JPH1159119A - Assembly of tire and rim for two-wheeled vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable traveling for a while in a state where a tire is punctured and without deteriorating assemblage of a tire rim, by making a tube into a bellows shape in which the diameter is varied by being repeatedly increased and decreased in the circumferential direction. SOLUTION: A tube 5 for supporting load from a tire by being expanded by pressurization is arranged on the inner surface of a tire. The tube 5 is formed into a bellows shape in which the tube diameter is varied by being repeatedly increased and decreased in the circumferential direction like D1, D2, and it is desirable that the thickness of the tube is in the range of 5 to 10 mm. The tube 5 is formed into a bellows shape in the puncture state in which air is discharged from the inside of the tube 5. In this tube 5, since resistance in relation to longitudinal flexure is increased in comparison with a conventional cylindrical tube even if inside air is discharged by the synergistic effect obtained by specifying the bellows shape and the tube thickness, the continuous travel distance in the puncture state can be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an assembly of a tire and a rim for a two-wheeled vehicle capable of increasing a continuous running distance during a puncture.

[0002]

2. Description of the Related Art In motorcycles, tube-type tires are generally used. However, in the event of a puncture in which air has escaped from a tube, the amount of vertical deflection of the tire becomes extremely large. The sliding friction between the tire and the tire causes thermal damage to the tube.
Also, unlike motorcycles, motorcycles do not carry spare tires at all times.Therefore, when puncturing, there is a problem that the vehicle must be moved to the repair ground by pushing the vehicle by humans. The emergence of tires that are difficult to perform or that can be run for a while in the same state even when punctured is expected.

[0003] Conventionally, as an improvement in puncture resistance of motorcycle tires, a tire cavity surrounded by a tire and a rim is provided as follows.
A technique of disposing a tube and a sponge-like buffer having closed cells disposed so as to cover the tube is disclosed in, for example, JP-A-3-231008 and JP-A-3-292.
No. 206 and Japanese Patent Application Laid-Open No. 8-164719.

[0004]

However, all of the above-mentioned prior arts have a disadvantage that the cushioning member hinders the incorporation of the tire into the rim. Also,
In recent years, there has been proposed a technique of disposing only the buffer without disposing the tube in the tire lumen to completely eliminate the destruction of the tube. Since a large amount of heat is generated and the heat is difficult to be radiated to the outside, there is a problem that the structure is likely to be destroyed by the heat during normal running, and there is a problem of lack of practicality.

The present invention has been devised in view of the above problems, and is based on the fact that a tube arranged in a tire lumen surrounded by a tire and a rim is formed in a bellows shape. Provides a two-wheeler tire and rim assembly that can run for a while in the same condition without sacrificing the assemblability and because the bellows-like shape of the tube resists vertical bending even when punctured. It is intended to be.

[0006]

According to the first aspect of the present invention,
A tire and rim assembly for a two-wheeled vehicle, wherein a tube that expands by pressurization and supports a load from the tire is disposed in a tire lumen surface surrounded by a tire and a rim for assembling the tire, The tube has a bellows shape in which the thickness d of the tube is 5 to 10 mm in a meridional section including the rotation axis and the tube diameter repeatedly changes in the circumferential direction, and the outer peripheral surface of the tube is in the tire due to the expansion. It is characterized by being in contact with the cavity surface.

According to a second aspect of the present invention, the tire and rim assembly for a motorcycle according to the first aspect of the present invention is characterized in that the tube has a thickness d which repeatedly increases and decreases in a circumferential direction. It is.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the tire / rim assembly 1 of the present invention expands by pressurization into the tire cavity surface 4 surrounded by the tire 2 and the rim 3 for assembling the tire 2 from the tire 2. The tube 5 which supports the load of the above is arranged. The right half of FIG. 1 shows a meridional cross section in a state where the tube 5 is filled with the working internal pressure and is expanded, and the left half of FIG. 1 shows a state before filling of the tube 5 with the working internal pressure, that is, a state almost at the time of puncturing. , All are in a no-load state.

