JP2010194824A - Pneumatic tire - Google Patents

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JP2010194824A
JP2010194824A JP2009041334A JP2009041334A JP2010194824A JP 2010194824 A JP2010194824 A JP 2010194824A JP 2009041334 A JP2009041334 A JP 2009041334A JP 2009041334 A JP2009041334 A JP 2009041334A JP 2010194824 A JP2010194824 A JP 2010194824A
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tire
mold
bladder
mold surface
tire cavity
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JP5275846B2 (en
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Joji Watanabe
城司 渡邊
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Bridgestone Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a tire vulcanization mold which allow sufficient thinning of the side-wall of a tire, eliminates bare in the side-wall and controls the flowing of a rubber in the bead toe and a method for manufacturing a tire using the mold. <P>SOLUTION: The tire vulcanization mold 10 includes bead rings 3 and 7 having the first mold surface 11 corresponding to the inside surface of a bead of a tire in the radial direction and the second mold surface 12 corresponding to a bladder 5. The second mold surface 12 is arranged so as to extend continuously toward the inside in the radial direction from the inside of the tire cavity in the axial direction in the first mold surface 11 when the mold is closed and has a straight-line 13 practically connected to the first mold surface 11 in the cross-section passing through the central axis of the tire cavity. The straight-line 13 is inclined so that the outside of the tire cavity in the radial direction becomes the outside in the axial direction while the inside of the tire cavity in the radial direction becomes the inside in the axial direction, and the inclination angle of the straight-line 13 to the straight line perpendicular to the central axis of the tire cavity is 10-20 degree. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

閉止した状態においてブラダーとの間に形成されるタイヤキャビティ内でタイヤを加硫するタイヤ加硫金型およびそれを用いたタイヤの製造方法に関する。   The present invention relates to a tire vulcanization mold for vulcanizing a tire in a tire cavity formed with a bladder in a closed state, and a method for manufacturing a tire using the same.

加硫金型は、従来から通常、図１に断面図で示すように、タイヤ外側面を形成するためのタイヤ加硫金型９０は、下サイドプレート２および下ビードリング９３よりなる下型９４と、上サイドプレートおよび上ビードリング９７よりなる上型９８と、トレッド型９とより構成されている。また、タイヤ内側面を形成するためのブラダー５が加硫金型９０の中に設けられ、ブラダー５は、その内側に内圧を充填することによりタイヤ状に膨出し、加硫金型９０との間にタイヤキャビティ１を形成する。   Conventionally, as shown in a cross-sectional view in FIG. 1, a vulcanization mold is conventionally a tire vulcanization mold 90 for forming a tire outer surface, a lower mold 94 including a lower side plate 2 and a lower bead ring 93. And an upper mold 98 composed of an upper side plate and an upper bead ring 97, and a tread mold 9. Further, a bladder 5 for forming the inner surface of the tire is provided in the vulcanizing mold 90, and the bladder 5 expands into a tire shape by filling the inner pressure with the inner pressure, and the bladder 5 is connected to the vulcanizing mold 90. A tire cavity 1 is formed between them.

上、下のビードリング９３、９７は、タイヤのビード部の半径方向内側面に対応する第１の金型面８１と、ブラダー５に対応する第２の金型面８２とを有する。このとき、第２の金型面８２は、加硫金型９０を閉止した状態においてブラダー５との間に形成されるタイヤキャビティ１の中心軸線（タイヤキャビティ軸線Ｃ）を通る断面において、一般的には、タイヤキャビティ軸線Ｃに直交する方向に延在する直線部で第１の金型面８１に実質的に連続するように構成されているが、この直線部が、タイヤキャビティ軸線Ｃに直交する方向に対して、タイヤキャビティ半径方向外側が軸方向外側に大きく傾斜したもの（例えば特許文献１参照。）や、タイヤキャビティ半径方向外側が軸方向内側に傾斜したもの（例えば特許文献２参照。）なども提案されている。   The upper and lower bead rings 93 and 97 have a first mold surface 81 corresponding to the radially inner side surface of the bead portion of the tire and a second mold surface 82 corresponding to the bladder 5. At this time, the second mold surface 82 is generally in a cross section passing through the central axis (tire cavity axis C) of the tire cavity 1 formed between the bladder 5 and the vulcanization mold 90 in a closed state. Is configured so as to be substantially continuous to the first mold surface 81 with a linear portion extending in a direction orthogonal to the tire cavity axis C. This linear portion is orthogonal to the tire cavity axis C. The tire cavity radial outer side is greatly inclined outward in the axial direction (see, for example, Patent Document 1) and the tire cavity radial outer side is inclined inward in the axial direction (see, for example, Patent Document 2). ) Etc. are also proposed.

