JP7263939B2 - Airless tire manufacturing method - Google Patents

Description

TECHNICAL FIELD The present invention relates to an heiless tire manufacturing method and an heiless tire.

In recent years, attention has been paid to airless tires, which are tires that do not use air. An airless tire is composed of a wheel fixed to a vehicle, a tread that contacts the ground, and an elastic support that connects the wheel and the tread. In the airless tire, the elastic support portion is elastically deformed, so that the weight of the vehicle can be supported and the impact input from the ground can be absorbed.

In addition, a layered modeling apparatus, a so-called 3D printer, is attracting attention as a means of production. Patent Literature 1 discloses a method of manufacturing a pillar of a vehicle with a 3D printer. This manufacturing method has a step of moving a nozzle for ejecting material in the longitudinal direction of the pillar and a step of moving the nozzle in the width direction of the pillar. By repeating each step, a pillar having resin layers laminated in the width direction of the pillar is manufactured. This manufacturing method makes it possible to obtain a pillar structure with high tensile strength in the longitudinal direction.

JP 2017-149268 A

High strength is required for airless tires. The method disclosed in Patent Document 1 is effective for a rod-shaped member with a clear longitudinal direction, but it is difficult to apply to an airless tire having a structure in which it is difficult to determine the longitudinal direction.

The present invention has been made in view of such problems, and an object thereof is to provide an heiless tire manufacturing method capable of manufacturing an heiless tire having high strength, and an heiless tire having high strength. .

A method for manufacturing an heiress tire according to one aspect of the present invention repeats a layer forming step of forming layers by moving a nozzle for discharging a material, and laminating a plurality of layers in the rotation axis direction of the heiress tire. Form. In the layer forming step, in the peripheral region located around the space, the first step is to move the nozzle so as to surround the space with a closed curve and form a layer with a continuous material continuously discharged from the nozzle. and, in the first outer ring region, a second step of moving the nozzles along the circumferential direction of the outer ring to form a layer with a continuous material continuously discharged from the nozzles; and a third step of moving the nozzle along the circumferential direction of the inner ring to form a layer with a continuous material continuously ejected from the nozzle in the region.

ADVANTAGE OF THE INVENTION According to this invention, the heiress tire provided with high intensity|strength can be provided.

FIG. 1 is a perspective view showing an heiress tire according to this embodiment. FIG. 2 is a plan view showing the heiress tire according to this embodiment. FIG. 3 is a configuration diagram showing a layered manufacturing apparatus for manufacturing an elastic support. FIG. 4A is an explanatory diagram showing the steps of manufacturing the elastic support portion. FIG. 4B is an explanatory diagram showing the steps of manufacturing the elastic support portion. FIG. 5A is an explanatory diagram showing an overview of the layer forming process. FIG. 5B is an explanatory diagram showing an enlarged area A shown in FIG. 5A. FIG. 6 is an explanatory diagram schematically showing the layers formed by the layer forming process. FIG. 7A is an explanatory diagram showing an example of a circular orbit surrounding a space. FIG. 7B is an explanatory diagram showing an example of a circular orbit surrounding a space. FIG. 8 is an explanatory diagram schematically showing the layers formed by the layer forming process. FIG. 9 is an explanatory diagram showing an example of the elastic support portion. FIG. 10 is an explanatory diagram showing an example of the elastic support portion.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description of the drawings, the same parts are denoted by the same reference numerals, and the description thereof is omitted.

The configuration of an heiress tire 1 according to the present embodiment will be described with reference to FIGS. 1 and 2. FIG. The heiress tire 1 is composed of a wheel 2 , an elastic support portion 3 and a tread 4 . Note that the illustration of the wheel 2 is omitted in FIG.

The wheel 2 is fixed to a hub provided on the vehicle. The wheel 2 has a disc portion 2a and a rim portion 2b. The disk portion 2a has a disk shape and is fixed to the hub by fastening means such as bolts. The rim portion 2b has a cylindrical shape and is provided radially outside the disk portion 2a. The disk portion 2a and the rim portion 2b are integrally formed.

The elastic support portion 3 is arranged radially outward of the wheel 2 . The elastic support portion 3 connects the wheel 2 and the tread 4 . The elastic support portion 3 is made of an elastic material such as thermoplastic resin or thermosetting resin. By elastically deforming the elastic support portion 3, the heiress tire 1 can support the weight of the vehicle and absorb the impact input from the ground. A detailed structure of the elastic support portion 3 will be described later.

The tread 4 is arranged radially outside the elastic support portion 3 . The tread 4 has a cylindrical shape and is made of a resin material such as rubber. The outer peripheral surface of the tread 4 serves as a contact surface with the ground. A force (driving force or braking force) generated on the vehicle side is transmitted to the ground via the wheels 2 , the elastic support portions 3 and the tread 4 .

The elastic support portion 3 has an inner peripheral ring 30 , an outer peripheral ring 31 and a plurality of spokes 32 . The inner peripheral ring 30, the outer peripheral ring 31, and the plurality of spokes 32 are integrally formed.

The inner peripheral ring 30 is arranged radially outside the wheel 2 . The inner peripheral ring 30 has a cylindrical shape and circumscribes the outer peripheral surface of the rim portion 2b.

The outer ring 31 is arranged radially inside the tread 4 . The outer ring 31 has a cylindrical shape and inscribes the inner peripheral surface of the tread 4 .

The plurality of spokes 32 radially extend along the radial direction of the heiress tire 1 and connect the inner peripheral ring 30 and the outer peripheral ring 31 . The radially outer ends of the spokes 32 are connected to the outer ring 31 , and the radially inner ends of the spokes 32 are connected to the inner ring 30 .

In this embodiment, the plurality of spokes 32 are arranged adjacent to each other while being spaced apart in the circumferential direction of the heiress tire 1 . The elastic support portion 3 is formed with a space portion 33 surrounded by a pair of spokes 32 adjacent to each other in the circumferential direction of the heiress tire 1 , an inner peripheral ring 30 and an outer peripheral ring 31 . In the present embodiment, the space 33 is a space that communicates with the heiress tire 1 in the rotation axis direction. However, the space portion 33 may be a space filled with a material different from the material forming the elastic support portion 3 .

Next, a method for manufacturing the heiress tire 1 will be described. Prior to the description of the manufacturing method of the heiress tire 1, the layered manufacturing apparatus will be described.

In FIG. 3 , the layered manufacturing apparatus 100 is composed of a nozzle 110 and a stage 120 . The nozzle 110 is heated by a heat source (not shown). The material Ma supplied to the nozzle 110 is melted by heat, and the melted material Ma is discharged from the nozzle 110 . The nozzle 110 can two-dimensionally move on the XY plane (horizontal plane) defined by the orthogonal X-axis and Y-axis by power transmission from a drive mechanism (not shown). A layer L1 having a predetermined shape can be formed on the stage 120 by moving the nozzle 110 two-dimensionally while ejecting the material Ma from the nozzle 110 .

Further, the nozzle 110 can move in the Z-axis direction (vertical direction) by power transmission from a drive mechanism (not shown). New layers L2 and L3 can be formed on previously formed layers L1 and L2 by moving the nozzle 110 in the Z-axis direction. By laminating a plurality of layers L1, L2, and L3 each formed in a desired shape, a three-dimensional structure can be manufactured.

In addition, in the layered manufacturing apparatus 100, the layers L1 to L3 may be formed by moving the stage 120 along the XY plane. Similarly, both the nozzle 110 and the stage 120 may be moved along the XY plane to form each layer L1-L3. Similarly, when stacking the layers L1 to L3 in the Z-axis direction, the stage 120 may be moved, or both the nozzle 110 and the stage 120 may be moved.

In manufacturing the heiress tire 1 , the elastic support portion 3 is formed using the laminate molding apparatus 100 . First, as shown in FIG. 4A, the layer L1 is formed by moving the nozzle 110 that discharges the material Ma on the XY plane (layer forming step). This layer forming process is repeated, and the elastic support portion 3 is formed by laminating a plurality of layers L1 to Ln (n: natural number) in the rotation axis direction of the heiless tire 1 .

In the elastic support portion 3 (hereless tire 1) thus formed, the lamination direction of the layers L1 to Ln, that is, the Z-axis direction, coincides with the rotation axis. Layers L1 to Ln formed in individual layer forming steps constitute a cross section of the elastic support portion 3 when viewed from a plane perpendicular to the rotation axis of the heiress tire 1. As shown in FIG.

Next, with reference to FIGS. 5A, 5B and 6, a layer forming process for forming a single layer (eg layer Ln) will be described. In FIG. 6 , D1 indicates the radially inner side of the heiress tire 1 and D2 indicates the radially outer side of the heiless tire 1 . For convenience of explanation, FIG. 6 shows the rim portion 2b and the tread 4 of the wheel 2 together with the elastic support portion 3. As shown in FIG.

In the layer forming step, the outer ring 31 is divided into a first outer ring region 31a and a second outer ring region 31b (not shown in FIGS. 5A and 5B). The first outer ring region 31 a is a region of the outer ring 31 that is adjacent to the radially inner side of the tread 4 . On the other hand, the second outer ring region 31b is a region of the outer ring 31 that is adjacent to the first outer ring region 31a in the radial direction. That is, the first outer ring region 31 a forms a radially outer region of the outer ring 31 , and the second outer ring region 31 b forms a radially inner region of the outer ring 31 .

Similarly, in the layer forming step, the inner ring 30 is formed by dividing it into a first inner ring region 30a and a second inner ring region 30b (not shown in FIGS. 5A and 5B). The first inner peripheral ring region 30 a is a region of the inner peripheral ring 30 adjacent to the radially outer side of the wheel 2 . On the other hand, the second inner ring region 30b is a region of the inner ring 30 adjacent to the first inner ring region 30a in the radial direction outside. That is, the first inner ring region 30a forms a radially inner region of the inner ring 30, and the second inner ring region 30b forms a radially outer region of the inner ring 30. there is

The layer forming process has a first process, a second process and a third process described below. A two-dimensional layer Ln is formed by three steps.

In the first step, as shown in FIG. 5B , a peripheral region located around the space 33 is formed by moving the nozzle 110 so as to surround the space 33 with a closed curve. An arrow C3 shown in FIG. 5B conceptually indicates the trajectory of the nozzle 110 around the space 33. As shown in FIG.

Specifically, as shown in FIG. 6, the nozzle 110 is continuously moved starting from the point P31a, going around the space 33, and returning to the point P31a. Thereby, an annular structural portion C31a surrounding the space portion 33 is formed. Similarly, as shown in FIG. 6, the nozzle 110 is continuously moved starting from the point P31b, going around the space 33, and returning to the point P31b. Thereby, an annular structural portion C31b surrounding the space portion 33 is formed. The annular structural portion C31b is formed by a circular track that is one size larger than the annular structural portion C31a, and is adjacent to the radially outer side of the annular structural portion C31a.

An annular structure surrounding the space 33 is formed for each space 33 . As shown in FIG. 6, the nozzle 110 is continuously moved starting from the point P32a, going around the space 33, and returning to the point P32a. Thereby, an annular structural portion C32a surrounding the space portion 33 is formed. Similarly, as shown in FIG. 6, the nozzle 110 is continuously moved starting from the point P32b, going around the space 33, and returning to the point P32b. Thereby, an annular structural portion C32b surrounding the space portion 33 is formed. The annular structural portion C32b is formed by a circular orbit that is one size larger than the annular structural portion C32a, and is adjacent to the radially outer side of the annular structural portion C32a.

A peripheral region positioned around the space 33 is continuously formed by the orbit of the nozzles 110 corresponding to the space 33 . Here, the surrounding region consists of a pair of adjacent spokes 32, a second outer ring region 31b positioned between the pair of spokes 32, and a second inner ring region 30b positioned between the pair of spokes 32. Equivalent to. That is, the pair of spokes 32, the second outer ring region 31b, and the second inner ring region 30b are formed by annular structural portions C31a and C31b surrounding the space 33. As shown in FIG.

In the orbit of the nozzle 110 corresponding to one space 33, only one half (width t5) of the spoke 32 is formed with the center line extending in the radial direction as a boundary. Therefore, the spokes 32 as a whole are formed by respectively drawing circular orbits with respect to two adjacent space portions 33 .