The tire 2 has a tread portion 6 having a tread groove T formed on an outer peripheral surface thereof, sidewall portions 7 extending from both ends inward in the tire radial direction, and A carcass 11 having a hollow toroidal shape having a bead portion 10 located on the radially inner side, being folded from the tread portion 6 through the sidewall portion 7 at the bead core 9 of the bead portion 10, and having cords arranged in parallel. Has been reinforced. The carcass 11 is preferably a carcass ply in which organic fiber cords are arranged in parallel.

The rim 3 is formed in a ring shape by connecting a pair of rim seat portions 11 on which bead bottom surfaces 10A formed at radially inner ends of the bead portions 10 and 10 are respectively seated. Thus, the tire bore surface 4 is formed.

In the present invention, the tube 5 has a bellows shape in which the tube diameter changes alternately and repeatedly in the circumferential direction as shown in FIG. 2 as indicated by D1 and D2. For example, the tube diameter D1 of the large diameter portion 5a of the tube 5 and the tube diameter D2 of the small diameter portion 5b
The ratio (D1 / D2) is preferably 1.04 to 1.15, more preferably 1.08.

The tube 5 has a thickness d of 5 to 5 in a meridional section (shown in FIG. 1) including the rotation axis.
Preferably, it is 10 mm. When the thickness d of the tube is less than 5 mm, the resistance to the longitudinal deflection of the cross section of the tube 5 is small, and it is impossible to increase the continuous running distance during puncture. Conversely, when the thickness exceeds 10 mm, the tube 5 expands. Is unfavorable, for example, and the ride comfort deteriorates and the tire weight increases. The thickness d of the tube is measured before filling the internal pressure.

[0013] The bellows-shaped tube 5 is arranged in the inner surface of the tire and is inflated by filling with air from a tire valve (not shown). In the present embodiment, the large-diameter portion 5a on the outer peripheral surface of the tube is first formed. By contacting the tire cavity surface 4 and further filling the tube 5 with air, the elongation of the small-diameter portion 5b is increased, and the small-diameter portion 5b also expands so as to be in contact with the tire cavity surface. . This allows
The tube 5 deforms the shape of the tire 2 to a predetermined design size (the right half in FIG. 1), and the tube outer peripheral surface 5
s is deformed so as to substantially match the shape of the tire lumen surface 4. And such a tube 5
Can support the load from the tire 2 together with the internal air by expanding.

On the other hand, in a punctured state in which air is released from the inside of the tube 5, the tube 5 is restored to the bellows shape shown in FIG. Such a tube 5 has a greater resistance to longitudinal bending than a conventional cylindrical tube, even when the internal air is released by the synergistic action of the bellows shape and the definition of the tube thickness d, It is possible to increase the continuous running distance in the state where the tire is punctured as compared with the conventional tire.

Further, if the vehicle continues to travel as it is at the time of puncturing, friction occurs due to contact and slip between the outer peripheral surface 5s of the tube 5 and the inner surface 4 of the tire, and the heat generated by the tube 5 increases. However, in the assembly 1 of the present invention,
At the time of puncturing, since the tube 5 becomes bellows-like, the contact area with the tire lumen surface 4 is reduced, and the slip between the two is relatively alleviated as compared with the related art, so that the heat generation of the tube 5 and the like is reduced. And durability during puncture can be greatly improved.

The outer peripheral surface 5s of the tube is the inner surface 4 of the tire.
In addition to the case as in the above embodiment, the case where only the large diameter portion 5a of the tube 5 contacts the tire lumen surface 4 and the case where the small diameter portion 5b does not contact the tire lumen surface is included.

In the present embodiment, the tube 5 has a substantially uniform thickness d in the circumferential direction as shown in the cross-sectional portion of FIG. 2, but for example, as shown in FIG. The thickness d may be changed by repeatedly increasing and decreasing the thickness d. In this example, the thickness d of the tube is increased at the large diameter portion where the tube diameter is D1 and small at the small diameter portion where the tube diameter is D2, so that the elongation of the small diameter portion in the tire lumen is reduced. It is preferable because it is easy.

The "bellows" of the tube 5 include not only those having a wavy contour on the outer surface of the tube as in this embodiment, but also those having a zigzag sawtooth shape shown in FIG. 4 and a rectangular wave shape shown in FIG. Any shape may be used as long as the tube diameter changes alternately and repeatedly in the circumferential direction.

In the present embodiment, before filling the internal pressure, the tube 5 has a position where the tire cavity surface 4 intersects the tire equatorial plane as shown in the left half of FIG. Those in contact with the vicinity are preferred. This can effectively prevent rim displacement or the like at the time of puncturing. Further, the inner end 5i of the tube 5 is filled before the internal pressure is used.
Indicates that the rim is formed so as to be located radially outward of the bead base line BL in the present embodiment to improve the rim assembling performance.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Various bellows-like tubes of the present invention were manufactured on a trial basis and arranged on tires having a tire size of 2.75-14 and 14 × MT.
The rim was assembled on a rim of 1.85, and the motorcycle was mounted on a motorcycle in a punctured state in which the air valve of the tube was opened. In addition, the same test was performed on a tire having a conventional cylindrical tube, and the performance was compared. Table 1 shows the test results.

[0021]

[Table 1]

As a result of the test, it was confirmed that the assembly of the embodiment increased the running distance in the punctured state as compared with the conventional tire and rim assembly having a cylindrical tube. After filling and running
No difference was felt in running performance such as acceleration, deceleration, braking, turning and the like.

[0023]

As described above, the motorcycle tire and rim assembly of the present invention has a bellows shape and a tube thickness of 5 to 5 in a punctured state where air is released from the inside of the tube. By limiting it to 10 mm, even if the air inside is released, the resistance to vertical deflection increases compared to the conventional cylindrical tube, so the continuous mileage in the punctured state is increased compared to the conventional tire can do.

Further, in the assembly of the present invention, since the tube becomes bellows at the time of puncturing, the area of contact with the tire inner cavity surface is reduced in conjunction with the above-mentioned operation, and slippage between the two is reduced. As a result, heat generation of the tube and the like can be reduced, and structural destruction due to heat during puncturing can be effectively prevented, so that durability can be improved. Furthermore, since the cushioning member provided in the conventional tire is not required, it is possible to prevent a problem that the rim assembling property is impaired.

Further, the characteristics of the tube can be changed by repeatedly changing the thickness of the tube in the circumferential direction, for example, by varying the thickness of the tube in the circumferential direction. There is the advantage that it can be adjusted.

[Brief description of the drawings]

FIG. 1 is a meridional sectional view of an assembly showing one embodiment of the present invention.

FIG. 2 is a partial side view (partially sectional view) showing an example of a tube.

FIG. 3 is a partial cross-sectional view showing another example of a tube.

FIG. 4 is a partial side view (partial cross section) showing another example of a tube.
FIG.

FIG. 5 is a partial side view (partial cross section) showing another example of a tube.
FIG.

[Explanation of symbols]

 2 tire 3 rim 4 tire bore 5 tube

Claims (2)

[Claims] An assembly of a tire and a rim for a two-wheeled vehicle, wherein a tube which expands by pressurization and supports a load from the tire is disposed in a tire cavity surrounded by the tire and a rim for assembling the tire. In the tube, in a meridional section including a rotation axis, the thickness d of the tube is 5 to 10 mm, and the tube diameter has a bellows shape that repeatedly changes in the circumferential direction and changes,
A tire and rim assembly for a motorcycle, wherein the outer circumferential surface of the tube comes into contact with the inner surface of the tire due to the expansion. 2. The motorcycle tire and rim assembly according to claim 1, wherein said tube has a thickness d which repeatedly increases and decreases in a circumferential direction.