JP2009292455A - Recovery method of sealant and wedge tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily recover sealant of a tire rim assembly regardless of a tire valve without soiling its circumference. <P>SOLUTION: A clearance is provided between a bead part 14 and the rim 18 by using a tire lever and the like, the wedge tool 22 is inserted into the clearance and a flange 18D of the rim 18 is fitted into a groove 22E of the wedge tool 22. One end of a tube 26 is inserted into the tire from the clearance 24 on the side of the wedge tool 22 formed between the rim 18 and the bead part 14 and the other end of the tube 26 is connected with an elastically deformable container 28. Since the container 28 is expanded and a pressure of the container side is lowered by pressing (crushing) the container 28 by hand and the like to elastically deform it and then loosen the hand to release the container 28, the sealant 20 in the tire is sucked into the container 28. The sealant 20 in the tire can be recovered into the container 28 by repeating this a plurality of times. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a sealing agent recovery method for recovering a sealing agent in a tire / rim assembly, and a wedge jig used for recovering the sealing agent.

  In recent years, when a tire / rim assembly mounted on a vehicle punctures, a liquid sealing agent (a puncture repair solution) is injected into the tire / rim assembly to repair the tire puncture hole and to reduce the internal pressure. Tire sealing devices that pressurize (pump up) to a predetermined reference pressure are in widespread use.

  Since the sealing agent remains in the tire / rim assembly that has been repaired by the tire sealing device as described above, the tire / rim assembly is mounted sideways on the tire changer, and the tire is removed from the rim. When trying to remove and replace, there is a problem that the sealing agent leaks from the gap between the tire and the rim, and the sealing agent is scattered around.

Therefore, as a method for solving such inconvenience at the time of tire replacement, for example, in Patent Document 1, the rubber portion of the tire valve is cut with a cutter or the like, the tire valve is removed from the rim, and the tire valve is removed. A method is disclosed in which a hose is inserted from the valve hole of the rim, and the sealing agent in the tire is sucked and collected.
JP-A-10-67212

  However, in the above conventional method, (1) the rim is damaged when the rubber part is cut with a cutter, (2) the tire valve after the rubber part is cut cannot be reused, (3) there is no rubber part, all of which is metal In the case of a tire valve made of, there is a problem that it cannot be cut with a cutter.

  SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem. A method for recovering a sealing agent capable of recovering a sealing agent for a tire / rim assembly without polluting the surroundings with the sealing agent and irrespective of a tire valve. And a wedge jig for use in recovering the sealing agent.

  The invention according to claim 1 is a method of recovering a sealing agent for recovering a liquid sealing agent from the inside of a tire / rim assembly in which a pneumatic tire is mounted on a rim. A first step of inserting a wedge between the rim and the bead portion above the sealing agent accumulated inside and below the sealing agent, and forming a gap between the rim and the bead portion; And a second step of inserting the tube into the tire and sucking the sealing agent in the tire.

Next, a method for recovering the sealing agent according to claim 1 will be described.
In the first step, a wedge is inserted between the bead portion and the rim above the sealing agent accumulated in the lower portion of the tire / rim assembly. Thereby, a gap is formed between the rim and the bead portion on both sides of the wedge. Since the position of the sealing agent liquid level in the tire is difficult to check from the outside, when inserting the wedge, the tire / rim assembly is left standing for a while, and the internal sealing agent accumulates in the lower part of the tire. After that, it is preferable to insert a wedge above the rotating shaft.

In the next second step, a tube is inserted into the tire through a gap on the side of the wedge formed between the rim and the bead portion, and the sealing agent in the tire is sucked.
In the sealing agent recovery method according to the first aspect of the present invention, it is not necessary to cut the tire valve with a cutter or the like, so that the rim is not damaged.

  The invention according to claim 2 is characterized in that, in the sealing agent recovery method according to claim 1, a lubricant is applied to a portion where the wedge contacts the pneumatic tire.

  When a wedge is inserted between the bead portion and the rim, a part of the bead portion is pushed by the wedge and elastically deformed inward of the tire. At this time, if the pneumatic tire does not slide on the surface (slope) of the wedge, a force for the pneumatic tire to return to the original shape acts on the contact portion between the pneumatic tire and the wedge, and as a result, Since the force to remove from the rim works, there is a case that the wedge is detached from the rim unless the wedge is held by hand.

