JP3090984B2 - Pneumatic tires for heavy loads - Google Patents
Pneumatic tires for heavy loadsInfo
- Publication number
- JP3090984B2 JP3090984B2 JP03213925A JP21392591A JP3090984B2 JP 3090984 B2 JP3090984 B2 JP 3090984B2 JP 03213925 A JP03213925 A JP 03213925A JP 21392591 A JP21392591 A JP 21392591A JP 3090984 B2 JP3090984 B2 JP 3090984B2
- Authority
- JP
- Japan
- Prior art keywords
- tire
- circumferential
- side edges
- ingredient
- component
- 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.)
- Expired - Fee Related
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
- B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
- B60C11/1204—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special shape of the sipe
- B60C2011/1213—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special shape of the sipe sinusoidal or zigzag at the tread surface
Landscapes
- Tires In General (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ワンダリング性能と耐
横すべり性能を向上した重荷重用空気入タイヤに関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heavy-duty pneumatic tire having improved wandering performance and skid resistance.
【０００２】[0002]
【従来の技術】雪路、氷路等の制動性を向上するため、
最近の重荷重用タイヤは、実接地面積をアップするため
にトレッド幅を広くするとともに、センターブロック、
サイドブロックの稜線形状を階段状に形成し、ショルダ
ーブロックの面積を大きく形成している (例えば特開平
２−31902 号参照) 。2. Description of the Related Art In order to improve braking performance on snowy and icy roads,
Recent heavy duty tires have wide treads to increase the actual ground contact area,
The ridge line shape of the side block is formed in a step shape, and the area of the shoulder block is made large (see, for example, JP-A-2-31902).
【０００３】[0003]
【発明が解決しようとする課題】しかし、従来のショル
ダーブロックにおけるタイヤ軸方向外側縁の稜線形状
は、階段状ではないため、凹凸のある雪氷路における轍
内でのワンダリング性能の低下を招いていた。このた
め、ショルダーブロックの稜線部分を、タイヤ断面方向
に関して面取りすることで、ある程度の轍内においてワ
ンダリング性能を改善できるもののコーナリング時の耐
横すべり性能が低下していた。However, the ridge shape of the outer edge of the conventional shoulder block in the axial direction of the tire is not stair-shaped, which leads to a decrease in wandering performance in a rut on a snowy and icy road having irregularities. Was. For this reason, by chamfering the ridge portion of the shoulder block in the cross-sectional direction of the tire, wandering performance can be improved within a certain rut, but skid resistance during cornering has been reduced.
【０００４】本発明は、叙述の実状に鑑み、ワンダリン
グ性能と耐横すべり性能をともに向上した重荷重用空気
入タイヤを提供するのが目的である。The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a pneumatic tire for heavy load having improved wandering performance and anti-skid performance.
【０００５】[0005]
【課題を解決するための手段】本発明は、タイヤのトレ
ッド部に、周方向溝1 及び軸方向溝2 で囲まれたショル
ダーブロック5 を周方向に配列した重荷重用空気入タイ
ヤにおいて、前述の目的を達成するために次の技術的手
段を講じている。すなわち、本発明は、前記ショルダー
ブロック5 のそれぞれの周方向前後に周方向成分8Bを有
する第１・２側縁が形成され、この第１・２側縁のそれ
ぞれに軸方向成分8Aを有する第３・４側縁をそれぞれ接
続し、この第３・４側縁のそれぞれを、前記第１・２側
縁に対してタイヤ軸方向外方において周方向成分8Bを有
する第５側縁を介して接続することで外表面稜線が階段
状のタイヤ軸方向外側縁8を構成し、前記第１・２側縁
の周方向成分8Bがタイヤ軸方向に位相をずらしており、
前記周方向成分8Bを有する第５側縁と軸方向成分8Aを有
する第３・４側縁との接続部を、外表面視において面取
部9 に形成していることを特徴とするものである。Means for Solving the Problems The present invention, in the tread portion of the tire was arranged tio Le <br/> Zehnder block 5 surrounded by the circumferential grooves 1 and the axial grooves 2 circumferentially Direction burden The following technical measures have been taken in heavy pneumatic tires to achieve the above-mentioned object. That is, the present invention has a circumferential component 8B before and after each of the shoulder blocks 5 in the circumferential direction.
The first and second side edges are formed, and that of the first and second side edges is formed.
Connect the third and fourth side edges each having an axial component 8A to each
Then, each of the third and fourth side edges is connected to the first and second side.
Has a circumferential component 8B outside the tire axial direction with respect to the edge
The outer surface ridge line constitutes a stepwise outer edge 8 in the tire axial direction by connecting through the fifth side edge, and the first and second side edges are connected to each other.
The circumferential component 8B are out of phase in the tire axial direction,
Have the fifth side edge and axially Ingredient 8A with the circumferential Ingredient 8B
The connection portion with the third and fourth side edges is formed in the chamfered portion 9 when viewed from the outer surface.
【０００６】[0006]
【作用】雪氷路の轍はランダムに凹凸が存在するが、そ
の轍内を走行するとき、タイヤにおけるショルダーブロ
ック5 のタイヤ軸方向外側縁8 を、周方向成分8Bと軸方
向成分8Aを交互に接続することで外表面稜線が階段状に
構成され、ブロック５の 前後における第１・２側縁の周
方向成分8Bがタイヤ軸方向に位相をずらして形成し、前
記周方向成分8Bを有する第５側縁と軸方向成分8Aを有す
る第３・４側縁との接続部を、外表面視において面取部
9 に形成していることにより、轍の凹凸の影響を受けに
くくなり、ワンダリング性を向上する。[Action] rutting snow and ice road is randomly irregularities are present, when running in the rut, the axially outer edge 8 of the shoulder block 5 in the tire, the circumferential direction Ingredient 8B axially Ingredient 8A outer surface ridge stepwise by connecting alternately
Around the first and second side edges before and after the block 5
Direction component 8B is formed out of phase in the tire axial direction, having a fifth side edge and axially Ingredient 8A with the circumferential Ingredient 8B
The connecting portion with the third and fourth side edges is chamfered when viewed from the outer surface.
By being formed in 9, it is less susceptible to the irregularities of the rut and improves wandering.
【０００７】また、周方向成分8Bを有する第５側縁によ
って、コーナリング時の耐横すべり性能も向上する。[0007] I I <br/> fifth side edge having a circumferential Ingredient 8B, also improved耐横sliding performance during cornering.
【０００８】[0008]
【実施例】以下、図を参照して本発明の実施例を比較例
と対比しながら説明する。図１（Ａ）はタイヤのトレッ
ドパターンについてタイヤ中心Ｏ−Ｏから左半分を展開
して示しており、該パターンは中心Ｏ−Ｏに関して左右
対称である。この図１（Ａ）において、タイヤのトレッ
ド部には、周方向溝1 と軸方向溝2とで囲まれてセンタ
ーブロック3 、サイドブロック4 およびショルダーブロ
ック5 の多数が周方向及び軸方向に配列してある。Embodiments of the present invention will be described below with reference to the drawings in comparison with comparative examples. FIG. 1A shows the tread pattern of the tire, with the left half developed from the tire center OO, and the pattern is symmetrical about the center OO. In FIG. 1A, a large number of center blocks 3, side blocks 4 and shoulder blocks 5 are arranged in a circumferential direction and an axial direction in a tread portion of a tire, surrounded by a circumferential groove 1 and an axial groove 2. I have.
【０００９】前記センター、サイドおよびショルダーの
各ブロック3,4,5 の接地面には、それぞれサイプ3A,4A,
5Aを有しており、センターとサイドの各ブロック3,4 の
タイヤ軸方向内側の外表面稜線は、タイヤ軸方向成分6A
を有する側縁とタイヤ周方向成分6Bを有する側縁と交互
に接続することで階段状6 とされ、これによって、制動
性と耐横すべり性を向上している。ショルダーブロック
5 はタイヤ軸方向内側縁7 がタイヤ軸方向成分7Aを有す
る側縁とタイヤ周方向成分7Bを有する側縁とを接続する
ことで階段形状とされている。更に、タイヤ軸方向外側
縁8 については、前記ショルダーブロック5 のそれぞれ
の周方向前後に周方向成分8Bを有する第１・２側縁が形
成され、この第１・２側縁のそれぞれに軸方向成分8Aを
有する第３・４側縁をそれぞれ接続し、この第３・４側
縁のそれぞれを、前記第１・２側縁に対してタイヤ軸方
向外方において周方向成分8Bを有する第５側縁を介して
接続することで外表面稜線が階段状のタイヤ軸方向外側
縁8 を構成し、前記第１・２側縁の周方向成分8Bがタイ
ヤ軸方向に位相をずらしてあり、前記周方向成分8Bを有
する第５側縁と軸方向成分8Aを有する第３・４側縁との
接続部を、外表面視において面取部9 に形成している。
これにより、轍内において各ブロック5 の前後に形成さ
れた第１・２側縁の各タイヤ周方向成分8Bの部分は周方
向前後においてタイヤ軸方向で異なる部分にて接地し、
もって、ワンダリング性能を向上している。 The ground planes of the center, side and shoulder blocks 3 , 4 , 5 are provided with sipes 3A, 4A,
Has 5A, center and outer surface ridges of axially inner blocks 3 and 4 of the side, axially Ingredients 6A
Is stepped 6 by connecting alternately and side edges having a side edge and the tire circumferential direction Ingredient 6B having, thereby, it has improved braking performance and耐横slipperiness. Shoulder block
5 axially inner edge 7 having a tire axial direction Ingredient 7A
There is a stepped shape by connecting the side edges with that side edges and the tire circumferential direction Ingredient 7B. Further, with respect to the outer edge 8 in the tire axial direction, each of the shoulder blocks 5
The first and second side edges having a circumferential component 8B before and after the circumferential direction
And an axial component 8A on each of the first and second side edges.
The third and fourth side edges having the third and fourth sides are connected to each other.
Each of the edges is in the tire axial direction with respect to the first and second side edges.
By connecting via a fifth side edge having a circumferential component 8B outward and outward, the outer surface ridge line is stepwise outward in the tire axial direction.
Constitutes the rim 8, the circumferential direction component 8B of the first-2 side edges Yes out of phase in the tire axial direction, have a said circumferential Ingredient 8B
The connecting portion of the third-4 side edges having a fifth side edge and axially Ingredient 8A to, are formed on the chamfered portion 9 on the outer surface as viewed.
As a result, it is formed before and after each block 5 in the track.
The portion circumferential direction of the tire circumferential direction Ingredient 8B of the first and 2 side edges
Ground at different parts in the tire axial direction before and after
As a result, the wandering performance has been improved.
【００１０】更に、軸方向成分8Aを有する第３・４側縁
と周方向成分8Bを有する第５側縁との接続部は、図１
（Ｂ）で示す如く外表面視においてテーパー形状の面取
部9 とされていることにより、コーナリング時の応答性
を向上しているとともに、周方向成分8Bを有する第５側
縁によって耐横すべり性能を確保している。すなわち、
図７で示す比較例４の如く外側縁8'を細かい階段形状と
すればする程、ワンダリング性能は向上するも、ブロッ
ク5'のコーナー部分における周方向成分長さが少ないこ
とから、コーナリング時の横すべり性能が低下するし、
又、図６で示す比較例３の如く外側縁8'をブロック5'の
コーナー部分において面取部9'だけにすると、ワンダリ
ング性能が低下するし、又、図５（Ａ）で示す比較例１
の如く外側縁8'に面取部を形成しないとコーナリング時
の応答性が低下するし、又、図５（Ｂ）で示す比較例２
の如く長大な面取部9'に形成すると耐横すべり性能が低
下する。Furthermore, the connection portion between the fifth side edge having a third-4 edge <br/> the circumferential Ingredient 8B having an axial Ingredient 8A is 1
By being a chamfered portion 9 of the tapered shape in the outer surface when viewed as indicated by (B), with which to improve the responsiveness at the time of cornering, the fifth side having a circumferential Ingredient 8B
Edges ensure anti-skid performance. That is,
As the outer edge 8 'is made to have a finer step shape as in Comparative Example 4 shown in FIG. 7, the wandering performance is improved, but the circumferential component length at the corner portion of the block 5' is small. Side slip performance will decrease,
Also, if the outer edge 8 'is only the chamfered portion 9' at the corner of the block 5 'as in Comparative Example 3 shown in FIG. 6, the wandering performance is reduced, and the comparison shown in FIG. Example 1
If the chamfered portion is not formed on the outer edge 8 'as shown in FIG. 5, the responsiveness at the time of cornering is reduced, and the second comparative example shown in FIG.
When it is formed in the long chamfered portion 9 'as described above, the skid resistance is lowered.
【００１１】そこで、本発明においては、ブロック5 の
周方向前後に周方向成分8Bを有する第１・２側縁を形成
し、その前後の周方向成分8Bをタイヤ軸方向に位相をず
らすとともに軸方向成分8Aを有する第３・４側縁と周方
向成分8Bを有する第５側縁との接続部に、面取部9 を形
成することによって、ワンダリング性能、コーナリング
性能、耐横すべり性能を確保しているのである。更に、
外側縁8 は、図２（Ｂ）で示す如くタイヤ断面方向に面
取部を形成しなくともよいが、図２（Ａ）で示す如くタ
イヤ断面方向に面取部10を形成するものがワンダリング
性能等において有利となる。Therefore, in the present invention, the block 5
Forming a first-2 side edge having a circumferential Ingredient 8B in the longitudinal circumferential direction
And, the connecting portion between the fifth side edge having a third-4-side edge and circumferentially Ingredient 8B having an axial Ingredient 8A with shifting the phase of the circumferential component 8B before and after the tire axial direction, the plane By forming the recess 9, wandering performance, cornering performance, and skid resistance are ensured. Furthermore,
Outer edge 8 is not necessarily formed a chamfered portion in the tire cross-sectional direction, as shown in FIG. 2 (B), the data as shown in FIG. 2 (A)
Forming the chamfered portion 10 in the direction of the ear section is advantageous in wandering performance and the like.
【００１２】図３は本発明の第２実施例であり、面取部
9 をテーパー形状でなく、弧面に形成したものであり、
図４は本発明の第３実施例であり、面取部9 を、ブロッ
ク5の周方向前後のコーナー部にも形成したものであ
り、その他の構成は既述の内容と同一であり、共通部分
は共通符号で示している。次に、従来例Ａ、Ｂと本発明
実施例Ａ、Ｂについて、タイヤは10,000Ｒ20、空気内圧
7.25kg／cm2 、空車時速度30km／hr、路面は雪を押固め
た圧接路についてのテスト結果を示す。FIG. 3 shows a second embodiment of the present invention.
9 is not tapered but formed on an arc surface,
Figure 4 is a third embodiment of the present invention, a chamfered portion 9, block
It is also formed at the corners before and after in the circumferential direction of step 5 , and other configurations are the same as those described above, and common parts are denoted by common reference numerals. Next, for Conventional Examples A and B and Examples A and B of the present invention, the tire was 10,000 R20, and the air pressure was
7.25kg / cm 2 , idle speed 30km / hr, road surface shows the test results of a pressed road with compacted snow.
【００１３】なお、従来例Ａは、ショルダーブロックは
外表面視の面取部および断面方向の面取りがないもので
あり、従来例Ｂは、外表面視の面取部なく断面方向には
弧状の面取りを有するものである。一方、本発明実施例
Ａは外表面視の面取部9 を有するが断面方向の面取部は
有しないものであり、本発明実施例Ｂは双方の面取部9,
10を有するものである。また、評価は１〜５段階とし、
数値が大きい方が効果大である。The prior art A has a shoulder block without a chamfered portion and a chamfer in a cross-sectional direction when viewed from the outer surface. It has a chamfer. On the other hand, Example A of the present invention has a chamfered portion 9 as viewed from the outer surface but does not have a chamfered portion in the cross-sectional direction, and Example B of the present invention has both chamfered portions 9,
It has ten. In addition, the evaluation is 1 to 5 levels,
The higher the value, the greater the effect.
【００１４】[0014]
【表１】 [Table 1]
【００１５】[0015]
【発明の効果】本発明は以上の通りであり、ワンダリン
グ性能、コーナリング性能および耐横すべり性能をいず
れも確保することができて、雪氷路における重荷重用空
気入タイヤとして実益大である。As described above, the present invention can secure all of the wandering performance, the cornering performance, and the anti-skid performance, and is of great utility as a pneumatic tire for heavy loads on snow and ice roads.
【図１】本発明実施例のトレッドパターンとブロック形
状を示す平面図である。FIG. 1 is a plan view showing a tread pattern and a block shape according to an embodiment of the present invention.
【図２】ショルダーブロックの断面形状を示す図であ
る。FIG. 2 is a diagram showing a cross-sectional shape of a shoulder block.
【図３】本発明第２実施例のショルダーブロック平面図
である。FIG. 3 is a plan view of a shoulder block according to a second embodiment of the present invention.
【図４】本発明第３実施例のショルダーブロック平面図
である。FIG. 4 is a plan view of a shoulder block according to a third embodiment of the present invention.
【図５】比較例１、２を示す平面図である。FIG. 5 is a plan view showing Comparative Examples 1 and 2.
【図６】比較例３を示す平面図である。FIG. 6 is a plan view showing Comparative Example 3.
【図７】比較例４を示す平面図である。FIG. 7 is a plan view showing Comparative Example 4.
1 周方向溝 2 軸方向溝 3 センターブロック 4 サイドブロック 5 ショルダーブロック 8 外側縁 9 面取部 1 circumferential groove 2 axial groove 3 center block 4 side block 5 shoulder block 8 outer edge 9 chamfer
Claims (2)
び軸方向溝(2) で囲まれたショルダーブロック(5) を周
方向に配列した重荷重用空気入タイヤにおいて、 前記ショルダーブロック(5) のそれぞれの周方向前後に
周方向成分(8B)を有する第１・２側縁が形成され、この
第１・２側縁のそれぞれに軸方向成分(8A)を有する第３
・４側縁をそれぞれ接続し、この第３・４側縁のそれぞ
れを、前記第１・２側縁に対してタイヤ軸方向外方にお
いて周方向成分(8B)を有する第５側縁を介して接続する
ことで外表面稜線が階段状のタイヤ軸方向外側縁(8) を
構成し、前記第１・２側縁の周方向成分(8B)がタイヤ軸
方向に位相をずらしてあり、前記周方向成分(8B)を有す
る第５側縁と軸方向成分(8A)を有する第３・４側縁との
接続部を、外表面視において面取部(9) に形成している
ことを特徴とする重荷重用空気入タイヤ。The tread portion of claim 1. A tire, circumferential groove (1) and in the axial grooves (2) heavy duty pneumatic tire a tio Ruda block (5) arranged in the circumferential <br/> Direction surrounded by , Before and after each of the shoulder blocks (5) in the circumferential direction
First and second side edges having a circumferential component (8B) are formed.
A third with an axial component (8A) on each of the first and second side edges
.Connecting the four side edges respectively, and each of the third and fourth side edges
To the outer side in the tire axial direction with respect to the first and second side edges.
And the outer surface ridge line is connected with the fifth side edge having the circumferential component (8B) so that the outer surface ridge line has a step-like outer edge in the tire axial direction (8).
Configured, the circumferential direction component of the first-2 side edge (8B) is Yes out of phase in the tire axial direction, Yusuke the circumferential Ingredient a (8B)
Fifth side edge and axially Ingredient a connection between the third-4 side edges with (8A), heavy duty air, characterized by forming the chamfered portion (9) at the outer surface as viewed that Entering tire.
向に関して面取部(10)に形成していることを特徴とする
請求項１記載の重荷重用空気入タイヤ。2. The pneumatic tire for heavy load according to claim 1, wherein the outer surface ridge line according to claim 1 is formed in a chamfered portion (10) in a tire cross-sectional direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03213925A JP3090984B2 (en) | 1991-08-26 | 1991-08-26 | Pneumatic tires for heavy loads |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03213925A JP3090984B2 (en) | 1991-08-26 | 1991-08-26 | Pneumatic tires for heavy loads |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0550812A JPH0550812A (en) | 1993-03-02 |
| JP3090984B2 true JP3090984B2 (en) | 2000-09-25 |
Family
ID=16647320
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP03213925A Expired - Fee Related JP3090984B2 (en) | 1991-08-26 | 1991-08-26 | Pneumatic tires for heavy loads |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3090984B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4136558B2 (en) * | 2002-09-11 | 2008-08-20 | 株式会社ブリヂストン | Pneumatic tire |
| ITTO20060144A1 (en) * | 2006-02-28 | 2007-09-01 | Bridgestone Corp | TIRE |
| JP5081291B2 (en) * | 2010-11-11 | 2012-11-28 | 住友ゴム工業株式会社 | Heavy duty pneumatic tire |
-
1991
- 1991-08-26 JP JP03213925A patent/JP3090984B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0550812A (en) | 1993-03-02 |
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