Method for manufacturing tire filling member

Abstract

To provide a method of curbing thermal degradation of a manufactured tire filling member.SOLUTION: In a manufacturing method, a foam molding die 40 to be used for manufacturing a tire filling member 10 includes a pair of outer dies 41, 42 and an insert 43 to be arranged therebetween. The insert 43 has a projecting part 43B projecting from inner peripheries of cavities 41A, 42A of the pair of outer dies 41, 42 into the cavities 41A, 42A. An outer periphery part of the extending-out part 43B is made an outer-periphery bulging part 43B1 that bulges into a circular shape in section.SELECTED DRAWING: Figure 14

Description

[Technical field]

[0001] The present disclosure relates to a method for manufacturing a tire filling element to be disposed inside a tire. [Background technology]

[0002] 2. Description of the Related Art Conventionally, there is known a technique for filling a tire with a tire filling member inside a tire (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2004-9768 A (Fig. 1, etc.) Summary of the Invention [Problem to be solved by the invention]

[0004] There is a demand for suppressing deterioration of manufactured tire filling members due to heat. [Means for solving the problem]

[0005] A first aspect of the invention made to solve the above problems is a method for manufacturing a tire filling member using a foam molding die, the tire filling member having an overall ring-shaped or arc-shaped cavity inside that extends along its entire circumference or entire length, the foam molding die including an outer mold with a cavity corresponding to the outer shape of the tire filling member, and a insert corresponding to the cavity. [Brief description of the drawings]

[0006] [Figure 1] FIG. 1 is a cross-sectional view of a wheel in which a tire filling member according to a first embodiment is filled. [Diagram 2] FIG. 2 is a perspective view of a tire filling member [Diagram 3] A plan view of tire filling elements arranged in an annular shape. [Figure 4]Cross-sectional view of a tire filling member [Diagram 5] A perspective view of a foam molding die [Figure 6] Plan view of the first outer mold of the foam molding die [Figure 7] Plan view of the second outer mold of the foam molding die [Figure 8] Top view of foam mould nest [Figure 9] Cross-section of a foam molding die [Figure 10] Cross-section of a foam molding die [Figure 11] Cross-section of a foam molding die [Figure 12] FIG. 1 is a diagram for explaining a manufacturing process of a tire filling member. [Figure 13] FIG. 1 is a diagram for explaining a manufacturing process of a tire filling member. [Figure 14] FIG. 1 is a diagram for explaining a manufacturing process of a tire filling member. [Figure 15] FIG. 11 is a cross-sectional view of a wheel in which a tire filling member according to a second embodiment is filled. [Figure 16] Cross-sectional view of a tire filling member [Figure 17] Cross-section of a foam molding die [Figure 18] Plan view of the first outer mold of the foam molding die [Figure 19] Plan view of the second outer mold of the foam molding die [Figure 20] Top view of foam mould nest [Figure 21] FIG. 1 is a diagram for explaining a manufacturing process of a tire filling member. [Figure 22] FIG. 1 is a diagram for explaining a manufacturing process of a tire filling member. [Diagram 23] FIG. 1 is a diagram for explaining a manufacturing process of a tire filling member. [Figure 24] 1 is a plan view of a mold insert for a foam molding according to a modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0007] [First embodiment] 1 shows a tire filling member 10 manufactured by the manufacturing method of the tire filling member 10 of the present disclosure. The tire filling member 10 is packed inside a wheel 80 for a bicycle, for example.

[0008] The wheel 80 is formed by mounting a tire 81 on a wheel 91. In detail, the tire 81 has a pair of bead portions 84 that sandwich an inward opening 86 that opens radially inward in the width direction, and the tire 81 is attached to the wheel 91 by fitting the bead portions 84 into an outer peripheral recess 92U that extends in the circumferential direction and is formed on the outer peripheral surface of a rim 92 of the wheel 91. The tire filling member 10 is disposed in an annular inner region R between the tire 81 and the wheel 91. The cross section of the annular inner region R has a shape in which a part of a circle protrudes radially inward of the tire 81. The tire 81 and the wheel 91 can be the same as those in a general tire structure having an air tube.

