CN102192010A - Sound shielding structure and sound shielding cover - Google Patents
Sound shielding structure and sound shielding cover Download PDFInfo
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- CN102192010A CN102192010A CN2011100430608A CN201110043060A CN102192010A CN 102192010 A CN102192010 A CN 102192010A CN 2011100430608 A CN2011100430608 A CN 2011100430608A CN 201110043060 A CN201110043060 A CN 201110043060A CN 102192010 A CN102192010 A CN 102192010A
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Abstract
The present invention provides a sound shielding structure and a sound shielding cover, which can improve the sound shielding performance without weight increase. A split is provided on a cover body (2) around a combination part (3) between an engine and a cover body (2) for reducing the rigidity of the combination part (3). Therefore, a resonance transmission frequency which is determined by the weight of the cover body (2) and rigidity of an air layer and ridigity of the combination part (3) is reduced.
Description
Technical field
The present invention relates to noises such as motor, outlet pipe at automobile produce the source near the screening sound structure and the sound-insulation cover of setting.
Background technique
Automobiles etc. are when engine operation, and engine main body, food tray, outlet pipe etc. vibrate and the generation noise.As this noise countermeasure, proposed various noise produce the source near the sound-insulation cover of screening sound.
In addition, patent documentation 2 discloses a kind of food tray lid of mobile engine, it is in the formation on every side and the food tray opposed opposed flange of mounting flange on every side of the lid main body of food tray lid, on the foaming body of the internal surface that is formed at opposed flange, form the recess of the head can accommodate the external screw that is used for installing food tray, by the foaming body of accommodating the head of external screw at recess is connected airtight in mounting flange, thereby be suppressed at the vibration of mounting flange part.
The prior art document
Patent documentation
Patent documentation 1:JP spy opens flat 11-350970 communique
Patent documentation 2:JP spy opens the 2004-278446 communique
But, near noise generation source, be provided with under the situation of sound-insulation cover, can produce sound-insulation cover and see through phenomenon with the sympathetic response that a certain characteristic frequency resonates.Sympathetic response sees through the frequency (sympathetic response sees through frequency) of phenomenon generation by the rigidity (spring constant when air layer works as spring) of the air layer between weight, noise generation source and the sound-insulation cover of sound-insulation cover and rigidity (spring constant when work as spring in the connecting part) decision of the connecting part that noise produces source and sound-insulation cover.Because sympathetic response is radiated from sound-insulation cover through the vibration that phenomenon passes to sound-insulation cover again, so sound isolation property can worsen.
At this problem, at present the countermeasure that adopts is to produce to insert between source and the sound-insulation cover at noise to attract material, or increases the weight etc. of sound-insulation cover, but all can cause the increase of weight, from energy-conservation viewpoint, and requires light-weighted trend antithesis.
Summary of the invention
The purpose of this invention is to provide a kind of screening sound structure and sound-insulation cover that under the situation of not gaining in weight, just can improve the sound isolation property energy.
Screening sound structure of the present invention is characterized in that it has:
The lid main body, it covers at least a portion that noise produces the source across air layer;
The connecting part, described noise is produced the source for it and described lid main body is carried out combination; And
Slit, it is that the center is arranged on the described lid main body with described connecting part.
According to said structure, when the sympathetic response that sound isolation property can worsen covering main body resonance sees through the phenomenon generation, sound isolation property can see through the frequency decision by sympathetic response, sympathetic response sees through weight and the rigidity of air layer and the rigidity decision of connecting part of frequency by the lid main body, but produce from noise on the configuration relation of source and lid main body, owing to can't change the rigidity of air layer,, reduce the rigidity of connecting part so on the lid main body, slit is set.Thus, reduce, therefore can under the situation of not gaining in weight, improve the sound isolation property energy because sympathetic response sees through frequency.In addition,, can avoid the increase of number of spare parts, therefore can suppress cost and rise by on the lid main body, slit being set.In addition, the rigidity of so-called air layer is meant at the spring constant of air layer during as spring action, the spring constant the when rigidity of so-called connecting part is meant in the connecting part as spring action.
In addition, screening sound structure of the present invention is characterized in that it has:
The lid main body, it covers at least a portion that noise produces the source across air layer; And
The connecting part, described noise is produced the source for it and described lid main body is carried out combination;
Described connecting part has:
Through hole, it is arranged in the mode that runs through described lid main body and covers on the main body;
A pair of fixed component, it is installed in the described through hole, and the secure component that is fastened on the described noise generation source runs through described a pair of fixed component; And
A pair of elastomer, it is arranged between the described a pair of fixed component, and described lid main body is carried out clamping.
According to said structure, when the sympathetic response that sound isolation property can worsen covering main body resonance sees through the phenomenon generation, sound isolation property can see through the frequency decision by sympathetic response, sympathetic response sees through weight and the rigidity of air layer and the rigidity decision of connecting part of frequency by the lid main body, but produce from noise on the configuration relation of source and lid main body, owing to can't change the rigidity of air layer,, reduce the rigidity of connecting part by with a pair of elastomer clamp cover main body.Thus, reduce, therefore can under the situation of not gaining in weight, improve the sound isolation property energy because sympathetic response sees through frequency.In addition, because lid main body and connecting part are the branch body structures, therefore can design the rigidity of connecting part easily based on elastomeric spring constant.
