JPS6027041Y2 - Device to prevent beads from falling off of tubeless tires - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a device for preventing the bead portion of a tubeless tire from falling off, and in particular, it reduces the number of component parts to improve ease of installation and removal, and also improves airtightness.

Generally, in tubeless tires installed on the wheels of high-speed vehicles such as racing cars, there is a risk that the bead of the tire may fall off from the wheel due to air leakage due to punctures, etc., and this is to prevent the deterioration of the running posture holding performance due to this. In addition, a device to prevent the bead from falling off is attached to the bead seat of the wheel.

Conventional devices of this type include, for example, a bolt with a stopper fixed to one end inserted into a rim hole from the inside of the wheel with a gasket interposed, and the bolt fixed to the wheel with a tightening nut, and A rubber body with a protrusion larger than the hole, an air leak prevention surface, and a ring-shaped groove at the rear that fits into the rim hole is vulcanized and bonded to the tip of the shaft, which has a threaded portion only on the outer periphery of the rear. Also known are devices in which a stopper having a threaded hole is screwed into a rim hole and fixed, a sealing material is interposed on the end face of the stopper, and a stopper bolt is screwed into the threaded hole.

However, among these devices, the first one has a large number of component parts, the second one has a complicated structure and is expensive to manufacture, and both devices require a spanner to attach and detach from the wheel. Since it is necessary to use work tools such as a wrench and a wrench, there is a disadvantage in terms of workability that it is complicated and time-consuming.Furthermore, the first and second methods have a disadvantage in maintaining airtightness between the device and the rim. Although there is no particular problem because rubber is used as the sealing material, the third one has a structure that uses a synthetic resin sealing material, so there is a drawback that the airtightness deteriorates early.

This invention was made in order to eliminate the above-mentioned drawbacks, and the purpose of this invention is to provide a bead drop-off prevention device that has few components and can be attached and detached with simple operations. The purpose of the invention is to provide a bead part fall-off prevention device that has a high airtightness maintaining function.

That is, this invention, as in the illustrated embodiment, has a hollow stem that is screwed into a plurality of screw holes 22 formed in a bead seat portion 21 of a vehicle wheel 20 by applying adhesive 4 to its outer periphery. 1, a tightening nut 5 screwed onto the outer periphery of the stem 1 from the outside of the wheel 20, and a hollow hole of the stem 1 in the head of a cap nut 13 that can be screwed onto the outer periphery of the stem 1. The end of a rod 11 having a diameter smaller than 2 and a length larger than the entire length of the stem 1 is fixed to the stopper 10 and a seal body 12 is fitted into the inner bottom surface of the head. The rod 11 is pushed into the hollow hole 2 of the stem 1 so that it protrudes beyond the inner surface of the bead seat portion 21, and the sealing body 1 of the cap nut 13 is closed.
2 is screwed into contact with the end surface of the stem 1.

Examples of this invention will be described below with reference to the drawings.

FIG. 1 shows the constituent parts of the device for preventing the bead portion from falling off according to the present invention, in which the figure a shows the stem, the figure shows the stem tightening nut, and the figure C shows the stopper.

The stem 1 is a cylindrical body in which a hollow hole 2 is formed in the length direction, and a screw 3 is threaded around the outer periphery of the stem 1.

The tightening nut 5 is one that can be screwed onto the screw 3 of the stem 1.

The stopper 10 is cut out from a rod 11 and a cap nut 13 into which a seal body 12 is fitted. It is a cylindrical body that is sufficiently longer than .

As the material of the rod 11, mechanical structural carbon steel, alloy steel, or the like is used.

The cap nut 13 is one that can be screwed onto the screw 3 of the stem 1. A hole 14 is bored through the center of the head of the cap nut 13, and the end of the rod 11 is inserted into the hole 14.
1 and a cap nut 13 are brazed 15 and fixed together.

The seal body 12 is fitted between the rod 11 and the cap nut 13 and is in contact with the inner bottom surface of the head of the cap nut 13.

FIG. 2 shows a state in which each of the above-mentioned components is mounted on a wheel.

In the figure, reference numeral 21 indicates a bead seat portion of the wheel 20, and 23 indicates a well portion, and a bead portion 31 of a tubeless tire 30 is incorporated into the bead seat portion 21.

The bead seat portion 21 is provided with a plurality of screw holes 22, and the stem 1 is screwed into the screw holes 22. A tightening nut 5 is inserted from the outside of the bead seat portion 21 onto the screw 3 on the outer periphery of the stem 1. It is screwed on.

Further, a rod 11 of a stopper 10 is inserted into the hollow hole 2 of the stem 1 so that its tip protrudes beyond the inner surface of the bead seat portion 21, and a cap nut 13 is screwed onto the end of the stem 1. .

Reference numeral 4 indicates an adhesive that fills the gap between the stem 1 and the screw hole 22.

Although FIG. 2 shows a wheel without a hump (protrusion) on the bead seat, in a wheel with a hump on the bead seat, the screw hole 22 is provided closer to the center of the wheel than the hump.

When the bead drop-off prevention device of this invention is placed on a wheel, the attachment of each component and the rim assembly of a tubeless tire are performed in the order shown in FIG.

The stem 1 and tightening nut 5 are the tubeless tire 3.
Attach it to the wheel before assembling the 0.

The stem 1 is screwed into the screw hole 22 of the bead seat part 21 with a suitable adhesive 4 attached to its outer periphery, and then a tightening nut 5 is screwed from the outer periphery of the bead seat part 21 to the outer periphery of the stem 1. and fix the stem 1 to the bead seat part 21.

Adhesive is also applied between the tightening nut 5 and the stem 1.

In this way, the stem 1 is prevented from loosening, and
The gap between the screw hole 22 and the stem 1 is filled to make it airtight.

Next, a valve cap 40 shown in FIG. 4 is screwed onto the end of the stem 1, and the tubeless tire 30 is assembled to the bead seat portion 21.

This valve cap 40 has the same structure as the cap nut 13 of the stopper 10, but has no hole in the head and a seal 41 fitted in the inner bottom surface.

In this state, air is injected from an air filling valve of the wheel (not shown) to press the bead portion 31 of the tubeless tire 30 onto the bead seat portion 21.

Next, after unscrewing the valve cap 40 from the stem 1, the rod 11 of the stopper 10 is pushed into the hollow hole 2 of the stem 1 so that the tip of the rod 11 protrudes beyond the inner surface of the bead seat portion 21, and the cap nut 13 is screwed off. When the cap nut 13 is screwed onto the stem 1, the seal body 12 fitted into the cap nut 13 comes into contact with the end surface of the stem 1, resulting in the state shown in FIG. 2.

In this way, air is injected into the wheel on which the bead drop-off prevention device and the tubeless tire are mounted, and the air pressure is set to a predetermined level.

As mentioned above, since the rod 11 of the stopper 10 protrudes from the inner surface of the bead seat portion 21 of the wheel, even if air leakage occurs due to a puncture, the rod 11 This prevents it from falling from the part 21 to the well part 23.

The gap between the screw hole 22 of the bead seat part 21 and the stem 1 is filled with the adhesive 4, so there is no air leakage from this area.
Since the seal body 12 of the cap nut 13 of the stopper 10 is in contact with the stopper 10, air will not leak from the gap between the hollow hole 2 of the stem 1 and the rod 11 of the stopper 10.

The bead drop-off prevention device of this invention can be installed at at least three locations in the circumferential direction of the bead seat on the outside of the wheel, which can sufficiently prevent the bead from falling off. It can also be attached to the bead seat inside the wheel.

As explained above, the bead drop-off prevention device of this invention is composed of three parts: a stem, a stem tightening nut, and a stopper. Since it can be simply and easily manufactured as is or with some modification, manufacturing costs are significantly reduced.

In addition, with this invention, if the stem is fixed to the bead seat of the wheel with a tightening nut, the stopper's cap nut can be inserted from the outside of the wheel and turned by hand, making it easier to attach and detach the stopper. It does not require working tools such as spanners or wrenches, and can be attached and detached with simple operations, so it has much better workability than conventional devices, and has the advantage of having a high airtightness function.

This invention can be widely applied not only to racing cars but also to general vehicle wheels equipped with tubeless tires.

[Brief explanation of the drawing]

Fig. 1 is a semi-longitudinal sectional view showing each embodiment of the component parts of this invention, Fig. 2 is a partial sectional view showing the state of this invention when the wheel is attached, and Fig. 3 is a partial sectional view showing the state when the tire rim is assembled. FIG. 4 is a partial cross-sectional view showing a state in which some of the component parts are attached, and FIG. 4 is a half-longitudinal cross-sectional view of the valve cap. In the figure, 1 is a stem, 2 is a hollow hole, 4 is an adhesive, 5 is a tightening nut, 10 is a stopper 11 is a rod, 12 is a seal body, 13 is a cap nut, 20 is a wheel, and 21 is a bead seat part , 22 are screw holes.

Claims (1)

[Scope of utility model registration request] A hollow stem that is screwed into a plurality of screw holes drilled in a bead seat portion of a vehicle wheel by applying adhesive to its outer periphery, and a tightening screw that is screwed onto the outer periphery of the stem from the outside of the wheel. The end of a rod having a diameter smaller than the hollow hole of the stem and a length larger than the entire length of the stem is fixed to the head of a cap nut that can be screwed onto the outer periphery of the stem. The rod of the stopper is inserted into the hollow hole of the stem so that it protrudes beyond the inner surface of the bead seat, and the sealing body of the cap nut is attached to the end face of the stem. A device for preventing the bead of a tubeless tire from falling off, characterized in that the device is screwed onto the bead of a tubeless tire.