特開２００６−３３４８８８号公報JP 2006-334888 A 特開平１０−１１９０５３号公報Japanese Patent Laid-Open No. 10-119053

しかしながら、いずれの従来技術においても、タイヤのサイドウォール部の肉厚を十分薄くするとともにサイドウォール部のベアをなくすこと、および、ビードトウがゴム流れによって肥大化しビードトウの欠け不良が発生するのを抑えることの両要件を同時に成立させることが難しかった。タイヤキャビティ軸線Ｃと直交する方向に対して、タイヤキャビティ半径方向外側が軸方向外側となるように傾斜する側を正として表した、タイヤキャビティ軸線Ｃと直交する方向に対する傾斜角度α（図２に、正の場合の傾斜角度αを示す）は、これが小さすぎると、サイドウォール部の肉厚が厚くなってしまい、一方、傾斜角度αが大きくなりすぎると、ビードトウでのゴム流れが大きくなりビードトウの欠け不良が発生しやすくなってしまうのである。   However, in any of the conventional techniques, the thickness of the sidewall portion of the tire is made sufficiently thin, the bare portion of the sidewall portion is eliminated, and the bead toe is enlarged due to the rubber flow and the occurrence of chipping failure of the bead toe is prevented. It was difficult to establish both requirements at the same time. An inclination angle α with respect to a direction orthogonal to the tire cavity axis C (in FIG. 2), with the side inclined so that the outer side in the radial direction of the tire cavity becomes the outer side in the axial direction with respect to the direction orthogonal to the tire cavity axis C. The inclination angle α in the case of positive) indicates that if this is too small, the thickness of the sidewall portion becomes thick. On the other hand, if the inclination angle α is too large, the rubber flow at the bead toe becomes large and the bead toe becomes large. It is easy for chipping defects to occur.

この理由は次の通りである。すなわち、ブラダー５を膨出させる際、もし傾斜角度αが小さい場合には、ブラダー５が膨出してタイヤ内面に押圧し始めるタイミングが、サイドウォール部内面の方がトレッド部内面よりあとになってしまい、トレッド部からサイドウォール部へゴムが流れることになり、これによってサイドウォール部の肉厚が厚くなるとともに、この流れそのものに起因するベアがサイドウォール部に発生してしまう。   The reason is as follows. That is, when the bladder 5 is bulged, if the inclination angle α is small, the timing at which the bladder 5 begins to bulge and press against the inner surface of the tire is after the inner surface of the sidewall portion after the inner surface of the tread portion. As a result, rubber flows from the tread portion to the sidewall portion, thereby increasing the thickness of the sidewall portion and generating a bear due to the flow itself in the sidewall portion.

一方、傾斜角度αが大きくなりすぎると、タイヤのビードトウ部内面に対するブラダーの押圧力が小さくなってしまい、ここにゴム流れが発生しやすくなる。   On the other hand, if the inclination angle α is too large, the pressing force of the bladder against the inner surface of the bead toe portion of the tire becomes small, and rubber flow tends to occur here.

本発明は、このような問題点に鑑みてなされたものであり、タイヤのサイドウォール部の肉厚を十分薄くするとともにサイドウォール部のベアをなくすこと、および、ビードトウでのゴム流れを抑えることの要件を両立させることのできるタイヤ加硫金型、および、これを用いたタイヤの製造方法を提供することを目的とする。   The present invention has been made in view of such problems, and it is possible to sufficiently reduce the thickness of the sidewall portion of the tire, eliminate the bare portion of the sidewall portion, and suppress the rubber flow at the bead toe. An object of the present invention is to provide a tire vulcanization mold capable of satisfying both requirements and a method for manufacturing a tire using the same.

本発明は、閉止した状態においてブラダーとの間に形成されるタイヤキャビティ内でタイヤを加硫するタイヤ加硫金型において、
タイヤのビード部の半径方向内側面に対応する第１の金型面と、ブラダーに対応する第２の金型面とを有するビードリングを具え、第２の金型面は、第１の金型面のタイヤキャビティ軸方向内側から連続して半径方向外側に向かうよう設けられるとともににタイヤキャビティ中心軸を通る断面において、第１の金型面に実質的に連続する直線部を有し、この直線部は、タイヤキャビティ半径方向外側が軸方向外側に、タイヤキャビティ半径方向内側が軸方向内側になるよう傾斜し、この直線部のタイヤキャビティ中心軸と直交する直線に対する傾斜角度は、10〜20度であることを特徴とするタイヤ加硫金型である。 The present invention provides a tire vulcanization mold for vulcanizing a tire in a tire cavity formed between a bladder in a closed state,
A bead ring having a first mold surface corresponding to a radially inner side surface of a bead portion of a tire and a second mold surface corresponding to a bladder is provided, and the second mold surface is a first mold surface. The mold surface is provided so as to continuously extend radially inward from the tire cavity axial direction inner side, and has a linear portion substantially continuous with the first mold surface in a cross section passing through the tire cavity central axis. The straight portion is inclined so that the outer side in the tire cavity radial direction is the outer side in the axial direction and the inner side in the radial direction of the tire cavity is the inner side in the axial direction, and the inclination angle with respect to the straight line orthogonal to the tire cavity central axis is 10-20. It is a tire vulcanization mold characterized by having a degree.

また、本発明は、ブラダーとの間に生タイヤを収容して加硫金型を閉止したあとブラダーを膨出させてタイヤの断面形状を形成してタイヤを加硫する際に、前記タイヤ加硫金型を用いるタイヤの製造方法である。   In addition, the present invention provides a tire tire vulcanization when a tire is accommodated between the bladder and the vulcanizing mold is closed, and then the bladder is bulged to form a cross-sectional shape of the tire and vulcanize the tire. A tire manufacturing method using a metal mold.

本発明によれば、前記直線部のタイヤキャビティ中心軸と直交する直線に対する傾斜角度を、10〜20度としたことにより、タイヤのサイドウォール部の肉厚を十分薄くするとともにサイドウォール部のベアをなくすこと、および、ビードトウでのゴム流れを抑えることの要件を両立させることができ、この傾斜角度を10度未満とした場合には、ブラダーの膨出に際してこれをタイヤキャビティ軸方向に広げることが難しくなり、サイドウォール部の肉厚が厚くなってしまい、一方、この傾斜角度を、20度を超えるものとした場合には、ビードトウのゴム流れが大きくなってしまう。   According to the present invention, the inclination angle of the straight portion with respect to the straight line orthogonal to the tire cavity central axis is 10 to 20 degrees, so that the thickness of the sidewall portion of the tire is sufficiently reduced and the bare portion of the sidewall portion is And to reduce the rubber flow at the bead toe, if this inclination angle is less than 10 degrees, it will be spread in the tire cavity axial direction when the bladder bulges. However, when the inclination angle exceeds 20 degrees, the rubber flow of the bead toe becomes large.

従来のタイヤ加硫金型を示す断面図である。It is sectional drawing which shows the conventional tire vulcanization metal mold | die. 正の場合の傾斜角度αを示す模式図である。It is a schematic diagram which shows inclination-angle (alpha) in the case of positive. 本発明に係る実施形態のタイヤ加硫金型を示す断面図である。It is sectional drawing which shows the tire vulcanization metal mold | die of embodiment which concerns on this invention.

