JPH10138719A - Pneumatic radial tire furnished with side reinforcing layer and installation method of this tire - Google Patents
Pneumatic radial tire furnished with side reinforcing layer and installation method of this tireInfo
- Publication number
- JPH10138719A JPH10138719A JP8296293A JP29629396A JPH10138719A JP H10138719 A JPH10138719 A JP H10138719A JP 8296293 A JP8296293 A JP 8296293A JP 29629396 A JP29629396 A JP 29629396A JP H10138719 A JPH10138719 A JP H10138719A
- Authority
- JP
- Japan
- Prior art keywords
- radial tire
- reinforcing layer
- tire
- vehicle
- side reinforcing
- 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
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
- B60C19/00—Tyre parts or constructions not otherwise provided for
- B60C19/001—Tyres requiring an asymmetric or a special mounting
-
- 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
- B60C17/00—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor
- B60C17/0009—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor comprising sidewall rubber inserts, e.g. crescent shaped inserts
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tires In General (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、空気入りラジアル
タイヤに係り、特に、走行時にパンク等が発生した場合
に、該パンク状態のままで所定距離を継続走行可能な耐
久性のある三日月状補強層を備えた空気入りラジアルタ
イヤ、いわゆる、ランフラット・タイヤに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pneumatic radial tire, and more particularly, to a durable crescent-shaped reinforcement capable of continuously running a predetermined distance in a punctured state when a puncture or the like occurs during running. The invention relates to pneumatic radial tires with layers, so-called run-flat tires.
【０００２】[0002]
【従来の技術】従来から、自動車に装着される空気入り
ラジアルタイヤにおいては、該空気入りラジアルタイヤ
が走行中に、釘や金属片等の異物が突き刺ささる等の何
等かの原因で、内圧がさがったり、ゼロ状態になったり
する、いわゆる、タイヤがパンクをした際に、該タイヤ
の補修のために、自動車をサービスステーション等の望
む場所にタイヤのダメージや操舵の不具合なしに所定距
離移動すべく、安全に継続走行するための種々の構造上
の対策がなされている。2. Description of the Related Art Conventionally, in a pneumatic radial tire mounted on an automobile, when the pneumatic radial tire is running, the internal pressure is increased due to foreign matter such as nails or metal pieces piercing for some reason. When the tire is punctured, that is, falls or becomes zero, in order to repair the tire, the vehicle is moved to a desired place such as a service station or the like for a predetermined distance without any damage to the tire or trouble in steering. Therefore, various structural measures have been taken for safe and continuous traveling.
【０００３】例えば、乗用自動車用車両に装着される空
気入りラジアルタイヤとしては、タイヤ内の最も剛性が
低い部位であるサイドウオールのカーカス内周面に、三
日月状断面のゴム層を裏張りし、サイドウオール全体を
ほぼ均一な厚みにして剛性を付与した簡便で、実効ある
方策のサイド補強層を備えた空気入りラジアルタイヤ、
いわゆる、ランフラットタイヤが提案されている。該サ
イド補強層を備えたランフラットタイヤは、正常な状態
においては、荷重を主として内圧で支持し、パンク時に
は、補強されたサイドウォールの固有の剛性で荷重を肩
代わり支持するものである。[0003] For example, as a pneumatic radial tire mounted on a vehicle for a passenger car, a rubber layer having a crescent cross section is lined with an inner peripheral surface of a side wall carcass which is a portion having the lowest rigidity in the tire. A pneumatic radial tire with a side reinforcement layer that is a simple and effective measure that provides rigidity by making the entire sidewall almost uniform in thickness,
A so-called run flat tire has been proposed. In a normal state, the run flat tire provided with the side reinforcing layer mainly supports the load by the internal pressure, and at the time of puncture, supports the load by shoulder due to the inherent rigidity of the reinforced side wall.