In the method for recovering a sealing agent according to claim 2, by applying a lubricant to a portion where the wedge and the pneumatic tire are in contact with each other, the frictional resistance of the contact portion between the wedge and the pneumatic tire can be reduced, The tire can be easily slid on the surface of the wedge disposed between the rim and the tire.
When the pneumatic tire slides on the surface (slope) of the wedge, the force from the pneumatic tire is released, and the force to remove the wedge from the rim does not work. Therefore, even if the inserted wedge is not held by hand, it does not come off the rim, and the work of sucking the sealing agent in the tire from the gap between the tire and the rim becomes easy.

According to a third aspect of the present invention, in the sealing agent recovery method according to the second aspect, the lubricant is applied to the wedge.
In the sealing agent recovery method according to the third aspect, the pneumatic tire can be slid by the lubricant applied to the pneumatic tire contact portion of the wedge.

  The invention according to claim 4 is used in the method for recovering a sealing agent according to any one of claims 1 to 3, and a tube for sucking the sealing agent between the bead portion and the rim. A wedge jig for forming an insertable gap, and a groove portion into which the flange of the rim is inserted, and when the flange is inserted into the groove portion, the side surface of the bead portion is pressed inward in the rim width direction. And a pressing surface that forms a gap between the rim and the bead portion.

Next, the operation of the wedge jig according to claim 4 will be described.
In the wedge jig according to the fourth aspect, since the flange of the rim can be inserted into the groove portion, the wedge jig is inserted between the rim and the bead portion, and the pressing surface of the wedge jig is opposite to the outer side in the tire axial direction from the bead portion. Even if the force is received, since the flange of the rim is inserted into the groove, it is possible to prevent the rim from coming into contact with the groove wall of the groove and detaching the wedge jig outward in the tire axial direction.

According to a fifth aspect of the present invention, in the jig according to the fourth aspect, an angle θ formed between the lower surface on which the groove is formed and the pressing surface is set within a range of 30 ° to 60 °.
Next, the operation of the wedge jig according to claim 5 will be described.
When the angle θ between the lower surface where the groove is formed and the pressing surface is set within a range of 30 ° to 60 °, the tire side surface is inclined when the wedge jig is inserted into the gap between the pneumatic tire and the rim. It can be easily slid, the rotational force to remove the wedge jig from the rim can be released, and the wedge jig can be prevented from coming off.

  According to a sixth aspect of the present invention, in the wedge jig according to the fourth or fifth aspect, when the flange is inserted into the groove portion, the pressing surface is on the inner side in the rim width direction than the bead sheet of the rim. It is located in

Next, the operation of the wedge jig according to claim 6 will be described.
In the wedge jig according to the sixth aspect, when the flange is inserted into the groove portion, the pressing surface is located on the inner side in the rim width direction than the bead seat of the rim, so that the bead portion can be deeply pushed inward in the tire width direction. It is possible to make a large gap between the rim and the bead portion.

  According to a seventh aspect of the present invention, in the wedge jig according to the sixth aspect, the through hole through which the tube can be inserted has a through hole at one end of the through hole when the flange is inserted into the groove portion. It is characterized in that it faces inward and the other end faces the outside of the tire.

Next, the operation of the wedge jig according to claim 7 will be described.
When the wedge jig according to claim 7 is inserted between the bead portion and the rim and the flange is inserted into the groove portion, one end of the through hole formed in the wedge jig is on the inside of the tire and the other end is on the outside of the tire. Turn to.
Therefore, if the tube is inserted into the through hole of the wedge jig, the tube can be inserted into the tire.

  As described above, the sealing agent recovery method and the wedge jig of the present invention can recover the sealing agent of the tire / rim assembly without polluting the surroundings with the sealing agent and irrespective of the tire valve. , Has an excellent effect.

