JP4173711B2 - Method for manufacturing run-flat tires - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a run-flat tire, and more particularly to a method for manufacturing a run-flat tire that can manufacture a side-reinforced run-flat tire with minimal equipment.
[0002]
[Prior art]
As a run-flat tire having a radial structure that enables the vehicle to run even when punctured, for example, a so-called side-reinforced run in which a side reinforcing rubber 202 having a crescent cross section is disposed on the tire side as shown in FIG. There is a flat tire 200.
[0003]
In FIG. 8, reference numerals 204A and B are carcass, reference numeral 206 is a bead core, reference numeral 207 is a bead filler, reference numeral 208 is an inner liner, reference numeral 210 is a side wall, reference numeral 212 is a tread, reference numeral 214 is a belt, reference numeral 216 is a code. Chafer.
[0004]
Here, as a method of manufacturing a raw tire for a radial tire, an inner liner and a sidewall are wound on a band drum, a carcass ply and a bead core are set, and this is transferred to a shaping drum to set a belt, a tread, etc. There is a so-called single manufacturing method for forming a green tire.
[0005]
When forming a raw tire for a run-flat tire in this single manufacturing method, as shown in FIG. 11, the inner liner 208, the side reinforcing rubber 202, the first carcass ply 204A, and the second carcass ply 204B are combined with a band drum 209. The cylindrical intermediate member 218 integrated above needs to be disposed inside a bead core 206 held by a bead holder (not shown) as shown in FIG.
[0006]
In a normal radial tire, since the side reinforcing rubber 202 is not provided, the drum surface may be flat. However, in the case of a run flat tire, the thick side reinforcing rubber 202 is required. The side reinforcing rubber 202 is disposed in the groove 220 formed on the outer peripheral surface of the band drum 209 so as not to interfere, and the outer diameter r of the intermediate member 218 is kept smaller than the inner diameter R of the bead core 206.
[0007]
Such a grooved band drum 209 is described in, for example, Application No. 2001-270084.
[0008]
[Problems to be solved by the invention]
However, there are various widths and thicknesses of the side reinforcing rubber 202 depending on the tire size, and the groove 220 needs to have various sizes according to the size of the side reinforcing rubber 202.
[0009]
Therefore, in the multi-mix mixed flow production system, various band drums 209 having different sizes of the groove 220 must be prepared, and the groove corresponding to the volume of the side reinforcing rubber 202 is set to a specified width, volume, shape, and position. It is necessary to prepare. That is, a wide variety of band drums 209 are required, and there is a problem that installation space and equipment investment become very large.
[0010]
Although it is conceivable that the groove portion of the band drum 209 can be replaced as an adapter, the installation space may be small, but various adapters are necessary, and there is a problem that it takes time and effort to replace the adapter.
[0011]
The present invention has been made to solve the above problems, and an object of the present invention is to provide a method for manufacturing a run-flat tire that can efficiently manufacture a side-reinforced run-flat tire with a minimum of equipment. is there.
[0012]
[Means for Solving the Problems]
The invention according to claim 1 is a method for manufacturing a side-reinforcing run-flat tire in which a thick side reinforcing rubber for reinforcing the tire side portion is provided on the side portion of the carcass. A first step of attaching at least one carcass ply to the outer peripheral surface of the first drum using a single drum, and a pair of the first drum around which the carcass ply is wound and held by a bead setter A second step of inserting into the bead core and expanding the diameter of the first drum to join the carcass ply and the bead core to form a first tubular member; and reducing the diameter of the first drum And a third step of holding the first cylindrical member on the bead setter, and a second drum configured to be able to expand and contract and having a diameter that does not substantially change along the axial direction. of A fourth step of wrapping at least an inner liner and a side reinforcing rubber around the outer peripheral surface of the ram to form a second cylindrical member; and the first cylindrical member held by the bead setter in the first cylindrical member. The second drum holding the second cylindrical member is inserted, the diameter of the second drum is increased, and the outer surface of the second cylindrical member is pressure-bonded to the inner peripheral surface of the first cylindrical member. And a sixth step of forming a raw tire by winding a belt and a tread around the outer peripheral surface of the first cylindrical member, and charging and vulcanizing the raw tire into a mold. And in the fourth step, the outer diameter of the second drum is set in advance so that the outer diameter of the second cylindrical member is smaller than the inner diameters of the bead core and the first cylindrical member. It is characterized by that.
[0013]
Next, the manufacturing method of the run flat tire of Claim 1 is demonstrated.
[0014]
First, in the first step, at least one carcass ply is affixed to the outer peripheral surface of a first drum configured to be expandable / reducible.
[0015]
In the second step, the first drum around which the carcass ply is wound is inserted into a pair of bead cores held by a bead setter, and then the diameter of the first drum is expanded to join the carcass ply and the bead core. A first cylindrical member is formed.
[0016]
In the third step, the diameter of the first drum is reduced. Since the bead core of the first cylindrical member is held by the bead setter, the first cylindrical member is held by the bead setter by reducing the diameter of the first drum.
[0017]
In the fourth step, at least the inner liner and the side reinforcing rubber are wound around the outer peripheral surface of the second drum to form the second cylindrical member. In the fourth step, the outer diameter of the second drum is set in advance before the attachment so that the outermost diameter of the side reinforcing rubber wound around the outer peripheral surface is smaller than the inner diameter of the bead core.
[0018]
In the fifth step, the second drum holding the second cylindrical member is inserted into the first cylindrical member held by the bead setter to increase the diameter, and the second cylindrical member The outer surface is pressed against the inner peripheral surface of the first cylindrical member.
[0019]
In the sixth step, a raw tire is formed by winding a belt and a tread around the outer peripheral surface of the first cylindrical member, and the raw tire is loaded into a mold and vulcanized.
[0020]
In the method for producing a run-flat tire of the present invention, the first drum and the second drum around which the thick side reinforcing rubber is wound are generally used in the related art that can be expanded and contracted and the diameter does not substantially change in the axial direction. It is possible to use a conventional drum for forming a tire, and it is not necessary to use a special drum having grooves on the outer peripheral surface.
[0021]
The invention according to claim 2 is a method of manufacturing a side reinforcing type run flat tire in which a thick side reinforcing rubber for reinforcing the tire side portion is provided on the side portion of the carcass, and is configured to be expandable and contractible. A first step in which at least one carcass ply is affixed to an outer peripheral surface of the first drum using a first drum whose diameter does not change substantially along the axial direction; and the first step in which the carcass ply is wound A first drum is inserted into a pair of bead cores held by a bead setter, the diameter of the first drum is expanded, and the carcass ply and the bead core are joined to form a first cylindrical member. The third step of reducing the diameter of the first drum to hold the first cylindrical member to the bead setter, and the outer peripheral surface of the first drum using the first drum. In A fourth step of forming a second cylindrical member by winding at least an inner liner and a side reinforcing rubber; and the second cylinder inside the first cylindrical member held by the bead setter. A fifth step of inserting and expanding the diameter of the first drum holding the cylindrical member, and pressing the outer surface of the second cylindrical member to the inner peripheral surface of the first cylindrical member; And a sixth step of forming a green tire by winding a belt and a tread around the outer peripheral surface of one cylindrical member, and charging the green tire into a mold and vulcanizing and molding, In the step, the outer diameter of the first drum is preset so that the outer diameter of the second cylindrical member is smaller than the inner diameters of the bead core and the first cylindrical member. It is said.
[0022]
Next, a method for manufacturing the run flat tire according to claim 2 will be described.
[0023]
First, in the first step, at least one carcass ply is affixed to the outer peripheral surface of a first drum configured to be expandable / reducible.
[0024]
In the second step, the first drum around which the carcass ply is wound is inserted into a pair of bead cores held by a bead setter, and then the diameter of the first drum is expanded to join the carcass ply and the bead core. A first cylindrical member is formed.
[0025]
In the third step, the diameter of the first drum is reduced. Since the bead core of the first cylindrical member is held by the bead setter, the first cylindrical member is held by the bead setter by reducing the diameter of the first drum.
[0026]
In the fourth step, at least the inner liner and the side reinforcing rubber are wound around the outer peripheral surface of the first drum after the first cylindrical member is removed to form the second cylindrical member. In the fourth step, the outer diameter of the first drum before pasting is set in advance so that the outermost diameter of the side reinforcing rubber wound around the outer peripheral surface is smaller than the inner diameter of the bead core.
[0027]
In the fifth step, the first drum holding the second cylindrical member is inserted into the first cylindrical member held by the bead setter to increase the diameter of the second cylindrical member. The outer surface is pressed against the inner peripheral surface of the first cylindrical member.
[0028]
In the sixth step, a raw tire is formed by winding a belt and a tread around the outer peripheral surface of the first cylindrical member, and the raw tire is loaded into a mold and vulcanized.
[0029]
In the method for manufacturing a run-flat tire according to the present invention, the first drum around which the thick side reinforcing rubber is wound can be expanded / contracted and the diameter thereof has not changed substantially in the axial direction. It is not necessary to use a special drum having grooves on the outer peripheral surface.
[0030]
Further, in the method of manufacturing the run flat tire according to claim 2, since only one kind of drum is required, the equipment can be simplified as compared with the method of manufacturing the run flat tire according to claim 1.
[0031]
DETAILED DESCRIPTION OF THE INVENTION
[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.
[0032]
FIG. 1 shows a schematic configuration of a single stage type tire molding system.
[0033]
In the single stage type tire molding system 10 of the present embodiment, the second molding drum 12 and the first molding drum 14 are provided in parallel with each other.
[0034]
The second forming drum 12 includes a drum 12B that is rotatably supported with respect to the rotary drive main body 12A, has a constant diameter in the axial direction, and can be expanded and contracted.
[0035]
The second molding drum 12 is installed so as to be movable in the arrow R direction and the arrow L direction in FIG.
[0036]
On the arrow B direction side of the movement trajectory of the second molding drum 12, an inner liner attaching device 16 for attaching an inner liner 208 (see FIG. 8) is provided on the arrow R direction side with a first squeegee rubber (not shown). A first squeegee rubber affixing device 18 for affixing (A) is disposed on the arrow L direction side.
[0037]
A canvas chafer application device 20 for attaching a canvas chafer 216 (see FIG. 8) is disposed on the side of the arrow R direction on the side of the arrow R in the direction of the arrow F in the movement locus of the second molding drum 12. A side reinforcing rubber supply device 22 for attaching (see FIG. 8) is disposed on the arrow L direction side.
[0038]
Next, the first forming drum 14 includes a drum 14B that is rotatably supported with respect to the rotation drive main body 14A, has a constant diameter in the axial direction, and can be expanded and contracted.
[0039]
The first forming drum 14 is installed so as to be movable in the arrow R direction and the arrow L direction in FIG.
[0040]
A first ply sticking device 24 for sticking the first carcass ply 204A (see FIG. 8) is arranged on the arrow R direction side on the arrow F direction side of the movement trajectory of the first forming drum 14. The 2nd squeegee rubber sticking apparatus 26 which sticks a squeegee rubber (not shown) is arrange | positioned at the arrow L direction side.
[0041]
Further, a second ply sticking device 28 for sticking the second carcass ply 204B (see FIG. 8) is provided on the side of the movement path of the first forming drum 14 in the arrow B direction. It is arranged on the opposite side.
[0042]
A bead setter 30 holding a bead core 206 (see FIG. 8) is provided on the second molding drum 12 and the first molding drum 14 in the direction of arrow L so as to be movable in the directions of arrows F and B. It has been.
[0043]
The bead setter 30 includes a pair of annular BO rings 30 </ b> A each having a holding claw for holding the bead core 206.
[0044]
A shaping drum 40 is disposed on the opposite side of the bead setter 30 from the first molding drum side.
[0045]
Here, the second molding drum 12 and the first molding drum 14 are general tire molding drums that can be expanded and contracted and have a constant diameter in the axial direction (for example, Japanese Patent Application Laid-Open No. Hei 5). -Apparatus described in Japanese Patent No. -305682).
[0046]
The side reinforcing rubber 202 and the squeegee rubber have various thicknesses, widths, cross-sectional shapes, and the like depending on the type of tire. Therefore, it is preferable from the viewpoint of the number of parts and production efficiency to prepare and replace various base shapes. Absent. Therefore, a ribbon extruder is used for the side reinforcing rubber supply device 22, the first squeegee rubber affixing device 18, and the second squeegee rubber affixing device 26 of the present embodiment. For example, a ribbon shape as shown in FIG. The unvulcanized rubber 38 can be extruded and laminated in an arbitrary width, volume, cross-sectional shape, and position to form a desired side reinforcing rubber 202.
(Function)
Next, a tire manufacturing method using the single stage tire molding system 10 of the present embodiment will be described.
[0047]
First, in the second molding drum 12, the inner liner 208 is first wound around the drum 12 </ b> B using the inner liner applicator 16, and then the canvas chafer 216 is used on the inner liner 208 using the canvas chafer applicator 20. Further, the side reinforcing rubber 202 is wound using the side reinforcing rubber supply device 22.
[0048]
As a result, as shown in FIG. 2, an inner cylindrical member (band) 32 in which the inner liner 208, the canvas chafer 216, and the side reinforcing rubber 202 are integrated on the outer periphery of the drum 12B is obtained.
[0049]
Here, the outer diameter at the time of the diameter reduction of the drum 12B before member pasting is set in advance so that the outer diameter of the inner cylindrical member 32 is smaller than the inner diameter of the bead core 206 and the outer cylindrical member (ply case) 34 described later. Set it.
[0050]
In addition, you may wind a 1st squeegee rubber (not shown) around a required location using the 1st squeegee rubber sticking apparatus 18 as needed.
[0051]
On the other hand, in the first forming drum 14, the first carcass ply 204 </ b> A is first attached to the drum 14 </ b> B using the first ply attaching device 24, and then the second ply attaching device 28 is used to perform the second operation. The carcass ply 204B is pasted on the first carcass ply 204A.
[0052]
As a result, as shown in FIG. 3, the outer cylindrical member 34 is obtained in which the first carcass ply 204A and the second carcass ply 204B are integrated with the outer periphery of the drum 14B.
[0053]
In the first molding drum 14, if necessary, a second squeegee rubber affixing device 26 is used to place a second squeegee rubber (not shown) at a necessary location (for example, on the first carcass ply 204A, the second It may be wrapped around the carcass ply 204B or the like.
[0054]
The bead setter 30 holds a pair of bead cores 206.
[0055]
Next, the bead setter 30 is disposed on the arrow L direction side of the second forming drum 12, the second forming drum 12 is moved to the arrow L direction side, and the drum 12B is inserted inward of the bead core 206 (FIG. 4).
[0056]
Next, the diameter of the drum 12B is expanded, and the outer cylindrical member 34 is pressure-bonded to the bead core 206.
[0057]
Thereafter, the diameter of the drum 12B is reduced, the bead core 206 to which the outer cylindrical member 34 is attached is transferred to the bead setter 30 (see FIG. 5), and the second molding drum 12 is returned to the arrow R direction side.
[0058]
Next, the bead setter 30 is moved to the arrow L direction side of the first molding drum 14, the first molding drum 14 is moved to the arrow L direction side as shown in FIG. 6, and the inner cylindrical member 32 is moved to the outer cylinder. Insert into the inside of the member 34.
[0059]
Thereafter, the diameter of the drum 12B is increased, and the inner cylindrical member 32 is pressure-bonded to the outer cylindrical member 34.
[0060]
As a result, as shown in FIG. 7, a cylinder in which the inner liner 208, the canvas chafer 216, the side reinforcing rubber 202, the first carcass ply 204A, the second carcass ply 204B, the bead core 206, and the bead filler 207 are integrated. Member 36 is completed on drum 12B.
[0061]
Next, the diameter of the drum 12B is reduced, and the cylindrical member 36 is removed from the drum 12B and transferred to the shaping drum 40. Thereafter, the end portions of the first carcass ply 204A and the second carcass ply 204B are folded back as in the conventional manner. The wall 210 is attached, the diameter of the central portion is expanded, and the belt 214 and the tread 212 are attached to the carcass crown portion to complete the raw tire.
[0062]
Then, the run flat tire 200 as shown in FIG. 8 is obtained by vulcanizing a raw tire with a vulcanization mold.
[0063]
In this embodiment, since a special drum having grooves on the outer peripheral surface is not used, it is not necessary to prepare a drum according to the type of tire, and the run flat tire 200 can be efficiently manufactured with a minimum of equipment. Can do.
[Second Embodiment]
Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same structure as 1st Embodiment, and the description is abbreviate | omitted.
[0064]
FIG. 10 shows a schematic configuration of a single stage tire molding system 50 of the present embodiment.
[0065]
As shown in FIG. 10, in the single stage tire molding system 50, the second molding drum 12 is not provided, and the first ply pasting device 24 is disposed on the side of the side reinforcing rubber supply device 22 in the direction of arrow L, The 2nd squeegee rubber sticking apparatus 26 is arrange | positioned, and the 2nd ply sticking apparatus 28 is arrange | positioned in the arrow L direction side of the 1st squeegee rubber sticking apparatus 18. FIG.
(Function)
Next, a tire manufacturing method using the single stage tire molding system 50 of the present embodiment will be described.
[0066]
First, the first carcass ply 204A is pasted to the drum 14B of the first forming drum 14 using the first ply pasting device 24, and then the second ply pasting device 28 is used to The carcass ply 204B is pasted on the first carcass ply 204A.
[0067]
Thereby, the outer cylindrical member 34 in which the first carcass ply 204A and the second carcass ply 204B are integrated with the outer periphery of the drum 14B is obtained.
[0068]
The bead setter 30 holds a pair of bead cores 206.
[0069]
The first molding drum 14 is moved in the direction of the arrow L, and the drum 14B is inserted inward of the bead core 206.
[0070]
Next, the diameter of the drum 14 </ b> B is expanded, and the outer cylindrical member 34 is crimped to the bead core 206.
[0071]
Thereafter, the diameter of the drum 14 </ b> B is reduced, and the bead core 206 to which the outer cylindrical member 34 is attached is delivered to the bead setter 30.
[0072]
Next, the first molding drum 14 is moved in the direction of arrow R, the inner liner 208 is wound around the drum 14B using the inner liner applicator 16, and then the canvas chafer applicator 20 is placed on the inner liner 208. The canvas chafer 216 is wound around the side reinforcing rubber 202 using the side reinforcing rubber supply device 22.
[0073]
Thereby, the inner cylindrical member 32 in which the inner liner 208, the canvas chafer 216, and the side reinforcing rubber 202 are integrated on the outer periphery of the drum 14B is obtained.
[0074]
In addition, you may wind a 1st squeegee rubber (not shown) around a required location using the 1st squeegee rubber sticking apparatus 18 as needed.
[0075]
Next, the first forming drum 14 is moved in the direction of the arrow L, and the inner cylindrical member 32 is inserted into the outer cylindrical member 34.
[0076]
Thereafter, the diameter of the drum 14B is increased, and the inner cylindrical member 32 is pressure-bonded to the outer cylindrical member 34.
[0077]
Accordingly, the cylindrical member 36 in which the inner liner 208, the canvas chafer 216, the side reinforcing rubber 202, the first carcass ply 204A, the second carcass ply 204B, the bead core 206, and the bead filler 207 are integrated is formed on the drum 14B. Complete.
[0078]
The subsequent steps are the same as those in the first embodiment.
[0079]
Also in this embodiment, since a special drum having grooves on the outer peripheral surface is not used, it is not necessary to prepare a drum according to the type of tire, and the run flat tire 200 is efficiently manufactured with a minimum of equipment. be able to.
[0080]
Furthermore, in this embodiment, since the 2nd shaping | molding drum 12 used with the single stage type tire shaping | molding system 10 of 1st Embodiment is not provided, manufacturing equipment is simplified rather than 1st Embodiment. be able to.
[0081]
【The invention's effect】
As described above, according to the method of manufacturing a run-flat tire of the present invention, there is an excellent effect that a side-reinforced run-flat tire can be efficiently manufactured with a minimum of equipment.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram of a single stage tire forming system according to a first embodiment.
FIG. 2 is a cross-sectional view of a first molding drum to which an inner liner, a canvas chafer, and side reinforcing rubber are attached.
FIG. 3 is a cross-sectional view of a second molding drum to which a first carcass ply and a second carcass ply are attached.
FIG. 4 is a cross-sectional view of a second forming drum showing a state in which an outer cylindrical member is formed.
FIG. 5 is a cross-sectional view of a bead setter holding an outer cylindrical member.
FIG. 6 is a cross-sectional view showing a part of a bead setter and a first molding drum showing a state in which an inner cylindrical member is inserted into an outer cylindrical member.
FIG. 7 is a cross-sectional view of a first forming drum showing a state in which a cylindrical member is formed.
FIG. 8 is a cross-sectional view showing an example of a run flat tire.
FIG. 9 is a cross-sectional view of a side reinforcing rubber formed by laminating ribbon-like unvulcanized rubber.
FIG. 10 is an overall configuration diagram of a single stage type tire molding system according to a second embodiment.
FIG. 11 is a cross-sectional view showing a conventional band drum.
FIG. 12 is a cross-sectional view of a band drum and a bead core showing a state in which a conventional band drum is inserted into the bead core.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Single stage type tire shaping | molding system 12 2nd shaping | molding drum 14 1st shaping | molding drum 30 Bead setter 32 Inner cylindrical member 32 Inner cylindrical member 34 Outer cylindrical member 36 Cylindrical member 50 Single stage type tire molding system 200 Run flat tire 202 Side Reinforcing rubber 204A Carcass ply 204B Carcass ply 208 Inner liner 210 Side wall 212 Tread 214 Belt 216 Canvas chafer

Claims (2)

A method of manufacturing a side-reinforcing run-flat tire in which a thick-wall side reinforcing rubber for reinforcing a tire side portion is provided on a side portion of a carcass,
A first step of using a first drum configured to be expandable and contractible, and affixing at least one carcass ply to the outer peripheral surface of the first drum;
The first drum around which the carcass ply is wound is inserted into a pair of bead cores held by a bead setter, the first drum is expanded in diameter, and the carcass ply and the bead core are joined to each other. A second step of forming a tubular member;
A third step of reducing the diameter of the first drum and holding the first tubular member on the bead setter;
Using a second drum that can be expanded and contracted and whose diameter does not change substantially along the axial direction, at least an inner liner and a side reinforcing rubber are wound around the outer peripheral surface of the second drum to form a second cylindrical shape. A fourth step of forming a member;
The second drum holding the second cylindrical member is inserted into the first cylindrical member held by the bead setter, and the diameter of the second drum is increased to increase the first cylinder. A fifth step of crimping the outer surface of the second cylindrical member to the inner peripheral surface of the cylindrical member;
A sixth step of forming a green tire by winding a belt and a tread around the outer peripheral surface of the first tubular member, and charging and vulcanizing the green tire into a mold;
Have
In the fourth step, the outer diameter of the second drum is set in advance so that the outer diameter of the second cylindrical member is smaller than the inner diameters of the bead core and the first cylindrical member. A method for producing a run-flat tire characterized by the above. A method of manufacturing a side-reinforcing run-flat tire in which a thick-wall side reinforcing rubber for reinforcing a tire side portion is provided on a side portion of a carcass,
A first step of using a first drum that is configured to be expandable and contractible and whose diameter does not substantially change along the axial direction, and affixing at least one carcass ply to the outer peripheral surface of the first drum;
The first drum around which the carcass ply is wound is inserted into a pair of bead cores held by a bead setter, the first drum is expanded in diameter, and the carcass ply and the bead core are joined to each other. A second step of forming a tubular member;
A third step of reducing the diameter of the first drum and holding the first tubular member on the bead setter;
A fourth step of forming the second tubular member by using the first drum and winding at least an inner liner and a side reinforcing rubber around the outer peripheral surface of the first drum;
The first drum holding the second cylindrical member is inserted into the first cylindrical member held by the bead setter to expand the diameter, and the outer surface of the second cylindrical member A fifth step of pressure bonding the inner circumferential surface of the first tubular member;
A sixth step of forming a green tire by winding a belt and a tread around the outer peripheral surface of the first tubular member, and charging and vulcanizing the green tire into a mold;
Have
In the fourth step, the outer diameter of the first drum is set in advance so that the outer diameter of the second cylindrical member is smaller than the inner diameters of the bead core and the first cylindrical member. A method for producing a run-flat tire characterized by the above.

Images