【０００４】また、タイヤのパンク時の走行耐久性を向
上するためには、タイヤに前記の如きサイド補強層を備
え、該サイド補強層を形成しているエラストマーを増加
して前記サイド補強層の厚みを増加させるのが良いが、
厚みを増加させることによってタイヤ重量が増加すると
共に、操縦安定性能・乗り心地等も悪化する傾向があっ
て、結果としてタイヤの転がり抵抗が悪化するとの不具
合を生じる。前記不具合を解決すべく、前記サイド補強
層の形状を変形し、該サイド補強層のタイヤ内側のペリ
フェリーを三等分したときに、ラジアル方向外側の１／
３点における前記サイド補強層の断面厚さが、ラジアル
方向内側の１／３における前記サイド補強層の断面厚さ
の１．８ないし２．８倍であるようにし、タイヤの重量
の増加、及び、操縦安定性能・乗り心地性能等が悪化す
ることなしに、タイヤ走行時の耐久性を向上させたラン
フラット・タイヤも、本出願人において提案されている
（特願平８−１３５０３９号）。In order to improve the running durability of the tire during puncturing, the tire is provided with a side reinforcing layer as described above, and the elastomer forming the side reinforcing layer is increased to increase the side reinforcing layer. It is good to increase the thickness,
Increasing the thickness tends to increase the tire weight, and also tends to degrade steering stability, ride comfort, and the like. As a result, a problem arises in that the rolling resistance of the tire deteriorates. In order to solve the above problem, when the shape of the side reinforcing layer is deformed and the peripheries inside the tire of the side reinforcing layer are divided into three equal parts, 1/1 / radial outer side is obtained.
The cross-sectional thickness of the side reinforcing layer at three points is 1.8 to 2.8 times the cross-sectional thickness of the side reinforcing layer at 1/3 of the radially inner side, so that the weight of the tire increases, and Also, a run flat tire in which durability during tire running is improved without deteriorating steering stability performance and riding comfort performance has been proposed by the present applicant (Japanese Patent Application No. 8-135039).
【０００５】[0005]
【発明が解決しようとする課題】ところで、前記サイド
補強層を備えた空気入りラジアルタイヤ（ランフラット
・タイヤ）は、パンク等でタイヤの充填内圧が低下した
状態で、前記補強されたサイド部の剛性によって車両の
荷重を支えつつ、継続走行することを前提としているも
のであるから、タイヤに十分に空気が充填されている状
態で走行するのと比べれば、程度の差はともかくとし
て、タイヤの特定位置に偏荷重が作用してタイヤの特定
位置に歪を生じ、該歪位置がタイヤの故障の原因となっ
てしまうことが予想される。By the way, a pneumatic radial tire (run-flat tire) provided with the above-mentioned side reinforcing layer has a reinforced side portion in a state where the internal pressure of the tire is reduced due to puncture or the like. Since it is assumed that the vehicle will continue to run while supporting the load of the vehicle with rigidity, compared to running with the tires sufficiently filled with air, regardless of the degree of difference, It is expected that an eccentric load acts on a specific position to cause a distortion at a specific position of the tire, and the distorted position may cause a tire failure.
【０００６】そこで、実際に、車両にパンクした空気入
りラジアルタイヤを装着して、前記故障位置を受験的に
調べたところ、前輪の空気入りラジアルタイヤは、タイ
ヤ装着の外側位置にパンク走行時の故障が集中し、後輪
の空気入りラジアルタイヤは、タイヤ装着の内側部位に
パンク走行時の故障が集中していることが確認された。Therefore, when the punctured pneumatic radial tire was actually mounted on the vehicle and the above-mentioned failure position was examined by an examination, the pneumatic radial tire of the front wheel was located outside the tire mounting position during puncture. Failures were concentrated, and it was confirmed that failures during puncture running were concentrated on the inner part of the pneumatic radial tires mounted on the rear wheels.
【０００７】前記集中した故障は、空気入りラジアルタ
イヤの車両への装着（前輪もしくは後輪）の相違に基づ
いて、前記タイヤの特定部位に発生するものであるか
ら、空気入りラジアルタイヤに、パンク走行時用のサイ
ド補強層を設けるにあたっては、前記タイヤの車両への
装着の相違による集中故障をタイヤ全体の耐久性の面か
ら考慮しなければならないことが解った。[0007] The concentrated failure occurs at a specific portion of the pneumatic radial tire based on a difference in mounting of the pneumatic radial tire on a vehicle (front wheel or rear wheel). In providing the side reinforcing layer for running, it has been found that a concentrated failure due to a difference in the mounting of the tire on the vehicle must be considered from the viewpoint of the durability of the entire tire.
【０００８】本発明は、前記のような問題に鑑みてなさ
れたものであって、その目的とするところは、パンク時
の耐久性のためのサイド補強層を備えながら、その厚み
を抑えてタイヤ重量を軽減してタイヤの転がり抵抗を向
上させると共に、車両への装着位置に基づく集中故障を
軽減させる空気入りラジアルタイヤと該タイヤの車両へ
の装着方法を提供することである。The present invention has been made in view of the above-mentioned problems, and has as its object to reduce the thickness of a tire while providing a side reinforcing layer for durability during puncturing. An object of the present invention is to provide a pneumatic radial tire and a method of mounting the tire on a vehicle, which reduce the weight to improve the rolling resistance of the tire and reduce concentrated failure based on the mounting position on the vehicle.
