JPH02279743A - Pneumatic tire - Google Patents
Pneumatic tireInfo
- Publication number
- JPH02279743A JPH02279743A JP1099204A JP9920489A JPH02279743A JP H02279743 A JPH02279743 A JP H02279743A JP 1099204 A JP1099204 A JP 1099204A JP 9920489 A JP9920489 A JP 9920489A JP H02279743 A JPH02279743 A JP H02279743A
- Authority
- JP
- Japan
- Prior art keywords
- rubber
- tread
- sea
- braking
- 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.)
- Granted
Links
- 229920001971 elastomer Polymers 0.000 claims abstract description 80
- 239000005060 rubber Substances 0.000 claims abstract description 80
- 239000004636 vulcanized rubber Substances 0.000 claims abstract description 15
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 11
- 239000000843 powder Substances 0.000 claims description 15
- 150000001875 compounds Chemical class 0.000 claims description 4
- 238000013329 compounding Methods 0.000 claims description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims 1
- 229910052717 sulfur Inorganic materials 0.000 claims 1
- 239000011593 sulfur Substances 0.000 claims 1
- 239000002245 particle Substances 0.000 abstract description 8
- 238000005299 abrasion Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 description 17
- 238000012360 testing method Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 7
- 238000002156 mixing Methods 0.000 description 7
- 230000007423 decrease Effects 0.000 description 6
- 239000006260 foam Substances 0.000 description 6
- 238000005187 foaming Methods 0.000 description 6
- 229920000642 polymer Polymers 0.000 description 5
- 239000000203 mixture Substances 0.000 description 3
- 230000003746 surface roughness Effects 0.000 description 3
- 239000004604 Blowing Agent Substances 0.000 description 2
- 229920001875 Ebonite Polymers 0.000 description 2
- 244000043261 Hevea brasiliensis Species 0.000 description 2
- 239000011324 bead Substances 0.000 description 2
- 229920005549 butyl rubber Polymers 0.000 description 2
- 239000006229 carbon black Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 230000009477 glass transition Effects 0.000 description 2
- 229920003052 natural elastomer Polymers 0.000 description 2
- 229920001194 natural rubber Polymers 0.000 description 2
- 229920002857 polybutadiene Polymers 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 230000002393 scratching effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Tyre Moulding (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Tires In General (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は空気入りタイヤ、例えば湿潤路面および氷雪路
面を四季にわたって走行する乗用車およびトラック・バ
ス用等の空気入りタイヤに関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a pneumatic tire, for example, a pneumatic tire for use in passenger cars, trucks, buses, etc., which run on wet roads and icy and snowy roads in all seasons.
（従来の技術）
一般に、氷雪路用の空気入りタイヤは、氷雪路面上を走
行する際の駆動性、制動性および操縦性（以下、単に氷
雪性能という）を確保し、かつスパイクビンによる粉塵
公害や路面の損傷を防止するために、スパイクビンを用
いないスタ・ンドレスタイヤが広く用いられている。(Prior art) In general, pneumatic tires for icy and snowy roads ensure driving performance, braking performance, and maneuverability (hereinafter simply referred to as icing and snow performance) when driving on icy and snowy roads, and also reduce dust pollution caused by spike bins. In order to prevent damage to tires and road surfaces, standless tires that do not use spike bins are widely used.
