CN102192010B - Sound shielding structure and sound shielding cover - Google Patents
Sound shielding structure and sound shielding cover Download PDFInfo
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- CN102192010B CN102192010B CN 201110043060 CN201110043060A CN102192010B CN 102192010 B CN102192010 B CN 102192010B CN 201110043060 CN201110043060 CN 201110043060 CN 201110043060 A CN201110043060 A CN 201110043060A CN 102192010 B CN102192010 B CN 102192010B
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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 theweight 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 at automobile the noise producing such as motor, outlet pipe source near 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 near the noise producing source sound-insulation cover of screening sound.
Patent documentation 1 discloses that a kind of screening is hot, the sound isolation property lid, it is with the two layers of surface plate and be clipped in therebetween attraction material layer and be formed separately as the plane shape of regulation and carry out stackedly, will be the shape of lid at the roughly whole stacked shaping plate forming of return portion that is formed with of the peripheral portion of plywood.
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, form the recess of the head of the external screw can accommodate to install food tray on the foaming body of the internal surface that is formed at opposed flange, 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 Unexamined Patent 11-350970 communique
Patent documentation 2:JP JP 2004-278446 communique
But, in the situation that the noise producing source near sound-insulation cover is set, can produce sound-insulation cover and see through phenomenon with the sympathetic response of a certain characteristic frequency resonance.Sympathetic response sees through frequency (sympathetic response sees through frequency) that phenomenon produces and is determined by the rigidity (spring constant when work as spring in the connecting part) of the connecting part of the rigidity (spring constant when air layer works as spring) of the air layer between weight, noise producing source and the sound-insulation cover of sound-insulation cover and noise producing 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.
For this problem, the countermeasure that adopts at present is to insert to attract material between noise producing source and sound-insulation cover, 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 in the situation that screening sound structure and the sound-insulation cover of not gaining in weight and 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 in noise producing source across air layer;
The connecting part, it carries out combination to described noise producing source and described lid main body; And
Slit, it is arranged on centered by described connecting part on described lid main body.
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 frequency by sympathetic response and determine, sympathetic response sees through frequency by weight and the rigidity of air layer and the rigidity decision of connecting part of lid main body, but from the configuration relation of noise producing source and lid main body, due to the rigidity that can't change air layer, so on the lid main body, slit is set, reduce the rigidity of connecting part.Thus, reduce because sympathetic response sees through frequency, therefore can improve the sound isolation property energy in the situation that do not gain in weight.In addition, by on the lid main body, slit being set, can avoid the increase of number of spare parts, therefore can suppress cost and rise.In addition, the rigidity of so-called air layer refers to the spring constant during as spring action at air layer, the spring constant the when rigidity of so-called connecting part refers 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 in noise producing source across air layer; And
The connecting part, it carries out combination to described noise producing source and described lid main body;
Described connecting part has:
Through hole, it is arranged in the mode that runs through described lid main body and covers on main body;
A pair of fixed component, it is arranged in described through hole, and the secure component that is fastened on described noise producing source runs through described a pair of fixed component; And
A pair of elastomer, it is arranged between 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 frequency by sympathetic response and determine, sympathetic response sees through frequency by weight and the rigidity of air layer and the rigidity decision of connecting part of lid main body, but from the configuration relation of noise producing source and lid main body, due to the rigidity that can't change air layer, so by with a pair of elastomer clamp cover main body, reduce the rigidity of connecting part.Thus, reduce because sympathetic response sees through frequency, therefore can improve the sound isolation property energy in the situation that do not gain in weight.In addition, be Split type structure owing to covering main body and connecting part, therefore can easily design based on elastomeric spring constant the rigidity of connecting part.
In addition in screening sound of the present invention structure, can be also that at least a portion of the end of described lid main body contacts with described noise producing source, with at least a portion in the gap in the end that covers described lid main body and described noise producing source.According to said structure, at least a portion by making the end of covering main body contacts with the noise producing source, thereby the end of at least a portion tegmentum main body in the end of lid main body and the gap in noise producing source covers, and therefore, suppresses noise from the clearance leakage in the end of lid main body and noise producing source.In addition, be accompanied by the vibration in noise producing source, produce Relative Displacement in noise producing source and lid between main body, produce friction in contact segment, so vibrational energy is converted to heat energy, vibration is decayed.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 the noise producing source or dwindle can be controlled the friction production.
In addition, in screening sound structure of the present invention, can be also that described screening sound structure also has the curtain-shaped cover member that at least a portion to the gap in the end of described lid main body and described noise producing source covers, one end of described curtain-shaped cover member is installed on described noise producing source, and the other end of described curtain-shaped cover member is installed on described lid main body.According to said structure, therefore at least a portion due to the gap in the end of covering main body with curtain-shaped cover member and noise producing source suppresses to leak to the outside from the noise of this clearance leakage.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, by the damping property (damping) that curtain-shaped cover member has, make through curtain-shaped cover member and pass to the vibration attenuation of covering main body from the noise producing source, therefore, suppress 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 consist of.According to said structure, than lid main body situation about being consisted of by curved surface, make up a plurality of planes and consist of and cover main body and more make the rigidity reduction of covering main body, therefore, cover emission efficiency (being transformed to the efficient of sound from the vibration) step-down of main body.Thus, because the radiation again from the lid main body reduces, can improve the sound isolation property energy.
In addition, in screening sound structure of the present invention, can be provided with a plurality of fine holes on described lid main body.According to this structure, when when lid is provided with a plurality of fine holes on main body, at the attenuation that produces attenuation that viscous resistance causes and dynamic pressure loss by the air in the air layer of fine holes and cause, 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, keep the sound isolation property energy to high frequency, can reduce the noise that sympathetic response sees through frequency simultaneously.
In addition, in screening sound of the present invention structure, the eigentone of the described lid main body that is determined by the rigidity of the weight of described lid main body and described connecting part is set to below the resonance frequency of the described lid main body that the rigidity by the weight of described lid main body and described air layer determines.According to said structure, sympathetic response sees through frequency by eigentone and the resonance frequency decision of lid main body, but from light-weighted viewpoint, in the situation that alleviate the weight of covering main body, if the rigidity of connecting part remains unchanged, the eigentone and the resonance frequency that cover main body uprise, and sympathetic response sees through frequency and also uprises, so sound isolation property can worsen.On the other hand, in the situation that alleviate the weight of covering main body, if the rigidity of connecting part also reduces together, 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 as below resonance frequency, because seeing through frequency, sympathetic response reduces, therefore can improve the sound isolation property energy.
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 from the noise producing source.
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 in the situation that do not gain in weight.
Description of drawings
Fig. 1 means the summary side elevation of vehicle;
Fig. 2 is the skeleton diagram of hood;
Fig. 3 is the approximate vertical view of connecting part periphery;
Fig. 4 means the figure of equivalence model;
Fig. 5 means the coordinate diagram of the relation of frequency and sound isolation property energy;
Fig. 6 means the coordinate diagram of the relation of frequency and sound isolation property energy;
Fig. 7 means the coordinate diagram of the relation of 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 means the coordinate diagram of the relation of frequency and sound isolation property energy;
Figure 14 means the coordinate diagram of the relation of 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;
In 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 the preferred embodiment of the present invention.
[the 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.Be provided with motor 12 on vehicle 11, 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 is above air layer 21 covers as the motor 12 in noise producing source, and 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 consists of by making up 21 plane 2a～2u.Be positioned at plane 2r, 2s, 2t, the 2u of four jiaos that cover 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 consisted of by curved surface, make up a plurality of planes and consist of and more reduce the rigidity of cover main body 2, shorten at the wavelength of the Qu Bo of lid main body 2 interior propagation, therefore, cover emission efficiency (being transformed to the efficient of sound from the vibration) step-down of 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 air layer 21 has is converted to heat energy, and air vibration is decayed, and 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 air layer 21 has is converted to heat energy, and air vibration is decayed, and therefore passes through the sound wave of fine holes 4 by sound-absorbing.
A section enlarged view as Fig. 2 is namely 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 the engagement portions (not shown) such as the fastening bolt of motor 12 or pin.In addition, hide sound structure 1 centered by connecting part 3, have the slit 6 that arranges on lid main body 2.In addition, motor 12 and lid main body 2 also can not used the secure component such as bolt and combination.At this moment, do not need mounting hole 5.
As shown in Fig. 3 (a), four slits 6 can be set on the same circumference centered by connecting part 3, as shown in Fig. 3 (b), also can on two different circumference centered by connecting part 3, four slits 6 be set respectively, as shown in Fig. 3 (c), also can centered by connecting part 3, slit 6 be arranged to vortex shape.In addition, as shown in Fig. 3 (d), the slit 6 of two straight line shapies can be set in the mode that clips connecting part 3, as shown in Fig. 3 (e), also two slits 6 can be set according to the shape that the circular arc centered by connecting part 3 and straight line combine.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, as shown in Fig. 4 (a), if connecting part 3 and air layer 21 between motor 12 and lid main body 2 are considered as respectively spring, as shown in Fig. 4 (b), can represent with the equivalence model of the spring arranged side by side 31 of the equivalent mass 32 that adopted lid main body 2 and connecting part 3 and air layer 21.
In Fig. 4 (a), when producing noise from motor 12, produce in connection with section 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 to the square root of (Ka+K)/M.See through phenomenon by sympathetic response and pass to the vibration of covering main body 2 and radiated from lid main body 2 again, the sound isolation property that therefore hides sound structure 1 can worsen.
In addition, as shown in Fig. 4 (a), vibration 3 passes to from motor 12 and covers main body 2 through the connecting part.Pass to the vibration of covering main body 2 owing to being 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 frequency by sympathetic response and determine, wherein sympathetic response sees through frequency by the rigidity Ka of the weight M that covers main body 2, air layer 21 and the rigidity K decision of connecting part 3.Due 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, by on lid main body 2, slit 6 being set, reduce the rigidity K of connecting part 3.Thus, because sympathetic response sees through frequencies go lower, so can in the situation that do not gain in weight, improve the sound isolation property energy that hides sound structure 1.
In addition, by on lid main body 2, slit 6 being set, avoid the increase of number of spare parts, therefore can suppress cost and rise.
In addition, sympathetic response sees through frequency by eigentone and the resonance frequency decision of 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 to 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 to the square root of K/M.From light-weighted viewpoint, in the situation that alleviate the gravity that covers main body 2, if the rigidity of connecting part 3 remains unchanged, the eigentone and the resonance frequency that cover main body 2 uprise, and sympathetic response sees through frequency and also uprises, so sound isolation property can worsen.On the other hand, in the situation that the weight saving of lid main body 2, if reduce simultaneously the rigidity of connecting part 3, 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 covering main body 2 is set as below resonance frequency, 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 if make up a plurality of planes formation, 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.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 the sound wave by fine holes 4 carries out sound-absorbing from motor 12 sides, 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 lid main body 2 is so long as get final product below 3%.With the opening rate below 3% in the situation that lid is provided with the fine holes 4 below a plurality of diameter 3mm on main body 2, because the power of covering main body 2 extrusion air by vibration dies down, so sound isolation property can improve.In addition, with the opening rate below 1% in the situation that lid is provided with the fine holes 4 below a plurality of diameter 1mm on main body 2, the effect of the attenuation that viscous resistance and dynamic pressure loss cause becomes significantly, so sound isolation property can further improve.In addition, in the situation that be provided with a plurality of fine holes 4 with the opening rate of 0.1% left and right, can keep high-frequency sound isolation property energy, reduce simultaneously the noise that sympathetic response sees through frequency.
And, utilize the hood 10 with such screening sound structure 1, can fully reduce the noise from motor 12.
In addition, if than the spring that is formed by air layer 21, the spring that is formed by connecting part 3 is limbered up significantly, the rigidity of connecting part 3 can not have any impact to the sound isolation property that hides sound structure 1.At this moment, hiding the sound isolation property of sound structure 1 can be only be determined by the rigidity of air layer 21.
(experimental result)
Take the screening sound of present embodiment structure 1 as embodiment, be 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, the rigid phase that makes the connecting part at embodiment and comparative example with, measure respectively the sound isolation property energy.Its result is as 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 rigid phase of connecting part is same, the eigentone of embodiment's lid main body 2 and resonance frequency are higher than eigentone and the resonance frequency of the lid main body of comparative example, and it is also high through frequency than the sympathetic response of comparative example that embodiment's sympathetic response sees through frequency.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, construct 1 as embodiment take the screening sound of present 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 as below resonance frequency, measures respectively the sound isolation property energy.Its result is as 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 the rigidity in the connecting part 3 that reduces embodiment, the eigentone of embodiment's lid main body 2 is set as resonance frequency when following, and embodiment's sympathetic response sees through the sympathetic response that frequency becomes lower than comparative example 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 frequency by sympathetic response and determine, sympathetic response sees through frequency and determined by eigentone and the resonance frequency of lid main body 2, and this sympathetic response sees through frequency step-down when reducing the rigidity of connecting part, it is lower that sympathetic response sees through frequency, and sound isolation property can more improve.
Below, construct 1 as embodiment take the screening sound of present embodiment, be configured to comparative example with the screening sound that adopts the lid main body that is consisted of by curved surface, measure respectively the sound isolation property energy.Its result as shown in Figure 6.Known than the screening sound structure that is consisted of 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 consist of the embodiment of cover main body 2.
Below, with present embodiment, adopt the screening sound structure 1 of lid main body 2 that is provided with a plurality of fine holes 4 take 0.1% opening rate as embodiment, be configured to comparative example with the screening sound that adopts the lid main body that fine holes is not set, measure respectively the sound isolation property energy.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 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.
[the second mode of execution]
Below, in conjunction with Fig. 8, the 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 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 arranges 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 at the protuberance 59a that arranges on fixed component 54a the recess 59b that arranges on fixed component 54b.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 motor 12.By this bolt 22, a pair of fixed component 54a, 54b are fixed on motor 12.In addition, the secure component that is fastened on motor 12 is not limited to bolt 22, can be also 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, the sympathetic response that is determined by the rigidity of the rigidity of the lid weight of main body 2 and air layer 21 and connecting part 53 sees through frequencies go lower, therefore can improve the sound isolation property energy in the situation that do not gain in weight.
In addition, in the first embodiment, cover on main body 2 because the mounting hole 5 of connecting part 3 is arranged on, the shape, connecting part 3 that therefore needs to consider cover the integral body of main body 2 and the position relationship that covers main body 2 design the rigidity of connecting part 3.With respect to this, in the present embodiment, because connecting part 53 and lid main body 2 are Split type structures, therefore when the rigidity of design connecting part 53, need not consider to cover the position relationship of shape, connecting part 3 with the lid main body 2 of the integral body of main body 2.Therefore, can be according to the spring constant of elastomer 55a, 55b and easily design the rigidity of connecting part 53.
Other structures are identical with the first mode of execution, and therefore description thereof is omitted.
[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 with motor 112 by connecting part 53 combinations identical with the second mode of execution.And, have the gap between the end of covering main body 2 and motor 112.
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, can be also end 2x whole in warpage of covering main body 2, and contact with the side 112b face of protuberance 112a.
In addition, same with the first mode of execution and the second mode of execution, lid main body 2 is to make up a plurality of planes to consist of, 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, produce Relative Displacement between motor 112 (protuberance 112a) and lid main body 2, produce friction in the face contact segment.Thus, vibrational energy is converted to heat energy, and vibration is decayed, and 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 production.
And screening sound structure 102 that also can be as shown in figure 12 is such, and part or all warpage of the end 2y by will cover main body 2 is cross section C word shape, thereby part or all of end 2y that covers main body 2 contacts with the side 112b line of protuberance 112a.At this moment, because at least a portion in the gap of the lid end 2y of main body 2 and the protuberance 112a also end 2y of tegmentum main body 2 covers, therefore suppress noise from the end 2y of lid main body 2 and the clearance leakage of motor 112.In addition, because the online contact segment of Relative Displacement by motor 112 (protuberance 112a) and lid main body 2 produces friction, so vibrational energy is converted to heat energy, vibrates and decayed.Thus, the radiation again from lid main body 2 reduces.
Other structures are identical with the second mode of execution, and therefore the description thereof will be omitted.In addition, can be also to replace connecting part 53 and possess the connecting part 3 of the first mode of execution and the structure of slit 6.
(experimental result)
Take the screening sound of present embodiment structure 101 as embodiment, to exist the screening sound in gap to be configured to comparative example between the end of lid main body 2 and motor 112, measure respectively the sound isolation property energy.Its result as shown in figure 13.Known in the frequency field higher than 400Hz, 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.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, construct 101 as embodiment take the screening sound of present 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 respectively the sound isolation property energy.Its result as shown in figure 14.By hood 110 is set, becoming large frequency at noise is under 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, be created under the effect of frictional force of contact segment by producing Relative Displacement between the end 2x of motor 112 and lid main body 2, the vibration attenuation of lid main body 2 becomes large, than the comparative example vibration by large 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 the first mode of execution or 53 pairs of connecting parts motor 112 and the lid main body 2 of the 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 arranged 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 curtain-shaped cover member 61 or between curtain-shaped cover member 61 and lid main body 2, and insert logical bolt 63 in this helical spring.At this moment, can increase the elasticity of curtain-shaped cover member 61.In addition, also can replace bolt 63, combination is carried out in the protuberance 112a that has with 53 pairs of the connecting parts motor 112 of the connecting part 3 of the first mode of execution or the second mode of execution and the other end of lid main body 2 and curtain-shaped cover member 61.
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 lid end 2x of 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 is decayed.
The curtain-shaped cover member 61 in noise capped this gap of leaking from the part in the gap of the lid end 2x of main body 2 and motor 112 in addition, suppresses it and leaks to the outside.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 through curtain-shaped cover member 61 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 decayed, therefore, suppress to cover the resonance of main body 2.Thus, can improve the sound isolation property energy.
In addition, screening sound structure 202 as shown in figure 16 is such, 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 by dual ripple (corrugate) plate with damping property the curtain-shaped cover member 71 that vibration steel plate etc. consists of and install along the face of lid main body 2 and motor 112.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 namely is screwed on bolt 63.
At this moment, because at least a portion in the gap of the lid end 2x of main body 2 and the motor 112 also end 2x of tegmentum main body 2 covers, 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 is decayed.In addition, owing to covering 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 is leaked to the outside from the noise of this clearance leakage.In addition, because curtain-shaped cover member 71 has damping property, pass to the vibration of covering main body 2 through curtain-shaped cover member 71 from motor 112 and decayed, therefore suppress to cover the resonance of main body 2.
Other structures are identical with the 3rd mode of execution, and therefore the description thereof will be omitted.
(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 and be particularly limited the present invention, concrete structure etc. can be carried out suitable design alteration.In addition, 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 illustrated take hood 10 as sound-insulation cover, but sound-insulation cover can be also food tray lid or outlet pipe lid.
In addition, in a sound-insulation cover, also may be used the screening sound structure 51 of screening sound structure 1 and second mode of execution of the 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 (8)
1. one kind hides the sound structure, it is characterized in that, it has:
The lid main body, it covers at least a portion in noise producing source across air layer;
The connecting part, it carries out combination to described noise producing source and described lid main body; And
Slit, it is arranged on centered by described connecting part on described lid main body,
The eigentone of described lid main body is set to below the resonance frequency of described lid main body, the eigentone of wherein said lid main body is by the weight of described lid main body and the rigidity decision of described connecting part, and the resonance frequency of described lid main body is determined by the weight of described lid main body and the rigidity of described air layer.
2. one kind hides the sound structure, it is characterized in that, it has:
The lid main body, it covers at least a portion in noise producing source across air layer; And
The connecting part, it carries out combination to described noise producing source and described lid main body;
Described connecting part has:
Through hole, it is arranged in the mode that runs through described lid main body and covers on main body;
A pair of fixed component, it is arranged in described through hole, and the secure component that is fastened on described noise producing source runs through described a pair of fixed component; And
A pair of elastomer, it is arranged between described a pair of fixed component, and described lid main body is carried out clamping,
The eigentone of described lid main body is set to below the resonance frequency of described lid main body, the eigentone of wherein said lid main body is by the weight of described lid main body and the rigidity decision of described connecting part, and the resonance frequency of described lid main body is determined by the weight of described lid main body and the rigidity of described air layer.
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 producing source, with at least a portion in the gap in the end that covers described lid main body and described noise producing source.
4. screening sound structure as claimed in claim 1, is characterized in that,
Described screening sound structure also has the curtain-shaped cover member that at least a portion to the gap in the end of described lid main body and described noise producing source covers, one end of described curtain-shaped cover member is installed on described noise producing 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. screening sound structure as claimed in claim 1, is characterized in that,
Described lid main body makes up a plurality of planes and consists of.
7. screening sound structure as claimed in claim 1, is characterized in that,
Be provided with a plurality of fine holes on described lid main body.
8. a sound-insulation cover, is characterized in that, has the described screening sound structure of any one in claim 1～7.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010-046098 | 2010-03-03 | ||
| JP2010046098 | 2010-03-03 | ||
| JP2010233461A JP5566848B2 (en) | 2010-03-03 | 2010-10-18 | Sound insulation structure and sound insulation cover |
| JP2010-233461 | 2010-10-18 |
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| Publication Number | Publication Date |
|---|---|
| CN102192010A CN102192010A (en) | 2011-09-21 |
| CN102192010B true 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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| CN (1) | CN102192010B (en) |
Families Citing this family (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 |
| CN114483302B (en) * | 2021-12-31 | 2022-11-22 | 盐城工学院 | Active control device for automobile noise |
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| CN102192010A (en) | 2011-09-21 |
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