JP2008149609A - Manufacturing method of air pouch for safety tire - Google Patents

Manufacturing method of air pouch for safety tire Download PDF

Info

Publication number
JP2008149609A
JP2008149609A JP2006341361A JP2006341361A JP2008149609A JP 2008149609 A JP2008149609 A JP 2008149609A JP 2006341361 A JP2006341361 A JP 2006341361A JP 2006341361 A JP2006341361 A JP 2006341361A JP 2008149609 A JP2008149609 A JP 2008149609A
Authority
JP
Japan
Prior art keywords
rubber sheet
unvulcanized rubber
tire
overlap
joint
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
JP2006341361A
Other languages
Japanese (ja)
Inventor
Tateo Nagahara
健郎 長原
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bridgestone Corp
Original Assignee
Bridgestone Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bridgestone Corp filed Critical Bridgestone Corp
Priority to JP2006341361A priority Critical patent/JP2008149609A/en
Publication of JP2008149609A publication Critical patent/JP2008149609A/en
Withdrawn legal-status Critical Current

Links

Images

Landscapes

  • Tires In General (AREA)
  • Tyre Moulding (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To allow the side parts of an unvulcanized rubber sheet joined with overlap with each other or the like and sufficiently homogenize the entire annular air pouch as a finished product. <P>SOLUTION: This hollow annular air pouch is encased in the tire and filled with the air as an inner pressure, and behaves to deform by dilation following the lowering of the tire inner pressure, thus taking the role to support a load taking over the tire. The air pouch is manufactured by joining both end parts of the unvulcanized rubber sheet 1 into a barrel-like member 3, which is, in turn, joined together endlessly and vulcanized under inflation pressure. In this manufacturing, the tensile rigidity of the overlap joined part 4 of the side parts of the unvulcanized rubber sheet 1, is allowed to gradually lower toward the each of side edges of the overlap area of the unvulcanized rubber sheet. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

この発明は、タイヤのパンクその他によってタイヤ内圧が低下もしくは消失しても、所定の距離にわたって安全な走行を継続することができる安全タイヤに用いられ、タイヤ内圧の低下に伴って拡張変形して、荷重の支持をタイヤから肩代わりする、全体として円環形状をなす安全タイヤ用空気のうの製造方法に関するものである。   This invention is used for a safety tire that can continue safe running over a predetermined distance even if the tire internal pressure decreases or disappears due to tire puncture or the like, and expands and deforms as the tire internal pressure decreases, The present invention relates to a method for manufacturing an air bladder for a safety tire having an annular shape as a whole, which supports the load from the tire.

従来のこの種の空気のうとしては、たとえば、特許文献1および2等に開示されたものがあり、これらの特許文献に記載された、埋設補強部材を有するまたは有しないゴム製の空気のうはいずれも、それの赤道面に直交する子午線方向断面内にゴムの継目を有しないシームレス構造であって、空気のうの製造工程および工数が嵩むとともに、コストもまた高くなることから、最近は、所定の幅を有する未加硫ゴムシートのそれぞれの側部部分を相互にオーバラップ接合させて、所定の長さの筒状部材を構成するとともに、その筒状部材の両端をエンドレスに接合した後、それを、たとえば加熱加圧気体等をもってインフレート成形した状態で加硫することによって空気のうを製造することで、それの製造工程および工数を低減させるとともに、空気のうコストをもまた低減させることが提案されている。
国際公開第02/43975号パンフレット 国際公開第02/96678号パンフレット
Conventional air bladders of this type include those disclosed in, for example, Patent Documents 1 and 2, etc., and rubber air bags having or without embedded reinforcing members described in these Patent Documents. These are seamless structures that do not have a rubber seam in the meridional section perpendicular to the equator plane, and since the production process and man-hours for air bladder increase, the cost also increases. The respective side portions of the unvulcanized rubber sheet having a predetermined width are joined to each other to form a cylindrical member having a predetermined length, and both ends of the cylindrical member are bonded endlessly. After that, for example, by producing an air bag by vulcanization in a state where it is inflated with a heated and pressurized gas or the like, the manufacturing process and man-hours thereof are reduced, It has been proposed to also reduce the cost of air bladders.
International Publication No. 02/43975 Pamphlet International Publication No. 02/96678 Pamphlet

一般的には、タイヤ内で、タイヤ内圧よりも高圧の気体を充填される安全タイヤ用の空気のうは、タイヤ内圧の低下によって、円環状空気のうの内外圧力差が所定値を越えた場合に、それの拡張変形部分の変形によってタイヤの内面にそれの全体にわたってほぼ均等に密着して内圧を保持し、タイヤの撓み変形の増大を抑制しつつ、荷重の支持をタイヤから肩代わりすることで、タイヤのパンク時等における継続的な安全走行を実現することができる。   Generally, in a tire, a pneumatic tire for a safety tire that is filled with a gas higher than the tire internal pressure has a pressure difference between the inside and outside of the annular air bladder exceeding a predetermined value due to a decrease in the tire internal pressure. In some cases, the deformation of the expansion deformation portion of the tire causes the inner surface of the tire to be almost evenly adhered to the entire tire to maintain the internal pressure and suppress the increase in the deformation of the tire while supporting the load from the tire. Thus, continuous safe driving at the time of tire puncture or the like can be realized.

この一方で、空気のうが、それの偏った拡張変形等に起因してタイヤの内面に偏って接触したり、不均等に接触したりしたときは、タイヤおよび空気のうに十分な耐久性を発揮させることができず、これがため、所定の走行速度での、所定の距離にわたる安全走行を担保することが困難になるおそれがある。   On the other hand, if the air bladder is unevenly contacted with the inner surface of the tire due to its uneven expansion deformation, etc. As a result, it is difficult to ensure safe traveling over a predetermined distance at a predetermined traveling speed.

ところで、空気のうを、タイヤの内面に所期した通りに均等に密着させるためには、加硫成形を終えた円環形状の空気のうそれ自体を、円周方向、子午線方向等の各方向に十分均質なものとすることが必要になるところ、先の提案技術によれば、筒状部材をエンドレスに構成した後、それを加硫するに際してのインフレート成形によって、エンドレス筒状部材のチューブ径を所定の寸法まで拡径させるとともに、全体として所定の周長の円環形状に膨張変形させる場合に、未加硫ゴムシートのそれぞれの側部部分のオーバラップ接合部がその接合部の幅方向および長さ方向で、他の非オーバラップ部分に比し、約2倍の引張り剛性を有することに起因して、オーバラップ接合部に隣接する領域への応力の集中によってその隣接領域がとくに大きく伸長変形し、そこでの厚みの減少、破断等を生じるおそれが高くなり、それ故に、円環形状の製品空気のうそれ自体の、所要に応じた均質性を確保することが難しいという問題があった。   By the way, in order to evenly adhere the air bladder to the inner surface of the tire as expected, the annular air bladder itself that has been vulcanized and molded can be used in the circumferential direction, meridian direction, etc. Where it is necessary to be sufficiently uniform in the direction, according to the previously proposed technique, the endless cylindrical member is formed by inflation molding when the cylindrical member is configured endlessly and then vulcanized. When expanding the tube diameter to a predetermined dimension and expanding and deforming into an annular shape having a predetermined circumference as a whole, the overlap joints of the respective side portions of the unvulcanized rubber sheet are Due to the tensile stiffness in the width direction and the length direction, which is about twice that of other non-overlapping parts, the concentration of stress on the area adjacent to the overlap joint causes the adjacent area to Especially large Therefore, there is a high risk of causing a reduction in thickness, breakage, etc., and it is therefore difficult to ensure the homogeneity of the annular product air itself as required. there were.

この発明は、提案技術が抱えるような問題点を解決することを課題としてなされたものであり、それの目的とするところは、提案技術に固有の前記の利点はそのままに、未加硫ゴムシートのそれぞれの側部部分をオーバラップ接合等させてなお、製品としての円環状の空気のうをそれの全体にわたって十分均質なものとする、安全タイヤ用空気のうの製造方法を提供するにある。   The present invention has been made to solve the problems of the proposed technology, and the object of the present invention is to keep the above-mentioned advantages inherent in the proposed technology as it is, and to keep the unvulcanized rubber sheet. The present invention provides a method for manufacturing a safety tire air bladder, in which the annular air bladder as a product is sufficiently homogeneous throughout the product even if the respective side portions of the tire are overlap-joined. .

この発明の、安全タイヤ用の空気のうの一の製造方法は、タイヤに収納されて内圧を充填され、パンク等に起因するタイヤ内圧の低下に伴って拡張変形して、荷重の支持をタイヤから肩代わりする中空円環状の空気のうを、未加硫ゴムシートの両側部部分を接合して筒状部材とし、この筒状部材をエンドレスに接合した後、それをインフレート成形しながら加硫することにより製造するに当り、未加硫ゴムシートの側部部分の接合部の、それの幅方向および長さ方向の引張り剛性を、未加硫ゴムシート同士のオーバラップ域のそれぞれの側縁に向けて、または、そのオーバーラップ域をさらに覆う、それより広幅のカバーゴムのそれぞれの側縁に向けて、たとえばステップ状、直線状等の態様の下で、次第に低下させるにある。   A method for manufacturing a pneumatic tire for a safety tire according to the present invention includes: a tire that is housed in a tire and filled with an internal pressure; and is expanded and deformed as the tire internal pressure is reduced due to puncture or the like; The hollow annular air bladder that replaces the shoulder is joined to both sides of the unvulcanized rubber sheet to form a tubular member, and this tubular member is joined endlessly, and then vulcanized while inflating it. In manufacturing, the tensile rigidity in the width direction and the length direction of the joint portion of the side portion of the unvulcanized rubber sheet is set to the respective side edge of the overlap region between the unvulcanized rubber sheets. Or gradually toward the respective side edge of the wider cover rubber that further covers the overlap region, for example, in the form of a step, a straight line, or the like.

この場合、接合部の引張り剛性を、一枚の未加硫ゴムシートの剛性を1としたとき、接合部のいずれの部分においても、80%以上で200%未満とすることが好ましい。   In this case, it is preferable that the tensile rigidity of the joint is 80% or more and less than 200% in any part of the joint, where the rigidity of one unvulcanized rubber sheet is 1.

ここで、上記接合部の上述したような剛性は、未加硫ゴムシートの、相互にオーバラップされるそれぞれの側部部分に、三角状、台形状、方形状等の、所要の平面輪部形状の切欠きを形成すること、それぞれの側部部分に貫通孔、たとえばともに同一寸法、もしくは異種寸法の貫通孔を所定の密度、または任意密度で形成すること等によって実現することができる他、未加硫ゴムシートの、相互にオーバラップされるそれぞれの側部部分の少なくとも一方の厚みを、たとえば、オーバーラップ域の全体にわたって非オーバラップ部分のそれより薄い均一厚みとすること、または、それぞれの側部部分を、オーバラップ域の全体にわったって、もしくは、オーバラップ域の一部で、側縁に向けて次第に薄肉とすること等によっても実現することができる。   Here, the above-described rigidity of the joint portion is such that a required planar ring portion such as a triangular shape, a trapezoidal shape, a rectangular shape, etc. is formed on each side portion of the unvulcanized rubber sheet that overlaps each other. In addition to forming a notch in the shape, it can be realized by forming through holes in each side part, for example, through holes of the same size or different sizes with a predetermined density or arbitrary density, etc. The thickness of at least one of the side portions of the unvulcanized rubber sheet that overlap each other is, for example, a uniform thickness that is thinner than that of the non-overlapping portion throughout the overlap region, or This can be achieved by making the side part of the entire part of the overlap area thinner or gradually thinner toward the side edge of the overlap area. It can be.

ところで、筒状部材の接合部は、未加硫ゴムシートの側部部分をオーバラップ接合させることに加え、そのオーバラップ域を、それより広幅のカバーゴムで、いずれか一方の表面側から覆うことによっても構成することができ、この場合は、接合部の引張剛性を、そのカバーゴム単独で、または、未加硫ゴムシートとともに、それぞれの側縁に向けて次第に低下させることで、所要の剛性低下を実現する。
そしてここでもまた、上記の引張り剛性を、一枚の未加硫ゴムシートの剛性を1としたとき、接合部のいずれの部分においても80%以上で200%未満とすることが好ましい。
By the way, the joining portion of the tubular member covers the overlap area from one surface side with a cover rubber wider than that in addition to overlapping the side portion of the unvulcanized rubber sheet. In this case, the tensile rigidity of the joint is gradually reduced toward the side edges of the cover rubber alone or with the unvulcanized rubber sheet. Realizes reduced rigidity.
Also in this case, it is preferable that the tensile rigidity is 80% or more and less than 200% in any part of the joint, where the rigidity of one unvulcanized rubber sheet is 1.

この発明の、他の製造方法は、とくに未加硫ゴムシートのそれぞれの側部部分を、それらに設けた、所要の平面輪部形状の、好ましくは複数個の切欠き部で、相互に隙間なく嵌め合わせて接合させるにあり、これによれば、未加硫ゴムシートの側部部分接合部の引張り剛性は、接合部の幅方向の全体にわたって、一枚の未加硫ゴムシートの剛性とほぼ等しい一定値となる。   Another manufacturing method according to the present invention is that the respective side portions of the unvulcanized rubber sheet, in particular, are provided with a required flat ring shape, preferably a plurality of notches, with a gap between them. According to this, the tensile rigidity of the side part joint part of the unvulcanized rubber sheet is equal to the rigidity of one unvulcanized rubber sheet over the entire width direction of the joint part. The constant value is almost equal.

未加硫ゴムシートのそれぞれの側部部分を単純にオーバラップ接合させて筒状部材を構成したときは、そのオーバラップ接合部でのシート厚みが、非接合部のそれの二倍になり、エンドレス接合後のその筒状部材を加硫する場合のそれのインフレート成形に当っては、オーバラップ接合部の幅方向および長さ方向のそれぞれの引張り剛性もまた、非接合部のそれの二倍となるので、その接合部は、それらのいずれの方向にも伸長し難い状態にある。   When the cylindrical member is configured by simply overlapping each side portion of the unvulcanized rubber sheet, the sheet thickness at the overlap bonding portion is twice that of the non-bonding portion, When the tubular member after endless bonding is vulcanized, the tensile stiffness in the width direction and the length direction of the overlap joint is also different from that of the non-joint. Since it is doubled, the joint is difficult to extend in either direction.

この一方で、上記接合部に比して剛性がステップ状に半減する、一枚のゴムシートになる、オーバラップ接合部への隣接域にはインフレート成形によって応力の集中が生じ、その隣接域ではゴムシートが各方向にとくに大きく伸長変形されることになるため、そこでのゴムシートの破断、薄肉化等が余儀なくされることになり、この薄肉化等は、未加硫成形を終えた後の製品空気のうにもそのまま残留することになる。   On the other hand, compared to the above joint, the rigidity is reduced by half in a step shape, resulting in a single rubber sheet. In the adjacent area to the overlap joint, stress concentration occurs due to inflation molding, and the adjacent area. In this case, since the rubber sheet is particularly greatly deformed in each direction, the rubber sheet must be ruptured, thinned, etc., and this thinning is performed after the unvulcanized molding is finished. The product air will remain as it is.

従ってかかる空気のうを、安全タイヤに用いた場合には、空気のうの、タイヤ内での、所期した通りの均等拡張等を担保することが困難になる。   Therefore, when such an air bladder is used for a safety tire, it becomes difficult to ensure equal expansion or the like of the air bladder within the tire as expected.

しかるに、この発明の前者の方法では未加硫ゴムシートの側部部分の接合部の引張り剛性を、未加硫ゴムシート同士の、二枚のシート部分になるオーバラップ域のそれぞれの側部に向けておよび/またはそのオーバラップ域をさらに覆う、そのオーバラップ域より広幅のカバーゴムのそれぞれの側部に向けて次第に低下させて、接合部それ自体の、とくに、非接合部への隣接域の引張り剛性を、とも一定の厚みの二枚のゴムシートを単純にオーバラップ接合させた場合のそれに比してはるかに小さくするとともに、その引張り剛性を、一枚のゴムシートになる接合部隣接域のそれに十分に近接させることにより、エンドレス筒状部材の加硫に伴うそれのインフレート成形時の、剛性段差の発生、ひいてはそれに起因する応力の集中を抑制して、接合部の幅方向および、それの長さ方向の伸長変形量を、接合部なかでもそれの非接合部隣接域と、非接合部の、接合部隣接域との相互間で十分に近づけることができ、結果として、加硫成形後の製品空気のうを、極端な薄肉部のない、全体として十分均質なものとすることができる。   However, in the former method of the present invention, the tensile rigidity of the joint portion of the side portion of the unvulcanized rubber sheet is applied to each side portion of the overlap region that becomes the two sheet portions between the unvulcanized rubber sheets. Towards and / or further covering the overlap area, gradually decreasing towards the respective sides of the cover rubber wider than the overlap area, so that the joint itself, in particular the adjacent area to the non-joint area The tensile rigidity of the rubber sheet is much smaller than that when two rubber sheets of a certain thickness are simply overlap-bonded, and the tensile rigidity is adjacent to the joint that forms a single rubber sheet. By making the area sufficiently close to the area, it is possible to suppress the occurrence of a rigid step during the inflation molding associated with the vulcanization of the endless tubular member, and consequently the concentration of stress due to it. The amount of elongation deformation in the width direction of the joint and the length direction of the joint can be made sufficiently close to each other between the non-joint adjacent area of the joint and the non-joint adjacent area of the joint. As a result, the product air bladder after vulcanization molding can be made sufficiently homogeneous as a whole without an extremely thin portion.

なおここで、オーバラップ接合部の、円環状空気のうに対する延在位置は特に限定されないが、そのオーバラップ接合部には、空気のうとなってなお、引張り剛性の高い部分が存在することを考慮した場合には、オーバラップ接合部を、タイヤのパンク時等の空気のうの拡張変形にさ程影響を及ぼすことのない内周側位置、いいかえれば子午線断面内の最内側位置もしくはその近傍にあって、ホイールリムに常時接触する位置に延在させることが好ましい。   Here, the extending position of the overlap joint with respect to the annular air bladder is not particularly limited. However, the overlap joint has a portion having high tensile rigidity as an air bladder. When considered, the overlap joint is located on the inner peripheral side that does not significantly affect the expansion of the air bladder during puncture of the tire, in other words, the innermost position in the meridian cross section or its vicinity. In this case, it is preferable to extend to a position where the wheel rim is always in contact.

ところで、上述したようなオーバラップ接合部等における引張り剛性は、一枚の未加硫ゴムシートの剛性を1としたとき、それの80%以上で200%未満とすること、とりわけ90%〜120%とすることが、インフレート成形時の、エンドレス筒状部材の伸長変形の均等性を担保する上で好ましい。   By the way, when the rigidity of one unvulcanized rubber sheet is 1, the tensile rigidity at the overlap joint as described above is 80% or more and less than 200%, particularly 90% to 120%. It is preferable to ensure the uniformity of expansion and deformation of the endless tubular member during inflation molding.

すなわちそれが80%未満では、接合部分に、他の部分に比して、伸長量がとくに多くなる薄肉部が発生し易く、200%を越えると、剛性段差に起因する問題が依然として発生し易くなる。   That is, if it is less than 80%, a thin-walled portion with a particularly large amount of elongation is likely to occur in the joint portion as compared with other portions, and if it exceeds 200%, problems due to rigidity steps are still likely to occur. Become.

未加硫ゴムシートのオーバラップ接合部における、前述したような所要の剛性低下は、たとえば、未加硫ゴムシートのそれぞれの側部部分に、所要の平面形輪郭形状の切欠きを形成した状態または、所要の寸法の貫通孔を所要の密度で形成した状態で、それらの側部部分を相互にオーバラップ接合させる等により実現することができ、これによれば、一定厚みのゴムシートのオーバラップ接合部の引張り剛性を、ゴム体積の減少分に応じて低減させることができる。   The required decrease in rigidity as described above at the overlapped portion of the unvulcanized rubber sheet is, for example, a state in which a notch having a required planar contour shape is formed on each side portion of the unvulcanized rubber sheet. Alternatively, it can be realized by, for example, forming the through-holes with the required dimensions at the required density, and overlapping the side portions with each other. The tensile rigidity of the lap joint can be reduced according to the decrease in the rubber volume.

そしてこのことは、未加硫ゴムシートの、相互にオーバラップされるそれぞれの側部部分の少なくとも一方の厚みを、非オーバラップ部分のゴムシートの厚みより薄くした場合および、相互にオーバラップされるそれぞれの側部部分を側縁に向けて、直線状、ステップ状等に次第に薄肉にした場合のそれぞれにおいても同様である。   This is also true when the thickness of at least one of the side parts of the unvulcanized rubber sheet that are overlapped with each other is made thinner than the thickness of the rubber sheet of the non-overlapping part. The same applies to each of the cases where the respective side portions are gradually thinned in a straight line shape, a step shape or the like with the respective side portions facing the side edges.

また、この発明の後者の方法では、未加硫ゴムシートのそれぞれの側部部分を、それらに設けた、たとえば複数個の切欠き部で相互に隙間なく嵌め合わせて接合させることで、両側部部分の接合部の引張り剛性を、非接合部の一枚のゴムシートのそれとほぼ等しい一定値とすることができる。   In the latter method of the present invention, each side portion of the unvulcanized rubber sheet is fitted to each other with, for example, a plurality of notches without gaps, and joined to both sides. The tensile rigidity of the joint portion of the part can be a constant value substantially equal to that of one rubber sheet of the non-joint portion.

そして、この場合の接合部の不測の離隔等は、その接合部を、たとえばあり継ぎのように、両側部部分の相互の離隔を拘束し合う嵌め合い構造とすることで、有効に防止することができる。   And the unexpected separation of the joint part in this case is effectively prevented by making the joint part a fitting structure that constrains the mutual separation of both side parts, for example, like a joint. Can do.

図1は、一枚の未加硫ゴムシートのそれぞれの側部部分のオーバラップ接合様態を例示する要部略線斜視図であり、図1(a)は、未加硫ゴムシート1のそれぞれの側部にV字状の切欠き2を形成した状態で、それらの側部を、切欠き2の非形成部分をも含む範囲の側部部分に内外にオーバラップ接合させて筒状部材3としたものである。   FIG. 1 is a main part schematic perspective view illustrating an overlap joining state of each side portion of one unvulcanized rubber sheet, and FIG. 1 (a) is a diagram of each unvulcanized rubber sheet 1. In the state where the V-shaped cutouts 2 are formed on the side portions of the cylindrical member 3, the side portions are overlap-joined inside and outside to the side portion of the range including the portion where the cutouts 2 are not formed. It is what.

切欠き2の形成下で側部部分をオーバラップ接合させてなるこの筒状部材3は、その後、図2に略線斜視図で例示するように、たとえば、オーバラップ接合部4が内周側に延在する姿勢としてそれの両端部分を相互に接合することでエンドレスに構成される。   In this tubular member 3 formed by overlapping the side portions under the formation of the notches 2, the overlap bonding portion 4 is, for example, on the inner peripheral side as illustrated in a schematic perspective view in FIG. It is constructed endlessly by joining both end portions thereof as a posture extending to the end.

さらに、このエンドレス筒状部材5は、たとえば、加硫モールド内で、図示しない給排気バルブを介してその内側へ加熱加圧気体を供給することで、それが所期のチューブ径に拡径変形され、また、全体として所定の周長の円環形状に膨満変形されるインフレート成形を施されて加硫モールドの内面に所要の力で押圧され、そして、このインフレート状態のまま内部充填気体および加硫モールドからの加熱を受けることで加硫されて、製品空気のうとされる。   Furthermore, this endless cylindrical member 5 is expanded and deformed to an intended tube diameter by supplying heated and pressurized gas, for example, inside the vulcanization mold via a supply / exhaust valve (not shown). Inflation molding that is expanded and deformed into an annular shape with a predetermined circumference as a whole is pressed against the inner surface of the vulcanization mold with a required force, and the internal filling gas remains in this inflation state. And it is vulcanized by receiving heat from the vulcanization mold, and is made into product air.

ところで、図示のエンドレス筒状部材5をこのようにインフレート成形するに当っては、オーバラップ接合部それ自体の、幅方向および長さ方向のそれぞれの方向の引張り剛性が、その接合部4の側縁に向けて、V字状の切欠き2によるゴム体積の減少分に応じて次第に低下することになって、接合部4とそれに隣接する非オーバラップ部分との間の剛性段差が有効に緩和されることになるので、オーバラップ接合部4に隣接する領域への応力の集中、ひいては、その隣接領域への局部的な大きな伸長変形の発生が有利に抑制されることになる。   By the way, when the illustrated endless cylindrical member 5 is subjected to inflation molding in this manner, the tensile rigidity of the overlap joint portion itself in the width direction and the length direction is determined by the joint portion 4. The rigidity step between the joint 4 and the non-overlap portion adjacent to the joint 4 is effectively reduced toward the side edge as the rubber volume is gradually reduced by the V-shaped notch 2. Therefore, the concentration of stress in the region adjacent to the overlap joint 4 and, in turn, the occurrence of large local expansion deformation in the adjacent region is advantageously suppressed.

従って、エンドレス筒状部材5に加硫成形を施してなる製品空気のうにおいては、オーバラップ接合部および、そこへの隣接領域をも含む空気のうの全体を十分均質なものとすることができ、結果として、タイヤ内に収納した空気のうの、そのタイヤ内での拡張変形を十分均等に行わせることが可能となる。   Therefore, in the product air bladder formed by vulcanizing the endless tubular member 5, the entire air bladder including the overlap joint and the adjacent region therefor should be sufficiently homogeneous. As a result, the air bag accommodated in the tire can be expanded and deformed sufficiently uniformly in the tire.

また、図1(b)に示すオーバラップ接合部は、一枚の未加硫ゴムシート1のそれぞれの側部部分を、方形状の複数の切欠き6の形成によって櫛歯状に構成するとともに、櫛歯状構成部分だけを内外にオーバラップ接合させたものである。   In addition, the overlap joint portion shown in FIG. 1 (b) is configured such that each side portion of one unvulcanized rubber sheet 1 is formed in a comb-teeth shape by forming a plurality of rectangular cutouts 6. In this case, only the comb-like components are overlap-joined inside and outside.

このオーバラップ接合部7では、その幅方向のいずれの位置にも、それぞれの側部部分の方形状の切欠き6が必ず存在することになるので、接合部7の引張り剛性を、それの全幅にわたって、所要の一定値に低減させることができる。   In this overlap joint portion 7, there is always a rectangular notch 6 in each side portion at any position in the width direction. Over time, it can be reduced to the required constant value.

そして、図1(c)に示す接合部は、未加硫ゴムシート1のそれぞれの側部に、図1(b)に示すところよりも相対的に短い長さの方形状の複数の切欠き8を設けるとともに、それらの側部を、切欠き8の非形成部分をも含む側部部分にオーバラップ接合させて筒状部材3としたものである。   1 (c) has a plurality of rectangular cutouts on the respective sides of the unvulcanized rubber sheet 1 that are relatively shorter in length than those shown in FIG. 1 (b). 8 is provided, and the side portions thereof are overlap-bonded to the side portion including the portion where the notch 8 is not formed to form the cylindrical member 3.

従って、ここにおけるオーバラップ接合部9では、それらの幅方向の中央域に、図1(a)に示すものと同様に、切欠きの存在しない二枚のゴムシートの接合になる高剛性部分が、そして、その中央域の各側部に、切欠き8の存在下で剛性がステップ状に低下した低剛性部分がそれぞれ存在することになる。   Accordingly, in the overlap joint portion 9 here, a high-rigidity portion that joins two rubber sheets not having a notch is formed in the central region in the width direction, as shown in FIG. And the low-rigidity part to which the rigidity fell in step shape in the presence of the notch 8 exists in each side part of the center area, respectively.

これがため、図1(b)および(c)に示すいずれの筒状部材3によっても、それらを図2に示すようにエンドレス接合して加硫する場合のインフレート成形時の、オーバラップ接合部7、9に隣接する領域へ局部的な伸長変形の発生を、接合部7、9の、少なくとも側部での剛性の低減に基いて、有効に抑制することができる。   For this reason, any of the cylindrical members 3 shown in FIGS. 1B and 1C are overlapped joints at the time of inflation molding when they are endlessly joined and vulcanized as shown in FIG. The occurrence of local expansion and deformation in the region adjacent to 7 and 9 can be effectively suppressed based on the reduction in rigidity of at least the side portions of the joint portions 7 and 9.

図3は、未加硫ゴムシートのそれぞれの側部部分の他の接合態様を示す要部平面図であり、これは、未加硫ゴムシートのそれぞれの側部部分を、それらに設けた切欠き部で相互に隙間なく嵌め合わせて接合させることで、接合部の引張り剛性を。それの全幅にわたって、非接合部のそれとほぼ等しくしたものである。   FIG. 3 is a main part plan view showing another joining mode of the respective side portions of the unvulcanized rubber sheet, and this is a cut view of each side portion of the unvulcanized rubber sheet provided on them. Tensile rigidity of the joint can be achieved by fitting the joints together without gaps at the notches. It is approximately equal to that of the non-joined part over its full width.

ここで、図3(a)に示す例は、それぞれの側部部分に形成した方形状の切欠き部を相互に嵌め合わせたものであり、図3(b)に示す例は、V字上の切欠き部を相互に隙間なく嵌め合わせたものであり、そして、図3(c)に示す例は、台形状の切欠き部をあり継ぎ様に抜け止め嵌合させたものである。   Here, the example shown in FIG. 3A is obtained by fitting square cutouts formed on the respective side portions to each other, and the example shown in FIG. In the example shown in FIG. 3 (c), trapezoidal notches are fitted and fitted in a joint-like manner.

図3に示す接合部によれば、接合部の剛性が、非接合部のそれとほぼ等しくなるので、エンドレスに接合した筒状部材のインフレート成形に際しては、その全体を一層均等に伸長変形させることができる。   According to the joint portion shown in FIG. 3, the rigidity of the joint portion is substantially equal to that of the non-joint portion. Therefore, when inflating the tubular member joined endlessly, the entire member is stretched and deformed more evenly. Can do.

図4は、相互にオーバラップ接合されるそれぞれの側部部分に貫通孔10を設けたものであり、図4(a)は、各側部部分に均一内径の貫通孔を、そして、図4(b)は、各側部部分に大小二種の貫通孔をそれぞれ形成して、オーバラップ接合部11の剛性を、その接合部11の両端部で、それの中央域より小さくしたものである。   FIG. 4 is a view in which through holes 10 are provided in the respective side portions that are overlap-joined with each other. FIG. 4A shows a through hole having a uniform inner diameter in each side portion, and FIG. (B) is one in which two types of large and small through-holes are formed in each side part, and the rigidity of the overlap joint 11 is made smaller at the both ends of the joint 11 than in the central region thereof. .

図5は、相互にオーバラップ接合されるそれぞれの側部部分の剛性を、側縁に向けて次第に薄肉にしたものであり、図5(a)に示す例は、オーバラップ接合される側部部分の一部に薄肉化を施し、また、図5(b)に示す例は、オーバラップ接合される側部部分の全体にわたって薄肉化を施したものである。   FIG. 5 shows the rigidity of the side portions that are overlap-bonded to each other gradually thinner toward the side edges. The example shown in FIG. A part of the portion is thinned, and the example shown in FIG. 5B is a case where the whole side portion to be overlap-joined is thinned.

これらの図4および5に示す接合態様によっても、図1(a)に示すものとほぼ同様の作用効果をもたらすことができる。   Also by these joining modes shown in FIGS. 4 and 5, it is possible to bring about the same effects as those shown in FIG.

図6は、未加硫ゴムシート1の側部部分を、先の提案技術におけるように相互にオーバラップ接合させるとともに、その未加硫ゴムシート1のオーバラップ域をさらに覆う、オーバラップ域幅より広幅で、未加硫ゴムシート1より薄肉のカバーゴム12を、いずれか一方の表面側に接合させて接合部13とし、そのオーバラップ接合部およびカバーゴム12を含むこの接合部13の幅方向の剛性を、そのカバーゴム12の、オーバラップ接合部からのはみ出し部分でとくに小さくしたものである。   FIG. 6 shows an overlap region width in which the side portions of the unvulcanized rubber sheet 1 are overlap-joined with each other as in the previously proposed technique, and the overlap region of the unvulcanized rubber sheet 1 is further covered. A cover rubber 12 which is wider and thinner than the unvulcanized rubber sheet 1 is joined to one of the surface sides to form a joint 13, and the width of the joint 13 including the overlap joint and the cover rubber 12. The rigidity in the direction is particularly reduced at the portion of the cover rubber 12 that protrudes from the overlap joint.

これによれば、カバーゴム12の作用下で、接合部13の幅方向での剛性段差を緩和することによって、図1(a)に示すものとほぼ同様の作用効果をもたらすことができる。   According to this, by relaxing the rigidity step in the width direction of the joint portion 13 under the action of the cover rubber 12, it is possible to bring about substantially the same effect as that shown in FIG.

未加硫ゴムシートの接合部の態様を種々に変更して、その接合部の側部に隣接する非接合部分の、インフレート成形時の周方向への伸長変形量を、エンドレス筒状部材の、チューブの直径方向の対抗部分の変形量と対比したところ表1に示す結果を得た。   Various aspects of the joint portion of the unvulcanized rubber sheet were changed, and the amount of elongation deformation in the circumferential direction during inflation molding of the non-joint portion adjacent to the side portion of the joint portion was changed to that of the endless tubular member. The results shown in Table 1 were obtained when compared with the deformation amount of the opposing portion in the diameter direction of the tube.

ここで、エンドレス筒状部材は、サイズが495/45 R22.5のタイヤに適用する空気のう用とし、ゴムシートの厚みを2mm、接合部の全幅を40mmとした。   Here, the endless tubular member was used for an air bladder applied to a tire having a size of 495/45 R22.5, the thickness of the rubber sheet was 2 mm, and the total width of the joint portion was 40 mm.

なお、表1には、ゴムシートの側部部分の接合態様も併せて示す。   Table 1 also shows the joining mode of the side portion of the rubber sheet.

Figure 2008149609
Figure 2008149609

表1によれば、実施例1〜6はいずれも、従来例に比して伸長変形量の差を大きく低減させることができる。   According to Table 1, any of Examples 1 to 6 can greatly reduce the difference in the amount of expansion and deformation as compared with the conventional example.

未加硫ゴムシートの側部部分のオーバラップ接合態様を例示する要部略線斜視図である。It is a principal part schematic line perspective view which illustrates the overlap joining aspect of the side part of an unvulcanized rubber sheet. エンドレス筒状部材を示す略線斜視図である。It is a rough-line perspective view which shows an endless cylindrical member. 未加硫ゴムシートの側部部分の他の接合態様を示す要部平面図である。It is a principal part top view which shows the other joining aspect of the side part of an unvulcanized rubber sheet. 他の接合態様を示す要部略線斜視図である。It is a principal part schematic line perspective view which shows another joining aspect. 他の接合態様を示す要部略線斜視図である。It is a principal part schematic line perspective view which shows another joining aspect. さらに他の接合態様を示す要部略線斜視図である。It is a principal part schematic line perspective view which shows other joining aspects.

符号の説明Explanation of symbols

1 未加硫ゴムシート
2、6、8 切欠き
3 筒状部材
4、7、9、11 オーバラップ接合部
5 エンドレス筒状部材
10 貫通孔
12 カバーゴム
13 接合部
DESCRIPTION OF SYMBOLS 1 Unvulcanized rubber sheet 2, 6, 8 Notch 3 Tubular member 4, 7, 9, 11 Overlap joint part 5 Endless tubular member 10 Through-hole 12 Cover rubber 13 Joint part

Claims (7)

タイヤに収納されて内圧を充填され、タイヤ内圧の低下に伴って拡張変形して、荷重の支持をタイヤから肩代わりする中空円環状の空気のうを、未加硫ゴムシートの両側部部分を接合して筒状部材とし、この筒状部材をエンドレスに接合した後、それをインフレート下で加硫することにより製造するに当り、
未加硫ゴムシートの側部部分の接合部の、それの幅方向および長さ方向の引張り剛性を、未加硫ゴムシート同士のオーバラップ域のそれぞれの側縁に向けて、または、そのオーバラップ域をさらに覆うカバーゴムのそれぞれの側縁に向けて次第に低下させる安全タイヤ用空気のうの製造方法。
It is stored in the tire and filled with the internal pressure, and expands and deforms as the tire internal pressure decreases. Then, after making this cylindrical member endlessly joined, in manufacturing it by vulcanizing it under inflation,
The tensile rigidity in the width direction and the length direction of the joint portion of the side portion of the unvulcanized rubber sheet is directed toward each side edge of the overlap region between the unvulcanized rubber sheets or the overlap thereof. A method for producing a pneumatic tire bladder for safety tires that gradually decreases toward the respective side edges of the cover rubber that further covers the lap region.
前記引張り剛性を、一枚の未加硫ゴムシートの剛性を1としたとき、接合部のいずれの部分においても、80%以上で200%未満とする請求項1に記載の安全タイヤ用空気のうの製造方法。   2. The safety tire air according to claim 1, wherein the tensile rigidity is 80% or more and less than 200% in any part of the joint portion when the rigidity of one unvulcanized rubber sheet is 1. The manufacturing method of sea bream. 未加硫ゴムシートの、相互にオーバラップされるそれぞれの側部部分に切欠きを形成する請求項1もしくは2に記載の安全タイヤ用空気のうの製造方法。   The method for producing a safety tire pneumatic bladder according to claim 1 or 2, wherein notches are formed in the respective side portions of the unvulcanized rubber sheet that overlap each other. 未加硫ゴムシートの、相互にオーバラップされるそれぞれの側部部分に貫通孔を形成する請求項1もしくは2に記載の安全タイヤ用空気のうの製造方法。   The method for producing a pneumatic tire bladder according to claim 1 or 2, wherein a through hole is formed in each of the side portions of the unvulcanized rubber sheet that overlap each other. 未加硫ゴムシートの、相互にオーバラップされるそれぞれの側部部分の少なくとも一方の厚みを非オーバラップ部分のそれより薄くする請求項1もしくは2に記載の安全タイヤ用空気のうの製造方法。   The method for producing a pneumatic tire bladder according to claim 1 or 2, wherein the thickness of at least one of the side portions of the unvulcanized rubber sheet that overlap each other is made thinner than that of the non-overlapping portion. . 未加硫ゴムシートの、相互にオーバラップされるそれぞれの側部部分を、側縁に向けて次第に薄肉にする請求項1もしくは2に記載の安全タイヤ用空気のうの製造方法。   The method for producing a pneumatic tire bladder according to claim 1 or 2, wherein the side portions of the unvulcanized rubber sheet that are overlapped with each other are gradually thinned toward the side edges. タイヤに収納されて内圧を充填され、タイヤ内圧の低下に伴って拡張変形して、荷重の支持をタイヤから肩代わりする中空円環状の空気のうを、未加硫ゴムシートの両側部部分を接合して筒状部材とし、この筒状部材をエンドレスに接合した後、それをインフレート下で加硫することにより製造するに当り、
未加硫ゴムシートのそれぞれの側部部分を、それらに設けた切欠き部で、相互に隙間なく嵌め合わせて接合させる安全タイヤ用空気のうの製造方法。
It is stored in the tire and filled with the internal pressure, and expands and deforms as the tire internal pressure decreases. Then, after making this cylindrical member endlessly joined, in manufacturing it by vulcanizing it under inflation,
A method for producing a pneumatic tire bladder for safety tires, in which the respective side portions of the unvulcanized rubber sheet are fitted and joined to each other at the notch provided in the unvulcanized rubber sheet.
JP2006341361A 2006-12-19 2006-12-19 Manufacturing method of air pouch for safety tire Withdrawn JP2008149609A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2006341361A JP2008149609A (en) 2006-12-19 2006-12-19 Manufacturing method of air pouch for safety tire

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2006341361A JP2008149609A (en) 2006-12-19 2006-12-19 Manufacturing method of air pouch for safety tire

Publications (1)

Publication Number Publication Date
JP2008149609A true JP2008149609A (en) 2008-07-03

Family

ID=39652327

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2006341361A Withdrawn JP2008149609A (en) 2006-12-19 2006-12-19 Manufacturing method of air pouch for safety tire

Country Status (1)

Country Link
JP (1) JP2008149609A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013153897A1 (en) * 2012-04-09 2013-10-17 横浜ゴム株式会社 Pneumatic tire
US20150101725A1 (en) * 2012-05-08 2015-04-16 The Yokohama Rubber Co., Ltd. Pneumatic Tire
WO2015116302A1 (en) * 2014-01-30 2015-08-06 Exxonmobil Chemical Patents Inc. Method of preparing an annular component useful as an air barrier and air barrier
US9902214B2 (en) * 2012-01-10 2018-02-27 The Yokohama Rubber Co., Ltd. Pneumatic tire

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9902214B2 (en) * 2012-01-10 2018-02-27 The Yokohama Rubber Co., Ltd. Pneumatic tire
WO2013153897A1 (en) * 2012-04-09 2013-10-17 横浜ゴム株式会社 Pneumatic tire
JP2013216200A (en) * 2012-04-09 2013-10-24 Yokohama Rubber Co Ltd:The Pneumatic tire
CN104220276A (en) * 2012-04-09 2014-12-17 横滨橡胶株式会社 Pneumatic tire
CN104220276B (en) * 2012-04-09 2016-10-26 横滨橡胶株式会社 Pneumatic tire
US20150101725A1 (en) * 2012-05-08 2015-04-16 The Yokohama Rubber Co., Ltd. Pneumatic Tire
WO2015116302A1 (en) * 2014-01-30 2015-08-06 Exxonmobil Chemical Patents Inc. Method of preparing an annular component useful as an air barrier and air barrier
CN105939842A (en) * 2014-01-30 2016-09-14 埃克森美孚化学专利公司 Method of preparing an annular component useful as an air barrier and air barrier

Similar Documents

Publication Publication Date Title
JPH0752275A (en) Assembling method of tire component on tire production drum, tire production drum, and production of tire
WO2006013681A1 (en) Air bladder for safety tire
JP2008149609A (en) Manufacturing method of air pouch for safety tire
JP3736968B2 (en) Pneumatic tire manufacturing method
JP4769727B2 (en) Inflatable bladder for tire manufacturing apparatus, manufacturing method thereof, and method of manufacturing tire for wheel
JPWO2006011325A1 (en) Air bag for safety tire
JP2007076392A (en) Air bladder and valve spud therefor
JP5052335B2 (en) Manufacturing method and manufacturing device for pneumatic tire for safety tire
JP2007050538A (en) Manufacturing method of reinforcing layer, manufacturing method of air bladder and molding drum
JP5087289B2 (en) Run-flat tire and assembly of run-flat tire and rim
JP2007160833A (en) Manufacturing method of annular hollow body
JP2007022045A (en) Shaping bladder for tire manufacture and tire manufacturing method
JP6484107B2 (en) Raw tire forming method
JP2002067612A (en) Pneumatic tire and its manufacturing method
JP4266874B2 (en) Method for producing reinforced pneumatic bladder for safety tire
JP4490712B2 (en) Method for manufacturing motorcycle tire
JP2005053271A (en) Manufacturing method of support for pneumatic runflat tire
JP4728594B2 (en) Second equipment for green tire molding
JP2007022411A (en) Bladder for safety tire, safety tire and manufacturing method of bladder for safety tire
JP2006240473A (en) Manufacturing device and method for air filling sac for safety tire
JPH0277307A (en) Assembly body of tire and rim
JP2005178596A (en) Reinforcing air bag for safe tire, and its manufacturing method
JP2007050535A (en) Manufacturing method of air bladder and safety tire
JP2007083655A (en) Method for manufacturing annular hollow article
JP2009166294A (en) Manufacturing method of air pouch for safety tire

Legal Events

Date Code Title Description
A300 Application deemed to be withdrawn because no request for examination was validly filed

Free format text: JAPANESE INTERMEDIATE CODE: A300

Effective date: 20100302