JP5010122B2 - Hollow tire - Google Patents

Description

  The present invention relates to a hollow tire having a wheel and a tire attached to a rim portion of the wheel.

  Conventionally, tires as described in Patent Documents 1 to 3 are known as hollow tires as described above.

However, in any of the patent documents, the member provided inside the tire is mainly for the purpose of improving the gripping force, and the concept of filling air from the tire surface via the air injection needle is not disclosed.
JP-A-10-129210 JP-A-9-286203 JP-A-6-327844

  In view of such a conventional situation, the present invention provides a hollow tire that can easily fill the inside of a tire and maintain airtightness while maintaining a high grip force. For the purpose.

  In order to achieve the above object, the hollow tire according to the present invention is characterized in that in a hollow tire having a wheel and a tire attached to a rim portion of the wheel, the tire is bonded to the rim portion and is airtight inside. A hollow part is formed, and a sealing material having elasticity is provided on a surface forming the hollow part. The sealing material seals a hole that allows the hollow part and the outside to communicate with each other. The opposite side of the surface forming the hollow portion is an elastic member, and the opposite surface of the hollow portion is a reinforcing material.

  With this feature, air can be filled from the outer peripheral surface, and the hole that allows the hollow portion and the outside to communicate with each other can be closed with a sealing material after filling, so that the tire can be maintained in a pressurized state.

  In the above feature, the hole is preferably a through hole formed by an air injection needle that penetrates the sealing material. The hole may be an insertion hole for inserting an air injection needle provided in the rim portion.

In order to achieve the above object, another feature of the hollow tire according to the present invention is a hollow tire having a wheel and a tire attached to a rim portion of the wheel, wherein the tire is bonded to the rim portion to be airtight inside. Forming a hollow portion in a state, and providing a sealing material having elasticity on a surface forming the hollow portion, and the sealing material seals a hole capable of communicating the hollow portion and the outside; The hole is an insertion hole for inserting an air injection needle provided in the rim portion.
Moreover, the opposing side of the surface which forms the said hollow part of the said sealing material is the said elastic member, and a hollow part opposing surface is good also as a reinforcing material. In particular, it is desirable that the elastic member is a rubber-based adhesive material and the reinforcing material is formed of a nonwoven fabric.

  Due to this feature, even when a large impact is applied to the tire, since the hollow portion facing surface is a reinforcing material, it prevents adhesion deformation of the sealing material to the rim, and also improves the grip force by the reinforcing material. be able to.

  The sealing material may be integrally formed on the inner peripheral surface of the hollow tire. The hollow tire can also be used as a radio control tire.

  According to the characteristics of the hollow tire according to the present invention, air can be easily filled from the tire surface by the sealing material, and the airtightness inside the tire can be maintained. Furthermore, it became possible to maintain the grip force with high performance by the sealing material.

  Other objects, configurations, and effects of the present invention will become apparent from the following embodiments of the present invention.

Next, the present invention will be described in more detail with reference to FIGS.
As shown in FIG. 1, the hollow tire 1 according to the present invention generally includes a tire 10, a wheel 20, and a sealing material 30.

  The tire 10 is formed of a rubber-based material having rigidity capable of exerting a grip force, and as shown in FIG. 1A, a pair of beat portions 14 and 14 and sidewall portions 15 and 15 are formed symmetrically. To do. The beat portion 14 is inclined with respect to the center portion of the tire 10 from the sidewall portion 15, and the tip of the beat portion 14 abuts on a convex portion 26 provided on the wheel 20. The side wall portion 15 is provided with a notch portion 15 a that fits with the upper portion of the side surface portion 22 of the wheel 20.

  As shown in FIGS. 1 and 2, the wheel 20 includes a rim portion 21, a flat portion 22, and a side surface portion 23, and is attached to an axle via a disk 27. The flat portion 22 is provided with a pair of convex portions 26 and 26 that come into contact with the beat portions 14 and 14. The side surface portion 23 is provided with an injection hole 24 substantially at the center. The injection hole 24 communicates with a hollow filling portion 25 formed by the beat portion 14 and the rim portion 21 that are in contact with the convex portion 26. Yes.

  An adhesive is injected into the filling portion 25 in order to adhere the tire 10 and the wheel 20 and maintain the airtightness of the hollow portion 13. As shown in FIG. 1A, the injection hole 24 and the filling portion 25 are provided symmetrically with respect to the center of the wheel 20, and as shown in FIG. 1B, two injection holes 24 are provided symmetrically in the vertical direction. Yes.

