use of a large amount of the foam material.
  • the noise insulation effect can be improved only by providing the foam material only on the side wall part, compared with the structure conventionally used widely, which disposes a urethane form on the entirety of the cover. That is, despite use of a small amount of the foam material, the excellent noise insulation effect can be provided.
  • the foam material need not be compressed, the mounting operation onto the engine can be carried out extremely easily.
  • FIG. 1 is a sectional view showing an embodiment of a soundproof cover of the invention.
  • FIG. 2( a ) is a top view of the soundproof cover shown in FIG. 1
  • FIG. 2( b ) is a sectional view taken along a line I-I, showing the structure of the soundproof covers used in the embodiments 1, 2, and the comparative examples 1, 2.
  • FIG. 3( a ) is a top view of a soundproof cover of another embodiment of the invention
  • FIG. 3( b ) is a sectional view taken along a line I-I, showing the structure of the soundproof covers used in the embodiments 3, 4, 5, and the comparative example 4.
  • FIG. 4( a ) is a top view showing the structure of the soundproof cover used in the comparative example 4, and FIG. 4( b ) is a sectional view taken along a line I-I.
  • FIG. 5 is a schematic diagram of a testing device used in the embodiments.
  • FIG. 6 is a graph showing the noise level measurement results of the embodiments 1, 2, and the comparative examples 1, 2.
  • FIG. 7 is a graph showing the noise level measurement results of the embodiment 1, and the comparative examples 3, 4.
  • FIG. 8 is a graph showing the noise level measurement results of the embodiments 1, 3, 4, 5.
  • FIG. 9 is a sectional view showing a conventional embodiment of a soundproof cover.
  • FIG. 10 is a sectional view showing another conventional embodiment of a soundproof cover.
  • FIG. 1 is a sectional view showing a soundproof cover 1 of the invention. Similar to FIGS. 9 and 10, it is shown in the state mounted on an engine 10 .
  • FIG. 2( a ) is a top view
  • FIG. 2( b ) is a sectional view taken along a line I-I.
  • the soundproof cover 1 includes a foam material 2 projecting from the circumferential rim of the surface facing the engine 10 of a cover main body 3 to the engine side by a predetermined height.
  • the conventional soundproof cover in the case where a soundproof cover is mounted on an engine, the noise generated in the engine and reaching the outside can be classified roughly into the transmission noise transmitted through the soundproof cover and the leakage noise leaking from the gap between the soundproof cover and the engine.
  • the conventional soundproof cover (see FIG. 9) has the foam material 2 disposed on the entirety of the engine side opening part of the cover main body 3 , aiming at reduction of the transmission noise and the leakage noise simultaneously.
  • the effect is not sufficient. For example, a sufficient noise insulation performance cannot be obtained by a urethane foam, which has the excellent mounting property.
  • the soundproof cover 1 reduces the noise effectively by disposing the foam material 2 on the circumferential rim of the cover main body 3 so as to close the gap with respect to the engine 10 . That is, the noise insulation effect is improved, with the leakage noise as the target because it was found out that the leakage noise is dominant among the transmission noise and the leakage noise from the entire noise reaching the outside of the soundproof cover 1 so that the entire noise can be reduced by reducing the leakage noise.
  • the foam material 2 for closing the gap with respect to the engine 10 one having a specific property for effectively preventing leakage of the noise should be used.
  • a foam material having a mixed cell structure of open cells and closed cells, wherein a water absorption coefficient is 0.01 g/cm 3 or more and less than 0.5 g/cm 3 is used in order to meet the demand.
  • a foam material with the open cells have the cells communicating with each other, a sound wave transmits easily in the inside of the foam material. Since a foam material with the closed cells have the cells not communicating with each other, a sound wave cannot transmit easily in the inside of the foam material. Therefore, from the viewpoint of the noise insulation performance, a foam material with a large ratio of the closed cells is preferable as the soundproof foam material from the viewpoint of the noise insulation performance. In contrast, the recovery force of a compressed foam material is classified roughly into the recovery force of the cell wall and the recovery force of the inside air.