In screening sound structure of the present invention, also can be that at least a portion of the end of described lid main body contacts with described noise generation source in addition, produce at least a portion in the gap in source with end and the described noise that covers described lid main body.According to said structure, contact with noise generation source by at least a portion that makes the end of covering main body, thereby the end of at least a portion tegmentum main body in the gap in the end of lid main body and noise generation source covers, and therefore, suppresses noise and produces the clearance leakage in source from end and the noise that covers main body.In addition, be accompanied by the vibration that noise produces the source, produce between source and the lid main body at noise and produce relative displacement, produce friction in contact segment, so vibrational energy is converted to heat energy, vibration obtains decay.Thus, can improve the sound isolation property energy.In addition, the enlarged areas of the end by making the lid main body that contacts with noise generation source or dwindle can be controlled the friction-produced amount.
In addition, in screening sound structure of the present invention, also can be that described screening sound structure also has the curtain-shaped cover member that at least a portion that end and described noise to described lid main body produce the gap in source covers, one end of described curtain-shaped cover member is installed on described noise and produces the source, and the other end of described curtain-shaped cover member is installed on described lid main body.According to said structure owing to cover the end of main body and noise produces at least a portion in the gap in source with curtain-shaped cover member, so inhibition from the noise of this clearance leakage to external leaks.Thus, can improve the sound isolation property energy.
In addition, in screening sound structure of the present invention, described curtain-shaped cover member can have damping property.According to this structure, the damping property (damping) by curtain-shaped cover member has makes through curtain-shaped cover member and passes to the vibration attenuation of covering main body from noise generation source, therefore, suppresses to cover the resonance of main body.Thus, can improve the sound isolation property energy.
In addition, in screening sound structure of the present invention, described lid main body can make up a plurality of planes and constitute.According to said structure,, make up a plurality of planes and constitute and cover main body and then more make the rigidity reduction of cover main body by the situation that curved surface constitutes than the lid main body, therefore, cover emission efficiency (being transformed to the efficient of sound from the vibration) step-down of main body.Thus, owing to reduce, can improve the sound isolation property energy from the radiation again of lid main body.
In addition, in screening sound structure of the present invention, on described lid main body, can be provided with a plurality of fine holes.According to this structure, when when lid is provided with a plurality of fine holes on the main body, producing the attenuation that attenuation that viscous resistance causes and dynamic pressure loss cause by the air in the air layer of fine holes, therefore the sound wave by fine holes is by sound-absorbing.Thus, the emission efficiency of lid main body descends, and therefore the reduction of radiation again from the lid main body can improve the sound isolation property energy.Especially, when the opening rate of fine holes is 0.1% left and right sides, keep sound isolation property energy, can reduce the noise that sympathetic response sees through frequency simultaneously high frequency.
In addition, in screening sound of the present invention structure, be set to below the resonance frequency by the described lid main body of the rigidity decision of the weight of described lid main body and described air layer by the eigentone of the described lid main body of the rigidity decision of the weight of described lid main body and described connecting part.According to said structure, sympathetic response sees through eigentone and the resonance frequency decision of frequency by the lid main body, but from light-weighted viewpoint, under the situation that alleviates the weight of covering main body, if the rigidity of connecting part remains unchanged, the eigentone and the resonance frequency that then cover main body uprise, and sympathetic response sees through frequency and also uprises, so sound isolation property can worsen.On the other hand, under the situation that alleviates the weight of covering main body, if the rigidity of connecting part also reduces together, then can keep lower lid main body eigentone, be that sympathetic response sees through frequency, sound isolation property can be kept or be improved.And, if reduce the rigidity of connecting part, the eigentone of covering main body is set at below the resonance frequency, then, therefore can improve the sound isolation property energy because sympathetic response reduces through frequency.
In addition, sound-insulation cover of the present invention is characterised in that and has above-mentioned screening sound structure.According to said structure, can fully reduce the noise in the source that produces from noise.
The invention effect
According to screening sound structure of the present invention and sound-insulation cover, by reducing the rigidity of connecting part, sympathetic response sees through frequencies go lower, therefore, can improve the sound isolation property energy under the situation of not gaining in weight.
