WO2018105421A1 - 空気入りタイヤ - Google Patents
空気入りタイヤ Download PDFInfo
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- WO2018105421A1 WO2018105421A1 PCT/JP2017/042349 JP2017042349W WO2018105421A1 WO 2018105421 A1 WO2018105421 A1 WO 2018105421A1 JP 2017042349 W JP2017042349 W JP 2017042349W WO 2018105421 A1 WO2018105421 A1 WO 2018105421A1
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- pneumatic tire
- disposed
- belt layer
- tire
- tire according
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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
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- 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
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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
- 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
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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
- 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
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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
- B60C2011/0025—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 in which a noise control body is disposed on a lumen surface of a tread portion.
- Patent Document 1 a pneumatic tire in which a sound control body made of a sponge material is arranged on a lumen surface of a tread portion is known.
- a repair method when a pneumatic tire is punctured a method of sealing a puncture hole by spreading a puncture repair solution containing a puncture sealant over the inner surface of the lumen is known.
- puncture repair using puncture repair fluid it is necessary to distribute the puncture repair fluid to the inner surface of the repair location where the through hole is formed. It is rotated and filled with puncture repair liquid in that state.
- the present invention has been devised in view of the above circumstances, and its main object is to provide a pneumatic tire capable of suppressing the influence on uniformity after puncture repair while suppressing running noise.
- the present invention is a pneumatic tire comprising a carcass that extends from a tread portion through a sidewall portion to a bead core of a bead portion, and a belt layer that is disposed radially outside the carcass and inside the tread portion, It has a porous sound absorber disposed on the inner surface of the tread portion, and the water absorption rate calculated by the following formula (1) of the sound absorber is 10 to 25%. .
- Water absorption rate (%) Weight change before and after immersion (g) / 50% compression volume (cm 3 ) ⁇ 100 (1)
- the density of the sound damper is 10 to 40 kg / m 3 .
- the volume V1 of the sound control body is 0.4 to 30% of the total volume V2 of the tire lumen.
- the tensile strength of the sound damper is 70 to 115 kPa.
- the loss tangent tan ⁇ at 0 ° C. of the tread rubber disposed on the outer side in the tire radial direction of the belt layer is 0.4 or more and the loss tangent at 70 ° C. It is desirable that tan ⁇ is 0.2 or less.
- the tread rubber disposed on the outer side in the tire radial direction of the belt layer is (1.4 ⁇ carbon black content (phr) + silica content (phr)) / sulfur content. It is desirable that the rubber composition has a quantity (phr) value of 20 or more.
- the pneumatic tire further includes a vibration-damping rubber body disposed inside the tread portion.
- a width W1 of the damping rubber body in the tire axial direction is 60 to 130% of a width W2 of the belt layer in the tire axial direction.
- the damping rubber body is disposed between the carcass and the belt layer.
- the pneumatic tire has a band layer disposed radially outside the belt layer and inside the tread portion, and the vibration-damping rubber body is interposed between the belt layer and the band layer. It is desirable to be arranged.
- the pneumatic tire has a band layer arranged radially outside the belt layer and inside the tread portion, and the damping rubber body is arranged outside the band layer in the tire radial direction. It is desirable to be arranged.
- a thickness of the vibration damping rubber body in a tire radial direction is 0.3 mm or more.
- the relationship between the hardness H1 of the damping rubber body and the hardness H2 of the tread rubber disposed on the outer side in the tire radial direction of the belt layer is 0.5 ⁇ ⁇ H1 / H2 ⁇ 1.0 is desirable.
- the noise control body is disposed on the inner surface of the tread, cavity resonance in the tire lumen is suppressed, and running noise of the pneumatic tire is reduced.
- the water absorption rate calculated by the above formula (1) of the sound control body is 10 to 25%, absorption of the puncture repair liquid by the sound control body is suppressed. Therefore, the puncture repair liquid does not concentrate on the sound damping body at the repair location, but is easily dispersed uniformly in the tire circumferential direction, and the uniformity after the puncture repair (that is, the pneumatic tire, the sound damping body, and the puncture repair) Since deterioration of weight uniformity including liquid can be prevented, traveling noise can be effectively suppressed.
- FIG. 1 is a tire meridian cross-sectional view including a tire rotation axis in a normal state of the pneumatic tire 1 of the present embodiment.
