JP2012025319A - Pneumatic tire and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pneumatic tire, which is capable of engaging and attaching objects to the inner surface, and which rarely causes deterioration and degradation with time, thereby maintaining desired engagement force over a long period of time.SOLUTION: The pneumatic tire 1 has, in the tire inner surface 2, an engagement receiving part 4 which functions as a mechanical fastener having a bag like cross-sectional space 3 where at least the back is partially large. Meanwhile, in the method of manufacturing the pneumatic tire 1, the pneumatic tire is manufactured by installing a die transfer member which has the shape of the engagement receiving part 4 at the inner surface of a raw tire, and removing the type transfer member from the vulcanization molding tire after carrying out vulcanization molding of the raw tire.

Description

  The present invention relates to a pneumatic tire, and more particularly to a pneumatic tire that realizes a novel method of attaching an object to the inner surface of a pneumatic tire and a method for manufacturing the same.

  In recent years, various studies have been made on arranging objects having various functions on the inner peripheral surface of a pneumatic tire.

  For example, a mounting method of attaching a tire tag (high frequency identification tag) or a chip using a so-called hook-and-loop fastener such as a hook-and-loop fastener or a hook-and-hook fastener to an inner liner of a raw tire Has been proposed (Patent Document 1). Further, a pneumatic tire is proposed in which a surface fastener is vulcanized and bonded to a region corresponding to a tread portion on the tire inner surface, and a sound absorbing material is attached to the tire inner surface via the surface fastener (Patent Document 2). ).

  These surface fasteners proposed in Patent Documents 1 and 2 achieve a relatively strong engagement force at the time of mounting, and also have a surface shape without causing a problem of some positional deviation at the time of mounting work. This is preferable in that the engagement can be realized.

JP 2005-517581 A Japanese Patent No. 3916625

  However, on the other hand, the surface fasteners proposed in these patent documents are ideal in the engagement state of the individual engagement elements of the surface fastener because the inner peripheral surface of the pneumatic tire is an annular curved surface. Part of it floats at the end or center, etc., and the resulting engagement force varies (positional variation within the tire, variation between tires). In some cases, the expected engagement force may not be obtained.

  In addition, surface fasteners caused by the occurrence of partial physical deterioration and its progress by repeated deformation and compression due to rolling at high speed under relatively high temperature conditions for a long time. In some cases, it is difficult to maintain the desired engagement force over a long period of time due to deterioration and reduction of the entire engagement force over time.

  In view of the above-described points, an object of the present invention is a pneumatic tire in which an object can be engaged with and attached to the inner surface, and particularly, the obtained engagement force is large and the size thereof varies (the tire (Variation between tires. Variation between tires) hardly occurs, and even under severe use conditions in which deformation and compression accompanying tire rolling at relatively high temperature and high speed are repeated for a long time, It is an object of the present invention to provide a pneumatic tire capable of maintaining a desired engagement force over a long period of time and a method for manufacturing the same, in which the engagement force is less likely to be deteriorated or lowered over time.

The pneumatic tire of the present invention that achieves the above-described object has the following configuration (1).
(1) A pneumatic tire having an engagement receiving portion that functions as a mechanical fastener having a bag-shaped cross-sectional space that is wide at least partially on the inner surface of the tire.

In addition, the pneumatic tire of the present invention preferably has any one of the following configurations (2) to (7).
(2) The pneumatic tire according to (1), wherein the engagement receiving portion is intermittently disposed in a tire circumferential direction.
(3) The engagement receiving portion has a minimum value Ts of the diameter or width of the hole or groove in the inner surface portion of the tire, and a maximum value Th of the diameter or width of the hole or groove in the bag-shaped portion. The pneumatic tire according to (1) or (2), wherein the pneumatic tire has the relationship a).
1.2 ≦ Th / Ts ≦ 5.0 (a) Formula (4) The engagement receiving portion is made of rubber, and has a JIS hardness of 50 to 90 (1) to ( The pneumatic tire according to any one of 3).
(5) An object having a mechanical fastener having a shape and a size to be engaged with the engagement receiving portion is attached to the tire inner surface by engaging the mechanical fastener with the engagement receiving portion. The pneumatic tire according to any one of the above (1) to (4).
(6) The object is coated or mounted with (a) an electronic circuit including a sensor, (b) a balance weight, (c) a run-flat core, (d) an oxygen scavenger, a desiccant and / or an ultraviolet detection color former. The pneumatic tire according to (5), wherein the pneumatic tire is an object obtained by combining any one of these objects, (e) a sound absorbing material, and (f) a hook-and-loop fastener member, or a combination thereof.
(7) The mechanical fastener of the object includes a shaft portion diameter Ds, an engagement portion diameter Dh, a diameter or width minimum value Ts of a hole or groove in the tire inner surface portion, and the bag-shaped portion. The pneumatic tire according to (5) or (6) above, wherein the maximum value Th of the diameter or width of the hole or groove has a relationship of the following formulas (b) to (d):
0.8Ts ≦ Ds ≦ 1.2Ts (b) formula
0.6Th ≦ Dh ≦ 1.1Th (……) Formula (c)
1.2 ≦ Dh / Ds ≦ 5.0 (d) formula

