JPH0425363Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a two-wheeled automobile tire assembly, and in particular, the two-wheeled automobile tire assembled on a spoke wheel is attached to the rim by a bead stopper that also has a sealing function. By fixing it to
This reduces the weight of the tire.

[Conventional technology]

Traditionally, among motorcycle tires, tubeless tires have been widely used for general on-road medium and large models, but tires for trail vehicles and off-road vehicles for both on- and off-road use have been designed to withstand shock when riding on uneven surfaces. Built into highly absorbent spoke wheels, tubed tires are used to prevent air leakage between the tire and rim.

The conventional structure of this type of two-wheel vehicle tire assembly will be explained with reference to FIGS. 6 and 7. The bead portion 3 of the tire 2 mounted on the rim 1 is located between the tube 4 and the rim 1. It is crimped by a pair of fitted bead stoppers 5. This bead stopper 5 is fixed to the rim 1 by tightening the stem 6 with a nut 7, and one piece is attached to the front wheel rim and two pieces are attached to the rear wheel rim. . In addition, code 8 is the rim band,
9 is a tube valve.

[Problem that the invention attempts to solve]

As mentioned above, conventional motorcycle tire assemblies that are assembled on spoke wheels are made up of a tube, one or two bead stops, and a rim band, which increases the weight of the tire. However, in off-road tires, especially motocross competition tires, reducing tire weight, that is, unsprung weight, has a significant impact on driving characteristics, so reducing the weight of tire assemblies has become an important issue.

The object of this invention is to solve the above-mentioned problems and provide an assembly of a two-wheel vehicle tire and a spoke wheel that significantly reduces the weight of the tire.

[Means for solving problems]

A tubeless tire for two-wheeled vehicles that is assembled on spoke wheels, and a bead stopper that is made of a flat tube-shaped rubber-like elastic body, has a reinforcing layer in the center of the outer ring, and has a valve stem attached to the inner ring. and a spoke wheel having a rim provided with a valve hole for inserting the valve stem of the bead stopper, and with the tire and the bead stopper assembled in the rim and the bead stopper filled with air, the outer ring of the bead stopper Both end portions of the bead stopper are bulged outward in the radial direction, and the inner ring portion of the bead stopper is crimped onto the surface of the drop center portion of the rim, and the both end portions of the bead stopper are crimped onto the inner surface of the bead portion of the tire.

[Effect]

When the bead stopper built into the rim is filled with air at a predetermined pressure, the central part of the outer ring of the bead stopper is restrained from expanding in the radial direction and toward both ends by the reinforcing layer, and the expansion in the circumferential direction and width is suppressed. Since the length dimension in the direction does not change, both ends of the bead stopper bulge outward in the radial direction from the outer edge of the reinforcing layer and adhere to the inner surface of the tire bead part with strong contact pressure, and the inner ring part of the bead stopper It expands inward in the radial direction and toward both end portions, and is fixed in a state in which it is tightly adhered to the surface of the drop center portion of the rim.

〔Example〕

FIGS. 1 and 2 show an embodiment of this invention, and show a completed tire assembly.

In the figure, reference numeral 10 indicates a tubeless tire for a two-wheeled vehicle, 12 indicates a spoke wheel rim, and 20 indicates a bead stopper of this invention. Reference numeral 14 is a rim valve for filling air into the tire 10, and 24 is a valve for filling air into the bead stopper 20.

The original shape of the bead stopper 20 is, as shown in FIG. It is arranged. This reinforcing layer 22 is made of chemical fiber or steel fiber. Further, a valve stem 26 is attached to the inner ring portion 23 of the bead stopper 20.

The external dimensions of the bead stopper 20 are as follows:
The outer diameter A of the rim 12 is approximately the same as the diameter C at the center of the flange portion 13 of the rim 12 (see FIG. 5), or
Alternatively, it is preferable that the diameter is approximately the same as the inner diameter of the tire bead portion 11.
This is effective for improving workability during assembly, reducing size and weight, as well as improving adhesion to the inner surface of the tire bead and sealing between the tire and the rim. Further, it is preferable that the width B of the bead stopper 20 is equal to or smaller than the width D of the drop center portion 16 of the rim.

