US20190299722A1 - Pneumatic tire - Google Patents

Pneumatic tire Download PDF

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Publication number
US20190299722A1
US20190299722A1 US15/781,968 US201715781968A US2019299722A1 US 20190299722 A1 US20190299722 A1 US 20190299722A1 US 201715781968 A US201715781968 A US 201715781968A US 2019299722 A1 US2019299722 A1 US 2019299722A1
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US
United States
Prior art keywords
pneumatic tire
noise
tire
noise damper
belt layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US15/781,968
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English (en)
Inventor
Masako Nakatani
Takahiro KAWACHI
Ayuko YAMADA
Takuya Horiguchi
Masataka Hiro
Takayuki Nagase
Hiroshi Ito
Fumiya KATO
Subaru TOYA
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Sumitomo Rubber Industries Ltd
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Sumitomo Rubber Industries Ltd
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Filing date
Publication date
Application filed by Sumitomo Rubber Industries Ltd filed Critical Sumitomo Rubber Industries Ltd
Assigned to SUMITOMO RUBBER INDUSTRIES, LTD. reassignment SUMITOMO RUBBER INDUSTRIES, LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KATO, Fumiya, TOYA, Subaru, HIRO, MASATAKA, ITO, HIROSHI, KAWACHI, TAKAHIRO, NAGASE, TAKAYUKI, NAKATANI, MASAKO, YAMADA, AYUKO, HORIGUCHI, TAKUYA
Publication of US20190299722A1 publication Critical patent/US20190299722A1/en
Abandoned legal-status Critical Current

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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
    • 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
    • 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
    • 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
    • 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
    • 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
    • B60C5/00—Inflatable pneumatic tyres or inner tubes
    • 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
    • B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
    • B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
    • C08K3/04—Carbon
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/34—Silicon-containing compounds
    • C08K3/36—Silica
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L21/00—Compositions of unspecified rubbers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L7/00—Compositions of natural rubber
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
    • C08L9/06—Copolymers with styrene
    • 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
    • B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
    • B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
    • B60C2009/1828—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers characterised by special physical properties of the belt ply
    • 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
    • B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
    • B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
    • B60C9/1835—Rubber strips or cushions at the belt edges
    • B60C2009/1842—Width or thickness of the strips or cushions
    • 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
    • B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
    • B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
    • B60C2009/1878—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers with flat cushions or shear layers between the carcass and the belt
    • 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
    • B60C2011/0025—Modulus or tan delta
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
    • C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend

Definitions

  • the present invention relates to a pneumatic tire provided with a noise damper on an inner cavity surface of a tread portion.
  • Patent Literature 1 Conventionally, as a technique for suppressing running noise of a pneumatic tire, as disclosed in Patent Literature 1, a pneumatic tire has been known in which a noise damper made of a sponge material is arranged on the inner cavity surface of the tread portion.
  • the puncture repair liquid In the puncture repair using the puncture repair liquid, it is necessary to spread the puncture repair liquid on the inner cavity surface of the repair spot where a through hole is formed, therefore, firstly the pneumatic tire is rotated so that the repair spot is positioned downward and then the puncture repair liquid is injected into the pneumatic tire in that state.
  • the puncture repair liquid is used for repairing the puncture of the pneumatic tire provided with the noise damper as disclosed in Patent Literature 1
  • the puncture repair liquid is absorbed in pores of the noise damper.
  • the puncture repair liquid is intensively absorbed by the noise damper in the repair spot, thus, it is difficult for the puncture repair liquid to be uniformly distributed in a tire circumferential direction, therefore, it is possible that force variation, that is, uniformity of the pneumatic tire after the puncture repair is affected.
  • uniformity refers to the uniformity of the weight including the tire, the noise damper, and the puncture repair liquid. If such uniformity is impaired, it is possible that running noise tends to become large.
  • the present invention was made in view of the above, and a primary object thereof is to provide a pneumatic tire capable of suppressing influence on the uniformity after puncture repair while suppressing the running noise.
  • density of the noise damper is in a range of from 10 to 40 kg/m3.
  • volume V 1 of the noise damper is in a range of from 0.4% to 30% of total volume V 2 of a tire inner cavity.
  • tensile strength of the noise damper is in a range of from 70 to 115 kPa.
