WO2016088365A1 - 空気入りタイヤ及び空気入りタイヤの製造方法 - Google Patents
空気入りタイヤ及び空気入りタイヤの製造方法 Download PDFInfo
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- WO2016088365A1 WO2016088365A1 PCT/JP2015/005973 JP2015005973W WO2016088365A1 WO 2016088365 A1 WO2016088365 A1 WO 2016088365A1 JP 2015005973 W JP2015005973 W JP 2015005973W WO 2016088365 A1 WO2016088365 A1 WO 2016088365A1
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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
- B60C5/00—Inflatable pneumatic tyres or inner tubes
- B60C5/12—Inflatable pneumatic tyres or inner tubes without separate inflatable inserts, e.g. tubeless tyres with transverse section open to the rim
- B60C5/14—Inflatable pneumatic tyres or inner tubes without separate inflatable inserts, e.g. tubeless tyres with transverse section open to the rim with impervious liner or coating on the inner wall of the tyre
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/0681—Parts of pneumatic tyres; accessories, auxiliary operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/08—Building tyres
- B29D30/20—Building tyres by the flat-tyre method, i.e. building on cylindrical drums
- B29D30/30—Applying the layers; Guiding or stretching the layers during application
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/08—Building tyres
- B29D30/20—Building tyres by the flat-tyre method, i.e. building on cylindrical drums
- B29D30/30—Applying the layers; Guiding or stretching the layers during application
- B29D30/3007—Applying the layers; Guiding or stretching the layers during application by feeding a sheet perpendicular to the drum axis and joining the ends to form an annular element
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/38—Textile inserts, e.g. cord or canvas layers, for tyres; Treatment of inserts prior to building the tyre
- B29D30/42—Endless textile bands without bead-rings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/0681—Parts of pneumatic tyres; accessories, auxiliary operations
- B29D2030/0682—Inner liners
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/08—Building tyres
- B29D30/10—Building tyres on round cores, i.e. the shape of the core is approximately identical with the shape of the completed tyre
- B29D30/16—Applying the layers; Guiding or stretching the layers during application
- B29D2030/1664—Details, accessories or auxiliary operations not provided for in the other subgroups of B29D30/00
- B29D2030/1671—Venting air inclusions during the layer applications, e.g. by creating grooves, channels, passages, holes in the band-like tire component to be applied
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/08—Building tyres
- B29D30/20—Building tyres by the flat-tyre method, i.e. building on cylindrical drums
- B29D30/30—Applying the layers; Guiding or stretching the layers during application
- B29D2030/3064—Details, accessories and auxiliary operations not otherwise provided for
- B29D2030/3071—Venting air inclusions during the layer applications, e.g. by creating grooves, channels, passages, holes in the band-like tire component to be applied
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/38—Textile inserts, e.g. cord or canvas layers, for tyres; Treatment of inserts prior to building the tyre
- B29D30/42—Endless textile bands without bead-rings
- B29D2030/421—General aspects of the joining methods and devices for creating the bands
- B29D2030/423—Joining by overlapping
-
- 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
- B60C5/12—Inflatable pneumatic tyres or inner tubes without separate inflatable inserts, e.g. tubeless tyres with transverse section open to the rim
- B60C5/14—Inflatable pneumatic tyres or inner tubes without separate inflatable inserts, e.g. tubeless tyres with transverse section open to the rim with impervious liner or coating on the inner wall of the tyre
- B60C2005/145—Inflatable pneumatic tyres or inner tubes without separate inflatable inserts, e.g. tubeless tyres with transverse section open to the rim with impervious liner or coating on the inner wall of the tyre made of laminated 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
- B60C5/12—Inflatable pneumatic tyres or inner tubes without separate inflatable inserts, e.g. tubeless tyres with transverse section open to the rim
- B60C5/14—Inflatable pneumatic tyres or inner tubes without separate inflatable inserts, e.g. tubeless tyres with transverse section open to the rim with impervious liner or coating on the inner wall of the tyre
- B60C2005/147—Inflatable pneumatic tyres or inner tubes without separate inflatable inserts, e.g. tubeless tyres with transverse section open to the rim with impervious liner or coating on the inner wall of the tyre characterised by the joint or splice
Definitions
- the present invention relates to a pneumatic tire and a method for manufacturing a pneumatic tire.