  • a foam material with the open cells have the air inside the foam material easily discharged to the outside through the communicating cells being compressed, only the recovery force of the cell wall functions so that the recovery force when it is compressed is small in most cases.
  • a foam material with the closed cells have the air inside the form material not easily discharged to the outside in the case it is compressed, both the recovery force of the cell wall and the recovery force of the air inside the foam material function so that the recovery force of the foam material being compressed is large in most cases.
  • the soundproof cover mounting property is deteriorated in the case where the recovery force of the compressed foam material is large, it is preferable to use a foam material with the open cells as the soundproof foam material from the viewpoint of the soundproof cover mounting property. Therefore, in order to satisfy both the noise insulation performance and the mounting property, it is preferable to use a foam material having a mixed cell structure of open cells and closed cells, with a specific ratio of the open cells and the closed cells.
  • a foam material with an open cell structure has a large water absorption coefficient
  • a foam material with a closed cell structure has a small water absorption coefficient.
  • a mixed cell structure of open cells and closed cells has an intermediate value therebetween. Therefore, by specifying the water absorption coefficient, the ratio of the open cells and the closed cells can be identified.
  • the water absorption coefficient is measured by the B method of the JIS K6767.
  • the water absorption coefficient of the foam material 2 used in the invention is 0.01 g/cm 3 or more and less than 0.5 g/cm 3 preferably 0.02 g/cm 3 or more and less than 0.2 g/cm 3 more preferably 0.04 g/cm 3 or more and less than 0.1 g/cm 3 .
  • the soundproof cover 1 having the excellent noise insulation performance and mounting property can be obtained.
  • the water absorption coefficient is larger than the range, since a sound wave easily transmits the inside of the form material 2 , the leakage noise cannot be insulated so that a sufficient noise insulation effect cannot be realized.
  • the mounting operativity is deteriorated due to the recovery force of the foam material 2 at the time of mounting the soundproof cover 1 on the engine.
  • the noise insulation performance of the foam material 2 is proportional to the weight measurement so that a substance with a higher bulk density provides a higher noise insulation performance in the case where the thickness of the substances is same.
  • a material with a high bulk density is hard, in most cases the recovery force when it is compressed is large. Since the soundproof cover mounting property is deteriorated in the case where the recovery force of the compressed foam material is large, it is preferable to use a foam material with a low bulk density as the foam material. Therefore, in order to satisfy both the noise insulation performance and the mounting property, it is preferable to use a foam material with a bulk density in a specific range.
  • the bulk density is preferably 20 kg/m 3 or more and less than 400 kg/m 3 , more preferably 30 kg/m 3 or more and less than 300 kg/m 3 , and further preferably 50 kg/m 3 or more and less than 200 kg/m 3 .
  • a foam material 2 with a bulk density in the range a soundproof cover having the excellent noise insulation performance and mounting property can be obtained.
  • the bulk density is smaller than the range, since a sound wave transmits easily in the inside of the foam material 2 , the leakage noise cannot be insulated so that a sufficient noise insulation effect cannot be realized.
  • the mounting operativity is deteriorated due to the recovery force of the foam material 2 at the time of mounting the soundproof cover 1 on the engine.
  • a soft foam material can sufficiently follow a complicated shape so as to provide a good initial close contact, and thus it is preferable.
  • a hard foam material has a low shape followability at the time it is compressed, and thus in the case where the engine outer shape is complicated, a gap may be generated.
  • a hard material also involves a problem in that the operativity at the time of mounting the soundproof cover is deteriorated due to the recovery force of the foam material. Therefore, in order to satisfy both the noise insulation performance and the mounting property, it is preferable to use a foam material with a hardness in a specific range.
  • the foam material hardness is measured as the 25% compression hardness by the JIS K6767.
  • the 25% compression hardness is preferably less than 0.5 N/cm 2 , more preferably 0.02 N/cm 2 or more and less than 0.1 N/cm 2 .
  • a foam material with a compression hardness in the range a soundproof cover having the excellent noise insulation performance and mounting property can be obtained.