従来のスタッドレス空気入りタイヤは、氷雪性能を改良
するため、低温におけるトレッドゴムの硬度を下げる方
法がとられている。具体的には、文献：ジャーナル・オ
ン・アイアールアイ、１９７２年発行、１０月号、１９
２頁、ザ フリクシラン オン ポリマー オン アイ
ス（Ｊｏｕｒｎａｌ ｏｒ ＩＲＩ丁ｈｅ Ｆｒ１ｃｔ
ｉｏｎ ｏｆ Ｐｏｌｙｍｅｒ ｏｎ Ｉｃｅ）著者−
、Ｆ、Ｎｏｒｉｃｈおよび文献：ザ フリクション オ
ブ ニューマチック タイヤ（Ｔｈｅ Ｆｒ１ｃｔｉｏ
ｎ ｏｆ ＰｎｅｕｍａｔｉｃＴｉｒｅｓ ） 、１９
７５年発行、にみられる様に天然ゴムまたはポリブタジ
ェンゴム等比較的ガラス転移点の低いポリマーを使用す
ることで、氷雪路面上の路面把握力の向上を図っている
。In order to improve the ice and snow performance of conventional studless pneumatic tires, a method is used to reduce the hardness of the tread rubber at low temperatures. Specifically, literature: Journal on IR, published in 1972, October issue, 19
Page 2, The Frixilan on Polymer on Ice
ion of Polymer on Ice) Author-
, F. Norich and literature: The Friction of Pneumatic Tires
n of Pneumatic Tires), 19
As seen in 1975, the use of polymers with relatively low glass transition points, such as natural rubber or polybutadiene rubber, is intended to improve road grip on icy and snowy roads.
（発明が解決しようとする課題）
しかしながら、天然ゴムまたはポリブタジェンゴム等の
ポリマーをトレッドゴムに用いる従来の方法によると、
ポリマー自体の正接損失（ｔａｎδ）が小さいため、湿
潤路面における制動性能が低下するという問題点がある
。(Problems to be Solved by the Invention) However, according to the conventional method of using polymers such as natural rubber or polybutadiene rubber for tread rubber,
Since the tangent loss (tan δ) of the polymer itself is small, there is a problem in that braking performance on wet road surfaces deteriorates.
また、トレッドゴムの正接損失（ｔａｎ δ）を大きく
するために、カーボンブラックを多量に使用する方法は
文献；ラバー ケミストリー アンドテクノロジー（Ｒ
ｕｂｂｅｒ Ｃｈｍｉｓｔｒｙ ａｎｄ Ｔｅｃｈｎｏ
ｌｏｇｙ）１９７５年発行、３８巻、５２７〜５３７頁
によって知られている。また、特公昭５７−５９２５６
号公報によれば、正接損失（ｔａｎδ）の大きいブチル
ゴムをトレ・ンドゴムに混合する方法も開示されている
。しかしながら、カーボンブラックを多量に配合するこ
とは、低温および室温付近でもゴムの硬度が硬くなり、
また、ブチルゴムをトレッドゴムに混合することは、ガ
ラス転移点を高くする。したがって、いずれの方法にお
いても、氷雪路面上を走行する際の駆動性および制動性
を低下させるという問題点がある。In addition, a method of using a large amount of carbon black in order to increase the tangent loss (tan δ) of tread rubber is described in the literature; Rubber Chemistry and Technology (R
Uber Chmistry and Techno
38, pp. 527-537, published in 1975. Also, special public service 57-59256
According to the publication, a method is also disclosed in which a butyl rubber having a large tangent loss (tan δ) is mixed with a trend rubber. However, adding a large amount of carbon black increases the hardness of the rubber even at low temperatures and around room temperature.
Also, mixing butyl rubber with tread rubber increases the glass transition point. Therefore, in either method, there is a problem in that driving performance and braking performance are reduced when driving on an icy and snowy road surface.
そこで、本発明の目的は、湿潤路面における制動性能を
損うことなく耐摩耗性が充分に実用に耐え、しかも氷雪
路面上における駆動性、制動性および操縦性を著しく改
良した空気入りタイヤを提供することにある。SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a pneumatic tire that has sufficient wear resistance for practical use without impairing braking performance on wet road surfaces, and that has significantly improved driving performance, braking performance, and maneuverability on icy and snowy roads. It's about doing.
（課題を解決するための手段）
本発明者らは、氷雪路面上における走行性能、特に駆動
性、制動性が減少するＯ″ＣＣ付近氷上、雪上において
、ゴムの表面粗さが氷上における摩擦係数に大きく影響
を与えることを見い出し、先に、独立気泡を含有する発
泡ゴムのタイヤトレッドゴムへの適用につき提案した。(Means for Solving the Problems) The present inventors have discovered that on ice and snow, the surface roughness of rubber is the coefficient of friction on ice near O''CC where driving performance and braking performance are reduced, especially on icy and snowy roads. We first proposed the application of foamed rubber containing closed cells to tire tread rubber.
