JP4667199B2 - Method and vulcanization mold for air bladder for safety tire - Google Patents

Description

  The present invention relates to a method for vulcanizing an air bladder for a safety tire, comprising an annular hollow body that is housed and arranged inside a tire, is assembled to a rim together with the tire, and is in surface contact with the rim on the inner peripheral surface, and the method In particular, the air bladder after vulcanization molding is sufficiently smooth from the vulcanization mold without the occurrence of large deformation or damage to the air bladder after the vulcanization molding is completed. And it proposes the technology that can be taken out reliably.

  Various types of air bladders for safety tires that are assembled to the rim together with the tire and expand and deform as the tire pressure decreases due to tire puncture, etc., functioning to support the load from the tire shoulder Things have been proposed.

  Among these, in recent air bladders, for example, a reinforcing layer made of a nonwoven fabric or the like is disposed on the entire inner peripheral portion and outer peripheral portion of a tire tube-like hollow support that forms an annular shape. In order to ensure reliable seating of the rim at a predetermined position, a pair of bead core-like core members are continuously arranged in the circumferential direction at intervals in the central axis direction of the air bladder. According to this, the air bladder becomes an outer peripheral side portion of the air bladder, and not only the area that supports the filling internal pressure there, but also the surface contact with the rim during use. Even in the inner peripheral region, the rigidity is considerably large.

  By the way, such an air bladder is formed in the direction of the central axis CL of a vulcanization mold whose half is illustrated in a radial sectional view in FIG. In the case of manufacturing by vulcanizing and molding an unvulcanized air bladder with a vulcanizing mold M that is divided and paired vertically in the figure, in particular, the unvulcanized air is placed at a predetermined position of the lower mold L. As shown in the figure, in order to remove the possibility of unvulcanized air trapped between both molds when the upper mold U is clamped with respect to the lower mold L in a state where the tank is positioned and arranged. When the split position of the partition part IP on the inner peripheral surface of the cavity C is positioned close to the upper end of the cavity C, the product is obtained by vulcanizing and molding unvulcanized air in the cavity C. Removing Pneumatic AC from vulcanization mold M For example, when the upper mold U is in an open state, the upward extraction of the air bladder AC from the lower mold L results in the air bladder AC and the lower mold L, in particular, the inner peripheral surface section IP. In order to make full use of the functions as expected for airborne AC, it is necessary to increase the size of the reinforcing layer made of airpowder AC and eventually non-woven fabric. Since it cannot be deformed, there is a problem that it is very difficult to take it out from the vulcanization mold M.

  In addition, recently, in order to facilitate the flow of the filling gas in the tire passing between the air rim which is assembled to the rim together with the tire and is in surface contact with the rim on the inner peripheral surface, for example, JP As disclosed in Japanese Patent Application Publication No. 2003-146031 and International Publication No. 04/106092 pamphlet, etc., it has been proposed to form an uneven portion in the rubber layer disposed in the inner peripheral region of the air bladder. In the case where the air bladder having such uneven portions is taken out from the vulcanization mold as described above, regardless of whether the extending direction of the uneven portions intersects the central axis of the cavity. There is a problem that it is more difficult to take out the convex portion of the air bag because it is fitted into the concave portion of the vulcanization mold.

  An object of the present invention is to solve such problems of the prior art, and an object of the invention is to provide an uneven portion on the contact surface of the inner surface of the air bladder with the rim. Provided is a method for vulcanizing a safety tire for an air bladder that has been formed and yet smoothly and easily removed from the vulcanization mold, and a vulcanization mold for use in the implementation of the method. It is in.

  According to the present invention, a method for vulcanizing a pneumatic tire for a safety tire is formed by vulcanization molding in a vulcanization mold, housed and disposed inside the tire, assembled to the rim together with the tire, and rim on the inner peripheral surface. The vulcanization mold that contributed to the formation of irregularities on the inner circumferential surface of the air bladder prior to taking out the air bladder made of an annular hollow body for safety tires in surface contact with the vulcanization mold The contact area with the inner peripheral surface of the air bladder is displaced to the inside in the radial direction over the entire circumference, in other words, the diameter is reduced.

  In this case, preferably, the entire vulcanization mold portion contributing to the vulcanization molding of the contact area with the rim of the inner peripheral surface of the air bladder is displaced inward in the radial direction.

  A pneumatic tire vulcanization mold for a safety tire according to the present invention is an annular hollow for a safety tire having an uneven portion in a contact area with a rim of an inner peripheral surface in a cavity that is airtightly partitioned. Vulcanizing and molding an air bladder made of a body, in contact with the inner peripheral surface of an unvulcanized air bladder, and forming a concavo-convex portion that comes into contact with the rim, and vulcanizing The inner mold part to be applied is composed of a plurality of circumferentially divided members, and each of these divided parts can be displaced inward and outward in the radial direction.

  Here, preferably, the inner peripheral mold part is disposed on the inner peripheral surface of the unvulcanized air bladder over the entire mold part for vulcanization molding of the contact area with the rim.

  Preferably, the inner peripheral mold part is positioned, for example, vertically and displaced in a direction approaching and separating from each other to form an uneven portion on each side of the unvulcanized air bladder. Each side mold part to be vulcanized is provided.

  In the method according to the present invention, when an unvulcanized air bladder is vulcanized and molded into a product air bladder in the cavity of the vulcanization mold, the air bladder is removed before the air bladder is taken out from the vulcanization mold. By changing the diameter of the contact area of the vulcanization mold, which has irregularities on the contact surface with the rim, on the inner peripheral surface of the urine, and reducing the diameter of the contact area to the inner peripheral surface of the air urine, Because the restraint on the inner surface of the air bladder, in particular, the uneven portion thereof, can be sufficiently removed in advance, the inner peripheral portion of the air bladder is not subject to high rigidity. Regardless of whether or not the contact area between the contact area of the sulfur mold and the inner peripheral surface of the air bladder is large, the air bladder having an uneven portion on the inner peripheral surface causes a large deformation in itself. Without the use, i.e. the permanent layer placed on the air bladder Without leaving strain etc., and without causing damage or the like to the uneven portion of it, sufficiently smoothly and easily, moreover, can be removed from the always proper vulcanization mold.

  And this contributes to the vulcanization molding of the contact area with the rim of the inner peripheral surface of the air bladder, regardless of whether or not it is a portion that contributes to the formation of the uneven portion on the inner peripheral surface of the air bladder. The entire mold part is reduced in diameter, in other words, even if it is a mold part that performs vulcanization molding of the inner surface of the air bladder, the diameter reduction including the mold part that does not contribute to the formation of uneven parts. It is more effective when it is displaced and the restraint of the vulcanization mold on the inner peripheral surface of the air bladder is removed sufficiently.

  Moreover, in the vulcanization mold according to the present invention, the inner peripheral side mold portion that contacts the inner peripheral surface of the unvulcanized air bladder and forms the uneven portion is divided into a plurality of circumferentially divided members. In the inner periphery side, each of the divided members can be displaced inward and outward in the radial direction, and the adjacent divided members closely contact each other by the displacement of the divided members outward in the radial direction. While the working posture of the mold part is set to the reduced-diameter posture in which each divided member escapes from the vulcanized product air bag due to the radially inward displacement of the divided member, The vulcanization method can always be carried out reliably and simply as expected.

  In such a vulcanization mold, an inner peripheral side mold portion composed of a plurality of divided members is disposed on the inner peripheral surface of an unvulcanized air bladder over the entire mold portion for vulcanization molding of the contact area with the rim. In this case, as described above, the same effect as that when the entire mold portion contributing to the vulcanization molding of the inner peripheral surface of the air bladder in the contact area with the rim is reduced in diameter is brought about. On the other hand, when the concave and convex portions are also formed in the respective side regions adjacent to both sides of the inner peripheral surface of the air bag and not in contact with the rim, the concave and convex portions are formed on the inner peripheral side mold. By forming it in a mold part that is separate from the part, it is possible to sufficiently eliminate the possibility of damage to the air grooving uneven part in the side area when the reduced diameter displacement of the split member of the inner peripheral side mold part is performed. Can do.

