JP2005324569A - Reinforcing airbag for safety tire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive reinforcing airbag for a safety tire keeping excellent durability even if used for a long period. <P>SOLUTION: The reinforcing airbag 1 shaped in a hollow ring, and stored in a tire 2 to form a safety tire. When the reinforcing airbag 1 is filled with air with inner pressure set from a relationship with predetermined air pressure of the tire 2, spaces S<SB>1</SB>, S<SB>2</SB>are respectively formed in the tire 2 and the reinforcing airbag 1. On the other hand, when the inner pressure of the space S<SB>1</SB>of the tire 2 is lowered due to a blowout and the like, the reinforcing airbag 1 is deformed to increase a diameter, thereby taking over supporting of a load from the tire 2. The reinforcing airbag 1 is equipped with an air impermeable tube 6, and a hoop reinforcing layer 7 surrounding the whole periphery of a crown portion of the tube. On an outer peripheral surface of the tube 6, a movement preventing means 8 for preventing the hoop reinforcing layer 7 from moving in a width direction is provided. <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, With regard to reinforced air bladders for hollow-cylindrical safety tires that expand and deform as the internal pressure of the tire decreases to support the load from the tire, especially the cost of such reinforced air bladders and the improvement of durability Plan.

  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. However, these conventional safety tires often have a high defect rate and a low manufacturing efficiency due to the complicated manufacturing method.

  In order to solve such a problem, for example, in Patent Document 1, in a run-flat state in which the internal pressure of the tire is reduced and the internal pressure of the tire is reduced, the load support is provided from the tire by expanding and deforming as the tire internal pressure decreases. A hollow circular tubular air bag is described as a shoulder. However, in such an air bladder, the air bladder grows radially outward due to the action of centrifugal force generated with the rolling load of the tire, and the outer surface thereof is the inner peripheral surface of the sidewall portion or tread portion, etc. There was a risk of rubbing in contact with the air and eventually damaging the air bladder.

  In Patent Document 2, in addition to the air bladder, at least the crown is constituted by a tension support member to suppress the diameter growth during normal running, and the tension support member expands as the tensile force gradually increases. It is described that the air bladder is uniformly brought into contact with the tire during run-flat running by imparting a physical property showing an elongation-tensile force characteristic in which elongation due to deformation is substantially increased. Further, in Patent Document 3, by attaching a reinforcing layer that is a separate body on the outer periphery of the crown of the air cylinder that forms a hollow ring, the damage of the reinforcing layer is reduced. It is described that the propagation to the sea is suppressed by the boundary layer between them. However, if the air bladder described in Patent Documents 2 and 3 is used for a long period of time, the air force is caused by the centrifugal force accompanying the rolling of the tire or the pressure of the air filled in the air bladder. The rubber part constituting the belly creeps and grows in diameter and eventually reaches the inner surface of the tire, and there is a concern that the hoop reinforcing layer may be rubbed and damaged by the inner surface of the tire. Moreover, since the composite material of a nonwoven fabric and rubber | gum is used as an air bag reinforcement layer of patent document 2 and 3, in order to suppress the diameter growth at the time of normal driving | running | working with such a reinforcement layer, several sheets It was necessary to use a composite, which led to an increase in the cost of safety tires.

  In order to prevent creep deformation of the hoop reinforcement layer, the inventors have conceived that the hoop reinforcement layer is composed of a low-tension material such as a resin. In contrast, since a hoop reinforcing layer made of resin cannot be vulcanized and bonded to a rubber air bladder, a new means for fixing the hoop reinforcing layer to the tube is required. In order to fix the resin to the rubber, it is common to use an adhesive or an adhesive tape, but the gas generated by precipitates (blooming) from the vulcanized rubber constituting the tube and tire, and the temperature rise during running For example, the adhesive or the adhesive tape deteriorates rapidly, so that it is difficult to fix the hoop reinforcing layer to the tube over a long period of time. There are also adhesives suitable for bonding to vulcanized rubber, but such adhesives are very expensive compared to ordinary adhesives, which causes a new cost increase.

JP 2001-10314 A International Publication No. 02/43975 Pamphlet International Publication No. 02/96678 Pamphlet

  Accordingly, an object of the present invention is to provide a safety tire reinforced air bladder having excellent durability even when used for a long period of time at low cost by optimizing the fixing of the hoop reinforcement layer. It is in.

  In order to achieve the above object, 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 at least with the tire inner surface when the internal pressure of the tire is normal In the reinforcing air bladder for a hollow circular safety tire that forms a space between them and expands and deforms with a decrease in the internal pressure of the tire to support the load from the tire, the reinforcing air bladder is A movement comprising an air-impermeable tube and a hoop reinforcing layer surrounding the outer periphery of the crown portion of the tube over the entire circumference, and preventing the hoop reinforcing layer from moving in the width direction on the outer peripheral surface of the tube. A reinforced air bladder for a safety tire, characterized in that a blocking means is provided.

  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.

  Further, the movement preventing means is a pinching protrusion provided on two circumferential lines that respectively pass through the positions of the outer peripheral surfaces of the tube that are in contact with both width edges of the hoop reinforcement layer, or in the vicinity of both width edges of the hoop reinforcement layer. At least two penetrating protrusions that extend in the radial direction of the tube through the hoop reinforcement layer, or both sandwiching protrusions and penetrating protrusions. It is preferable that the two wall portions of the concave portion can accommodate the hoop reinforcing layer formed on the crown portion of the tube. Here, “in the vicinity of both ends of the hoop reinforcing layer” means a region of 2% of the width of the hoop reinforcing layer from the both ends of the hoop reinforcing layer toward the inside in the width direction of the reinforcing air bladder.

  Furthermore, it is preferable that the holding protrusion has a ridge shape extending in the radial direction of the tube, or a hook shape whose tip is bent and extended inward in the width direction of the reinforcing air bladder.

  Furthermore, it is preferable that the hoop reinforcing layer is formed 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. More preferably, an adhesive tape is applied, and the width of the overlap portion is more preferably 15% or more of the width of the ribbon-like member.

  In addition, it is preferable to further provide a wide reinforcing band that surrounds the entire outer peripheral surface of the hoop reinforcing layer. Here, “wide” means having a width of 50% or more of the width of the hoop reinforcing layer.

  According to the present invention, it is possible to provide a reinforced air bladder for a safety tire that has excellent durability even when used for a long period of time at low cost by optimizing the fixing of the hoop reinforcement layer. It becomes.

  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 state in which a safety tire containing a representative reinforced air bladder according to the present invention is mounted on a rim and filled with a predetermined internal pressure.

The reinforced air bladder 1 shown in FIG. 1 has a hollow annular 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. Then, the tire 2 is filled with a predetermined air pressure via the air filling valve 4, and the reinforced air bladder 1 is air-filled with an internal pressure set in relation to the predetermined air pressure of the tire 2 via the air filling valve 5. 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 reinforcing air bladder 1. On the other hand, when the inner pressure of the space S ₁ of the tire 2 is rapidly lowered by puncture or the like, the internal pressure difference between the space S ₁ and the space S ₂ is greater result, although not shown, the reinforcing air bladder 1 is enlarged deformation Finally, the inner surface of the tire 2 is reached, and the load is supported from the tire 2 by shoulder. In addition, although the aspect with which the air filling valve | bulb 4 and the air filling valve | bulb 5 were formed in the separate body was shown in FIG. 1, these valves can also be formed integrally. Moreover, there is no restriction | limiting in particular in the tire 2 and the rim | limb 3, The thing of conventionally well-known various structures can be used.

  The main feature of the present invention is that the reinforcing 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. The movement preventing means 8 for preventing the hoop reinforcing layer 7 from moving in the width direction is provided on the outer peripheral surface of the motor 6.

