JP5753427B2 - Post cure inflation device - Google Patents

Post cure inflation device Download PDF

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JP5753427B2
JP5753427B2 JP2011084760A JP2011084760A JP5753427B2 JP 5753427 B2 JP5753427 B2 JP 5753427B2 JP 2011084760 A JP2011084760 A JP 2011084760A JP 2011084760 A JP2011084760 A JP 2011084760A JP 5753427 B2 JP5753427 B2 JP 5753427B2
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tire
cooling
vulcanization
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cooling water
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誠 東方
誠 東方
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Sumitomo Rubber Industries Ltd
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Description

本発明は、加硫直後の空気入りタイヤを迅速に冷却するポストキュアインフレート（ＰＣＩ）装置に関する。   The present invention relates to a post-cure inflation (PCI) apparatus that rapidly cools a pneumatic tire immediately after vulcanization.

空気入りタイヤでは、タイヤの骨格をなすカーカスのカーカスコードとして、ナイロン、ポリエステル等の有機繊維コードが広く使用されている。しかし、空気入りタイヤの製造工程において、加硫金型から取り出された加硫済みの高温のタイヤをそのまま自然冷却すると、前記有機繊維コードが大きく収縮してタイヤが変形し、タイヤのユニフォミティを損ねるという問題が生じる。   In pneumatic tires, organic fiber cords such as nylon and polyester are widely used as carcass cords for carcass forming the skeleton of the tire. However, when the vulcanized high-temperature tire taken out from the vulcanization mold is naturally cooled in the production process of the pneumatic tire, the organic fiber cord is greatly contracted and the tire is deformed, thereby impairing the tire uniformity. The problem arises.

そこで従来においては、加硫金型から取り出された加硫済みのタイヤは、ポストキュアインフレート（ＰＣＩ）装置において、タイヤ内部に圧縮空気を充填し、形状を適正に保持したインフレート状態を保ちながら、前記有機繊維コードの収縮が収まる温度以下（通常１００℃以下、好ましくは８０℃以下）になるまで自然冷却している。   Therefore, conventionally, a vulcanized tire taken out from a vulcanization mold is maintained in an inflated state in which the inside of the tire is filled with compressed air and the shape is properly maintained in a post cure inflate (PCI) device. However, the organic fiber cord is naturally cooled until it reaches a temperature at which the shrinkage of the organic fiber cord is reduced (usually 100 ° C. or lower, preferably 80 ° C. or lower).

しかし近年においては、タイヤの生産効率を高めるために、加硫工程時間に連動してタイヤのＰＣＩ工程時間（冷却時間）を短縮させることが要求されている。   However, in recent years, in order to increase tire production efficiency, it is required to shorten the tire PCI process time (cooling time) in conjunction with the vulcanization process time.

ここで、加硫金型から取り出された加硫済みのタイヤは、速やかにＰＣＩ工程に投入してインフレート状態に保つことが必要であり、もしＰＣＩ工程時間に比して加硫工程時間が短い場合には、加硫金型から取り出されたタイヤがＰＣＩ工程前で待機させられてしまい、この待機中での冷却によってユニフォミティの低下が発生する。従って、タイヤの製造工程では、前記待機が生じないようにＰＣＩ工程時間と加硫工程時間とを連動させることが必要となる。そして近年、加硫金型の構造、加熱効率、ゴム物性等の改善によって加硫工程時間を短縮することが種々提案されているが、前述の如くＰＣＩ工程時間と加硫工程時間とを連動させる必要があるため、このＰＣＩ工程時間がネックとなって加硫工程時間の短縮が実施できず、生産効率を向上できないという問題がある。   Here, the vulcanized tire taken out from the vulcanization mold needs to be quickly put into the PCI process and kept in an inflated state, and if the vulcanization process time is compared with the PCI process time, If it is short, the tire taken out from the vulcanization mold is put on standby before the PCI process, and the uniformity is reduced by cooling during this standby. Accordingly, in the tire manufacturing process, it is necessary to link the PCI process time and the vulcanization process time so that the standby does not occur. In recent years, various proposals have been made to shorten the vulcanization process time by improving the structure, heating efficiency, rubber physical properties, etc. of the vulcanization mold. As described above, the PCI process time and the vulcanization process time are linked. Therefore, there is a problem that the PCI process time becomes a bottleneck and the vulcanization process time cannot be shortened and the production efficiency cannot be improved.

