WO2014073157A1 - タイヤ - Google Patents
タイヤ Download PDFInfo
- Publication number
- WO2014073157A1 WO2014073157A1 PCT/JP2013/005938 JP2013005938W WO2014073157A1 WO 2014073157 A1 WO2014073157 A1 WO 2014073157A1 JP 2013005938 W JP2013005938 W JP 2013005938W WO 2014073157 A1 WO2014073157 A1 WO 2014073157A1
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- WO
- WIPO (PCT)
- Prior art keywords
- radial direction
- tire
- tire radial
- paint layer
- outermost end
- Prior art date
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Classifications
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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
- B60C1/0025—Compositions of the sidewalls
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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
- B60C13/00—Tyre sidewalls; Protecting, decorating, marking, or the like, thereof
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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
- B60C13/00—Tyre sidewalls; Protecting, decorating, marking, or the like, thereof
- B60C13/001—Decorating, marking or the like
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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
- B60C13/00—Tyre sidewalls; Protecting, decorating, marking, or the like, thereof
- B60C13/04—Tyre sidewalls; Protecting, decorating, marking, or the like, thereof having annular inlays or covers, e.g. white sidewalls
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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
- B60C13/00—Tyre sidewalls; Protecting, decorating, marking, or the like, thereof
- B60C13/04—Tyre sidewalls; Protecting, decorating, marking, or the like, thereof having annular inlays or covers, e.g. white sidewalls
- B60C2013/045—Tyre sidewalls; Protecting, decorating, marking, or the like, thereof having annular inlays or covers, e.g. white sidewalls comprising different sidewall rubber layers
Definitions
- This invention relates to a tire provided with a paint layer exposed on at least a part of the outer surface of the sidewall portion.
- Tires in which a decorative layer or the like is formed on the outer surface of the side portion by providing a paint layer on the outer surface of the side portion of the tire are widely used.
- the decorative portion is contaminated by bleeding of the anti-aging agent contained in the surrounding rubber, and the decorative portion is prevented from being discolored.
- a technique is known in which a non-fouling or slightly fouling sidewall inner layer rubber that does not contain an anti-aging agent is disposed to isolate the decorative portion from the side wall rubber containing the anti-aging agent.
- the decorative portion in order to improve the visibility of the decorative portion, it is preferable to dispose the decorative portion on the outer side in the tire radial direction from the tire maximum width position Pw shown in FIG.
- the state of distortion (deformation) of the sidewall portion of the tire during tire rolling is exaggerated and shown in phantom in FIG.
- the amount of distortion of the tire during load rolling peaks near the tire maximum width position Pw and decreases toward the inside in the tire radial direction from the tire maximum width position Pw. Therefore, in order to improve the visibility of the decorative portion, when the decorative portion is arranged up to the vicinity of the tire maximum width position, there is a problem that peeling tends to occur particularly at the outermost end in the tire radial direction of the decorative portion.
- the sidewall portion has been thinned to reduce rolling resistance, and the tire has been flattened to improve cornering performance.
- the distortion generated in the sidewall portion becomes larger, and the above-described problems become more remarkable.
- An object of the present invention is to solve the above-described problems, and provides a tire that improves the visibility of a paint layer while preventing contamination of the paint layer with an anti-aging agent and peeling of the paint layer. It is intended to do.
- the tire according to the present invention includes a tread portion that is in contact with a road surface, a sidewall portion that is provided continuously to the tread portion, and a bead portion that is continuous to a tire radial direction inner side of the sidewall portion, and at least the sidewall portion is provided.
- a tire comprising, in part, a pollution-preventing rubber layer that does not contain an anti-aging agent, and a paint layer that is adjacent to the pollution-preventing rubber layer and exposed on the outer surface of the sidewall portion, the paint layer
- the outermost end in the tire radial direction of the tire is separated from the bead toe in the radial direction of the tire by 65% or more of the tire cross-section height, and the outermost end in the tire radial direction of the anti-contamination rubber layer is It is characterized by being positioned on the outer side in the tire radial direction from the outer end.
- the outermost position in the tire radial direction of the paint layer is measured in a no-load state in which the tire is mounted on an applicable rim and filled with a predetermined internal pressure unless otherwise specified.
- the “tire cross section height” refers to 1 ⁇ 2 of the difference between the outer diameter of the tire and the rim diameter of the applicable rim.
- the “applicable rim” is a rim in which an industrial standard effective for the area where the tire is produced or used is determined for each tire.
- the “predetermined internal pressure” refers to the filling air pressure (maximum air pressure) corresponding to the maximum load capacity of the tire, which is specified according to the tire size in the above-mentioned standards such as JATMA.
- the air can be replaced with nitrogen gas or other inert gas.
- the “tread ground contact end” means that the tire surface in the tire width direction cross section when the load of the maximum load capacity is applied to the tire assembled to the applicable rim is the ground surface. The outermost point in the tire width direction of the surface in contact with the tire.
- the visibility of the paint layer can be improved while preventing the paint layer from being peeled off by the anti-aging agent of the paint layer.
- FIG. 1 is a cross-sectional view in the tire width direction of a tire half portion showing a tire according to an embodiment of the present invention in a no-load posture assembled with an applied rim and filled with a predetermined internal pressure.
- FIG. 4 is a cross-sectional view in the tire width direction of a tire half portion, exaggeratingly illustrating a deformation mode of an outer surface of a side portion at the time of tire rolling.
- FIG. 6 is a cross-sectional view in the tire width direction of a tire half portion, showing a tire according to another embodiment of the present invention in a no-load posture in which a tire is assembled to an applied rim and filled with a predetermined internal pressure.
- FIG. 6 is a cross-sectional view in the tire width direction of a tire half portion showing a tire according to still another embodiment of the present invention in a no-load posture in which a tire is assembled to an applied rim and filled with a predetermined internal pressure.
- a tire 10 illustrated in FIG. 1 includes a tread portion 1 that contacts a road surface, sidewall portions 2 that extend inward in the tire radial direction continuously to a tire radial inner end of a side portion of the tread portion 1,
- Each bead portion 3 is connected to the inner end in the tire radial direction of the wall portion 2.
- Each bead portion 3 is provided with a bead core 4 that locks the carcass ply 6 and a bead filler 5 that is disposed outside the bead core 4 in the tire radial direction.
- the tire 10 includes a carcass ply 6 that extends between the pair of bead portions 3 and allows radial arrangement, and the carcass ply 6 passes from the tread portion 1 through the pair of sidewall portions 2. Thus, it extends in a toroidal shape across the pair of bead portions 3 and is locked around the bead core 4 embedded in the bead portion 3 by, for example, folding back from the inner side to the outer side in the tire width direction.
- a part of the carcass ply 6 from the tread portion 1 to the folding position is referred to as a main body part 6b, and a part ahead of the folding position is referred to as a folding part 6c.
- An inner liner 7 is provided on the inner peripheral side of the carcass ply 6.
- the sidewall portion 2 of the tire 10 includes a contamination-preventing rubber layer 11 containing no anti-aging agent, a paint layer 12 adjacent to the contamination-preventing rubber layer 11 and exposed on the outer surface of the sidewall portion, and an anti-aging agent. And the rubber layers 13 a and 13 b adjacent to the inside and outside of the tire radial direction of the pollution prevention rubber layer 11 are disposed, and the paint layer 12 is separated from the rubber layers 13 a and 13 b by the pollution prevention rubber layer 11. .
- the paint layer 12 can form a mark made up of characters, figures, symbols including bar codes, patterns, and the like in the tire circumferential direction.
- the paint layer 12 can have any color.
- the coating layer 12 is formed by, for example, spraying a coating material containing ink from the head of an ink jet printer onto the surface of the pollution-preventing rubber layer 11 of the vulcanized tire and printing the surface. Can be formed.
- the paint layer 12 can also be formed by stacking a plurality of kinds of paints.
- a UV curable ink is particularly preferable as the coating material constituting the coating layer 12. This is because the UV curable ink has high strength after curing, and has a high durability against ink peeling, in which the paint layer peels off due to rubbing during running of the tire. Further, the UV curable ink has good adhesion to the contamination-preventing rubber layer.
- the contamination-preventing rubber layer means a rubber layer that does not contain an anti-aging agent and at least does not contaminate the paint layer adjacent to the anti-aging agent.
- the anti-aging agent contained in the rubber layers 13a and 13b does not reach the paint layer 12 and effectively prevents the paint layer 12 from contamination. can do.
- the rubber component of the pollution prevention rubber layer 11 includes natural rubber (NR), butyl rubber (IIR), halogenated butyl rubber, isoprene rubber (IR), butadiene rubber (BR), styrene butadiene rubber (SBR), and chloroprene rubber (CR). , Acrylonitrile butadiene rubber (NBR), ethylene propylene diene terpolymer (EPDM) and the like can be blended alone or in combination of two or more.
- the proportion of the ethylene propylene diene terpolymer in the pollution prevention rubber layer is 80% by weight in 100 parts by weight of the rubber component. It is preferable that the amount be at least part.
- the contamination-preventing rubber layer 11 contains butyl rubber, thereby reducing the permeation of the anti-aging agent in the contamination-preventing rubber layer 11, and the anti-aging agent contained in the rubber layers 13a and 13b. Contamination can be prevented. Further, when the contamination preventing rubber layer 11 contains an inorganic clay mineral, the permeation of the anti-aging agent in the contamination preventing rubber layer 11 is further reduced, and the contamination preventing effect of the paint layer 12 by the rubber layers 13a and 13b is further increased. Can be increased.
- the peeling of the paint layer generally occurs from the end first.
- the outermost end 12a in the tire radial direction of the paint layer 12 is separated from the bead toe 3a to the outer side in the tire radial direction by 65% or more of the tire cross-section height SH. ing.
- the outermost end 12a in the tire radial direction of the paint layer 12 is separated from a region in which distortion increases during load rolling (a region of 55% or less of the tire cross-section height SH from the bead toe 3a to the outer side in the tire radial direction).
- the paint layer 12 can be prevented from peeling at the outermost end 12a in the tire radial direction, and the visibility and decorativeness of the paint layer 12 can be improved.
- the paint layer 12 is brought into contact with a curbstone or the like. It is possible to effectively prevent peeling.
- the tire radial direction cross section of the antifouling rubber layer 11 is the largest in the tire radial direction. It is preferable that the peripheral length L between the outer end 11a and the outermost end 12a in the tire radial direction of the paint layer 12 along the outer surface of the contamination prevention rubber layer is 10 mm or more.
- the peeling resistance of the paint layer can be improved by setting the peripheral length L to 10 mm or more. Further, by setting the peripheral length L to 10 mm or more, it is possible to effectively prevent contamination of the paint layer by the anti-aging agent.
- the shortest distance between the surface of the paint layer 12 and the surface of the rubber layer 13a is 7 mm or more.
- the innermost end 12b in the tire radial direction of the paint layer 12 is positioned on the inner side in the tire radial direction from the tire maximum width position Pw where a large strain is generated during load rolling, thereby effectively removing the paint layer 12. Can be prevented.
- the outermost end 11a in the tire radial direction of the contamination prevention rubber layer 11 is positioned on the outer side in the tire radial direction with respect to the outermost end 12a in the tire radial direction of the paint layer 12.
- the anti-aging agent does not reach the paint layer by interposing the anti-contamination rubber layer between the paint layer and the rubber layer containing the anti-aging agent in the vicinity of the outermost end in the tire radial direction of the paint layer. And contamination of the paint layer by the anti-aging agent can be prevented.
- the innermost end 11b in the tire radial direction of the anti-contamination rubber layer 11 is positioned on the inner side in the tire radial direction than the innermost end 12b in the tire radial direction of the paint layer 12. Thereby, the contamination of the paint layer by the anti-aging agent can be prevented in the vicinity of the innermost end in the tire radial direction of the paint layer.
- the outermost end 11a in the tire radial direction of the pollution prevention rubber layer 11 is positioned on the inner side in the tire radial direction from the tread grounding end Pt, so that the vicinity of the adhesion boundary surface 14a between the pollution prevention rubber layer 11 and the rubber layer 13a.
- the thickness of the pollution prevention rubber layer 11 here shall be measured in the direction of the normal line set up on the surface inside a tire width direction of the pollution prevention rubber layer 11 in a tire width direction cross section.
- the tire 10 is assembled
- rubbing occurs on the contact surface between the tire 10 and the rim flange 21, and a large stress is generated near the contact surface.
- the innermost end 11b in the tire radial direction of the anti-contamination rubber layer 11 and the paint layer 12 is preferably disposed on the outer side in the tire radial direction than the outermost end 21a in the tire radial direction of the rim flange 21.
- FIG. 110 A tire according to another embodiment of the present invention is shown in FIG.
- the side rubber 111 disposed in the sidewall portion 102 extends to the inner side in the tire radial direction of the tread rubber 112, in this example, the inner side in the tire radial direction of the belt 113.
- the tread rubber 112 includes a mini side rubber 112a on the outer side in the tire width direction.
- the side rubber 111 and the mini side rubber 112a do not contain an anti-aging agent and function as the above-described anti-contamination rubber layer.
- the tire of this embodiment is easy to manufacture.
- a product tire is manufactured by molding a green case containing side rubber and carcass ply, placing a belt layer member and a tread rubber member on the outer periphery of the green case, molding the green case, and vulcanizing the green case. Is done. Therefore, by adopting the above-described configuration, it is easy to expose the mini side rubber to the outer surface of the tire, and it is possible to easily manufacture a tire having the anti-contamination rubber layer up to the vicinity of the tread portion.
- FIG. 1 A tire according to yet another embodiment of the present invention is shown in FIG.
- the folded portion 206 c of the carcass ply 206 extends to the outer side in the tire radial direction from the outermost end 12 a in the tire radial direction of the paint layer 12.
- the vicinity of the folded end portion 206a of the carcass ply 206 overlaps with the belt 8 in the tire width direction and extends inward in the tire width direction.
- the main body portion 206b and the folded portion 206c of the carcass ply 206 overlap each other on the outer side in the tire radial direction from the position 205a.
- the 205a is the outermost end in the tire radial direction of the bead filler 205 sandwiched between the main body portion 206b and the folded-back portion 206c, and is disposed on the inner side in the tire radial direction from the innermost end 12b in the tire radial direction of the paint layer 12. .
- the tire 210 has the same configuration as the tire 10 shown in FIG.
- the folded end portion 206a of the carcass ply 206 is disposed on the radially outer side of the tire radial direction outermost end 12a of the paint layer 12 so that the paint layer 12 has the tire radial direction. It is possible to further suppress the peeling of the paint layer 12 at the outermost end 12a and other positions.
- the innermost end 12b in the tire radial direction of the paint layer 12 and other positions can be used.
- the peeling of the paint layer 12 can be further suppressed.
- the vicinity of the folded end portion 206a of the carcass ply 206 overlaps with the belt 8 in the tire width direction and extends inward in the tire radial direction.
- the folded end portion 206a of the carcass ply 206 is restrained by the belt 8, and the strain generated at the outermost end 12a in the tire radial direction of the coating layer 12 during the rolling load of the tire is further reduced.
- production of peeling in the tire radial direction outermost end 12a of the layer 12 can be suppressed further.
- the outermost end 205a in the tire radial direction of the bead filler 205 is disposed on the inner side in the tire radial direction with respect to the innermost end 12b in the tire radial direction of the coating layer 12, thereby The paint layer 12 can be prevented from peeling off due to surrounding distortion, and the peel resistance of the paint layer 12 can be further improved.
- the bending rigidity of the sidewall portion 2 is ensured by disposing the outermost end 205a in the tire radial direction 205 of the bead filler at a position 15 to 25% of the tire cross-section height SH outside the bead toe 3a in the tire radial direction.
- the strain in the vicinity of the innermost end 12b in the tire radial direction of the paint layer 12 can be reduced to further improve the peel resistance of the paint layer 12.
- the configuration of the present invention is applied to the tire half on one side, particularly the half on the outside of the vehicle, but the configuration of the present invention can also be applied to both sides of the tire.
- Example tires having a tire size of 195 / 65R15 and comparative tires having a tire size of 195 / 65R15 were produced as prototypes and their performance was evaluated.
- both the example tire and the comparative example tire are adjacent to the side wall 2 with the anti-aging rubber layer 11 containing no anti-aging agent, and the anti-fouling rubber layer 11.
- a paint layer 12 exposed on the outer surface and an anti-aging agent are included, and rubber layers 13a and 13b adjacent to the inside and outside of the contamination preventing rubber layer 11 in the tire radial direction are disposed.
- Table 1 shows various specifications of the tires of the respective examples.
- the outermost end in the tire radial direction of the paint layer is separated from the bead toe by 70% of the tire cross section height outward in the radial direction of the tire, and the outermost end in the tire radial direction of the anti-contamination rubber layer is coated.
- the layer is positioned on the outer side in the tire radial direction from the outermost end in the tire radial direction.
- the innermost end in the tire radial direction of the paint layer is spaced from the bead toe by 25% of the tire cross-section height outward in the tire radial direction.
- the outermost end in the tire radial direction of the anti-contamination rubber layer is separated from the bead toe by 70% of the tire cross-section height outward in the tire radial direction.
- the comparative example tires 1 and 2 are respectively separated from the bead toe by 60% and 55% of the tire cross-section height SH from the bead toe in the tire radial direction of the coating layer in the tire radial direction.
- the outermost end in the tire radial direction and the outermost end in the tire radial direction of the paint layer are at the same position in the tire radial direction.
- the innermost end in the tire radial direction of the paint layer is spaced from the bead toe by 25% of the tire cross-section height outward in the tire radial direction.
- Example tires 1 to 8 the folded end portion of the carcass ply is disposed at a position 90% of the tire cross-section height SH on the outer side in the tire radial direction from the bead toe. Further, the vicinity of the folded end portion of the carcass ply overlaps with the belt in the tire width direction and extends inward in the tire radial direction. On the other hand, in the example tire 9 and the comparative example tires 1 to 3, the folded end portion of the carcass ply is disposed at a position of 50% of the tire cross-section height SH on the outer side in the tire radial direction from the bead toe.
- the outermost end in the tire radial direction of the bead filler is disposed at a position 20% of the tire cross-section height SH on the outer side in the tire radial direction from the bead toe.
- the outermost end in the tire radial direction of the bead filler is disposed at a position 30% of the tire cross-section height SH from the bead toe in the tire radial direction outer side.
- the innermost end 11b in the tire radial direction of the anti-contamination rubber layer 11 and the innermost end 12b in the tire radial direction of the paint layer 12 are inside in the tire radial direction from the tire maximum width position Pw. Is located.
- Example tires and comparative example tires are filled with a predetermined internal pressure of JATMA standard, the maximum load capacity of JATMA standard is loaded, drum tests are performed over 10,000 km and 30000 km, respectively, and the occurrence of peeling of the paint layer occurs.
- the peeling resistance of the paint layer was evaluated by checking the presence or absence. The results are shown in Tables 1 and 2.
- As an evaluation against rubbing it was evaluated whether or not peeling occurred by being brought into contact with the curb after mounting on Example tires and Comparative Example tire vehicles. The results are also shown in Tables 1 and 2.
- Example tires and comparative tires were stored in a weather meter, exposed for 48 hours, created a state equivalent to being left outdoors for about one month, and it was confirmed whether discoloration occurred in the paint layer. The stain resistance was evaluated. Similarly, the tires of the example and the comparative example were created in a state equivalent to being left outdoors for about 3 months, and it was confirmed whether or not discoloration occurred in the paint layer. These results are shown in Tables 1 and 2.
- the outermost end in the tire radial direction of the paint layer is spaced 65% or more of the tire cross-section height from the bead toe to the outer side in the tire radial direction, and the outermost end in the tire radial direction of the anti-pollution rubber layer
- Example tires 1 to 9 positioned on the outer side in the tire radial direction of the outermost layer in the tire radial direction of the layer are excellent in peeling resistance and contamination resistance, while comparative tires 1 to 3 are resistant to peeling. It was revealed that at least one of the property and the stain resistance was insufficient.
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Abstract
Description
一方、タイヤの負荷転動に当ってのタイヤのサイドウォール部の歪み(変形)の様子を図2に仮想線で誇張して示す。図に示すように、負荷転動時のタイヤの歪み量は、タイヤ最大幅位置Pw近傍でピークとなり、タイヤ最大幅位置Pwよりもタイヤ径方向内側にむかって減少する。そのため、装飾部の視認性を向上させるために、装飾部をタイヤ最大幅位置近傍にまで配置すると、特に装飾部のタイヤ径方向最外端部で剥離が発生しやすくなるという問題があった。
ここで、「タイヤ断面高さ」とは、タイヤの外径と適用リムのリム径との差の1/2をいう。
また、「適用リム」とは、タイヤが生産されまたは、使用される地域に有効な産業規格がタイヤ毎に定めているリムであり、JATMA(日本自動車タイヤ協会)であれば標準リム、TRA(THE TIRE and RIM ASSOCIATION INC.)であれば“Design Rim”、ETRTO(European Tyre and Rim Technical Organisation)であれば“Measuring RIM”となる。
そして、「所定内圧」とは、JATMA等の上記の規格で、タイヤサイズに応じて規定される、タイヤの最大負荷能力に対応する充填空気圧(最高空気圧)をいい、「最大負荷能力」とは、上記の規格でタイヤに負荷することが許される最大の質量をいう。
ところで、ここでいう空気は、窒素ガスその他の不活性ガスに置換することもできる。
また、この明細書及び特許請求の範囲において、「トレッド接地端」とは、適用リムに組み付けられたタイヤに、最大負荷能力の荷重を加えたときの、タイヤ幅方向断面における、タイヤ表面が地面と接触する面のタイヤ幅方向最外点のことをいうものとする。
なお、下記の説明はあくまで例示であり、各部材の構成や作用効果等は、これに限定されるものではない。
図1に例示するタイヤ10は、路面に接地するトレッド部1と、トレッド部1の側部のタイヤ径方向内方端に連続してタイヤ径方向内方に延びる各サイドウォール部2と、サイドウォール部2のタイヤ径方向内端に連なる各ビード部3とを具えてなる。各ビード部3には、カーカスプライ6を係止するビードコア4と、ビードコア4のタイヤ径方向外側に配置されるビードフィラ5とが設けられている。
また、カーカスプライ6の内周側に、インナーライナー7を具える。
また塗料層12は、たとえば、加硫成型後のタイヤの、汚染防止ゴム層11の前記表面上に、インクジェットプリンタのヘッドから、インキを含む塗料を噴射して、該表面上に印刷することで形成することができる。複数種類の塗料を重ねて塗料層12を形成することもできる。
ここで塗料層12を構成する塗料としては特にUV硬化系インクが好ましい。この理由として、UV硬化型インクは硬化後の強度が高く、タイヤ走行時のこすれ等により塗料層が剥離する、インク剥離に対する耐久性が強いためである。またUV硬化系インクは汚染防止ゴム層との接着性も良好である。
汚染防止ゴム層11を、このようなゴム組成物から形成することで、ゴム層13a、13bに含まれる老化防止剤が塗料層12まで到達しないようにして、塗料層12を汚染から有効に防止することができる。
汚染防止ゴム層11のゴム成分としては、天然ゴム(NR)、ブチルゴム(IIR)、ハロゲン化ブチルゴム、イソプレンゴム(IR)、ブタジエンゴム(BR)、スチレンブタジエンゴム(SBR)、クロロプレンゴム(CR)、アクリロニトリルブタジエンゴム(NBR)、エチレンプロピレンジエン三元共重合体(EPDM)等を単独または2種以上の組合せで配合することができる。なお、汚染防止ゴム層11にエチレンプロピレンジエン三元共重合体を配合した場合は、汚染防止ゴム層中に、エチレンプロピレンジエン三元共重合体が占める割合を、ゴム成分100重量部中80重量部以上とすることが好適である。
さらに、前記汚染防止ゴム層11が無機粘土鉱物を含む場合は、汚染防止ゴム層11での老化防止剤の透過を一層低減させて、ゴム層13a、13bによる塗料層12の汚染防止効果を一層高めることができる。
このため、本発明のタイヤ10では、図1に示すように、塗料層12のタイヤ径方向最外端12aを、ビードトウ3aからタイヤ径方向外側に、タイヤ断面高さSHの65%以上離隔させている。
これにより、塗料層12のタイヤ径方向最外端12aを、負荷転動時に歪みが大きくなる領域(ビードトウ3aからタイヤ径方向外側に、タイヤ断面高さSHの55%以下の領域)から離隔し、塗料層12のタイヤ径方向最外端12aでの剥離を防止することができるとともに、塗料層12の視認性及び装飾性を向上させることができる。
複数の端部(汚染防止ゴム層11のタイヤ径方向最外端11aと塗料層12のタイヤ径方向最外端12a)が歪みの発生しやすいタイヤサイド部の外表面上で近接すると、タイヤサイド部の外表面付近の各層の端部11a、12a間で応力集中が発生し、塗料層の端部が、よりはがれやすくなる。これに対し、該ペリフェリ長さLを10mm以上とすることで、塗料層の耐剥離性を向上させることができる。
また、該ペリフェリ長さLを10mm以上とすることで、老化防止剤による塗料層の汚染を有効に防止することができる。
また好ましくは、塗料層12の表面とゴム層13aの表面との間の最短距離を7mm以上とする。汚染防止ゴム層に、このような汚染距離(老化防止剤がゴム中を移行し汚染する距離)を確保することで、茶変を有効に防止することができる。
そのため、前記塗料層12のタイヤ径方向最内端12bを、負荷転動時に大きな歪みが発生するタイヤ最大幅位置Pwよりもタイヤ径方向内側に位置させることで、塗料層12の剥離を有効に防止することができる。
このように、塗料層のタイヤ径方向最外端付近において、老化防止剤を含むゴム層と塗料層との間に汚染防止ゴム層を介在させることで、老化防止剤が塗料層まで到達しないようにし、老化防止剤による塗料層の汚染を防止することができる。
なお、より好ましくは、汚染防止ゴム層11のタイヤ径方向最内端11bを、塗料層12のタイヤ径方向最内端12bよりもタイヤ径方向内側に位置させる。これにより、塗料層のタイヤ径方向最内端付近において、老化防止剤による塗料層の汚染を防止することができる。
なお、ここでいう汚染防止ゴム層11の厚みは、タイヤ幅方向断面で、汚染防止ゴム層11のタイヤ幅方向内側の表面に立てた法線の方向で測定するものとする。
塗料層12の剥離を防止し、接着境界面14bで汚染防止ゴム層11とゴム層13bとの剥離を防止する観点から、汚染防止ゴム層11のタイヤ径方向最内端11b及び塗料層12のタイヤ径方向最内端12bを、リムフランジ21のタイヤ径方向最外端21aよりも、タイヤ径方向外側に配置することが好ましい。
この実施形態のタイヤは製造が容易である。一般に製品タイヤは、サイドゴムとカーカスプライとを含む生ケースを成型し、該生ケースの外周側にベルト層部材、トレッドゴム部材を配置してグリーンケースを成型し、グリーンケースを加硫して製造される。そのため、上記の構成をとることで、ミニサイドゴムをタイヤの外表面に露出させることが容易となり、トレッド部付近までを汚染防止ゴム層としたタイヤを容易に製造することができる。
また、カーカスプライ206の本体部分206bと折り返し部分206cとは、位置205aよりもタイヤ径方向外側で重なっている。この205aは、本体部分206bと折り返し部分206cとで挟まれるビードフィラ205の、タイヤ径方向最外端であり、塗料層12のタイヤ径方向最内端12bよりもタイヤ径方向内側に配置されている。
上記の点を除いて、タイヤ210は、図1に示すタイヤ10と同様の構成を有する。
一方、カーカスプライ206の折り返し端部を、塗料層12のタイヤ径方向最内端12bの径方向内側に配置することでも、塗料層12のタイヤ径方向最内端12b及びその他の位置での、塗料層12の剥離を一層抑制することができる。
さらに、ビードフィラの205のタイヤ径方向最外端205aを、ビードトウ3aからタイヤ径方向外側にタイヤ断面高さSHの15~25%の位置に配置することで、サイドウォール部2の曲げ剛性を確保しつつ、タイヤ負荷転動時に、塗料層12のタイヤ径方向最内端12b付近での歪みを小さくして、塗料層12の耐剥離性をより一層向上させることができる。
なお、実施例タイヤについてはいずれも、塗料層のタイヤ径方向最外端をビードトウからタイヤ径方向外側にタイヤ断面高さの70%離隔させ、汚染防止ゴム層のタイヤ径方向最外端を塗料層のタイヤ径方向最外端よりもタイヤ径方向外側に位置させている。塗料層のタイヤ径方向最内端は、ビードトウからタイヤ径方向外側にタイヤ断面高さの25%離隔させている。
一方、比較例タイヤについてはいずれも、汚染防止ゴム層のタイヤ径方向最外端をビードトウからタイヤ径方向外側にタイヤ断面高さの70%離隔させている。比較例タイヤ1、2はそれぞれ、塗料層のタイヤ径方向最外端をビードトウからタイヤ径方向外側にタイヤ断面高さSHの60%、55%離隔させ、比較例タイヤ3は汚染防止ゴム層のタイヤ径方向最外端と塗料層のタイヤ径方向最外端とを、タイヤ径方向で同じ位置としている。塗料層のタイヤ径方向最内端は、ビードトウからタイヤ径方向外側にタイヤ断面高さの25%離隔させている。
一方、実施例タイヤ9及び比較例タイヤ1~3では、カーカスプライの折り返し端部は、ビードトウからタイヤ径方向外側にタイヤ断面高さSHの50%の位置に配置されている。
一方、実施例タイヤ8及び比較例タイヤ1~3では、ビードフィラのタイヤ径方向最外端は、ビードトウからタイヤ径方向外側にタイヤ断面高さSHの30%の位置に配置されている。
実施例タイヤおよび比較例タイヤに、JATMA規格の所定内圧を充填し、JATMA規格の最大負荷能力を負荷して、10000km、及び30000kmのそれぞれにわたって、ドラム試験を実施し、塗料層の剥離の発生の有無を確認することにより、塗料層の耐剥離性を評価した。その結果を表1及び2に示す。
また擦れに対する評価として、実施例タイヤおよび比較例タイヤ車両に装着した後、縁石に接触させて剥離が発生しているかどうかを評価した。その結果も表1及び2に示す。
実施例タイヤおよび比較例タイヤを、ウェザーメーターに格納して48時間暴露し、約1ヶ月屋外に放置するのと同等の状態を作り出して、塗料層に変色が起こるか否かを確認することで、耐汚染性を評価した。また同様に、実施例タイヤおよび比較例タイヤを、約3ヶ月屋外に放置するのと同等の状態を作り出して、塗料層に変色が起こるか否かも確認した。これらの結果を表1及び2に示す。
2 サイドウォール部
3 ビード部
3a ビードトウ
4 ビードコア
5 ビードフィラ
6 カーカスプライ
6a 折り返し端部
6b 本体部分
6c 折り返し部分
7 インナーライナー
10 タイヤ
11 汚染防止ゴム層
11a タイヤ径方向最外端
11b タイヤ径方向最内端
12 塗料層
12a タイヤ径方向最外端
12b タイヤ径方向最内端
13a、13b ゴム層
14a、14b 接着境界面
21 リムフランジ
21a タイヤ径方向最外端
102 サイドウォール部
103 ビード部
110 タイヤ
111 サイドゴム(汚染防止ゴム層)
112 トレッドゴム
112a ミニサイドゴム(汚染防止ゴム層)
113 ベルト
205 ビードフィラ
205a タイヤ径方向最外端
206 カーカスプライ
206a 折り返し端部
206b 本体部分
206c 折り返し部分
210 タイヤ
Claims (7)
- 路面に接地するトレッド部と、該トレッド部に連なって設けられるサイドウォール部と、前記サイドウォール部のタイヤ径方向内側に連なるビード部とを具え、
該サイドウォール部の少なくとも一部に、老化防止剤を含まない汚染防止ゴム層と、該汚染防止ゴム層に隣接し、該サイドウォール部の外表面に露出する塗料層とを設けてなるタイヤであって、
該塗料層のタイヤ径方向最外端を、ビードトウからタイヤ径方向外側に、タイヤ断面高さの65%以上離隔させ、
該汚染防止ゴム層のタイヤ径方向最外端を、該塗料層のタイヤ径方向最外端よりもタイヤ径方向外側に位置させたことを特徴とする、タイヤ。 - 前記トレッド部から前記サイドウォール部を経て前記ビード部までトロイド状に延びる本体部分、及び前記本体部分に連続して前記ビード部の周りに折り返してなる折り返し部分を有する一枚以上のカーカスプライを設け、
前記カーカスプライの折り返し端部を、前記塗料層のタイヤ径方向最外端よりもタイヤ径方向外側、又は前記塗料層のタイヤ径方向最内端よりもタイヤ径方向内側に配置してなる、請求項1に記載のタイヤ。 - 前記ビード部にビードフィラを設け、
前記ビードフィラのタイヤ径方向最外端を、前記塗料層のタイヤ径方向最内端よりもタイヤ径方向内側に配置してなる、請求項1または2に記載のタイヤ。 - 前記塗料層のタイヤ径方向最外端を、前記トレッド部のタイヤ径方向最外端から、タイヤ径方向内側に8mm以上離隔させてなる、請求項1~3のいずれか一項に記載のタイヤ。
- 前記汚染防止ゴム層のタイヤ径方向最外端を、トレッド接地端よりもタイヤ径方向内側に位置させてなる、請求項1~4のいずれか一項に記載のタイヤ。
- タイヤ幅方向断面で、前記汚染防止ゴム層のタイヤ径方向最外端と前記塗料層のタイヤ径方向最外端との間の、該汚染防止ゴム層の外表面に沿ったペリフェリ長さを10mm以上としてなる、請求項1~5のいずれか一項に記載のタイヤ。
- 前記塗料層のタイヤ径方向最内端を、タイヤ最大幅位置よりもタイヤ径方向内側に位置させ、
前記汚染防止ゴム層のタイヤ径方向最内端を、該塗料層のタイヤ径方向最内端よりもタイヤ径方向内側に位置させてなる、請求項1~6のいずれか一項に記載のタイヤ。
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JP2014545554A JPWO2014073157A1 (ja) | 2012-11-08 | 2013-10-04 | タイヤ |
EP13853242.9A EP2918428B1 (en) | 2012-11-08 | 2013-10-04 | Tire |
US14/436,964 US20150306919A1 (en) | 2012-11-08 | 2013-10-04 | Tire |
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EP (1) | EP2918428B1 (ja) |
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CN106032102A (zh) * | 2015-03-12 | 2016-10-19 | 赛轮金宇集团股份有限公司 | 一种超低断面彩字轮胎及其制备方法 |
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FR3054483A1 (fr) | 2016-07-29 | 2018-02-02 | Compagnie Generale Des Etablissements Michelin | Pneumatique avec insert pour flanc |
US12023963B2 (en) * | 2018-04-19 | 2024-07-02 | The Yokohama Rubber Co., Ltd. | Pneumatic tire |
EP3785945A4 (en) * | 2018-04-24 | 2021-12-29 | Bridgestone Corporation | Vulcanized rubber body and tire to which vulcanized rubber body is attached to sidewall thereof |
US20210268843A1 (en) * | 2018-06-18 | 2021-09-02 | The Yokohama Rubber Co., Ltd. | Pneumatic Tire |
JP2022100978A (ja) * | 2020-12-24 | 2022-07-06 | 住友ゴム工業株式会社 | 空気入りタイヤ |
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CN104768776B (zh) | 2017-05-03 |
US20150306919A1 (en) | 2015-10-29 |
JPWO2014073157A1 (ja) | 2016-09-08 |
CN104768776A (zh) | 2015-07-08 |
EP2918428A1 (en) | 2015-09-16 |
EP2918428B1 (en) | 2018-06-20 |
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