JPH0284320A - Method for filling tubeless tire with foaming material and foamed filling body - Google Patents

Abstract

PURPOSE:To simply use a commercial tire and a wheel rim without using a special device by filling the housing of a tubeless tire with an elastomer foaming material. CONSTITUTION:A divided foaming material 6' is compressed by a mechanical means to be externally covered with a plastic film pack 8 and held to a compressed state to obtain a foamed filling body 7'. The bead 3 on the single side of a tire 1 is detached from a rim 2 and the space between the bead 3 and the rim 2 is forcibly opened by a jig to form a gap 10 and the foamed filling body 7' is inserted in the housing 4 of the tire from the gap 10. An inert lubricant is injected and sprayed to the surface of the film pack of the filling body 7' or the inner surface of the housing 4 of the tire by a spray means and a knife is inserted in the gap 10 to cut in a part of the pack 8. Air enters the pack 8 to release the vacuum state of the pack 8 and the divided foaming material 6' is expanded to fill the housing 4 perfectly. The bead 3 on the single side is engaged with the rim to finish filling work.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a method for filling a tubeless tire, particularly a tubeless tire with low internal pressure for running on uneven terrain, by filling the housing of the tubeless tire with an elastomer foam material to make a no-pack tire. The present invention relates to a method and a foamed filler.

(Prior art) Tubeless tires, for example, low internal pressure tires for running on rough terrain called buggies, usually weigh between 0.15 and 0.45 kg.
Air is filled to an internal pressure of /ci.

These tires do not have high air pressure like those for regular vehicles, but they can support the load to a certain extent even when packed, but they have the disadvantage that the tires will wear out quickly if you drive with them packed, and the ride will be very uncomfortable. Therefore, in conventional general tires, the inside of the tire is completely filled with elastomer sponge instead of air, as disclosed in Japanese Utility Model Application Publication No. 52-50401,
It is disclosed in Japanese Patent Publication No. 62-53341.

The latter publication discloses a method for manufacturing a filled tire in which the tire is filled with an elastomer sponge, in which a filler injection valve with an air release tube inserted inside is attached to the tire rim, and After injecting the liquid filler while removing air, it is foamed and hardened.

(Problems to be Solved by the Invention) However, since the conventional method injects the liquid filler while removing air from inside the tire housing, it requires a special device and a special wheel rim. It cannot be directly applied to tires and wheel rims, and
Since the liquid filler is cured and foamed within the tire housing, there is a problem in that there are restrictions on the liquid filler that can be used.

In view of the above, it is an object of the present invention to provide a foam filling method and a foam filling body that can be easily applied to conventional commercially available tires and wheel rims without using a liquid filler and therefore without using special equipment. purpose.

(Means for solving the problem) The following configuration was adopted as a means for achieving the above objective. In other words, the method for filling a tubeless tire with foam material is to use continuous foam material made of elastomer, combine multiple pieces to form a segmented foam material that has a substantially similar shape to the tire housing, and then cover this segmented foam material with a plastic film. The foam material is placed inside a pack, and then the pressure inside the pack is reduced to shrink the foam material to form a foam filling, and the foam filling is inserted and filled into the housing through the gap between the bead and the rim on one side of the tire. The foam pack is then broken open to expand the foam, and the beads are then fitted into the rim.

The divided foam material has a volume of 80 to 150% of the inner volume of the tire housing, and the plastic film pack has a high degree of airtightness. , an inert lubricant is applied.

The foam filling used in the above-mentioned filling method is a split foam material made of elastomer continuous foam material, which is made into a shape substantially similar to the tire housing by combining multiple pieces, and is housed inside a plastic film pack that can reduce the pressure. be. The divided foam material has an inner volume of 80 to 80% of the inner volume of the tire housing.
150% volume, the plastic film pack has a high degree of airtightness, and the pack is equipped with an exhaust valve.

Further, the foam filler can be made of a split foam material of an elastomer foam material that is formed into a shape substantially in the same shape as the tire housing by combining a plurality of foam fillers, and is compressed and placed inside a plastic film pack. .

(Function) Remove the bead on one side of the tire from the rim to create a gap between the bead and the rim, and from there, the foam filling material, which is depressurized and has a small volume, is sequentially inserted and filled into the housing.

Next, inert lubricant is injected into the gap between the bead and the rim using a spray or the like. After this injection, when a cutter such as a knife is inserted through the gap between the bead and the rim to tear the film pack of the foam filling material, the divided foam material in the pack immediately expands and is filled into the housing.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing a partial cross section of a tubeless tire for running on rough terrain with low internal pressure, in which the foam filling method of the present invention is applied.

In the figure, 1 is a tubeless tire, 2 is a wheel rim, and the bead 3 of the tire 1 is attached to the outer periphery of this rim 2. The internal pressure within the housing 4 of this tire 1 is normally set to an air pressure of 0.15 to 0.45 kg/cJ, which is a so-called low internal pressure. 5 is a foam material filled into the housing 4 by the method of the present invention.

The foam material 5 is an elastic material such as polyurethane, that is, a continuous foam material of elastomer, and its specific gravity is 0.05 to 0.05.
It is about 0.06. The reason why the elastomer is an open foam material is that it can be contracted by reducing the pressure within the plastic film pack, as will be described later.

In the present invention, the above-mentioned foam material 5 is used to create the split foam material 6. As shown in FIG. The shapes are approximately similar. As shown in FIG. 2, this split foam material 6 is created by forming a material having approximately the same shape (similar shape) to the housing 4 using a mold or the like using a conventional known method, and then cutting this material at the portion shown by the dotted line. It can be obtained by However, this segmented foam material 6 may be made from the beginning in the shape shown in FIG. 3. Although the divided foamed material 6 is divided into four equal parts in the above disclosure, it is of course not limited to this. On the other hand, the total volume of the divided foamed material 6 (volume of divided foamed material x number of pieces) is equal to that of the housing 4. It is said to be 80 to 150% (filling rate) of the internal volume. In this case, with a filling rate of 80%, after filling the housing 4, a gap will be created between the housing 4 and the split foam material 6, but such a gap cannot be packed. However, sufficient rigidity is maintained.

However, a filling rate of 100% or more is preferred.

FIG. 4 is a perspective view of the foam packing 7 of the present invention before the pressure is reduced, and FIG. 5 is a perspective view after the pressure is reduced. In the figure, 8 is a film pack formed of a bag-shaped plastic film (including a sheet), and the film preferably has a high degree of airtightness, and thermoplastic plastic is used. An exhaust valve 9 is provided in the section. One piece of the split foam material 6 is placed into the pack 8 through an opening (not shown) at the bottom of the pack opposite the exhaust valve 9, and the opening is welded 8'. Next, when the air inside the pack 8 is removed using a vacuum machine through the exhaust valve 9 and the pressure is reduced, the pack 8 shrinks and first adheres to the surface of the split foam material 6. When the pressure is further reduced, the pack 8 and the split foam material 6 are separated. Both shrink at the same time, forming a foam filling body 7 with a small volume as shown in FIG. In addition,
The exhaust valve 9 becomes a hindrance after filling the tire housing, so it is removed and the removed portion is welded. At this time, since the divided foamed material 6 is an open foamed material, the air contained in the foamed material is properly discharged, and as a result, it contracts and becomes much smaller as a whole compared to FIG. 4.

FIG. 6 is a perspective view of another embodiment of the foam filling body 7' used in the present invention. In the figure, the segmented foam material 6'' is a continuous foam material or a discontinuous foam material made of elastomer.This segmented foam material 6'' is compressed by mechanical means etc.
The outside thereof is covered with a plastic film pack 8 to maintain the compressed state. Also, split foam material 6
'' may be placed inside a heat-shrinkable film pack, compressed by mechanical means, and then heated to shrink the film to maintain the compressed state.

Next, the order in which the foam filler 7 shown in FIG. 5 (with the exhaust valve 9 removed) formed as described above is filled into the tire housing 4 will be explained.

First, the bead 3 on one side of the tire 1 is removed from the rim 2, the space between the bead 3 and the rim 2 is forcibly opened using a jig or the like to form a gap 10, and the tire housing 4 is opened from this gap 10.
The foam filling body 7 is inserted inside.

Next, the remaining filling bodies 7 are inserted in the same manner. After that, an inert lubricant such as silicone resin is injected and sprayed onto the film back surface of the filler 7 and the inner surface of the tire housing 4 using a spraying means, and then the jig is removed and the opening of the gap 10 is narrowed. By inserting a sharp blade such as a knife through this narrowed part and cutting a part of the pack 8, air immediately enters the pack 8 and the decompression state is released, and each of the divided foam materials 6 inside is moved with force. It expands well and completely fills the inside of the housing 4. Finally, the filling operation is completed by fitting the bead 3 and rim 2 on one side.

The purpose of using the inert lubricant is to prevent deterioration of the segmented foam material 6 due to the generation of frictional heat inside the tire.

The tubeless tires that have been filled as described above are 0
Although the internal pressure can be used, the internal pressure can be set to, for example, 0.15 to 0.45 kg/csI by pumping air into the tire from an air valve provided on the rim as usual.

The results of the actual vehicle test are shown below.

(1) As an actual vehicle durability test machine, the tires of the present invention (filling rate = 90%) were used on a 300cc 2WD practical vehicle (4 wheels) on steady roads, uphill, downhill, in places with fist-sized rocks, and in puddles. A driving test of 1,100 km at an average speed of 29 km was conducted on a 1.7 km test course with a flat road surface, etc., but the foam filling inside the tire was not destroyed or damaged at all.

(2) Static property data The static properties were tested using a foam material with a specific gravity of 0.056 and a tire size of AT24X9-11, as shown in Table 1 below. Ta.

Table 1 Table 2 It can be seen from the above tables that the tire of the present invention has sufficient rigidity and there is no risk of the tire being crushed.

(3) As a handling stability test machine, a 300cc 2WD practical vehicle (4 wheels) was equipped with the tires of the present invention (front wheels: filling rate 103%, rear wheels: filling rate 90%).
The results of a steering stability test using a foamed material with a specific gravity of 0.056 were as shown in Table 2 below.

(Next leaf) Numbers are based on the 5-point system.

From the table above, the tire of the present invention packs In this case, the handling stability is almost the same as the standard product.

(Effects of the Invention) According to the present invention, since no liquid filler is used, there is no need for a special filler filling device as in the past, and there is no need for a special rim as in the past. It is extremely advantageous in that it can be immediately applied to the rim, and the filling method is simple, and it can be provided at low cost.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing a partial cross section of a tubeless tire for low internal pressure running on rough terrain, in which the foam filling method of the present invention is carried out, and Fig. 2 is an explanatory diagram of the split foam material before splitting. , FIG. 3 is an explanatory diagram after the same division, FIG. 4 is a perspective view of the foam filling before depressurization, FIG. 5 is a perspective view of the foam filling after depressurization, and FIG. FIG. DESCRIPTION OF SYMBOLS 1...Tire, 2...Wheel rim, 3...Bead, 4...Housing, 5...Foam material, 6...Divided foam material, 7...Foam filler, 8... ...Plastic film bank, 9...Exhaust valve, 10...Gap. Figure 6

Claims (8)

[Claims] (1) A method of filling a foam material into the housing of a tubeless tire attached to a wheel rim, the segmented foam material forming a substantially similar shape to the tire housing by combining multiple pieces of continuous foam material made of elastomer. This split foam material is placed inside a plastic film pack, and then the pressure inside the pack is reduced to shrink the foam material into a foam filling, and this foam filling is placed between the bead and rim on one side of the tire. A method for filling a tubeless tire with a foam material, which comprises inserting and filling the foam material into a housing through a gap between the tubeless tires, then tearing a pack of the foam filling material to expand the foam material, and then fitting a bead into a rim. (2) The divided foam material is 80 to 80% of the inner volume of the tire housing.
The method for filling a tubeless tire with foam material according to claim 1, wherein the foam material has a volume of 150%. (3) The method for filling a tubeless tire with foam material according to claim (1), wherein the plastic film pack has a high degree of airtightness and is provided with an exhaust valve. (4) When inserting the foam filling into the housing from the gap between the bead and the rim on one side of the tire, an inert lubricant is applied between the housing and the foam filling or/and the foam filling. Method of filling foam material into tubeless tires as described. (5) A foam filler characterized in that a plurality of divided foamed elastomer continuous foamed materials, which are formed into a shape substantially similar to that of a tire housing by combining a plurality of pieces, are housed in a plastic film pack in a vacuum compressed state. (6) The divided foam material is 80 to 80% of the inner volume of the tire housing.
The foam filling according to claim 5, which has a volume of 150%. (7) The foam packing according to claim (5), wherein the plastic film pack has a high degree of airtightness and is provided with an exhaust valve. (8) A foam filling body comprising a compressed segmented foamed material of elastomer foamed material, which is formed into a shape substantially similar to that of a tire housing by combining a plurality of foamed materials, and is housed inside a plastic film pack.