JPH10902A - Pneumatic tire for heavy load - Google Patents

Pneumatic tire for heavy load

Info

Publication number
JPH10902A
JPH10902A JP8154026A JP15402696A JPH10902A JP H10902 A JPH10902 A JP H10902A JP 8154026 A JP8154026 A JP 8154026A JP 15402696 A JP15402696 A JP 15402696A JP H10902 A JPH10902 A JP H10902A
Authority
JP
Japan
Prior art keywords
chafer
rubber
traveling
elongation
breakage
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.)
Granted
Application number
JP8154026A
Other languages
Japanese (ja)
Other versions
JP3723281B2 (en
Inventor
Shuichi Watanabe
修一 渡辺
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 JP15402696A priority Critical patent/JP3723281B2/en
Publication of JPH10902A publication Critical patent/JPH10902A/en
Application granted granted Critical
Publication of JP3723281B2 publication Critical patent/JP3723281B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Tires In General (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a tire using a cheap chafer rubber excellent in heat resistance by setting to a specific condition value or more a hardness at a high temperature and an elongation at the time of breakage after traveling as to the physical property of the chafer rubber used in a rubber chafer part the chafer rubber. SOLUTION: In order that the physical property of the chafer rubber used in a rubber chafer part can endure a severe usage condition where temperature reaches a high temperature of 150 deg.C, the hardness thereof at a high temperature is specified so that 100% modulus at 150 deg.C is 40kg/cm<2> and more. Furthermore, since the chafer rubber is hardened by traveling as well as by deterioration it may happen that the toe part may become defective when an elongation at the time of breakage after traveling comes to a certain value or less. Consequently, even when the modulus is heightened, it is required that the elongation (Eb) at the time of breakage after traveling is secured to be a certain value or more. Eb after again of 100 deg.C×24h in air is specified as 200% or more. As a consequence, it becomes possible to suppress burst trouble and toe defect in city buses or the like where the brake heat becomes high.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は、重荷重用空気入り
タイヤに関し、特に、市内バスのようなゴー・ストップ
が多い使用条件に好適な重荷重用空気入りタイヤに関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heavy-duty pneumatic tire, and more particularly to a heavy-duty pneumatic tire suitable for use conditions in which there are many go stops such as city buses.

【０００２】[0002]

【従来の技術】重荷重用空気入りタイヤを通常に使用す
る場合には、ゴムチェーファ部の温度上昇は、最高でも
１２０℃位までであるため、チェーファーゴムの熱軟化
によりプライコードが抜けてバーストを起こすような故
障を想定する必要はない。2. Description of the Related Art When a heavy-duty pneumatic tire is normally used, the temperature of the rubber chafer rises up to about 120 ° C. at the maximum. It is not necessary to assume a failure that would cause it.

【０００３】しかし、市内バスのようなゴー・ストップ
が多い使用条件では、ゴムチェーファー部の温度上昇
は、１４０℃位になり、また、１５０℃に達する場合
は、従来のチェーファーゴムでは熱軟化が激しくなっ
て、プライコードが抜けてバースト故障を生じる恐れが
ある。[0003] However, under use conditions such as city buses where there are many go stops, the temperature rise of the rubber chafer section is about 140 ° C. The heat softening may be so severe that the ply cord may come off, causing a burst failure.

【０００４】[0004]

【発明が解決しようとする課題】そこで、本発明は、耐
熱性の優れたチェーファーゴムを使用した重荷重用空気
入りタイヤを提供することを目的とする。SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a heavy duty pneumatic tire using chafer rubber having excellent heat resistance.

【０００５】[0005]

【課題を解決するための手段】上記目的を達成するた
め、本発明は以下の構成とする。即ち、ゴムチェーファ
ーを備えた重荷重用空気入りタイヤにおいて、前記チェ
ーファーゴムの、１５０℃における１００％モジュラス
が４０kg／cm2 以上であり、空気中で１００℃×２４時
間老化後における破断時の伸びが２００％以上であるこ
とを特徴とする。In order to achieve the above object, the present invention has the following arrangement. That is, in a heavy-duty pneumatic tire provided with a rubber chafer, the 100% modulus of the chafer rubber at 150 ° C. is 40 kg / cm 2 or more, and the rupture after aging in air at 100 ° C. × 24 hours. The elongation is at least 200%.

【０００６】[0006]

【発明の実施の形態】以下の本発明をより詳細に説明す
る。本発明では、チェーファーゴムの物性を規定するも
ので、１５０℃の高温に達する過酷な使用条件でも耐え
得るために、高温での硬さを、１５０℃における１００
％モジュラス（Ｍ）が４０kg／cm2 以上と規定する。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail below. In the present invention, the physical properties of the chafer rubber are specified. In order to withstand the harsh use conditions reaching a high temperature of 150 ° C., the hardness at the high temperature is set to 100% at 150 ° C.
The% modulus (M) is specified to be 40 kg / cm 2 or more.

【０００７】即ち、図１は、１５０℃の温度で、種々の
硬さをもつチェーファーゴムを備えたタイヤを試作し、
市内バス同等の走行条件以上の過酷な条件までテスト
し、それぞれのゴムについてバースト故障が発生する限
界温度を求めたものであるが、これによると、市内バス
同等の走行条件で最大に温度があがる１５０℃において
も耐えるためには、１５０℃での１００％モジュラスが
４０kg／cm2 以上必要であるとがわかる。That is, FIG. 1 shows a trial production of tires having chafer rubber having various hardnesses at a temperature of 150 ° C.
The test was conducted under severe conditions exceeding the running conditions equivalent to a city bus, and the limit temperature at which a burst failure occurred for each rubber was calculated. It can be seen that a 100% modulus at 150 ° C. is required to be 40 kg / cm 2 or more in order to withstand even 150 ° C.

【０００８】また、チェーファーゴムは、走行と共に劣
化により硬化するため、走行後に破断時の伸びがある値
を割ると、リム解／リム組み時に、トウ部が欠ける故障
に到ることがある。従って、モジュラスを高くしても、
走行後の破断時の伸び（Ｅｂ）はある値以上を確保する
必要があり、空気中で１００℃×２４時間老化後におけ
るＥｂが２００％以上と規定する。Further, since chafer rubber hardens due to deterioration during running, if the elongation at break after running is below a certain value, a failure may occur in which the toe portion is chipped when the rim is disassembled / assembled. Therefore, even if the modulus is increased,
The elongation at break (Eb) after running must be at least a certain value, and the Eb after aging in air at 100 ° C. for 24 hours is defined as 200% or more.

【０００９】即ち、図２は、実地の劣化を想定した１０
０℃×２４時間空気中での老化において、種々の破断時
伸びレベルをもつチェーファーゴムを備えたタイヤを試
作し、実地２０万Ｋｍ走行させた後、リム解きを実施
し、どの位の比率でトウ欠けが発生するかをテストした
ものであるが、これによると、１００℃×２４時間空気
中老化後のＥｂが２００％を下回ると、トウ欠け発生割
合が急激に高くなり、Ｅｂが２００％以上必要であるこ
とがわかる。[0009] That is, FIG.
After aging in air at 0 ° C. for 24 hours, prototype tires with chafer rubber having various elongation levels at break were prototyped, and after actual running of 200,000 km, the rim was unraveled. According to this test, if the Eb after aging in air at 100 ° C. for 24 hours is less than 200%, the rate of occurrence of tow chipping increases sharply and the Eb becomes 200%. % Is required.

【００１０】[0010]

【実施例】以下に本発明を実施例に基づいて説明する。
表１記載の配合に従って、通常の加硫条件で、チェーフ
ァーゴムを作製し、チェーファーゴムの、１００％モジ
ュラス（Ｍ）、破断強度（Ｔｂ）、および破断時の伸び
（Ｅｂ）をダンベル状試験片を用いて、ＪＩＳ Ｋ ６
３０１に準拠して測定した。結果は同じく表１に示す。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments.
According to the composition shown in Table 1, a chafer rubber was produced under ordinary vulcanization conditions, and the 100% modulus (M), breaking strength (Tb), and elongation at break (Eb) of the chafer rubber were dumbbell-shaped. Using a test piece, JIS K6
It was measured in accordance with No. 301. The results are also shown in Table 1.

【００１１】[0011]

【表１】 [Table 1]

【００１２】*１：Ｎ−（１，３−ジメチルブチル）−
Ｎ′−フェニル−ｐ−フェニレンジアミン *２：Ｎ−tert−ブチル−２−ベンゾチアゾリル−スル
フェンアミド *３：Ｎ，Ｎ′−ｍ−フェニレンジマレイミド （１）：室温にて測定した結果を示す （２）：１５０℃にて測定した結果を示す。 （３）：空気中に１００℃にて２４時間置いた後に測定
した結果を示す。* 1: N- (1,3-dimethylbutyl)-
N'-phenyl-p-phenylenediamine * 2: N-tert-butyl-2-benzothiazolyl-sulfenamide * 3: N, N'-m-phenylenedimaleimide (1): Results measured at room temperature (2): The result measured at 150 ° C. is shown. (3): The result measured after being placed in air at 100 ° C. for 24 hours is shown.

【００１３】上記結果より、架橋系をＳｅｍｉ- ＥＶ系
にした実施例１が、さらに、Ｃ−Ｃ結合を採用した実施
例２が、より好結果を示す。From the above results, Example 1 in which the cross-linking system is a Semi-EV system, and Example 2 in which a CC bond is employed show better results.

【００１４】[0014]

【発明の効果】以上説明したように、本発明によると、
重荷重用空気入りタイヤにおいて、特定の物性を有する
チェーファーゴムを使用すると、ゴー・ストップが多
く、ブレーキ熱が高くなる市内バス等においても、バー
スト故障、トウ欠けの発生を抑えることができる。As described above, according to the present invention,
When a chafer rubber having specific physical properties is used in a heavy-duty pneumatic tire, burst failure and toe chipping can be suppressed even in a city bus or the like where a lot of go stops and high brake heat are generated.

【図面の簡単な説明】[Brief description of the drawings]

【図１】１５０℃における１００％モジュラスと限界温
度との関係を示すグラフである。FIG. 1 is a graph showing a relationship between a 100% modulus at 150 ° C. and a limit temperature.

【図２】１００℃で２４時間老化させた場合のＥｂとト
ウ欠け発生率との関係を示すグラフである。FIG. 2 is a graph showing a relationship between Eb and tow chipping occurrence rate when aged at 100 ° C. for 24 hours.

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】 ゴムチェーファーを備えた重荷重用空気
入りタイヤにおいて、前記チェーファーゴムの、１５０
℃における１００％モジュラスが４０kg／cm 2 以上であ
り、空気中で１００℃×２４時間老化後における破断時
の伸びが２００％以上であることを特徴とする重荷重用
空気入りタイヤ。1. Heavy load air with a rubber chafer
In the case of the tire containing the chafer rubber, 150
100% modulus at 40 ° C is 40 kg / cm TwoIs over
At break after aging in air at 100 ℃ for 24 hours
For heavy loads, characterized by an elongation of 200% or more
Pneumatic tire.
JP15402696A 1996-06-14 1996-06-14 Pneumatic tire for city bus Expired - Lifetime JP3723281B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15402696A JP3723281B2 (en) 1996-06-14 1996-06-14 Pneumatic tire for city bus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15402696A JP3723281B2 (en) 1996-06-14 1996-06-14 Pneumatic tire for city bus

Publications (2)

Publication Number Publication Date
JPH10902A true JPH10902A (en) 1998-01-06
JP3723281B2 JP3723281B2 (en) 2005-12-07

Family

ID=15575290

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15402696A Expired - Lifetime JP3723281B2 (en) 1996-06-14 1996-06-14 Pneumatic tire for city bus

Country Status (1)

Country Link
JP (1) JP3723281B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002326508A (en) * 2001-05-01 2002-11-12 Bridgestone Corp Bead part structure of pneumatic tire
JP2006111767A (en) * 2004-10-15 2006-04-27 Yokohama Rubber Co Ltd:The Rubber composition and pneumatic tire using the same

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002326508A (en) * 2001-05-01 2002-11-12 Bridgestone Corp Bead part structure of pneumatic tire
JP4666802B2 (en) * 2001-05-01 2011-04-06 株式会社ブリヂストン Pneumatic tire bead structure
JP2006111767A (en) * 2004-10-15 2006-04-27 Yokohama Rubber Co Ltd:The Rubber composition and pneumatic tire using the same

Also Published As

Publication number Publication date
JP3723281B2 (en) 2005-12-07

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