Moreover, the method of manufacturing the pneumatic tire of the present invention has the following configuration (8).
(8) A method of manufacturing the pneumatic tire according to any one of (1) to (7) above, wherein a mold transfer member having the shape of the engagement receiving portion is installed on the inner surface of the raw tire, A method for producing a pneumatic tire, comprising: removing a mold transfer member from a vulcanized molded tire after vulcanizing the green tire.

  According to the first aspect of the present invention, there is provided a pneumatic tire in which an object can be engaged with and attached to the inner surface of the pneumatic tire, and the resulting engagement force is large and varies in size (position within the tire). (Variation between tires) is less likely to occur, and even under harsh use conditions that are repeated for a long time, the engagement force is less likely to deteriorate or decrease over time. A pneumatic tire capable of maintaining the engagement force is provided.

  According to the second aspect of the present invention, in addition to the effects of the first aspect of the present invention, positioning when engaging and mounting an object on the tire inner surface is both accurate and easy in the tire circumferential direction and the width direction. Can be.

  According to the third aspect of the present invention, in addition to having the effect of the first aspect of the invention, the manufacture of the engagement receiving portion is very easy.

According to the fourth aspect of the present invention, in addition to the effects of the first aspect of the present invention, a pneumatic tire having an engagement receiving portion with high engagement force and excellent durability is provided.
According to this invention concerning Claim 5 or Claim 6, the novel pneumatic tire which can attach the object which has a desired function to a tire inner surface, implement | achieving large engagement force and the outstanding durability. Is provided.

  According to the present invention according to claim 6 or claim 7, a novel pneumatic tire capable of attaching an object having a desired function to the inner surface of the tire while realizing a large engagement force and excellent durability. Is provided.

  According to the present invention of claim 8, a novel pneumatic tire capable of easily attaching an object having a desired function to the tire inner surface while realizing a large engagement force and excellent durability thereof is easily manufactured. A method of manufacturing a pneumatic tire that can be provided is provided.

(A), (b) is the partial cross section figure which showed one Embodiment of the pneumatic tire of this invention. (A), (b), (c) is the partial sectional view showing one embodiment of the pneumatic tire of the present invention. It is a principal part cross-section model figure which showed the example of the shape of the engagement receiving part used for the pneumatic tire of this invention. It is a principal part cross-section model figure which showed the example of the shape of the engagement receiving part used for the pneumatic tire of this invention shown to Fig.1 (a). FIG. 4 is a cross-sectional model view of a main part for explaining a state when an object-side engagement portion engaged with an engagement receiving portion shown in the model diagram of FIG. 4 used in the pneumatic tire of the present invention is engaged. is there. (A), (b), (c) is the top view which showed the model of the other example of the engagement receiving part of the pneumatic tire of this invention, respectively. (A)-(d) is the schematic sectional drawing which showed the example of the various aspects of the preferable structure of this attached object 5 typically. (A), (b) is the principal part cross-section model figure which showed the example of the shape of the member for transfer formation of the engagement receiving part which can be used for the example method of manufacturing the pneumatic tire of this invention. (A) is a partial cross section perspective view explaining the form employ | adopted in the Example of the pneumatic tire of this invention, (b) is a partial cross section perspective view explaining the form employ | adopted by the comparative example.

  Hereinafter, the pneumatic tire of the present invention will be described in more detail.

