JPS6156084B2 - - Google Patents
Info
- Publication number
- JPS6156084B2 JPS6156084B2 JP55108025A JP10802580A JPS6156084B2 JP S6156084 B2 JPS6156084 B2 JP S6156084B2 JP 55108025 A JP55108025 A JP 55108025A JP 10802580 A JP10802580 A JP 10802580A JP S6156084 B2 JPS6156084 B2 JP S6156084B2
- Authority
- JP
- Japan
- Prior art keywords
- bladder
- tire
- cross
- wall thickness
- sectional area
- 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
Links
- 238000004904 shortening Methods 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 239000011324 bead Substances 0.000 description 1
- 238000004073 vulcanization Methods 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)
- B29D30/0601—Vulcanising tyres; Vulcanising presses for tyres
- B29D30/0654—Flexible cores therefor, e.g. bladders, bags, membranes, diaphragms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/36—Moulds for making articles of definite length, i.e. discrete articles
- B29C43/3642—Bags, bleeder sheets or cauls for isostatic pressing
-
- 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)
- B29D30/0601—Vulcanising tyres; Vulcanising presses for tyres
- B29D30/0654—Flexible cores therefor, e.g. bladders, bags, membranes, diaphragms
- B29D2030/0655—Constructional or chemical features of the flexible cores
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2030/00—Pneumatic or solid tyres or parts thereof
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
- Tyre Moulding (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Description
【発明の詳細な説明】
本発明はタイヤ加硫機用ブラダの改良に関する
ものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in bladders for tire vulcanizers.
タイヤ加硫機においてタイヤを加硫するためブ
ラダと称するゴム製部材を使用する型式のタイヤ
加硫機があり、従来、第１図及び第２図に示すよ
うなブラダが使用されていた。 2. Description of the Related Art There is a type of tire vulcanizer that uses a rubber member called a bladder to vulcanize tires, and conventionally, bladders such as those shown in FIGS. 1 and 2 have been used.
第１図は、クローズエンド型のいわゆる下端開
放型ブラダ１を示し、第２図はオープンエンド型
のいわゆる上・下端開放型ブラダ２を示すもの
で、いずれの場合も、上・下クランプ部１ａ，１
ｂ及び２ａ，２ｂを除き、ブラダの肉厚は一定で
あつた。 Fig. 1 shows a closed-end type bladder 1 with open bottom ends, and Fig. 2 shows an open-end type bladder 2 with open upper and lower ends. ,1
The wall thickness of the bladder was constant except for b and 2a, 2b.
スタンデングポスト型のタイヤ加流機では、加
硫終了後、タイヤからブラダを取出す際、ブラダ
内に真空をかけブラダをその軸線方向に機械的に
伸長させるが、上記のように、ブラダの肉厚が同
じである場合、ブラダの上下方向各部における断
面の断面積が異なつてくるため、各部の応力の違
いにより、部分的に無理な応力がかかり、このた
めブラダの寿命を短かくする問題があつた。特
に、タイヤ品質向上、グリーンタイヤの内径に近
い外径を特つたブラダを使用することが望ましい
が、ラジアルタイヤの場合、グリーンタイヤの径
が製品タイヤの径に近く、ブラダ外径を大きくし
たいが、加硫済タイヤからブラダを取出す際、ブ
ラダを使用することが望ましいが、ラジアルタイ
ヤの場合、グリーンタイヤの径が製品タイヤの径
に近く、ブラダ外径を大きくしたいが、加硫済タ
イヤからブラダを取出す際、ブラダ外径をタイヤ
のビード径より小さくしてブラダを通す必要があ
り、このため、ブラダの伸長を大きくしなければ
ならず、断面積の小さい部分に無理な応力がかか
り、ブラダの寿命を短かくする原因となつてい
た。 In a standing post type tire flow machine, when removing the bladder from the tire after vulcanization, a vacuum is applied inside the bladder to mechanically stretch the bladder in its axial direction. If the thickness is the same, the cross-sectional area of each part of the bladder in the vertical direction will be different, which will cause unreasonable stress to be applied to some parts due to the difference in stress in each part, which will shorten the life of the bladder. It was hot. In particular, to improve tire quality, it is desirable to use a bladder with an outer diameter close to the inner diameter of a green tire, but in the case of radial tires, the diameter of the green tire is close to the diameter of the product tire, and it is desirable to increase the outer diameter of the bladder. It is desirable to use a bladder when removing the bladder from a vulcanized tire, but in the case of radial tires, the diameter of the green tire is close to the diameter of the product tire, and it is desirable to increase the outer diameter of the bladder, but it is difficult to remove the bladder from the vulcanized tire. When removing the bladder, it is necessary to make the outer diameter of the bladder smaller than the bead diameter of the tire to allow the bladder to pass through, which requires the bladder to be extended, which places undue stress on the small cross-sectional area. This was a cause of shortening the lifespan of the bladder.
本発明は上記した点に鑑み、提案されたもの
で、ブラダのクランプ部を除いた部分の肉厚を、
上下クランプ部に近づくにしたがつて厚くして、
上下方向各部におけるブラダ表面と直交する面で
切断した場合の断面積が略同一となるようにした
ことを特徴とし、その目的とするところは、前記
した従来のものの問題点を解消することのできる
タイヤ加硫機用ブラダを提供しようとするもので
ある。 The present invention was proposed in view of the above points, and the wall thickness of the portion of the bladder excluding the clamp portion is
The closer you get to the upper and lower clamps, the thicker it becomes.
It is characterized by having approximately the same cross-sectional area when cut along a plane perpendicular to the bladder surface in each part in the vertical direction, and its purpose is to solve the problems of the conventional products described above. It is an object of the present invention to provide a bladder for a tire vulcanizer.
本発明は、上記の構成により、ブラダ各部の応
力（伸び）が等しくなり、従つて、部分的な応力
集中によるブラダの寿命短縮を防止することがで
きる。 According to the present invention, with the above configuration, the stress (elongation) of each part of the bladder becomes equal, and therefore, shortening of the life of the bladder due to local stress concentration can be prevented.
以下、本発明を図示実施例に基づいて説明す
る。 Hereinafter, the present invention will be explained based on illustrated embodiments.
第３図はクローズエンド型ブラダ１０を、第４
図はオープンエンド型ブラダ２０を示し、それぞ
れ上・下クランプ部１０ａ，１０ｂ及び２０ａ，
２０ｂに近づくにしたがい肉厚が厚くなるように
形成して、上下方向各部におけるブラダ表面と直
交する面で切断した場合の断面積が略同一となる
ようにしている。 FIG. 3 shows the closed-end bladder 10 and the fourth
The figure shows an open-end bladder 20, with upper and lower clamp parts 10a, 10b and 20a, respectively.
It is formed so that the wall thickness increases as it approaches 20b, so that the cross-sectional area when cut along a plane orthogonal to the bladder surface at each portion in the vertical direction is approximately the same.
すなわち、第３図に示すクローズエンド型ブラ
ダ１０の場合、断面イ―イ，ロ―ロ，ハ―ハの断
面積が同一になるように連続的に肉厚を変化さ
せ、第４図に示すオープンエンド型ブラダ２０の
場合、断面ａ―ａ，ｂ―ｂ，ｃ―ｃの断面積が同
一になるように連続的に肉厚を変化させている。 That is, in the case of the closed-end type bladder 10 shown in FIG. 3, the wall thickness is continuously changed so that the cross-sectional areas of the cross sections E-I, Ro-RO, and H-HA are the same, and the wall thickness is changed as shown in FIG. 4. In the case of the open-end bladder 20, the wall thickness is continuously changed so that the cross-sectional areas of cross sections aa, bb, and cc are the same.