- a rubber composition mainly composed of butyl rubber or halogenated butyl rubber is used as an inner liner disposed as an air barrier layer on the inner surface of a tire in order to maintain the internal pressure of a pneumatic tire (hereinafter also simply referred to as a tire).
- a tire a pneumatic tire
- thermoplastic resins such as ethylene-vinyl alcohol copolymer (EVOH) are known to have excellent gas barrier properties, and the air permeation amount is 100 minutes that of the above butyl rubber composition for inner liners. Since it is 1 or less, for example, even if the thickness is 100 ⁇ m or less, the internal pressure retention of the tire can be greatly improved.
- Patent Literature 1 discloses a pneumatic tire including an inner liner made of EVOH.
- an object of the present invention is to obtain a pneumatic tire capable of suppressing air entry during molding while maintaining sufficient airtightness and improving production quality, and the pneumatic tire. It is providing the manufacturing method of the pneumatic tire which can be performed.
- a pneumatic tire according to the present invention includes a carcass layer extending between a pair of bead cores, and an inner liner layer formed of a thermoplastic resin disposed on the tire inner surface side of the carcass layer.
- a pneumatic tire provided with a composite layer comprising the inner liner layer and a rubber layer disposed on the carcass layer side of the inner liner layer, and the composite layer in the tire circumferential direction, the composite layer The tire circumferential direction both ends are joined in a state where they are overlapped, and a joint portion is provided, and the edge of the lower inner liner layer located on the lower side of the overlap that is the tire inner surface side in the joint portion is the first end.
- the edge of the upper inner liner layer located on the upper side of the edge is the second edge, and the first inner edge is formed by the rubber layer on the upper inner liner.
- the tire circumferential direction position that is the first circumferential edge side of the upper inner liner layer that is farthest on the inner surface of the tire is P, and the circumferential distance from the first edge to the position P is L
- the distance in the tire circumferential direction from the second edge to the position P is T, the distance T is 35 mm or less, the distance T ⁇ the distance L / 2 is 9 mm or more, and the distance L is more than 0% of the distance T and 20% or less. It is characterized by that.
- a method for manufacturing a pneumatic tire according to the present invention includes a carcass layer extending between a pair of bead cores, and an inner liner layer formed of a thermoplastic resin disposed on the tire inner surface side of the carcass layer, Forming a composite layer composed of the inner liner layer and a rubber layer disposed on the carcass layer side of the inner liner layer, and superimposing both ends of the composite layer in the tire circumferential direction on the tire circumferential direction;
- a pneumatic tire manufacturing method in which a joint portion is provided that are joined together in a state in which the composite layer located on the lower side of the overlap on the tire inner surface side in the joint portion is referred to as the lower composite layer, the upper side of the overlap
- the composite layer located at the upper composite layer is the upper composite layer, and the end surface of the rubber layer in the lower composite layer is tapped from the lower edge of the rubber layer toward the outer side in the tire radial direction.
- FIG. 1 is an explanatory view showing a joint portion of an inner liner layer of a pneumatic tire according to an embodiment of the present invention in a tire circumferential cross section (a cross section taken along a plane perpendicular to the tire rotation axis).
- FIG. 1 shows a tire circumferential cross section in the vicinity of the tire equatorial plane, and a member that is normally provided in a pneumatic tire other than the inner liner layer and the carcass layer, for example, a belt layer disposed outside the carcass layer in the tire radial direction.
- the tread and the like are omitted.
- the pneumatic tire 10 of the present embodiment is disposed along a carcass layer 11 on the tire inner surface side of the carcass layer 11 and a carcass layer 11 extending in a toroidal shape between a pair of bead cores (not shown).
- the inner liner layer 12 is provided.
- the carcass layer 11 is composed of one or more carcass plies including a radial arrangement code.
- the number and structure of the carcass plies of the carcass layer 11 are as follows.
- the material of the cord of the carcass ply of the carcass layer 11 is not particularly limited, and for example, organic fibers can be used.
- the inner liner layer 12 is an air permeation preventive layer provided on the inner surface of the pneumatic tire, and is made of a thermoplastic material such as a polyamide resin, an ethylene-vinyl alcohol copolymer, a modified ethylene-vinyl alcohol copolymer, or a urethane polymer. It is formed of a resin, in the present embodiment, a resin film in which the thermoplastic resin is formed into a film, and is bonded to a rubber member constituting the pneumatic tire by an adhesive, for example.
- the inner liner layer 12 of this embodiment is formed of a resin film made of an ethylene-vinyl alcohol copolymer (EVOH) that has a low air permeation amount and is particularly excellent in gas barrier properties.
- EVOH ethylene-vinyl alcohol copolymer
- the pneumatic tire 10 of the present embodiment forms a composite layer 14 including an inner liner layer 12 and a rubber layer 13 disposed on the carcass layer 11 side of the inner liner layer 12, and the composite layer 14 is used as a tire.
- a joint portion (joining portion) 15 is provided in which both ends of the composite layer 14 in the tire circumferential direction are overlapped and joined.
- the joint portion 15 overlaps both ends of the composite layer 14 in the tire circumferential direction, so that the lower composite layer 14a (ie, the lower composite layer 14) located on the tire inner surface side, that is, the lower side in the tire radial direction lower side.
- the first edge 16 that is the tire circumferential direction edge of the inner liner layer 12 (lower inner liner layer 12 a) of the lower composite layer 14 a is the rubber layer 13 (lower side of the lower composite layer 14 a).
- the tire circumferential direction edge of the rubber layer 13a) is positioned on the tire circumferential direction extension of the lower inner liner layer 12a and extends in the tire width direction, whereby the inner liner layer 12 (upper inner liner layer 12b of the upper composite layer 14b). ). That is, the lower rubber layer 13a is interposed between the first edge 16 and the upper inner liner layer 12b, including the extension of the lower inner liner layer 12a.
- the position of the upper inner liner layer 12 b closest to the first edge 16 on the tire inner surface, that is, on the extension of the lower inner liner layer 12 a in the tire circumferential direction, the first edge 16. Is a tire circumferential direction position along the tire inner surface from the first edge 16 to the position P, and a second edge that is a tire circumferential edge of the upper inner liner layer 12b.
- the distance L is set to be 20% or less of the distance T, where T is the tire circumferential distance along the tire inner surface from 17 to the position P.
- the first edge 16 is separated from the upper inner liner layer 12b by the rubber layer 13 (lower rubber layer 13a), so that both ends in the tire circumferential direction of the composite layer 14 are overlapped at the time of vulcanization molding.
- the air entering the stepped portion formed in the joint portion 15 that is generated when the joined joint portion 15 is formed can be prevented from being stored without coming out. That is, when the inner liner layers 12 of the lower inner liner layer 12a and the upper inner liner layer 12b are in contact with each other, air is interposed between the inner liner layers 12 made of a thermoplastic resin having high airtight permeability. When the air enters, the air becomes difficult to escape. Therefore, the rubber layer 13 can be exposed to the tire inner surface by separating the inner liner layers 12 without contacting each other, and the rubber layer 13 can be used as a path through which the air escapes. Because.
- the tire circumferential direction distance L is set to 20% or less of the tire circumferential direction distance T from the second end edge 17 to the position P so that the airtightness as a pneumatic tire is not affected. Setting the distance L in this way increases the distance of the portion along the tire circumferential direction of the air passage formed by overlapping both ends of the composite layer 14 in the tire circumferential direction.
- the distance L is preferably 10% or less of the distance T, more specifically 1 mm or less, and if it is within this range, confidentiality is further increased. Since the first end edge 16 is separated from the upper inner liner layer 12b, the distance L exceeds 0 mm (0%).
- the airtightness can be sufficiently maintained.
- the air passage can be made as small as possible to further improve the airtightness.
- the gauge in the tire radial direction of the rubber layer 13, particularly the lower rubber layer 13 a is A, and the gauge A is smaller than the distance L, for example, 0.5 mm or less, more preferably 0.4 mm or less. Is preferred. Thereby, the passage of air can be made smaller and airtightness can be further improved.
- the distance T is preferably 35 mm or less and 10 mm or more, more preferably 10 to 20 mm, and still more preferably 10 to 15 mm.
- the distance T is 10 mm or more, the air tightness can be further improved, and when it is 20 mm or less, and further 15 mm or less, the air entry during vulcanization molding can be further suppressed, and the production quality can be further increased. Improvements can be made. If the rubber layer 13 forming the composite layer 14 is formed of the same rubber material as that forming the coating rubber of the carcass layer 11, the adhesion between the rubber layer 13 and the carcass layer 11 can be improved. .
- the pneumatic tire 10 of the above-described embodiment includes, for example, an inner liner layer 12, a composite layer 14, a chafer layer, a carcass layer 11, a belt, and a tread made of a resin film obtained by forming a thermoplastic resin into a film on a molding drum.
- the composite layer 14 is provided in the tire circumferential direction, and the joint portion 15 is provided in which both ends of the composite layer 14 in the tire circumferential direction are overlapped and joined.
- the edge of the rubber layer 13 is inclined.
- the lower composite layer 14a and the upper composite layer 14b formed by the above are joined together in a state where both ends in the tire circumferential direction are overlapped.
- FIG. 2 is an explanatory view showing a tire circumferential direction end face of the rubber layer of the lower composite layer in a tire circumferential cross section before being overlapped at the joint portion of FIG.
- the rubber layer 13 (lower rubber layer 13a) of the lower composite layer 14a located on the lower side of the overlap is The tire circumferential end surface extending in the tire width direction is formed as an inclined surface that is inclined outward in the tire circumferential direction from the lower end edge of the rubber layer toward the outer side in the tire radial direction before being overlapped.
- the inclined surface is formed such that an angle ⁇ formed with the tire inner surface is an acute angle, for example, 30 degrees.
- the lower rubber layer 13a is exposed on the inner surface of the tire on the extension of the lower inner liner layer 12a after vulcanization. Thus, it is interposed between the first edge 16 and the upper inner liner layer 12b.
- the angle formed by the inclined surface formed at the edge of the rubber layer 13 of the lower composite layer 14a and the lower surface extension line of the rubber layer 13 is not limited to 30 degrees, but may be any value within the range of 15 to 90 degrees. It may be an angle.
- the pneumatic tire according to the present invention was prototyped with four types of examples in which the distance T was 10 mm and 20 mm, and the distance L was 10% or less of the distance T, and the confidentiality in each example was compared with four types of comparative examples. Compared.
- the relationship between the distance T and the distance L is expressed as distance T [mm]: distance L [mm]
- Example 1 is 10: 0.5
- Example 2 is 10: 2
- Example 3 is 20: 0. 5
- Example 4 is 20: 2
- Comparative Example 1 is 10:
- Comparative Example 2 is 10: 3
- Comparative Example 3 is 40: 0.5
- Comparative Example 4 is 40: 2.
- Table 1 shows the value of TL / 2 for the distance T (5, 10, 20, 40 [mm]) and the distance L (0, 0.5, 1.5, 2, 3 [mm]). ing.
- the distance L is 0 [mm]
- the lower inner liner layer 12a and the upper inner liner layer 12b are in contact with each other, and the path a serving as a path for air is blocked.
- TL / 2 is 9 mm or more (TL / 2 ⁇ 9 mm) is shown as pass ( ⁇ ), less than 9 mm is rejected ( ⁇ ), the rate of occurrence of air is 0% as pass ( ⁇ ), and other than 0% as fail ( ⁇ ).
- Examples 1 to 4 which are pneumatic tires according to the present invention can all ensure the same or higher in terms of confidentiality in comparison with existing rubber inner liners. In addition, the occurrence of air could not be confirmed.
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Abstract
Description
そこで、この発明の目的は、十分な気密性を維持しながら、成型時のエア入りを抑制することができ、生産品質の向上を図ることができる空気入りタイヤ、及び、当該空気入りタイヤを得ることができる空気入りタイヤの製造方法を提供することである。
図1は、この発明の一実施の形態に係る、空気入りタイヤのインナーライナー層のジョイント部を、タイヤ周方向断面(タイヤ回転軸に垂直な平面による断面)で示す説明図である。なお、図1は、タイヤ赤道面付近のタイヤ周方向断面を示し、インナーライナー層、カーカス層以外の、空気入りタイヤが通常備える部材、例えば、カーカス層のタイヤ径方向外側に配置されるベルト層やトレッド等は省略して示されている。
本実施形態の空気入りタイヤ10において、カーカス層11は、ラジアル配列コードを含む1枚以上のカーカスプライからなるが、本発明の空気入りタイヤにおいて、カーカス層11のカーカスプライの数及び構造は、これに限られるものではなく、また、カーカス層11のカーカスプライのコードの材質は特に限定しないが、例えば有機繊維等を用いることができる。
また、ゴム層13、特には下側ゴム層13aのタイヤ径方向のゲージをAとして、ゲージAは距離Lより小さく、一例として0.5mm以下、より好ましくは、0.4mm以下に設定されるのが好ましい。これにより、エアの通り道をより小さくして気密性をより高めることができる。
なお、複合層14を形成するゴム層13を、カーカス層11のコーティングゴムを形成するゴム材料と同一のゴム材料により形成すれば、ゴム層13とカーカス層11との接着性を高めることができる。
前述した実施形態の空気入りタイヤ10は、例えば、成型ドラム上に、熱可塑性樹脂をフィルム状にした樹脂フィルムからなるインナーライナー層12、複合層14、チェーファー層、カーカス層11、ベルト、トレッド部等を積層して巻き付け、未加硫タイヤを成型し、成型工程を経た未加硫タイヤをモールド内に装入し、シェーピングによって拡張変形させモールド成形面に押圧しつつ加熱することにより、加硫して製造することができる。
下側複合層14aのゴム層13の端縁に形成される傾斜面の、ゴム層13の下面延長線との成す角は、30度に限るものではなく、15~90度の範囲の任意の角度にしても良い。
インナーライナー層12同士のジョイント部の、下側インナーライナー層12aと上側インナーライナー層12bに挟まれた下側ゴム層13aを通って、第1端縁16と位置Pの離間部(距離L部分)に続く経路(図1矢印a参照)における機密性に関し、既存のゴムインナーライナーとの対比において同等以上を確保することが必要である。
ゴムインナーライナーの機密性INDEXを100とした場合、下側ゴム層13a(タイヤ径方向のゲージ0.4mm)の機密性INDEXは4.44であるから、ゴムインナーライナーと同等の気密性を確保するためのジョイント量は、0.4mm×100/4.44=9.0mmである。従って、T-L/2が9mm以上(T-L/2≧9mm)あれば良い。
エア入り発生の有無について、距離T(5,10,20,40[mm])と距離L(0,0.5,1.5,2,3[mm])の各組み合わせ毎にタイヤ10本について検証を実施し、シワが発生したものの割合を調べた。得られた結果であるエア入り発生率を表2に示す。一箇所でもエア入りが発生しシワの発生が確認されたら、そのタイヤは不合格とした。表2において、エア入り発生率0%はエア入りが発生したものの割合が0である、即ち、不合格のものの割合が0であることを示す。
総合評価として、T-L/2とエア入り発生率の各評価結果を、T-L/2が9mm以上(T-L/2≧9mm)を合格(○)、9mm未満を不合格(×)とし、エア入り発生率が0%のものを合格(○)、0%以外を不合格(×)として、表3に示した。
表3から分かるように、総合評価の結果として、この発明に係る空気入りタイヤである実施例1~4は全て、機密性に関し、既存のゴムインナーライナーとの対比において同等以上を確保することができ、また、エア入りの発生も確認できなかった。
Claims (7)
- 一対のビードコア間に延びるカーカス層と、前記カーカス層のタイヤ内面側に配置された、熱可塑性樹脂から形成されるインナーライナー層とを備えた空気入りタイヤであって、
前記インナーライナー層と、前記インナーライナー層のカーカス層側に配置されたゴム層とからなる複合層を形成し、前記複合層をタイヤ周方向で、前記複合層のタイヤ周方向両端部を重ね合わせた状態で繋ぎ合わせた、ジョイント部を設け、
前記ジョイント部における、タイヤ内面側となる重ね合わせ下側に位置する下側インナーライナー層の端縁を第1端縁、重ね合わせ上側に位置する上側インナーライナー層の端縁を第2端縁として、前記第1端縁は前記ゴム層によって前記上側インナーライナー層と離間し、
前記上側インナーライナー層の、タイヤ内面上で最も前記第1端縁側となるタイヤ周方向位置をPとし、前記第1端縁から位置Pまでのタイヤ周方向距離をL、前記第2端縁から位置Pまでのタイヤ周方向距離をTとして、距離Tが35mm以下、距離T-距離L/2が9mm以上、距離Lは距離Tの0%を越え20%以下であることを特徴とする、空気入りタイヤ。 - 前記ゴム層のタイヤ径方向のゲージをAとして、ゲージAは距離Lより小さい、請求項1に記載の空気入りタイヤ。
- 前記距離Lは、1mm以下である、請求項1または2に記載の空気入りタイヤ。
- 前記ゴム層のタイヤ径方向のゲージをAとして、前記ゲージAは、0.5mm以下である、請求項1から3のいずれか一項に記載の空気入りタイヤ。
- 前記ゴム層は、前記カーカス層のコーティングゴムを形成するゴム材料と同一のゴム材料により形成されている、請求項1から4のいずれか一項に記載の空気入りタイヤ。
- 前記距離Tは、10mm以上である、請求項1から5のいずれか一項に記載の空気入りタイヤ。
- 一対のビードコア間に延びるカーカス層と、前記カーカス層のタイヤ内面側に配置された、熱可塑性樹脂から形成されるインナーライナー層とを備え、前記インナーライナー層と、前記インナーライナー層のカーカス層側に配置されたゴム層とからなる複合層を形成し、前記複合層をタイヤ周方向で、前記複合層のタイヤ周方向両端部を重ね合わせた状態で繋ぎ合わせた、ジョイント部を設けた空気入りタイヤの製造方法であって、
前記ジョイント部における、タイヤ内面側となる重ね合わせ下側に位置する複合層を下側複合層、重ね合わせ上側に位置する複合層を上側複合層として、前記下側複合層における前記ゴム層の端面を、ゴム層下端縁からタイヤ径方向外側に向かうに従いタイヤ周方向外側に傾斜する傾斜面として形成し、前記下側複合層に前記上側複合層を重ね合わせて加硫することにより前記ジョイント部を設けることを特徴とする、空気入りタイヤの製造方法。
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JP2005238759A (ja) * | 2004-02-27 | 2005-09-08 | Sumitomo Rubber Ind Ltd | 空気入りタイヤ及びその製造方法 |
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JP2009208444A (ja) * | 2008-03-06 | 2009-09-17 | Bridgestone Corp | インナーライナーの成型方法 |
JP2013141758A (ja) * | 2012-01-10 | 2013-07-22 | Yokohama Rubber Co Ltd:The | 空気入りタイヤおよび空気入りタイヤの製造方法 |
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JP5181467B2 (ja) * | 2006-11-17 | 2013-04-10 | 横浜ゴム株式会社 | 空気入りタイヤ及びその製造方法 |
JP2010167829A (ja) * | 2009-01-20 | 2010-08-05 | Yokohama Rubber Co Ltd:The | 空気入りタイヤ及びその製造方法 |
JP5423732B2 (ja) * | 2010-12-22 | 2014-02-19 | 横浜ゴム株式会社 | 空気入りタイヤ |
JP5742437B2 (ja) * | 2010-12-24 | 2015-07-01 | 横浜ゴム株式会社 | 空気入りタイヤ |
JP6134471B2 (ja) * | 2011-02-22 | 2017-05-24 | 株式会社ブリヂストン | 未加硫タイヤの製造方法及び空気入りタイヤの製造方法 |
CN103502327B (zh) * | 2011-03-29 | 2015-12-16 | 埃克森美孚化学专利公司 | 动态硫化热塑性弹性体层压件 |
JP5810646B2 (ja) * | 2011-06-09 | 2015-11-11 | 横浜ゴム株式会社 | 空気入りタイヤ |
US20150343844A1 (en) * | 2012-12-03 | 2015-12-03 | The Yokohama Rubber Co., Ltd. | Pneumatic Tire |
JP6036271B2 (ja) * | 2012-12-21 | 2016-11-30 | 横浜ゴム株式会社 | 空気入りタイヤの製造方法 |
JP6236855B2 (ja) * | 2013-04-26 | 2017-11-29 | 横浜ゴム株式会社 | タイヤの製造方法 |
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JP2005238759A (ja) * | 2004-02-27 | 2005-09-08 | Sumitomo Rubber Ind Ltd | 空気入りタイヤ及びその製造方法 |
JP2008168846A (ja) * | 2007-01-15 | 2008-07-24 | Yokohama Rubber Co Ltd:The | 空気入りタイヤ |
JP2009208444A (ja) * | 2008-03-06 | 2009-09-17 | Bridgestone Corp | インナーライナーの成型方法 |
JP2013141758A (ja) * | 2012-01-10 | 2013-07-22 | Yokohama Rubber Co Ltd:The | 空気入りタイヤおよび空気入りタイヤの製造方法 |
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