JP2006116989A - Air bladder for safety tire, and safety tire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air bladder for a safety tire capable of ensuring the normal operation of a tire information transmission body and minimizing the error of measurement even under a severe service environment by adequately realizing a fixing position and a fixing means of the tire information transmission body, and the safety tire having the air bladder. <P>SOLUTION: An air bladder 1 has a hollow annular shape, and is stored in a tire 2 to form a safety tire. When the air bladder 1 is filled with air at the internal pressure set in the relationship to the predetermined pneumatic pressure of the tire 2, a space S<SB>1</SB>and a space S<SB>2</SB>are formed in the tire 2 and the air bladder 1, respectively. On the other hand, when the internal pressure in the space S<SB>1</SB>of the tire 2 is dropped by a flat tire or the like, the air bladder 1 is expanded and deformed to support the load in place of the tire 2. The air bladder 1 comprises an air-impermeable tube 6 and a hoop reinforcing layer 7 to surround the outer circumference of a crown part of the tube 6 over the entire circumferential length, and a tire information transmission body 9 is fixed to the crown part 8. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  This invention is housed in a tire, filled with air at an internal pressure set in relation to a predetermined air pressure of the tire, and forms a space between at least the tire inner surface when the tire internal pressure is normal, The present invention relates to a hollow-cylindrical safety tire air bag for supporting a load from the tire, which is deformed with a decrease in the internal pressure of the tire, and a safety tire having such an air bag, particularly detected by a tire information transmitter. The measurement accuracy of tire information such as pressure and temperature in the internal space is improved.

  Reinforcing members such as a reinforcing tube, reinforcing rubber, and reinforcing belt, or a foam, elastic body, medium, and the like as a safety tire that can travel a certain distance even in a run-flat state in which the tire internal pressure has suddenly decreased due to puncture or the like There are known tires that support the load of the tire on the shoulder, tires that are coated or filled with a sealant agent, block damaged parts such as holes formed in the tire, and prevent a decrease in internal pressure, and the like. In addition, these conventional safety tires have a complicated manufacturing method and are difficult to handle at the time of mounting. Recently, from the viewpoint of reducing the defective rate during manufacturing and improving manufacturing efficiency, In a run-flat state in which the internal pressure of the tire is reduced and the internal pressure of the tire is reduced, a hollow circular air bladder that expands and deforms as the tire internal pressure is lowered and replaces the load from the tire is becoming widespread ( For example, see Patent Document 1).

  Safety tires using such air bladders are supposed to run only up to several tens of kilometers to the nearest service station where the tires can be exchanged for run-flat running. Since the air bag expands and deforms instantaneously and shifts to the run-flat running mode when it decreases, the driver may continue the run-flat running without recognizing any abnormality that has occurred in the tire. However, continuing the run-flat running beyond the above-mentioned distance is extremely dangerous because it causes damage to the tire and eventually leads to destruction. For this reason, such a safety tire needs to include a device that measures tire information such as pressure and temperature in the tire in real time, detects the transition to the run-flat running mode, and transmits this to the driver. In addition, if the tire is used for a long time without replenishing air in the tire, the tire internal pressure naturally decreases.In such a case, if a predetermined pressure difference is exceeded, an abnormality such as puncture occurs. However, it is necessary to detect such a decrease in tire internal pressure and prevent unexpected expansion of the air bladder in advance.

  As such a detection device, it is known to embed a tire information transmitter having a so-called transponder as a typical example in the tire or to adhere to the tire inner surface. However, such tire information transmitters are damaged by the influence of high temperature and high pressure in the vulcanization process at the time of tire manufacture, or the inner surface of the tire due to the influence of vibration from the road surface in a severe use environment that travels on a rough road or the like. There was a case of leaving. In general pneumatic tires that do not contain pneumatic bladders, various means for solving such problems have been proposed. For example, Patent Document 2 has an influence on vibration in a product tire that has been vulcanized. It is described that the tire information transmitter is fixed to a relatively small number of places using metal fittings or rubber bands.

  However, in safety tires having air bladders, it is often impossible to apply the fixing means for the tire information transmitter as it is due to the limitation of the installation space due to the presence of air bladders. Even if it is possible to install, safety tires with air bladders have their internal spaces separated by air bladders, and the circulation of air in the internal spaces is hindered. Therefore, if the tire information transmitter fixing means as described above is applied to a pneumatic safety tire as it is, there will be an error from the actual temperature inside the tire. In some cases, this is a problem in practical use.

JP 2001-10314 A International Publication No. 04/000579 Pamphlet

  Accordingly, an object of the present invention is to ensure the normal operation of the tire information transmitter even in a harsh usage environment and to minimize the measurement error and to prevent the measurement error from occurring. It is providing the safety tire which has.

  In order to achieve the above object, the air bladder for a safety tire according to the present invention is housed in a tire, filled with air at an internal pressure set in relation to a predetermined air pressure of the tire, and the tire internal pressure is normal. In the state, it is a hollow circular safety tire air bag that forms a space between at least the inner surface of the tire, expands and deforms as the internal pressure of the tire decreases, and supports the load from the tire. It comprises an air-impermeable tube and a hoop reinforcing layer that surrounds the entire outer periphery of the crown portion of the tube, and a tire information transmitter is fixed to the crown portion. is there.

  In the present specification, the “predetermined air pressure” is an industrial standard effective in a region where tires are manufactured, sold, or used, such as JATMA, TRA, ETRTO, etc., for safety tires containing reinforced air bladders, It shall be the air pressure specified by the standard and specified according to the load capacity. The “internal pressure set in relation to the predetermined air pressure” means that a space is formed between the outer surface of the reinforcing air bladder and the inner surface of the tire in an air-filled state where the predetermined air pressure is applied to the tire. On the other hand, in the run-flat state where the internal pressure of the tire has decreased, the internal pressure of the reinforcing air bladder expands and deforms as the tire internal pressure decreases, and it can refer to the internal pressure that can replace the load support from the tire. Means an internal pressure larger than a predetermined air pressure, preferably a predetermined air pressure + 50% or less.

  The tire information transmitter is preferably fixed to the outer surface of the hoop reinforcing layer or sandwiched between the tube and the hoop reinforcing layer. As another form of fixing the tire information transmitter, a protective layer wider than the hoop reinforcing layer is further provided on the outer periphery of the air bag hoop reinforcing layer, and tire information is provided between the protective layer and the hoop reinforcing layer. It is also possible to further include a fixture for holding the transmitter, or for the air bag to be in close contact with the outer periphery of the hoop reinforcing layer and extending over the entire circumference, and to fix the tire information transmitter to this fixture.

  Moreover, it is preferable that an adhesive agent or an adhesive tape is affixed on the surface which a tube contacts a hoop reinforcement layer.

  Further, the hoop reinforcing layer is preferably composed of at least two juxtaposed ring-shaped members. In this case, the ring-shaped member may be formed by attaching an adhesive or an adhesive tape to the inner peripheral surface thereof. preferable. Alternatively, the hoop reinforcing layer is preferably configured by spirally winding the ribbon-like member while overlapping the ribbon-like member. In this case, the ribbon-like member is at least an adhesive or a surface on the surface forming the overlap portion. It is preferable to apply an adhesive tape.

  Furthermore, the hoop reinforcing layer is preferably made of resin or cloth.

  And the safety tire according to this invention has any of the above-mentioned air bladders.

  According to this invention, by optimizing the fixing position and fixing means of the tire information transmitter, normal operation of the tire information transmitter can be ensured even in a harsh usage environment, and measurement errors can be minimized. It is possible to provide an air bladder for a safety tire that can be used and a safety tire having such an air bladder.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view in the width direction showing a safety tire containing a typical pneumatic bladder according to the present invention mounted on a rim and filled with a predetermined internal pressure, and FIG. 2 is a typical pneumatic bladder according to the present invention. It is a schematic diagram which shows the state folded in order to insert in a tire.

