JP2025022589A - Green tire building device and tire manufactured using the same - Google Patents

Abstract

The present invention provides a green tire building device capable of building a plurality of types of green tires including bead cores with different inner diameters, and a tire manufactured using the same.
[Solution] The green tire building device 1 includes a deck section 12, a bead lock section 13, and an outer diameter regulating section 15. The deck section 12 includes a plurality of deck segments 25 that expand and contract in diameter. The bead lock section 13 includes a plurality of lock segments 30 that press and support the bead core Bc from the radially inner side. The lock segments 30 are movable between a first diameter expansion position P1 for supporting a bead core B1 having a first inner diameter and a second diameter expansion position P2 for supporting a bead core B2 having a second inner diameter. The outer diameter regulating section 15 regulates the deck segment 25 to a first outer diameter Q1 when the lock segment 30 is in the first diameter expansion position P1, and regulates the deck segment 25 to a second outer diameter Q2 when the lock segment 30 is in the second diameter expansion position P2.
[Selected figure] Figure 2

Description

The present invention relates to a green tire building device and tires manufactured using the same.

The following Patent Document 1 describes a green tire building device that attaches bead cores to both axial sides of a cylindrical tire case and expands the case body axially inward of the bead cores into a toroidal shape. This green tire building device includes a central drum that can be expanded or contracted to hold the case body, and a bead lock means that can be expanded or contracted to hold the bead cores via the tire case.

JP 2012-152953 A

In recent years, it has become desirable to use such green tire building equipment to build multiple types of green tires, including bead cores with different inner diameters. In this case, it is necessary to expand the diameter of the deck section around which the carcass ply is wound, and the beadlock section supporting the bead core, to a distance appropriate to the inner diameter of each bead core. The expansion of the beadlock section is restricted by the bead core. However, there is room for further consideration regarding the expansion of the deck section.

The present invention was devised in consideration of the above-mentioned circumstances, and aims to provide a green tire building device that can regulate the expansion position of the deck segments to build multiple types of green tires including bead cores with different inner diameters, and a tire manufactured using the same.

A raw tire building device, comprising: a substantially cylindrical deck section for winding a carcass ply into a cylindrical shape; a pair of bead lock sections for supporting a pair of bead cores that are outer-layered on the cylindrical carcass ply; and an outer diameter regulating section for regulating the outer diameter of the deck section, the deck section comprising a plurality of deck segments arranged in the circumferential direction to form a substantially cylindrical outer peripheral surface; and a deck drive section for expanding and contracting the deck segments, the pair of bead lock sections comprising a plurality of lock segments arranged in the circumferential direction, and a pair of bead lock sections for expanding and contracting the carcass ply by expanding the lock segments. The green tire building device includes a bead lock drive unit for pressing and supporting the bead core from the radially inner side via the ply, the lock segment is movable at least between a first diameter expansion position for supporting a bead core having a first inner diameter and a second diameter expansion position for supporting a bead core having a second inner diameter smaller than the first inner diameter, and the outer diameter restriction unit restricts the deck segment to a first outer diameter when the lock segment is in the first diameter expansion position, and restricts the deck segment to a second outer diameter smaller than the first outer diameter when the lock segment is in the second diameter expansion position.

By adopting the above configuration, the green tire building device of the present invention can regulate the expansion position of the deck segments and build multiple types of green tires including bead cores with different inner diameters.

1 is a side view conceptually showing an example of a green tire building line in which the green tire building apparatus of the present invention is adopted. FIG. 2 is an enlarged cross-sectional view showing a main part of the green tire building apparatus. FIG. 2 is an enlarged cross-sectional view of the green tire building apparatus. 1A is an enlarged cross-sectional view of a green tire building apparatus, FIG. 1B is a view taken along the line A-A in FIG. 1A, and FIG. 1C is a cross-sectional view taken along the line A-A in FIG. FIG. 1A is a cross-sectional view illustrating restricting the deck segment to a second outer diameter, and FIG. 1B is a cross-sectional view illustrating restricting the deck segment to a first outer diameter.

Below, one embodiment of the present invention will be described with reference to the drawings. The drawings include exaggerated expressions and expressions that differ from the dimensional ratios of the actual structure in order to facilitate understanding of the present invention. Furthermore, when there are multiple embodiments, identical or common elements are given the same reference numerals throughout the specification, and duplicate explanations will be omitted.

Figure 1 is a side view conceptually showing a green tire building line T using a green tire building device (hereinafter sometimes simply referred to as a "building device") 1 of this embodiment. As shown in Figure 1, the green tire building line T of this embodiment includes the building device 1, a carcass forming former 100, a carcass transfer device 101, a tread forming former 102, a tread transfer device 103, and a bead core transfer device (not shown).

The carcass forming former 100 has a carcass drum 100a, and a cylindrical carcass ply A is formed by winding a sheet member for the carcass ply (not shown) on its outer circumferential surface. The carcass transfer device 101 transfers the carcass ply A on the carcass drum 100a to the molding device 1. The tread forming former 102 has a tread drum 102a, and a cylindrical tread ring C is formed by winding a tread rubber (not shown) on its outer circumferential surface. The tread transfer device 103 transfers the tread ring C on the tread drum 102a to a predetermined position radially outward of the carcass ply A held by the molding device 1 and holds it there. The bead core transfer device (not shown) transfers a pair of annular bead cores Bc and a bead apex rubber Ba placed on the outer circumferential surface of each bead core Bc to a predetermined position radially outward of the carcass ply A held by the molding device 1 and holds them there.

The carcass ply A may include, for example, sidewall rubber, inner liner rubber, bead reinforcing layer, clinch rubber, etc., depending on the tire structure. The tread ring C may include, for example, tread reinforcing plies such as belt plies and band plies, depending on the tire structure. Furthermore, the raw tire molding line T is not limited to such an embodiment, and for example, a cylindrical carcass ply A may be formed by wrapping a sheet member for the carcass ply around the molding device 1.

The molding device 1 of this embodiment is as follows:
(1) While holding each bead core Bc via the carcass ply A, the main body portion Aa of the carcass ply A located between the bead cores Bc, Bc is expanded in diameter to a predetermined position,
(2) The protruding portion Ab of the carcass ply A located axially outward from the bead core Bc is folded back around the bead core Bc and pressed against the main portion Aa of the carcass ply A to be joined (first joining step),
(3) The main body portion Aa to which the protruding portion Ab is joined is expanded to form a toroidal shape, and the expanded portion is pressed against and joined to the radial inner surface of the tread ring C (second joining step), thereby forming a green tire.
The first joining step and the second joining step are the same as those in the conventional art. Note that the raw tire is put into a vulcanizing device (not shown) to manufacture a vulcanized tire (e.g., a pneumatic tire).

The molding device 1 of the present invention can mold both a green tire (not shown) that includes a bead core B1 (shown in FIG. 5(B)) with a first inner diameter, and a green tire (not shown) that includes a bead core B2 (shown in FIG. 5(A)) with a second inner diameter smaller than the first inner diameter. In this way, the molding device 1 of this embodiment can mold green tires for manufacturing pneumatic tires with different rim diameters (nominal rim diameters). The difference between the first inner diameter and the second inner diameter is, for example, 1 inch. The "nominal rim diameter" is synonymous with the "nominal rim diameter" included in the "tire designation" in the JATMA standard.

The molding device 1 of this embodiment includes a drum central shaft portion 3 and a pair of drums 4, 4 that are supported so as to be movable toward and away from each other in the axial direction of the drum central shaft portion 3. A cylindrical carcass ply A is stretched across both drums 4. In this specification, the axial, radial, and circumferential directions of the drum central shaft portion are simply referred to as the axial, radial, and circumferential directions, respectively. The axial direction of the drum central shaft portion coincides with the axial direction of the carcass ply A on the drum 4 and the axial direction of the bead core Bc that is outer-layered on the carcass ply A. The same applies to the radial and circumferential directions.

Figure 2 is a partial cross-sectional view of a portion of the molding device 1. As shown in Figure 2, in this embodiment, the drum central shaft portion 3 includes a drum shaft 16 and a rotating cylinder 17 arranged concentrically on the radially outer side of the drum shaft 16. The rotating cylinder 17 is supported by the drum shaft 16 via a bearing, and can rotate independently of the drum shaft 16. A first drive motor (not shown) that drives the drum shaft 16 to rotate is connected to one end of the drum shaft 16. In addition, a second drive motor (not shown) that rotates the rotating cylinder 17 is connected to one end of the rotating cylinder 17.

The drum shaft 16 is a threaded shaft having a right-hand threaded portion (not shown) that forms a right-hand thread, and a left-hand threaded portion 16A that forms a left-hand thread. One drum 4 is movably supported on the right-hand threaded portion, and the other drum 4 is movably supported on the left-hand threaded portion 16A. A nut fitting 18 is rotatably coupled to each of the right-hand threaded portion and the left-hand threaded portion 16A. The rotating cylinder 17 includes a moving body 19 that can move in the axial direction. The moving body 19 is connected to the nut fitting 18 via a one-way clutch.

Each drum 4 includes a movable base 11, a deck section 12, a beadlock section 13, and an outer diameter regulating section 15. The movable base 11 is supported by the drum central shaft section 3 so as to be movable relative to the drum shaft 16 and move toward and away from each other. The movable base 11 is rotated integrally with the rotating cylinder 17 by the second drive motor. In this embodiment, each movable base 11 is supported so as to be movable in and out of the axial direction. For example, one movable base 11 may be fixed, and only the other movable base 11 may be supported so as to be movable in the axial direction.

The mobile base 11 comprises a cylindrical mobile base body 20 that is fitted onto the outer circumferential surface of the rotating cylinder 17 so as to be freely slidable in the axial direction, and a cylindrical support body 21 that is fixed concentrically to the mobile base body 20. The support body 21 supports the deck section 12. The mobile base body 20 and the moving body 19 are connected so as to be movable together.

The support body 21 has a first cylinder chamber 22 inside. The first cylinder chamber 22 includes a first horizontal cylinder chamber 22A that is concentric with the support body 21 and extends inward and outward in the axial direction, and a first vertical cylinder chamber 22B that is a circumferential groove that extends radially outward from the axial outer end of the first horizontal cylinder chamber 22A.

The mobile base body 20 has a second cylinder chamber 23 therein. The second cylinder chamber 23 includes a second horizontal cylinder chamber 23A that is annular and concentric with the mobile base body 20 and extends axially inward and outward, and a second vertical cylinder chamber 23B that is circumferentially grooved and extends radially outward from the axially inner side of the second horizontal cylinder chamber 23A. In this embodiment, the second vertical cylinder chamber 23B is formed between the mobile base body 20 and the support 21.

Figure 3 is a partially enlarged view of the molding device 1. Figure 3 shows the molding device 1 in a state (reduced diameter state Y) in which the bead core Bc is arranged radially outwardly and spaced apart from the carcass ply A. As shown in Figures 2 and 3, the deck section 12 includes a plurality of deck segments 25 arranged in the circumferential direction to form a substantially cylindrical outer circumferential surface 12a, and a deck drive section 26 for expanding and contracting the deck segments 25.

The deck drive unit 26 includes a plurality of deck guides 27 that are arranged circumferentially to support the plurality of deck segments 25 so that the diameter of the deck segments 25 can be expanded and that can move radially, and a lateral piston 28 that can come into contact with each deck guide 27 and can move axially.

The deck segment 25 has, for example, a radial outer end surface 25a that holds the main body portion Aa of the carcass ply A. The deck guide 27 is configured to be movable inward and outward in the radial direction while being guided by the wall surface of the first vertical cylinder chamber 22B. A roller R1 is attached to the radial lower end of the deck guide 27. The horizontal piston 28 is configured to be able to move inward and outward in the axial direction within the first horizontal cylinder chamber 22A by the inflow and outflow of the working air. The horizontal piston 28 is ring-shaped, and the axial outer end is formed as a cone surface (cone-shaped surface) 28a. Such a deck drive unit 26 can convert the axial movement of the horizontal piston 28 into radial movement of the deck guide 27 by abutting the cone surface 28a with the roller R1, thereby expanding and contracting the deck segment 25.

Figure 4 (A) is an enlarged view of Figure 3. Figure 4 (B) is a front view of the deck section 12 and the beadlock section 13 as viewed from the radial outside. Figure 4 (C) is a cross-sectional view of line A-A in (B). As shown in Figures 3 and 4, the deck guide 27 of this embodiment includes a block-shaped deck main section 27a to which a roller R1 is attached, and a pair of deck secondary sections 27b, 27b located on both sides of the deck main section 27a in the axial direction. The thickness (circumferential length) t2 of the deck secondary section 27b is formed to be smaller than the thickness t1 of the deck main section 27a.

The beadlock section 13 is disposed adjacent to the axially outer side of the deck section 12. The beadlock section 13 includes a plurality of lock segments 30 arranged in the circumferential direction, and a beadlock drive section 31 for pressing and supporting the bead core Bc from the radially inner side via the carcass ply A by expanding the diameter of the lock segments 30.

The beadlock drive unit 31 includes a plurality of lock guides 32 arranged circumferentially to support the plurality of lock segments 30 so that the lock segments 30 can be expanded, and which are movable in the radial direction, and a horizontal piston 33 which can come into contact with each lock guide 32 and move in the axial direction.

The lock segment 30 has a radial outer end surface 30a that holds the bead core Bc via the carcass ply A. The lock guide 32 is configured to be movable inward and outward in the radial direction while being guided by the wall surface of the second vertical cylinder chamber 23B. A roller R2 is attached to the radial lower end of the lock guide 32. The horizontal piston 33 is configured to be able to move inward and outward in the axial direction within the second horizontal cylinder chamber 23A by the inflow and outflow of working air. The horizontal piston 33 is ring-shaped, and the axial inner end is formed as a cone surface (cone-shaped surface) 33a. Such a bead lock drive unit 31 converts the axial movement of the horizontal piston 33 into radial movement of the lock guide 32 by abutting the cone surface 33a with the roller R2, and can expand and contract the lock segment 30.

The lock guide 32 of this embodiment includes a block-shaped main lock portion 34a to which the roller R2 is attached, and a pair of secondary lock portions 34b, 34b located on both axial sides of the main lock portion 34a. The thickness (circumferential length) t4 of the secondary lock portion 34b is smaller than the thickness t3 of the main lock portion 34a.

In this embodiment, the deck guide 27 and the lock guide 32 are guided and supported by the first support portion 21A of the support body 21, and are vertically movable. In this embodiment, the first support portion 21A is located axially between the deck guide 27 and the lock guide 32. In this embodiment, the first support portion 21A includes a first guide 35a that guides the deck sub-portion 27b located axially outside the deck main portion 27a, a second guide 35b that guides the lock sub-portion 34b located axially inside the lock main portion 34a, and a radial outer end surface 35c. In this embodiment, the first guide 35a and the second guide 35b are arranged with a circumferential offset.

In this embodiment, the lock guide 32 and the deck guide 27 are arranged so that they do not face each other in the circumferential direction. In this embodiment, the circumferential center line 32c of the lock guide 32 and the circumferential center line 27c of the deck guide 27 are misaligned at an angle θ of 3 to 10 degrees around the rotation axis 3c of the drum central shaft portion 3. This eliminates interference between the mechanisms of the lock guide 32 and the deck guide 27 that are adjacent in the axial direction, and ensures space for arranging new parts, etc.

