JP5474445B2 - Tire manufacturing method and tire manufacturing mold - Google Patents

Description

  The present invention relates to a tire manufacturing method and a tire manufacturing mold, and more specifically, to a tire manufacturing method in which a molten thermoplastic material is injected into a mold to form a tire frame member, and to such a tire manufacturing method. The present invention relates to an applicable tire manufacturing mold.

  Conventionally, a tire formed of rubber, an organic fiber material, and a steel member is known. In recent years, it has been required to use a thermoplastic material such as a thermoplastic elastomer (TPE) or a thermoplastic resin as a tire material from the viewpoint of weight reduction and ease of recycling. For example, Patent Document 1 describes a pneumatic tire including a tire body made of a polymer material and a tread body integrated with the tire body by vulcanization in a vulcanization mold.

JP-A-1-257606

  By the way, as described in Patent Document 1, the tire body (tire frame member) is made of a material having thermoplasticity. Therefore, it is desirable to reduce the heat supply to such a material having thermoplasticity in consideration of effects such as shrinkage and deformation of the tire frame member.

  In consideration of the above facts, the present invention provides a tire manufacturing method capable of reducing the influence of heat supply to the tire frame member when the tread rubber is bonded to the tire frame member including the thermoplastic material, and the tire. It is an object to obtain a tire manufacturing mold applicable to a manufacturing method.

In the first aspect of the present invention, a tread rubber constituting a tire tread is disposed from the tire outer peripheral side in a tire frame member configured to include a thermoplastic material, and the tire tread rubber is further disposed on the tire outer peripheral side than the tread rubber. A clamping step of arranging a clamping member, clamping the tread rubber and the tire skeleton member from the opposite side of the outer clamping member with the tread rubber and the tire skeleton member sandwiched between the inner clamping member, and at least the tire skeleton member A tire frame member that heats the tread rubber by reducing the amount of heat supplied from the inner clamping member to the tread rubber non-arranged portion where no tread rubber is arranged, than the amount of heat supplied from the outer clamping member to the tread rubber. anda heating step of bonding, in the heating step, by blocking the heat supply to said clamping member, provided The amount of heat to less than the supply heat quantity of the outer clamping member.

  In this tire manufacturing method, first, in the clamping step, a tread rubber constituting a tire tread is disposed on a tire skeleton member including a thermoplastic material from the tire outer peripheral side. And an outer clamping member is arrange | positioned further to a tire outer peripheral side rather than tread rubber. Further, the tread rubber and the tire frame member are clamped by the inner clamping member (between the outer clamping member) on the side opposite to the outer clamping member across the tread rubber and the tire frame member.

Next, in the heating step, the tread rubber is heated and bonded to the tire frame member. At this time, the amount of heat supplied from the inner clamping member to at least the portion where the tread rubber is not disposed is made smaller than the amount of heat supplied from the outer clamping member to the tread rubber. Therefore, in the tire frame member configured to include the thermoplastic material, at least the portion where the tread rubber is not disposed has less influence on the heat supply. In addition, the heat supply from the inner sandwiching member to the tread rubber non-arranged portion can be reduced by cutting off the heat supply to the inner sandwiching member and making the amount of heat supplied to the inner sandwiching member smaller than the amount of heat supplied to the outer sandwiching member. It can be lost.

In the invention according to claim 2, a tread rubber constituting a tread of a tire is disposed on a tire frame member including a thermoplastic material in a state before vulcanization is completed from the tire outer periphery side. Further, an outer clamping member is disposed on the outer peripheral side of the tire, and a clamping step of clamping the tread rubber and the tire frame member with the inner clamping member from the side opposite to the outer clamping member with the tread rubber and the tire frame member interposed therebetween, The amount of heat supplied from the inner clamping member to a portion where the tread rubber is not disposed in the tire frame member is less than the amount of heat supplied from the outer clamping member to the tread rubber. has a vulcanized adhesion step of vulcanization bonded to tire frame member by heating the rubber, in the heating step, the heat provided to said clamping member By blocking, to less than the supply heat quantity of the outer clamping member to supply heat.

  In this tire manufacturing method, first, in the clamping step, a tread rubber constituting a tire tread is disposed on a tire skeleton member including a thermoplastic material from the tire outer peripheral side. At this stage, the tread rubber is in a state before vulcanization is completed (unvulcanized or semi-vulcanized) and can be bonded (vulcanized and bonded) to the tire frame member by vulcanization. The semi-vulcanized state means a state in which the degree of vulcanization is higher than that in the unvulcanized state, but the degree of vulcanization required for the final product has not been reached. And an outer clamping member is arrange | positioned further to a tire outer peripheral side rather than tread rubber. Further, the tread rubber and the tire frame member are clamped by the inner clamping member (between the outer clamping member) on the side opposite to the outer clamping member across the tread rubber and the tire frame member.

Next, in the vulcanization bonding step, the tread rubber is heated and vulcanized and bonded to the tire frame member. At this time, the amount of heat supplied from the inner clamping member to at least the portion where the tread rubber is not disposed is made smaller than the amount of heat supplied from the outer clamping member to the tread rubber. Therefore, in the tire frame member configured to include the thermoplastic material, at least the portion where the tread rubber is not disposed has less influence on the heat supply. In addition, the heat supply from the inner sandwiching member to the tread rubber non-arranged portion can be reduced by cutting off the heat supply to the inner sandwiching member and making the amount of heat supplied to the inner sandwiching member smaller than the amount of heat supplied to the outer sandwiching member. It can be lost.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the heating step is performed using the inner clamping member that is not in contact with the tread rubber non-arranged portion.

  Thus, the heat supply from the inner clamping member to the tread rubber non-arranged portion can be suppressed by using the inner clamping member that is not in contact with the tread rubber non-arranged portion.

  In the invention according to claim 4, in the invention according to any one of claims 1 to 3, in the heating step, the temperature of the inner holding member is made lower than the temperature of the outer holding member.

