JP5664111B2 - Tire mold and tire - Google Patents

Tire mold and tire Download PDF

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JP5664111B2
JP5664111B2 JP2010233323A JP2010233323A JP5664111B2 JP 5664111 B2 JP5664111 B2 JP 5664111B2 JP 2010233323 A JP2010233323 A JP 2010233323A JP 2010233323 A JP2010233323 A JP 2010233323A JP 5664111 B2 JP5664111 B2 JP 5664111B2
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forming
tire
bone
molding die
tread surface
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JP2012086396A (en
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裕輝 須藤
裕輝 須藤
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Yokohama Rubber Co Ltd
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Description

本発明は、タイヤ周方向に延在する縦溝、または、タイヤ周方向と交差する方向に延在する横溝の底部にウェアインジケータを備えるタイヤを成形するためのタイヤ成形用金型と、そのタイヤ成形用金型により製造されたタイヤに関する。 The present invention relates to a tire molding die for molding a tire having a wear indicator at the bottom of a longitudinal groove extending in the tire circumferential direction or a lateral groove extending in a direction crossing the tire circumferential direction, and the tire. The present invention relates to a tire manufactured by a molding die .

タイヤのトレッド面の縦溝または横溝の底部にウェアインジケータが突出形成され、このウェアインジケータにより縦溝または横溝の深さが１.６ｍｍになったことが示され、タイヤの摩耗限界が知らされる。
一方、タイヤ成形用金型は、トレッド面を成形するためのトレッド面成形用金型面と、トレッド面成形用金型面から突設された縦溝または横溝を成形するための溝成形骨と、溝成形骨の突出方向の先部に形成されウェアインジケータを成形するためのウェアインジケータ成形用凹部とを備えている。
そして、タイヤの加硫成形時、未加硫のゴムは、タイヤ成形用金型内において、ウェアインジケータ成形用凹部の周辺箇所からウェアインジケータ成形用凹部に流れ込み、縦溝または横溝の底部にウェアインジケータが突出形成される。 A wear indicator protrudes from the bottom of the vertical or horizontal groove on the tread surface of the tire, and the wear indicator indicates that the depth of the vertical or horizontal groove is 1.6 mm, thereby informing the wear limit of the tire. .
On the other hand, a tire molding die includes a tread surface molding die surface for molding a tread surface, and a groove forming bone for molding a vertical groove or a lateral groove protruding from the tread surface molding die surface. And a wear indicator forming recess for forming a wear indicator formed at the tip of the groove forming bone in the protruding direction.
During vulcanization molding of the tire, unvulcanized rubber flows into the wear indicator molding recess from the periphery of the wear indicator molding recess in the tire molding die, and the wear indicator is formed at the bottom of the vertical or horizontal groove. Projectingly formed.

特開２００６−２６４４８０JP 2006-264480 A 特開２００６−８８５８５JP 2006-88585 A

そのため、ウェアインジケータ成形用凹部の周辺箇所で未加硫ゴムのボリューム不足が生じ、ウェアインジケータ成形用凹部の周辺箇所ではゴム流れ不良による加硫故障が生じ易く、加硫故障が生じた場合には商品価値を高める上で不利となる。
本発明は前記事情に鑑み案出されたものであって、本発明の目的は、ウェアインジケータ成形用凹部の周辺でのゴム流れ不良による加硫故障を抑制し、商品価値を高める上で有利なタイヤ成形用金型およびタイヤを提供することにある。 For this reason, the volume of unvulcanized rubber is insufficient in the vicinity of the wear indicator molding recess, and in the vicinity of the wear indicator molding recess, vulcanization failure is likely to occur due to poor rubber flow. This is disadvantageous in increasing the product value.
The present invention has been devised in view of the above circumstances, and an object of the present invention is advantageous in suppressing vulcanization failure due to poor rubber flow around the wear indicator molding recess and increasing commercial value. The object is to provide a tire molding die and a tire .