【０００９】[0009]
【課題を解決するための手段】前記目的を達成すべく、
本発明に係る空気入りラジアルタイヤは、左右一対のビ
ート部に設けられたビートコアと、クラウン部から両サ
イド部を経て両ビート部に延び、該ビートコアに巻回さ
れてビート部に係留されたラジアルコード層よりなるカ
ーカスプライと、該カーカスプライのクラウン部のラジ
アル方向外側に配置され、実質的に非伸長性のコードを
被覆ゴム中に埋設して成るベルトと、該ベルトのラジア
ル方向外側に配置されたトレッドとを備え、前記カーカ
スプライの内面に沿って、両サイド部の全域にわたっ
て、子午断面が三日月状のサイド補強層を備えると共
に、特に、該サイド補強層が、左右のサイド部で厚みが
異なることを特徴としている。In order to achieve the above object,
A pneumatic radial tire according to the present invention includes a beat core provided in a pair of left and right beat portions, and a radial extending from the crown portion to both beat portions via both side portions, wound around the beat core and moored to the beat portion. A carcass ply comprising a cord layer, a belt disposed radially outside a crown portion of the carcass ply, and having a substantially inextensible cord embedded in a covering rubber; and a belt disposed radially outside the belt. Along the inner surface of the carcass ply, along the entire surface of both sides, a meridional cross section is provided with a crescent-shaped side reinforcing layer, and particularly, the side reinforcing layer has a thickness at the left and right side portions. Are different.
【００１０】前述の如く構成された本発明のサイド補強
層を備えた空気入りラジアルタイヤは、両サイド部の一
方に厚いサイド補強層を配置し、他方のサイド部に薄い
サイド補強層を配置したことで、パンク時の耐久走行性
能を従来例の両サイド部に厚い補強層を配置したラジア
ルタイヤとほぼ同じに維持すると共に、ラジアルタイヤ
の重量が軽減して転がり抵抗性能を向上させることがで
きる。In the pneumatic radial tire having the side reinforcing layer of the present invention configured as described above, a thick side reinforcing layer is disposed on one of both side portions, and a thin side reinforcing layer is disposed on the other side portion. By doing so, it is possible to maintain the durability running performance at the time of puncturing almost the same as the conventional radial tire in which the thick reinforcing layers are arranged on both sides, and reduce the weight of the radial tire to improve the rolling resistance performance. .
【００１１】また、本発明は、前記サイド補強層を備え
た空気入りラジアルタイヤの四輪車両への装着方法とし
て、前輪がサイド補強層の厚い側を車両の外側に位置し
て装着し、車両の後輪がサイド補強層の厚い側を車両の
内側に位置して装着することを特徴としている。The present invention also relates to a method of mounting a pneumatic radial tire having the side reinforcing layer on a four-wheeled vehicle, wherein the front wheel is mounted with the thick side of the side reinforcing layer positioned outside the vehicle. The rear wheel is mounted with the thick side of the side reinforcing layer positioned inside the vehicle.
【００１２】通常、四輪車両の前輪は、キャンバ角が付
けられ、後輪は、逆に、ネガテブキャンバ角が付けられ
ている。前輪は前記キャンパ角によって外側に荷重が移
動している状態になっているが、車両が走行してハンド
ルを操舵して操向すると、コーナーリング外側に更に荷
重が移動して集中する。この状態は前輪の外側の歪が増
大することを意味し、前輪のラジアルタイヤの外側に故
障が集中することになる。Normally, the front wheels of a four-wheel vehicle have a camber angle, and the rear wheels have a negative camber angle. The load on the front wheels is shifted outward due to the camper angle. However, when the vehicle is running and the steering wheel is steered, the load is further shifted and concentrated outside the cornering. This state means that the distortion outside the front wheel increases, and the failures are concentrated outside the radial tire of the front wheel.
【００１３】一方、後輪は、故障が車両の外側に集中す
ることはないが、後輪がネガテブキャンバ角が付されて
いるので、後輪のラジアルタイヤの車両内側に荷重の中
心があるようになり、後輪のラジアルタイヤの車両内側
に荷重が集中し、該車両内側部分に故障が集中する傾向
がある。On the other hand, the rear wheels do not concentrate on the outside of the vehicle, but since the rear wheels have a negative camber angle, the center of the load may be located inside the rear tire radial tire inside the vehicle. Therefore, the load tends to concentrate on the inside of the rear tire of the radial tire inside the vehicle, and the breakdown tends to concentrate on the inside of the vehicle.
【００１４】本発明の装着方法は、前記のようにラジア
ルタイヤを車両に装着することによって、タイヤパンク
走行時に、荷重が多くかかり故障が集中する前記部位
に、厚いサイド補強層を配置して走行することになるの
で、ラジアルタイヤの一方の側に薄いサイド補強層を配
置してその重量を軽減しているにも拘らず、ラジアルタ
イヤのパンク走行時の耐久性を維持し、転がり抵抗性能
を向上させることができる。According to the mounting method of the present invention, by mounting a radial tire on a vehicle as described above, a thick side reinforcing layer is arranged at the portion where a large load is applied and a breakdown is concentrated during tire puncture. Despite reducing the weight by placing a thin side reinforcing layer on one side of the radial tire, the durability of the radial tire during puncturing is maintained, and the rolling resistance performance is improved. Can be improved.
【００１５】[0015]
【発明の実施の形態】以下、本発明の一実施形態の空気
入りラジアルタイヤを図面に基づいて説明する。図１
は、本実施形態のサイド補強層を備えた空気入りラジア
ルタイヤ、いわゆる、ランフラット・タイヤ１０（以
下、単に、ラジアルタイヤと云う）の断面図であり、該
ラジアルタイヤ１０のサイズは、２７５／４０Ｒ１７で
ある。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A pneumatic radial tire according to an embodiment of the present invention will be described below with reference to the drawings. FIG.
1 is a cross-sectional view of a pneumatic radial tire provided with a side reinforcing layer of the present embodiment, that is, a so-called run-flat tire 10 (hereinafter, simply referred to as a radial tire). The size of the radial tire 10 is 275 / 40R17.
【００１６】図１に示すラジアルタイヤ１０は、断面ル
ープ状を呈し、全体がゴム層１１により形成され、断面
両端部のビート部１２、１２には、前記ラジアルタイヤ
１０の回転軸回りにリング状に形成された一対のビート
コア１３、１３が備えられている。これら一対のビート
コア１３、１３間には、前記ラジアルタイヤ１０の断面
方向にループ状に配置され、クラウン部Ａから左右の両
サイド部Ｂ1，Ｂ2に延びたプライコード１４から成る二
層のカーカスプライ１５が跨設されている。該カーカス
プライ１５の長手方向両端部１５’１５’は、一対の前
記ビートコア１３、１３の周りに外側に折り返して巻き
上げられている。The radial tire 10 shown in FIG. 1 has a loop shape in cross section, and is entirely formed by a rubber layer 11. Beat portions 12, 12 at both ends of the cross section have a ring shape around the rotation axis of the radial tire 10. Are provided. Between the pair of beat cores 13, two layers of ply cords 14 are arranged in a loop in the cross-sectional direction of the radial tire 10 and extend from the crown portion A to both left and right side portions B 1 and B 2 . A carcass ply 15 is straddled. Both ends 15 ′ 15 ′ in the longitudinal direction of the carcass ply 15 are turned outward around the pair of beat cores 13, 13 and wound up.
【００１７】前記クラウン部Ａのカーカスプライ１５の
ラジアル方向外側には、実質的に非伸長性のスチールコ
ード１６、・・・から成る三層のスチールベルト層１７が
前記被覆ゴム１１内に埋設配置され、該スチールベルト
層１７のラジアル方向外側には、前記ゴム１１から成る
肉厚のトレッド部１８が形成されている。該トレッド部
１８の表面部には、前記ラジアルタイヤの周方向に連続
に延びる複数のリブ溝（周方向溝）１９、・・・が幅方向
に所定間隔を置いて刻設されている。On the outer side of the carcass ply 15 in the crown portion A in the radial direction, a three-layer steel belt layer 17 composed of substantially inextensible steel cords 16,. A thick tread portion 18 made of the rubber 11 is formed radially outside the steel belt layer 17. On the surface of the tread portion 18, a plurality of rib grooves (circumferential grooves) 19,... Extending continuously in the circumferential direction of the radial tire are formed at predetermined intervals in the width direction.
