JP6630114B2 - Non-pneumatic tire, mold and method of manufacturing non-pneumatic tire - Google Patents

Description

  The present invention relates to a non-pneumatic tire that does not require filling with pressurized air when used.

In a conventional pneumatic tire that is used by being filled with pressurized air, puncture is a structurally inevitable problem.
In order to solve such a problem, in recent years, for example, as shown in Patent Literature 1 below, a mounting body attached to an axle, an inner cylindrical body exteriorly mounted on the mounting body, and an inner cylindrical body in a tire radial direction are mounted. A ring member including an outer cylinder that surrounds from the outside, and a plurality of connection members that are arranged along the tire circumferential direction between the inner cylinder and the outer cylinder, and that couple these two cylinders, Non-pneumatic tires have been proposed.

JP 2013-86712 A

  However, in the conventional non-pneumatic tire, there is room for improvement in improving the productivity of the intermediate molded body when molding the intermediate molded body in which the ring member and the connecting member are integrally formed. .

  The present invention has been made in view of the circumstances described above, and has as its object to improve productivity.

In order to solve the above problems, the present invention proposes the following means.
A non-pneumatic tire according to the present invention is a ring member including a mounting body attached to an axle, an inner cylinder body exteriorly mounted on the mounting body, and an outer cylinder body surrounding the inner cylinder body from outside in a tire radial direction. And a connecting member that is provided between the inner cylinder and the outer cylinder along the circumferential direction of the tire, and that connects the two cylinders to each other. The size of the inner cylinder in the tire width direction is smaller than the size of the outer cylinder in the tire width direction. An inner linear portion is disposed at a position equivalent to a side edge in the tire width direction of the inner cylindrical body in the tire width direction, and is provided on an orthogonal plane orthogonal to a tire axis, and is provided in the tire width direction of the connecting member. Tire diameter at both side edges of the tire The outer end portion is disposed in an equivalent position in the side edge and the tire width direction of the tire width direction of the outer cylindrical body, the outer straight portion is provided which is located on the orthogonal plane which is orthogonal to the tire axis, In the cross section of the ring member along the tire radial direction and the tire width direction through the inner end of the connecting member in the tire radial direction, the outer peripheral surface of the inner cylindrical body and the inner peripheral surface of the outer cylindrical body, respectively. A distance H0 along the tire radial direction between the connecting portions with the connecting member, and a distance H1 from the connecting portion on the outer peripheral surface of the inner cylindrical body to an outer edge of the inner straight portion in the tire radial direction. , And the distance H2 from the connection portion on the inner peripheral surface of the outer cylinder to the inner edge of the outer straight portion in the tire radial direction is expressed by the following equations (1) and (2). that it meets And butterflies.
0.1 <(H1 / H0) <0.35 (1)
0.1 <(H2 / H0) <0.35 (2)

The mold according to the present invention is a mold that forms the non-pneumatic tire, and includes a pair of mold members that are assembled so as to be separable in a tire width direction, and the ring is provided between the pair of mold members. A cavity for molding an intermediate molded body in which a member and the connection member are integrally formed is defined, and at least one of the pair of mold members is molded in the cavity to form the mold. A pressing member for pressing the intermediate molded body in close contact with the member in the tire width direction and releasing the mold member from the mold member is provided, and the pressing member includes a side edge of the inner cylindrical body and the inner straight portion, It is characterized in that the side edge of the outer cylinder and the outer straight portion are pressed integrally.
In addition, the mold according to the present invention includes a mounting member attached to an axle, an inner cylinder externally mounted on the attachment, and a ring member including an outer cylinder surrounding the inner cylinder from the outside in the tire radial direction. A plurality of connecting members arranged between the inner cylinder and the outer cylinder along the circumferential direction of the tire, and connecting these two cylinders to each other, the tire width of the inner cylinder being The size in the direction is smaller than the size of the outer cylinder in the tire width direction, and the inner side in the tire radial direction at both side edges in the tire width direction of the connecting member has a tire width in the inner cylinder. An inner straight portion located on an orthogonal plane perpendicular to the tire axis is provided at a position equivalent to the side edge of the tire width direction and a tire radial direction at both side edges of the connection member in the tire width direction. The outer end of the A mold for forming a non-pneumatic tire provided with an outer linear portion located on an orthogonal plane perpendicular to the tire axis, disposed at a position equivalent to a side edge in the tire width direction and a tire width direction. A pair of mold members that are separably assembled in the tire width direction, and a cavity that forms an intermediate molded body in which the ring member and the connection member are integrally formed between the pair of mold members. At least one mold member of the pair of mold members is pressed in the tire width direction with the intermediate molded body molded in the cavity and in close contact with the mold member to separate from the mold member. A pressing member to be molded is provided, and the pressing member integrally presses the side edge and the inner straight portion of the inner cylinder and the side edge and the outer straight portion of the outer cylinder, respectively. It is characterized by.

  The method of manufacturing a non-pneumatic tire according to the present invention is a method of manufacturing a non-pneumatic tire that forms a non-pneumatic tire using the mold, and a step of forming the intermediate molded body in the cavity. Releasing the pair of mold members from the intermediate molded body, wherein the step of releasing includes releasing the intermediate member to one of the pair of mold members provided with the pressing member. A step of releasing the other mold member from the intermediate molded body in a state in which the molded body is in close contact with the intermediate molded body; and, in the intermediate molded body in close contact with the one mold member, a side edge of the inner cylindrical body and the inner side. The straight portion, the side edge of the outer cylinder and the outer straight portion are respectively pressed integrally in the tire width direction by the pressing member, and the intermediate molded body is protruded from the one mold member to be released. And having And butterflies.

According to these inventions, in the intermediate molded body in close contact with one of the mold members, the side edge and the inner straight portion of the inner cylinder, and the side edge and the outer straight portion of the outer cylinder are each pressed by the pressing member. The molded body is pressed integrally in the tire width direction, and the intermediate molded body is protruded from one of the mold members to be released. Here, the inner linear portion is disposed at a position equivalent to the side edge of the inner cylindrical body in the tire width direction, located on an orthogonal plane orthogonal to the tire axis, and the outer linear portion is formed of the outer cylindrical body. Since the side edge is arranged at a position equivalent to the tire width direction and is located on an orthogonal plane orthogonal to the tire axis, when the pressing member presses the intermediate molded body as described above, the pressing member and the intermediate A contact area with the molded body can be secured. Thereby, when the pressing member presses the intermediate molded body, time has not elapsed since the intermediate molded body was molded in the cavity, and the temperature of the intermediate molded body is high and the intermediate molded body is still in a soft state. Even if there is, it is possible to suppress the pressing trace of the pressing member from remaining on the intermediate molded body. Therefore, the cooling time after the molding of the intermediate molded body can be reduced, and the productivity can be improved.
Also, since the size of the inner cylinder in the tire width direction is smaller than the size of the outer cylinder in the tire width direction, for example, the treads arranged on the outer peripheral surface of the outer cylinder are increased in the tire width direction. It is possible to reduce the weight of the non-pneumatic tire while securing a large installation area. Thereby, wear resistance and operability can be improved.
When the distances H0, H1, and H2 satisfy the above-described expressions (1) and (2), the lengths of the inner straight portion and the outer straight portion can be appropriately maintained, and the pressing member and the intermediate It is possible to easily ensure the durability as a non-pneumatic tire while ensuring the contact area with the molded body.
That is, when (H1 / H0) or (H2 / H0) is 0.1 or less, it is difficult to secure a sufficient contact area between the pressing member and the intermediate molded body, and there is a possibility that productivity cannot be improved.
When (H1 / H0) or (H2 / H0) is 0.35 or more, the inner straight portion and the outer straight portion become too long, and the inner straight portion and the outer straight portion are separated from each other at the side edge of the connecting member. The connecting center becomes shorter. As a result, in the central portion, from the inner straight portion to the outer straight portion, the tire is largely displaced in the tire width direction, for example, a connection portion between the center portion and the inner straight portion, or a middle portion and the outer straight portion. A stress concentration portion is easily formed at the connection portion, and the durability may be affected.

  In the non-pneumatic tire according to the present invention, the connecting member may be a plate material whose front and back surfaces face the tire circumferential direction.

  In this case, since the connecting member is a plate member whose front and back surfaces are oriented in the tire circumferential direction, for example, the connecting member is formed with the shortening of the cooling time after the molding of the intermediate molded body as described above. Molding defects including sink marks can be effectively suppressed.

  According to the present invention, productivity can be improved.

It is a side view of the non-pneumatic tire concerning a 1st embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line AA of the case body shown in FIG. 1, and is a diagram showing a mold in addition to the case body by a two-dot chain line. FIG. 2 is a view for explaining the method for manufacturing the non-pneumatic tire shown in FIG. 1, and is a view corresponding to an AA sectional view shown in FIG. 1.

(1st Embodiment)
As shown in FIGS. 1 and 2, the non-pneumatic tire 1 according to the first embodiment includes a mounting body 11 mounted on an axle (not shown), a cylindrical inner cylindrical body 12 exteriorly mounted on the mounting body 11, and an inner body 12. A ring member 14 having a cylindrical outer cylinder 13 surrounding the cylinder 12 from the outside in the tire radial direction, a connecting member 15 for coupling the mounting body 11 and the outer cylinder 13, and a casing provided on the outer cylinder 13. Cylindrical tread member 16.

  Note that the non-pneumatic tire 1 of the present embodiment may be employed in a small-sized vehicle or the like that runs at a low speed, such as a handle-type electric wheelchair specified in JIS T 9208. The size of the non-pneumatic tire 1 is not particularly limited, but may be, for example, 3.00-8. Further, the non-pneumatic tire 1 may be adopted for a passenger car. The size in this case is not particularly limited, but may be, for example, 155 / 65R13.

  The above-mentioned attachment body 11, inner cylinder body 12, outer cylinder body 13, and tread member 16 are each arranged coaxially with a common axis. Hereinafter, this common axis is referred to as an axis (tire axis) O, a direction along the axis O is referred to as a tire width direction H, a direction orthogonal to the axis O is referred to as a tire radial direction, and a direction of orbiting around the axis O is referred to as a tire circumferential direction. In addition, the center part in the tire width direction H of each of the attachment body 11, the inner cylinder body 12, the outer cylinder body 13, and the tread member 16 coincides with each other.

The attachment body 11 connects the mounting cylinder 17 to which the tip of the axle is mounted, the outer ring 18 surrounding the mounting cylinder 17 from the outside in the tire radial direction, and the mounting cylinder 17 and the outer ring 18. And a plurality of ribs 19.
The mounting cylinder portion 17, the outer ring portion 18, and the rib 19 are integrally formed of a metal material such as an aluminum alloy. The mounting cylinder 17 and the outer ring 18 are each formed in a cylindrical shape, and are arranged coaxially with the axis O. The plurality of ribs 19 are arranged at equal intervals in the tire circumferential direction, for example.

  On the outer peripheral surface of the outer ring portion 18, a plurality of key grooves (not shown) which are depressed inward in the tire radial direction and extend in the tire width direction H are formed at intervals in the tire circumferential direction. The key groove portion is opened only on one side (for example, outside the vehicle body) in the tire width direction H on the outer peripheral surface of the outer ring portion 18 and is closed on the other side (for example, inside the vehicle body) in the tire width direction H. .

The inner cylindrical body 12 is formed in a cylindrical shape fitted to the outer ring portion 18. On the inner peripheral surface of the inner cylindrical body 12, a not-shown ridge is formed which protrudes inward in the tire radial direction and extends over the entire length in the tire width direction H. A plurality of the ridge portions are formed on the inner peripheral surface of the inner cylindrical body 12 at intervals in the tire circumferential direction, and are individually fitted into the key groove portions.
Then, the inner cylindrical body 12 is fixed to the mounting body 11 in a state where the ridge portions are fitted in the key groove portions. In the illustrated example, the plate 28 is screwed into the outer ring portion 18 at a position corresponding to the key groove portion from one side in the tire width direction H, so that the inner cylindrical body 12 is fixed to the attachment body 11. .

The central portion of the inner cylinder 12 in the tire width direction H and the central portion of the outer cylinder 13 in the tire width direction H are disposed at positions equivalent to the tire width direction H. The size of the inner cylinder 12 in the tire width direction H is smaller than the size of the outer cylinder 13 in the tire width direction H.
A plurality of connecting members 15 are provided between the mounting body 11 and the outer cylindrical body 13 along the tire circumferential direction, and connect the mounting body 11 and the outer cylindrical body 13 to be relatively elastically displaceable. The connecting member 15 is an elastically deformable plate whose front and rear surfaces face the tire circumferential direction.

  Both ends of the connecting member 15 are separately connected to the mounting body 11 and the outer cylindrical body 13, and one end (outer end 15 a) of the connecting member 15, which is an outer end in the tire radial direction, is connected to the connecting member 15. It is located on one side in the tire circumferential direction from the other end (inner end 15b), which is the inner end in the tire radial direction. The connecting member 15 gradually extends toward the other side in the tire circumferential direction from the outer side to the inner side in the tire radial direction.

  The plurality of connecting members 15 are separately arranged at positions between the inner cylinder 12 and the outer cylinder 13 that are rotationally symmetric with respect to the axis O. All the connecting members 15 have the same shape and size as each other, and the width of the connecting members 15 along the tire width direction H is equal to or less than the width of the outer cylinder 13 along the tire width direction H. The connection members 15 adjacent in the tire circumferential direction are not in contact with each other.

The tread member 16 is formed in a cylindrical shape, and integrally covers the outer peripheral surface side of the outer cylindrical body 13 over the entire area. The inner peripheral surface of the tread member 16 is in close contact with the outer peripheral surface of the outer cylinder 13 over the entire area. The tread member 16 is made of, for example, vulcanized rubber obtained by vulcanizing natural rubber and / or a rubber composition, or a thermoplastic material.
Examples of the thermoplastic material include a thermoplastic elastomer and a thermoplastic resin. Examples of the thermoplastic elastomer include amide-based thermoplastic elastomer (TPA), ester-based thermoplastic elastomer (TPC), olefin-based thermoplastic elastomer (TPO), styrene-based thermoplastic elastomer (TPS), and urethane specified in JIS K6418. System thermoplastic elastomer (TPU), crosslinked thermoplastic rubber (TPV), or other thermoplastic elastomer (TPZ).
Examples of the thermoplastic resin include a urethane resin, an olefin resin, a vinyl chloride resin, and a polyamide resin. In addition, it is preferable to form the tread member 16 from vulcanized rubber from the viewpoint of wear resistance.

By the way, the above-mentioned ring member 14 and connecting member 15 are integrally formed of, for example, a synthetic resin material. The synthetic resin material may be, for example, only one resin material, a mixture containing two or more resin materials, or a mixture containing one or more resin materials and one or more elastomers. Additives such as anti-aging agents, plasticizers, fillers, or pigments may be included.
Hereinafter, a unit in which the ring member 14 and the connecting member 15 are integrally formed is referred to as a case body 31 (intermediate molded body).

Inner straight portions 32 and outer straight portions 33 are provided on both side edges of the connecting member 15 in the tire width direction H, respectively.
The inner straight portion 32 is provided at an inner end in the tire radial direction at the both side edges. The inner straight portion 32 is disposed at a position equivalent to the side edge 12a of the inner cylinder body 12 in the tire width direction H in the tire width direction H, and is located on an orthogonal plane orthogonal to the axis O. In the present embodiment, both inner straight portions 32 at both side edges of the connecting member 15 in the tire width direction H are arranged at positions equivalent to the side edges 12a in the tire width direction H as described above. It is located on the orthogonal plane.

The outer straight portions 33 are provided at outer ends in the tire radial direction at the both side edges. The outer straight portion 33 is disposed at a position equivalent to the side edge 13a of the outer cylinder 13 in the tire width direction H in the tire width direction H, and is located on an orthogonal plane orthogonal to the axis O. In the present embodiment, both outer straight portions 33 at both side edges of the connecting member 15 in the tire width direction H are arranged at positions equivalent to the side edges 13a in the tire width direction H as described above. It is located on the orthogonal plane.
The central portion 34 connecting the inner straight portion 32 and the outer straight portion 33 at the side edge of the connecting member 15 is formed in the tire width direction H from the inside in the tire radial direction to the outside as shown in the example of the drawing. It is preferred that it extends linearly outward. However, the central portion 34 may extend in a curved shape that is convex or concave in the tire width direction H instead of extending linearly.

Here, in the present embodiment, in the tire radial direction and the tire width direction H, the tire passes through the inner end of the connecting member 15 in the tire radial direction (the connection portion with the connecting member 15 on the outer peripheral surface of the inner cylindrical body 12). In the cross section of the ring member 14 along the section (AA cross section shown in FIG. 1), the distances H0, H1, and H2 shown in FIG. 2 satisfy the relationship of the following equations (1) and (2).
0.1 <(H1 / H0) <0.35 (1)
0.1 <(H2 / H0) <0.35 (2)

The distance H0 is a distance along the tire radial direction between the connection portions with the connecting member 15 on the outer peripheral surface of the inner cylinder 12 and the inner peripheral surface of the outer cylinder 13 in the cross section.
The distance H1 is a distance from the connection portion on the outer peripheral surface of the inner cylindrical body 12 to the outer edge of the inner straight portion 32 in the tire radial direction in the cross section.
The distance H2 is a distance from the connection portion on the inner peripheral surface of the outer cylindrical body 13 to the inner edge of the outer straight portion 33 in the tire radial direction in the cross section.

  Next, an example of a mold 40 (a device for manufacturing the non-pneumatic tire 1) for forming the non-pneumatic tire 1 will be described. The mold 40 forms the case body 31 of the non-pneumatic tire 1.

  As shown in FIG. 2, the mold 40 includes a pair of mold members 41 and 42 that are detachably assembled in the tire width direction H. A cavity 40 a for molding the case body 31 is defined between the pair of mold members 41 and 42. The pair of mold members 41 and 42 are a first mold member 41 released from the case body 31 to one side in the tire width direction H and a second mold member released from the case body 31 to the other side in the tire width direction H. 42.

Here, as shown in FIG. 3, at least one of the pair of mold members 41 and 42 is provided with a pressing member 43. The pressing member 43 presses the case body 31 formed in the cavity 40a and in close contact with the mold members 41 and 42 in the tire width direction H to release the case body 31 from the mold members 41 and 42. The pressing member 43 is provided on the first mold member 41. The pressing member 43 integrally presses the side edge 12a and the inner straight portion 32 of the inner cylinder 12 and the side edge 13a and the outer straight portion 33 of the outer cylinder 13 respectively. The pressing member 43 includes a plurality of protruding pins 43a. Each protruding pin 43a is connected to the side edge 12a and the inner straight portion 32 of the inner cylinder 12, or the side edge 13a and the outer straight portion 32 of the outer cylinder 13. 33 is pressed to the other side in the tire width direction H.
In the present embodiment, an injection port (not shown) is provided in the second mold member 42, which is a mold member not provided with the pressing member 43. That is, the pressing member 43 is provided on a mold member (first mold member 41) opposite to the mold member (second mold member 42) having the injection port.

  Next, an example of a method of manufacturing the non-pneumatic tire 1 for forming the non-pneumatic tire 1 using the mold 40 will be described.

  First, the case body 31 is formed. Here, the case body 31 can be integrally formed by, for example, injection molding in which a molding material is injected into the cavity 40a from the injection port. As the injection molding, a general method of simultaneously molding the entire case body 31 may be used, or a part of the inner cylinder body 12, the outer cylinder body 13, and the connecting member 15 may be used as an insert product and the rest may be used as an insert product. Insert molding by injection molding or so-called two-color molding may be used. When the entire case body 31 is injection-molded at the same time, a plurality of the ridges formed on the inner cylindrical body 12 may be used as gate parts. When performing injection molding, the inner cylinder 12, the outer cylinder 13, and the connecting member 15 may be formed of different materials from each other, or may be formed of the same material. Examples of the material include a metal material and a resin material. From the viewpoint of weight reduction, a resin material, particularly, a thermoplastic resin is preferable.

In the present embodiment, the case body 31 is formed in the cavity 40a of the mold 40, and then the pair of mold members 41 and 42 are released from the case body 31.
At this time, first, the second mold member 42 is moved in the tire width direction H while the case body 31 is brought into close contact with the first mold member 41 provided with the pressing member 43 among the pair of mold members 41 and 42. Then, it is released from the case body 31.
After that, the first mold member 41 is released from the case body 31. At this time, as shown in FIG. 3, in the case body 31 in close contact with the first mold member 41, the side edge 12 a and the inner straight portion 32 of the inner cylinder 12, and the side edge 13 a of the outer cylinder 13 and the outer edge 13 a The linear portions 33 are pressed integrally in the tire width direction H by the pressing members 43. In other words, when the pressing member 43 presses the case body 31 in the tire width direction H, when viewed from the tire width direction H, at least a part of the pressing member 43 is formed by the side edge 12 a of the inner cylinder 12 or the outer cylinder 12. It overlaps the side edge 13a of the body 13. Thereby, the case body 31 is protruded from the first mold member 41 in the tire width direction H and is released. In the case body 31, the inner cylindrical body 12 and the outer cylindrical body 13 are more easily adhered to the mold 40 than the connecting member 15. The case body 31 can be reliably released from the mold 40 by overlapping the side edge 13 a of the outer cylinder body 13.
After that, the non-pneumatic tire 1 can be formed by externally attaching the inner cylindrical body 12 to the attachment body 11 and attaching the tread member 16 to the outer cylindrical body 13.

As described above, according to the method of manufacturing the non-pneumatic tire 1, the mold 40, and the non-pneumatic tire according to the present embodiment, in the case body 31 that is in close contact with the first mold member 41, The side edge 12a and the inner straight portion 32 and the side edge 13a and the outer straight portion 33 of the outer cylindrical body 13 are pressed integrally in the tire width direction H by a pressing member 43, respectively. It protrudes from the member 41 and is released. Here, the inner linear portion 32 is disposed at a position equivalent to the side edge 12a of the inner cylindrical body 12 in the tire width direction H, is located on a plane orthogonal to the axis O, and the outer linear portion 33 is Since the pressing member 43 is disposed at a position equivalent to the side edge 13a of the outer cylindrical body 13 in the tire width direction H and on a plane orthogonal to the axis O, the pressing member 43 moves the case body 31 as described above. When pressing, the contact area between the pressing member 43 and the case body 31 can be secured. Accordingly, when the pressing member 43 presses the case body 31, no time has elapsed since the case body 31 was molded in the cavity 40a, and the temperature of the case body 31 is high and the case body 31 is still soft. Even in the state, it is possible to suppress the pressing mark of the pressing member 43 from remaining on the case body 31. Therefore, the cooling time after the case body 31 is formed can be shortened, and the productivity can be improved.
Further, since the size of the inner cylinder 12 in the tire width direction H is smaller than the size of the outer cylinder 13 in the tire width direction H, for example, the inner cylinder 12 is disposed on the tread member 16 on the outer peripheral surface of the outer cylinder 13. It is possible to reduce the weight of the non-pneumatic tire 1 while widening the tread in the tire width direction H to secure a large installation area. Thereby, wear resistance and operability can be improved.

  In addition, since the connecting member 15 is a plate member whose front and back surfaces face the tire circumferential direction, the cooling time after the molding of the case body 31 is shortened as described above. It is possible to effectively suppress molding defects including sink marks that occur.

Further, since the distances H0, H1, and H2 satisfy the relations of the expressions (1) and (2), the lengths of the inner straight portion 32 and the outer straight portion 33 can be appropriately held, respectively. It is possible to easily ensure the durability of the non-pneumatic tire 1 while securing the contact area between the pressing member 43 and the case body 31.
That is, if (H1 / H0) or (H2 / H0) is 0.1 or less, it is difficult to secure a sufficient contact area between the pressing member 43 and the case body 31, and it may not be possible to improve the productivity. .
When (H1 / H0) or (H2 / H0) is 0.35 or more, the inner straight portion 32 and the outer straight portion 33 become too long, and the central portion 34 at the side edge of the connecting member 15 becomes short. . As a result, from the inner straight portion 32 to the outer straight portion 33 at the center portion 34, the tire is greatly displaced in the tire width direction H. For example, a connection portion between the center portion 34 and the inner straight portion 32 or the center portion 34 A stress concentration portion is likely to be formed at a connection portion between the outer straight portion 33 and the outer straight portion 33, which may affect durability.

  Note that the technical scope of the present invention is not limited to the above embodiment, and various changes can be made without departing from the spirit of the present invention.

  For example, the distances H0, H1, and H2 do not have to satisfy the relationship of the above equations (1) and (2).

  In addition, it is possible to appropriately replace the components in the above-described embodiment with well-known components without departing from the spirit of the present invention, and the above-described modifications may be appropriately combined.

DESCRIPTION OF SYMBOLS 1 Non-pneumatic tire 11 Mounting body 12 Inner cylinder 13 Outer cylinder 14 Ring member 15 Connection member 31 Case body (intermediate molded body)
32 inner straight portion 33 outer straight portion H tire width direction 40 mold 40a cavities 41, 42 mold member 43 pressing member

Claims (5)

