CN113815354A - Pneumatic tire with tire noise reduction system - Google Patents
Pneumatic tire with tire noise reduction system Download PDFInfo
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- CN113815354A CN113815354A CN202111151350.4A CN202111151350A CN113815354A CN 113815354 A CN113815354 A CN 113815354A CN 202111151350 A CN202111151350 A CN 202111151350A CN 113815354 A CN113815354 A CN 113815354A
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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
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/0008—Tyre tread bands; Tread patterns; Anti-skid inserts characterised by the tread rubber
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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
- B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
- B60C1/0016—Compositions of the tread
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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
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/0041—Tyre tread bands; Tread patterns; Anti-skid inserts comprising different tread rubber layers
- B60C11/005—Tyre tread bands; Tread patterns; Anti-skid inserts comprising different tread rubber layers with cap and base layers
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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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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/32—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof from compositions containing microballoons, e.g. syntactic foams
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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
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/0008—Tyre tread bands; Tread patterns; Anti-skid inserts characterised by the tread rubber
- B60C2011/0016—Physical properties or dimensions
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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
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/0008—Tyre tread bands; Tread patterns; Anti-skid inserts characterised by the tread rubber
- B60C2011/0016—Physical properties or dimensions
- B60C2011/0033—Thickness of the tread
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2309/00—Characterised by the use of homopolymers or copolymers of conjugated diene hydrocarbons
- C08J2309/06—Copolymers with styrene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2407/00—Characterised by the use of natural rubber
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2409/00—Characterised by the use of homopolymers or copolymers of conjugated diene hydrocarbons
- C08J2409/06—Copolymers with styrene
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Tires In General (AREA)
Abstract
The present invention relates to the field of tire manufacturing technology, and more particularly to a pneumatic tire with a tire noise reduction system. A pneumatic tire with a tire noise reduction system comprises a tread, a tire bead, a tire side, a tire body layer and a belt layer arranged on the radial outer side of the tire body layer, wherein the tread is composed of an upper tread and a lower tread, the upper tread is positioned on the surface of the tire surface part, the lower tread is arranged on the lower layer of the upper tread, the ratio of the thickness H1 of the lower tread to the total thickness H0 of the upper tread and the lower tread is more than or equal to 0.2 and less than or equal to H1/H0 and less than or equal to 0.6; the lower tread is subjected to foaming treatment, the foaming porosity is controlled to be between 1 and 5 percent, and the foaming pore diameter is between 0.5 and 5 mu m. The lower tread part of the tire is subjected to micro-foaming, so that the noise of the tire is reduced.
Description
Technical Field
The present invention relates to the field of tire manufacturing technology, and more particularly to a pneumatic tire with a tire noise reduction system.
Background
In recent years, with the rise of electric vehicles, consumers have made higher demands on the comfort of use of the vehicles, and among them, reduction of tire noise during driving is a very important indicator. The european union, japan, korea, and countries including china continue to develop a "tire labeling law" relating to tire noise. The regulatory requirements, the noise of tires destined for the above regions, need to meet the most basic admission requirements.
With the good control of the engine noise and the vibration noise of the vehicle body, the tire noise accounts for a further increase in the vehicle noise. When the vehicle speed exceeds 80km/h, the tire noise becomes a main component of the vehicle running noise. The faster the vehicle speed and the greater the load, the higher the energy level of the tire noise and the greater the proportion of the tire noise in the vehicle running noise. The tyre is the only part of the vehicle in contact with the ground, and its noise radiation and vibration characteristics directly affect the ride comfort and smoothness of the car. Therefore, various large automobile companies at home and abroad develop researches on tire noise and put forward more rigorous requirements on the noise of matched tires.
At present, the noise reduction method is various, and the purpose can be achieved by changing the pattern or using the corresponding tread formula, but the method increases the cost or reduces the performance of other aspects of the tire.
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.
Meanwhile, the applicant applies for a tire noise reduction system of Chinese invention patent application (application No. 2021104977114, application date: 20210508), which comprises a pneumatic tire with a cavity, wherein the pneumatic tire is provided with a tread part, a bead part and a sidewall part, the inner wall of the tread part is provided with strip-shaped sound absorption cotton through adhesive bonding, the strip-shaped sound absorption cotton is provided with more than one continuous annular holes along the circumferential direction, the strip-shaped sound absorption cotton is connected end to end, and the annular holes are also connected end to form a ringA large annular noise-damping chamber 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 above patent also uses a belt-shaped sound-absorbing cotton to reduce the noise of the tire, and the applicant has found that the tire noise can be further reduced by slightly foaming the under tread portion of the tread, and has not been disclosed in the prior art.
Disclosure of Invention
In order to solve the above-described problems, it is an object of the present invention to provide a pneumatic tire having a tire noise reduction system in which a tread portion of the tire is micro-foamed to reduce tire noise.
In order to achieve the purpose, the invention adopts the following technical scheme:
a pneumatic tire with a tire noise reduction system comprises a tread, a tire bead, a tire side, a tire body layer and a belt layer arranged on the radial outer side of the tire body layer, wherein the tread is composed of an upper tread and a lower tread, the upper tread is positioned on the surface of the tire surface part, the lower tread is arranged on the lower layer of the upper tread, the ratio of the thickness H1 of the lower tread to the total thickness H0 of the upper tread and the lower tread is more than or equal to 0.2 and less than or equal to H1/H0 and less than or equal to 0.6; the lower tread is subjected to foaming treatment, the foaming porosity is controlled to be between 1 and 5 percent, and the foaming pore diameter is between 0.5 and 5 mu m.
Preferably, the lower tread HAs a hardness of 55-68 HA and a thickness of 2.0-6.0 mm.
Preferably, the undertread is vulcanized from a rubber composition comprising:
100 parts by weight of a rubber component and 1.0 to 10.0 parts by weight of (a) a foamed material, and (b) a reinforcing filler, wherein the total amount of components (a) and (b) is 30 to 130 parts by weight;
the foaming material is composed of foaming master batch particles and porous diatomite, and the mass ratio of the foaming master batch particles to the porous diatomite is 1: 5-5: 1; the foamed master rubber particle adoptsThe ethylene propylene diene monomer is characterized in that a chemical foaming agent adopts a foaming capsule, and the mass ratio of the ethylene propylene diene monomer to the foaming capsule is 1: 1-2: 1; the porous diatomite is freshwater algae fossil, and has particle diameter of 5-20um and nitrogen adsorption specific surface area NSA of 25-40m measured by scanning electron microscope2(iii) a columnar inorganic filler having a porous structure and a pH value close to neutral.
As still more preferred, the rubber component is selected from the group consisting of natural rubber, solution-polymerized styrene-butadiene rubber 1 and solution-polymerized styrene-butadiene rubber 2; according to parts by weight, natural rubber: 20.0-30.0 parts of solution polymerized styrene-butadiene rubber 1: 40.0-50.0 parts; solution polymerized styrene-butadiene rubber 2: 25.0-35.0 parts; the solution polymerized styrene-butadiene rubber 1 contains 30-40% of combined styrene and 35-45% of vinyl; the styrene in the solution polymerized styrene-butadiene rubber 2 accounts for 15-25% of the total weight of the polymer, and the vinyl accounts for 50-60% of the total weight of the butadiene.
Preferably, the reinforcing filler comprises the following components in parts by weight: 5.0-25.0 parts of carbon black: 30.0-65.0 parts; the white carbon black is white carbon black with high specific surface area, and the nitrogen adsorption specific surface area NSA is 145-250m2Between/g; the carbon black is super abrasion-resistant carbon black and has a high external surface area (STSA) in the range of 100-2Between/g.
Preferably, the composition also comprises 2.0 to 6.0 parts of silane coupling agent, wherein the silane coupling agent is thiocarboxylate silane with sulfydryl; preferably, the silane coupling agent is one of bis- [ (triethoxysilyl) -propyl ] tetrasulfide and bis- [ (triethoxysilyl) -propyl ] disulfide.
Preferably, the composition also comprises 10 to 25 parts of environment-friendly aromatic oil, 2.0 to 5.0 parts of homogenizing agent, 2.0 to 8.0 parts of rubber activating agent, 3.0 to 7.0 parts of rubber anti-aging agent, 1.0 to 3.0 parts of sulfur and 1.5 to 4.0 parts of vulcanization accelerator.
Preferably, the inner wall of the carcass layer is provided with strip-shaped sound-absorbing cotton along the circumferential direction; the strip-shaped sound-absorbing cotton is a spongy porous material prepared by foaming a high polymer material; the radial height of the tire between the tire bead base line and the equator point of the tire cavity is defined as the height Hc of the tire cavity and the thickness Hs of the strip-shaped sound-absorbing cotton, and the height Hs is more than 20mm and less than 0.2 multiplied by Hc.
Preferably, more than one continuous annular hole is formed in the strip-shaped sound-absorbing cotton 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 main sound-absorbing cavity which is not communicated with the inner cavity of the tire; the side wall of the annular hole is communicated with the multiple holes of the strip-shaped sound absorption cotton, so that the annular main silencing cavity is communicated with the multiple porous silencing cavities. The silencing cavity is used for further weakening the vibration of sound waves in the inner cavity of the tire, so that the aim of reducing noise is fulfilled.
Preferably, a connecting line of the center of gravity of the annular hole and the center of the tire tread is perpendicular to a central auxiliary line where the section width of the tire is located; the annular holes account for 10-50% of the area of the positive section of the strip-shaped sound-absorbing cotton; the apparent density of the strip-shaped sound absorption cotton is 5kg/m3-20kg/m 3.
Preferably, the radius Rs of the center of the section of the silencing cavity is required to be more than 4.5mm and less than Rs and less than 0.5Hs-1 mm.
Due to the adoption of the technical scheme, the lower tread part of the tire is subjected to micro-foaming, so that the noise of the tire is reduced. Furthermore, the tire is foamed by mixing chemical foaming and inorganic foaming to generate a microporous structure, the inorganic foaming uses porous diatomite, and the chemical foaming uses the foaming masterbatch particles, so that potential safety hazards caused by the inflammability of the chemical foaming agent to production are prevented, meanwhile, the use amount of the foaming masterbatch particles is controlled, and the expansion rate of the foaming rubber material is prevented from being too high. Furthermore, 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 to be used as a main body sound-deadening cavity; and the specific weight 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 invention.
Fig. 2 is a schematic structural diagram of embodiment 4 of the present invention.
Detailed Description
The following describes a detailed embodiment of the present invention with reference to the accompanying drawings.
A pneumatic tire with a tire noise reduction system as shown in FIG. 1 comprises a tread 1, a bead 2, a sidewall 3, a carcass layer 4 and a belt layer 5 arranged at the radial outer side of the carcass layer, wherein the tread 1 is composed of an upper tread 11 and a lower tread 12, the upper tread 11 is positioned on the surface of the tread part, the lower tread 12 is arranged at the lower layer of the upper tread 11, the ratio of the thickness H1 of the lower tread 12 to the total thickness H0 of the upper tread and the lower tread is more than or equal to 0.2 and less than or equal to H1/H0 and less than or equal to 0.6; the lower tread is subjected to foaming treatment, the foaming porosity is controlled to be between 1 and 5 percent, and the foaming pore diameter is between 0.5 and 5 mu m.
Because the lower tread 11 rubber is difficult to press by the capsule during over-soft vulcanization molding and keeps the shape, meanwhile, the over-soft rubber affects the rigidity of the tire, and the steering performance of the tire is reduced, the ideal hardness is 55-68 HA, the rubber hardness of the lower tread 11 is required to be smaller than the rubber hardness of the tread, and the difference is more than or equal to 1HA, so that the resonance frequency of the tire can be changed, and the noise of the tire in a low frequency range is reduced. In addition, the thickness of the lower tread rubber 11 needs to be limited within 2.0-6.0 mm, the rigidity of the tread is greatly reduced when the thickness exceeds 6.0mm, the operation response performance of the tire is affected, and the effect of the lower tread rubber cannot be reflected when the thickness is less than 2.0 mm.
Reference ratio
The lower tread comprises the following raw materials: 25.0 parts of natural rubber, 43.0 parts of solution-polymerized styrene-butadiene rubber 1, 32.0 parts of solution-polymerized styrene-butadiene rubber 2, 40.0 parts of white carbon black 1165MP, 22.0 parts of carbon black N234, 4.0 parts of silane coupling agent Si-75, 10.0 parts of environment-friendly aromatic oil, 2.0 parts of age inhibitor 6PPD, 0.7 parts of age inhibitor TMQ, 1.5 parts of microcrystalline wax, 2.5 parts of zinc oxide, 1.3 parts of stearic acid, 4.0 parts of homogenizing agent, 2.0 parts of sulfur, 1.5 parts of accelerator CZ and 1.0 part of accelerator DPG.
Wherein, the solution polymerized styrene-butadiene rubber 1: bound styrene represents 36% of the total weight of the polymer and vinyl represents 40% of the total weight of the butylene; solution polymerized styrene-butadiene rubber 2: the bound styrene accounted for 20% of the total polymer weight and the vinyl accounted for 55% of the total butylene weight.
Example 1
The lower tread comprises the following raw materials: 25.0 parts of natural rubber, 43.0 parts of solution-polymerized styrene-butadiene rubber 1, 32.0 parts of solution-polymerized styrene-butadiene rubber 2, 40.0 parts of high-fraction white carbon black 1165MP, 22.0 parts of carbon black N234, 4.0 parts of silane coupling agent Si-75, 10.0 parts of environment-friendly aromatic oil, 3.5 parts of foamed master batch particles, 2.0 parts of porous diatomite, 2.0 parts of age inhibitor 6PPD, 0.7 parts of age inhibitor TMQ, 1.5 parts of microcrystalline wax, 2.5 parts of zinc oxide, 1.3 parts of stearic acid, 4.0 parts of homogenizing agent, 2.0 parts of sulfur, 1.5 parts of accelerator CZ and 1.0 part of accelerator DPG.
The materials except for the foamed masterbatch and the porous diatomaceous earth were the same as those in the reference example. During rubber material processing, the foaming master batch particles need to be added in a vulcanization stage, and the vulcanization temperature is not more than 100 ℃. The foamed master rubber particles adopt ethylene propylene diene monomer, the chemical foaming agent adopts a foamed capsule, and the mass ratio of the ethylene propylene diene monomer to the foamed capsule is 1: 2. It is characterized in that at the high temperature of 140-180 ℃, the shell of the foaming capsule is softened, and the liquid hydrocarbon in the foaming capsule is vaporized, so that the size of the foaming capsule is increased, and the foaming effect is achieved. The porous diatomaceous earth is freshwater algae fossil, and has particle diameter of 5-20um and nitrogen adsorption specific surface area (NSA) of 25-40m measured by scanning electron microscope2(iii) a columnar inorganic filler having a porous structure and a pH value close to neutral.
Example 2
The lower tread comprises the following raw materials: 25.0 parts of natural rubber, 43.0 parts of solution-polymerized styrene-butadiene rubber 1, 32.0 parts of solution-polymerized styrene-butadiene rubber 2, 40.0 parts of high-fraction white carbon black 1165MP, 22.0 parts of carbon black N234, 4.0 parts of silane coupling agent Si-75, 10.0 parts of environment-friendly aromatic oil, 6.7 parts of foamed master batch particles, 4 parts of porous diatomite, 2.0 parts of age inhibitor 6PPD, 0.7 parts of age inhibitor TMQ, 1.5 parts of microcrystalline wax, 2.5 parts of zinc oxide, 1.3 parts of stearic acid, 4.0 parts of homogenizing agent, 2.0 parts of sulfur, 1.5 parts of promoter CZ and 1.0 part of promoter DPG.
Wherein the materials and sizing processing were the same as in example 1.
Example 3
The lower tread comprises the following raw materials: 25.0 parts of natural rubber, 43.0 parts of solution-polymerized styrene-butadiene rubber 1, 32.0 parts of solution-polymerized styrene-butadiene rubber 2, 40.0 parts of high-fraction white carbon black 1165MP, 22.0 parts of carbon black N234, 4.0 parts of silane coupling agent Si-75, 10.0 parts of environment-friendly aromatic oil, 3.5 parts of foamed master batch particles, 2.0 parts of porous diatomite, 2.0 parts of age inhibitor 6PPD, 0.7 parts of age inhibitor TMQ, 1.5 parts of microcrystalline wax, 2.5 parts of zinc oxide, 1.3 parts of stearic acid, 4.0 parts of homogenizing agent, 2.0 parts of sulfur, 1.5 parts of accelerator CZ and 1.0 part of accelerator DPG.
Wherein the materials and sizing processing were the same as in example 1.
The reference examples and examples 1 to 3 were identical in structure, as shown in FIG. 1.
Example 4
The tread raw material in example 1 is adopted, and the structure of the mute cotton is added on the structure of fig. 1, as shown in fig. 2.
The inner wall of the tire is provided with strip-shaped sound-absorbing cotton 6 through adhesive bonding, the strip-shaped sound-absorbing cotton 6 is a spongy porous material prepared by polyurethane foaming, and the apparent density of the strip-shaped sound-absorbing cotton 6 is 20kg/m3The height Hc of the square tire cavity of the strip-shaped sound-absorbing cotton 6 is 41mm in the right section, and the thickness Hs of the sound-absorbing cotton is 30 mm. The strip-shaped sound-absorbing cotton 6 is provided with a continuous annular hole 7 along the circumferential direction, the right section of the annular hole 7 is circular, the section of the annular hole accounts for 30% of the area of the right section of the strip-shaped sound-absorbing cotton, and the radius of the circle is Rs and is 8 mm. The connecting line of the center of gravity of the annular hole 7 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 6 is connected end to end, and the annular hole 7 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 7 is communicated with the plurality of holes of the strip-shaped sound absorption cotton 6, so that the annular main silencing cavity is communicated with a plurality of porous silencing cavities.
TABLE 1 sizing-related parameters for the examples and the reference examples
| Reference ratio | Example 1 | Example 2 | Example 3 | Example 4 | |
| 300% definite elongation | 14.7Mpa | 12.4Mpa | 13.7Mpa | 13.7Mpa | 12.4Mpa |
| Elongation at break | 360％ | 454％ | 424％ | 424％ | 454％ |
| Hardness of | 68HA | 63HA | 65HA | 65HA | 63HA |
| 60℃tanδ | 0.121 | 0.049 | 0.061 | 0.061 | 0.049 |
| Tire noise | 73.8dB | 72.6dB | 72.5dB | 70.6dB | 68.5dB |
| Rolling resistance | 7.5 | 7.0 | 6.9 | 7.0 | 7.0 |
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 (11)
1. A pneumatic tire with a tire noise reduction system comprises a tread, a tire bead, a tire side, a tire body layer and a belt layer arranged on the radial outer side of the tire body layer, and is characterized in that the tread is composed of an upper tread and a lower tread, the upper tread is positioned on the surface of the tire surface part, the lower tread is arranged on the lower layer of the upper tread, the ratio of the thickness H1 of the lower tread to the total thickness H0 of the upper tread and the lower tread is more than or equal to 0.2 and less than or equal to H1/H0 and less than or equal to 0.6; the lower tread is subjected to foaming treatment, the foaming porosity is controlled to be between 1 and 5 percent, and the foaming pore diameter is between 0.5 and 5 mu m.
2. A pneumatic tire having a tire noise reduction system as in claim 1, wherein the under tread hardness is 55 to 68HA and the thickness is limited to 2.0 to 6.0 mm.
3. A pneumatic tire having a tire noise reduction system as in claim 1, wherein the undertread is vulcanized from a rubber composition comprising:
100 parts by weight of a rubber component and 1.0 to 10.0 parts by weight of (a) a foamed material, and (b) a reinforcing filler, wherein the total amount of components (a) and (b) is 30 to 130 parts by weight;
the foaming material is composed of foaming master batch particles and porous diatomite, and the mass ratio of the foaming master batch particles to the porous diatomite is 1: 5-5: 1; the foamed master rubber particle is made of ethylene propylene diene monomer, the chemical foaming agent is made of a foamed capsule, and the mass ratio of the ethylene propylene diene monomer to the foamed capsule is 1: 1-2: 1; the porous diatomite is freshwater algae fossil, and has particle diameter of 5-20um and nitrogen adsorption specific surface area NSA of 25-40m measured by scanning electron microscope2(iii) a columnar inorganic filler having a porous structure and a pH value close to neutral.
4. A pneumatic tire having a tire noise reduction system as in claim 2, wherein the rubber component is selected from the group consisting of natural rubber, solution-polymerized styrene-butadiene rubber 1 and solution-polymerized styrene-butadiene rubber 2; according to parts by weight, natural rubber: 20.0-30.0 parts of solution polymerized styrene-butadiene rubber 1: 40.0-50.0 parts; solution polymerized styrene-butadiene rubber 2: 25.0-35.0 parts; the solution polymerized styrene-butadiene rubber 1 contains 30-40% of combined styrene and 35-45% of vinyl; the styrene in the solution polymerized styrene-butadiene rubber 2 accounts for 15-25% of the total weight of the polymer, and the vinyl accounts for 50-60% of the total weight of the butadiene.
5. A pneumatic tire having a tire noise reduction system as in claim 2, wherein the reinforcing filler comprises, in parts by weight, white carbon black: 5.0-25.0 parts of carbon black: 30.0-65.0 parts; the white carbon black is white carbon black with high specific surface area, and the nitrogen adsorption specific surface area NSA is 145-250m2Between/g; the carbon black is super abrasion-resistant carbon black and has a high external surface area (STSA) in the range of 100-2Between/g.
6. A pneumatic tire having a tire noise reduction system as in claim 4, wherein said composition further comprises 2.0 to 6.0 parts of a silane coupling agent which is a thiocarboxylate silane having a mercapto group; preferably, the silane coupling agent is one of bis- [ (triethoxysilyl) -propyl ] tetrasulfide and bis- [ (triethoxysilyl) -propyl ] disulfide.
7. A pneumatic tire with a tire noise reduction system as in claim 4, wherein the rubber composition further comprises, as raw materials, 10 to 25 parts of an environmentally friendly aromatic oil, 2.0 to 5.0 parts of a homogenizing agent, 2.0 to 8.0 parts of a rubber activating agent, 3.0 to 7.0 parts of a rubber antioxidant, 1.0 to 3.0 parts of sulfur, and 1.5 to 4.0 parts of a vulcanization accelerator.
8. A pneumatic tire having a tire noise reduction system according to claim 1, wherein the inner wall of the carcass layer is provided with band-shaped sound-absorbing cotton in the circumferential direction; the strip-shaped sound-absorbing cotton is a spongy porous material prepared by foaming a high polymer material; the radial height of the tire between the tire bead base line and the equator point of the tire cavity is defined as the height Hc of the tire cavity and the thickness Hs of the strip-shaped sound-absorbing cotton, and the height Hs is more than 20mm and less than 0.2 multiplied by Hc.
9. A pneumatic tire having a tire noise reduction system as in claim 7, wherein said sound-absorbing band is circumferentially provided with at least one continuous annular hole, said sound-absorbing band being connected end to form a main annular sound-absorbing chamber which is not in communication with the interior of the tire; the side wall of the annular hole is communicated with the multiple holes of the strip-shaped sound absorption cotton, so that the annular main silencing cavity is communicated with the multiple porous silencing cavities.
10. A pneumatic tire having a tire noise reduction system as in claim 8, wherein the line connecting the center of gravity of the annular aperture to the center of the tread of the tire is perpendicular to the auxiliary center line along which the section width of the tire is located; the annular holes account for 10-50% of the area of the positive section of the strip-shaped sound-absorbing cotton;the apparent density of the strip-shaped sound absorption cotton is 5kg/m3-20kg/m3。
11. A pneumatic tire having a tire noise reduction system as in claim 8, wherein the radius Rs of the center of the cross section of the noise reduction chamber is such that 4.5mm < Rs < 0.5Hs "1 mm.
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| CN202111151350.4A CN113815354A (en) | 2021-09-29 | 2021-09-29 | Pneumatic tire with tire noise reduction system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114805954A (en) * | 2022-04-06 | 2022-07-29 | 中策橡胶集团股份有限公司 | Carbon black reinforced tire tread rubber material, mixing method and pneumatic tire with double-layer tread |
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2021
- 2021-09-29 CN CN202111151350.4A patent/CN113815354A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114805954A (en) * | 2022-04-06 | 2022-07-29 | 中策橡胶集团股份有限公司 | Carbon black reinforced tire tread rubber material, mixing method and pneumatic tire with double-layer tread |
| CN114805954B (en) * | 2022-04-06 | 2023-09-12 | 中策橡胶集团股份有限公司 | Carbon black reinforced tire lower tread rubber material, mixing method and double-layer tread pneumatic tire |
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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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