The air bladder 1 shown in FIG. 1 has a hollow circular tube shape and is housed in a tire 2 to form a safety tire. This safety tire is mounted on the rim 3 to form a tire assembly. The tire 2 is filled with a predetermined air pressure via an air filling valve 4, and the air bladder 1 is filled with air at an internal pressure set in relation to the predetermined air pressure of the tire 2 via an air filling valve 5. Fill. As a result, as shown in FIG. 1, a space S ₁ is formed in the tire 2, and a space S ₂ is formed in the air bladder 1. On the other hand, when the inner pressure of the space S ₁ of the tire 2 by puncture or the like suddenly decreases, as a result of the internal pressure difference between the space S ₁ and the space S ₂ is increased, although not shown, the air bladder 1 is enlarged deformed Finally, the inner surface of the tire 2 is reached, and the load is supported by the shoulder from the tire 2. In addition, although the aspect with which the air filling valve 4 and the air filling valve 5 were formed in the different body was shown in FIG. 1, these valves can also be formed integrally. The tire 2 and the rim 3 are not particularly limited, and various conventionally known structures can be used.

  The main feature of the present invention is that the air bladder 1 includes an air-impermeable tube 6 and a hoop reinforcing layer 7 that surrounds the entire outer periphery of the crown portion of the tube 6. The tire information transmitter 9 is fixed to the crown portion 8.

Hereinafter, how the present invention has adopted the above configuration will be described together with the operation.
In order to transmit the driving limit in the run-flat driving mode due to the occurrence of abnormalities such as puncture in the safety tire and the driving limit in the run-flat driving mode, a tire information transmitter is arranged in the safety tire, It is necessary to measure tire information such as pressure and temperature inside the tire in real time. Conventional methods for fixing such tire information transmitters can be broadly classified into three methods: a method of adhering to the tire inner surface during vulcanization of the tire, a method of adhering to the tire inner surface after vulcanization of the tire, and a method of fixing to the rim. Can do.

  The method of adhering to the tire inner surface at the time of vulcanization of the tire is to apply a vulcanizing adhesive to the tire information transmitter and adhere it by heat at the time of vulcanization. Since the information transmitter is a precision machine, it is prone to failure due to the effects of high temperature and high pressure during vulcanization, and when the failure is found after vulcanization, it is not possible to replace only the tire information transmitter and replace the entire tire. There was a problem that had to be done.

  The method of adhering to the inner surface of the tire after vulcanization of the tire is to adhere the tire information transmitter with an adhesive, and only the tire information transmitter can be easily replaced when a failure occurs. There was a problem that the tire information transmitter was peeled off due to the effect of deposits from the rubber (blooming) and the gas filled in the tire and the temperature rise during running, and the adhesiveness was likely to deteriorate.

  In addition, these methods of bonding to the inner surface of the tire function normally when the tire information transmitter is detached from the bonded position due to an excessive input to the tire tread that occurs in a harsh usage environment traveling on a rough road surface. In extreme cases, it may be damaged by direct influence from external inputs.

  The method of fixing to the rim is that the tire information transmitter is attached when assembling the tire rim, so there is almost no defective rate at the time of manufacture and it can be fixed well even under harsh usage environment, but the air in the inner space of the safety tire Since the circulation of air is hindered by air bubbles, there is a problem that a large temperature difference is likely to occur between the rim side and the crown side, resulting in a large measurement error. In order to promote the circulation of air in the internal space, it is conceivable to provide a raised portion on the outer surface of the air bladder to form a flow passage through which air can flow between the rim side and the crown portion side. The amount of air that can flow to the rim side via the rim side is limited, so there is still a difference of several degrees between the rim side and the crown side. There was also a problem that there was a time delay in the temperature rise.

Thus, all the conventional fixing methods have advantages and disadvantages, and are not suitable for application to safety tires. Accordingly, the inventors have conducted intensive research on the optimization of the fixing position of the tire information transmitter, and obtained the following knowledge. That is, in order to detect an abnormality occurring in safety tire quickly and accurately is to the tire 2 it is necessary to measure the tire information space S _1. Further, to measure the tire information of the space S ₁ is the inner surface of the tire information transmitting member 8 tire 2, or it is considered to adhere to any of the air bladder 1 of the outer surface, the tire as above Since the inner surface of 2 is easily affected by external input, it is better to adhere to the outer surface of the air bladder 1 from the viewpoint of obtaining stable fixation over a long period of time. Further, even on the outer surface of the air bladder 1, the portion facing the sidewall portion of the tire 2 may come into contact with the inner surface of the tire 2 due to the influence of side forces during cornering. May cause damage. On the other hand, since the crown portion 8 of the air bladder 1 hardly comes into contact with the inner surface of the tire 2 in a normal running state, normal operation can be ensured by attaching the tire information transmitter 8 here. .

  The present invention has been completed based on these findings, and according to this, even in a harsh usage environment, peeling and damage of the tire information transmitter can be effectively prevented, and the tire information transmitter is normal. Operation is ensured and the measurement error can be minimized because the tire information in the internal space is directly measured.

  From the viewpoint of reducing external noise, it is advantageous to use a tire information transmitter in which a power supply unit, a sensor unit, a transmitter unit, and the like are integrated into a package. In this case, as shown in FIG. 2, since it is inserted into the tire in a folded state, if the tire information transmitter is too large, it may be difficult to accommodate in the tire or may be damaged by bending of the air bag. From the viewpoint of preventing these, it is advantageous to use a modularized tire information transmitter. In this case, it is not necessary to fix all the modules to the air balloon, at least the sensor module may be fixed to the air balloon, and the other modules may be fixed to the rim or the like.

The tire information transmitter 9 can be fixed to the air bladder 1 in various forms, but when it is required to measure the tire information of the space S ₁ in the tire 2 with extremely high accuracy, as shown in 1, to bond the tire information transmitting member 9 to the outer surface of the hoop reinforcement layer 7, it is advantageous to unobstructed between the tire information transmitting member 9 and the space S ₁ is to be absent. Further, when the tire information transmitter 9 is particularly required to be protected and firmly fixed, it is advantageous to sandwich the tire information transmitter 9 between the tube 6 and the hoop reinforcement layer 7 as shown in FIG. It is.

The air bladder 1 may further include a protective layer 10 wider than the hoop reinforcement layer 7 on the outer periphery of the hoop reinforcement layer 7 as shown in FIG. This is because when the pneumatic tire or the safety tire containing it is transported, it is assumed that it will be subjected to rough handling, so that the provision of the protective layer 10 can prevent the tire information transmitter 9 from being damaged. In this case, the tire information transmitter 9 is preferably sandwiched between the protective layer 10 and the hoop reinforcing layer 7. According to this, at the same time protection and rigid fixation of the tire information transmitting body 9 is obtained, because the tire information in the space S ₁ can be accurately measured. The material of the protective layer 10 is particularly preferably an elastic body such as rubber from the viewpoint of attachment and fixation.

  As another fixing method of the tire information transmitter 9, as shown in FIG. 5, a fixing tool 11 that is in close contact with the hoop reinforcing layer 7 and extends over the entire circumference is disposed on the outer periphery of the hoop reinforcing layer 7. The information transmitter 9 can be fixed. This is advantageous in that the tire information transmitter can be fixed relatively easily and can be easily replaced at the time of failure. As the fixture, a ring-shaped rubber band, rubber tube, resin band, or the like can be used.

  The tube 6 and the hoop reinforcement layer 7 can be bonded by various means. From the viewpoint of maintaining the shape of the air bladder 1 before and after being accommodated in the tire, the tube 6 is in contact with the hoop reinforcement layer 7. It is preferable that an adhesive or an adhesive tape is attached to the surface to be made.

Hoop reinforcement layer 7, during normal running, to suppress the extension of the tube 6 due to expansion of the gas in the space S ₂ due to centrifugal force and temperature rise, while serves to hold the air bladder 1 shape, During run flat running, the tube 6 has such rigidity that it breaks or stretches so as not to prevent the tube 6 from being deformed to expand to the inner surface of the tire 2. As shown in FIG. 1, the hoop reinforcing layer 7 may be composed of a single wide sheet-like member. However, from the viewpoint of facilitating control of the rigidity of the hoop reinforcing layer, a plurality of ring-like members are used. Or it is preferable to comprise with a ribbon-shaped member.

  Specifically, as shown in FIG. 6, the hoop reinforcing layer 7 is preferably composed of at least two juxtaposed ring-shaped members, and in FIG. 6, five juxtaposed ring-shaped members 12. According to this, if the ring-shaped member 12 is processed in advance, it is only necessary to fit the ring-shaped member 12 into the tube 6 in the molding process, so that the molding equipment can be downsized. For example, as shown in FIG. 7, the ring-shaped member 12 has a ribbon-shaped member 13 wound in the radial direction and has an overlap portion for at least one turn. It can comprise by joining members. The bonding here can use an adhesive or ultrasonic heat welding, but is not limited to this. In this case, it is preferable that the ring-shaped member 12 is formed by attaching an adhesive or an adhesive tape to the inner peripheral surface from the viewpoint of simplifying the molding process.

  Alternatively, as shown in FIG. 8, the hoop reinforcing layer 7 is preferably configured by spirally winding the ribbon-like member 14 while overlapping the ribbon-like member 14. According to this, since the hoop reinforcement layer 7 can be molded on the annular hard support or the tube 6, the manufacturing efficiency can be improved, and the attachment position of the hoop reinforcement layer 7 can be stabilized. It is because it can plan. Here, an example of the procedure for winding the ribbon-shaped member 14 in a spiral manner is given. The ribbon-shaped member 14 is first wound on the tube 6 in the circumferential direction, and a part thereof is joined by ultrasonic heat welding or the like. Next, the ribbon-like member and the adjacent ribbon-like member are attached while being wound so as to form an overlap portion 15 of about a half width, and finally the terminal portion is joined by ultrasonic heat welding or the like to reinforce the hoop as shown in FIG. Layer 7 is obtained. In this case, in order to maintain the shape of the hoop reinforcing layer 7, the ribbon-like member 14 is preferably formed by attaching an adhesive or an adhesive tape to at least the surface forming the overlap portion.

  As the adhesive or adhesive tape for adhering the tube 6 and the hoop reinforcing layer 7 as described above, it is preferable to use a material having a relatively high blooming gas durability such as a rubber double-sided tape.

  The hoop reinforcing layer 7 can be made of various materials. However, when the role of maintaining the shape of the air bladder 1 during normal running is particularly important, the hoop reinforcing layer 7 is preferably made of a resin and has high heat resistance. When the resistance to deterioration over time is particularly important, it is preferable to use a cloth. Examples of suitable resins include polypropylene, polyethylene terephthalate, and polycarbonate. Examples of suitable cloths include polyester cloth and nylon cloth.

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, the tire information transmitter 9 has been described by taking an example in which the tire information transmitter 9 is fixed at the approximate center of the air bladder 1, but the fixing position of the tire information transmitter 9 is not limited to this, as shown in FIG. In addition, it may be dispersed and fixed at both ends of the crown portion 8 of the air bladder 1. Further, the number of tire information transmitters 9 is not limited to one, and a plurality of tire information transmitters 9 may be arranged from the viewpoint of fail-safe.

  Next, a safety tire according to the present invention was prototyped and performance evaluation was performed, which will be described below.

  A hoop reinforcing layer having a width of 300 mm was adhered to the outer periphery of the crown portion of the rubber tube having a width of 400 mm, an outer diameter of 800 mm, and an inner diameter of 575 mm in a state of being filled with 70 kPa (relative pressure). This hoop reinforcing layer is formed by spirally winding a polyethylene terephthalate ribbon member having a thickness of 0.3 mm and a width of 40 mm while overlapping each other by 20 mm. Further, an acrylic adhesive tape having a thickness of 0.12 mm and a width of 20 mm was attached to the surface of the ribbon-like member forming the overlap portion in order to bond the ribbon-like members to each other. Furthermore, a rubber protective layer having a thickness of 0.3 mm and a width of 350 mm was further disposed on the outer periphery of the hoop reinforcing layer to constitute an air bladder.

  This pneumatic bladder is accommodated in a tire having a tire size of 495 / 45R22.5, and the safety tires of Examples 1 and 2 and Conventional Examples 1 and 2 are formed. Each of these safety tires has a rim size of 17.00 ×. The tire wheel was mounted on a 22.5 rim. As shown in FIG. 8, in the safety tire of the first embodiment, the tire information transmitter is located at a substantially central position of the crown portion of the air bladder, and in the safety tire of the second embodiment, as shown in FIG. One is attached to each of the left and right ends of the crown portion, and the safety tire of the conventional example 1 is attached to the inner surface of the crown portion of the tire, and the safety tire of the conventional example 2 is mounted on the rim. The tire information transmitter used for these safety tires is composed of three modules, a sensor module 16, a power supply module 17, and a transmission module 18, as shown in FIG.

Each tire wheel is mounted on a test vehicle, the internal pressure of the tire (space S ₁ ) including the reinforcing air bladder is set to 900 kPa (relative pressure), and the internal pressure of the reinforcing air bladder (space S ₂ ) is set to 970 kPa (relative pressure). The drum tester was run under the conditions of a tire load of 56.9 kN and a running speed of 60 km / h.

  In the safety tire of Comparative Example 1, the tire information transmitter peeled off from the inner surface of the tire when the traveling of about 5000 km was finished, and the signal was not transmitted normally. The safety tires of Comparative Example 2 and Examples 1 and 2 were disassembled and confirmed after traveling 50,000 km, and in any safety tire, the tire information transmitter was in the position where it was originally attached.

  Regarding the temperature measured during running, the values of the safety tires of Comparative Example 1 and Examples 1 and 2 were substantially the same, whereas the safety tire of Comparative Example 2 was about 10 compared to these values. A lower value was measured.

  From the above results, the tires of Examples 1 and 2 are excellent in fixing the tire information transmitter while having the same measurement error as the tire of Comparative Example 1, and compared with the tire of Comparative Example 2. It can be seen that the measurement error is small while the tire information transmitter is fixed to the same extent.

  According to the present invention, by optimizing the fixing position and fixing means of the tire information transmitter, normal operation of the tire information transmitter can be ensured even in a harsh usage environment, and measurement errors can be minimized. It has become possible to provide an air bladder for a safety tire and a safety tire having such an air bladder.

1 is a cross-sectional view in the width direction showing a state in which a typical safety tire containing a pneumatic bladder according to the present invention is mounted on a rim and filled with a predetermined internal pressure. It is a schematic diagram which shows the state folded in order to insert the typical air bladder according to this invention in a tire. FIG. 6 is a cross-sectional view in the width direction showing a state in which a safety tire containing another air bladder according to the present invention is mounted on a rim and filled with a predetermined internal pressure. FIG. 6 is a cross-sectional view in the width direction showing a state in which a safety tire containing another air bladder according to the present invention is mounted on a rim and filled with a predetermined internal pressure. FIG. 6 is a cross-sectional view in the width direction showing a state in which a safety tire containing another air bladder according to the present invention is mounted on a rim and filled with a predetermined internal pressure. FIG. 6 is a cross-sectional view in the width direction showing a state in which a safety tire containing another air bladder according to the present invention is mounted on a rim and filled with a predetermined internal pressure. It is a perspective view of the ring-shaped member which comprises the hoop reinforcement layer shown in FIG. FIG. 6 is a cross-sectional view in the width direction showing a state in which a safety tire containing another air bladder according to the present invention is mounted on a rim and filled with a predetermined internal pressure. It is a perspective view of the hoop reinforcement layer which comprises the air bladder shown in FIG. FIG. 6 is a cross-sectional view in the width direction showing a state in which a safety tire containing another air bladder according to the present invention is mounted on a rim and filled with a predetermined internal pressure. 1 is a partially transparent top view of a hoop reinforcing layer of a safety tire of Example 1. FIG.

Explanation of symbols

1 Air bag 2 Tire 3 Rim 4, 5 Air filling valve 6 Tube
7 Hoop Reinforcement Layer 8 Airbag Crown 9 Tire Information Transmitter 10 Protective Layer 11 Fixing Device 12 Ring Member 13, 14 Ribbon Member 15 Overlap Part 16 Sensor Module 17 Power Supply Module 18 Transmission Module

Claims (13)

It is stored in a tire and filled with air at an internal pressure set in relation to a predetermined air pressure of the tire. When the tire internal pressure is normal, a space is formed at least between the tire inner surface and the tire internal pressure. In the air bladder for a hollow circular safety tire that expands and deforms as it falls and replaces the load from the tire,
The air bladder comprises an air-impermeable tube and a hoop reinforcing layer that surrounds the entire outer periphery of the crown portion of the tube, and a tire information transmitter is fixed to the crown portion. Pneumatic bladder for safety tire characterized by.   The safety tire pneumatic bladder according to claim 1, wherein the tire information transmitter is bonded to an outer surface of a hoop reinforcing layer.   The pneumatic tire bladder according to claim 1, wherein the tire information transmitter is sandwiched between a tube and a hoop reinforcing layer.   The air bladder further comprises a protective layer wider than the hoop reinforcing layer on the outer periphery of the hoop reinforcing layer, and the tire information transmitter is sandwiched between the protective layer and the hoop reinforcing layer. Pneumatic bladder for safety tires.   The air bladder for a safety tire according to claim 1, further comprising a fixture that is in close contact with the outer periphery of the hoop reinforcing layer and extends over the entire circumference, and a tire information transmitter is fixed to the fixture. .   The pneumatic tube for a safety tire according to any one of claims 1 to 5, wherein the tube is formed by attaching an adhesive or an adhesive tape to a surface in contact with the hoop reinforcing layer.   The air hoop for a safety tire according to any one of claims 1 to 6, wherein the hoop reinforcing layer includes at least two juxtaposed ring-shaped members.   The air ring for a safety tire according to claim 7, wherein the ring-shaped member is formed by attaching an adhesive or an adhesive tape to an inner peripheral surface thereof.   The air hoop for a safety tire according to any one of claims 1 to 6, wherein the hoop reinforcing layer is formed by spiral winding while overlapping ribbon-like members.   The air ribbon for a safety tire according to claim 9, wherein the ribbon-like member is formed by attaching an adhesive or an adhesive tape to at least a surface forming an overlap portion.   The air hoop for a safety tire according to any one of claims 1 to 10, wherein the hoop reinforcing layer is made of a resin.   The air hoop for safety tires according to any one of claims 1 to 10, wherein the hoop reinforcing layer is made of cloth.   A safety tire having an air bladder according to any one of claims 1 to 12.

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