An attachment body attached to the axle;
A ring member including an inner cylinder that is externally mounted on the attachment body, and an outer cylinder that surrounds the inner cylinder from the outside in the tire radial direction;
A plurality of disposed along the circumferential direction of the tire between the inner cylindrical body and the outer cylindrical body, a connecting member that connects these two cylindrical bodies, a non-pneumatic tire comprising:
The size of the inner cylinder in the tire width direction is smaller than the size of the outer cylinder in the tire width direction,
At the inner ends in the tire radial direction at both side edges in the tire width direction of the connection member, the side edges in the tire width direction of the inner cylinder are arranged at positions equivalent to the tire width direction, and the tire shaft is An inner straight part located on an orthogonal plane orthogonal to the plane is provided,
At the outer end in the tire radial direction at both side edges in the tire width direction of the connecting member, the outer cylindrical body is disposed at a position equivalent to the side edge in the tire width direction of the outer cylinder in the tire width direction. An outer linear portion located on an orthogonal plane orthogonal to the plane is provided ,
In the cross section of the ring member along the tire radial direction and the tire width direction through the inner end of the connecting member in the tire radial direction, the outer peripheral surface of the inner cylindrical body and the inner peripheral surface of the outer cylindrical body, respectively. A distance H0 along the tire radial direction between the connecting portions with the connecting member, and a distance H1 from the connecting portion on the outer peripheral surface of the inner cylindrical body to an outer edge of the inner straight portion in the tire radial direction. , And the distance H2 from the connection portion on the inner peripheral surface of the outer cylinder to the inner edge of the outer straight portion in the tire radial direction is expressed by the following equations (1) and (2). A non-pneumatic tire characterized by satisfying .
0.1 <(H1 / H0) <0.35 (1)
0.1 <(H2 / H0) <0.35 (2)   2. The non-pneumatic tire according to claim 1, wherein the connecting member is a plate member whose front and back surfaces face in a tire circumferential direction. 3. A mold for forming the non-pneumatic tire according to claim 1 or 2 ,
With a pair of mold members that are assembled to be separable in the tire width direction,
A cavity is formed between the pair of mold members to form an intermediate molded body in which the ring member and the connection member are integrally formed,
A pressing member that presses, in at least one of the pair of mold members, the intermediate molded body formed in the cavity and closely adhered to the mold member in a tire width direction to release the mold member from the mold member. Is provided,
The mold, wherein the pressing member integrally presses the side edge and the inner straight portion of the inner cylinder and the side edge and the outer straight portion of the outer cylinder, respectively.   An attachment body attached to the axle;
  A ring member including an inner cylinder that is externally mounted on the attachment body, and an outer cylinder that surrounds the inner cylinder from the outside in the tire radial direction;
  A plurality of connection members are provided along the tire circumferential direction between the inner cylinder and the outer cylinder, and a connecting member that connects these two cylinders to each other,
  The size of the inner cylinder in the tire width direction is smaller than the size of the outer cylinder in the tire width direction,
  At the inner ends in the tire radial direction at both side edges in the tire width direction of the connection member, the side edges in the tire width direction of the inner cylinder are arranged at positions equivalent to the tire width direction, and the tire shaft is An inner straight part located on an orthogonal plane orthogonal to the plane is provided,
  At the outer end in the tire radial direction at both side edges in the tire width direction of the connecting member, the outer cylindrical body is disposed at a position equivalent to the side edge in the tire width direction of the outer cylinder in the tire width direction. A mold that forms a non-pneumatic tire provided with an outer linear portion located on an orthogonal plane orthogonal to the orthogonal plane,
  With a pair of mold members that are assembled to be separable in the tire width direction,
  A cavity is formed between the pair of mold members to form an intermediate molded body in which the ring member and the connection member are integrally formed,
  A pressing member that presses, in at least one of the pair of mold members, the intermediate molded body formed in the cavity and closely adhered to the mold member in a tire width direction to release the mold member from the mold member. Is provided,
  The mold, wherein the pressing member integrally presses the side edge and the inner straight portion of the inner cylinder and the side edge and the outer straight portion of the outer cylinder, respectively. A method for producing a non-pneumatic tire using the mold according to claim 3 or 4, wherein the non-pneumatic tire is formed,
Molding the intermediate molded body in the cavity,
Releasing the pair of mold members from the intermediate molded body,
The step of releasing,
A step of releasing the other mold member from the intermediate molded body, in a state where the intermediate molded body is brought into close contact with one of the mold members provided with the pressing member,
In the intermediate molded body in close contact with the one mold member, the side edge of the inner cylinder and the inner straight portion, and the side edge of the outer cylinder and the outer straight portion, respectively, by the pressing member A process in which the intermediate molded body is pressed integrally from the one mold member in the tire width direction to release the mold.

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