Hereinafter, how the present invention has adopted the above configuration will be described together with the operation.
The inventors can prevent creep deformation of the hoop reinforcement layer due to a difference in internal pressure between the air bladder and the tire if a hoop reinforcement layer made of a resin is used instead of the conventional hoop reinforcement layer made of a composite of nonwoven fabric and rubber. As a result, the idea of improving the durability of the reinforced air bag was obtained. However, it was found that when the prototype was actually built containing such a reinforced air bag and the durability test was repeated, the expected durability could not be obtained.

  The inventors have conducted extensive research on this cause, and have obtained the following findings. That is, when storing the reinforced air bladder in the tire, it is inserted into the tire in a folded state as shown in FIG. 2, but the center position in the width direction of the hoop reinforcement layer and the tube is shifted during this operation. The hoop reinforcing layer is attached to the tube with an adhesive or an adhesive tape so as not to be present. This adhesive or adhesive tape is used to increase the gas generated by precipitates (blooming) from the vulcanized rubber constituting the tube and tire and the temperature inside the tire during running after the reinforced air bladder is stored in the tire. The hoop reinforcement layer and the tube are eventually separated. In addition, because there are variations in the manufacture of the hoop reinforcing layer and the tube and displacement when the hoop reinforcing layer is attached to the tube, uneven tension may be applied to the hoop reinforcing layer. Furthermore, if the hoop reinforcing layer and the tube are separated, the hoop reinforcing layer may move in the width direction during traveling. For this reason, as a result of applying a large tension locally to the hoop reinforcement layer, creep deformation increases, and the inner surface of the tire rubs against the air bladder, which is the cause of failure to obtain the expected durability. I understood. In addition, in the state where non-uniform tension is applied, when the internal pressure of the tire is reduced, the deflated air bladder cannot be uniformly expanded in diameter, and is expanded to be biased to either the left or right, It has been found that the reinforced air bladder on the side that is biased and expanded during run-flat running may be damaged early, which is not the reason why the expected run-flat durability cannot be obtained.

  In order to prevent such uneven tension distribution, it is conceivable to fix the hoop reinforcement layer to the tube uniformly using a rubber-based double-sided tape that is less deteriorated by blooming gas. Since it is very expensive, there is a problem that it leads to an increase in cost.

  Therefore, the inventors pay attention to the cause of the failure in the movement of the hoop reinforcement layer in the width direction, and instead of attaching the hoop reinforcement layer 7 to the tube 6, the hoop reinforcement layer 7 is formed on the outer peripheral surface of the tube 6. If the movement preventing means 8 is provided to prevent the movement in the width direction, the hoop reinforcing layer 7 is not biased in the width direction even when used for a long time, and the tension is uniformly dispersed. The inventors have found that the durability of No. 1 can be stably obtained, and have completed the present invention.

  As shown in FIG. 1, the movement preventing means 8 includes clamping protrusions 10a and 10b provided on two circumferential lines that respectively pass through the tube outer peripheral surface positions that come into contact with both width end edges 9a and 9b of the hoop reinforcing layer 7. It is preferable that This is because if the movement preventing means 8 is the clamping protrusions 10a and 10b, the hoop reinforcing layer 7 can be attached to the tube 6 relatively easily. The sandwiching protrusions 10a and 10b can be easily formed by processing a mold corresponding to the desired shape and molding the tube 6 with the mold during vulcanization molding.

  The clamping protrusions 10a and 10b are preferably formed in a ridge shape extending in the radial direction of the tube 6, as shown in FIG. Further, from the viewpoint of reliably preventing the hoop reinforcement layer 7 from moving, the sandwiching protrusions 10a and 10b are hook-shaped extending at the tip portion bent inward in the width direction of the reinforcing air bladder 7, as shown in FIG. Is preferable. In any case, the height h of the sandwiching protrusions 10a and 10b is preferably 150 to 500% of the thickness of the hoop reinforcing layer 7.