Description of drawings
Fig. 1 is the summary side elevation of expression vehicle;
Fig. 2 is the skeleton diagram of hood;
Fig. 3 is the approximate vertical view of connecting part periphery;
Fig. 4 is the figure of expression equivalence model;
Fig. 5 is the coordinate diagram of the relation of expression frequency and sound isolation property energy;
Fig. 6 is the coordinate diagram of the relation of expression frequency and sound isolation property energy;
Fig. 7 is the coordinate diagram of the relation of expression frequency and sound isolation property energy;
Fig. 8 is the summary side elevation of connecting part;
Fig. 9 is the skeleton diagram of hood;
Figure 10 is the summary side elevation of connecting part;
Figure 11 is the approximate three-dimensional map of connecting part;
Figure 12 is the summary side elevation of connecting part;
Figure 13 is the coordinate diagram of the relation of expression frequency and sound isolation property energy;
Figure 14 is the coordinate diagram of the relation of expression frequency and sound isolation property energy;
Figure 15 is the approximate three-dimensional map that covers the end of main body;
Figure 16 is the approximate three-dimensional map that covers the end of main body;
Among the figure:
1,51,101,102,201,202-hides the sound structure
2-covers main body
2a～2u-plane
2x, 2y-end
3,53-connecting part
The 4-fine holes
The 5-mounting hole
The 6-slit
10,110-hood (sound-insulation cover)
The 11-vehicle
12,112-motor
The 13-food tray
The 14-outlet pipe
The 21-air layer
54a, 54b-fixed component
55a, 55b-elastomer
The 56-through hole
The 57-bolt hole
61,71-curtain-shaped cover member
The 112a-protuberance
The 112b-side
Embodiment
Below in conjunction with description of drawings preferred implementation of the present invention.
[first mode of execution]
(formation of vehicle)
As shown in Figure 1, the hood 10 as the sound-insulation cover of present embodiment is arranged on the vehicles 11 such as automobile.On vehicle 11, be provided with motor 12, accumulate the food tray 13 of engine oil and outlet pipe 14 that the waste gas of discharging from motor 12 passes through, their vibrations and produce noise when motor 12 work.The hood 10 of present embodiment across air layer 21 cover the source that produces as noise motor 12 above, blocking is from the noise of motor 12.What in addition, hood 10 also can covering engine 12 is whole.
(formation of hood)
As shown in Figure 2, hood 10 has the main body of lid 2 and hides sound structure 1, hides sound structure 1 and possesses connecting part 3, connecting part 3 combining cover main bodys 2 and motor 12.Connecting part 3 is arranged on four jiaos that cover main body 2.
Lid main body 2 constitutes by making up 21 plane 2a～2u.Be positioned at four jiaos plane 2r, 2s, 2t, 2u covering main body 2 and be respectively equipped with connecting part 3.Each plane 2a～2u has the par by the long length more than 1/2 of the Qu Bobo of the frequency decision of the noise of motor 12 generations.So, cover main body 2 than being made of curved surface, make up a plurality of planes and constitute then the rigidity that main body 2 is covered in more reduction, the wavelength of the Qu Bo that propagates in lid main body 2 shortens, therefore, and emission efficiency (being transformed to the efficient of sound from the vibration) step-down of lid main body 2.
In addition, on lid main body 2, the opening rate with 0.1% is provided with a plurality of fine holes 4.Result from the attenuation that the viscous resistance of fine holes 4 causes producing by the air in the air layer 21 of fine holes 4.By this viscous resistance, the vibrational energy of the air vibration that the air in the air layer 21 has is converted to heat energy, and air vibration obtains decay, therefore passes through the sound wave of fine holes 4 by sound-absorbing.In addition, result from the attenuation that the crushing resistance (dynamic pressure loss) of dynamic pressure of fine holes 4 causes producing by the air in the air layer 21 of fine holes 4.This dynamic pressure loss is general known as the dynamic pressure loss based on Bernoulli's law.Under this dynamic pressure loss effect, the vibrational energy of the air vibration that the air in the air layer 21 has is converted to heat energy, and air vibration obtains decay, therefore passes through the sound wave of fine holes 4 by sound-absorbing.
A portion enlarged view as Fig. 2 is promptly shown in Figure 3, connecting part 3 have the mounting hole 5 of perforation on lid main body 2 and pass this mounting hole 5 and with engagement portions (not shown) such as fastening bolt of motor 12 or pin.In addition, hiding sound structure 1 is the center with connecting part 3, has the slit 6 that is provided with on lid main body 2.In addition, motor 12 and lid main body 2 also can not used secure component such as bolt and combination.At this moment, do not need mounting hole 5.
Shown in Fig. 3 (a), can on the same circumference that with connecting part 3 is the center, four slits 6 be set, shown in Fig. 3 (b), also can on two different circumference that with connecting part 3 are the center, four slits 6 be set respectively, shown in Fig. 3 (c), can be that vortex shape is arranged to slit 6 in the center also with connecting part 3.In addition, shown in Fig. 3 (d), the slit 6 of two straight line shapies can be set in the mode that clips connecting part 3, shown in Fig. 3 (e), also can be according to being that the circular arc at center and shape that straight line combines are provided with two slits 6 with connecting part 3.The quantity of slit 6, shape and size can suitably be selected, and make connecting part 3 become the rigidity of hope.So, by slit 6 being set, the rigidity step-down of connecting part 3 in lid main body 2.
At this, shown in Fig. 4 (a), if will be considered as spring respectively by connecting part 3 and the air layer 21 between the main body 2, then as Fig. 4 (b) shown in, can represent with the equivalence model of the spring arranged side by side 31 that adopted the equivalent mass 32 that covers main body 2 and connecting part 3 and air layer 21 at motor 12 and lid.
