JPH0313976B2 - - Google Patents
Info
- Publication number
- JPH0313976B2 JPH0313976B2 JP58019107A JP1910783A JPH0313976B2 JP H0313976 B2 JPH0313976 B2 JP H0313976B2 JP 58019107 A JP58019107 A JP 58019107A JP 1910783 A JP1910783 A JP 1910783A JP H0313976 B2 JPH0313976 B2 JP H0313976B2
- Authority
- JP
- Japan
- Prior art keywords
- bead core
- groove
- tire body
- bead
- tire
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C15/00—Tyre beads, e.g. ply turn-up or overlap
- B60C15/04—Bead cores
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tyre Moulding (AREA)
- Tires In General (AREA)
Description
【発明の詳細な説明】
この発明は、自動四輪車、自動二輪車、軽輪
車、農耕車輪、レジヤー用車輪等に使用すること
のできる注型タイヤに関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cast tire that can be used for four-wheeled motor vehicles, motorcycles, light-wheeled vehicles, agricultural wheels, leisure wheels, and the like.
熱可塑性エラストマー、熱可塑性樹脂等の成形
材料を用いて成形した注型タイヤが使用されてい
る。このような注型タイヤに１個または２個以上
のビードコアを入れる方法として、(i)タイヤ本体
の成形時に同時に埋設する方法、(ii)タイヤ本体の
成形時にビード部に溝状凹部を形成しておき、タ
イヤ本体の成形後にこの溝状凹部にビードコアを
嵌め込む方法、の２通りの方法が従来採用されて
きた。 Cast tires are used that are molded using molding materials such as thermoplastic elastomers and thermoplastic resins. Methods of inserting one or more bead cores into such a cast tire include (i) embedding them at the same time when the tire body is molded, and (ii) forming groove-like recesses in the bead portion during molding of the tire body. Conventionally, two methods have been adopted: a method in which a bead core is fitted into the groove-like recess after the tire body is molded.
しかしながら、上記(i)の方法では、注型時の注
入圧力に耐えられるようにビードコアをピン等で
強固に保持する必要があるので、製品にピン跡等
が残ることになり好ましくない。また、上記(ii)の
方法では、ビードコアを確実に保持するため、ビ
ードコアと溝状凹部との嵌合を厳しくする必要が
あるが、最適な嵌合状態を得ることは実際上困難
であり、ビードコアによつてビード部が損傷する
ことが多かつた。 However, in method (i) above, it is necessary to firmly hold the bead core with a pin or the like so as to withstand the injection pressure during casting, which is undesirable because it leaves pin marks on the product. In addition, in the method (ii) above, in order to securely hold the bead core, it is necessary to tighten the fit between the bead core and the groove-shaped recess, but it is practically difficult to obtain an optimal fitted state. The bead portion was often damaged by the bead core.
この発明は、熱可塑性エラストマーまたは熱可
塑性樹脂を成形材料として用いた注型タイヤにお
いて、ビードコアをうまく埋設することができる
ような注型タイヤの製法を提供することを目的に
なされたもので、外に開口する溝状凹部をビード
部に設けたタイヤ本体を熱可塑性エラストマーま
たは熱可塑性樹脂を用いて注型成形し、この溝状
凹部に強磁性を有する金属材料でつくられたビー
ドコアを嵌め込んだのち、該溝状凹部にタイヤ本
体と同質の材料でつくられた栓体を嵌合し、高周
波誘導加熱によつてビードコアを加熱し、その熱
でタイヤ本体と栓体とを溶着一体化することを特
徴としている。以下、実施例をあらわす図面にも
とづいて説明する。 This invention was made for the purpose of providing a method for manufacturing a cast tire using a thermoplastic elastomer or thermoplastic resin as a molding material, in which a bead core can be successfully embedded. A tire body with a groove-like recess opening in the bead part is cast-molded using thermoplastic elastomer or thermoplastic resin, and a bead core made of a ferromagnetic metal material is fitted into the groove-like recess. After that, a plug made of the same material as the tire body is fitted into the groove-like recess, the bead core is heated by high-frequency induction heating, and the tire body and plug are welded and integrated with the heat. It is characterized by Embodiments will be described below based on drawings showing embodiments.
