JP2009051265A - Member for preventing blowout of tire and wheel assembly - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a member for preventing the blowout of a tire capable of being attached to the tire favorably while preventing the occurrence of the blowout excellently, and to provide a wheel assembly. <P>SOLUTION: The member for preventing the blowout of the tire is arranged circularly between a section closer to the outside in a tire radial direction of the inner circumferential surface of the tire for a two-wheeled vehicle and the outer circumferential surface of a tube. A fiber substrate 13 is formed by impregnating or covering fiber with resin or rubber, and a buffer material 14 is arranged at the inner circumferential side of the fiber substrate 13. By this constitution, the member 5 for preventing the blowout holding the substrate 13 in a wrinkle-free state can be obtained, and the member 5 can be attached easily and favorably in the wrinkle-free state along the inner circumferential surface of the tire. Furthermore, since the tube and the friction member 14 are arranged in a state of contacting with each other, the blowout of the tube caused by inner friction can be suppressed to the upmost. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a puncture-preventing member that prevents a tire for a motorcycle from being punctured, and a wheel assembly in which the puncture-preventing member is assembled.

  In general, a bicycle tire is configured by being mounted on a rim forming an inner ring portion of a wheel in a state in which a tube into which air is injected is installed. Examples of puncture factors other than mischief of this bicycle tire include “stabbed puncture”, “riding puncture” (so-called rim strike puncture), and “internal friction”.

  Here, “stabbed object puncture” refers to sharp objects such as sharp metal or glass pieces that have fallen on the ground, pierced into the tire from the outer peripheral surface of the tire, creating holes in the tube, and releasing air from the tube. It is caused by.

  “Riding puncture (so-called rim-punching puncture)” is a state in which the tube is pinched between the stepped portion and the rim and crushed when riding on the stepped portion with a relatively low air pressure in the tube. This occurs when the tube is compressed until it cracks and the tube cracks and the air in the tube escapes.

  “Internal friction” means that a tire generally made of a hard rubber material or the like and a tube made of a soft rubber material or the like rub against each other inside to produce friction, and the friction part of the tube is damaged to make a hole. This is caused by the escape of air in the tube. In many cases, the internal friction is generated between a portion of the inner peripheral surface of the tire that is greatly deformed when the tire comes into contact with the outer side in the tire radial direction and the outer peripheral surface of the tube facing the inner friction surface.

  In this punctured state, if the rider forcibly rides a bicycle, the tire and the tube from which air has been removed are sandwiched between the grounding surface and the rim, and the impact force from the grounding surface and the rim. It often acts on the tube without being weakened, and is severely damaged, such as having many holes in the tube, making it impossible to use afterwards.

  As a method of preventing puncture of such a bicycle tire, an annular tire puncture prevention member is arranged between the outer peripheral portion of the tube and the outer peripheral surface of the tube on the inner peripheral surface of the motorcycle tire. The method of setting is already known. As a tire puncture prevention member, Patent Document 1 discloses a member using a fiber material using a woven fabric made of warp and weft. In the puncture-preventing member disclosed in Patent Document 1, warp yarns and weft yarns made of high-rigidity fibers are arranged in an appropriate arrangement on a part of the warp yarns and weft yarns of the fabric.

  When the puncture-preventing member made of the fiber material as described above is interposed between the tire and the tube, when the stabbed object is pierced from the oblique direction through the tire, the tip of the stabbed object pierces the fiber, or the fiber It is difficult to penetrate the puncture-preventing member by being pinched in between, and the occurrence of puncture can be reduced.

  However, as described above, since the position of warp and weft is not restricted with respect to the direction in which these yarns are arranged, simply by using a fiber material knitted with fibers, the stings are placed on the surface of the fiber material. In contrast, when fibers are pierced in a direction substantially perpendicular to each other, gaps between the fibers cause misalignment (position shift), creating a gap between the fibers at the entry point of the stabbed object, and the stabbed object enters through this gap. There is a problem that it reaches the tube and cannot fully perform the puncture prevention performance.

  Also, when riding a bicycle tire on a stepped part etc., the space between the fibers spreads, and the corner part of the stepped part that broke into the tire enters between these fibers and the tube cracks , There is a risk that the function of preventing punctures will be insufficient.

The inventors of the present applicant have conceived that a fiber material used as a member for preventing puncture is coated or impregnated with a resin or rubber as a method for dealing with these problems.
As described above, when a fiber body in which a fiber material is coated or impregnated with a resin or rubber is used as a puncture-preventing member, fibers are not misaligned. And the occurrence of puncture punctures can be minimized. Since the fibrous body is separate from the tire, when the stabbed object penetrates through the tire and enters the inside, the fibrous body is separated from the tire and deformed to the tube side. Thus, the occurrence of the puncture puncture can be satisfactorily suppressed by deforming according to the puncture condition of the stab. In addition, since the gap between the fibers does not widen, it is possible to prevent the corner portion of the stepped portion that breaks into the tire from entering, and to prevent the occurrence of riding-up puncture.
Japanese Patent Laid-Open No. 10-16523

  However, when using a fiber body in which fibers or fibers are coated or impregnated as a puncture prevention member as described above, the puncture prevention member made of this fiber body must be mounted along the inner surface of the tire. However, since this fibrous body has a thick fabric shape, wrinkles may occur when worn, and it takes a lot of time and effort to carefully wear it so as not to cause wrinkles. . Further, when wrinkles are formed, the portions overlap and become thicker, so that they are easily rubbed with the tube, and there is a high possibility that the tube will puncture due to internal friction occurring at this portion.

  In addition, when the above fibrous body is used as a puncture-preventing member, it is expected that the fiber and the tube will come into contact with each other at the contact portion between the fibrous body and the tube and rub against each other to generate internal friction. There is a possibility that the occurrence of puncture due to can not be suppressed.

  The present invention solves the above-described problems, and provides a tire puncture prevention member and a wheel assembly that can prevent the occurrence of punctures and can also be favorably attached to a tire. It is intended.

  In order to solve the above-described problems, the tire puncture preventing member according to the present invention is annularly disposed between the radially outer portion of the inner peripheral surface of the tire for a motorcycle and the outer peripheral surface of the tube. A member for preventing puncture of a tire, wherein a fiber base is formed by impregnating or covering a fiber with resin or rubber, and a buffer material is disposed on an inner peripheral side of the fiber base.

  With the above configuration, by providing the buffer material on the inner peripheral side of the fiber base, it is possible to obtain a puncture-preventing member that can hold the fiber base without wrinkles. It can be easily and satisfactorily mounted along the inner peripheral surface with no wrinkles. Further, since the buffer material is disposed in contact with the tube without contacting the fiber, it is possible to minimize the puncture of the tube due to internal friction.

  Further, the member for preventing puncture of a tire according to the present invention is characterized in that the fiber has a high strength and a high elastic modulus, so that a stinging object penetrates the fiber itself by cutting or invading it. This can be prevented more reliably.

  In addition, the tire puncture prevention member of the present invention is characterized in that the cushioning material is softer than the fiber base and is equivalent to or softer than the tube, thereby causing the tube to puncture due to internal friction. It can prevent more reliably.

In the tire puncture prevention member of the present invention, the cushioning material is wider than the fiber base, and both ends of the cushioning material extend in the width direction from both ends of the fiber base. And
With this configuration, when the puncture-preventing member is mounted, the side surfaces of both ends of the fiber base are disposed so as to be covered with the wide cushioning material, and the side surfaces of both ends of the relatively hard fiber base come into contact with the tube. This can be reliably prevented, and as a result, the tube can be prevented more reliably from being punctured by internal friction.

  The wheel assembly of the present invention is characterized in that the puncture-preventing member having the above characteristics is disposed between the inner peripheral surface of a tire for a motorcycle and the outer peripheral surface of the tube.

  As described above, according to the present invention, as a tire puncture-preventing member, by using a fiber base impregnated with or coated with resin or rubber on a fiber, it is possible to prevent misalignment (position shift) between fibers, The occurrence of puncture punctures and climbing punctures can be satisfactorily suppressed, and a cushioning material is provided on the inner peripheral side of the fiber base, so that the fiber base can be kept free of wrinkles and this puncture can be prevented. The member can be easily and satisfactorily mounted along the inner peripheral surface of the tire without wrinkles, and the mounting work of the puncture-preventing member can be performed efficiently. Further, since the buffer material comes into contact with the tube, it is possible to minimize the puncture of the tube due to internal friction, and it is possible to further improve the reliability of the puncture prevention function.

Moreover, the function of preventing puncture can be further enhanced by using fibers of high strength and high elastic modulus as the fibers of the fiber base.
Further, as the cushioning material, the side surfaces of the both ends of the relatively hard fiber base are used by using a buffer material having a shape wider than the fiber base and having both ends of the buffer material extending in the width direction rather than both ends of the fiber base. Can be prevented from coming into contact with the tube, and puncture of the tube due to internal friction can be prevented more reliably, and the reliability can be further improved.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a sectional view of a wheel assembly according to an embodiment of the present invention (cross section including a tire shaft), and FIG. 2A is an overall side view of a single member for preventing puncture according to an embodiment of the present invention. 2 (b) and 2 (c) are a cross-sectional view (transverse cross section including the tire shaft) and an enlarged cross-sectional view of the puncture-preventing member, and FIGS. FIG. 4 is a cross-sectional view showing a state in which the stabbed object of the wheel assembly is stuck, and FIG. 5 is a cross-sectional view in the punctured state of the wheel assembly. Note that FIG. 5 only shows the ground contact surface below.

  As shown in FIG. 1, a wheel assembly 1 has a bead portion 3 a that is an inner peripheral end portion of a rubber tire 3 fitted in a rim 2 that forms an inner ring portion that is attached to an axle and spokes (not shown). The rubber tube 4 into which air is injected and the puncture-preventing member 5 according to the embodiment of the present invention are installed in an internal space constituted by the rim 2 and the tire 3. The puncture-preventing member 5 is disposed between a radially outward portion 3b in the tire radial direction and an outer peripheral surface of the tube 4 on the inner peripheral surface of a bicycle tire 3 as an example of a two-wheeled vehicle. The tire 3 is made of a hard rubber material, and the tube 4 is made of a soft rubber material. Further, 3 c in FIG. 1 is a crown portion of the tire 3.

  As shown in FIG. 2A, the overall shape of the puncture-preventing member 5 is annular when viewed from the side. Further, as shown in FIGS. 3A to 3E, the puncture-preventing member 5 includes high-strength and high-elasticity fibers (referred to as high-strength fibers) 11 (specifically, high-strength and high-elasticity, respectively). 2 (a) and (b) are formed by impregnating (or coating) rubber 12 (or resin) into a warp yarn 11a and a weft yarn 11b). The buffer material 14 is arranged on the inner peripheral side of the fiber base 13.

  Here, as the high-strength fiber 11, an aramid fiber, a polyethylene fiber, a polyarylate fiber, a PVA fiber (a synthetic fiber containing polyvinyl alcohol as a component), a PBO fiber (a polyparaphenylene benzobisoxazal fiber), or the like is preferable. Further, as a rubber to be impregnated or coated, NBR (nitrile butadiene rubber) or NR (natural rubber) is preferable. Further, latex (water-soluble emulsion) may be impregnated (immersion (dipping)). When the resin is coated (coated), PU (polyurethane) or PVC (polyvinyl chloride) can be used as the coating material.

  As a manufacturing method of the fiber substrate 13, the high strength fiber 11 is impregnated (or coated) with the rubber 12 (or resin), then cut into a strip shape, and the ends are joined to form a ring. In this joining step, an adhesive may be used, or mechanical joining may be performed by sewing or the like. Further, depending on the material to be impregnated, the ends can be welded together.

  Further, when an unfoamed material is used as the buffer material 14, it is preferable to use rubber baked (vulcanized molded) rubber or extruded molded elastomer, and rubber having a low expansion ratio (2 to 10 times). Sponge or urethane foam may be used. It is also possible to cast by casting into an annular mold using two-component urethane or the like. In the case of using a foam material, the rubber-baked (vulcanized molded) foamed rubber may be cut into an annular shape or extruded. The cushioning material 14 is softer than the fiber base 13 and is made of a material equivalent to or softer than the tube 4 and preferably has a Shore A hardness of 10 to 60.

  And the adhesive 5 is apply | coated to the single side | surface of the fiber base | substrate 13, and the member 5 for puncture prevention is formed by affixing on the buffer material 14 (for example, the rubber sheet which carried out the vulcanization molding). At this time, an annular material may be used as the buffer material 14 or a belt-shaped material may be used. Further, the surface of the fiber base 13 is formed by topping the unvulcanized rubber as the buffer material 14 onto the fiber base 13 and forming it into a semicircular shape by rubber internal pressure molding so that it can be easily along the inner peripheral surface of the tire 3. Alternatively, a cushioning material 14 such as a rubber layer may be produced.