  The pneumatic tire according to the present invention is a bag that is widened at least partially on the tire inner surface 2 of the pneumatic tire 1 as shown in FIGS. 1A and 1B in model form. It has the engagement receiving part 4 which functions as a mechanical fastener which has the cross-sectional space 3 of a shape.

  With this configuration, an arbitrary object 5 having a desired function can be attached to the tire inner surface 2 via the engagement receiving portion 4 that functions as a mechanical fastener.

  As shown in FIG. 1A, the engagement receiving portion 4 may be formed by providing a bag-like cross-sectional space 3 at a predetermined location on the tire inner surface 2 formed by raising, or FIG. As shown in (b), a bag-like cross-sectional space 3 may be provided at a predetermined location on the tire inner surface 2 while maintaining a flat form. When manufacturing the engagement receiving portion 4, for example, the engagement receiving portion 4 can be manufactured using a vulcanization bladder having a convex shape corresponding to the bag-shaped cross-sectional space 3 having a wide back. Moreover, although the case where the engagement receiving part 4 is provided in the area | region corresponding to the tread part of a tire inner surface as shown in FIG. 1, you may provide in the part corresponding to a bead part in addition. Providing the engagement receiving portion 4 at a portion corresponding to the sidewall portion is that the sidewall portion repeatedly receives a large deformation as the tire travels, so that generally it is not possible to follow the large deformation and the engagement is easily disengaged. It is not preferable.

  The object 5 attached to the tire inner surface 2 is provided with a fastener material 6 having a shape that forms a pair with the bag-shaped cross-sectional space 3 of the tire engagement receiving portion 4 that is wide at the back, By engaging the fastener material 6 with the engagement receiving portion 4 of the tire, the object 5 having an arbitrary function desired to be attached can be attached to the inner surface of the tire.

  According to the method of attaching the object according to the present invention, the engagement position of the object to be attached to the tire inner surface is automatically and accurately compared with the case of attaching the object to the tire inner surface using a hook-and-loop fastener. Therefore, it is possible to easily cope with a case where a higher degree of accuracy is required for the installation position of the object. This is significant because it is in a narrow curved surface of the tire inner surface. The positioning accuracy described above is both the position in the tire width direction and the position in the circumferential direction.

  Further, in terms of engagement force, the engagement force is stable and large as compared with the case where an object is attached using a hook-and-loop fastener as described in the above-mentioned prior patent documents, and the engagement force decreases and deteriorates over time. The engagement state is small and can be maintained accurately and firmly over a long period of time. In addition, the concave and convex members of mechanical fasteners such as hooks and snap buttons can be configured at a lower cost than the case where they are installed on both the tire inner surface and the object to be attached. It is an advantage.

  The engagement receiving part 4 may be arrange | positioned intermittently in the tire circumferential direction, or may be arrange | positioned continuously. FIG. 2 (a) shows a case where the engagement receiving portions 4 are intermittently arranged in the tire circumferential direction. In this aspect, the object to be mounted is excellent in positioning in both the tire circumferential direction and the tire width direction. Can be engaged accurately. FIG. 2B shows a case where the engagement receiving portions 4 are continuously arranged in the tire circumferential direction. This FIG. 2 (b) has a continuous concave shape, groove shape or the like used for one of the engaging portions such as a so-called plastic bag with a chuck, and particularly an object to be attached in the tire width direction. The mounting position can be accurately positioned, and the engagement force in the circumferential direction is uniform and stable over the entire circumference. FIG. 2 (c) shows a part of a bag-shaped cross-sectional space 3 and an engagement receiving portion 4 formed at predetermined locations on the tire inner surface 2 formed by raising as shown in FIG. 1 (a). The cross-sectional perspective view is shown. When the engagement receiving portion 4 is configured in the structure as shown in FIG. 2C, the shape of the tire inner peripheral surface is the same on the inner periphery even if the engagement receiving portion 4 exists intermittently. It is excellent in that it does not deteriorate the tire uniformity.

  As shown in FIG. 3, the engagement receiving portion 4 has a shape in which the opening has a direction, and alternately inserts the fastener material 6 of the object 5 attached from, for example, 180 degrees different directions. You may make it match. In FIG. 3, an arrow DD indicates the tire circumferential direction, and an AA sectional view and a BB sectional view of the engagement receiving portion 4 are shown on the right side in FIG. 3. In this way, when the fastener material 6 of the object 5 is alternately inserted and engaged, for example, from a direction different by 180 degrees, the entire fastener material 6 is disengaged by an external force and is disengaged. It is excellent in that it is suppressed.

