JPH0322316Y2 - - Google Patents
Info
- Publication number
- JPH0322316Y2 JPH0322316Y2 JP1988085468U JP8546888U JPH0322316Y2 JP H0322316 Y2 JPH0322316 Y2 JP H0322316Y2 JP 1988085468 U JP1988085468 U JP 1988085468U JP 8546888 U JP8546888 U JP 8546888U JP H0322316 Y2 JPH0322316 Y2 JP H0322316Y2
- Authority
- JP
- Japan
- Prior art keywords
- elongation
- cord
- steel cord
- strands
- tire
- 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
Links
- 229910000831 Steel Inorganic materials 0.000 claims description 35
- 239000010959 steel Substances 0.000 claims description 35
- 239000002356 single layer Substances 0.000 claims description 6
- 230000007797 corrosion Effects 0.000 description 7
- 238000005260 corrosion Methods 0.000 description 7
- 230000035515 penetration Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 206010052904 Musculoskeletal stiffness Diseases 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 229910001369 Brass Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 230000008733 trauma Effects 0.000 description 1
Landscapes
- Ropes Or Cables (AREA)
Description
【考案の詳細な説明】
〔産業上の利用分野〕
本考案は自動車用タイヤ、コンベアベルト等の
ゴム補強材として用いられるスチールコードの改
良に関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement of a steel cord used as a rubber reinforcing material for automobile tires, conveyor belts, etc.
近年、自動車用タイヤでは、自動車の乗り心地
性を改善するためのタイヤの弾力性、タイヤの長
寿命化および燃費を改善するためのタイヤの軽量
化が特に求められている。
In recent years, in automobile tires, there has been a particular demand for tire elasticity to improve the riding comfort of automobiles, longer tire life, and lighter weight to improve fuel efficiency.
中でも長寿命化の要因としては、スチールコー
ドの耐カツト性と腐食があげられる。 Among these factors, the cut resistance and corrosion resistance of the steel cord are factors that contribute to longer life.
タイヤが小石、縁石等に乗り上げた時に生じる
スチールコードの切断を防ぐ耐カツト性の向上に
対しては、タイヤのベルト部に高い伸度を有する
スチールコード、いわゆるHigh Elong−ation
Cordを使用することが考えられ、現在ではトラ
ツク、バス用タイヤのベルト部へは３×７，４×
２，４×４等の撚り構成で、撚りピツチを小さく
した多重撚りのスチールコードがより高い伸度を
得るスチールコードとして用いられている。 In order to improve the cut resistance of the steel cord, which prevents the steel cord from being cut when the tire runs over a pebble, curbstone, etc., a steel cord with high elongation, so-called High Elong-ation, is used in the belt section of the tire.
Cord was considered to be used, and currently 3x7, 4x
Multi-twist steel cords with a twist configuration of 2, 4 x 4, etc. and a small twist pitch are used as steel cords that achieve higher elongation.
また、通常、乗用車用タイヤには１×４，１×
５等の単層撚りのスチールコードが用いられてい
る。 In addition, passenger car tires usually have 1×4, 1×
Grade 5 single-layer twisted steel cord is used.
上記多重撚りのスチールコードは撚りピツチが
小さく、しかも多重撚りであるため生産性が悪
く、製造コストが高くなるという問題点があり、
また単層撚りのスチールコードでは破断迄の伸度
が2.5〜3.8％と低く、High Elongat−ion Cord
としては伸びの効果が期待できないという問題点
がある。
The above-mentioned multi-stranded steel cord has a small twist pitch, and because it is multi-stranded, it has poor productivity and high manufacturing costs.
In addition, single-layer twisted steel cord has a low elongation of 2.5 to 3.8% before breaking.
However, there is a problem that no elongation effect can be expected.
また、一方では自動車が路面を走行中にタイヤ
が外傷を受けたとき、その傷から侵入した水分が
スチールコードの中央部の空〓に入り、この空〓
内をスチールコードの長手方向に伝播して腐食を
発生させ、スチールコードの疲労性の低下とゴム
の接着性の低下を伴い、タイヤのセパレーシヨン
現象を誘発するという問題点がある。 On the other hand, when a tire is damaged while a car is driving on the road, moisture that has entered through the damage enters the air in the center of the steel cord.
Corrosion propagates inside the steel cord in the longitudinal direction, causing corrosion, which is accompanied by a decrease in the fatigue resistance of the steel cord and a decrease in the adhesion of the rubber, leading to a problem of tire separation.
上記タイヤの外傷によるスチールコードの腐食
や、セパレーシヨン現象の防止のために最近では
オープンコードと呼ばれる素線間に〓間を設ける
よう緩く撚つたスチールコードが使用されている
が、コード外周径Ｄと撚りピツチＰとの比は一般
には12≦Ｐ／Ｄ≦20の範囲であるのでコードの伸
びは５％以下であり、１次伸び部分と２次伸び部
分の変曲点は零に近かつた。 In order to prevent corrosion of the steel cord due to tire trauma and the separation phenomenon, recently a steel cord called an open cord is used, which is loosely twisted so that there is a gap between the strands. Since the ratio of P and twist pitch P is generally in the range of 12≦P/D≦20, the elongation of the cord is less than 5%, and the inflection points of the primary elongation portion and the secondary elongation portion are close to zero. Ta.
このため、コードをより緩く撚つた状態のオー
プンコードとすることで破断迄の伸度を大きくす
ることが考えられるが、素線間の自由空間が大き
くなりすぎ、タイヤ成型時のゴム加硫時にスチー
ルコードの長手方向にしごきの形で外力が負荷さ
れた場合、素線がコード中心軸を軸芯にして回転
し、それに伴つて素線間の〓間が減少し、ゴムが
スチールコードの素線内部迄充分に侵入せず、ス
チールコードの腐食やセパレーシヨン現象を誘発
するという問題点を有し、実用には至つていな
い。 For this reason, it is possible to increase the elongation before breaking by twisting the cord more loosely into an open cord, but the free space between the strands becomes too large, and when the rubber is vulcanized during tire molding. When an external force is applied in the longitudinal direction of the steel cord in the form of squeezing, the strands rotate around the center axis of the cord, the distance between the strands decreases, and the rubber It has the problem that it does not penetrate sufficiently into the wire, causing corrosion and separation of the steel cord, and has not been put to practical use.
本考案は上記問題点を除去するためになされた
ものであり、３本乃至６本の素線を同一方向、同
一ピツチで撚り合わせた単層撚りのオープン撚り
スチールコードにおいて、コード外周径Ｄと撚り
ピツチＰの比が５≦Ｐ／Ｄ≦10で、かつ撚り合わ
せたコードの応力−伸び特性曲線における１次伸
び部分と２次伸び部分の変曲点が伸度0.5％〜３
％の範囲で、しかも１次伸び部分の引張り剛性
E1がE1＝700〜1800Kgｆ／mm2、２次伸び部分の引
張り剛性E2がE2＝7000〜12000Kgｆ／mm2の範囲と
し、複層撚りでしかもHigh Elongation Cordで
ある３×７，４×４等のスチールコードと、その
伸び、強力が略同等で、しかも安価に製造できる
スチールコードを提供するものである。
The present invention was made to eliminate the above problems, and in a single-layer open-stranded steel cord in which three to six strands are twisted in the same direction and with the same pitch, the cord outer diameter D and The twist pitch P ratio is 5≦P/D≦10, and the inflection point of the primary elongation part and the secondary elongation part in the stress-elongation characteristic curve of the twisted cord is an elongation of 0.5% to 3.
% range, and the tensile stiffness of the primary elongation part
E 1 is in the range of E 1 = 700 to 1800 Kgf/mm 2 , and the tensile rigidity E 2 of the secondary elongation part is in the range of E 2 = 7000 to 12,000 Kgf/mm 2 , and is a multi-layer twisted and High Elongation Cord 3×7, To provide a steel cord that has approximately the same elongation and strength as a 4×4 steel cord and can be manufactured at low cost.
〔実施例 １〕
線径が5.5mmφのピアノ線材を熱処理と伸線を
繰り返し、途中で真鍮メツキを施して素線径ｄが
0.38mmφのスチールコード用の素線１を形成す
る。[Example 1] Piano wire with a wire diameter of 5.5 mmφ was repeatedly heat-treated and wire-drawn, and brass plating was applied in the middle to reduce the wire diameter d.
A strand 1 for a steel cord of 0.38 mmφ is formed.
上記素線１の５本を同一方向で、撚りピツチＰ
が6.5の同一撚りピツチで撚り合わせ、第１図に
示すような撚りピツチＰとコード径Ｄの比がＰ／
Ｄ＝6.2で１×５×0.38の撚り構成を有するスチ
ールコード２を形成する。 Twist the five strands of the above wire 1 in the same direction, P
are twisted at the same twist pitch of 6.5, and the ratio of twist pitch P to cord diameter D is P/ as shown in Figure 1.
A steel cord 2 is formed with D=6.2 and a twist configuration of 1×5×0.38.
上記のように構成したスチールコード２の伸度
特性は、第２図に示すように総伸度が7.8％で、
１次伸度が1.6％を有している。このためゴムの
侵入率についてはスチールコードの長手方向の全
長においてほぼ100％を得ることができた。 As shown in Fig. 2, the elongation characteristics of the steel cord 2 constructed as described above have a total elongation of 7.8%.
The primary elongation is 1.6%. Therefore, we were able to obtain a rubber penetration rate of almost 100% over the entire length of the steel cord in the longitudinal direction.
なお、コード外周径Ｄと撚りピツチＰの比とコ
ードの伸びとの関係は第３図に示すとおりであ
り、Ｐ／Ｄが10以下であればコードの伸びは５％
以上となる。また、Ｐ／Ｄが５未満ではコードの
伸びは８％以上となるが、スチールコード製造時
における撚線のスピードが遅くなり、製造コスト
が大巾に高くなるとともにコード強力が極端に低
下するため、Ｐ／Ｄを５以上とするのが好まし
い。 The relationship between the ratio of the cord outer diameter D and the twist pitch P and the cord elongation is shown in Figure 3. If P/D is 10 or less, the cord elongation is 5%.
That's all. In addition, if P/D is less than 5, the elongation of the cord will be 8% or more, but the speed of stranding during steel cord manufacturing will be slow, the manufacturing cost will increase significantly, and the strength of the cord will be extremely reduced. , P/D is preferably 5 or more.
次に、第４図に示されるコードの応力−伸び特
性曲線において、１次伸び部分Ａは各素線同士が
密着せず、素線間に〓間を有する状態で、素線が
歪む部分であり、２次伸びＢは各素線同士が密着
し、素線間に〓間が全くなく、コード全体が歪む
部分である。従つて、変曲点Ｃは全素線が互いに
密着し合つた瞬間の応力−伸びの値である。 Next, in the stress-elongation characteristic curve of the cord shown in Fig. 4, the primary elongation part A is the part where the strands are distorted in a state where the strands do not come into close contact with each other and there are spaces between them. There is a secondary elongation B, where each strand is in close contact with each other, there is no space between the strands, and the entire cord is distorted. Therefore, the inflection point C is the stress-elongation value at the moment when all the wires come into close contact with each other.
上記変曲点迄の１次伸びにより、コード中央部
へのゴムの侵入状態が変化する。すなわち、第５
図に示される変曲点迄の伸び率とゴム侵入率との
関係から、撚り構成が１×３，１×４，１×５の
いずれをみても１次伸びが大きい程ゴムの侵入が
良いものである。 Due to the primary elongation up to the above-mentioned inflection point, the state in which the rubber enters the central portion of the cord changes. That is, the fifth
From the relationship between the elongation up to the inflection point and the rubber penetration rate shown in the figure, the larger the primary elongation, the better the rubber penetration, regardless of whether the twist configuration is 1 x 3, 1 x 4, or 1 x 5. It is something.