【００１８】前記ラジアルタイヤ１０の前記カーカスプ
ライ１５の左右の両サイド部Ｂ1，Ｂ2の内面には、サイ
ド補強層２１、２２が形成されている。該サイド補強層
２１、２２は、前記左右の両サイド部Ｂ1，Ｂ2の各々の
内面の全域に渡って、子午断面が三日月状になるように
形成されており、左右の補強層２１、２２でその三日月
状の断面の厚さＴ（ｔ1、ｔ2）が異なるように形成され
ている。図１においては、左側のサイド補強層２１の断
面厚さｔ1が、右側のサイド補強層２２の断面厚さｔ2よ
り厚く形成されている。Side reinforcing layers 21 and 22 are formed on the inner surfaces of the left and right side portions B 1 and B 2 of the carcass ply 15 of the radial tire 10. The side reinforcing layers 21 and 22 are formed so as to have a crescent cross section in the meridional section over the entire inner surface of each of the left and right side portions B 1 and B 2 . At 22, the crescent-shaped cross sections have different thicknesses T (t 1 , t 2 ). In FIG. 1, the sectional thickness t 1 of the left side reinforcing layer 21 is formed larger than the sectional thickness t 2 of the right side reinforcing layer 22.
【００１９】前記の如く、本実施形態のラジアルタイヤ
１０は、前記カーカスプライ１５、１５の内面にそって
前記左右の両サイド部Ｂ1、Ｂ2の全域に渡って、子午断
面が三日月状のサイド補強層２１、２２を備えた構成と
したので、前記ラジアルタイヤを車両に装着し、該車両
を走行中に、パンク等によって前記ラジアルタイヤの内
圧が低下する状態になっても、前記サイド補強層２１、
２２で補強された前記左右の両サイド部Ｂ1、Ｂ2の剛性
によって、前記車両の荷重を支えて、前記ラジアルタイ
ヤ１０を継続して所定距離走行できる。もっとも、前記
サイド補強層２１、２２はその厚さを異にしているの
で、厚いサイド補強層２１を備えたサイド部Ｂ1の方が
薄い補強層２２を備えたサイド部Ｂ2よりも剛性があ
り、タイヤ耐久走行性が良いことになる。As described above, the radial tire 10 of the present embodiment has a crescent-shaped meridian section over the entire area of the left and right side portions B 1 and B 2 along the inner surfaces of the carcass plies 15 and 15. Since the radial tire is mounted on the vehicle and the internal pressure of the radial tire is reduced due to puncture while the vehicle is running, the side reinforcement is provided because the tire includes the side reinforcing layers 21 and 22. Layer 21,
Due to the rigidity of the left and right side portions B 1 and B 2 reinforced by 22, the radial tire 10 can continue running for a predetermined distance while supporting the load of the vehicle. However, since the side reinforcing layers 21 and 22 have different thicknesses, the side portion B 1 having the thick side reinforcing layer 21 has a higher rigidity than the side portion B 2 having the thin reinforcing layer 22. Yes, the tire durability running is good.
【００２０】次に、前記ラジアルタイヤ１０の四輪車両
への装着方法について説明する。通常、四輪車両の前輪
（前輪のラジアルタイヤ）は、車両に装着した状態で該
車輪の上部が横方向の外方に傾く、いわゆるキャンバ角
が付けられていると共に、後輪は、車両に装着した状態
で該車輪の下部が横方向の外方に傾く、いわゆるネガテ
ブキャンバ角が付けられている。Next, a method of mounting the radial tire 10 on a four-wheeled vehicle will be described. Usually, a front wheel (radial tire of a front wheel) of a four-wheeled vehicle is provided with a so-called camber angle in which an upper portion of the wheel is inclined outward in a lateral direction when mounted on the vehicle, and a rear wheel is attached to the vehicle. A so-called negative camber angle is provided, in which the lower part of the wheel is inclined outward in the lateral direction in the mounted state.
【００２１】前記の如き車両を運転して走行すると、前
輪は、直進においても、その中心より外側に荷重が移動
している状態になっているが、ハンドルを操舵して操向
すると、コーナーリング外側に更に荷重が移動する。即
ち、ハンドルを右に操舵した場合は、右側前輪の外側に
荷重が集中する状態となる。この状態は前輪（前輪のラ
ジアルタイヤ）の外側の歪が増大することを意味し、前
輪のラジアルタイヤの外側に故障が集中することにな
る。When the vehicle is driven and driven as described above, the front wheels are in a state in which the load moves outside the center even when the vehicle is going straight, but when the steering wheel is steered to steer, the front wheels are out of the cornering. The load moves further. That is, when the steering wheel is steered to the right, the load is concentrated outside the right front wheel. This state means that the distortion outside the front wheel (the radial tire of the front wheel) increases, and the failures are concentrated outside the radial tire of the front wheel.
【００２２】一方、後輪（後輪のラジアルタイヤ）は、
前輪のように操舵を行わないので、故障が車両の外側に
集中することはない。しかし、後輪（後輪のラジアルタ
イヤ）は、前記の如く、ネガテブキャンバ角が付されて
いるので、後輪のラジアルタイヤの車両内側に荷重の中
心があるようになっているので、後輪のラジアルタイヤ
の車両内側に荷重が集中し、該車両内側部分に故障が集
中する傾向がある。On the other hand, the rear wheels (rear radial tires)
Since steering is not performed as in the case of the front wheels, failures do not concentrate on the outside of the vehicle. However, since the rear wheels (rear radial tires) have a negative camber angle as described above, the center of the load is located inside the vehicle of the rear tires. The radial tire tends to concentrate on the inside of the vehicle, and the breakdown tends to concentrate on the inside of the vehicle.
【００２３】このため、前記四輪車両に、本実施形態の
ラジアルタイヤ１０を装着するにあたっては、車両の二
つの前輪は、厚いサイド補強層２１を配置した側を車両
の外側に位置させて装着し、車両の二つの後輪は、薄い
サイド補強層２２を配置した側を車両の外側に位置させ
た装着方法を採用したものである。Therefore, when the radial tire 10 of the present embodiment is mounted on the four-wheel vehicle, the two front wheels of the vehicle are mounted with the side on which the thick side reinforcing layer 21 is disposed positioned outside the vehicle. The two rear wheels of the vehicle adopt a mounting method in which the side on which the thin side reinforcing layer 22 is disposed is positioned outside the vehicle.
【００２４】本実施形態のラジアルタイヤ１０を前記の
如き装着方法で装着することによって、タイヤパンク走
行時に、荷重が多くかかり、故障が集中する部位に厚い
サイド補強層２１を位置させると共に、荷重のかかり具
合が少ない位置に薄いサイド補強層２２を位置して走行
することになるので、ラジアルタイヤのパンク走行時の
耐久性を損なうことなく、ラジアルタイヤの全体の重量
を軽減することができる。By mounting the radial tire 10 of this embodiment by the above-described mounting method, a large load is applied during tire puncture, and the thick side reinforcing layer 21 is located at a portion where failures are concentrated. Since the vehicle travels with the thin side reinforcing layer 22 positioned at a position where the degree of engagement is small, the overall weight of the radial tire can be reduced without impairing the durability of the radial tire during puncture traveling.
【００２５】本発明の実施形態の空気入りラジアルタイ
ヤを評価するために、厚い補強層を対称に配置した空気
入りラジアルタイヤの従来例と、薄い補強層を対称に配
置した空気入りラジアルタイヤの比較例１とを比較の対
象とし、本実施形態、従来例、及び、比較例１との各々
の空気入りラジアルタイヤの性能を比較測定した。比較
は、重量、転がり抵抗、及び、パンク耐久性を測定する
ことで行い、従来例を１００とした指数で表示した。In order to evaluate the pneumatic radial tire according to the embodiment of the present invention, a comparison is made between a conventional example of a pneumatic radial tire having a thick reinforcing layer arranged symmetrically and a pneumatic radial tire having a thin reinforcing layer arranged symmetrically. The performance of each of the pneumatic radial tires of the present embodiment, the conventional example, and Comparative Example 1 was compared and measured using Example 1 as a comparison target. The comparison was performed by measuring the weight, rolling resistance, and puncture durability, and was represented by an index with the conventional example being 100.
【００２６】転がり抵抗の測定は、外径１．７ｍのドラ
ム上にラジアルタイヤを接触させてドラムを回転させ、
一定速度まで上昇後、ドラムを惰行させて所定速度での
慣性モーメントから算出した値から次式によって評価し
た。The rolling resistance was measured by bringing a radial tire into contact with a drum having an outer diameter of 1.7 m and rotating the drum.
After ascending to a certain speed, the drum was coasted and evaluated from the value calculated from the moment of inertia at a predetermined speed by the following equation.
【００２７】 [0027]
【００２８】パンク耐久走行の試験は、パンクによって
ラジアルタイヤの充填内圧がゼロになった状態を想定
し、ラジアルタイヤの空気バルブを開口状態にして、故
障発生までの走行距離で評価した。In the puncture durability test, assuming a state in which the filling internal pressure of the radial tire became zero due to puncture, the air valve of the radial tire was opened, and the running distance until failure occurred was evaluated.
【００２９】前記測定評価の結果を次の表１に示す。The results of the above measurement and evaluation are shown in Table 1 below.
【００３０】[0030]
【表１】 [Table 1]
【００３１】前記表１によれば、補強層の厚みを薄くす
ることにより、ラジアルタイヤの重量を軽減し、転がり
抵抗性能を向上させることができるが、パンク耐久走行
性能は低下する傾向があることが解る。比較例１は、両
サイド部の補強層が薄いことで、従来例に比べてラジア
ルタイヤの重量を軽減し、転がり抵抗を向上することが
できるが、パンク耐久走行性能が著しく低下する。本実
施形態のラジアルタイヤは、両サイド部に一方の補強層
の厚みを厚く、他方を薄くしたことで、パンク耐久性能
を従来例とほぼ同じに維持できると共に、ラジアルタイ
ヤの重量の軽減と、転がり抵抗性能を向上させることが
できる。According to Table 1, by reducing the thickness of the reinforcing layer, the weight of the radial tire can be reduced and the rolling resistance performance can be improved, but the puncture durability running performance tends to decrease. I understand. In Comparative Example 1, the weight of the radial tire can be reduced and the rolling resistance can be improved as compared with the conventional example because the reinforcing layers on both sides are thin, but the puncture durability running performance is significantly reduced. In the radial tire of the present embodiment, the thickness of one reinforcing layer is increased on both sides and the other is reduced, so that the puncture durability can be maintained substantially the same as the conventional example, and the weight of the radial tire is reduced. Rolling resistance performance can be improved.
【００３２】次に、本発明の実施形態の空気入りラジア
ルタイヤを四輪車両へ装着する方法を評価するために、
厚い補強層を対称に配置した空気入りラジアルタイヤを
装着した従来例、薄い補強層を対称に配置した空気入り
ラジアルタイヤを装着した比較例２、及び、厚い補強層
と薄い補強層とからなるラジアルタイヤを本発明の装着
方法とは異なる反対装着した比較例３とを比較対象と
し、本発明の装着方法、従来例、比較例２、及び、比較
例３とのパンク耐久走行性能を測定して比較評価し、従
来例を１００とした指数で表示した。前記比較評価の結
果を次の表２に示す。Next, in order to evaluate a method of mounting the pneumatic radial tire according to the embodiment of the present invention on a four-wheeled vehicle,
Conventional example in which a pneumatic radial tire in which a thick reinforcing layer is arranged symmetrically is mounted, Comparative Example 2 in which a pneumatic radial tire in which a thin reinforcing layer is arranged symmetrically is mounted, and a radial including a thick reinforcing layer and a thin reinforcing layer A puncture durability running performance of the mounting method of the present invention, the conventional example, the comparative example 2, and the comparative example 3 was measured by using the comparative example 3 in which the tire was mounted opposite to the mounting method of the present invention as a comparison object. Comparative evaluation was performed, and the result was indicated by an index with the conventional example being 100. The results of the comparative evaluation are shown in Table 2 below.
【００３３】[0033]
【表２】 [Table 2]
【００３４】前記表２によれば、比較例２及び比較例３
とは、従来例に比べてパンク耐久走行性能が非常に低下
しているのに対して、本発明の装着方法では、前記パン
ク耐久走行性能は従来例に比べて殆ど低下していない。
特に、比較例３は、本発明と同じ厚い補強層と薄い補強
層とからなるラジアルタイヤを車両に装着しながらその
装着方法が異なることで、パンク耐久走行性能が本発明
の装着方法に比べて著しく低下している。According to Table 2, Comparative Example 2 and Comparative Example 3
This means that the puncture durability running performance is significantly reduced as compared with the conventional example, whereas the puncture durability running performance is hardly reduced in the mounting method of the present invention as compared with the conventional example.
In particular, Comparative Example 3 is different from the mounting method according to the present invention in that the mounting method is different while the radial tire including the same thick reinforcing layer and the thin reinforcing layer as the present invention is mounted on the vehicle while the tire is mounted. It has dropped significantly.
【００３５】[0035]
【発明の効果】以上の説明から理解されるように、本発
明の空気入りラジアルタイヤは、パンク時の耐久走行性
の向上のために両サイド部に備えたサイド補強層を左右
でその厚さを異にしたことによって、タイヤ重量を軽減
し、かつ、タイヤの転がり抵抗を向上させることができ
る。As can be understood from the above description, the pneumatic radial tire according to the present invention has side reinforcing layers provided on both sides for improving the durability during puncturing. The tire weight can be reduced and the rolling resistance of the tire can be improved.
【００３６】また、車両への前記本発明の空気入りラジ
アルタイヤの装着にあたって、前輪がサイド補強層の厚
い側を車両の外側に位置して装着すると共に、後輪をサ
イド補強層の厚い側を車両の内側に位置して装着してこ
とで、パンク時の耐久性を維持しつつ、タイヤ重量を軽
減し、かつ、タイヤの転がり抵抗を向上させることがで
きる。In mounting the pneumatic radial tire of the present invention on a vehicle, the front wheels are mounted with the side reinforcing layer having a thick side positioned outside the vehicle, and the rear wheels are mounted on the side having a thick side reinforcing layer. By being mounted inside the vehicle, the tire weight can be reduced and the rolling resistance of the tire can be improved while maintaining durability during puncturing.
【図１】本発明の一実施形態の空気入りラジアルタイヤ
の断面図。FIG. 1 is a sectional view of a pneumatic radial tire according to an embodiment of the present invention.
１０ 空気入りラジアルタイヤ １１ ゴム層 １２ ビート部 １３ ビートコア １４ プライコード １５ カーカス層 １６ スチールコード １７ スチールベルト層 １８ トレッド部 １９ リブ溝 ２１ 厚いサイド補強層 ２２ 薄いサイド補強層 Ａ クラウン部 Ｂ1 サイド部 Ｂ2 サイド部DESCRIPTION OF SYMBOLS 10 Pneumatic radial tire 11 Rubber layer 12 Beat part 13 Beat core 14 Ply cord 15 Carcass layer 16 Steel cord 17 Steel belt layer 18 Tread part 19 Rib groove 21 Thick side reinforcing layer 22 Thin side reinforcing layer A Crown part B 1 side part B 2 side part
Claims (2)
コアと、クラウン部から両サイド部を経て両ビート部に
延び、該ビートコアに巻回されてビート部に係留された
ラジアルコード層よりなるカーカスプライと、該カーカ
スプライのクラウン部のラジアル方向外側に配置され、
実質的に非伸長性のコードを被覆ゴム中に埋設して成る
ベルトと、該ベルトのラジアル方向外側にに配置された
トレッドとを備えた空気入りラジアルタイヤにおいて、 前記カーカスプライの内面に沿って、前記両サイド部の
全域にわたって、子午断面が三日月状のサイド補強層を
備え、該サイド補強層は、左右のサイド部で厚みが異な
ることを特徴とする空気入りラジアルタイヤ。1. A carcass comprising: a beat core provided on a pair of left and right beat portions; and a radial cord layer extending from the crown portion to both beat portions via both side portions, wound around the beat core, and anchored to the beat portion. A ply, arranged radially outward of a crown portion of the carcass ply,
In a pneumatic radial tire including a belt having a substantially inextensible cord embedded in a covering rubber, and a tread disposed radially outward of the belt, a pneumatic radial tire includes a belt extending along an inner surface of the carcass ply. A pneumatic radial tire, comprising a side reinforcing layer having a crescent cross section in a meridional section over the entire area of the both side portions, wherein the side reinforcing layers have different thicknesses on left and right side portions.
ヤの四輪車両への装着方法において、 車両の前輪では、サイド補強層の厚い側を車両の外側に
位置して装着し、車両の後輪では、サイド補強層の厚い
側を車両の内側に位置して装着することを特徴とする空
気入りラジアルタイヤの車両への装着方法。2. The method for mounting a pneumatic radial tire on a four-wheeled vehicle according to claim 1, wherein the front side of the vehicle is mounted with the thick side of the side reinforcing layer positioned outside the vehicle and the rear side of the vehicle. A method of mounting a pneumatic radial tire on a vehicle, wherein the wheel is mounted with the thick side of the side reinforcing layer positioned inside the vehicle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29629396A JP3703922B2 (en) | 1996-11-08 | 1996-11-08 | Pneumatic radial tire having a side reinforcing layer and method for mounting the tire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29629396A JP3703922B2 (en) | 1996-11-08 | 1996-11-08 | Pneumatic radial tire having a side reinforcing layer and method for mounting the tire |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10138719A true JPH10138719A (en) | 1998-05-26 |
| JP3703922B2 JP3703922B2 (en) | 2005-10-05 |
Family
ID=17831688
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29629396A Expired - Fee Related JP3703922B2 (en) | 1996-11-08 | 1996-11-08 | Pneumatic radial tire having a side reinforcing layer and method for mounting the tire |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3703922B2 (en) |
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| JP2006199053A (en) * | 2005-01-18 | 2006-08-03 | Yokohama Rubber Co Ltd:The | Pneumatic tire and its mounting method |
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