[0009] The tire filling member 10 is a foam molded product, and extends in an arc shape as shown in Fig. 2. Then, as shown in Fig. 3, a plurality of tire filling members 10 are lined up in the circumferential direction of the annular internal region R of the wheel 80 and arranged in an annular shape, so that the tire filling members 10 fill the entire circumferential direction of the annular internal region R of one wheel 80. In this embodiment, the tire filling member 10 has a length that divides the annular internal region R in half, and the two tire filling members 10 fill the annular internal region R.

[0010] Both circumferential end faces 18 of the tire filling member 10 are formed so as to be inclined with respect to the radial direction of the wheel 80. In this embodiment, one end face 18A of the tire filling member 10 is inclined so as to be inclined toward the circumferential outside as it approaches the radial inside, and the other end face 18B of the tire filling member 10 is inclined so as to be inclined toward the circumferential inside as it approaches the radial inside. The inclination angle of the one end face 18A and the inclination angle of the other end face 18B are the same. The butted end faces 18 of the tire filling members 10 may or may not be joined with an adhesive or the like.

[0011] 1, the tire filling member 10 has a body portion 20 disposed within a tire 81 corresponding to the cross section of the annular internal region R, and an inward protrusion 30 protruding radially inward from the body portion 20. The cross section of the body portion 20 is substantially circular, and the cross section of the inward protrusion 30 is mountain-shaped and gradually narrows toward the protruding tip of the inward protrusion 30.

[0012] 4, the tire filling member 10 of this embodiment has a hollow portion 25. The hollow portion 25 has, for example, a circular cross-sectional shape and is in the center of the body portion 20, extending in the longitudinal direction of the body portion 20. The cross-sectional shape of the hollow portion 25 may be an elliptical shape that is elongated in the radial or width direction of the tire 81, or a polygonal shape such as a square.

[0013] Furthermore, the tire filling member 10 is formed with a slit 16 that vertically divides the space between the hollow portion 25 and the protruding tip of the inward protrusion 30. The slit 16 is disposed in the center of the tire filling member 10 in the width direction, and the width of the slit 16 is smaller than the diameter of the hollow portion 25.

[0014] The hollow portion 25 and the slit 16 extend over the entire longitudinal direction of the tire filling member 10, and both ends thereof are open to the end faces 18A, 18B of the tire filling member 10, respectively (see FIG. 2). As a result, when the two tire filling members 10 are filled in the annular inner region R, the hollow portion 25 and the slit 16 are disposed over the entire circumferential direction of the annular inner region R.

[0015] As shown in FIG. 1, when the tire filling member 10 is filled into the annular internal region R, the body portion 20 is contained within the tire 81, and the inward protrusion 30 protrudes from the inward opening 86 of the tire 81 and abuts against the outer peripheral surface of the wheel 91.

[0016] In the tire filling member 10 of this embodiment, the width of the body portion 20 is larger than the inner diameter of the annular internal region R, and when the tire filling member 10 is filled into the annular internal region R, it is pressed against and compressed against the inner surface of the tire 81, making it easy to adhere to the inner surface of the tire 81. Also, the width of the inward protrusion 30 is larger than the width of the inward opening 86 of the tire 81, and the elastic force of the inward protrusion 30 makes it possible to press the opening edge portion (i.e., the bead portion 84) of the inward opening 86 of the tire 81 against the side surface within the outer circumferential recess 92U of the rim 92 from the inside in the width direction.

[0017] 1, nipples 93 are formed to protrude from the bottom surface of the outer circumferential recess 92U of the rim 92. The nipples 93 are arranged, for example, at a plurality of positions in the circumferential direction of the wheel 91. These nipples 93 are received in the slits 16 of the tire filling member 10 and prevent the tire filling member 10 from shifting in the width direction.

[0018] Next, a manufacturing method of the tire filling member 10 of this embodiment will be described. The tire filling member 10 is manufactured by foam molding in a foam molding die 40 shown in Fig. 5. The foam molding die 40 has a pair of outer dies 41, 42 and a nest 43 disposed therebetween. The pair of outer dies 41, 42 are plate-shaped and face each other, and cavities 41A, 42A for molding the tire filling member 10 are provided on the facing surfaces (see Figs. 6 and 7). The cavities 41A, 42A are grooves extending in a substantially semicircular arc shape, and have deep groove portions 41B, 42B that form the body portion 20 of the tire filling member 10 and shallow groove portions 41C, 42C that form the inward protrusion 30.