As shown in FIG. 4 (enlarged view of the engagement receiving portion in FIG. 1A), the engagement receiving portion 4 has a minimum value Ts of the diameter or width of the hole or groove in the tire inner surface portion, and the bag shape. It is preferable that the maximum value Th of the diameter or the width of the hole or groove in the portion of (2) has the relationship of the following formula (a).
1.2 ≦ Th / Ts ≦ 5.0 (Equation (a))

  When Th / Ts is larger than 5.0, it is generally difficult to produce, and when Th / Ts is smaller than 1.2, the engagement force is insufficient. More preferably, 1.5 ≦ Th / Ts ≦ 4.0 is satisfied.

  Moreover, the engagement receiving part 4 consists of rubber | gum, and it is preferable that the JIS hardness of this rubber | gum is 50-90. This is because when the engagement receiving portion 4 is made of rubber, the engagement force is greatly related to the magnitude of the engagement force. When the JIS hardness is less than 50, the engagement force tends to be insufficient. Since it is difficult to attach the target fastener, it is not preferable. The rubber constituting the engagement receiving portion 4 is preferably butyl rubber because it has excellent durability and is unlikely to deteriorate, and the engagement force does not decrease or deteriorate.

  According to the present invention, the engagement receiving portion 4 that functions as a mechanical fastener on the tire inner surface 2 and the fastener 6 of the object 5 having a desired function are engaged with each other, whereby a desired function is applied to the tire inner surface. It is possible to provide a pneumatic tire in which the object 5 having the above is engaged.

As shown in FIGS. 5 and 4, the mechanical fastener 6 included in the object has a minimum value of the diameter Ds of the shaft portion, the diameter Dh of the engaging portion, and the diameter or width of the hole or groove in the tire inner surface portion. It is preferable that Ts and the maximum value Th of the diameter or the width of the hole or groove of the bag-like portion have the following relationships (b) to (d).
0.8Ts ≦ Ds ≦ 1.2Ts Equation (b) 0.6Th ≦ Dh ≦ 1.1Th Equation (c) Equation 1.2 ≦ Dh / Ds ≦ 5.0 Equation (d)

  In particular, the most preferable range of Dh / Ds is 2 ≦ Dh / Ds ≦ 4 because of ease of assembly and the degree of burden on the engagement receiving portion.

  Further, as shown in FIGS. 6A to 6C, a notch 7 is formed in the ceiling portion above the bag-like space portion of the engagement receiving portion 4, and the fastener material 6 of the object 5 to be attached is formed. You may make it easy to insert. The incisions 7 have two incisions 7 as shown in FIGS. 6A to 6C in a straight line, or three incisions radially at a central angle of 120 degrees, or 90 degrees. Any of the four incisions in a radial (cross-shaped) shape at the center angle of may be used.

  7A to 7D schematically show various examples of preferable structures of the object 5 to be attached. 6 is a fastener material, and a sheet material (cloth, film, rubber sheet, etc.) 8 in which the fastener material 6 is previously installed is attached to or wrapped with the object material 5, An object can be constructed (FIGS. 7A to 7C). FIG. 4A shows an example in which only the surface of the object 5 on the tire side is covered with the sheet material 8, and FIG. 5B shows the sheet material 8 except for a part of the surface of the object 5 on the side opposite to the tire. (C) shows an example in which the entire surface of the object 5 is covered with the sheet material 8.

  In the case where the object 5 is entirely soft, such as a sponge, for example, the fastener material 6 may be installed with the upper surface and the lower surface of the object being sandwiched. This mode is shown in FIG. 7D, and the sheet material 8 may not be used or may be used appropriately. As the sheet material 8, it is preferable to use cloth, film, rubber sheet or the like having appropriate flexibility.

  The object 5 may be determined according to its desired characteristics, and is not particularly limited. For example, (a) an electronic circuit including a sensor, (b) a balance weight, and (c) a run flat Or (d) an oxygen-absorbing agent, a desiccant and / or an object coated or mounted with an ultraviolet detection color former, (e) a sound-absorbing material, or (f) a hook-and-loop fastener member, or a combination thereof. The case where it is an object is preferable. In particular, a sound-absorbing material made of an elastic porous material such as sponge or foamed synthetic resin material is recently preferred as an object used in the present invention because it is strongly desired to reduce the noise generated by tires. Further, the hook-and-loop fastener member is also useful as an object used in the present invention because the hook-and-loop fastener member can function as an interposer for satisfactorily attaching another object.

  Of these combinations, specific effects can be expected in particular from (a) a balance weight and a sound absorbing material, (b) a sound absorbing material and an ultraviolet detecting material, (c) a sound absorbing material and a desiccant, and (d) an electronic circuit. Combination of desiccant, etc. That is, it is possible to use the second object in combination as a functional object effective to realize the special function of one object (first object) stably over a long period of time. It is particularly effective.

  In the present invention, at the tire inner surface, at least two engagement receiving portions 4 are installed on the tire inner surface, and the installation positions are substantially the same in the tire width direction and arranged in a single or plural rows. Preferably it is. For example, one row at the center (tire equator), one row near both tread ends, or two parallel rows provided only near one tread end, only near one tread end A preferable example is two rows with a shifted phase, such as a staggered arrangement. There may be a plurality of columns. Further, the area where the engagement receiving portion 4 is installed may be the inner surface of the tire, but depending on the function of the object to be attached, it is provided in either the area corresponding to the tread portion or the area corresponding to the bead portion. Is preferred.

  According to the knowledge of the present inventors, the installation region is preferably a region corresponding to the tread portion or a region corresponding to the bead portion, and as described above, the side wall portion is preferable because deformation of the tire inner surface is large during traveling. Absent.

  The method for producing the pneumatic tire of the present invention described above is not particularly limited, but a mold transfer member having the shape of the engagement receiving portion 4 is installed on the inner surface of the raw tire, and the raw tire is vulcanized. It is a simple and preferred method to manufacture by removing the mold transfer member 9 from the vulcanized tire after molding. FIGS. 8A and 8B show examples of the mold transfer member 9.

  That is, an unvulcanized rubber sheet 12 in which a mold transfer member 9 having the shape of the engagement receiving portion 4 is embedded in advance with an inner liner 10 (or a laminate of the inner liner 10 and the carcass 11). Then, after winding this around a molding drum and vulcanizing and molding the tire, only the mold transfer member 9 having the shape of the engagement receiving portion 4 is removed to produce a pneumatic tire having the desired engagement receiving portion 4. it can. Reference numeral 12 denotes an engagement receiving portion formed so as to rise on the inner surface of the tire, and 12E denotes end portions of the 12 engagement receiving portions that extend in the tire circumferential direction of the engagement receiving portion 12.

  In this method, the engagement receiving portion 12 (and the bag-like cross-sectional space inside thereof) formed so as to be raised on the inner surface of the tire is formed of vulcanized rubber. It is obtained as a sufficiently high durability.

  Hereinafter, specific configurations and effects of the present invention will be described with reference to Examples and Comparative Examples.

Example 1 and Comparative Example 1
For the pneumatic tire of Example 1 of the present invention of the mode shown in FIG. 9A and Comparative Example 1 shown in FIG. 9B, the objects are engaged, and the engagement force and the engagement force A comparative experiment was conducted for durability.

  In the first embodiment, the engagement receiving portions 4 having the shape shown in FIG. 1A are formed in two rows in parallel at equal pitches (10 mm) only around one tread end and around the entire circumference. The distance between the end portions of the engagement receiving portions in the width direction of the two rows is 30 mm, and Th = 3.0 mm and Ts = 1.0 mm shown in FIG.

  In the first embodiment, as shown in FIG. 8, a rubber sheet 12 made of butyl rubber in which a mold transfer member 9 having the shape of an engagement receiving portion is embedded is preliminarily applied to a laminate of an inner liner 10 and a carcass 11. The tire was vulcanized by winding it around a molding drum, and after that, only the mold transfer member 9 having the shape of the engagement receiving portion 4 was removed from the vulcanized molded tire.

The thing of the comparative example 1 joins the surface fastener (hook material) 13 to the tire center part in the tape shape of width 30mm by the vulcanization adhesion over the perimeter of the tire inner surface.
The object to be attached to each was a sound absorbing material (foamed polyurethane resin) having a width of 100 mm and a thickness of 20 mm.

