JP2002264601A - Sealing structure of rim for tubeless tire - Google Patents

Abstract

(57) [Problem] To provide a highly durable sealing structure capable of suitably preventing air leakage of a tubeless tire. SOLUTION: The head of a nipple 6 inserted into a nipple hole 5 of a rim 1 is covered with a rim band 7 made of a soft resin not containing sulfur, and a silicone material 8 is provided thereon as a sealing material.
Fill. As the soft resin material, a vinyl chloride resin is preferable. Since this soft vinyl chloride resin does not contain any sulfur, the silicone of the sealing material does not cause a curing failure during the vulcanization, the plastic flow is reduced, and the silicone material 8 is excellent in elasticity and tensile strength. Can be. Further, since the silicone material 8 and the vinyl chloride resin as the rim band material are excellent in mutual adhesion, good sealing properties can be obtained over a long period of time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tubeless tire rim sealing structure supported by spokes.

[0002]

2. Description of the Related Art In a wheel with a spoke used for a motorcycle, a bicycle, or the like, a nipple for screwing into the spoke is provided in a rim well of a rim in order to fix the spoke from the inside.

However, when a tubeless tire is used, air leaks from the gap between the nipple and the fitting hole, so that the rim well portion is usually provided in, for example, Japanese Patent Application Laid-Open No. As disclosed in Japanese Patent Application Laid-Open No. 61-71501, an annular rim band is provided so as to cover the head of a nipple inserted into a nipple hole, and a sealing structure is provided in which an upper side thereof is sealed with a sealing material. Have been.

[0004] Conventionally, silicone rubber or the like, which is excellent in terms of sealing properties (airtightness), heat resistance and weather resistance, has been mainly used as the sealing material. As the rim band, a metal sheet such as aluminum has been used, but since it is expensive, a rubber material (mainly natural rubber, butyl rubber, or the like) which is inexpensive and has excellent elasticity and adhesion is used at present. Have been.

[0005]

As described above, the rim band has an annular shape and is usually manufactured by extrusion. The extruded material of rubber is always kneaded with a plasticizer in the molding process, but this plasticizer contains sulfur, which reacts with the silicone filled with this sulfur and causes curing failure, Plastic flow of silicone rubber during the curing reaction (vulcanization),
Alternatively, it may cause adverse effects such as insufficient elasticity and tensile strength. This causes a problem that the sealing property of the sealing structure is deteriorated. In addition, a rim band made of natural rubber or butyl rubber and a seal material made of silicone rubber are not very compatible with each other in terms of adhesiveness, and thus have a disadvantage that they are easily peeled off during use.

[0006] The present invention solves the above-mentioned conventional problems,
An object of the present invention is to provide a highly durable tubeless tire rim sealing structure capable of suitably preventing air leakage of a tubeless tire.

[0007]

That is, according to the present invention, there is provided a silicone resin having an annular rim band disposed so as to cover a head of a nipple inserted into a nipple hole of a rim. In a sealing structure for a tubeless tire rim sealed with a material, the rim band is made of a soft resin material containing no sulfur.

Further, the present invention according to claim 2 is characterized in that a flexible resin material is used as the resin material.

Further, the present invention according to claim 3 is characterized in that a vinyl chloride resin is used as the resin material.

[0010] The present invention according to claim 4 is characterized in that the rim band is arranged so as to form a space around the nipple head.

The present invention according to claim 5 is characterized in that both end portions of the rim band are located on the inner wall of the rim well portion.

[0012] According to the first to third aspects of the present invention, since the rim band material does not contain sulfur,
It is possible to prevent curing failure during the curing reaction (vulcanization) of the silicone, which is likely to occur due to the reaction with sulfur, and to suitably cure the filled silicone, so that good sealing properties can be maintained over a long period of time. it can. According to the invention described in claim 4, by providing a space around the nipple head,
The filling amount of the silicone material can be reduced, and the spokes can be easily tightened or replaced. Furthermore, according to the fifth aspect of the present invention, the bead portion of the tire and the side end portion of the rim band are separated from each other and do not contact with the bead portion, so that wear and damage of the rim band can be prevented.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.

FIG. 1 is a sectional view of a main part showing an internal structure of a rim 1 for a tubeless tire according to the present invention. As shown in FIG. 1, the rim 1 includes a pair of left and right flange portions 2 and 2,
An annular body comprising a pair of left and right bead seats 3 connected to the bases of the flanges 2 and 2 and a bowl-shaped rim well 4 located between the beat seats 3 and 3 is formed. 3 is a structure in which the bead portion T1 of the tubeless tire T is mounted so as to abut. Usually, the rim 1 is made of aluminum alloy or steel.