図３は、本発明に係る実施形態のタイヤ加硫金型を示す断面図であり、タイヤ加硫金型１０は、下サイドプレート２と、下ビードリング３とよりなる下型４と、上サイドプレート６および上ビードリング７よりなる上型８と、トレッド型９とより構成されている。また、タイヤ内側面を形成するためのブラダー５が加硫金型１０の中に設けられ、ブラダー５は、その内側に内圧を充填することによりタイヤ状に膨出し、加硫金型１０との間にタイヤキャビティ１を形成する。   FIG. 3 is a cross-sectional view showing a tire vulcanization mold according to an embodiment of the present invention. The tire vulcanization mold 10 includes a lower mold 4 including a lower side plate 2 and a lower bead ring 3, and an upper mold. An upper mold 8 including a side plate 6 and an upper bead ring 7 and a tread mold 9 are configured. Further, a bladder 5 for forming the inner surface of the tire is provided in the vulcanization mold 10, and the bladder 5 bulges into a tire shape by filling the inner pressure inside thereof, and is connected to the vulcanization mold 10. A tire cavity 1 is formed between them.

図３において、符号１は、閉止した状態の加硫金型１０とブラダー５との間に形成されるタイヤキャビティを表し、Ｃはその中心軸線、タイヤキャビティ軸線を表す。   In FIG. 3, reference numeral 1 represents a tire cavity formed between the vulcanization mold 10 and the bladder 5 in a closed state, and C represents a center axis thereof and a tire cavity axis.

上下のビードリング３、７は、タイヤのビード部の半径方向内側面に対応する第１の金型面１１と、ブラダー５に対応する第２の金型面１２とを有し、第２の金型面１２は、金型閉止状態において、第１の金型面１１のタイヤキャビティ軸方向内側から連続して半径方向外側に向かうよう設けられていて、タイヤ加硫金型１０は、その特徴として、第２の金型面１２が、第１の金型面１１に実質的に連続する直線部１３を有し、この直線部１３は、タイヤキャビティ半径方向外側が軸方向外側に、タイヤキャビティ半径方向内側が軸方向内側になるよう傾斜し、この直線部１３のタイヤキャビティ中心軸と直交する直線に対する傾斜角度αは、10〜20度となるよう構成されている（図２参照）。   The upper and lower bead rings 3, 7 have a first mold surface 11 corresponding to the radially inner side surface of the bead portion of the tire and a second mold surface 12 corresponding to the bladder 5, The mold surface 12 is provided continuously from the inner side in the tire cavity axial direction of the first mold surface 11 toward the outer side in the radial direction when the mold is closed. The second mold surface 12 has a straight portion 13 substantially continuous to the first mold surface 11, and the straight portion 13 has a tire cavity radial outer side in the axial direction and a tire cavity The inner side in the radial direction is inclined so as to be inward in the axial direction, and an inclination angle α with respect to a straight line orthogonal to the tire cavity central axis of the straight line portion 13 is configured to be 10 to 20 degrees (see FIG. 2).

このようなタイヤ加硫金型１０を用いてタイヤを加硫するには、円筒状に収縮したブラダー５の周りの、下型４の上に生タイヤを配置したあと、上型８を下降させつつ、トレッド型９を半径方向中心に向かって移動させてタイヤ加硫金型１０を閉止し、一方、ブラダー５もこれを膨出させてタイヤの加硫を開始する。   In order to vulcanize a tire using such a tire vulcanizing mold 10, a raw tire is disposed on the lower mold 4 around the bladder 5 contracted into a cylindrical shape, and then the upper mold 8 is lowered. Meanwhile, the tread mold 9 is moved toward the center in the radial direction to close the tire vulcanizing mold 10, while the bladder 5 is also expanded to start vulcanizing the tire.

本発明は上記の構成によって、先に説明したように、タイヤのサイドウォール部の肉厚を十分薄くするとともにサイドウォール部のベアをなくすこと、および、ビードトウでのゴム流れを抑えることの要件を両立させることができ、この傾斜角度αを10度未満とした場合には、ブラダー５の膨出に際してこれをタイヤキャビティ軸方向に広げることが難しくなり、サイドウォール部の肉厚が厚くなってしまい、一方、この傾斜角度αを、20度を超えるものとした場合には、ビードトウのゴム流れが大きくなってしまう。   As described above, the present invention has the requirements for sufficiently reducing the thickness of the sidewall portion of the tire, eliminating the bare portion of the sidewall portion, and suppressing the rubber flow in the bead toe as described above. If the inclination angle α is less than 10 degrees, it is difficult to spread the bladder 5 in the tire cavity axial direction when the bladder 5 bulges, and the wall thickness of the sidewall portion increases. On the other hand, when the inclination angle α exceeds 20 degrees, the rubber flow of the bead toe becomes large.

ここで、直線部１３は、第１の金型面１１に実質的に連続しているが、「実質的」とは、設計上、製造上必要な曲線部を介して連続しているものも含むものとする。   Here, the straight line portion 13 is substantially continuous with the first mold surface 11, but “substantially” means that the straight portion 13 is continuous through a curved portion necessary for design and manufacture. Shall be included.

上下のビードリング３、７の第２の金型面１２の傾斜角度αが互いに異なる6種類のタイヤ加硫金型を用いて、各種類に対してそれぞれ20本、合計120本のタイヤを加硫し、それぞれのタイヤのサイドウォール部の肉厚を測定するとともに、サイドウォール部ベアの発生率、および、ビードトウ欠け不良の発生率のデータをとった。結果を表１に示す。
加硫に用いたタイヤのサイズは、225/45R17であった。また、サイドウォール部ベアの発生率、および、ビードトウ欠け不良の発生率は、試作した各20本のタイヤについての発生率を示す。 Using six types of tire vulcanization molds with different inclination angles α of the second mold surfaces 12 of the upper and lower bead rings 3 and 7, 20 tires were added for each type, for a total of 120 tires. The thickness of the sidewall portion of each tire was measured, and data on the incidence rate of the sidewall portion bear and the occurrence rate of bead toe chipping failure were taken. The results are shown in Table 1.
The tire size used for vulcanization was 225 / 45R17. Further, the incidence rate of the sidewall portion bear and the occurrence rate of the bead toe chipping failure indicate the occurrence rates for each of 20 prototype tires.

また、傾斜角度αは、図２を参照して先に説明したように、タイヤキャビティ軸線Ｃと直交する方向に対して、タイヤキャビティ半径方向外側が軸方向外側となるように傾斜する側を正としている。   In addition, as described above with reference to FIG. 2, the inclination angle α is set so that the side inclined in such a manner that the outer side in the tire cavity radial direction becomes the outer side in the axial direction with respect to the direction orthogonal to the tire cavity axial line C. It is said.

Figure 2010194824
Figure 2010194824

表１から明らかなように、傾斜角度αが10°未満である場合には、サイドウォール部の肉厚が厚くなるとともにサイドウォール部ベアが発生しやすくなり、一方、これが20°を超えた場合には、ビードトウ欠け不良が発生しやすくなる。実施例のものは、これらの点において仕様を満足するものであった。   As is clear from Table 1, when the inclination angle α is less than 10 °, the thickness of the sidewall portion increases and the sidewall portion bears easily, whereas when it exceeds 20 ° In such a case, a bead toe defect is likely to occur. The examples satisfy the specifications in these respects.

１ タイヤキャビティ
２ 下サイドプレート
３ 下ビードリング
４ 下型
５ ブラダー
６ 上サイドプレート
７ 上ビードリング
８ 上型
９ トレッド型
１０ タイヤ加硫金型
１１ 第１の金型面
１２ 第２の金型面
１３ 直線部
Ｃ キャビティ軸線 DESCRIPTION OF SYMBOLS 1 Tire cavity 2 Lower side plate 3 Lower bead ring 4 Lower mold 5 Bladder 6 Upper side plate 7 Upper bead ring 8 Upper mold 9 Tread mold 10 Tire vulcanization mold 11 1st mold surface 12 2nd mold surface 13 Straight part C Cavity axis

Claims (2)

閉止した状態においてブラダーとの間に形成されるタイヤキャビティ内でタイヤを加硫するタイヤ加硫金型において、
タイヤのビード部の半径方向内側面に対応する第１の金型面と、ブラダーに対応する第２の金型面とを有するビードリングを具え、第２の金型面は、第１の金型面のタイヤキャビティ軸方向内側から連続して半径方向外側に向かうよう設けられるとともににタイヤキャビティ中心軸を通る断面において、第１の金型面に実質的に連続する直線部を有し、この直線部は、タイヤキャビティ半径方向外側が軸方向外側に、タイヤキャビティ半径方向内側が軸方向内側になるよう傾斜し、この直線部のタイヤキャビティ中心軸と直交する直線に対する傾斜角度は、10〜20度であることを特徴とするタイヤ加硫金型。 In a tire vulcanization mold for vulcanizing a tire in a tire cavity formed between the bladder in a closed state,
A bead ring having a first mold surface corresponding to a radially inner side surface of a bead portion of a tire and a second mold surface corresponding to a bladder is provided, and the second mold surface is a first mold surface. The mold surface is provided so as to continuously extend radially inward from the tire cavity axial direction inner side, and has a linear portion substantially continuous with the first mold surface in a cross section passing through the tire cavity central axis. The straight portion is inclined so that the outer side in the tire cavity radial direction is the outer side in the axial direction and the inner side in the radial direction of the tire cavity is the inner side in the axial direction, and the inclination angle with respect to the straight line orthogonal to the tire cavity central axis is 10-20. Tire vulcanization mold characterized by the degree. ブラダーとの間に生タイヤを収容して加硫金型を閉止したあとブラダーを膨出させてタイヤの断面形状を形成してタイヤを加硫する際に、この加硫金型として、請求項１に記載のタイヤ加硫金型を用いるタイヤの製造方法。   The vulcanization mold is used when the tire is vulcanized by accommodating the raw tire between the bladder and closing the vulcanization mold and then expanding the bladder to form a cross-sectional shape of the tire. A method for manufacturing a tire using the tire vulcanization mold according to 1.
JP2009041334A 2009-02-24 2009-02-24 Pneumatic tire Expired - Fee Related JP5275846B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016150540A (en) * 2015-02-18 2016-08-22 住友ゴム工業株式会社 Bead ring

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JPS61183614U (en) * 1985-05-09 1986-11-15
JPH10119053A (en) * 1996-10-16 1998-05-12 Yokohama Rubber Co Ltd:The Forming mold for pneumatic tire
JPH10235648A (en) * 1997-02-26 1998-09-08 Bridgestone Corp Tire mold and tire vulcanizing method using the same
JP2005186493A (en) * 2003-12-26 2005-07-14 Sumitomo Rubber Ind Ltd Mold for tire and method for producing tire
JP2006334888A (en) * 2005-06-01 2006-12-14 Sumitomo Rubber Ind Ltd Tire mold and tire manufacturing method

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JPS61183614U (en) * 1985-05-09 1986-11-15
JPH10119053A (en) * 1996-10-16 1998-05-12 Yokohama Rubber Co Ltd:The Forming mold for pneumatic tire
JPH10235648A (en) * 1997-02-26 1998-09-08 Bridgestone Corp Tire mold and tire vulcanizing method using the same
JP2005186493A (en) * 2003-12-26 2005-07-14 Sumitomo Rubber Ind Ltd Mold for tire and method for producing tire
JP2006334888A (en) * 2005-06-01 2006-12-14 Sumitomo Rubber Ind Ltd Tire mold and tire manufacturing method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016150540A (en) * 2015-02-18 2016-08-22 住友ゴム工業株式会社 Bead ring

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