[0019] 5 and 6, one outer die 41 (hereinafter referred to as the "first outer die 41") of the pair of outer dies 41, 42 has two protrusions 41S, 41T at the corners to close both ends of the cavity 41A in the circumferential direction. The protrusion 41S on the left side in Fig. 6 has a first surface 41S1 that is inclined toward the outside in the circumferential direction as it approaches the inside in the radial direction of the cavity 41A, and a second surface 41S2 and a third surface 41S3 that extend from both ends of the first surface 41S1 to the short side and long side of the first outer die 41, respectively. The protrusion 41T on the right side in Figure 6 has a first surface 41T1 that inclines circumferentially inward as it approaches the radially inward side of the cavity 41A, a second surface 41T2 that extends from the outer end of the first surface 41T1 to the short side of the first outer mold 41, a third surface 41T3 that extends from the inner end of the first surface 41T1 toward the longitudinally inward side of the first outer mold 41, and a fourth surface 41T4 that extends from there to the long side of the first outer mold 41.

[0020] As shown in Fig. 5 and Fig. 6, the other outer die 42 (hereinafter referred to as "second outer die 42") has recesses 42S, 42T formed in a corner thereof, the recesses 42S, 42T having shapes corresponding to the protrusions 41S, 41T of the first outer die 41. When the first outer die 41 and the second outer die 42 are in a closed state, the protrusions 41S, 41T of the first outer die 41 are received in the recesses 42S, 42T of the second outer die 42, and the first surfaces 41S1, 41T1 of the protrusions 41S, 41T of the first outer die 41 close both ends of the cavities 41A, 42A. Due to the inclination of the first surfaces 41S1, 41T1, both ends (one end surface 18A and the other end surface 18B) of the tire filling member 10 molded in the cavities 41A, 42A have an inclined shape.

[0021] The first outer die 41 and the second outer die 42 are formed with injection grooves 41M, 42M that extend from the longitudinal center of the outer edges of the cavities 41A, 42A and open to the outer surfaces of the outer dies 41, 42.

[0022] 5 and 8, the insert 43 has a support portion 43A disposed inside the arc of the cavities 41A, 42A of the outer dies 41, 42, and a protruding portion 43B protruding from the outer edge of the support portion 43A into the cavities 41A, 42A. The planar shape of the support portion 43A is a shape obtained by cutting about 2 / 5 of a circle off by a straight line parallel to the diameter.

[0023] The protruding portion 43B protrudes outward from the arc of the support portion 43A and has a band-shaped shape curved in an arc. The plate thickness of the protruding portion 43B is smaller than the plate thickness of the support portion 43A. The outer edge of the protruding portion 43B is an outer edge protruding portion 43B1 that protrudes in a circular cross section. As shown in FIG. 9, when the insert 43 is disposed between a pair of outer molds 41 and 42, the inner edge of the protruding portion 43B is located inside the arc of the cavities 41A and 42A of the outer molds 41 and 42, and the outer edge of the protruding portion 43B is located in the center of the deep groove portions 41B and 42B of the cavities 41A and 42A. As shown in FIG. 6 and FIG. 8, both ends of the protruding portion 43B in the circumferential direction are shaped to correspond to the side surfaces of the protrusions 41S and 41T of the first outer mold 41. As shown in Figs. 5 and 9, the first outer die 41 and the second outer die 42 are formed with recesses 41U, 42U for receiving the support portion 43A of the insert 43.

[0024] As shown in Figures 10 and 11, when the foam molding die 40 is closed with the insert 43 sandwiched between the pair of outer dies 41, 42, the protruding portion 43B protrudes from the inner edge into the cavities 41A, 42A, and the injection port 40A formed by joining the injection grooves 41M, 42M to the cavities 41A, 42A is in communication with the cavities 41A, 42A. A mold release agent is applied to the pair of outer dies 41, 42 and the insert 43. The pair of outer dies 41, 42 and the insert 43 may be connected by a hinge or the like.