Further, as shown in FIG. 4, the movement preventing means 8 is provided on two circumferential lines respectively passing through the outer peripheral surface positions of the tubes 6 in the vicinity of both width end edges 9a and 9b of the hoop reinforcing layer 7. It is preferable that there are at least two penetrating protrusions 11 a and 11 b extending through the reinforcing layer 7 in the radial direction of the tube 6. When the hoop reinforcement layer 7 is locked by the through protrusions 11a and 11b in this manner, the accuracy of the positional relationship between the tube 6 and the hoop reinforcement layer 7 in the width direction is improved, and the occurrence of the offset of the hoop reinforcement layer 7 can be prevented. It is. FIG. 5 is an enlarged side view of a part of the tube 6 and the penetrating protrusion 11 with the hoop reinforcing layer 7 removed. As shown in the figure, it is preferable that the penetrating protrusion 11 has an inflating portion 12 having a diameter larger than that of the remaining portion on the radially outer side of the tube. This is because the expanded portion 12 can prevent the hoop reinforcing layer 7 from coming out of the through protrusion 11. Thus, from the viewpoint of effectively preventing the hoop reinforcement layer 7 from coming off, the height h ₁ of the penetrating protrusion 11 to the expansion portion 12 is 105 to 200% of the thickness of the hoop reinforcement layer 7 and the diameter of the expansion portion 12. d ₁ is more preferably a 120 to 150 percent of the diameter _{d 2} of the remaining portion. As a means for attaching the hoop reinforcing layer 7 to the through protrusion 11, for example, a hole, a slit, or a combination thereof is provided in the hoop reinforcing layer 7 in advance, and the through protrusion 11 is fitted to these. At this time, it is preferable to make the diameter of the hole smaller than the diameter d ₁ of the inflating portion 12 and larger than the diameter d ₂ of the remaining portion in order to facilitate fitting and strengthen fixation. The penetrating protrusions 11a and 11b can be easily formed by processing a mold corresponding to a desired shape of the penetrating protrusions 11a and 11b and molding the tube 6 with the mold at the time of vulcanization molding.

  Further, when it is desired to more reliably prevent the movement of the hoop reinforcement layer 7, as shown in FIG. 6, the movement preventing means 8 is a combination of the pinching protrusions 10a and 10b and the penetrating protrusions 11a and 11b. It can also be.

  Alternatively, as shown in FIG. 7, the movement blocking means 8 can be both wall portions 14 a and 14 b of the concave portion 13 that can accommodate the hoop reinforcing layer 7 formed on the crown portion of the tube 6. When the movement preventing means 8 is the both wall portions 14a and 14b of the concave portion 13, the movement preventing means 8 can be easily formed by molding with a mold when the tube 6 is vulcanized. preferable.

  FIGS. 8A to 8C are development views of a part of various reinforced air bladder crowns according to the present invention. As shown in FIG. 8 (a), the movement blocking means 8 may have a continuous shape in the circumferential direction of the reinforcing air bladder 1, but as shown in FIG. 8 (b), the reinforcing air bladder 1 The shape may be discontinuous in the circumferential direction, and in this case, as shown in FIG.

  Further, as shown in FIG. 1, the hoop reinforcing layer 7 may be constituted by a single wide sheet-like member, and although not shown, it may be constituted by at least two juxtaposed ring-shaped members. Although it is good, from the viewpoint of facilitating the control of the rigidity of the hoop reinforcing layer 7, as shown in FIGS. 9A and 9B, the ribbon-like member 15 is overlapped and wound helically. It is preferable to do. In this case, in order to maintain the shape of the hoop reinforcing layer 7, the ribbon-like member 15 is more preferably formed by attaching an adhesive or an adhesive tape to at least the surface forming the overlap portion 16. Since this adhesive or adhesive tape is not intended for adhesion to vulcanized rubber, it can be used even with relatively low blooming gas durability such as acrylic adhesive tape. An increase in cost can be effectively suppressed as compared with a case where a material having a relatively high blooming gas durability such as a tape is used. Of course, it is also possible to use a relatively high blooming gas durability such as a rubber-based double-sided tape.