[First Embodiment]
Hereinafter, a first embodiment of a method for recovering a sealing agent of the present invention will be described in detail with reference to FIGS.
(Description of tire / rim assembly)
In FIG. 1, reference numeral 10 denotes a tire / rim assembly, reference numeral 12 denotes a pneumatic tire, reference numeral 14 denotes a bead portion, reference numeral 16 denotes a tire side portion, reference numeral 18 denotes a rim, reference numeral 18A denotes a drop of the rim 18, reference numeral 18B denotes a rim. Reference numeral 18 denotes a bead sheet of the rim 18, and reference numeral 18 D denotes a flange portion of the rim 18.
Here, the outer diameter of the well portion 18B is smaller than the outer diameter of the bead sheet 18C, and the outer diameter of the drop 18A is set smaller than the outer diameter of the well portion 18B. Further, the outer diameter of the drop 18 </ b> A is set smaller than the inner diameter of the bead portion 14.

  Reference numeral 20 denotes a liquid sealing agent for repairing puncture. The sealing agent 20 is configured, for example, by dispersing rubber latex in a colloidal form in a liquid component such as water. Various types of such sealing agents 20 are currently available on the market. Typical examples thereof include NR (natural rubber) latex, SBR (styrene butadiene rubber) latex, and NBR (acrylonitrile-butadiene). Rubber) A material mainly containing an aqueous solution containing a rubber latex such as latex and added with a resin-based adhesive added in the form of an aqueous dispersion or an aqueous emulsion. In such an aqueous solution, an antifreezing agent such as glycol, ethylene-glycol, and propylene glycol, a pH adjuster, an emulsifier, a stabilizer, and the like are generally added. Furthermore, in order to improve the sealing performance against puncture holes, fiber materials made of polyester, polypropylene, glass, etc., fillers (fillers) made of whiskers, calcium carbonate, carbon black, etc., silicate and polystyrene particles as necessary. Etc. are added.

(Wedge jig)
Next, a wedge jig for forming a gap between the bead portion 14 and the rim 18 will be described.
As shown in FIG. 2, the wedge jig 22 of the present embodiment is entirely block-shaped, and the upper surface 22A and the lower surface 22B are parallel to each other, and one side portion (the arrow L direction side in FIG. 2). An inclined surface 22C as a wedge is provided, and a vertical surface 22D is provided on the other side portion (the arrow R direction side in FIG. 2). The inclined surface 22C is inclined with respect to the upper surface 22A and the lower surface 22B, and the vertical surface 22D is perpendicular to the upper surface 22A and the lower surface 22B. Further, the wedge jig 22 is formed with a rectangular groove 22E on the lower surface side.
The angle θ formed between the lower surface 22B and the inclined surface 22C is preferably set within a range of 30 ° to 60 °.

  The wedge jig 22 can be attached to the tire / rim assembly 10 as shown in FIGS. As shown in FIGS. 3 and 4, when the wedge jig 22 is mounted on the rim 18 so that the flange 18D of the rim 18 is inserted into the groove 22E, the lower surface 22B on the inclined surface side of the groove 22E It is located on the bead sheet 18C (outside in the tire radial direction). And the front-end | tip part of 22 C of inclined surfaces is located in the rim inner side edge part of the bead seat 18C, the bead part 14-side part 16 of the pneumatic tire 12 is pressed by the inclined surface 22C, and the bead part 14 is the bead seat 18C. Further, the gap 24 (a halftone dot portion in FIG. 3) is formed between the bead portion 14 and the rim 18.

Next, the process for recovering the sealing agent will be described.
(1) First, in the first step, the tire / rim assembly 10 is evacuated and a gap is formed between the bead portion 14 and the rim 18 using a tire lever or the like, and FIG. 3 and FIG. 4, the wedge jig 22 is inserted, and the flange 18 </ b> D of the rim 18 is fitted into the groove 22 </ b> E of the wedge jig 22.
After the wedge jig 22 is fitted in the groove 22E, the tire lever or the like may be removed. Alternatively, the tip of the wedge jig 22 may be pushed between the bead portion 14 and the rim 18 without using a tire lever or the like, and a gap may be opened between the bead portion 14 and the rim 18.
Since it is difficult to confirm the position of the liquid level of the sealing agent 20 in the tire from the outside, the tire / rim assembly 10 is left to stand for a while before a gap is formed between the bead portion 14 and the rim 18. After the internal sealing agent 20 has accumulated in the lower part of the tire, it is preferable to insert the wedge jig 22 with a gap above the rotating shaft.

(2) In the second step, one end of the tube 26 is inserted into the tire from the gap 24 on the side of the wedge jig 22 formed between the rim 18 and the bead portion 14, and the other end of the tube 26 is elastic. Connect to deformable container 28. The container 28 is made of a flexible synthetic resin or the like. Note that one end of the tube 26 is disposed so as to reach the bottom portion of the sealing agent 20.

Then, the container 28 is compressed (crushed) by hand or the like and elastically deformed, and then the hand 28 is released and the container 28 is opened, so that the container 28 expands and the pressure on the container side becomes low. The sealing agent 20 is sucked into the container 28. By repeating this several times, all of the sealing agent 20 in the tire can be extracted and collected in the container 28.
Thus, in this embodiment, the tire valve is not cut by a cutter or the like and the rim 18 is not damaged, and the sealing agent 20 in the tire can be easily recovered regardless of the type of the tire valve.
Note that the wedge jig 22 may be extended in length by extending the vertical surface 22D side so as to be easy to handle, as indicated by a two-dot chain line in FIG.

By the way, when the wedge jig 22 is inserted into the gap, as shown in FIG. 4, the portion of the bead portion 14 in contact with the wedge jig 22 (and the vicinity thereof) is radially inward from the bead sheet 18 </ b> C of the rim 18, And it will be forced into the inside of the tire. For this reason, the force F (the direction of which is the direction of the rim 18) that tries to return to the original position (the position on the bead seat 18C) is applied to the portion of the bead portion 14 in contact with the wedge jig 22 (and the vicinity thereof). The diagonal direction which becomes an axial direction outer side and radial direction outer side) acts. In the case of FIG. 4, a rotational force FR that rotates in the direction of arrow C is generated in the wedge jig 22 by the force F from the tire.
Note that the wedge jig 22 cannot rotate unless it pushes up the bead part 14 even if it tries to rotate in response to the force F from the pneumatic tire 12. Further, the wedge jig 22 does not come off the rim 18 until it rotates to some extent.

  In the wedge jig 22 of the present embodiment, the angle θ formed by the lower surface 22B and the inclined surface 22C is set within the range of 30 ° to 60 °, so the wedge jig 22 is placed in the gap between the pneumatic tire 12 and the rim 18. When inserting, the side surface of the tire can be easily slid by the inclined surface 22 </ b> C, so that the rotational force FR for removing the wedge jig 22 from the rim 18 can be released. Therefore, even when the pneumatic tire 12 is flat (particularly when the rotational force for removing the wedge jig 22 is strong), the wedge jig 22 can be prevented from being detached from the tire / rim assembly 10. .

However, when the angle θ is less than 30 °, when the wedge jig 22 is intentionally rotated in the direction opposite to the rotational force FR, the amount of pushing up the bead portion 14 is reduced, so that the rim can be easily rotated. 18 (e.g., there is a possibility that the wedge jig 22 may come off with a force that can be touched by the operator during the collection operation).
On the other hand, when the angle θ exceeds 60 °, the angle θ of the inclined surface 22C is steep, so that the rotational force FR for removing the wedge jig 22 is likely to be applied, and the wedge jig 22 is easily detached.
The angle θ is more preferably set within a range of 40 ° to 50 °.

[Second Embodiment]
Next, a wedge jig 22 according to a second embodiment of the present invention will be described. In addition, the same code | symbol is attached | subjected to the same structure as 1st Embodiment, and the description is abbreviate | omitted.
As shown in FIG. 5, the wedge jig 30 of the present embodiment has an inclined surface 22C side extending from the bead sheet 18C in the direction of the well portion forming portion (extension indicated by a two-dot chain line) from the wedge jig 22 of the first embodiment. A portion 32A is added). The left part of the drawing with respect to the two-dot chain line in FIG. 5 is a part extending with respect to the wedge jig 22 of the first embodiment.
Further, by extending the inclined surface 22C downward in the drawing (inward in the rim radial direction) in the direction of the well 18B inside the wheel from the bead seat 18C (addition of an extended portion 32B indicated by a solid line), the space between the wheel tires is increased. Larger gaps can be maintained while being stable.

  As shown in FIGS. 6 and 7, by using the wedge jig 30 of this embodiment, the bead portion 14 can be displaced to the inside of the rim and the size of the gap 24 can be made larger than in the first embodiment. The tube 26 can be thickened (for example, a φ8 mm tube can be used), and the recovery time of the sealing agent 20 can be shortened. Further, since the gap 24 is increased, the tube 26 can be easily inserted.

[Third Embodiment]
Next, a wedge jig 30 according to a third embodiment of the present invention will be described. The wedge jig 30 of this embodiment is a modification of the wedge jig 30 of the second embodiment, and the same reference numerals are given to the same components as those of the second embodiment, and the description thereof is omitted.
As shown in FIG. 8, the wedge jig 30 of the present embodiment is formed with a tube hole 36 that communicates the inside and outside of the tire when mounted on the rim 18.
When the wedge jig 30 of this embodiment is used, the tube 26 can be inserted into the tire from the tube hole 36 and the sealing agent 20 can be collected.

[Fourth Embodiment]
In this embodiment, in order to reduce the friction with the pneumatic tire 12, for example, before inserting the wedge jig 30, the lubricant is applied to the inclined surface 22C in contact with the pneumatic tire 12.
As the lubricant, for example, bead cream, car wax, tire wax or the like can be used, but any known lubricant can be used as long as it can reduce friction with the pneumatic tire 12 and does not deteriorate the tire rubber. An agent can be used, and the material and properties of the lubricant are not particularly limited.
Note that a resin having a lower coefficient of friction than the material of the wedge jig 30, for example, a fluororesin sheet, or a fluororesin coating may be applied to the inclined surface 22 </ b> C of the wedge jig 30.

  If the pneumatic tire 12 does not slide on the inclined surface 22C of the wedge jig 30 when the wedge jig 30 is inserted between the pneumatic tire 12 and the rim 18, there is a force for the pneumatic tire 12 to return to the original shape. It acts on the contact portion between the pneumatic tire 12 and the wedge jig 30, and as a result, a force is exerted on the wedge jig 30 to remove the wedge jig 30 from the rim 18. Therefore, if the wedge is not held by hand, the rim May fall off

  In this embodiment, since the lubricant is applied to the inclined surface 22C of the wedge jig 30, the frictional resistance at the contact portion between the wedge jig 30 and the pneumatic tire 12 is reduced, and the pneumatic tire 12 is attached to the wedge jig 30. The force received from the pneumatic tire 12 by sliding the inclined surface 22C to the upper surface 22A side is released, and the force F (see FIG. 9) for removing the wedge jig 30 from the rim 18 does not act on the pneumatic tire 12 and is inserted. The wedge jig 30 is stably held between the rim 18 and the pneumatic tire 12. Therefore, it is not necessary to continue to hold the inserted wedge jig 30 by hand or the like, and the sealing agent recovery operation becomes easy. Further, by applying a lubricant to the wedge jig 30, no matter which part of the tire comes into contact with the wedge jig 30, the surface of the wedge jig can be reliably slid.

If the tip of the wedge jig 30 is pushed between the bead portion 14 and the rim 18 without using a tire lever or the like to open a gap between the bead portion 14 and the rim 18, the bead portion 14 can be obtained by using a lubricant. The friction is reduced and the push-in operation becomes easy.
In the present embodiment, the lubricant is applied to the inclined surface 22C. However, if the lubricant can be applied to the contact portion between the pneumatic tire 12 and the wedge jig 30, the lubricant is applied to the pneumatic tire 12. Also good.
In this embodiment, the example in which the lubricant is applied to the wedge jig 30 has been described. However, even if the lubricant is applied to the wedge jig 22 described above, the same effect as when the lubricant is applied to the wedge jig 30 is obtained. Of course, it is obtained.

(Test Example 1)
The method for recovering the sealing agent according to the present invention (Examples 1 and 2) and the conventional method for recovering the sealing agent (Conventional Examples 1 to 4) were carried out to compare the workability. The results are as described in Table 1 below. “Valve cut + flocculant” in the column of form means that the flocculant is introduced into the hole after removing the valve. “Valve cut + dropper” means the hole after removing the valve. This means that the sealing agent is sucked out with a dropper. “Rim unrolling + flocculant” means that a gap is formed between the tire and the rim, and then the flocculant is introduced through the gap. This means that a gap is opened between the rim and the rim, and then the sealing agent is sucked out from the gap with a dropper.

  On the other hand, “low flat tire” in the column of workability means that a tire with a flatness ratio of 50% or less was used, and “metal valve” means that the valve body is fixed to the rim with screws, nuts, etc. Means a structure that is difficult or cannot be removed only from the outside of the rim. Also, “○” in the workability column indicates that workability is good, “×” indicates that workability is poor or cannot be performed, and “◎” indicates that the wedge jig is not held by hand. However, it shows that workability is good.

The methods of Conventional Examples 1 and 2 may not be applicable to rims using metal valves.
In the methods of the conventional examples 3 and 4, when the tire is low flat (for example, flatness of 50% or less), when the rim is unwound by a tire changer that holds the tire / rim assembly horizontally, When a gap is formed between the rim and the inner sealing agent leaks from the gap, the surroundings of the tire changer and the like are soiled.
On the other hand, in the methods of Examples 1 to 8 to which the present invention was applied, the sealing agent in the tire could be easily recovered without soiling the surroundings with the sealing agent, regardless of the tire valve and the flatness of the tire.

(Test Example 2)
A plurality of types of wedge jigs with different angles of the inclined surface were created, and the workability was compared.
“◯” in the workability column indicates that workability is good, and “◎” indicates that workability is particularly good.

  From the test results, it can be seen that when working with a low flat tire, there is a suitable range for the angle of the inclined surface of the wedge jig in order to keep the workability particularly good.

It is sectional drawing of the tire rim assembly in which the sealing agent was put. It is a perspective view of the wedge jig which concerns on 1st Embodiment. 1 is a perspective view of a tire / rim assembly into which a wedge jig according to a first embodiment is inserted. 1 is a cross-sectional view of a tire / rim assembly into which a wedge jig according to a first embodiment is inserted. It is a perspective view of the wedge jig which concerns on 2nd Embodiment. It is a perspective view of the tire and rim assembly which inserted the wedge jig concerning a 2nd embodiment. It is sectional drawing of the tire and rim assembly which inserted the wedge jig concerning 2nd Embodiment. It is a perspective view of the tire and rim assembly which inserted the wedge jig concerning a 3rd embodiment. It is a perspective view of the tire rim assembly which inserted the wedge jig.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Tire / rim assembly 12 Pneumatic tire 14 Bead part 18C Bead sheet 18 Rim 20 Sealing agent 22 Wedge jig 22B Lower surface 22C Inclined surface (pressing surface)
22E Groove (groove)
30 Wedge jig 36 Tube hole (through hole)
θ angle

Claims (7)

A sealing agent recovery method for recovering a liquid sealing agent from the inside of a tire / rim assembly in which a pneumatic tire is mounted on a rim,
A wedge is inserted between the rim and the bead portion above the sealing agent accumulated in the lower part of the tire / rim assembly, and a gap is formed between the rim and the bead portion. Process,
A second step of inserting a tube into the tire from the gap and sucking the sealing agent in the tire;
A method for recovering a sealing agent, comprising:   The method for recovering a sealing agent according to claim 1, wherein a lubricant is applied to a portion where the wedge and the pneumatic tire are in contact with each other.   The method for recovering a sealing agent according to claim 2, wherein the lubricant is applied to the wedge. It is used for the recovery method of the sealing agent of any one of Claims 1-3, and forms the clearance gap which can insert the tube for attracting | sucking a sealing agent between a bead part and a rim | limb. A wedge jig,
A groove into which the flange of the rim is inserted;
When the flange is inserted into the groove, a pressing surface that presses the side surface of the bead portion inward in the rim width direction to form a gap between the rim and the bead portion;
A wedge jig characterized by comprising:   The jig according to claim 4, wherein an angle θ formed between the lower surface on which the groove is formed and the pressing surface is set in a range of 30 ° to 60 °.   6. The wedge jig according to claim 4, wherein when the flange is inserted into the groove portion, the pressing surface is positioned on the inner side in the rim width direction than the bead sheet of the rim. Having a through-hole through which the tube can be inserted;
The wedge jig according to claim 6, wherein when the flange is inserted into the groove portion, one end portion of the through hole faces the inside of the tire and the other end faces the outside of the tire.

Images