The body of the nipple 6 is inserted into a nipple hole 5 provided at the center of the bottom of the rim well 4, and the nipple 6 and a spoke 9 extending radially from a hub at the center of a wheel (not shown) are screwed and connected. Thus, the rim 1 is supported. In the present invention, an annular rim band 7 is interposed so as to cover the head of the nipple 6 inserted into the nipple hole 5, and the entire surface of the rim well portion is filled with liquid silicone from above, and the rubber is cured by a vulcanization reaction. (Silicone sealant 8), and has a sealing structure for preventing air leakage from the nipple hole 5.

In this embodiment, in this sealing structure,
A soft vinyl chloride resin is used as a material of the rim band 7 covering the head of the nipple 6. Unlike conventional butyl rubber (synthetic rubber), this soft vinyl chloride resin does not contain any sulfur, so that the silicone of the sealing material does not cause curing failure during vulcanization and reduces plastic flow. Silicone material 8 having excellent elasticity and tensile strength can be obtained. Further, the silicone material 8 and the vinyl chloride resin as the rim band material have good compatibility in mutual adhesion.

Also, since the vinyl chloride resin has about 30% lower air permeability than the conventional butyl rubber, the entire surface inside the rim well is not sealed with the silicone material 8 as in the embodiment of FIG. Rim band 7 as shown in 2
A good sealing effect can be obtained by sealing only both sides of the rim well 4 where the side end portions of the rim well 4 are in contact. Thereby, the force applied to the silicone material 8 can be reduced when the tubeless tire T falls from the bead seat portion 3 to the rim well portion 4 due to a puncture or the like (the tire falls),
It is possible to prevent the silicone material 8 from being deformed or broken by the impact at that time.

Further, in the present embodiment, when the rim band 7 is provided, a space is provided around the nipple 6 head. Thereby, the filling amount of the silicone material 8 can be saved, the inconvenience that the nipple hole 5 is clogged by the silicone material 8 can be prevented, and the tightening and replacement of the spokes 9 can be easily performed.

Further, in the present embodiment, the structure is such that the side end of the rim band 7 disposed in the rim well 4 is located on the inner surface of the rim well 4 which is separated from the bead seat 3. In the structure in which both end portions of the rim band 7 are extended to the bead seat portion 3 and are sandwiched and fixed by the tire bead portion T1, a portion where the rim band 7 comes into contact with the tire bead portion T1 is worn due to an impact during traveling or tire replacement. Although the problem of tearing or tearing occurs, such a problem is solved in the above structure, and the sealing structure can always maintain good sealing performance.

As described above, in the rim according to the present embodiment,
Although it is suitable for a tubeless tire in which the sealing property of the nipple hole portion is a problem, it is of course possible to mount a tire with a tube. This configuration is applicable to all spoked wheels used for motorcycles, bicycles, and the like.

As the material of the rim band 7, a hard resin material containing no sulfur may be used, and a material obtained by forming the material into an annular shape may be mounted on the rim well portion 4.
Further, it is of course possible to use not only the above-mentioned vinyl chloride resin but also other soft resins containing no sulfur.

[0022]

As described above, according to the first and second aspects of the present invention, the use of the rim band material containing no sulfur causes the silicone material to be hardened by the sulfur content during assembly. And vulcanization can be suitably performed. Thereby, good sealing properties can be obtained over a long period of time.

According to the third aspect of the present invention, the vinyl chloride resin of the rim band material has good sealing properties because it has excellent adhesion to silicone rubber as a sealing material in addition to the above-mentioned effects. be able to.

According to the fourth aspect of the present invention, by providing a space around the nipple head, the filling amount of the silicone material can be reduced, which is very economical, and the nipple hole formed by the silicone material is extremely economical. The clogging can be prevented, and the spokes can be easily tightened and replaced.

Further, according to the fifth aspect of the present invention, by forming the structure in which both end portions of the rim band are located on the inner side surface of the rim well portion and separated from the bead seat portion, the tire bead portion can be separated from the bead seat portion. Abrasion and damage of the rim band 7 due to contact can be eliminated, and good sealing properties can always be maintained.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a rim showing an embodiment of the present invention.

FIG. 2 is a sectional view of a main part of a rim showing another embodiment different from FIG. 1;

[Explanation of symbols]

 Reference Signs List 1 rim 3 bead seat 4 rim well 5 nipple hole 6 nipple 7 rim band 8 silicone material (silicone rubber) T tubeless tire

Claims (5)

[Claims] 1. A tubeless tire rim sealing structure sealed with a silicone material via an annular rim band disposed so as to cover the head of a nipple inserted into a nipple hole of the rim, A rim sealing structure for a tubeless tire, wherein the rim band is made of a resin material containing no sulfur. 2. The sealing structure for a rim for a tubeless tire according to claim 1, wherein a flexible resin material is used as the resin material. 3. The sealing structure for a tubeless tire rim according to claim 1, wherein a vinyl chloride resin is used as the resin material. 4. The seal for a tubeless tire rim according to claim 1, wherein the rim band is disposed so as to form a space around the nipple head. Stop structure. 5. The sealing structure for a rim for a tubeless tire according to claim 1, wherein both end portions of the rim band are located on inner walls of the rim well portion.