しかしながら、発泡ゴムは耐摩耗性が充分でなく、汎用
サマータイヤおよび従来のオールシーズンタイヤの耐摩
耗性レベルまでは達していない。However, foamed rubber does not have sufficient wear resistance, and does not reach the level of wear resistance of general-purpose summer tires and conventional all-season tires.
本発明者らは、上述の発泡ゴムの利点を最大限活かすべ
く、また欠点を最少限にすべく研究を重ねた結果、上述
の発泡ゴムを、加硫発泡径粒径１０〜２０００μｍに粉
砕し、未加硫トレッドゴムに加えて加硫し、トレッドゴ
ム中に散在させると、発泡ゴム本来の高い摩擦係数に基
づく高い駆動性、制動性を示すと同時に、耐摩耗性の低
下もほとんど見られず、実用上問題ないことを見出した
。As a result of repeated research in order to maximize the advantages of the above-mentioned foamed rubber and minimize its drawbacks, the inventors of the present invention have pulverized the above-mentioned foamed rubber into vulcanized foam particles with a particle size of 10 to 2000 μm. When it is vulcanized in addition to unvulcanized tread rubber and dispersed in the tread rubber, it exhibits high driveability and braking performance based on the high friction coefficient inherent to foamed rubber, and at the same time shows almost no decrease in wear resistance. It was found that there was no problem in practical use.
尚、加硫粉末ゴムをトレッドゴム中に散在させる手法に
ついては、軟ゴム加硫物を混入する手法について特開昭
６３−９２６５９号公報および特開昭６３−１７２７５
０号公報に、また硬ゴムを混入する手法について特開昭
６０−１３９５０３号公報に概に開示されている。しか
し、本発明者らの研究によれば、トレッドゴム（海ゴム
）中に散在する加硫粉末ゴム（島ゴム）自身の高い摩擦
係数の効果を期待する場合、単に軟ゴム加硫物を混入す
るよりも、それ自身の摩擦係数の大きい発泡ゴムを混入
する方がその効果が著しく大きく、また島ゴムの引っ掻
き効果を期待して混入する硬ゴムの効果よりも、発泡ゴ
ムの表面粗さによる摩擦効果の方が大きいことを見い出
した。これらの知見に基づき、さらに鋭意検討を重ねた
結果本発明に到達した。Regarding the method of dispersing vulcanized powder rubber in the tread rubber, the method of mixing soft rubber vulcanizate is described in JP-A-63-92659 and JP-A-63-17275.
No. 0, and Japanese Patent Application Laid-open No. 139503/1983 generally discloses a method of mixing hard rubber. However, according to the research of the present inventors, if the effect of the high friction coefficient of the vulcanized powder rubber (island rubber) itself scattered in the tread rubber (sea rubber) is expected, simply mixing soft rubber vulcanizate The effect is significantly greater when foamed rubber, which has a high friction coefficient of its own, is mixed in than when the rubber is mixed in. Also, the effect is due to the surface roughness of the foamed rubber rather than the effect of hard rubber, which is mixed in with the expectation of the scratching effect of the island rubber. It was found that the frictional effect is greater. Based on these findings, the present invention was arrived at as a result of further intensive studies.
すなわち本発明は、タイヤのケースと、ケースのクラウ
ン部とを被覆するトレッドとを備えた空気入りタイヤに
おいて、トレッドがトレッド表部側にトレッドの全体積
の少なくとも１０％以上の体積を有する補強ゴム層を備
え、該補強ゴム層が海ゴム部と、下記、
（１）発泡率 １〜１００％
発泡径 ５〜２００μｍ
（２）粉末粒径 １０〜２０００μｍ
の要件を満足する発泡粉末加硫ゴムから形成された多数
の島ゴム部とから形成され、島ゴム部の発泡粉末加硫ゴ
ムが海ゴム部のゴム成分１００重量部に対し、５〜６０
重量配合されてなることを特徴とする空気入りタイヤに
関するものである。That is, the present invention provides a pneumatic tire comprising a tire case and a tread covering a crown portion of the case, in which the tread is provided with a reinforcing rubber having a volume of at least 10% or more of the total volume of the tread on the tread surface side. The reinforcing rubber layer is made of foamed powder vulcanized rubber that satisfies the following requirements: (1) foaming rate: 1 to 100%, foam diameter: 5 to 200 μm, and (2) powder particle size: 10 to 2000 μm. The foamed powder vulcanized rubber of the island rubber part is 5 to 60 parts by weight per 100 parts by weight of the rubber component of the sea rubber part.