  By the way, when forming irregularities in each side area adjacent to both sides of the inner peripheral surface of the air bladder and not in contact with the rim, the inner peripheral mold part is positioned with the vertical direction spaced apart. Side mold parts which can be moved toward and away from each other in the direction of the central axis of the cavity and form concavo-convex parts on the respective sides of the unvulcanized air bladder, for example, upper mold part and lower mold It is preferable to provide a portion, and according to this, it is possible to sufficiently eliminate the possibility of damage to the concavo-convex portion formed in the side region of the product air bladder when the vulcanization mold is opened.

FIG. 1 is a schematic perspective view showing an embodiment of a vulcanization mold according to the present invention with respect to its main part. This is a vulcanization mold having a vertically divided structure as described in the prior art. The lower mold is shown.
In addition, the upper mold | type shown with a virtual line in a figure becomes the rotary body structure of the radial direction cross-section shown in FIG. 10, and makes the whole structure integrally.

  A vulcanized molded body in which an unvulcanized air bladder filled with a predetermined internal pressure is flattened in a cavity that is hermetically partitioned, for example, the outer contour shape in the radial cross section is flat in the radial direction. The lower mold 2 of the vulcanization mold 1 as a product air is provided with an annular groove 4 that contributes to an airtight cavity partition in cooperation with the upper mold 3. Positioned adjacent to the peripheral side, in contact with the inner peripheral surface of the unvulcanized air bladder and positioned adjacent to the outer peripheral side of the annular groove 4 and the inner peripheral side mold part 5 for performing vulcanization molding there. And an outer peripheral side mold part 6 for contacting the outer peripheral surface of the unvulcanized air bladder and subjecting it to vulcanization molding, wherein the inner peripheral side mold part 5 is as described in the prior art. In addition, the upper and lower surfaces of the upper mold 3 are hermetically contacted at a level considerably higher than the outer mold part 6. With a split position.

  In such a lower mold 2, here, the inner periphery side mold portion 5 is divided into a plurality of members divided in the circumferential direction. In the example illustrated in FIG. A total of six divided members 7a and 7b are configured, and each of the divided members 7a and 7b can be displaced in and out of the radial direction as required.

  In addition, when the inner peripheral side mold part 5 is constituted by two kinds of large and small divided members 7a and 7b as described above, each of the divided members 7a and 7b is shown in a schematic plan view in FIG. As shown, from the action posture of the inner peripheral side mold part 5 in which the individual members are in the radially outward limit position and the adjacent divided members 7a and 7b are aligned without gaps in the circumferential direction, When setting the inactive posture of the inner peripheral mold part 5 in which both the dividing members 7a and 7b are displaced inward in the radial direction, first, the circumferential length in plan view is outward in the radial direction. Each of the small divided members 7b that gradually decreases toward the inside or becomes constant inside and outside in the radial direction is displaced inward in the radial direction as shown in FIG. 2 (b), and then the large divided members for convenience. 7a to the inside in the radial direction As indicated by the phantom line, it is necessary to displace them. This is the same regardless of the number of divisions when the large and small divided members 7a and 7b are both equal in number. is there.

  On the other hand, when the inner peripheral side mold portion 5 in the non-acting posture is set to the working posture in which each of the divided members 7a and 7b has advanced to the advance limit position radially outward, first, the large divided member 7a. Then, the small dividing member 7b is moved forward and displaced so that the adjacent dividing members 7a and 7b are in close contact with each other without any gap, and this addition shown in the figure is a two-part structure in the vertical direction. In the sulfur mold 1, the lower mold 2 and the upper mold 3 are displaced relative to each other in the vertical direction under such an action posture of the inner peripheral mold portion 5, thereby being partitioned by the molds 2 and 3. The cavity can be opened and closed as required.

  By the way, the inner peripheral side mold part 5 as described above is in contact with the inner peripheral surface of the unvulcanized air bladder on the outer peripheral surface as shown in FIGS. A plurality of concave portions 8 and convex portions 9 forming a portion are provided at respective required pitches in the height direction and the circumferential direction, and the inner peripheral mold portion 5 is arranged in the vertical direction in FIG. It is preferable that the installation area is the entire mold part for vulcanization molding the contact area of the product air bladder with the rim on the inner peripheral surface of the unvulcanized air bladder.

  As shown in FIG. 3 showing a radial sectional view when the product air bladder is assembled to the rim, the arrangement area of the inner peripheral mold portion 5 is the same as that of the inner peripheral surface of the air bladder 10. The contact area CR with the rim 11 is preferably within a range where the entire vulcanization molding can be performed, and according to this, all or a part of the contact area CR vulcanized and molded by the inner peripheral mold portion 5 is obtained. For example, an uneven portion based on the action of the concave portion 8 and the convex portion 9 of the mold portion 5 can be formed on the entire portion, and these uneven portions are virtually illustrated in the figure between the air bladder 10 and the rim 11. The flow path which permits the flow of the gas with which it filled between the tire 12 assembled | attached to the rim | limb and the air bladder 10 shown with a line is divided.

  Here, when such a flow of the gas filled in the tire along the rim 11 is allowed, the filled gas heated by the load rolling of the tire 12 is cooled through the heat radiation action of the rim 11. In addition, the temperature, pressure and the like of the filling gas can be accurately detected by the sensor 13 attached to the rim 11.

  In the rim assembly structure shown in FIG. 3, the air bladder 10 is brought into surface contact not only with the rim 11 but also with the inner surface of the bead portion 12a of the tire 12 assembled to the rim. In order to make the flow of the filling gas into the interior sufficiently smooth as described above, not only the contact area CR of the air bladder 10 with the rim 11 but also adjacent to both sides of the contact area CR. It is necessary to form an uneven part also in the contact area CB with the bead part 12a.

  Therefore, in the illustrated vulcanization mold 1, in order to be able to cope with such a rim assembly structure of the air bladder 10 and the tire 12, that is, in addition to the contact region CR of the air bladder 10 with the rim 11. In order to form a concavo-convex portion also in the contact region CB with the tire bead portion 12a, for example, as shown in FIG. 4, a radial cross section along line IV-IV in FIG. The concave portion 8 and the convex portion 9 as described above are provided on the outer peripheral surface of the peripheral mold portion 5, and the annular groove 4 of the lower mold 2 and the annular groove 4 are opposed to each other. The concave portions 16 and the convex portions 17 are arranged at a required pitch on the entire groove bottom portion of each of the similar annular grooves 15 of the upper mold 3 that contribute to the above, and the cross-sectional shapes of which are both curved.

  Here, the formation range of the uneven portion on each side portion adjacent to the rim contact region CR of the air bladder 10 is the minimum necessary to actually contact the inner surface of the tire bead portion 12a. In other words, when the contact region CB shown in FIG. 3 is used, the arrangement area of the concave portion 16 and the convex portion 17 into the annular grooves 4 and 15 shown in FIG. It can be almost half of the mold portion 5.

  When the vulcanized mold as described above is used and vulcanized molding is performed on the unvulcanized air balloon to obtain a predetermined product air balloon, first, the inside of the unvulcanized air balloon of the lower mold 2 is used. As shown in the radial cross-sectional view of FIG. 5 (a), the inner peripheral side mold portion 5 as a contact area with the peripheral surface and the respective divided members 7a and 7b constituting the inner peripheral mold portion are shown in the radial direction. The inner peripheral side of the mold part 5 is effectively displaced from the risk of contact with the unvulcanized air bladder T and then filled with some internal pressure. The unvulcanized air bladder T is positioned and arranged at a predetermined position corresponding to the annular groove 4 of the lower mold 2.

  After properly arranging the unvulcanized air bladder T in the intended position in this way, the respective divided members 7a and 7b of the inner peripheral mold part 5 are shown in FIG. 5 (b). As shown in FIG. 5 (c), the upper die 3 is lowered to advance to the advance limit position radially outward to contribute to the partition of the cavity 14, and the die of the vulcanizing mold 1 In this way, the unvulcanized air bladder T is contained in the cavity 14 which is airtightly divided by these, and the unvulcanized air bladder T is supplied based on the supply of a predetermined internal pressure to the unvulcanized air bladder T. The air bladder T is brought into contact with the cavity wall surface including the outer peripheral surface of the inner peripheral mold portion 5 with a required force.

  Accordingly, in such a state that the unvulcanized air bladder T is contained, the unvulcanized air bladder T is heated by both the upper and lower molds 3 and 2 so that the unvulcanized air bladder T is converted into the cavity 14. The product can be molded into a corresponding shape and vulcanized to form a desired product air bladder. In the contact region CR of the air bladder 10 with the rim 11, the outer peripheral surface of the inner peripheral mold portion 5 is formed. The concave and convex portions 8 and the convex portions 9 and the side portions adjacent to the contact region CR are formed with the necessary concave and convex portions by the concave portions 16 and the convex portions 17 provided in the respective annular grooves 4 and 10. be able to.

The removal of the air bladder constructed as described above from the vulcanization mold follows, for example, the reverse process described with reference to FIG. Then, the vulcanization mold 1 is opened, and then the divided members 7a and 7b of the inner peripheral side mold portion 5 are displaced inward in the radial direction to cause the diameter reduction deformation of the mold portion 5, and By extracting the air bladder 10 on the mold 2 upward, the rim contact area CR of the air bladder 10 and the uneven portions formed on the respective side portions of the contact area CR are added. Sufficiently smooth and easy without interfering with each of the concave portions 8 and 16 and the convex portions 9 and 17 on the sulfur mold side, and without giving the air bladder 10 large deformation that causes permanent distortion. Can be die-cut The air bladder 10 thus taken out from the vulcanization mold 1 is adjacent to the rim contact region CR and both sides of the region CR, as illustrated in the schematic cross-sectional view in the radial direction in FIG. Nearly the entire side regions S have the convex portions 18 and the concave portions 19 that remain appropriately without being damaged.
This is the same regardless of whether the rigidity of the inner peripheral region of the air bladder 10 is high.

  Therefore, when the air bladder 10 is vulcanized and molded in accordance with the method according to the present invention using the vulcanization mold as described above, in particular, the inner peripheral surface of the air bladder 10 is connected to the rim 11. Convex recesses 18 and 19 are formed in the contact region CR, and the air bladder 10 is vulcanized based on the reduced diameter deformation of the inner peripheral mold part 5 provided with the recesses 8 and the protrusions 9 on the outer peripheral surface. The mold 1 can be always taken out properly and smoothly and easily, and the convex and concave portions 18 and 19 of the air bladder 10 can be effectively protected from damage caused by die cutting.

FIG. 7 is a schematic half sectional view and a plan view in the radial direction showing another embodiment of the vulcanization mold.
This is because the vulcanization mold 21 that contributes to the section of the cavity is subjected to vulcanization molding on the entire inner peripheral side portion of the unvulcanized air bag, and the unvulcanized air. The outer peripheral side vulcanization molding portion 23 that performs vulcanization molding on the entire outer peripheral side portion of the shell and the entire inner peripheral side vulcanization molding portion 22 are the same as the inner peripheral side mold portion 5 described above. In addition, a plurality of divided members in the circumferential direction, for example, a total of six divided members 24a and 24b of two kinds of large and small, and the whole outer peripheral side vulcanization forming part 23 are also divided into two kinds of large and small, Each of the divided members 24a, 24b, 25a, and 25b is configured to be displaceable inward and outward in the radial direction as required, and the inner peripheral side vulcanization molding. The rim 11 on the inner peripheral surface of the product air bladder 10 is formed on the outer peripheral surface of the portion 22. It is obtained by arranging the respective recesses 26 and protrusions 27 functions to only form a concave-convex portions 18 and 19 contact region CR.

  Here, in the same manner as described for the inner peripheral side mold portion 5, the subdivided portion 24 b for convenience of the inner peripheral side vulcanization molding portion 22 gradually decreases in the circumferential direction in a plan view toward the outer side in the radial direction. Alternatively, the subdivided member 25b for convenience of the outer peripheral side vulcanization molding portion 23 has a dimension in which the circumferential length is constant inside and outside in the radial direction. It has a dimensional form that gradually increases inward or constant inward and outward in the radial direction.

  Therefore, the inner peripheral side vulcanization molded portion of the vulcanization mold 21 as shown in FIG. 7 (b), in which the respective divided members 24a, 24b and 25a, 25b adjacent to each other are in close contact with each other without a gap, is used. 22 is moved radially inward, and the outer peripheral side vulcanized molded portion 23 is displaced radially outward and the mold is opened, the inner peripheral vulcanized molded portion 22 is small. Displacement in the radially inward direction of the dividing member 24b and displacement inward in the radially inward direction of the large dividing member 24a are sequentially performed. The cavity 28 defined by the two vulcanization molded portions 22 and 23 is widely opened by sequentially performing the radially outward displacement and the radially outward displacement of the large dividing member 25a. be able to.

  For this reason, it is possible to easily and surely perform proper positioning and arrangement of the unvulcanized air to the vulcanization mold, and the air bladder 10 in which the convex recesses 18 and 19 are formed. The removal from the vulcanization mold 21 can be easily performed without damaging the air bladder 10, particularly the convex and concave portions 18 and 19 thereof.

  In addition, in the place shown in FIG. 7, although the whole inner peripheral side vulcanization molding part 22 and the outer peripheral side vulcanization molding part 23 are divided in the circumferential direction, only a part of each of these vulcanization molding parts is divided. FIG. 8 is a schematic half-line cross-sectional view in the radial direction, showing an example of the structure.

  The vulcanization mold 31 shown in FIG. 8 contributes to the lower mold part 34 provided with the annular groove 33 that contributes to the bottom section of the cavity 32, and the remaining section of the cavity 32, so An inner peripheral side vulcanization molding portion 35 that performs vulcanization molding on most of the inner peripheral side portion, and an outer peripheral side vulcanization molding portion 36 that performs vulcanization molding on most of the outer peripheral side portion of the unvulcanized air bladder. The inner peripheral vulcanization molded portion 35 has a divided structure similar to the inner peripheral vulcanized molded portion 22 shown in FIG. 7, and the outer peripheral vulcanized molded portion 36 is 7 has the same divided structure as that of the outer peripheral side vulcanization molded portion 23 shown in FIG. 7 and, at the same time, the inner peripheral side vulcanized molded portion 22 of FIG. Each of the concave portion 37 and the convex portion 38 functioning in the above is disposed.

  In this vulcanization mold 31, the respective divided members of the inner peripheral side vulcanization molded portion 35 are displaced and displaced inward in the radial direction from mutual contact postures as shown in the figure, and the outer peripheral vulcanization molded portion The cavities 32 can be largely opened in the same manner as the vulcanization mold 21 shown in FIG.

  Further, another vulcanization mold 41 shown in FIG. 9 includes upper and lower mold parts 42 and 43, an inner peripheral side vulcanization molding part 44 and an outer peripheral side vulcanization molding part 45. The mold portions 42 and 43 can be relatively displaced in the vertical direction, and the inner peripheral side vulcanized molded portion 44 and the outer peripheral side vulcanized molded portion 45 are respectively connected to the inner peripheral vulcanized molded portion 22 and the inner peripheral vulcanized molded portion 22 shown in FIG. The divided structure is the same as that of each of the outer peripheral side vulcanization molding portions 23, and the entire outer peripheral surface of the inner peripheral side vulcanization molding portion 44 and the annular grooves 46, 47 of the upper and lower mold portions 42, 43 are respectively A concave portion 48 and a convex portion 49 that function to form the convex concave portions 18 and 19 in the air pocket are provided in each half portion on the inner peripheral side vulcanization molded portion 44 side.

  In the vulcanization mold 41, for example, the upper mold portion 42 is moved upward and displaced with respect to the mold clamping posture shown in the figure, and the divided member of the inner peripheral side vulcanization molded portion 44 is radially inward and the outer peripheral side. Since the cavity 50 can be largely opened by displacing the divided members of the vulcanized molded portion 45 radially outward, the proper positioning arrangement of the unvulcanized air in the predetermined position and the product It is possible to always smoothly and easily remove the air bag from the vulcanization mold 41 without damage.

It is a basic-line perspective view which shows embodiment of a vulcanization mold about the principal part. It is an approximate line top view which illustrates the division structure of the inner circumference side mold part. It is radial direction sectional drawing which shows the assembly | attachment state to the rim | limb of product air. It is radial direction sectional drawing which follows the IV-IV line of FIG. It is principal part sectional drawing of the radial direction which shows the action | operation process of a vulcanization mold. It is an approximate line sectional view of the radial direction which illustrates a product air bag. It is a figure which shows other embodiment of a vulcanization mold. It is a half-part schematic sectional drawing of the radial direction which shows other embodiment of a vulcanization mold. It is a half-part schematic sectional drawing of the radial direction which shows other embodiment of a vulcanization mold. It is radial direction sectional drawing about the principal part which shows a prior art.

Explanation of symbols

1, 21, 31, 41 Vulcanization mold 2 Lower mold 3 Upper mold 4, 15, 33, 46, 47 Annular groove 5 Inner peripheral mold part 6 Outer peripheral mold part 7a, 7b Dividing member 8, 16, 26, 37 , 48 Concave part 9, 17, 27, 38, 49 Protruding part 10 Air bladder 11 Rim 12 Tire 12a Bead part 13 Sensor 14, 28, 32, 50 Cavity 18 Convex part 19 Concave part 22 Inner peripheral side vulcanization molding part 23 Outer part Side vulcanization molding parts 24a, 24b, 25a, 25b Split members 34, 43 Lower mold parts 35, 44 Inner peripheral vulcanization molding parts 36, 45 Outer peripheral vulcanization molding part 42 Upper mold part CL Central axis CR Rim contact area CB Bead contact area T Unvulcanized air bladder S Side area

Claims (5)

An air made of an annular hollow body for a safety tire, which is vulcanized and molded in a vulcanization mold, placed inside the tire, assembled to the rim together with the tire, and in surface contact with the rim on the inner peripheral surface Prior to taking out Nou from the vulcanization mold,
The safety tire air that radiates and displaces the contact area of the vulcanization mold, which contributed to the formation of irregularities on the inner peripheral surface of the air bladder, radially inward over the entire circumference. Udon vulcanization method.   The vulcanization of an air bladder for a safety tire according to claim 1, wherein the entire vulcanization mold portion of the inner peripheral surface of the air bladder that contributes to vulcanization molding in the contact area with the rim is displaced radially inward. Method. A vulcanization mold for vulcanizing and molding an air bladder made of an annular hollow body for a safety tire having an uneven portion in a contact area with a rim on an inner peripheral surface in an airtightly partitioned cavity. ,
In contact with the inner peripheral surface of the unvulcanized air bladder, forming an uneven portion there and configuring the inner peripheral side mold portion to vulcanize, with a plurality of circumferentially divided members, A pneumatic tire vulcanization mold for safety tires in which each of these divided members can be displaced inward and outward in the radial direction.   4. The safety tire air according to claim 3, wherein the inner peripheral mold portion is disposed on the inner peripheral surface of the unvulcanized air bladder over the entire portion where the contact area with the rim is formed by vulcanization. Sea urchin mold. Each side part which is located apart from the inner peripheral mold part and is displaced in a direction approaching and separating from each other to form an uneven part on each side of the unvulcanized air bladder and vulcanize The pneumatic tire vulcanization mold for a safety tire according to claim 3 or 4, wherein a mold portion is provided.

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