CN109927490A - The manufacturing method of green tire and pneumatic tire - Google Patents
The manufacturing method of green tire and pneumatic tire Download PDFInfo
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- CN109927490A CN109927490A CN201811396858.9A CN201811396858A CN109927490A CN 109927490 A CN109927490 A CN 109927490A CN 201811396858 A CN201811396858 A CN 201811396858A CN 109927490 A CN109927490 A CN 109927490A
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- 238000004519 manufacturing process Methods 0.000 title claims description 6
- 239000011324 bead Substances 0.000 claims description 191
- 238000000465 moulding Methods 0.000 claims description 30
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 241000293001 Oxytropis besseyi Species 0.000 claims 2
- 238000005253 cladding Methods 0.000 claims 1
- 238000004073 vulcanization Methods 0.000 description 28
- 230000000052 comparative effect Effects 0.000 description 7
- 238000000926 separation method Methods 0.000 description 6
- 238000011156 evaluation Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000000945 filler Substances 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
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Abstract
防止或者抑制由于充气轮胎上的包覆橡胶与钢丝的分离导致胎圈芯发生故障。生胎(1)的胎圈芯(6)具备：多根胎圈钢丝(8)，其在胎圈芯(6)的宽度方向的剖面中，在胎圈芯(6)的宽度方向及径向上隔开间隔配置；以及包覆橡胶(9)，其填充于胎圈钢丝(8)之间。胎圈芯(6)的径向的外侧面(6a)在胎圈芯(6)的宽度方向的剖面中朝径向外侧为凸状。胎圈芯(6)的径向的内侧面(6b)在胎圈芯(6)的宽度方向的剖面中朝径向内侧为凸状。
Prevents or suppresses the failure of the bead core due to the separation of the covering rubber and the steel wire on the pneumatic tire. The bead core (6) of the green tire (1) is provided with: a plurality of bead wires (8) which are arranged in the width direction and diameter of the bead core (6) in the cross section in the width direction of the bead core (6) spaced upwards; and a covering rubber (9) filled between the bead wires (8). The radially outer side surface (6a) of the bead core (6) is convex toward the radially outer side in a cross section in the width direction of the bead core (6). The radially inner side surface (6b) of the bead core (6) is convex toward the radially inner side in a cross-section in the width direction of the bead core (6).
Description
技术领域technical field
本发明涉及一种生胎及充气轮胎的制造方法。The present invention relates to a green tire and a method for manufacturing a pneumatic tire.
背景技术Background technique
专利文献1涉及一种充气轮胎的胎圈芯，公开了通过设定胎圈钢丝的直径等来抑制包覆橡胶与胎圈钢丝的分离。Patent Document 1 relates to a bead core for a pneumatic tire, and discloses that separation of the covering rubber and the bead wire is suppressed by setting the diameter of the bead wire and the like.
专利文献1：日本专利公开2008-062739号公报Patent Document 1: Japanese Patent Laid-Open No. 2008-062739
发明内容SUMMARY OF THE INVENTION
(一)要解决的技术问题(1) Technical problems to be solved
但是，包括专利文献1所公开的技术在内，以往的充气轮胎在防止由于包覆橡胶与胎圈钢丝的分离导致胎圈芯发生故障的方面具有改善的余地。However, including the technique disclosed in Patent Document 1, conventional pneumatic tires have room for improvement in preventing failure of the bead core due to separation of the cover rubber and the bead wire.
本发明的课题在于，防止或者抑制由于充气轮胎上的包覆橡胶与钢丝的分离导致胎圈芯发生故障。An object of the present invention is to prevent or suppress the failure of the bead core due to the separation of the covering rubber and the steel wire on the pneumatic tire.
(二)技术方案(2) Technical solutions
本发明的第一方式提供一种生胎，其具备分别位于一对胎侧部的内径端的环状的胎圈芯，所述胎圈芯具备：多根胎圈钢丝，其在所述胎圈芯的宽度方向的剖面中，在所述胎圈芯的宽度方向及所述胎圈芯的径向上隔开间隔配置；以及包覆橡胶，其填充于所述多根胎圈钢丝之间，所述胎圈芯的径向的外侧面在所述胎圈芯的宽度方向的剖面中朝径向外侧为凸状，所述胎圈芯的径向的内侧面在所述胎圈芯的宽度方向的剖面中朝径向内侧为凸状。A first aspect of the present invention provides a green tire including annular bead cores located at inner diameter ends of a pair of sidewall portions, respectively, the bead core including a plurality of bead wires that are located in the bead In a cross section in the width direction of the core, the bead cores are arranged at intervals in the width direction of the bead core and in the radial direction of the bead core; and a covering rubber is filled between the plurality of bead wires, so that the The radially outer side surface of the bead core is convex toward the radially outer side in the cross section in the width direction of the bead core, and the radially inner side surface of the bead core is in the width direction of the bead core. The cross section is convex toward the inner side in the radial direction.
