CN109927490B - Green tire and method for manufacturing pneumatic tire - Google Patents
Green tire and method for manufacturing pneumatic tire Download PDFInfo
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- CN109927490B CN109927490B CN201811396858.9A CN201811396858A CN109927490B CN 109927490 B CN109927490 B CN 109927490B CN 201811396858 A CN201811396858 A CN 201811396858A CN 109927490 B CN109927490 B CN 109927490B
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Abstract
The occurrence of failure of the bead core due to separation of the covering rubber from the steel wire on the pneumatic tire is prevented or suppressed. A bead core (6) of a green tire (1) is provided with: a plurality of bead wires (8) that are arranged at intervals in the width direction and the radial direction of the bead core (6) in the cross section of the bead core (6) in the width direction; and a coating rubber (9) filled between the bead wires (8). The outer surface (6a) of the bead core (6) in the radial direction is convex in the radial direction in a cross section of the bead core (6) in the width direction. The inner side surface (6b) of the bead core (6) in the radial direction is convex toward the inner side in the radial direction in the cross section of the bead core (6) in the width direction.
Description
Technical Field
The present invention relates to a method for manufacturing a green tire and a pneumatic tire.
Background
Patent document 1: japanese patent laid-open No. 2008-062739
Disclosure of Invention
Technical problem to be solved
However, the conventional pneumatic tire has room for improvement in preventing the bead core from breaking down due to the separation of the covering rubber from the bead wire, including the technique disclosed in patent document 1.
The invention aims to prevent or inhibit the failure of a bead core caused by the separation of a covering rubber and a steel wire on a pneumatic tire.
(II) technical scheme
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 cores including: a plurality of bead wires arranged at intervals in the width direction of the bead core and in the radial direction of the bead core in a cross section in the width direction of the bead core; and a covering rubber filled between the plurality of bead wires, wherein the outer side surface of the bead core in the radial direction is convex toward the outer side in the radial direction in the cross section of the bead core in the width direction, and the inner side surface of the bead core in the radial direction is convex toward the inner side in the radial direction in the cross section of the bead core in the width direction.
In general, when a pneumatic tire obtained by vulcanizing and molding a green tire is manufactured, a large tension tends to act from a carcass ply to a bead core. Therefore, assuming that the outer side surface and the inner side surface of the bead core in the radial direction are flat in the cross section of the bead core in the width direction in the state of a green tire, when vulcanization molding is performed, the inner side surface deforms along the carcass ply due to tension acting from the carcass ply to the bead core, and the outer side surface contracts in the width direction due to tension acting from the carcass ply and deforms. By making the outer side surface and the inner side surface 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 into the same shape as after vulcanization molding, it is possible to suppress deformation of the outer side surface and the inner side surface due to a tension acting from the carcass ply to the bead core at the time of vulcanization molding, and it is possible to reduce initial deformation. As a result, in the pneumatic tire obtained by vulcanizing and molding the green tire, it is possible to effectively prevent or suppress the occurrence of failure in the bead core due to separation of the covering rubber from the bead wire caused by deformation occurring in the periphery of the bead wire.
Preferably, the cross-sectional shape of the outer side surface in the width direction of the bead core is an arc shape having a radius of curvature of 5mm or more and 15mm or less, and the cross-sectional shape of the inner side surface in the width direction of the bead core is an arc shape having a radius of curvature of 5mm or more and 15mm or less.
Preferably, the cross-sectional shape of the outer side surface in the width direction of the bead core is an arc having a radius of curvature of 50% or more and 150% or less of the length of the bead core in the width direction, and the cross-sectional shape of the inner side surface in the width direction of the bead core is an arc having a radius of curvature of 50% or more and 150% or less of the length of the bead core in the width direction.
A second aspect of the present invention provides a method of manufacturing a pneumatic tire, in which a band-shaped body is wound a plurality of times in a longitudinally laminated state to manufacture a bead core, wherein the band-shaped body is formed by covering a plurality of bead cores aligned in a row with a covering rubber, and a thickness of a central portion in a width direction is larger than thicknesses of both end portions in the width direction, an outer side surface in a radial direction of the bead core is convex toward a radially outer side in a cross section in the width direction of the bead core, and an inner side surface in the radial direction of the bead core is convex toward the radially outer side in the cross section in the width direction of the bead core, and a green tire provided with the bead core is vulcanized.
(III) advantageous effects
The pneumatic tire obtained by vulcanization molding of the green tire of the present invention can prevent or suppress the occurrence of failure of the bead core due to separation of the covering rubber from the steel wire.
Drawings
Fig. 1 is a schematic partial cross-sectional view in the meridian direction of a green tire of an embodiment of the present invention.
Fig. 2 is a schematic cross-sectional view in the width direction of the bead core.
Figure 3 is a schematic cross-sectional view of a strip for use in manufacturing a bead core in an embodiment of the present invention.
Fig. 4 is a schematic partial cross-sectional view in the meridian direction of a green tire of a comparative example.
Description of the reference numerals
1-a green tyre; 2-cover tyre; 3-sidewall portions; 4-bead portion; 5-a carcass ply; 6-bead core; 6 a-a radial outer side; 6 b-a radially inner side; 6 c-the outer lateral surface in the width direction; 6 d-inner side surface in width direction; 7-bead filler; 8-bead wire; 9-coating rubber; 10-a ribbon; 10a, 10 b-plane.
Detailed Description
Fig. 1 shows a green tire 1 according to an embodiment of the present invention. Fig. 1 shows a shape of a pneumatic tire obtained by vulcanization molding of the green tire 1 except for the bead cores 6. The green tire 1 includes an annular tire casing 2. An inner liner (not shown) is provided on the inner circumferential surface of the tire case 2. The tire casing 2 includes: a pair of sidewall portions 3 that extend toward the inside in the tire radial direction and are connected to the tire width direction outer end portions of a tread portion (not shown); and a pair of bead portions 4 located at inner diameter ends of the respective sidewall portions 3. A carcass ply 5 is disposed on the tire inner surface side of the tread portion and the sidewall portion 3 so as to be laid between the pair of bead portions 4. The green tire 1 of the present embodiment is for a forklift, 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.
Each bead portion 4 includes an annular bead core 6 and a similarly annular bead filler 7 disposed on the outer side of the bead core 6 in the tire radial direction. In the figure, the width direction of the bead core 6 is denoted by reference numeral W, and the radial direction of the bead core 6 is denoted by reference numeral R.
Referring to fig. 2 as well, the bead core 6 in the present embodiment includes bead wires 8 made of steel, and a covering rubber (insulating rubber) 9 filled between the bead wires 8. More specifically, in a cross section of the bead core 6 in the width direction (a cross section of the green tire 1 in the meridian direction), a plurality of (7 in the present embodiment) bead wires 8 are arranged at intervals in the width direction of the bead core 6 (in the same direction as the tire width direction), and a plurality of (8 in the present embodiment) bead wires 8 are arranged at intervals in the radial direction of the bead core 6 (in the same direction as the tire radial direction). In the present embodiment, 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, respectively, in the cross section of the bead core 6 in the width direction.
In the present embodiment, the cross-sectional shape of the bead core 6 in the width direction is substantially a quadrangle. More specifically, the bead core 6 includes: an outer side surface 6a which is a surface located radially outward of the bead core 6; and an inner side surface 6b, which is a surface located radially inward of the bead core 6. The bead core 6 includes an outer surface 6c and an inner surface 6d in the width direction of the bead core 6, and connects the outer surface 6a and the inner surface 6 b.
The outer surface 6a of the bead core 6 in the radial direction is a curved surface, and the shape of the cross section of the bead core 6 in the width direction is an arc shape protruding outward in the radial direction. The inner surface 6b of the bead core 6 in the radial direction is a curved surface, and the shape of the cross section of the bead core 6 in the width direction is an arc shape protruding inward in the radial direction. The outer side surface 6c and the inner side surface 6d of the bead core 6 in the width direction are flat surfaces, and the shape of the cross section of the bead core 6 in the width direction is linear.
The curvature radius α 1 of the arc of the cross-sectional shape of the radially outer surface 6a of the bead core 6 in the width direction is set to 5mm to 15 mm. The curvature radius α 1 is set to 50% or more and 150% or less of the length L of the bead core 6 in the width direction.
The curvature radius α 2 of the arc of the cross-sectional shape of the inner surface 6b in the radial direction of the bead core 6 is set to 5mm to 15 mm. The curvature radius α 2 is set to 50% to 150% of the length L of the bead core 6 in the width direction.
In the present embodiment, the area ratio of the covering rubber 9 is set to 65% to 75% with respect to the cross-sectional area of the bead core, which is the area of the outer contour of the bead core 6 in the cross-section of the bead core 6 in the width direction.
In the present embodiment, the minimum distance a between two bead wires 8 adjacent to each other in the width direction of the bead core 6 in the cross section of the bead core 6 in the width direction is set to 0.52 times or more and 0.73 times or less the diameter D of the bead core 6.
In the present embodiment, the minimum distance B between two bead wires 8 adjacent to each other in the radial direction of the bead core 6 in the cross section of the bead core 6 in the width direction is set to 0.41 times or more and 0.63 times or less the diameter D of the bead core 6.
In the present embodiment, the shortest distance C in the width direction from the bead wire 8 most adjacent to the outline of the bead core 6 to the bead core 6 in the outline, that is, the thickness of the coating rubber at the end in the width direction on the cross section of the bead core 6 in the width direction is set to 1/2 exceeding the minimum distance a.
Referring to fig. 3, the bead core 6 in the present embodiment is manufactured by winding a strip 10, which is formed by covering a plurality of (7 in the present embodiment) bead wires 8 aligned in a row with a covering rubber 9, into a longitudinally laminated shape a plurality of times (8 times in the present embodiment). The surface 10a (corresponding to the radially outer surface 6a of the bead core 6) and the surface 10b (corresponding to the radially inner surface 6b of the bead core 6) of the strip 10 are convex curved surfaces having radii of curvature β 1, β 2 of 30mm to 120 mm. Therefore, the thickness T1 at the center in the width direction of the strip 10 is thicker than the thickness T2 at both ends in the width direction. By using the strip 10 having such a thickness distribution, the bead core 6 having the radially outer side surface 6a and the radially inner side surface 6b which are curved surfaces of circular arc shapes is obtained. The pneumatic tire is manufactured by vulcanizing and molding the green tire 1 having the pair of bead cores 6.
In general, when a pneumatic tire obtained by vulcanizing and molding a green tire is manufactured, a large tension tends to act from a carcass ply to a bead core. This tendency is particularly remarkable in the case of a bias tire as in the present embodiment. Therefore, as shown in fig. 4, if the outer side surface 6a and the inner side surface 6b in the radial direction of the bead core 6 are flat surfaces and the shape of the bead core 6 in the cross section in the width direction is linear, the inner side surface 6b deforms along the carcass ply 5 due to the tension acting from the carcass ply 5 to the bead core 6 when vulcanization molding, and the outer side surface 6a deforms by contracting in the width direction due to the tension acting from the carcass ply 5. Due to this deformation, both the outer surface 6a and the inner surface 6b, which are flat surfaces before vulcanization molding, have convex curved surfaces after vulcanization molding.
In the present embodiment, by forming the outer surface 6a and the inner surface 6b of the bead core 6 into convex curved surfaces in the state of the green tire 1, that is, into the same shape as that after vulcanization molding, deformation of the outer surface 6a and the inner surface 6b due to tension acting from the carcass ply 5 to the bead core 6 at the time of vulcanization molding can be suppressed, and initial deformation can be reduced. As a result, in the pneumatic tire obtained by vulcanizing and molding the green tire 1, it is possible to effectively prevent or suppress the occurrence of failure in the bead core 6 due to separation of the covering rubber 9 from the bead wire 8 caused by deformation occurring in the periphery of the bead wire 6.
As described above, when the radii of curvature α 1 and α 2 of the arcs of the cross-sectional shapes in the width direction of the outer surface 6a and the inner surface 6b in the radial direction of the bead core 6 are set to be 5mm or more and 15mm or less, as shown in fig. 4, the radii of curvature after deformation generated when vulcanization molding is performed are equivalent to the radii of curvature after deformation generated when the outer surface 6a and the inner surface 6b are flat in the cross-sectional shape in the width direction of the bead core 6. Therefore, by setting the radii of curvature α 1, α 2 in these ranges, the deformation of the outer surface 6a and the inner surface 6b during vulcanization molding can be suppressed to the minimum.
When the radii of curvature α 1, α 2 of the arcs of the cross-sectional shapes in the width direction of the outer surface 6a and the inner surface 6b in the radial direction of the bead core 6 are set to less than 50% of the length L in the width direction of the bead core 6, that is, when the curvatures of the outer surface 6a and the inner surface 6b are set to be excessively large, the difference in thickness between the center portion in the width direction and both end portions in the width direction is excessively large when the bead core 6 is manufactured, and therefore, it is difficult to manufacture the bead core 6. On the other hand, when the radii of curvature α 1, α 2 of the arcs of the cross-sectional shapes of the outer surface 6a and the inner surface 6b in the radial direction of the bead core 6 are set to be larger than 150% of the length L in the width direction of the bead core 6, that is, when the curvatures of the outer surface 6a and the inner surface 6b are set to be excessively small, the effect of suppressing deformation of the bead core 6 during vulcanization molding due to the outer surface 6a and the inner surface 6b being curved surfaces in a convex shape is hardly obtained. Therefore, the radii of curvature α 1, α 2 of the arcs of the cross-sectional shapes in the width direction of the outer surface 6a and the inner surface 6b in the radial direction of the bead core 6 are preferably set to 50% or more and 150% or less of the length L in the width direction of the bead core 6 as described above.
As described above, by setting the area ratio of the covering rubber 9 to the cross-sectional area of the bead core to 65% or more and 75% or less, it is possible to sufficiently secure a gap for filling the covering rubber 9 between the two bead wires 8 adjacent to each other in the width direction of the bead core 6 and the radial direction of the bead core 6. Therefore, it is possible to prevent the two adjacent bead wires 8 from contacting each other due to a rubber flow failure of the covering rubber 9 at the time of vulcanization molding, and to ensure adhesiveness of the bead wires 8 to the covering rubber 9. Therefore, the occurrence of failure of the bead core due to separation of the covering rubber 9 from the bead wire 8 in the pneumatic tire obtained by vulcanization molding of the green tire can be effectively prevented or suppressed by the area setting.
To ensure good rubber flow during vulcanization molding, the minimum distance a is preferably wide. However, if the minimum interval a is too wide, the rigidity of the entire bead core 6 becomes low in the pneumatic tire obtained by vulcanization molding, and the tire is likely to be deformed by running, and the durability against failure in other modes is reduced. As described above, by setting the minimum distance a to 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 of good rubber flow at the time of vulcanization molding and securing of rigidity of the bead core in the pneumatic tire obtained by vulcanization molding.
To ensure good rubber flow at the time of vulcanization molding, it is preferable that the minimum interval B is wide. However, if the minimum interval B is too wide, rigidity as the whole of the bead core 6 becomes low in the pneumatic tire obtained by vulcanization molding. In addition, if the minimum interval B is too wide, it may result in that the bead wires 8 located radially outside the bead cores 6 are arranged at positions greatly distant from the rim when the pneumatic tire obtained by vulcanization molding is mounted on the rim. This configuration may also reduce durability against other modes of failure. As described above, by setting the minimum distance B to 0.41 times or more and 0.63 times or less the diameter of the bead core D, it is possible to achieve both of good rubber flow at the time of vulcanization molding and securing of rigidity of the bead core in the pneumatic tire obtained by vulcanization molding.
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 1/2 exceeding the minimum interval a, the shortest distance C is sufficiently ensured, whereby it is possible to prevent the bead wire 8 most adjacent to the outer contour of the bead core 6 from coming into contact with the carcass ply 5 due to rubber flow at the time of vulcanization molding, and to ensure the adhesiveness of the bead core 6 to the carcass ply 5.
(evaluation test)
The pneumatic tires produced by vulcanizing and molding the green tires 1 of comparative example 1 and example 1 were subjected to an evaluation test of the durability of the bead cores.
The green tire 1 of comparative example 1 is the green tire illustrated in fig. 4, and the green tire 1 of example 1 is the green tire illustrated 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 surface 6a and the inner surface 6b of the bead core 6 are convex curved surfaces, and the cross-sectional shape of the bead core 6 in the width direction is an arc shape having curvature radii α 1, α 2 of 5mm to 15 mm. In the bead core 6 included in the green tire 1 of example 1, the radii of curvature α 1, α 2 are 50% to 150% of the length L of the bead core 6 in the width direction. The specification for the bead core 1 is common in comparative example 1 and example 1. In particular, in any of comparative example 1 and example 1, 7 bead wires 8 are provided in the width direction of the bead core 6 and 8 bead wires are provided in the radial direction of the bead core 6.
As an evaluation method, the pneumatic tire was mounted on a 2t forklift and used until it was completely worn. The size of the pneumatic tire is 7.00-12, the rim size is 12X 7.00, and the air pressure is 1000 kPa. The presence or absence of failure of the bead core after use to complete wear was confirmed.
In the pneumatic tire manufactured from the green tire 1 of comparative example 1, a failure of the bead core 6 occurred in the middle of use. In contrast, no damage was found in the bead core 6 even after use in the pneumatic tire manufactured from the green tire 1 of example 1.
Claims (3)
1. A method of manufacturing a pneumatic tire, which manufactures a bead core by winding a band-shaped body a plurality of times in a longitudinal laminated state, wherein the band-shaped body is formed by covering a plurality of bead cores aligned in a row with a covering rubber, and the thickness of the center portion in the width direction is thicker than the thickness of both end portions in the width direction, the outer side surface in the radial direction of the bead core is convex toward the outer side in the radial direction in a cross section in the width direction of the bead core, the inner side surface in the radial direction of the bead core is convex toward the inner side in the radial direction in the cross section in the width direction of the bead,
and vulcanizing and molding the green tire with the bead core.
2. A method of manufacturing a pneumatic tire according to claim 1, wherein a minimum interval between two bead wires adjacent to each other in a radial direction of the bead core in a cross section in a width direction of the bead core is set to be 0.41 times or more and 0.63 times or less of a diameter of the bead core.
3. A method of manufacturing a pneumatic tire according to claim 2, wherein a shortest distance in the width direction of the bead core from the bead wire most adjacent to the outline of the bead core in the cross section in the width direction of the bead core exceeds 1/2 of the minimum interval.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017233252A JP2019098991A (en) | 2017-12-05 | 2017-12-05 | Green tire and manufacturing method of pneumatic tire |
| JP2017-233252 | 2017-12-05 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109927490A CN109927490A (en) | 2019-06-25 |
| CN109927490B true CN109927490B (en) | 2021-04-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811396858.9A Active CN109927490B (en) | 2017-12-05 | 2018-11-22 | Green tire and method for manufacturing pneumatic tire |
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| Country | Link |
|---|---|
| JP (1) | JP2019098991A (en) |
| CN (1) | CN109927490B (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP2019098991A (en) | 2019-06-24 |
| CN109927490A (en) | 2019-06-25 |
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