  • a loss tangent tan ⁇ at 0 degree Celsius of a tread rubber arranged on an outer side in the tire radial direction of the belt layer is not less than 0.4 and the loss tangent tan ⁇ at 70 degrees Celsius of the tread rubber is not more than 0.2.
  • a tread rubber arranged on an outer side in the tire radial direction of the belt layer is a rubber composition having a value not less than 20, the value being calculated by a following formula: (1.4 ⁇ carbon black content (phr)+silica content (phr))/sulfur content (phr).
  • the pneumatic tire according to the invention further comprises a damping rubber body arranged inside of the tread portion.
  • a width W 1 in a tire axial direction of the damping rubber body is in a range of from 60% to 130% of a width W 2 in the tire axial direction of the belt layer.
  • the damping rubber body is arranged between the carcass and the belt layer.
  • the pneumatic tire according to the invention further comprises a band layer arranged on an outer side in the tire radial direction of the belt layer and inside of the tread portion, and the damping rubber body is arranged between the belt layer and the band layer.
  • the pneumatic tire according to the invention further comprises a band layer arranged on an outer side in the tire radial direction of the belt layer and inside of the tread portion, and the damping rubber body is arranged on an outer side in the tire radial direction of the band layer.
  • thickness in the tire radial direction of the damping rubber body is not less than 0.3 mm.
  • relationship between hardness H 1 of the damping rubber body and hardness H 2 of a tread rubber arranged on an outer side in the tire radial direction of the belt layer satisfies a following expression: 0.5 ⁇ H 1 /H 2 ⁇ 1.0.
  • the noise damper is provided on the inner cavity surface of the tread portion, therefore, cavity resonance in the tire inner cavity is suppressed, thereby, the running noise of the pneumatic tire is decreased.
  • the water absorption rate of the noise damper calculated by the above formula (1) is in a range of from 10% to 25%, therefore, the absorption of the puncture repair liquid by the noise damper is suppressed.
  • the puncture repair liquid is likely to be uniformly distributed in the tire circumferential direction without concentrating on a part of the noise damper at the repair spot, therefore, it is possible that the deterioration of the uniformity (that is the uniformity of the weight including the pneumatic tire, the noise damper, and the puncture repair liquid) is prevented, thereby, it is possible that the running noise is effectively prevented.
  • FIG. 1 a cross-sectional view of a pneumatic tire as an embodiment of the present invention.
  • FIG. 2 a cross-sectional view of the pneumatic tire of FIG. 1 after puncture repair.
  • FIG. 3 a cross-sectional view of a pneumatic tire as another embodiment of the present invention.
  • FIG. 4 a cross-sectional view of a pneumatic tire as another embodiment of the present invention.
  • FIG. 1 is a tire meridian section passing through a tire rotational axis of a pneumatic tire 1 of the present embodiment in a standard state.
  • the standard state is a state in which the tire is mounted on a standard rim, inflated to a standard inner pressure, and loaded with no tire load.
  • dimensions and the like of various parts of the tire are those measured under the standard state, unless otherwise noted.
  • the “standard rim” is a wheel rim specified for the concerned tire by a standard included in a standardization system on which the tire is based, for example, the “normal wheel rim” in JATMA, “Design Rim” in TRA, and “Measuring Rim” in ETRTO.
  • the “standard inner pressure” is air pressure specified for the concerned tire by a standard included in a standardization system on which the tire is based, for example, the “maximum air pressure” in JATMA, maximum value listed in the “TIRE LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES” table in TRA, and “INFLATION PRESSURE” in ETRTO.
  • the tire is for a passenger car, it is set to 200 kPa uniformly in consideration of the actual use frequency and the like.
  • the pneumatic tire (hereinafter may be simply referred to as “tire”) 1 in this embodiment is provided with a carcass 6 extending between bead cores 5 of bead portions 4 via a tread portion 2 and sidewall portions 3 , and a belt layer 7 arranged on an outer side in a tire radial direction of the carcass 6 and inside the tread portion 2 .
  • a tire for a passenger car is shown as the tire 1 .
  • the carcass 6 is formed by a single carcass ply 6 A, for example.
  • the carcass ply 6 A includes a main body portion 6 a extending between the bead cores 5 and turned up portions 6 b each being turned up around respective one of the bead cores 5 from inside to outside in a tire axial direction so as to be engaged with the respective one of the bead cores 5 .
  • organic fiber cords made of an organic material such as aromatic polyamide and rayon are used as carcass cords, for example.
  • the carcass cords are arranged at an angle in a range of from 70 to 90 degrees with respect to a tire equator C, for example.
  • the carcass ply 6 A is formed by a plurality of the carcass cords covered with topping rubber. Between the main body portion 6 a and each of the turned up portions 6 b , a bead apex rubber 8 extending radially outwardly from respective one of the bead cores 5 in a tapered manner is arranged.
  • a tread rubber Tg for forming a ground contacting surface On an outer side of the carcass 6 , a tread rubber Tg for forming a ground contacting surface, sidewall rubbers sg each for forming an outer surface of respective one of the sidewall portions 3 , bead rubbers Bg each for forming an outer surface of respective one of the bead portions 4 , and the like are arranged.
  • an inner liner rubber Lg for keeping tire inner pressure and the like are arranged on an inner side of the carcass 6 .
  • the belt layer 7 in this embodiment is formed by two belt plies 7 A and 7 B in which belt cords are arranged at an angle in a range of from 15 to 45 degrees with respect to the tire equator C, for example, and the belt plies 7 A and 7 B are overlapped in the tire radial direction so that the belt cords of the belt ply 7 A and the belt cords of the belt ply 7 B cross each other.
  • the belt cords steel, aramid, rayon or the like is suitably used, for example.
  • the belt plies 7 A and 7 B are formed.
  • the pneumatic tire 1 in this embodiment is provided with a band layer 9 arranged on an outer side in the tire radial direction of the belt layer 7 .
  • the band layer 9 includes a band ply 9 A in which band cords of an organic fiber, nylon cords in this embodiment, are spirally wound at an angle not more than 10 degrees, preferably not more than 5 degrees with respect to the tire circumferential direction.
  • the pneumatic tire 1 is provided with a noise damper 20 arranged on an inner cavity surface of the tread portion 2 .
  • the noise damper 20 is made of a porous sponge material, for example.
  • the sponge material is a cavernous porous structure body including not only a so-called sponge itself having interconnected cells formed by foamed rubber or a synthetic resin but also a web body formed of an animal fiber, a vegetable fiber, or a synthetic fiber and the like integrally interwoven, for example.
  • the “porous structure body” includes not only a body having the interconnected cells but also a body having closed cells.
  • a sponge material made of polyurethane having interconnected cells is used for the noise damper 20 in this embodiment.
  • the pores on the surface of or inside the sponge material convert vibration energy of the vibrating air into thermal energy, therefore, the vibration energy is consumed, thereby, sound (cavity resonance energy) is decreased, therefore, the running noise of the pneumatic tire 1 is decreased.
  • the sponge material is easy to deform such as contraction, flexion, etc., therefore, deformation of the tire during running is not substantially affected. Thereby, it is possible that deterioration of steering stability is prevented.
  • specific gravity of the sponge material is very small, therefore, it is possible that deterioration of weight balance of the tire is prevented.
  • synthetic resin sponge such as ether type polyurethane sponge, ester type polyurethane sponge, polyethylene sponge, and rubber sponge such as chloroprene rubber sponge (CR sponge), ethylene propylene rubber sponge (EDPM sponge), nitrile rubber sponge (NBR sponge)
  • a polyurethane type or polyethylene type sponge including an ether type polyurethane sponge is preferred from the point of view of noise damping property, lightweight property, controllability of foaming, durability, and the like.
  • the noise damper 20 has an elongated belt-like shape having a bottom surface fixed to the inner cavity surface of the tread portion 2 and extends in the tire circumferential direction. At this time, outer end portions in the circumferential direction of the noise damper may be in contact with each other to form a substantially annular shape, or the outer end portions may be spaced apart in the tire circumferential direction.
  • the noise damper 20 has substantially the same cross-sectional shape at an arbitrary position in the tire circumferential direction except for the outer end portions.
  • the cross-sectional shape is a flat and horizontally elongated shape in which a height is smaller than a width in the tire axial direction.
  • FIG. 2 is the pneumatic tire 1 after puncture repair by using a puncture repair liquid.
  • a through hole 40 formed in the tread portion 2 by running over a nail and the like is filled with puncture repair liquid 41 , therefore, the through hole 40 is sealed.
  • a water absorption rate of the noise damper 20 is in a range of from 10% to 25%.
  • the water absorption rate of the noise damper 20 is calculated by the following formula (1).
  • a test piece having a length of 50 mm, a width of 50 mm, and a thickness of 20 mm is used. After measuring the weight before immersion, the test piece was compressed by 50% in the thickness direction, then the weight was measured after immersion in water at a temperature of 20 degrees Celsius and at water depth of 10 cm for 24 hours. Since the volume at 50% compression can be calculated from the above dimensions of the test piece, the water absorption rate (%) is calculated from the measured weight by the above formula (1). Note that the volume of the test piece described above is an apparent volume similarly to a volume V 1 described later.
  • the test piece whose weight or the like is to be measured is not limited to the test piece having the above dimensions.
  • the dimensions of the test piece can be appropriately changed according to the size, shape, etc. of the noise damper 20 .
  • the noise damper 20 is disposed on the inner cavity surface of the tread portion 2 , therefore, the cavity resonance in a tire inner cavity is suppressed, thereby, the running noise of the pneumatic tire 1 is reduced.
  • the water absorption rate of the noise damper 20 calculated by the above formula (1) is not less than 10%.
  • the noise damper 20 configured as such absorbs more resonance energy by the cells connected with the surface of the noise damper 20 , therefore, large effect of suppressing the cavity resonance is exerted.
  • the water absorption rate of the noise damper 20 calculated by the above formula (1) is not more than 25%.
  • the noise damper 20 configured as such local absorption of the puncture repair liquid 41 is suppressed.
  • the puncture repair liquid 41 is likely to be uniformly distributed over the entire circumference in the tire circumferential direction without concentrating on a part of the noise damper 20 at the repair spot.
  • the influence on the force variation after puncture repair is suppressed, therefore, it is possible that deterioration of the uniformity of the pneumatic tire 1 is suppressed.
  • uniformity refers to the uniformity of the weight including the pneumatic tire 1 , the noise damper 20 , and the puncture repair liquid 41 . If such uniformity is impaired, it is possible that the running noise tends to be large.
  • the upper limit of the water absorption rate of the noise damper 20 is set as described above, therefore, it is possible that the suppression effect of the cavity resonance is small as compared with a pneumatic tire in which a noise damper having a higher water absorption rate is arranged.
  • a damping rubber body 30 is disposed inside the tread portion 2 .
  • the damping rubber body 30 is arranged between the carcass 6 and the belt layer 7 .
  • a width W 1 in the tire axial direction of the damping rubber body 30 is in a range of from 60% to 130% of a width W 2 in the tire axial direction of the belt layer.
  • the damping rubber body 30 configured as such suppresses the vibration of the tread portion 2 without contributing to the weight increase of the pneumatic tire 1 , and in particular contributes to the reduction of the running noise around 160 Hz. Thereby, it is possible that the deterioration of the uniformity of the pneumatic tire 1 after puncture repair is suppressed while effectively suppressing the running noise.
  • the absorption of the puncture repair liquid 41 is suppressed by the noise damper 20 having the water absorption rate calculated by the above formula (1) is not more than 25%, therefore, it is possible that a small amount of the puncture repair liquid 41 is required for puncture repair of the pneumatic tire 1 .
  • the damping rubber body 30 is formed of a rubber different from the topping rubber included in the carcass ply 6 A and the belt ply 7 A.
  • the width W 1 of the damping rubber body 30 is in a range of from 70% to 120% of the width W 2 of the belt layer 7 .
  • the water absorption rate of the noise damper 20 is limited as described above, therefore, it is possible that the effect of suppressing the cavity resonance is small as compared with a pneumatic tire provided with the noise damper having a higher water absorption rate.
  • the damping rubber body 30 described above is disposed between the carcass 6 and the belt layer 7 , therefore, the running noise is effectively suppressed. Therefore, according to the pneumatic tire 1 , it is possible that the deterioration of the uniformity of a pneumatic tire after puncture repair is suppressed while suppressing the running noise.
  • a thickness T 1 in the tire radial direction of the damping rubber body 30 is not less than 0.3 mm.
  • the thickness T 1 is set to not less than 0.3 mm, the vibration of the tread portion 2 is more effectively suppressed.
  • a maximum thickness in the tire radial direction of the damping rubber body 30 in a range of from 4% to 20% of a maximum thickness of the tread portion 2 , it is possible that the suppression of the running noise of the pneumatic tire 1 and the steering stability are obtained easily.
  • hardness H 1 of the damping rubber body 30 and hardness H 2 of the tread rubber Tg disposed on an outer side in the tire radial direction of the belt layer 7 is 0.5 ⁇ H 1 /H 2 ⁇ 1.0.
  • rubber hardness is defined as rubber hardness measured in accordance with Japanese Industrial Standard JIS-K 6253 by a type-A durometer under an environment of 23 degrees Celsius.
  • relationship between the hardness H 1 of the damping rubber body 30 and hardness H 3 of the topping rubber included in the carcass ply 6 A and the belt ply 7 A is 0.4 ⁇ H 1 /H 3 ⁇ 1.2.
  • the hardness H 1 of the damping rubber body 30 is in a range of from 30 to 73 degrees.
  • the damping rubber body 30 of hardness H 1 configured as such, it is possible that the running noise is easily suppressed and the steering stability is improved while suppressing manufacturing cost of the pneumatic tire 1 .
  • the hardness H 2 of the tread rubber Tg is in a range of from 55 to 75 degrees.
  • density of the noise damper 20 is in a range of from 10 to 40 kg/m3.
  • density of the noise damper 20 is in a range of from 10 to 40 kg/m3.
  • the noise damper 20 having the density not less than 10 kg/m3 it is possible that deterioration of the uniformity of the pneumatic tire 1 after puncture repair is suppressed.
  • the noise damper 20 having the density not more than 40 kg/m3 it is possible that the running noise in the vicinity of 250 Hz in particular is decreased without increasing the weight of the pneumatic tire 1 .
  • the volume V 1 of the noise damper 20 is in a range of from 0.4% to 30% of total volume V 2 of the tire inner cavity.
  • the volume V 1 of the noise damper 20 is apparent total volume of the noise damper 20 , which means the volume determined from the outer shape including the inner cells.
  • the total volume V 2 of the tire inner cavity is to be approximately determined by the following formula with respect to a pneumatic tire in the standard state in which the pneumatic tire is mounted on a standard rim, inflated to the standard inner pressure, and loaded with no tire load.
  • V 2 A ⁇ ( Di ⁇ Dr )/2+ Dr ⁇ n
  • A is a cross sectional area of the tire inner cavity obtained by CT scanning a tire/rim assembly in the standard state
  • Di is a maximum outer diameter of the inner cavity surface of the tire in the standard state
  • Dr is a diameter of the rim
  • n is the circumference ratio.
  • volume V 1 is less than 0.4% of the total volume V 2 , it is possible that the vibration energy of the air is not sufficiently converted. If the volume V 1 is more than 30% of the total volume v 2 , it is possible that the weight and manufacturing cost of the pneumatic tire 1 increases, and that the uniformity of the pneumatic tire 1 after the puncture repair deteriorates.
  • tensile strength of the noise damper 20 is in a range of from 70 to 115 kPa. If the tensile strength of the noise damper 20 is less than 70 kPa, it is possible that the durability of the noise damper 20 deteriorates. If the tensile strength of the noise damper 20 is more than 115 kPa, when a foreign object such as a nail sticks into the region including the noise damper 20 of the tread portion 2 , the noise damper 20 may be pulled by the foreign object, therefore, it is possible that the noise damper 20 comes off the inner cavity surface of the tread portion 2 .
  • a loss tangent tan ⁇ at 0 degree Celsius of the tread rubber Tg is not less than 0.4. Thereby, wet grip performance of the pneumatic tire 1 is improved. Therefore, by setting the volume of the grooves formed in the ground contacting surface of the tread portion 2 to be small and the like, it is possible to further reduce the running noise, for example. It is preferred that the loss tangent tan ⁇ at 70 degrees Celsius of the tread rubber Tg is not more than 0.2. Thereby, rolling resistance of the pneumatic tire 1 is suppressed and deterioration of the fuel efficiency due to inclusion of the noise damper 20 and the damping rubber body 30 is suppressed.
  • the loss tangent tan ⁇ at 0 degrees Celsius and the loss tangent tan ⁇ at 70 degrees Celsius were measured in accordance with Japanese Industrial Standard JIS-K 6394 by using a viscoelasticity spectrometer available from Iwamoto Quartz GlassLab Co., Ltd. under a condition of respective temperature (0 degrees Celsius or 70 degrees Celsius), a frequency of 10 Hz, an initial tensile strain of 10%, and an amplitude of dynamic strain of ⁇ 2%.
  • a value calculated by a following formula: (1.4 ⁇ carbon black content (phr)+silica content (phr))/sulfur content (phr) of the tread rubber Tg is not less than 20.
  • FIG. 3 shows a pneumatic tire 1 A as another embodiment of the present invention, for example.
  • the pneumatic tire 1 A is different from the pneumatic tire 1 in that the damping rubber body 30 is disposed between the belt layer 7 and the band layer 9 .
  • the configuration of the pneumatic tire 1 can be applied to the components of the pneumatic tire 1 A that are not described below.
  • the vibration of the belt layer 7 and the band layer 9 is suppressed by the damping rubber body 30 , therefore, the vibration of the tread portion 2 is suppressed eventually.
  • FIG. 4 shows a pneumatic tire 1 B as yet another embodiment of the present invention.
  • the pneumatic tire 1 B is different from the pneumatic tire 1 in that the damping rubber body 30 is arranged on an outer side in the tire radial direction of the band layer 9 .
  • the configuration of the pneumatic tire 1 can be applied to the components of the pneumatic tire 1 B that are not described below.
  • the vibration of the band layer 9 and the tread rubber Tg is suppressed by the damping rubber body 30 , therefore, the vibration of the tread portion 2 is suppressed eventually.
  • Pneumatic tires of size 165/65R18 having the basic structure shown in FIG. 1 were made by way of test according to the specification listed in Table 1, then the test tires were tested for uniformity performance and noise performance after puncture repair.
  • the specifications common to each of the Examples and the References were as follows.
  • Carbon black N220 5 (phr)
  • Zinc oxide 2 (phr)
  • the hardness of the tread rubber of the vulcanized tire was 64 degrees.
  • the maximum thickness of the tread rubber was 10 mm.
  • Zinc oxide 2 (phr)
  • the hardness of the damping rubber body of the vulcanized tire was 58 degrees.
  • the maximum thickness of the damping rubber body was 1 mm.
  • the volume was 15% of the total volume of the tire inner cavity.
  • the density was 27 kg/m3.
  • the angle of the belt cords with respect to the tire equator was 41 degrees.
  • test methods were as follows.
  • Each of the test tires was mounted on a rim of 18 ⁇ 733 and injected with puncture repair material simulating puncture repair, and then radial force variation (RFV) was measured under the condition of the inner pressure of 320 kPa in accordance with uniformity test condition of Japanese Automobile Standards Organization JASO C607:2000.
  • the evaluation speed was 10 km/h.
  • the results are indicated by an index based on Example 1 being 100, wherein the larger the numerical value, the smaller the RFV is, which is better.
  • test tires were mounted on a rim of 18 ⁇ 733 and mounted on all wheels of a test car (domestically produced FR car with displacement of 2500 cc) under the condition of the inner pressure of 320 kPa.
  • a total sound pressure (decibel) of frequencies in a range of from 100 to 200 Hz and in a range of from 200 to 300 Hz was measured by using a sound concentrating microphone attached to the center part of the backrest of the driver's seat while the test car was driven on a road for measuring road noise (rough asphalt surface road) at a speed of 60 km/h.
  • the results are indicated by an index based on Example 1 being 100, wherein the larger the numerical value, the smaller the running noise is, which is better.
  • the radial force variation (RFV) was measured by the same method as described above. The results are indicated by an index based on Example 3 being 100, wherein the larger the numerical value, the smaller the RFV is, which is better.
  • the in-car noise was measured by the same method as described above. The results are indicated by an index based on Example 3 being 100, wherein the larger the numerical value, the smaller the running noise is, which is better.
  • the in-car noise was measured by the same method as described above. The results are indicated by an index based on Example 9 being 100, wherein the larger the numerical value, the smaller the running noise is, which is better.
  • the in-car noise was measured by the same method as described above. The results are indicated by an index based on Example 13 being 100, wherein the larger the numerical value, the smaller the running noise is, which is better.
  • Manufacturing cost required to manufacture a single tire was calculated. The results are indicated by an index based on Example 13 being 100, wherein the larger the numerical value, the smaller the manufacturing cost is, which is better.
  • pneumatic tires as Examples 16 to 20 were made by way of test, and then the uniformity performance and the noise performance after puncture repair were tested.
  • the test methods were as follows.
  • the RFV was measured by the same method as described above. The results are indicated by an index based on Example 18 being 100, wherein the larger the numerical value, the smaller the RFV is, which is better.
  • the in-car noise was measured by the same method as described above. The results are indicated by an index based on Example 18 being 100, wherein the larger the numerical value, the smaller the running noise is, which is better.
  • pneumatic tires as Examples 21 to 25 were made by way of test, and then the uniformity performance and the noise performance were tested.
  • the test methods were as follows.
  • the RFV was measured by the same method as described above. The results are indicated by an index based on Example 23 being 100, wherein the larger the numerical value, the smaller the RFV is, which is better.
  • the in-car noise was measured by the same method as described above. The results are indicated by an index based on Example 23 being 100, wherein the larger the numerical value, the smaller the running noise is, which is better.
  • test tires were mounted on a rim of 18 ⁇ 7.17 and then, by using a drum testing machine, a distance until the noise damper and its vicinity were damaged was measured under the conditions of the inner pressure of 320 kPa, the tire load of 4.8 kN, and the speed of 80 km/h.
  • the results are indicated by an index based on Example 28 being 100, wherein the larger the numerical value, the higher the durability is, which is better.
  • test tires were mounted on a rim of 18 ⁇ 6.53 and punctured by rolling on a nail, then the damaged part was disassembled to measure the area of separation of the noise damper from the inner cavity surface of the tread portion due to the noise damper being pulled by the nail.
  • the results are indicated by an index based on Example 28 being 100, wherein the larger the numerical value, the higher the separation resistance performance is, which is better.
  • pneumatic tires as Examples 32 and 33 were made by way of test, and then the uniformity performance and the noise performance after puncture repair were tested.
  • the test methods were as follows.
  • the radial force variation (RFV) was measured by the same method as described above. The results are indicated by an index based on Example 1 being 100, wherein the larger the numerical value, the smaller the RFV is, which is better.
  • the in-car noise was measured by the same method as described above. The results are indicated by an index based on Example 1 being 100, wherein the larger the numerical value, the smaller the running noise is, which is better.
  • pneumatic tires as Examples 34 to 38 were made by way of test, and then the uniformity performance and the noise performance after puncture repair were tested.
  • the test methods were as follows.
  • the radial force variation (RFV) was measured by the same method as described above. The results are indicated by an index based on Example 18 being 100, wherein the larger the numerical value, the smaller the RFV is, which is better.
  • the in-car noise was measured by the same method as described above. The results are indicated by an index based on Example 18 being 100, wherein the larger the numerical value, the smaller the running noise is, which is better.
  • pneumatic tires as Examples 39 to 43 were made by way of test, and then the uniformity performance and the noise performance after puncture repair were tested.
  • the test methods were as follows.
  • the radial force variation (RFV) was measured by the same method as described above. The results are indicated by an index based on Example 23 being 100, wherein the larger the numerical value, the smaller the RFV is, which is better.
  • the in-car noise was measured by the same method as described above. The results are indicated by an index based on Example 23 being 100, wherein the larger the numerical value, the smaller the running noise is, which is better.

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JP7339503B2 (ja) * 2019-06-14 2023-09-06 横浜ゴム株式会社 空気入りタイヤ
EP3831620B1 (en) 2019-12-04 2023-04-19 The Goodyear Tire & Rubber Company A pneumatic tire
KR102318398B1 (ko) * 2019-12-27 2021-10-28 넥센타이어 주식회사 타이어
CN113447635B (zh) * 2021-05-11 2023-09-29 江西农业大学 一种盆栽类土壤不同深度温室气体释放速率测定装置
CN113771557B (zh) * 2021-09-07 2023-06-30 安徽佳通乘用子午线轮胎有限公司 一种能够降低空腔共鸣音的轮胎及其生产方法

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