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JP2006194814A - Pneumatic tire testing method and tester - Google Patents

Pneumatic tire testing method and tester Download PDF

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JP2006194814A
JP2006194814A JP2005008757A JP2005008757A JP2006194814A JP 2006194814 A JP2006194814 A JP 2006194814A JP 2005008757 A JP2005008757 A JP 2005008757A JP 2005008757 A JP2005008757 A JP 2005008757A JP 2006194814 A JP2006194814 A JP 2006194814A
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test
tire
tread
road surface
road
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JP4561372B2 (en
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Toshiro Oyama
俊郎 大山
Toshio Ochiai
敏男 落合
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Yokohama Rubber Co Ltd
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Yokohama Rubber Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a pneumatic tire testing method and a tester for efficiently reproducing tearing similar to the tearing of a tread coming into existence in the market and evaluating tear resistance of a tire. <P>SOLUTION: A test tire 1 with a prescribed inner pressure is loaded with a prescribed load. A tread is brought into contact with a lower-stage-side road surface 3 of a test road 2 having an extended step 5 while fixing a slip angle d in a direction approaching the step 5 with the extension direction of the step 5 taken as the traveling direction FL of the test tire. The test tire is rolled in contact with the step 5 to steadily create a state where a tread end part 1d is going to get on the step 5 while being caused to travel in the extension direction of the step 5. When the end part 1d having got on an upper-stage-side road surface 4 of the test road 2 is drawn back to the road surface 3, tears can be reproduced as the end part 1d is torn apart under a tensile force f2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、空気入りタイヤの試験方法および試験装置に関し、さらに詳しくは、市場で発生するトレッドのティアを効率よく的確に再現して、タイヤの耐ティア性を評価することができる空気入りタイヤの試験方法および試験装置に関するものである。   The present invention relates to a test method and a test apparatus for a pneumatic tire. More specifically, the present invention relates to a pneumatic tire that can efficiently and accurately reproduce the tread tier generated in the market and evaluate the tire tear resistance. The present invention relates to a test method and a test apparatus.

従来からトラック、トレーラ等の高速連続走行車両で使用される重荷重用タイヤには、トレッド端部が引きちぎられる、いわゆるティアが発生することがあり、特にトレッド端部に摩耗犠牲リブが設けられた空気入りタイヤでは、ティアが発生しやすいという問題があった。   Conventionally, heavy-duty tires used in high-speed continuously traveling vehicles such as trucks and trailers may generate so-called tears that tear the tread edge, and in particular, air with a wear sacrifice rib provided at the tread edge. There was a problem that the tires were easily tiered.

この摩耗犠牲リブは、偏摩耗抑制のために上記した車両に使用されるタイヤに設けられることが多く、タイヤが路面の段差に乗り上がった際に、この摩耗犠牲リブが段差で引張力を受け、ティアが発生する起点になっていた。   This wear sacrificial rib is often provided on a tire used in the above-mentioned vehicle to suppress uneven wear, and when the tire climbs on a road step, the wear sacrificial rib receives a tensile force at the step. This was the starting point for the tier.

このタイヤの耐ティア性を評価するには、実車に装着されたタイヤを段差に乗り上げて評価をしていたが、段差への進入角や段差乗り上げ時の抵抗に対するハンドル操作のばらつきによって、同一仕様のタイヤを用いても、市場で発生するようなティアを発生させることが困難であり、また、発生したティアの程度のばらつきが大きいため、仕様が異なるタイヤで耐ティア性を比較することが困難であった。さらに、この方法では評価精度を向上させるために大量のタイヤを評価する必要があり、時間もコストもかかり効率的ではないという問題があった。   In order to evaluate the tear resistance of this tire, it was evaluated by riding the tire mounted on the actual vehicle on the step, but the same specifications were made depending on the steering angle with respect to the approach angle to the step and the resistance when climbing the step. It is difficult to generate tiers that occur in the market even when using different tires, and it is difficult to compare tier resistance between tires with different specifications due to large variations in the degree of tiers generated Met. Furthermore, this method has a problem that it is necessary to evaluate a large number of tires in order to improve the evaluation accuracy, which is time consuming and expensive and is not efficient.