上記のように、ブラダを上下クランプ部に近づ
くにしたがい肉厚を厚くして、上下方向各部にお
けるブラダ表面と直交する面で切断した場合の断
面積が略同一となるようにしているため、ブラダ
各部の応力が同じになり、ブラダの寿命を延長さ
せることができる。 As mentioned above, the wall thickness of the bladder increases as it approaches the upper and lower clamp parts, so that the cross-sectional area of each part in the vertical direction when cut along a plane perpendicular to the bladder surface is approximately the same. The stress in each part is the same, extending the life of the bladder.
特にラジアルタイヤではタイヤの品質向上のた
め、外径の大きなブラダを使用することが望まし
いが、ブラダを伸長するとき、従来のブラダで
は、断面積の小さい部分に大きな応力が発生し、
ブラダの寿命を短縮する原因となり、実用上、大
きな問題となつていたが、この問題点を解決する
ことができる。 Particularly for radial tires, it is desirable to use a bladder with a large outer diameter to improve the quality of the tire, but when the bladder is extended, with conventional bladders, large stress is generated in the part with a small cross-sectional area.
This has caused a shortening of the lifespan of the bladder, which has been a major problem in practice, but this problem can be solved.
第１図及び第２図はそれぞれ従来のものを示す
断面図、第３図及び第４図は、それぞれ本発明の
実施例を示す断面図である。
１０，２０：ブラダ、１０ａ，１０ｂ，２０
ａ，２０ｂ：クランプ部。
FIGS. 1 and 2 are sectional views showing a conventional device, and FIGS. 3 and 4 are sectional views showing an embodiment of the present invention, respectively. 10, 20: Bladder, 10a, 10b, 20
a, 20b: Clamp part.
Claims (1)
上下クランプ部に近づくにしたがつて厚くして、
上下方向各部におけるブラダ表面と直交する面で
切断した場合の断面積が略同一となるようにした
ことを特徴とするタイヤ加硫機用ブラダ。1 The wall thickness of the part of the bladder excluding the clamp part is
The closer you get to the upper and lower clamps, the thicker it becomes.
1. A bladder for a tire vulcanizer, characterized in that the cross-sectional area of each part in the vertical direction when cut along a plane orthogonal to the bladder surface is approximately the same.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10802580A JPS5732932A (en) | 1980-08-06 | 1980-08-06 | Bladder for tire vulcanizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10802580A JPS5732932A (en) | 1980-08-06 | 1980-08-06 | Bladder for tire vulcanizer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5732932A JPS5732932A (en) | 1982-02-22 |
| JPS6156084B2 true JPS6156084B2 (en) | 1986-12-01 |
Family
ID=14474055
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10802580A Granted JPS5732932A (en) | 1980-08-06 | 1980-08-06 | Bladder for tire vulcanizer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5732932A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6440581U (en) * | 1987-08-31 | 1989-03-10 |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4776781A (en) * | 1987-10-06 | 1988-10-11 | Bridgestone Corporation | Open-end bladder for vulcanization of pneumatic tire |
| KR20030020583A (en) * | 2001-09-03 | 2003-03-10 | 금호산업 주식회사 | Curer for T.B-Radial Tires and Curing Method |
| KR20030020582A (en) * | 2001-09-03 | 2003-03-10 | 금호산업 주식회사 | Curer for P.C-Radial Tires and Curing Method |
| KR100509730B1 (en) * | 2002-10-25 | 2005-08-25 | 금호타이어 주식회사 | Thin bladder for curing tire |
| US7144236B2 (en) | 2004-08-23 | 2006-12-05 | The Goodyear Tire & Rubber Company | Tire curing bladder |
| US8057204B2 (en) | 2007-12-20 | 2011-11-15 | The Goodyear Tire & Rubber Company | Tire curing bladder |
-
1980
- 1980-08-06 JP JP10802580A patent/JPS5732932A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6440581U (en) * | 1987-08-31 | 1989-03-10 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5732932A (en) | 1982-02-22 |
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