JPH0446219B2 - - Google Patents
Info
- Publication number
- JPH0446219B2 JPH0446219B2 JP59181143A JP18114384A JPH0446219B2 JP H0446219 B2 JPH0446219 B2 JP H0446219B2 JP 59181143 A JP59181143 A JP 59181143A JP 18114384 A JP18114384 A JP 18114384A JP H0446219 B2 JPH0446219 B2 JP H0446219B2
- Authority
- JP
- Japan
- Prior art keywords
- former
- tire
- notch
- ply
- joint part
- 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.)
- Expired - Lifetime
Links
- 238000000465 moulding Methods 0.000 claims description 7
- 239000011324 bead Substances 0.000 description 6
- 238000004804 winding Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/08—Building tyres
- B29D30/20—Building tyres by the flat-tyre method, i.e. building on cylindrical drums
- B29D30/24—Drums
- B29D30/26—Accessories or details, e.g. membranes, transfer rings
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tyre Moulding (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
この発明は、タイヤの成形に用いられるドラム
型のフオーマに関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a drum-shaped former used for forming tires.
（従来技術とその問題点）
例えばスチールラジアルタイヤの一次成形で
は、ドラム型のフオーマ上にインナーライナーを
貼り付け、その上にカーカスプライを貼り付けた
のち、ビードコアをセツトし、以下、巻上げ、チ
エーフア貼付け、巻込みの順で作業が行なわれ
る。この場合、タイヤのユニフオーミテイを損わ
ないように、それぞれの部材の継目となるジヨイ
ント部は、互いに重なり合わない位置に設けられ
る。(Prior art and its problems) For example, in the primary forming of a steel radial tire, an inner liner is pasted on a drum-shaped former, a carcass ply is pasted on top of that, a bead core is set, and the process is followed by winding and chief forming. The work is done in the order of pasting and wrapping. In this case, the joint portions that serve as joints between the respective members are provided at positions that do not overlap with each other so as not to damage the uniformity of the tire.
ところで、従来のフオーマを用いて成形したタ
イヤでは、インナーライナーのジヨイント部とカ
ーカスプライのジヨイント部のコードパスが、第
１図に示すようにタイヤ周上の他の部分に較べて
長くなり、第２図および第３図に示す如く、この
部分でRFV（上下方向のフオースバリエーシヨ
ン）とタイヤアンジヨレーシヨン（LRO）が大
きくなり、タイヤのユニフオーミテイ、バルジ、
デントの状態に悪影響を及ぼしていた。 By the way, in a tire molded using a conventional former, the cord path at the joint part of the inner liner and the joint part of the carcass ply is longer than other parts on the circumference of the tire, as shown in Figure 1. As shown in Figures 2 and 3, RFV (vertical force variation) and tire angulation (LRO) increase in this area, causing tire uniformity, bulge, and
It was having a negative impact on Dent's condition.
（発明の目的）
本発明は、インナーライナ、カーカスプライの
ジヨイント部におけるコードパスのバラツキを低
減し、これらジヨイント部におけるバルジ、デン
トの状態が良好でユニフオーミテイにすぐれたタ
イヤを成形することのできるタイヤ成形用フオー
マを提供することを目的としている。(Object of the Invention) The present invention reduces the variation in the cord path at the joints of the inner liner and carcass ply, and makes it possible to mold a tire with good bulges and dents in these joints and excellent uniformity. The purpose is to provide a former for molding.
（発明の構成）
本発明にかかるタイヤ成形用フオーマは、ドラ
ム型のフオーマの側端部外周上の所定位置に、外
側が深く内側が浅くなるように底面が傾斜した側
面に抜ける溝状の切欠き部を設けたことを特徴と
するものである。(Structure of the Invention) The tire molding former according to the present invention has a groove-like cut formed at a predetermined position on the outer periphery of the side end of the drum-shaped former, the groove-like cut extending through the side surface with an inclined bottom surface so that the outside is deep and the inside is shallow. It is characterized by the provision of a notch.
（実施例）
以下、図面にあらわされた実施例について説明
すれば、第４図は本発明にかかるタイヤ成形用フ
オーマの１実施例をあらわす斜視図であつて、こ
のフオーマ１はドラム型に形成され、その外周上
の両側端部は浅い溝状の切欠き部２，２がそれぞ
れ１個づつ設けられている。(Embodiment) The embodiment shown in the drawings will be described below. FIG. 4 is a perspective view showing an embodiment of the tire molding former according to the present invention, and this former 1 is formed into a drum shape. One shallow groove-shaped notch 2, 2 is provided on each side end portion of the outer periphery.