  • the 25% compression hardness is larger than the range, a gap may be generated due to inability of following the outer shape of the engine 10 , and further, the mounting operativity is deteriorated due to the recovery force of the foam material 2 at the time of mounting the soundproof cover 1 on the engine 10 .
  • the main component of a foam material used in the invention is not particularly limited as long as the characteristics are satisfied.
  • Various kinds of polymer materials such as rubber, elastomer, a thermoplastic resin, a thermosetting resin, or the like can be used.
  • polymer materials examples include rubbers such as natural rubber, CR (chloroprene rubber), SBR (styrene butadiene rubber), NBR (nitrile-butadiene rubber), EPDM (ethylene-propylene-diene terpolymer copolymer), silicone rubber, fluoride rubber, and acrylic rubber; elastomers such as a thermoplastic elastomer and a soft urethane; thermoplastic resins such as polyethylene, polypropylene, polyamide, and a polyester; and thermosetting resins such as a urethane and an epoxy resin, but it is not limited thereto.
  • rubbers such as natural rubber, CR (chloroprene rubber), SBR (styrene butadiene rubber), NBR (nitrile-butadiene rubber), EPDM (ethylene-propylene-diene terpolymer copolymer), silicone rubber, fluoride rubber, and acrylic rubber
  • elastomers such as a thermoplastic elastomer and
  • a soundproof cover 1 having the excellent noise insulation performance and mounting property can be obtained.
  • a foam material 1 containing EPDM as the main component is used widely so that it can be obtained easily, and has the heat resistance, the ozone resistance, and the price is well balanced, it is preferable as the foam material 2 in the invention.
  • foam material 2 a foam material sheet of EPDM or NBR commercially available as a waterproof sealant for the construction or the weak charge may be used.
  • the material of the cover main body 3 used in the invention various metals such as irons aluminum, and stainless steel, and various resins such as nylon, polypropylene, and an unsaturated polyester can be used. It is also possible to add a filler and/or a fiber to the various resins. In particular, a material produced by adding a filler and/or a fiber to nylon or polypropylene has a light weight, and the excellent heat resistance and strength characteristic. Thus, it is preferable.
  • a soundproof cover 1 having the excellent mounting property and noise insulation performance can be obtained.
  • the foam material 2 need only to be provided on the circumferential rim of the cover main body 3 so that the amount of the foam material 2 can be cut back, and thus it is advantageous in terms of the cost.
  • the recovery force of the foam material is made lower so that the mounting property of the soundproof cover 1 can be improved as well.
  • FIGS. 3 ( a ) and 3 ( b ) are a top view, and FIG. 3( b ) is a sectional view taken along a line I-I
  • the same foam material 2 a can be provided on the facing surface 3 a , in addition to the circumferential rim of the cover main body 3 .
  • the noise insulation performance can further be improved.
  • the foam material 2 a to be provided on the facing surface 3 a need to have a thin thickness so as not to influence the mounting property.
  • the foam material 2 a provided on the facing surface 3 a and the foam material 2 provided on the circumferential rim may have different configurations.
  • the portion of using the soundproof cover 1 of the invention in addition to the upper part of the engine 10 as shown in the figures, for example, it can be used on the lower part of the engine for reduction of the noise from the lower part of the engine, or on the front surface or the side surface of the engine. Moreover, the entirety of the engine may be covered, or a part thereof may be covered. Furthermore, it may be used partially on the appliances to be the source of a noise, such as a fuel injection pump, and an intake manifold, and thus the portion of use is not limited thereto.
  • a noise such as a fuel injection pump, and an intake manifold
  • the soundproof cover has a structure shown in FIG. 2, and in the embodiment 3 and the comparative example 3, the soundproof cover has a structure shown in FIG. 3. Moreover, in the comparative example 4, the soundproof cover has a configuration of the sound proof cover having the foam material 2 on the facing surface 3 a of the cover main body 3 as shown in FIG. 4. Furthermore, the cover main body is made of a stainless steel.
  • a band-like EPDM foam material which is 15 mm in thickness, 30 mm in width, 100 kg/m 3 in bulk density, 0.071 g/cm 3 in water absorption coefficient, and 0.040 N/cm 2 in 25% compression hardness, was bonded only on the entire circumferential rim of the inside of the cover main body so as to provide a soundproof cover.
