JP2005138455A - Method and apparatus for producing foam-packed tire/rim assembly - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing an assembly of an integrated rim and a foam-packed tire which can pack a resin foam in a base tire and is excellent in working properties and an apparatus for the method. <P>SOLUTION: A production apparatus 1 for injecting an unvulcanized foam into the casing of the base tire T engaged with the integrated rim R is constituted of an extruder 2 extruding the unvulcanized foam and an attachment 5 which is connected with the head 3 of the extruder 2 and divides discharge channels 4 in the radiation direction of the extruder 2. A discharge nozzle 7 having a channel 6 which is connected with the tip of the attachment 5 and communicates with each discharge channel 4 is fitted. The unvulcanized foam injected from the discharge nozzle 7 is packed in the casing of the base tire T engaged with the rim R and vulcanized/cured. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method and apparatus for manufacturing a foam-filled tire / rim assembly, and more particularly, to a manufacturing method and apparatus for efficiently manufacturing a foam-filled tire / rim assembly in which a foam-filled tire is rim-assembled on an integral rim. .

  The foam-filled tire is configured as a no-puncture tire in which a pneumatic tire is used as a base tire, and a resin foam is filled in a tire casing of the base tire, and is often used for construction vehicles. Conventionally, such foam-filled tires have been manufactured by using a side ring type in which a rim flange on one side is attached or removed and a split type rim in which the rim flanges on both sides are divided as mounting rims.

  However, in recent years, pneumatic tires classified as construction vehicle type 3 tires according to JATMA standards tend to use an integral rim that does not have a split structure as described above. However, in order to form an assembly in which a foam-filled tire is assembled on an integral rim, complicated equipment and processes are required, and measures to simplify this have been required.

  As a countermeasure against such a problem, the resin foam to be inserted inside the casing of the base tire is divided into a plurality of pieces in advance, and each is embedded in a plastic film pack, and the inside is decompressed to form a compact package. There is a proposal for a base tire in which the rim is assembled to an integrated rim, after inserting it into the tire casing through the gap between the rim and the bead portion, and then inflating the resin foam by breaking the film pack (patent) Reference 1).

However, in this proposal, in addition to the very complicated process of packing the resin foam and vacuum processing, the work of inserting the shrunken package into the tire casing is extremely difficult, so it is not always satisfactory That wasn't true.
JP-A-2-84320

  SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned conventional problems, and to manufacture an assembly of an integrated rim and a foam-filled tire, which is excellent in workability so that resin foam can be easily filled into a base tire. It is to provide a method and apparatus.

  In order to achieve the above object, a method for manufacturing a foam-filled tire / rim assembly according to the present invention includes assembling a base tire on an integrated rim, and a gap between a bead portion of the base tire and a rim flange of the integrated rim. A discharge nozzle is inserted into the base tire, and an unvulcanized foam is injected into the base tire from the discharge nozzle. After filling the unvulcanized foam, the discharge nozzle is removed from the gap and sealed, and the unvulcanized foam is filled. It is characterized by vulcanizing and curing a vulcanized foam.

  Further, the foam-filled tire / rim assembly manufacturing apparatus of the present invention is an apparatus for carrying out the above-described manufacturing method, wherein an attachment for diverting a discharge flow path is connected to a plurality of unvulcanized foam extruders, The discharge nozzle is mounted so that the flow path of the discharge nozzle communicates with each of the discharge flow paths.

  The method and apparatus for manufacturing a foam-filled tire / rim assembly according to the present invention injects uncured foam in a fluidized state from a gap between a bead portion of a base tire in which a base tire is assembled on an integral rim and a rim flange of the rim. Therefore, the foam can be filled only by inserting the discharge nozzle, and the workability can be remarkably improved as compared with the case where a conventional compressed package is inserted.

  Hereinafter, the configuration of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a cross-sectional view showing an outline of a production apparatus for a foam-filled tire / rim assembly according to the present invention. FIG. 2 is a diagram of filling unvulcanized foam inside a tire casing of a base tire using the production apparatus of FIG. It is explanatory drawing which shows the situation.

  In FIG. 1, a manufacturing apparatus 1 includes an extruder 2 that extrudes unvulcanized foam, an attachment 5 that is connected to a head 3 of the extruder 2 and divides a plurality of discharge channels 4 in a radial direction of the extruder 2. A discharge nozzle 7 having a flow path 6 communicating with each of the discharge flow paths 4 of the attachment 5 is attached to the tip of the attachment 5. The discharge nozzle 7 is preferably divided into a plurality of parts spaced apart in the circumferential direction of the base tire T, but can be formed in an annular shape that is continuous in the peripheral direction of the base tire T.

  As shown in FIG. 2, the discharge nozzle 7 has a tip 7a that presses the tire side surface to open a gap between the rim flange Ra of the integrated rim R and the bead portion Ba, and is inserted into the gap. The vulcanized foam is injected in the direction of the arrow and filled in the casing of the base tire T.

  That is, in the manufacturing method of the present invention, first, the base tire T is assembled to the integral rim R, and the discharge nozzle 7 is inserted into the gap between the bead portion Ba of the base tire T and the rim flange Ra. Unvulcanized foam is injected into the inside of the base tire T. Then, after filling with the unvulcanized foam, the discharge nozzle 7 is removed from the gap to remove the remaining unvulcanized foam between the rim flange Ra and the bead portion Ba, and the bead portion Ba is placed on the bead sheet Rs. Seat and seal. Next, the assembly of the foam tire and the rim R is obtained by heating the assembly of the base tire T and the rim R to cure and cure the unvulcanized foam filled in the tire casing.

  By configuring in this way, the tire casing T incorporated in the integrated rim R can be smoothly filled with unvulcanized foam into the tire casing, and an assembly with excellent workability. Enables the production of

  The unvulcanized foam is composed of a polymer selected from rubbers such as IR, and a foaming agent such as Cellmic H (Mitsubishi Kasei, p-toluenesulfonylhydrazine) or Cellmic K (Mitsubishi Kasei, p-toluenesulfonylacetone hydrazine). It is preferable that the viscosity of the unvulcanized foam when it is configured and injected into the tire casing from the discharge nozzle 7 is adjusted so that the minimum torque at 190 ° C. by the Mooney viscometer of JIS K6300 is 34 to 63 N · cm. By making the unvulcanized foam into a relatively high-viscosity material in this way, the bead portion Ba may be pushed to the inner side in the tire axial direction (right side in the figure) as the unvulcanized foam is injected. In order to prevent such a situation, it is preferable to employ the following method.

  That is, as shown in FIG. 2, several locking members 8 are embedded in advance on the periphery of the base tire T on the outer wall above one bead portion Ba, and the unvulcanized foam is pumped into the tire casing. During the operation, the tip of the traction member 8a is connected to the traction member 8a connected to the locking member 8 in the direction of the arrow (outer side of the tire) or to prevent the bead portion Ba from moving inward in the tire axial direction. Should be fixed.

  Further, after the unvulcanized foam is filled in the base tire T, the unvulcanized foam remaining between the rim flange Ra and the bead portion Ba is removed, and then the traction member 8a is pulled in the direction of the arrow to thereby remove the bead. The portion Ba may be seated on the bead seat Rs so that the gap between the bead portion Ba and the rim flange Ra is sealed.

  By performing such an operation, the tire tire T incorporated in the integrated rim R can be filled more smoothly with the unvulcanized foam inside the tire casing, and has excellent workability. Enables the production of solids.

  As described above, the foam-filled tire / rim assembly manufacturing apparatus 1 of the present invention includes an extruder 2 for extruding unvulcanized foam, an attachment 5 connected to the extruder 2, and a discharge nozzle 7 connected to the tip thereof. Since the unvulcanized foam is filled into the casing of the base tire T, the unvulcanized foam can be filled with a simple mechanism.

  Furthermore, by connecting the discharge nozzle 7 to the tip of the attachment 5 so as to be detachable while allowing the flow paths 6 and 4 to communicate with each other, the discharge nozzles 7 having different sizes can be freely connected. This allows filling of unvulcanized foam into various sizes of foam-filled tire / rim assemblies.

  As described above, the method and apparatus for manufacturing a foam-filled tire / rim assembly according to the present invention eliminates the manufacturing restrictions related to filling resin foam into a base tire incorporated in an integrated rim, which has been a problem in the past. However, the present invention can also be effectively applied to an assembly of a side ring type or split type rim and a foam-filled tire.

It is sectional drawing which shows the outline | summary of the manufacturing apparatus of the foam filling tire / rim assembly of this invention. It is explanatory drawing which shows the condition which is filled with the unvulcanized foam inside the tire casing of a base tire using the manufacturing apparatus of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Manufacturing apparatus 2 Extruder 3 Head 4, 6 Flow path 5 Attachment 7 Discharge nozzle 8a Pulling member T Stand tire Ba Bead part R Integrated rim Ra Rim flange Rs Bead sheet

Claims (7)

  A base tire is assembled on the integrated rim, and a discharge nozzle is inserted into the gap between the bead portion of the base tire and the rim flange of the integrated rim, and unvulcanized foam is inserted into the base tire from the discharge nozzle. A method for producing a foam-filled tire / rim assembly in which the unvulcanized foam is injected, and then the discharge nozzle is removed from the gap and sealed to cure and cure the unvulcanized foam.   The foam-filled tire / rim assembly according to claim 1, wherein the viscosity of the unvulcanized foam when injected from the discharge nozzle is a minimum torque of 34 to 63 N · cm at 190 ° C according to a Mooney viscometer of JIS K6300. Production method.   The method for manufacturing a foam-filled tire / rim assembly according to claim 1, wherein a plurality of the discharge nozzles are arranged at intervals in the circumferential direction of the base tire.   4. The foam-filled tire / rim assembly according to claim 1, wherein a traction member is connected to the bead portion, and the unvulcanized foam is injected while pulling the bead portion to the outside of the tire by the traction member. Manufacturing method.   5. The method for manufacturing a foam-filled tire / rim assembly according to claim 4, wherein after the unvulcanized foam is filled in the base tire, a gap between the bead portion and the rim flange is sealed by pulling the pulling member. .   An apparatus for carrying out the manufacturing method according to any one of claims 1 to 5, wherein an attachment for diverting a discharge flow path to a plurality of unvulcanized foam extruders is connected to each of the discharge flow paths. An apparatus for manufacturing a foam-filled tire / rim assembly equipped with the discharge nozzle so that the flow path of the discharge nozzle communicates.   A foam-filled tire / rim assembly manufactured by the manufacturing method according to claim 1.

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