[0025] The foam molding of the tire filling member 10 is performed as follows. That is, first, the foam molding die 40 is oriented so that the cavities 41A, 42A extend parallel to a vertical plane and the centers of the arcs of the cavities 41A, 42A are located upward. In this orientation, a foaming resin raw material liquid is injected into the cavities 41A, 42A from the injection port 40A as shown in Fig. 12. Then, the injected raw material liquid flows down on both sides of the overhanging portion 43B and flows to the ends of the cavities 41A, 42A.

[0026] Thereafter, a blocking plug 40S is attached to the injection port 40A of the foam molding die 40 (see FIG. 13), and the foaming resin raw material liquid is foamed and hardened in the cavities 41A, 42A. This results in the tire filling member 10 (see FIG. 14). There is a small gap between the inner surface of the injection port 40A and the blocking plug 40S to allow gas generated by foaming of the raw material liquid to escape. Alternatively, the blocking plug 40S and the injection port 40A may be screwed together, and the degree of ventilation may change depending on the degree of tightening.

[0027] The raw material liquid is injected while being heated by a hot water jacket or the like, and the injected raw material liquid flows in the cavities 41A, 42A while foaming. The heating increases the fluidity of the raw material liquid and promotes foaming. The raw material liquid may be injected with the foam molding die 40 placed horizontally.

[0028] The tire filling member 10 is removed from the foam molding die 40 as follows. That is, first, the pair of outer dies 41, 42 are opened, and the tire filling member 10 is attached to the insert 43. Then, one end of the tire filling member 10 is grasped and peeled away radially outward from the insert 43, thereby removing the tire filling member 10 from the insert 43. Note that the tire filling member 10 may be removed from the insert 43 by relatively rotating the insert 43 and the tire filling member 10 along an arc.

[0029] The tire filling member 10 of the present embodiment is made of, for example, a urethane elastomer formed by a prepolymer method using a prepolymer made from an isocyanate and a polyol, but is not limited to this.

[0030] As the isocyanate for the prepolymer, for example, either or both of 1,5-naphthalene diisocyanate (NDI) and 3,3'-dimethyl-4,4'-biphenyl diisocyanate (TODI) can be used.

[0031] As the polyol for the prepolymer, for example, a polyol containing 50 to 90 parts by weight of polytetramethylene glycol can be used. As the remaining polyol used together with 50 to 90 parts by weight of polytetramethylene glycol, for example, one or more polyols having a molecular weight of 1000 to 3000 and a functionality of 2 can be used. Examples of such polyols having a molecular weight of 1000 to 3000 and a functionality of 2 include polyethylene glycol, polypropylene glycol, polycaprolactone polyol, and polycarbonate polyol. By making the polytetramethylene glycol 50 to 90 parts by weight in the polyol, high hydrolysis resistance and excellent physical properties such as physical strength and distortion characteristics can be expected. In particular, water such as rainwater may enter the annular inner region R from between the tire 81 and the rim 92, etc., but by increasing the hydrolysis resistance of the tire filling member 10, it is possible to improve the durability of the tire filling member 10.

[0032] The formation of a urethane elastomer by the prepolymer method using a prepolymer (liquid B) is carried out as follows.

[0033] <1st process> A polyol is pre-reacted with a stoichiometric excess of isocyanate to produce a prepolymer (liquid B) with an isocyanate content of 3 to 10% by weight.

[0034] <Second process> At least one chain extender (liquid A) selected from an aliphatic diol having two preferably primary hydroxyl groups and a number average molecular weight of 56 to 210 g / mol, a trifunctional polyol, water, a mixture thereof, and an aromatic diamine is mixed with the prepolymer (liquid B) in an amount such that the ratio of the mol% of the isocyanate groups in the prepolymer (liquid B) to the mol% of the hydroxyl groups in the chain extender (liquid A) or the chain extender blend liquid (liquid A), i.e., the value of [mol% of isocyanate groups in liquid B / mol% of hydroxyl groups in liquid A] is 1.3 to 1.0, to obtain a raw material liquid. The injection amount of the foaming resin raw material into the foaming mold 40 varies depending on the foaming ratio, but from the viewpoint of the balance between the lightness and strength (durability) of the tire filling member 10, an amount of 20 to 60 vol% of the volume of the cavities 41A, 42A of the foaming mold 40 is suitable. If necessary, a foam stabilizer, a surfactant, an anti-aging agent, etc. may be added to the chain extender (solution A).

