JPS6034451B2 - Manufacturing method for filled tires - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a method for manufacturing a filled tire.
In more detail, we are talking about filled tires, in which a truck, bus or light truck tire, which is normally used with a tire tube, is assembled into a tubeless rim and then filled with puncture-prevention filler. This relates to a manufacturing method.

Conventionally, in order to turn a truck/bus or light truck tire, which is normally used with a tire tube, into a filled tire with puncture prevention filler filled inside the tire, the following steps are required. I needed it.

That is, [1] The inner surface of the tire and the outer surface of the tire tube that is in close contact with the inner surface of the tire are buffed to expose fresh surfaces of each.

■ Apply adhesive to the exposed fresh side of the inner surface of the tire and the outer surface of the tire tube.

{3' The tire tube coated with adhesive is filled with tire internal pressure and pressed against the inner surface of the tire, and the tire tube and tire are bonded together.

■ Attach a tire flap as necessary to the tire with the tire tube glued together, and assemble the tire to the wheel rim.

'5} Use a drill to create an air vent hole in the tread that penetrates the tire interior formed by the tire and wheel rim.

'6) Fill the inner part of the tire through which the air vent hole has penetrated with puncture prevention filler from the Valvero of the tire tube until it overflows from the air vent hole, and stop filling when it overflows from the air vent hole. Block the vent hole.

'7} The inner chamber of the tire, which has become a closed space due to the air vent hole being blocked, is further filled with puncture prevention filler material until the predetermined internal pressure is reached, and the tire is vulcanized naturally at room temperature or by active heating. do.

Each step was necessary.

In this way, in order to manufacture a filled tire using a tire tube, the process of gluing the tire tube together with the tire requires a lot of time and adhesive for buffing the inner surface of the tire and the outer surface of the tire tube. After application, it is essential to leave the coating for a long time until the adhesion between the tire and the tire tube is completed, and this has been the biggest factor hindering productivity improvement in the manufacture of filled tires. Therefore, this invention was made to completely eliminate the drawbacks of the prior art as described above, and its purpose is to completely eliminate tire tube adhesion, which was essential in the production of conventional filled tires, and to It is an object of the present invention to provide a method for manufacturing a filled tire that significantly improves productivity in tire manufacturing and dramatically reduces manufacturing costs.

The method for manufacturing a filled tire according to the invention includes disposing a circular rubber sheet smaller than the diameter of the wheel rim at a position corresponding to the bead layer on the wheel rim to prevent leakage of filler material for puncture prevention; A first step of mounting the tire on the rim without a tire tube, and forming at least one vent hole penetrating the inner surface of the tire in the tread portion of the tire, and the first step A second step of filling the inner tire chamber formed by the tire and the wheel rim with a puncture prevention filler until it overflows from the air vent hole, and closing the air vent hole using a closing member. and a third step of filling the tire inner chamber, which has become a closed space by closing the air vent hole in the second step, with the puncture prevention filler until a predetermined filling pressure is reached, and then vulcanizing it.
This is a method for manufacturing a filled tire, characterized in that it includes the steps of: An embodiment of the present invention will be described in detail below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a wheel rim used for trucks, buses, light trucks, etc., and this wheel rim 1 is generally called a shallow rim or a wide flat rim.

The wheel rim 1 includes a cylindrical flat bottom part 2, a rim flange part 3 extending radially outward from one axial end of the flat bottom part 2, and a radially inner end of the flat bottom part 2 at the other end in the bag line direction. The flat bottom part 2 has at least one hole 5 penetrating its inner and outer peripheral surfaces, and this hole 5 has a pipe with an inner diameter of 30 mm or more. 6 is inserted and fixed.This wheel rim 1 is inserted and fixed at one end of the outer periphery of the flat bottom portion 2, that is, at a position 7 corresponding to the bead portion.
An annular rubber sheet 8 for preventing puncture-preventing filler leakage is tightly attached to the rim. On the other hand, flat bottom part 2
The other end on the outer periphery, that is, the bead part corresponding to the war calendar position 9
A ring-shaped rubber sheet 10 for preventing bank-preventing filler leakage and having a smaller diameter than the rim diameter of the wheel rim is tightly attached to the wheel rim. The inner surface of this annular rubber sheet 10 is in contact with the side ring 4.
The thickness of the facing portion 10a facing the dividing position is made 1.0 to 1.5 thicker than the other portions. The annular rubber sheets 8 and 10' mentioned above are made of the same rubber material as a commonly used tire flap, and have a thickness of 1.0 to 5.5 mm. A range of enemies is preferred. 1 1 is a tire used for trucks, buses, light trucks, etc., and this tire 11 has beads 12 and 12, respectively.
A pair of bead portions 13, 13' into which a radial arrow 13' is driven, and a pair of sidewall portions 14, 14' extending radially outward without reaching the bead portions 13, 13', respectively.
and a tread portion 15 spanning both sidewall portions 14, 14'.