In Fig. 4 (a), when when motor 12 produces noises, produce with connecting part 3 and air layer 21 as spring, 2 resonance of lid main body and the sympathetic response that sound isolation property can worsen through phenomenon.Be Ka, the rigidity (connecting part 3 as spring action time spring constant) during for K of establishing connecting part 3 in to establish the weight of covering main body 2 be M, establish air layer 21 rigidity (air layer 21 as spring action time spring constant), sympathetic response sees through the frequency (sympathetic response sees through frequency) that phenomenon produces and is directly proportional with the square root of (Ka+K)/M.Pass to the vibration of covering main body 2 through phenomenon by sympathetic response and radiated from lid main body 2 again, the sound isolation property that therefore hides sound structure 1 can worsen.
In addition, shown in Fig. 4 (a), vibration 3 passes to from motor 12 and to cover main body 2 through the connecting part.Pass to the vibration of covering main body 2 owing to radiated from lid main body 2, the sound isolation property that therefore hides sound structure 1 can worsen again.
Produce sympathetic response that sound isolation property can worsen in the resonance of lid main body 2 when seeing through phenomenon, the sound isolation property that hides sound structure 1 can see through the frequency decision by sympathetic response, and wherein sympathetic response sees through frequency and determined by the rigidity Ka of the weight M that covers main body 2, air layer 21 and the rigidity K of connecting part 3.Owing on the configuration relation of motor 12 and lid main body 2, can't change the rigidity Ka of air layer 21, therefore as shown in Figure 3,, reduce the rigidity K of connecting part 3 by on lid main body 2, slit 6 being set.Thus, because sympathetic response sees through frequencies go lower, so can under the situation of not gaining in weight, improve the sound isolation property energy that hides sound structure 1.
In addition,, avoid the increase of number of spare parts, therefore can suppress cost and rise by on lid main body 2, slit 6 being set.
In addition, sympathetic response sees through eigentone and the resonance frequency decision of frequency by lid main body 2.When the rigidity that to establish the weight of covering main body 2 be M, establish air layer 21 was Ka, the resonance frequency of lid main body 2 was directly proportional with the square root of Ka/M.When the rigidity that to establish the weight of covering main body 2 be M, establish connecting part 3 was K, the eigentone of lid main body 2 was directly proportional with the square root of K/M.From light-weighted viewpoint, under the situation that alleviates the gravity that covers main body 2, if the rigidity of connecting part 3 remains unchanged, the eigentone and the resonance frequency that then cover main body 2 uprise, and sympathetic response sees through frequency and also uprises, so sound isolation property can worsen.On the other hand, under the situation of weight saving of lid main body 2, if reduce the rigidity of connecting part 3 simultaneously, then can keep low lid main body 2 eigentone, be that sympathetic response sees through frequency, keep or improve the sound isolation property energy that hides sound structure 1.And, if reduce the rigidity of connecting part 3, the eigentone of lid main body 2 is set at below the resonance frequency, then because sympathetic response sees through frequencies go lower, therefore can improve the sound isolation property energy that hides sound structure 1.
In addition, cover main body 2, then cover the rigidity step-down of main body 2, therefore cover emission efficiency (being converted to the efficient of sound from the vibration) step-down of main body 2 if a plurality of planes of combination constitute.Thus, therefore the reduction of radiation again from lid main body 2 can improve the sound isolation property energy that hides sound structure 1.
In addition, by on lid main body 2 a plurality of fine holes 4 being set with 0.1% opening rate, thereby to carrying out sound-absorbing from the sound wave of motor 12 sides by fine holes 4, the emission efficiency that therefore covers main body 2 descends, and reduces from the radiation again of lid main body 2.Thus, can improve the sound isolation property energy that hides sound structure 1.
In addition, the opening rate of the fine holes 4 on the lid main body 2 is so long as get final product below 3%.Be provided with under the situation of the fine holes 4 below a plurality of diameter 3mm on lid main body 2 with the opening rate below 3%, owing to die down by vibrating the power of covering main body 2 extrusion air, so sound isolation property can improve.In addition, be provided with under the situation of the fine holes 4 below a plurality of diameter 1mm on lid main body 2 with the opening rate below 1%, the effect of the attenuation that viscous resistance and dynamic pressure loss cause becomes significantly, so sound isolation property can further improve.In addition, the opening rate about with 0.1% is provided with under the situation of a plurality of fine holes 4, can keep high-frequency sound isolation property energy, reduces the noise that sympathetic response sees through frequency simultaneously.
And, utilize hood 10 with such screening sound structure 1, can fully reduce noise from motor 12.
In addition, if than the spring that is formed by air layer 21 spring that is formed by connecting part 3 is limbered up significantly, then the rigidity of connecting part 3 can not have any impact to the sound isolation property that hides sound structure 1.At this moment, hide the sound isolation property of sound structure 1 can be only by the rigidity decision of air layer 21.
(experimental result)
With the screening sound of present embodiment structure 1 is embodiment, is configured to comparative example with the screening sound of the lid main body of the double weight of the weight of the lid main body 2 that adopts embodiment, makes the rigidity of connecting part identical in embodiment with comparative example, measures the sound isolation property energy respectively.Its result is shown in Fig. 5 (a).The weight of embodiment's lid main body 2 be comparative example the lid main body weight 1/2, if the rigidity of connecting part is identical, then the eigentone of embodiment's lid main body 2 and resonance frequency are than the eigentone and the resonance frequency height of the lid main body of comparative example, and embodiment's sympathetic response sees through frequency and also sees through the frequency height than the sympathetic response of comparative example.Therefore, clear and definite in than the high frequency field of about 315Hz, the sound isolation property of embodiment's screening sound structure 1 can worsen than the sound isolation property of the screening sound structure of the comparative example of Heavy Weight.
Below, screening sound structure 1 with present embodiment is embodiment, screening sound with the lid main body of the double weight of the weight of the lid main body 2 that adopts embodiment is configured to comparative example, and also the rigidity than the connecting part of the screening sound structure of comparative example is low to make embodiment's the rigidity of connecting part 3 of screening sound structure 1, the eigentone of embodiment's lid main body 2 is set at below the resonance frequency, measures the sound isolation property energy respectively.Its result is shown in Fig. 5 (b).The weight of embodiment's lid main body 2 be comparative example the lid main body weight 1/2, and rigidity in the connecting part 3 that reduces embodiment, the eigentone of embodiment's lid main body 2 is set at resonance frequency when following, and embodiment's sympathetic response sees through the frequency sympathetic response that is lower than comparative example that becomes and sees through frequency.Therefore, clear and definite in than the high frequency field of about 400Hz, the sound isolation property of embodiment's screening sound structure 1 can improve than the sound isolation property of the screening sound structure of the comparative example of Heavy Weight.
To sum up, the clear and definite sound isolation property that hides sound structure 1 can see through the frequency decision by sympathetic response, and sympathetic response sees through eigentone and the resonance frequency decision of frequency by lid main body 2, and this sympathetic response sees through frequency step-down when reducing the rigidity of connecting part, it is low more that sympathetic response sees through frequency, and sound isolation property can improve more.
Below, constructing 1 with the screening sound of present embodiment is embodiment, is configured to comparative example with the screening sound that adopts the lid main body that is made of curved surface, measures the sound isolation property energy respectively.Its result as shown in Figure 6.Known than the screening sound structure that constitutes the comparative example that covers main body by curved surface, constructed 1 sound isolation property and can be improved by making up screening sound that a plurality of planes constitute the embodiment of cover main body 2.
Below, with present embodiment, to adopt the screening sound structure 1 that is provided with the lid main body 2 of a plurality of fine holes 4 with 0.1% opening rate be embodiment, is configured to comparative example with the screening sound that adopts the lid main body that fine holes is not set, and measures the sound isolation property energy respectively.Its result as shown in Figure 7.Known at the screening sound that is provided with the embodiment of a plurality of fine holes 4 on the lid main body 2 and constructed 1 for the screening sound structure of the comparative example that is not provided with fine holes on the lid main body, sound isolation property can improve.
[second mode of execution]
Below, in conjunction with Fig. 8 second mode of execution of the present invention is described.The difference of the screening sound structure 1 of screening sound structure 51 and first mode of execution of present embodiment is: four jiaos in lid main body 2 are provided with connecting part 5.
Connecting part 53 has: at the through hole 56 that covers perforation on the main body 2, at a pair of fixed component 54a, the 54b of through hole 56 installations and a pair of elastomer 55a, the 55b that is provided with between a pair of fixed component 54a, 54b.
Be provided with lip part 58a on fixed component 54a, elastomer 55a is connected to lip part 58a.Be provided with lip part 58b on fixed component 54b, elastomer 55b is connected to lip part 58b.In addition, be embedded in the recess 59b that on fixed component 54b, is provided with at the protuberance 59a that is provided with on the fixed component 54a.Insert in a pair of fixed component 54a, 54b and be connected with bolt (secure component) 22, bolt 22 is screwed in the bolt hole 57 that is arranged on the motor 12.By this bolt 22 a pair of fixed component 54a, 54b are fixed on the motor 12.In addition, the secure component that is fastened on the motor 12 is not limited to bolt 22, also can be pin or screw etc.
A pair of elastomer 55a, 55b clamp cover main body 2.In the present embodiment, a pair of elastomer 55a, 55b are helical springs, but are not limited to this.
Lid main body 2 is unfixing with respect to motor 12, and by a pair of elastomer 55a, 55b clamping.So, by with a pair of elastomer 55a, 55b clamp cover main body 2, the rigidity of connecting part 53 reduces.Thus, see through frequencies go lower, therefore can under the situation of not gaining in weight, improve the sound isolation property energy by the sympathetic response of the rigidity decision of the rigidity of lid weight of main body 2 and air layer 21 and connecting part 53.
In addition, in the first embodiment, cover on the main body 2, therefore need the position that the shape of the integral body of main body 2, connecting part 3 and lid main body 2 are covered in consideration to concern the rigidity that designs connecting part 3 because the mounting hole 5 of connecting part 3 is arranged on.With respect to this, in the present embodiment,, therefore when the rigidity of design connecting part 53, need not consider to cover the shape, connecting part 3 of the integral body of main body 2 and the position relation of lid main body 2 because connecting part 53 and lid main body 2 are branch body structures.Therefore, can be according to the spring constant of elastomer 55a, 55b and design the rigidity of connecting part 53 easily.
Other structures are identical with first mode of execution, therefore omit explanation.