しかも、コードの素線の腐食を防止するため、
コード中心部の空間にゴムを侵入させるには、変
曲点の伸び率は最低0.5％が必要である。ここで、
変曲点の伸びの上限を３％としたが、これは３％
を超すと製造が非常に困難となり製造コストが大
巾に高くなり、しかもコード径が大きくなりす
ぎ、タイヤシーテイングの際にゴムシート層が厚
くなりすぎて問題となるものである。 Moreover, in order to prevent corrosion of the wires of the cord,
In order for the rubber to penetrate into the space at the center of the cord, the elongation rate at the inflection point must be at least 0.5%. here,
The upper limit of elongation at the inflection point was set at 3%;
If it exceeds this, it becomes very difficult to manufacture and the manufacturing cost increases considerably, and the cord diameter becomes too large, which causes problems when the rubber sheet layer becomes too thick during tire seating.
さらに、１次剛性をE1＝700〜1800Kgｆ／mm2と
したのはE1が700未満となると外力により変形し
やすく、コード中心部へのゴムの侵入が達成し難
くなり、1800を超えるとタイヤが小石や縁石等に
乗り上げたとき等において、タイヤの変形が吸収
できず、耐カツト性に対する本来のハイエロンゲ
ーシヨンコードとしての目的が達成できなくなる
ためである。 Furthermore, the primary stiffness was set to E 1 = 700 to 1800 Kgf/mm 2 because if E 1 is less than 700, it will be easily deformed by external force and it will be difficult to achieve rubber penetration into the center of the cord, and if it exceeds 1800, This is because when the tire runs on a pebble, curb, etc., the deformation of the tire cannot be absorbed, and the original purpose of the high elongation cord for cut resistance cannot be achieved.
また、２次剛性をE2＝7000〜12000Kgｆ／mm2と
したのは、E2が12000以下であるとハイエロンゲ
ーシヨンコードの目的である乗り心地性が良くな
り、耐カツト性が改善されるためである。 In addition, the secondary stiffness was set to E 2 = 7,000 to 12,000 Kgf/mm 2 because if E 2 is 12,000 or less, the purpose of the high elongation code is to improve ride comfort and improve cut resistance. This is for the purpose of
なお、ここでE2が7000未満になると、タイヤ
のベルト層の自動車走行中におけるコーナーリン
グフオースが悪くなり、タイヤの歪み量等（へこ
み）も大きくなる。しかもタイヤの偏摩耗が著し
く、ひいてはタイヤ寿命が短かくなるため、E2
は7000以上としたものである。 Note that when E 2 is less than 7000, the cornering force of the belt layer of the tire during driving of the vehicle deteriorates, and the amount of distortion, etc. (indentation) of the tire increases. Moreover, the uneven wear of the tires is significant and the lifespan of the tires is shortened, resulting in E 2
is 7000 or more.
本考案のスチールコードは上記構成であるた
め、単層撚りであるにもかかわらず多重撚りと同
様に５％以上の高伸度の伸びが得られるのでタイ
ヤの摩耗性能および耐カツト性能に優れている。
Since the steel cord of the present invention has the above structure, it can achieve a high elongation of 5% or more, similar to multi-stranded strands, even though it is a single-layer strand, so it has excellent tire abrasion performance and cut resistance. There is.
しかも、変曲点が最適な範囲で存在するため、
素線間の〓間が外力に対して減少せず、ゴムの侵
入率が良く、コード素線の耐腐食性を増し、タイ
ヤの寿命を伸ばすことができるとともに、単層撚
りであるため安価に製造できるものである。 Moreover, since the inflection point exists within the optimal range,
The gap between the strands does not decrease due to external force, the rubber penetration rate is good, the corrosion resistance of the cord strands is increased, the life of the tire can be extended, and since it is a single layer strand, it is inexpensive. It can be manufactured.
さらに、１次および２次引張り剛性値E1，E2
を規定したハイエロンゲーシヨンコードであるの
で自動車の乗り心地性も向上するという優れた実
用的効果を有するものである。 Furthermore, the primary and secondary tensile stiffness values E 1 , E 2
Since it is a high elongation code that specifies the following, it has an excellent practical effect of improving the ride comfort of automobiles.
第１図は本考案のスチールコードの一実施例を
示す切断端面図、第２図は第１図におけるスチー
ルコードの応力と伸度の関係を示す曲線図、第３
図は本考案のスチールコードにおけるコードの伸
度とＰ／Ｄとの関係を示す曲線図、第４図は本考
案のスチールコードにおける応力と伸びとの関係
を示す曲線図、第５図は本考案の異なる撚り構成
のスチールコードのゴム侵入率と変曲点迄の伸び
率との関係を示す曲線図である。
１……素線、２……スチールコード。
FIG. 1 is a cut end view showing an embodiment of the steel cord of the present invention, FIG. 2 is a curve diagram showing the relationship between stress and elongation of the steel cord in FIG. 1, and FIG.
The figure is a curve diagram showing the relationship between cord elongation and P/D in the steel cord of the present invention, Figure 4 is a curve diagram showing the relationship between stress and elongation in the steel cord of the present invention, and Figure 5 is a curve diagram showing the relationship between cord elongation and P/D in the steel cord of the present invention. It is a curve diagram showing the relationship between the rubber penetration rate and the elongation rate up to the inflection point of steel cords with different twist configurations. 1... Bare wire, 2... Steel cord.
Claims (1)
撚り合わせた単層撚りのオープン撚りスチールコ
ードにおいて、コード外周径Ｄと撚りピツチＰの
比が５≦Ｐ／Ｄ≦10で、かつ撚り合わせたコード
の応力−伸び特性曲線における１次伸び部分と２
次伸び部分の変曲点が伸度0.5％〜３％の範囲で、
しかも１次伸び部分の引張り剛性E1がE1＝700〜
1800Kgｆ／mm2、２次伸び部分の引張り剛性E2が
E2＝7000〜12000Kgｆ／mm2の範囲であることを特
徴とするスチールコード。 In a single-layer open-stranded steel cord in which three to six strands are twisted in the same direction and with the same pitch, the ratio of the cord outer diameter D to the twist pitch P is 5≦P/D≦10, and the twisted The first elongation part and the second elongation part in the stress-elongation characteristic curve of the combined cord
The inflection point of the next elongation part is in the elongation range of 0.5% to 3%,
Moreover, the tensile stiffness E 1 of the primary elongation part is E 1 = 700 ~
1800Kgf/mm 2 , the tensile stiffness E 2 of the secondary elongation part is
A steel cord characterized in that E 2 =7000 to 12000 Kgf/mm 2 .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988085468U JPH0322316Y2 (en) | 1988-06-28 | 1988-06-28 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988085468U JPH0322316Y2 (en) | 1988-06-28 | 1988-06-28 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0210494U JPH0210494U (en) | 1990-01-23 |
| JPH0322316Y2 true JPH0322316Y2 (en) | 1991-05-15 |
Family
ID=31310136
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988085468U Expired JPH0322316Y2 (en) | 1988-06-28 | 1988-06-28 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0322316Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3953364B2 (en) * | 2002-06-03 | 2007-08-08 | 横浜ゴム株式会社 | Pneumatic radial tire |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5590692A (en) * | 1978-10-31 | 1980-07-09 | Pirelli | Metal cord |
| JPS5643008A (en) * | 1979-09-13 | 1981-04-21 | Bridgestone Corp | Pneumatic radial tire |
-
1988
- 1988-06-28 JP JP1988085468U patent/JPH0322316Y2/ja not_active Expired
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5590692A (en) * | 1978-10-31 | 1980-07-09 | Pirelli | Metal cord |
| JPS5643008A (en) * | 1979-09-13 | 1981-04-21 | Bridgestone Corp | Pneumatic radial tire |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0210494U (en) | 1990-01-23 |
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