- the normal state is a no-load state in which the tire is assembled on the normal rim and the normal internal pressure is filled.
- the dimensions and the like of each part of the tire are values measured in this normal state.
- the “regular rim” is a rim determined for each tire in the standard system including the standard on which the tire is based. For example, in the case of JATMA, “standard rim”, in the case of TRA, “Design Rim”, ETRTO If so, Me “Measuring Rim”.
- Regular internal pressure is the air pressure that each standard defines for each tire in the standard system including the standard on which the tire is based.
- JATMA “maximum air pressure”, for TRA, “TIRE LOAD LIMITS” The maximum value described in AT “VARIOUS” COLD “INFLATION” PRESSURES ”, or“ INFLATION PRESSURE ”in ETRTO.
- the pressure is uniformly set to 200 kPa in consideration of the actual use frequency.
- a pneumatic tire (hereinafter sometimes simply referred to as “tire”) 1 according to the present embodiment includes a carcass 6 that extends from a tread portion 2 to a bead core 5 of a bead portion 4 through a sidewall portion 3. And a belt layer 7 disposed on the outer side in the tire radial direction of the carcass 6 and on the inner side of the tread portion 2.
- a passenger car is shown.
- the carcass 6 is composed of, for example, one carcass ply 6A.
- This carcass ply 6A is provided with a series of folded portions 6b that are locked to the bead core 5 by folding the bead core 5 from the inner side to the outer side in the tire axial direction at both ends of the body portion 6a straddling the bead cores 5 and 5. It is.
- an organic fiber cord such as aromatic polyamide or rayon is adopted as the carcass cord.
- the carcass cord is arranged at an angle of 70 to 90 ° with respect to the tire equator C, for example.
- the carcass ply 6A is configured by covering a plurality of carcass cords with a topping rubber.
- a bead apex rubber 8 extending in a tapered shape from the bead core 5 toward the outer side in the tire radial direction is disposed between the main body portion 6a and the folded portion 6b.
- a tread rubber Tg that forms a ground contact surface On the outside of the carcass 6, a tread rubber Tg that forms a ground contact surface, a side wall rubber Sg that forms the outer surface of the side wall portion 3, a bead rubber Bg that forms the outer surface of the bead portion 4, and the like are disposed.
- an inner liner rubber Lg or the like for maintaining the tire internal pressure is disposed inside the carcass 6.
- the belt layer 7 includes two belt plies 7A and 7B in which the belt cords are inclined with respect to the tire equator C at an angle of, for example, 15 to 45 °, and the belt cords cross each other.
- the tire is overlapped in the tire radial direction.
- steel, aramid, rayon, or the like is suitably used for the belt cord.
- the belt plies 7A and 7B are configured by covering a plurality of belt cords with a topping rubber.
- the band layer 9 is disposed outside the belt layer 7 in the tire radial direction.
- the band layer 9 includes a band ply 9A in which an organic fiber band cord, in this example, a nylon cord is spirally wound at an angle of 10 degrees or less, preferably 5 degrees or less with respect to the tire circumferential direction.
- the pneumatic tire 1 has a sound control body 20 disposed on the inner surface of the tread portion 2.
- the sound control body 20 is made of, for example, a porous sponge material.
- the sponge material is a sponge-like porous structure, for example, a web in which animal fibers, plant fibers, or synthetic fibers are entangled and integrally connected in addition to a so-called sponge having open cells in which rubber or synthetic resin is foamed. It shall be included.
- the “porous structure” includes not only open cells but also those having closed cells.
- an open-cell sponge material made of polyurethane is used for the sound control body 20 of this example.
- the sponge material as described above reduces the sound (cavity resonance energy) by converting the vibration energy of the air that vibrates the surface or the inner porous portion into heat energy, thereby reducing the noise (running noise of the pneumatic tire 1). Reduce.
- the sponge material since the sponge material is easily deformed such as contraction and bending, it does not substantially affect the deformation of the tire during running. For this reason, it can prevent that steering stability deteriorates.
- the specific gravity of the sponge material is very small, it is possible to prevent deterioration of the weight balance of the tire.
- the sponge material is preferably an ether polyurethane sponge, ester polyurethane sponge, synthetic resin sponge such as polyethylene sponge, chloroprene rubber sponge (CR sponge), ethylene propylene rubber sponge (EDPM sponge), nitrile rubber sponge (NBR sponge), etc.
- a rubber sponge can be suitably used, and a polyurethane or polyethylene-based sponge including an ether polyurethane sponge is particularly preferable from the viewpoints of sound damping properties, light weight, foaming controllability, durability, and the like.
- the noise control body 20 has a long band 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, the outer end portions in the circumferential direction can be abutted with each other to form a substantially annular shape, and the outer end portions may be spaced apart in the circumferential direction.
- the noise control body 20 has substantially the same cross-sectional shape at each position in the circumferential direction excluding the outer end portion.
- As the cross-sectional shape a flat and oblong shape having a small height with respect to the width in the tire axial direction is preferable in order to prevent falling or deformation during traveling.
- the concave groove 21 can increase the surface area of the sound control body 20 and absorb more resonance energy, and can improve heat dissipation and suppress the temperature rise of the sponge material.
- FIG. 2 shows the pneumatic tire 1 after puncture repair is performed using the puncture repair liquid.
- the through hole 40 formed in the tread portion 2 is filled with the puncture repair liquid 41 and the through hole 40 is sealed.
- the water absorption rate of the sound control body 20 is 10 to 25%.
- the water absorption rate of the noise control body 20 is calculated by the following equation (1).
- Water absorption rate (%) Weight change before and after immersion (g) / 50% compression volume (cm 3 ) ⁇ 100 (1)
- a test piece having a length of 50 mm, a width of 50 mm, and a thickness of 20 mm is used for measuring the weight change before and after the immersion of the noise control body 20.
- the test piece was compressed 50% in the thickness direction, and the weight after being immersed in water at a water temperature of 20 ° C. and 10 cm below the water surface for 24 hours was measured. Since the volume at the time of 50% compression can be calculated from the above dimensions of the test piece, the water absorption (%) is calculated from the measured weight according to the above equation (1).
- the said volume of a test piece is an apparent volume similarly to the volume V1 mentioned later.
- the test piece whose weight and the like are measured is not limited to the test piece having the above dimensions.
- the dimensions of the test piece can be changed as appropriate according to the size, shape, and the like of the sound control body 20.
- the noise control body 20 is disposed on the inner surface of the tread portion 2, cavity resonance in the tire lumen is suppressed, and the running noise of the pneumatic tire 1 is reduced.
- the water absorption calculated by the above formula (1) of the sound control body 20 is 10% or more.
- Such a sound damping body 20 has a great effect of absorbing more resonance energy and suppressing cavity resonance by the bubbles communicating with the surface of the sound damping body 20.
- the water absorption calculated by the said Formula (1) of the noise suppression body 20 is 25% or less.
- a sound control body 20 suppresses local absorption of the puncture repair liquid 41. Therefore, the rotation of the tire during traveling facilitates the puncture repair liquid 41 to be evenly distributed over the entire circumference in the tire circumferential direction without concentrating on the sound damping body 20 at the repair location. Thereby, the influence on the force variation after puncture repair is suppressed, and the deterioration of the uniformity of the pneumatic tire 1 can be suppressed.
- Uniformity here refers to the uniformity of weight including the pneumatic tire 1, the sound damping body 20, and the puncture repair liquid 41. When such uniformity is impaired, there is a problem that traveling noise tends to increase.
- the present invention suppresses cavity resonance as compared with a pneumatic tire provided with a sound absorption body having a higher water absorption rate. The effect may be reduced.
- the damping rubber body 30 is disposed inside the tread portion 2.
- the damping rubber body 30 is disposed between the carcass 6 and the belt layer 7.
- the width W1 in the tire axial direction of the damping rubber body 30 is 60 to 130% of the width W2 in the tire axial direction of the belt layer.
- Such a vibration-damping rubber body 30 suppresses the vibration of the tread portion 2 without causing an increase in the weight of the pneumatic tire 1, and contributes to a reduction in traveling noise particularly in the vicinity of 160 Hz. Thereby, it becomes possible to suppress the deterioration of the uniformity of the pneumatic tire 1 after the puncture repair while effectively suppressing the running noise.
- the puncture of the pneumatic tire 1 is performed with a small amount of the puncture repair liquid 41. Repair is possible.
- the damping rubber body 30 is made of a rubber different from the topping rubber included in the carcass ply 6A and the belt ply 7A.
- a more desirable width W1 of the damping rubber body 30 is 70 to 120% of the width W2 of the belt layer 7.
- the effect of suppressing the cavity resonance is lower than that of a pneumatic tire provided with a sound absorption material having a higher water absorption rate.
- the vibration damping rubber body 30 described above is disposed between the carcass 6 and the belt layer 7, traveling noise is effectively suppressed. Therefore, according to the pneumatic tire 1, it is possible to suppress deterioration of uniformity of the pneumatic tire after puncture repair while suppressing running noise.
- the thickness T1 of the damping rubber body 30 in the tire radial direction is preferably 0.3 mm or more.
- the vibration of the tread portion 2 is further effectively suppressed.
- the maximum thickness of the damping rubber body 30 in the radial direction of the tire to 4 to 20% of the maximum thickness of the tread portion 2, it is possible to achieve both suppression of traveling noise and stable driving performance of the pneumatic tire 1. It can be easily achieved.
- the relationship between the hardness H1 of the damping rubber body 30 and the hardness H2 of the tread rubber Tg disposed on the outer side in the tire radial direction of the belt layer 7 is preferably 0.5 ⁇ H1 / H2 ⁇ 1.0.
- “rubber hardness” is rubber hardness according to durometer type A in an environment of 23 ° C. in accordance with JIS-K6253.
- the vibration damping rubber body 30 having the hardness H1 further effectively suppresses the vibration of the tread portion 2 while ensuring the durability of the tread portion 2.
- the relationship between the hardness H1 of the damping rubber body 30 and the hardness H3 of the topping rubber included in the carcass ply 6A and the belt ply 7A is preferably 0.4 ⁇ H1 / H3 ⁇ 1.2.
- the vibration damping rubber body 30 having the hardness H1 further effectively suppresses the vibration of the tread portion 2 while ensuring the durability of the tread portion 2.
- More desirable hardness H1 of the vibration damping rubber body 30 is 30 ° to 73 °. With the vibration damping rubber body 30 having such hardness H1, it is possible to easily suppress running noise and improve steering stability performance while suppressing the manufacturing cost of the pneumatic tire 1.
- a more desirable hardness H2 of the more specific tread rubber Tg is 55 ° to 75 °. With the tread rubber Tg having such hardness H2, the rigidity of the tread portion 2 is optimized, and the steering stability performance can be improved.
- the density of the sound control body 20 is preferably 10 to 40 kg / m 3 .
- the sound control body 20 having a density of 10 kg / m 3 or more it is possible to suppress deterioration of the uniformity of the pneumatic tire 1 after puncture repair.
- the noise control body 20 having a density of 40 kg / m 3 or less makes it possible to reduce running noise particularly in the vicinity of 250 Hz without increasing the weight of the pneumatic tire 1.
- the volume V1 of the sound control body 20 is preferably 0.4 to 30% of the total volume V2 of the tire lumen.
- the volume V1 of the sound control body 20 is an apparent total volume of the sound control body 20, and means a volume determined from an external shape including bubbles inside.
- the total volume V2 of the tire lumen is approximately calculated by the following equation in a normal state of no load in which a pneumatic tire is assembled on a normal rim and filled with a normal internal pressure.
- V2 A * ⁇ (Di-Dr) / 2 + Dr ⁇ * ⁇
- A is the cross-sectional area of the tire lumen obtained by CT scanning of the tire / rim assembly in the normal state
- Dr ⁇ is the maximum outer surface of the tire lumen in the normal state.
- the diameter, “Dr” is the rim diameter, and “ ⁇ ” is the circumference.
- volume V1 is less than 0.4% of the total volume V2, the vibration energy of the air may not be converted sufficiently.
- the volume V1 exceeds 30% of the total volume V2, the weight and manufacturing cost of the pneumatic tire 1 are increased, and the uniformity of the pneumatic tire 1 after puncture repair may be deteriorated.
- the tensile strength of the noise control body 20 is desirably 70 to 115 kPa. When the tensile strength of the noise damper 20 is less than 70 kPa, the durability of the noise damper 20 may be reduced. When the tensile strength of the sound control body 20 exceeds 115 kPa, when a foreign object such as a nail is stuck in the region including the sound control body 20 of the tread portion 2, the sound control body 20 is pulled by the foreign material and the inside of the tread portion 2 There is a risk of peeling from the cavity surface.
- the loss tangent tan ⁇ at 0 ° C. of the tread rubber Tg is desirably 0.4 or more. Thereby, the wet grip performance of the pneumatic tire 1 is improved. Therefore, for example, the travel noise can be further reduced by setting the volume of the groove formed on the ground contact surface of the tread portion 2 to be small.
- the loss tangent tan ⁇ at 70 ° C. of the tread rubber Tg is preferably 0.2 or less. Thereby, rolling resistance of the pneumatic tire 1 is suppressed, and deterioration of fuel efficiency performance due to the provision of the sound damping body 20 and the vibration damping rubber body 30 is suppressed.
- the tread rubber Tg preferably has a value of (1.4 ⁇ carbon black content (phr) + silica content (phr)) / sulfur content (phr) of 20 or more.
- abrasion resistance performance improves. Therefore, for example, the driving noise can be further reduced by setting a shallow groove formed on the ground contact surface of the tread portion 2. Further, even when uneven distribution occurs in the puncture repair liquid, the occurrence of uneven wear is suppressed.
- the present invention is not limited to the above-mentioned specific embodiment, and is carried out by changing it to various modes.
- FIG. 3 shows a pneumatic tire 1A which is another embodiment of the present invention.
- the pneumatic tire 1 ⁇ / b> A differs 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 structure of the pneumatic tire 1 can be employ
- vibrations of the belt layer 7 and the band layer 9 are suppressed by the vibration damping rubber body 30, and thus vibrations of the tread portion 2 are suppressed.
- FIG. 4 shows a pneumatic tire 1B which is still another embodiment of the present invention.
- the pneumatic tire 1B is different from the pneumatic tire 1 in that the damping rubber body 30 is disposed on the outer side of the band layer 9 in the tire radial direction.
- the structure of the pneumatic tire 1 may be employ
- the vibration suppression rubber body 30 suppresses vibrations of the band layer 9 and the tread rubber Tg, and consequently suppresses vibrations of the tread portion 2.
- a pneumatic tire of size 165 / 65R18 having the basic structure of FIG. 1 was prototyped based on the specifications in Table 1, and tested for uniformity performance and noise performance after puncture repair.
- the specifications common to each example and comparative example are as follows.
- (1) Tread rubber and compounding are as follows.
- Natural rubber 15 (phr) SBR1 (bound styrene content: 28%, vinyl group content 60%, glass transition point -25 ° C., terminal modification): 45 (phr) SBR2 (bound styrene content: 35%, vinyl group content 45%, glass transition point -25 ° C., terminal modification): 25 (phr) BR (BR150B, Ube): 15 (phr) Carbon black N220: 5 (phr) Silica (VN3): 35 (phr) Silica (1115MP): 20 (phr) Silane coupling agent Si266: 4 (phr) Resin (Arizona Chemical SYLVARES SA85): 8 (phr) Oil: 4 (phr) Wax: 1.5 (phr) Anti-aging agent (6C): 3 (phr) Stearic acid: 3 (phr) Zinc oxide: 2 (phr) Sulfur: 2 (phr) Vulcan
- Each sample tire is mounted on a rim 18x7 JJ, filled with puncture repair materials assuming puncture repair, and then subjected to radial force according to JASO C607: 2000 uniformity test conditions at an internal pressure of 320 kPa. Variation (RFV) was measured.
- the evaluation speed is 10 km / h.
- the result is represented by an index with Example 1 as 100, and the larger the value, the smaller the RFV and the better.
- Radial force variation was measured by the same method as above. The result is represented by an index with Example 3 as 100, and the larger the numerical value, the smaller the RFV and the better.
- Vehicle interior noise was measured by the same method as above. The result is expressed by an index with Example 3 as 100, and the larger the numerical value, the smaller the traveling noise and the better.
- Vehicle interior noise was measured by the same method as above. The result is expressed by an index with Example 9 as 100, and the larger the value, the smaller the traveling noise and the better.
- ⁇ Steering stability> The vehicle used in the noise performance test was run on a dry asphalt test course, and characteristics related to steering response, rigidity, grip, etc. were evaluated by sensory evaluation of the driver. Evaluation is made with a score of Example 9 being 100, and the larger the value, the better.
- Vehicle interior noise was measured by the same method as above.
- the result is represented by an index with Example 13 as 100, and the larger the numerical value, the smaller the traveling noise and the better.
- Vehicle interior noise was measured by the same method as above. The result is represented by an index with Example 18 as 100, and the larger the value, the smaller the running noise and the better.
- Vehicle interior noise was measured by the same method as above.
- the result is represented by an index with Example 23 as 100, and the larger the numerical value, the smaller the traveling noise and the better.
- pneumatic tires of Examples 32 to 33 were prototyped and tested for uniformity performance and noise performance after puncture repair.
- the test method is as follows.
- Radial force variation was measured by the same method as above. The result is represented by an index with Example 1 as 100, and the larger the value, the smaller the RFV and the better.
- Vehicle interior noise was measured by the same method as above. The result is represented by an index with Example 1 as 100, and the larger the numerical value, the smaller the traveling noise and the better.
- Vehicle interior noise was measured by the same method as above. The result is represented by an index with Example 18 as 100, and the larger the value, the smaller the running noise and the better.
- Vehicle interior noise was measured by the same method as above.
- the result is represented by an index with Example 23 as 100, and the larger the numerical value, the smaller the traveling noise and the better.
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Abstract
Description
吸水率(%)= 浸漬前後の重量変化(g)/50%圧縮時の体積(cm3)
×100 (1)
図1は、本実施形態の空気入りタイヤ1の正規状態におけるタイヤ回転軸を含むタイヤ子午線断面図である。ここで、正規状態とは、タイヤを正規リムにリム組みし、かつ、正規内圧を充填した無負荷の状態である。以下、特に言及されない場合、タイヤの各部の寸法等はこの正規状態で測定された値である。
吸水率(%)= 浸漬前後の重量変化(g)/50%圧縮時の体積(cm3)
×100 (1)
V2=A×{(Di-Dr)/2+Dr}×π
ここで、上記式中、"A " は前記正規状態のタイヤ・リム組立体をCTスキャニングして得られるタイヤ内腔の横断面積、" Di " は正規状態でのタイヤの内腔面の最大外径、" Dr " はリム径、" π " は円周率である。
(1)トレッドゴム
・配合は以下の通りである。
天然ゴム(TSR20):15(phr)
SBR1(結合スチレン量:28%、ビニル基含有量60%、ガラス転移点-25℃、末端変性):45(phr)