In this tire 11, the bead portions 13, 13' are placed on the annular rubber sheets 8, 1 at positions 7, 9 corresponding to the bead portions, respectively.
By being seated through the wheel rim, it is attached to the wheel rim in an airtight manner. And this tire 11
The tire inner chamber 6 formed by the tire and the wheel rim 1 is filled with a puncture-preventing filler by a filler supply mechanism (not shown). Next, the operation of one embodiment of the present invention will be explained. In the first step, first,
After forming a hole 5 in the flat bottom part 2 of the wheel rim 1, this hole 5
Insert the pipe 6 inside and fix it.

Next, the annular rubber sheet 8 is expanded to be larger than the rim diameter. Next, this annular rubber sheet 8 is wrapped around the flat bottom part 2 while maintaining the above state, and brought to a position 7 corresponding to the bead part. At this time, if you stop expanding the annular rubber sheet 8, the annular rubber sheet 8 will expand due to elastic force. The bead is then contracted and tightly attached to the outer periphery of the bead mounting position 7. Next, the tire 11 is mounted on the wheel rim 1 without a tire tube (generally, tires used for trucks, buses, or light trucks have a built-in tire tube). At this time, the bead portion 13 is seated via the annular rubber sheet 8 at the bead portion pupil equivalent position 7, and the bead portion 13' faces the bead portion pupil equivalent position 9 with a slight gap. Next, the side ring 4 is locked to the wheel rim 1. At this time, the bead portion 13'
is moved closer to the bead portion 13 to form an appropriate gap between the side ring 4 and the bead portion 13'. Next, the annular rubber sheet 10 is expanded and attached to the bead portion 1.
3' and the position 9 corresponding to the bead part 13' and the gap between the bead part 13' and the side ring 4.
Next, when the expansion of the annular rubber sheet 10 is stopped,
The annular rubber sheet 10 contracts due to elastic force and is tightly attached to the outer periphery of the bead portion corresponding position 9 and the side ring 4. At this time, since the annular rubber sheets 8 and 10 are interposed between the tire 11 and the wheel rim, the gap between the tire 11 and the wheel rim is sealed. The state at this time is shown in FIG. In addition, if the filling pressure of the filler 17 described later is low and it is considered that the tire 11 will not fit properly in the wheel rim even if the filler 17 is filled into the inner chamber 16 of the tire 11, Compressed air is injected into the chamber 16 to fit the tire 11 to the wheel rim 1 in advance until it is in a normal state. Next, as shown in FIG.
Rotate the drill 19 of No. 8 to attach the tire 1 to the tread portion 15.
1. At least one vent hole 20 penetrating the inner surface is formed. In the second step, first, the pipe 21 of the filler supply mechanism is connected to the pipe 6.

Next, the filler supply mechanism is operated to fill the tire inner chamber 6 with the puncture prevention filler 17 via the pipes 21 and 6. At this time, the air remaining in the tire inner chamber 16 is discharged to the outside from the air receiving hole 20. Then, when the filler 17 fills the tire inner chamber 16 and overflows from the vent hole 20, the operation of the filler supply mechanism is stopped, and the filling of the filler 17 is stopped. Next, the air vent hole 20 is closed using the closing part 22. Thereby, the tire inner chamber 16 becomes a closed space. In the third step, first, the filling material supply mechanism is operated again, and the pipe 21
, 6, the filler 17 is filled into the tire inner chamber 16, which is a closed space, until a predetermined filling pressure is reached.

At this time, the pead portions 13 and 13' move away from each other due to the pressure within the tire inner chamber 16. Then, when the bead portions 13, 13' come into contact with the rim flange portion 3 and the side ring 4, the bead portions 13, 13' stop moving. Thereby, the tire 11 fits on the wheel rim 1 in a normal state. The state at this time is shown in FIG. Next, vulcanization is performed by natural vulcanization at room temperature or by active heating. Next, after removing the pipe 21 of the filler supply mechanism from the pipe 6, the pipe 6 is closed. In the above-mentioned embodiment, the annular rubber sheets 8 and 10 were tightly attached to the positions 7 and 9 corresponding to the bead portion, respectively, but in this invention, the fourth
As shown in the figure, a cylindrical rubber sheet 24 in which a hole 23 with a diameter larger than the inner diameter of the pipe 6 is formed in the central part in the axial direction is tightly attached over the entire outer circumference of the flat bottom part 2 so that the hole 23 and the hole 23 are coaxial. You may let them. In this case, following this tightening operation, the side ring 4 is engaged with the wheel rim 1 while bending the other end of the rubber sheet 24. Further, in the above-mentioned embodiment, after the side ring 4 is locked to the wheel rim, the annular rubber sheet 1 is
0 is tightly attached to the position 9 corresponding to the bead part, but in this invention, first, the annular rubber sheet 10 is tightly attached to the position 9 corresponding to the bead part mounting layer, and then the annular rubber sheet 10 is tightly attached to the position 9 corresponding to the bead part mounting layer. The side ring 4 may be locked to the wheel rim 1 while the other end of the sheet 10 is bent and pressed against the bead portion 13'. Further, in the above-mentioned embodiment, a case has been described in which the air vent hole 20 is formed in the tread portion 15 of the tire 11 after the tire 11 is mounted on the wheel rim 1. However, in this invention, the air vent hole 20 is may be formed in the tread portion 15 of the tire 11, and then the tire 11 having the air vent holes 20 formed therein may be mounted on a wheel rim. Further, in the present invention, it is not necessary to provide the hole 5 and the pipe 6 in the flat bottom portion 2. In this case, the filling material 17 may be filled through a valve. As explained above, according to the method for manufacturing a filled tire of the present invention, there is no need to adhere the tire tube to the tire, which wastes a lot of labor and time, as was done in the past, so the method for manufacturing a filled tire This results in a significant improvement in productivity in manufacturing, and in addition, a dramatic reduction in manufacturing costs.

[Brief explanation of drawings]

The attached drawings show an embodiment of the method for manufacturing a filled tire according to the present invention, and FIG. 1 is a meridian sectional view showing one embodiment, and FIGS. 2 and 3 are meridian sectional views explaining the process. FIG. 4 is a meridian cross-sectional view showing a case where an annular rubber sheet having a different shape from that shown in FIG. 1 is used. 1 is the wheel rim, 7 and 9 are the positions corresponding to the bead part, and 8
, 10 is an annular rubber sheet, 11 is a tire, 15 is a tread portion, 16 is an inner tire chamber, 17 is a puncture prevention filler, 20' is a vent hole, and 22 is a closing member. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1. Attach an annular rubber sheet smaller than the diameter of the wheel rim to the position corresponding to the bead placement on the wheel rim to prevent puncture-prevention filler from leaking, and
A first step of mounting a tire on a wheel rim without a tire tube, and forming at least one air vent hole penetrating the inner surface of the tire in the tire tread portion, and forming the tire by the first step. A second step of filling the tire inner chamber formed by the tire and the wheel rim with a puncture prevention filler until it overflows from the air vent hole, and closing the air vent hole using a closing member. and a third step in which the tire inner chamber, which has become a closed space due to the air vent holes being closed in the second step, is further filled with the puncture prevention filler material until a predetermined filling pressure is reached, and then vulcanized. A method for producing a filled tire, comprising the steps of: