JP2006240474A - Manufacturing device and method for air filling sac for safety tire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing device and a method capable of forming a hoop reinforcing layer spirally winding a resin made ribbon shape member on a crown part of a tube vulcanizingly molded with high precision and without causing sticking failure when manufacturing the air filling sac for the safety tire. <P>SOLUTION: The manufacturing device is equipped with a main molding drum 1, an auxiliary molding drum 2, and a transfer means 3. The main molding drum 1 fixes and holds the trochoid-like tube 5 having air impermeability from its inside. The main molding drum 1 has an air supply/discharge means 4 supplying/discharging the air in the tube 5. The ring-shape hoop reinforcing layer 7 is formed by spirally winding the resin-made ribbon-shape member 6 to the auxiliary molding drum 2. The outside diameter of the tube is reduced by discharging the air in the tube 5, and the hoop reinforcing layer 7 is transferred from the auxiliary molding drum 2 on the outer periphery of the main molding drum 1. The outside diameter of the tube is enlarged by supplying the air in the tube to form the air filling sac on the crown part of the tube by jointing the hoop reinforcing layer. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention includes an apparatus and a method for manufacturing a pneumatic tire tire for safety tires, and more specifically, a hoop reinforcing layer formed by spirally winding a resin ribbon-like member around a crown portion of an air-impermeable tube. In particular, the present invention relates to a production apparatus and a production method for an air bladder to prevent the occurrence of defective pasting of the hoop reinforcing layer.

  Reinforcing members such as reinforcing tubes, reinforcing rubbers, and reinforcing belts, or foams, elastic bodies, In recent years, tires containing a child or the like have been known, and in recent years, from the viewpoint of suppressing manufacturing cost and weight increase, the tires are housed inside a safety tire and in a run-flat state where the internal pressure of the tire is reduced, A safety tire that accommodates a hollow tubular air bladder that expands and deforms as the internal pressure decreases and replaces the load from the tire is becoming widespread (see, for example, Patent Document 1).

  In such an air bladder-containing safety tire, the internal pressure of the air bladder is generally higher than the internal pressure of the tire in order to rapidly expand and deform the air bladder when the internal pressure decreases. However, when the centrifugal force due to the rolling of the tire acts in addition to this internal pressure difference, the air bladder expands and reaches the inner surface of the tire, and there is a risk that the durability is lowered by rubbing against the inner surface of the tire. For this reason, in a pneumatic tire-containing safety tire, a crown hoop reinforcement layer made of a rubber covering of a cord or a nonwoven fabric / rubber composite is provided at the crown to increase the rigidity of the crown. Prevents expansion deformation during internal pressure. However, when such a hoop reinforcing layer is used for a long period of time, the rubber portion creeps and grows in diameter, and eventually reaches the inner surface of the tire. In order to suppress this, a hoop reinforcing layer must be formed of a plurality of coverings or composites, which has a problem of increasing the weight of the safety tire.

  Although it is conceivable to use a resin to reduce the weight of the hoop reinforcement layer, the inner diameter of the hoop reinforcement layer is substantially the same as the outer diameter of the tube, and the hoop reinforcement layer made of resin hardly expands. It is difficult to apply the layer on the tube. It is also possible to form a hoop reinforcement layer by spirally winding a ribbon-shaped resin around the outer surface of a tube expanded by applying air pressure. However, a tube using air pressure is flexible and easily deformed, with high accuracy. In addition, it is difficult to apply the hoop reinforcement layer, and there is a limit to the tension that can be applied to the hoop reinforcement layer during application. There is a concern that peeling or misalignment may occur.

JP 2004-90808 A

  Accordingly, the object of the present invention is to provide a high-precision hoop reinforcement layer formed by spirally winding a resin ribbon-like member around the crown portion of a vulcanized tube in the production of a safety tire pneumatic bladder. It is an object of the present invention to provide a manufacturing apparatus and a manufacturing method that can be formed without causing poor attachment.

  In order to achieve the above object, an apparatus for producing a pneumatic tire pouch for a safety tire according to the present invention fixes and holds an air-impermeable toroidal tube from the inside and supplies and discharges air in the tube. A main molding drum having an exhaust means, an auxiliary molding drum that forms a ring-shaped hoop reinforcement layer by spirally winding a resin ribbon-like member, and a hoop reinforcement layer formed on the auxiliary molding drum include the main molding drum It has a transfer means for transferring on the outer periphery of the drum.

  Moreover, it is preferable that the air supply / exhaust means has an air supply / exhaust valve provided at least on a side surface and inserted into a valve stem provided in the tube.

  Furthermore, it is preferable to further include means for controlling the tension of the ribbon-like member wound around the auxiliary molding drum.

  The method for producing a pneumatic tire for a safety tire according to the present invention includes a step of fixing and holding an air-impermeable toroidal tube on a main molding drum, and discharging the air in the tube to remove the tube from the tube. A step of reducing the diameter, a step of spirally winding a resin ribbon-like member on the auxiliary molding drum to form a ring-shaped hoop reinforcement layer, and the outer periphery of the tube from the auxiliary molding drum to the hoop reinforcement layer And a step of supplying air into the tube to increase the outer diameter of the tube and joining a hoop reinforcing layer to the crown portion of the tube to form an air bladder. To do.

  In addition, it is preferable to supply and exhaust the tube through an air supply / exhaust unit having a supply / exhaust valve provided at least on the side surface and having a supply / discharge valve inserted into a valve stem provided in the tube.

  Furthermore, it is preferable that the ribbon-shaped member is spirally wound around the auxiliary molding drum while being held at a predetermined tension.

  In addition, it is preferable that the ribbon-shaped member is spirally wound in a state where a bonding layer is provided on at least one of the inner surface of the ribbon-shaped member and the outer surface of the auxiliary molding drum.

  According to the present invention, since the hoop reinforcement layer is formed on the drum, the dimensional accuracy of the hoop reinforcement layer is improved, and the unexpanded hoop reinforcement layer is formed with high accuracy and without causing poor adhesion. It is possible to provide a manufacturing apparatus and a manufacturing method that can be used.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic cross-sectional view of a representative device for producing a pneumatic tire for a safety tire according to the present invention. FIGS. 2 to 7 show a process for producing a pneumatic tire for a safety tire using the device shown in FIG. It is a schematic sectional drawing for demonstrating, FIG. 8 is a side view of a supply / discharge valve.

  The safety tire pneumatic apparatus shown in FIG. 1 includes a main molding drum 1, an auxiliary molding drum 2, and a transfer means 3. The main molding drum 1 is provided with an air supply / exhaust means 4, and this air supply / exhaust means 4 includes an apparatus capable of supplying and discharging air such as a vacuum pump and a compressor, although not shown. Furthermore, although not shown, the transfer means 3 includes a holding means such as an air chuck that detachably holds the hoop reinforcing layer.

  Next, a method for manufacturing an air bladder using the manufacturing apparatus configured as described above will be described. First, as shown in FIG. 2, an air-impermeable toroidal tube 5 serving as a base for an air bladder is attached to the main molding drum 1, and fixed and held from the inside. The tube 5 can be configured in the same manner as that used for tube tire tubes and conventional air bladders, and may be either vulcanized or unvulcanized, but the heat resistance of the hoop reinforcement layer. If it is low, it is preferable to use a vulcanized one. The tube 5 is fixed in such a manner that it can be expanded or contracted in the radial direction by expanding at least a part of the segment of the main molding drum 1. After the tube 5 is attached in a reduced diameter state, it is substantially the same as the inner diameter of the tube 5. This can be done by expanding the diameter until they are the same. As shown in FIG. 3, a resin-made ribbon-like member 6 made of resin is spirally wound around the auxiliary molding drum 2, and has an inner diameter that is substantially the same as the outer diameter of the tube 5 in a state where a predetermined air pressure is applied. A ring-shaped hoop reinforcing layer 7 is formed. On the other hand, the tube 5 fixedly held on the main molding drum 1 discharges the air inside thereof by the air supply / exhaust means 4 to reduce the outer diameter. Next, as shown in FIG. 4, the transfer means 3 is moved to the position of the auxiliary molding drum 2 to hold the hoop reinforcing layer 7. In this state, the transfer means 3 is moved, the hoop reinforcing layer 7 is removed from the auxiliary molding drum 2 as shown in FIG. 5, and the movement is continued until the position of the main molding drum 1 is reached as shown in FIG. Then, as shown in FIG. 7, with the hoop reinforcing layer 7 positioned on the outer periphery of the tube 5, the air supply / exhaust means 4 supplies air into the tube 5 to expand the outer diameter of the tube 5. The hoop reinforcement layer 7 is joined to the crown portion of the air to form an air bladder.