空気入りタイヤのショルダー部に設けた細リブに発生するクラックや欠けを再現する評価装置としては、基盤上を試験タイヤを円軌跡を描くように走行させて、その円軌跡上に突起物を配置して、試験タイヤを乗り上げさせるものが提案されている(特許文献1参照)。   As an evaluation device that reproduces cracks and chips generated in the thin ribs provided on the shoulder of a pneumatic tire, the test tire is run on the base in a circular locus, and the protrusions are placed on the circular locus. And what makes a test tire get on is proposed (refer patent document 1).

しかしながら、この装置は市場での縁石や轍の乗り越えの繰り返しによるクラック等を再現するだけの装置であり、突起に乗り上げた時にタイヤが跳ねる構造となっており、また、突起に対して円周運動なので、突起に沿って継続的に接触しながら転動することができず、市場で発生するティアを再現することはできなかった。
実開平7−36038号公報
However, this device only reproduces cracks, etc. due to repeated curbstones and overhangs on the market, and it has a structure in which the tire jumps when it rides on the protrusion, and it also moves circumferentially with respect to the protrusion Therefore, it was impossible to roll while continuously contacting along the protrusion, and it was not possible to reproduce the tier generated in the market.
Japanese Utility Model Publication No. 7-36038

本発明の目的は、市場で発生するトレッドのティアと類似したティアを効率よく再現でき、タイヤの耐ティアを評価できる空気入りタイヤの試験方法および試験装置を提供することにある。   An object of the present invention is to provide a test method and a test apparatus for a pneumatic tire that can efficiently reproduce a tier similar to a tread tier generated in the market and can evaluate a tire tier resistance.

上記目的を達成するため本発明の空気入りタイヤの試験方法は、試験タイヤをリム組みして所定の内圧にし、所定の荷重を負荷して、延設された段差を有する試験路の下段側路面にトレッドを接地させるとともに、該段差の延設方向を前記試験タイヤの進行方向として、前記段差近づく方向にスリップ角を固定して、この段差に接触させながら前記試験タイヤを転動させることを特徴とするものである。   In order to achieve the above object, a pneumatic tire testing method according to the present invention includes a test tire having a rim assembled to a predetermined internal pressure, loaded with a predetermined load, and a lower road surface on a test road having an extended step. The tread is grounded, the extending direction of the step is defined as the traveling direction of the test tire, the slip angle is fixed in the direction approaching the step, and the test tire is rolled while being in contact with the step. It is what.

また、本発明の空気入りタイヤの試験装置は、リム組みした試験タイヤをスリップ角を固定して転動可能に保持するタイヤ保持装置と、延設された段差を有する試験路とを備え、前記タイヤ保持装置と前記試験路との少なくとも一方を前記タイヤ保持装置が保持した試験タイヤのトレッドを前記試験路に接地させる方向に移動可能として、該方向に荷重を負荷できるようにし、前記タイヤ保持装置と前記試験路との少なくとも一方を前記段差の延設方向に移動可能とすることを特徴とするものである。   The pneumatic tire testing apparatus of the present invention includes a tire holding device that holds a rim-assembled test tire so as to be able to roll with a fixed slip angle, and a test road having an extended step, The tire holding device is configured such that at least one of the tire holding device and the test road can be moved in a direction in which a tread of a test tire held by the tire holding device is grounded to the test road, and a load can be applied in the direction. And at least one of the test path is movable in the extending direction of the step.

本発明の空気入りタイヤの試験方法によれば、試験タイヤをリム組みして所定の内圧にし、所定の荷重を負荷して、延設された段差を有する試験路の下段側路面にトレッドを接地させるとともに、この段差の延設方向を試験タイヤの進行方向として、段差に近づく方向にスリップ角を固定して、この段差に接触させながら試験タイヤを転動させるので、スリップ角がぶれることがなく、このスリップ角によって、試験タイヤが段差に擦り寄るように転動してトレッド端部が段差を乗り上がろうとする一方で、段差の延設方向に進行させられる状態を定常的に作り出すことができる。   According to the test method for a pneumatic tire of the present invention, the test tire is assembled to a rim to have a predetermined internal pressure, a predetermined load is applied, and the tread is grounded on the lower road surface of the test road having the extended step. The extension direction of this step is the traveling direction of the test tire, the slip angle is fixed in the direction approaching the step, and the test tire is rolled while being in contact with this step, so the slip angle is not blurred. By this slip angle, the test tire rolls so as to rub against the step and the end of the tread tries to climb over the step, while it is possible to constantly create a state where the test tire is advanced in the extending direction of the step. .

