JP2011042235A - Tire and manufacturing method for tire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tire enhancing durability by suppressing the intrusion of air without reducing traveling performance. <P>SOLUTION: Characteristically, the tire 10 includes: an annular tire case 17 formed of a thermoplastic material; and a reinforcement layer 28 formed by winding/joining a covering cord member 26 formed by covering a reinforcement cord 26A with a first covering thermoplastic material 27 on a crown part 16 of the tire case 17. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a tire to be mounted on a rim and a method for manufacturing the tire, and more particularly to a tire at least partly formed of a thermoplastic material and a method for manufacturing the tire.

  Conventionally, pneumatic tires made of rubber, organic fiber materials, steel members, and the like are used in vehicles such as passenger cars.

In recent years, it has been required to use a thermoplastic material such as a thermoplastic resin or a thermoplastic elastomer as a tire material because of weight reduction and ease of recycling.
For example, Patent Document 1 discloses a pneumatic tire formed using a thermoplastic polymer material.

Japanese Patent Laid-Open No. 03-143701

  In the pneumatic tire of Patent Document 1, from the viewpoint of durability, riding comfort, running performance, and the like, a reinforcing cord is wound around the outer peripheral portion of the tire frame member in a continuous spiral shape to form a reinforcing layer. However, when a reinforcing cord is spirally wound directly on the surface of the crown portion of a tire frame member molded using a thermoplastic polymer material and another tire component member (for example, a tread) is disposed on the reinforcing cord, the reinforcement is applied. A gap may be generated around the cord (between the reinforcing cord and the crown), and air may remain (air enters). When the air enters, even if the reinforcing cord is bonded to the crown portion surface with an adhesive, the reinforcing cord may move due to the input during running and reduce the durability of the tire. For this reason, in Patent Document 1, the reinforcement cord is embedded in the cushion rubber provided in the crown portion to form a reinforcement layer, thereby suppressing the occurrence of air around the reinforcement cord and suppressing the movement of the reinforcement cord. ing.

  However, in order to embed the reinforcing cord, it is necessary to unnecessarily increase the thickness of the cushion rubber. When the thickness of the cushion rubber is increased, the cushion rubber has an increased weight, an increase in the property change width of the member in the thickness direction, and a low elastic modulus of the cushion rubber compared to the thermoplastic polymer material. It is conceivable that the running performance is lowered in that the power cannot be fully exhibited, and further improvement is required.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a tire with improved durability by suppressing air entry without deteriorating running performance, and a method for manufacturing the tire. is there.

  The tire according to claim 1 includes an annular tire frame member formed of a thermoplastic material, and a coated cord member formed by coating a reinforcing cord with a first coating thermoplastic material, and an outer periphery of the tire frame member. And a reinforcing layer formed by being wound around and bonded to the portion.

  According to the tire of claim 1, since the covering cord member is wound and joined to the outer peripheral portion of the tire frame member formed of the thermoplastic material to form the reinforcing layer, the puncture resistance and the cut resistance are reduced. And circumferential rigidity of the tire (tire frame member) are improved. In addition, by improving the circumferential rigidity, creep of the tire frame member formed of a thermoplastic material (a phenomenon in which the plastic deformation of the tire frame member increases with time under a certain stress) is suppressed.

  Further, since the reinforcing cord of the covering cord member is covered with the first covering thermoplastic material, the air around the reinforcing cord is suppressed and the movement of the reinforcing cord is suppressed. Here, when a tire constituent member such as a tread is disposed on the outer peripheral side of the reinforcing layer, the covering cord member is joined to the outer peripheral portion, so that the covering cord member (including the reinforcing cord) is moved by an input during traveling or the like. Is suppressed and durability is improved.

  On the other hand, since the reinforcing cord is covered with the first covering thermoplastic material and the surrounding air is suppressed, the weight of the reinforcing cord is increased in the thickness direction when compared with that in which the reinforcing cord is embedded in cushion rubber or the like. A decrease in running performance such as an increase in the physical property change width of the member and a lack of lateral force during running is suppressed.

  A tire according to a second aspect is the tire according to the first aspect, wherein the reinforcing cord and the first covering thermoplastic material are joined together by an adhesive.

  According to the tire of claim 2, since the reinforcing cord and the first covering thermoplastic material are joined by the adhesive, the adhesion between the reinforcing cord and the first covering thermoplastic material is improved. Further, the air around the reinforcing cord is further suppressed. Further, the joining of the reinforcing cord and the first covering thermoplastic material further suppresses the movement of the reinforcing cord, thereby suppressing the deterioration (such as generation of cracks) of the first covering thermoplastic material.

  A tire according to a third aspect is the tire according to the first or second aspect, wherein the outer peripheral portion and the covering cord member are joined by welding.

  According to the tire of the third aspect, since the outer peripheral portion and the coated cord member are bonded by welding, the bonding strength between the outer peripheral portion and the coated cord member is improved.

  A tire according to a fourth aspect is the tire according to the third aspect, wherein the thermoplastic material and the first covering thermoplastic material are the same type.

  According to the tire of claim 4, since the thermoplastic material and the first covering thermoplastic material are the same type, the thermoplastic material and the first covering thermoplastic material are welded to the outer peripheral portion and the covering cord member. Are mixed well and the bonding strength between the outer peripheral portion and the coated cord member is improved.

  A tire according to a fifth aspect is the tire according to the first or second aspect, wherein the outer peripheral portion and the coated cord member are joined together by an adhesive.

  According to the tire of claim 5, even if the thermoplastic material of the outer peripheral portion and the first covering thermoplastic material of the reinforcing cord member are difficult to weld, the outer peripheral portion and the coated cord can be obtained by using an adhesive. The member can be joined.

  A tire according to a sixth aspect is the tire according to any one of the first to fifth aspects, wherein the covering cord member is wider on the joining side to the outer peripheral portion than on the opposite side.

  According to the tire of the sixth aspect, since the coated cord member is wider on the joining side to the outer peripheral portion than the opposite side, the joining area (joining force) between the outer peripheral portion and the reinforcing cord member is ensured. .

  A tire according to a seventh aspect is the tire according to any one of the first to sixth aspects, wherein the coated cord member has a flat surface on the side joined to the outer peripheral portion.

  According to the tire of claim 7, since the coated cord member has a flat surface on the side joined to the outer circumferential portion, the coated cord member is formed between the outer circumferential portion and the coated cord member as compared with the coated cord member having a circular cross section. It is difficult for a gap to occur between them, and a bonding area is effectively secured.

  A tire according to an eighth aspect is the tire according to any one of the first to seventh aspects, wherein the coated cord member has a flat surface on the side opposite to the side joined to the outer peripheral portion.

  According to the tire of the eighth aspect, since the coated cord member has a flat surface on the side opposite to the side joined to the outer peripheral portion, a tire constituent member such as a tread is disposed (joined) on the outer peripheral side of the reinforcing layer. ), The gap between the flat surface on the opposite side to the outer peripheral portion and the inner peripheral surface of the tire constituent member is unlikely to be generated, and a joining area is secured, and the reinforcing layer and the tire constituent member are Bonding force is improved.

  A tire according to a ninth aspect is the tire according to any one of the first to eighth aspects, wherein the tire is formed of a second coating thermoplastic material, joined to the outer peripheral portion, covers the reinforcing layer, and has an outer peripheral surface. It has the coating layer made flat.

  According to the tire of the ninth aspect, the gap generated between the adjacent coated cord members is covered with the coating layer whose outer peripheral surface is flat. Here, when a tire constituent member such as a tread is disposed (joined) on the outer peripheral surface of the covering layer, the tire constituent member is joined to the reinforcing layer in a state where a gap is formed between adjacent covering cord members. In comparison, it is difficult for a gap to be formed between the two, and air entry is suppressed. As a result, a bonding area (bonding force) between the tire constituent member and the coating layer is ensured, and peeling between the tire constituent member and the coating layer is suppressed by an input at the time of traveling and the durability is improved. To do.

  A tire according to a tenth aspect is the tire according to the ninth aspect, wherein the first covering thermoplastic material and the second covering thermoplastic material are the same type.

  In the tire according to claim 10, since the first covering thermoplastic material and the second covering thermoplastic material are the same type, for example, the reinforcing layer is formed of the second covering thermoplastic material in a molten or softened state. When the covering layer is formed by covering, the first covering thermoplastic material and the second covering thermoplastic material are well mixed, and the bonding strength between the covering cord member and the covering layer is improved.

  The tire manufacturing method according to claim 11 includes a covering cord member forming step of forming a covering cord member by covering a reinforcing cord with a first covering thermoplastic material, and an annular tire frame member formed of a thermoplastic material. A covering cord member winding step of winding and covering the covering cord member around the outer periphery of the covering cord member.

  According to the tire manufacturing method of claim 11, the coated cord member is formed by coating the reinforcing cord with the first coating thermoplastic material, and the coated cord member is wound around the outer peripheral portion of the tire frame member. Be joined. Here, since the reinforcing cord is covered with the first covering thermoplastic material, the air around the reinforcing cord is suppressed and the movement of the reinforcing cord is suppressed.

  The tire manufacturing method according to claim 12 is the tire manufacturing method according to claim 11, wherein in the covering cord member forming step, an adhesive layer is formed on an outer peripheral surface of the reinforcing cord, and the reinforcing cord is interposed through the adhesive layer. The first coating thermoplastic material melted or softened is coated and joined.

  According to the tire manufacturing method of the twelfth aspect, since the first covering thermoplastic material melted or softened to the reinforcing cord via the adhesive layer is coated and joined, the reinforcing cord and the first covering heat The plastic material is in close contact with each other, and the air around the reinforcing cord is suppressed. Further, the joining of the reinforcing cord and the first covering thermoplastic material further suppresses the movement of the reinforcing cord, thereby suppressing the deterioration (such as generation of cracks) of the first covering thermoplastic material.

  In the tire manufacturing method according to a thirteenth aspect, in the tire manufacturing method according to the twelfth aspect, in the covering cord member forming step, the reinforcing cord is washed before the adhesive layer is formed.

  According to the tire manufacturing method of the thirteenth aspect, since the reinforcing cord is washed before the adhesive layer is formed, the adhesive layer is uniformly formed on the outer peripheral surface of the reinforcing cord. Thereby, the adhesiveness between the reinforcing cord and the first covering thermoplastic material is further improved, and the air around the reinforcing cord is suppressed. In addition, since the adhesive layer is uniformly formed on the outer peripheral surface of the reinforcing cord, the bonding area between the reinforcing cord and the first covering thermoplastic material is increased, and the movement of the reinforcing cord is further suppressed. Deterioration (such as generation of cracks) of the thermoplastic material for use is suppressed.

  The tire manufacturing method according to claim 14 is the tire manufacturing method according to any one of claims 11 to 13, wherein, in the covering cord member winding step, the first covering heat of the covering cord member. At least one of the thermoplastic material and the thermoplastic material of the crown portion of the portion to which the coated cord member is joined is melted or softened, and the crown portion and the coated cord member are joined by welding.

  According to the tire manufacturing method of claim 14, at least one of the first covering thermoplastic material of the coated cord member and the thermoplastic material of the crown portion of the portion to which the coated cord member is joined is melted or softened. Thus, since the crown portion and the coated cord member are bonded by welding, the bonding strength between the outer peripheral portion and the coated cord member is improved. When both the first covering thermoplastic material of the coated cord member and the thermoplastic material of the crown portion of the portion to which the coated cord member is joined are brought into a molten or softened state, only one of them is melted or softened. Compared with the case of making it, the thermoplastic material and the first covering thermoplastic material mix well, and the bonding strength between the outer peripheral portion and the covering cord member is further improved.

  The tire manufacturing method according to claim 15 is the tire manufacturing method according to any one of claims 11 to 13, wherein in the covering cord member winding step, the outer peripheral portion and the covering cord member are bonded to each other. To join.

  According to the tire manufacturing method of claim 15, since the outer peripheral portion and the coated cord member are joined with an adhesive, the outer peripheral portion thermoplastic material and the first covering thermoplastic material of the coated cord member are welded together. Even if it is a difficult material, an outer peripheral part and a covering cord member can be joined.

  The tire manufacturing method according to claim 16 is the tire manufacturing method according to any one of claims 11 to 15, wherein, in the covering cord member forming step, the joining side to the outer peripheral portion is wider than the opposite side. The coated cord member is formed.

  According to the tire manufacturing method of claim 16, since the coated cord member is formed such that the joint side to the outer peripheral portion is wider than the opposite side, when the coated cord member is wound and joined to the outer peripheral portion, It is possible to sufficiently secure the bonding area (bonding force) between the portion and the reinforcing cord member.

  The tire manufacturing method according to claim 17 is the tire manufacturing method according to any one of claims 11 to 16, wherein, in the covering cord member forming step, the covering to be joined to the outer peripheral portion is a flat surface. A cord member is formed.

  According to the tire manufacturing method of claim 17, since the coated cord member having a flat surface on the joining side to the outer peripheral portion is formed, when the coated cord member is wound and joined to the outer peripheral portion, the outer peripheral portion and the covering are coated. A gap is hardly generated between the cord member and the bonding area is effectively secured. Further, the covering cord member can be wound around the outer peripheral portion without meandering.

  The tire manufacturing method according to claim 18 is the tire manufacturing method according to any one of claims 11 to 17, wherein, in the covering cord member forming step, a side opposite to a side joined to the outer peripheral portion is a flat surface. The coated cord member is formed.

  According to the tire manufacturing method of claim 18, since the coated cord member having a flat surface opposite to the side joined to the outer peripheral portion is formed, the coated cord member is wound and joined to the outer peripheral portion, and the outer peripheral side When a tire constituent member such as a tread is joined to the outer peripheral portion of the coated cord member, a gap is unlikely to occur between the flat surface on the opposite side to the outer peripheral portion of the coated cord member and the tire constituent member, and a sufficient joining area is ensured. .

  The tire manufacturing method according to claim 19 is the tire manufacturing method according to any one of claims 11 to 18, wherein the covering cord member embedded in the outer peripheral portion is melted or softened. A covering cord member covering step of covering with a plastic material;

  According to the tire manufacturing method of the nineteenth aspect, since the covering cord member embedded in the outer peripheral portion is covered with the second covering thermoplastic material melted or softened, a gap generated between the adjacent covering cord members is formed. Filled with a second coating thermoplastic material in a molten or softened state. And the 2nd thermoplastic resin for a coating | cover in a molten or softened state spreads right and left, and the surface approaches flat shape. Here, when a tire constituent member such as a tread is disposed on the surface of the solidified second thermoplastic resin material for covering, there is hardly any gap between the two, and pneumatic entry is effectively suppressed.

  As described above, since the tire according to the present invention has the above-described configuration, pneumatic performance is suppressed and durability is improved without deteriorating running performance. In addition, the tire manufacturing method of the present invention can manufacture a tire with improved air durability and improved durability without deteriorating running performance.

(A) is sectional drawing along the tire width direction of the tire of 1st Embodiment. (B) is an expanded sectional view along the tire width direction of the bead part in the state where the rim is fitted to the tire of the first embodiment. It is sectional drawing along the tire width direction which shows the circumference | surroundings of the coating | coated cord member wound and joined to the crown part of the tire of 1st Embodiment. It is a perspective view of a molding machine. (A) is a perspective view which shows the state where the protrusion amount of the cylinder rod of the tire support part of a molding machine is the smallest. (B) is a perspective view showing a state in which the protruding amount of the cylinder rod of the tire support portion of the molding machine is the largest. It is a perspective view of the extruder for demonstrating the operation | movement which adheres the thermoplastic material for welding to the junction part of a case division body using an extruder. It is a schematic diagram for demonstrating the operation | movement which forms an adhesive layer in a reinforcement cord using a cord adhesive layer apparatus. It is a schematic diagram for demonstrating the operation | movement which coat | covers and joins the 1st thermoplastic resin to a reinforcement cord using a cord coating apparatus. It is explanatory drawing for demonstrating the operation | movement which winds a coating | coated code | cord member around the crown part of a tire case, and joins it using a cord heating apparatus and rollers. It is explanatory drawing for demonstrating the operation | movement which covers the covering cord member wound and joined to the crown part of the tire case with the 2nd thermoplastic resin for a covering. FIG. 6 is a cross-sectional view in the width direction of the tire case showing a state in which the covering cord member wound and joined to the crown portion of the tire case is covered with a second covering thermoplastic material. It is sectional drawing along the tire width direction which shows the circumference | surroundings of the coating | coated cord member wound by the crown part of the tire and embed | buried. It is principal part sectional drawing of the crown part for demonstrating the operation | movement which embeds a covering cord member by making the crown part of a tire into a molten or softened state. It is sectional drawing along the tire width direction which shows the circumference | surroundings of the coating | coated cord member wound and joined to the crown part of the tire of other embodiment. It is explanatory drawing for demonstrating the operation | movement which covers the coating | coated cord member wound and joined to the crown part of the tire case of other embodiment with a welding sheet | seat. It is sectional drawing which shows the cross section along the tire rotating shaft of the tube type tire of other embodiment.

[First Embodiment]
Hereinafter, a tire according to a first embodiment of the tire of the present invention will be described with reference to the drawings. As shown in FIG. 1A, the tire 10 of the present embodiment has a cross-sectional shape substantially similar to that of a conventional general rubber pneumatic tire.

  As shown in FIG. 1 (A), the tire 10 has a pair of bead portions 12 (see FIG. 1 (B)) that contact the bead seat 21 and the rim flange 22 of the rim 20, and outward from the bead portion 12 in the tire radial direction. An annular tire case 17 (tire frame member) composed of an extending side portion 14 and a crown portion 16 (outer peripheral portion) that connects a tire radial direction outer end of one side portion 14 and a tire radial direction outer end of the other side portion 14. Example).

Here, the tire case 17 of the present embodiment is formed of a single thermoplastic material. However, the present invention is not limited to this configuration, and the tire case is similar to a conventional general rubber pneumatic tire. You may use the thermoplastic material which has a different characteristic for every 17 parts (bead part 12, side part 14, crown part 16, etc.).
Further, a reinforcing material (polymer material, metal fiber, cord, nonwoven fabric, woven fabric, etc.) is embedded in the tire case 17 (for example, the bead portion 12, the side portion 14, the crown portion 16 and the like), and the reinforcing material is provided. The tire case 17 may be reinforced.

  As the thermoplastic material, a thermoplastic resin, a thermoplastic elastomer (TPE), or the like can be used. However, it is preferable to use a thermoplastic elastomer in consideration of elasticity required at the time of traveling and moldability at the time of manufacture.

  Examples of the thermoplastic elastomer include amide-based thermoplastic elastomer (TPA), ester-based thermoplastic elastomer (TPC), olefin-based thermoplastic elastomer (TPO), styrene-based thermoplastic elastomer (TPS) specified in JIS K6418, Examples thereof include urethane-based thermoplastic elastomer (TPU), crosslinked thermoplastic rubber (TPV), and other thermoplastic elastomers (TPZ). In addition, the same kind of thermoplastic material refers to forms, such as ester systems and styrene systems.

  Examples of the thermoplastic resin include urethane resin, olefin resin, vinyl chloride resin, polyamide resin, and the like.

  As these thermoplastic materials, for example, the deflection temperature under load specified at ISO 75-2 or ASTM D648 (at the time of 0.45 MPa load) is 78 ° C or higher, the tensile yield strength specified by JIS K7113 is 10 MPa or higher, Similarly, the tensile yield elongation specified in JIS K7113 is 10% or more, the tensile breaking elongation specified in JIS K7113 (JIS K7113) is 50% or more, and the Vicat softening temperature (Method A) specified in JIS K7206 is 130 °. C or more can be used.

  An annular bead core 18 made of a steel cord is embedded in the bead portion 12 of the present embodiment, similar to a conventional general pneumatic tire. However, the present invention is not limited to this configuration, and the bead core 18 may be formed of an organic fiber cord, a resin-coated organic fiber cord, or a hard resin in addition to the steel cord. Further, if the rigidity of the bead portion 12 is ensured and there is no problem with the fitting with the rim 20, the bead core 18 may be omitted (see FIG. 15).

  Further, as shown in FIG. 1B, in the present embodiment, a thermoplastic material that forms a tire case 17 in a contact portion of the bead portion 12 with the rim 20 and at least a portion of the rim 20 in contact with the rim flange 22 is used. In addition, a material having excellent sealing properties (a material having high sealing properties), for example, an annular sealing layer 24 (an example of a sealing portion) made of rubber is formed. This seal layer 24 may also be formed in a portion that contacts the bead sheet 21.

  As the rubber forming the seal layer 24, it is preferable to use the same type of rubber as that used on the outer surface of the bead portion of a conventional general rubber pneumatic tire. It should be noted that the rubber seal layer 24 may be omitted as long as the sealing property between the rim 20 and the thermoplastic material can be ensured with only the thermoplastic material, and other sealing materials that have better sealing properties than the thermoplastic material forming the tire case 17. Various types of thermoplastic materials may be used.

  As shown in FIGS. 1A and 2, a covering cord member 26 is wound around the crown portion 16 to form a reinforcing layer 28 (shown by a broken line in FIG. 2). The covering cord member 26 is formed by covering and joining a first covering thermoplastic material 27 to a reinforcing cord 26A having higher rigidity than the thermoplastic material forming the tire case 17. The reinforcing cord 26A and the first covering thermoplastic material 27 are bonded by an adhesive (details will be described later), and an adhesive layer is formed on the entire outer peripheral surface of the reinforcing cord 26A. . Further, the covering cord member 26 is welded to the covering cord member 26 and the crown portion 16 at the contact portion with the crown portion 16.

  The reinforcing cord 26A may be a monofilament (single wire) such as a metal fiber or an organic fiber, or a multifilament (stranded wire) obtained by twisting these fibers. In the present embodiment, a steel cord twisted with steel fibers is used as the reinforcing cord 26A. The reinforcing layer 28 corresponds to a belt disposed on the outer peripheral surface of the carcass of a conventional rubber pneumatic tire.

  The reinforcing layer 28 is covered with a covering layer 29. The covering layer 29 is formed of the second covering thermoplastic material, and both end portions in the width direction of the covering layer 29 are located on the outer side in the width direction than both end portions in the width direction of the reinforcing layer 28. The width direction indicates the width direction of the tire case 17 and the tire 10, and both ends in the width direction of the reinforcing layer 28 are the outermost coated cord members in the width direction of the coated cord members 26 that form the reinforcing layer 28. 26 shows an outer end portion in the width direction. In the present embodiment, the both end portions in the width direction of the covering layer 29 are positioned outside the both end portions in the width direction of the reinforcing layer 28. However, the present invention is not limited to this configuration, and the covering layer 29 width direction both ends and the width direction both ends of the reinforcing layer 28 may be the same position in the width direction. The covering layer 29 and the reinforcing layer 28 are joined together by welding the second covering thermoplastic material and the first covering thermoplastic material 27.

  Further, the outer peripheral surface of the covering layer 29 is flat, and a tread 30 made of a material having higher wear resistance than the thermoplastic material forming the tire case 17, such as rubber, is joined to the outer peripheral surface. ing. The inner peripheral surface of the tread 30 is shaped along the outer peripheral surface of the coating layer 29, and there is no gap between the two (a state in which no air enters). The rubber used for the tread 30 is preferably the same type of rubber as that used in conventional rubber pneumatic tires. Instead of the tread 30, a tread formed of another type of thermoplastic material that is more excellent in wear resistance than the thermoplastic material forming the tire case 17 may be used. Further, the tread 30 is formed with a tread pattern including a plurality of grooves on the ground contact surface with the road surface in the same manner as a conventional rubber pneumatic tire.

(Tire manufacturing equipment)
Next, the manufacturing apparatus of the tire 10 of this embodiment is demonstrated.
FIG. 3 is a perspective view showing a main part of the molding machine 32 used when forming the tire 10. The molding machine 32 includes a shaft 36 disposed horizontally, a geared motor 37 that rotates the shaft 36, and a pedestal 34 that is grounded to support the geared motor 37.

  A tire support portion 40 for supporting the tire case 17 is provided on the end portion side of the shaft 36. The tire support portion 40 includes a cylinder block 38 fixed to a shaft 36, and a plurality of cylinder rods 41 extending radially outward are provided at equal intervals in the circumferential direction.

  A tire support piece 42 having an arcuate curved surface 42A whose outer surface is set substantially equal to the radius of curvature of the tire case inner surface is provided at the tip of the cylinder rod 41. 3 and 4A show a state where the protruding amount of the cylinder rod 41 is the smallest, and FIG. 4B shows a state where the protruding amount of the cylinder rod 41 is the largest. Each cylinder rod 41 can project the same amount in the same direction in conjunction with each other.

  As shown in FIG. 5, when the tire case 17 is divided into a plurality of parts and formed in the vicinity of the molding machine 32, an extruder 44 that extrudes the thermoplastic material for welding used to integrate these divided bodies. (In the present embodiment, the tire case 17 is formed by welding and integrating the left and right case split bodies 17A). The extruder 44 has a nozzle 46 for discharging the molten thermoplastic material 53 for welding downward. The outlet portion of the nozzle 46 has a substantially rectangular shape, and discharges a belt-shaped welding thermoplastic material 53 having a substantially rectangular cross-sectional shape. The welding thermoplastic material 53 is preferably the same type as the thermoplastic material forming the tire case 17, particularly the same type, but may be of a different type as long as it can be welded. In the present embodiment, the thermoplastic material forming the tire case 17 and the welding thermoplastic material 53 are the same.

  Further, in the vicinity of the nozzle 46, a leveling roller 48 that presses and leveles the welding thermoplastic material 53 attached to the case division 17A of the tire case 17 and a cylinder that moves the leveling roller 48 in the vertical direction. A device 50 is arranged. The cylinder device 50 is supported on the support column 52 of the extruder 44 through a frame (not shown). The extruder 44 is movable in a direction parallel to the shaft 36 of the molding machine 32 along a guide rail 54 disposed on the floor surface.

  In the extruder 44, the nozzle 46 can be replaced with a nozzle 88. The nozzle 88 has a substantially rectangular shape whose outlet portion is wider than the nozzle 46, and is wider than the thermoplastic material 53 for welding by replacing the thermoplastic material for coating in the extruder 44. The second molten thermoplastic material 90 for coating can be discharged (see FIG. 9). The second covering thermoplastic material 90 covers the covering cord member 26 wound around the crown portion 16 in the covering cord member winding step described later, and the first covering thermoplastic material 27 of the covering cord member 26 is covered. And it welds with the thermoplastic material around the covering cord member 26. For this reason, the same kind as the first covering thermoplastic material 27 of the covering cord member 26, in particular, the same one is preferable, but a different kind may be used as long as it can be welded. In the following description, the second coating thermoplastic material without a symbol indicates a solidified state, and the second coating thermoplastic material 90 with a symbol indicates a molten or softened one.

  The guide rail 54 is movably mounted with a cord supply device 56 that supplies the coated cord member 26 for forming the reinforcing layer 28.

As shown in FIG. 8, the cord supply device 56 includes a reel 58 around which the coated cord member 26 is wound, a cord heating device 59 disposed on the downstream side of the reel 58 in the code transport direction, and a downstream in the transport direction of the coated cord member 26. A pressure roller 60 disposed on the side, a first cylinder device 62 that moves the pressure roller 60 in a direction of moving toward and away from the crown portion 16 of the tire case 17, and a downstream side in the conveyance direction of the reinforcing cord 26A of the pressure roller 60 And a second cylinder device 66 that moves the metal cooling roller 64 in a direction in which the metal cooling roller 64 comes in contact with and separates from the outer peripheral surface of the crown portion 16. In addition, the surfaces of the pressing roller 60 and the cooling roller 64 are coated with a fluororesin (in this embodiment, Teflon (registered trademark)) in order to suppress adhesion of a molten or softened thermoplastic material.
In the present embodiment, the cord supply device 56 has two rollers, that is, the pressing roller 60 and the cooling roller 64, but the present invention is not limited to this configuration, and only one of the rollers (that is, The structure which has 1 roller) may be sufficient. Further, the pressing roller 60 and the cooling roller 64 are driven to rotate with respect to the tire case 17.

The cord heating device 59 includes a heater 70 and a fan 72 that generate hot air, a heating box 74 through which the hot air is supplied to the internal space and the covering cord member 26 passes through the internal space, and a tip of the heating box 74. And a discharge port 76 through which the heated coated cord member 26 is discharged.
The cord supply device 56 is movable in the axial direction of the tire case 17.

  FIG. 6 shows a cord adhesive layer device 110 that forms an adhesive layer on the outer peripheral surface of the reinforcing cord 26A. The cord adhesive layer device 110 is fed from the reel 112 around which the reinforcing cord 26A is wound, the tension roller 114 that adjusts the tension of the reinforcing cord 26A sent out from the reel 112, and sends it to the downstream side in the transport direction, and the tension roller 114. The outer peripheral surface of the reinforcing cord 26A is adhered to the outer peripheral surface of the cleaned reinforcing cord 26A and a cleaning device 116 that cleans the outer peripheral surface of the reinforcing cord 26A with a liquid agent (in this embodiment, the reinforcing cord 26A is a steel cord and is preferably acid or alcohol). An adhesive layer forming device 118 that forms a layer, a drying device 120 that dries the adhesive layer of the reinforcing cord 26A with hot air, and a winding device 122 that winds up the reinforcing cord 26A sent from the drying device 120. Yes.

Further, as a method of forming the adhesive layer in the adhesive layer forming apparatus 118, the cleaned reinforcing cord 26A may be formed on the outer peripheral surface through the inside of the adhesive tank in which the adhesive is stored, and the outer periphery of the cleaned reinforcing cord 26A. It may be formed by spraying an adhesive on the surface, or other methods may be used.
As the adhesive, any adhesive may be used as long as the adhesive with the first covering thermoplastic material 27 covering the reinforcing cord 26A is good. For example, a triazine thiol-based adhesive is used. Is preferred.

  The first covering thermoplastic material 27 is preferably the same type as the thermoplastic material forming the tire case 17, in particular the same type, but may be of a different type as long as it can be welded. The first coating thermoplastic material 27 is preferably the same type as the second coating thermoplastic material 90 forming the coating layer 29, particularly the same, but different types as long as they can be welded (welded). It may be. Furthermore, the thermoplastic material forming the tire case 17, the first covering thermoplastic material 27 of the covering cord member 26, and the second covering thermoplastic material forming the covering layer 29 are the same kind. Is preferable from the viewpoint of bonding strength.

  Then, the reinforcing cord 26A is sent from the winding device 122 to the drum 132 and wound.