The outer diameter regulating portion 15 has the function of regulating the outer diameter (expansion) of the deck portion 12. In this embodiment, the outer diameter regulating portion 15 includes a first protrusion 15A that protrudes from the deck segment 25 toward the lock segment, and a second protrusion 15B that is provided on the deck segment side of the lock segment 34 and abuts against the radial outside of the first protrusion 15A.

The first protrusion 15A is provided on the deck guide 27. The first protrusion 15A is provided on the deck sub-portion 27b of the deck guide 27. In this embodiment, the first protrusion 15A is disposed at a position radially inward from the radial outer end of the deck guide 27.

The first protrusion 15A is formed, for example, in a block shape. In this embodiment, the first protrusion 15A is arranged so as to be offset in the circumferential and radial directions from the locking sub-part 34b of the lock guide 32, and is not in contact with the locking sub-part 34b. This ensures a large working space for mounting the first protrusion 15A on the deck guide 27. The first protrusion 15A is arranged, for example, so as not to come into contact with the locking main part 34a.

In this embodiment, the second protrusion 15B is formed integrally with the lock segment 30. The second protrusion 15B forms, for example, a part of the outer end surface 30a of the lock segment 30, and is located on the opposite radial side (inner side) of the outer end surface 30a, and has an inner surface 15d that abuts against the first protrusion 15A.

As shown in FIG. 2, the drum 4 of this embodiment further includes a folding tool 14 that folds the protruding portion Ab around the bead core Bc and presses it against the main body portion Aa to join it.

The folding tool 14 of this embodiment includes a slide body 36, a rubber bladder 37, and multiple winding arms 38. The slide body 36 is supported by the moving base 11, for example, on the axial outside of the beadlock portion 13 so as to be movable inward and outward in the axial direction. The rubber bladder 37 extends inward and outward in the axial direction, for example, passing between the lock segment 30 and the carcass ply A, and is expandable. The winding arms 38 are housed, for example, in the rubber bladder 37, and are movable in the radial and axial directions.

The slide body 36 is cylindrical and fitted onto the outer circumferential surface of the mobile base body 20 so that it can slide freely in and out in the axial direction, and is operated by a driving means 40. This driving means 40 includes a cylinder hole 41 that extends axially inward from the axially outer end surface of the mobile base body 20, and a piston 42 that can move axially inward and outward within the cylinder hole 41 by the entry and exit of working air. The piston 42 and slide body 36 are connected by a connecting shaft 43 that extends axially outward from the piston 42.

In this embodiment, the rubber bladder 37 has its inner end 37a attached to the support 21, extends axially outward from the inner end 37a over the outer circumferential surface of the deck section 12, and is folded into a U-shape, after which the outer end 37b is attached to the slide body 36. The rubber bladder 37 expands when filled with internal pressure, causing the protruding portion Ab to begin folding back. The protruding portion Ab is folded back by, for example, increasing the pressing force against the main body portion Aa by a cylindrical pusher (not shown).

The winding arms 38 are spaced apart in the circumferential direction. The axial outer end of each winding arm 38 is pivoted at a first pivot point K1 provided on the slide body 36, and a pressing roller 44 is pivotally attached to the axial inner end. When the slide body 36 moves axially inward, the winding arm 38 presses the protruding portion Ab, which has started to fold back, against the radial outer circumferential surface of the main body portion Aa via the rubber bladder 37, and adheres it. Note that the folding tool 14 is not limited to this embodiment, and may have, for example, either the rubber bladder 37 or multiple winding arms 38.

Next, a method of using such a molding device 1 to support a bead core B1 with a first inner diameter and a bead core B2 with a second inner diameter smaller than the first inner diameter with the bead lock portion 13, and then regulating the outer diameter (expansion) of the deck portion 12 will be described.

Figure 5 (A) is a partial cross-sectional view of the molding device 1 in a state where the bead core B2 of the second inner diameter is held by the lock segment 30 (second expanded state X2). Figure 5 (B) is a partial cross-sectional view of the molding device 1 in a state where the bead core B1 of the first inner diameter is held by the lock segment 30 (first expanded state X1). As shown in Figures 3 and 5, the lock segment 30 is expanded by the bead lock drive unit 31 from the reduced diameter state Y shown in Figure 3 until it abuts against the radial inner circumferential surface Bi of each bead core B1, B2 via the carcass ply A. In this way, in the molding device 1 of this embodiment, the expansion of the lock segment 30 is restricted by the inner circumferential surface Bi of each bead core B1 and B2, which has high rigidity (is less likely to deform). In addition, the lock segment 30 of this embodiment is movable at least between a first expanded position P1 for supporting the bead core B1 of the first inner diameter and a second expanded position P2 for supporting the bead core B2 of the second inner diameter. In this manner, in the reduced diameter state Y, the first protrusion 15A is contained within the first support portion 21A. In addition, in the reduced diameter state Y, the second protrusion 15B of the lock segment 30 abuts against the outer end surface 35c.

Following the expansion of the lock segment 30, the outer diameter of the deck section 12 is expanded. The outer diameter of the deck section 12 is expanded by expanding the deck segment 25 with the deck drive section 26. At this time, the first convex portion 15A provided on the deck guide 27 abuts against the second convex portion 15B of the expanded lock segment 30. Since the lock segment 30 abuts against the inner peripheral surfaces Bi of the bead cores B1 and B2, the outer diameter (expansion) of the deck segment 25 is restricted.

Specifically, the outer diameter regulating unit 15 regulates the deck segment 25 to a first outer diameter Q1 when the lock segment 30 is in the first expanded position P1 (shown in FIG. 5B). Also, the outer diameter regulating unit 15 regulates the deck segment 25 to a second outer diameter Q2 smaller than the first outer diameter Q1 when the lock segment 30 is in the second expanded position P2 (shown in FIG. 5A). The first outer diameter Q1 is a distance suitable for the bead apex rubber Ba to bend into the main body portion Aa, for example, a position radially outward from the first expanded position P1. Similarly, the second outer diameter Q2 is, for example, a position radially outward from the second expanded position P2. In particular, it is preferable for the bead apex rubber Ba to be folded down by expanding the diameter of the deck portion 12 to a height position where the radial outer surface of the main body portion Aa held by the deck portion 12 exceeds the radial outer surface of each bead core B1, B2 in the radial direction. In addition, the main body portion Aa of the carcass ply A and the bead apex rubber Ba are firmly attached to each other.

In this way, the molding device 1 of the present invention uses the expansion position of the lock segment 30 that abuts (through the carcass ply A) against the bead core Bc, which has high rigidity (is less likely to deform), to regulate (position) the outer diameter (expansion) of the deck segment 25. As a result, the molding device 1 of this embodiment can mold a raw tire that includes a bead core B1 with a first inner diameter, and a raw tire that includes a bead core B2 with a second inner diameter.

Based on the gist of the present invention, such a molding device 1 can further mold a green tire having, for example, a bead core B1 of a first inner diameter, a bead core B2 of a second inner diameter, and a bead core (not shown) of a third inner diameter different from the first and second inner diameters.

The above describes in detail a particularly preferred embodiment of the present invention, but the present invention is not limited to the illustrated embodiment and can be modified and implemented in various ways.

[Additional Notes]
The present invention includes the following aspects.

[Invention 1]
A green tire building apparatus comprising:
A substantially cylindrical deck portion for winding the carcass ply in a cylindrical shape;
a pair of bead lock portions for supporting a pair of bead cores that are outer-layered on the cylindrical carcass ply;
an outer diameter regulating portion for regulating an outer diameter of the deck portion,
The deck section includes a plurality of deck segments arranged in a circumferential direction so as to form a substantially cylindrical outer circumferential surface, and a deck drive section for expanding and contracting the deck segments.
The pair of bead lock portions include a plurality of lock segments arranged in a circumferential direction, and a bead lock drive portion for pressing and supporting the bead core from the radially inner side via the carcass ply by expanding the diameter of the lock segments,
the lock segment is movable at least between a first diameter expansion position for supporting a bead core having a first inner diameter and a second diameter expansion position for supporting a bead core having a second inner diameter smaller than the first inner diameter,
the outer diameter regulating portion regulates the deck segment to a first outer diameter when the lock segment is in the first diameter expansion position, and regulates the deck segment to a second outer diameter smaller than the first outer diameter when the lock segment is in the second diameter expansion position.
Green tire building equipment.
[Invention 2]
The outer diameter regulating portion is
A first protrusion protruding from the deck segment toward the lock segment;
a second protrusion provided on the deck segment side of the lock segment and in contact with the radially outer side of the first protrusion.
[The present invention 3]
The bead lock drive unit includes a plurality of lock guides that are arranged in a circumferential direction to support the plurality of lock segments so as to be expandable in diameter and are movable in a radial direction,
The deck driving unit includes a plurality of deck guides that are arranged in a circumferential direction so as to support the plurality of deck segments in a radially expandable manner and are movable in a radial direction,
The green tire building apparatus according to claim 2, wherein the lock guide and the deck guide do not face each other in the circumferential direction.
[Invention 4]
The green tire building apparatus according to claim 3, wherein the first protrusion is provided on the deck guide.
[Invention 5]
5. The green tire building apparatus according to any one of claims 1 to 4, wherein the difference between the first inner diameter and the second inner diameter is 1 inch.
[Invention 6]
A tire manufactured using a green tire built using the green tire building apparatus according to any one of claims 1 to 5 of the present invention.

REFERENCE SIGNS LIST 1 green tire building device 12 deck section 13 bead lock section 15 outer diameter regulating section 25 deck segment Bc bead core 30 lock segment Q1 first outer diameter P1 first diameter expansion position Q2 second outer diameter P2 second diameter expansion position

Claims (6)

A green tire building apparatus comprising:
A substantially cylindrical deck portion for winding the carcass ply in a cylindrical shape;
a pair of bead lock portions for supporting a pair of bead cores that are outer-layered on the cylindrical carcass ply;
an outer diameter regulating portion for regulating an outer diameter of the deck portion,
The deck section includes a plurality of deck segments arranged in a circumferential direction so as to form a substantially cylindrical outer circumferential surface, and a deck drive section for expanding and contracting the deck segments.
The pair of bead lock portions include a plurality of lock segments arranged in a circumferential direction, and a bead lock drive portion for pressing and supporting the bead core from the radially inner side via the carcass ply by expanding the diameter of the lock segments,
the lock segment is movable at least between a first diameter expansion position for supporting a bead core having a first inner diameter and a second diameter expansion position for supporting a bead core having a second inner diameter smaller than the first inner diameter,
the outer diameter regulating portion regulates the deck segment to a first outer diameter when the lock segment is in the first diameter expansion position, and regulates the deck segment to a second outer diameter smaller than the first outer diameter when the lock segment is in the second diameter expansion position.
Green tire building equipment. The outer diameter regulating portion is
A first protrusion protruding from the deck segment toward the lock segment;
2. The green tire building apparatus according to claim 1, further comprising: a second protrusion provided on the deck segment side of the lock segment and in contact with a radially outer side of the first protrusion. The bead lock drive unit includes a plurality of lock guides that are arranged in a circumferential direction to support the plurality of lock segments so as to be expandable in diameter and are movable in a radial direction,
The deck driving unit includes a plurality of deck guides that are arranged in a circumferential direction so as to support the plurality of deck segments in a radially expandable manner and are movable in a radial direction,
The green tire building apparatus according to claim 2 , wherein the lock guide and the deck guide do not face each other in the circumferential direction. The green tire building device according to claim 3, wherein the first protrusion is provided on the deck guide. The green tire building device according to any one of claims 1 to 4, wherein the difference between the first inner diameter and the second inner diameter is 1 inch. A tire manufactured using a green tire molded using the green tire molding device described in any one of claims 1 to 5.

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