The rim 12 is provided with a valve hole 17 for inserting the valve stem of the bead stopper 20 in addition to a valve hole (not shown) for filling air into the tire.

Next, the assembly order of the tire assembly having the above configuration will be explained.

Rim assembly of tire 10 and bead stopper 20
Installation is carried out in the same manner as before, but before assembling the rim of the tire 10, in order to prevent air leakage from the spoke holes of the rim 12, seal tape is wrapped or a sealing material is filled to temporarily seal the rim. I'll keep it. In addition, the bead stopper 20, as shown in FIG.
A rubber packing 27 is applied to a valve stem 26 inserted into a valve hole 17 of a rim 12 and temporarily tightened with a nut 28 to prevent air leakage from the valve hole 17 when filling the tire with air.

Next, the tire 10 is filled with air from the rim valve 14, and the bead portion 11 of the tire 10 is inserted into the rim 12.
2, and adjust the air pressure to a predetermined pressure.

Subsequently, the bead stopper 20 is filled with air from the air filling valve 24 to inflate the bead stopper 20. The internal pressure of the bead stopper 20 is adjusted to be higher than the internal pressure of the tire 10.

Through the above procedure, the tire assembly shown in FIG. 1 is obtained.

In the tire assembly having the above configuration, the bead portion 11 of the tire 10 is connected to the both end portions 2 of the bead stopper 20.
Since the bead portion 11 is pressed against the flange portion 13 of the rim 12 by the internal pressure of the rim 12, the bead portion 11 is prevented from falling off the rim seat 15 even when the tire is punctured, when driving at low pressure, or when driving at an incline during cornering. In addition, since the inner ring 23 of the bead stopper 20 presses against the drop center 16 of the rim 12, it also has the function of sealing the tire 10 from leaking to the outside. It will have both.

[Effect of idea]

As explained above, according to this invention, it is possible to use a tubeless tire by eliminating the tube that was conventionally unavoidable for tires assembled on spoke wheels, and the bead stopper is also made of flat tubes. Since it is made of a rubber-like elastic body, the weight of the tire can be significantly reduced. Therefore, it is possible to obtain a tire assembly having very effective running characteristics when applied to a two-wheel vehicle tire for both on-off and off-road use that is assembled on the rim of a spoke wheel.

Further, according to this invention, since the bead stopper has a flat tube shape, the workability of assembling the tire rim is improved.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing an embodiment of this invention, Figure 2 is a sectional view showing an embodiment of this invention.
The figure is a side view, Figure 3 is a sectional view showing the assembled state before air filling, Figure 4 is an enlarged sectional view showing the bead stopper of this invention, Figure 5 is a diagram of the shape of the rim, and Figure 6 is a conventional one. FIG. 7 is a cross-sectional view showing a tire assembly, and FIG. 7 is a side view thereof. In the figure, 10 is a tubeless tire, 11 is a bead part, 12 is a rim, 16 is a drop center part,
17 is the valve hole, 20 is the bead stopper, 21
22 is an outer ring part, 22 is a reinforcing layer, 23 is an inner ring part, 25 is both end parts, and 26 is a valve stem.

Claims (1)

[Scope of utility model registration request] A tubeless tire for two-wheeled vehicles that is assembled on spoke wheels, a bead stopper that is made of a flat tube-shaped rubber-like elastic body, a reinforcing layer is provided in the center of the outer ring, and a bulb stem is attached to the inner ring. , a spoke wheel in which a valve hole for inserting the valve stem of the bead stopper is provided in the rim, and when the tire and the bead stopper are assembled in the rim and the bead stopper is filled with air, the outer ring of the bead stopper is Both end portions bulge outward in the radial direction, and the inner ring portion of the bead stopper is crimped and fixed to the surface of the drop center portion of the rim, and the both end portions of the bead stopper are crimped and fixed to the inner surface of the bead portion of the tire. A two-wheel vehicle tire assembly characterized by: