CN113682090A - Tire noise reduction system - Google Patents
Tire noise reduction system Download PDFInfo
- Publication number
- CN113682090A CN113682090A CN202110497711.4A CN202110497711A CN113682090A CN 113682090 A CN113682090 A CN 113682090A CN 202110497711 A CN202110497711 A CN 202110497711A CN 113682090 A CN113682090 A CN 113682090A
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- China
- Prior art keywords
- tire
- sound
- absorbing cotton
- strip
- cavity
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C19/00—Tyre parts or constructions not otherwise provided for
- B60C19/002—Noise damping elements provided in the tyre structure or attached thereto, e.g. in the tyre interior
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/0681—Parts of pneumatic tyres; accessories, auxiliary operations
- B29D30/0685—Incorporating auto-repairing or self-sealing arrangements or agents on or into tyres
Abstract
The application relates to the technical field of tire manufacturing, in particular to a tire noise reduction system. A tire noise reduction system comprises a pneumatic tire with a cavity, wherein the pneumatic tire is provided with a tread portion, a bead portion and a sidewall portion, the inner wall of the tread portion is provided with strip-shaped sound-absorbing cotton in a bonding mode through an adhesive, the strip-shaped sound-absorbing cotton is provided with more than one continuous annular hole along the circumferential direction, the strip-shaped sound-absorbing cotton is connected end to end, and the annular holes are also connected end to form an annular large noise-absorbing cavity which is not communicated with the inner cavity of the tire; the strip-shaped sound-absorbing cotton is a spongy porous material prepared by foaming a high polymer material, and the apparent density of the spongy porous material is 5kg/m3‑50kg/m3The side wall of the annular hole is communicated with the multiple holes of the strip-shaped sound-absorbing cotton, so that the annular large silencing cavity is communicated with the multiple porous silencing cavities. The implementation of the invention finds that the large main body silencing cavity can be matched with countless small silencing cavities to suppress cavity noise in a wider frequency range.
Description
Technical Field
The application relates to the technical field of tire manufacturing, in particular to a tire noise reduction system.
Background
The noise generated when the tire is running is generally composed of external noise such as pattern noise and road noise, and internal cavity noise. Tire cavity noise is excited by road surface input and is caused by the resonance of the ultra low pressure acoustic system consisting of tires and disc wheels, and is also commonly referred to as tire resonance.
The cavity noise frequency is between 200 Hz and 300Hz, and is determined by the structure of the tire cavity.
Attaching a silencer made of a spongy material in a cavity inside a tire is a known method of reducing the noise of the cavity. The sponge sound-absorbing cotton is used as the action mechanism of the silencer, and the sound-absorbing cotton is internally provided with a plurality of micropores formed by air, so that sound waves can be buffered and absorbed, and the sound waves are difficult to reflect on the plane of the sound-absorbing cotton. Therefore, in the prior patent, the density of the sound absorption cotton is strictly regulated, and as the density of the sound absorption cotton is regulated in patent CN110395976A, the density of the sound absorption cotton needs to be between 40g/m3 and 50kg/m3, or the effective effect cannot be achieved. However, the method still has a larger improvement on the reduction degree of the cavity noise. Because the frequency of the cavity noise is between 200-300Hz, and the pore diameter of the polyurethane used as the sound absorbing cotton material is generally fixed after foaming, it is difficult to eliminate the sound wave in the whole frequency range.
The Chinese patent application (publication No. CN110733298A Kokai: 20200131) discloses a tire noise reduction device, which is mainly characterized in that a noise reduction structure is arranged on the inner surface of a tire cavity in a tire, the noise reduction structure is provided with at least one sound absorption material, the sound absorption material penetrates through the tire cavity to form a hollow air chamber, the sound absorption material comprises a binding surface which is stuck on the inner surface of the tire and a through surface, and a channel is arranged on the through surface and is used for communicating the air chamber and facing the center of the tire; because the sound-absorbing material is provided with the air chamber, the sound waves generate energy to offset and attenuate, and the tire cavity resonance sound is effectively reduced. However, in the through passage of the communicating air chamber in the patent, reflection and superposition of sound waves are formed, and the sound attenuation effect is weakened. Thus, the structure is still more space-optimized for noise reduction.