これによって、試験路の上段側路面に乗り上がったトレッド端部が、下段側路面に引き戻される際に、引裂き力が発生し、市場で発生するティアと類似したティアを効率よく、程度のばらつきを小さくして再現できる。   As a result, when the end of the tread that has reached the upper road surface of the test road is pulled back to the lower road surface, a tearing force is generated, and a tier similar to the tier generated in the market can be efficiently and unevenly distributed. Can be reproduced with a small size.

また発生したティアの程度を把握することができるので、耐ティア性を効率よく評価でき、スペックの異なるタイヤの耐ティア性の比較評価も可能となる。   In addition, since the degree of the generated tier can be grasped, the tier resistance can be evaluated efficiently, and the tier resistance of tires having different specifications can be compared and evaluated.

本発明の空気入りタイヤの試験装置によれば、リム組みした試験タイヤをスリップ角を固定して転動可能に保持するタイヤ保持装置と、延設された段差を有する試験路とを備え、タイヤ保持装置と試験路との少なくとも一方をタイヤ保持装置が保持した試験タイヤのトレッドを試験路に接地させる方向に移動可能として、この方向に荷重を負荷できるようにしたので、試験タイヤのトレッドを試験路の下段側路面に接地させて、所定の荷重を負荷することができる。   According to the pneumatic tire testing apparatus of the present invention, the tire includes a tire holding device that holds the rim assembled test tire so that the slip angle is fixed and is rollable, and a test road having an extended step. Since the tread of the test tire held by the tire holding device can be moved in the direction to contact the test road with at least one of the holding device and the test road, the load can be applied in this direction. A predetermined load can be applied by grounding the road surface on the lower side of the road.

さらに、タイヤ保持装置と試験路との少なくとも一方を段差の延設方向に移動可能としたので、試験タイヤの進行方向を段差の延設方向として固定したスリップ角をつけて、段差に擦り寄るように接触させながら転動させることができる。   Furthermore, since at least one of the tire holding device and the test road can be moved in the extending direction of the step, a slip angle is fixed with the traveling direction of the test tire fixed as the extending direction of the step so that it rubs against the step. It can be rolled while in contact.

この構造によって、上記した試験方法が実施可能となり、市場で発生するティアと類似したティアを効率よく、程度のばらつきを小さくして再現できるとともに、発生したティアの程度を把握することができるので、耐ティア性を効率よく評価でき、スペックの異なるタイヤの耐ティア性の比較評価も可能となる。   With this structure, the test method described above can be implemented, and a tier similar to a tier generated in the market can be efficiently reproduced with a small variation in the degree, and the degree of the generated tier can be grasped. The tear resistance can be evaluated efficiently, and it is possible to compare and evaluate the tear resistance of tires having different specifications.

以下、本発明の空気入りタイヤの試験方法および試験装置を図に示した実施形態に基づいて説明する。図4に試験装置の全体概要を正面図で例示する。この図において、試験タイヤ1は、リブ1aと周方向溝1bとを有したリブパターンで、符号Hはタイヤ断面高さ、符号Dはトレッドの溝深さを示している。試験装置は、以下に説明するタイヤ保持装置6と試験路2とを備えている。   Hereinafter, a test method and a test apparatus for a pneumatic tire according to the present invention will be described based on the embodiments shown in the drawings. FIG. 4 illustrates a general outline of the test apparatus in a front view. In this figure, the test tire 1 is a rib pattern having ribs 1a and circumferential grooves 1b. Reference numeral H indicates the tire cross-sectional height, and reference numeral D indicates the tread groove depth. The test apparatus includes a tire holding device 6 and a test path 2 described below.

試験タイヤ1は、リム11に装着されて、所定の内圧にされた状態でタイヤ保持装置5の保持アーム7に転動可能に取り付けられ、左右方向に角度を自在に振ることができ、所定の角度で固定できる構造となっている。   The test tire 1 is attached to the rim 11 and attached to the holding arm 7 of the tire holding device 5 in a state of being set to a predetermined internal pressure so as to be able to roll, and can freely swing an angle in the left-right direction. The structure can be fixed at an angle.

保持アーム7は基台10に上下方向に移動可能に立設された支持柱8に取り付けられ、所定の高さで固定できる構造となっている。保持アーム7はアームの長手方向に移動可能となっており、長手方向に移動させることによって容易に、試験タイヤ1を試験路の段差の近傍に配置することができる。タイヤ保持装置5は、基台10に設けられた移動用ローラで図示しない駆動モータ等で移動可能となっている。   The holding arm 7 is attached to a support column 8 erected on the base 10 so as to be movable in the vertical direction, and has a structure that can be fixed at a predetermined height. The holding arm 7 is movable in the longitudinal direction of the arm, and the test tire 1 can be easily arranged in the vicinity of the step on the test road by moving in the longitudinal direction. The tire holding device 5 is movable by a drive motor or the like (not shown) with a moving roller provided on the base 10.

保持アーム6に取り付けられた試験タイヤ1の下方には試験路2が配置され、平面状の上段側路面4と下段側路面3とを有して、段差5が直線状に延設されている。図4において、符号hは段差の高さを、符号cは段差エッジ角度を示している。上段側路面4は着脱可能で、試験条件に応じて選択された段差の高さh、段差エッジ角度cを有する上段側路面4が下段側路面3の表面に装着固定される。   A test road 2 is arranged below the test tire 1 attached to the holding arm 6, and has a flat upper stage road surface 4 and a lower stage side road surface 3, and a step 5 extends linearly. . In FIG. 4, the symbol h indicates the height of the step, and the symbol c indicates the step edge angle. The upper stage road surface 4 is detachable, and the upper stage road surface 4 having a step height h and a step edge angle c selected according to the test conditions is attached and fixed to the surface of the lower stage road surface 3.

試験の実施に際して、まず、試験タイヤ1および試験路2のセッティングをする。試験タイヤ1は、試験路2の下段側路面3にトレッドが接地した時に、段差5の近傍となるように位置決めされ、スリップ角をつけるために、左右方向に振った所定の角度で固定される。   In carrying out the test, first, the test tire 1 and the test road 2 are set. The test tire 1 is positioned so as to be in the vicinity of the step 5 when the tread contacts the lower road surface 3 of the test road 2, and is fixed at a predetermined angle swung in the left-right direction to give a slip angle. .

その後に支持柱8を下方移動させ、試験タイヤ1を下段側路面3に接地させて所定の負荷荷重になる位置で移動を止めて試験タイヤ1の高さ位置が固定される。試験タイヤ1への荷重の負荷は、支持柱8を固定しておき、試験路2を上昇させて与えることもでき、支持柱8と試験路2の少なくとも一方が互いに近接する方向に移動して負荷を与えるようにすればよい。   Thereafter, the support pillar 8 is moved downward, the test tire 1 is grounded to the lower stage road surface 3, and the movement is stopped at a position where a predetermined load is applied, so that the height position of the test tire 1 is fixed. The load applied to the test tire 1 can be given by fixing the support column 8 and raising the test path 2, and at least one of the support column 8 and the test path 2 moves in a direction close to each other. What is necessary is just to give load.

図1〜3に基づいて本発明の試験方法について説明する。図1に、タイヤ保持装置6を省略して、平面方向で試験状態を示す。上記のセッティングが完了した試験タイヤ1を図示しないタイヤ保持装置6を段差5の延設方向に移動させる。図中の線分FLは、段差5の延設方向と平行なタイヤ進行方向線であり、線分CLはタイヤ幅方向中央線である。タイヤ進行方向線FLとタイヤ幅方向中央線CLとがなす角度dがスリップ角dとなっている。   The test method of the present invention will be described based on FIGS. In FIG. 1, the tire holding device 6 is omitted, and the test state is shown in the plane direction. The tire holding device 6 (not shown) is moved in the extending direction of the step 5 in the test tire 1 for which the above setting has been completed. A line segment FL in the figure is a tire traveling direction line parallel to the extending direction of the step 5, and a line segment CL is a center line in the tire width direction. An angle d formed by the tire traveling direction line FL and the tire width direction center line CL is a slip angle d.

このスリップ角dによって、試験タイヤ1は常に、段差5に近づくように転動して、トレッド端部1dが上段側路面4に乗り上がろうとする一方で、段差5の延設方向に進行させられるので、図1に示すようにトレッド端部1dの一部が段差11に乗り上がって、乗り上がった部分の進行方向前方では圧縮力f1が発生し、後方には引張力f2が発生する。   Due to this slip angle d, the test tire 1 always rolls closer to the step 5, and the tread end 1d tries to ride on the upper road surface 4, while it advances in the extending direction of the step 5. Therefore, as shown in FIG. 1, a part of the tread end portion 1d climbs on the step 11, and a compressive force f1 is generated in the forward direction of the climbed portion, and a tensile force f2 is generated in the rear.

図2、3は、試験タイヤ1がトレッド端部1dに摩耗犠牲リブ1cを有する場合の図であり、図2に圧縮力f1が発生している部分の正面図を、図3に引張力f2が発生している部分の正面図を示す。   2 and 3 are diagrams in the case where the test tire 1 has the wear sacrificial rib 1c at the tread end 1d. FIG. 2 is a front view of a portion where the compression force f1 is generated, and FIG. 3 is a tensile force f2. The front view of the part which has generate | occur | produced is shown.

図2に示すように、上段側路面4に乗り上がった部分の前方のトレッド端部1dは、上段側路面4に向う圧縮力f1を受け、摩耗犠牲リブ1cは圧縮されて座屈変形することになる。   As shown in FIG. 2, the tread end 1d in front of the portion riding on the upper road surface 4 receives a compressive force f1 toward the upper road surface 4, and the wear sacrifice rib 1c is compressed and buckled. become.

一方、図3に示すように上段側路面4乗り上がった部分の後方のトレッド端部1dは、段差5を登りきれずに下段側路面3に引き戻されて、摩耗犠牲リブ1cが上段側路面4に押し付けられて引っ掛かり、下段側路面3に向う引張力f2によって引張られて、その周方向溝1bの隅部が段差のエッジによって引裂かれてティアが発生する。   On the other hand, as shown in FIG. 3, the tread end portion 1 d behind the portion that has climbed over the upper stage road surface 4 is pulled back to the lower stage road surface 3 without being able to climb the step 5, and the wear sacrificial ribs 1 c are formed on the upper stage road surface 4. Is pushed by and pulled by the pulling force f2 toward the lower road surface 3, and the corner of the circumferential groove 1b is torn by the edge of the step to generate a tear.

スリップ角は、1°以上10°以下にすると上段側路面4にトレッド端部1dが乗り上がりやすく、かつ、乗り上がったトレッド端部1dが下段側路面3に引き戻されやすくなり、ティアを再現しやすくなる。   When the slip angle is 1 ° or more and 10 ° or less, the tread end 1d is likely to ride on the upper road surface 4 and the raised tread end 1d is easily pulled back to the lower road surface 3 to reproduce the tier. It becomes easy.

上記した現象は、摩耗犠牲リブ1cにのみに発生するものではなく、一般的なリブパターンのトレッド端部1dでも発生する。   The phenomenon described above does not occur only in the wear sacrificial rib 1c but also occurs in the tread end portion 1d of a general rib pattern.

このように、本発明の試験方法によれば定常的に、トレッド端部1dに対して段差5によってティアが発生する状態を作り出すことができ、市場で発生するティアに類似したティアを効率的に、程度のばらつきを少なくして発生させることが可能となる。そして、発生したティアの程度を把握することができる。   As described above, according to the test method of the present invention, it is possible to create a state in which a tier is generated by the step 5 with respect to the tread end 1d steadily, and a tier similar to a tier generated in the market can be efficiently created. Therefore, it is possible to reduce the degree of variation. Then, the degree of the generated tier can be grasped.

この実施形態では、タイヤ保持装置6を段差5の延設方向に移動させているが、タイヤ保持装置6を固定して、試験路2を段差5の延設方向に移動させてもよく、例えば、ドラム状の試験路2にすることもできる。   In this embodiment, the tire holding device 6 is moved in the extending direction of the step 5, but the tire holding device 6 may be fixed and the test road 2 may be moved in the extending direction of the step 5, for example, A drum-shaped test path 2 can also be formed.

試験を開始する際に、当初からトレッド端部1dの一部を上段側路面2に接触させた状態として試験タイヤ1を転動させることもできるが、トレッドを下段側路面3に接地させて、段差5とトレッド端部1dとの最短距離を50mm以下となるように試験タイヤ1を配置するのが好ましい。即ち、段差5に最も近いトレッド端部1dを段差5にちょうど接触させるか50mmの範囲内とする。この範囲に試験タイヤ1を配置して試験を開始することによって、セッティングを容易にして試験条件のばらつきを抑制しつつ、確実にトレッド端部1dを段差5に接触させて上段側路面4への乗り上がりおよび下段側路面3への戻りを発生させることができる。   When starting the test, the test tire 1 can be rolled with a part of the tread end 1d in contact with the upper road surface 2 from the beginning, but the tread is grounded to the lower road surface 3, It is preferable to arrange the test tire 1 so that the shortest distance between the step 5 and the tread end 1d is 50 mm or less. That is, the tread end 1d closest to the step 5 is brought into contact with the step 5 or within a range of 50 mm. By placing the test tire 1 in this range and starting the test, the tread end 1d is reliably brought into contact with the step 5 while facilitating setting and suppressing variations in the test conditions, so that the upper road surface 4 The ride and return to the lower road surface 3 can be generated.

本発明の試験においては、段差高さhはトレッド溝の深さD以上でかつ、タイヤ断面高さHの50%以下とすることが好ましい。トレッド溝の深さDよりも低いと乗り上がったトレッド端部1dが下段側路面3に引き戻される際に十分な引張力が発生せず、タイヤ断面高さHの50%を超えるとトレッド端部1dが上段側路面4に乗り上がりにくくなるため、いずれもティアを再現しにくくなる。   In the test of the present invention, the step height h is preferably not less than the depth D of the tread groove and not more than 50% of the tire cross-section height H. When the tread end 1d that has ridden is lower than the tread groove depth D and pulled back to the lower road surface 3, sufficient tensile force is not generated. When the tire cross section height H exceeds 50%, the tread end Since it becomes difficult for 1d to ride on the upper road surface 4, it is difficult to reproduce the tier in any case.

段差の縦断面形状は、上段側路面4の略水平の直線と側壁面の直線とからなる角状として、段差のエッジ角度cを90度以上120以下とすることが好ましい。この角度が90度未満であると、エッジが鋭利すぎてトレッド端部1dが食い込んで上段側路面4に乗り上がりにくくなり、120度を超えると上段側路面4に乗り上がったトレッド端部1dが下段側路面3に引き戻される際に引っ掛かりにくく、十分な引張力が発生せず、いずれもティアを再現しにくくなる。   The vertical cross-sectional shape of the step is preferably an angle formed by a substantially horizontal straight line of the upper side road surface 4 and a straight line of the side wall surface, and the edge angle c of the step is preferably 90 degrees or more and 120 or less. If this angle is less than 90 degrees, the edge is too sharp and the tread end portion 1d bites into the upper stage road surface 4, and if it exceeds 120 degrees, the tread end part 1d that rides on the upper stage road surface 4 becomes When pulled back to the lower side road surface 3, it is difficult to be caught and a sufficient tensile force is not generated, so that it is difficult to reproduce the tier.

試験タイヤ1の負荷荷重は、市場で想定される使用条件に対応させて、タイヤの規格最大荷重の70%以上130%以下とするのが好ましい。   The load load of the test tire 1 is preferably 70% or more and 130% or less of the standard maximum load of the tire in accordance with the use conditions assumed in the market.