[0035] Examples of the aliphatic diol used in the second step include 1,4-butanediol, ethylene glycol, diethylene glycol, 1,6-hexanediol, ethoxylated hydroquinone, and cyclohexanediol.

[0036] Examples of the aromatic diamine used in the second step include methylenebis-o-chloroaniline, 3,5-diamino-p-chloroisobutylbenzoate, and trimethylene glycol-di-p-aminobenzoate.

[0037] The foam stabilizer used in the second step may be, for example, one known for use in urethane elastomers, such as a silicone-based foam stabilizer or a fluorine-containing compound-based foam stabilizer.

[0038] As the surfactant and antioxidant used in the second step, for example, those known for use in urethane elastomers can be used.

[0039] According to the tire filling member 10 manufactured in the first and second steps described above, the tire filling member 10 can have good light weight, ride comfort, rolling resistance, durability, and the like.

[0040] The urethane elastomer constituting the tire filling member 10 preferably has a compression set of 3 to 15% measured in accordance with JIS K6262: 2013 and a rebound resilience of 65% or more measured in accordance with JIS K6255: 2013. The density of the urethane elastomer (in accordance with JIS K6268) is 200 to 600 kg / m 3 It is preferable that:

[0041] Next, the effects of the manufacturing method of the tire filling member 10 of this embodiment will be described. When the tire filling member 10 is manufactured by the manufacturing method of this embodiment, a hollow portion 25 is provided in the tire filling member 10. Since the tire filling member 10 has the hollow portion 25, when the tire filling member 10 is filled in a wheel 80 and used, heat generated by repeated deformation can be released to the hollow portion 25, making it possible to suppress deterioration of the tire filling member 10 due to heat. Furthermore, the provision of the hollow portion 25 makes it easier to elastically deform the tire filling member 10, facilitating the filling operation of the tire filling member 10.

[0042] Furthermore, when the tire filling member 10 is manufactured by the manufacturing method of this embodiment, a slit 16 is formed in the tire filling member 10, dividing the radially inner portion from the hollow portion 25 vertically. The tire filling member 10 having the slit 16 makes it easier to shrink the inward protrusion 30 of the tire filling member 10 in the width direction, making the filling operation of the tire filling member 10 easier. Moreover, heat generated in the tire filling member 10 can be released through the slit 16 to the hollow portion 25, making it possible to suppress deterioration of the tire filling member 10 due to heat.

[0043] In the manufacturing method of this embodiment, the foam molding die 40 has a structure in which the insert 43 is provided movably relative to a pair of outer dies 41, 42, so the tire filling member 10 can be easily removed from the foam molding die 40, improving production efficiency. Also, since the tire filling member 10 has a shape with slits 16, it can be peeled off from the insert 43, making removal from the die easier. Furthermore, since the tire filling member 10 is arc-shaped, it can be peeled off from one end of the arc, making removal from the die easier than with an annular tire filling member 10.

[0044] In addition, since the foam molding die 40 is used in a vertically placed state, more foam molding dies 40 can be placed in the same space when molding the tire filling member 10 than if the foam molding die 40 were placed horizontally. Note that the foam molding die 40 may be used in a horizontally placed state if the fluidity of the raw material liquid is high.

[0045] [Second embodiment] 15 and 16 show a tire filling member 50 according to a second embodiment. The tire filling member 50 of the second embodiment is different from the tire filling member 10 of the first embodiment in that the tire filling member 50 of the second embodiment has a cavity 25 but does not have a slit 16.

[0046] The tire filling member 50 of this embodiment is manufactured by foam molding in a foam molding die 70 shown in Figures 17 to 20. The foam molding die 70 has a pair of outer dies 71, 72 and a nest 73 disposed therebetween. The pair of outer dies 71, 72 are provided with cavities 71A, 72A for molding the tire filling member 50, similar to the pair of outer dies 41, 42 of the first embodiment.

[0047] The insert 73 of this embodiment has an arc member 73A in which a wire (which may be a solid structure or a hollow structure) is curved into a substantially semicircular arc shape, and support blocks 73B detachably disposed at both ends of the arc member 73A. The pair of outer dies 71, 72 are formed with recesses 71U, 72U for receiving the support blocks 73B.

[0048] In the foam molding die 70, when the pair of outer dies 71, 72 are closed with the support block 73B of the nest 73 received in the recesses 71U, 72U of the pair of outer dies 71, 72, the nest 73 is held floating within the cavities 71A, 72A.

[0049] The foam molding of the tire filling member 50 is carried out as follows. First, as shown in Fig. 21, a nest 73 is placed in one outer mold 71 (first outer mold 71) of a pair of outer molds 71, 72, and a foaming resin raw material liquid is injected into the cavity 71A. At this time, the foaming resin raw material liquid is supplied onto the nest 73 and flows down the nest 73 into the cavity 71A.

[0050] When the injection of the foaming resin raw material liquid is completed, the other outer mold 72 (second outer mold 72) is closed (see FIG. 22), and the foaming resin raw material liquid foams and hardens in the cavities 71A, 72A. This results in the tire filling member 50 (see FIG. 23). It is preferable to provide the second outer mold 72 with a gas vent hole for releasing gas generated by foaming of the raw material liquid. It is preferable that this gas vent hole is configured to allow gas to escape but not allow resin to enter.

[0051] The tire filling member 50 is removed from the foam molding die 70 as follows. That is, first, the pair of outer dies 71, 72 are opened, and the tire filling member 50 is attached to the insert 73. Then, the support block 73B of the insert 73 is removed from the arc member 73A, and then the arc member 73A is removed from the tire filling member 50. To remove the arc member 73A, first, the arc member 73A is pulled out or pushed out to provide a space at one end of the cavity 25. Then, air is blown into the space, and the arc member 73A is pushed out by the air pressure. This causes the tire filling member 50 to be released from the foam molding die 70. The arc member 73A may be pulled out by gripping one end of the arc member 73A and pulling it out, or by pushing it out with a tool that moves in an arc.

[0052] Incidentally, the pair of outer dies 71, 72 may be configured to be opened after the insert 73 is removed.

[0053] The tire filling member 50 manufactured by the manufacturing method of this embodiment has a hollow portion 25, similar to the tire filling member 10 of the first embodiment, which not only suppresses deterioration of the tire filling member 50 due to heat, but also makes it easier to fill the tire filling member 50.

[0054] In addition, when manufacturing the tire filling member 50, the raw material liquid is injected with the foam molding die 40 placed horizontally, so that the raw material liquid easily reaches the entire circumferential direction of the cavity 71A, and uneven distribution of the foamed resin is suppressed. Moreover, by supplying the raw material liquid onto the insert 73, the insert 73 can be used as a guideline when injecting the raw material liquid.

[0055] [Other embodiments] (1) The tire 81 in which the tire filling member 10, 50 is filled is not limited to a tire for a bicycle, but may be, for example, a tire for a two-wheeled or four-wheeled automobile, a unicycle or rickshaw, or any other vehicle.

[0056] (2) The cross-sectional shape of the tire filling member 10 may be any shape that fits within the annular internal region R. For example, the cross-sectional shape may be a circle or a polygon.

[0057] (3) The shape of the tire filling member 10, 50 does not have to be semicircular, and three or more tire filling members 10, 50 may be filled in the annular internal region R. In addition, the multiple tire filling members 10, 50 arranged in the annular internal region R may each have a different shape.

[0058] (4) The tire filling member 10 of the first embodiment may be annular without any breaks. Even in this case, the tire filling member 10 can be removed from the foam molding die 40 by peeling one side of the slit 16 of the inward protrusion 30 of the tire filling member 10 from the insert 43.

[0059] (5) The tire filling member 10 of the second embodiment may be annular with a cut in one portion. In this case, if the insert 73 is annular with a cut and configured to be deformable so that both ends can be shifted, the tire filling member 10 can be extracted from the shifted portion.

[0060] (6) The insert 73 (arc member 73A) in the second embodiment may be fixed in the cavities 71A and 72A by a pin or the like.

[0061] (7) The insert 73 in the second embodiment may be configured to have no support block 73B and to be made up of only the arc member 73A, with both ends directly held between the pair of outer dies 71, 72.

[0062] (8) As shown in Fig. 24, the insert 73 of the second embodiment may be configured such that the support block 73B has a wire portion 73B1 protruding into the cavities 71A, 72A, and the arc member 73A engages with the wire portion 73B1. In this case, when the tire filling member 50 together with the insert 73 is removed from the pair of outer dies 71, 72 and then the support block 73B is removed, a space is generated at the end of the hollow portion 25, and by blowing air into the space, the arc member 73A can be pushed out by the air pressure.

[0063] <Additional Notes> The following describes the group of features extracted from the above embodiment, while indicating effects, etc., as necessary. Note that, in the following, for ease of understanding, the corresponding configurations in the above embodiment are appropriately indicated in parentheses, but the present invention is not limited to the specific configurations indicated in parentheses.

[0064] For example, the following features relate to "a manufacturing method for a tire filling member to be placed inside a tire" and can be considered to have been achieved with the objective of addressing the problem that "there is a need to suppress deterioration of the manufactured tire filling member due to heat" in the background technology that "conventionally, techniques for filling the inside of a tire with a tire filling member are known (see, for example, JP 2004-9768 A (FIG. 1, etc.))."

[0065] [Feature 1] A method for manufacturing a tire filling member having an annular or arc-shaped overall shape and a hollow portion extending along its entire circumference or entire length, using a foam molding die, comprising the steps of: The foam molding die includes an outer mold having a cavity corresponding to the outer shape of the tire filling member, and a insert corresponding to the hollow portion.

[0066] The tire filling member manufactured by the manufacturing method according to Feature 1 has a hollow portion. Therefore, when the tire filling member is filled into a wheel and used, the tire filling member is repeatedly deformed and the heat generated therefrom can be released into the hollow portion, thereby making it possible to suppress deterioration of the tire filling member due to heat.

[0067] [Feature 2] A pair of the outer dies are structured to open and close in the width direction of the tire filling member, the insert is a plate-like member extending from an inner edge portion to a middle portion in a radial direction into a cavity of the pair of outer dies, 2. The method for producing a tire filling member according to claim 1, wherein the tire filling member is formed with the hollow portion and a slit extending from the hollow portion toward the center in the radial direction.

[0068] In the tire filling member manufactured by the manufacturing method of feature 2, a slit is formed extending from the hollow portion toward the center in the radial direction, so that heat generated in the tire filling member can be released through the slit to the hollow portion.

[0069] [Feature 3] 3. The method for manufacturing a tire filling member according to claim 2, wherein after the tire filling member is removed together with the insert from the pair of outer molds, the tire filling member and the insert are separated in a radial direction of the tire filling member through the slit.

[0070] As in feature 3, after the tire filling member is removed together with the nests from the pair of outer molds, the tire filling member can be separated radially from the nests through the slits, thereby allowing the tire filling member to be demolded from the foam molding die.

[0071] [Feature 4] The pair of outer dies are arranged in such a position that the cavities are parallel to a vertical plane, 4. The method for producing a tire filling member according to claim 2, wherein the raw material liquid is injected into the cavity from a radially outer edge side.

[0072] According to feature 4, it becomes easy to cause the raw material liquid to flow to both sides of the insert.

[0073] [Feature 5] The cavity has an arc shape; 5. The method for producing a tire filling member according to claim 4, wherein the raw material liquid is injected in a position where a radially outer edge side of the cavity is positioned upward.

[0074] According to the feature 5, the raw material liquid can be easily spread throughout the cavity.

[0075] [Feature 6] The insert has a structure in which the wire is curved in a circular or arc shape, The pair of outer dies are structured to hold the insert so that the insert is in a floating state within the inner cavity of the pair of outer dies and to open and close in the width direction of the tire filling member, 2. The method for manufacturing a tire filling member according to claim 1, wherein the tire filling member is demolded from the insert by moving the insert relative to the tire filling member on an arc.

[0076] According to the sixth feature, the cavity can be formed without forming a slit in the tire filling member.

[0077] [Feature 7] 7. The method for manufacturing a tire filling member according to claim 6, wherein air is blown against one end of the insert in the hollow portion, and the insert is pushed out by the air pressure.

[0078] According to feature 7, the nesting can be easily removed.

[0079] [Feature 8] the insert includes a protrusion protruding from an end of the cavity in a circumferential direction, 8. The method for producing a tire filling member according to claim 6, wherein the protruding portion is fixed to the pair of outer molds.

[0080] [Feature 9] 9. The method for manufacturing a tire filling member according to claim 6, further comprising: placing one of the pair of outer molds with the cavity open upward; injecting the raw material liquid into the cavity; and then overlapping the other of the pair of outer molds.

[0081] According to feature 9, the raw material liquid can easily reach the entire circumferential direction of the cavity.

[0082] [Feature 10] 10. The method for producing a tire filling member according to claim 9, wherein the injection of the raw material liquid is carried out by supplying the raw material liquid onto the insert in a state in which the insert is placed in the one of the outer molds.

[0083] As in Feature 10, by supplying the raw material liquid onto the insert, the insert can be used as a guideline when supplying the raw material liquid.

[0084] In addition, although this specification and drawings disclose specific examples of the technology included in the scope of the claims, the technology described in the claims is not limited to these specific examples, but includes various modifications and variations of the specific examples, as well as parts of the specific examples taken alone. [Explanation of symbols]

[0085] 10,50 Tire filling material 16 Slit 20. Torso 25 Cavity 30 Inward protrusion 40 Foam molding mold 40A Inlet 40S occlusion plug 41 First outer mold 41A Cavity 42 Second outer mold 43 Nesting 50 Tire filling materials 70 Foam molding mold 71 First Mold 71A Cavity 72 2nd Mold 72A Cavity 73 Nesting 73A Arc member 73B Support block 80 wheels 81 Tires

Claims

1. A method for manufacturing a tire filling member having an annular or arc-shaped overall shape and a hollow portion extending along its entire circumference or entire length, using a foam molding die, comprising the steps of: the foam molding die has a cavity corresponding to the outer shape of the tire filling member, and is provided with a pair of outer dies that open and close in the width direction of the tire filling member, and a nesting member that corresponds to the hollow portion, the insert is a plate-like member extending from an inner edge portion to a middle portion in a radial direction into a cavity of the pair of outer dies, The tire filling member manufacturing method includes forming, in the tire filling member, the hollow portion and a slit extending from the hollow portion toward the center in the radial direction.

2. A method for manufacturing a tire filling member as described in claim 1, wherein after the tire filling member together with the nest is removed from the pair of outer molds, the tire filling member and the nest are separated in the radial direction of the tire filling member through the slit.

3. The pair of outer molds are arranged in a position such that the cavity is parallel to a vertical plane, 3. The method for manufacturing a tire filling member according to claim 1, wherein the raw material liquid is injected into the cavity from a radially outer edge side.

4. The cavity has an arc shape, The method for manufacturing a tire filling member according to claim 3 , wherein the injection of the raw material liquid is performed in a position in which a radially outer edge side of the cavity is positioned upward.

5. A method for manufacturing a tire filling member having an arc-shaped interior cavity extending along its entire length using a foam molding die, comprising: the foam molding die has a cavity corresponding to the outer shape of the tire filling member, and is provided with a pair of outer dies that open and close in the width direction of the tire filling member, and a nesting member that corresponds to the hollow portion, The insert has a structure in which the wire is curved in an arc shape, The pair of outer dies are structured to hold the insert so that the insert is suspended within their internal cavities, The tire filling member manufacturing method includes: removing the tire filling member from the insert by moving the insert relative to the tire filling member on an arc.

6. A method for manufacturing a tire filling member as described in claim 5, in which air is blown into one end of the insert within the hollow portion, and the insert is pushed out by the air pressure.

7. The insert has a protrusion protruding from a circumferential end of the cavity, The method for manufacturing a tire filling member according to claim 5 or 6, wherein the protrusion is fixed to the pair of outer molds.

8. A method for manufacturing a tire filling member as described in any one of claims 5 to 7, comprising: one of the pair of outer molds being arranged with the cavity open upward, and after raw material liquid is injected into the cavity, the other of the pair of outer molds being superimposed thereon.

9. A method for manufacturing a tire filling member as described in Claim 8, wherein the injection of the raw material liquid is carried out by supplying the raw material liquid onto the insert while the insert is placed on one of the outer molds.

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