本発明にかかる製法では、先ず第１図に示す如
くビード部２に全周にわたつて溝状凹部を形成し
たタイヤ本体１を公知の注型法によつて成形す
る。タイヤ本体１用の成形材料としては、例えば
ポリエステル系エラストマー、ポリウレタン系エ
ラストマー、ポリオリレフイン系エラストマー等
の熱可塑性エラストマーを使用することができ
る。溝状凹部３の巾は、使用されるビードコア４
の巾よりも0.5〜１mm程度広くしておくのが好ま
しく、その深さは所定のビードコア埋設位置にビ
ードコア４が位置するようなものとする。また、
溝状凹部３の径は、ビードコア４の径と等しくし
ておく。 In the manufacturing method according to the present invention, first, as shown in FIG. 1, a tire body 1 having groove-like recesses formed around the entire circumference of the bead portion 2 is molded by a known casting method. As the molding material for the tire body 1, thermoplastic elastomers such as polyester elastomers, polyurethane elastomers, and polyolefin elastomers can be used. The width of the groove-like recess 3 is determined by the width of the bead core 4 used.
It is preferable to make the bead core 4 about 0.5 to 1 mm wider than the width of the bead core, and the depth is such that the bead core 4 is located at a predetermined bead core embedding position. Also,
The diameter of the groove-like recess 3 is made equal to the diameter of the bead core 4.
つぎに、第２図に示すようにタイヤ本体１の溝
状凹部３に必要数のビードコア４を嵌め込み、そ
の外側をタイヤ本体１と同質の成形材料で成形し
た栓体５で閉塞する。ビードコアとしては、適度
の強度をそなえ、かつ高周波誘導加熱によつて加
熱することができるような強磁性体、例えば鋼線
のような金属製品を使用する。栓体５はタイヤ本
体１と同様な成形材料、すなわち熱可塑性エラス
トマーで成形されるもので、溝状凹部３とほぼ等
しい肉厚をもつ環状体として形成され、上記ビー
ドコア４に当接するまで溝状凹部３内に挿入され
る。 Next, as shown in FIG. 2, a required number of bead cores 4 are fitted into the groove-like recesses 3 of the tire body 1, and the outside thereof is closed with a plug 5 molded from the same molding material as the tire body 1. As the bead core, a ferromagnetic material, such as a metal product such as a steel wire, is used that has appropriate strength and can be heated by high-frequency induction heating. The plug body 5 is molded from the same molding material as the tire body 1, that is, a thermoplastic elastomer, and is formed as an annular body having a wall thickness approximately equal to that of the groove-shaped recess 3. It is inserted into the recess 3.
ビードコア４を挿入した溝状凹部３を栓体５で
閉塞したら、高周波誘導加熱によつて強磁性材料
でつくられたビードコアを加熱し、栓体５をタイ
ヤ本体１に溶着させる。高周波誘導加熱用のコイ
ル６は、ビードコア４全体が同時に均一に加熱さ
れるようにビードコア４に沿つて全周に配置する
のが好ましいが、ビードコア４は金属材料でつく
られ、熱伝導性に富んでいるので、条件によつて
はコイル６を全周に設けておかなくとも全体的に
均一に加熱することが可能である。コイル６をビ
ード部２の周上の特定の個所付近に設けておき、
ビード部２が全周にわたつてこのコイル設置個所
を通るようにタイヤ本体１を回転させつつ順次加
熱しておくようにしてもよい。高周波誘導加熱の
発振周波数は100KHz〜5MHz程度とすることが好
ましいが、これに限るものではない。なお、加熱
中は、第２図に示ように当て板７，７′等を用い
て溶融接着部を１〜５Kg／cm2の圧力で挾圧するの
が望ましい。 After the groove-shaped recess 3 into which the bead core 4 has been inserted is closed with the plug 5, the bead core made of a ferromagnetic material is heated by high-frequency induction heating, and the plug 5 is welded to the tire body 1. The coil 6 for high-frequency induction heating is preferably arranged all around the bead core 4 so that the entire bead core 4 is heated uniformly at the same time, but the bead core 4 is made of a metal material and has high thermal conductivity. Therefore, depending on the conditions, it is possible to uniformly heat the entire area without having to provide the coil 6 all around the circumference. The coil 6 is provided near a specific point on the circumference of the bead portion 2,
The tire body 1 may be sequentially heated while being rotated so that the bead portion 2 passes through this coil installation location over the entire circumference. The oscillation frequency of high-frequency induction heating is preferably about 100 KHz to 5 MHz, but is not limited to this. During heating, it is desirable to clamp the molten bonded portion at a pressure of 1 to 5 kg/cm 2 using backing plates 7, 7', etc., as shown in FIG.