  • a band-like NBR foam material which is 15 mm in thickness, 30 mm in width, 120 kg/m 3 in bulk density, 0.058 g/cm 3 in water absorption coefficient, and 0.070 N/cm 2 in 25% compression hardness was bonded only on the entire circumferential rim of the inside of the cover main body so as to provide a soundproof cover.
  • An EPDM foam material having 100 kg/m 3 in bulk density, 0.071 g/cm 3 in water absorption coefficient, and 0.040 N/cm 2 in 25% compression hardness was bonded on the entire circumferential rim of the inside of the cover main body and the facing surface so as to provide a soundproof cover.
  • the foam material on the circumferential rim had a band-like shape, which is 15 mm in thickness and 30 mm in width, and the foam material on the facing surface had a flat plate-like shape, which is a size of 350 mm ⁇ 330 mm ⁇ a thickness of 15 mm.
  • a band-like EPDM foam material which is 15 mm in thickness, 30 mm in width, 100 kg/m 3 in bulk density, 0.071 g/cm 3 in water absorption coefficient, and 0.040 N/cm 2 in 25% compression hardness was bonded on the entire circumferential rim of the inside of the cover main body, and a soft urethane foam material, which is a size of 350 mm ⁇ 330 mm ⁇ a thickness of 15 mm, 25 kg/m 3 in bulk density, 0.076 g/cm 3 in water absorption coefficient, and 0.065 N/cm 2 in 25% compression hardness was bonded on the facing surface, respectively so as to provide a soundproof cover.
  • a band-like EPDM foam material which is 15 mm in thickness, 30 mm in width, 100 kg/m 3 in bulk density, 0.071 g/cm 3 in water absorption coefficient, and 0.040 N/cm 2 in 25% compression hardness was bonded on the entire circumferential rim of the inside of the cover main body, and an EPDM foam material, which is a size of 350 mm ⁇ 330 mm ⁇ a thickness of 15 mm, 460 kg/m 3 in bulk density, 0.028 g/cm 3 in water absorption coefficient, and 0.1 N/cm 2 in 25% compression hardness was bonded on the facing surface, respectively so as to provide a soundproof cover.
  • a band-like soft urethane foam material which is 15 mm in thickness, 30 mm in width, 25 kg/m 3 in bulk density, 0.076 g/cm 3 in water absorption coefficient, and 0.065 N/cm 2 in 25% compression hardness was bonded only on the entire circumferential rim of the inside of the cover main body so as to provide a soundproof cover.
  • a band-like EPDM foam material which is 15 mm in thickness, 30 mm in width, 460 kg/m 3 in bulk density, 0.028 g/cm 3 in water absorption coefficient, and 1.05 N/cm 2 in 25% compression hardness was bonded only on the entire circumferential rim of the inside of the cover main body so as to provide a soundproof cover.
  • An foam material which is 25 kg/m 3 in bulk density, 0.076 g/cm 3 in water absorption coefficient, and 0.065 N/cm 2 in 25% compression hardness was bonded on the entire circumferential rim of the inside of the cover main body and the facing surface so as to provide a soundproof cover.
  • the foam material on the circumferential rim had a band-like shape, which is 15 mm in thickness and 30 mm in width, and the foam material on the facing surface had a flat plate-like shape, which is a size of 350 mm ⁇ 330 mm ⁇ a thickness of 15 mm thickness size.
  • An EPDM foam material which is a size of 350 mm ⁇ 330 mm ⁇ a thickness of 15 mm, 100 kg/m 3 in bulk density, 0.071 g/cm 3 in water absorption coefficient, and 0.040 N/cm 2 in 25% compression hardness was bonded only on the facing surface of the cover main body so as to provide a soundproof cover.
  • the noise insulation performance was evaluated for the soundproof covers of the embodiments and the comparative embodiments using a measurement device shown in FIG. 5. That is, the soundproof cover 20 was fixed on an aluminum plate with the foam material disposed on the lower side by M6 bolts 23 via pedestals 21 having a round sectional shape, a diameter of 20 mm, and a height of 40 mm. Each pedestal 21 was provided with a bolt hole on the soundproof cover side so as to provide the bolt fastening part of the soundproof cover at 4 portions.
  • a speaker 24 was placed on the aluminum plate 22 , and further, it was covered with a box 25 , which has a size of 425 mm ⁇ 320 mm ⁇ a height of 20 mm.
  • the box 25 includes a metal side plate 25 a and a mesh-like upper plate 25 b .
  • a white noise was radiated from the speaker 24 and the noise level was measured with a noise meter by picking up the noise by a microphone 26 installed immediately above the soundproof cover 20 by 50 mm for evaluation of the noise insulation performance.
  • the noise level was measured for the 250 to 5,000 Hz frequency range by a 1 ⁇ 3 octave band resolution. A lower value represents a low noise level and a high noise insulation performance.
  • a cover mounting property was evaluated by the maximum torque at the time of fastening the bolts in mounting the soundproof cover 20 on the plate 22 .
  • a lower maximum torque at the time of fastening the bolts represents a better cover mounting property.
  • the ratchet functions when the torque exceeds a preset torque. The ratchet does not function when it is not more than the preset torque.
  • the ratchet setting was at 120 kg ⁇ cm so that in the case where the maximum torque of any of the four bolts 23 was 120 kg ⁇ cm or more, the mounting property was judged to be not passed “ ⁇ ”, and in the case the maximum torque of all of the four bolts 23 was less than 120 kg ⁇ cm, the mounting property was judged to be passed “ ⁇ ”.
  • the noise level of the embodiments 1, 2, and the comparative examples 1, 2 are shown in FIG. 6.
  • the noise level of the embodiment 1, and the comparative examples 3, 4 are shown in FIG. 7.
  • the noise level of the embodiments 1, 3, 4, 5 are shown in FIG. 8.
  • the cover mounting property evaluation results are shown in Table 2.
  • the kinds and the bonding portion of the foam materials of the embodiments and the comparative examples are shown in FIG. 1. TABLE 1 Emb. 1 Emb. 2 Emb. 3 Emb. 4 Emb. 5 Comp. 1 Comp. 2 Comp. 3 Comp.
  • the embodiments provide good noise insulation performance and cover mounting property.
  • the comparative examples 1 and 3 provide a small maximum torque and a good cover mounting property as in the embodiments, since a foam material with the open cells was used, the noise level was high due to the sound wave transmission inside the foam material and the noise insulation performance was low.
  • the comparative example 3 having a structure widely used as a soundproof cover provides an insufficient noise insulation effect.
  • the comparative example 2 provides a good noise insulation performance similar to the embodiments, since a foam material with the closed cells was used, it is problematic in terms of the cover mounting property.
  • the comparative example 4 having a foam material disposed only on the facing surface part of the cover main body provides a low noise insulation performance due to the noise leakage from the circumferential rim gap.
US10/011,309 2000-12-12 2001-12-11 Soundproof cover for automobile Abandoned US20020108807A1 (en)

Applications Claiming Priority (2)

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JPP2000-377615 2000-12-12
JP2000377615A JP2002180845A (ja) 2000-12-12 2000-12-12 自動車エンジン用防音カバー

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EP (1) EP1215381B1 (ja)
JP (1) JP2002180845A (ja)
DE (1) DE60130532D1 (ja)

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US20050022548A1 (en) * 2003-07-29 2005-02-03 Sishtla Vishnu M. Sound jacket for noise reduction in refrigeration apparatus
US20050189165A1 (en) * 2004-02-12 2005-09-01 Mathur Gopal P. Method and apparatus for reducing acoustic noise
US20060065474A1 (en) * 2004-09-30 2006-03-30 Nichias Corporation Soundproof cover
US20100044148A1 (en) * 2008-08-20 2010-02-25 Rento Tanase Sound absorbing structure using closed-cell porous medium
US20110020592A1 (en) * 2009-07-21 2011-01-27 Eurocopter Insulating coating with mass amplification
US20110033324A1 (en) * 2009-08-10 2011-02-10 Schaefer James A Compressor Having Counterweight Cover
US20160233736A1 (en) * 2015-02-11 2016-08-11 Carcoustics Techconsult Gmbh Three-dimensionally contoured, acoustically effective heat shield for a motor vehicle and method for the production thereof
CN109154265A (zh) * 2016-07-26 2019-01-04 宝马股份公司 机动车燃料泵遮盖装置、具有这种遮盖装置的机动车燃料泵以及遮盖装置制造方法

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JP4040486B2 (ja) * 2003-02-10 2008-01-30 トヨタ自動車株式会社 発泡樹脂製オイルパン及びその製造方法
DE10332171B4 (de) * 2003-07-15 2010-09-23 Carcoustics Techconsult Gmbh Schallisolierendes Gehäuseteil aus Kunststoff für Brennkraftmaschinen oder Fahrzeuggetriebe
CN109927284B (zh) * 2019-04-02 2024-04-26 苏州慧通汇创科技有限公司 一种隔音性好的dlp激光快速成型3d打印机机箱
JP7060632B2 (ja) * 2020-01-17 2022-04-26 ニチアス株式会社 吸音遮熱カバーおよびエンジンユニット

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JP3504810B2 (ja) * 1996-09-11 2004-03-08 東海ゴム工業株式会社 車両用制振吸音部材
EP1020846B1 (en) * 1999-01-14 2018-09-19 Nichias Corporation Sound absorbing structure
JP3322845B2 (ja) * 1999-03-19 2002-09-09 ニチアス株式会社 吸音構造体
JP2000220467A (ja) * 1999-01-28 2000-08-08 Tokai Rubber Ind Ltd 低吸水・低吸油性防音材

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US20050022548A1 (en) * 2003-07-29 2005-02-03 Sishtla Vishnu M. Sound jacket for noise reduction in refrigeration apparatus
US6932190B2 (en) * 2003-07-29 2005-08-23 Carrier Corporation Sound jacket for noise reduction in refrigeration apparatus
US20050189165A1 (en) * 2004-02-12 2005-09-01 Mathur Gopal P. Method and apparatus for reducing acoustic noise
US7267196B2 (en) * 2004-02-12 2007-09-11 The Boeing Company Method and apparatus for reducing acoustic noise
US20060065474A1 (en) * 2004-09-30 2006-03-30 Nichias Corporation Soundproof cover
US20100044148A1 (en) * 2008-08-20 2010-02-25 Rento Tanase Sound absorbing structure using closed-cell porous medium
US20110020592A1 (en) * 2009-07-21 2011-01-27 Eurocopter Insulating coating with mass amplification
US8876091B2 (en) * 2009-07-21 2014-11-04 Airbus Helicopters Insulating coating with mass amplification
US20110033324A1 (en) * 2009-08-10 2011-02-10 Schaefer James A Compressor Having Counterweight Cover
US8974198B2 (en) 2009-08-10 2015-03-10 Emerson Climate Technologies, Inc. Compressor having counterweight cover
US20160233736A1 (en) * 2015-02-11 2016-08-11 Carcoustics Techconsult Gmbh Three-dimensionally contoured, acoustically effective heat shield for a motor vehicle and method for the production thereof
CN109154265A (zh) * 2016-07-26 2019-01-04 宝马股份公司 机动车燃料泵遮盖装置、具有这种遮盖装置的机动车燃料泵以及遮盖装置制造方法
US20190153984A1 (en) * 2016-07-26 2019-05-23 Bayerische Motoren Werke Aktiengesellschaft Motor Vehicle Fuel Pump Cover, Motor Vehicle Fuel Pump Having Such a Cover, and Method for Producing Said Cover
US10883459B2 (en) * 2016-07-26 2021-01-05 Bayerische Motoren Werke Aktiengesellschaft Motor vehicle fuel pump cover, motor vehicle fuel pump having such a cover, and method for producing said cover

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EP1215381A3 (en) 2003-04-23
JP2002180845A (ja) 2002-06-26
EP1215381A2 (en) 2002-06-19
EP1215381B1 (en) 2007-09-19
DE60130532D1 (de) 2007-10-31

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