前記目的を達成するため請求項１記載の発明は、トレッド面を成形するためのトレッド面成形用金型面と、前記トレッド面成形用金型面から突設された縦溝または横溝を成形するための溝成形骨と、前記溝成形骨の突出方向の先部に形成されウェアインジケータを成形するためのウェアインジケータ成形用凹部とを備えるタイヤ成形用金型であって、前記ウェアインジケータ成形用凹部が形成された前記溝成形骨の箇所は、前記ウェアインジケータ成形用凹部の底部から前記トレッド面成形用金型面に交わる箇所まで、前記溝成形骨の延在方向と直交する方向における幅が前記溝成形骨よりも大きな寸法の拡幅部として形成され、前記拡幅部と交わる前記トレッド面成形用金型面の箇所に、前記拡幅部の延在方向に沿って延在するエア逃がし用凹部が形成されていることを特徴とする。
また、請求項２記載の発明は、トレッド面を成形するためのトレッド面成形用金型面と、前記トレッド面成形用金型面から突設された縦溝または横溝を成形するための溝成形骨と、前記溝成形骨の突出方向の先部に形成されウェアインジケータを成形するためのウェアインジケータ成形用凹部とを備えるタイヤ成形用金型であって、前記ウェアインジケータ成形用凹部が形成された前記溝成形骨の箇所は、前記ウェアインジケータ成形用凹部の底部から前記トレッド面成形用金型面に交わる箇所まで、前記溝成形骨の延在方向と直交する方向における幅が前記溝成形骨よりも大きな寸法の拡幅部として形成され、前記ウェアインジケータ成形用凹部の底部は、前記溝成形骨の延在方向に沿って延在する底面と、前記溝成形骨の延在方向における前記底面の両端箇所から起立し互いに対向する一対の端面とを有し、前記底面の延在方向と直交する方向における前記底面の幅は、前記トレッド面成形用金型面から前記底面までの高さにおける前記溝成形骨の幅よりも大きい寸法で形成され、前記底面の延在方向と直交する方向における前記端面の幅は、前記溝成形骨に接続する箇所から前記底面に接続する箇所にむけて次第に大きくなる寸法で形成され、前記底面の延在方向と直交する方向における前記拡幅部の両側部は、前記底面の幅方向両端の箇所と前記トレッド面成形用金型面とを接続し、前記トレッド面成形用金型面に向かうにつれて互いに間隔が拡がるように形成された中央傾斜側面と、前記一対の端面の幅方向両端の箇所と前記トレッド面成形用金型面とを接続し、前記トレッド面成形用金型面に向かうにつれて、かつ、前記溝成形骨の側面から前記中央傾斜側面に至るにつれて互いに間隔が拡がるように形成された端部傾斜側面とを有していることを特徴とする。
また、請求項３記載の発明は、前記トレッド面成形用金型面に交わる前記拡幅部の基端の幅Ｗ１は、前記トレッド面成形用金型面に交わる前記溝成形骨の基端の幅Ｗ２よりも０.５ｍｍ以上３.０ｍｍ以下の大きな寸法で形成されていることを特徴とする。
また、請求項４記載の発明は、前記拡幅部と交わる前記トレッド面成形用金型面の箇所に、前記トレッド面成形用金型面と反対に位置する前記タイヤ成形用金型の箇所に貫通するベントホールが形成されていることを特徴とする。
また、請求項５記載の発明は、請求項１乃至４の何れか１項記載のタイヤ成形用金型により製造されたタイヤであることを特徴とする。 In order to achieve the above object, a first aspect of the present invention forms a tread surface molding die surface for molding a tread surface, and a vertical groove or a lateral groove protruding from the tread surface molding die surface. A wear molding die including a groove forming bone for forming and a wear indicator forming recess for forming a wear indicator formed at a tip portion in a protruding direction of the groove forming bone, the wear indicator forming recess The width of the groove forming bone where the groove forming bone is formed has a width in a direction perpendicular to the extending direction of the groove forming bone from the bottom of the wear indicator forming concave portion to the portion intersecting the tread surface forming mold surface. is formed as a widened portion of larger size than the groove forming bone, the position of the tread surface mold surface intersecting the widened portion, relief air extends along the extending direction of the wider section Wherein the recess is formed.
According to a second aspect of the present invention, there is provided a tread surface molding mold surface for molding a tread surface, and a groove molding for molding a vertical groove or a horizontal groove protruding from the tread surface molding mold surface. A tire molding die comprising a bone and a wear indicator molding recess for molding a wear indicator formed at a front portion in the protruding direction of the groove molding bone, wherein the wear indicator molding recess is formed The groove-forming bone has a width in a direction perpendicular to the extending direction of the groove-forming bone from the bottom of the wear indicator-forming recess to the portion intersecting the tread surface molding die surface. is also formed as a widened portion of larger dimensions, the bottom of the wear indicator molding recess comprises a bottom surface extending along the extending direction of the groove forming bone, put in the extending direction of the groove forming bone A width of the bottom surface in a direction orthogonal to the extending direction of the bottom surface is a height from the mold surface for forming the tread surface to the bottom surface. The width of the end surface in a direction perpendicular to the extending direction of the bottom surface is from the location connecting to the groove forming bone to the location connecting to the bottom surface. The both sides of the widened portion in the direction orthogonal to the extending direction of the bottom surface connect the both ends of the bottom surface in the width direction and the tread surface molding die surface, A central inclined side surface formed so that the distance between the tread surface molding mold surfaces increases as it goes toward the tread surface molding die surface, a portion at both ends in the width direction of the pair of end surfaces and the tread surface molding die surface are connected, G Toward the head face mold surface and wherein and an end portion inclined side surface which is formed such that the interval from each other spreads as the distance from the side surface of the groove forming bone into the central inclined side surface And
In the invention according to claim 3, the width W1 of the base end of the widened portion that intersects the tread surface molding die surface is the width of the base end of the groove forming bone that intersects the tread surface molding die surface. It is characterized by being formed with a size larger than W2 by 0.5 mm or more and 3.0 mm or less.
According to a fourth aspect of the present invention, a portion of the tread surface molding die surface that intersects with the widened portion penetrates a portion of the tire molding die that is positioned opposite to the tread surface molding die surface. A vent hole is formed.
The invention according to claim 5 is a tire manufactured by the tire molding die according to any one of claims 1 to 4.

本発明によれば、ウェアインジケータ成形用凹部は拡幅部の先部に形成され、タイヤの加硫成形時、拡幅部の周辺の箇所では、溝成形骨の周辺の箇所に比べてゴムの使用量が少なくなる。そのため、ウェアインジケータ成形用凹部の周辺箇所からウェアインジケータ成形用凹部に未加硫ゴムが流れ込む際、この未加硫ゴムの流れ込みが円滑に行われる。したがって、ウェアインジケータ成形用凹部の周辺でのボリューム不足、ゴム流れ不良による加硫故障を抑制する上で有利となり、タイヤの商品価値を高める上で有利となる。   According to the present invention, the wear indicator molding recess is formed at the front portion of the widened portion, and the amount of rubber used in the portion around the widened portion at the time of vulcanization molding of the tire compared to the portion around the groove forming bone Less. Therefore, when unvulcanized rubber flows into the wear indicator molding recess from the peripheral portion of the wear indicator molding recess, the unvulcanized rubber flows smoothly. Therefore, it is advantageous for suppressing vulcanization failure due to insufficient volume and rubber flow failure around the wear indicator molding recess, and advantageous for increasing the commercial value of the tire.

第１の実施の形態のタイヤ成形用金型の要部の斜視図である。It is a perspective view of the principal part of the metal mold | die for tire shaping | molding of 1st Embodiment. (Ａ)はタイヤ加硫時においてタイヤの径方向において第１の実施の形態のタイヤ成形用金型の外側からタイヤトレッド面を透視した図、（Ｂ）は(Ａ)のＢＢ矢視断面図、（Ｃ）は(Ａ)のＣＣ矢視断面図、（Ｄ）は(Ａ)のＤＤ矢視断面図である。(A) is the figure which saw through the tire tread surface from the outer side of the metal mold | die for tire shaping | molding of 1st Embodiment in the radial direction of a tire at the time of tire vulcanization, (B) is BB arrow sectional drawing of (A). (C) is CC sectional view taken on the line of (A), (D) is DD sectional drawing of (A). 成形されたタイヤの縦溝のウェアインジケータ部分の斜視図である。It is a perspective view of the wear indicator part of the longitudinal groove of the shape | molded tire. 第２の実施の形態のタイヤ成形用金型の要部の斜視図である。It is a perspective view of the principal part of the metal mold | die for tire shaping | molding of 2nd Embodiment. (Ａ)はタイヤ加硫時においてタイヤの径方向において第２の実施の形態のタイヤ成形用金型の外側からタイヤトレッド面を透視した図、（Ｂ）は(Ａ)のＢＢ矢視断面図、（Ｃ）は(Ａ)のＣＣ矢視断面図である。(A) is the figure which saw through the tire tread surface from the outer side of the metal mold | die for tire shaping | molding of 2nd Embodiment in the radial direction of a tire at the time of tire vulcanization, (B) is BB arrow sectional drawing of (A). , (C) is a cross-sectional view taken along the CC line in (A). 第３の実施の形態のタイヤ成形用金型の要部の斜視図である。It is a perspective view of the principal part of the metal mold | die for tire shaping | molding of 3rd Embodiment. (Ａ)はタイヤ加硫時においてタイヤの径方向において第３の実施の形態のタイヤ成形用金型の外側からタイヤトレッド面を透視した図、（Ｂ）は(Ａ)のＢＢ矢視断面図、（Ｃ）は(Ａ)のＣＣ矢視断面図である。(A) is the figure which saw through the tire tread surface from the outer side of the metal mold | die for tire shaping | molding of 3rd Embodiment in the radial direction of a tire at the time of tire vulcanization, (B) is BB arrow sectional drawing of (A). , (C) is a cross-sectional view taken along the CC line in (A).

以下、本発明の実施の形態を図面にしたがって説明する。
まず、図１〜図３を参照して第１の実施の形態から説明する。
タイヤ成形用金型１０は、トレッド面成形用金型面１２と、溝成形骨１４、１６と、ウェアインジケータ成形用凹部１８とを備えている。トレッド面成形用金型面１２は、タイヤ１０Ａのトレッド面１２Ａを成形するためのものである。一方の溝成形骨１４は、図２、図３に示すように、トレッド面１２Ａにタイヤ周方向に延在する縦溝１４Ａを成形するためのものである。他方の溝成形骨１６は、図２に示すように、トレッド面１２Ａにタイヤ周方向と交差する方向に延在する横溝１６Ａを成形するためのものである。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First, the first embodiment will be described with reference to FIGS.
The tire molding die 10 includes a tread surface molding die surface 12, groove forming bones 14 and 16, and a wear indicator molding recess 18. The mold surface 12 for forming the tread surface is for forming the tread surface 12A of the tire 10A. One groove forming bone 14 is for forming a vertical groove 14A extending in the tire circumferential direction on the tread surface 12A, as shown in FIGS. As shown in FIG. 2, the other groove forming bone 16 is for forming a lateral groove 16A extending in a direction intersecting the tire circumferential direction on the tread surface 12A.

