Airless tire manufacturing method and manufacturing device

Abstract

In the present invention: so that a first distance (D1) between the center (C1) of a wheel (11) and another end (E1) of a spoke (13) joined to the wheel (11) at one end is decreased, a first force in a radial direction toward the center of the wheel (11) is applied to a plurality of spokes (13); the wheel (11), in a state where the first force is applied to the plurality of spokes (13), and a tread (12) are disposed so that a first inner peripheral surface (124) and the other ends (E1) face one another; and the first force applied to the plurality of spokes (13) is removed. Moreover, in the present invention: so that a second distance (D2) between the center (C2) of an inner peripheral ring (15) and another end (E2) of a spoke (13) joined to the inner peripheral ring (15) at one end is decreased, a third force in a radial direction of the inner peripheral ring (15) and a fourth force opposite in direction to the third force are applied to a plurality of spokes (13); the inner peripheral ring (15), in a state where the third force and the fourth force are applied to the plurality of spokes (13), and a tread (12) are disposed so that the other ends (E2) of the spokes and a first inner peripheral surface (124) of the tread (12) face one another; and the third force and the fourth force applied to the plurality of spokes (13) are removed.

Description

Airless tire manufacturing method and manufacturing device

[0001] The present invention relates to a method and an apparatus for manufacturing an airless tire (also called a non-pneumatic tire or a non-pneumatic tire).

[0002] Patent Document 1 discloses an airless tire having a base connected to a rigid portion, a top joined to a tire tread, and a deformable structure provided between the base and the top. The deformable structure is formed by, for example, injection molding of polyurethane.

[0003] Japanese Patent Application Publication No. 3-208702

[0004] In some airless tires, reinforcing materials (e.g., metal wires) are provided in the tread along the circumferential direction of the airless tire to prevent excessive deformation of the spokes. In this case, a force is applied to the reinforcing materials from the inner circumferential side toward the outer circumferential side of the airless tire, generating tensile stress in the circumferential direction and increasing the rigidity of the reinforcing materials.

[0005] However, in airless tires manufactured using the above-mentioned conventional technology, the force acting from the base to the tread weakens due to shrinkage of the injected polyurethane, making it impossible to increase the rigidity of the reinforcing material and preventing excessive deformation of the deformable structure corresponding to the spokes.

[0006] The problem to be solved by the present invention is to provide a manufacturing method and manufacturing apparatus that can manufacture an airless tire that suppresses excessive deformation of the spokes.

[0007] The present invention solves the above problem by applying a first force toward the radial center of the wheel to multiple spokes so that a first distance between the center of the wheel and the other end of each spoke joined to the wheel is reduced, and then arranging the tread and the wheel with the first force applied to the multiple spokes so that the first inner surface faces the other end, and then removing the first force applied to the multiple spokes.

[0008] The present invention also solves the above problem by applying a third force in the radial direction of the inner ring and a fourth force in the opposite direction to the third force to a plurality of spokes so that a second distance between the center of the inner ring and the other end of each spoke, one end of which is joined to the inner ring, is reduced; the tread and the inner ring with the third and fourth forces applied to the plurality of spokes are positioned so that the other ends of the spokes face the first inner surface of the tread; and removing the third and fourth forces applied to the plurality of spokes.

[0009] According to the present invention, an airless tire can be manufactured in which excessive deformation of the spokes is suppressed.

[0010] 1 is a front view showing an example of an airless tire according to an embodiment of the present invention. FIG. 2 is a perspective view showing an example of the wheel shown in FIG. 1. FIG. 3 is a front view showing another example of an airless tire according to an embodiment of the present invention. FIG. 4 is a cross-sectional view of a main portion showing an outer ring and a tread along the A-A cross section of FIG. 3. FIG. 5 is a perspective view showing an example of an airless tire manufacturing apparatus according to an embodiment of the present invention. FIG. 6 is a plan view (part 1) showing a procedure for routing the wheel and the tread in the manufacturing apparatus shown in FIG. 5. FIG. 7 is a plan view (part 2) showing a procedure for routing the wheel and the tread in the manufacturing apparatus shown in FIG. 7. FIG. 8 is a plan view (part 3) showing a procedure for routing the wheel and the tread in the manufacturing apparatus shown in FIG. 7. FIG. 9 is a front view showing an example of a spoke of an airless tire according to an embodiment of the present invention. FIG. 10 is a front view showing another example of a spoke of the airless tire according to the embodiment of the present invention.

[0011] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. For convenience of explanation, the side (outside) of a vehicle when an airless tire is mounted on the vehicle is defined as the front side. In the drawings, "front," "rear," "upper," "lower," "right," and "left" respectively indicate the front, rear, upper, lower, right, and left of a vehicle mounted with the airless tire. The X and Y axes respectively indicate the horizontal and vertical directions when an airless tire manufacturing apparatus (hereinafter simply referred to as the manufacturing apparatus) is viewed from above. The Z axis indicates the height direction relative to the installation position of the manufacturing apparatus. In the following explanation, the radial direction of the airless tire will be simply referred to as the "radial direction," and the circumferential direction of the airless tire will be simply referred to as the "circumferential direction." The radial direction of the airless tire will be the same as the radial direction of the wheel and the inner ring, and the circumferential direction of the airless tire will be the same as the circumferential direction of the wheel and the inner ring.

[0012] [Configuration of Airless Tire] Fig. 1 is a front view showing an example of an airless tire according to an embodiment of the present invention. An airless tire is a tire that supports a vehicle body not by air pressure but by the reaction force of spokes made of an elastic material (hereinafter also referred to as an elastic material). The airless tire of this embodiment can be applied to four-wheeled automobiles, two-wheeled automobiles, industrial vehicles, bicycles, and other vehicles, as well as carts and the like. As shown in Fig. 1, the airless tire 1 of this embodiment includes a wheel 11, a tread 12, spokes 13, and an intermediate ring 14.

[0013] The wheel 11 is a component that is fixed to a vehicle hub (not shown) to connect to the vehicle, and is made of metal or other highly rigid material. As shown in FIG. 2 , the wheel 11 is made up of a disk 111 and a cylindrical rim 112. The disk 111 is shown in FIG. 1 as a circular component located in the center of the airless tire 1, and the disk 111 is fixed to the vehicle hub to support the airless tire 1 on the axle. The shape of the wheel 11 can be set appropriately depending on the required specifications of the airless tire 1. The disk 111 and the rim 112 may be molded integrally, or may be molded separately and then combined.

[0014] The tread 12 is a cylindrical member having a tire width, and is disposed on the outermost periphery of the airless tire 1 to come into contact with the road surface. The tread 12 is made of a composite material in which an elastic material such as natural rubber or synthetic rubber is reinforced with metal or resin tire cords. A tread pattern is formed on the outer peripheral surface of the tread 12, similar to that of a conventional pneumatic tire, and forms the contact surface with the road surface. The inner diameter, outer diameter, thickness, and shape of the tread pattern of the tread 12 can be set as appropriate according to the required specifications of the airless tire 1.

[0015] The spokes 13 are members that support a load (e.g., the vehicle weight) applied to the airless tire 1, and are plate-like members made of an elastic material such as an elastic thermoplastic resin or an elastic thermosetting resin, with a width corresponding to the tire width. The spokes 13 extend radially from the outer periphery of the wheel 11 (specifically, the outer periphery of the rim 112) toward the inner periphery of the tread 12, and are provided in plurality at equal intervals and spaced apart from one another along the circumferential direction of the airless tire 1. The spokes 13 are provided axially symmetrically with respect to the central axis of the airless tire 1. There are no particular limitations on the number of spokes 13 provided on one airless tire 1, and this number can be set appropriately depending on the ground contact length of the airless tire 1, the load-bearing value of the spokes 13, vibration resistance, and other required specifications of the airless tire 1.

[0016] The means for attaching the spokes 13 to the wheel 11 is not particularly limited as long as it ensures robustness. For example, grooves may be formed in the outer peripheral surface (hereinafter also referred to as the first outer peripheral surface) of the rim 112 that constitutes the wheel 11, and the inner peripheral ends (hereinafter also referred to as the one ends) of the spokes 13 may be fitted into these grooves. Alternatively, the first outer peripheral surface and the one ends may be bonded together with an adhesive, or they may be fastened together with bolts. Similarly, the means for attaching the spokes 13 to the tread 12 is not particularly limited as long as it ensures robustness. For example, the inner peripheral surface (hereinafter also referred to as the first inner peripheral surface) of the tread 12 and the outer peripheral ends (hereinafter also referred to as the other ends) of the spokes 13 may be bonded together with an adhesive, or they may be fastened together with bolts.

[0017] The intermediate ring 14 is a component that transmits circumferential deformation of the spokes 13 to adjacent spokes 13 when the spokes 13 are deformed by a radial load, so that the entire airless tire 1 can support the load. Like the spokes 13, the intermediate ring 14 is made of an elastic material such as an elastic thermoplastic resin or an elastic thermosetting resin. The intermediate ring 14 has a cylindrical shape concentric with the wheel 11 and the tread 12, and is provided between the wheel 11 and the tread 12 to connect the multiple spokes 13. The means for attaching the intermediate ring 14 to the spokes 13 is not particularly limited as long as robustness can be ensured. For example, the intermediate ring 14 is bonded to the spokes 13 with an adhesive. Alternatively, the spokes 13 and the intermediate ring 14 may be integrally molded. Although the airless tire 1 shown in FIG. 1 has three intermediate rings 14a, 14b, and 14c, the number of intermediate rings 14 provided in one airless tire 1 is not particularly limited.

