JP2008254338A - Method and apparatus for manufacturing tire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stably provide a sound material-containing tire of high quality by providing a method for uniformly and precisely fixing a sound absorbing material in a tire peripheral direction under high productivity and an apparatus therefor in attaching the sound absorbing material to the inner peripheral surface of the tire's tread part. <P>SOLUTION: The sound absorbing material is folded into such a size as to pass its maximum diameter through a rim hole to be inserted into the tire from the rim hole. Subsequently, the folded sound absorbing material is expanded in the tire to be brought into contact with the inner peripheral surface of the tread part and fixed to the inner peripheral surface of the tread part through an adhesive. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a tire manufacturing method and apparatus for reducing cavity resonance generated by vibration of filled air in a tire chamber.

  A pneumatic tire mounted on a vehicle has an internal shape or the like due to vibration of the tire tread portion caused by unevenness of the road surface and vibration of the filled air in the tire while the vehicle is running. The resulting cavity resonance results in noise called road noise in the car cabin.

  In order to avoid such road noise, Patent Document 1 discloses a tire formed by a rim and a pneumatic tire bonded to the rim in order to enhance the suppression effect of cavity resonance and greatly reduce road noise. A non-ring-shaped sound absorbing material using a sponge material is fixed to the inner cavity in the tire circumferential direction, and the sound absorbing material has a ratio S2 / S1 of the volume S2 to the total area S1 of the tire inner cavity of 0. 4% or more, and the sound absorbing material has a specific gravity of 0.005 to 0.06, and the surface of the sound absorbing material facing the tire cavity is an uneven surface, and the uneven surface is a protruding convex portion. There has been proposed an assembly of a pneumatic tire and a rim, in which recesses and recesses are scattered in the tire circumferential direction or the tire axial direction without being aligned and the irregularities are repeated.

  Further, Patent Documents 2 and 3 propose a tire having a sound absorbing material for reducing noise accompanying cavity resonance generated in the tire chamber.

  The tire with the sound absorbing material is usually provided with a sound absorbing material attached to the inner peripheral surface of the tread portion of the product tire. In the above-mentioned Patent Documents 2 and 3, the sound absorbing material having a shape that gives rigidity ( A method is disclosed in which a sponge or the like is manually inserted and then fixed by the restoring force of the sound absorbing material itself.

Patent Document 4 proposes a method in which a narrow-width member (sponge material) is attached in a spiral shape inside a rotating tire while applying an adhesive.
Japanese Patent No. 3622957 JP 2004-276809 A JP 2004-291855 A JP 2002-347418A

  When the sound absorbing material is attached to the inner peripheral surface of the tread portion of the tire, it is preferable to apply the integrally formed sound absorbing material along the inner peripheral surface of the tire at a time. However, in the examples of Patent Documents 2 and 3, when attaching a ring-shaped sound absorbing material having a large width so that sufficient characteristics can be obtained in one round on the inner peripheral surface of the tire, the diameter of the sound absorbing material is reduced, and then expanded. The work of diameter pasting is done manually. Therefore, this work takes time, so the productivity is low.Furthermore, it is difficult to arrange the sound-absorbing material uniformly and accurately in the tire circumferential direction and fix and adhere to it, and the quality is uneven. there were.

  In addition, in the example of Patent Document 4, a method of sticking a sound absorbing material having a narrow width in a spiral shape is proposed. However, in this method, the sound absorbing material is stretched more than necessary, and therefore, a sound absorbing material designed in advance is used. There arises a problem that the characteristics cannot be obtained and the film is easily peeled off. Further, when the sound absorbing material is spirally wound, a gap is generated between adjacent sound absorbing materials, and the sound absorbing effect may vary.

  Therefore, the object of the present invention is to solve the above-described problems, and to attach the sound absorbing material to the inner peripheral surface of the tread portion of the tire, the sound absorbing material is uniform and accurate in the tire circumferential direction, and under high productivity, By providing a fixing method and an apparatus therefor, it is to stably provide a high-quality sound-absorbing tire.

The gist of the present invention is as follows.
(1) When attaching the band-shaped sound absorbing material to at least the inner peripheral surface of the tread portion of the tire,
Folding the sound absorbing material into a size that allows the maximum diameter of the sound absorbing material to pass through the rim hole, and inserting it into the tire from the rim hole,
Next, in the tire, the folded sound absorbing material is expanded and brought into contact with the inner peripheral surface of the tread portion, and the sound absorbing material is fixed to the inner peripheral surface of the tread portion with an adhesive.
“Folding the sound absorbing material so that the maximum diameter of the sound absorbing material can pass through the rim hole” means, of course, that the maximum diameter of the folded sound absorbing material is not larger than the rim diameter. Even when the diameter is equal to or larger than the rim diameter, when the folded sound absorbing material passes through the rim hole, for example, the sound absorbing material is compressed by contact with the edge of the rim hole, and the sound absorbing material is in contact with the edge of the rim hole. This includes the case where the maximum diameter of the material is not more than the rim diameter and passes through the rim hole.
Further, “expanding the folded sound absorbing material and bringing it into contact with the inner peripheral surface of the tread portion” includes not only the case where the sound absorbing material is brought into contact with the inner peripheral surface of the tread portion but also the case where the sound absorbing material is pressed against the inner peripheral surface of the tread portion.
Furthermore, the rim hole is a hole for inserting and attaching the wheel into the tire.

(2) The belt-shaped sound absorbing material is partially converged from the annularly expanded state toward the inner side in the radial direction of the ring so that the maximum diameter of the sound absorbing material can be folded through the rim hole, and the folded shape The sound absorbing material is inserted into the tire through the rim hole, and then the fold-shaped sound absorbing material is expanded again into the annular shape inside the tire and brought into contact with the inner peripheral surface of the tread portion. A tire manufacturing method, comprising fixing the sound absorbing material to a surface.

(3) A belt-shaped sound absorbing material is wound around at least three inscribed shafts arranged at equal positions on the same circumference, and at least between the inscribed shafts on the circumference and outside the sound absorbing material. Place three circumscribed shafts,
The inscribed shaft is moved inward in the radial direction of the sound absorbing material to a position aligned on a small circumference having a diameter less than the tire rim diameter, and the inscribed shaft is directed inward in the radial direction of the sound absorbing material. By moving to the inside of
Folding the contact area of the sound-absorbing material with the circumscribed shaft radially inward, and making the maximum diameter of the sound-absorbing material large enough to pass through the rim hole, the sound-absorbing material is inserted into the tire from the rim hole of the tire,
Next, after removing the circumscribed shaft from the sound absorbing material,
The inscribed shaft is moved toward a radially outer side of the sound absorbing material, the sound absorbing material is brought into contact with the inner peripheral surface of the tread portion, and the sound absorbing material is fixed to the inner peripheral surface of the tread portion through an adhesive. Tire manufacturing method.

(4) The tire manufacturing method according to any one of (1) to (3), wherein the tire is a product tire after vulcanization molding.

(5) The tire manufacturing method according to any one of (1) to (3) above, wherein the tire is a green tire before vulcanization molding.

(6) A sound-absorbing material holder provided such that at least three inscribed shafts arranged on the same circumference can be reduced and moved in a radial direction to a small circumference having a diameter smaller than the tire rim diameter;
An apparatus for manufacturing a tire, comprising a combination of a sound absorbing material reducing tool provided with at least three circumscribed shafts arranged on the same circumference so as to be movable to an inner region of the small circumference.

(7) In the above (6), when the inscribed shaft is disposed at a position where the sound absorbing material can contact the inner peripheral surface of the tread portion, the inscribed shaft can press the sound absorbing material against the inner peripheral surface of the tread portion. A tire manufacturing apparatus.
Note that “the inscribed shaft is disposed at a position where the sound absorbing material can contact the inner circumferential surface of the tread portion” means that the outer diameter of the inscribed shaft disposed on the same circumference is the diameter of the inner circumferential surface of the tread portion. Even if the outer diameter of the inscribed shaft is smaller than the diameter of the inner circumferential surface of the tread portion, the outer diameter of the sound absorbing material is the inner circumferential surface of the tread portion when the sound absorbing material is wound around the outer side of the inner shaft. The case where the diameter is equal to or greater than or equal to the diameter is included.

(8) In the tire according to (7), the inscribed shaft can be pressed against the inner circumferential surface of the tread portion by rotating about the central axis of the inscribed shaft as a rotation axis. Manufacturing equipment.

(9) The tire manufacturing apparatus according to (7), wherein the tire can be pressed against the inner circumferential surface of the tread portion by rotating the tire about the central axis of the tire.

(10) The tire manufacturing apparatus according to (9), wherein the tire is a product tire after vulcanization molding.

(11) The tire manufacturing apparatus according to (9), wherein the tire is a green tire before vulcanization molding.

(12) The tire manufacturing apparatus according to any one of (6) to (11), further comprising an adhesive applicator for applying an adhesive to the inner peripheral surface of the tread portion.

According to the present invention, when attaching the sound absorbing material to the inner peripheral surface of the tread portion of the tire, a method and an apparatus for fixing the sound absorbing material in the tire circumferential direction uniformly and accurately and with high productivity are provided. A tire with a high quality sound absorbing material can be stably provided.
Moreover, in the manufacturing method and apparatus of the present invention, since it is not necessary to extend the sound absorbing material, there is no problem that the sound absorbing material is easily peeled off after being applied to the inner peripheral surface of the tread portion of the tire.

  First, FIG. 1 shows a cross-sectional view in the width direction of a tire to which a sound absorbing material is attached using the method of the present invention. In addition, the structure of the tire to which the sound absorbing material is attached is not particularly limited, and may be a general structure. For example, in the illustrated tire 1, a bead core 3 is embedded in a bead portion 2, and a carcass 4 straddling between both bead portions 2 serves as a skeleton of the tire, and each side portion of the carcass 4 has a bead core 3. Wrapped around and fixed. On the radially outer side of the crown portion of the carcass 4, a belt 5 composed of three belt layers in which a large number of steel cords are covered with rubber is disposed in order from the inner layer side to the outer layer side. Both end portions of such a belt 5 are covered from the outer peripheral side by one or more layers 6 in the figure as a belt auxiliary layer. The tread portion 7 is disposed on the outer side in the radial direction of the belt 5, and there is a pair of sidewall portions 8 extending continuously inward in the radial direction on each side portion of the tread portion 7. E indicates the tire equatorial plane.

  In the tire 1, the sound absorbing material 30 is disposed at least on the inner peripheral surface of the tread portion 7. The end portions of the band-shaped sound absorbing material may be bonded to each other to form a ring shape, or may be used as a shape having a gap between the end portions.

  Here, the sound absorbing material 30 can be composed of a synthetic resin such as an ether-based polyurethane foam, or a foamed material having open cells or closed cells formed by foaming synthetic rubber or the like. It can also be constituted by a woven fabric, a nonwoven fabric, a knitted fabric or the like in which animal fibers, plant fibers, synthetic fibers and the like are intertwined and integrated.

Hereinafter, a method of attaching the sound absorbing material 30 to the inside of the tire 1 will be described in detail with reference to the drawings.
2 (a) to 2 (c) and FIGS. 3 (a) to 3 (c) are diagrams for explaining the tire manufacturing method of the present invention, and FIG. 2 (a) to (c) and FIG. (A)-(c) and it shows in order of a process.

  First, as shown in FIG. 2A, for example, the outer sides of five inscribed shafts 12 arranged at equal intervals on the same circumference having the same diameter as the inner circumferential surface of the tread portion of the tire to which the sound absorbing material is attached. Further, the sound absorbing material 30 is wound in an annular shape so that these inscribed shafts 12 are inscribed. The annular sound absorbing material 30 shown here is endless, the outer diameter of the ring is equal to the inner diameter of the tread portion of the tire, and has a length that can be attached to the inner peripheral surface of the tread portion of the tire without being expanded or contracted.

  Next, as shown in FIG. 2 (b), the five circumscribed shafts 22 (shown as hatched to distinguish from the inscribed shaft 12) arranged at equal intervals and between the inscribed shafts on the same circumference. The sound absorbing material 30 is disposed outside the sound absorbing material 30 so as to circumscribe the sound absorbing material 30 wound around the inscribed shaft 12. Next, as indicated by arrows in the figure, the five circumscribed shafts 22 are moved radially inward of the annular sound absorbing material, and the five inscribed shafts 12 are moved radially inward. At this time, it is preferable that the movement amounts of the five circumscribed shafts 22 and the five inscribed shafts 12 are the same, and all the shafts are moved under the mutual arrangement on the same circumference. At that time, the five circumscribed shafts 22 function to fold the contact portion of the sound absorbing material 30 toward the radially inner side so that the maximum diameter of the sound absorbing material is equal to or less than the rim diameter. On the other hand, the five inscribed shafts 12 move together with the five circumscribed shafts 22 and function to hold the folded sound absorbing material 30. As a result, the sound absorbing material 30 can be deformed into a substantially star shape having a maximum diameter equal to or smaller than the rim diameter as shown in FIG.

  Next, as shown in FIG. 3A, the sound absorbing material 30 whose outer diameter is reduced to a tire rim diameter or less in FIG. 2C is maintained in the interrelationship between the inscribed shaft 12 and the circumscribed shaft 22. As it is, it is inserted into the tire through the rim hole 1RH. Next, the five circumscribed shafts 22 are pulled out from the inside of the tire. Here, it is preferable that the tread portion inner circumferential surface 1IL of the tire at the stage shown in FIG. The adhesive or the like may be applied to the entire tread portion inner peripheral surface 1IL of the tire or may be applied partially. The application of the adhesive or the like may be performed using a spray or may be directly applied with a brush or the like. Moreover, you may provide an adhesive agent and an adhesive tape in the surface which contacts the tread part inner peripheral surface of a sound-absorbing material.

  Next, as shown in FIG. 3B, the five inscribed shafts 12 are moved outward in the radial direction, the sound absorbing material 30 is expanded again in an annular shape, and is brought into contact with the tread portion inner peripheral surface 1IL of the tire for adhesion. Fix with adhesive or adhesive tape.

  Here, as shown in FIG. 3C, by moving the five inscribed shafts 12 along the tread portion inner peripheral surface 1IL of the tire, the sound absorbing material 30 is pressed against the tread portion inner peripheral surface 1IL of the tire. It is preferable to bring them into contact with each other and achieve more secure fixation. In this case, if each inscribed shaft 12 is a so-called roller shaft that can rotate with the central axis of each shaft 12 as a rotation axis, the friction with respect to the sound absorbing material 30 is reduced, and contact can be performed more efficiently. is there. Further, the inscribed shaft 12 may be fixed and the tire 1 may rotate.

  In the above description, the number of the inscribed shafts 12 and the number of the circumscribed shafts 22 is 5. However, each shaft may be 3 or more, and depending on the rigidity and thickness of the sound absorbing material to be used, each shaft is moved. As long as the number of the sound absorbing materials is folded, the number of the sound absorbing materials does not interfere with each other.

  The tire 1 may be a raw tire before vulcanization molding or a product tire after vulcanization molding. However, when a raw tire is used, since the raw tire is vulcanized and molded after the sound absorbing material is attached, the sound absorbing material needs to be able to withstand pressure and heat during vulcanization molding.

  As described above, the application of the adhesive to the tire tread inner peripheral surface 1IL may be performed manually, but for example, the apparatus shown in FIG. 4 may be used. That is, FIG. 4 shows an example of an adhesive applicator for applying an adhesive to the tire tread inner peripheral surface 1IL. The adhesive applicator 40 is inserted into the tire through the rim hole of the tire, the jet outlet 40N thereof is directed to the inner peripheral surface 1IL of the tread portion, the adhesive 50 is jetted from the jet outlet 40N, and the jet outlet 40N is made of the tire. By rotating in the circumferential direction, the adhesive is applied over the entire circumference of the inner circumferential surface 1IL of the tread portion of the tire 1. In this example, the jet outlet 40N is rotated. However, the tire 1 may be rotated with the jet outlet 40N fixed.

  Furthermore, an apparatus configuration suitable for use in the above tire manufacturing method will be described with reference to FIGS. 5 (a) to 5 (c) and FIGS. 6 (a) to 6 (c).

5 (a) to 5 (c) are examples of the sound absorbing material holder of the tire manufacturing apparatus of the present invention, FIG. 5 (a) is a plan view thereof, and FIG. 5 (b) is FIG. 5 (a). ) Is a cross-sectional view taken along the line AA in FIG. 5, and FIG.
Now, the sound-absorbing material holder 10 shown in FIG. 5 is a device that enables the movement of each inscribed shaft 12 by connecting each of the inscribed shafts 12 described above with a link mechanism. That is, each of the inscribed shafts 12 is attached to the boss 11 via the same link mechanism. This link mechanism is a so-called ledge tong in which a plurality of links 13 having the same length are coupled by pins 14, and the inscribed shaft 12 is parallelly moved in the radial direction with respect to the boss 11 to be arranged on the same circumference. It is possible to move five inscribed shafts 12 inward in the radial direction in the same phase. When the five inscribed shafts 12 are moved, the five links 13 are interlocked to move so that the five inscribed shafts 12 are always arranged on the same circumference. That is, when the five inscribed shafts 12 move toward the boss 11, the outer diameter of the sound absorbing material holder 10 is increased in conjunction with each other so as to be arranged on the same circumference of the reduced circle. Move until it is less than the rim diameter. Similarly, when the five inscribed shafts 12 move outward in the radial direction of the circle, they move in conjunction with each other so as to be arranged on the same circumference of the enlarged circle.
The link mechanism may be driven via a motor, an air / hydraulic cylinder, or the like.

6 (a) to 6 (c) are examples of a sound absorbing material diameter reducing tool of the tire manufacturing apparatus of the present invention, FIG. 6 (a) is a plan view thereof, and FIG. 6 (b) is a diagram of FIG. 6 (a). Sectional drawing along the AA line, FIG.6 (c) shows the figure diameter-reduced from the state of FIG.6 (b).
As in the case of the sound absorbing material holder 10 shown in FIG. 5, the sound absorbing material diameter reducing tool 20 couples each circumscribed shaft 22 to the boss 21 through the same link mechanism, and moves each circumscribed shaft 22. It is a device that made it possible. However, as shown in FIGS. 6B and 6C, the outer shaft 22 has a structure in which the axial length is longer than that of the inner shaft 12. This is to prevent the mutual link mechanisms from interfering when the sound absorbing material is expanded / contracted using the sound absorbing material holder 10 and the sound absorbing material reducing tool 20.

Hereinafter, a method of attaching the sound absorbing material to the inner peripheral surface of the tread portion of the tire will be described using the tire manufacturing apparatus of the present invention shown in FIGS.
The sound absorbing material is wound around the five inscribed shafts 12 of the sound absorbing material holder 10 shown in FIG. 5, and the five circumscribed shafts 22 of the sound absorbing material reducing tool 20 shown in FIG. And so as to circumscribe. Here, in the sound absorbing material diameter reducing tool 20, only the extension part of the five circumscribed shafts 22 is flush with the sound absorbing material and the sound absorbing material holder 10 (the boss 11, the five inscribed shafts 12 and the links 13). Therefore, the boss 12, the link 13, and the sound absorbing material holder 10 of the sound absorbing material diameter reducing tool 20 do not interfere with each other.

The link mechanism of the sound absorbing material holder 10 and the sound absorbing material diameter reducing tool 20 moves each of the five inscribed shafts 12 and the five circumscribed shafts 22 radially inward while keeping the arrangement of the five inscribed shafts 12 on the same circumference. As described above, the sound absorbing material is given a folding shape whose maximum diameter is not more than the rim diameter.
Next, the sound absorbing material 30 whose outer diameter is reduced to be equal to or smaller than the rim diameter of the tire is inserted into the tire from the rim hole while maintaining the mutual relationship with the inscribed shaft 12 and the circumscribed shaft 22, and thereafter five The outer circumscribed shaft 22 is pulled out from the inside of the tire.
Next, the five inscribed shafts 12 are moved radially outward through the link mechanism, the sound absorbing material is expanded again in an annular shape, brought into contact with the inner peripheral surface of the tread portion of the tire, and an adhesive, an adhesive tape, etc. Fix through.

  In the above-described example, the sound absorbing material formed in a ring shape by connecting both ends in the longitudinal direction of the band-shaped sound absorbing material has been described, but the sound absorbing material formed into an annular shape by locking both ends of the band-shaped sound absorbing material with a shaft, etc. You may affix on the tread part inner peripheral surface of a tire. An endless ring-shaped sound absorbing material is preferable from the viewpoint of tire uniformity, but the ring-shaped sound absorbing material is difficult to be fixed by the conventional hand-pasting method as compared to the band shape, but according to the present invention, only the band-shaped sound absorbing material is used. In addition, it is easy to attach a ring-shaped sound absorbing material.