Disclosure of Invention
In order to solve the above technical problems, the present application aims to provide a tire noise reduction system, which designs more than one cylindrical hole which is larger and is not communicated with the inner cavity of a tire as a main body noise reduction cavity inside sound absorption cotton; secondly, the specific gravity of the sound absorption cotton material is increased, namely the volume of countless small sound absorption cavities is reduced. The implementation of the invention finds that the large main body silencing cavity can be matched with countless small silencing cavities to suppress cavity noise in a wider frequency range.
In order to achieve the above object, the present application adopts the following technical solutions:
a tire noise reduction system comprises a pneumatic tire with a cavity, wherein the pneumatic tire is provided with a tread part, a bead part and a sidewall part, and the inner wall of the tread part is provided with strip-shaped sound-absorbing cotton through adhesive bonding; the strip-shaped sound-absorbing cotton is a spongy porous material prepared by foaming a high polymer material, and the apparent density of the spongy porous material is 5kg/m3-50kg/m3The side wall of the annular hole is communicated with the multiple holes of the strip-shaped sound-absorbing cotton, so that the annular large silencing cavity is communicated with the multiple porous silencing cavities.
Preferably, a line connecting the center of gravity of the annular hole and the center of the tire tread is perpendicular to a center auxiliary line where the section width of the tire is located. The arrangement of the center of gravity can help the dynamic balance adjustment of the tire.
Preferably, the cross section of the annular hole accounts for 10-40% of the normal cross section area of the strip-shaped sound-absorbing cotton, and the apparent density of the strip-shaped sound-absorbing cotton is 5kg/m3-20kg/m3。
Preferably, the right section of the annular hole is circular, square, regular triangle, regular pentagon, regular hexagon or pentagon. Of course, the annular ring of the present application may also include a variety of cross-sections, including irregular shapes, non-equilateral polygons, and the like.
Preferably, the radius of the circumscribed circle of the right section of the annular hole is Rs, and the thickness Hs of the sound-absorbing cotton is more than or equal to 2mm and less than or equal to 0.5Hs-1 mm. If Rs is less than 2mm, the volume of the whole main silencing cavity is insufficient, and the inhibition effect of the main silencing cavity on the noise of the cavity is weakened; if Rs is more than 0.5Hs-1mm, the volume of the whole sound-absorbing cotton material is reduced, the number of small cavities is insufficient, and the effect of inhibiting the noise of the cavities is also weakened.
Preferably, the height of the tire cavity is Hc, and the thickness Hs of the sound-absorbing cotton is more than or equal to 5mm and less than or equal to 0.8 Hc. If Hs is less than 20mm, the number of small silencing cavities in the sound-absorbing cotton is insufficient, and the effect of reducing the noise of the cavity cannot be achieved; if Hs > 0.8Hc, the weight of the whole sound-absorbing cotton becomes large, which not only increases the weight of the tire, but also increases the possibility of falling off from the inner wall of the tire during running.
Preferably, the strip-shaped sound absorbing cotton has a square or isosceles trapezoid cross section.
Preferably, the polymer material is one of low-density polyether, polyurethane and polyester. Most preferably a polyurethane metamaterial.
Preferably, the adhesive is a self-repairing sizing coating with the functions of puncture resistance, repair avoidance and sound absorption cotton adhesion, the width of the self-repairing sizing coating is 50% -130% of the width of the tread, and the thickness of the self-repairing sizing coating is 0.5-3.5 mm. The self-repairing rubber coating that this application adopted has good adhesion performance, can inhale the sound cotton firm absorption in tire internal surface with the banding, and the self-repairing rubber coating of this application contains the self-repairing composition in addition, and when the tire was punctureed, the self-repairing composition can permeate into the gas leakage position fast, blocks up and restores the gas leakage hole with the gas leakage hole.
Preferably, the width of the self-repairing sizing material coating is 100% -200% of the width of the contact surface of the self-repairing sizing material coating and the sound-absorbing cotton, and the soaking depth of the self-repairing sizing material coating soaked in the sound-absorbing cotton is 1-3 mm.
By adopting the technical scheme, more than one cylindrical hole which is larger and is not communicated with the inner cavity of the tire is designed in the sound-absorbing cotton of the system to serve as a main body sound-absorbing cavity; secondly, the specific gravity of the sound absorption cotton material is increased, namely the volume of countless small sound absorption cavities is reduced. The implementation of the invention finds that the large main body silencing cavity can be matched with countless small silencing cavities to suppress cavity noise in a wider frequency range.
Drawings
Fig. 1 is a schematic structural diagram of the present application.
Detailed Description
The following describes a detailed embodiment of the present invention with reference to the accompanying drawings.