  In this embodiment, as shown in FIG. 2 (c), the puncture preventing member 5 is in a natural standing state in which no external force is received (a state in which no force is applied from the tube 4 (including a puncture state)). ) Of the cross section is formed into a substantially trapezoidal shape. That is, the inner peripheral plane part 5b of the puncture preventing member 5 is wider than the outer peripheral plane part 5a and the rim 2, and the inner peripheral plane part 5b and the outer peripheral plane part 5a are located on both sides from both ends of the outer peripheral plane part 5a. It is the shape connected through the inclined surface part 5c which inclines and spreads. And the exposed surface part of the outer peripheral plane part 5a and the inclined surface part 5c is comprised by the fiber base | substrate 13. FIG.

  With the above-described configuration, the fiber base 13 in which the fiber 11 is impregnated or coated with resin or rubber 12 is used as the puncture-preventing member 5, and the fiber base 13 is moved outwardly in the tire radial direction on the inner peripheral surface of the tire 3. Since it is arranged on the outer peripheral surface side of the puncture preventing member 5 facing the portion, the fibers are not misaligned, and it is possible to prevent the stab from penetrating due to this misalignment. That is, the relative positions of the fibers 11 are fixed by the resin or rubber 12 (that is, the resin or rubber 12 functions as a fixing material that fixes the relative positions of the adjacent fibers 11). As long as the gap between them does not spread and the stabbed object S does not break (cut) the fiber 11 itself, it is possible to prevent the stabbed object S from penetrating the fiber substrate 13 due to misalignment. Further, since the puncture preventing member 5 is a separate body (separable) from the tire 3, as shown in FIG. 4, even when the stabbed object S penetrates the tire 3 and enters the inside, the fiber substrate 13 only needs to be separated from the radially outward portion 3b of the tire 3 on the inner peripheral surface of the tire 3 and deformed to the tube 4 side, so that the stabbed object S can be prevented from reaching the tube 4, and the puncture by the stabbed object S Can be satisfactorily prevented. In addition, by using the high strength / high elastic modulus fiber (high strength fiber) 11 as the fiber of the fiber base 13, it is more sure that the stabbed object S cuts or penetrates the fiber itself and penetrates. Can be prevented.

  Further, even when the bicycle tire 3 rides on a stepped portion or the like formed on the ground contact surface, the fibers 11 are misaligned by the resin or rubber 12 that functions as a fixing material between the fibers 11, so Since the gap is prevented from spreading, it is possible to reduce the intrusion of the corner portion of the stepped portion between the fibers 11 by breaking the tire 3 and entering. In addition, since the cushioning material 14 is disposed on the inner peripheral side of the fiber base 13, the action of the tube 4 being strongly sandwiched between the tire 3 and the fiber base 13 and the rim 2 and being compressed is alleviated. As a result, the occurrence of riding punctures (so-called rim strike punctures) can be minimized.

  Furthermore, since the tube 4 is disposed in contact with the buffer material 14 instead of the fiber base 13, the tube 4 and the buffer material 14 are made to be softer than the tube 4 as the buffer material 14. Even when rubbed, the tube 4 is less likely to be damaged even if the cushioning material 14 is worn away. As a result, puncture of the tube 4 due to internal friction can be reduced.

  Also, even if the tube 4 is perforated for some reason and the air escapes and punctures, the tube 4 is placed on the cushioning material 14 of the puncture-preventing member 5 as shown in FIG. Since the punctured tube 4 can be received from below by the cushioning material 14 of the puncture-preventing member 5, vibrations and impacts from the grounding surface are alleviated by the cushioning material 14 and are not easily transmitted to the tube 4, temporarily. It is possible to run a bicycle.

  Further, in the above embodiment, even if air is evacuated from the tube 4, as shown in FIG. 5, the outer periphery of the puncture-preventing member 5 in the tire 3 is located near the portion of the grounding surface 8. Since the portion corresponding to the flat portion 5a has a substantially planar shape, there is an advantage that the ground can be stably grounded in a relatively wide area, and the vehicle can travel stably even when traveling temporarily in a punctured state.

  Further, in the present invention, in particular, since the cushioning material 14 is disposed on the inner peripheral side of the fiber base 13, the fiber base 13 is on the inner peripheral side in a state of being a single product before the puncture preventing member 5 is assembled to the tire 3. Therefore, the puncture-preventing member 5 can be held in a good shape such as an annular shape, and the fiber base 13 can be held without wrinkles. Therefore, even when the puncture-preventing member 5 is mounted on the inner peripheral side of the tire 3 at the time of bicycle assembly (including assembly at the time of tire replacement), this mounting operation can be performed easily and efficiently. . Moreover, since it can be mounted on the inner peripheral side of the tire 3 in a good state without wrinkles, internal friction caused by wrinkles is not generated and punctures are not generated, and good reliability can be maintained.

  In the above embodiment, the case where the cross-sectional shape of the puncture-preventing member 5 is formed to have a substantially trapezoidal shape has been described. However, the present invention is not limited to this, and FIGS. ), The fiber base 13 and the cushioning material 14 are both in a flat plate shape, the fiber base 13 is in a flat plate shape, and the cushioning material 14 has a shape having an inclined surface 14a such that both ends are thin. Or you may.

  Furthermore, in the above embodiment, the case where the fiber base 13 and the buffer material 14 have the same width is described. However, the present invention is not limited to this, and the buffer material 14 is made of the fiber base 13 as shown in FIG. The width of the cushioning material 14 may be wider than the both ends of the fiber base 13 and may be formed in a shape extending in the width direction. It is more preferable that each end in the width direction of the cushioning material 14 is 2 mm or more larger than each end in the fiber base 13 in the width direction dimension A.

  With this configuration, when the puncture-preventing member 5 is mounted, the side surfaces of both ends of the fiber base 13 made of a relatively hard material are disposed so as to be covered with the soft and wide cushioning material 14 and are relatively hard. The side surfaces of both ends of the fiber base 13 can be reliably prevented from coming into contact with the tube 4. As a result, the tube 4 can be more reliably prevented from being punctured by internal friction, and the reliability can be further improved.

  In any case, the thickness of the cushioning material 14 is preferably 0.3 to 10 mm, and when the thickness 5 is 0.3 mm or more, when the puncture-preventing member 5 is formed, the overall shape thereof is It is well maintained and easy to wear. Moreover, the fall of the elastic performance by the tube 4 can be suppressed because the thickness of the buffer material 14 shall be 10 mm or less.

  In the above embodiment, the case where the wheel assembly to which the puncture preventing member is mounted is for a bicycle as an example of a motorcycle, but is not limited thereto, and is for a motorcycle such as a motorcycle or a motorcycle. Is also applicable.

Sectional drawing (cross section including a tire shaft) of the wheel assembly which concerns on embodiment of this invention (A) is the whole side view of the member for puncture prevention which concerns on embodiment of this invention, (b) and (c) is sectional drawing (cross section containing a tire shaft) and enlarged sectional view of the member for puncture prevention (A)-(e) is the top view of the fiber base | substrate of the member for puncture prevention, a cross-sectional view, an enlarged plan view, an enlarged cross-sectional view, and the whole side view Sectional drawing which shows the state which the stab thing stabbed in the wheel assembly which concerns on embodiment of this invention. Cross-sectional view of the wheel assembly in a punctured state (A) And (b) is sectional drawing of the modification of the member for the same puncture, respectively Sectional drawing of the other modification of the member for the said puncture prevention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Wheel assembly 2 Rim 3 Tire 4 Tube 5 Puncture prevention member 11 Fiber (high-strength fiber)
12 Rubber (fixing material)
13 Fiber substrate 14 Buffer material S Stinging material

Claims (5)

A tire puncture prevention member disposed in an annular shape between a radially outer portion of the tire for a motorcycle and an outer peripheral surface of the tube,
The fiber substrate is formed by impregnating or coating the fiber with resin or rubber,
A member for preventing puncture of a tire, wherein a cushioning material is disposed on an inner peripheral side of the fiber base.   2. The tire puncture prevention member according to claim 1, wherein the fibers are of high strength and high elastic modulus.   The member for preventing puncture of a tire according to claim 1 or 2, wherein the cushioning material is softer than the fiber base and is equivalent to or softer than the tube.   The cushioning material is wider than the fiber base and has a shape in which both ends of the cushioning material extend in the width direction rather than both ends of the fiber base. Tire puncture prevention member.   A wheel assembly, wherein the puncture-preventing member according to any one of claims 1 to 4 is disposed between an inner peripheral surface of a motorcycle tire and an outer peripheral surface of a tube.

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