  Thus, by making the temperature of the inner clamping member lower than the temperature of the outer clamping member, it is possible to suppress the heat supply from the inner clamping member even to the tread rubber non-arranged portion.

In the invention according to claim 5 , the sandwiching step and the heating step are performed in a state where an adhesive for adhering them is disposed between the tire frame member and the tread rubber.

  By arranging an adhesive between the tire frame member and the tread rubber, it becomes possible to firmly bond them.

According to a sixth aspect of the present invention, there is provided a tire manufacturing mold used in the tire manufacturing method according to the third aspect, wherein the outer clamping member is disposed closer to the tire outer periphery than the tread rubber, and the tread rubber. And an inner clamping member that sandwiches the tread rubber and the tire frame member from the side opposite to the outer clamping member with the tire frame member interposed therebetween and is not in contact with the tread rubber non-arranged portion.

  In this tire manufacturing mold, the inner clamping member is not in contact with the tread rubber non-arranged portion. Therefore, when the tread rubber and the tire frame member are sandwiched between the outer sandwiching member and the inner sandwiching member and heated (including vulcanization adhesion), heat supply to the tread rubber non-arranged portion can be suppressed.

  In addition, the “mold for tire manufacture” in the present invention is not limited to one made of metal, and may be made of other materials.

  Since the present invention has the above-described configuration, it is possible to reduce the influence of heat supply to the tire frame member when the tread rubber is bonded to the tire frame member configured to include the thermoplastic material.

It is a schematic structure figure showing the tire manufactured by the tire manufacturing method of the present invention. It is sectional drawing which shows the vicinity of the bead part of the tire manufactured by the tire manufacturing method of this invention in the attachment state to a rim | limb. It is sectional drawing which shows the metal mold | die for tire manufacture applied to the tire manufacturing method of 1st Embodiment of this invention in a tire radial direction cross section with a tire frame member and tread rubber. It is explanatory drawing which shows the metal mold | die for tire manufacture applied to the tire manufacturing method of 1st Embodiment of this invention with a tire frame member and tread rubber. It is sectional drawing which shows the metal mold | die for tire manufacture applied to the tire manufacturing method of 2nd Embodiment of this invention in the cross section of a tire radial direction with a tire frame member and tread rubber. It is explanatory drawing which shows the metal mold | die for tire manufacture applied to the tire manufacturing method of 2nd Embodiment of this invention with a tire frame member and tread rubber. It is sectional drawing which shows the metal mold | die for tire manufacture applied to the tire manufacturing method of 3rd Embodiment of this invention in a tire radial direction cross section with a tire frame member and tread rubber. It is explanatory drawing which shows the metal mold | die for tire manufacture applied to the tire manufacturing method of 3rd Embodiment of this invention with a tire frame member and tread rubber. It is sectional drawing which shows the metal mold | die for tire manufacture applied to the tire manufacturing method of 4th Embodiment of this invention in a tire radial direction cross section with a tire frame member and tread rubber. It is explanatory drawing which shows the metal mold | die for tire manufacture applied to the tire manufacturing method of 4th Embodiment of this invention with a tire frame member and tread rubber. It is a schematic sectional drawing which shows the tire of the structure different from FIG. 1 manufactured by the tire manufacturing method of this invention. It is sectional drawing shown in the state which divided | segmented the tire shown in FIG. 11 with the tire half body. It is a schematic sectional drawing which shows the tire of the structure different from FIG.1 and FIG.12 manufactured with the tire manufacturing method of this invention. It is sectional drawing shown in the state which divided | segmented the tire shown in FIG. 13 with the tire half body.

  FIG. 3 shows a tire manufacturing mold 52 according to the first embodiment of the present invention. FIG. 4 schematically shows some steps of the tire manufacturing method using the tire manufacturing mold 52. As shown in FIGS. 1 and 2, the tire 12 manufactured by the tire manufacturing method of the present embodiment is a tire that extends outward in the tire radial direction from the tire bead portion 22 in which the bead core 20 is embedded and is in contact with the rim 18. The tire center (crown part 26) which connects the tire side parts 24 through the side parts 24 is provided, and these are provided with the tire frame member 14 made of a thermoplastic material. Then, the tread rubber 16 is adhered to the position on the tire outer peripheral surface side of the tire frame member 14, that is, the outer side of the crown portion 26, whereby the tire 12 to be mounted on the rim 18 of the vehicle is obtained.

  In addition, although it is possible to use a resin-made tread member instead of the tread rubber 16 as long as it is possible to achieve an action required as a tire tread, in the first embodiment and the second embodiment of the present invention, As will be described later, an unvulcanized (or semi-vulcanized) tread rubber 16 is used in the production stage, and this is vulcanized and bonded to the crown portion 26 of the tire frame member 14 in the vulcanization bonding process (heating process). Thus, the tire manufacturing method according to the first embodiment and the second embodiment is applied when the tire 12 is manufactured by vulcanizing and bonding the tread rubber 16 to the tire frame member 14 as described above. That is, in the tire frame member 14, a portion (substantially crown portion 26) where the tread rubber 16 is disposed and in contact is a tread rubber disposed portion 14 </ b> S, and a portion where the tread rubber 16 is not disposed (other than the crown portion 26). Is a tread rubber non-arranged portion 14N. In other words, when a normal line is drawn on the tire frame member 14 at a portion where the tread rubber 16 is disposed, a portion where the normal line penetrates the tire frame member 14 (a portion extending from the outside to the inside of the tire frame member 14). ) Is a tread rubber arrangement portion 14S.

  Here, the tire frame member 14 of the present embodiment is formed of a single thermoplastic material, but the present invention is not limited to this configuration, and the tire is similar to a conventional rubber pneumatic tire. You may use the thermoplastic material which has a different characteristic for every site | part (the tire side part 24, the crown part 26, the tire bead part 22 etc.) of the frame member 14. FIG.

