JPH05608A - Pneumatic tire - Google Patents
Pneumatic tireInfo
- Publication number
- JPH05608A JPH05608A JP3020106A JP2010691A JPH05608A JP H05608 A JPH05608 A JP H05608A JP 3020106 A JP3020106 A JP 3020106A JP 2010691 A JP2010691 A JP 2010691A JP H05608 A JPH05608 A JP H05608A
- Authority
- JP
- Japan
- Prior art keywords
- pitch
- rib
- tire
- ribs
- elements
- 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.)
- Pending
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
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/0318—Tread patterns irregular patterns with particular pitch sequence
-
- 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
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/0302—Tread patterns directional pattern, i.e. with main rolling direction
-
- 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
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C2011/0337—Tread patterns characterised by particular design features of the pattern
- B60C2011/0386—Continuous ribs
- B60C2011/0388—Continuous ribs provided at the equatorial plane
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tires In General (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、転動に伴って路面とタ
イヤとの間で発生する騒音(パターンノイズ)の聴感上
の音質を改善した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 pneumatic tire in which the audible quality of noise (pattern noise) generated between a road surface and a tire due to rolling is improved.
【0002】[0002]
【従来の技術】従来、パターンノイズを低減するため
に、トレッドパターンを構成するピッチ要素の大きさを
2種類以上とし、このピッチ要素に起因するパルス的騒
音の発生時間間隔を変化させ、特定の周波数帯に騒音が
集中するのを防ぐようにしていた。これは、周波数変調
理論に基づくもので、パターンノイズの次数成分を広い
周波数帯に分散させ、ホワイトノイズ化する手法であ
る。しかしながら、この手法では、パターンノイズの騒
音レベルの低減をはかることはできるが、聴感上の音質
面で“ザワザワ”といった耳障りな音質となることがあ
るので、この手法は必ずしも望ましいものとはいえなか
った。2. Description of the Related Art Conventionally, in order to reduce pattern noise, the size of pitch elements forming a tread pattern is set to two or more, and the time interval of pulse noise caused by these pitch elements is changed to make a specific noise. I tried to prevent noise from concentrating on the frequency band. This is based on the frequency modulation theory and is a method of dispersing the order component of the pattern noise over a wide frequency band to generate white noise. However, although this method can reduce the noise level of pattern noise, it may result in an unpleasant sound quality such as "smoothness" in terms of sound quality in terms of hearing, so this method is not always desirable. It was
【0003】また、特開平 1-282006 号には、この音質
的な欠点を解決する手段として、同一のリブ上のピッチ
配列を等ピッチ配列とした上で、ピッチ数を各リブ毎で
変更させ、各リブから発生する騒音を音楽的な調性を考
慮したピッチ数比で構成することが提案されている。し
かし、この手法では、各リブ間でピッチ要素の剛性差が
大きくなってしまい偏摩耗の懸念が生ずる。Further, in Japanese Patent Laid-Open No. 1-282006, as a means for solving this sound quality defect, the pitch arrangement on the same rib is made equal, and the number of pitches is changed for each rib. It has been proposed to configure the noise generated from each rib with a pitch number ratio in consideration of musical tonality. However, in this method, the difference in rigidity of the pitch elements between the ribs becomes large, which may cause uneven wear.
【0004】[0004]
【発明が解決しようとする課題】本発明は、パターンノ
イズがこのような耳障りな音質となるのを防止するため
になされたものであって、パターンノイズの聴感上の音
質を改良した空気入りタイヤを提供することを目的とす
る。SUMMARY OF THE INVENTION The present invention has been made in order to prevent such pattern noise from causing an unpleasant sound quality, and is a pneumatic tire with improved auditory sound quality of pattern noise. The purpose is to provide.
【0005】[0005]
【課題を解決するための手段】本発明の空気入りタイヤ
は、タイヤ周方向に直線又はジグザグ状の主溝を設ける
ことによりJIS 標準内圧およびJIS標準荷重下における
トレッド接地領域内に2〜8本のリブを形成したタイヤ
であって、これらのリブの幅のうち最大のリブの幅が最
小のリブの幅の1.5 倍以内であり、これらのリブには周
方向長さの異なる複数のピッチ要素が周方向長さが長い
ものから短いものへ及び短いものから長いものへと順に
1個ずつ配列したピッチ要素群を一周期としてタイヤ周
上で数周期繰り返されて配列され、そのように配列され
た各周期を構成するピッチ要素群において、各リブ毎に
その一部又は全部の要素群の周方向長さが最大又は最小
のピッチ要素につき1つに限り追加又は割愛して配列す
ることが許容され、各リブにおけるタイヤ周上のピッチ
要素の配列(以下、順次配列という)が少なくとも2種
以上の次に述べるような条件を満たす配列であることを
特徴とする。Means for Solving the Problems The pneumatic tire of the present invention has a straight or zigzag-shaped main groove in the tire circumferential direction to provide 2 to 8 tires in the tread contact area under JIS standard internal pressure and JIS standard load. The ribs of which the maximum rib width is within 1.5 times the minimum rib width, and these ribs have a plurality of pitch elements with different circumferential lengths. Are arranged by repeating several cycles on the tire circumference with one pitch element group in which the lengths in the circumferential direction are arranged one by one in order from the longest to the shortest and from the shortest to the longest, and arranged in such a manner. In the pitch element group that constitutes each period, it is permissible to add or omit only one pitch element having the maximum or minimum circumferential length of part or all of the element groups for each rib. And each Sequence of pitch elements on the tire circumferential in Bed (hereinafter, sequentially referred sequence) is characterized in that the condition is satisfied sequence as described in at least two or more of the following.
【0006】ここでいう条件とは、タイヤ周上のピッチ
要素の配列が異なるリブ間において、一方のリブにおけ
るピッチ要素の種類数、周期数及び総ピッチ要素数をそ
れぞれi、n、mとし、他方のリブにおけるピッチ要素
の種類数、周期数及び総ピッチ要素数をそれぞれj、
t、Aとしたとき、i、j、n、t、m及びAは自然数
で、iとjは5以上で、nとtは4以上で、mとAは等
しくなく、m±l・n(l=0,1,2,3)とA±k
・t(k=0,1,2,3)とが等しくないことをい
う。The conditions referred to here are, among ribs having different arrangements of pitch elements on the tire circumference, the number of types of pitch elements, the number of cycles and the total number of pitch elements in one rib are i, n and m, respectively. The number of types of pitch elements, the number of cycles, and the total number of pitch elements in the other rib are j,
Assuming t and A, i, j, n, t, m and A are natural numbers, i and j are 5 or more, n and t are 4 or more, m and A are not equal, and m ± l · n (L = 0, 1, 2, 3) and A ± k
-It means that t (k = 0, 1, 2, 3) is not equal.
【0007】また、ここで、ピッチ要素とはピッチ配列
を構成する要素をいい、例えば各リブ上の幅方向溝で区
画されたブロック等をいう。以下、図を参照して本発明
の構成につき詳しく説明する。図1は本発明の空気入り
タイヤのトレッドパターンの一例を示す平面視説明図で
ある。図1において、トレッド表面Tにはタイヤ赤道線
1を中心として左右対称に4本の直線状の主溝2がタイ
ヤ周方向EE’に設けられ、これによりタイヤのJIS 標
準内圧およびJIS 標準荷重下におけるトレッド接地領域
(接地幅W1 )には5本のリブ3,4,5,4,3が形
成されている。主溝2はジグザグ状であってもよい。ま
た、接地幅W1 で示されるトレッド接地領域内には、リ
ブが2〜8本の範囲内で形成される。Here, the pitch element means an element forming a pitch arrangement, for example, a block divided by widthwise grooves on each rib. Hereinafter, the configuration of the present invention will be described in detail with reference to the drawings. FIG. 1 is an explanatory plan view showing an example of a tread pattern of a pneumatic tire of the present invention. In FIG. 1, four linear main grooves 2 are symmetrically provided in the tire circumferential direction EE ′ around the tire equatorial line 1 in the tire tread surface T, so that under the JIS standard internal pressure and JIS standard load of the tire. Five ribs 3, 4, 5, 4, 3 are formed in the tread contact area (contact width W 1 ) in FIG. The main groove 2 may have a zigzag shape. Further, in the tread ground contact area indicated by the ground contact width W 1 , ribs are formed within a range of 2 to 8 ribs.
【0008】これらのリブの幅は、これらのリブの幅が
最大のものが最小のものの1.5 倍以内とする。これは、
各リブのリブ幅の比が大きいと各リブの剛性差が大きく
なって特に耐偏摩耗性が悪化するためである。本実施例
では、リブ3及びリブ4上には周方向における間隔を異
にして幅方向の副溝6、6’が設けられ、該副溝6,
6’によって区切られたブロック7は一つのピッチ要素
として後述するようにタイヤ周方向長さを基準として一
定の順序に従って配列される。リブ3には表1に示すよ
うな配列が施され、リブ4には表2に示すような配列が
施されている。つまりリブ3にはタイヤ周上の全ピッチ
要素数72、ピッチ要素の種類数6、周期数6の順次配
列が施されており、リブ4にはタイヤ周上の全ピッチ要
素数63、ピッチ要素の種類数5、周期数6の順次配列
が施されている。ここで、タイヤ周上の全ピッチ要素
数、ピッチ要素の種類数及び周期数の関係を調整し、後
に述べる本発明の理論的背景を満足させるため、一部の
周期においてタイヤ周方向長さが最小のピッチ要素を一
つだけ追加している。The width of these ribs is within 1.5 times the maximum width of these ribs and the minimum width. this is,
This is because when the ratio of the rib width of each rib is large, the difference in rigidity between the ribs becomes large and the uneven wear resistance is particularly deteriorated. In this embodiment, sub-grooves 6 and 6'in the width direction are provided on the ribs 3 and 4 at different intervals in the circumferential direction.
The blocks 7 divided by 6'are arranged as one pitch element in a predetermined order with reference to the length in the tire circumferential direction as described later. The ribs 3 are arranged as shown in Table 1, and the ribs 4 are arranged as shown in Table 2. That is, the rib 3 is sequentially arranged with the total number of pitch elements 72 on the tire circumference, the number of kinds of pitch elements 6 and the number of cycles 6, and the rib 4 is arranged with the total number of pitch elements 63 on the tire circumference and the pitch elements. The number of types is 5 and the number of cycles is 6 in this order. Here, in order to satisfy the theoretical background of the present invention described later by adjusting the relationship between the total number of pitch elements on the tire circumference, the number of types of pitch elements, and the number of cycles, the tire circumferential direction length in some cycles is Only one minimum pitch element is added.
【0009】図2に本発明の空気入りタイヤのトレッド
パターンの別例を示す。本実施例のトレッド表面Tには
5本の直線状の主溝2がタイヤ周方向EE’に設けら
れ、これによりタイヤのJIS 標準内圧およびJIS 標準荷
重下におけるトレッド接地領域(接地幅W1 )には6本
のリブ10、11、12、13、14、15が形成されている。ま
た、本実施例では、リブ13を除いて各リブに、タイヤ幅
方向に副溝16が設けられ、これによって各リブ上には周
方向長さの異なる複数のブロック17が形成されている。
リブ10および15には表1に示す順次配列が、リブ11およ
び14には表2に示す順次配列が、さらにリブ12には表3
に示す順次配列がそれぞれ施されている。表3に示す順
次配列では、表2に示したものと同様の理由で一部の周
期においてタイヤ周方向長さが最小のピッチ要素を割愛
している。FIG. 2 shows another example of the tread pattern of the pneumatic tire of the present invention. Five linear main grooves 2 are provided in the tire circumferential direction EE 'on the tread surface T of this embodiment, whereby the tread contact area (contact width W 1 ) under the JIS standard internal pressure and JIS standard load of the tire. Six ribs 10, 11, 12, 13, 14, and 15 are formed on the. Further, in this embodiment, each rib except the rib 13 is provided with a sub-groove 16 in the tire width direction, whereby a plurality of blocks 17 having different circumferential lengths are formed on each rib.
The ribs 10 and 15 have the sequence shown in Table 1, the ribs 11 and 14 have the sequence shown in Table 2, and the rib 12 has the sequence shown in Table 3.
The sequential arrangements shown in are respectively applied. In the sequential arrangement shown in Table 3, the pitch element having the minimum tire circumferential length in some cycles is omitted for the same reason as that shown in Table 2.
【0010】本発明において、各リブのリブ配列を少な
くとも2種以上の異なる配列で構成したのは、下記の理
由からである。すなわち、ピッチ要素の種類数i、周期
数n、タイヤ周上の全ピッチ要素数(総ピッチ数)mか
らなる配列のタイヤ転動に伴う時間変動をフーリェ級数
展開するとm±h・n(h:整数)の次数にピークが存
する結果となる。このような配列をトレッド全面で用い
るとピ−クの存する次数の間隔が広いため音質面では
“ザワザワ”という印象は薄くなるが、純音的な音質と
なり、却って耳につき易い結果となってしまう。そこ
で、本発明では、このような欠点を補うため、次数の重
複しない複数のピークを有する2つ以上の配列を、それ
ぞれ異なるリブ上に配することでピークを有する次数の
間隔を狭くして、見かけ上周波数成分をホワイトノイズ
に近づけて純音的な音質となるのを避けたのである。こ
のことを図3、図4、図5に基づき詳しく説明する。In the present invention, the rib arrangement of each rib is made of at least two different arrangements for the following reason. That is, a time series variation due to tire rolling in an array consisting of the number of types of pitch elements i, the number of cycles n, and the total number of pitch elements on the tire circumference (total number of pitches) m is m ± h · n (h The result is that there is a peak in the order of (integer). When such an arrangement is used on the entire tread, the impression of "smoothness" is reduced in terms of sound quality because the intervals of the orders in which the peaks are present are wide, but the sound quality is pure tone and is rather audible. Therefore, in the present invention, in order to compensate for such a drawback, two or more arrays having a plurality of peaks of which the orders do not overlap are arranged on different ribs to narrow the interval of the orders having the peaks, The frequency component was apparently brought close to white noise to avoid a pure tone quality. This will be described in detail with reference to FIGS. 3, 4, and 5.
【0011】図3はピッチ要素の種類数i、周期数n、
総ピッチ数mとした順次配列(1)の転動に伴う時間変
動をフーリェ級数展開したときの次数と振幅の関係を示
す。図4はピッチ要素の種類数j、周期数t、総ピッチ
数Aとした順次配列(2)の転動に伴う時間変動をフー
リェ級数展開したときの次数と振幅の関係を示す。図5
は図3と図4を重ね合わせたものである。図3と図4で
はピークを有する次数の間隔が広いのに比して、図5で
はその間隔が狭くなってよりホワイトノイズに近づいて
いることが判る。FIG. 3 shows the number of types of pitch elements i, the number of periods n,
The relationship between the order and the amplitude when the time series variation due to the rolling of the sequential array (1) with the total pitch number m is expanded into the Fourier series is shown. FIG. 4 shows the relationship between the order and the amplitude when the time series variation due to the rolling of the sequential array (2) with the number j of pitch elements, the number t of cycles, and the total number of pitches A is expanded into a Fourier series. Figure 5
Is a superposition of FIG. 3 and FIG. It can be seen that in FIG. 3 and FIG. 4, the intervals of the orders having peaks are wide, whereas in FIG. 5, the intervals are narrow and the noise is closer to white noise.
【0012】つまり、本発明においては、異なる2つの
順次配列間においてピ−クを発生する次数が重なり合わ
ないようにするため次のような関係を満足することが必
要である。一方のリブにおけるピッチ要素の種類数、周
期数及び総ピッチ要素数をi、n、mとし、他方のリブ
におけるピッチ要素の種類数、周期数及び総ピッチ要素
数をj、t、A としたとき、i,j,n,t,m及び
Aは自然数でiとjは5以上、nとtは4以上であり、
mとAは等しくなく、m±l・n(l=0,1,2,
3)とA±k・t(k=0,1,2,3)とが等しくな
い。このように、ピッチ要素の種類数、周期数及び総ピ
ッチ要素数を規定することによりピ−クを発生する次数
を効果的にずらすことが可能になりパタ−ンノイズの音
圧レベルを大きく変化させることなく、パタ−ンノイズ
の音質を改善することができる。ここでiとjが4以下
又はnとtが3以下となると、フ−リェ級数展開した結
果が十分に集中せず分散してしまい“ザワザワ”とした
音質の原因の一つになり、本発明の狙いとする十分な音
質改善効果を得ることができない。That is, according to the present invention, it is necessary to satisfy the following relationship in order to prevent the orders of generating peaks from overlapping between two different sequential arrays. The number of types of pitch elements, the number of cycles and the total number of pitch elements in one rib are i, n and m, and the number of types of pitch elements, the number of cycles and the total number of pitch elements in the other rib are j, t and A. Where i, j, n, t, m and A are natural numbers, i and j are 5 or more, and n and t are 4 or more,
m and A are not equal, and m ± l · n (l = 0, 1, 2,
3) and A ± k · t (k = 0, 1, 2, 3) are not equal. In this way, by defining the number of types of pitch elements, the number of cycles, and the total number of pitch elements, it is possible to effectively shift the order in which peaks are generated, and the sound pressure level of pattern noise is greatly changed. It is possible to improve the sound quality of pattern noise without the need. Here, when i and j are 4 or less or n and t are 3 or less, the result of the Fourier series expansion is not sufficiently concentrated and dispersed, which is one of the causes of "sawazawa" sound quality. It is not possible to obtain a sufficient sound quality improvement effect that is the object of the invention.
【0013】 注) タイヤ周上の全ピッチ要素数:72。周期 数:6周期。ピッチ要素の種類:6種類、 A>B>C>D>E>F。[0013] Note) Total number of pitch elements on the tire circumference: 72. Number of cycles: 6 cycles. Pitch element types: 6 types, A>B>C>D>E> F.
【0014】 注) タイヤ周上の全ピッチ要素数:63。周期 数:6周期。ピッチ要素の種類:5種類、 A>B>C>D>E。[0014] Note) Total number of pitch elements on the tire circumference: 63. Number of cycles: 6 cycles. Pitch element types: 5 types, A>B>C>D> E.
【0015】 注) タイヤ周上の全ピッチ要素数:68。周期 数:6周期。ピッチ要素の種類:6種類、 A>B>C>D>E>F。[0015] Note) Total number of pitch elements on the tire circumference: 68. Number of cycles: 6 cycles. Pitch element types: 6 types, A>B>C>D>E> F.
【0016】[0016]
【実施例】タイヤサイズ 195/65 R15 でタイヤ構造が同
一の下記の本発明タイヤ1,2及び比較タイヤ1,2を
製造し、これらのタイヤについて騒音レベルの評価及び
音質の官能評価を行った。これらの結果を比較タイヤ2
を基準として指数で図7および図8に示す。数値の大き
い方が良い。[Examples] The following tires 1 and 2 of the present invention and comparative tires 1 and 2 having the same tire structure and tire size 195/65 R15 were manufactured, and the noise level and sensory evaluation of the sound quality of these tires were performed. . These results for comparison tire 2
Is shown as an index in FIGS. 7 and 8. The higher the number, the better.
【0017】 本発明タイヤ1。
図1のトレッドパターンを有する。リブ3には表1に示
す配列が、リブ4には表2に示す配列がそれぞれタイヤ
周上に設けられている。各リブの幅及び各ピッチ要素の
幅方向の溝を含む周方向長さは以下の通り。
リブ3の幅=26mm
リブ4の幅=20mm
リブ5の幅=20mm
リブ3上の各ピッチ要素の周方向長さ:
ピッチ要素A=33.70mm
ピッチ要素B=31.00mm
ピッチ要素C=28.80mm
ピッチ要素D=26.20mm
ピッチ要素E=24.30mm
ピッチ要素F=22.50mm
リブ4上の各ピッチ要素の周方向長さ:
ピッチ要素A=38.80mm
ピッチ要素B=35.20mm
ピッチ要素C=31.50mm
ピッチ要素D=28.70mm
ピッチ要素E=25.85mmThe tire 1 of the present invention. It has the tread pattern of FIG. The rib 3 has the arrangement shown in Table 1, and the rib 4 has the arrangement shown in Table 2 on the tire circumference. The width of each rib and the circumferential length of each pitch element including the groove in the width direction are as follows. Width of rib 3 = 26 mm Width of rib 4 = 20 mm Width of rib 5 = 20 mm Circumferential length of each pitch element on the rib 3: Pitch element A = 33.70 mm Pitch element B = 31.00 mm Pitch element C = 28 .80 mm Pitch element D = 26.20 mm Pitch element E = 24.30 mm Pitch element F = 22.50 mm Circumferential length of each pitch element on the rib 4: Pitch element A = 38.80 mm Pitch element B = 35.20 mm Pitch element C = 31.50 mm Pitch element D = 28.70 mm Pitch element E = 25.85 mm
【0018】 本発明タイヤ2。
図2のトレッドパターンを有する。リブ10及び15には表
1に示す配列が、リブ11及び14には表2に示す配列が、
さらにリブ12には表3に示す配列がそれぞれ施されてい
る。各リブの幅及び各ピッチ要素の周方向長さは以下の
通り。
リブ10の幅=16mm
リブ11の幅=24mm
リブ12の幅=22mm
リブ13の幅=20mm
リブ14の幅=20mm
リブ15の幅=20mm
リブ10及び15上の各ピッチ要素の周方向長さ:
本発明タイヤ1のリブ3と同じ
リブ11及び14上の各ピッチ要素の周方向長さ:
本発明タイヤ1のリブ4と同じ
リブ12上の各ピッチ要素の周方向長さ:
ピッチ要素A=35.30mm
ピッチ要素B=32.50mm
ピッチ要素C=30.10mm
ピッチ要素D=27.50mm
ピッチ要素E=25.40mm
ピッチ要素F=23.55mmThe tire 2 of the present invention. It has the tread pattern of FIG. The ribs 10 and 15 have the arrangement shown in Table 1, and the ribs 11 and 14 have the arrangement shown in Table 2.
Further, the ribs 12 are provided with the arrangements shown in Table 3, respectively. The width of each rib and the circumferential length of each pitch element are as follows. Width of rib 10 = 16 mm Width of rib 11 = 24 mm Width of rib 12 = 22 mm Width of rib 13 = 20 mm Width of rib 14 = 20 mm Width of rib 15 = 20 mm Circumferential length of each pitch element on ribs 10 and 15 Circumferential length of each pitch element on the same ribs 11 and 14 as the rib 3 of the present invention tire 1: Circumferential length of each pitch element on the same rib 12 as the rib 4 of the present invention tire 1: Pitch element A = 35.30 mm Pitch element B = 32.50 mm Pitch element C = 30.10 mm Pitch element D = 27.50 mm Pitch element E = 25.40 mm Pitch element F = 23.55 mm
【0019】 比較タイヤ1。
図6のトレッドパターンを有する。図6では、図1にお
けると同様に、トレッド表面Tにはタイヤ赤道線1を中
心として左右対称に4本の直線状の主溝2がタイヤ周方
向EE’に設けられ、これによりJIS 標準内圧およびJI
S 標準荷重下でのトレッド接地領域(接地幅W1 )には
5本のリブ3,4,5,4,3が形成されている。リブ
3,4にはタイヤ幅方向副溝6により複数のブロック7
が形成され、タイヤ周上には表1に示す配列が施されて
いる。Comparative tire 1. It has the tread pattern of FIG. In FIG. 6, as in FIG. 1, four linear main grooves 2 are symmetrically provided in the tire circumferential direction EE ′ around the tire equatorial line 1 on the tread surface T, whereby the JIS standard internal pressure is applied. And JI
S Five ribs 3, 4, 5, 4, 3 are formed in the tread contact area (contact width W 1 ) under standard load. A plurality of blocks 7 are formed on the ribs 3 and 4 by the auxiliary groove 6 in the tire width direction.
Are formed, and the arrangement shown in Table 1 is provided on the tire circumference.
【0020】各リブの幅及び各ピッチ要素の周方向長さ
は以下の通り。
リブ3,4,5の幅:
本発明タイヤ1と同じ
リブ3,4上の各ピッチ要素の周方向長さ:
本発明タイヤ1のリブ3と同じThe width of each rib and the circumferential length of each pitch element are as follows. Width of the ribs 3, 4, 5: Same as the tire 1 of the present invention. Length of each pitch element on the ribs 3, 4 in the circumferential direction: Same as rib 3 of the tire 1 of the present invention.
【0021】 比較タイヤ2。
比較タイヤ1とはピッチ配列を異にするがトレッドパタ
ーンを同様とする。リブ3,4には表4に示す従来の考
え方によるピッチ配列がタイヤ周上に設けられている。
各ピッチ要素の周方向長さは以下の通り。リブ3,4上
の各ピッチ要素の周方向長さ:
ピッチ要素A=32.10mm
ピッチ要素B=27.50mm
ピッチ要素C=24.40mmComparative tire 2. Although the pitch arrangement is different from that of the comparative tire 1, the tread pattern is the same. The ribs 3 and 4 are provided with a pitch arrangement according to the conventional idea shown in Table 4 on the tire circumference.
The circumferential length of each pitch element is as follows. Circumferential length of each pitch element on the ribs 3 and 4: Pitch element A = 32.10 mm Pitch element B = 27.50 mm Pitch element C = 24.40 mm
【0022】
注)
タイヤ周上の全ピッチ要素数:72
ピッチ要素の種類:3種類
A>B>C。
騒音レベルの評価は、国産2000ccのFR車(前部機関後
輪駆動車)にタイヤを装着し、50km/ h の速度で定常走
行させ、そのときの車室内中央位置での騒音レベルを測
定することによった。また、音質の官能評価は、この騒
音レベルの測定に際して同乗した3名のパネラーによる
フィーリングにて5段階評価することによった。これら
の結果を図7および図8に示す。また、各パネラーの音
質に関するコメントを表5に示す。[0022] Note) The total number of pitch elements on the tire circumference: 72 Types of pitch elements: 3 types A>B> C. The noise level is evaluated by mounting tires on a domestic 2000cc FR vehicle (front engine rear wheel drive vehicle) and running it at a constant speed of 50km / h, and then measuring the noise level at the center of the passenger compartment. It depends. The sensory evaluation of the sound quality was based on the five-level evaluation by the feeling of three panelists who were on board when measuring the noise level. The results are shown in FIGS. 7 and 8. Table 5 shows the comments regarding the sound quality of each panel.
【0023】
図7、図8、および表5から判るように、本発明タイヤ
1,2は騒音レベルでは比較タイヤ1,2と大差はない
が、官能評価による音質の評価点は高くなっており、音
質が改善されている。このことは、各パネラーの音質に
関するコメントからも裏付けられる。[0023] As can be seen from FIGS. 7 and 8 and Table 5, the tires 1 and 2 of the present invention are not so different in noise level from the comparative tires 1 and 2, but the evaluation point of the sound quality by sensory evaluation is high, and the sound quality is high. Has been improved. This is supported by comments on the sound quality of each panelist.
【0024】[0024]
【発明の効果】以上説明したように本発明によれば、タ
イヤ周方向に直線状又はジグザグ状の主溝を設けること
により、タイヤのJIS 標準内圧およびJIS 標準荷重下に
おけるトレッド接地領域内に2〜8本のリブを形成し、
これらのリブ幅のうち最大のリブ幅が最小リブの幅の
1.5倍以内の範囲とし、前記各リブにおけるタイヤ周
上のピッチ要素の配列が少なくとも2種以上の異なる順
次配列を配したので、パターンノイズの聴感上の音質を
改良することが可能となる。As described above, according to the present invention, the straight or zigzag-shaped main groove is provided in the tire circumferential direction so that the tread contact area under the JIS standard internal pressure and JIS standard load of the tire is 2 Form ~ 8 ribs,
Of these rib widths, the maximum rib width is within a range of 1.5 times the minimum rib width, and at least two or more different pitch elements are arranged on the tire circumference in each rib. It is possible to improve the audible sound quality of pattern noise.
【図1】本発明の空気入りタイヤのトレッドパターンの
一例を示す平面視説明図である。FIG. 1 is an explanatory plan view showing an example of a tread pattern of a pneumatic tire of the present invention.
【図2】本発明の空気入りタイヤのトレッドパターンの
一例を示す平面視説明図である。FIG. 2 is an explanatory plan view showing an example of the tread pattern of the pneumatic tire of the present invention.
【図3】順次配列の次数と振幅との関係図である。FIG. 3 is a relationship diagram between the order and the amplitude of a sequential array.
【図4】順次配列の次数と振幅との関係図である。FIG. 4 is a relationship diagram between the order and the amplitude of a sequential array.
【図5】順次配列の次数と振幅との関係図である。FIG. 5 is a relationship diagram between the order and the amplitude of a sequential array.
【図6】比較タイヤのトレッドパターンを示す平面視説
明図である。FIG. 6 is an explanatory plan view showing a tread pattern of a comparative tire.
【図7】各種タイヤの騒音レベルを示す説明図である。FIG. 7 is an explanatory diagram showing noise levels of various tires.
【図8】各種タイヤの音質の官能評価を示す説明図であ
る。FIG. 8 is an explanatory diagram showing a sensory evaluation of sound quality of various tires.
1 タイヤ赤道線、2 主溝、3 リブ、4 リブ、5
リブ、6 副溝、7 ブロック。1 tire equatorial line, 2 main grooves, 3 ribs, 4 ribs, 5
Ribs, 6 minor grooves, 7 blocks.
Claims (2)
溝を設けることによりJIS 標準内圧およびJIS 標準荷重
下におけるトレッド接地領域内に2〜8本のリブを形成
したタイヤであって、これらのリブの幅のうち最大のリ
ブの幅が最小のリブの幅の1.5 倍以内であり、これらの
リブには、周方向長さの異なる複数のピッチ要素が周方
向長さが長いものから短いものへ及び短いものから長い
ものへと順に1個ずつ配列したピッチ要素群を一周期と
して、タイヤ周上で数周期繰り返されて配列され、その
ように配列された各周期を構成するピッチ要素群におい
て、各リブ毎にその一部又は全部の要素群の周方向長さ
が最大又は最小のピッチ要素につき1つに限り追加又は
割愛して配列することが許容され、各リブにおけるタイ
ヤ周上のピッチ要素の配列が、少なくとも2種以上の異
なる配列であることを特徴とする空気入りタイヤ。1. A tire in which 2 to 8 ribs are formed in a tread contact area under JIS standard internal pressure and JIS standard load by providing straight or zigzag-shaped main grooves in the tire circumferential direction. The maximum rib width within the rib width is less than 1.5 times the minimum rib width, and these ribs have multiple pitch elements with different circumferential lengths from long circumferential lengths to short circumferential lengths. In the pitch element group which is arranged by repeating several cycles on the tire circumference, with one pitch element group arranged in order from the shortest one to the longest one as one cycle, and which constitutes each cycle so arranged. It is permissible to add or omit only one pitch element having a maximum or minimum pitch length in the circumferential direction of a part or all of the element groups for each rib, and to arrange the pitch of each rib on the tire circumference. Arrangement of elements A pneumatic tire characterized in that the rows are at least two or more different arrangements.
リブ間において、一方のリブにおけるピッチ要素の種類
数、周期数及び総ピッチ要素数をそれぞれi、n、mと
し、他方のリブにおけるピッチ要素の種類数、周期数及
び総ピッチ要素数をそれぞれj、t、Aとしたとき、
i,j,n,t,m及びAは自然数で、iとjは5以上
で、nとtは4以上で、mとAは等しくなく、m±l・
n(l=0,1,2,3)とA±k・t(k=0,1,
2,3)とが等しくない請求項1の空気入りタイヤ。2. Among ribs having different arrangements of pitch elements on the tire circumference, the number of types of pitch elements, the number of cycles and the total number of pitch elements in one rib are i, n and m respectively, and the pitch in the other rib is When the number of element types, the number of cycles, and the total number of pitch elements are j, t, and A, respectively,
i, j, n, t, m and A are natural numbers, i and j are 5 or more, n and t are 4 or more, m and A are not equal, and m ± l ·
n (l = 0, 1, 2, 3) and A ± k · t (k = 0, 1,
The pneumatic tire according to claim 1, wherein (2, 3) are not equal to each other.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3020106A JPH05608A (en) | 1991-02-13 | 1991-02-13 | Pneumatic tire |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3020106A JPH05608A (en) | 1991-02-13 | 1991-02-13 | Pneumatic tire |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH05608A true JPH05608A (en) | 1993-01-08 |
Family
ID=12017866
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3020106A Pending JPH05608A (en) | 1991-02-13 | 1991-02-13 | Pneumatic tire |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH05608A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000219013A (en) * | 1999-01-28 | 2000-08-08 | Yokohama Rubber Co Ltd:The | Pneumatic radial tire |
JP2006240592A (en) * | 2005-03-07 | 2006-09-14 | Yokohama Rubber Co Ltd:The | Pneumatic tire |
JP2009214796A (en) * | 2008-03-12 | 2009-09-24 | Bridgestone Corp | Apparatus and method for estimating road surface state |
JP2011203017A (en) * | 2010-03-24 | 2011-10-13 | Bridgestone Corp | Method of estimating road surface condition |
US20120145294A1 (en) * | 2010-12-09 | 2012-06-14 | Yoshiaki Takemoto | Pneumatic tire |
US10259669B2 (en) | 2015-10-09 | 2019-04-16 | Totani Corporation | Sheet product supplying apparatus |
-
1991
- 1991-02-13 JP JP3020106A patent/JPH05608A/en active Pending
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000219013A (en) * | 1999-01-28 | 2000-08-08 | Yokohama Rubber Co Ltd:The | Pneumatic radial tire |
JP2006240592A (en) * | 2005-03-07 | 2006-09-14 | Yokohama Rubber Co Ltd:The | Pneumatic tire |
JP4639859B2 (en) * | 2005-03-07 | 2011-02-23 | 横浜ゴム株式会社 | Pneumatic tire |
JP2009214796A (en) * | 2008-03-12 | 2009-09-24 | Bridgestone Corp | Apparatus and method for estimating road surface state |
JP2011203017A (en) * | 2010-03-24 | 2011-10-13 | Bridgestone Corp | Method of estimating road surface condition |
US20120145294A1 (en) * | 2010-12-09 | 2012-06-14 | Yoshiaki Takemoto | Pneumatic tire |
US9242511B2 (en) * | 2010-12-09 | 2016-01-26 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire with tread having pitch Pm > pitch Pc > pitch Ps |
US10259669B2 (en) | 2015-10-09 | 2019-04-16 | Totani Corporation | Sheet product supplying apparatus |
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