ウェアインジケータ成形用凹部１８は、縦溝１４Ａの底部にウェアインジケータ１８Ａを成形するもので、一方の溝成形骨１４の突出方向の先部に形成されている。ウェアインジケータ成形用凹部１８は、溝成形骨１４の突出方向および溝成形骨１４の延在方向と直交する方向である幅方向に開放状に形成されている。
ウェアインジケータ成形用凹部１８が形成された溝成形骨１４の箇所は、ウェアインジケータ成形用凹部１８の底部からトレッド面成形用金型面１２に交わる箇所まで、溝成形骨１４の延在方向と直交する方向における幅が溝成形骨１４よりも大きな寸法の拡幅部２０として形成されている。 The wear indicator forming recess 18 forms the wear indicator 18A at the bottom of the longitudinal groove 14A, and is formed at the tip of the groove forming bone 14 in the protruding direction. The wear indicator forming recess 18 is formed in an open shape in the width direction, which is a direction orthogonal to the protruding direction of the groove forming bone 14 and the extending direction of the groove forming bone 14.
The location of the groove forming bone 14 in which the wear indicator forming recess 18 is formed is orthogonal to the extending direction of the groove forming bone 14 from the bottom of the wear indicator forming recess 18 to the location intersecting the tread surface forming mold surface 12. It is formed as the widened portion 20 whose width in the direction to be larger than that of the groove forming bone 14.

より詳細に説明すると、ウェアインジケータ成形用凹部１８の底部は、溝成形骨１４の延在方向に沿って延在する底面１８０２と、溝成形骨１４の延在方向における底面１８０２の両端箇所から起立し互いに対向する一対の端面１８０４とを有している。
底面１８０２の延在方向と直交する方向における底面１８０２の幅Ｗ３は、トレッド面成形用金型面１２から底面１８０２までの高さと等しい高さにおける溝成形骨１４の幅よりも大きい寸法で形成されている。
底面１８０２の延在方向と直交する方向における端面１８０４の幅Ｗ４は、溝成形骨１４に接続する箇所から底面１８０２に接続する箇所にむけて次第に大きくなる寸法で形成されている。 More specifically, the bottom portion of the wear indicator molding recess 18 stands from both the bottom surface 1802 extending along the extending direction of the groove forming bone 14 and the both ends of the bottom surface 1802 in the extending direction of the groove forming bone 14. And a pair of end faces 1804 facing each other.
The width W3 of the bottom surface 1802 in the direction orthogonal to the extending direction of the bottom surface 1802 is formed with a dimension larger than the width of the groove forming bone 14 at a height equal to the height from the tread surface molding die surface 12 to the bottom surface 1802. ing.
The width W4 of the end surface 1804 in the direction orthogonal to the extending direction of the bottom surface 1802 is formed with a dimension that gradually increases from the location connecting to the groove forming bone 14 to the location connecting to the bottom surface 1802.

底面１８０２の延在方向と直交する方向における拡幅部２０の両側部は、それぞれ中央傾斜側面２００２と２つの端部傾斜側面２００４で形成されている。
中央傾斜側面２００２は、底面１８０２の幅方向両端の箇所とトレッド面成形用金型面１２とを接続し、トレッド面成形用金型面１２に向かうにつれて互いに間隔が拡がるように形成されている。
端部傾斜側面２００４は、互いに対向する一対の端面１８０４の幅方向両端の箇所とトレッド面成形用金型面１２とを接続し、トレッド面成形用金型面１２に向かうにつれて、かつ、溝成形骨１４の側面１４０２から中央傾斜側面２００２に至るにつれて互いに間隔が拡がるように形成されている。 Both side portions of the widened portion 20 in the direction orthogonal to the extending direction of the bottom surface 1802 are formed by a central inclined side surface 2002 and two end inclined side surfaces 2004, respectively.
The central inclined side surfaces 2002 are connected to the tread surface molding mold surface 12 at locations at both ends in the width direction of the bottom surface 1802 and are formed so that the distance between the center inclined side surfaces 2002 increases toward the tread surface molding mold surface 12.
The end inclined side surfaces 2004 connect the locations at both ends in the width direction of the pair of end surfaces 1804 facing each other and the tread surface molding die surface 12, and are formed into grooves as they move toward the tread surface molding die surface 12. The distance is increased from the side surface 1402 of the bone 14 to the central inclined side surface 2002.

