JPH01289705A - Pneumatic tire with reduced noise - Google Patents

Pneumatic tire with reduced noise

Info

Publication number
JPH01289705A
JPH01289705A JP63118087A JP11808788A JPH01289705A JP H01289705 A JPH01289705 A JP H01289705A JP 63118087 A JP63118087 A JP 63118087A JP 11808788 A JP11808788 A JP 11808788A JP H01289705 A JPH01289705 A JP H01289705A
Authority
JP
Japan
Prior art keywords
tread
tire
circumferential
length
axial direction
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
Application number
JP63118087A
Other languages
Japanese (ja)
Inventor
Hideki Yokoyama
英樹 横山
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bridgestone Corp
Original Assignee
Bridgestone Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bridgestone Corp filed Critical Bridgestone Corp
Priority to JP63118087A priority Critical patent/JPH01289705A/en
Publication of JPH01289705A publication Critical patent/JPH01289705A/en
Pending legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60CVEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03Tread patterns
    • B60C11/0318Tread patterns irregular patterns with particular pitch sequence

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)

Abstract

PURPOSE:To reduce noise due to vibration and resonance by forming notches extending in the axial direction of a tire, at least over tread elements with longer pitches, and having the circumferential rigidity of a plural number of tread element mutually get closer. CONSTITUTION:Numerous tread elements A-C arranged in turn in the circumferential direction Y of a tire have may circumferential grooves 1a-1c continuous in the circumferential direction, many axial direction grooves 2a-2c discontinuous in the axial direction and land sections 3a-3c divided by them. In this case, respective notches 4a-4c are formed in respective land sections 3a-3c, with at least one notch inclined in the axial direction. And as for the length of respective notches 4a-4c, the notch 4a in the tread element A with the shortest pitch length l is made the shortest and respective notches 4b and 4c in respective tread elements B and C are made longer in that order.

Description

【発明の詳細な説明】 [発明の目的] (産業上の利用分野) 本発明はピッチバリエーションを施したタイヤの各トレ
ッドエレメントの周方向剛性を均一化したことにより、
走行時のノイズ発生を低減しなタイヤに関するものであ
る。
[Detailed Description of the Invention] [Object of the Invention] (Industrial Field of Application) The present invention is characterized by equalizing the circumferential stiffness of each tread element of a tire with pitch variations.
This invention relates to a tire that reduces noise generation during driving.

(従来の技術) タイヤが走行中に発生するノイズはタイヤのトレッドと
路面の間において、トレッドのエレメントを区分する溝
から排出される空気に基づく音が主である。
(Prior Art) The noise generated while a tire is running is mainly caused by air discharged from the grooves separating the tread elements between the tire tread and the road surface.

即ち、空気流中に気体の吹出し、あるいは吹込みがある
場合、それらの強さが非定常であれば、そのまわりの空
気はそれに伴って圧縮、肋膜の振動が生じる。そしてそ
のエネルギーの1部が音とみなって輻射する。
That is, when there is a blow-out or blow-in of gas in an air flow, if the strength of the blow is unsteady, the surrounding air is compressed and the pleura vibrates. A portion of that energy is then radiated as sound.

通常タイヤのトレッドは良く知られているように周方向
に延びるジグザグ状溝を軸方向に間隔をおいて複数配置
し、これらの溝によって区分されるリブからなるリブタ
イプ、周方向に延びるジグザグ状溝または実質上ストレ
ートの溝等を軸方向に間隔を置いて配置した複数の溝と
、これらと交わる向きに多数設けた横溝によって区分さ
れたブロックから成るブロックタイプ及び多数の横溝を
周上に設けてラグを区分してなるラグタイプに大別する
ことができる。
As is well known, the tread of a normal tire has a plurality of zigzag grooves extending in the circumferential direction arranged at intervals in the axial direction, and there are two types: rib type, which consists of ribs separated by these grooves, and zigzag grooves extending in the circumferential direction. Or, a block type consisting of a block divided by a plurality of substantially straight grooves arranged at intervals in the axial direction and a large number of lateral grooves provided in the direction intersecting these grooves, and a block type with a large number of lateral grooves provided on the circumference. Rugs can be roughly divided into rug types.

タイヤが走行すると、タイヤの回転に伴い接地面内にお
いてリブ、ブロックあるいはラグの講中の空気が振動す
るので、前記トレッドを構成するエレメント(リブタイ
プの場合はジグザグのある山から周方向における次の山
までの間。ブロック及びラグの場合は個々のブロックま
たはラグ)が1秒間に何回接地するかによって音の高さ
、つまり周波数が決まり、ある高さの音となって人の耳
に入る訳であるが、仮にトレッドが単一のピッチ長さの
エレメントでリブ、ブロックあるいはラグが構成されて
いるとすれば、接地面を1秒間に通過するエレメントの
数及びその0倍に相当する周波数の中の何れかが耳ぎわ
すなノイズとして聞こえる。
When the tire runs, the air in the ribs, blocks, or lugs vibrates within the contact patch as the tire rotates, so the elements that make up the tread (in the case of a rib type, from one zigzag peak to the next in the circumferential direction) The distance to the mountain (in the case of blocks and lugs, individual blocks or lugs) determines the pitch, or frequency, of the sound depending on how many times it touches the ground per second, and the sound reaches the human ear at a certain pitch. For example, if the tread is composed of ribs, blocks, or lugs made of elements with a single pitch length, then the number of elements that pass over the ground plane in one second and the frequency equivalent to 0 times that number. Something inside can be heard as an annoying noise.

このようなノイズを抑制するには、通常周波数変調理論
などに基くピッチバリエーションの手法、即ち、異なる
複数のピッチ長さ(通常1〜1.8のピッチ比、2種類
以上)のエレメントをトレッドの周上にランダムまたは
疑似ランダムに配置することにより、特定の周波数を分
散させて気にならない音にすることがなされてきた。
To suppress such noise, pitch variation methods based on frequency modulation theory are usually used, in other words, elements with different pitch lengths (usually 1 to 1.8 pitch ratio, two or more types) are used in the tread. By arranging them randomly or pseudo-randomly on the circumference, it has been possible to disperse specific frequencies and make the sound unobtrusive.

(発明が解決しようとする課題) トレッドのリブ及びブロック等にピッチバリエーション
を施した場合、周波数が高いノイズの低減については効
果的である。しかしながらピッチ長さが異なるエレメン
トをトレッドの周上に混合配列する関係上、接地面内に
おいて周方向の力が路面との間に作用したとき、ピッチ
長さが長いエレメントに対し、ピッチ長さがより短いエ
レメントは、より大きい周方向の変形が生じる。周上に
配列されたエレメント毎にこのような変形が生じると走
行時において、接地面をトレッドのエレメントが通過す
るときエレメントの周方向変形の大小、即ち周方向剛性
の大小の変動は、振動となり、車体を構成する種々の部
材と共振することによりビート音(5H2前後)の原因
となる。
(Problems to be Solved by the Invention) When pitch variations are applied to the ribs and blocks of the tread, it is effective in reducing high frequency noise. However, due to the fact that elements with different pitch lengths are arranged in a mixed manner on the circumference of the tread, when a circumferential force is applied between the ground contact surface and the road surface, the pitch length is Shorter elements experience greater circumferential deformation. If such deformation occurs in each element arranged on the circumference, when the tread elements pass through the ground contact surface during running, the magnitude of the circumferential deformation of the elements, that is, the variation in the circumferential rigidity, will result in vibration. , which causes a beat sound (around 5H2) by resonating with various members that make up the vehicle body.

したがって、タイヤ周方向にエレメント長さの異なるト
レッドエレメントを配置した、いわゆるピッチバリエー
ションを施したタイヤにおける各エレメントの周方向剛
性をいかにして均一化し、振動音を解消することにより
、ノイズを低減した空気入りタイヤを提供するかが本発
明の課題となっている。
Therefore, in a tire with so-called pitch variation, in which tread elements with different element lengths are arranged in the circumferential direction, the circumferential stiffness of each element can be made uniform, and vibration noise can be eliminated to reduce noise. The problem of the present invention is to provide a pneumatic tire.

[発明の構成] (課題を解決するための手段) 上記課題を解決するため、本発明は複数の清によって区
分された隆部を備え、この隆部が少なくとも2種のピッ
チ長さのエレメントを多数周方向に配列したトレッドを
有するタイヤにおいて、少なくとも上記ピッチ長さがよ
り長いトレッドエレメントに、ほぼタイヤの軸方向に延
びる少なくとも1個の切込みを配置することにより、該
エレメントの周方向剛性をより短いトレッドエレメント
のそれに近づけたことを特徴とする (作用) いわゆるピッチバリエーションを施しているため、一定
周波数のノイズ発生を抑制できる一方、ピッチ長さに応
じた長さの切込みを設けたので、ピッチバリエーション
による周方向剛性のばらつきがなくなり、均一化される
。その結果、振動、共鳴によるノイズを低減できる。
[Structure of the Invention] (Means for Solving the Problems) In order to solve the above problems, the present invention includes a ridge portion divided by a plurality of pitches, and the ridge portion includes elements having at least two types of pitch lengths. In a tire having a plurality of treads arranged circumferentially, at least one notch extending substantially in the axial direction of the tire is arranged in at least the tread element having the longer pitch length, thereby increasing the circumferential rigidity of the element. It is characterized by being close to that of a short tread element (effect) Since it has so-called pitch variation, it is possible to suppress the generation of noise at a constant frequency. Variations in circumferential stiffness due to variations are eliminated and made uniform. As a result, noise due to vibration and resonance can be reduced.

(実施例) 以下、図面を参照して本発明を説明する。(Example) The present invention will be described below with reference to the drawings.

第1図は本発明のタイヤの接地面パターンを示す平面図
である。
FIG. 1 is a plan view showing the contact patch pattern of the tire of the present invention.

この図は3種のトレッドエレメントA、B、Cをタイヤ
周方向Yに向かって順次配列した例である。各トレッド
エレメントA、B、Cは周方向に連続した4本の周方自
消1a、la、lb、lb、軸方向へ不連続の5本の軸
方自消2a〜2Cを有し、これらに区画された隆部くブ
ロック>3a〜3Cを有している。トレッドエレメント
Aは周方向の長さ、つまりピッチ長さが最も短く、これ
を丈とするとエレメントBは1.13fL、エレメント
Cは1゜33!Lと夫々ピッチ長さを有する。
This figure shows an example in which three types of tread elements A, B, and C are sequentially arranged in the tire circumferential direction Y. Each tread element A, B, and C has four circumferential self-extinguishing elements 1a, la, lb, and lb that are continuous in the circumferential direction and five axial self-extinguishing elements 2a to 2C that are discontinuous in the axial direction. It has ridges divided into blocks>3a to 3C. Tread element A has the shortest length in the circumferential direction, that is, the pitch length, and if this is taken as the length, element B is 1.13 fL, and element C is 1°33! L and pitch length, respectively.

中央陸部列を除く陸部列における各隆部(ブロック)に
は夫々サイズまたは切込み4a〜4cが1本軸方向に傾
斜して切込まれている。中央陸部列における各隆部又は
ブロックには夫々4個宛切込みを具えている。各切込み
は陸部のピッチ長さに応じ長さが長い切込みの幅は、凡
そ0.7mm前後である。
Each ridge (block) in the land row except for the central land row has one size or cut 4a to 4c inclined in the axial direction. Each ridge or block in the central land column is provided with four notches. Each cut has a long length depending on the pitch length of the land portion, and the width of the long cut is approximately 0.7 mm.

この切込み4a 、4b 、4Cの長さは、ピッチ長さ
吏の最も短いトレッドエレメントAの切込み4aが最も
雉く、順次B、Cの4b 、4Cの順に長くなっている
。つまり切込み4の長さはピッチ長さ愛に応じて変化し
ている。
Regarding the lengths of the cuts 4a, 4b, and 4C, the cut 4a of the tread element A, which has the shortest pitch length, is the longest, and the cuts 4b and 4C of the tread element B and C become longer in this order. In other words, the length of the notch 4 changes depending on the pitch length.

本発明のタイヤを周方向に見れば陸部のブロック長さ(
エレメントのピッチ長さ)の異なるブロックが任意に配
置されていることになり、これによって、音の周波数が
分散され、ノイズを低減することになる。
When looking at the tire of the present invention in the circumferential direction, the block length of the land portion (
Blocks with different element pitch lengths are arbitrarily arranged, thereby dispersing sound frequencies and reducing noise.

一方、ブロック長さに比例して周方向の剛性は変化する
が、このばらつきを均一化するために、ブロック長さに
応じた長さの切込みをブロックに入れる。
On the other hand, the rigidity in the circumferential direction changes in proportion to the block length, but in order to equalize this variation, a cut with a length corresponding to the block length is made in the block.

この切込みの長さとブロックの大きさの関係について、
以下に考察する。
Regarding the relationship between the length of this cut and the size of the block,
This is discussed below.

第2図に示す1個のブロックを想定したとき、長さ誌、
幅Wのブロックの周方向Yの力に対するブロックの倒れ
込み(タイヤが回転して接地する際のブロックの周方向
歪み)に対する剛性は、このブロックの断面二次モーメ
ントに比例し、下式%式% このブロックが接地長さSの踏面内に並んでいる時、踏
面内にあるブロック数はS/fLであるから、踏面内の
周方向剛性Pは で表わされる。
Assuming one block shown in Figure 2, the length magazine,
The rigidity of a block of width W against a force in the circumferential direction Y that causes the block to collapse (distortion in the circumferential direction of the block when the tire rotates and touches the ground) is proportional to the moment of inertia of this block, and is expressed by the following formula: % When these blocks are lined up in a tread with a ground contact length S, the number of blocks in the tread is S/fL, so the circumferential rigidity P in the tread is expressed as.

ここで、長ピツチエレメントのブロック長さをklとし
、このブロックに幅比dで周方向に対する切込みをm個
人れる。この切込みの入った長ピツチブロックの断面二
次モーメントは下記となる。
Here, the block length of the long pitch element is kl, and m cuts in the circumferential direction are made in this block with a width ratio d. The moment of inertia of this long pitch block with notches is as follows.

ただし、ここでd=t/W、t =it +t2、切込
みによるブロックの分割数n=m+1である。
However, here, d = t/W, t = it + t2, and the number of block divisions by incision n = m+1.

(なおmはブロック内の周方向における切込み個数、第
2図はY方向のどの線を引いても交わる切込みは1本で
あるからm=1である) 上式(3)式で、第1項はブロックの幅方向に切込みが
はいっていない部分の剛性、第2項は切込みによりn個
に分割された部分の剛性を示している。
(In addition, m is the number of cuts in the circumferential direction within the block, and in Figure 2, no matter which line is drawn in the Y direction, there is only one cut that intersects, so m = 1.) In the above formula (3), the first The term represents the stiffness of the portion of the block that is not cut in the width direction, and the second term represents the stiffness of the portion that is divided into n pieces by the cut.

式を整理すれば、 Ak= となり、接地長Sでの周方向剛性Pkは下式となる。If you rearrange the formula, Ak= Therefore, the circumferential rigidity Pk at the ground contact length S is given by the following formula.

Pk =Ak x − に斐 ここで、短ピツチと長ピツチでの接地面内剛性を等しく
すると、上記(2)式P=上記(5)弐Pkとなり、こ
れをdについて解くと下式が得られる。
Pk = Ak It will be done.

第3図に示すA〜EのパターンのエレメントをA−A−
A−B−C−D−E−E−E−D−C−B−A−B−B
−C−D−E−E−E−D−C−B−A−A−A−B−
C−C−D−D−E−D−Cの順で周方向に一周期中に
配列した、タイヤサイズ195/60R14、内圧1.
9、荷重4ookgのタイヤを用意した。
A-A-
A-B-C-D-EE-E-D-C-B-A-B-B
-C-D-E-E-E-D-C-B-A-A-A-B-
Tire size 195/60R14, internal pressure 1.
9. A tire with a load of 4ookg was prepared.

ここで各エレメントのピッチは A:B:COD:E=吏:1.15吏:1.31:1.
45吏: 1.6愛 各切込みの幅比d(=t/w)は A:B:C:D:E=0:0.33:0.54コニQ、
7:0.81である。
Here, the pitch of each element is A:B:COD:E=R:1.15R:1.31:1.
45: 1.6 Ai The width ratio d (=t/w) of each cut is A: B: C: D: E = 0: 0.33: 0.54 Koni Q,
7:0.81.

このタイヤ(3本)について、速度80km/hrで前
後方向の力の変動(TFV)を測定し、その結果を第4
図に示した。比較のため、切込みのないタイヤ(3本)
についての測定結果を第5図に示した。
For these tires (3 tires), the longitudinal force fluctuation (TFV) was measured at a speed of 80 km/hr, and the results were
Shown in the figure. For comparison, tires without cuts (3 tires)
The measurement results are shown in Figure 5.

本発明品の第5図は第4図に比べ、明らかにTFVのピ
ークが消滅している。
In FIG. 5 of the product of the present invention, compared to FIG. 4, the TFV peak clearly disappears.

[発明の効果] 本発明は上述したように構成したから、次の効果を奏す
る。
[Effects of the Invention] Since the present invention is configured as described above, the following effects are achieved.

(1)いわゆるピッチバリエーションを施しているため
、一定周波数のノイズ発生を抑制できる。
(1) Since so-called pitch variations are applied, the generation of noise at a constant frequency can be suppressed.

(2)ピッチ長さに応じた長さの切込みを設けなので、
ピッチバリエーションによる周方向剛性のばらつきがな
くなり、均一化される。その果、振動、共鳴によるノイ
ズを低減できる。
(2) Since the notch is provided with a length that corresponds to the pitch length,
Variations in circumferential stiffness due to pitch variations are eliminated and made uniform. As a result, noise caused by vibration and resonance can be reduced.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明のタイヤの接地面の平面図、第2図はブ
ロックの説明図、第3図は本発明実施例におけるタイヤ
接地面の平面図、第4図は実施例における次数とTFV
の関係を示すグラフ、第5図は比較例における次数とT
FVの関係を示すグラフである。 1・・・周方向溝     2・・・軸方同情3・・・
陸部       4・・・切込みA、B、C・・・ト
レッドエレメント 代理人 弁理士  三 好 保 男 TFV(kq) TFV(ko)
FIG. 1 is a plan view of the contact surface of the tire of the present invention, FIG. 2 is an explanatory diagram of the block, FIG. 3 is a plan view of the tire contact surface in the embodiment of the present invention, and FIG. 4 is the order and TFV in the embodiment.
Figure 5 is a graph showing the relationship between the order and T in the comparative example.
It is a graph showing the relationship between FV. 1... Circumferential groove 2... Axial symmetry 3...
Rikube 4... Cuts A, B, C... Tread element representative Patent attorney Yasuo Miyoshi TFV (kq) TFV (ko)

Claims (1)

【特許請求の範囲】[Claims]  複数の溝によって区分された陸部を備え、この陸部が
少なくとも2種のピッチ長さのエレメントを多数周方向
に配列したトレッドを有するタイヤにおいて、少なくと
も上記ピッチ長さがより長いトレッドエレメントに、ほ
ぼタイヤの軸方向に延びる少なくとも1個の切込みを配
置することにより、該エレメントの周方向剛性をより短
いトレッドエレメントのそれに近づけたことを特徴とす
るノイズを低減した空気入りタイヤ。
In a tire having a tread including a land portion divided by a plurality of grooves, and in which the land portion has a large number of elements having at least two types of pitch lengths arranged in the circumferential direction, at least the tread element having the longer pitch length, A pneumatic tire with reduced noise, characterized in that the circumferential stiffness of the element is brought closer to that of a shorter tread element by arranging at least one notch extending substantially in the axial direction of the tire.
JP63118087A 1988-05-17 1988-05-17 Pneumatic tire with reduced noise Pending JPH01289705A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63118087A JPH01289705A (en) 1988-05-17 1988-05-17 Pneumatic tire with reduced noise

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63118087A JPH01289705A (en) 1988-05-17 1988-05-17 Pneumatic tire with reduced noise

Publications (1)

Publication Number Publication Date
JPH01289705A true JPH01289705A (en) 1989-11-21

Family

ID=14727673

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63118087A Pending JPH01289705A (en) 1988-05-17 1988-05-17 Pneumatic tire with reduced noise

Country Status (1)

Country Link
JP (1) JPH01289705A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0612631A1 (en) * 1993-02-17 1994-08-31 Bridgestone Corporation Method of manufacturing a pneumatic tire

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6127708A (en) * 1984-07-16 1986-02-07 Sumitomo Rubber Ind Ltd Pneumatic tire
JPS61169302A (en) * 1985-01-23 1986-07-31 Yokohama Rubber Co Ltd:The Pneumatic tire

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6127708A (en) * 1984-07-16 1986-02-07 Sumitomo Rubber Ind Ltd Pneumatic tire
JPS61169302A (en) * 1985-01-23 1986-07-31 Yokohama Rubber Co Ltd:The Pneumatic tire

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0612631A1 (en) * 1993-02-17 1994-08-31 Bridgestone Corporation Method of manufacturing a pneumatic tire

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