なお、下記の特許文献１には、加硫金型から取り出された加硫済みのタイヤに対し、ＰＣＩ工程に投入する直前に空気を吹き付け、ＰＣＩ効果が充分生じる範囲の下限温度（１３０℃程度）まで予め強制冷却することが提案されている。しかしこの場合、下限温度が制限されているためＰＣＩ工程時間の短縮は不充分である。しかも、下限温度に応じた強制冷却のコントロールが難しいため、カーカスコードに収縮を招いてタイヤ変形を発生させる危険性がある。   In Patent Document 1 below, air is blown on a vulcanized tire taken out from a vulcanization mold immediately before being put into the PCI process, and a lower limit temperature (about 130 ° C.) in a range where a sufficient PCI effect is produced. It has been proposed to perform forced cooling in advance. In this case, however, the lower limit temperature is limited, so that the PCI process time cannot be shortened sufficiently. In addition, since it is difficult to control forced cooling according to the lower limit temperature, there is a risk that the carcass cord contracts and tire deformation occurs.

特開昭６１−３４３６９号公報JP 61-34369 A

そこで本発明は、インフレート状態で保持する加硫直後の空気入りタイヤに対して、そのサイドウォール部のみをを冷却水を用いて冷却することを基本として、有機繊維コードの収縮によるタイヤ変形を抑えてユニフォミティを維持しながら、ＰＣＩ工程時間を充分に短縮でき、タイヤの生産効率の向上を図りうるポストキュアインフレート装置を提供することを目的としている。   Therefore, the present invention is based on the fact that only a sidewall portion of a pneumatic tire immediately after vulcanization held in an inflated state is cooled with cooling water, and the tire is deformed by contraction of the organic fiber cord. An object of the present invention is to provide a post-cure inflation device that can sufficiently reduce the PCI process time and improve the tire production efficiency while maintaining uniformity.

上記課題を解決するために、本願請求項１の発明は、加硫直後の空気入りタイヤを冷却するポストキュアインフレート装置であって、
加硫直後の空気入りタイヤをインフレート状態で保持するタイヤ保持手段と、
該インフレート状態で保持された空気入りタイヤの上下のサイドウォール部を、それぞれ冷却水を用いて冷却する冷却手段とを具えるとともに、
前記冷却手段は、
前記サイドウォール部の外表面に対して接離可能にタイヤ軸心方向に相対移動しうる中空円筒状をなし、しかもサイドウォール部の外表面に当接することにより該サイドウォールの外表面との間でタイヤ周方向に連続してのびる環状の密閉空間を形成しうる環状凹部と、前記密閉空間に冷却水を注入する注入口と、注入された冷却水を密閉空間から排出する排出口とを有する上下一対の当接体、
及び各前記当接体を、前記サイドウォール部の外表面に対して接離可能にタイヤ軸心方向に相対移動させる移動手段を具え、
前記当接体は、前記サイドウォール部の外表面と当接する当接部に、弾性変形しうるクッション体を具えることを特徴としている。
In order to solve the above-mentioned problem, the invention of claim 1 of the present application is a post-cure inflation device for cooling a pneumatic tire immediately after vulcanization,
Tire holding means for holding the pneumatic tire immediately after vulcanization in an inflated state;
Cooling means for cooling the upper and lower sidewall portions of the pneumatic tire held in the inflated state using cooling water, respectively,
The cooling means is
It has a hollow cylindrical shape that can move relative to the outer surface of the sidewall part so as to be movable toward and away from the tire axis, and is in contact with the outer surface of the sidewall part by contacting the outer surface of the sidewall part. An annular recess that can form an annular sealed space extending continuously in the tire circumferential direction, an inlet for injecting cooling water into the sealed space, and an outlet for discharging the injected cooling water from the sealed space A pair of upper and lower contact bodies,
And each said abutment body, immediately give a moving means for separable therefrom relative movement in the tire axial direction with respect to the outer surface of the side wall portion,
The contact body includes a cushion body that is elastically deformable at a contact portion that contacts the outer surface of the sidewall portion .

本発明は叙上の如く、加硫直後の空気入りタイヤをインフレート状態で保持するタイヤ保持手段と、インフレート状態で保持された前記空気入りタイヤの上下のサイドウォール部を、それぞれ冷却水を用いて冷却する冷却手段とを具える。   As described above, the present invention provides a tire holding means for holding a pneumatic tire immediately after vulcanization in an inflated state, and upper and lower sidewall portions of the pneumatic tire held in an inflated state, respectively, with cooling water. Cooling means for cooling using.

前記サイドウォール部は、コード収縮によって最もタイヤ変形が生じやすい部位である。従って、この部位をインフレート状態で冷却水を用いて強制冷却することにより、高い信頼性を有しながらタイヤ変形を効果的にかつ確実に抑制でき、ＰＣＩ工程時間の大幅な短縮を図ることが可能となる。   The sidewall portion is a portion where tire deformation is most likely to occur due to cord contraction. Therefore, by forcedly cooling this part with cooling water in an inflated state, tire deformation can be effectively and reliably suppressed with high reliability, and the PCI process time can be greatly shortened. It becomes possible.

又前記サイドウォール部は、ゴム厚さが小であるため加硫の進行が早い、即ち過加硫になりやすい部位である。従って、このサイドウォール部のみを冷却し、加硫の進行が遅いトレッド部及びビード部においては冷却しないため、このトレッド部及びビード部ではＰＣＩ工程中に加硫を進行させることができ、加硫度を均一化させ、タイヤ品質を向上させるという効果も奏することもできる。なおトレッド部及びビード部は、ゴム厚さが大でありカーカスコードがこのゴムに拘束されて収縮し難くなるため、ＰＣＩ工程を終了させた時点で、トレッド部及びビード部の温度が、有機繊維コードの収縮が収まる温度（通常１００℃）以上であっても、サイドウォール部の温度が前記温度以下となれば、ＰＣＩ効果を得ることができる。   Further, the side wall portion is a portion where rubber progresses quickly, that is, the vulcanization progresses quickly, that is, it tends to be over-vulcanized. Therefore, only the sidewall portion is cooled, and the tread portion and the bead portion where the progress of vulcanization is slow is not cooled. Therefore, the vulcanization can be advanced during the PCI process in the tread portion and the bead portion. It is also possible to achieve the effect of uniforming the degree and improving the tire quality. Since the tread portion and the bead portion have a large rubber thickness and the carcass cord is restrained by the rubber and is difficult to shrink, the temperature of the tread portion and the bead portion is changed to the organic fiber when the PCI process is finished. Even if the temperature of the cord shrinkage is higher (usually 100 ° C.) or higher, the PCI effect can be obtained if the temperature of the side wall portion is lower than the above temperature.

本発明のポストキュアインフレート装置の一実施例を示す断面図である。It is sectional drawing which shows one Example of the post-cure inflation apparatus of this invention. その主要部を示す斜視図である。It is a perspective view which shows the principal part. その主要部を拡大して示す断面図である。It is sectional drawing which expands and shows the principal part. 本発明のポストキュアインフレート装置によるサイドウォール部の温度変化を示すグラフである。It is a graph which shows the temperature change of the side wall part by the post-cure inflation apparatus of this invention.

以下、本発明の実施の形態について、詳細に説明する。
図１に示すように、本実施形態のポストキュアインフレート装置１は、加硫直後の空気入りタイヤＴをインフレート状態で横向きに保持するタイヤ保持手段２と、インフレート状態で保持された前記空気入りタイヤＴの上下のサイドウォール部ＴＳを、それぞれ冷却水を用いて冷却する冷却手段３とを具える。 Hereinafter, embodiments of the present invention will be described in detail.
As shown in FIG. 1, the post-cure inflating device 1 of the present embodiment includes a tire holding means 2 that holds a pneumatic tire T immediately after vulcanization in an inflated state, and the above-described inflated state. Cooling means 3 is provided for cooling the upper and lower sidewall portions TS of the pneumatic tire T using cooling water.

前記タイヤ保持手段２は、上下に距離を隔てて向かい合わせで配される一対のリム体５Ａ、５Ｂと、少なくとも一方のリム体を他方のリム体に対して近離移動させる昇降具６とを含んで構成される。   The tire holding means 2 includes a pair of rim bodies 5A and 5B that are arranged facing each other at a distance in the vertical direction, and an elevating tool 6 that moves at least one rim body toward and away from the other rim body. Consists of including.

前記リム体５Ａ、５Ｂは、円盤状の基体７の外周に、空気入りタイヤＴのビード部ＴＢを着座させて保持するビード保持凹部７ａを形成した周知構造をなす。又本例では、前記下のリム体５Ｂは、下の取付け台８Ｂに立設される支持軸９に交換自在に取り付けられるとともに、前記上のリム体５Ａは、上の取付け台８Ａに固定のシリンダ１０のロッド下端に交換自在に取り付けられる。従って、本例では前記シリンダ１０が、上のリム体５Ａを下のリム体５Ｂに対して近離移動させる昇降具６を構成している。このタイヤ保持手段２では、前記シリンダ１０のロッドの伸張とともに上のリム体５Ａが下降し、前記下のリム体５Ｂとの間で空気入りタイヤＴを横向きで保持することができる。又前記支持軸９には、前記上下のリム体５Ａ、５Ｂで支持された空気入りタイヤＴの内腔Ｈ内に圧縮空気を充填してインフレート状態とする圧縮空気給排流路３０が形成される。なお前記リム体５Ａ、５Ｂを総称するときリム体５と呼ぶ。   The rim bodies 5A and 5B have a well-known structure in which a bead holding recess 7a is formed on the outer periphery of the disc-shaped base body 7 to seat and hold the bead portion TB of the pneumatic tire T. In the present example, the lower rim body 5B is interchangeably attached to a support shaft 9 erected on the lower mounting base 8B, and the upper rim body 5A is fixed to the upper mounting base 8A. It is attached to the lower end of the rod of the cylinder 10 in a replaceable manner. Therefore, in the present example, the cylinder 10 constitutes the lifting tool 6 that moves the upper rim body 5A toward and away from the lower rim body 5B. In the tire holding means 2, the upper rim body 5 </ b> A descends as the rod of the cylinder 10 extends, and the pneumatic tire T can be held sideways with the lower rim body 5 </ b> B. Further, the support shaft 9 is formed with a compressed air supply / discharge passage 30 that fills the inner cavity H of the pneumatic tire T supported by the upper and lower rim bodies 5A, 5B to make it inflated. Is done. The rim bodies 5A and 5B are collectively referred to as a rim body 5.

次に、前記冷却手段３は、前記サイドウォール部ＴＳの外表面ＴＳｓ（以下サイドウォール面ＴＳｓという場合がある。）に対して接離可能にタイヤ軸心方向内外に相対移動しうる中空円筒状の上下一対の当接体１１Ａ、１１Ｂと、この当接体１１Ａ、１１Ｂを前記相対移動させる移動手段１２とを具える。なお前記当接体１１Ａ、１１Ｂを総称するとき、当接体１１と呼ぶ。   Next, the cooling means 3 is a hollow cylindrical shape that can move relative to the inside and outside of the tire axial center so as to be able to contact and separate from the outer surface TSs of the sidewall portion TS (hereinafter also referred to as a sidewall surface TSs). A pair of upper and lower contact bodies 11A, 11B and a moving means 12 for moving the contact bodies 11A, 11B relative to each other. The contact bodies 11A and 11B are collectively referred to as the contact body 11.

又前記当接体１１は、図２、３に示すように、サイドウォール面ＴＳｓに当接することにより該サイドウォール面ＴＳｓとの間でタイヤ周方向に連続してのびる環状の密閉空間Ｊを形成しうる環状凹部１３と、前記密閉空間Ｊ内に冷却水を注入する注入口１４と、注入された冷却水を密閉空間から排出する排出口１５とを具える。   As shown in FIGS. 2 and 3, the abutment body 11 abuts against the sidewall surface TSs to form an annular sealed space J extending continuously in the tire circumferential direction with the sidewall surface TSs. And a discharge port 15 for discharging the injected cooling water from the sealed space.

具体的には本例の当接体１１は、先端部がサイドウォール面ＴＳｓに当接しうる当接部１６Ｅをなすタイヤ半径方向内側の内周壁片１６と、先端部がサイドウォール面ＴＳｓに当接しうる当接部１７Ｅをなすタイヤ半径方向外側の外周壁片１７と、この内周壁片１６および外周壁片１７の各後端部間を継く継ぎ壁片１８とを有する本例では断面略コ字状の円筒状基体１９を具える。この円筒状基体１９は、前記内周壁片１６と外周壁片１７と継ぎ壁片１８とで囲まれかつサイドウォール面ＴＳｓに向かって開口する環状凹部１３を内部に有する中空状に形成される。   Specifically, the contact body 11 of the present example includes an inner peripheral wall piece 16 on the inner side in the tire radial direction that forms a contact portion 16E that can be contacted with the sidewall surface TSs, and a tip portion that contacts the sidewall surface TSs. In the present example, the outer peripheral wall piece 17 on the outer side in the tire radial direction that forms the contact portion 17E that can contact, and the joint wall piece 18 that connects between the inner peripheral wall piece 16 and the respective rear end portions of the outer peripheral wall piece 17 are substantially omitted in cross section. A U-shaped cylindrical base body 19 is provided. The cylindrical base body 19 is formed in a hollow shape having an annular recess 13 surrounded by the inner peripheral wall piece 16, the outer peripheral wall piece 17, and the joint wall piece 18 and opening toward the sidewall surface TSs.