  Specifically, as an object for the first embodiment, fasteners (convex type) (one side member of a metal hook) are provided in two parallel rows at an equal pitch (10 mm) over the entire circumference. The thing of the distance from the edge part of the fastener material of the width direction to an edge part was 30 mm.

  As an object for Comparative Example 1, a surface fastener (loop material) 13 was provided in a tape shape having a width of 30 mm over the entire circumference.

  In either case, the sound-absorbing material (foamed polyurethane resin) is covered with a woven fabric and fixed with a fastener (convex type) or a hook-and-loop fastener (loop material) 13 interposed therebetween.

  By the above method, the test of attaching the sound absorbing material to the inner surface of each test tire by the respective engagement method and then peeling the sound absorbing material was repeated 50 times.

  The level of the level of degradation of the engagement force was determined by comparing the magnitude of the engagement force as the resistance force at the time of peeling and the engagement force at the first time, the 10th time, and the 50th time.

  The peeling was a measurement method according to JIS L3416, and the peel strength when peeling at an angle of 90 degrees was determined, and the value was indexed for comparative evaluation.

  The results are shown in Table 1. According to the present invention, it can be seen that the absolute value of the engaging force is large and the deterioration thereof is very small as compared with that of Comparative Example 1.

1: Pneumatic tire 2: Tire inner surface 3: Bag-shaped sectional space 4: Engagement receiving portion 5: Object 6: Fastener material
7: Cut 8: Sheet material (cloth, film, rubber sheet, etc.)
9: Mold transfer member having shape of engagement receiving portion 10: Inner liner 11: Carcass
12: Rubber sheet 12E in which a mold transfer member having the shape of the engagement receiving portion 4 is embedded: End portion 13 extending in the circumferential direction of the rubber sheet 12: Hook fastener DD: Tire circumferential direction Ts: Hole in the tire inner surface portion Or the minimum value Th of the diameter or width of the groove Th: the maximum value of the diameter or width of the hole or groove in the bag-like portion Ds: the diameter Dh of the shaft portion D: the diameter of the engaging portion

Claims (8)

  A pneumatic tire comprising an engagement receiving portion functioning as a mechanical fastener having a bag-shaped cross-sectional space having a wide back at least in part on an inner surface of the tire.   The pneumatic tire according to claim 1, wherein the engagement receiving portion is intermittently disposed in the tire circumferential direction. The engagement receiving portion has a minimum value Ts of the diameter or width of the hole or groove in the inner surface portion of the tire and a maximum value Th of the diameter or width of the hole or groove in the bag-shaped portion. The pneumatic tire according to claim 1, wherein the pneumatic tire has a relationship.
1.2 ≦ Th / Ts ≦ 5.0 (Equation (a))   The pneumatic tire according to any one of claims 1 to 3, wherein the engagement receiving portion is made of rubber and has a JIS hardness of 50 to 90.   An object having a mechanical fastener having a shape and a size to be engaged with the engagement receiving portion is attached to the inner surface of the tire by engaging the mechanical fastener with the engagement receiving portion. The pneumatic tire according to any one of claims 1 to 4.   The object is (a) an electronic circuit including a sensor, (b) a balance weight, (c) a run-flat core, (d) an object coated or mounted with an oxygen scavenger, a desiccant and / or an ultraviolet detection color former, The pneumatic tire according to claim 5, wherein the pneumatic tire is an object obtained by combining one or more of (e) a sound absorbing material and (f) a hook-and-loop fastener member. The mechanical fastener of the object includes a shaft portion diameter Ds, an engagement portion diameter Dh, a diameter or width minimum value Ts of the hole or groove in the tire inner surface portion, and a hole or groove in the bag-like portion. The pneumatic tire according to claim 5 or 6, wherein the maximum value Th of the diameter or the width of the tire has a relationship represented by the following formulas (b) to (d).
0.8Ts ≦ Ds ≦ 1.2Ts (b) formula
0.6Th ≦ Dh ≦ 1.1Th (……) Formula (c)
1.2 ≦ Dh / Ds ≦ 5.0 (d) formula   A method for producing a pneumatic tire according to any one of claims 1 to 7, wherein a mold transfer member having the shape of the engagement receiving portion is installed on the inner surface of the raw tire, and the raw tire is vulcanized. And then removing the mold transfer member from the vulcanized molded tire.

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