  As shown in FIG. 1B, the sealing material 30 is annularly bonded to the tire inner peripheral surface 12, and as shown in FIG. 3, the tire inner peripheral surface 12 side is an elastic member formed of a butyl rubber-based adhesive material. 31 and the hollow portion 13 side has a two-layer structure including a reinforcing material 32 formed of a nonwoven fabric. The elastic member 31 may be a rubber-based pressure-sensitive adhesive material having adhesiveness for adhering the sealing material 30 to the tire inner peripheral surface 12 and viscosity capable of flowing into the through hole 101 by the air pressure of the hollow portion 13. It is not limited to the above-mentioned butyl rubber adhesive. Further, the reinforcing material 32 prevents the elastic member 31 from adhering to the flat portion 22 of the wheel 20, and the sealing material 30 adheres to the wheel 20 even when a strong impact is applied to the tire 10. It is possible to prevent the deformation of the tire 10 caused by the above. Furthermore, the strength reduction accompanying deformation | transformation of the sealing material 30 by the flow of the elastic member 31 mentioned later is also prevented.

Next, attachment of a tire and a rim will be described.
The tip of the beat portion 14, 14 of the tire 10 having the sealing material 30 bonded to the tire inner peripheral surface 12 is brought into contact with the convex portions 26, 26, and the notch portion 15 a provided in the sidewall portion 15 is provided on the side surface of the wheel 20 The upper portion of the portion 23 is fitted. Then, as shown in FIG. 2, the adhesive is injected into the filling portion 25 from the injection hole 24 provided in the side surface portion 23, the beat portion 14 and the rim portion 21 are adhered, and the tire 10 and the wheel 20 are fixed. Thereby, it becomes the hollow tire 1 in which the hollow part 13 excellent in airtightness was formed inside the tire.

Next, the filling of air into the hollow portion 13 will be described.
As shown in FIG. 3A, air is injected by penetrating the air filling needle 100 from the tire outer peripheral surface 11. When the air A is filled into the hollow portion 13 from the air filling needle 100, the hollow portion 13 is inflated by the air pressure of the injected air, and the tire 10 is inflated, as shown in FIG. The elastic member 31 flows toward the center of the through hole 101a due to its air pressure and elasticity, and the elastic members 31 adhere to each other to form a lid portion 31a and close the through hole 101a. In the case of an elastic member having a low viscosity, as shown in FIG. 3C, a position where the external air pressure, the air pressure, and the frictional force between the elastic member 31 and the through-hole 101a formed in the tire are balanced. Until the elastic member 31 flows, the lid portion 31a is formed and the through hole 101a is closed.

  Although the sealing member 30 is slightly deformed by the flow of the elastic member 31, the reinforcing member 32 prevents the sealing member 30 from being deformed and maintains the strength. Further, when the lid portion 31 a is formed at a position higher than the outer peripheral surface 11 of the tire 10, it can be confirmed that the amount of air A injected into the hollow portion 13 is too large.

  Next, still another embodiment of the present invention will be described. Note that members similar to those in the above-described embodiment are denoted by the same reference numerals.

  In the present embodiment, unlike the first embodiment, the tire 10 and the sealing material 30 are formed integrally. As shown in FIG. 4, the molding machine 40 generally includes a pair of upper and lower molds 41 and 42, a pair of upper and lower inserts 44 and 45, and a center core 46.

  The pair of upper and lower molds 41 and 42 are provided so as to be movable up and down, and the upper and lower molds 41 and 42 have a space in which the core 46 and the upper and lower inserts 43 and 44 are inserted. The pair of upper and lower nests 43 and 44 has a hole into which the shaft portion 46a of the center core 46 is inserted at the center, and is formed in a cylindrical shape having a substantially U-shaped cross section. The inner surfaces of the upper and lower inserts 43 and 44 are formed with curved surfaces matching the shape of the outer peripheral surface of the tire, and the contact surfaces of the upper and lower inserts 43 and 44 are formed with a pressure inlet 45a in the molding portion of rubber for tire molding. The upper mold 41 and the upper insert 43 are provided with injection holes 45 for injecting tire molding rubber.

  As shown in FIG. 5, the center core 46 includes a shaft portion 46 a and a central portion 46 b, and the central portion 46 b is formed in a circular shape having the same width as the tire diameter with the width of the tire inner surface. A sealing material 30 is wound around. A molding portion 47 serving as a tire is formed by the central portion 46 b of the inner core 46 and the inner surfaces of the upper and lower inserts 43 and 44.

  In the integral molding, the upper and lower inserts 43 and 44 are fitted to the center core 46 around which the sealing material 30 is wound around the outer periphery of the central portion 46b, and the upper and lower molds 41 and 42 are further fitted thereto. Then, a tire molding rubber is press-fitted from the injection hole 45, and the molding part 47 is filled with the rubber via the pressure inlet 45a to mold the tire 10. The sealing material 30 is molded integrally with the tire 10 by the rubber filled in the molding part 47.

Finally, further embodiments will be mentioned.
In the said embodiment, although the sealing material 30 was adhere | attached on the tire internal peripheral surface 12, the width | variety of the sealing material 30 is not specifically limited, For example, the sealing material 30 is used between the beat parts 14 and 14. It may be adhered to the entire inner surface of the tire 10. Furthermore, the sealing material 30 is not limited to being provided annularly along the tire inner surface, and may be partially provided on the tire inner surface. However, when providing partially, it is desirable to provide it symmetrically with respect to the center of the tire or symmetrically with respect to the middle line of the tire width so that the entire tire can be balanced.

  In the above embodiment, the sealing material 30 is provided on the inner surface 12 of the tire. However, as shown in FIG. 6, an insertion hole 101b for inserting the air injection needle 100 may be provided in the flat part 22 of the rim part 21, and the sealing material 30 may be provided so as to cover the insertion hole 101b. Also in this embodiment, the sealing material 30 may be provided in an annular shape along the flat portion 22 of the rim portion 21 as in the above embodiment, and is provided partially so as to balance the entire tire. It doesn't matter. In addition, it is not restricted to the flat part 22, You may provide the sealing material 30 so that an insertion hole may be provided on the convex part 26 and the insertion hole 101b may be covered.

  In the above embodiment, the encapsulant 30 has a two-layer structure, but may have a multilayer structure in order to maintain the strength of the encapsulant 30.

  In the above embodiment, two injection holes 24 are provided on the wheel side surface symmetrically in the vertical direction. However, the injection holes 24 may be provided at a plurality of locations at appropriate intervals according to the size of the tire.

  In the above embodiment, a rubber-based material is used for the tire 10, but any material that can exhibit a gripping force may be used. For example, a soft plastic may be used. Further, a butyl rubber-based adhesive material was used for the elastic member 31. However, the adhesive is not limited to a butyl rubber adhesive, and may be a rubber adhesive such as natural rubber, butadiene rubber, isoprene, and nitrile. Each rubber-based pressure-sensitive adhesive material can be applied as long as it is elastic or viscous enough to close the hole regardless of whether it is vulcanized or unvulcanized. However, when the sealing material is bonded to the surface forming the hollow portion, it must be an adhesive material having adhesiveness. Further, the wheel and the rim portion are formed of plastic, metal or the like.

  In addition, the code | symbol described in the claim | item of the claim is only for the convenience of contrast with drawing, and this invention is not limited to the structure of an accompanying drawing by this entry.

  The present invention can be used as a tire for toys, and can also be used as a tire for passenger cars, motorcycles, bicycles, and the like.

(A) is a fragmentary sectional view of the hollow tire which concerns on this invention, (b) is a side view of the hollow tire which concerns on this invention. It is an expanded sectional view near a rim part. It is an expanded sectional view near a sealing material, (a) is a state at the time of air injection, (b) is a state in which a lid is formed on the sealing material, (b) is a lid in a through hole in a tire. Each formed state is shown. It is sectional drawing of the shaping | molding die in other embodiment which concerns on this invention. It is a perspective view of a center core. It is the figure corresponding to Drawing 1 (a) in other embodiments concerning the present invention.

Explanation of symbols

1: hollow tire, 10: tire, 11: outer peripheral surface, 12: inner peripheral surface, 13: hollow portion, 14: beat portion, 15: sidewall portion, 15a: notch portion, 20: wheel, 21: rim portion, 22: flat part, 23: side part, 24: injection hole, 25: filling part, 26: convex part, 27: disk, 30: sealing material, 31: elastic member, 31a: sealing part, 32: reinforcing material 40: molding machine, 41: upper mold, 42: lower mold, 43: upper nesting, 44: lower nesting, 45: injection hole, 46: center, 47: molding part, 100: air injection needle, 101: hole 101a: through hole, 101b: insertion hole, A: air

Claims (8)

A hollow tire having a wheel and a tire attached to a rim portion of the wheel,
The tire is bonded to the rim portion to form an airtight hollow portion inside,
Provide a sealing material having elasticity on the surface forming the hollow portion,
This sealing material seals the hole that can communicate the hollow portion and the outside,
A hollow tire in which an opposite side of a surface forming the hollow portion of the sealing material is an elastic member and a surface opposite the hollow portion is a reinforcing material. The hollow tire according to claim 1, wherein the hole is a through hole formed by an air injection needle that penetrates the sealing material. The hollow tire according to claim 1, wherein the hole is an insertion hole into which an air injection needle provided in the rim portion is inserted. A hollow tire having a wheel and a tire attached to a rim portion of the wheel,
The tire is bonded to the rim portion to form an airtight hollow portion inside,
Provide a sealing material having elasticity on the surface forming the hollow portion,
This sealing material seals the hole through which the hollow portion can communicate with the outside,
A hollow tire in which the hole is an insertion hole into which an air injection needle provided in the rim portion is inserted. The hollow tire according to claim 4, wherein an opposite side of a surface forming the hollow portion of the sealing material is an elastic member, and a hollow portion opposing surface is a reinforcing material. The hollow tire according to claim 1, wherein the elastic member is a rubber-based adhesive material, and the reinforcing material is formed of a nonwoven fabric. The hollow tire according to claim 1, wherein the sealing material is integrally formed on an inner peripheral surface of the hollow tire. The hollow tire according to claim 1, wherein the hollow tire is a radio control tire.

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