The width direction sectional view of the tire which attached the sound-absorbing material using the method of the present invention is shown. (A)-(c) is a figure for demonstrating the manufacturing method of the tire of this invention. (A)-(c) is a figure for demonstrating the manufacturing method of the tire of this invention. An example of the adhesive applicator for apply | coating an adhesive agent to the tread part inner peripheral surface of a tire is shown. (A)-(c) is an example of the sound-absorbing-material holder of the manufacturing apparatus of the tire of this invention, (a) is the top view, (b) is sectional drawing along the AA of (a). , (C) shows a diagram in which the diameter is reduced from the state of (b). (A)-(c) is an example of the sound-absorbing-material diameter reducing tool of the manufacturing apparatus of the tire of this invention, (a) is the top view, (b) is the cross section along the AA of (a). The figure and (c) show the figure diameter-reduced from the state of (b).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tire 1IL Tread part internal peripheral surface 1RH Rim hole 2 Bead part 3 Bead core 4 Carcass 5 Belt 6 Layer 7 Tread part 8 Side wall part 10 Sound absorption material holder 11, 21 Boss 12 Internal shaft 13, 23 Link 14, 24 Pin 20 Sound absorbing material reducing tool 22 External shaft 30 Sound absorbing material 40 Adhesive applicator 40N Spout 50 Adhesive E Tire equatorial surface

Claims (12)

In attaching the band-shaped sound absorbing material to at least the inner peripheral surface of the tread portion of the tire,
Folding the sound absorbing material into a size that allows the maximum diameter of the sound absorbing material to pass through the rim hole, and inserting it into the tire from the rim hole,
Next, in the tire, the folded sound absorbing material is expanded and brought into contact with the inner peripheral surface of the tread portion, and the sound absorbing material is fixed to the inner peripheral surface of the tread portion with an adhesive.   A band-shaped sound absorbing material is partially converged from the annularly expanded state toward the inner side in the radial direction of the ring, and a folding shape in which the maximum diameter of the sound absorbing material can pass through the rim hole is obtained. Is inserted into the tire through the rim hole, and then the fold-shaped sound absorbing material is expanded again into the annular shape inside the tire and brought into contact with the inner circumferential surface of the tread portion. A method for manufacturing a tire, comprising fixing a sound absorbing material. A band-shaped sound absorbing material is wound around at least three inscribed shafts arranged at equal positions on the same circumference, and at least three inscribed shafts between the inscribed shafts on the circumference and outside the sound absorbing material. Place the circumscribed shaft,
The inscribed shaft is moved inward in the radial direction of the sound absorbing material to a position aligned on a small circumference having a diameter less than the tire rim diameter, and the inscribed shaft is directed inward in the radial direction of the sound absorbing material. By moving to the inside of
Folding the contact area of the sound-absorbing material with the circumscribed shaft radially inward, and making the maximum diameter of the sound-absorbing material large enough to pass through the rim hole, the sound-absorbing material is inserted into the tire from the rim hole of the tire,
Next, after removing the circumscribed shaft from the sound absorbing material,
The inscribed shaft is moved toward a radially outer side of the sound absorbing material, the sound absorbing material is brought into contact with the inner peripheral surface of the tread portion, and the sound absorbing material is fixed to the inner peripheral surface of the tread portion through an adhesive. Tire manufacturing method.   The tire manufacturing method according to claim 1, wherein the tire is a product tire after vulcanization molding.   The tire manufacturing method according to claim 1, wherein the tire is a green tire before vulcanization molding. A sound absorbing material holder provided with at least three inscribed shafts arranged on the same circumference so as to be reduced and movable in a radial direction up to a small circumference having a diameter less than a tire rim diameter;
An apparatus for manufacturing a tire, comprising a combination of a sound absorbing material reducing tool provided with at least three circumscribed shafts arranged on the same circumference so as to be movable to an inner region of the small circumference.   In Claim 6, When the said inscribed shaft is arrange | positioned in the position which can contact a sound-absorbing material with a tread part inner peripheral surface, the said inscribed shaft can press a sound-absorbing material to a tread part inner peripheral surface, It is characterized by the above-mentioned. , Tire manufacturing equipment.   The tire manufacturing apparatus according to claim 7, wherein the inscribed shaft is capable of pressing the sound absorbing material against the inner peripheral surface of the tread portion by rotating about the central axis of the inscribed shaft.   8. The tire manufacturing apparatus according to claim 7, wherein the tire can be pressed against the inner peripheral surface of the tread portion by rotating the tire with the central axis of the tire as a rotation axis.   The tire manufacturing apparatus according to claim 9, wherein the tire is a product tire after vulcanization molding.   The tire manufacturing apparatus according to claim 9, wherein the tire is a green tire before vulcanization molding.   The tire manufacturing apparatus according to any one of claims 6 to 11, further comprising an adhesive applicator for applying an adhesive to the inner peripheral surface of the tread portion.

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