  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). Particularly, TPV partially kneaded with rubber-based resin is preferable.

  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, Tensile yield elongation specified in JIS K7113 is 10% or more, Tensile breaking elongation (JIS K7113) specified in JIS K7113 is 50% or more, Vicat softening temperature (Method A) specified in JIS K7206 is 130 ° C or more Is used.

  An annular bead core 20 made of steel cord is embedded in the tire bead portion 22 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 20 may be omitted if the rigidity of the tire bead portion 22 is ensured and there is no problem in fitting with the rim. The bead core 20 is not limited to a metal cord such as a steel cord. The bead core 20 is formed of an organic fiber alone, an organic fiber coated with a resin (organic fiber cord), or a hard resin. Resin cords may be used.

  Further, as shown in FIG. 2, in the present embodiment, the thermoplastic material forming the tire frame member 14 is formed on the contact portion of the tire bead portion 22 with the rim 18 and at least the portion of the rim 18 that contacts the rim flange 18F. In addition, an annular sealing layer 28 made of a material excellent in sealing properties, for example, rubber or resin is formed. This seal layer 28 may also be formed in a portion that contacts the bead sheet 30.

  As the rubber forming the sealing layer 28, 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. If the sealing property between the rim 18 can be ensured only with the thermoplastic material, the rubber sealing layer 28 may be omitted, and the sealing property is superior to the thermoplastic material forming the tire frame member 14. Any type of thermoplastic material may be used.

  As shown in FIG. 1, the crown portion 26 has a reinforcing cord 34 having a rigidity higher than that of the thermoplastic material forming the tire frame member 14, at least partially in a sectional view along the axial direction of the tire frame member 14. The reinforcing cord layer 32 is formed by being spirally wound in a state where the wire is embedded. Further, the reinforcing cord 34 is in a state where the embedded portion is in close contact with the thermoplastic material. As the reinforcing cord 34, a monofilament (single wire) such as a metal fiber or an organic fiber, or a multifilament (stranded wire) obtained by twisting these fibers may be used. In this embodiment, a steel cord twisted with steel fibers is used as the reinforcing cord 34. The reinforcing cord layer 32 can be easily formed by spirally winding the reinforcing cord 34, but the reinforcing cord 34 may be discontinuous in the tire width direction. Further, for example, a reinforcing material (polymer material, metal fiber, cord, nonwoven fabric, woven fabric, or the like) is embedded in the tire bead portion 22 or the tire side portion 24, and the tire skeleton member 14 is made of this reinforcing material. It may be reinforced.

  On the outer circumferential side of the crown portion 26 in the tire radial direction, a tread rubber 16 made of a material having higher wear resistance than the thermoplastic material forming the tire frame member 14, for example, rubber, is disposed. The rubber used for the tread rubber 16 is preferably the same type of rubber as that used in conventional rubber pneumatic tires. Instead of the tread rubber 16, a tread formed of another kind of thermoplastic material that is more excellent in wear resistance than the thermoplastic material forming the tire frame member 14 may be used. Further, the tread rubber 16 is formed with a tread pattern including a plurality of grooves on the ground contact surface with the road surface, similarly to a conventional rubber pneumatic tire.

  As shown in FIGS. 3 and 4, in the tire manufacturing method of the present invention, a tire manufacturing outer mold 52S and a tire manufacturing inner mold 52U are prepared, and these tire manufacturing outer mold 52S and tire manufacturing are prepared. The inner mold 52U constitutes the tire manufacturing mold 52 of the present invention.

  As can be seen from FIG. 4, the tire manufacturing outer mold 52 </ b> S includes a plurality of (8 in total in the present embodiment) outer mold members 56. As can be seen from FIG. 3, the tire manufacturing outer mold 52S (outer mold member 56) is entirely disposed in a state in which the unvulcanized tread rubber 16 is disposed on the crown portion 26 of the tire frame member 14. The tread rubber 16 can be covered without a gap from the tire outer peripheral side.

  As shown in FIG. 4, each outer mold member 56 is pressed and released to the tire inner peripheral side by a pressing mechanism 58. At the time of pressing, the tire manufacturing outer mold 52S as a whole presses the tread rubber 16 toward the tire inner peripheral side. Further, when the pressure is released, the pressure on the tire inner peripheral side against the tread rubber 16 is released, and the outer mold member 56 can be separated from the tread rubber 16. The pressing mechanism 58 can be replaced with other known pressing means.

  Each outer mold member 56 is supplied with a sufficient amount of heat to vulcanize and bond the tread rubber 16 to the tire frame member 14 from a heat source (not shown).

  As shown in FIG. 3, each of the outer mold members 56 contacts and covers the unvulcanized tread rubber 16 disposed on the crown portion 26 of the tire frame member 14 in the tire width direction. It is made into the shape which has the width | variety which can be. Further, on each contact surface with the tread rubber 16 in each of the outer mold members 56, ribs 56T for forming a predetermined tread pattern are formed.

  On the other hand, as can be seen from FIG. 4, the inner molds 52U for tire manufacture are plurally arranged alternately in the circumferential direction on the tire inner circumferential side with respect to the crown portion 26 of the tire frame member 14 (this embodiment). In this example, four inner mold members 60 and 62 are provided. Of these, the four inner mold members 60 are formed in a substantially trapezoidal shape that tapers from the tire inner peripheral side toward the tire outer peripheral side, and the side surface 60S is tapered. The other inner mold member 62 is disposed between these inner mold members 60, and the side surface 60 </ b> S of the inner mold member 60 is in surface contact with the side surface 62 </ b> S of the inner mold member 62. In this state, the tire manufacturing inner mold 52U (inner mold members 60, 62) is annular as a whole so that the crown portion 26 can be covered without a gap from the tire inner peripheral side.

  The inner mold member 60 is supported at a position that determines the inner surface shape on the tire outer peripheral side by further moving the moving mechanism 64 on the tire inner peripheral side. At this time, since the side surface 60S of the inner mold member 60 supports the side surface 62S of the inner mold member 62, the inner mold 52U for tire manufacture as a whole connects the crown portion 26 and the tread rubber 16 to the outer mold for tire manufacture. It is clamped between the molds 52S. Further, when the pressure is released, the inner mold member 60, 62 can be removed from the tire frame member 14 because the pressure from the outer mold member 56 to the inner circumferential side of the tread rubber 16 is released.

  As shown in FIG. 3, each of the inner mold members 60 and 62 has a contact surface 66 that contacts the crown portion 26 from the tire inner peripheral side. In other words, the inner mold members 60 and 62 are in contact with the tread rubber arrangement portion 14 </ b> S through the contact surface 66. However, the contact surface 66 does not extend in the tire width direction, that is, toward the tire side portion 24, and the inner mold 52U (inner mold members 60, 62) for tire manufacture is a portion where no tread rubber is disposed. 14N is not in contact with the tire frame member 14.

  In addition, each of the inner mold members 60 and 62 is also supplied with heat from a heat source (not shown), but this amount of heat is less than the amount of heat supplied from the heat source to the outer mold member 56. Is set to In particular, in the present embodiment, the inner mold members 60 and 62 are formed with a flow path through which a heat medium such as steam gas or oil flows, and this flow path has the unvulcanized tread rubber 16 in the crown portion 26. It has a predetermined position and shape so that only a portion necessary for vulcanization adhesion can be heated.

  Next, a tire manufacturing method for manufacturing the tire 12 using the tire manufacturing mold 52 of the present embodiment will be described.

  As shown in FIG. 4, the tire frame member 14 formed in a predetermined shape (annular cross section appears in FIG. 4) is unvulcanized on the tire outer peripheral side, that is, on the outer peripheral side of the crown portion 26. The tread rubber 16 in a state is disposed. As the tread rubber 16, a belt-shaped one may be wound while being in contact with the crown portion 26 of the tire frame member 14, and cut at a predetermined position, and may be an annular shape (the cut portion is appropriately joined) surrounding the crown portion 26. Alternatively, the tread rubber 16 formed in a ring shape in advance may be disposed outside the crown portion 26 in a state where the diameter is slightly expanded, and may be brought into contact with the crown portion 26 by releasing the expansion.

  Then, from the outer side in the tire circumferential direction than the tread rubber 16, the tire manufacturing outer mold 52 </ b> S (outer mold member 56) is brought into contact with the tread rubber 16, and from the tire inner peripheral side with respect to the crown portion 26 of the tire frame member 14. The tire manufacturing inner mold 52U (inner mold members 60, 62) is brought into contact.

  In this state, the pressing mechanism 58 is driven to press the tread rubber 16 from the tire outer peripheral side to the tire inner peripheral side by the outer mold member 56, and at the same time, the crown mechanism 26 is moved from the tire inner peripheral side by the moving mechanism 64. The mold members 60 and 62 support the tire outer peripheral side. That is, the tread rubber 16 and the tire frame member 14 are clamped between the tire manufacturing outer mold 52S and the tire manufacturing inner mold 52U (clamping step). At this time, as can be seen from FIG. 3, the tire manufacturing inner mold 52U is not in contact with the tread rubber non-arranged portion 14N (the tire manufacturing outer mold 52S is also not in contact with the tread rubber non-arranged portion 14N. Contact).

  Here, when heat is supplied from a heat source (not shown) to the outer mold member 56 and the inner mold members 60 and 62 (heating process, vulcanization bonding process), the unvulcanized tread rubber 16 is vulcanized to the crown portion 26. In addition to being bonded, a predetermined tread pattern is formed on the tread rubber 16 by the ribs 56T of the outer mold member 56.

  At this time, the inner mold members 60 and 62 are in contact with the tread rubber placement portion 14S through the contact surface 66, but are not in contact with the tread rubber non-placement portion 14N. That is, heat is supplied to the tire frame member 14 only at a portion necessary for vulcanizing and bonding the tread rubber 16 to the crown portion 26, and heat supply to the tire frame member 14 is not performed at other portions. Since the tire frame member of the present embodiment is made of a thermoplastic material as described above, there is a possibility that the tire frame member may be deformed by heat shrinkage or melting due to heat supply of a predetermined level or more. However, in the present embodiment, since heat is not supplied from the tire manufacturing inner mold 52U to the tread rubber non-arranged portion 14N, deformation due to heat supply to the tire frame member 14 exceeding a predetermined amount can be suppressed. .

  Moreover, in the present embodiment, the amount of heat supplied from the heat source to the inner mold members 60 and 62 is made smaller than the amount of heat supplied to the outer mold member 56. Therefore, compared with the case where the amount of heat supplied to the inner mold members 60 and 62 is equal to the amount of heat supplied to the outer mold member 56, the amount of heat supplied to the tire frame member 14 is reduced. That is, also by this, the deformation resulting from the heat supply to the tire frame member 14 of a predetermined amount or more can be suppressed.

  In this way, when the tire 12 is manufactured by vulcanizing and bonding the tread rubber 16 to the crown portion 26 of the tire frame member 14 from the tire outer peripheral side, the pressing mechanism 58 presses and moves the outer mold member 56. The support of the inner mold members 60 and 62 is released, the outer mold member 56 is separated from the tread rubber 16, the inner mold members 60 and 62 are separated from the tire frame member 14, and the tire 12 is taken out.

  As can be seen from the above description, in the tire manufacturing method of the present embodiment, the inner mold 52U for tire manufacture, which is an inner clamping member, is configured to be in non-contact with the tread rubber non-arranged portion 14N, and the inner mold member 60. , 62 is used in combination with a configuration in which the amount of heat supplied to the outer mold member 56 is less than the amount of heat supplied to the outer mold member 56, thereby suppressing the amount of heat supplied to the tire frame member 14. In short, if the amount of heat supplied from the inner pinching member to the tire frame member 14 is less than the amount of heat supplied from the outer pinching member to the tire frame member 14, the tire frame member 14 configured to contain a thermoplastic resin, It is possible to suppress deformation caused by excessive heat supply. For example, even when the amount of heat supplied from the heat source to the inner mold members 60 and 62 is equal to the amount of heat supplied to the outer mold member 56, the tire manufacturing inner mold 52U is not attached to the tread rubber non-arranged portion 14N. Since it is in contact, there is an effect of suppressing deformation due to heat supply to the tire frame member 14 by a predetermined amount or more.

  5 and 6 show some steps of the tire manufacturing method according to the second embodiment of the present invention. In the tire manufacturing method of the second embodiment, the same outer tire mold 52S for tire manufacture as that of the tire manufacturing method of the first embodiment is used, but a bladder 82 is used instead of the inner mold 52U for tire manufacturing. ing.

  The bladder 82 is formed so as to swell in an annular shape as a whole as shown in FIG. 6 when a gas such as air is introduced therein. Then, when it swells in an annular shape in this way, as shown in FIG. 5, it enters the inside of the tire frame member 14 (the tire inner peripheral side) and contacts the crown portion 26 and the tire side portion 24 in the radial cross section. It is supposed to be. In the second embodiment, when the bladder 82 is inflated, that is, in the clamping step, the crown portion 26 is pressed toward the tire outer periphery, and the crown portion 26 and the tread rubber 16 are clamped between the tire manufacturing outer mold 52S. To do. Further, when the bladder 82 contracts, the pressing of the crown portion 26 toward the tire outer peripheral side is released, and the bladder 82 can be extracted from the inside of the tire frame member 14.

  In order to inflate the bladder 82, warm air is supplied into the bladder 82 from a hot air supply source (not shown). In the heating process (vulcanization adhesion process) of the second embodiment, the amount of heat supplied to the bladder 82 by the warm air is set to be smaller than the amount of heat supplied from the heat source to the outer mold member 56. Thereby, the temperature of the bladder 82 is lower than the temperature of the outer mold member 56.

  In the tire manufacturing method of the second embodiment, the tread rubber 16 and the tire frame member 14 are clamped between the tire manufacturing outer mold 52S and the bladder 82 in the clamping process. At this time, the bladder 82 is also in contact with the tire frame member 14 in the tread rubber non-arranged portion 14N. However, in the next heating step (vulcanization adhesion step), the amount of heat supplied from the bladder 82 to the tire frame member 14 is less than the amount of heat supplied from the tire manufacturing outer mold 52S to the tire frame member 14. That is, also in the tire manufacturing method of the second embodiment, it is possible to suppress deformation due to heat supply to the tire frame member 14 by a predetermined amount or more.

  In this way, in order to suppress the deformation caused by the heat supply of the predetermined amount or more to the tire frame member 14 as described above, the heat supply amount to the bladder 82 is changed to the heat supply amount to the outer mold member 56 as described above. It is not limited to the structure which makes it less. For example, depending on the material of the outer mold member 56 and the bladder 82, the atmosphere at the manufacturing site, etc., the amount of heat supplied to the bladder 82 and the amount of heat supplied to the outer mold member 56 are equal, or the supply to the bladder 82 Even when the amount of heat is greater than the amount of heat supplied to the outer mold member 56, the temperature of the bladder 82 may be lower than the temperature of the outer mold member 56. Deformation due to supply can be suppressed. Thus, the heat supply to the tire frame member 14 may be controlled in the relative relationship between the heat supply to the bladder 82 and the heat supply to the outer mold member 56, or the bladder 82 and the outer mold member 56 may be controlled. These temperatures may be detected by a temperature sensor or the like to control the heat supply to the tire frame member 14.

  Further, in the configuration in which the amount of heat supplied to the bladder 82 is less than the amount of heat supplied to the outer mold member 56, the configuration in which the heat supply to the bladder 82 is cut off, that is, the amount of heat supplied to the bladder 82 is made zero. Configuration is also included. Thereby, the deformation | transformation resulting from the heat supply more than the predetermined amount to the tire frame member 14 can be suppressed more effectively.

  The second embodiment is essentially that the amount of heat supplied to the inner clamping member (the bladder 82 in the above example) or the temperature is made lower than that of the outer clamping member (the outer mold for tire manufacture 52S). Therefore, if this condition is satisfied, the inner clamping member is not limited to the bladder 82 in the second embodiment. For example, a mold that contacts not only the tread rubber placement portion 14S but also the tread rubber non-placement portion 14N (this point is different from the inner mold 52U for tire manufacture of the first embodiment) may be used as the inner clamping member. It becomes possible. Further, the tread rubber 16 may be bonded to the tire frame member 14 in a state where the tire frame member 14 is assembled to the rim without using the bladder 82 and the internal pressure is directly applied to the tire frame member 14 through a valve or the like. Good.

  In each of the above-described embodiments, the tire manufacturing method in which the tread rubber 16 is directly brought into contact with the crown portion 26 of the tire frame member 14 and bonded is described. However, an adhesive action is provided between the crown portion 26 and the tread rubber 16. You may perform the tire manufacturing method of this invention in the state which apply | coated the member to play, for example, the adhesive layer 92 of 1 layer or 2 layers. The adhesive 92 is not limited to a specific type, but for example, a triazine thiol-based material can be used, and an unvulcanized rubber can also be used.

  Further, before the adhesive 92 is applied to the outer peripheral surface of the crown portion 26, the outer peripheral surface may be buffed with a sandpaper, a grinder or the like to make it easier to attach the adhesive 92. Further, the outer peripheral surface after buffing may be washed with alcohol or the like. In addition, corona treatment or ultraviolet irradiation treatment may be performed after buffing. Although the preferable environment in the case of apply | coating the adhesive agent 92 changes with kinds of adhesive agent, it is preferable to carry out in the environment of 70% or less of humidity in general.

  By applying an adhesive material, for example, a rubber cement composition, to the back surface (the surface facing the crown portion 26) of the tread rubber 16 or the outer peripheral surface of the crown portion 26, the cored rubber 16 adheres to the crown portion 26. Thus, it may be set as a temporary fix | stop state and workability | operativity may be improved.

  The adhesive 92 only needs to satisfy both the adhesiveness to the tread rubber 16 before vulcanization and the adhesiveness to the tire frame member 14 to the tread rubber 16 after vulcanization. When SBR (styrene-butadiene rubber) is used as the material of the tread rubber 16, it is preferable to use, for example, SBR-based splice cement as the rubber cement composition 42. Further, when an SBR rubber having a high NR (natural rubber) blending ratio is used as a material of the tread rubber 16, it is preferable to use a blend of BR (butadiene rubber) with an SBR splice cement. In addition, as the rubber cement composition 42, it is possible to use a solventless cement containing a liquid elastomer such as liquid BR or a cement mainly composed of a blend of IR (isoprene rubber) -SBR.

  In each of the above embodiments, the vulcanization temperature when vulcanizing the tread rubber 16 is preferably 100 ° C. or higher and 180 ° C. or lower. When the temperature exceeds 180 ° C., even when the configuration in which the heat supply from the inner clamping member to the tire frame member 14 is suppressed as in each of the above embodiments, the tire frame from the outer clamping member (the outer mold for tire manufacture 52S) is adopted. Heat may act on the member 14 and be affected by this heat, but if it is 180 ° C. or less, such influence can be reduced. Further, when the temperature is less than 100 ° C., the tread rubber 16 may not be sufficiently vulcanized, but when the temperature is 100 ° C. or higher, the tread rubber can be sufficiently vulcanized.

  Further, in each of the above embodiments, a tire manufacturing method in the case where the tread rubber 16 in an unvulcanized state (including a semi-vulcanized state) is bonded to the tire frame member 14 is described. Tread rubber) may be bonded to the tire frame member 14.

  FIG. 7 shows a partial process of the tire manufacturing method in which the vulcanized tread rubber 116 is bonded to the crown portion 26 of the tire frame member 14 as a third embodiment of the present invention. As can be seen from FIG. 7, in the third embodiment, the above-described adhesive 92 is interposed between the crown portion 26 of the tire frame member 14 and the tread rubber 116.

  As shown also in FIG. 8, in the tire manufacturing method of the third embodiment, a tire manufacturing mold 152 substantially the same as that of the first embodiment can be used. That is, the tire manufacturing mold 152 applied to the tire manufacturing method according to the third embodiment includes the tire manufacturing outer mold 152S and the tire manufacturing inner mold 152U. The mold 152S includes eight outer mold members 156 in total.

  The outer mold 152S for tire manufacture (the entire outer mold member 156) is configured such that the vulcanized tread rubber 116 is disposed on the crown portion 26 of the tire frame member 14 and the tire outer periphery is more than the crown portion 26. From the side, the tread rubber 116 can be covered without a gap. Further, each outer mold member 156 is pressed to the tire inner peripheral side by the pressing mechanism 58 to press the tread rubber 116 toward the tire inner peripheral side with the entire tire manufacturing outer mold 152S and press By releasing, the outer mold member 156 can be separated from the tread rubber 116. Each outer mold member 156 is supplied with a sufficient amount of heat to heat the adhesive 92 and exert a sufficient adhesive force from a heat source (not shown).

  However, in the third embodiment, since a predetermined tread pattern is already formed on the vulcanized tread rubber 116, unlike the first embodiment, a tread pattern is formed on the tire manufacturing outer mold 152S. The ribs for this purpose need not be formed, but are preferably formed for reliable bonding.

  The inner molds 152U for tire manufacture are a plurality of inner molds (four in the present embodiment) arranged alternately in the circumferential direction on the tire inner circumferential side with respect to the crown portion 26 of the tire frame member 14. One of the inner mold members 162 is provided between the four inner mold members 160 that have members 160 and 162 and are formed in a substantially trapezoidal shape that tapers from the tire inner peripheral side toward the tire outer peripheral side. Is arranged. The tapered side surface 160S of the inner mold member 160 is in surface contact with the side surface 162S of the inner mold member 162.

  When the inner mold member 160 is pressed from the tire inner periphery side to the tire outer periphery side by the moving mechanism 64, the side surface 160S of the inner mold member 160 presses the side surface 162S of the inner mold member 162. The mold 152U as a whole presses the crown portion 26 toward the tire outer peripheral side, and is sandwiched between the crown portion 26, the adhesive 92, the tread rubber 116, and the tire manufacturing outer mold 52S. By releasing the pressure, the pressure on the outer peripheral side of the tire against the crown portion 26 is released, and the inner mold members 160 and 162 can be pulled out from the tire frame member 14.

  Each of the inner mold members 160 and 162 has a contact surface 66 that comes into contact with the crown portion 26, that is, the tread rubber arrangement portion 14S from the tire inner peripheral side. The contact surface 66 is in the tire width direction, that is, the tire. It does not extend toward the side portion 24 and is not in contact with the tire frame member 14 in the tread rubber non-arranged portion 14N.

  Each of the inner mold members 160 and 162 is supplied with heat from a heat source (not shown), but the amount of heat is less than the amount of heat supplied from the heat source to the outer mold member 156. Is set to Particularly in the present embodiment as well, as in the first embodiment, the inner mold members 160 and 162 are formed with flow paths for flowing a heat medium such as steam gas and oil, and are necessary for heating the adhesive 92. It has a predetermined shape so that only the part can be heated.

  In the tire manufacturing method of the third embodiment, the vulcanized tread rubber 116 is disposed on the tire outer peripheral side, that is, on the outer peripheral side of the crown portion 26 with respect to the tire frame member 14 formed in a predetermined shape. Further, an adhesive 92 is interposed between the crown portion 26 and the tread rubber 116. Then, from the outer side in the tire circumferential direction than the tread rubber 116, the tire manufacturing outer mold 152 </ b> S (outer mold member 156) is brought into contact with the tread rubber 116, and the tire frame member 14 from the tire inner peripheral side than the crown portion 26. The tire manufacturing inner mold 152U (inner mold members 160, 162) is brought into contact. In this state, the pressing mechanism 58 is driven to hold the tread rubber 116, the adhesive 92, and the tire frame member 14 between the tire manufacturing outer mold 152S and the tire manufacturing inner mold 152U (holding process). At this time, as can be seen from FIG. 7, the tire manufacturing inner mold 152U is not in contact with the tread rubber non-arranged portion 14N (of course, the tire manufacturing outer mold 152S is also not in the tread rubber non-arranged portion 14N. And no contact).

  When heat is supplied from a heat source (not shown) to the outer mold member 156 and the inner mold members 160 and 162 (heating process), the adhesive 92 exhibits an adhesive effect, and the vulcanized tread rubber 116 is transformed into the crown portion 26. Glued to. At this time, the inner mold members 160 and 162 are in contact with the tread rubber arrangement portion 14S via the contact surface 66 but are not in contact with the tread rubber non-arrangement portion 14N. Heat is supplied to the tire frame member 14 only at a portion necessary for bonding to the tire 26, and no heat is supplied to the tire frame member 14 at other portions. Therefore, since a predetermined amount or more of heat is not supplied to the tire frame member 14 made of a thermoplastic material, deformation due to a predetermined amount or more of heat supply to the tire frame member 14 can be suppressed.

  In addition, in this embodiment, the amount of heat supplied from the heat source to the inner mold members 160 and 162 is made smaller than the amount of heat supplied to the outer mold member 156. Compared with the case where the amount of heat supplied to the inner mold members 160 and 162 is equal to the amount of heat supplied to the outer mold member 156, the amount of heat supplied to the tire frame member 14 is reduced. Deformation caused by heat supply to the member 14 exceeding a predetermined amount can be suppressed.

  In this way, when the tire 12 is manufactured by bonding the vulcanized tread rubber 116 to the crown portion 26 of the tire frame member 14 from the tire outer peripheral side via the adhesive 92, the outer mold by the pressing mechanism 58 is produced. The inner mold members 160 and 162 supported by the pressing and moving mechanism 64 of the member 156 are released, the outer mold member 156 is separated from the tread rubber 116, and the inner mold members 160 and 162 are separated from the tire frame member 14, respectively. The tire 12 is taken out.

  As can be seen from the above description, also in the tire manufacturing method of the third embodiment, the inner mold 152U for tire manufacture, which is an inner clamping member, is configured to be in non-contact with the tread rubber non-arranged portion 14N, and the inner mold The amount of heat supplied to the tire frame member 14 is suppressed in combination with a configuration in which the amount of heat supplied to the members 160 and 162 is less than the amount of heat supplied to the outer mold member 156. In short, if the amount of heat supplied from the inner pinching member to the tire frame member 14 is less than the amount of heat supplied from the outer pinching member to the tire frame member 14, the tire frame member 14 configured to contain a thermoplastic resin, It is possible to suppress deformation due to heat supply. For example, even when the amount of heat supplied from the heat source to the inner mold members 160 and 162 is equal to the amount of heat supplied to the outer mold member 156, the tire manufacturing inner mold 152U is not attached to the tread rubber non-arranged portion 14N. Since it is in contact, there is an effect of suppressing deformation due to heat supply to the tire frame member 14 by a predetermined amount or more.

  FIG. 9 shows some steps of the tire manufacturing method according to the fourth embodiment of the present invention. In the tire manufacturing method of the fourth embodiment, as in the tire manufacturing method of the third embodiment, an adhesive 92 is interposed between the vulcanized tread rubber 116 and the crown portion 26 of the tire frame member 14, This is a tire manufacturing method in which the tread rubber 116 is bonded to the crown portion 26. And although the outer mold 52S for tire manufacture similar to the tire manufacturing method of 3rd Embodiment is used, it replaces with the inner mold 52U for tire manufacture, and the bladder 182 substantially the same as 2nd Embodiment is used. ing.

  When a gas such as air is introduced into the bladder 182, the bladder 182 is formed so as to swell in an annular shape as a whole as shown in FIG. 10 .As shown in FIG. In the cross section in the radial direction, it enters the inside of the tire frame member 14 (the tire inner peripheral side) and contacts the crown portion 26 and the tire side portion 24. That is, the bladder 182 presses the crown portion 26 toward the tire outer periphery during expansion, that is, in the clamping step, and clamps the crown portion 26, the adhesive 92, and the tread rubber 116 between the tire manufacturing outer mold 52 </ b> S. To do. Further, when the bladder 182 is contracted, the pressing of the crown portion 26 toward the tire outer peripheral side is released, and the bladder 182 can be extracted from the inside of the tire frame member 14.

  In order to inflate the bladder 182, warm air is supplied into the bladder 182 from a hot air supply source (not shown). In the heating process of the fourth embodiment, the amount of heat supplied to the bladder 182 by the warm air is set to be smaller than the amount of heat supplied from the heat source to the outer mold member 56. Thereby, the temperature of the bladder 182 is lower than the temperature of the outer mold member 56.

  Therefore, in the tire manufacturing method of the fourth embodiment, the bladder 182 is also in contact with the tire frame member 14 in the tread rubber non-arranged portion 14N, but the amount of heat supplied from the bladder 182 to the tire frame member 14 is This is less than the amount of heat supplied from the manufacturing outer mold 152S to the tire frame member 14. That is, also in the tire manufacturing method of the fourth embodiment, it is possible to suppress deformation due to heat supply to the tire frame member 14 by a predetermined amount or more.