一般来说，当制造对生胎进行硫化成型而成的充气轮胎时，具有从胎体帘布层向胎圈芯作用较大的张力的倾向。因此，假设在生胎的状态下胎圈芯的径向的外侧面和内侧面在胎圈芯的宽度方向的剖面中是平坦的形状，则当进行硫化成型时，由于从胎体帘布层向胎圈芯作用的张力，内侧面沿着胎体帘布层变形，外侧面由于从胎体帘布层作用的张力而在宽度方向上收缩而变形。通过在生胎的状态下使胎圈芯的外侧面和内侧面成为凸状，也就是说，通过使生胎的状态的胎圈芯成为与硫化成型后同样的形状，从而能够抑制由于在硫化成型时从胎体帘布层向胎圈芯作用的张力导致的外侧面和内侧面的变形，能够减少初始变形。其结果为，在对生胎进行硫化成型而获得的充气轮胎中，能够有效地防止或者抑制因在胎圈钢丝周边产生的变形引起包覆橡胶与胎圈钢丝分离而在胎圈芯发生故障。Generally, when a pneumatic tire obtained by vulcanization molding of a green tire is produced, a large tension tends to act from the carcass ply to the bead core. Therefore, assuming that the radially outer and inner surfaces of the bead core in the green tire are flat in cross-section in the width direction of the bead core, when vulcanization molding is performed, since the direction from the carcass ply to the The inner side is deformed along the carcass ply by the tension acting from the bead core, and the outer side is deformed by shrinking in the width direction due to the tension acting from the carcass ply. By making the outer and inner surfaces of the bead core convex in the state of the green tire, that is, by making the bead core in the state of the green tire the same shape as after vulcanization molding, it is possible to suppress the damage caused by the vulcanization during vulcanization. The deformation of the outer and inner sides caused by the tension acting from the carcass ply to the bead core during molding can reduce the initial deformation. As a result, in a pneumatic tire obtained by vulcanizing a green tire, it is possible to effectively prevent or suppress failure of the bead core due to separation of the covering rubber and the bead wire due to deformation around the bead wire.
优选所述外侧面的所述胎圈芯的宽度方向的剖面形状是曲率半径为5mm以上且15mm以下的圆弧状，所述内侧面的所述胎圈芯的宽度方向的剖面形状是曲率半径为5mm以上且15mm以下的圆弧状。Preferably, the cross-sectional shape of the bead core on the outer side in the width direction is an arc shape with a radius of curvature of 5 mm or more and 15 mm or less, and the cross-sectional shape of the bead core on the inner side in the width direction is a radius of curvature It is an arc shape of 5 mm or more and 15 mm or less.
优选所述外侧面的所述胎圈芯的宽度方向的剖面形状是曲率半径为所述胎圈芯的宽度方向的长度的50％以上且150％以下的圆弧状，所述内侧面的所述胎圈芯的宽度方向的剖面形状是曲率半径为所述胎圈芯的宽度方向的长度的50％以上且150％以下的圆弧状。Preferably, the cross-sectional shape in the width direction of the bead core on the outer side is an arc shape with a radius of curvature of 50% or more and 150% or less of the length in the width direction of the bead core, and all of the inner side surfaces are in the shape of an arc. The cross-sectional shape in the width direction of the bead core is an arc shape with a radius of curvature of 50% or more and 150% or less of the length of the bead core in the width direction.
本发明的第二方式提供一种充气轮胎的制造方法，通过将带状体多次缠绕成纵向层叠状来制造胎圈芯，其中，所述带状体用包覆橡胶包覆对齐成一排的多根胎圈芯而成，且宽度方向中央部的厚度比宽度方向两端部的厚度厚，所述胎圈芯的径向的外侧面在所述胎圈芯的宽度方向的剖面中朝径向外侧为凸状，所述胎圈芯的径向的内侧面在所述胎圈芯的宽度方向的剖面中朝径向外侧为凸状，对具备所述胎圈芯的生胎进行硫化成型。A second aspect of the present invention provides a method of manufacturing a pneumatic tire that manufactures a bead core by winding a belt-shaped body multiple times in a longitudinally stacked shape, wherein the belt-shaped body is covered with a covering rubber that is aligned in a row The bead core is formed by a plurality of bead cores, the thickness of the central part in the width direction is thicker than the thickness of the both ends in the width direction, and the radially outer surface of the bead core is oriented toward the diameter of the bead core in the cross section in the width direction of the bead core. The bead core has a convex shape toward the outside, the radially inner surface of the bead core is convex toward the radially outer side in a cross section in the width direction of the bead core, and the green tire provided with the bead core is vulcanized and molded. .