トレッド面成形用金型面１２に交わる拡幅部２０の基端の幅Ｗ１は、トレッド面成形用金型面１２に交わる溝成形骨１４の基端の幅Ｗ２よりも０.５ｍｍ以上３.０ｍｍ以下の大きな寸法で形成されている。
より詳細には、トレッド面成形用金型面１２に交わる中央傾斜側面２００２の下端の幅Ｗ１は、トレッド面成形用金型面１２に交わる溝成形骨１４の側面１４０２の下端の幅Ｗ２よりも０.５ｍｍ以上３.０ｍｍ以下の大きな寸法で形成されている。幅Ｗ１−幅Ｗ２の値が０.５ｍｍよりも小さいと、加硫故障を抑制する効果が少なくなり、また、幅Ｗ１−幅Ｗ２の値が３ｍｍよりも大きくなると、バランス不良が生じタイヤの偏摩耗が生じやすくなるためである。 The width W1 of the base end of the widened portion 20 that intersects the tread surface molding die surface 12 is 0.5 mm or more and 3.0 mm greater than the width W2 of the base end of the groove forming bone 14 that intersects the tread surface molding die surface 12. It is formed with the following large dimensions.
More specifically, the width W1 of the lower end of the central inclined side surface 2002 that intersects the tread surface molding die surface 12 is larger than the width W2 of the lower end of the side surface 1402 of the groove forming bone 14 that intersects the tread surface molding die surface 12. It is formed with a large dimension of 0.5 mm or more and 3.0 mm or less. If the value of the width W1-width W2 is smaller than 0.5 mm, the effect of suppressing the vulcanization failure is reduced, and if the value of the width W1-width W2 is larger than 3 mm, imbalance is caused and the tire is uneven. This is because wear tends to occur.

次に、作用、効果について説明する。
タイヤの加硫成形時、未加硫のゴムは、タイヤ成形用金型１０内において、ウェアインジケータ成形用凹部１８の周辺箇所からウェアインジケータ成形用凹部１８に流れ込む。
本実施の形態では、ウェアインジケータ成形用凹部１８は拡幅部２０の先部に形成され、拡幅部２０は、溝成形骨１４の延在方向と直交する方向における幅が溝成形骨１４よりも大きな寸法で形成されているため、拡幅部２０の周辺の箇所では、溝成形骨１４の周辺の箇所よりもゴムの使用量が少なくなる。
そのため、ウェアインジケータ成形用凹部１８の周辺箇所からウェアインジケータ成形用凹部１８に未加硫ゴムが流れ込む際、この未加硫ゴムの流れ込みが円滑に行われる。したがって、ウェアインジケータ成形用凹部１８の周辺のボリューム不足、ゴム流れ不良による加硫故障を抑制する上で有利となり、タイヤの商品価値を高める上で有利となる。 Next, functions and effects will be described.
At the time of vulcanization molding of the tire, unvulcanized rubber flows into the wear indicator molding recess 18 from the periphery of the wear indicator molding recess 18 in the tire molding die 10.
In the present embodiment, the wear indicator forming recess 18 is formed at the front portion of the widened portion 20, and the widened portion 20 is larger in width in the direction perpendicular to the extending direction of the groove forming bone 14 than the groove forming bone 14. Since it is formed with dimensions, the amount of rubber used is less in the area around the widened portion 20 than in the area around the groove forming bone 14.
Therefore, when unvulcanized rubber flows into the wear indicator molding recess 18 from the peripheral portion of the wear indicator molding recess 18, the unvulcanized rubber flows smoothly. Thus, near the lack of volume wear indicator molding recess 18, it is advantageous in suppressing vulcanization failure of a rubber flow failure, which is advantageous in enhancing the commercial value of the tire.

次に、図４、図５を参照して第２の実施の形態について説明する。なお、以下の実施の形態では、第１の実施の形態と同様な箇所に同一の符号を付して説明する。
第２の実施の形態では、第１の実施の形態に加え、拡幅部２０と交わるトレッド面成形用金型面１２の箇所に、拡幅部２０の延在方向に沿って延在するエア逃がし用凹部３０を形成したものである。
より詳細には、中央傾斜側面２００２と交わるトレッド面成形用金型面１２の箇所に、拡幅部２０の延在方向に沿って延在するエア逃がし用凹部３０を形成したものである。
このエア逃がし用凹部３０は、未加硫のゴムがウェアインジケータ成形用凹部１８の周辺箇所からウェアインジケータ成形用凹部１８に流れ込む際に、加硫中のグリーンタイヤとタイヤ成形用金型１０との間に残存するエアをタイヤ成形用金型１０側に逃がすためのものである。
このようなエア逃がし用凹部３０を設けると、タイヤの加硫成形時、エア溜りなどを抑制し、加硫故障を抑制する上でより一層有利となる。 Next, a second embodiment will be described with reference to FIGS. In the following embodiments, the same reference numerals are given to the same portions as those in the first embodiment.
In the second embodiment, in addition to the first embodiment, for air release extending along the extending direction of the widened portion 20 at a portion of the mold surface 12 for forming the tread surface that intersects with the widened portion 20. A recess 30 is formed.
More specifically, an air relief recess 30 extending along the extending direction of the widened portion 20 is formed at a location on the tread surface molding die surface 12 that intersects the central inclined side surface 2002.
The air escape recess 30 is formed between the green tire being vulcanized and the tire molding die 10 when unvulcanized rubber flows into the wear indicator molding recess 18 from the peripheral portion of the wear indicator molding recess 18. This is for releasing the air remaining between them to the tire molding die 10 side.
Providing such an air escape recess 30 is even more advantageous in suppressing air stagnation and suppressing vulcanization failures during tire vulcanization molding.

次に、図６、図７を参照して第３の実施の形態について説明する。
第３の実施の形態では、第１の実施の形態に加え、拡幅部２０と交わるトレッド面成形用金型面１２の箇所に、トレッド面成形用金型面１２と反対に位置するタイヤ成形用金型１０の箇所に貫通するベントホール３２を形成したものである。
より詳細には、中央傾斜側面２００２と交わるトレッド面成形用金型面１２の箇所に、トレッド面成形用金型面１２と反対に位置するタイヤ成形用金型１０の箇所に貫通するベントホール３２を形成したものである。
ベントホール３２は、もともとグリーンタイヤとタイヤ成形用金型１０との間に残存するエアをタイヤ成形用金型１０の外部に排出するためにトレッド面成形用金型面１２の多数の箇所に形成される。なお、図７(Ｃ)において符号３２Ａは、ベントホール３２に未加硫ゴムが流れ込んで形成されるベントを示す。 Next, a third embodiment will be described with reference to FIGS.
In the third embodiment, in addition to the first embodiment, the tire molding is located at the location of the tread surface molding die surface 12 intersecting with the widened portion 20, opposite to the tread surface molding die surface 12. A vent hole 32 penetrating the mold 10 is formed.
More specifically, a vent hole 32 penetrating through a portion of the tire molding die 10 positioned opposite to the tread surface molding die surface 12 at a location of the tread surface molding die surface 12 intersecting with the central inclined side surface 2002. Is formed.
The vent holes 32 are originally formed at a number of locations on the tread surface molding die surface 12 in order to discharge the air remaining between the green tire and the tire molding die 10 to the outside of the tire molding die 10. Is done. In FIG. 7C, reference numeral 32A denotes a vent formed by unvulcanized rubber flowing into the vent hole 32.

このようなベントホール３２を拡幅部２０と交わるトレッド面成形用金型面１２の箇所に配置すると、タイヤの加硫成形時、未加硫のゴムがウェアインジケータ成形用凹部１８の周辺箇所からウェアインジケータ成形用凹部に流れ込む際に、ウェアインジケータ成形用凹部１８の周辺に残存するエアをタイヤ成形用金型１０の外部に排出でき、加硫故障を抑制する上でより一層有利となる。
この例では、図６、図７(Ａ)に示すように、ベントホール３２を拡幅部２０の両側に一つずつ設けたが、ベントホール３２を設ける数は任意である。
また、ベントホール３２は、第２の実施の形態のエア逃がし用凹部３０に開口させて設けるようにしてもよく、ベントホール３２をエア逃がし用凹部３０に開口させて設けると、加硫故障を抑制する上でより一層有利となる。 When such a vent hole 32 is arranged at a location on the tread surface molding die surface 12 that intersects with the widened portion 20, unvulcanized rubber is worn from the peripheral portion of the wear indicator molding recess 18 at the time of vulcanization molding of the tire. When flowing into the indicator molding recess, air remaining around the wear indicator molding recess 18 can be discharged to the outside of the tire molding die 10, which is further advantageous in suppressing vulcanization failure.
In this example, as shown in FIGS. 6 and 7A, one vent hole 32 is provided on each side of the widened portion 20, but the number of the vent holes 32 is arbitrary.
Further, the vent hole 32 may be provided so as to be opened in the air escape recess 30 of the second embodiment. If the vent hole 32 is provided in the air escape recess 30, an vulcanization failure may occur. This is even more advantageous in terms of suppression.

タイヤサイズ１９５／６５Ｒ１５の試験タイヤを、表１の仕様に基づく従来品のタイヤ成形用金型、実施例１〜５のタイヤ成形用金型を用いて２０本ずつ試作し、評価した。   20 test tires having a tire size of 195 / 65R15 were prototyped and evaluated using the conventional tire molds based on the specifications shown in Table 1 and the tire molds of Examples 1-5.

Figure 0005664111
Figure 0005664111

評価は、加硫故障について目視による外観検査にて、発生個数、大きさを各試作タイヤ毎に総合判断し、３段階の評価Ａ、Ｂ、Ｃを行った。評価Ａは、一見した場合に多少の加硫故障を発見できるが出荷可能レベルに達しているタイヤである。評価Ｂは、凝視した場合に多少の加硫故障を発見できるが一見した場合には加硫故障を発見できないより品質の高いタイヤである。評価Ｃは、凝視した場合でも加硫故障を発見できないさらに品質の高いタイヤである。
表１においてＷ１−Ｗ２の値(ｍｍ)は、トレッド面成形用金型面１２に交わる中央傾斜側面２００２の下端の幅Ｗ１から、トレッド面成形用金型面１２に交わる溝成形骨１４の側面１４０２の下端の幅Ｗ２を引いた値である。
また、表１において、エア逃がし用凹部の幅は０.６ｍｍで、深さは０.３ｍｍとし、ベントホールの直径は０.８ｍｍとした。
表１から明らかなように、本発明のタイヤ成形用金型１０によれば、加硫故障を抑制する上で有利となり、タイヤの商品価値を高める上で不利となる。 The evaluation was performed by visual inspection of the vulcanization failure, and the generation number and size were comprehensively determined for each prototype tire, and three-level evaluations A, B, and C were performed. Evaluation A is a tire that can be found at a glance, but has reached a level that can be shipped, although some vulcanization failures can be found. Evaluation B is a higher quality tire that can detect some vulcanization failure when staring, but cannot detect vulcanization failure at first glance. Evaluation C is a higher quality tire that cannot find a vulcanization failure even when staring.
In Table 1, the value (mm) of W1-W2 is determined from the width W1 of the lower end of the central inclined side surface 2002 that intersects the tread surface molding die surface 12, and the side surface of the groove forming bone 14 that intersects the tread surface molding die surface 12. This is a value obtained by subtracting the width W2 of the lower end of 1402.
In Table 1, the width of the air escape recess is 0.6 mm, the depth is 0.3 mm, and the diameter of the vent hole is 0.8 mm.
As is apparent from Table 1, the tire molding die 10 of the present invention is advantageous in suppressing vulcanization failure and disadvantageous in increasing the commercial value of the tire.

なお、本発明のタイヤ成形用金型１０は、トレッド成形部をタイヤ赤道面で分離した２つ割り型や、トレッド成形部をタイヤ周方向に複数に分割したセクショナル型などの全ての形式の金型に広く適用される。   The tire molding die 10 according to the present invention includes all types of molds such as a split mold in which the tread molded portion is separated by the tire equatorial plane and a sectional mold in which the tread molded portion is divided into a plurality of portions in the tire circumferential direction. Widely applied to mold.

１０……タイヤ成形用金型、１２……トレッド面成形用金型面、１４、１６……溝成形骨、１８……ウェアインジケータ成形用凹部、１８０２……底面、１８０４……端面、２０……拡幅部、２００２……中央傾斜側面、２００４……端部傾斜側面、３０……エア逃がし用凹部、３２……ベントホール。   DESCRIPTION OF SYMBOLS 10 ... Tire molding die, 12 ... Tread surface molding die surface, 14, 16 ... Groove forming bone, 18 ... Wear indicator molding recessed part, 1802 ... Bottom surface, 1804 ... End surface, 20 ... ... widened part, 2002 ... central inclined side surface, 2004 ... end inclined side surface, 30 ... air escape recess, 32 ... vent hole.

Claims (5)

トレッド面を成形するためのトレッド面成形用金型面と、前記トレッド面成形用金型面から突設された縦溝または横溝を成形するための溝成形骨と、前記溝成形骨の突出方向の先部に形成されウェアインジケータを成形するためのウェアインジケータ成形用凹部とを備えるタイヤ成形用金型であって、
前記ウェアインジケータ成形用凹部が形成された前記溝成形骨の箇所は、前記ウェアインジケータ成形用凹部の底部から前記トレッド面成形用金型面に交わる箇所まで、前記溝成形骨の延在方向と直交する方向における幅が前記溝成形骨よりも大きな寸法の拡幅部として形成され、
前記拡幅部と交わる前記トレッド面成形用金型面の箇所に、前記拡幅部の延在方向に沿って延在するエア逃がし用凹部が形成されている、
ことを特徴とするタイヤ成形用金型。 Tread surface forming mold surface for forming the tread surface, groove forming bone for forming vertical grooves or horizontal grooves protruding from the tread surface forming mold surface, and the protruding direction of the groove forming bone A mold for forming a tire provided with a concave portion for forming a wear indicator for forming a wear indicator formed at the tip of the tire,
The groove forming bone portion in which the wear indicator forming recess is formed is orthogonal to the extending direction of the groove forming bone from the bottom of the wear indicator forming recess to the portion intersecting the tread surface forming mold surface. The width in the direction to be formed as a widened portion having a larger dimension than the groove-formed bone ,
An air escape recess extending along the extending direction of the widened portion is formed at a location on the mold surface for molding the tread surface that intersects with the widened portion,
A tire molding die characterized by the above. トレッド面を成形するためのトレッド面成形用金型面と、前記トレッド面成形用金型面から突設された縦溝または横溝を成形するための溝成形骨と、前記溝成形骨の突出方向の先部に形成されウェアインジケータを成形するためのウェアインジケータ成形用凹部とを備えるタイヤ成形用金型であって、
前記ウェアインジケータ成形用凹部が形成された前記溝成形骨の箇所は、前記ウェアインジケータ成形用凹部の底部から前記トレッド面成形用金型面に交わる箇所まで、前記溝成形骨の延在方向と直交する方向における幅が前記溝成形骨よりも大きな寸法の拡幅部として形成され、
前記ウェアインジケータ成形用凹部の底部は、前記溝成形骨の延在方向に沿って延在する底面と、前記溝成形骨の延在方向における前記底面の両端箇所から起立し互いに対向する一対の端面とを有し、
前記底面の延在方向と直交する方向における前記底面の幅は、前記トレッド面成形用金型面から前記底面までの高さにおける前記溝成形骨の幅よりも大きい寸法で形成され、
前記底面の延在方向と直交する方向における前記端面の幅は、前記溝成形骨に接続する箇所から前記底面に接続する箇所にむけて次第に大きくなる寸法で形成され、
前記底面の延在方向と直交する方向における前記拡幅部の両側部は、前記底面の幅方向両端の箇所と前記トレッド面成形用金型面とを接続し、前記トレッド面成形用金型面に向かうにつれて互いに間隔が拡がるように形成された中央傾斜側面と、前記一対の端面の幅方向両端の箇所と前記トレッド面成形用金型面とを接続し、前記トレッド面成形用金型面に向かうにつれて、かつ、前記溝成形骨の側面から前記中央傾斜側面に至るにつれて互いに間隔が拡がるように形成された端部傾斜側面とを有している、
ことを特徴とするタイヤ成形用金型。 Tread surface forming mold surface for forming the tread surface, groove forming bone for forming vertical grooves or horizontal grooves protruding from the tread surface forming mold surface, and the protruding direction of the groove forming bone A mold for forming a tire provided with a concave portion for forming a wear indicator for forming a wear indicator formed at the tip of the tire,
The groove forming bone portion in which the wear indicator forming recess is formed is orthogonal to the extending direction of the groove forming bone from the bottom of the wear indicator forming recess to the portion intersecting the tread surface forming mold surface. The width in the direction to be formed as a widened portion having a larger dimension than the groove-formed bone ,
The bottom of the concave portion for forming the wear indicator has a bottom surface extending along the extending direction of the groove forming bone and a pair of end surfaces that stand from both ends of the bottom surface in the extending direction of the groove forming bone and face each other. And
The width of the bottom surface in the direction orthogonal to the extending direction of the bottom surface is formed with a dimension larger than the width of the groove-forming bone at the height from the tread surface molding die surface to the bottom surface,
The width of the end surface in the direction orthogonal to the extending direction of the bottom surface is formed with a dimension that gradually increases from the location connected to the groove-forming bone to the location connected to the bottom surface,
Both side portions of the widened portion in the direction orthogonal to the extending direction of the bottom surface connect locations at both ends of the bottom surface in the width direction and the mold surface for molding the tread surface, and the mold surface for molding the tread surface. The central inclined side surface formed so that the distance between the two end surfaces increases as it goes, the both ends in the width direction of the pair of end surfaces, and the tread surface molding die surface are connected to each other toward the tread surface molding die surface. And an end inclined side surface formed so that a distance from each other increases from the side surface of the grooved bone to the central inclined side surface.
A tire molding die characterized by the above. 前記トレッド面成形用金型面に交わる前記拡幅部の基端の幅Ｗ１は、前記トレッド面成形用金型面に交わる前記溝成形骨の基端の幅Ｗ２よりも０.５ｍｍ以上３.０ｍｍ以下の大きな寸法で形成されている、
ことを特徴とする請求項１または２記載のタイヤ成形用金型。 The width W1 of the base end of the widened portion that intersects the tread surface molding die surface is 0.5 mm or more and 3.0 mm greater than the width W2 of the base end of the groove forming bone that intersects the tread surface molding die surface. It is formed with the following large dimensions,
The tire molding die according to claim 1 or 2 . 前記拡幅部と交わる前記トレッド面成形用金型面の箇所に、前記トレッド面成形用金型面と反対に位置する前記タイヤ成形用金型の箇所に貫通するベントホールが形成されている、
ことを特徴とする請求項１乃至３に何れか１項記載のタイヤ成形用金型。 A vent hole penetrating the portion of the mold for molding the tire located opposite to the mold surface for molding the tread surface is formed at a location of the mold surface for molding the tread surface intersecting with the widened portion,
The tire molding die according to any one of claims 1 to 3, wherein the tire molding die is provided. 請求項１乃至４の何れか１項記載のタイヤ成形用金型により製造されたタイヤ。  A tire manufactured by the tire molding die according to any one of claims 1 to 4.
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