A tire noise reduction system as shown in FIG. 1 comprises a pneumatic tire having a cavity, the pneumatic tire having a tread portion 1, a bead portion 3, and a sidewall portion 2, wherein a strip-shaped sound-absorbing cotton 4 is bonded to the inner wall of the tread portion 1 by an adhesive 5, the strip-shaped sound-absorbing cotton 4 is a sponge-shaped porous material made of polyurethane foam, and the apparent density of the strip-shaped sound-absorbing cotton 4 is 5kg/m3-20kg/m3The height of the square tire cavity of the strip-shaped sound-absorbing cotton 4 is Hc, and the thickness Hs of the sound-absorbing cotton is not less than 5mm and not more than 0.8 Hc. The strip-shaped sound-absorbing cotton 4 is provided with a continuous annular hole 6 along the circumferential direction, the right section of the annular hole 6 is circular, the section of the annular hole accounts for 10-40% of the area of the right section of the strip-shaped sound-absorbing cotton, the radius of the circle is Rs, and the thickness Hs of the sound-absorbing cotton is not less than 2mm and not more than 0.5Hs-1 mm. The connecting line of the center of gravity of the annular hole 6 and the center of the tire tread is vertical to the center auxiliary line of the section width of the tire. The strip-shaped sound-absorbing cotton 4 is connected end to end, and the annular hole 6 is also connected end to form an annular main sound-absorbing cavity which is not communicated with the inner cavity of the tire; the side wall of the annular hole 6 is communicated with the plurality of holes of the strip-shaped sound absorption cotton 4, so that the annular main silencing cavity is communicated with a plurality of porous silencing cavities.
The adhesive 5 is a self-repairing sizing material coating with the functions of puncture resistance, repair avoidance and sound absorption cotton adhesion, the width of the self-repairing sizing material coating is set to be 50% -130% of the width of the tire tread, and the thickness of the self-repairing sizing material coating is 0.5-3.5 mm. The width of the self-repairing sizing material coating is set to be 100% -200% of the width of the contact surface of the self-repairing sizing material coating and the sound-absorbing cotton, and the soaking depth of the self-repairing sizing material coating soaked in the sound-absorbing cotton is set to be 1-3 mm. The self-repairing rubber coating that this application adopted has good adhesion performance, can inhale the sound cotton firm absorption in tire internal surface with the banding, and the self-repairing rubber coating of this application contains the self-repairing composition in addition, and when the tire was punctureed, the self-repairing composition can permeate into the gas leakage position fast, blocks up and restores the gas leakage hole with the gas leakage hole.
Taking the tire of 205/55R16 specification as an embodiment, all the formulas, materials and structural designs of the tire are the same, and only the material density, the radius Rs of the cylindrical sound-absorbing cavity and the thickness Hs of the sound-absorbing cotton are changed. The cavity height for this specification is 60 mm. Wherein: examples 1-3 and comparative examples 1-4 had a sound-absorbing cotton structure, comparative example 5 had no sound-absorbing cotton, comparative example 4 had no annular main muffling chamber, and the annular main muffling chamber of comparative example 3 was in communication with the tire cavity.
And (3) performance testing: after the GB 4502 test, the sound-absorbing cotton does not fall off.
And (3) noise testing: tool: BBM data acquisition system, three-dimensional acceleration sensor, microphone (microphone). Aiming at detection tires of different schemes, an automobile passes through the tire detection device at a speed of 80km/h on a smooth road surface and a rough road surface, and the noise level DB is measured under the frequency of 200-300 Hz.
The specific results are as follows:
the previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention, including any reference to the above-mentioned embodiments. Various modifications to these embodiments will be readily apparent to those skilled in the art. The general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. Tire noise fallsThe low system comprises a pneumatic tire with a cavity, wherein the pneumatic tire is provided with a tread part (1), a bead part (3) and a sidewall part (2), the inner wall of the tread part (1) is provided with strip-shaped sound-absorbing cotton (4) in a bonding way through an adhesive (5), and the low system is characterized in that the strip-shaped sound-absorbing cotton (4) is provided with more than one continuous annular hole (6) along the circumferential direction, the strip-shaped sound-absorbing cotton (4) is connected end to end, and the annular holes (6) are also connected end to form an annular main sound-absorbing cavity which is not communicated with the inner cavity of the tire; the strip-shaped sound-absorbing cotton (4) is a spongy porous material prepared by foaming a high polymer material, and the apparent density is 5kg/m3-50kg/m3The strip-shaped sound absorption cotton (4) is provided with a large number of porous sound attenuation cavities; the side wall of the annular hole (6) is communicated with the plurality of holes of the strip-shaped sound absorption cotton (4), so that the annular main silencing cavity is communicated with the plurality of porous silencing cavities.