  Also in the fourth embodiment, as in the second embodiment, in order to suppress deformation due to the heat supply of a predetermined amount or more to the tire frame member 14, the amount of heat supplied to the bladder 82 is reduced as described above. The heat supply to the tire frame member 14 is not limited to the configuration in which the amount of heat supplied to the outer mold member 56 is less than the amount of heat supplied to the bladder 182 and the amount of heat supplied to the outer mold member 56. Alternatively, the temperature of the bladder 182 and the outer mold member 56 may be detected by a temperature sensor or the like to control the heat supply to the tire frame member 14.

  In the above description, the tire 12 using the tire frame member 14 that is assembled to the rim and has the bead core 20 embedded therein is taken as an example. However, the tire according to the present invention is not limited to this, and FIG. The tire 202 having the structure shown in FIG.

  In the tire 202, a plurality of hollow tubes 220 (three in FIG. 11) arranged in an annular shape by a thermoplastic material are arranged in the tire width direction to form a tire frame member 204, and a belt 222 is attached to the outer peripheral portion thereof. The embedded tread rubber 206 is bonded to the rim 18 having a recess that engages with the tube 220. The tire 202 is not provided with a bead core.

  In addition, as shown in FIG. 12, the tube 220 is joined with a joining thermoplastic material by facing the tube halves 220A and 220B having a semicircular cross section divided into two on the tire outer peripheral side and the tire inner peripheral side. Or can be joined by a welding sheet (not shown). By dividing the tube 220 into the tire outer peripheral side and the tire inner peripheral side in this way, the inner mold member can be arranged from the inner side of the tube half body 220A, as shown in FIG. It can be extracted from the inside of the tube half 22A.

  Further, as a tire 232 shown in FIG. 13, a tube having a single frame 220 as a tire frame member, and a tread rubber 206 bonded to a center portion (tube outer peripheral portion) extended from the tire side portion of the tube 220. It can also be configured as a type. As shown in FIG. 14, the tube 220 is also composed of tube halves 220A and 220B having a semicircular cross section that is divided into two on the tire outer peripheral side and the tire inner peripheral side). Further, when the tube 22 having such a structure is used, the tread rubber 206 may be bonded to the tube 220 in a state where an internal pressure is directly applied to the tube 220 through a valve or the like.

  The tires 202 and 232 having any structure can be manufactured by the tire manufacturing methods of the first to fourth embodiments described above. In the series of steps for manufacturing the tire 12, the order of the steps may be changed as appropriate without departing from the present invention.

12 tire 14 tire frame member 14S tread rubber arrangement portion 14N tread rubber non-arrangement portion 16 tread rubber 18 rim 20 bead core 22 tire bead portion 24 tire side portion 26 crown portion 30 bead seat 32 reinforcing cord layer 52 tire manufacturing mold 52S tire Outer mold for manufacturing 52U Inner mold for manufacturing tire 56 Outer mold member 58 Pressing mechanism 60, 62 Inner mold member 64 Moving mechanism 66 Contact surface 82 Bladder 92 Intermediate layer 116 Tread rubber 120A Tube half body 152 Tire manufacturing mold Type 152S Outer mold for tire manufacture 152U Inner mold for tire manufacture 156 Outer mold member 160, 162 Inner mold member 160S, 162S Side 182 Bladder 202 Tire 204 Tire frame member 206 Tread rubber 220 Tube 222 Belt 232 Tire

Claims (6)

A tread rubber constituting a tread of a tire is disposed on a tire frame member including a thermoplastic material from a tire outer peripheral side, and an outer clamping member is disposed further on the tire outer peripheral side than the tread rubber. A sandwiching step of sandwiching the tread rubber and the tire skeleton member with the inner sandwiching member from the opposite side of the outer sandwiching member with the rubber and the tire skeleton member interposed therebetween;
At least the amount of heat supplied from the inner clamping member to the tread rubber non-arranged portion where the tread rubber is not arranged in the tire frame member is less than the amount of heat supplied from the outer clamping member to the tread rubber. A heating step of heating the tread rubber and bonding it to the tire frame member ,
The tire manufacturing method , wherein, in the heating step, the amount of heat supplied is less than the amount of heat supplied to the outer clamping member by interrupting heat supply to the inner clamping member . A tread rubber constituting a tread of a tire is arranged on a tire skeleton member including a thermoplastic material in a state before vulcanization is completed from the tire outer peripheral side, and an outer clamping member further on the tire outer peripheral side than the tread rubber A sandwiching step of sandwiching the tread rubber and the tire skeleton member with the inner sandwiching member from the opposite side of the outer sandwiching member with the tread rubber and the tire skeleton member sandwiched therebetween,
At least the amount of heat supplied from the inner clamping member to the tread rubber non-arranged portion where the tread rubber is not arranged in the tire frame member is less than the amount of heat supplied from the outer clamping member to the tread rubber. A vulcanization adhesion step of heating the tread rubber and vulcanizing and adhering to the tire frame member ,
The tire manufacturing method , wherein, in the heating step, the amount of heat supplied is less than the amount of heat supplied to the outer clamping member by interrupting heat supply to the inner clamping member .   The tire manufacturing method according to claim 1 or 2, wherein the heating step is performed using the inner clamping member that is not in contact with the tread rubber non-arranged portion.   The tire manufacturing method according to any one of claims 1 to 3, wherein in the heating step, the temperature of the inner clamping member is made lower than the temperature of the outer clamping member. The tire according to any one of claims 1 to 4 , wherein the sandwiching step and the heating step are performed in a state where an adhesive for adhering them is disposed between the tire frame member and the tread rubber. Production method. A tire manufacturing mold used in the tire manufacturing method according to claim 3,
An outer clamping member disposed on the tire outer periphery side than the tread rubber;
An inner clamping member that sandwiches the tread rubber and the tire frame member from the side opposite to the outer clamping member with the tread rubber and the tire frame member interposed therebetween and is not in contact with the tread rubber non-arranged portion;
A mold for manufacturing tires.

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