Furthermore, the width w ₁ of the overlap portion 16 is preferably 15% or more of the width w ₂ of the ribbon-like member 15. This is because when the width w ₁ of the overlap portion 16 is less than 15% of the width w ₂ of the ribbon-like member 15, the adhesive force between the ribbon-like members 15 is insufficient and may be peeled off.

  FIGS. 10A to 10C are enlarged cross-sectional views of a part of the hoop reinforcing layer 7. The adhesive or adhesive tape 17 may be applied over substantially the entire ribbon-like member 15 as shown in FIG. 10 (a), but is applied over substantially the entire overlap portion 16 as shown in FIG. 10 (b). May be attached. Further, when the width of the overlap portion 16 is large, or when the adhesive force of the adhesive or the adhesive tape 17 is large, as shown in FIG. An adhesive tape 17 may be attached.

  In addition, as shown in FIG. 11, it is preferable to further provide a wide reinforcing band 18 that surrounds the entire outer peripheral surface of the hoop reinforcing layer 7. This is because the hoop reinforcement layer 7 is more firmly fixed to the tube 6 and the movement of the hoop reinforcement layer 7 in the width direction is more reliably prevented. The material of the reinforcing band 18 is particularly preferably an elastic body such as rubber from the viewpoint of attachment and fixation. The width of the reinforcing band 18 is particularly preferably substantially the same as the width of the hoop reinforcing layer 7.

  In addition, the place mentioned above only showed a part of embodiment of this invention, and can change a various change in a claim.

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

(Example 1)
The reinforced air bladder of Example 1 is a reinforced air bladder for safety tires having a tire size of 495 / 45R22.5, and has the structure shown in FIG. 1 and is made of butyl rubber having a thickness of 3.5 mm. The outer periphery of the crown portion of the tube is surrounded by the hoop reinforcement layer over the entire circumference, and the height is set on two circumferential lines respectively passing through the positions of the tube outer peripheral surfaces contacting the both edges of the hoop reinforcement layer. A pair of ridge-shaped sandwiching protrusions having a continuous shape in the circumferential direction as shown in FIG. The hoop reinforcing layer is made of polyethylene terephthalate having a thickness of 1.3 mm, and is composed of one ring-shaped member having a width of 300 mm, and is in close contact with the tube in a non-joined state. The tube has a width of 400 mm, an outer diameter of 800 mm, and an inner diameter of 575 mm.

(Example 2)
The reinforced air bladder of Example 2 is a reinforced air bladder for safety tires having a tire size of 495 / 45R22.5. The outer periphery of the crown portion of the same tube as that of Example 1 is surrounded by a hoop reinforcing layer over the entire circumference. The height is 2 mm and the tip is bent 5 mm inward in the width direction of the reinforced air bag on the two circumferential lines that pass through the tube outer peripheral surface positions that are in contact with both width edges of the hoop reinforcing layer. It is provided with a hook-like pinching protrusion that extends in the manner described above. Further, in the reinforced air bladder of Example 2, the hoop reinforcing layer is suspended while overlapping a ribbon-like member made of polyethylene terephthalate having a thickness of 0.3 mm and a width of 40 mm in the same manner as in FIG. 9B. It has the same structure as the reinforced air bag shown in FIG. 3 except that the overlapped part formed by winding the spiral is bonded with an acrylic adhesive tape having a width of 20 mm and a thickness of 0.12 mm.

(Example 3)
The reinforced air bladder of Example 3 is a reinforced air bladder for safety tires having a tire size of 495 / 45R22.5, and the outer periphery of the crown portion of the same tube as in Example 1 is surrounded by a hoop reinforcing layer over the entire circumference. In addition, penetrating protrusions that penetrate the hoop reinforcing layer and extend in the radial direction of the tube are provided on two circumferential lines that respectively pass through the tube outer peripheral surface positions of 20 mm from both width edges of the hoop reinforcing layer. The penetrating protrusion has a diameter of the expansion portion of 7 mm, the diameter of the remaining portion is 5 mm, the height to the expansion portion is 1 mm, and eight pieces are spaced apart at equal intervals on one circumferential line. Is provided. The reinforcing air bladder of Example 3 was formed in the same manner as in Example 2 except that a hoop reinforcing layer having a 6 mm diameter hole formed at a position corresponding to the penetrating protrusion was used. It has the same structure as the reinforced air bag shown in FIG.

Example 4
The reinforced air bladder of Example 4 is a reinforced air bladder for safety tires having a tire size of 495 / 45R22.5, and the outer periphery of the crown portion of the same tube as that of Example 1 is surrounded by a hoop reinforcing layer over the entire circumference. 6 having the same hook-like pinching protrusion as in Example 2 and the same through protrusion as in Example 3 and using the same hoop reinforcing layer as in Example 3 It has a similar structure.

(Example 5)
The reinforced air bladder of Example 5 is a reinforced air bladder for a safety tire having a tire size of 495 / 45R22.5, and the outer periphery of the crown portion of the same tube as that of Example 1 is surrounded by a hoop reinforcing layer over the entire circumference. And has the same ridge-shaped clamping protrusion as in the first embodiment. Further, the same hoop reinforcing layer as that of Example 2 was used, and the entire outer peripheral surface was surrounded by a rubber reinforcing band having a thickness of 1.5 mm and a width of 300 mm, and the same structure as the reinforcing air bag shown in FIG. It was.

(Comparative example)
For comparison, the tire size is 495 / 45R22.5 reinforced air bag for safety tires, and the outer periphery of the crown of the same tube as in Examples 1 to 5 is surrounded by the same hoop reinforcing layer as in Example 1 over the entire circumference. However, as shown in FIG. 12, there is no movement preventing means, and instead, a reinforced air bag formed by bonding the tube and the hoop reinforcing layer with an acrylic adhesive tape having a thickness of 0.12 mm ( A conventional example was also made.

Each test reinforcing air bladder was accommodated in a tire having a tire size of 495 / 45R22.5, and mounted on a rim having a rim size of 17.00 × 22.5 to form a tire wheel. The tire wheel is mounted on a test vehicle, the internal pressure of the tire (space S ₁ ) including the reinforced air bladder is set to 900 kPa (relative pressure), and the internal pressure of the reinforced air bladder (space S ₂ ) is 970 kPa (relative pressure). And a tire load of 49 kN was applied, and the drum testing machine was run for 30,000 km under the condition of a running speed of 60 km / h.

  When the appearance of the tire wheel was visually observed after the 30,000 km run, no change was seen in the tire wheel using the reinforced air bladder of Examples 1 to 5, but the reinforced air bladder of the comparative example was used. In the tire wheels, the shape of the sidewalls was asymmetrical on the left and right. Therefore, when a CT scan was performed on the tire wheel using the reinforced air bladder of the comparative example, it was found that the reinforced air bladder was in a bulging state, and only one side was in contact with the inner surface of the tire. It was. Furthermore, when the tire wheel was disassembled and the reinforced air bladder was taken out and observed, the reinforced air bladder of Examples 1 to 5 showed no movement of the hoop reinforcement layer and no damage to the tube. In the example reinforcing air bladder, the hoop reinforcing layer moved about 30 mm in the width direction, and a part of the tube was worn by contact with the tire inner surface. Therefore, it can be seen that the reinforced air bags of Examples 1 to 5 are superior in durability to the reinforced air bag of Comparative Example 1.

  By optimizing the fixing of the hoop reinforcement layer according to the present invention, it has become possible to provide a reinforced air bladder for a safety tire having excellent durability even when used for a long time at low cost. .

FIG. 3 is a cross-sectional view in the width direction showing a safety tire containing a representative reinforced air bladder according to the present invention mounted on a rim and filled with a predetermined internal pressure. The reinforced air bladder according to this invention is shown in a folded state for insertion into a tire. FIG. 5 is a cross-sectional view in the width direction showing a safety tire containing another reinforced air bladder according to the present invention mounted on a rim and filled with a predetermined internal pressure. FIG. 5 is a cross-sectional view in the width direction showing a safety tire containing another reinforced air bladder according to the present invention mounted on a rim and filled with a predetermined internal pressure. It is an expanded sectional view of a penetration projection. FIG. 5 is a cross-sectional view in the width direction showing a safety tire containing another reinforced air bladder according to the present invention mounted on a rim and filled with a predetermined internal pressure. FIG. 5 is a cross-sectional view in the width direction showing a safety tire containing another reinforced air bladder according to the present invention mounted on a rim and filled with a predetermined internal pressure. It is a development view of a part of various crown portions of the reinforced air bag according to the present invention. (A) is the width direction sectional view shown in the state where the safety tire which stored other reinforced air bladder according to this invention was attached to the rim, and was filled up with predetermined internal pressure, (b) is shown in (a) It is a perspective view of a hoop reinforcement layer. (A)-(c) is an expanded sectional view of a part of hoop reinforcement layer. FIG. 5 is a cross-sectional view in the width direction showing a safety tire containing another reinforced air bladder according to the present invention mounted on a rim and filled with a predetermined internal pressure. It is a cross-sectional view in the width direction shown in a state where a safety tire containing a reinforced air bladder of a comparative example is mounted on a rim and filled with a predetermined internal pressure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Reinforcement air bladder 2 Tire 3 Rim 4, 5 Air filling valve 6 Tube 7 Hoop reinforcement layer 8 Movement prevention means 9a, 9b Hoop reinforcement layer edge 10a, 10b Nipping protrusion 11, 11a, 11b Through protrusion 12 Expansion part 13 Concave shape Part 14a, 14b Both wall part 15 Ribbon-like member 16 Overlap part 17 Adhesive tape 18 Reinforcement band

Claims (10)

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 a reinforced air bag for a hollow circular safety tire that expands and deforms as it falls and replaces the load from the tire,
The reinforcing 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,
A safety tire reinforcing air bladder is provided with a movement preventing means for preventing the hoop reinforcing layer from moving in the width direction on the outer peripheral surface of the tube.   2. The reinforcing air bladder according to claim 1, wherein the movement preventing means is a pinching protrusion provided on two circumferential lines that respectively pass through positions of the outer peripheral surface of the tube that are in contact with both width edges of the hoop reinforcing layer.   3. The reinforcing air bladder according to claim 2, wherein the sandwiching protrusion has a ridge shape extending in the radial direction of the tube, or a hook shape having a tip portion bent and extended inward in the width direction of the reinforcing air bladder.   The movement preventing means is provided on two circumferential lines respectively passing through the tube outer peripheral surface positions in the vicinity of both width edges of the hoop reinforcing layer, and passes through the hoop reinforcing layer and extends in the radial direction of the tube. The reinforced air bladder according to claim 1, which is a through-projection.   The movement preventing means includes a pinching projection provided on two circumferential lines passing through positions of the outer peripheral surface of the tube that are in contact with both width edges of the hoop reinforcing layer, and a tube outer periphery in the vicinity of both width edges of the hoop reinforcing layer. The reinforced air bladder according to claim 1, which is provided on two circumferential lines respectively passing through the surface positions, and is at least two penetrating protrusions extending through the hoop reinforcing layer and extending in the radial direction of the tube. .   The reinforced air bladder according to claim 1, wherein the movement preventing means is both wall portions of a concave portion that can accommodate a hoop reinforcing layer formed on a crown portion of the tube.   The said hoop reinforcement layer is a reinforcement air bag as described in any one of Claims 1-6 comprised by making a spiral spiral winding, making a ribbon-shaped member overlap.   The reinforcing air bladder according to claim 7, 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 reinforced air bladder according to claim 7 or 8, wherein a width of the overlap portion is 15% or more of a width of the ribbon-shaped member.   The reinforced air bladder according to any one of claims 1 to 9, further comprising a wide reinforcing band surrounding the entire outer peripheral surface of the hoop reinforcing layer.

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