JP2003071945A - Tire for two-wheeled vehicle and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tire for a two-wheeled vehicle wherein a uniformity is prevented from being deteriorated and unevenness of a density of driving of belt cords is prevented from occurring, and to provide a method for manufacturing the same. SOLUTION: The method for manufacturing the tire 10 for the two-wheeled vehicle comprises the steps of forming a belt layer 16, then winding an elastic strip-like member 46 at a radial outside of the tire of the layer 16 spirally in a circumferential direction of the tire so as to at least partly laminate the member 46 in a step of forming a tire profile, and forming a tread 22 and a sidewall 26 by suitably changing a laminated amount of the member 46. Thus, the uniformity can be prevented from being deteriorated by increasing the laminating amount of the member 46 at a position which relatively needs a rigidity and decreasing the laminating amount at a position which does not relatively need the rigidity.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pneumatic tire, and more particularly, to a two-wheel tire and a manufacturing method thereof for preventing deterioration of uniformity and occurrence of unevenness in driving density of belt cords.

[0002]

2. Description of the Related Art Conventionally, a tread portion of a two-wheel tire (hereinafter referred to as "MC tire") is formed by winding a tread member extruded by an extruder as it is in the tire circumferential direction.

However, MC tires having a relatively large curvature have a problem that wrinkles occur on the shoulder side of the tire and uniformity (uniformity of rigidity) deteriorates.

Further, in the conventional MC tire manufacturing method,
Since the tire is pressed against the mold with a so-called plader from the inside of the tire to vulcanize it, the position of the belt inside the tread before molding and the position of the belt after molding do not always have the same diameter with high accuracy. There is a certainty. If the accuracy is not high, there is a problem that the cord position of the belt moves in the tire width direction and the driving density of the belt cord layer varies.

[0005]

In view of the above facts, the present invention prevents the deterioration of uniformity and drives the belt cord layer by spirally winding the belt in the circumferential direction of the tire. An object of the present invention is to provide a two-wheel tire capable of preventing the occurrence of density variations and a method for manufacturing the same.

[0006]

In the method for manufacturing a two-wheel tire according to claim 1, a pair of carcass layer locking members,
A carcass layer straddling between the carcass layer locking members, and a belt layer arranged on the tire radial outside of the carcass layer,
A tread rubber layer arranged on the tire radial direction outer side of the belt layer, and a bead portion mainly composed of the carcass layer locking member, and a tread portion mainly composed of the tread rubber layer. A method for manufacturing a tire for two wheels, comprising: a sidewall portion located between the bead portion and the tread portion, the method comprising:
A carcass layer forming step of forming a carcass layer by providing a carcass belt-shaped member that bundles one or a plurality of cords;
A layer member provided with a cord on the outside of the carcass layer in the tire radial direction, in which one or a plurality of cords are bundled and a belt strip-shaped member is spirally wound in the tire circumferential direction or is inclined with respect to the tire circumferential direction. And a belt layer forming step of forming the belt layer by winding, on the tire radial direction outer side of the belt layer, an elastic band-shaped member is wound so as to be spirally and at least partially laminated in the tire circumferential direction, And a step of forming the tread portion and the sidewall portion by appropriately changing the stacking amount of the elastic belt-shaped members.

Next, the function and effect of the method for manufacturing a two-wheel tire according to claim 1 will be described.

According to the method for manufacturing a two-wheel tire of the present invention, in the carcass layer forming step, a carcass belt-shaped member in which one or a plurality of cords are bundled is provided on a core that can be divided into a plurality of carcass. A layer is formed.

After the carcass layer is formed, in the belt layer forming step, 1 is provided on the outer side of the carcass layer in the radial direction of the tire.
The belt layer is formed by spirally winding a belt-shaped member formed by bundling a plurality of cords or a plurality of cords in the tire circumferential direction, or by winding a layer member having cords inclined with respect to the tire circumferential direction. .

After the belt layer is formed, in the tire outer shell forming step, an elastic band member is spirally wound in the tire circumferential direction on the outer side of the belt layer in the tire radial direction so that at least a part of the elastic band member is laminated to form an elastic member. The tread portion and the sidewall portion are formed by appropriately changing the stacking amount of the belt-shaped members.

A raw tire is manufactured through the above steps,
A two-wheel tire is manufactured by vulcanizing this in a vulcanization process.

According to the method for manufacturing a two-wheel tire of the present invention, in the tire outer shell forming step, the tread portion and the sidewall portion are elastic belt-like members spirally laminated in the tire circumferential direction and at least a part thereof is appropriately laminated. It is formed by winding.

Therefore, it is possible to prevent the uniformity from deteriorating by increasing the amount of lamination of the elastic strip-shaped members in a portion where the rigidity is relatively required and decreasing the amount of lamination in a portion where the rigidity is relatively unnecessary.

In the case where the tread portion is formed by the tread rubber extruded by the extruder as in the conventional case, when the thickness of the tread rubber is changed, the shape of the extrusion port called the die of the extruder is changed. It is necessary to process the shape of the mouthpiece, but in the present invention, since the thickness of the tread portion can be adjusted by appropriately changing the laminating amount of the elastic band-shaped member, it is troublesome to process the mouthpiece. Can be omitted.

Further, as in the conventional case, when one plate-shaped tread rubber is wound to form the tread portion, it is necessary to finally bond both ends (cut ends) of the tread rubber. If a large unexpected force is applied to the surface (splice surface), it may come off.

Particularly, in a tire having a large tangential force / ground contact area ratio, such as an MC tire, a phenomenon called open splice (a phenomenon in which a joint portion (connection portion) of a tread rubber is peeled off by a tangential force in the tire circumferential direction) frequently occurs. It was a problem.

However, according to the present invention, since the elastic strip member is spirally wound in the tire circumferential direction so that at least a part thereof is laminated, the area of the splice surface can be reduced. Therefore, the open splice that crosses the tread cross section can be significantly reduced.

Further, in a tire having a large tread curvature such as an MC tire, the peripheral lengths of the center portion (large peripheral length) and the shoulder portion (small peripheral length) of the tire are extremely different from each other. In the manufacturing method, it is necessary to narrow down the tread rubber toward the shoulder portion. In the process of narrowing down, so-called "waviness" occurs in the tread rubber of the shoulder portion, which has a problem of having a great adverse effect on variations in gauge distribution.

However, in the present invention, since it is not necessary to narrow the tread rubber toward the shoulder portion, so-called "waviness" does not occur in the tread rubber of the shoulder portion. Therefore, variations in gauge distribution in the tread portion are not affected.

In the method for manufacturing a two-wheel tire according to claim 2, vulcanization is performed by vulcanizing the raw tire manufactured by the method for manufacturing a two-wheel tire according to claim 1 with the core attached. It is characterized by including steps.

Next, the function and effect of the method for manufacturing a two-wheel tire according to claim 2 will be described.

In the vulcanization step, vulcanization is performed with the core attached to the green tire manufactured by the method for manufacturing a two-wheel tire according to claim 1. After vulcanization, the core is divided and removed.

In the conventional manufacturing method, the core is not used and the inside of the green tire is vulcanized by using the plader which expands during vulcanization. Therefore, the belt diameter is not always the same before and after vulcanization, and the belt layer moves in the tread portion of the tire to a position where the diameter is optimum, and there is a problem that the driving density of the belt cord varies. .

Therefore, in the present invention, in the vulcanization step,
Since vulcanization is performed with the core attached to the green tire, movement of the belt layer can be prevented, and variation in the driving density of the belt cord can be prevented.

In the method for manufacturing a two-wheel tire according to claim 3, the core is divided and removed from the raw tire manufactured by the method for manufacturing a two-wheel tire according to claim 1, and the inside of the raw tire is divided. The method is characterized by including a vulcanization step of vulcanizing using a vulcanization plader that expands during vulcanization.

Next, the function and effect of the method for manufacturing a two-wheel tire according to claim 3 will be described.

In the vulcanization step, the core is divided and removed from the green tire manufactured by the method for manufacturing a two-wheel tire according to claim 1, and a vulcanization plader that expands during vulcanization is provided inside the green tire. It may be used and vulcanized.

In the method for manufacturing a two-wheel tire according to claim 4, the carcass layer locking member for crimping the spirally wound carcass layer locking member onto the core before forming the carcass layer. It is characterized by including a crimping process.

Next, the function and effect of the method for manufacturing a two-wheel tire according to claim 4 will be described.

Before forming the carcass layer, in the carcass layer locking member crimping step, it is preferable to crimp the spirally wound carcass layer locking member to the core.

In the method for manufacturing a two-wheel tire according to claim 5, after the formation of the carcass layer, the carcass layer locking member wound in a spiral shape is pressure-bonded to the carcass layer outside in the tire width direction. The carcass layer locking member crimping step is included.

Next, the function and effect of the method for manufacturing a two-wheel tire according to claim 5 will be described.

After forming the carcass layer, in the carcass layer locking member crimping step, it is preferable to crimp the spirally wound carcass layer locking member to the outer side in the tire width direction of the carcass layer.

According to the present invention, in particular, both sides of the carcass layer can be sandwiched by the carcass layer locking members, the carcass layer can be locked more reliably, and the strength (rigidity) of the tire can be increased. You can

In the method for manufacturing a two-wheel tire according to claim 6, in the tire outer shell forming step, the elastic strip-shaped member at the position where the circumferential groove formed on the surface of the tread portion in the vulcanizing step is formed. It is characterized in that it is wound so that the amount of lamination becomes small.

Next, the function and effect of the method for manufacturing a two-wheel tire according to claim 6 will be described.

In the tire shell forming step, the elastic band-shaped member is wound so that the amount of lamination of the elastic belt-shaped members at the positions where the circumferential grooves are formed on the surface of the tread portion in the vulcanization step is reduced.

That is, in the vulcanizing step, the raw tire is vulcanized by a vulcanizing mold having a convex portion provided inside. A circumferential groove is formed at a position corresponding to this convex portion.

Here, if the thickness of the tread rubber layer at the position corresponding to the convex portion of the vulcanizing mold is large, the tread rubber layer is pushed away by the convex portion during vulcanization, and the tread rubber layer flows. At this time, the belt layer arranged inside the flowing tread rubber layer in the tire radial direction moves by being dragged by the flow of the tread rubber layer, and the uniform cord arrangement of the belt layer is disturbed. As a result, there is a problem that the belt rigidity distribution becomes nonuniform, the uniformity deteriorates, and the steering stability decreases.

Therefore, as in the present invention, by winding the elastic strip-shaped member at the position where the circumferential groove is formed so as to reduce the amount of lamination, the belt layer is dragged by the flow of the elastic strip-shaped member which is the tread rubber layer. It is possible to prevent it from moving as much as possible. Therefore, it is possible to prevent the uniform cord arrangement of the belt layer from being disturbed and prevent the belt rigidity distribution from becoming nonuniform. As a result, it is possible to prevent the deterioration of uniformity and prevent the deterioration of steering stability.

At the position where the circumferential groove is formed, the adjacent elastic band-shaped members are abutted with each other without laminating the adjacent elastic band-shaped members, or the adjacent elastic band-shaped members are spaced from each other by providing an elastic band-shaped member. The member may be spirally wound in the tire circumferential direction.

A two-wheel tire according to a seventh aspect is characterized by being manufactured by the method for manufacturing a two-wheel tire according to any one of the first to sixth aspects.

Next, the function and effect of the two-wheel tire according to claim 7 will be described.

2 according to any one of claims 1 to 6
According to the two-wheel tire manufactured by the method for manufacturing a tire for a wheel, it is possible to prevent the uniformity from being deteriorated and to prevent the density of driving the belt cords from being varied.

[0045]

BEST MODE FOR CARRYING OUT THE INVENTION A two-wheel tire according to a first embodiment of the present invention will be described below with reference to the accompanying drawings.

First, a schematic structure of a two-wheel tire will be described.

As shown in FIG. 1, the two-wheel tire 10 (hereinafter, appropriately referred to as “MC tire 10”) includes a pair of left and right carcass layer locking members 51. The carcass layer locking member 51 includes an inner locking member 52 and an outer locking member 54, and the carcass layer 14 has the inner locking member 52.
It has a so-called sandwich structure sandwiched between the outer locking member 54 and the outer locking member 54. Two belt layers 16 are arranged outside the carcass layer 14 in the tire radial direction. A tread rubber layer 18 is arranged on the outer side of the belt layer 16 in the tire radial direction.

As described above, in the two-wheel tire 10, the bead portion 20 mainly composed of the carcass layer locking member 51, the tread portion 22 mainly composed of the tread rubber layer 18, and the tire width of the tread portion 22. A shoulder portion 24 located at the end in the direction and a sidewall portion 26 located between the shoulder portion 24 and the bead portion 20 are provided.

Next, a method for manufacturing the two-wheel tire of the present invention will be described.

First, the principal part of the manufacturing apparatus used for attaching the ply sheet 14A constituting the carcass layer 14 will be described.

As shown in FIG. 2, the manufacturing apparatus 30 includes a core 32 to which the ply sheet 14A is attached, a rotary shaft 34 for supporting the core 32, an inner liner (not shown) and a ply for the core 32. And a sticking mechanism 36 for sticking the sheet 14A.

The core 32 is formed to have an inflated carcass shape by attaching the inner liner and the ply sheet 14A along the outline (direction orthogonal to the tire circumferential direction) in the axial cross section. Has been done.

The ply sheet 14 will be described later.
After the belt layer 16 and the like are attached to A to form the raw tire, the core 32 is divided and configured to be removable from the inside of the two-wheel tire 10.

The sticking mechanism 30 includes a supply unit (not shown) on which the belt-shaped ply sheet 14A is stocked, and a sticking unit 40 for sticking the ply sheet 14A pulled out from the supply unit to the core 32. .

The ply sheet 14A is a rectangular narrow ribbon strip in which one or a plurality of carcass cords are bundled substantially parallel to each other and coated with rubber.

The attaching portion 40 has a ply sheet 14A inside.
An arm 41 that conveys the ply sheet 14A and an oscillating portion 42 that is configured to be rotatable around a rotation shaft 44 provided at the tip of the arm 41, and the ply sheet 14A is attached to the core 32 from the tip. Is.

A manufacturing method for manufacturing the two-wheel tire 10 (MC tire 10, green tire) using the manufacturing apparatus 30 configured as described above will be described.

First, before the carcass layer forming step, in the carcass layer locking member crimping step, the inner locking member 52 spirally wound is crimped onto the core 32.

Next, in the carcass layer forming step, the rectangular ply sheet 14A is supplied from the supply portion and attached to the core 32 to which the inner liner has already been attached, from above the inner liner.

At this time, the core 32 is rotationally moved in the tire circumferential direction (direction Y in FIG. 2) by a drive mechanism (not shown), and the swinging part 42 of the sticking mechanism 36 is widthwise (direction X in FIG. 2). ) Is rotated about the rotation shaft 44.

That is, as the oscillating portion 42 rotates, the ply sheet 14 moves from one widthwise end of the core 32 to the ply sheet 14.
A is sequentially attached, and when the ply sheet 14A reaches the other widthwise end of the core 32, the arm 41 is expanded and contracted to rotate the swinging part 42 in the opposite direction, and the core 32 is again attached. The ply sheet 14A is attached to the one end in the width direction. At this time, the ply sheet 14A is cut by the cutting device (not shown) at the widthwise end of the core 32.

As described above, the ply sheet 14A is used as the core 3
When reaching the widthwise end of No. 2, the ply sheet 14A is cut, and another ply sheet 14A is attached toward the other widthwise end of the core 32. This sticking operation is continued until the rotary shaft 34 makes one round, and finally the ply sheet 14A is stuck on the circumference of the core 32.

As described above, the ply sheet 14A is attached on the periphery of the core 32 to form the carcass layer 14.

Then, in the carcass layer locking member crimping step again, the spirally wound outer locking member 54 is crimped to the outside of the carcass layer 14 in the tire width direction.

The inner locking member 52 and the outer locking member 54 may be spirally wound in advance and may be crimped, or linear ones may be spirally wound and crimped. .

Next, in the belt layer forming step, a narrow ribbon-shaped strip (belt belt-shaped member) obtained by bundling one or a plurality of non-stretchable cords in parallel with each other and coating them with rubber is applied from above the carcass layer 14. It is spirally wound in the circumferential direction. Thus, the belt layer 16 is formed by spirally winding the narrow ribbon strip.

In particular, in this embodiment, the belt layer 16 has two layers.
Wrap a small ribbon strip in layers.

In addition to spirally winding the narrow ribbon strip, two layer members (not shown) may be wound around the carcass layer 14.

Next, in the tire contour forming step, the tread portion 22, the shoulder portion 24 and the sidewall portion 26 are formed by using another manufacturing apparatus (not shown).

That is, a small width rubber strip ribbon strip 46 (elastic band member), which is a tread rubber, is wound around the belt layer 16 in the tire radial direction in a spiral manner in the tire circumferential direction so that at least a part thereof is laminated. To go.

In particular, in this embodiment, the stacking amount of the small rubber strip ribbon strip 46 is changed so that the tread portion 22 and the shoulder portion 24 have three layers and the sidewall portion 26 has four layers. Winding around.

A raw tire is manufactured through the above steps,
The two-wheel tire 10 is manufactured by vulcanizing the green tire in the vulcanization step with the core 32 attached.
After the vulcanization, the core 32 is divided and removed.

According to the present invention, in the step of forming the outer shell of the tire, the tread portion 22 and the sidewall portion 26 are formed so that the small width rubber strip ribbon strips 46 are spirally laminated in the tire circumferential direction and at least a part thereof is appropriately laminated. Since it is formed by winding, the laminating amount of the small width rubber strip ribbon strips 46 is increased in a place where the rigidity is relatively required, and the laminating amount of the small width rubber strip ribbon strips 46 is decreased in a place where the rigidity is relatively unnecessary. can do. As a result, it is possible to prevent the uniformity from deteriorating.

Further, in the present invention, the thickness of the tread portion 22 can be adjusted by appropriately changing the stacking amount of the small width rubber strip ribbon strips 46, and the conventional processing of the die can be omitted. .

Further, in the present invention, the small width rubber strip ribbon strip 46 is wound in the tire circumferential direction in a spiral shape so that at least a part thereof is laminated, so that the area of the splice surface can be reduced. Therefore, the open splice that crosses the tread cross section can be significantly reduced.

Further, in the present invention, since it is not necessary to narrow the tread rubber layer 18 toward the shoulder portion 24,
The tread rubber layer 18 of the shoulder portion 24 has a so-called "
There will be no waviness. Therefore, the tread portion 2
It does not affect the variation of the gauge distribution of No. 2.

Further, in the present invention, in the vulcanization step,
To vulcanize the green tire with the core 32 attached,
It is possible to prevent the movement of the belt layer 16 and prevent variations in the driving density of the belt cord.

Next, a two-wheel tire according to the second embodiment of the present invention will be described.

The two-wheel tire 1 according to the first embodiment.
The same components as those in 0 are denoted by the same reference numerals, and the description of the overlapping processes in the configuration of the two-wheel tire and the manufacturing method thereof will be appropriately omitted.

As shown in FIG. 3, in the two-wheel tire 50 of the present embodiment, by increasing the amount of the small rubber strip ribbon strip 46 laminated from the tread portion 22 to the shoulder portion 24 and the sidewall portion 26. The rubber thickness is increased.

According to the two-wheel tire 50 of this embodiment,
Since the rigidity in the vicinity of the shoulder portion 24 can be increased, the strength against the cornering force can be improved.

Further, by increasing the laminating amount of the small width rubber strip ribbon strip 46 in the shoulder portion 24 and increasing the rigidity in the vicinity of the shoulder portion 24, at the same time, the laminating amount of the small width rubber strip ribbon strip 46 in the central region in the tire width direction is increased. By suppressing the increase and making the thickness relatively thin, the increase in the weight of the entire two-wheel tire 50 can be suppressed as much as possible.

Next, a two-wheel tire according to the third embodiment of the present invention will be described.

The same components as those of the two-wheel tire 50 of the second embodiment are designated by the same reference numerals, and the description of the overlapping steps in the two-wheel tire configuration and its manufacturing method will be appropriately omitted.

As shown in FIG. 4, in the two-wheel tire 70 of this embodiment, as compared with the two-wheel tire 50 of the second embodiment, the position where the circumferential groove 72 is formed, that is, the vulcanization step. A small rubber strip ribbon strip 4 at a position where it comes into contact with a convex portion (not shown) formed inside the mold not shown in FIG.
It is formed so that the stacking amount of 6 is small.

Next, a method for manufacturing the two-wheel tire of this embodiment will be described.

In the method for manufacturing the two-wheeled tire 70 of this embodiment, the carcass layer locking member crimping step, the carcass layer forming step and the belt layer forming step are performed in the same manner as the manufacturing method described in the second embodiment. .

Next, in the tire contour forming step, the small width rubber strip ribbon strips 46 are wound so that the laminated amount of the small width rubber strip ribbons 46 at the position where the circumferential groove 72 is formed is reduced. Go.

In particular, in this embodiment, the small width rubber strip ribbon strip 46 is formed at a position where the circumferential groove 72 is formed.
Layer, and other part of narrow rubber strip ribbon strip 46
Is at least 5 layers.

Thereafter, the green tire is vulcanized in the vulcanization process to manufacture the two-wheel tire 70.

According to the two-wheel tire 70 of this embodiment,
By winding the small width rubber strip ribbon strip 46 at the position where the circumferential groove 72 is formed so as to reduce the amount of lamination,
It is possible to prevent the belt layer 16 from being dragged and moved due to the flow of the small rubber strip ribbon strip 46 due to the convex portion of the mold.

Therefore, it is possible to prevent the uniform cord arrangement of the belt layer 16 from being disturbed and prevent the belt rigidity distribution from becoming nonuniform. As a result, it is possible to prevent the deterioration of uniformity and prevent the deterioration of steering stability.

Next, a two-wheel tire according to the fourth embodiment of the present invention will be described.

The same components as those of the two-wheel tire of the first embodiment are designated by the same reference numerals, and the description of the overlapping steps in the two-wheel tire configuration and the manufacturing method thereof will be appropriately omitted.

As shown in FIG. 5, in the two-wheel tire 90 of the present embodiment, as compared with the two-wheel tire 70 of the third embodiment, the small width rubber strip ribbon is formed at the position where the circumferential groove 92 is formed. The strip 46 is not wound.

That is, the two-wheel tire 90 of this embodiment.
Then, the small width rubber strip ribbon strips 46 are wound with a space provided between adjacent small width rubber strip ribbon strips 46,
The intervals are formed at the positions where the circumferential grooves 92 are formed.

Also in the two-wheel tire 90 of the present embodiment, like the two-wheel tire 70 of the third embodiment, the uniform cord arrangement of the belt layer 16 is prevented from being disturbed and the belt rigidity distribution is minimized. Can be prevented as much as possible. As a result, it is possible to prevent deterioration of uniformity as much as possible and prevent deterioration of steering stability as much as possible.

[0098]

As described above, according to the present invention, it is possible to prevent the uniformity from being deteriorated and to prevent the variation in the driving density of the belt cord layer.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a two-wheel tire according to a first embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a manufacturing apparatus for forming a carcass layer that constitutes the two-wheel tire of the present invention.

FIG. 3 is a partial cross-sectional view of a two-wheel tire according to a second embodiment of the present invention.

FIG. 4 is a partial cross-sectional view of a two-wheel tire according to a third embodiment of the present invention.

FIG. 5 is a partial cross-sectional view of a two-wheel tire according to a fourth embodiment of the present invention.

[Explanation of symbols]

10, 50, 70, 90 Two-wheel tire 14 Carcass layer 14A Ply sheet (carcass belt-shaped member) 16 Belt layer 20 Bead portion 22 Tread portion 26 Sidewall portion 32 Core 46 Small rubber strip ribbon strip (elastic belt-shaped member) 51 Carcass layer locking members 72, 92 Circumferential groove

Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B60C 15/00 B60C 15/00 D

Claims (7)

[Claims] 1. A pair of carcass layer locking members, a carcass layer extending between the carcass layer locking members, a belt layer arranged outside the carcass layer in the tire radial direction, and a tire diameter of the belt layer. A tread rubber layer arranged outside in the direction, and a bead portion mainly composed of the carcass layer locking member, a tread portion mainly composed of the tread rubber layer, the bead portion and the A method for manufacturing a tire for two wheels, comprising: a sidewall portion located between tread portions; and a carcass belt-shaped member in which one or a plurality of cords are bundled on a core that can be divided into a plurality of pieces. And a carcass layer forming step of forming the carcass layer, and a belt strip-shaped member in which one or a plurality of cords are bundled is spirally wound in the tire circumferential direction on the outside of the carcass layer in the tire radial direction. Shishi A belt layer forming step of forming a belt layer by winding a layer member provided with a cord inclined with respect to a tire circumferential direction; and an elastic strip-shaped member spirally arranged in a tire circumferential direction on a tire radial direction outer side of the belt layer. And at least a part of the elastic band-shaped member is laminated so as to be laminated, and the tread portion and the sidewall portion are formed by appropriately changing the lamination amount of the elastic band-shaped member. Wheel tire manufacturing method. 2. A vulcanization step of vulcanizing the green tire manufactured by the method for manufacturing a two-wheel tire according to claim 1 with the core attached to the green tire. A method for manufacturing the two-wheel tire described above. 3. The core is divided and removed from the green tire manufactured by the method for manufacturing a two-wheel tire according to claim 1, and the core is vulcanized inside the green tire using a vulcanizing plader that expands during vulcanization. The method for producing a two-wheel tire according to claim 1, further comprising a vulcanization step of vulcanizing. 4. A carcass layer locking member crimping step of crimping the spirally wound carcass layer locking member to the core before forming the carcass layer. 4. The method for manufacturing a two-wheel tire according to any one of items 1 to 3. 5. A carcass layer locking member crimping step of crimping the spirally wound carcass layer locking member to the outer side in the tire width direction of the carcass layer after the formation of the carcass layer. The method for manufacturing a two-wheel tire according to any one of claims 1 to 4. 6. The tire outer shape forming step is characterized in that winding is performed such that a stacking amount of the elastic strip-shaped member at a position where a circumferential groove formed on the surface of the tread portion in the vulcanizing step is reduced. The method for manufacturing a two-wheel tire according to any one of claims 2 to 5. 7. A two-wheeled tire manufactured by the method for manufacturing a two-wheeled tire according to any one of claims 1 to 6.