SBR2(結合スチレン量:35%、ビニル基含有量45%、ガラス転移点-25℃、末端変性):25(phr)
BR(BR150B、宇部):15(phr)
カーボンブラックN220:5(phr)
シリカ(VN3):35(phr)
シリカ(1115MP):20(phr)
シランカップリング剤Si266:4(phr)
レジン(アリゾナケミカル社 SYLVARES SA85):8(phr)
オイル:4(phr)
Wax:1.5(phr)
老化防止剤(6C):3(phr)
ステアリン酸:3(phr)
酸化亜鉛:2(phr)
硫黄:2(phr)
加硫促進剤(NS):2(phr)
加硫促進剤(DPG):2(phr)
・加硫後のタイヤにおけるトレッドゴムの硬度は、64゜である。
・トレッドゴムの最大厚みは、10mmである。
(2)制振ゴム体
・配合は以下の通りである。
天然ゴム(TSR20):65(phr)
SBR(Nipol 1502):35(phr)
カーボンブラックN220:52(phr)
オイル:15(phr)
ステアリン酸:1.5(phr)
酸化亜鉛:2(phr)
硫黄:3(phr)
加硫促進剤(CZ):1(phr)
・加硫後のタイヤにおける制振ゴム体の硬度は、58゜である。
・制振ゴム体の最大厚みは、1mmである。
(3)制音体
・体積は、タイヤ内腔の全体積の15%である。
・密度は27kg/m3である。
(4)ベルトコード
・タイヤ赤道に対するベルトコードの角度は、41゜である。
テスト方法は、以下の通りである。
各試供タイヤが、リム18×7JJに装着され、パンク修理を想定してパンク修理材が充填された後、内圧320kPaの条件にて、JASO C607:2000のユニフォミティ試験条件に準拠して、ラジアルフォースバリエーション(RFV)が測定された。評価速度は、10km/hである。結果は、実施例1を100とする指数で表され、数値が大きいほどRFVが小さく良好である。
各試供タイヤが、リム18×7JJに装着され、内圧320kPaの条件にて車両(国産2500ccのFR車)の全輪に装着された。上記車両がロードノイズ計測路(アスファルト粗面路)を速度60km/h で走行したときの周波数100~200Hz及び200~300Hzの全音圧(デシベル)が、運転席の背もたれの中央部に取り付けられた集音マイクによって測定された。結果は、実施例1を100とする指数で表され、数値が大きいほど走行ノイズが小さく良好である。
上記と同じ方法により、ラジアルフォースバリエーション(RFV)が測定された。結果は、実施例3を100とする指数で表され、数値が大きいほどRFVが小さく良好である。
上記と同じ方法により、車内騒音が測定された。結果は、実施例3を100とする指数で表され、数値が大きいほど走行ノイズが小さく良好である。
上記と同じ方法により、車内騒音が測定された。結果は、実施例9を100とする指数で表され、数値が大きいほど走行ノイズが小さく良好である。
ノイズ性能のテストで使用した車両を用い、ドライアスファルトのテストコースを
走行し、ハンドル応答性、剛性感、グリップ等に関する特性がドライバーの官能評価により評価された。評価は、実施例9を100とする評点でされ、数値が大きいほど良好である。
上記と同じ方法により、車内騒音が測定された。結果は、実施例13を100とする指数で表され、数値が大きいほど走行ノイズが小さく良好である。
タイヤ1本を製造するのに要した製造コストが計算された。結果は、実施例13を100とする指数で表され、数値が大きいほど製造コストが小さく良好である。
上記と同じ方法により、RFVが測定された。結果は、実施例18を100とする指数で表され、数値が大きいほどRFVが小さく良好である。
上記と同じ方法により、車内騒音が測定された。結果は、実施例18を100とする指数で表され、数値が大きいほど走行ノイズが小さく良好である。
上記と同じ方法により、RFVが測定された。結果は、実施例23を100とする指数で表され、数値が大きいほどRFVが小さく良好である。
上記と同じ方法により、車内騒音が測定された。結果は、実施例23を100とする指数で表され、数値が大きいほど走行ノイズが小さく良好である。
各試供タイヤが、リム18×7JJに装着され、ドラム試験機を用いて、内圧320kPa、荷重4.8kN、速度80km/hの条件下で、制音体及びその近傍が損傷するまでの距離が測定された。結果は、実施例28の値を100とする指数で表示されている。評価は、数値が大きいほど耐久性能が高く良好である。
リム18×6.5Jに装着された各試供タイヤが釘踏みによってパンクされ、その損傷箇所を解体することにより、釘によって引っ張られた制音体が、トレッド部の内腔面から剥がれている面積が測定された。結果は、実施例28の値を100とする指数で表示され、評価は、数値が大きいほど耐剥がれ性能が高く良好である。
上記と同じ方法により、ラジアルフォースバリエーション(RFV)が測定された。結果は、実施例1を100とする指数で表され、数値が大きいほどRFVが小さく良好である。
上記と同じ方法により、車内騒音が測定された。結果は、実施例1を100とする指数で表され、数値が大きいほど走行ノイズが小さく良好である。
上記と同じ方法により、ラジアルフォースバリエーション(RFV)が測定された。結果は、実施例18を100とする指数で表され、数値が大きいほどRFVが小さく良好である。
上記と同じ方法により、車内騒音が測定された。結果は、実施例18を100とする指数で表され、数値が大きいほど走行ノイズが小さく良好である。
上記と同じ方法により、ラジアルフォースバリエーション(RFV)が測定された。結果は、実施例23を100とする指数で表され、数値が大きいほどRFVが小さく良好である。
上記と同じ方法により、車内騒音が測定された。結果は、実施例23を100とする指数で表され、数値が大きいほど走行ノイズが小さく良好である。
2 トレッド部
3 サイドウォール部
4 ビード部
5 ビードコア
6 カーカス
20 制音体
30 制振ゴム体
Claims (13)
- トレッド部からサイドウォール部を経てビード部のビードコアに至るカーカスと、
前記カーカスの半径方向外側かつ前記トレッド部の内部に配されるベルト層とを備えた空気入りタイヤであって、
前記トレッド部の内腔面に配された多孔質状の制音体を有し、
前記制音体の下記式(1)によって計算される吸水率が10~25%であることを特徴とする空気入りタイヤ。
吸水率(%)= 浸漬前後の重量変化(g)/50%圧縮時の体積(cm3)
×100 (1) - 前記制音体の密度は、10~40kg/m3である請求項1記載の空気入りタイヤ。
- 前記制音体の体積V1は、タイヤ内腔の全体積V2の0.4~30%である請求項1又は2に記載の空気入りタイヤ。
- 前記制音体の引張強さは、70~115kPaである請求項1乃至3のいずれかに記載の空気入りタイヤ。
- 前記ベルト層のタイヤ半径方向の外側に配されたトレッドゴムの0℃での損失正接tanδは、0.4以上であり、かつ、70℃での損失正接tanδは、0.2以下である請求項1乃至4のいずれかに記載の空気入りタイヤ。
- 前記ベルト層のタイヤ半径方向の外側に配されたトレッドゴムは、(1.4×カーボンブラック含有量(phr)+シリカ含有量(phr))/硫黄含有量(phr)の値が20以上のゴム組成体である請求項1乃至5のいずれかに記載の空気入りタイヤ。
- 前記トレッド部の内部に配された制振ゴム体をさらに有する請求項1乃至6のいずれかに記載の空気入りタイヤ。
- 前記制振ゴム体のタイヤ軸方向の幅W1は、前記ベルト層のタイヤ軸方向の幅W2の60~130%である請求項7記載の空気入りタイヤ。
- 前記制振ゴム体は、前記カーカスと前記ベルト層の間に配されている請求項7又は8に記載の空気入りタイヤ。
- 前記ベルト層の半径方向外側かつ前記トレッド部の内部に配されるバンド層を有し、
前記制振ゴム体は、前記ベルト層と前記バンド層の間に配されている請求項7又は8に記載の空気入りタイヤ。 - 前記ベルト層の半径方向外側かつ前記トレッド部の内部に配されるバンド層を有し、
前記制振ゴム体は、前記バンド層のタイヤ半径方向の外側に配されている請求項7又は8に記載の空気入りタイヤ。 - 前記制振ゴム体のタイヤ半径方向の厚さは、0.3mm以上である請求項7乃至11のいずれかに記載の空気入りタイヤ。
- 前記制振ゴム体の硬度H1と前記ベルト層のタイヤ半径方向の外側に配されたトレッドゴムの硬度H2との関係は、0.5 ≦ H1/H2 ≦ 1.0である請求項7乃至12のいずれかに記載の空気入りタイヤ。
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US15/781,968 US20190299722A1 (en) | 2016-12-07 | 2017-11-27 | Pneumatic tire |
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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 |
CN111332076A (zh) * | 2020-03-30 | 2020-06-26 | 正新橡胶(中国)有限公司 | 一种降噪轮胎及其制造工艺和一种车轮 |
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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- 2017-11-27 KR KR1020187012292A patent/KR101940965B1/ko active IP Right Grant
- 2017-11-27 JP JP2018510132A patent/JP6481080B2/ja active Active
- 2017-11-27 CN CN201780003738.5A patent/CN109070632B/zh active Active
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JP6481080B2 (ja) | 2019-03-13 |
EP3406461B1 (en) | 2020-08-26 |
US20200238768A1 (en) | 2020-07-30 |
US20190299722A1 (en) | 2019-10-03 |
JPWO2018105421A1 (ja) | 2018-12-06 |
CN109070632B (zh) | 2020-11-20 |
KR101940965B1 (ko) | 2019-01-21 |
CN109070632A (zh) | 2018-12-21 |
EP3406461A1 (en) | 2018-11-28 |
KR20180080213A (ko) | 2018-07-11 |
US11312191B2 (en) | 2022-04-26 |
EP3406461A4 (en) | 2019-07-24 |
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