[0018] Fig. 3 is a front view showing another example of an airless tire according to an embodiment of the present invention. The airless tire 1a shown in Fig. 3 includes a wheel 11, a tread 12, spokes 13, an intermediate ring 14, an inner ring 15, and an outer ring 16.

[0019] The inner ring 15 is an annular member that connects one ends of the multiple spokes 13 and is made of, for example, the same material as the spokes 13. The inner side of the inner ring 15 is bonded to the outer side of the wheel 11. For example, protrusions may be provided on the inner surface of the inner ring 15 (hereinafter also referred to as the third inner surface) and the protrusions may be fitted into grooves formed in the first outer surface. Alternatively, the third inner surface and the first outer surface may be bonded together with an adhesive. The outer side of the inner ring 15 is also bonded to the spokes 13. For example, one end of the spokes 13 is bonded to the outer surface of the inner ring 15 (hereinafter also referred to as the third outer surface) with an adhesive. The inner ring 15 may be integrally molded with the spokes 13.

[0020] The outer ring 16 is an annular member that connects the other ends of the multiple spokes 13 and is made of, for example, the same material as the spokes 13. The outer side of the outer ring 16 is bonded to the inner side of the tread 12. For example, an adhesive is used to bond the outer surface (hereinafter also referred to as the second outer surface) of the outer ring 16 to the first inner surface. The inner side of the outer ring 16 is bonded to the spokes 13. For example, an adhesive is used to bond the other ends of the spokes 13 to the inner surface (hereinafter also referred to as the fourth inner surface) of the outer ring 16. The outer ring 16 may be molded integrally with the spokes 13. Alternatively, the spokes 13, the inner ring 15, and the outer ring 16 may be molded integrally, or the spokes 13, the intermediate ring 14, the inner ring 15, and the outer ring 16 may be molded integrally.

[0021] By providing the inner ring 15, the contact area with the rim 112 is increased compared to when the spokes 13 are directly connected to the wheel 11, improving the load-bearing capacity of the airless tire 1a. Similarly, by providing the outer ring 16, the contact area with the tread 12 is increased compared to when the spokes 13 are directly connected to the tread 12, improving the load-bearing capacity of the airless tire 1a. The inner ring 15 and the outer ring 16 have a width equivalent to the tire width (for example, a width within a range of tire width ±5%) and an appropriate thickness according to the required specifications of the airless tire 1a.

[0022] If the airless tire includes an inner circumferential ring 15, the spokes 13 extend radially from the third outer circumferential surface toward the first inner circumferential surface, connecting the inner circumferential ring 15 and the tread 12. If the airless tire includes an outer circumferential ring 16, the spokes 13 extend radially from the first outer circumferential surface toward the fourth inner circumferential surface, connecting the wheel 11 and the outer circumferential ring 16. If the airless tire includes an inner circumferential ring 15 and an outer circumferential ring 16 like the airless tire 1a shown in Fig. 3, the spokes 13 extend radially from the third outer circumferential surface toward the fourth inner circumferential surface, connecting the inner circumferential ring 15 and the outer circumferential ring 16.

[0023] Fig. 4 is a cross-sectional view of a main portion of the outer ring 16 and the tread 12 taken along the line A-A in Fig. 3, which is a cross-section perpendicular to the circumferential direction of the airless tire 1a. The tread 12 shown in Fig. 4 comes into contact with the road surface and includes a first elastic portion 121 made of an elastic material and a first reinforcing layer 122 extending in the width direction of the tread 12 (the left-right direction of the vehicle). The first reinforcing layer 122 includes tire cords 122a and hard rubber, and has higher rigidity than the first elastic portion 121 made of an elastic material. In addition, in order to facilitate the generation of circumferential tensile stress in the tire cords 122a, the first reinforcing layer 122 is positioned closer to the first inner circumferential surface 124 than the contact surface 123 that comes into contact with the road surface.

[0024] On the other hand, the outer ring 16 shown in Fig. 4 has a second elastic portion 161 made of an elastic material and a second reinforcing layer 162 extending in the width direction of the outer ring 16 (the left-right direction of the vehicle). The second reinforcing layer 162 includes tire cords 162a, hard rubber, etc., and has higher rigidity than the second elastic portion 161. Like the airless tire 1a shown in Fig. 4, the tread 12 of the airless tire 1 shown in Fig. 1 also has a first elastic portion 121 and a first reinforcing layer 122.

[0025] The intermediate ring 14, the inner ring 15, and the outer ring 16 are not essential components of the airless tire according to the embodiment of the present invention, and may be provided as needed or may be omitted.

[0026] [Manufacturing Method of Airless Tire] In a manufacturing method of an airless tire according to an embodiment of the present invention, a wheel 11 and a tread 12 are prepared, and an airless tire is manufactured by assembling the wheel 11 and the tread 12. The wheel 11 includes a plurality of radially deformable spokes 13 extending radially from a first outer peripheral surface to which one end is joined, with the distance between the center of the wheel 11 and the other end being a predetermined distance longer than the radius of the first inner peripheral surface 124. When assembling the wheel 11 and the tread 12, the plurality of spokes 13 are deformed circumferentially and / or radially so as to reduce the distance between the center of the wheel 11 and the other end (e.g., to be less than the radius of the first inner peripheral surface 124), and the tread 12 and the plurality of spokes 13 in a deformed state are arranged so that the other ends face the first inner peripheral surface, and the deformed plurality of spokes 13 are then returned to their pre-deformed state. Two embodiments of the manufacturing method of an airless tire are described below. First Embodiment

[0027] Fig. 5 is a perspective view showing an example of a manufacturing apparatus according to an embodiment of the present invention. The manufacturing apparatus 2 shown in Fig. 5 is an apparatus for manufacturing an airless tire that does not have an inner peripheral ring 15 and in which the spokes 13 are directly joined to the wheel 11, like the airless tire 1 shown in Fig. 1. As shown in Fig. 5, the manufacturing apparatus 2 includes a first base 21, a fixing member 22, a first moving member 23, a first pin 24, and conveying mechanisms 25 and 26.

[0028] The first pedestal 21 is a member that supports the devices that constitute the manufacturing apparatus 2. The first pedestal 21 is installed, for example, on horizontal ground and is fixed in position by anchor bolts or the like. The first pedestal 21 has an appropriate shape and rigidity within a range that allows it to appropriately support the devices that constitute the manufacturing apparatus 2.

[0029] The fixing member 22 is a member that fixes the wheel 11 to the first base 21, and is not particularly limited as long as it can fix the wheel 11 to the first base 21. As an example, the fixing member 22 shown in Fig. 5 is provided in the center of the first base 21 and has a base portion that is fixed to the first base 21 (or is part of the first base 21), and a pin that is inserted into a hole provided in the disc 111. The hole in the disc 111 is a hole through which a bolt is inserted when connecting the wheel 11 to a vehicle. When the wheel 11 is fixed by the fixing member 22 shown in Fig. 5, the Z-axis direction is the width direction of the wheel 11.

[0030] The first moving members 23 are members attached to the first base 21 and are movable in the radial direction of the wheel 11 fixed to the fixed member 22. For example, six first moving members 23 are attached to the first base 21 shown in Fig. 5, and each of the six first moving members 23 moves independently in the radial direction on an XY plane perpendicular to the Z axis. The first moving members 23 include, for example, a worm gear (not shown) extending in the radial direction, and the first moving members 23 are moved in the radial direction by rotating the worm gear by a motor or the like.

[0031] The first pins 24 are fixed to the first moving members 23 along the circumferential direction. As shown in FIG. 5 , multiple first pins 24 are fixed to each first moving member 23. One end of each first pin 24 is fixed to the first moving member 23 and extends in the Z-axis direction (the width direction of the wheel 11). The method for fixing the first pins 24 to the first moving members 23 is not particularly limited. They may be fixed using bolts or adhesive, or the first moving members 23 and the first pins 24 may be integrally molded. Because the first pins 24 apply a first force to the spokes 13 in the radial direction (specifically, toward the center in the radial direction), they have an appropriate shape and rigidity within a range that can deform the spokes 13 made of an elastic material. The arrangement of the first pins 24 can be appropriately set within a range that can appropriately deform the spokes 13, and the shape of the first moving members 23 depends on the arrangement of the first pins 24. The first force will be described later.

[0032] The transport mechanism 25 is a mechanism for transporting the tread 12, and is not particularly limited as long as it can appropriately position the tread 12 in the manufacturing apparatus 2. As an example, the transport mechanism 25 shown in FIG. 5 is a cylindrical member, and a support portion 25a for supporting the tread 12 is provided at the lower end on the inner periphery side of the transport mechanism 25. The transport mechanism 25 is moved in the X-axis direction, Y-axis direction, and Z-axis direction by an arm (not shown) or the like provided above the manufacturing apparatus 2. Meanwhile, the transport mechanism 26 is a mechanism for transporting the wheel 11 and the inner circumferential ring 15, and removes the manufactured airless tire 1 from the manufacturing apparatus 2. The transport mechanism 26 is, for example, a robot arm as shown in FIG. 5, but is not particularly limited as long as it can appropriately handle the wheel 11 and the like.

[0033] When manufacturing the airless tire 1 shown in FIG. 1 using the manufacturing apparatus 2 shown in FIG. 5 , first, a wheel 11 including a plurality of spokes 13 extending radially from a first outer peripheral surface to which one end is joined and deformable in the radial direction of the wheel 11, and a tread 12 are prepared (step S1). The wheel 11 including the spokes 13 is manufactured by integrally molding the spokes 13 and an intermediate ring 14 made of an elastic material (e.g., a urethane resin such as thermoplastic polyurethane) using a molding method such as injection molding or vacuum casting, and then joining one end of the spokes 13 to the first outer peripheral surface of the disk 111. As described above, the method of joining the one end of the spokes 13 to the first outer peripheral surface is not particularly limited as long as robustness can be ensured. Alternatively, the wheel 11 may be inserted into a mold and integrally molded (insert molding) together with the spokes 13 and the intermediate ring 14. On the other hand, the tread 12 is manufactured, for example, by wrapping the tire cord 122a corresponding to the first reinforcing layer 122 with raw rubber corresponding to the first elastic portion 121 to form a prepreg, and then heating and pressurizing (vulcanizing) the prepreg.

[0034] The shapes of the spokes 13 and the intermediate ring 14 can be appropriately set within a range in which the spokes 13 can be deformed radially by the first pins 24. The diameter of the wheel 11 and the lengths of the spokes 13 are set so that a first distance from the center of the wheel 11 to the other ends of the multiple spokes 13 is longer than the radius of the first inner circumferential surface by a first predetermined distance. As an example, in the wheel 11 and spokes 13 shown in FIG. 6A , a first distance D1 from the center C1 of the wheel to the other ends E1 of the spokes 13 is set so that it is longer than the radius B of the first inner circumferential surface 124 by a first predetermined distance, as shown in FIG. 6B . The first predetermined distance can be set to an appropriate value within a range in which the other ends E1 of the spokes 13 can be pressed against the first inner circumferential surface 124 to fix the spokes 13 to the tread 12, for example, 5 to 10% of the radius B of the first inner circumferential surface 124.

[0035] Next, a conveying mechanism 26 shown by dashed lines in Fig. 6A conveys the wheel 11 having a plurality of spokes 13, and the pins of the fixing member 22 are inserted into the holes in the disk 111 to fix the wheel 11 to the fixing member 22 (step S2). In the manufacturing apparatus 2, the first pins 24 are disposed between adjacent spokes 13, and therefore, when fixing the wheel 11 to the fixing member 22, the first pins 24 are inserted between adjacent spokes 13 as shown in Fig. 6A. Note that the number of first pins 24 does not necessarily have to be the same as the number of spokes 13; for example, the first pins 24 may be disposed between every other adjacent spoke 13.

[0036] Next, a first radial force is applied to the plurality of spokes 13 so that the first distance D1 shown in FIG. 6A is less than the radius B of the first inner circumferential surface 124 shown in FIG. 6B (step S3). As an example, in the manufacturing apparatus 2, the first moving member 23 is moved radially toward the center C1 (in the direction of the arrow shown in FIG. 6A ), and the first force is applied to the plurality of spokes 13 via the intermediate ring 14c that contacts the first pin 24 so that the first distance D1 for all of the spokes 13 is less than the radius B of the first inner circumferential surface 124. Specifically, the first force is applied to the spokes 13 by applying a second radial force to the intermediate ring 14c. By applying the first force to the spokes 13 shown in FIG. 6A , the spokes 13 are deformed, shortening their radial length (reducing their diameter), and as shown in FIG. 6B, the first distance D1 becomes shorter than the radius B of the first inner circumferential surface 124.

[0037] 5 uses pins to apply the first force, but the means for applying force to the spokes 13 is not limited to pins. For example, the spokes 13 may be held by a clamp or the like, and the clamp holding the spokes 13 may be moved in the radial direction. Furthermore, the radial length of the spokes 13 to which the first force is applied may differ for each spoke 13. The direction of the arrow shown in FIG. 6A is also referred to as the first direction.

[0038] Regarding the spokes 13 and the intermediate ring 14, the spokes 13 may have multiple bent portions between one end and the other end that bend in the direction connecting the one end and the other end. For example, the spoke 13 shown in FIG. 6A has bent portions 131, 132, and 133 that deform in the circumferential direction between one end and the other end. The intermediate ring 14 may also connect the bent portions of the spokes 13 to each other. For example, the intermediate ring 14a shown in FIG. 6A connects the bent portion 131 to bent portions 131a and 131b of adjacent spokes 13. As shown in FIG. 6A , by applying a second force to the intermediate ring 14 that connects the bent portions of the spokes 13 to each other, the diameter of the spokes 13 can be reduced with a smaller force.

[0039] If the airless tire 1 includes an intermediate ring 14, the circumferential and radial deformations of the spokes 13 are transmitted by the intermediate ring 14 to adjacent spokes 13. Therefore, when applying the second force to the intermediate ring 14 to make the first distance D1 less than the radius B of the first inner circumferential surface 124, the second force may be applied to only a portion of the intermediate ring 14. For example, every other first pin 24 shown in FIG. 5 may be thinned out so that every other first pin 24 is disposed between adjacent spokes 13. This makes it possible to prevent the diameter of the spokes 13 from being reduced more than necessary.

[0040] If the direction connecting one end of the spoke 13 to the other end E1 forms a minor angle within a predetermined range with the radial direction of the wheel 11, a first protrusion may be provided on the spoke 13, and a first force may be applied to the first protrusion. FIG. 9A is a front view showing an example of a spoke 13 of an airless tire according to an embodiment of the present invention. The wheel 11 shown in FIG. 9A includes a plurality of spokes 13 and an outer ring 16, with a tread 12 joined to the outer ring 16. The spoke 13 shown in FIG. 9A has a first protrusion P1, and a first pin 24 contacts the first protrusion P1. As shown in FIG. 9A , the radial direction A1 and the direction A2 connecting one end of the spoke 13 to the other end form a minor angle α within a predetermined range. In this case, when applying the first force to the spoke 13, the first force is applied to the first protrusion P1. The shape of the first protrusion P1 and the predetermined range of the minor angle α can be set as appropriate within a range in which the first force can be appropriately applied to the first protrusion P1. The predetermined range is, for example, 10 to 30 degrees.

[0041] Next, the tread 12 is transported using the transport mechanism 25 shown by dashed lines in Figure 6B, and the tread 12 and the wheel 11 in a state in which the first force is applied to the multiple spokes 13 are positioned so that the first inner circumferential surface 124 faces the other end E1 (step S4). As an example, in the manufacturing apparatus 2, as shown in Figure 6B, the transport mechanism 25 in a state in which the tread 12 is supported on the support portion 25a is moved from above to below the manufacturing apparatus 2 along the Z-axis direction, and the tread 12 is positioned outside the multiple spokes 13 in a state in which the first force is applied so that the first inner circumferential surface 124 faces the other end E1. Before moving the transport mechanism 25 along the Z-axis direction, the transport mechanism 26 moves to a position that does not obstruct the movement of the transport mechanism 25.

[0042] Next, with the wheel 11 and tread 12 positioned such that the first inner circumferential surface 124 and the other ends E1 of the spokes 13 face each other, the first force applied to the spokes 13 is removed, and the other ends E1 of the spokes 13 are pressed against the first inner circumferential surface 124 to secure the spokes 13 to the tread 12 (step S5). As an example, with the manufacturing apparatus 2, as shown in FIG. 6B , with the tread 12 positioned such that the first inner circumferential surface 124 and the other ends E1 face each other, the first moving member 23 is moved radially toward the first inner circumferential surface 124 (in the direction of the arrow shown in FIG. 6B ) to remove the first force from the spokes 13. With the first force removed from the spokes 13 as shown in FIG. 6C , the first distance D1 is longer than the radius B of the first inner circumferential surface 124, and therefore the other ends E1 of the spokes 13 are pressed against the first inner circumferential surface 124 and fixed to the first inner circumferential surface 124. Furthermore, the other ends E1 of the spokes 13 are pressed against the first inner circumferential surface 124, which generates circumferential tensile stress in the tire cords 122a of the tread 12. Note that the first direction of the arrow shown in Fig. 6A and the direction of the arrow shown in Fig. 6B are opposite to each other.

[0043] The airless tire 1 manufactured by combining the wheel 11 and the tread 12 is removed from the manufacturing apparatus 2 using the transport mechanism 26 (step S6). The removed airless tire 1 is transported to the next step. The transport mechanism 26 then transports a new wheel (step S7). Steps S2 to S7 are repeated until the desired number of airless tires 1 are manufactured. Furthermore, if a wheel 11 and a tread 12 are required, step S1 is executed as needed.

[0044] In addition to the plurality of spokes 13, the wheel 11 may include an outer ring 16 having a second outer peripheral surface with a second diameter that is longer by a first predetermined length than the first diameter of the first inner peripheral surface 124. The first predetermined length can be set to an appropriate value within a range in which the second outer peripheral surface can be pressed against the first inner peripheral surface 124 and the outer peripheral ring 16 can be fixed to the tread 12, and is, for example, 2.5 to 5% of the first diameter of the first inner peripheral surface 124. The first predetermined length may also be simply referred to as the predetermined length.

[0045] When the wheel 11 includes an outer ring 16, the manufacturing apparatus 2 applies a first force to the spokes 13 so that the maximum diameter of the second outer peripheral surface is less than the first diameter (step S3a). The tread 12 and the wheel 11 with the first force applied to the spokes 13 are then positioned so that the first inner peripheral surface 124 faces the second outer peripheral surface (step S4a). The first force applied to the spokes 13 is then removed, and the second outer peripheral surface is pressed against the first inner peripheral surface 124 to closely contact the first inner peripheral surface 124 (step S5a). In other words, when the wheel 11 includes an outer ring 16, in step S1, a wheel 11 including the spokes 13 and the outer ring 16 is prepared, and steps S3 to S5 are replaced with steps S3a to S5a. In step S3a, the diameter of the second outer peripheral surface does not need to be uniformly reduced; it is sufficient that the maximum diameter of the second outer peripheral surface is less than the first diameter.

[0046] As an example, in the manufacturing apparatus 2, the wheel 11 including the spokes 13 and the outer ring 16 is fixed to the fixed member 22 by the conveying mechanism 26, the first movable member 23 is moved in a first direction on the XY plane, and a second force is applied to the intermediate ring 14c in contact with the first pin 24 so that the maximum value of the diameter of the second outer peripheral surface is less than the first diameter. Then, the conveying mechanism 25, with the tread 12 supported on the support portion 25a, is moved from above to below the manufacturing apparatus 2 along the Z axis direction, and the tread 12 is positioned outside the multiple spokes 13 to which the first force is applied so that the first inner peripheral surface 124 faces the second outer peripheral surface. The first movable member 23 is then moved in a direction opposite to the first direction on the XY plane to remove the first force from the spokes 13.

[0047] When the contact surface 123 of the tread 12 is worn, the tread 12 of the airless tire 1 is replaced with another tread using the manufacturing apparatus 2. For example, with the transport mechanism 25 moved downward in the Z-axis direction as shown in FIG. 6B , the wheel 11 of the airless tire 1 is fixed to the fixing member 22 by the transport mechanism 26. Next, the first moving member 23 is moved in the first direction to apply a second force to the intermediate ring 14c so that the first distance D1 is less than the radius B of the first inner circumferential surface 124, thereby separating the multiple spokes 13 fixed to the tread 12 from the tread 12. The tread 12 separated from the multiple spokes 13 is transported by the transport mechanism 25 to the next process (e.g., a retreading process).

[0048] Next, another tread different from the separated tread 12 is placed on the support portion 25a of the transport mechanism 25, and the transport mechanism 25 is moved to position the other tread and the wheel 11 with the first force applied to the plurality of spokes 13 (with the second force applied to the intermediate ring 14c) so that the inner circumferential surface of the other tread (hereinafter also referred to as the second inner circumferential surface) faces the other end E1. Then, the first moving member 23 is moved in the direction opposite to the first direction to remove the first force applied to the plurality of spokes 13 and fix the plurality of spokes 13 to the other tread. The airless tire 1 with the replaced tread 12 is removed from the manufacturing apparatus 2 by the transport mechanism 26.

[0049] When the wheel 11 includes an outer ring 16 and the tread 12 of the airless tire 1 is replaced with another tread using the manufacturing apparatus 2, the wheel 11 is fixed to the fixing member 22, and then the first movable member 23 is moved in a first direction to apply a second force to the intermediate ring 14c so that the maximum diameter of the second outer peripheral surface is less than the first diameter, thereby separating the multiple spokes 13 fixed to the tread 12 from the tread 12. Next, a tread different from the separated tread 12 is placed on the support portion 25a of the conveying mechanism 25, and the conveying mechanism 25 is moved to position the different tread and the wheel 11 in a state in which the first force is applied to the multiple spokes 13 (a state in which the second force is applied to the intermediate ring 14c) so that the second inner peripheral surface and the second outer peripheral surface face each other. The first movable member 23 is then moved in a direction opposite to the first direction to remove the first force applied to the multiple spokes 13, thereby fixing the second outer peripheral surface to the different tread.

[0050] Second Embodiment Figure 7 is a perspective view showing another example of a manufacturing apparatus according to an embodiment of the present invention. The manufacturing apparatus 3 shown in Figure 7 is an apparatus for manufacturing an airless tire that has an inner circumferential ring 15 and whose spokes 13 are not directly joined to the wheel 11, like the airless tire 1a shown in Figure 3. As shown in Figure 7, the manufacturing apparatus 3 includes a second base 31, a second moving member 32, a third moving member 33, a second pin 34, a third pin 35, and conveying mechanisms 36 and 37.

[0051] The second pedestal 31 is a member that supports the devices that make up the manufacturing apparatus 3, and is fixed in position similarly to the first pedestal 21. The second pedestal 31 has an appropriate shape and rigidity within a range that allows it to appropriately support the devices that make up the manufacturing apparatus 3.

[0052] The second moving member 32 and the third moving member 33 are members attached to the second base 31 and are movable in the radial direction relative to the second base 31. For example, the second moving member 32 and the third moving member 33 shown in FIG. 7 move in the radial direction on an XY plane perpendicular to the Z axis. The mechanism by which the second moving member 32 and the third moving member 33 move is the same as that of the first moving member 23. Furthermore, as shown in FIG. 7, the third moving member 33 is disposed outward of the second moving member 32.

[0053] The second pins 34 are pins fixed to the second moving member 32 along the circumferential direction, and as shown in FIG. 7 , a plurality of second pins 34 are fixed to the second moving member 32. One end of each second pin 34 is fixed to the second moving member 32 and extends in the Z-axis direction. The method for fixing the second pins 34 is not particularly limited. Alternatively, the second moving member 32 and the second pins 34 may be integrally molded. On the other hand, the third pins 35 are pins fixed to the third moving member 33 along the circumferential direction, and as shown in FIG. 7 , a plurality of third pins 35 are fixed to the third moving member 33. One end of each third pin 35 is fixed to the third moving member 33 and extends in the Z-axis direction. The method for fixing the third pins 35 is not particularly limited. Alternatively, the third moving member 33 and the third pins 35 may be integrally molded.

[0054] The second pins 34 and the third pins 35 are pins that apply a third and fourth radial force to the spokes 13, respectively, and therefore have an appropriate shape and rigidity within a range that allows the spokes 13, which are made of an elastic material, to deform. The arrangement of the second pins 34 and the third pins 35 can be set appropriately within a range that allows the spokes 13 to deform appropriately, and the radial spacing between the second pins 34 and the third pins 35 can be set appropriately within a range that allows the spokes 13 to deform appropriately. The shapes of the second moving member 32 and the third moving member 33 depend on the arrangement of the second pins 34 and the third pins 35, respectively. The third force and the fourth force will be described later.

[0055] Similar to the transport mechanism 25, the transport mechanism 36 is a mechanism for transporting the tread 12, and has a support portion 36a that supports the tread 12. Similarly to the transport mechanism 26, the transport mechanism 37 is a mechanism for transporting the wheel 11 and the inner ring 15.

[0056] When manufacturing an airless tire shown in FIG. 1 in which one ends of the spokes 13 are connected by an inner ring 15 using the manufacturing apparatus 3 shown in FIG. 7 , first, a wheel 11, a tread 12, and an inner ring 15 having a third outer peripheral surface to which one ends of the spokes 13 are connected are prepared (step S11). When the manufacturing apparatus 3 is used to join the tread 12 and the inner ring 15 and the wheel 11 and the inner ring 15 are joined separately, the tread 12 and the inner ring 15 having a third outer peripheral surface are prepared in step S11. The inner ring 15 has a plurality of spokes 13 that extend radially from the third outer peripheral surface to which one ends are joined and are deformable in the radial direction of the inner ring 15. The diameter (inner diameter) of the inner ring 15 is set to be shorter than the diameter (outer diameter) of the wheel 11 by a second predetermined length. The second predetermined length can be set to an appropriate value within a range in which the third inner circumferential surface can be appropriately joined to the first outer circumferential surface, and is, for example, 1 to 5% of the diameter of the wheel 11. The inner circumferential ring 15 is integrally molded together with the spokes 13 and intermediate ring 14, which are made of an elastic material, using a molding method such as injection molding or vacuum casting. The manufacturing method of the tread 12 is the same as that of the first embodiment, and therefore will not be described here.

[0057] The shapes of the spokes 13 and the intermediate ring 14 can be set appropriately within a range in which the spokes 13 can be deformed radially by the second pins 34 and the third pins 35. The outer diameter of the inner ring 15 (i.e., the diameter of the third outer peripheral surface) and the lengths of the spokes 13 are set so that a second distance from the center of the inner ring 15 to the other ends of the spokes 13 is longer than the radius B of the first inner peripheral surface 124 by a second predetermined distance. As an example, in the inner ring 15 shown in FIG. 8A , a second distance D2 from the center C2 of the inner ring 15 to the other ends E2 of the spokes 13 is set so that it is longer than the radius B of the first inner peripheral surface 124 by the second predetermined distance, as shown in FIG. 8B . Similar to the first predetermined distance, the second predetermined distance can be set appropriately within a range in which the spokes 13 can be fixed to the tread 12, and is, for example, 5 to 10% of the radius B of the first inner peripheral surface 124.

[0058] Next, the inner ring 15 having the plurality of spokes 13 is transported by a transport mechanism 37 shown by dashed lines in Fig. 8A , and the second pins 34 and the third pins 35 are inserted between adjacent spokes 13 (step S12). In the state shown in Fig. 8A , the Z-axis direction is the width direction of the airless tire. As shown in Fig. 8A , the second pins 34 and the third pins 35 are arranged so as to be inserted between adjacent spokes 13. Note that the number of second pins 34 and third pins 35 does not necessarily have to be the same as the number of spokes 13; for example, the second pins 34 and the third pins 35 may be arranged every other second pin 34 and third pin 35 between adjacent spokes 13.

[0059] Next, a third radial force and a fourth radial force opposite to the third force are applied to the multiple spokes 13 so that the second distance D2 shown in FIG. 8A is less than the radius B of the first inner circumferential surface 124 shown in FIG. 8B (step S13). As an example, in the manufacturing apparatus 3, the second moving member 32 is moved radially (in the direction of the arrow shown on the inner circumferential side in FIG. 8A ) toward the outer periphery (the other end E2), and the third force is applied to the spokes 13 via the intermediate ring 14a in contact with the second pin 34. Specifically, the third force is applied to the spokes 13 by applying a fifth radial force to the intermediate ring 14a (first intermediate ring). At the same time, the third moving member 33 is moved radially (in the direction of the arrow shown on the outer periphery in FIG. 8A ) toward the center C2, and the fourth force is applied to the spokes 13 via the intermediate ring 14c in contact with the third pin 35. Specifically, a sixth force in the opposite direction to the fifth force is applied to the intermediate ring 14c (second intermediate ring), which is closer to the other end E2 than the intermediate ring 14a (first intermediate ring), thereby applying a fourth force to the spokes 13. By applying the third and fourth forces to the spokes 13 shown in Figure 8A, the spokes 13 are deformed and their radial length is shortened (their diameter is reduced), and as shown in Figure 8B, the second distance D2 becomes shorter than the radius B of the first inner circumferential surface 124.

[0060] In the example shown in FIG. 8A , the third force is applied to the spokes 13 via the intermediate ring 14a. However, the second pin 34 may be positioned inside the inner ring 15 (so that the second pin 34 faces the third inner circumferential surface) and the third force may be applied to the spokes 13 via the inner ring 15. In the manufacturing apparatus 3 shown in FIG. 7 , pins are used to apply the third and fourth forces. However, the means for applying the forces to the spokes 13 is not limited to pins. For example, the ends of the spokes 13 may be held by clamps or the like, and the clamps holding the ends of the spokes 13 may be moved closer to each other. The radial lengths of the spokes 13 to which the third and fourth forces are applied may vary for each spoke 13. In step S13, the second pin 34 and the third pin 35 may move in opposite directions relative to each other, thereby applying the third and fourth forces to one spoke 13. Alternatively, one of the second pin 34 and the third pin 35 may move radially while the other remains stationary. The direction of the arrow shown on the inner periphery side in FIG. 8A is also referred to as the second direction, and the direction of the arrow shown on the outer periphery side in FIG. 8A is also referred to as the third direction.

[0061] Regarding the spokes 13 and the intermediate ring 14, the spokes 13 may have multiple bent portions between one end and the other end that bend in the direction connecting the one end and the other end. For example, the spokes 13 shown in FIG. 8A have three bent portions that deform in the circumferential direction between one end and the other end, similar to the spokes 13 shown in FIG. 6A. The intermediate ring 14 may also connect the bent portions of the spokes 13. For example, the intermediate ring 14a shown in FIG. 8A connects the bent portions of adjacent spokes 13, similar to the intermediate ring 14a shown in FIG. 6A. As shown in FIG. 8A, by applying a third force and a fourth force to the intermediate ring 14 that connects the bent portions of the spokes 13, the diameter of the spokes 13 can be reduced with a smaller force.

[0062] If the airless tire includes an intermediate ring 14, the circumferential and radial deformations of the spokes 13 are transmitted by the intermediate ring 14 to adjacent spokes 13. Therefore, when the third force and the fourth force are applied to the intermediate ring 14 to make the second distance D2 less than the radius B of the first inner circumferential surface 124, the third force and the fourth force may be applied to only a portion of the intermediate ring 14. For example, the second pins 34 and the third pins 35 shown in FIG. 7 may be thinned out every other one, so that the second pins 34 and the third pins 35 are disposed every other one between adjacent spokes 13. This makes it possible to prevent the diameter of the spokes 13 from being reduced more than necessary.

[0063] If the direction connecting one end of the spoke 13 to the other end E2 forms a minor angle within a predetermined range with the radial direction of the inner circumferential ring 15, the spoke 13 may be provided with a second protrusion and a third protrusion positioned closer to the other end E2 than the second protrusion, and a third force may be applied to the second protrusion and a fourth force may be applied to the third protrusion. Fig. 9B is a front view showing another example of the spoke 13 of an airless tire according to an embodiment of the present invention. The inner circumferential ring 15 shown in Fig. 9B includes multiple spokes 13 and an outer circumferential ring 16, and the tread 12 is joined to the outer circumferential ring 16. The spoke 13 shown in Fig. 9B has a second protrusion P2 and a third protrusion P3, with the second pin 34 contacting the second protrusion P2 and the third pin 35 contacting the third protrusion P3. As shown in Fig. 9B , the radial direction A1 and the direction A2 connecting one end of the spoke 13 to the other end form a minor angle β within a predetermined range. In this case, when the third force and the fourth force are applied to the spokes 13, the third force is applied to the second protrusion P2 and the fourth force is applied to the third protrusion P3. The shapes of the second protrusion P2 and the third protrusion P3 and the predetermined range of the minor angle β can be set as appropriate within a range in which the third force and the fourth force can be appropriately applied to the second protrusion P2 and the third protrusion P3, respectively, and the predetermined range is, for example, 10 to 30 degrees.

[0064] Next, the tread 12 is transported using a transport mechanism 36 shown by dashed lines in Fig. 8B, and the tread 12 and the inner ring 15 with the third and fourth forces applied to the spokes 13 are arranged so that the first inner circumferential surface 124 faces the other end E2 (step S14-1). Furthermore, the wheel 11 is transported using a transport mechanism 37 shown by dashed lines in Fig. 8B, and the wheel 11 and the inner ring 15 with the third and fourth forces applied to the spokes 13 are arranged so that the first outer circumferential surface of the wheel 11 faces the third inner circumferential surface of the inner ring 15 (step S14-2). When the tread 12 and the inner ring 15 are joined using the manufacturing apparatus 3 and the wheel 11 and the inner ring 15 are joined separately, step S14-2 is not performed and the wheel 11 is not arranged. 8B , in the manufacturing apparatus 3, the conveying mechanism 36, with the tread 12 supported on the support portion 36a, moves from above to below the manufacturing apparatus 3 along the Z-axis direction, and positions the tread 12 outside the spokes 13 so that the first inner circumferential surface 124 faces the other end E2. The conveying mechanism 37 also grips the wheel 11, and positions the wheel 11 inside the inner ring 15 so that the first outer circumferential surface faces the third inner circumferential surface. Note that, like the manufacturing apparatus 2, the manufacturing apparatus 3 may have a fixing member for fixing the wheel 11, and the wheel 11 gripped by the conveying mechanism 37 may be fixed to the second pedestal 31 by the fixing member.

[0065] Next, with the wheel 11, tread 12, and inner ring 15 positioned so that the first outer surface faces the third inner surface and the other ends E2 face the first inner surface 124, the third and fourth forces applied to the spokes 13 are removed, and the other ends E2 of the spokes 13 are pressed against the first inner surface 124 to secure them in place, thereby fixing the spokes 13 to the tread 12 (step S15). If the tread 12 and the inner ring 15 are joined using the manufacturing device 3 and the wheel 11 and the inner ring 15 are joined separately, in step S15, with the tread 12 and the inner ring 15 positioned so that the other ends E2 face the first inner surface 124, the third and fourth forces applied to the spokes 13 are removed. 8B , in the manufacturing apparatus 3, the wheel 11, tread 12, and inner ring 15 are arranged so that the first outer peripheral surface and the third inner peripheral surface face each other and the other end E2 faces the first inner peripheral surface 124. Then, the second moving member 32 is moved radially toward the center C2 (in the direction of the arrow shown on the inner peripheral side in FIG. 8B ) to remove the third force from the spokes 13, and the third moving member 33 is moved radially toward the outer peripheral side (the other end E2) (in the direction of the arrow shown on the outer peripheral side in FIG. 8B ) to remove the fourth force from the spokes 13. As shown in FIG. 8C , with the third and fourth forces removed, the second distance D2 is longer than the radius B of the first inner peripheral surface 124, so the other end E2 of the spoke 13 is pressed against the first inner peripheral surface 124 and fixed to the first inner peripheral surface 124. Furthermore, when the other ends E2 of the spokes 13 are pressed against the first inner circumferential surface 124, tensile stress is generated in the tire cords 122a of the tread 12 in the circumferential direction.

[0066] The airless tire manufactured by assembling the wheel 11, tread 12, and inner ring 15 is removed from the manufacturing apparatus 3 using the conveying mechanism 37 (step S16). When only the tread 12 and inner ring 15 are combined, the combined parts are removed from the manufacturing apparatus 3 using the conveying mechanism 36. The removed airless tire is transported to the next step. The conveying mechanism 37 then transports a new inner ring 15 (step S17). Steps S12 to S17 are repeated until the desired number of airless tires have been manufactured. Furthermore, when the wheel 11, tread 12, and inner ring 15 are required, step S11 is executed as needed.

[0067] The inner ring 15 may include, in addition to the plurality of spokes 13, an outer ring 16 having a second outer peripheral surface with a second diameter that is longer than the first diameter of the first inner peripheral surface 124 by a first predetermined length. When the inner ring 15 includes the outer peripheral ring 16, the manufacturing apparatus 3 applies a third force and a fourth force to the plurality of spokes 13 so that the maximum diameter of the second outer peripheral surface is less than the first diameter (step S13a). Next, the tread 12 and the inner ring 15 with the third and fourth forces applied to the plurality of spokes 13 are arranged so that the first inner peripheral surface 124 faces the second outer peripheral surface (step S14-1a), and the wheel 11 and the inner ring 15 with the third and fourth forces applied to the plurality of spokes 13 are arranged so that the first outer peripheral surface faces the third inner peripheral surface (step S14-2a). Then, the third and fourth forces applied to the spokes 13 are removed, and the second outer peripheral surface is pressed against the first inner peripheral surface 124 to bring them into close contact (step S15a). That is, if the inner peripheral ring 15 includes an outer peripheral ring 16, the inner peripheral ring 15 including the spokes 13 and the outer peripheral ring 16 is prepared in step S11, and steps S13 to S15 are replaced with steps S13a to S15a. In step S13a, the diameter of the second outer peripheral surface does not need to be uniformly reduced; it is sufficient that the maximum diameter of the second outer peripheral surface is less than the first diameter. Furthermore, if the tread 12 and the inner peripheral ring 15 are joined using the manufacturing apparatus 3 and the wheel 11 and the inner peripheral ring 15 are joined separately, step S14-2a is not performed, and the wheel 11 is not positioned.

[0068] As an example, in the manufacturing apparatus 3, the conveying mechanism 37 is used to convey the inner ring 15, which includes the spokes 13 and the outer ring 16, and the second pin 34 and the third pin 35 are inserted between adjacent spokes 13. Next, the second moving member 32 is moved in a second direction on the XY plane, and the third moving member 33 is moved in a third direction on the XY plane, so that a fifth force is applied to the intermediate ring 14a in contact with the second pin 34 and a sixth force is applied to the intermediate ring 14c in contact with the third pin 35, so that the maximum value of the diameter of the second outer peripheral surface is less than the first diameter. Next, the conveying mechanism 36, with the tread 12 supported on the support portion 25a, is moved from above to below the manufacturing apparatus 3 along the Z axis direction, and the tread 12 is positioned outside the plurality of spokes 13 to which the third and fourth forces are applied, so that the first inner peripheral surface 124 and the second outer peripheral surface face each other. Next, the wheel 11 is transported using the transport mechanism 37, and the wheel 11 is placed inside the inner ring 15 so that the first outer peripheral surface and the third inner peripheral surface face each other. Then, the second moving member 32 is moved in the third direction on the XY plane, and the third moving member 33 is moved in the second direction on the XY plane, thereby removing the third force and the fourth force from the spokes 13.

[0069] When the contact surface 123 of the tread 12 is worn, the tread 12 of the airless tire is replaced with another tread using the manufacturing device 3. For example, with the conveying mechanism 36 moved downward in the Z-axis direction as shown in FIG. 8B , the wheel 11 of the airless tire is placed at the center of the conveying mechanism 36 by the conveying mechanism 37. Next, while the second moving member 32 is stationary, the third moving member 33 is moved in the third direction so that the second distance D2 is less than the radius B of the first inner circumferential surface 124, thereby applying third and fourth forces to the multiple spokes 13 fixed to the tread 12 and separating the multiple spokes 13 from the tread 12.

[0070] Next, another tread different from the separated tread 12 is placed on the support portion 25a of the conveying mechanism 36, and the conveying mechanisms 36, 37 are moved to position the other tread and the inner ring 15 with the third and fourth forces applied to the multiple spokes 13 so that the second inner circumferential surface faces the other end E2. Then, the third moving member 33 is moved in the second direction to remove the third and fourth forces applied to the multiple spokes 13, thereby fixing the multiple spokes 13 to the other tread. The airless tire with the replaced tread 12 is removed from the manufacturing apparatus 3 by the conveying mechanism 37.

[0071] When the inner ring 15 includes the outer ring 16 and the tread 12 of the airless tire 1 is replaced with another tread using the manufacturing apparatus 2, the inner ring 15 is inserted through the second pin 34 and the third pin 35, and then the second moving member 32 is moved in the second direction to apply a third force to the intermediate ring 14a and the third moving member 33 is moved in the third direction to apply a fourth force to the intermediate ring 14c so that the maximum value of the diameter of the second outer peripheral surface is less than the first diameter, thereby separating the multiple spokes 13 fixed to the tread 12 from the tread 12. Next, a tread different from the separated tread 12 is placed on the support part 36a of the conveying mechanism 36, and the conveying mechanism 36 is moved to position the different tread and the inner ring 15 with the third and fourth forces applied to the multiple spokes 13 so that the second inner and second outer peripheral surfaces face each other. Then, the second moving member 32 is moved in the third direction and the third moving member 33 is moved in the second direction to remove the third and fourth forces applied to the plurality of spokes 13, and fix the second outer peripheral surface to another tread.

[0072] [Embodiment of the Invention] According to this embodiment, a wheel 11 having a first outer circumferential surface and coupled to a vehicle, and a tread 12 having a first inner circumferential surface 124 and contacting a road surface are provided, and the wheel 11 has a plurality of spokes 13 each having one end which is an inner circumferential end and the other end which is an outer circumferential end. The method for manufacturing an airless tire includes applying a first force toward the center in the radial direction to the spokes 13 so that the first distance D1 from the center C1 of the wheel 11 to the other ends E1 of the spokes 13 is longer than the radius B of the first inner circumferential surface 124 by a first predetermined distance, and then arranging the tread 12 and the wheel 11 with the first force applied to the spokes 13 so that the first inner circumferential surface 124 faces the other ends E2 of the spokes 13, and then removing the first force applied to the spokes 13. This makes it possible to manufacture an airless tire that suppresses excessive deformation of the spokes 13.

[0073] In the method for manufacturing an airless tire of this embodiment, the wheel 11 is prepared, which includes the plurality of spokes 13 and an outer ring 16 that connects the other ends E1 and has a second outer peripheral surface with a second diameter that is longer by a predetermined length than the first diameter of the first inner peripheral surface 124. The first force is applied to the plurality of spokes 13 so that the maximum value of the diameter of the second outer peripheral surface is less than the first diameter, and the tread 12 and the wheel 11 with the first force applied to the plurality of spokes 13 are arranged so that the first inner peripheral surface 124 and the second outer peripheral surface face each other. This increases the bonding area with the tread 12, improving the load-bearing capacity of the airless tire.

[0074] In the method for manufacturing an airless tire of this embodiment, the first force is applied to the plurality of spokes 13 fixed to the tread 12 so that the first distance D1 is less than the radius B, thereby separating the plurality of spokes 13 from the tread 12, and another tread different from the tread 12 and the wheel 11 in which the first force is applied to the plurality of spokes 13 are arranged so that the second inner circumferential surface of the another tread faces the other end E1, and the first force applied to the plurality of spokes 13 is removed to fix the plurality of spokes 13 to the another tread. This makes it possible to replace a tread 12 whose contact surface 123 has worn away.

[0075] In the method for manufacturing an airless tire according to this embodiment, the spokes 13 have first protrusions P1, and the direction A1 connecting the one end and the other end E1 of the spokes 13 forms a minor angle within a predetermined range with the radial direction A2, so that when the first force is applied to the spokes 13, the first force is applied to the first protrusions P1. This allows the first force to be applied to the spokes 13 without providing an intermediate ring 14.

[0076] In the method for manufacturing an airless tire of this embodiment, the spokes 13 have a plurality of bent portions between the one end and the other end E1, and the bent portions are bent in a direction connecting the one end and the other end E1, and the airless tire includes an intermediate ring 14 that connects the bent portions of adjacent spokes, and the first force is applied to the spokes 13 by applying the second radial force to the intermediate ring 14. This makes it possible to reduce the first force required to deform the spokes 13.

[0077] The method for manufacturing an airless tire of this embodiment includes a first base 21 whose position is fixed, a fixed member 22 provided on the first base 21 and fixing the wheel 11 to the first base 21, a first movable member 23 attached to the first base 21 so as to be movable in the radial direction relative to the first base 21, a plurality of first pins 24 extending in the width direction of the wheel 11 and fixed to the first movable member 23 along the circumferential direction of the wheel 11, the tread 12, and a device for transporting the tread 12 when positioning the wheel 11 in a state in which the first force is applied to the plurality of spokes 13. Using a manufacturing apparatus 2 including conveying mechanisms 25, 26 for conveying spokes 13, the wheel 11 is fixed to the fixed member 22, the first pin 24 is inserted between adjacent spokes 13, the first moving member 23 is moved in a first direction to apply the first force to the plurality of spokes 13 so that the first distance D1 is less than the radius B, the tread 12 is positioned outside the plurality of spokes 13 to which the first force is applied so that the first inner circumferential surface 124 and the other end E1 face each other, and the first moving member 23 is moved in a direction opposite to the first direction to remove the first force. This makes it possible to manufacture an airless tire that suppresses excessive deformation of the spokes 13.

[0078] According to this embodiment, the tread 12 has a first inner peripheral surface 124 and comes into contact with the road surface, and an inner peripheral ring 15 has a third outer peripheral surface to which one ends of the inner peripheral side of the plurality of spokes 13 are connected, the inner peripheral ring 15 has a plurality of spokes 13 that extend radially from the third outer peripheral surface to which the one ends are connected and are deformable in the radial direction of the inner peripheral ring 15, and a second distance D2 from a center C2 of the inner peripheral ring 15 to another end E2 of the outer peripheral side of the plurality of spokes 13 is a third force in the radial direction and a fourth force in the opposite direction to the third force are applied to the plurality of spokes 13 so that the second distance D2 is longer than the radius B of the surface 124 by a second predetermined distance and the second distance D2 is reduced, the tread 12 and the inner ring 15 with the third and fourth forces applied to the plurality of spokes 13 are arranged so that the other end E2 faces the first inner circumferential surface 124, and the third and fourth forces applied to the plurality of spokes 13 are removed. This makes it possible to manufacture an airless tire that suppresses excessive deformation of the spokes 13.

[0079] In the method for manufacturing an airless tire of this embodiment, the inner ring 15 is prepared, which includes the plurality of spokes 13 and an outer ring 16 that connects the other ends E2 and has a second outer peripheral surface with a second diameter that is longer than the first diameter of the first inner peripheral surface 124 by a predetermined length, and the third force and the fourth force are applied to the plurality of spokes 13 so that the maximum value of the diameter of the second outer peripheral surface is less than the first diameter, and the tread 12 and the inner ring 15 in a state in which the third force and the fourth force are applied to the plurality of spokes 13 are arranged so that the second outer peripheral surface faces the first inner peripheral surface 124. This increases the bonding area with the tread 12, improving the load-bearing capacity of the airless tire.

[0080] In the method for manufacturing an airless tire of this embodiment, the third force and the fourth force are applied to the plurality of spokes 13 fixed to the tread 12 so that the second distance D2 is less than the radius B, thereby separating the plurality of spokes 13 from the tread 12, and another tread different from the tread 12 and the inner ring 15 in a state in which the third force and the fourth force have been applied to the plurality of spokes 13 are arranged so that the second inner circumferential surface of the another tread faces the other end E2, and the third force and the fourth force applied to the plurality of spokes 13 are removed to fix the plurality of spokes 13 to the another tread. This makes it possible to replace a tread 12 whose contact surface 123 has worn away.

[0081] In the method for manufacturing an airless tire of this embodiment, the spokes 13 have second protrusions P2 and third protrusions P3 located closer to the other end E2 than the second protrusions P2, and the direction A2 connecting the one end and the other end E2 of the spokes 13 forms a minor angle within a predetermined range with the radial direction A1, so that the third force is applied to the second protrusions P2 and the fourth force is applied to the third protrusions P3. This makes it possible to apply the first force to the spokes 13 without providing an intermediate ring 14.

[0082] In the method for manufacturing an airless tire of this embodiment, the spokes 13 have a plurality of bent portions between the one end and the other end E2, and the bent portions are bent in a direction connecting the one end and the other end E2, and the airless tire includes a plurality of intermediate rings 14 connecting the bent portions of adjacent spokes 13, and by applying the fifth force in the radial direction to a first intermediate ring and applying a sixth force in the opposite direction to the fifth force to a second intermediate ring that is closer to the other end than the first intermediate ring, the third force and the fourth force are applied to the plurality of spokes 13. This reduces the first force required to deform the spokes 13.

[0083] In the method for manufacturing an airless tire of the present embodiment, a manufacturing apparatus 3 is used that includes: a second base 31 whose position is fixed; a second movable member 32 attached to the second base 31 so as to be movable in the radial direction relative to the second base 31; a third movable member 33 attached to the second base 31 so as to be movable in the radial direction and disposed outside the second movable member 32; a plurality of second pins 34 extending in the width direction of the inner ring 15 and fixed to the second movable member 32 along the circumferential direction of the inner ring 15; a plurality of third pins 35 extending in the width direction of the inner ring 15 and fixed to the third movable member 33 along the circumferential direction; a wheel 11 to be coupled to a vehicle; the tread 12; and conveying mechanisms 36 and 37 that convey the wheel 11 and the tread 12 when arranging the inner ring 15 in a state in which the third force and the fourth force are applied to the plurality of spokes 13. the second pin 34 and the third pin 35 are inserted between the spokes 13, the second moving member 32 is moved in a second direction to apply the third force to the plurality of spokes 13, and the third moving member 33 is moved in a third direction opposite to the second direction to apply the fourth force to the plurality of spokes 13 so that the second distance D2 is less than the radius B, the wheel 11 is positioned inside the inner ring 15 in a state in which the third force and the fourth force are applied to the plurality of spokes 13 so that the first outer surface of the wheel 11 faces the third inner surface of the inner ring 15, and the tread 12 is positioned outside the plurality of spokes 13 in a state in which the third force and the fourth force are applied so that the other end E2 faces the first inner surface 124, and the second moving member 32 is moved in the third direction and the third moving member 33 is moved in the second direction to remove the third force and the fourth force. This makes it possible to manufacture an airless tire that suppresses excessive deformation of the spokes 13.

[0084] In the manufacturing method of an airless tire of this embodiment, the tread 12 has a first elastic portion 121 made of an elastic material, and a first reinforcing layer 122 extending in the width direction of the tread 12 and having higher rigidity than the first elastic portion 121, and the first reinforcing layer 122 is disposed at a position closer to the first inner circumferential surface 124 than a contact surface 123 that comes into contact with the road surface. This makes it possible to further suppress excessive deformation of the spokes 13.

[0085] In the manufacturing method of an airless tire according to this embodiment, the outer ring 16 has a second elastic portion 161 made of an elastic material, and a second reinforcing layer 162 extending in the width direction of the outer ring 16 and having higher rigidity than the second elastic portion 161. This makes it possible to further suppress excessive deformation of the spokes 13.

[0086] Furthermore, according to this embodiment, there is provided an airless tire manufacturing apparatus comprising a plurality of spokes 13 each having one end which is an inner circumferential end and the other end which is an outer circumferential end, extending radially from a first outer circumferential surface of a wheel 11 coupled to a vehicle toward a first inner circumferential surface 124 of a tread 12 that comes into contact with a road surface and being deformable in a radial direction of the wheel 11, with the one ends of the plurality of spokes 13 joined to the first outer circumferential surface, the airless tire manufacturing apparatus comprising: a first base 21 whose position is fixed; a fixing member 22 provided on the first base 21 and fixing the wheel 11 to the first base 21; a first movable member 23 attached to the first base 21 so as to be movable in the radial direction relative to the first base 21; a plurality of first pins 24 extending in the width direction of the wheel 11 and fixed to the first movable member 23 along the circumferential direction of the wheel 11; the tread 12; and a plurality of the spokes 13. and conveying mechanisms (25, 26) for conveying the tread (12) when the wheel (11) is being rotated, the conveying mechanism (25, 26) includes: a conveying mechanism (25, 26) for conveying the tread (12) when the wheel (11) is being rotated; ...

[0087] According to the present embodiment, an airless tire manufacturing device includes an inner circumferential ring 15 connecting one end of a plurality of spokes 13 on the inner circumferential side, and a plurality of spokes 13 extending radially from a third outer circumferential surface of the inner circumferential ring 15 toward a first inner circumferential surface 124 of a tread 12 that comes into contact with a road surface and that are deformable in a radial direction of the inner circumferential ring 15, the device comprising: a second base 31 whose position is fixed; a second movable member 32 attached to the second base 31 so as to be movable in the radial direction; a third moving member 33 disposed outside the second moving member 32; a plurality of second pins 34 extending in the width direction of the inner peripheral ring 15 and fixed to the second moving member 32 along the circumferential direction of the inner peripheral ring 15; a plurality of third pins 35 extending in the width direction and fixed to the third moving member 33 along the circumferential direction of the inner peripheral ring 15; and conveying mechanisms 36, 37 for conveying the tread 12 and the inner peripheral ring 15 when the tread 12 and the inner peripheral ring 15 are arranged, The second pin 34 is inserted between adjacent spokes 13 among the spokes 13, or the second pin 34 is disposed inside the inner circumferential ring 15, and the third pin 35 is inserted between adjacent spokes 13, and the second moving member 32 is moved in a second direction to apply the third radial force to the plurality of spokes 13 so that a second distance D2, which is longer by a second predetermined distance than the radius B of the first inner circumferential surface 124, between the center C2 of the inner circumferential ring 15 to which the one end is joined and the other end, which is the outer circumferential end of the plurality of spokes 13, is reduced. and moving the third moving member 33 in a third direction opposite to the second direction to apply a fourth force to the plurality of spokes 13 in the opposite direction to the third force, disposing the tread 12 and the inner ring 15 in a state in which the third force and the fourth force have been applied to the plurality of spokes 13 so that the other end E2 faces the first inner circumferential surface 124, and moving the second moving member 32 in the third direction and the third moving member 33 in the second direction to remove the third force and the fourth force. This makes it possible to manufacture an airless tire in which excessive deformation of the spokes 13 is suppressed.

[0088] DESCRIPTION OF SYMBOLS 1, 1a... airless tire, 11... wheel, 111... disc, 112... rim, 12... tread, 121... first elastic portion, 122... first reinforcing layer, 122a... tire cord, 123... ground contact surface, 124... first inner circumferential surface, 13... spokes, 131, 132, 133, 134, 135... bending portion, 14, 14a, 14b, 14c... intermediate ring, 15... inner circumferential ring, 16... outer circumferential ring, 161... second elastic portion, 162... second reinforcing layer, 162a... tire cord 2... manufacturing apparatus, 21... first base, 22... fixing member, 23... first moving member, 24... first pin, 25, 26... conveying mechanism, 25a... support portion 3...Manufacturing apparatus, 31...Second base, 32...Second moving member, 33...Third moving member, 34...Second pin, 35...Third pin, 36, 37...Transport mechanism, 36a...Support part A1...Radial direction, A2...Direction connecting one end and the other end, B...Radius of first inner peripheral surface, C1...Center of wheel, C2...Center of inner peripheral ring, D1...First distance, D2...Second distance, E1, E2...Other end, P1...First protrusion, P2...Second protrusion, P3...Third protrusion

Claims

1. A wheel having a first outer circumferential surface and being coupled to a vehicle, and a tread having a first inner circumferential surface and being in contact with the road surface are prepared, the wheel comprising a plurality of spokes having one end which is the inner circumferential end and the other end which is the outer circumferential end, the one end of the plurality of spokes being joined to the first outer circumferential surface, extending radially from the first outer circumferential surface and being deformable in the radial direction of the wheel, and the first distance from the center of the wheel to the other end of the plurality of spokes being longer by a first predetermined distance than the radius of the first inner circumferential surface, A first force directed toward the radial center is applied to a plurality of spokes so that the first distance is reduced. The tread and the wheel in which the first force is applied to the plurality of spokes are arranged such that the first inner surface and the other end face each other. A method for manufacturing an airless tire, comprising removing the first force applied to a plurality of spokes.

2. Prepare a wheel comprising a plurality of spokes and an outer ring connecting the other ends, which has a second outer surface having a second diameter that is longer by a predetermined length than the first diameter of the first inner surface. The first force is applied to a plurality of spokes such that the maximum value of the diameter of the second outer surface is less than the first diameter. A method for manufacturing an airless tire according to claim 1, wherein the tread and the wheel in which the first force is applied to a plurality of spokes are arranged such that the first inner surface and the second outer surface face each other.

3. A first force is applied to a plurality of spokes fixed to the tread so that the first distance is less than the radius, separating the plurality of spokes from the tread. A tread different from the aforementioned tread and the wheel in which the first force is applied to a plurality of spokes are arranged such that the second inner circumferential surface of the other tread and the other end face each other. A method for manufacturing an airless tire according to claim 1, wherein the first force applied to the plurality of spokes is removed and the plurality of spokes are fixed to the other tread.

4. The spoke has a first projection, The direction in which the one end and the other end of the spoke are connected forms a lower angle within a predetermined range from the radial direction. A method for manufacturing an airless tire according to any one of claims 1 to 3, wherein when the first force is applied to the spoke, the first force is applied to the first projection.

5. The spoke has a plurality of bent portions between one end and the other end, The bent portion is bent in the direction connecting the one end and the other end. The airless tire includes an intermediate ring that connects the bent portions of adjacent spokes, A method for manufacturing an airless tire according to any one of claims 1 to 3, wherein the first force is applied to the spoke by applying the second radial force to the intermediate ring.

6. The first base is fixed in position, A fixing member provided on the first base for fixing the wheel to the first base, A first movable member is attached to the first base so as to be movable in the radial direction, A plurality of first pins extending in the width direction of the wheel and fixed to the first moving member along the circumferential direction of the wheel, A manufacturing apparatus is used that includes the tread and a conveying mechanism for conveying the tread when arranging the wheel in a state in which a first force is applied to a plurality of spokes. The wheel is fixed to the fixing member, and the first pin is inserted between adjacent spokes. The first moving member is moved in the first direction so that the first distance is less than the radius, thereby applying the first force to the plurality of spokes. The tread is positioned on the outside of the plurality of spokes in the state in which the first force is applied, such that the first inner surface and the other end face each other. A method for manufacturing an airless tire according to any one of claims 1 to 3, wherein the first moving member is moved in the opposite direction to the first direction to remove the first force.

7. A tread having a first inner surface and contacting the road surface, and an inner ring having a third outer surface to which one end of a plurality of spokes is connected, wherein the inner ring comprises a plurality of spokes extending radially from the third outer surface to which one end is joined, and which are deformable in the radial direction of the inner ring, and the second distance from the center of the inner ring to the other end of the plurality of spokes is longer by a second predetermined distance than the radius of the first inner surface, To reduce the second distance, a third radial force and a fourth force in the opposite direction to the third force are applied to a plurality of spokes. The tread and the inner circumferential ring in which the third force and the fourth force are applied to the plurality of spokes are arranged such that the other end and the first inner circumferential surface face each other. A method for manufacturing an airless tire, comprising removing the third and fourth forces applied to a plurality of spokes.

8. Prepare an inner circumferential ring comprising a plurality of spokes and an outer circumferential ring having a second outer circumferential surface having a second diameter that is longer by a predetermined length than the first diameter of the first inner circumferential surface, and connecting the other ends. The third force and the fourth force are applied to the multiple spokes such that the maximum value of the diameter of the second outer surface is less than the first diameter. A method for manufacturing an airless tire according to claim 7, wherein the tread and the inner circumferential ring in which the third force and the fourth force are applied to a plurality of spokes are arranged such that the second outer circumferential surface and the first inner circumferential surface face each other.

9. The third force and the fourth force are applied to the multiple spokes fixed to the tread so that the second distance is less than the radius, separating the multiple spokes from the tread. A different tread from the aforementioned tread and the inner circumferential ring in which the third force and the fourth force are applied to a plurality of spokes are arranged such that the second inner circumferential surface of the other tread faces the other end. A method for manufacturing an airless tire according to claim 7, wherein the third and fourth forces applied to the plurality of spokes are removed to fix the plurality of spokes to the other tread.

10. The spoke has a second projection and a third projection located closer to the other end than the second projection. The direction in which the one end and the other end of the spoke are connected forms a lower angle within a predetermined range from the radial direction. A method for manufacturing an airless tire according to any one of claims 7 to 9, wherein the third force is applied to the second projection and the fourth force is applied to the third projection.

11. The spoke has a plurality of bent portions between one end and the other end, The bent portion is bent in the direction connecting the one end and the other end. The airless tire comprises a plurality of intermediate rings that connect the bent portions of adjacent spokes, A method for manufacturing an airless tire according to any one of claims 7 to 9, wherein a fifth radial force is applied to a first intermediate ring, and a sixth force in the opposite direction to the fifth force is applied to a second intermediate ring closer to the other end than the first intermediate ring, thereby applying the third force and the fourth force to a plurality of spokes.

12. The second base is fixed in place, A second movable member is attached to the second base so as to be movable in the radial direction, A third movable member is mounted to the second base so as to be movable in the radial direction and is positioned outside the second movable member, A plurality of second pins extending in the width direction of the inner ring and fixed to the second moving member along the circumferential direction of the inner ring, A plurality of third pins extending in the width direction of the inner ring and fixed to the third moving member along the circumferential direction, A manufacturing apparatus is used that includes a wheel to be coupled to a vehicle, the tread, and the inner circumferential ring in a state where the third force and the fourth force are applied to a plurality of spokes, and a conveying mechanism for conveying the wheel and the tread. The second pin and the third pin are inserted between adjacent spokes. The second moving member is moved in the second direction to apply the third force to the multiple spokes so that the second distance is less than the radius, and the third moving member is moved in the third direction opposite to the second direction to apply the fourth force to the multiple spokes. The wheel is positioned inside the inner circumferential ring in a state where the third and fourth forces are applied to the multiple spokes, such that the first outer surface of the wheel and the third inner surface of the inner circumferential ring face each other, and the tread is positioned outside the multiple spokes in a state where the third and fourth forces are applied, such that the other end faces the first inner surface. A method for manufacturing an airless tire according to any one of claims 7 to 9, wherein the second moving member is moved in the third direction and the third moving member is moved in the second direction to remove the third force and the fourth force.

13. The tread comprises a first elastic portion made of an elastic material and a first reinforcing layer extending in the width direction of the tread and having higher rigidity than the first elastic portion. The method for manufacturing an airless tire according to any one of claims 1 to 3 and 7 to 9, wherein the first reinforcing layer is positioned closer to the first inner circumferential surface than the contact surface that contacts the road surface.

14. The method for manufacturing an airless tire according to claim 2 or 8, wherein the outer ring comprises a second elastic portion made of an elastic material and a second reinforcing layer extending in the width direction of the outer ring and having higher rigidity than the second elastic portion.

15. An airless tire manufacturing apparatus comprising a plurality of spokes having one end which is the inner circumference end and the other end which is the outer circumference end, extending radially from the first outer surface of the wheel which is coupled to a vehicle toward the first inner surface of the tread which is in contact with the road surface, and which are deformable in the radial direction of the wheel, wherein one end of the plurality of spokes is joined to the first outer surface, The first base is fixed in position, A fixing member provided on the first base for fixing the wheel to the first base, A first movable member is attached to the first base so as to be movable in the radial direction, A plurality of first pins extending in the width direction of the wheel and fixed to the first moving member along the circumferential direction of the wheel, The system includes the tread and a transport mechanism for transporting the tread when a plurality of spokes are arranged. The wheel is fixed to the fixing member, and the first pin is inserted between adjacent spokes among the plurality of spokes. The first moving member is moved in a first direction to apply a first force toward the radial center to the plurality of spokes, such that the first distance between the center of the wheel to which one end is joined and the other end of the plurality of spokes is reduced by a first predetermined distance longer than the radius of the first inner circumferential surface. The tread and the wheel in which the first force is applied to the plurality of spokes are arranged such that the first inner surface and the other end face each other. An airless tire manufacturing apparatus that removes the first force by moving the first moving member in the opposite direction to the first direction.

16. An airless tire manufacturing apparatus comprising an inner circumferential ring connecting one end of a plurality of spokes, and a plurality of spokes extending radially from a third outer circumferential surface of the inner circumferential ring toward a first inner circumferential surface of the tread that contacts the road surface, and which are deformable in the radial direction of the inner circumferential ring, The second base is fixed in place, A second movable member is attached to the second base so as to be movable in the radial direction, A third movable member is mounted to the second base so as to be movable in the radial direction and is positioned outside the second movable member, A plurality of second pins extending in the width direction of the inner ring and fixed to the second moving member along the circumferential direction of the inner ring, A plurality of third pins extending in the width direction and fixed to the third moving member along the circumferential direction, When the tread and the inner ring are arranged, the system includes a conveying mechanism for conveying the tread and the inner ring, The second pin is inserted between adjacent spokes among the plurality of spokes, one end of which is joined to the third outer surface, or the second pin is placed inside the inner ring, and the third pin is inserted between adjacent spokes. The second moving member is moved in a second direction to apply a third radial force to the multiple spokes, such that the second distance between the center of the inner ring to which one end is joined and the other end which is the outer circumference end of the multiple spokes is reduced by a second predetermined distance longer than the radius of the first inner surface, and the third moving member is moved in a third direction opposite to the second direction to apply a fourth force opposite to the third force to the multiple spokes, The tread and the inner circumferential ring in which the third force and the fourth force are applied to the plurality of spokes are arranged such that the other end and the first inner circumferential surface face each other. An airless tire manufacturing apparatus that moves the second moving member in the third direction and moves the third moving member in the second direction to eliminate the third force and the fourth force.