The present invention relates to a pneumatic tire characterized by weight compounding.
（作 用）
海ゴム中に混入する島ゴムとしての発泡粉末加硫ゴムの
発泡率は１〜１００％の範囲内であることを要し、好ま
しくは５〜５０％の範囲内である。発泡率が１％未満で
は発泡状態が不充分で、摩擦係数に対する効果が認めら
れず、また１００％を超えると破壊強度の低下が著しく
、適切でない。(Function) The foaming rate of the foamed powder vulcanized rubber as the island rubber mixed in the sea rubber must be within the range of 1 to 100%, preferably within the range of 5 to 50%. If the foaming rate is less than 1%, the foamed state is insufficient and no effect on the coefficient of friction is observed, and if it exceeds 100%, the breaking strength will drop significantly, which is not appropriate.
また、かかる発泡粉末加硫ゴムの発泡径は５〜２００μ
ｍの範囲内であることを要し、好ましくは３０〜２００
μｍの範囲内である。発泡径が５μｍ未満では、表面粗
さが不充分で充分な摩擦係数が得られず、また２００μ
ｍを超えると破壊強度の低下により、摩擦効果が低下す
る。In addition, the foam diameter of such foamed powder vulcanized rubber is 5 to 200μ.
m, preferably within the range of 30 to 200
It is within the range of μm. If the foam diameter is less than 5 μm, the surface roughness will be insufficient and a sufficient friction coefficient will not be obtained;
If it exceeds m, the frictional effect will decrease due to a decrease in fracture strength.
発泡粉末加硫ゴムの粒径としては、１０〜２０００μｍ
の範囲内であることを要し、好ましくは１００〜１００
０μｍである。粒径が１０μｍ未満では発泡径・より小
さく、単に通常の加硫ゴム粉砕物を混入した効果と同じ
程度の効果しか得られない。一方、２０００μｍを超え
るとトレッドゴムの破壊強度、耐摩耗性を著しく低下さ
せるので好ましくない。The particle size of foamed powder vulcanized rubber is 10 to 2000 μm.
It must be within the range of 100 to 100, preferably 100 to 100
It is 0 μm. If the particle size is less than 10 μm, the foamed size will be smaller and the effect will be the same as that obtained by simply mixing ordinary pulverized vulcanized rubber. On the other hand, if it exceeds 2000 μm, it is not preferable because it significantly reduces the breaking strength and wear resistance of the tread rubber.
また、島ゴムとしての発泡粉末加硫ゴムの配合量は、海
ゴム部のゴム成分１００重量部に対し５〜６０重量部の
範囲内であることを要する。配合量が５重量部未満では
本発明の効果が少なく、また６０重量部よりも多く混入
すると、摩擦効果に比して耐摩耗性の低下が大きくなっ
てくる。Further, the amount of foamed powder vulcanized rubber as the island rubber needs to be within the range of 5 to 60 parts by weight per 100 parts by weight of the rubber component of the sea rubber part. If the amount is less than 5 parts by weight, the effect of the present invention will be small, and if it is more than 60 parts by weight, the abrasion resistance will deteriorate more than the friction effect.
（実施例） 以下本発明を実施例に基づき説明する。(Example) The present invention will be explained below based on examples.
まず、構成について説明する。第１図において、空気入
りラジアルタイヤ（タイヤサイズ１６５５Ｒ１３）ｌは
タイヤのケース２と、補強ゴム層からなりケース２のク
ラウン部２ａを被覆するトレッド３と、を有している。First, the configuration will be explained. In FIG. 1, a pneumatic radial tire (tire size 1655R13) 1 has a tire case 2 and a tread 3 made of a reinforcing rubber layer and covering a crown portion 2a of the case 2.