(三)有益效果(3) Beneficial effects
本发明的对生胎进行硫化成型而获得的充气轮胎能够防止或者抑制由于包覆橡胶与钢丝的分离导致胎圈芯发生故障。The pneumatic tire obtained by vulcanizing a green tire of the present invention can prevent or suppress the failure of the bead core due to the separation of the covering rubber and the steel wire.
附图说明Description of drawings
图1是本发明实施方式的生胎的子午线方向上的示意性局部剖视图。1 is a schematic partial cross-sectional view of a green tire according to an embodiment of the present invention in the meridian direction.
图2是胎圈芯的宽度方向上的示意性剖视图。FIG. 2 is a schematic cross-sectional view in the width direction of the bead core.
图3是用于制造本发明实施方式的胎圈芯的带状体的示意性剖视图。3 is a schematic cross-sectional view of a belt-shaped body used to manufacture a bead core according to an embodiment of the present invention.
图4是比较例的生胎的子午线方向上的示意性局部剖视图。4 is a schematic partial cross-sectional view of a green tire of a comparative example in the meridian direction.
附图标记说明Description of reference numerals
1-生胎；2-外胎；3-胎侧部；4-胎圈部；5-胎体帘布层；6-胎圈芯；6a-径向的外侧面；6b-径向的内侧面；6c-宽度方向的外侧面；6d-宽度方向的内侧面；7-胎边芯；8-胎圈钢丝；9-包覆橡胶；10-带状体；10a、10b-面。1-green tire; 2-outer tire; 3-sidewall part; 4-bead part; 5-carcass ply; 6-bead core; 6a-radial outer side; 6b-radial inner side; 6c-outer side in width direction; 6d-inner side in width direction; 7-bead filler; 8-bead wire; 9-covering rubber; 10-belt; 10a, 10b-plane.
具体实施方式Detailed ways
图1表示本发明的实施方式的生胎1。在图1中表示将胎圈芯6除外对生胎1进行硫化成型而获得充气轮胎后的形状。生胎1具备圆环状的外胎2。在外胎2的内周面设置有内衬层(未图示)。外胎2具备：一对胎侧部3，其与胎面部(未图示)的轮胎宽度方向外端部相连并向轮胎径向内侧延伸；以及一对胎圈部4，其位于各胎侧部3的内径端。在胎面部及胎侧部3的轮胎内面侧以架设于一对胎圈部4之间的方式配设有胎体帘布层5。本实施方式的生胎1是叉车用，胎体帘布层5所具有的帘线(例如，钢制帘线或者有机纤维帘线)相对于轮胎的径向倾斜地配置。也就是说，生胎1是斜交轮胎。FIG. 1 shows a green tire 1 according to an embodiment of the present invention. FIG. 1 shows the shape of the pneumatic tire obtained by vulcanization molding of the green tire 1 excluding the bead core 6 . The green tire 1 includes an annular casing 2 . An inner liner (not shown) is provided on the inner peripheral surface of the casing 2 . The outer tire 2 includes a pair of sidewall portions 3 that are connected to an outer end portion in the tire width direction of a tread portion (not shown) and extend inward in the tire radial direction, and a pair of bead portions 4 located in each sidewall portion 3 inside diameter ends. A carcass ply 5 is arranged on the tire inner surface side of the tread portion and the sidewall portion 3 so as to span between the pair of bead portions 4 . The green tire 1 of the present embodiment is for a forklift truck, and the cords (for example, steel cords or organic fiber cords) included in the carcass ply 5 are arranged obliquely with respect to the radial direction of the tire. That is, the green tire 1 is a bias tire.
各胎圈部4具备环状的胎圈芯6和配置于胎圈芯6的轮胎径向外侧的同样呈环状的胎边芯7。在图中，用附图标记W表示胎圈芯6的宽度方向，用附图标记R表示胎圈芯6的径向。Each bead portion 4 includes an annular bead core 6 and a similarly annular bead filler 7 disposed outside the bead core 6 in the tire radial direction. In the figure, the width direction of the bead core 6 is denoted by the reference numeral W, and the radial direction of the bead core 6 is denoted by the reference numeral R.
一并结合图2进行参照，胎圈芯6在本实施方式中具备钢制的胎圈钢丝8、和填充于胎圈钢丝8间的包覆橡胶(绝缘橡胶)9。更具体地说，在胎圈芯6的宽度方向的剖面(生胎1的子午线方向上的剖面)中，多根(在本实施方式中是7根)胎圈钢丝8在胎圈芯6的宽度方向(与轮胎宽度方向为相同方向)上隔开间隔配置，多根(在本实施方式中是8根)胎圈钢丝8在胎圈芯6的径向(与轮胎径向为相同方向)上隔开间隔配置。在本实施方式中，在胎圈芯6的宽度方向的剖面中，多根胎圈钢丝8在胎圈芯6的宽度方向及胎圈芯6的径向上分别均匀地配置。Referring also to FIG. 2 , in the present embodiment, the bead core 6 includes a bead wire 8 made of steel and a covering rubber (insulating rubber) 9 filled between the bead wires 8 . More specifically, in a cross-section in the width direction of the bead core 6 (a cross-section in the meridian direction of the green tire 1 ), a plurality of (seven in the present embodiment) bead wires 8 are located in the bead core 6 . The bead wires 8 are arranged at intervals in the width direction (the same direction as the tire width direction), and a plurality of (eight in this embodiment) bead wires 8 are arranged in the radial direction of the bead core 6 (the same direction as the tire radial direction). spaced interval configuration. In the present embodiment, in the cross section of the bead core 6 in the width direction, the plurality of bead wires 8 are uniformly arranged in the width direction of the bead core 6 and the radial direction of the bead core 6 .
在本实施方式中，胎圈芯6的宽度方向的剖面形状大致是四边形。更详细地说，胎圈芯6具备：外侧面6a，其是位于胎圈芯6的径向外侧的面；以及内侧面6b，其是位于胎圈芯6的径向内侧的面。另外，胎圈芯6具备胎圈芯6的宽度方向的外侧面6c与内侧面6d，其连结外侧面6a与内侧面6b。In the present embodiment, the cross-sectional shape in the width direction of the bead core 6 is substantially a quadrangle. More specifically, the bead core 6 includes an outer side surface 6 a which is a surface located radially outside of the bead core 6 , and an inner side surface 6 b which is a surface located radially inner side of the bead core 6 . Further, the bead core 6 includes an outer side surface 6c and an inner side surface 6d in the width direction of the bead core 6, and connects the outer side surface 6a and the inner side surface 6b.
胎圈芯6的径向的外侧面6a是曲面，在胎圈芯6的宽度方向的剖面上的形状是朝径向外侧突出的圆弧状。另外，胎圈芯6的径向的内侧面6b是曲面，在胎圈芯6的宽度方向的剖面上的形状是朝径向内侧突出的圆弧状。胎圈芯6的宽度方向的外侧面6c和内侧面6d都是平坦面，在胎圈芯6的宽度方向的剖面上的形状都是直线状。The radially outer side surface 6a of the bead core 6 is a curved surface, and the shape in the cross-section in the width direction of the bead core 6 is an arc shape protruding radially outward. In addition, the radially inner side surface 6b of the bead core 6 is a curved surface, and the shape in the cross-section in the width direction of the bead core 6 is an arc shape protruding radially inward. Both the outer side surface 6c and the inner side surface 6d in the width direction of the bead core 6 are flat surfaces, and the shapes in the cross section in the width direction of the bead core 6 are both linear.
胎圈芯6的径向的外侧面6a的宽度方向上的剖面形状的圆弧的曲率半径α1设定为5mm以上且15mm以下。另外，该曲率半径α1设定为胎圈芯6的宽度方向的长度L的50％以上且150％以下。The curvature radius α1 of the circular arc of the cross-sectional shape in the width direction of the radially outer surface 6 a of the bead core 6 is set to 5 mm or more and 15 mm or less. In addition, this curvature radius α1 is set to 50% or more and 150% or less of the length L in the width direction of the bead core 6 .
胎圈芯6的径向的内侧面6b的宽度方向上的剖面形状的圆弧的曲率半径α2设定为5mm以上且15mm以下。该曲率半径α2设定为胎圈芯6的宽度方向的长度L的50％以上且150％以下。The curvature radius α2 of the circular arc of the cross-sectional shape in the width direction of the radially inner surface 6 b of the bead core 6 is set to 5 mm or more and 15 mm or less. This curvature radius α2 is set to 50% or more and 150% or less of the length L in the width direction of the bead core 6 .
在本实施方式中，相对于胎圈芯6的宽度方向的剖面上的胎圈芯6的外形轮廓的面积即胎圈芯剖面积来说，包覆橡胶9的面积比例设定为65％以上且75％以下。In the present embodiment, the area ratio of the covering rubber 9 is set to 65% or more with respect to the area of the outer contour of the bead core 6 in the cross section of the bead core 6 in the width direction, that is, the cross-sectional area of the bead core and below 75%.
另外，在本实施方式中，胎圈芯6的宽度方向的剖面上的在胎圈芯6的宽度方向上相互邻接的两根胎圈钢丝8之间的最小间隔A设定为胎圈芯6的直径D的0.52倍以上且0.73倍以下。In addition, in the present embodiment, the minimum interval A between two bead wires 8 adjacent to each other in the width direction of the bead core 6 in the cross section in the width direction of the bead core 6 is set as the bead core 6 The diameter D of 0.52 times or more and 0.73 times or less.