2. A tire noise reduction system according to claim 1, wherein a line connecting the center of gravity of the annular hole (6) and the center of the tread of the tire is perpendicular to a center auxiliary line on which the section width of the tire is located.
3. A tire noise reduction system according to claim 1, wherein the annular hole (6) occupies 10 to 40% of the normal cross-sectional area of the strip-shaped sound-absorbing cotton (4), and the apparent density of the strip-shaped sound-absorbing cotton (4) is 5kg/m3-20kg/m3。
4. A tire noise reduction system according to claim 1, wherein the annular hole (6) has a right cross section of a circle, a square, a regular triangle, a regular pentagon, a regular hexagon, or a pentastar.
5. A tire noise reduction system according to claim 3, wherein the radius of the circumscribed circle of the right cross section of the annular hole (6) is Rs, and the thickness Hs of the sound-absorbing cotton is 2mm or more and Rs or less and 0.5Hs-1 mm.
6. A tire noise reduction system as claimed in claim 1, wherein the tire cavity height is Hc and the sound-absorbing cotton has a thickness Hs of 5mm ≤ Hs ≤ 0.8 Hc.
7. A tire noise reduction system according to claim 1, wherein the front section of the band-shaped sound absorbing cotton (4) is a square or an isosceles trapezoid.
8. A tire noise reduction system as in claim 1, wherein said polymeric material is selected from the group consisting of low density polyether, polyurethane and polyester.
9. The tire noise reduction system according to any one of claims 1 to 8, wherein the adhesive (5) is a self-repairing rubber coating having both the functions of puncture-resistant repair-free and sound-absorbing cotton adhesion, the width of the self-repairing rubber coating is 50 to 130% of the width of the tread, and the thickness of the self-repairing rubber coating is 0.5 to 3.5 mm.
10. The tire noise reduction system according to claim 9, wherein the width of the self-repairing rubber coating is set to 100% to 200% of the width of the contact surface with the sound-absorbing cotton, and the impregnation depth of the self-repairing rubber coating impregnated in the sound-absorbing cotton is set to 1 to 3 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110497711.4A CN113682090A (en) | 2021-05-08 | 2021-05-08 | Tire noise reduction system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110497711.4A CN113682090A (en) | 2021-05-08 | 2021-05-08 | Tire noise reduction system |
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| Publication Number | Publication Date |
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| CN113682090A true CN113682090A (en) | 2021-11-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110497711.4A Pending CN113682090A (en) | 2021-05-08 | 2021-05-08 | Tire noise reduction system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114456744A (en) * | 2022-01-19 | 2022-05-10 | 中策橡胶集团股份有限公司 | Tire self-repairing sealant adhered with mute cotton, tire and tire manufacturing method |
| CN115042565A (en) * | 2022-08-01 | 2022-09-13 | 青岛森麒麟轮胎股份有限公司 | Mute tire, quality control method of mute tire and control system |
| CN115635804A (en) * | 2022-11-01 | 2023-01-24 | 重庆金康赛力斯新能源汽车设计院有限公司 | Tire silencing device convenient to install and dismantle |
-
2021
- 2021-05-08 CN CN202110497711.4A patent/CN113682090A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114456744A (en) * | 2022-01-19 | 2022-05-10 | 中策橡胶集团股份有限公司 | Tire self-repairing sealant adhered with mute cotton, tire and tire manufacturing method |
| CN115042565A (en) * | 2022-08-01 | 2022-09-13 | 青岛森麒麟轮胎股份有限公司 | Mute tire, quality control method of mute tire and control system |
| CN115635804A (en) * | 2022-11-01 | 2023-01-24 | 重庆金康赛力斯新能源汽车设计院有限公司 | Tire silencing device convenient to install and dismantle |
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| CB02 | Change of applicant information |
Address after: 310008 No. 1, No. 1 Street, Qiantang District, Hangzhou, Zhejiang Applicant after: Zhongce Rubber Group Co.,Ltd. Address before: 310008 No. 1, Baiyang street, Qiantang District, Hangzhou City, Zhejiang Province Applicant before: ZHONGCE RUBBER GROUP Co.,Ltd. |
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