  FIG. 7 shows a cord coating apparatus 130 that coats and joins the first coating thermoplastic material 27 to the outer peripheral surface of the reinforcing cord 26A. The cord coating apparatus 130 includes a drum 132 around which a reinforcing cord 26A having an adhesive layer is wound, a tension roller 134 that adjusts the tension of the reinforcing cord 26A sent out from the drum 132, and sends the tension to the downstream side in the conveying direction. The outer surface of the reinforcing cord 26A sent from the roller 134 is coated with the melted or softened first coating thermoplastic material 27, and the coated cord member 26 extruded from the extruder 136 is in a molten state. 1 has a water tank 138 for cooling the coating thermoplastic material 27, and a winding device 140 that winds the coating cord member 26 coming out of the water tank 138.

  The extruder 136 has a resin charging port 142 at the top, and melts or softens the first coating thermoplastic material 27 charged from the resin charging port 142 to coat the reinforcing cord 26A passing through the inside. It is like that. The cord outlet 144 of the extruder 136 is substantially circular. For this reason, in this embodiment, the covering cord member 26 having a circular cross section is formed. The shape of the cord outlet portion 144 of the extruder 136 may be other than a substantially circular shape.

  Then, the covering cord member 26 is sent from the winding device 140 to the reel 58 and wound.

Next, the manufacturing method of the tire 10 of this embodiment is demonstrated.
(Tire case molding process)
(1) As shown in FIG. 3, first, two case division bodies 17A that face each other are disposed on the outer peripheral side of the tire support portion 40 with a reduced diameter, and the two case division bodies 17A Inside, a cylindrical tire inner surface support ring 43 made of a thin metal plate (for example, a steel plate having a thickness of 0.5 mm) is disposed (In FIG. 3, one case division 17A is removed to show the inside. Is described).

  The outer diameter of the tire inner surface support ring 43 is set to be approximately the same as the inner diameter of the outer peripheral portion of the case divided body 17A, and the outer peripheral surface of the tire inner surface support ring 43 is the inner peripheral surface of the outer peripheral portion of the case divided body 17A. It comes to adhere to. Thereby, generation | occurrence | production of the unevenness | corrugation (inverse shape of the said unevenness | corrugation) of the junction part (the thermoplastic material 53 for welding) resulting from the unevenness | corrugation produced in the outer periphery of the tire support part 40 by the clearance gap between the tire support pieces 42 can be suppressed. . Moreover, it is possible to suppress the occurrence of unevenness in the arrangement member (the tire case 17, the tread 30, and other tire constituent members (for example, a belt reinforcing layer)) due to the gap between the tire support pieces 42. That is, it is possible to suppress the occurrence of unevenness in a portion corresponding to the gap between the tire support pieces 42 of the arrangement member due to the force (tension, pressing force, etc.) applied when arranging the arrangement member. Since the tire inner surface support ring 43 is formed of a thin metal plate, the tire inner surface support ring 43 can be easily inserted into the case divided body 17A by being bent and deformed.

  Then, as shown in FIG. 4B, the diameter of the tire support portion 40 is enlarged and the tire inner surface support ring 43 is held from the inside by a plurality of tire support pieces 42.

(2) As shown in FIG. 5, the extruder 44 is moved, and the nozzle 46 is disposed above the abutting portion of the case divided body 17A. Then, while rotating the tire support portion 40 in the direction of the arrow R, the molten thermoplastic material 53 for welding is extruded from the nozzle 46 toward the joining portion, and the molten thermoplastic material 53 for welding is adhered along the joining portion. . The adhering thermoplastic material 53 for welding is leveled by the leveling roller 48 arranged on the downstream side, and is welded to the outer peripheral surfaces of both case division bodies 17A. The welding thermoplastic material 53 is gradually solidified by natural cooling, and the one case divided body 17A and the other case divided body 17A are welded by the welding thermoplastic material 53, and these members are integrated into the tire case 17 as a unit. Is formed.

(Coating cord member forming process)
(3) As shown in FIG. 6, first, an adhesive layer is formed on the outer peripheral surface of the reinforcing cord 26 </ b> A using the cord adhesive layer device 110. Specifically, the reinforcing cord 26A delivered from the reel 112 is sent to the cleaning device 116 while adjusting the tension with the tension roller 114, and the outer peripheral surface is cleaned. Next, an adhesive layer is formed on the outer peripheral surface of the cleaned reinforcing cord 26 </ b> A by the adhesive layer forming device 118. At this time, since the outer peripheral surface of the reinforcing cord 26A is cleaned, the adhesive layer is formed without unevenness. Then, the adhesive layer is dried with a drying device 120. The reinforcing cord 26 </ b> A having the adhesive layer formed in this manner is wound up by the winding device 122. Thereafter, the reinforcing cord 26 </ b> A is sent from the winding device 122 to the drum 132, and after the reinforcing cord 26 </ b> A is wound up by the drum 132, the drum 132 is set on the cord coating device 130.

(4) Next, as shown in FIG. 7, the first coating thermoplastic material 27 is coated and bonded to the outer peripheral surface of the reinforcing cord 26 </ b> A on which the adhesive layer is formed using the cord coating device 130. Specifically, the reinforcing cord 26 </ b> A sent out from the drum 132 is sent to the extruder 136 while adjusting the tension with the tension roller 134. In the extruder 136, the outer peripheral surface of the reinforcing cord 26 </ b> A is coated with the first coating thermoplastic material 27 that has been melted or softened, and the coated cord member 26 is pushed out from the cord outlet portion 144 to the water tank 138. As a result, the molten or softened first covering thermoplastic material 27 is cooled and solidified. When the first covering thermoplastic material 27 in the molten or softened state is coated on the reinforcing cord 26A, the reinforcing cord 26A and the first covering thermoplastic material 27 are joined via the adhesive layer. Here, since the adhesive layer is uniformly formed on the outer peripheral surface of the reinforcing cord 26A, adhesion between the reinforcing cord 26A and the first covering thermoplastic material 27 is improved. As a result, the bonding area (bonding force) between the reinforcing cord 26A and the first covering thermoplastic material 27 increases. Next, the covering cord member 26 is wound up by the winding device 140. Thereafter, the coated cord member 26 is sent from the winding device 140 to the reel 58, and after the coated cord member 26 is wound up by the reel 58, the reel 58 is set in the cord supply device 56.

(Coating cord member winding process)
(5) Next, as shown in FIG. 8, the extruder 44 is retracted and the cord supply device 56 is disposed in the vicinity of the tire support portion 40. Then, the temperature of the heater 70 is raised, and the ambient air heated by the heater 70 is sent to the heating box 74 by the wind generated by the rotation of the fan 72.

  Next, the coated cord member 26 unwound from the reel 58 set in the above process is fed into a heating box 74 whose internal space is heated with hot air (for example, the temperature of the outer peripheral surface of the coated cord member 26 is set to 100). To about 200 ° C.). Here, the covering cord member 26 is heated to be in a state where the first covering thermoplastic material 27 is melted or softened.

  The covering cord member 26 is spirally wound around the outer peripheral surface of the crown portion 16 of the tire case 17 that rotates in the direction of arrow R through the discharge port 76 with a certain tension. At this time, the melted or softened first covering thermoplastic material 27 in the portion in contact with the crown portion 16 spreads to the periphery, and the thermoplastic material in the contact portion and the first covering thermoplastic material 27 are mixed. They are welded together. Thereby, the joint strength between the crown portion 16 and the covering cord member 26 is improved.

  Further, the tension applied to the covering cord member 26 is adjusted by applying a brake to the reel 58 that is driven to rotate with respect to the tire case 17, and thus the covering cord is operated while applying a certain tension. By winding the member 26, the meandering of the covering cord member 26 can be suppressed. In this embodiment, the tension is adjusted by applying a brake to the reel 58, but the tension may be adjusted by providing a tension adjusting roller in the middle of the conveying path of the coated cord member 26.

  Further, the coated cord member 26 in which the first coating thermoplastic material 27 is melted or softened is pressed by the pressing roller 60 immediately after contacting the outer peripheral surface of the crown portion 16, thereby being melted or softened in the first state. The covering thermoplastic material 27 spreads well around the periphery, and a bonding area with the crown portion 16 can be secured. In addition, by pressing in this way, the air that has entered when the coated cord member 26 is brought into contact with the crown portion 16 is also pushed out, and air entering between the coated cord member 26 and the crown portion 16 is further suppressed. The

  Thereafter, the first covering thermoplastic material 27 in which the covering cord member 26 is melted or softened is forcibly cooled by the cooling roller 64 provided on the downstream side of the pressing roller 60. As a result, the covering cord member 26 and its surroundings are cooled before the covering cord member 26 moves, so that the covering cord member 26 can be disposed with high accuracy.

  In this way, the reinforcing cord 28 is formed on the outer peripheral side of the crown portion 16 of the tire case 17 by winding the covering cord member 26 around the crown portion 16 in a spiral manner.

(Coating cord member coating process)
(6) Next, as shown in FIG. 9, the cord supply device 56 is retracted, and the extruder 44 is again disposed in the vicinity of the tire support portion 40. At this time, the nozzle 46 of the extruder 44 is replaced with the nozzle 88 and the material discharged from the nozzle 88 is replaced with the second thermoplastic material 90 for coating.

  Next, the nozzle 88 is disposed above the end in the width direction of the region wider than the winding region of the covering cord member 26 wound around the crown portion 16 (the region where the reinforcing layer 28 is disposed).

  Then, while rotating the tire support portion 40 in the direction of the arrow R, the second covering thermoplastic material 90 melted or softened from the nozzle 88 is discharged toward the covering region of the crown portion 16, and the second covering thermoplastic material 90 is discharged along the circumferential direction. Two coating thermoplastic materials 90 are deposited. In this manner, the covering cord member 26 is covered with the second covering thermoplastic material 90. At this time, since the second covering thermoplastic material 90 in a molten or softened state spreads to some extent on the surface of the wound covering cord member 26, a gap between the adjacent covering cord members 26 becomes a second covering heat member. It is filled with the plastic material 90, and the surface approaches a flat shape.

  The covering amount when covering the coated cord member 26 wound with the melted or softened second coating thermoplastic material 90 is such that the surface (the entire surface) of the second coating thermoplastic material 90 is the coated cord. The member 26 is adjusted to be radially outward from the radially outer end of the tire case 17 of the member 26. By adjusting in this way, the surface of the second covering thermoplastic material 90 becomes flatter.

  The attached second coating thermoplastic material 90 is pressed and leveled by the leveling roller 48 disposed on the downstream side, and the second coating thermoplastic material 90 becomes the first coating thermoplastic material. Weld with material 27. Thereby, it is suppressed that the 2nd thermoplastic resin material 90 for covering is lifted from the coating cord member 26 wound. Further, air between the covering cord member 26 and the second covering thermoplastic material 90 is also pushed out when pressed by the leveling roller 48, and the air around the covering cord member 26 is effectively suppressed. Then, after the first covering thermoplastic material 90 is solidified by natural cooling, a covering layer 29 that covers the reinforcing layer 28 is formed.

  As shown in FIG. 10, when the second covering thermoplastic material 90 is attached to the covering region of the crown portion 16, the end portions in the width direction of the tire case 17 may be slightly overlapped.

  In addition, although it is set as the structure which uses the extruder 44 used at the tire case shaping | molding process in this process, this invention is not restricted to this structure, You may manufacture and use the extruder only for this process. However, by exchanging a part of the parts of the extruder 44 used in the tire case molding process, the cost can be reduced as compared with manufacturing a new extruder.

(Surface treatment process)
(7) Next, the extruder 44 is retracted, and a buff processor (not shown) is disposed in the vicinity of the tire support portion 40. Then, a tread joint surface (including the outer peripheral surface of the coating layer 29) to which a tread 30 (detailed later) of the tire case 17 on which the coating layer 29 is formed is joined while rotating the tire support portion 40 in the arrow R direction. Surface treatment is performed to form fine irregularities (including grooves) on the surface while trimming so that the circumferential direction and the width direction are uniform, and adjusting the outer shape. The fine irregularities cause an anchor effect when the tread 30 is bonded to the tread bonding surface with an adhesive in a later step. That is, in the present embodiment, fine irregularities are formed on the tread joint surface, but the present invention is not limited to this, and any material may be formed on the tread joint surface as long as an anchor effect can be generated.

  Further, the covering layer 29 is a second covering thermoplastic material such that the surface (all surfaces) of the covering thermoplastic material 90 is radially outside the radially outer end portion of the tire case 17 of the covering cord member 26. The reinforcing cord 26 </ b> A is difficult to be cut off during the surface treatment because the thickness of the covering layer 29 and the covering cord member 26 is ensured.

(8) Next, the vulcanized belt-like tread 30 is wound around the tread joint surface of the tire case 17 for one turn, and the tread 30 is joined to the tread joint surface using an adhesive or the like. Since the inner peripheral surface of the tread 30 is flat like the outer peripheral surface of the coating layer 29, there is a gap between the tread joint surface including the outer peripheral surface of the coating layer 29 and the inner peripheral surface of the tread 30. It is hard to occur and the air is suppressed. Further, in the surface treatment process, since the tread joint surface is formed with fine irregularities, the adhesive enters the fine irregularities, and an anchor effect is produced to form the tread 30 and the coating layer 29. The bonding strength with 17 is improved.

  The adhesive is not particularly limited, such as a triazine thiol adhesive, a chlorinated rubber adhesive, a phenol resin adhesive, an isocyanate adhesive, or a halogenated rubber adhesive. Moreover, the tread 30 can use the precure tread used for the retread tire conventionally known, for example. This step is the same step as the step of bonding the precure tread to the outer peripheral surface of the base tire of the retreaded tire.

(9) When the seal layer 24 made of vulcanized rubber is bonded to the bead portion 12 of the tire case 17 using an adhesive or the like, the tire 10 is completed.

(10) Finally, the diameter of the tire support portion 40 is reduced, the completed tire 10 is removed from the tire support portion 40, the inner tire inner surface support ring 43 is bent and deformed, and is removed from the tire.

(Function)
In the tire 10 of the present embodiment, the covering cord member 26 is wound around the crown portion 16 of the tire case 17 formed of a thermoplastic material to form the reinforcing layer 28, and therefore, puncture resistance, cut resistance, and The circumferential rigidity of the tire 10 is improved. In addition, the creep of the tire case 17 formed of a thermoplastic material is prevented by improving the circumferential rigidity of the tire 10.

  Further, since the reinforcing cord 26A of the covering cord member 26 is covered with the first covering thermoplastic material 27, the air around the reinforcing cord 26A is suppressed and the movement of the reinforcing cord 26A is suppressed. The Further, since the covering cord member 26 is joined to the crown portion 16 by welding, it is possible to suppress the movement of the covering cord member 26 (including the reinforcing cord 26A) due to input during traveling and the like, thereby improving durability.

  On the other hand, since the reinforcing cord 26A is covered with the first covering thermoplastic material 27 and the surrounding air is suppressed, the weight of the reinforcing cord 26A is increased when compared with the case where the reinforcing cord 26A is embedded in a cushion rubber or the like. A decrease in running performance such as an increase in the physical property change width of the member in the thickness direction and a lack of lateral force during running is suppressed.

  Further, since the reinforcing cord 26A and the first covering thermoplastic material 27 are joined by an adhesive, the adhesion between the reinforcing cord 26A and the first covering thermoplastic material 27 is improved, and the reinforcing cord Intrusion around 26A is further suppressed. Further, the joining of the reinforcing cord 26A and the first covering thermoplastic material 27 further suppresses the movement of the reinforcing cord 26A, thereby suppressing the deterioration (such as the occurrence of cracks) of the first covering thermoplastic material 27. Is done.

  And since the thermoplastic material of the crown part 16 and the covering cord member 26 are joined by welding, the joining strength between the crown part 16 and the covering cord member 26 is improved.

  Further, when the thermoplastic material forming the tire case 17 and the first covering thermoplastic material 27 of the covering cord member 26 are the same type, the thermoplastic material and the first covering thermoplastic material 27 are welded. The thermoplastic material and the first covering thermoplastic material mix well, and the bonding strength between the crown portion 16 and the covering cord member 26 is improved.

  Further, a gap generated between the adjacent coated cord members 26 is covered with a coating layer 29 having a flat outer peripheral surface. Thereby, it is hard to produce a clearance gap between the tread 30 joined to the tread joint surface of the tire case 17 including the coating layer 29, and the air is suppressed. As a result, a bonding area (bonding force) between the tread 30 and the coating layer 29 is ensured, and peeling between the tread 30 and the coating layer 29 is suppressed by an input during traveling and the durability is improved.

  When the first covering thermoplastic material 27 of the covering cord member 26 and the second covering thermoplastic material 27 of the covering layer 29 are of the same type, the second covering thermoplastic material 90 is reinforced by being melted or softened. Since the covering layer is formed so as to cover the layer 28, the covering thermoplastic material 27 and the second covering thermoplastic material 90 are well mixed, and the covering cord member 26 and the covering layer 29 are mixed. And the bonding strength is improved.

In addition, since the tread 30 that is in contact with the road surface is made of a rubber material that is more excellent in wear resistance than the thermoplastic material, the wear resistance of the tire 10 is improved.
Further, since an annular bead core 18 made of a metal material is embedded in the bead portion 12, the tire case 17, that is, the tire 10 is strong against the rim 20 like the conventional rubber pneumatic tire. Retained.

  Furthermore, since a seal layer 24 made of a rubber material having better sealing performance than a thermoplastic material is provided at a portion of the bead portion 12 that comes into contact with the rim 20, a seal between the tire 10 and the rim 20 is provided. Improves. For this reason, the air leak in a tire is further suppressed compared with the case where it seals with the rim | limb 20 and a thermoplastic material. Further, the rim fit property is improved by providing the seal layer 24.

[Other embodiments]
In the first embodiment, the covering cord member 26 is heated to melt or soften the first covering thermoplastic material 27, and the covering cord member 26 and the crown portion 16 are joined by welding. However, the covering cord member 26 is not heated, and the portion of the crown portion 16 where the covering cord member 26 is embedded is heated to melt or soften the thermoplastic material, and then the covering cord member 26 is moved to the crown portion. It is good also as a structure which embeds in 16 and joins both. More specifically, as shown in FIG. 12, a hot air generator 78 having a fan 82, a heater 80, and a discharge port 84 is used, and the hot air generated by the hot air generator 78 is applied to the covering cord member 26 of the crown portion 16. The coated cord member 26 is buried after the thermoplastic material is melted or softened by spraying on the portion to be buried, and the coated cord member 26 and the crown portion 16 are bonded together. As a result, the tire 10 having a cross-section as shown in FIG. 11 around the covering cord member 26 is manufactured.
Further, the coated cord member 26 is heated using the cord heating device 59 shown in FIG. 8 to bring the first coating thermoplastic material 27 into a molten or softened state, and the hot air generating device 78 shown in FIG. 12 is used. The portion of the crown portion 16 where the covering cord member 26 is embedded may be heated to bring the thermoplastic material into a molten or softened state, and then contact the two to join them. In this case, since the thermoplastic material and the first covering thermoplastic material 27 are mixed well compared with the case where one of the two is melted or softened, the crown portion 16 and the covering cord member 26 This further improves the bonding strength. In addition, the heating of the portion of the crown portion 16 where the covering cord member 26 is embedded is not limited to heating with hot air of the hot air generator 78, but may be performed by various methods such as heating by radiant heat, infrared heating, heating by pressing a heating roller, etc. Can be used.

  In the above-described embodiment, the covering cord member 26 and the crown portion 16 are joined by welding. However, the present invention is not limited to this, and an adhesive is applied (or sprayed) to the outer peripheral surface of the covering cord member 26. The covering cord member 26 and the crown portion 16 may be joined with this adhesive. In the case of joining with an adhesive in this way, even if the thermoplastic material forming the tire case 17 and the first covering thermoplastic material 27 are difficult to weld together, the covering cord member 26 and the crown The part 16 can be joined. In this way, when the covering cord member 26 is bonded to the crown portion 16 using an adhesive, an adhesive layer is formed between the two.

  In the above-described embodiment, the covering cord member 26 having the circular cross section is formed in the covering cord forming step. However, the present invention is not limited to this configuration, and the covering cord member 26 is not cross-sectionally viewed from the crown portion 16. The joining side may be a flat surface 26D, the opposite side to the joining side to the crown portion 16 may be a flat surface 26U, and the joining side to the crown portion 16 may be wider than the opposite side (here, the flat surface The flat surface 26D is wider than 26U). An example of such a cross-sectional shape is a substantially trapezoid (see FIG. 13). Here, when the covering cord member 26 having the trapezoidal cross section is formed in the covering cord forming step, the meandering of the covering cord member 26 is suppressed when the covering cord member 26 is wound around the crown portion 16, and the covering cord member 26. Is arranged with high accuracy. In addition, a gap is hardly generated between the crown portion 16 and the covering cord member 26, and a bonding area is effectively ensured. Furthermore, since the flat surface 26D is wider than the flat surface 26U, a sufficient bonding area (bonding force) between the crown portion 16 and the covering cord member 26 can be secured. Further, when a tire constituent member such as a tread is joined on the flat surface 26D, a gap is hardly generated between the flat surface 26U and the tire constituent member, and a sufficient joining area is secured. When the covering layer 29 is formed on the reinforcing layer 28 formed by the covering cord member 26, the molten or softened second covering thermoplastic material 90 on the flat surface 26U is easy to spread, and the surface is easy to spread. It tends to be flat. Further, the covering cord member 26 having a trapezoidal cross section may be joined to the crown portion 16 by welding by heating the flat surface 26D so that the first covering thermoplastic material 27 on the flat surface 26D side is melted or softened. . In addition, the coated cord member 26 having a trapezoidal cross section can be coated (or sprayed) with an adhesive on the flat surface 26D, and the flat surface 26D can be bonded to the crown portion 16 with an adhesive.

  In the above-described embodiment, the adhesive layer is formed on the outer peripheral surface of the reinforcing cord 26A by the cord adhesive layer device 110. However, the present invention is not limited to this, and the reinforcing cord 26A is washed by performing alkaline degreasing, Reinforcement cord using a device that is placed in an acid activation bath and cleaned, then cleaned by electrolytic treatment or dipping treatment with an adhesive layer containing adhesive, and then washed with hot water and dried with hot air It is good also as a structure which forms an adhesive layer in the outer peripheral surface of 26A.

  Further, in the above-described embodiment, the second coating thermoplastic material 90 melted or softened from the extruder 44 is extruded to cover the coating region with the second coating thermoplastic material 90. As shown in FIG. 14, the welding sheet 92 formed of the same material as the second covering thermoplastic material 90 is heated (heated air, radiant heat, infrared rays, a heating roller, etc.) as shown in FIG. However, it may be arranged in the covering region and leveled by the leveling roller 96 pressed downward by the cylinder device 94. When the welding sheet 92 is used, it is preferable to heat the adhesion surface of the welding sheet 92 to the crown portion 16 to a molten or softened state. Further, the welding sheet 92 may be disposed while heating and melting or softening the portion of the crown portion 16 where the welding sheet 92 is disposed. Furthermore, the welding sheet 92 may be disposed by heating and melting or softening the welding sheet 92 and heating and melting or softening the portion of the crown portion 16 where the welding sheet 92 is disposed. In this case, the melted or softened welding sheet 92 and the first coating thermoplastic material 27 of the coating cord member 26 are mixed and welded, cooled and solidified, and then the coating layer 29 formed by the welding sheet 92. And the bonding strength (welding strength) between the crown portion 16 are improved. In FIG. 14, the outlet 100 of the hot air generating device 98 is directed toward the adhesive surface of the welding sheet 92, and the adhesive surface is melted or softened by the generated hot air and disposed in the covering region of the crown portion 16. .

  Further, in the above-described embodiment, the covering cord member 26 is covered with the second covering thermoplastic material 90 which is melted or softened after the covering cord member 26 is wound around the crown portion 16 to form the reinforcing layer 28. However, the present invention is not limited to this, and the embedded covering cord member 26 is covered with the second covering thermoplastic material 90 melted or softened while the covering cord member 26 is embedded in the crown portion 16. Also good.

  Further, in the above-described embodiment, the covering cord member 26 is wound around the crown portion 16 and the joining is performed by welding or the adhesive (adhesion). However, the present invention is not limited to this configuration, and the crown portion A configuration may be adopted in which a spiral groove is previously formed in 16 and the covering cord member 26 is fitted into the groove. With this configuration, when the covering cord member 26 is wound around the crown portion 16, the covering cord member 26 is disposed with high accuracy without meandering. In addition, after the covering cord member 26 is fitted into the groove, the periphery of the covering cord member 26 may be heated to join the covering cord member 26 and the crown portion 16 by welding. The covering cord member 26 and the crown portion 16 may be joined by being fitted into the groove and welded. The coated cord member 26 coated with an adhesive may be fitted into the groove to join the coated cord member 26 and the crown portion 16.

  In the above-described embodiment, the coating thermoplastic material 90 that has been melted or softened is attached to the winding region of the crown portion 16, and then the coating thermoplastic material 90 is naturally cooled. Not limited to this, the coating thermoplastic material 90 may be forcibly cooled. As the means for forcibly cooling, means for directly cooling the molten or softened thermoplastic material for coating 90 by using cold air or using a water-cooled cooling roller can be used. Further, the leveling roller 48 may be the cooling roller.

  In the above-described embodiment, the tire case 17 is formed by joining the case divided bodies 17A. However, the present invention is not limited to this configuration, and the tire case 17 is integrally formed using a mold or the like. May be.

  The tire 10 of the above-described embodiment is a so-called tubeless tire in which an air chamber is formed between the tire 10 and the rim 20 by attaching the bead portion 12 to the rim 20, but the present invention is limited to this configuration. Instead, the tire 10 may have a complete tube shape as shown in FIG. Incidentally, the complete tube-shaped tire shown in FIG. 15 is also assembled with a rim in the same manner as the tubeless tire shown in FIG.

  In the above-described embodiment, the covering cord member 26 is spirally wound around the outer peripheral surface of the crown portion 16, but the present invention is not limited thereto, and the covering cord member 26 is discontinuous in the width direction. It is good also as a structure wound so that it may become.

  Furthermore, in the above-described embodiment, the tread 30 is provided on the outer peripheral surface of the coating layer 29. However, the present invention is not limited to this configuration, and another tire constituent member may be provided on the outer peripheral surface of the coating layer 29. For example, the coating cord member 26 in which the first coating thermoplastic material 27 is melted or softened is wound around the outer peripheral surface of the coating layer 29, and then covered with the molten or softened coating thermoplastic material to cover the coating layer. It is good also as a structure which forms and laminates | stacks a tire structural member on the tire case 17. FIG.

Furthermore, the order for manufacturing the tire 10 is not limited to the order of the first embodiment, and may be changed as appropriate.
The embodiments of the present invention have been described above with reference to the embodiments. However, these embodiments are merely examples, and various modifications can be made without departing from the scope of the invention. Further, it goes without saying that the scope of rights of the present invention is not limited to these embodiments.

10 tire 12 bead portion 16 crown portion (outer peripheral portion)
17 Tire case (tire frame member)
26 Coated Cord Member 26A Reinforcing Cord 27 First Covering Thermoplastic Material 28 Reinforcing Layer 29 Covering Layer 30 Tread 90 Second Coating Thermoplastic Material

Claims (19)

An annular tire frame member formed of a thermoplastic material;
A reinforcing layer formed by winding and bonding a covering cord member formed by covering a reinforcing cord with a first covering thermoplastic material around the outer periphery of the tire frame member;
Tire with.   The tire according to claim 1, wherein the reinforcing cord and the first covering thermoplastic material are joined by an adhesive.   The tire according to claim 1 or 2, wherein the outer peripheral portion and the covering cord member are joined by welding.   The tire according to claim 3, wherein the thermoplastic material and the first thermoplastic resin material for coating are the same type.   The tire according to claim 1 or 2, wherein the outer peripheral portion and the covering cord member are joined together by an adhesive.   The tire according to any one of claims 1 to 5, wherein the covering cord member is wider on the side joined to the outer peripheral portion than on the opposite side.   The tire according to any one of claims 1 to 6, wherein the covering cord member has a flat surface on a side joined to the outer peripheral portion.   The tire according to any one of claims 1 to 7, wherein the coated cord member has a flat surface on the opposite side to the outer peripheral portion.   9. The coating material according to claim 1, further comprising a coating layer formed of a second coating thermoplastic material and bonded to the outer peripheral portion so as to cover the reinforcing layer and have a flat outer peripheral surface. Tires.   The tire according to claim 9, wherein the first covering thermoplastic material and the second covering thermoplastic material are the same type. A coated cord member forming step of coating the reinforcing cord with the first coating thermoplastic material to form a coated cord member;
A covering cord member winding step of winding and covering the covering cord member around an outer peripheral portion of an annular tire frame member formed of a thermoplastic material;
The manufacturing method of the tire which has this.   In the covering cord member forming step, an adhesive layer is formed on the outer peripheral surface of the reinforcing cord, and the first covering thermoplastic material melted or softened on the reinforcing cord is covered and bonded via the adhesive layer. Item 12. A method for manufacturing a tire according to Item 11.   The tire manufacturing method according to claim 12, wherein in the covering cord member forming step, the reinforcing cord is washed before forming the adhesive layer.   In the covering cord member winding step, at least one of the first covering thermoplastic material of the covering cord member and the thermoplastic material of the crown portion of the portion to which the covering cord member is joined is melted or The tire manufacturing method according to any one of claims 11 to 13, wherein the crown portion and the coated cord member are joined by welding in a softened state.   The method for manufacturing a tire according to any one of claims 11 to 13, wherein in the covering cord member winding step, the outer peripheral portion and the covering cord member are joined together with an adhesive.   The tire manufacturing method according to any one of claims 11 to 15, wherein, in the covering cord member forming step, the covering cord member is formed such that a side joined to the outer peripheral portion is wider than a reverse side.   The tire manufacturing method according to any one of claims 11 to 16, wherein, in the covering cord member forming step, the covering cord member having a flat surface on a side joined to the outer peripheral portion is formed.   The tire manufacturing method according to any one of claims 11 to 17, wherein, in the covering cord member forming step, the covering cord member is formed such that a side opposite to a side joined to the outer peripheral portion is a flat surface.   The tire manufacturing according to any one of claims 11 to 18, further comprising a covering cord member covering step of covering the covering cord member embedded in the outer peripheral portion with a second covering thermoplastic material melted or softened. Method.

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