而且，在本实施方式中，胎圈芯6的宽度方向的剖面上的在胎圈芯6的径向上相互邻接的两根胎圈钢丝8之间的最小间隔B设定为胎圈芯6的直径D的0.41倍以上且0.63倍以下。Furthermore, in the present embodiment, the minimum interval B between the two bead wires 8 adjacent to each other in the radial direction of the bead core 6 in the cross-section in the width direction of the bead core 6 is set to be the width of the bead core 6 . 0.41 times or more and 0.63 times or less the diameter D.
而且，在本实施方式中，胎圈芯6的宽度方向的剖面上的从与胎圈芯6的外形轮廓最邻接的胎圈钢丝8到外形轮廓的胎圈芯6的宽度方向的最短距离C、也就是说宽度方向端部的包覆橡胶的厚度设定为超过最小间隔A的1/2。Furthermore, in the present embodiment, the shortest distance C in the width direction of the bead core 6 from the bead wire 8 most adjacent to the outline of the bead core 6 to the width direction of the bead core 6 in the cross-section in the width direction of the bead core 6 That is, the thickness of the covering rubber at the ends in the width direction is set to exceed 1/2 of the minimum interval A.
参照图3，本实施方式中的胎圈芯6是通过将带状体10多次(在本实施方式中是8次)缠绕成纵向层叠状而制造，其中，带状体10用包覆橡胶9包覆了对齐成一排的多根(在本实施方式中是7根)胎圈钢丝8而成。该带状体10的面10a(与胎圈芯6的径向外侧的面6a对应)和面10b(与胎圈芯6的径向内侧的面6b对应)是具有30mm以上且120mm以下的曲率半径β1、β2的凸状的曲面。因此，该带状体10的宽度方向中央部的厚度T1比宽度方向两端部的厚度T2厚。通过使用具有这样的厚度分布的带状体10，从而获得径向的外侧面6a和内侧面6b是圆弧状的曲面的胎圈芯6。通过对具有该一对胎圈芯6的生胎1进行硫化成型而制造充气轮胎。Referring to FIG. 3 , the bead core 6 in the present embodiment is manufactured by winding a belt-like body 10 times (8 times in the present embodiment) into a longitudinally laminated shape, wherein the belt-like body 10 is covered with rubber 9 is formed by covering a plurality of (seven in this embodiment) bead wires 8 aligned in a row. The surfaces 10 a (corresponding to the radially outer surface 6 a of the bead core 6 ) and the surface 10 b (corresponding to the radially inner surface 6 b of the bead core 6 ) of the strip 10 have a curvature of 30 mm or more and 120 mm or less. A convex curved surface with radii β1 and β2. Therefore, the thickness T1 of the central portion in the width direction of the strip 10 is thicker than the thickness T2 of both end portions in the width direction. By using the belt-shaped body 10 having such a thickness distribution, the bead core 6 in which the radially outer side surface 6a and the inner side surface 6b are arc-shaped curved surfaces is obtained. A pneumatic tire is manufactured by vulcanization molding of the green tire 1 having the pair of bead cores 6 .
一般来说，当制造对生胎进行硫化成型而成的充气轮胎时，具有从胎体帘布层向胎圈芯作用较大的张力的倾向。该倾向在本实施方式这样的斜交轮胎的情况下尤其显著。因此，如图4所示，如果胎圈芯6的径向的外侧面6a和内侧面6b是平坦面、胎圈芯6的宽度方向的剖面上的形状是直线状，则当硫化成型时，由于从胎体帘布层5向胎圈芯6作用的张力，内侧面6b沿着胎体帘布层5变形，外侧面6a由于从胎体帘布层5作用的张力而在宽度方向上收缩而变形。由于该变形，硫化成型前是平坦面的外侧面6a和内侧面6b在硫化成型后都成为凸状的曲面。Generally, when a pneumatic tire obtained by vulcanization molding of a green tire is produced, a large tension tends to act from the carcass ply to the bead core. This tendency is particularly remarkable in the case of a bias tire like the present embodiment. Therefore, as shown in FIG. 4 , if the radially outer side surfaces 6 a and the inner side surfaces 6 b of the bead core 6 are flat surfaces, and the shape of the cross-section in the width direction of the bead core 6 is linear, when vulcanizing molding, The inner side 6b is deformed along the carcass ply 5 by the tension acting from the carcass ply 5 to the bead core 6, and the outer side 6a is deformed by shrinking in the width direction by the tension acting from the carcass ply 5. Due to this deformation, both the outer side surface 6a and the inner side surface 6b, which were flat surfaces before vulcanization molding, become convex curved surfaces after vulcanization molding.
在本实施方式中，通过在生胎1的状态下使胎圈芯6的外侧面6a和内侧面6b成为凸状的曲面、也就是说成为与硫化成型后同样的形状，从而能够抑制由于在硫化成型时从胎体帘布层5向胎圈芯6作用的张力导致的外侧面6a和内侧面6b的变形，能够减少初始变形。其结果为，在对生胎1进行硫化成型而获得的充气轮胎中，能够有效地防止或者抑制因在胎圈钢丝6周边产生的变形引起包覆橡胶9与胎圈钢丝8分离而在胎圈芯6发生故障。In the present embodiment, in the state of the green tire 1, by making the outer side surface 6a and the inner side surface 6b of the bead core 6 a convex curved surface, that is, the same shape as after vulcanization molding, it is possible to suppress the The deformation of the outer side surface 6a and the inner side surface 6b caused by the tension acting from the carcass ply 5 to the bead core 6 during vulcanization molding can reduce the initial deformation. As a result, in the pneumatic tire obtained by vulcanizing and molding the green tire 1, it is possible to effectively prevent or restrain the covering rubber 9 from being separated from the bead wire 8 due to the deformation around the bead wire 6 and causing the bead wire 8 to separate from the bead wire 8. Core 6 failed.
如前所述，当将胎圈芯6的径向的外侧面6a和内侧面6b的宽度方向上的剖面形状的圆弧的曲率半径α1、α2设定为5mm以上且15mm以下时，则如图4所示，与外侧面6a和内侧面6b在胎圈芯6的宽度方向的剖面中是平坦的形状的情况下进行硫化成型时所产生的变形后的曲率半径同等。因此，通过将曲率半径α1、α2设定在该范围，从而能够将硫化成型时的外侧面6a和内侧面6b的变形抑制为最小限。As described above, when the radii of curvature α1 and α2 of the circular arcs of the cross-sectional shape in the width direction of the radially outer side surface 6a and the inner side surface 6b of the bead core 6 are set to 5 mm or more and 15 mm or less, as follows: As shown in FIG. 4 , when the outer side surface 6 a and the inner side surface 6 b are flat in cross-section in the width direction of the bead core 6 , the radius of curvature after deformation is equivalent to that generated when vulcanization molding is performed. Therefore, by setting the curvature radii α1 and α2 within this range, the deformation of the outer side surface 6a and the inner side surface 6b during vulcanization molding can be minimized.
在将胎圈芯6的径向的外侧面6a和内侧面6b的宽度方向上的剖面形状的圆弧的曲率半径α1、α2设定为不足胎圈芯6的宽度方向的长度L的50％的情况下、也就是说在将外侧面6a和内侧面6b的曲率设定为过大的情况下，当制造胎圈芯6时，宽度方向中央部与宽度方向两端部的厚度的差过大，因此难以制造胎圈芯6。另一方面，在将胎圈芯6的径向的外侧面6a和内侧面6b的宽度方向上的剖面形状的圆弧的曲率半径α1、α2设定为比胎圈芯6的宽度方向的长度L的150％大的情况下、也就是说在将外侧面6a和内侧面6b的曲率设定为过小的情况下，几乎无法获得使外侧面6a和内侧面6b成为凸状的曲面所带来的抑制硫化成型时的胎圈芯6变形的效果。因而，优选胎圈芯6的径向的外侧面6a及内侧面6b的宽度方向上的剖面形状的圆弧的曲率半径α1、α2如前所述那样设定为胎圈芯6的宽度方向的长度L的50％以上且150％以下。The curvature radii α1 and α2 of the circular arcs of the cross-sectional shape in the width direction of the radially outer surface 6 a and the inner surface 6 b of the bead core 6 are set to be less than 50% of the length L in the width direction of the bead core 6 When the bead core 6 is manufactured, the difference in thickness between the width direction central portion and the width direction both ends is too large. Since it is large, it is difficult to manufacture the bead core 6 . On the other hand, the radii of curvature α1 and α2 of the circular arcs of the cross-sectional shape in the width direction of the radially outer surface 6 a and the inner surface 6 b of the bead core 6 are set to be larger than the length of the bead core 6 in the width direction. When 150% of L is large, that is, when the curvatures of the outer side surface 6a and the inner side surface 6b are set to be too small, it is almost impossible to obtain a convex surface with the outer side surface 6a and the inner side surface 6b. This has the effect of suppressing deformation of the bead core 6 during vulcanization molding. Therefore, it is preferable to set the radii of curvature α1 and α2 of the circular arcs of the cross-sectional shape in the width direction of the radially outer side surface 6 a and the inner side surface 6 b of the bead core 6 to the width direction of the bead core 6 as described above. 50% or more and 150% or less of the length L.
如前所述，通过将包覆橡胶9相对于胎圈芯剖面积的面积比例设定为65％以上且75％以下，从而能够在胎圈芯6的宽度方向及胎圈芯6的径向上相互邻接的两根胎圈钢丝8之间充分地确保填充包覆橡胶9的间隙。因此，能够防止因硫化成型时的包覆橡胶9的橡胶流动不良引起邻接的两根胎圈钢丝8相互接触，并确保胎圈钢丝8相对于包覆橡胶9的粘接性。因而，通过该面积设定也能够有效地防止或者抑制在对该生胎进行硫化成型而获得的充气轮胎中由于包覆橡胶9与胎圈钢丝8的分离导致胎圈芯发生故障。As described above, by setting the area ratio of the covering rubber 9 with respect to the cross-sectional area of the bead core to 65% or more and 75% or less, the width direction of the bead core 6 and the radial direction of the bead core 6 can be adjusted. The gap between the two bead wires 8 adjacent to each other is sufficiently filled with the covering rubber 9 . Therefore, the adjacent two bead wires 8 can be prevented from contacting each other due to poor rubber flow of the covering rubber 9 during vulcanization molding, and the adhesiveness of the bead wires 8 to the covering rubber 9 can be ensured. Therefore, this area setting can also effectively prevent or suppress the failure of the bead core due to the separation of the covering rubber 9 and the bead wire 8 in the pneumatic tire obtained by vulcanization molding the green tire.
要确保硫化成型时的良好的橡胶流动，优选最小间隔A较宽。但是，如果最小间隔A过宽，则会在通过硫化成型而获得的充气轮胎中，使得作为胎圈芯6整体的刚性变低，容易因行驶而发生变形，会降低相对于其它模式的故障的耐久性。如前所述，通过将最小间隔A设定为胎圈芯6的直径D的0.52倍以上且0.73倍以下，能够兼顾硫化成型时的良好的橡胶流动、和通过硫化成型而获得的充气轮胎中的胎圈芯的刚性确保。To ensure good rubber flow during vulcanization molding, it is preferable that the minimum interval A is wide. However, if the minimum interval A is too wide, in the pneumatic tire obtained by vulcanization molding, the rigidity of the bead core 6 as a whole becomes low, and the bead core 6 is easily deformed by running, which reduces the probability of failure compared with other modes. Durability. As described above, by setting the minimum interval A to be 0.52 times or more and 0.73 times or less the diameter D of the bead core 6, it is possible to achieve both good rubber flow during vulcanization molding and a pneumatic tire obtained by vulcanization molding. The rigidity of the bead core is ensured.
要确保硫化成型时的良好的橡胶流动，优选最小间隔B较宽。但是，如果最小间隔B过宽，则会在通过硫化成型而获得的充气轮胎中，使得作为胎圈芯6整体的刚性变低。另外，如果最小间隔B过宽，则会导致在将通过硫化成型而获得的充气轮胎安装于轮辋时，位于胎圈芯6的径向外侧的胎圈钢丝8配置于较大地远离轮辋的位置。该配置也会降低相对于其它模式的故障的耐久性。如前所述，通过将最小间隔B设定为胎圈芯D的直径的0.41倍以上且0.63倍以下，能够兼顾硫化成型时的良好的橡胶流动、和通过硫化成型而获得的充气轮胎中的胎圈芯的刚性确保。To ensure good rubber flow during vulcanization molding, it is preferable that the minimum interval B is wide. However, if the minimum interval B is too wide, the rigidity of the entire bead core 6 is lowered in the pneumatic tire obtained by vulcanization molding. In addition, if the minimum interval B is too wide, the bead wire 8 located radially outside the bead core 6 is disposed at a position farther away from the rim when the pneumatic tire obtained by vulcanization molding is mounted on the rim. This configuration also reduces durability relative to other modes of failure. As described above, by setting the minimum interval B to be 0.41 times or more and 0.63 times or less the diameter of the bead core D, it is possible to achieve both good rubber flow during vulcanization molding and good rubber flow in the pneumatic tire obtained by vulcanization molding. The rigidity of the bead core is ensured.
通过将从与胎圈芯6的外形轮廓最邻接的胎圈钢丝8到外形轮廓的最短距离C设定为超过最小间隔A的1/2来充分地确保最短距离C，从而能够防止硫化成型时的橡胶流动引起的与胎圈芯6的外形轮廓最邻接的胎圈钢丝8与胎体帘布层5的接触，并确保胎圈芯6与胎体帘布层5的粘接性。By setting the shortest distance C from the bead wire 8 most adjacent to the outer contour of the bead core 6 to the outer contour to exceed 1/2 of the minimum interval A, the shortest distance C can be sufficiently ensured, so that it is possible to prevent the time of vulcanization molding. The contact between the bead wire 8 most adjacent to the outer contour of the bead core 6 and the carcass ply 5 is caused by the flow of the rubber, and the adhesion between the bead core 6 and the carcass ply 5 is ensured.