[the 3rd mode of execution]
The following describes the 3rd mode of execution of the present invention.Have present embodiment screening sound structure 101 hood (sound-insulation cover) 110 as shown in Figure 9, the part of covering engine 112.Hood 110 also can covering engine 112 whole.Between motor 112 and hood 110, air layer 21 is arranged, hide the sound structure 101 lid main bodys 2 that have and motor 112 by connecting part 53 combinations identical with second mode of execution.And, between the end of covering main body 2 and motor 112, have the gap.
As Figure 10, shown in Figure 11, lid main body 2 combines by the protuberance 112a that connecting part 53 and motor 112 have.And the part of the end 2x of lid main body 2 is towards the direction warpage of motor 112, and the end 2x of warpage contacts with the side 112b face of protuberance 112a.In addition, also can be end 2x whole of covering main body 2, and contact with the side 112b face of protuberance 112a by warpage.
In addition, same with first mode of execution and second mode of execution, lid main body 2 is that a plurality of planes of combination constitute, and the opening rate with 0.1% on lid main body 2 is provided with a plurality of fine holes 4.In addition, the eigentone of lid main body 2 is set to below the resonance frequency that covers main body 2.
Contact with motor 112 (protuberance 112a) face by a part that makes the end 2x that covers main body 2, the end 2x of a part of tegmentum main body 2 in the end 2x of lid main body 2 and the gap of protuberance 112a covers.Thus, suppress therefore, can improve the sound isolation property energy from the end 2x of lid main body 2 and the clearance leakage noise of motor 112.
In addition, be accompanied by motor 112 vibrations, between motor 112 (protuberance 112a) and lid main body 2, produce relative displacement, produce friction in the face contact segment.Thus, vibrational energy is converted to heat energy, and vibration obtains decay, therefore can improve the sound isolation property energy.And the enlarged areas of the end 2x by making the lid main body 2 that contacts with the side 112b of protuberance 112a or dwindle can be controlled the friction-produced amount.
And, also can screening sound as shown in figure 12 to construct 102 like that, part or all warpage of the end 2y by will covering main body 2 is a cross section C word shape, thus part or all of the end 2y of lid main body 2 contacts with the side 112b line of protuberance 112a.At this moment, because therefore the also end 2y covering of tegmentum main body 2 of at least a portion in the gap of the end 2y of lid main body 2 and protuberance 112a suppresses noise from the end 2y of lid main body 2 and the clearance leakage of motor 112.In addition, owing to produce friction by the online contact segment of relative displacement of motor 112 (protuberance 112a) and lid main body 2, so vibrational energy is converted to heat energy, and vibration obtains decaying.Thus, the radiation again from lid main body 2 reduces.
Other structures are identical with second mode of execution, therefore omit its explanation.In addition, also can be to replace connecting part 53 and possess the connecting part 3 of first mode of execution and the structure of slit 6.
(experimental result)
With the screening sound of present embodiment structure 101 is embodiment, to exist the screening sound in gap to be configured to comparative example between the end of lid main body 2 and the motor 112, measures the sound isolation property energy respectively.Its result as shown in figure 13.Known that in the frequency field higher the sound isolation property of embodiment's screening sound structure 101 can be improved than the sound isolation property that the screening sound of comparative example is constructed than 400Hz.This be because, contact with motor 112 by at least a portion that makes the end 2x that covers main body 2, the end 2x of at least a portion tegmentum main body 2 in the end 2x of lid main body 2 and the gap of motor 112 covers, and suppresses noise from the end 2x of lid main body 2 and the clearance leakage of motor 112.
(result of calculation)
Below, screening sound structure 101 with present embodiment is embodiment, a screening sound of/10th of decaying to that causes with the frictions that produce between the end 2x of lid main body 2 and motor 112 with respect to embodiment's screening sound structure 101 is configured to comparative example, calculates the sound isolation property energy respectively.Its result as shown in figure 14.By hood 110 is set, becoming big frequency at noise is under the 1000Hz, and the sound isolation property of clear and definite embodiment's screening sound structure 101 can be improved than the sound isolation property of the screening sound structure of comparative example.This be because, under by the effect that is producing the frictional force that relative displacement is created in contact segment between the end 2x of motor 112 and lid main body 2, the vibration attenuation of lid main body 2 becomes big, than the comparative example vibration by big high attenuation.
[the 4th mode of execution]
The following describes the 4th mode of execution of the present invention.As shown in figure 15, the difference of the screening sound of the screening sound of present embodiment structure the 201 and the 3rd mode of execution structure 101 is: have the metal curtain-shaped cover member 61 that the part to the gap of the end 2x that covers main body 2 and motor 112 covers.In addition, curtain-shaped cover member 61 also can cover the end 2x of lid main body 2 and the whole of gap of motor 112.At this, though not shown, carry out combination by the connecting part 3 of first mode of execution or the 53 pairs of motors in connecting part 112 and the lid main body 2 of second mode of execution.
Curtain-shaped cover member 61 from one distolateral be cross section C word shape to another distolateral warpage, one end of curtain-shaped cover member 61 is incorporated into motor 112 by bolt 62 rigidity, and the other end of curtain-shaped cover member 61 is installed on the protuberance 112a of motor 112 by bolt 63 together with lid main body 2.So, curtain-shaped cover member 61 from one distolateral be cross section C word shape to another distolateral warpage, thereby give curtain-shaped cover member 61 elasticity.
In addition, also can be at helical spring between the head of bolt 63 and the curtain-shaped cover member 61 or between curtain-shaped cover member 61 and lid main body 2, and in this helical spring, insert logical bolt 63.At this moment, can increase the elasticity of curtain-shaped cover member 61.In addition, also can replace bolt 63, carry out combination with the connecting part 3 of first mode of execution or the 53 pairs of motors 112 in connecting part the protuberance 112a that has and the other end of covering main body 2 and curtain-shaped cover member 61 of second mode of execution.
At least a portion of the end 2x of lid main body 2 contacts with the protuberance 112a face of motor 112.Thus, because the end 2x of at least a portion tegmentum main body 2 in the gap of the end 2x of lid main body 2 and motor 112 covers, therefore suppress noise from the end 2x of lid main body 2 and the clearance leakage of motor 112.In addition, by producing friction in the face contact segment, vibrational energy is converted to heat energy, and vibration obtains decay.
In addition, the noise that leaks from the part in the gap of lid end 2x of main body 2 and motor 112 curtain-shaped cover member 61 that is capped this gap suppresses it to external leaks.Thus, can improve the sound isolation property energy.
In addition, because curtain-shaped cover member 61 has elasticity, curtain-shaped cover member 61 performance damping properties.Therefore, be converted to heat energy from the vibrational energy that motor 112 passes to the vibration of covering main body 2, pass to the vibration of covering main body 2 from motor 112 and obtain decay, therefore, suppress to cover the resonance of main body 2 through curtain-shaped cover member 61.Thus, can improve the sound isolation property energy.
In addition, it is 202 such that screening sound is as shown in figure 16 constructed, also can be in the mode of at least a portion in the gap of the end 2x that covers main body 2 and motor 112, will or suppress the curtain-shaped cover member 71 that vibration steel plate etc. constitutes by dual ripple (corrugate) plate and install along the face of lid main body 2 and motor 112 with damping property.At this, at least a portion of the end 2x of lid main body 2 contacts with motor 112 lines, and curtain-shaped cover member 71 and lid main body 2 are combined by the nut 64 that bolt 63 promptly is screwed on the bolt 63.
At this moment, because the also end 2x covering of tegmentum main body 2 of at least a portion in the gap of the end 2x of lid main body 2 and motor 112, so suppress noise from the end 2x of lid main body 2 and the clearance leakage of motor 112.In addition, produce friction by online contact segment, vibrational energy is converted to heat energy, and vibration obtains decay.In addition owing to cover at least a portion in the gap of the end 2x of main body 2 and motor 112 by curtain-shaped cover member 71, so inhibition from the noise of this clearance leakage to external leaks.In addition,, pass to the vibration of covering main body 2 through curtain-shaped cover member 71 from motor 112 and obtain decay, therefore suppress to cover the resonance of main body 2 because curtain-shaped cover member 71 has damping property.
Other structures are identical with the 3rd mode of execution, therefore omit its explanation.
(modified embodiment of the present embodiment)
Embodiments of the present invention more than have been described, but object lesson only is shown, and do not meant that special qualification the present invention, concrete structure etc. can be carried out suitable design alteration.In addition, the effect and the effect of embodiments of the present invention record only exemplify best effect and the effect that the present invention produces, and effect of the present invention and effect are not limited to effect and the effect that embodiment of the present invention is put down in writing.
For example, be that sound-insulation cover is illustrated with hood 10, but sound-insulation cover also can be food tray lid or outlet pipe lid.
In addition, in a sound-insulation cover, also can and construct the screening sound structure 51 of 1 and second mode of execution with the screening sound of first mode of execution.Construct the screening sound of the 101 and the 4th mode of execution for the screening sound of the 3rd mode of execution and construct 201 too.
Claims (9)
1. one kind hides the sound structure, it is characterized in that it has:
The lid main body, it covers at least a portion that noise produces the source across air layer;
The connecting part, described noise is produced the source for it and described lid main body is carried out combination; And
Slit, it is that the center is arranged on the described lid main body with described connecting part.
2. one kind hides the sound structure, it is characterized in that it has:
The lid main body, it covers at least a portion that noise produces the source across air layer; And
The connecting part, described noise is produced the source for it and described lid main body is carried out combination;
Described connecting part has:
Through hole, it is arranged in the mode that runs through described lid main body and covers on the main body;
A pair of fixed component, it is installed in the described through hole, and the secure component that is fastened on the described noise generation source runs through described a pair of fixed component; And
A pair of elastomer, it is arranged between the described a pair of fixed component, and described lid main body is carried out clamping.
3. screening sound structure as claimed in claim 1 or 2 is characterized in that,
At least a portion of the end of described lid main body contacts with described noise generation source, produces at least a portion in the gap in source with end and the described noise that covers described lid main body.
4. as each described screening sound structure in the claim 1～3, it is characterized in that,
Described screening sound structure also has the end of described lid main body and described noise is produced the curtain-shaped cover member that at least a portion in the gap in source covers, one end of described curtain-shaped cover member is installed on described noise and produces the source, and the other end of described curtain-shaped cover member is installed on described lid main body.
5. screening sound structure as claimed in claim 4 is characterized in that,
Described curtain-shaped cover member has damping property.
6. as each described screening sound structure in the claim 1～5, it is characterized in that,
Described lid main body makes up a plurality of planes and constitutes.
7. as each described screening sound structure in the claim 1～6, it is characterized in that,
On described lid main body, be provided with a plurality of fine holes.
8. as each described screening sound structure in the claim 1～7, it is characterized in that,
Be set to below the resonance frequency by the described lid main body of the rigidity decision of the weight of described lid main body and described air layer by the eigentone of the described lid main body of the rigidity decision of the weight of described lid main body and described connecting part.
9. a sound-insulation cover is characterized in that, has each described screening sound structure in the claim 1～8.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010-046098 | 2010-03-03 | ||
| JP2010046098 | 2010-03-03 | ||
| JP2010-233461 | 2010-10-18 | ||
| JP2010233461A JP5566848B2 (en) | 2010-03-03 | 2010-10-18 | Sound insulation structure and sound insulation cover |
Publications (2)
| Publication Number | Publication Date |
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| CN102192010A true CN102192010A (en) | 2011-09-21 |
| CN102192010B CN102192010B (en) | 2013-06-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110043060 Active CN102192010B (en) | 2010-03-03 | 2011-02-21 | Sound shielding structure and sound shielding cover |
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| Country | Link |
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| CN (1) | CN102192010B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102689748A (en) * | 2012-06-14 | 2012-09-26 | 昆山维金五金制品有限公司 | Upper cover structure of component |
| CN114483302A (en) * | 2021-12-31 | 2022-05-13 | 盐城工学院 | Active control method and device for automobile noise |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1054256A (en) * | 1996-08-12 | 1998-02-24 | Mitsubishi Motors Corp | Sound isolation cover |
| US20020134600A1 (en) * | 2001-03-22 | 2002-09-26 | Tokai Rubber Industries, Ltd. | Sound proofing cover for vehicle |
| JP3399427B2 (en) * | 1996-10-02 | 2003-04-21 | 国産部品工業株式会社 | Sound insulation cover |
| EP1528231A1 (en) * | 2003-10-29 | 2005-05-04 | Nichias Corporation | Vibration proofing heat shield plate |
| CN1637242A (en) * | 2003-12-25 | 2005-07-13 | 三和密封件工业有限公司 | Vibration damping mount and metal heat shield |
| CN200993070Y (en) * | 2006-11-23 | 2007-12-19 | 广西玉柴机器股份有限公司 | Fuel injection pump drive shaft sound-isolating cover |
| CN101131121A (en) * | 2006-08-25 | 2008-02-27 | 本田技研工业株式会社 | Engine-driven work machine |
| WO2009089242A2 (en) * | 2008-01-07 | 2009-07-16 | Federal-Mogul Corporation | Vehicle engine and snap-on engine cover assembly therefor and method of assembly of the cover assembly to the engine |
-
2011
- 2011-02-21 CN CN 201110043060 patent/CN102192010B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1054256A (en) * | 1996-08-12 | 1998-02-24 | Mitsubishi Motors Corp | Sound isolation cover |
| JP3399427B2 (en) * | 1996-10-02 | 2003-04-21 | 国産部品工業株式会社 | Sound insulation cover |
| US20020134600A1 (en) * | 2001-03-22 | 2002-09-26 | Tokai Rubber Industries, Ltd. | Sound proofing cover for vehicle |
| EP1528231A1 (en) * | 2003-10-29 | 2005-05-04 | Nichias Corporation | Vibration proofing heat shield plate |
| CN1637242A (en) * | 2003-12-25 | 2005-07-13 | 三和密封件工业有限公司 | Vibration damping mount and metal heat shield |
| CN101131121A (en) * | 2006-08-25 | 2008-02-27 | 本田技研工业株式会社 | Engine-driven work machine |
| CN200993070Y (en) * | 2006-11-23 | 2007-12-19 | 广西玉柴机器股份有限公司 | Fuel injection pump drive shaft sound-isolating cover |
| WO2009089242A2 (en) * | 2008-01-07 | 2009-07-16 | Federal-Mogul Corporation | Vehicle engine and snap-on engine cover assembly therefor and method of assembly of the cover assembly to the engine |
Non-Patent Citations (1)
| Title |
|---|
| 王栋等: "《开孔对矩形板动力性能影响分析》", 《噪声与振动控制》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102689748A (en) * | 2012-06-14 | 2012-09-26 | 昆山维金五金制品有限公司 | Upper cover structure of component |
| CN114483302A (en) * | 2021-12-31 | 2022-05-13 | 盐城工学院 | Active control method and device for automobile noise |
| CN114483302B (en) * | 2021-12-31 | 2022-11-22 | 盐城工学院 | Active control device for automobile noise |
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| Publication number | Publication date |
|---|---|
| CN102192010B (en) | 2013-06-19 |
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