In the first step, the spokes 32 can be formed continuously along their longitudinal direction, so that the strength of the spokes 32 can be increased. In addition, a radially inner region of the outer ring 31 can be formed continuously with the pair of spokes 32 . Thereby, the strength of the pair of spokes 32 and the outer peripheral ring 31 can be increased. Similarly, a radially outer region of the inner ring 30 can be formed continuously with the pair of spokes 32 . Thereby, the strength of the pair of spokes 32 and the inner ring 30 can be increased.

In the example shown in FIG. 6, the surrounding area of the space portion 33 is formed by two rounds of annular structural portions C31a and C31b. However, the number of annular structural portions can be arbitrarily set according to the strength required of the inner peripheral ring 30 , the outer peripheral ring 31 and the spokes 32 and the line width of the material Ma ejected from the nozzle 110 .

Moreover, in FIG. 5B, the arrow C3 is drawn in the counterclockwise direction. However, the nozzle 110 may be moved along the circumference of the space 33, and may be moved clockwise.

In the second step, as shown in FIG. 5A, the nozzles 110 are moved along the circumferential direction of the outer ring 31 to form the first outer ring region 31a. An arrow C1 shown in FIG. 5A conceptually indicates the trajectory of the nozzle 110 in the first outer peripheral ring region 31a.

Specifically, the nozzle 110 is continuously moved so as to draw a circle (an example of a closed curve). The orbit of the nozzle 110 in the first outer ring region 31a forms an annular structure C11 that makes one turn along the circumferential direction of the outer ring 31 (see FIG. 6). That is, the first outer ring region 31a is formed by an annular structure portion C11 along the circumferential direction of the outer ring 31. As shown in FIG.

In the second step, the surrounding area formed for each space 33 can be surrounded by a circular orbit that makes one turn along the circumferential direction of the outer ring 31 . Thereby, the strength of the outer peripheral ring 31 can be increased.

Here, the boundary between the first outer ring region 31a and the second outer ring region 31b is set radially outward from the radial center portion of the outer ring 31 (the position where the thickness is t2). In addition, the boundary between the first outer ring region 31a and the second outer ring region 31b is set substantially at the center of the structure (thickness t3 in the radial direction) in which the outer ring 31 and the tread 4 are combined.

As a result, the boundary between the first outer ring region 31a and the second outer ring region 31b, in which the nozzles 110 have different orbits, can be set at the central position (neutral axis) with the tread 4 also taken into account. As a result, the strength of the outer ring 31 can be increased.

In the third step, as shown in FIG. 5A, the nozzle 110 is moved along the circumferential direction of the inner ring 30 to form the first inner ring region 30a. An arrow C2 shown in FIG. 5A conceptually indicates the trajectory of the nozzle 110 in the first inner peripheral ring region 30a.

Specifically, the nozzle 110 is continuously moved so as to draw a circle (an example of a closed curve). The circular orbit of the nozzles 110 in the first inner ring region 30a forms an annular structure C21 that makes one turn along the circumferential direction of the inner ring 30 (see FIG. 6). That is, the first inner peripheral ring region 30a is formed by an annular structure portion C21 along the circumferential direction of the inner peripheral ring 30. As shown in FIG.

In the second step, the surrounding area formed for each space 33 can be surrounded by a circular orbit that makes one turn along the circumferential direction of the inner ring 30 . Thereby, the strength of the inner peripheral ring 30 can be increased.

Here, the boundary between the first inner peripheral ring region 30a and the second inner peripheral ring region 30b is set radially inward from the radial center portion (the position where the thickness is t1) of the outer peripheral ring 31. . In addition, the boundary between the first outer ring region 31a and the second outer ring region 31b is set approximately at the center of the structure (thickness t4 in the radial direction) that combines the inner ring 30 and the rim portion 2b. there is

As a result, the boundary between the first inner ring region 30a and the second inner ring region 30b, in which the orbits of the nozzles 110 are different, can be set at the central position (neutral axis) with the rim portion 2b also taken into account. As a result, the strength of the inner peripheral ring 30 can be increased.

Note that the arrows C1 and C2 are drawn in the counterclockwise direction in FIG. 5A. However, the nozzles 110 may be moved along the circumferential directions of the outer ring 31 and the inner ring 30, or may be moved clockwise.

In addition, in the second step, the first outer peripheral ring region 31a is formed as an annular structure portion C11 that is continuous over one round. However, the first outer ring region 31a may have discontinuities in the circumferential direction of the outer ring 31 as long as the strength of the elastic support portion 3 can be ensured. Such a technique is also applied to the formation of the first inner peripheral ring region 30a.

Further, the example shown in FIG. 6 shows a state in which the first outer peripheral ring region 31a is formed by one round of the annular structure portion C11. However, the number of annular structural portions can be arbitrarily set according to the strength required for the outer peripheral ring 31 and the line width of the material Ma discharged from the nozzle 110 . Such a technique is also applied to the formation of the first inner peripheral ring region 30a.

The main flow of the layer forming process is the same as the above-described first to third processes, but other details regarding the layer forming process will be supplemented below. In each of the steps described above, the start position at which the ejection of the material Ma from the nozzle 110 is started is defined within the plane forming the layer Ln. In the example shown in FIG. 6, points P31b, P31b, P32a, and P32b correspond to the starting positions. Also, although not shown in FIG. 6, a starting position is also defined in the first outer ring region 31a and the first inner ring region 30a.

As the nozzle 110 passes through the circular orbit, the material Ma becomes discontinuous at the start position where the discharge of the material Ma is started. Therefore, in this embodiment, the start positions are set to be different between adjacent layers. As a result, it is possible to suppress the alignment of the discontinuous portions of the material Ma in the vertical direction. As a result, the strength of the entire elastic support portion 3 can be increased. However, it is preferable that the starting positions are different not only in adjacent layers but also in all layers L1 to Ln.

Moreover, when moving the nozzle 110 to form the layer Ln, the orbit of the nozzle 110 is different in each step. Therefore, gaps 34 are generated even in areas that should be filled with the material Ma. Therefore, the layer forming process according to the present embodiment further includes a fourth process of filling the gap 34 with the material Ma, in addition to the three processes described above. Through this fourth step, the gaps 34 generated in the structure can be filled with the material Ma.

When forming the peripheral region of the space 33 in the first step, the orbit of the nozzle 110 depends on the structure of the peripheral region surrounding the space 33 . For example, as shown in FIG. 7A, when the space 33 is surrounded by an arbitrary curve, the nozzle 110 is moved to draw a closed curve along the shape of the periphery of the space 33 . Moreover, as shown in FIG. 7B , when the space 33 is surrounded by straight lines other than the four, the nozzle 110 is moved so as to draw a closed curve along the shape of the periphery of the space 33 .

Also, in the description of the first step, a configuration in which one space portion 33 is provided between a pair of adjacent spokes 32 has been described. However, a configuration in which a plurality of spaces 33 are arranged radially between a pair of adjacent spokes 32 may be employed. FIG. 8 shows, as an example of the spokes 32, a grid-like spoke in which adjacent spokes 32 are connected in a central region 32b. In the lattice-shaped spokes 32 , space portions 33 a exist in radial inner regions 32 a of the spokes 32 , and space portions 33 b exist in radial outer regions 32 c of the spokes 32 .

In this case, annular structure portions C31a and C31b (C32a and C32b) surrounding the space portion 33 are formed in the region surrounding the space portion 33a. Similarly, annular structures C33a and C33b (C34a and C34b) surrounding the space 33 are formed in the region surrounding the space 33b. A pair of adjacent spokes 32 and a second outer ring region 31b and a second inner ring region 30b positioned between the spokes 32 are formed by the orbit of the nozzle 110 in each surrounding region of the spaces 33a and 33b. Formed continuously.

As described above, the method for manufacturing the heiress tire 1 according to the present embodiment repeats the layer forming step of forming layers by moving the nozzle 110 that discharges the material Ma, and laminates a plurality of layers in the rotation axis direction of the heiress tire 1. Thus, the heiress tire 1 is formed. In this case, the layer forming process includes a first step of forming a layer by moving the nozzle 110 so as to surround the space 33 with a closed curve, and a first outer peripheral ring region 31a. Then, in the second step of forming a layer by moving the nozzles 110 along the circumferential direction of the outer ring 31, and in the first inner ring region 30a, the nozzles 110 are moved along the circumferential direction of the inner ring 30. and a third step of forming a layer.

According to this manufacturing method, since the movement direction of the nozzle 110 is switched according to the structure of the heiress tire 1 when forming the layer, strength characteristics can be imparted in consideration of the structure of the heiress tire 1 . Thereby, the heiress tire 1 having high strength can be manufactured.

In addition, in the present embodiment, the surrounding area of the space portion 33 includes the second outer ring area 31b of the outer ring 31 that is adjacent to the radially inner side of the first outer ring area 31a. A boundary between the first outer ring region 31 a and the second outer ring region 31 b is positioned radially outward of the radial center portion of the outer ring 31 .

According to this method, the boundary of the region can be brought closer to the radial center position of the structure in which the tread 4 is added to the outer ring 31 . As a result, the boundary of the region can be set at a position where the generated bending stress is small, so the strength of the heiress tire 1 can be increased.

Further, in the present embodiment, the surrounding area of the space portion 33 includes the second inner ring area 30b of the inner ring 30, which is adjacent to the first inner ring area 30a in the radial direction. The boundary between the first inner ring region 30 a and the second inner ring region 30 b is located radially inward of the radial center portion of the inner ring 30 .

According to this method, the boundaries of the regions can be brought closer to the center position in the radial direction of the structure in which the rim portion 2b is added to the inner peripheral ring 30 . As a result, the boundary of the region can be set at a position where the generated bending stress is small, so the strength of the heiress tire 1 can be increased.

In addition, in the present embodiment, the starting positions at which the ejection of the material Ma from the nozzles 110 is started, which are defined in the planes forming the layers, are different between the adjacent layers.

Since the starting positions are different between the adjacent layers, it is possible to suppress the locations where the stress is concentrated from continuing in the vertical direction. As a result, it is possible to suppress the concentration of stress and the occurrence of cracks at specific locations. As a result, the strength of the heiress tire 1 can be increased.

Further, in the present embodiment, the layer forming step has a fourth step of filling the gap 34 generated when forming the layer with the material Ma.

It is possible to fill the gap 34 generated in a different process. Thereby, the materials Ma formed in different steps can be further connected. As a result, the strength of the heiress tire 1 can be increased.

Further, in the present embodiment, the layer forming process is performed using the layered manufacturing apparatus 100 that melts the material Ma with heat and discharges it from the nozzle 110 .

The heiress tire 1 can be manufactured using a laminate molding apparatus (3D printer).

In addition, when the heiress tire 1 according to the present embodiment is viewed in a cross section perpendicular to the rotation axis of the heiress tire 1, in the surrounding area located around the space 33, along a closed curve surrounding the space 33 , and annular structures C31a and C31b. Since the annular structural portions C31a and C31b are formed of a continuous material Ma continuously discharged from the nozzle 110, they have a structure with uniform mechanical properties (first structural portion). Here, mechanical properties refer to properties selected from bending stiffness, tensile strength, specific burst strength, elongation, brittleness, and combinations thereof. In addition, the phrase "the mechanical properties are uniform" includes not only the state in which the mechanical properties match, but also the state in which the mechanical properties vary within the allowable range.

According to this configuration, the spokes 32 can be formed continuously along the longitudinal direction, so that the strength of the spokes 32 can be increased. Thereby, the heiress tire 1 having high strength can be provided.

Further, in the present embodiment, when the heiress tire 1 is viewed in a cross section perpendicular to the rotation axis of the heiress tire 1, the first outer ring region 31a has an annular shape along the circumferential direction of the outer ring 31. It has a structure C11. Since the annular structural portion C11 is formed of a continuous material Ma continuously discharged from the nozzle 110, the structure has uniform mechanical properties (second structural portion).

According to this configuration, in the first outer ring region 31a, the mechanical properties are uniform along the circumferential direction, and the strength of the outer ring 31 can be increased. Thereby, the strength of the heiress tire 1 can be increased.

Further, in the present embodiment, when viewed in a cross section perpendicular to the rotation axis of the heiress tire 1, the first inner ring region 30a has a circular shape along the circumferential direction of the inner ring 30. It has an annular structural portion C21. Since the annular structural portion C21 is formed of a continuous material Ma continuously discharged from the nozzle 110, it has a structure with uniform mechanical properties ( third structural portion).

In the first inner peripheral ring region, the mechanical properties are the same along the circumferential direction, so the strength of the mounting surface of the wheel can be increased. Thereby, the strength of the heiress tire can be increased.

Further, in the present embodiment, the space portion 33 is a space that communicates with the heiress tire 1 in the rotation axis direction. Further, the space portion 33 may be a space filled with a material different from the material Ma forming the heiress tire 1 (elastic support portion 3).

According to this configuration, it is possible to provide the heiress tire 1 having various elastic properties.

In addition, in this embodiment, the plurality of spokes 32 are configured to radially extend along the radial direction. However, as shown in FIGS. 9 and 10, the heiress tire 1 according to this embodiment can be applied to structures having spokes 32 of various forms.

While embodiments of the present invention have been described above, the discussion and drawings forming part of this disclosure should not be construed as limiting the invention. Various alternative embodiments, implementations and operational techniques will become apparent to those skilled in the art from this disclosure.

1 Airless Tire 2 Wheel 3 Elastic Support Portion 30 Inner Ring 30a First Inner Ring Region 30b Second Inner Ring Region 31 Outer Ring 31a First Outer Ring Region 31b Second Outer Ring Region 32 Spoke 33 Space 34 Gap 4 tread

Claims (6)

An inner peripheral ring arranged radially outward of the wheel, an outer peripheral ring arranged radially inward of the tread positioned radially outward of the wheel, and a plurality of couplings connecting the inner peripheral ring and the outer peripheral ring. In a method for manufacturing an airless tire having spokes of
Repeating the layer forming step of forming layers by moving the nozzle that discharges the material, forming the heiress tire by laminating a plurality of the layers in the rotation axis direction of the heiress tire,
The layer forming step includes
In a peripheral region positioned around a space defined by a pair of spokes adjacent to each other in the circumferential direction of the inner ring, the outer ring, and the inner ring, the space is surrounded by a closed curve. a first step of moving a nozzle to form the layer with a series of materials continuously expelled from the nozzle ;
In the first outer ring region adjacent to the inner side of the tread in the radial direction of the outer ring, the nozzles are moved along the circumferential direction of the outer ring to continuously discharge a continuous material from the nozzles. a second step of forming the layer with
In the first inner peripheral ring region adjacent to the radially outer side of the wheel in the inner peripheral ring, the nozzles are moved along the circumferential direction of the inner peripheral ring to continuously discharge one liquid from the nozzles. a third step of forming said layer of subsequent material ;
A method for manufacturing an airless tire having The peripheral region includes a second peripheral ring region adjacent to the radially inner side of the first peripheral ring region in the peripheral ring,
The manufacturing method of the heiress tire according to claim 1, wherein a boundary between the first outer ring region and the second outer ring region is positioned radially outward of a radial center portion of the outer ring. The peripheral region includes a second inner peripheral ring region adjacent to the radially outer side of the first inner peripheral ring region among the inner peripheral rings,
The manufacturing method of the heiress tire according to claim 1 or 2, wherein a boundary between the first inner ring region and the second inner ring region is positioned radially inward of a radial center portion of the inner ring. . 4. A starting position for starting ejection of the material from the nozzle, wherein the starting position defined in a plane constituting the layer is different between the adjacent layers. A method for manufacturing the described airless tire. The layer forming step includes
The manufacturing method of the heiress tire according to any one of claims 1 to 4, further comprising a fourth step of filling a gap generated when forming the layer with the material. The manufacturing method of the heiress tire according to any one of claims 1 to 5, wherein the layer forming step is performed using a laminate molding apparatus that melts the material with heat and discharges the material from the nozzle.

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