本例では、前記内周壁片１６は、前記当接部１６Ｅからタイヤ軸方向にのびる大径の第１の壁片部１６ａと、この第１の壁片部１６ａに段差部１６ｂを介して連なる小径な第２の壁片部１６ｃとを具える。これにより前記内周壁片１６は、リム体５との衝合を回避しながら前記環状凹部１３の容積、即ち密閉空間Ｊの容積の増大を図っている。なお前記当接部１６Ｅ、１７Ｅは、少なくともタイヤ最大幅位置Ｐｍのタイヤ半径方向両側でサイドウォール面ＴＳｓと当接するが、好ましくは、当接部１６Ｅ、１７Ｅ間の半径方向距離Ｌ１を、タイヤ内腔ＨのビードベースラインＢＬからの半径方向高さＬｈ（タイヤ内腔高さＬｈという場合がある。）の３０％以上として、より広範囲を冷却するのが好ましい。   In this example, the inner peripheral wall piece 16 is connected to the first wall piece portion 16a having a large diameter extending in the tire axial direction from the contact portion 16E, and the first wall piece portion 16a via a step portion 16b. A small-diameter second wall piece 16c. As a result, the inner peripheral wall piece 16 attempts to increase the volume of the annular recess 13, that is, the volume of the sealed space J, while avoiding a collision with the rim body 5. The contact portions 16E and 17E are in contact with the sidewall surface TSs at least on both sides in the tire radial direction of the tire maximum width position Pm. Preferably, the radial distance L1 between the contact portions 16E and 17E It is preferable to cool a wider area as 30% or more of the radial height Lh from the bead base line BL of the cavity H (sometimes referred to as tire lumen height Lh).

又当接体１１は、前記当接部１６Ｅ、１７Ｅの少なくとも一方に、弾性変形しうるクッション体２０を設けている。これにより当接時、前記当接部１６Ｅ、１７Ｅとサイドウォール面ＴＳｓとの間に大きな隙間が生じて冷却水が漏れるのを抑制しうる。又前記クッション体２０は、当接時にサイドウォール面ＴＳｓに傷か発生するのを防止するのにも役立つ。そのために前記クッション体２０は、傷が目立ちやすいトレッド部ＴＴ側の当接部１７Ｅに設けるのが好ましい。このクッション体２０として、ゴムや合成樹脂を発泡させた弾性圧縮変形容易な種々のスポンジ材を用いることができる。   The contact body 11 is provided with a cushion body 20 that can be elastically deformed in at least one of the contact portions 16E and 17E. Thereby, at the time of contact, it is possible to suppress leakage of cooling water due to a large gap between the contact portions 16E and 17E and the sidewall surface TSs. Further, the cushion body 20 is useful for preventing the side wall surface TSs from being scratched at the time of contact. Therefore, it is preferable that the cushion body 20 is provided in the contact portion 17E on the tread portion TT side where scratches are easily noticeable. As the cushion body 20, various sponge materials easily foamed and elastically deformed by foaming rubber or synthetic resin can be used.

又前記当接体１１には、前記密閉空間Ｊに冷却水を注入する注入口１４と、注入された冷却水を密閉空間Ｊから排出する排出口１５とが形成される。本例では、上の当接体１１Ａには、第１の壁片部１６ａに排出口１５が設けられ、又第２の壁片部１６ｃに注入口１４が設けられ、下の当接体１１Ｂには、第２の壁片部１６ｃに排出口１５が設けられ、又第１の壁片部１６ａに注入口１４が設けられる。即ち、排出口１５を密閉空間Ｊにおける下方側に設けるため、冷却後の冷却水を密閉空間Ｊから装置外に排出することができる。なお前記注入口１４には、電磁弁などの開閉弁を介して例えば給水ポンプなどの冷却水供給源が接続され、又前記排出口１５には、電磁弁などの開閉弁を介して排水口或いは排水ポンプ等に接続される。なお冷却水としては水道水、工業用水等が好適に採用でき、又冷却水の温度も、特に冷却処理を施すことなく、常温度のものが好適に採用しうる。   The contact body 11 is formed with an inlet 14 for injecting cooling water into the sealed space J and an outlet 15 for discharging the injected cooling water from the sealed space J. In this example, the upper contact body 11A is provided with a discharge port 15 in the first wall piece portion 16a, and an injection port 14 in the second wall piece portion 16c, and the lower contact body 11B. The second wall piece 16c is provided with a discharge port 15, and the first wall piece 16a is provided with an injection port 14. That is, since the discharge port 15 is provided on the lower side in the sealed space J, the cooled cooling water can be discharged from the sealed space J to the outside of the apparatus. The inlet 14 is connected to a cooling water supply source such as a water supply pump via an on-off valve such as an electromagnetic valve, and the discharge port 15 is connected to a drain port or an outlet via an on-off valve such as an electromagnetic valve. Connected to a drainage pump. In addition, tap water, industrial water, etc. can be employ | adopted suitably as cooling water, and the thing of normal temperature can also be employ | adopted suitably also about the temperature of cooling water, without performing a cooling process.

次に、前記移動手段１２は、各前記当接体１１をサイドウォール面ＴＳｓに対して接離可能にタイヤ軸心方向内外に相対移動させる。本例の移動手段１２は、前記上の取付け台８Ａに固定のシリンダ２１Ａと、下の取付け台８Ｂに固定のシリンダ２１Ｂとを具え、前記シリンダ２１Ａのロッド下端に、取付け板２２Ａを介して上の当接体１１Ａを昇降自在に取り付けるとともに、前記シリンダ２１Ｂのロッド上端に取付け板２２Ｂを介して下の当接体１１Ｂを昇降自在に取り付けている。   Next, the moving means 12 relatively moves each contact body 11 in and out of the tire axial direction so as to be able to contact and separate from the sidewall surface TSs. The moving means 12 of this example comprises a cylinder 21A fixed to the upper mounting base 8A and a cylinder 21B fixed to the lower mounting base 8B, and is attached to the lower end of the rod of the cylinder 21A via a mounting plate 22A. The lower abutting body 11B is attached to the upper end of the rod of the cylinder 21B via an attachment plate 22B.

従って移動手段１２は、インフレート状態の空気入りタイヤＴに対して、上のシリンダ２１Ａのロッドを伸張することで、上の当接体１１Ａを下降させてサイドウォール面ＴＳｓに当接でき、前記環状凹部１３とサイドウォール面ＴＳｓとの間で密閉空間Ｊを形成しうる。又下のシリンダ２１Ｂのロッドを伸張することで、下の当接体１１Ｂを上昇させてサイドウォール面ＴＳｓに当接でき、前記環状凹部１３とサイドウォール面ＴＳｓとの間で密閉空間Ｊを形成しうる。   Accordingly, the moving means 12 can extend the rod of the upper cylinder 21A with respect to the inflated pneumatic tire T, thereby lowering the upper contact body 11A and contacting the sidewall surface TSs. A sealed space J can be formed between the annular recess 13 and the sidewall surface TSs. Further, by extending the rod of the lower cylinder 21B, the lower contact body 11B can be lifted to contact the sidewall surface TSs, and a sealed space J is formed between the annular recess 13 and the sidewall surface TSs. Yes.

このように、本実施形態のポストキュアインフレート装置１は、インフレート状態で保持された加硫直後の空気入りタイヤＴの上下のサイドウォール部ＴＳを、それぞれ冷却水を用いて冷却することができる。前記サイドウォール部ＴＳは、コード収縮によって最もタイヤ変形が生じやすい部位であるため、この部位をインフレート状態で冷却水を用いて強制冷却することにより、コード収縮を抑えてタイヤ変形を効果的にかつ確実に抑制でき、ＰＣＩ工程時間の大幅な短縮を図ることが可能となる。   As described above, the post-cure inflating device 1 of the present embodiment can cool the upper and lower sidewall portions TS of the pneumatic tire T immediately after vulcanization held in an inflated state using cooling water. it can. Since the sidewall TS is a portion where the tire deformation is most likely to occur due to the cord contraction, the tire is effectively deformed by suppressing the cord contraction by forcibly cooling the portion with the cooling water in an inflated state. In addition, it can be surely suppressed and the PCI process time can be greatly shortened.

又前記サイドウォール部ＴＳは、ゴム厚さが小であるため加硫の進行が早く、過加硫になりやすい部位である。従って、このサイドウォール部ＴＳのみを集中的に冷却し、加硫の進行が遅いトレッド部ＴＴ及びビード部ＴＢにおいては冷却しないことにより、このトレッド部ＴＴ及びビード部ＴＢではＰＣＩ工程中に加硫を進行させることができ、加硫度を均一化させ、タイヤ品質を向上させるという効果も奏することもできる。なおトレッド部ＴＴ及びビード部ＴＢは、ゴム厚さが大でありカーカスコードがこのゴムに拘束されて収縮し難くい。そのため、ＰＣＩ工程を終了させた時点で、トレッド部ＴＴ及びビード部ＴＢの温度が、有機繊維コードの収縮が収まる温度（通常１００℃）以上であった場合にも、サイドウォール部ＴＳの温度が前記温度以下となれば、ＰＣＩ効果を得ることができる。   Further, the sidewall portion TS is a portion where the rubber thickness is small, so that the vulcanization progresses quickly and is easily overvulcanized. Therefore, only the sidewall portion TS is intensively cooled, and the tread portion TT and the bead portion TB, which are slow in vulcanization, are not cooled, so that the tread portion TT and the bead portion TB are vulcanized during the PCI process. It is also possible to make the vulcanization progress, uniforming the degree of vulcanization, and improving the tire quality. The tread portion TT and the bead portion TB have a large rubber thickness, and the carcass cord is restrained by the rubber and is not easily contracted. Therefore, when the temperature of the tread portion TT and the bead portion TB is equal to or higher than the temperature at which the organic fiber cord contracts (usually 100 ° C.) when the PCI process is finished, the temperature of the sidewall portion TS is If it becomes below the said temperature, the PCI effect can be acquired.

なお前記当接体１１は、前記環状凹部１３を断面略コ字状に形成する以外に断面略Ｕ字状、Ｖ字状など種々な断面形状に形成することができる。又当接体１１の移動手段１２、およびリム体５の昇降具６なども、種々な構造のものが採用しうる。   The abutment body 11 can be formed in various cross-sectional shapes such as a substantially U-shaped cross-section and a V-shaped cross-section in addition to forming the annular recess 13 in a substantially U-shaped cross-section. Also, the moving means 12 of the contact body 11 and the lifting tool 6 of the rim body 5 can be of various structures.

以上、本発明の特に好ましい実施形態について詳述したが、本発明は図示の実施形態に限定されることなく、種々の態様に変形して実施しうる。   As mentioned above, although especially preferable embodiment of this invention was explained in full detail, this invention is not limited to embodiment of illustration, It can deform | transform and implement in a various aspect.

本発明の効果を確認するため、図１の構造をなすポストキュアインフレート装置１を試作し、空気入りタイヤＴ（タイヤサイズ１９５／６５Ｒ１５の夏タイヤ）のサイドウォール部ＴＳを、冷却水を用いて強制冷却させた時のサイドウォール部ＴＳのタイヤ内腔側での温度変化を、時間経過とともに測定した。又比較例として、自然冷却させたタイヤのサイドウォール部ＴＳのタイヤ内腔側での温度変化を時間経過とともに測定し、その結果を図４に示す。   In order to confirm the effect of the present invention, a post-cure inflation device 1 having the structure shown in FIG. 1 was prototyped, and the sidewall portion TS of a pneumatic tire T (summer tire of tire size 195 / 65R15) was used with cooling water. Then, the temperature change on the tire lumen side of the sidewall portion TS when forcedly cooled was measured over time. As a comparative example, the temperature change on the tire lumen side of the sidewall portion TS of the naturally cooled tire was measured over time, and the result is shown in FIG.

なお冷却水の温度は、常温（１５℃）であり、当接部１６Ｅ、１７Ｅ間の半径方向距離Ｌ１はタイヤ内腔高さＬｈの７０％であった。   The temperature of the cooling water was normal temperature (15 ° C.), and the radial distance L1 between the contact portions 16E and 17E was 70% of the tire lumen height Lh.

図４に示すように、自然冷却させた比較例の場合、加硫金型から空気入りタイヤを取り出した時点から、有機繊維コードの収縮が収まる１００℃の温度Ｔ０までの冷却時間が１２．０分であったのに対し、実施例の場合には、加硫金型から空気入りタイヤを取り出した時点から、有機繊維コードの収縮が収まる１００℃の温度Ｔ０までの冷却時間を６．５分まで短縮しうるのが確認できる。   As shown in FIG. 4, in the case of the comparative example naturally cooled, the cooling time from the time when the pneumatic tire is taken out of the vulcanization mold to the temperature T0 of 100 ° C. where the shrinkage of the organic fiber cord is settled is 12.0. On the other hand, in the case of the example, the cooling time from the time when the pneumatic tire was taken out from the vulcanization mold to the temperature T0 of 100 ° C. at which the shrinkage of the organic fiber cord was settled was 6.5 minutes. It can be confirmed that it can be shortened.

又ゴムは、約１００℃の温度まで加硫が進行する。従って、実施例の場合、斜線部Ｋの分だけサイドウォール部の加硫進行を抑制でき、タイヤ全体としての加硫度を均一化してタイヤ品質を向上させることができる。   The rubber is vulcanized to a temperature of about 100 ° C. Therefore, in the case of the embodiment, the progress of vulcanization of the sidewall portion can be suppressed by the hatched portion K, and the tire quality can be improved by uniformizing the degree of vulcanization of the entire tire.

１ ポストキュアインフレート装置
２ タイヤ保持手段
３ 冷却手段
１１ 当接体
１２ 移動手段
１３ 環状凹部
１４ 注入口
１５ 排出口
２０ クッション体
Ｊ 密閉空間
Ｔ 空気入りタイヤ
ＴＳ サイドウォール部 DESCRIPTION OF SYMBOLS 1 Post cure inflation apparatus 2 Tire holding means 3 Cooling means 11 Contact body 12 Moving means 13 Annular recessed part 14 Inlet 15 Outlet 20 Cushion body J Sealed space T Pneumatic tire TS Side wall part

Claims (1)

加硫直後の空気入りタイヤを冷却するポストキュアインフレート装置であって、
加硫直後の空気入りタイヤをインフレート状態で保持するタイヤ保持手段と、
インフレート状態で保持された前記空気入りタイヤの上下のサイドウォール部を、それぞれ冷却水を用いて冷却する冷却手段とを具えるとともに、
前記冷却手段は、
前記サイドウォール部の外表面に対して接離可能にタイヤ軸心方向内外に相対移動しうる中空円筒状をなし、しかもサイドウォール部の外表面に当接することにより該サイドウォールの外表面との間でタイヤ周方向に連続してのびる環状の密閉空間を形成しうる環状凹部と、前記密閉空間に冷却水を注入する注入口と、注入された冷却水を密閉空間から排出する排出口とを有する上下一対の当接体、
及び各前記当接体を、前記サイドウォール部の外表面に対して接離可能にタイヤ軸心方向内外に相対移動させる移動手段を具え、
前記当接体は、前記サイドウォール部の外表面と当接する当接部に、弾性変形しうるクッション体を具えることを特徴とするポストキュアインフレート装置。
A post-cure inflation device for cooling a pneumatic tire immediately after vulcanization,
Tire holding means for holding the pneumatic tire immediately after vulcanization in an inflated state;
With cooling means for cooling the upper and lower sidewall portions of the pneumatic tire held in an inflated state using cooling water, respectively,
The cooling means is
A hollow cylindrical shape that can move in and out of the tire axial center direction so as to be able to contact and separate from the outer surface of the sidewall portion, and is in contact with the outer surface of the sidewall portion by contacting the outer surface of the sidewall portion. An annular recess capable of forming an annular sealed space extending continuously in the tire circumferential direction, an inlet for injecting cooling water into the sealed space, and an outlet for discharging the injected cooling water from the sealed space A pair of upper and lower contact bodies,
And each said abutment body, separable therefrom example immediately moving means for relatively moving the tire axial direction and out to the outer surface of the side wall portion,
The post-cure inflating device according to claim 1, wherein the abutting body includes a cushion body that can be elastically deformed at an abutting portion that abuts on an outer surface of the sidewall portion .
JP2011084760A 2011-04-06 2011-04-06 Post cure inflation device Expired - Fee Related JP5753427B2 (en)

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US3065499A (en) * 1958-05-02 1962-11-27 Nat Rubber Machinery Co Tire carcass holder and curing press
JPH01310914A (en) * 1988-06-09 1989-12-15 Bridgestone Corp Postcure inflator
JPH0222016A (en) * 1988-07-12 1990-01-24 Bridgestone Corp Postcuring inflator
JP3983378B2 (en) * 1998-05-18 2007-09-26 株式会社神戸製鋼所 Tire vulcanizing method and tire vulcanizing machine
JP2000280264A (en) * 1999-01-27 2000-10-10 Bridgestone Corp Method for correcting uniformity of tire and tire prepared by applying it
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