切欠き部２は、第５図ａ，ｂ，ｃに示すよう
に、フオーマの軸方向中間部から側端部に抜ける
溝として形成されており、内側が浅く、外側が深
くなるように底面が傾斜し、さらに側壁部２ａは
角度αの傾斜面として形成されている。また、切
欠き部２の巾Ｗは、内側が狭く、外側が広くなつ
ており、切上り部（内側端部）２ｂは平面視円弧
状を呈している。なお、切欠き部２の外側の端部
（開放端部）の両縁部２ｃには丸ミ付けが施され
ている。図中、３はスペーサー、４はセクターで
ある。 As shown in FIGS. 5a, b, and c, the notch 2 is formed as a groove extending from the axial middle part of the former to the side end, and the bottom surface is shallower on the inside and deeper on the outside. Further, the side wall portion 2a is formed as an inclined surface having an angle α. Further, the width W of the notch portion 2 is narrow on the inside and wide on the outside, and the cut-out portion (inner end portion) 2b has an arc shape in plan view. Note that both edges 2c of the outer end (open end) of the notch 2 are rounded. In the figure, 3 is a spacer and 4 is a sector.
この切欠き部２は、タイヤ成形時にカーカスプ
ライのジヨイント部およびインナーライナのジヨ
イント部を位置させるためのもので、その形状寸
法は、例えば第１図に示すようなデータ等を考慮
して定めるべきもので、タイヤの種類等に応じて
最適のものとすればよいが、通常は、ｔ＝１〜３
mm、Ｗ＝20〜50mm、Ｌ＝30〜100mmの範囲とする
のが好ましい。また、角αの値は５〜20度とする
のが好ましい。なお、ビードと接する端面は、ビ
ードセツト時の圧力の変化を防ぐため、他の部分
と同一面とするのがよい。 This notch 2 is for positioning the joint part of the carcass ply and the joint part of the inner liner during tire molding, and its shape and dimensions should be determined by taking into account data such as the one shown in Figure 1. The optimum value can be selected depending on the type of tire, etc., but usually t=1 to 3.
mm, W=20 to 50 mm, and L=30 to 100 mm. Further, the value of the angle α is preferably 5 to 20 degrees. Note that the end surface in contact with the bead is preferably flush with other parts in order to prevent changes in pressure when setting the bead.
このフオーマを用いてスチールラジアルタイヤ
の一次成形を行なう場合は、前述の如くインナー
ライナとカーカスプライのジヨイント部を切欠部
２の位置に位置させる。ジヨイント部は、プライ
が重複して他の部分よりプライ１枚分だけ多くな
るので、第６図ａ，ｂに示すように外側のプライ
の巻上げ高さC′が他の部分の巻上げ高さＣよりも
小さくなる（Ｃ＞C′）。すなわち、従来のフオー
マにおいては、第６図ｂ（ジヨイント部）におけ
るビード９の内側の点P′は同図ａ（ジヨイント部
以外の部分）における点Ｐよりもプライ１枚分だ
けロングパスを通り、同図ｂにおけるビード９の
外側の点Q′は同図ａにおける点Ｑよりもプライ
１枚分だけロングパスを通るので、ジヨイント部
における外側のプライの巻上げ高さC′がその分だ
け小さくなるので、図中、７はインスレーシヨン
である。 When performing primary forming of a steel radial tire using this former, the joint portion of the inner liner and carcass ply is positioned at the position of the notch 2 as described above. At the joint part, plies overlap and there is one more ply than other parts, so as shown in Figure 6a and b, the winding height C' of the outer ply is equal to the winding height C of the other parts. (C>C'). That is, in the conventional former, the point P' inside the bead 9 in FIG. 6b (joint part) passes through a longer path by one ply than the point P in FIG. 6a (part other than the joint part), Since the point Q' on the outside of the bead 9 in Figure b passes through a longer path by one ply than the point Q in Figure A, the winding height C' of the outer ply at the joint part becomes smaller by that amount. , in the figure, 7 is an insertion.
一方、本発明においては、外側が低くなるよう
に底面が傾斜した切欠き部２が設けられており、
この部分では、ビード７のまわりを通つて巻き上
げられるプライのコードパスを他の部分よりも短
くすることができる。この様子を図示すれば、第
７図のようであり、切欠きのない部分ａのコード
パスＤよりも切欠き部２におけるコードパス
D′の方が小さくなる（Ｄ＞D′）。このＤとD′との
差をプライ１枚分とすると、切欠き部２にジヨイ
ント部を位置させたときのコードパスが他の部分
のそれと一致することになる。 On the other hand, in the present invention, the notch 2 is provided with the bottom surface inclined so that the outside is lower,
In this part, the cord path of the ply wound around the bead 7 can be made shorter than in other parts. If this situation is illustrated, it is as shown in FIG.
D' becomes smaller (D>D'). If the difference between D and D' is one ply, the code path when the joint portion is located in the notch portion 2 will match that of the other portions.
第８図および第９図は、従来のフオーマを用い
る場合と、本実施例のフオーマを用いる場合のジ
ヨイント部の状態をあらわすものである。第８図
ａに示すような従来のフオーマでは、同図ｂに示
すようにプライ１０を巻き上げた場合にジヨイン
ト部Ｊに凹状の乱れＲが生じ、タイヤのユニフオ
ーミテイが損われるが、第９図ａに示すように本
実施例のフオーマを用いる場合は、同図ｂに示す
ようにジヨイント部Ｊが他の部分と同様な状態と
なり、タイヤのユニフオーミテイが向上する。こ
の様子は第１０図および第１１図に示されている
通りであり、これらの図から、本実施例のフオー
マを用いると、コードパスのバラツキが約半減す
るとともに、フオースバリエーシヨンも大幅に減
少することがわかる。数値的には、RFVで約１
Kgｆ、LFVで約0.5Kgｆ改良され、平均波形的に
もジヨイント部でFV（フオースバリエーシヨン）
の変化は見られなくなる。 FIG. 8 and FIG. 9 show the state of the joint portion when the conventional former is used and when the former of this embodiment is used. In the conventional former shown in FIG. 8a, when the ply 10 is rolled up as shown in FIG. When the former of this embodiment is used as shown in FIG. 2B, the joint J is in the same state as the other parts as shown in FIG. 1B, and the uniformity of the tire is improved. This situation is as shown in FIGS. 10 and 11, and from these figures, it can be seen that when the format of this embodiment is used, the variation in the code path is reduced by approximately half, and the force variation is also significantly reduced. It can be seen that this decreases. Numerically, RFV is about 1
Kgf and LFV have been improved by approximately 0.5 Kgf, and the average waveform also has FV (force variation) at the joint part.
No change can be seen.
（発明の効果）
以上の説明から明らかなように、本発明にかか
るタイヤ成形用フオーマは、これを使用してタイ
ヤの成形を行なう場合に、プライのコードパスの
バラツキが少なく、ジヨイント部での急激なコー
ドパスの乱れがなくなるすぐれたものである。こ
のため、製品であるタイヤのユニフオーミテイが
向上し、インナーライナーやカーカスプライのジ
ヨイント部でのバツジ、バルジ、デント等の状態
が良好となる。(Effects of the Invention) As is clear from the above description, when the tire molding former according to the present invention is used to mold a tire, there is little variation in the cord path of the plies, and there is less variation at the joint part. This is an excellent feature that eliminates sudden code path disturbances. For this reason, the uniformity of the tire product is improved, and the condition of bumps, bulges, dents, etc. at the joint portions of the inner liner and carcass plies is improved.
第１図、第２図、第３図は従来のフオーマを用
いてタイヤの成形を行なつた場合のタイヤの性能
をあらわすグラフ、第４図は本発明にかかるフオ
ーマの１実施例の斜視図、第５図ａ，ｂ，ｃは切
欠き部のそれぞれＳ−Ｓ断面図、平面図、側面
図、第６図ａ，ｂおよび第７図ａ，ｂは成形法の
説明図であつて、ａはジヨイント部以外の部分の
断面図、ｂはジヨイント部の断面図、第８図ａ，
ｂは従来のフオーマの使用状態をあらわす断面図
とＸ矢視図、第９図ａ，ｂは本発明にかかるフオ
ーマの使用状態をあらわす断面図とＹ矢視図、第
１０図および第１１図は成形されたタイヤの性能
をあらわすグラフである。
１……フオーマ、２……切欠き部。
FIGS. 1, 2, and 3 are graphs showing tire performance when tires are formed using conventional formers, and FIG. 4 is a perspective view of one embodiment of the former according to the present invention. , FIGS. 5a, b, and c are SS sectional views, plan views, and side views of the notch, respectively, and FIGS. 6a, b, and 7a, b are explanatory views of the molding method, a is a sectional view of the part other than the joint part, b is a sectional view of the joint part, Fig. 8a,
9b is a cross-sectional view and a view in the direction of the X arrow showing the state of use of a conventional former; FIGS. 9a and b are a sectional view and a view in the direction of the Y direction showing the state of use of the former according to the present invention; is a graph showing the performance of the molded tire. 1...former, 2...notch part.
Claims (1)
フオーマの側端部外周上の所定位置に、外側が深
く内側が浅くなるように底面が傾斜した側面に抜
ける溝状の切欠き部を設けたことを特徴とするタ
イヤ成形用フオーマ。1 In a drum-type former for tire molding,
A former for forming a tire, characterized in that a groove-shaped notch is provided at a predetermined position on the outer periphery of a side end of the former, and the groove-like notch extends through the side surface with an inclined bottom surface so that the outside is deep and the inside is shallow.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59181143A JPS6158726A (en) | 1984-08-30 | 1984-08-30 | Time former |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59181143A JPS6158726A (en) | 1984-08-30 | 1984-08-30 | Time former |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6158726A JPS6158726A (en) | 1986-03-26 |
| JPH0446219B2 true JPH0446219B2 (en) | 1992-07-29 |
Family
ID=16095638
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59181143A Granted JPS6158726A (en) | 1984-08-30 | 1984-08-30 | Time former |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6158726A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1625931B1 (en) * | 2003-05-20 | 2008-09-24 | The Yokohama Rubber Co., Ltd. | Method of producing pneumatic radial tire |
-
1984
- 1984-08-30 JP JP59181143A patent/JPS6158726A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6158726A (en) | 1986-03-26 |
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