(评价试验)(Evaluation test)
关于对比较例1及实施例1的生胎1进行硫化成型而制造的充气轮胎，进行了胎圈芯的耐久性的评价试验。About the pneumatic tire manufactured by vulcanization molding of the green tire 1 of the comparative example 1 and the example 1, the evaluation test of the durability of the bead core was performed.
比较例1的生胎1是图4所图示的生胎，实施例1的生胎1是图1所图示的生胎，也就是本发明的实施方式。在比较例1的生胎1中，胎圈芯6的外侧面6a和内侧面6b是平坦面。在实施例1的生胎1中，胎圈芯6的外侧面6a和内侧面6b是凸状的曲面，胎圈芯6的宽度方向的剖面形状是曲率半径α1、α2为5mm以上且15mm以下的圆弧状。另外，在实施例1的生胎1所具备的胎圈芯6中，曲率半径α1、α2为胎圈芯6的宽度方向的长度L的50％以上且150％以下。关于胎圈芯1的规格在比较例1及实施例1中是共同的。尤其是，关于比较例1及实施例1的任意一方，胎圈钢丝8在胎圈芯6的宽度方向上是7根、在胎圈芯6的径向上是8根。The green tire 1 of Comparative Example 1 is the green tire shown in FIG. 4 , and the green tire 1 of Example 1 is the green tire shown in FIG. 1 , that is, an embodiment of the present invention. In the green tire 1 of Comparative Example 1, the outer side surface 6a and the inner side surface 6b of the bead core 6 are flat surfaces. In the green tire 1 of Example 1, the outer side surface 6a and the inner side surface 6b of the bead core 6 are convexly curved surfaces, and the cross-sectional shape of the bead core 6 in the width direction is such that the curvature radii α1 and α2 are 5 mm or more and 15 mm or less. arc shape. In addition, in the bead core 6 included in the green tire 1 of Example 1, the curvature radii α1 and α2 are 50% or more and 150% or less of the length L in the width direction of the bead core 6 . The specifications of the bead core 1 are common to Comparative Example 1 and Example 1. In particular, with regard to either of Comparative Example 1 and Example 1, the number of bead wires 8 is seven in the width direction of the bead core 6 and eight in the radial direction of the bead core 6 .
作为评价方法，是将充气轮胎安装于2t叉车，并使用到完全磨损为止。充气轮胎的大小是7.00－12，轮辋大小是12×7.00，气压是1000kPa。确认了使用到完全磨损后的胎圈芯有无故障。As an evaluation method, a pneumatic tire was attached to a 2t forklift and used until it was completely worn out. The size of the pneumatic tire is 7.00-12, the size of the rim is 12×7.00, and the air pressure is 1000kPa. Check whether the bead core has been used until it is completely worn out.
在由比较例1的生胎1制造的充气轮胎中，在使用途中发生了胎圈芯6的故障。与此相对，在由实施例1的生胎1制造的充气轮胎中，使用后也没有在胎圈芯6发现损伤。In the pneumatic tire produced from the green tire 1 of Comparative Example 1, a failure of the bead core 6 occurred during use. In contrast, in the pneumatic tire produced from the green tire 1 of Example 1, no damage was found to the bead core 6 after use.
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| CN104245364A (en) * | 2012-02-27 | 2014-12-24 | 住友橡胶工业株式会社 | Pneumatic tire |
| JP2014000879A (en) * | 2012-06-18 | 2014-01-09 | Yokohama Rubber Co Ltd:The | Pneumatic tire and method for manufacturing pneumatic tire |
| CN103625222A (en) * | 2012-08-27 | 2014-03-12 | 固特异轮胎和橡胶公司 | Bead structure for a pneumatic tire |
| CN110435360A (en) * | 2013-03-06 | 2019-11-12 | 倍耐力轮胎股份公司 | Tire for wheel of vehicle |
| CN104691249A (en) * | 2015-03-06 | 2015-06-10 | 江苏通用科技股份有限公司 | Transitional filling type molding rubber |
| CN106427409A (en) * | 2015-08-12 | 2017-02-22 | 住友橡胶工业株式会社 | Pneumatic tire |
| CN106553491A (en) * | 2015-09-28 | 2017-04-05 | 东洋橡胶工业株式会社 | Pneumatic tire |
| CN106585289A (en) * | 2015-10-14 | 2017-04-26 | 住友橡胶工业株式会社 | Pneumatic tire |
| CN106827606A (en) * | 2015-12-07 | 2017-06-13 | 东洋橡胶工业株式会社 | Bead member manufacture method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109927490B (en) | 2021-04-27 |
| JP2019098991A (en) | 2019-06-24 |
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