  By forming an air bladder in this way, a ribbon-shaped member is spirally wound not on an unstable tube but on a stable auxiliary molding drum, thus forming a hoop reinforcement layer with high dimensional accuracy. can do. Moreover, even if a high tension is applied during the spiral winding of the ribbon-shaped member, the auxiliary molding drum is not deformed, so that the ribbon-shaped members can be firmly joined to each other. Further, the formed hoop reinforcing layer is substantially the same as the outer diameter of the tube in a state where a predetermined air pressure is applied, but after the air in the tube is discharged by the air supply / exhaust means to reduce the outer diameter of the tube. Since the hoop reinforcing layer is applied on the tube, the hoop reinforcing layer and the tube can be easily joined.

  Further, the air supply / exhaust means 4 preferably has a supply / exhaust valve 8 having a side surface shape shown in FIG. The supply / discharge valve 8 has a supply / discharge port 9 on at least a side surface, and is inserted into a valve stem provided in the tube. The supply / exhaust valve 8 is connected to a device that enables air supply / exhaust such as a vacuum pump and a compressor (not shown) of the supply / exhaust means 4, and supplies the air in the tube through the supply / exhaust port 6 by these devices. Exclude.

  The operation of this supply / discharge valve will be described with reference to FIG. FIGS. 9A and 9B are cross-sectional views showing a state in which the supply / discharge valve is inserted into the valve stem 10 provided in the tube 5, and the supply / discharge valve 11 of FIG. The supply / discharge port 9 is provided, and the supply / discharge valve 8 in FIG. 9B has the supply / discharge port 9 on the side surface. When the internal air is discharged by the air supply / exhaust means and the internal pressure is reduced, the portion of the tube 5 facing the valve stem 10 bends and finally comes into contact with the air supply / discharge valve. In the supply / exhaust valve 11 shown in FIG. 9 (a), the bent tube closes the supply / exhaust port 9, and no further exhaust can be performed. There is. On the other hand, in the supply / discharge valve 8 shown in FIG. 9B, the supply / discharge port 9 is not blocked even if the tube 5 bends and contacts the supply / discharge valve 8. It is possible to exhaust almost all of the air. In addition, although the aspect which provides a supply / exhaust port only in the side surface was shown in FIG.8 and FIG.9 (b), you may have a supply / exhaust port in an upper surface.

  Further, when the ribbon-like member is spirally wound around the auxiliary molding drum, the tension applied to the ribbon-like member by the means for controlling the tension, such as a servo motor synchronous tension control device or a permanent torque type tension control device, is made constant. It is preferable to hold it. If the tension fluctuates during the formation of the hoop reinforcement layer, the dimensional accuracy will deteriorate, the bonding between the ribbon-like members will be defective, or the stress-strain characteristics of the hoop reinforcement layer will deviate greatly from the design value, resulting in defective products. Because there is a case to do.

  The bonding between the ribbon-like members and the bonding between the hoop reinforcing layer and the tube can be performed by various means. For example, a liquid adhesive is used, and for bonding the ribbon-shaped members, an adhesive is applied to the outer surface of the ribbon-shaped member 6 wound on the auxiliary molding drum 2, and then the ribbon-shaped member 6 is placed thereon. For winding and joining the hoop reinforcing layer and the tube, after applying an adhesive to the outer surface of the tube, air can be supplied to the tube to increase the outer diameter. However, from the viewpoint of improving workability, it is preferable to spirally wind the ribbon-like member around the auxiliary molding drum in a state in which a bonding layer is provided in advance. In this case, the joining layer where the ribbon-like member overlaps contributes to joining the ribbon-like members, and the joining layer where the ribbon-like member does not overlap contributes to joining the hoop reinforcing layer and the tube. Alternatively, the ribbon-shaped member can be spirally wound in a state in which a bonding layer is previously provided on the outer surface of the auxiliary molding drum. In this case, all of the joining layers contribute to both the joining of the ribbon-like members and the joining of the hoop reinforcing layer and the tube.

  A double-sided tape, an adhesive, or the like can be used for the bonding layer. When an unvulcanized tube is used, a vulcanized adhesive can also be used. Further, in order to easily remove the hoop reinforcing layer 7 from the auxiliary molding drum 2, a release paper is wound around the outer surface of the auxiliary molding drum 2, and an adhesive layer is applied on the release paper, or an adhesive layer is provided on the inner surface. It is preferable that the ribbon-shaped member is spirally wound or a surface treatment is performed on the outer surface of the auxiliary molding drum 2 to improve the releasability.

  The ribbon-like member can be configured using various resins that satisfy the characteristics required for the hoop reinforcing layer such as rigidity, heat resistance, and creep resistance. Particularly preferred resins are polyethylene terephthalate, polypropylene, and blended resins thereof.

  In addition, the place mentioned above only showed a part of embodiment of this invention, and can change a various change in a claim. For example, in FIGS. 1 to 7, the central axes of the main molding drum 1 and the auxiliary molding drum 2 coincide with each other, and the mode in which the transfer means 3 moves linearly between these is shown. May be parallel or crossed, and various layouts can be adopted. Further, the transfer means 3 is not limited to one that moves linearly, and for example, a robot can be used. Furthermore, a hoop reinforcement layer in which a single wide sheet-like member is formed in a ring shape can be used instead of the hoop reinforcement layer in which a narrow ribbon-like member is spirally wound.

  As is clear from the above description, the present invention forms the hoop reinforcement layer on the drum, so that the dimensional accuracy of the hoop reinforcement layer is improved and the unexpanded hoop reinforcement layer is attached with high accuracy. It has become possible to provide a manufacturing apparatus and a manufacturing method that can be formed without causing defects.

It is a schematic sectional drawing of the manufacturing apparatus of the typical pneumatic tire for safety tires according to this invention. It is a schematic sectional drawing for demonstrating the process of manufacturing the air bladder for safety tires using the apparatus shown in FIG. It is a schematic sectional drawing for demonstrating the process of manufacturing the air bladder for safety tires using the apparatus shown in FIG. It is a schematic sectional drawing for demonstrating the process of manufacturing the air bladder for safety tires using the apparatus shown in FIG. It is a schematic sectional drawing for demonstrating the process of manufacturing the air bladder for safety tires using the apparatus shown in FIG. It is a schematic sectional drawing for demonstrating the process of manufacturing the air bladder for safety tires using the apparatus shown in FIG. It is a schematic sectional drawing for demonstrating the process of manufacturing the air bladder for safety tires using the apparatus shown in FIG. It is a side view of a supply / discharge valve. (A) is sectional drawing which shows the state which inserted the conventional supply / discharge valve in the valve stem provided in the tube, (b) is inserted in the valve stem provided in the tube, according to this invention It is sectional drawing which shows the state which carried out.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main molding drum 2 Auxiliary molding drum 3 Transfer means 4 Supply / exhaust means 5 Tube 6 Ribbon-shaped member 7 Hoop reinforcement layer 8 Supply / exhaust valve 9 Supply / exhaust port of supply / exhaust valve 10 Valve stem

Claims (7)

  An air-impermeable toroidal tube is fixed and held from the inside, and a main molding drum having air supply / exhaust means for supplying and exhausting air in the tube and a ribbon-shaped member made of resin are spirally wound to form a ring shape An auxiliary molding drum for forming a hoop reinforcing layer, and a transfer means for transferring the hoop reinforcing layer formed on the auxiliary molding drum onto the outer periphery of the main molding drum, Sea urchin production equipment.   2. The manufacturing apparatus according to claim 1, wherein the air supply / exhaust means includes a supply / discharge valve that is provided with a supply / discharge port on at least a side surface thereof and is inserted into a valve stem provided in a tube.   The manufacturing apparatus according to claim 1, further comprising means for controlling a tension of a ribbon-like member wound around the auxiliary molding drum. Fixing and holding an air-impermeable toroidal tube on the main molding drum;
Discharging the air in the tube to reduce the outer diameter of the tube;
A step of spirally winding a resin ribbon-like member on an auxiliary molding drum to form a ring-shaped hoop reinforcing layer;
Transferring the hoop reinforcing layer from the auxiliary molding drum onto the outer periphery of the tube;
A step of supplying air into the tube to expand the outer diameter of the tube, and joining a hoop reinforcing layer to the crown portion of the tube to form an air bladder. Manufacturing method.   The manufacturing method according to claim 4, wherein the tube is supplied / exhausted through an air supply / exhaust means having a supply / exhaust valve inserted into a valve stem provided in the tube, having a supply / exhaust port at least on a side surface.   The manufacturing method according to claim 4 or 5, wherein the ribbon-shaped member is spirally wound around an auxiliary molding drum while being held at a predetermined tension. The manufacturing method as described in any one of Claims 4-6 which spirally winds a ribbon-shaped member in the state which provided the joining layer in at least one of the inner surface of a ribbon-shaped member, and the outer surface of an auxiliary molding drum.

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