JP2021030671A - Pneumatic tire and mold for tire vulcanization - Google Patents

Abstract

To provide a pneumatic tire capable of protecting an emblem display part from damage and contamination, and a mold for tire vulcanization for manufacturing the pneumatic tire.SOLUTION: A pneumatic tire AT comprises: a tread part 102 having a tread surface; a pair of side parts 103 extending from both side parts of the tread part 102 to an inner diameter side; emblem display parts 112 for displaying emblems on external surfaces of the side parts 103; and covering parts 130 which continue from the external surfaces of the pneumatic tire AT and can cover the emblem display parts 112.SELECTED DRAWING: Figure 4

Description

The present invention relates to pneumatic tires and tire vulcanization molds.

On the outer surface of the side portion of the pneumatic tire, a mark display portion for displaying characters and marks such as a company name is provided. The mark display portion may be formed of colored rubber (for example, white rubber) in order to improve the appearance of the pneumatic tire. For example, Patent Document 1 discloses a pneumatic tire having such a mark display portion.

JP-A-2018-103487

Since the mark display is exposed on the outer surface of the pneumatic tire, there is a risk of damage or contamination when transporting the pneumatic tire. Since damage or contamination of the mark display is conspicuous as a product defect, it is required to protect the mark display from damage or contamination.

An object of the present invention is to provide a pneumatic tire capable of protecting a mark display portion from damage and contamination, and a tire vulcanization mold for manufacturing the pneumatic tire.

The first aspect of the present invention is a pneumatic tire, which has a tread portion having a tread surface, a pair of side portions extending from both side portions of the tread portion toward the inner diameter side, and a mark on the outer surface of the side portion. Provided is a pneumatic tire including a mark display portion for displaying a tire tread and a coating portion continuous from the outer surface of the pneumatic tire and capable of covering the mark display portion.

According to this configuration, since the mark display portion can be covered by the covering portion, it is possible to prevent the mark display portion from being damaged or contaminated during the transportation of the pneumatic tire. In particular, since the covering portion is continuous from the outer surface of the pneumatic tire, it is integrated with the outer surface of the pneumatic tire and is made of a rubber material. Since the rubber material coating has elasticity, the mark display can be suitably protected from external impact. Further, after the pneumatic tire is transported, it can be easily prevented from spoiling the aesthetic appearance of the product by removing the covering portion by cutting or the like.

The covering portion may be formed in a mesh shape. Further, the covering portion may be formed in a thin film shape. Further, the covering portion may be formed in a ladder shape.

According to these configurations, the elasticity of the covering portion can be ensured. Even when the position of the covering portion and the mark display portion are separated, the covering portion has elasticity, so that the covering portion can be extended to the mark display portion, and the mark display portion can be reliably protected.

The covering portion has a base end portion connected to the outer surface of the pneumatic tire and a tip end portion opposite to the base end portion, and the outer surface of the side portion has the tip end portion. A hooking portion for hooking the portion may be provided.

According to this configuration, the mark display portion can be reliably protected by the covering portion by hooking the tip end portion of the covering portion on the hooking portion. In particular, by adopting a configuration in which the tire is hooked rather than simply covered, it is possible to realize reliable protection of the mark display portion without breaking the protection by the covering portion even during transportation of the pneumatic tire.

A second aspect of the present invention includes a sector mold for vulcanizing the tread portion of the green tire into a predetermined shape, which is divided into a plurality of parts along the circumferential direction of the green tire, and the above-mentioned in the axial direction of the green tire. It is provided on both sides of the green tire and includes a pair of side molds for vulcanizing the side portions of the green tire into a predetermined shape, and at least one of the sector mold and the side mold is the sector mold and the side. Provided is a tire vulcanization mold having a concave covering portion forming groove extending from an inner surface on a fitting surface with the mold.

According to this configuration, the above-mentioned covering portion is formed by the covering portion forming groove. Therefore, since the mark display portion can be covered with the covering portion, it is possible to prevent the mark display portion from being damaged or contaminated during the transportation of the pneumatic tire.

According to the present invention, since the mark display portion can be protected by the covering portion, a pneumatic tire that protects the mark display portion from damage or contamination and a tire vulcanization mold for manufacturing the pneumatic tire are provided. Can be provided.

FIG. 3 is a partial cross-sectional view of a vulcanization molding machine equipped with a tire vulcanization mold according to the first embodiment of the present invention. FIG. 3 is a partial cross-sectional view showing a mold clamping operation of the tire vulcanization mold of FIG. FIG. 1 is a meridian half cross section of the tire vulcanization mold and the tire of FIG. The perspective view of the pneumatic tire in 1st Embodiment. The plan view which shows the mark display part of the pneumatic tire in 1st Embodiment. The plan view which shows the 1st modification of the covering part. The plan view which shows the 2nd modification of the covering part. The partial sectional view of the vulcanization molding machine which mounted the tire vulcanization mold which concerns on 2nd Embodiment. The plan view which shows the periphery of the mark display part of the pneumatic tire in 2nd Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows a state in which the tire vulcanization mold 2 according to the present embodiment is mounted on the vulcanization molding machine 1. A tire vulcanization mold 2 is attached between the upper platen 4 and the lower platen 5 of the vulcanization molding machine 1 via a container 6.

The upper platen 4 is fixed to the lower end of the elevating cylinder 7. The upper plate 3 is fixed to the lower end of the upper platen 4. An elevating rod 8 is arranged at the center of the elevating cylinder 7. An upper container plate 16 is fixed to the lower end of the elevating rod 8. The elevating cylinder 7 and the elevating rod 8 are elevated by a drive device (not shown). The upper container plate 16 and the upper platen 4 are configured to be able to move up and down independently. A flow path 4a is formed inside the upper platen 4. The temperature of the tire vulcanization mold 2 can be adjusted by flowing a heat exchange medium (for example, oil) in the flow path 4a.

Inside the lower platen 5, a flow path 5a through which the heat exchange medium flows is formed as in the upper platen 4. Then, by adjusting the temperature of the heat exchange medium, the tire vulcanization mold 2 can be set to a desired vulcanization temperature via the upper platen 4 and the lower platen 5. A bladder unit 9 is arranged at the center of the lower platen 5 in the tire radial direction.

The bladder unit 9 has a bladder 13 attached to an upper clamp 11 and a lower clamp 12 fixed to a support shaft 10 that can be raised and lowered. Air is supplied and discharged by an air supply / exhaust device (not shown) in the space surrounded by the upper clamp 11, the lower clamp 12, and the bladder 13. The bladder 13 is supplied with air and swells to the outer peripheral side to support the green tire GT from the inside. Here, the green tire GT indicates a raw tire before vulcanization molding.

The container 6 is composed of a segment 14, a jacket ring 15, an upper container plate 16, a lower container plate 17, and the like.

The segment 14 is screwed to each sector mold 20 of the tire vulcanization mold 2 described later. In the present embodiment, the segment 14 is composed of nine pieces, and the sector mold 20 is also composed of nine pieces corresponding to the segment 14. The inner surface of each segment 14 is along the outer surface of the sector mold 20, and the outer surface is composed of an inclined surface (conical surface on the outer peripheral side) that gradually swells toward the outer diameter side toward the lower side. Each segment 14 is supported by an upper slide 18 so as to be reciprocally movable in the radial direction.

The jacket ring 15 has a hollow cylindrical shape. The upper end surface of the jacket ring 15 is fixed to the upper plate 3, and the jacket ring 15 moves up and down according to the raising and lowering operation of the raising and lowering cylinder 7. The inner surface of the jacket ring 15 is composed of an inner peripheral conical surface that gradually inclines toward the outer diameter side toward the lower end side. The inner conical surface of the jacket ring 15 and the outer conical surface of each segment 14 slide along the conical surface so that they do not separate from each other (for example, due to a structure such as a tenon and a dovetail groove). There is. As a result, when the jacket ring 15 is lowered, the outer peripheral side conical surface of each segment 14 is pressed by the inner peripheral side conical surface, and the segments 14 in a state of expanding to the outer diameter side are connected in an annular shape on the inner diameter side. Can be moved to.

On the upper container plate 16, the upper slide 18 is fixed to the lower surface on the outer peripheral side, and the upper mold 21 described later is fixed to the lower surface on the inner peripheral side. The upper container plate 16 itself is fixed to the lower end of the elevating rod 8. As a result, when the elevating rod 8 moves up and down, the upper mold 21 and the segment 14 (including the sector mold 20 fixed to the segment 14) move up and down together with the upper container plate 16.

On the lower container plate 17, the lower slide 19 is fixed to the upper surface on the outer peripheral side, and the lower mold 22 described later is fixed to the upper surface on the inner peripheral side. A segment 14 is placed on the lower slide 19 at the time of mold clamping, and is slidably supported in the radial direction. The lower container plate 17 itself is fixed to the upper surface of the lower platen 5.

The tire vulcanization mold 2 is composed of a sector mold 20, an upper mold (side mold) 21, and a lower mold (side mold) 22.

The sector mold 20 is a mold for vulcanizing the tread portion of the green tire GT into a predetermined shape. The sector mold 20 is made of an aluminum alloy, is divided into a plurality of parts in the tire circumferential direction (here, divided into 9 parts), and is connected in an annular shape while being moved to the inner diameter side.

The upper mold 21 and the lower mold 22 are molds for vulcanizing the side portions of the green tire GT into a predetermined shape.

The upper mold 21 is formed in an annular shape, and the upper bead ring 23 is fixed to the inner peripheral portion. The upper mold 21 is fixed to the upper container plate 16 and moves up and down as the elevating rod 8 moves up and down. When descending, the upper bead ring 23 can hold down the bead portion of the green tire GT. As a result, the lower inner surface of the upper mold 21 and the lower surface of the upper bead ring 23 form a side portion and a bead portion of the tire.

The lower mold 22 is formed in an annular shape like the upper mold 21, and the lower bead ring 24 is fixed to the inner peripheral portion. The detailed shape of the lower mold 22 will be described later including the structure of the pneumatic tire AT to be molded.

2 (a) to 2 (f) are partial cross-sectional views showing a mold clamping operation of the tire vulcanization mold 2 of the present embodiment. In the present embodiment, the green tire GT is set in the vulcanization molding machine 1 equipped with the tire vulcanization mold 2 having the above-described configuration, the mold is closed, and then the mold is fastened to vulcanize the green tire GT. Perform molding. In addition, in FIGS. 2A to 2F, the detailed shape of the tire vulcanization mold 2 may be omitted in order to clarify the illustration.

In the mold-opened state shown in FIG. 2A, the green tire GT is placed on the lower mold 22 so that the axial direction thereof faces up and down. At this time, the bead portion located on the lower side is aligned with the lower bead ring 24.

As shown in FIG. 2B, air is subsequently supplied into the bladder 13 to expand it, and the outer surface thereof holds the inner surface of the green tire GT. As a result, the green tire GT is supported by the lower bead ring 24 and the bladder 13, and is in a non-contact state with the lower mold 22.

As shown in FIG. 2C, the upper mold 21 and the sector mold 20 are subsequently lowered by the elevating rod 8 and the elevating cylinder 7. Then, the upper bead ring 23 comes into contact with the bead portion located on the upper side of the green tire GT.

As shown in FIGS. 2 (d) and 2 (e), the green tire GT is subsequently pressed and deformed through the bead portion, and then the upper mold 21 comes into contact with the green tire GT. When the upper mold 21 descends to the mold clamping completion position, the green tire GT is in a state of being sandwiched between the upper mold 21 and the lower mold 22.

As shown in FIG. 2 (f), even after the upper mold 21 has descended to the mold clamping completion position, the elevating cylinder 7 continues to descend, and the jacket ring 15 is moved downward together with the upper plate 3. As a result, the inner peripheral conical surface of the jacket ring 15 presses the outer peripheral conical surface of the segment 14. Then, the sector mold 20 fixed to the segment 14 moves toward the inner diameter side.

As shown in FIGS. 2 (a) to 2 (f), vulcanization molding is executed after the mold clamping is completed, and after the molding is completed, the tire vulcanization mold 2 is opened by these reverse movements. , Green tire GT is a product, pneumatic tire AT (see FIG. 3).

FIG. 3 is a semi-cross-sectional view of the pneumatic tire AT formed by the tire vulcanization mold 2 of FIG. 1 and the sector mold 20 and the lower mold 22 used for molding in the tire meridian direction, and is taken along the tire equatorial line CL. On the other hand, only one side is shown. In FIG. 3, the tire width direction is indicated by a code TW, and the tire radial direction is indicated by a code TR.

The pneumatic tire AT includes a tread portion 102 having a tread surface 102a, a pair of side portions 103 extending inward in the tire radial direction connected to both outer end portions 102b on the outer side in the tire width direction of the tread portion 102, and each side portion 103. It is provided with a pair of bead portions 104 located at the inner diameter end of the tire. Inside the tread portion 102 and the side portion 103, a carcass ply 105 is arranged so as to be bridged between the pair of bead portions 104.

A belt layer 106 and a belt reinforcing layer 107 are sequentially arranged on the outer side of the carcass ply 105 of the tread portion 102 in the tire radial direction, and a tread rubber 110 is further arranged on the outer side. Inside the carcass ply 105, an inner ply 108 for holding the air pressure is arranged.

The bead portion 104 has an annular bead core 104a formed by rubber-coating a convergent body such as a steel wire, and an annular bead filler 104b having a triangular cross section that is connected to the bead core 104a and extends outward in the radial direction of the tire.

On the outer surface of the side portion 103, a mark display portion 112 that is convex outward in the tire width direction is formed on the inner diameter side in the tire radial direction with respect to the tire maximum width position W. An annular protector portion 114 is formed on the inner diameter side in the tire radial direction with respect to the mark display portion 112. The protector portion 114 projects outward in the tire width direction so as to protect the rim flange when mounted on a wheel (not shown).

A side rubber 120 is arranged on the outer side of the carcass ply 105 of the side portion 103 in the tire width direction. The pneumatic tire AT of the present embodiment has a so-called tread over sidewall (TOS) structure in which the outer end portion 102b of the tread portion 102 is arranged above the outer diameter end portion 120a of the side rubber 120. ..

The side rubber 120 has a black rubber 121 and a white rubber 122 (colored rubber) which is embedded in the black rubber 121 and whose surface is partially exposed corresponding to the mark display portion 112. In FIG. 3, the white rubber 122 is shown with hatching.

The black rubber 121 includes a pad rubber 121a arranged on the outer diameter end portion 120a, a side rubber 121b arranged on the inner diameter side thereof, and a rim strip rubber 121c arranged on the outer side of the bead portion 104 in the tire width direction. It has a thin cover rubber 121d that covers the surface of the white rubber 122.

The pad rubber 121a is arranged so as to alleviate a step at the joint portion between the tread portion 102 and the side portion 103. The side rubbers 121b extend between the pad rubber 121a and the rim strip rubber 121c in the tire radial direction, and more specifically, extend in pairs on both sides of the white rubber 122 in the tire radial direction. The protector portion 114 is formed on the side rubber 121b located on the inner diameter side in the tire radial direction. The rim strip rubber 121c is a portion that comes into contact with the rim flange when mounted on the wheel.

The white rubber 122 is arranged on the side rubber 120 toward the inner diameter side in the tire radial direction so as to be located at least corresponding to the mark display portion 112, and the outer surface is covered by vulcanization as described above. It is covered with rubber 121d.

The cover rubber 121d is removed by, for example, grinding at the edging portion 112a of the mark display portion 112, and as a result, the white rubber 122 is exposed corresponding to the edging portion 112a. The inner portion 112b surrounded by the edging portion 112a is black because it is made of the cover rubber 121d.

As shown in FIG. 3, the lower mold 22 (or upper mold 21) is formed corresponding to the shape of such a pneumatic tire AT. Specifically, the lower mold 22 is provided on the tire inner diameter side of the mark forming portion 22a for forming the mark display portion 112 of the pneumatic tire AT and the mark forming portion 22a to form the protector portion 114. It has a protector forming portion 22b for forming the tire.

In the present embodiment, the sector mold 20 has a concave covering portion forming groove 20c extending from the inner surface (contact surface with the pneumatic tire AT) 20a of the sector mold 20 on the fitting surface 20b with the lower mold 22. ..

In FIG. 3, a view seen from the direction VA perpendicular to the fitting surface 20b of the sector mold 20 and the lower mold 22 is shown in the broken line circle DC. In the present embodiment, the covering portion forming groove 20c is formed in a mesh shape. A mesh-like covering portion 130 is formed on the outer surface of the pneumatic tire AT by the covering portion forming groove 20c.

In FIG. 3, since the mark forming portion 22a is formed on the lower mold 22, the lower mold 22 is illustrated and described. However, when the mark forming portion is formed on the upper mold 21, the sector mold 20 may have a covering portion forming groove formed on the fitting surface in the same manner as for the upper mold 21. Alternatively, the covering portion forming groove may be formed on the fitting surface with the sector mold 20 in the upper mold 21 or the lower mold 22.

FIG. 4 shows a perspective view of a pneumatic tire AT having a covering portion 130. The covering portion 130 is formed so as to be continuous from the outer surface of the pneumatic tire AT and to cover the mark display portion 112. FIG. 4 shows a state in which the mark display portion 112 is covered with the mesh-like covering portion 130. Since the covering portion 130 is made of the same rubber material as the outer surface of the pneumatic tire AT, it has elasticity.

FIG. 5 is an enlarged plan view of the mark display unit 112 of FIG. The mark display unit 112 is a portion having a convex shape corresponding to a predetermined mark. In the present embodiment, the characters "T", "O", and "Y" are formed on the mark display unit 112.

With reference to FIGS. 4 and 5, the covering portion 130 is provided so as to be aligned with the position of the mark display portion 112. Specifically, the covering portion 130 is not provided in the entire tire circumferential direction, but is formed so that the mark display portion 112 and the tire circumferential direction are in phase with each other.

The covering portion 130 has a base end portion 131 connected to the outer surface of the pneumatic tire AT, and a tip end portion 132 at an end opposite to the base end portion 131. In the state where the covering portion 130 covers the mark display portion 112, the mark display portion 112 is located between the base end portion 131 on the outer diameter side and the tip portion 132 on the inner diameter side in the tire radial direction. Further, the size of the mesh of the covering portion 130 is set sufficiently smaller than the characters of the mark display portion 112, and the covering portion 130 protects the mark display portion 112 from an external impact.

The base end portion 131 has a convex shape on the outer surface of the tire. This makes it possible to prevent the surface of the pneumatic tire AT from being damaged when the covering portion 130 is removed. Specifically, when the covering portion 130 is cut using a cutter, the base end portion 131 of the covering portion 130 can be cut and removed without the cutting edge of the cutter coming into contact with the surface of the pneumatic tire AT. Further, even when the covering portion 130 is removed by hand, it is possible to prevent leaving a concave mark on the surface of the pneumatic tire AT.

According to the present embodiment, since the mark display portion 112 can be covered by the covering portion 130, it is possible to prevent the mark display portion 112 from being damaged or contaminated during the transportation of the pneumatic tire AT. In particular, since the covering portion 130 is continuous from the outer surface of the pneumatic tire AT, it is integrated with the outer surface of the pneumatic tire AT and is made of a rubber material. Since the rubber material covering portion has elasticity, the mark display portion 112 can be suitably protected from an external impact. Further, after the pneumatic tire AT is transported, the covering portion 130 is removed by cutting or the like, so that the aesthetic appearance of the product can be easily prevented from being spoiled.

Further, since the covering portion 130 has a mesh shape, the elasticity of the covering portion 130 can be ensured. As a result, even when the covering portion 130 and the mark display portion 112 are separated from each other, the covering portion 130 can be extended to the mark display portion 112 due to the elasticity of the covering portion 130, and the mark display can be displayed. The unit 112 can be reliably protected.

As described above, the covering portion 130 for protecting the mark display portion 112 can be easily formed by the covering portion forming groove 20c of the tire vulcanization mold 2.

In the above embodiment, various alternative shapes of the covering portion 130 can be considered as follows.

FIG. 6 is a plan view showing a first modification of the covering portion 130. As shown in FIG. 6, the covering portion 130 may be formed in a thin film shape. The fact that the mark display unit 112 is shown by a broken line means that the thin film as the covering portion 130 is arranged on the mark display unit 112. The thin film as the covering portion 130 has a thickness sufficient to ensure sufficient impact protection and elasticity.

FIG. 7 is a plan view showing a second modification of the covering portion 130. As shown in FIG. 7, the covering portion 130 may be formed in a ladder shape. The distance between the ladders is set sufficiently small with respect to the characters of the mark display unit 112, and the covering unit 130 protects the mark display unit 112 from external impact and contamination.

(Second Embodiment)
The tire vulcanization mold 2 of the second embodiment shown in FIG. 8 has a hook portion forming portion 22c. Other than the configuration relating to this, it is the same as that of the first embodiment. Therefore, the same parts as those shown in the first embodiment may be designated by the same reference numerals and the description thereof may be omitted.

In the present embodiment, the tire vulcanization mold 2 is provided with a hook portion forming portion 22c for forming the hook portion 133 (see FIG. 9). The hook portion forming portion 22c has a concave shape on the surface (inner surface) of the lower mold 22. Therefore, on the outer surface of the pneumatic tire AT, a hook portion 133 having a shape complementary to the hook portion forming portion 22c is formed.

FIG. 9 is a plan view of the vicinity of the mark display portion 112 of the pneumatic tire AT corresponding to FIG. 5 shown in the first embodiment. In the present embodiment, the hooking portions 133 have a columnar shape, and a plurality of hooking portions 133 are provided at substantially equal intervals in the tire circumferential direction. In the tire radial direction, the mark display portion 112 is located between the hook portion 133 and the base end portion 131. Therefore, the mark display portion 112 is covered by the covering portion 130 by hooking the tip portion 132 of the covering portion 130 on the hooking portion 133.

According to the present embodiment, the mark display portion 112 can be reliably protected by the covering portion 130 by hooking the tip portion 132 of the covering portion 130 on the hooking portion 133. In particular, by adopting a configuration in which the tire AT is hooked rather than simply covered, the protection by the covering portion 130 is not released even during the transportation of the pneumatic tire AT, and the protection of the mark display portion 112 can be surely realized.

In the present embodiment, the shape of the hooking portion 133 is illustrated as a columnar shape, but the shape of the hooking portion 133 is not particularly limited. The hooking portion 133 may have a convex shape from the outer surface of the pneumatic tire AT and may have a shape that allows the tip portion 132 of the covering portion 130 to be hooked.

Although specific embodiments of the present invention and variations thereof have been described above, the present invention is not limited to the above embodiments, and various modifications can be made within the scope of the present invention. For example, an embodiment of the present invention may be a combination of the contents of the individual embodiments as appropriate.

1 ... Vulcanization molding machine 2 ... Tire vulcanization mold 3 ... Upper plate 4 ... Upper platen 5 ... Lower platen 6 ... Container 7 ... Elevating cylinder 8 ... Elevating rod 9 ... Bladder unit 10 ... Support shaft 11 ... Upper clamp 12 ... Lower clamp 13 ... Bladder 14 ... Segment 15 ... Jacket ring 16 ... Upper container plate 17 ... Lower container plate 18 ... Upper slide 19 ... Lower slide 20 ... Sector mold 20a ... Inner surface 20b ... Fitting surface 20c ... Covering groove 21 ... Top mold (side mold)
22 ... Lower mold (side mold)
22a ... Mark forming part 22b ... Protector forming part 22c ... Hooking part forming part 23 ... Upper bead ring 24 ... Lower bead ring 102 ... Tread part 103 ... Side part 104 ... Bead part 105 ... Carcass ply 106 ... Belt layer 107 ... Belt Reinforcing layer 108 ... Inner ply 110 ... Tread rubber 112 ... Mark display part 114 ... Protector part 120 ... Side rubber 121 ... Black rubber 121a ... Pad rubber 121b ... Side rubber 121c ... Rim strip rubber 121d ... Cover rubber 122 ... White rubber 130 ... Covering part 131 ... Base end 132 ... Tip 133 ... Hook GT ... Green tire AT ... Pneumatic tire

Claims (6)

Pneumatic tires
The tread part with the tread surface and
A pair of side portions extending from both sides of the tread portion to the inner diameter side,
A mark display unit that displays a mark on the outer surface of the side portion,
A pneumatic tire including a covering portion that is continuous from the outer surface of the pneumatic tire and can cover the mark display portion. The pneumatic tire according to claim 1, wherein the covering portion is formed in a mesh shape. The pneumatic tire according to claim 1, wherein the covering portion is formed in a thin film shape. The pneumatic tire according to claim 1, wherein the covering portion is formed in a ladder shape. The covering portion has a base end portion connected to the outer surface of the pneumatic tire and a tip end portion opposite to the base end portion.
The pneumatic tire according to any one of claims 1 to 4, wherein a hooking portion for hooking the tip portion is provided on the outer surface of the side portion. A sector mold that is divided into a plurality of parts along the circumferential direction of the green tire and vulcanizes the tread portion of the green tire into a predetermined shape.
A pair of side molds arranged on both sides of the green tire in the axial direction of the green tire and for vulcanizing the side portions of the green tire into a predetermined shape are provided.
A tire vulcanization mold having at least one of the sector mold and the side mold having a concave covering portion forming groove extending from an inner surface on a fitting surface between the sector mold and the side mold.

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