また、試験タイヤ1の内圧は、市場で想定される使用条件に対応させて、規格最大空気圧の70%〜120%とするのが好ましい。   Further, the internal pressure of the test tire 1 is preferably 70% to 120% of the standard maximum air pressure in accordance with the usage conditions assumed in the market.

タイヤサイズが11R22.5(規格最大荷重26.73kN、規格最大空気圧700kPa)のリブパターンの空気入りタイヤを用いて、負荷荷重26.73kN、空気圧700kPa、スリップ角5°、段差エッジ角度を90度とし、試験路面を鋼材にしたことを共通条件として、段差の高さhのみを表1に示すように6通り(実施例1〜6)に変えて、繰り返し10回試験を実施し、市場で発生するティアと類似したティアの発生頻度(市場ティアの再現性)を評価した。その評価結果を表1に示す。   Using a pneumatic tire with a rib pattern of 11R22.5 (standard maximum load 26.73 kN, standard maximum air pressure 700 kPa), load load 26.73 kN, air pressure 700 kPa, slip angle 5 °, step edge angle 90 degrees As a common condition that the test road surface was made of steel, only the height h of the step was changed to 6 types (Examples 1 to 6) as shown in Table 1, and the test was repeatedly performed 10 times. The frequency of occurrence of tiers similar to the generated tiers (market tier reproducibility) was evaluated. The evaluation results are shown in Table 1.

尚、表中のDはトレッド溝の深さを示しており、Hはタイヤ断面高さを示している。タイヤ断面高さHは、トレッド溝の深さDよりもはるかに大きいので、段差の高さhは表1において右側ほど大きくなっている。市場ティアの再現性が100%の場合は二重丸印、90〜70%の場合は丸印、60〜50%の場合は三角印として表に示した。   In the table, D indicates the tread groove depth, and H indicates the tire cross-section height. Since the tire cross-section height H is much larger than the tread groove depth D, the height h of the step becomes larger toward the right side in Table 1. When the market tier reproducibility is 100%, it is shown in the table as a double circle, 90-70% as a circle, and 60-50% as a triangle.

Figure 2006194814
Figure 2006194814

実施例1〜6のすべてにおいて市場ティアの再現性が50%以上となり、高い再現性が実現でき、ティアの程度のばらつきも少なく安定したティアを再現できた。特に、段差の高さhをトレッド溝の深さD以上でかつタイヤ断面高さHの50%以下とすると市場ティアの再現性を向上させることができた。
この結果から効率よく市場で発生するティアを再現でき、時間およびコストを削減ができることが確認できた。
In all of Examples 1 to 6, the market tier reproducibility was 50% or more, high reproducibility was achieved, and a stable tier was reproduced with little variation in tier level. In particular, when the height h of the level difference is not less than the depth D of the tread groove and not more than 50% of the tire cross-section height H, the reproducibility of the market tier can be improved.
From this result, it was confirmed that the tier generated in the market could be efficiently reproduced and the time and cost could be reduced.

本発明の試験方法において、試験タイヤが段差に接触しながら段差の延設方向に進行してトレッド端部の一部が段差に乗り上がっている状態を示す平面図である。In the test method of this invention, it is a top view which shows the state which a test tire advances to the extending direction of a level | step difference, contacting a level | step difference, and a part of tread edge part has climbed on the level | step difference. 図1において、圧縮力f1が作用する部分を示す正面拡大図である(摩耗犠牲リブを有する場合)。In FIG. 1, it is a front enlarged view which shows the part to which the compression force f1 acts (when it has a wear sacrifice rib). 図1において、引張力f2が作用する部分を示す正面拡大図である(摩耗犠牲リブを有する場合)。In FIG. 1, it is a front enlarged view which shows the part to which the tensile force f2 acts (when it has an abrasion sacrifice rib). 本発明の試験装置の全体概要を例示する説明図である。It is explanatory drawing which illustrates the whole outline | summary of the testing apparatus of this invention.

符号の説明Explanation of symbols

1 試験タイヤ
1a リブ
1b 周方向溝
1c 摩耗犠牲リブ
1d トレッド端部
2 試験路
3 下段側路面
4 上段側路面
5 段差
6 タイヤ保持装置
7 保持アーム
8 支持柱
9 移動用ローラ
10 基台
11 リム
c 段差エッジ角度
d スリップ角
h 段差高さ
f1 圧縮力
f2 引張力
D トレッド溝深さ
H タイヤ断面高さ
CL タイヤ幅方向中心線
FL タイヤ進行方向線
1 Test tire
1a rib
1b Circumferential groove
1c wear sacrificial rib 1d tread edge 2 test path
3 Lower side road surface 4 Upper side road surface 5 Step 6 Tire holding device 7 Holding arm 8 Supporting column 9 Moving roller 10 Base 11 Rim c Step edge angle d Slip angle h Step height f1 Compression force f2 Tensile force D Tread groove depth Length H Tire cross section height CL Tire width direction center line FL Tire traveling direction line

Claims (7)

試験タイヤをリム組みして所定の内圧にし、所定の荷重を負荷して、延設された段差を有する試験路の下段側路面にトレッドを接地させるとともに、該段差の延設方向を前記試験タイヤの進行方向として、前記段差に近づく方向にスリップ角を固定し、この段差に接触させながら前記試験タイヤを転動させる空気入りタイヤの試験方法。   The test tire is assembled with a rim to have a predetermined internal pressure, a predetermined load is applied, and the tread is grounded to the lower road surface of the test road having the extended step, and the extending direction of the step is set to the test tire. As a traveling direction, a pneumatic tire test method in which a slip angle is fixed in a direction approaching the step, and the test tire is rolled while being in contact with the step. 前記段差の高さを前記試験タイヤのトレッド溝の深さ以上とし、かつ、前記試験タイヤのタイヤ断面高さの50%以下とする請求項1に記載の空気入りタイヤの試験方法。   The method for testing a pneumatic tire according to claim 1, wherein a height of the step is set to be equal to or greater than a depth of a tread groove of the test tire and equal to or less than 50% of a tire cross-sectional height of the test tire. 前記段差のエッジ角度を90度以上120度以下とする請求項1または2に記載の空気入りタイヤの試験方法。   The method for testing a pneumatic tire according to claim 1 or 2, wherein an edge angle of the step is 90 degrees or more and 120 degrees or less. 前記スリップ角を1°〜10°とする請求項1〜3のいずれかに記載の空気入りタイヤの試験方法。   The test method for a pneumatic tire according to claim 1, wherein the slip angle is 1 ° to 10 °. 前記試験タイヤに負荷する負荷荷重を該試験タイヤの規格最大荷重の70%以上130%以下とする請求項1〜4のいずれかに記載の空気入りタイヤの試験方法。   The pneumatic tire test method according to claim 1, wherein a load applied to the test tire is 70% or more and 130% or less of a standard maximum load of the test tire. 試験開始時の前記試験タイヤと前記段差との最短距離を50mm以下とする請求項1〜5のいずれかに記載の空気入りタイヤの試験方法。   The test method for a pneumatic tire according to any one of claims 1 to 5, wherein a shortest distance between the test tire and the step at the start of the test is 50 mm or less. リム組みした試験タイヤをスリップ角を固定して転動可能に保持するタイヤ保持装置と、延設された段差を有する試験路とを備え、前記タイヤ保持装置と前記試験路との少なくとも一方を前記タイヤ保持装置が保持した試験タイヤのトレッドを前記試験路に接地させる方向に移動可能として、該方向に荷重を負荷できるようにし、前記タイヤ保持装置と前記試験路との少なくとも一方を前記段差の延設方向に移動可能とする空気入りタイヤの試験装置。

A tire holding device that holds the rim-assembled test tire in a rollable manner with a fixed slip angle; and a test road having an extended step, wherein at least one of the tire holding device and the test road is The tread of the test tire held by the tire holding device can be moved in a direction in which the tread is brought into contact with the test road so that a load can be applied in this direction, and at least one of the tire holding device and the test road is extended by the step. A pneumatic tire testing device that can move in the installation direction.

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