ケース２は、一対のビード部５と、ビード部５間にほぼ
放射方向に配置したゴム引きコードからなるカーカス部
６とカーカス部６のクラウン部にほぼタイヤ円周方向に
配置したベルト部７およびカーカス部のタイヤ軸方向両
側部を被覆するサイドウオールゴム８とから構成されて
いる。The case 2 includes a pair of bead portions 5, a carcass portion 6 consisting of a rubberized cord disposed approximately radially between the bead portions 5, and a belt portion 7 disposed approximately in the circumferential direction of the tire at the crown portion of the carcass portion 6. It is composed of sidewall rubber 8 that covers both sides of the carcass portion in the tire axial direction.
トレッド３はトレッド３の表部３ａ側で両ショルダ部間
に補強ゴム層１０を有し、補強ゴム層ｌＯはトレッド３
の全体積■の少なくとも１０％以上の体積を有し、この
実施例ではトレ・シトの全体積■と同じ１００％の体積
である。補強ゴム層ｌＯは海ゴム部１１と、海ゴム部１
１に周囲を囲まれ海ゴム部１１内に不均質状に散在する
多数の島ゴム部（図には白い多角形印にして示している
）１２とから形成されている。The tread 3 has a reinforcing rubber layer 10 between both shoulder parts on the front part 3a side of the tread 3, and the reinforcing rubber layer 10 is attached to the tread 3.
It has a volume that is at least 10% of the total volume (2) of , and in this example, the volume is 100%, which is the same as the total volume (2) of Tre Cito. The reinforcing rubber layer IO has a sea rubber part 11 and a sea rubber part 1.
1 and a large number of island rubber parts 12 (indicated by white polygonal marks in the figure) scattered in a non-uniform manner within the sea rubber part 11.
島ゴム部として使用した発泡ゴム組成物の配合割合（重
量部）を下記の第１表に示す。第１表において、発泡剤
以外の配合薬品はＦを除いて同一とし、発泡剤種および
配合量により発泡率、発泡径を変化させた。また配合物
Ｆは、比較の為に発泡しない純ゴム配合物とした。Ａ−
Ｆの配合物は通常に加硫させた後、冷凍粉砕などの通常
の手法により粉砕して、夫々第１表に示す粒径の粉末加
硫ゴムを作成した。The blending ratio (parts by weight) of the foamed rubber composition used as the island rubber part is shown in Table 1 below. In Table 1, the compounded chemicals other than the blowing agent were the same except for F, and the foaming rate and foam diameter were varied depending on the type and amount of the blowing agent. Compound F was a pure rubber compound that did not foam for comparison. A-
The compound F was vulcanized in the usual way and then pulverized by a usual method such as freeze pulverization to produce powdered vulcanized rubbers having the particle sizes shown in Table 1.
１」−１
海ゴム部にいては下記の第２表に示すように発泡粉末加
硫ゴムの添加の有無またその種類によらず、すべて同一
配合（重量部）のものを用いた。1''-1 As shown in Table 2 below, the same formulation (parts by weight) was used for the sea rubber portion, regardless of whether foamed powder vulcanized rubber was added or not, and regardless of its type.
試験に供したタイヤのトレッドは、第２表に示す海ゴム
部のゴム組成物に、第１表に示す夫々の粉末加硫ゴムを
加え、通常のトレッドゴムの製造方法によって混合し、
押し成形して未加硫トレッドゴムを製造した。このトレ
ッドを通常の方法により成型加硫し、試験タイヤを製造
した。製造した試験タイヤは、下記の方法により、氷上
制動性能（温度Ｏ″Ｃ）およびトレッドゴムの摩耗性能
につき試験した。The tread of the tire subjected to the test was prepared by adding each powdered vulcanized rubber shown in Table 1 to the rubber composition of the sea rubber part shown in Table 2, and mixing them according to a normal tread rubber manufacturing method.
An unvulcanized tread rubber was produced by pressing. This tread was molded and vulcanized using a conventional method to produce a test tire. The manufactured test tires were tested for on-ice braking performance (temperature O''C) and tread rubber wear performance using the following methods.
（試験法）
（１）氷上制動性能
各試験タイヤ４本を排気量１５００ｃｃの乗用車に装着
し、水面温度Ｏ″Ｃにおいて制動距離を測定した。(Test method) (1) Braking performance on ice Four test tires of each type were mounted on a passenger car with a displacement of 1500 cc, and the braking distance was measured at a water surface temperature of O''C.
結果は比較例１のタイヤを１００とした指数表示で表わ
し、数値が大きいほど制動が良好であることを示す。The results are expressed as an index with the tire of Comparative Example 1 set as 100, and the larger the value, the better the braking.
（２）トレッドゴムの摩耗性能
試験タイヤのトレッドゴム補強層から所定の形状の試料
を打出し、通常のランボーン摩耗試験機により所定の試
験条件で行い、比較例１の結果を１００として指数表示
した。数値は大きい程良好であることを示す。(2) Tread rubber abrasion performance test A sample of a predetermined shape was punched out from the tread rubber reinforcing layer of a tire, and tested under predetermined test conditions using an ordinary Lambourn abrasion tester, and the results of Comparative Example 1 were set as 100 and expressed as an index. . The larger the value, the better.
試験結果を第２表に併記する。The test results are also listed in Table 2.
第２表に示す各試験結果より、下記の効果が確認された
。From the test results shown in Table 2, the following effects were confirmed.
実施例１〜４および比較例１の試験結果から、加えた発
泡粉末加硫ゴムが本発明に係るものであれば、この粉末
ゴムの種類にかかわらず、氷上制動性能を大幅に向上す
ることができることが分かる。From the test results of Examples 1 to 4 and Comparative Example 1, if the foamed powdered vulcanized rubber added is according to the present invention, the braking performance on ice can be significantly improved regardless of the type of powdered rubber. I know what I can do.
また、これら実施例と比較例６の試験結果から、発泡粉
末ゴムの氷上制動性能向上効果は、純ゴム粉末加硫ゴム
（、未発泡）に比べて優れ、かつ摩耗性能の点でも大き
く向上していることが分かる。Furthermore, from the test results of these Examples and Comparative Example 6, the effect of foamed powder rubber on improving braking performance on ice is superior to that of pure rubber powder vulcanized rubber (unfoamed), and the wear performance is also greatly improved. I can see that
実施例３と比較例２の結果より、発泡ゴムの発泡率およ
び発泡径が本発明で規定する範囲を超えると、氷上制動
性能の効果に比して、摩耗性能の低下が大きくなること
が分かる。From the results of Example 3 and Comparative Example 2, it can be seen that when the foaming rate and foaming diameter of the foamed rubber exceed the range specified by the present invention, the wear performance decreases more than the effect of on-ice braking performance. .
実施例１と比較例３の結果より、粉末ゴムの粒径が２０
００μｍを超えると、著しい耐摩耗性能の低下が見られ
る。From the results of Example 1 and Comparative Example 3, the particle size of the powdered rubber was 20
When it exceeds 00 μm, a significant decrease in wear resistance is observed.
実施例Ｉと比較例４．５の結果より、発泡粉末ゴムの配
合部数が５ ｐｈｒ以下では、氷上制動性能に対する効
果が認められず、またあまりに多量に配合すると、氷上
制動性能に対する効果の割に、耐摩耗性能の低下が顕著
になってくることが分かる。From the results of Example I and Comparative Example 4.5, if the number of foamed powder rubber blended is 5 phr or less, there is no effect on the braking performance on ice, and if it is blended in too large a quantity, the effect on the braking performance on ice is less than 5 phr. , it can be seen that the decline in wear resistance performance becomes remarkable.
尚、第２表中の実施例１〜４の各試験タイヤは、湿潤路
面における制動性能は充分であり、かつ氷雪性能も充分
であった。また、トレッドゴムの摩耗性能は充分実用で
きる範囲である。The test tires of Examples 1 to 4 in Table 2 had sufficient braking performance on wet road surfaces and sufficient performance on ice and snow. Further, the wear performance of the tread rubber is within a sufficiently practical range.
前述の実施例は乗用車空気入りラジアルタイヤの場合に
ついて説明したが、本発明はこの実施例に限らず、トラ
ック・バス用、軽トラック周環空気入りラジアルタイヤ
、その他空気入りタイヤであってもよい。また、本発明
に供したトレッドゴム補強層は、更生タイヤ用トレッド
として用いても、充分本発明の効果を奏し得る。Although the above-mentioned embodiment has been described in the case of a pneumatic radial tire for a passenger car, the present invention is not limited to this embodiment, and may be applied to a pneumatic radial tire for trucks and buses, a circumferential pneumatic radial tire for light trucks, and other pneumatic tires. . Further, the tread rubber reinforcing layer according to the present invention can sufficiently exhibit the effects of the present invention even when used as a tread for a retreaded tire.
（発明の効果）
以上、説明したように本発明の空気入りタイヤにおいて
は、湿潤路面における制動性能を損うことなく、耐摩耗
性能が充分に実用に耐え、氷雪路面上における制動性・
駆動性および操縦性を著しく改良することができる。(Effects of the Invention) As explained above, in the pneumatic tire of the present invention, the wear resistance performance is sufficient for practical use without impairing the braking performance on wet road surfaces, and the braking performance and
Drivability and maneuverability can be significantly improved.
第１図は本発明の一例空気入りタイヤの一部断面図であ
る。FIG. 1 is a partial sectional view of a pneumatic tire as an example of the present invention.
Claims (1)
るトレッドとを備えた空気入りタイヤにおいて、 トレッドがトレッド表部側にトレッドの全体積の少なく
とも１０％以上の体積を有する補強ゴム層を備え、該補
強ゴム層が海ゴム部と、下記、 （１）発泡率１〜１００％ 発泡径５〜２００μｍ （２）粉末粒径１０〜２０００μｍ の要件を満足する発泡粉末加硫ゴムから形成された多数
の島ゴム部とから形成され、島ゴム部の発泡粉末加硫ゴ
ムが海ゴム部のゴム成分１００重量部に対し、５〜６０
重量配合されてなることを特徴とする空気入りタイヤ。[Claims] 1. A pneumatic tire comprising a tire case and a tread covering a crown portion of the case, wherein the tread has a volume on the tread surface side that is at least 10% or more of the total volume of the tread. The reinforcing rubber layer has a sea rubber part and a foamed powder compound that satisfies the following requirements: It is formed from a large number of island rubber parts made of sulfur rubber, and the foamed powder vulcanized rubber of the island rubber part is 5 to 60 parts by weight per 100 parts by weight of the rubber component of the sea rubber part.
A pneumatic tire characterized by weight compounding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1099204A JP2662294B2 (en) | 1989-04-19 | 1989-04-19 | Pneumatic tire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1099204A JP2662294B2 (en) | 1989-04-19 | 1989-04-19 | Pneumatic tire |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02279743A true JPH02279743A (en) | 1990-11-15 |
| JP2662294B2 JP2662294B2 (en) | 1997-10-08 |
Family
ID=14241122
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1099204A Expired - Fee Related JP2662294B2 (en) | 1989-04-19 | 1989-04-19 | Pneumatic tire |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2662294B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04170449A (en) * | 1990-11-01 | 1992-06-18 | Sumitomo Rubber Ind Ltd | Rubber composition |
| JP2007031521A (en) * | 2005-07-25 | 2007-02-08 | Toyo Tire & Rubber Co Ltd | Tread rubber composition and pneumatic tire |
| JP2018123209A (en) * | 2017-01-31 | 2018-08-09 | 横浜ゴム株式会社 | Studless tire rubber composition |
-
1989
- 1989-04-19 JP JP1099204A patent/JP2662294B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04170449A (en) * | 1990-11-01 | 1992-06-18 | Sumitomo Rubber Ind Ltd | Rubber composition |
| JP2007031521A (en) * | 2005-07-25 | 2007-02-08 | Toyo Tire & Rubber Co Ltd | Tread rubber composition and pneumatic tire |
| JP2018123209A (en) * | 2017-01-31 | 2018-08-09 | 横浜ゴム株式会社 | Studless tire rubber composition |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2662294B2 (en) | 1997-10-08 |
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