以上の操作によつて、栓体５とタイヤ本体１と
が一体化してビードコア埋設部の空隙部が消滅
し、ビード部が変形することなくビードコア４が
確実に保持された第３図に示すような注型タイヤ
１０が得られるのである。栓体溶着用の加熱を高
周波誘導加熱によつて行なうので、加熱作業が簡
単であり、加熱不用な部分まで加熱することがな
く、作業を能率的に行なうことができる。 Through the above operations, the plug body 5 and the tire body 1 are integrated, the gap in the bead core buried part disappears, and the bead core 4 is securely held without deforming the bead part, as shown in FIG. 3. A cast-molded tire 10 is obtained. Since the heating for welding the plug body is performed by high-frequency induction heating, the heating work is simple and the work can be carried out efficiently without heating parts that do not need to be heated.
以上に説明したように、本発明にかかる注型タ
イヤの製法は、ビード部の変形や大きな空隙の発
生がなく、ビードコアを所定位置に確実に固定す
ることができるすぐれたものである。ビードコア
がタイヤ本体の成形後に埋設されるため、注型時
におけるビードコア固定用のピン等が不要とな
り、製品にピン跡等が残留することもなくなつ
た。 As explained above, the method for manufacturing a cast tire according to the present invention is excellent in that it can reliably fix the bead core in a predetermined position without deforming the bead portion or creating a large gap. Since the bead core is embedded after the tire body is molded, there is no need for pins to fix the bead core during casting, and there are no pin marks left on the product.
第１図および第２図は本発明にかかる注型タイ
ヤの製法の説明図、第３図は注型タイヤの断面図
である。
１……タイヤ本体、２……ビード部、３……溝
状凹部、４……ビードコア、５……蓋体、６……
コイル、１０……注型タイヤ。
FIGS. 1 and 2 are explanatory diagrams of a method for manufacturing a cast tire according to the present invention, and FIG. 3 is a sectional view of the cast tire. DESCRIPTION OF SYMBOLS 1... Tire body, 2... Bead part, 3... Groove-shaped recessed part, 4... Bead core, 5... Lid body, 6...
Coil, 10...Cast tire.
Claims (1)
イヤ本体を熱可塑性エラストマーまたは熱可塑性
樹脂を用いて注型成形し、強磁性を有する金属材
料でつくられたビードコアを前記溝状凹部に嵌め
込んだのち、該溝状凹部にタイヤ本体と同質の材
料でつくられた栓体を嵌合し、高周波誘導加熱に
よつてビードコアを加熱し、その熱でタイヤ本体
と栓体とを溶着一体化することを特徴とする注型
タイヤの製法。1. A tire body with an outwardly opening groove-shaped recess in the bead part is cast-molded using thermoplastic elastomer or thermoplastic resin, and a bead core made of a ferromagnetic metal material is fitted into the groove-shaped recess. After that, a plug made of the same material as the tire body is fitted into the groove-like recess, the bead core is heated by high-frequency induction heating, and the heat is used to weld the tire body and the plug together. A method for producing cast tires characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58019107A JPS59145130A (en) | 1983-02-08 | 1983-02-08 | Preparation of cast tire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58019107A JPS59145130A (en) | 1983-02-08 | 1983-02-08 | Preparation of cast tire |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59145130A JPS59145130A (en) | 1984-08-20 |
| JPH0313976B2 true JPH0313976B2 (en) | 1991-02-25 |
Family
ID=11990254
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58019107A Granted JPS59145130A (en) | 1983-02-08 | 1983-02-08 | Preparation of cast tire |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59145130A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63203322A (en) * | 1987-02-19 | 1988-08-23 | Kyowa Seiki Kk | Method for welding plastic moldings |
| EP3165350B1 (en) * | 2010-03-30 | 2019-05-08 | Bridgestone Corporation | Tire forming mold |
| JP2019001413A (en) * | 2017-06-19 | 2019-01-10 | 株式会社ブリヂストン | Bead core and manufacturing method thereof, pneumatic tire |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51136762A (en) * | 1975-05-21 | 1976-11-26 | Toyo Tire & Rubber Co | Method of making casting tire |
-
1983
- 1983-02-08 JP JP58019107A patent/JPS59145130A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59145130A (en) | 1984-08-20 |
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